style(提交详情): 答错时的例子对比换成新样子，三格横排、不一样的那行两边标浅黄

- 和题目页结果页签同一套：黄色小节标题「例子 N 没对上」、正文大小的说明、输入灰 / 正确输出绿 / 学生的输出红
- 这一页一栏 1200 宽，三格横着并排，正确输出和学生的输出一行对一行，不一样的那行两边都垫浅黄
- 窄于 600（手机、课堂任务的弹窗）自动退回竖排

Co-Authored-By: Claude Opus 5.5 <noreply@anthropic.com>

.gitea/workflows/deploy.yml

@@ -0,0 +1,152 @@
+# push 到 origin（git.xuyue.cc）的 main 就部署：在开发机上编好产物 → rsync 到服务器 →
+# 服务器上跑 docker/deploy.sh --prebuilt 起栈。
+#
+# 跑在哪：开发机上的 gitea-runner（host 模式，标签 oj2-deploy），不在服务器上。
+#   - 服务器只有 2 核，编一次要 5 分钟左右、光前端就 160 秒，编的时候判题会排队。
+#   - 原来在 GitHub 上编，海外 → 服务器晚高峰只有十几 KB/s，rsync 一次要五六分钟；
+#     开发机 → 服务器实测 5MB 约 1 秒。
+#   代价：**push 时开发机得开着。** 没开的话任务在 Gitea 里排队，开机后 runner 连上就接着跑。
+#   runner 的装法和配置见 docs/deploy.md「部署 runner」。
+#
+# host 模式直接用开发机自己的东西：PATH 里的 bun、~/.ssh/config 里的 `debian`（root@服务器）
+# 和 git.xuyue.cc 的 SSH 访问。所以这里**不需要配任何 secret**，也不用 actions/checkout
+# （它要去 GitHub 拉 action，在国内反而是最慢的一步）。
+#
+# 有了 .gitea/workflows 之后，Gitea 不再读 .github/workflows；GitHub 那份改成了只能手动
+# 触发的备用路线（开发机不在时用），push 不会在两边各部署一次。
+name: Deploy
+
+on:
+  push:
+    branches:
+      - main
+  # 手动触发时可以放行破坏性迁移。push 触发拿不到这个 input，值恒为空 ——
+  # 也就是说**自动部署永远不会执行 DROP TABLE 之类的迁移**，只会停在闸门上把
+  # 工作流判红。这是有意的：那种改动得有人先确认备份。
+  workflow_dispatch:
+    inputs:
+      allow_destructive:
+        description: "放行破坏性迁移（DROP TABLE / DROP COLUMN / ALTER TYPE …）。勾之前先确认已备份数据库。"
+        type: boolean
+        default: false
+
+# 两次 push 挨得近时，别让两个 deploy.sh 在服务器上同时起栈。
+# runner 的 capacity 也是 1，这里再保一道。
+concurrency:
+  group: deploy
+  cancel-in-progress: false
+
+env:
+  REMOTE: debian # 开发机 ~/.ssh/config 里的主机名
+  REMOTE_DIR: /root/OJDeploy/OJ2
+
+jobs:
+  deploy:
+    runs-on: oj2-deploy
+    timeout-minutes: 20
+    steps:
+      # 工作目录可能是上一次留下的，所以 fetch 之后强制切过去再清掉没跟踪的文件
+      # （node_modules 留着，bun install 会对齐它）。
+      - name: 取代码
+        env:
+          SHA: ${{ gitea.sha }}
+          REPO: ${{ gitea.repository }}
+        run: |
+          git init -q .
+          git fetch -q --depth 1 "git@git.xuyue.cc:$REPO.git" "$SHA"
+          git checkout -q --force FETCH_HEAD
+          git clean -ffdxq -e node_modules
+          git log --oneline -1
+
+      # 单二进制把运行时一起打进去：这里用的 bun 是哪个，线上跑的就是哪个。
+      #
+      # ⚠️ **不能用开发机 PATH 里的 bun。** pacman 装的 bun 是 Arch 自己编的，动态链接系统的
+      # ICU（libicui18n.so.78），编出来的 oj2-api 到容器里就报找不到这个库 —— 2026-11-03
+      # 第一次跑就撞上了，好在迁移那步先炸、容器没动。官方发布的 bun 自带 ICU，
+      # 只依赖 libc，和 GitHub 上 setup-bun 装的是同一个东西。
+      #
+      # 所以这里按 packageManager 的版本下载官方二进制（核 sha256），缓存在
+      # ~/.cache/oj2-deploy/ 下，同一个版本只下一次；再把它放到 PATH 最前面，
+      # 后面的 bun install / bunx 都走它。
+      - name: 装 bun
+        run: |
+          ver=$(sed -nE 's/.*"packageManager": *"bun@([^"]+)".*/\1/p' package.json)
+          [ -n "$ver" ] || { echo "::error::package.json 里读不到 packageManager 的 bun 版本"; exit 1; }
+          dir="$HOME/.cache/oj2-deploy/bun-v$ver"
+          if [ ! -x "$dir/bun" ]; then
+            tmp=$(mktemp -d)
+            base="https://github.com/oven-sh/bun/releases/download/bun-v$ver"
+            curl -fsSL --retry 3 -o "$tmp/bun-linux-x64.zip" "$base/bun-linux-x64.zip"
+            curl -fsSL --retry 3 -o "$tmp/SHASUMS256.txt" "$base/SHASUMS256.txt"
+            (cd "$tmp" && grep ' bun-linux-x64.zip$' SHASUMS256.txt | sha256sum -c -)
+            unzip -q "$tmp/bun-linux-x64.zip" -d "$tmp"
+            mkdir -p "$dir"
+            install -m755 "$tmp/bun-linux-x64/bun" "$dir/bun"
+            rm -rf "$tmp"
+          fi
+          [ "$("$dir/bun" --version)" = "$ver" ] || { echo "::error::$dir/bun 的版本不是 $ver"; exit 1; }
+          echo "$dir" >> "$GITHUB_PATH"
+          echo "用 $dir/bun（$ver）"
+
+      - name: 装依赖
+        run: bun install --frozen-lockfile
+
+      # 输出到 dist/oj2-api，正是 Dockerfile 里 artifacts-prebuilt 阶段要的位置。
+      # 编完先看它链接了什么：官方 bun 编出来的只依赖 libc 那几个，多出任何一个库
+      # （比如 libicu）都说明用错了 bun，到容器里一定起不来。在这里拦下，
+      # 别等服务器上构建完镜像、迁移时才炸 —— 那时 oj2-api:latest 已经被换成坏镜像了。
+      - name: 编后端
+        run: |
+          bun run --filter '@oj2/api' build
+          ldd dist/oj2-api
+          extra=$(ldd dist/oj2-api | awk '{print $1}' | grep -vE '^(linux-vdso\.so\.1|libc\.so\.6|libpthread\.so\.0|libdl\.so\.2|libm\.so\.6|/lib64/ld-linux-x86-64\.so\.2)$' || true)
+          [ -z "$extra" ] || { echo "::error::dist/oj2-api 多链接了这些库，容器里没有：$extra"; exit 1; }
+
+      # 默认 production 模式，读 apps/web/.env.production（在版本库里）。
+      - name: 编前端
+        run: cd apps/web && bun run build
+
+      # 格式、lint、前后端类型检查、路由遮蔽、AST 节点，有一项不过就不部署。
+      # 必须排在「编前端」之后：前端类型检查要 unplugin 生成的 auto-imports.d.ts /
+      # components.d.ts，它们不进版本库，vite build 时才生成。
+      - name: 检查
+        run: bunx vp run verify
+
+      # 排除项和 --no-owner --no-group 的理由见 .github/workflows/deploy.yml 同名一步，
+      # 一条都不能少（少了 data 就是删库，少了 docker/.env* 下一步自检直接 die）。
+      #   -c               按内容比：每次 checkout 出来的 mtime 都是「刚才」，按 mtime 比会把
+      #                    600 多个没改的文件逐个走一遍增量。
+      #   --delay-updates  全部传完才一起换上去，中途断了服务器上不会留下半新半旧的源码。
+      #   --timeout        60 秒没有数据进出就算断了，交给循环重试，半截文件接着用。
+      - name: 同步到服务器
+        timeout-minutes: 10
+        run: |
+          for attempt in 1 2 3; do
+            rsync -a -c --no-owner --no-group --delete-delay --delay-updates \
+              --compress --compress-choice=zstd \
+              --timeout=60 --stats --human-readable \
+              -e "ssh -o BatchMode=yes -o ServerAliveInterval=15 -o ServerAliveCountMax=4" \
+              --exclude node_modules \
+              --exclude .git \
+              --exclude data \
+              --exclude 'docker/.env*' \
+              ./ "$REMOTE:$REMOTE_DIR/" && exit 0
+            echo "::warning::rsync 第 $attempt 次没传完，10 秒后重试"
+            sleep 10
+          done
+          exit 1
+
+      # deploy.sh 自检不过 / 迁移被拦 / 容器没起来 / 冒烟发现题目数是 0，都会非零退出。
+      # 破坏性迁移会被拦下并退出 4，除非手动触发时勾了 allow_destructive。
+      #
+      # 放行与否在 shell 里按字符串 "true" 判：Gitea 的 inputs 是布尔还是字符串，
+      # "false" 这个非空字符串都不会被当成放行（GitHub 那份踩过 github.event.inputs 的坑）。
+      - name: 起栈
+        env:
+          ALLOW_INPUT: ${{ inputs.allow_destructive }}
+        run: |
+          allow=''
+          [ "$ALLOW_INPUT" = "true" ] && allow=1
+          echo "放行破坏性迁移：${allow:-否}"
+          ssh -o BatchMode=yes -o ServerAliveInterval=15 -o ServerAliveCountMax=8 "$REMOTE" \
+            "cd $REMOTE_DIR && OJ2_ALLOW_DESTRUCTIVE='$allow' docker/deploy.sh --prebuilt"

.github/workflows/deploy.yml

@@ -1,19 +1,20 @@
-# 在 runner 上编好产物 → rsync 到服务器 → 服务器上跑 docker/deploy.sh 起栈。
+# 备用部署路线：**只能手动触发**（Actions 页面 → Deploy → Run workflow）。
+# 平时的部署是 push origin 时由开发机上的 gitea-runner 跑 .gitea/workflows/deploy.yml，
+# 这份只在开发机不在、又急着上线时用。
 #
-# 为什么产物在这里编：服务器性能差，镜像 builder 阶段（1238 个包的 bun install +
-# bun compile + vite build）首次约 5 分钟，光前端就 160s。runner 编完传过去，
-# 服务器那边的镜像构建只剩几条 COPY。
+# 为什么不再 push 就跑：GitHub 的 runner 在海外，到服务器晚高峰只有十几 KB/s，
+# rsync 一次要五六分钟（后端改一行，--bytecode 那段约 6MB 字节码就整段重写，增量省不掉）。
+# 而 origin 会镜像到 github，两边都 push 触发的话每次会部署两遍，两边的并发锁又不通。
+#
+# 流程：在 runner 上编好产物 → rsync 到服务器 → 服务器上跑 docker/deploy.sh 起栈。
+# 产物不在服务器上编，是因为服务器性能差，镜像 builder 阶段（1238 个包的 bun install +
+# bun compile + vite build）首次约 5 分钟，光前端就 160s。
 #
 # 服务器自己编的能力**没有砍掉**：docker/deploy.sh 不带 --prebuilt 就是原来的
-# 行为（ARTIFACTS=build），只要机器上有 docker 就能手动部署，不依赖这个工作流。
+# 行为（ARTIFACTS=build），只要机器上有 docker 就能手动部署，不依赖任何工作流。
 #
-# 触发的是 push 到 **github** 这个 remote：
-#
-#   git push github main
-#
-# origin（git.xuyue.cc）是 Gitea，仓库里没有 .gitea/workflows 时它的 Actions 会退回来
-# 读这份 .github/workflows，每次 push origin 都会把部署再跑一遍 —— 那边不需要。
-# 所以下面 job 上卡了 server_url：只在 GitHub 上跑，Gitea 上直接跳过。
+# job 上卡了 server_url：只在 GitHub 上跑。仓库有了 .gitea/workflows 之后 Gitea 本来就
+# 不再读这份，这道闸留着防万一。
 #
 # 仓库 Settings → Secrets 需要两个：
 #   HOST  服务器地址
@@ -21,12 +22,8 @@
 name: Deploy
 
 on:
-  push:
-    branches:
-      - main
-  # 手动触发时可以放行破坏性迁移。push 触发拿不到这个 input，值恒为空 ——
-  # 也就是说**自动部署永远不会执行 DROP TABLE 之类的迁移**，只会停在闸门上把
-  # 工作流判红。这是有意的：那种改动得有人先确认备份。
+  # 手动触发时可以放行破坏性迁移；不勾就停在闸门上把工作流判红。
+  # 那种改动得有人先确认备份。
   workflow_dispatch:
     inputs:
       allow_destructive:
@@ -97,9 +94,21 @@ jobs:
           chmod 600 ~/.ssh/id_deploy
           ssh-keyscan -p "$REMOTE_PORT" -H "${{ secrets.HOST }}" >> ~/.ssh/known_hosts 2>/dev/null
 
-      # 源码和产物一起传。dist/oj2-api 有 77MB，但 rsync 对已存在的文件做增量，
+      # 源码和产物一起传。dist/oj2-api 有 115MB，但 rsync 对已存在的文件做增量，
       # 重编后大部分（bun 运行时那段）字节不变，实际传输量远小于这个数。
       #
+      # 慢在线路上：runner 在海外，到服务器晚高峰只有十几 KB/s，传 3~4MB 就要五六分钟。
+      # 后端只要改了一行，--bytecode 那段字节码（约 6MB）就整段重写、增量也省不掉，
+      # 它占了每次传输量的七成多。下面几个开关都是为了少传、传不动时别干等：
+      #   -c            按内容比，不看 mtime。checkout 出来每个文件的 mtime 都是「刚才」，
+      #                 不加它 rsync 会把 600 多个没改的源码逐个走一遍增量、来回交换校验块。
+      #   zstd 19       比默认的 zlib 再少传约 17%（实测 4.09MB → 3.38MB），压缩只花 runner 的 CPU。
+      #   --delay-updates  全部传完才一次性换上去，中途断了服务器上不会留下半新半旧的源码。
+      #   --timeout     60 秒没有任何数据进出就算断了，交给外面的循环重试；
+      #                 重试时 --delay-updates 留在 .~tmp~ 里的半截文件会接着用，不从头传。
+      #   ServerAlive   连接悄悄死掉时 ssh 自己能发现，不会一直挂着。
+      #   --stats       日志里能看到这次到底传了多少字节。
+      #
       # --delete 的排除项少一个就会出事，逐条说明：
       #   docker/.env  服务器上唯一一份，不在版本库里（.gitignore 排掉了 .env*）。
       #                删了下一步 deploy.sh 自检就直接 die。
@@ -114,14 +123,22 @@ jobs:
       # 还是当初手动 clone 时的 root。两者对不上，之后在服务器上跑任何 git 命令都会被
       # 「检测到可疑的仓库所有权」挡下（git 2.35.2 起的 safe.directory 检查）。
       - name: 同步到服务器
+        timeout-minutes: 20
         run: |
-          rsync -az --no-owner --no-group --delete \
-            -e "ssh -i ~/.ssh/id_deploy -p $REMOTE_PORT" \
-            --exclude node_modules \
-            --exclude .git \
-            --exclude data \
-            --exclude 'docker/.env*' \
-            ./ "root@${{ secrets.HOST }}:$REMOTE_DIR/"
+          for attempt in 1 2 3; do
+            rsync -a -c --no-owner --no-group --delete-delay --delay-updates \
+              --compress --compress-choice=zstd --compress-level=19 \
+              --timeout=60 --stats --human-readable \
+              -e "ssh -i ~/.ssh/id_deploy -p $REMOTE_PORT -o ServerAliveInterval=15 -o ServerAliveCountMax=4" \
+              --exclude node_modules \
+              --exclude .git \
+              --exclude data \
+              --exclude 'docker/.env*' \
+              ./ "root@${{ secrets.HOST }}:$REMOTE_DIR/" && exit 0
+            echo "::warning::rsync 第 $attempt 次没传完，10 秒后重试"
+            sleep 10
+          done
+          exit 1
 
       # deploy.sh 自检不过 / 迁移被拦 / 容器没起来 / 冒烟发现题目数是 0，都会非零退出，
       # 这一步跟着红，日志里能看到具体是哪一条。

CLAUDE.md

@@ -62,7 +62,8 @@ cd apps/web && bun run build                  # 前端构建（不在 verify 里
 配置都只在根目录的 `vite.config.ts` 一份：`fmt` 块（Oxfmt 的写法，`bun fmt` 直接读它；
 `semi: false`、`singleQuote: true`、`printWidth: 160`）、`lint` 块（Oxlint，`denyWarnings`）、`run.tasks`
 （`verify` 和它依赖的四个检查）。**别用 `vp fmt` / `vp check`**：Oxfmt 和 `bun fmt` 只在
-长 CSS 值列表的折行上不一样，混着跑会把 `apps/web/public/style.css` 来回改。前端自己的构建
+长 CSS 值列表的折行上不一样，混着跑会把 `apps/web/public/style.css`、`apps/web/src/oj/learn/learn.css` 来回改
+（`vp fmt --list-different` 能列出当前受影响的文件）。前端自己的构建
 配置在 `apps/web/vite.config.ts`，和根目录那份无关。
 
 - 格式化只管代码：`.md` / `.yml` / `.json` / `.toml` 在 `fmt.ignorePatterns` 里排掉了
@@ -85,9 +86,9 @@ references 的壳，真正的配置在 `tsconfig.app.json`），而 `vite build`
 
 ## 提交
 
-**直接在 `main` 上干活，不开特性分支。** 注意 push 到 `github` 这个 remote 的 `main`
-会触发 CI 部署；而 `origin` 会镜像到 `github`，**平时 push `origin` 通常几秒后也就部署了**
-（偶尔不跟，要 `git ls-remote github` 核实）。见 `docs/deploy.md`。
+**直接在 `main` 上干活，不开特性分支。** 注意 **push `origin` 的 `main` 就会部署**：
+开发机上的 gitea-runner 跑 `.gitea/workflows/deploy.yml`，进度在 git.xuyue.cc 的 Actions 页面。
+GitHub 那份只剩手动触发的备用路线。见 `docs/deploy.md`。
 
 提交信息用中文，格式 `type(范围): 从用户视角描述现象`，例如
 `fix(流程图): 「重新判题」从来没成功过，而且会把原来的评分清掉`。

apps/api/src/db/0043_mascot_event.sql

@@ -0,0 +1,14 @@
+CREATE TABLE "mascot_event" (
+	"id" integer PRIMARY KEY GENERATED BY DEFAULT AS IDENTITY (sequence name "mascot_event_id_seq" INCREMENT BY 1 MINVALUE 1 MAXVALUE 2147483647 START WITH 1 CACHE 1),
+	"user_id" integer NOT NULL,
+	"kind" text NOT NULL,
+	"situation" text,
+	"line" text,
+	"action" text,
+	"path" text NOT NULL,
+	"created_at" timestamp with time zone DEFAULT now() NOT NULL
+);
+--> statement-breakpoint
+ALTER TABLE "mascot_event" ADD CONSTRAINT "mascot_event_user_id_fk_user_id" FOREIGN KEY ("user_id") REFERENCES "public"."user"("id") ON DELETE cascade ON UPDATE no action;--> statement-breakpoint
+CREATE INDEX "mascot_event_user_kind_idx" ON "mascot_event" USING btree ("user_id","kind");--> statement-breakpoint
+CREATE INDEX "mascot_event_created_at_idx" ON "mascot_event" USING btree ("created_at");

apps/api/src/db/0044_achievement_more_tiers.sql

@@ -0,0 +1,184 @@
+-- 成就惠及更多学生（2026-11-03）。已经拿到的一个不收回。
+--
+-- 这学期 375 个交过题的学生，成就数中位数 5 个、三分之一只有 0–2 个。三件事：
+--
+-- 1. 比赛里的提交也算成就（判题结算同步改了，见 services/achievements.ts 的 solvedCounts）。
+--    这里的比赛其实是单班测验，2612 班整个班都在比赛里做题，人均做对 17 道却一个成就也没有；
+--    「参加过几场比赛」以前判题时也不更新，只在后台重扫时刷新，所以连「初入赛场」都没拿到。
+-- 2. 几条线补上低一档（10 道和 50 道之间、一次就对 1 次和 20 次之间……），外加一条新线
+--    「挑战成功」。括号里是这学期学生已经达到的比例。
+-- 3. 档多了，「奖杯收藏家」从 15 个提到 20 个，不然人人都有。
+--
+-- 然后从提交记录把含比赛的指标重数一遍，按新配置给所有达标的人补发（backfilled，不显示日期）。
+-- 编译错误次数和按天的连续不重数：前者上线前的历史本来就没有，后者已经下架。
+
+INSERT INTO "achievement" ("name", "description", "icon", "rarity", "hidden", "metric", "operator", "threshold", "visible", "unlock_count", "order", "create_time") VALUES
+  ('稳扎稳打', '通过 20 道题目', 'noto:orange-book', 'bronze', false, 'accepted_count', 'gte', 20, true, 0, 2, now()),          -- 44%
+  ('初露锋芒', '通过 1 道中等难度题目', 'noto:sunrise-over-mountains', 'bronze', false, 'mid_ac_count', 'gte', 1, true, 0, 6, now()), -- 21%
+  ('迎难而上', '挑战成功 1 次', 'noto:puzzle-piece', 'bronze', false, 'challenge_count', 'gte', 1, true, 0, 10, now()),      -- 60%
+  ('精益求精', '挑战成功 5 次', 'noto:gem-stone', 'silver', false, 'challenge_count', 'gte', 5, true, 0, 10, now()),         -- 12%
+  ('勤学苦练', '累计提交 30 次', 'noto:pencil', 'bronze', false, 'submission_count', 'gte', 30, true, 0, 11, now()),         -- 48%
+  ('渐成习惯', '累计 5 天有提交记录', 'noto:spiral-calendar', 'bronze', false, 'active_days', 'gte', 5, true, 0, 15, now()), -- 59%
+  ('手感火热', '累计 5 次首次提交即通过', 'noto:glowing-star', 'bronze', true, 'first_try_ac_count', 'gte', 5, true, 0, 25, now()), -- 67%
+  ('再试一次', '同一道题失败 3 次后终于通过', 'noto:counterclockwise-arrows-button', 'bronze', true, 'max_wa_before_ac', 'gte', 3, true, 0, 32, now()), -- 54%
+  ('一鼓作气', '一天之内通过 5 道题', 'noto:dashing-away', 'bronze', true, 'max_ac_in_one_day', 'gte', 5, true, 0, 34, now()); -- 57%
+--> statement-breakpoint
+UPDATE "achievement" SET "threshold" = 20, "description" = '解锁 20 个成就（不含白金）'
+WHERE "metric" = 'achievement_unlocked_count' AND "threshold" = 15;
+--> statement-breakpoint
+-- 交过题、还没有 user_stat 的人先建一行（2612 班大多是这样：比赛提交以前根本不进结算）
+INSERT INTO "user_stat" ("user_id", "metrics", "update_time")
+SELECT DISTINCT s."user_id", '{}'::jsonb, now()
+FROM "submission" s
+JOIN "user" u ON u."id" = s."user_id"
+ON CONFLICT ("user_id") DO NOTHING;
+--> statement-breakpoint
+-- 按判题结算的口径从提交记录重数（services/achievements.ts）：含比赛；在判的（6/7）不算，
+-- 它们判完时结算会自己加；做对 = ACCEPTED(0) / AST_CHECK_FAILED(10)；日历按东八区。
+-- 「新做对」= 这道题第一次做对的那条提交。
+UPDATE "user_stat" AS target
+SET "metrics" = target."metrics" || fresh.metrics, "update_time" = now()
+FROM (
+  WITH subs AS (
+    SELECT s."id", s."user_id", s."problem_id", s."contest_id", s."result", s."language", s."code", s."create_time",
+      (s."create_time" AT TIME ZONE 'Asia/Shanghai') AS local, p."difficulty",
+      s."result" IN (0, 10) AS ac,
+      -- 这道题在这条之前交过几次（同一时刻的不算「之前」，和结算里的 create_time < 一致）
+      rank() OVER (PARTITION BY s."user_id", s."problem_id" ORDER BY s."create_time") - 1 AS before
+    FROM "submission" s
+    JOIN "user" u ON u."id" = s."user_id"
+    JOIN "problem" p ON p."id" = s."problem_id"
+    WHERE s."result" NOT IN (6, 7)
+  ),
+  totals AS (
+    SELECT "user_id",
+      count(DISTINCT "problem_id") FILTER (WHERE ac)::int AS accepted,
+      count(DISTINCT "problem_id") FILTER (WHERE ac AND "difficulty" = 'Mid')::int AS mid,
+      count(DISTINCT "problem_id") FILTER (WHERE ac AND "difficulty" = 'High')::int AS hard,
+      count(*)::int AS submissions,
+      count(DISTINCT "contest_id")::int AS contests,
+      count(*) FILTER (WHERE extract(hour FROM local) < 5)::int AS midnight,
+      count(*) FILTER (WHERE extract(hour FROM local) >= 5 AND extract(hour FROM local) < 7)::int AS early,
+      jsonb_agg(DISTINCT "language") AS languages,
+      jsonb_agg(DISTINCT to_char(local, 'YYYY-MM-DD')) AS dates
+    FROM subs GROUP BY "user_id"
+  ),
+  first_try AS (
+    SELECT "user_id", count(*) FILTER (WHERE ac)::int AS n
+    FROM (SELECT DISTINCT ON ("user_id", "problem_id") "user_id", ac FROM subs ORDER BY "user_id", "problem_id", "create_time", "id") f
+    GROUP BY "user_id"
+  ),
+  code_lines AS (
+    SELECT "user_id", max((
+      SELECT count(*) FROM regexp_split_to_table("code", E'\n') AS line WHERE btrim(line, E' \t\r') <> ''
+    ))::int AS n
+    FROM subs WHERE ac GROUP BY "user_id"
+  ),
+  first_ac AS (
+    SELECT DISTINCT ON ("user_id", "problem_id") "user_id", "problem_id", local, before
+    FROM subs WHERE ac ORDER BY "user_id", "problem_id", "create_time", "id"
+  ),
+  wa_before AS (
+    SELECT "user_id", max(before)::int AS n FROM first_ac GROUP BY "user_id"
+  ),
+  per_day AS (
+    SELECT "user_id", jsonb_object_agg(day, n) AS days, max(n)::int AS best
+    FROM (SELECT "user_id", to_char(local, 'YYYY-MM-DD') AS day, count(*)::int AS n FROM first_ac GROUP BY 1, 2) d
+    GROUP BY "user_id"
+  ),
+  weeks AS (
+    SELECT DISTINCT "user_id", date_trunc('week', local)::date AS w FROM first_ac
+  ),
+  runs AS (
+    SELECT "user_id", count(*)::int AS len, max(w) AS last_w
+    FROM (SELECT "user_id", w, w - (row_number() OVER (PARTITION BY "user_id" ORDER BY w))::int * 7 AS g FROM weeks) i
+    GROUP BY "user_id", g
+  ),
+  streak AS (
+    SELECT "user_id", max(len) AS best, (array_agg(len ORDER BY last_w DESC))[1] AS current, max(last_w) AS last_w
+    FROM runs GROUP BY "user_id"
+  ),
+  challenges AS (
+    SELECT "user_id", count(*)::int AS n FROM "challenge_success" GROUP BY "user_id"
+  )
+  SELECT t."user_id",
+    jsonb_build_object(
+      'accepted_count', t.accepted,
+      'mid_ac_count', t.mid,
+      'hard_ac_count', t.hard,
+      'first_try_ac_count', coalesce(ft.n, 0),
+      'submission_count', t.submissions,
+      'contest_joined', t.contests,
+      'midnight_submissions', t.midnight,
+      'early_bird_submissions', t.early,
+      '_languages', t.languages,
+      'languages_used', jsonb_array_length(t.languages),
+      '_active_dates', t.dates,
+      'active_days', jsonb_array_length(t.dates),
+      'max_code_lines', coalesce(cl.n, 0),
+      'max_wa_before_ac', coalesce(wb.n, 0),
+      '_ac_per_day', coalesce(pd.days, '{}'::jsonb),
+      'max_ac_in_one_day', coalesce(pd.best, 0),
+      'challenge_count', coalesce(ch.n, 0)
+    ) || CASE WHEN st."user_id" IS NULL THEN '{}'::jsonb ELSE jsonb_build_object(
+      'max_ac_week_streak', st.best,
+      '_current_ac_week_streak', st.current,
+      '_last_ac_week', to_char(st.last_w, 'YYYY-MM-DD')
+    ) END AS metrics
+  FROM totals t
+  LEFT JOIN first_try ft ON ft."user_id" = t."user_id"
+  LEFT JOIN code_lines cl ON cl."user_id" = t."user_id"
+  LEFT JOIN wa_before wb ON wb."user_id" = t."user_id"
+  LEFT JOIN per_day pd ON pd."user_id" = t."user_id"
+  LEFT JOIN streak st ON st."user_id" = t."user_id"
+  LEFT JOIN challenges ch ON ch."user_id" = t."user_id"
+) fresh
+WHERE target."user_id" = fresh."user_id";
+--> statement-breakpoint
+-- 挑战成功了、却一条提交都没有的（不会有，保险）也给个数
+UPDATE "user_stat" AS target
+SET "metrics" = jsonb_set(target."metrics", '{challenge_count}', to_jsonb(c.n))
+FROM (SELECT "user_id", count(*)::int AS n FROM "challenge_success" GROUP BY "user_id") c
+WHERE target."user_id" = c."user_id" AND (target."metrics" -> 'challenge_count') IS DISTINCT FROM to_jsonb(c.n);
+--> statement-breakpoint
+-- 补发：上架的、非元成就，达标没发的都发（口径同 rescanAchievement：backfilled、待通知）
+INSERT INTO "user_achievement" ("user_id", "achievement_id", "unlock_time", "backfilled", "notified")
+SELECT st."user_id", a."id", now(), true, false
+FROM "user_stat" st
+JOIN "achievement" a ON a."visible" AND a."metric" <> 'achievement_unlocked_count'
+WHERE jsonb_typeof(st."metrics" -> a."metric") = 'number'
+  AND CASE WHEN a."operator" = 'gte' THEN (st."metrics" ->> a."metric")::numeric >= a."threshold"
+           ELSE (st."metrics" ->> a."metric")::numeric <= a."threshold" END
+ON CONFLICT ("user_id", "achievement_id") DO NOTHING;
+--> statement-breakpoint
+-- 已解锁数（上架的非白金）重数，口径同 refreshUnlockedCount
+UPDATE "user_stat" AS target
+SET "metrics" = jsonb_set(target."metrics", '{achievement_unlocked_count}', to_jsonb(fresh.value))
+FROM (
+  SELECT s."id", coalesce(c.value, 0) AS value
+  FROM "user_stat" s
+  LEFT JOIN (
+    SELECT ua."user_id", count(*)::int AS value
+    FROM "user_achievement" ua
+    JOIN "achievement" a ON a."id" = ua."achievement_id"
+    WHERE a."rarity" <> 'platinum' AND a."visible"
+    GROUP BY ua."user_id"
+  ) c ON c."user_id" = s."user_id"
+) fresh
+WHERE target."id" = fresh."id"
+  AND (target."metrics" -> 'achievement_unlocked_count') IS DISTINCT FROM to_jsonb(fresh.value);
+--> statement-breakpoint
+-- 第二轮：元成就（奖杯收藏家）
+INSERT INTO "user_achievement" ("user_id", "achievement_id", "unlock_time", "backfilled", "notified")
+SELECT st."user_id", a."id", now(), true, false
+FROM "user_stat" st
+JOIN "achievement" a ON a."visible" AND a."metric" = 'achievement_unlocked_count'
+WHERE jsonb_typeof(st."metrics" -> a."metric") = 'number'
+  AND CASE WHEN a."operator" = 'gte' THEN (st."metrics" ->> a."metric")::numeric >= a."threshold"
+           ELSE (st."metrics" ->> a."metric")::numeric <= a."threshold" END
+ON CONFLICT ("user_id", "achievement_id") DO NOTHING;
+--> statement-breakpoint
+UPDATE "achievement" AS a
+SET "unlock_count" = coalesce(c.n, 0)
+FROM (SELECT "achievement_id", count(*)::int AS n FROM "user_achievement" GROUP BY "achievement_id") c
+WHERE c."achievement_id" = a."id" AND a."unlock_count" IS DISTINCT FROM c.n;

apps/api/src/db/meta/_journal.json

@@ -302,6 +302,20 @@
       "when": 1793632543220,
       "tag": "0042_class_name_cleanup",
       "breakpoints": true
+    },
+    {
+      "idx": 43,
+      "version": "7",
+      "when": 1793693911394,
+      "tag": "0043_mascot_event",
+      "breakpoints": true
+    },
+    {
+      "idx": 44,
+      "version": "7",
+      "when": 1793695621303,
+      "tag": "0044_achievement_more_tiers",
+      "breakpoints": true
     }
   ]
 }

apps/api/src/db/schema.ts

@@ -46,6 +46,7 @@ import type {
   JudgeStatus,
   LessonLanguage,
   LessonMode,
+  MascotEventKind,
   ProblemChallenges,
   ProblemDifficulty,
   ProblemLanguage,
@@ -1411,3 +1412,45 @@ export const challengeSuccess = pgTable(
     }).onDelete('cascade'),
   ],
 )
+
+/**
+ * 看板娘的互动记录：点开气泡、点气泡里的按钮、她主动开口、摸头彩蛋、被拖走（种类见契约
+ * mascotEventSchema）。拿来看她说的话、给的按钮学生用不用，以后按学生的行为调整她也读这里；
+ * 「点过几次」（熟悉程度）直接按 user_id 数 open。
+ *
+ * 不是「学生做过什么」的证据，账号没了就没意义，user 外键 CASCADE（外键分档见 CLAUDE.md「数据库」）。
+ */
+export const mascotEvent = pgTable(
+  'mascot_event',
+  {
+    id: integer().primaryKey().generatedByDefaultAsIdentity({
+      name: 'mascot_event_id_seq',
+      startWith: 1,
+      increment: 1,
+      minValue: 1,
+      maxValue: 2147483647,
+      cache: 1,
+    }),
+    userId: integer('user_id').notNull(),
+    kind: text().$type<MascotEventKind>().notNull(),
+    situation: text(),
+    line: text(),
+    action: text(),
+    path: text().notNull(),
+    createdAt: timestamp('created_at', {
+      withTimezone: true,
+      mode: 'string',
+    })
+      .notNull()
+      .defaultNow(),
+  },
+  (table) => [
+    index('mascot_event_user_kind_idx').on(table.userId, table.kind),
+    index('mascot_event_created_at_idx').on(table.createdAt),
+    foreignKey({
+      columns: [table.userId],
+      foreignColumns: [user.id],
+      name: 'mascot_event_user_id_fk_user_id',
+    }).onDelete('cascade'),
+  ],
+)

apps/api/src/index.ts

@@ -21,6 +21,7 @@ import { problemRoutes } from './routes/problem'
 import { problemStatsRoutes } from './routes/problem-stats'
 import { submissionRoutes } from './routes/submission'
 import { trialRunRoutes } from './routes/trial-run'
+import { mascotRoutes } from './routes/mascot'
 import { siteRoutes } from './routes/site'
 import { scanPendingChallenges } from './services/challenge'
 import { bridgeSubmissionEvents, isAllowedWebSocketOrigin, startSessionSweep, submissionWebSocketHandler, type SubmissionSocketData } from './websocket'
@@ -44,6 +45,7 @@ app.route('/api', problemRoutes)
 app.route('/api', problemStatsRoutes)
 app.route('/api', submissionRoutes)
 app.route('/api', trialRunRoutes)
+app.route('/api', mascotRoutes)
 app.route('/api/admin', adminRoutes)
 
 // 没有这条的话，打错的接口地址回的是 Hono 默认的纯文本「404 Not Found」，前端 utils/api.ts 读不出

apps/api/src/judge/ast.ts

@@ -63,15 +63,74 @@ async function loadLanguage(language: string) {
   return loaded
 }
 
-function collectNodes(root: Node, type: string, result: Node[] = []) {
-  if (root.type === type) result.push(root)
-  for (const child of root.children) collectNodes(child, type, result)
+type Match = (node: Node) => boolean
+
+function collectNodes(root: Node, match: Match, result: Node[] = []) {
+  if (match(root)) result.push(root)
+  for (const child of root.children) collectNodes(child, match, result)
   return result
 }
 
