:root{--bg:#fff;--fg:#1f1f1f;--muted:#6b6b6b;--line:#e8e8e6;--accent:#2563eb}
@media (prefers-color-scheme:dark){:root{--bg:#191919;--fg:#ececec;--muted:#9b9b9b;--line:#2f2f2f;--accent:#60a5fa}}
*{box-sizing:border-box}
body{margin:0;background:var(--bg);color:var(--fg);font:16px/1.65 -apple-system,BlinkMacSystemFont,"Inter","Segoe UI",sans-serif}
main{max-width:680px;margin:0 auto;padding:64px 16px}
h1{font-size:2rem;margin:0 0 8px;letter-spacing:-.02em}
h2{font-size:1.1rem;margin:32px 0 8px}
p,li{color:var(--fg)}
.sub{color:var(--muted);margin:0 0 32px}
a{color:var(--accent);text-decoration:none}a:hover{text-decoration:underline}
footer{margin-top:48px;padding-top:16px;border-top:1px solid var(--line);color:var(--muted);font-size:.9rem}