动效

时长令牌、Apple 风格缓动以及 reduced-motion 契约。

时长

Token	Value	Use	Anchor
duration-fast	200ms	hover color and transform	bg:motion:duration-fast
duration-normal	300ms	card hover, FAQ answer collapse	bg:motion:duration-normal
duration-slow	600ms	scroll-reveal transitions	bg:motion:duration-slow
duration-colors	150ms	quick color flips	bg:motion:duration-colors

缓动曲线

ease-out

bg:motion:ease-out

ease-apple

cubic-bezier(0.32, 0.72, 0, 1)

bg:motion:ease-apple

卡片提升

card-lift-sm	translateY(-2px)	bg:motion:card-lift-sm
card-lift-md	translateY(-4px)	bg:motion:card-lift-md

减弱动效

硬性规则。每一个动画都必须包含 @media (prefers-reduced-motion: reduce) 覆盖,以将其禁用或替换为静态状态。base.css 中的基础重置已为 reduced-motion 用户中和所有 transition;各组件动画必须额外移除悬停时的 transform。

@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;
  }
}