diff --git a/apps/web/src/shared/components/CollabHost.vue b/apps/web/src/shared/components/CollabHost.vue
index 257b308..6a4006c 100644
--- a/apps/web/src/shared/components/CollabHost.vue
+++ b/apps/web/src/shared/components/CollabHost.vue
@@ -1,20 +1,23 @@
 <script setup lang="ts">
-import type { CollabRequestItem } from "shared/composables/websocket"
 import { useCollabStore } from "shared/store/collab"
 import HelpRequestList from "./HelpRequestList.vue"
 
 /**
- * 课堂求助的全局界面：一次性提示、新求助 toast、求助列表。
+ * 课堂求助的全局界面：一次性提示、求助列表。
+ *
+ * 新求助**不弹 toast**：原来每来一个就弹一条，一节课能弹十几次，讲台电脑投着屏时还弹在
+ * 全班面前。现在靠顶栏（前台、后台都有）的 HelpButton：没人等不显示，冒出来就是提醒，
+ * 人数再变多时闪一下。
  *
  * 教师端的协作**没有弹框**：接单会跳到那道题的页面，在页面自带的编辑器里协作
  * （见 HelpRequestList 的 handleAccept、ProblemEditor 的 collabHere）。
  * 原来这里还异步挂一个 CollabModal，那个弹框按一下 Esc 就关、协作跟着结束。
  *
  * 挂在 App.vue 而不是顶栏或 default.vue 布局里。这些东西跟着**连接**走，
- * 而连接是全局常驻的（App.vue 按登录态开关）—— 挂在顶栏里的时候，老师一进
- * /admin 就换成了 admin.vue 布局，顶栏连同这几个消费者一起卸载：求助照收，
- * 提示、角标、协作界面全都不出现，正好错过 collab.ts 里写的那句「老师可能
- * 正在后台改题时收到求助」。放在这里才真的全局。
+ * 而连接是全局常驻的（App.vue 按登录态开关）—— 挂在前台顶栏里的时候，老师一进
+ * /admin 就换成了 admin.vue 布局，顶栏连同这几个消费者一起卸载，正好错过
+ * collab.ts 里写的那句「老师可能正在后台改题时收到求助」。放在这里才真的全局；
+ * 后台那条顶栏自己也挂了一个 HelpButton。
  *
  * 位置要求：n-message-provider 的后代（useMessage 需要）。
  */
@@ -35,43 +38,6 @@ watch(
     if (text) message.info(text)
   },
 )
-
-/**
- * 新求助进来只有角标默默 +1，上课走动的时候根本注意不到，补一条 toast。
- *
- * 只在数字**变大**时弹：老师自己接单、拒绝、别的老师接走都会让它变小，那些
- * 不该打扰人。断线重连后服务端会重推一份全量列表，队里还有人的话这里会再弹
- * 一次 —— 那正好是「你刚断过线，这些人还等着」，留着。
- */
-watch(
-  () => collabStore.pendingCount,
-  (count, previous) => {
-    if (count <= previous) return
-    let latest: CollabRequestItem | null = null
-    for (const item of collabStore.requests) {
-      if (item.status !== "pending") continue
-      if (!latest || item.createdAt > latest.createdAt) latest = item
-    }
-    const text = latest ? `${latest.studentName} 求助：${latest.problemTitle}` : "有新的求助"
-    // 内容传 render 函数（naive 的 content 支持），这样整条 toast 可点：
-    // 点一下直接开求助列表，省得再去点名字、再点菜单。
-    const notice = message.info(
-      () =>
-        h(
-          "span",
-          {
-            style: { cursor: "pointer" },
-            onClick: () => {
-              collabStore.helpPanelOpen = true
-              notice.destroy()
-            },
-          },
-          `${text} · 点击处理`,
-        ),
-      { duration: 5000 },
-    )
-  },
-)
 </script>
 
 <template>
diff --git a/apps/web/src/shared/components/Header.vue b/apps/web/src/shared/components/Header.vue
index d503046..6480eb0 100644
--- a/apps/web/src/shared/components/Header.vue
+++ b/apps/web/src/shared/components/Header.vue
@@ -1,15 +1,16 @@
 <script setup lang="ts">
 import { Icon } from "@iconify/vue"
+import { NSwitch, useThemeVars } from "naive-ui"
 import { RouterLink } from "vue-router"
 import { useBreakpoints } from "shared/composables/breakpoints"
 import { useDarkTransition } from "shared/composables/darkTransition"
 import { useLearnProgress } from "shared/composables/learnProgress"
-import { useProblemJump } from "shared/composables/problemJump"
 import { useAuthModalStore } from "shared/store/authModal"
 import { useCollabStore } from "shared/store/collab"
 import { useConfigStore } from "../store/config"
 import { useUserStore } from "../store/user"
-import { useThemeVars } from "naive-ui"
+import HelpButton from "./HelpButton.vue"
+import ProblemJumpBox from "./ProblemJumpBox.vue"
 
 const userStore = useUserStore()
 const configStore = useConfigStore()
@@ -24,23 +25,17 @@ const { isDark, toggleDark } = useDarkTransition()
 const theme = useThemeVars()
 
