/* ============================================
   GlobalTrade Pro - Responsive Styles
   响应式样式文件
   ============================================ */

/* 平板设备 (1024px及以下) */
@media screen and (max-width: 1024px) {
    :root {
        --section-padding: 60px;
    }
    
    .container {
        padding: 0 15px;
    }
    
    .header-content {
        height: 70px;
    }
    
    .main-nav ul {
        gap: 25px;
    }
    
    .hero-banner,
    .hero-slide {
        height: 500px;
    }
    
    .hero-content h2 {
        font-size: 36px;
    }
    
    .features-grid,
    .products-grid,
    .applications-grid {
        grid-template-columns: repeat(2, 1fr);
    }
    
    .stats-grid {
        grid-template-columns: repeat(2, 1fr);
    }
    
    .about-content {
        grid-template-columns: 1fr;
        gap: 40px;
    }
    
    .about-images {
        order: -1;
    }
    
    .contact-wrapper {
        grid-template-columns: 1fr;
        gap: 40px;
    }
    
    .footer-grid {
        grid-template-columns: repeat(2, 1fr);
    }
}

/* 小平板/大手机 (768px及以下) */
@media screen and (max-width: 768px) {
    .top-bar-info {
        display: none;
    }
    
    .mobile-menu-toggle {
        display: flex;
    }
    
    .main-nav {
        position: fixed;
        top: 70px;
        left: -100%;
        width: 100%;
        height: calc(100vh - 70px);
        background: var(--white);
        transition: var(--transition);
        overflow-y: auto;
    }
    
    .main-nav.active {
        left: 0;
    }
    
    .main-nav ul {
        flex-direction: column;
        gap: 0;
        padding: 20px;
    }
    
    .main-nav a {
        padding: 15px 0;
        border-bottom: 1px solid var(--border-color);
        display: block;
    }
    
    .main-nav a::after {
        display: none;
    }
    
    .main-nav ul ul {
        position: static;
        opacity: 1;
        visibility: visible;
        transform: none;
        box-shadow: none;
        padding: 0 0 0 20px;
        display: none;
    }
    
    .main-nav li.active > ul {
        display: flex;
    }
    
    .hero-banner,
    .hero-slide {
        height: 450px;
    }
    
    .hero-content h2 {
        font-size: 28px;
    }
    
    .hero-content p {
        font-size: 16px;
    }
    
    .hero-buttons {
        flex-direction: column;
        gap: 15px;
    }
    
    .section-header h2 {
        font-size: 28px;
    }
    
    .features-grid {
        grid-template-columns: 1fr;
    }
    
    .products-grid {
        grid-template-columns: repeat(2, 1fr);
        gap: 20px;
    }
    
    .product-image {
        height: 200px;
    }
    
    .stats-grid {
        grid-template-columns: repeat(2, 1fr);
        gap: 20px;
    }
    
    .stat-number {
        font-size: 36px;
    }
    
    .applications-grid {
        grid-template-columns: repeat(2, 1fr);
    }
    
    .about-features {
        grid-template-columns: 1fr;
    }
    
    .about-experience {
        position: relative;
        bottom: 0;
        right: 0;
        margin-top: 20px;
    }
    
    .form-row {
        grid-template-columns: 1fr;
    }
    
    .cta-section h2 {
        font-size: 28px;
    }
    
    .cta-buttons {
        flex-direction: column;
        align-items: center;
    }
    
    .footer-grid {
        grid-template-columns: 1fr;
        gap: 30px;
    }
    
    .footer-bottom {
        flex-direction: column;
        text-align: center;
        gap: 15px;
    }
}

/* 手机设备 (480px及以下) */
@media screen and (max-width: 480px) {
    :root {
        --section-padding: 40px;
    }
    
    .hero-banner,
    .hero-slide {
        height: 400px;
    }
    
    .hero-content h2 {
        font-size: 24px;
    }
    
    .hero-content p {
        font-size: 14px;
    }
    
    .btn {
        padding: 12px 24px;
        font-size: 13px;
    }
    
    .section-header h2 {
        font-size: 24px;
    }
    
    .section-header p {
        font-size: 14px;
    }
    
    .product-filter {
        gap: 10px;
    }
    
    .filter-btn {
        padding: 8px 16px;
        font-size: 13px;
    }
    
    .products-grid {
        grid-template-columns: 1fr;
    }
    
    .stats-grid,
    .applications-grid {
        grid-template-columns: 1fr;
    }
    
    .about-text h3 {
        font-size: 24px;
    }
    
    .contact-form-wrapper {
        padding: 25px;
    }
    
    .cta-section h2 {
        font-size: 24px;
    }
    
    .cta-section p {
        font-size: 14px;
    }
}

/* 针对特定设备的优化 */
@media screen and (max-width: 360px) {
    .hero-content h2 {
        font-size: 20px;
    }
    
    .feature-icon {
        width: 60px;
        height: 60px;
        font-size: 24px;
    }
    
    .feature-item h3 {
        font-size: 16px;
    }
}

/* 触摸设备优化 */
@media (hover: none) {
    .product-overlay {
        opacity: 1;
        background: linear-gradient(to top, rgba(26, 95, 122, 0.9) 0%, transparent 100%);
        align-items: flex-end;
        padding-bottom: 20px;
    }
    
    .product-overlay a {
        background: var(--white);
        color: var(--primary-color);
    }
}

/* 打印样式 */
@media print {
    .top-bar,
    .main-header,
    .hero-banner,
    .site-footer,
    .cta-section,
    .mobile-menu-toggle {
        display: none;
    }
    
    body {
        font-size: 12pt;
        color: #000;
    }
    
    a {
        text-decoration: underline;
        color: #000;
    }
    
    .container {
        max-width: 100%;
    }
}