:root{--bg:#fff;--fg:#0f172a;--muted:#475569;--card:#f8fafc;--border:#e2e8f0;--accent:#2563eb;--accent2:#0891b2;--navy:#070d1f;--code:#f1f5f9;--ok:#ecfeff;--warn:#fffbeb}
@media (prefers-color-scheme:dark){:root{--bg:#0b1020;--fg:#e5e7eb;--muted:#94a3b8;--card:#111a33;--border:#1e2a4a;--accent:#60a5fa;--accent2:#22d3ee;--code:#0f1830;--ok:#0b2a35;--warn:#2a2410}}
*{box-sizing:border-box}html{scroll-behavior:smooth;-webkit-text-size-adjust:100%}
body{margin:0;background:var(--bg);color:var(--fg);font:17px/1.7 system-ui,-apple-system,"Segoe UI",Roboto,Helvetica,Arial,sans-serif}
a{color:var(--accent);text-underline-offset:3px}a:hover{color:var(--accent2)}
img,svg{max-width:100%;height:auto}
.skip{position:absolute;left:-999px}.skip:focus{left:8px;top:8px;background:#fff;color:#000;padding:8px;z-index:9}
.wrap{max-width:1120px;margin:0 auto;padding:0 20px}.narrow{max-width:760px;margin:0 auto;padding:0 20px}
header.site{background:var(--navy);color:#fff;position:sticky;top:0;z-index:5}
header.site .wrap{display:flex;align-items:center;gap:20px;min-height:60px;flex-wrap:wrap}
.brand{display:flex;align-items:center;gap:10px;color:#fff;text-decoration:none;font-weight:800;letter-spacing:.2px}
.brand img{width:28px;height:28px}
nav.main{display:flex;gap:4px;flex-wrap:wrap;margin-left:auto}
nav.main a{color:#cbd5e1;text-decoration:none;padding:8px 10px;border-radius:8px;font-size:15px;font-weight:600}
nav.main a:hover,nav.main a[aria-current]{color:#fff;background:#13214a}
.hero{background:linear-gradient(135deg,#070d1f,#0b2a55);color:#fff;padding:64px 0 56px}
.hero h1{font-size:clamp(2rem,5vw,3.4rem);line-height:1.1;margin:0 0 14px;letter-spacing:-.02em}
.hero p{color:#cbd5e1;font-size:1.15rem;max-width:640px;margin:0 0 24px}
.hero em{font-style:normal;background:linear-gradient(90deg,#60a5fa,#22d3ee);-webkit-background-clip:text;background-clip:text;color:transparent}
form.search{display:flex;gap:8px;max-width:520px}
form.search input{flex:1;padding:12px 14px;border-radius:10px;border:1px solid #1e3a6e;background:#0c1733;color:#fff;font-size:16px}
form.search button,.btn{background:linear-gradient(90deg,#2563eb,#0891b2);color:#fff;border:0;border-radius:10px;padding:12px 18px;font-weight:700;font-size:16px;cursor:pointer;text-decoration:none;display:inline-block}
section.block{padding:44px 0}section.block h2{font-size:1.6rem;margin:0 0 6px;letter-spacing:-.01em}
.sub{color:var(--muted);margin:0 0 22px}
.grid{display:grid;gap:16px;grid-template-columns:repeat(auto-fill,minmax(250px,1fr))}
.card{display:block;background:var(--card);border:1px solid var(--border);border-radius:14px;padding:18px;text-decoration:none;color:var(--fg);transition:transform .15s,border-color .15s}
.card:hover{transform:translateY(-2px);border-color:var(--accent)}
.card h3{margin:6px 0 6px;font-size:1.05rem;line-height:1.3}.card p{margin:0;color:var(--muted);font-size:.93rem;line-height:1.5}
.kicker{font-size:.72rem;font-weight:800;letter-spacing:.12em;text-transform:uppercase;color:var(--accent2)}
.badge{display:inline-block;font-size:.7rem;font-weight:800;letter-spacing:.06em;text-transform:uppercase;background:linear-gradient(90deg,#2563eb,#0891b2);color:#fff;border-radius:99px;padding:2px 9px;margin-left:6px}
.qa{display:grid;gap:14px;grid-template-columns:repeat(auto-fit,minmax(300px,1fr))}
.qa div{background:var(--card);border:1px solid var(--border);border-radius:14px;padding:18px}.qa h3{margin:0 0 8px;font-size:1.05rem}.qa p{margin:0 0 8px}
.crumbs{font-size:.88rem;color:var(--muted);padding:18px 0 0}.crumbs a{color:var(--muted)}
article h1{font-size:clamp(1.9rem,4.6vw,2.7rem);line-height:1.15;letter-spacing:-.02em;margin:10px 0 10px}
