body{font:16px/1.6 -apple-system,system-ui,sans-serif;max-width:720px;margin:0 auto;padding:24px 16px;color:#111;background:#fff}
@media(prefers-color-scheme:dark){body{color:#eee;background:#000}a{color:#6cf}}
h1{font-size:1.8rem}h2{margin-top:2rem}