 /**
- * 求助的入口收进姓名下拉里，顶栏只留姓名按钮上的角标 —— 老师不用展开菜单
- * 也能看见有没有人举手。窄屏同样给：接单之后要在弹框里替学生写代码，那件事
- * 确实只有桌面端好使，但「有没有人在等」是宽度多少都得知道的。
+ * 1280 以下（老师的笔记本）收一收：题号框变窄、「课堂看板」只留图标。
+ * 机房的两种屏是 1280 和 1366，都走完整那版 —— 老师也会用机房的电脑。
  */
-const pendingHelpCount = computed(() => (collabStore.isTeacher ? collabStore.pendingCount : 0))
+const compact = useMediaQuery("(max-width: 1279px)")
+// 再窄（769–1023，很少见）一行放不下老师那版，允许折行，只保证不坏
+const narrow = useMediaQuery("(max-width: 1023px)")
 
-/**
- * 顶栏的题号框：老师报完题号，学生在哪一页都能直接敲，不用先回首页或题目列表。
- * 只给桌面端 —— 窄屏顶栏已经挤满了，手机上从首页的搜索框走同一套逻辑。
- */
-const { jump, jumping } = useProblemJump()
-const jumpKeyword = ref("")
-
-async function handleJump() {
-  await jump(jumpKeyword.value)
-  jumpKeyword.value = ""
-}
+const tone = computed(() => ({
+  activeBg: isDark.value ? "rgba(99, 226, 183, 0.14)" : "#e7f5ed",
+  activeText: isDark.value ? theme.value.primaryColor : theme.value.primaryColorPressed,
+}))
 
 /**
  * 站名后面的小标签：环境名、演示中。
@@ -79,7 +74,7 @@ function handleToggleDemoMode() {
 }
 
 function renderIcon(icon: string) {
-  return () => h(Icon, { icon, width: 20 })
+  return () => h(Icon, { icon, width: 18 })
 }
 
 function learnLink(type: "python" | "c") {
@@ -87,154 +82,161 @@ function learnLink(type: "python" | "c") {
 }
 
 /**
- * 顶栏导航的唯一一张表：桌面端渲染成一排纯文字链接，窄屏收进「菜单」下拉。
+ * 顶栏导航的唯一一张表：桌面端渲染成一排纯文字，窄屏收进「菜单」下拉。
  * `key` 就是一级路径，用来判定高亮（见上面的 active）。
  *
- * 桌面端不带图标、不用 n-menu：n-menu 横排每项固定占 100px，管理员 8 项在
- * 1280 宽的机房屏上直接把顶栏挤成两行。图标只留给下拉菜单。
+ * 一级只放天天用的（题目、题单）和课上会被点名去看的（比赛、排名）。提交、公告收进
+ * 「更多」：全站的提交列表学生很少翻，自己的在个人菜单里；公告一年没几条。
+ * 不用 n-menu：它横排每项固定占 100px，1280 宽的机房屏上会把顶栏挤成两行。
  */
 interface NavLink {
   key: string
   label: string
   to: string
-  icon: string
   show?: boolean
 }
 
-const navLinks = computed<NavLink[]>(() =>
+const navLinks: NavLink[] = [
+  { key: "problem", label: "题目", to: "/problem" },
+  { key: "problemset", label: "题单", to: "/problemset" },
+  { key: "contest", label: "比赛", to: "/contest" },
+  { key: "rank", label: "排名", to: "/rank" },
+]
+
+const moreLinks = computed<NavLink[]>(() =>
   [
-    { key: "problem", label: "题目", to: "/problem", icon: "fluent-emoji:memo" },
-    { key: "problemset", label: "题单", to: "/problemset", icon: "fluent-emoji:clipboard" },
-    {
-      key: "submission",
-      label: "提交",
-      to: "/submission",
-      icon: "fluent-emoji:inbox-tray",
-      show: userStore.showSubmissions,
-    },
-    { key: "contest", label: "比赛", to: "/contest", icon: "fluent-emoji:chequered-flag" },
-    { key: "rank", label: "排名", to: "/rank", icon: "fluent-emoji:trophy" },
-    { key: "announcement", label: "公告", to: "/announcement", icon: "fluent-emoji:loudspeaker" },
+    { key: "submission", label: "提交", to: "/submission", show: userStore.showSubmissions },
+    { key: "announcement", label: "公告", to: "/announcement" },
   ].filter((link) => link.show !== false),
 )
 
+const moreActive = computed(() => moreLinks.value.some((link) => link.key === active.value))
+
 const learnOptions: DropdownOption[] = [
-  { label: "Python", key: "learn-python" },
-  { label: "C语言", key: "learn-c" },
+  { label: "Python", key: "learn-python", icon: renderIcon("ph:book-open") },
+  { label: "C 语言", key: "learn-c", icon: renderIcon("ph:book-open") },
 ]
 
