frontend/src/lib/recipes/IngredientList.svelte

@@ -0,0 +1,30 @@
+<script lang="ts">
+	import type { Ingredient } from './types';
+
+	let { ingredients }: { ingredients: Ingredient[] } = $props();
+
+	const sortedIngredients = $derived(
+		[...ingredients].sort((a, b) => (a.sortOrder ?? 0) - (b.sortOrder ?? 0))
+	);
+</script>
+
+<section>
+	<h2
+		class="text-[12px] font-medium font-sans tracking-[0.08em] uppercase text-[var(--color-text-muted)] mb-[16px]"
+	>
+		Zutaten
+	</h2>
+
+	<ul>
+		{#each sortedIngredients as ingredient (ingredient.ingredientId ?? ingredient.name)}
+			<li class="flex items-baseline gap-[12px] py-[8px] border-b border-[var(--color-border)] last:border-b-0">
+				{#if ingredient.quantity != null}
+					<span class="text-[13px] font-medium text-[var(--color-text)] w-[80px] shrink-0">
+						{ingredient.quantity}{ingredient.unit != null ? ` ${ingredient.unit}` : ''}
+					</span>
+				{/if}
+				<span class="text-[14px] text-[var(--color-text)]">{ingredient.name}</span>
+			</li>
+		{/each}
+	</ul>
+</section>

frontend/src/lib/recipes/IngredientList.test.ts

@@ -0,0 +1,57 @@
+import { describe, it, expect } from 'vitest';
+import { render, screen } from '@testing-library/svelte';
+import IngredientList from './IngredientList.svelte';
+
+const mockIngredients = [
+	{ ingredientId: 'i1', name: 'Spaghetti', quantity: 200, unit: 'g' },
+	{ ingredientId: 'i2', name: 'Hackfleisch', quantity: 400, unit: 'g' },
+	{ ingredientId: 'i3', name: 'Salz', quantity: undefined, unit: undefined }
+];
+
+describe('IngredientList', () => {
+	it('renders the section heading', () => {
+		render(IngredientList, { props: { ingredients: mockIngredients } });
+		expect(screen.getByText(/zutaten/i)).toBeInTheDocument();
+	});
+
+	it('renders a row for each ingredient', () => {
+		render(IngredientList, { props: { ingredients: mockIngredients } });
+		expect(screen.getByText('Spaghetti')).toBeInTheDocument();
+		expect(screen.getByText('Hackfleisch')).toBeInTheDocument();
+		expect(screen.getByText('Salz')).toBeInTheDocument();
+	});
+
+	it('renders quantity and unit when present', () => {
+		render(IngredientList, { props: { ingredients: mockIngredients } });
+		expect(screen.getByText('200 g')).toBeInTheDocument();
+		expect(screen.getByText('400 g')).toBeInTheDocument();
+	});
+
+	it('renders no quantity when not present', () => {
+		render(IngredientList, { props: { ingredients: mockIngredients } });
+		expect(screen.queryByText('undefined')).not.toBeInTheDocument();
+	});
+
+	it('has no remove buttons (read-only)', () => {
+		render(IngredientList, { props: { ingredients: mockIngredients } });
+		expect(screen.queryByRole('button')).not.toBeInTheDocument();
+	});
+
+	it('renders empty state when ingredients array is empty', () => {
+		render(IngredientList, { props: { ingredients: [] } });
+		expect(screen.getByText(/zutaten/i)).toBeInTheDocument();
+	});
+
+	it('renders ingredients sorted by sortOrder', () => {
+		const unsorted = [
+			{ ingredientId: 'i3', name: 'Oregano', quantity: 1, unit: 'TL', sortOrder: 3 },
+			{ ingredientId: 'i1', name: 'Spaghetti', quantity: 200, unit: 'g', sortOrder: 1 },
+			{ ingredientId: 'i2', name: 'Hackfleisch', quantity: 400, unit: 'g', sortOrder: 2 }
+		];
+		render(IngredientList, { props: { ingredients: unsorted } });
+		const spans = document.querySelectorAll('li span:last-child');
+		expect(spans[0].textContent).toBe('Spaghetti');
+		expect(spans[1].textContent).toBe('Hackfleisch');
+		expect(spans[2].textContent).toBe('Oregano');
+	});
+});

