diff --git a/apps/ui/src/components/layout/sidebar.tsx b/apps/ui/src/components/layout/sidebar.tsx
index 2933453a..a8c70cb6 100644
--- a/apps/ui/src/components/layout/sidebar.tsx
+++ b/apps/ui/src/components/layout/sidebar.tsx
@@ -257,110 +257,122 @@ export function Sidebar() {
   };
 
   return (
-    <aside
-      className={cn(
-        'flex-shrink-0 flex flex-col z-30 relative',
-        // Glass morphism background with gradient
-        'bg-gradient-to-b from-sidebar/95 via-sidebar/85 to-sidebar/90 backdrop-blur-2xl',
-        // Premium border with subtle glow
-        'border-r border-border/60 shadow-[1px_0_20px_-5px_rgba(0,0,0,0.1)]',
-        // Smooth width transition
-        'transition-all duration-300 ease-[cubic-bezier(0.4,0,0.2,1)]',
-        sidebarOpen ? 'w-16 lg:w-72' : 'w-16'
+    <>
+      {/* Mobile overlay backdrop */}
+      {sidebarOpen && (
+        <div
+          className="fixed inset-0 bg-black/50 z-40 lg:hidden"
+          onClick={toggleSidebar}
+          aria-hidden="true"
+        />
       )}
-      data-testid="sidebar"
-    >
-      <CollapseToggleButton
-        sidebarOpen={sidebarOpen}
-        toggleSidebar={toggleSidebar}
-        shortcut={shortcuts.toggleSidebar}
-      />
-
-      <div className="flex-1 flex flex-col overflow-hidden">
-        <SidebarHeader sidebarOpen={sidebarOpen} navigate={navigate} />
-
-        <ProjectSelectorWithOptions
+      <aside
+        className={cn(
+          'flex-shrink-0 flex flex-col z-50 relative',
+          // Glass morphism background with gradient
+          'bg-gradient-to-b from-sidebar/95 via-sidebar/85 to-sidebar/90 backdrop-blur-2xl',
+          // Premium border with subtle glow
+          'border-r border-border/60 shadow-[1px_0_20px_-5px_rgba(0,0,0,0.1)]',
+          // Smooth width transition
+          'transition-all duration-300 ease-[cubic-bezier(0.4,0,0.2,1)]',
+          // Mobile: hidden when closed, full width overlay when open
+          // Desktop: always visible, toggle between narrow and wide
+          sidebarOpen ? 'fixed lg:relative left-0 top-0 h-full w-72' : 'hidden lg:flex w-16'
+        )}
+        data-testid="sidebar"
+      >
+        <CollapseToggleButton
           sidebarOpen={sidebarOpen}
-          isProjectPickerOpen={isProjectPickerOpen}
-          setIsProjectPickerOpen={setIsProjectPickerOpen}
-          setShowDeleteProjectDialog={setShowDeleteProjectDialog}
+          toggleSidebar={toggleSidebar}
+          shortcut={shortcuts.toggleSidebar}
         />
 
-        <SidebarNavigation
-          currentProject={currentProject}
+        <div className="flex-1 flex flex-col overflow-hidden">
+          <SidebarHeader sidebarOpen={sidebarOpen} navigate={navigate} />
+
+          <ProjectSelectorWithOptions
+            sidebarOpen={sidebarOpen}
+            isProjectPickerOpen={isProjectPickerOpen}
+            setIsProjectPickerOpen={setIsProjectPickerOpen}
+            setShowDeleteProjectDialog={setShowDeleteProjectDialog}
+          />
+
+          <SidebarNavigation
+            currentProject={currentProject}
+            sidebarOpen={sidebarOpen}
+            navSections={navSections}
+            isActiveRoute={isActiveRoute}
+            navigate={navigate}
+          />
+        </div>
+
+        <SidebarFooter
           sidebarOpen={sidebarOpen}
-          navSections={navSections}
           isActiveRoute={isActiveRoute}
           navigate={navigate}
+          hideWiki={hideWiki}
+          hideRunningAgents={hideRunningAgents}
+          runningAgentsCount={runningAgentsCount}
+          shortcuts={{ settings: shortcuts.settings }}
+        />
+        <TrashDialog
+          open={showTrashDialog}
+          onOpenChange={setShowTrashDialog}
+          trashedProjects={trashedProjects}
+          activeTrashId={activeTrashId}
+          handleRestoreProject={handleRestoreProject}
+          handleDeleteProjectFromDisk={handleDeleteProjectFromDisk}
+          deleteTrashedProject={deleteTrashedProject}
+          handleEmptyTrash={handleEmptyTrash}
+          isEmptyingTrash={isEmptyingTrash}
         />
-      </div>
 
-      <SidebarFooter
-        sidebarOpen={sidebarOpen}
-        isActiveRoute={isActiveRoute}
-        navigate={navigate}
-        hideWiki={hideWiki}
-        hideRunningAgents={hideRunningAgents}
-        runningAgentsCount={runningAgentsCount}
-        shortcuts={{ settings: shortcuts.settings }}
-      />
-      <TrashDialog
-        open={showTrashDialog}
-        onOpenChange={setShowTrashDialog}
-        trashedProjects={trashedProjects}
-        activeTrashId={activeTrashId}
-        handleRestoreProject={handleRestoreProject}
-        handleDeleteProjectFromDisk={handleDeleteProjectFromDisk}
-        deleteTrashedProject={deleteTrashedProject}
-        handleEmptyTrash={handleEmptyTrash}
-        isEmptyingTrash={isEmptyingTrash}
-      />
+        {/* New Project Setup Dialog */}
+        <CreateSpecDialog
+          open={showSetupDialog}
+          onOpenChange={setShowSetupDialog}
+          projectOverview={projectOverview}
+          onProjectOverviewChange={setProjectOverview}
+          generateFeatures={generateFeatures}
+          onGenerateFeaturesChange={setGenerateFeatures}
+          analyzeProject={analyzeProject}
+          onAnalyzeProjectChange={setAnalyzeProject}
+          featureCount={featureCount}
+          onFeatureCountChange={setFeatureCount}
+          onCreateSpec={handleCreateInitialSpec}
+          onSkip={handleSkipSetup}
+          isCreatingSpec={isCreatingSpec}
+          showSkipButton={true}
+          title="Set Up Your Project"
+          description="We didn't find an app_spec.txt file. Let us help you generate your app_spec.txt to help describe your project for our system. We'll analyze your project's tech stack and create a comprehensive specification."
