/* ========================================
   文件说明：动画效果
   文件路径：css/common/animations.css
   ======================================== */

/* 淡入 */
@keyframes fadeIn {
  from { opacity: 0; }
  to { opacity: 1; }
}

/* 从下方滑入 */
@keyframes slideUp {
  from {
    opacity: 0;
    transform: translateY(20px);
  }
  to {
    opacity: 1;
    transform: translateY(0);
  }
}

/* 从左侧滑入 */
@keyframes slideInLeft {
  from {
    opacity: 0;
    transform: translateX(-20px);
  }
  to {
    opacity: 1;
    transform: translateX(0);
  }
}

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

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

/* 动画工具类 */
.animate-fade-in {
  animation: fadeIn var(--transition-base) ease;
}

.animate-slide-up {
  animation: slideUp var(--transition-base) ease;
}

.animate-slide-in-left {
  animation: slideInLeft var(--transition-base) ease;
}

.animate-scale-in {
  animation: scaleIn var(--transition-base) ease;
}

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

/* 悬停效果 */
.hover-lift {
  transition: transform var(--transition-base);
}

.hover-lift:hover {
  transform: translateY(-4px);
}

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

.skeleton {
  background: linear-gradient(90deg, #f0f0f0 25%, #e0e0e0 50%, #f0f0f0 75%);
  background-size: 200% 100%;
  animation: shimmer 1.5s infinite;
  border-radius: var(--radius-sm);
}