diff --git a/Assets/Scenes/PeipeiFixScene.unity b/Assets/Scenes/PeipeiFixScene.unity
index ddc4c979b..02fb78829 100644
--- a/Assets/Scenes/PeipeiFixScene.unity
+++ b/Assets/Scenes/PeipeiFixScene.unity
@@ -972,6 +972,7 @@ MonoBehaviour:
   m_Name: 
   m_EditorClassIdentifier: 
   sortingOrder: 0
+  overlayShader: {fileID: 4800000, guid: 6652ed847ed1bc641bd702f03c650adf, type: 3}
 --- !u!1 &136303348
 GameObject:
   m_ObjectHideFlags: 0
diff --git a/Assets/Scripts/MiniGame/Peipei/Eye/EyeViewportOverlay.cs b/Assets/Scripts/MiniGame/Peipei/Eye/EyeViewportOverlay.cs
index f1933af87..55281c470 100644
--- a/Assets/Scripts/MiniGame/Peipei/Eye/EyeViewportOverlay.cs
+++ b/Assets/Scripts/MiniGame/Peipei/Eye/EyeViewportOverlay.cs
@@ -23,9 +23,14 @@ namespace AibisDream
         /// <summary>Persistence：本遮罩=0，UI Canvas=1，Dialog Canvas=3。</summary>
         [SerializeField] private int sortingOrder;
 
+        [Tooltip("Assign in Inspector so the shader is included in builds. Falls back to Shader.Find at runtime.")]
+        [SerializeField] private Shader overlayShader;
+
         private Canvas overlayCanvas;
         private Image overlayImage;
         private Material instanceMaterial;
+        private bool overlayShaderAvailable;
+        private bool overlayFallbackLogged;
         private EyeVisualSettings activeSettings;
         private Coroutine autoBlinkRoutine;
         private Tween blinkTween;
@@ -251,6 +256,7 @@ namespace AibisDream
             return Application.isPlaying
                    && moduleActive
                    && !editorPreviewActive
+                   && overlayShaderAvailable
                    && settings != null
                    && settings.enableViewportOverlay;
         }
@@ -279,6 +285,12 @@ namespace AibisDream
             }
 
             PrepareHierarchyIfNeeded();
+            if (!overlayShaderAvailable || instanceMaterial == null)
+            {
+                DisableOverlayFallback();
+                return;
+            }
+
             ApplyCanvasRenderSettings();
             activeSettings = settings;
             ApplySettings(settings);
@@ -409,6 +421,16 @@ namespace AibisDream
             EnsureOverlayHierarchy();
             hierarchyReady = overlayCanvas != null;
 
+            if (!overlayShaderAvailable || instanceMaterial == null)
+            {
+                if (moduleActive || editorPreviewActive)
+                {
+                    DisableOverlayFallback();
+                }
+
+                yield break;
+            }
+
             if (activeSettings != null && instanceMaterial != null)
             {
                 PushViewportParams(activeSettings);
@@ -447,19 +469,49 @@ namespace AibisDream
                 overlayImage = imageGo.AddComponent<Image>();
                 overlayImage.raycastTarget = false;
                 overlayImage.color = Color.black;
-                SetupMaterial();
+                if (!TrySetupOverlayMaterial())
+                {
+                    SetOverlayActive(false);
+                }
             }
 
             ApplyCanvasRenderSettings();
         }
 
-        private void SetupMaterial()
+        private void DisableOverlayFallback()
         {
-            Shader shader = Shader.Find("UI/EyeViewportOverlay");
+            StopEffects();
+            SetOverlayActive(false);
+
+            if (overlayFallbackLogged)
+            {
+                return;
+            }
+
+            overlayFallbackLogged = true;
+            Debug.LogWarning(
+                "[EyeViewportOverlay] 遮罩 shader 不可用，已跳过眼洞遮罩（视觉模块仍可正常使用，只是没有椭圆暗角/眨眼）。",
+                this);
+        }
+
+        private bool TrySetupOverlayMaterial()
+        {
+            overlayShaderAvailable = false;
+
+            Shader shader = overlayShader != null
+                ? overlayShader
+                : Shader.Find("UI/EyeViewportOverlay");
+
             if (shader == null)
             {
                 Debug.LogError("[EyeViewportOverlay] 找不到 UI/EyeViewportOverlay shader。", this);
-                return;
+                return false;
+            }
+
+            if (!shader.isSupported)
+            {
+                Debug.LogError("[EyeViewportOverlay] UI/EyeViewportOverlay shader 在当前平台不受支持。", this);
+                return false;
             }
 
             instanceMaterial = new Material(shader)
@@ -468,6 +520,8 @@ namespace AibisDream
                 hideFlags = HideFlags.DontSave
             };
             overlayImage.material = instanceMaterial;
+            overlayShaderAvailable = true;
+            return true;
         }
 
         private void ApplyCanvasRenderSettings()
@@ -478,7 +532,8 @@ namespace AibisDream
             }
 
             overlayCanvas.renderMode = RenderMode.ScreenSpaceCamera;
-            overlayCanvas.worldCamera = ResolveUICamera();
+            Camera uiCamera = ResolveUICamera();
+            overlayCanvas.worldCamera = uiCamera;
             overlayCanvas.planeDistance = OverlayPlaneDistance;
             overlayCanvas.sortingLayerName = OverlaySortingLayer;
             overlayCanvas.sortingOrder = sortingOrder;
diff --git a/ProjectSettings/GraphicsSettings.asset b/ProjectSettings/GraphicsSettings.asset
index be851a423..307f43c67 100644
--- a/ProjectSettings/GraphicsSettings.asset
+++ b/ProjectSettings/GraphicsSettings.asset
@@ -34,6 +34,7 @@ GraphicsSettings:
   - {fileID: 10753, guid: 0000000000000000f000000000000000, type: 0}
   - {fileID: 10770, guid: 0000000000000000f000000000000000, type: 0}
   - {fileID: 10783, guid: 0000000000000000f000000000000000, type: 0}
+  - {fileID: 4800000, guid: 6652ed847ed1bc641bd702f03c650adf, type: 3}
   m_PreloadedShaders: []
   m_PreloadShadersBatchTimeLimit: -1
   m_SpritesDefaultMaterial: {fileID: 10754, guid: 0000000000000000f000000000000000, type: 0}