/* ========================================
   Reset & Base Styles
   ======================================== */

* {
    margin: 0;
    padding: 0;
    box-sizing: border-box;
}

:root {
    /* Soft, neutral color palette */
    --color-primary: #8b9b8f;
    --color-secondary: #c9bfb0;
    --color-accent: #d4a574;
    --color-light: #f5f3f0;
    --color-dark: #3a3a3a;
    --color-border: #e8e5e0;
    --color-hover: #c9bfb0;
    --color-text: #4a4a4a;
    
    --spacing-xs: 0.5rem;
    --spacing-sm: 1rem;
    --spacing-md: 1.5rem;
    --spacing-lg: 2rem;
    --spacing-xl: 3rem;
    
    --font-sans: -apple-system, BlinkMacSystemFont, 'Segoe UI', Roboto, 'Helvetica Neue', Arial, sans-serif;
    --border-radius: 8px;
    --transition: all 0.3s ease;
}

body {
    font-family: var(--font-sans);
    color: var(--color-text);
    background-color: var(--color-light);
    line-height: 1.6;
}

/* ========================================
   Layout Structure
   ======================================== */

.app-container {
    display: flex;
    flex-direction: column;
    min-height: 100vh;
}

.header {
    background: linear-gradient(135deg, var(--color-primary) 0%, var(--color-secondary) 100%);
    color: white;
    padding: var(--spacing-xl) var(--spacing-lg);
    text-align: center;
    box-shadow: 0 2px 8px rgba(0, 0, 0, 0.1);
}

/* Keep the header (including hamburger) visible while scrolling */
.header {
    position: sticky;
    top: 0;
    z-index: 500;
}

.header-content {
    max-width: 1200px;
    margin: 0 auto;
}

.site-title {
    font-size: 2.5rem;
    font-weight: 700;
    margin-bottom: var(--spacing-xs);
    letter-spacing: -0.5px;
}

.site-description {
    font-size: 1rem;
    opacity: 0.95;
    font-weight: 300;
}

.sidebar-toggle-btn {
    display: none;
    background: rgba(255, 255, 255, 0.15);
    border: 1px solid rgba(255, 255, 255, 0.3);
    color: white;
    font-size: 1.3rem;
    padding: 0.45rem 0.8rem;
    border-radius: 0.4rem;
    cursor: pointer;
    margin-bottom: var(--spacing-sm);
}

.sidebar-toggle-btn:hover {
    background: rgba(255, 255, 255, 0.25);
}


.main-content {
    flex: 1;
    padding: var(--spacing-lg);
    max-width: 1400px;
    width: 100%;
    margin: 0 auto;
}

.search-section {
    margin-bottom: var(--spacing-lg);
}

.search-box {
    position: relative;
    max-width: 600px;
    margin: 0 auto var(--spacing-lg);
}

.search-input {
    width: 100%;
    padding: var(--spacing-sm) var(--spacing-md);
    font-size: 1rem;
    border: 2px solid var(--color-border);
    border-radius: var(--border-radius);
    transition: var(--transition);
    background-color: white;
}

.search-input:focus {
    outline: none;
    border-color: var(--color-primary);
    box-shadow: 0 0 0 3px rgba(139, 155, 143, 0.1);
}

.clear-search-btn {
    position: absolute;
    right: var(--spacing-sm);
    top: 50%;
    transform: translateY(-50%);
    background: none;
    border: none;
    font-size: 1.5rem;
    color: var(--color-text);
    cursor: pointer;
    padding: var(--spacing-xs);
    transition: var(--transition);
}

.clear-search-btn:hover {
    color: var(--color-primary);
}

/* ========================================
   Content Wrapper (Sidebar + Products)
   ======================================== */

.content-wrapper {
    display: grid;
    grid-template-columns: 250px 1fr;
    gap: var(--spacing-lg);
}

.sidebar {
    display: flex;
    flex-direction: column;
}

.category-menu {
    background-color: white;
    border-radius: var(--border-radius);
    padding: var(--spacing-md);
    box-shadow: 0 2px 4px rgba(0, 0, 0, 0.05);
    position: sticky;
    top: var(--spacing-lg);
}

