/* 响应式设计样式 */

/* 大屏幕设备 (1200px 及以上) */
@media (min-width: 1200px) {
  .container {
    width: 50%;
    max-width: 1000px;
  }
  
  .hero-section h1 {
    font-size: 3.5rem;
  }
  
  .feature-grid {
    grid-template-columns: repeat(3, 1fr);
  }
  
  .nav-cards {
    grid-template-columns: repeat(2, 1fr);
  }
}

/* 中等屏幕设备 (768px - 1199px) */
@media (max-width: 1199px) and (min-width: 768px) {
  .container {
    width: 70%;
  }
  
  .hero-section h1 {
    font-size: 2.5rem;
  }
  
  .navigation {
    padding: 1rem 3%;
  }
  
  .hero-section {
    padding: 3rem 3% 2rem;
  }
}

/* 平板设备 (768px - 991px) */
@media (max-width: 991px) and (min-width: 768px) {
  .feature-grid {
    grid-template-columns: repeat(2, 1fr);
    gap: 1rem;
  }
  
  .nav-menu {
    gap: 1.5rem;
  }
  
  .nav-link {
    padding: 0.4rem 0.8rem;
    font-size: 0.95rem;
  }
}

/* 小屏幕设备 (576px - 767px) */
@media (max-width: 767px) {
  .container {
    width: 90%;
    padding: 3% 4%;
    margin: 1rem auto;
  }
  
  .hero-section {
    padding: 2rem 4% 1.5rem;
  }
  
  .hero-section h1 {
    font-size: 2rem;
  }
  
  .hero-subtitle {
    font-size: 1rem;
  }
  
  /* 移动端导航 */
  .navigation {
    padding: 1rem 4%;
    position: relative;
  }
  
  .nav-menu {
    position: absolute;
    top: 100%;
    left: 0;
    right: 0;
    background-color: var(--white);
    flex-direction: column;
    gap: 0;
    box-shadow: var(--shadow);
    transform: translateY(-10px);
    opacity: 0;
    visibility: hidden;
    transition: var(--transition);
    z-index: 999;
  }
  
  .nav-menu.active {
    transform: translateY(0);
    opacity: 1;
    visibility: visible;
  }
  
  .nav-menu li {
    border-bottom: 1px solid var(--gray-light);
  }
  
  .nav-menu li:last-child {
    border-bottom: none;
  }
  
  .nav-link {
    display: block;
    padding: 1rem 4%;
    border-radius: 0;
  }
  
  .nav-toggle {
    display: flex;
  }
  
  .nav-toggle.active span:nth-child(1) {
    transform: rotate(45deg) translate(5px, 5px);
  }
  
  .nav-toggle.active span:nth-child(2) {
    opacity: 0;
  }
  
  .nav-toggle.active span:nth-child(3) {
    transform: rotate(-45deg) translate(7px, -6px);
  }
  
  /* 网格布局调整 */
  .feature-grid {
    grid-template-columns: 1fr;
    gap: 1rem;
  }
  
  .nav-cards {
    grid-template-columns: 1fr;
    gap: 1rem;
  }
  
  /* 字体大小调整 */
  h2 {
    font-size: 1.5rem;
  }
  
  h3 {
    font-size: 1.2rem;
  }
  
  .nav-brand h2 {
    font-size: 1.3rem;
  }
  
  /* 间距调整 */
  section {
    margin-bottom: 2rem;
  }
  
  .feature-card,
  .nav-card {
    padding: 1.2rem;
  }
  
  .footer {
    padding: 1.5rem 4%;
    font-size: 0.9rem;
  }
}

/* 超小屏幕设备 (575px 及以下) */
@media (max-width: 575px) {
  .container {
    width: 95%;
    padding: 4% 3%;
  }
  
  .hero-section {
    padding: 1.5rem 3% 1rem;
  }
  
  .hero-section h1 {
    font-size: 1.8rem;
  }
  
  .hero-subtitle {
    font-size: 0.95rem;
  }
  
  .navigation {
    padding: 0.8rem 3%;
  }
  
  .nav-brand h2 {
    font-size: 1.2rem;
  }
  
  .nav-link {
    padding: 0.8rem 3%;
    font-size: 0.9rem;
  }
  
  h2 {
    font-size: 1.3rem;
  }
  
  h3 {
    font-size: 1.1rem;
  }
  
  .feature-card,
  .nav-card {
    padding: 1rem;
  }
  
  .feature-list li {
    padding: 0.6rem 0;
    padding-left: 1.5rem;
    font-size: 0.95rem;
  }
  
  .footer {
    padding: 1.2rem 3%;
    font-size: 0.85rem;
  }
}

/* 横屏模式优化 */
@media (max-height: 500px) and (orientation: landscape) {
  .hero-section {
    padding: 1rem 5%;
  }
  
  .hero-section h1 {
    font-size: 2rem;
    margin-bottom: 0.5rem;
  }
  
  .container {
    margin: 1rem auto;
  }
  
  .navigation {
    padding: 0.5rem 5%;
  }
}

/* 高对比度模式支持 */
@media (prefers-contrast: high) {
  :root {
    --shadow: 0 2px 4px rgba(0,0,0,0.3);
    --shadow-hover: 0 4px 8px rgba(0,0,0,0.4);
  }
  
  .nav-link:hover,
  .nav-link.active {
    background-color: var(--primary-color);
    color: var(--white);
  }
  
  .feature-card,
  .nav-card {
    border: 1px solid var(--gray-medium);
  }
}

/* 减少动画偏好支持 */
@media (prefers-reduced-motion: reduce) {
  * {
    animation-duration: 0.01ms !important;
    animation-iteration-count: 1 !important;
    transition-duration: 0.01ms !important;
  }
  
  .fade-in {
    animation: none;
  }
}

/* 打印样式 */
@media print {
  .navigation,
  .nav-toggle,
  .footer {
    display: none;
  }
  
  .container {
    width: 100%;
    box-shadow: none;
    background-color: transparent;
  }
  
  .hero-section {
    background: none;
    padding: 1rem 0;
  }
  
  .feature-card,
  .nav-card {
    box-shadow: none;
    border: 1px solid #ccc;
    break-inside: avoid;
  }
  
  a {
    color: #000 !important;
    text-decoration: underline;
  }
  
  .nav-card {
    display: block;
  }
}