diff --git a/static/src/components/chat/ShowFileCard.vue b/static/src/components/chat/ShowFileCard.vue
index 35be71e6..ba44907e 100644
--- a/static/src/components/chat/ShowFileCard.vue
+++ b/static/src/components/chat/ShowFileCard.vue
@@ -4,21 +4,10 @@
       <span class="sfc-file-icon" aria-hidden="true"></span>
       <span class="sfc-name" :title="displayName">{{ displayName }}</span>
       <div class="sfc-actions">
-        <button
-          v-if="canCopy"
-          type="button"
-          class="sfc-btn"
-          @click="copyContent"
-        >
+        <button v-if="canCopy" type="button" class="sfc-btn" @click="copyContent">
           {{ copied ? '已复制' : '复制' }}
         </button>
-        <button
-          type="button"
-          class="sfc-btn sfc-btn-download"
-          @click="handleDownload"
-        >
-          下载
-        </button>
+        <button type="button" class="sfc-btn sfc-btn-download" @click="handleDownload">下载</button>
       </div>
     </div>
 
@@ -72,14 +61,13 @@
       <template v-else-if="fileType === 'pdf'">
         <PdfPreview :source="contentUrl" />
       </template>
-
     </div>
   </div>
 </template>
 
 <script setup lang="ts">
 import { ref, computed, onMounted } from 'vue';
-import Prism from 'prismjs';
+import { highlightCode, prismLangForPath } from '@/utils/prismHighlight';
 import { renderMarkdown } from '../../composables/useMarkdownRenderer';
 import PdfPreview from './PdfPreview.vue';
 
@@ -127,30 +115,32 @@ const canPreview = computed(() => {
   return ['text', 'code', 'json', 'csv', 'markdown', 'image', 'pdf'].includes(fileType.value);
 });
 
-const canCopy = computed(() => ['text', 'code', 'json', 'csv', 'markdown'].includes(fileType.value));
+const canCopy = computed(() =>
+  ['text', 'code', 'json', 'csv', 'markdown'].includes(fileType.value)
+);
 
 const isAndroidApp = computed(() => {
-  return typeof (window as any).AndroidDownloadBridge !== 'undefined' ||
-         typeof (window as any).AndroidThemeBridge !== 'undefined';
+  return (
+    typeof (window as any).AndroidDownloadBridge !== 'undefined' ||
+    typeof (window as any).AndroidThemeBridge !== 'undefined'
+  );
 });
 
-const metaText = computed(() => {
-  if (!rawContent.value) return '';
-  const sizeKB = (new Blob([rawContent.value]).size / 1024).toFixed(1);
-  return `${sizeKB} KB`;
-});
+// 根据路径推断 Prism 语言（修复历史遗留：原代码引用了未定义的 displayLang，
+// 高亮从未真正生效，静默 fallback 为纯文本）
+const displayLang = computed(() => prismLangForPath(props.path));
 
 const highlightedCode = computed(() => {
   if (!rawContent.value) return '';
   let content = rawContent.value;
   if (fileType.value === 'json') {
-    try { content = JSON.stringify(JSON.parse(content), null, 2); } catch {}
+    try {
+      content = JSON.stringify(JSON.parse(content), null, 2);
+    } catch {
+      // JSON 解析失败时保留原内容
+    }
   }
-  try {
-    const grammar = Prism.languages[displayLang.value];
-    if (grammar) return Prism.highlight(content, grammar, displayLang.value);
-  } catch {}
-  return content.replace(/&/g, '&amp;').replace(/</g, '&lt;').replace(/>/g, '&gt;');
+  return highlightCode(content, displayLang.value);
 });
 
 const renderedMarkdown = computed(() => {
@@ -160,7 +150,7 @@ const renderedMarkdown = computed(() => {
 
