<===> input.scss
@import url(foo.css) only screen;
@import url(foo.css) (min-width:400px);
@import url(foo.css) (min-width:400px) and (max-width:599px);

<===> output.css
@import url(foo.css) only screen;
@import url(foo.css) (min-width: 400px);
@import url(foo.css) (min-width: 400px) and (max-width: 599px);