:root{color-scheme:light dark;font-family:system-ui,sans-serif}body{margin:0;min-height:100svh;display:grid;place-items:center;background:#f4f6f8;color:#172b3a}main{box-sizing:border-box;max-width:42rem;padding:2rem;margin:1rem}h1{font-size:clamp(1.6rem,5vw,2.2rem)}p{line-height:1.65;font-size:1.1rem}@media(prefers-color-scheme:dark){body{background:#101820;color:#eef4f8}}