Wro4j's RubySassCss plugin doesn't recognize sass variables

Question

I am using RubySassCss to compile my sass files that looks like this:

styles.scss :

body{
  &.template1{
     $background-color: #fff;

     @import "_template.scss";
  }
  &.template2{
     $background-color: #000;

     @import "_template.scss";
  }
}

_template.scss:

div{
  background-color: $background-color;
}

But i get this error :

Sass::SyntaxError: Undefined variable: "$background-color".

What i was trying to do here is a templating system based on sass variables, so if i change the body className the template (css values) changes too.

---

UPDATE :

When i replace @import "_template.scss"; with the content of my _template file the code works like a charm, but my real _template file is too long and i have many templates and a lot of vars, so i can't use this workaround.