/* Responsive Design */
@media (max-width: 768px) {
    body {
        padding: 10px;
    }
    .header-title {
        font-size: 2rem;
    }
    .category-item {
        font-size: 0.7rem;
    }
    h1.title {
        font-size: 1.2em;
    }
    .side-note {
        display: none;
    }

    #table-of-contents {
        display: none;
    }
}