/* Blog Page Styles - AEO/GEO Optimized */
/* Uses theme variables from main CSS, with fallbacks */

:root {
    --blog-primary: var(--primary, #22c55e);
    --blog-primary-dark: var(--primary-dark, #16a34a);
    --blog-bg: var(--bg-primary, #ffffff);
    --blog-surface: var(--bg-secondary, #f8fafc);
    --blog-surface-elevated: var(--bg-tertiary, #f1f5f9);
    --blog-text: var(--text-primary, #1e293b);
    --blog-text-muted: var(--text-secondary, #64748b);
    --blog-border: var(--border, #e2e8f0);
    --blog-accent: var(--accent, #f59e0b);
}

[data-theme="dark"] {
    --blog-bg: var(--bg-primary, #0f172a);
    --blog-surface: var(--bg-secondary, #1e293b);
    --blog-surface-elevated: var(--bg-tertiary, #334155);
    --blog-text: var(--text-primary, #f1f5f9);
    --blog-text-muted: var(--text-secondary, #94a3b8);
    --blog-border: var(--border, #334155);
}

/* Blog Hero */
.blog-hero {
    background: linear-gradient(135deg, var(--blog-bg) 0%, #1a1a2e 100%);
    padding: 6rem 1.5rem 4rem;
    text-align: center;
    border-bottom: 1px solid var(--blog-border);
}

.blog-title {
    font-size: clamp(2.5rem, 6vw, 4rem);
    font-weight: 800;
    color: #fff;
    margin-bottom: 1rem;
    letter-spacing: -0.02em;
}

.lead-text {
    font-size: 1.25rem;
    color: var(--blog-text-muted);
    max-width: 640px;
    margin: 0 auto;
    line-height: 1.7;
}

/* Category Filter */
.category-filter {
    background: var(--blog-surface);
    padding: 1.5rem;
    border-bottom: 1px solid var(--blog-border);
    position: sticky;
    top: 60px;
    z-index: 100;
}

.filter-buttons {
    display: flex;
    gap: 0.75rem;
    overflow-x: auto;
    padding-bottom: 0.5rem;
    scrollbar-width: thin;
}

.filter-btn {
    background: transparent;
    border: 1px solid var(--blog-border);
    color: var(--blog-text-muted);
    padding: 0.5rem 1.25rem;
    border-radius: 100px;
    font-size: 0.875rem;
    font-weight: 500;
    cursor: pointer;
    white-space: nowrap;
    transition: all 0.2s ease;
}

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

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

/* Articles Section */
.articles-section {
    background: var(--blog-bg);
    padding: 3rem 1.5rem;
    min-height: 60vh;
}

.articles-grid {
    display: grid;
    grid-template-columns: repeat(auto-fill, minmax(320px, 1fr));
    gap: 2rem;
    margin-bottom: 3rem;
}

/* Article Card */
.article-card {
    background: var(--blog-surface);
    border-radius: 16px;
    overflow: hidden;
    border: 1px solid var(--blog-border);
    transition: transform 0.3s ease, box-shadow 0.3s ease;
}

.article-card:hover {
    transform: translateY(-4px);
    box-shadow: 0 20px 40px rgba(0, 0, 0, 0.4);
}

.article-link {
    text-decoration: none;
    color: inherit;
    display: block;
}

.article-image {
    aspect-ratio: 16 / 9;
    overflow: hidden;
    background: var(--blog-surface-elevated);
}

.article-image img {
    width: 100%;
    height: 100%;
    object-fit: cover;
    transition: transform 0.3s ease;
}

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

.article-content {
    padding: 1.5rem;
}

.article-meta {
    display: flex;
    align-items: center;
    gap: 1rem;
    margin-bottom: 0.75rem;
    font-size: 0.8125rem;
}

.article-category {
    color: var(--blog-primary);
    font-weight: 600;
    text-transform: uppercase;
    letter-spacing: 0.05em;
}