 const csvParsed = computed(() => {
   if (fileType.value !== 'csv' || !rawContent.value) return null;
-  const lines = rawContent.value.split(/\r?\n/).filter(l => l.trim());
+  const lines = rawContent.value.split(/\r?\n/).filter((l) => l.trim());
   const parseLine = (line: string): string[] => {
     const result: string[] = [];
     let current = '';
@@ -168,13 +158,17 @@ const csvParsed = computed(() => {
     for (let i = 0; i < line.length; i++) {
       const ch = line[i];
       if (inQuote) {
-        if (ch === '"' && line[i + 1] === '"') { current += '"'; i++; }
-        else if (ch === '"') inQuote = false;
+        if (ch === '"' && line[i + 1] === '"') {
+          current += '"';
+          i++;
+        } else if (ch === '"') inQuote = false;
         else current += ch;
       } else {
         if (ch === '"') inQuote = true;
-        else if (ch === ',') { result.push(current); current = ''; }
-        else current += ch;
+        else if (ch === ',') {
+          result.push(current);
+          current = '';
+        } else current += ch;
       }
     }
     result.push(current);
@@ -193,20 +187,54 @@ const csvTruncated = computed(() => csvParsed.value?.truncated || false);
 function inferShowFileType(path: string): string {
   const extMap: Record<string, string> = {
     '.txt': 'text',
-    '.md': 'markdown', '.markdown': 'markdown',
-    '.json': 'json', '.json5': 'json',
-    '.csv': 'csv', '.tsv': 'csv',
-    '.yaml': 'text', '.yml': 'text', '.toml': 'text',
-    '.ini': 'text', '.cfg': 'text', '.conf': 'text', '.log': 'text',
-    '.js': 'code', '.ts': 'code', '.jsx': 'code', '.tsx': 'code',
-    '.vue': 'code', '.py': 'code', '.rb': 'code', '.go': 'code',
-    '.rs': 'code', '.java': 'code', '.c': 'code', '.h': 'code',
-    '.cpp': 'code', '.hpp': 'code', '.cs': 'code', '.php': 'code',
-    '.swift': 'code', '.kt': 'code', '.sh': 'code', '.bash': 'code',
-    '.html': 'code', '.htm': 'code', '.css': 'code', '.scss': 'code',
-    '.less': 'code', '.xml': 'code', '.svg': 'image', '.sql': 'code',
-    '.png': 'image', '.jpg': 'image', '.jpeg': 'image',
-    '.gif': 'image', '.webp': 'image', '.bmp': 'image', '.ico': 'image',
+    '.md': 'markdown',
+    '.markdown': 'markdown',
+    '.json': 'json',
+    '.json5': 'json',
+    '.csv': 'csv',
+    '.tsv': 'csv',
+    '.yaml': 'text',
+    '.yml': 'text',
+    '.toml': 'text',
+    '.ini': 'text',
+    '.cfg': 'text',
+    '.conf': 'text',
+    '.log': 'text',
+    '.js': 'code',
+    '.ts': 'code',
+    '.jsx': 'code',
+    '.tsx': 'code',
+    '.vue': 'code',
+    '.py': 'code',
+    '.rb': 'code',
+    '.go': 'code',
+    '.rs': 'code',
+    '.java': 'code',
+    '.c': 'code',
+    '.h': 'code',
+    '.cpp': 'code',
+    '.hpp': 'code',
+    '.cs': 'code',
+    '.php': 'code',
+    '.swift': 'code',
+    '.kt': 'code',
+    '.sh': 'code',
+    '.bash': 'code',
+    '.html': 'code',
+    '.htm': 'code',
+    '.css': 'code',
+    '.scss': 'code',
+    '.less': 'code',
+    '.xml': 'code',
+    '.svg': 'image',
+    '.sql': 'code',
+    '.png': 'image',
+    '.jpg': 'image',
+    '.jpeg': 'image',
+    '.gif': 'image',
+    '.webp': 'image',
+    '.bmp': 'image',
+    '.ico': 'image',
     '.avif': 'image',
     '.pdf': 'pdf'
   };
@@ -244,7 +272,12 @@ async function loadContent() {
       const resp = await fetch(buildContentUrl());
       if (!resp.ok) {
         let msg = resp.statusText;
-        try { const j = await resp.json(); msg = j.error || msg; } catch {}
+        try {
+          const j = await resp.json();
+          msg = j.error || msg;
+        } catch {
+          // 响应体非 JSON 时沿用 statusText
+        }
         error.value = msg || '加载失败';
         return;
       }
@@ -278,7 +311,12 @@ async function handleDownload() {
     const resp = await fetch(url);
     if (!resp.ok) {
       let msg = resp.statusText;
-      try { const j = await resp.json(); msg = j.error || msg; } catch {}
+      try {
+        const j = await resp.json();
+        msg = j.error || msg;
+      } catch {
+        // 响应体非 JSON 时沿用 statusText
+      }
       throw new Error(msg || '下载失败');
     }
     const blob = await resp.blob();
@@ -301,8 +339,12 @@ async function copyContent() {
   try {
     await navigator.clipboard.writeText(rawContent.value);
     copied.value = true;
-    setTimeout(() => { copied.value = false; }, 2000);
-  } catch {}
+    setTimeout(() => {
+      copied.value = false;
+    }, 2000);
+  } catch {
+    // 剪贴板不可用时静默忽略
+  }
 }
 
