/* ==========================================
   Page Header
========================================== */
.page-header {
    padding: 120px 0 60px;
    background: var(--color-bg-light);
    text-align: center;
}

.page-title {
    font-family: var(--font-en);
    font-size: 3rem;
    font-weight: 400;
    letter-spacing: 0.2em;
    margin-bottom: var(--spacing-sm);
}

.page-subtitle {
    font-size: 0.9rem;
    color: var(--color-text-light);
    letter-spacing: 0.1em;
}

/* ==========================================
   Collection Section
========================================== */
.collection-section {
    padding: var(--spacing-xxl) 0;
}

/* Category Filter */
.category-filter {
    display: flex;
    flex-wrap: wrap;
    justify-content: center;
    gap: var(--spacing-sm);
    margin-bottom: var(--spacing-lg);
}

.filter-btn {
    padding: 10px 24px;
    border: 1px solid var(--color-border);
    background: white;
    color: var(--color-text);
    font-size: 0.875rem;
    letter-spacing: 0.05em;
    transition: var(--transition);
    cursor: pointer;
}

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

.filter-btn.active {
    background: var(--color-primary);
    color: white;
    border-color: var(--color-primary);
}

/* Stock Note */
.stock-note {
    background: var(--color-bg-light);
    padding: var(--spacing-md);
    margin-bottom: var(--spacing-xl);
    border-left: 3px solid var(--color-secondary);
}

.stock-note p {
    font-size: 0.875rem;
    line-height: 1.8;
    color: var(--color-text-light);
}

/* ==========================================
   Masonry Grid
========================================== */
.masonry-grid {
    display: grid;
    grid-template-columns: repeat(2, 1fr);
    gap: var(--spacing-md);
}

.masonry-item {
    position: relative;
    overflow: hidden;
    opacity: 1;
    transition: opacity 0.3s ease, transform 0.3s ease;
}

.masonry-item.hidden {
    display: none;
}

.masonry-item:hover {
    transform: translateY(-5px);
}

/* Item Image */
.item-image {
    position: relative;
    aspect-ratio: 3/4;
    overflow: hidden;
    background: var(--color-bg-light);
}

.item-image img {
    width: 100%;
    height: 100%;
    object-fit: cover;
    transition: transform 0.5s ease;
}

.masonry-item:hover .item-image img {
    transform: scale(1.1);
}

/* Item Overlay */
.item-overlay {
    position: absolute;
    top: 0;
    left: 0;
    width: 100%;
    height: 100%;
    background: rgba(139, 115, 85, 0.8);
    display: flex;
    align-items: center;
    justify-content: center;
    opacity: 0;
    transition: opacity 0.3s ease;
}

.masonry-item:hover .item-overlay {
    opacity: 1;
}

.view-detail {
    color: white;
    font-size: 0.875rem;
    letter-spacing: 0.15em;
    border-bottom: 1px solid white;
    padding-bottom: 4px;
}

/* Stock Badge */
.stock-badge {
    position: absolute;
    top: var(--spacing-sm);
    left: var(--spacing-sm);
    background: rgba(0, 0, 0, 0.7);
    color: white;
    padding: 6px 12px;
    font-size: 0.7rem;
    letter-spacing: 0.1em;
    z-index: 10;
}

/* Item Info */
.item-info {
    padding: var(--spacing-sm) 0;
}

.item-title {
    font-size: 0.9rem;
    font-weight: 400;
    text-align: center;
    letter-spacing: 0.05em;
}

/* ==========================================
   Responsive Design - Tablet
========================================== */
@media (min-width: 768px) {
    .page-title {
        font-size: 4rem;
    }

    .masonry-grid {
        grid-template-columns: repeat(3, 1fr);
        gap: var(--spacing-lg);
    }

    .category-filter {
        gap: var(--spacing-md);
    }

    .filter-btn {
        padding: 12px 30px;
    }
}

/* ==========================================
   Responsive Design - Desktop
========================================== */
@media (min-width: 1024px) {
    .masonry-grid {
        grid-template-columns: repeat(4, 1fr);
    }

    .page-title {
        font-size: 5rem;
    }
}