/* =====================================================
   简化动画系统 - 参考下载页设计
   最小化动效 | 高性能 | 简洁
   版本: v4.0 Simplified Animations
   ===================================================== */

/* ===== 基础淡入动画 ===== */
@keyframes fadeIn {
  from {
    opacity: 0;
  }
  to {
    opacity: 1;
  }
}

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

/* ===== 滚动显示动画（可选） ===== */
.fade-in {
  animation: fadeIn 0.6s ease;
}

.fade-in-up {
  animation: fadeInUp 0.6s ease;
}

/* ===== 滚动触发动画（简化版） ===== */
.scroll-reveal {
  opacity: 1;
}

.scroll-animate {
  opacity: 1;
}

/* ===== 低端设备优化 ===== */
.low-end-device * {
  animation: none !important;
  transition: none !important;
}

/* ===== 无障碍支持 ===== */
@media (prefers-reduced-motion: reduce) {
  *,
  *::before,
  *::after {
    animation-duration: 0.01ms !important;
    animation-iteration-count: 1 !important;
    transition-duration: 0.01ms !important;
  }
}