frontend/src/lib/recipes/RecipeHero.svelte

@@ -0,0 +1,70 @@
+<script lang="ts">
+	import type { Tag } from './types';
+
+	type RecipeHeroData = {
+		id: string;
+		name: string;
+		serves?: number;
+		cookTimeMin?: number;
+		effort?: string;
+		heroImageUrl?: string;
+		tags: Tag[];
+	};
+
+	let { recipe }: { recipe: RecipeHeroData } = $props();
+
+	let hasImage = $derived(!!recipe.heroImageUrl);
+
+	let pillBase = $derived(
+		hasImage
+			? 'bg-white/20 text-[13px] font-medium font-sans px-[10px] py-[4px] rounded-full'
+			: 'bg-[var(--color-border)] text-[var(--color-text-muted)] text-[13px] font-medium font-sans px-[10px] py-[4px] rounded-full'
+	);
+
+	let cookBtnClass = $derived(
+		hasImage
+			? 'font-sans text-[13px] font-medium tracking-[0.04em] bg-white text-[var(--green-dark)] rounded-[var(--radius-md)] px-[24px] py-[12px] mt-[16px] inline-block'
+			: 'font-sans text-[13px] font-medium tracking-[0.04em] bg-[var(--green-dark)] text-white rounded-[var(--radius-md)] px-[24px] py-[12px] mt-[16px] inline-block'
+	);
+</script>
+
+<div
+	data-testid="recipe-hero"
+	class="min-h-[200px] md:min-h-[240px] {hasImage
+		? 'relative text-white'
+		: 'bg-[var(--green-tint)] text-[var(--color-text)]'} p-[24px] md:p-[32px]"
+>
+	{#if hasImage}
+		<img
+			src={recipe.heroImageUrl}
+			alt={recipe.name}
+			class="object-cover w-full h-full absolute inset-0"
+		/>
+		<div class="absolute inset-0" style="background: rgba(0,0,0,0.5);"></div>
+	{/if}
+
+	<div class="relative">
+		<a href="/recipes" class="text-[13px] font-sans font-medium text-[var(--color-text-muted)]">← Zurück</a>
+
+		<h1 class="font-[var(--font-display)] text-[24px] md:text-[28px] mt-[8px]">
+			{recipe.name}
+		</h1>
+
+		<div class="flex gap-[8px] flex-wrap mt-[12px]">
+			{#if recipe.cookTimeMin != null}
+				<span class={pillBase}>{recipe.cookTimeMin} Min</span>
+			{/if}
+			{#if recipe.effort}
+				<span class={pillBase}>{recipe.effort}</span>
+			{/if}
+			{#if recipe.serves != null}
+				<span class={pillBase}>{recipe.serves} Port.</span>
+			{/if}
+			{#each recipe.tags as tag (tag.id)}
+				<span class={pillBase}>{tag.name}</span>
+			{/each}
+		</div>
+
+		<a href="/cook/{recipe.id}" class={cookBtnClass}>Jetzt kochen</a>
+	</div>
+</div>

