diff --git a/playground/src/api/service/org/classroom-monitor.ts b/playground/src/api/service/org/classroom-monitor.ts
index 555e9b9..68c19eb 100644
--- a/playground/src/api/service/org/classroom-monitor.ts
+++ b/playground/src/api/service/org/classroom-monitor.ts
@@ -5,6 +5,8 @@ import { get, post } from '#/api/http'
 export type ClassroomItem = {
   id: number | string
   name: string
+  /** 1 监控开启，0 关闭 */
+  monitorState?: number
 }
 
 export type ClassMonitorCurrent = {
@@ -25,6 +27,61 @@ export type ClassMonitorSnapshot = {
   studentName: string
 }
 
+export type ClassMonitorStudentSnapshot = {
+  ts: number
+  url: string
+}
+
+export type ClassMonitorSessionRow = {
+  classId: number | string
+  className: string
+  durationSec: number
+  endTime: string
+  intervalMs: number
+  schoolId: number | string
+  sessionId: number | string
+  snapshotCount: number
+  startTime: string
+  status: number
+  studentCount: number
+  teacherId: number | string
+  teacherName: string
+}
+
+/** `/school/classMonitor/sessionDetail` 中 data 内单条学生（与列表快照字段接近，可能含 snapshotCount） */
+export type ClassMonitorSessionDetailStudent = {
+  avatar: string
+  latestTs: number
+  latestUrl: string
+  snapshotCount?: number
+  staleSeconds?: number
+  studentId: number | string
+  studentName: string
+}
+
+/** `/school/classMonitor/sessionDetail` 返回的 data 对象 */
+export type ClassMonitorSessionDetail = {
+  classId: number | string
+  className: string
+  durationSec: number
+  endTime: string
+  intervalMs: number
+  schoolId: number | string
+  sessionId: number | string
+  snapshotCount: number
+  startTime: string
+  status: number
+  studentCount: number
+  students: ClassMonitorSessionDetailStudent[]
+  teacherId: number | string
+  teacherName: string
+}
+
+/** 分页里的扩展字段 rainbow 暂不消费 */
+export type ClassMonitorSessionsPage = PageResponse<ClassMonitorSessionRow> & {
+  rainbow?: unknown[]
+}
+
 class ClassroomMonitorService {
   async getClassList() {
     return await get<PageResponse<ClassroomItem>>('/org/class/list', {
@@ -46,6 +103,41 @@ class ClassroomMonitorService {
     )
   }
 
+  async getStudentSnapshots(
+    sessionId: number | string,
+    studentId: number | string,
+  ) {
+    return await get<ClassMonitorStudentSnapshot[]>(
+      '/school/classMonitor/studentSnapshots',
+      { sessionId, studentId },
+    )
+  }
+
+  async getSessions(
+    classId: number | string,
+    params?: { current?: number; size?: number },
+  ) {
+    return await post<ClassMonitorSessionsPage>('/school/classMonitor/sessions', {
+      classId,
+      current: params?.current ?? 1,
+      size: params?.size ?? 10,
+    })
+  }
+
+  async getSessionDetail(
+    sessionId: number | string,
+    classId?: number | string,
+  ) {
+    const params: Record<string, number | string> = { sessionId }
+    if (classId !== undefined && classId !== '') {
+      params.classId = classId
+    }
+    return await get<ClassMonitorSessionDetail>(
+      '/school/classMonitor/sessionDetail',
+      params,
+    )
+  }
+
   async updateMonitorStatus(classId: number | string, status: 0 | 1) {
     return await post('/school/classMonitor/control', {
       classId,
diff --git a/playground/src/views/org/class-mgr/home.vue b/playground/src/views/org/class-mgr/home.vue
index c4867ef..5c484e2 100644
--- a/playground/src/views/org/class-mgr/home.vue
+++ b/playground/src/views/org/class-mgr/home.vue
@@ -324,12 +324,20 @@ function updateScreenLock(row: any, status: 0 | 1) {
       v-bind="$attrs"
     >
       <template #operation="{ row }">
-        <el-button type="danger" @click="updateScreenLock(row, 1)">
-          锁屏
-        </el-button>
-        <el-button type="success" @click="updateScreenLock(row, 0)">
+        <el-button
+          v-if="row.screenLock === 1"
+          type="success"
+          @click="updateScreenLock(row, 0)"
+        >
           解锁
         </el-button>
+        <el-button
+          v-else
+          type="danger"
+          @click="updateScreenLock(row, 1)"
+        >
+          锁屏
+        </el-button>
       </template>
       <template #currencyFlag="{ row }">
         <el-switch
diff --git a/playground/src/views/org/classroom-monitor/home.vue b/playground/src/views/org/classroom-monitor/home.vue
index 816b8a5..b1a5f0c 100644
--- a/playground/src/views/org/classroom-monitor/home.vue
+++ b/playground/src/views/org/classroom-monitor/home.vue
@@ -1,31 +1,58 @@
 <script setup lang="ts">
 import type {
   ClassMonitorCurrent,
+  ClassMonitorSessionRow,
   ClassMonitorSnapshot,
+  ClassMonitorStudentSnapshot,
   ClassroomItem,
 } from '../../../api/service/org/classroom-monitor'
 
