diff --git a/web/src/components.d.ts b/web/src/components.d.ts
index 4fdc1eb..44bb231 100644
--- a/web/src/components.d.ts
+++ b/web/src/components.d.ts
@@ -31,6 +31,7 @@ declare module 'vue' {
     ElRadioButton: typeof import('element-plus/es')['ElRadioButton']
     ElRadioGroup: typeof import('element-plus/es')['ElRadioGroup']
     ElSelect: typeof import('element-plus/es')['ElSelect']
+    ElSubMenu: typeof import('element-plus/es')['ElSubMenu']
     ElSwitch: typeof import('element-plus/es')['ElSwitch']
     ElTable: typeof import('element-plus/es')['ElTable']
     ElTableColumn: typeof import('element-plus/es')['ElTableColumn']
diff --git a/web/src/layouts/AdminLayout.vue b/web/src/layouts/AdminLayout.vue
index d8dc835..3ace5ce 100644
--- a/web/src/layouts/AdminLayout.vue
+++ b/web/src/layouts/AdminLayout.vue
@@ -1,59 +1,151 @@
 <script setup lang="ts">
 import { computed, onMounted, ref } from 'vue'
 import { useRoute, useRouter } from 'vue-router'
-import {
-  Collection,
-  DataAnalysis,
-  OfficeBuilding,
-  Operation,
-  Reading,
-  Tickets,
-  Calendar,
-  CircleCheck,
-  DocumentChecked,
-  AlarmClock,
-  RefreshRight,
-  Medal,
-  User,
-  UserFilled,
-} from '@element-plus/icons-vue'
+import { Operation } from '@element-plus/icons-vue'
 import { useAuthStore } from '../stores/auth'
 
+interface NavigationItem {
+  path: string
+  label: string
+}
+
+interface NavigationGroup {
+  key: string
+  label: string
+  direct?: boolean
+  items: NavigationItem[]
+}
+
 const route = useRoute()
 const router = useRouter()
 const auth = useAuthStore()
-const collapsed = ref(false)
 const mobileMenu = ref(false)
+
+const roles = computed(() => auth.user?.roles ?? [])
+const isStudent = computed(() => roles.value.includes('Student'))
+const isTeacher = computed(() => roles.value.includes('Teacher'))
+const isTeachingAdmin = computed(() =>
+  roles.value.some((role) => ['SuperAdmin', 'AcademicAdmin', 'CollegeAdmin'].includes(role)),
+)
+
+function hasAnyRole(allowedRoles: string[]) {
+  return roles.value.some((role) => allowedRoles.includes(role))
+}
+
+function whenVisible(visible: boolean, item: NavigationItem) {
+  return visible ? [item] : []
+}
+
+const navigationGroups = computed<NavigationGroup[]>(() => [
+  {
+    key: 'overview',
+    label: '教务总览',
+    direct: true,
+    items: [{ path: '/dashboard', label: '教务总览' }],
+  },
+  {
+    key: 'organization',
+    label: '组织与权限',
+    items: [
+      ...whenVisible(
+        hasAnyRole(['SuperAdmin', 'AcademicAdmin']),
+        { path: '/base-data', label: '基础数据' },
+      ),
+      ...whenVisible(
+        hasAnyRole(['SuperAdmin', 'AcademicAdmin', 'CollegeAdmin', 'Counselor']),
+        { path: '/personnel', label: '人员档案' },
+      ),
+      ...whenVisible(auth.isSuperAdmin, { path: '/users', label: '用户与权限' }),
+    ],
+  },
+  {
+    key: 'teaching-construction',
+    label: '教学建设',
+    items: [
+      { path: '/courses', label: '课程库' },
+      ...whenVisible(isTeachingAdmin.value, { path: '/curriculum', label: '培养方案' }),
+      ...whenVisible(isTeachingAdmin.value, { path: '/teaching-tasks', label: '教学任务' }),
+      ...whenVisible(
+        hasAnyRole(['SuperAdmin', 'AcademicAdmin']),
+        { path: '/schedules', label: '排课与课表' },
+      ),
+    ],
+  },
+  {
+    key: 'teaching-operation',
+    label: '教学运行',
