Pretty nice. But I think it needs better generality in values – more references to other variables, and color functions. If I make my primary brand color the light yellow #faf332 and the link color a very dark yellow, there are a lot of places on the page that still have unreadable white text on a yellow background, such as @btn-primary-color (which I set to #111) and @pagination-active-color (which I set to @link-color). Those values should use some function of @link-color or another variable as their default value. And colors should use appropriate functions to choose a light or dark color that maximizes contrast against their background.