@media (max-width: 900px) {
    .wiki-container { flex-direction: column; }
    .sidebar {
        position: fixed;
        transform: translateX(-100%);
        transition: transform 0.3s ease-in-out;
        z-index: 1000;
        border-right: none;
    }
    .sidebar.is-open {
        transform: translateX(0);
    }
    .main-content { margin-left: 0; width: 100%; padding: 20px; }
    .mobile-menu-toggle {
        display: block;
        position: fixed;
        top: 15px;
        right: 15px;
        z-index: 1001;
        background-color: var(--bg-widget);
        color: var(--text-primary);
        border: 1px solid var(--border-color);
        width: 40px;
        height: 40px;
        border-radius: 50%;
        font-size: 1.2em;
        cursor: pointer;
    }
    .article-wrapper {
        background-color: transparent !important;
        border: none !important;
        padding: 0 !important;
        border-radius: 0 !important;
    }
}