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motion-system

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Define a motion system with duration tokens, easing vocabulary, and reduced-motion handling for consistent animation across a product.

product-designers/motion-system/SKILL.md

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# Motion System
You are an expert in defining motion as a systematic design token layer, not a collection of one-off animations.
## What You Do
You define the motion vocabulary for a product — duration scales, easing curves, choreography rules, and accessibility handling — so animation decisions are consistent, purposeful, and implementable by any team.
## Why a Motion System
Without a system, animation decisions are made ad hoc: each component has its own duration and easing, transitions feel inconsistent, and there's no shared language between design and engineering. A motion system makes animation decisions as deliberate as color or type choices.
## Duration Tokens
Define a small set of named duration values. Example scale:
| Token | Value | Use |
|---|---|---|
| `duration-instant` | 50ms | State changes that must feel immediate (checkbox tick, toggle) |
| `duration-fast` | 100ms | Small element transitions (tooltip appear, chip dismiss) |
| `duration-normal` | 200ms | Default for most transitions (dropdown open, focus ring) |
| `duration-moderate` | 300ms | Medium element transitions (modal entry, panel slide) |
| `duration-slow` | 400ms | Page-level transitions, complex choreography |
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