:root{color-scheme:light dark;--bg:#fff;--fg:#141414;--muted:#555;--line:#e5e5e5;--accent:#0a7d4f}
@media (prefers-color-scheme:dark){:root{--bg:#0b0b0b;--fg:#f2f2f2;--muted:#b5b5b5;--line:#2a2a2a;--accent:#4fd69c}}
*{box-sizing:border-box}
body{margin:0;background:var(--bg);color:var(--fg);font:17px/1.6 -apple-system,BlinkMacSystemFont,"Segoe UI",Roboto,Helvetica,Arial,sans-serif;-webkit-text-size-adjust:100%}
header,main,footer{max-width:720px;margin:0 auto;padding:0 20px}
header{display:flex;flex-wrap:wrap;gap:8px 20px;align-items:center;padding-top:24px;padding-bottom:16px;border-bottom:1px solid var(--line)}
header .brand{font-weight:700;font-size:20px;color:var(--fg);text-decoration:none;margin-right:auto}
nav a{margin-left:16px}
nav a:first-child{margin-left:0}
a{color:var(--accent)}
h1{font-size:30px;line-height:1.2;margin:32px 0 4px}
h2{font-size:20px;margin:32px 0 8px}
h3{font-size:17px;margin:20px 0 4px}
.meta{color:var(--muted);margin:0 0 24px}
ul{padding-left:22px}
li{margin:4px 0}
.callout{border:1px solid var(--line);border-radius:10px;padding:14px 16px;margin:20px 0}
footer{margin-top:48px;padding-top:20px;padding-bottom:40px;border-top:1px solid var(--line);color:var(--muted);font-size:14px}