diff --git a/src/dotnet/QuantEngine.Web/Client/Layout/AuthLayout.razor b/src/dotnet/QuantEngine.Web/Client/Layout/AuthLayout.razor
index 65792e4..1314d79 100644
--- a/src/dotnet/QuantEngine.Web/Client/Layout/AuthLayout.razor
+++ b/src/dotnet/QuantEngine.Web/Client/Layout/AuthLayout.razor
@@ -1,14 +1,11 @@
 @inherits LayoutComponentBase
-@inject MudThemeProvider MudThemeProvider
-
-<MudThemeProvider @ref="mudThemeProvider" @bind-IsDarkMode="@isDarkMode" />
 
 <div class="auth-container">
     <!-- Left Panel - Branding -->
     <MudHidden Breakpoint="Breakpoint.SmAndDown" Invert="true" Class="auth-left-panel">
         <div class="auth-branding">
             <div class="auth-logo">
-                <MudIcon Icon="@Icons.Material.Filled.AnalyticsFill" Size="Size.Large" />
+                <MudIcon Icon="@Icons.Material.Filled.Dashboard" Size="Size.Large" />
             </div>
             <MudText Typo="Typo.h3" Class="auth-title">
                 QuantEngine
@@ -32,14 +29,6 @@
             </div>
         </div>
 
-        <!-- Dark Mode Toggle -->
-        <div class="auth-theme-toggle">
-            <MudIconButton Icon="@(isDarkMode ? Icons.Material.Filled.Brightness4 : Icons.Material.Filled.Brightness7)"
-                          Color="Color.Inherit"
-                          OnClick="ToggleDarkMode"
-                          Title="@(isDarkMode ? "라이트 모드" : "다크 모드")"
-                          Size="Size.Large" />
-        </div>
     </MudHidden>
 
     <!-- Right Panel - Auth Content -->
@@ -48,13 +37,9 @@
         <MudHidden Breakpoint="Breakpoint.MdAndUp" Invert="true">
             <div class="auth-mobile-header">
                 <MudText Typo="Typo.h5" Class="d-flex align-center">
-                    <MudIcon Icon="@Icons.Material.Filled.AnalyticsFill" Size="Size.Medium" Class="mr-2" />
+                    <MudIcon Icon="@Icons.Material.Filled.Dashboard" Size="Size.Medium" Class="mr-2" />
                     QuantEngine
                 </MudText>
-                <MudIconButton Icon="@(isDarkMode ? Icons.Material.Filled.Brightness4 : Icons.Material.Filled.Brightness7)"
-                              Color="Color.Inherit"
-                              OnClick="ToggleDarkMode"
-                              Title="@(isDarkMode ? "라이트 모드" : "다크 모드")" />
             </div>
         </MudHidden>
 
@@ -78,21 +63,4 @@
 </div>
 
 @code {
-    private MudThemeProvider mudThemeProvider = default!;
-    private bool isDarkMode = false;
-
-    protected override async Task OnAfterRenderAsync(bool firstRender)
-    {
-        if (firstRender)
-        {
-            isDarkMode = await mudThemeProvider.GetDarkModeAsync() ?? false;
-            StateHasChanged();
-        }
-    }
-
-    private async Task ToggleDarkMode()
-    {
-        isDarkMode = !isDarkMode;
-        await mudThemeProvider.SetDarkModeAsync(isDarkMode);
-    }
 }
diff --git a/src/dotnet/QuantEngine.Web/Client/Layout/MainLayout.razor b/src/dotnet/QuantEngine.Web/Client/Layout/MainLayout.razor
index cc63168..252a537 100644
--- a/src/dotnet/QuantEngine.Web/Client/Layout/MainLayout.razor
+++ b/src/dotnet/QuantEngine.Web/Client/Layout/MainLayout.razor
@@ -2,7 +2,6 @@
 @inject HttpClient Http
 @inject AuthenticationStateProvider AuthStateProvider
 @inject NavigationManager NavigationManager
-@inject MudThemeProvider MudThemeProvider
 
 <MudLayout>
     <!-- Top Navigation Bar -->
@@ -18,12 +17,6 @@
 
         <MudSpacer />
 
-        <!-- Theme Toggle -->
-        <MudIconButton Icon="@(isDarkMode ? Icons.Material.Filled.Brightness4 : Icons.Material.Filled.Brightness7)"
-                       Color="Color.Inherit"
-                       OnClick="ToggleDarkMode"
-                       Title="@(isDarkMode ? "라이트 모드" : "다크 모드")" />
-
         <!-- User Menu -->
         <AuthorizeView>
             <Authorized>
@@ -102,19 +95,8 @@
 @code {
     private bool navOpen = true;
     private bool fixedOpen = true;
-    private bool isDarkMode = false;
     private string appVersion = "Local Debug";
     private string buildTime = "N/A";
-    private MudTheme currentTheme = default!;
-
-    protected override async Task OnAfterRenderAsync(bool firstRender)
-    {
-        if (firstRender)
-        {
-            isDarkMode = await MudThemeProvider.GetDarkModeAsync() ?? false;
-            StateHasChanged();
-        }
-    }
 
     protected override async Task OnInitializedAsync()
     {
@@ -134,12 +116,6 @@
         await base.OnInitializedAsync();
     }
 
-    private async Task ToggleDarkMode()
-    {
-        isDarkMode = !isDarkMode;
-        await MudThemeProvider.SetDarkModeAsync(isDarkMode);
-    }
-
     private void ToggleDrawer()
     {
         navOpen = !navOpen;