feat(backend): bootstrap NestJS app with dummy auth and health endpoint

Refs #3

Backend architecture for OnlyPets was finalized and hardened.

[Text wie oben]

.gitignore

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+# Node.js
+node_modules/
+npm-debug.log
+
+# Environment Dateien (Geheimnisse!)
+.env
+.env.local
+
+# Build-Ausgaben
+dist/
+build/
+.next/
+
+# Betriebssystem
+.DS_Store
+Thumbs.db
+
+# Docker
+docker-data/

backend/package.json

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+{
+  "name": "onlypets-backend",
+  "version": "1.0.0",
+  "scripts": {
+    "dev": "ts-node src/main.ts",
+    "start": "node dist/main.js",
+    "build": "tsc",
+    "seed": "ts-node prisma/seed.ts"
+  },
+  "dependencies": {
+    "@nestjs/core": "11.1.10",
+    "@nestjs/platform-express": "^11.1.10",
+    "@prisma/client": "^6.19.1",
+    "express": "^4.17.1",
+    "prisma": "^6.19.1",
+    "ts-node": "^10.9.2",
+    "typescript": "^5.9.3"
+  },
+  "devDependencies": {
+    "@types/express": "^5.0.6",
+    "nodemon": "^3.1.11"
+  }
+}

backend/prisma.config.ts

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+import { defineConfig } from 'prisma/config';
+
+export default defineConfig({
+  datasource: {
+    url: process.env.DATABASE_URL!,
+  },
+  migrations: {
+    seed: 'ts-node ./prisma/seed.ts',
+  },
+});

backend/prisma/migrations/20251226103251_init/migration.sql

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+-- CreateTable
+CREATE TABLE "User" (
+    "id" SERIAL NOT NULL,
+    "name" TEXT NOT NULL,
+    "email" TEXT NOT NULL,
+    "createdAt" TIMESTAMP(3) NOT NULL DEFAULT CURRENT_TIMESTAMP,
+
+    CONSTRAINT "User_pkey" PRIMARY KEY ("id")
+);
+
+-- CreateTable
+CREATE TABLE "Pet" (
+    "id" SERIAL NOT NULL,
+    "name" TEXT NOT NULL,
+    "type" TEXT NOT NULL,
+    "breed" TEXT NOT NULL,
+    "birthDate" TIMESTAMP(3),
+    "gender" TEXT,
+    "bio" TEXT,
+    "avatarUrl" TEXT,
+    "visibility" TEXT NOT NULL DEFAULT 'public',
+    "ownerId" INTEGER NOT NULL,
+
+    CONSTRAINT "Pet_pkey" PRIMARY KEY ("id")
+);
+
+-- CreateTable
+CREATE TABLE "Post" (
+    "id" SERIAL NOT NULL,
+    "content" TEXT,
+    "createdAt" TIMESTAMP(3) NOT NULL DEFAULT CURRENT_TIMESTAMP,
+    "petId" INTEGER NOT NULL,
+    "authorId" INTEGER NOT NULL,
+
+    CONSTRAINT "Post_pkey" PRIMARY KEY ("id")
+);
+
+-- CreateTable
+CREATE TABLE "Follow" (
+    "id" SERIAL NOT NULL,
+    "followerId" INTEGER NOT NULL,
+    "followingId" INTEGER NOT NULL,
+    "createdAt" TIMESTAMP(3) NOT NULL DEFAULT CURRENT_TIMESTAMP,
+
+    CONSTRAINT "Follow_pkey" PRIMARY KEY ("id")
+);
+
+-- CreateTable
+CREATE TABLE "Notification" (
+    "id" SERIAL NOT NULL,
+    "type" TEXT NOT NULL,
+    "payload" JSONB NOT NULL,
+    "read" BOOLEAN NOT NULL DEFAULT false,
+    "userId" INTEGER NOT NULL,
+    "createdAt" TIMESTAMP(3) NOT NULL DEFAULT CURRENT_TIMESTAMP,
+
+    CONSTRAINT "Notification_pkey" PRIMARY KEY ("id")
+);
+
+-- CreateIndex
+CREATE UNIQUE INDEX "User_email_key" ON "User"("email");
+
+-- CreateIndex
+CREATE UNIQUE INDEX "Follow_followerId_followingId_key" ON "Follow"("followerId", "followingId");
+
+-- AddForeignKey
+ALTER TABLE "Pet" ADD CONSTRAINT "Pet_ownerId_fkey" FOREIGN KEY ("ownerId") REFERENCES "User"("id") ON DELETE CASCADE ON UPDATE CASCADE;
+
+-- AddForeignKey
+ALTER TABLE "Post" ADD CONSTRAINT "Post_petId_fkey" FOREIGN KEY ("petId") REFERENCES "Pet"("id") ON DELETE CASCADE ON UPDATE CASCADE;
+
+-- AddForeignKey
+ALTER TABLE "Post" ADD CONSTRAINT "Post_authorId_fkey" FOREIGN KEY ("authorId") REFERENCES "User"("id") ON DELETE CASCADE ON UPDATE CASCADE;
+
+-- AddForeignKey
+ALTER TABLE "Follow" ADD CONSTRAINT "Follow_followerId_fkey" FOREIGN KEY ("followerId") REFERENCES "User"("id") ON DELETE CASCADE ON UPDATE CASCADE;
+
+-- AddForeignKey
+ALTER TABLE "Follow" ADD CONSTRAINT "Follow_followingId_fkey" FOREIGN KEY ("followingId") REFERENCES "User"("id") ON DELETE CASCADE ON UPDATE CASCADE;
+
+-- AddForeignKey
+ALTER TABLE "Notification" ADD CONSTRAINT "Notification_userId_fkey" FOREIGN KEY ("userId") REFERENCES "User"("id") ON DELETE CASCADE ON UPDATE CASCADE;

backend/prisma/migrations/migration_lock.toml

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+# Please do not edit this file manually
+# It should be added in your version-control system (e.g., Git)
+provider = "postgresql"

backend/prisma/prisma.config.ts

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+import { defineConfig } from 'prisma/config';
+
+export default defineConfig({
+  datasource: {
+    url: process.env.DATABASE_URL!,
+  },
+  migrations: {
+    seed: 'ts-node ./prisma/seed.ts',
+  },
+});

backend/prisma/prisma.service.ts

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+import { Injectable, OnModuleInit, OnModuleDestroy } from '@nestjs/common';
+import { PrismaClient } from '@prisma/client';
+
+@Injectable()
+export class PrismaService
+  extends PrismaClient
+  implements OnModuleInit, OnModuleDestroy
+{
+  async onModuleInit() {
+    await this.$connect();
+  }
+
+  async onModuleDestroy() {
+    await this.$disconnect();
+  }
+}

backend/prisma/schema.prisma

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+generator client {
+  provider = "prisma-client-js"
+}
+
+datasource db {
+  provider = "postgresql"
+  url      = env("DATABASE_URL")
+}
+
+
+model User {
+  id    Int    @id @default(autoincrement())
+  name  String
+  email String @unique
+
+  pets  Pet[]
+  posts Post[]
+
+  following Follow[] @relation("Follower")
+  followers Follow[] @relation("Following")
+
+  createdAt DateTime @default(now())
+
+  notifications Notification[]
+}
+
+
+model Pet {
+  id         Int      @id @default(autoincrement())
+  name       String
+  type       String        // "Hund" | "Katze"
+  breed      String
+  birthDate  DateTime?     // ⭐ Single Source of Truth für Alter
+  gender     String?
+  bio        String?
+  avatarUrl  String?
+  visibility String        @default("public") // public | followers
+
+  ownerId Int
+  owner   User @relation(fields: [ownerId], references: [id], onDelete: Cascade)
+
+  posts Post[]
+}
+
+model Post {
+  id        Int      @id @default(autoincrement())
+  content   String?
+  createdAt DateTime @default(now())
+
+  petId Int
+  pet   Pet @relation(fields: [petId], references: [id], onDelete: Cascade)
+
+  authorId Int
+  author   User @relation(fields: [authorId], references: [id], onDelete: Cascade)
+}
+model Follow {
+  id Int @id @default(autoincrement())
+
+  followerId Int
+  follower   User @relation("Follower", fields: [followerId], references: [id], onDelete: Cascade)
+
+  followingId Int
+  following   User @relation("Following", fields: [followingId], references: [id], onDelete: Cascade)
+
+  createdAt DateTime @default(now())
+
+  @@unique([followerId, followingId])
+}
+model Notification {
+  id        Int      @id @default(autoincrement())
+  type      String   // 'FOLLOW' | 'BIRTHDAY'
+  payload   Json
+  read      Boolean  @default(false)
+
+  userId Int
+  user   User @relation(fields: [userId], references: [id], onDelete: Cascade)
+
+  createdAt DateTime @default(now())
+}

backend/prisma/seed.ts

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+import { PrismaClient } from '@prisma/client';
+
+const prisma = new PrismaClient();
+
+async function main() {
+  console.log('DATABASE_URL:', process.env.DATABASE_URL);
+
+  /**
+   * 1. USERS (ohne Passwort – Auth kommt später)
+   */
+  const users = await Promise.all([
+  prisma.user.upsert({
+    where: { email: 'alice@onlypets.dev' },
+    update: {},
+    create: {
+      email: 'alice@onlypets.dev',
+      name: 'Alice',
+    },
+  }),
+  prisma.user.upsert({
+    where: { email: 'bob@onlypets.dev' },
+    update: {},
+    create: {
+      email: 'bob@onlypets.dev',
+      name: 'Bob',
+    },
+  }),
+  prisma.user.upsert({
+    where: { email: 'carla@onlypets.dev' },
+    update: {},
+    create: {
+      email: 'carla@onlypets.dev',
+      name: 'Carla',
+    },
+  }),
+]);
+
+
+  /**
+   * 2. PETS
+   */
+  const pets = await Promise.all([
+  prisma.pet.create({
+    data: {
+      name: 'Milo',
+      type: 'Katze',
+      breed: 'EKH',
+      birthDate: new Date('2020-05-12'),
+      ownerId: users[0].id,
+      visibility: 'public',
+    },
+  }),
+  prisma.pet.create({
+    data: {
+      name: 'Luna',
+      type: 'Hund',
+      breed: 'Labrador',
+      birthDate: new Date('2019-11-03'),
+      ownerId: users[1].id,
+      visibility: 'followers',
+    },
+  }),
+  prisma.pet.create({
+    data: {
+      name: 'Oscar',
+      type: 'Katze',
+      breed: 'BKH',
+      birthDate: new Date('2022-02-01'),
+      ownerId: users[2].id,
+      visibility: 'public',
+    },
+  }),
+]);
+
+
+  /**
+   * 3. POSTS
+   */
+  await Promise.all([
+    prisma.post.create({
+      data: {
+        content: 'Milo liebt die Sonne ☀️',
+        authorId: users[0].id,
+        petId: pets[0].id,
+      },
+    }),
+    prisma.post.create({
+      data: {
+        content: 'Luna beim Spaziergang 🐕',
+        authorId: users[1].id,
+        petId: pets[1].id,
+      },
+    }),
+    prisma.post.create({
+      data: {
+        content: 'Oscar schläft schon wieder 😴',
+        authorId: users[2].id,
+        petId: pets[2].id,
+      },
+    }),
+  ]);
+
+  /**
+   * 4. FOLLOWS
+   */
+  await Promise.all([
+    prisma.follow.create({
+      data: {
+        followerId: users[0].id,
+        followingId: users[1].id,
+      },
+    }),
+    prisma.follow.create({
+      data: {
+        followerId: users[0].id,
+        followingId: users[2].id,
+      },
+    }),
+    prisma.follow.create({
+      data: {
+        followerId: users[1].id,
+        followingId: users[2].id,
+      },
+    }),
+  ]);
+
+  console.log('✅ Seed erfolgreich ausgeführt');
+}
+
+main()
+  .catch((e) => {
+    console.error('❌ Seed fehlgeschlagen:', e);
+    process.exit(1);
+  })
+  .finally(async () => {
+    await prisma.$disconnect();
+  });

backend/src/app.module.ts

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+import { Module } from '@nestjs/common';
+import { APP_GUARD } from '@nestjs/core';
+
+import { DummyAuthGuard } from './auth/guards/dummy-auth.guard';
+import { HealthController } from './health.controller';
+
+@Module({
+  imports: [],
+  controllers: [HealthController],
+  providers: [
+    {
+      provide: APP_GUARD,
+      useClass: DummyAuthGuard,
+    },
+  ],
+})
+export class AppModule {}

backend/src/auth/README.md

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+# Auth (Backend)
+
+Dieses Verzeichnis enthält das **Auth-Fundament** für OnlyPets.
+
+## Architekturprinzipien
+
+- Guard-first-Ansatz
+- Keine Auth-Logik in Services
+- Controller entscheiden nur über @Public()
+- `req.user` ist immer definiert (FakeUser oder null)
+
+## Aktueller Status
+
+- DummyAuthGuard ist global aktiv
+- Fake-User für DEV via ENV steuerbar
+- Rollen vorbereitet: USER / ADMIN / MOD
+- Keine echte Auth (JWT/Password) implementiert
+
+## ENV (DEV)
+
+```env
+AUTH_MODE=dummy
+DEV_FAKE_USER_ID=1
+DEV_FAKE_USER_ROLE=ADMIN
+DEV_FAKE_USER=true

backend/src/auth/decorators/public.decorator.ts

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+import { SetMetadata } from '@nestjs/common';
+
+export const IS_PUBLIC_KEY = 'isPublic';
+
+export const Public = () => SetMetadata(IS_PUBLIC_KEY, true);

backend/src/auth/guards/dummy-auth.guard.ts

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+import { CanActivate, ExecutionContext, Injectable } from '@nestjs/common';
+import { Reflector } from '@nestjs/core';
+import { IS_PUBLIC_KEY } from '../decorators/public.decorator';
+import { RequestUser, UserRole } from '../types/request-user.type';
+
+@Injectable()
+export class DummyAuthGuard implements CanActivate {
+  constructor(private readonly reflector: Reflector) {}
+
+  canActivate(context: ExecutionContext): boolean {
+    const isPublic = this.reflector.getAllAndOverride<boolean>(
+      IS_PUBLIC_KEY,
+      [context.getHandler(), context.getClass()],
+    );
+
+    const request = context.switchToHttp().getRequest();
+
+    if (isPublic) {
+      request.user = null;
+      return true;
+    }
+
+    if (process.env.AUTH_MODE !== 'dummy') {
+      request.user = null;
+      return true;
+    }
+
+    const rawRole = process.env.DEV_FAKE_USER_ROLE;
+    const role: UserRole =
+      rawRole === 'ADMIN' || rawRole === 'MOD' || rawRole === 'USER'
+        ? rawRole
+        : 'USER';
+
+    const fakeUser: RequestUser = {
+      id: Number(process.env.DEV_FAKE_USER_ID ?? 0),
+      role,
+      isFake: process.env.DEV_FAKE_USER === 'true',
+    };
+
+    request.user = fakeUser;
+    return true;
+  }
+}

