chore(release): version 0.4.0

Co-Authored-By: Claude Opus 5.5 <noreply@anthropic.com>

CHANGELOG.md

@@ -7,6 +7,46 @@ die Versionierung [Semantic Versioning](https://semver.org/lang/de/).
 
 ## [Unreleased]
 
+## [0.4.0] - 2026-10-25
+
+Ein neues Gesicht: Bricktrack sieht jetzt aus wie das, was es verwaltet.
+Dazu alle bekannten Sicherheitslücken in den Abhängigkeiten geschlossen.
+
+### Sicherheit
+
+- Next.js 15.5.28: schließt unter anderem eine Denial-of-Service-Lücke über
+  Server Actions und Cache-Poisoning bei selbst gehosteten Instanzen. Die
+  kritische Lücke in der Bildoptimierung war hier nicht ausnutzbar
+  (`images.unoptimized`), ist aber ebenfalls behoben.
+- nodemailer 10.2: mehrere Fehler im Adressparser (Erinnerungs-Mails).
+- better-auth 1.7.12, sharp 0.35.5 (librsvg), zod 4.6.7 (Speicherverbrauch
+  bei übergroßen Eingaben), drizzle-orm 0.45.4.
+- Entwicklungswerkzeuge: vitest, vite, postcss, Playwright und die
+  shadcn-CLI aktualisiert, transitive Pakete per `pnpm.overrides` angehoben.
+  Übrig bleibt ein mittlerer Fund in einem alten esbuild, das drizzle-kit
+  intern mitbringt - nur beim Entwickeln, nicht im Image.
+
+### Hinzugefügt
+
+- **Designauswahl** unter Konto → Design: Klemmbaustein (neuer Standard),
+  Warm, Nachtblau (dunkel), Bonbon, Bauklotz und Schlicht (der bisherige
+  Look). Die Wahl gilt pro Gerät und wirkt sofort.
+- **Platzhalter für Sets ohne Bild**: Farbe des Herstellers, gezeichneter
+  Stein und Setnummer statt eines grauen „Bild fehlt".
+- **Startseite als Überblick**: Steinreihe für den Fortschritt (bei mehreren
+  Sammlern in deren Farben), Teile, Wert, nächster Wunschlisten-Termin mit
+  Countdown und Abkürzungen.
+- Neues Logo als Baustein, Schriften lokal gebündelt (kein CDN).
+
+### Geändert
+
+- Karten, Buttons und Badges tragen im Standard-Design Konturen, eine feste
+  Unterkante und Noppen. In der Sammlung und auf der öffentlichen
+  Wunschliste zeigen die Noppen den Sammler bzw. ob ein Wunsch reserviert ist.
+- Die öffentliche Wunschliste hat einen farbigen Kopf mit Anlass und Datum.
+- Screenshots der Anleitung zeigen die feste Navigation nicht mehr mitten
+  im Bild.
+
 ## [0.3.0] - 2026-09-07
 
 Phase 3: mehrere Kinder, Wertentwicklung, Erinnerungen und ein Schutz vor
@@ -194,7 +234,8 @@ Erste lauffaehige Fassung: Phase 1 vollstaendig, im Docker-Stack verifiziert.
 - Unter Windows scheitert `pnpm build` an fehlenden Symlink-Rechten. Der
   Docker-Build unter Linux ist davon nicht betroffen.
 
-[Unreleased]: https://git.wilde-server.de/florian.wilde/bricktrack/compare/v0.3.0...HEAD
+[Unreleased]: https://git.wilde-server.de/florian.wilde/bricktrack/compare/v0.4.0...HEAD
+[0.4.0]: https://git.wilde-server.de/florian.wilde/bricktrack/releases/tag/v0.4.0
 [0.3.0]: https://git.wilde-server.de/florian.wilde/bricktrack/releases/tag/v0.3.0
 [0.2.0]: https://git.wilde-server.de/florian.wilde/bricktrack/releases/tag/v0.2.0
 [0.1.0]: https://git.wilde-server.de/florian.wilde/bricktrack/releases/tag/v0.1.0

CLAUDE.md

@@ -63,6 +63,16 @@ Bild-URLs, die der Nutzer selbst hinterlegt hat.
 | `src/lib/reminder-job.ts`, `src/lib/mailer.ts` | Versand und Zeitplan |
 | `src/lib/export.ts` | Export und Import des gesamten Bestands |
 | `src/lib/money.ts`, `src/lib/format.ts` | Cent-Umrechnung, dd.MM.yyyy |
+| `src/lib/design.ts`, `src/app/designs.css` | Designs: Namen und Cookie bzw. Tokens je `data-design` |
+| `src/components/brick/` | Noppen, Logo, Platzhalter fuer Sets ohne Bild |
+
+### Designs
+
+Das Design steht als `data-design` am `<html>` (Cookie `bricktrack-design`,
+pro Geraet, Standard `klemmbaustein`). Komponenten benutzen nur Tokens
+(`bg-primary`, `border-edge`, `--edge-w`, `--lift`, `bg-tone-1` ...), nie feste
+Farben - sonst stimmt ein Design nicht mehr. Karten mit Noppen: `<Studs />`
+neben die Karte in einen `relative`-Wrapper, die Karte selbst mit `brick`.
 
 ## Befehle
 
@@ -203,6 +213,8 @@ Session.
   Einladungen, Export/Import, PWA. *Fertig in 0.2.0.*
 - **Phase 3 (Nice to have)** - mehrere Sammler, Preisbeobachtung,
   E-Mail-Erinnerungen, Dublettenpruefung. *Fertig in 0.3.0.*
+- **Design und Sicherheit** - Designauswahl (Standard Klemmbaustein),
+  Abhaengigkeiten ohne bekannte Luecken. *Fertig in 0.4.0.*
 
 Details und Stand: `docs/ROADMAP.md`. Zeitaufwaende: `docs/DEVLOG.md`.
 

docs/ANLEITUNG.md

@@ -32,6 +32,7 @@ Kinderzimmer, nicht für den Schreibtisch.
 18. [Erinnerung vor dem Termin](#18-erinnerungen)
 19. [Schutz vor doppelten Einträgen](#19-dubletten)
 20. [Antworten auf die zwei wichtigen Fragen](#20-die-zwei-fragen)
+21. [Ein anderes Design](#21-design)
 
 ---
 
@@ -52,17 +53,20 @@ gleich danach unter „Konto" (siehe [Abschnitt 10](#10-passkeys-einrichten)).
 
 ![Startseite](bilder/02-start.png)
 
-Die Startseite ist die Abzweigung zu den vier Bereichen:
+Die Startseite zeigt auf einen Blick, wo die Sammlung steht:
 
 | | |
 |---|---|
-| **Katalog** | Alle bekannten Sets – egal ob vorhanden oder nicht |
+| **Steinreihe** | Zehn Plätze für den ganzen Katalog. Jeder volle Stein ist ein Zehntel, das schon da ist – bei mehreren Kindern in deren Farbe |
-| **Fehlende Sets** | Der direkte Weg zu allem, was noch fehlt |
+| **Teile und Wert** | Alle verbauten Teile und was die Sammlung heute wert ist |
-| **Sammlung** | Was tatsächlich da ist |
+| **Nächster Termin** | Die nächste Wunschliste mit Datum, wie viele Tage noch bleiben und wie viel offen ist |
-| **Wunschlisten** | Zum Teilen mit Familie und Freunden |
+| **Abkürzungen** | Direkt zu den fehlenden Sets, zu den Wunschlisten oder zu einem neuen Set |
 
 Unten am Bildschirmrand liegt die Navigation – auf dem Handy mit dem Daumen
-erreichbar.
+erreichbar. Der aktive Bereich sitzt auf einer kleinen Platte.
+
+Sets ohne Bild bekommen einen farbigen Platzhalter mit der Setnummer. Jeder
+Hersteller hat seine eigene Farbe – Lego gelb, Playmobil blau, Cobi grün.
 
 ---
 
@@ -548,6 +552,27 @@ Haken dran, habt ihr es schon.
 
 ---
 
+## 21. Design
+
+![Startseite im Design Nachtblau](bilder/25-design-nachtblau.png)
+
+Unter **Konto → Design** gibt es sechs Looks zur Auswahl:
+
+| Design | |
+|---|---|
+| **Klemmbaustein** | Der Standard: Karten mit Noppen, dunkle Konturen, kräftige Steinfarben |
+| **Warm** | Ruhiger Sandton mit Ziegelrot |
+| **Nachtblau** | Dunkel mit gelbem Akzent – angenehm am Abend |
+| **Bonbon** | Weiches Lila mit Pastellfarben |
+| **Bauklotz** | Primärfarben und dicke schwarze Konturen |
+| **Schlicht** | Neutrales Grau, so wie Bricktrack bis Version 0.3 aussah |
+
+Die Auswahl wirkt sofort und gilt **für das Gerät**, nicht für das Konto: Das
+Tablet im Kinderzimmer kann bunt sein, während das Handy dunkel bleibt.
+Öffentliche Wunschlisten sehen Gäste immer im Standard-Design.
+
+---
+
 ## Kleinigkeiten, die den Alltag leichter machen
 
 - **Filter stecken in der URL.** Ein Lesezeichen auf

docs/ROADMAP.md

@@ -59,6 +59,16 @@ Laeuft vollstaendig im Docker-Stack.
       rueckt und Eintraege unreserviert sind
 - [x] Dublettenpruefung beim Anlegen von Sets
 
+## Design und Sicherheit (v0.4.0, abgeschlossen am 25.10.2026)
+
+- [x] Abhängigkeiten mit bekannten Sicherheitslücken aktualisiert
+
+- [x] Designauswahl pro Gerät, sechs Designs, Standard „Klemmbaustein"
+- [x] Platzhalter für Sets ohne Bild, neues Logo, Schriften lokal
+- [x] Startseite als Überblick mit Steinreihe und nächstem Termin
+- [ ] Filter im Katalog als Reiter statt Auswahlfelder
+- [ ] Scan-Button mittig in der unteren Navigation
+
 ## Danach
 
