/* 响应式布局系统 - 基于全球最佳实践 */

/* ===== 断点系统 ===== */
/* 基于主流设备尺寸定义断点 */

/* 小屏手机: 320-480px (iPhone SE, 小屏Android) */
@media (max-width: 480px) {
  .container {
    padding: 16rpx;
  }
  
  .text-responsive {
    font-size: 26rpx;
  }
  
  .btn-responsive {
    min-height: 80rpx;
    font-size: 26rpx;
  }
  
  .card-responsive {
    margin: 8rpx;
    padding: 16rpx;
  }
  
  .avatar-responsive {
    width: 64rpx;
    height: 64rpx;
  }
}

/* 中屏手机: 481-600px (iPhone 6/7/8, 中等Android) */
@media (min-width: 481px) and (max-width: 600px) {
  .container {
    padding: 24rpx;
  }
  
  .text-responsive {
    font-size: 28rpx;
  }
  
  .btn-responsive {
    min-height: 88rpx;
    font-size: 28rpx;
  }
  
  .card-responsive {
    margin: 12rpx;
    padding: 20rpx;
  }
  
  .avatar-responsive {
    width: 72rpx;
    height: 72rpx;
  }
}

/* 大屏手机: 601-768px (iPhone Plus/Pro, 大屏Android) */
@media (min-width: 601px) and (max-width: 768px) {
  .container {
    padding: 32rpx;
  }
  
  .text-responsive {
    font-size: 30rpx;
  }
  
  .btn-responsive {
    min-height: 96rpx;
    font-size: 30rpx;
  }
  
  .card-responsive {
    margin: 16rpx;
    padding: 24rpx;
  }
  
  .avatar-responsive {
    width: 80rpx;
    height: 80rpx;
  }
}

/* 平板设备: 769px+ (iPad, 大屏平板) */
@media (min-width: 769px) {
  .container {
    padding: 48rpx;
    max-width: 1200rpx;
    margin: 0 auto;
  }
  
  .text-responsive {
    font-size: 32rpx;
  }
  
  .btn-responsive {
    min-height: 104rpx;
    font-size: 32rpx;
  }
  
  .card-responsive {
    margin: 20rpx;
    padding: 32rpx;
  }
  
  .avatar-responsive {
    width: 96rpx;
    height: 96rpx;
  }
  
  /* 平板专用布局 */
  .tablet-grid {
    display: grid;
    grid-template-columns: repeat(auto-fit, minmax(300rpx, 1fr));
    gap: 24rpx;
  }
  
  .tablet-sidebar {
    width: 300rpx;
    position: fixed;
    left: 0;
    top: 0;
    bottom: 0;
    background: var(--bg-primary);
    border-right: 1rpx solid var(--border-light);
  }
  
  .tablet-main {
    margin-left: 300rpx;
    padding: 24rpx;
  }
}

/* ===== 屏幕密度适配 ===== */
/* 基于设备像素比优化显示效果 */

/* 低密度屏幕 (dpr <= 1.5) */
@media (-webkit-max-device-pixel-ratio: 1.5) {
  .border-thin {
    border-width: 1rpx;
  }
  
  .shadow-responsive {
    box-shadow: 0 2rpx 4rpx rgba(0, 0, 0, 0.1);
  }
}

/* 中密度屏幕 (1.5 < dpr <= 2.5) */
@media (-webkit-min-device-pixel-ratio: 1.5) and (-webkit-max-device-pixel-ratio: 2.5) {
  .border-thin {
    border-width: 1rpx;
  }
  
  .shadow-responsive {
    box-shadow: 0 4rpx 8rpx rgba(0, 0, 0, 0.12);
  }
}

/* 高密度屏幕 (dpr > 2.5) */
@media (-webkit-min-device-pixel-ratio: 2.5) {
  .border-thin {
    border-width: 2rpx;
  }
  
  .shadow-responsive {
    box-shadow: 0 6rpx 12rpx rgba(0, 0, 0, 0.15);
  }
}

/* ===== 方向适配 ===== */
/* 横屏和竖屏的不同布局 */

/* 竖屏模式 */
@media (orientation: portrait) {
  .orientation-adaptive {
    flex-direction: column;
  }
  
  .portrait-only {
    display: block;
  }
  
  .landscape-only {
    display: none;
  }
  
  .portrait-stack {
    flex-direction: column;
  }
  
  .portrait-full-width {
    width: 100%;
  }
}

/* 横屏模式 */
@media (orientation: landscape) {
  .orientation-adaptive {
    flex-direction: row;
  }
  