+    items: [
+      ...whenVisible(
+        hasAnyRole(['SuperAdmin', 'AcademicAdmin', 'CollegeAdmin', 'Student']),
+        {
+          path: '/course-selections',
+          label: isTeachingAdmin.value ? '选课管理' : '学生选课',
+        },
+      ),
+      ...whenVisible(
+        hasAnyRole(['SuperAdmin', 'AcademicAdmin', 'CollegeAdmin', 'Teacher', 'Student']),
+        { path: '/grades', label: isStudent.value ? '学业成绩' : '成绩管理' },
+      ),
+      ...whenVisible(
+        hasAnyRole(['SuperAdmin', 'AcademicAdmin', 'Teacher', 'Student']),
+        {
+          path: '/exams',
+          label: isStudent.value ? '我的考试' : isTeacher.value ? '我的监考' : '考试管理',
+        },
+      ),
+    ],
+  },
+  {
+    key: 'student-status',
+    label: '学籍管理',
+    items: [
+      ...whenVisible(
+        hasAnyRole(['SuperAdmin', 'AcademicAdmin', 'CollegeAdmin', 'Counselor', 'Student']),
+        { path: '/student-status-changes', label: isStudent.value ? '学籍异动' : '异动审核' },
+      ),
+    ],
+  },
+  {
+    key: 'graduation',
+    label: '毕业管理',
+    items: [
+      ...whenVisible(
+        hasAnyRole(['SuperAdmin', 'AcademicAdmin', 'CollegeAdmin', 'Student']),
+        { path: '/graduation-audits', label: isStudent.value ? '毕业资格' : '毕业审核' },
+      ),
+      ...whenVisible(
+        hasAnyRole(['SuperAdmin', 'AcademicAdmin', 'CollegeAdmin', 'Student']),
+        { path: '/degree-awards', label: isStudent.value ? '学位结果' : '学位授予' },
+      ),
+      ...whenVisible(
+        hasAnyRole(['SuperAdmin', 'AcademicAdmin', 'CollegeAdmin', 'Counselor', 'Student']),
+        { path: '/graduation-clearance', label: isStudent.value ? '毕业离校' : '离校办理' },
+      ),
+    ],
+  },
+].filter((group) => group.items.length > 0))
+
+const activeGroupKey = computed(
+  () => navigationGroups.value.find((group) =>
+    group.items.some((item) => item.path === route.path),
+  )?.key ?? '',
+)
+
 const workspaceLabel = computed(() => {
-  const roles = auth.user?.roles ?? []
-  if (roles.includes('SuperAdmin')) return '系统全域管理'
-  if (roles.includes('AcademicAdmin')) return '校级教务管理'
-  if (roles.includes('CollegeAdmin')) return '学院教务管理'
-  if (roles.includes('Counselor')) return '辅导员班级工作'
-  if (roles.includes('Teacher')) return '教师教学工作'
-  if (roles.includes('Student')) return '学生学业服务'
+  if (roles.value.includes('SuperAdmin')) return '系统全域管理'
+  if (roles.value.includes('AcademicAdmin')) return '校级教务管理'
+  if (roles.value.includes('CollegeAdmin')) return '学院教务管理'
+  if (roles.value.includes('Counselor')) return '辅导员班级工作'
+  if (roles.value.includes('Teacher')) return '教师教学工作'
+  if (roles.value.includes('Student')) return '学生学业服务'
   return '教务工作台'
 })
 
 const pageTitle = computed(() => {
-  const titles: Record<string, string> = {
-    dashboard: '教务总览',
-    'base-data': '基础数据',
-    personnel: '人员档案',
-    courses: '课程库',
-    curriculum: '培养方案',
-    'teaching-tasks': '教学任务',
-    schedules: '排课与课表',
-    'course-selections': '选课与教学班',
-    grades: '成绩与学业档案',
-    exams: '考试与考场',
-    'student-status-changes': '学籍异动',
-    'graduation-audits': '毕业资格审核',
-    'degree-awards': '学位授予审核',
-    'graduation-clearance': '毕业离校办理',
-    users: '用户与权限',
-  }
-  return titles[String(route.name)] ?? '教务管理'
+  const matchedItem = navigationGroups.value
+    .flatMap((group) => group.items)
+    .find((item) => item.path === route.path)
