Add compact mobile header with hamburger menu and slide-in drawer (#218)

src/components/Navbar.css

@@ -51,8 +51,138 @@
   margin-left: auto;
 }
 
+/* ── Hamburger button ─────────────────────────── */
+
+.navbar-hamburger {
+  display: none;
+  flex-direction: column;
+  justify-content: center;
+  gap: 5px;
+  margin-left: auto;
+  background: none;
+  border: none;
+  cursor: pointer;
+  min-width: 44px;
+  min-height: 44px;
+  padding: 8px;
+  border-radius: 6px;
+  color: var(--color-text);
+}
+
+.navbar-hamburger:hover {
+  background: rgba(255, 255, 255, 0.06);
+}
+
+.navbar-hamburger-line {
+  display: block;
+  width: 22px;
+  height: 2px;
+  background: currentColor;
+  border-radius: 2px;
+  transition: transform 0.2s ease;
+}
+
+/* ── Mobile backdrop ─────────────────────────── */
+
+.navbar-backdrop {
+  position: fixed;
+  inset: 0;
+  z-index: 90;
+  background: rgba(0, 0, 0, 0.5);
+}
+
+/* ── Mobile drawer ─────────────────────────── */
+
+.navbar-drawer {
+  position: fixed;
+  top: 0;
+  right: 0;
+  z-index: 100;
+  width: 280px;
+  height: 100vh;
+  background: var(--color-surface);
+  border-left: 1px solid #1f2a3a;
+  display: flex;
+  flex-direction: column;
+  transform: translateX(100%);
+  transition: transform 0.25s ease;
+}
+
+.navbar-drawer--open {
+  transform: translateX(0);
+}
+
+.navbar-drawer-nav {
+  display: flex;
+  flex-direction: column;
+  gap: 0.25rem;
+  padding: 1rem 0.75rem;
+  flex: 1;
+}
+
+.navbar-drawer-link {
+  display: flex;
+  align-items: center;
+  gap: 0.75rem;
+  padding: 0.625rem 0.75rem;
+  border-radius: 8px;
+  color: var(--color-muted);
+  font-weight: 500;
+  font-size: 0.925rem;
+  text-decoration: none;
+  min-height: 44px;
+  transition: background 0.15s ease, color 0.15s ease;
+}
+
+.navbar-drawer-link:hover {
+  background: rgba(255, 255, 255, 0.06);
+  color: var(--color-text);
+}
+
+.navbar-drawer-link.active {
+  background: rgba(99, 102, 241, 0.15);
+  color: var(--color-primary);
+}
+
+.navbar-drawer-link-icon {
+  display: flex;
+  align-items: center;
+  justify-content: center;
+  flex-shrink: 0;
+  width: 24px;
+  height: 24px;
+}
+
+.navbar-drawer-actions {
+  display: flex;
+  flex-direction: column;
+  gap: 0.75rem;
+  padding: 1rem 0.75rem;
+  border-top: 1px solid #1f2a3a;
+}
+
+/* ── Mobile responsive ─────────────────────────── */
+
+@media (max-width: 720px) {
+  .navbar-links {
+    display: none;
+  }
+
+  .navbar-actions {
+    display: none;
+  }
+
+  .navbar-hamburger {
+    display: flex;
+  }
+}
+
 @media (prefers-contrast: more) {
   .navbar {
     border-bottom-width: 2px;
   }
-}
+
+  .navbar-drawer {
+    border-left-width: 2px;
+  }
+}

src/components/Navbar.jsx

@@ -1,15 +1,31 @@
+import { useState, useEffect, useCallback } from 'react'
 import { NavLink, Link } from 'react-router-dom'
 import WalletButton from './WalletButton.jsx'
 import LocaleSelect from './LocaleSelect.jsx'
 import { useApp } from '../context/AppContext.jsx'
 import './Navbar.css'
 