 Phase 1 bis 3 sind umgesetzt. Was noch offen ist, steht hier - ohne Termin

e2e/screenshots.spec.ts

@@ -19,6 +19,9 @@ function shotPath(name: string) {
 async function shoot(page: Page, name: string) {
   // Let fonts and images settle so the picture is not half-rendered.
   await page.waitForLoadState('networkidle');
+  // A fixed bottom bar would be painted where the first viewport ends, in the
+  // middle of a full-page picture. In flow it lands at the end, where it belongs.
+  await page.addStyleTag({ content: '.fixed.bottom-0 { position: static !important; }' });
   await page.screenshot({ path: shotPath(name), fullPage: true });
 }
 
@@ -117,6 +120,8 @@ test('Screenshots fuer die Anleitung', async ({ page, browser }) => {
   await visitor.getByRole('button', { name: 'Reservieren' }).click();
   await expect(visitor.getByText('Reservierung gespeichert')).toBeVisible();
   await visitor.getByRole('button', { name: 'Alles klar' }).click();
+  // Otherwise the picture catches the dialog halfway through fading out.
+  await expect(visitor.getByRole('dialog')).toBeHidden();
   await shoot(visitor, '14-reserviert');
   await visitorContext.close();
 
@@ -129,6 +134,18 @@ test('Screenshots fuer die Anleitung', async ({ page, browser }) => {
   await expect(page.getByText('Passkeys', { exact: true })).toBeVisible();
   await shoot(page, '16-konto-passkeys');
 
+  // The same start page in the dark design, then back to the default.
+  await page.getByText('Nachtblau').click();
+  await expect(page.locator('html')).toHaveAttribute('data-design', 'nacht');
+  // The look switches at once; the cookie follows with the server action.
+  await page.waitForLoadState('networkidle');
+  await visit(page, '/');
+  await expect(page.locator('html')).toHaveAttribute('data-design', 'nacht');
+  await shoot(page, '25-design-nachtblau');
+  await visit(page, '/konto');
+  await page.getByText('Klemmbaustein').click();
+  await expect(page.locator('html')).toHaveAttribute('data-design', 'klemmbaustein');
+
   // --- 12. Lego import ------------------------------------------------------
   // The screenshot container runs with a placeholder API key so the manual
   // shows the form, not the "not configured" hint. Nothing is submitted.

package.json

@@ -1,6 +1,6 @@
 {
   "name": "bricktrack",
-  "version": "0.1.0",
+  "version": "0.4.0",
   "private": true,
   "description": "Self-hosted Verwaltung fuer Spielzeug-Set-Sammlungen (Lego, Playmobil, Cobi, ...)",
   "packageManager": "pnpm@10.34.5",
@@ -23,33 +23,39 @@
     "screenshots": "node scripts/screenshots-prepare.mjs && playwright test --config=playwright.screenshots.config.ts"
   },
   "dependencies": {
-    "@better-auth/passkey": "^1.7.3",
+    "@better-auth/passkey": "^1.7.12",
+    "@fontsource-variable/archivo": "^5.3.0",
+    "@fontsource-variable/bricolage-grotesque": "^5.3.0",
+    "@fontsource-variable/fredoka": "^5.3.0",
+    "@fontsource-variable/inter": "^5.3.0",
+    "@fontsource-variable/nunito": "^5.3.0",
+    "@fontsource-variable/outfit": "^5.3.0",
     "@zxing/browser": "^0.2.1",
     "@zxing/library": "^0.23.0",
-    "better-auth": "^1.7.3",
+    "better-auth": "^1.7.12",
     "better-sqlite3": "^13.0.3",
     "class-variance-authority": "^0.7.1",
     "cn": "^0.2.6",
     "date-fns": "^4.4.0",
-    "drizzle-orm": "^0.45.2",
+    "drizzle-orm": "^0.45.4",
     "fflate": "^0.8.3",
     "lucide-react": "^1.41.0",
-    "next": "15.5.25",
+    "next": "15.5.28",
     "next-themes": "^0.4.6",
-    "nodemailer": "^10.0.0",
+    "nodemailer": "^10.2.1",
     "pdfjs-dist": "^6.3.289",
     "radix-ui": "^1.6.7",
     "react": "19.1.0",
     "react-dom": "19.1.0",
     "server-only": "^0.0.1",
-    "sharp": "^0.35.4",
+    "sharp": "^0.35.5",
     "sonner": "^2.0.8",
     "tw-animate-css": "^1.4.0",
-    "zod": "^4.5.4"
+    "zod": "^4.6.7"
   },
   "devDependencies": {
     "@eslint/eslintrc": "^3",
-    "@playwright/test": "^1.63.0",
+    "@playwright/test": "^1.64.1",
     "@tailwindcss/postcss": "^4",
     "@types/better-sqlite3": "^9.6.0",
     "@types/node": "^20",
@@ -57,15 +63,16 @@
     "@types/react": "^19",
     "@types/react-dom": "^19",
     "dotenv": "^17.4.2",
-    "drizzle-kit": "^0.31.10",
+    "drizzle-kit": "^0.31.11",
     "esbuild": "^0.25.12",
     "eslint": "^9",
-    "eslint-config-next": "15.5.25",
+    "eslint-config-next": "15.5.28",
-    "shadcn": "^4.21.0",
+    "shadcn": "^4.22.1",
     "tailwindcss": "^4",
-    "tsx": "^4.23.13",
+    "tsx": "^4.23.15",
     "typescript": "^5",
-    "vitest": "^5.0.0"
+    "vite": "^8.3.5",
+    "vitest": "^5.0.5"
   },
   "pnpm": {
     "onlyBuiltDependencies": [
@@ -73,6 +80,20 @@
       "esbuild",
       "sharp",
       "unrs-resolver"
-    ]
+    ],
+    "overrides": {
+      "postcss": "^8.5.31",
+      "vite": "^8.2.4",
+      "source-map-js": "^1.2.2",
+      "brace-expansion@<2": "^1.1.21",
+      "brace-expansion@>=4 <6": "^5.0.12",
+      "@modelcontextprotocol/sdk": "^1.32.2",
+      "undici@7": "^7.30.1",
+      "proxy-addr": "^2.0.8",
+      "body-parser@2": "^2.4.0",
+      "fast-uri@3": "^3.1.9",
+      "hono": "^4.13.11",
+      "ip-address": "^10.7.4"
+    }
   }
 }

src/app/(app)/katalog/[id]/page.tsx

@@ -1,7 +1,9 @@
 import type { Metadata } from 'next';
 import Link from 'next/link';
 import { notFound } from 'next/navigation';
-import { Check, ExternalLink, Gift, ImageOff, Pencil } from 'lucide-react';
+import { Check, ExternalLink, Gift, Pencil } from 'lucide-react';
+import { SetPlaceholder } from '@/components/brick/set-placeholder';
+import { Studs } from '@/components/brick/studs';
 import { InstructionsSection } from '@/components/katalog/instructions-section';
 import { PhotosSection } from '@/components/katalog/photos-section';
 import { PriceSection } from '@/components/katalog/price-section';
@@ -114,16 +116,22 @@ export default async function SetDetailPage({ params, searchParams }: Props) {
       </div>
 
       <div className="grid gap-6 md:grid-cols-[minmax(0,320px)_1fr]">
-        <div className="overflow-hidden rounded-xl border border-border bg-muted">
+        <div className="relative self-start">
+          <Studs count={4} />
+          <div className="brick overflow-hidden rounded-xl bg-muted">
             {image ? (
               // eslint-disable-next-line @next/next/no-img-element
               <img src={image} alt="" className="aspect-square w-full object-contain p-3" />
             ) : (
-            <div className="flex aspect-square items-center justify-center text-muted-foreground">
+              <SetPlaceholder
-              <ImageOff className="size-10" aria-hidden />
+                setNumber={set.setNumber}
-            </div>
+                manufacturerName={set.manufacturerName}
+                size="lg"
+                className="aspect-square"
+              />
             )}
           </div>
+        </div>
 
         <div className="space-y-4">
           <SetActions

src/app/(app)/konto/actions.ts

@@ -1,12 +1,16 @@
 'use server';
 
 import { revalidatePath } from 'next/cache';
-import { headers } from 'next/headers';
+import { cookies, headers } from 'next/headers';
 import { z } from 'zod';
+import { env } from '@/env';
 import { auth } from '@/lib/auth';
+import { DESIGN_COOKIE, DESIGNS } from '@/lib/design';
+import { requireUser } from '@/lib/session';
 
 const idSchema = z.object({ id: z.string().min(1) });
 const renameSchema = idSchema.extend({ name: z.string().trim().min(1).max(60) });
+const designSchema = z.object({ design: z.enum(DESIGNS) });
 
 export type ActionResult = { ok: true } | { ok: false; error: string };
 
@@ -43,3 +47,26 @@ export async function renamePasskeyAction(input: unknown): Promise<ActionResult>
   revalidatePath('/konto');
   return { ok: true };
 }
+
+/**
+ * The design is a per-device choice: a cookie, not a column on the user. That
+ * way it also covers the login page and lets two children's tablets look
+ * different.
+ */
+export async function setDesignAction(input: unknown): Promise<ActionResult> {
+  await requireUser();
+
+  const parsed = designSchema.safeParse(input);
+  if (!parsed.success) return { ok: false, error: 'Unbekanntes Design.' };
+
+  (await cookies()).set(DESIGN_COOKIE, parsed.data.design, {
+    httpOnly: true,
+    secure: env.isProduction,
+    sameSite: 'lax',
+    path: '/',
+    maxAge: 60 * 60 * 24 * 365,
+  });
+
+  revalidatePath('/', 'layout');
+  return { ok: true };
+}

src/app/(app)/konto/page.tsx

@@ -1,9 +1,11 @@
 import type { Metadata } from 'next';
-import { headers } from 'next/headers';
+import { cookies, headers } from 'next/headers';
 import { PasskeyManager, type PasskeyRow } from '@/components/auth/passkey-manager';
+import { DesignPicker } from '@/components/konto/design-picker';
 import { Badge } from '@/components/ui/badge';
 import { Card, CardContent, CardDescription, CardHeader, CardTitle } from '@/components/ui/card';
 import { auth } from '@/lib/auth';
+import { DESIGN_COOKIE, resolveDesign } from '@/lib/design';
 import { requireUser } from '@/lib/session';
 
 export const metadata: Metadata = { title: 'Konto' };
@@ -17,6 +19,7 @@ export default async function AccountPage() {
     name: passkey.name ?? null,
     createdAt: passkey.createdAt ? new Date(passkey.createdAt) : null,
   }));
+  const design = resolveDesign((await cookies()).get(DESIGN_COOKIE)?.value);
 
   return (
     <div className="space-y-6">
@@ -45,6 +48,18 @@ export default async function AccountPage() {
         </CardContent>
       </Card>
 
