/* 响应式设计 */
@media (max-width: 992px) {
  .hero .container {
    flex-direction: column;
    text-align: center;
  }
  
  .hero-content, .hero-image {
    width: 100%;
  }
  
  .hero-image {
    margin-top: 40px;
  }
  
  .hero-stats {
    justify-content: center;
  }
  
  .data-table th, .data-table td {
    padding: 12px 8px;
    font-size: 14px;
  }
}

@media (max-width: 768px) {
  .navbar .container {
    flex-wrap: wrap;
  }
  
  .menu-toggle {
    display: block;
  }
  
  .nav-menu {
    display: none;
    flex-direction: column;
    width: 100%;
    margin-top: 20px;
  }
  
  .nav-menu.show {
    display: flex;
  }
  
  .nav-menu li {
    margin: 5px 0;
  }
  
  .hero h1 {
    font-size: 32px;
  }
  
  .hero p {
    font-size: 16px;
  }
  
  .stat-number {
    font-size: 28px;
  }
  
  .section-header h2 {
    font-size: 28px;
  }
  
  .data-controls {
    flex-direction: column;
    gap: 15px;
    align-items: flex-start;
  }
  
  .data-summary {
    grid-template-columns: 1fr;
  }
  
  .features-grid {
    grid-template-columns: 1fr;
  }
  
  .footer-content {
    grid-template-columns: 1fr;
  }
}

@media (max-width: 576px) {
  .hero-stats {
    flex-direction: column;
    gap: 20px;
  }
  
  .data-table {
    font-size: 13px;
  }
  
  .data-table th, .data-table td {
    padding: 10px 5px;
  }
  
  .popup-content {
    width: 95%;
  }
}