cybernetics/cssnano

cssnano is a modular CSS minifier built on top of the PostCSS ecosystem that performs advanced optimizations like custom identifier reduction, z-index rebasing, and adjacent selector merging. It's designed for web developers and build processes who want to optimize their CSS files beyond simple whitespace removal, particularly those already using PostCSS in their workflow. The tool is highly configurable and offers both aggressive and safe minification modes to suit different project needs.