 function openFullImage() {
@@ -378,7 +420,9 @@ onMounted(() => {
   color: var(--text-secondary);
   font-size: 12px;
   cursor: pointer;
-  transition: background 0.15s, border-color 0.15s;
+  transition:
+    background 0.15s,
+    border-color 0.15s;
 
   &:hover {
     background: var(--surface-muted);
@@ -445,7 +489,9 @@ onMounted(() => {
 }
 
 @keyframes sfc-spin {
-  to { transform: rotate(360deg); }
+  to {
+    transform: rotate(360deg);
+  }
 }
 
 .sfc-code {
@@ -527,5 +573,4 @@ onMounted(() => {
   -webkit-user-select: none;
   user-select: none;
 }
-
 </style>
diff --git a/static/src/components/chat/quickdock/FilePreviewPanel.vue b/static/src/components/chat/quickdock/FilePreviewPanel.vue
index d28d7dfd..515464a1 100644
--- a/static/src/components/chat/quickdock/FilePreviewPanel.vue
+++ b/static/src/components/chat/quickdock/FilePreviewPanel.vue
@@ -2,44 +2,53 @@
   <transition name="qd-preview-slide">
     <aside v-if="previewPath" class="qd-preview">
       <section class="qd-preview__panel">
-      <header class="qd-preview__header">
-        <svg viewBox="0 0 16 16" fill="none">
-          <path
-            d="M4 2.5h5.5L12 5v8.5H4V2.5z"
-            stroke="currentColor"
-            stroke-width="1.3"
-            stroke-linejoin="round"
-          />
-          <path
-            d="M9.5 2.5V5H12"
-            stroke="currentColor"
-            stroke-width="1.3"
-            stroke-linejoin="round"
-          />
-        </svg>
-        <span class="qd-preview__name" :title="previewPath">{{ fileName }}</span>
-        <span class="qd-preview__path" :title="previewPath">{{ dirName }}</span>
-        <button class="qd-preview__close" title="关闭" @click="close">
+        <header class="qd-preview__header">
           <svg viewBox="0 0 16 16" fill="none">
             <path
-              d="M4 4l8 8M12 4l-8 8"
+              d="M4 2.5h5.5L12 5v8.5H4V2.5z"
               stroke="currentColor"
-              stroke-width="1.4"
-              stroke-linecap="round"
+              stroke-width="1.3"
+              stroke-linejoin="round"
+            />
+            <path
+              d="M9.5 2.5V5H12"
+              stroke="currentColor"
+              stroke-width="1.3"
+              stroke-linejoin="round"
             />
           </svg>
-        </button>
-      </header>
-      <div class="qd-preview__body">
-        <div v-if="loading" class="qd-preview__loading">加载中…</div>
-        <div v-else-if="error" class="qd-preview__error">{{ error }}</div>
-        <template v-else>
-          <div v-for="(line, i) in lines" :key="i" class="qd-code-line">
-            <span class="line-no">{{ i + 1 }}</span>
-            <span class="line-text">{{ line }}</span>
-          </div>
-        </template>
-      </div>
+          <span class="qd-preview__name" :title="previewPath">{{ fileName }}</span>
+          <span class="qd-preview__path" :title="previewPath">{{ dirName }}</span>
+          <button class="qd-preview__close" title="关闭" @click="close">
+            <svg viewBox="0 0 16 16" fill="none">
+              <path
+                d="M4 4l8 8M12 4l-8 8"
+                stroke="currentColor"
+                stroke-width="1.4"
+                stroke-linecap="round"
+              />
+            </svg>
+          </button>
+        </header>
+        <div class="qd-preview__body">
+          <div v-if="loading" class="qd-preview__loading">加载中…</div>
+          <div v-else-if="error" class="qd-preview__error">{{ error }}</div>
+          <template v-else>
+            <!-- 行号列 + 整段高亮 pre：Prism 的 token 可能跨行（多行注释/字符串）， -->
+            <!-- 不能按行拆分 v-html，行 hover 用绝对定位高亮条实现 -->
+            <div class="qd-code" @mousemove="onCodeMouseMove" @mouseleave="hoverLine = -1">
+              <div
+                v-if="hoverLine >= 0"
+                class="qd-code-hoverline"
+                :style="{ top: `${hoverLine * LINE_HEIGHT}px` }"
+              ></div>
+              <div class="qd-code-gutter" aria-hidden="true">
+                <span v-for="n in lineCount" :key="n">{{ n }}</span>
+              </div>
+              <pre class="qd-code-pre"><code v-html="highlightedHtml"></code></pre>
+            </div>
+          </template>
+        </div>
       </section>
     </aside>
   </transition>
@@ -49,6 +58,12 @@
 import { computed, ref, watch } from 'vue';
 import { storeToRefs } from 'pinia';
 import { useQuickDockStore } from '@/stores/quickDock';
+import { highlightCode, prismLangForPath } from '@/utils/prismHighlight';
+
+/** 与 quickdock.css 中 .qd-code 的 font-size(12px) × line-height(1.75) 保持同步 */
+const LINE_HEIGHT = 21;
+/** 超过该字符数的文件跳过语法高亮（仍显示纯文本与行号），避免大文件解析卡顿 */
+const HIGHLIGHT_MAX_CHARS = 100 * 1024;
 