-import { computed, onMounted, ref } from 'vue'
+import { computed, onBeforeUnmount, onMounted, reactive, ref } from 'vue'
+import { useRouter } from 'vue-router'
 
 import { classroomMonitorService } from '../../../api/service/org/classroom-monitor'
 import hud from '../../../utils/hud'
 
+const router = useRouter()
+
 const classLoading = ref(false)
 const detailLoading = ref(false)
 const snapshotLoading = ref(false)
 const controlLoading = ref(false)
+const studentSnapshotLoading = ref(false)
 
 const classList = ref<ClassroomItem[]>([])
 const selectedClass = ref<ClassroomItem>()
 const currentMonitor = ref<ClassMonitorCurrent>()
 const snapshots = ref<ClassMonitorSnapshot[]>([])
+const selectedSnapshotStudent = ref<ClassMonitorSnapshot>()
+const studentSnapshots = ref<ClassMonitorStudentSnapshot[]>([])
+const studentSnapshotDialogVisible = ref(false)
+
+const sessionsDialogVisible = ref(false)
+const sessionsLoading = ref(false)
+const sessionsRows = ref<ClassMonitorSessionRow[]>([])
+const sessionsPage = reactive({
+  current: 1,
+  size: 10,
+  total: 0,
+})
 
 const isMonitoring = computed(() => currentMonitor.value?.monitoring === true)
+const studentSnapshotPreviewList = computed(() => {
+  return studentSnapshots.value.map((item) => item.url).filter(Boolean)
+})
+const SNAPSHOT_REFRESH_INTERVAL = 5000
+let snapshotRefreshTimer: ReturnType<typeof setInterval> | undefined
 
 onMounted(() => {
   loadClassList()
 })
 
+onBeforeUnmount(() => {
+  stopSnapshotAutoRefresh()
+})
+
 async function loadClassList() {
   classLoading.value = true
   try {
@@ -37,6 +64,7 @@ async function loadClassList() {
 }
 
 async function handleViewMonitor(item: ClassroomItem) {
+  stopSnapshotAutoRefresh()
   selectedClass.value = item
   currentMonitor.value = undefined
   snapshots.value = []
@@ -51,7 +79,9 @@ async function loadMonitorDetail(classId = selectedClass.value?.id) {
     currentMonitor.value = data
     if (data?.monitoring) {
       await loadSnapshots(classId)
+      startSnapshotAutoRefresh()
     } else {
+      stopSnapshotAutoRefresh()
       snapshots.value = []
     }
   } finally {
@@ -69,6 +99,44 @@ async function loadSnapshots(classId = selectedClass.value?.id) {
   }
 }
 
