:root{--bg:#F4F6F3;--card:#fff;--ink:#14211C;--muted:#5B6B64;--brand:#123B2E;--line:#E1E7E2}
@media (prefers-color-scheme:dark){:root{--bg:#0E1512;--card:#16201C;--ink:#E8EEEA;--muted:#9DB0A7;--brand:#7FD1AE;--line:#25332D}}
*{box-sizing:border-box}body{margin:0;background:var(--bg);color:var(--ink);font:16px/1.65 -apple-system,BlinkMacSystemFont,"Segoe UI",Roboto,"PingFang SC","Noto Sans SC",sans-serif}
header{max-width:760px;margin:0 auto;padding:20px 16px;display:flex;gap:16px;align-items:center;flex-wrap:wrap}
header .brand{font-weight:700;font-size:18px;color:var(--ink);text-decoration:none;margin-right:auto}
header a{color:var(--muted);text-decoration:none;font-size:15px}header a:hover,header a.on{color:var(--brand)}
main{max-width:760px;margin:0 auto 48px;padding:0 16px}
.card{background:var(--card);border:1px solid var(--line);border-radius:16px;padding:28px 24px}
h1{font-size:30px;line-height:1.2;margin:0 0 6px}h2{font-size:19px;margin:28px 0 6px}p,li{color:var(--ink)}.muted{color:var(--muted);font-size:14px}
a{color:var(--brand)}ul{padding-left:20px}footer{max-width:760px;margin:0 auto 40px;padding:0 16px;color:var(--muted);font-size:13px}