+        />
 
-      {/* New Project Setup Dialog */}
-      <CreateSpecDialog
-        open={showSetupDialog}
-        onOpenChange={setShowSetupDialog}
-        projectOverview={projectOverview}
-        onProjectOverviewChange={setProjectOverview}
-        generateFeatures={generateFeatures}
-        onGenerateFeaturesChange={setGenerateFeatures}
-        analyzeProject={analyzeProject}
-        onAnalyzeProjectChange={setAnalyzeProject}
-        featureCount={featureCount}
-        onFeatureCountChange={setFeatureCount}
-        onCreateSpec={handleCreateInitialSpec}
-        onSkip={handleSkipSetup}
-        isCreatingSpec={isCreatingSpec}
-        showSkipButton={true}
-        title="Set Up Your Project"
-        description="We didn't find an app_spec.txt file. Let us help you generate your app_spec.txt to help describe your project for our system. We'll analyze your project's tech stack and create a comprehensive specification."
-      />
+        <OnboardingDialog
+          open={showOnboardingDialog}
+          onOpenChange={setShowOnboardingDialog}
+          newProjectName={newProjectName}
+          onSkip={handleOnboardingSkip}
+          onGenerateSpec={handleOnboardingGenerateSpec}
+        />
 
-      <OnboardingDialog
-        open={showOnboardingDialog}
-        onOpenChange={setShowOnboardingDialog}
-        newProjectName={newProjectName}
-        onSkip={handleOnboardingSkip}
-        onGenerateSpec={handleOnboardingGenerateSpec}
-      />
+        {/* Delete Project Confirmation Dialog */}
+        <DeleteProjectDialog
+          open={showDeleteProjectDialog}
+          onOpenChange={setShowDeleteProjectDialog}
+          project={currentProject}
+          onConfirm={moveProjectToTrash}
+        />
 
-      {/* Delete Project Confirmation Dialog */}
-      <DeleteProjectDialog
-        open={showDeleteProjectDialog}
-        onOpenChange={setShowDeleteProjectDialog}
-        project={currentProject}
-        onConfirm={moveProjectToTrash}
-      />
-
-      {/* New Project Modal */}
-      <NewProjectModal
-        open={showNewProjectModal}
-        onOpenChange={setShowNewProjectModal}
-        onCreateBlankProject={handleCreateBlankProject}
-        onCreateFromTemplate={handleCreateFromTemplate}
-        onCreateFromCustomUrl={handleCreateFromCustomUrl}
-        isCreating={isCreatingProject}
-      />
-    </aside>
+        {/* New Project Modal */}
+        <NewProjectModal
+          open={showNewProjectModal}
+          onOpenChange={setShowNewProjectModal}
+          onCreateBlankProject={handleCreateBlankProject}
+          onCreateFromTemplate={handleCreateFromTemplate}
+          onCreateFromCustomUrl={handleCreateFromCustomUrl}
+          isCreating={isCreatingProject}
+        />
+      </aside>
+    </>
   );
 }
diff --git a/apps/ui/src/components/layout/sidebar/components/automaker-logo.tsx b/apps/ui/src/components/layout/sidebar/components/automaker-logo.tsx
index baacbf4e..92b7af99 100644
--- a/apps/ui/src/components/layout/sidebar/components/automaker-logo.tsx
+++ b/apps/ui/src/components/layout/sidebar/components/automaker-logo.tsx
@@ -35,11 +35,11 @@ export function AutomakerLogo({ sidebarOpen, navigate }: AutomakerLogoProps) {
       onClick={() => navigate({ to: '/dashboard' })}
       data-testid="logo-button"
     >
-      {/* Collapsed logo - shown when sidebar is closed OR on small screens when sidebar is open */}
+      {/* Collapsed logo - only shown when sidebar is closed */}
       <div
         className={cn(
           'relative flex flex-col items-center justify-center rounded-lg gap-0.5',
-          sidebarOpen ? 'flex lg:hidden' : 'flex'
+          sidebarOpen ? 'hidden' : 'flex'
         )}
       >
         <svg
@@ -90,16 +90,16 @@ export function AutomakerLogo({ sidebarOpen, navigate }: AutomakerLogoProps) {
         </span>
       </div>
 
-      {/* Expanded logo - only shown when sidebar is open on large screens */}
+      {/* Expanded logo - shown when sidebar is open */}
       {sidebarOpen && (
-        <div className="hidden lg:flex flex-col">
+        <div className="flex flex-col">
           <div className="flex items-center gap-1">
             <svg
               xmlns="http://www.w3.org/2000/svg"
               viewBox="0 0 256 256"
               role="img"
               aria-label="automaker"
-              className="h-[36.8px] w-[36.8px] group-hover:rotate-12 transition-transform duration-300 ease-out"
+              className="h-8 w-8 lg:h-[36.8px] lg:w-[36.8px] shrink-0 group-hover:rotate-12 transition-transform duration-300 ease-out"
             >
               <defs>
                 <linearGradient
@@ -137,11 +137,11 @@ export function AutomakerLogo({ sidebarOpen, navigate }: AutomakerLogoProps) {
                 <path d="M164 92 L204 128 L164 164" />
               </g>
             </svg>
-            <span className="font-bold text-foreground text-[1.7rem] tracking-tight leading-none translate-y-[-2px]">
+            <span className="font-bold text-foreground text-xl lg:text-[1.7rem] tracking-tight leading-none translate-y-[-2px]">
               automaker<span className="text-brand-500">.</span>
             </span>
           </div>