backend/src/auth/types/request-user.type.ts

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+export type UserRole = 'USER' | 'ADMIN' | 'MOD';
+
+export interface RequestUser {
+  /** User-ID aus DB oder Fake-User */
+  id: number;
+
+  /** Rollenbasis für Guards & Admin-Features */
+  role: UserRole;
+
+  /** Für DEV / Dummy-Auth */
+  isFake?: boolean;
+
+  /** Optional, future-proof (z. B. Feed-Optimierung) */
+  petIds?: number[];
+}

backend/src/follows/follows.controller.ts

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+import {
+  Controller,
+  Post,
+  Delete,
+  Param,
+  Req,
+  BadRequestException,
+} from '@nestjs/common';
+import { PrismaService } from '../prisma/prisma.service';
+
+@Controller('follows')
+export class FollowsController {
+  constructor(private readonly prisma: PrismaService) {}
+
+  @Post(':userId')
+  async follow(@Req() req, @Param('userId') userId: string) {
+    const followerId = req.user.id;
+    const followingId = Number(userId);
+
+    // ❌ Selbst-Follow verhindern
+    if (followerId === followingId) {
+      throw new BadRequestException({
+        error: 'VALIDATION_ERROR',
+        message: 'Du kannst dir nicht selbst folgen.',
+        field: 'userId',
+      });
+    }
+
+    try {
+      // 1️⃣ Follow erstellen
+      const follow = await this.prisma.follow.create({
+        data: {
+          followerId,
+          followingId,
+        },
+      });
+
+      // 2️⃣ Notification für den Gefolgten erzeugen
+      await this.prisma.notification.create({
+        data: {
+          type: 'FOLLOW',
+          userId: followingId,
+          payload: {
+            followerId,
+            followerName: req.user.name,
+          },
+        },
+      });
+
+      return follow;
+    } catch (err) {
+      // ❌ Bereits gefolgt (Unique-Constraint)
+      throw new BadRequestException({
+        error: 'ALREADY_FOLLOWING',
+        message: 'Du folgst diesem Nutzer bereits.',
+        field: 'userId',
+      });
+    }
+  }
+
+  @Delete(':userId')
+  async unfollow(@Req() req, @Param('userId') userId: string) {
+    return this.prisma.follow.delete({
+      where: {
+        followerId_followingId: {
+          followerId: req.user.id,
+          followingId: Number(userId),
+        },
+      },
+    });
+  }
+}

backend/src/health.controller.ts

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+import { Controller, Get } from '@nestjs/common';
+import { Public } from './auth/decorators/public.decorator';
+
+@Controller()
+export class HealthController {
+  @Public()
+  @Get('/health')
+  health() {
+    return {
+      status: 'ok',
+      timestamp: new Date().toISOString(),
+    };
+  }
+}

backend/src/main.ts

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+import { NestFactory } from '@nestjs/core';
+import { AppModule } from './app.module';
+
+async function bootstrap() {
+  const app = await NestFactory.create(AppModule);
+
+  const port = process.env.PORT || 3000;
+  await app.listen(port);
+
+  console.log(`🚀 Backend running on http://localhost:${port}`);
+}
+
+bootstrap();

backend/src/notifications/notifications.controller.ts

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+import { Controller, Get, Req } from '@nestjs/common';
+import { PrismaService } from '../prisma/prisma.service';
+
+@Controller('notifications')
+export class NotificationsController {
+  constructor(private readonly prisma: PrismaService) {}
+
+  @Get()
+  getMyNotifications(@Req() req) {
+    return this.prisma.notification.findMany({
+      where: { userId: req.user.id },
+      orderBy: { createdAt: 'desc' },
+      take: 20,
+    });
+  }
+}

backend/src/pets/dto/create-pet.dto.ts

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+export class CreatePetDto {
+  name: string;
+  type: 'Hund' | 'Katze';
+  breed: string;
+
+  // ENTWEDER:
+  birthDate?: string; // ISO
+
+  // ODER:
+  ageYears?: number;  // nur beim Erstellen erlaubt
+
+  gender?: string;
+  bio?: string;
+  avatarUrl?: string;
+  visibility?: 'public' | 'followers';
+}

backend/src/pets/dto/update-pet.dto.ts

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+export class UpdatePetDto {
+  birthDate?: string;   // ISO – einzige Altersquelle
+  bio?: string;
+  avatarUrl?: string;
+  visibility?: 'public' | 'followers';
+}

backend/src/pets/pets.controller.ts

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+import { Patch, Param, Body, Req } from '@nestjs/common';
+
+@Patch(':id')
+updatePet(
+  @Param('id') id: string,
+  @Body() dto: UpdatePetDto,
+  @Req() req,
+) {
+  return this.petsService.updatePet(
+    Number(id),
+    req.user.id,
+    dto,
+  );
+}

backend/src/pets/pets.service.ts

@@ -0,0 +1,119 @@
+import {
+  Injectable,
+  BadRequestException,
+  NotFoundException,
+} from '@nestjs/common';
+import { PrismaService } from '../prisma/prisma.service';
+import { CreatePetDto } from './dto/create-pet.dto';
+import { UpdatePetDto } from './dto/update-pet.dto';
+
+@Injectable()
+export class PetsService {
+  constructor(private readonly prisma: PrismaService) {}
+
+  // -------------------------------
+  // CREATE PET
+  // -------------------------------
+  async createPet(userId: number, dto: CreatePetDto) {
+    // ❌ Beides gleichzeitig verboten
+    if (dto.birthDate && dto.ageYears !== undefined) {
+      throw new BadRequestException({
+        error: 'VALIDATION_ERROR',
+        message: 'Entweder Geburtsdatum ODER Alter angeben, nicht beides.',
+        field: 'birthDate',
+      });
+    }
+
+    // ❌ Nichts angegeben verboten
+    if (!dto.birthDate && dto.ageYears === undefined) {
+      throw new BadRequestException({
+        error: 'VALIDATION_ERROR',
+        message: 'Geburtsdatum oder Alter muss angegeben werden.',
+        field: 'birthDate',
+      });
+    }
+
+    // ✅ BirthDate ableiten (Single Source of Truth)
+    let birthDate: Date | null = null;
+
+    if (dto.birthDate) {
+      birthDate = new Date(dto.birthDate);
+    }
+
+    if (dto.ageYears !== undefined) {
+      const today = new Date();
+      birthDate = new Date(
+        today.getFullYear() - dto.ageYears,
+        today.getMonth(),
+        today.getDate(),
+      );
+    }
+
+    // ❌ Zukunftsdatum verhindern
+    if (birthDate && birthDate > new Date()) {
+      throw new BadRequestException({
+        error: 'VALIDATION_ERROR',
+        message: 'Geburtsdatum darf nicht in der Zukunft liegen.',
+        field: 'birthDate',
+      });
+    }
+
+    return this.prisma.pet.create({
+      data: {
+        name: dto.name,
+        type: dto.type,
+        breed: dto.breed,
+        birthDate, // ⭐ WICHTIG: berechnetes Datum
+        gender: dto.gender,
+        bio: dto.bio,
+        avatarUrl: dto.avatarUrl,
+        visibility: dto.visibility ?? 'public',
+        ownerId: userId,
+      },
+    });
+  }
+
+  // -------------------------------
+  // UPDATE PET
+  // -------------------------------
+  async updatePet(
+    petId: number,
+    userId: number,
+    dto: UpdatePetDto,
+  ) {
+    const pet = await this.prisma.pet.findUnique({
+      where: { id: petId },
+    });
+
+    if (!pet || pet.ownerId !== userId) {
+      throw new NotFoundException({
+        error: 'NOT_FOUND',
+        message: 'Pet nicht gefunden.',
+      });
+    }
+
+    let birthDate = pet.birthDate;
+
+    if (dto.birthDate) {
+      birthDate = new Date(dto.birthDate);
+
+      if (birthDate > new Date()) {
+        throw new BadRequestException({
+          error: 'VALIDATION_ERROR',
+          message: 'Geburtsdatum darf nicht in der Zukunft liegen.',
+          field: 'birthDate',
+        });
+      }
+    }
+
+    return this.prisma.pet.update({
+      where: { id: petId },
+      data: {
+        birthDate,
+        bio: dto.bio,
+        avatarUrl: dto.avatarUrl,
+        visibility: dto.visibility,
+      },
+    });
+  }
+}

backend/src/posts/posts.controller.ts

@@ -0,0 +1,33 @@
+import { Controller, Get, Query, Req } from '@nestjs/common';
+import { PostsService } from './posts.service';
+
+@Controller('posts')
+export class PostsController {
+  constructor(private readonly postsService: PostsService) {}
+
+  @Get()
+  getFeed(
+    @Req() req,
+    @Query('take') take?: string,
+    @Query('cursorId') cursorId?: string,
+  ) {
+    return this.postsService.getFeed(req.user.id, {
+      mode: 'mixed',
+      take: take ? Number(take) : undefined,
+      cursorId: cursorId ? Number(cursorId) : undefined,
+    });
+  }
+
+  @Get('discovery')
+  getDiscovery(
+    @Req() req,
+    @Query('take') take?: string,
+    @Query('cursorId') cursorId?: string,
+  ) {
+    return this.postsService.getFeed(req.user.id, {
+      mode: 'discovery',
+      take: take ? Number(take) : undefined,
+      cursorId: cursorId ? Number(cursorId) : undefined,
+    });
+  }
+}

backend/src/posts/posts.service.ts

@@ -0,0 +1,156 @@
+import { Injectable } from '@nestjs/common';
+import { PrismaService } from '../prisma/prisma.service';
+
+type FeedMode = 'mixed' | 'discovery';
+
+type FeedOptions = {
+  mode?: FeedMode;
+  take?: number;
+  cursorId?: number;
+};
+
+@Injectable()
+export class PostsService {
+  constructor(private readonly prisma: PrismaService) {}
+
+  async getFeed(userId: number, options?: FeedOptions) {
+    const mode: FeedMode = options?.mode ?? 'mixed';
+    const take = Math.min(Math.max(options?.take ?? 20, 1), 50);
+    const cursorId = options?.cursorId;
+
+    const include = {
+      pet: {
+        select: {
+          id: true,
+          name: true,
+          type: true,
+          birthDate: true,
+        },
+      },
+      author: {
+  select: {
+    name: true,
+    _count: {
+      select: {
+        followers: true,
+        following: true,
+      },
+    },
+  },
+},
+
+    } as const;
+
+    // Sichtbarkeit
+    const baseWhere =
+  mode === 'discovery'
+    ? {
+        pet: { visibility: 'public' },
+      }
+    : {
+        pet: {
+          OR: [
+            { visibility: 'public' },
+            {
+              visibility: 'followers',
+              owner: {
+                followers: {
+                  some: {
+                    followerId: userId,
+                  },
+                },
+              },
+            },
+          ],
+        },
+      };
+
+
+    const commonQuery = {
+      orderBy: [
+        { createdAt: 'desc' as const },
+        { id: 'desc' as const },
+      ],
+      include,
+      ...(cursorId ? { cursor: { id: cursorId }, skip: 1 } : {}),
+    };
+
+    // -------- Discovery only --------
+    if (mode === 'discovery') {
+      const items = await this.prisma.post.findMany({
+        where: baseWhere,
+        take,
+        ...commonQuery,
+      });
+
+      return {
+        items,
+        nextCursorId:
+          items.length === take ? items[items.length - 1].id : null,
+        meta: { mode, take },
+      };
+    }
+
+    // -------- Mixed Feed (85 / 15) --------
+    const discoveryCount = Math.max(1, Math.round(take * 0.15));
+    const normalCount = take - discoveryCount;
+
+    const [normalItems, discoveryItems] = await Promise.all([
+      this.prisma.post.findMany({
+        where: baseWhere,
+        take: normalCount,
+        ...commonQuery,
+      }),
+      this.prisma.post.findMany({
+        where: { pet: { visibility: 'public' } },
+        take: discoveryCount,
+        ...commonQuery,
+      }),
+    ]);
+
+    // Ruhige Mischung + Duplikat-Schutz
+    const seen = new Set<number>();
+    const merged = [];
+
+    const n = [...normalItems];
+    const d = [...discoveryItems];
+
+    while (merged.length < take && (n.length || d.length)) {
+      for (let i = 0; i < 6 && n.length && merged.length < take; i++) {
+        const item = n.shift();
+        if (item && !seen.has(item.id)) {
+          seen.add(item.id);
+          merged.push(item);
+        }
+      }
+
+      if (d.length && merged.length < take) {
+        const item = d.shift();
+        if (item && !seen.has(item.id)) {
+          seen.add(item.id);
+          merged.push(item);
+        }
+      }
+    }
+
+    while (merged.length < take && n.length) {
+      const item = n.shift();
+      if (item && !seen.has(item.id)) {
+        seen.add(item.id);
+        merged.push(item);
+      }
+    }
+
+    return {
+      items: merged,
+      nextCursorId:
+        merged.length === take ? merged[merged.length - 1].id : null,
+      meta: {
+        mode,
+        take,
+        normalCount,
+        discoveryCount,
+      },
+    };
+  }
+}

backend/src/types/express.d.ts

@@ -0,0 +1,11 @@
+import { RequestUser } from '../auth/types/request-user.type';
+
+declare global {
+  namespace Express {
+    interface Request {
+      user?: RequestUser | null;
+    }
+  }
+}
+
+export {};

backend/src/users/users.service.ts

@@ -0,0 +1,23 @@
+async getUserProfile(userId: number) {
+  const [user, followersCount, followingCount] = await Promise.all([
+    this.prisma.user.findUnique({
+      where: { id: userId },
+      select: {
+        id: true,
+        name: true,
+      },
+    }),
+    this.prisma.follow.count({
+      where: { followingId: userId },
+    }),
+    this.prisma.follow.count({
+      where: { followerId: userId },
+    }),
+  ]);
+
+  return {
+    ...user,
+    followersCount,
+    followingCount,
+  };
+}

backend/tsconfig.json

@@ -0,0 +1,16 @@
+{
+  "compilerOptions": {
+    "module": "CommonJS",
+    "target": "ES2021",
+    "moduleResolution": "node",
+    "experimentalDecorators": true,
+    "emitDecoratorMetadata": true,
+    "esModuleInterop": true,
+    "strict": true,
+    "skipLibCheck": true,
+    "forceConsistentCasingInFileNames": true,
+    "outDir": "dist",
+    "typeRoots": ["./node_modules/@types", "./src/types"]
+  },
+  "include": ["src/**/*.ts"]
+}

docker-compose.db.yml

@@ -0,0 +1,18 @@
+version: "3.9"
+
+services:
+  postgres:
+    image: postgres:16
+    container_name: onlypets-postgres
+    restart: unless-stopped
+    ports:
+      - "55432:5432"
+    environment:
+      POSTGRES_USER: onlypets_user
+      POSTGRES_PASSWORD: onlypets_pass
+      POSTGRES_DB: onlypets
+    volumes:
+      - postgres_data:/var/lib/postgresql/data
+
+volumes:
+  postgres_data:

frontend/app/components/PostCard/PostCard.tsx

@@ -1,242 +1,140 @@
 'use client';
 
-import { useState, useEffect } from 'react';
-import CommentModal from '../CommentModal/CommentModal';
+import { useRef } from 'react';
+import { formatPetAge, isBirthdayToday } from '@/app/lib/petAge';
 
