From ae071ad7f6e133a1c41cd30f97b506c7d6d0e31c Mon Sep 17 00:00:00 2001
From: i-just <iwona@pixelandtonic.com>
Date: Mon, 16 Mar 2026 10:31:49 +0100
Subject: [PATCH 1/4] register import css statements without the namespace

---
 src/Field.php | 12 +++++++++++-
 1 file changed, 11 insertions(+), 1 deletion(-)

diff --git a/src/Field.php b/src/Field.php
index 1d516d5..740e6e2 100644
--- a/src/Field.php
+++ b/src/Field.php
@@ -1573,7 +1573,17 @@ private function _inputHtml(mixed $value, ?ElementInterface $element, bool $stat
         }
 
         if ($this->css) {
-            $view->registerCss("#{$view->namespaceInputId($inputId)} { $this->css }");
+            preg_match_all('/@import .+;/', $this->css, $importStatements);
+            if (count($importStatements[0]) > 0) {
+                foreach ($importStatements[0] as $importStatement) {
+                    str_replace($importStatement, '', $this->css);
+                    $view->registerCss("$importStatement");
+                }
+            }
+            $this->css = trim($this->css);
+            if (!empty($this->css)) {
+                $view->registerCss("#{$view->namespaceInputId($inputId)} { $this->css }");
+            }
         }
 
         return Html::tag('div', $html, [

From 2329ba305e07a15a922dd358830f4e41862bcae4 Mon Sep 17 00:00:00 2001
From: i-just <iwona@pixelandtonic.com>
Date: Tue, 17 Mar 2026 16:10:43 +0100
Subject: [PATCH 2/4] tweaks

---
 src/Field.php | 4 ++--
 1 file changed, 2 insertions(+), 2 deletions(-)

diff --git a/src/Field.php b/src/Field.php
index 740e6e2..c23ad97 100644
--- a/src/Field.php
+++ b/src/Field.php
@@ -1576,8 +1576,8 @@ private function _inputHtml(mixed $value, ?ElementInterface $element, bool $stat
             preg_match_all('/@import .+;/', $this->css, $importStatements);
             if (count($importStatements[0]) > 0) {
                 foreach ($importStatements[0] as $importStatement) {
-                    str_replace($importStatement, '', $this->css);
-                    $view->registerCss("$importStatement");
+                    $this->css = str_replace($importStatement, '', $this->css);
+                    $view->registerCss($importStatement);
                 }
             }
             $this->css = trim($this->css);

From a930ad28b6c99a88181308e631c272c30d16334a Mon Sep 17 00:00:00 2001
From: brandonkelly <brandon@pixelandtonic.com>
Date: Tue, 17 Mar 2026 14:50:11 -0700
Subject: [PATCH 3/4] Cleanup

---
 src/Field.php | 21 ++++++++++++---------
 1 file changed, 12 insertions(+), 9 deletions(-)

diff --git a/src/Field.php b/src/Field.php
index c23ad97..1297e89 100644
--- a/src/Field.php
+++ b/src/Field.php
@@ -1573,16 +1573,19 @@ private function _inputHtml(mixed $value, ?ElementInterface $element, bool $stat
         }
 
         if ($this->css) {
-            preg_match_all('/@import .+;/', $this->css, $importStatements);
-            if (count($importStatements[0]) > 0) {
-                foreach ($importStatements[0] as $importStatement) {
-                    $this->css = str_replace($importStatement, '', $this->css);
-                    $view->registerCss($importStatement);
-                }
+            $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));
             }
-            $this->css = trim($this->css);
-            if (!empty($this->css)) {
-                $view->registerCss("#{$view->namespaceInputId($inputId)} { $this->css }");
+            $css = trim($css);
+            if ($css !== '') {
+                $view->registerCss("#{$view->namespaceInputId($inputId)} { $css }");
             }
         }
 

From 1992fbb0d247e43c04097e14b3b236853656295a Mon Sep 17 00:00:00 2001
From: brandonkelly <brandon@pixelandtonic.com>
Date: Tue, 17 Mar 2026 14:51:45 -0700
Subject: [PATCH 4/4] Release note

---
 CHANGELOG.md | 4 ++++
 1 file changed, 4 insertions(+)

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))