.article-read-time {
    color: var(--blog-text-muted);
    display: flex;
    align-items: center;
    gap: 0.375rem;
}

.article-title {
    font-size: 1.25rem;
    font-weight: 700;
    color: #fff;
    margin-bottom: 0.75rem;
    line-height: 1.4;
    display: -webkit-box;
    -webkit-line-clamp: 2;
    -webkit-box-orient: vertical;
    overflow: hidden;
}

.article-excerpt {
    color: var(--blog-text-muted);
    font-size: 0.9375rem;
    line-height: 1.6;
    display: -webkit-box;
    -webkit-line-clamp: 3;
    -webkit-box-orient: vertical;
    overflow: hidden;
    margin-bottom: 1.25rem;
}

.article-footer {
    display: flex;
    justify-content: space-between;
    align-items: center;
    padding-top: 1rem;
    border-top: 1px solid var(--blog-border);
}

.article-author {
    display: flex;
    align-items: center;
    gap: 0.5rem;
}

.author-name {
    font-size: 0.875rem;
    font-weight: 500;
    color: var(--blog-text);
}

.article-date {
    font-size: 0.8125rem;
    color: var(--blog-text-muted);
}

/* Loading State */
.loading-state {
    display: flex;
    justify-content: center;
    padding: 3rem;
}

.spinner {
    width: 40px;
    height: 40px;
    border: 3px solid var(--blog-border);
    border-top-color: var(--blog-primary);
    border-radius: 50%;
    animation: spin 1s linear infinite;
}

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

.loading-state[hidden], 
.empty-state[hidden] {
    display: none;
}

.empty-state {
    text-align: center;
    padding: 4rem 2rem;
    color: var(--blog-text-muted);
}

/* Pagination */
.pagination {
    display: flex;
    justify-content: center;
    align-items: center;
    gap: 1.5rem;
    padding-top: 2rem;
    border-top: 1px solid var(--blog-border);
}

.page-btn {
    background: var(--blog-surface);
    border: 1px solid var(--blog-border);
    color: var(--blog-text);
    padding: 0.75rem 1.5rem;
    border-radius: 8px;
    font-weight: 500;
    cursor: pointer;
    transition: all 0.2s ease;
}

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

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

.page-info {
    color: var(--blog-text-muted);
    font-size: 0.875rem;
}

/* Newsletter CTA */
.newsletter-cta {
    background: linear-gradient(135deg, var(--blog-primary) 0%, var(--blog-primary-dark) 100%);
    padding: 4rem 1.5rem;
    text-align: center;
}

.newsletter-cta h2 {
    font-size: 2rem;
    color: #fff;
    margin-bottom: 0.75rem;
}

.newsletter-cta p {
    color: rgba(255, 255, 255, 0.9);
    margin-bottom: 1.5rem;
}

.cta-button {
    display: inline-block;
    background: #fff;
    color: var(--blog-primary-dark);
    padding: 0.875rem 2rem;
    border-radius: 8px;
    font-weight: 600;
    text-decoration: none;
    transition: transform 0.2s ease, box-shadow 0.2s ease;
}

.cta-button:hover {
    transform: translateY(-2px);
    box-shadow: 0 10px 20px rgba(0, 0, 0, 0.2);
}

/* Container */
.container {
    max-width: 1200px;
    margin: 0 auto;
    padding: 0 1rem;
}

/* Accessibility */
.visually-hidden {
    position: absolute;
    width: 1px;
    height: 1px;
    padding: 0;
    margin: -1px;
    overflow: hidden;
    clip: rect(0, 0, 0, 0);
    white-space: nowrap;
    border: 0;
}

/* Responsive */
@media (max-width: 768px) {
    .blog-hero {
        padding: 4rem 1rem 3rem;
    }
    