+      <Card>
+        <CardHeader>
+          <CardTitle>Design</CardTitle>
+          <CardDescription>
+            Gilt für dieses Gerät. Öffentliche Wunschlisten sehen Gäste im Standard-Design.
+          </CardDescription>
+        </CardHeader>
+        <CardContent>
+          <DesignPicker current={design} />
+        </CardContent>
+      </Card>
+
       <Card>
         <CardHeader>
           <CardTitle>Passkeys</CardTitle>

src/app/(app)/page.tsx

@@ -1,58 +1,186 @@
 import Link from 'next/link';
-import { Boxes, Gift, LayoutGrid, PackageSearch } from 'lucide-react';
+import { ChevronRight, Gift, PackageSearch, Plus } from 'lucide-react';
-import { Card, CardDescription, CardHeader, CardTitle } from '@/components/ui/card';
+import { cn } from 'cn';
+import { Studs } from '@/components/brick/studs';
+import { Button } from '@/components/ui/button';
+import { brickRow } from '@/lib/brick-row';
+import { collectorDotClass } from '@/lib/collector-colors';
+import { formatDate, formatNumber, pluralize } from '@/lib/format';
+import { formatEuro } from '@/lib/money';
+import { countMissingSets, getCollectionStats } from '@/lib/queries/collection';
+import { countItemsPerCollector, listCollectors } from '@/lib/queries/collectors';
+import { listWishlists } from '@/lib/queries/wishlists';
+import { daysUntil } from '@/lib/reminders';
 import { requireUser } from '@/lib/session';
 
-const shortcuts = [
+function daysLabel(days: number): string {
-  {
+  if (days === 0) return 'heute';
-    href: '/katalog',
+  if (days === 1) return 'morgen';
-    icon: LayoutGrid,
+  return `in ${days} Tagen`;
-    title: 'Katalog',
+}
-    description: 'Alle bekannten Sets durchsuchen und neue anlegen.',
-  },
-  {
-    href: '/katalog?besitz=fehlt',
-    icon: PackageSearch,
-    title: 'Fehlende Sets',
-    description: 'Was noch nicht in der Sammlung ist – direkt auf die Wunschliste.',
-  },
-  {
-    href: '/sammlung',
-    icon: Boxes,
-    title: 'Sammlung',
-    description: 'Alles, was tatsächlich da ist – mit Standort und Zustand.',
-  },
-  {
-    href: '/wunschlisten',
-    icon: Gift,
-    title: 'Wunschlisten',
-    description: 'Listen anlegen und per Link mit Familie und Freunden teilen.',
-  },
-] as const;
 
 export default async function DashboardPage() {
   const user = await requireUser();
 
+  const stats = getCollectionStats();
+  const missing = countMissingSets();
+  const totalSets = stats.setCount + missing;
+
+  const collectors = listCollectors();
+  const perCollector = countItemsPerCollector();
+  const showCollectors = collectors.length > 1;
+  const bricks = brickRow(
+    stats.setCount,
+    totalSets,
+    showCollectors
+      ? collectors.map((entry) => ({ key: entry.id, count: perCollector.get(entry.id) ?? 0 }))
+      : [],
+  );
+  const colorById = new Map(collectors.map((entry) => [entry.id, entry.color]));
+
+  // The next date someone could bring a present for.
+  const now = new Date();
+  const nextEvent =
+    listWishlists(user.id)
+      .filter((list) => list.eventDate && daysUntil(list.eventDate, now) >= 0)
+      .sort((a, b) => a.eventDate!.getTime() - b.eventDate!.getTime())[0] ?? null;
+
   return (
-    <div className="space-y-6">
+    <div className="mx-auto max-w-2xl space-y-7">
-      <div>
+      <h1 className="text-3xl font-semibold tracking-tight">Hallo {user.name}!</h1>
-        <h1 className="text-2xl font-semibold tracking-tight">Hallo {user.name}</h1>
+
-        <p className="text-sm text-muted-foreground">Was möchtest du tun?</p>
+      <section className="relative">
+        <Studs count={3} />
+        <div className="brick rounded-xl bg-card p-4 text-card-foreground">
+          <div className="flex items-baseline justify-between gap-3">
+            <h2 className="text-lg font-semibold">Unsere Sammlung</h2>
+            <p className="text-sm font-semibold text-muted-foreground">
+              {formatNumber(stats.setCount)} von {pluralize(totalSets, 'Set', 'Sets')}
+            </p>
           </div>
 
-      <div className="grid gap-3 sm:grid-cols-2">
+          <ol
-        {shortcuts.map((shortcut) => (
+            aria-label={`${formatNumber(stats.setCount)} von ${formatNumber(totalSets)} Sets vorhanden`}
-          <Link key={shortcut.href} href={shortcut.href} className="group">
+            className="mt-5 grid grid-cols-10 items-end gap-1.5"
-            <Card className="h-full transition-colors group-hover:border-primary/40">
+          >
-              <CardHeader>
+            {bricks.map((key, index) => (
-                <shortcut.icon className="size-6 text-primary" aria-hidden />
+              <li key={index} aria-hidden className="relative">
-                <CardTitle>{shortcut.title}</CardTitle>
+                {key === null ? (
-                <CardDescription>{shortcut.description}</CardDescription>
+                  <span className="block h-7 rounded-[6px] border-2 border-dashed border-muted-foreground/50" />
-              </CardHeader>
+                ) : (
-            </Card>
+                  <>
-          </Link>
+                    <span
+                      className={cn(
+                        'stud mx-auto mb-[calc(var(--edge-w)*-1)] !h-1.5 !w-3 !rounded-t-[4px] [display:var(--studs)]',
+                        key ? collectorDotClass(colorById.get(key)) : 'bg-secondary',
+                      )}
+                    />
+                    <span
+                      className={cn(
+                        'block h-7 rounded-[6px] border-[length:var(--edge-w)] border-edge',
+                        key ? collectorDotClass(colorById.get(key)) : 'bg-secondary',
+                      )}
+                    />
+                  </>
+                )}
+              </li>
             ))}
+          </ol>
+
+          {showCollectors ? (
+            <ul className="mt-3 flex flex-wrap gap-x-4 gap-y-1 text-xs font-semibold">
+              {collectors.map((entry) => (
+                <li key={entry.id} className="flex items-center gap-1.5">
+                  <span
+                    aria-hidden
+                    className={cn(
+                      'size-3 rounded-[3px] border-[length:var(--edge-w)] border-edge',
+                      collectorDotClass(entry.color),
+                    )}
+                  />
+                  {entry.name}
+                </li>
+              ))}
+              <li className="flex items-center gap-1.5 text-muted-foreground">
+                <span
+                  aria-hidden
+                  className="size-3 rounded-[3px] border-2 border-dashed border-muted-foreground/50"
+                />
+                fehlt noch
+              </li>
+            </ul>
+          ) : null}
         </div>
+      </section>
+
+      <section className="grid grid-cols-2 gap-3">
+        <div className="relative">
+          <Studs studClassName="bg-secondary" />
+          <div className="brick h-full rounded-xl bg-secondary p-4 text-secondary-foreground">
+            <p className="text-2xl font-bold tabular-nums [font-family:var(--font-display)]">
+              {formatNumber(stats.pieceCount)}
+            </p>
+            <p className="text-sm font-semibold">Teile verbaut</p>
+          </div>
+        </div>
+        <div className="relative">
+          <Studs studClassName="bg-owned" />
+          <div className="brick h-full rounded-xl bg-owned p-4 text-owned-foreground">
+            <p className="text-2xl font-bold tabular-nums [font-family:var(--font-display)]">
+              {formatEuro(stats.currentValueCents)}
+            </p>
+            <p className="text-sm font-semibold">
+              {stats.currentValueCents === stats.retailValueCents ? 'Wert nach UVP' : 'Aktueller Wert'}
+            </p>
+          </div>
+        </div>
+      </section>
+
+      {nextEvent?.eventDate ? (
+        <Link href={`/wunschlisten/${nextEvent.id}`} className="relative block rounded-xl">
+          <Studs count={4} studClassName="bg-primary" />
+          <div className="brick flex items-center gap-4 rounded-xl bg-primary p-4 text-primary-foreground">
+            <div className="flex size-14 shrink-0 flex-col items-center justify-center rounded-lg border-[length:var(--edge-w)] border-edge bg-card text-card-foreground">
+              <span className="text-xl leading-none font-bold [font-family:var(--font-display)]">
+                {formatDate(nextEvent.eventDate).slice(0, 5)}
+              </span>
+            </div>
+            <div className="min-w-0 flex-1">
+              <p className="truncate text-lg font-semibold [font-family:var(--font-display)]">
+                {nextEvent.title}
+              </p>
+              <p className="text-sm font-semibold">
+                {daysLabel(daysUntil(nextEvent.eventDate, now))} ·{' '}
+                {nextEvent.openCount === 1
+                  ? '1 Wunsch noch offen'
+                  : `${formatNumber(nextEvent.openCount)} Wünsche noch offen`}
+              </p>
+            </div>
+            <ChevronRight className="size-5 shrink-0" aria-hidden />
+          </div>
+        </Link>
+      ) : null}
+
+      <section className="flex flex-wrap gap-3">
+        <Button asChild variant="outline" size="lg">
+          <Link href="/katalog?besitz=fehlt">
+            <PackageSearch aria-hidden />
+            {missing === 1 ? '1 Set fehlt noch' : `${formatNumber(missing)} Sets fehlen noch`}
+          </Link>
+        </Button>
+        <Button asChild variant="outline" size="lg">
+          <Link href="/wunschlisten">
+            <Gift aria-hidden />
+            Wunschlisten
+          </Link>
+        </Button>
+        <Button asChild size="lg">
+          <Link href="/katalog/neu">
+            <Plus aria-hidden />
+            Set anlegen
+          </Link>
+        </Button>
+      </section>
     </div>
   );
 }

