Tailwind CSS v4.0 Released: Lightning-Fast Builds, Advanced Features, and Simplified Setup : fireup.pro

Tailwind CSS v4.0 was released on January 22, 2025, bringing major performance improvements (5x faster full builds, 8x faster incremental builds), a simplified one-line CSS import setup, and CSS-first configuration replacing tailwind.config.js. The release leverages modern CSS features including native cascade layers, registered custom properties, color-mix(), and logical properties. New utilities include container queries, 3D transforms, expanded gradient APIs, and more. Lightning CSS now powers the build pipeline under the hood.