Design Problems after creating Child Theme

Hi, I recently started to build a wordpress page (http://www.bilingual-ballet.com/) and just created a child theme today.
My problem now is, that most of the original Twenty Thirteen template design changed (got formated).

e.g. heading, text, menu bar etc disappeared to the left, colors are different, title image changed to default image again,..

I tried to help myself and searched the web many hours for a solution, but I couldnt find one.

Does anybody have an idea, what could have gone wrong?
Thanks in advance!

This is the created style.css:

/*
Theme Name: Twenty Thirteen Child
Template: twentythirteen
*/

@import url(“../twentythirteen/style.css”);