From 254c8f31057070d0a20bf28e24bc65b977ab726e Mon Sep 17 00:00:00 2001
From: root <root@localhost.localdomain>
Date: Wed, 19 Aug 2026 10:43:04 +0800
Subject: [PATCH] =?utf8?q?feat:=20=E9=A1=B5=E9=9D=A2=E5=BA=95=E9=83=A8?=
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---
 frontend/src/App.js                | 33 +++++++++++++++++-------------
 frontend/src/components/Footer.css | 18 ++++++++++++++++
 frontend/src/components/Footer.js  | 13 ++++++++++++
 frontend/src/components/Login.css  |  2 +-
 frontend/src/index.css             |  7 +++++++
 5 files changed, 58 insertions(+), 15 deletions(-)
 create mode 100644 frontend/src/components/Footer.css
 create mode 100644 frontend/src/components/Footer.js

diff --git a/frontend/src/App.js b/frontend/src/App.js
index eac1cdc..d17f71d 100644
--- a/frontend/src/App.js
+++ b/frontend/src/App.js
@@ -7,25 +7,30 @@ import GroupView from './components/GroupView';
 import StudyCalendar from './components/StudyCalendar';
 import SyncNotifications from './components/SyncNotifications';
 import Login from './components/Login';
+import Footer from './components/Footer';
 import { isLoggedIn } from './auth';
 
 function App() {
     const [loggedIn, setLoggedIn] = useState(isLoggedIn());
-    // 未登录：只显示登录页，应用其余部分完全不加载
-    if (!loggedIn) {
-        return <Login onLogin={() => setLoggedIn(true)} />;
-    }
     return (
-        <Router>
-            <SyncNotifications />
-            <Routes>
-                <Route path="/" element={<Home />} />
-                <Route path="/study/:groupId" element={<StudyMode />} />
-                <Route path="/test/:groupId" element={<TestMode />} />
-                <Route path="/group/:groupId" element={<GroupView />} />
-                <Route path="/calendar" element={<StudyCalendar />} />
-            </Routes>
-        </Router>
+        <div className="app-shell">
+            {loggedIn ? (
+                <Router>
+                    <SyncNotifications />
+                    <Routes>
+                        <Route path="/" element={<Home />} />
+                        <Route path="/study/:groupId" element={<StudyMode />} />
+                        <Route path="/test/:groupId" element={<TestMode />} />
+                        <Route path="/group/:groupId" element={<GroupView />} />
+                        <Route path="/calendar" element={<StudyCalendar />} />
+                    </Routes>
+                </Router>
+            ) : (
+                // 未登录：只显示登录页，应用其余部分完全不加载
+                <Login onLogin={() => setLoggedIn(true)} />
+            )}
+            <Footer />
+        </div>
     );
 }
 
diff --git a/frontend/src/components/Footer.css b/frontend/src/components/Footer.css
new file mode 100644
index 0000000..478346c
--- /dev/null
+++ b/frontend/src/components/Footer.css
@@ -0,0 +1,18 @@
+.site-footer {
+    margin-top: auto;
+    padding: 14px 15px;
+    text-align: center;
+    font-size: 12px;
+    color: #8a94a6;
+    border-top: 1px solid #e6ebf2;
+    background: #f7f9fc;
+}
+
+.site-footer a {
+    color: #6b7785;
+    text-decoration: none;
+}
+
+.site-footer a:hover {
+    text-decoration: underline;
+}
diff --git a/frontend/src/components/Footer.js b/frontend/src/components/Footer.js
new file mode 100644
index 0000000..25f2154
--- /dev/null
+++ b/frontend/src/components/Footer.js
@@ -0,0 +1,13 @@
+import React from 'react';
+import './Footer.css';
+
+// 页面底部 ICP 备案号（合规要求：中国大陆网站须公开展示备案号并链接到工信部备案查询）
+export default function Footer() {
+    return (
+        <footer className="site-footer">
+            <a href="https://beian.miit.gov.cn" target="_blank" rel="noopener noreferrer">
+                陕ICP备2026022239号-1
+            </a>
+        </footer>
+    );
+}
diff --git a/frontend/src/components/Login.css b/frontend/src/components/Login.css
index d215673..a7b52cb 100644
--- a/frontend/src/components/Login.css
+++ b/frontend/src/components/Login.css
@@ -1,5 +1,5 @@
 .login-wrap {
-    min-height: 100vh;
+    flex: 1 0 auto;
     display: flex;
     align-items: center;
     justify-content: center;
diff --git a/frontend/src/index.css b/frontend/src/index.css
index ec2585e..19f30f7 100644
--- a/frontend/src/index.css
+++ b/frontend/src/index.css
@@ -11,3 +11,10 @@ code {
   font-family: source-code-pro, Menlo, Monaco, Consolas, 'Courier New',
     monospace;
 }
+
+/* 全站外壳：纵向 flex，min-height 撑满视口，使页脚自然贴底 */
+.app-shell {
+  display: flex;
+  flex-direction: column;
+  min-height: 100vh;
+}
-- 
2.43.0