.category-menu-header {
    font-weight: 600;
    color: var(--color-primary);
    margin-bottom: var(--spacing-md);
    font-size: 1.1rem;
}

.category-tree {
    display: flex;
    flex-direction: column;
    gap: 0.1rem; /* tighter spacing between menu entries */
}

.category-tree details {
    border: 1px solid var(--color-lighter);
    border-radius: 4px;
    background-color: var(--color-surface);
    padding: 0.2rem;
    margin-bottom: 0.1rem;
}

.category-tree summary {
    list-style: none;
    outline: none;
}

.category-tree summary::-webkit-details-marker {
    display: none;
}

.category-tree summary:focus,
.category-tree .category-item:focus {
    box-shadow: 0 0 0 2px var(--color-primary);
    outline: none;
}

.category-item {
    cursor: pointer;
    padding: 0.3rem 0.5rem;
    border-radius: 4px;
    transition: var(--transition);
    color: var(--color-text);
    font-size: 0.95rem;
    border-left: 3px solid transparent;
}

.category-item:hover {
    background-color: var(--color-light);
    border-left-color: var(--color-primary);
}

.category-item.active {
    background-color: var(--color-light);
    color: var(--color-primary);
    font-weight: 600;
    border-left-color: var(--color-primary);
}

.category-item.nested-level-1 {
    padding-left: 1.5rem;
}

.category-item.nested-level-2 {
    padding-left: 2.5rem;
}

.category-item.nested-level-3 {
    padding-left: 3.5rem;
}

/* ========================================
   Product Section
   ======================================== */

.product-section {
    display: flex;
    flex-direction: column;
}

.products-container {
    display: grid;
    grid-template-columns: repeat(auto-fill, minmax(320px, 1fr));
    gap: var(--spacing-lg);
    margin-bottom: var(--spacing-lg);
}

/* ========================================
   Product Card
   ======================================== */

.product-card {
    background-color: white;
    border-radius: var(--border-radius);
    padding: var(--spacing-md);
    box-shadow: 0 2px 8px rgba(0, 0, 0, 0.08);
    transition: var(--transition);
    display: flex;
    flex-direction: column;
    height: 100%;
}

.product-card:hover {
    box-shadow: 0 4px 12px rgba(0, 0, 0, 0.12);
    transform: translateY(-2px);
}

.product-card-header {
    display: flex;
    align-items: center;
    gap: var(--spacing-xs);
    margin-bottom: var(--spacing-xs);
}

.product-link {
    display: inline-block;
    color: var(--color-primary);
    text-decoration: none;
    font-weight: 600;
    font-size: 1.1rem;
    transition: var(--transition);
    word-break: break-word;
}

.product-link:hover {
    color: var(--color-accent);
    text-decoration: underline;
}

/* Countries */
.countries {
    margin: var(--spacing-xs) 0;
    font-size: 1.5rem;
    line-height: 1.4;
    display: flex;
    gap: var(--spacing-xs);
    flex-wrap: wrap;
}

.country-btn {
    background: none;
    border: 1px solid transparent;
    font-size: 1.5rem;
    padding: 0.2rem 0.5rem;
    cursor: pointer;
    transition: var(--transition);
    border-radius: 0.3rem;
    display: inline-flex;
    align-items: center;
}

.country-btn:hover {
    background-color: rgba(139, 155, 143, 0.15);
    border-color: rgba(139, 155, 143, 0.3);
    transform: scale(1.08);
}

.country-hq-btn {
    background: none;
    border: 1px solid rgba(0, 0, 0, 0.08);
    color: inherit;
    font-size: 1.3rem;
    margin-right: 0.4rem;
    padding: 0.1rem 0.4rem;
    border-radius: 0.3rem;
    cursor: pointer;
}

.country-hq-btn:hover {
    background-color: rgba(139, 155, 143, 0.12);
    border-color: rgba(139, 155, 143, 0.3);
    transform: scale(1.03);
}

