diff --git a/frontend/app.js b/frontend/app.js
index 47ec0c2..42d8d88 100644
--- a/frontend/app.js
+++ b/frontend/app.js
@@ -288,12 +288,24 @@ createApp({
   methods: {
     // ========== 主题管理 ==========
     // 初始化主题
-    initTheme() {
+    async initTheme() {
       // 先从localStorage读取，避免页面闪烁
       const savedTheme = localStorage.getItem('theme');
       if (savedTheme) {
         this.applyTheme(savedTheme);
       }
+      // 如果没有登录，从公开API获取全局主题
+      if (!this.token) {
+        try {
+          const res = await axios.get(`${this.apiBase}/api/public/theme`);
+          if (res.data.success) {
+            this.globalTheme = res.data.theme;
+            this.applyTheme(res.data.theme);
+          }
+        } catch (e) {
+          console.log('无法加载全局主题');
+        }
+      }
     },
 
     // 加载用户主题设置（登录后调用）
diff --git a/frontend/index.html b/frontend/index.html
index 8270ff1..905fb18 100644
--- a/frontend/index.html
+++ b/frontend/index.html
@@ -22,6 +22,7 @@
       box-sizing: border-box;
     }
 
+    /* 暗色主题（默认） */
     :root {
       --bg-primary: #0a0a0f;
       --bg-secondary: #12121a;
@@ -35,6 +36,43 @@
       --glow: rgba(102, 126, 234, 0.4);
     }
 
+    /* 亮色主题 */
+    .light-theme {
+      --bg-primary: #f0f4f8;
+      --bg-secondary: #ffffff;
+      --glass: rgba(102, 126, 234, 0.05);
+      --glass-border: rgba(102, 126, 234, 0.15);
+      --text-primary: #1a1a2e;
+      --text-secondary: rgba(26, 26, 46, 0.7);
+      --accent-1: #5a67d8;
+      --accent-2: #6b46c1;
+      --accent-3: #d53f8c;
+      --glow: rgba(90, 103, 216, 0.3);
+    }
+
+    /* 亮色主题特定样式 */
+    body.light-theme .navbar {
+      background: rgba(255, 255, 255, 0.85);
+    }
+
+    body.light-theme .grid-bg {
+      background-image:
+        linear-gradient(rgba(102, 126, 234, 0.05) 1px, transparent 1px),
+        linear-gradient(90deg, rgba(102, 126, 234, 0.05) 1px, transparent 1px);
+    }
+
+    body.light-theme .gradient-orb {
+      opacity: 0.3;
+    }
+
+    body.light-theme .feature-card {
+      background: rgba(255, 255, 255, 0.7);
+    }
+
+    body.light-theme .tech-bar {
+      background: rgba(255, 255, 255, 0.8);
+    }
+
     body {
       font-family: -apple-system, BlinkMacSystemFont, 'Segoe UI', Roboto, sans-serif;
       background: var(--bg-primary);
@@ -610,5 +648,20 @@
       玩玩云 © 2025
     </div>
   </div>
+
+  <script>
+    // 加载全局主题
+    (async function() {
+      try {
+        const response = await fetch('/api/public/theme');
+        const data = await response.json();
+        if (data.success && data.theme === 'light') {
+          document.body.classList.add('light-theme');
+        }
+      } catch (e) {
+        console.log('无法加载主题设置');
+      }
+    })();
+  </script>
 </body>
 </html>