frontend/src/lib/recipes/RecipeHero.test.ts

@@ -0,0 +1,87 @@
+import { describe, it, expect } from 'vitest';
+import { render, screen } from '@testing-library/svelte';
+import RecipeHero from './RecipeHero.svelte';
+
+const baseRecipe = {
+	id: 'r1',
+	name: 'Spaghetti Bolognese',
+	serves: 4,
+	cookTimeMin: 30,
+	effort: 'Easy',
+	heroImageUrl: undefined as string | undefined,
+	tags: [] as { id: string; name: string; tagType?: string }[]
+};
+
+describe('RecipeHero', () => {
+	it('renders the recipe name', () => {
+		render(RecipeHero, { props: { recipe: baseRecipe } });
+		expect(screen.getByText('Spaghetti Bolognese')).toBeInTheDocument();
+	});
+
+	it('renders green-tint hero when no image', () => {
+		render(RecipeHero, { props: { recipe: baseRecipe } });
+		const hero = document.querySelector('[data-testid="recipe-hero"]');
+		expect(hero?.className).toContain('bg-[var(--green-tint)]');
+	});
+
+	it('renders image when heroImageUrl is provided', () => {
+		render(RecipeHero, {
+			props: { recipe: { ...baseRecipe, heroImageUrl: '/uploads/pasta.jpg' } }
+		});
+		const img = screen.getByRole('img', { name: /spaghetti bolognese/i });
+		expect(img).toHaveAttribute('src', '/uploads/pasta.jpg');
+	});
+
+	it('renders cook time pill', () => {
+		render(RecipeHero, { props: { recipe: baseRecipe } });
+		expect(screen.getByText(/30 Min/)).toBeInTheDocument();
+	});
+
+	it('renders effort pill', () => {
+		render(RecipeHero, { props: { recipe: baseRecipe } });
+		expect(screen.getByText(/Easy/)).toBeInTheDocument();
+	});
+
+	it('renders serves pill', () => {
+		render(RecipeHero, { props: { recipe: baseRecipe } });
+		expect(screen.getByText(/4/)).toBeInTheDocument();
+	});
+
+	it('renders back link to /recipes', () => {
+		render(RecipeHero, { props: { recipe: baseRecipe } });
+		const backLink = screen.getByRole('link', { name: /zurück/i });
+		expect(backLink).toHaveAttribute('href', '/recipes');
+	});
+
+	it('renders cook now link to /cook/[id]', () => {
+		render(RecipeHero, { props: { recipe: baseRecipe } });
+		const cookLink = screen.getByRole('link', { name: /jetzt kochen/i });
+		expect(cookLink).toHaveAttribute('href', '/cook/r1');
+	});
+
+	it('does not render img when no heroImageUrl', () => {
+		render(RecipeHero, { props: { recipe: baseRecipe } });
+		expect(screen.queryByRole('img')).not.toBeInTheDocument();
+	});
+
+	it('renders tag pills', () => {
+		render(RecipeHero, {
+			props: {
+				recipe: {
+					...baseRecipe,
+					tags: [
+						{ id: 't1', name: 'Pasta' },
+						{ id: 't2', name: 'Italienisch' }
+					]
+				}
+			}
+		});
+		expect(screen.getByText('Pasta')).toBeInTheDocument();
+		expect(screen.getByText('Italienisch')).toBeInTheDocument();
+	});
+
+	it('renders no tag pills when tags array is empty', () => {
+		render(RecipeHero, { props: { recipe: { ...baseRecipe, tags: [] } } });
+		expect(screen.queryByText('Pasta')).not.toBeInTheDocument();
+	});
+});

frontend/src/lib/recipes/StepList.svelte

@@ -0,0 +1,33 @@
+<script lang="ts">
+	import type { Step } from './types';
+
+	let { steps }: { steps: Step[] } = $props();
+
+	const sortedSteps = $derived(
+		[...steps].sort((a, b) => (a.stepNumber ?? 0) - (b.stepNumber ?? 0))
+	);
+</script>
+
+<section>
+	<h2
+		class="text-[12px] font-medium font-sans tracking-[0.08em] uppercase text-[var(--color-text-muted)] mb-[16px]"
+	>
+		Zubereitung
+	</h2>
+	<ol>
+		{#each sortedSteps as step (step.stepNumber)}
+			<li class="flex gap-[16px] items-start mb-[20px]">
+				<div
+					data-testid="step-circle"
+					aria-hidden="true"
+					class="w-[28px] h-[28px] rounded-full bg-[var(--green-dark)] text-white flex items-center justify-center shrink-0 font-sans text-[13px] font-medium"
+				>
+					{step.stepNumber}
+				</div>
+				<p class="text-[14px] text-[var(--color-text)] leading-[1.6] pt-[4px]">
+					{step.instruction}
+				</p>
+			</li>
+		{/each}
+	</ol>
+</section>

