diff --git a/apps/ui/src/components/views/agent-view/input-area/input-controls.tsx b/apps/ui/src/components/views/agent-view/input-area/input-controls.tsx
index efa1aafa..06d391af 100644
--- a/apps/ui/src/components/views/agent-view/input-area/input-controls.tsx
+++ b/apps/ui/src/components/views/agent-view/input-area/input-controls.tsx
@@ -79,7 +79,7 @@ export function InputControls({
       {/* Text Input and Controls */}
       <div
         className={cn(
-          'flex gap-2 transition-all duration-200 rounded-xl p-1',
+          'flex flex-col gap-2 transition-all duration-200 rounded-xl p-1',
           isDragOver && 'bg-primary/5 ring-2 ring-primary/30'
         )}
         onDragEnter={onDragEnter}
@@ -87,7 +87,8 @@ export function InputControls({
         onDragOver={onDragOver}
         onDrop={onDrop}
       >
-        <div className="flex-1 relative">
+        {/* Textarea - full width on mobile */}
+        <div className="relative w-full">
           <Textarea
             ref={inputRef}
             placeholder={
@@ -105,14 +106,14 @@ export function InputControls({
             data-testid="agent-input"
             rows={1}
             className={cn(
-              'min-h-11 bg-background border-border rounded-xl pl-4 pr-20 text-sm transition-all resize-none max-h-36 overflow-y-auto py-2.5',
+              'min-h-11 w-full bg-background border-border rounded-xl pl-4 pr-4 sm:pr-20 text-sm transition-all resize-none max-h-36 overflow-y-auto py-2.5',
               'focus:ring-2 focus:ring-primary/20 focus:border-primary/50',
               hasFiles && 'border-primary/30',
               isDragOver && 'border-primary bg-primary/5'
             )}
           />
           {hasFiles && !isDragOver && (
-            <div className="absolute right-3 top-1/2 -translate-y-1/2 text-xs bg-primary text-primary-foreground px-2 py-0.5 rounded-full font-medium">
+            <div className="hidden sm:block absolute right-3 top-1/2 -translate-y-1/2 text-xs bg-primary text-primary-foreground px-2 py-0.5 rounded-full font-medium">
               files attached
             </div>
           )}
@@ -124,58 +125,64 @@ export function InputControls({
           )}
         </div>
 
-        {/* Model Selector */}
-        <AgentModelSelector
-          value={modelSelection}
-          onChange={onModelSelect}
-          disabled={!isConnected}
-        />
-
-        {/* File Attachment Button */}
-        <Button
-          variant="outline"
-          size="icon"
-          onClick={onToggleImageDropZone}
-          disabled={!isConnected}
-          className={cn(
-            'h-11 w-11 rounded-xl border-border',
-            showImageDropZone && 'bg-primary/10 text-primary border-primary/30',
-            hasFiles && 'border-primary/30 text-primary'
-          )}
-          title="Attach files (images, .txt, .md)"
-        >
-          <Paperclip className="w-4 h-4" />
-        </Button>
-
-        {/* Stop Button (only when processing) */}
-        {isProcessing && (
-          <Button
-            onClick={onStop}
+        {/* Controls row - responsive layout */}
+        <div className="flex items-center gap-2 flex-wrap">
+          {/* Model Selector */}
+          <AgentModelSelector
+            value={modelSelection}
+            onChange={onModelSelect}
             disabled={!isConnected}
-            className="h-11 px-4 rounded-xl"
-            variant="destructive"
-            data-testid="stop-agent"
-            title="Stop generation"
-          >
-            <Square className="w-4 h-4 fill-current" />
-          </Button>
-        )}
+          />
 
