/**
 * Collection (product list) page – reference-style layout
 * Sort | Filter bar, filter chips, bottom sheet, professional 2-col cards
 * Colors: Queen Orange palette (unchanged)
 */

/* Page header */
.collection-page-header {
    padding: var(--space-4) 0 var(--space-3);
    background: var(--white);
    border-bottom: 1px solid var(--gray-100);
}

.collection-page-title {
    font-family: var(--font-display);
    font-size: clamp(22px, 5vw, 28px);
    font-weight: 700;
    color: var(--black);
    margin: 0 0 var(--space-1);
}

.collection-page-description {
    font-size: 14px;
    color: var(--gray-500);
    margin: 0;
}

.collection-container {
    padding-top: var(--space-3);
    padding-bottom: var(--space-8);
}

/* Sort | Filter toolbar */
.collection-toolbar {
    display: flex;
    align-items: center;
    justify-content: space-between;
    gap: var(--space-4);
    padding: var(--space-3) 0;
    background: var(--white);
    border-bottom: 1px solid var(--gray-100);
    margin-bottom: var(--space-3);
}

.toolbar-sort {
    display: flex;
    align-items: center;
    gap: var(--space-2);
}

.toolbar-label {
    font-size: 14px;
    font-weight: 600;
    color: var(--gray-700);
    margin: 0;
}

.toolbar-sort-select {
    padding: var(--space-2) var(--space-3);
    font-size: 14px;
    border: 1px solid var(--gray-200);
    border-radius: var(--radius-md);
    background: var(--white);
    color: var(--black);
    cursor: pointer;
    min-width: 140px;
}

.toolbar-divider {
    width: 1px;
    height: 24px;
    background: var(--gray-200);
    flex-shrink: 0;
}

.toolbar-filter-btn {
    display: inline-flex;
    align-items: center;
    gap: var(--space-2);
    padding: var(--space-2) var(--space-4);
    font-size: 14px;
    font-weight: 600;
    color: var(--black);
    background: var(--white);
    border: 1px solid var(--gray-200);
    border-radius: var(--radius-md);
    cursor: pointer;
    position: relative;
}

.toolbar-filter-btn:hover {
    border-color: var(--primary);
    color: var(--primary);
}

.toolbar-filter-icon {
    width: 18px;
    height: 18px;
}

.toolbar-filter-dot {
    position: absolute;
    top: 6px;
    right: 8px;
    width: 8px;
    height: 8px;
    background: var(--primary);
    border-radius: 50%;
}

/* Filter chips */
.filter-chips-wrap {
    margin-bottom: var(--space-4);
    -webkit-overflow-scrolling: touch;
}

.filter-chips {
    display: flex;
    gap: var(--space-2);
    overflow-x: auto;
    scrollbar-width: none;
    padding-bottom: var(--space-2);
}

.filter-chips::-webkit-scrollbar {
    display: none;
}

.filter-chip {
    flex-shrink: 0;
    display: inline-flex;
    align-items: center;
    padding: var(--space-2) var(--space-4);
    font-size: 13px;
    font-weight: 500;
    color: var(--gray-700);
    background: var(--gray-50);
    border: 1px solid var(--gray-200);
    border-radius: var(--radius-full);
    text-decoration: none;
    transition: all var(--transition-fast);
}

.filter-chip:hover {
    border-color: var(--primary-light);
    color: var(--primary-dark);
}

.filter-chip.active {
    background: var(--primary-light);
    border-color: var(--primary);
    color: var(--primary-dark);
}

/* Product count */
.collection-product-count {
    font-size: 13px;
    color: var(--gray-600);
    margin: 0 0 var(--space-4);
}

/* 2-col grid – professional cards */
.collection-product-grid {
    display: grid;
    grid-template-columns: repeat(2, 1fr);
    gap: var(--space-4);
}

@media (min-width: 640px) {
    .collection-product-grid {
        gap: var(--space-5);
    }
}

@media (min-width: 1024px) {
    .collection-product-grid {
        grid-template-columns: repeat(4, 1fr);
        gap: var(--space-6);
    }
}

