:root{--brand:#0093AD;--ink:#1d2939;--muted:#5d6b7e;--line:#e4e7ec;--bg:#fff;--soft:#f2f9fb}
@media (prefers-color-scheme:dark){:root{--ink:#e6eaf0;--muted:#a3adbb;--line:#2b3442;--bg:#11161d;--soft:#16212b}}
*{box-sizing:border-box}
body{margin:0;background:var(--bg);color:var(--ink);font:16px/1.7 "Poppins",system-ui,-apple-system,"Segoe UI",Roboto,sans-serif}
header{background:var(--brand);color:#fff;padding:28px 16px}
header .w,main{max-width:820px;margin:0 auto}
header a{color:#fff}
header h1{margin:6px 0 0;font-size:1.6rem;line-height:1.3}
nav{font-size:.9rem;opacity:.95}
nav a{margin-right:14px}
main{padding:24px 16px 64px}
h2{margin-top:2.2em;padding-top:.4em;border-top:1px solid var(--line);font-size:1.2rem}
h3{font-size:1.02rem;margin-bottom:.3em}
a{color:var(--brand)}
.meta{color:var(--muted);font-size:.9rem}
.note{background:var(--soft);border-left:4px solid var(--brand);padding:12px 16px;border-radius:6px}
table{width:100%;border-collapse:collapse;font-size:.92rem;margin:12px 0;display:block;overflow-x:auto}
th,td{border:1px solid var(--line);padding:8px 10px;text-align:left;vertical-align:top}
th{background:var(--soft)}
ol,ul{padding-left:1.4em}
li{margin:.25em 0}
.toc{columns:2;font-size:.92rem}
@media (max-width:600px){.toc{columns:1}}
footer{border-top:1px solid var(--line);color:var(--muted);font-size:.85rem;text-align:center;padding:20px 16px}