-        {/* Send / Queue Button */}
-        <Button
-          onClick={onSend}
-          disabled={!canSend}
-          className="h-11 px-4 rounded-xl"
-          variant={isProcessing ? 'outline' : 'default'}
-          data-testid="send-message"
-          title={isProcessing ? 'Add to queue' : 'Send message'}
-        >
-          {isProcessing ? <ListOrdered className="w-4 h-4" /> : <Send className="w-4 h-4" />}
-        </Button>
+          {/* File Attachment Button */}
+          <Button
+            variant="outline"
+            size="icon"
+            onClick={onToggleImageDropZone}
+            disabled={!isConnected}
+            className={cn(
+              'h-11 w-11 rounded-xl border-border shrink-0',
+              showImageDropZone && 'bg-primary/10 text-primary border-primary/30',
+              hasFiles && 'border-primary/30 text-primary'
+            )}
+            title="Attach files (images, .txt, .md)"
+          >
+            <Paperclip className="w-4 h-4" />
+          </Button>
+
+          {/* Spacer to push action buttons to the right */}
+          <div className="flex-1" />
+
+          {/* Stop Button (only when processing) */}
+          {isProcessing && (
+            <Button
+              onClick={onStop}
+              disabled={!isConnected}
+              className="h-11 px-4 rounded-xl shrink-0"
+              variant="destructive"
+              data-testid="stop-agent"
+              title="Stop generation"
+            >
+              <Square className="w-4 h-4 fill-current" />
+            </Button>
+          )}
+
+          {/* Send / Queue Button */}
+          <Button
+            onClick={onSend}
+            disabled={!canSend}
+            className="h-11 px-4 rounded-xl shrink-0"
+            variant={isProcessing ? 'outline' : 'default'}
+            data-testid="send-message"
+            title={isProcessing ? 'Add to queue' : 'Send message'}
+          >
+            {isProcessing ? <ListOrdered className="w-4 h-4" /> : <Send className="w-4 h-4" />}
+          </Button>
+        </div>
       </div>
 
       {/* Keyboard hint */}
-      <p className="text-[11px] text-muted-foreground mt-2 text-center">
+      <p className="text-[11px] text-muted-foreground mt-2 text-center hidden sm:block">
         Press <kbd className="px-1.5 py-0.5 bg-muted rounded text-[10px] font-medium">Enter</kbd> to
         send,{' '}
         <kbd className="px-1.5 py-0.5 bg-muted rounded text-[10px] font-medium">Shift+Enter</kbd>{' '}
diff --git a/apps/ui/src/components/views/settings-view.tsx b/apps/ui/src/components/views/settings-view.tsx
index aa6a8a84..9dbfc942 100644
--- a/apps/ui/src/components/views/settings-view.tsx
+++ b/apps/ui/src/components/views/settings-view.tsx
@@ -1,4 +1,4 @@
-import { useState } from 'react';
+import { useState, useEffect } from 'react';
 import { useAppStore } from '@/store/app-store';
 import { useSetupStore } from '@/store/setup-store';
 
@@ -30,6 +30,9 @@ import { PromptCustomizationSection } from './settings-view/prompts';
 import type { Project as SettingsProject, Theme } from './settings-view/shared/types';
 import type { Project as ElectronProject } from '@/lib/electron';
 
+// Breakpoint constant for mobile (matches Tailwind lg breakpoint)
+const LG_BREAKPOINT = 1024;
+
 export function SettingsView() {
   const {
     theme,
@@ -101,6 +104,33 @@ export function SettingsView() {
   const [showDeleteDialog, setShowDeleteDialog] = useState(false);
   const [showKeyboardMapDialog, setShowKeyboardMapDialog] = useState(false);
 