+async function openStudentSnapshots(item: ClassMonitorSnapshot) {
+  if (!currentMonitor.value?.sessionId) {
+    hud.error('暂无监控会话')
+    return
+  }
+  selectedSnapshotStudent.value = item
+  studentSnapshots.value = []
+  studentSnapshotDialogVisible.value = true
+  studentSnapshotLoading.value = true
+  try {
+    studentSnapshots.value = await classroomMonitorService.getStudentSnapshots(
+      currentMonitor.value.sessionId,
+      item.studentId,
+    )
+  } finally {
+    studentSnapshotLoading.value = false
+  }
+}
+
+function startSnapshotAutoRefresh() {
+  if (snapshotRefreshTimer) return
+  snapshotRefreshTimer = setInterval(() => {
+    if (!isMonitoring.value || !selectedClass.value?.id) {
+      stopSnapshotAutoRefresh()
+      return
+    }
+    if (!snapshotLoading.value) {
+      loadSnapshots(selectedClass.value.id)
+    }
+  }, SNAPSHOT_REFRESH_INTERVAL)
+}
+
+function stopSnapshotAutoRefresh() {
+  if (!snapshotRefreshTimer) return
+  clearInterval(snapshotRefreshTimer)
+  snapshotRefreshTimer = undefined
+}
+
 async function updateMonitorStatus(status: 0 | 1) {
   if (!selectedClass.value?.id) return
   const option = status === 1 ? '开启' : '停止'
@@ -83,9 +151,68 @@ async function updateMonitorStatus(status: 0 | 1) {
 }
 
 function backToClassList() {
+  stopSnapshotAutoRefresh()
   selectedClass.value = undefined
   currentMonitor.value = undefined
   snapshots.value = []
+  studentSnapshotDialogVisible.value = false
+  sessionsDialogVisible.value = false
+}
+
+function formatDurationSec(sec?: number | string) {
+  if (sec === undefined || sec === null || sec === '') return '-'
+  const n = Number(sec)
+  if (Number.isNaN(n) || n < 0) return '-'
+  const s = Math.floor(n)
+  const m = Math.floor(s / 60)
+  const rest = s % 60
+  if (m === 0) return `${rest}秒`
+  return `${m}分${rest}秒`
+}
+
+async function openHistoryMonitor() {
+  if (!selectedClass.value?.id) return
+  sessionsPage.current = 1
+  sessionsDialogVisible.value = true
+  await loadSessions()
+}
+
+async function loadSessions() {
+  if (!selectedClass.value?.id) return
+  sessionsLoading.value = true
+  try {
+    const data = await classroomMonitorService.getSessions(selectedClass.value.id, {
+      current: sessionsPage.current,
+      size: sessionsPage.size,
+    })
+    sessionsRows.value = data?.rows ?? []
+    sessionsPage.total = data?.totalRows ?? 0
+  } finally {
+    sessionsLoading.value = false
+  }
+}
+
+function onSessionsSizeChange(size: number) {
+  sessionsPage.size = size
+  sessionsPage.current = 1
+  loadSessions()
+}
+
+function onSessionsPageChange(p: number) {
+  sessionsPage.current = p
+  loadSessions()
+}
+
+function onSessionRowClick(row: ClassMonitorSessionRow) {
+  if (!selectedClass.value) return
+  sessionsDialogVisible.value = false
+  router.push({
+    path: `/org/classroom-monitor/session/${encodeURIComponent(String(row.sessionId))}`,
+    query: {
+      classId: String(selectedClass.value.id),
+      className: selectedClass.value.name ?? '',
+    },
+  })
 }
 
 function formatTime(time?: number | string) {
@@ -115,7 +242,17 @@ function formatTime(time?: number | string) {
 
