:root{color-scheme:light;font-family:system-ui,-apple-system,Segoe UI,sans-serif}*{box-sizing:border-box}body{margin:0;background:#fff;color:#111;line-height:1.5}main{max-width:720px;margin:0 auto;padding:2rem 1rem 4rem}h1{font-size:2rem;line-height:1.2}a{color:inherit}