:root{color-scheme:light dark;font-family:system-ui,-apple-system,"Segoe UI",Roboto,sans-serif}body{margin:0;min-height:100vh;display:grid;place-items:center;background:Canvas;color:CanvasText}main{text-align:center;padding:16px}h1{font-size:clamp(2rem,8vw,4rem);margin:0 0 0.5rem}