diff --git a/apps/web/src/admin/setting/home.vue b/apps/web/src/admin/setting/home.vue
index 6080b0e..2825861 100644
--- a/apps/web/src/admin/setting/home.vue
+++ b/apps/web/src/admin/setting/home.vue
@@ -1,224 +1,367 @@
 <script setup lang="ts">
-import { h, onMounted, reactive, ref, watch } from "vue"
-import { useRouter } from "vue-router"
-import { NButton } from "naive-ui"
+import type { DashboardInfo } from "@oj2/contract"
+import { BarElement, CategoryScale, Chart as ChartJS, LinearScale, Tooltip } from "chart.js"
+import { useThemeVars } from "naive-ui"
+import { Bar } from "vue-chartjs"
+import { useChartTheme } from "shared/composables/chartTheme"
+import { rgba } from "oj/submission/composables/tone"
 import PageHeader from "admin/components/PageHeader.vue"
-import Pagination from "shared/components/Pagination.vue"
+import { classLabel, groupClassOptions } from "oj/submission/utils"
+import { useConfigStore } from "shared/store/config"
 import { useUserStore } from "shared/store/user"
-import { getACRate } from "utils/functions"
-import type { Rank } from "utils/types"
-import { getAdminUserRank, getBaseInfo, randomUser10 } from "../api"
+import { SubmissionStatus } from "utils/constants"
+import { getBaseInfo, randomUser10 } from "../api"
 
-const userCount = ref(0)
-const submissionCount = ref(0)
-const contestCount = ref(0)
-const judgeServerCount = ref(0)
-const userStore = useUserStore()
+/**
+ * 后台首页（设计稿「后台首页」AdminHome）：一块看板。上面一排看「现在」—— 判题机在不在、
+ * 今天交了多少其中有没有系统错误、现在几个人在线、哪个班在上课；中间一排全站的数（用户、题目、
+ * 提交、比赛、题单、自学、这周做题的人，用户要的「类似一个看板」）和最近 30 天每天交了几次；
+ * 最下面是常用的四个入口和「抽一个人」。
+ *
+ * 原来是总用户数 / 今日提交 / 近期比赛 / 判题机四个数，加一张要手输班级前缀的班级排名表 ——
+ * 总用户数、近期比赛没人看，排名前台排名页有（还更好看）。「随机抽签」上课点名用，留着，
+ * 班级改成下拉选，默认就是正在上课的那个班
+ */
+ChartJS.register(BarElement, CategoryScale, LinearScale, Tooltip)
+
+const theme = useThemeVars()
+const { chartKey } = useChartTheme()
 const router = useRouter()
-const showModal = ref(false)
+const userStore = useUserStore()
+const configStore = useConfigStore()
+
+const info = ref<DashboardInfo | null>(null)
+onMounted(async () => {
+  info.value = await getBaseInfo()
+  if (!luckyClass.value && info.value.activeClass) luckyClass.value = info.value.activeClass
+})
+
+const siteTiles = computed(() => {
+  const site = info.value?.site
+  if (!site) return []
+  const n = (value: number) => value.toLocaleString("zh-CN")
+  return [
+    { label: "学生", value: n(site.students), note: `老师 ${site.teachers} 人` },
+    {
+      label: "题目",
+      value: n(site.problems),
+      note: `学生看得到 ${n(site.visibleProblems)} 道`,
+      to: "/admin/problem/list",
+    },
+    { label: "提交", value: n(site.submissions), note: `这学期 ${n(site.termSubmissions)} 次` },
+    { label: "这周做题的人", value: n(site.weekActive), note: "周一起交过题的" },
+    { label: "比赛", value: n(site.contests), note: "", to: "/admin/contest/list" },
+    { label: "题单", value: n(site.problemSets), note: "", to: "/admin/problemset/list" },
+    { label: "自学", value: n(site.tutorials), note: "课", to: "/admin/tutorial/list" },
+  ]
+})
+
+/** 最近 30 天每天交了几次。今天那根用主色，其余淡一点 */
+const dailyData = computed(() => {
+  const daily = info.value?.daily ?? []
+  return {
+    labels: daily.map((d) => d.day.slice(5)),
+    datasets: [
+      {
+        data: daily.map((d) => d.count),
+        backgroundColor: daily.map((_, i) =>
+          i === daily.length - 1 ? theme.value.primaryColor : rgba(theme.value.primaryColor, 0.4),
+        ),
+        borderRadius: 3,
+        maxBarThickness: 22,
+      },
+    ],
+  }
+})
+const dailyOptions = {
+  responsive: true,
+  maintainAspectRatio: false,
+  plugins: {
+    legend: { display: false },
+    tooltip: {
+      callbacks: { label: (ctx: { parsed: { y: number | null } }) => `${ctx.parsed.y ?? 0} 次` },
+    },
+  },
+  scales: {
+    x: { grid: { display: false }, ticks: { maxRotation: 0, autoSkipPadding: 10 } },
+    y: { beginAtZero: true, ticks: { precision: 0 } },
+  },
+}
+
+function openSystemErrors() {
+  router.push({ name: "submissions", query: { result: String(SubmissionStatus.system_error) } })
+}
+
+const shortcuts = [
+  { label: "新建题目", to: "/admin/problem/create" },
+  { label: "新建比赛", to: "/admin/contest/create" },
+  { label: "批量建号", to: "/admin/user/generate" },
+  { label: "课堂看板", to: "/classroom" },
+]
+
+// ---------------------------------------------------------------- 抽一个人
+
+const classOptions = computed(() => groupClassOptions(configStore.config?.classList ?? []))
+const luckyClass = ref<string | null>(null)
 const luckyGuy = ref("")
 const isRolling = ref(false)
-const rollingNames = ref<string[]>([])
 const pulseKey = ref(0)
 let rollingTimer: ReturnType<typeof setInterval> | null = null
 let rollingStopper: ReturnType<typeof setTimeout> | null = null
-const data = ref<Rank[]>([])
-const total = ref(0)
-const query = reactive({
-  limit: 10,
-  page: 1,
-  classroom: "",
-})
-
-const columns: DataTableColumn<Rank>[] = [
-  {
-    title: "排名",
-    key: "index",
-    width: 80,
-    align: "center",
-    render: (_, index) => index + (query.page - 1) * query.limit + 1,
-  },
-  {
-    title: "用户",
-    key: "username",
-    width: 200,
-    render: (row) =>
-      h(
-        NButton,
-        {
-          text: true,
-          type: "info",
-          onClick: () => router.push("/user?name=" + row.user.username),
-        },
-        () => row.user.username,
-      ),
-  },
-  { title: "个性签名", key: "mood" },
-  { title: "已解决", key: "acceptedNumber", width: 100 },
-  { title: "提交数", key: "submissionNumber", width: 100 },
-  {
-    title: "正确率",
-    key: "rate",
-    width: 100,
-    render: (row) => getACRate(row.acceptedNumber, row.submissionNumber),
-  },
-]
-
-onMounted(async () => {
-  const res = await getBaseInfo()
-  userCount.value = res.userCount
-  submissionCount.value = res.todaySubmissionCount
-  contestCount.value = res.recentContestCount
-  judgeServerCount.value = res.judgeServerCount
-})
-
-async function listRanks() {
-  const offset = (query.page - 1) * query.limit
-  const res = await getAdminUserRank(offset, query.limit, query.classroom)
-  data.value = res.results
-  total.value = res.total
-}
 
