diff --git a/public/main/inc/lib/api.lib.php b/public/main/inc/lib/api.lib.php
index 875f7ec5a5d..42419de107a 100644
--- a/public/main/inc/lib/api.lib.php
+++ b/public/main/inc/lib/api.lib.php
@@ -12,6 +12,7 @@
 use Chamilo\CoreBundle\Exception\NotAllowedException;
 use Chamilo\CoreBundle\Framework\Container;
 use Chamilo\CoreBundle\ServiceHelper\MailHelper;
+use Chamilo\CoreBundle\ServiceHelper\ThemeHelper;
 use Chamilo\CourseBundle\Entity\CGroup;
 use Chamilo\CourseBundle\Entity\CLp;
 use ChamiloSession as Session;
@@ -3730,83 +3731,13 @@ function api_get_language_from_iso($code)
 }
 
 /**
- * Returns the name of the visual (CSS) theme to be applied on the current page.
- * The returned name depends on the platform, course or user -wide settings.
- *
- * @return string The visual theme's name, it is the name of a folder inside web/css/themes
+ * Shortcut to ThemeHelper::getVisualTheme()
  */
-function api_get_visual_theme()
+function api_get_visual_theme(): string
 {
-    static $visual_theme;
-    if (!isset($visual_theme)) {
-        // Get style directly from DB
-        /*$styleFromDatabase = api_get_settings_params_simple(
-            [
-                'variable = ? AND access_url = ?' => [
-                    'stylesheets',
-                    api_get_current_access_url_id(),
-                ],
-            ]
-        );
-
-        if ($styleFromDatabase) {
-            $platform_theme = $styleFromDatabase['selected_value'];
-        } else {
-            $platform_theme = api_get_setting('stylesheets');
-        }*/
-        $platform_theme = api_get_setting('stylesheets');
-
-        // Platform's theme.
-        $visual_theme = $platform_theme;
-        if ('true' == api_get_setting('user_selected_theme')) {
-            $user_info = api_get_user_info();
-            if (isset($user_info['theme'])) {
-                $user_theme = $user_info['theme'];
-
-                if (!empty($user_theme)) {
-                    $visual_theme = $user_theme;
-                    // User's theme.
-                }
-            }
-        }
-
-        $course_id = api_get_course_id();
-        if (!empty($course_id)) {
-            if ('true' == api_get_setting('allow_course_theme')) {
-                $course_theme = api_get_course_setting('course_theme', $course_id);
-
-                if (!empty($course_theme) && -1 != $course_theme) {
-                    if (!empty($course_theme)) {
-                        // Course's theme.
-                        $visual_theme = $course_theme;
-                    }
-                }
-
-                $allow_lp_theme = api_get_course_setting('allow_learning_path_theme');
-                if (1 == $allow_lp_theme) {
-                    /*global $lp_theme_css, $lp_theme_config;
-                    // These variables come from the file lp_controller.php.
-                    if (!$lp_theme_config) {
-                        if (!empty($lp_theme_css)) {
-                            // LP's theme.
-                            $visual_theme = $lp_theme_css;
-                        }
-                    }*/
-                }
-            }
-        }
-
-        if (empty($visual_theme)) {
-            $visual_theme = 'chamilo';
-        }
-
-        /*global $lp_theme_log;
-        if ($lp_theme_log) {
-            $visual_theme = $platform_theme;
-        }*/
-    }
+    $themeHelper = Container::$container->get(ThemeHelper::class);
 
-    return $visual_theme;
+    return $themeHelper->getVisualTheme();
 }
 
 /**
diff --git a/public/main/inc/lib/display.lib.php b/public/main/inc/lib/display.lib.php
index 148e639ea2c..4207fc18a59 100644
--- a/public/main/inc/lib/display.lib.php
+++ b/public/main/inc/lib/display.lib.php
@@ -10,6 +10,7 @@
 use Chamilo\CoreBundle\Entity\ExtraFieldValues;
 use Chamilo\CoreBundle\Framework\Container;
 use Chamilo\CoreBundle\Repository\ColorThemeRepository;
+use Chamilo\CoreBundle\ServiceHelper\AccessUrlHelper;
 use ChamiloSession as Session;
 use Symfony\Component\HttpFoundation\Response;
 
@@ -2672,15 +2673,14 @@ public static function getFrameReadyBlock(
             return false;
         }
 
-        $colorThemeRepo = Container::$container->get(ColorThemeRepository::class);
+        $accessUrlHelper = Container::$container->get(AccessUrlHelper::class);
         $router = Container::getRouter();
 
-        $colorTheme = $colorThemeRepo->getActiveOne();
-        $colorThemeItem = '';
+        $urlRelColorTheme = $accessUrlHelper->getCurrent()->getActiveColorTheme();
 
-        if ($colorTheme) {
-            $colorThemeItem = '{ type: "stylesheet", src: "'.$router->generate('chamilo_color_theme').'" },';
-        }
+        $colorThemeItem = $urlRelColorTheme
+            ? '{ type: "stylesheet", src: "'.$router->generate('chamilo_color_theme').'" },'
+            : '';
 
         return '$.frameReady(function() {},
             "'.$frameName.'",
diff --git a/src/CoreBundle/EventListener/TwigListener.php b/src/CoreBundle/EventListener/TwigListener.php
index 55ff5cf8c69..ba5637c1630 100644
--- a/src/CoreBundle/EventListener/TwigListener.php
+++ b/src/CoreBundle/EventListener/TwigListener.php
@@ -6,8 +6,8 @@
 
 namespace Chamilo\CoreBundle\EventListener;
 
