:root{--bg:#fafaf8;--fg:#1d1d1b;--muted:#5f5f5a;--line:#e3e3de;--accent:#2f5d8a}
@media (prefers-color-scheme:dark){:root{--bg:#141413;--fg:#ecebe6;--muted:#a3a29b;--line:#2c2c2a;--accent:#8fb4dc}}
*{box-sizing:border-box}body{margin:0;background:var(--bg);color:var(--fg);font:16px/1.6 system-ui,-apple-system,"Segoe UI",sans-serif}
main{max-width:680px;margin:0 auto;padding:56px 16px}h1{font-size:1.9rem;margin:0 0 .4rem}h2{font-size:1.1rem;margin:2rem 0 .4rem}
p,li{color:var(--muted)}a{color:var(--accent)}nav{display:flex;gap:16px;padding:16px;max-width:680px;margin:0 auto;border-bottom:1px solid var(--line)}
footer{max-width:680px;margin:0 auto;padding:24px 16px;border-top:1px solid var(--line);font-size:.85rem;color:var(--muted)}