:root{--bg:#f7f8fa;--fg:#1d2433;--muted:#5b6475;--accent:#0f766e;--card:#fff;--line:#e3e6ec}
@media (prefers-color-scheme:dark){:root{--bg:#11151c;--fg:#e8ebf1;--muted:#a3abba;--accent:#2dd4bf;--card:#181e27;--line:#2a3240}}
*{box-sizing:border-box}html{-webkit-text-size-adjust:100%}
body{margin:0;background:var(--bg);color:var(--fg);font:16px/1.65 system-ui,-apple-system,"Segoe UI",Roboto,sans-serif}
header,main,footer{max-width:760px;margin:0 auto;padding:0 16px}
header{padding-top:28px;display:flex;justify-content:space-between;align-items:center;gap:12px;flex-wrap:wrap}
header a.brand{font-weight:700;color:var(--fg);text-decoration:none}
nav a{color:var(--muted);text-decoration:none;margin-left:16px;font-size:15px}
nav a:first-child{margin-left:0}
main{padding-top:32px;padding-bottom:48px}
h1{font-size:30px;line-height:1.25;margin:0 0 12px}
h2{font-size:20px;margin:32px 0 8px}
.muted{color:var(--muted)}
a{color:var(--accent)}
.card{background:var(--card);border:1px solid var(--line);border-radius:12px;padding:20px;margin:24px 0}
.card h2{margin-top:0}
ul{padding-left:20px}
footer{border-top:1px solid var(--line);padding-top:16px;padding-bottom:32px;font-size:14px;color:var(--muted)}
footer a{color:var(--muted)}