diff --git a/mobile/lib/config.dart b/mobile/lib/config.dart
index 2b1e2b4..ad0889c 100644
--- a/mobile/lib/config.dart
+++ b/mobile/lib/config.dart
@@ -30,4 +30,7 @@ const String wsAddr = 'ws://$serverHost:$wsPort';
 const String livekitUrl = 'ws://$serverHost:$livekitPort';
 
 /// 公司账号登录后端地址，例：http://192.168.200.11:10010
-const String authApiBase = 'http://$serverHost:$authApiPort';
+///
+/// 仅本地联调用：`--dart-define=AUTH_HOST=127.0.0.1` 可覆盖登录服务地址（OpenIM/LiveKit
+/// 仍走 [serverHost]），正式打包不带该参数则与 [serverHost] 一致。
+const String authApiBase = 'http://${String.fromEnvironment('AUTH_HOST', defaultValue: serverHost)}:$authApiPort';