/* 平板电脑和小屏幕电脑 (768px - 1024px) */
@media screen and (max-width: 1024px) {
    .container {
        padding: 0 20px;
    }

    /* 导航栏 */
    .nav-menu ul {
        gap: 20px;
    }

    /* 产品网格 */
    .product-grid {
        grid-template-columns: repeat(2, 1fr);
    }

    /* 联系页面 */
    .contact-grid {
        grid-template-columns: 1fr;
        gap: 40px;
    }
}

/* 手机和平板 (小于 768px) */
@media screen and (max-width: 768px) {
    /* 顶部信息栏 */
    .top-bar .container {
        flex-direction: column;
        gap: 5px;
    }

    /* 导航栏 */
    .header .container {
        height: auto;
        padding: 15px 20px;
    }

    .mobile-menu-btn {
        display: block;
    }

    .nav-menu {
        display: none;
        position: absolute;
        top: 100%;
        left: 0;
        right: 0;
        background: #fff;
        padding: 20px;
        box-shadow: 0 2px 10px rgba(0,0,0,0.1);
    }

    .nav-menu.active {
        display: block;
    }

    .nav-menu ul {
        flex-direction: column;
        gap: 15px;
    }

    /* 页面标题区 */
    .page-banner {
        padding: 40px 0;
    }

    .page-banner h1 {
        font-size: 2rem;
    }

    /* 产品筛选 */
    .filter-options {
        flex-direction: column;
    }

    .filter-group {
        width: 100%;
    }

    .filter-group select {
        width: 100%;
    }

    /* 产品网格 */
    .product-grid {
        grid-template-columns: 1fr;
    }

    /* 产品详情页 */
    .product-main {
        flex-direction: column;
    }

    .product-gallery {
        width: 100%;
        margin-bottom: 30px;
    }

    /* 新闻列表 */
    .news-item {
        flex-direction: column;
    }

    .news-image {
        width: 100%;
        margin-bottom: 20px;
    }

    /* 关于页面 */
    .intro-content {
        flex-direction: column;
    }

    .intro-image {
        width: 100%;
        margin-top: 30px;
    }

    .timeline::before {
        left: 20px;
    }

    .timeline-item {
        padding-left: 50px;
    }

    .timeline-item::before {
        left: 11px;
    }

    /* 联系页面 */
    .info-list {
        grid-template-columns: 1fr;
    }

    .contact-form {
        padding: 20px;
    }

    .category-grid,
    .about-content,
    .stats-grid {
        grid-template-columns: 1fr;
    }
    
    .news-grid {
        grid-template-columns: 1fr;
    }
    
    .news-item.featured {
        grid-column: auto;
        grid-row: auto;
    }
    
    .about-image {
        order: -1;
    }
    
    .experience-badge {
        right: 50%;
        transform: translateX(50%);
    }
}

/* 小手机 (小于 480px) */
@media screen and (max-width: 480px) {
    /* 页面标题区 */
    .page-banner h1 {
        font-size: 1.8rem;
    }

    /* 按钮 */
    .btn {
        padding: 10px 20px;
    }

    /* 页脚 */
    .footer-content {
        grid-template-columns: 1fr;
    }

    .social-links {
        justify-content: center;
    }
}