diff --git a/ios/Runner/AppDelegate.swift b/ios/Runner/AppDelegate.swift
index 998004a..ce641d0 100644
--- a/ios/Runner/AppDelegate.swift
+++ b/ios/Runner/AppDelegate.swift
@@ -386,15 +386,29 @@ final class PipShadowCoordinator: NSObject, AVPictureInPictureControllerDelegate
       guard call.method == "shareText",
             let arguments = call.arguments as? [String: Any],
             let text = arguments["text"] as? String,
-            !text.isEmpty,
-            let controller = self?.window?.rootViewController else {
+            !text.isEmpty else {
         result(FlutterError(code: "share_unavailable", message: "Share sheet is unavailable", details: nil))
         return
       }
-      let activity = UIActivityViewController(activityItems: [text], applicationActivities: nil)
-      activity.popoverPresentationController?.sourceView = controller.view
-      activity.completionWithItemsHandler = { _, _, _, _ in result(nil) }
-      controller.present(activity, animated: true)
+      DispatchQueue.main.async {
+        guard let controller = self?.sharePresenter() else {
+          result(FlutterError(code: "share_unavailable", message: "Share sheet is unavailable", details: nil))
+          return
+        }
+        let activity = UIActivityViewController(activityItems: [text], applicationActivities: nil)
+        if let popover = activity.popoverPresentationController {
+          popover.sourceView = controller.view
+          popover.sourceRect = CGRect(
+            x: controller.view.bounds.midX,
+            y: controller.view.bounds.midY,
+            width: 0,
+            height: 0
+          )
+          popover.permittedArrowDirections = []
+        }
+        activity.completionWithItemsHandler = { _, _, _, _ in result(nil) }
+        controller.present(activity, animated: true)
+      }
     }
 
     let thumbnailChannel = FlutterMethodChannel(
@@ -459,6 +473,34 @@ final class PipShadowCoordinator: NSObject, AVPictureInPictureControllerDelegate
     }
   }
 
+  /// 当前前台 Scene 的根控制器之上，最适合展示系统分享面板的控制器。
+  private func sharePresenter() -> UIViewController? {
+    let keyWindow = UIApplication.shared.connectedScenes
+      .compactMap { $0 as? UIWindowScene }
+      .first { $0.activationState == .foregroundActive }?
+      .windows.first { $0.isKeyWindow }
+    guard let rootController = keyWindow?.rootViewController else { return nil }
+    let presenter = topPresentedController(from: rootController)
+    guard presenter.viewIfLoaded?.window != nil else { return nil }
+    return presenter
+  }
+
+  /// 解析已展示页面、导航栈和标签页中的当前可见控制器。
+  private func topPresentedController(from controller: UIViewController) -> UIViewController {
+    if let presented = controller.presentedViewController {
+      return topPresentedController(from: presented)
+    }
+    if let navigation = controller as? UINavigationController,
+       let visible = navigation.visibleViewController {
+      return topPresentedController(from: visible)
+    }
+    if let tabs = controller as? UITabBarController,
+       let selected = tabs.selectedViewController {
+      return topPresentedController(from: selected)
+    }
+    return controller
+  }
+
   /// iOS 画中画：影子播放器通道，与 Android 共用同一 channel 名。
   private func registerPipChannel(_ engineBridge: FlutterImplicitEngineBridge) {
     let channel = FlutterMethodChannel(
diff --git a/lib/core/config/app_config.dart b/lib/core/config/app_config.dart
index ce8085a..9fc3f53 100644
--- a/lib/core/config/app_config.dart
+++ b/lib/core/config/app_config.dart
@@ -1,5 +1,7 @@
 // Author: fruit.com.cn
 
+import 'package:flutter/foundation.dart';
+
 import 'dev_config.dart';
 import 'prod_config.dart';
 
@@ -9,12 +11,10 @@ import 'prod_config.dart';
 /// - `dev_config.dart`：[DevConfig]（本机联调）
 /// - `prod_config.dart`：[ProdConfig]（生产）
 ///
-/// 切换环境只改下面这一个布尔值，不用传任何构建参数、也不做网络探测。
+/// Debug 使用开发环境，Release 自动使用生产环境，不做网络探测。
 abstract final class AppConfig {
-  /// **环境开关**：true 用开发环境，false 用生产环境。
-  ///
-  /// 打生产包前必须改成 false；release 构建若仍为 true 会在启动时直接报错。
-  static const bool useDevConfig = false;
+  /// **环境开关**：Debug 使用开发环境，Release 使用生产环境。
+  static const bool useDevConfig = !kReleaseMode;
 
   /// 当前选中的环境地址。
   static String get baseUrl =>
diff --git a/lib/pages/player/widgets/home_feed_overlay.dart b/lib/pages/player/widgets/home_feed_overlay.dart
index 4331df2..a85f3b4 100644
--- a/lib/pages/player/widgets/home_feed_overlay.dart
+++ b/lib/pages/player/widgets/home_feed_overlay.dart
@@ -27,6 +27,7 @@ const double _progressHeight = 2;
 const double _progressHitHeight = 16;
 const double _pageHorizontal = 20;
 const double _railRight = 14;
+const double _railShiftRight = 8;
 const double _railGap = 12;
 const double _railWidth = 56;
 const double _infoWatchAllGap = 2;
@@ -234,7 +235,10 @@ class _HomeFeedOverlayState extends State<HomeFeedOverlay> {
                         padding: const EdgeInsets.only(
                           bottom: _railBottomOffset,
                         ),
-                        child: _rail(),
+                        child: Transform.translate(
+                          offset: const Offset(_railShiftRight, 0),
+                          child: _rail(),
+                        ),
                       ),
                     ),
                   ],
diff --git a/test/core/app_config_environment_test.dart b/test/core/app_config_environment_test.dart
new file mode 100644
index 0000000..2cce7e2
--- /dev/null
+++ b/test/core/app_config_environment_test.dart
@@ -0,0 +1,18 @@
+// Author: fruit.com.cn
+
+// 应用环境选择测试。
+import 'package:flutter/foundation.dart';
+import 'package:flutter_test/flutter_test.dart';
+import 'package:fruitshorts/core/config/app_config.dart';
+import 'package:fruitshorts/core/config/dev_config.dart';
+import 'package:fruitshorts/core/config/prod_config.dart';
+
+void main() {
+  test('should_use_environment_matching_build_mode', () {
+    expect(AppConfig.useDevConfig, !kReleaseMode);
+    expect(
+      AppConfig.baseUrl,
+      kReleaseMode ? ProdConfig.baseUrl : DevConfig.baseUrl,
+    );
+  });
+}
diff --git a/test/home/home_preview_layout_test.dart b/test/home/home_preview_layout_test.dart
index 6e94a94..a0429f6 100644
--- a/test/home/home_preview_layout_test.dart
+++ b/test/home/home_preview_layout_test.dart
@@ -373,7 +373,7 @@ void main() {
     expect(
       tester.getRect(find.byKey(const Key('home-feed-action-rail'))).right,
       closeTo(
-        tester.getRect(find.byKey(const Key('home-feed-gesture'))).right - 14,
+        tester.getRect(find.byKey(const Key('home-feed-gesture'))).right - 6,
         0.1,
       ),
     );