/* Knowledge Base Specific Styles */

.search-filter-section {
    background: var(--card-bg);
    padding: 30px;
    border-radius: 12px;
    box-shadow: var(--shadow);
    margin-bottom: 40px;
}

.search-box {
    position: relative;
    margin-bottom: 25px;
}

.search-box i {
    position: absolute;
    left: 20px;
    top: 50%;
    transform: translateY(-50%);
    color: var(--text-secondary);
    font-size: 1.2rem;
}

.search-input {
    width: 100%;
    padding: 16px 20px 16px 55px;
    border: 2px solid var(--border-color);
    border-radius: 10px;
    font-size: 1.1rem;
    transition: border-color 0.3s;
}

.search-input:focus {
    outline: none;
    border-color: var(--primary-color);
}

.filter-controls {
    display: flex;
    gap: 20px;
    flex-wrap: wrap;
    align-items: flex-end;
}

.filter-group {
    flex: 1;
    min-width: 200px;
}

.filter-group label {
    display: block;
    margin-bottom: 8px;
    font-weight: 500;
    color: var(--text-primary);
}

.filter-group label i {
    margin-right: 8px;
    color: var(--primary-color);
}

/* Category Cards */
.category-cards {
    display: grid;
    grid-template-columns: repeat(auto-fit, minmax(250px, 1fr));
    gap: 20px;
    margin-bottom: 40px;
}

.category-card {
    background: var(--card-bg);
    padding: 30px;
    border-radius: 12px;
    box-shadow: var(--shadow);
    border: 2px solid var(--border-color);
    text-align: center;
    cursor: pointer;
    transition: all 0.3s;
}

.category-card:hover {
    transform: translateY(-5px);
    box-shadow: var(--shadow-lg);
    border-color: var(--primary-color);
}

.category-card i {
    font-size: 3rem;
    color: var(--primary-color);
    margin-bottom: 15px;
}

.category-card h3 {
    font-size: 1.3rem;
    margin-bottom: 10px;
    color: var(--text-primary);
}

.category-count {
    color: var(--text-secondary);
    font-size: 0.95rem;
}

/* Articles List */
.articles-grid {
    display: grid;
    gap: 25px;
}

.article-card {
    background: var(--card-bg);
    border-radius: 12px;
    padding: 30px;
    box-shadow: var(--shadow);
    border: 1px solid var(--border-color);
    transition: all 0.3s;
    cursor: pointer;
}

.article-card:hover {
    transform: translateY(-3px);
    box-shadow: var(--shadow-lg);
}

.article-header {
    display: flex;
    justify-content: space-between;
    align-items: flex-start;
    margin-bottom: 15px;
    gap: 15px;
}

.article-title {
    font-size: 1.5rem;
    font-weight: 600;
    color: var(--text-primary);
    margin: 0;
    flex: 1;
}

.article-badges {
    display: flex;
    gap: 8px;
    flex-wrap: wrap;
}

.article-summary {
    color: var(--text-secondary);
    line-height: 1.7;
    margin: 15px 0;
}

.article-meta {
    display: flex;
    flex-wrap: wrap;
    gap: 20px;
    margin-top: 20px;
    padding-top: 20px;
    border-top: 1px solid var(--border-color);
    font-size: 0.9rem;
    color: var(--text-secondary);
}

.meta-item {
    display: flex;
    align-items: center;
    gap: 6px;
}

.meta-item i {
    color: var(--primary-color);
}

/* Article Tags */
.article-tags {
    display: flex;
    flex-wrap: wrap;
    gap: 8px;
    margin-top: 15px;
}

.tag {
    background: var(--bg-color);
    color: var(--text-secondary);
    padding: 4px 12px;
    border-radius: 15px;
    font-size: 0.85rem;
    border: 1px solid var(--border-color);
}

/* Loading State */
.loading-state {
    text-align: center;
    padding: 60px 20px;
}

.loading-state p {
    margin-top: 20px;
    color: var(--text-secondary);
    font-size: 1.1rem;
}

/* Empty State */
.empty-state {
    text-align: center;
    padding: 80px 20px;
}

.empty-state i {
    font-size: 5rem;
    color: var(--border-color);
    margin-bottom: 20px;
}

.empty-state h3 {
    font-size: 1.8rem;
    margin-bottom: 15px;
    color: var(--text-primary);
}

.empty-state p {
    color: var(--text-secondary);
    font-size: 1.1rem;
    margin-bottom: 30px;
}

/* Pagination */
.pagination-container {
    display: flex;
    justify-content: center;
    align-items: center;
    gap: 20px;
    margin-top: 40px;
    padding: 20px;
}

.page-info {
    font-weight: 500;
    color: var(--text-primary);
}

/* Modal */
.modal {
    position: fixed;
    top: 0;
    left: 0;
    right: 0;
    bottom: 0;
    background: rgba(0, 0, 0, 0.7);
    display: flex;
    align-items: center;
    justify-content: center;
    z-index: 2000;
    padding: 20px;
    overflow-y: auto;
}

.modal-content {
    background: var(--card-bg);
    border-radius: 16px;
    max-width: 900px;
    width: 100%;
    max-height: 90vh;
    overflow-y: auto;
    box-shadow: 0 20px 60px rgba(0, 0, 0, 0.3);
}

.modal-header {
    display: flex;
    justify-content: space-between;
    align-items: flex-start;
    padding: 30px;
    border-bottom: 2px solid var(--border-color);
    gap: 20px;
}

.modal-header h2 {
    flex: 1;
    margin: 0;
    color: var(--text-primary);
}

.modal-close {
    background: none;
    border: none;
    font-size: 1.5rem;
    color: var(--text-secondary);
    cursor: pointer;
    padding: 5px;
    transition: color 0.3s;
}

.modal-close:hover {
    color: var(--danger-color);
}

.modal-body {
    padding: 30px;
}

.article-content {
    line-height: 1.8;
    color: var(--text-primary);
    margin: 30px 0;
}

.article-content h3 {
    margin-top: 30px;
    margin-bottom: 15px;
    color: var(--text-primary);
}

.article-content p {
    margin-bottom: 15px;
}

.article-content ul,
.article-content ol {
    margin: 15px 0 15px 30px;
}

.article-content li {
    margin-bottom: 10px;
}

.article-actions {
    display: flex;
    gap: 15px;
    margin-top: 30px;
    padding-top: 30px;
    border-top: 2px solid var(--border-color);
}

/* Difficulty badges */
.badge.difficulty-beginner {
    background: var(--success-color);
}

.badge.difficulty-intermediate {
    background: var(--warning-color);
}

.badge.difficulty-advanced {
    background: var(--danger-color);
}

/* Responsive Design */
@media (max-width: 768px) {
    .filter-controls {
        flex-direction: column;
        align-items: stretch;
    }

    .filter-group {
        width: 100%;
    }

    .category-cards {
        grid-template-columns: 1fr;
    }

    .article-header {
        flex-direction: column;
    }

    .article-badges {
        width: 100%;
    }

    .modal-content {
        max-height: 100vh;
        border-radius: 0;
    }

    .article-actions {
        flex-direction: column;
    }

    .article-actions button {
        width: 100%;
    }
}