diff --git a/CONTACTS.md b/CONTACTS.md
new file mode 100644
index 0000000..aa8fd92
--- /dev/null
+++ b/CONTACTS.md
@@ -0,0 +1,219 @@
+# Kontaktmodul
+
+## Übersicht
+Das Kontaktmodul verwaltet Firmenkontakte (Debitoren/Kreditoren) mit bis zu 2 Ansprechpartnern pro Firma.
+
+## Entities
+
+### Contact
+Hauptentity für Firmenkontakte mit folgenden Feldern:
+
+**Firmendaten:**
+- `companyName` (Pflicht): Firmenname
+- `companyNumber`: Kundennummer
+- `street`: Straße
+- `zipCode`: PLZ
+- `city`: Ort
+- `country`: Land
+- `phone`: Telefon
+- `fax`: Fax
+- `email`: E-Mail
+- `website`: Website
+- `taxNumber`: Steuernummer
+- `vatNumber`: USt-IdNr.
+
+**Klassifizierung:**
+- `isDebtor`: Ist Debitor (boolean)
+- `isCreditor`: Ist Kreditor (boolean)
+- `isActive`: Ist aktiv (boolean)
+
+**Sonstiges:**
+- `notes`: Notizen (Text)
+- `contactPersons`: Collection von Ansprechpartnern (OneToMany)
+- `createdAt`: Erstellungsdatum
+- `updatedAt`: Änderungsdatum
+
+### ContactPerson
+Ansprechpartner-Entity mit folgenden Feldern:
+
+- `salutation`: Anrede (Herr/Frau/Divers)
+- `title`: Titel (z.B. Dr., Prof.)
+- `firstName` (Pflicht): Vorname
+- `lastName` (Pflicht): Nachname
+- `position`: Position
+- `department`: Abteilung
+- `phone`: Telefon
+- `mobile`: Mobil
+- `email`: E-Mail
+- `isPrimary`: Hauptansprechpartner (boolean)
+
+## API Endpoints
+
+### Kontakte
+- `GET /api/contacts` - Alle Kontakte auflisten
+- `GET /api/contacts/{id}` - Einzelnen Kontakt abrufen
+- `POST /api/contacts` - Neuen Kontakt erstellen (erfordert ROLE_USER)
+- `PUT /api/contacts/{id}` - Kontakt bearbeiten (erfordert ROLE_USER)
+- `DELETE /api/contacts/{id}` - Kontakt löschen (erfordert ROLE_ADMIN)
+
+### Request/Response Format
+
+**Kontakt erstellen/bearbeiten:**
+```json
+{
+  "companyName": "Beispiel GmbH",
+  "companyNumber": "K-12345",
+  "street": "Musterstraße 123",
+  "zipCode": "12345",
+  "city": "Berlin",
+  "country": "Deutschland",
+  "phone": "+49 30 12345678",
+  "fax": "+49 30 12345679",
+  "email": "info@beispiel.de",
+  "website": "https://www.beispiel.de",
+  "taxNumber": "123/456/78901",
+  "vatNumber": "DE123456789",
+  "isDebtor": true,
+  "isCreditor": false,
+  "isActive": true,
+  "notes": "Wichtiger Kunde",
+  "contactPersons": [
+    {
+      "salutation": "Herr",
+      "title": "Dr.",
+      "firstName": "Max",
+      "lastName": "Mustermann",
+      "position": "Geschäftsführer",
+      "department": "Management",
+      "phone": "+49 30 12345680",
+      "mobile": "+49 170 1234567",
+      "email": "max.mustermann@beispiel.de",
+      "isPrimary": true
+    }
+  ]
+}
+```
+
+## Repository-Methoden
+
+### ContactRepository
+
+**findByType(?bool $isDebtor, ?bool $isCreditor): array**
+- Filtert Kontakte nach Typ (Debitor/Kreditor)
+- Gibt nur aktive Kontakte zurück
+- Sortiert nach Firmennamen
+
+**search(string $searchTerm): array**
+- Durchsucht Kontakte nach:
+  - Firmenname
+  - E-Mail
+  - Stadt
+  - Ansprechpartner (Vor-/Nachname, E-Mail)
+
+## Vue.js Komponente
+
+### ContactManagement.vue
+
+**Features:**
+- DataTable mit Pagination (10/25/50 Einträge)
+- Globale Suche über alle Felder
+- Filter nach Typ (Alle/Debitoren/Kreditoren)
+- Sortierung nach Spalten
+- CRUD-Operationen über Dialoge
+- Bis zu 2 Ansprechpartner pro Kontakt
+- Validierung (Pflichtfelder, E-Mail-Format, URL-Format)
+- Responsive Design (mobile + desktop)
+- Toast-Benachrichtigungen für Erfolg/Fehler
+- Bestätigungsdialog beim Löschen
+
+**Verwendete PrimeVue Komponenten:**
+- DataTable, Column
+- Dialog
+- Card
+- Button
+- InputText, Textarea
+- Checkbox, Dropdown
+- Tag
+- Divider
+- IconField, InputIcon
+
+## Berechtigungen
+
+- **ROLE_USER**: Kann Kontakte ansehen, erstellen und bearbeiten
+- **ROLE_ADMIN**: Kann zusätzlich Kontakte löschen
+
+## Navigation
+
+Das Kontaktmodul ist über den Menüpunkt "Kontakte" erreichbar (Route: `/contacts`).
+
+## Datenbank-Tabellen
+
+### contacts
+```sql
+CREATE TABLE contacts (
+    id INT AUTO_INCREMENT PRIMARY KEY,
+    company_name VARCHAR(255) NOT NULL,
+    company_number VARCHAR(50),
+    street TEXT,
+    zip_code VARCHAR(20),
+    city VARCHAR(100),
+    country VARCHAR(100),
+    phone VARCHAR(50),
+    fax VARCHAR(50),
+    email VARCHAR(180),
+    website VARCHAR(255),
+    tax_number VARCHAR(50),
+    vat_number VARCHAR(50),
+    is_debtor TINYINT(1) DEFAULT 0,
+    is_creditor TINYINT(1) DEFAULT 0,
+    is_active TINYINT(1) DEFAULT 1,
+    notes TEXT,
+    created_at DATETIME NOT NULL,
+    updated_at DATETIME,
+    INDEX idx_company_name (company_name),
+    INDEX idx_city (city),
+    INDEX idx_is_debtor (is_debtor),
+    INDEX idx_is_creditor (is_creditor),
+    INDEX idx_is_active (is_active)
+);
+```
+
+### contact_persons
+```sql
+CREATE TABLE contact_persons (
+    id INT AUTO_INCREMENT PRIMARY KEY,
+    contact_id INT NOT NULL,
+    salutation VARCHAR(20),
+    title VARCHAR(100),
+    first_name VARCHAR(100) NOT NULL,
+    last_name VARCHAR(100) NOT NULL,
+    position VARCHAR(100),
+    department VARCHAR(100),
+    phone VARCHAR(50),
+    mobile VARCHAR(50),
+    email VARCHAR(180),
+    is_primary TINYINT(1) DEFAULT 0,
+    FOREIGN KEY (contact_id) REFERENCES contacts(id) ON DELETE CASCADE,
+    INDEX idx_contact_id (contact_id),
+    INDEX idx_is_primary (is_primary)
+);
+```
+
+## Best Practices
+
+1. **Ansprechpartner-Limit**: Maximal 2 Ansprechpartner pro Kontakt (UI-Limitierung)
+2. **Cascade Delete**: Beim Löschen eines Kontakts werden auch alle Ansprechpartner gelöscht
+3. **Timestamps**: Automatische Verwaltung von `createdAt` und `updatedAt`
+4. **Validierung**: Alle Validierungen erfolgen sowohl im Backend (Symfony Validator) als auch im Frontend (Vue.js)
+5. **Session-basierte API**: Alle API-Aufrufe verwenden `credentials: 'include'` für Session-Authentifizierung
+
+## Erweiterungsmöglichkeiten
+
+- Aktivitäten-Tracking (Anrufe, E-Mails, Meetings)
+- Dokumente-Verwaltung
+- Deals/Opportunities
+- Import/Export (CSV, Excel)
+- Duplikatserkennung
+- Kontakt-Historie
+- Tags/Labels
+- Mehr als 2 Ansprechpartner (aktuell UI-limitiert)
diff --git a/README.md b/README.md
index 5f9c043..250ad56 100644
--- a/README.md
+++ b/README.md
@@ -6,13 +6,16 @@ Eine moderne, modulare CRM-Anwendung basierend auf Symfony 7.1 LTS, Vue.js 3 und
 
 - **Symfony 7.1 LTS** - Stabile PHP-Backend-Framework
 - **Vue.js 3** - Modernes, reaktives Frontend mit Composition API
-- **PrimeVue** - Professionelle UI-Komponenten (DataTable, Charts, Forms)
+- **PrimeVue 4** - Professionelle UI-Komponenten (DataTable, Charts, Forms)
+- **Sakai Template** - Professional Admin Layout mit Dark Mode
+- **Tailwind CSS v4** - Utility-First CSS Framework
 - **API Platform** - RESTful API mit OpenAPI-Dokumentation
 - **MariaDB** - Zuverlässige relationale Datenbank
 - **Webpack Encore** - Asset-Management und Hot Module Replacement
 - **Modulares Berechtigungssystem** - Flexible Rollen mit Modul-basierter Rechteverwaltung
 - **User CRUD** - Vollständige Benutzerverwaltung via API Platform
 - **Login-System** - Form-basierte Authentifizierung mit Remember Me
+- **Kontaktmodul** - Firmenstammdaten mit Ansprechpersonen und Debitor/Kreditor-Klassifizierung
 
 ## 📋 Voraussetzungen
 
@@ -101,18 +104,23 @@ npm run watch
 /assets
   /js
     /components    - Wiederverwendbare Vue-Komponenten
-    /views         - Page-Level Vue-Komponenten
+    /views         - Page-Level Vue-Komponenten (ContactManagement, UserManagement, etc.)
+    /layout        - Sakai Layout-Komponenten (AppLayout, AppTopbar, AppSidebar, AppMenu)
     /composables   - Vue Composition API Functions
     /stores        - Pinia State Management
     /api           - API Client Wrapper
-  /styles          - SCSS/CSS Styles
+  /styles
+    /layout        - Sakai SCSS (Topbar, Sidebar, Menu, Footer, Responsive, Animations)
+    tailwind.css   - Tailwind CSS v4 mit PrimeUI Plugin
+    sakai.scss     - Sakai Layout Imports
 /config            - Symfony-Konfiguration
 /src
   /Controller      - HTTP Controllers
-  /Entity          - Doctrine Entities
+  /Entity          - Doctrine Entities (User, Role, Contact, ContactPerson)
   /Repository      - Database Queries
   /Service         - Business Logic
   /Security/Voter  - Permission Logic
+  /DataFixtures    - Test-Daten (200 Kontakte mit realistischen deutschen Daten)
 /templates         - Twig Templates
 /public            - Public Assets & Entry Point
 /migrations        - Doctrine Migrations
@@ -131,7 +139,9 @@ npm run watch
 - **Vue.js 3** - Progressive JavaScript Framework
 - **Vue Router** - SPA Navigation
 - **Pinia** - State Management
-- **PrimeVue** - UI Component Library
+- **PrimeVue 4** - UI Component Library mit Aura Theme
+- **Sakai Template** - Professional Admin Layout (von PrimeFaces)
+- **Tailwind CSS v4** - Utility-First CSS Framework mit PrimeUI Plugin
 - **Webpack Encore** - Asset Bundler
 
 ### Database
@@ -140,11 +150,18 @@ npm run watch
 ## 📱 Module
 
 - **Dashboard** - Übersicht und KPIs
-- **Kontakte** - Kontaktverwaltung mit Status-Tracking (in Entwicklung)
-- **Unternehmen** - Firmendatenbank (in Entwicklung)
+- **Kontakte** - Firmenstammdatenverwaltung mit Ansprechpersonen (✅ implementiert)
+  - Vollständige CRUD-Operationen via API Platform
+  - Server-seitige Filterung (Debitoren/Kreditoren/Status)
+  - 200 Test-Fixtures mit realistischen deutschen Firmendaten
+  - Strukturiertes Formular in 6 Kategorien (Basisdaten, Adresse, Kontaktdaten, Steuerdaten, Ansprechpartner, Notizen)
+  - Bis zu 2 Ansprechpersonen pro Firma
+  - Debitor/Kreditor-Klassifizierung (beide möglich)
+  - Aktiv/Inaktiv-Status
 - **Deals** - Sales-Pipeline Management (in Entwicklung)
 - **Aktivitäten** - Interaktions-Historie (in Entwicklung)
 - **Benutzerverwaltung** - CRUD für User (✅ implementiert)
+- **Rollenverwaltung** - Modulare Berechtigungen (✅ implementiert)
 
 ## 🔐 Sicherheit
 
@@ -197,20 +214,31 @@ Dein Team
 
 ---
 
-**Status:** ✅ Grundsystem implementiert - Ready for CRM-Module!
+**Status:** ✅ Grundsystem + Kontaktmodul implementiert - Ready for weitere CRM-Module!
 