-type Comment = {
+export type PostCardData = {
   id: number;
-  author: string;
+  petName: string;
+  petType: 'Hund' | 'Katze';
+  authorName: string;
+  createdAt: string;
   text: string;
-};
-
-type Media = {
-  type: 'image' | 'video';
-  url: string;
-  aspect: '1:1' | '9:16';
+  likesCount: number;
+  commentsCount: number;
+  
 };
 
 type PostCardProps = {
-  petName: string;
-  petType: 'Hund' | 'Katze';
-  ownerName?: string;
-  text: string;
-  createdAt: string;
-  media?: Media;
-  likes: number;
-  likedByCurrentUser?: boolean;
-  commentsCount: number;
-  commentsList: Comment[];
+  post: PostCardData;
+  isDiscovery?: boolean
+  onOpenPreview: (post: PostCardData) => void;
+  onCommentClick?: (post: PostCardData) => void;
+  
+
 };
 
-// 🔐 Simulierter eingeloggter User
-const CURRENT_USER_ID = 1;
-
 export default function PostCard({
-  petName,
-  petType,
-  ownerName,
-  text,
-  createdAt,
-  media,
-  likes,
-  likedByCurrentUser,
-  commentsCount,
-  commentsList,
+  post,
+  onOpenPreview,
+  onCommentClick,
+  isDiscovery,
 }: PostCardProps) {
-  const [showComments, setShowComments] = useState(false);
-  const [showMediaFullscreen, setShowMediaFullscreen] = useState(false);
+  const likeRef = useRef<HTMLButtonElement | null>(null);
+  const commentRef = useRef<HTMLButtonElement | null>(null);
+  const isBirthday = post.petBirthDate && isBirthdayToday(post.petBirthDate);
 
-  const [localLikes, setLocalLikes] = useState(likes);
-  const [liked, setLiked] = useState(!!likedByCurrentUser);
-
-  const isSquare = media?.aspect === '1:1';
-
-  // ⛔ Scroll sperren bei Vollbild
-  useEffect(() => {
-    if (showMediaFullscreen) {
-      document.body.style.overflow = 'hidden';
-    } else {
-      document.body.style.overflow = '';
-    }
-  }, [showMediaFullscreen]);
+  function animate(
+    ref: React.RefObject<HTMLButtonElement>,
+    animation: string
+  ) {
+    if (!ref.current) return;
+    const el = ref.current;
+    el.style.animation = animation;
+    el.addEventListener(
+      'animationend',
+      () => {
+        el.style.animation = '';
+      },
+      { once: true }
+    );
+  }
 
   return (
-    <>
-      <article
-        style={{
-          border: '1px solid #e5e5e5',
-          borderRadius: '16px',
-          backgroundColor: 'white',
-          overflow: 'hidden',
-        }}
+    <article
+  className={`postcard
+    ${isDiscovery ? 'postcard--discovery' : ''}
+    ${isBirthday ? 'postcard--birthday' : ''}
+  `}
+>
+
+
+      {/* Klickbarer Bereich → Preview */}
+      <div
+        className="postcard-main"
+        onClick={() => onOpenPreview(post)}
       >
-        {/* HEADER */}
-        <header style={{ padding: '1rem', display: 'grid', gap: '0.2rem' }}>
-          <div style={{ fontWeight: 800, fontSize: '1.1rem' }}>
-            {petName}{' '}
-            <span style={{ fontWeight: 500, color: '#666' }}>
-              ({petType})
-            </span>
-          </div>
+        <div className="postcard-media" />
 
-          <div style={{ fontSize: '0.8rem', color: '#777' }}>
-            {createdAt}
-            {ownerName && (
-              <>
-                {' · '}
-                <span style={{ fontStyle: 'italic' }}>
-                  verwaltet von {ownerName}
-                </span>
-              </>
-            )}
-          </div>
-        </header>
+        <div className="postcard-content">
+          <div className="postcard-header">
+  {isDiscovery && (
+    <div className="post-discovery-wrapper">
+      
+    </div>
+  )}
 
-        {/* MEDIA */}
-        {media && (
-          <div
-            onClick={() => setShowMediaFullscreen(true)}
-            style={{
-              width: '100%',
-              aspectRatio: isSquare ? '1 / 1' : '9 / 16',
-              backgroundColor: '#000',
-              cursor: 'pointer',
-            }}
-          >
-            {media.type === 'image' && (
-              <img
-                src={media.url}
-                alt={petName}
-                style={{
-                  width: '100%',
-                  height: '100%',
-                  objectFit: 'cover',
-                }}
-              />
-            )}
+<div className="postcard-title-row">
+  <strong className="postcard-title">
+    {post.petName}
+  </strong>
 
-            {media.type === 'video' && (
-              <video
-                src={media.url}
-                muted
-                style={{
-                  width: '100%',
-                  height: '100%',
-                  objectFit: 'cover',
-                }}
-              />
-            )}
-          </div>
-        )}
+  <span className="postcard-meta">
+    · {post.petType}
+    {post.petBirthDate && ` · ${formatPetAge(post.petBirthDate)}`}
+    · {post.authorName}
+    · {post.createdAt}
+  </span>
 
-        {/* TEXT */}
-        <div style={{ padding: '1rem', fontSize: '0.95rem' }}>
-          {text}
+  {isBirthday && (
+    <span
+      className="birthday-dot"
+      title="Heute ist Geburtstag 🎉"
+      aria-label="Geburtstag"
+    >
+      🎂
+    </span>
+  )}
+</div>
+
+
+
+</div>
+
+          <p className="postcard-text">{post.text}</p>
         </div>
+      </div>
 
-        {/* FOOTER */}
-        <footer
-          style={{
-            padding: '0 1rem 1rem',
-            display: 'flex',
-            gap: '1.2rem',
-            fontSize: '0.85rem',
+      {/* Interaktionen */}
+      <div className="postcard-actions">
+        <button
+          ref={likeRef}
+          type="button"
+          className="postcard-action"
+          onClick={(e) => {
+            e.stopPropagation();
+            animate(likeRef, 'heart-pop 0.3s ease');
+            // später: Like-Logik
           }}
         >
-          <button
-            type="button"
-            onClick={() => {
-              setLiked(!liked);
-              setLocalLikes((prev) => (liked ? prev - 1 : prev + 1));
+          <span aria-hidden>❤️</span>
+          <span>{post.likesCount}</span>
+        </button>
 
-              console.log('LIKE', {
-                byUser: CURRENT_USER_ID,
-                pet: petName,
-              });
-            }}
-            style={{
-              background: 'none',
-              border: 'none',
-              cursor: 'pointer',
-              fontWeight: 600,
-              color: liked ? '#d32f2f' : '#555',
-            }}
-          >
-            ❤️ {localLikes}
-          </button>
-
-          <button
-            type="button"
-            onClick={() => setShowComments(true)}
-            style={{
-              background: 'none',
-              border: 'none',
-              cursor: 'pointer',
-              fontWeight: 600,
-              color: '#2E7D32',
-            }}
-          >
-            💬 {commentsCount} Kommentare
-          </button>
-        </footer>
-      </article>
-
-      {/* 💬 Kommentare */}
-      {showComments && (
-        <CommentModal
-          comments={commentsList}
-          onClose={() => setShowComments(false)}
-        />
-      )}
-
-      {/* 🖼️ MEDIA FULLSCREEN */}
-      {showMediaFullscreen && media && (
-        <div
-          onClick={() => setShowMediaFullscreen(false)}
-          style={{
-            position: 'fixed',
-            inset: 0,
-            backgroundColor: 'rgba(0,0,0,0.9)',
-            display: 'flex',
-            alignItems: 'center',
-            justifyContent: 'center',
-            zIndex: 2000,
-            cursor: 'zoom-out',
+        <button
+          ref={commentRef}
+          type="button"
+          className="postcard-action"
+          onClick={(e) => {
+            e.stopPropagation();
+            animate(commentRef, 'comment-wiggle 0.25s ease');
+            onCommentClick?.(post);
           }}
         >
-          <div
-            onClick={(e) => e.stopPropagation()}
-            style={{
-              maxWidth: '95vw',
-              maxHeight: '95vh',
-            }}
-          >
-            {media.type === 'image' && (
-              <img
-                src={media.url}
-                alt={petName}
-                style={{
-                  maxWidth: '100%',
-                  maxHeight: '100%',
-                  objectFit: 'contain',
-                }}
-              />
-            )}
-
-            {media.type === 'video' && (
-              <video
-                src={media.url}
-                controls
-                autoPlay
-                style={{
-                  maxWidth: '100%',
-                  maxHeight: '100%',
-                }}
-              />
-            )}
-          </div>
-        </div>
-      )}
-    </>
+          <span aria-hidden>💬</span>
+          <span>{post.commentsCount}</span>
+        </button>
+      </div>
+    </article>
   );
 }

frontend/app/explore/page.tsx

@@ -1,26 +1,16 @@
 'use client';
 
 import { useRef, useState } from 'react';
+import PostCard, {
+  PostCardData,
+} from '@/app/components/PostCard/PostCard';
+import { formatPetAge, isBirthdayToday } from '@/app/lib/petAge';
 
-type ExplorePet = {
-  id: number;
-  name: string;
-  type: 'Hund' | 'Katze';
-};
+/* =======================
+   MOCK DATA
+======================= */
 
-type ExplorePost = {
-  id: number;
-  petId: number;
-  petName: string;
-  petType: 'Hund' | 'Katze';
-  authorName: string;
-  createdAt: string;
-  text: string;
-  likesCount: number;
-  commentsCount: number;
-};
-
-const trendingPets: ExplorePet[] = [
+const trendingPets = [
   { id: 1, name: 'Luna', type: 'Katze' },
   { id: 2, name: 'Bello', type: 'Hund' },
   { id: 3, name: 'Milo', type: 'Katze' },
@@ -29,10 +19,9 @@ const trendingPets: ExplorePet[] = [
   { id: 6, name: 'Leo', type: 'Hund' },
 ];
 
-const latestPosts: ExplorePost[] = [
+const latestPosts: PostCardData[] = [
   {
     id: 101,
-    petId: 1,
     petName: 'Luna',
     petType: 'Katze',
     authorName: 'Anna',
@@ -43,7 +32,6 @@ const latestPosts: ExplorePost[] = [
   },
   {
     id: 102,
-    petId: 2,
     petName: 'Bello',
     petType: 'Hund',
     authorName: 'Markus',
@@ -54,7 +42,6 @@ const latestPosts: ExplorePost[] = [
   },
   {
     id: 103,
-    petId: 3,
     petName: 'Milo',
     petType: 'Katze',
     authorName: 'Sophie',
@@ -65,7 +52,6 @@ const latestPosts: ExplorePost[] = [
   },
   {
     id: 104,
-    petId: 4,
     petName: 'Rocky',
     petType: 'Hund',
     authorName: 'Timo',
@@ -76,15 +62,20 @@ const latestPosts: ExplorePost[] = [
   },
 ];
 
+/* =======================
+   PAGE
+======================= */
+
 export default function ExplorePage() {
-  const [activeFilter, setActiveFilter] = useState<
-    'ALLE' | 'HUND' | 'KATZE'
-  >('ALLE');
+  const [activeFilter, setActiveFilter] =
+    useState<'ALLE' | 'HUND' | 'KATZE'>('ALLE');
 
-  const [previewPost, setPreviewPost] = useState<ExplorePost | null>(null);
-const [openComments, setOpenComments] = useState(false);
+  const [previewPost, setPreviewPost] =
+    useState<PostCardData | null>(null);
 
-  // Swipe-Down Handling fürs Modal
+  const [openComments, setOpenComments] = useState(false);
+
+  // Swipe-Down fürs Modal
   const startY = useRef<number | null>(null);
 
   const filteredPosts = latestPosts.filter((p) => {
@@ -96,90 +87,46 @@ const [openComments, setOpenComments] = useState(false);
   return (
     <>
       {/* ================= HEADER / FILTER ================= */}
-      <section
-        style={{
-          padding: '1rem',
-          display: 'grid',
-          gap: '1rem',
-          maxWidth: '720px',
-          margin: '0 auto',
-        }}
-      >
+      <section className="explore-header">
         <header>
-          <h1 style={{ marginBottom: '0.3rem' }}>Entdecken</h1>
-          <p style={{ margin: 0, color: '#666' }}>
-            Neue Tiere, Trends & besondere Momente
-          </p>
+          <h1>Entdecken</h1>
+          <p>Neue Tiere, Trends & besondere Momente</p>
         </header>
 
-        <div style={{ display: 'flex', gap: '0.5rem' }}>
+        <div className="explore-filter">
           {[
             { key: 'ALLE', label: 'Alle' },
             { key: 'HUND', label: 'Hunde' },
             { key: 'KATZE', label: 'Katzen' },
-          ].map((f) => {
-            const active = activeFilter === f.key;
-            return (
-              <button
-                key={f.key}
-                onClick={() =>
-                  setActiveFilter(f.key as 'ALLE' | 'HUND' | 'KATZE')
-                }
-                style={{
-                  padding: '0.45rem 0.9rem',
-                  borderRadius: '999px',
-                  border: active ? 'none' : '1px solid #ccc',
-                  backgroundColor: active ? '#2E7D32' : 'white',
-                  color: active ? 'white' : 'inherit',
-                  fontSize: '0.75rem',
-                  fontWeight: active ? 600 : 400,
-                  cursor: 'pointer',
-                  transform: active ? 'scale(1.05)' : 'scale(1)',
-                  transition:
-                    'background-color 0.2s ease, transform 0.15s ease',
-                }}
-              >
-                {f.label}
-              </button>
-            );
-          })}
+          ].map((f) => (
+            <button
+              key={f.key}
+              className={
+                activeFilter === f.key
+                  ? 'filter-button active'
+                  : 'filter-button'
+              }
+              onClick={() =>
+                setActiveFilter(f.key as 'ALLE' | 'HUND' | 'KATZE')
+              }
+            >
+              {f.label}
+            </button>
+          ))}
         </div>
       </section>
 
       {/* ================= BELIEBTE TIERE ================= */}
-      <section style={{ paddingLeft: '1rem', marginBottom: '1.5rem' }}>
-        <strong style={{ display: 'block', marginBottom: '0.6rem' }}>
-          Beliebte Tiere
-        </strong>
+      <section className="explore-trending">
+        <strong>Beliebte Tiere</strong>
 
-        <div
-          className="hide-scrollbar"
-          style={{
-            display: 'flex',
-            gap: '0.8rem',
-            overflowX: 'auto',
-            WebkitOverflowScrolling: 'touch',
-          }}
-        >
+        <div className="trending-scroll hide-scrollbar">
           {trendingPets.map((pet) => (
-            <div key={pet.id} style={{ width: '84px', flex: '0 0 auto' }}>
-              <div
-                style={{
-                  width: '84px',
-                  height: '84px',
-                  borderRadius: '18px',
-                  backgroundColor: '#f2f2f2',
-                  display: 'flex',
-                  alignItems: 'center',
-                  justifyContent: 'center',
-                  fontSize: '1.4rem',
-                }}
-              >
-                🐾
-              </div>
-              <div style={{ marginTop: '0.4rem', fontSize: '0.72rem' }}>
+            <div key={pet.id} className="trending-item">
+              <div className="trending-avatar">🐾</div>
+              <div className="trending-meta">
                 <strong>{pet.name}</strong>
-                <div style={{ color: '#777' }}>{pet.type}</div>
+                <span>{pet.type}</span>
               </div>
             </div>
           ))}
@@ -187,151 +134,23 @@ const [openComments, setOpenComments] = useState(false);
       </section>
 
