/* Categories Page Styles */

/* Categories Grid */
.categories-grid {
    margin-bottom: 3rem;
    width: 100%;
    overflow-x: hidden;
    overflow-y: auto;
    scrollbar-width: thin;
    scrollbar-color: var(--border-light) var(--background-secondary);
}

/* New Card Grid Layout (top-level categories) */
.categories-card-grid {
    display: grid;
    grid-template-columns: repeat(auto-fill, minmax(280px, 1fr));
    gap: 1.5rem;
    margin: 2rem 0 3rem 0;
}

/* Base category card styles - Minimalist */
.category-card-item {
    background: var(--background-color);
    border: 1px solid var(--border-light);
    border-radius: 6px;
    transition: all 0.2s ease;
    position: relative;
}

.category-card-item::before {
    content: '';
    position: absolute;
    top: 0;
    left: 0;
    width: 3px;
    height: 100%;
    background: var(--border-light);
    transition: all 0.2s ease;
}

/* Level 0 - Root categories (main categories) */
.category-card-item.level-0::before {
    background: var(--primary-color);
}

.category-card-item.level-0:hover {
    border-color: var(--primary-color);
    box-shadow: 0 2px 8px rgba(0, 0, 0, 0.06);
}

/* Level 1 - First level subcategories */
.category-card-item.level-1::before {
    background: var(--text-tertiary);
}

.category-card-item.level-1:hover {
    border-color: var(--text-secondary);
    box-shadow: 0 1px 4px rgba(0, 0, 0, 0.04);
}

/* Categories with children - subtle indicator */
.category-card-item.has-children {
    border-left-width: 3px;
}

.category-card-item.has-children.level-0 {
    border-left-color: var(--primary-color);
}

.category-card-link {
    display: block;
    text-decoration: none;
    color: inherit;
    padding: 1.25rem;
    height: 100%;
}

.category-card-main { 
    display: flex; 
    align-items: flex-start; 
}

.category-card-info { 
    flex: 1; 
}

.category-card-title {
    font-size: 1rem;
    font-weight: 600;
    color: var(--text-color);
    margin: 0 0 .5rem 0;
    line-height: 1.4;
}

.category-card-item.level-0 .category-card-title {
    font-size: 1.1rem;
    font-weight: 700;
    color: var(--text-color);
}

.category-card-item.level-1 .category-card-title {
    font-size: 0.95rem;
    font-weight: 500;
    color: var(--text-secondary);
}

.category-card-title a {
    color: inherit;
    text-decoration: none;
}

.category-card-title a:hover {
    color: var(--primary-color);
}

.category-card-meta { 
    display: flex; 
    align-items: center; 
    flex-wrap: wrap; 
    gap: .5rem; 
}

.category-card-code { 
    font-size: .7rem; 
    background: var(--background-secondary); 
    color: var(--text-tertiary); 
    padding: .2rem .5rem; 
    border-radius: 3px; 
    font-family: var(--font-mono);
}

/* Subcategories styling - Minimalist */
.category-subcategories { 
    margin-top: .75rem; 
    display: flex; 
    flex-wrap: wrap; 
    gap: .4rem;
    padding-top: .75rem;
    border-top: 1px solid var(--border-light);
}

.subcategory-tag { 
    background: var(--background-secondary); 
    color: var(--text-secondary); 
    border-radius: 3px; 
    padding: .25rem .6rem; 
    font-size: .7rem; 
    font-weight: 500; 
    line-height: 1.3; 
    text-decoration: none;
    display: inline-block;
    transition: all 0.15s ease;
}

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

/* Level-specific subcategory styling */
.category-subcategories.level-1 .subcategory-tag {
    background: var(--border-light);
    color: var(--text-tertiary);
}

.category-subcategories.level-1 .subcategory-tag:hover {
    background: var(--text-tertiary);
    color: white;
}

/* Responsive Design - Minimalist */
@media (max-width: 768px) {
    .categories-card-grid { 
        grid-template-columns: 1fr 1fr; 
        gap: 1rem; 
    }
    
