diff --git a/apps/web/src/features/dashboard/application-shell.test.tsx b/apps/web/src/features/dashboard/application-shell.test.tsx
new file mode 100644
index 0000000..38acf46
--- /dev/null
+++ b/apps/web/src/features/dashboard/application-shell.test.tsx
@@ -0,0 +1,37 @@
+// Verifies the application shell exposes accessible responsive navigation and active state.
+import { RouterProvider } from '@tanstack/react-router';
+import { cleanup, render, screen, within } from '@testing-library/react';
+import { afterEach, describe, expect, it } from 'vitest';
+
+import { router } from '../../router';
+
+afterEach(cleanup);
+
+describe('application shell', () => {
+  it('renders desktop and mobile navigation with the current page selected', async () => {
+    await router.navigate({ to: '/dashboard' });
+    render(<RouterProvider router={router} />);
+
+    expect(screen.getByRole('heading', { name: 'Dashboard' })).toBeVisible();
+
+    const navigationRegions = screen.getAllByRole('navigation', {
+      name: /primary navigation/i,
+    });
+    expect(navigationRegions).toHaveLength(2);
+
+    for (const navigation of navigationRegions) {
+      expect(
+        within(navigation).getByRole('link', { name: 'Dashboard' }),
+      ).toHaveAttribute('aria-current', 'page');
+      expect(
+        within(navigation).getByRole('link', { name: 'Routines' }),
+      ).toHaveAttribute('href', '/routines');
+      expect(
+        within(navigation).getByRole('link', { name: 'History' }),
+      ).toHaveAttribute('href', '/history');
+      expect(
+        within(navigation).getByRole('link', { name: 'Settings' }),
+      ).toHaveAttribute('href', '/settings');
+    }
+  });
+});
diff --git a/apps/web/src/features/dashboard/application-shell.tsx b/apps/web/src/features/dashboard/application-shell.tsx
new file mode 100644
index 0000000..bcb5d02
--- /dev/null
+++ b/apps/web/src/features/dashboard/application-shell.tsx
@@ -0,0 +1,133 @@
+// Provides the responsive desktop and mobile navigation frame for application pages.
+import {
+  Dumbbell,
+  History,
+  LayoutDashboard,
+  Settings,
+  type LucideIcon,
+} from 'lucide-react';
+import { Link } from '@tanstack/react-router';
+import type { ReactNode } from 'react';
+
+import wordmarkUrl from '../../assets/goforlift-wordmark.png';
+import { cn } from '../../lib/utils';
+
+const navigationItems = [
+  { href: '/dashboard', icon: LayoutDashboard, label: 'Dashboard' },
+  { href: '/routines', icon: Dumbbell, label: 'Routines' },
+  { href: '/history', icon: History, label: 'History' },
+  { href: '/settings', icon: Settings, label: 'Settings' },
+] as const;
+
+type ApplicationShellProps = {
+  children: ReactNode;
+};
+
+export function ApplicationShell({ children }: ApplicationShellProps) {
+  return (
+    <div
+      className={cn(
+        'min-h-screen bg-background text-foreground',
+        'lg:grid lg:grid-cols-[256px_minmax(0,1fr)]',
+      )}
+    >
+      <aside className="hidden border-r bg-surface lg:flex lg:min-h-screen lg:flex-col">
+        <Brand className="px-7 py-8" />
+        <Navigation className="flex-1 space-y-1 px-4" />
+      </aside>
+
+      <div className="min-w-0">
+        <header
+          className={cn(
+            'sticky top-0 z-20 flex h-16 items-center px-5',
+            'border-b bg-surface/95 backdrop-blur',
+            'lg:hidden',
+          )}
+        >
+          <Brand />
+        </header>
+        <main
+          className={cn(
+            'mx-auto w-full max-w-[1440px] px-5 py-7 pb-28',
+            'sm:px-8',
+            'lg:px-10 lg:py-9 lg:pb-10',
+          )}
+        >
+          {children}
+        </main>
+      </div>
+
+      <Navigation
+        className={cn(
+          'fixed inset-x-0 bottom-0 z-30 grid grid-cols-4 px-2 pt-2',
+          'border-t bg-surface/95 backdrop-blur',
+          'pb-[max(0.5rem,env(safe-area-inset-bottom))]',
+          'lg:hidden',
+        )}