    .articles-grid {
        grid-template-columns: 1fr;
    }
    
    .filter-buttons {
        justify-content: flex-start;
    }
}

/* ============================================
   Homepage Blog Section
   ============================================ */

.blog-section {
    padding: 6rem 0;
    background: var(--blog-bg);
}

.blog-grid {
    display: grid;
    grid-template-columns: repeat(3, 1fr);
    gap: 2rem;
    margin-top: 3rem;
}

.blog-card {
    background: var(--blog-surface);
    border-radius: 1rem;
    overflow: hidden;
    border: 1px solid var(--blog-border);
    transition: transform 0.3s ease, box-shadow 0.3s ease;
}

.blog-card:hover {
    transform: translateY(-4px);
    box-shadow: 0 20px 40px rgba(0, 0, 0, 0.1);
}

[data-theme="dark"] .blog-card:hover {
    box-shadow: 0 20px 40px rgba(0, 0, 0, 0.3);
}

.blog-card-image {
    position: relative;
    aspect-ratio: 16 / 10;
    overflow: hidden;
    background: var(--blog-surface-elevated);
}

.blog-card-image img {
    width: 100%;
    height: 100%;
    object-fit: cover;
    transition: transform 0.4s ease;
}

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

.blog-category {
    position: absolute;
    top: 1rem;
    left: 1rem;
    background: var(--blog-primary);
    color: #fff;
    padding: 0.35rem 0.75rem;
    border-radius: 0.5rem;
    font-size: 0.75rem;
    font-weight: 600;
    text-transform: uppercase;
    letter-spacing: 0.05em;
}

.blog-card-content {
    padding: 1.5rem;
}

.blog-meta {
    display: flex;
    align-items: center;
    gap: 1rem;
    margin-bottom: 0.75rem;
    font-size: 0.85rem;
    color: var(--blog-text-muted);
}

.blog-read-time::before {
    content: "•";
    margin-right: 1rem;
}

.blog-card-title {
    font-size: 1.15rem;
    font-weight: 700;
    color: var(--blog-text);
    margin-bottom: 0.75rem;
    line-height: 1.4;
    display: -webkit-box;
    -webkit-line-clamp: 2;
    -webkit-box-orient: vertical;
    overflow: hidden;
}

.blog-card-excerpt {
    font-size: 0.95rem;
    color: var(--blog-text-muted);
    line-height: 1.6;
    margin-bottom: 1.25rem;
    display: -webkit-box;
    -webkit-line-clamp: 3;
    -webkit-box-orient: vertical;
    overflow: hidden;
}

.blog-read-more {
    display: inline-flex;
    align-items: center;
    gap: 0.5rem;
    color: var(--blog-primary);
    font-weight: 600;
    font-size: 0.9rem;
    text-decoration: none;
    transition: gap 0.2s ease;
}

.blog-read-more:hover {
    gap: 0.75rem;
}

.blog-read-more svg {
    transition: transform 0.2s ease;
}

.blog-read-more:hover svg {
    transform: translateX(2px);
}

.blog-cta {
    text-align: center;
    margin-top: 3rem;
}

.blog-cta .btn-outline {
    display: inline-flex;
    align-items: center;
    gap: 0.5rem;
    border: 2px solid var(--blog-primary);
    color: var(--blog-primary);
    background: transparent;
    padding: 0.875rem 2rem;
    border-radius: 0.75rem;
    font-weight: 600;
    transition: all 0.3s ease;
}

.blog-cta .btn-outline:hover {
    background: var(--blog-primary);
    color: #fff;
}

/* Blog Section Responsive */
@media (max-width: 1024px) {
    .blog-grid {
        grid-template-columns: repeat(2, 1fr);
    }
}

@media (max-width: 640px) {
    .blog-section {
        padding: 4rem 0;
    }
    
    .blog-grid {
        grid-template-columns: 1fr;
        gap: 1.5rem;
    }
    
    .blog-card-title {
        font-size: 1.1rem;
    }
}