 **Implementiert:**
-- ✅ Projekt-Setup (Symfony 7.1 + Vue.js 3 + PrimeVue)
+- ✅ Projekt-Setup (Symfony 7.1 + Vue.js 3 + PrimeVue 4)
+- ✅ Sakai Template Integration (Professional Admin Layout)
+- ✅ Tailwind CSS v4 mit PrimeUI Plugin
 - ✅ Modulares Berechtigungssystem (User, Role, Module, RolePermission)
 - ✅ Login-System mit Remember Me
 - ✅ User-CRUD mit API Platform
+- ✅ **Kontaktmodul mit Firmenstammdaten**
+  - Contact & ContactPerson Entities
+  - API Platform REST Endpoints mit Filtern
+  - Vue.js ContactManagement Component
+  - Strukturiertes Formular (6 Kategorien)
+  - 200 Test-Fixtures mit deutschen Daten
+  - Server-seitige Filterung & Pagination
 - ✅ Vue.js Frontend mit PrimeVue DataTable, Dialogs, Forms
 - ✅ Password-Hashing via State Processor
-- ✅ Admin-Navigation und Schutz
+- ✅ Dark Mode Support
+- ✅ Responsive Design mit Sakai Layout
 
 **Next Steps:**
-1. Contact-Entity erstellen: `php bin/console make:entity Contact`
-2. Company-Entity erstellen: `php bin/console make:entity Company`
-3. Deal-Entity mit Pipeline-Stages erstellen
-4. Activity-Entity für Interaktionshistorie
-5. Vue.js-Komponenten für Contact/Company/Deal-Management
+1. Deal-Entity mit Pipeline-Stages erstellen
+2. Activity-Entity für Interaktionshistorie
+3. Dashboard mit KPIs und Charts
+4. Reporting-Modul
+5. E-Mail-Integration
+6. Kalender/Termine
diff --git a/assets/app.js b/assets/app.js
index 7d3b5d9..e206373 100644
--- a/assets/app.js
+++ b/assets/app.js
@@ -5,14 +5,20 @@ import './bootstrap.js';
  * This file will be included onto the page via the importmap() Twig function,
  * which should already be in your base.html.twig.
  */
-import './styles/app.scss';
+import './styles/tailwind.css';
+import './styles/sakai.scss';
 
 import { createApp } from 'vue';
 import { createPinia } from 'pinia';
 import PrimeVue from 'primevue/config';
 import Aura from '@primevue/themes/aura';
+import Lara from '@primevue/themes/lara';
+import Nora from '@primevue/themes/nora';
+import { $t, updatePreset, updateSurfacePalette } from '@primeuix/themes';
 import ToastService from 'primevue/toastservice';
+import Toast from 'primevue/toast';
 import Tooltip from 'primevue/tooltip';
+import StyleClass from 'primevue/styleclass';
 import router from './js/router';
 import App from './js/App.vue';
 import { useAuthStore } from './js/stores/auth';
@@ -25,22 +31,115 @@ console.log('This log comes from assets/app.js - welcome to myCRM!');
 const app = createApp(App);
 const pinia = createPinia();
 
+// Load saved theme preferences
+const savedPreset = localStorage.getItem('preset') || 'Aura';
+const savedPrimary = localStorage.getItem('primaryColor') || 'emerald';
+const savedSurface = localStorage.getItem('surfaceColor');
+
+const presets = { Aura, Lara, Nora };
+const primaryColors = {
+    noir: {},
+    emerald: { 50: '#ecfdf5', 100: '#d1fae5', 200: '#a7f3d0', 300: '#6ee7b7', 400: '#34d399', 500: '#10b981', 600: '#059669', 700: '#047857', 800: '#065f46', 900: '#064e3b', 950: '#022c22' },
+    green: { 50: '#f0fdf4', 100: '#dcfce7', 200: '#bbf7d0', 300: '#86efac', 400: '#4ade80', 500: '#22c55e', 600: '#16a34a', 700: '#15803d', 800: '#166534', 900: '#14532d', 950: '#052e16' },
+    lime: { 50: '#f7fee7', 100: '#ecfccb', 200: '#d9f99d', 300: '#bef264', 400: '#a3e635', 500: '#84cc16', 600: '#65a30d', 700: '#4d7c0f', 800: '#3f6212', 900: '#365314', 950: '#1a2e05' },
+    orange: { 50: '#fff7ed', 100: '#ffedd5', 200: '#fed7aa', 300: '#fdba74', 400: '#fb923c', 500: '#f97316', 600: '#ea580c', 700: '#c2410c', 800: '#9a3412', 900: '#7c2d12', 950: '#431407' },
+    amber: { 50: '#fffbeb', 100: '#fef3c7', 200: '#fde68a', 300: '#fcd34d', 400: '#fbbf24', 500: '#f59e0b', 600: '#d97706', 700: '#b45309', 800: '#92400e', 900: '#78350f', 950: '#451a03' },
+    yellow: { 50: '#fefce8', 100: '#fef9c3', 200: '#fef08a', 300: '#fde047', 400: '#facc15', 500: '#eab308', 600: '#ca8a04', 700: '#a16207', 800: '#854d0e', 900: '#713f12', 950: '#422006' },
+    teal: { 50: '#f0fdfa', 100: '#ccfbf1', 200: '#99f6e4', 300: '#5eead4', 400: '#2dd4bf', 500: '#14b8a6', 600: '#0d9488', 700: '#0f766e', 800: '#115e59', 900: '#134e4a', 950: '#042f2e' },
+    cyan: { 50: '#ecfeff', 100: '#cffafe', 200: '#a5f3fc', 300: '#67e8f9', 400: '#22d3ee', 500: '#06b6d4', 600: '#0891b2', 700: '#0e7490', 800: '#155e75', 900: '#164e63', 950: '#083344' },
+    sky: { 50: '#f0f9ff', 100: '#e0f2fe', 200: '#bae6fd', 300: '#7dd3fc', 400: '#38bdf8', 500: '#0ea5e9', 600: '#0284c7', 700: '#0369a1', 800: '#075985', 900: '#0c4a6e', 950: '#082f49' },
+    blue: { 50: '#eff6ff', 100: '#dbeafe', 200: '#bfdbfe', 300: '#93c5fd', 400: '#60a5fa', 500: '#3b82f6', 600: '#2563eb', 700: '#1d4ed8', 800: '#1e40af', 900: '#1e3a8a', 950: '#172554' },
+    indigo: { 50: '#eef2ff', 100: '#e0e7ff', 200: '#c7d2fe', 300: '#a5b4fc', 400: '#818cf8', 500: '#6366f1', 600: '#4f46e5', 700: '#4338ca', 800: '#3730a3', 900: '#312e81', 950: '#1e1b4b' },
+    violet: { 50: '#f5f3ff', 100: '#ede9fe', 200: '#ddd6fe', 300: '#c4b5fd', 400: '#a78bfa', 500: '#8b5cf6', 600: '#7c3aed', 700: '#6d28d9', 800: '#5b21b6', 900: '#4c1d95', 950: '#2e1065' },
+    purple: { 50: '#faf5ff', 100: '#f3e8ff', 200: '#e9d5ff', 300: '#d8b4fe', 400: '#c084fc', 500: '#a855f7', 600: '#9333ea', 700: '#7e22ce', 800: '#6b21a8', 900: '#581c87', 950: '#3b0764' },
+    fuchsia: { 50: '#fdf4ff', 100: '#fae8ff', 200: '#f5d0fe', 300: '#f0abfc', 400: '#e879f9', 500: '#d946ef', 600: '#c026d3', 700: '#a21caf', 800: '#86198f', 900: '#701a75', 950: '#4a044e' },
+    pink: { 50: '#fdf2f8', 100: '#fce7f3', 200: '#fbcfe8', 300: '#f9a8d4', 400: '#f472b6', 500: '#ec4899', 600: '#db2777', 700: '#be185d', 800: '#9d174d', 900: '#831843', 950: '#500724' },
+    rose: { 50: '#fff1f2', 100: '#ffe4e6', 200: '#fecdd3', 300: '#fda4af', 400: '#fb7185', 500: '#f43f5e', 600: '#e11d48', 700: '#be123c', 800: '#9f1239', 900: '#881337', 950: '#4c0519' }
+};
+
+const surfaces = {
+    slate: { 0: '#ffffff', 50: '#f8fafc', 100: '#f1f5f9', 200: '#e2e8f0', 300: '#cbd5e1', 400: '#94a3b8', 500: '#64748b', 600: '#475569', 700: '#334155', 800: '#1e293b', 900: '#0f172a', 950: '#020617' },
+    gray: { 0: '#ffffff', 50: '#f9fafb', 100: '#f3f4f6', 200: '#e5e7eb', 300: '#d1d5db', 400: '#9ca3af', 500: '#6b7280', 600: '#4b5563', 700: '#374151', 800: '#1f2937', 900: '#111827', 950: '#030712' },
+    zinc: { 0: '#ffffff', 50: '#fafafa', 100: '#f4f4f5', 200: '#e4e4e7', 300: '#d4d4d8', 400: '#a1a1aa', 500: '#71717a', 600: '#52525b', 700: '#3f3f46', 800: '#27272a', 900: '#18181b', 950: '#09090b' },
+    neutral: { 0: '#ffffff', 50: '#fafafa', 100: '#f5f5f5', 200: '#e5e5e5', 300: '#d4d4d4', 400: '#a3a3a3', 500: '#737373', 600: '#525252', 700: '#404040', 800: '#262626', 900: '#171717', 950: '#0a0a0a' },
+    stone: { 0: '#ffffff', 50: '#fafaf9', 100: '#f5f5f4', 200: '#e7e5e4', 300: '#d6d3d1', 400: '#a8a29e', 500: '#78716c', 600: '#57534e', 700: '#44403c', 800: '#292524', 900: '#1c1917', 950: '#0c0a09' },
+    soho: { 0: '#ffffff', 50: '#f4f4f4', 100: '#e8e9e9', 200: '#d2d2d4', 300: '#bbbcbe', 400: '#a5a5a9', 500: '#8e8f93', 600: '#77787d', 700: '#616268', 800: '#4a4b52', 900: '#34343d', 950: '#1d1e27' },
+    viva: { 0: '#ffffff', 50: '#f3f3f3', 100: '#e7e7e8', 200: '#cfd0d0', 300: '#b7b8b9', 400: '#9fa1a1', 500: '#87898a', 600: '#6e7173', 700: '#565a5b', 800: '#3e4244', 900: '#262b2c', 950: '#0e1315' },
+    ocean: { 0: '#ffffff', 50: '#fbfcfc', 100: '#F7F9F8', 200: '#EFF3F2', 300: '#DADEDD', 400: '#B1B7B6', 500: '#828787', 600: '#5F7274', 700: '#415B61', 800: '#29444E', 900: '#183240', 950: '#0c1920' }
+};
+
+function getPrimaryPreset(primaryName) {
+    const palette = primaryColors[primaryName];
+    
+    if (primaryName === 'noir') {
+        return {
+            semantic: {
+                primary: {
+                    50: '{surface.50}', 100: '{surface.100}', 200: '{surface.200}', 300: '{surface.300}',
+                    400: '{surface.400}', 500: '{surface.500}', 600: '{surface.600}', 700: '{surface.700}',
+                    800: '{surface.800}', 900: '{surface.900}', 950: '{surface.950}'
+                },
+                colorScheme: {
+                    light: {
+                        primary: { color: '{primary.950}', contrastColor: '#ffffff', hoverColor: '{primary.800}', activeColor: '{primary.700}' },
+                        highlight: { background: '{primary.950}', focusBackground: '{primary.700}', color: '#ffffff', focusColor: '#ffffff' }
+                    },
+                    dark: {
+                        primary: { color: '{primary.50}', contrastColor: '{primary.950}', hoverColor: '{primary.200}', activeColor: '{primary.300}' },
+                        highlight: { background: '{primary.50}', focusBackground: '{primary.300}', color: '{primary.950}', focusColor: '{primary.950}' }
+                    }
+                }
+            }
+        };
+    }
+    
+    return {
+        semantic: {
+            primary: palette,
+            colorScheme: {
+                light: {
+                    primary: { color: '{primary.500}', contrastColor: '#ffffff', hoverColor: '{primary.600}', activeColor: '{primary.700}' },
+                    highlight: { background: '{primary.50}', focusBackground: '{primary.100}', color: '{primary.700}', focusColor: '{primary.800}' }
+                },
+                dark: {
+                    primary: { color: '{primary.400}', contrastColor: '{surface.900}', hoverColor: '{primary.300}', activeColor: '{primary.200}' },
+                    highlight: { background: 'color-mix(in srgb, {primary.400}, transparent 84%)', focusBackground: 'color-mix(in srgb, {primary.400}, transparent 76%)', color: 'rgba(255,255,255,.87)', focusColor: 'rgba(255,255,255,.87)' }
+                }
+            }
+        }
+    };
+}
+
 app.use(pinia);
 app.use(router);
 app.use(PrimeVue, {
     theme: {
-        preset: Aura,
+        preset: presets[savedPreset],
         options: {
-            darkModeSelector: false,
+            darkModeSelector: '.app-dark',
             cssLayer: false
         }
     }
 });
 app.use(ToastService);
 app.directive('tooltip', Tooltip);
+app.directive('styleclass', StyleClass);
+app.component('Toast', Toast);
 
 app.mount('#app');
 