+      />
+    </div>
+  );
+}
+
+function Brand({ className }: { className?: string }) {
+  return (
+    <Link
+      aria-label="GoForLift dashboard"
+      className={cn('block', className)}
+      to="/dashboard"
+    >
+      <img alt="GoForLift" className="h-auto w-[132px]" src={wordmarkUrl} />
+    </Link>
+  );
+}
+
+type NavigationProps = {
+  className?: string;
+};
+
+function Navigation({ className }: NavigationProps) {
+  return (
+    <nav aria-label="Primary navigation" className={className}>
+      {navigationItems.map((item) => (
+        <NavigationItem
+          href={item.href}
+          icon={item.icon}
+          key={item.href}
+          label={item.label}
+        />
+      ))}
+    </nav>
+  );
+}
+
+type NavigationItemProps = {
+  href: (typeof navigationItems)[number]['href'];
+  icon: LucideIcon;
+  label: string;
+};
+
+function NavigationItem({ href, icon: Icon, label }: NavigationItemProps) {
+  return (
+    <Link
+      activeOptions={{ exact: true }}
+      activeProps={{
+        className:
+          'bg-primary/15 text-primary hover:bg-primary/20 hover:text-primary',
+      }}
+      className={cn(
+        'flex min-h-14 flex-col items-center justify-center gap-1 rounded-md px-1 text-[11px]',
+        'transition-colors',
+        'focus-visible:outline-none focus-visible:ring-2 focus-visible:ring-ring',
+        'lg:min-h-11 lg:flex-row lg:justify-start lg:gap-3 lg:px-4 lg:text-sm lg:font-medium',
+      )}
+      inactiveProps={{
+        className:
+          'text-muted-foreground hover:bg-accent hover:text-foreground',
+      }}
+      to={href}
+    >
+      <Icon aria-hidden="true" className="size-5 lg:size-[18px]" />
+      <span>{label}</span>
+    </Link>
+  );
+}
diff --git a/apps/web/src/features/dashboard/dashboard-landing.tsx b/apps/web/src/features/dashboard/dashboard-landing.tsx
index b9e3655..f946dcf 100644
--- a/apps/web/src/features/dashboard/dashboard-landing.tsx
+++ b/apps/web/src/features/dashboard/dashboard-landing.tsx
@@ -1,16 +1,6 @@
-// Presents the temporary shared landing state before the full dashboard is designed.
+// Presents the dashboard heading inside the shared responsive application shell.
+import { SectionLanding } from './section-landing';
+
 export function DashboardLanding() {
-  return (
-    <main className="flex min-h-screen items-center justify-center bg-background px-6 text-foreground">
-      <section className="max-w-md text-center">
-        <p className="text-sm font-medium uppercase tracking-[0.2em] text-primary">
-          Dashboard
-        </p>
-        <h1 className="mt-3 text-3xl font-semibold">Welcome to GoForLift</h1>
-        <p className="mt-4 text-muted-foreground">
-          Your session is ready. The full dashboard is the next step.
-        </p>
-      </section>
-    </main>
-  );
+  return <SectionLanding title="Dashboard" />;
 }
diff --git a/apps/web/src/features/dashboard/section-landing.tsx b/apps/web/src/features/dashboard/section-landing.tsx
new file mode 100644
index 0000000..981c41a
--- /dev/null
+++ b/apps/web/src/features/dashboard/section-landing.tsx
@@ -0,0 +1,16 @@
+// Presents a minimal content heading inside the shared application shell.
+import { ApplicationShell } from './application-shell';
+
+type SectionLandingProps = {
+  title: string;
+};
+
+export function SectionLanding({ title }: SectionLandingProps) {
+  return (
+    <ApplicationShell>
+      <h1 className="text-3xl font-semibold tracking-tight sm:text-4xl">
+        {title}
+      </h1>
+    </ApplicationShell>
+  );
+}
diff --git a/apps/web/src/lib/utils.ts b/apps/web/src/lib/utils.ts
index 2819a83..0c6aef0 100644
--- a/apps/web/src/lib/utils.ts
+++ b/apps/web/src/lib/utils.ts
@@ -1,6 +1,9 @@
+// Combines conditional class names and resolves conflicting Tailwind utilities for reusable components.
 import { clsx, type ClassValue } from 'clsx';
 import { twMerge } from 'tailwind-merge';
 