-          <span className="text-[0.625rem] text-muted-foreground leading-none font-medium ml-[38.8px]">
+          <span className="text-[0.625rem] text-muted-foreground leading-none font-medium ml-9 lg:ml-[38.8px]">
             v{appVersion} {versionSuffix}
           </span>
         </div>
diff --git a/apps/ui/src/components/layout/sidebar/components/collapse-toggle-button.tsx b/apps/ui/src/components/layout/sidebar/components/collapse-toggle-button.tsx
index 4c09056b..fc33f6ed 100644
--- a/apps/ui/src/components/layout/sidebar/components/collapse-toggle-button.tsx
+++ b/apps/ui/src/components/layout/sidebar/components/collapse-toggle-button.tsx
@@ -17,7 +17,9 @@ export function CollapseToggleButton({
     <button
       onClick={toggleSidebar}
       className={cn(
-        'hidden lg:flex absolute top-[68px] -right-3 z-9999',
+        // Show on desktop always, show on mobile only when sidebar is open
+        sidebarOpen ? 'flex' : 'hidden lg:flex',
+        'absolute top-[68px] -right-3 z-9999',
         'group/toggle items-center justify-center w-7 h-7 rounded-full',
         // Glass morphism button
         'bg-card/95 backdrop-blur-sm border border-border/80',
diff --git a/apps/ui/src/components/layout/sidebar/components/project-selector-with-options.tsx b/apps/ui/src/components/layout/sidebar/components/project-selector-with-options.tsx
index b33a7b6d..d0e8ac0d 100644
--- a/apps/ui/src/components/layout/sidebar/components/project-selector-with-options.tsx
+++ b/apps/ui/src/components/layout/sidebar/components/project-selector-with-options.tsx
@@ -117,7 +117,7 @@ export function ProjectSelectorWithOptions({
             </div>
             <div className="flex items-center gap-1.5">
               <span
-                className="hidden lg:flex items-center justify-center min-w-5 h-5 px-1.5 text-[10px] font-mono rounded-md bg-muted text-muted-foreground"
+                className="hidden sm:flex items-center justify-center min-w-5 h-5 px-1.5 text-[10px] font-mono rounded-md bg-muted text-muted-foreground"
                 data-testid="project-picker-shortcut"
               >
                 {formatShortcut(shortcuts.projectPicker, true)}
@@ -219,7 +219,7 @@ export function ProjectSelectorWithOptions({
           <DropdownMenuTrigger asChild>
             <button
               className={cn(
-                'hidden lg:flex items-center justify-center w-[42px] h-[42px] rounded-lg',
+                'flex items-center justify-center w-[42px] h-[42px] rounded-lg',
                 'text-muted-foreground hover:text-foreground',
                 'bg-transparent hover:bg-accent/60',
                 'border border-border/50 hover:border-border',
diff --git a/apps/ui/src/components/layout/sidebar/components/sidebar-footer.tsx b/apps/ui/src/components/layout/sidebar/components/sidebar-footer.tsx
index 664797b6..38381836 100644
--- a/apps/ui/src/components/layout/sidebar/components/sidebar-footer.tsx
+++ b/apps/ui/src/components/layout/sidebar/components/sidebar-footer.tsx
@@ -72,7 +72,7 @@ export function SidebarFooter({
             <span
               className={cn(
                 'ml-3 font-medium text-sm flex-1 text-left',
-                sidebarOpen ? 'hidden lg:block' : 'hidden'
+                sidebarOpen ? 'block' : 'hidden'
               )}
             >
               Wiki
@@ -148,7 +148,7 @@ export function SidebarFooter({
             <span
               className={cn(
                 'ml-3 font-medium text-sm flex-1 text-left',
-                sidebarOpen ? 'hidden lg:block' : 'hidden'
+                sidebarOpen ? 'block' : 'hidden'
               )}
             >
               Running Agents
@@ -157,7 +157,7 @@ export function SidebarFooter({
             {sidebarOpen && runningAgentsCount > 0 && (
               <span
                 className={cn(
-                  'hidden lg:flex items-center justify-center',
+                  'flex items-center justify-center',
                   'min-w-6 h-6 px-1.5 text-xs font-semibold rounded-full',
                   'bg-brand-500 text-white shadow-sm',
                   'animate-in fade-in zoom-in duration-200',
@@ -227,7 +227,7 @@ export function SidebarFooter({
           <span
             className={cn(
               'ml-3 font-medium text-sm flex-1 text-left',
-              sidebarOpen ? 'hidden lg:block' : 'hidden'
+              sidebarOpen ? 'block' : 'hidden'
             )}
           >
             Settings
@@ -235,7 +235,7 @@ export function SidebarFooter({
           {sidebarOpen && (
             <span
               className={cn(
-                'hidden lg:flex items-center justify-center min-w-5 h-5 px-1.5 text-[10px] font-mono rounded-md transition-all duration-200',
+                'hidden sm:flex items-center justify-center min-w-5 h-5 px-1.5 text-[10px] font-mono rounded-md transition-all duration-200',
                 isActiveRoute('settings')
                   ? 'bg-brand-500/20 text-brand-400'
                   : 'bg-muted text-muted-foreground group-hover:bg-accent'
diff --git a/apps/ui/src/components/layout/sidebar/components/sidebar-header.tsx b/apps/ui/src/components/layout/sidebar/components/sidebar-header.tsx
index bd47d9d2..c5f76355 100644
--- a/apps/ui/src/components/layout/sidebar/components/sidebar-header.tsx
