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

/* 平板设备 (768px - 1024px) */
@media (max-width: 1024px) {
    .categories-grid {
        grid-template-columns: repeat(2, 1fr);
    }

    .products-grid {
        grid-template-columns: repeat(3, 1fr);
    }

    .news-grid {
        grid-template-columns: repeat(2, 1fr);
    }

    .footer-content {
        grid-template-columns: repeat(2, 1fr);
    }

    .values-grid {
        grid-template-columns: repeat(2, 1fr);
    }

    .products-page .products-grid {
        grid-template-columns: repeat(2, 1fr);
    }
}

/* 小平板和大手机 (640px - 768px) */
@media (max-width: 768px) {
    .header .container {
        height: 70px;
    }

    .nav-list {
        position: fixed;
        top: 70px;
        left: -100%;
        width: 100%;
        height: calc(100vh - 70px);
        background-color: #fff;
        flex-direction: column;
        align-items: center;
        justify-content: flex-start;
        padding-top: 50px;
        gap: 30px;
        transition: var(--transition);
        box-shadow: var(--shadow);
    }

    .nav-list.active {
        left: 0;
    }

    .mobile-menu-toggle {
        display: flex;
    }

    .mobile-menu-toggle.active span:nth-child(1) {
        transform: rotate(45deg) translate(5px, 5px);
    }

    .mobile-menu-toggle.active span:nth-child(2) {
        opacity: 0;
    }

    .mobile-menu-toggle.active span:nth-child(3) {
        transform: rotate(-45deg) translate(5px, -5px);
    }

    .hero-slider {
        height: 500px;
    }

    .slide-content h2 {
        font-size: 36px;
    }

    .slide-content p {
        font-size: 18px;
    }

    .about-content {
        grid-template-columns: 1fr;
        gap: 40px;
    }

    .about-image {
        order: -1;
    }

    .about-stats {
        justify-content: center;
    }

    .contact-content {
        grid-template-columns: 1fr;
        gap: 40px;
    }

    .products-grid {
        grid-template-columns: repeat(2, 1fr);
    }

    .news-grid {
        grid-template-columns: 1fr;
    }

    .footer-content {
        grid-template-columns: 1fr;
        text-align: center;
    }

    .footer-logo {
        justify-content: center;
    }

    .page-banner h1 {
        font-size: 32px;
    }

    .product-detail {
        grid-template-columns: 1fr;
        gap: 40px;
    }

    .news-item {
        grid-template-columns: 1fr;
    }

    .news-thumb {
        height: 200px;
    }

    .contact-page .contact-content {
        grid-template-columns: 1fr;
    }
}

/* 手机设备 (< 640px) */
@media (max-width: 640px) {
    .top-bar {
        display: none;
    }

    .container {
        padding: 0 15px;
    }

    .section-header h2 {
        font-size: 28px;
    }

    .hero-slider {
        height: 400px;
    }

    .slide-content h2 {
        font-size: 28px;
    }

    .slide-content p {
        font-size: 16px;
    }

    .categories-grid {
        grid-template-columns: 1fr;
    }

    .category-card {
        padding: 30px 20px;
    }

    .products-grid {
        grid-template-columns: 1fr;
    }

    .about-stats {
        flex-direction: column;
        gap: 20px;
    }

    .news-card {
        flex-direction: column;
        text-align: center;
    }

    .news-date {
        margin: 0 auto;
    }

    .contact-form-wrapper {
        padding: 25px;
    }

    .values-grid {
        grid-template-columns: 1fr;
    }

    .products-filter {
        gap: 10px;
    }

    .filter-btn {
        padding: 8px 15px;
        font-size: 14px;
    }

    .products-page .products-grid {
        grid-template-columns: 1fr;
    }

    .product-gallery {
        height: 300px;
    }

    .news-item {
        padding: 20px;
    }

    .news-thumb {
        height: 150px;
    }

    .news-detail-header h1 {
        font-size: 24px;
    }

    .map-container {
        height: 300px;
    }

    .btn {
        padding: 10px 20px;
        font-size: 14px;
    }

    .page-banner {
        height: 200px;
    }

    .page-banner h1 {
        font-size: 28px;
    }

    .page-banner p {
        font-size: 16px;
    }
}

/* 小屏幕手机 (< 375px) */
@media (max-width: 375px) {
    .logo-text h1 {
        font-size: 20px;
    }

    .slide-content h2 {
        font-size: 24px;
    }

    .section-header h2 {
        font-size: 24px;
    }

    .stat-number {
        font-size: 28px;
    }

    .footer-section h4 {
        font-size: 16px;
    }
}

/* 时间轴响应式 */
@media (max-width: 768px) {
    .timeline::before {
        left: 30px;
    }

    .timeline-item,
    .timeline-item:nth-child(even) {
        justify-content: flex-start;
        padding-left: 80px;
        padding-right: 0;
    }

    .timeline-year {
        left: 30px;
        transform: translateX(-50%);
    }

    .timeline-content,
    .timeline-item:nth-child(odd) .timeline-content,
    .timeline-item:nth-child(even) .timeline-content {
        margin-left: 0;
        margin-right: 0;
        max-width: 100%;
    }

    .honors-grid {
        grid-template-columns: repeat(2, 1fr);
    }
}

@media (max-width: 480px) {
    .honors-grid {
        grid-template-columns: 1fr;
    }
}