/* ================= 响应式样式 ================= */

/* 移动端导航 */
@media (max-width: 768px) {
  .menu-toggle {
    display: block;
  }
  
  .nav-menu {
    position: absolute;
    top: 100%;
    left: 0;
    right: 0;
    background: rgba(10, 13, 18, 0.98);
    backdrop-filter: blur(10px);
    flex-direction: column;
    gap: 0;
    padding: var(--spacing-lg);
    transform: translateY(-100%);
    opacity: 0;
    visibility: hidden;
    transition: all 0.3s ease;
    border-top: 1px solid var(--border-color);
  }
  
  .nav-menu.active {
    transform: translateY(0);
    opacity: 1;
    visibility: visible;
  }
  
  .nav-menu li {
    border-bottom: 1px solid var(--border-color);
  }
  
  .nav-menu li:last-child {
    border-bottom: none;
  }
  
  .nav-menu a {
    display: block;
    padding: var(--spacing-md) 0;
    font-size: 1.125rem;
  }
  
  .header-actions {
    margin-left: var(--spacing-md);
  }
}

/* 平板端优化 */
@media (max-width: 992px) {
  .container {
    padding: 0 var(--spacing-md);
  }
  
  .header-container {
    padding: 0 var(--spacing-md);
  }
  
  .footer-container {
    padding: 0 var(--spacing-md);
  }
  
  .grid-3 {
    grid-template-columns: repeat(2, 1fr);
  }
  
  .grid-4 {
    grid-template-columns: repeat(2, 1fr);
  }
}

/* 小屏幕优化 */
@media (max-width: 576px) {
  .container {
    padding: 0 var(--spacing-sm);
  }
  
  .header-container {
    padding: 0 var(--spacing-sm);
  }
  
  .footer-container {
    padding: 0 var(--spacing-sm);
  }
  
  .grid-2,
  .grid-3,
  .grid-4 {
    grid-template-columns: 1fr;
  }
  
  .btn {
    width: 100%;
    justify-content: center;
  }
  
  .card {
    padding: var(--spacing-lg);
  }
  
  h1 { font-size: 2rem; }
  h2 { font-size: 1.75rem; }
  h3 { font-size: 1.5rem; }
  h4 { font-size: 1.25rem; }
  h5 { font-size: 1.125rem; }
  h6 { font-size: 1rem; }
}

/* 大屏幕优化 */
@media (min-width: 1400px) {
  .container {
    max-width: 1400px;
  }
  
  .header-container {
    max-width: 1400px;
  }
  
  .footer-container {
    max-width: 1400px;
  }
}

/* 高分辨率屏幕优化 */
@media (-webkit-min-device-pixel-ratio: 2), (min-resolution: 192dpi) {
  .site-logo {
    font-weight: 800;
  }
  
  .card {
    border-width: 0.5px;
  }
}

/* 横屏模式优化 */
@media (orientation: landscape) and (max-height: 500px) {
  .site-header {
    height: 60px;
  }
  
  .header-content {
    height: 60px;
  }
  
  .site-main {
    margin-top: 60px;
  }
}

/* 打印样式 */
@media print {
  .site-header,
  .site-footer,
  .btn,
  .menu-toggle {
    display: none !important;
  }
  
  .site-main {
    margin-top: 0;
  }
  
  * {
    background: white !important;
    color: black !important;
    box-shadow: none !important;
  }
  
  a {
    text-decoration: underline;
  }
  
  a[href]:after {
    content: " (" attr(href) ")";
    font-size: 0.8em;
    color: #666;
  }
}

/* 深色模式支持 */
@media (prefers-color-scheme: dark) {
  :root {
    --bg-primary: #0a0d12;
    --bg-secondary: #0e131b;
    --text-primary: #e9eef4;
    --text-secondary: #9fb0c2;
  }
}

/* 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;
    scroll-behavior: auto !important;
  }
  
  .loading {
    animation: none;
  }
}

/* 高对比度模式 */
@media (prefers-contrast: high) {
  :root {
    --border-color: #ffffff;
    --text-secondary: #ffffff;
  }
  
  .card {
    border-width: 2px;
  }
  
  .btn {
    border-width: 2px;
  }
}

/* 焦点可见性优化 */
@media (prefers-reduced-motion: no-preference) {
  .btn:focus-visible,
  .nav-menu a:focus-visible,
  .form-input:focus-visible {
    outline: 2px solid var(--primary-color);
    outline-offset: 2px;
  }
}