+  return matchedItem?.label ?? '教务管理'
 })
 
 function signOut() {
@@ -65,148 +157,33 @@ onMounted(() => auth.refresh().catch(() => undefined))
 </script>
 
 <template>
-  <div class="shell" :class="{ 'is-collapsed': collapsed }">
-    <aside class="sidebar" :class="{ 'is-mobile-open': mobileMenu }">
-      <div class="brand">
-        <div class="brand-mark" aria-hidden="true">
-          <span v-for="index in 9" :key="index" />
-        </div>
-        <div v-if="!collapsed">
-          <strong>明序教务</strong>
-          <small>ACADEMIC OFFICE</small>
-        </div>
-      </div>
-
-      <div v-if="!collapsed" class="term-stamp">
-        <span>当前工作区</span>
-        <b>{{ workspaceLabel }}</b>
-      </div>
-
-      <el-menu
-        router
-        :default-active="route.path"
-        :collapse="collapsed"
-        class="nav-menu"
-        @select="mobileMenu = false"
-      >
-        <el-menu-item index="/dashboard">
-          <el-icon><DataAnalysis /></el-icon>
-          <template #title>教务总览</template>
-        </el-menu-item>
-        <el-menu-item
-          v-if="auth.user?.roles.some((role) => ['SuperAdmin', 'AcademicAdmin'].includes(role))"
-          index="/base-data"
+  <div class="shell">
+    <header class="app-header">
+      <div class="topbar">
+        <button
+          class="menu-toggle mobile-only"
+          type="button"
+          aria-label="打开导航菜单"
+          @click="mobileMenu = true"
         >
-          <el-icon><OfficeBuilding /></el-icon>
-          <template #title>基础数据</template>
-        </el-menu-item>
-        <el-menu-item
-          v-if="auth.user?.roles.some((role) => ['SuperAdmin', 'AcademicAdmin', 'CollegeAdmin', 'Counselor'].includes(role))"
-          index="/personnel"
-        >
-          <el-icon><UserFilled /></el-icon>
-          <template #title>人员档案</template>
-        </el-menu-item>
-        <el-menu-item index="/courses">
-          <el-icon><Collection /></el-icon>
-          <template #title>课程库</template>
-        </el-menu-item>
-        <el-menu-item
-          v-if="auth.user?.roles.some((role) => ['SuperAdmin', 'AcademicAdmin', 'CollegeAdmin'].includes(role))"
-          index="/curriculum"
-        >
-          <el-icon><Reading /></el-icon>
-          <template #title>培养方案</template>
-        </el-menu-item>
-        <el-menu-item
-          v-if="auth.user?.roles.some((role) => ['SuperAdmin', 'AcademicAdmin', 'CollegeAdmin'].includes(role))"
-          index="/teaching-tasks"
-        >
-          <el-icon><Tickets /></el-icon>
-          <template #title>教学任务</template>
-        </el-menu-item>
-        <el-menu-item
-          v-if="auth.user?.roles.some((role) => ['SuperAdmin', 'AcademicAdmin'].includes(role))"
-          index="/schedules"
-        >
-          <el-icon><Calendar /></el-icon>
-          <template #title>排课与课表</template>
-        </el-menu-item>
-        <el-menu-item
-          v-if="auth.user?.roles.some((role) => ['SuperAdmin', 'AcademicAdmin', 'CollegeAdmin', 'Student'].includes(role))"
-          index="/course-selections"
-        >
-          <el-icon><CircleCheck /></el-icon>
-          <template #title>{{ auth.user?.roles.some((role) => ['SuperAdmin', 'AcademicAdmin', 'CollegeAdmin'].includes(role)) ? '选课管理' : '学生选课' }}</template>
-        </el-menu-item>
