@media (max-width: 768px) {
    .sidebar {
        position: fixed;
        top: 0;
        left: 0;
        height: 100%;
        transform: translateX(-100%);
        z-index: 200;
        box-shadow: 2px 0 20px rgba(0,0,0,0.1);
        transition: transform 0.3s cubic-bezier(0.2, 0.9, 0.4, 1.1);
    }
    .sidebar.open {
        transform: translateX(0);
    }
    .menu-toggle {
        display: flex;
    }
    .cards-grid {
        grid-template-columns: 1fr;
        gap: 16px;
    }
    .top-bar {
        padding: 12px 16px;
    }
    .scrollable-content {
        padding: 20px 16px;
    }
    .group-title h2 {
        font-size: 1.1rem;
    }
    .footer {
        padding: 1rem 0.8rem;
        margin-top: 2rem;
    }
    .modal-content {
        max-width: 95vw;
        max-height: 95vh;
    }
    .modal-close {
        width: 32px;
        height: 32px;
        font-size: 20px;
        top: 8px;
        left: 8px;
    }
}