+++ b/apps/ui/src/components/layout/sidebar/components/sidebar-header.tsx
@@ -20,9 +20,9 @@ export function SidebarHeader({ sidebarOpen, navigate }: SidebarHeaderProps) {
           // Background gradient for depth
           'bg-gradient-to-b from-transparent to-background/5',
           'flex items-center',
-          sidebarOpen ? 'px-3 lg:px-5 justify-start' : 'px-3 justify-center',
-          // Add left padding on macOS to avoid overlapping with traffic light buttons (only when expanded)
-          isMac && sidebarOpen && 'pt-4 pl-20',
+          sidebarOpen ? 'px-4 lg:px-5 justify-start' : 'px-3 justify-center',
+          // Add padding on macOS to avoid overlapping with traffic light buttons
+          isMac && sidebarOpen && 'pt-4',
           // Smaller top padding on macOS when collapsed
           isMac && !sidebarOpen && 'pt-4'
         )}
diff --git a/apps/ui/src/components/layout/sidebar/components/sidebar-navigation.tsx b/apps/ui/src/components/layout/sidebar/components/sidebar-navigation.tsx
index 825db5cd..f587aafc 100644
--- a/apps/ui/src/components/layout/sidebar/components/sidebar-navigation.tsx
+++ b/apps/ui/src/components/layout/sidebar/components/sidebar-navigation.tsx
@@ -35,7 +35,7 @@ export function SidebarNavigation({
           <div key={sectionIdx} className={sectionIdx > 0 && sidebarOpen ? 'mt-6' : ''}>
             {/* Section Label */}
             {section.label && sidebarOpen && (
-              <div className="hidden lg:block px-3 mb-2">
+              <div className="px-3 mb-2">
                 <span className="text-[10px] font-semibold text-muted-foreground/70 uppercase tracking-widest">
                   {section.label}
                 </span>
@@ -115,7 +115,7 @@ export function SidebarNavigation({
                     <span
                       className={cn(
                         'ml-3 font-medium text-sm flex-1 text-left',
-                        sidebarOpen ? 'hidden lg:block' : 'hidden'
+                        sidebarOpen ? 'block' : 'hidden'
                       )}
                     >
                       {item.label}
@@ -124,7 +124,7 @@ export function SidebarNavigation({
                     {item.count !== undefined && item.count > 0 && sidebarOpen && (
                       <span
                         className={cn(
-                          'hidden lg:flex items-center justify-center',
+                          'flex items-center justify-center',
                           'min-w-5 h-5 px-1.5 text-[10px] font-bold rounded-full',
                           'bg-primary text-primary-foreground shadow-sm',
                           'animate-in fade-in zoom-in duration-200'
@@ -137,7 +137,7 @@ export function SidebarNavigation({
                     {item.shortcut && sidebarOpen && !item.count && (
                       <span
                         className={cn(
-                          'hidden lg:flex items-center justify-center min-w-5 h-5 px-1.5 text-[10px] font-mono rounded-md transition-all duration-200',
+                          'hidden sm:flex items-center justify-center min-w-5 h-5 px-1.5 text-[10px] font-mono rounded-md transition-all duration-200',
                           isActive
                             ? 'bg-brand-500/20 text-brand-400'
                             : 'bg-muted text-muted-foreground group-hover:bg-accent'
diff --git a/apps/ui/src/components/views/dashboard-view.tsx b/apps/ui/src/components/views/dashboard-view.tsx
index b49755d0..734a3757 100644
--- a/apps/ui/src/components/views/dashboard-view.tsx
+++ b/apps/ui/src/components/views/dashboard-view.tsx
@@ -472,9 +472,9 @@ export function DashboardView() {
             aria-hidden="true"
           />
         )}
-        <div className="px-8 py-4 flex items-center justify-between">
+        <div className="px-4 sm:px-8 py-4 flex items-center justify-between">
           <div
-            className="flex items-center gap-3 cursor-pointer group titlebar-no-drag"
+            className="flex items-center gap-2 sm:gap-3 cursor-pointer group titlebar-no-drag"
             onClick={() => navigate({ to: '/dashboard' })}
           >
             <svg
@@ -482,7 +482,7 @@ export function DashboardView() {
               viewBox="0 0 256 256"
               role="img"
               aria-label="Automaker Logo"
-              className="size-10 group-hover:rotate-12 transition-transform duration-300 ease-out"
+              className="size-8 sm:size-10 group-hover:rotate-12 transition-transform duration-300 ease-out"
             >
               <defs>
                 <linearGradient
@@ -521,7 +521,7 @@ export function DashboardView() {
               </g>
             </svg>
             <div className="flex flex-col">
-              <span className="font-bold text-foreground text-2xl tracking-tight leading-none">
+              <span className="font-bold text-foreground text-xl sm:text-2xl tracking-tight leading-none">
                 automaker<span className="text-brand-500">.</span>
               </span>
               <span className="text-xs text-muted-foreground leading-none font-medium mt-1">
@@ -541,30 +541,32 @@ export function DashboardView() {
       </header>
 
       {/* Main content */}