-// 「后台」不和学生导航排在一起：桌面端放到右边那组的开头、弱化成灰字，
-// 老师和学生看到的顶栏前半截就是同一排
-const adminPath = computed(() => (userStore.isSuperAdmin ? "/admin" : "/admin/problem/list"))
-
-const mobileMenus = computed<DropdownOption[]>(() => [
-  {
-    label: "自学",
-    key: "learn",
-    icon: renderIcon("fluent-emoji:books"),
-    children: learnOptions,
-  },
-  ...navLinks.value.map((link) => ({
+const moreOptions = computed<DropdownOption[]>(() =>
+  moreLinks.value.map((link) => ({
     label: link.label,
     key: link.key,
-    icon: renderIcon(link.icon),
+    icon: renderIcon(link.key === "submission" ? "ph:tray" : "ph:megaphone"),
   })),
-  {
-    label: "后台",
-    key: "admin",
-    icon: renderIcon("fluent-emoji:gear"),
-    show: userStore.isAdminRole,
-  },
+)
+
+const mobileMenus = computed<DropdownOption[]>(() => [
+  ...navLinks.map((link) => ({ label: link.label, key: link.key })),
+  { label: "自学", key: "learn", children: learnOptions },
+  ...moreLinks.value.map((link) => ({ label: link.label, key: link.key })),
 ])
 
 function handleNavSelect(key: string) {
   if (key === "learn-python") router.push(learnLink("python"))
   else if (key === "learn-c") router.push(learnLink("c"))
-  else if (key === "admin") router.push(adminPath.value)
   else {
-    const link = navLinks.value.find((item) => item.key === key)
+    const link = [...navLinks, ...moreLinks.value].find((item) => item.key === key)
     if (link) router.push(link.to)
   }
 }
 
-const options = computed<Array<DropdownOption | DropdownDividerOption>>(() => [
-  {
-    label: pendingHelpCount.value ? `课堂求助（${pendingHelpCount.value}）` : "课堂求助",
-    key: "help",
-    show: collabStore.isTeacher,
-    icon: renderIcon("streamline-emojis:raising-hands-2"),
-    props: {
-      onClick: () => (collabStore.helpPanelOpen = true),
+const adminPath = computed(() => (userStore.isSuperAdmin ? "/admin" : "/admin/problem/list"))
+
+/**
+ * 暗色开关放进个人菜单：顶栏右边留给老师的课堂工具。整行可点，开关只是显示状态
+ * （pointer-events 关掉，免得点在开关上切两次）。
+ */
+function renderThemeRow() {
+  return h(
+    "div",
+    {
+      class: "theme-row",
+      role: "switch",
+      "aria-checked": isDark.value,
+      tabindex: 0,
+      onClick: toggleDark,
+      onKeydown: (event: KeyboardEvent) => {
+        if (event.key === "Enter" || event.key === " ") {
+          event.preventDefault()
+          ;(event.currentTarget as HTMLElement).click()
+        }
+      },
     },
-  },
-  {
-    label: "课堂看板",
-    key: "classroom-board",
-    show: userStore.isTeacherOrAbove,
-    icon: renderIcon("fluent-emoji:school"),
-    props: {
-      onClick: () => router.push("/classroom"),
+    [
+      h(Icon, { icon: "ph:moon", width: 18 }),
+      h("span", { class: "theme-label" }, "暗色"),
+      h(NSwitch, { value: isDark.value, size: "small", style: "pointer-events: none" }),
+    ],
+  )
+}
+
+/**
+ * 个人菜单只放「自己的东西」+ 后台入口 + 暗色开关。
+ * 课堂求助、课堂看板挪到了顶栏上（HelpButton、下面的课堂看板链接），不在这里。
+ */
+const options = computed<Array<DropdownOption | DropdownDividerOption>>(() => {
+  const work = userStore.isAdminRole || userStore.canToggleDemoMode
+  return [
+    {
+      label: "后台",
+      key: "admin",
+      show: userStore.isAdminRole,
+      icon: renderIcon("ph:toolbox"),
+      props: { onClick: () => router.push(adminPath.value) },
     },
-  },
-  {
-    label: "我的主页",
-    key: "home",
-    icon: renderIcon("streamline-ultimate-color:newspaper-fold"),
-    props: {
-      onClick: () => router.push("/user"),
+    {
+      label: userStore.demoMode ? "退出演示" : "进入演示",
+      key: "demo-mode",
+      show: userStore.canToggleDemoMode,
+      icon: renderIcon("ph:presentation"),
+      props: { onClick: handleToggleDemoMode },
     },
-  },
-  {
-    label: "我的成就",
-    key: "achievement",
-    icon: renderIcon("streamline-ultimate-color:award-medal-4"),
-    props: {
-      onClick: () => router.push("/achievement"),
+    { type: "divider", key: "work-divider", show: work },
+    {
+      label: "我的主页",
+      key: "home",
+      icon: renderIcon("ph:house"),
+      props: { onClick: () => router.push("/user") },
     },
-  },
-  {
-    label: "我的提交",
-    key: "status",
-    icon: renderIcon("streamline-ultimate-color:analytics-bars-3d"),
-    props: {
-      onClick: () => router.push("/submission?myself=1"),
+    {
+      label: "我的成就",
+      key: "achievement",
+      icon: renderIcon("ph:medal"),
+      props: { onClick: () => router.push("/achievement") },
     },
-  },
-  {
-    label: "我的设置",
-    key: "setting",
-    icon: renderIcon("streamline-emojis:musical-score"),
-    props: {
-      onClick: () => router.push("/setting"),
+    {
+      label: "我的提交",
+      key: "status",
+      icon: renderIcon("ph:list-checks"),
+      props: { onClick: () => router.push("/submission?myself=1") },
     },
-  },
-  {
-    label: "智能分析",
-    key: "ai-analysis",
-    icon: renderIcon("vscode-icons:file-type-gemini"),
-    props: {
-      onClick: () => router.push("/ai-analysis"),
+    {
+      label: "智能分析",
+      key: "ai-analysis",
+      icon: renderIcon("ph:sparkle"),
+      props: { onClick: () => router.push("/ai-analysis") },
     },
-  },
-  {
-    label: userStore.demoMode ? "退出演示" : "进入演示",
-    key: "demo-mode",
-    show: userStore.canToggleDemoMode,
-    icon: renderIcon("fluent-emoji:graduation-cap"),
-    props: { onClick: handleToggleDemoMode },
-  },
-  { type: "divider" },
-  {
-    label: "退出",
-    key: "logout",
-    icon: renderIcon("streamline-ultimate-color:coffee-cold"),
-    props: { onClick: handleLogout },
-  },
-])
+    {
+      label: "我的设置",
+      key: "setting",
+      icon: renderIcon("ph:gear-six"),
+      props: { onClick: () => router.push("/setting") },
+    },
+    { type: "divider", key: "theme-divider" },
+    { type: "render", key: "theme", render: renderThemeRow },
+    { type: "divider", key: "logout-divider" },
+    {
+      label: "退出",
+      key: "logout",
+      icon: renderIcon("ph:sign-out"),
+      props: { onClick: handleLogout },
+    },
+  ]
+})
 </script>
 