/* Tags */
.tags-container {
    margin: var(--spacing-xs) 0;
}

.tags-label {
    font-size: 0.85rem;
    color: var(--color-text);
    opacity: 0.7;
    margin-bottom: var(--spacing-xs);
    text-transform: uppercase;
    letter-spacing: 0.5px;
}

.tags-list {
    display: flex;
    flex-wrap: wrap;
    gap: var(--spacing-xs);
}

.tag {
    display: inline-block;
    background-color: var(--color-light);
    color: var(--color-primary);
    padding: var(--spacing-xs) var(--spacing-sm);
    border-radius: 4px;
    font-size: 0.85rem;
    cursor: pointer;
    transition: var(--transition);
    border: 1px solid var(--color-border);
}

@media (min-width: 1024px) {
    .tag {
        padding: 0.15rem 0.4rem;
        font-size: 0.78rem;
    }

    .tags-expand-btn {
        padding: 0.15rem 0.4rem;
        font-size: 0.78rem;
    }
}

.tag:hover {
    background-color: var(--color-secondary);
    color: white;
    border-color: var(--color-secondary);
}

.tags-expand-btn {
    background-color: var(--color-light);
    color: var(--color-primary);
    padding: var(--spacing-xs) var(--spacing-sm);
    border: 1px solid var(--color-border);
    border-radius: 4px;
    font-size: 0.85rem;
    cursor: pointer;
    transition: var(--transition);
}

.tags-expand-btn:hover {
    background-color: var(--color-hover);
    color: white;
}

.tags-list.expanded {
    /* Show all tags when expanded */
}

/* Confirmation */
.confirmation {
    margin: var(--spacing-md) 0;
    padding: var(--spacing-sm);
    background-color: var(--color-light);
    border-left: 3px solid var(--color-accent);
    border-radius: 4px;
}

.confirmation-link {
    color: var(--color-accent);
    text-decoration: none;
    font-size: 0.95rem;
    transition: var(--transition);
}

.confirmation-link:hover {
    text-decoration: underline;
    color: var(--color-primary);
}

/* Note */
.note {
    font-size: 0.9rem;
    color: var(--color-text);
    opacity: 0.7;
    font-style: italic;
    margin: var(--spacing-sm) 0;
}

/* Card Footer */
.product-card-footer {
    margin-top: auto;
    padding-top: var(--spacing-md);
    border-top: 1px solid var(--color-border);
    display: flex;
    gap: var(--spacing-sm);
    flex-wrap: wrap;
}

.card-action-link {
    font-size: 0.85rem;
    color: var(--color-primary);
    text-decoration: none;
    transition: var(--transition);
}

.card-action-link:hover {
    color: var(--color-accent);
}

/* ========================================
   Pagination
   ======================================== */

.pagination-wrapper {
    display: flex;
    justify-content: center;
    margin-top: var(--spacing-lg);
}

.pagination-wrapper.top-pagination {
    margin-top: 0;
    margin-bottom: var(--spacing-lg);
}

.pagination {
    display: flex;
    gap: var(--spacing-xs);
    flex-wrap: wrap;
    justify-content: center;
}

.pagination-btn {
    padding: var(--spacing-xs) var(--spacing-sm);
    background-color: white;
    border: 1px solid var(--color-border);
    border-radius: 4px;
    cursor: pointer;
    transition: var(--transition);
    font-size: 0.95rem;
    color: var(--color-text);
}

.pagination-btn:hover:not(:disabled) {
    background-color: var(--color-light);
    border-color: var(--color-primary);
}

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

.pagination-btn:disabled {
    opacity: 0.5;
    cursor: not-allowed;
}

/* ========================================
   Footer
   ======================================== */

.footer {
    background-color: var(--color-primary);
    color: white;
    padding: var(--spacing-lg);
    text-align: center;
    margin-top: var(--spacing-xl);
}

.footer-content {
    max-width: 1200px;
    margin: 0 auto;
}

.footer-link {
    color: white;
    text-decoration: none;
    transition: var(--transition);
    font-weight: 500;
}

