:root{color-scheme:light dark;--fg:#17242b;--bg:#f6f7f8;--card:#fff;--muted:#52616b;--line:#dde3e6;--link:#1d5c66}
@media (prefers-color-scheme:dark){:root{--fg:#e6ecef;--bg:#11181b;--card:#182226;--muted:#9fb0b8;--line:#2a373c;--link:#7fc4cf}}
*{box-sizing:border-box}body{margin:0;background:var(--bg);color:var(--fg);font:17px/1.6 system-ui,-apple-system,"Segoe UI",sans-serif}
main{max-width:46rem;margin:0 auto;padding:3rem 1.25rem 4rem}article{background:var(--card);border:1px solid var(--line);border-radius:12px;padding:2rem}
h1{font-size:1.8rem;line-height:1.25;margin:0 0 .5rem}h2{font-size:1.15rem;margin:2rem 0 .5rem}p,li{margin:.4rem 0}a{color:var(--link)}
.muted{color:var(--muted)}footer{margin-top:1.5rem;font-size:.9rem;color:var(--muted)}nav a{margin-right:1rem}