+// `cn` means "class names"; this helper keeps conditional styles readable and
+// ensures later Tailwind utilities correctly override conflicting earlier ones.
 export function cn(...inputs: ClassValue[]) {
   return twMerge(clsx(inputs));
 }
diff --git a/apps/web/src/routeTree.gen.ts b/apps/web/src/routeTree.gen.ts
index 0cda756..7831fcd 100644
--- a/apps/web/src/routeTree.gen.ts
+++ b/apps/web/src/routeTree.gen.ts
@@ -11,6 +11,9 @@
 import { Route as rootRouteImport } from './routes/__root'
 import { Route as IndexRouteImport } from './routes/index'
 import { Route as DashboardRouteImport } from './routes/dashboard'
+import { Route as HistoryRouteImport } from './routes/history'
+import { Route as RoutinesRouteImport } from './routes/routines'
+import { Route as SettingsRouteImport } from './routes/settings'
 
 const IndexRoute = IndexRouteImport.update({
   id: '/',
@@ -22,31 +25,58 @@ const DashboardRoute = DashboardRouteImport.update({
   path: '/dashboard',
   getParentRoute: () => rootRouteImport,
 } as any)
+const HistoryRoute = HistoryRouteImport.update({
+  id: '/history',
+  path: '/history',
+  getParentRoute: () => rootRouteImport,
+} as any)
+const RoutinesRoute = RoutinesRouteImport.update({
+  id: '/routines',
+  path: '/routines',
+  getParentRoute: () => rootRouteImport,
+} as any)
+const SettingsRoute = SettingsRouteImport.update({
+  id: '/settings',
+  path: '/settings',
+  getParentRoute: () => rootRouteImport,
+} as any)
 
 export interface FileRoutesByFullPath {
   '/': typeof IndexRoute
   '/dashboard': typeof DashboardRoute
+  '/history': typeof HistoryRoute
+  '/routines': typeof RoutinesRoute
+  '/settings': typeof SettingsRoute
 }
 export interface FileRoutesByTo {
   '/': typeof IndexRoute
   '/dashboard': typeof DashboardRoute
+  '/history': typeof HistoryRoute
+  '/routines': typeof RoutinesRoute
+  '/settings': typeof SettingsRoute
 }
 export interface FileRoutesById {
   __root__: typeof rootRouteImport
   '/': typeof IndexRoute
   '/dashboard': typeof DashboardRoute
+  '/history': typeof HistoryRoute
+  '/routines': typeof RoutinesRoute
+  '/settings': typeof SettingsRoute
 }
 export interface FileRouteTypes {
   fileRoutesByFullPath: FileRoutesByFullPath
-  fullPaths: '/' | '/dashboard'
+  fullPaths: '/' | '/dashboard' | '/history' | '/routines' | '/settings'
   fileRoutesByTo: FileRoutesByTo
-  to: '/' | '/dashboard'
-  id: '__root__' | '/' | '/dashboard'
+  to: '/' | '/dashboard' | '/history' | '/routines' | '/settings'
+  id: '__root__' | '/' | '/dashboard' | '/history' | '/routines' | '/settings'
   fileRoutesById: FileRoutesById
 }
 export interface RootRouteChildren {
   IndexRoute: typeof IndexRoute
   DashboardRoute: typeof DashboardRoute
+  HistoryRoute: typeof HistoryRoute
+  RoutinesRoute: typeof RoutinesRoute
+  SettingsRoute: typeof SettingsRoute
 }
 
 declare module '@tanstack/react-router' {
@@ -65,12 +95,36 @@ declare module '@tanstack/react-router' {
       preLoaderRoute: typeof DashboardRouteImport
       parentRoute: typeof rootRouteImport
     }
+    '/history': {
+      id: '/history'
+      path: '/history'
+      fullPath: '/history'
+      preLoaderRoute: typeof HistoryRouteImport
+      parentRoute: typeof rootRouteImport
+    }
+    '/routines': {
+      id: '/routines'
+      path: '/routines'
+      fullPath: '/routines'
+      preLoaderRoute: typeof RoutinesRouteImport
+      parentRoute: typeof rootRouteImport
+    }
+    '/settings': {
+      id: '/settings'
+      path: '/settings'
+      fullPath: '/settings'
+      preLoaderRoute: typeof SettingsRouteImport
+      parentRoute: typeof rootRouteImport
+    }
   }
 }
 
 const rootRouteChildren: RootRouteChildren = {
   IndexRoute: IndexRoute,
   DashboardRoute: DashboardRoute,
+  HistoryRoute: HistoryRoute,
+  RoutinesRoute: RoutinesRoute,
+  SettingsRoute: SettingsRoute,
 }
 export const routeTree = rootRouteImport
   ._addFileChildren(rootRouteChildren)
diff --git a/apps/web/src/routes/history.tsx b/apps/web/src/routes/history.tsx
new file mode 100644
index 0000000..8ad2e9a
--- /dev/null
+++ b/apps/web/src/routes/history.tsx
@@ -0,0 +1,8 @@
+// Maps the history destination into the shared responsive application shell.
+import { createFileRoute } from '@tanstack/react-router';
+
+import { SectionLanding } from '../features/dashboard/section-landing';
+
+export const Route = createFileRoute('/history')({
+  component: () => <SectionLanding title="History" />,
+});
diff --git a/apps/web/src/routes/index.test.tsx b/apps/web/src/routes/index.test.tsx
index 0663e63..8f325c3 100644
--- a/apps/web/src/routes/index.test.tsx
+++ b/apps/web/src/routes/index.test.tsx
@@ -42,7 +42,9 @@ describe('welcome page', () => {
 
     fireEvent.click(screen.getByRole('button', { name: /continue as guest/i }));
 
