:root{--bg:#ffffff;--fg:#1c2530;--muted:#5b6673;--accent:#0b7a5a;--line:#e3e8ee;--card:#f6f8fa}
@media (prefers-color-scheme:dark){:root{--bg:#10161c;--fg:#e8edf2;--muted:#9aa7b4;--accent:#3ddc97;--line:#26303a;--card:#171f27}}
*{box-sizing:border-box}
body{margin:0;background:var(--bg);color:var(--fg);font:16px/1.6 system-ui,-apple-system,"Segoe UI",Roboto,sans-serif}
main{max-width:760px;margin:0 auto;padding:32px 18px 64px}
h1{font-size:1.9rem;margin:0 0 4px}
h2{font-size:1.2rem;margin:28px 0 8px;color:var(--accent)}
p,li{color:var(--fg)}
.muted{color:var(--muted);font-size:.92rem}
a{color:var(--accent)}
ul{padding-left:20px}
.card{background:var(--card);border:1px solid var(--line);border-radius:12px;padding:16px 18px;margin:18px 0}
nav a{margin-right:14px}
hr{border:0;border-top:1px solid var(--line);margin:40px 0}