Matter UI Skills Opinionated constraints for building Matter-style interfaces with AI agents. When to Apply Reference these guidelines when: - Building dark-mode interfaces - Creating Matter-inspired design systems - Implementing UIs with Inter font and 4px grid Colors - MUST use dark backgrounds (lightness < 20) for primary surfaces - detected lightness: 0 - MUST use as page background ( ) - MUST use for primary actions and focus states ( ) - SHOULD reduce color palette (currently 19 colors detected) - MUST maintain text contrast ratio of at least 4.5:1 for accessibility Semantic Tokens | To…