frontend/src/lib/recipes/StepList.test.ts

@@ -0,0 +1,50 @@
+import { describe, it, expect } from 'vitest';
+import { render, screen } from '@testing-library/svelte';
+import StepList from './StepList.svelte';
+
+const mockSteps = [
+	{ stepNumber: 1, instruction: 'Wasser zum Kochen bringen' },
+	{ stepNumber: 2, instruction: 'Spaghetti al dente kochen' },
+	{ stepNumber: 3, instruction: 'Sauce bereiten' }
+];
+
+describe('StepList', () => {
+	it('renders the section heading', () => {
+		render(StepList, { props: { steps: mockSteps } });
+		expect(screen.getByText(/zubereitung/i)).toBeInTheDocument();
+	});
+
+	it('renders each step instruction', () => {
+		render(StepList, { props: { steps: mockSteps } });
+		expect(screen.getByText('Wasser zum Kochen bringen')).toBeInTheDocument();
+		expect(screen.getByText('Spaghetti al dente kochen')).toBeInTheDocument();
+		expect(screen.getByText('Sauce bereiten')).toBeInTheDocument();
+	});
+
+	it('renders step numbers', () => {
+		render(StepList, { props: { steps: mockSteps } });
+		expect(screen.getByText('1')).toBeInTheDocument();
+		expect(screen.getByText('2')).toBeInTheDocument();
+		expect(screen.getByText('3')).toBeInTheDocument();
+	});
+
+	it('renders numbered circles with step numbers', () => {
+		render(StepList, { props: { steps: mockSteps } });
+		const circles = document.querySelectorAll('[data-testid="step-circle"]');
+		expect(circles).toHaveLength(3);
+	});
+
+	it('renders steps in stepNumber order', () => {
+		const shuffled = [mockSteps[2], mockSteps[0], mockSteps[1]];
+		render(StepList, { props: { steps: shuffled } });
+		const circles = document.querySelectorAll('[data-testid="step-circle"]');
+		expect(circles[0].textContent).toBe('1');
+		expect(circles[1].textContent).toBe('2');
+		expect(circles[2].textContent).toBe('3');
+	});
+
+	it('renders empty state when no steps', () => {
+		render(StepList, { props: { steps: [] } });
+		expect(screen.getByText(/zubereitung/i)).toBeInTheDocument();
+	});
+});

frontend/src/lib/recipes/types.ts

@@ -5,3 +5,34 @@ export type RecipeSummary = {
 	effort?: string;
 	heroImageUrl?: string;
 };
+
+export type Tag = {
+	id: string;
+	name: string;
+	tagType?: string;
+};
+
+export type Ingredient = {
+	ingredientId?: string;
+	name?: string;
+	quantity?: number;
+	unit?: string;
+	sortOrder?: number;
+};
+
+export type Step = {
+	stepNumber?: number;
+	instruction?: string;
+};
+
+export type RecipeDetail = {
+	id: string;
+	name: string;
+	serves?: number;
+	cookTimeMin?: number;
+	effort?: string;
+	heroImageUrl?: string;
+	ingredients: Ingredient[];
+	steps: Step[];
+	tags: Tag[];
+};

frontend/src/routes/(app)/recipes/[id]/+page.server.ts

@@ -0,0 +1,41 @@
+import { error } from '@sveltejs/kit';
+import type { PageServerLoad } from './$types';
+import { apiClient } from '$lib/server/api';
+
+export const load: PageServerLoad = async ({ fetch, params }) => {
+	const api = apiClient(fetch);
+	const { data, error: apiError } = await api.GET('/v1/recipes/{id}', {
+		params: { path: { id: params.id } }
+	});
+
+	if (apiError || !data) {
+		error(404, 'Recipe not found');
+	}
+
+	return {
+		recipe: {
+			id: data.id!,
+			name: data.name!,
+			serves: data.serves,
+			cookTimeMin: data.cookTimeMin,
+			effort: data.effort,
+			heroImageUrl: data.heroImageUrl,
+			ingredients: (data.ingredients ?? []).map((ing) => ({
+				ingredientId: ing.ingredientId,
+				name: ing.name,
+				quantity: ing.quantity,
+				unit: ing.unit,
+				sortOrder: ing.sortOrder
+			})),
+			steps: (data.steps ?? []).map((s) => ({
+				stepNumber: s.stepNumber,
+				instruction: s.instruction
+			})),
+			tags: (data.tags ?? []).map((t) => ({
+				id: t.id!,
+				name: t.name!,
+				tagType: t.tagType
+			}))
+		}
+	};
+};

