:root{--bg:#f7f7f5;--fg:#1d1d1f;--muted:#5f6368;--line:#e2e2df;--card:#fff;--link:#1a56db}
@media (prefers-color-scheme:dark){:root{--bg:#141415;--fg:#ececec;--muted:#a0a0a5;--line:#2c2c2f;--card:#1c1c1e;--link:#8ab4f8}}
*{box-sizing:border-box}
body{margin:0;background:var(--bg);color:var(--fg);font:16px/1.75 -apple-system,BlinkMacSystemFont,"Segoe UI","PingFang TC","Noto Sans TC","Microsoft JhengHei",sans-serif}
main{max-width:680px;margin:0 auto;padding:56px 16px 72px}
.card{background:var(--card);border:1px solid var(--line);border-radius:12px;padding:32px 28px}
h1{font-size:1.6rem;line-height:1.35;margin:0 0 8px}
h2{font-size:1.1rem;margin:28px 0 6px}
p,li{margin:0 0 10px}
.muted{color:var(--muted);font-size:.92rem}
a{color:var(--link)}
footer{margin-top:24px;text-align:center}
hr{border:0;border-top:1px solid var(--line);margin:28px 0}