-function hasNode(root: Node, type: string): boolean {
-  if (root.type === type) return true
-  return root.children.some((child) => hasNode(child, type))
+function hasNode(root: Node, match: Match): boolean {
+  if (match(root)) return true
+  return root.children.some((child) => hasNode(child, match))
+}
+
+const ofType =
+  (type: string): Match =>
+  (node) =>
+    node.type === type
+
+/** C / C++ 函数定义的函数名：`int *f()` 的名字在 pointer_declarator 里面一层，沿着 declarator 往里找 */
+function functionName(definition: Node) {
+  let declarator = definition.childForFieldName('declarator')
+  while (declarator && declarator.type !== 'function_declarator') declarator = declarator.childForFieldName('declarator')
+  return declarator?.childForFieldName('declarator')?.text
+}
+
+/**
+ * 语法 target 认哪些节点。多数就是比节点类型，例外：
+ *
+ * C / C++ 的「函数定义」不算 `main` —— 每个 C 程序都有 main，算进去的话「必须使用函数定义」
+ * 永远通过、「不能使用」永远失败，老师选它要的是「自己写了函数」。所以 C 那边叫「自定义函数」。
+ *
+ * Python 的「赋值语句」连 `s += 1` 一起算 —— 和 C 一个口径（C 的 assignment_expression
+ * 本来就包括 `+=`），学生也是这么理解的。tree-sitter-python 里 `+=` 是单独的 augmented_assignment。
+ */
+function nodeMatch(target: string, language: string): Match {
+  const type = astTargetNodeType(target, language)
+  if (target === 'function_definition' && language !== 'Python') {
+    return (node) => node.type === type && functionName(node) !== 'main'
+  }
+  if (target === 'assignment' && language === 'Python') {
+    return (node) => node.type === type || node.type === 'augmented_assignment'
+  }
+  return ofType(type)
+}
+
+/**
+ * 运算符只认真在做运算的那一个 token。光比 token 的话，下面这些全都算「用了」：
+ * C 的 `scanf("%d", &n)` 算 `&`、`int *p` 算 `*`，C++ 的 `vector<int>` 算 `>`，
+ * Python 的 `*args` / `from m import *` 算 `*`、`**kw` 算 `**`、`not in` / `is not` 算 `not`、
+ * `case 1 | 2` 算 `|`。所以看它的父节点：二元运算、复合赋值、自增自减。
+ *
+ * 一元的只认取反（`!x` / `not x`）。负号 `-x` 不算「用了减号」，同理 `*p` 不算乘、`&n` 不算按位与。
+ */
+const OPERATOR_PARENTS: Record<string, string[]> = {
+  C: ['binary_expression', 'assignment_expression', 'update_expression'],
+  'C++': ['binary_expression', 'assignment_expression', 'update_expression'],
+  Python: ['binary_operator', 'boolean_operator', 'comparison_operator', 'augmented_assignment'],
+}
+const NOT_PARENTS: Record<string, string[]> = {
+  C: ['unary_expression'],
+  'C++': ['unary_expression'],
+  Python: ['not_operator'],
+}
+
+function operatorMatch(target: string, language: string): Match {
+  const type = astTargetNodeType(target, language)
+  const parents = (target === 'not' ? NOT_PARENTS : OPERATOR_PARENTS)[language] ?? []
+  return (node) => node.type === type && node.parent !== null && parents.includes(node.parent.type)
 }
 
 function targetName(rule: AstRule, language?: string) {
@@ -201,6 +260,10 @@ export function astRulesError(astRules: AstRules | null): string | null {
         if (!rule.keyword?.trim()) return `${at}：参数名不能为空`
       }
       if (!astRuleIsMeaningful(rule)) return `${at}：次数检查至少要填一个数字`
+      if ([rule.exact, rule.min, rule.max].some((n) => n !== undefined && n < 0)) return `${at}：次数不能是负数`
+      if (rule.min !== undefined && rule.max !== undefined && rule.min > rule.max) {
+        return `${at}：至少 ${rule.min} 次比至多 ${rule.max} 次还多，怎么写都过不了`
+      }
     }
   }
   return null
@@ -238,12 +301,32 @@ const CALL_NODE_TYPES: Record<string, string> = {
   Python: 'call',
 }
 
+/** `import math` / `import numpy as np` 引进来的模块名。`import os.path` 绑定的是 `os` */
+function importedModules(root: Node) {
+  const names = new Set<string>()
+  for (const statement of collectNodes(root, ofType('import_statement'))) {
+    for (const item of statement.namedChildren) {
+      const name = item.type === 'aliased_import' ? item.childForFieldName('alias') : item.type === 'dotted_name' ? item.namedChildren[0] : null
+      if (name) names.add(name.text)
+    }
+  }
+  return names
+}
+
 function functionCalls(root: Node, target: string, language: string) {
   const callType = CALL_NODE_TYPES[language] ?? 'call'
-  return collectNodes(root, callType).filter((call) => {
+  // Python 的 `math.sqrt(4)` 也算调用了 sqrt() —— 和 `from math import sqrt` 后写 `sqrt(4)`
+  // 是一回事，老师配「必须调用 sqrt()」时想的就是它。只认 import 进来的模块，
+  // `s.count()` 这种对象上的方法还是归「调用方法」
+  const modules = language === 'Python' ? importedModules(root) : null
+  return collectNodes(root, ofType(callType)).filter((call) => {
     const fn = call.childForFieldName('function')
     if (!fn) return false
     if (fn.type === 'identifier') return fn.text === target
+    if (modules && fn.type === 'attribute') {
+      const object = fn.childForFieldName('object')
+      return object?.type === 'identifier' && modules.has(object.text) && fn.childForFieldName('attribute')?.text === target
+    }
     // `std::sort(...)` 是 qualified_identifier。学生写 sort 还是 std::sort 取决于
     // 有没有 using namespace std，两种都得认，所以末段也比一次
     if (language === 'C++' && fn.type === 'qualified_identifier') {
@@ -265,13 +348,13 @@ function methodCalls(root: Node, target: string, language: string) {
   // 和 Python 的 attribute 不是一回事 —— 少了这个分支，C++ 的「必须调用 .push_back()」
   // 会静默地永远失败
   if (language === 'C++') {
-    return collectNodes(root, 'call_expression').filter((call) => {
+    return collectNodes(root, ofType('call_expression')).filter((call) => {
       const fn = call.childForFieldName('function')
       return fn?.type === 'field_expression' && fn.childForFieldName('field')?.text === target
     })
   }
   if (language !== 'Python') return []
-  return collectNodes(root, 'call').filter((call) => {
+  return collectNodes(root, ofType('call')).filter((call) => {
     const fn = call.childForFieldName('function')
     return fn?.type === 'attribute' && fn.childForFieldName('attribute')?.text === target
   })
@@ -279,20 +362,20 @@ function methodCalls(root: Node, target: string, language: string) {
 
 function evaluateRule(root: Node, rule: AstRule, language: string): AstResult | null {
   const target = rule.target ?? ''
-  const nodeType = astTargetNodeType(target, language)
+  const match = rule.engine === 'must_use_operator' ? operatorMatch(target, language) : nodeMatch(target, language)
 
   switch (rule.engine) {
     case 'must_exist_node':
       return {
         description: describeAstRule(rule, language),
-        passed: hasNode(root, nodeType),
+        passed: hasNode(root, match),
       }
     case 'must_not_exist_node': {
-      const nodes = collectNodes(root, nodeType)
+      const nodes = collectNodes(root, match)
       return withLines({ description: describeAstRule(rule, language), passed: nodes.length === 0 }, nodes)
     }
     case 'count_node': {
-      const nodes = collectNodes(root, nodeType)
+      const nodes = collectNodes(root, match)
       return withLines(
         {
           description: describeAstRule(rule, language),
@@ -335,7 +418,7 @@ function evaluateRule(root: Node, rule: AstRule, language: string): AstResult |
     case 'must_use_operator':
       return {
         description: describeAstRule(rule, language),
-        passed: hasNode(root, nodeType),
+        passed: hasNode(root, match),
       }
     case 'must_use_keyword':
       return {
@@ -345,9 +428,8 @@ function evaluateRule(root: Node, rule: AstRule, language: string): AstResult |
     case 'must_have_nesting': {
       const outer = rule.outer ?? ''
       const inner = rule.inner ?? ''
-      const outerType = astTargetNodeType(outer, language)
-      const innerType = astTargetNodeType(inner, language)
-      const passed = collectNodes(root, outerType).some((node) => node.children.some((child) => hasNode(child, innerType)))
+      const innerMatch = nodeMatch(inner, language)
+      const passed = collectNodes(root, nodeMatch(outer, language)).some((node) => node.children.some((child) => hasNode(child, innerMatch)))
       return { description: describeAstRule(rule, language), passed }
     }
     default:

apps/api/src/routes/admin/lesson.ts

@@ -1,4 +1,4 @@
-import { adminLessonRequestSchema, STUDENT_ROLES, type AdminLessonList, type AdminLessonRequest } from '@oj2/contract'
+import { adminLessonRequestSchema, lessonModeSchema, STUDENT_ROLES, type AdminLessonList, type AdminLessonRequest } from '@oj2/contract'
 import { and, count, desc, eq, inArray, sql } from 'drizzle-orm'
 import { Hono } from 'hono'
 
@@ -24,7 +24,12 @@ adminLessonRoutes.get('/lessons', requireTeacher, async (c) => {
   const offset = queryInteger(c.req.query('offset'), 0, { min: 0 })
   const className = c.req.query('className')?.trim()
   const teacherId = queryInteger(c.req.query('teacher'), 0, { min: 0 })
-  const where = and(className ? eq(schema.classLesson.className, className) : undefined, teacherId ? eq(schema.classLesson.createdBy, teacherId) : undefined)
+  const mode = lessonModeSchema.safeParse(c.req.query('mode')).data
+  const where = and(
+    className ? eq(schema.classLesson.className, className) : undefined,
+    teacherId ? eq(schema.classLesson.createdBy, teacherId) : undefined,
+    mode ? eq(schema.classLesson.mode, mode) : undefined,
+  )
 
   const [rows, [totalRow], teachers] = await Promise.all([
     db
@@ -156,10 +161,14 @@ adminLessonRoutes.put('/lessons/:id', requireTeacher, async (c) => {
   // 班级能改：原来那个班和新的班学生看到的都可能变，两边各比一次
   const classes = await affectedClasses(id, result.values.className)
   const before = await Promise.all(classes.map((className) => todayLessonSnapshot(className)))
+  // 时刻只填到分：没改时刻就留着原来带秒的那个。不然只改了做什么，这一节也被挪到这一分钟的开头，
+  // 排到同一分钟里后布置的那节前面去 —— 「今天最后一节」就换了人（先画流程图、紧接着再开一节写代码，常在同一分钟里）
+  const [current] = await db.select({ createdAt: schema.classLesson.createdAt }).from(schema.classLesson).where(eq(schema.classLesson.id, id))
+  const sameMinute = current && Math.floor(Date.parse(current.createdAt) / 60_000) * 60_000 === Date.parse(result.values.createdAt)
   // 布置的老师不换，和任务页上「改」一样认第一次
   const [row] = await db
     .update(schema.classLesson)
-    .set({ ...result.values, updatedAt: new Date().toISOString() })
+    .set({ ...result.values, createdAt: sameMinute ? current.createdAt : result.values.createdAt, updatedAt: new Date().toISOString() })
     .where(eq(schema.classLesson.id, id))
     .returning({ id: schema.classLesson.id })
   if (!row) return failure(c, 404, 'lesson-not-found', '这一节已经被删掉了')

apps/api/src/routes/home.ts

@@ -1,5 +1,5 @@
-import { type ClassActivity, type ClassActivityProblem, type LastVisit, type LessonLanguage, type LessonMode, lessonNeeds } from '@oj2/contract'
-import { and, asc, desc, eq, gte, inArray, isNull, lt, sql } from 'drizzle-orm'
+import { type ClassActivity, type ClassActivityProblem, type LastVisit } from '@oj2/contract'
+import { and, asc, eq, gte, inArray, isNull, lt, sql } from 'drizzle-orm'
 import { Hono } from 'hono'
 
 import { requireAuth, type AppEnv } from '../auth/middleware'
@@ -9,7 +9,6 @@ import { success } from '../http'
 import { FLOWCHART_PASSED, lessonLanguageFilter, SOLVED_RESULTS } from '../services/class-activity'
 import { accepted } from '../services/learning-stats'
 import { CLASS_ACTIVITY_LOOKBACK_DAYS, classLessonProblems } from '../services/lesson'
-import { calendarDay } from '../time'
 
 /**
  * 首页上和「这节课」有关的两张卡：学生的「上次来」和「班里在做」。
@@ -145,7 +144,7 @@ homeRoutes.get('/me/class-activity', requireAuth, async (c) => {
 
   const lesson = await classLessonProblems(user.className, CLASS_ACTIVITY_LOOKBACK_DAYS)
   const ids = lesson.problems.map((problem) => problem.id)
-  const steps = lesson.source === 'teacher' && lesson.mode ? await todaySteps(user.className, ids, lesson) : null
+  const steps = lesson.steps
   const codeLanguage = steps ? steps.language : lesson.language
   // 代码提交和流程图提交两张表，互不依赖，一起查
   const [mine, drawn] = await Promise.all([
@@ -193,7 +192,7 @@ homeRoutes.get('/me/class-activity', requireAuth, async (c) => {
     problems: lesson.problems.map((problem) => {
       const code = stepOf(codeById.get(problem.id))
       const draw = stepOf(drawById.get(problem.id))
-      const needs = steps?.needs.get(problem.id)
+      const needs = steps?.needsOf(problem.id)
       let myStatus: Step
       if (needs) {
         // 老师布置的：要哪几步就看哪几步，全做到才算做完
@@ -215,39 +214,3 @@ homeRoutes.get('/me/class-activity', requireAuth, async (c) => {
     }),
   } satisfies ClassActivity)
 })
-
-/**
- * 学生那边一道题要画还是要写：今天这个班布置过的每一节里，凡是有这道题的，要求合起来算。
- * 老师先布置一节画流程图、再布置一节同样的题写代码时，还没画完的人照样看得到要画 ——
- * 学生只看得到今天最后布置的那一节，不合起来的话，画流程图那节一布置写代码就没了。
- *
- * 写代码用的语言：今天最后布置的、要写代码的那一节选的（只画流程图的课没有语言）
- */
-async function todaySteps(
-  className: string,
-  problemIds: number[],
-  latest: { lessonId: number | null; language: LessonLanguage | null; mode: LessonMode | null },
-) {
-  const rows = await db
-    .select({ id: schema.classLesson.id, problemIds: schema.classLesson.problemIds, language: schema.classLesson.language, mode: schema.classLesson.mode })
-    .from(schema.classLesson)
-    .where(and(eq(schema.classLesson.className, className), eq(schema.classLesson.day, calendarDay())))
-    .orderBy(desc(schema.classLesson.createdAt), desc(schema.classLesson.id))
-  const needs = new Map<number, { draw: boolean; code: boolean }>()
-  let language: LessonLanguage | null = latest.mode && lessonNeeds(latest.mode).code ? latest.language : null
-  let languageFound = !!latest.mode && lessonNeeds(latest.mode).code
-  for (const row of rows) {
-    const shared = row.id === latest.lessonId ? problemIds : row.problemIds.filter((id) => problemIds.includes(id))
-    if (!shared.length) continue
-    const rowNeeds = lessonNeeds(row.mode)
-    for (const id of shared) {
-      const known = needs.get(id) ?? { draw: false, code: false }
-      needs.set(id, { draw: known.draw || rowNeeds.draw, code: known.code || rowNeeds.code })
-    }
-    if (!languageFound && rowNeeds.code) {
-      language = row.language ?? null
-      languageFound = true
-    }
-  }
-  return { needs, language }
-}

apps/api/src/routes/mascot.ts

@@ -0,0 +1,176 @@
+import { mascotEventSchema, type MascotProfile } from '@oj2/contract'
+import { and, count, countDistinct, desc, eq, gte, inArray, isNull, sql } from 'drizzle-orm'
+import { Hono } from 'hono'
+
+import { requireAuth, type AppEnv } from '../auth/middleware'
+import { db, schema } from '../db'
+import { parseBody, success } from '../http'
+import { JudgeStatus } from '../judge/status'
+import { calendarDay, dayNumber, dayStart, weekStart } from '../time'
+
+export const mascotRoutes = new Hono<AppEnv>()
+
+/**
+ * 每人每分钟最多记这么多条。正常点她一分钟到不了十条（连点只记开头、彩蛋和嫌烦那几下），
+ * 拿脚本刷的才会撞上；撞上了就静默丢掉，不报错 —— 前台本来也不等这个结果
+ */
+const EVENTS_PER_MINUTE = 30
+const windows = new Map<number, { start: number; count: number }>()
+
+function allow(userId: number) {
+  const now = Date.now()
+  const entry = windows.get(userId)
+  if (!entry || now - entry.start >= 60_000) {
+    windows.set(userId, { start: now, count: 1 })
+    // 顺手清掉过期的，免得 Map 跟着在线人数一直涨
+    if (windows.size > 2000) for (const [id, it] of windows) if (now - it.start >= 60_000) windows.delete(id)
+    return true
+  }
+  entry.count++
+  return entry.count <= EVENTS_PER_MINUTE
+}
+
+/** 记一条看板娘互动（种类见契约 mascotEventSchema） */
+mascotRoutes.post('/mascot/events', requireAuth, async (c) => {
+  const parsed = await parseBody(c, mascotEventSchema, '看板娘记录的格式不对')
+  if (!parsed.success) return parsed.response
+  const user = c.get('user')!
+  if (allow(user.id)) {
+    const { kind, situation, line, action, path } = parsed.data
+    await db.insert(schema.mascotEvent).values({ userId: user.id, kind, situation, line, action, path })
+  }
+  return success(c, null)
+})
+
+/** 跨天记得的事只翻这么多天以内的 */
+const MEMORY_DAYS = 7
+
+/** 几个东八区日历日以前；不在 MEMORY_DAYS 以内、或之后已经说过那句了，就是 null */
+function daysAgo(at: string | null, saidAt: string | null) {
+  // 按时刻比，别按字符串：库里出来的带微秒、位数不一定一样
+  if (!at || (saidAt && Date.parse(saidAt) > Date.parse(at))) return null
+  const days = dayNumber(calendarDay()) - dayNumber(calendarDay(at))
+  return days >= 1 && days <= MEMORY_DAYS ? days : null
+}
+
+/** 跨天记得的事（契约 mascotProfileSchema.memory），一条语句查完 */
+async function memoryOf(userId: number) {
+  const today = dayStart()
+  const since = new Date(Date.parse(today) - MEMORY_DAYS * 86_400_000).toISOString()
+  const e = schema.mascotEvent
+  /** 7 天内最后一次。`beforeToday`：今天的事不算「记得」，只取今天以前的 */
+  const last = (kind: string, situation: string | null, beforeToday: boolean) => sql`(
+    select max(${e.createdAt}) from ${e}
+    where ${e.userId} = ${userId} and ${e.kind} = ${kind}
+      ${situation ? sql`and ${e.situation} = ${situation}` : sql``}
+      and ${e.createdAt} >= ${since}
+      ${beforeToday ? sql`and ${e.createdAt} < ${today}` : sql``}
+  )`
+  const s = schema.submission
+  const [row] = await db.execute<{
+    sulk_at: string | null
+    grudge_at: string | null
+    pat_at: string | null
+    pat_said_at: string | null
+    closer_at: string | null
+    solved_before: number
+  }>(sql`
+    select
+      ${last('open', 'sulk', true)} as sulk_at,
+      ${last('open', 'memory.grudge', false)} as grudge_at,
+      ${last('pat', null, true)} as pat_at,
+      ${last('open', 'memory.pat', false)} as pat_said_at,
+      ${last('open', 'memory.closer', false)} as closer_at,
+      (
+        select count(distinct ${s.problemId})::int from ${s}
+        where ${s.userId} = ${userId} and ${s.result} in (${JudgeStatus.ACCEPTED}, ${JudgeStatus.AST_CHECK_FAILED})
+          and ${s.createTime} < ${today}
+      ) as solved_before
+  `)
+  return {
+    grudgeDaysAgo: daysAgo(row?.sulk_at ?? null, row?.grudge_at ?? null),
+    patDaysAgo: daysAgo(row?.pat_at ?? null, row?.pat_said_at ?? null),
+    solvedBeforeToday: row?.solved_before ?? 0,
+    closerSaidToday: !!row?.closer_at && Date.parse(row.closer_at) >= Date.parse(today),
+  }
+}
+
+/** 最近多少次题库提交拿来看学生常犯哪类错 */
+const RECENT_SUBMISSIONS = 20
+
+/** 看板娘按学生的行为挑话用的那几个数（契约 mascotProfileSchema） */
+mascotRoutes.get('/mascot/profile', requireAuth, async (c) => {
+  const userId = c.get('user')!.id
+  const s = schema.submission
+
+  const week = weekStart()
+  const e = schema.mascotEvent
+  const [pokes, solved, memory, today, recent, tooHard, weekSubmits, weekEvents, weekHints] = await Promise.all([
+    db
+      .select({ value: count() })
+      .from(schema.mascotEvent)
+      .where(and(eq(schema.mascotEvent.userId, userId), eq(schema.mascotEvent.kind, 'open'))),
+    // 成就每次判完都重数一遍存进 user_stat，直接读，不再按提交现数
+    db
+      .select({ value: sql<number>`coalesce((${schema.userStat.metrics}->>'accepted_count')::int, 0)` })
+      .from(schema.userStat)
+      .where(eq(schema.userStat.userId, userId)),
+    memoryOf(userId),
+    db
+      .select({ value: countDistinct(s.problemId) })
+      .from(s)
+      .where(and(eq(s.userId, userId), eq(s.result, 0), gte(s.createTime, dayStart()))),
+    db
+      .select({ result: s.result, errorType: sql<string | null>`${s.statisticInfo}->'runtime_error'->>'type'` })
+      .from(s)
+      .where(and(eq(s.userId, userId), isNull(s.contestId)))
+      .orderBy(desc(s.createTime))
+      .limit(RECENT_SUBMISSIONS),
+    db
+      .select({ value: count() })
+      .from(schema.reaction)
+      .where(and(eq(schema.reaction.userId, userId), eq(schema.reaction.type, 'too_hard'))),
+    db
+      .select({ value: count() })
+      .from(s)
+      .where(and(eq(s.userId, userId), isNull(s.contestId), gte(s.createTime, week))),
+    db
+      .select({ kind: e.kind, value: count() })
+      .from(e)
+      .where(and(eq(e.userId, userId), inArray(e.kind, ['trial', 'help']), gte(e.createdAt, week)))
+      .groupBy(e.kind),
+    db
+      .select({ value: count() })
+      .from(schema.aiHint)
+      .innerJoin(s, eq(s.id, schema.aiHint.submissionId))
+      .where(and(eq(s.userId, userId), gte(schema.aiHint.createTime, week))),
+  ])
+  const eventCount = (kind: string) => weekEvents.find((row) => row.kind === kind)?.value ?? 0
+
+  const types = new Map<string, number>()
+  for (const row of recent) if (row.result === 4 && row.errorType) types.set(row.errorType, (types.get(row.errorType) ?? 0) + 1)
+  const topType = [...types.entries()].sort((a, b) => b[1] - a[1])[0]?.[0] ?? null
+  const tally = (...results: number[]) => recent.filter((row) => results.includes(row.result)).length
+
+  return success(c, {
+    pokes: pokes[0]?.value ?? 0,
+    solved: solved[0]?.value ?? 0,
+    memory,
+    todaySolved: today[0]?.value ?? 0,
+    tooHard: tooHard[0]?.value ?? 0,
+    week: {
+      submits: weekSubmits[0]?.value ?? 0,
+      trials: eventCount('trial'),
+      helps: eventCount('help'),
+      aiHints: weekHints[0]?.value ?? 0,
+    },
+    recent: {
+      total: recent.length,
+      wrongAnswer: tally(-1),
+      compileError: tally(-2),
+      runtimeError: tally(4, 3),
+      timeout: tally(1, 2),
+      runtimeErrorType: topType,
+    },
+  } satisfies MascotProfile)
+})

apps/api/src/routes/problem.ts

@@ -12,6 +12,7 @@ import {
   type ProblemListItem,
   type ProblemProgress,
   type ProblemTypeFilter,
+  type SimilarProblem,
   type Tag,
 } from '@oj2/contract'
 import { and, asc, count, countDistinct, desc, eq, ilike, inArray, isNull, ne, notInArray, or, sql } from 'drizzle-orm'
@@ -327,13 +328,25 @@ problemRoutes.get('/challenges', requireAuth, async (c) => {
 
 problemRoutes.get('/problems/:displayId/similar', optionalAuth, async (c) => {
   const [target] = await db
-    .select({ id: schema.problem.id })
+    .select({ id: schema.problem.id, difficulty: schema.problem.difficulty })
     .from(schema.problem)
     .where(and(sql`lower(${schema.problem.displayId}) = lower(${c.req.param('displayId')})`, isNull(schema.problem.contestId)))
     .limit(1)
   if (!target) return failure(c, 404, 'problem-not-found', 'Problem not found')
-  const targetTags = await db.select({ id: schema.problemTags.problemtagId }).from(schema.problemTags).where(eq(schema.problemTags.problemId, target.id))
-  if (targetTags.length === 0) return success(c, [])
+  // 知识点和主题标签一样算（用户 2026-11-03 定：同一套题材也算相似）。知识点排在前面
+  // 只是为了「共同的标签」那行先写练的是什么
+  const targetTags = await db
+    .select({ id: schema.problemTags.problemtagId, name: schema.problemTag.name })
+    .from(schema.problemTags)
+    .innerJoin(schema.problemTag, eq(schema.problemTags.problemtagId, schema.problemTag.id))
+    .where(eq(schema.problemTags.problemId, target.id))
+    // 同一类里大的在前，和题目列表「知识点」那列一样
+    .orderBy(
+      sql`${schema.problemTag.category} = 'knowledge' desc`,
+      sql`(select count(*) from ${schema.problemTags} pt where pt.problemtag_id = ${schema.problemTag.id}) desc`,
+      asc(schema.problemTag.name),
+    )
+  if (targetTags.length === 0) return success(c, [] satisfies SimilarProblem[])
   // 「已 AC 的不再推荐」必须下推到 SQL。早先是先 limit(5) 再在内存里筛，刷题多的
   // 学生 5 条候选能被筛到只剩一两条、甚至清零（前端 v-if 一空整块就不渲染）——
   // 而这个接口恰好只在**刚 AC** 或**连挂三次**时才被调用，正是候选最容易全中的时候。
@@ -343,7 +356,12 @@ problemRoutes.get('/problems/:displayId/similar', optionalAuth, async (c) => {
   const solvedIds = states ? [...states.solved] : []
   // difficulty 是 text（Low / Mid / High），直接 order by 走的是字典序 ——
   // High 排在 Low 前面，「由易到难」会变成「最难的先上」。按语义显式排。
+  // 共同标签一样多时先给和原题难度最接近的：原来一律简单的在前，做对一道困难题，
+  // 五条推荐里三条多是简单题（本地库 35 道困难题：119 / 175）。再并列才先简单的，
+  // 照顾连错三次的人
+  const rankOf = (difficulty: string) => (difficulty === 'Low' ? 0 : difficulty === 'Mid' ? 1 : 2)
   const difficultyRank = sql`case ${schema.problem.difficulty} when 'Low' then 0 when 'Mid' then 1 else 2 end`
+  const difficultyGap = sql`abs(${difficultyRank} - ${sql.raw(String(rankOf(target.difficulty)))})`
   const sharedTags = count(schema.problemTags.problemtagId)
   const rows = await db
     .select({
@@ -376,13 +394,16 @@ problemRoutes.get('/problems/:displayId/similar', optionalAuth, async (c) => {
     )
     .groupBy(schema.problem.id, schema.user.id, schema.userProfile.realName)
     // 末尾的 id 是稳定排序用的：并列时没有它，同一道题两次请求能返回不同的 5 条
-    .orderBy(desc(sharedTags), asc(difficultyRank), desc(schema.problem.acceptedNumber), asc(schema.problem.id))
+    .orderBy(desc(sharedTags), asc(difficultyGap), asc(difficultyRank), desc(schema.problem.acceptedNumber), asc(schema.problem.id))
     .limit(5)
   const ids = rows.map((row) => row.problem.id)
   const [tags, counts] = await Promise.all([getProblemTags(ids), problemUserCounts(ids)])
   return success(
     c,
-    rows.map((row) => listItem(row, tags, statuses, states, counts)),
+    rows.map((row) => {
+      const own = new Set(tags.get(row.problem.id))
+      return { ...listItem(row, tags, statuses, states, counts), sharedTags: targetTags.map((tag) => tag.name).filter((name) => own.has(name)) }
+    }) satisfies SimilarProblem[],
   )
 })
 

apps/api/src/routes/ranking.ts

@@ -252,14 +252,7 @@ rankingRoutes.get('/rankings/champions', optionalAuth, async (c) => {
   const champions: WeeklyChampion[] = []
   for (let k = 1; k <= CHAMPION_WEEKS; k++) {
     const from = thisWeek - k * WEEK_MS
-    const inWeek = entrants.map((entrant) => {
-      const keep = entrant.times.map((time, index) => [time, entrant.stamps[index]!] as const).filter(([time]) => time >= from && time < from + WEEK_MS)
-      return {
-        ...entrant,
-        times: keep.map(([time]) => time),
-        stamps: keep.map(([, stamp]) => stamp),
-      }
-    })
+    const inWeek = entrants.map((entrant) => ({ ...entrant, times: entrant.times.filter((time) => time >= from && time < from + WEEK_MS) }))
     const [top] = standings(inWeek, null, false)
     if (!top) continue
     champions.push({

apps/api/src/routes/submission-statistics.ts

@@ -527,6 +527,11 @@ const LESSON_LIVE_MINUTES = 15
 /** 一次列多少节课。「一节课」「今天」一般一两行，「这学期」「全部」有几百节，先给最近的这些 */
 const LESSONS_DEFAULT = 50
 const LESSONS_MAX = 500
+/** 课只算学生（STUDENT_ROLES，学生管理员也算），老师试题的提交不算 */
+const studentRoles = sql.join(
+  STUDENT_ROLES.map((role) => sql`${role}`),
+  sql`, `,
+)
 
 type StatisticsRange = { start: string | null; end: string }
 
@@ -599,7 +604,7 @@ async function assignedLessons(plans: LessonPlan[], range: StatisticsRange) {
         where s.contest_id is null and p.mode <> 'flowchart'
           and s.create_time <= ${range.end}
           ${range.start ? sql`and s.create_time >= ${range.start}` : sql``}
-          and u.admin_type = 'Regular User' and u.is_disabled = false
+          and u.admin_type in (${studentRoles}) and u.is_disabled = false
         union all
         select p.k, f.user_id, f.problem_id, (f.status = 2 and coalesce(f.ai_grade in (${sql.join(
           FLOWCHART_PASS_GRADES.map((grade) => sql`${grade}`),
@@ -612,7 +617,7 @@ async function assignedLessons(plans: LessonPlan[], range: StatisticsRange) {
         where p.mode <> 'code'
           and f.create_time <= ${range.end}
           ${range.start ? sql`and f.create_time >= ${range.start}` : sql``}
-          and u.admin_type = 'Regular User' and u.is_disabled = false
+          and u.admin_type in (${studentRoles}) and u.is_disabled = false
       )
       select k, problem_id,
         count(distinct user_id)::int as users,
@@ -721,8 +726,8 @@ submissionStatisticsRoutes.get('/submissions/statistics/lessons', requireTeacher
       where s.contest_id is null
         and s.create_time <= ${range.end}
         ${range.start ? sql`and s.create_time >= ${range.start}` : sql``}
-        -- 只算普通学生：老师试题的提交不该把一段拼成「一节课」
-        and u.admin_type = 'Regular User' and u.is_disabled = false
+        -- 只算学生（学生管理员也是学生）：老师试题的提交不该把一段拼成「一节课」
+        and u.admin_type in (${studentRoles}) and u.is_disabled = false
     ),
     g as (
       select *,

apps/api/src/routes/task.ts

@@ -5,7 +5,6 @@ import {
   type TaskBoard,
   type TaskBoardStudent,
   type ClassLesson,
-  lessonNeeds,
   type StatisticInfo,
 } from '@oj2/contract'
 import { and, desc, eq, gte, inArray, isNotNull, isNull, sql } from 'drizzle-orm'
@@ -127,9 +126,14 @@ taskRoutes.get('/task/board', requireTeacher, async (c) => {
   const challengeDoneKeys = new Set(
     challengeDone.filter((row) => liveChallenges.get(row.problemId)?.has(row.challengeId)).map((row) => `${row.userId}:${row.problemId}`),
   )
-  // 老师布置的这节做什么；推断出来的课为 null，代码交对或流程图画对都算（和加「做什么」之前一样）
+  // 老师布置的这节做什么；推断出来的课为 null，代码交对或流程图画对都算（和加「做什么」之前一样）。
+  // 格子按每道题合起来的要求算（todayNeeds）：先画流程图一节、再写代码一节，没画图的照样标「缺图」，
+  // 和学生那边的「做完」对得上。代码按的语言也是合起来那份：最后一节只画流程图时，用前面写代码那节的
   const mode = lesson.source === 'teacher' ? lesson.mode : null
-  const needs = mode ? lessonNeeds(mode) : null
+  const steps = lesson.steps
+  const needsOf = (problemId: number) => steps?.needsOf(problemId) ?? null
+  const anyDraw = ids.some((id) => needsOf(id)?.draw)
+  const codeLanguage = steps ? steps.language : lesson.language
   const [cells, lastSubmits, lastDrawn, attendance, drawn, todays, seen, lastFlows] = await Promise.all([
     ids.length && userIds.length
       ? db
@@ -145,7 +149,7 @@ taskRoutes.get('/task/board', requireTeacher, async (c) => {
               isNull(schema.submission.contestId),
               inArray(schema.submission.userId, userIds),
               inArray(schema.submission.problemId, ids),
-              lessonLanguageFilter(lesson.language),
+              lessonLanguageFilter(codeLanguage),
             ),
           )
           .groupBy(schema.submission.userId, schema.submission.problemId)
@@ -223,7 +227,7 @@ taskRoutes.get('/task/board', requireTeacher, async (c) => {
               inArray(schema.submission.userId, userIds),
               inArray(schema.submission.problemId, ids),
               gte(schema.submission.createTime, start),
-              lessonLanguageFilter(lesson.language),
+              lessonLanguageFilter(codeLanguage),
             ),
           )
           .orderBy(schema.submission.createTime)
@@ -234,7 +238,7 @@ taskRoutes.get('/task/board', requireTeacher, async (c) => {
      * 还没画对的格子点开讲它哪里错、按走对几组归堆。走对几组从 2026-10 起的「走例子」报告里数，
      * 老评法和还没评完的为 null
      */
-    needs?.draw && ids.length && userIds.length
+    anyDraw && ids.length && userIds.length
       ? db
           .selectDistinctOn([schema.flowchartSubmission.userId, schema.flowchartSubmission.problemId], {
             userId: schema.flowchartSubmission.userId,
@@ -281,6 +285,7 @@ taskRoutes.get('/task/board', requireTeacher, async (c) => {
       title: problem.title,
       isSql: problem.isSql,
       hasChallenges: (liveChallenges.get(problem.id)?.size ?? 0) > 0,
+      mode: steps?.modeOf(problem.id) ?? null,
     })),
     students: roster.map(
       (student) =>
@@ -289,6 +294,7 @@ taskRoutes.get('/task/board', requireTeacher, async (c) => {
           username: student.username,
           realName: student.realName ?? null,
           cells: ids.map((id) => {
+            const needs = needsOf(id)
             const key = `${student.userId}:${id}`
             const cell = cellByKey.get(key)
             const flow = drawnByKey.get(key)
@@ -305,11 +311,11 @@ taskRoutes.get('/task/board', requireTeacher, async (c) => {
               attempts = (cell?.attempts ?? 0) + (flow?.attempts ?? 0)
             } else {
               // 要哪几步看哪几步：两步都做到的时刻是晚的那一步
-              const steps = [needs.draw ? { status: drawStatus, at: flowAt } : null, needs.code ? { status: codeStatus, at: codeAt } : null].filter(
+              const wanted = [needs.draw ? { status: drawStatus, at: flowAt } : null, needs.code ? { status: codeStatus, at: codeAt } : null].filter(
                 (step) => step !== null,
               )
-              acceptedAt = steps.every((step) => step.at) ? steps.map((step) => step.at!).reduce(latestOf) : null
-              status = acceptedAt ? 'accepted' : steps.some((step) => step.status !== 'none') ? 'tried' : 'none'
+              acceptedAt = wanted.every((step) => step.at) ? wanted.map((step) => step.at!).reduce(latestOf) : null
+              status = acceptedAt ? 'accepted' : wanted.some((step) => step.status !== 'none') ? 'tried' : 'none'
               attempts = (needs.code ? (cell?.attempts ?? 0) : 0) + (needs.draw ? (flow?.attempts ?? 0) : 0)
             }
             // 下面几样都是代码那一步的：只画流程图的课没有
@@ -352,8 +358,9 @@ taskRoutes.get('/task/board', requireTeacher, async (c) => {
                   }))
                 : [],
               acceptedTry: firstTry >= 0 ? firstTry + 1 : null,
+              // 整道题做完了才谈挑战：先画再写只交对了代码、图还没画的，格子是「缺图」，不挂挑战的圈
               challenge:
-                !codeWanted || !codeDone || !liveChallenges.get(id)?.size
+                !codeWanted || !codeDone || !acceptedAt || !liveChallenges.get(id)?.size
                   ? null
                   : challengeDoneKeys.has(key)
                     ? 'done'
@@ -410,9 +417,17 @@ taskRoutes.get('/task/today', requireTeacher, async (c) => {
       const ids = lesson.problems.map((problem) => problem.id)
       let allDoneCount = 0
       if (ids.length && lesson.source === 'teacher' && lesson.lessonId && lesson.mode) {
-        // 老师布置的：和任务页、后台课堂任务同一个口径（要画的看图、要写的看代码）
+        // 老师布置的：和任务页同一个口径（每道题按今天几节合起来的要求，要画的看图、要写的看代码）
         const counts = await lessonDoneCounts([
-          { id: lesson.lessonId, className, day: calendarDay(), problemIds: ids, language: lesson.language, mode: lesson.mode },
+          {
+            id: lesson.lessonId,
+            className,
+            day: calendarDay(),
+            problemIds: ids,
+            language: lesson.steps?.language ?? lesson.language,
+            mode: lesson.mode,
+            modeOf: lesson.steps?.modeOf,
+          },
         ])
         allDoneCount = counts.get(lesson.lessonId) ?? 0
       } else if (ids.length) {

apps/api/src/services/achievement-metrics.ts

@@ -17,22 +17,22 @@ export const ACHIEVEMENT_METRICS: AchievementMetric[] = [
   {
     key: 'accepted_count',
     name: '做对的题数',
-    helpText: '去重后通过的题目数量（不含比赛）',
+    helpText: '去重后通过的题目数量（含比赛题）',
   },
   {
     key: 'mid_ac_count',
     name: '做对的中等题',
-    helpText: '去重后通过的中等难度题目数（不含比赛）',
+    helpText: '去重后通过的中等难度题目数（含比赛题）',
   },
   {
     key: 'hard_ac_count',
     name: '做对的困难题',
-    helpText: '去重后通过的困难题目数（不含比赛）',
+    helpText: '去重后通过的困难题目数（含比赛题）',
   },
   {
     key: 'submission_count',
     name: '提交次数',
-    helpText: '提交次数（不含比赛）',
+    helpText: '提交次数（含比赛）',
   },
   { key: 'active_days', name: '有提交的天数', helpText: '有过提交的累计天数' },
   {
@@ -45,13 +45,13 @@ export const ACHIEVEMENT_METRICS: AchievementMetric[] = [
   {
     key: 'max_ac_week_streak',
     name: '连续有新做对的周数',
-    helpText: '连续几个自然周（周一起）每周都至少新通过一道题（不含比赛）',
+    helpText: '连续几个自然周（周一起）每周都至少新通过一道题（含比赛题）',
   },
   { key: 'languages_used', name: '用过几种语言', helpText: '用过多少种编程语言' },
   {
     key: 'contest_joined',
     name: '参加比赛',
-    helpText: '参加过的比赛数量（本指标是比赛维度，不受比赛提交不计入的限制）',
+    helpText: '交过题的比赛数量',
   },
   { key: 'badge_count', name: '专题奖章', helpText: '获得的专题奖章数量' },
   {
@@ -59,6 +59,11 @@ export const ACHIEVEMENT_METRICS: AchievementMetric[] = [
     name: '做完的专题',
     helpText: '完成的专题数量',
   },
+  {
+    key: 'challenge_count',
+    name: '挑战成功',
+    helpText: '做对之后的挑战，做到了几条（每道题的每条挑战算一次）',
+  },
   {
     key: 'first_try_ac_count',
     name: '一次就对的题',
@@ -92,7 +97,7 @@ export const ACHIEVEMENT_METRICS: AchievementMetric[] = [
   {
     key: 'max_code_lines',
     name: '最长的代码行数',
-    helpText: '做对的提交里最长的代码有多少行（空行不算，不含比赛）',
+    helpText: '做对的提交里最长的代码有多少行（空行不算，含比赛）',
   },
   {
     key: 'achievement_unlocked_count',

apps/api/src/services/achievements.ts

@@ -1,4 +1,4 @@
-import { and, count, countDistinct, eq, inArray, isNotNull, isNull, lt, ne, notInArray, sql } from 'drizzle-orm'
+import { and, count, countDistinct, eq, inArray, isNotNull, lt, ne, notInArray, sql } from 'drizzle-orm'
 
 import { db, schema, type DbOrTx } from '../db'
 import { publishAchievementNotification } from '../events'
@@ -82,12 +82,17 @@ const ACCEPTED_RESULTS = sql.join([sql`${JudgeStatus.ACCEPTED}`, sql`${JudgeStat
 