+  // Mobile navigation state - default to showing on desktop, hidden on mobile
+  const [showNavigation, setShowNavigation] = useState(() => {
+    if (typeof window !== 'undefined') {
+      return window.innerWidth >= LG_BREAKPOINT;
+    }
+    return true; // Default to showing on SSR
+  });
+
+  // Auto-close navigation on mobile when a section is selected
+  useEffect(() => {
+    if (typeof window !== 'undefined' && window.innerWidth < LG_BREAKPOINT) {
+      setShowNavigation(false);
+    }
+  }, [activeView]);
+
+  // Handle window resize to show/hide navigation appropriately
+  useEffect(() => {
+    const handleResize = () => {
+      if (window.innerWidth >= LG_BREAKPOINT) {
+        setShowNavigation(true);
+      }
+    };
+
+    window.addEventListener('resize', handleResize);
+    return () => window.removeEventListener('resize', handleResize);
+  }, []);
+
   // Render the active section based on current view
   const renderActiveSection = () => {
     switch (activeView) {
@@ -187,20 +217,25 @@ export function SettingsView() {
   return (
     <div className="flex-1 flex flex-col overflow-hidden content-bg" data-testid="settings-view">
       {/* Header Section */}
-      <SettingsHeader />
+      <SettingsHeader
+        showNavigation={showNavigation}
+        onToggleNavigation={() => setShowNavigation(!showNavigation)}
+      />
 
       {/* Content Area with Sidebar */}
       <div className="flex-1 flex overflow-hidden">
-        {/* Side Navigation - No longer scrolls, just switches views */}
+        {/* Side Navigation - Overlay on mobile, sidebar on desktop */}
         <SettingsNavigation
           navItems={NAV_ITEMS}
           activeSection={activeView}
           currentProject={currentProject}
           onNavigate={handleNavigate}
+          isOpen={showNavigation}
+          onClose={() => setShowNavigation(false)}
         />
 
         {/* Content Panel - Shows only the active section */}
-        <div className="flex-1 overflow-y-auto p-8">
+        <div className="flex-1 overflow-y-auto p-4 lg:p-8">
           <div className="max-w-4xl mx-auto">{renderActiveSection()}</div>
         </div>
       </div>
diff --git a/apps/ui/src/components/views/settings-view/components/settings-header.tsx b/apps/ui/src/components/views/settings-view/components/settings-header.tsx
index e99159ba..9d1b9ff5 100644
--- a/apps/ui/src/components/views/settings-view/components/settings-header.tsx
+++ b/apps/ui/src/components/views/settings-view/components/settings-header.tsx
@@ -1,14 +1,19 @@
-import { Settings } from 'lucide-react';
+import { Settings, PanelLeft, PanelLeftClose } from 'lucide-react';
 import { cn } from '@/lib/utils';
+import { Button } from '@/components/ui/button';
 
 interface SettingsHeaderProps {
   title?: string;
   description?: string;
+  showNavigation?: boolean;
+  onToggleNavigation?: () => void;
 }
 
