diff --git a/.vs/AuthorBuddy.Web.slnx/v18/DocumentLayout.backup.json b/.vs/AuthorBuddy.Web.slnx/v18/DocumentLayout.backup.json
index 6bff376..24a5916 100644
--- a/.vs/AuthorBuddy.Web.slnx/v18/DocumentLayout.backup.json
+++ b/.vs/AuthorBuddy.Web.slnx/v18/DocumentLayout.backup.json
@@ -224,8 +224,7 @@
               "RelativeToolTip": "wwwroot\\app.css",
               "ViewState": "AgIAAJYCAAAAAAAAAAAiwKoCAAAJAAAAAAAAAA==",
               "Icon": "ae27a6b0-e345-4288-96df-5eaf394ee369.003000|",
-              "WhenOpened": "2026-07-04T08:22:21.143Z",
-              "EditorCaption": ""
+              "WhenOpened": "2026-07-04T08:22:21.143Z"
             },
             {
               "$type": "Document",
@@ -271,7 +270,7 @@
               "RelativeDocumentMoniker": "Components\\Layout\\MainLayout.razor",
               "ToolTip": "E:\\ollama_net\\ollama\\AuthorBuddy.Web\\Components\\Layout\\MainLayout.razor",
               "RelativeToolTip": "Components\\Layout\\MainLayout.razor",
-              "ViewState": "AgIAADIAAAAAAAAAAAApwEUAAAByAAAAAAAAAA==",
+              "ViewState": "AgIAADMAAAAAAAAAAAApwEYAAAByAAAAAAAAAA==",
               "Icon": "ae27a6b0-e345-4288-96df-5eaf394ee369.000759|",
               "WhenOpened": "2026-05-15T16:04:36.444Z",
               "EditorCaption": ""
@@ -310,8 +309,7 @@
               "RelativeToolTip": "Components\\Pages\\Settings.razor",
               "ViewState": "AgIAABIAAAAAAAAAAAAAADMAAAAfAAAAAAAAAA==",
               "Icon": "ae27a6b0-e345-4288-96df-5eaf394ee369.000759|",
-              "WhenOpened": "2026-05-15T16:43:26.6Z",
-              "EditorCaption": ""
+              "WhenOpened": "2026-05-15T16:43:26.6Z"
             },
             {
               "$type": "Document",
diff --git a/.vs/AuthorBuddy.Web.slnx/v18/DocumentLayout.json b/.vs/AuthorBuddy.Web.slnx/v18/DocumentLayout.json
index 6bff376..24a5916 100644
--- a/.vs/AuthorBuddy.Web.slnx/v18/DocumentLayout.json
+++ b/.vs/AuthorBuddy.Web.slnx/v18/DocumentLayout.json
@@ -224,8 +224,7 @@
               "RelativeToolTip": "wwwroot\\app.css",
               "ViewState": "AgIAAJYCAAAAAAAAAAAiwKoCAAAJAAAAAAAAAA==",
               "Icon": "ae27a6b0-e345-4288-96df-5eaf394ee369.003000|",
-              "WhenOpened": "2026-07-04T08:22:21.143Z",
-              "EditorCaption": ""
+              "WhenOpened": "2026-07-04T08:22:21.143Z"
             },
             {
               "$type": "Document",
@@ -271,7 +270,7 @@
               "RelativeDocumentMoniker": "Components\\Layout\\MainLayout.razor",
               "ToolTip": "E:\\ollama_net\\ollama\\AuthorBuddy.Web\\Components\\Layout\\MainLayout.razor",
               "RelativeToolTip": "Components\\Layout\\MainLayout.razor",
-              "ViewState": "AgIAADIAAAAAAAAAAAApwEUAAAByAAAAAAAAAA==",
+              "ViewState": "AgIAADMAAAAAAAAAAAApwEYAAAByAAAAAAAAAA==",
               "Icon": "ae27a6b0-e345-4288-96df-5eaf394ee369.000759|",
               "WhenOpened": "2026-05-15T16:04:36.444Z",
               "EditorCaption": ""
@@ -310,8 +309,7 @@
               "RelativeToolTip": "Components\\Pages\\Settings.razor",
               "ViewState": "AgIAABIAAAAAAAAAAAAAADMAAAAfAAAAAAAAAA==",
               "Icon": "ae27a6b0-e345-4288-96df-5eaf394ee369.000759|",
-              "WhenOpened": "2026-05-15T16:43:26.6Z",
-              "EditorCaption": ""
+              "WhenOpened": "2026-05-15T16:43:26.6Z"
             },
             {
               "$type": "Document",
diff --git a/Components/Layout/MainLayout.razor b/Components/Layout/MainLayout.razor
index 0ee63c9..230d4eb 100644
--- a/Components/Layout/MainLayout.razor
+++ b/Components/Layout/MainLayout.razor
@@ -29,7 +29,8 @@ else
     <div class="main-content">
         @if (_isAuthenticated)
         {
-        <aside class="sidebar">
+        <aside class="sidebar @(_showMobileSidebar ? "mobile-visible" : "")">
+            <div class="mobile-sidebar-close" @onclick="CloseMobileSidebar">✕</div>
             <div class="sidebar-logo">
                 <img src="/Assets/logo.jpg" alt="Author Buddy" />
             </div>
@@ -343,6 +344,14 @@ else
         </aside>
         }
 
