What problem does it solve? Designing user-facing interfaces often leads to inconsistent interactions, hidden complexity, and accessibility gaps. This Skill provides enforceable UI/UX principles so interface decisions prioritize user tasks, clarity, and control over visual novelty. ## Core Features & Use Cases - Usability Heuristics: Applies Hick's Law, Fitts's Law, Miller's Law, and Gestalt principles to reduce decision cost and cognitive load. - Interaction Consistency: Enforces interaction invariants, system legibility, task continuity, and reversibility across the product. - Accessibility & Responsiveness: Treats accessibility as an architectural constraint and preserves task priority across viewports and input methods. - Use Case: When building a multi-step checkout flow, use this Skill to structure navigation around user decisions, preserve entered data across steps, and keep destructive actions separated yet recoverable. ## Quick Start Review my checkout flow design and apply UI/UX principles to improve usability, accessibility, and interaction consistency.