diff --git a/partials/structure/app_config.php b/partials/structure/app_config.php
index 00a165a..3155ef6 100644
--- a/partials/structure/app_config.php
+++ b/partials/structure/app_config.php
@@ -3,56 +3,73 @@
 
 // Host-Infos ermitteln (für URLs / Redirects etc.)
 $scheme     = (!empty($_SERVER['HTTPS']) && $_SERVER['HTTPS'] !== 'off') ? 'https' : 'http';
-$host       = $_SERVER['HTTP_HOST'] ?? app_primary_domain();
+$host       = $_SERVER['HTTP_HOST'] ?? (function_exists('app_primary_domain') ? app_primary_domain() : 'localhost');
 $requestUri = $_SERVER['REQUEST_URI'] ?? '/';
 
-// Aktuelle Sprache & Sprachen aus den GLOBALS (fileload.php)
-$currentLang     = $GLOBALS['lang']           ?? ($lang ?? 'en');
-$allAvailable    = $GLOBALS['availableLangs'] ?? [];
+// Aktuelle Sprache & Sprachen aus den GLOBALS (kommen aus fileload.php / i18n.php)
+$currentLang  = $GLOBALS['lang']           ?? ($lang ?? 'en');
+$allAvailable = $GLOBALS['availableLangs'] ?? [];
 
-// Optional: Environment aus config.php (du hattest $env → $GLOBALS['app_env'])
-$env = $GLOBALS['app_env'] ?? 'prod';
+// Environment & Basis-URLs aus config.php / fileload.php
+$appEnv      = $GLOBALS['app_env']      ?? (defined('APP_ENV') ? APP_ENV : 'prod');
+$appBaseUrl  = $GLOBALS['app_base_url'] ?? ($scheme . '://' . $host);
+$appApiBase  = $GLOBALS['app_api_base'] ?? ($scheme . '://api.' . ($host));
+
+// Optional: Helfer-Funktionen nutzen, falls vorhanden
+$primaryDomain   = function_exists('app_primary_domain')   ? app_primary_domain()   : $host;
+$primaryUrl      = function_exists('app_primary_url')      ? app_primary_url()      : ($scheme . '://' . $primaryDomain);
+$fakecheckDomain = function_exists('app_fakecheck_domain') ? app_fakecheck_domain() : null;
+$fakecheckUrl    = function_exists('app_fakecheck_url')    ? app_fakecheck_url()    : null;
+
+// i18n-Config aus deiner zentralen i18n-Logik
+$i18nConfig = function_exists('app_i18n_get_frontend_config')
+    ? app_i18n_get_frontend_config()
+    : [
+        'available' => $allAvailable,
+        'current'   => $currentLang,
+    ];
 
 // -----------------------------------------------
 // USBCheck JavaScript-Konfiguration
 // -----------------------------------------------
 $usbConfig = [
-    'lang'        => $currentLang,
+    'lang' => $currentLang,
 
     // Basis-Pfade
-    'assetsBase'  => '/assets',
+    'assetsBase'   => '/assets',
 
     // Versionierung für JS/CSS
-    'assetVersion'=> defined('ASSET_VERSION') ? ASSET_VERSION : null,
+    'assetVersion' => defined('ASSET_VERSION') ? ASSET_VERSION : null,
 
     // Environment (prod, staging, dev)
-    'env'         => $env,
+    'env'          => $appEnv,
 
     // Domains
-    'domains'     => [
-        'primaryDomain'   => app_primary_domain(),
-        'primaryUrl'      => app_primary_url(),
-        'fakecheckDomain' => app_fakecheck_domain(),
-        'fakecheckUrl'    => app_fakecheck_url(),
+    'domains'      => [
+        'primaryDomain'   => $primaryDomain,
+        'primaryUrl'      => $primaryUrl,
+        'fakecheckDomain' => $fakecheckDomain,
+        'fakecheckUrl'    => $fakecheckUrl,
     ],
 
     // Fakecheck-Tool-Config
-    'fakecheck' => [
-        'baseUrl'    => $GLOBALS['app_url']  ?? '',
-        'apiBaseUrl' => $GLOBALS['app_api_url']  ?? 'https://api.usbcheck.it',
+    'fakecheck'    => [
+        'baseUrl'    => $appBaseUrl,
+        'apiBaseUrl' => $appApiBase,
         'locale'     => $currentLang,
     ],
-    'i18n' => app_i18n_get_frontend_config(),
-    // i18n-Konfiguration
-    'i18n' => [
-        'available' => $allAvailable,
-        'current'   => $currentLang,
-    ],
+
+    // i18n-Konfiguration (zentrale Struktur)
+    'i18n'         => $i18nConfig,
 ];
 ?>
 <script>
-    window.usbConfig = <?= json_encode(
+    // Zentrales JS-Config-Objekt für deine Tools
+    window.usbcheck = <?= json_encode(
         $usbConfig,
         JSON_UNESCAPED_SLASHES | JSON_UNESCAPED_UNICODE | JSON_INVALID_UTF8_SUBSTITUTE
     ) ?>;
+
+    // Alias für eventuelle ältere Stellen
+    window.usbConfig = window.usbcheck;
 </script>