-    expect(await screen.findByText(/your session is ready/i)).toBeVisible();
+    expect(
+      await screen.findByRole('heading', { name: 'Dashboard' }),
+    ).toBeVisible();
     expect(sessionStorage.getItem('goforlift.guest')).toBe('true');
     expect(router.state.location.pathname).toBe('/dashboard');
 
diff --git a/apps/web/src/routes/routines.tsx b/apps/web/src/routes/routines.tsx
new file mode 100644
index 0000000..748764b
--- /dev/null
+++ b/apps/web/src/routes/routines.tsx
@@ -0,0 +1,8 @@
+// Maps the routines destination into the shared responsive application shell.
+import { createFileRoute } from '@tanstack/react-router';
+
+import { SectionLanding } from '../features/dashboard/section-landing';
+
+export const Route = createFileRoute('/routines')({
+  component: () => <SectionLanding title="Routines" />,
+});
diff --git a/apps/web/src/routes/settings.tsx b/apps/web/src/routes/settings.tsx
new file mode 100644
index 0000000..d63288d
--- /dev/null
+++ b/apps/web/src/routes/settings.tsx
@@ -0,0 +1,8 @@
+// Maps the settings destination into the shared responsive application shell.
+import { createFileRoute } from '@tanstack/react-router';
+
+import { SectionLanding } from '../features/dashboard/section-landing';
+
+export const Route = createFileRoute('/settings')({
+  component: () => <SectionLanding title="Settings" />,
+});
diff --git a/apps/web/src/styles.css b/apps/web/src/styles.css
index 0a33600..8bbb3dd 100644
--- a/apps/web/src/styles.css
+++ b/apps/web/src/styles.css
@@ -6,19 +6,19 @@
 
 :root {
   color-scheme: dark;
-  --background: oklch(0.145 0.01 285);
+  --background: oklch(0.14 0.018 255);
   --foreground: oklch(0.96 0.01 285);
-  --surface: oklch(0.205 0.015 285);
-  --surface-elevated: oklch(0.26 0.02 285);
-  --primary: oklch(0.72 0.16 175);
-  --primary-foreground: oklch(0.15 0.02 175);
-  --secondary: oklch(0.26 0.02 285);
+  --surface: oklch(0.18 0.022 255);
+  --surface-elevated: oklch(0.22 0.025 255);
+  --primary: oklch(0.59 0.22 27);
+  --primary-foreground: oklch(0.98 0.005 27);
+  --secondary: oklch(0.22 0.025 255);
   --secondary-foreground: oklch(0.96 0.01 285);
-  --accent: oklch(0.3 0.025 285);
+  --accent: oklch(0.24 0.025 255);
   --accent-foreground: oklch(0.96 0.01 285);
-  --muted-foreground: oklch(0.7 0.02 285);
-  --border: oklch(0.32 0.02 285);
-  --input: oklch(0.32 0.02 285);
+  --muted-foreground: oklch(0.7 0.018 255);
+  --border: oklch(0.3 0.025 255);
+  --input: oklch(0.3 0.025 255);
   --ring: var(--primary);
   --destructive: oklch(0.65 0.2 25);
 }
diff --git a/docs/design.md b/docs/design.md
index 6543acc..6528e82 100644
--- a/docs/design.md
+++ b/docs/design.md
@@ -310,6 +310,19 @@ If the same meaningful visual pattern repeatedly appears, consider:
 
 Do not abstract one-off styling simply to eliminate every repeated class.
 
+For readability, keep short Tailwind class lists inline. When a list becomes
+long or combines several responsibilities, pass multiple strings to `cn()` and
+group them in this order when applicable:
+
+1. layout and spacing
+2. typography and color
+3. interaction and focus states
+4. responsive overrides
+5. conditional state
+
+Extract a reusable component or `cva()` variant only when a meaningful styling
+pattern actually repeats.
+
 
 # 14. Responsive Design
 
@@ -800,4 +813,4 @@ not:
              +
     workout functionality added afterward
 
-Usability comes first.
\ No newline at end of file
+Usability comes first.