-/**
- * Top navigation bar with links, the locale preference and the wallet
- * connect button.
- */
 export default function Navbar() {
   const { locale, setLocale } = useApp()
+  const [menuOpen, setMenuOpen] = useState(false)
+
+  const closeMenu = useCallback(() => setMenuOpen(false), [])
+
+  useEffect(() => {
+    if (!menuOpen) return
+    const handler = (e) => { if (e.key === 'Escape') closeMenu() }
+    document.addEventListener('keydown', handler)
+    return () => document.removeEventListener('keydown', handler)
+  }, [menuOpen, closeMenu])
+
+  useEffect(() => {
+    if (menuOpen) {
+      document.body.style.overflow = 'hidden'
+    } else {
+      document.body.style.overflow = ''
+    }
+    return () => { document.body.style.overflow = '' }
+  }, [menuOpen])
 
   return (
     <header className="navbar">
@@ -39,6 +55,66 @@ export default function Navbar() {
         />
         <WalletButton />
       </div>
+
+      <button
+        type="button"
+        className="navbar-hamburger"
+        onClick={() => setMenuOpen((prev) => !prev)}
+        aria-label={menuOpen ? 'Close menu' : 'Open menu'}
+        aria-expanded={menuOpen}
+      >
+        <span className="navbar-hamburger-line" />
+        <span className="navbar-hamburger-line" />
+        <span className="navbar-hamburger-line" />
+      </button>
+
+      {menuOpen && (
+        <div className="navbar-backdrop" onClick={closeMenu} />
+      )}
+
+      <aside
+        className={`navbar-drawer${menuOpen ? ' navbar-drawer--open' : ''}`}
+        aria-label="Mobile navigation"
+      >
+        <nav className="navbar-drawer-nav">
+          <NavLink to="/" end className="navbar-drawer-link" onClick={closeMenu}>
+            <span className="navbar-drawer-link-icon" aria-hidden="true">
+              <svg width="20" height="20" viewBox="0 0 20 20" fill="none">
+                <path d="M3 7L10 2L17 7V17H12V11H8V17H3V7Z" stroke="currentColor" strokeWidth="1.5" strokeLinejoin="round"/>
+              </svg>
+            </span>
+            Home
+          </NavLink>
+          <NavLink to="/send" className="navbar-drawer-link" onClick={closeMenu}>
+            <span className="navbar-drawer-link-icon" aria-hidden="true">
+              <svg width="20" height="20" viewBox="0 0 20 20" fill="none">
+                <path d="M4 16L16 4M16 4H7M16 4V13" stroke="currentColor" strokeWidth="1.5" strokeLinecap="round" strokeLinejoin="round"/>
+              </svg>
+            </span>
+            Send Money
+          </NavLink>
+          <NavLink to="/transfers" className="navbar-drawer-link" onClick={closeMenu}>
+            <span className="navbar-drawer-link-icon" aria-hidden="true">
+              <svg width="20" height="20" viewBox="0 0 20 20" fill="none">
+                <rect x="2" y="4" width="16" height="13" rx="2" stroke="currentColor" strokeWidth="1.5"/>
+                <path d="M2 8H18" stroke="currentColor" strokeWidth="1.5"/>
+                <path d="M6 12H11" stroke="currentColor" strokeWidth="1.5" strokeLinecap="round"/>
+              </svg>
+            </span>
+            Transfers
+          </NavLink>
+        </nav>
+
+        <div className="navbar-drawer-actions">
+          <LocaleSelect
+            value={locale}
+            onChange={setLocale}
+            id="drawer-locale"
+            ariaLabel="Language & region"
+          />
+          <WalletButton />
+        </div>
+      </aside>
     </header>
   )
-}
+}

src/components/Navbar.stories.jsx

@@ -16,4 +16,4 @@ export default {
 
 export const Default = {
   render: () => <Navbar />
-}
+}

src/responsive.css

@@ -1,11 +1,6 @@
 /* Responsive tweaks for narrow viewports. */
 
 @media (max-width: 720px) {
-  .navbar {
-    flex-wrap: wrap;
-    gap: 0.75rem;
-  }
-
   .features {
     grid-template-columns: 1fr;
   }

