@variables {
    c1: "c1 imported";
    c2: "c2 imported (SHOULD BE OVERWRITTEN)";
    }
    
.import1 {
    content: var(c1);
    }
.import2 {
    content: var(c2);
    }
.import3 {
    /* not defined here! */
    content: var(c3);
    }