diff --git a/public/app.js b/public/app.js
index c76cb4c..fa03a43 100644
--- a/public/app.js
+++ b/public/app.js
@@ -1904,29 +1904,44 @@ function truncNote() {
 
 // ---------- 命令面板 ----------
 const cmdk = {
-  results: [], active: 0, timer: null, scopeAll: true,
+  results: [], active: 0, timer: null, scopeAll: true, contentMode: false,
   open() {
     $('#cmdk').classList.remove('hidden');
     this.updateScopeLabel();
+    this.updateModeLabel();
     const inp = $('#cmdk-input');
     inp.value = '';
     inp.focus();
-    $('#cmdk-results').innerHTML = '<div class="cmdk-loading">输入开始搜索 · 文件名模糊匹配，「内容:」搜全文（含 PDF、截图里的文字）</div>';
+    $('#cmdk-results').innerHTML = `<div class="cmdk-loading">${this.emptyHint()}</div>`;
     this.results = [];
     this.active = 0;
   },
   close() { $('#cmdk').classList.add('hidden'); },
   toggleScope() { this.scopeAll = !this.scopeAll; this.updateScopeLabel(); this.search($('#cmdk-input').value); },
+  // 全文搜索开关：点「搜内容」或 ⇧Tab 即切换，不用再手输「内容:」前缀（前缀仍兼容）
+  toggleMode() { this.contentMode = !this.contentMode; this.updateModeLabel(); this.search($('#cmdk-input').value); },
   root() { return this.scopeAll ? state.home : (state.cwd || state.home); },
   updateScopeLabel() {
     $('#cmdk-scope').textContent = this.scopeAll ? '全机（主目录及以下）' : '当前目录 ' + tilde(state.cwd || state.home);
     $('#scope-toggle').textContent = this.scopeAll ? '⤢ 全机' : '▢ 当前目录';
     $('#scope-toggle').classList.toggle('on', this.scopeAll);
   },
+  updateModeLabel() {
+    $('#mode-toggle').classList.toggle('on', this.contentMode);
+    $('#cmdk-input').placeholder = this.contentMode
+      ? '搜文件内容（全文，含 PDF、截图里的文字）…'
+      : '按文件名搜索…   用 “内容:” 前缀搜文件内容，如 “内容:useState”';
+    if (!$('#cmdk-input').value.trim()) $('#cmdk-results').innerHTML = `<div class="cmdk-loading">${this.emptyHint()}</div>`;
+  },
+  emptyHint() {
+    return this.contentMode
+      ? '输入开始搜索 · 全文搜索（含 PDF、截图里的文字）'
+      : '输入开始搜索 · 文件名模糊匹配，点「搜内容」或用「内容:」前缀搜全文（含 PDF、截图里的文字）';
+  },
   search(q) {
     clearTimeout(this.timer);
-    if (!q.trim()) { $('#cmdk-results').innerHTML = '<div class="cmdk-loading">输入开始搜索</div>'; return; }
-    const isContent = /^(内容[:：]|content:)/i.test(q);
+    if (!q.trim()) { $('#cmdk-results').innerHTML = `<div class="cmdk-loading">${this.emptyHint()}</div>`; return; }
+    const isContent = this.contentMode || /^(内容[:：]|content:)/i.test(q);
     $('#cmdk-results').innerHTML = '<div class="cmdk-loading">搜索中…</div>';
     this.timer = setTimeout(async () => {
       const root = this.root();
@@ -2510,6 +2525,7 @@ function bindEvents() {
   document.addEventListener('click', (e) => { if (!e.target.closest('#context-menu')) closeContextMenu(); });
   window.addEventListener('blur', closeContextMenu);
   $('#scope-toggle').onclick = () => cmdk.toggleScope();
+  $('#mode-toggle').onclick = () => { cmdk.toggleMode(); $('#cmdk-input').focus(); };
 
