CSS Animation Library Builder

I need a custom CSS animation library for my project.

**Animation Types Needed:**
- Entrances: [fade, slide, zoom, etc.]
- Exits: [fade, slide, zoom, etc.]
- Attention: [bounce, shake, pulse, etc.]
- Loaders: [spinner, dots, bars, etc.]

**Design Style:**
- Feel: [subtle/playful/professional]
- Duration preferences: [fast/medium/slow]
- Easing preferences: [linear/ease/custom]

**Implementation:**
- Framework: [CSS/Sass/Tailwind plugin]
- Trigger method: [classes/JS/both]

**Performance Considerations:**
- GPU acceleration: [required/optional]
- Reduced motion support: [required/optional]

Please provide:
1. Complete animation keyframes
2. Utility classes for each animation
3. Duration and delay variants
4. Easing function options
5. Composition patterns
6. Reduced motion alternatives
7. Usage documentation