+// Apply saved theme colors after mount
+if (savedPrimary || savedSurface) {
+    setTimeout(() => {
+        if (savedPrimary) {
+            updatePreset(getPrimaryPreset(savedPrimary));
+        }
+        if (savedSurface && surfaces[savedSurface]) {
+            updateSurfacePalette(surfaces[savedSurface]);
+        }
+    }, 0);
+}
+
 // Initialize auth store with user data from backend
 const authStore = useAuthStore();
 authStore.initializeFromElement();
diff --git a/assets/js/App.vue b/assets/js/App.vue
index 909cedd..0b30b61 100644
--- a/assets/js/App.vue
+++ b/assets/js/App.vue
@@ -1,100 +1,16 @@
 <template>
   <Toast />
-  <div id="app-layout">
-    <header class="app-header">
-      <div class="header-content">
-        <div class="logo">
-          <i class="pi pi-database"></i>
-          <span>myCRM</span>
-        </div>
-        
-        <button class="hamburger" @click="toggleMobileMenu" :class="{ active: mobileMenuOpen }">
-          <span></span>
-          <span></span>
-          <span></span>
-        </button>
-        
-        <nav :class="{ open: mobileMenuOpen }">
-          <RouterLink to="/" @click="closeMobileMenu">
-            <i class="pi pi-home"></i> Dashboard
-          </RouterLink>
-          <RouterLink to="/contacts" @click="closeMobileMenu">
-            <i class="pi pi-users"></i> Kontakte
-          </RouterLink>
-          <RouterLink to="/companies" @click="closeMobileMenu">
-            <i class="pi pi-building"></i> Unternehmen
-          </RouterLink>
-          <RouterLink to="/deals" @click="closeMobileMenu">
-            <i class="pi pi-chart-line"></i> Deals
-          </RouterLink>
-          
-          <!-- Admin Menu -->
-          <div class="nav-dropdown" v-if="authStore.isAdmin">
-            <a href="#" class="nav-dropdown-toggle" @click.prevent="toggleAdminMenu" :class="{ active: adminMenuOpen }">
-              <i class="pi pi-shield"></i> Admin
-              <i class="pi pi-chevron-down dropdown-icon" :class="{ rotated: adminMenuOpen }"></i>
-            </a>
-            <div class="nav-dropdown-menu" v-show="adminMenuOpen">
-              <RouterLink to="/users" @click="handleAdminMenuClick">
-                <i class="pi pi-user-edit"></i> Benutzerverwaltung
-              </RouterLink>
-              <RouterLink to="/roles" @click="handleAdminMenuClick">
-                <i class="pi pi-shield"></i> Rollenverwaltung
-              </RouterLink>
-              <RouterLink to="/settings" @click="handleAdminMenuClick">
-                <i class="pi pi-cog"></i> Einstellungen
-              </RouterLink>
-            </div>
-          </div>
-        </nav>
-        
-        <div class="user-info" v-if="authStore.isAuthenticated">
-          <span>{{ authStore.fullName }}</span>
-          <a href="/logout" class="logout-link">
-            <i class="pi pi-sign-out"></i> Logout
-          </a>
-        </div>
-      </div>
-    </header>
-    
-    <main class="app-main">
-      <RouterView />
-    </main>
-    
-    <footer class="app-footer">
-      <p>&copy; {{ new Date().getFullYear() }} myCRM</p>
-    </footer>
-  </div>
+  <AppLayout v-if="authStore.isAuthenticated" />
+  <RouterView v-else />
 </template>
 
 <script setup>
-import { ref } from 'vue';
-import { RouterLink, RouterView } from 'vue-router';
-import Toast from 'primevue/toast';
+import { RouterView } from 'vue-router';
 import { useAuthStore } from './stores/auth';
+import AppLayout from './layout/AppLayout.vue';
 
 const authStore = useAuthStore();
 authStore.initializeFromElement(document.getElementById('app'));
-
-const mobileMenuOpen = ref(false);
-const adminMenuOpen = ref(false);
-
-const toggleMobileMenu = () => {
-  mobileMenuOpen.value = !mobileMenuOpen.value;
-};
-
-const closeMobileMenu = () => {
-  mobileMenuOpen.value = false;
-  adminMenuOpen.value = false;
-};
-
-const toggleAdminMenu = () => {
-  adminMenuOpen.value = !adminMenuOpen.value;
-};
-
-const handleAdminMenuClick = () => {
-  closeMobileMenu();
-};
 </script>
 