 function stopRolling() {
-  if (rollingTimer) {
-    clearInterval(rollingTimer)
-    rollingTimer = null
-  }
-  if (rollingStopper) {
-    clearTimeout(rollingStopper)
-    rollingStopper = null
-  }
+  if (rollingTimer) clearInterval(rollingTimer)
+  if (rollingStopper) clearTimeout(rollingStopper)
+  rollingTimer = null
+  rollingStopper = null
   isRolling.value = false
 }
 
-function startRolling(finalName: string) {
+/** 名字滚两秒停下：接口一次给 10 个随机的，最后一个就是抽中的 */
+async function draw() {
+  if (!luckyClass.value) return
+  const prefix = `ks${luckyClass.value}`
+  const names = (await randomUser10(prefix)).map((name) => name.slice(prefix.length) || name)
+  if (!names.length) {
+    luckyGuy.value = "这个班没有人"
+    return
+  }
   stopRolling()
-  if (!rollingNames.value.length) return
   isRolling.value = true
-  const interval = 80
-  const duration = 2000
   let index = 0
   rollingTimer = setInterval(() => {
-    luckyGuy.value = rollingNames.value[index % rollingNames.value.length]
+    luckyGuy.value = names[index % names.length]!
     index += 1
-  }, interval)
+  }, 80)
   rollingStopper = setTimeout(() => {
     stopRolling()
-    luckyGuy.value = finalName
+    luckyGuy.value = names[names.length - 1]!
     pulseKey.value += 1
-  }, duration)
+  }, 2000)
 }
 
