*{box-sizing:border-box}body{font-family:system-ui,sans-serif;margin:0;line-height:1.5;color:#1a1a1a;background:#f8f9fa}
header,footer{background:#0f172a;color:#f8fafc;padding:1rem 1.25rem}main{max-width:40rem;margin:0 auto;padding:1.5rem 1.25rem}
h1{font-size:1.25rem;margin:0}a{color:#0369a1}