-        <el-menu-item
-          v-if="auth.user?.roles.some((role) => ['SuperAdmin', 'AcademicAdmin', 'CollegeAdmin', 'Teacher', 'Student'].includes(role))"
-          index="/grades"
-        >
-          <el-icon><DocumentChecked /></el-icon>
-          <template #title>{{ auth.user?.roles.includes('Student') ? '学业成绩' : '成绩管理' }}</template>
-        </el-menu-item>
-        <el-menu-item
-          v-if="auth.user?.roles.some((role) => ['SuperAdmin', 'AcademicAdmin', 'Teacher', 'Student'].includes(role))"
-          index="/exams"
-        >
-          <el-icon><AlarmClock /></el-icon>
-          <template #title>{{ auth.user?.roles.includes('Student') ? '我的考试' : auth.user?.roles.includes('Teacher') ? '我的监考' : '考试管理' }}</template>
-        </el-menu-item>
-        <el-menu-item
-          v-if="auth.user?.roles.some((role) => ['SuperAdmin', 'AcademicAdmin', 'CollegeAdmin', 'Counselor', 'Student'].includes(role))"
-          index="/student-status-changes"
-        >
-          <el-icon><RefreshRight /></el-icon>
-          <template #title>{{ auth.user?.roles.includes('Student') ? '学籍异动' : '异动审核' }}</template>
-        </el-menu-item>
-        <el-menu-item
-          v-if="auth.user?.roles.some((role) => ['SuperAdmin', 'AcademicAdmin', 'CollegeAdmin', 'Student'].includes(role))"
-          index="/graduation-audits"
-        >
-          <el-icon><Medal /></el-icon>
-          <template #title>{{ auth.user?.roles.includes('Student') ? '毕业资格' : '毕业审核' }}</template>
-        </el-menu-item>
-        <el-menu-item
-          v-if="auth.user?.roles.some((role) => ['SuperAdmin', 'AcademicAdmin', 'CollegeAdmin', 'Student'].includes(role))"
-          index="/degree-awards"
-        >
-          <el-icon><Medal /></el-icon>
-          <template #title>{{ auth.user?.roles.includes('Student') ? '学位结果' : '学位授予' }}</template>
-        </el-menu-item>
-        <el-menu-item
-          v-if="auth.user?.roles.some((role) => ['SuperAdmin', 'AcademicAdmin', 'CollegeAdmin', 'Counselor', 'Student'].includes(role))"
-          index="/graduation-clearance"
-        >
-          <el-icon><CircleCheck /></el-icon>
-          <template #title>{{ auth.user?.roles.includes('Student') ? '毕业离校' : '离校办理' }}</template>
-        </el-menu-item>
-        <el-menu-item v-if="auth.isSuperAdmin" index="/users">
-          <el-icon><User /></el-icon>
-          <template #title>用户与权限</template>
-        </el-menu-item>
-      </el-menu>
-
-      <div v-if="!collapsed" class="phase-note">
-        <span>第一阶段 · 核心可用版</span>
-        <p>教学运行、学籍与毕业审核已就绪</p>
-      </div>
-    </aside>
-
-    <div v-if="mobileMenu" class="mobile-mask" @click="mobileMenu = false" />
-
-    <main class="main-area">
-      <header class="topbar">
-        <button class="menu-toggle desktop-only" type="button" @click="collapsed = !collapsed">
           <el-icon><Operation /></el-icon>
         </button>
-        <button class="menu-toggle mobile-only" type="button" @click="mobileMenu = true">
-          <el-icon><Operation /></el-icon>
-        </button>
-        <div class="page-heading">
-          <span>教务工作台</span>
-          <h1>{{ pageTitle }}</h1>
+
+        <div class="brand top-brand">
+          <div class="brand-mark" aria-hidden="true">
+            <span v-for="index in 9" :key="index" />
+          </div>
+          <div>