 <style scoped lang="scss">
diff --git a/assets/js/layout/AppConfigurator.vue b/assets/js/layout/AppConfigurator.vue
new file mode 100644
index 0000000..3a9dc1e
--- /dev/null
+++ b/assets/js/layout/AppConfigurator.vue
@@ -0,0 +1,261 @@
+<script setup>
+import { useLayout } from './composables/layout';
+import { $t, updatePreset, updateSurfacePalette } from '@primeuix/themes';
+import Aura from '@primeuix/themes/aura';
+import Lara from '@primeuix/themes/lara';
+import Nora from '@primeuix/themes/nora';
+import SelectButton from 'primevue/selectbutton';
+import { ref, watch } from 'vue';
+
+const { layoutConfig, isDarkTheme } = useLayout();
+
+const presets = {
+    Aura,
+    Lara,
+    Nora
+};
+const preset = ref(layoutConfig.preset);
+const presetOptions = ref(Object.keys(presets));
+
+const menuMode = ref(layoutConfig.menuMode);
+const menuModeOptions = ref([
+    { label: 'Static', value: 'static' },
+    { label: 'Overlay', value: 'overlay' }
+]);
+
+// Sync with layoutConfig changes
+watch(() => layoutConfig.preset, (newVal) => {
+    preset.value = newVal;
+});
+
+watch(() => layoutConfig.menuMode, (newVal) => {
+    menuMode.value = newVal;
+});
+
+const primaryColors = ref([
+    { name: 'noir', palette: {} },
+    { name: 'emerald', palette: { 50: '#ecfdf5', 100: '#d1fae5', 200: '#a7f3d0', 300: '#6ee7b7', 400: '#34d399', 500: '#10b981', 600: '#059669', 700: '#047857', 800: '#065f46', 900: '#064e3b', 950: '#022c22' } },
+    { name: 'green', palette: { 50: '#f0fdf4', 100: '#dcfce7', 200: '#bbf7d0', 300: '#86efac', 400: '#4ade80', 500: '#22c55e', 600: '#16a34a', 700: '#15803d', 800: '#166534', 900: '#14532d', 950: '#052e16' } },
+    { name: 'lime', palette: { 50: '#f7fee7', 100: '#ecfccb', 200: '#d9f99d', 300: '#bef264', 400: '#a3e635', 500: '#84cc16', 600: '#65a30d', 700: '#4d7c0f', 800: '#3f6212', 900: '#365314', 950: '#1a2e05' } },
+    { name: 'orange', palette: { 50: '#fff7ed', 100: '#ffedd5', 200: '#fed7aa', 300: '#fdba74', 400: '#fb923c', 500: '#f97316', 600: '#ea580c', 700: '#c2410c', 800: '#9a3412', 900: '#7c2d12', 950: '#431407' } },
+    { name: 'amber', palette: { 50: '#fffbeb', 100: '#fef3c7', 200: '#fde68a', 300: '#fcd34d', 400: '#fbbf24', 500: '#f59e0b', 600: '#d97706', 700: '#b45309', 800: '#92400e', 900: '#78350f', 950: '#451a03' } },
+    { name: 'yellow', palette: { 50: '#fefce8', 100: '#fef9c3', 200: '#fef08a', 300: '#fde047', 400: '#facc15', 500: '#eab308', 600: '#ca8a04', 700: '#a16207', 800: '#854d0e', 900: '#713f12', 950: '#422006' } },
+    { name: 'teal', palette: { 50: '#f0fdfa', 100: '#ccfbf1', 200: '#99f6e4', 300: '#5eead4', 400: '#2dd4bf', 500: '#14b8a6', 600: '#0d9488', 700: '#0f766e', 800: '#115e59', 900: '#134e4a', 950: '#042f2e' } },
+    { name: 'cyan', palette: { 50: '#ecfeff', 100: '#cffafe', 200: '#a5f3fc', 300: '#67e8f9', 400: '#22d3ee', 500: '#06b6d4', 600: '#0891b2', 700: '#0e7490', 800: '#155e75', 900: '#164e63', 950: '#083344' } },
+    { name: 'sky', palette: { 50: '#f0f9ff', 100: '#e0f2fe', 200: '#bae6fd', 300: '#7dd3fc', 400: '#38bdf8', 500: '#0ea5e9', 600: '#0284c7', 700: '#0369a1', 800: '#075985', 900: '#0c4a6e', 950: '#082f49' } },
+    { name: 'blue', palette: { 50: '#eff6ff', 100: '#dbeafe', 200: '#bfdbfe', 300: '#93c5fd', 400: '#60a5fa', 500: '#3b82f6', 600: '#2563eb', 700: '#1d4ed8', 800: '#1e40af', 900: '#1e3a8a', 950: '#172554' } },
+    { name: 'indigo', palette: { 50: '#eef2ff', 100: '#e0e7ff', 200: '#c7d2fe', 300: '#a5b4fc', 400: '#818cf8', 500: '#6366f1', 600: '#4f46e5', 700: '#4338ca', 800: '#3730a3', 900: '#312e81', 950: '#1e1b4b' } },
+    { name: 'violet', palette: { 50: '#f5f3ff', 100: '#ede9fe', 200: '#ddd6fe', 300: '#c4b5fd', 400: '#a78bfa', 500: '#8b5cf6', 600: '#7c3aed', 700: '#6d28d9', 800: '#5b21b6', 900: '#4c1d95', 950: '#2e1065' } },
+    { name: 'purple', palette: { 50: '#faf5ff', 100: '#f3e8ff', 200: '#e9d5ff', 300: '#d8b4fe', 400: '#c084fc', 500: '#a855f7', 600: '#9333ea', 700: '#7e22ce', 800: '#6b21a8', 900: '#581c87', 950: '#3b0764' } },
+    { name: 'fuchsia', palette: { 50: '#fdf4ff', 100: '#fae8ff', 200: '#f5d0fe', 300: '#f0abfc', 400: '#e879f9', 500: '#d946ef', 600: '#c026d3', 700: '#a21caf', 800: '#86198f', 900: '#701a75', 950: '#4a044e' } },
+    { name: 'pink', palette: { 50: '#fdf2f8', 100: '#fce7f3', 200: '#fbcfe8', 300: '#f9a8d4', 400: '#f472b6', 500: '#ec4899', 600: '#db2777', 700: '#be185d', 800: '#9d174d', 900: '#831843', 950: '#500724' } },
+    { name: 'rose', palette: { 50: '#fff1f2', 100: '#ffe4e6', 200: '#fecdd3', 300: '#fda4af', 400: '#fb7185', 500: '#f43f5e', 600: '#e11d48', 700: '#be123c', 800: '#9f1239', 900: '#881337', 950: '#4c0519' } }
+]);
+
+const surfaces = ref([
+    {
+        name: 'slate',
+        palette: { 0: '#ffffff', 50: '#f8fafc', 100: '#f1f5f9', 200: '#e2e8f0', 300: '#cbd5e1', 400: '#94a3b8', 500: '#64748b', 600: '#475569', 700: '#334155', 800: '#1e293b', 900: '#0f172a', 950: '#020617' }
+    },
+    {
+        name: 'gray',
+        palette: { 0: '#ffffff', 50: '#f9fafb', 100: '#f3f4f6', 200: '#e5e7eb', 300: '#d1d5db', 400: '#9ca3af', 500: '#6b7280', 600: '#4b5563', 700: '#374151', 800: '#1f2937', 900: '#111827', 950: '#030712' }
+    },
+    {
+        name: 'zinc',
+        palette: { 0: '#ffffff', 50: '#fafafa', 100: '#f4f4f5', 200: '#e4e4e7', 300: '#d4d4d8', 400: '#a1a1aa', 500: '#71717a', 600: '#52525b', 700: '#3f3f46', 800: '#27272a', 900: '#18181b', 950: '#09090b' }
+    },
+    {
+        name: 'neutral',
+        palette: { 0: '#ffffff', 50: '#fafafa', 100: '#f5f5f5', 200: '#e5e5e5', 300: '#d4d4d4', 400: '#a3a3a3', 500: '#737373', 600: '#525252', 700: '#404040', 800: '#262626', 900: '#171717', 950: '#0a0a0a' }
+    },
+    {
+        name: 'stone',
+        palette: { 0: '#ffffff', 50: '#fafaf9', 100: '#f5f5f4', 200: '#e7e5e4', 300: '#d6d3d1', 400: '#a8a29e', 500: '#78716c', 600: '#57534e', 700: '#44403c', 800: '#292524', 900: '#1c1917', 950: '#0c0a09' }
+    },
+    {
+        name: 'soho',
+        palette: { 0: '#ffffff', 50: '#f4f4f4', 100: '#e8e9e9', 200: '#d2d2d4', 300: '#bbbcbe', 400: '#a5a5a9', 500: '#8e8f93', 600: '#77787d', 700: '#616268', 800: '#4a4b52', 900: '#34343d', 950: '#1d1e27' }
+    },
+    {
+        name: 'viva',
+        palette: { 0: '#ffffff', 50: '#f3f3f3', 100: '#e7e7e8', 200: '#cfd0d0', 300: '#b7b8b9', 400: '#9fa1a1', 500: '#87898a', 600: '#6e7173', 700: '#565a5b', 800: '#3e4244', 900: '#262b2c', 950: '#0e1315' }
+    },
+    {
+        name: 'ocean',
+        palette: { 0: '#ffffff', 50: '#fbfcfc', 100: '#F7F9F8', 200: '#EFF3F2', 300: '#DADEDD', 400: '#B1B7B6', 500: '#828787', 600: '#5F7274', 700: '#415B61', 800: '#29444E', 900: '#183240', 950: '#0c1920' }
+    }
+]);
+
+function getPresetExt() {
+    const color = primaryColors.value.find((c) => c.name === layoutConfig.primary);
+
+    if (color.name === 'noir') {
+        return {
+            semantic: {
+                primary: {
+                    50: '{surface.50}',
+                    100: '{surface.100}',
+                    200: '{surface.200}',
+                    300: '{surface.300}',
+                    400: '{surface.400}',
+                    500: '{surface.500}',
+                    600: '{surface.600}',
+                    700: '{surface.700}',
+                    800: '{surface.800}',
+                    900: '{surface.900}',
+                    950: '{surface.950}'
+                },
+                colorScheme: {
+                    light: {
+                        primary: {
+                            color: '{primary.950}',
+                            contrastColor: '#ffffff',
+                            hoverColor: '{primary.800}',
+                            activeColor: '{primary.700}'
+                        },
+                        highlight: {
+                            background: '{primary.950}',
+                            focusBackground: '{primary.700}',
+                            color: '#ffffff',
+                            focusColor: '#ffffff'
+                        }
+                    },
+                    dark: {
+                        primary: {
+                            color: '{primary.50}',
+                            contrastColor: '{primary.950}',
+                            hoverColor: '{primary.200}',
+                            activeColor: '{primary.300}'
+                        },
+                        highlight: {
+                            background: '{primary.50}',
+                            focusBackground: '{primary.300}',
+                            color: '{primary.950}',
+                            focusColor: '{primary.950}'
+                        }
+                    }
+                }
+            }
+        };
+    } else {
+        return {
+            semantic: {
+                primary: color.palette,
+                colorScheme: {
+                    light: {
+                        primary: {
+                            color: '{primary.500}',
+                            contrastColor: '#ffffff',
+                            hoverColor: '{primary.600}',
+                            activeColor: '{primary.700}'
+                        },
+                        highlight: {
+                            background: '{primary.50}',
+                            focusBackground: '{primary.100}',
+                            color: '{primary.700}',
+                            focusColor: '{primary.800}'
+                        }
+                    },
+                    dark: {
+                        primary: {
+                            color: '{primary.400}',
+                            contrastColor: '{surface.900}',
+                            hoverColor: '{primary.300}',
+                            activeColor: '{primary.200}'
+                        },
+                        highlight: {
+                            background: 'color-mix(in srgb, {primary.400}, transparent 84%)',
+                            focusBackground: 'color-mix(in srgb, {primary.400}, transparent 76%)',
+                            color: 'rgba(255,255,255,.87)',
+                            focusColor: 'rgba(255,255,255,.87)'
+                        }
+                    }
+                }
+            }
+        };
+    }
+}
+
+function updateColors(type, color) {
+    if (type === 'primary') {
+        layoutConfig.primary = color.name;
+        localStorage.setItem('primaryColor', color.name);
+    } else if (type === 'surface') {
+        layoutConfig.surface = color.name;
+        localStorage.setItem('surfaceColor', color.name);
+    }
+
+    applyTheme(type, color);
+}
+
+function applyTheme(type, color) {
+    if (type === 'primary') {
+        updatePreset(getPresetExt());
+    } else if (type === 'surface') {
+        updateSurfacePalette(color.palette);
+    }
+}
+
+function onPresetChange() {
+    layoutConfig.preset = preset.value;
+    localStorage.setItem('preset', preset.value);
+    const presetValue = presets[preset.value];
+    const surfacePalette = surfaces.value.find((s) => s.name === layoutConfig.surface)?.palette;
+
+    $t().preset(presetValue).preset(getPresetExt()).surfacePalette(surfacePalette).use({ useDefaultOptions: true });
+}
+
+function onMenuModeChange() {
+    layoutConfig.menuMode = menuMode.value;
+    localStorage.setItem('menuMode', menuMode.value);
+}
+</script>
+
+<template>
+    <div
+        class="config-panel hidden absolute top-[3.25rem] right-0 w-64 p-4 bg-surface-0 dark:bg-surface-900 border border-surface rounded-border origin-top shadow-[0px_3px_5px_rgba(0,0,0,0.02),0px_0px_2px_rgba(0,0,0,0.05),0px_1px_4px_rgba(0,0,0,0.08)]"
+    >
+        <div class="flex flex-col gap-4">
+            <div>
+                <span class="text-sm text-muted-color font-semibold">Primary</span>
+                <div class="pt-2 flex gap-2 flex-wrap justify-between">
+                    <button
+                        v-for="primaryColor of primaryColors"
+                        :key="primaryColor.name"
+                        type="button"
+                        :title="primaryColor.name"
+                        @click="updateColors('primary', primaryColor)"
+                        :class="['border-none w-5 h-5 rounded-full p-0 cursor-pointer outline-none outline-offset-1', { 'outline-primary': layoutConfig.primary === primaryColor.name }]"
+                        :style="{ backgroundColor: `${primaryColor.name === 'noir' ? 'var(--text-color)' : primaryColor.palette['500']}` }"
+                    ></button>
+                </div>
+            </div>
+            <div>
+                <span class="text-sm text-muted-color font-semibold">Surface</span>
+                <div class="pt-2 flex gap-2 flex-wrap justify-between">
+                    <button
+                        v-for="surface of surfaces"
+                        :key="surface.name"
+                        type="button"
+                        :title="surface.name"
+                        @click="updateColors('surface', surface)"
+                        :class="[
+                            'border-none w-5 h-5 rounded-full p-0 cursor-pointer outline-none outline-offset-1',
+                            { 'outline-primary': layoutConfig.surface ? layoutConfig.surface === surface.name : isDarkTheme ? surface.name === 'zinc' : surface.name === 'slate' }
+                        ]"
+                        :style="{ backgroundColor: `${surface.palette['500']}` }"
+                    ></button>
+                </div>
+            </div>
+            <div class="flex flex-col gap-2">
+                <span class="text-sm text-muted-color font-semibold">Presets</span>
+                <SelectButton v-model="preset" @change="onPresetChange" :options="presetOptions" :allowEmpty="false" />
+            </div>
+            <div class="flex flex-col gap-2">
+                <span class="text-sm text-muted-color font-semibold">Menu Mode</span>
+                <SelectButton v-model="menuMode" @change="onMenuModeChange" :options="menuModeOptions" :allowEmpty="false" optionLabel="label" optionValue="value" />
+            </div>
+        </div>
+    </div>
+</template>
diff --git a/assets/js/layout/AppFooter.vue b/assets/js/layout/AppFooter.vue
new file mode 100644
index 0000000..487141c
--- /dev/null
+++ b/assets/js/layout/AppFooter.vue
@@ -0,0 +1,8 @@
+<script setup></script>
+
+<template>
+    <div class="layout-footer">
+        SAKAI by
+        <a href="https://primevue.org" target="_blank" rel="noopener noreferrer" class="text-primary font-bold hover:underline">PrimeVue</a>
+    </div>
+</template>
diff --git a/assets/js/layout/AppLayout.vue b/assets/js/layout/AppLayout.vue
new file mode 100644
index 0000000..c4ccb0b
--- /dev/null
+++ b/assets/js/layout/AppLayout.vue
@@ -0,0 +1,71 @@
+<script setup>
+import { useLayout } from './composables/layout';
+import { computed, ref, watch } from 'vue';
+import AppFooter from './AppFooter.vue';
+import AppSidebar from './AppSidebar.vue';
+import AppTopbar from './AppTopbar.vue';
+
+const { layoutConfig, layoutState, isSidebarActive } = useLayout();
+
+const outsideClickListener = ref(null);
+
+watch(isSidebarActive, (newVal) => {
+    if (newVal) {
+        bindOutsideClickListener();
+    } else {
+        unbindOutsideClickListener();
+    }
+});
+
+const containerClass = computed(() => {
+    return {
+        'layout-overlay': layoutConfig.menuMode === 'overlay',
+        'layout-static': layoutConfig.menuMode === 'static',
+        'layout-static-inactive': layoutState.staticMenuDesktopInactive && layoutConfig.menuMode === 'static',
+        'layout-overlay-active': layoutState.overlayMenuActive,
