/* 响应式设计 */

/* 平板设备 (768px - 1024px) */
@media (max-width: 1024px) {
  .container {
    padding: 0 15px;
  }

  .hero-title {
    font-size: 36px;
  }

  .hero-subtitle {
    font-size: 18px;
  }

  .section-title {
    font-size: 28px;
  }

  .highlights-grid {
    grid-template-columns: repeat(auto-fit, minmax(250px, 1fr));
    gap: 20px;
  }

  .contact-grid {
    grid-template-columns: repeat(2, 1fr);
  }
}

/* 移动设备 (< 768px) */
@media (max-width: 768px) {
  /* 页头 */
  .company-name {
    font-size: 20px;
  }

  .company-slogan {
    font-size: 12px;
  }

  .logo {
    height: 45px;
  }

  /* 导航 - 汉堡菜单 */
  .mobile-menu-toggle {
    display: block;
    color: white;
  }

  .nav-menu {
    display: none;
    flex-direction: column;
    position: absolute;
    top: 100%;
    left: 0;
    right: 0;
    background-color: var(--secondary-color);
    box-shadow: var(--shadow);
  }

  .nav-menu.active {
    display: flex;
  }

  .nav-item {
    width: 100%;
    border-bottom: 1px solid rgba(255, 255, 255, 0.1);
  }

  .nav-link {
    padding: 15px 20px;
  }

  /* 首页 */
  .hero-section {
    padding: 50px 0;
  }

  .hero-title {
    font-size: 28px;
  }

  .hero-subtitle {
    font-size: 16px;
  }

  .intro-section,
  .highlights-section {
    padding: 40px 0;
  }

  .section-title {
    font-size: 24px;
  }

  .intro-text {
    font-size: 16px;
  }

  .highlights-grid {
    grid-template-columns: 1fr;
    gap: 20px;
  }

  .highlight-card {
    padding: 20px;
  }

  /* 页面头部 */
  .page-header {
    padding: 30px 0;
  }

  .page-title {
    font-size: 28px;
  }

  .page-subtitle {
    font-size: 16px;
  }

  /* 关于我们 */
  .about-section {
    padding: 40px 0;
  }

  .block-title {
    font-size: 20px;
  }

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

  /* 业务范围 */
  .business-section {
    padding: 40px 0;
  }

  .business-item {
    flex-direction: column;
    padding: 20px;
  }

  .business-item:hover {
    transform: translateX(0);
    transform: translateY(-5px);
  }

  .business-number {
    font-size: 28px;
  }

  .business-title {
    font-size: 20px;
  }

  .business-description {
    font-size: 15px;
  }

  /* 联系我们 */
  .contact-section {
    padding: 40px 0;
  }

  .contact-grid {
    grid-template-columns: 1fr;
    gap: 20px;
  }

  .contact-item {
    padding: 20px;
  }

  .contact-icon {
    font-size: 36px;
  }

  .contact-title {
    font-size: 18px;
  }

  .contact-info {
    padding: 20px;
  }

  /* 404 页面 */
  .error-section {
    padding: 60px 0;
  }

  .error-code {
    font-size: 80px;
  }

  .error-title {
    font-size: 24px;
  }

  .error-message {
    font-size: 16px;
  }

  /* 页脚 */
  .site-footer {
    padding: 30px 0 15px;
  }

  .footer-content {
    flex-direction: column;
    text-align: center;
  }

  .footer-info .company-name {
    font-size: 16px;
  }

  .copyright,
  .icp-info {
    font-size: 13px;
  }
}

/* 小屏幕移动设备 (< 480px) */
@media (max-width: 480px) {
  .container {
    padding: 0 10px;
  }

  .hero-title {
    font-size: 24px;
  }

  .hero-subtitle {
    font-size: 14px;
  }

  .section-title {
    font-size: 22px;
  }

  .page-title {
    font-size: 24px;
  }

  .card-title,
  .business-title {
    font-size: 18px;
  }

  .error-code {
    font-size: 60px;
  }
}

/* 打印样式 */
@media print {
  .main-nav,
  .mobile-menu-toggle,
  .btn-home {
    display: none;
  }

  body {
    font-size: 12pt;
    color: black;
  }

  .site-header,
  .site-footer {
    background-color: white;
    color: black;
  }

  a {
    text-decoration: underline;
  }
}