frontend/src/routes/(app)/recipes/[id]/+page.svelte

@@ -0,0 +1,34 @@
+<script lang="ts">
+	import RecipeHero from '$lib/recipes/RecipeHero.svelte';
+	import IngredientList from '$lib/recipes/IngredientList.svelte';
+	import StepList from '$lib/recipes/StepList.svelte';
+	import type { RecipeDetail } from '$lib/recipes/types';
+
+	let { data }: { data: { recipe: RecipeDetail } } = $props();
+</script>
+
+<svelte:head>
+	<title>{data.recipe.name} — Mealplan</title>
+</svelte:head>
+
+<div>
+	<div class="hidden md:flex items-center justify-end px-[24px] py-[12px] border-b border-[var(--color-border)]">
+		<a
+			href="/recipes/{data.recipe.id}/edit"
+			class="border border-[var(--color-border)] text-[var(--color-text)] text-[13px] font-medium font-sans tracking-[0.04em] rounded-[var(--radius-md)] px-[16px] py-[8px]"
+		>
+			Bearbeiten
+		</a>
+	</div>
+
+	<RecipeHero recipe={data.recipe} />
+
+	<div class="md:flex">
+		<div class="md:flex-1 md:border-r md:border-[var(--color-border)] p-[24px]">
+			<IngredientList ingredients={data.recipe.ingredients} />
+		</div>
+		<div class="md:flex-1 p-[24px]">
+			<StepList steps={data.recipe.steps} />
+		</div>
+	</div>
+</div>

frontend/src/routes/(app)/recipes/[id]/page.server.test.ts

@@ -0,0 +1,66 @@
+import { describe, it, expect, vi, beforeEach } from 'vitest';
+
+vi.mock('$env/dynamic/private', () => ({
+	env: { BACKEND_URL: 'http://localhost:8080' }
+}));
+
+const mockGet = vi.fn();
+vi.mock('$lib/server/api', () => ({
+	apiClient: () => ({ GET: mockGet })
+}));
+
+describe('recipe detail page — load', () => {
+	let load: any;
+
+	beforeEach(async () => {
+		mockGet.mockReset();
+		vi.resetModules();
+		const mod = await import('./+page.server');
+		load = mod.load;
+	});
+
+	const mockRecipe = {
+		id: 'r1',
+		name: 'Spaghetti Bolognese',
+		serves: 4,
+		cookTimeMin: 30,
+		effort: 'Easy',
+		heroImageUrl: undefined,
+		ingredients: [
+			{ ingredientId: 'i1', name: 'Spaghetti', quantity: 200, unit: 'g' }
+		],
+		steps: [{ stepNumber: 1, instruction: 'Kochen' }],
+		tags: []
+	};
+
+	it('fetches recipe from GET /v1/recipes/{id}', async () => {
+		mockGet.mockResolvedValue({ data: mockRecipe, error: undefined });
+		await load({ fetch: vi.fn(), params: { id: 'r1' } } as any);
+		expect(mockGet).toHaveBeenCalledWith('/v1/recipes/{id}', expect.objectContaining({
+			params: { path: { id: 'r1' } }
+		}));
+	});
+
+	it('returns recipe data on success', async () => {
+		mockGet.mockResolvedValue({ data: mockRecipe, error: undefined });
+		const result = await load({ fetch: vi.fn(), params: { id: 'r1' } } as any);
+		expect(result.recipe.name).toBe('Spaghetti Bolognese');
+		expect(result.recipe.serves).toBe(4);
+	});
+
+	it('throws 404 error when API returns error', async () => {
+		mockGet.mockResolvedValue({ data: undefined, error: { status: 404 } });
+		await expect(
+			load({ fetch: vi.fn(), params: { id: 'nonexistent' } } as any)
+		).rejects.toMatchObject({ status: 404 });
+	});
+
+	it('throws 404 error when API returns 403 (different household — intentional)', async () => {
+		// Security design: we return 404 for both "not found" and "forbidden"
+		// to avoid revealing resource existence to unauthorized users
+		mockGet.mockResolvedValue({ data: undefined, error: { status: 403 } });
+		await expect(
+			load({ fetch: vi.fn(), params: { id: 'r-other-household' } } as any)
+		).rejects.toMatchObject({ status: 404 });
+	});
+});

