What problem does it solve? Teams building playful, Duolingo-inspired interfaces often lack consistent, documented design rules, leading to inconsistent spacing, colors, and inaccessible components. This Skill turns the Lingo design language into concrete, testable guidance that engineers and designers can apply directly. ## Core Features & Use Cases - Design Token Foundations: Provides the full Lingo palette (primary #58cc02, secondary #ce82ff, warning #ffc800, danger #ff4b4b), Nunito/JetBrains Mono typography scale, and 4/8/12/16/24/32 spacing scale. - Component-Level Rules: Defines anatomy, variants, states (default, hover, focus-visible, active, disabled, loading, error), and responsive behavior for UI components. - Accessibility & QA Gates: Enforces WCAG 2.2 AA requirements, testable acceptance criteria, anti-patterns, and a code-review-ready QA checklist. - Use Case: Ask for button guidelines and receive token-anchored rules covering tactile 3D bottom borders, focus states, keyboard interaction, and migration notes for inconsistent existing UI. ## Quick Start Use the lingo skill to write design-system guidelines for a primary button component including states, tokens, and accessibility criteria.