 <template>
-  <header class="bar" :class="{ mobile: isMobile }">
+  <header class="bar" :class="{ compact, wrap: isMobile || narrow }">
     <RouterLink to="/" class="brand">
       <Icon icon="streamline-emojis:dog" :height="26"></Icon>
       <span>{{ configStore.config?.websiteName }}</span>
@@ -244,9 +246,6 @@ const options = computed<Array<DropdownOption | DropdownDividerOption>>(() => [
       </n-tag>
     </RouterLink>
     <nav v-if="isDesktop" class="nav">
-      <n-dropdown trigger="hover" :options="learnOptions" @select="handleNavSelect">
-        <button type="button" class="nav-link" :class="{ active: active === 'learn' }">自学</button>
-      </n-dropdown>
       <RouterLink
         v-for="link in navLinks"
         :key="link.key"
@@ -256,36 +255,42 @@ const options = computed<Array<DropdownOption | DropdownDividerOption>>(() => [
       >
         {{ link.label }}
       </RouterLink>
+      <n-dropdown trigger="hover" :options="learnOptions" @select="handleNavSelect">
+        <button type="button" class="nav-link" :class="{ active: active === 'learn' }">
+          自学<Icon icon="ph:caret-down-bold" :width="11" />
+        </button>
+      </n-dropdown>
+      <n-dropdown trigger="hover" :options="moreOptions" @select="handleNavSelect">
+        <button type="button" class="nav-link" :class="{ active: moreActive }">
+          更多<Icon icon="ph:caret-down-bold" :width="11" />
+        </button>
+      </n-dropdown>
     </nav>
     <div class="spacer"></div>
     <div class="actions">
-      <template v-if="isDesktop && userStore.isAdminRole">
-        <RouterLink :to="adminPath" class="admin-link">
-          <Icon icon="ph:gear-six" :width="15" />
-          <span>后台</span>
+      <ProblemJumpBox v-if="isDesktop" :compact="compact" />
+      <template v-if="isDesktop && collabStore.isTeacher">
+        <RouterLink
+          to="/classroom"
+          class="tool-link"
+          :class="{ active: active === 'classroom' }"
+          title="课堂看板"
+          aria-label="课堂看板"
+        >
+          <Icon icon="ph:monitor" :width="16" />
+          <span v-if="!compact">课堂看板</span>
         </RouterLink>
         <span class="divider"></span>
       </template>
       <n-dropdown v-if="isMobile" :options="mobileMenus" size="large" @select="handleNavSelect">
         <n-button>菜单</n-button>
       </n-dropdown>
-      <n-input
-        v-if="isDesktop"
-        v-model:value="jumpKeyword"
-        class="jump"
-        placeholder="输入题号直达"
-        :loading="jumping"
-        @keyup.enter="handleJump"
-      >
-        <template #prefix>
-          <Icon icon="ph:magnifying-glass" />
-        </template>
-      </n-input>
       <template v-if="userStore.isFinished">
         <n-dropdown v-if="userStore.isAuthed" :options="options" size="large">
-          <n-badge :value="pendingHelpCount" :max="99">
-            <n-button>{{ userStore.user!.username }}</n-button>
-          </n-badge>
+          <n-button class="name" :title="userStore.user!.username">
+            <span class="name-text">{{ userStore.user!.username }}</span>
+            <Icon icon="ph:caret-down-bold" :width="11" class="caret" />
+          </n-button>
         </n-dropdown>
         <template v-else>
           <n-button secondary type="primary" @click="authStore.openLoginModal()"> 登录 </n-button>
@@ -296,19 +301,22 @@ const options = computed<Array<DropdownOption | DropdownDividerOption>>(() => [
           >
             注册
           </n-button>
+          <!-- 没登录就没有个人菜单，暗色开关只能留在顶栏 -->
+          <n-button
+            quaternary
+            circle
+            :title="isDark ? '切换到亮色' : '切换到暗色'"
+            :aria-label="isDark ? '切换到亮色' : '切换到暗色'"
+            @click="toggleDark"
+          >
+            <template #icon>
+              <Icon :icon="isDark ? 'ph:sun' : 'ph:moon'" />
+            </template>
+          </n-button>
         </template>
       </template>
-      <n-button
-        quaternary
-        circle
-        :title="isDark ? '切换到亮色' : '切换到暗色'"
-        :aria-label="isDark ? '切换到亮色' : '切换到暗色'"
-        @click="toggleDark"
-      >
-        <template #icon>
-          <Icon :icon="isDark ? 'ph:sun' : 'ph:moon'" />
-        </template>
-      </n-button>
+      <!-- 放在最末尾：出现、消失时左边的东西都不挪 -->
+      <HelpButton />
     </div>
   </header>
 </template>
@@ -326,8 +334,12 @@ const options = computed<Array<DropdownOption | DropdownDividerOption>>(() => [
   white-space: nowrap;
 }
 