 export function SettingsHeader({
   title = 'Settings',
   description = 'Configure your API keys and preferences',
+  showNavigation,
+  onToggleNavigation,
 }: SettingsHeaderProps) {
   return (
     <div
@@ -18,21 +23,39 @@ export function SettingsHeader({
         'bg-gradient-to-r from-card/90 via-card/70 to-card/80 backdrop-blur-xl'
       )}
     >
-      <div className="px-8 py-6">
-        <div className="flex items-center gap-4">
+      <div className="px-4 py-4 lg:px-8 lg:py-6">
+        <div className="flex items-center gap-3 lg:gap-4">
+          {/* Mobile menu toggle button - only visible on mobile */}
+          {onToggleNavigation && (
+            <Button
+              variant="ghost"
+              size="sm"
+              onClick={onToggleNavigation}
+              className="h-8 w-8 p-0 text-muted-foreground hover:text-foreground lg:hidden"
+              aria-label={showNavigation ? 'Close navigation menu' : 'Open navigation menu'}
+            >
+              {showNavigation ? (
+                <PanelLeftClose className="w-5 h-5" />
+              ) : (
+                <PanelLeft className="w-5 h-5" />
+              )}
+            </Button>
+          )}
           <div
             className={cn(
-              'w-12 h-12 rounded-2xl flex items-center justify-center',
+              'w-10 h-10 lg:w-12 lg:h-12 rounded-xl lg:rounded-2xl flex items-center justify-center',
               'bg-gradient-to-br from-brand-500 to-brand-600',
               'shadow-lg shadow-brand-500/25',
               'ring-1 ring-white/10'
             )}
           >
-            <Settings className="w-6 h-6 text-white" />
+            <Settings className="w-5 h-5 lg:w-6 lg:h-6 text-white" />
           </div>
           <div>
-            <h1 className="text-2xl font-bold text-foreground tracking-tight">{title}</h1>
-            <p className="text-sm text-muted-foreground/80 mt-0.5">{description}</p>
+            <h1 className="text-xl lg:text-2xl font-bold text-foreground tracking-tight">
+              {title}
+            </h1>
+            <p className="text-xs lg:text-sm text-muted-foreground/80 mt-0.5">{description}</p>
           </div>
         </div>
       </div>
diff --git a/apps/ui/src/components/views/settings-view/components/settings-navigation.tsx b/apps/ui/src/components/views/settings-view/components/settings-navigation.tsx
index 4af7f5bf..82d31c4d 100644
--- a/apps/ui/src/components/views/settings-view/components/settings-navigation.tsx
+++ b/apps/ui/src/components/views/settings-view/components/settings-navigation.tsx
@@ -1,6 +1,7 @@
 import { useState, useEffect } from 'react';
-import { ChevronDown, ChevronRight } from 'lucide-react';
+import { ChevronDown, ChevronRight, X } from 'lucide-react';
 import { cn } from '@/lib/utils';
+import { Button } from '@/components/ui/button';
 import type { Project } from '@/lib/electron';
 import type { NavigationItem, NavigationGroup } from '../config/navigation';
 import { GLOBAL_NAV_GROUPS, PROJECT_NAV_ITEMS } from '../config/navigation';
@@ -13,6 +14,8 @@ interface SettingsNavigationProps {
   activeSection: SettingsViewId;
   currentProject: Project | null;
   onNavigate: (sectionId: SettingsViewId) => void;
+  isOpen?: boolean;
+  onClose?: () => void;
 }
 
 function NavButton({
@@ -167,75 +170,115 @@ export function SettingsNavigation({
   activeSection,
   currentProject,
   onNavigate,
+  isOpen = true,
+  onClose,
 }: SettingsNavigationProps) {
+  // On mobile, only show when isOpen is true
+  // On desktop (lg+), always show regardless of isOpen
+  const shouldShow = isOpen;
+
+  if (!shouldShow) {
+    return null;
+  }
+
   return (
-    <nav
-      className={cn(
-        'hidden lg:block w-64 shrink-0 overflow-y-auto',
-        'border-r border-border/50',
-        'bg-gradient-to-b from-card/80 via-card/60 to-card/40 backdrop-blur-xl'
-      )}
-    >
-      <div className="sticky top-0 p-4 space-y-1">
-        {/* Global Settings Groups */}
-        {GLOBAL_NAV_GROUPS.map((group, groupIndex) => (
-          <div key={group.label}>
-            {/* Group divider (except for first group) */}
-            {groupIndex > 0 && <div className="my-3 border-t border-border/50" />}
+    <>
+      {/* Mobile backdrop overlay */}
+      <div
+        className="fixed inset-0 bg-black/50 z-20 lg:hidden"
+        onClick={onClose}
+        data-testid="settings-nav-backdrop"
+      />
 
