diff --git a/apps/web-client-tpos-net/src/WebClientTpos.Client/AppTheme.cs b/apps/web-client-tpos-net/src/WebClientTpos.Client/AppTheme.cs
new file mode 100644
index 00000000..bb9874ca
--- /dev/null
+++ b/apps/web-client-tpos-net/src/WebClientTpos.Client/AppTheme.cs
@@ -0,0 +1,57 @@
+// EN: Centralized MudBlazor theme definitions for all layouts.
+// VI: Định nghĩa MudBlazor theme tập trung cho tất cả layouts.
+
+using MudBlazor;
+
+namespace WebClientTpos.Client;
+
+/// <summary>
+/// EN: Centralized theme configuration — used by all layouts (Admin, Auth, POS, Marketing).
+/// VI: Cấu hình theme tập trung — sử dụng bởi tất cả layouts (Admin, Auth, POS, Marketing).
+/// </summary>
+public static class AppTheme
+{
+    /// <summary>
+    /// EN: Default dark theme — aPOS brand orange (#FF5C00) on dark background.
+    /// VI: Theme tối mặc định — thương hiệu aPOS cam (#FF5C00) trên nền tối.
+    /// Used by: AdminLayout, AuthLayout, PosLayout
+    /// </summary>
+    public static MudTheme DefaultDark { get; } = new()
+    {
+        PaletteDark = new PaletteDark()
+        {
+            Primary = "#FF5C00",
+            PrimaryContrastText = "#FFFFFF",
+            AppbarBackground = "#1A1A1D",
+            AppbarText = "#FFFFFF",
+            Background = "#0A0A0B",
+            Surface = "#1A1A1D",
+            TextPrimary = "#FFFFFF",
+            TextSecondary = "#ADADB0",
+            ActionDefault = "#FFFFFF",
+            LinesDefault = "#1F1F23"
+        }
+    };
+
+    /// <summary>
+    /// EN: Marketing dark theme — yellow accent (#FACC15) for tMarketing module.
+    /// VI: Theme tối Marketing — điểm nhấn vàng (#FACC15) cho module tMarketing.
+    /// Used by: MarketingLayout
+    /// </summary>
+    public static MudTheme MarketingDark { get; } = new()
+    {
+        PaletteDark = new PaletteDark()
+        {
+            Primary = "#FACC15",
+            PrimaryContrastText = "#18181B",
+            AppbarBackground = "#0F0F10",
+            AppbarText = "#FAFAFA",
+            Background = "#18181B",
+            Surface = "#0F0F10",
+            TextPrimary = "#FAFAFA",
+            TextSecondary = "#71717A",
+            ActionDefault = "#FAFAFA",
+            LinesDefault = "#27272A"
+        }
+    };
+}
diff --git a/apps/web-client-tpos-net/src/WebClientTpos.Client/Layout/AdminLayout.razor b/apps/web-client-tpos-net/src/WebClientTpos.Client/Layout/AdminLayout.razor
index a1ea7e3e..d6de8040 100644
--- a/apps/web-client-tpos-net/src/WebClientTpos.Client/Layout/AdminLayout.razor
+++ b/apps/web-client-tpos-net/src/WebClientTpos.Client/Layout/AdminLayout.razor
@@ -14,7 +14,7 @@
 @inject Microsoft.Extensions.Localization.IStringLocalizer<AdminLayout> L
 @using WebClientTpos.Client.Services
 
-<MudThemeProvider IsDarkMode="true" Theme="_theme" />
+<MudThemeProvider IsDarkMode="true" Theme="AppTheme.DefaultDark" />
 <MudPopoverProvider />
 <MudDialogProvider />
 <MudSnackbarProvider />
@@ -135,6 +135,13 @@
 
     @* ═══ MAIN AREA ═══ *@
     <main class="admin-main">
+        @* Mobile-only hamburger toggle *@
+        <div class="admin-mobile-bar">
+            <button class="admin-mobile-toggle" @onclick="ToggleSidebar">
+                <i data-lucide="menu"></i>
+            </button>
+            <span class="admin-mobile-bar__title">GoodGo Admin</span>
+        </div>
         <ErrorBoundary @ref="_errorBoundary">
             <ChildContent>
                 <CascadingValue Value="this">
@@ -263,22 +270,6 @@
         NavigationManager.NavigateTo("/auth/login", forceLoad: true);
     }
 
