/**
 * ============================================================================
 * BLOG STYLES - Performance-First Design
 * ============================================================================
 * Uses CSS variables from mainstyles.css
 * Follows the same layout pattern as about.html / contact.html / help-desk.html
 * Optimized for Core Web Vitals and fast loading
 * ============================================================================
 */

/* ==================== BLOG INDEX PAGE ==================== */

/* Blog Cards Grid */
.blog-posts-grid {
    display: grid;
    grid-template-columns: repeat(auto-fill, minmax(320px, 1fr));
    gap: var(--spacing-xl);
    margin-top: var(--spacing-2xl);
}

/* Individual Blog Card */
.blog-card {
    background: var(--background);
    border-radius: var(--radius-lg);
    overflow: hidden;
    box-shadow: var(--shadow-md);
    transition: all var(--transition-base);
    display: flex;
    flex-direction: column;
    text-decoration: none;
    color: inherit;
    border: 1px solid var(--border-color);
}

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

/* Featured Badge */
.featured-badge {
    position: absolute;
    top: 12px;
    right: 12px;
    background: var(--primary-color);
    color: white;
    padding: 4px 12px;
    border-radius: var(--radius-md);
    font-size: var(--font-size-xs);
    font-weight: 600;
    text-transform: uppercase;
    letter-spacing: 0.5px;
    z-index: 2;
}

/* Blog Card Image */
.blog-card-image {
    position: relative;
    width: 100%;
    height: 200px;
    background: var(--background-dark);
    overflow: hidden;
}

.blog-card-image img {
    width: 100%;
    height: 100%;
    object-fit: cover;
    transition: transform var(--transition-slow);
}

.blog-card:hover .blog-card-image img {
    transform: scale(1.05);
}

/* Fallback for missing images */
.blog-card-image-placeholder {
    width: 100%;
    height: 100%;
    background: linear-gradient(135deg, var(--primary-color) 0%, var(--primary-shade) 100%);
    display: flex;
    align-items: center;
    justify-content: center;
}

.blog-card-image-placeholder i {
    font-size: 64px;
    color: rgba(255, 255, 255, 0.3);
}

/* Blog Card Content */
.blog-card-content {
    padding: var(--spacing-lg);
    flex: 1;
    display: flex;
    flex-direction: column;
}

.blog-card-category {
    display: inline-flex;
    align-items: center;
    gap: 6px;
    color: var(--primary-color);
    font-size: var(--font-size-sm);
    font-weight: 600;
    text-transform: uppercase;
    letter-spacing: 0.5px;
    margin-bottom: var(--spacing-sm);
}

.blog-card-category i {
    font-size: 14px;
}

.blog-card-title {
    font-size: var(--font-size-xl);
    font-weight: 700;
    color: var(--text-dark);
    margin-bottom: var(--spacing-sm);
    line-height: 1.3;
}

.blog-card-excerpt {
    font-size: var(--font-size-sm);
    color: var(--text-light);
    line-height: 1.6;
    margin-bottom: var(--spacing-md);
    flex: 1;
}

.blog-card-meta {
    display: flex;
    align-items: center;
    justify-content: space-between;
    padding-top: var(--spacing-sm);
    border-top: 1px solid var(--border-color);
    font-size: var(--font-size-xs);
    color: var(--text-muted);
}

.blog-card-date {
    display: flex;
    align-items: center;
    gap: 6px;
}

.blog-card-readtime {
    display: flex;
    align-items: center;
    gap: 6px;
}

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

.category-filter-btn {
    padding: 10px 20px;
    background: var(--background);
    border: 2px solid var(--border-color);
    border-radius: var(--radius-lg);
    color: var(--text-light);
    font-size: var(--font-size-sm);
    font-weight: 600;
    cursor: pointer;
    transition: all var(--transition-fast);
}

.category-filter-btn:hover {
    border-color: var(--primary-color);
    color: var(--primary-color);
    background: #fef2f2;
}

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

.category-filter-btn i {
    margin-right: 6px;
}

/* Pagination */
.blog-pagination {
    display: flex;
    justify-content: center;
    align-items: center;
    gap: var(--spacing-sm);
    margin-top: var(--spacing-2xl);
    padding-top: var(--spacing-xl);
    border-top: 1px solid var(--border-color);
}

.pagination-btn {
    padding: 10px 16px;
    background: var(--background);
    border: 2px solid var(--border-color);
    border-radius: var(--radius-md);
    color: var(--text-light);
    font-size: var(--font-size-sm);
    font-weight: 600;
    cursor: pointer;
    transition: all var(--transition-fast);
    min-width: 44px;
    text-align: center;
}

