diff --git a/web/frontend/app/features/auth/components/AuthSplitLayout.stories.tsx b/web/frontend/app/features/auth/components/AuthSplitLayout.stories.tsx
new file mode 100644
index 00000000..8e54f8c2
--- /dev/null
+++ b/web/frontend/app/features/auth/components/AuthSplitLayout.stories.tsx
@@ -0,0 +1,151 @@
+import { zodResolver } from '@hookform/resolvers/zod';
+import type { Meta, StoryObj } from '@storybook/react-vite';
+import { useForm } from 'react-hook-form';
+import { expect, fireEvent, userEvent, within } from 'storybook/test';
+import AuthCardHeading from './AuthCardHeading';
+import AuthErrorAlert from './AuthErrorAlert';
+import AuthSplitLayout from './AuthSplitLayout';
+import AuthSwitchPrompt from './AuthSwitchPrompt';
+import LoginForm from './LoginForm';
+import RegisterForm from './RegisterForm';
+import RegisterStepProgress from './RegisterStepProgress';
+import { useRegisterWizard } from '../hooks/useRegisterWizard';
+import { loginSchema, type LoginSchema } from '../schemas';
+
+const noop = () => undefined;
+
+const authSplitLayoutDescription = `The shared split-screen shell behind /login and /register: a full-bleed bar photo carrying the hero headline, and a solid card holding the page's own heading, form, and switch prompt. The grid splits 6fr/5fr from 820px up and stacks hero over card below it. Both stories compose the real forms, so they show the production layout at any viewport.`;
+
+const LoginPanel = ({ error }: { error?: string }) => {
+    const form = useForm<LoginSchema>({ resolver: zodResolver(loginSchema) });
+
+    return (
+        <>
+            <AuthCardHeading title="Sign in" subtitle="Sign in to your Biergarten account" />
+
+            {error ? <AuthErrorAlert message={error} /> : null}
+
+            <LoginForm
+                onSubmit={form.handleSubmit(noop)}
+                formState={form.formState}
+                register={form.register}
+                submitting={false}
+            />
+
+            <AuthSwitchPrompt lead="New to Biergarten?" to="/register" label="Create an account" />
+        </>
+    );
+};
+
+const RegisterPanel = () => {
+    const wizard = useRegisterWizard(noop);
+
+    return (
+        <>
+            <RegisterStepProgress
+                step={wizard.step}
+                totalSteps={wizard.totalSteps}
+                name={wizard.name}
+            />
+
+            <AuthCardHeading title={wizard.title} subtitle={wizard.subtitle} />
+
+            <RegisterForm wizard={wizard} submitting={false} />
+
+            <AuthSwitchPrompt lead="Already have an account?" to="/login" label="Sign in" />
+        </>
+    );
+};
+
+const meta = {
+    title: 'Layout/AuthSplitLayout',
+    component: AuthSplitLayout,
+    tags: ['autodocs'],
+    parameters: {
+        layout: 'fullscreen',
+        docs: {
+            description: {
+                component: authSplitLayoutDescription,
+            },
+        },
+    },
+} satisfies Meta<typeof AuthSplitLayout>;
+
+export default meta;
+type Story = StoryObj<typeof meta>;
+
+const loginArgs = {
+    headline: 'Good to see you again.',
+    blurb: 'Sign in to pick up where you left off with our partner breweries.',
+};
+
+const registerArgs = {
+    headline: 'Pull up a chair.',
+    blurb: 'Create an account to explore partner breweries and their beers.',
+};
+
+export const Login: Story = {
+    args: {
+        ...loginArgs,
+        children: <LoginPanel />,
+    },
+    play: async ({ canvasElement }) => {
+        const canvas = within(canvasElement);
+        await expect(canvas.getByRole('heading', { name: 'Sign in' })).toBeInTheDocument();
+        await expect(canvas.getByRole('button', { name: /show password/i })).toBeInTheDocument();
+    },
+};
+
+export const LoginWithServerError: Story = {
+    args: {
+        ...loginArgs,
+        children: <LoginPanel error="Invalid username or password." />,
+    },
+    play: async ({ canvasElement }) => {
+        const canvas = within(canvasElement);
+        await expect(canvas.getByRole('alert')).toHaveTextContent('Invalid username or password.');
+    },
+};
+
+export const Register: Story = {
+    args: {
+        ...registerArgs,
+        children: <RegisterPanel />,
+    },
+    play: async ({ canvasElement }) => {
+        const canvas = within(canvasElement);
+        await expect(canvas.getByText(/step 1 of 3 · account/i)).toBeInTheDocument();
+        await expect(canvas.getByRole('button', { name: /continue/i })).toBeInTheDocument();
+    },
+};
+
+export const RegisterFinalStep: Story = {
+    args: Register.args,
+    play: async ({ canvasElement }) => {
+        const canvas = within(canvasElement);
+        await userEvent.type(canvas.getByLabelText(/^username$/i), 'jane_doe');
+        await userEvent.type(canvas.getByLabelText(/^email$/i), 'jane@example.com');
+        await userEvent.click(canvas.getByRole('button', { name: /continue/i }));
+
+        await userEvent.type(await canvas.findByLabelText(/first name/i), 'Jane');
+        await userEvent.type(canvas.getByLabelText(/last name/i), 'Doe');
+        await fireEvent.change(canvas.getByLabelText(/date of birth/i), {
+            target: { value: '2000-01-15' },
+        });
+        await userEvent.click(canvas.getByRole('button', { name: /continue/i }));
+
+        await expect(
+            await canvas.findByRole('heading', { name: 'Secure your account' }),
+        ).toBeInTheDocument();
+        await expect(canvas.getByRole('button', { name: /create account/i })).toBeInTheDocument();
+    },
+};
+
+export const RegisterMobile: Story = {
+    args: Register.args,
+    parameters: {
+        viewport: {
+            defaultViewport: 'mobile1',
+        },
+    },
+};