:root{color-scheme:light dark;font-family:system-ui,-apple-system,BlinkMacSystemFont,Segoe UI,sans-serif;line-height:1.5}body{margin:0;padding:0;min-height:100vh;background:#f4f4f5;color:#111827}main{max-width:720px;margin:0 auto;padding:3rem 1.5rem}button{cursor:pointer}button,input{font:inherit}