 /**
  * 「做对几道 / 中等几道 / 困难几道 / 一次就对几道」按定义从提交表现数，不再逐次 +1。
+ * 参加过几场比赛、挑战成功几次也在这里一起数。
  *
  * 原来是读一遍这道题之前的提交、判断「是不是第一次做对」再 +1，两处漏：同一个人同一道题
  * 两条提交挨着判完，两边都看见对方已经做对（都不加）或都还没做对（加两次）；重判一条
  * 做对的提交又会再加一次。2026-10 的库里 372 人的做对题数比实际多 1–4 道。
  * 现数是幂等的，怎么并发、怎么重判都是同一个答案。走 submission_public_metrics_idx，
  * 一个人的提交也就几百条。
+ *
+ * **比赛里的提交也算**（2026-11-03 起）：这里的比赛其实是单班测验，有的班整学期都在
+ * 比赛里做题，不算的话一个成就都拿不到。比赛题是单独的题目行，不会和题库里同一道题重复数。
+ * 个人主页 / 排名的做对题数（user_profile.accepted_number）仍然不含比赛，两边对不上是有意的。
  */
 async function solvedCounts(tx: DbOrTx, userId: number) {
   const [row] = await tx.execute<{
@@ -95,13 +100,15 @@ async function solvedCounts(tx: DbOrTx, userId: number) {
     mid: number
     hard: number
     first_try: number
+    contests: number
+    challenges: number
   }>(
     sql`
       with mine as (
-        select s.problem_id, s.result, s.create_time, s.id, p.difficulty
+        select s.problem_id, s.contest_id, s.result, s.create_time, s.id, p.difficulty
         from ${schema.submission} s
         join ${schema.problem} p on p.id = s.problem_id
-        where s.user_id = ${userId} and s.contest_id is null
+        where s.user_id = ${userId}
       )
       select
         count(distinct problem_id) filter (where result in (${ACCEPTED_RESULTS}))::int as accepted,
@@ -111,11 +118,13 @@ async function solvedCounts(tx: DbOrTx, userId: number) {
           select count(*)::int from (
             select distinct on (problem_id) result from mine order by problem_id, create_time, id
           ) first where result in (${ACCEPTED_RESULTS})
-        ) as first_try
+        ) as first_try,
+        count(distinct contest_id)::int as contests,
+        (select count(*)::int from ${schema.challengeSuccess} where user_id = ${userId}) as challenges
       from mine
     `,
   )
-  return row ?? { accepted: 0, mid: 0, hard: 0, first_try: 0 }
+  return row ?? { accepted: 0, mid: 0, hard: 0, first_try: 0, contests: 0, challenges: 0 }
 }
 
 /**
@@ -130,7 +139,7 @@ export async function updateAchievementsForSubmission(submissionId: string, coun
     .innerJoin(schema.problem, eq(schema.submission.problemId, schema.problem.id))
     .where(eq(schema.submission.id, submissionId))
     .limit(1)
-  if (!row || row.submission.contestId !== null) return []
+  if (!row) return []
 
   const rejudged = countedAs !== null
   const accepted = isAccepted(row.submission.result)
@@ -157,6 +166,8 @@ export async function updateAchievementsForSubmission(submissionId: string, coun
     value.mid_ac_count = solved.mid
     value.hard_ac_count = solved.hard
     value.first_try_ac_count = solved.first_try
+    value.contest_joined = solved.contests
+    value.challenge_count = solved.challenges
     if (!rejudged) value.submission_count = numberMetric(value, 'submission_count') + 1
     if (firstAc) {
       // 只数这条之前的：重判一条老提交时，它后面的提交不算「做对之前错的」
@@ -167,7 +178,6 @@ export async function updateAchievementsForSubmission(submissionId: string, coun
           and(
             eq(schema.submission.userId, row.submission.userId),
             eq(schema.submission.problemId, row.submission.problemId),
-            isNull(schema.submission.contestId),
             lt(schema.submission.createTime, row.submission.createTime),
           ),
         )
@@ -301,7 +311,7 @@ export async function rescanAchievement(achievementId: number) {
   const metric = findMetric(achievement.metric)
   if (!metric) return { scanned: 0, unlocked: 0 }
 
-  // contest_joined 不由判题结算维护，扫之前先把它刷新一遍，否则永远读到旧值（或没有值）
+  // contest_joined 判题结算从 2026-11-03 起才维护，那之后没再交过题的人还是旧值，扫之前刷新一遍
   if (achievement.metric === 'contest_joined') await refreshContestJoinedForAll()
   // max_ac_week_streak 是后加的指标，判题结算只从上线那天起累计，存量用户要从提交记录补算
   if (achievement.metric === 'max_ac_week_streak') await refreshAcWeekStreakForAll()
@@ -482,7 +492,7 @@ async function refreshContestJoinedForAll() {
  * `_last_ac_week` / `_current_ac_week_streak` 一起写回 user_stat（jsonb 浅合并，
  * 其余指标不动，写法同 refreshContestJoinedForAll）。
  *
- * 「新通过」= 这道题（不含比赛）第一次通过的那次，和判题结算里 firstAc 同一个口径；
+ * 「新通过」= 这道题（含比赛题）第一次通过的那次，和判题结算里 firstAc 同一个口径；
  * 周按东八区自然周（周一起），SQL 里用 localTime 取墙上时间再 date_trunc。
  */
 async function refreshAcWeekStreakForAll() {
@@ -495,7 +505,7 @@ async function refreshAcWeekStreakForAll() {
     // 只算还在的用户：库里有提交的 user_id 已经对不上任何用户（submission.user_id 上没有
     // 外键，是历史遗留），直接写 user_stat 会撞 user_stat 的外键，整次重算失败
     .innerJoin(schema.user, eq(schema.user.id, schema.submission.userId))
-    .where(and(isNull(schema.submission.contestId), inArray(schema.submission.result, [JudgeStatus.ACCEPTED, JudgeStatus.AST_CHECK_FAILED])))
+    .where(inArray(schema.submission.result, [JudgeStatus.ACCEPTED, JudgeStatus.AST_CHECK_FAILED]))
     .groupBy(schema.submission.userId, schema.submission.problemId)
     .as('first_accepted')
   const week = sql<string>`to_char(date_trunc('week', ${localTime(firstAccepted.firstAt)}), 'YYYY-MM-DD')`

apps/api/src/services/lesson.ts

@@ -59,7 +59,16 @@ export function lessonDayEnd(day: string) {
  * 人按花名册（STUDENT_ROLES、没禁用），和「全班几人」对得上
  */
 export async function lessonDoneCounts(
-  lessons: { id: number; className: string; day: string; problemIds: number[]; language: LessonLanguage | null; mode: LessonMode }[],
+  lessons: {
+    id: number
+    className: string
+    day: string
+    problemIds: number[]
+    language: LessonLanguage | null
+    mode: LessonMode
+    /** 每道题各自做什么（老师首页按今天几节合起来的要求算，见 todayNeeds）；不给就都按 mode */
+    modeOf?: (problemId: number) => LessonMode
+  }[],
 ) {
   const rows = lessons.flatMap((lesson) =>
     lesson.problemIds.map((problemId) => ({
@@ -67,7 +76,7 @@ export async function lessonDoneCounts(
       class_name: lesson.className,
       problem_id: problemId,
       language: lesson.language,
-      mode: lesson.mode,
+      mode: lesson.modeOf?.(problemId) ?? lesson.mode,
       until: lessonDayEnd(lesson.day),
     })),
   )
@@ -281,6 +290,45 @@ async function lessonPlan(className: string, day: string) {
   return row?.problemIds.length ? row : null
 }
 
+/**
+ * 一道题今天要画还是要写：这个班今天布置过的每一节里，凡是有这道题的，要求合起来算。
+ * 老师先布置一节画流程图、再「用这几道题写代码」开一节时，还没画完的照样要画 ——
+ * 只看今天最后布置的那一节的话，一布置写代码，画图那一步就没了。学生的课堂条、任务页的格子、
+ * 老师首页的「全做对」都按它算，三处说的「做完」才一样（后台和数据统计还是一节一行、各数各的）。
+ *
+ * `language`：代码按什么语言数 —— 今天最后布置的、要写代码的那一节选的（只画流程图的课没有语言）
+ */
+export async function todayNeeds(className: string, problemIds: number[], latest: { id: number; language: LessonLanguage | null; mode: LessonMode }) {
+  const rows = await db
+    .select({ id: schema.classLesson.id, problemIds: schema.classLesson.problemIds, language: schema.classLesson.language, mode: schema.classLesson.mode })
+    .from(schema.classLesson)
+    .where(and(eq(schema.classLesson.className, className), eq(schema.classLesson.day, calendarDay())))
+    .orderBy(desc(schema.classLesson.createdAt), desc(schema.classLesson.id))
+  const needs = new Map<number, { draw: boolean; code: boolean }>()
+  let language: LessonLanguage | null = lessonNeeds(latest.mode).code ? latest.language : null
+  let languageFound = lessonNeeds(latest.mode).code
+  for (const row of rows) {
+    const shared = row.id === latest.id ? problemIds : row.problemIds.filter((id) => problemIds.includes(id))
+    if (!shared.length) continue
+    const rowNeeds = lessonNeeds(row.mode)
+    for (const id of shared) {
+      const known = needs.get(id) ?? { draw: false, code: false }
+      needs.set(id, { draw: known.draw || rowNeeds.draw, code: known.code || rowNeeds.code })
+    }
+    if (!languageFound && rowNeeds.code) {
+      language = row.language ?? null
+      languageFound = true
+    }
+  }
+  const latestNeeds = lessonNeeds(latest.mode)
+  const needsOf = (id: number) => needs.get(id) ?? latestNeeds
+  const modeOf = (id: number): LessonMode => {
+    const { draw, code } = needsOf(id)
+    return draw && code ? 'both' : draw ? 'flowchart' : 'code'
+  }
+  return { needsOf, modeOf, language }
+}
+
 /**
  * 班里「这节课」的题。老师在课堂任务布置过就用老师的（source = teacher），
  * 否则从同班提交记录推断（source = inferred）：同班同一天 ≥ 5 人做过的题，只取最近的
@@ -294,17 +342,23 @@ export async function classLessonProblems(className: string, lookbackDays: numbe
   const plan = await lessonPlan(className, today)
   if (plan) {
     const planned = plan.problemIds
-    const [problems, groups] = await Promise.all([
+    const steps = await todayNeeds(className, planned, plan)
+    // 每道题按它合起来的要求数「做过 / 做对」：要求一样的几道一起数
+    const byMode = Map.groupBy(planned, (id) => steps.modeOf(id))
+    const [problems, ...groupLists] = await Promise.all([
       visibleProblems(planned),
-      classDayGroups(className, dayStart(), { problemIds: planned, language: plan.language, mode: plan.mode }),
+      ...[...byMode].map(([mode, ids]) =>
+        classDayGroups(className, dayStart(), { problemIds: ids, language: lessonNeeds(mode).code ? steps.language : null, mode }),
+      ),
     ])
-    const groupById = new Map(groups.map((row) => [row.problemId, row]))
+    const groupById = new Map(groupLists.flat().map((row) => [row.problemId, row]))
     return {
       source: 'teacher' as const,
       lessonId: plan.id,
       day: today,
       language: plan.language ?? null,
       mode: plan.mode,
+      steps,
       assignedAt: plan.createdAt,
       assignedBy: plan.createdBy,
       problems: planned.flatMap((id) => {
@@ -337,6 +391,7 @@ export async function classLessonProblems(className: string, lookbackDays: numbe
     // 推断出来的课不知道老师要的是哪种语言、要画还是要写，不限
     language: null,
     mode: null,
+    steps: null,
     assignedAt: null,
     assignedBy: null,
     problems: picked.flatMap((row) => {

apps/api/src/services/ranking.ts

@@ -36,9 +36,8 @@ export interface Entrant {
   className: string | null
   avatar: string | null
   mood: string | null
-  /** 每道题第一次做对的时刻，升序；毫秒数用来比较，原文留着给出参 */
+  /** 每道题第一次做对的时刻（毫秒），升序 */
   times: number[]
-  stamps: string[]
 }
 
 export interface Standing {
@@ -64,10 +63,26 @@ export function avatarOf(avatar: string | null) {
  * 先按 (人, 题) 取全部历史里的最早一次，再用 having 卡 `>= since` —— 这样「这学期」数的是
  * 这学期**第一次**做对的题，以前做对过的老题这学期重交一遍不算。比赛里的提交不算。
  * 走 `submission_public_metrics_idx`（user_id, problem_id, result, create_time，WHERE
- * contest_id IS NULL），全服全部历史实测 24ms。
+ * contest_id IS NULL）。
+ *
+ * 时刻在库里就换成毫秒数、按人排好聚成数组再拿回来：全服全部历史有六万多个 (人, 题)，
+ * 一行一个 timestamptz 的话，光 db/index.ts 那个保留微秒的 parser 加 `Date.parse` 就
+ * 要 150ms（两核上），库里的查询本身才 40ms。截到毫秒和原来 `Date.parse` 比较的精度一样，
+ * 名次不变；`reachedAt` 只拿来显示「比你早多久」，用不着微秒。
  */
 export async function loadEntrants(where: SQL, since: string | null): Promise<Entrant[]> {
   const firstSolved = min(schema.submission.createTime)
+  const firsts = db
+    .select({
+      userId: schema.submission.userId,
+      at: sql<number>`floor(extract(epoch from ${firstSolved}) * 1000)::float8`.as('at'),
+    })
+    .from(schema.submission)
+    .innerJoin(schema.user, eq(schema.user.id, schema.submission.userId))
+    .where(and(where, isNull(schema.submission.contestId), inArray(schema.submission.result, SOLVED_RESULTS)))
+    .groupBy(schema.submission.userId, schema.submission.problemId)
+    .having(since ? gte(firstSolved, since) : undefined)
+    .as('firsts')
   const [people, solves] = await Promise.all([
     db
       .select({
@@ -81,33 +96,20 @@ export async function loadEntrants(where: SQL, since: string | null): Promise<En
       .leftJoin(schema.userProfile, eq(schema.userProfile.userId, schema.user.id))
       .where(where),
     db
-      .select({ userId: schema.submission.userId, at: firstSolved })
-      .from(schema.submission)
-      .innerJoin(schema.user, eq(schema.user.id, schema.submission.userId))
-      .where(and(where, isNull(schema.submission.contestId), inArray(schema.submission.result, SOLVED_RESULTS)))
-      .groupBy(schema.submission.userId, schema.submission.problemId)
-      .having(since ? gte(firstSolved, since) : undefined),
+      .select({ userId: firsts.userId, times: sql<number[]>`array_agg(${firsts.at} order by ${firsts.at})` })
+      .from(firsts)
+      .groupBy(firsts.userId),
   ])
 
-  const byUser = new Map<number, string[]>()
-  for (const row of solves) {
-    if (!row.at) continue
-    const list = byUser.get(row.userId)
-    if (list) list.push(row.at)
-    else byUser.set(row.userId, [row.at])
-  }
-  return people.map((person) => {
-    const pairs = (byUser.get(person.id) ?? []).map((stamp) => [Date.parse(stamp), stamp] as const).sort((a, b) => a[0] - b[0])
-    return {
-      id: person.id,
-      username: person.username,
-      className: person.className,
-      avatar: avatarOf(person.avatar),
-      mood: person.mood?.trim() || null,
-      times: pairs.map(([time]) => time),
-      stamps: pairs.map(([, stamp]) => stamp),
-    }
-  })
+  const byUser = new Map(solves.map((row) => [row.userId, row.times]))
+  return people.map((person) => ({
+    id: person.id,
+    username: person.username,
+    className: person.className,
+    avatar: avatarOf(person.avatar),
+    mood: person.mood?.trim() || null,
+    times: byUser.get(person.id) ?? [],
+  }))
 }
 
 /**
@@ -127,7 +129,7 @@ export function standings(entrants: Entrant[], cutoff: number | null, includeZer
         entrant,
         solved,
         reached: solved ? entrant.times[solved - 1]! : Number.POSITIVE_INFINITY,
-        reachedAt: solved ? entrant.stamps[solved - 1]! : null,
+        reachedAt: solved ? new Date(entrant.times[solved - 1]!).toISOString() : null,
       }
     })
     .filter((row) => includeZero || row.solved > 0)

apps/web/src/admin/api.ts

@@ -786,9 +786,9 @@ export function deleteAchievement(id: number) {
 
 // ---------- 课堂任务（class_lesson） ----------
 
-export function getAdminLessons(offset: number, limit: number, filters: { className: string; teacher: number | null }) {
+export function getAdminLessons(offset: number, limit: number, filters: { className: string; teacher: number | null; mode: string }) {
   return api.get<AdminLessonList>('admin/lessons', {
-    params: { offset, limit, className: filters.className, teacher: filters.teacher ?? '' },
+    params: { offset, limit, className: filters.className, teacher: filters.teacher ?? '', mode: filters.mode },
   })
 }
 

apps/web/src/admin/task/list.vue

@@ -1,8 +1,8 @@
 <script setup lang="ts">
-import { LESSON_MODE_LABEL, type AdminLesson, type AdminLessonList } from '@oj2/contract'
+import { LESSON_MODE_LABEL, type AdminLesson, type AdminLessonList, type LessonMode } from '@oj2/contract'
 import { useRouteQuery } from '@vueuse/router'
 import PageHeader from 'admin/components/PageHeader.vue'
-import { NButton, NPopconfirm, NTooltip, useThemeVars } from 'naive-ui'
+import { NButton, NPopconfirm, NTag, NTooltip, useThemeVars } from 'naive-ui'
 import { dayStartOfDate } from 'oj/statistics/period'
 import Pagination from 'shared/components/Pagination.vue'
 import { useBreakpoints } from 'shared/composables/breakpoints'
@@ -27,13 +27,16 @@ const configStore = useConfigStore()
 const { isMobile } = useBreakpoints()
 
 // 从任务页「布置过的课」进来带着 ?className=
-const { query } = usePagination<{ className: string; teacher: string }>({
+const { query } = usePagination<{ className: string; teacher: string; mode: string }>({
   className: useRouteQuery('className', '').value,
   teacher: useRouteQuery('teacher', '').value,
+  mode: useRouteQuery('mode', '').value,
 })
 const data = ref<AdminLessonList | null>(null)
 
 const classOptions = computed(() => [{ label: '全部班级', value: '' }, ...groupClassOptions(configStore.config?.classList ?? [])])
+const MODES: LessonMode[] = ['code', 'both', 'flowchart']
+const modeOptions = [{ label: '全部做法', value: '' }, ...MODES.map((value) => ({ label: LESSON_MODE_LABEL[value], value }))]
 const teacherOptions = computed(() => [
   { label: '全部老师', value: '' },
   ...(data.value?.teachers ?? []).map((teacher) => ({ label: teacher.name, value: String(teacher.id) })),
@@ -46,13 +49,14 @@ async function list() {
     getAdminLessons((query.page - 1) * query.limit, query.limit, {
       className: query.className,
       teacher: query.teacher ? Number(query.teacher) : null,
+      mode: query.mode,
     }),
   )
   if (res) data.value = res
 }
 onMounted(list)
-// 换了班级、老师 usePagination 会把页码拨回 1，同一拍里只拉一次
-watch(() => [query.page, query.limit, query.className, query.teacher], list)
+// 换了班级、老师、做法 usePagination 会把页码拨回 1，同一拍里只拉一次
+watch(() => [query.page, query.limit, query.className, query.teacher, query.mode], list)
 
 // ---- 改 / 补 / 删 ----
 const editing = ref(false)
@@ -133,17 +137,24 @@ function renderActions(lesson: AdminLesson) {
   ])
 }
 
-/** 「画流程图」「先画再写 · C语言」「C语言」：写代码是默认的，不写出来 */
-function wayText(lesson: AdminLesson) {
-  return [lesson.mode !== 'code' ? LESSON_MODE_LABEL[lesson.mode] : '', lesson.language ? LANGUAGE_SHOW_VALUE[lesson.language] : ''].filter(Boolean).join(' · ')
+/** 三种做法各一个颜色，一眼分得开；写代码也写出来，不当默认值省掉 */
+const MODE_TAG_TYPE: Record<LessonMode, 'default' | 'info' | 'warning'> = { code: 'default', both: 'info', flowchart: 'warning' }
+
+/** 「写代码 C语言」「先画再写 Python」「画流程图」：画流程图不用语言 */
+function renderWay(lesson: AdminLesson) {
+  return h('div', { class: 'way' }, [
+    h(NTag, { size: 'small', bordered: false, type: MODE_TAG_TYPE[lesson.mode] }, { default: () => LESSON_MODE_LABEL[lesson.mode] }),
+    lesson.language ? h('span', { class: 'way-lang' }, LANGUAGE_SHOW_VALUE[lesson.language]) : null,
+  ])
 }
 
-/** 手机上一节课一张卡：日子 · 时刻 · 班级一行，题号一行，老师 · 语言 · 做完一行小字，操作一行 */
+/** 手机上一节课一张卡：日子 · 时刻 · 班级一行，做什么一行，题号一行，老师 · 做完一行小字，操作一行 */
 function renderMobileCard(lesson: AdminLesson) {
   return h('div', { class: 'm-card' }, [
     h('div', { class: 'm-head' }, `${dayText(lesson.day)} ${parseTime(lesson.createdAt, 'HH:mm')} · ${classLabel(lesson.className)}`),
+    renderWay(lesson),
     renderProblems(lesson),
-    h('div', { class: 'm-meta' }, [lesson.createdBy, wayText(lesson), `做完 ${renderDone(lesson)}`].filter(Boolean).join(' · ')),
+    h('div', { class: 'm-meta' }, `${lesson.createdBy} · 做完 ${renderDone(lesson)}`),
     renderActions(lesson),
   ])
 }
@@ -153,7 +164,7 @@ const desktopColumns: DataTableColumn<AdminLesson>[] = [
   { title: '布置', key: 'createdAt', width: 70, render: (row) => parseTime(row.createdAt, 'HH:mm') },
   { title: '班级', key: 'className', width: 130, render: (row) => classLabel(row.className) },
   { title: '老师', key: 'createdBy', width: 90 },
-  { title: '做什么', key: 'language', width: 120, render: (row) => wayText(row) || '—' },
+  { title: '做什么', key: 'mode', width: 150, render: renderWay },
   { title: '题目', key: 'problems', width: 300, render: renderProblems },
   { title: '做完 / 全班', key: 'doneCount', width: 100, render: renderDone },
   { title: '', key: 'actions', render: renderActions },
@@ -173,6 +184,7 @@ const columns = computed(() => (isMobile.value ? mobileColumns : desktopColumns)
     <template #filters>
       <n-select v-model:value="query.className" :options="classOptions" filterable aria-label="班级" :style="{ width: isMobile ? '100%' : '160px' }" />
       <n-select v-model:value="query.teacher" :options="teacherOptions" aria-label="老师" :style="{ width: isMobile ? '100%' : '140px' }" />
+      <n-select v-model:value="query.mode" :options="modeOptions" aria-label="做什么" :style="{ width: isMobile ? '100%' : '120px' }" />
     </template>
   </PageHeader>
   <n-data-table :loading="loading" striped class="lesson-table" :columns="columns" :data="data?.results ?? []" :row-key="(row: AdminLesson) => row.id" />
@@ -205,6 +217,13 @@ const columns = computed(() => (isMobile.value ? mobileColumns : desktopColumns)
   text-decoration: line-through;
 }
 
+.lesson-table :deep(.way) {
+  display: flex;
+  align-items: center;
+  gap: 6px;
+  white-space: nowrap;
+}
+
 .lesson-table :deep(.actions) {
   display: flex;
   gap: 8px;

apps/web/src/oj/achievement/index.vue

@@ -6,6 +6,7 @@ import { useBreakpoints } from 'shared/composables/breakpoints'
 import UserName from 'shared/components/UserName.vue'
 import AdminLink from 'shared/components/AdminLink.vue'
 import { useUserStore } from 'shared/store/user'
+import { useMascotGuide } from 'shared/mascot/guide'
 import { RARITY_COLOR, RARITY_LABEL } from 'utils/constants'
 import type { AchievementList, AchievementRarity, UserBadge } from 'utils/types'
 import ClassCard from './components/ClassCard.vue'
@@ -59,6 +60,15 @@ async function load() {
 
 onMounted(load)
 watch(name, load)
+
+// 看板娘：只在看自己的成就时说话。「快拿到了」里最近的一个能说成「再做对 3 道」的，报它的名字；
+// 「还差 3 次」「一天做对 5 道」这种前面加不了「再」，往后找
+useMascotGuide(() => {
+  if (!data.value || other.value || userStore.isTeacherOrAbove) return null
+  const item = near.value.find((it) => it.remain.startsWith('再'))
+  if (!item) return { situation: 'achievement' }
+  return { situation: 'achievement.near', vars: { name: item.achievement.name, need: item.remain.slice(1) } }
+})
 </script>
 
 <template>

apps/web/src/oj/achievement/series.ts

@@ -34,6 +34,12 @@ const METRICS: Record<string, MetricInfo> = {
     unit: '道',
     remain: (r) => `再做对 ${r} 道困难题`,
   },
+  challenge_count: {
+    group: '做题',
+    label: '挑战成功',
+    unit: '次',
+    remain: (r) => `再挑战成功 ${r} 次`,
+  },
   max_ac_week_streak: {
     group: '坚持',
     label: '连着几周有做对',

apps/web/src/oj/announcement/list.vue

@@ -5,6 +5,7 @@ import AdminLink from 'shared/components/AdminLink.vue'
 import NotFound from 'shared/components/NotFound.vue'
 import { useBreakpoints } from 'shared/composables/breakpoints'
 import { useUserStore } from 'shared/store/user'
+import { useMascotGuide } from 'shared/mascot/guide'
 import { errorCode } from 'utils/api'
 import { parseTime, zonedParts, zonedYear } from 'utils/functions'
 import type { Announcement, AnnouncementListItem } from 'utils/types'
@@ -27,6 +28,9 @@ const { isDesktop } = useBreakpoints()
 const announcements = ref<AnnouncementListItem[]>([])
 const loaded = ref(false)
 
+// 看板娘：只念叨一句，不给按钮
+useMascotGuide(() => ({ situation: 'announcement' }))
+
 onMounted(async () => {
   const res = await getAnnouncementList(0, LIMIT)
   announcements.value = res.results

apps/web/src/oj/api.ts

@@ -41,6 +41,7 @@ import {
   type ProblemRank,
   type CreateSubmissionResponse,
   type ProblemListItem,
+  type SimilarProblem,
   type ProblemStats,
   type ProblemProgress,
   type CreateFlowchartResponse,
@@ -412,7 +413,9 @@ export function submitHintFeedback(hintId: number, helpful: boolean) {
 // ==================== 相似题目推荐 ====================
 
 export function getSimilarProblems(problemId: string) {
-  return api.get<ProblemListItem[]>(`problems/${encodeURIComponent(problemId)}/similar`).then((response) => response.map(toProblemRow))
+  return api
+    .get<SimilarProblem[]>(`problems/${encodeURIComponent(problemId)}/similar`)
+    .then((response) => response.map((item) => ({ ...toProblemRow(item), sharedTags: item.sharedTags })))
 }
 
 // ==================== 挑战 ====================

apps/web/src/oj/contest/list.vue

@@ -12,6 +12,7 @@ import { usePagination } from 'shared/composables/pagination'
 import AdminLink from 'shared/components/AdminLink.vue'
 import { useBreakpoints } from 'shared/composables/breakpoints'
 import { useUserStore } from 'shared/store/user'
+import { goAction, useMascotGuide } from 'shared/mascot/guide'
 import { ContestStatus } from 'utils/constants'
 import ContestBadge from './components/ContestBadge.vue'
 
@@ -115,6 +116,14 @@ function open(contest: Contest) {
   router.push(userStore.isTeacherOrAbove ? `/contest/${contest.id}/class` : `/contest/${contest.id}`)
 }
 
+// 看板娘：有正在比的就带进去
+useMascotGuide(() => {
+  if (userStore.isTeacherOrAbove) return null
+  const live = active.value.find((c) => c.status === ContestStatus.underway)
+  if (!live) return { situation: 'contests.none' }
+  return { situation: 'contests.live', actions: [goAction(router, '进比赛', `/contest/${live.id}`)] }
+})
+
 function mineText(contest: Contest) {
   const mine = contest.mine
   if (!mine) return ''

apps/web/src/oj/home/student.vue

@@ -5,11 +5,13 @@ import { Icon } from '@iconify/vue'
 import { getAnnouncementList, getKnowledgeMap, getContestList, getLastVisit, getLearnProgress, getSubmissions, getTutorials, getWeeklyRank } from 'oj/api'
 import { getClassActivity } from 'shared/api'
 import SubmissionResultTag from 'shared/components/SubmissionResultTag.vue'
-import { pickHeadline, type Headline } from 'oj/user/knowledge'
+import { levelName, MAX_LEVEL, pickHeadline, remainingToNext, tagLink, type Headline } from 'oj/user/knowledge'
 import { useUserStore } from 'shared/store/user'
+import { activityMode } from 'shared/store/lesson'
+import { focusJumpAction, goAction, randomProblemAction, useMascotGuide, type MascotAction, type MascotGuide } from 'shared/mascot/guide'
 import { ContestStatus, CONTEST_STATUS, JUDGE_STATUS, LANGUAGE_SHOW_VALUE } from 'utils/constants'
 import { duration, parseTime, zonedParts, zonedYear } from 'utils/functions'
-import type { AnnouncementListItem, ClassActivity, ClassActivityProblem, Contest, LastVisit, SubmissionListItem, WeeklyRank } from 'utils/types'
+import type { AnnouncementListItem, ClassActivity, ClassActivityProblem, Contest, KnowledgeMap, LastVisit, SubmissionListItem, WeeklyRank } from 'utils/types'
 
 interface Track {
   type: TutorialType
@@ -35,6 +37,8 @@ const classActivity = ref<ClassActivity | null>(null)
 const lastVisit = ref<LastVisit | null>(null)
 /** 知识点地图挑出来的那一句（本周升级 / 再做几道升档 / 去点亮一个），见 oj/user/knowledge.ts */
 const knowledgeHeadline = ref<Headline | null>(null)
+/** 地图原样留着给看板娘：她要知识点名、档位名、还差几道，不是拼好的那句话 */
+const knowledge = ref<KnowledgeMap | null>(null)
 const loaded = ref(false)
 
 /** 头一回登录、还没交过：问候换成「欢迎」，告诉他题在哪找 */
@@ -122,7 +126,8 @@ async function loadAnnouncements() {
 }
 
 async function loadKnowledge() {
-  knowledgeHeadline.value = pickHeadline(await getKnowledgeMap())
+  knowledge.value = await getKnowledgeMap()
+  knowledgeHeadline.value = pickHeadline(knowledge.value)
 }
 
 async function loadClassActivity() {
@@ -191,7 +196,7 @@ const classActivityTitle = computed(() => {
   // 老师在课堂任务布置的，说成「老师布置的」，比「班里在做」更让人知道该做这几道
   if (classActivity.value?.source === 'teacher') {
     const language = classActivity.value.language
-    const mode = classActivity.value.mode
+    const mode = activityMode(classActivity.value)
     if (mode === 'flowchart') return '这节课 · 画流程图'
     if (mode === 'both') return `这节课 · 先画流程图，再${language ? `用${LANGUAGE_SHOW_VALUE[language]}` : ''}写代码`
     return `这节课${language ? ` · 用${LANGUAGE_SHOW_VALUE[language]}做` : ''}`
@@ -243,6 +248,86 @@ watch(
   { immediate: true },
 )
 