+.bar.compact {
+  gap: 20px;
+}
+
 /* 窄屏放不下一行：允许折行，高度跟着内容走 */
-.bar.mobile {
+.bar.wrap {
   height: auto;
   min-height: 55px;
   padding: 8px 12px;
@@ -349,13 +361,18 @@ const options = computed<Array<DropdownOption | DropdownDividerOption>>(() => [
 .nav {
   display: flex;
   align-items: center;
-  gap: 22px;
+  gap: 2px;
   flex: none;
 }
 
 .nav-link {
-  padding: 0;
+  height: 32px;
+  padding: 0 10px;
+  display: flex;
+  align-items: center;
+  gap: 3px;
   border: 0;
+  border-radius: 6px;
   background: transparent;
   font: inherit;
   cursor: pointer;
@@ -364,11 +381,14 @@ const options = computed<Array<DropdownOption | DropdownDividerOption>>(() => [
 }
 
 .nav-link:hover {
-  color: v-bind("theme.primaryColor");
+  background: v-bind("theme.hoverColor");
 }
 
+/* 当前页：浅绿底块（设计稿「顶栏重设计 · 定稿」）。字色在暗色下换浅一档，
+   深绿放在暗底上看不清 —— 和题目页课堂条同一个做法 */
 .nav-link.active {
-  color: v-bind("theme.primaryColorPressed");
+  background: v-bind("tone.activeBg");
+  color: v-bind("tone.activeText");
   font-weight: 600;
 }
 
@@ -379,11 +399,11 @@ const options = computed<Array<DropdownOption | DropdownDividerOption>>(() => [
 .actions {
   display: flex;
   align-items: center;
-  gap: 12px;
+  gap: 14px;
   flex: none;
 }
 
-.admin-link {
+.tool-link {
   display: flex;
   align-items: center;
   gap: 5px;
@@ -391,7 +411,8 @@ const options = computed<Array<DropdownOption | DropdownDividerOption>>(() => [
   text-decoration: none;
 }
 
-.admin-link:hover {
+.tool-link:hover,
+.tool-link.active {
   color: v-bind("theme.primaryColor");
 }
 
@@ -401,7 +422,45 @@ const options = computed<Array<DropdownOption | DropdownDividerOption>>(() => [
   background-color: v-bind("theme.dividerColor");
 }
 
