What problem does it solve? Design systems often grow into inconsistent, hard-to-theme CSS where colors and spacing are scattered across components. This Skill provides reference documentation for a three-layer token architecture (primitive, semantic, component) that keeps design values organized, themeable, and consistent. ## Core Features & Use Cases - Token Architecture Reference: Explains the primitive, semantic, and component token layers with naming conventions and file organization patterns. - Concrete Token Definitions: Provides ready-to-adapt CSS variable sets for colors, spacing, typography, radius, shadows, motion, and z-index, plus component tokens for buttons, inputs, cards, and dialogs. - States & Accessibility Guidance: Documents hover, focus, disabled, loading, and error state patterns with contrast and ARIA requirements. - Use Case: When adding a new button variant to a Tailwind CSS 4 project, consult the component tokens and states references to define --button-* variables that reference semantic tokens instead of hardcoding primitive values. ## Quick Start Ask the AI to explain how to add a new component token to the design system following the three-layer token architecture in src/styles/theme.css.