:root{
  --bg:#0b1020;--surface:#11182b;--surface-2:#17213a;--text:#e8edf7;--muted:#aab6cf;
  --line:#293654;--accent:#7dd3fc;--accent-2:#a7f3d0;--warn:#fcd34d;--danger:#fda4af;
  --code:#080d18;--shadow:0 16px 40px rgba(0,0,0,.24);--radius:16px;
}
*{box-sizing:border-box}html{scroll-behavior:smooth}body{margin:0;background:var(--bg);color:var(--text);font:16px/1.7 Inter,ui-sans-serif,system-ui,-apple-system,BlinkMacSystemFont,"Segoe UI",sans-serif}
a{color:var(--accent);text-decoration:none}a:hover{text-decoration:underline}code{font-family:"SFMono-Regular",Consolas,"Liberation Mono",monospace}
.app{display:grid;grid-template-columns:300px minmax(0,1fr);min-height:100vh}.sidebar{position:sticky;top:0;height:100vh;overflow:auto;border-right:1px solid var(--line);background:linear-gradient(180deg,#10172a,#0b1020);padding:24px 18px}.brand{display:flex;gap:12px;align-items:center;margin-bottom:22px}.brand-mark{width:42px;height:42px;border-radius:12px;display:grid;place-items:center;font-weight:900;color:#08101d;background:linear-gradient(135deg,var(--accent),var(--accent-2))}.brand strong{display:block}.brand small{color:var(--muted)}
.nav-section{margin:20px 0 8px;color:#7181a3;font-weight:700;font-size:12px;letter-spacing:.12em;text-transform:uppercase}.nav a{display:block;color:#cad5e9;padding:9px 11px;border-radius:10px;margin:2px 0}.nav a:hover,.nav a.active{background:var(--surface-2);text-decoration:none;color:#fff}.main{min-width:0}.topbar{position:sticky;top:0;z-index:20;display:flex;gap:12px;align-items:center;justify-content:space-between;padding:14px 28px;border-bottom:1px solid var(--line);background:rgba(11,16,32,.88);backdrop-filter:blur(14px)}.search{width:min(560px,100%);padding:10px 14px;border:1px solid var(--line);border-radius:12px;background:#0c1324;color:var(--text)}.top-actions{display:flex;gap:8px}.btn{border:1px solid var(--line);background:var(--surface);color:var(--text);border-radius:10px;padding:9px 12px;cursor:pointer}.btn:hover{border-color:#52658f}.content{max-width:1120px;margin:auto;padding:52px 42px 90px}.eyebrow{color:var(--accent-2);font-weight:800;text-transform:uppercase;letter-spacing:.14em;font-size:12px}.hero h1{font-size:clamp(34px,5vw,66px);line-height:1.05;margin:8px 0 18px;letter-spacing:-.04em}.hero p{font-size:19px;color:var(--muted);max-width:830px}.hero-grid,.card-grid{display:grid;grid-template-columns:repeat(2,minmax(0,1fr));gap:18px;margin:30px 0}.card{background:linear-gradient(180deg,var(--surface),#0e1628);border:1px solid var(--line);border-radius:var(--radius);padding:22px;box-shadow:var(--shadow)}.card h3{margin-top:0}.card p{color:var(--muted)}.pill{display:inline-flex;align-items:center;gap:7px;padding:5px 9px;border-radius:999px;background:#13243a;color:#bdeafe;font-size:13px;font-weight:700}.section{margin-top:54px}.section h2{font-size:30px;letter-spacing:-.02em;margin-bottom:8px}.section h3{margin-top:32px}.section>p,.lead{color:var(--muted)}.toc{padding:18px 20px;border:1px solid var(--line);border-radius:14px;background:#0d1425;margin:22px 0}.toc strong{display:block;margin-bottom:8px}.toc a{margin-right:14px;display:inline-block}