    .category-card-link { 
        padding: 1rem; 
    }
    
    .category-card-title {
        font-size: 0.95rem;
    }
    
    .category-card-item.level-0 .category-card-title {
        font-size: 1rem;
    }
    
    .category-card-item::before {
        width: 2px;
    }
}

@media (max-width: 520px) {
    .categories-card-grid { 
        grid-template-columns: 1fr; 
        gap: .8rem;
    }
    
    .category-card-link { 
        padding: .9rem; 
    }
    
    .category-card-title {
        font-size: 0.9rem;
    }
    
    .category-card-item.level-0 .category-card-title {
        font-size: 0.95rem;
    }
    
    .category-subcategories {
        gap: 0.3rem;
        margin-top: 0.6rem;
    }
    
    .subcategory-tag {
        padding: 0.2rem 0.5rem;
        font-size: 0.65rem;
    }
}

/* Custom scrollbar - Minimalist */
.categories-grid::-webkit-scrollbar {
    width: 4px;
}

.categories-grid::-webkit-scrollbar-track {
    background: var(--background-secondary);
}

.categories-grid::-webkit-scrollbar-thumb {
    background: var(--border-light);
    border-radius: 2px;
}

.categories-grid::-webkit-scrollbar-thumb:hover {
    background: var(--text-tertiary);
}

.category-group {
    margin-bottom: 3rem;
}

.category-group-title {
    font-size: 1.5rem;
    font-weight: 700;
    color: var(--text-color);
    margin: 0 0 1.5rem 0;
    padding-bottom: 0.5rem;
    border-bottom: 2px solid var(--border-light);
}

.category-cards {
    display: grid;
    grid-template-columns: repeat(auto-fill, minmax(280px, 1fr));
    gap: 1rem;
}

.category-card {
    display: flex;
    align-items: center;
    justify-content: space-between;
    background: var(--background-color);
    border: 2px solid var(--border-light);
    border-radius: var(--radius);
    padding: 1rem 1.25rem;
    text-decoration: none;
    color: inherit;
    box-shadow: var(--shadow-sm);
    transition: all 0.2s ease;
    width: 100%;
    box-sizing: border-box;
    min-width: 0;
}

.category-card:hover {
    border-color: var(--primary-color);
    box-shadow: var(--shadow-md);
    transform: translateY(-2px);
}

.category-card-content {
    flex: 1;
    min-width: 0;
    overflow: hidden;
}

.category-card-title {
    font-size: 1rem;
    font-weight: 600;
    color: var(--text-color);
    margin: 0 0 0.2rem 0;
}

.category-card-code {
    font-size: 0.85rem;
    color: var(--text-secondary);
    font-family: var(--font-mono);
    background: var(--background-secondary);
    padding: 0.25rem 0.5rem;
    border-radius: var(--radius-sm);
}

.category-children-count {
    font-size: 0.75rem;
    color: var(--primary-color);
    background: var(--primary-lighter);
    padding: 0.15rem 0.3rem;
    border-radius: var(--radius-sm);
    margin-top: 0.2rem;
    display: inline-block;
    font-weight: 500;
}

.category-card-arrow {
    font-size: 1.2rem;
    color: var(--primary-color);
    font-weight: bold;
    transition: transform 0.2s ease;
}

.category-card:hover .category-card-arrow {
    transform: translateX(4px);
}

.category-card.has-children {
    border-left: 4px solid var(--primary-color);
}

.category-card.has-children:hover {
    border-color: var(--primary-color);
    box-shadow: var(--shadow-primary-md);
}

/* Hierarchical category styles */
.category-item {
    margin-bottom: 0.5rem;
}

.category-children {
    margin-left: 1.5rem;
    margin-top: 0.25rem;
    padding-left: 0.75rem;
    border-left: 2px solid var(--primary-color);
    position: relative;
    width: calc(100% - 1.5rem);
    box-sizing: border-box;
}

