/* 相關消息樣式 */
.related-articles {
    margin-top: 40px;
    padding-top: 30px;
    border-top: 1px solid #e9ecef;
}

.related-articles h3 {
    margin: 0 0 25px 0;
    color: #333;
    font-size: 24px;
    font-weight: 600;
    text-align: center;
    position: relative;
}

.related-articles h3::after {
    content: '';
    position: absolute;
    bottom: -10px;
    left: 50%;
    transform: translateX(-50%);
    width: 60px;
    height: 3px;
    background: linear-gradient(135deg, #667eea 0%, #764ba2 100%);
    border-radius: 2px;
}

.related-articles-grid {
    display: grid;
    grid-template-columns: repeat(auto-fit, minmax(300px, 1fr));
    gap: 25px;
    margin-top: 30px;
}

.related-article-item {
    background: white;
    border-radius: 12px;
    overflow: hidden;
    box-shadow: 0 4px 12px rgba(0, 0, 0, 0.1);
    transition: all 0.3s ease;
    text-decoration: none;
    color: inherit;
}

.related-article-item:hover {
    transform: translateY(-5px);
    box-shadow: 0 8px 25px rgba(0, 0, 0, 0.15);
    text-decoration: none;
    color: inherit;
}

.related-article-image {
    position: relative;
    width: 100%;
    height: 200px;
    overflow: hidden;
}

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

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

.related-article-content {
    padding: 20px;
}

.related-article-content h4 {
    margin: 0 0 12px 0;
    color: #333;
    font-size: 18px;
    font-weight: 600;
    line-height: 1.4;
    display: -webkit-box;
    -webkit-line-clamp: 2;
    -webkit-box-orient: vertical;
    overflow: hidden;
}

.related-article-content p {
    margin: 0 0 15px 0;
    color: #666;
    font-size: 14px;
    line-height: 1.6;
    display: -webkit-box;
    -webkit-line-clamp: 3;
    -webkit-box-orient: vertical;
    overflow: hidden;
}

.related-article-date {
    color: #999;
    font-size: 12px;
    font-weight: 500;
    text-transform: uppercase;
    letter-spacing: 0.5px;
}

/* 響應式設計 */
@media (max-width: 768px) {
    .related-articles-grid {
        grid-template-columns: 1fr;
        gap: 20px;
    }
    
    .related-articles h3 {
        font-size: 20px;
    }
    
    .related-article-image {
        height: 180px;
    }
    
    .related-article-content {
        padding: 15px;
    }
    
    .related-article-content h4 {
        font-size: 16px;
    }
}

@media (max-width: 480px) {
    .related-articles {
        margin-top: 30px;
        padding-top: 20px;
    }
    
    .related-articles h3 {
        font-size: 18px;
        margin-bottom: 20px;
    }
    
    .related-article-image {
        height: 160px;
    }
    
    .related-article-content {
        padding: 12px;
    }
    
    .related-article-content h4 {
        font-size: 15px;
    }
    
    .related-article-content p {
        font-size: 13px;
    }
}

/* 載入狀態 */
.related-articles.loading {
    opacity: 0.6;
    pointer-events: none;
}

.related-articles.loading::after {
    content: '';
    position: absolute;
    top: 50%;
    left: 50%;
    transform: translate(-50%, -50%);
    width: 40px;
    height: 40px;
    border: 3px solid #f3f3f3;
    border-top: 3px solid #667eea;
    border-radius: 50%;
    animation: spin 1s linear infinite;
}

@keyframes spin {
    0% { transform: translate(-50%, -50%) rotate(0deg); }
    100% { transform: translate(-50%, -50%) rotate(360deg); }
}

/* 無相關消息狀態 */
.related-articles.no-related {
    text-align: center;
    padding: 40px 20px;
    color: #666;
}

.related-articles.no-related h3 {
    margin-bottom: 15px;
    color: #999;
}

.related-articles.no-related p {
    margin: 0;
    font-size: 14px;
    line-height: 1.6;
}