  .portrait-only {
    display: none;
  }
  
  .landscape-only {
    display: block;
  }
  
  .landscape-split {
    flex-direction: row;
  }
  
  .landscape-half-width {
    width: 50%;
  }
  
  /* 横屏时减少垂直间距 */
  .landscape-compact {
    padding-top: 16rpx;
    padding-bottom: 16rpx;
  }
}

/* ===== 触摸友好设计 ===== */
/* 基于人体工程学的触摸区域设计 */

/* 最小触摸目标 (44px = 88rpx) */
.touch-target-min {
  min-width: 88rpx;
  min-height: 88rpx;
}

/* 推荐触摸目标 (48px = 96rpx) */
.touch-target-recommended {
  min-width: 96rpx;
  min-height: 96rpx;
}

/* 大触摸目标 (56px = 112rpx) */
.touch-target-large {
  min-width: 112rpx;
  min-height: 112rpx;
}

/* 触摸间距 (8px = 16rpx) */
.touch-spacing {
  margin: 16rpx;
}

/* ===== 可访问性增强 ===== */
/* 提升用户体验的可访问性设计 */

/* 高对比度模式 */
@media (prefers-contrast: high) {
  .accessible-text {
    color: #000000;
    background: #ffffff;
  }
  
  .accessible-border {
    border: 2rpx solid #000000;
  }
}

/* 减少动画模式 */
@media (prefers-reduced-motion: reduce) {
  .motion-safe {
    animation: none;
    transition: none;
  }
}

/* 深色模式适配 */
@media (prefers-color-scheme: dark) {
  .dark-adaptive {
    background: #1a1a1a;
    color: #ffffff;
  }
  
  .dark-card {
    background: #2a2a2a;
    border-color: #404040;
  }
  
  .dark-border {
    border-color: #404040;
  }
}

/* ===== 网格系统 ===== */
/* 灵活的响应式网格布局 */

.grid {
  display: grid;
  gap: 24rpx;
}

.grid-1 { grid-template-columns: 1fr; }
.grid-2 { grid-template-columns: repeat(2, 1fr); }
.grid-3 { grid-template-columns: repeat(3, 1fr); }
.grid-4 { grid-template-columns: repeat(4, 1fr); }

/* 响应式网格 */
.grid-responsive {
  display: grid;
  gap: 24rpx;
  grid-template-columns: repeat(auto-fit, minmax(280rpx, 1fr));
}

/* 网格项目 */
.grid-item {
  min-width: 0; /* 防止内容溢出 */
}

.grid-span-2 { grid-column: span 2; }
.grid-span-3 { grid-column: span 3; }
.grid-span-4 { grid-column: span 4; }

/* ===== 弹性布局增强 ===== */
/* 现代化的Flexbox布局工具 */

.flex-responsive {
  display: flex;
  flex-wrap: wrap;
  gap: 16rpx;
}

.flex-item {
  flex: 1 1 auto;
  min-width: 0;
}

.flex-item-grow {
  flex-grow: 1;
}

.flex-item-shrink {
  flex-shrink: 1;
}

.flex-item-no-shrink {
  flex-shrink: 0;
}

/* ===== 容器查询模拟 ===== */
/* 基于容器大小的样式调整 */

.container-sm {
  max-width: 640rpx;
}

.container-md {
  max-width: 768rpx;
}

.container-lg {
  max-width: 1024rpx;
}

.container-xl {
  max-width: 1280rpx;
}

.container-responsive {
  width: 100%;
  margin: 0 auto;
  padding: 0 24rpx;
}

/* ===== 文字响应式 ===== */
/* 基于屏幕大小的文字缩放 */

.text-scale-sm {
  font-size: clamp(20rpx, 2.5vw, 24rpx);
}

.text-scale-md {
  font-size: clamp(24rpx, 3vw, 28rpx);
}

.text-scale-lg {
  font-size: clamp(28rpx, 3.5vw, 32rpx);
}

.text-scale-xl {
  font-size: clamp(32rpx, 4vw, 40rpx);
}

/* ===== 间距响应式 ===== */
/* 基于屏幕大小的间距调整 */

.spacing-responsive {
  padding: clamp(16rpx, 3vw, 32rpx);
}

.margin-responsive {
  margin: clamp(8rpx, 2vw, 24rpx);
}

.gap-responsive {
  gap: clamp(12rpx, 2.5vw, 24rpx);
}