.category-children::before {
    content: '';
    position: absolute;
    left: -2px;
    top: 0;
    bottom: 0;
    width: 2px;
    background: linear-gradient(to bottom, var(--primary-color), var(--primary-light));
}

.category-nested-1 .category-card {
    background: var(--background-secondary);
    border-color: var(--border-light);
    border-left: 4px solid var(--primary-color);
}

.category-nested-2 .category-card {
    background: var(--background-color);
    border-color: var(--border-light);
    border-left: 4px solid var(--primary-light);
    opacity: 0.95;
}

.category-nested-3 .category-card {
    background: var(--background-secondary);
    border-color: var(--border-light);
    border-left: 4px solid var(--border-light);
    opacity: 0.9;
}

.category-children .category-card {
    margin-bottom: 0.25rem;
    position: relative;
}

.category-children .category-card:last-child {
    margin-bottom: 0;
}

.category-children .category-card::before {
    content: '';
    position: absolute;
    left: -0.75rem;
    top: 50%;
    width: 0.4rem;
    height: 2px;
    background: var(--primary-color);
    transform: translateY(-50%);
}

/* Category level indicators */
.category-nested-1 .category-card-title::before {
    content: '└─ ';
    color: var(--primary-color);
    font-weight: bold;
}

.category-nested-2 .category-card-title::before {
    content: '  └─ ';
    color: var(--primary-light);
    font-weight: bold;
}

.category-nested-3 .category-card-title::before {
    content: '    └─ ';
    color: var(--text-secondary);
    font-weight: bold;
}

/* Call to Action */
.cta-section {
    background: var(--background-secondary);
    border-radius: var(--radius);
    padding: 3rem 2rem;
    text-align: center;
    margin: 0 1rem;
    border: 1px solid var(--border-light);
    width: calc(100% - 2rem);
    box-sizing: border-box;
}

.cta-content h2 {
    font-size: 1.5rem;
    font-weight: 700;
    color: var(--text-color);
    margin: 0 0 1rem 0;
}

.cta-content p {
    font-size: 1rem;
    color: var(--text-secondary);
    margin: 0 0 2rem 0;
    max-width: 500px;
    margin: 0 auto 2rem auto;
}

.cta-content .btn {
    display: inline-block;
    padding: 1rem 2rem;
    background: var(--primary-color);
    color: white;
    text-decoration: none;
    border-radius: var(--radius);
    font-weight: 600;
}

.cta-content .btn:hover {
    background: var(--primary-dark);
    box-shadow: var(--shadow-md);
}

/* Responsive Design */
@media (max-width: 768px) {
    .categories-grid {
        overflow-x: hidden;
        width: 100%;
    }
    
    .category-cards {
        grid-template-columns: 1fr;
        gap: 0.75rem;
    }
    
    .category-card {
        padding: 1.25rem;
    }
    
    .category-group-title {
        font-size: 1.25rem;
    }
    
    .cta-section {
        margin: 0 0.5rem;
        padding: 2rem 1rem;
    }
    
    .cta-content h2 {
        font-size: 1.25rem;
    }
    
    /* Responsive adjustments for nested categories */
.category-children {
    margin-left: 1rem;
    padding-left: 0.5rem;
}

.category-nested-1 .category-card,
.category-nested-2 .category-card,
.category-nested-3 .category-card {
    padding: 0.75rem 1rem;
}
    
    .category-children .category-card::before {
        left: -0.5rem;
        width: 0.25rem;
    }
    
    .category-children-count {
        font-size: 0.75rem;
        padding: 0.15rem 0.3rem;
    }
}

@media (max-width: 480px) {
    .categories-grid {
        overflow-x: hidden;
        width: 100%;
        max-height: 60vh;
    }
    
    .category-card {
        padding: 0.75rem;
    }
    
    .category-card-title {
        font-size: 1rem;
    }
    
    .category-children {
        margin-left: 0.5rem;
        padding-left: 0.25rem;
    }
    