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

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

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

/* ==================== SINGLE BLOG POST PAGE ==================== */

/* Article Header */
.article-header {
    margin-bottom: var(--spacing-xl);
    padding-bottom: var(--spacing-lg);
    border-bottom: 2px solid var(--border-color);
}

.article-category {
    display: inline-flex;
    align-items: center;
    gap: 6px;
    color: var(--primary-color);
    font-size: var(--font-size-sm);
    font-weight: 600;
    text-transform: uppercase;
    letter-spacing: 0.5px;
    margin-bottom: var(--spacing-md);
}

.article-title {
    font-size: var(--font-size-4xl);
    font-weight: 700;
    color: var(--text-dark);
    line-height: 1.2;
    margin-bottom: var(--spacing-md);
}

.article-meta {
    display: flex;
    align-items: center;
    flex-wrap: wrap;
    gap: var(--spacing-md);
    color: var(--text-muted);
    font-size: var(--font-size-sm);
}

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

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

/* Tags */
.article-tags {
    display: flex;
    flex-wrap: wrap;
    gap: 8px;
    margin-top: var(--spacing-md);
}

.article-tag {
    padding: 4px 12px;
    background: var(--background-dark);
    border-radius: var(--radius-md);
    font-size: var(--font-size-xs);
    color: var(--text-light);
    border: 1px solid var(--border-color);
}

/* Table of Contents */
.table-of-contents {
    background: #fef2f2;
    border-left: 4px solid var(--primary-color);
    padding: var(--spacing-lg);
    border-radius: var(--radius-md);
    margin: var(--spacing-xl) 0;
}

.table-of-contents h2 {
    font-size: var(--font-size-xl);
    font-weight: 700;
    color: var(--text-dark);
    margin: 0 0 var(--spacing-md) 0;
    padding: 0;
    border: none;
}

.table-of-contents ul {
    list-style: none;
    margin: 0;
    padding: 0;
}

.table-of-contents li {
    margin-bottom: 8px;
}

.table-of-contents a {
    color: var(--text-light);
    text-decoration: none;
    transition: color var(--transition-fast);
    display: flex;
    align-items: start;
    gap: 8px;
}

.table-of-contents a:hover {
    color: var(--primary-color);
}

.table-of-contents a::before {
    content: "→";
    color: var(--primary-color);
    font-weight: 700;
    flex-shrink: 0;
}

/* Nested TOC items */
.table-of-contents ul ul {
    margin-left: var(--spacing-lg);
    margin-top: 8px;
}

/* Article Content */
.article-content {
    font-size: var(--font-size-base);
    line-height: 1.8;
    color: var(--text-light);
}

.article-content h2 {
    font-size: var(--font-size-3xl);
    font-weight: 700;
    color: var(--text-dark);
    margin: var(--spacing-2xl) 0 var(--spacing-lg);
    padding-bottom: 12px;
    border-bottom: 3px solid var(--primary-color);
    scroll-margin-top: 100px;
}

.article-content h3 {
    font-size: var(--font-size-2xl);
    font-weight: 600;
    color: var(--text-dark);
    margin: var(--spacing-xl) 0 var(--spacing-md);
    scroll-margin-top: 100px;
}

.article-content h4 {
    font-size: var(--font-size-xl);
    font-weight: 600;
    color: var(--text-dark);
    margin: var(--spacing-lg) 0 var(--spacing-sm);
}

.article-content p {
    margin-bottom: var(--spacing-md);
}

.article-content ul,
.article-content ol {
    margin: var(--spacing-md) 0 var(--spacing-md) var(--spacing-lg);
}

.article-content li {
    margin-bottom: var(--spacing-xs);
}

.article-content a {
    color: var(--primary-color);
    text-decoration: underline;
    transition: color var(--transition-fast);
}

.article-content a:hover {
    color: var(--primary-shade);
}

.article-content strong {
    color: var(--text-dark);
    font-weight: 600;
}

.article-content code {
    background: var(--background-dark);
    padding: 2px 6px;
    border-radius: var(--radius-sm);
    font-family: 'Courier New', monospace;
    font-size: 0.9em;
    color: var(--accent-red);
}

.article-content pre {
    background: var(--background-dark);
    padding: var(--spacing-md);
    border-radius: var(--radius-md);
    overflow-x: auto;
    margin: var(--spacing-lg) 0;
}

.article-content pre code {
    background: none;
    padding: 0;
    color: var(--text-dark);
}

/* Highlight boxes in articles */
.article-content .highlight-box {
    background: #fef2f2;
    border-left: 4px solid var(--primary-color);
    padding: var(--spacing-md) var(--spacing-lg);
    border-radius: var(--radius-md);
    margin: var(--spacing-lg) 0;
}