+        'layout-mobile-active': layoutState.staticMenuMobileActive
+    };
+});
+
+function bindOutsideClickListener() {
+    if (!outsideClickListener.value) {
+        outsideClickListener.value = (event) => {
+            if (isOutsideClicked(event)) {
+                layoutState.overlayMenuActive = false;
+                layoutState.staticMenuMobileActive = false;
+                layoutState.menuHoverActive = false;
+            }
+        };
+        document.addEventListener('click', outsideClickListener.value);
+    }
+}
+
+function unbindOutsideClickListener() {
+    if (outsideClickListener.value) {
+        document.removeEventListener('click', outsideClickListener);
+        outsideClickListener.value = null;
+    }
+}
+
+function isOutsideClicked(event) {
+    const sidebarEl = document.querySelector('.layout-sidebar');
+    const topbarEl = document.querySelector('.layout-menu-button');
+
+    return !(sidebarEl.isSameNode(event.target) || sidebarEl.contains(event.target) || topbarEl.isSameNode(event.target) || topbarEl.contains(event.target));
+}
+</script>
+
+<template>
+    <div class="layout-wrapper" :class="containerClass">
+        <app-topbar></app-topbar>
+        <app-sidebar></app-sidebar>
+        <div class="layout-main-container">
+            <div class="layout-main">
+                <router-view></router-view>
+            </div>
+            <app-footer></app-footer>
+        </div>
+        <div class="layout-mask animate-fadein"></div>
+    </div>
+    <Toast />
+</template>
diff --git a/assets/js/layout/AppMenu.vue b/assets/js/layout/AppMenu.vue
new file mode 100644
index 0000000..540bc10
--- /dev/null
+++ b/assets/js/layout/AppMenu.vue
@@ -0,0 +1,40 @@
+<script setup>
+import { ref } from 'vue';
+import { useAuthStore } from '../stores/auth';
+import AppMenuItem from './AppMenuItem.vue';
+
+const authStore = useAuthStore();
+
+const model = ref([
+    {
+        label: 'Home',
+        items: [{ label: 'Dashboard', icon: 'pi pi-fw pi-home', to: '/' }]
+    },
+    {
+        label: 'CRM',
+        items: [
+            { label: 'Kontakte', icon: 'pi pi-fw pi-users', to: '/contacts' }
+        ]
+    },
+    {
+        label: 'Administration',
+        visible: () => authStore.isAdmin,
+        items: [
+            { label: 'Benutzerverwaltung', icon: 'pi pi-fw pi-user-edit', to: '/users' },
+            { label: 'Rollenverwaltung', icon: 'pi pi-fw pi-shield', to: '/roles' },
+            { label: 'Einstellungen', icon: 'pi pi-fw pi-cog', to: '/settings' }
+        ]
+    }
+]);
+</script>
+
+<template>
+    <ul class="layout-menu">
+        <template v-for="(item, i) in model" :key="item">
+            <app-menu-item v-if="!item.separator && (!item.visible || item.visible())" :item="item" :index="i"></app-menu-item>
+            <li v-if="item.separator" class="menu-separator"></li>
+        </template>
+    </ul>
+</template>
+
+<style lang="scss" scoped></style>
diff --git a/assets/js/layout/AppMenuItem.vue b/assets/js/layout/AppMenuItem.vue
new file mode 100644
index 0000000..65ae9a0
--- /dev/null
+++ b/assets/js/layout/AppMenuItem.vue
@@ -0,0 +1,92 @@
+<script setup>
+import { useLayout } from './composables/layout';
+import { onBeforeMount, ref, watch } from 'vue';
+import { useRoute } from 'vue-router';
+
+const route = useRoute();
+
+const { layoutState, setActiveMenuItem, toggleMenu } = useLayout();
+
+const props = defineProps({
+    item: {
+        type: Object,
+        default: () => ({})
+    },
+    index: {
+        type: Number,
+        default: 0
+    },
+    root: {
+        type: Boolean,
+        default: true
+    },
+    parentItemKey: {
+        type: String,
+        default: null
+    }
+});
+
+const isActiveMenu = ref(false);
+const itemKey = ref(null);
+
+onBeforeMount(() => {
+    itemKey.value = props.parentItemKey ? props.parentItemKey + '-' + props.index : String(props.index);
+
+    const activeItem = layoutState.activeMenuItem;
+
+    isActiveMenu.value = activeItem === itemKey.value || activeItem ? activeItem.startsWith(itemKey.value + '-') : false;
+});
+
+watch(
+    () => layoutState.activeMenuItem,
+    (newVal) => {
+        isActiveMenu.value = newVal === itemKey.value || newVal.startsWith(itemKey.value + '-');
+    }
+);
+
+function itemClick(event, item) {
+    if (item.disabled) {
+        event.preventDefault();
+        return;
+    }
+
+    if ((item.to || item.url) && (layoutState.staticMenuMobileActive || layoutState.overlayMenuActive)) {
+        toggleMenu();
+    }
+
+    if (item.command) {
+        item.command({ originalEvent: event, item: item });
+    }
+
+    const foundItemKey = item.items ? (isActiveMenu.value ? props.parentItemKey : itemKey) : itemKey.value;
+
+    setActiveMenuItem(foundItemKey);
+}
+
+function checkActiveRoute(item) {
+    return route.path === item.to;
+}
+</script>
+
+<template>
+    <li :class="{ 'layout-root-menuitem': root, 'active-menuitem': isActiveMenu }">
+        <div v-if="root && item.visible !== false" class="layout-menuitem-root-text">{{ item.label }}</div>
+        <a v-if="(!item.to || item.items) && item.visible !== false" :href="item.url" @click="itemClick($event, item, index)" :class="item.class" :target="item.target" tabindex="0">
+            <i :class="item.icon" class="layout-menuitem-icon"></i>
+            <span class="layout-menuitem-text">{{ item.label }}</span>
+            <i class="pi pi-fw pi-angle-down layout-submenu-toggler" v-if="item.items"></i>
+        </a>
+        <router-link v-if="item.to && !item.items && item.visible !== false" @click="itemClick($event, item, index)" :class="[item.class, { 'active-route': checkActiveRoute(item) }]" tabindex="0" :to="item.to">
+            <i :class="item.icon" class="layout-menuitem-icon"></i>
+            <span class="layout-menuitem-text">{{ item.label }}</span>
+            <i class="pi pi-fw pi-angle-down layout-submenu-toggler" v-if="item.items"></i>
+        </router-link>
+        <Transition v-if="item.items && item.visible !== false" name="layout-submenu">
+            <ul v-show="root ? true : isActiveMenu" class="layout-submenu">
+                <app-menu-item v-for="(child, i) in item.items" :key="child" :index="i" :item="child" :parentItemKey="itemKey" :root="false"></app-menu-item>
+            </ul>
+        </Transition>
+    </li>
+</template>
+
+<style lang="scss" scoped></style>
diff --git a/assets/js/layout/AppSidebar.vue b/assets/js/layout/AppSidebar.vue
new file mode 100644
index 0000000..0c10c84
--- /dev/null
+++ b/assets/js/layout/AppSidebar.vue
@@ -0,0 +1,11 @@
+<script setup>
+import AppMenu from './AppMenu.vue';
+</script>
+
+<template>
+    <div class="layout-sidebar">
+        <app-menu></app-menu>
+    </div>
+</template>
+
+<style lang="scss" scoped></style>
diff --git a/assets/js/layout/AppTopbar.vue b/assets/js/layout/AppTopbar.vue
new file mode 100644
index 0000000..05a04e6
--- /dev/null
+++ b/assets/js/layout/AppTopbar.vue
@@ -0,0 +1,96 @@
+<script setup>
+import { useLayout } from './composables/layout';
+import { useAuthStore } from '../stores/auth';
+import AppConfigurator from './AppConfigurator.vue';
+
+const { toggleMenu, toggleDarkMode, isDarkTheme } = useLayout();
+const authStore = useAuthStore();
+
+async function logout() {
+    await authStore.logout();
+}
+</script>
+
+<template>
+    <div class="layout-topbar">
+        <div class="layout-topbar-logo-container">
+            <button class="layout-menu-button layout-topbar-action" @click="toggleMenu">
+                <i class="pi pi-bars"></i>
+            </button>
+            <router-link to="/" class="layout-topbar-logo">
+                <span class="text-2xl font-bold">myCRM</span>
+            </router-link>
+        </div>
+
+        <div class="layout-topbar-actions">
+            <div class="layout-config-menu">
+                <button type="button" class="layout-topbar-action" @click="toggleDarkMode">
+                    <i :class="['pi', { 'pi-moon': isDarkTheme, 'pi-sun': !isDarkTheme }]"></i>
+                </button>
+                <div class="relative">
+                    <button
+                        v-styleclass="{ selector: '@next', enterFromClass: 'hidden', enterActiveClass: 'animate-scalein', leaveToClass: 'hidden', leaveActiveClass: 'animate-fadeout', hideOnOutsideClick: true }"
+                        type="button"
+                        class="layout-topbar-action layout-topbar-action-highlight"
+                    >
+                        <i class="pi pi-palette"></i>
+                    </button>
+                    <AppConfigurator />
+                </div>
+            </div>
+
+            <button
+                class="layout-topbar-menu-button layout-topbar-action lg:hidden"
+                v-styleclass="{ selector: '@next', enterFromClass: 'hidden', enterActiveClass: 'animate-scalein', leaveToClass: 'hidden', leaveActiveClass: 'animate-fadeout', hideOnOutsideClick: true }"
+            >
+                <i class="pi pi-ellipsis-v"></i>
+            </button>
+
+            <div class="layout-topbar-menu hidden lg:flex">
+                <div class="relative">
+                    <button
+                        type="button"
+                        class="layout-topbar-action"
+                        v-styleclass="{ selector: '@next', enterFromClass: 'hidden', enterActiveClass: 'animate-scalein', leaveToClass: 'hidden', leaveActiveClass: 'animate-fadeout', hideOnOutsideClick: true }"
+                    >
+                        <i class="pi pi-user"></i>
+                        <span>{{ authStore.user?.email?.split('@')[0] }}</span>
+                    </button>
+                    <div class="hidden absolute right-0 top-full mt-2 bg-surface-0 dark:bg-surface-900 border border-surface-200 dark:border-surface-700 rounded-lg shadow-lg p-4 min-w-[280px] z-[1000]">
+                        <div class="flex items-center gap-3 pb-3 border-b border-surface-200 dark:border-surface-700">
+                            <div class="w-12 h-12 rounded-full bg-primary text-primary-contrast flex items-center justify-center text-xl font-bold">
+                                {{ (authStore.user?.fullName || authStore.user?.email || 'U').charAt(0).toUpperCase() }}
+                            </div>
+                            <div class="flex-1">
+                                <div class="font-semibold text-surface-900 dark:text-surface-0">
+                                    {{ authStore.user?.fullName || authStore.user?.email?.split('@')[0] }}
+                                </div>
+                                <div class="text-sm text-surface-600 dark:text-surface-400">
+                                    {{ authStore.user?.email }}
+                                </div>
+                            </div>
+                        </div>
+                        <div class="pt-3 space-y-2">
+                            <div class="flex items-center gap-2 text-sm">
+                                <i class="pi pi-shield text-surface-500"></i>
+                                <span class="text-surface-700 dark:text-surface-300">
+                                    {{ authStore.user?.roles?.join(', ') || 'Keine Rolle' }}
+                                </span>
+                            </div>
+                            <div class="flex items-center gap-2 text-sm" v-if="authStore.user?.createdAt">
+                                <i class="pi pi-calendar text-surface-500"></i>
+                                <span class="text-surface-700 dark:text-surface-300">
+                                    Mitglied seit {{ new Date(authStore.user.createdAt).toLocaleDateString('de-DE') }}
+                                </span>
+                            </div>
+                        </div>
+                    </div>
+                </div>
+                <button type="button" class="layout-topbar-action" @click="logout">
+                    <i class="pi pi-sign-out"></i>
+                    <span>Logout</span>
+                </button>
+            </div>
+        </div>
+    </div>
+</template>
diff --git a/assets/js/layout/composables/layout.js b/assets/js/layout/composables/layout.js
new file mode 100644
index 0000000..6daae71
--- /dev/null
+++ b/assets/js/layout/composables/layout.js
@@ -0,0 +1,87 @@
+import { computed, reactive } from 'vue';
+
+// Load preferences from localStorage
+const savedDarkMode = localStorage.getItem('darkMode') === 'true';
+const savedPrimary = localStorage.getItem('primaryColor') || 'emerald';
+const savedSurface = localStorage.getItem('surfaceColor') || null;
+const savedPreset = localStorage.getItem('preset') || 'Aura';
+const savedMenuMode = localStorage.getItem('menuMode') || 'static';
+
+const layoutConfig = reactive({
+    preset: savedPreset,
+    primary: savedPrimary,
+    surface: savedSurface,
+    darkTheme: savedDarkMode,
+    menuMode: savedMenuMode
+});
+
+// Apply dark mode on initial load
+if (savedDarkMode) {
+    document.documentElement.classList.add('app-dark');
+}
+
+const layoutState = reactive({
+    staticMenuDesktopInactive: false,
+    overlayMenuActive: false,
+    profileSidebarVisible: false,
+    configSidebarVisible: false,
+    staticMenuMobileActive: false,
+    menuHoverActive: false,
+    activeMenuItem: null
+});
+
+export function useLayout() {
+    const setActiveMenuItem = (item) => {
+        layoutState.activeMenuItem = item.value || item;
+    };
+
+    const toggleDarkMode = () => {
+        if (!document.startViewTransition) {
+            executeDarkModeToggle();
+
+            return;
+        }
+
+        document.startViewTransition(() => executeDarkModeToggle(event));
+    };
+
+    const executeDarkModeToggle = () => {
+        layoutConfig.darkTheme = !layoutConfig.darkTheme;
+        document.documentElement.classList.toggle('app-dark');
+        
+        // Save preference to localStorage
+        localStorage.setItem('darkMode', layoutConfig.darkTheme.toString());
+    };
+
+    const toggleMenu = () => {
+        if (layoutConfig.menuMode === 'overlay') {
+            layoutState.overlayMenuActive = !layoutState.overlayMenuActive;
+        }
+
+        if (window.innerWidth > 991) {
+            layoutState.staticMenuDesktopInactive = !layoutState.staticMenuDesktopInactive;
+        } else {
+            layoutState.staticMenuMobileActive = !layoutState.staticMenuMobileActive;
+        }
+    };
+
+    const isSidebarActive = computed(() => layoutState.overlayMenuActive || layoutState.staticMenuMobileActive);
+
+    const isDarkTheme = computed(() => layoutConfig.darkTheme);
+
+    const getPrimary = computed(() => layoutConfig.primary);
+
+    const getSurface = computed(() => layoutConfig.surface);
+
+    return {
+        layoutConfig,
+        layoutState,
+        toggleMenu,
+        isSidebarActive,
+        isDarkTheme,
+        getPrimary,
+        getSurface,
+        setActiveMenuItem,
+        toggleDarkMode
+    };
+}
diff --git a/assets/js/router.js b/assets/js/router.js
index 9720a25..8702bf4 100644
--- a/assets/js/router.js
+++ b/assets/js/router.js
@@ -1,17 +1,13 @@
 import { createRouter, createWebHistory } from 'vue-router';
 import Dashboard from './views/Dashboard.vue';
-import ContactList from './views/ContactList.vue';
-import CompanyList from './views/CompanyList.vue';
-import DealList from './views/DealList.vue';
+import ContactManagement from './views/ContactManagement.vue';
 import UserManagement from './views/UserManagement.vue';
 import RoleManagement from './views/RoleManagement.vue';
 import SettingsManagement from './views/SettingsManagement.vue';
 