+            <strong>明序教务</strong>
+            <small>ACADEMIC OFFICE</small>
+          </div>
         </div>
+
+        <div class="workspace-context">
+          <span>{{ workspaceLabel }}</span>
+          <b>{{ pageTitle }}</b>
+        </div>
+
         <div class="user-block">
           <div class="avatar">{{ auth.user?.displayName?.slice(0, 1) ?? '管' }}</div>
           <div class="user-copy">
@@ -215,7 +192,93 @@ onMounted(() => auth.refresh().catch(() => undefined))
           </div>
           <el-button text @click="signOut">退出</el-button>
         </div>
-      </header>
+      </div>
+
+      <nav class="desktop-navigation desktop-only" aria-label="主导航">
+        <el-menu
+          router
+          mode="horizontal"
+          menu-trigger="click"
+          :default-active="route.path"
+          :ellipsis="false"
+          class="horizontal-menu"
+        >
+          <template v-for="group in navigationGroups" :key="group.key">
+            <el-menu-item v-if="group.direct" :index="group.items[0].path">
+              {{ group.label }}
+            </el-menu-item>
+            <el-sub-menu v-else :index="group.key">
+              <template #title>{{ group.label }}</template>
+              <el-menu-item
+                v-for="item in group.items"
+                :key="item.path"
+                :index="item.path"
+              >
+                {{ item.label }}
+              </el-menu-item>
+            </el-sub-menu>
+          </template>
+        </el-menu>
+        <div class="navigation-status">
+          <span>CORE SYSTEM</span>
+          <b>核心业务已就绪</b>
+        </div>
+      </nav>
+    </header>
+
+    <aside class="mobile-navigation" :class="{ 'is-mobile-open': mobileMenu }">
+      <div class="mobile-navigation-head">
+        <div class="brand">
+          <div class="brand-mark" aria-hidden="true">
+            <span v-for="index in 9" :key="index" />
+          </div>
+          <div>
+            <strong>明序教务</strong>
+            <small>ACADEMIC OFFICE</small>
+          </div>
+        </div>
+        <button type="button" aria-label="关闭导航菜单" @click="mobileMenu = false">×</button>
+      </div>
+
+      <div class="term-stamp">
+        <span>当前工作区</span>
+        <b>{{ workspaceLabel }}</b>
+      </div>
+
+      <el-menu
+        router
+        :default-active="route.path"
+        :default-openeds="activeGroupKey ? [activeGroupKey] : []"
+        unique-opened
+        class="mobile-nav-menu"
+        @select="mobileMenu = false"
+      >
+        <template v-for="group in navigationGroups" :key="group.key">
+          <el-menu-item v-if="group.direct" :index="group.items[0].path">
+            {{ group.label }}
+          </el-menu-item>
+          <el-sub-menu v-else :index="group.key">
+            <template #title>{{ group.label }}</template>
+            <el-menu-item
+              v-for="item in group.items"
+              :key="item.path"
+              :index="item.path"
+            >
+              {{ item.label }}
+            </el-menu-item>
+          </el-sub-menu>
+        </template>
+      </el-menu>
+
+      <div class="phase-note">
+        <span>第一阶段 · 核心可用版</span>
+        <p>教学运行、学籍与毕业审核已就绪</p>
+      </div>
+    </aside>
+
+    <div v-if="mobileMenu" class="mobile-mask" @click="mobileMenu = false" />