src/app/(app)/sammlung/page.tsx

@@ -1,12 +1,14 @@
 import type { Metadata } from 'next';
 import Link from 'next/link';
-import { Boxes, Euro, ImageOff, Layers, PackageSearch } from 'lucide-react';
+import { Boxes, Euro, Layers, PackageSearch } from 'lucide-react';
+import { SetPlaceholder } from '@/components/brick/set-placeholder';
+import { Studs } from '@/components/brick/studs';
 import { CollectorFilter } from '@/components/layout/collector-filter';
 import { CollectionFilters } from '@/components/sammlung/collection-filters';
 import { Badge } from '@/components/ui/badge';
 import { Card, CardContent } from '@/components/ui/card';
 import { formatDate, formatNumber, pluralize } from '@/lib/format';
-import { collectorBadgeClass } from '@/lib/collector-colors';
+import { collectorBadgeClass, collectorDotClass } from '@/lib/collector-colors';
 import { setImageSrc } from '@/lib/images';
 import { completenessLabel, statusLabel } from '@/lib/labels';
 import { formatEuro } from '@/lib/money';
@@ -122,23 +124,31 @@ export default async function SammlungPage({ searchParams }: { searchParams: Sea
           </Link>
         </div>
       ) : (
-        <ul className="divide-y divide-border rounded-lg border border-border">
+        <ul className="space-y-5 pt-2">
           {items.map((item) => {
             const image = setImageSrc(item);
             return (
-              <li key={item.id}>
+              <li key={item.id} className="relative">
+                {/* The studs carry the collector's colour once there is more than one. */}
+                <Studs
+                  studClassName={
+                    collectors.length > 1 ? collectorDotClass(item.collectorColor) : undefined
+                  }
+                />
                 <Link
                   href={`/katalog/${item.setId}`}
-                  className="flex items-center gap-3 p-3 transition-colors hover:bg-muted/50"
+                  className="brick flex items-center gap-3 rounded-xl bg-card p-3 transition-colors hover:bg-muted/50"
                 >
-                  <div className="size-14 shrink-0 overflow-hidden rounded-lg border border-border bg-muted">
+                  <div className="size-16 shrink-0 overflow-hidden rounded-lg border-[length:max(1px,var(--edge-w))] border-edge bg-muted">
                     {image ? (
                       // eslint-disable-next-line @next/next/no-img-element
                       <img src={image} alt="" loading="lazy" className="size-full object-contain" />
                     ) : (
-                      <div className="flex size-full items-center justify-center text-muted-foreground">
+                      <SetPlaceholder
-                        <ImageOff className="size-5" aria-hidden />
+                        setNumber={item.setNumber}
-                      </div>
+                        manufacturerName={item.manufacturerName}
+                        size="sm"
+                      />
                     )}
                   </div>
 
@@ -150,7 +160,11 @@ export default async function SammlungPage({ searchParams }: { searchParams: Sea
                         .join(' · ')}
                     </p>
                     <div className="mt-1 flex flex-wrap items-center gap-1">
-                      <Badge variant={item.status === 'sold' ? 'outline' : 'default'}>
+                      {/* Green like "Vorhanden" in the catalog; red stays for actions. */}
+                      <Badge
+                        variant={item.status === 'sold' ? 'outline' : 'default'}
+                        className={item.status === 'sold' ? undefined : 'bg-owned text-owned-foreground'}
+                      >
                         {statusLabel(item.status)}
                       </Badge>
                       {item.completeness !== 'unknown' ? (

src/app/(auth)/layout.tsx

@@ -1,11 +1,14 @@
 import Link from 'next/link';
-import { Blocks } from 'lucide-react';
+import { BrickLogo } from '@/components/brick/logo';
 
 export default function AuthLayout({ children }: { children: React.ReactNode }) {
   return (
     <div className="flex min-h-dvh flex-col items-center justify-center gap-8 px-4 py-10">
-      <Link href="/" className="flex items-center gap-2 text-xl font-semibold tracking-tight">
+      <Link
-        <Blocks className="size-6 text-primary" aria-hidden />
+        href="/"
+        className="flex items-center gap-2 text-2xl font-bold tracking-tight [font-family:var(--font-display)]"
+      >
+        <BrickLogo className="h-8 w-9" />
         Bricktrack
       </Link>
       <main className="w-full max-w-sm">{children}</main>

src/app/designs.css

@@ -0,0 +1,301 @@
+/*
+ * Selectable designs. Each one is a set of tokens under :root[data-design=...]
+ * (the attribute is set in the root layout from a cookie, see src/lib/design.ts).
+ * The neutral "schlicht" design uses the defaults from globals.css.
+ *
+ * Token additions on top of shadcn:
+ *   --font-display   headings and big numbers
+ *   --edge, --edge-w outline of cards, buttons and badges
+ *   --lift(-sm)      the hard bottom edge that makes a card look like a brick
+ *   --studs          "flex" shows the studs on top of cards, "none" hides them
+ *   --tone-1..5      placeholder colours for sets without an image
+ *   --owned          the "Vorhanden" badge
+ */
+
+/* --- Klemmbaustein (default) --------------------------------------------- */
+:root[data-design='klemmbaustein'] {
+  --font-sans: 'Nunito Variable', ui-sans-serif, system-ui, sans-serif;
+  --font-display: 'Fredoka Variable', ui-sans-serif, system-ui, sans-serif;
+  --radius: 1rem;
+
+  --background: #fff6e5;
+  --foreground: #24203f;
+  --card: #ffffff;
+  --card-foreground: #24203f;
+  --popover: #ffffff;
+  --popover-foreground: #24203f;
+  --primary: #d63a30;
+  --primary-foreground: #ffffff;
+  --secondary: #ffc93c;
+  --secondary-foreground: #24203f;
+  --muted: #f6ead0;
+  --muted-foreground: #5f5a78;
+  --accent: #ffe9b0;
+  --accent-foreground: #24203f;
+  --destructive: #c62828;
+  --border: rgb(36 32 63 / 0.16);
+  --input: #24203f;
+  --ring: #2f6bea;
+
+  --logo: #ffc93c;
+  --edge: #24203f;
+  --edge-w: 2px;
+  --lift: 0 4px 0 #24203f;
+  --lift-sm: 0 3px 0 #24203f;
+  --studs: flex;
+  --owned: #2ebd85;
+  --owned-foreground: #24203f;
+  --tone-ink: #24203f;
+  --tone-1: #ffe08a;
+  --tone-2: #bfd6ff;
+  --tone-3: #bdebd3;
+  --tone-4: #ffc9d9;
+  --tone-5: #e2d6ff;
+}
+
+/* --- Warm ---------------------------------------------------------------- */
+:root[data-design='warm'] {
+  --font-sans: 'Inter Variable', ui-sans-serif, system-ui, sans-serif;
+  --font-display: 'Bricolage Grotesque Variable', ui-sans-serif, system-ui, sans-serif;
+  --radius: 0.875rem;
+
+  --background: #f6f3ec;
+  --foreground: #1d1b17;
+  --card: #ffffff;
+  --card-foreground: #1d1b17;
+  --popover: #ffffff;
+  --popover-foreground: #1d1b17;
+  --primary: #c8381f;
+  --primary-foreground: #ffffff;
+  --secondary: #fbe3a6;
+  --secondary-foreground: #1d1b17;
+  --muted: #ece6da;
+  --muted-foreground: #5f594f;
+  --accent: #fbe3a6;
+  --accent-foreground: #1d1b17;
+  --destructive: #b42318;
+  --border: #e2dbcd;
+  --input: #d6cebf;
+  --ring: #c8381f;
+
+  --edge: transparent;
+  --edge-w: 0px;
+  --lift: 0 1px 2px rgb(29 27 23 / 0.06);
+  --lift-sm: none;
+  --studs: none;
+  --owned: #1f7a4d;
+  --owned-foreground: #ffffff;
+  --tone-ink: #1d1b17;
+  --tone-1: #fbe3a6;
+  --tone-2: #d6e6f5;
+  --tone-3: #dde8d2;
+  --tone-4: #f6d5cc;
+  --tone-5: #e5ddf0;
+}
+
+/* --- Nachtblau (dark) ---------------------------------------------------- */
+:root[data-design='nacht'] {
+  color-scheme: dark;
+  --font-sans: 'Inter Variable', ui-sans-serif, system-ui, sans-serif;
+  --font-display: 'Outfit Variable', ui-sans-serif, system-ui, sans-serif;
+  --radius: 1.125rem;
+
+  --background: #0e1422;
+  --foreground: #f2f4f8;
+  --card: #182136;
+  --card-foreground: #f2f4f8;
+  --popover: #1b2540;
+  --popover-foreground: #f2f4f8;
+  --primary: #ffc93c;
+  --primary-foreground: #1a1300;
+  --secondary: #222d45;
+  --secondary-foreground: #f2f4f8;
+  --muted: #222d45;
+  --muted-foreground: #a3adc2;
+  --accent: #2a3654;
+  --accent-foreground: #f2f4f8;
+  --destructive: #f87171;
+  --border: #2c3854;
+  --input: #34405e;
+  --ring: #ffc93c;
+
+  --edge: transparent;
+  --edge-w: 0px;
+  --lift: none;
+  --lift-sm: none;
+  --studs: none;
+  --owned: #1e4d3a;
+  --owned-foreground: #8fe3b8;
+  --tone-ink: #f2f4f8;
+  --tone-1: #3a3218;
+  --tone-2: #1b2c44;
+  --tone-3: #22331e;
+  --tone-4: #3d2230;
+  --tone-5: #2c2546;
+}
+
+/* --- Bonbon -------------------------------------------------------------- */
+:root[data-design='bonbon'] {
+  --font-sans: 'Nunito Variable', ui-sans-serif, system-ui, sans-serif;
+  --font-display: 'Fredoka Variable', ui-sans-serif, system-ui, sans-serif;
+  --radius: 1.5rem;
+
+  --background: #f4f0ff;
+  --foreground: #23194a;
+  --card: #ffffff;
+  --card-foreground: #23194a;
+  --popover: #ffffff;
+  --popover-foreground: #23194a;
+  --primary: #6d4aff;
+  --primary-foreground: #ffffff;
+  --secondary: #ede7ff;
+  --secondary-foreground: #4b2fc4;
+  --muted: #ede7ff;
+  --muted-foreground: #5e567c;
+  --accent: #ede7ff;
+  --accent-foreground: #23194a;
+  --destructive: #c62828;
+  --border: #e4ddf7;
+  --input: #d8cff3;
+  --ring: #6d4aff;
+
+  --edge: transparent;
+  --edge-w: 0px;
+  --lift: 0 8px 24px rgb(35 25 74 / 0.08);
+  --lift-sm: none;
+  --studs: none;
+  --owned: #157a57;
+  --owned-foreground: #ffffff;
+  --tone-ink: #23194a;
+  --tone-1: #fff1c7;
+  --tone-2: #dff0ff;
+  --tone-3: #ddf7ea;
+  --tone-4: #ffe1d1;
+  --tone-5: #ffddeb;
+}
+
+/* --- Bauklotz ------------------------------------------------------------ */
+:root[data-design='bauklotz'] {
+  --font-sans: 'Archivo Variable', ui-sans-serif, system-ui, sans-serif;
+  --font-display: 'Archivo Variable', ui-sans-serif, system-ui, sans-serif;
+  --radius: 0.75rem;
+
+  --background: #fffbef;
+  --foreground: #111111;
+  --card: #ffffff;
+  --card-foreground: #111111;
+  --popover: #ffffff;
+  --popover-foreground: #111111;
+  --primary: #1e5eff;
+  --primary-foreground: #ffffff;
+  --secondary: #ffd500;
+  --secondary-foreground: #111111;
+  --muted: #f3eedc;
+  --muted-foreground: #4a4a4a;
+  --accent: #ffd500;
+  --accent-foreground: #111111;
+  --destructive: #c62828;
+  --border: rgb(17 17 17 / 0.2);
+  --input: #111111;
+  --ring: #1e5eff;
+
+  --logo: #ffd500;
+  --edge: #111111;
+  --edge-w: 2.5px;
+  --lift: 4px 4px 0 #111111;
+  --lift-sm: 3px 3px 0 #111111;
+  --studs: none;
+  --owned: #111111;
+  --owned-foreground: #ffffff;
+  --tone-ink: #111111;
+  --tone-1: #ffd500;
+  --tone-2: #7fb2ff;
+  --tone-3: #8bd17c;
+  --tone-4: #ff8a7a;
+  --tone-5: #c9a7ff;
+}
+
+:root[data-design='bauklotz'] :is(h1, h2) {
+  font-weight: 900;
+  text-transform: uppercase;
+  letter-spacing: -0.01em;
+}
+
+/*
+ * Surfaces. Unlayered on purpose: these must win over the utility classes of
+ * the shadcn components, which carry the neutral look. Focused elements keep
+ * their ring (also a box-shadow), so the lift steps aside for it.
+ */
+[data-slot='card'] {
+  border: var(--edge-w) solid var(--edge);
+  box-shadow: var(--lift);
+}
+
+:root:is([data-design='klemmbaustein'], [data-design='bauklotz']) {
+  & [data-slot='button']:is(
+      [data-variant='default'],
+      [data-variant='outline'],
+      [data-variant='secondary'],
+      [data-variant='destructive']
+    ) {
+    border-width: var(--edge-w);
+    border-color: var(--edge);
+    font-weight: 700;
+
+    &:not(:focus-visible) {
+      box-shadow: var(--lift-sm);
+    }
+
+    &:active:not(:disabled) {
+      translate: 0 2px;
+      box-shadow: none;
+    }
+  }
+
+  & [data-slot='badge'] {
+    border-width: 2px;
+    border-color: var(--edge);
+    border-radius: calc(var(--radius) * 0.5);
+    font-weight: 800;
+  }
+
+  & :is([data-slot='input'], [data-slot='textarea'], [data-slot='native-select'], [data-slot='select-trigger']) {
+    border-width: var(--edge-w);
+    border-color: var(--edge);
+  }
+
+  & :is([data-slot='dialog-content'], [data-slot='alert-dialog-content'], [data-slot='popover-content'], [data-slot='dropdown-menu-content'], [data-slot='select-content']) {
+    border: var(--edge-w) solid var(--edge);
+    box-shadow: var(--lift);
+  }
+}
+
+/* A surface outside the shadcn components (set tiles, list entries). */
+@utility brick {
+  border: var(--edge-w) solid var(--edge);
+  box-shadow: var(--lift);
+}
+
+/* --- Studs ---------------------------------------------------------------- */
+/* In a layer, so a utility class on a stud (collector colour) still wins. */
+@layer components {
+  .studs {
+    display: var(--studs);
+    position: absolute;
+    top: calc(var(--edge-w) - 10px);
+    left: 16px;
+    gap: 10px;
+    pointer-events: none;
+  }
+
+  .stud {
+    display: block;
+    width: 20px;
+    height: 10px;
+    box-sizing: border-box;
+    border: var(--edge-w) solid var(--edge);
+    border-bottom: 0;
+    border-radius: 7px 7px 0 0;
+    background: var(--card);
+  }
+}

