/* ===== 响应式样式 ===== */

/* 平板 */
@media (max-width: 1024px) {
    .grid-container {
        grid-template-columns: repeat(2, 1fr);
    }
    
    .theory-grid {
        grid-template-columns: repeat(2, 1fr);
    }
    
    .hero-title {
        font-size: 36px;
    }
    
    .hero-subtitle {
        font-size: 18px;
    }
}

/* 手机 */
@media (max-width: 768px) {
    .nav-links {
        position: fixed;
        top: 64px;
        left: 0;
        right: 0;
        background: rgba(255,255,255,0.98);
        backdrop-filter: blur(20px);
        flex-direction: column;
        padding: 16px;
        gap: 4px;
        transform: translateY(-100%);
        opacity: 0;
        pointer-events: none;
        transition: var(--transition);
        z-index: 999;
    }
    
    .nav-links.open {
        transform: translateY(0);
        opacity: 1;
        pointer-events: all;
    }
    
    .nav-toggle {
        display: flex;
    }
    
    .nav-toggle.open span:nth-child(1) {
        transform: rotate(45deg) translate(5px, 5px);
    }
    
    .nav-toggle.open span:nth-child(2) {
        opacity: 0;
    }
    
    .nav-toggle.open span:nth-child(3) {
        transform: rotate(-45deg) translate(5px, -5px);
    }
    
    .hero {
        min-height: 400px;
    }
    
    .hero-title {
        font-size: 28px;
    }
    
    .hero-subtitle {
        font-size: 16px;
    }
    
    .hero-desc {
        font-size: 14px;
    }
    
    .hero-stats {
        gap: 24px;
    }
    
    .stat-num {
        font-size: 22px;
    }
    
    .grid-container {
        grid-template-columns: 1fr;
    }
    
    .article-list {
        grid-template-columns: 1fr;
    }
    
    .theory-grid {
        grid-template-columns: 1fr;
    }
    
    .dimension-grid {
        grid-template-columns: 1fr;
    }
    
    .category-header {
        padding: 24px;
    }
    
    .article-detail .detail-title {
        font-size: 24px;
    }
    
    .about-title {
        font-size: 28px;
    }
    
    .footer-container {
        flex-direction: column;
        text-align: center;
    }
    
    .footer-links {
        flex-wrap: wrap;
        justify-content: center;
    }
    
    .footer-info {
        text-align: center;
    }
    
    .filter-bar {
        flex-direction: column;
    }
    
    .section-title {
        font-size: 20px;
    }
    
    .insight-quote {
        font-size: 18px;
    }
}

/* 小手机 */
@media (max-width: 480px) {
    .hero-content {
        padding: 80px 16px 40px;
    }
    
    .hero-title {
        font-size: 24px;
    }
    
    .hero-stats {
        flex-direction: column;
        gap: 16px;
    }
    
    .category-card {
        padding: 20px;
    }
    
    .insight-card {
        padding: 24px;
    }
}