-async function getRandom() {
-  const res = await randomUser10(query.classroom)
-  const names = (res as string[]).map((name) => name.split(query.classroom)[1])
-  rollingNames.value = names
-  const finalName = names[names.length - 1]
-  startRolling(finalName)
-}
-
-async function getRandomModal() {
-  showModal.value = true
+watch(luckyClass, () => {
   stopRolling()
   luckyGuy.value = ""
-}
-
-watch(() => query.page, listRanks)
-watch(
-  () => query.limit,
-  () => {
-    query.page = 1
-    listRanks()
-  },
-)
-
-watch(
-  () => query.classroom,
-  (v) => {
-    query.page = 1
-    if (!v) {
-      data.value = []
-      total.value = 0
-    }
-  },
-)
-
-watch(showModal, (v) => {
-  if (!v) {
-    stopRolling()
-    luckyGuy.value = ""
-  }
 })
+onUnmounted(stopRolling)
 </script>
 
 <template>
-  <PageHeader :title="`你好，${userStore.user?.username ?? '管理员'}`">
-    <template #actions>
-      <n-button @click="router.push('/admin/contest/create')">新建比赛</n-button>
-      <n-button type="primary" @click="router.push('/admin/problem/create')">新建题目</n-button>
-    </template>
-  </PageHeader>
+  <PageHeader :title="`你好，${userStore.user?.username ?? '管理员'}`" />
 
-  <n-grid cols="2 m:4" :x-gap="12" :y-gap="12" responsive="screen" class="stats">
-    <n-gi>
-      <n-card size="small"><n-statistic label="总用户数" :value="userCount" /></n-card>
-    </n-gi>
-    <n-gi>
-      <n-card size="small"><n-statistic label="今日提交" :value="submissionCount" /></n-card>
-    </n-gi>
-    <n-gi>
-      <n-card size="small"><n-statistic label="近期比赛" :value="contestCount" /></n-card>
-    </n-gi>
-    <n-gi>
-      <!-- 判题机数量后端一直在下发，这里以前没显示 —— 判题机全掉线的时候，
-           这一栏是 0，比学生喊「交了没反应」早得多 -->
-      <n-card size="small">
-        <n-statistic label="在线判题机">
-          <n-text :type="judgeServerCount > 0 ? 'success' : 'error'">
-            {{ judgeServerCount }}
-          </n-text>
-        </n-statistic>
-      </n-card>
-    </n-gi>
-  </n-grid>
+  <div v-if="info" class="tiles">
+    <div class="tile">
+      <span class="label">判题机</span>
+      <b :class="info.judgeServerCount ? 'ok' : 'bad'">{{ info.judgeServerCount }} 台在线</b>
+      <span v-if="!info.judgeServerCount" class="bad-note">学生交了会一直判不出来</span>
+    </div>
+    <div class="tile">
+      <span class="label">今天提交</span>
+      <b>{{ info.todaySubmissionCount }} 次</b>
+      <button
+        v-if="info.todaySystemErrorCount"
+        type="button"
+        class="link bad-note"
+        @click="openSystemErrors"
+      >
+        系统错误 {{ info.todaySystemErrorCount }} 次 →
+      </button>
+      <span v-else class="note">系统错误 0 次</span>
+    </div>
+    <div class="tile">
+      <span class="label">现在在线</span>
+      <b>{{ info.onlineCount }} 人</b>
+      <span class="note">5 分钟内有动静的</span>
+    </div>
+    <div class="tile">
+      <span class="label">正在上课</span>
+      <b>{{ info.activeClass ? classLabel(info.activeClass) : "没有" }}</b>
+      <router-link
+        v-if="info.activeClass"
+        class="link"
+        :to="{ name: 'classroom board', query: { className: info.activeClass } }"
+      >
+        去课堂看板 →
+      </router-link>
+      <span v-else class="note">最近两小时没有哪个班在交题</span>
+    </div>
+  </div>
 
