/**
 * Related Content Styles
 * 
 * Styles for related articles, author articles, and trending content sections
 * Requirements: 9.1, 9.3, 9.4
 */

/* Related Content Wrapper */
.related-content-wrapper {
    background: var(--color-background-secondary, #f8f9fa);
    padding: 60px 0;
    margin-top: 60px;
}

/* Section Spacing */
.section--related-articles {
    padding-bottom: 40px;
}

.section--sidebar-content {
    padding-top: 0;
}

/* Sidebar Content Grid */
.sidebar-content-grid {
    display: grid;
    grid-template-columns: 1fr 1fr;
    gap: 40px;
}

@media (max-width: 768px) {
    .sidebar-content-grid {
        grid-template-columns: 1fr;
        gap: 30px;
    }
}

/* Sidebar Section */
.sidebar-section {
    background: white;
    border-radius: 12px;
    padding: 24px;
    box-shadow: 0 2px 8px rgba(0, 0, 0, 0.05);
}

.sidebar-section__title {
    font-size: 20px;
    font-weight: 700;
    margin: 0 0 20px 0;
    color: var(--color-text-primary, #1a1a1a);
    padding-bottom: 12px;
    border-bottom: 2px solid var(--color-primary, #3b82f6);
}

/* Article List - Compact */
.article-list--compact {
    display: flex;
    flex-direction: column;
    gap: 16px;
}

/* Article Card - Compact */
.article-card--compact {
    display: flex;
    gap: 12px;
    padding: 12px;
    border-radius: 8px;
    transition: background-color 0.2s ease;
}

.article-card--compact:hover {
    background-color: var(--color-background-hover, #f1f5f9);
}

.article-card__image {
    flex-shrink: 0;
    width: 120px;
    height: 80px;
    border-radius: 6px;
    overflow: hidden;
    display: block;
}

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

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

.article-card__content {
    flex: 1;
    min-width: 0;
    display: flex;
    flex-direction: column;
    gap: 6px;
}

.article-card__category {
    font-size: 12px;
    font-weight: 600;
    text-transform: uppercase;
    letter-spacing: 0.5px;
    text-decoration: none;
    display: inline-block;
    transition: opacity 0.2s ease;
}

.article-card__category:hover {
    opacity: 0.8;
}

.article-card__title {
    font-size: 15px;
    font-weight: 600;
    line-height: 1.4;
    margin: 0;
    color: var(--color-text-primary, #1a1a1a);
}

.article-card__title a {
    color: inherit;
    text-decoration: none;
    transition: color 0.2s ease;
}

.article-card__title a:hover {
    color: var(--color-primary, #3b82f6);
}

.article-card__meta {
    display: flex;
    align-items: center;
    gap: 12px;
    font-size: 13px;
    color: var(--color-text-secondary, #6b7280);
}

.article-card__date,
.article-card__reading-time,
.article-card__views,
.article-card__likes {
    display: flex;
    align-items: center;
    gap: 4px;
}

/* Mobile Optimizations */
@media (max-width: 768px) {
    .related-content-wrapper {
        padding: 40px 0;
        margin-top: 40px;
    }
    
    .sidebar-section {
        padding: 20px;
    }
    
    .sidebar-section__title {
        font-size: 18px;
        margin-bottom: 16px;
    }
    
    .article-card--compact {
        padding: 8px;
    }
    
    .article-card__image {
        width: 100px;
        height: 67px;
    }
    
    .article-card__title {
        font-size: 14px;
    }
    
    .article-card__meta {
        font-size: 12px;
        gap: 8px;
    }
}

/* Grid Adjustments for Related Articles */
.section--related-articles .grid--3 {
    grid-template-columns: repeat(3, 1fr);
    gap: 24px;
}

@media (max-width: 1024px) {
    .section--related-articles .grid--3 {
        grid-template-columns: repeat(2, 1fr);
    }
}

@media (max-width: 640px) {
    .section--related-articles .grid--3 {
        grid-template-columns: 1fr;
    }
}

/* Empty State */
.related-content-empty {
    text-align: center;
    padding: 40px 20px;
    color: var(--color-text-secondary, #6b7280);
}

.related-content-empty__icon {
    font-size: 48px;
    margin-bottom: 16px;
    opacity: 0.5;
}

.related-content-empty__text {
    font-size: 16px;
}

/* Loading State */
.related-content-loading {
    display: flex;
    justify-content: center;
    align-items: center;
    padding: 40px;
}

.related-content-loading__spinner {
    width: 40px;
    height: 40px;
    border: 3px solid var(--color-border, #e5e7eb);
    border-top-color: var(--color-primary, #3b82f6);
    border-radius: 50%;
    animation: spin 0.8s linear infinite;
}

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

/* Accessibility */
.article-card--compact:focus-within {
    outline: 2px solid var(--color-primary, #3b82f6);
    outline-offset: 2px;
}

/* Print Styles */
@media print {
    .related-content-wrapper {
        display: none;
    }
}