 const routes = [
     { path: '/', name: 'dashboard', component: Dashboard },
-    { path: '/contacts', name: 'contacts', component: ContactList },
-    { path: '/companies', name: 'companies', component: CompanyList },
-    { path: '/deals', name: 'deals', component: DealList },
+    { path: '/contacts', name: 'contacts', component: ContactManagement },
     { path: '/users', name: 'users', component: UserManagement, meta: { requiresAdmin: true } },
     { path: '/roles', name: 'roles', component: RoleManagement, meta: { requiresAdmin: true } },
     { path: '/settings', name: 'settings', component: SettingsManagement, meta: { requiresAdmin: true } },
diff --git a/assets/js/views/ContactManagement.vue b/assets/js/views/ContactManagement.vue
new file mode 100644
index 0000000..5c0ee6e
--- /dev/null
+++ b/assets/js/views/ContactManagement.vue
@@ -0,0 +1,789 @@
+<template>
+  <div class="contact-management">
+    <div class="flex justify-content-between align-items-center mb-4">
+      <h1 class="text-3xl font-bold">Kontakte</h1>
+      <Button label="Neuer Kontakt" icon="pi pi-plus" @click="openNewContactDialog" />
+    </div>
+
+    <Card>
+      <template #content>
+        <DataTable
+          v-model:filters="globalFilter"
+          :value="contacts"
+          :loading="loading"
+          paginator
+          :rows="10"
+          :rowsPerPageOptions="[10, 25, 50]"
+          :globalFilterFields="['companyName', 'city', 'email']"
+          sortField="companyName"
+          :sortOrder="1"
+        >
+          <template #header>
+            <div class="flex justify-content-between">
+              <IconField iconPosition="left">
+                <InputIcon>
+                  <i class="pi pi-search" />
+                </InputIcon>
+                <InputText
+                  v-model="globalFilter"
+                  placeholder="Suchen..."
+                  style="width: 300px"
+                />
+              </IconField>
+              <div class="flex gap-2">
+                <Button
+                  label="Alle"
+                  :outlined="typeFilter !== 'all'"
+                  @click="filterByType('all')"
+                  size="small"
+                />
+                <Button
+                  label="Debitoren"
+                  :outlined="typeFilter !== 'debtor'"
+                  @click="filterByType('debtor')"
+                  size="small"
+                />
+                <Button
+                  label="Kreditoren"
+                  :outlined="typeFilter !== 'creditor'"
+                  @click="filterByType('creditor')"
+                  size="small"
+                />
+              </div>
+            </div>
+          </template>
+
+          <Column field="companyName" header="Firma" sortable style="min-width: 200px">
+            <template #body="{ data }">
+              <div class="font-semibold">{{ data.companyName }}</div>
+              <div class="text-sm text-500" v-if="data.companyNumber">
+                Nr: {{ data.companyNumber }}
+              </div>
+            </template>
+          </Column>
+
+          <Column field="city" header="Ort" sortable style="min-width: 150px">
+            <template #body="{ data }">
+              <div v-if="data.zipCode || data.city">
+                {{ data.zipCode }} {{ data.city }}
+              </div>
+              <div class="text-sm text-500" v-if="data.country">
+                {{ data.country }}
+              </div>
+            </template>
+          </Column>
+
+          <Column header="Ansprechpartner" style="min-width: 200px">
+            <template #body="{ data }">
+              <div v-if="data.contactPersons && data.contactPersons.length > 0">
+                <div
+                  v-for="person in data.contactPersons.slice(0, 2)"
+                  :key="person.id"
+                  class="mb-1"
+                >
+                  <div class="font-medium">
+                    {{ person.firstName }} {{ person.lastName }}
+                    <Tag v-if="person.isPrimary" value="Primär" severity="info" class="ml-1" />
+                  </div>
+                  <div class="text-sm text-500" v-if="person.email">
+                    {{ person.email }}
+                  </div>
+                </div>
+              </div>
+              <span v-else class="text-500">Keine Ansprechpartner</span>
+            </template>
+          </Column>
+
+          <Column header="Typ" style="min-width: 130px">
+            <template #body="{ data }">
+              <div class="flex gap-1">
+                <Tag v-if="data.isDebtor" value="Debitor" severity="success" />
+                <Tag v-if="data.isCreditor" value="Kreditor" severity="warning" />
+              </div>
+            </template>
+          </Column>
+
+          <Column header="Status" style="min-width: 100px">
+            <template #body="{ data }">
+              <Tag
+                :value="data.isActive ? 'Aktiv' : 'Inaktiv'"
+                :severity="data.isActive ? 'success' : 'danger'"
+              />
+            </template>
+          </Column>
+
+          <Column header="Kontakt" style="min-width: 200px">
+            <template #body="{ data }">
+              <div class="flex flex-column gap-1">
+                <div v-if="data.phone" class="text-sm">
+                  <i class="pi pi-phone mr-1"></i> {{ data.phone }}
+                </div>
+                <div v-if="data.email" class="text-sm">
+                  <i class="pi pi-envelope mr-1"></i> {{ data.email }}
+                </div>
+                <div v-if="data.website" class="text-sm">
+                  <i class="pi pi-globe mr-1"></i>
+                  <a :href="data.website" target="_blank">{{ data.website }}</a>
+                </div>
+              </div>
+            </template>
+          </Column>
+
+          <Column :exportable="false" style="min-width: 120px">
+            <template #body="{ data }">
+              <div class="flex gap-2">
+                <Button
+                  icon="pi pi-pencil"
+                  outlined
+                  rounded
+                  @click="editContact(data)"
+                  size="small"
+                />
+                <Button
+                  icon="pi pi-trash"
+                  outlined
+                  rounded
+                  severity="danger"
+                  @click="confirmDelete(data)"
+                  size="small"
+                />
+              </div>
+            </template>
+          </Column>
+
+          <template #empty>Keine Kontakte gefunden.</template>
+        </DataTable>
+      </template>
+    </Card>
+
+    <!-- Contact Dialog -->
+    <Dialog
+      v-model:visible="contactDialog"
+      :header="editingContact?.id ? 'Kontakt bearbeiten' : 'Neuer Kontakt'"
+      :modal="true"
+      :style="{ width: '1000px' }"
+      :closable="true"
+      class="contact-dialog"
+    >
+      <div v-if="editingContact">
+        <!-- Basisdaten -->
+        <Card class="mb-3">
+          <template #title>
+            <div class="flex align-items-center gap-2">
+              <i class="pi pi-building text-primary"></i>
+              <span>Basisdaten</span>
+            </div>
+          </template>
+          <template #content>
+            <div class="formgrid grid">
+              <div class="field col-12 md:col-8">
+                <label for="companyName" class="block mb-2 font-medium">
+                  Firmenname <span class="text-red-500">*</span>
+                </label>
+                <InputText
+                  id="companyName"
+                  v-model="editingContact.companyName"
+                  class="w-full"
+                  :class="{ 'p-invalid': submitted && !editingContact.companyName }"
+                />
+                <small v-if="submitted && !editingContact.companyName" class="p-error">
+                  Firmenname ist erforderlich
+                </small>
+              </div>
+
+              <div class="field col-12 md:col-4">
+                <label for="companyNumber" class="block mb-2 font-medium">Kundennummer</label>
+                <InputText id="companyNumber" v-model="editingContact.companyNumber" class="w-full" />
+              </div>
+
+              <div class="field col-12">
+                <div class="flex gap-4">
+                  <div class="field-checkbox mb-0">
+                    <Checkbox
+                      inputId="isDebtor"
+                      v-model="editingContact.isDebtor"
+                      :binary="true"
+                    />
+                    <label for="isDebtor" class="ml-2">Debitor</label>
+                  </div>
+                  <div class="field-checkbox mb-0">
+                    <Checkbox
+                      inputId="isCreditor"
+                      v-model="editingContact.isCreditor"
+                      :binary="true"
+                    />
+                    <label for="isCreditor" class="ml-2">Kreditor</label>
+                  </div>
+                  <div class="field-checkbox mb-0">
+                    <Checkbox
+                      inputId="isActive"
+                      v-model="editingContact.isActive"
+                      :binary="true"
+                    />
+                    <label for="isActive" class="ml-2">Aktiv</label>
+                  </div>
+                </div>
+              </div>
+            </div>
+          </template>
+        </Card>
+
+        <!-- Adresse -->
+        <Card class="mb-3">
+          <template #title>
+            <div class="flex align-items-center gap-2">
+              <i class="pi pi-map-marker text-primary"></i>
+              <span>Adresse</span>
+            </div>
+          </template>
+          <template #content>
+            <div class="formgrid grid">
+              <div class="field col-12">
+                <label for="street" class="block mb-2 font-medium">Straße</label>
+                <InputText id="street" v-model="editingContact.street" class="w-full" />
+              </div>
+
+              <div class="field col-12 md:col-3">
+                <label for="zipCode" class="block mb-2 font-medium">PLZ</label>
+                <InputText id="zipCode" v-model="editingContact.zipCode" class="w-full" />
+              </div>
+
+              <div class="field col-12 md:col-5">
+                <label for="city" class="block mb-2 font-medium">Ort</label>
+                <InputText id="city" v-model="editingContact.city" class="w-full" />
+              </div>
+
+              <div class="field col-12 md:col-4">
+                <label for="country" class="block mb-2 font-medium">Land</label>
+                <InputText id="country" v-model="editingContact.country" class="w-full" />
+              </div>
+            </div>
+          </template>
+        </Card>
+
+        <!-- Kontaktdaten -->
+        <Card class="mb-3">
+          <template #title>
+            <div class="flex align-items-center gap-2">
+              <i class="pi pi-phone text-primary"></i>
+              <span>Kontaktdaten</span>
+            </div>
+          </template>
+          <template #content>
+            <div class="formgrid grid">
+              <div class="field col-12 md:col-6">
+                <label for="phone" class="block mb-2 font-medium">Telefon</label>
+                <InputText id="phone" v-model="editingContact.phone" class="w-full" />
+              </div>
+
+              <div class="field col-12 md:col-6">
+                <label for="fax" class="block mb-2 font-medium">Fax</label>
+                <InputText id="fax" v-model="editingContact.fax" class="w-full" />
+              </div>
+
+              <div class="field col-12 md:col-6">
+                <label for="email" class="block mb-2 font-medium">E-Mail</label>
+                <InputText id="email" v-model="editingContact.email" type="email" class="w-full" />
+              </div>
+
+              <div class="field col-12 md:col-6">
+                <label for="website" class="block mb-2 font-medium">Website</label>
+                <InputText id="website" v-model="editingContact.website" class="w-full" />
+              </div>
+            </div>
+          </template>
+        </Card>
+
+        <!-- Steuerdaten -->
+        <Card class="mb-3">
+          <template #title>
+            <div class="flex align-items-center gap-2">
+              <i class="pi pi-calculator text-primary"></i>
+              <span>Steuerdaten</span>
+            </div>
+          </template>
+          <template #content>
+            <div class="formgrid grid">
+              <div class="field col-12 md:col-6">
+                <label for="taxNumber" class="block mb-2 font-medium">Steuernummer</label>
+                <InputText id="taxNumber" v-model="editingContact.taxNumber" class="w-full" />
+              </div>
+
+              <div class="field col-12 md:col-6">
+                <label for="vatNumber" class="block mb-2 font-medium">USt-IdNr.</label>
+                <InputText id="vatNumber" v-model="editingContact.vatNumber" class="w-full" />
+              </div>
+            </div>
+          </template>
+        </Card>
+
+        <!-- Ansprechpartner -->
+        <Card class="mb-3">
+          <template #title>
+            <div class="flex align-items-center justify-content-between">
+              <div class="flex align-items-center gap-2">
+                <i class="pi pi-users text-primary"></i>
+                <span>Ansprechpartner</span>
+              </div>
+              <Button
+                label="Hinzufügen"
+                icon="pi pi-plus"
+                size="small"
+                outlined
+                @click="addContactPerson"
+                :disabled="editingContact.contactPersons.length >= 2"
+              />
+            </div>
+          </template>
+          <template #content>
+            <div v-if="editingContact.contactPersons.length === 0" class="text-center py-4 text-500">
+              <i class="pi pi-user-plus text-4xl mb-3"></i>
+              <p>Noch keine Ansprechpartner hinzugefügt</p>
+            </div>
+
+            <div
