*{box-sizing:border-box}body{margin:0;font-family:system-ui,sans-serif;line-height:1.5}.navbar{background:#f8f8f8;border-bottom:1px solid #ddd;gap:1rem;padding:.75rem 1.25rem;display:flex}.navbar a{color:#333;text-decoration:none}.navbar a:hover{text-decoration:underline}.navbar a.active{color:#0b5fff;font-weight:700}main{padding:1.25rem}