diff --git a/CHANGELOG.md b/CHANGELOG.md
index 6f9338b..4c6d38c 100644
--- a/CHANGELOG.md
+++ b/CHANGELOG.md
@@ -1,5 +1,9 @@
 # 更新记录
 
+## 未发布
+
+- 修复管理后台手机端成功/错误提示遮挡顶部导航的问题：窄屏提示改为底部显示，桌面保留右上角，并支持手动关闭。新增提示显示期间的窄屏导航回归测试，覆盖 320/390px 与 100%/150% 字号。
+
 ## v0.3.4 — 2026-11-04
 
 - 文字通知默认不朗读，只在大屏上显示；朗读次数可选 0–3 遍。原声通知播放 1–3 遍。大屏需升级到本版本，旧版大屏收到 0 遍时仍会朗读一遍。
diff --git a/tests/e2e/admin-layout.spec.ts b/tests/e2e/admin-layout.spec.ts
index 6bd7e2d..0dbb8fa 100644
--- a/tests/e2e/admin-layout.spec.ts
+++ b/tests/e2e/admin-layout.spec.ts
@@ -10,12 +10,19 @@ const administrator = {
   status: 'active',
 };
 
-async function mockAdmin(page: Page, siteName = settings.site_name, icpNumber = settings.icp_number) {
+async function mockAdmin(
+  page: Page,
+  siteName = settings.site_name,
+  icpNumber = settings.icp_number,
+  uiScale = 100,
+) {
   const siteSettings = { ...settings, site_name: siteName, icp_number: icpNumber };
   const responses: Record<string, unknown> = {
     '/api/v1/config': siteSettings,
-    '/api/v1/auth/refresh': { access_token: 'test-token', user: administrator },
+    '/api/v1/auth/refresh': { access_token: 'test-token', user: { ...administrator, ui_scale: uiScale } },
     '/api/v1/admin/settings': siteSettings,
+    '/api/v1/admin/schools': [],
+    '/api/v1/admin/classes': [],
     '/api/v1/admin/users': [
       {
         id: 'teacher-1',
@@ -49,6 +56,38 @@ async function mockAdmin(page: Page, siteName = settings.site_name, icpNumber =
   });
 }
 
+test('管理员成功提示显示时窄屏导航仍可点击', async ({ page }) => {
+  for (const width of [320, 390]) {
+    for (const scale of [100, 150]) {
+      await mockAdmin(page, settings.site_name, settings.icp_number, scale);
+      await page.route('**/api/v1/admin/schools', (route) =>
+        route.fulfill({
+          json: route.request().method() === 'POST' ? { id: 'school-toast', name: '提示验收学校' } : [],
+        }),
+      );
+      await page.setViewportSize({ width, height: 844 });
+      await page.goto(adminURL + 'schools');
+      await page.getByRole('button', { name: '新建学校' }).click();
+      const dialog = page.getByRole('dialog');
+      await dialog.getByLabel('学校名称').fill('提示验收学校');
+      await dialog.getByRole('button', { name: '创建学校' }).click();
+      await expect(dialog).toBeHidden();
+      const toast = page.locator('[data-sonner-toast]').filter({ hasText: '学校已创建' });
+      await expect(toast).toBeVisible();
+      // Hold the real toast open instead of waiting for it to expire or forcing the click.
+      await toast.hover();
+      const navigation = page.getByRole('navigation', { name: '管理后台导航' });
+      const toastBox = await toast.boundingBox();
+      const navigationBox = await navigation.boundingBox();
+      expect(toastBox!.y).toBeGreaterThan(navigationBox!.y + navigationBox!.height);
+      await navigation.getByRole('link', { name: '班级管理' }).click({ timeout: 2000 });
+      await expect(page.getByRole('heading', { name: '班级管理', exact: true })).toBeVisible();
+      await expect(toast).toBeVisible();
+      await noOverflow(page);
+    }
+  }
+});
+
 async function noOverflow(page: Page) {
   expect(await page.evaluate(() => document.documentElement.scrollWidth <= innerWidth + 1)).toBe(true);
 }
diff --git a/web/apps/admin/src/main.tsx b/web/apps/admin/src/main.tsx
index 42c6b09..d204876 100644
--- a/web/apps/admin/src/main.tsx
+++ b/web/apps/admin/src/main.tsx
@@ -5,6 +5,7 @@ import { setAuthScope } from '@classding/api';
 import { SiteSettingsProvider } from '@classding/ui/components/classding';
 import { Toaster } from '@classding/ui/components/ui/sonner';
 import { TooltipProvider } from '@classding/ui/components/ui/tooltip';
+import { useIsMobile } from '@classding/ui/hooks/use-mobile';
 import '@classding/ui/globals.css';
 import App from './App';
 
@@ -13,13 +14,19 @@ const queryClient = new QueryClient({
   defaultOptions: { queries: { retry: 1, refetchOnWindowFocus: false, staleTime: 15_000 } },
 });
 
+function AdminToaster() {
+  const isMobile = useIsMobile();
+  // Keep success/error feedback clear of the narrow-screen header and navigation.
+  return <Toaster position={isMobile ? 'bottom-center' : 'top-right'} richColors closeButton />;
+}
+
 createRoot(document.getElementById('root')!).render(
   <SiteSettingsProvider>
     <QueryClientProvider client={queryClient}>
       <TooltipProvider>
         <BrowserRouter basename="/admin">
           <App />
-          <Toaster position="top-right" richColors />
+          <AdminToaster />
         </BrowserRouter>
       </TooltipProvider>
     </QueryClientProvider>