src/app/globals.css

@@ -1,6 +1,7 @@
 @import "tailwindcss";
 @import "tw-animate-css";
 @import "shadcn/tailwind.css";
+@import "./designs.css";
 
 @custom-variant dark (&:is(.dark *));
 
@@ -10,6 +11,7 @@
     "Segoe UI Emoji";
   --font-mono: ui-monospace, SFMono-Regular, "SF Mono", Menlo, Consolas,
     "Liberation Mono", monospace;
+  --font-display: var(--font-sans);
 }
 
 
@@ -18,7 +20,16 @@
   --color-foreground: var(--foreground);
   --font-sans: var(--font-sans);
   --font-mono: var(--font-mono);
-  --font-heading: var(--font-sans);
+  --font-heading: var(--font-display);
+  --color-edge: var(--edge);
+  --color-owned: var(--owned);
+  --color-owned-foreground: var(--owned-foreground);
+  --color-tone-ink: var(--tone-ink);
+  --color-tone-1: var(--tone-1);
+  --color-tone-2: var(--tone-2);
+  --color-tone-3: var(--tone-3);
+  --color-tone-4: var(--tone-4);
+  --color-tone-5: var(--tone-5);
   --color-sidebar-ring: var(--sidebar-ring);
   --color-sidebar-border: var(--sidebar-border);
   --color-sidebar-accent-foreground: var(--sidebar-accent-foreground);
@@ -90,6 +101,21 @@
   --sidebar-accent-foreground: oklch(0.205 0 0);
   --sidebar-border: oklch(0.922 0 0);
   --sidebar-ring: oklch(0.708 0 0);
+  /* Brick look: outline, "lift" (the hard bottom edge) and studs. The
+     neutral design has none of it; see designs.css for the others. */
+  --edge: oklch(0.145 0 0 / 10%);
+  --edge-w: 1px;
+  --lift: none;
+  --lift-sm: none;
+  --studs: none;
+  --owned: oklch(0.596 0.145 163.225);
+  --owned-foreground: oklch(1 0 0);
+  --tone-ink: oklch(0.556 0 0);
+  --tone-1: oklch(0.97 0 0);
+  --tone-2: oklch(0.97 0 0);
+  --tone-3: oklch(0.97 0 0);
+  --tone-4: oklch(0.97 0 0);
+  --tone-5: oklch(0.97 0 0);
 }
 
 .dark {
@@ -136,4 +162,9 @@
   html {
     @apply font-sans;
   }
+  h1,
+  h2,
+  h3 {
+    font-family: var(--font-display);
+  }
 }␍

src/app/layout.tsx

@@ -1,6 +1,14 @@
 import type { Metadata, Viewport } from 'next';
+import { cookies } from 'next/headers';
+import '@fontsource-variable/archivo';
+import '@fontsource-variable/bricolage-grotesque';
+import '@fontsource-variable/fredoka';
+import '@fontsource-variable/inter';
+import '@fontsource-variable/nunito';
+import '@fontsource-variable/outfit';
 import { ServiceWorkerRegistration } from '@/components/layout/service-worker';
 import { Toaster } from '@/components/ui/sonner';
+import { DESIGN_COOKIE, DESIGN_INFO, resolveDesign } from '@/lib/design';
 import './globals.css';
 
 export const metadata: Metadata = {
@@ -25,19 +33,30 @@ export const metadata: Metadata = {
   robots: { index: false, follow: false },
 };
 
-export const viewport: Viewport = {
+async function currentDesign() {
+  return resolveDesign((await cookies()).get(DESIGN_COOKIE)?.value);
+}
+
+export async function generateViewport(): Promise<Viewport> {
+  const design = await currentDesign();
+  return {
     width: 'device-width',
     initialScale: 1,
     viewportFit: 'cover',
-  themeColor: [
+    themeColor: DESIGN_INFO[design].themeColor,
-    { media: '(prefers-color-scheme: light)', color: '#ffffff' },
-    { media: '(prefers-color-scheme: dark)', color: '#0a0a0a' },
-  ],
   };
+}
+
+export default async function RootLayout({ children }: Readonly<{ children: React.ReactNode }>) {
+  const design = await currentDesign();
 
-export default function RootLayout({ children }: Readonly<{ children: React.ReactNode }>) {
   return (
-    <html lang="de" suppressHydrationWarning>
+    <html
+      lang="de"
+      data-design={design}
+      className={DESIGN_INFO[design].dark ? 'dark' : undefined}
+      suppressHydrationWarning
+    >
       <body className="min-h-dvh bg-background text-foreground antialiased">
         {children}
         <Toaster position="top-center" richColors closeButton />

src/app/w/[shareToken]/page.tsx

@@ -1,6 +1,8 @@
 import type { Metadata } from 'next';
 import { notFound } from 'next/navigation';
-import { Blocks, CalendarDays, Gift } from 'lucide-react';
+import { CalendarDays, Gift } from 'lucide-react';
+import { BrickLogo } from '@/components/brick/logo';
+import { Studs } from '@/components/brick/studs';
 import { PublicWishlist, type PublicItem } from '@/components/wunschlisten/public-wishlist';
 import { Badge } from '@/components/ui/badge';
 import { formatDate, pluralize } from '@/lib/format';
@@ -54,40 +56,45 @@ export default async function PublicWishlistPage({ params }: Props) {
   const openCount = items.filter((item) => !item.isReserved).length;
 
   return (
-    <div className="mx-auto min-h-dvh w-full max-w-2xl px-4 py-8">
+    <div className="min-h-dvh">
-      <header className="space-y-3 border-b border-border pb-6">
+      <header className="border-b-[length:max(1px,var(--edge-w))] border-edge bg-primary text-primary-foreground">
-        <div className="flex items-center gap-2 text-sm text-muted-foreground">
+        <div className="mx-auto w-full max-w-2xl space-y-3 px-4 pt-6 pb-10">
-          <Blocks className="size-4 text-primary" aria-hidden />
+          <div className="flex items-center gap-2 text-sm font-semibold">
+            <BrickLogo className="h-5 w-6" />
             Bricktrack
           </div>
 