+
+    <main class="main-area">
       <section class="content">
         <RouterView />
       </section>
diff --git a/web/src/style.css b/web/src/style.css
index 1e76705..ac88ef0 100644
--- a/web/src/style.css
+++ b/web/src/style.css
@@ -24,49 +24,112 @@ button, input, textarea, select { font: inherit; }
 button { cursor: pointer; }
 #app { min-height: 100vh; }
 
-.shell { min-height: 100vh; display: grid; grid-template-columns: 256px 1fr; transition: grid-template-columns .2s ease; }
-.shell.is-collapsed { grid-template-columns: 72px 1fr; }
-.sidebar {
-  position: fixed; inset: 0 auto 0 0; width: 256px; z-index: 20; overflow: hidden;
-  display: flex; flex-direction: column; color: #eef2ff;
-  background:
-    linear-gradient(rgba(255,255,255,.025) 1px, transparent 1px),
-    linear-gradient(90deg, rgba(255,255,255,.025) 1px, transparent 1px),
-    var(--indigo-deep);
-  background-size: 26px 26px;
-  transition: width .2s ease, transform .25s ease;
+.shell { min-height: 100vh; }
+.app-header {
+  position: sticky; top: 0; z-index: 20;
+  box-shadow: 0 5px 18px rgba(19,34,73,.08);
 }
-.is-collapsed .sidebar { width: 72px; }
-.brand { height: 86px; padding: 0 24px; display: flex; align-items: center; gap: 13px; border-bottom: 1px solid rgba(255,255,255,.1); white-space: nowrap; }
-.is-collapsed .brand { padding: 0 17px; }
+.topbar {
+  height: 70px; padding: 0 32px; display: flex; align-items: center; gap: 24px;
+  color: white; background:
+    linear-gradient(90deg, rgba(255,255,255,.025) 1px, transparent 1px),
+    linear-gradient(112deg, #152550 0%, #1d326c 72%, #176a70 130%);
+  background-size: 28px 28px, auto;
+}
+.brand {
+  height: 70px; display: flex; align-items: center; gap: 13px;
+  white-space: nowrap;
+}
+.top-brand { min-width: 224px; padding-right: 28px; border-right: 1px solid rgba(255,255,255,.14); }
 .brand strong { display: block; font-family: "STZhongsong", "Songti SC", serif; font-size: 21px; letter-spacing: .12em; color: white; }
 .brand small { display: block; margin-top: 3px; font: 9px/1.2 Consolas, monospace; letter-spacing: .16em; color: #9faad1; }
 .brand-mark { flex: 0 0 auto; width: 31px; height: 31px; display: grid; grid-template-columns: repeat(3,1fr); gap: 3px; }
 .brand-mark span { border: 1px solid #9eabd8; }
 .brand-mark span:nth-child(2), .brand-mark span:nth-child(5), .brand-mark span:nth-child(8) { background: #3ec1ae; border-color: #3ec1ae; }
 .brand-mark.large { width: 42px; height: 42px; gap: 4px; }
+.workspace-context { min-width: 180px; display: grid; gap: 4px; }
+.workspace-context span { color: #aeb9d8; font-size: 10px; letter-spacing: .08em; }
+.workspace-context b { font-size: 14px; font-weight: 550; letter-spacing: .04em; }
+.user-block { margin-left: auto; display: flex; align-items: center; gap: 11px; }
+.avatar { width: 36px; height: 36px; display: grid; place-items: center; border-radius: 50%; color: #123b3e; background: #59d3c1; font-weight: 750; }
+.user-copy b, .user-copy span { display: block; }
+.user-copy b { color: white; font-size: 13px; }
+.user-copy span { margin-top: 3px; color: #aeb9d8; font-size: 10px; }
+.topbar .user-block .el-button { color: #d4daf0; }
+.topbar .user-block .el-button:hover { color: white; background: rgba(255,255,255,.08); }
+.desktop-navigation {
+  height: 51px; padding: 0 32px; display: flex; align-items: stretch;