+              v-for="(person, index) in editingContact.contactPersons"
+              :key="index"
+              class="mb-4"
+            >
+              <Divider v-if="index > 0" />
+              <div class="formgrid grid">
+                <div class="field col-12 flex justify-content-between align-items-center mb-3">
+                  <h4 class="m-0 font-semibold">
+                    <i class="pi pi-user mr-2"></i>
+                    Ansprechpartner {{ index + 1 }}
+                    <Tag v-if="person.isPrimary" value="Primär" severity="info" class="ml-2" />
+                  </h4>
+                  <Button
+                    icon="pi pi-trash"
+                    text
+                    rounded
+                    severity="danger"
+                    @click="removeContactPerson(index)"
+                    size="small"
+                  />
+                </div>
+
+                <div class="field col-12 md:col-3">
+                  <label :for="'salutation-' + index" class="block mb-2 font-medium">
+                    Anrede
+                  </label>
+                  <Dropdown
+                    :id="'salutation-' + index"
+                    v-model="person.salutation"
+                    :options="salutations"
+                    placeholder="Wählen..."
+                    class="w-full"
+                  />
+                </div>
+
+                <div class="field col-12 md:col-3">
+                  <label :for="'title-' + index" class="block mb-2 font-medium">Titel</label>
+                  <InputText :id="'title-' + index" v-model="person.title" class="w-full" />
+                </div>
+
+                <div class="field col-12 md:col-3">
+                  <label :for="'firstName-' + index" class="block mb-2 font-medium">
+                    Vorname <span class="text-red-500">*</span>
+                  </label>
+                  <InputText
+                    :id="'firstName-' + index"
+                    v-model="person.firstName"
+                    class="w-full"
+                    :class="{ 'p-invalid': submitted && !person.firstName }"
+                  />
+                </div>
+
+                <div class="field col-12 md:col-3">
+                  <label :for="'lastName-' + index" class="block mb-2 font-medium">
+                    Nachname <span class="text-red-500">*</span>
+                  </label>
+                  <InputText
+                    :id="'lastName-' + index"
+                    v-model="person.lastName"
+                    class="w-full"
+                    :class="{ 'p-invalid': submitted && !person.lastName }"
+                  />
+                </div>
+
+                <div class="field col-12 md:col-6">
+                  <label :for="'position-' + index" class="block mb-2 font-medium">
+                    Position
+                  </label>
+                  <InputText :id="'position-' + index" v-model="person.position" class="w-full" />
+                </div>
+
+                <div class="field col-12 md:col-6">
+                  <label :for="'department-' + index" class="block mb-2 font-medium">
+                    Abteilung
+                  </label>
+                  <InputText
+                    :id="'department-' + index"
+                    v-model="person.department"
+                    class="w-full"
+                  />
+                </div>
+
+                <div class="field col-12 md:col-4">
+                  <label :for="'personPhone-' + index" class="block mb-2 font-medium">
+                    Telefon
+                  </label>
+                  <InputText
+                    :id="'personPhone-' + index"
+                    v-model="person.phone"
+                    class="w-full"
+                  />
+                </div>
+
+                <div class="field col-12 md:col-4">
+                  <label :for="'mobile-' + index" class="block mb-2 font-medium">Mobil</label>
+                  <InputText :id="'mobile-' + index" v-model="person.mobile" class="w-full" />
+                </div>
+
+                <div class="field col-12 md:col-4">
+                  <label :for="'personEmail-' + index" class="block mb-2 font-medium">
+                    E-Mail
+                  </label>
+                  <InputText
+                    :id="'personEmail-' + index"
+                    v-model="person.email"
+                    type="email"
+                    class="w-full"
+                  />
+                </div>
+
+                <div class="field col-12">
+                  <div class="field-checkbox mb-0">
+                    <Checkbox
+                      :inputId="'isPrimary-' + index"
+                      v-model="person.isPrimary"
+                      :binary="true"
+                    />
+                    <label :for="'isPrimary-' + index" class="ml-2">
+                      Hauptansprechpartner
+                    </label>
+                  </div>
+                </div>
+              </div>
+            </div>
+          </template>
+        </Card>
+
+        <!-- Notizen -->
+        <Card>
+          <template #title>
+            <div class="flex align-items-center gap-2">
+              <i class="pi pi-comment text-primary"></i>
+              <span>Notizen</span>
+            </div>
+          </template>
+          <template #content>
+            <Textarea 
+              id="notes" 
+              v-model="editingContact.notes" 
+              class="w-full" 
+              :rows="4"
+              placeholder="Interne Notizen zu diesem Kontakt..."
+            />
+          </template>
+        </Card>
+      </div>
+
+      <template #footer>
+        <Button label="Abbrechen" outlined @click="hideDialog" />
+        <Button label="Speichern" @click="saveContact" :loading="saving" />
+      </template>
+    </Dialog>
+
+    <!-- Delete Confirmation -->
+    <Dialog
+      v-model:visible="deleteDialog"
+      header="Bestätigung"
+      :modal="true"
+      :style="{ width: '450px' }"
+    >
+      <div class="flex align-items-center">
+        <i class="pi pi-exclamation-triangle mr-3" style="font-size: 2rem; color: var(--red-500)"></i>
+        <span v-if="editingContact">
+          Möchten Sie den Kontakt <b>{{ editingContact.companyName }}</b> wirklich löschen?
+        </span>
+      </div>
+      <template #footer>
+        <Button label="Nein" outlined @click="deleteDialog = false" />
+        <Button label="Ja" severity="danger" @click="deleteContact" :loading="deleting" />
+      </template>
+    </Dialog>
+  </div>
+</template>
+
+<script setup>
+import { ref, onMounted } from 'vue'
+import { useToast } from 'primevue/usetoast'
+import DataTable from 'primevue/datatable'
+import Column from 'primevue/column'
+import Button from 'primevue/button'
+import InputText from 'primevue/inputtext'
+import Textarea from 'primevue/textarea'
+import Dialog from 'primevue/dialog'
+import Card from 'primevue/card'
+import Tag from 'primevue/tag'
+import Checkbox from 'primevue/checkbox'
+import Dropdown from 'primevue/dropdown'
+import Divider from 'primevue/divider'
+import IconField from 'primevue/iconfield'
+import InputIcon from 'primevue/inputicon'
+
+const toast = useToast()
+
+const contacts = ref([])
+const loading = ref(false)
+const contactDialog = ref(false)
+const deleteDialog = ref(false)
+const editingContact = ref(null)
+const submitted = ref(false)
+const saving = ref(false)
+const deleting = ref(false)
+const typeFilter = ref('all')
+const globalFilter = ref('')
+
+const salutations = ref(['Herr', 'Frau', 'Divers'])
+
+const emptyContact = () => ({
+  companyName: '',
+  companyNumber: '',
+  street: '',
+  zipCode: '',
+  city: '',
+  country: 'Deutschland',
+  phone: '',
+  fax: '',
+  email: '',
+  website: '',
+  taxNumber: '',
+  vatNumber: '',
+  isDebtor: false,
+  isCreditor: false,
+  isActive: true,
+  notes: '',
+  contactPersons: []
+})
+
+const emptyContactPerson = () => ({
+  salutation: null,
+  title: '',
+  firstName: '',
+  lastName: '',
+  position: '',
+  department: '',
+  phone: '',
+  mobile: '',
+  email: '',
+  isPrimary: false
+})
+
+onMounted(() => {
+  loadContacts()
+})
+
+const loadContacts = async () => {
+  loading.value = true
+  try {
+    // API-Filter Parameter aufbauen
+    let url = '/api/contacts'
+    const params = new URLSearchParams()
+    
+    if (typeFilter.value === 'debtor') {
+      params.append('isDebtor', 'true')
+    } else if (typeFilter.value === 'creditor') {
+      params.append('isCreditor', 'true')
+    }
+    
+    if (params.toString()) {
+      url += '?' + params.toString()
+    }
+    
+    const response = await fetch(url, {
+      credentials: 'include'
+    })
+    if (!response.ok) throw new Error('Fehler beim Laden der Kontakte')
+    const data = await response.json()
+    
+    // API Platform gibt member zurück
+    contacts.value = data.member || []
+    
+    console.log('Loaded contacts:', contacts.value.length, 'with filter:', typeFilter.value)
+  } catch (error) {
+    console.error('Error loading contacts:', error)
+    toast.add({
+      severity: 'error',
+      summary: 'Fehler',
+      detail: 'Kontakte konnten nicht geladen werden',
+      life: 3000
+    })
+  } finally {
+    loading.value = false
+  }
+}
+
+const filterByType = (type) => {
+  typeFilter.value = type
+  loadContacts()
+}
+
+const openNewContactDialog = () => {
+  editingContact.value = emptyContact()
+  submitted.value = false
+  contactDialog.value = true
+}
+
+const editContact = (contact) => {
+  editingContact.value = { ...contact }
+  // Ensure contactPersons is initialized
+  if (!editingContact.value.contactPersons) {
+    editingContact.value.contactPersons = []
+  }
+  submitted.value = false
+  contactDialog.value = true
+}
+
+const hideDialog = () => {
+  contactDialog.value = false
+  submitted.value = false
+  editingContact.value = null
+}
+
+const addContactPerson = () => {
+  if (editingContact.value.contactPersons.length < 2) {
+    editingContact.value.contactPersons.push(emptyContactPerson())
+  }
+}
+
+const removeContactPerson = (index) => {
+  editingContact.value.contactPersons.splice(index, 1)
+}
+
+const validateContact = () => {
+  if (!editingContact.value.companyName) {
+    return false
+  }
+  
+  // Validate contact persons
+  for (const person of editingContact.value.contactPersons) {
+    if (!person.firstName || !person.lastName) {
+      return false
+    }
+  }
+  
+  return true
+}
+
+const saveContact = async () => {
+  submitted.value = true
+  
+  if (!validateContact()) {
+    toast.add({
+      severity: 'warn',
+      summary: 'Validierung fehlgeschlagen',
+      detail: 'Bitte füllen Sie alle Pflichtfelder aus',
+      life: 3000
+    })
+    return
+  }
+
+  saving.value = true
+  try {
+    const url = editingContact.value.id
+      ? `/api/contacts/${editingContact.value.id}`
+      : '/api/contacts'
+    
+    const method = editingContact.value.id ? 'PUT' : 'POST'
+    
+    const response = await fetch(url, {
+      method,
+      headers: {
+        'Content-Type': 'application/json'
+      },
+      credentials: 'include',
+      body: JSON.stringify(editingContact.value)
+    })
+
+    if (!response.ok) {
+      const error = await response.json()
+      throw new Error(error.message || 'Fehler beim Speichern')
+    }
+
+    toast.add({
+      severity: 'success',
+      summary: 'Erfolg',
+      detail: 'Kontakt wurde gespeichert',
+      life: 3000
+    })
+
+    hideDialog()
+    loadContacts()
+  } catch (error) {
+    console.error('Error saving contact:', error)
+    toast.add({
+      severity: 'error',
+      summary: 'Fehler',
+      detail: error.message || 'Kontakt konnte nicht gespeichert werden',
+      life: 3000
+    })
+  } finally {
+    saving.value = false
+  }
+}
+
+const confirmDelete = (contact) => {
+  editingContact.value = contact
+  deleteDialog.value = true
+}
+
+const deleteContact = async () => {
+  deleting.value = true
+  try {
+    const response = await fetch(`/api/contacts/${editingContact.value.id}`, {
+      method: 'DELETE',
+      credentials: 'include'
+    })
+
+    if (!response.ok) throw new Error('Fehler beim Löschen')
+
+    toast.add({
+      severity: 'success',
+      summary: 'Erfolg',
+      detail: 'Kontakt wurde gelöscht',
+      life: 3000
+    })
+
+    deleteDialog.value = false
+    editingContact.value = null
+    loadContacts()
+  } catch (error) {
+    console.error('Error deleting contact:', error)
+    toast.add({
+      severity: 'error',
+      summary: 'Fehler',
+      detail: 'Kontakt konnte nicht gelöscht werden',
+      life: 3000
+    })
+  } finally {
+    deleting.value = false
+  }
+}
+</script>
+
+<style scoped>
+.contact-management {
+  padding: 1rem;
+}
+
+.p-invalid {
+  border-color: var(--red-500);
+}
+
+.p-error {
+  color: var(--red-500);
+  font-size: 0.875rem;
+}
+</style>
diff --git a/assets/styles/app.css b/assets/styles/app.css
deleted file mode 100644
index dd6181a..0000000
--- a/assets/styles/app.css
+++ /dev/null
@@ -1,3 +0,0 @@
-body {
-    background-color: skyblue;
-}
diff --git a/assets/styles/app.scss b/assets/styles/app.scss
deleted file mode 100644
index 7c5f505..0000000
--- a/assets/styles/app.scss
+++ /dev/null
@@ -1,145 +0,0 @@
-/* Global styles for myCRM */
-
-* {
-  box-sizing: border-box;
-}
-
-body {
-  margin: 0;
-  font-family: -apple-system, BlinkMacSystemFont, 'Segoe UI', Roboto, 'Helvetica Neue', Arial, sans-serif;
-  -webkit-font-smoothing: antialiased;
-  -moz-osx-font-smoothing: grayscale;
-  background: #f9fafb;
-  color: #1f2937;
-  overflow-x: hidden;
-}
-
-#app {
-  width: 100%;
-  min-height: 100vh;
-}
-
-/* PrimeVue Component Styling Fixes */
-.p-card {
-  background: white;
-  border-radius: 8px;
-  box-shadow: 0 1px 3px rgba(0, 0, 0, 0.1);
-  
-  .p-card-title {
-    color: #1f2937;
-    font-weight: 600;
-    font-size: 1rem;
-    
-    @media (min-width: 768px) {
-      font-size: 1.125rem;
-    }
-  }
-  
-  .p-card-content {
-    color: #4b5563;
-    font-size: 0.875rem;
-    
-    @media (min-width: 768px) {
-      font-size: 1rem;
-    }
-  }
-}
-
-.p-datatable {
