diff --git a/frontend/mobile-app/lib/features/auth/presentation/pages/guide_page.dart b/frontend/mobile-app/lib/features/auth/presentation/pages/guide_page.dart
index 90e9e1af..2b0d1a93 100644
--- a/frontend/mobile-app/lib/features/auth/presentation/pages/guide_page.dart
+++ b/frontend/mobile-app/lib/features/auth/presentation/pages/guide_page.dart
@@ -620,7 +620,7 @@ class _WelcomePageContentState extends ConsumerState<_WelcomePageContent> {
                             hintText: '请输入推荐码 / 序列号',
                             hintStyle: TextStyle(
                               fontSize: 16.sp,
-                              color: Colors.white.withValues(alpha: 0.6),
+                              color: Colors.black.withValues(alpha: 0.4),
                             ),
                             border: InputBorder.none,
                             isDense: true,
@@ -628,9 +628,9 @@ class _WelcomePageContentState extends ConsumerState<_WelcomePageContent> {
                           ),
                           style: TextStyle(
                             fontSize: 16.sp,
-                            color: Colors.white,
+                            color: Colors.black,
                           ),
-                          cursorColor: Colors.white,
+                          cursorColor: Colors.black,
                         ),
                       ),
                       // 扫码按钮