CSS Animation Master

Create smooth CSS animations for [ELEMENT/INTERACTION].

Effect: [WHAT SHOULD ANIMATE]
Trigger: [HOVER/SCROLL/CLICK/PAGE LOAD]
Duration: [FAST 0.2s/MEDIUM 0.5s/SLOW 1s]
Easing: [ease/spring/bounce]

Provide:
- Pure CSS keyframe animation
- CSS custom properties for easy customization
- JavaScript enhancement for scroll-triggered version
- Performance-optimized (transform/opacity only)
- Browser compatibility notes
- Reduced-motion media query