-.jump {
-  width: 180px;
+/* 学生用户名最长有 25 个字符：按钮最宽 160，多出来的省略，全名在 title 里 */
+.name {
+  max-width: 160px;
+}
+
+/* 1024 宽、老师那版、名字按最长的算，160 会挤进右边距 */
+.bar.compact .name {
+  max-width: 120px;
+}
+
+.name :deep(.n-button__content) {
+  min-width: 0;
+  gap: 4px;
+}
+
+.name-text {
+  min-width: 0;
+  overflow: hidden;
+  text-overflow: ellipsis;
+}
+
+.caret {
+  flex: none;
+}
+</style>
+
+<!-- 暗色开关那一行是 render 出来挂在 dropdown 里的（teleport 到 body），scoped 够不着 -->
+<style>
+.theme-row {
+  display: flex;
+  align-items: center;
+  gap: 10px;
+  height: 40px;
+  padding: 0 14px 0 12px;
+  cursor: pointer;
+}
+
+.theme-row .theme-label {
+  flex: 1 1 0;
+  font-size: 15px;
 }
 </style>
diff --git a/apps/web/src/shared/components/HelpButton.vue b/apps/web/src/shared/components/HelpButton.vue
new file mode 100644
index 0000000..69dd96f
--- /dev/null
+++ b/apps/web/src/shared/components/HelpButton.vue
@@ -0,0 +1,108 @@
+<script setup lang="ts">
+import { Icon } from "@iconify/vue"
+import { useCollabStore } from "shared/store/collab"
+
+/**
+ * 老师顶栏上的「N 人举手」：前台顶栏和后台顶栏共用这一个。
+ *
+ * **没人在等就不渲染** —— 平时看不见，冒出来本身就是提醒。人已经在等、又来一个时，
+ * 按钮闪一下（约 1 秒、没声音、不挡内容），代替原来每来一个就弹一条的 toast：
+ * 那条 toast 一节课能弹十几次，讲台电脑投着屏的时候还弹在全班面前。
+ *
+ * 求助列表另有一个入口在课堂看板上，没人等的时候真想看「谁在处理」从那边进。
+ */
+const props = withDefaults(defineProps<{ size?: "medium" | "small" }>(), { size: "medium" })
+
+const collabStore = useCollabStore()
+const isDark = useDark()
+
+const count = computed(() => (collabStore.isTeacher ? collabStore.pendingCount : 0))
+
+// 每次变大就换一个 key，让 CSS 动画从头再放一遍；从 0 冒出来那次不闪，出现本身就够显眼
+const flashKey = ref(0)
+watch(count, (value, previous) => {
+  if (value === 0) flashKey.value = 0
+  else if (previous > 0 && value > previous) flashKey.value += 1
+})
+
+// 暗色下深红底放在暗底上看不清，换一套（和课堂条的做法一样，按明暗各给一组）
+const tone = computed(() =>
+  isDark.value
+    ? {
+        bg: "#3a1d24",
+        border: "#6b2d3a",
+        text: "#f28b9e",
+        flash: "#6b2d3a",
+        ring: "rgba(242, 139, 158, 0.25)",
+      }
+    : {
+        bg: "#fdecef",
+        border: "#f3c1cb",
+        text: "#b0213d",
+        flash: "#f7b9c6",
+        ring: "rgba(208, 48, 80, 0.18)",
+      },
+)
+</script>
+
+<template>
+  <button
+    v-if="count > 0"
+    :key="flashKey"
+    type="button"
+    class="help"
+    :class="[props.size, { flash: flashKey > 0 }]"
+    title="打开求助列表"
+    @click="collabStore.helpPanelOpen = true"
+  >
+    <Icon icon="ph:hand" :width="props.size === 'small' ? 14 : 15" />
+    <span>{{ count }} 人举手</span>
+  </button>
+</template>
+
+<style scoped>
+.help {
+  flex: none;
+  display: flex;
+  align-items: center;
+  gap: 5px;
+  height: 30px;
+  padding: 0 11px 0 9px;
+  border: 1px solid v-bind("tone.border");
+  border-radius: 15px;
+  background: v-bind("tone.bg");
+  color: v-bind("tone.text");
+  font: inherit;
+  font-weight: 600;
+  white-space: nowrap;
+  cursor: pointer;
+}
+
+.help.small {
+  height: 28px;
+  border-radius: 14px;
+  font-size: 13px;
+}
+
+.help.flash {
+  animation: flash 1s ease-out;
+}
+
+@keyframes flash {
+  0%,
+  40% {
+    background: v-bind("tone.flash");
+    box-shadow: 0 0 0 4px v-bind("tone.ring");
+  }
+  100% {
+    background: v-bind("tone.bg");
+    box-shadow: 0 0 0 0 transparent;
+  }
+}
+
+@media (prefers-reduced-motion: reduce) {
+  .help.flash {
+    animation: none;
+  }
+}
+</style>
diff --git a/apps/web/src/shared/components/ProblemJumpBox.vue b/apps/web/src/shared/components/ProblemJumpBox.vue
new file mode 100644
index 0000000..cfc55f3
--- /dev/null
+++ b/apps/web/src/shared/components/ProblemJumpBox.vue
@@ -0,0 +1,280 @@
+<script setup lang="ts">
+import { Icon } from "@iconify/vue"
+import { useThemeVars } from "naive-ui"
+import { useLessonStore } from "oj/store/lesson"
+import { useProblemJump } from "shared/composables/problemJump"
+import { useUserStore } from "shared/store/user"
+import type { ClassActivityProblem } from "utils/types"
+import { zonedParts } from "utils/functions"
+
