Advanced
Build optimization
Keeping your CSS small.
Only what's used
Output scales with the number of distinct expressions you use, not with the size of the framework. A stylesheet with 500 distinct expressions has about 500 rules, however many pages use them.
Theme variables
The default variables: "used" emits only the tokens in use. The size of your theme doesn't affect output, unless you set "all".
Reuse
Repeating an expression costs nothing, while a bracket value used once adds a rule. Prefer tokens and you'll tend to reuse more.
Narrow your content patterns
Patterns that match less scan faster and avoid false positives. Don't point content at large generated files.
Compression
Class names are longer than hashes, so uncompressed CSS and HTML are larger than a hashing approach would produce. Repetitive text compresses well, so serve your assets with gzip or Brotli.
CI
croff check --strict catches invalid expressions and runtime-built classes before they reach a build.