-    private MudTheme _theme = new()
-    {
-        PaletteDark = new PaletteDark()
-        {
-            Primary = "#FF5C00",
-            PrimaryContrastText = "#FFFFFF",
-            AppbarBackground = "#1A1A1D",
-            AppbarText = "#FFFFFF",
-            Background = "#0A0A0B",
-            Surface = "#1A1A1D",
-            TextPrimary = "#FFFFFF",
-            TextSecondary = "#ADADB0",
-            ActionDefault = "#FFFFFF",
-            LinesDefault = "#1F1F23"
-        }
-    };
 
     public void Dispose()
     {
diff --git a/apps/web-client-tpos-net/src/WebClientTpos.Client/Layout/AuthLayout.razor b/apps/web-client-tpos-net/src/WebClientTpos.Client/Layout/AuthLayout.razor
index 77fac367..c0c9a3c7 100644
--- a/apps/web-client-tpos-net/src/WebClientTpos.Client/Layout/AuthLayout.razor
+++ b/apps/web-client-tpos-net/src/WebClientTpos.Client/Layout/AuthLayout.razor
@@ -1,7 +1,8 @@
 @inherits LayoutComponentBase
 @inject IJSRuntime JS
+@inject Microsoft.Extensions.Localization.IStringLocalizer<AuthLayout> L
 
-<MudThemeProvider IsDarkMode="true" Theme="_theme" />
+<MudThemeProvider IsDarkMode="true" Theme="AppTheme.DefaultDark" />
 <MudPopoverProvider />
 <MudDialogProvider />
 <MudSnackbarProvider />
@@ -10,10 +11,10 @@
     <div class="tpos-navbar-inner">
         <a href="/" class="tpos-logo">aPOS</a>
         <div class="tpos-nav-links">
-            <a href="/#features" class="tpos-nav-link">Tính năng</a>
-            <a href="/#pricing" class="tpos-nav-link">Bảng giá</a>
-            <a href="/login" class="tpos-nav-link">Đăng nhập</a>
-            <a href="/register" class="btn-accent">Dùng thử</a>
+            <a href="/#features" class="tpos-nav-link">@L["Nav_Features"]</a>
+            <a href="/#pricing" class="tpos-nav-link">@L["Nav_Pricing"]</a>
+            <a href="/auth/login" class="tpos-nav-link">@L["Nav_Login"]</a>
+            <a href="/auth/register" class="btn-accent">@L["Nav_FreeTrial"]</a>
         </div>
     </div>
 </nav>
@@ -29,21 +30,4 @@
     {
         try { await JS.InvokeVoidAsync("lucide.createIcons"); } catch { }
     }
-
-    private MudTheme _theme = new()
-    {
-        PaletteDark = new PaletteDark()
-        {
-            Primary = "#FF5C00",
-            PrimaryContrastText = "#FFFFFF",
-            AppbarBackground = "rgba(10,10,11,0.85)",
-            AppbarText = "#FFFFFF",
-            Background = "#0A0A0B",
-            Surface = "#111113",
-            TextPrimary = "#FFFFFF",
-            TextSecondary = "#ADADB0",
-            ActionDefault = "#FFFFFF",
-            LinesDefault = "#1F1F23"
-        }
-    };
 }
diff --git a/apps/web-client-tpos-net/src/WebClientTpos.Client/Layout/MarketingLayout.razor b/apps/web-client-tpos-net/src/WebClientTpos.Client/Layout/MarketingLayout.razor
index d2e99073..90175c29 100644
--- a/apps/web-client-tpos-net/src/WebClientTpos.Client/Layout/MarketingLayout.razor
+++ b/apps/web-client-tpos-net/src/WebClientTpos.Client/Layout/MarketingLayout.razor
@@ -6,8 +6,10 @@
 @inherits LayoutComponentBase
 @inject NavigationManager NavigationManager
 @inject IJSRuntime JS
+@inject WebClientTpos.Client.Services.AuthService AuthSvc
+@using WebClientTpos.Client.Services
 
-<MudThemeProvider IsDarkMode="true" Theme="_theme" />
+<MudThemeProvider IsDarkMode="true" Theme="AppTheme.MarketingDark" />
 <MudPopoverProvider />
 <MudDialogProvider />
 <MudSnackbarProvider />
@@ -125,22 +127,12 @@
     private void ToggleSidebar() => _sidebarOpen = !_sidebarOpen;
     private void CloseSidebar() => _sidebarOpen = false;
     private void ToggleSearch() => _searchOpen = !_searchOpen;
-    private void Logout() => NavigationManager.NavigateTo("/login");
 