+/**
+ * 顶栏的题号框：老师报完题号，学生在哪一页都能直接敲，不用先回首页或题目列表。
+ *
+ * 点进框里先列出「这节课的题」（和首页「班里在做」、题目页课堂条同一份数据），
+ * 没听清题号的学生不用问同桌；开始输入就只留对得上的。回车的行为没变：题号对上就
+ * 直达，对不上去题库搜（见 useProblemJump）。
+ *
+ * 列表只在**今天**有课、而且**不在题目页**时出现：接口会往前找最近 7 天里有课的那天，
+ * 周一早上拿到的是上周五的题，那不叫「这节课」；题目页顶上已经有课堂条，不再重复一份。
+ */
+const props = defineProps<{ compact?: boolean }>()
+
+const route = useRoute()
+const router = useRouter()
+const theme = useThemeVars()
+const isDark = useDark()
+const userStore = useUserStore()
+const lessonStore = useLessonStore()
+
+const { jump, jumping } = useProblemJump()
+const keyword = ref("")
+const focused = ref(false)
+const input = useTemplateRef<{ blur: () => void }>("input")
+
+/** 题目页的三种入口（题库 / 比赛 / 题单）顶上都有自己的上下文条 */
+const PROBLEM_PAGES = new Set(["problem", "contest problem", "problemset problem"])
+const onProblemPage = computed(() => PROBLEM_PAGES.has(String(route.name)))
+
+function todayKey() {
+  const now = zonedParts(new Date())!
+  return `${now.year}-${String(now.month).padStart(2, "0")}-${String(now.day).padStart(2, "0")}`
+}
+
+const lesson = computed(() => {
+  const activity = lessonStore.activity
+  if (!activity?.problems.length || activity.day !== todayKey()) return null
+  return activity
+})
+
+const done = computed(
+  () => lesson.value?.problems.filter((item) => item.myStatus === "accepted").length ?? 0,
+)
+
+/** 「下一道」是第一道还没做对的 —— 不在题目页上，没有「当前这道」可以往后数 */
+const nextId = computed(
+  () => lesson.value?.problems.find((item) => item.myStatus !== "accepted")?.problemDisplayId,
+)
+
+const filtered = computed(() => {
+  const list = lesson.value?.problems ?? []
+  const text = keyword.value.trim().toLowerCase()
+  if (!text) return list
+  return list.filter(
+    (item) =>
+      item.problemDisplayId.toLowerCase().includes(text) || item.title.toLowerCase().includes(text),
+  )
+})
+
+const open = computed(() => focused.value && !onProblemPage.value && filtered.value.length > 0)
+
+function handleFocus() {
+  focused.value = true
+  // 接口要求登录；store 自己有两分钟的缓存，来回点不会重复拉
+  if (userStore.isAuthed) lessonStore.load()
+}
+
+function close() {
+  input.value?.blur()
+  keyword.value = ""
+}
+
+async function handleEnter() {
+  const text = keyword.value
+  close()
+  await jump(text)
+}
+
+function openProblem(item: ClassActivityProblem) {
+  close()
+  router.push(`/problem/${item.problemDisplayId}`)
+}
+
+const STATUS_ICON: Record<ClassActivityProblem["myStatus"], string> = {
+  accepted: "ph:check-circle-fill",
+  tried: "ph:warning-circle-fill",
+  none: "ph:circle",
+}
+const statusColor = computed<Record<ClassActivityProblem["myStatus"], string>>(() => ({
+  accepted: theme.value.successColor,
+  tried: theme.value.warningColor,
+  none: theme.value.textColor3,
+}))
+
+const tone = computed(() => ({
+  label: isDark.value ? theme.value.primaryColor : theme.value.primaryColorPressed,
+  nextBg: isDark.value ? "rgba(99, 226, 183, 0.10)" : "#f3f9f5",
+  tagBg: isDark.value ? "rgba(99, 226, 183, 0.16)" : "#e7f5ed",
+}))
+
+/**
+ * 面板是 n-popover 传送到 body 下的，不在本组件根元素底下 —— scoped 样式里的 v-bind
+ * 生成的 CSS 变量挂在根元素上，面板取不到（实测整块透明）。所以变量直接挂在面板上
+ */
+const panelVars = computed(() => ({
+  "--jb-popoverColor": theme.value.popoverColor,
+  "--jb-borderRadius": theme.value.borderRadius,
+  "--jb-boxShadow2": theme.value.boxShadow2,
+  "--jb-dividerColor": theme.value.dividerColor,
+  "--jb-label": tone.value.label,
+  "--jb-textColor3": theme.value.textColor3,
+  "--jb-textColor1": theme.value.textColor1,
+  "--jb-hoverColor": theme.value.hoverColor,
+  "--jb-nextBg": tone.value.nextBg,
+  "--jb-textColor2": theme.value.textColor2,
+  "--jb-tagBg": tone.value.tagBg,
+}))
+</script>
+
+<template>
+  <n-popover trigger="manual" :show="open" placement="bottom-start" :show-arrow="false" raw>
+    <template #trigger>
+      <n-input
+        ref="input"
+        v-model:value="keyword"
+        class="jump"
+        :class="{ compact: props.compact }"
+        placeholder="输入题号直达"
+        :loading="jumping"
