.category-nav {
    margin: 2rem 0;
    padding: 1rem;
    background: #f5f5f5;
    border-radius: 5px;
    text-align: center;
}

.category-nav a {
    color: #333;
    text-decoration: none;
    padding: 0.5rem 1rem;
    margin: 0 0.5rem;
    border-radius: 3px;
    transition: all 0.3s ease;
}

.category-nav a:hover {
    background: #333;
    color: white;
}

h2[id] {
    padding-top: 2rem;
    margin-top: 2rem;
    border-top: 2px solid #eee;
}