       <div v-loading="classLoading" class="class-list">
         <div v-for="item in classList" :key="item.id" class="class-row">
-          <span class="class-name">{{ item.name }}</span>
+          <div class="class-row-info">
+            <span class="class-name">{{ item.name }}</span>
+            <el-tag
+              :type="item.monitorState === 1 ? 'success' : 'info'"
+              size="small"
+            >
+              {{
+                item.monitorState === 1 ? '监控开启' : '监控关闭'
+              }}
+            </el-tag>
+          </div>
           <el-button type="primary" @click="handleViewMonitor(item)">
             查看监控
           </el-button>
@@ -134,6 +271,7 @@ function formatTime(time?: number | string) {
           </div>
           <div class="header-actions">
             <el-button @click="backToClassList">返回班级列表</el-button>
+            <el-button @click="openHistoryMonitor">历史监控</el-button>
             <el-button
               :loading="detailLoading || snapshotLoading"
               type="primary"
@@ -193,12 +331,12 @@ function formatTime(time?: number | string) {
               :key="item.studentId"
               class="snapshot-card"
               shadow="hover"
+              @click="openStudentSnapshots(item)"
             >
               <el-image
                 v-if="item.latestUrl"
                 class="snapshot-image"
                 fit="cover"
-                :preview-src-list="[item.latestUrl]"
                 :src="item.latestUrl"
               />
               <div v-else class="snapshot-empty">暂无截图</div>
@@ -227,6 +365,104 @@ function formatTime(time?: number | string) {
         </template>
       </div>
     </el-card>
+
+    <el-dialog
+      v-model="sessionsDialogVisible"
+      title="历史监控"
+      width="960px"
+      align-center
+      destroy-on-close
+    >
+      <div v-loading="sessionsLoading">
+        <el-table
+          :data="sessionsRows"
+          stripe
+          highlight-current-row
+          class="sessions-table"
+          @row-click="onSessionRowClick"
+        >
+          <el-table-column prop="sessionId" label="会话 ID" width="100" />
+          <el-table-column prop="teacherName" label="教师" min-width="110" />
+          <el-table-column prop="startTime" label="开始时间" min-width="160" />
+          <el-table-column prop="endTime" label="结束时间" min-width="160" />
+          <el-table-column label="时长" width="110">
+            <template #default="{ row }">
+              {{ formatDurationSec(row.durationSec) }}
+            </template>
+          </el-table-column>
+          <el-table-column prop="studentCount" label="学生数" width="88" />
+          <el-table-column prop="snapshotCount" label="截图数" width="88" />
+          <el-table-column prop="status" label="状态" width="80" />
+          <el-table-column prop="intervalMs" label="采集间隔(ms)" width="120" />
+          <el-table-column label="操作" width="88" fixed="right">
+            <template #default="{ row }">
+              <el-button type="primary" link @click.stop="onSessionRowClick(row)">
+                查看
+              </el-button>
+            </template>
+          </el-table-column>
+        </el-table>
+
+        <div class="sessions-pagination">
+          <el-pagination
+            :current-page="sessionsPage.current"
+            :page-size="sessionsPage.size"
+            layout="total, sizes, prev, pager, next"
+            :total="sessionsPage.total"
+            :page-sizes="[10, 20, 50]"
+            @current-change="onSessionsPageChange"
+            @size-change="onSessionsSizeChange"
+          />
+        </div>
+      </div>
+    </el-dialog>
+
+    <el-dialog
+      v-model="studentSnapshotDialogVisible"
+      :title="`${selectedSnapshotStudent?.studentName || '-'}的全部截图`"
+      width="900px"
+      align-center
+      destroy-on-close
+    >
+      <div v-loading="studentSnapshotLoading" class="student-snapshot-dialog">
+        <div class="student-snapshot-summary">
+          <el-avatar :size="40" :src="selectedSnapshotStudent?.avatar">
+            {{ selectedSnapshotStudent?.studentName?.slice(0, 1) || '学' }}
+          </el-avatar>
+          <div>
+            <div class="student-name">
+              {{ selectedSnapshotStudent?.studentName || '-' }}
+            </div>
+            <div class="student-meta">
+              共 {{ studentSnapshots.length }} 张截图
+            </div>
+          </div>
+        </div>
+
+        <div v-if="studentSnapshots.length" class="student-snapshot-list">
+          <div
+            v-for="item in studentSnapshots"
+            :key="`${item.ts}-${item.url}`"
+            class="student-snapshot-item"
+          >
+            <el-image
+              class="student-snapshot-image"
+              fit="cover"
+              :preview-src-list="studentSnapshotPreviewList"
+              :src="item.url"
+            />
+            <div class="student-meta">
+              截图时间：{{ formatTime(item.ts) }}
+            </div>
+          </div>
+        </div>
+
+        <el-empty
+          v-else-if="!studentSnapshotLoading"
+          description="暂无截图"
+        />
+      </div>
+    </el-dialog>
   </div>
 </template>
 
