:root{font-family:Inter,system-ui,Avenir,Helvetica,Arial,sans-serif;line-height:1.5;font-weight:400;color-scheme:dark;background-color:#000}body{margin:0;padding:0;min-width:320px;min-height:100vh;overflow:hidden}h1{font-size:3.2em;line-height:1.1}button{cursor:pointer}