diff --git a/apps/taro/src/app.tsx b/apps/taro/src/app.tsx
index 70483456..129af959 100644
--- a/apps/taro/src/app.tsx
+++ b/apps/taro/src/app.tsx
@@ -1,6 +1,7 @@
 import { PropsWithChildren, useEffect, useState } from 'react';
 import { Text, View } from '@tarojs/components';
 import 'katex/dist/katex.min.css';
+import { AdminLegacyShell } from '@/components/AdminLegacyShell';
 import { StudentLegacyShell } from '@/components/StudentLegacyShell';
 import { appEnv, isH5Runtime } from '@/env';
 import { currentPagePath, guardCurrentRoute, shouldGuardPath } from '@/services/routeGuard';
@@ -53,6 +54,12 @@ function shouldUseStudentShell(path: string) {
   ].includes(path);
 }
 
+function shouldUseAdminShell(path: string) {
+  if (appEnv.portal === 'tenant-admin') return path.startsWith('/pages/tenant-admin/');
+  if (appEnv.portal === 'platform-admin') return path.startsWith('/pages/platform-admin/');
+  return false;
+}
+
 export default function App({ children }: PropsWithChildren) {
   const [routeReady, setRouteReady] = useState(() => !shouldGuardPath(currentPagePath()));
   const [path, setPath] = useState(() => currentPagePath());
@@ -118,5 +125,9 @@ export default function App({ children }: PropsWithChildren) {
     return <StudentLegacyShell>{children}</StudentLegacyShell>;
   }
 
+  if (shouldUseAdminShell(path)) {
+    return <AdminLegacyShell>{children}</AdminLegacyShell>;
+  }
+
   return children;
 }
diff --git a/apps/taro/src/components/AdminLegacyShell.css b/apps/taro/src/components/AdminLegacyShell.css
new file mode 100644
index 00000000..cd38efe4
--- /dev/null
+++ b/apps/taro/src/components/AdminLegacyShell.css
@@ -0,0 +1,421 @@
+.backoffice-legacy-layout {
+  min-height: 100vh;
+  background:
+    linear-gradient(to right, rgba(15, 23, 42, 0.035) 1px, transparent 1px),
+    linear-gradient(to bottom, rgba(15, 23, 42, 0.035) 1px, transparent 1px),
+    #f4f6f9;
+  color: #111827;
+}
+
+.backoffice-legacy-main {
+  min-width: 0;
+}
+
+.backoffice-legacy-sidebar {
+  display: none;
+}
+
+.backoffice-mobile-nav {
+  position: sticky;
+  top: 0;
+  z-index: 28;
+  display: flex;
+  gap: 10px;
+  overflow-x: auto;
+  padding: 14px 16px;
+  border-bottom: 1px solid #e5e7eb;
+  background: rgba(255, 255, 255, 0.96);
+  box-shadow: 0 6px 18px rgba(15, 23, 42, 0.06);
+}
+
+.backoffice-mobile-item {
+  display: flex;
+  align-items: center;
+  gap: 7px;
+  flex: 0 0 auto;
+  min-height: 44px;
+  padding: 0 12px;
+  border-radius: 14px;
+  background: #f8fafc;
+  color: #64748b;
+}
+
+.backoffice-mobile-item.active {
+  background: #1e293b;
+  color: #fff;
+  box-shadow: 0 6px 15px rgba(15, 23, 42, 0.18);
+}
+
+.backoffice-mobile-mark {
+  font-size: 18px;
+  font-weight: 900;
+}
+
+.backoffice-mobile-text {
+  font-size: 20px;
+  font-weight: 780;
+  white-space: nowrap;
+}
+
+.backoffice-legacy-main .admin-page,
+.backoffice-legacy-main .platform-page {
+  min-height: auto;
+  padding: 18px;
+  background: transparent;
+}
+
+.backoffice-legacy-main .admin-shell,
+.backoffice-legacy-main .platform-shell {
+  gap: 18px;
+}
+
+.backoffice-legacy-main .admin-header,
+.backoffice-legacy-main .platform-header {
+  border: 1px solid #f1f5f9;
+  border-radius: 18px;
+  background: #fff;
+  box-shadow: 0 1px 3px rgba(15, 23, 42, 0.04);
+}
+
+.backoffice-legacy-main .admin-header::after,
+.backoffice-legacy-main .platform-header::after {
+  display: none;
+}
+