-      <div className="flex-1 overflow-y-auto p-8">
+      <div className="flex-1 overflow-y-auto p-4 sm:p-8">
         <div className="max-w-6xl mx-auto">
           {/* No projects - show getting started */}
           {!hasProjects && (
             <div className="animate-in fade-in slide-in-from-bottom-4 duration-500">
-              <div className="text-center mb-12">
-                <h2 className="text-3xl font-bold text-foreground mb-3">Welcome to Automaker</h2>
-                <p className="text-lg text-muted-foreground max-w-xl mx-auto">
+              <div className="text-center mb-8 sm:mb-12">
+                <h2 className="text-2xl sm:text-3xl font-bold text-foreground mb-3">
+                  Welcome to Automaker
+                </h2>
+                <p className="text-base sm:text-lg text-muted-foreground max-w-xl mx-auto px-2">
                   Your autonomous AI development studio. Get started by creating a new project or
                   opening an existing one.
                 </p>
               </div>
 
-              <div className="grid grid-cols-1 md:grid-cols-2 gap-6 max-w-3xl mx-auto">
+              <div className="grid grid-cols-1 md:grid-cols-2 gap-4 sm:gap-6 max-w-3xl mx-auto">
                 {/* New Project Card */}
                 <div
                   className="group relative rounded-xl border border-border bg-card/80 backdrop-blur-sm hover:bg-card hover:border-brand-500/30 hover:shadow-xl hover:shadow-brand-500/5 transition-all duration-300 hover:-translate-y-1"
                   data-testid="new-project-card"
                 >
                   <div className="absolute inset-0 rounded-xl bg-linear-to-br from-brand-500/5 via-transparent to-purple-600/5 opacity-0 group-hover:opacity-100 transition-opacity duration-300" />
-                  <div className="relative p-6 h-full flex flex-col">
-                    <div className="flex items-start gap-4 flex-1">
-                      <div className="w-12 h-12 rounded-xl bg-linear-to-br from-brand-500 to-brand-600 shadow-lg shadow-brand-500/25 flex items-center justify-center group-hover:scale-105 group-hover:shadow-brand-500/40 transition-all duration-300 shrink-0">
-                        <Plus className="w-6 h-6 text-white" />
+                  <div className="relative p-4 sm:p-6 h-full flex flex-col">
+                    <div className="flex items-start gap-3 sm:gap-4 flex-1">
+                      <div className="w-10 h-10 sm:w-12 sm:h-12 rounded-xl bg-linear-to-br from-brand-500 to-brand-600 shadow-lg shadow-brand-500/25 flex items-center justify-center group-hover:scale-105 group-hover:shadow-brand-500/40 transition-all duration-300 shrink-0">
+                        <Plus className="w-5 h-5 sm:w-6 sm:h-6 text-white" />
                       </div>
                       <div className="flex-1 min-w-0">
                         <h3 className="text-lg font-semibold text-foreground mb-1.5">
@@ -578,7 +580,7 @@ export function DashboardView() {
                     <DropdownMenu>
                       <DropdownMenuTrigger asChild>
                         <Button
-                          className="w-full mt-5 bg-linear-to-r from-brand-500 to-brand-600 hover:from-brand-600 hover:to-brand-700 text-white border-0 shadow-md shadow-brand-500/20 hover:shadow-brand-500/30 transition-all"
+                          className="w-full mt-4 sm:mt-5 bg-linear-to-r from-brand-500 to-brand-600 hover:from-brand-600 hover:to-brand-700 text-white border-0 shadow-md shadow-brand-500/20 hover:shadow-brand-500/30 transition-all"
                           data-testid="create-new-project"
                         >
                           <Plus className="w-4 h-4 mr-2" />
@@ -613,10 +615,10 @@ export function DashboardView() {
                   data-testid="open-project-card"
                 >
                   <div className="absolute inset-0 rounded-xl bg-linear-to-br from-blue-500/5 via-transparent to-cyan-600/5 opacity-0 group-hover:opacity-100 transition-opacity duration-300" />
-                  <div className="relative p-6 h-full flex flex-col">
-                    <div className="flex items-start gap-4 flex-1">
-                      <div className="w-12 h-12 rounded-xl bg-muted border border-border flex items-center justify-center group-hover:bg-blue-500/10 group-hover:border-blue-500/30 group-hover:scale-105 transition-all duration-300 shrink-0">
-                        <FolderOpen className="w-6 h-6 text-muted-foreground group-hover:text-blue-500 transition-colors duration-300" />
+                  <div className="relative p-4 sm:p-6 h-full flex flex-col">
+                    <div className="flex items-start gap-3 sm:gap-4 flex-1">
+                      <div className="w-10 h-10 sm:w-12 sm:h-12 rounded-xl bg-muted border border-border flex items-center justify-center group-hover:bg-blue-500/10 group-hover:border-blue-500/30 group-hover:scale-105 transition-all duration-300 shrink-0">
+                        <FolderOpen className="w-5 h-5 sm:w-6 sm:h-6 text-muted-foreground group-hover:text-blue-500 transition-colors duration-300" />
                       </div>
                       <div className="flex-1 min-w-0">