.article-content .highlight-box p:last-child {
    margin-bottom: 0;
}

/* Related Resources Section */
.related-resources {
    background: linear-gradient(135deg, var(--primary-color) 0%, var(--primary-shade) 100%);
    color: white;
    padding: var(--spacing-xl);
    border-radius: var(--radius-lg);
    margin: var(--spacing-2xl) 0;
}

.related-resources h2 {
    color: white;
    margin: 0 0 var(--spacing-lg) 0;
    padding: 0;
    border: none;
    font-size: var(--font-size-2xl);
}

.related-resources-grid {
    display: grid;
    grid-template-columns: repeat(auto-fit, minmax(250px, 1fr));
    gap: var(--spacing-md);
}

.resource-card {
    background: rgba(255, 255, 255, 0.1);
    padding: var(--spacing-md);
    border-radius: var(--radius-md);
    text-decoration: none;
    color: white;
    transition: all var(--transition-base);
    border: 2px solid transparent;
}

.resource-card:hover {
    background: rgba(255, 255, 255, 0.2);
    border-color: white;
    transform: translateY(-3px);
}

.resource-card i {
    font-size: 24px;
    margin-bottom: var(--spacing-sm);
    display: block;
}

.resource-card h3 {
    font-size: var(--font-size-lg);
    font-weight: 600;
    margin: 0;
}

/* Related Posts Section */
.related-posts {
    margin-top: var(--spacing-2xl);
    padding-top: var(--spacing-2xl);
    border-top: 2px solid var(--border-color);
}

.related-posts h2 {
    font-size: var(--font-size-3xl);
    font-weight: 700;
    color: var(--text-dark);
    margin-bottom: var(--spacing-xl);
    text-align: center;
}

.related-posts-grid {
    display: grid;
    grid-template-columns: repeat(auto-fit, minmax(280px, 1fr));
    gap: var(--spacing-lg);
}

/* Category Pages */
.category-header {
    text-align: center;
    margin-bottom: var(--spacing-xl);
    padding: var(--spacing-xl);
    background: #fef2f2;
    border-radius: var(--radius-lg);
}

.category-icon {
    width: 80px;
    height: 80px;
    background: linear-gradient(135deg, var(--primary-color) 0%, var(--primary-shade) 100%);
    border-radius: 50%;
    display: flex;
    align-items: center;
    justify-content: center;
    margin: 0 auto var(--spacing-md);
}

.category-icon i {
    font-size: 36px;
    color: white;
}

.category-header h1 {
    font-size: var(--font-size-4xl);
    font-weight: 700;
    color: var(--text-dark);
    margin-bottom: var(--spacing-sm);
}

.category-header p {
    font-size: var(--font-size-lg);
    color: var(--text-light);
}

/* Responsive Design */
@media (max-width: 968px) {
    .blog-posts-grid {
        grid-template-columns: repeat(auto-fill, minmax(280px, 1fr));
        gap: var(--spacing-lg);
    }

    .article-title {
        font-size: var(--font-size-3xl);
    }

    .article-content h2 {
        font-size: var(--font-size-2xl);
    }

    .article-content h3 {
        font-size: var(--font-size-xl);
    }

    .related-resources-grid {
        grid-template-columns: 1fr;
    }
}

@media (max-width: 640px) {
    .blog-posts-grid {
        grid-template-columns: 1fr;
    }

    .article-title {
        font-size: var(--font-size-2xl);
    }

    .article-meta {
        flex-direction: column;
        align-items: flex-start;
        gap: var(--spacing-sm);
    }

    .blog-card-image {
        height: 180px;
    }

    .category-filter-btn {
        font-size: var(--font-size-xs);
        padding: 8px 14px;
    }
}

/* Loading State */
.blog-loading {
    text-align: center;
    padding: var(--spacing-2xl);
    color: var(--text-muted);
}

.blog-loading i {
    font-size: 48px;
    color: var(--primary-color);
    margin-bottom: var(--spacing-md);
    animation: spin 1s linear infinite;
}

@keyframes spin {
    from { transform: rotate(0deg); }
    to { transform: rotate(360deg); }
}

/* Empty State */
.blog-empty {
    text-align: center;
    padding: var(--spacing-2xl);
    color: var(--text-muted);
}

.blog-empty i {
    font-size: 64px;
    color: var(--border-color);
    margin-bottom: var(--spacing-md);
}

.blog-empty h3 {
    font-size: var(--font-size-xl);
    color: var(--text-light);
    margin-bottom: var(--spacing-sm);
}

/* Performance Optimizations */
.blog-card-image img {
    content-visibility: auto;
}

/* Reduce motion for users who prefer it */
@media (prefers-reduced-motion: reduce) {
    * {
        animation-duration: 0.01ms !important;
        animation-iteration-count: 1 !important;
        transition-duration: 0.01ms !important;
    }
}