diff --git a/src/App/ConfigLoader.php b/src/App/ConfigLoader.php
index 77bb992b..cb117a3a 100644
--- a/src/App/ConfigLoader.php
+++ b/src/App/ConfigLoader.php
@@ -14,7 +14,7 @@ final class ConfigLoader
         $basePath = $projectRoot . '/config/' . $name . '.php';
         $config = is_file($basePath) ? require $basePath : [];
 
-        $appEnv = getenv('APP_ENV') ?: 'local';
+        $appEnv = self::detectEnvironment();
         $envPath = $projectRoot . '/config/' . $appEnv . '/' . $name . '.php';
 
         if (!is_file($envPath)) {
@@ -45,4 +45,27 @@ final class ConfigLoader
 
         return $base;
     }
+
+    private static function detectEnvironment(): string
+    {
+        $appEnv = trim((string) getenv('APP_ENV'));
+        if ($appEnv !== '') {
+            return $appEnv;
+        }
+
+        $host = strtolower(trim((string) ($_SERVER['HTTP_HOST'] ?? $_SERVER['SERVER_NAME'] ?? '')));
+        if ($host === '') {
+            return 'local';
+        }
+
+        if (str_contains($host, 'staging.')) {
+            return 'staging';
+        }
+
+        if (str_contains($host, 'desktop.kusche.berlin')) {
+            return 'prod';
+        }
+
+        return 'local';
+    }
 }