                         <h3 className="text-lg font-semibold text-foreground mb-1.5">
@@ -629,7 +631,7 @@ export function DashboardView() {
                     </div>
                     <Button
                       variant="secondary"
-                      className="w-full mt-5 bg-secondary/80 hover:bg-secondary text-foreground border border-border hover:border-blue-500/30 transition-all"
+                      className="w-full mt-4 sm:mt-5 bg-secondary/80 hover:bg-secondary text-foreground border border-border hover:border-blue-500/30 transition-all"
                       data-testid="open-existing-project"
                     >
                       <FolderOpen className="w-4 h-4 mr-2" />
@@ -643,21 +645,26 @@ export function DashboardView() {
 
           {/* Has projects - show project list */}
           {hasProjects && (
-            <div className="space-y-8 animate-in fade-in slide-in-from-bottom-4 duration-500">
+            <div className="space-y-6 sm:space-y-8 animate-in fade-in slide-in-from-bottom-4 duration-500">
               {/* Quick actions header */}
-              <div className="flex items-center justify-between">
+              <div className="flex flex-col sm:flex-row sm:items-center sm:justify-between gap-4">
                 <h2 className="text-2xl font-bold text-foreground">Your Projects</h2>
                 <div className="flex gap-2">
-                  <Button variant="outline" onClick={handleOpenProject}>
-                    <FolderOpen className="w-4 h-4 mr-2" />
-                    Open Folder
+                  <Button
+                    variant="outline"
+                    onClick={handleOpenProject}
+                    className="flex-1 sm:flex-none"
+                  >
+                    <FolderOpen className="w-4 h-4 sm:mr-2" />
+                    <span className="hidden sm:inline">Open Folder</span>
                   </Button>
                   <DropdownMenu>
                     <DropdownMenuTrigger asChild>
-                      <Button className="bg-linear-to-r from-brand-500 to-brand-600 hover:from-brand-600 hover:to-brand-700 text-white">
-                        <Plus className="w-4 h-4 mr-2" />
-                        New Project
-                        <ChevronDown className="w-4 h-4 ml-2" />
+                      <Button className="flex-1 sm:flex-none bg-linear-to-r from-brand-500 to-brand-600 hover:from-brand-600 hover:to-brand-700 text-white">
+                        <Plus className="w-4 h-4 sm:mr-2" />
+                        <span className="hidden sm:inline">New Project</span>
+                        <span className="sm:hidden">New</span>
+                        <ChevronDown className="w-4 h-4 ml-1 sm:ml-2" />
                       </Button>
                     </DropdownMenuTrigger>
                     <DropdownMenuContent align="end" className="w-56">
@@ -677,13 +684,15 @@ export function DashboardView() {
               {/* Favorites section */}
               {favoriteProjects.length > 0 && (
                 <div>
-                  <div className="flex items-center gap-2.5 mb-4">
-                    <div className="w-8 h-8 rounded-lg bg-yellow-500/10 flex items-center justify-center">
-                      <Star className="w-4 h-4 text-yellow-500 fill-yellow-500" />
+                  <div className="flex items-center gap-2 sm:gap-2.5 mb-3 sm:mb-4">
+                    <div className="w-7 h-7 sm:w-8 sm:h-8 rounded-lg bg-yellow-500/10 flex items-center justify-center">
+                      <Star className="w-3.5 h-3.5 sm:w-4 sm:h-4 text-yellow-500 fill-yellow-500" />
                     </div>
-                    <h3 className="text-lg font-semibold text-foreground">Favorites</h3>
+                    <h3 className="text-base sm:text-lg font-semibold text-foreground">
+                      Favorites
+                    </h3>
                   </div>
-                  <div className="grid grid-cols-1 md:grid-cols-2 lg:grid-cols-3 gap-4">
+                  <div className="grid grid-cols-1 md:grid-cols-2 lg:grid-cols-3 gap-3 sm:gap-4">
                     {favoriteProjects.map((project) => (
                       <div
                         key={project.id}
@@ -692,40 +701,40 @@ export function DashboardView() {
                         data-testid={`project-card-${project.id}`}
                       >
                         <div className="absolute inset-0 rounded-xl bg-linear-to-br from-yellow-500/5 to-amber-600/5 opacity-0 group-hover:opacity-100 transition-all duration-300" />
-                        <div className="relative p-4">
-                          <div className="flex items-start gap-3">
-                            <div className="w-10 h-10 rounded-lg bg-yellow-500/10 border border-yellow-500/30 flex items-center justify-center group-hover:bg-yellow-500/20 transition-all duration-300 shrink-0">
-                              <Folder className="w-5 h-5 text-yellow-500" />
+                        <div className="relative p-3 sm:p-4">
+                          <div className="flex items-start gap-2.5 sm:gap-3">
+                            <div className="w-9 h-9 sm:w-10 sm:h-10 rounded-lg bg-yellow-500/10 border border-yellow-500/30 flex items-center justify-center group-hover:bg-yellow-500/20 transition-all duration-300 shrink-0">
