/* 响应式设计断点 */
@media (max-width: 1200px) {
    :root {
        --container-width: 1140px;
    }
    
    .hero-section h1 {
        font-size: 3rem;
    }
    
    .section-header h2 {
        font-size: 2.2rem;
    }
    
    .advantage-item {
        padding: var(--spacing-lg);
    }
}

@media (max-width: 992px) {
    :root {
        --container-width: 960px;
    }
    
    .hero-section h1 {
        font-size: 2.5rem;
    }
    
    .hero-section .subtitle {
        font-size: 1.2rem;
    }
    
    .section-header h2 {
        font-size: 2rem;
    }
    
    .advantages-grid {
        grid-template-columns: repeat(2, 1fr);
    }
    
    .products-grid {
        grid-template-columns: 1fr;
        gap: var(--spacing-xl);
    }
    
    .solution-content {
        flex-direction: column;
    }
    
    .solution-image {
        order: -1;
    }
    
    .cases-grid {
        grid-template-columns: repeat(2, 1fr);
    }
    
    .about-content {
        flex-direction: column;
    }
    
    .about-image {
        order: -1;
        margin-bottom: var(--spacing-lg);
    }
    
    .contact-wrapper {
        flex-direction: column;
    }
    
    .footer-top {
        flex-direction: column;
        gap: var(--spacing-xl);
    }
    
    .footer-links {
        flex-wrap: wrap;
        gap: var(--spacing-xl);
    }
    
    .footer-col {
        flex: 1;
        min-width: 160px;
    }
}

@media (max-width: 768px) {
    :root {
        --container-width: 720px;
        --container-padding: 16px;
    }
    
    .header-wrapper {
        height: 70px;
    }
    
    .main-nav {
        position: fixed;
        top: 70px;
        left: 0;
        width: 100%;
        height: 0;
        background-color: var(--bg-light);
        overflow: hidden;
        transition: height var(--transition-normal);
        box-shadow: var(--shadow-md);
    }
    
    .main-nav.active {
        height: calc(100vh - 70px);
        overflow-y: auto;
    }
    
    .main-nav .nav-list {
        flex-direction: column;
        padding: var(--spacing-lg);
        gap: var(--spacing-md);
    }
    
    .main-nav .nav-list a {
        display: block;
        padding: var(--spacing-sm) 0;
    }
    
    .menu-toggle {
        display: block;
    }
    
    .menu-toggle.active span:nth-child(1) {
        transform: rotate(45deg) translate(8px, 8px);
    }
    
    .menu-toggle.active span:nth-child(2) {
        opacity: 0;
    }
    
    .menu-toggle.active span:nth-child(3) {
        transform: rotate(-45deg) translate(7px, -7px);
    }
    
    .header-cta {
        display: none;
    }
    
    .hero-section {
        padding-top: 120px;
    }
    
    .hero-section .container {
        flex-direction: column;
    }
    
    .hero-content {
        order: -1;
        text-align: center;
    }
    
    .hero-buttons {
        justify-content: center;
    }
    
    .stats-grid {
        flex-wrap: wrap;
    }
    
    .stat-item {
        width: 50%;
        margin-bottom: var(--spacing-md);
    }
    
    .solution-content {
        padding: var(--spacing-md);
    }
    
    .tab-btn {
        padding: var(--spacing-sm) var(--spacing-md);
        font-size: 1rem;
    }
    
    .cases-grid {
        grid-template-columns: 1fr;
    }
    
    .about-values {
        grid-template-columns: 1fr;
    }
    
    #contactForm {
        grid-template-columns: 1fr;
    }
    
    .footer-bottom {
        flex-direction: column;
        gap: var(--spacing-md);
        text-align: center;
    }
    
    .partners-grid {
        grid-template-columns: repeat(3, 1fr);
    }
}

@media (max-width: 576px) {
    :root {
        --container-width: 100%;
        --container-padding: 12px;
    }
    
    .hero-section h1 {
        font-size: 2rem;
    }
    
    .hero-buttons {
        flex-direction: column;
        gap: var(--spacing-sm);
    }
    
    .section-header h2 {
        font-size: 1.8rem;
    }
    
    .advantages-grid {
        grid-template-columns: 1fr;
    }
    
    .solution-features {
        column-count: 1;
    }
    
    .testimonial-content {
        padding: var(--spacing-md);
    }
    
    .partners-grid {
        grid-template-columns: repeat(2, 1fr);
    }
    
    .tabs-nav {
        flex-wrap: wrap;
        justify-content: flex-start;
    }
    
    .tab-btn {
        flex: 1 0 50%;
        text-align: center;
    }
}