Authors performant web animations CSS-first AND brainstorms the right feedback for an interaction via a verb-to-motion catalog. Covers GPU-safe properties, modern primitives (@starting-style, interpolate-size), View Transitions, scroll-driven timelines, state-choreography morphs, React state (Motion, AnimatePresence), advanced effects (Liquid Glass, glow, 3D tilt), external engines (Lottie, Rive), React Three Fiber, prefers-reduced-motion, AND perceived performance (skeleton loaders, optimistic UI, loader floor, predictive prefetch, stale-while-revalidate). Use when building transitions, hover effects, route changes, when an animation feels janky, when deciding what feedback an interaction should have, or when the app needs to feel snappier. Triggers on "animate this", "fade in", "hover effect", "liquid glass", "lottie", "rive", "ideal feedback", "how should X feel", "skeleton loader", "perceived performance", "feel faster", "optimistic UI", "/animations".