:root{--bg:#f5f5f7;--card:#fff;--text:#1d1d1f;--muted:#6e6e73;--line:#e5e5ea;--link:#0066cc;--head:#f0f0f5}
@media (prefers-color-scheme:dark){:root{--bg:#111113;--card:#1c1c1e;--text:#f2f2f7;--muted:#a1a1a6;--line:#38383a;--link:#4da3ff;--head:#26262a}}
*{box-sizing:border-box}
body{margin:0;background:var(--bg);color:var(--text);font-family:-apple-system,BlinkMacSystemFont,'Segoe UI',Roboto,Helvetica,Arial,sans-serif;line-height:1.6;-webkit-font-smoothing:antialiased}
.doc{max-width:780px;margin:0 auto;padding:32px 16px 64px;background:var(--card);min-height:100vh}
@media (min-width:820px){.doc{margin:32px auto;border-radius:16px;padding:40px 48px 56px;min-height:0;box-shadow:0 1px 3px rgba(0,0,0,.06)}}
.brand{font-size:14px;color:var(--muted);margin:0 0 24px}
.brand a:first-child{font-weight:700;color:var(--text);text-decoration:none}
h1{font-size:30px;line-height:1.2;margin:0 0 4px;letter-spacing:-.3px}
h2{font-size:20px;margin:36px 0 10px;padding-top:8px;border-top:1px solid var(--line)}
h3{font-size:16px;margin:20px 0 8px}
.meta{color:var(--muted);font-size:14px;margin:0 0 20px}
.lead{font-size:17px}
a{color:var(--link)}
ul,ol{padding-left:22px}
li{margin:4px 0}
.toc{background:var(--head);border-radius:12px;padding:14px 18px;margin:20px 0}
.toc ol{margin:0;columns:2;column-gap:28px}
@media (max-width:560px){.toc ol{columns:1}}
table{width:100%;border-collapse:collapse;margin:12px 0;font-size:15px;display:block;overflow-x:auto}
@media (min-width:560px){table{display:table}}
th,td{text-align:left;vertical-align:top;padding:9px 10px;border-bottom:1px solid var(--line)}
th{background:var(--head);font-weight:600}