diff --git a/UtopiaCanteen.Backend/UtopiaCanteen.Backend.csproj b/UtopiaCanteen.Backend/UtopiaCanteen.Backend.csproj
index 28601a6..1eee47d 100644
--- a/UtopiaCanteen.Backend/UtopiaCanteen.Backend.csproj
+++ b/UtopiaCanteen.Backend/UtopiaCanteen.Backend.csproj
@@ -12,6 +12,7 @@
     <PackageReference Include="Microsoft.EntityFrameworkCore" Version="8.0.11" />
     <PackageReference Include="Microsoft.EntityFrameworkCore.Sqlite" Version="8.0.11" />
     <PackageReference Include="MySqlConnector" Version="2.3.5" />
+    <PackageReference Include="Microsoft.Extensions.Logging.Abstractions" Version="8.0.2" />
   </ItemGroup>
 
   <ItemGroup>
diff --git a/UtopiaCanteen.Client/UtopiaCanteen.Client.csproj b/UtopiaCanteen.Client/UtopiaCanteen.Client.csproj
index 7b7b848..a387958 100644
--- a/UtopiaCanteen.Client/UtopiaCanteen.Client.csproj
+++ b/UtopiaCanteen.Client/UtopiaCanteen.Client.csproj
@@ -59,6 +59,8 @@
     <Compile Include="..\Services\IRfidService.cs" Link="Services\IRfidService.cs" />
     <Compile Include="..\Services\ScanResult.cs" Link="Services\ScanResult.cs" />
     <Compile Include="..\Services\Logger.cs" Link="Services\Logger.cs" />
+    <Compile Include="..\Services\Logging\**\*.cs" LinkBase="Services\Logging" />
+    <Compile Include="..\Services\SyncNowResult.cs" Link="Services\SyncNowResult.cs" />
     <Compile Include="..\Services\NavigationService.cs" Link="Services\NavigationService.cs" />
     <Compile Include="..\Services\INavigationService.cs" Link="Services\INavigationService.cs" />
     <Compile Include="..\Services\AppSession.cs" Link="Services\AppSession.cs" />
diff --git a/ViewModels/AdminLoginViewModel.cs b/ViewModels/AdminLoginViewModel.cs
index a97bb24..cd78c69 100644
--- a/ViewModels/AdminLoginViewModel.cs
+++ b/ViewModels/AdminLoginViewModel.cs
@@ -1,6 +1,7 @@
 using CommunityToolkit.Mvvm.ComponentModel;
 using CommunityToolkit.Mvvm.Input;
 using UtopiaCanteenSystem.Services;
+using UtopiaCanteenSystem.Services.Logging;
 
 namespace UtopiaCanteenSystem.ViewModels;
 
@@ -84,6 +85,7 @@ public partial class AdminLoginViewModel : ObservableObject
             if (!result.Success)
             {
                 ErrorMessage = "Invalid username or password.";
+                FileLogger.Warn("ClientLogin", $"Admin login failed for user '{user}'.");
                 return;
             }
 
@@ -95,6 +97,10 @@ public partial class AdminLoginViewModel : ObservableObject
                 _employeeLookup,
                 _backendApi).ConfigureAwait(true);
 
+            FileLogger.Info(
+                "ClientLogin",
+                $"Admin login succeeded. EmployeeId={result.EmployeeId}, AdminCardId saved, SiteId={_config.GetSiteId()}");
+
             // Persist who logged in (for audit / reporting).
             await _adminAudit.RecordLoginAsync(user, result.EmployeeId).ConfigureAwait(false);
 
diff --git a/ViewModels/ScannerDashboardViewModel.cs b/ViewModels/ScannerDashboardViewModel.cs
index 464bbc1..014aa63 100644
--- a/ViewModels/ScannerDashboardViewModel.cs
+++ b/ViewModels/ScannerDashboardViewModel.cs
@@ -12,6 +12,7 @@ using CommunityToolkit.Mvvm.ComponentModel;
 using CommunityToolkit.Mvvm.Input;
 using UtopiaCanteenSystem.Models;
 using UtopiaCanteenSystem.Services;
+using UtopiaCanteenSystem.Services.Logging;
 
 namespace UtopiaCanteenSystem.ViewModels;
 
@@ -570,9 +571,11 @@ public partial class ScannerDashboardViewModel : ObservableObject
             if (string.IsNullOrWhiteSpace(cardId))
                 return;
 
+            FileLogger.Info("ClientScan", $"Scan started. CardId={LogMasking.MaskCardId(cardId)}");
             var result = _rfidService.ProcessScanDetailed(cardId);
             IsSuccess = result.Success;
             Message = result.Message;
+            FileLogger.Info("ClientScan", $"Scan UI message. Success={result.Success}, Message={result.Message}");
 
             // Check if this is a site mismatch error
             if (!result.Success && result.Message.Contains("not allowed to scan here"))