/**
 * 优化的动画和过渡效果
 * 使用transform和opacity避免触发重排
 */

/* 淡入动画 - 仅使用opacity */
@keyframes fadeIn {
  from { opacity: 0; }
  to { opacity: 1; }
}

/* 淡出动画 */
@keyframes fadeOut {
  from { opacity: 1; }
  to { opacity: 0; }
}

/* 滑入动画 - 使用transform */
@keyframes slideInUp {
  from {
    opacity: 0;
    transform: translateY(20px);
  }
  to {
    opacity: 1;
    transform: translateY(0);
  }
}

@keyframes slideInDown {
  from {
    opacity: 0;
    transform: translateY(-20px);
  }
  to {
    opacity: 1;
    transform: translateY(0);
  }
}

@keyframes slideInLeft {
  from {
    opacity: 0;
    transform: translateX(-20px);
  }
  to {
    opacity: 1;
    transform: translateX(0);
  }
}

@keyframes slideInRight {
  from {
    opacity: 0;
    transform: translateX(20px);
  }
  to {
    opacity: 1;
    transform: translateX(0);
  }
}

/* 缩放动画 - 使用transform */
@keyframes scaleIn {
  from {
    opacity: 0;
    transform: scale(0.9);
  }
  to {
    opacity: 1;
    transform: scale(1);
  }
}

/* 脉冲动画 */
@keyframes pulse {
  0%, 100% { opacity: 1; }
  50% { opacity: 0.5; }
}

/* 旋转动画 */
@keyframes spin {
  from { transform: rotate(0deg); }
  to { transform: rotate(360deg); }
}

/* 骨架屏闪烁 */
@keyframes shimmer {
  0% { background-position: 200% 0; }
  100% { background-position: -200% 0; }
}

/* 动画工具类 */
.animate-fade-in {
  animation: fadeIn 0.3s ease-out;
}

.animate-fade-out {
  animation: fadeOut 0.3s ease-out;
}

.animate-slide-up {
  animation: slideInUp 0.3s ease-out;
}

.animate-slide-down {
  animation: slideInDown 0.3s ease-out;
}

.animate-slide-left {
  animation: slideInLeft 0.3s ease-out;
}

.animate-slide-right {
  animation: slideInRight 0.3s ease-out;
}

.animate-scale-in {
  animation: scaleIn 0.3s ease-out;
}

.animate-pulse {
  animation: pulse 2s cubic-bezier(0.4, 0, 0.6, 1) infinite;
}

.animate-spin {
  animation: spin 1s linear infinite;
}

/* 过渡效果 - 使用transform和opacity */
.transition-all {
  transition-property: transform, opacity;
  transition-timing-function: cubic-bezier(0.4, 0, 0.2, 1);
  transition-duration: 150ms;
}

.transition-transform {
  transition-property: transform;
  transition-timing-function: cubic-bezier(0.4, 0, 0.2, 1);
  transition-duration: 150ms;
}

.transition-opacity {
  transition-property: opacity;
  transition-timing-function: cubic-bezier(0.4, 0, 0.2, 1);
  transition-duration: 150ms;
}

/* 将元素提升到合成层 */
.will-change-transform {
  will-change: transform;
}

.will-change-opacity {
  will-change: opacity;
}

/* GPU加速 */
.gpu-accelerated {
  transform: translateZ(0);
  backface-visibility: hidden;
  perspective: 1000px;
}

/* 减少运动偏好 */
@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;
  }
  
  .animate-fade-in,
  .animate-slide-up,
  .animate-scale-in {
    animation: none;
  }
}