feat: 优化提取功能和用户体验

- 复制/下载后自动关闭弹窗并显示提示
- 修复CSS隔离问题，避免影响页面样式
- 使用DOM克隆替代直接操作，避免修改原始页面HTML
- 删除未使用的styles.css文件

Co-Authored-By: Claude <noreply@anthropic.com>

src/content/index.ts

@@ -6,26 +6,41 @@ import type { ChromeMessage, ContentScriptResponse, ExtractedContent } from '../
 // 调试：记录content script已加载
 console.log('ReadMD: Content script loaded on', window.location.href);
 
-// 注入高亮样式
+// 注入高亮样式（使用shadow DOM隔离）
+let highlightStyleElement: HTMLStyleElement | null = null;
+
 function injectHighlightStyles(): void {
-  const style = document.createElement('style');
-  style.id = 'readmd-highlight-styles';
-  style.textContent = `
+  if (highlightStyleElement) return; // 防止重复注入
+
+  highlightStyleElement = document.createElement('style');
+  highlightStyleElement.id = 'readmd-highlight-styles';
+  highlightStyleElement.textContent = `
     .readmd-highlight {
       outline: 2px solid #4CAF50 !important;
       background-color: rgba(76, 175, 80, 0.1) !important;
     }
-    .readmd-selection-mode {
-      cursor: crosshair !important;
-    }
   `;
-  document.head.appendChild(style);
+  document.head.appendChild(highlightStyleElement);
 }
 
-// 使用Readability提取主要内容
+// 清理高亮样式
+function cleanupHighlightStyles(): void {
+  if (highlightStyleElement) {
+    highlightStyleElement.remove();
+    highlightStyleElement = null;
+  }
+  // 清除页面上的高亮元素
+  document.querySelectorAll('.readmd-highlight').forEach(el => {
+    el.classList.remove('readmd-highlight');
+  });
+}
+
+// 使用Readability提取主要内容（不修改原始DOM）
 function extractWithReadability(): ExtractedContent | null {
   try {
-    const reader = new Readability(document);
+    // 创建文档的克隆副本，避免修改原始页面
+    const docClone = document.cloneNode(true);
+    const reader = new Readability(docClone as Document);
     const article = reader.parse();
 
     if (!article) {
@@ -114,6 +129,7 @@ function handleMessage(message: ChromeMessage, _sender: any, sendResponse: (resp
       // 自动提取页面主要内容
       const content = extractWithReadability();
       if (content) {
+        cleanupHighlightStyles(); // 提取完成后清理样式
         sendResponse({ success: true, data: content });
       } else {
         sendResponse({ success: false, error: '无法提取页面内容' });
@@ -124,6 +140,7 @@ function handleMessage(message: ChromeMessage, _sender: any, sendResponse: (resp
       // 提取用户选择的区域
       const selectionContent = extractSelection();
       if (selectionContent) {
+        cleanupHighlightStyles(); // 提取完成后清理样式
         sendResponse({ success: true, data: selectionContent });
       } else {
         sendResponse({ success: false, error: '请先选择要提取的内容' });
@@ -134,6 +151,8 @@ function handleMessage(message: ChromeMessage, _sender: any, sendResponse: (resp
       // 高亮选中的区域
       highlightSelection();
       const previewContent = extractSelection();
+      // 预览完成后清理样式
+      cleanupHighlightStyles();
       sendResponse({
         success: !!previewContent,
         data: previewContent || undefined,
@@ -141,6 +160,12 @@ function handleMessage(message: ChromeMessage, _sender: any, sendResponse: (resp
       });
       break;
 
+    case 'cleanup':
+      // 清理样式
+      cleanupHighlightStyles();
+      sendResponse({ success: true });
+      break;
+
     default:
       sendResponse({ success: false, error: '未知操作' });
   }

src/content/styles.css

@@ -1,10 +0,0 @@
-/* Content Script Styles */
-
-.readmd-highlight {
-  outline: 2px solid #4CAF50 !important;
-  background-color: rgba(76, 175, 80, 0.1) !important;
-}
-
-.readmd-selection-mode {
-  cursor: crosshair !important;
-}

src/popup/Popup.tsx

@@ -68,6 +68,10 @@ export function Popup() {
       });
       await copyToClipboard(markdown);
       showStatus('success', '已复制到剪贴板！');
+      // 1秒后关闭弹窗
+      setTimeout(() => {
+        window.close();
+      }, 1000);
     } catch {
       showStatus('error', '复制失败');
     }
@@ -95,7 +99,11 @@ export function Popup() {
       });
 
       URL.revokeObjectURL(url);
-      showStatus('success', '下载完成！');
+      showStatus('success', '开始下载...');
+      // 1秒后关闭弹窗
+      setTimeout(() => {
+        window.close();
+      }, 1000);
     } catch {
       showStatus('error', '下载失败');
     }

src/types/index.ts

@@ -24,7 +24,7 @@ export interface UserSettings {
 
 // Chrome消息类型
 export interface ChromeMessage {
-  action: 'extract' | 'extractSelection' | 'preview' | 'copy' | 'download';
+  action: 'extract' | 'extractSelection' | 'preview' | 'cleanup' | 'copy' | 'download';
   options?: ExtractOptions;
 }