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+<!DOCTYPE html>
+<html lang="zh-CN">
+<head>
+<meta charset="UTF-8">
+<meta name="viewport" content="width=device-width, initial-scale=1.0">
+<title>光湖 · 语言层数据库</title>
+<script src="https://cdn.jsdelivr.net/npm/marked/marked.min.js"></script>
+<style>
+:root {
+  --bg: #fafafa;
+  --sidebar-bg: #f0f0f0;
+  --text: #1a1a1a;
+  --border: #e0e0e0;
+  --accent: #4f46e5;
+  --accent-light: #eef2ff;
+  --danger: #dc2626;
+  --danger-light: #fef2f2;
+}
+* { margin:0; padding:0; box-sizing:border-box; }
+body { font-family: -apple-system, BlinkMacSystemFont, "Segoe UI", Roboto, sans-serif; background:var(--bg); color:var(--text); height:100vh; display:flex; flex-direction:column; }
+
+/* Header */
+.header {
+  height:48px; border-bottom:1px solid var(--border); display:flex; align-items:center; padding:0 16px;
+  background:#fff; flex-shrink:0;
+}
+.header h1 { font-size:15px; font-weight:600; }
+.header .actions { margin-left:auto; display:flex; gap:8px; }
+.btn {
+  padding:5px 14px; border-radius:6px; border:1px solid var(--border);
+  background:#fff; font-size:13px; cursor:pointer; transition:all .15s;
+}
+.btn:hover { background:var(--accent-light); border-color:var(--accent); color:var(--accent); }
+.btn-primary { background:var(--accent); color:#fff; border:none; }
+.btn-primary:hover { opacity:.9; }
+.btn-danger { color:var(--danger); }
+.btn-danger:hover { background:var(--danger-light); border-color:var(--danger); }
+
+/* Layout */
+.main { display:flex; flex:1; overflow:hidden; }
+
+/* Sidebar */
+.sidebar {
+  width:260px; background:var(--sidebar-bg); border-right:1px solid var(--border);
+  overflow-y:auto; padding:12px 0; flex-shrink:0;
+}
+.sidebar .tree-item {
+  display:flex; align-items:center; padding:6px 16px; cursor:pointer;
+  font-size:13px; color:var(--text); border-left:3px solid transparent; transition:all .1s;
+}
+.sidebar .tree-item:hover { background:#e8e8e8; }
+.sidebar .tree-item.active { background:var(--accent-light); border-left-color:var(--accent); font-weight:500; }
+.sidebar .tree-item .icon { margin-right:6px; font-size:12px; opacity:.5; }
+
+/* Content */
+.content {
+  flex:1; overflow-y:auto; padding:32px 48px; max-width:800px;
+}
+.content h1 { font-size:24px; margin-bottom:16px; }
+.content h2 { font-size:18px; margin:24px 0 8px; }
+.content h3 { font-size:15px; margin:16px 0 6px; }
+.content p { margin:8px 0; line-height:1.7; font-size:14px; }
+.content code { background:#f0f0f0; padding:1px 5px; border-radius:3px; font-size:13px; }
+.content pre { background:#1a1a2e; color:#e0e0e0; padding:16px; border-radius:8px; overflow-x:auto; margin:12px 0; font-size:13px; line-height:1.5; }
+.content pre code { background:none; padding:0; color:inherit; }
+.content blockquote { border-left:3px solid var(--accent); padding:4px 12px; margin:12px 0; color:#666; font-size:13px; }
+.content ul, .content ol { margin:8px 0; padding-left:24px; }
+.content li { margin:4px 0; font-size:14px; line-height:1.6; }
+.content table { border-collapse:collapse; width:100%; margin:12px 0; font-size:13px; }
+.content th, .content td { border:1px solid var(--border); padding:6px 12px; text-align:left; }
+.content th { background:#f5f5f5; font-weight:600; }
+
+/* Empty state */
+.empty { display:flex; align-items:center; justify-content:center; height:100%; color:#999; font-size:14px; flex-direction:column; gap:8px; }
+.empty .icon-big { font-size:48px; opacity:.3; }
+
+/* Loading */
+.loading { text-align:center; padding:40px; color:#999; }
+</style>
+</head>
+<body>
+
+<div class="header">
+  <h1>🌊 语言层数据库</h1>
+  <div class="actions">
+    <button class="btn btn-primary" onclick="createPage()">+ 新建页面</button>
+  </div>
+</div>
+
+<div class="main">
+  <div class="sidebar" id="sidebar">
+    <div class="loading">加载中…</div>
+  </div>
+  <div class="content" id="content">
+    <div class="empty">
+      <div class="icon-big">📄</div>
