How can I create a child theme for minimatica?

I’ve tried to make a child theme for minimatica. I followed the instructions on http://codex.wordpress.org/Child_Themes.
I’ve created a new folder in /wp-content/themes/ named ‘minimatica child’ and included one style.css with this:
/*
Theme Name: minimatica child
Author: Bärbel Tomasi
Template: minimatica
*/
@import: ../minimatica/style.css;

This does not work, there are no styles at all after I activate the child theme.

How can I make this work?

Thank you!

Bärbel