+.backoffice-legacy-main .admin-kicker,
+.backoffice-legacy-main .platform-kicker {
+  color: #2563eb;
+  font-size: 18px;
+  font-weight: 800;
+}
+
+.backoffice-legacy-main .admin-title,
+.backoffice-legacy-main .platform-title {
+  color: #111827;
+  font-size: 33px;
+  font-weight: 900;
+}
+
+.backoffice-legacy-main .admin-subtitle,
+.backoffice-legacy-main .platform-subtitle {
+  color: #64748b;
+  font-size: 21px;
+}
+
+.backoffice-legacy-main .admin-section,
+.backoffice-legacy-main .platform-section,
+.backoffice-legacy-main .admin-metric,
+.backoffice-legacy-main .platform-metric,
+.backoffice-legacy-main .admin-row,
+.backoffice-legacy-main .platform-row {
+  border-color: #f1f5f9;
+  border-radius: 16px;
+  background: #fff;
+  box-shadow: 0 1px 3px rgba(15, 23, 42, 0.04);
+}
+
+.backoffice-legacy-main .admin-section,
+.backoffice-legacy-main .platform-section {
+  padding: 20px;
+}
+
+.backoffice-legacy-main .admin-section-title,
+.backoffice-legacy-main .platform-section-title {
+  margin-bottom: 14px;
+  color: #111827;
+  font-size: 25px;
+  font-weight: 900;
+}
+
+.backoffice-legacy-main .admin-module-card,
+.backoffice-legacy-main .platform-module-card {
+  min-height: 132px;
+  border: 1px solid #f1f5f9;
+  border-radius: 16px;
+  background: #fff;
+  box-shadow: 0 1px 3px rgba(15, 23, 42, 0.04);
+}
+
+.backoffice-legacy-main .admin-module-card::after,
+.backoffice-legacy-main .platform-module-card::after {
+  display: none;
+}
+
+.backoffice-legacy-main .admin-module-label,
+.backoffice-legacy-main .platform-module-label {
+  color: #2563eb;
+  font-size: 17px;
+}
+
+.backoffice-legacy-main .admin-module-card .admin-row-main,
+.backoffice-legacy-main .platform-module-card .platform-row-main {
+  margin-top: 22px;
+  color: #111827;
+  font-size: 27px;
+}
+
+.backoffice-legacy-main .admin-module-card .admin-row-meta,
+.backoffice-legacy-main .platform-module-card .platform-row-meta {
+  color: #64748b;
+}
+
+.backoffice-legacy-main .admin-button,
+.backoffice-legacy-main .platform-button,
+.backoffice-legacy-main .admin-mini-button,
+.backoffice-legacy-main .platform-mini-button {
+  border-radius: 12px;
+}
+
+.backoffice-legacy-main .admin-button.primary,
+.backoffice-legacy-main .platform-button.primary,
+.backoffice-legacy-main .admin-mini-button.primary {
+  border-color: #1e293b;
+  background: #1e293b;
+  box-shadow: 0 6px 14px rgba(15, 23, 42, 0.14);
+}
+
+.backoffice-legacy-main .admin-button.active,
+.backoffice-legacy-main .platform-button.active,
+.backoffice-legacy-main .platform-mini-button.active {
+  border-color: #1e293b;
+  background: #1e293b;
+  color: #fff;
+}
+
+@media (min-width: 980px) {
+  .backoffice-legacy-layout {
+    display: grid;
+    grid-template-columns: 256px minmax(0, 1fr);
+    gap: 16px;
+    padding: 16px;
+  }
+
+  .backoffice-mobile-nav {
+    display: none;
+  }
+
+  .backoffice-legacy-sidebar {
+    position: sticky;
+    top: 16px;
+    display: flex;
+    height: calc(100vh - 32px);
+    flex-direction: column;
+    padding: 16px;
+    border: 1px solid #f1f5f9;
+    border-radius: 24px;
+    background: #fff;
+    box-shadow: 0 8px 30px rgba(15, 23, 42, 0.04);
+  }
+
+  .backoffice-brand {
+    display: flex;
+    align-items: center;
+    gap: 12px;
+    padding: 14px 10px 18px;
+  }
+
+  .backoffice-brand-icon {
+    display: flex;
+    align-items: center;
+    justify-content: center;
+    flex: 0 0 42px;