+  border-bottom: 1px solid var(--line); background: rgba(255,255,255,.98);
+}
+.horizontal-menu.el-menu {
+  flex: 1; min-width: 0; height: 50px; border-bottom: none;
+  background: transparent;
+}
+.horizontal-menu.el-menu--horizontal > .el-menu-item,
+.horizontal-menu.el-menu--horizontal > .el-sub-menu .el-sub-menu__title {
+  height: 50px; padding: 0 20px; border-bottom: 3px solid transparent;
+  color: #333d50; font-size: 13px;
+}
+.horizontal-menu.el-menu--horizontal > .el-menu-item:hover,
+.horizontal-menu.el-menu--horizontal > .el-sub-menu .el-sub-menu__title:hover {
+  color: var(--indigo); background: #f6f8fb;
+}
+.horizontal-menu.el-menu--horizontal > .el-menu-item.is-active,
+.horizontal-menu.el-menu--horizontal > .el-sub-menu.is-active .el-sub-menu__title {
+  color: var(--indigo); border-bottom-color: var(--teal);
+  background: linear-gradient(180deg, #fff, #f5faf9);
+  font-weight: 650;
+}
+.horizontal-menu .el-sub-menu__icon-arrow { margin-left: 6px; }
+.navigation-status {
+  flex: 0 0 auto; min-width: 152px; padding-left: 24px;
+  display: grid; align-content: center; gap: 2px;
+  border-left: 1px solid var(--line);
+}
+.navigation-status span { color: var(--teal); font: 700 8px/1.2 Consolas, monospace; letter-spacing: .13em; }
+.navigation-status b { color: #677083; font-size: 10px; font-weight: 500; }
+.mobile-navigation {
+  position: fixed; inset: 0 auto 0 0; z-index: 30; width: 286px;
+  display: flex; flex-direction: column; overflow-y: auto;
+  color: #eef2ff; background:
+    linear-gradient(rgba(255,255,255,.025) 1px, transparent 1px),
+    linear-gradient(90deg, rgba(255,255,255,.025) 1px, transparent 1px),
+    var(--indigo-deep);
+  background-size: 26px 26px;
+  transform: translateX(-100%); transition: transform .25s ease;
+}
+.mobile-navigation.is-mobile-open { transform: translateX(0); }
+.mobile-navigation-head {
+  min-height: 70px; padding: 0 18px 0 20px; display: flex; align-items: center;
+  justify-content: space-between; border-bottom: 1px solid rgba(255,255,255,.1);
+}
+.mobile-navigation-head button {
+  width: 34px; height: 34px; border: 1px solid rgba(255,255,255,.17);
+  border-radius: 6px; color: #cbd3ea; background: rgba(255,255,255,.05);
+  font-size: 23px; line-height: 1;
+}
 .term-stamp { margin: 24px 20px 11px; padding: 13px 15px; border-left: 2px solid #d89b42; background: rgba(255,255,255,.06); }
 .term-stamp span { display: block; font-size: 11px; color: #aab3d4; }
 .term-stamp b { display: block; margin-top: 5px; font-size: 13px; font-weight: 500; color: white; }
-.nav-menu.el-menu { border: none; background: transparent; padding: 8px 10px; }
-.nav-menu .el-menu-item { height: 48px; margin: 4px 0; border-radius: 7px; color: #bbc4e2; }
-.nav-menu .el-menu-item:hover { color: white; background: rgba(255,255,255,.07); }
-.nav-menu .el-menu-item.is-active { color: white; background: #2d478d; box-shadow: inset 3px 0 #46c6b5; }
-.nav-menu .el-icon { font-size: 18px; }
+.mobile-nav-menu.el-menu { border: none; background: transparent; padding: 8px 10px; }
+.mobile-nav-menu .el-menu-item,
+.mobile-nav-menu .el-sub-menu__title {
+  height: 45px; margin: 2px 0; border-radius: 6px; color: #bbc4e2; background: transparent;
+}
+.mobile-nav-menu .el-menu-item:hover,
