*, *::before, *::after { box-sizing: border-box; margin: 0; padding: 0; }
:root { --bg:#fff; --bg2:#f6f8fa; --text:#1f2328; --muted:#656d76; --border:#d1d9e0;
  --accent:#0969da; --accent2:#ddf4ff; --code-bg:#f6f8fa; --code-border:#d1d9e0;
  --sidebar-bg:#f6f8fa; --sidebar-w:280px; --shadow:0 1px 3px rgba(0,0,0,.08); --radius:8px; }
@media(prefers-color-scheme:dark){ :root:not([data-theme="light"]){
  --bg:#0d1117; --bg2:#161b22; --text:#e6edf3; --muted:#8b949e; --border:#30363d;
  --accent:#58a6ff; --accent2:#1a3a5c; --code-bg:#161b22; --code-border:#30363d;
  --sidebar-bg:#161b22; --shadow:0 1px 3px rgba(0,0,0,.3); } }
[data-theme="dark"]{ --bg:#0d1117; --bg2:#161b22; --text:#e6edf3; --muted:#8b949e; --border:#30363d;
  --accent:#58a6ff; --accent2:#1a3a5c; --code-bg:#161b22; --code-border:#30363d;
  --sidebar-bg:#161b22; --shadow:0 1px 3px rgba(0,0,0,.3); }
body { font-family:-apple-system,BlinkMacSystemFont,"Segoe UI",Noto Sans,Helvetica,Arial,sans-serif;
  font-size:16px; line-height:1.6; color:var(--text); background:var(--bg); }
.layout { display:flex; min-height:100vh; }
.sidebar { width:var(--sidebar-w); background:var(--sidebar-bg); border-right:1px solid var(--border);
  position:fixed; top:0; left:0; bottom:0; overflow-y:auto; z-index:100; display:flex; flex-direction:column; }
.sidebar-header { padding:20px 16px 12px; border-bottom:1px solid var(--border);
  display:flex; align-items:center; justify-content:center; }
.sidebar-header .logo { display:flex; align-items:center; text-decoration:none; }
.sidebar-logo-img { max-width:200px; height:auto; padding:4px 0; }
.sidebar-close { display:none; background:none; border:none; font-size:20px; color:var(--muted); cursor:pointer; }
.sidebar-content { padding:12px 0; flex:1; overflow-y:auto; }
.sidebar-content>a, .nav-section a { display:block; padding:6px 16px; color:var(--muted);
  text-decoration:none; font-size:14px; border-left:3px solid transparent; transition:all .15s; }
.sidebar-content>a:hover, .nav-section a:hover { color:var(--text); background:var(--accent2); }
.sidebar-content>a.active, .nav-section a.active { color:var(--accent); border-left-color:var(--accent); font-weight:600; }
.nav-section { margin:4px 0; }
.nav-section summary { padding:6px 16px; font-size:12px; font-weight:600; text-transform:uppercase;
  letter-spacing:.05em; color:var(--muted); cursor:pointer; list-style:none; user-select:none; }
.nav-section summary::before { content:"\25B8 "; }
.nav-section[open] summary::before { content:"\25BE "; }
.nav-section summary::-webkit-details-marker { display:none; }
.nav-section a { padding-left:28px; }
.main { margin-left:var(--sidebar-w); flex:1; min-width:0; }
.topbar { position:sticky; top:0; background:var(--bg); border-bottom:1px solid var(--border);
  padding:8px 24px; display:flex; align-items:center; justify-content:space-between; z-index:50; }
.menu-btn { display:none; background:none; border:1px solid var(--border); border-radius:6px;
  padding:4px 10px; font-size:18px; cursor:pointer; color:var(--text); }
.search-box { flex:1; max-width:400px; position:relative; }
.search-box input { width:100%; padding:6px 12px; border:1px solid var(--border); border-radius:6px;
  background:var(--bg2); color:var(--text); font-size:14px; outline:none; }
.search-box input:focus { border-color:var(--accent); box-shadow:0 0 0 3px var(--accent2); }
.search-results { position:absolute; top:100%; left:0; right:0; background:var(--bg);
  border:1px solid var(--border); border-radius:var(--radius); box-shadow:var(--shadow);
  max-height:400px; overflow-y:auto; display:none; z-index:200; }
.search-results.visible { display:block; }
.search-results a { display:block; padding:8px 12px; color:var(--text); text-decoration:none;
  font-size:14px; border-bottom:1px solid var(--border); }
.search-results a:hover { background:var(--accent2); }
.search-results a:last-child { border-bottom:none; }
.search-results .no-results { padding:12px; color:var(--muted); font-size:14px; }
.theme-toggle { background:none; border:1px solid var(--border); border-radius:6px;
  padding:4px 10px; font-size:18px; cursor:pointer; margin-left:12px; color:var(--text); }
.content { max-width:820px; margin:0 auto; padding:32px 40px 80px; }
.content h1 { font-size:2em; margin:0 0 16px; border-bottom:1px solid var(--border); padding-bottom:8px; }
.content h2 { font-size:1.5em; margin:32px 0 12px; border-bottom:1px solid var(--border); padding-bottom:6px; }
.content h3 { font-size:1.25em; margin:24px 0 8px; }
.content h4 { font-size:1em; margin:20px 0 6px; }
.content p { margin:0 0 16px; }
.content ul, .content ol { margin:0 0 16px; padding-left:2em; }
.content li { margin:4px 0; }
.content li>p { margin:4px 0; }
.content a { color:var(--accent); text-decoration:none; }
.content a:hover { text-decoration:underline; }
.content blockquote { margin:0 0 16px; padding:8px 16px; border-left:4px solid var(--accent);
  background:var(--bg2); border-radius:0 var(--radius) var(--radius) 0; color:var(--muted); }
.content table { width:100%; border-collapse:collapse; margin:0 0 16px; font-size:14px; }
.content th, .content td { padding:8px 12px; border:1px solid var(--border); text-align:left; }
.content th { background:var(--bg2); font-weight:600; }
.content code { font-family:"SFMono-Regular",Consolas,"Liberation Mono",Menlo,monospace;
  font-size:.875em; background:var(--code-bg); border:1px solid var(--code-border); border-radius:4px; padding:2px 6px; }
.content pre { margin:0 0 16px; padding:16px; background:var(--code-bg); border:1px solid var(--code-border);
  border-radius:var(--radius); overflow-x:auto; font-size:14px; line-height:1.5; }
.content pre code { background:none; border:none; padding:0; font-size:inherit; }
.content img { max-width:100%; border-radius:var(--radius); }
.content hr { border:none; border-top:1px solid var(--border); margin:32px 0; }
@media(max-width:768px){
  .sidebar { transform:translateX(-100%); transition:transform .25s ease; width:280px; }
  .sidebar.open { transform:translateX(0); box-shadow:4px 0 20px rgba(0,0,0,.2); }
  .sidebar-close { display:block; }
  .main { margin-left:0; }
  .menu-btn { display:block; }
  .content { padding:24px 16px 60px; } }
@media print { .sidebar, .topbar { display:none !important; } .main { margin-left:0; } }