:root {
  --bg: #0b1020;
  --panel: #11172a;
  --text: #e8edf7;
  --muted: #9fb0cb;
  --link: #74b3ff;
  --border: #27324b;
  --code: #0f1424;
}
* { box-sizing: border-box; }
body { margin: 0; font-family: Inter, ui-sans-serif, system-ui, -apple-system, BlinkMacSystemFont, 'Segoe UI', sans-serif; background: var(--bg); color: var(--text); }
.topbar { position: sticky; top: 0; z-index: 50; display: flex; justify-content: space-between; align-items: center; padding: 14px 22px; border-bottom: 1px solid var(--border); background: rgba(11,16,32,0.96); backdrop-filter: blur(12px); }
.brand { font-weight: 700; }
.site-tag { color: var(--muted); font-size: 14px; }
.layout { display: grid; grid-template-columns: 280px minmax(0, 1fr) 240px; gap: 0; min-height: calc(100vh - 57px); }
.sidebar, .toc { padding: 24px 18px; border-right: 1px solid var(--border); background: var(--panel); overflow: auto; }
.toc { border-right: 0; border-left: 1px solid var(--border); }
.sidebar-title, .toc-title { font-size: 12px; text-transform: uppercase; letter-spacing: .08em; color: var(--muted); margin-bottom: 14px; }
.sidebar a, .toc a { display: block; color: var(--muted); text-decoration: none; padding: 8px 10px; border-radius: 10px; margin-bottom: 4px; }
.sidebar a:hover, .toc a:hover { background: rgba(255,255,255,0.04); color: var(--text); }
.sidebar a.active { background: rgba(116,179,255,0.12); color: #fff; }
.toc a.toc-level-3 { padding-left: 20px; font-size: 14px; }
.content { padding: 32px 48px 64px; max-width: 900px; width: 100%; }
.content h1, .content h2, .content h3 { line-height: 1.15; }
.content h1 { font-size: 38px; margin: 0 0 20px; }
.content h2 { font-size: 26px; margin-top: 38px; border-top: 1px solid var(--border); padding-top: 24px; }
.content h3 { font-size: 20px; margin-top: 28px; }
.content p, .content li { color: var(--text); line-height: 1.68; }
.content a { color: var(--link); }
.content code { background: rgba(255,255,255,0.06); padding: 2px 6px; border-radius: 6px; font-family: ui-monospace, SFMono-Regular, Menlo, Consolas, monospace; }
.content pre { background: var(--code); border: 1px solid var(--border); padding: 16px; border-radius: 16px; overflow: auto; }
.content pre code { background: transparent; padding: 0; }
.content blockquote { margin: 20px 0; padding: 14px 18px; border-left: 4px solid var(--link); background: rgba(116,179,255,0.08); border-radius: 10px; }
.content table { width: 100%; border-collapse: collapse; margin: 16px 0; }
.content th, .content td { border: 1px solid var(--border); padding: 10px 12px; text-align: left; }
.content th { background: rgba(255,255,255,0.04); }
@media (max-width: 1200px) {
  .layout { grid-template-columns: 260px minmax(0, 1fr); }
  .toc { display: none; }
}
@media (max-width: 860px) {
  .layout { grid-template-columns: 1fr; }
  .sidebar { border-right: 0; border-bottom: 1px solid var(--border); }
  .content { padding: 24px 20px 50px; }
}