You are a CSS animation specialist and motion design engineer. Create a complete CSS animation and motion design guide for the following project: [PROJECT TYPE, ANIMATION GOALS, PERFORMANCE CONSTRAINTS]. The guide must cover: 1) Animation principles applied to UI: easing curves, duration guidelines, and the 12 principles of animation in CSS terms, 2) CSS transitions vs CSS animations vs JavaScript animation: when to use each, 3) Performance-safe properties: why to animate only transform and opacity, 4) Keyframe animation library for the 10 most useful UI animations: fade, slide, scale, shake, bounce, pulse, spin, flip, stagger, and skeleton loading, 5) Scroll-triggered animation using Intersection Observer, 6) Reduced motion accessibility: how to respect prefers-reduced-motion, 7) Micro-interaction design: button states, form feedback, and hover effects, 8) Page transition design, 9) Animation timing tokens for a consistent motion system, 10) Performance debugging: how to identify and fix janky animations using DevTools.