Tailwind V4 Shadcn

This is the setup guide you want bookmarked if you're using Tailwind v4 with shadcn/ui. It's production tested and built around the four-step architecture pattern that actually works: CSS variables at root, theme inline mappings, base layer styles, automatic dark mode. The author documents real results (70% token reduction, zero errors vs the usual 2-3 gotchas) and calls out the specific mistakes that break v4 projects, like putting root variables inside layer base or double-wrapping hsl values. Includes working templates for ThemeProvider, complete dependency lists, and a troubleshooting section for the plugin syntax issues that trip people up. Worth using just to avoid the tw-animate-css import error alone.