:root{
  --bg:#f6f8fc;--surface:#fff;--text:#14213d;--muted:#64748b;--border:#dbe4f0;
  --primary:#2563eb;--primary-dark:#1e40af;--sidebar:#0f172a;--sidebar-text:#e2e8f0;
  --sidebar-muted:#94a3b8;--code-bg:#0b1220;--shadow:0 18px 45px rgba(15,23,42,.08);
}
html[data-theme="dark"]{
  --bg:#0b1120;--surface:#111827;--text:#e5edf8;--muted:#9fb0c8;--border:#26344d;
  --primary:#60a5fa;--primary-dark:#93c5fd;--sidebar:#070b14;--sidebar-text:#e0f2fe;
  --sidebar-muted:#8da2bd;--code-bg:#050816;--shadow:0 18px 45px rgba(0,0,0,.28);
}
*{box-sizing:border-box}
html{scroll-behavior:smooth}
body{margin:0;background:var(--bg);color:var(--text);font-family:Inter,ui-sans-serif,system-ui,-apple-system,BlinkMacSystemFont,"Segoe UI",sans-serif;line-height:1.75}
.layout{display:grid;grid-template-columns:320px 1fr;min-height:100vh}
main{min-width:0}
.sidebar{position:sticky;top:0;height:100vh;overflow-y:auto;background:var(--sidebar);color:var(--sidebar-text);padding:22px 18px;z-index:20;transition:transform .25s ease}
.brand{display:flex;align-items:center;gap:12px;padding:12px;border-radius:16px;background:rgba(255,255,255,.06);margin-bottom:22px}
.logo{width:42px;height:42px;border-radius:14px;background:linear-gradient(135deg,#2563eb,#38bdf8);display:grid;place-items:center;font-weight:900}
.brand strong{display:block;line-height:1.2}
.brand span{display:block;color:var(--sidebar-muted);font-size:12px}
.nav-title{margin:22px 10px 10px;color:var(--sidebar-muted);font-size:11px;text-transform:uppercase;letter-spacing:.12em}
.nav-group{margin-bottom:8px}
.nav-module{display:block;width:100%;padding:10px 12px;border-radius:12px;color:#fff;text-decoration:none;font-weight:750}
.nav-module:hover,.nav-module.active{background:rgba(96,165,250,.18)}
.nav-sub{margin:4px 0 14px 18px}
.nav-sub a{display:block;padding:6px 10px;border-radius:10px;color:var(--sidebar-muted);text-decoration:none;font-size:13px}
.nav-sub a:hover{background:rgba(255,255,255,.08);color:#fff}
.topbar{position:sticky;top:0;z-index:10;display:flex;justify-content:space-between;align-items:center;gap:12px;padding:15px 28px;background:color-mix(in srgb,var(--surface) 88%,transparent);backdrop-filter:blur(14px);border-bottom:1px solid var(--border)}
.topbar-left{display:flex;align-items:center;gap:12px;min-width:0}
.page-title{font-weight:800;white-space:nowrap;overflow:hidden;text-overflow:ellipsis}
.btn{border:1px solid var(--border);background:var(--surface);color:var(--text);border-radius:12px;padding:9px 12px;cursor:pointer;text-decoration:none;font-size:14px}
.btn:hover{border-color:var(--primary)}
#menuToggle{display:none}
.content{max-width:1060px;margin:0 auto;padding:34px 28px 70px}
.hero{background:linear-gradient(135deg,var(--primary),#0ea5e9);color:white;border-radius:26px;padding:36px;margin-bottom:26px;box-shadow:var(--shadow);position:relative;overflow:hidden}
.hero:after{content:"";position:absolute;right:-80px;top:-80px;width:240px;height:240px;border-radius:999px;background:rgba(255,255,255,.14)}
.hero h1{margin:0 0 8px;font-size:clamp(30px,4vw,48px);line-height:1.1}
.hero p{margin:0;color:rgba(255,255,255,.88);max-width:720px}
.card{background:var(--surface);border:1px solid var(--border);border-radius:26px;padding:34px;box-shadow:var(--shadow)}