+    width: 42px;
+    height: 42px;
+    border-radius: 12px;
+    background: #eff6ff;
+    color: #1d4ed8;
+  }
+
+  .backoffice-brand-mark {
+    font-size: 22px;
+    font-weight: 950;
+  }
+
+  .backoffice-brand-copy {
+    min-width: 0;
+  }
+
+  .backoffice-brand-title {
+    display: block;
+    color: #1f2937;
+    font-size: 20px;
+    font-weight: 900;
+    line-height: 1.25;
+  }
+
+  .backoffice-brand-sub {
+    display: block;
+    margin-top: 3px;
+    color: #64748b;
+    font-size: 13px;
+    font-weight: 720;
+    line-height: 1.25;
+  }
+
+  .backoffice-tenant-select {
+    padding: 0 10px 16px;
+  }
+
+  .backoffice-field-label {
+    display: block;
+    margin-bottom: 6px;
+    color: #9ca3af;
+    font-size: 12px;
+    font-weight: 900;
+  }
+
+  .backoffice-select-box {
+    display: flex;
+    align-items: center;
+    min-height: 42px;
+    padding: 0 12px;
+    border: 1px solid #bfdbfe;
+    border-radius: 13px;
+    background: #eff6ff;
+  }
+
+  .backoffice-select-text {
+    color: #1d4ed8;
+    font-size: 16px;
+    font-weight: 900;
+  }
+
+  .backoffice-nav {
+    display: flex;
+    flex: 1;
+    flex-direction: column;
+    gap: 6px;
+    overflow-y: auto;
+    padding-right: 4px;
+  }
+
+  .backoffice-nav-block {
+    display: flex;
+    flex-direction: column;
+    gap: 4px;
+  }
+
+  .backoffice-nav-group {
+    display: block;
+    margin: 10px 0 3px;
+    padding: 0 12px;
+    color: #9ca3af;
+    font-size: 12px;
+    font-weight: 900;
+  }
+
+  .backoffice-nav-btn {
+    display: flex;
+    align-items: center;
+    gap: 12px;
+    min-height: 48px;
+    padding: 0 14px;
+    border-radius: 12px;
+    color: #475569;
+  }
+
+  .backoffice-nav-btn.active {
+    background: #1e293b;
+    color: #fff;
+    box-shadow: 0 4px 12px rgba(15, 23, 42, 0.15);
+  }
+
+  .backoffice-nav-mark {
+    display: flex;
+    align-items: center;
+    justify-content: center;
+    width: 24px;
+    height: 24px;
+    border-radius: 8px;
+    background: #f3f4f6;
+    color: inherit;
+    font-size: 14px;
+    font-weight: 900;
+  }
+
+  .backoffice-nav-btn.active .backoffice-nav-mark {
+    background: rgba(255, 255, 255, 0.14);
+  }
+
+  .backoffice-nav-text {
+    font-size: 16px;
+    font-weight: 860;
+  }
+
+  .backoffice-footer {
+    display: flex;
+    align-items: center;
+    gap: 10px;
+    margin-top: 12px;
+    padding: 14px 10px 4px;
+    border-top: 1px solid #f1f5f9;
+  }
+
+  .backoffice-footer-avatar {
+    display: flex;
+    align-items: center;
+    justify-content: center;
+    flex: 0 0 36px;
+    width: 36px;
+    height: 36px;
+    border-radius: 999px;
+    background: #f1f5f9;
+    color: #475569;
+  }
+
+  .backoffice-footer-mark {
+    font-size: 16px;
+    font-weight: 900;
+  }
+
+  .backoffice-footer-copy {
+    min-width: 0;
+  }
+
+  .backoffice-footer-name {
+    display: block;
+    color: #334155;
+    font-size: 15px;
+    font-weight: 850;
+  }
+
+  .backoffice-footer-meta {
+    display: block;
+    margin-top: 2px;
+    color: #94a3b8;
+    font-size: 12px;
+    font-weight: 720;
+  }
+
+  .backoffice-legacy-main {
+    overflow: hidden;
+    border: 1px solid #f1f5f9;
+    border-radius: 24px;
+    background: #fff;
+    box-shadow: 0 1px 3px rgba(15, 23, 42, 0.04);
+  }
+
+  .backoffice-legacy-main .admin-page,
+  .backoffice-legacy-main .platform-page {
+    max-width: none;
+    margin: 0;
+    padding: 24px;
