/* ==================== 响应式设计 ==================== */

/* 平板 */
@media (max-width: 1024px) {
    .advantage-grid,
    .product-grid {
        grid-template-columns: repeat(2, 1fr);
    }
    
    .stats-grid {
        grid-template-columns: repeat(2, 1fr);
        gap: 40px;
    }
    
    .footer-grid {
        grid-template-columns: repeat(2, 1fr);
    }
    
    .about-layout {
        grid-template-columns: 1fr;
        gap: 40px;
    }
    
    .about-experience {
        right: 20px;
        bottom: -20px;
    }
    
    .news-grid {
        grid-template-columns: 1fr;
    }
    
    .process-grid {
        grid-template-columns: repeat(3, 1fr);
    }
    
    .process-item::after {
        display: none;
    }
    
    .service-block {
        grid-template-columns: 1fr;
        gap: 40px;
    }
    
    .service-block.reverse {
        direction: ltr;
    }
    
    .contact-layout {
        grid-template-columns: 1fr;
    }
    
    .timeline::before {
        left: 30px;
    }
    
    .timeline-item,
    .timeline-item:nth-child(even) {
        padding-left: 80px;
        padding-right: 0;
        justify-content: flex-start;
    }
    
    .timeline-year {
        left: 0;
        transform: none;
        width: 60px;
        height: 60px;
        font-size: 14px;
    }
    
    .timeline-content {
        width: 100%;
    }
}

/* 手机 */
@media (max-width: 768px) {
    .top-bar .container {
        flex-direction: column;
        gap: 10px;
        text-align: center;
    }
    
    .nav {
        display: none;
        position: absolute;
        top: 80px;
        left: 0;
        width: 100%;
        background: var(--white);
        box-shadow: var(--shadow);
        padding: 20px;
    }
    
    .nav.active {
        display: block;
    }
    
    .nav ul {
        flex-direction: column;
        gap: 15px;
    }
    
    .mobile-menu-btn {
        display: flex;
    }
    
    .banner {
        height: 500px;
    }
    
    .banner-content h1 {
        font-size: 32px;
    }
    
    .banner-content p {
        font-size: 16px;
    }
    
    .banner-btns {
        flex-direction: column;
        align-items: center;
    }
    
    .section {
        padding: 60px 0;
    }
    
    .section-title {
        font-size: 28px;
    }
    
    .advantage-grid,
    .product-grid,
    .culture-grid,
    .honor-grid,
    .case-grid {
        grid-template-columns: 1fr;
    }
    
    .stats-grid {
        grid-template-columns: 1fr 1fr;
        gap: 30px;
    }
    
    .stat-number {
        font-size: 36px;
    }
    
    .footer-grid {
        grid-template-columns: 1fr;
        gap: 40px;
    }
    
    .cta-btns {
        flex-direction: column;
        gap: 20px;
    }
    
    .cta-phone {
        font-size: 24px;
    }
    
    .process-grid {
        grid-template-columns: repeat(2, 1fr);
    }
    
    .news-item-large {
        grid-template-columns: 1fr;
    }
    
    .news-item-large .news-image {
        height: 200px;
    }
    
    .contact-form .form-row {
        grid-template-columns: 1fr;
    }
    
    .page-header h1 {
        font-size: 32px;
    }
    
    .about-highlights {
        flex-wrap: wrap;
        gap: 20px;
    }
    
    .banner-arrows {
        display: none;
    }
}

/* 小屏手机 */
@media (max-width: 480px) {
    .banner-content h1 {
        font-size: 28px;
    }
    
    .stats-grid {
        grid-template-columns: 1fr;
    }
    
    .process-grid {
        grid-template-columns: 1fr;
    }
    
    .form-card {
        padding: 25px;
    }
}