SCSS variable substitution does not work in base/base

[MarauderXtreme]

I define in assets/stylesheets/base/base various CSS var declaration to ease later light theme integration (relates #5).
To make it easier to develop I tried to parametrise these declarations with SCSS variables for various colours.
Unfortunately those do not get translated but rather put 1:1 into the resulting CSS.

This behaviour seems odd whereas every other stylesheet gets treated as expected.
It either relates to CSS var declarations being handled differently by SCSS or the :root selector is not recognised.

This needs further investigation.

[MarauderXtreme]

This apparently includes all processing.
I tried to use asset_url() from jekyll-assets but it just prints it literally.
I have the suspicion that this either comes from a mishandling in jekyll-assets or sprockets.

[MarauderXtreme]

Removing this for now from public release milestone as it seems not fixable given the current state of jekyll-assets.