+// 看板娘：今天有课（和「这节课」那张卡同一个条件）就催今天的题，没课就随便做一道
+let greetedBack = false
+useMascotGuide(() => {
+  if (!loaded.value) return null
+  const random = randomProblemAction(router)
+  const learn = goAction(router, '自学', '/learn')
+  const lesson = classToday.value && !!classActivity.value?.problems.length
+  const next = nextProblem.value
+  if (lesson && next)
+    return { situation: 'home.assigned', actions: [goAction(router, '今天的题', `/problem/${next.problemDisplayId}`), focusJumpAction(), random] }
+  const base: MascotGuide = lesson
+    ? { situation: 'home.done', actions: [random, learn] }
+    : { situation: 'home.free', actions: [focusJumpAction(), random, learn] }
+  // 好久没来：只在这次进来后第一次点她时说，之后照常
+  if (awayDays.value >= 14 && !greetedBack) {
+    greetedBack = true
+    return { ...base, situation: 'home.back', n: awayDays.value }
+  }
+  // 这节课做完了或者没课：从别的数据里挑能说的，每点一次随机说一件，点几下听到的不一样
+  const extras = extraGuides(random)
+  return extras.length ? extras[Math.floor(Math.random() * extras.length)]! : base
+})
+
+const DAY_MS = 864e5
+
+function extraGuides(random: MascotAction): MascotGuide[] {
+  const list: MascotGuide[] = []
+
+  // 比赛：进行中，或者 24 小时内开始（那就只可能是今天或明天）
+  const now = Date.now()
+  const contest = contests.value.find((it) => it.status === ContestStatus.underway || Date.parse(it.startTime) - now < DAY_MS)
+  if (contest) {
+    const when = contest.status === ContestStatus.underway ? '现在' : dayKey(contest.startTime) === dayKey(new Date()) ? '今天' : '明天'
+    list.push({ situation: 'home.contestSoon', vars: { when }, actions: [goAction(router, '去看看', `/contest/${contest.id}`), random] })
+  }
+
+  // 公告：三天内发的，挑最新那条
+  const fresh = announcements.value.filter((it) => now - Date.parse(it.createTime) < 3 * DAY_MS).sort((a, b) => b.createTime.localeCompare(a.createTime))[0]
+  if (fresh) {
+    list.push({
+      situation: 'home.newAnnouncement',
+      actions: [{ label: '去看看', run: () => router.push({ path: '/announcement', query: { id: fresh.id } }) }, random],
+    })
+  }
+
+  // 知识点：和首页那一行同一个先后（本周升级 > 离下一档最近 > 班里在学、自己还没碰过），只说一件
+  const map = knowledge.value
+  if (map) {
+    const touched = new Set(map.classTouched)
+    const go = (name: string) => ({ label: '去做', run: () => router.push(tagLink(name)) })
+    const upgraded = map.tags.filter((tag) => tag.level > tag.levelAtWeekStart).sort((a, b) => b.level - a.level)[0]
+    const learning = map.tags
+      .filter((tag) => tag.level >= 1 && tag.level < MAX_LEVEL)
+      .sort((a, b) => Number(touched.has(b.name)) - Number(touched.has(a.name)) || remainingToNext(a)! - remainingToNext(b)!)[0]
+    const untouched = map.tags.find((tag) => tag.level === 0 && touched.has(tag.name))
+    if (upgraded)
+      list.push({ situation: 'home.knowledgeUp', vars: { tag: upgraded.name, level: levelName(upgraded.level) }, actions: [go(upgraded.name), random] })
+    else if (learning)
+      list.push({
+        situation: 'home.knowledgeNext',
+        n: remainingToNext(learning)!,
+        vars: { tag: learning.name, level: levelName(learning.level + 1) },
+        actions: [go(learning.name), random],
+      })
+    else if (untouched) list.push({ situation: 'home.knowledgeFresh', vars: { tag: untouched.name }, actions: [go(untouched.name), random] })
+  }
+
+  // 本周进步榜：第一就说第一；前一名在榜面上（只回前几名）、差得不多就报还要几道。
+  // 同分时提交少的在前，追平不一定超得过，所以按多做 1 道算
+  const me = weekly.value?.me
+  if (me) {
+    const rank = goAction(router, '去排名', '/rank?period=week')
+    const ahead = weekly.value!.results.find((row) => row.rank === me.rank - 1)
+    if (me.rank === 1) list.push({ situation: 'rank.top', actions: [rank, random] })
+    else if (ahead && ahead.solvedCount - me.solvedCount <= 5)
+      list.push({ situation: 'rank.gap', n: ahead.solvedCount - me.solvedCount + 1, actions: [rank, random] })
+  }
+  return list
+}
+
 function learnLink(track: Track) {
   return tutorialPath(track.type, track.step)
 }

apps/web/src/oj/home/teacher.vue

@@ -6,6 +6,7 @@ import { useThemeVars } from 'naive-ui'
 import { getAnnouncementList, getClassToday } from 'oj/api'
 import { classLabel } from 'utils/classes'
 import { useUserStore } from 'shared/store/user'
+import { goAction, useMascotGuide } from 'shared/mascot/guide'
 import { parseTime, zonedParts, zonedYear } from 'utils/functions'
 
 /**
@@ -66,6 +67,32 @@ function openTask(row: ClassRow) {
   router.push({ name: 'task', query: { className: row.className } })
 }
 
+/**
+ * 看板娘：今天有班布置了题，就带去那个班这节课的提交（和提交列表「这节课」同一组筛选：班、这几道题、今天），
+ * 有好几个班时挑正在上课的那个
+ */
+useMascotGuide(() => {
+  if (!today.value) return null
+  const assigned = today.value.classes.filter((row) => row.source === 'teacher' && row.problems.length)
+  const row = assigned.find((it) => stateOf(it).live) ?? assigned[0]
+  if (!row) return { situation: 'teacher.home.unassigned', actions: [goAction(router, '布置题目', '/task')] }
+  const query = { className: row.className, problem: row.problems.map((problem) => problem.problemDisplayId).join(','), today: '1' }
+  // 有人交过了就说这节课做完几个，还没人交就照旧那几句
+  const progress = row.activeCount
+    ? {
+        situation: row.allDoneCount >= row.rosterCount ? ('teacher.home.progressDone' as const) : ('teacher.home.progress' as const),
+        vars: { cls: classLabel(row.className), done: row.allDoneCount, total: row.rosterCount, left: row.rosterCount - row.allDoneCount },
+      }
+    : { situation: 'teacher.home.assigned' as const }
+  return {
+    ...progress,
+    actions: [
+      { label: '这节课的提交', run: () => router.push({ name: 'submissions', query }) },
+      { label: '课堂任务', run: () => openTask(row) },
+    ],
+  }
+})
+
 const shortcuts = computed(() =>
   [
     { label: '课堂任务', to: '/task', show: true },

apps/web/src/oj/learn/index.vue

@@ -6,6 +6,7 @@ import { useBreakpoints } from 'shared/composables/breakpoints'
 import { useAuthModalStore } from 'shared/store/authModal'
 import AdminLink from 'shared/components/AdminLink.vue'
 import { useUserStore } from 'shared/store/user'
+import { goAction, useMascotGuide } from 'shared/mascot/guide'
 import { COURSES, continueStep, doneCount, groupByProject, tutorialPath, tutorialState, splitProject, splitTitle, type TutorialType } from './utils'
 import TutorialRow from './components/TutorialRow.vue'
 import ProjectTile from './components/ProjectTile.vue'
@@ -94,6 +95,23 @@ function doneIn(course: Course, ids: number[]) {
   return ids.filter((id) => tutorialState(course.progress[id]) === 'done').length
 }
 
+// 看板娘：学过就带去「接着学」那一课，一课没学过就从当前页签那门课的第 1 课开始
+useMascotGuide(() => {
+  if (!loaded.value || userStore.isTeacherOrAbove) return null
+  const it = resume.value
+  if (it) {
+    const next = goAction(router, '接着学', tutorialPath(it.course.type, it.step))
+    // 接着学的那课之前，离它最近的一课打开过、练一练却没全对（「在学」那一态）：先叫回去看看
+    const { titles, progress } = it.course
+    for (let step = it.step - 1; step >= 1; step--) {
+      if (tutorialState(progress[titles[step - 1]!.id]) !== 'started') continue
+      return { situation: 'learn.wrongExercise', n: step, actions: [goAction(router, '去看看', tutorialPath(it.course.type, step)), next] }
+    }
+    return { situation: 'learn.continue', n: it.step, actions: [next] }
+  }
+  return { situation: 'learn.fresh', actions: [goAction(router, '第 1 课', tutorialPath(tab.value, 1))] }
+})
+
 watch(() => userStore.isAuthed, load)
 onMounted(load)
 </script>

apps/web/src/oj/learn/tutorial.vue

@@ -10,6 +10,7 @@ import { useBackClose } from 'shared/composables/backClose'
 import { useBreakpoints } from 'shared/composables/breakpoints'
 import AdminLink from 'shared/components/AdminLink.vue'
 import { useUserStore } from 'shared/store/user'
+import { useMascotGuide, type MascotAction } from 'shared/mascot/guide'
 import { COURSES, doneCount, groupByProject, tutorialPath, tutorialState, splitTitle, type TutorialType } from './utils'
 import TutorialBody from './components/TutorialBody.vue'
 import TutorialEnd from './components/TutorialEnd.vue'
@@ -233,6 +234,16 @@ function jump(id: string) {
 function jumpExercise(id: number) {
   jump(`exercise-${id}`)
 }
+
+// 看板娘：练一练没做完就带去第一道没做对的；做完了（或这课没有练一练）就去下一课
+useMascotGuide(() => {
+  if (!tutorial.value || userStore.isTeacherOrAbove) return null
+  const to = next.value?.to
+  const nextLesson: MascotAction[] = to ? [{ label: '下一课', run: () => router.push(to) }] : []
+  const unsolved = firstUnsolved.value
+  if (!unsolved) return { situation: 'tutorial.passed', actions: nextLesson }
+  return { situation: 'tutorial', actions: [{ label: '练一练', run: () => jumpExercise(unsolved.id) }, ...nextLesson] }
+})
 </script>
 
 <template>

apps/web/src/oj/pk/index.vue

@@ -6,6 +6,7 @@ import { classLabel, groupClassOptions } from 'utils/classes'
 import { useAIStream } from 'shared/composables/aiStream'
 import { useBreakpoints } from 'shared/composables/breakpoints'
 import { useUserStore } from 'shared/store/user'
+import { useMascotGuide } from 'shared/mascot/guide'
 import PkDuel from './components/PkDuel.vue'
 import PkGrid from './components/PkGrid.vue'
 import PkRace from './components/PkRace.vue'
@@ -31,6 +32,10 @@ const { isDesktop } = useBreakpoints()
 const MAX_CLASSES = 8
 
 const teacher = computed(() => userStore.isTeacherOrAbove)
+
+// 看板娘：学生念叨一句班级对决，老师只打招呼
+useMascotGuide(() => (teacher.value ? null : { situation: 'pk' }))
+
 const pk = ref<ClassPk | null>(null)
 const loading = ref(false)
 const battle = ref<ClassBattleItem[]>([])

apps/web/src/oj/problem/components/CaseBlocks.vue

@@ -71,8 +71,8 @@ const label = computed(() => {
 }
 
 .block {
-  width: 20px;
-  height: 20px;
+  width: 22px;
+  height: 22px;
   border-radius: 4px;
   box-sizing: border-box;
   display: inline-flex;

apps/web/src/oj/problem/components/CompileErrorExplain.vue

@@ -6,6 +6,7 @@ import { applyFixes, clearErrorMark, currentCode, showErrorMark, showPunctuation
 import { explainCCompileError } from 'oj/problem/utils/cError'
 import { explainPythonCompileError } from 'utils/pythonError'
 import { stripJudgePath } from 'utils/judge'
+import SectionHead from './SectionHead.vue'
 
 /**
  * 编译错误的中文说明卡片：Python 的语法错误走 pythonError.ts，C / C++ 的 gcc 报错走
@@ -80,17 +81,17 @@ onUnmounted(clearErrorMark)
 </script>
 
 <template>
-  <div class="explain-card">
+  <!-- 设计稿「题目页观感」结果 X：黄色小节标题说第几行，正文大小的中文说明；那一行编辑器里已经标红了 -->
+  <div class="explain-section">
     <template v-if="explanation">
-      <p class="explain">
-        <b v-if="explanation.line">第 {{ explanation.line }} 行：</b>{{ explanation.message }}
-      </p>
+      <SectionHead icon="problem" tone="amber">{{ explanation.line ? `第 ${explanation.line} 行` : '代码的格式写错了' }}</SectionHead>
+      <p class="explain">{{ explanation.message }}</p>
       <p v-if="otherPunctuationLines.length" class="explain other">第 {{ otherPunctuationLines.join('、') }} 行也有中文标点，编辑器里都标出来了。</p>
-      <div v-if="explanation.punctuation">
+      <div v-if="explanation.punctuation" class="fix">
         <n-button v-if="punctuationFixCount" type="primary" @click="fixPunctuation"> 把中文标点都换成英文（{{ punctuationFixCount }} 处） </n-button>
         <n-text v-else-if="fixedCount" type="success"> 换好了 {{ fixedCount }} 处，再提交一次试试。 </n-text>
       </div>
-      <n-collapse>
+      <n-collapse class="raw-collapse">
         <n-collapse-item title="原始报错（英文）" name="raw">
           <div class="raw">{{ rawError }}</div>
         </n-collapse-item>
@@ -98,6 +99,7 @@ onUnmounted(clearErrorMark)
     </template>
     <!-- 翻译表没覆盖到的句式（生产数据里约 0.3%）：照旧给原文 -->
     <template v-else>
+      <SectionHead icon="problem" tone="amber">代码的格式写错了</SectionHead>
       <p class="explain">请仔细检查，看看代码的格式是不是写错了！</p>
       <div class="raw">{{ rawError }}</div>
     </template>
@@ -105,20 +107,15 @@ onUnmounted(clearErrorMark)
 </template>
 
 <style scoped>
-/* 和答错的说明同一种浅灰卡片（设计稿「语法没过」） */
-.explain-card {
-  padding: 12px 14px;
-  border-radius: 6px;
-  background-color: rgba(128, 128, 128, 0.06);
-  border: 1px solid v-bind('theme.dividerColor');
+.explain-section {
   display: flex;
   flex-direction: column;
-  gap: 10px;
 }
 
 .explain {
-  margin: 0;
-  line-height: 1.7;
+  margin: 0 0 10px;
+  font-size: 16px;
+  line-height: 1.75;
 }
 
 .explain.other {
@@ -126,6 +123,10 @@ onUnmounted(clearErrorMark)
   color: v-bind('theme.textColor2');
 }
 
+.fix {
+  margin-bottom: 10px;
+}
+
 .raw {
   white-space: pre;
   overflow-x: auto;

apps/web/src/oj/problem/components/ContextBar.vue

@@ -1,4 +1,5 @@
 <script setup lang="ts">
+import { Icon } from '@iconify/vue'
 import { storeToRefs } from 'pinia'
 import type { RouteLocationRaw } from 'vue-router'
 import { getProblemSetDetail, getProblemSetProblems, joinProblemSet } from 'oj/api'
@@ -33,15 +34,16 @@ const ctx = useProblemPageContext()
 const { isMobile } = useBreakpoints()
 const theme = useThemeVars()
 const isDark = useDark()
+/** 做完的实心绿圈里的勾：暗色下主题绿很亮，白勾看不清 */
+const doneDotText = computed(() => (isDark.value ? 'rgba(0, 0, 0, 0.85)' : '#fff'))
 
 /**
- * 三种入口各一种底色（设计稿「上下文条与协作状态」）：课堂浅绿、专题浅蓝、比赛浅黄。
+ * 课堂、比赛在电脑上是左边的竖栏（课堂浅绿底、比赛浅黄底），专题是一条不带底色的细横条；
+ * 手机上三种都是横条（课堂浅绿、比赛浅黄）。
  * 字色在暗色下换成浅一档的，深绿、深蓝、深黄放在暗底上看不清
  */
 const tone = computed(() => ({
   lessonText: isDark.value ? theme.value.primaryColor : theme.value.primaryColorPressed,
-  setText: isDark.value ? '#8fb4ee' : '#1d4f9c',
-  setBar: isDark.value ? '#6f9be0' : '#2f6bc4',
   contestText: isDark.value ? '#f2c97d' : '#8a5200',
 }))
 const userStore = useUserStore()
@@ -241,8 +243,35 @@ onSolvedHere(() => {
 </script>
 
 <template>
-  <!-- 课堂 -->
-  <div v-if="lesson" class="context-bar lesson">
+  <!--
+    课堂（电脑）：左栏最左边一条竖栏，只写题号，题名鼠标停上去看（学生认题靠题号）。
+    不占高度：机房 1366×768 那种屏，顶上每省一行，题面和编辑器就多一行（设计稿「题目页观感」合一版）
+  -->
+  <nav v-if="lesson && !isMobile" class="lesson-rail" aria-label="这节课的题">
+    <div class="rail-head">
+      <span>这节课</span>
+      <b class="rail-done">{{ lesson.done }}/{{ lesson.total }}</b>
+      <span v-if="lessonStore.languageText" class="rail-lang">{{ lessonStore.languageText }}</span>
+    </div>
+    <router-link
+      v-for="(chip, index) in lesson.chips"
+      :key="chip.displayId"
+      :to="chip.to"
+      class="rail-item"
+      :class="[chip.status, { current: chip.displayId.toLowerCase() === currentId.toLowerCase() }]"
+      :title="chip.note ? `${chip.title}（${chip.note}）` : chip.title"
+      :aria-current="chip.displayId.toLowerCase() === currentId.toLowerCase() ? 'page' : undefined"
+    >
+      <span class="rail-dot">
+        <Icon v-if="chip.status === 'done'" icon="ph:check-bold" :width="14" />
+        <template v-else>{{ index + 1 }}</template>
+      </span>
+      <span class="rail-id">{{ chip.displayId }}</span>
+    </router-link>
+  </nav>
+
+  <!-- 课堂（手机）：一条横的 -->
+  <div v-else-if="lesson" class="context-bar lesson">
     <span class="lead lesson-lead"
       >这节课<template v-if="lessonStore.languageText"> · {{ lessonStore.languageText }}</template> 做完 {{ lesson.done }}/{{ lesson.total }}</span
     >
@@ -356,7 +385,37 @@ onSolvedHere(() => {
     </component>
   </div>
 
-  <!-- 比赛 -->
+  <!--
+    比赛（电脑）：和课堂一样是左边一条竖栏 —— 比赛一般 3 到 10 道题，题号一列摆得下。
+    顶上「‹ 比赛」回比赛页（比赛名鼠标停上去看）、还剩多久；底下「排名」（期中期末进行中不给）
+  -->
+  <nav v-else-if="contestBar && !isMobile" class="lesson-rail contest-rail" aria-label="比赛的题">
+    <router-link :to="contestBar.home" class="rail-back" :title="`回到比赛：${contestBar.title}`">
+      <Icon icon="ph:caret-left-bold" :width="12" aria-hidden="true" />比赛
+    </router-link>
+    <div class="rail-head">
+      <template v-if="contestBar.remaining">
+        <span>还剩</span>
+        <b class="rail-time">{{ contestBar.remaining }}</b>
+      </template>
+      <span v-else>{{ contestBar.notStarted ? '还没开始' : '已结束' }}</span>
+    </div>
+    <router-link
+      v-for="chip in contestBar.chips"
+      :key="chip.displayId"
+      :to="chip.to"
+      class="rail-item"
+      :class="[chip.status, { current: chip.displayId.toLowerCase() === currentId.toLowerCase() }]"
+      :title="chip.title"
+      :aria-current="chip.displayId.toLowerCase() === currentId.toLowerCase() ? 'page' : undefined"
+    >
+      <!-- 比赛题号本来就短（1、2、A），直接写在圈里；做对了圈涂绿、号还在，认得出是哪道 -->
+      <span class="rail-dot">{{ chip.displayId }}</span>
+    </router-link>
+    <router-link v-if="contestBar.rank" :to="contestBar.rank" class="rail-rank"> <Icon icon="ph:ranking" :width="18" aria-hidden="true" />排名 </router-link>
+  </nav>
+
+  <!-- 比赛（手机） -->
   <div v-else-if="contestBar" class="context-bar contest">
     <router-link :to="contestBar.home" class="back contest-back" :title="`回到比赛：${contestBar.title}`"> ‹ {{ contestBar.title }} </router-link>
     <ProblemChips :items="contestBar.chips" :current="currentId" variant="contest" />
@@ -371,6 +430,165 @@ onSolvedHere(() => {
 </template>
 
 <style scoped>
+/* 比赛竖栏：浅黄底，和课堂分得开 */
+.contest-rail {
+  background-color: rgba(208, 138, 28, 0.07);
+  border-right-color: rgba(208, 138, 28, 0.2);
+}
+
+.contest-rail .rail-item:hover {
+  background-color: rgba(208, 138, 28, 0.1);
+}
+
+.contest-rail .rail-dot {
+  font-size: 12px;
+  overflow: hidden;
+}
+
+.rail-back {
+  display: flex;
+  align-items: center;
+  justify-content: center;
+  gap: 1px;
+  margin-bottom: 4px;
+  font-size: 12px;
+  font-weight: 600;
+  color: v-bind('tone.contestText');
+  text-decoration: none;
+}
+
+.rail-back:hover {
+  text-decoration: underline;
+}
+
+.rail-time {
+  font-size: 12px;
+  font-variant-numeric: tabular-nums;
+  color: v-bind('tone.contestText');
+}
+
+.rail-rank {
+  margin-top: auto;
+  padding: 8px 0 2px;
+  display: flex;
+  flex-direction: column;
+  align-items: center;
+  gap: 2px;
+  font-size: 12px;
+  color: v-bind('theme.textColor2');
+  text-decoration: none;
+}
+
+.rail-rank:hover {
+  color: v-bind('tone.contestText');
+}
+
+/* ==================== 课堂竖栏（电脑） ==================== */
+.lesson-rail {
+  width: 56px;
+  flex: none;
+  box-sizing: border-box;
+  padding: 8px 0;
+  display: flex;
+  flex-direction: column;
+  align-items: stretch;
+  gap: 2px;
+  overflow-y: auto;
+  scrollbar-width: none;
+  background-color: rgba(24, 160, 88, 0.06);
+  border-right: 1px solid rgba(24, 160, 88, 0.14);
+}
+
+.rail-head {
+  display: flex;
+  flex-direction: column;
+  align-items: center;
+  margin-bottom: 6px;
+  font-size: 11px;
+  line-height: 1.35;
+  color: v-bind('theme.textColor3');
+}
+
+.rail-done {
+  font-size: 12px;
+  font-variant-numeric: tabular-nums;
+  color: v-bind('tone.lessonText');
+}
+
+.rail-lang {
+  max-width: 52px;
+  overflow: hidden;
+  text-overflow: ellipsis;
+}
+
+.rail-item {
+  display: flex;
+  flex-direction: column;
+  align-items: center;
+  gap: 3px;
+  padding: 7px 0;
+  font-size: 12px;
+  font-weight: 500;
+  font-variant-numeric: tabular-nums;
+  color: v-bind('theme.textColor2');
+  text-decoration: none;
+}
+
+.rail-item:hover {
+  background-color: rgba(24, 160, 88, 0.08);
+}
+
+.rail-item.current {
+  font-weight: 700;
+  color: v-bind('tone.lessonText');
+  background-color: v-bind('theme.bodyColor');
+  box-shadow: inset 3px 0 v-bind('theme.primaryColor');
+}
+
+.rail-id {
+  max-width: 52px;
+  overflow: hidden;
+  text-overflow: ellipsis;
+  white-space: nowrap;
+}
+
+.rail-dot {
+  width: 28px;
+  height: 28px;
+  box-sizing: border-box;
+  border-radius: 50%;
+  display: flex;
+  align-items: center;
+  justify-content: center;
+  font-size: 13px;
+  font-weight: 700;
+  border: 1.5px solid rgba(128, 128, 128, 0.4);
+  background-color: v-bind('theme.bodyColor');
+  color: v-bind('theme.textColor2');
+}
+
+.done .rail-dot {
+  border-color: v-bind('theme.successColor');
+  background-color: v-bind('theme.successColor');
+  color: v-bind('doneDotText');
+}
+
+/* 做过没对：红圈，和题目列表的红「−」一个意思 */
+.tried .rail-dot {
+  border-color: v-bind('theme.errorColor');
+  color: v-bind('theme.errorColor');
+}
+
+.current .rail-dot {
+  border-width: 2px;
+  border-color: v-bind('theme.primaryColor');
+  color: v-bind('tone.lessonText');
+}
+
+.current.done .rail-dot {
+  color: v-bind('doneDotText');
+}
+
 .context-bar {
   height: 44px;
   flex: none;
@@ -390,10 +608,12 @@ onSolvedHere(() => {
   border-bottom-color: rgba(24, 160, 88, 0.18);
 }
 
+/* 专题：不带底色的一条细横条（设计稿「题目页观感」合一版）。专题可以有几十道题、还有「加入专题」，
+   竖栏放不下，留在页签行上面 */
 .problemset {
+  height: 40px;
   gap: 10px;
-  background-color: rgba(47, 107, 196, 0.06);
-  border-bottom-color: rgba(47, 107, 196, 0.16);
+  border-bottom-color: v-bind('theme.dividerColor');
 }
 
 .contest {
@@ -437,7 +657,7 @@ onSolvedHere(() => {
 }
 
 .set-back {
-  color: v-bind('tone.setText');
+  color: v-bind('theme.textColor1');
 }
 
 /* 比赛名不跟题号那段抢地方：题号多了本来就能横向滚，名字挤成两个字就认不出了 */
@@ -452,14 +672,14 @@ onSolvedHere(() => {
   width: 110px;
   height: 6px;
   border-radius: 3px;
-  background-color: rgba(47, 107, 196, 0.16);
+  background-color: rgba(128, 128, 128, 0.16);
   overflow: hidden;
 }
 
 .set-progress-fill {
   height: 100%;
   border-radius: 3px;
-  background-color: v-bind('tone.setBar');
+  background-color: v-bind('theme.primaryColor');
 }
 
 .countdown {
@@ -503,7 +723,7 @@ onSolvedHere(() => {
 }
 
 .problemset .step.forward {
-  color: v-bind('tone.setText');
+  color: v-bind('theme.textColor1');
 }
 
 .step:not(.disabled):hover {

apps/web/src/oj/problem/components/CustomRun.vue

@@ -1,4 +1,6 @@
 <script setup lang="ts">
+import { Icon } from '@iconify/vue'
+import SectionHead from './SectionHead.vue'
 import { useThemeVars } from 'naive-ui'
 import { storeToRefs } from 'pinia'
 import { useCodeStore } from 'oj/store/code'
@@ -29,7 +31,7 @@ function fillSample(input: string) {
 <template>
   <!-- 设计稿「自己输入：顶替原来的『自测』模式」；「这里不判对错」在分段那一行右边（ResultPane） -->
   <div class="custom">
-    <span class="label">输入</span>
+    <SectionHead icon="input">输入</SectionHead>
     <n-input
       v-model:value="customInput"
       type="textarea"
@@ -38,15 +40,16 @@ function fillSample(input: string) {
       class="mono"
     />
     <div class="actions">
-      <n-button type="primary" ghost :loading="customRunning" :disabled="!codeStore.code.value.trim()" @click="submissionStore.runCustom()">
+      <n-button type="primary" secondary :loading="customRunning" :disabled="!codeStore.code.value.trim()" @click="submissionStore.runCustom()">
+        <template #icon><Icon icon="ph:play-fill" /></template>
         用这组数据运行
       </n-button>
-      <n-button v-for="(sample, index) in problem?.samples ?? []" :key="index" text class="fill" @click="fillSample(sample.input)">
+      <n-button v-for="(sample, index) in problem?.samples ?? []" :key="index" text type="primary" class="fill" @click="fillSample(sample.input)">
         填入例子 {{ index + 1 }}
       </n-button>
     </div>
 
-    <span class="label">输出</span>
+    <SectionHead icon="output" class="output-head">输出</SectionHead>
     <TrialErrorNote
       v-if="customResult !== null && customResult !== SubmissionStatus.accepted"
       :result="customResult"
@@ -68,13 +71,14 @@ function fillSample(input: string) {
   gap: 8px;
 }
 
-.label {
-  font-size: 13px;
-  font-weight: 600;
+.output-head {
+  margin-top: 14px;
 }
 
 .mono :deep(textarea) {
   font-family: Consolas, Monaco, monospace;
+  font-size: 16px;
+  line-height: 24px;
 }
 
 .actions {
@@ -85,13 +89,12 @@ function fillSample(input: string) {
 }
 
 .fill {
-  font-size: 13px;
-  color: v-bind('theme.textColor2');
+  font-size: 14px;
 }
 
 .output {
   margin: 0;
-  min-height: 88px;
+  min-height: 60px;
   box-sizing: border-box;
   padding: 10px 10px;
   border-radius: 6px;
@@ -99,7 +102,9 @@ function fillSample(input: string) {
   white-space: pre-wrap;
   word-break: break-all;
   font-family: Consolas, Monaco, monospace;
-  font-size: 14px;
+  font-size: 16px;
+  line-height: 24px;
+  border: 1px solid rgba(128, 128, 128, 0.14);
 }
 
 .output.empty {

apps/web/src/oj/problem/components/EditorToolbar.vue

@@ -182,7 +182,9 @@ const changeLanguage = (v: LANGUAGE) => {
     <n-select
       v-if="!drawing"
       v-model:value="codeStore.code.language"
+      class="language"
       style="width: 120px"
+      :bordered="false"
       :size="buttonSize"
       :options="languageOptions"
       :disabled="showCollabBar"
@@ -190,15 +192,19 @@ const changeLanguage = (v: LANGUAGE) => {
     />
 
     <!-- 手机上「运行例子」「提交」在屏幕底部那条（MobileActionBar），三个页签都在 -->
+    <span v-if="!drawing" class="divider" aria-hidden="true" />
+
+    <!-- 浅绿底：比实心的「提交」轻一档，又比旁边不带框的按钮重（设计稿「题目页观感」合一版） -->
     <n-button
       v-if="canRunSamples && isDesktop"
       :size="buttonSize"
       type="primary"
-      ghost
+      secondary
       :loading="samplesRunning"
       :disabled="!codeStore.code.value.trim()"
       @click="submissionStore.runSamples()"
     >
+      <template #icon><Icon icon="ph:play-fill" /></template>
       运行例子
     </n-button>
 
@@ -215,22 +221,26 @@ const changeLanguage = (v: LANGUAGE) => {
       :size="buttonSize"
       :type="helpButtonType"
       :secondary="teacherIn || collabStore.helpStatus !== 'idle'"
+      :quaternary="!teacherIn && collabStore.helpStatus === 'idle'"
       :title="helpButtonTitle"
       class="help"
       :class="{ busy: teacherIn }"
       @click="toggleHelp"
     >
       <span v-if="teacherIn" class="dot" aria-hidden="true" />
+      <Icon v-else-if="collabStore.helpStatus === 'idle'" icon="ph:hand" :width="17" class="help-icon" aria-hidden="true" />
       {{ helpButtonText }}
     </n-button>
 
-    <n-button v-if="ctx.classStats && statisticsInline && userStore.isTeacherOrAbove" :size="buttonSize" @click="openStatistics(problem!._id)">
+    <n-button v-if="ctx.classStats && statisticsInline && userStore.isTeacherOrAbove" :size="buttonSize" quaternary @click="openStatistics(problem!._id)">
       课堂统计
     </n-button>
 
     <!-- 自测猫 / 复制代码 / 重置代码 / 编辑题目 收进下拉菜单；放不下时再加上课堂统计 -->
     <n-dropdown v-if="isDesktop && menuOptions.length" trigger="click" :options="menuOptions" @select="handleMenuSelect">
-      <n-button :size="buttonSize" class="more" aria-label="更多：去自测猫、复制代码、重置代码……"> ⋯ </n-button>
+      <n-button :size="buttonSize" quaternary class="more" aria-label="更多：去自测猫、复制代码、重置代码……">
+        <Icon icon="ph:dots-three-bold" :width="18" />
+      </n-button>
     </n-dropdown>
   </div>
 </template>
@@ -288,6 +298,23 @@ const changeLanguage = (v: LANGUAGE) => {
   padding: 0;
 }
 
+/* 语言选择不带框，字加粗：它不是一个要常去点的按钮 */
+.language :deep(.n-base-selection-label) {
+  font-weight: 600;
+}
+
+.divider {
+  flex: none;
+  width: 1px;
+  height: 20px;
+  margin: 0 2px;
+  background-color: v-bind('theme.dividerColor');
+}
+
+.help-icon {
+  margin-right: 4px;
+}
+
 .help.busy {
   cursor: default;
 }

apps/web/src/oj/problem/components/LessonNext.vue

@@ -1,4 +1,5 @@
 <script setup lang="ts">
+import SectionHead from './SectionHead.vue'
 import { useThemeVars } from 'naive-ui'
 import { useLessonStore } from 'shared/store/lesson'
 import ChallengeList from './ChallengeList.vue'
@@ -44,16 +45,17 @@ const lessonProblemIds = computed(() => lessonStore.activity?.problems.map((item
 </script>
 
 <template>
-  <!-- 设计稿「答案正确：下一题在结果页签里」：浅绿卡片，一个 44px 的大按钮 -->
-  <div v-if="lesson" class="lesson-next">
+  <!--
+    设计稿「题目页观感」结果 X：「接着做」一节，一句话说还剩几道，一个 44px 的大按钮写下一题。
+    原来是一张浅绿卡片：左边竖栏已经有这节课的进度，不用再框一块
+  -->
+  <section v-if="lesson" class="lesson-next">
+    <SectionHead icon="next">接着做</SectionHead>
     <template v-if="lesson.next">
-      <div class="text">
-        <span class="headline">{{ label }}还剩 {{ lesson.remaining }} 道</span>
-        <span class="detail">
-          {{ lesson.next.problemDisplayId }}
-          {{ lesson.next.myStatus === 'tried' ? '你做过，还没对' : '你还没做过' }}
-        </span>
-      </div>
+      <p class="text">
+        {{ label }}还剩 {{ lesson.remaining }} 道，下一道 {{ lesson.next.problemDisplayId }}
+        {{ lesson.next.myStatus === 'tried' ? '你做过，还没对' : '你还没做过' }}。
+      </p>
       <router-link :to="`/problem/${lesson.next.problemDisplayId}`" class="next">
         <span class="next-label">下一题：{{ lesson.next.problemDisplayId }} {{ lesson.next.title }}</span>
         <svg
@@ -72,15 +74,12 @@ const lessonProblemIds = computed(() => lessonStore.activity?.problems.map((item
       </router-link>
     </template>
     <template v-else>
-      <div class="text">
-        <span class="headline">{{ label }}都做完了，一共 {{ lesson.total }} 道</span>
-        <span v-if="!challenges" class="detail">想接着练，可以去专题里挑一个</span>
-      </div>
+      <p class="text">{{ label }}都做完了，一共 {{ lesson.total }} 道。<template v-if="!challenges">想接着练，可以去专题里挑一个。</template></p>
       <router-link v-if="!challenges" to="/problemset" class="next secondary">
         <span class="next-label">去专题继续练</span>
       </router-link>
     </template>
-  </div>
+  </section>
   <!-- 做完了：先给这节课里还能挑战的，再给专题（设计稿 StkDone）。挑战一条都没有时只剩专题那句 -->
   <template v-if="lesson && !lesson.next && challenges">
     <ChallengeList :problem-ids="lessonProblemIds" :language="language" :refresh-key="refreshKey" />
@@ -90,30 +89,15 @@ const lessonProblemIds = computed(() => lessonStore.activity?.problems.map((item
 
 <style scoped>
 .lesson-next {
-  margin-top: 12px;
-  padding: 16px 18px;
-  border-radius: 8px;
-  background-color: rgba(24, 160, 88, 0.07);
-  border: 1px solid rgba(24, 160, 88, 0.25);
+  margin-top: 4px;
   display: flex;
   flex-direction: column;
-  gap: 12px;
 }
 
 .text {
-  display: flex;
-  flex-direction: column;
-  gap: 4px;
-}
-
-.headline {
-  font-size: 15px;
-  font-weight: 600;
-}
-
-.detail {
-  font-size: 13px;
-  color: v-bind('theme.textColor2');
+  margin: 0 0 12px;
+  font-size: 16px;
+  line-height: 1.75;
 }
 
