/* responsive.css - 响应式样式 */

/* 大型桌面显示器 (1200px以上) */
@media (min-width: 1200px) {
  .container {
    max-width: 1140px;
  }
}

/* 桌面显示器 (992px到1199px) */
@media (max-width: 1199px) {
  .container {
    max-width: 960px;
  }
  
  .hero h1 {
    font-size: 3rem;
  }
  
  .timeline-item {
    padding: 10px 30px;
  }
}

/* 平板设备 (768px到991px) */
@media (max-width: 991px) {
  .container {
    max-width: 720px;
  }
  
  html {
    font-size: 15px;
  }
  
  .hero {
    height: 70vh;
  }
  
  .hero h1 {
    font-size: 2.5rem;
  }
  
  .grid {
    grid-template-columns: repeat(auto-fill, minmax(250px, 1fr));
  }
  
  .footer-section {
    min-width: 250px;
  }
}

/* 大型手机 (576px到767px) */
@media (max-width: 767px) {
  .container {
    max-width: 540px;
  }
  
  html {
    font-size: 14px;
  }
  
  .header-container {
    flex-direction: column;
    text-align: center;
  }
  
  .logo {
    margin-bottom: var(--spacing-sm);
  }
  
  .hero {
    height: 60vh;
    text-align: center;
  }
  
  .hero-content {
    margin: 0 auto;
  }
  
  .hero h1 {
    font-size: 2rem;
  }
  
  .timeline::after {
    left: 31px;
  }
  
  .timeline-item {
    width: 100%;
    padding-left: 70px;
    padding-right: 25px;
  }
  
  .timeline-item::after {
    left: 19px;
  }
  
  .timeline-item-right {
    left: 0;
  }
  
  .footer-container {
    flex-direction: column;
  }
  
  .footer-section {
    width: 100%;
  }
  
  /* 显示移动菜单 */
  .menu-toggle {
    display: block;
    margin-top: var(--spacing-sm);
  }
  
  .nav {
    width: 100%;
    max-height: 0;
    overflow: hidden;
    transition: max-height 0.3s ease;
  }
  
  .nav.show {
    max-height: 500px;
  }
  
  .nav-list {
    flex-direction: column;
    width: 100%;
    padding-top: var(--spacing-md);
  }
  
  .nav-item {
    margin: 0;
    text-align: center;
    width: 100%;
  }
  
  .nav-link {
    display: block;
    padding: var(--spacing-sm);
  }
}

/* 小型手机 (575px以下) */
@media (max-width: 575px) {
  .container {
    width: 100%;
    padding: 0 var(--spacing-md);
  }
  
  html {
    font-size: 13px;
  }
  
  h1 {
    font-size: 2rem;
  }
  
  h2 {
    font-size: 1.7rem;
  }
  
  h3 {
    font-size: 1.3rem;
  }
  
  .hero {
    height: 50vh;
  }
  
  .hero h1 {
    font-size: 1.8rem;
  }
  
  .section {
    padding: var(--spacing-lg) 0;
  }
  
  .grid {
    grid-template-columns: 1fr;
  }
  
  .search-form {
    flex-direction: column;
  }
  
  .search-input {
    border-radius: var(--border-radius-sm);
    border-right: 1px solid #ddd;
    margin-bottom: var(--spacing-xs);
  }
  
  .search-btn {
    border-radius: var(--border-radius-sm);
    width: 100%;
    padding: var(--spacing-sm);
  }
  
  .download-card {
    flex-direction: column;
    text-align: center;
  }
  
  .download-icon {
    margin-right: 0;
    margin-bottom: var(--spacing-sm);
  }
}