@@ -277,6 +513,14 @@ function formatTime(time?: number | string) {
     }
   }
 
+  .class-row-info {
+    display: flex;
+    align-items: center;
+    gap: 12px;
+    flex-wrap: wrap;
+    min-width: 0;
+  }
+
   .class-name {
     color: #111827;
     font-size: 16px;
@@ -335,7 +579,15 @@ function formatTime(time?: number | string) {
   }
 
   .snapshot-card {
+    cursor: pointer;
     overflow: hidden;
+    transition:
+      border-color 0.2s,
+      box-shadow 0.2s;
+
+    &:hover {
+      border-color: #409eff;
+    }
   }
 
   .snapshot-image,
@@ -369,6 +621,50 @@ function formatTime(time?: number | string) {
     color: #6b7280;
     font-size: 12px;
   }
+
+  .student-snapshot-dialog {
+    min-height: 240px;
+  }
+
+  .student-snapshot-summary {
+    display: flex;
+    align-items: center;
+    gap: 12px;
+    padding-bottom: 16px;
+    margin-bottom: 16px;
+    border-bottom: 1px solid #edf0f5;
+  }
+
+  .student-snapshot-list {
+    display: grid;
+    grid-template-columns: repeat(3, minmax(0, 1fr));
+    gap: 16px;
+    max-height: 620px;
+    overflow-y: auto;
+  }
+
+  .student-snapshot-item {
+    padding: 12px;
+    border: 1px solid #edf0f5;
+    border-radius: 8px;
+  }
+
+  .student-snapshot-image {
+    width: 100%;
+    height: 180px;
+    border-radius: 8px;
+  }
+
+  .sessions-table {
+    cursor: pointer;
+    width: 100%;
+  }
+
+  .sessions-pagination {
+    margin-top: 16px;
+    display: flex;
+    justify-content: flex-end;
+  }
 }
 
 @media (max-width: 1400px) {
@@ -376,6 +672,10 @@ function formatTime(time?: number | string) {
     .snapshot-grid {
       grid-template-columns: repeat(3, minmax(0, 1fr));
     }
+
+    .student-snapshot-list {
+      grid-template-columns: repeat(2, minmax(0, 1fr));
+    }
   }
 }
 
