/* Hiệu ứng bấm icon ứng dụng */
.app-icon {
    transition: transform 0.1s ease, filter 0.2s ease;
}
.app-icon:active {
    transform: scale(0.85);
    filter: brightness(0.8);
}

/* Kéo thả Sortable */
.sortable-ghost {
    opacity: 0.4;
}
.sortable-drag {
    transform: scale(1.1);
    filter: drop-shadow(0 10px 15px rgba(0,0,0,0.3));
}