diff --git a/wxt.config.ts b/wxt.config.ts
index f0218ba..2b19027 100644
--- a/wxt.config.ts
+++ b/wxt.config.ts
@@ -1,4 +1,59 @@
 import { defineConfig } from 'wxt';
+import type { Plugin } from 'vite';
+
+/**
+ * 仅在 HTML 多入口构建（popup / options / sidepanel）中启用 manualChunks 拆分 vendor。
+ * WXT 对 background / content-script 使用 lib 模式（IIFE），该模式不支持 manualChunks。
+ */
+function manualChunksForHtmlOnly(): Plugin {
+  return {
+    name: 'manual-chunks-html-only',
+    outputOptions(rawOptions) {
+      // lib 模式（IIFE）不支持 manualChunks，仅对 ES/CJS 格式启用
+      if (rawOptions.format === 'iife' || rawOptions.format === 'umd') {
+        return;
+      }
+      rawOptions.manualChunks = (id: string) => {
+        if (!id.includes('node_modules')) return;
+
+        // React 核心
+        if (id.includes('/react-dom/') || (id.includes('/react/') && !id.includes('/react-dom/'))) {
+          return 'vendor-react';
+        }
+        // MUI + Emotion
+        if (
+          id.includes('@mui/') ||
+          id.includes('@emotion/') ||
+          id.includes('hoist-non-react-statics') ||
+          id.includes('csstype') ||
+          id.includes('@popperjs/')
+        ) {
+          return 'vendor-mui';
+        }
+        // 国际化
+        if (
+          id.includes('i18next') ||
+          id.includes('react-i18next') ||
+          id.includes('intl-messageformat')
+        ) {
+          return 'vendor-i18n';
+        }
+        // QR 相关
+        if (id.includes('qr-scanner') || id.includes('qrious')) {
+          return 'vendor-qr';
+        }
+        // 拖拽
+        if (id.includes('@dnd-kit')) {
+          return 'vendor-dnd';
+        }
+        // Markdown
+        if (id.includes('marked')) {
+          return 'vendor-markdown';
+        }
+      };
+    },
+  };
+}
 
 // See https://wxt.dev/api/config.html
 export default defineConfig({
@@ -31,19 +86,12 @@ export default defineConfig({
     },
   },
   vite: () => ({
+    plugins: [manualChunksForHtmlOnly()],
     build: {
-      // 1. 切换压缩器为 terser
       minify: 'terser',
-
-      // 2. 配置 terser 强制转义所有非 ASCII 字符
       terserOptions: {
-        format: {
-          ascii_only: true,
-          comments: false,
-        },
+        format: { ascii_only: true, comments: false },
       },
-
-      // 3. 调整 chunk 大小警告阈值
       chunkSizeWarningLimit: 600,
     },
   }),