diff --git a/README.md b/README.md
index fba0596..c2e8164 100644
--- a/README.md
+++ b/README.md
@@ -37,7 +37,7 @@ The app runs at http://localhost:5173 by default.
 
 ```
 src/
-  components/   reusable UI (Navbar, Footer, QuoteCard, TransferRow, ...)
+  components/   reusable UI (Navbar, Sidebar, Footer, QuoteCard, TransferRow, ...)
   pages/        route screens (Home, SendMoney, Transfers, NotFound)
   services/     mock api, wallet, fx and quote logic
   hooks/        useWallet, useTransfers
@@ -63,6 +63,20 @@ cp .env.example .env
 - `npm run test:watch` — watch mode for local test development
 - `npm run lighthouse` — run Lighthouse CI against the local preview server
 
+## Responsive Layout
+
+The app adapts to three viewport ranges:
+
+| Range | Target | Layout |
+|---|---|---|
+| >1024px | Desktop | Full sidebar (240px), 3-column features grid |
+| 721–1024px | Tablet landscape | Full sidebar with toggle, 2-column features grid, compact content padding |
+| ≤720px | Tablet portrait / mobile | Collapsed sidebar (60px), single-column layouts, wrapped navbar |
+| ≤420px | Small mobile | Stacked hero actions, single-column currency grid |
+
+The Sidebar is rendered alongside the main content area on all viewports wider than
+720px and collapses automatically at narrower widths.
+
 ## Testing
 
 The test suite includes comprehensive coverage of wallet connection handling:
@@ -86,9 +100,9 @@ The test suite includes comprehensive coverage of wallet connection handling:
   - User interaction flows
 
 Integration tests cover send-money validation, successful transfer submission,
-pending button behavior, duplicate-submission prevention, Transfers page filter
-sync (search, status, and date-range presets), and keyboard tab order across
-the main pages.
+pending button behavior, duplicate-submission prevention, Transfers page
+filter sync (search, status, and date-range presets such as last 7/30/90 days),
+and landscape tablet layout integration.
 
 ## Accessibility
 
diff --git a/src/App.jsx b/src/App.jsx
index 8cc9ab4..8b66af6 100644
--- a/src/App.jsx
+++ b/src/App.jsx
@@ -3,6 +3,7 @@ import { AppProvider } from './context/AppContext.jsx'
 import { LocaleProvider } from './context/I18nContext.jsx'
 import ErrorBoundary from './components/ErrorBoundary.jsx'
 import Navbar from './components/Navbar.jsx'
+import Sidebar from './components/Sidebar.jsx'
 import Footer from './components/Footer.jsx'
 import Home from './pages/Home.jsx'
 import SendMoney from './pages/SendMoney.jsx'
@@ -22,6 +23,8 @@ export default function App() {
             <a href="#main-content" className="skip-link">
               Skip to content
             </a>
+            <Sidebar />
+            <div className="app-content">
             <Navbar />
             <main id="main-content" className="app-main">
               <ErrorBoundary>
@@ -34,6 +37,7 @@ export default function App() {
               </ErrorBoundary>
             </main>
             <Footer />
+            </div>
           </div>
         </BrowserRouter>
       </AppProvider>
diff --git a/src/responsive.css b/src/responsive.css
index f83cd4c..e95e41a 100644
--- a/src/responsive.css
+++ b/src/responsive.css
@@ -1,5 +1,15 @@
 /* Responsive tweaks for narrow viewports. */
 
+@media (min-width: 721px) and (max-width: 1024px) {
+  .features {
+    grid-template-columns: repeat(2, 1fr);
+  }
+
+  .app-main {
+    padding: 1.5rem 1.25rem;
+  }
+}
+
 @media (max-width: 720px) {
   .navbar {
     flex-wrap: wrap;
diff --git a/test/integration/landscape-layout.test.jsx b/test/integration/landscape-layout.test.jsx
new file mode 100644
index 0000000..05771e8
--- /dev/null
+++ b/test/integration/landscape-layout.test.jsx
@@ -0,0 +1,88 @@
+import fs from 'node:fs'
+import path from 'node:path'
+import { render, screen } from '@testing-library/react'
+import { beforeEach, describe, expect, it } from 'vitest'
+import App from '../../src/App.jsx'
+
+function readCSS(filename) {
+  return fs.readFileSync(
+    path.resolve(process.cwd(), 'src', filename),
+    'utf8',
+  )
+}
+
+describe('landscape layout for tablets', () => {
+  describe('responsive.css', () => {
+    const css = readCSS('responsive.css')
+
+    it('contains a tablet landscape breakpoint (721px–1024px)', () => {
+      expect(css).toMatch(
+        /@media\s*\(\s*min-width\s*:\s*721px\s*\)\s*and\s*\(\s*max-width\s*:\s*1024px\s*\)/,
+      )
+    })
+
+    it('adjusts .features to 2 columns within the landscape breakpoint', () => {
+      const start = css.indexOf('@media (min-width: 721px)')
+      const block = css.slice(start, css.indexOf('@media (max-width: 720px)'))
+      expect(block).toContain('grid-template-columns')
+      expect(block).toContain('repeat(2, 1fr)')
+    })
+
+    it('adjusts .app-main padding within the landscape breakpoint', () => {
+      const start = css.indexOf('@media (min-width: 721px)')
+      const block = css.slice(start, css.indexOf('@media (max-width: 720px)'))
+      expect(block).toContain('.app-main')
+      expect(block).toContain('padding')
+    })
+  })
+
+  describe('sidebar integration in App', () => {
+    beforeEach(() => {
+      localStorage.clear()
+    })
+
+    it('renders the Sidebar as part of the app layout', () => {
+      render(<App />)
+      const sidebar = document.querySelector('.sidebar')
+      expect(sidebar).toBeInTheDocument()
+    })
+
+    it('renders sidebar navigation links within the app', () => {
+      render(<App />)
+      const homeLinks = screen.getAllByText('Home')
+      expect(homeLinks.length).toBeGreaterThanOrEqual(1)
+      const sidebarLinks = document.querySelectorAll('.sidebar-link')
+      expect(sidebarLinks.length).toBe(3)
+    })
+
+    it('renders the sidebar toggle button', () => {
+      render(<App />)
+      const toggle = screen.getByLabelText('Collapse sidebar')
+      expect(toggle).toBeInTheDocument()
+    })
+
+    it('renders the content area alongside the sidebar', () => {
+      render(<App />)
+      const app = document.querySelector('.app')
+      const sidebar = document.querySelector('.sidebar')
+      const content = document.querySelector('.app-content')
+
+      expect(app).toBeInTheDocument()
+      expect(sidebar).toBeInTheDocument()
+      expect(content).toBeInTheDocument()
+
+      expect(app.contains(sidebar)).toBe(true)
+      expect(app.contains(content)).toBe(true)
+    })
+
+    it('renders Navbar and Footer inside .app-content', () => {
+      render(<App />)
+      const content = document.querySelector('.app-content')
+      const navbar = document.querySelector('.navbar')
+      const footer = document.querySelector('.footer')
+
+      expect(content.contains(navbar)).toBe(true)
+      expect(content.contains(footer)).toBe(true)
+    })
+  })
+})