:root{--bg:#f6f7f9;--card:#fff;--ink:#1c2430;--muted:#5d6b7c;--line:#e3e7ec;--accent:#0b6e4f}
@media (prefers-color-scheme:dark){:root{--bg:#12161c;--card:#1a2029;--ink:#e8edf3;--muted:#9aa7b6;--line:#2a323d;--accent:#4cc79c}}
*{box-sizing:border-box}body{margin:0;background:var(--bg);color:var(--ink);font:16px/1.6 system-ui,-apple-system,"Segoe UI",Tahoma,Arial,sans-serif}
header,main,footer{max-width:860px;margin:0 auto;padding:0 20px}
header{display:flex;flex-wrap:wrap;gap:12px;align-items:center;justify-content:space-between;padding-top:22px;padding-bottom:22px}
.brand{font-weight:700;font-size:1.15rem;color:var(--ink);text-decoration:none}
nav a{color:var(--muted);text-decoration:none;margin-inline-start:18px}nav a:hover,nav a[aria-current]{color:var(--accent)}
.card{background:var(--card);border:1px solid var(--line);border-radius:12px;padding:26px;margin:0 0 18px}
h1{font-size:1.7rem;line-height:1.25;margin:0 0 10px}h2{font-size:1.15rem;margin:0 0 8px}p{margin:0 0 12px}
.muted{color:var(--muted)}.grid{display:grid;gap:18px;grid-template-columns:repeat(auto-fit,minmax(230px,1fr))}
footer{color:var(--muted);font-size:.9rem;padding-top:8px;padding-bottom:36px}