/* Collection product card – crisp, professional */
.collection-product-card {
    position: relative;
    background: var(--white);
    border-radius: var(--radius-md);
    border: 1px solid var(--gray-200);
    overflow: hidden;
    box-shadow: var(--shadow-xs);
    transition: box-shadow var(--transition-base), border-color var(--transition-base);
    display: flex;
    flex-direction: column;
}

.collection-product-card:hover {
    border-color: var(--gray-300);
    box-shadow: var(--shadow-md);
}

.collection-card-link {
    text-decoration: none;
    color: inherit;
    display: flex;
    flex-direction: column;
    flex: 1;
}

.collection-card-image {
    position: relative;
    width: 100%;
    padding-top: 125%;
    background: var(--gray-50);
    overflow: hidden;
}

.collection-card-image img {
    position: absolute;
    top: 0;
    left: 0;
    width: 100%;
    height: 100%;
    object-fit: cover;
    transition: transform var(--transition-slow);
}

.collection-product-card:hover .collection-card-image img {
    transform: scale(1.04);
}

/* Badges on image */
.collection-card-badge {
    position: absolute;
    top: var(--space-2);
    left: var(--space-2);
    padding: 4px 8px;
    font-size: 10px;
    font-weight: 700;
    text-transform: uppercase;
    letter-spacing: 0.3px;
    border-radius: var(--radius-sm);
    z-index: 2;
}

.collection-card-badge-bestseller {
    background: #16a34a;
    color: var(--white);
}

.collection-card-badge-discount {
    background: var(--primary-dark);
    color: var(--white);
}

/* Wishlist on image */
.collection-product-card .product-card-wishlist {
    position: absolute;
    top: var(--space-2);
    right: var(--space-2);
    z-index: 2;
    width: 36px;
    height: 36px;
    padding: 0;
    border: none;
    background: var(--white);
    border-radius: var(--radius-md);
    cursor: pointer;
    display: flex;
    align-items: center;
    justify-content: center;
    box-shadow: var(--shadow-sm);
}

.collection-product-card .product-card-wishlist .wishlist-heart {
    width: 18px;
    height: 18px;
}

/* Card info */
.collection-card-info {
    padding: var(--space-3);
    flex: 1;
    display: flex;
    flex-direction: column;
}

.collection-card-category {
    font-size: 11px;
    color: var(--gray-500);
    margin: 0 0 var(--space-1);
    text-transform: uppercase;
    letter-spacing: 0.02em;
}

.collection-card-name {
    font-size: 13px;
    font-weight: 600;
    color: var(--black);
    line-height: 1.35;
    margin: 0 0 var(--space-2);
    display: -webkit-box;
    -webkit-line-clamp: 2;
    line-clamp: 2;
    -webkit-box-orient: vertical;
    overflow: hidden;
}

.collection-card-price-block {
    margin-top: auto;
}

.collection-card-discount-pct {
    font-size: 12px;
    font-weight: 600;
    color: #16a34a;
    display: inline-block;
    margin-bottom: 2px;
}

.collection-card-prices {
    display: flex;
    align-items: baseline;
    gap: var(--space-2);
    flex-wrap: wrap;
}

.collection-card-prices .current-price {
    font-size: 16px;
    font-weight: 700;
    color: var(--black);
}

.collection-card-prices .original-price {
    font-size: 12px;
    color: var(--gray-400);
    text-decoration: line-through;
}

/* Empty state */
.collection-empty {
    text-align: center;
    padding: var(--space-10) var(--space-4);
}

.collection-empty-icon {
    font-size: 48px;
    margin-bottom: var(--space-4);
    opacity: 0.5;
}

.collection-empty h2 {
    font-size: 20px;
    margin-bottom: var(--space-2);
    color: var(--black);
}

.collection-empty p {
    color: var(--gray-600);
    margin-bottom: var(--space-5);
}

/* Pagination */
.collection-pagination {
    display: flex;
    align-items: center;
    justify-content: center;
    gap: var(--space-4);
    margin-top: var(--space-8);
    flex-wrap: wrap;
}

.pagination-link {
    padding: var(--space-2) var(--space-4);
    font-weight: 600;
    color: var(--primary-dark);
    text-decoration: none;
    border-radius: var(--radius-md);
    border: 1px solid var(--gray-200);
}