+        @focus="handleFocus"
+        @blur="focused = false"
+        @keyup.enter="handleEnter"
+        @keydown.esc="close"
+      >
+        <template #prefix>
+          <Icon icon="ph:magnifying-glass" />
+        </template>
+      </n-input>
+    </template>
+
+    <!-- mousedown 不让输入框失焦：一失焦 open 就变 false，面板先没了，click 落空 -->
+    <div class="panel" :style="panelVars" @mousedown.prevent>
+      <div class="head">
+        <span class="label">{{ lessonStore.label }}</span>
+        <span class="count">做完 {{ done }}/{{ lesson?.problems.length }}</span>
+      </div>
+      <a
+        v-for="item in filtered"
+        :key="item.problemDisplayId"
+        :href="`/problem/${item.problemDisplayId}`"
+        class="row"
+        :class="{ next: item.problemDisplayId === nextId, accepted: item.myStatus === 'accepted' }"
+        @click.prevent="openProblem(item)"
+      >
+        <Icon
+          :icon="STATUS_ICON[item.myStatus]"
+          :width="18"
+          :color="statusColor[item.myStatus]"
+          class="status"
+        />
+        <span class="id">{{ item.problemDisplayId }}</span>
+        <span class="title">{{ item.title }}</span>
+        <span v-if="item.problemDisplayId === nextId" class="tag">下一道</span>
+      </a>
+      <div class="foot">
+        {{ keyword.trim() ? "回车按题号直达，对不上就去题库搜" : "也可以直接输入题号，回车打开" }}
+      </div>
+    </div>
+  </n-popover>
+</template>
+
+<style scoped>
+.jump {
+  width: 240px;
+}
+
+.jump.compact {
+  width: 160px;
+}
+
+.panel {
+  width: 320px;
+  margin-top: 4px;
+  padding: 4px 0;
+  display: flex;
+  flex-direction: column;
+  background: var(--jb-popoverColor);
+  border-radius: var(--jb-borderRadius);
+  box-shadow: var(--jb-boxShadow2);
+  font-size: 14px;
+}
+
+.head {
+  height: 34px;
+  box-sizing: border-box;
+  margin-bottom: 4px;
+  padding: 0 12px;
+  display: flex;
+  align-items: center;
+  justify-content: space-between;
+  border-bottom: 1px solid var(--jb-dividerColor);
+  font-size: 13px;
+}
+
+.label {
+  font-weight: 600;
+  color: var(--jb-label);
+}
+
+.count {
+  color: var(--jb-textColor3);
+}
+
+.row {
+  height: 36px;
+  box-sizing: border-box;
+  padding: 0 12px;
+  display: flex;
+  align-items: center;
+  gap: 10px;
+  color: var(--jb-textColor1);
+  text-decoration: none;
+}
+
+.row:hover {
+  background: var(--jb-hoverColor);
+}
+
+.row.next {
+  background: var(--jb-nextBg);
+}
+
+.row.accepted {
+  color: var(--jb-textColor3);
+}
+
+.status {
+  flex: none;
+}
+
+.id {
+  flex: none;
+  min-width: 38px;
+  font-family: Consolas, Monaco, monospace;
+  color: var(--jb-textColor2);
+}
+
+.title {
+  flex: 1 1 0;
+  min-width: 0;
+  overflow: hidden;
+  text-overflow: ellipsis;
+  white-space: nowrap;
+}
+
+.tag {
+  flex: none;
+  padding: 1px 8px;
+  border-radius: 10px;
+  background: var(--jb-tagBg);
+  color: var(--jb-label);
+  font-size: 12px;
+}
+
+.foot {
+  margin-top: 4px;
+  padding: 8px 12px 6px;
+  border-top: 1px solid var(--jb-dividerColor);
+  font-size: 12px;
+  color: var(--jb-textColor3);
+}
+</style>
diff --git a/apps/web/src/shared/layout/admin.vue b/apps/web/src/shared/layout/admin.vue
index 73ed7c8..2323762 100644
--- a/apps/web/src/shared/layout/admin.vue
+++ b/apps/web/src/shared/layout/admin.vue
@@ -7,6 +7,7 @@ import { useDarkTransition } from "shared/composables/darkTransition"
 import { STORAGE_KEY } from "utils/constants"
 import storage from "utils/storage"
 import { useUserStore } from "../store/user"
+import HelpButton from "../components/HelpButton.vue"
 import type { MenuOption } from "naive-ui"
 
 const route = useRoute()
@@ -284,6 +285,9 @@ onMounted(async () => {
               <template v-if="!isMobile">{{ userStore.user.username }}</template>
             </n-button>
           </n-dropdown>
+          <!-- 老师在后台改题时也得知道有人举手（前台顶栏在这里是卸载的）。
+               和前台一样放最末尾，出现、消失时别的按钮不挪 -->
+          <HelpButton size="small" />
         </n-flex>
       </n-layout-header>
       <n-layout-content