+  }
+
+  .backoffice-legacy-main .admin-grid,
+  .backoffice-legacy-main .platform-grid {
+    grid-template-columns: repeat(4, minmax(0, 1fr));
+  }
+}
+
+@media (max-width: 520px) {
+  .backoffice-legacy-main .admin-page,
+  .backoffice-legacy-main .platform-page {
+    padding: 16px;
+  }
+
+  .backoffice-legacy-main .admin-title,
+  .backoffice-legacy-main .platform-title {
+    font-size: 30px;
+  }
+}
diff --git a/apps/taro/src/components/AdminLegacyShell.tsx b/apps/taro/src/components/AdminLegacyShell.tsx
new file mode 100644
index 00000000..64a4c6b8
--- /dev/null
+++ b/apps/taro/src/components/AdminLegacyShell.tsx
@@ -0,0 +1,123 @@
+import { PropsWithChildren } from 'react';
+import Taro from '@tarojs/taro';
+import { Text, View } from '@tarojs/components';
+import { appEnv } from '@/env';
+import { currentPagePath } from '@/services/routeGuard';
+import './AdminLegacyShell.css';
+
+type AdminNavItem = {
+  name: string;
+  path: string;
+  mark: string;
+  group?: string;
+};
+
+const tenantNavItems: AdminNavItem[] = [
+  { group: '运营概览', name: '工作台', path: '/pages/tenant-admin/workbench/index', mark: '台' },
+  { name: '数据看板', path: '/pages/tenant-admin/dashboard/index', mark: '数' },
+  { group: '业务管理', name: '学生运营', path: '/pages/tenant-admin/students/index', mark: '生' },
+  { name: '题库内容', path: '/pages/tenant-admin/content/index', mark: '题' },
+  { name: '营销中心', path: '/pages/tenant-admin/marketing/index', mark: '销' },
+  { name: '财务运营', path: '/pages/tenant-admin/finance/index', mark: '财' },
+  { group: '系统', name: '租户设置', path: '/pages/tenant-admin/settings/index', mark: '设' },
+];
+
+const platformNavItems: AdminNavItem[] = [
+  { group: '平台概览', name: '工作台', path: '/pages/platform-admin/workbench/index', mark: '台' },
+  { group: 'SaaS 管理', name: '租户管理', path: '/pages/platform-admin/tenants/index', mark: '租' },
+  { name: '账务中心', path: '/pages/platform-admin/billing/index', mark: '账' },
+  { name: '公共题库', path: '/pages/platform-admin/question-banks/index', mark: '库' },
+  { group: '权限', name: '平台员工', path: '/pages/platform-admin/staff/index', mark: '员' },
+];
+
+function isActivePath(currentPath: string, itemPath: string) {
+  return currentPath === itemPath;
+}
+
+function navItemsForPortal() {
+  return appEnv.portal === 'platform-admin' ? platformNavItems : tenantNavItems;
+}
+
+function titleForPortal() {
+  if (appEnv.portal === 'platform-admin') {
+    return {
+      title: '平台管理后台',
+      subtitle: '租户、账务、题库授权、员工权限',
+      badge: 'Console',
+      mark: '管',
+    };
+  }
+  return {
+    title: '租户运营后台',
+    subtitle: '学生、题库、营销、财务与设置',
+    badge: 'Admin',
+    mark: '题',
+  };
+}
+
+export function AdminLegacyShell({ children }: PropsWithChildren) {
+  const currentPath = currentPagePath();
+  const navItems = navItemsForPortal();
+  const title = titleForPortal();
+  let activeGroup = '';
+
+  return (
+    <View className={`backoffice-legacy-layout ${appEnv.portal === 'platform-admin' ? 'platform-mode' : 'tenant-mode'}`}>
+      <View className='backoffice-legacy-sidebar'>
+        <View className='backoffice-brand'>
+          <View className='backoffice-brand-icon'>
+            <Text className='backoffice-brand-mark'>{title.mark}</Text>
+          </View>
+          <View className='backoffice-brand-copy'>
+            <Text className='backoffice-brand-title'>{title.title}</Text>
+            <Text className='backoffice-brand-sub'>{title.subtitle}</Text>
