Reference for Tailwind CSS v4 syntax and the differences from v3.x. Use when configuring Tailwind (CSS-first @theme config, @import "tailwindcss"), using new v4 features (container queries, 3D transforms, gradients, composable variants, @utility/@variant/@plugin), or migrating v3 patterns. This repo is on v4 — do NOT emit v3 syntax like tailwind.config.js, @tailwind directives, or bg-gradient-*.
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