@@ -408,6 +708,10 @@ function formatTime(time?: number | string) {
     .snapshot-grid {
       grid-template-columns: 1fr;
     }
+
+    .student-snapshot-list {
+      grid-template-columns: 1fr;
+    }
   }
 }
 </style>
diff --git a/playground/src/views/org/classroom-monitor/routes.ts b/playground/src/views/org/classroom-monitor/routes.ts
new file mode 100644
index 0000000..fd19960
--- /dev/null
+++ b/playground/src/views/org/classroom-monitor/routes.ts
@@ -0,0 +1,15 @@
+import type { RouteRecordRaw } from 'vue-router'
+
+const routes: RouteRecordRaw[] = [
+  {
+    path: '/org/classroom-monitor/session/:sessionId',
+    name: 'ClassroomMonitorSessionDetail',
+    component: () => import('./session-detail.vue'),
+    meta: {
+      title: '历史监控会话',
+      hideInMenu: true,
+    },
+  },
+]
+
+export default routes
diff --git a/playground/src/views/org/classroom-monitor/session-detail.vue b/playground/src/views/org/classroom-monitor/session-detail.vue
new file mode 100644
index 0000000..5c8b161
--- /dev/null
+++ b/playground/src/views/org/classroom-monitor/session-detail.vue
@@ -0,0 +1,417 @@
+<script setup lang="ts">
+import type {
+  ClassMonitorSessionDetail,
+  ClassMonitorSessionDetailStudent,
+  ClassMonitorSnapshot,
+  ClassMonitorStudentSnapshot,
+} from '../../../api/service/org/classroom-monitor'
+
+import { computed, ref, watch } from 'vue'
+import { useRoute, useRouter } from 'vue-router'
+
+import { classroomMonitorService } from '../../../api/service/org/classroom-monitor'
+import hud from '../../../utils/hud'
+
+const route = useRoute()
+const router = useRouter()
+
+const detailLoading = ref(false)
+const studentSnapshotLoading = ref(false)
+const snapshots = ref<ClassMonitorSnapshot[]>([])
+const selectedSnapshotStudent = ref<ClassMonitorSnapshot>()
+const studentSnapshots = ref<ClassMonitorStudentSnapshot[]>([])
+const studentSnapshotDialogVisible = ref(false)
+const sessionMeta = ref<ClassMonitorSessionDetail | null>(null)
+
+const sessionId = computed(() => String(route.params.sessionId || ''))
+const classId = computed(() => {
+  const q = route.query.classId
+  if (typeof q === 'string' && q) return q
+  if (Array.isArray(q) && q[0]) return String(q[0])
+  return ''
+})
+const classDisplayName = computed(() => {
+  const q = route.query.className
+  if (typeof q === 'string' && q) return q
+  const fromApi = sessionMeta.value?.className
+  return typeof fromApi === 'string' && fromApi ? fromApi : ''
+})
+
+const studentSnapshotPreviewList = computed(() => {
+  return studentSnapshots.value.map((item) => item.url).filter(Boolean)
+})
+
+watch(
+  () => [sessionId.value, classId.value] as const,
+  ([id]) => {
+    if (id) loadSessionDetail()
+  },
+  { immediate: true },
+)
+
+function isValidSessionStudent(
+  row: unknown,
+): row is ClassMonitorSessionDetailStudent {
+  if (row == null || typeof row !== 'object') return false
+  const r = row as ClassMonitorSessionDetailStudent
+  return r.studentId != null && r.studentId !== ''
+}
+
+function mapSessionStudentToSnapshot(
+  s: ClassMonitorSessionDetailStudent,
+): ClassMonitorSnapshot {
+  return {
+    avatar: s.avatar ?? '',
+    latestTs: s.latestTs,
+    latestUrl: s.latestUrl ?? '',
+    staleSeconds: s.staleSeconds ?? 0,
+    studentId: s.studentId,
+    studentName: s.studentName ?? '',
+  }
+}
+
+async function loadSessionDetail() {
+  const sid = sessionId.value
+  if (!sid) return
+  detailLoading.value = true
+  try {
+    const cid = classId.value
+    const detail = await classroomMonitorService.getSessionDetail(
+      sid,
+      cid || undefined,
+    )
+    sessionMeta.value = detail ?? null
+    const students = detail?.students ?? []
+    snapshots.value = students
+      .filter(isValidSessionStudent)
+      .map(mapSessionStudentToSnapshot)
+  } finally {
+    detailLoading.value = false
+  }
+}
+