-    private MudTheme _theme = new()
+    // EN: Properly clear auth state on logout instead of just navigating
+    // VI: Xóa auth state đúng cách khi đăng xuất thay vì chỉ điều hướng
+    private async Task Logout()
     {
-        PaletteDark = new PaletteDark()
-        {
-            Primary = "#FACC15",
-            PrimaryContrastText = "#18181B",
-            AppbarBackground = "#0F0F10",
-            AppbarText = "#FAFAFA",
-            Background = "#18181B",
-            Surface = "#0F0F10",
-            TextPrimary = "#FAFAFA",
-            TextSecondary = "#71717A",
-            ActionDefault = "#FAFAFA",
-            LinesDefault = "#27272A"
-        }
-    };
+        await AuthSvc.LogoutAsync();
+        NavigationManager.NavigateTo("/auth/login", forceLoad: true);
+    }
 }
diff --git a/apps/web-client-tpos-net/src/WebClientTpos.Client/Layout/PosLayout.razor b/apps/web-client-tpos-net/src/WebClientTpos.Client/Layout/PosLayout.razor
index 655deef0..c2540bde 100644
--- a/apps/web-client-tpos-net/src/WebClientTpos.Client/Layout/PosLayout.razor
+++ b/apps/web-client-tpos-net/src/WebClientTpos.Client/Layout/PosLayout.razor
@@ -8,7 +8,7 @@
 @inject NavigationManager NavigationManager
 @inject WebClientTpos.Client.Services.PosDataService DataService
 
-<MudThemeProvider IsDarkMode="true" Theme="_theme" />
+<MudThemeProvider IsDarkMode="true" Theme="AppTheme.DefaultDark" />
 <MudPopoverProvider />
 <MudDialogProvider />
 <MudSnackbarProvider />
@@ -65,21 +65,6 @@
 
     private void GoToAdmin() => NavigationManager.NavigateTo("/admin");
 
-    private MudTheme _theme = new()
-    {
-        PaletteDark = new PaletteDark()
-        {
-            Primary = "#FF5C00",
-            PrimaryContrastText = "#FFFFFF",
-            AppbarBackground = "#1A1A1D",
-            AppbarText = "#FFFFFF",
-            Background = "#0A0A0B",
-            Surface = "#1A1A1D",
-            TextPrimary = "#FFFFFF",
-            TextSecondary = "#ADADB0",
-            ActionDefault = "#FFFFFF",
-            LinesDefault = "#1F1F23"
-        }
-    };
 }
 
