diff --git a/mandelstudio/templates/engine/partials/basic.html b/mandelstudio/templates/engine/partials/basic.html
index 3bd86eb..7900826 100644
--- a/mandelstudio/templates/engine/partials/basic.html
+++ b/mandelstudio/templates/engine/partials/basic.html
@@ -1 +1 @@
-{% include "carbasa/headers/header.html" %}
+{% include "oxyan/headers/mega.html" %}
diff --git a/mandelstudio/templates/engine/partials/header.html b/mandelstudio/templates/engine/partials/header.html
index 8e9cae8..8751fd7 100644
--- a/mandelstudio/templates/engine/partials/header.html
+++ b/mandelstudio/templates/engine/partials/header.html
@@ -3,4 +3,4 @@ Project-level header override:
 force engine pages to render the Carbasa header instead of
 the template_engine fallback header.
 {% endcomment %}
-{% include "carbasa/headers/header.html" %}
+{% include "oxyan/headers/mega.html" %}
diff --git a/mandelstudio/templates/engine/partials/header5.html b/mandelstudio/templates/engine/partials/header5.html
index 3bd86eb..7900826 100644
--- a/mandelstudio/templates/engine/partials/header5.html
+++ b/mandelstudio/templates/engine/partials/header5.html
@@ -1 +1 @@
-{% include "carbasa/headers/header.html" %}
+{% include "oxyan/headers/mega.html" %}
diff --git a/mandelstudio/templates/engine/partials/mega.html b/mandelstudio/templates/engine/partials/mega.html
index 3bd86eb..7900826 100644
--- a/mandelstudio/templates/engine/partials/mega.html
+++ b/mandelstudio/templates/engine/partials/mega.html
@@ -1 +1 @@
-{% include "carbasa/headers/header.html" %}
+{% include "oxyan/headers/mega.html" %}
diff --git a/mandelstudio/templates/layout.html b/mandelstudio/templates/layout.html
index ef06c17..f50d609 100644
--- a/mandelstudio/templates/layout.html
+++ b/mandelstudio/templates/layout.html
@@ -11,6 +11,12 @@
 {% block title %}{% firstof page.seo_title self.seo_title page.title self.title shop_name %}{% endblock %}
 {% block description %}{% firstof page.search_description self.search_description "" %}{% endblock %}
 
+{% block base_css %}
+{{ block.super }}
+{# Ensure Carbasa webshop styling is present so responsive header/footer render correctly. #}
+<link rel="stylesheet" type="text/x-scss" href="{% static 'carbasa/webshop_base.scss' %}">
+{% endblock %}
+
 {% block extrahead %}
 {% if cookie_jar.settings.google_tag_manager and cookie_jar.functional.is_allowed %}
 <link rel="preconnect" href="https://www.googletagmanager.com"/>
@@ -33,7 +39,7 @@
 {% endif %}
 
 {% block navbar %}
-    {% include "carbasa/headers/header.html" %}
+    {% include "oxyan/headers/mega.html" %}
 {% endblock %}
 
 {% block content_wrapper %}