 .next {
@@ -125,10 +109,10 @@ const lessonProblemIds = computed(() => lessonStore.activity?.problems.map((item
   gap: 8px;
   height: 44px;
   padding: 0 20px;
-  border-radius: 6px;
+  border-radius: 8px;
   background-color: v-bind('theme.primaryColor');
   color: v-bind('buttonText');
-  font-size: 15px;
+  font-size: 16px;
   font-weight: 600;
   text-decoration: none;
 }

apps/web/src/oj/problem/components/ProblemContent.vue

@@ -1,14 +1,18 @@
 <script setup lang="ts">
+import { Icon } from '@iconify/vue'
 import { isSqlProblem, parseFlowDoc } from '@oj2/contract'
 import { useThemeVars } from 'naive-ui'
 import { storeToRefs } from 'pinia'
 import { useProblemStore } from 'oj/store/problem'
 import { DIFFICULTY } from 'utils/constants'
-import { copyToClipboard, getTagColor } from 'utils/functions'
+import { getTagColor } from 'utils/functions'
 import { useSubmissionStore } from 'oj/store/submission'
 import Markdown from 'shared/components/Markdown.vue'
 import SqlProblemData from './SqlProblemData.vue'
 import SimilarProblems from './SimilarProblems.vue'
+import SampleList from './SampleList.vue'
+import SectionHead from './SectionHead.vue'
+import { tidyStatement } from '../utils/statement'
 import { isFlowchartPass, useFlowchartStore } from 'oj/store/flowchart'
 import { useMyFlowchartStore } from 'shared/store/myFlowchart'
 import { useUserStore } from 'shared/store/user'
@@ -73,27 +77,15 @@ watch(
   () => (myFlowchartOpen.value = true),
 )
 
-/** 流程图画到 A / S 了：标题下给个「流程图 A 级」 */
+/**
+ * 标题下的「流程图 X 级」：评完过的里面最好的那一次。画到 A / S 是绿的（算做完了），
+ * 没画到是橙的 —— 原来只在 A / S 时才写，画到 C 的学生标题下是「还没交过」，像是什么都没交
+ */
 const flowchartGrade = computed(() => {
-  const passed = flowchartStore.scores.filter((row) => isFlowchartPass(row.grade))
-  if (!passed.length) return ''
-  return passed.some((row) => row.grade === 'S') ? 'S' : 'A'
+  const best = flowchartStore.scores.reduce<(typeof flowchartStore.scores)[number] | null>((acc, row) => (!acc || row.score > acc.score ? row : acc), null)
+  return best?.grade ?? ''
 })
-
-// 例子旁的「复制」：点完变成「已复制」一秒
-const message = useMessage()
-const copiedKey = ref('')
-const { start: resetCopied } = useTimeoutFn(() => (copiedKey.value = ''), 1000, {
-  immediate: false,
-})
-async function copySample(key: string, text: string) {
-  if (await copyToClipboard(text)) {
-    copiedKey.value = key
-    resetCopied()
-  } else {
-    message.error('复制失败')
-  }
-}
+const flowchartPassed = computed(() => isFlowchartPass(flowchartGrade.value))
 
 // 这道题能画流程图，就去查画到 A/S 没有 —— 原来要先切到「流程图」这门「语言」才查。
 // 不看 canDraw：手机上画不了，但以前在电脑上画好的那张照样该摆出来
@@ -105,140 +97,96 @@ watch(
   { immediate: true },
 )
 
-// 例子只是摆出来。原来每个例子旁有个「测试」按钮（结果只给通过 / 不通过、2 秒后复位），
-// 现在试跑统一走工具栏的「运行例子」和结果页签的「自己输入」
+// 例子只是摆出来（SampleList）。试跑统一走工具栏的「运行例子」和结果页签的「自己输入」
 const samples = computed(() => problem.value?.samples ?? [])
 const submissionStore = useSubmissionStore()
 
-const SAMPLE_SIDES = ['input', 'output'] as const
-const SAMPLE_SIDE_LABEL = { input: '输入', output: '输出' } as const
-
-/*
- * 例子默认摆成「例子 N | 输入 | 输出」的表，可机房那两种屏上左栏只有 550px 左右，每格只放得下
- * 二十来个字符，而例子输出最长那行的 p90 就有 28 个字符宽（中文按两个算）—— 一成的题会在
- * 半格里横着滚。所以按这道题最长那行量一下：半格放得下就摆表，放不下这道题的例子就整体改成
- * 上下排（输入一行、输出一行，各占满宽）。整宽还放不下的二十来道才横着滚。不自动折行：折出来
- * 的行学生分不清是不是真换了行，照着它输出就错了。
- * 下面几个尺寸 CSS 里也用（v-bind），量宽度和排版是同一套数。
- */
-const SAMPLE_FONT = '14px Consolas, Monaco, monospace'
-const SAMPLE_NO_W = 56
-const SAMPLE_GAP = 8
-const SAMPLE_PAD_L = 10
-const SAMPLE_PAD_R = 4
-const SAMPLE_COPY_W = 44
-const sampleCss = {
-  font: SAMPLE_FONT,
-  noW: `${SAMPLE_NO_W}px`,
-  gap: `${SAMPLE_GAP}px`,
-  pad: `2px ${SAMPLE_PAD_R}px 2px ${SAMPLE_PAD_L}px`,
-  copyW: `${SAMPLE_COPY_W}px`,
-}
-
-let measureCtx: CanvasRenderingContext2D | null = null
-/** 例子里最长那一行排出来有多宽（px）。等宽字体里中文、表情照样比英文宽，所以按字体真量 */
-const sampleTextWidth = computed(() => {
-  measureCtx ??= document.createElement('canvas').getContext('2d')
-  if (!measureCtx) return 0
-  measureCtx.font = SAMPLE_FONT
-  let widest = 0
-  for (const sample of samples.value) {
-    for (const side of SAMPLE_SIDES) {
-      for (const line of sample[side].split('\n')) {
-        // <pre> 里 tab 按 8 列排
-        const width = measureCtx.measureText(line.replace(/\t/g, '        ')).width
-        if (width > widest) widest = width
-      }
-    }
-  }
-  return widest
-})
-
-const sampleTable = useTemplateRef<HTMLElement>('sampleTable')
-const { width: sampleTableWidth } = useElementSize(sampleTable)
-/**
- * 窄（手机，或桌面左栏拖到最窄）：「例子 N」不占一列，改成每个例子头上一行小字。
- * 390 宽的手机上那一列连同间距要吃掉 64px，框只剩一半多
- */
-const sampleNarrow = computed(() => sampleTableWidth.value > 0 && sampleTableWidth.value < 480)
-/** 摆成表时，半格里留给文字的宽度 */
-const sampleHalfWidth = computed(
-  () => (sampleTableWidth.value - (sampleNarrow.value ? 0 : SAMPLE_NO_W + SAMPLE_GAP) - SAMPLE_GAP) / 2 - SAMPLE_PAD_L - SAMPLE_PAD_R - SAMPLE_COPY_W,
-)
-const samplesStacked = computed(() => sampleTableWidth.value > 0 && sampleTextWidth.value > sampleHalfWidth.value)
+/** 描述、输入、输出、提示：去掉老师为了隔开敲的空段落（见 utils/statement） */
+const statement = computed(() => ({
+  description: tidyStatement(problem.value?.description),
+  input: tidyStatement(problem.value?.inputDescription),
+  output: tidyStatement(problem.value?.outputDescription),
+  hint: tidyStatement(problem.value?.hint),
+}))
 
 // 文案和配色分类都由后端生成 —— 原来这里有一份 NODE_TARGET_LABELS +
 // ruleDescription + ruleTagType，和判题机那份几乎一模一样，见契约
 // astRequirementSchema。规则原文（engine / target）不下发给学生。
-const KIND_TAG_TYPE = {
-  require: 'success',
-  forbid: 'error',
-  count: 'info',
+// 每条规则前面一个小图标说是哪一类，规则的字照后端给的原样写（里面已经有「必须 / 不能」）
+const KIND_ICON = {
+  require: 'ph:check-circle-fill',
+  forbid: 'ph:prohibit-fill',
+  count: 'ph:hash-bold',
 } as const
 
 const astRequirements = computed(() => Object.entries(problem.value?.astRequirements ?? {}))
 </script>
-
 <template>
   <div v-if="problem" class="problem-content">
+    <!-- 题号、题名、难度和状态一行（设计稿「题目页观感」定稿）。题名太长折到下一行，标签留在右边 -->
     <header class="problem-head">
-      <div class="title-row">
-        <span class="pid">{{ problem._id }}</span>
-        <h1 class="problem-title">{{ problem.title }}</h1>
-      </div>
+      <span class="pid">{{ problem._id }}</span>
+      <h1 class="problem-title">{{ problem.title }}</h1>
       <div class="meta">
         <n-tag v-if="problem.difficulty" size="small" :bordered="false" :type="getTagColor(problem.difficulty)">
           {{ DIFFICULTY[problem.difficulty] }}
         </n-tag>
-        <n-tag v-if="myStatus === 'solved'" size="small" type="success" :bordered="false"> 已解决 </n-tag>
+        <n-tag v-if="myStatus === 'solved'" size="small" type="success" :bordered="false" class="solved"> 已解决 </n-tag>
         <!-- 流程图画到 A / S 就算做完了（决定 4）：别在「流程图 A 级」旁边再写「还没交过」
-             「做过，还没对」—— 那两个说的是代码 -->
-        <template v-else-if="!flowchartGrade">
-          <n-tag v-if="myStatus === 'tried'" size="small" type="warning" :bordered="false"> 做过，还没对 </n-tag>
-          <n-tag v-else-if="myStatus === 'none'" size="small" :bordered="false">还没交过</n-tag>
+             「做过，还没对」—— 那两个说的是代码。图没画到 A 的，代码交过没对照写；没交过代码就不写
+             「还没交过」，旁边的「流程图 C 级」已经说了交过什么。
+             「做过，还没对」用红色：橙色和「中等」撞色，两个标签挨着分不出来 -->
+        <template v-else-if="!flowchartPassed">
+          <n-tag v-if="myStatus === 'tried'" size="small" type="error" :bordered="false"> 做过，还没对 </n-tag>
+          <n-tag v-else-if="myStatus === 'none' && !flowchartGrade" size="small" :bordered="false">还没交过</n-tag>
         </template>
-        <n-tag v-if="flowchartGrade" size="small" type="success" :bordered="false"> 流程图 {{ flowchartGrade }} 级 </n-tag>
+        <n-tag v-if="flowchartGrade" size="small" :type="flowchartPassed ? 'success' : 'warning'" :bordered="false"> 流程图 {{ flowchartGrade }} 级 </n-tag>
       </div>
     </header>
 
-    <!-- 语法要求（AST 规则）放在最前面：它是硬性的判定条件，写到一半才看见就晚了 -->
-    <div v-if="astRequirements.length > 0" class="requirements">
-      <span class="requirements-head">语法要求</span>
+    <!-- 语法要求（AST 规则）放在最前面：它是硬性的判定条件，写到一半才看见就晚了。
+         黄色，和提示同色；每条一行，前面的小图标说是「必须 / 不能 / 次数」哪一类 -->
+    <section v-if="astRequirements.length > 0" class="block">
+      <SectionHead icon="rules" tone="amber">语法要求</SectionHead>
       <template v-for="[lang, rules] in astRequirements" :key="lang">
-        <span v-if="astRequirements.length > 1" class="lang-label">{{ lang }}</span>
-        <n-tag v-for="(rule, i) in rules" :key="`${lang}-${i}`" :type="KIND_TAG_TYPE[rule.kind]" size="small" :bordered="false">
-          {{ rule.description }}
-        </n-tag>
+        <div v-if="astRequirements.length > 1" class="lang-label">{{ lang }}</div>
+        <ul class="rules">
+          <li v-for="(rule, i) in rules" :key="`${lang}-${i}`" :class="rule.kind">
+            <Icon :icon="KIND_ICON[rule.kind]" :width="16" class="rule-icon" aria-hidden="true" />
+            <span>{{ rule.description }}</span>
+          </li>
+        </ul>
       </template>
-      <span class="requirements-note">提交时会逐条检查</span>
-    </div>
-
-    <section class="block">
-      <h3 class="title">描述</h3>
-      <Markdown html :content="problem.description" />
     </section>
 
-    <!-- 输入、输出一般都只有一两句，左右摆开省半屏 -->
-    <div v-if="!isSQL" class="io">
+    <section class="block">
+      <SectionHead icon="description">描述</SectionHead>
+      <Markdown html :content="statement.description" />
+    </section>
+
+    <!-- 输入、输出上下排：并排的时候多一两句就挤成窄条（2020 的输入折成三行），旁边一栏空着 -->
+    <template v-if="!isSQL">
       <section class="block">
-        <h3 class="title">输入</h3>
-        <Markdown html :content="problem.inputDescription" />
+        <SectionHead icon="input">输入</SectionHead>
+        <Markdown html :content="statement.input" />
       </section>
       <section class="block">
-        <h3 class="title">输出</h3>
-        <Markdown html :content="problem.outputDescription" />
+        <SectionHead icon="output">输出</SectionHead>
+        <Markdown html :content="statement.output" />
       </section>
-    </div>
+    </template>
 
     <!-- 自己画到 A/S 的那张：默认展开一小块，可以放大、可以收起 -->
     <section v-if="!canShowReferenceFlowchart && myFlowchartStore.showing" class="block">
-      <div class="block-head">
-        <h3 class="title">你画的流程图</h3>
-        <n-button text type="primary" size="small" @click="myFlowchartZoom = true"> 放大看 </n-button>
-        <n-button text type="primary" size="small" @click="myFlowchartOpen = !myFlowchartOpen">
-          {{ myFlowchartOpen ? '收起' : '展开' }}
-        </n-button>
-      </div>
+      <SectionHead icon="flowchart">
+        你画的流程图
+        <template #extra>
+          <n-button text type="primary" @click="myFlowchartZoom = true">放大看 ›</n-button>
+          <n-button text type="primary" @click="myFlowchartOpen = !myFlowchartOpen">
+            {{ myFlowchartOpen ? '收起' : '展开' }}
+          </n-button>
+        </template>
+      </SectionHead>
       <div v-if="myFlowchartOpen" class="my-flowchart" role="button" aria-label="放大看你画的流程图" @click="myFlowchartZoom = true">
         <MyFlowchart compact />
       </div>
@@ -247,49 +195,19 @@ const astRequirements = computed(() => Object.entries(problem.value?.astRequirem
       </n-modal>
     </section>
 
-    <template v-if="!isSQL">
-      <!--
-        例子是一张表：例子 N | 输入 | 输出。原来每个例子各占一个小标题加两个框，三个例子
-        就占掉大半屏；Python 的例子大多一两行，摆成表一眼能对上「这个输入 → 这个输出」
-      -->
-      <section v-if="samples.length" class="block">
-        <div class="block-head">
-          <h3 class="title">例子</h3>
-          <n-button text type="primary" size="small" class="block-link" @click="submissionStore.revealResult('custom')"> 自己输入数据试试 › </n-button>
-        </div>
-        <!-- 半格放不下最长那行就整体改成上下排，见 samplesStacked -->
-        <div ref="sampleTable" class="sample-table" :class="{ stacked: samplesStacked, narrow: sampleNarrow }" role="table" aria-label="例子">
-          <div v-if="!samplesStacked" class="sample-row" role="row">
-            <span v-if="!sampleNarrow" role="columnheader"></span>
-            <span role="columnheader" class="sample-label">输入</span>
-            <span role="columnheader" class="sample-label">输出</span>
-          </div>
-          <div v-for="(sample, index) of samples" :key="index" class="sample-row" role="row">
-            <span class="sample-no" role="rowheader">例子 {{ index + 1 }}</span>
-            <template v-for="side in SAMPLE_SIDES" :key="side">
-              <span v-if="samplesStacked" class="sample-label sample-side">
-                {{ SAMPLE_SIDE_LABEL[side] }}
-              </span>
-              <div class="sample-cell" role="cell">
-                <pre class="testcase">{{ sample[side] }}</pre>
-                <button
-                  type="button"
-                  class="sample-copy"
-                  :aria-label="`复制例子 ${index + 1} 的${SAMPLE_SIDE_LABEL[side]}`"
-                  @click="copySample(`${index}-${side}`, sample[side])"
-                >
-                  {{ copiedKey === `${index}-${side}` ? '已复制' : '复制' }}
-                </button>
-              </div>
-            </template>
-          </div>
-        </div>
-      </section>
-    </template>
+    <section v-if="!isSQL && samples.length" class="block">
+      <SectionHead icon="samples">
+        例子
+        <template #extra>
+          <n-button text type="primary" @click="submissionStore.revealResult('custom')">自己输入数据试试 ›</n-button>
+        </template>
+      </SectionHead>
+      <SampleList :samples="samples" />
+    </section>
 
     <SqlProblemData v-if="isSQL && problem.sqlDisplay" :display="problem.sqlDisplay" :order-sensitive="!!problem.sqlConfig?.order_sensitive">
       <template #title="{ text }">
-        <h3 class="title sql-title">{{ text }}</h3>
+        <SectionHead :icon="text === '数据表' ? 'table' : 'expected'" class="sql-head">{{ text }}</SectionHead>
       </template>
     </SqlProblemData>
 
@@ -298,10 +216,12 @@ const astRequirements = computed(() => Object.entries(problem.value?.astRequirem
       折成一条要点开 —— 摊开放前面的话，长图（1056 有一千来像素高）会把例子挤出第一屏
     -->
     <section v-if="canShowReferenceFlowchart" class="block">
-      <div class="block-head">
-        <h3 class="title">参考流程图</h3>
-        <n-button text type="primary" size="small" class="block-link" @click="referenceZoom = true"> 放大看 </n-button>
-      </div>
+      <SectionHead icon="flowchart">
+        参考流程图
+        <template #extra>
+          <n-button text type="primary" @click="referenceZoom = true">放大看 ›</n-button>
+        </template>
+      </SectionHead>
       <div
         class="reference-flowchart"
         role="button"
@@ -319,268 +239,158 @@ const astRequirements = computed(() => Object.entries(problem.value?.astRequirem
       </n-modal>
     </section>
 
-    <section v-if="problem.hint" class="block">
-      <h3 class="title">提示</h3>
-      <Markdown html :content="problem.hint" />
+    <section v-if="statement.hint" class="block">
+      <SectionHead icon="hint" tone="amber">提示</SectionHead>
+      <Markdown html :content="statement.hint" />
     </section>
 
-    <section v-if="problem.source" class="block">
-      <h3 class="title">来源</h3>
-      <Markdown html :content="problem.source" />
-    </section>
+    <SimilarProblems v-if="showSimilar" title="相似题目推荐" place="content" />
 
-    <SimilarProblems v-if="showSimilar" title="相似题目推荐" />
+    <!-- 来源不单起一节：学生做题用不上它，缩成最底下一行灰字 -->
+    <footer v-if="problem.source" class="source">
+      <span class="source-label">来源</span>
+      <Markdown html :content="problem.source" class="source-text" />
+    </footer>
   </div>
 </template>
 
 <style scoped>
-/* 设计稿「题目页签：还没运行过」 */
-.problem-head {
-  display: flex;
-  flex-direction: column;
-  gap: 6px;
-  margin-bottom: 12px;
-}
-
-.title-row {
-  display: flex;
-  align-items: center;
-  gap: 10px;
-  min-width: 0;
-}
-
-.pid {
-  flex: none;
-  padding: 2px 8px;
-  border-radius: 3px;
-  background-color: rgba(128, 128, 128, 0.12);
-  font-size: 13px;
-  color: v-bind('theme.textColor2');
-}
-
-.problem-title {
-  margin: 0;
-  font-size: 22px;
-  line-height: 1.3;
-}
-
-.meta {
-  display: flex;
-  align-items: center;
-  gap: 8px;
-}
-
-.block {
-  margin-top: 18px;
-}
-
-.block-head {
-  display: flex;
-  align-items: center;
-  gap: 12px;
-  margin-bottom: 6px;
-}
-
-.block-head .title {
-  margin: 0;
-}
-
 .problem-content {
   container: problem-content / inline-size;
 }
 
-.block-link {
-  margin-left: auto;
-}
-
-/*
- * 小节标题（描述 / 输入 / 输出 / 例子 / 提示……）。画板上是 15px 半粗，比 14px 的正文只大一号，
- * 一屏题面扫下来分不出哪是标题（用户 2026-09-29 提出）：加粗、大一号，左边一道主色竖条
- */
-.title {
-  font-size: 16px;
-  font-weight: 700;
-  line-height: 1.4;
-  margin: 0 0 6px;
-  padding-left: 9px;
-  border-left: 3px solid v-bind('theme.primaryColor');
-}
-
-.io {
-  display: grid;
-  grid-template-columns: repeat(2, minmax(0, 1fr));
-  gap: 16px;
-}
-
-/* 窄的时候输入、输出上下排：并排的话长一点的说明挤成一字两行的窄条，旁边一栏空着 */
-@container problem-content (max-width: 480px) {
-  .io {
-    grid-template-columns: minmax(0, 1fr);
-  }
-}
-
-/* 语法要求：一行的浅绿框，硬性的判定条件，放在最前面 */
-.requirements {
-  padding: 8px 12px;
-  border-radius: 6px;
-  border: 1px solid rgba(24, 160, 88, 0.3);
-  background-color: rgba(24, 160, 88, 0.06);
+/* 题号 | 题名 | ……… | 难度 状态 */
+.problem-head {
   display: flex;
-  align-items: center;
   flex-wrap: wrap;
-  gap: 6px 8px;
-  font-size: 13px;
+  align-items: baseline;
+  gap: 4px 10px;
 }
 
-.requirements-head {
-  font-weight: 600;
-}
-
-.requirements-note {
+.pid {
+  flex: none;
+  font-size: 16px;
+  font-variant-numeric: tabular-nums;
   color: v-bind('theme.textColor3');
 }
 
-.lang-label {
+.problem-title {
+  margin: 0;
+  min-width: 0;
+  font-size: 22px;
+  line-height: 1.3;
+  overflow-wrap: anywhere;
+}
+
+.meta {
+  margin-left: auto;
+  display: flex;
+  align-items: center;
+  gap: 6px;
+  align-self: center;
+}
+
+/* 「已解决」实心绿：做完了要一眼看得出 */
+.meta .solved {
+  background-color: v-bind('theme.successColor');
+  color: #fff;
   font-weight: 600;
 }
 
-/* 参考流程图：和例子的格子同一种浅灰底 */
+.block {
+  margin-top: 20px;
+}
+
+/* 题面里老师自己写的标题（2020 开头的「鸣潮公式」是 h1）：降成和正文一样大的粗体，
+   不然比题名还大，顶在「描述」下面像另起了一道题 */
+.problem-content :deep(.oj-markdown :is(h1, h2, h3, h4, h5, h6)) {
+  margin: 0.8em 0 0.3em;
+  font-size: 16px;
+  font-weight: 700;
+  line-height: 1.5;
+}
+
+/* 语法要求：每条一行 */
+.lang-label {
+  margin: 6px 0 2px;
+  font-size: 14px;
+  font-weight: 600;
+}
+
+.rules {
+  margin: 0;
+  padding: 0;
+  list-style: none;
+  display: flex;
+  flex-direction: column;
+  gap: 4px;
+  font-size: 16px;
+  line-height: 1.6;
+}
+
+.rules li {
+  display: flex;
+  align-items: flex-start;
+  gap: 8px;
+}
+
+.rule-icon {
+  flex: none;
+  margin-top: 0.3em;
+}
+
+.rules .require .rule-icon {
+  color: v-bind('theme.successColor');
+}
+
+.rules .forbid .rule-icon {
+  color: v-bind('theme.errorColor');
+}
+
+.rules .count .rule-icon {
+  color: v-bind('theme.infoColor');
+}
+
+/* SQL 的「数据表 / 期望结果」和别的小节一样隔开 */
+.sql-head {
+  margin-top: 20px;
+}
+
+/* 参考流程图：和例子的输入格同一种浅灰底 */
 .reference-flowchart {
   cursor: zoom-in;
-  border-radius: 6px;
+  border-radius: 8px;
+  border: 1px solid rgba(128, 128, 128, 0.14);
   background-color: rgba(128, 128, 128, 0.05);
   padding: 16px 12px;
 }
 
 .my-flowchart {
   cursor: zoom-in;
-  border-radius: 6px;
-  background-color: rgba(128, 128, 128, 0.06);
+  border-radius: 8px;
+  border: 1px solid rgba(128, 128, 128, 0.14);
+  background-color: rgba(128, 128, 128, 0.05);
   padding: 8px;
 }
 
-/*
- * 例子：例子 N | 输入 | 输出，每格右边一个「复制」。
- * 放不下时（.stacked）每个例子两行：例子 N | 输入 | 那格，下一行 输出 | 那格
- */
-.sample-table {
+.source {
+  margin-top: 24px;
+  padding-top: 10px;
+  border-top: 1px solid v-bind('theme.dividerColor');
   display: flex;
-  flex-direction: column;
-  gap: 6px;
-}
-
-.sample-table.stacked {
-  gap: 12px;
-}
-
-.sample-row {
-  display: grid;
-  grid-template-columns: v-bind('sampleCss.noW') minmax(0, 1fr) minmax(0, 1fr);
-  gap: 6px v-bind('sampleCss.gap');
-  align-items: stretch;
-}
-
-.stacked .sample-row {
-  grid-template-columns: v-bind('sampleCss.noW') 32px minmax(0, 1fr);
-}
-
-.sample-label,
-.sample-no {
-  font-size: 12px;
+  align-items: baseline;
+  gap: 8px;
+  font-size: 13px;
   color: v-bind('theme.textColor3');
 }
 
-.sample-no {
-  display: flex;
-  align-items: center;
-}
-
-/* 上下排时「例子 N」竖跨输入、输出两行，和「输入」对齐在顶上 */
-.stacked .sample-no {
-  grid-row: span 2;
-  align-items: flex-start;
-}
-
-.stacked .sample-no,
-.sample-side {
-  padding-top: 8px;
-  line-height: 1.5;
-}
-
-/* 窄：「例子 N」占满一行当小标题，下面输入、输出（并排或上下排） */
-.narrow .sample-row {
-  grid-template-columns: minmax(0, 1fr) minmax(0, 1fr);
-}
-
-.narrow.stacked .sample-row {
-  grid-template-columns: 32px minmax(0, 1fr);
-}
-
-.narrow .sample-no,
-.narrow.stacked .sample-no {
-  grid-column: 1 / -1;
-  grid-row: auto;
-  padding-top: 4px;
-}
-
-.sample-table.narrow {
-  gap: 10px;
-}
-
-.sample-cell {
-  min-width: 0;
-  display: flex;
-  align-items: flex-start;
-  padding: v-bind('sampleCss.pad');
-  border-radius: 6px;
-  background-color: rgba(128, 128, 128, 0.08);
-}
-
-.testcase {
-  flex: 1 1 auto;
-  min-width: 0;
-  margin: 0;
-  padding: 4px 0;
-  font: v-bind('sampleCss.font');
-  line-height: 1.5;
-  white-space: pre;
-  overflow-x: auto;
-}
-
-/* 整宽也放不下、只好横着滚的那二十来道：Windows 上默认那根带箭头的粗滚动条比例子本身还显眼 */
-.testcase::-webkit-scrollbar {
-  height: 6px;
-}
-
-.testcase::-webkit-scrollbar-thumb {
-  border-radius: 3px;
-  background-color: rgba(128, 128, 128, 0.35);
-}
-
-.testcase::-webkit-scrollbar-track {
-  background: transparent;
-}
-
-.sample-copy {
+.source-label {
   flex: none;
-  width: v-bind('sampleCss.copyW');
-  height: 24px;
-  margin-top: 2px;
-  padding: 0;
-  border: 0;
-  border-radius: 4px;
-  background: transparent;
-  font: inherit;
-  font-size: 12px;
-  color: v-bind('theme.primaryColorPressed');
-  cursor: pointer;
 }
 
-.sample-copy:hover {
-  background-color: rgba(24, 160, 88, 0.1);
-}
-
-.sql-title {
-  margin-top: 14px;
+.source-text {
+  min-width: 0;
+  font-size: 13px;
+  line-height: 1.6;
 }
 </style>

apps/web/src/oj/problem/components/ProblemEditor.vue

@@ -182,16 +182,25 @@ watch(
  * 没有画这一步的课，画着流程图时不动他
  */
 const lessonStore = useLessonStore()
-let lessonLanguageFor: string | null = null
+/**
+ * 换过的（题 + 这一节 + 该做的那一步）都记下：换到别的题再回来，同一步不再换第二次。
+ * 编辑器在换题时不重新挂载（detail.vue 只重新 init），只记最后一个的话一回来又被拽回去
+ */
+const lessonSwitched = new Set<string>()
+let lessonViewing: string | null = null
 watch(
   () => [problem.value?._id, lessonStore.activity] as const,
   ([id, activity]) => {
     if (!id || !activity) return
-    const key = [id, activity.day, activity.mode, activity.language].join('|')
-    if (lessonLanguageFor === key) return
-    lessonLanguageFor = key
-    if (ctx.value.entry !== 'problem' || teacherCollab.value) return
+    const lesson = [id, activity.day, activity.mode, activity.language].join('|')
     const item = lessonStore.find(id)
+    const key = [lesson, item?.draw && item.draw !== 'accepted' ? 'draw' : 'code'].join('|')
+    // 停在这道题上、只是课堂状态刷新了（比如刚画对图）：不跟着换，也不记，下回打开这道题再换
+    const stay = lessonViewing === lesson
+    lessonViewing = lesson
+    if (lessonSwitched.has(key) || stay) return
+    lessonSwitched.add(key)
+    if (ctx.value.entry !== 'problem' || teacherCollab.value) return
     if (!item) return
     if (item.draw && item.draw !== 'accepted') {
       if (problemStore.canDraw && codeStore.code.language !== 'Flowchart') problemStore.switchLanguage('Flowchart')

apps/web/src/oj/problem/components/ResultHeader.vue

@@ -101,8 +101,8 @@ const color = computed(() => {
 .result-header {
   display: flex;
   flex-direction: column;
-  gap: 6px;
-  margin-bottom: 12px;
+  gap: 8px;
+  margin-bottom: 18px;
 }
 
 .line {
@@ -114,8 +114,8 @@ const color = computed(() => {
 
 .badge {
   flex: none;
-  width: 24px;
-  height: 24px;
+  width: 26px;
+  height: 26px;
   border-radius: 50%;
   display: flex;
   align-items: center;
@@ -125,12 +125,14 @@ const color = computed(() => {
 }
 
 .title {
-  font-size: 18px;
+  font-size: 22px;
+  line-height: 1.3;
   font-weight: 700;
   color: v-bind('color.text');
 }
 
 .sub {
+  font-size: 15px;
   color: v-bind('theme.textColor3');
 }
 

apps/web/src/oj/problem/components/ResultPane.vue

@@ -74,20 +74,22 @@ function pick(segment: Segment) {
 <template>
   <FlowchartResult v-if="drawing" />
   <div v-show="!drawing" class="result-pane">
-    <!-- 设计稿：三个胶囊，选中的深色实心，带上那次结果的时间 -->
-    <div v-if="showSegments" class="segments" role="tablist" aria-label="结果">
-      <button
-        v-for="segment in segments"
-        :key="segment.value"
-        type="button"
-        role="tab"
-        class="segment"
-        :class="{ active: isActive(segment.value) }"
-        :aria-selected="isActive(segment.value)"
-        @click="pick(segment.value)"
-      >
-        {{ segment.label }}<template v-if="segment.time"> · {{ segment.time }}</template>
-      </button>
+    <!-- 三个分段，带上那次结果的时间 -->
+    <div v-if="showSegments" class="segments">
+      <div class="segment-track" role="tablist" aria-label="结果">
+        <button
+          v-for="segment in segments"
+          :key="segment.value"
+          type="button"
+          role="tab"
+          class="segment"
+          :class="{ active: isActive(segment.value) }"
+          :aria-selected="isActive(segment.value)"
+          @click="pick(segment.value)"
+        >
+          {{ segment.label }}<span v-if="segment.time" class="segment-time">{{ segment.time }}</span>
+        </button>
+      </div>
       <span v-if="resultSegment === 'custom'" class="segment-note">自己编数据试试，这里不判对错</span>
     </div>
 
@@ -116,35 +118,53 @@ function pick(segment: Segment) {
   padding-bottom: 16px;
 }
 
+/* 设计稿「题目页观感」结果 X：浅灰底的分段按钮，选中的白底加粗（和工具栏「写代码 / 画流程图」一个样子） */
 .segments {
   display: flex;
   flex-wrap: wrap;
-  gap: 8px;
-  margin-bottom: 14px;
+  align-items: center;
+  gap: 8px 12px;
+  margin-bottom: 16px;
+}
+
+.segment-track {
+  display: inline-flex;
+  gap: 2px;
+  padding: 3px;
+  border-radius: 8px;
+  background-color: rgba(128, 128, 128, 0.12);
 }
 
 .segment {
   height: 28px;
   padding: 0 12px;
   border: 0;
-  border-radius: 15px;
-  background-color: rgba(128, 128, 128, 0.12);
+  border-radius: 6px;
+  background: transparent;
   color: v-bind('theme.textColor2');
   font: inherit;
-  font-size: 13px;
+  font-size: 14px;
+  white-space: nowrap;
   cursor: pointer;
 }
 
+.segment-time {
+  margin-left: 4px;
+  font-size: 12px;
+  font-weight: 400;
+  color: v-bind('theme.textColor3');
+}
+
 .segment-note {
-  margin-left: auto;
-  align-self: center;
   font-size: 13px;
   color: v-bind('theme.textColor3');
 }
 
 .segment.active {
-  background-color: v-bind('theme.textColor1');
-  color: v-bind('theme.cardColor');
+  background-color: v-bind('theme.cardColor');
+  color: v-bind('theme.textColor1');
+  font-weight: 600;
+  box-shadow: 0 1px 2px rgba(0, 0, 0, 0.08);
 }
 
 .formatted {

apps/web/src/oj/problem/components/RuntimeErrorExplain.vue

@@ -1,9 +1,10 @@
 <script setup lang="ts">
 import { clearErrorMark, showErrorMark } from 'oj/problem/utils/errorMark'
 import { explainRuntimeError, type RuntimeErrorInfo } from 'oj/problem/utils/runtimeError'
+import SectionHead from './SectionHead.vue'
 
 /**
- * 运行时错误的中文说明卡片（诊断由后端 judge/runtime-diagnosis.ts 给）。
+ * 运行时错误的中文说明（诊断由后端 judge/runtime-diagnosis.ts 给）。
  * 知道是第几行的，就把那一行代码摆出来，并在编辑器里标红；卸掉时清掉标记。
  */
 const props = defineProps<{
@@ -34,34 +35,50 @@ onUnmounted(clearErrorMark)
 </script>
 
 <template>
-  <n-card embedded class="explain-card">
-    <n-flex vertical :size="12">
-      <div class="explain">
-        <b v-if="info.line">第 {{ info.line }} 行运行时出错：</b>{{ message }}
-      </div>
-      <pre v-if="sourceLine" class="explain-code">{{ sourceLine }}</pre>
-    </n-flex>
-  </n-card>
+  <!-- 设计稿「题目页观感」结果 X：黄色小节标题说第几行，正文大小的中文说明，再把那一行代码摆出来 -->
+  <div class="explain-section">
+    <SectionHead icon="problem" tone="amber">{{ info.line ? `第 ${info.line} 行出错` : '程序跑到一半出错了' }}</SectionHead>
+    <p class="explain">{{ message }}</p>
+    <div v-if="sourceLine" class="explain-code">
+      <span class="line-no">{{ info.line }}</span>
+      <pre>{{ sourceLine }}</pre>
+    </div>
+  </div>
 </template>
 
 <style scoped>
-/* 结果弹窗不限宽，长句子不折行会把弹窗撑出屏幕 */
-.explain-card {
-  max-width: 560px;
-}
-
 .explain {
+  margin: 0 0 10px;
   font-size: 16px;
-  line-height: 1.7;
+  line-height: 1.75;
 }
 
