body{font-family:"Helvetica Neue", sans-serif;max-width:800px;margin:auto;padding:1rem;color:#333;background:#fafafa}header,footer{text-align:center;margin-bottom:2rem}nav a{margin:0 1rem;text-decoration:none;color:#007acc}h1,h2{color:#222}a:hover{text-decoration:underline}