frontend/src/routes/(app)/recipes/[id]/page.test.ts

@@ -0,0 +1,92 @@
+import { describe, it, expect } from 'vitest';
+import { render, screen } from '@testing-library/svelte';
+import Page from './+page.svelte';
+
+const mockData = {
+	recipe: {
+		id: 'r1',
+		name: 'Spaghetti Bolognese',
+		serves: 4,
+		cookTimeMin: 30,
+		effort: 'Easy',
+		heroImageUrl: undefined as string | undefined,
+		ingredients: [
+			{ ingredientId: 'i1', name: 'Spaghetti', quantity: 200, unit: 'g' },
+			{ ingredientId: 'i2', name: 'Hackfleisch', quantity: 400, unit: 'g' }
+		],
+		steps: [
+			{ stepNumber: 1, instruction: 'Wasser aufsetzen' },
+			{ stepNumber: 2, instruction: 'Sauce zubereiten' }
+		],
+		tags: [{ id: 't1', name: 'Pasta', tagType: 'category' }]
+	}
+};
+
+describe('recipe detail page', () => {
+	it('renders the recipe name', () => {
+		render(Page, { props: { data: mockData } });
+		expect(screen.getByText('Spaghetti Bolognese')).toBeInTheDocument();
+	});
+
+	it('renders page title', () => {
+		render(Page, { props: { data: mockData } });
+		expect(document.title).toBe('Spaghetti Bolognese — Mealplan');
+	});
+
+	it('renders back link to /recipes', () => {
+		render(Page, { props: { data: mockData } });
+		const backLink = screen.getByRole('link', { name: /zurück/i });
+		expect(backLink).toHaveAttribute('href', '/recipes');
+	});
+
+	it('renders cook now link to /cook/[id]', () => {
+		render(Page, { props: { data: mockData } });
+		const cookLink = screen.getByRole('link', { name: /jetzt kochen/i });
+		expect(cookLink).toHaveAttribute('href', '/cook/r1');
+	});
+
+	it('renders ingredients section heading', () => {
+		render(Page, { props: { data: mockData } });
+		expect(screen.getByText(/zutaten/i)).toBeInTheDocument();
+	});
+
+	it('renders steps section heading', () => {
+		render(Page, { props: { data: mockData } });
+		expect(screen.getByText(/zubereitung/i)).toBeInTheDocument();
+	});
+
+	it('renders ingredient names', () => {
+		render(Page, { props: { data: mockData } });
+		expect(screen.getByText('Spaghetti')).toBeInTheDocument();
+		expect(screen.getByText('Hackfleisch')).toBeInTheDocument();
+	});
+
+	it('renders step instructions', () => {
+		render(Page, { props: { data: mockData } });
+		expect(screen.getByText('Wasser aufsetzen')).toBeInTheDocument();
+		expect(screen.getByText('Sauce zubereiten')).toBeInTheDocument();
+	});
+
+	it('renders edit link to /recipes/[id]/edit', () => {
+		render(Page, { props: { data: mockData } });
+		const editLink = screen.getByRole('link', { name: /bearbeiten/i });
+		expect(editLink).toHaveAttribute('href', '/recipes/r1/edit');
+	});
+
+	it('renders tag pills in hero', () => {
+		render(Page, { props: { data: mockData } });
+		expect(screen.getByText('Pasta')).toBeInTheDocument();
+	});
+
+	it('renders hero image when heroImageUrl is provided', () => {
+		render(Page, {
+			props: {
+				data: {
+					recipe: { ...mockData.recipe, heroImageUrl: '/uploads/pasta.jpg' }
+				}
+			}
+		});
+		const img = screen.getByRole('img', { name: /spaghetti bolognese/i });
+		expect(img).toHaveAttribute('src', '/uploads/pasta.jpg');
+	});
+});