+/* 出错的那一行：红底，前面写行号，和编辑器里标红的那一行对得上 */
 .explain-code {
+  display: flex;
+  align-items: flex-start;
+  gap: 12px;
+  padding: 5px 10px;
+  border-radius: 6px;
+  background-color: rgba(208, 48, 80, 0.06);
+  border: 1px solid rgba(208, 48, 80, 0.24);
+  font-family: Consolas, Monaco, monospace;
+  font-size: 16px;
+  line-height: 24px;
+}
+
+.line-no {
+  flex: none;
+  font-weight: 700;
+  color: #d03050;
+}
+
+.explain-code pre {
+  flex: 1 1 auto;
+  min-width: 0;
   margin: 0;
-  padding: 8px 12px;
-  border-radius: 4px;
-  font-size: 15px;
+  font: inherit;
   white-space: pre-wrap;
   word-break: break-all;
-  background-color: rgba(208, 48, 80, 0.12);
 }
 </style>

apps/web/src/oj/problem/components/SampleList.vue

@@ -0,0 +1,312 @@
+<script setup lang="ts">
+import { Icon } from '@iconify/vue'
+import { copyToClipboard } from 'utils/functions'
+import { SubmissionStatus } from 'utils/constants'
+import { useCodeStore } from 'oj/store/code'
+import { useSubmissionStore } from 'oj/store/submission'
+
+/**
+ * 题面的例子：每组一行「输入 → 输出」，输出浅绿底（设计稿「题目页观感」ExCard，2026-11-04 定）。
+ *
+ * - 输入写的是「无」或者空的（常用题里 12% 的例子）写灰字「不用输入」，不给复制：
+ *   原来摆成一格可复制的「无」，学生以为要输入一个「无」。
+ * - 行首的空格画成浅灰点：菱形、三角形那几道靠行首空格对齐，数不清空格就照着排错了。
+ *   只是画成点，复制出去的还是空格。
+ * - 半格放不下最长那行，这道题的例子整体改成上下排（输入、↓、输出）。整宽还放不下的那一行
+ *   才折行，**折下来的部分缩进两格**：原来不折、横着滚，就是怕学生分不清折行和真换行、
+ *   照着多输出一个换行；缩进之后两者一眼能分开，又不用去找那根细滚动条。
+ * - 「运行例子」跑过之后，序号上标 ✓ / ✗（还是会跳到「结果」页签，切回来就看得到）。
+ *   代码改过就不再标：标的是上一份代码的对错，留着会让学生以为改完的还对。
+ */
+const { samples } = defineProps<{
+  samples: { input: string; output: string }[]
+}>()
+
+const SIDES = ['input', 'output'] as const
+const SIDE_LABEL = { input: '输入', output: '输出' } as const
+
+/** 输入写「无」或者空着：这道题不用输入 */
+function noInput(text: string) {
+  const trimmed = text.trim()
+  return trimmed === '' || trimmed === '无'
+}
+
+/** 每一行拆成「行首空格数 + 余下的字」，模板里把行首空格画成点 */
+function linesOf(text: string) {
+  return text.split('\n').map((line) => {
+    const lead = /^ +/.exec(line)?.[0].length ?? 0
+    return { lead, rest: line.slice(lead) }
+  })
+}
+
+// ==================== 摆成一行还是上下排 ====================
+// 下面几个尺寸 CSS 里也用（v-bind），量宽度和排版是同一套数
+const FONT_SIZE = 16
+const FONT = `${FONT_SIZE}px Consolas, Monaco, monospace`
+const DOT_W = 26
+const ARROW_W = 22
+const GAP = 6
+/** 格子里除了字以外占掉的：左右内边距、复制按钮、按钮前的间距、边框 */
+const PANE_CHROME = 10 + 4 + 26 + 4 + 2
+
+let measureCtx: CanvasRenderingContext2D | null = null
+/** 例子里最长那一行排出来有多宽（px）。等宽字体里中文、表情照样比英文宽，所以按字体真量 */
+const widest = computed(() => {
+  measureCtx ??= document.createElement('canvas').getContext('2d')
+  if (!measureCtx) return 0
+  measureCtx.font = FONT
+  let max = 0
+  for (const sample of samples) {
+    for (const side of SIDES) {
+      if (side === 'input' && noInput(sample.input)) continue
+      for (const line of sample[side].split('\n')) {
+        const width = measureCtx.measureText(line.replace(/\t/g, '        ')).width
+        if (width > max) max = width
+      }
+    }
+  }
+  return max
+})
+
+const list = useTemplateRef<HTMLElement>('list')
+const { width: listWidth } = useElementSize(list)
+const halfText = computed(() => (listWidth.value - DOT_W - ARROW_W - GAP * 3) / 2 - PANE_CHROME)
+const stacked = computed(() => listWidth.value > 0 && widest.value > halfText.value)
+
+// ==================== 复制 ====================
+const message = useMessage()
+const copiedKey = ref('')
+const { start: resetCopied } = useTimeoutFn(() => (copiedKey.value = ''), 1000, { immediate: false })
+async function copy(key: string, text: string) {
+  if (await copyToClipboard(text)) {
+    copiedKey.value = key
+    resetCopied()
+  } else {
+    message.error('复制失败')
+  }
+}
+
+// ==================== 运行例子的 ✓ / ✗ ====================
+const submissionStore = useSubmissionStore()
+const codeStore = useCodeStore()
+const marks = computed<Record<number, 'ok' | 'bad'>>(() => {
+  const trial = submissionStore.trial
+  const ran = trial.samplesCode.value
+  if (trial.samplesRunning.value || !ran) return {}
+  if (ran.value !== codeStore.code.value || ran.language !== codeStore.code.language) return {}
+  const out: Record<number, 'ok' | 'bad'> = {}
+  for (const run of trial.sampleRuns.value) {
+    out[run.index] = run.result === SubmissionStatus.accepted ? 'ok' : 'bad'
+  }
+  return out
+})
+function markLabel(index: number) {
+  const mark = marks.value[index]
+  if (mark === 'ok') return `例子 ${index + 1}，运行结果对了`
+  if (mark === 'bad') return `例子 ${index + 1}，运行结果不对`
+  return `例子 ${index + 1}`
+}
+
+const css = {
+  font: FONT,
+  dotW: `${DOT_W}px`,
+  arrowW: `${ARROW_W}px`,
+  gap: `${GAP}px`,
+}
+</script>
+
+<template>
+  <div ref="list" class="sample-list" :class="{ stacked }" role="list" aria-label="例子">
+    <div v-if="!stacked" class="cols" aria-hidden="true">
+      <span />
+      <span>输入</span>
+      <span />
+      <span>输出</span>
+    </div>
+    <div v-for="(sample, index) of samples" :key="index" class="pair" role="listitem">
+      <span class="dot" :class="marks[index]" :aria-label="markLabel(index)">
+        <Icon v-if="marks[index] === 'ok'" icon="ph:check-bold" :width="13" />
+        <Icon v-else-if="marks[index] === 'bad'" icon="ph:x-bold" :width="12" />
+        <template v-else>{{ index + 1 }}</template>
+      </span>
+      <div class="sides">
+        <template v-for="side in SIDES" :key="side">
+          <span v-if="side === 'output'" class="arrow" aria-hidden="true">
+            <Icon :icon="stacked ? 'ph:arrow-down' : 'ph:arrow-right'" :width="16" />
+          </span>
+          <div v-if="side === 'input' && noInput(sample.input)" class="pane in none">不用输入</div>
+          <div v-else class="pane" :class="side === 'input' ? 'in' : 'out'">
+            <pre class="text" :aria-label="`例子 ${index + 1} 的${SIDE_LABEL[side]}`"><span
+              v-for="(line, i) of linesOf(sample[side])"
+              :key="i"
+              class="line"
+              ><span v-if="line.lead" class="lead">{{ '·'.repeat(line.lead) }}</span>{{ line.rest }}</span
+            ></pre>
+            <button type="button" class="copy" :aria-label="`复制例子 ${index + 1} 的${SIDE_LABEL[side]}`" @click="copy(`${index}-${side}`, sample[side])">
+              <Icon :icon="copiedKey === `${index}-${side}` ? 'ph:check' : 'ph:copy'" :width="15" />
+            </button>
+          </div>
+        </template>
+      </div>
+    </div>
+  </div>
+</template>
+
+<style scoped>
+.sample-list {
+  display: flex;
+  flex-direction: column;
+  gap: 8px;
+  --pane-in-bg: rgba(128, 128, 128, 0.07);
+  --pane-in-border: rgba(128, 128, 128, 0.14);
+  --pane-out-bg: rgba(24, 160, 88, 0.08);
+  --pane-out-border: rgba(24, 160, 88, 0.26);
+  --lead: rgba(24, 160, 88, 0.45);
+  --muted: rgba(128, 128, 128, 0.75);
+}
+
+:global(html.dark) .sample-list {
+  --pane-out-bg: rgba(99, 226, 183, 0.08);
+  --pane-out-border: rgba(99, 226, 183, 0.26);
+  --lead: rgba(99, 226, 183, 0.45);
+}
+
+.sample-list.stacked {
+  gap: 12px;
+}
+
+.cols,
+.pair {
+  display: grid;
+  grid-template-columns: v-bind('css.dotW') minmax(0, 1fr);
+  gap: 0 v-bind('css.gap');
+}
+
+.cols {
+  grid-template-columns: v-bind('css.dotW') minmax(0, 1fr) v-bind('css.arrowW') minmax(0, 1fr);
+  margin-bottom: -4px;
+  font-size: 12px;
+  line-height: 20px;
+  color: var(--muted);
+}
+
+/* 一行：输入 → 输出；上下排：输入、↓、输出 */
+.sides {
+  display: grid;
+  grid-template-columns: minmax(0, 1fr) v-bind('css.arrowW') minmax(0, 1fr);
+  gap: 0 v-bind('css.gap');
+  align-items: stretch;
+  min-width: 0;
+}
+
+.stacked .sides {
+  grid-template-columns: minmax(0, 1fr);
+}
+
+.dot {
+  width: 22px;
+  height: 22px;
+  margin-top: 7px;
+  border-radius: 50%;
+  display: flex;
+  align-items: center;
+  justify-content: center;
+  font-size: 12px;
+  font-weight: 700;
+  font-variant-numeric: tabular-nums;
+  background-color: rgba(128, 128, 128, 0.14);
+  color: var(--muted);
+}
+
+.dot.ok {
+  background-color: #18a058;
+  color: #fff;
+}
+
+.dot.bad {
+  background-color: #d03050;
+  color: #fff;
+}
+
+.arrow {
+  display: flex;
+  justify-content: center;
+  padding-top: 10px;
+  color: var(--muted);
+}
+
+.stacked .arrow {
+  justify-content: flex-start;
+  padding: 2px 0 2px 14px;
+}
+
+.pane {
+  min-width: 0;
+  display: flex;
+  align-items: flex-start;
+  gap: 4px;
+  padding: 5px 4px 5px 10px;
+  border-radius: 6px;
+}
+
+.pane.in {
+  background-color: var(--pane-in-bg);
+  border: 1px solid var(--pane-in-border);
+}
+
+.pane.out {
+  background-color: var(--pane-out-bg);
+  border: 1px solid var(--pane-out-border);
+}
+
+.pane.none {
+  align-self: start;
+  background-color: transparent;
+  border-style: dashed;
+  padding-right: 10px;
+  font-size: 14px;
+  line-height: 24px;
+  color: var(--muted);
+}
+
+.text {
+  flex: 1 1 auto;
+  min-width: 0;
+  margin: 0;
+  font: v-bind('css.font');
+  line-height: 24px;
+}
+
+/* 一行一块：整宽还放不下才折，折下来的缩进两格，和真换行分得开 */
+.line {
+  display: block;
+  min-height: 24px;
+  padding-left: 2ch;
+  text-indent: -2ch;
+  white-space: pre-wrap;
+  overflow-wrap: anywhere;
+}
+
+.lead {
+  color: var(--lead);
+}
+
+.copy {
+  flex: none;
+  width: 26px;
+  height: 24px;
+  padding: 0;
+  border: 0;
+  border-radius: 4px;
+  background: transparent;
+  color: var(--muted);
+  display: inline-flex;
+  align-items: center;
+  justify-content: center;
+  cursor: pointer;
+}
+
+.copy:hover {
+  background-color: rgba(128, 128, 128, 0.14);
+}
+</style>

apps/web/src/oj/problem/components/SampleRunResult.vue

@@ -103,22 +103,14 @@ const current = computed(() => sampleRuns.value[selected.value] ?? null)
     </ResultHeader>
 
     <template v-if="current">
-      <!-- 对上了：三栏摆出来就行 -->
+      <!-- 对上了：输入、正确输出、你的输出竖着摆出来就行，你的输出也是绿的 -->
       <div v-if="current.result === SubmissionStatus.accepted" class="passed-card">
-        <div class="blocks">
-          <div class="block">
-            <div class="label">输入</div>
-            <pre>{{ current.input }}</pre>
-          </div>
-          <div class="block">
-            <div class="label">正确输出</div>
-            <pre>{{ current.expected }}</pre>
-          </div>
-          <div class="block">
-            <div class="label">你的输出</div>
-            <pre>{{ current.output }}</pre>
-          </div>
-        </div>
+        <span class="label">输入</span>
+        <pre class="pane in">{{ current.input }}</pre>
+        <span class="label">正确输出</span>
+        <pre class="pane ok">{{ current.expected }}</pre>
+        <span class="label">你的输出</span>
+        <pre class="pane ok">{{ current.output }}</pre>
       </div>
       <!-- 跑完了、输出对不上：和判完之后同一套说明 -->
       <WrongAnswerExplain
@@ -134,6 +126,7 @@ const current = computed(() => sampleRuns.value[selected.value] ?? null)
         :code="samplesCode?.value ?? ''"
         :language="samplesCode?.language ?? ''"
         :plain="inContest"
+        section="stack"
       />
       <!-- 没跑完：编译不过、运行出错、超时 -->
       <TrialErrorNote
@@ -165,15 +158,16 @@ const current = computed(() => sampleRuns.value[selected.value] ?? null)
 }
 
 .run {
-  height: 26px;
+  height: 28px;
   box-sizing: border-box;
   padding: 0 10px;
-  border-radius: 13px;
+  border-radius: 6px;
   display: flex;
   align-items: center;
   gap: 4px;
   font: inherit;
   font-size: 13px;
+  font-weight: 600;
   cursor: pointer;
 }
 
@@ -189,56 +183,58 @@ const current = computed(() => sampleRuns.value[selected.value] ?? null)
   color: v-bind('theme.errorColorPressed');
 }
 
-.run.active {
-  font-weight: 600;
-  border-width: 1.5px;
-}
-
+/* 选中的那个涂实心：设计稿「运行例子」 */
 .run.ok.active {
   border-color: v-bind('theme.successColor');
+  background-color: v-bind('theme.successColor');
+  color: #fff;
 }
 
 .run.bad.active {
   border-color: v-bind('theme.errorColor');
+  background-color: v-bind('theme.errorColor');
+  color: #fff;
 }
 
+/* 对上了：和答错时同一张两列的网格（标签 | 格子），只是你的输出也是绿的 */
 .passed-card {
-  padding: 12px 14px;
-  border-radius: 6px;
-  background-color: rgba(128, 128, 128, 0.06);
-  border: 1px solid v-bind('theme.dividerColor');
-}
-
-.blocks {
   display: grid;
-  grid-template-columns: repeat(3, minmax(0, 1fr));
-  gap: 8px;
-}
-
-.block {
-  min-width: 0;
-  padding: 6px 10px 8px;
-  border-radius: 5px;
-  background-color: v-bind('theme.cardColor');
-  border: 1px solid v-bind('theme.dividerColor');
+  grid-template-columns: 64px minmax(0, 1fr);
+  gap: 6px 8px;
+  align-items: start;
 }
 
 .label {
-  font-size: 12px;
-  opacity: 0.7;
-  margin-bottom: 4px;
+  font-size: 13px;
+  line-height: 36px;
+  white-space: nowrap;
+  color: v-bind('theme.textColor3');
 }
 
-.block pre {
+.pane {
+  min-width: 0;
   margin: 0;
+  padding: 5px 10px;
+  border-radius: 6px;
   white-space: pre-wrap;
   word-break: break-all;
-  font-family: Monaco, Consolas, monospace;
-  font-size: 14px;
+  font-family: Consolas, Monaco, monospace;
+  font-size: 16px;
+  line-height: 24px;
+}
+
+.pane.in {
+  background-color: rgba(128, 128, 128, 0.07);
+  border: 1px solid rgba(128, 128, 128, 0.14);
+}
+
+.pane.ok {
+  background-color: rgba(24, 160, 88, 0.08);
+  border: 1px solid rgba(24, 160, 88, 0.26);
 }
 
 .note {
-  margin: 12px 0 0;
+  margin: 16px 0 0;
   font-size: 13px;
   color: v-bind('theme.textColor3');
 }

apps/web/src/oj/problem/components/SectionHead.vue

@@ -0,0 +1,122 @@
+<script setup lang="ts">
+import { Icon } from '@iconify/vue'
+/**
+ * 题面的小节标题：线条图标 + 绿字 + 一根细线拖到头，线尾可以挂一个链接
+ * （「自己输入数据试试 ›」「放大看 ›」）。设计稿「题目页观感」⑦，2026-11-04 定。
+ *
+ * 语法要求、提示用黄色：一个是硬性条件、一个是帮忙的话，扫一眼要能和别的节分开。
+ * 结果页签里「例子 1 没对上」「第 2 行出错」这类说哪里不对的也用黄色（设计稿结果 X）。
+ * 明暗两套色都在 CSS 里（html.dark），别在这里调 useDark() —— 理由见 ProblemTypeTag。
+ */
+export type SectionIcon =
+  | 'description'
+  | 'input'
+  | 'output'
+  | 'samples'
+  | 'hint'
+  | 'rules'
+  | 'table'
+  | 'expected'
+  | 'flowchart'
+  | 'similar'
+  | 'problem'
+  | 'next'
+  | 'challenge'
+
+const ICON: Record<SectionIcon, string> = {
+  description: 'ph:book-open',
+  input: 'ph:sign-in',
+  output: 'ph:sign-out',
+  samples: 'ph:flask',
+  hint: 'ph:lightbulb',
+  rules: 'ph:code',
+  table: 'ph:table',
+  expected: 'ph:check-circle',
+  flowchart: 'ph:flow-arrow',
+  similar: 'ph:shuffle-angular',
+  // 结果页签：哪里不对、接着做、还能挑战
+  problem: 'ph:warning-circle',
+  next: 'ph:arrow-right',
+  challenge: 'ph:target',
+}
+
+const { icon, tone = 'green' } = defineProps<{
+  icon: SectionIcon
+  tone?: 'green' | 'amber'
+}>()
+</script>
+
+<template>
+  <div class="section-head" :class="tone">
+    <h3 class="section-title">
+      <Icon :icon="ICON[icon]" :width="19" class="section-icon" aria-hidden="true" />
+      <slot />
+    </h3>
+    <span class="section-line" aria-hidden="true" />
+    <span v-if="$slots.extra" class="section-extra"><slot name="extra" /></span>
+  </div>
+</template>
+
+<style scoped>
+.section-head {
+  display: flex;
+  align-items: center;
+  gap: 10px;
+  margin: 0 0 6px;
+  --head-text: #0c6b3b;
+  --head-icon: #18a058;
+  --head-line: rgba(24, 160, 88, 0.22);
+}
+
+.section-head.amber {
+  --head-text: #8a5a00;
+  --head-icon: #c98a00;
+  --head-line: rgba(201, 138, 0, 0.25);
+}
+
+:global(html.dark) .section-head {
+  --head-text: #63e2b7;
+  --head-icon: #63e2b7;
+  --head-line: rgba(99, 226, 183, 0.22);
+}
+
+:global(html.dark) .section-head.amber {
+  --head-text: #f2c97d;
+  --head-icon: #f2c97d;
+  --head-line: rgba(242, 201, 125, 0.25);
+}
+
+.section-title {
+  display: inline-flex;
+  align-items: center;
+  gap: 8px;
+  margin: 0;
+  font-size: 15px;
+  font-weight: 700;
+  line-height: 1.5;
+  letter-spacing: 2px;
+  white-space: nowrap;
+  color: var(--head-text);
+}
+
+.section-icon {
+  flex: none;
+  color: var(--head-icon);
+}
+
+.section-line {
+  flex: 1 1 auto;
+  min-width: 12px;
+  height: 1px;
+  background-color: var(--head-line);
+}
+
+.section-extra {
+  flex: none;
+  display: inline-flex;
+  align-items: center;
+  gap: 12px;
+  font-size: 14px;
+  white-space: nowrap;
+}
+</style>

apps/web/src/oj/problem/components/SimilarProblems.vue

@@ -1,11 +1,13 @@
 <script lang="ts">
 import type { ProblemRow } from 'utils/types'
 
+type SimilarRow = ProblemRow & { sharedTags: string[] }
+
 /**
  * 同一道题两处（题面末尾、结果页签）都挂着时只拉一次。放在模块级：写在 setup 里就成了
  * 每个实例各一份
  */
-const cache = new Map<string, Promise<ProblemRow[]>>()
+const cache = new Map<string, Promise<SimilarRow[]>>()
 </script>
 
 <script setup lang="ts">
@@ -13,17 +15,28 @@ import { storeToRefs } from 'pinia'
 import { useThemeVars } from 'naive-ui'
 import { getSimilarProblems } from 'oj/api'
 import { useProblemStore } from 'oj/store/problem'
+import { useTone } from 'shared/composables/tone'
+import { problemTypes } from '../utils/problemType'
+import ProblemStatus from './ProblemStatus.vue'
+import ProblemTypeTag from './ProblemTypeTag.vue'
+import SectionHead from './SectionHead.vue'
 
 /**
  * 相似题推荐。题面末尾（做对了、或者错了 3 次以上）和结果页签（不在课堂里的题做对之后）
  * 两处用：原来只在题面最底下，学生交完不会再滚回去看。什么时候出现由调用方的 v-if 决定。
+ * `place` 只管标题的样子：题面里用题面的小节标题（SectionHead），结果页签里和「还能挑战」对齐。
+ *
+ * 每行第二行写和这道题共同的标签：不点开就知道练的是什么。行的写法照题目列表
+ * （灰题号、淡底难度、做对人数、类型标签、做过没对的红「−」）。整行可点，题目名
+ * 和题目列表一样用正文色、不用主题绿：绿字细、在白底上发虚
  */
-const props = defineProps<{ title: string }>()
+const props = defineProps<{ title: string; place: 'content' | 'result' }>()
 
 const theme = useThemeVars()
+const tone = useTone()
 
 const { problem } = storeToRefs(useProblemStore())
-const list = ref<ProblemRow[]>([])
+const list = ref<SimilarRow[]>([])
 
 watch(
   () => problem.value?._id,
@@ -41,30 +54,37 @@ watch(
   { immediate: true },
 )
 
-// getSimilarProblems 已经过 toProblemRow，难度是中文，不是 Low/Mid/High
-function difficultyType(difficulty: string) {
-  if (difficulty === '简单') return 'success'
-  if (difficulty === '困难') return 'error'
-  return 'warning'
+// 做对了的接口已经筛掉，剩下的只有「没做过」和「做过没对」两种；一道都没做过就不留这一列
+const showStatus = computed(() => list.value.some((row) => row.status === 'failed'))
+
+const DIFFICULTY_TONE = { 简单: 'success', 中等: 'warning', 困难: 'error' } as const
+
+function difficultyStyle(row: SimilarRow) {
+  if (!row.difficulty) return {}
+  const t = tone(DIFFICULTY_TONE[row.difficulty])
+  return { color: t.color, background: t.background }
 }
 </script>
 
 <template>
-  <section v-if="list.length" class="similar">
-    <h3 class="title">{{ props.title }}</h3>
-    <n-list bordered>
-      <n-list-item v-for="sp in list" :key="sp._id">
-        <n-flex align="center" justify="space-between" :wrap="false">
-          <router-link :to="{ name: 'problem', params: { problemID: sp._id } }" class="link">
-            <n-tag size="small" :bordered="false">{{ sp._id }}</n-tag>
-            <span class="name">{{ sp.title }}</span>
-          </router-link>
-          <n-tag v-if="sp.difficulty" size="small" :type="difficultyType(sp.difficulty)">
-            {{ sp.difficulty }}
-          </n-tag>
-        </n-flex>
-      </n-list-item>
-    </n-list>
+  <section v-if="list.length" class="similar" :class="props.place">
+    <SectionHead v-if="props.place === 'content'" icon="similar">{{ props.title }}</SectionHead>
+    <h3 v-else class="heading">{{ props.title }}</h3>
+    <div class="rows">
+      <router-link v-for="sp in list" :key="sp._id" :to="{ name: 'problem', params: { problemID: sp._id } }" class="row" :class="{ 'with-status': showStatus }">
+        <span v-if="showStatus" class="status"><ProblemStatus :status="sp.status" /></span>
+        <span class="id">{{ sp._id }}</span>
+        <span class="name">
+          <span class="text">{{ sp.title }}</span>
+          <ProblemTypeTag v-for="kind in problemTypes(sp)" :key="kind" :kind="kind" />
+        </span>
+        <span v-if="sp.difficulty" class="difficulty" :style="difficultyStyle(sp)">{{ sp.difficulty }}</span>
+        <span class="shared">{{ sp.sharedTags.join(' · ') }}</span>
+        <span class="people"
+          ><b>{{ sp.solvedUsers }}</b> 人做对</span
+        >
+      </router-link>
+    </div>
   </section>
 </template>
 
@@ -73,34 +93,126 @@ function difficultyType(difficulty: string) {
   margin-top: 20px;
 }
 
-.title {
-  font-size: 16px;
-  font-weight: 600;
+.similar.result {
+  margin-top: 14px;
+}
+
+.heading {
   margin: 0 0 8px;
 }
 
-/* 列表项的内容区默认按内容撑宽，长标题会把难度挤出屏幕，省略号也不出来 */
-.similar :deep(.n-list-item__main) {
-  min-width: 0;
+/* 和结果页签里的「还能挑战」一样 */
+.result .heading {
+  font-size: 15px;
+  font-weight: 700;
 }
 
-.link {
-  display: inline-flex;
+.rows {
+  border: 1px solid v-bind('theme.dividerColor');
+  border-radius: 6px;
+  overflow: hidden;
+}
+
+/*
+ * 两行：题号 | 题目名 + 类型标签 | 难度
+ *            | 共同的标签       | 做对人数
+ * 做过没对的题最前面多一列红「−」
+ */
+.row {
+  display: grid;
+  grid-template-columns: auto minmax(0, 1fr) auto;
+  grid-template-areas:
+    'id name difficulty'
+    '. shared people';
   align-items: center;
-  gap: 8px;
-  min-width: 0;
-  color: inherit;
+  gap: 4px 12px;
+  padding: 10px 16px;
+  color: v-bind('theme.textColor1');
   text-decoration: none;
 }
 
-.link:hover .name {
+.row.with-status {
+  grid-template-columns: 16px auto minmax(0, 1fr) auto;
+  grid-template-areas:
+    'status id name difficulty'
+    '. . shared people';
+}
+
+.row + .row {
+  border-top: 1px solid v-bind('theme.dividerColor');
+}
+
+.row:hover {
+  background: v-bind('theme.hoverColor');
+}
+
+.row:hover .text {
   text-decoration: underline;
 }
 
+.status {
+  grid-area: status;
+  display: flex;
+  justify-content: center;
+}
+
+.id {
+  grid-area: id;
+  min-width: 36px;
+  font-size: var(--oj-fs-body);
+  color: v-bind('theme.textColor3');
+  font-variant-numeric: tabular-nums;
+}
+
 .name {
-  color: v-bind('theme.primaryColor');
+  grid-area: name;
+  min-width: 0;
+  display: flex;
+  align-items: center;
+  gap: 8px;
+}
+
+.text {
+  min-width: 0;
+  font-size: var(--oj-fs-body);
+  font-weight: 500;
   overflow: hidden;
   text-overflow: ellipsis;
   white-space: nowrap;
 }
+
+.difficulty {
+  grid-area: difficulty;
+  justify-self: end;
+  height: 22px;
+  padding: 0 7px;
+  border-radius: 4px;
+  font-size: var(--oj-fs-meta);
+  display: inline-flex;
+  align-items: center;
+}
+
+.shared {
+  grid-area: shared;
+  min-width: 0;
+  font-size: var(--oj-fs-sec);
+  color: v-bind('theme.textColor2');
+  overflow: hidden;
+  text-overflow: ellipsis;
+  white-space: nowrap;
+}
+
+.people {
+  grid-area: people;
+  justify-self: end;
+  font-size: var(--oj-fs-sec);
+  color: v-bind('theme.textColor2');
+  font-variant-numeric: tabular-nums;
+  white-space: nowrap;
+}
+
+.people b {
+  font-weight: 600;
+  color: v-bind('theme.textColor1');
+}
 </style>

apps/web/src/oj/problem/components/SqlProblemData.vue

@@ -33,8 +33,6 @@ const changedTables = computed(() => {
 
 /** 增删改题里不是题面那组的测试数据可以一行都不改（看学生会不会多改），出题页预览会碰到 */
 const noChange = computed(() => 'changed_tables' in props.display.expected && !props.display.expected.changed_tables.length)
-
-const anyChanged = computed(() => changedTables.value.some(({ changes }) => changes && (changes.cells.size > 0 || changes.newRows.size > 0)))
 </script>
 
 <template>
@@ -62,7 +60,6 @@ const anyChanged = computed(() => changedTables.value.some(({ changes }) => chan
     </template>
   </div>
   <p v-if="noChange" class="sqlNote">执行后所有表都没有变化</p>
-  <p v-if="anyChanged" class="sqlNote legend"><span class="swatch" aria-hidden="true"></span>执行后变了的格子</p>
 </template>
 
 <style scoped>
@@ -77,22 +74,4 @@ const anyChanged = computed(() => changedTables.value.some(({ changes }) => chan
   opacity: 0.65;
   margin: 0 0 8px;
 }
-
-.legend {
-  display: flex;
-  align-items: center;
-  gap: 6px;
-}
-
-.swatch {
-  width: 12px;
-  height: 12px;
-  border: 1px solid #f0d48a;
-  background-color: #fff4d6;
-}
-
-html.dark .swatch {
-  border-color: rgba(240, 180, 40, 0.45);
-  background-color: rgba(240, 180, 40, 0.18);
-}
 </style>

apps/web/src/oj/problem/components/SubmissionResult.vue

@@ -16,6 +16,7 @@ import RuntimeErrorExplain from './RuntimeErrorExplain.vue'
 import WrongAnswerExplain from './WrongAnswerExplain.vue'
 import LessonNext from './LessonNext.vue'
 import ResultHeader from './ResultHeader.vue'
+import SectionHead from './SectionHead.vue'
 import SimilarProblems from './SimilarProblems.vue'
 import ChallengeList from './ChallengeList.vue'
 import ChallengeOutcome from './ChallengeOutcome.vue'
@@ -357,26 +358,34 @@ const columns: DataTableColumn<JudgeCaseResult>[] = [
           :language="submission.language"
           :refresh-key="submission.id"
         />
-        <SimilarProblems v-if="showSimilar" title="再练几道相似的" />
+        <SimilarProblems v-if="showSimilar" title="再练几道相似的" place="result" />
       </div>
     </template>
     <div v-show="!waitingReveal">
-      <n-flex vertical v-if="compileError || runtimeError || sampleCheck || msg || infoTable.length || submission.statisticInfo?.ast_results?.length">
+      <n-flex
+        vertical
+        :size="20"
+        v-if="compileError || runtimeError || sampleCheck || msg || infoTable.length || submission.statisticInfo?.ast_results?.length"
+      >
         <CompileErrorExplain v-if="compileError" :err-info="compileError" :language="submission.language" />
         <RuntimeErrorExplain v-if="runtimeError" :info="runtimeError" :code="submission.code" />
-        <WrongAnswerExplain v-if="sampleCheck" full :check="sampleCheck" :code="submission.code" :language="submission.language" />
-        <n-card v-if="submission.statisticInfo?.ast_results?.length" embedded>
-          <n-flex vertical :size="8">
-            <n-flex v-for="(rule, i) in submission.statisticInfo.ast_results" :key="i" align="center" :size="6">
-              <n-icon :color="rule.passed ? theme.successColor : theme.errorColor">
-                <Icon :icon="rule.passed ? 'ph:check-bold' : 'ph:x-bold'" />
-              </n-icon>
+        <WrongAnswerExplain v-if="sampleCheck" full section="stack" :check="sampleCheck" :code="submission.code" :language="submission.language" />
+        <!-- 语法要求逐条对没对：和题面的「语法要求」同一个黄色小节标题 -->
+        <section v-if="submission.statisticInfo?.ast_results?.length">
+          <SectionHead icon="rules" tone="amber">语法要求</SectionHead>
+          <ul class="ast-rules">
+            <li v-for="(rule, i) in submission.statisticInfo.ast_results" :key="i">
+              <Icon
+                :icon="rule.passed ? 'ph:check-circle-fill' : 'ph:x-circle-fill'"
+                :width="17"
+                :color="rule.passed ? theme.successColor : theme.errorColor"
+              />
               <span>{{ rule.description }}</span>
               <!-- 次数类规则光说「出现 2 次 ✗」，学生不知道自己写了几次 -->
               <span v-if="!rule.passed && rule.actual !== undefined" :style="{ color: theme.errorColor }"> 当前 {{ rule.actual }} 次 </span>
-            </n-flex>
-          </n-flex>
-        </n-card>
+            </li>
+          </ul>
+        </section>
         <n-card v-if="msg" embedded class="msg">{{ msg }}</n-card>
         <n-data-table v-if="infoTable.length" striped :data="infoTable" :columns="columns" />
       </n-flex>
@@ -386,7 +395,10 @@ const columns: DataTableColumn<JudgeCaseResult>[] = [
       问过之后，AI 的回答才放进卡片
     -->
       <div v-if="(showAIHint && !hintTarget) || customRunHint" class="actions">
-        <n-button v-if="showAIHint && !hintTarget" type="primary" ghost :loading="hintLoading" @click="fetchHint(submission.id)"> 让 AI 分析我的代码 </n-button>
+        <n-button v-if="showAIHint && !hintTarget" type="primary" secondary :loading="hintLoading" @click="fetchHint(submission.id)">
+          <template #icon><Icon icon="ph:sparkle-fill" /></template>
+          让 AI 分析我的代码
+        </n-button>
         <n-button v-if="customRunHint" text type="primary" @click="submissionStore.revealResult('custom')">
           {{ customRunHint }}
         </n-button>
@@ -425,7 +437,24 @@ const columns: DataTableColumn<JudgeCaseResult>[] = [
   align-items: center;
   flex-wrap: wrap;
   gap: 8px 16px;
-  margin-top: 12px;
+  margin-top: 16px;
+}
+
+.ast-rules {
+  margin: 0;
+  padding: 0;
+  list-style: none;
+  display: flex;
+  flex-direction: column;
+  gap: 4px;
+  font-size: 16px;
+  line-height: 1.6;
+}
+
+.ast-rules li {
+  display: flex;
+  align-items: center;
+  gap: 8px;
 }
 
 /* 手机上「让 AI 分析我的代码」占满一行、44px 高，好按 */

apps/web/src/oj/problem/components/WrongAnswerExplain.vue

@@ -6,6 +6,7 @@ import { useProblemStore } from 'oj/store/problem'
 import { markdownToText } from 'oj/problem/utils/plainText'
 import { JUDGE_STATUS, SubmissionStatus } from 'utils/constants'
 import { classifyDiff, explainDiff, firstDifferentLine, type SampleCheck } from 'utils/wrongAnswer'
+import SectionHead from './SectionHead.vue'
 
 /**
  * 答案错误时的样例对比（数据见后端 judge/run.ts 的 checkSamples）。
@@ -31,6 +32,15 @@ const props = defineProps<{
    * 提示句全是对学生说的第二人称，整句换掉人称就读得通
    */
   peer?: boolean
+  /**
+   * 新的样子（设计稿「题目页观感」结果 X）：黄色小节标题说哪里不对，说明用正文大小，
+   * 输入 / 正确输出 / 你的输出是灰、绿、红三格。
+   * - stack：三格竖着排，和题面的例子一个样子。题目页的结果页签用（左栏只有 500 多宽）
+   * - row：三格横着并排，正确输出和你的输出一行对一行，不一样的那行两边都垫一层浅黄。
+   *   提交详情页用（一栏 1200 宽，多行输出对照着看）；放不下（窄于 600，比如手机）就退回竖排
+   * 不给的话是原来那张浅灰卡片
+   */
+  section?: 'stack' | 'row'
 }>()
 
 const theme = useThemeVars()
@@ -114,39 +124,48 @@ function lines(text: string) {
 </script>
 