-            {/* Group Label */}
-            <div className="px-3 py-2 text-xs font-semibold text-muted-foreground/70 uppercase tracking-wider">
-              {group.label}
+      {/* Navigation sidebar */}
+      <nav
+        className={cn(
+          // Mobile: fixed position overlay
+          'fixed inset-y-0 left-0 w-72 z-30',
+          // Desktop: relative position in layout
+          'lg:relative lg:w-64 lg:z-auto',
+          'shrink-0 overflow-y-auto',
+          'border-r border-border/50',
+          'bg-gradient-to-b from-card/95 via-card/90 to-card/85 backdrop-blur-xl',
+          // Desktop background
+          'lg:from-card/80 lg:via-card/60 lg:to-card/40'
+        )}
+      >
+        {/* Mobile close button */}
+        <div className="lg:hidden flex items-center justify-between px-4 py-3 border-b border-border/50">
+          <span className="text-sm font-semibold text-foreground">Navigation</span>
+          <Button
+            variant="ghost"
+            size="sm"
+            onClick={onClose}
+            className="h-8 w-8 p-0 text-muted-foreground hover:text-foreground"
+            aria-label="Close navigation menu"
+          >
+            <X className="w-4 h-4" />
+          </Button>
+        </div>
+
+        <div className="sticky top-0 p-4 space-y-1">
+          {/* Global Settings Groups */}
+          {GLOBAL_NAV_GROUPS.map((group, groupIndex) => (
+            <div key={group.label}>
+              {/* Group divider (except for first group) */}
+              {groupIndex > 0 && <div className="my-3 border-t border-border/50" />}
+
+              {/* Group Label */}
+              <div className="px-3 py-2 text-xs font-semibold text-muted-foreground/70 uppercase tracking-wider">
+                {group.label}
+              </div>
+
+              {/* Group Items */}
+              <div className="space-y-1">
+                {group.items.map((item) =>
+                  item.subItems ? (
+                    <NavItemWithSubItems
+                      key={item.id}
+                      item={item}
+                      activeSection={activeSection}
+                      onNavigate={onNavigate}
+                    />
+                  ) : (
+                    <NavButton
+                      key={item.id}
+                      item={item}
+                      isActive={activeSection === item.id}
+                      onNavigate={onNavigate}
+                    />
+                  )
+                )}
+              </div>
             </div>
+          ))}
 
-            {/* Group Items */}
-            <div className="space-y-1">
-              {group.items.map((item) =>
-                item.subItems ? (
-                  <NavItemWithSubItems
-                    key={item.id}
-                    item={item}
-                    activeSection={activeSection}
-                    onNavigate={onNavigate}
-                  />
-                ) : (
+          {/* Project Settings - only show when a project is selected */}
+          {currentProject && (
+            <>
+              {/* Divider */}
+              <div className="my-3 border-t border-border/50" />
+
+              {/* Project Settings Label */}
+              <div className="px-3 py-2 text-xs font-semibold text-muted-foreground/70 uppercase tracking-wider">
+                Project Settings
+              </div>
+
+              {/* Project Settings Items */}
+              <div className="space-y-1">
+                {PROJECT_NAV_ITEMS.map((item) => (
                   <NavButton
                     key={item.id}
                     item={item}
                     isActive={activeSection === item.id}
                     onNavigate={onNavigate}
                   />
-                )
-              )}
-            </div>
-          </div>
-        ))}
-
-        {/* Project Settings - only show when a project is selected */}
-        {currentProject && (
-          <>
-            {/* Divider */}
-            <div className="my-3 border-t border-border/50" />
-
-            {/* Project Settings Label */}
-            <div className="px-3 py-2 text-xs font-semibold text-muted-foreground/70 uppercase tracking-wider">
-              Project Settings
-            </div>
-
-            {/* Project Settings Items */}
-            <div className="space-y-1">
-              {PROJECT_NAV_ITEMS.map((item) => (
-                <NavButton
-                  key={item.id}
-                  item={item}
-                  isActive={activeSection === item.id}
-                  onNavigate={onNavigate}
-                />
-              ))}
-            </div>
-          </>
-        )}
-      </div>
-    </nav>
+                ))}
+              </div>
+            </>
+          )}
+        </div>
+      </nav>
+    </>
   );
 }