-use Chamilo\CoreBundle\Repository\ColorThemeRepository;
 use Chamilo\CoreBundle\Repository\LanguageRepository;
+use Chamilo\CoreBundle\ServiceHelper\AccessUrlHelper;
 use Symfony\Component\HttpKernel\Event\ControllerEvent;
 use Symfony\Component\Routing\RouterInterface;
 use Symfony\Component\Security\Core\Authentication\Token\Storage\TokenStorageInterface;
@@ -25,7 +25,7 @@ public function __construct(
         private readonly SerializerInterface $serializer,
         private readonly TokenStorageInterface $tokenStorage,
         private readonly LanguageRepository $languageRepository,
-        private readonly ColorThemeRepository $colorThemeRepository,
+        private readonly AccessUrlHelper $accessUrlHelper,
         private readonly RouterInterface $router,
     ) {}
 
@@ -62,9 +62,10 @@ private function loadColorTheme(): void
     {
         $link = null;
 
-        $colorTheme = $this->colorThemeRepository->getActiveOne();
+        $accessUrl = $this->accessUrlHelper->getCurrent();
+        $urlRelColorTheme = $accessUrl->getActiveColorTheme();
 
-        if ($colorTheme) {
+        if ($urlRelColorTheme) {
             $path = $this->router->generate('chamilo_color_theme');
 
             $link = '<link rel="stylesheet" href="'.$path.'">';
diff --git a/src/CoreBundle/ServiceHelper/MailHelper.php b/src/CoreBundle/ServiceHelper/MailHelper.php
index 520c9c2c57b..8ff3c5f53f6 100644
--- a/src/CoreBundle/ServiceHelper/MailHelper.php
+++ b/src/CoreBundle/ServiceHelper/MailHelper.php
@@ -19,6 +19,7 @@ final class MailHelper
     public function __construct(
         private readonly MailerInterface $mailer,
         private readonly BodyRendererInterface $bodyRenderer,
+        private readonly ThemeHelper $themeHelper,
     ) {}
 
     public function send(
@@ -98,7 +99,7 @@ public function send(
                 'link' => $additionalParameters['link'] ?? '',
                 'automatic_email_text' => $automaticEmailText,
                 'content' => $body,
-                'theme' => api_get_visual_theme(),
+                'theme' => $this->themeHelper->getVisualTheme(),
             ];
 
             if (!empty($recipientEmail)) {
diff --git a/src/CoreBundle/ServiceHelper/ThemeHelper.php b/src/CoreBundle/ServiceHelper/ThemeHelper.php
new file mode 100644
index 00000000000..4cdd9dab7be
--- /dev/null
+++ b/src/CoreBundle/ServiceHelper/ThemeHelper.php
@@ -0,0 +1,66 @@
+<?php
+
+/* For licensing terms, see /license.txt */
+
+declare(strict_types=1);
+
+namespace Chamilo\CoreBundle\ServiceHelper;
+
+use Chamilo\CoreBundle\Settings\SettingsManager;
+use Chamilo\CourseBundle\Settings\SettingsCourseManager;
+
+final class ThemeHelper
+{
+    public const DEFAULT_THEME = 'chamilo';
+
+    public function __construct(
+        private readonly AccessUrlHelper $accessUrlHelper,
+        private readonly SettingsManager $settingsManager,
+        private readonly UserHelper $userHelper,
+        private readonly CidReqHelper $cidReqHelper,
+        private readonly SettingsCourseManager $settingsCourseManager,
+    ) {}
+
+    /**
+     * Returns the name of the color theme configured to be applied on the current page.
+     * The returned name depends on the platform, course or user settings.
+     */
+    public function getVisualTheme(): string
+    {
+        static $visualTheme;
+
+        if (isset($visualTheme)) {
+            return $visualTheme;
+        }
+
+        $accessUrl = $this->accessUrlHelper->getCurrent();
+
+        $visualTheme = $accessUrl->getActiveColorTheme()?->getColorTheme()->getSlug();
+
+        if ('true' == $this->settingsManager->getSetting('profile.user_selected_theme')) {
+            $visualTheme = $this->userHelper->getCurrent()?->getTheme();
+        }
+
+        if ('true' == $this->settingsManager->getSetting('course.allow_course_theme')) {
+            $course = $this->cidReqHelper->getCourseEntity();
+
+            if ($course) {
+                $this->settingsCourseManager->setCourse($course);
+
+                $visualTheme = $this->settingsCourseManager->getSetting('course_theme');
+
+                if (1 === (int) $this->settingsCourseManager->getSetting('allow_learning_path_theme')) {
+                    global $lp_theme_css;
+
+                    $visualTheme = $lp_theme_css;
+                }
+            }
+        }
+
+        if (empty($visualTheme)) {
+            return self::DEFAULT_THEME;
+        }
+
+        return $visualTheme;
+    }
+}