:root {
        --primary-color: #4e73df;
        --secondary-color: #6f42c1;
        --success-color: #1cc88a;
        --light-bg: #f8f9fc;
        --border-color: #e3e6f0;
    }
    
    body {
        background-color: #f5f7fb;
        font-family: 'Nunito', sans-serif;
    }
    
    .card {
        border: none;
        border-radius: 10px;
        box-shadow: 0 0.15rem 1.75rem 0 rgba(58, 59, 69, 0.15);
        margin-bottom: 1.5rem;
    }
    
    .card-header {
        background-color: white;
        border-bottom: 1px solid var(--border-color);
        font-weight: 700;
        padding: 1rem 1.35rem;
    }
    
    .card-body {
        padding: 1.5rem;
    }
    
    .btn-primary {
        background-color: var(--primary-color);
        border-color: var(--primary-color);
    }
    
    .btn-primary:hover {
        background-color: #3a5fc8;
        border-color: #3a5fc8;
    }
    
    .drop-zone {
        border: 2px dashed #d1d3e2;
        border-radius: 8px;
        padding: 2rem;
        text-align: center;
        cursor: pointer;
        transition: all 0.3s;
        background-color: white;
        height: 180px;
        display: flex;
        flex-direction: column;
        justify-content: center;
        align-items: center;
        position: relative;
        overflow: hidden;
    }
    
    .drop-zone:hover {
        border-color: var(--primary-color);
        background-color: var(--light-bg);
    }
    
    .drop-zone.dragover {
        background-color: rgba(78, 115, 223, 0.1);
        border-color: var(--primary-color);
    }
    
    .drop-zone.has-image {
        border: none;
        padding: 0;
    }
    
    .drop-zone-preview {
        width: 100%;
        height: 100%;
        object-fit: cover;
        border-radius: 6px;
    }
    
    .drop-zone-content {
        color: #858796;
        transition: opacity 0.3s;
    }
    
    .drop-zone.has-image .drop-zone-content {
        opacity: 0;
    }
    
    .drop-zone-actions {
        position: absolute;
        bottom: 10px;
        right: 10px;
        opacity: 0;
        transition: opacity 0.3s;
    }
    
    .drop-zone:hover .drop-zone-actions {
        opacity: 1;
    }
    
    .drop-zone-icon {
        font-size: 2.5rem;
        color: #d1d3e2;
        margin-bottom: 1rem;
    }
    
    .drop-zone.dragover .drop-zone-icon {
        color: var(--primary-color);
    }
    
    .ql-container {
        height: 200px;
        font-size: 1rem;
        background: #fff;
        margin-bottom: 20px;
        border-radius: 0 0 5px 5px;
    }
    
    .ql-toolbar {
        border-radius: 5px 5px 0 0;
    }
    
    .product-card {
        background: white;
        border-radius: 8px;
        padding: 15px;
        margin-bottom: 15px;
        border: 1px solid var(--border-color);
        transition: all 0.3s ease;
        cursor: pointer;
        position: relative;
    }
    
    .product-card:hover {
        transform: translateY(-3px);
        box-shadow: 0 0.5rem 1.5rem rgba(0, 0, 0, 0.1);
        border-color: var(--primary-color);
    }
    
    .product-card.selected {
        background: #e8f5e9;
        border-color: #28a745;
    }
    
    .product-card .product-image {
        height: 120px;
        background-size: cover;
        background-position: center;
        border-radius: 5px;
        margin-bottom: 10px;
    }
    
    .product-card .product-title {
        font-weight: 600;
        margin-bottom: 5px;
        white-space: nowrap;
        overflow: hidden;
        text-overflow: ellipsis;
    }
    
    .product-card .product-price {
        font-weight: 700;
        color: #2e7d32;
    }
    
    .product-card .checkmark {
        position: absolute;
        top: 10px;
        right: 10px;
        color: #fff;
        background: #4caf50;
        width: 24px;
        height: 24px;
        border-radius: 50%;
        display: flex;
        align-items: center;
        justify-content: center;
        opacity: 0;
        transition: opacity 0.3s;
    }
    
    .product-card.selected .checkmark {
        opacity: 1;
    }
    
    .bundle-summary {
        background: var(--light-bg);
        padding: 15px;
        border-radius: 8px;
        margin-bottom: 20px;
    }
    
    .bundle-summary h5 {
        margin-bottom: 15px;
        color: #333;
        font-weight: 600;
    }
    
    .bundle-summary-item {
        display: flex;
        align-items: center;
        padding: 8px 0;
        border-bottom: 1px solid var(--border-color);
    }
    
    .bundle-summary-item:last-child {
        border-bottom: none;
    }
    
    .bundle-summary-item img {
        width: 50px;
        height: 50px;
        object-fit: cover;
        border-radius: 4px;
        margin-right: 10px;
    }
    
    .bundle-summary-item .item-details {
        flex-grow: 1;
    }
    
    .bundle-summary-item .item-price {
        font-weight: 600;
    }
    
    .total-price {
        font-size: 1.2rem;
        font-weight: 700;
        color: #d32f2f;
        margin-top: 10px;
        padding-top: 10px;
        border-top: 2px solid var(--border-color);
    }
    
    .price-suggestion {
        font-size: 0.9rem;
        color: #666;
        margin-top: 5px;
    }
    
    .empty-state {
        text-align: center;
        padding: 30px;
        color: #666;
    }
    
    .empty-state i {
        font-size: 3rem;
        margin-bottom: 15px;
        color: #bdbdbd;
    }
    
    .progress {
        height: 8px;
        margin-top: 10px;
        display: none;
    }
    
    .upload-status {
        font-size: 0.85rem;
        margin-top: 5px;
        display: none;
    }
    
    .section-title {
        font-weight: 700;
        color: #4e73df;
        margin-bottom: 1.5rem;
        padding-bottom: 0.5rem;
        border-bottom: 2px solid #4e73df;
    }
    
    .form-label {
        font-weight: 600;
        margin-bottom: 0.5rem;
        color: #5a5c69;
    }
    
    .custom-checkbox .form-check-input:checked {
        background-color: var(--primary-color);
        border-color: var(--primary-color);
    }