+                              <Folder className="w-4 h-4 sm:w-5 sm:h-5 text-yellow-500" />
                             </div>
                             <div className="flex-1 min-w-0">
-                              <p className="font-medium text-foreground truncate group-hover:text-yellow-500 transition-colors duration-300">
+                              <p className="text-sm sm:text-base font-medium text-foreground truncate group-hover:text-yellow-500 transition-colors duration-300">
                                 {project.name}
                               </p>
-                              <p className="text-xs text-muted-foreground/70 truncate mt-1">
+                              <p className="text-xs text-muted-foreground/70 truncate mt-0.5 sm:mt-1">
                                 {project.path}
                               </p>
                               {project.lastOpened && (
-                                <p className="text-xs text-muted-foreground mt-1.5">
+                                <p className="text-xs text-muted-foreground mt-1 sm:mt-1.5">
                                   {new Date(project.lastOpened).toLocaleDateString()}
                                 </p>
                               )}
                             </div>
-                            <div className="flex items-center gap-1">
+                            <div className="flex items-center gap-0.5 sm:gap-1">
                               <button
                                 onClick={(e) => handleToggleFavorite(e, project.id)}
-                                className="p-1.5 rounded-lg hover:bg-yellow-500/20 transition-colors"
+                                className="p-1 sm:p-1.5 rounded-lg hover:bg-yellow-500/20 transition-colors"
                                 title="Remove from favorites"
                               >
-                                <Star className="w-4 h-4 text-yellow-500 fill-yellow-500" />
+                                <Star className="w-3.5 h-3.5 sm:w-4 sm:h-4 text-yellow-500 fill-yellow-500" />
                               </button>
                               <DropdownMenu>
                                 <DropdownMenuTrigger asChild>
                                   <button
                                     onClick={(e) => e.stopPropagation()}
-                                    className="p-1.5 rounded-lg hover:bg-muted transition-colors opacity-0 group-hover:opacity-100"
+                                    className="p-1 sm:p-1.5 rounded-lg hover:bg-muted transition-colors opacity-0 group-hover:opacity-100"
                                     title="More options"
                                   >
-                                    <MoreVertical className="w-4 h-4 text-muted-foreground" />
+                                    <MoreVertical className="w-3.5 h-3.5 sm:w-4 sm:h-4 text-muted-foreground" />
                                   </button>
                                 </DropdownMenuTrigger>
                                 <DropdownMenuContent align="end">
@@ -750,13 +759,15 @@ export function DashboardView() {
               {/* Recent projects section */}
               {recentProjects.length > 0 && (
                 <div>
-                  <div className="flex items-center gap-2.5 mb-4">
-                    <div className="w-8 h-8 rounded-lg bg-muted/50 flex items-center justify-center">
-                      <Clock className="w-4 h-4 text-muted-foreground" />
+                  <div className="flex items-center gap-2 sm:gap-2.5 mb-3 sm:mb-4">
+                    <div className="w-7 h-7 sm:w-8 sm:h-8 rounded-lg bg-muted/50 flex items-center justify-center">
+                      <Clock className="w-3.5 h-3.5 sm:w-4 sm:h-4 text-muted-foreground" />
                     </div>
-                    <h3 className="text-lg font-semibold text-foreground">Recent Projects</h3>
+                    <h3 className="text-base sm:text-lg font-semibold text-foreground">
+                      Recent Projects
+                    </h3>
                   </div>
-                  <div className="grid grid-cols-1 md:grid-cols-2 lg:grid-cols-3 gap-4">
+                  <div className="grid grid-cols-1 md:grid-cols-2 lg:grid-cols-3 gap-3 sm:gap-4">
                     {recentProjects.map((project) => (
                       <div
                         key={project.id}
@@ -765,40 +776,40 @@ export function DashboardView() {
                         data-testid={`project-card-${project.id}`}
                       >
                         <div className="absolute inset-0 rounded-xl bg-linear-to-br from-brand-500/0 to-purple-600/0 group-hover:from-brand-500/5 group-hover:to-purple-600/5 transition-all duration-300" />
-                        <div className="relative p-4">
-                          <div className="flex items-start gap-3">
-                            <div className="w-10 h-10 rounded-lg bg-muted/80 border border-border flex items-center justify-center group-hover:bg-brand-500/10 group-hover:border-brand-500/30 transition-all duration-300 shrink-0">
-                              <Folder className="w-5 h-5 text-muted-foreground group-hover:text-brand-500 transition-colors duration-300" />
