diff --git a/src/Resources/contao/dca/tl_settings.php b/src/Resources/contao/dca/tl_settings.php
index 1bde23e..3b053a4 100644
--- a/src/Resources/contao/dca/tl_settings.php
+++ b/src/Resources/contao/dca/tl_settings.php
@@ -4,14 +4,17 @@ use Contao\CoreBundle\DataContainer\PaletteManipulator;
 use Contao\System;
 
 /**
+ * -------------------------------------------------
  * Fields
+ * -------------------------------------------------
  */
+
 $GLOBALS['TL_DCA']['tl_settings']['fields']['meilisearch_host'] = [
     'inputType' => 'text',
     'eval' => [
         'mandatory' => true,
-        'rgxp' => 'url',
-        'tl_class' => 'w50',
+        'rgxp'      => 'url',
+        'tl_class'  => 'w50',
     ],
 ];
 
@@ -19,7 +22,7 @@ $GLOBALS['TL_DCA']['tl_settings']['fields']['meilisearch_index'] = [
     'inputType' => 'text',
     'eval' => [
         'mandatory' => true,
-        'tl_class' => 'w50',
+        'tl_class'  => 'w50',
     ],
 ];
 
@@ -27,7 +30,7 @@ $GLOBALS['TL_DCA']['tl_settings']['fields']['meilisearch_api_write'] = [
     'inputType' => 'text',
     'eval' => [
         'mandatory' => true,
-        'tl_class' => 'w50',
+        'tl_class'  => 'w50',
         'hideInput' => true,
     ],
 ];
@@ -36,7 +39,7 @@ $GLOBALS['TL_DCA']['tl_settings']['fields']['meilisearch_api_search'] = [
     'inputType' => 'text',
     'eval' => [
         'mandatory' => true,
-        'tl_class' => 'w50',
+        'tl_class'  => 'w50',
         'hideInput' => true,
     ],
 ];
@@ -55,50 +58,88 @@ $GLOBALS['TL_DCA']['tl_settings']['fields']['meilisearch_imagesize'] = [
         return $options;
     },
     'eval' => [
-        'tl_class' => 'w50',
-        'chosen' => true,
-        'includeBlankOption' => true,
+        'tl_class'            => 'w50',
+        'chosen'              => true,
+        'includeBlankOption'  => true,
     ],
-    // 🔥 DAS HAT GEFEHLT
     'sql' => "int(10) unsigned NOT NULL default 0",
 ];
 
-$GLOBALS['TL_DCA']['tl_settings']['fields']['meilisearch_index_past_events'] = [
-    'inputType' => 'checkbox',
-    'eval'      => [
-        'tl_class' => 'w50 clr',
-    ],
-];
-
 $GLOBALS['TL_DCA']['tl_settings']['fields']['meilisearch_fallback_image'] = [
     'inputType' => 'fileTree',
     'eval' => [
         'filesOnly' => true,
         'fieldType' => 'radio',
-        'tl_class' => 'w50',
+        'tl_class'  => 'w50',
     ],
     'sql' => "varbinary(16) NULL",
 ];
 
+$GLOBALS['TL_DCA']['tl_settings']['fields']['meilisearch_index_past_events'] = [
+    'inputType' => 'checkbox',
+    'eval' => [
+        'tl_class' => 'w50 clr',
+    ],
+];
+
+/**
+ * PDF / Office Indexierung
+ */
+
 $GLOBALS['TL_DCA']['tl_settings']['fields']['meilisearch_index_pdfs'] = [
     'label'     => &$GLOBALS['TL_LANG']['tl_settings']['meilisearch_index_pdfs'],
     'inputType' => 'checkbox',
-    'eval'      => [
-        'tl_class' => 'w50',
+    'eval' => [
+        'tl_class'       => 'w50',
+        'submitOnChange' => true,
     ],
-    'sql'       => "char(1) NOT NULL default '1'",
+    'sql' => "char(1) NOT NULL default '1'",
 ];
 
 $GLOBALS['TL_DCA']['tl_settings']['fields']['meilisearch_index_office'] = [
     'label'     => &$GLOBALS['TL_LANG']['tl_settings']['meilisearch_index_office'],
     'inputType' => 'checkbox',
-    'eval'      => ['tl_class' => 'w50'],
-    'sql'       => "char(1) NOT NULL default '0'",
+    'eval' => [
+        'tl_class'       => 'w50',
+        'submitOnChange' => true,
+    ],
+    'sql' => "char(1) NOT NULL default '0'",
 ];
 
 /**
- * Palette
+ * Tika URL (nur sichtbar wenn PDFs oder Office aktiv)
  */
+
+$GLOBALS['TL_DCA']['tl_settings']['fields']['meilisearch_tika_url'] = [
+    'inputType' => 'text',
+    'eval' => [
+        'rgxp'      => 'url',
+        'mandatory' => true,
+        'tl_class'  => 'w50 clr',
+    ],
+];
+
+/**
+ * -------------------------------------------------
+ * Selector / Subpalettes
+ * -------------------------------------------------
+ */
+
+$GLOBALS['TL_DCA']['tl_settings']['palettes']['__selector__'][] = 'meilisearch_index_pdfs';
+$GLOBALS['TL_DCA']['tl_settings']['palettes']['__selector__'][] = 'meilisearch_index_office';
+
+$GLOBALS['TL_DCA']['tl_settings']['subpalettes']['meilisearch_index_pdfs']
+    = 'meilisearch_tika_url';
+
+$GLOBALS['TL_DCA']['tl_settings']['subpalettes']['meilisearch_index_office']
+    = 'meilisearch_tika_url';
+
+/**
+ * -------------------------------------------------
+ * Palette
+ * -------------------------------------------------
+ */
+
 PaletteManipulator::create()
     ->addLegend('meilisearch_legend', null, PaletteManipulator::POSITION_AFTER, true)
     ->addField('meilisearch_host', 'meilisearch_legend')
@@ -110,4 +151,22 @@ PaletteManipulator::create()
     ->addField('meilisearch_index_past_events', 'meilisearch_legend')
     ->addField('meilisearch_index_pdfs', 'meilisearch_legend')
     ->addField('meilisearch_index_office', 'meilisearch_legend')
-    ->applyToPalette('default', 'tl_settings');
\ No newline at end of file
+    ->applyToPalette('default', 'tl_settings');
+
+/**
+ * -------------------------------------------------
+ * Optional: Absicherung beim Speichern
+ * -------------------------------------------------
+ */
+
+$GLOBALS['TL_DCA']['tl_settings']['config']['onsubmit_callback'][] = static function () {
+    $indexPdf    = (bool) \Contao\Config::get('meilisearch_index_pdfs');
+    $indexOffice = (bool) \Contao\Config::get('meilisearch_index_office');
+    $tikaUrl     = \Contao\Config::get('meilisearch_tika_url');
+
+    if (($indexPdf || $indexOffice) && !$tikaUrl) {
+        throw new \RuntimeException(
+            'Die Tika-URL ist erforderlich, wenn PDF- oder Office-Indexierung aktiviert ist.'
+        );
+    }
+};
\ No newline at end of file