What problem does it solve? It provides a structured reference for applying Tailwind CSS v4 correctly, covering the migration from v3 config files to CSS-first @theme configuration, container queries, dark mode, and modern layout patterns so developers avoid outdated v3 habits and anti-patterns. ## Core Features & Use Cases - CSS-First Configuration: Defines design tokens with the @theme directive, including OKLCH colors, spacing scales, and typography stacks. - Container Queries & Responsive Design: Explains when to use @container breakpoints versus viewport breakpoints for component-level responsiveness. - Layout & Anti-Pattern Guidance: Documents flexbox, grid, and Bento layout patterns plus a list of anti-patterns to avoid, such as arbitrary values and heavy @apply usage. - Use Case: When building a responsive card component in a Next.js project, use this Skill to apply container queries, semantic color tokens, and dark mode variants following v4 conventions. ## Quick Start Ask the AI to style a responsive card component using Tailwind CSS v4 patterns with container queries and dark mode support.