/* ========================================
   Responsive CSS - 响应式断点样式
   ======================================== */

/* === Large Desktop (1200-1400px) === */
@media (max-width: 1200px) {
    .product-grid {
        grid-template-columns: repeat(3, 1fr);
    }
    .news-grid {
        gap: 20px;
    }
}

/* === Tablet Landscape (992-1199px) === */
@media (max-width: 1024px) {
    .about-content {
        grid-template-columns: 1fr;
        gap: 40px;
    }
    .about-image::before {
        display: none;
    }
    .about-image img {
        height: 400px;
    }
    .product-grid {
        grid-template-columns: repeat(2, 1fr);
        gap: 16px;
    }
    .case-grid {
        grid-template-columns: repeat(2, 1fr);
    }
    .news-grid {
        grid-template-columns: repeat(2, 1fr);
    }
    .contact-grid {
        grid-template-columns: 1fr;
    }
    .product-detail-grid {
        grid-template-columns: 1fr;
    }
    .hero-content h1 {
        font-size: 4rem;
    }
    .footer-grid {
        grid-template-columns: 1fr 1fr;
        gap: 30px;
    }
}

/* === Tablet Portrait (768-991px) === */
@media (max-width: 768px) {
    /* Navigation */
    .nav-menu {
        position: fixed;
        top: 0;
        right: -100%;
        width: 280px;
        height: 100vh;
        background: var(--color-white);
        flex-direction: column;
        padding: 80px 40px 40px;
        gap: 0;
        transition: right 0.3s ease;
        box-shadow: var(--shadow-lg);
    }
    .nav-menu.active {
        right: 0;
    }
    .nav-menu li {
        border-bottom: 1px solid var(--color-border);
    }
    .nav-menu li a {
        display: block;
        padding: 16px 0;
        color: var(--color-text) !important;
        font-size: 1.6rem;
    }
    .nav-menu li a::after {
        display: none;
    }
    .mobile-toggle {
        display: flex;
        z-index: 1001;
    }

    /* Hero */
    .hero {
        min-height: 500px;
        height: 70vh;
    }
    .hero-content h1 {
        font-size: 3.2rem;
        letter-spacing: 6px;
    }
    .hero-content .hero-subtitle {
        font-size: 1.4rem;
        letter-spacing: 3px;
    }
    .hero-arrow {
        display: none;
    }


    /* Sections */
    .about-section,
    .products-section,
    .cases-section,
    .news-section,
    .contact-section {
        padding: 60px 0;
    }

    .about-stats {
        grid-template-columns: repeat(3, 1fr);
        gap: 12px;
    }
    .about-stats .stat-number {
        font-size: 2.4rem;
    }

    .product-grid {
        grid-template-columns: repeat(2, 1fr);
        gap: 12px;
    }

    .case-grid {
        grid-template-columns: 1fr 1fr;
        gap: 8px;
    }
    .case-item {
        aspect-ratio: 3/2;
    }

    .news-grid {
        grid-template-columns: 1fr;
        gap: 16px;
    }

    .footer-grid {
        grid-template-columns: 1fr;
        gap: 30px;
    }

    /* Product Detail */
    .product-detail-grid {
        gap: 30px;
    }

    /* Page Banner */
    .page-banner {
        height: 280px;
    }
    .page-banner .banner-content h1 {
        font-size: 2.8rem;
    }

    .back-to-top {
        bottom: 20px;
        right: 20px;
        width: 38px;
        height: 38px;
    }
}

/* === Mobile (480-767px) === */
@media (max-width: 480px) {
    .product-grid {
        grid-template-columns: 1fr 1fr;
        gap: 8px;
    }

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

    .hero-content h1 {
        font-size: 2.6rem;
        letter-spacing: 4px;
    }

    .hero-content .hero-subtitle {
        font-size: 1.2rem;
        letter-spacing: 2px;
    }

    .hero-content .hero-buttons {
        flex-direction: column;
        align-items: center;
    }

    .section-title .cn-title {
        font-size: 2.4rem;
    }

    .about-stats {
        grid-template-columns: repeat(3, 1fr);
        gap: 8px;
    }
    .about-stats .stat-item {
        padding: 16px 8px;
    }
    .about-stats .stat-number {
        font-size: 2rem;
    }
    .about-stats .stat-label {
        font-size: 1.1rem;
    }

    .product-card .card-info {
        padding: 12px;
    }
    .product-card .card-info h4 {
        font-size: 1.4rem;
    }

    .page-banner {
        height: 220px;
    }
    .page-banner .banner-content h1 {
        font-size: 2.4rem;
        letter-spacing: 2px;
    }
}