What problem does it solve? It bridges the gap between interaction design and technical implementation by turning requirements or interaction documents into concrete visual design specifications (layout, components, color, typography, spacing tokens) plus runnable HTML demos, eliminating vague handoffs between design and engineering. ## Core Features & Use Cases - Visual Scheme Documents: Produces layout scheme docs covering page structure, grid, component states, color/typography/spacing/radius/shadow design tokens, and responsive rules, saved to docs/ui-design/. - Zero-Build HTML Demos: Writes single-file HTML/CSS/vanilla-JS prototypes that open directly in a browser, with CSS variables matching the design tokens one-to-one. - Style Tool Integration: Detects and loads external style skill libraries (taste-skill, frontend-design, theme-factory) from ui-tools/skills/ to match design scenarios like minimalist, high-end, or brutalist styles. - Use Case: After interaction-design finishes a login flow, ask for the UI design and receive a confirmed layout scheme document plus a previewable demo/login-page/index.html showing default, error, and loading states. ## Quick Start Ask the AI to design the UI for your feature or page based on your requirement description or interaction design document, then confirm each stage until the HTML demo is generated.