*{box-sizing:border-box;margin:0;padding:0}body{font-family:system-ui,sans-serif;background:#fff;color:#333}header{background:#f8f9fa;padding:1rem;border-bottom:1px solid #ddd}nav{max-width:960px;margin:0 auto;display:flex;justify-content:space-between}.logo{font-size:1.5rem;text-decoration:none;color:#222}.button{background:#007bff;color:#fff;padding:.5em 1em;border-radius:4px;text-decoration:none}.button:hover{background:#0056b3}main{max-width:960px;margin:2rem auto;padding:0 1rem}footer{text-align:center;padding:1rem;background:#f1f1f1;font-size:.9rem}