 /**
  * 文件预览侧边栏（占位列，位于快捷窗口列右侧、git/终端面板左侧）
@@ -107,9 +122,24 @@ const PREVIEWABLE_EXTS = new Set([
 const quickDock = useQuickDockStore();
 const { previewPath } = storeToRefs(quickDock);
 
-const lines = ref<string[]>([]);
+const rawText = ref('');
 const loading = ref(false);
 const error = ref('');
+const hoverLine = ref(-1);
+
+const previewLang = computed(() => {
+  if (rawText.value.length > HIGHLIGHT_MAX_CHARS) return null;
+  return prismLangForPath(previewPath.value || '');
+});
+
+const highlightedHtml = computed(() => {
+  const html = highlightCode(rawText.value, previewLang.value);
+  // pre 中末尾的单个 \n 不产生视觉空行；文本以换行结尾时补一个，
+  // 保证行号列与代码视觉行一一对齐
+  return rawText.value.endsWith('\n') ? html + '\n' : html;
+});
+
+const lineCount = computed(() => (rawText.value ? rawText.value.split('\n').length : 0));
 
 const fileName = computed(() => {
   const p = previewPath.value || '';
@@ -134,8 +164,9 @@ watch(
   previewPath,
   async (path) => {
     const mySeq = ++loadSeq;
-    lines.value = [];
+    rawText.value = '';
     error.value = '';
+    hoverLine.value = -1;
     if (!path) {
       return;
     }
@@ -154,7 +185,7 @@ watch(
       if (mySeq !== loadSeq) {
         return;
       }
-      lines.value = text.split('\n');
+      rawText.value = text;
     } catch (err: any) {
       if (mySeq !== loadSeq) {
         return;
@@ -169,6 +200,13 @@ watch(
   { immediate: true }
 );
 
+function onCodeMouseMove(event: MouseEvent) {
+  const el = event.currentTarget as HTMLElement;
+  const rect = el.getBoundingClientRect();
+  const idx = Math.floor((event.clientY - rect.top) / LINE_HEIGHT);
+  hoverLine.value = idx >= 0 && idx < lineCount.value ? idx : -1;
+}
+
 function close() {
   quickDock.closePreview();
 }
diff --git a/static/src/components/chat/quickdock/quickdock.css b/static/src/components/chat/quickdock/quickdock.css
index 69b2e152..731168cb 100644
--- a/static/src/components/chat/quickdock/quickdock.css
+++ b/static/src/components/chat/quickdock/quickdock.css
@@ -851,29 +851,49 @@
   color: var(--state-danger);
 }
 
-.qd-code-line {
+/* 行高 = 12px × 1.75 = 21px，与 FilePreviewPanel.vue 中 LINE_HEIGHT 保持同步 */
+.qd-code {
+  position: relative;
   display: flex;
+  align-items: flex-start;
   font-family: ui-monospace, 'SF Mono', Menlo, monospace;
   font-size: 12px;
   line-height: 1.75;
 }
 