+        @if (_isAuthenticated)
+        {
+            <button class="hamburger" @onclick="ToggleMobileSidebar">☰</button>
+        }
+        @if (_showMobileSidebar)
+        {
+            <div class="mobile-sidebar-backdrop" @onclick="CloseMobileSidebar"></div>
+        }
         <main class="detail-panel">
             @if (currentProjectId > 0)
             {
@@ -452,6 +461,7 @@ else
     private string newFileName = string.Empty;
     private FileTreeItem? newFileParentDir;
     private bool showCopyProjectDialog;
+    private bool _showMobileSidebar;
     private Action? _opStateHandler;
     private string? _editingCategoryPath;
     private HashSet<string> _selectedFiles = new();
@@ -710,9 +720,20 @@ else
     private void NavigateTo(string path)
     {
         activeSection = null;
+        _showMobileSidebar = false;
         Navigation.NavigateTo(path);
     }
 
+    private void ToggleMobileSidebar()
+    {
+        _showMobileSidebar = !_showMobileSidebar;
+    }
+
+    private void CloseMobileSidebar()
+    {
+        _showMobileSidebar = false;
+    }
+
     private void ToggleInfoOverlay()
     {
         _showInfoOverlay = !_showInfoOverlay;
diff --git a/Properties/PublishProfiles/FolderProfile.pubxml.user b/Properties/PublishProfiles/FolderProfile.pubxml.user
index 6d58bf2..93074be 100644
--- a/Properties/PublishProfiles/FolderProfile.pubxml.user
+++ b/Properties/PublishProfiles/FolderProfile.pubxml.user
@@ -3,7 +3,7 @@
 <Project>
   <PropertyGroup>
     <_PublishTargetUrl>E:\ollama_net\ollama\AuthorBuddy.Web\bin\Release\net10.0\publish\</_PublishTargetUrl>
-    <History>True|2026-07-04T08:31:55.1105019Z||;True|2026-07-03T19:42:19.2725521+02:00||;True|2026-07-03T19:14:41.2291817+02:00||;True|2026-06-26T17:29:16.2419779+02:00||;True|2026-06-14T08:09:44.9432726+02:00||;</History>
+    <History>True|2026-07-05T05:05:59.5910017Z||;True|2026-07-04T10:31:55.1105019+02:00||;True|2026-07-03T19:42:19.2725521+02:00||;True|2026-07-03T19:14:41.2291817+02:00||;True|2026-06-26T17:29:16.2419779+02:00||;True|2026-06-14T08:09:44.9432726+02:00||;</History>
     <LastFailureDetails />
   </PropertyGroup>
 </Project>
\ No newline at end of file
diff --git a/wwwroot/app.css b/wwwroot/app.css
index b16e362..f464c39 100644
--- a/wwwroot/app.css
+++ b/wwwroot/app.css
@@ -1237,6 +1237,37 @@ button.primary {
     border-color: var(--accent-color);
 }
 
+/* Hamburger menu */
+.hamburger {
+    display: none;
+    align-self: flex-start;
+    flex-shrink: 0;
+    z-index: 1100;
+    font-size: 24px;
+    width: 40px;
+    height: 40px;
+    border: none;
+    background: var(--button-bg);
+    color: var(--text-main);
+    cursor: pointer;
+    border-radius: 4px;
+    line-height: 40px;
+    text-align: center;
+    margin: 6px;
+}
+
+.hamburger:hover {
+    background: var(--button-hover);
+}
+
+.mobile-sidebar-backdrop {
+    display: none;
+}
+
+.mobile-sidebar-close {
+    display: none;
+}
+
 /* Editor modified badge */
 .editor-modified-badge {
     color: #e74c3c;
@@ -1765,10 +1796,59 @@ button.primary {
         overflow: auto;
     }
 
+    .hamburger {
+        display: inline-flex;
+        align-items: center;
+        justify-content: center;
+    }
+
+    .mobile-sidebar-backdrop {
+        display: block;
+    }
+
     .sidebar {
         display: none;
     }
 
+    .mobile-sidebar-close {
+        display: block;
+        position: absolute;
+        top: 6px;
+        right: 6px;
+        z-index: 1060;
+        font-size: 20px;
+        width: 32px;
+        height: 32px;
+        border: none;
+        background: transparent;
+        color: var(--text-main);
+        cursor: pointer;
+        border-radius: 4px;
+        line-height: 32px;
+        text-align: center;
+    }
+
+    .mobile-sidebar-close:hover {
+        background: var(--button-hover);
+    }
+
+    .sidebar.mobile-visible {
+        display: flex;
+        flex-direction: column;
+        position: fixed;
+        top: 0;
+        left: 0;
+        bottom: 0;
+        z-index: 1050;
+        width: 280px;
+        max-width: 85vw;
+        min-width: 200px;
+        border-right: 2px solid var(--border-color);
+        background: var(--window-bg);
+        padding: 4px;
+        overflow-y: auto;
+    }
+
     .main-content {
         flex-direction: column;
     }