Tailwind CSS v4 skill for building utility-first, modern UIs. Covers the new CSS-first configuration with @theme design tokens, @import "tailwindcss" entry, @utility custom utilities, variants and stacked variants, responsive and dark-mode patterns, arbitrary values, and v3-to-v4 migration gotchas. Use when styling web UIs with Tailwind, configuring themes, adding custom utilities, handling responsive/dark/hover states, or migrating a v3 project to v4.