       {/* ================= POSTS ================= */}
-      <section
-        style={{
-          padding: '0 1rem 1rem',
-          maxWidth: '720px',
-          margin: '0 auto',
-        }}
-      >
-        <strong style={{ display: 'block', marginBottom: '0.6rem' }}>
-          Neueste Beiträge
-        </strong>
+      <section className="explore-posts">
+        <strong>Neueste Beiträge</strong>
 
-        <div style={{ display: 'flex', flexDirection: 'column', gap: '0.9rem' }}>
+        <div className="post-list">
           {filteredPosts.map((post) => (
-            <article
+            <PostCard
               key={post.id}
-              style={{
-                border: '1px solid #eee',
-                borderRadius: '18px',
-                overflow: 'hidden',
-                backgroundColor: 'white',
+              post={post}
+              onOpenPreview={(p) => {
+                setOpenComments(false);
+                setPreviewPost(p);
               }}
-            >
-              {/* ✅ Nur dieser Bereich öffnet das Modal */}
-              <div
-                onClick={() => setPreviewPost(post)}
-                style={{ cursor: 'pointer' }}
-              >
-                <div
-                  style={{
-                    width: '100%',
-                    aspectRatio: '3 / 2',
-                    backgroundColor: '#eaeaea',
-                  }}
-                />
-
-                <div style={{ padding: '0.8rem', display: 'grid', gap: '0.35rem' }}>
-                  <div
-                    style={{
-                      display: 'flex',
-                      justifyContent: 'space-between',
-                      gap: '0.6rem',
-                    }}
-                  >
-                    <div>
-                      <strong>{post.petName}</strong>{' '}
-                      <span style={{ color: '#777', fontSize: '0.8rem' }}>
-                        · {post.petType} · {post.authorName}
-                      </span>
-                    </div>
-                    <span
-                      style={{
-                        color: '#777',
-                        fontSize: '0.8rem',
-                        whiteSpace: 'nowrap',
-                      }}
-                    >
-                      {post.createdAt}
-                    </span>
-                  </div>
-
-                  <p style={{ margin: 0, fontSize: '0.9rem' }}>{post.text}</p>
-                </div>
-              </div>
-
-              {/* ✅ Interaktionszeile (öffnet KEIN Modal) */}
-              <div
-                style={{
-                  padding: '0 0.8rem 0.8rem',
-                  display: 'flex',
-                  gap: '1rem',
-                  fontSize: '0.85rem',
-                  color: '#555',
-                }}
-              >
-                <button
-  type="button"
-  onClick={(e) => {
-    e.stopPropagation();
-
-    const el = e.currentTarget;
-    el.style.animation = 'heart-pop 0.3s ease';
-    el.addEventListener(
-      'animationend',
-      () => {
-        el.style.animation = '';
-      },
-      { once: true }
-    );
-
-    console.log('LIKE CLICK', post.id);
-  }}
-  style={{
-    border: 'none',
-    background: 'transparent',
-    padding: 0,
-    cursor: 'pointer',
-    display: 'flex',
-    gap: '0.35rem',
-    alignItems: 'center',
-    color: 'inherit',
-  }}
->
-  <span aria-hidden>❤️</span>
-  <span>{post.likesCount}</span>
-</button>
-
-
-                <button
-  type="button"
-  onClick={(e) => {
-    e.stopPropagation();
-
-    // Animation
-    const el = e.currentTarget;
-    el.style.animation = 'comment-wiggle 0.25s ease';
-    el.addEventListener(
-      'animationend',
-      () => {
-        el.style.animation = '';
-      },
-      { once: true }
-    );
-
-    // 👉 LOGIK
-    setOpenComments(true);
-    setPreviewPost(post);
-  }}
-  style={{
-    border: 'none',
-    background: 'transparent',
-    padding: 0,
-    cursor: 'pointer',
-    display: 'flex',
-    gap: '0.35rem',
-    alignItems: 'center',
-    color: 'inherit',
-  }}
->
-  <span aria-hidden>💬</span>
-  <span>{post.commentsCount}</span>
-</button>
-
-
-              </div>
-            </article>
+              onCommentClick={(p) => {
+                setOpenComments(true);
+                setPreviewPost(p);
+              }}
+            />
           ))}
         </div>
       </section>
@@ -339,127 +158,63 @@ const [openComments, setOpenComments] = useState(false);
       {/* ================= PREVIEW MODAL ================= */}
       {previewPost && (
         <div
-          onClick={() => setPreviewPost(null)}
-          style={{
-            position: 'fixed',
-            inset: 0,
-            backgroundColor: 'rgba(0,0,0,0.4)',
-            zIndex: 50,
-            display: 'flex',
-            justifyContent: 'center',
-            alignItems: 'flex-end',
+          className="post-preview-overlay"
+          onClick={() => {
+            setPreviewPost(null);
+            setOpenComments(false);
           }}
         >
           <div
+            className="post-preview-modal"
             onClick={(e) => e.stopPropagation()}
-            onTouchStart={(e) => (startY.current = e.touches[0].clientY)}
+            onTouchStart={(e) =>
+              (startY.current = e.touches[0].clientY)
+            }
             onTouchEnd={(e) => {
               if (
                 startY.current &&
                 e.changedTouches[0].clientY - startY.current > 80
               ) {
                 setPreviewPost(null);
-setOpenComments(false);
-
+                setOpenComments(false);
               }
             }}
-            style={{
-              backgroundColor: 'white',
-              width: '100%',
-              maxWidth: '720px',
-              borderTopLeftRadius: '22px',
-              borderTopRightRadius: '22px',
-              padding: '1rem',
-              animation: 'slideUp 0.25s ease',
-              paddingBottom: '5rem',
-
-            }}
           >
-            <div
-              style={{
-                width: '36px',
-                height: '4px',
-                borderRadius: '999px',
-                backgroundColor: '#ccc',
-                margin: '0 auto 0.8rem',
-              }}
-            />
+            <div className="modal-handle" />
 
-            <div
-              style={{
-                width: '100%',
-                aspectRatio: '3 / 2',
-                backgroundColor: '#eaeaea',
-                borderRadius: '14px',
-                marginBottom: '0.8rem',
-              }}
-            />
+            <div className="modal-media" />
 
             <strong>{previewPost.petName}</strong>{' '}
-            <span style={{ color: '#777', fontSize: '0.85rem' }}>
+            <span className="modal-meta">
               · {previewPost.petType} · {previewPost.authorName}
             </span>
 
-            <p style={{ marginTop: '0.6rem' }}>{previewPost.text}</p>
-{openComments && (
-  <div
-    style={{
-      marginTop: '1rem',
-      paddingTop: '0.8rem',
-      borderTop: '1px solid #eee',
-    }}
-  >
-    <strong style={{ fontSize: '0.9rem' }}>Kommentare</strong>
+            <p className="modal-text">{previewPost.text}</p>
 
-    <div
-      style={{
-        marginTop: '0.6rem',
-        fontSize: '0.85rem',
-        color: '#666',
-      }}
-    >
-      Noch keine Kommentare.
-    </div>
+            <div className="modal-stats">
+              <span>❤️ {previewPost.likesCount}</span>
+              <span>💬 {previewPost.commentsCount}</span>
+            </div>
 
-    <input
-      placeholder="Kommentar schreiben…"
-      style={{
-        marginTop: '0.6rem',
-        width: '100%',
-        padding: '0.6rem 0.8rem',
-        borderRadius: '999px',
-        border: '1px solid #ccc',
-        fontSize: '0.85rem',
-      }}
-      autoFocus
-    />
-  </div>
-)}
+            {openComments && (
+              <div className="modal-comments">
+                <strong>Kommentare</strong>
+                <p className="modal-comment-empty">
+                  Noch keine Kommentare.
+                </p>
 
-            <div
-              style={{
-                display: 'flex',
-                justifyContent: 'space-between',
-                alignItems: 'center',
-                marginTop: '1rem',
-              }}
-            >
-              <div style={{ fontSize: '0.9rem', color: '#555', display: 'flex', gap: '1rem' }}>
-                <span>❤️ {previewPost.likesCount}</span>
-                <span>💬 {previewPost.commentsCount}</span>
+                <input
+                  className="modal-comment-input"
+                  placeholder="Kommentar schreiben…"
+                  autoFocus
+                />
               </div>
+            )}
 
+            <div className="modal-actions">
               <a
                 href={`/post/${previewPost.id}`}
-                style={{
-                  padding: '0.5rem 0.9rem',
-                  borderRadius: '999px',
-                  backgroundColor: '#2E7D32',
-                  color: 'white',
-                  textDecoration: 'none',
-                  fontSize: '0.85rem',
-                  fontWeight: 600,
-                }}
+                className="modal-open-post"
               >
                 Zum Beitrag
               </a>

frontend/app/feed/page.tsx

@@ -1,179 +1,238 @@
 'use client';
 
-import { useState } from 'react';
-import PostCard from '../components/PostCard/PostCard';
-import FreshPostsSlider from '../components/FreshPostsSlider/FreshPostsSlider';
+import { useRef, useState } from 'react';
+import PostCard, {
+  PostCardData,
+} from '@/app/components/PostCard/PostCard';
+import { formatPetAge, isBirthdayToday } from '@/app/lib/petAge';
 
-/* ---------------- TYPES ---------------- */
+/* =======================
+   MOCK: USER KONTEXT
+======================= */
 
-type Comment = {
-  id: number;
-  author: string;
-  text: string;
-};
-
-type Media = {
-  type: 'image' | 'video';
-  url: string;
-  aspect: '1:1' | '9:16';
-};
-
-type FeedPost = {
-  id: number;
-
-  // 🐾 Tier (Absender)
-  petId: number;
-  petName: string;
-  petType: 'Hund' | 'Katze';
-
-  // 👤 Admin (sekundär)
-  ownerId: number;
-  ownerName: string;
-
-  // 📝 Inhalt
-  text: string;
-  createdAt: string;
-
-  // 📸 / 🎥 Media
-  media?: Media;
-
-  // ❤️ Interaktion
-  likes: number;
-  //likedByCurrentUser: number; // ✅ FEHLTE
-  commentsCount: number;
-  commentsList: Comment[];
-};
-
-type FeedAdmin = {
-  id: number;
-  name: string;
-  avatar: string;
-};
-
-/* ---------------- MOCK ADMINS ---------------- */
-
-const mockAdmins: FeedAdmin[] = [
+const myPets = [
   {
     id: 1,
-    name: 'Anna',
-    avatar: 'https://i.pravatar.cc/100?img=12',
-  },
-  {
-    id: 2,
-    name: 'Markus',
-    avatar: 'https://i.pravatar.cc/100?img=32',
+    petType: 'Katze',
+    breed: 'Bengal',
+    ageMonths: 24,
   },
 ];
 
-/* ---------------- MOCK POSTS ---------------- */
+const followedPetIds = [1, 3, 5];
 
-const mockPosts: FeedPost[] = [
+/* =======================
+   MOCK: POSTS
+======================= */
+
+type FeedPost = PostCardData & {
+  petId: number;
+  breed: string;
+  ageMonths: number;
+};
+
+const allPosts: FeedPost[] = [
   {
-    id: 1,
+    id: 401,
     petId: 1,
     petName: 'Luna',
     petType: 'Katze',
-
-    ownerId: 1,
-    ownerName: 'Anna',
-
-    text: 'Luna genießt die Sonne auf dem Balkon ☀️',
-    createdAt: 'vor 2 Stunden',
-
-    media: {
-      type: 'image',
-      url: 'https://placekitten.com/600/600',
-      aspect: '1:1',
-    },
-
-    likes: 12,
+    breed: 'Bengal',
+    ageMonths: 26,
+    authorName: 'Anna',
+    createdAt: 'vor 10 Minuten',
+    text: 'Luna liebt den neuen Kratzbaum.',
+    likesCount: 8,
     commentsCount: 2,
-    commentsList: [
-      { id: 1, author: 'Lisa', text: 'Wie süß 😍' },
-      { id: 2, author: 'Tom', text: 'Typisch Katze!' },
-    ],
   },
   {
-    id: 2,
+    id: 402,
     petId: 2,
-    petName: 'Bello',
+    petName: 'Rocky',
     petType: 'Hund',
-
-    ownerId: 2,
-    ownerName: 'Markus',
-
-    text: 'Spaziergang im Park – jemand hatte sehr viel Energie 🐕',
-    createdAt: 'heute Morgen',
-
-    media: {
-      type: 'video',
-      url: 'https://www.w3schools.com/html/mov_bbb.mp4',
-      aspect: '9:16',
-    },
-
-    likes: 20,
-    
-
-    commentsCount: 0,
-    commentsList: [],
+    breed: 'Labrador',
+    ageMonths: 30,
+    authorName: 'Tim',
+    createdAt: 'vor 1 Stunde',
+    text: 'Rocky war schwimmen 🐕‍🦺',
+    likesCount: 15,
+    commentsCount: 4,
+  },
+  {
+    id: 403,
+    petId: 3,
+    petName: 'Milo',
+    petType: 'Katze',
+    breed: 'Bengal',
+    ageMonths: 22,
+    authorName: 'Sophie',
+    createdAt: 'heute',
+    text: 'Milo entdeckt den Balkon.',
+    likesCount: 11,
+    commentsCount: 3,
+  },
+  {
+    id: 404,
+    petId: 4,
+    petName: 'Nala',
+    petType: 'Katze',
+    breed: 'Maine Coon',
+    ageMonths: 40,
+    authorName: 'Laura',
+    createdAt: 'gestern',
+    text: 'Nala beobachtet alles ganz ruhig.',
+    likesCount: 6,
+    commentsCount: 1,
   },
 ];
 
-/* ---------------- PAGE ---------------- */
+/* =======================
+   RELEVANZ LOGIK
+======================= */
+
+function relevanceScore(post: FeedPost) {
+  let score = 0;
+
+  myPets.forEach((pet) => {
+    if (post.petType === pet.petType) score += 3;
+    if (post.breed === pet.breed) score += 5;
+    if (Math.abs(post.ageMonths - pet.ageMonths) <= 6) score += 2;
+  });
+
+  score += Math.min(post.likesCount / 10, 3);
+  score += Math.min(post.commentsCount / 5, 2);
+
+  return score;
+}
+
+/* =======================
+   PAGE
+======================= */
 
 export default function FeedPage() {
-  const [selectedOwnerId, setSelectedOwnerId] = useState<number | null>(null);
+  const [previewPost, setPreviewPost] =
+    useState<PostCardData | null>(null);
+  const [openComments, setOpenComments] = useState(false);
 
