diff --git a/config/config.php b/config/config.php
index 09ec988..0729db9 100644
--- a/config/config.php
+++ b/config/config.php
@@ -386,7 +386,12 @@ define('APP_NAME', 'WhatsApp Bot System');
 define('APP_VERSION', '2.0.0');
 // URL auto-detectada según protocolo y host actuales
 if (!defined('APP_URL')) {
-    $__proto = (!empty($_SERVER['HTTPS']) && $_SERVER['HTTPS'] !== 'off') ? 'https' : 'http';
+    // Detectar HTTPS correctamente detrás de proxy reverso (Coolify, nginx, etc.)
+    $__isHttps = (!empty($_SERVER['HTTPS']) && $_SERVER['HTTPS'] !== 'off')
+              || ($_SERVER['HTTP_X_FORWARDED_PROTO'] ?? '') === 'https'
+              || ($_SERVER['HTTP_X_FORWARDED_SSL']   ?? '') === 'on'
+              || ($_SERVER['HTTP_FRONT_END_HTTPS']    ?? '') === 'on';
+    $__proto = $__isHttps ? 'https' : 'http';
     $__host  = $_SERVER['HTTP_HOST'] ?? 'localhost';
     define('APP_URL', $__proto . '://' . $__host);
 }