Cant hide/outcomment @import in stylesheet.css

Trying to hide/outcomment a @import rule in the stylesheet.css wont work, the outcomment @import rule will be generated and read by safari.

ataching stylesheets used to test
stylesheet.css
lightcolours.css

Output style.php gives the following code:
/* /* lightcolours
---------------------------------------- */
.copyright, .copyright a

.copyright a:hover

Enable lightcolours.css stylesheet import for alternativ light version */