+async function openStudentSnapshots(item: ClassMonitorSnapshot) {
+  const sid = sessionId.value
+  if (!sid) {
+    hud.error('暂无会话')
+    return
+  }
+  if (item?.studentId == null || item.studentId === '') {
+    hud.error('学生信息不完整')
+    return
+  }
+  selectedSnapshotStudent.value = item
+  studentSnapshots.value = []
+  studentSnapshotDialogVisible.value = true
+  studentSnapshotLoading.value = true
+  try {
+    studentSnapshots.value = await classroomMonitorService.getStudentSnapshots(
+      sid,
+      item.studentId,
+    )
+  } finally {
+    studentSnapshotLoading.value = false
+  }
+}
+
+function formatTime(time?: number | string) {
+  if (!time) return '-'
+  const timestamp = Number(time)
+  if (Number.isNaN(timestamp)) return String(time)
+  const date = new Date(String(timestamp).length === 10 ? timestamp * 1000 : timestamp)
+  if (Number.isNaN(date.getTime())) return String(time)
+  return date.toLocaleString()
+}
+</script>
+
+<template>
+  <div class="classroom-monitor-session g-container">
+    <el-card class="content-card" shadow="never">
+      <template #header>
+        <div class="card-header">
+          <div>
+            <div class="page-title">
+              {{ classDisplayName ? `${classDisplayName} · ` : '' }}历史会话
+            </div>
+            <div class="page-desc">
+              会话 ID：{{ sessionId || '-' }}
+            </div>
+          </div>
+          <div class="header-actions">
+            <el-button @click="router.back()">返回</el-button>
+            <el-button :loading="detailLoading" type="primary" @click="loadSessionDetail()">
+              刷新
+            </el-button>
+          </div>
+        </div>
+      </template>
+
+      <div v-loading="detailLoading" class="snapshot-section">
+        <div class="snapshot-header">
+          <div class="section-title">学生监控信息</div>
+        </div>
+
+        <div class="snapshot-grid">
+          <el-card
+            v-for="(item, idx) in snapshots"
+            :key="`${item.studentId}-${idx}`"
+            class="snapshot-card"
+            shadow="hover"
+            @click="openStudentSnapshots(item)"
+          >
+            <el-image
+              v-if="item.latestUrl"
+              class="snapshot-image"
+              fit="cover"
+              :src="item.latestUrl"
+            />
+            <div v-else class="snapshot-empty">暂无截图</div>
+
+            <div class="student-info">
+              <el-avatar :size="36" :src="item.avatar">
+                {{ item.studentName?.slice(0, 1) || '学' }}
+              </el-avatar>
+              <div>
+                <div class="student-name">{{ item.studentName || '-' }}</div>
+                <div class="student-meta">
+                  最新时间：{{ formatTime(item.latestTs) }}
+                </div>
+                <div class="student-meta">
+                  延迟：{{ item.staleSeconds ?? 0 }}秒
+                </div>
+              </div>
+            </div>
+          </el-card>
+
+          <el-empty
+            v-if="!detailLoading && snapshots.length === 0"
+            description="暂无学生监控信息"
+          />
+        </div>
+      </div>
+    </el-card>
+
+    <el-dialog
+      v-model="studentSnapshotDialogVisible"
+      :title="`${selectedSnapshotStudent?.studentName || '-'}的全部截图`"
+      width="900px"
+      align-center
+      destroy-on-close
+    >
+      <div v-loading="studentSnapshotLoading" class="student-snapshot-dialog">
+        <div class="student-snapshot-summary">
+          <el-avatar :size="40" :src="selectedSnapshotStudent?.avatar">
+            {{ selectedSnapshotStudent?.studentName?.slice(0, 1) || '学' }}
+          </el-avatar>
+          <div>
+            <div class="student-name">
+              {{ selectedSnapshotStudent?.studentName || '-' }}
+            </div>
+            <div class="student-meta">
+              共 {{ studentSnapshots.length }} 张截图