-        <h1 className="text-2xl font-semibold tracking-tight">{list.title}</h1>
+          <h1 className="text-3xl font-semibold tracking-tight">{list.title}</h1>
 
           <div className="flex flex-wrap items-center gap-2">
-          <Badge variant="secondary" className="gap-1">
+            <Badge className="gap-1 bg-card text-card-foreground">
               <Gift className="size-3" aria-hidden />
               {occasionLabel(list.occasion)}
             </Badge>
             {list.eventDate ? (
-            <Badge variant="outline" className="gap-1">
+              <Badge className="gap-1 bg-card text-card-foreground">
                 <CalendarDays className="size-3" aria-hidden />
                 {formatDate(list.eventDate)}
               </Badge>
             ) : null}
-          <span className="text-sm text-muted-foreground">
+            <Badge variant="secondary">
               {pluralize(openCount, 'Wunsch noch offen', 'Wünsche noch offen')}
-          </span>
+            </Badge>
           </div>
+        </div>
+      </header>
 
-        {list.note ? (
+      <div className="mx-auto w-full max-w-2xl px-4 pb-8">
-          <p className="rounded-lg bg-muted p-3 text-sm whitespace-pre-line">{list.note}</p>
+        <div className="relative -mt-5">
-        ) : null}
+          <Studs />
-
+          <div className="brick space-y-2 rounded-xl bg-card p-4 text-card-foreground">
+            {list.note ? <p className="text-sm whitespace-pre-line">{list.note}</p> : null}
             <p className="text-xs text-muted-foreground">
               Klick auf „Das schenke ich“, damit niemand dasselbe doppelt kauft. Eine Anmeldung
               brauchst du dafür nicht.
             </p>
-      </header>
+          </div>
+        </div>
 
         <main className="py-6">
           {items.length === 0 ? (
@@ -99,5 +106,6 @@ export default async function PublicWishlistPage({ params }: Props) {
           )}
         </main>
       </div>
+    </div>
   );
 }

src/components/brick/logo.tsx

@@ -0,0 +1,18 @@
+/** The app mark: a 2x1 brick in the design's logo colour. */
+export function BrickLogo({ className }: { className?: string }) {
+  return (
+    <svg viewBox="0 0 38 32" aria-hidden className={className}>
+      <g
+        style={{
+          fill: 'var(--logo, var(--primary))',
+          stroke: 'var(--edge)',
+          strokeWidth: 'var(--edge-w)',
+        }}
+      >
+        <rect x="9" y="2" width="8" height="8" rx="2.5" />
+        <rect x="21" y="2" width="8" height="8" rx="2.5" />
+        <rect x="2" y="8" width="34" height="22" rx="6" />
+      </g>
+    </svg>
+  );
+}

src/components/brick/set-placeholder.tsx

@@ -0,0 +1,66 @@
+import { cn } from 'cn';
+import { toneIndex } from '@/lib/design';
+
+const TONE_CLASSES: Record<number, string> = {
+  1: 'bg-tone-1',
+  2: 'bg-tone-2',
+  3: 'bg-tone-3',
+  4: 'bg-tone-4',
+  5: 'bg-tone-5',
+};
+
+/**
+ * Stand-in for a set without an image: the manufacturer's tone, a drawn
+ * brick and the set number. Reads as intended rather than as "image broken".
+ */
+export function SetPlaceholder({
+  setNumber,
+  manufacturerName,
+  size = 'md',
+  className,
+}: {
+  setNumber: string;
+  manufacturerName: string;
+  size?: 'sm' | 'md' | 'lg';
+  className?: string;
+}) {
+  const tone = TONE_CLASSES[toneIndex(manufacturerName)];
+
+  return (
+    <div
+      className={cn(
+        'relative flex size-full items-end overflow-hidden text-tone-ink',
+        size === 'sm' ? 'p-1.5' : 'p-3',
+        tone,
+        className,
+      )}
+    >
+      {size !== 'sm' ? (
+        <svg
+          viewBox="0 0 70 44"
+          aria-hidden
+          className={cn(
+            'absolute opacity-40',
+            size === 'lg' ? 'top-[18%] right-[12%] w-2/5' : 'top-3 right-3 w-1/3',
+          )}
+        >
+          <g fill="none" stroke="currentColor" strokeWidth="2.5">
+            <rect x="12" y="2" width="16" height="10" rx="3" />
+            <rect x="42" y="2" width="16" height="10" rx="3" />
+            <rect x="2" y="10" width="66" height="32" rx="7" />
+          </g>
+        </svg>
+      ) : null}
+      <span
+        className={cn(
+          'relative leading-none font-bold tracking-tight [font-family:var(--font-display)] tabular-nums',
+          size === 'sm' && 'text-xs',
+          size === 'md' && (setNumber.length > 6 ? 'text-lg' : 'text-2xl'),
+          size === 'lg' && 'text-5xl',
+        )}
+      >
+        {setNumber}
+      </span>
+    </div>
+  );
+}

src/components/brick/studs.tsx

@@ -0,0 +1,25 @@
+import { cn } from 'cn';
+
+/**
+ * The row of studs on top of a card. Purely decorative and only visible in
+ * designs that set `--studs: flex`. The parent must be `relative` and must not
+ * clip its overflow - place it next to the card, not inside.
+ */
+export function Studs({
+  count = 2,
+  className,
+  studClassName,
+}: {
+  count?: number;
+  className?: string;
+  /** Colour of the studs, e.g. the collector's dot class. */
+  studClassName?: string;
+}) {
+  return (
+    <span aria-hidden className={cn('studs', className)}>
+      {Array.from({ length: count }, (_, index) => (
+        <span key={index} className={cn('stud', studClassName)} />
+      ))}
+    </span>
+  );
+}

src/components/katalog/catalog-grid.tsx

@@ -217,7 +217,8 @@ export function CatalogGrid({
                 'relative rounded-xl text-left outline-none transition-opacity',
                 'focus-visible:ring-3 focus-visible:ring-ring/50',
                 owned && 'cursor-not-allowed opacity-50',
-                isSelected && '[&>div]:border-primary [&>div]:ring-2 [&>div]:ring-primary/40',
+                isSelected &&
+                  '[&_.brick]:outline-3 [&_.brick]:outline-offset-2 [&_.brick]:outline-primary',
               )}
             >
               <SetCardContent set={item} />

src/components/katalog/set-card.tsx

@@ -1,6 +1,8 @@
 import Link from 'next/link';
-import { Check, Gift, ImageOff } from 'lucide-react';
+import { Check, Gift } from 'lucide-react';
 import { cn } from 'cn';
+import { SetPlaceholder } from '@/components/brick/set-placeholder';
+import { Studs } from '@/components/brick/studs';
 import type { CatalogRow } from '@/lib/queries/catalog';
 import { formatEuro } from '@/lib/money';
 import { setImageSrc } from '@/lib/images';
@@ -17,8 +19,10 @@ export function SetCardContent({ set }: { set: CatalogRow }) {
   const owned = set.ownedCopies > 0;
 
   return (
-    <div className="flex h-full flex-col overflow-hidden rounded-xl border border-border bg-card transition-colors">
+    <div className="relative h-full">
-      <div className="relative aspect-square bg-muted">
+      <Studs count={3} />
+      <div className="brick flex h-full flex-col overflow-hidden rounded-xl bg-card transition-colors">
+        <div className="relative aspect-square border-b-[length:var(--edge-w)] border-edge bg-muted">
           {image ? (
             // Plain img: images are either local files or a URL the user entered,
             // and the optimizer must never fetch arbitrary remote hosts.
@@ -31,20 +35,18 @@ export function SetCardContent({ set }: { set: CatalogRow }) {
               className="size-full object-contain p-2"
             />
           ) : (
-          <div className="flex size-full items-center justify-center text-muted-foreground">
+            <SetPlaceholder setNumber={set.setNumber} manufacturerName={set.manufacturerName} />
-            <ImageOff className="size-8" aria-hidden />
-          </div>
           )}
 
           <div className="absolute top-2 left-2 flex flex-col items-start gap-1">
             {owned ? (
-            <Badge className="gap-1 bg-emerald-600 text-white hover:bg-emerald-600">
+              <Badge className="gap-1 bg-owned text-owned-foreground">
                 <Check className="size-3" aria-hidden />
                 {set.ownedCopies > 1 ? `${set.ownedCopies}× vorhanden` : 'Vorhanden'}
               </Badge>
             ) : null}
             {set.wishlistCount > 0 ? (
-            <Badge variant="secondary" className="gap-1">
+              <Badge className="gap-1">
                 <Gift className="size-3" aria-hidden />
                 Auf Wunschliste
               </Badge>
@@ -61,7 +63,9 @@ export function SetCardContent({ set }: { set: CatalogRow }) {
           </div>
           <p className="line-clamp-2 text-sm leading-snug font-medium">{set.name}</p>
           <div className="mt-auto flex items-center justify-between gap-2 pt-1 text-xs text-muted-foreground">
-          <span className="truncate">{[set.themeName, set.year].filter(Boolean).join(' · ')}</span>
+            <span className="truncate">
+              {[set.themeName, set.year].filter(Boolean).join(' · ')}
+            </span>
             {set.retailPriceCents !== null ? (
               <span className="shrink-0 font-medium text-foreground">
                 {formatEuro(set.retailPriceCents)}
@@ -70,6 +74,7 @@ export function SetCardContent({ set }: { set: CatalogRow }) {
           </div>
         </div>
       </div>
+    </div>
   );
 }
 
