:root{--bg:#f7f7f8;--fg:#1d1d1f;--muted:#5f6368;--accent:#c4302b;--card:#fff}
@media (prefers-color-scheme:dark){:root{--bg:#121214;--fg:#ececec;--muted:#a0a0a6;--card:#1c1c1f}}
*{box-sizing:border-box}body{margin:0;background:var(--bg);color:var(--fg);font:16px/1.6 system-ui,-apple-system,Segoe UI,Roboto,sans-serif}
main{max-width:760px;margin:0 auto;padding:40px 16px}header a,footer a{color:var(--accent)}
h1{font-size:2rem;margin:.2em 0}h2{margin-top:1.8em;font-size:1.25rem}.card{background:var(--card);border-radius:12px;padding:24px;margin:20px 0}
.muted{color:var(--muted)}footer{margin-top:40px;font-size:.9rem;color:var(--muted)}nav a{margin-right:16px}