.card h2{margin-top:42px;padding-top:10px;border-top:1px solid var(--border);font-size:26px;line-height:1.25}
.card h2:first-child{margin-top:0;border-top:0}
.card h3{margin-top:28px}
.card img{max-width:100%;border-radius:18px;border:1px solid var(--border);box-shadow:0 16px 42px rgba(15,23,42,.10);margin:14px 0 24px}
.card a{color:var(--primary);text-decoration:none}
.card a:hover{text-decoration:underline}
.card blockquote{border-left:4px solid var(--primary);background:color-mix(in srgb,var(--primary) 8%,var(--surface));margin:22px 0;padding:12px 18px;border-radius:0 14px 14px 0;color:var(--muted)}
.card table{width:100%;border-collapse:collapse;margin:18px 0 26px;border-radius:14px;overflow:hidden}
.card th,.card td{border:1px solid var(--border);padding:11px 13px;text-align:left;vertical-align:top}
.card th{background:color-mix(in srgb,var(--primary) 8%,var(--surface))}
.card code:not(pre code){background:color-mix(in srgb,var(--primary) 8%,var(--surface));color:var(--primary-dark);padding:2px 7px;border-radius:7px;font-size:.92em}
.code-block{position:relative;margin:20px 0 28px;border-radius:18px;overflow:hidden;background:var(--code-bg);border:1px solid rgba(148,163,184,.18)}
.code-toolbar{display:flex;justify-content:space-between;align-items:center;padding:10px 12px;background:rgba(255,255,255,.06);border-bottom:1px solid rgba(148,163,184,.18)}
.code-lang{color:#93c5fd;font-size:12px;text-transform:uppercase;letter-spacing:.08em}
.copy-code{border:1px solid rgba(255,255,255,.15);background:rgba(255,255,255,.08);color:#e0f2fe;border-radius:10px;padding:6px 9px;cursor:pointer;font-size:12px}
.copy-code:hover{background:rgba(255,255,255,.14)}
pre{margin:0;overflow-x:auto;padding:18px;background:var(--code-bg);color:#dbeafe}
pre code{font-family:"JetBrains Mono","Fira Code",Consolas,monospace;font-size:14px;line-height:1.65}
.footer{max-width:1060px;margin:0 auto;padding:0 28px 34px;color:var(--muted);font-size:13px}
.home-grid{display:grid;grid-template-columns:repeat(auto-fit,minmax(240px,1fr));gap:18px;margin-top:22px}
.home-card{display:block;padding:22px;border-radius:20px;background:var(--surface);border:1px solid var(--border);text-decoration:none;color:var(--text);box-shadow:var(--shadow)}
.home-card strong{font-size:18px}
.home-card span{display:block;color:var(--muted);margin-top:6px}
.home-card:hover{border-color:var(--primary)}
@media(max-width:920px){
  .layout{grid-template-columns:1fr}
  .sidebar{position:fixed;left:0;transform:translateX(-105%);width:320px;max-width:86vw}
  #menuToggle{display:inline-flex;align-items:center;justify-content:center}
  .topbar{padding:14px 16px;align-items:flex-start}
  .topbar > div:last-child{display:flex;flex-wrap:wrap;justify-content:flex-end;gap:8px}
  .topbar-left{flex:1;min-width:0}
  .page-title{white-space:normal;line-height:1.3}
  body.sidebar-open .sidebar{transform:translateX(0)}
  .content{padding:24px 18px 54px}
  .card{padding:24px 18px}
  .hero{padding:28px 22px}
}
@media print{
  .sidebar,.topbar,.footer{display:none}
  .layout{display:block}
  body{background:#fff}
  .content{max-width:none;padding:0}
  .card,.hero{box-shadow:none;border:0}
}