Seeking Documentation for Relume Variables and Custom Code

I have had relume for 1170 days and it is amazing. Recently I am trying to use variables more in a starter template that I have that I use as a starting point when creating a new site. My question for the group is if there is more robust documentation related to the variables that come with the Relume clone site and the newer custom code related to color scheme? I want to make sure I am not breaking relume functionality while adding more variable options in my own template. For example I want to add more background variables etc. Any resources on understanding the code and its relationship to variables would be great. Thanks!