-  const visiblePosts = selectedOwnerId
-    ? mockPosts.filter((post) => post.ownerId === selectedOwnerId)
-    : mockPosts;
+  const startY = useRef<number | null>(null);
+
+  /* =======================
+     FEED ZUSAMMENSTELLEN
+  ======================= */
+
+  const subscribedPosts = allPosts.filter((post) =>
+    followedPetIds.includes(post.petId)
+  );
+
+  const discoveryPosts = allPosts
+    .filter((post) => !followedPetIds.includes(post.petId))
+    .sort((a, b) => relevanceScore(b) - relevanceScore(a));
+
+  const FEED_SIZE = 20;
+  const DISCOVERY_RATIO = 0.15;
+
+  const discoveryCount = Math.max(
+    1,
+    Math.round(FEED_SIZE * DISCOVERY_RATIO)
+  );
+
+  const finalFeed = [
+    ...subscribedPosts
+      .slice(0, FEED_SIZE - discoveryCount)
+      .map((p) => ({ ...p, isDiscovery: false })),
+
+    ...discoveryPosts
+      .slice(0, discoveryCount)
+      .map((p) => ({ ...p, isDiscovery: true })),
+  ];
 
   return (
-    <section
-      style={{
-        maxWidth: '600px',
-        margin: '0 auto',
-        display: 'grid',
-        gap: '1.5rem',
-      }}
-    >
-      {/* HEADER */}
-      <header>
-        <h1 style={{ marginBottom: '0.3rem' }}>Feed</h1>
-        <p style={{ margin: 0, color: '#555' }}>
-          Neueste Beiträge aus der OnlyPets-Community
-        </p>
-      </header>
-
-      {/* 🔄 Frische Tier-Admins Slider */}
-      <FreshPostsSlider
-        users={mockAdmins}
-        onSelectUser={setSelectedOwnerId}
-      />
-
-      {/* 📰 FEED */}
-      <section style={{ display: 'grid', gap: '1.5rem' }}>
-        {visiblePosts.length === 0 && (
-          <p style={{ color: '#777' }}>
-            Keine Beiträge von diesen Tier-Admins.
-          </p>
-        )}
-
-        {visiblePosts.map((post) => (
-          <PostCard
-            key={post.id}
-            petName={post.petName}
-            petType={post.petType}
-            ownerName={post.ownerName}
-            text={post.text}
-            createdAt={post.createdAt}
-            media={post.media}
-            likes={post.likes}
-            commentsCount={post.commentsCount}
-            commentsList={post.commentsList}
-          />
-        ))}
+    <>
+      {/* ================= HEADER ================= */}
+      <section className="feed-header">
+        <header>
+          <h1>Feed</h1>
+          <p>Beiträge deiner Tiere & Abos</p>
+        </header>
       </section>
-    </section>
+
+      {/* ================= POSTS ================= */}
+      <section className="feed-posts">
+        <div className="post-list">
+          {finalFeed.map((post) => (
+            <PostCard
+              key={post.id}
+              post={post}
+              isDiscovery={post.isDiscovery}
+              onOpenPreview={(p) => {
+                setOpenComments(false);
+                setPreviewPost(p);
+              }}
+              onCommentClick={(p) => {
+                setOpenComments(true);
+                setPreviewPost(p);
+              }}
+            />
+          ))}
+        </div>
+      </section>
+
+      {/* ================= PREVIEW MODAL ================= */}
+      {previewPost && (
+        <div
+          className="post-preview-overlay"
+          onClick={() => {
+            setPreviewPost(null);
+            setOpenComments(false);
+          }}
+        >
+          <div
+            className="post-preview-modal"
+            onClick={(e) => e.stopPropagation()}
+            onTouchStart={(e) =>
+              (startY.current = e.touches[0].clientY)
+            }
+            onTouchEnd={(e) => {
+              if (
+                startY.current &&
+                e.changedTouches[0].clientY - startY.current > 80
+              ) {
+                setPreviewPost(null);
+                setOpenComments(false);
+              }
+            }}
+          >
+            <div className="modal-handle" />
+            <div className="modal-media" />
+
+            <strong>{previewPost.petName}</strong>{' '}
+            <span className="modal-meta">
+              · {previewPost.petType} · {previewPost.authorName}
+            </span>
+
+            <p className="modal-text">{previewPost.text}</p>
+
+            <div className="modal-stats">
+              <span>❤️ {previewPost.likesCount}</span>
+              <span>💬 {previewPost.commentsCount}</span>
+            </div>
+
+            {openComments && (
+              <div className="modal-comments">
+                <strong>Kommentare</strong>
+                <p className="modal-comment-empty">
+                  Noch keine Kommentare.
+                </p>
+                <input
+                  className="modal-comment-input"
+                  placeholder="Kommentar schreiben…"
+                  autoFocus
+                />
+              </div>
+            )}
+          </div>
+        </div>
+      )}
+    </>
   );
 }

frontend/app/globals.css

@@ -1,23 +1,51 @@
 @import "tailwindcss";
 
+* {
+  box-sizing: border-box;
+}
 :root {
-  --background: #ffffff;
-  --foreground: #171717;
+  /* ===== COLORS ===== */
+  --color-primary: #2e7d32;
+  --color-primary-soft: #e6efe9;
+
+  --color-bg: #f6faf7;
+  --color-surface: #ffffff;
+
+  --color-text-main: #1f2d24;
+  --color-text-secondary: #5f6f66;
+  --color-text-muted: #8a9b92;
+
+  --color-border: rgba(0, 0, 0, 0.06);
+
+  /* ===== SHADOWS ===== */
+  --shadow-sm: 0 2px 6px rgba(0, 0, 0, 0.05);
+  --shadow-md: 0 8px 20px rgba(0, 0, 0, 0.08);
+  --shadow-lg: 0 20px 40px rgba(0, 0, 0, 0.12);
+
+  /* ===== RADIUS ===== */
+  --radius-sm: 10px;
+  --radius-md: 14px;
+  --radius-lg: 18px;
+
+  /* ===== SPACING ===== */
+  --space-xs: 0.25rem;
+  --space-sm: 0.5rem;
+  --space-md: 1rem;
+  --space-lg: 1.5rem;
+  --space-xl: 2rem;
+}
+html, body {
+  background: var(--color-bg);
+  color: var(--color-text-main);
+  font-family: system-ui, -apple-system, BlinkMacSystemFont, sans-serif;
+  line-height: 1.5;
 }
 
-@theme inline {
-  --color-background: var(--background);
-  --color-foreground: var(--foreground);
-  --font-sans: var(--font-geist-sans);
-  --font-mono: var(--font-geist-mono);
-}
 
-@media (prefers-color-scheme: dark) {
-  :root {
-    --background: #0a0a0a;
-    --foreground: #ededed;
-  }
-}
+
+
+
+
 
 body {
   background: var(--background);
@@ -96,4 +124,627 @@ body {
     transform: translateY(0);
   }
 }
+@keyframes spin {
+  to {
+    transform: rotate(360deg);
+  }
+}
 
+.postcard {
+  background: var(--color-surface);
+  border-radius: var(--radius-lg);
+  border: 1px solid var(--color-border);
+  box-shadow: var(--shadow-sm);
+  padding: var(--space-md);
+  display: flex;
+  flex-direction: column;
+  gap: var(--space-sm);
+  transition: box-shadow 0.2s ease, transform 0.2s ease;
+}
+
+.postcard:hover {
+  box-shadow: var(--shadow-md);
+  transform: translateY(-1px);
+}
+.postcard-content {
+  font-size: 0.95rem;
+  color: var(--color-text-secondary);
+}
+.postcard-actions {
+  display: flex;
+  gap: var(--space-md);
+  align-items: center;
+  font-size: 0.85rem;
+  color: var(--color-text-muted);
+}
+
+.postcard-action {
+  display: flex;
+  align-items: center;
+  gap: 0.3rem;
+  cursor: pointer;
+  user-select: none;
+}
+
+.postcard-action:hover {
+  color: var(--color-text-main);
+}
+.postcard--discovery {
+  border: 1px solid var(--color-primary);
+  box-shadow:
+    0 0 0 1px rgba(236, 214, 15, 0.925),
+    var(--shadow-sm);
+}
+.feed-header,
+.explore-header {
+  padding: var(--space-lg) var(--space-md) var(--space-md);
+}
+
+/*.feed-header p,
+.explore-header p {
+  color: var(--color-text-secondary);
+  margin: 0.25rem 0 0;
+}*/
+.post-list {
+  display: flex;
+  flex-direction: column;
+  gap: var(--space-md);
+  padding-bottom: calc(var(--space-xl) + 60px);
+}
+.fresh-scroll,
+.trending-scroll {
+  display: flex;
+  gap: var(--space-sm);
+  overflow-x: auto;
+  padding: var(--space-sm) var(--space-md);
+}
+
+
+
+.hide-scrollbar::-webkit-scrollbar {
+  display: none;
+}
+.fresh-item,
+.trending-item {
+  background: var(--color-surface);
+  border-radius: var(--radius-md);
+  padding: var(--space-sm);
+  min-width: 80px;
+  display: flex;
+  flex-direction: column;
+  align-items: center;
+  gap: 0.3rem;
+  box-shadow: var(--shadow-sm);
+  border: 1px solid var(--color-border);
+}
+.profile-header {
+  display: flex;
+  gap: var(--space-lg);
+  padding: var(--space-lg);
+  margin: var(--space-md);
+  background: var(--color-surface);
+  border-radius: var(--radius-lg);
+  border: 1px solid var(--color-border);
+  box-shadow: var(--shadow-sm);
+}
+.profile-avatar {
+  width: 72px;
+  height: 72px;
+  border-radius: 50%;
+  background: var(--color-primary-soft);
+  display: flex;
+  align-items: center;
+  justify-content: center;
+  font-size: 2rem;
+}
+.profile-info h1 {
+  font-size: 1.3rem;
+  margin: 0;
+}
+
+.profile-username {
+  font-size: 0.85rem;
+  color: var(--color-text-muted);
+}
+
+.profile-bio {
+  margin-top: var(--space-sm);
+  font-size: 0.9rem;
+  color: var(--color-text-secondary);
+}
+
+
+.profile-stats {
+  display: flex;
+  gap: var(--space-lg);
+  margin-top: var(--space-md);
+}
+
+.profile-stats div {
+  text-align: center;
+}
+
+.profile-stats strong {
+  font-size: 1.05rem;
+  font-weight: 600;
+}
+
+.profile-stats span {
+  font-size: 0.75rem;
+  color: var(--color-text-muted);
+}
+.profile-pets {
+  margin-top: var(--space-lg);
+  padding: 0 var(--space-md);
+}
+
+.profile-pets h2 {
+  font-size: 1.1rem;
+  margin-bottom: var(--space-sm);
+}
+.pets-grid {
+  display: grid;
+  grid-template-columns: repeat(auto-fill, minmax(120px, 1fr));
+  gap: var(--space-md);
+}
+.pet-card {
+  background: var(--color-surface);
+  border-radius: var(--radius-md);
+  border: 1px solid var(--color-border);
+  box-shadow: var(--shadow-sm);
+  padding: var(--space-sm);
+  text-align: center;
+  transition: box-shadow 0.2s ease, transform 0.2s ease;
+}
+.profile-posts {
+  margin-top: var(--space-xl);
+}
+
+.profile-posts h2 {
+  font-size: 1.1rem;
+  margin: 0 var(--space-md) var(--space-sm);
+}
+
+.pet-card:hover {
+  box-shadow: var(--shadow-md);
+  transform: translateY(-1px);
+}
+
+.post-preview-overlay {
+  position: fixed;
+  inset: 0;
+  background: rgba(0, 0, 0, 0.35);
+  display: flex;
+  justify-content: center;
+  align-items: flex-end;
+  z-index: 50;
+  overflow: hidden;
+}
+
+.post-preview-modal {
+  background: var(--color-surface);
+  width: 100%;
+  max-width: 600px;
+
+  /* 🔥 DAS FEHLT */
+  max-height: calc(100vh - 70px); /* Platz für Statusbar */
+  overflow-y: auto;
+
+  border-radius: var(--radius-lg) var(--radius-lg) 0 0;
+  padding: var(--space-lg);
+  box-shadow: var(--shadow-lg);
+  padding-bottom: calc(var(--space-xl) + 60px);
+}
+
+.explore-filter {
+  display: flex;
+  gap: var(--space-sm);
+  margin-top: var(--space-md);
+}
+
+.filter-button {
+  padding: 0.4rem 0.8rem;
+  border-radius: 999px;
+  border: 1px solid var(--color-border);
+  background: var(--color-surface);
+  font-size: 0.85rem;
+  color: var(--color-text-secondary);
+  cursor: pointer;
+}
+
+.filter-button.active {
+  background: var(--color-primary);
+  color: white;
+  border-color: var(--color-primary);
+}
+
+.explore-header,
+.explore-trending,
+.explore-posts {
+  padding: 0 var(--space-md);
+}
+
+.explore-trending,
+.explore-posts {
+  margin-top: var(--space-lg);
+}
+.explore-header h1 {
+  font-size: 1.4rem;
+  margin-bottom: 0.2rem;
+}
+
+.explore-header p {
+  font-size: 0.9rem;
+  color: var(--color-text-secondary);
+}
+
+.explore-trending strong,
+.explore-posts strong {
+  display: block;
+  margin-bottom: var(--space-sm);
+}
+.feed-header {
+  padding: var(--space-lg) var(--space-md) var(--space-md);
+}
+
+.feed-header h1 {
+  font-size: 1.4rem;
+  margin-bottom: 0.2rem;
+}
+
+.feed-header p {
+  font-size: 0.9rem;
+  color: var(--color-text-secondary);
+}
+.feed-posts {
+  margin-top: var(--space-md);
+}
+.feed-posts .postcard {
+  margin-bottom: var(--space-md);
+}
+.feed-header h1::after {
+  content: '•';
+  margin-left: 0.4rem;
+  color: var(--color-primary);
+}
+.pets-page {
+  padding-bottom: calc(var(--space-xl) + 60px); /* Abstand zur BottomNav */
+}
+.pets-header {
+  padding: var(--space-lg) var(--space-md) var(--space-md);
+}
+
+.pets-header h1 {
+  font-size: 1.4rem;
+  margin-bottom: 0.25rem;
+}
+
+.pets-header p {
+  font-size: 0.9rem;
+  color: var(--color-text-secondary);
+  margin: 0;
+}
+.pets-grid {
+  display: grid;
+  grid-template-columns: repeat(auto-fill, minmax(140px, 1fr));
+  gap: var(--space-md);
+  padding: 0 var(--space-md);
+}
+.pet-card {
+  background: var(--color-surface);
+  border-radius: var(--radius-lg);
+  border: 1px solid var(--color-border);
+  box-shadow: var(--shadow-sm);
+  padding: var(--space-md);
+  text-align: center;
+  text-decoration: none;
+  color: inherit;
+  display: flex;
+  flex-direction: column;
+  gap: 0.3rem;
+  transition: box-shadow 0.2s ease, transform 0.2s ease;
+}
+
+.pet-card:hover {
+  box-shadow: var(--shadow-md);
+  transform: translateY(-1px);
+}
+.pet-avatar {
+  width: 56px;
+  height: 56px;
+  border-radius: 50%;
+  background: var(--color-primary-soft);
+  display: flex;
+  align-items: center;
+  justify-content: center;
+  font-size: 1.6rem;
+  margin: 0 auto var(--space-sm);
+}
+.pet-name {
+  font-size: 1rem;
+  font-weight: 600;
+}
+
+.pet-meta {
+  font-size: 0.8rem;
+  color: var(--color-text-muted);
+}
+
+.pet-age {
+  font-size: 0.75rem;
+  color: var(--color-text-secondary);
+}
+.pets-actions {
+  margin-top: var(--space-xl);
+  padding: 0 var(--space-md);
+}
+.button-primary {
+  display: inline-flex;
+  justify-content: center;
+  align-items: center;
+  gap: 0.4rem;
+  padding: 0.8rem 1.2rem;
+  border-radius: 12px;
+  background: var(--color-primary);
+  color: white;
+  font-weight: 600;
+  text-decoration: none;
+  border: none;
+  cursor: pointer;
+  box-shadow: var(--shadow-sm);
+  transition: box-shadow 0.2s ease, transform 0.15s ease;
+}
+
+.button-primary:hover {
+  box-shadow: var(--shadow-md);
+  transform: translateY(-1px);
+}
+.button-secondary {
+  display: inline-flex;
+  justify-content: center;
+  align-items: center;
+  padding: 0.8rem 1.2rem;
+  border-radius: 12px;
+  background: var(--color-surface);
+  color: var(--color-text-main);
+  border: 1px solid var(--color-border);
+  font-weight: 500;
+  cursor: pointer;
+}
+.button-danger {
+  display: inline-flex;
+  justify-content: center;
+  align-items: center;
+  gap: 0.4rem;
+
+  padding: 0.8rem 1.2rem;
+  border-radius: 12px; /* 🔴 gleiche Rundung wie grün */
+
+  background: #c62828;
+  color: white;
+  font-weight: 600;
+
+  border: none;
+  cursor: pointer;
+  text-decoration: none;
+
+  box-shadow: var(--shadow-sm);
+  transition: box-shadow 0.2s ease, transform 0.15s ease;
+}
+
+.button-danger:hover {
+  background: #b71c1c;
+  box-shadow: var(--shadow-md);
+}
+.button-danger:active {
+  transform: scale(0.98);
+}
+.badge {
+  display: inline-block;
+  padding: 0.15rem 0.5rem;
+  font-size: 0.7rem;
+  border-radius: 999px;
+  background: var(--color-border);
+  color: var(--color-text-muted);
+}
+.badge-pet {
+  background: var(--color-primary-soft);
+  color: var(--color-primary);
+}
+.postcard--discovery {
+  border: 1px solid var(--color-primary);
+  box-shadow:
+    0 0 0 1px rgba(46, 125, 50, 0.15),
+    var(--shadow-sm);
+}
+.empty-state {
+  padding: var(--space-xl);
+  margin: var(--space-md);
+  text-align: center;
+  background: var(--color-surface);
+  border-radius: var(--radius-lg);
+  border: 1px dashed var(--color-border);
+  color: var(--color-text-secondary);
+}
+
+.empty-state strong {
+  display: block;
+  font-size: 1rem;
+  font-weight: 600;
+  color: var(--color-text-main);
+  margin-bottom: 0.3rem;
+}
+
+.empty-state span {
+  font-size: 0.85rem;
+  line-height: 1.4;
+}
+.empty-state--explore {
+  border-style: solid;
+}
+.empty-state--pets {
+  border-style: dashed;
+}
+
+button:active,
+.button-primary:active {
+  transform: scale(0.98);
+}
+
+a {
+  -webkit-tap-highlight-color: transparent;
+}
+section + section {
+  margin-top: var(--space-xl);
+}
+
+h1, h2, h3 {
+  line-height: 1.25;
+}
+.pet-detail-page {
+  padding-bottom: calc(var(--space-xl) + 60px); /* Platz für BottomNav */
+}
+.pet-detail-header {
+  display: flex;
+  gap: var(--space-lg);
+  padding: var(--space-lg);
+  margin: var(--space-md);
+  background: var(--color-surface);
+  border-radius: var(--radius-lg);
+  border: 1px solid var(--color-border);
+  box-shadow: var(--shadow-sm);
+  align-items: center;
+}
+.pet-detail-avatar {
+  width: 72px;
+  height: 72px;
+  border-radius: 50%;
+  background: var(--color-primary-soft);
+  display: flex;
+  align-items: center;
+  justify-content: center;
+  font-size: 2rem;
+  flex-shrink: 0;
+}
+.pet-detail-info h1 {
+  font-size: 1.4rem;
+  margin: 0;
+}
+
+.pet-detail-meta {
+  display: block;
+  font-size: 0.9rem;
+  color: var(--color-text-secondary);
+  margin-top: 0.2rem;
+}
+
+.pet-detail-owner {
+  display: block;
+  font-size: 0.8rem;
+  color: var(--color-text-muted);
+  margin-top: 0.3rem;
+}
+.pet-detail-posts {
+  margin-top: var(--space-xl);
+}
+
+.pet-detail-posts h2 {
+  font-size: 1.1rem;
+  margin: 0 var(--space-md) var(--space-sm);
+}
+
+.container {
+  max-width: 720px;
+  margin: 0 auto;
+}
+.divider {
+  height: 1px;
+  background: var(--color-border);
+  margin: var(--space-lg) 0;
+}
+button:disabled,
+.button-primary:disabled,
+.button-secondary:disabled,
+.button-danger:disabled {
+  opacity: 0.55;
+  cursor: not-allowed;
+  box-shadow: none;
+  transform: none;
+}
+.button-primary.is-loading,
+.button-secondary.is-loading,
+.button-danger.is-loading {
+  position: relative;
+  pointer-events: none;
+  color: transparent; /* Text ausblenden */
+}
+.button-primary.is-loading::after,
+.button-secondary.is-loading::after,
+.button-danger.is-loading::after {
+  content: '';
+  width: 16px;
+  height: 16px;
+  border: 2px solid rgba(255, 255, 255, 0.4);
+  border-top-color: white;
+  border-radius: 50%;
+  position: absolute;
+  animation: spin 0.8s linear infinite;
+}
+select {
+  appearance: none;
+  -webkit-appearance: none;
+  -moz-appearance: none;
+
+  width: 100%;
+  padding: 0.7rem 2.4rem 0.7rem 0.9rem;
+  border-radius: var(--radius-lg);
+  border: 1px solid var(--color-border);
+  background-color: var(--color-surface);
+  color: var(--color-text-main);
+  font-size: 0.9rem;
+  line-height: 1.3;
+
+  box-shadow: var(--shadow-sm);
+  cursor: pointer;
+
+  background-image: url("data:image/svg+xml,%3Csvg xmlns='http://www.w3.org/2000/svg' width='14' height='14' viewBox='0 0 24 24'%3E%3Cpath fill='%235f6f66' d='M7 10l5 5 5-5z'/%3E%3C/svg%3E");
+  background-repeat: no-repeat;
+  background-position: right 0.9rem center;
+}
+select:focus {
+  outline: none;
+  border-color: var(--color-primary);
+  box-shadow: 0 0 0 2px rgba(46, 125, 50, 0.15);
+}
+select:disabled {
+  background-color: var(--color-primary-soft);
+  color: var(--color-text-muted);
+  cursor: not-allowed;
+}
+.postcard-title-row {
+  display: flex;
+  align-items: center;
+  gap: 0.5rem;
+}
+
+.birthday-dot {
+  margin-left: auto;
+  display: inline-flex;
+  align-items: center;
+  justify-content: center;
+  width: 28px;
+  height: 28px;
+  border-radius: 12px;
+  background: var(--color-primary-soft);
+  border: 1px solid rgba(46, 125, 50, 0.25);
+  box-shadow: var(--shadow-sm);
+  font-size: 0.95rem;
+}
+
+/* Birthday Highlight */
+.postcard--birthday {
+  border-color: rgba(46, 125, 50, 0.35);
+  box-shadow:
+    0 0 0 2px rgba(46, 125, 50, 0.18),
+    var(--shadow-sm);
+}

