Less files under /templates - as well under ../plugins/system/t3/base/less..

I am wondering, I am trying to arrange some parameters, but I found several places for the .LESS files.

I was searching changing parameters for:
@T3globalMargin
@T3globalPadding

But I may not find the "general" main file, where I can adjust these global parameters, also under ../plugins/system/t3/base/less I am finding files.

Sorry but short introduction page (here) does not cover all T3V3 parameters , where to find, where do adjust .....

Anyone here who can explain me where I can change main parameters ?<br />
<br />
Thks