:root{--ink:#17202b;--muted:#5d6876;--line:#e3e7ec;--bg:#f6f8fa;--card:#fff;--accent:#0d4f8b}
@media (prefers-color-scheme:dark){:root{--ink:#e8edf2;--muted:#9aa6b4;--line:#2a333d;--bg:#11161c;--card:#171e26;--accent:#6fb0ee}}
*{box-sizing:border-box}
body{margin:0;background:var(--bg);color:var(--ink);font:16px/1.6 -apple-system,BlinkMacSystemFont,"Segoe UI",Roboto,Helvetica,Arial,sans-serif}
a{color:var(--accent)}
header{border-bottom:1px solid var(--line);background:var(--card)}
.bar{max-width:760px;margin:0 auto;padding:14px 20px;display:flex;align-items:center;gap:18px}
.brand{font-weight:700;font-size:18px;color:var(--ink);text-decoration:none;flex:1}
.bar nav a{color:var(--muted);text-decoration:none;font-size:15px;margin-left:16px}
.bar nav a:hover{color:var(--ink)}
main{max-width:760px;margin:0 auto;padding:28px 20px 48px}
h1{font-size:30px;line-height:1.2;margin:8px 0 10px}
h2{font-size:19px;margin:30px 0 8px}
.lead{font-size:18px;color:var(--muted);margin:0 0 22px}
.card{background:var(--card);border:1px solid var(--line);border-radius:12px;padding:18px 20px;margin:14px 0}
.grid{display:grid;grid-template-columns:repeat(auto-fit,minmax(210px,1fr));gap:12px;margin:18px 0}
.grid .card{margin:0}
.grid b{display:block;margin-bottom:4px}
.grid p{margin:0;color:var(--muted);font-size:15px}
ul,ol{padding-left:22px}
li{margin:4px 0}
.small{font-size:14px;color:var(--muted)}
footer{max-width:760px;margin:0 auto;padding:0 20px 36px;font-size:14px;color:var(--muted)}
footer a{color:var(--muted);margin-right:14px}