+
diff --git a/apps/web-client-tpos-net/src/WebClientTpos.Client/Pages/Auth/Login.razor.bak b/apps/web-client-tpos-net/src/WebClientTpos.Client/Pages/Auth/Login.razor.bak
deleted file mode 100644
index 924e25b5..00000000
--- a/apps/web-client-tpos-net/src/WebClientTpos.Client/Pages/Auth/Login.razor.bak
+++ /dev/null
@@ -1,136 +0,0 @@
-@page "/login"
-@using WebClientTpos.Shared.DTOs
-@using WebClientTpos.Shared
-@inject HttpClient Http
-@inject NavigationManager Navigation
-@inject IStringLocalizer<Login> L
-
-@* 
-    EN: Login page with email/password authentication.
-    VI: Trang đăng nhập với xác thực email/mật khẩu.
-*@
-
-<PageTitle>@L["Auth_Login_Title"]</PageTitle>
-
-<div class="auth-container">
-    <section class="auth-card">
-        <h1 class="auth-title">@L["Auth_Login_Title"]</h1>
-        <p class="auth-subtitle">@L["Auth_Login_Subtitle"]</p>
-        
-        <EditForm Model="@loginModel" OnValidSubmit="HandleLogin" FormName="LoginForm">
-            <DataAnnotationsValidator />
-            
-            <div class="form-group">
-                <label for="login-email">@L["Auth_Login_Email"] *</label>
-                <InputText id="login-email" 
-                          @bind-Value="loginModel.Email" 
-                          class="form-input" 
-                          placeholder="email@example.com" 
-                          autocomplete="email" />
-                <ValidationMessage For="() => loginModel.Email" class="validation-message" />
-            </div>
-            
-            <div class="form-group">
-                <label for="login-password">@L["Auth_Login_Password"] *</label>
-                <InputText id="login-password" 
-                          @bind-Value="loginModel.Password" 
-                          type="password" 
-                          class="form-input" 
-                          placeholder="••••••••"
-                          autocomplete="current-password" />
-                <ValidationMessage For="() => loginModel.Password" class="validation-message" />
-            </div>
-            
-            <div class="form-actions-row">
-                <div class="checkbox-group">
-                    <InputCheckbox id="remember-me" 
-                                  @bind-Value="loginModel.RememberMe" 
-                                  class="form-checkbox" />
-                    <label for="remember-me" class="checkbox-label">@L["Auth_Login_RememberMe"]</label>
-                </div>
-                
-                <a href="/forgot-password" class="link-secondary">@L["Auth_Login_ForgotPassword"]</a>
-            </div>
-            
-            <button type="submit" class="btn-primary btn-full" disabled="@isSubmitting">
-                @if (isSubmitting)
-                {
-                    <span class="spinner-small"></span>
-                    <span>@L["Common_Loading"]</span>
-                }
-                else
-                {
-                    @L["Auth_Login_Submit"]
-                }
-            </button>
-        </EditForm>
-        
-        @if (!string.IsNullOrEmpty(message))
-        {
-            <div class="alert @(success ? "alert-success" : "alert-error")">
-                @message
-            </div>
-        }
-        
-        <div class="auth-footer">
-            <span>@L["Auth_Login_NoAccount"]</span>
-            <a href="/register" class="link-primary">@L["Auth_Login_RegisterLink"]</a>
-        </div>
-    </section>
-</div>
-
-@code {
-    private LoginDto loginModel = new();
-    private bool isSubmitting = false;
-    private string message = "";
-    private bool success = false;
-
-    /// <summary>
-    /// EN: Handle login form submission.
-    /// VI: Xử lý submit form đăng nhập.
-    /// </summary>
-    private async Task HandleLogin()
-    {
-        isSubmitting = true;
-        message = "";
-
-        try
-        {
-            var response = await Http.PostAsJsonAsync("api/auth/login", loginModel);
-            
-            if (response.IsSuccessStatusCode)
-            {
-                var result = await response.Content.ReadFromJsonAsync<ApiResponse<UserProfileDto>>();
-                if (result?.Success == true && result.Data != null)
-                {
-                    success = true;
-                    message = string.Format(L["Auth_Login_Success"], result.Data.DisplayName);
-                    
-                    // EN: Redirect to home after 1 second
-                    // VI: Chuyển hướng về trang chủ sau 1 giây
-                    await Task.Delay(1000);
-                    Navigation.NavigateTo("/");
-                }
-                else
-                {
-                    success = false;
-                    message = L["Auth_Login_Error"];
-                }
-            }
-            else
-            {
-                success = false;
-                message = L["Auth_Login_Error"];
-            }
-        }
-        catch (Exception ex)
-        {
-            success = false;
-            message = $"{L["Common_Error"]}: {ex.Message}";
-        }
-        finally
-        {
-            isSubmitting = false;
-        }
-    }
-}
diff --git a/apps/web-client-tpos-net/src/WebClientTpos.Client/wwwroot/css/admin.css b/apps/web-client-tpos-net/src/WebClientTpos.Client/wwwroot/css/admin.css
index 7e3a0393..c4e66de4 100644
--- a/apps/web-client-tpos-net/src/WebClientTpos.Client/wwwroot/css/admin.css
+++ b/apps/web-client-tpos-net/src/WebClientTpos.Client/wwwroot/css/admin.css
@@ -1518,4 +1518,53 @@ select.admin-form-input {
 
 .admin-status-badge--offline .admin-status-badge__dot {
     background-color: var(--admin-danger);
+}
+
+/* ═════════════════════════════════════════════════════════════════════════
+   17. MOBILE BAR (hamburger toggle header — visible ≤ 1024px only)
+   ═════════════════════════════════════════════════════════════════════════ */
+
+/* EN: Hidden on desktop / VI: Ẩn trên desktop */
+.admin-mobile-bar {
+    display: none;
+    align-items: center;
+    gap: 12px;
+    padding: 12px 20px;
+    background-color: var(--admin-bg-elevated);
+    border-bottom: 1px solid var(--admin-border-subtle);
+}
+
+.admin-mobile-toggle {
+    display: flex;
+    align-items: center;
+    justify-content: center;
+    width: 40px;
+    height: 40px;
+    border-radius: var(--admin-radius-md);
+    background: transparent;
+    border: 1px solid var(--admin-border-default);
+    color: var(--admin-text-primary);
+    cursor: pointer;
+    transition: background 0.2s ease;
+}
+
+.admin-mobile-toggle:hover {
+    background-color: var(--admin-bg-interactive);
+}
+
+.admin-mobile-toggle i {
+    width: 20px;
+    height: 20px;
+}
+
+.admin-mobile-bar__title {
+    font-size: 16px;
+    font-weight: 700;
+    color: var(--admin-text-primary);
+}
+
+@media (max-width: 1024px) {
+    .admin-mobile-bar {
+        display: flex;
+    }
 }
\ No newline at end of file