:root{--bg:#fff;--fg:#1f2233;--muted:#5b6078;--brand:#4F46E5;--line:#e6e7ef}
@media (prefers-color-scheme:dark){:root{--bg:#0f1020;--fg:#eceef8;--muted:#a3a8c3;--line:#26284a}}
body{margin:0;background:var(--bg);color:var(--fg);font:16px/1.6 -apple-system,BlinkMacSystemFont,"Segoe UI",Roboto,sans-serif}
main{max-width:760px;margin:0 auto;padding:32px 16px 64px}
h1{font-size:28px;margin:0 0 4px}h2{font-size:19px;margin:28px 0 8px}
p,li{color:var(--fg)}.muted{color:var(--muted);font-size:14px}a{color:var(--brand)}
nav{border-bottom:1px solid var(--line);padding:12px 16px;text-align:center}nav a{margin:0 10px;text-decoration:none;font-weight:600}