What problem does it solve? AI-generated interfaces often look generic, ignore accessibility requirements, and break on different screen sizes. This Skill guides the creation of production-quality user interfaces that follow real design systems, meet WCAG 2.1 AA accessibility standards, and handle loading, error, and empty states properly. ## Core Features & Use Cases - Component Architecture Guidance: Enforces composition over configuration, colocated file structures, and separation of data fetching from presentation in React/TypeScript components. - Accessibility Enforcement: Provides concrete patterns for keyboard navigation, ARIA labels, focus management, and meaningful empty/error states that meet WCAG 2.1 AA. - Design System Adherence: Identifies and eliminates common "AI aesthetic" anti-patterns (purple gradients, excessive rounding, stock card grids) in favor of consistent spacing scales, semantic color tokens, and type hierarchies. - Use Case: When asked to build a task list page, the Skill produces a responsive layout with skeleton loading states, optimistic updates via React Query, keyboard-accessible controls, and styling drawn from the project's design tokens rather than arbitrary values. ## Quick Start Ask the assistant to build a new UI component or page, such as a responsive task list with loading and empty states, and it will apply these frontend engineering standards automatically.