@@ -78,7 +83,7 @@ export function SetCard({ set, className }: { set: CatalogRow; className?: strin
     <Link
       href={`/katalog/${set.id}`}
       className={cn(
-        'rounded-xl outline-none focus-visible:ring-3 focus-visible:ring-ring/50 [&>div]:hover:border-primary/40',
+        'rounded-xl outline-none focus-visible:ring-3 focus-visible:ring-ring/50',
         className,
       )}
     >

src/components/konto/design-picker.tsx

@@ -0,0 +1,88 @@
+'use client';
+
+import { useRouter } from 'next/navigation';
+import { useState, useTransition } from 'react';
+import { Check } from 'lucide-react';
+import { toast } from 'sonner';
+import { cn } from 'cn';
+import { setDesignAction } from '@/app/(app)/konto/actions';
+import { DESIGN_INFO, DESIGNS, type Design } from '@/lib/design';
+
+/** Switches the look right away and stores it in the cookie in the background. */
+function applyDesign(design: Design) {
+  const root = document.documentElement;
+  root.dataset.design = design;
+  root.classList.toggle('dark', DESIGN_INFO[design].dark);
+}
+
+export function DesignPicker({ current }: { current: Design }) {
+  const router = useRouter();
+  const [selected, setSelected] = useState<Design>(current);
+  const [, startTransition] = useTransition();
+
+  function choose(design: Design) {
+    const previous = selected;
+    setSelected(design);
+    applyDesign(design);
+
+    startTransition(async () => {
+      const result = await setDesignAction({ design });
+      if (!result.ok) {
+        setSelected(previous);
+        applyDesign(previous);
+        toast.error(result.error);
+        return;
+      }
+      router.refresh();
+    });
+  }
+
+  return (
+    <fieldset>
+      <legend className="sr-only">Design</legend>
+      <div className="grid gap-3 sm:grid-cols-2">
+        {DESIGNS.map((design) => {
+          const info = DESIGN_INFO[design];
+          const active = design === selected;
+          return (
+            <label
+              key={design}
+              className={cn(
+                'relative flex cursor-pointer items-center gap-3 rounded-lg border-[length:max(1px,var(--edge-w))] p-3 transition-colors',
+                'has-focus-visible:ring-3 has-focus-visible:ring-ring/50',
+                active ? 'border-primary bg-accent' : 'border-border hover:bg-muted/60',
+              )}
+            >
+              <input
+                type="radio"
+                name="design"
+                value={design}
+                checked={active}
+                onChange={() => choose(design)}
+                className="sr-only"
+              />
+              <span
+                aria-hidden
+                className="grid size-12 shrink-0 grid-cols-2 overflow-hidden rounded-md border border-black/15"
+              >
+                {info.swatch.map((color, index) => (
+                  <span key={index} style={{ backgroundColor: color }} />
+                ))}
+              </span>
+              <span className="min-w-0 flex-1">
+                <span className="block text-sm font-semibold">
+                  {info.label}
+                  {design === 'klemmbaustein' ? (
+                    <span className="font-normal text-muted-foreground"> · Standard</span>
+                  ) : null}
+                </span>
+                <span className="block text-xs text-muted-foreground">{info.description}</span>
+              </span>
+              {active ? <Check className="size-5 shrink-0 text-primary" aria-hidden /> : null}
+            </label>
+          );
+        })}
+      </div>
+    </fieldset>
+  );
+}

src/components/layout/app-header.tsx

@@ -1,5 +1,5 @@
 import Link from 'next/link';
-import { Blocks } from 'lucide-react';
+import { BrickLogo } from '@/components/brick/logo';
 import { DesktopNav } from './bottom-nav';
 import { UserMenu } from './user-menu';
 import type { SessionUser } from '@/lib/session';
@@ -8,8 +8,11 @@ export function AppHeader({ user }: { user: SessionUser }) {
   return (
     <header className="sticky top-0 z-40 border-b border-border bg-background/95 backdrop-blur">
       <div className="mx-auto flex h-14 max-w-5xl items-center gap-3 px-4">
-        <Link href="/" className="flex items-center gap-2 font-semibold tracking-tight">
+        <Link
-          <Blocks className="size-5 text-primary" aria-hidden />
+          href="/"
+          className="flex items-center gap-2 text-lg font-bold tracking-tight [font-family:var(--font-display)]"
+        >
+          <BrickLogo className="h-6 w-7" />
           <span>Bricktrack</span>
         </Link>
         <div className="flex-1" />

src/components/layout/bottom-nav.tsx

@@ -18,7 +18,7 @@ export function BottomNav() {
   return (
     <nav
       aria-label="Hauptnavigation"
-      className="fixed inset-x-0 bottom-0 z-40 border-t border-border bg-background/95 pb-[env(safe-area-inset-bottom)] backdrop-blur md:hidden"
+      className="fixed inset-x-0 bottom-0 z-40 border-t-[length:max(1px,var(--edge-w))] border-border bg-card/95 pb-[env(safe-area-inset-bottom)] backdrop-blur md:hidden"
     >
       <ul className="mx-auto flex max-w-lg">
         {items.map((item) => {
@@ -30,10 +30,22 @@ export function BottomNav() {
                 aria-current={active ? 'page' : undefined}
                 className={cn(
                   'flex h-16 flex-col items-center justify-center gap-1 text-xs transition-colors',
-                  active ? 'text-primary' : 'text-muted-foreground hover:text-foreground',
+                  active
+                    ? 'font-bold text-foreground'
+                    : 'font-medium text-muted-foreground hover:text-foreground',
+                )}
+              >
+                {/* The active tab sits on a small plate, like a tile on a baseplate. */}
+                <span
+                  className={cn(
+                    'flex h-7 w-12 items-center justify-center rounded-[calc(var(--radius)*0.6)] border-[length:var(--edge-w)]',
+                    active
+                      ? 'border-edge bg-secondary text-secondary-foreground'
+                      : 'border-transparent',
                   )}
                 >
                   <item.icon className="size-5" aria-hidden />
+                </span>
                 {item.label}
               </Link>
             </li>
@@ -59,7 +71,7 @@ export function DesktopNav() {
             className={cn(
               'flex h-10 items-center gap-2 rounded-lg px-3 text-sm font-medium transition-colors',
               active
-                ? 'bg-muted text-foreground'
+                ? 'border-[length:var(--edge-w)] border-edge bg-secondary text-secondary-foreground'
                 : 'text-muted-foreground hover:bg-muted/60 hover:text-foreground',
             )}
           >

src/components/wunschlisten/public-wishlist.tsx

@@ -1,10 +1,12 @@
 'use client';
 
 import { useEffect, useState, useTransition } from 'react';
-import { Check, ExternalLink, Gift, ImageOff, Loader2, Undo2 } from 'lucide-react';
+import { Check, ExternalLink, Gift, Loader2, Undo2 } from 'lucide-react';
 import { toast } from 'sonner';
 import { cancelReservation, reserveItem } from '@/app/w/actions';
 import { setImageSrc } from '@/lib/images';
+import { SetPlaceholder } from '@/components/brick/set-placeholder';
+import { Studs } from '@/components/brick/studs';
 import { formatEuro } from '@/lib/money';
 import { priorityLabel } from '@/lib/wishlist-logic';
 import { Badge } from '@/components/ui/badge';
@@ -125,24 +127,25 @@ export function PublicWishlist({
   }
 
   return (
-    <div className="space-y-3">
+    <div className="space-y-5 pt-2">
       {items.map((item) => {
         const image = setImageSrc(item);
         const mine = Boolean(tokens[item.id]);
 
         return (
-          <article
+          <article key={item.id} className="relative">
-            key={item.id}
+            {/* Studs turn green once someone has taken the wish. */}
-            className="flex gap-3 rounded-xl border border-border bg-card p-3"
+            <Studs count={3} studClassName={mine || item.isReserved ? 'bg-owned' : undefined} />
-          >
+            <div className="brick flex gap-3 rounded-xl bg-card p-3">
-            <div className="size-20 shrink-0 overflow-hidden rounded-lg border border-border bg-muted sm:size-28">
+              <div className="size-20 shrink-0 overflow-hidden rounded-lg border-[length:max(1px,var(--edge-w))] border-edge bg-muted sm:size-28">
                 {image ? (
                   // eslint-disable-next-line @next/next/no-img-element
                   <img src={image} alt="" loading="lazy" className="size-full object-contain" />
                 ) : (
-                <div className="flex size-full items-center justify-center text-muted-foreground">
+                  <SetPlaceholder
-                  <ImageOff className="size-6" aria-hidden />
+                    setNumber={item.setNumber}
-                </div>
+                    manufacturerName={item.manufacturerName}
+                  />
                 )}
               </div>
 
@@ -172,7 +175,7 @@ export function PublicWishlist({
                 <div className="flex flex-wrap items-center gap-2">
                   {mine ? (
                     <>
-                    <Badge className="gap-1 bg-emerald-600 text-white hover:bg-emerald-600">
+                      <Badge className="gap-1 bg-owned text-owned-foreground">
                         <Check className="size-3" aria-hidden />
                         Das schenkst du
                       </Badge>
@@ -211,6 +214,7 @@ export function PublicWishlist({
                   ) : null}
                 </div>
               </div>
+            </div>
           </article>
         );
       })}

src/components/wunschlisten/wishlist-items.tsx

@@ -3,7 +3,8 @@
 import Link from 'next/link';
 import { useRouter } from 'next/navigation';
 import { useState, useTransition } from 'react';
-import { ArrowDown, ArrowUp, Check, ImageOff, Loader2, Trash2 } from 'lucide-react';
+import { ArrowDown, ArrowUp, Check, Loader2, Trash2 } from 'lucide-react';
+import { SetPlaceholder } from '@/components/brick/set-placeholder';
 import { toast } from 'sonner';
 import {
   removeWishlistItem,
@@ -122,15 +123,17 @@ export function WishlistItems({
 
