/* 加载动画和性能优化样式 */

/* 定义CSS变量以便统一管理 */
:root {
  --loader-bg-color: rgba(255, 255, 255, 0.8);
  --loader-spinner-color: #3b82f6;
  --loader-spinner-bg: #dbeafe;
  --loader-text-color: #374151;
  --transition-fast: 0.2s ease;
  --transition-normal: 0.3s ease;
}

/* 加载遮罩层 */
.loading-overlay {
  position: fixed;
  top: 0;
  left: 0;
  right: 0;
  bottom: 0;
  background-color: var(--loader-bg-color);
  display: flex;
  align-items: center;
  justify-content: center;
  z-index: 9999;
  opacity: 0;
  transition: opacity var(--transition-normal);
  backdrop-filter: blur(2px);
}

/* 加载内容容器 */
.loading-content {
  background-color: white;
  border-radius: 8px;
  box-shadow: 0 10px 25px rgba(0, 0, 0, 0.1);
  padding: 2rem;
  text-align: center;
  transform: translateY(0);
  transition: transform var(--transition-fast);
  max-width: 90%;
}

.loading-content:hover {
  transform: translateY(-2px);
  box-shadow: 0 15px 30px rgba(0, 0, 0, 0.15);
}

/* 加载旋转动画 */
.loading-spinner {
  width: 48px;
  height: 48px;
  border: 4px solid var(--loader-spinner-bg);
  border-top-color: var(--loader-spinner-color);
  border-radius: 50%;
  margin: 0 auto 1rem;
  animation: spin 1s linear infinite;
}

@keyframes spin {
  to {
    transform: rotate(360deg);
  }
}

/* 加载消息 */
.loading-message {
  color: var(--loader-text-color);
  font-size: 1rem;
  font-weight: 500;
}

/* 性能优化相关样式 */

/* 减少重排和重绘 */
.no-reflow {
  transform: translateZ(0);
  backface-visibility: hidden;
  will-change: transform;
}

/* 硬件加速 */
.hardware-accelerate {
  transform: translateZ(0);
  backface-visibility: hidden;
}

/* 减少布局偏移 */
.skeleton-loading {
  background: linear-gradient(90deg, #f0f0f0 25%, #f8f8f8 50%, #f0f0f0 75%);
  background-size: 200% 100%;
  animation: shimmer 1.5s infinite;
}

@keyframes shimmer {
  0% {
    background-position: 200% 0;
  }
  100% {
    background-position: -200% 0;
  }
}

/* 优化过渡效果 */
.smooth-transition {
  transition: all var(--transition-fast);
}

/* 减少选择效果，提高性能 */
.no-select {
  user-select: none;
  -webkit-user-select: none;
  -moz-user-select: none;
  -ms-user-select: none;
}

/* 优化输入框聚焦状态 */
.focus-visible-only :focus:not(:focus-visible) {
  outline: none;
}

/* 响应式加载动画调整 */
@media (max-width: 640px) {
  .loading-content {
    padding: 1.5rem;
  }
  
  .loading-spinner {
    width: 40px;
    height: 40px;
  }
  
  .loading-message {
    font-size: 0.9rem;
  }
}

/* 移动设备性能优化 */
@media (prefers-reduced-motion: reduce) {
  .loading-spinner {
    animation-duration: 2s;
  }
  
  .skeleton-loading {
    animation: none;
    background: #f0f0f0;
  }
  
  * {
    transition-duration: 0.01ms !important;
    animation-duration: 0.01ms !important;
    animation-iteration-count: 1 !important;
  }
}

/* 高对比度模式适配 */
@media (prefers-contrast: high) {
  .loading-overlay {
    background-color: rgba(255, 255, 255, 0.9);
  }
  
  .loading-content {
    border: 2px solid #000;
  }
  
  .loading-spinner {
    border-width: 3px;
  }
}

/* 深色模式适配 */
@media (prefers-color-scheme: dark) {
  :root {
    --loader-bg-color: rgba(17, 24, 39, 0.8);
    --loader-text-color: #f3f4f6;
    --loader-spinner-bg: #374151;
  }
  
  .loading-content {
    background-color: #1f2937;
    color: #f3f4f6;
    box-shadow: 0 10px 25px rgba(0, 0, 0, 0.3);
  }
  
  .skeleton-loading {
    background: linear-gradient(90deg, #2d3748 25%, #374151 50%, #2d3748 75%);
  }
}

/* 快速闪烁提示 */
@keyframes flash {
  0%, 100% {
    opacity: 1;
  }
  50% {
    opacity: 0.5;
  }
}

.flash-success {
  animation: flash 0.5s ease-in-out;
  background-color: #dcfce7 !important;
}

/* 内容区域初始隐藏，避免闪烁 */
.tool-content {
  opacity: 0;
  transition: opacity var(--transition-normal);
}

.tool-content.visible {
  opacity: 1;
}