-  <n-card size="small" title="班级排名">
-    <template #header-extra>
-      <n-flex align="center" :size="8">
-        <n-input
-          style="width: 160px"
-          clearable
-          v-model:value="query.classroom"
-          placeholder="班级前缀"
-          @keyup.enter="listRanks"
-        />
-        <n-button secondary type="primary" @click="listRanks">查询</n-button>
-        <n-button v-if="query.classroom" @click="getRandomModal">随机抽签</n-button>
-      </n-flex>
-    </template>
-    <template v-if="data.length">
-      <n-data-table striped :data="data" :columns="columns" />
-      <Pagination :total="total" v-model:page="query.page" v-model:limit="query.limit" />
-    </template>
-    <n-empty v-else description="输入班级前缀后查询" style="padding: 24px 0" />
-  </n-card>
-  <n-modal preset="card" title="猜猜看幸运儿是谁？" v-model:show="showModal" style="width: 400px">
-    <n-flex vertical justify="center" align="center">
-      <n-h1 :key="pulseKey" class="lucky pulse">{{ luckyGuy }}</n-h1>
-      <n-button block :disabled="isRolling" @click="getRandom">
-        {{ luckyGuy ? "再来一次" : "开始抽签" }}
-      </n-button>
-    </n-flex>
-  </n-modal>
+  <div v-if="info" class="site">
+    <component
+      :is="tile.to ? 'router-link' : 'div'"
+      v-for="tile in siteTiles"
+      :key="tile.label"
+      :to="tile.to"
+      class="site-tile"
+      :class="{ clickable: tile.to }"
+    >
+      <span class="label">{{ tile.label }}</span>
+      <b>{{ tile.value }}</b>
+      <span class="note">{{ tile.note }}</span>
+    </component>
+  </div>
+
+  <div v-if="info" class="chart-card">
+    <div class="chart-head">
+      <b>最近 30 天每天交了几次</b>
+    </div>
+    <div class="chart">
+      <Bar :key="chartKey" :data="dailyData" :options="dailyOptions" />
+    </div>
+  </div>
+
+  <div class="shortcuts">
+    <n-button v-for="it in shortcuts" :key="it.to" size="large" @click="router.push(it.to)">
+      {{ it.label }}
+    </n-button>
+  </div>
+
+  <div class="lucky">
+    <b class="lucky-title">抽一个人</b>
+    <n-select
+      v-model:value="luckyClass"
+      :options="classOptions"
+      filterable
+      placeholder="选班级"
+      aria-label="班级"
+      style="width: 160px"
+    />
+    <span :key="pulseKey" class="lucky-name" :class="{ pulse: !isRolling && luckyGuy }">
+      {{ luckyGuy }}
+    </span>
+    <n-button type="primary" :disabled="!luckyClass || isRolling" @click="draw">
+      {{ luckyGuy ? "再抽一个" : "抽" }}
+    </n-button>
+  </div>
 </template>
 
 <style scoped>
-.stats {
-  margin-bottom: 16px;
+.tiles {
+  display: grid;
+  grid-template-columns: repeat(4, minmax(0, 1fr));
+  gap: 12px;
+  margin-bottom: 18px;
+}
+
+.tile {
+  display: flex;
+  flex-direction: column;
+  gap: 4px;
+  padding: 14px 16px;
+  border-radius: 10px;
+  border: 1px solid v-bind("theme.dividerColor");
+}
+
+.label,
+.note {
+  font-size: 13px;
+  color: v-bind("theme.textColor3");
+}
+
+.tile b {
+  font-size: 24px;
+  font-variant-numeric: tabular-nums;
+}
+
+.tile b.ok {
+  color: v-bind("theme.successColor");
+}
+
+.tile b.bad,
+.bad-note {
+  color: v-bind("theme.errorColor");
+}
+
+.bad-note {
+  font-size: 13px;
+}
+
+.link {
+  align-self: flex-start;
+  padding: 0;
+  border: 0;
+  background: none;
+  font: inherit;
+  font-size: 13px;
+  color: v-bind("theme.primaryColor");
+  text-decoration: none;
+  cursor: pointer;
+}
+
+.link:hover {
+  text-decoration: underline;
+}
+
+.site {
+  display: grid;
+  grid-template-columns: repeat(7, minmax(0, 1fr));
+  gap: 12px;
+  margin-bottom: 18px;
+}
+
+.site-tile {
+  display: flex;
+  flex-direction: column;
+  gap: 2px;
+  padding: 12px 14px;
+  border-radius: 10px;
+  background: v-bind("theme.actionColor");
+  color: inherit;
+  text-decoration: none;
+}
+
+.site-tile b {
+  font-size: 22px;
+  font-variant-numeric: tabular-nums;
+}
+
+.site-tile.clickable:hover {
+  background: v-bind("theme.hoverColor");
+}
+
+.chart-card {
+  margin-bottom: 18px;
+  padding: 14px 16px;
+  border-radius: 10px;
+  border: 1px solid v-bind("theme.dividerColor");
+}
+
+.chart-head {
+  margin-bottom: 8px;
+  font-size: 15px;
+}
+
+.chart {
+  height: 220px;
+}
+
+.shortcuts {
+  display: flex;
+  flex-wrap: wrap;
+  gap: 10px;
+  margin-bottom: 18px;
 }
 
 .lucky {
-  height: 48px;
+  display: inline-flex;
+  align-items: center;
+  gap: 14px;
+  padding: 16px 18px;
+  border-radius: 10px;
+  border: 1px solid v-bind("theme.dividerColor");
+}
+
+.lucky-title {
+  font-size: 15px;
+}
+
+.lucky-name {
+  min-width: 120px;
+  font-size: 26px;
+  font-weight: 700;
+  text-align: center;
 }
 
 .pulse {
@@ -236,4 +379,11 @@ watch(showModal, (v) => {
     transform: scale(1);
   }
 }
+
+@media (max-width: 900px) {
+  .tiles,
+  .site {
+    grid-template-columns: repeat(2, minmax(0, 1fr));
+  }
+}
 </style>