Build-time helper functions
Tailwind exposes functions such as --alpha() and --spacing() for working with theme colors and spacing values inside CSS.
Why this is useful
These helpers connect custom CSS with the same design tokens used by utility classes, reducing duplication between markup and handwritten CSS.
Use modern CSS deliberately
Functions such as color-mix(), calc() and CSS custom properties are powerful, but they should still express a clear design requirement rather than make a simple utility unnecessarily complex.
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