* { box-sizing: border-box; }
body {
  margin: 0; font-family: -apple-system, "PingFang SC", "Microsoft YaHei", "Helvetica Neue", Arial, sans-serif;
  color: #2b2b2b; background: #fafafa; line-height: 1.7;
}
.layout { display: flex; min-height: 100vh; }
/* 侧边栏 */
.sidebar {
  width: 300px; flex-shrink: 0; background: #fff; border-right: 1px solid #eaeaea;
  padding: 24px 16px; position: sticky; top: 0; height: 100vh; overflow-y: auto;
  font-size: 14px;
}
.sidebar h1 { font-size: 16px; margin: 0 0 16px 8px; color: #1a1a1a; }
.sidebar .brand {
  display: flex; align-items: center; gap: 8px; padding: 0 8px 16px;
  border-bottom: 1px solid #f0f0f0; margin-bottom: 16px;
}
.sidebar .brand .logo {
  width: 28px; height: 28px; border-radius: 6px; background: linear-gradient(135deg,#4f8cff,#6ad6c5);
  display: inline-flex; align-items: center; justify-content: center; color: #fff; font-weight: 700; font-size: 13px;
}
.sidebar .brand span { font-weight: 600; color: #1a1a1a; }
.sidebar section { margin-bottom: 18px; }
.sidebar h2 {
  font-size: 12px; color: #888; font-weight: 600;
  text-transform: uppercase; letter-spacing: 0.05em; margin: 12px 8px 6px;
}
.sidebar ul { list-style: none; padding: 0; margin: 0; }
.sidebar li a {
  display: block; padding: 6px 10px; border-radius: 6px; color: #444;
  text-decoration: none; transition: background 0.15s;
}
.sidebar li a:hover { background: #f1f4ff; color: #2b5fd1; }
.sidebar li a.active { background: #e8efff; color: #2b5fd1; font-weight: 500; }
.sidebar li ul { padding-left: 14px; }
.sidebar li ul a { font-size: 13px; padding: 4px 10px; color: #666; }

/* 主内容 */
.main { flex: 1; min-width: 0; }
.topbar {
  height: 52px; background: #fff; border-bottom: 1px solid #eaeaea;
  display: flex; align-items: center; padding: 0 24px; position: sticky; top: 0; z-index: 10;
}
.topbar .breadcrumb { color: #888; font-size: 13px; }
.topbar .breadcrumb a { color: #666; text-decoration: none; }
.topbar .breadcrumb a:hover { color: #2b5fd1; }
.topbar .source {
  margin-left: auto; font-size: 12px; color: #aaa;
}
.topbar .source a { color: #2b5fd1; text-decoration: none; }

.content { max-width: 880px; margin: 0 auto; padding: 40px 32px 120px; background: #fff; min-height: calc(100vh - 52px); }
.content h1 { font-size: 30px; margin: 32px 0 16px; color: #1a1a1a; padding-bottom: 12px; border-bottom: 2px solid #f0f0f0; }
.content h1:first-child { margin-top: 0; }
.content h2 { font-size: 22px; margin: 32px 0 14px; color: #1a1a1a; }
.content h3 { font-size: 18px; margin: 24px 0 10px; color: #333; }
.content h4 { font-size: 16px; margin: 20px 0 8px; color: #444; }
.content p { margin: 10px 0; color: #333; }
.content p.empty { height: 0.6em; }
.content a { color: #2b5fd1; text-decoration: none; }
.content a:hover { text-decoration: underline; }
.content ul, .content ol { padding-left: 1.6em; margin: 10px 0; }
.content li { margin: 4px 0; }
.content hr { border: none; border-top: 1px solid #eaeaea; margin: 28px 0; }
.content img { max-width: 100%; height: auto; border-radius: 6px; box-shadow: 0 2px 12px rgba(0,0,0,0.06); margin: 8px 0; }
.content figure.img { margin: 16px 0; text-align: center; }
.content figure.img figcaption { font-size: 12px; color: #999; margin-top: 6px; }
.content figure.video { margin: 16px 0; }
.content figure.video video { max-width: 100%; border-radius: 6px; background: #000; }
.content figure.video figcaption { font-size: 12px; color: #999; margin-top: 6px; text-align: center; }
.content table { border-collapse: collapse; width: 100%; margin: 16px 0; font-size: 14px; }
.content th, .content td { border: 1px solid #e0e0e0; padding: 8px 12px; text-align: left; vertical-align: top; }
.content tr:first-child td { background: #f7f9fc; font-weight: 600; }
.content blockquote {
  margin: 12px 0; padding: 8px 14px; border-left: 3px solid #4f8cff;
  background: #f7faff; color: #555;
}
.content pre { background: #1e1e2e; color: #e0e0e8; padding: 14px 18px; border-radius: 8px; overflow-x: auto; }
.content code { font-family: "SF Mono", Menlo, Consolas, monospace; font-size: 0.92em; }
.content p.attachment a { display: inline-block; padding: 8px 14px; background: #f1f4ff; border-radius: 6px; color: #2b5fd1; }
.content p.embed { background: #f7faff; padding: 10px 14px; border-radius: 6px; font-size: 14px; }
.content .callout {
  background: #fff8e6; border-left: 3px solid #f5a623; padding: 10px 14px;
  margin: 14px 0; border-radius: 0 4px 4px 0;
}
.content .broken-link { color: #d1d1d1; cursor: help; text-decoration: line-through; }
.content a.workspace-link {
  color: #b0b0b0; border-bottom: 1px dashed #ccc;
}
.content a.workspace-link:hover { color: #888; border-bottom-color: #888; }
.content a.workspace-link::after {
  content: ' 🔒'; font-size: 10px; color: #aaa;
}

/* 响应式 */
@media (max-width: 900px) {
  .sidebar { display: none; }
}

/* 首页特殊 */
.home-hero {
  background: linear-gradient(135deg,#4f8cff 0%, #6ad6c5 100%);
  color: #fff; padding: 36px 32px; border-radius: 12px; margin-bottom: 32px;
}
.home-hero h1 { color: #fff; border: 0; padding: 0; margin: 0 0 8px; font-size: 28px; }
.home-hero p { color: rgba(255,255,255,0.9); margin: 0; }
.home-grid { display: grid; grid-template-columns: repeat(auto-fill,minmax(260px,1fr)); gap: 14px; margin-top: 18px; }
.home-card {
  background: #fff; border: 1px solid #eaeaea; border-radius: 10px; padding: 14px 16px;
  transition: all 0.2s; text-decoration: none; color: #333; display: block;
}
.home-card:hover { border-color: #4f8cff; transform: translateY(-1px); box-shadow: 0 4px 14px rgba(79,140,255,0.12); }
.home-card .card-title { font-weight: 600; color: #1a1a1a; margin-bottom: 4px; }
.home-card .card-desc { font-size: 13px; color: #888; }