+            </div>
+          </div>
+        </div>
+
+        <div v-if="studentSnapshots.length" class="student-snapshot-list">
+          <div
+            v-for="item in studentSnapshots"
+            :key="`${item.ts}-${item.url}`"
+            class="student-snapshot-item"
+          >
+            <el-image
+              class="student-snapshot-image"
+              fit="cover"
+              :preview-src-list="studentSnapshotPreviewList"
+              :src="item.url"
+            />
+            <div class="student-meta">
+              截图时间：{{ formatTime(item.ts) }}
+            </div>
+          </div>
+        </div>
+
+        <el-empty
+          v-else-if="!studentSnapshotLoading"
+          description="暂无截图"
+        />
+      </div>
+    </el-dialog>
+  </div>
+</template>
+
+<style lang="scss" scoped>
+.classroom-monitor-session {
+  .content-card {
+    min-height: 360px;
+    border: 1px solid #edf0f5;
+  }
+
+  .card-header {
+    display: flex;
+    align-items: center;
+    justify-content: space-between;
+    gap: 16px;
+  }
+
+  .page-title {
+    color: #1f2937;
+    font-size: 20px;
+    font-weight: 600;
+  }
+
+  .page-desc {
+    margin-top: 6px;
+    color: #6b7280;
+    font-size: 14px;
+  }
+
+  .header-actions {
+    display: flex;
+    gap: 12px;
+  }
+
+  .snapshot-section {
+    min-height: 260px;
+  }
+
+  .snapshot-header {
+    display: flex;
+    align-items: center;
+    justify-content: space-between;
+    margin-bottom: 16px;
+  }
+
+  .section-title {
+    color: #111827;
+    font-size: 16px;
+    font-weight: 600;
+  }
+
+  .snapshot-grid {
+    display: grid;
+    min-height: 220px;
+    grid-template-columns: repeat(4, minmax(0, 1fr));
+    gap: 16px;
+  }
+
+  .snapshot-card {
+    cursor: pointer;
+    overflow: hidden;
+    transition:
+      border-color 0.2s,
+      box-shadow 0.2s;
+
+    &:hover {
+      border-color: #409eff;
+    }
+  }
+
+  .snapshot-image,
+  .snapshot-empty {
+    width: 100%;
+    height: 180px;
+    border-radius: 8px;
+  }
+
+  .snapshot-empty {
+    display: flex;
+    align-items: center;
+    justify-content: center;
+    color: #9ca3af;
+    background: #f3f4f6;
+  }
+
+  .student-info {
+    display: flex;
+    gap: 10px;
+    margin-top: 12px;
+  }
+
+  .student-name {
+    color: #111827;
+    font-weight: 600;
+  }
+
+  .student-meta {
+    margin-top: 4px;
+    color: #6b7280;
+    font-size: 12px;
+  }
+
+  .student-snapshot-dialog {
+    min-height: 240px;
+  }
+
+  .student-snapshot-summary {
+    display: flex;
+    align-items: center;
+    gap: 12px;
+    padding-bottom: 16px;
+    margin-bottom: 16px;
+    border-bottom: 1px solid #edf0f5;
+  }
+
+  .student-snapshot-list {
+    display: grid;
+    grid-template-columns: repeat(3, minmax(0, 1fr));
+    gap: 16px;
+    max-height: 620px;
+    overflow-y: auto;
+  }
+
+  .student-snapshot-item {
+    padding: 12px;
+    border: 1px solid #edf0f5;
+    border-radius: 8px;
+  }
+
+  .student-snapshot-image {
+    width: 100%;
+    height: 180px;
+    border-radius: 8px;
+  }
+}
+
+@media (max-width: 1400px) {
+  .classroom-monitor-session {
+    .snapshot-grid {
+      grid-template-columns: repeat(3, minmax(0, 1fr));
+    }
+
+    .student-snapshot-list {
+      grid-template-columns: repeat(2, minmax(0, 1fr));
+    }
+  }
+}
+
+@media (max-width: 1080px) {
+  .classroom-monitor-session {
+    .snapshot-grid {
+      grid-template-columns: repeat(2, minmax(0, 1fr));
+    }
+  }
+}
+
+@media (max-width: 768px) {
+  .classroom-monitor-session {
+    .card-header,
+    .snapshot-header {
+      align-items: stretch;
+      flex-direction: column;
+    }
+
+    .header-actions {
+      flex-direction: column;
+    }
+
+    .snapshot-grid {
+      grid-template-columns: 1fr;
+    }
+
+    .student-snapshot-list {
+      grid-template-columns: 1fr;
+    }
+  }
+}
+</style>