-.qd-code-line:hover {
+.qd-code-hoverline {
+  position: absolute;
+  left: 0;
+  right: 0;
+  height: 21px;
   background: var(--hover-bg);
+  pointer-events: none;
 }
 
-.qd-code-line .line-no {
+.qd-code-gutter {
+  position: relative;
+  z-index: 1;
   flex: none;
   width: 44px;
   padding-right: 12px;
+  box-sizing: border-box;
   text-align: right;
   color: var(--text-tertiary);
   user-select: none;
 }
 
-.qd-code-line .line-text {
+.qd-code-gutter span {
+  display: block;
+}
+
+.qd-code-pre {
+  position: relative;
+  z-index: 1;
   flex: 1;
+  min-width: 0;
+  margin: 0;
   padding-right: 14px;
+  font: inherit;
   white-space: pre;
   color: var(--text-primary);
 }
diff --git a/static/src/env.d.ts b/static/src/env.d.ts
index 8cf3b8a6..eeb9a14a 100644
--- a/static/src/env.d.ts
+++ b/static/src/env.d.ts
@@ -5,9 +5,9 @@ declare module '*.vue' {
 }
 
 declare module 'prismjs';
+declare module 'prismjs/components/*';
 declare module 'katex/contrib/auto-render';
 declare module '*.md' {
   const content: string;
   export default content;
 }
-
diff --git a/static/src/styles/base/_prism-overrides.scss b/static/src/styles/base/_prism-overrides.scss
new file mode 100644
index 00000000..27afa5ae
--- /dev/null
+++ b/static/src/styles/base/_prism-overrides.scss
@@ -0,0 +1,15 @@
+// 覆盖 prismjs 默认主题（prism.css）的运算符底色。
+//
+// 默认主题中 `.token.operator / .entity / .url`（含 `.language-css .token.string`）
+// 带有 `background: hsla(0, 0%, 100%, .5)` 半透明白底——浅色主题下几乎不可见，
+// 深色主题下会渲染成一层灰色色块（典型如 `=` / `==` 出现灰底）。
+// 这里只去掉底色、保留字符变色，高亮颜色本身仍由 prism.css 提供。
+// 该覆盖全局生效：代码块、show_file 卡片、快捷窗口文件预览共用同一套 Prism 主题。
+
+.token.operator,
+.token.entity,
+.token.url,
+.language-css .token.string,
+.style .token.string {
+  background: none;
+}
diff --git a/static/src/styles/index.scss b/static/src/styles/index.scss
index 702f9f5a..bf55554e 100644
--- a/static/src/styles/index.scss
+++ b/static/src/styles/index.scss
@@ -1,6 +1,7 @@
 @use './base/reset';
 @use './base/tokens';
 @use './base/global';
+@use './base/prism-overrides';
 @use './layout/app-shell';
 @use './layout/panels';
 @use './components/sidebar/conversation';
diff --git a/static/src/utils/prismHighlight.ts b/static/src/utils/prismHighlight.ts
new file mode 100644
index 00000000..a8ca1cb1
--- /dev/null
+++ b/static/src/utils/prismHighlight.ts
@@ -0,0 +1,136 @@
+/**
+ * Prism 语法高亮共享模块。
+ *
+ * 集中完成两件事：
+ * 1. 注册常用语言包（prismjs 核心只自带 markup/css/clike/javascript，
+ *    其余语言必须显式 import；在此统一注册后，CodeBlock / ShowFileCard /
+ *    快捷窗口文件预览等所有使用 Prism 的地方自动获益）。
+ * 2. 提供「路径 → Prism 语言 id」映射与「文本 → 高亮 HTML」的纯函数。
+ *
+ * 颜色样式复用 main.ts 引入的 prismjs/themes/prism.css（与代码块渲染同款），
+ * 本模块不产出任何颜色相关代码。
+ */
+
+import Prism from 'prismjs';
+
+// ---- 语言包注册（注意 import 顺序即依赖顺序：被依赖的语言必须先加载） ----
+import 'prismjs/components/prism-markup-templating'; // php 依赖
+import 'prismjs/components/prism-c';
+import 'prismjs/components/prism-cpp'; // 依赖 c
+import 'prismjs/components/prism-java';
+import 'prismjs/components/prism-csharp';
+import 'prismjs/components/prism-kotlin';