+                        <div className="relative p-3 sm:p-4">
+                          <div className="flex items-start gap-2.5 sm:gap-3">
+                            <div className="w-9 h-9 sm:w-10 sm:h-10 rounded-lg bg-muted/80 border border-border flex items-center justify-center group-hover:bg-brand-500/10 group-hover:border-brand-500/30 transition-all duration-300 shrink-0">
+                              <Folder className="w-4 h-4 sm:w-5 sm:h-5 text-muted-foreground group-hover:text-brand-500 transition-colors duration-300" />
                             </div>
                             <div className="flex-1 min-w-0">
-                              <p className="font-medium text-foreground truncate group-hover:text-brand-500 transition-colors duration-300">
+                              <p className="text-sm sm:text-base font-medium text-foreground truncate group-hover:text-brand-500 transition-colors duration-300">
                                 {project.name}
                               </p>
-                              <p className="text-xs text-muted-foreground/70 truncate mt-1">
+                              <p className="text-xs text-muted-foreground/70 truncate mt-0.5 sm:mt-1">
                                 {project.path}
                               </p>
                               {project.lastOpened && (
-                                <p className="text-xs text-muted-foreground mt-1.5">
+                                <p className="text-xs text-muted-foreground mt-1 sm:mt-1.5">
                                   {new Date(project.lastOpened).toLocaleDateString()}
                                 </p>
                               )}
                             </div>
-                            <div className="flex items-center gap-1">
+                            <div className="flex items-center gap-0.5 sm:gap-1">
                               <button
                                 onClick={(e) => handleToggleFavorite(e, project.id)}
-                                className="p-1.5 rounded-lg hover:bg-muted transition-colors opacity-0 group-hover:opacity-100"
+                                className="p-1 sm:p-1.5 rounded-lg hover:bg-muted transition-colors opacity-0 group-hover:opacity-100"
                                 title="Add to favorites"
                               >
-                                <Star className="w-4 h-4 text-muted-foreground hover:text-yellow-500" />
+                                <Star className="w-3.5 h-3.5 sm:w-4 sm:h-4 text-muted-foreground hover:text-yellow-500" />
                               </button>
                               <DropdownMenu>
                                 <DropdownMenuTrigger asChild>
                                   <button
                                     onClick={(e) => e.stopPropagation()}
-                                    className="p-1.5 rounded-lg hover:bg-muted transition-colors opacity-0 group-hover:opacity-100"
+                                    className="p-1 sm:p-1.5 rounded-lg hover:bg-muted transition-colors opacity-0 group-hover:opacity-100"
                                     title="More options"
                                   >
-                                    <MoreVertical className="w-4 h-4 text-muted-foreground" />
+                                    <MoreVertical className="w-3.5 h-3.5 sm:w-4 sm:h-4 text-muted-foreground" />
                                   </button>
                                 </DropdownMenuTrigger>
                                 <DropdownMenuContent align="end">
diff --git a/apps/ui/src/routes/__root.tsx b/apps/ui/src/routes/__root.tsx
index 6246b84e..74435498 100644
--- a/apps/ui/src/routes/__root.tsx
+++ b/apps/ui/src/routes/__root.tsx
@@ -27,6 +27,7 @@ import {
   performSettingsMigration,
 } from '@/hooks/use-settings-migration';
 import { Toaster } from 'sonner';
+import { Menu } from 'lucide-react';
 import { ThemeOption, themeOptions } from '@/config/theme-options';
 import { SandboxRiskDialog } from '@/components/dialogs/sandbox-risk-dialog';
 import { SandboxRejectionScreen } from '@/components/dialogs/sandbox-rejection-screen';
@@ -159,6 +160,8 @@ function RootLayoutContent() {
     skipSandboxWarning,
     setSkipSandboxWarning,
     fetchCodexModels,
+    sidebarOpen,
+    toggleSidebar,
   } = useAppStore();
   const { setupComplete, codexCliStatus } = useSetupStore();
   const navigate = useNavigate();
@@ -811,6 +814,16 @@ function RootLayoutContent() {
           />
         )}
         <Sidebar />
+        {/* Mobile menu toggle button - only shows when sidebar is closed on mobile */}
+        {!sidebarOpen && (
+          <button
+            onClick={toggleSidebar}
+            className="fixed top-3 left-3 z-50 p-2 rounded-lg bg-card/90 backdrop-blur-sm border border-border shadow-lg lg:hidden"
+            aria-label="Open menu"
+          >
+            <Menu className="w-5 h-5 text-foreground" />
+          </button>
+        )}
         <div
           className="flex-1 flex flex-col overflow-hidden transition-all duration-300"
           style={{ marginRight: streamerPanelOpen ? '250px' : '0' }}