/* 
 * 布局切换过渡动画
 * 单栏/双栏切换时显示蓝色矩形跳动加载动画
 */

.grid-layout-transition-overlay {
  position: fixed;
  inset: 0;
  top: 0;
  left: 0;
  right: 0;
  bottom: 0;
  width: 100%;
  height: 100%;
  background: rgba(255, 255, 255, 0.85);
  backdrop-filter: blur(8px);
  -webkit-backdrop-filter: blur(8px);
  display: flex;
  align-items: center;
  justify-content: center;
  z-index: 10005; /* 高于所有内容 */
  opacity: 0;
  visibility: hidden;
  transition: opacity 0.3s ease, visibility 0.3s ease;
  pointer-events: none;
}

/* 暗色模式 */
[data-theme="dark"] .grid-layout-transition-overlay {
  background: rgba(0, 0, 0, 0.85);
}

/* 显示状态 */
.grid-layout-transition-overlay.show {
  opacity: 1;
  visibility: visible;
}

/* 隐藏状态 */
.grid-layout-transition-overlay.hide {
  opacity: 0;
  visibility: hidden;
}

/* 确保内部 loader 始终显示 */
.grid-layout-transition-overlay .loader-rect {
  display: flex;
  justify-content: center;
  align-items: center;
  gap: 4px;
  height: auto;
  background: transparent;
  border: 0;
  padding: 0;
}

/* 蓝色矩形样式 */
.grid-layout-transition-overlay .loader-rect > div {
  width: 10px;
  height: 16px;
  border-radius: 3px;
  background: var(--color-primary, #0066cc);
  box-shadow: 0 0 20px rgba(0, 102, 204, 0.3);
  transform-origin: center bottom;
  backface-visibility: hidden;
  will-change: height;
  animation-play-state: running !important;
}

/* 动画时序（错开跳动） */
.grid-layout-transition-overlay .loader-rect > div:nth-child(1) {
  animation: rect-1 0.9s ease-in-out 0s infinite;
}

.grid-layout-transition-overlay .loader-rect > div:nth-child(2) {
  animation: rect-2 0.9s ease-in-out 0.1s infinite;
}

.grid-layout-transition-overlay .loader-rect > div:nth-child(3) {
  animation: rect-3 0.9s ease-in-out 0.2s infinite;
}

.grid-layout-transition-overlay .loader-rect > div:nth-child(4) {
  animation: rect-4 0.9s ease-in-out 0.3s infinite;
}

.grid-layout-transition-overlay .loader-rect > div:nth-child(5) {
  animation: rect-5 0.9s ease-in-out 0.4s infinite;
}

/* 减少动画偏好：放慢动画 */
@media (prefers-reduced-motion: reduce) {
  .grid-layout-transition-overlay {
    transition-duration: 0.2s;
  }

  .grid-layout-transition-overlay .loader-rect > div {
    animation-duration: 1.2s !important;
  }
}