:root{font-family:system-ui,-apple-system,Segoe UI,Roboto,sans-serif;color-scheme:light dark}body{margin:0;min-height:100vh;display:grid;place-items:center;background:#0f172a;color:#e2e8f0}.container{text-align:center;padding:2rem}h1{font-size:clamp(2rem,5vw,3.5rem);margin:0 0 .5rem}p{opacity:.7;margin:0}