frontend/app/lib/petAge.ts

@@ -0,0 +1,34 @@
+export function calculatePetAge(birthDate: string) {
+  const today = new Date();
+  const birth = new Date(birthDate);
+
+  let age = today.getFullYear() - birth.getFullYear();
+  const hasHadBirthdayThisYear =
+    today.getMonth() > birth.getMonth() ||
+    (today.getMonth() === birth.getMonth() &&
+      today.getDate() >= birth.getDate());
+
+  if (!hasHadBirthdayThisYear) {
+    age -= 1;
+  }
+
+  return age < 0 ? 0 : age;
+}
+
+export function isBirthdayToday(birthDate: string) {
+  const today = new Date();
+  const birth = new Date(birthDate);
+
+  return (
+    today.getDate() === birth.getDate() &&
+    today.getMonth() === birth.getMonth()
+  );
+}
+
+export function formatPetAge(birthDate: string) {
+  const age = calculatePetAge(birthDate);
+
+  if (age === 0) return 'unter 1 Jahr';
+  if (age === 1) return '1 Jahr';
+  return `${age} Jahre`;
+}

frontend/app/pets/[id]/edit/page.tsx

@@ -1,326 +1,231 @@
 'use client';
 
-import { useState } from 'react';
-import Link from 'next/link';
-import { dogBreeds, catBreeds } from '@/app/data/breeds';
-
-type PetType = 'Hund' | 'Katze';
+import { useEffect, useState } from 'react';
+import { useRouter } from 'next/navigation';
+import {
+  formatPetAge,
+} from '@/app/lib/petAge';
 
+/* Mock – später API */
 type Pet = {
   id: number;
   name: string;
-  type: PetType;
+  type: 'Hund' | 'Katze';
   breed: string;
+  birthDate?: string;
+  gender?: 'Männlich' | 'Weiblich' | 'Unbekannt';
   bio?: string;
+  visibility: 'public' | 'followers';
 };
 
-// 🔧 Mock-Daten (später Backend)
+/* MOCK-DATEN */
 const mockPets: Pet[] = [
   {
     id: 1,
     name: 'Luna',
     type: 'Katze',
-    breed: 'Bengal x Mix',
-    bio: 'Neugierig, verspielt und liebt Sonne.',
-  },
-  {
-    id: 2,
-    name: 'Bello',
-    type: 'Hund',
-    breed: 'Labrador Retriever x Mix',
-    bio: 'Immer gute Laune.',
+    breed: 'Bengal',
+    birthDate: '2021-05-14',
+    gender: 'Weiblich',
+    bio: 'Neugierig und verspielt',
+    visibility: 'public',
   },
 ];
 
-type PageProps = {
-  params: Promise<{ id: string }>;
-};
-
-export default async function EditPetPage({ params }: PageProps) {
-  const { id } = await params;
-  const petId = Number(id);
-
+export default function EditPetPage({
+  params,
+}: {
+  params: { id: string };
+}) {
+  const router = useRouter();
+  const petId = Number(params.id);
   const pet = mockPets.find((p) => p.id === petId);
 
-  if (!pet) {
-    return <p>Haustier nicht gefunden.</p>;
-  }
-
-  return <EditPetForm pet={pet} />;
-}
-
-/* ---------- FORMULAR (Client Component) ---------- */
-
-function EditPetForm({ pet }: { pet: Pet }) {
-  const [name, setName] = useState(pet.name);
-  const [type, setType] = useState<PetType>(pet.type);
-  const [breed, setBreed] = useState(pet.breed);
-  const [breedSearch, setBreedSearch] = useState('');
-  const [bio, setBio] = useState(pet.bio ?? '');
-  const [error, setError] = useState('');
-  const [success, setSuccess] = useState('');
-  const [showDeleteConfirm, setShowDeleteConfirm] = useState(false);
-
-
-  const breeds = type === 'Hund' ? dogBreeds : catBreeds;
-  const filteredBreeds = breeds.filter((b) =>
-    b.toLowerCase().includes(breedSearch.toLowerCase())
+  const [name, setName] = useState('');
+  const [birthDate, setBirthDate] = useState('');
+  const [ageFallback, setAgeFallback] = useState('');
+  const [gender, setGender] = useState<'Männlich' | 'Weiblich' | 'Unbekannt'>(
+    'Unbekannt'
+  );
+  const [bio, setBio] = useState('');
+  const [visibility, setVisibility] = useState<'public' | 'followers'>(
+    'public'
   );
 
-  function handleSubmit(event: React.FormEvent) {
-    event.preventDefault();
+  const [error, setError] = useState('');
+  const [success, setSuccess] = useState('');
+
+  /* Initialwerte setzen */
+  useEffect(() => {
+    if (!pet) return;
+
+    setName(pet.name);
+    setBirthDate(pet.birthDate || '');
+    setGender(pet.gender || 'Unbekannt');
+    setBio(pet.bio || '');
+    setVisibility(pet.visibility);
+  }, [pet]);
+
+  if (!pet) {
+    return (
+      <section className="empty-state">
+        <strong>Haustier nicht gefunden</strong>
+        <span>Bitte gehe zurück zur Übersicht.</span>
+      </section>
+    );
+  }
+
+  function handleSubmit(e: React.FormEvent) {
+    e.preventDefault();
     setError('');
     setSuccess('');
 
     if (!name.trim()) {
-      setError('Name darf nicht leer sein.');
+      setError('Der Name darf nicht leer sein.');
       return;
     }
 
-    if (!breed) {
-      setError('Bitte wähle eine Rasse aus.');
-      return;
-    }
-
-    const updatedPetPayload = {
-      id: pet.id,
+    const updatedPet = {
+      ...pet,
       name,
-      type,
-      breed,
-      bio: bio || null,
-      updatedAt: new Date().toISOString(),
+      birthDate: birthDate || null,
+      ageFallback: birthDate ? null : ageFallback || null,
+      gender,
+      bio,
+      visibility,
     };
 
-    console.log('Haustier aktualisiert (Mock):', updatedPetPayload);
+    console.log('UPDATED PET:', updatedPet);
 
-    setSuccess('Änderungen gespeichert ✅');
+    setSuccess('Änderungen wurden gespeichert.');
+    setTimeout(() => {
+      router.push(`/pets/${pet.id}`);
+    }, 800);
   }
-function handleDelete() {
-  console.log('Haustier gelöscht (Mock):', pet.id);
 
-  // Später:
-  // await fetch(`/api/pets/${pet.id}`, { method: 'DELETE' })
-  // router.push('/pets');
-
-  setShowDeleteConfirm(false);
-  alert('Haustier wurde technisch gelöscht (Mock)');
-}
+  function handleCancel() {
+    router.back();
+  }
 
   return (
-    <section
-      style={{
-        maxWidth: '600px',
-        margin: '0 auto',
-        display: 'grid',
-        gap: '1.5rem',
-      }}
-    >
-      <header>
+    <section className="pets-page">
+      <header className="pets-header">
         <h1>Haustier bearbeiten</h1>
-        <p style={{ color: '#555' }}>
-          Passe die Informationen deines Haustiers an.
-        </p>
+        <p>Du kannst die Angaben jederzeit korrigieren.</p>
       </header>
 
