/* ===================================
   Popular Products Section
   =================================== */

.popular-products-section {
    padding: var(--spacing-xl) 0;
    position: relative;
}

.popular-products-section::before {
    content: '';
    position: absolute;
    top: 0;
    left: 0;
    right: 0;
    bottom: 0;
    background: url('../../assets/images/products-bg.jpg') center/cover no-repeat;
    -webkit-mask-image:
        linear-gradient(to bottom, transparent 0%, black 15%, black 85%, transparent 100%),
        linear-gradient(to right, transparent 0%, black 15%, black 85%, transparent 100%);
    -webkit-mask-composite: source-in;
    mask-image:
        linear-gradient(to bottom, transparent 0%, black 15%, black 85%, transparent 100%),
        linear-gradient(to right, transparent 0%, black 15%, black 85%, transparent 100%);
    mask-composite: intersect;
    z-index: 0;
    pointer-events: none;
}

.popular-products-section .section-title {
    text-align: center;
    margin-bottom: var(--spacing-lg);
    position: relative;
    z-index: 1;
}

.popular-products-section .section-title::after {
    display: none;
}

/* Shelf Container */
.products-shelf {
    position: relative;
    display: flex;
    align-items: center;
    justify-content: center;
    gap: var(--spacing-md);
    max-width: 1200px;
    margin: 0 auto;
    z-index: 1;
}

.shelf-container {
    flex: 1;
    overflow: hidden;
    position: relative;
    padding: var(--spacing-md);
    padding-right: calc(var(--spacing-md) - 1px);
    background: var(--bg-white);
    border-radius: var(--radius-lg);
    width: 100%;
    box-shadow: 0 10px 40px rgba(0, 48, 135, 0.08);
    border: 1px solid rgba(0, 48, 135, 0.08);
}

/* Shelf Track */
.shelf-track {
    display: flex;
    gap: var(--spacing-md);
    transition: transform 0.5s cubic-bezier(0.4, 0, 0.2, 1);
}

/* Card sizes: N cards + (N-1) gaps = 100% of shelf-overflow */
.shelf-track article.product-card {
    flex: 0 0 calc((100% - (3 * var(--spacing-md))) / 4);
    border-radius: var(--radius-lg);
    overflow: hidden;
    background: var(--bg-white);
}

@media (max-width: 968px) {
    .shelf-track article.product-card {
        flex: 0 0 calc((100% - (2 * var(--spacing-md))) / 3);
    }
}

@media (max-width: 768px) {
    .shelf-track article.product-card {
        flex: 0 0 calc((100% - var(--spacing-md)) / 2);
    }
}

.shelf-track .product-link {
    display: block;
    color: inherit;
    text-decoration: none;
    cursor: pointer;
    -webkit-tap-highlight-color: transparent;
    touch-action: manipulation;
}

.shelf-track .product-image {
    position: relative;
    width: 100%;
    aspect-ratio: 1;
    overflow: hidden;
    display: flex;
    align-items: center;
    justify-content: center;
    background: linear-gradient(
        90deg,
        #e0e0e0 0%,
        #f0f0f0 50%,
        #e0e0e0 100%
    );
    background-size: 200% 100%;
    animation: shimmer 2s infinite linear;
}

.shelf-track .product-image.image-loaded {
    background: transparent;
    animation: none;
}

.shelf-track .product-image img {
    width: 100%;
    height: 100%;
    object-fit: contain;
    backface-visibility: hidden;
    -webkit-backface-visibility: hidden;
    -webkit-transform: scale(0.9);
    transform: scale(0.9);
    -webkit-transition: -webkit-transform 0.6s cubic-bezier(0.25, 0.1, 0.25, 1), opacity 0.4s ease-in;
    transition: transform 0.6s cubic-bezier(0.25, 0.1, 0.25, 1), opacity 0.4s ease-in;
}

.shelf-track article.product-card:hover .product-image img,
.shelf-track article.product-card:focus-within .product-image img {
    -webkit-transform: scale(0.95);
    transform: scale(0.95);
}

.shelf-track .product-info {
    padding: var(--spacing-sm) var(--spacing-md);
    padding-bottom: var(--spacing-md);
    text-align: left;
}

.shelf-track .product-title {
    font-family: var(--font-heading);
    font-size: 0.8125rem;
    font-weight: 600;
    margin: 0;
    color: var(--text-dark);
    line-height: 1.4;
    display: -webkit-box;
    -webkit-line-clamp: 2;
    -webkit-box-orient: vertical;
    overflow: hidden;
    min-height: calc(1.4em * 2);
}

/* Navigation Arrows */
.shelf-nav {
    width: 56px;
    height: 56px;
    border-radius: 50%;
    background: linear-gradient(135deg, var(--primary-color) 0%, var(--primary-light) 100%);
    border: none;
    color: white;
    display: flex;
    align-items: center;
    justify-content: center;
    cursor: pointer;
    transition: all var(--transition-normal);
    flex-shrink: 0;
    z-index: 10;
    box-shadow: 0 4px 12px rgba(0, 48, 135, 0.25);
}

.shelf-nav svg {
    width: 28px;
    height: 28px;
}

.shelf-nav:hover:not(:disabled) {
    background: linear-gradient(135deg, var(--primary-light) 0%, var(--secondary-color) 100%);
    transform: scale(1.1);
    box-shadow: 0 6px 20px rgba(0, 48, 135, 0.35);
}

.shelf-nav:active:not(:disabled) {
    transform: scale(0.98);
}

.shelf-nav:disabled {
    opacity: 0.4;
    cursor: not-allowed;
    background: linear-gradient(135deg, #9ca3af 0%, #d1d5db 100%);
    box-shadow: none;
}

/* Shimmer Loading State */
@keyframes shimmer {
    0% { background-position: -200% 0; }
    100% { background-position: 200% 0; }
}

.shelf-track .shimmer-card {
    pointer-events: none;
}

.shelf-track .shimmer-card .product-image.shimmer {
    aspect-ratio: 1;
    background: linear-gradient(90deg, #e0e0e0 0%, #f0f0f0 50%, #e0e0e0 100%);
    background-size: 200% 100%;
    animation: shimmer 2s infinite linear;
}

.shelf-track .shimmer-title {
    height: 1rem;
    width: 70%;
    margin: 0 auto var(--spacing-xs);
    border-radius: var(--radius-sm);
    background: linear-gradient(90deg, #e0e0e0 0%, #f0f0f0 50%, #e0e0e0 100%);
    background-size: 200% 100%;
    animation: shimmer 2s infinite linear;
}

.shelf-track .shimmer-category {
    height: 0.75rem;
    width: 50%;
    margin: 0 auto;
    border-radius: var(--radius-sm);
    background: linear-gradient(90deg, #e0e0e0 0%, #f0f0f0 50%, #e0e0e0 100%);
    background-size: 200% 100%;
    animation: shimmer 2s infinite linear;
}

/* Responsive */
@media (max-width: 768px) {
    .popular-products-section .container {
        padding: 0;
    }

    .popular-products-section .section-title {
        padding: 0 var(--spacing-sm);
    }

    .products-shelf {
        gap: var(--spacing-xs);
        padding: 0 var(--spacing-sm);
    }

    .shelf-container {
        padding: var(--spacing-sm) var(--spacing-xs);
    }

    .shelf-nav {
        width: 40px;
        height: 40px;
        flex-shrink: 0;
    }

    .shelf-track .product-info {
        padding: var(--spacing-sm) var(--spacing-xs);
    }
}