.command{border:1px solid var(--line);border-radius:16px;background:var(--surface);padding:22px;margin:20px 0}.command-head{display:flex;align-items:flex-start;justify-content:space-between;gap:14px}.command h3{margin:0;font-size:23px}.command .summary{color:var(--muted);margin:6px 0 14px}.doclink{white-space:nowrap;font-size:13px;border:1px solid #335170;border-radius:999px;padding:5px 9px;background:#0d1d31}.meta{display:grid;grid-template-columns:140px 1fr;gap:8px 14px;margin:14px 0}.meta dt{font-weight:800;color:#bcd0ed}.meta dd{margin:0;color:var(--muted)}
pre{position:relative;background:var(--code);border:1px solid #1e2a42;border-radius:14px;padding:18px;overflow:auto;box-shadow:inset 0 1px 0 rgba(255,255,255,.03)}pre code{color:#d9e4f7}.copy-btn{position:absolute;right:10px;top:10px;border:1px solid #2f405f;background:#101a2d;color:#c8d5ea;border-radius:8px;padding:5px 8px;font-size:12px;cursor:pointer}.note,.warning,.danger,.success{border-left:4px solid var(--accent);background:#0e1b2d;padding:14px 16px;border-radius:10px;margin:18px 0}.warning{border-color:var(--warn);background:#251f0e}.danger{border-color:var(--danger);background:#28151d}.success{border-color:var(--accent-2);background:#10241f}.kbd{display:inline-block;border:1px solid var(--line);border-bottom-width:3px;border-radius:6px;padding:0 6px;background:#12192b;font-family:monospace;font-size:13px}
table{width:100%;border-collapse:collapse;margin:18px 0;display:block;overflow:auto}th,td{border-bottom:1px solid var(--line);padding:11px 14px;text-align:left;vertical-align:top}th{color:#fff;background:#10182b;position:sticky;top:0}td{color:#c7d2e7}.steps{counter-reset:step;list-style:none;padding:0}.steps>li{counter-increment:step;position:relative;padding-left:52px;margin:18px 0}.steps>li:before{content:counter(step);position:absolute;left:0;top:0;width:34px;height:34px;border-radius:50%;display:grid;place-items:center;background:#18304a;color:#c8f1ff;font-weight:900}.lab{border:1px solid var(--line);border-radius:16px;padding:22px;margin:24px 0;background:linear-gradient(180deg,#121b2f,#0d1424)}.lab-header{display:flex;justify-content:space-between;gap:16px;align-items:flex-start}.difficulty{font-size:12px;padding:5px 9px;border-radius:999px;background:#152b25;color:#a7f3d0}.checkline{display:flex;gap:9px;align-items:center;margin:14px 0;color:#dce5f4}.checkline input{width:18px;height:18px}.pager{display:flex;justify-content:space-between;gap:15px;margin-top:60px;padding-top:26px;border-top:1px solid var(--line)}.pager a{border:1px solid var(--line);padding:10px 14px;border-radius:12px;background:var(--surface)}.footer{color:#7f8daa;font-size:13px;margin-top:50px}.hidden-by-search{display:none!important}.mobile-toggle{display:none}
@media(max-width:900px){.app{grid-template-columns:1fr}.sidebar{position:fixed;z-index:50;left:-320px;width:300px;transition:.2s}.sidebar.open{left:0;box-shadow:30px 0 80px #000}.mobile-toggle{display:inline-block}.content{padding:34px 20px 70px}.topbar{padding:12px 16px}.hero-grid,.card-grid{grid-template-columns:1fr}.meta{grid-template-columns:1fr}.meta dt{margin-top:6px}.command-head{display:block}.doclink{display:inline-block;margin-top:8px}}
@media print{.sidebar,.topbar,.copy-btn,.pager{display:none!important}.app{display:block}.content{max-width:none;padding:0}.card,.command,.lab{box-shadow:none;break-inside:avoid}body{background:#fff;color:#111}.section>p,.lead,.card p,.command .summary,.meta dd,td{color:#333}pre{background:#f5f5f5;border-color:#ddd}pre code{color:#111}a{color:#111;text-decoration:underline}}