diff --git a/.gitattributes b/.gitattributes
index d8b7520..3a5cf25 100644
--- a/.gitattributes
+++ b/.gitattributes
@@ -1,3 +1,16 @@
-# Zorg dat omgevingsspecifieke bestanden nooit worden overschreven bij merges tussen dev en main
+# Automatische detectie van tekstbestanden en consistente line endings (LF)
+* text=auto eol=lf
 
+# Binaire bestanden
+*.png binary
+*.jpg binary
+*.jpeg binary
+*.gif binary
+*.ico binary
+*.pdf binary
+*.woff binary
+*.woff2 binary
 
+# Sluit repository metadata uit bij release archieven
+.gitattributes export-ignore
+.gitignore export-ignore
diff --git a/config/config.php b/config/config.php
index 5b66f5f..de59fb6 100644
--- a/config/config.php
+++ b/config/config.php
@@ -69,22 +69,37 @@ if (!function_exists('fociz_env')) {
 }
 
 // =========================================================================
-// 2. CENTRALE DATABASE CONFIGURATIE (DE ENIGE BRON VAN WAARHEID)
-// =========================================================================
-define('DB_HOST', fociz_env('DB_HOST', '192.168.2.33'));
-define('DB_PORT', fociz_env('DB_PORT', '3306'));
-define('DB_NAME', fociz_env('DB_NAME', 'fociz'));
-define('DB_USER', fociz_env('DB_USER', 'focizlive_user'));
-define('DB_PASS', fociz_env('DB_PASS', 'F0c1z_Live_Secure_2026!'));
-define('DB_CHARSET', 'utf8mb4');
-
-// =========================================================================
-// 3. APPLICATIE INSTELLINGEN & OMGEVING
+// 2. APPLICATIE INSTELLINGEN & OMGEVINGSDETECTIE
 // =========================================================================
 define('APP_NAME', 'Fociz');
-define('APP_ENV', fociz_env('APP_ENV', 'live')); // 'live' of 'development'
+
+// Automatische omgevingsdetectie:
+// 1. Expliciete .env variabele 'APP_ENV'
+// 2. Automatisch 'development' indien hostname 'dev.' of 'localhost' bevat
+// 3. Standaard 'live'
+$detectedHost = $_SERVER['HTTP_HOST'] ?? '';
+$isDevHost = (
+    str_contains($detectedHost, 'dev.') || 
+    str_contains($detectedHost, 'localhost') || 
+    str_contains($detectedHost, '127.0.0.1')
+);
+$defaultEnv = $isDevHost ? 'development' : 'live';
+define('APP_ENV', fociz_env('APP_ENV', $defaultEnv));
 define('APP_SECRET', fociz_env('APP_SECRET', 'fociz-maria-db-super-secret-key-998877'));
 
+// =========================================================================
+// 3. CENTRALE DATABASE CONFIGURATIE (OMGEVINGSAFHANKELIJK & GIT-VEILIG)
+// =========================================================================
+// Leest eerst eventuele .env variabelen (die per server uniek en gitignored zijn).
+// Indien niet ingesteld via .env, wordt automatisch de juiste database gekozen op basis van APP_ENV.
+$isDevEnv = (APP_ENV === 'development');
+define('DB_HOST', fociz_env('DB_HOST', '192.168.2.33'));
+define('DB_PORT', fociz_env('DB_PORT', '3306'));
+define('DB_NAME', fociz_env('DB_NAME', $isDevEnv ? 'focizdev' : 'fociz'));
+define('DB_USER', fociz_env('DB_USER', $isDevEnv ? 'focizdev_user' : 'focizlive_user'));
+define('DB_PASS', fociz_env('DB_PASS', $isDevEnv ? 'F0c1z_Dev_Secure_2026!' : 'F0c1z_Live_Secure_2026!'));
+define('DB_CHARSET', 'utf8mb4');
+
 // Bepaal de dynamische of geconfigureerde applicatie URL
 if (!function_exists('fociz_detect_app_url')) {
     function fociz_detect_app_url(): string {
diff --git a/includes/integrations/microsoft.php b/includes/integrations/microsoft.php
index 59f54fb..04479be 100644
--- a/includes/integrations/microsoft.php
+++ b/includes/integrations/microsoft.php
@@ -475,7 +475,7 @@ function microsoft_create_event(int $userId, array $eventData): array {
         'subject' => $subject,
         'body' => [
             'contentType' => 'HTML',
-            'content' => nl2br(htmlspecialchars($description)) . '<br><br><small style="color: #64748b;">Aangemaakt via <a href="https://dev.fociz.nl/planner.php">Fociz Dagplanning</a></small>',
+            'content' => nl2br(htmlspecialchars($description)) . '<br><br><small style="color: #64748b;">Aangemaakt via <a href="' . htmlspecialchars(defined('APP_URL') ? APP_URL : '') . '/planner.php">Fociz Dagplanning</a></small>',
         ],
         'start' => [
             'dateTime' => $startDateTimeStr,