CSS implementation patterns for layout, typography, color, spacing, and responsive design. Complements ui-design (fundamentals) with code-focused examples.
**Summary: Major rewrite with expanded CSS patterns, practical guidance, and production-focused examples.** - Rebuilt documentation to provide actionable, code-first patterns for layout, typography, color, spacing, and responsive design. - Added detailed grids and tables mapping interface needs to recommended CSS tools and code snippets. - Expanded sections on spacing tokens, color palette structure, visual hierarchy, and accessibility best practices. - Included responsive fluid techniques, practical examples, and accessibility code that meets modern standards. - Clarified relationships with related skills: ui-design, frontend-design, and design-system-patterns.