diff --git a/src/FrontOffice.Main/Pages/Store/ProductDetail.razor.cs b/src/FrontOffice.Main/Pages/Store/ProductDetail.razor.cs
index 4a5fb07..fea4dde 100644
--- a/src/FrontOffice.Main/Pages/Store/ProductDetail.razor.cs
+++ b/src/FrontOffice.Main/Pages/Store/ProductDetail.razor.cs
@@ -21,6 +21,7 @@ public partial class ProductDetail : ComponentBase, IDisposable
 
     private Product? _product;
     private bool _loading;
+    private bool _initialized;
     private int _qty = 1;
     private const int MinQty = 1;
     
@@ -48,29 +49,35 @@ public partial class ProductDetail : ComponentBase, IDisposable
     private bool IsInCart => CurrentCartItem is not null;
     private int CurrentCartQuantity => CurrentCartItem?.Quantity ?? 0;
 
-    protected override async Task OnParametersSetAsync()
-    {
-      
-    }
-
     protected override async Task OnInitializedAsync()
     {
         _isAuthenticated = await AuthService.IsAuthenticatedAsync();
         await Cart.EnsureInitializedAsync();
         Cart.OnChange += HandleCartChanged;
-        
-   
-        
+        _initialized = true;
+    }
+
+    protected override async Task OnParametersSetAsync()
+    {
+        if (!_initialized || id <= 0)
+            return;
+
+        await LoadProductAsync();
+    }
+
+    private async Task LoadProductAsync()
+    {
         _loading = true;
         _product = await ProductService.GetByIdAsync(id);
         _loading = false;
+
         if (_product is not null)
         {
             _galleryItems = BuildGalleryItems(_product);
             _selectedGalleryImage = _galleryItems.FirstOrDefault();
             _categoryPaths = _product.Categories;
             UpdateBreadcrumb();
-            _qty = Math.Clamp(CurrentCartItem?.Quantity ?? _qty, MinQty, MaxQty);
+            _qty = Math.Clamp(CurrentCartItem?.Quantity ?? MinQty, MinQty, Math.Max(MinQty, MaxQty));
         }
         else
         {
@@ -78,19 +85,16 @@ public partial class ProductDetail : ComponentBase, IDisposable
             _categoryPaths = Array.Empty<ProductCategoryPathInfo>();
             _breadcrumbItems.Clear();
         }
-
-        StateHasChanged();
-        await base.OnInitializedAsync();
     }
 
     protected override async Task OnAfterRenderAsync(bool firstRender)
     {
-       await base.OnAfterRenderAsync(firstRender);
         if (firstRender)
         {
-            // بارگذاری نرخ VAT
             await VAT.LoadAsync();
         }
+
+        await base.OnAfterRenderAsync(firstRender);
     }
 
     private async Task AddToCart()
diff --git a/src/FrontOffice.Main/Utilities/ProductService.cs b/src/FrontOffice.Main/Utilities/ProductService.cs
index 39b7f9c..4bfaeed 100644
--- a/src/FrontOffice.Main/Utilities/ProductService.cs
+++ b/src/FrontOffice.Main/Utilities/ProductService.cs
@@ -137,30 +137,66 @@ public class ProductService
 
     public async Task<Product?> GetByIdAsync(long id)
     {
-        if (TryGetCachedProduct(id, out var cached) && HasDetailedData(cached))
-        {
-            return cached;
-        }
+        if (id <= 0)
+            return null;
 
+        TryGetCachedProduct(id, out var cached);
+
+        if (cached is not null && HasDetailedData(cached))
+            return cached;
+
+        // جزئیات کامل (گالری + دسته‌بندی)
+        var detailed = await TryFetchDetailAsync(id);
+        if (detailed is not null)
+            return detailed;
+
+        // fallback: همان API لیست محصولات — ناموجودها را هم برمی‌گرداند
+        var fromFilter = await TryFetchByFilterIdAsync(id);
+        if (fromFilter is not null)
+            return fromFilter;
+
+        return cached;
+    }
+
+    private async Task<Product?> TryFetchDetailAsync(long id)
+    {
         try
         {
             var resp = await _client.GetProductsAsync(new GetProductsRequest { Id = id });
-            if (resp == null)
-            {
+            if (resp is null || resp.Id <= 0)
                 return null;
-            }
 
             return MapAndCache(resp);
         }
         catch
         {
-            if (cached is not null)
-            {
-                return cached;
-            }
+            return null;
+        }
+    }
 
-            TryGetCachedProduct(id, out var result);
-            return result;
+    private async Task<Product?> TryFetchByFilterIdAsync(long id)
+    {
+        try
+        {
+            var resp = await _client.GetAllProductsByFilterAsync(new GetAllProductsByFilterRequest
+            {
+                PaginationState = new CMSMicroservice.Protobuf.Protos.PaginationState
+                {
+                    PageNumber = 1,
+                    PageSize = 1
+                },
+                Filter = new GetAllProductsByFilterFilter { Id = id }
+            });
+
+            var model = resp.Models.FirstOrDefault(m => m.Id == id);
+            if (model is null)
+                return null;
+
+            return MapAndCache(resp.Models).FirstOrDefault(p => p.Id == id);
+        }
+        catch
+        {
+            return null;
         }
     }