Reticulas cssframework it´s write with both less and sass languages. There are many solutions to use it: lessphp, a compiler for less written in php, less.js as client-side (modern browsers only) ... As you can see, we use less as default language in the documentation.
If you prefer a basic template ready to work with reticulas-cssframework go to reticulas-template for more info.
variables.less or _variables.scss
Reticulas has a file with basic variables to configure basic appearance, if you want to change, should be redefined in your stylesheet.
Basic colors variables.
Basic baseline variable.
Basic grid configuration variables.