+.mobile-nav-menu .el-sub-menu__title:hover { color: white; background: rgba(255,255,255,.07); }
+.mobile-nav-menu .el-menu-item.is-active { color: white; background: #2d478d; box-shadow: inset 3px 0 #46c6b5; }
+.mobile-nav-menu .el-sub-menu .el-menu { background: rgba(0,0,0,.1); }
+.mobile-nav-menu .el-sub-menu .el-menu-item { min-width: 0; padding-left: 40px !important; font-size: 12px; }
 .phase-note { margin: auto 20px 24px; padding-top: 17px; border-top: 1px solid rgba(255,255,255,.12); }
 .phase-note span { color: #45c6b5; font-size: 11px; font-weight: 700; letter-spacing: .06em; }
 .phase-note p { margin: 7px 0 0; color: #9faad0; font-size: 12px; line-height: 1.6; }
 
-.main-area { grid-column: 2; min-width: 0; }
-.topbar { height: 86px; padding: 0 32px; display: flex; align-items: center; gap: 20px; background: rgba(255,255,255,.96); border-bottom: 1px solid var(--line); position: sticky; top: 0; z-index: 10; backdrop-filter: blur(10px); }
-.menu-toggle { width: 38px; height: 38px; border: 1px solid var(--line); border-radius: 7px; color: var(--indigo); background: white; }
-.page-heading span { display: block; color: #9aa1af; font-size: 10px; letter-spacing: .14em; text-transform: uppercase; }
-.page-heading h1 { margin: 3px 0 0; font-size: 20px; font-weight: 650; letter-spacing: .04em; }
-.user-block { margin-left: auto; display: flex; align-items: center; gap: 11px; }
-.avatar { width: 38px; height: 38px; display: grid; place-items: center; border-radius: 50%; color: white; background: var(--teal); font-weight: 700; }
-.user-copy b, .user-copy span { display: block; }
-.user-copy b { font-size: 13px; }
-.user-copy span { margin-top: 3px; color: var(--muted); font-size: 11px; }
+.main-area { min-width: 0; }
+.menu-toggle {
+  width: 38px; height: 38px; border: 1px solid rgba(255,255,255,.18);
+  border-radius: 7px; color: white; background: rgba(255,255,255,.07);
+}
 .content { padding: 28px 32px 48px; max-width: 1540px; margin: 0 auto; }
 .mobile-only { display: none; }
 
@@ -795,15 +858,20 @@ button { cursor: pointer; }
 }
 
 @media (max-width: 980px) {
-  .shell, .shell.is-collapsed { display: block; }
-  .sidebar, .is-collapsed .sidebar { width: 256px; transform: translateX(-100%); }
-  .sidebar.is-mobile-open { transform: translateX(0); }
+  .app-header { box-shadow: 0 3px 14px rgba(19,34,73,.1); }
   .main-area { width: 100%; }
-  .mobile-mask { position: fixed; inset: 0; z-index: 15; background: rgba(13,24,48,.45); }
+  .mobile-mask { position: fixed; inset: 0; z-index: 25; background: rgba(13,24,48,.52); }
   .desktop-only { display: none; }
   .mobile-only { display: inline-grid; place-items: center; }
-  .topbar { height: 72px; padding: 0 16px; }
+  .topbar { height: 66px; padding: 0 16px; gap: 13px; }
+  .top-brand { min-width: 0; padding-right: 0; border-right: none; }
+  .top-brand .brand-mark { width: 27px; height: 27px; }
+  .top-brand strong { font-size: 17px; }
+  .top-brand small { display: none; }
+  .workspace-context { display: none; }
   .user-copy { display: none; }
+  .avatar { width: 32px; height: 32px; font-size: 12px; }
+  .topbar .user-block { gap: 4px; }
   .content { padding: 18px 14px 35px; }
   .term-hero { min-height: 220px; padding: 25px; flex-direction: column; align-items: flex-start; justify-content: flex-end; }
   .term-hero button { margin: 22px 0 0; width: 100%; }