    .category-nested-1 .category-card-title::before {
        content: '└─ ';
    }
    
    .category-nested-2 .category-card-title::before {
        content: '  └─ ';
    }
    
    .category-nested-3 .category-card-title::before {
        content: '    └─ ';
    }
}

/* Popular Tags Section */
.popular-tags-section {
    margin: 3rem 0;
    padding: 2rem 0;
    border-top: 1px solid var(--border-light);
}

.section-header {
    text-align: center;
    margin-bottom: 2rem;
}

.section-title {
    font-size: 1.75rem;
    font-weight: 700;
    color: var(--text-color);
    margin-bottom: 0.5rem;
}

.section-description {
    font-size: 1rem;
    color: var(--text-secondary);
    margin: 0;
}

.tags-grid {
    display: grid;
    grid-template-columns: repeat(auto-fill, minmax(200px, 1fr));
    gap: 1rem;
    margin-bottom: 2rem;
}

.tag-card {
    display: flex;
    align-items: center;
    justify-content: space-between;
    background: var(--background-color);
    border: 1px solid var(--border-light);
    border-radius: var(--radius);
    padding: 1rem;
    text-decoration: none;
    color: inherit;
    transition: all 0.2s ease;
    position: relative;
    overflow: hidden;
}

.tag-card::before {
    content: '';
    position: absolute;
    top: 0;
    left: 0;
    width: 3px;
    height: 100%;
    background: var(--secondary-color);
    transition: all 0.2s ease;
}

.tag-card:hover {
    border-color: var(--secondary-color);
    box-shadow: 0 2px 8px rgba(0, 0, 0, 0.06);
    transform: translateY(-1px);
}

.tag-card:hover::before {
    background: var(--secondary-dark);
}

.tag-card-content {
    display: flex;
    align-items: center;
    gap: 0.5rem;
    flex: 1;
}

.tag-icon {
    font-size: 1rem;
    opacity: 0.7;
}

.tag-text {
    font-size: 0.95rem;
    font-weight: 600;
    color: var(--text-color);
}

.tag-card-arrow {
    font-size: 1rem;
    color: var(--text-tertiary);
    transition: transform 0.2s ease;
}

.tag-card:hover .tag-card-arrow {
    transform: translateX(3px);
    color: var(--secondary-color);
}

.tags-cta {
    text-align: center;
    margin-top: 2rem;
}

.tags-cta .btn {
    display: inline-flex;
    align-items: center;
    gap: 0.5rem;
    padding: 0.75rem 1.5rem;
    background: var(--background-secondary);
    color: var(--text-color);
    border: 1px solid var(--border-color);
    border-radius: var(--radius);
    text-decoration: none;
    font-weight: 600;
    transition: all 0.2s ease;
}

.tags-cta .btn:hover {
    background: var(--background-color);
    border-color: var(--secondary-color);
    color: var(--text-color);
    text-decoration: none;
    transform: translateY(-1px);
    box-shadow: 0 2px 8px rgba(0, 0, 0, 0.06);
}

.no-tags-found {
    text-align: center;
    padding: 2rem;
    color: var(--text-secondary);
    grid-column: 1 / -1;
}

/* Responsive adjustments for tags */
@media (max-width: 768px) {
    .popular-tags-section {
        margin: 2rem 0;
        padding: 1.5rem 0;
    }
    
    .section-title {
        font-size: 1.5rem;
    }
    
    .tags-grid {
        grid-template-columns: repeat(auto-fill, minmax(150px, 1fr));
        gap: 0.75rem;
    }
    
    .tag-card {
        padding: 0.75rem;
    }
    
    .tag-text {
        font-size: 0.9rem;
    }
}

@media (max-width: 480px) {
    .tags-grid {
        grid-template-columns: 1fr;
        gap: 0.5rem;
    }
    
    .tag-card {
        padding: 0.75rem;
    }
    
    .section-title {
        font-size: 1.25rem;
    }
}