body{font-family:system-ui,-apple-system,Segoe UI,Roboto,Helvetica Neue,Arial;margin:0;padding:0;line-height:1.6}.nav ul{display:flex;list-style:none;gap:1rem;padding:1rem;margin:0;background:#f5f5f5}.nav a{text-decoration:none}main{padding:1.5rem}footer{padding:1rem;text-align:center;border-top:1px solid #eee}