What problem does it solve? Developers often face blank-page paralysis and architectural decision fatigue when starting new web projects, leading to inconsistent CSS, conflicting styles, and poor responsive behavior. This Skill provides a complete technical foundation—design tokens, layout systems, and UX structure—before implementation begins. ## Core Features & Use Cases - CSS Design System Generation: Produces custom property-based token systems covering colors, typography scales, spacing, and container widths, with built-in light/dark/system theme support. - Layout Framework Specifications: Defines responsive container systems, Grid/Flexbox patterns, and component hierarchies with mobile-first breakpoints. - Theme Toggle Implementation: Delivers ready-to-use HTML, CSS, and JavaScript for a three-state (light/dark/system) theme switcher with localStorage persistence. - Use Case: A project manager hands off a site specification; the Skill converts it into a documented CSS architecture, information hierarchy, accessibility baseline, and a prioritized implementation guide ready for developers. ## Quick Start Ask the agent to create a technical architecture and UX foundation for your project based on your site specification document.