nav { display: flex; gap: 0.5rem; margin-bottom: 1.5rem; }
nav a { text-decoration: none; color: #555; padding: 0.3rem 0.7rem; border-radius: 4px; }
nav a.active { background: #e0e0e0; color: #000; font-weight: bold; }
nav a:hover:not(.active) { background: #f0f0f0; }