:root{--brand:#1f5a87;--brand-deep:#123a5a;--accent:#c8102e;--ink:#12181f;--muted:#5a6b7c;--bg:#f6f8fa;--card:#fff;--line:#dbe3ea}
@media(prefers-color-scheme:dark){:root{--ink:#e8eef4;--muted:#a3b2c0;--bg:#0e1319;--card:#161d25;--line:#26303a;--brand:#74b6e8;--brand-deep:#0c2740}}
*{box-sizing:border-box}
body{margin:0;font:16px/1.65 -apple-system,BlinkMacSystemFont,"Segoe UI",Roboto,Helvetica,Arial,sans-serif;color:var(--ink);background:var(--bg)}
header{background:linear-gradient(160deg,var(--brand-deep),var(--brand));color:#fff;padding:44px 20px 38px}
header .wrap{max-width:820px;margin:0 auto;display:flex;gap:18px;align-items:center;flex-wrap:wrap}
header img{width:76px;height:76px;border-radius:18px;display:block}
header h1{margin:0;font-size:1.6rem;letter-spacing:-.01em}
header p{margin:6px 0 0;opacity:.92;font-size:.98rem}
nav{background:var(--card);border-bottom:1px solid var(--line);position:sticky;top:0;z-index:5}
nav .wrap{max-width:820px;margin:0 auto;padding:12px 20px;display:flex;gap:18px;flex-wrap:wrap}
nav a{color:var(--brand);text-decoration:none;font-weight:600;font-size:.94rem}
nav a:hover{text-decoration:underline}
main{max-width:820px;margin:0 auto;padding:30px 20px 70px}
h2{font-size:1.24rem;margin:34px 0 10px;letter-spacing:-.01em}
h3{font-size:1.02rem;margin:22px 0 6px}
p,li{color:var(--ink)}
.muted{color:var(--muted);font-size:.92rem}
.card{background:var(--card);border:1px solid var(--line);border-radius:14px;padding:18px 20px;margin:16px 0}
.badge{display:inline-block;background:var(--accent);color:#fff;border-radius:999px;padding:3px 10px;font-size:.76rem;font-weight:700;letter-spacing:.02em}
table{width:100%;border-collapse:collapse;margin:14px 0;font-size:.94rem;display:block;overflow-x:auto}
th,td{border:1px solid var(--line);padding:9px 11px;text-align:left;vertical-align:top}
th{background:rgba(31,90,135,.08);font-weight:700}
a{color:var(--brand)}
footer{border-top:1px solid var(--line);padding:26px 20px;color:var(--muted);font-size:.88rem}
footer .wrap{max-width:820px;margin:0 auto}
ul{padding-left:22px}
code{background:rgba(31,90,135,.1);padding:2px 5px;border-radius:4px;font-size:.9em}