diff --git a/CHANGELOG.md b/CHANGELOG.md
index fa81219..4c76ae0 100644
--- a/CHANGELOG.md
+++ b/CHANGELOG.md
@@ -1,5 +1,9 @@
 # Release Notes for CKEditor for Craft CMS
 
+## Unreleased
+
+- Fixed a bug where `@import` statements within custom styles weren’t working. ([#538](https://github.com/craftcms/ckeditor/pull/538))
+
 ## 5.2.0 - 2026-03-12
 
 - It’s now possible to drag-and-drop images into fields with the “Nested entries” image mode, if the “Add nested content” button is present, but not “Insert image”. ([#524](https://github.com/craftcms/ckeditor/issues/524))
diff --git a/src/Field.php b/src/Field.php
index 1d516d5..1297e89 100644
--- a/src/Field.php
+++ b/src/Field.php
@@ -1573,7 +1573,20 @@ private function _inputHtml(mixed $value, ?ElementInterface $element, bool $stat
         }
 
         if ($this->css) {
-            $view->registerCss("#{$view->namespaceInputId($inputId)} { $this->css }");
+            $css = $this->css;
+            $imports = [];
+            preg_match_all('/@import .+;?/m', $css, $importMatches);
+            for ($i = 0; $i < count($importMatches[0]); $i++) {
+                $imports[] = $importMatches[0][$i];
+                $css = str_replace($importMatches[0][$i], '', $css);
+            }
+            if (!empty($imports)) {
+                $view->registerCss(implode("\n", $imports));
+            }
+            $css = trim($css);
+            if ($css !== '') {
+                $view->registerCss("#{$view->namespaceInputId($inputId)} { $css }");
+            }
         }
 
         return Html::tag('div', $html, [