:root{--bg:#fafafa;--fg:#1c1c1e;--muted:#6e6e73;--card:#fff;--line:#e5e5ea;--accent:#0a66d8}
@media (prefers-color-scheme:dark){:root:not([data-theme="light"]){--bg:#000;--fg:#f2f2f7;--muted:#98989d;--card:#1c1c1e;--line:#38383a;--accent:#4c9bff}}
*{box-sizing:border-box}
body{margin:0;background:var(--bg);color:var(--fg);font:16px/1.7 -apple-system,BlinkMacSystemFont,"PingFang TC","Noto Sans TC",sans-serif}
main{max-width:720px;margin:0 auto;padding:40px 16px 64px}
h1{font-size:28px;margin:0 0 4px}h2{font-size:20px;margin:32px 0 8px}
.muted{color:var(--muted);font-size:14px}
.card{background:var(--card);border:1px solid var(--line);border-radius:14px;padding:16px 20px;margin:16px 0}
a{color:var(--accent)}ul{padding-left:22px}
nav{margin-bottom:24px;font-size:14px}nav a{margin-right:16px}