:root{
  --bg:#0f1419; --bg-soft:#161d26; --panel:#1b2430; --text:#e6edf3; --muted:#9aa7b4;
  --line:#26313d; --accent:#4f9cf9; --accent-2:#22d3a6; --code-bg:#0b0f14;
  --sidebar:#121922; --max:1200px;
}
:root.light{
  --bg:#f6f8fb; --bg-soft:#ffffff; --panel:#ffffff; --text:#1c2430; --muted:#5b6776;
  --line:#e2e8f0; --accent:#2563eb; --accent-2:#0ea472; --code-bg:#0f172a; --sidebar:#ffffff;
}
*{box-sizing:border-box}
html{scroll-behavior:smooth}
body{margin:0;background:var(--bg);color:var(--text);
  font-family:-apple-system,BlinkMacSystemFont,"Segoe UI",Roboto,"PingFang SC","Microsoft YaHei",sans-serif;
  line-height:1.75;font-size:15.5px;}
a{color:var(--accent);text-decoration:none}
a:hover{text-decoration:underline}
.layout{display:flex;min-height:100vh}
.sidebar{width:280px;flex:0 0 280px;background:var(--sidebar);border-right:1px solid var(--line);
  position:sticky;top:0;height:100vh;overflow-y:auto;padding:18px 14px}
.brand{display:flex;align-items:center;gap:10px;padding:6px 8px 16px;font-weight:700;font-size:17px}
.brand .logo{width:26px;height:26px;border-radius:7px;background:linear-gradient(135deg,var(--accent),var(--accent-2));display:inline-block}
.search{margin:0 4px 14px}
.search input{width:100%;padding:9px 11px;border-radius:9px;border:1px solid var(--line);background:var(--bg);color:var(--text);outline:none;font-size:14px}
.search input:focus{border-color:var(--accent)}
.navgroup{margin:14px 0 4px;padding:0 8px;font-size:12px;letter-spacing:.08em;color:var(--muted);text-transform:uppercase}
.nav a{display:block;padding:8px 10px;border-radius:8px;color:var(--text);font-size:14.5px;margin:1px 2px}
.nav a:hover{background:var(--bg-soft);text-decoration:none}
.nav a.active{background:linear-gradient(90deg,rgba(79,156,249,.18),transparent);color:var(--accent);font-weight:600;border-left:2px solid var(--accent)}
.main{flex:1;min-width:0;display:flex;flex-direction:column}
.topbar{position:sticky;top:0;z-index:20;display:flex;align-items:center;justify-content:space-between;padding:12px 26px;background:color-mix(in srgb,var(--bg) 88%,transparent);backdrop-filter:blur(8px);border-bottom:1px solid var(--line)}
.topbar .crumb{color:var(--muted);font-size:13.5px}
.topbar .actions{display:flex;gap:10px;align-items:center}
.btn{cursor:pointer;border:1px solid var(--line);background:var(--panel);color:var(--text);padding:7px 12px;border-radius:8px;font-size:13.5px}
.btn:hover{border-color:var(--accent)}
.content{max-width:var(--max);width:100%;margin:0 auto;padding:34px 44px 100px}
.content h1{font-size:31px;margin:.2em 0 .5em;letter-spacing:-.01em}
.content h2{font-size:22px;margin:1.8em 0 .6em;padding-top:.3em;border-top:1px solid var(--line)}
.content h2:first-of-type{border-top:none}
.content h3{font-size:17.5px;margin:1.2em 0 .4em}
.lead{font-size:17px;color:var(--muted)}
.content p{margin:.7em 0}
.content ul,.content ol{padding-left:1.4em}
.content li{margin:.35em 0}
.code{background:var(--code-bg);color:#e6edf3;border:1px solid var(--line);border-radius:10px;padding:14px 16px;overflow:auto;font-size:13.5px;line-height:1.62;margin:14px 0}
.code code{font-family:"SFMono-Regular",Consolas,"Liberation Mono",Menlo,monospace;white-space:pre}
code{font-family:"SFMono-Regular",Consolas,"Liberation Mono",Menlo,monospace;background:rgba(127,127,127,.16);padding:1px 6px;border-radius:5px;font-size:.9em}
.tbl-wrap{overflow:auto;margin:14px 0;border:1px solid var(--line);border-radius:10px}
table{border-collapse:collapse;width:100%;font-size:14px}
th,td{text-align:left;padding:9px 13px;border-bottom:1px solid var(--line);vertical-align:top}
th{background:var(--bg-soft);font-weight:600;color:var(--muted)}
tr:last-child td{border-bottom:none}
.callout{display:flex;gap:10px;padding:12px 14px;border-radius:10px;margin:14px 0;font-size:14.5px;border:1px solid var(--line);background:var(--bg-soft)}
.callout .ct{flex:0 0 auto;font-weight:700;font-size:13px;padding:1px 8px;border-radius:6px;height:fit-content;background:rgba(79,156,249,.18);color:var(--accent)}
.callout.tip .ct{background:rgba(34,211,166,.16);color:var(--accent-2)}
.callout.warn .ct{background:rgba(245,158,11,.18);color:#f59e0b}
.callout.danger .ct{background:rgba(239,68,68,.18);color:#ef4444}
details{border:1px solid var(--line);border-radius:10px;padding:10px 14px;margin:10px 0;background:var(--bg-soft)}
details summary{cursor:pointer;font-weight:600}
details[open] summary{margin-bottom:6px}
footer.foot{border-top:1px solid var(--line);color:var(--muted);font-size:13px;padding:20px 40px;text-align:center}
.search-panel{position:fixed;inset:0;background:rgba(0,0,0,.5);display:none;z-index:100;padding-top:12vh}
.search-panel.open{display:block}
.search-box{max-width:660px;margin:0 auto;background:var(--panel);border:1px solid var(--line);border-radius:14px;overflow:hidden;box-shadow:0 20px 60px rgba(0,0,0,.4)}
.search-box input{width:100%;border:none;padding:16px 18px;font-size:16px;background:transparent;color:var(--text);outline:none}
.search-results{max-height:52vh;overflow:auto}
.search-results a{display:block;padding:11px 18px;border-top:1px solid var(--line);color:var(--text)}
.search-results a small{color:var(--muted);display:block}
@media (max-width:860px){
  .sidebar{position:fixed;left:-300px;z-index:60;transition:left .2s}
  .sidebar.open{left:0}
  .content{padding:22px 18px 80px}
  .menu-btn{display:inline-block!important}
}
@media print{.sidebar,.topbar{display:none}.content{max-width:none}}