             <Link
               href={`/katalog/${item.setId}`}
-              className="size-16 shrink-0 overflow-hidden rounded-lg border border-border bg-muted"
+              className="size-16 shrink-0 overflow-hidden rounded-lg border-[length:max(1px,var(--edge-w))] border-edge bg-muted"
             >
               {image ? (
                 // eslint-disable-next-line @next/next/no-img-element
                 <img src={image} alt="" loading="lazy" className="size-full object-contain" />
               ) : (
-                <div className="flex size-full items-center justify-center text-muted-foreground">
+                <SetPlaceholder
-                  <ImageOff className="size-5" aria-hidden />
+                  setNumber={item.setNumber}
-                </div>
+                  manufacturerName={item.manufacturerName}
+                  size="sm"
+                />
               )}
             </Link>
 

src/lib/brick-row.ts

@@ -0,0 +1,48 @@
+/**
+ * The progress row on the dashboard: a fixed number of slots, filled with one
+ * brick per share of the catalog that is already in the collection. Each
+ * brick takes the colour of a collector, in proportion to what they own.
+ */
+
+export type BrickShare = { key: string; count: number };
+
+/**
+ * Returns `slots` entries: a collector key for a filled slot, `null` for an
+ * empty one. Filled slots come first, grouped by collector in input order.
+ */
+export function brickRow(
+  ownedSets: number,
+  totalSets: number,
+  shares: BrickShare[],
+  slots = 10,
+): Array<string | null> {
+  const empty = Array<string | null>(slots).fill(null);
+  if (totalSets <= 0 || ownedSets <= 0) return empty;
+
+  // Never round a non-empty collection down to an empty row, and only show a
+  // full row when everything is really there.
+  const ratio = Math.min(ownedSets, totalSets) / totalSets;
+  let filled = Math.round(ratio * slots);
+  filled = Math.max(1, filled);
+  if (ratio < 1) filled = Math.min(filled, slots - 1);
+
+  const positive = shares.filter((share) => share.count > 0);
+  const shareTotal = positive.reduce((sum, share) => sum + share.count, 0);
+  if (shareTotal === 0) return [...Array<string | null>(filled).fill(''), ...empty].slice(0, slots);
+
+  // Largest remainder: floor first, then hand out the rest by biggest fraction.
+  const exact = positive.map((share) => (share.count / shareTotal) * filled);
+  const counts = exact.map(Math.floor);
+  let rest = filled - counts.reduce((sum, value) => sum + value, 0);
+  const order = exact
+    .map((value, index) => ({ index, fraction: value - Math.floor(value) }))
+    .sort((a, b) => b.fraction - a.fraction || a.index - b.index);
+  for (const { index } of order) {
+    if (rest === 0) break;
+    counts[index]! += 1;
+    rest -= 1;
+  }
+
+  const row = positive.flatMap((share, index) => Array<string>(counts[index]!).fill(share.key));
+  return [...row, ...empty].slice(0, slots);
+}

src/lib/design.ts

@@ -0,0 +1,110 @@
+/**
+ * The selectable looks of the app.
+ *
+ * A design is nothing but a set of CSS tokens under `[data-design=...]` in
+ * `src/app/designs.css`; this module only knows the names. The choice lives in
+ * a cookie, so it is per device and also applies to pages without a session
+ * (login, public wishlist).
+ */
+
+export const DESIGNS = ['klemmbaustein', 'warm', 'nacht', 'bonbon', 'bauklotz', 'schlicht'] as const;
+
+export type Design = (typeof DESIGNS)[number];
+
+export const DEFAULT_DESIGN: Design = 'klemmbaustein';
+
+export const DESIGN_COOKIE = 'bricktrack-design';
+
+export type DesignInfo = {
+  label: string;
+  description: string;
+  /** Dark designs also set the `.dark` class so `dark:` variants apply. */
+  dark: boolean;
+  /** Browser chrome colour (address bar, PWA title bar). */
+  themeColor: string;
+  /** Four colours for the preview swatch on the account page. */
+  swatch: [string, string, string, string];
+};
+
+export const DESIGN_INFO: Record<Design, DesignInfo> = {
+  klemmbaustein: {
+    label: 'Klemmbaustein',
+    description: 'Noppen, Konturen und kräftige Steinfarben.',
+    dark: false,
+    themeColor: '#fff6e5',
+    swatch: ['#fff6e5', '#d63a30', '#ffc93c', '#2f6bea'],
+  },
+  warm: {
+    label: 'Warm',
+    description: 'Ruhiger Sandton mit Ziegelrot.',
+    dark: false,
+    themeColor: '#f6f3ec',
+    swatch: ['#f6f3ec', '#c8381f', '#fbe3a6', '#1d1b17'],
+  },
+  nacht: {
+    label: 'Nachtblau',
+    description: 'Dunkel mit gelbem Akzent, schont abends die Augen.',
+    dark: true,
+    themeColor: '#0e1422',
+    swatch: ['#0e1422', '#ffc93c', '#182136', '#60a5fa'],
+  },
+  bonbon: {
+    label: 'Bonbon',
+    description: 'Weiches Lila mit Pastellfarben.',
+    dark: false,
+    themeColor: '#f4f0ff',
+    swatch: ['#f4f0ff', '#6d4aff', '#d3f5e7', '#ffe1d1'],
+  },
+  bauklotz: {
+    label: 'Bauklotz',
+    description: 'Primärfarben und dicke schwarze Konturen.',
+    dark: false,
+    themeColor: '#ffd500',
+    swatch: ['#fffbef', '#1e5eff', '#ffd500', '#e63b2e'],
+  },
+  schlicht: {
+    label: 'Schlicht',
+    description: 'Neutrales Grau, wie bis Version 0.3.',
+    dark: false,
+    themeColor: '#ffffff',
+    swatch: ['#ffffff', '#171717', '#f5f5f5', '#a3a3a3'],
+  },
+};
+
+export function isDesign(value: unknown): value is Design {
+  return typeof value === 'string' && (DESIGNS as readonly string[]).includes(value);
+}
+
+/** Cookie value to design; anything unknown falls back to the default. */
+export function resolveDesign(value: string | null | undefined): Design {
+  return isDesign(value) ? value : DEFAULT_DESIGN;
+}
+
+/** Number of placeholder tones every design defines (`--tone-1` ...). */
+export const TONE_COUNT = 5;
+
+/** The manufacturers named in the brief get a fixed, recognisable tone. */
+const KNOWN_TONES: Record<string, number> = {
+  lego: 1,
+  playmobil: 2,
+  cobi: 3,
+  bluebrixx: 4,
+  megabloks: 5,
+};
+
+/**
+ * Stable tone for a set without an image, derived from its manufacturer, so
+ * all Lego placeholders share a colour and Playmobil gets another one.
+ * Returns 1 ... TONE_COUNT.
+ */
+export function toneIndex(manufacturerName: string): number {
+  const key = manufacturerName.toLowerCase().replace(/[^a-z0-9]/g, '');
+  const known = KNOWN_TONES[key];
+  if (known) return known;
+
+  let hash = 0;
+  for (const char of key) {
+    hash = (hash * 31 + char.codePointAt(0)!) >>> 0;
+  }
+  return (hash % TONE_COUNT) + 1;
+}

tests/unit/design.test.ts

@@ -0,0 +1,80 @@
+import { describe, expect, it } from 'vitest';
+import { brickRow } from '@/lib/brick-row';
+import { DEFAULT_DESIGN, DESIGNS, DESIGN_INFO, resolveDesign, TONE_COUNT, toneIndex } from '@/lib/design';
+
+describe('Design aus dem Cookie', () => {
+  it('nimmt ein bekanntes Design', () => {
+    expect(resolveDesign('nacht')).toBe('nacht');
+    expect(resolveDesign('schlicht')).toBe('schlicht');
+  });
+
+  it('faellt bei Unbekanntem auf Klemmbaustein zurueck', () => {
+    expect(DEFAULT_DESIGN).toBe('klemmbaustein');
+    expect(resolveDesign(undefined)).toBe('klemmbaustein');
+    expect(resolveDesign('')).toBe('klemmbaustein');
+    expect(resolveDesign('"><script>')).toBe('klemmbaustein');
+  });
+
+  it('beschreibt jedes Design', () => {
+    for (const design of DESIGNS) {
+      expect(DESIGN_INFO[design].label.length).toBeGreaterThan(0);
+      expect(DESIGN_INFO[design].themeColor).toMatch(/^#[0-9a-f]{6}$/);
+    }
+    expect(DESIGNS.filter((design) => DESIGN_INFO[design].dark)).toEqual(['nacht']);
+  });
+});
+
+describe('Farbton fuer Sets ohne Bild', () => {
+  it('gibt den bekannten Herstellern feste, verschiedene Toene', () => {
+    const tones = ['Lego', 'Playmobil', 'Cobi', 'BlueBrixx', 'Mega Bloks'].map(toneIndex);
+    expect(new Set(tones).size).toBe(5);
+    expect(toneIndex('Lego')).toBe(1);
+    expect(toneIndex('LEGO')).toBe(1);
+  });
+
+  it('bleibt fuer andere Hersteller stabil und im Bereich', () => {
+    expect(toneIndex('Sluban')).toBe(toneIndex('Sluban'));
+    for (const name of ['Sluban', 'Qman', 'Wange', '', 'Ölfabrik']) {
+      const tone = toneIndex(name);
+      expect(tone).toBeGreaterThanOrEqual(1);
+      expect(tone).toBeLessThanOrEqual(TONE_COUNT);
+    }
+  });
+});
+
+describe('Steinreihe auf der Startseite', () => {
+  it('ist leer ohne Katalog oder ohne Sammlung', () => {
+    expect(brickRow(0, 10, [])).toEqual(Array(10).fill(null));
+    expect(brickRow(3, 0, [])).toEqual(Array(10).fill(null));
+  });
+
+  it('verteilt die Steine nach Anteil auf die Sammler', () => {
+    const row = brickRow(4, 10, [
+      { key: 'max', count: 2 },
+      { key: 'mia', count: 2 },
+    ]);
+    expect(row).toEqual(['max', 'max', 'mia', 'mia', null, null, null, null, null, null]);
+  });
+
+  it('zeigt mindestens einen Stein, aber nie eine volle Reihe vor dem Ziel', () => {
+    expect(brickRow(1, 500, [{ key: 'max', count: 1 }]).filter(Boolean)).toHaveLength(1);
+    expect(brickRow(499, 500, [{ key: 'max', count: 499 }]).filter(Boolean)).toHaveLength(9);
+    expect(brickRow(500, 500, [{ key: 'max', count: 500 }]).filter(Boolean)).toHaveLength(10);
+  });
+
+  it('vergibt Reststeine nach dem groessten Bruchteil', () => {
+    const row = brickRow(10, 20, [
+      { key: 'a', count: 1 },
+      { key: 'b', count: 1 },
+      { key: 'c', count: 1 },
+    ]);
+    // 5 Steine auf drei gleiche Anteile: 2, 2, 1 - die vorderen zuerst.
+    expect(row.filter((key) => key === 'a')).toHaveLength(2);
+    expect(row.filter((key) => key === 'b')).toHaveLength(2);
+    expect(row.filter((key) => key === 'c')).toHaveLength(1);
+  });
+
+  it('fuellt ohne Sammler-Zuordnung neutral', () => {
+    expect(brickRow(5, 10, []).slice(0, 5)).toEqual(['', '', '', '', '']);
+  });
+});