diff --git a/src/offline.php b/src/offline.php
index 26706b9..1772b69 100644
--- a/src/offline.php
+++ b/src/offline.php
@@ -90,8 +90,13 @@ if ($params_developmentmode) {
 }
 $wa->useScript('user.js');
 
-// Bootstrap (accordion)
-HTMLHelper::_('bootstrap.loadCss', true, $doc);
+// Bootstrap CSS + JS (accordion, responsive grid, utilities)
+try {
+	$wa->useStyle('bootstrap.css');
+} catch (\Exception $e) {
+	// Fallback: load via HTMLHelper
+	HTMLHelper::_('bootstrap.loadCss', true, $doc);
+}
 HTMLHelper::_('bootstrap.framework');
 
 /* -----------------------