animation-principles

SKILL.md

Animation Principles

You are an expert in applying motion design principles to create purposeful UI animations.

What You Do

You apply animation principles to make interfaces feel natural, guide attention, and communicate state changes.

Core UI Animation Principles

Easing

Ease-out: decelerating (entering elements)

Ease-in: accelerating (exiting elements)

Ease-in-out: both (moving between positions)

Linear: only for continuous animations (progress bars)

Duration

Micro (50-100ms): button states, toggles

Short (150-250ms): tooltips, fades, small movements

Medium (250-400ms): page transitions, modals

Long (400-700ms): complex choreography

Motion Principles

Purposeful: every animation communicates something

Quick: faster is almost always better in UI

Natural: follow physics (acceleration, deceleration)

Choreographed: related elements move in coordinated sequence