:root{color-scheme:light dark}
body{font:17px/1.6 -apple-system,BlinkMacSystemFont,"Segoe UI",Roboto,sans-serif;max-width:680px;margin:0 auto;padding:32px 20px;color:#1d1d1f;background:#fff}
@media(prefers-color-scheme:dark){body{color:#f5f5f7;background:#000}a{color:#4da3ff}}
h1{font-size:28px}h2{font-size:20px;margin-top:32px}
footer{margin-top:48px;font-size:14px;opacity:.7}