   $('#toggle-hidden').checked = state.showHidden;
   $('#toggle-hidden').onchange = (e) => { state.showHidden = e.target.checked; localStorage.setItem('fb_hidden', state.showHidden ? '1' : '0'); renderFiles(); };
@@ -2550,7 +2566,7 @@ function bindEvents() {
       if (e.key === 'Escape') cmdk.close();
       else if (e.key === 'ArrowDown') { e.preventDefault(); cmdk.move(1); }
       else if (e.key === 'ArrowUp') { e.preventDefault(); cmdk.move(-1); }
-      else if (e.key === 'Tab') { e.preventDefault(); cmdk.toggleScope(); }
+      else if (e.key === 'Tab') { e.preventDefault(); e.shiftKey ? cmdk.toggleMode() : cmdk.toggleScope(); }
       else if (e.key === 'Enter') { e.preventDefault(); cmdk.choose(cmdk.active, e.metaKey || e.ctrlKey); }
       return;
     }
diff --git a/public/i18n-dict.js b/public/i18n-dict.js
index 72b5741..926bed7 100644
--- a/public/i18n-dict.js
+++ b/public/i18n-dict.js
@@ -223,13 +223,17 @@ window.FANBOX_DICT = {
 
   // ---------- 命令面板 ----------
   '按文件名搜索…   用 “内容:” 前缀搜文件内容，如 “内容:useState”': 'Search by filename…   prefix with “content:” to search inside files, e.g. “content:useState”',
+  '搜文件内容（全文，含 PDF、截图里的文字）…': 'Search inside files (full text, incl. PDFs and text in screenshots)…',
   '切换搜索范围（Tab）': 'Toggle search scope (Tab)',
+  '按内容全文搜索（⇧Tab）': 'Search inside files (⇧Tab)',
+  '▤ 搜内容': '▤ Full text',
   '⤢ 全机': '⤢ This Mac',
   '▢ 当前目录': '▢ This folder',
   '范围：': 'Scope: ',
-  '· Tab 切换范围 · ↑↓ 选择 · ↵ 打开 · ⌘↵ 在编辑器打开': '· Tab scope · ↑↓ select · ↵ open · ⌘↵ open in editor',
+  '· Tab 切换范围 · ⇧Tab 搜内容 · ↑↓ 选择 · ↵ 打开 · ⌘↵ 在编辑器打开': '· Tab scope · ⇧Tab full text · ↑↓ select · ↵ open · ⌘↵ open in editor',
   '全机（主目录及以下）': 'This Mac (home folder and below)',
-  '输入开始搜索 · 文件名模糊匹配，「内容:」搜全文（含 PDF、截图里的文字）': 'Type to search · fuzzy filename match; “content:” searches full text (incl. PDFs and text in screenshots)',
+  '输入开始搜索 · 文件名模糊匹配，点「搜内容」或用「内容:」前缀搜全文（含 PDF、截图里的文字）': 'Type to search · fuzzy filename match; click “Full text” or use the “content:” prefix to search inside files (incl. PDFs and text in screenshots)',
+  '输入开始搜索 · 全文搜索（含 PDF、截图里的文字）': 'Type to search · full-text search (incl. PDFs and text in screenshots)',
   '输入开始搜索': 'Type to search',
   '搜索中…': 'Searching…',
   '没有结果': 'No results',
diff --git a/public/index.html b/public/index.html
index 044c407..edac8ba 100644
--- a/public/index.html
+++ b/public/index.html
@@ -143,10 +143,11 @@
       <div class="cmdk-input-wrap">
         <span class="cmdk-icon"><svg width="17" height="17" viewBox="0 0 24 24" fill="none" stroke="#9aa3b2" stroke-width="2" stroke-linecap="round" stroke-linejoin="round"><circle cx="11" cy="11" r="8"/><line x1="21" y1="21" x2="16.65" y2="16.65"/></svg></span>
         <input id="cmdk-input" placeholder="按文件名搜索…   用 “内容:” 前缀搜文件内容，如 “内容:useState”" autocomplete="off" />
+        <button id="mode-toggle" class="scope-toggle" title="按内容全文搜索（⇧Tab）">▤ 搜内容</button>
         <button id="scope-toggle" class="scope-toggle on" title="切换搜索范围（Tab）">⤢ 全机</button>
         <kbd>ESC</kbd>
       </div>
-      <div id="cmdk-hint" class="cmdk-hint">范围：<b id="cmdk-scope"></b> · Tab 切换范围 · ↑↓ 选择 · ↵ 打开 · ⌘↵ 在编辑器打开</div>
+      <div id="cmdk-hint" class="cmdk-hint">范围：<b id="cmdk-scope"></b> · Tab 切换范围 · ⇧Tab 搜内容 · ↑↓ 选择 · ↵ 打开 · ⌘↵ 在编辑器打开</div>
       <ul id="cmdk-results" class="cmdk-results"></ul>
     </div>
   </div>