:root{--bg:#f7f9fc;--fg:#14213a;--muted:#5a6680;--card:#fff;--line:#e3e8f0;--accent:#1f7a68}
@media (prefers-color-scheme:dark){:root{--bg:#0f1726;--fg:#e8edf6;--muted:#9aa7bf;--card:#16213a;--line:#24314d;--accent:#5fd3b5}}
*{box-sizing:border-box}body{margin:0;background:var(--bg);color:var(--fg);font:16px/1.65 -apple-system,BlinkMacSystemFont,"Segoe UI",Roboto,"PingFang SC","Microsoft YaHei",sans-serif}
main{max-width:760px;margin:0 auto;padding:32px 16px 64px}h1{font-size:28px;line-height:1.25;margin:0 0 4px}h2{font-size:19px;margin:28px 0 8px}
.meta{color:var(--muted);font-size:14px;margin-bottom:20px}nav{display:flex;gap:12px;flex-wrap:wrap;margin-bottom:24px;font-size:14px}
a{color:var(--accent)}section.lang{background:var(--card);border:1px solid var(--line);border-radius:14px;padding:8px 22px 20px;margin-bottom:28px}
ul{padding-left:20px}footer{color:var(--muted);font-size:13px;text-align:center}