 <template>
-  <div class="explain-card">
-    <p v-if="check.passed" class="explain">题目里的例子都对了，没通过的是隐藏的测试点。想想特殊情况：最大的数、最小的数、0、负数，或者题目里专门提到的情况。</p>
-    <template v-else>
-      <p class="explain">
-        <b>例子 {{ (check.index ?? 0) + 1 }} 没有通过{{ plain ? '。' : '：' }}</b
-        ><template v-if="!plain">{{ hint }}</template>
-      </p>
+  <div :class="section ? ['explain-section', section] : 'explain-card'">
+    <template v-if="section">
+      <SectionHead icon="problem" tone="amber">
+        {{ check.passed ? '例子都对了，错在没给你看的测试点' : `例子 ${(check.index ?? 0) + 1} 没对上` }}
+      </SectionHead>
+      <p v-if="check.passed" class="explain">想想特殊情况：最大的数、最小的数、0、负数，或者题目里专门提到的情况。</p>
+      <p v-else-if="!plain" class="explain">{{ hint }}</p>
+    </template>
+    <p v-else-if="check.passed" class="explain">
+      题目里的例子都对了，没通过的是隐藏的测试点。想想特殊情况：最大的数、最小的数、0、负数，或者题目里专门提到的情况。
+    </p>
+    <p v-else class="explain">
+      <b>例子 {{ (check.index ?? 0) + 1 }} 没有通过{{ plain ? '。' : '：' }}</b
+      ><template v-if="!plain">{{ hint }}</template>
+    </p>
+    <template v-if="!check.passed">
       <div class="blocks">
-        <div class="block">
+        <div class="block in">
           <div class="label">输入</div>
           <div class="text">
             <div v-for="(line, i) in (check.input ?? '').split('\n')" :key="i" class="line" v-text="line" />
           </div>
         </div>
-        <div class="block">
+        <div class="block ok">
           <div class="label">正确输出</div>
           <div class="text">
             <template v-for="(line, i) in lines(check.expected ?? '')" :key="i">
-              <div v-if="i === diffLine && diffParts?.expected" class="line">
+              <div v-if="i === diffLine && diffParts?.expected" class="line hit">
                 <span v-text="diffParts.expected.before" /><span class="diff" v-text="diffParts.expected.marked" /><span v-text="diffParts.expected.after" />
               </div>
-              <div v-else class="line" v-text="line" />
+              <div v-else class="line" :class="{ hit: i === diffLine }" v-text="line" />
             </template>
           </div>
         </div>
-        <div class="block">
+        <div class="block bad">
           <div class="label">{{ peer ? '学生' : '你' }}的输出</div>
           <div v-if="check.output" class="text">
             <template v-for="(line, i) in lines(check.output)" :key="i">
-              <div v-if="i === diffLine && diffParts?.output" class="line">
+              <div v-if="i === diffLine && diffParts?.output" class="line hit">
                 <span v-text="diffParts.output.before" /><span class="diff" v-text="diffParts.output.marked" /><span v-text="diffParts.output.after" />
               </div>
-              <div v-else class="line" v-text="line" />
+              <div v-else class="line" :class="{ hit: i === diffLine }" v-text="line" />
             </template>
           </div>
           <div v-else class="text empty">（什么都没有输出）</div>
@@ -241,4 +260,145 @@ function lines(text: string) {
   color: v-bind('theme.textColor2');
   line-height: 1.6;
 }
+
+/*
+ * 题目页结果页签（section）：标签一列、格子一列，输入灰、正确输出绿、你的输出红。
+ * .block 用 display: contents 把「标签 + 格子」直接摊进这张两列的网格
+ */
+.explain-section {
+  display: flex;
+  flex-direction: column;
+}
+
+.explain-section .explain {
+  margin: 0 0 10px;
+  font-size: 16px;
+  line-height: 1.75;
+}
+
+.explain-section .blocks {
+  grid-template-columns: 64px minmax(0, 1fr);
+  gap: 6px 8px;
+  align-items: start;
+}
+
+.explain-section .block {
+  display: contents;
+}
+
+.explain-section .label {
+  margin: 0;
+  font-size: 13px;
+  line-height: 36px;
+  white-space: nowrap;
+}
+
+.explain-section .bad .label {
+  font-weight: 600;
+  color: v-bind('theme.errorColor');
+}
+
+.explain-section .text {
+  min-width: 0;
+  padding: 5px 10px;
+  border-radius: 6px;
+  font-size: 16px;
+  line-height: 24px;
+  max-height: 260px;
+}
+
+.explain-section .text.empty {
+  font-size: 14px;
+}
+
+.explain-section .in .text {
+  background-color: rgba(128, 128, 128, 0.07);
+  border: 1px solid rgba(128, 128, 128, 0.14);
+}
+
+.explain-section .ok .text {
+  background-color: rgba(24, 160, 88, 0.08);
+  border: 1px solid rgba(24, 160, 88, 0.26);
+}
+
+.explain-section .bad .text {
+  background-color: rgba(208, 48, 80, 0.06);
+  border: 1px solid rgba(208, 48, 80, 0.24);
+}
+
+.explain-section .line {
+  min-height: 24px;
+}
+
+.explain-section .cut {
+  grid-column: 2;
+}
+
+.explain-section .requirement {
+  margin-top: 10px;
+  font-size: 14px;
+  color: v-bind('theme.textColor3');
+}
+
+/*
+ * 横排（row，提交详情页）：三格并排，标签在格子上面；行的左右留白挪到每一行上，
+ * 不一样的那行垫的浅黄才能铺满整格宽、两边对齐
+ */
+.explain-section.row {
+  container: explain-row / inline-size;
+}
+
+.explain-section.row .blocks {
+  grid-template-columns: repeat(3, minmax(0, 1fr));
+  gap: 10px;
+}
+
+.explain-section.row .block {
+  display: flex;
+  flex-direction: column;
+  gap: 4px;
+  min-width: 0;
+  padding: 0;
+  border: 0;
+  border-radius: 0;
+  background: none;
+}
+
+.explain-section.row .label {
+  line-height: 1.5;
+}
+
+.explain-section.row .text {
+  padding: 6px 0;
+  line-height: 26px;
+}
+
+.explain-section.row .line {
+  min-height: 26px;
+  padding: 0 12px;
+}
+
+.explain-section.row .text.empty {
+  padding: 6px 12px;
+}
+
+.explain-section.row .line.hit {
+  background-color: rgba(227, 160, 8, 0.14);
+}
+
+/* 放不下三格（窄于 600：手机、课堂任务的弹窗）就退回竖排 */
+@container explain-row (max-width: 600px) {
+  .explain-section.row .blocks {
+    grid-template-columns: 64px minmax(0, 1fr);
+    gap: 6px 8px;
+  }
+
+  .explain-section.row .block {
+    display: contents;
+  }
+
+  .explain-section.row .label {
+    line-height: 36px;
+  }
+}
 </style>

apps/web/src/oj/problem/composables/mascotGuide.ts

@@ -0,0 +1,273 @@
+import { useBreakpoints } from 'shared/composables/breakpoints'
+import { useMascotGuide, type MascotAction, type MascotGuide } from 'shared/mascot/guide'
+import { HINT_MIN_FAILURES, isFlowchartPass } from '@oj2/contract'
+import { habitSituation, logMascotEvent, refreshMascotProfile, requestSpeech } from 'shared/mascot/behavior'
+import { useChallengeStore } from 'oj/store/challenge'
+import { useFlowchartStore } from 'oj/store/flowchart'
+import type { MascotSituation } from 'shared/mascot/lines'
+import { useCollabStore } from 'shared/store/collab'
+import { useLessonStore } from 'shared/store/lesson'
+import { useUserStore } from 'shared/store/user'
+import { useCodeStore } from 'oj/store/code'
+import { useProblemStore } from 'oj/store/problem'
+import { useSubmissionStore, type ResultSegment } from 'oj/store/submission'
+import { SubmissionStatus } from 'utils/constants'
+import type { ProblemDetail } from 'utils/types'
+import { useProblemPageContext } from './problemPageContext'
+import { useTeacherCollab } from './teacherCollab'
+
+/** 同一道题错到这么多次，她就不怼了，劝去举手 */
+const STUCK_FAILS = 5
+/** 错过这么多次以后做对，算「终于」 */
+const FINALLY_FAILS = 2
+
+const RESULT_SITUATION: Partial<Record<SubmissionStatus, MascotSituation>> = {
+  [SubmissionStatus.wrong_answer]: 'problem.wrong',
+  [SubmissionStatus.partial_accepted]: 'problem.wrong',
+  [SubmissionStatus.ast_check_failed]: 'problem.wrong',
+  [SubmissionStatus.compile_error]: 'problem.compileError',
+  [SubmissionStatus.runtime_error]: 'problem.runtimeError',
+  [SubmissionStatus.memory_limit_exceeded]: 'problem.runtimeError',
+  [SubmissionStatus.cpu_time_limit_exceeded]: 'problem.timeout',
+  [SubmissionStatus.real_time_limit_exceeded]: 'problem.timeout',
+}
+
+/** 一道题上这么久没交、没跑例子，她就来问一句（主动开口） */
+const IDLE_MS = 15 * 60_000
+/** 连着这么多次没跑例子就交，而且错了，她就念一句 */
+const UNSAMPLED_SUBMITS = 3
+/** 同班做对这么多人，就拿出来说「全班已经 N 个人做对了」 */
+const CLASS_MANY = 5
+/** 同班交过这么多人、做对的不超过 CLASS_FEW 个，算「全班都卡着」 */
+const CLASS_TRIED = 5
+const CLASS_FEW = 2
+/** 全站交过这么多次，通过率才有意义 */
+const RATE_MIN_SUBMISSIONS = 30
+const HARD_RATE = 0.3
+const EASY_RATE = 0.7
+
+/** 几种「换个说法」各自的机会：不是每次都说同一件事 */
+const CHANCE = { classMany: 0.3, classFew: 0.5, rate: 0.4, hint: 0.5, challenge: 0.4 } as const
+const roll = (chance: number) => Math.random() < chance
+
+const FINISHED = (result: number | undefined) =>
+  result !== undefined && result !== SubmissionStatus.pending && result !== SubmissionStatus.judging && result !== SubmissionStatus.submitting
+
+/**
+ * 题目页上看板娘说什么、给哪几个按钮。看的是这一页上最近的那件事：刚交的结果、刚跑的例子，
+ * 都没有就看写没写代码。比赛入口不用管（Mascot.vue 在比赛里不弹）。
+ *
+ * 另外几件事她会主动开口（只对学生，频率上限在 Mascot.vue）：同一道题错到第 5 次、连着 3 次
+ * 没跑例子就交还错了、又犯了自己的老毛病（behavior.ts 的 habitSituation）、15 分钟没交没跑。
+ *
+ * `showResult` 是「我错在哪」：把左栏切到「结果」页签的那一段（提交结果 / 运行例子），页签归页面管。
+ */
+export function useProblemMascotGuide(showResult: (segment: ResultSegment) => void) {
+  const router = useRouter()
+  const userStore = useUserStore()
+  const problemStore = useProblemStore()
+  const submissionStore = useSubmissionStore()
+  const codeStore = useCodeStore()
+  const collabStore = useCollabStore()
+  const lessonStore = useLessonStore()
+  const ctx = useProblemPageContext()
+  const teacherCollab = useTeacherCollab()
+  const { isDesktop } = useBreakpoints()
+  const flowchartStore = useFlowchartStore()
+  const challengeStore = useChallengeStore()
+
+  /** 学生在这道题上能用的几个按钮，点她和她主动开口共用 */
+  function studentActions(problem: ProblemDetail) {
+    const language = codeStore.code.language
+    const entry = ctx.value
+    const runSamples: MascotAction | null =
+      problem.samples.length && language !== 'Flowchart' && language !== 'SQL' ? { label: '运行例子', run: submissionStore.runSamples } : null
+    // 和工具栏的「举手求助」同一个条件；已经举着手、老师在帮的时候不给
+    const help: MascotAction | null =
+      entry.help && isDesktop.value && !userStore.demoMode && language !== 'Flowchart' && collabStore.helpStatus === 'idle'
+        ? { label: '举手求助', run: () => collabStore.requestHelp(problem._id, language) }
+        : null
+    const why: MascotAction = { label: '我错在哪', run: () => showResult('submit') }
+    const whySamples: MascotAction = { label: '我错在哪', run: () => showResult('samples') }
+    const busy = submissionStore.isFormatting || submissionStore.isSubmittingRequest || submissionStore.judging || submissionStore.isCooldown
+    const submit: MascotAction | null = busy
+      ? null
+      : { label: '提交', run: () => submissionStore.submit({ contestId: entry.contestId, problemSetId: entry.problemSetId }) }
+    return { runSamples, help, why, whySamples, submit }
+  }
+
+  const guide = (situation: MascotSituation, ...actions: (MascotAction | null)[]): MascotGuide => ({
+    situation,
+    actions: actions.filter((it): it is MascotAction => !!it),
+  })
+
+  useMascotGuide(() => {
+    const problem = problemStore.problem
+    if (!problem) return null
+
+    if (userStore.isTeacherOrAbove) {
+      // 协作中别把老师带离这一页：跳走协作就断了
+      if (teacherCollab.value) return null
+      const actions: MascotAction[] = [{ label: '全班这题的提交', run: () => router.push({ name: 'submissions', query: { problem: problem._id } }) }]
+      if (isDesktop.value && userStore.canEditProblem(problem)) {
+        actions.push({ label: '编辑这道题', run: () => window.open(router.resolve(`/admin/problem/edit/${problem.id}`).href, '_blank') })
+      }
+      return { situation: 'teacher.problem', actions }
+    }
+
+    const entry = ctx.value
+    const { runSamples, help, why, whySamples, submit } = studentActions(problem)
+
+    if (codeStore.code.language === 'Flowchart') {
+      // 画过、评过分了：分低就说分低，拿了 S 夸一句
+      const grade = flowchartStore.latestRating.grade
+      if (grade === 'S') return guide('flowchart.good', help)
+      if (grade && !isFlowchartPass(grade)) return guide('flowchart.low', help)
+      return guide('problem.flowchart', help)
+    }
+    // 正在判、正在跑例子：没什么好说的，打个招呼
+    if (submissionStore.judging || submissionStore.pending || submissionStore.trial.samplesRunning.value) return null
+
+    const stuck = problemStore.failCount >= STUCK_FAILS
+    if (submissionStore.syntaxErrorInfo) return stuck ? guide('problem.stuck', help, why) : guide('problem.compileError', why, help)
+
+    const runs = submissionStore.trial.sampleRuns.value
+    if (submissionStore.resultSegment === 'samples' && runs.length) {
+      return runs.every((run) => run.result === SubmissionStatus.accepted)
+        ? guide('problem.samplesPassed', submit)
+        : guide('problem.samplesFailed', whySamples, help)
+    }
+
+    const result = submissionStore.submission?.result
+    const lesson = lessonStore.find(problem._id)
+    if (result === SubmissionStatus.accepted) {
+      const next = nextAction()
+      // 课堂条的数是拉的时候的，刚做对重拉回来可能已经把自己算进去了
+      if (lesson && lesson.acceptedCount <= (lesson.myStatus === 'accepted' ? 1 : 0)) return guide('class.firstSolver', next)
+      if (entry.challenges && challengeStore.current?.challenges.length && roll(CHANCE.challenge)) return guide('problem.challenge', next)
+      const fails = problemStore.failCount
+      return guide(fails === 0 ? 'problem.firstTry' : fails >= FINALLY_FAILS ? 'problem.finally' : 'problem.accepted', next)
+    }
+    const failed = result === undefined ? undefined : RESULT_SITUATION[result as SubmissionStatus]
+    if (failed) {
+      if (stuck) return guide('problem.stuck', help, why)
+      const actions = [why, failed === 'problem.wrong' ? runSamples : null, help]
+      // AI 提示开了还没要：提一句，按钮带去结果里（提示在那儿）
+      const hintOpen = !problem.contestId && problemStore.failCount >= HINT_MIN_FAILURES && !submissionStore.hint.hintContent.value
+      if (hintOpen && roll(CHANCE.hint)) return guide('problem.hintReady', ...actions)
+      const classGuide = classSituation(lesson)
+      if (classGuide) return { ...guide(classGuide.situation, ...actions), n: classGuide.n }
+      const rate = problem.submissionNumber >= RATE_MIN_SUBMISSIONS ? problem.acceptedNumber / problem.submissionNumber : null
+      if (rate !== null && rate < HARD_RATE && roll(CHANCE.rate)) return guide('problem.hardWrong', ...actions)
+      if (rate !== null && rate > EASY_RATE && failed === 'problem.wrong' && roll(CHANCE.rate)) return guide('problem.easyWrong', ...actions)
+      return guide(failed, ...actions)
+    }
+
+    // 这两种只说话、只留举手：上线第一天「做过了」的「下一道」没人点过，空着代码跑例子也没意义，
+    // 而空白页上「举手求助」是真有人点（不会下手）。没有按钮的气泡 5 秒自己收起，不一直挡着
+    if (problem.myStatus === SubmissionStatus.accepted) return guide('problem.solvedBefore')
+    if (codeStore.code.value.trim().length < 10) return guide(entry.entry === 'problemset' ? 'problem.inSet' : 'problem.blank', help)
+    const classGuide = classSituation(lesson)
+    if (classGuide?.situation === 'class.manyDone') return { ...guide('class.manyDone', runSamples, help), n: classGuide.n }
+    return guide('problem.unsubmitted', runSamples, help)
+
+    /** 这节课的题：同班多少人做对了（课堂条那份数），不在这节课里就没有 */
+    function classSituation(item: typeof lesson) {
+      if (!item || item.myStatus === 'accepted') return null
+      if (item.acceptedCount >= CLASS_MANY && roll(CHANCE.classMany)) return { situation: 'class.manyDone' as const, n: item.acceptedCount }
+      if (item.userCount >= CLASS_TRIED && item.acceptedCount <= CLASS_FEW && roll(CHANCE.classFew))
+        return { situation: 'class.fewDone' as const, n: item.acceptedCount }
+      return null
+    }
+
+    /** 做对之后去哪：专题里回专题，这节课里去下一道还没做的 */
+    function nextAction(): MascotAction | null {
+      if (entry.entry === 'problemset') return { label: '回专题', run: () => router.push(`/problemset/${entry.problemSetId}`) }
+      const next = lessonStore.nextAfter(problem!._id)?.next
+      return next ? { label: '下一道', run: () => router.push(`/problem/${next.problemDisplayId}`) } : null
+    }
+  })
+
+  // ---- 主动开口（只对学生；比赛里 Mascot.vue 不弹）----
+
+  const student = () => userStore.isAuthed && !userStore.isTeacherOrAbove && ctx.value.entry !== 'contest'
+
+  /** 这道题上连着几次没跑例子就交了。跑过一次例子就清零 */
+  let unsampledSubmits = 0
+  let sampledSinceSubmit = false
+  /** 上一次「动静」（进题、交、跑例子）的时刻，给「盯了好久」用 */
+  let lastActivity = Date.now()
+
+  watch(
+    () => problemStore.problem?.id,
+    () => {
+      unsampledSubmits = 0
+      sampledSinceSubmit = false
+      lastActivity = Date.now()
+    },
+  )
+  watch(
+    () => submissionStore.trial.samplesRunAt.value,
+    (at) => {
+      if (!at) return
+      sampledSinceSubmit = true
+      lastActivity = Date.now()
+      if (student()) logMascotEvent({ kind: 'trial', action: 'samples' })
+    },
+  )
+  // 「运行例子」「自己输入」「举手」别处都不存，记下来给她看一周的习惯（behavior.ts）
+  watch(
+    () => submissionStore.trial.customRunning.value,
+    (running) => {
+      if (!running) return
+      lastActivity = Date.now()
+      if (student()) logMascotEvent({ kind: 'trial', action: 'custom' })
+    },
+  )
+  watch(
+    () => collabStore.helpStatus,
+    (status, previous) => {
+      if (status === 'pending' && previous === 'idle' && student()) logMascotEvent({ kind: 'help' })
+    },
+  )
+  watch(
+    () => submissionStore.submission?.id,
+    (id) => {
+      if (!id) return
+      unsampledSubmits = sampledSinceSubmit ? 0 : unsampledSubmits + 1
+      sampledSinceSubmit = false
+      lastActivity = Date.now()
+    },
+  )
+
+  // 判完了：错了就看要不要说一句；不管对错都刷新行为数（最近的错、今天做对几道）
+  watch(
+    () => [submissionStore.submission?.id, submissionStore.submission?.result] as const,
+    ([id, result]) => {
+      const problem = problemStore.problem
+      if (!id || !FINISHED(result) || !problem || !student()) return
+      refreshMascotProfile(true)
+      const failed = RESULT_SITUATION[result as SubmissionStatus]
+      if (!failed) return
+      const { runSamples, help, why } = studentActions(problem)
+      if (problemStore.failCount >= STUCK_FAILS) {
+        requestSpeech({ key: `stuck:${problem.id}`, ...guide('problem.stuck', help, why) })
+      } else if (unsampledSubmits >= UNSAMPLED_SUBMITS && runSamples) {
+        requestSpeech({ key: `unsampled:${problem.id}`, ...guide('habit.noSamples', runSamples) })
+      } else {
+        const habit = habitSituation(failed)
+        if (habit) requestSpeech({ key: `habit:${habit}`, ...guide(habit, why) })
+      }
+    },
+  )
+
+  // 盯着一道没做对的题 15 分钟，没交也没跑：问一句
+  useIntervalFn(() => {
+    const problem = problemStore.problem
+    if (!problem || !student() || Date.now() - lastActivity < IDLE_MS) return
+    if (problem.myStatus === SubmissionStatus.accepted || submissionStore.submission?.result === SubmissionStatus.accepted) return
+    if (codeStore.code.language === 'Flowchart') return
+    const { runSamples, help } = studentActions(problem)
+    requestSpeech({ key: `idle:${problem.id}`, ...guide('idle.stuck', help, runSamples) })
+  }, 30_000)
+}

apps/web/src/oj/problem/composables/useFireworks.ts

@@ -14,28 +14,36 @@ const EMOJI_SVGS = [
 // 将 emoji SVG 转成 confetti 可用的彩色位图 Shape，缓存后供重复调用复用
 let emojiShapesPromise: Promise<confetti.Shape[]> | null = null
 
+/**
+ * 表情在屏幕上的边长（px）。位图就按这个大小画，放的时候 `scalar: 1`、矩阵不缩放。
+ *
+ * **别改回「位图画大、矩阵缩小、scalar 放大」**：canvas-confetti 画位图粒子是每帧
+ * `fillRect(位图边长 × scalar)` 再用图案填，填的矩形和表情实际多大无关。原来位图 64、
+ * scalar 5，表情显示 50px，每个粒子每帧却要填 320×320 —— 两团 32 个粒子一帧三百多万像素，
+ * 机房电脑（显卡弱、Chrome 常走软件渲染）放到这一种就卡（用户 2026-11 反馈）。
+ * 现在填的正好是 50×50，同样大小、同样轨迹，像素少到四十分之一。
+ */
+const EMOJI_PX = 50
+
 function svgToBitmapShape(svg: string): Promise<confetti.Shape> {
   return new Promise((resolve, reject) => {
     const blob = new Blob([svg], { type: 'image/svg+xml' })
     const url = URL.createObjectURL(blob)
     const img = new Image()
     img.onload = async () => {
-      const renderSize = 64
-      const baseUnit = 10
       const canvas = document.createElement('canvas')
-      canvas.width = renderSize
-      canvas.height = renderSize
+      canvas.width = EMOJI_PX
+      canvas.height = EMOJI_PX
       const ctx = canvas.getContext('2d')!
-      ctx.drawImage(img, 0, 0, renderSize, renderSize)
+      ctx.drawImage(img, 0, 0, EMOJI_PX, EMOJI_PX)
       URL.revokeObjectURL(url)
 
       try {
         const bitmap = await createImageBitmap(canvas)
-        const scale = baseUnit / renderSize
         resolve({
           type: 'bitmap',
           bitmap,
-          matrix: [scale, 0, 0, scale, (-renderSize * scale) / 2, (-renderSize * scale) / 2],
+          matrix: [1, 0, 0, 1, -EMOJI_PX / 2, -EMOJI_PX / 2],
         } as unknown as confetti.Shape)
       } catch (e) {
         reject(e)
@@ -415,7 +423,8 @@ export function useFireworks() {
           const options: confetti.Options = {
             shapes: emojiShapes,
             flat: true,
-            scalar: 5,
+            // 大小在位图里（EMOJI_PX），这里放大的话填的矩形跟着放大，见 EMOJI_PX
+            scalar: 1,
             particleCount: 16,
             spread: 360,
             startVelocity: 40,

apps/web/src/oj/problem/detail.vue

@@ -1,4 +1,5 @@
 <script setup lang="ts">
+import { Icon } from '@iconify/vue'
 import { useThemeVars } from 'naive-ui'
 import { errorCode } from 'utils/api'
 import { getProblem } from 'oj/api'
@@ -19,6 +20,7 @@ import ContextBar from './components/ContextBar.vue'
 import { useEditorMenu } from './composables/editorMenu'
 import { DRAWER_TITLE, useProblemPageContext, type ProblemDrawer as DrawerKey } from './composables/problemPageContext'
 import { useCollabHere, useTeacherCollab } from './composables/teacherCollab'
+import { useProblemMascotGuide } from './composables/mascotGuide'
 
 // 抽成具名 loader，便于进页面时与接口并行预取编辑器 chunk。
 // 题库、比赛、专题三种入口用的是同一个编辑器：原来比赛和专题用的是另一个精简版，
@@ -120,6 +122,13 @@ watch(
 )
 const drawerLabel = (key: DrawerKey) => (key === 'submission' && teacherCollab.value ? '学生的提交' : DRAWER_TITLE[key])
 
+/** 抽屉按钮前的小图标：页签行右边三个不带框的按钮，和左边的页签分得开（原来是三个圆角胶囊，看着像另一组页签） */
+const DRAWER_ICON: Record<DrawerKey, string> = {
+  info: 'ph:chart-bar',
+  reaction: 'ph:chat-circle',
+  submission: 'ph:clock-counter-clockwise',
+}
+
 function toggleDrawer(key: DrawerKey) {
   drawer.value = drawer.value === key ? null : key
 }
@@ -208,6 +217,13 @@ watch(
   },
 )
 
+// 看板娘气泡里的「我错在哪」：切到「结果」页签里出错的那一段
+useProblemMascotGuide((segment) => {
+  drawer.value = null
+  currentTab.value = 'result'
+  submissionStore.resultSegment = segment
+})
+
 // 结果页签的标题带状态图标（ResultTabLabel），n-tab-pane 的 tab 接受渲染函数
 const resultTab = () => h(ResultTabLabel, { active: currentTab.value === 'result' })
 
@@ -306,7 +322,7 @@ onBeforeUnmount(() => {
             </div>
             <div v-if="ctx.drawers.length" class="drawer-buttons">
               <button v-for="key in ctx.drawers" :key="key" type="button" class="drawer-button" @click="toggleDrawer(key)">
-                {{ drawerLabel(key) }}
+                <Icon :icon="DRAWER_ICON[key]" :width="16" aria-hidden="true" />{{ drawerLabel(key) }}
               </button>
             </div>
           </div>
@@ -409,26 +425,46 @@ onBeforeUnmount(() => {
   cursor: col-resize;
 }
 
+/*
+ * 左栏：课堂的时候最左边是一条竖栏（ContextBar 的 .lesson-rail），竖栏右边从上到下是
+ * 专题 / 比赛条、页签行、正文。两个页签的正文叠在同一格里，v-show 只显示一个
+ */
 .left-pane {
   position: relative;
   height: 100%;
-  display: flex;
-  flex-direction: column;
+  display: grid;
+  grid-template-columns: auto minmax(0, 1fr);
+  grid-template-rows: auto auto minmax(0, 1fr);
   overflow: hidden;
 }
 
+.left-pane > :deep(.lesson-rail) {
+  grid-column: 1;
+  grid-row: 1 / -1;
+}
+
+.left-pane > :deep(.context-bar),
+.left-pane > .tab-row {
+  grid-column: 2;
+}
+
+.left-pane > .pane-body {
+  grid-column: 2;
+  grid-row: 3;
+}
+
 .right-pane {
   height: 100%;
 }
 
-/* 「题目 / 结果」：下划线式页签，右边是抽屉的三个胶囊按钮。
+/* 「题目 / 结果」：下划线式页签，右边是抽屉的三个按钮（图标 + 字，不带框）。
    高度和右栏工具栏、抽屉头部一样是 48（设计稿画的 42）：没有上下文条时两边并排，
    差 6px 的话两条下边线在分隔线处错成一个台阶 */
 .tab-row {
   flex: none;
   height: 48px;
   box-sizing: border-box;
-  padding: 0 20px 0 12px;
+  padding: 0 10px 0 8px;
   display: flex;
   align-items: center;
   gap: 2px;
@@ -460,24 +496,32 @@ onBeforeUnmount(() => {
 .drawer-buttons {
   margin-left: auto;
   display: flex;
-  gap: 4px;
+  gap: 2px;
 }
 
 .drawer-button {
   height: 32px;
-  padding: 0 11px;
-  border: 1px solid v-bind('theme.borderColor');
-  border-radius: 16px;
+  padding: 0 9px;
+  border: 0;
+  border-radius: 6px;
   background: transparent;
+  display: inline-flex;
+  align-items: center;
+  gap: 5px;
   font: inherit;
-  font-size: 13px;
+  font-size: 14px;
   color: v-bind('theme.textColor2');
+  white-space: nowrap;
   cursor: pointer;
 }
 
+.drawer-button svg {
+  color: v-bind('theme.textColor3');
+}
+
 .drawer-button:hover {
-  border-color: v-bind('theme.primaryColorHover');
-  color: v-bind('theme.primaryColor');
+  background-color: rgba(128, 128, 128, 0.1);
+  color: v-bind('theme.textColor1');
 }
 
 .pane-body {

apps/web/src/oj/problem/list.vue

@@ -18,6 +18,7 @@ import { usePagination } from 'shared/composables/pagination'
 import { useAuthModalStore } from 'shared/store/authModal'
 import AdminLink from 'shared/components/AdminLink.vue'
 import { useUserStore } from 'shared/store/user'
+import { focusJumpAction, useMascotGuide, type MascotAction } from 'shared/mascot/guide'
 import ProblemStatus from './components/ProblemStatus.vue'
 import ProblemTypeTag from './components/ProblemTypeTag.vue'
 import ProgressRow from './components/ProgressRow.vue'
@@ -272,6 +273,18 @@ async function pickRandom() {
   }
 }
 
+// 看板娘：学生给找题的几条路（「随便来一道」按这页选着的知识点和类型挑），老师给新建题目
+useMascotGuide(() => {
+  if (teacher.value) {
+    return {
+      situation: 'teacher.problems',
+      actions: userStore.hasProblemPermission ? [{ label: '新建题目', run: () => router.push('/admin/problem/create') }] : [],
+    }
+  }
+  const undone: MascotAction | null = userStore.isAuthed && !undoneOn.value ? { label: '只看没做完', run: () => (undoneOn.value = true) } : null
+  return { situation: 'problems', actions: [focusJumpAction(), ...(undone ? [undone] : []), { label: '随便来一道', run: pickRandom }] }
+})
+
 // ---- 「只看没做完」下一道都没有了：说清楚为什么是空的，给两条路 ----
 const nextTag = computed(() => {
   const p = mine.value

apps/web/src/oj/problem/utils/statement.ts

@@ -0,0 +1,14 @@
+/**
+ * 题面正文（描述 / 输入 / 输出 / 提示）在渲染前去掉空段落。
+ *
+ * 库里的题面多是 wangEditor 时代的 HTML，老师为了「隔开一点」敲的空行存成
+ * `<p><br></p>`、`<p>&nbsp;</p>`，每个都撑出一整行高的缝（2020 一道题就有两处）。
+ * 段落之间的间距题面自己会给，这些空段落一律去掉。只动「整段什么字都没有」的，
+ * 段落里带图片、带字的都不碰。
+ */
+const EMPTY_PARAGRAPH = /<p(?:\s[^>]*)?>(?:\s|&nbsp;|&#160;| |<br\s*\/?>)*<\/p>/gi
+
+export function tidyStatement(html: string | null | undefined): string {
+  if (!html) return ''
+  return html.replace(EMPTY_PARAGRAPH, '')
+}

apps/web/src/oj/problemset/detail.vue

@@ -8,6 +8,7 @@ import { parseTime } from 'utils/functions'
 import type { ProblemSet, ProblemSetProblem } from 'utils/types'
 import { useAuthModalStore } from 'shared/store/authModal'
 import { useUserStore } from 'shared/store/user'
+import { goAction, useMascotGuide } from 'shared/mascot/guide'
 import { useFireworks } from '../problem/composables/useFireworks'
 import NotFound from 'shared/components/NotFound.vue'
 import BadgeLadder from './components/BadgeLadder.vue'
@@ -122,6 +123,20 @@ async function join() {
   }
 }
 
+// 看板娘：老师看全班，学生还差几道必做题、带去下一道；没加入就只打招呼
+useMascotGuide(() => {
+  if (!set.value) return null
+  if (userStore.isTeacherOrAbove) return { situation: 'teacher.problemset', actions: [{ label: '全班情况', run: () => (tab.value = 'class') }] }
+  if (!joined.value) return null
+  const todo = problems.value.filter((item) => item.isRequired && !item.isCompleted)
+  const next = todo[0]
+  if (progress.value?.isCompleted || !next) return { situation: 'problemset.done', actions: [goAction(router, '专题列表', '/problemset')] }
+  const actions = [{ label: '去做下一道', run: () => router.push(problemLink(next)) }]
+  // 只剩最后一道、做完还有奖章没拿：说「就差最后 1 道」比「还差 1 道」更想让人做完
+  if (todo.length === 1 && set.value.badges.some((badge) => !badge.isEarned)) return { situation: 'problemset.lastOne', actions }
+  return { situation: 'problemset.unfinished', n: todo.length, actions }
+})
+
 /** 编辑只给出题人和超管（后台按归属校验，别人点进去是 404） */
 const canEdit = computed(() => !!set.value && (userStore.isSuperAdmin || set.value.createdBy.id === userStore.user?.id))
 

apps/web/src/oj/problemset/list.vue

@@ -3,6 +3,7 @@ import { useThemeVars } from 'naive-ui'
 import AdminLink from 'shared/components/AdminLink.vue'
 import { useBreakpoints } from 'shared/composables/breakpoints'
 import { useUserStore } from 'shared/store/user'
+import { goAction, useMascotGuide } from 'shared/mascot/guide'
 import { getProblemSetList } from 'oj/api'
 import { rgba, useTone } from 'shared/composables/tone'
 import { parseTime } from 'utils/functions'
@@ -55,6 +56,16 @@ const others = computed(() =>
     }),
 )
 
+// 看板娘：加入了还没做完的专题，布置中的优先，其次最近加入的
+useMascotGuide(() => {
+  if (userStore.isTeacherOrAbove) return null
+  const pending = sets.value.filter((set) => set.userProgress.isJoined && !set.userProgress.isCompleted)
+  const latest = (set: ProblemSet) => Date.parse(set.userProgress.joinTime ?? '') || 0
+  const target = pending.find((set) => set.assigning) ?? [...pending].sort((a, b) => latest(b) - latest(a))[0]
+  if (!target) return null
+  return { situation: 'problemsets.unfinished', actions: [goAction(router, '接着做', `/problemset/${target.id}`)] }
+})
+
 function description(set: ProblemSet) {
   // 简介大多就是把标题再抄一遍，一样的就不重复显示
   return set.description && set.description !== set.title ? set.description : ''
@@ -83,6 +94,8 @@ const doneBackground = computed(() => rgba(theme.value.successColor, 0.05))
   <div class="page oj-page">
     <div class="top">
       <h2>专题</h2>
+      <!-- 没有布置中的，就只有一组：数量写在标题旁边，不再另起一行「专题 14 个」把标题再说一遍 -->
+      <span v-if="!assigning.length && others.length" class="muted count">{{ others.length }} 个</span>
       <div class="spacer"></div>
       <n-input v-model:value="keyword" placeholder="搜专题" clearable class="search" />
       <!-- 手机上一行放不下，也没人在手机上出题，只给电脑 -->
@@ -133,8 +146,8 @@ const doneBackground = computed(() => rgba(theme.value.successColor, 0.05))
       </div>
     </template>
 
-    <div v-if="others.length" class="sect">
-      {{ assigning.length ? '其他专题' : '专题' }}
+    <div v-if="assigning.length && others.length" class="sect">
+      其他专题
       <span class="muted">{{ others.length }} 个</span>
     </div>
     <div class="small-grid">
@@ -191,6 +204,12 @@ const doneBackground = computed(() => rgba(theme.value.successColor, 0.05))
   font-size: var(--oj-fs-title);
 }
 
+/* 和分组标题旁的「N 个」同一档：小字、不加粗 */
+.top .count {
+  font-size: var(--oj-fs-sec);
+  font-weight: 400;
+}
+
 .search {
   width: 220px;
 }

apps/web/src/oj/rank/list.vue

@@ -7,6 +7,7 @@ import UserName from 'shared/components/UserName.vue'
 import { useBreakpoints } from 'shared/composables/breakpoints'
 import { useConfigStore } from 'shared/store/config'
 import { useUserStore } from 'shared/store/user'
+import { useMascotGuide } from 'shared/mascot/guide'
 import { errorCode } from 'utils/api'
 import { displayName } from '@oj2/contract'
 import { STORAGE_KEY } from 'utils/constants'
@@ -271,6 +272,23 @@ function openDetail(className: string) {
   showDetail.value = true
 }
 
+// 看板娘：自己在榜上就把自己那一行滚到眼前（领奖台上是「你」那个标签，赛道上是高亮的那一行）
+useMascotGuide(() => {
+  if (teacher.value || !board.value) return null
+  const listed = rows.value.some((row) => row.user.id === meId.value)
+  const findMe = () => {
+    const el = document.querySelector('.track-card .entry.me, .track-card .prow.me, .track-card .tag.me')
+    el?.scrollIntoView({ behavior: 'smooth', block: 'center' })
+  }
+  const actions = listed ? [{ label: '我在哪', run: findMe }] : []
+  const { me: mine, ahead } = board.value
+  if (mine?.solved && mine.rank === 1) return { situation: 'rank.top', actions }
+  // 同分按先做到排，追平还在后面，所以要比前一名多做 1 道
+  const gap = mine && ahead ? ahead.solved - mine.solved : null
+  if (gap !== null && gap <= 5) return { situation: 'rank.gap', n: gap + 1, actions }
+  return { situation: 'rank', actions }
+})
+
 function open(username: string) {
   router.push({ path: '/user', query: { name: username } })
 }

apps/web/src/oj/rank/palette.ts

@@ -1,4 +1,4 @@
-import { useDark } from '@vueuse/core'
+import { useDark } from 'shared/composables/dark'
 
