Can't modify css styling with the Carrington Mobile Theme

Hello
I am currently working on adapting my website https://www.monparispascher.com to mobile phones. In order to achieve that, I am using a special theme for mobile users (carrington mobile). Besides,I use the atahualpa theme for desktop users.
I am currently trying to adjust styling but modifying my carrington mobile style.css file won’t result in any changes as far as styling. Paying a close look to the code in the header-default file of CM, I have noticed that much of the styling is actually coming from the /css/advanced.css file instead of the style.css file, which actually doesn’t seem to be triggered in my header file.
Consequently, I have tried to modified styling in the advanced.css file but nothing is happening. I still get the default styling coming with the carrington mobile theme.

In conclusion I would like to be able to edit all the css parameters mentionned in the advanced.css but I just have no clue how to do that…

For information, my stylesheet lines in the header are the following <style>
@import url(<?php echo trailingslashit(get_bloginfo(‘template_url’)).’/css/advanced.css’; ?>);

</style>

Thank you very much for your help !

Ma?l ??