.meta{color:var(--muted);font-size:.9rem;margin:0 0 18px}
.carousel{margin:26px 0}.car-head{display:flex;align-items:center;justify-content:space-between;gap:12px}.car-head h2{font-size:1.35rem;margin:0}
.car-btns{display:flex;gap:8px}.car-btns button{width:42px;height:42px;border-radius:50%;border:1px solid var(--border);background:var(--card);color:var(--fg);font-size:26px;line-height:1;cursor:pointer}.car-btns button:hover{border-color:var(--accent);color:var(--accent)}
.track{display:flex;gap:14px;overflow-x:auto;scroll-snap-type:x mandatory;scroll-behavior:smooth;margin-top:12px;padding-bottom:6px;outline-offset:3px}
.slide{flex:0 0 100%;scroll-snap-align:center;margin:0;border:1px solid var(--border);border-radius:14px;overflow:hidden;background:var(--card)}
.slide img{display:block;width:100%;height:auto;aspect-ratio:3/2;object-fit:cover}.slide figcaption{padding:10px 14px;font-size:.95rem;color:var(--muted)}
.car-note{font-size:.82rem;color:var(--muted);margin:8px 0 0}
.hero-img{border-radius:16px;border:1px solid var(--border);display:block;width:100%;margin:14px 0 22px}
.answer{background:var(--ok);border-left:5px solid var(--accent2);padding:16px 18px;border-radius:10px;font-size:1.08rem;margin:0 0 22px}
.answer b.lbl{display:block;font-size:.72rem;letter-spacing:.12em;text-transform:uppercase;color:var(--accent2);margin-bottom:4px}
.note{background:var(--warn);border:1px solid var(--border);border-radius:10px;padding:10px 14px;font-size:.9rem;color:var(--muted);margin:0 0 22px}
nav.toc{border:1px solid var(--border);border-radius:12px;padding:12px 16px;margin:0 0 28px;background:var(--card)}
nav.toc summary{font-weight:800;cursor:pointer}nav.toc ol{margin:10px 0 0;padding-left:20px;columns:2;column-gap:28px}nav.toc li{break-inside:avoid;margin:2px 0;font-size:.95rem}
.prose h2{font-size:1.55rem;line-height:1.25;margin:2.2em 0 .5em;letter-spacing:-.01em;scroll-margin-top:80px}
.prose h3{font-size:1.2rem;margin:1.6em 0 .4em;scroll-margin-top:80px}
.prose p,.prose li{max-width:70ch}.prose ul,.prose ol{padding-left:1.3em}
.prose blockquote{border-left:4px solid var(--border);margin:1em 0;padding:.2em 1em;color:var(--muted)}
.table-wrap{overflow-x:auto;margin:1.2em 0;border:1px solid var(--border);border-radius:12px}
table{border-collapse:collapse;width:100%;font-size:.93rem}th,td{padding:10px 12px;text-align:left;border-bottom:1px solid var(--border);vertical-align:top}
th{background:var(--card);font-size:.8rem;text-transform:uppercase;letter-spacing:.05em}tr:last-child td{border-bottom:0}
code,pre{font-family:ui-monospace,SFMono-Regular,Menlo,Consolas,monospace;background:var(--code);border-radius:8px}pre{padding:12px 14px;overflow-x:auto}code{padding:1px 5px}pre code{padding:0}
pre.formula{border-left:4px solid var(--accent)}
.related{margin-top:48px;border-top:1px solid var(--border);padding-top:24px}
footer.site{background:var(--navy);color:#94a3b8;margin-top:56px;padding:36px 0;font-size:.92rem}
footer.site a{color:#cbd5e1}footer.site .cols{display:grid;gap:24px;grid-template-columns:repeat(auto-fit,minmax(200px,1fr))}
footer.site h4{color:#fff;margin:0 0 8px}footer.site ul{list-style:none;padding:0;margin:0}footer.site li{margin:4px 0}
dl.gloss dt{font-weight:800;margin-top:1.2em;scroll-margin-top:80px}dl.gloss dd{margin:.2em 0 0;max-width:70ch}
.pill-row{display:flex;flex-wrap:wrap;gap:8px;margin:0 0 22px}.pill-row a{border:1px solid var(--border);border-radius:99px;padding:4px 12px;text-decoration:none;font-size:.9rem;background:var(--card)}
#results .card{margin-bottom:12px}
@media (max-width:640px){body{font-size:16px}nav.toc ol{columns:1}.hero{padding:40px 0}}
@media print{header.site,footer.site,nav.toc,.related{display:none}}