/* 响应式设计 */
@media (max-width: 1200px) {
  .products-grid {
    grid-template-columns: repeat(auto-fit, minmax(320px, 1fr));
  }
}

@media (max-width: 992px) {
  .desktop-nav {
    display: none;
  }
  
  .mobile-menu-button {
    display: block;
  }
  
  .hero {
    padding: 80px 0;
  }
  
  .hero h1 {
    font-size: 40px;
  }
  
  .products-grid {
    grid-template-columns: 1fr;
    gap: 20px;
  }
  
  .product-card {
    padding: 25px;
  }
  
  .about-content {
    flex-direction: column;
    text-align: center;
  }
  
  .about-text {
    padding-right: 0;
  }
  
  .about-stats {
    flex-direction: column;
    gap: 20px;
  }
  
  .footer-content {
    flex-direction: column;
  }
  
  .footer-column:not(.company-info) {
    flex: 1 1 calc(50% - 15px);
  }
  
  .company-info {
    flex: 1 1 100%;
    text-align: center;
  }
  
  .footer-desc {
    margin-left: auto;
    margin-right: auto;
  }
  
  .footer-contact {
    justify-content: center;
  }
  
  .about-column {
    text-align: left;
  }
  
  .modal-body {
    flex-direction: column;
    text-align: center;
  }
  
  .modal-info {
    padding-left: 0;
    margin-top: 25px;
  }
  
  .contact-qrcode {
    display: none;
  }
}

@media (max-width: 768px) {
  .hero h1 {
    font-size: 32px;
  }
  
  .hero-buttons {
    flex-direction: column;
    gap: 15px;
  }
  
  .btn-primary, .btn-secondary {
    width: 100%;
    max-width: 250px;
    margin: 0 auto;
  }
  
  .products-grid {
    grid-template-columns: 1fr;
  }
  
  .product-card {
    flex-direction: column;
    text-align: center;
    padding: 20px;
  }
  
  .product-icon {
    margin-right: 0;
    margin-bottom: 15px;
  }
  
  .product-features {
    justify-content: center;
  }
  
  .footer-column:not(.company-info) {
    flex: 1 1 100%;
  }
  
  .footer-bottom {
    flex-direction: column;
    text-align: center;
  }
  
  .icp-info {
    flex-direction: column;
    gap: 10px;
  }
  
  .about-stats {
    gap: 15px;
  }
  
  .modal-content {
    padding: 30px 20px;
  }
}

@media (max-width: 480px) {
  .hero h1 {
    font-size: 28px;
  }
  
  .hero p {
    font-size: 16px;
  }
  
  .products h2,
  .solutions h2,
  .about h2 {
    font-size: 24px;
  }
  
  .product-card {
    padding: 20px 15px;
  }
  
  .solution-item {
    padding: 30px 20px;
  }
  
  .modal-content {
    padding: 25px 15px;
  }
  
  .modal-body {
    margin-bottom: 20px;
    padding-bottom: 20px;
  }
  
  .modal-info h3 {
    font-size: 24px;
  }
}