/* 响应式设计样式表 */

/* 超小屏幕设备 (手机, 小于 576px) */
@media (max-width: 575.98px) {
  .container {
    padding: 0 10px;
  }

  .header-top {
    flex-direction: column;
    text-align: center;
  }

  .logo {
    margin-bottom: 20px;
  }

  .logo img {
    height: 50px;
  }

  .main-nav ul {
    flex-wrap: wrap;
    justify-content: center;
  }

  .main-nav li {
    margin: 5px;
  }

  .hero-content h2 {
    font-size: 1.5rem;
  }

  .hero-content p {
    font-size: 1rem;
  }

  .btn-primary, .btn-secondary {
    display: block;
    margin: 10px auto;
    width: 80%;
    max-width: 250px;
  }

  .section-title h2 {
    font-size: 1.5rem;
  }

  .services-grid,
  .why-us-grid {
    grid-template-columns: 1fr;
  }

  .about-content,
  .contact-content {
    grid-template-columns: 1fr;
    gap: 30px;
  }

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

  .portfolio-item {
    height: 200px;
  }
}

/* 小屏幕设备 (平板, 576px 到 767.98px) */
@media (min-width: 576px) and (max-width: 767.98px) {
  .header-top {
    flex-direction: column;
    align-items: center;
  }

  .main-nav ul {
    flex-wrap: wrap;
    justify-content: center;
  }

  .main-nav li {
    margin: 5px 10px;
  }

  .hero-content h2 {
    font-size: 1.8rem;
  }

  .about-content,
  .contact-content {
    grid-template-columns: 1fr;
  }

  .services-grid,
  .why-us-grid,
  .portfolio-grid {
    grid-template-columns: 1fr;
  }

  .portfolio-item {
    height: 220px;
  }
}

/* 中等屏幕设备 (桌面显示器, 768px 到 991.98px) */
@media (min-width: 768px) and (max-width: 991.98px) {
  .about-content,
  .contact-content {
    grid-template-columns: 1fr;
    text-align: center;
  }

  .about-image img {
    max-width: 100%;
  }

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

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

/* 大屏幕设备 (大桌面显示器, 992px 到 1199.98px) */
@media (min-width: 992px) and (max-width: 1199.98px) {
  .services-grid {
    grid-template-columns: repeat(2, 1fr);
  }

  .portfolio-grid {
    grid-template-columns: repeat(3, 1fr);
  }
}

/* 超大屏幕设备 (超大桌面显示器, 1200px 及以上) */
@media (min-width: 1200px) {
  .container {
    max-width: 1300px;
  }
}

/* 导航菜单的移动端适配 */
@media (max-width: 991.98px) {
  .main-nav {
    width: 100%;
    margin-top: 15px;
  }

  .main-nav ul {
    flex-direction: column;
    align-items: center;
  }

  .main-nav li {
    margin: 5px 0;
  }

  .mobile-menu-toggle {
    display: block;
    background: none;
    border: none;
    font-size: 1.5rem;
    cursor: pointer;
    color: white;
  }
}

/* 打印样式 */
@media print {
  body {
    font-size: 12pt;
    color: black;
    background: white;
  }

  .header-section,
  .services-section,
  .about-section,
  .why-us-section,
  .portfolio-section,
  .contact-section,
  .footer-section {
    background: white;
    color: black;
  }

  nav,
  .cta-buttons,
  .portfolio-overlay {
    display: none;
  }

  .section-title,
  .about-text,
  .reason,
  .contact-info {
    page-break-inside: avoid;
  }
}

/* 高对比度模式 */
@media (prefers-contrast: high) {
  body {
    background-color: white;
    color: black;
  }

  .service-card,
  .portfolio-item,
  .contact-form {
    border: 2px solid black;
  }

  .btn-primary,
  .btn-secondary {
    border: 2px solid black;
  }
}

/* 减少动画偏好 */
@media (prefers-reduced-motion: reduce) {
  *,
  *::before,
  *::after {
    animation-duration: 0.01ms !important;
    animation-iteration-count: 1 !important;
    transition-duration: 0.01ms !important;
  }
}