.footer-link:hover {
    opacity: 0.8;
    text-decoration: underline;
}

/* ========================================
   No Results Message
   ======================================== */

.no-results {
    text-align: center;
    padding: var(--spacing-xl);
    color: var(--color-text);
    opacity: 0.7;
}

.no-results-icon {
    font-size: 3rem;
    margin-bottom: var(--spacing-md);
}

.no-results-text {
    font-size: 1.1rem;
}

/* ========================================
   Responsive Design
   ======================================== */

@media (max-width: 1024px) {
    .site-title {
        font-size: 2rem;
    }
    
    .content-wrapper {
        grid-template-columns: 200px 1fr;
        gap: var(--spacing-md);
    }
    
    .products-container {
        grid-template-columns: repeat(auto-fill, minmax(280px, 1fr));
    }
}

@media (max-width: 768px) {
    .sidebar-toggle-btn {
        display: inline-flex;
        align-items: center;
        justify-content: center;
    }

    .main-content {
        padding: var(--spacing-md);
    }
    
    .content-wrapper {
        grid-template-columns: 1fr;
    }
    
    .sidebar {
        order: 2;
        position: fixed;
        top: 0;
        left: -280px;
        width: 260px;
        height: 100vh;
        z-index: 1000;
        padding: var(--spacing-md);
        background: white;
        box-shadow: 2px 0 12px rgba(0,0,0,0.15);
        transition: left 0.25s ease;
        overflow-y: auto;
        -webkit-overflow-scrolling: touch;
    }

    .sidebar.open {
        left: 0;
    }

    .sidebar-backdrop {
        display: none;
        position: fixed;
        inset: 0;
        background: rgba(0, 0, 0, 0.45);
        z-index: 900;
    }

    .sidebar-backdrop.active {
        display: block;
    }

    .product-section {
        order: 1;
    }

    .category-menu {
        position: static;
        top: auto;
        box-shadow: none;
        background: transparent;
        padding: var(--spacing-lg) 0 0 0;
    }
    
    .products-container {
        grid-template-columns: 1fr;
    }
    
    .site-title {
        font-size: 1.8rem;
    }
    
    .site-description {
        font-size: 0.95rem;
    }
    
    .header {
        padding: var(--spacing-md);
    }
}

@media (min-width: 769px) {
    .sidebar-toggle-btn {
        display: none;
    }

    .sidebar {
        position: static;
        width: auto;
        height: auto;
        box-shadow: none;
        padding: 0;
        order: 0;
    }

    .sidebar-backdrop {
        display: none !important;
    }

    .content-wrapper {
        grid-template-columns: 250px 1fr;
    }

    .category-menu {
        position: sticky;
        top: var(--spacing-lg);
        background-color: white;
        box-shadow: 0 2px 4px rgba(0, 0, 0, 0.05);
        padding: var(--spacing-md);
    }
}

@media (max-width: 480px) {
    .site-title {
        font-size: 1.5rem;
    }
    
    .search-input {
        padding: var(--spacing-sm) var(--spacing-xs);
    }
    
    .product-card {
        padding: var(--spacing-sm);
    }
    
    .countries {
        font-size: 1.3rem;
        letter-spacing: 1px;
    }
    
    .tag {
        font-size: 0.75rem;
        padding: 0.35rem 0.6rem;
    }
}

/* ========================================
   Loading State
   ======================================== */

.loading {
    opacity: 0.6;
    pointer-events: none;
}

.skeleton {
    background: linear-gradient(90deg, var(--color-light) 25%, var(--color-border) 50%, var(--color-light) 75%);
    background-size: 200% 100%;
    animation: loading 1.5s infinite;
}

@keyframes loading {
    0% {
        background-position: 200% 0;
    }
    100% {
        background-position: -200% 0;
    }
}

/* Virtual scrolling optimization */
.product-card.lazy-load {
    /* Content still exists in DOM but can be optimized by browser */
    content-visibility: auto;
}

/* Performance hints for browser */
.products-container {
    contain: layout style paint;
}