LESS: generate different CSSs for different theme (color variation)

Question

I would like to manage creation of different \"theme\" for my site, using LESS.

My idea is to generate different compiled .css files, using each time a specific variable

Answer 1

You need to flip your import directions.

The style.less file should not import any variables.

Instead, each variableN.less file should import style.less after defining all of its variables.
These files will then each compile to a full set of rules based on their variable values.