:root{color:#18343d;background:#f5f8f9;font-family:system-ui,sans-serif;line-height:1.8}body{margin:0}main{max-width:48rem;margin:10vh auto;padding:clamp(1.5rem,5vw,3rem)}h1{font-size:clamp(1.5rem,4vw,2rem);line-height:1.5}