.pagination-link:hover {
    background: var(--primary-light);
    border-color: var(--primary);
}

.pagination-current {
    font-size: 14px;
    color: var(--gray-600);
}

/* Filter bottom sheet */
.filter-sheet-overlay {
    position: fixed;
    inset: 0;
    background: rgba(0, 0, 0, 0.4);
    z-index: 1000;
    opacity: 0;
    visibility: hidden;
    transition: opacity var(--transition-base), visibility var(--transition-base);
}

.filter-sheet-overlay.is-open {
    opacity: 1;
    visibility: visible;
}

.filter-sheet {
    position: fixed;
    bottom: 0;
    left: 0;
    right: 0;
    max-height: 85vh;
    background: var(--white);
    border-radius: var(--radius-lg) var(--radius-lg) 0 0;
    box-shadow: 0 -4px 24px rgba(0, 0, 0, 0.15);
    z-index: 1001;
    transform: translateY(100%);
    transition: transform var(--transition-base);
    overflow: hidden;
    display: flex;
    flex-direction: column;
}

.filter-sheet.is-open {
    transform: translateY(0);
}

.filter-sheet-header {
    display: flex;
    align-items: center;
    justify-content: space-between;
    padding: var(--space-4);
    border-bottom: 1px solid var(--gray-100);
    flex-shrink: 0;
}

.filter-sheet-title {
    font-size: 18px;
    font-weight: 700;
    color: var(--black);
    margin: 0;
}

.filter-sheet-close {
    width: 40px;
    height: 40px;
    padding: 0;
    border: none;
    background: var(--gray-100);
    border-radius: var(--radius-md);
    font-size: 24px;
    line-height: 1;
    color: var(--gray-700);
    cursor: pointer;
}

.filter-sheet-close:hover {
    background: var(--gray-200);
}

.filter-sheet-form {
    padding: var(--space-4);
    overflow-y: auto;
    flex: 1;
}

.filter-sheet-group {
    margin-bottom: var(--space-4);
}

.filter-sheet-group label {
    display: block;
    font-size: 13px;
    font-weight: 600;
    color: var(--gray-700);
    margin-bottom: var(--space-2);
}

.filter-sheet-group select,
.filter-sheet-group input {
    width: 100%;
    padding: var(--space-3);
    font-size: 15px;
    border: 1px solid var(--gray-200);
    border-radius: var(--radius-md);
    background: var(--white);
}

.filter-sheet-row {
    display: grid;
    grid-template-columns: 1fr 1fr;
    gap: var(--space-4);
}

.filter-sheet-actions {
    display: flex;
    gap: var(--space-3);
    margin-top: var(--space-6);
}

.filter-sheet-actions .btn {
    flex: 1;
}

.filter-sheet-reset {
    text-align: center;
}

@media (min-width: 769px) {
    .filter-sheet {
        left: 50%;
        right: auto;
        width: 400px;
        max-height: 90vh;
        border-radius: var(--radius-lg);
        transform: translate(-50%, 100%);
    }

    .filter-sheet.is-open {
        transform: translate(-50%, 0);
    }
}

/* Infinite scroll sentinel (observed by IntersectionObserver) */
.collection-scroll-sentinel {
    height: 1px;
    width: 100%;
    visibility: hidden;
    pointer-events: none;
    margin: 0;
    padding: 0;
}

/* Loading spinner below products */
.collection-loading-spinner {
    display: flex;
    justify-content: center;
    align-items: center;
    gap: 6px;
    padding: var(--space-6) 0;
    min-height: 48px;
}

.collection-loading-spinner-dot {
    width: 8px;
    height: 8px;
    border-radius: 50%;
    background: var(--gray-400, #9ca3af);
    animation: collection-spinner-bounce 0.6s ease-in-out infinite alternate;
}

.collection-loading-spinner-dot:nth-child(2) {
    animation-delay: 0.2s;
}

.collection-loading-spinner-dot:nth-child(3) {
    animation-delay: 0.4s;
}

@keyframes collection-spinner-bounce {
    from {
        transform: scale(0.8);
        opacity: 0.6;
    }
    to {
        transform: scale(1.2);
        opacity: 1;
    }
}