 /**
  * 排名页的几种颜色（设计稿「排名重设计」G1）。用户说「颜色可以保留」：你绿、前一名蓝、

apps/web/src/oj/statistics/index.vue

@@ -1,5 +1,6 @@
 <script setup lang="ts">
 import { useRouteQuery } from '@vueuse/router'
+import { useMascotGuide } from 'shared/mascot/guide'
 import StatisticsView from './components/StatisticsView.vue'
 import { DEFAULT_PERIOD } from './period'
 
@@ -19,6 +20,8 @@ const period = useRouteQuery<string>('period', DEFAULT_PERIOD, { mode: 'replace'
 const from = useRouteQuery<string>('from', '', { mode: 'replace' })
 const to = useRouteQuery<string>('to', '', { mode: 'replace' })
 
+useMascotGuide(() => ({ situation: 'teacher.statistics' }))
+
 function openList(query: Record<string, string>) {
   window.open(router.resolve({ name: 'submissions', query }).href, '_blank')
 }

apps/web/src/oj/submission/components/CodeView.vue

@@ -1,6 +1,6 @@
 <script setup lang="ts">
 import { useThemeVars } from 'naive-ui'
-import { useDark } from '@vueuse/core'
+import { useDark } from 'shared/composables/dark'
 
 /**
  * 只读的代码区：行号 + 高亮 + 可选地标红一行（编译失败 / 运行时错误报了行号时）。

apps/web/src/oj/submission/components/SubmissionPane.vue

@@ -23,6 +23,8 @@ import UserName from 'shared/components/UserName.vue'
  */
 const props = defineProps<{
   row: SubmissionListItem
+  /** 按 ↑ ↓ 会落到的上一条、下一条：这条加载完顺手把它们也拉回来，换条时不用等网络 */
+  neighbors?: SubmissionListItem[]
   /** 老师那套：重新判题、逐个测试点、复制两项收进「⋯」 */
   teacher: boolean
   /** 在比赛的提交列表里（不能重判，题目链接走比赛） */
@@ -61,7 +63,42 @@ const detail = ref<Submission | null>(null)
 const loading = ref(false)
 const failed = ref(false)
 
-const judging = computed(() => props.row.result === SubmissionStatus.pending || props.row.result === SubmissionStatus.judging)
+function isJudging(row: SubmissionListItem) {
+  return row.result === SubmissionStatus.pending || row.result === SubmissionStatus.judging
+}
+const judging = computed(() => isJudging(props.row))
+
+/**
+ * 同一条只发一次请求：预取的还在路上时按到了它，接着等那一个，不再发第二个
+ */
+const inflight = new Map<string, Promise<Submission>>()
+function fetchDetail(id: string) {
+  let request = inflight.get(id)
+  if (!request) {
+    request = getSubmission(id).finally(() => inflight.delete(id))
+    inflight.set(id, request)
+  }
+  return request
+}
+
+/**
+ * 预取上一条、下一条。只在这一条落定之后才做（按住 ↓ 一路划过去的那些行不预取），
+ * 进缓存的口径和 load() 一样：还在判的不要，列表和详情的结果对不上也不要。
+ *
+ * 没预取的时候，换到没看过的一条要先把代码区卸掉、转圈、再整个重新挂上 ——
+ * 2026-11 实测（生产构建、CPU 降速 6 倍）每次卡 60–100ms；走缓存的只换内容，不卡。
+ */
+function prefetch() {
+  for (const row of props.neighbors ?? []) {
+    if (!row.showLink || isJudging(row) || cache.get(row.id)?.result === row.result) continue
+    fetchDetail(row.id).then(
+      (res) => {
+        if (res.result === row.result) cache.set(row.id, res)
+      },
+      () => {},
+    )
+  }
+}
 
 // 每次加载一个序号：同一条先按「判题中」拉了一次、判完又拉一次时，晚回来的旧请求不能盖掉新的
 let loadSeq = 0
@@ -78,15 +115,17 @@ async function load() {
   const hit = cache.get(row.id)
   if (hit && hit.result === row.result) {
     detail.value = hit
+    prefetch()
     return
   }
   loading.value = true
   try {
-    const res = await getSubmission(row.id)
+    const res = await fetchDetail(row.id)
     if (seq !== loadSeq) return
     // 列表那边还在判、详情这边已经判完了（或反过来）都不缓存，等两边对上
     if (!judging.value && res.result === props.row.result) cache.set(row.id, res)
     detail.value = res
+    prefetch()
   } catch {
     if (seq === loadSeq) failed.value = true
   } finally {

apps/web/src/oj/submission/components/SubmissionView.vue

@@ -310,7 +310,15 @@ function handleMore(key: string) {
         class="code"
       />
 
-      <WrongAnswerExplain v-if="sampleCheck" :check="sampleCheck" :code="shown.code" :language="shown.language" :plain="!!shown.contestId" :peer="!own" />
+      <WrongAnswerExplain
+        v-if="sampleCheck"
+        section="row"
+        :check="sampleCheck"
+        :code="shown.code"
+        :language="shown.language"
+        :plain="!!shown.contestId"
+        :peer="!own"
+      />
       <ExplainNote v-else-if="explain" :explain="explain" :tone="explainTone" />
     </template>
 

apps/web/src/oj/submission/composables/rowCursor.ts

@@ -35,6 +35,13 @@ export function useRowCursor(options: {
     const index = navigable.value.findIndex((row) => row.id === selectedId.value)
     return index === -1 ? null : { index: index + 1, count: navigable.value.length }
   })
+  /** 按 ↑ ↓ 会落到的上一条、下一条（本页之内），右栏拿去预取 */
+  const neighbors = computed(() => {
+    const list = navigable.value
+    const index = list.findIndex((row) => row.id === selectedId.value)
+    if (index === -1) return []
+    return [list[index + 1], list[index - 1]].filter((row): row is Row => row !== undefined)
+  })
 
   // 翻页是异步的，先记下「落地后停在哪一头」，新一页回来再选
   let pendingJump: 'first' | 'last' | null = null
@@ -125,5 +132,5 @@ export function useRowCursor(options: {
     move(e.key === 'ArrowUp' ? -1 : 1)
   })
 
-  return { selectedId, selectedRow, position, maxPage, select, move, settleSelection, forgetJump }
+  return { selectedId, selectedRow, position, neighbors, maxPage, select, move, settleSelection, forgetJump }
 }

apps/web/src/oj/submission/detail.vue

@@ -1,8 +1,41 @@
 <script setup lang="ts">
+import { getSubmission } from 'oj/api'
+import { useMascotGuide } from 'shared/mascot/guide'
+import { useUserStore } from 'shared/store/user'
+import type { Submission } from 'utils/types'
 import SubmissionView from './components/SubmissionView.vue'
 
 /** 单独打开的一条提交，主体在 SubmissionView（课堂任务「讲错误」的弹层也用它） */
-defineProps<{ submissionID: string }>()
+const props = defineProps<{ submissionID: string }>()
+
+const router = useRouter()
+const userStore = useUserStore()
+
+/**
+ * 看板娘：学生看自己的提交时带回这道题。SubmissionView 里的数据拿不出来（弹层也用它，不挂看板娘），
+ * 这里另取一份不带「这道题交的几次」的，只给学生取
+ */
+const mine = ref<Submission | null>(null)
+watch(
+  () => [props.submissionID, userStore.isAuthed && !userStore.isTeacherOrAbove] as const,
+  async ([id, student]) => {
+    mine.value = null
+    if (!student) return
+    const res = await getSubmission(id).catch(() => null)
+    if (res && id === props.submissionID && res.userId === userStore.user?.id) mine.value = res
+  },
+  { immediate: true },
+)
+
+useMascotGuide(() => {
+  const s = mine.value
+  if (!s || userStore.isTeacherOrAbove) return null
+  // 和页面上题目那个链接同一个去处：比赛里交的回比赛里的题
+  const to = s.contestId
+    ? { name: 'contest problem', params: { contestID: String(s.contestId), problemID: s.problemDisplayId } }
+    : '/problem/' + s.problemDisplayId
+  return { situation: 'submission.detail', actions: [{ label: '回到这道题', run: () => router.push(to) }] }
+})
 </script>
 
 <template>

apps/web/src/oj/submission/list.vue

@@ -11,6 +11,7 @@ import { useBreakpoints } from 'shared/composables/breakpoints'
 import { usePagination } from 'shared/composables/pagination'
 import { useConfigStore } from 'shared/store/config'
 import { useUserStore } from 'shared/store/user'
+import { useMascotGuide } from 'shared/mascot/guide'
 import { LANGUAGE_SHOW_VALUE, SubmissionStatus } from 'utils/constants'
 import { parseTime } from 'utils/functions'
 import type { FlowchartSubmissionListItem, LANGUAGE, SubmissionListItem } from 'utils/types'
@@ -263,7 +264,7 @@ watch(
 
 // ==================== 选中与翻阅 ====================
 
-const { selectedId, selectedRow, position, maxPage, select, move, settleSelection, forgetJump } = useRowCursor({
+const { selectedId, selectedRow, position, neighbors, maxPage, select, move, settleSelection, forgetJump } = useRowCursor({
   rows,
   total,
   query,
@@ -427,6 +428,18 @@ const { lesson, lessonActive, lessonLoading, toggleLesson } = useLessonFilter({
   info: (text) => message.info(text),
 })
 
+// 看板娘：学生带去看自己的；「这节课」只有老师那一版有，老师给它
+useMascotGuide(() => {
+  if (inContest.value) return null
+  if (!teacher.value) return { situation: 'submissions', actions: mine.value ? [] : [{ label: '只看我的', run: () => (scope.value = 'mine') }] }
+  const toLesson = () => {
+    // 「我的」时这节课的按钮是藏着的，先切回全部
+    if (mine.value) scope.value = 'all'
+    toggleLesson()
+  }
+  return { situation: 'teacher.submissions', actions: lessonActive.value ? [] : [{ label: '这节课', run: toLesson }] }
+})
+
 const activeFilters = computed(
   () =>
     [query.username, query.className, query.result, query.problem].filter(Boolean).length +
@@ -858,6 +871,7 @@ function dayBreak(index: number) {
         <SubmissionPane
           v-else
           :row="selectedRow as SubmissionListItem"
+          :neighbors="neighbors as SubmissionListItem[]"
           :teacher="teacher"
           :class-name="query.className"
           :contest="inContest"
@@ -893,6 +907,7 @@ function dayBreak(index: number) {
         <SubmissionPane
           v-else
           :row="selectedRow as SubmissionListItem"
+          :neighbors="neighbors as SubmissionListItem[]"
           :teacher="teacher"
           :class-name="query.className"
           :contest="inContest"

apps/web/src/oj/task/components/LessonForm.vue

@@ -92,6 +92,9 @@ function openPicker() {
   pickerInitial.value = inputIds().map((id) => ({ id, title: titles.get(id.toLowerCase()) }))
   picking.value = true
 }
+
+// 看板娘气泡里的「选题」：课堂任务页没布置时替老师打开选题弹框
+defineExpose({ openPicker })
 function pickerConfirm(ids: string[]) {
   lessonInput.value = ids.join(' ')
   saveLesson()

apps/web/src/oj/task/index.vue

@@ -10,6 +10,8 @@ import { useLeaveStudents } from 'shared/composables/leaveStudents'
 import { useTeacherHelp } from 'shared/composables/teacherHelp'
 import { useCollabStore } from 'shared/store/collab'
 import { useConfigStore } from 'shared/store/config'
+import { requestSpeech } from 'shared/mascot/behavior'
+import { useMascotGuide, type MascotAction, type MascotGuide } from 'shared/mascot/guide'
 import { errorMessage } from 'utils/api'
 import { LANGUAGE_SHOW_VALUE } from 'utils/constants'
 import { parseTime } from 'utils/functions'
@@ -122,8 +124,11 @@ onUnmounted(pause)
  */
 const editing = ref<false | 'edit' | 'new' | 'carry'>(false)
 
-/** 这节课做什么；推断出来的课为 null（代码交对或流程图画对都算） */
-const mode = computed(() => board.value?.mode ?? null)
+/**
+ * 第几道题今天做什么：今天几节里有这道题的要求合起来（先画流程图一节、再写代码一节 = 先画再写），
+ * 和学生那边的「做完」一致。推断出来的课为 null（代码交对或流程图画对都算）
+ */
+const modeAt = (index: number) => board.value?.problems[index]?.mode ?? null
 
 /**
  * 一个班一天可以上几节内容不同的课。打开任务页（或换到这个班）时，这一节已经布置了这么久，
@@ -200,7 +205,7 @@ function groupOf(student: TaskBoardStudent): Group {
   const cells = student.cells
   if (cells.length && cells.every((cell) => cell.status === 'accepted')) return 'done'
   if (!student.lastSubmitAt) return 'idle'
-  if (cells.some((cell) => isStuck(cell, mode.value))) return 'stuck'
+  if (cells.some((cell, i) => isStuck(cell, modeAt(i)))) return 'stuck'
   return 'working'
 }
 
@@ -327,23 +332,24 @@ function drawKind(cell: TaskBoardCell): ErrorKind {
  * 要画流程图的课，卡在画图上的按最后一张图归堆（drawKind）；先写了代码、没画图的单独一堆
  */
 function wrongOf(index: number): WrongPerson[] {
+  const mode = modeAt(index)
   return present.value.flatMap((student): WrongPerson[] => {
     const cell = student.cells[index]
     if (!cell || cell.status !== 'tried') return []
-    const stage = cellStage(cell, mode.value)
+    const stage = cellStage(cell, mode)
     if (stage === 'draw') {
       const latest = cell.flowchart?.latest
       const evaluated = !!latest && latest.status !== 0 && latest.status !== 1
       return [{ student, cell, kind: drawKind(cell), explain: evaluated ? 'draw' : null }]
     }
     if (stage === 'nodraw') return [{ student, cell, kind: { key: 'nodraw', label: '代码对了，还没画图', line: null }, explain: null }]
-    if (mode.value === 'both' && cell.flowchart?.status === 'accepted' && cell.codeStatus === 'none') {
+    if (mode === 'both' && cell.flowchart?.status === 'accepted' && cell.codeStatus === 'none') {
       return [{ student, cell, kind: { key: 'drawn', label: '图画对了，还没写代码', line: null }, explain: null }]
     }
     // 推断出来的课不分步：今天没代码、却画了流程图的单独一堆
     const kind: ErrorKind = cell.latest
       ? errorKind(cell.latest)
-      : !mode.value && cell.attempts
+      : !mode && cell.attempts
         ? { key: 'flowchart', label: '今天只画了流程图', line: null }
         : { key: 'before', label: '以前交过，今天还没交', line: null }
     return [{ student, cell, kind, explain: cell.latest ? 'code' : null }]
@@ -362,21 +368,18 @@ const problemStats = computed(() =>
     const challenged = problem.hasChallenges ? present.value.filter((student) => student.cells[i]?.challenge === 'done').length : null
     // 先画再写：两步各几人做到，老师一眼看出全班卡在画图还是写代码
     const steps =
-      mode.value === 'both'
+      problem.mode === 'both'
         ? {
             drawn: present.value.filter((student) => student.cells[i]?.flowchart?.status === 'accepted').length,
             coded: present.value.filter((student) => student.cells[i]?.codeStatus === 'accepted').length,
           }
         : null
-    return { problem, done, wrong, none: total - done - wrong, total, challenged, steps }
+    // 先画再写的题，没做完的里面有图画对了、还没写代码的，说「错着」不对 —— 改说「没做完」
+    const wrongWord = problem.mode === 'both' ? '没做完' : '错着'
+    return { problem, done, wrong, none: total - done - wrong, total, challenged, steps, wrongWord }
   }),
 )
 
-/**
- * 先画再写的课，没做完的里面有图画对了、还没写代码的，说「错着」不对 —— 改说「没做完」
- */
-const wrongWord = computed(() => (mode.value === 'both' ? '没做完' : '错着'))
-
 const selectedId = ref<number | null>(null)
 const selectedIndex = computed(() => (board.value?.problems ?? []).findIndex((problem) => problem.problemId === selectedId.value))
 function toggleProblem(problemId: number) {
@@ -408,10 +411,14 @@ const explainShow = ref(false)
 const explainIndex = ref(0)
 const explainProblemIndex = ref(-1)
 const explainProblem = computed(() => board.value?.problems[explainProblemIndex.value] ?? null)
-/** 弹层顶上那排人：这道题错着的人，顺序和错法堆一样 */
-const explainPeople = computed<ExplainPerson[]>(() => {
-  if (explainProblemIndex.value < 0) return []
-  const people = wrongOf(explainProblemIndex.value).filter((person) => person.explain)
+/**
+ * 弹层顶上那排人：这道题错着的人，顺序和错法堆一样。打开那一刻定下来，开着时不跟 15 秒的刷新变：
+ * 弹层记的是第几个人，名单一变（有人改对了、图评完了回到名单里）就成了讲着讲着换了个人
+ */
+const explainPeople = ref<ExplainPerson[]>([])
+function explainPeopleOf(problemIndex: number): ExplainPerson[] {
+  if (problemIndex < 0) return []
+  const people = wrongOf(problemIndex).filter((person) => person.explain)
   const order = new Map<string, number>()
   for (const person of people) {
     order.set(person.kind.key, (order.get(person.kind.key) ?? 0) + 1)
@@ -423,10 +430,11 @@ const explainPeople = computed<ExplainPerson[]>(() => {
         ? { userId: person.student.userId, username: person.student.username, flowchartId: person.cell.flowchart!.latest!.id, label: person.kind.label }
         : { userId: person.student.userId, username: person.student.username, submissionId: person.cell.latest!.submissionId, label: person.kind.label },
     )
-})
+}
 
 function openExplain(problemIndex: number, userId: number) {
   explainProblemIndex.value = problemIndex
+  explainPeople.value = explainPeopleOf(problemIndex)
   explainIndex.value = Math.max(
     0,
     explainPeople.value.findIndex((person) => person.userId === userId),
@@ -442,14 +450,15 @@ const cellColors = computed(() => ({
   actionColor: theme.value.actionColor,
   successColor: theme.value.successColor,
 }))
-const cellStyle = (cell: TaskBoardCell) => cellStyleOf(cell, board.value?.day, cellColors.value, mode.value)
-const cellTitle = (cell: TaskBoardCell, student: TaskBoardStudent) => cellTitleOf(cell, student, board.value?.day, mode.value)
-const cellText = (cell: TaskBoardCell) => cellTextOf(cell, mode.value)
+/** `index`：第几道题，格子按那道题今天做什么来画（modeAt） */
+const cellStyle = (cell: TaskBoardCell, index: number) => cellStyleOf(cell, board.value?.day, cellColors.value, modeAt(index))
+const cellTitle = (cell: TaskBoardCell, student: TaskBoardStudent, index: number) => cellTitleOf(cell, student, board.value?.day, modeAt(index))
+const cellText = (cell: TaskBoardCell, index: number) => cellTextOf(cell, modeAt(index))
 
 /** 点了能讲的格子：没做完，卡着的那一步有评完的图或今天的代码 */
-function explainable(cell: TaskBoardCell) {
+function explainable(cell: TaskBoardCell, index: number) {
   if (cell.status !== 'tried') return false
-  const stage = cellStage(cell, mode.value)
+  const stage = cellStage(cell, modeAt(index))
   if (stage === 'draw') {
     const latest = cell.flowchart?.latest
     return !!latest && latest.status !== 0 && latest.status !== 1
@@ -490,7 +499,7 @@ function submissionsHref(
   // SQL 题不受布置的语言限制，格子数的是 SQL 交的
   const language = problem?.isSql ? 'SQL' : board.value?.language
   // 只画流程图的课，格子数的全是流程图
-  const flowSide = flowchart || mode.value === 'flowchart'
+  const flowSide = flowchart || problem?.mode === 'flowchart'
   return router.resolve({
     name: 'submissions',
     query: {
@@ -504,6 +513,161 @@ function submissionsHref(
   }).href
 }
 
+/**
+ * 看板娘：布置了就带去这节课的提交，筛法同提交列表「这节课」（班、这几道题、今天）。
+ * 语言和格子一致：画流程图的课看流程图，选了语言的只看它 —— 夹着 SQL 题的不筛语言，免得把 SQL 交的藏掉。
+ * 还没布置时填题号的框就是这页最大的东西，不给按钮
+ */
+const startForm = useTemplateRef<{ openPicker: () => void }>('startForm')
+// ---------- 看板娘：点她时挑全班这一刻最要紧的一件说；卡住的多起来、全班做完时她自己开口 ----------
+
+/** 同一种错有这么多人才算「扎堆」 */
+const PILE_MIN = 3
+/** 布置这么久了，人在线却一道没交，才算「没动」 */
+const IDLE_AFTER_MS = 10 * 60_000
+/** 一道题卡住的人涨到这么多，她主动说一声 */
+const STUCK_RISE = 3
+
+/** 人最多的那一堆错（灰底那几堆不算：不是今天的错，没得讲） */
+function biggestPile() {
+  let best: { index: number; kind: ErrorKind; people: WrongPerson[] } | null = null
+  const count = board.value?.problems.length ?? 0
+  for (let index = 0; index < count; index++) {
+    const groups = new Map<string, WrongPerson[]>()
+    for (const person of wrongOf(index)) {
+      if (QUIET_KINDS.has(person.kind.key)) continue
+      groups.set(person.kind.key, [...(groups.get(person.kind.key) ?? []), person])
+    }
+    for (const people of groups.values()) {
+      if (!best || people.length > best.people.length) best = { index, kind: people[0]!.kind, people }
+    }
+  }
+  return best && best.people.length >= PILE_MIN ? best : null
+}
+
+/** 卡住的人（cells.ts 的 isStuck），交得多的在前 */
+function stuckPeople() {
+  return present.value
+    .flatMap((student) => student.cells.map((cell, index) => ({ student, cell, index })))
+    .filter(({ cell, index }) => isStuck(cell, modeAt(index)))
+    .sort((a, b) => b.cell.attempts - a.cell.attempts)
+}
+
+/** 在线、今天一道没交、也不是早就全做完了的人 */
+function idlePeople() {
+  const assignedAt = board.value?.assignedAt
+  if (!assignedAt || Date.now() - Date.parse(assignedAt) < IDLE_AFTER_MS) return []
+  return present.value.filter(
+    (student) => student.online && student.cells.every((cell) => cell.attempts === 0) && student.cells.some((cell) => cell.status !== 'accepted'),
+  )
+}
+
+const allDone = () => present.value.length > 0 && present.value.every((student) => student.cells.every((cell) => cell.status === 'accepted'))
+
+/** 点名字：能讲的打开讲错误的弹层，不能讲的展开那道题的错法 */
+function lookAt(index: number, student: TaskBoardStudent): MascotAction {
+  const cell = student.cells[index]!
+  const problem = board.value!.problems[index]!
+  return {
+    label: `看 ${displayName(student.username)} 的`,
+    run: () => (explainable(cell, index) ? openExplain(index, student.userId) : (selectedId.value = problem.problemId)),
+  }
+}
+
+useMascotGuide((): MascotGuide | null => {
+  const b = board.value
+  if (!b?.className) return null
+  if (needLesson.value)
+    return { situation: 'teacher.task.unassigned', actions: startForm.value ? [{ label: '选题', run: () => startForm.value?.openPicker() }] : [] }
+  const language = b.mode === 'flowchart' ? 'Flowchart' : b.problems.some((problem) => problem.isSql) ? null : b.language
+  const query = {
+    className: b.className,
+    problem: b.problems.map((problem) => problem.problemDisplayId).join(','),
+    today: '1',
+    ...(language ? { language } : {}),
+  }
+  // 新标签打开，和点格子一样：任务页一般开着不关
+  const submissions: MascotAction = { label: '这节课的提交', run: () => window.open(router.resolve({ name: 'submissions', query }).href, '_blank') }
+
+  if (allDone())
+    return { situation: 'teacher.task.allDone', actions: [{ label: b.source === 'teacher' ? '改题' : '布置', run: () => (editing.value = 'edit') }] }
+
+  const pile = biggestPile()
+  if (pile) {
+    const problem = b.problems[pile.index]!
+    const first = pile.people.find((person) => person.explain)
+    const actions: MascotAction[] = [{ label: '看这堆', run: () => (selectedId.value = problem.problemId) }]
+    if (first) actions.push({ label: '讲第一个', run: () => openExplain(pile.index, first.student.userId) })
+    return {
+      situation: 'teacher.task.errorPile',
+      n: pile.people.length,
+      vars: { pid: problem.problemDisplayId, kind: pile.kind.label },
+      actions: [...actions, submissions],
+    }
+  }
+
+  const stuck = stuckPeople()
+  if (stuck.length) {
+    const top = stuck[0]!
+    return {
+      situation: 'teacher.task.stuck',
+      n: new Set(stuck.map((it) => it.student.userId)).size,
+      vars: { name: displayName(top.student.username), k: top.cell.attempts, pid: b.problems[top.index]!.problemDisplayId },
+      actions: [lookAt(top.index, top.student), submissions],
+    }
+  }
+
+  const idle = idlePeople()
+  if (idle.length) {
+    const name = displayName(idle[0]!.username)
+    return idle.length === 1 ? { situation: 'teacher.task.idleOne', vars: { name } } : { situation: 'teacher.task.idle', n: idle.length, vars: { name } }
+  }
+
+  const challenging = present.value.filter((student) => student.cells.some((cell) => cell.challenge === 'doing')).length
+  if (challenging) return { situation: 'teacher.task.challenging', n: challenging, actions: [submissions] }
+
+  return { situation: 'teacher.task.assigned', actions: [submissions] }
+})
+
+/**
+ * 主动开口：每 15 秒刷新一次，和上一次比 —— 某道题卡住的人从不到 3 个涨到 3 个、全班刚做完。
+ * 刚打开页面（或换了班、换了一节）的那一次只记数不说，不然一刷新就把已经知道的事再说一遍
+ */
+let seen: { key: string; stuck: Map<number, number>; done: boolean } | null = null
+watch(board, (b) => {
+  if (!b?.className || needLesson.value) return
+  const key = `${b.className}|${b.day}|${b.lessonId ?? ''}|${b.problems.map((problem) => problem.problemId).join(',')}`
+  const stuck = new Map<number, number>()
+  for (const { index } of stuckPeople()) {
+    const id = b.problems[index]!.problemId
+    stuck.set(id, (stuck.get(id) ?? 0) + 1)
+  }
+  const done = allDone()
+  const before = seen?.key === key ? seen : null
+  seen = { key, stuck, done }
+  if (!before) return
+  if (done && !before.done) {
+    requestSpeech({
+      key: `done:${key}`,
+      situation: 'teacher.task.allDone',
+      actions: [{ label: b.source === 'teacher' ? '改题' : '布置', run: () => (editing.value = 'edit') }],
+    })
+    return
+  }
+  for (const [id, n] of stuck) {
+    if (n < STUCK_RISE || (before.stuck.get(id) ?? 0) >= STUCK_RISE) continue
+    const problem = b.problems.find((it) => it.problemId === id)!
+    requestSpeech({
+      key: `stuck:${key}:${id}`,
+      situation: 'teacher.task.stuckRise',
+      n,
+      vars: { pid: problem.problemDisplayId },
+      actions: [{ label: '看这道', run: () => (selectedId.value = id) }],
+    })
+    return
+  }
+})
+
 function lastText(student: TaskBoardStudent) {
   if (student.lastSubmitAt) return parseTime(student.lastSubmitAt, 'HH:mm')
   if (oftenIdle(student)) {
@@ -532,7 +696,8 @@ function lastText(student: TaskBoardStudent) {
       />
       <div v-else-if="board?.problems.length && !needLesson" class="lesson">
         <span class="lesson-label">{{ board.source === 'teacher' ? '这节课' : '今天在做' }}</span>
-        <span v-if="board.mode && board.mode !== 'code'" class="chip lang">{{ LESSON_MODE_LABEL[board.mode] }}</span>
+        <!-- 写代码也写出来：只写「Python」的话，看不出这节是写代码还是先画再写 -->
+        <span v-if="board.mode" class="chip lang">{{ LESSON_MODE_LABEL[board.mode] }}</span>
         <span v-if="board.language" class="chip lang">{{ LANGUAGE_SHOW_VALUE[board.language] }}</span>
         <span v-for="problem in board.problems" :key="problem.problemId" class="chip">
           {{ problem.problemDisplayId }}
@@ -570,7 +735,16 @@ function lastText(student: TaskBoardStudent) {
       <!-- 刚上课还没有题：填题号的框是这页最大的东西 -->
       <section v-if="needLesson" class="start">
         <div class="start-title">这节课做哪几道题？</div>
-        <LessonForm v-if="className" :board="board" :class-name="className" :lesson-id="null" variant="start" class="start-row" @saved="lessonSaved" />
+        <LessonForm
+          v-if="className"
+          ref="startForm"
+          :board="board"
+          :class-name="className"
+          :lesson-id="null"
+          variant="start"
+          class="start-row"
+          @saved="lessonSaved"
+        />
         <div v-if="staleLesson" class="earlier">
           <span>上一节 {{ board.assignedAt ? parseTime(board.assignedAt, 'HH:mm') : '' }} {{ board.assignedBy }} 布置</span>
           <span v-for="problem in board.problems" :key="problem.problemId" class="chip">{{ problem.problemDisplayId }}</span>
@@ -601,7 +775,7 @@ function lastText(student: TaskBoardStudent) {
             </span>
             <span v-if="stat.steps" class="card-steps">画对 {{ stat.steps.drawn }} · 写对 {{ stat.steps.coded }}</span>
             <span class="card-foot">
-              <span :class="stat.wrong ? 'wrong' : 'muted'">{{ wrongWord }} {{ stat.wrong }}</span>
+              <span :class="stat.wrong ? 'wrong' : 'muted'">{{ stat.wrongWord }} {{ stat.wrong }}</span>
               <span class="muted">没做 {{ stat.none }}</span>
               <span v-if="stat.challenged !== null" class="challenged"> 挑战成功 {{ stat.challenged }} </span>
             </span>
@@ -624,7 +798,7 @@ function lastText(student: TaskBoardStudent) {
               {{ board.problems[selectedIndex]!.title }}
             </a>
             <span>
-              {{ wrongWord }}的 <b class="wrong">{{ problemStats[selectedIndex]!.wrong }}</b> 人
+              {{ problemStats[selectedIndex]!.wrongWord }}的 <b class="wrong">{{ problemStats[selectedIndex]!.wrong }}</b> 人
             </span>
             <span class="muted">没做 {{ problemStats[selectedIndex]!.none }} 人</span>
             <div class="spacer"></div>
@@ -643,7 +817,7 @@ function lastText(student: TaskBoardStudent) {
                 <template v-for="person in group.people" :key="person.student.userId">
                   <button v-if="person.explain" type="button" class="who" @click="openExplain(selectedIndex, person.student.userId)">
                     <UserName :username="person.student.username" />
-                    <span class="mini" :style="cellStyle(person.cell)">{{ cellText(person.cell) }}</span>
+                    <span class="mini" :style="cellStyle(person.cell, selectedIndex)">{{ cellText(person.cell, selectedIndex) }}</span>
                   </button>
                   <!-- 没有今天的代码可讲：去提交列表看他交过的 -->
                   <a
@@ -747,15 +921,15 @@ function lastText(student: TaskBoardStudent) {
                 </td>
                 <td v-for="(cell, i) in student.cells" :key="i" :class="{ hl: i === selectedIndex }">
                   <button
-                    v-if="explainable(cell)"
+                    v-if="explainable(cell, i)"
                     type="button"
                     class="cell"
                     :data-challenge="cell.challenge ?? undefined"
-                    :style="cellStyle(cell)"
-                    :title="cellTitle(cell, student)"
+                    :style="cellStyle(cell, i)"
+                    :title="cellTitle(cell, student, i)"
                     @click="openExplain(i, student.userId)"
                   >
-                    {{ cellText(cell) }}
+                    {{ cellText(cell, i) }}
                   </button>
                   <n-popover
                     v-else-if="cell.trail.length"
@@ -771,11 +945,11 @@ function lastText(student: TaskBoardStudent) {
                         class="cell"
                         :data-challenge="cell.challenge ?? undefined"
                         :class="{ picked: trailKey === `${student.userId}:${i}` }"
-                        :style="cellStyle(cell)"
-                        :title="cellTitle(cell, student)"
+                        :style="cellStyle(cell, i)"
+                        :title="cellTitle(cell, student, i)"
                         @click="toggleTrail(`${student.userId}:${i}`)"
                       >
-                        {{ cellText(cell) }}
+                        {{ cellText(cell, i) }}
                       </button>
                     </template>
                     <TrailPanel
@@ -791,15 +965,15 @@ function lastText(student: TaskBoardStudent) {
                     v-else-if="cell.attempts"
                     class="cell"
                     :data-challenge="cell.challenge ?? undefined"
-                    :style="cellStyle(cell)"
+                    :style="cellStyle(cell, i)"
                     :href="submissionsHref(student, board.problems[i], !cell.codeAttempts)"
                     target="_blank"
-                    :title="cellTitle(cell, student)"
+                    :title="cellTitle(cell, student, i)"
                   >
-                    {{ cellText(cell) }}
+                    {{ cellText(cell, i) }}
                   </a>
-                  <span v-else class="cell" :data-challenge="cell.challenge ?? undefined" :style="cellStyle(cell)" :title="cellTitle(cell, student)">
-                    {{ cellText(cell) }}
+                  <span v-else class="cell" :data-challenge="cell.challenge ?? undefined" :style="cellStyle(cell, i)" :title="cellTitle(cell, student, i)">
+                    {{ cellText(cell, i) }}
                   </span>
                 </td>
                 <td class="num">{{ doneCount(student) }}/{{ board.problems.length }}</td>

apps/web/src/oj/user/index.vue

@@ -4,6 +4,7 @@ import { getProfileOverview } from 'oj/api'
 import { getProfile } from 'shared/api'
 import { useBreakpoints } from 'shared/composables/breakpoints'
 import { useUserStore } from 'shared/store/user'
+import { goAction, useMascotGuide } from 'shared/mascot/guide'
 import type { Profile } from 'utils/types'
 import AchievementCard from './components/AchievementCard.vue'
 import KnowledgeMap from './components/KnowledgeMap.vue'
@@ -17,6 +18,7 @@ import VersusCard from './components/VersusCard.vue'
  * /profiles/:username/overview），这里只管摆。原来的「我的设置」并进了名片。
  */
 const route = useRoute()
+const router = useRouter()
 const userStore = useUserStore()
 const { isDesktop } = useBreakpoints()
 
@@ -47,6 +49,12 @@ async function load() {
 }
 
 watch(username, load, { immediate: true })
+
+// 看板娘：只在看自己的主页时说话
+useMascotGuide(() => {
+  if (!isSelf.value || !profile.value || userStore.isTeacherOrAbove) return null
+  return { situation: 'profile', actions: [goAction(router, '我的成就', '/achievement'), goAction(router, '我的提交', '/submission?myself=1')] }
+})
 </script>
 
 <template>

apps/web/src/shared/assets/mascot/LICENSE

@@ -0,0 +1,21 @@
+MIT License
+
+Copyright (c) 2026 Sutera-Diffusus
+
+Permission is hereby granted, free of charge, to any person obtaining a copy
+of this software and associated documentation files (the "Software"), to deal
+in the Software without restriction, including without limitation the rights
+to use, copy, modify, merge, publish, distribute, sublicense, and/or sell
+copies of the Software, and to permit persons to whom the Software is
+furnished to do so, subject to the following conditions:
+
+The above copyright notice and this permission notice shall be included in all
+copies or substantial portions of the Software.
+
+THE SOFTWARE IS PROVIDED "AS IS", WITHOUT WARRANTY OF ANY KIND, EXPRESS OR
+IMPLIED, INCLUDING BUT NOT LIMITED TO THE WARRANTIES OF MERCHANTABILITY,
+FITNESS FOR A PARTICULAR PURPOSE AND NONINFRINGEMENT. IN NO EVENT SHALL THE
+AUTHORS OR COPYRIGHT HOLDERS BE LIABLE FOR ANY CLAIM, DAMAGES OR OTHER
+LIABILITY, WHETHER IN AN ACTION OF CONTRACT, TORT OR OTHERWISE, ARISING FROM,
+OUT OF OR IN CONNECTION WITH THE SOFTWARE OR THE USE OR OTHER DEALINGS IN THE
+SOFTWARE.