-      <form
-        onSubmit={handleSubmit}
-        style={{
-          border: '1px solid #e5e5e5',
-          borderRadius: '16px',
-          padding: '1rem',
-          display: 'grid',
-          gap: '1rem',
-          backgroundColor: 'white',
-        }}
-      >
+      <form className="pet-form" onSubmit={handleSubmit}>
         {/* Name */}
-        <div style={{ display: 'grid', gap: '0.4rem' }}>
-          <strong>Name</strong>
-          <input
-            value={name}
-            onChange={(e) => setName(e.target.value)}
-            style={{
-              padding: '0.7rem',
-              borderRadius: '10px',
-              border: '1px solid #ccc',
-            }}
-          />
+        <div className="form-group">
+          <label>
+            Name <span className="required">*</span>
+          </label>
+          <input value={name} onChange={(e) => setName(e.target.value)} />
         </div>
 
-        {/* Art */}
-        <div style={{ display: 'grid', gap: '0.4rem' }}>
-          <strong>Tier-Art</strong>
-          <select
-            value={type}
+        {/* Art & Rasse (read-only) */}
+        <div className="form-group">
+          <label>Tier-Art</label>
+          <input value={pet.type} disabled />
+          <small>Kann nachträglich nicht geändert werden.</small>
+        </div>
+
+        <div className="form-group">
+          <label>Rasse</label>
+          <input value={pet.breed} disabled />
+          <small>Kann nachträglich nicht geändert werden.</small>
+        </div>
+
+        {/* Geburtsdatum */}
+        <div className="form-group">
+          <label>Geburtsdatum</label>
+          <input
+            type="date"
+            value={birthDate}
             onChange={(e) => {
-              setType(e.target.value as PetType);
-              setBreed('');
-              setBreedSearch('');
-            }}
-            style={{
-              padding: '0.6rem',
-              borderRadius: '10px',
-              border: '1px solid #ccc',
-              maxWidth: '220px',
-            }}
-          >
-            <option value="Katze">Katze</option>
-            <option value="Hund">Hund</option>
-          </select>
-        </div>
-
-        {/* Rasse */}
-        <div style={{ display: 'grid', gap: '0.5rem' }}>
-          <strong>Rasse</strong>
-
-          <input
-            placeholder="Rasse suchen …"
-            value={breedSearch}
-            onChange={(e) => setBreedSearch(e.target.value)}
-            style={{
-              padding: '0.6rem',
-              borderRadius: '10px',
-              border: '1px solid #ccc',
+              setBirthDate(e.target.value);
+              if (e.target.value) setAgeFallback('');
             }}
           />
+          {birthDate && (
+            <small>
+              Aktuelles Alter: <strong>{formatPetAge(birthDate)}</strong>
+            </small>
+          )}
+        </div>
 
+        {/* Fallback-Alter */}
+        {!birthDate && (
+          <div className="form-group">
+            <label>Alter (geschätzt)</label>
+            <input
+              type="number"
+              min={0}
+              max={30}
+              value={ageFallback}
+              onChange={(e) => setAgeFallback(e.target.value)}
+            />
+            <small>Wird verwendet, wenn kein Geburtsdatum bekannt ist.</small>
+          </div>
+        )}
+
+        {/* Geschlecht */}
+        <div className="form-group">
+          <label>Geschlecht</label>
           <select
-            value={breed}
-            onChange={(e) => setBreed(e.target.value)}
-            size={Math.min(filteredBreeds.length, 6)}
-            style={{
-              padding: '0.6rem',
-              borderRadius: '10px',
-              border: '1px solid #ccc',
-            }}
+            value={gender}
+            onChange={(e) =>
+              setGender(e.target.value as 'Männlich' | 'Weiblich' | 'Unbekannt')
+            }
           >
-            {filteredBreeds.map((b) => (
-              <option key={b} value={b}>
-                {b}
-              </option>
-            ))}
+            <option value="Unbekannt">Unbekannt</option>
+            <option value="Männlich">Männlich</option>
+            <option value="Weiblich">Weiblich</option>
           </select>
         </div>
 
         {/* Bio */}
-        <div style={{ display: 'grid', gap: '0.4rem' }}>
-          <strong>Kurzbeschreibung</strong>
+        <div className="form-group">
+          <label>Kurzbeschreibung</label>
           <textarea
+            rows={3}
             value={bio}
             onChange={(e) => setBio(e.target.value)}
-            rows={3}
-            style={{
-              padding: '0.8rem',
-              borderRadius: '12px',
-              border: '1px solid #ccc',
-            }}
           />
         </div>
 
+        {/* Sichtbarkeit */}
+        <div className="form-group">
+          <label>Sichtbarkeit</label>
+          <select
+            value={visibility}
+            onChange={(e) =>
+              setVisibility(e.target.value as 'public' | 'followers')
+            }
+          >
+            <option value="public">Öffentlich</option>
+            <option value="followers">Nur für Abonnenten</option>
+          </select>
+        </div>
+
         {/* Meldungen */}
-        {error && <div style={{ background: '#f8d7da', padding: '0.7rem' }}>{error}</div>}
-        {success && <div style={{ background: '#d1e7dd', padding: '0.7rem' }}>{success}</div>}
+        {error && <div className="form-error">{error}</div>}
+        {success && <div className="form-success">{success}</div>}
 
         {/* Aktionen */}
-        <div style={{ display: 'flex', gap: '0.8rem' }}>
-          <button
-            type="submit"
-            style={{
-              padding: '0.8rem 1.2rem',
-              borderRadius: '12px',
-              border: 'none',
-              backgroundColor: '#2E7D32',
-              color: 'white',
-              fontWeight: 700,
-            }}
-          >
+        <div className="form-actions">
+          <button type="submit" className="button-primary">
             Änderungen speichern
           </button>
-
-          <Link href={`/pets/${pet.id}`}>Abbrechen</Link>
-          <hr style={{ margin: '1rem 0', borderColor: '#eee' }} />
-
-<button
-  type="button"
-  onClick={() => setShowDeleteConfirm(true)}
-  style={{
-    padding: '0.7rem 1.2rem',
-    borderRadius: '12px',
-    border: '1px solid #d32f2f',
-    backgroundColor: 'white',
-    color: '#d32f2f',
-    fontWeight: 700,
-    cursor: 'pointer',
-  }}
->
-  Haustier löschen
-</button>
-
+          <button
+            type="button"
+            className="button-danger"
+            onClick={handleCancel}
+          >
+            Abbrechen
+          </button>
         </div>
       </form>
-      {showDeleteConfirm && (
-  <div
-    style={{
-      position: 'fixed',
-      inset: 0,
-      backgroundColor: 'rgba(0,0,0,0.5)',
-      display: 'flex',
-      alignItems: 'center',
-      justifyContent: 'center',
-      zIndex: 1000,
-    }}
-  >
-    <div
-      style={{
-        backgroundColor: 'white',
-        borderRadius: '16px',
-        padding: '1.2rem',
-        maxWidth: '420px',
-        width: '100%',
-        display: 'grid',
-        gap: '1rem',
-      }}
-    >
-      <h3>Haustier wirklich löschen?</h3>
-
-      <p style={{ color: '#555' }}>
-        Alle Beiträge dieses Haustiers gehen dabei verloren.
-        Diese Aktion kann nicht rückgängig gemacht werden. Bist du dir sicher?
-      </p>
-
-      <div style={{ display: 'flex', gap: '0.8rem', justifyContent: 'flex-end' }}>
-        <button
-          onClick={() => setShowDeleteConfirm(false)}
-          style={{
-            padding: '0.6rem 1rem',
-            borderRadius: '10px',
-            border: '1px solid #ccc',
-            backgroundColor: 'white',
-            cursor: 'pointer',
-          }}
-        >
-          Abbrechen
-        </button>
-
-        <button
-          onClick={handleDelete}
-          style={{
-            padding: '0.6rem 1rem',
-            borderRadius: '10px',
-            border: 'none',
-            backgroundColor: '#d32f2f',
-            color: 'white',
-            fontWeight: 700,
-            cursor: 'pointer',
-          }}
-        >
-          Löschen
-        </button>
-      </div>
-    </div>
-  </div>
-)}
-
     </section>
   );
 }

frontend/app/pets/[id]/page.tsx

@@ -1,27 +1,30 @@
+'use client';
+
+import { useParams } from 'next/navigation';
 import PostCard from '@/app/components/PostCard/PostCard';
+import {calculatePetAge, formatPetAge, isBirthdayToday,} from '@/app/lib/petAge';
 
-type Comment = {
-  id: number;
-  author: string;
-  text: string;
-};
 
-type PetPost = {
-  id: number;
-  text: string;
-  createdAt: string;
-  likes: number;
-  commentsCount: number;
-  commentsList: Comment[];
-};
 
 type Pet = {
   id: number;
   name: string;
   type: 'Hund' | 'Katze';
   breed: string;
-  bio?: string;
-  posts: PetPost[];
+  age?: string;
+  owner: string;
+};
+
+type Post = {
+  id: number;
+  petId: number;
+  petName: string;
+  petType: 'Hund' | 'Katze';
+  author: string;
+  text: string;
+  createdAt: string;
+  likes: number;
+  comments: number;
 };
 
 const mockPets: Pet[] = [
@@ -29,76 +32,108 @@ const mockPets: Pet[] = [
     id: 1,
     name: 'Luna',
     type: 'Katze',
-    breed: 'Bengal x Mix',
-    bio: 'Neugierig, verspielt und liebt Sonne.',
-    posts: [
-      {
-        id: 101,
-        text: 'Luna genießt die Sonne ☀️',
-        createdAt: 'vor 2 Stunden',
-        likes: 12,
-        commentsCount: 2,
-        commentsList: [
-          { id: 1, author: 'Lisa', text: 'Wie süß 😍' },
-          { id: 2, author: 'Tom', text: 'Typisch Bengal!' },
-        ],
-      },
-    ],
+    breed: 'Bengal',
+    age: '2 Jahre',
+    owner: 'Anna',
+    birthDate: '2021-06-15',
   },
   {
     id: 2,
     name: 'Bello',
     type: 'Hund',
-    breed: 'Labrador Retriever x Mix',
-    bio: 'Immer gute Laune.',
-    posts: [],
+    breed: 'Labrador',
+    age: '4 Jahre',
+    owner: 'Markus',
+    birthDate: '2020-03-22',
   },
 ];
 
-type PageProps = {
-  params: Promise<{ id: string }>;
-};
+const mockPosts: Post[] = [
+  {
+    id: 101,
+    petId: 1,
+    petName: 'Luna',
+    petType: 'Katze',
+    author: 'Anna',
+    text: 'Luna liebt sonnige Nachmittage auf dem Balkon ☀️',
+    createdAt: 'vor 3 Stunden',
+    likes: 12,
+    comments: 3,
+    
+  },
+  {
+    id: 102,
+    petId: 1,
+    petName: 'Luna',
+    petType: 'Katze',
+    author: 'Anna',
+    text: 'Heute gab es neue Spielsachen 🧶',
+    createdAt: 'gestern',
+    likes: 7,
+    comments: 1,
+    
+  },
+];
 
-export default async function PetDetailPage({ params }: PageProps) {
-  const { id } = await params; // ✅ DAS ist der entscheidende Fix
-  const petId = Number(id);
-
-  console.log('PET ID:', petId);
+export default function PetDetailPage() {
+  const params = useParams();
+  const petId = Number(params.id);
 
   const pet = mockPets.find((p) => p.id === petId);
+  const posts = mockPosts.filter((p) => p.petId === petId);
 
   if (!pet) {
-    return <p>Haustier nicht gefunden.</p>;
+    return (
+      <div className="empty-state">
+        <strong>Tier nicht gefunden</strong>
+        <span>Dieses Haustier existiert nicht oder wurde entfernt.</span>
+      </div>
+    );
   }
 
   return (
-    <section style={{ maxWidth: '600px', margin: '0 auto', display: 'grid', gap: '1.5rem' }}>
-      <header style={{ border: '1px solid #e5e5e5', borderRadius: '16px', padding: '1rem' }}>
-        <h1>{pet.name}</h1>
-        <div>{pet.type} · {pet.breed}</div>
-        {pet.bio && <p>{pet.bio}</p>}
+    <section className="pet-detail-page">
+      {/* Header */}
+      <header className="pet-detail-header">
+        <div className="pet-detail-avatar">🐾</div>
+
+        <div className="pet-detail-info">
+          <h1>{pet.name}</h1>
+
+          <span className="pet-detail-meta">
+  {pet.type} · {pet.breed}
+  {pet.birthDate && ` · ${formatPetAge(pet.birthDate)}`}
+</span>
+
+
+          <span className="pet-detail-owner">
+            Betreut von {pet.owner}
+          </span>
+        </div>
       </header>
 
-      <section style={{ display: 'grid', gap: '1.2rem' }}>
+      {/* Posts */}
+      <section className="pet-detail-posts">
         <h2>Beiträge</h2>
 
-        {pet.posts.length === 0 && (
-          <p style={{ color: '#777' }}>Dieses Haustier hat noch keine Beiträge.</p>
+        {posts.length === 0 ? (
+          <div className="empty-state">
+            <strong>Noch keine Beiträge</strong>
+            <span>
+              Für {pet.name} wurden noch keine Beiträge erstellt.
+            </span>
+          </div>
+        ) : (
+          <div className="post-list">
+            {posts.map((post) => (
+              <PostCard
+                key={post.id}
+                post={post}
+                isDiscovery={false}
+              />
+            ))}
+          </div>
         )}
-
-        {pet.posts.map((post) => (
-          <PostCard
-            key={post.id}
-            petName={pet.name}
-            petType={pet.type}
-            author="Du"
-            text={post.text}
-            createdAt={post.createdAt}
-            likes={post.likes}
-            commentsCount={post.commentsCount}
-            commentsList={post.commentsList}
-          />
-        ))}
       </section>
     </section>
   );

frontend/app/pets/new/page.tsx

@@ -2,37 +2,43 @@
 
 import { useState } from 'react';
 import Link from 'next/link';
+import { useRouter } from 'next/navigation';
 import { dogBreeds, catBreeds } from '@/app/data/breeds';
 
 type PetType = 'Hund' | 'Katze' | '';
 
 export default function NewPetPage() {
+  const router = useRouter();
+
+  // Pflichtfelder
   const [name, setName] = useState('');
   const [type, setType] = useState<PetType>('');
   const [breed, setBreed] = useState('');
-  const [breedSearch, setBreedSearch] = useState('');
+
+  // Erweiterte Felder
+  const [birthDate, setBirthDate] = useState('');
+  const [ageFallback, setAgeFallback] = useState('');
+  const [gender, setGender] = useState<'Männlich' | 'Weiblich' | 'Unbekannt'>(
+    'Unbekannt'
+  );
   const [bio, setBio] = useState('');
+  const [visibility, setVisibility] = useState<'public' | 'followers'>(
+    'public'
+  );
+
+  // UX States
   const [error, setError] = useState('');
   const [success, setSuccess] = useState('');
 
-  const breeds =
-    type === 'Hund'
-      ? dogBreeds
-      : type === 'Katze'
-      ? catBreeds
-      : [];
+  const breeds = type === 'Hund' ? dogBreeds : catBreeds;
 
-  const filteredBreeds = breeds.filter((b) =>
-    b.toLowerCase().includes(breedSearch.toLowerCase())
-  );
-
-  function handleSubmit(event: React.FormEvent) {
-    event.preventDefault();
+  function handleSubmit(e: React.FormEvent) {
+    e.preventDefault();
     setError('');
     setSuccess('');
 
     if (!name.trim()) {
-      setError('Bitte gib einen Namen für dein Haustier ein.');
+      setError('Bitte gib einen Namen für dein Tier an.');
       return;
     }
 