test/components/Navbar.test.jsx

@@ -0,0 +1,98 @@
+import { render, screen, fireEvent } from '@testing-library/react'
+import { MemoryRouter } from 'react-router-dom'
+import { describe, expect, it } from 'vitest'
+import Navbar from '../../src/components/Navbar.jsx'
+import { AppProvider } from '../../src/context/AppContext.jsx'
+
+function renderNavbar(initialRoute = '/') {
+  return render(
+    <AppProvider>
+      <MemoryRouter initialEntries={[initialRoute]}>
+        <Navbar />
+      </MemoryRouter>
+    </AppProvider>
+  )
+}
+
+describe('Navbar', () => {
+  it('renders the brand name', () => {
+    renderNavbar()
+    expect(screen.getByText('RemitFlow')).toBeInTheDocument()
+  })
+
+  it('renders navigation links', () => {
+    renderNavbar()
+    const links = screen.getAllByText('Home')
+    expect(links.length).toBe(2)
+    expect(screen.getAllByText('Send Money').length).toBe(2)
+    expect(screen.getAllByText('Transfers').length).toBe(2)
+  })
+
+  it('highlights the active link based on current route', () => {
+    renderNavbar('/send')
+    const sendLinks = screen.getAllByText('Send Money')
+    const activeLinks = sendLinks.filter((l) => l.className.includes('active'))
+    expect(activeLinks.length).toBe(2)
+  })
+
+  it('has a hamburger button with aria-label', () => {
+    renderNavbar()
+    const hamburger = screen.getByLabelText('Open menu')
+    expect(hamburger).toBeInTheDocument()
+    expect(hamburger).toHaveAttribute('aria-expanded', 'false')
+  })
+
+  it('opens the mobile drawer when hamburger is clicked', () => {
+    renderNavbar()
+    const hamburger = screen.getByLabelText('Open menu')
+    fireEvent.click(hamburger)
+    expect(screen.getByLabelText('Close menu')).toBeInTheDocument()
+    expect(hamburger.getAttribute('aria-expanded')).toBe('true')
+    const drawer = document.querySelector('.navbar-drawer')
+    expect(drawer).toHaveClass('navbar-drawer--open')
+  })
+
+  it('closes the mobile drawer when a nav link is clicked', () => {
+    renderNavbar()
+    const hamburger = screen.getByLabelText('Open menu')
+    fireEvent.click(hamburger)
+
+    const homeLink = screen.getAllByText('Home')[1]
+    fireEvent.click(homeLink)
+
+    expect(screen.getByLabelText('Open menu')).toBeInTheDocument()
+    const drawer = document.querySelector('.navbar-drawer')
+    expect(drawer).not.toHaveClass('navbar-drawer--open')
+  })
+
+  it('closes the mobile drawer on Escape key', () => {
+    renderNavbar()
+    const hamburger = screen.getByLabelText('Open menu')
+    fireEvent.click(hamburger)
+
+    fireEvent.keyDown(document, { key: 'Escape' })
+
+    expect(screen.getByLabelText('Open menu')).toBeInTheDocument()
+  })
+
+  it('closes the mobile drawer when backdrop is clicked', () => {
+    renderNavbar()
+    const hamburger = screen.getByLabelText('Open menu')
+    fireEvent.click(hamburger)
+
+    const backdrop = document.querySelector('.navbar-backdrop')
+    fireEvent.click(backdrop)
+
+    expect(screen.getByLabelText('Open menu')).toBeInTheDocument()
+  })
+
+  it('renders the LocaleSelect and WalletButton in the drawer on mobile', () => {
+    renderNavbar()
+    const hamburger = screen.getByLabelText('Open menu')
+    fireEvent.click(hamburger)
+
+    const localeSelects = screen.getAllByLabelText('Language & region')
+    expect(localeSelects.length).toBe(2)
+    expect(screen.getAllByText('Connect Wallet').length).toBe(2)
+  })
+})

test/touch-targets.test.js

@@ -87,6 +87,15 @@ describe('touch target minimum sizes (44px)', () => {
     it('.navbar-link has min-height 44px', () => {
       expect(css).toMatch(/\.navbar-link\s*\{[^}]*min-height:\s*44px/);
     });
+
+    it('.navbar-hamburger has min-height and min-width 44px', () => {
+      expect(css).toMatch(/\.navbar-hamburger\s*\{[^}]*min-width:\s*44px/);
+      expect(css).toMatch(/\.navbar-hamburger\s*\{[^}]*min-height:\s*44px/);
+    });
+
+    it('.navbar-drawer-link has min-height 44px', () => {
+      expect(css).toMatch(/\.navbar-drawer-link\s*\{[^}]*min-height:\s*44px/);
+    });
   });
 
   describe('Footer', () => {