+import 'prismjs/components/prism-swift';
+import 'prismjs/components/prism-go';
+import 'prismjs/components/prism-rust';
+import 'prismjs/components/prism-php'; // 依赖 markup-templating
+import 'prismjs/components/prism-python';
+import 'prismjs/components/prism-ruby';
+import 'prismjs/components/prism-bash';
+import 'prismjs/components/prism-powershell';
+import 'prismjs/components/prism-batch';
+import 'prismjs/components/prism-yaml';
+import 'prismjs/components/prism-json';
+import 'prismjs/components/prism-sql';
+import 'prismjs/components/prism-scss';
+import 'prismjs/components/prism-sass';
+import 'prismjs/components/prism-less';
+import 'prismjs/components/prism-typescript';
+import 'prismjs/components/prism-jsx';
+import 'prismjs/components/prism-tsx'; // 依赖 jsx + typescript
+import 'prismjs/components/prism-toml';
+import 'prismjs/components/prism-ini';
+import 'prismjs/components/prism-markdown';
+
+/** 扩展名（小写、带点）→ Prism 语言 id */
+const EXT_TO_PRISM_LANG: Record<string, string> = {
+  '.js': 'javascript',
+  '.mjs': 'javascript',
+  '.cjs': 'javascript',
+  '.jsx': 'jsx',
+  '.ts': 'typescript',
+  '.mts': 'typescript',
+  '.cts': 'typescript',
+  '.tsx': 'tsx',
+  '.vue': 'markup',
+  '.py': 'python',
+  '.rb': 'ruby',
+  '.go': 'go',
+  '.rs': 'rust',
+  '.java': 'java',
+  '.c': 'c',
+  '.h': 'c',
+  '.cpp': 'cpp',
+  '.hpp': 'cpp',
+  '.cc': 'cpp',
+  '.hh': 'cpp',
+  '.cxx': 'cpp',
+  '.cs': 'csharp',
+  '.php': 'php',
+  '.swift': 'swift',
+  '.kt': 'kotlin',
+  '.kts': 'kotlin',
+  '.sh': 'bash',
+  '.bash': 'bash',
+  '.zsh': 'bash',
+  '.ps1': 'powershell',
+  '.bat': 'batch',
+  '.cmd': 'batch',
+  '.html': 'markup',
+  '.htm': 'markup',
+  '.xhtml': 'markup',
+  '.xml': 'markup',
+  '.svg': 'markup',
+  '.css': 'css',
+  '.scss': 'scss',
+  '.sass': 'sass',
+  '.less': 'less',
+  '.json': 'json',
+  '.json5': 'json',
+  '.yaml': 'yaml',
+  '.yml': 'yaml',
+  '.toml': 'toml',
+  '.ini': 'ini',
+  '.cfg': 'ini',
+  '.conf': 'ini',
+  '.sql': 'sql',
+  '.md': 'markdown',
+  '.markdown': 'markdown'
+};
+
+/**
+ * 根据文件路径推断 Prism 语言 id。
+ * @returns 语言 id；无法推断（如 .txt/.log/.csv 或无扩展名）返回 null。
+ */
+export function prismLangForPath(path: string): string | null {
+  const name = path.split('/').pop() || '';
+  const dotIdx = name.lastIndexOf('.');
+  if (dotIdx < 0) return null;
+  const ext = name.slice(dotIdx).toLowerCase();
+  return EXT_TO_PRISM_LANG[ext] || null;
+}
+
+/** HTML 转义（Prism 不可用时的兜底渲染） */
+export function escapeHtml(text: string): string {
+  return text.replace(/&/g, '&amp;').replace(/</g, '&lt;').replace(/>/g, '&gt;');
+}
+
+/**
+ * 对整段代码做语法高亮，返回可安全用于 v-html 的 HTML 字符串。
+ * 语言未注册或高亮过程抛错时，回退为转义后的纯文本。
+ */
+export function highlightCode(content: string, lang: string | null): string {
+  if (lang) {
+    const grammar = Prism.languages[lang];
+    if (grammar) {
+      try {
+        return Prism.highlight(content, grammar, lang);
+      } catch {
+        // fallthrough 到纯文本兜底
+      }
+    }
+  }
+  return escapeHtml(content);
+}
+
+export { Prism };