+      <div>选择一个页面，或新建一个</div>
+    </div>
+  </div>
+</div>
+
+<script>
+const API_BASE = '/brain/documents';
+let currentDoc = null;
+
+// 加载文档列表
+async function loadTree() {
+  try {
+    const res = await fetch(API_BASE);
+    const json = await res.json();
+    const docs = json.data || [];
+
+    // 过滤掉已删除的
+    const active = docs.filter(d => !d.document_id.startsWith('deleted_'));
+
+    // 构建树
+    const rootDocs = active.filter(d => !d.parent_id);
+    const childMap = {};
+    active.forEach(d => {
+      if (d.parent_id) {
+        if (!childMap[d.parent_id]) childMap[d.parent_id] = [];
+        childMap[d.parent_id].push(d);
+      }
+    });
+
+    let html = '';
+    function renderTree(list, level) {
+      list.forEach(doc => {
+        const indent = level * 16;
+        html += `<div class="tree-item${currentDoc && currentDoc.document_id === doc.document_id ? ' active' : ''}"
+          style="padding-left:${indent + 16}px"
+          onclick="selectDoc('${doc.document_id}')">
+          <span class="icon">${childMap[doc.document_id] ? '📁' : '📄'}</span>
+          ${escapeHtml(doc.title)}
+        </div>`;
+        if (childMap[doc.document_id]) {
+          renderTree(childMap[doc.document_id], level + 1);
+        }
+      });
+    }
+    renderTree(rootDocs, 0);
+    document.getElementById('sidebar').innerHTML = html || '<div class="loading">还没有页面，点「新建页面」开始</div>';
+  } catch (err) {
+    document.getElementById('sidebar').innerHTML = '<div class="loading">加载失败: ' + err.message + '</div>';
+  }
+}
+
+// 选择文档
+async function selectDoc(id) {
+  try {
+    const res = await fetch(`${API_BASE}/${id}`);
+    const json = await res.json();
+    currentDoc = json.data;
+    renderContent();
+    loadTree();
+  } catch (err) {
+    document.getElementById('content').innerHTML = '<div class="loading">加载失败: ' + err.message + '</div>';
+  }
+}
+
+// 渲染内容
+function renderContent() {
+  if (!currentDoc) return;
+
+  let html = `
+    <h1>${escapeHtml(currentDoc.title)}</h1>
+    <div style="display:flex; gap:8px; margin-bottom:24px; padding-bottom:16px; border-bottom:1px solid var(--border);">
+      <span style="font-size:12px; color:#999;">路径: ${escapeHtml(currentDoc.path)}</span>
+      <span style="font-size:12px; color:#999;">版本: ${currentDoc.version}</span>
+      <span style="font-size:12px; color:#999;">${currentDoc.updated_at ? new Date(currentDoc.updated_at).toLocaleString('zh-CN') : ''}</span>
+      <button class="btn btn-danger" style="margin-left:auto" onclick="deleteDoc('${currentDoc.document_id}')">删除</button>
+    </div>
+  `;
+
+  if (currentDoc.content) {
+    html += marked.parse(currentDoc.content);
+  } else {
+    html += '<p style="color:#999;">暂无内容</p>';
+  }
+
+  document.getElementById('content').innerHTML = html;
+}
+
+// 新建页面
+async function createPage() {
+  const title = prompt('页面标题：');
+  if (!title) return;
+
+  const parentId = currentDoc ? currentDoc.document_id : null;
+
+  try {
+    const res = await fetch(API_BASE, {
+      method: 'POST',
+      headers: { 'Content-Type': 'application/json' },
+      body: JSON.stringify({ title, parent_id: parentId, content: '# ' + title + '\n\n' })
+    });
+    const json = await res.json();
+    if (json.data) {
+      currentDoc = json.data;
+      renderContent();
+      loadTree();
+    }
+  } catch (err) {
+    alert('创建失败: ' + err.message);
+  }
+}
+
+// 删除页面
+async function deleteDoc(id) {
+  if (!confirm('确定删除这个页面？')) return;
+
+  try {
+    await fetch(`${API_BASE}/${id}`, { method: 'DELETE' });
+    currentDoc = null;
+    document.getElementById('content').innerHTML = '<div class="empty"><div class="icon-big">📄</div><div>选择一个页面，或新建一个</div></div>';
+    loadTree();
+  } catch (err) {
+    alert('删除失败: ' + err.message);
+  }
+}
+
+function escapeHtml(text) {
+  const div = document.createElement('div');
+  div.textContent = text;
+  return div.innerHTML;
+}
+
+// 初始化
+loadTree();
+</script>
+</body>
+</html>
