:root{--bg:#f7f8fb;--surface:#fff;--text:#1a1f2e;--muted:#5a6274;--brand:#4b3fd1;--brand-dark:#372ca8;--border:#e2e5ee;--radius:12px;--max:46rem}
@media (prefers-color-scheme:dark){:root{--bg:#10131c;--surface:#181c28;--text:#e8ebf3;--muted:#a3abbd;--brand:#8f86ff;--brand-dark:#b3adff;--border:#2a3042}}
*{box-sizing:border-box}
html{-webkit-text-size-adjust:100%}
body{margin:0;font:1rem/1.65 system-ui,-apple-system,"Segoe UI",Roboto,"Helvetica Neue",Arial,sans-serif;background:var(--bg);color:var(--text)}
a{color:var(--brand)}a:hover{color:var(--brand-dark)}
a:focus-visible,.btn:focus-visible{outline:3px solid var(--brand);outline-offset:2px}
.skip{position:absolute;left:-999px;top:0;background:var(--surface);padding:.5rem 1rem}.skip:focus{left:1rem;top:1rem;z-index:10}
.wrap{max-width:var(--max);margin:0 auto;padding:0 1.25rem}
header.site{background:var(--surface);border-bottom:1px solid var(--border)}
header.site .wrap{display:flex;flex-wrap:wrap;align-items:center;justify-content:space-between;gap:.75rem;padding-top:.9rem;padding-bottom:.9rem}
.brand{font-weight:700;font-size:1.15rem;text-decoration:none;color:var(--text)}.brand span{color:var(--brand)}
nav ul{list-style:none;margin:0;padding:0;display:flex;flex-wrap:wrap;gap:1rem}
nav a{text-decoration:none;color:var(--muted)}nav a[aria-current=page],nav a:hover{color:var(--brand)}
main{padding:2.5rem 0 3rem}
.eyebrow{text-transform:uppercase;letter-spacing:.08em;font-size:.8rem;font-weight:600;color:var(--brand);margin:0}
h1{font-size:clamp(1.8rem,4vw,2.4rem);line-height:1.2;margin:.25rem 0 .75rem}
h2{font-size:1.35rem;margin:2.25rem 0 .5rem;scroll-margin-top:1rem}h3{font-size:1.1rem;margin:1.5rem 0 .4rem}
.lead{font-size:1.15rem;color:var(--muted)}
.card{background:var(--surface);border:1px solid var(--border);border-radius:var(--radius);padding:1.25rem 1.5rem;margin:1.25rem 0}
.cards{display:grid;gap:1rem;grid-template-columns:repeat(auto-fit,minmax(13rem,1fr))}.cards .card{margin:0}
.cards h2{font-size:1.1rem;margin-top:0}
.btn{display:inline-block;padding:.6rem 1.1rem;border-radius:8px;background:var(--brand);color:#fff;text-decoration:none;font-weight:600;margin:.25rem .5rem .25rem 0}
.btn:hover{background:var(--brand-dark);color:#fff}.btn.secondary{background:transparent;color:var(--brand);border:1px solid var(--brand)}
dl.facts{display:grid;grid-template-columns:max-content 1fr;gap:.35rem 1rem;margin:0}dl.facts dt{font-weight:600}dl.facts dd{margin:0}
pre{background:var(--surface);border:1px solid var(--border);border-radius:8px;padding:1rem;overflow-x:auto}code{font-family:ui-monospace,SFMono-Regular,Menlo,Consolas,monospace;font-size:.92em}
.toc{columns:2;padding-left:1.2rem}
.muted{color:var(--muted)}
details{border-bottom:1px solid var(--border);padding:.6rem 0}summary{cursor:pointer;font-weight:600}
footer.site{border-top:1px solid var(--border);background:var(--surface);padding:1.5rem 0;font-size:.9rem;color:var(--muted)}
footer.site ul{list-style:none;padding:0;margin:0 0 .5rem;display:flex;flex-wrap:wrap;gap:1rem}
@media (max-width:30rem){.toc{columns:1}dl.facts{grid-template-columns:1fr}dl.facts dd{margin-bottom:.4rem}}