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dec-design-system-depth

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更新日2026年7月13日 18:05

Design system depth beyond "tokens are data" — three-tier token architecture (primitive → semantic → component), W3C DTCG format and tooling, scales as systems, component API design, headless/unstyled primitives, documentation as product, governance and versioning. Use when architecting a design system, structuring tokens, designing component APIs, choosing headless primitives, or setting up contribution/versioning.

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Design System Depth

A real design system is token architecture + component contracts + governance — not a Figma file of colors.

Three-Tier Token Architecture:
1. Primitive / Global — raw values (blue-500, space-4).
2. Semantic / Alias — intent-mapped (color-action-primary, space-inset-md).
3. Component-Specific — scoped (button-bg-hover). Components only ever consume semantic/component tiers, never primitives.
W3C DTCG Format & Tooling: Design Tokens Community Group spec; Style Dictionary and Tokens Studio transform one source into CSS / iOS / Android / JSON.
Scales as Systems: 4pt/8pt spacing grid, modular type scale (e.g. 1.25 ratio), constrained color ramps. Decisions become lookups.
Component API Design: Props as the contract; variants, sizes, and states as enumerable options; compound components and slots for composition; sensible defaults so the easy thing is the right thing.
Headless / Unstyled Primitives: Radix, React Aria, Ark — accessibility and behavior solved in the primitive, styling left to the system. The modern foundation.
Documentation as Product: Storybook for live docs; usage guidelines, do/don't, props tables treated as part of the deliverable.
Governance & Versioning: Contribution models, semver for breaking changes, deprecation paths, adoption metrics.

How to apply

Never let a component reference a primitive token directly — route through a semantic alias so theming works.
Build behavior/accessibility on a headless primitive, then layer system styling — don't re-solve focus traps and ARIA per component.
Treat the component API as the contract: enumerable variants/sizes/states, good defaults, composition via slots.
Ship docs and a versioning/deprecation policy with the system, or adoption stalls.

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name	dec-design-system-depth
description	Design system depth beyond "tokens are data" — three-tier token architecture (primitive → semantic → component), W3C DTCG format and tooling, scales as systems, component API design, headless/unstyled primitives, documentation as product, governance and versioning. Use when architecting a design system, structuring tokens, designing component APIs, choosing headless primitives, or setting up contribution/versioning.
tags	["design-systems","tokens","components","governance","headless","always-on"]

Design System Depth

A real design system is token architecture + component contracts + governance — not a Figma file of colors.

Three-Tier Token Architecture:
1. Primitive / Global — raw values (blue-500, space-4).
2. Semantic / Alias — intent-mapped (color-action-primary, space-inset-md).
3. Component-Specific — scoped (button-bg-hover). Components only ever consume semantic/component tiers, never primitives.
W3C DTCG Format & Tooling: Design Tokens Community Group spec; Style Dictionary and Tokens Studio transform one source into CSS / iOS / Android / JSON.
Scales as Systems: 4pt/8pt spacing grid, modular type scale (e.g. 1.25 ratio), constrained color ramps. Decisions become lookups.
Component API Design: Props as the contract; variants, sizes, and states as enumerable options; compound components and slots for composition; sensible defaults so the easy thing is the right thing.
Headless / Unstyled Primitives: Radix, React Aria, Ark — accessibility and behavior solved in the primitive, styling left to the system. The modern foundation.
Documentation as Product: Storybook for live docs; usage guidelines, do/don't, props tables treated as part of the deliverable.
Governance & Versioning: Contribution models, semver for breaking changes, deprecation paths, adoption metrics.

How to apply

Never let a component reference a primitive token directly — route through a semantic alias so theming works.
Build behavior/accessibility on a headless primitive, then layer system styling — don't re-solve focus traps and ARIA per component.
Treat the component API as the contract: enumerable variants/sizes/states, good defaults, composition via slots.
Ship docs and a versioning/deprecation policy with the system, or adoption stalls.