+          </View>
+        </View>
+
+        <View className='backoffice-tenant-select'>
+          <Text className='backoffice-field-label'>当前后台</Text>
+          <View className='backoffice-select-box'>
+            <Text className='backoffice-select-text'>{title.badge}</Text>
+          </View>
+        </View>
+
+        <View className='backoffice-nav'>
+          {navItems.map(item => {
+            const nextGroup = item.group && item.group !== activeGroup ? item.group : '';
+            if (item.group) activeGroup = item.group;
+            return (
+              <View className='backoffice-nav-block' key={item.path}>
+                {nextGroup ? <Text className='backoffice-nav-group'>{nextGroup}</Text> : null}
+                <View className={`backoffice-nav-btn ${isActivePath(currentPath, item.path) ? 'active' : ''}`} onClick={() => Taro.redirectTo({ url: item.path })}>
+                  <Text className='backoffice-nav-mark'>{item.mark}</Text>
+                  <Text className='backoffice-nav-text'>{item.name}</Text>
+                </View>
+              </View>
+            );
+          })}
+        </View>
+
+        <View className='backoffice-footer'>
+          <View className='backoffice-footer-avatar'>
+            <Text className='backoffice-footer-mark'>管</Text>
+          </View>
+          <View className='backoffice-footer-copy'>
+            <Text className='backoffice-footer-name'>管理账号</Text>
+            <Text className='backoffice-footer-meta'>已启用权限校验</Text>
+          </View>
+        </View>
+      </View>
+
+      <View className='backoffice-mobile-nav'>
+        {navItems.map(item => (
+          <View className={`backoffice-mobile-item ${isActivePath(currentPath, item.path) ? 'active' : ''}`} key={item.path} onClick={() => Taro.redirectTo({ url: item.path })}>
+            <Text className='backoffice-mobile-mark'>{item.mark}</Text>
+            <Text className='backoffice-mobile-text'>{item.name}</Text>
+          </View>
+        ))}
+      </View>
+
+      <View className='backoffice-legacy-main'>{children}</View>
+    </View>
+  );
+}
diff --git a/apps/taro/src/index.html b/apps/taro/src/index.html
index aeb06d7b..7a343498 100644
--- a/apps/taro/src/index.html
+++ b/apps/taro/src/index.html
@@ -14,6 +14,8 @@
   <script>
     (function () {
       var path = window.location.pathname || '';
+      var portal = '<%= process.env.TARO_APP_PORTAL || "student" %>';
+      var redirect = path + (window.location.search || '');
       var publicStudentPaths = {
         '/pages/student/login/index': true,
         '/pages/student/region/index': true,
@@ -21,7 +23,14 @@
         '/pages/student/scoreline/index': true
       };
       if (path.indexOf('/pages/student/') === 0 && !publicStudentPaths[path]) {
-        var redirect = path + (window.location.search || '');
+        window.location.replace('/pages/bootstrap/index?redirect=' + encodeURIComponent(redirect));
+        return;
+      }
+      if (portal === 'tenant-admin' && path.indexOf('/pages/tenant-admin/') === 0) {
+        window.location.replace('/pages/bootstrap/index?redirect=' + encodeURIComponent(redirect));
+        return;
+      }
+      if (portal === 'platform-admin' && path.indexOf('/pages/platform-admin/') === 0) {
         window.location.replace('/pages/bootstrap/index?redirect=' + encodeURIComponent(redirect));
       }
     }());