-form.filter fieldset.item input[value=CATEGORIES]:checked + label + input[type=text] { display: none; }
-form.filter fieldset.item input[value=CATEGORIES]:checked + label + input[type=text] + fieldset.categories { display: block; }
+form.filter fieldset.item input[value=course]:checked ~ input[type=text],
+form.filter fieldset.item input[value=CATEGORIES]:checked ~ input[type=text] { display: none; }
+form.filter fieldset.item input[value=course]:checked ~ fieldset.courses,
+form.filter fieldset.item input[value=CATEGORIES]:checked ~ fieldset.categories { display: block; }