@@ -42,120 +48,80 @@ export default function NewPetPage() {
     }
 
     if (!breed) {
-      setError('Bitte wähle eine Rasse aus.');
+      setError('Bitte wähle eine Rasse oder „Mix“ aus.');
       return;
     }
 
-    const newPetPayload = {
+    const petPayload = {
       name,
       type,
       breed,
-      bio: bio || null,
-      createdAt: new Date().toISOString(),
+      birthDate: birthDate || null,
+      ageFallback: birthDate ? null : ageFallback || null,
+      gender,
+      bio,
+      visibility,
     };
 
-    console.log('Neues Haustier (Mock):', newPetPayload);
+    console.log('NEW PET:', petPayload);
 
-    setSuccess('Haustier wurde technisch angelegt ✅');
-    setName('');
-    setType('');
-    setBreed('');
-    setBreedSearch('');
-    setBio('');
+    setSuccess('Haustier wurde erfolgreich angelegt.');
+    setTimeout(() => {
+      router.push('/pets');
+    }, 800);
+  }
+
+  function handleCancel() {
+    router.back();
   }
 
   return (
-    <section
-      style={{
-        maxWidth: '600px',
-        margin: '0 auto',
-        display: 'grid',
-        gap: '1.5rem',
-      }}
-    >
-      <header>
-        <h1 style={{ marginBottom: '0.5rem' }}>Haustier hinzufügen</h1>
-        <p style={{ margin: 0, color: '#555' }}>
-          Lege ein neues Haustier für dein Profil an.
-        </p>
+    <section className="pets-page">
+      <header className="pets-header">
+        <h1>Haustier hinzufügen</h1>
+        <p>Lege ein neues Tier für dein Profil an.</p>
       </header>
 
-      <form
-        onSubmit={handleSubmit}
-        style={{
-          border: '1px solid #e5e5e5',
-          borderRadius: '16px',
-          padding: '1rem',
-          display: 'grid',
-          gap: '1rem',
-          backgroundColor: 'white',
-        }}
-      >
+      <form className="pet-form" onSubmit={handleSubmit}>
         {/* Name */}
-        <div style={{ display: 'grid', gap: '0.4rem' }}>
-          <strong>Name</strong>
+        <div className="form-group">
+          <label>
+            Name <span className="required">*</span>
+          </label>
           <input
             value={name}
             onChange={(e) => setName(e.target.value)}
             placeholder="z. B. Luna"
-            style={{
-              padding: '0.7rem',
-              borderRadius: '10px',
-              border: '1px solid #ccc',
-            }}
           />
         </div>
 
-        {/* Art */}
-        <div style={{ display: 'grid', gap: '0.4rem' }}>
-          <strong>Tier-Art</strong>
+        {/* Tier-Art */}
+        <div className="form-group">
+          <label>
+            Tier-Art <span className="required">*</span>
+          </label>
           <select
             value={type}
             onChange={(e) => {
               setType(e.target.value as PetType);
               setBreed('');
-              setBreedSearch('');
-            }}
-            style={{
-              padding: '0.6rem',
-              borderRadius: '10px',
-              border: '1px solid #ccc',
-              maxWidth: '220px',
             }}
           >
             <option value="">Bitte auswählen</option>
-            <option value="Katze">Katze</option>
             <option value="Hund">Hund</option>
+            <option value="Katze">Katze</option>
           </select>
         </div>
 
         {/* Rasse */}
         {type && (
-          <div style={{ display: 'grid', gap: '0.5rem' }}>
-            <strong>Rasse</strong>
-
-            <input
-              placeholder="Rasse suchen …"
-              value={breedSearch}
-              onChange={(e) => setBreedSearch(e.target.value)}
-              style={{
-                padding: '0.6rem',
-                borderRadius: '10px',
-                border: '1px solid #ccc',
-              }}
-            />
-
-            <select
-              value={breed}
-              onChange={(e) => setBreed(e.target.value)}
-              size={Math.min(filteredBreeds.length, 6)}
-              style={{
-                padding: '0.6rem',
-                borderRadius: '10px',
-                border: '1px solid #ccc',
-              }}
-            >
-              {filteredBreeds.map((b) => (
+          <div className="form-group">
+            <label>
+              Rasse <span className="required">*</span>
+            </label>
+            <select value={breed} onChange={(e) => setBreed(e.target.value)}>
+              <option value="">Bitte auswählen</option>
+              {breeds.map((b) => (
                 <option key={b} value={b}>
                   {b}
                 </option>
@@ -164,51 +130,94 @@ export default function NewPetPage() {
           </div>
         )}
 
+        {/* Geburtsdatum */}
+        <div className="form-group">
+          <label>Geburtsdatum (optional)</label>
+          <input
+            type="date"
+            value={birthDate}
+            onChange={(e) => {
+              setBirthDate(e.target.value);
+              if (e.target.value) setAgeFallback('');
+            }}
+          />
+          <small>
+            Wenn bekannt – das Alter wird automatisch berechnet.
+          </small>
+        </div>
+
+        {/* Fallback Alter */}
+        {!birthDate && (
+          <div className="form-group">
+            <label>Alter (geschätzt)</label>
+            <input
+              type="number"
+              min={0}
+              max={30}
+              value={ageFallback}
+              onChange={(e) => setAgeFallback(e.target.value)}
+              placeholder="z. B. 3"
+            />
+            <small>Optional – eine grobe Angabe reicht.</small>
+          </div>
+        )}
+
+        {/* Geschlecht */}
+        <div className="form-group">
+          <label>Geschlecht</label>
+          <select
+            value={gender}
+            onChange={(e) =>
+              setGender(e.target.value as 'Männlich' | 'Weiblich' | 'Unbekannt')
+            }
+          >
+            <option value="Unbekannt">Unbekannt</option>
+            <option value="Männlich">Männlich</option>
+            <option value="Weiblich">Weiblich</option>
+          </select>
+        </div>
+
         {/* Bio */}
-        <div style={{ display: 'grid', gap: '0.4rem' }}>
-          <strong>Kurzbeschreibung (optional)</strong>
+        <div className="form-group">
+          <label>Kurzbeschreibung</label>
           <textarea
+            rows={3}
             value={bio}
             onChange={(e) => setBio(e.target.value)}
-            placeholder="Alter, Charakter, Besonderheiten …"
-            rows={3}
-            style={{
-              padding: '0.8rem',
-              borderRadius: '12px',
-              border: '1px solid #ccc',
-            }}
+            placeholder="Charakter, Besonderheiten, Alter …"
           />
         </div>
 
+        {/* Sichtbarkeit */}
+        <div className="form-group">
+          <label>Sichtbarkeit</label>
+          <select
+            value={visibility}
+            onChange={(e) =>
+              setVisibility(e.target.value as 'public' | 'followers')
+            }
+          >
+            <option value="public">Öffentlich</option>
+            <option value="followers">Nur für Abonnenten</option>
+          </select>
+        </div>
+
         {/* Meldungen */}
-        {error && (
-          <div style={{ background: '#f8d7da', padding: '0.7rem' }}>
-            {error}
-          </div>
-        )}
-        {success && (
-          <div style={{ background: '#d1e7dd', padding: '0.7rem' }}>
-            {success}
-          </div>
-        )}
+        {error && <div className="form-error">{error}</div>}
+        {success && <div className="form-success">{success}</div>}
 
         {/* Aktionen */}
-        <div style={{ display: 'flex', gap: '0.8rem' }}>
-          <button
-            type="submit"
-            style={{
-              padding: '0.8rem 1.2rem',
-              borderRadius: '12px',
-              border: 'none',
-              backgroundColor: '#2E7D32',
-              color: 'white',
-              fontWeight: 700,
-            }}
-          >
+        <div className="form-actions">
+          <button type="submit" className="button-primary">
             Haustier speichern
           </button>
-
-          <Link href="/pets">Abbrechen</Link>
+          <button
+            type="button"
+            className="button-danger"
+            onClick={handleCancel}
+          >
+            Abbrechen
+          </button>
         </div>
       </form>
     </section>

frontend/app/pets/page.tsx

@@ -1,75 +1,80 @@
+'use client';
+
 import Link from 'next/link';
 
 type Pet = {
   id: number;
   name: string;
   type: 'Hund' | 'Katze';
+  breed: string;
+  age?: string;
 };
 
 const mockPets: Pet[] = [
-  { id: 1, name: 'Luna', type: 'Katze' },
-  { id: 2, name: 'Bello', type: 'Hund' },
+  {
+    id: 1,
+    name: 'Luna',
+    type: 'Katze',
+    breed: 'Bengal',
+    age: '2 Jahre',
+  },
+  {
+    id: 2,
+    name: 'Bello',
+    type: 'Hund',
+    breed: 'Labrador',
+    age: '4 Jahre',
+  },
+  {
+    id: 3,
+    name: 'Milo',
+    type: 'Katze',
+    breed: 'Europäisch Kurzhaar',
+  },
 ];
 
 export default function PetsPage() {
   return (
-    <section
-      style={{
-        maxWidth: '600px',
-        margin: '0 auto',
-        display: 'grid',
-        gap: '1.5rem',
-      }}
-    >
-      <header>
-        <h1 style={{ marginBottom: '0.5rem' }}>Meine Haustiere</h1>
-        <p style={{ margin: 0, color: '#555' }}>
-          Verwalte deine Hunde und Katzen
+    <section className="pets-page">
+      {/* Header */}
+      <header className="pets-header">
+        <h1>Meine Tiere</h1>
+        <p>
+          Verwalte deine Haustiere – Beiträge sind immer einem Tier zugeordnet.
         </p>
       </header>
 
-      <section style={{ display: 'grid', gap: '1rem' }}>
+      {/* Pets Grid */}
+      <div className="pets-grid">
         {mockPets.map((pet) => (
           <Link
             key={pet.id}
             href={`/pets/${pet.id}`}
-            style={{
-              textDecoration: 'none',
-              color: 'inherit',
-              border: '1px solid #e5e5e5',
-              borderRadius: '16px',
-              padding: '1rem',
-              display: 'flex',
-              justifyContent: 'space-between',
-              alignItems: 'center',
-            }}
+            className="pet-card"
           >
-            <div>
-              <strong>{pet.name}</strong>
-              <div style={{ fontSize: '0.9rem', color: '#555' }}>
-                {pet.type}
-              </div>
+            <div className="pet-avatar">
+              🐾
             </div>
 
-            <span style={{ fontSize: '1.2rem' }}>›</span>
+            <strong className="pet-name">{pet.name}</strong>
+
+            <span className="pet-meta">
+              {pet.type} · {pet.breed}
+            </span>
+
+            {pet.age && (
+              <span className="pet-age">{pet.age}</span>
+            )}
           </Link>
         ))}
-      </section>
+      </div>
 
-      <Link
-        href="/pets/new"
-        style={{
-          alignSelf: 'flex-start',
-          padding: '0.7rem 1rem',
-          borderRadius: '12px',
-          backgroundColor: '#2E7D32',
-          color: 'white',
-          textDecoration: 'none',
-          fontWeight: 600,
-        }}
-      >
-        ➕ Haustier hinzufügen
-      </Link>
+      {/* Add Pet */}
+      <div className="pets-actions">
+        <Link href="/pets/new" className="button-primary">
+          + Neues Tier hinzufügen
+        </Link>
+      </div>
     </section>
   );
 }

frontend/app/profile/page.tsx

@@ -1,3 +1,157 @@
+'use client';
+
+import PostCard, {
+  PostCardData,
+} from '@/app/components/PostCard/PostCard';
+
+/* =======================
+   MOCK: USER
+======================= */
+
+const user = {
+  id: 1,
+  name: 'Laura',
+  username: '@laura_pets',
+  bio: 'Liebt Tiere, Natur & ruhige Momente.',
+  stats: {
+    pets: 2,
+    posts: 6,
+    follows: 18,
+  },
+};
+
+/* =======================
+   MOCK: PETS
+======================= */
+
+const pets = [
+  {
+    id: 1,
+    name: 'Nala',
+    type: 'Katze',
+    breed: 'Maine Coon',
+    age: '3 Jahre',
+  },
+  {
+    id: 2,
+    name: 'Rocky',
+    type: 'Hund',
+    breed: 'Labrador',
+    age: '4 Jahre',
+  },
+];
+
+/* =======================
+   MOCK: POSTS
+======================= */
+
+const posts: PostCardData[] = [
+  {
+    id: 501,
+    petName: 'Nala',
+    petType: 'Katze',
+    authorName: 'Laura',
+    createdAt: 'gestern',
+    text: 'Nala beobachtet alles ganz ruhig.',
+    likesCount: 6,
+    commentsCount: 1,
+  },
+  {
+    id: 502,
+    petName: 'Rocky',
+    petType: 'Hund',
+    authorName: 'Laura',
+    createdAt: 'vor 2 Tagen',
+    text: 'Rocky liebt lange Spaziergänge.',
+    likesCount: 9,
+    commentsCount: 2,
+  },
+];
+
+/* =======================
+   PAGE
+======================= */
+
 export default function ProfilePage() {
-  return <h1>Profil</h1>;
+  return (
+    <>
+      {/* ================= USER HEADER ================= */}
+      <section className="profile-header">
+        <div className="profile-avatar">
+          <span>👤</span>
+        </div>
+
+        <div className="profile-info">
+          <h1>{user.name}</h1>
+          <span className="profile-username">
+            {user.username}
+          </span>
+
+          {user.bio && (
+            <p className="profile-bio">
+              {user.bio}
+            </p>
+          )}
+
+          <div className="profile-stats">
+            <div>
+              <strong>{user.stats.pets}</strong>
+              <span>Tiere</span>
+            </div>
+            <div>
+              <strong>{user.stats.posts}</strong>
+              <span>Beiträge</span>
+            </div>
+            <div>
+              <strong>{user.stats.follows}</strong>
+              <span>Abos</span>
+            </div>
+          </div>
+        </div>
+      </section>
+
+      {/* ================= PETS ================= */}
+      <section className="profile-pets">
+        <h2>Meine Tiere</h2>
+
+        <div className="pets-grid">
+          {pets.map((pet) => (
+            <a
+              key={pet.id}
+              href={`/pets/${pet.id}`}
+              className="pet-card"
+            >
+              <div className="pet-avatar">🐾</div>
+
+              <strong className="pet-name">
+                {pet.name}
+              </strong>
+
+              <span className="pet-meta">
+                {pet.type} · {pet.breed}
+              </span>
+
+              <span className="pet-age">
+                {pet.age}
+              </span>
+            </a>
+          ))}
+        </div>
+      </section>
+
+      {/* ================= POSTS ================= */}
+      <section className="profile-posts">
+        <h2>Beiträge</h2>
+
+        <div className="post-list">
+          {posts.map((post) => (
+            <PostCard
+              key={post.id}
+              post={post}
+            />
+          ))}
+        </div>
+      </section>
+    </>
+  );
 }

package-lock.json

@@ -0,0 +1,233 @@
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+}

package.json

@@ -0,0 +1,6 @@
+{
+  "devDependencies": {
+    "ts-node": "^10.9.2",
+    "typescript": "^5.9.3"
+  }
+}