:root{--bg:#fbfaf7;--fg:#1d2320;--muted:#66706a;--accent:#2f7d55;--line:#e3e0d8}
@media (prefers-color-scheme:dark){:root{--bg:#141815;--fg:#e8ece9;--muted:#9aa49e;--accent:#6cc394;--line:#2b322d}}
*{box-sizing:border-box}
body{margin:0;background:var(--bg);color:var(--fg);font:16px/1.6 -apple-system,BlinkMacSystemFont,"Segoe UI","PingFang SC","Hiragino Sans",sans-serif}
main{max-width:720px;margin:0 auto;padding:32px 16px 64px}
h1{font-size:1.8rem;line-height:1.25;margin:.4em 0}
h2{font-size:1.15rem;margin:1.8em 0 .4em}
a{color:var(--accent)}
.muted,.nav{color:var(--muted);font-size:.9rem}
hr{border:0;border-top:1px solid var(--line);margin:48px 0}
li{margin:.4em 0}
.card{border:1px solid var(--line);border-radius:12px;padding:16px 18px;margin:16px 0}