.color-group {
    margin-bottom: 20px;
    border: 1px solid #ddd;
    border-radius: 5px;
    overflow: hidden;
}

.color-group-header {
    background-color: #f5f5f5;
    padding: 10px 15px;
    cursor: pointer;
    display: flex;
    justify-content: space-between;
    align-items: center;
}

.color-group-header:hover {
    background-color: #e9e9e9;
}

.color-group-header::after {
    content: '\25BC';
    font-size: 0.8em;
    transition: transform 0.3s ease;
}

.color-group-header.collapsed::after {
    transform: rotate(-90deg);
}

.color-grid {
    display: grid;
    grid-template-columns: repeat(auto-fill, minmax(150px, 1fr));
    gap: 10px; /* Equal gap on all sides */
    padding: 0 10px; /* Horizontal padding when collapsed to maintain layout */
    height: 0;
    overflow: hidden;
    transition: height 0.3s ease, padding 0.3s ease; /* Smooth height and padding transitions */
}

.color-grid.expanded {
    height: auto;
    padding: 10px; /* Equal padding when expanded */
    margin-top: 10px; /* Add margin top to ensure space above the expanded group */
}

.color-square {
    width: 150px;
    height: 150px;
    position: relative;
    cursor: pointer;
    transition: transform 0.2s ease;
}

.color-square:hover {
    transform: scale(1.05);
}

.ncs-code {
    position: absolute;
    top: 5px;
    left: 5px;
    background-color: rgba(255, 255, 255, 0.7);
    padding: 2px 5px;
    font-size: 0.8em;
    border-radius: 3px;
}

@media (max-width: 768px) {
    .color-grid {
        grid-template-columns: repeat(auto-fill, minmax(150px, 1fr));
    }

    .color-square {
        width: 150px;
        height: 150px;
    }
}