-  .p-datatable-header {
-    background: white;
-    border: 1px solid #e5e7eb;
-  }
-  
-  .p-datatable-thead > tr > th {
-    background: #f9fafb;
-    color: #374151;
-    border: 1px solid #e5e7eb;
-    font-weight: 600;
-  }
-  
-  .p-datatable-tbody > tr {
-    background: white;
-    color: #1f2937;
-    
-    &:hover {
-      background: #f9fafb;
-    }
-    
-    > td {
-      border: 1px solid #e5e7eb;
-    }
-  }
-}
-
-.p-button {
-  &.p-button-info {
-    background: #3b82f6;
-    border-color: #3b82f6;
-    
-    &:hover {
-      background: #2563eb;
-      border-color: #2563eb;
-    }
-  }
-  
-  &.p-button-danger {
-    background: #ef4444;
-    border-color: #ef4444;
-    
-    &:hover {
-      background: #dc2626;
-      border-color: #dc2626;
-    }
-  }
-}
-
-.p-dialog {
-  .p-dialog-header {
-    background: white;
-    color: #1f2937;
-  }
-  
-  .p-dialog-content {
-    background: white;
-    color: #1f2937;
-  }
-}
-
-.p-inputtext {
-  background: white;
-  color: #1f2937;
-  border: 1px solid #d1d5db;
-  
-  &:enabled:focus {
-    border-color: #3b82f6;
-    box-shadow: 0 0 0 0.2rem rgba(59, 130, 246, 0.25);
-  }
-}
-
-.p-checkbox {
-  .p-checkbox-box {
-    background: white;
-    border: 1px solid #d1d5db;
-    
-    &.p-highlight {
-      background: #3b82f6;
-      border-color: #3b82f6;
-    }
-  }
-}
-
-.p-tag {
-  &.p-tag-success {
-    background: #10b981;
-  }
-  
-  &.p-tag-danger {
-    background: #ef4444;
-  }
-  
-  &.p-tag-info {
-    background: #93c5fd;
-    color: #1e3a8a;
-  }
-}
diff --git a/assets/styles/layout/_animations.scss b/assets/styles/layout/_animations.scss
new file mode 100644
index 0000000..01bb16a
--- /dev/null
+++ b/assets/styles/layout/_animations.scss
@@ -0,0 +1,29 @@
+// Animation keyframes for StyleClass directive
+@keyframes scalein {
+    0% {
+        opacity: 0;
+        transform: scaleY(0.8);
+        transition: transform 0.12s cubic-bezier(0, 0, 0.2, 1), opacity 0.12s cubic-bezier(0, 0, 0.2, 1);
+    }
+    100% {
+        opacity: 1;
+        transform: scaleY(1);
+    }
+}
+
+@keyframes fadeout {
+    0% {
+        opacity: 1;
+    }
+    100% {
+        opacity: 0;
+    }
+}
+
+.animate-scalein {
+    animation: scalein 0.15s linear;
+}
+
+.animate-fadeout {
+    animation: fadeout 0.15s linear;
+}
diff --git a/assets/styles/layout/_core.scss b/assets/styles/layout/_core.scss
new file mode 100644
index 0000000..672a6bf
--- /dev/null
+++ b/assets/styles/layout/_core.scss
@@ -0,0 +1,24 @@
+html {
+    height: 100%;
+    font-size: 14px;
+    line-height: 1.2;
+}
+
+body {
+    font-family: 'Lato', sans-serif;
+    color: var(--text-color);
+    background-color: var(--surface-ground);
+    margin: 0;
+    padding: 0;
+    min-height: 100%;
+    -webkit-font-smoothing: antialiased;
+    -moz-osx-font-smoothing: grayscale;
+}
+
+a {
+    text-decoration: none;
+}
+
+.layout-wrapper {
+    min-height: 100vh;
+}
diff --git a/assets/styles/layout/_footer.scss b/assets/styles/layout/_footer.scss
new file mode 100644
index 0000000..27bcbf0
--- /dev/null
+++ b/assets/styles/layout/_footer.scss
@@ -0,0 +1,8 @@
+.layout-footer {
+    display: flex;
+    align-items: center;
+    justify-content: center;
+    padding: 1rem 0 1rem 0;
+    gap: 0.5rem;
+    border-top: 1px solid var(--surface-border);
+}
diff --git a/assets/styles/layout/_main.scss b/assets/styles/layout/_main.scss
new file mode 100644
index 0000000..a223ac1
--- /dev/null
+++ b/assets/styles/layout/_main.scss
@@ -0,0 +1,13 @@
+.layout-main-container {
+    display: flex;
+    flex-direction: column;
+    min-height: 100vh;
+    justify-content: space-between;
+    padding: 6rem 2rem 0 2rem;
+    transition: margin-left var(--layout-section-transition-duration);
+}
+
+.layout-main {
+    flex: 1 1 auto;
+    padding-bottom: 2rem;
+}
diff --git a/assets/styles/layout/_menu.scss b/assets/styles/layout/_menu.scss
new file mode 100644
index 0000000..3d22fb5
--- /dev/null
+++ b/assets/styles/layout/_menu.scss
@@ -0,0 +1,160 @@
+@use 'mixins' as *;
+
+.layout-sidebar {
+    position: fixed;
+    width: 20rem;
+    height: calc(100vh - 8rem);
+    z-index: 999;
+    overflow-y: auto;
+    user-select: none;
+    top: 6rem;
+    left: 2rem;
+    transition:
+        transform var(--layout-section-transition-duration),
+        left var(--layout-section-transition-duration);
+    background-color: var(--surface-overlay);
+    border-radius: var(--content-border-radius);
+    padding: 0.5rem 1.5rem;
+}
+
+.layout-menu {
+    margin: 0;
+    padding: 0;
+    list-style-type: none;
+
+    .layout-root-menuitem {
+        > .layout-menuitem-root-text {
+            font-size: 0.857rem;
+            text-transform: uppercase;
+            font-weight: 700;
+            color: var(--text-color);
+            margin: 0.75rem 0;
+        }
+
+        > a {
+            display: none;
+        }
+    }
+
+    a {
+        user-select: none;
+
+        &.active-menuitem {
+            > .layout-submenu-toggler {
+                transform: rotate(-180deg);
+            }
+        }
+    }
+
+    li.active-menuitem {
+        > a {
+            .layout-submenu-toggler {
+                transform: rotate(-180deg);
+            }
+        }
+    }
+
+    ul {
+        margin: 0;
+        padding: 0;
+        list-style-type: none;
+
+        a {
+            display: flex;
+            align-items: center;
+            position: relative;
+            outline: 0 none;
+            color: var(--text-color);
+            cursor: pointer;
+            padding: 0.75rem 1rem;
+            border-radius: var(--content-border-radius);
+            transition:
+                background-color var(--element-transition-duration),
+                box-shadow var(--element-transition-duration);
+
+            .layout-menuitem-icon {
+                margin-right: 0.5rem;
+            }
+
+            .layout-submenu-toggler {
+                font-size: 75%;
+                margin-left: auto;
+                transition: transform var(--element-transition-duration);
+            }
+
+            &.active-route {
+                font-weight: 700;
+                color: var(--primary-color);
+            }
+
+            &:hover {
+                background-color: var(--surface-hover);
+            }
+
+            &:focus {
+                @include focused-inset();
+            }
+        }
+
+        ul {
+            overflow: hidden;
+            border-radius: var(--content-border-radius);
+
+            li {
+                a {
+                    margin-left: 1rem;
+                }
+
+                li {
+                    a {
+                        margin-left: 2rem;
+                    }
+
+                    li {
+                        a {
+                            margin-left: 2.5rem;
+                        }
+
+                        li {
+                            a {
+                                margin-left: 3rem;
+                            }
+
+                            li {
+                                a {
+                                    margin-left: 3.5rem;
+                                }
+
+                                li {
+                                    a {
+                                        margin-left: 4rem;
+                                    }
+                                }
+                            }
+                        }
+                    }
+                }
+            }
+        }
+    }
+}
+
+.layout-submenu-enter-from,
+.layout-submenu-leave-to {
+    max-height: 0;
+}
+
+.layout-submenu-enter-to,
+.layout-submenu-leave-from {
+    max-height: 1000px;
+}
+
+.layout-submenu-leave-active {
+    overflow: hidden;
+    transition: max-height 0.45s cubic-bezier(0, 1, 0, 1);
+}
+
+.layout-submenu-enter-active {
+    overflow: hidden;
+    transition: max-height 1s ease-in-out;
+}
diff --git a/assets/styles/layout/_mixins.scss b/assets/styles/layout/_mixins.scss
new file mode 100644
index 0000000..ad330b1
--- /dev/null
+++ b/assets/styles/layout/_mixins.scss
@@ -0,0 +1,15 @@
+@mixin focused() {
+    outline-width: var(--focus-ring-width);
+    outline-style: var(--focus-ring-style);
+    outline-color: var(--focus-ring-color);
+    outline-offset: var(--focus-ring-offset);
+    box-shadow: var(--focus-ring-shadow);
+    transition:
+        box-shadow var(--transition-duration),
+        outline-color var(--transition-duration);
+}
+
+@mixin focused-inset() {
+    outline-offset: -1px;
+    box-shadow: inset var(--focus-ring-shadow);
+}
diff --git a/assets/styles/layout/_preloading.scss b/assets/styles/layout/_preloading.scss
new file mode 100644
index 0000000..a814104
--- /dev/null
+++ b/assets/styles/layout/_preloading.scss
@@ -0,0 +1,47 @@
+.preloader {
+    position: fixed;
+    z-index: 999999;
+    background: #edf1f5;
+    width: 100%;
+    height: 100%;
+}
+.preloader-content {
+    border: 0 solid transparent;
+    border-radius: 50%;
+    width: 150px;
+    height: 150px;
+    position: absolute;
+    top: calc(50vh - 75px);
+    left: calc(50vw - 75px);
+}
+
+.preloader-content:before, .preloader-content:after{
+    content: '';
+    border: 1em solid var(--primary-color);
+    border-radius: 50%;
+    width: inherit;
+    height: inherit;
+    position: absolute;
+    top: 0;
+    left: 0;
+    animation: loader 2s linear infinite;
+    opacity: 0;
+}
+
+.preloader-content:before{
+    animation-delay: 0.5s;
+}
+
+@keyframes loader{
+    0%{
+        transform: scale(0);
+        opacity: 0;
+    }
+    50%{
+        opacity: 1;
+    }
+    100%{
+        transform: scale(1);
+        opacity: 0;
+    }
+}
diff --git a/assets/styles/layout/_responsive.scss b/assets/styles/layout/_responsive.scss
new file mode 100644
index 0000000..561d5f1
--- /dev/null
+++ b/assets/styles/layout/_responsive.scss
@@ -0,0 +1,110 @@
+@media screen and (min-width: 1960px) {
+    .layout-main,
+    .landing-wrapper {
+        width: 1504px;
+        margin-left: auto !important;
+        margin-right: auto !important;
+    }
+}
+
+@media (min-width: 992px) {
+    .layout-wrapper {
+        &.layout-overlay {
+            .layout-main-container {
+                margin-left: 0;
+                padding-left: 2rem;
+            }
+
+            .layout-sidebar {
+                transform: translateX(-100%);
+                left: 0;
+                top: 0;
+                height: 100vh;
+                border-top-left-radius: 0;
+                border-bottom-left-radius: 0;
+                border-right: 1px solid var(--surface-border);
+                transition:
+                    transform 0.4s cubic-bezier(0.05, 0.74, 0.2, 0.99),
+                    left 0.4s cubic-bezier(0.05, 0.74, 0.2, 0.99);
+                box-shadow:
+                    0px 3px 5px rgba(0, 0, 0, 0.02),
+                    0px 0px 2px rgba(0, 0, 0, 0.05),
+                    0px 1px 4px rgba(0, 0, 0, 0.08);
+            }
+
+            &.layout-overlay-active {
+                .layout-sidebar {
+                    transform: translateX(0);
+                }
+            }
+        }
+
+        &.layout-static {
+            .layout-main-container {
+                margin-left: 22rem;
+            }
+
+            &.layout-static-inactive {
+                .layout-sidebar {
+                    transform: translateX(-100%);
+                    left: 0;
+                }
+
+                .layout-main-container {
+                    margin-left: 0;
+                    padding-left: 2rem;
+                }
+            }
+        }
+
+        .layout-mask {
+            display: none;
+        }
+    }
+}
+
+@media (max-width: 991px) {
+    .blocked-scroll {
+        overflow: hidden;
+    }
+
+    .layout-wrapper {
+        .layout-main-container {
+            margin-left: 0;
+            padding-left: 2rem;
+        }
+
+        .layout-sidebar {
+            transform: translateX(-100%);
+            left: 0;
+            top: 0;
+            height: 100vh;
+            border-top-left-radius: 0;
+            border-bottom-left-radius: 0;
+            transition:
+                transform 0.4s cubic-bezier(0.05, 0.74, 0.2, 0.99),
+                left 0.4s cubic-bezier(0.05, 0.74, 0.2, 0.99);
+        }
+
+        .layout-mask {
+            display: none;
+            position: fixed;
+            top: 0;
+            left: 0;
+            z-index: 998;
+            width: 100%;
+            height: 100%;
+            background-color: var(--maskbg);
+        }
+
+        &.layout-mobile-active {
+            .layout-sidebar {
+                transform: translateX(0);
+            }
+
+            .layout-mask {
+                display: block;
+            }
+        }
+    }
+}
diff --git a/assets/styles/layout/_topbar.scss b/assets/styles/layout/_topbar.scss
new file mode 100644
index 0000000..b8e34b3
--- /dev/null
+++ b/assets/styles/layout/_topbar.scss
@@ -0,0 +1,201 @@
+@use 'mixins' as *;
+
+.layout-topbar {
+    position: fixed;
+    height: 4rem;
+    z-index: 997;
+    left: 0;
+    top: 0;
+    width: 100%;
+    padding: 0 2rem;
+    background-color: var(--surface-card);
+    transition: left var(--layout-section-transition-duration);
+    display: flex;
+    align-items: center;
+
+    .layout-topbar-logo-container {
+        width: 20rem;
+        display: flex;
+        align-items: center;
+    }
+
+    .layout-topbar-logo {
+        display: inline-flex;
+        align-items: center;
+        font-size: 1.5rem;
+        border-radius: var(--content-border-radius);
+        color: var(--text-color);
+        font-weight: 500;
+        gap: 0.5rem;
+
+        svg {
+            width: 3rem;
+        }
+
+        &:focus-visible {
+            @include focused();
+        }
+    }
+
+    .layout-topbar-action {
+        display: inline-flex;
+        justify-content: center;
+        align-items: center;
+        border-radius: 50%;
+        width: 2.5rem;
+        height: 2.5rem;
+        color: var(--text-color);
+        transition: background-color var(--element-transition-duration);
+        cursor: pointer;
+
+        &:hover {
+            background-color: var(--surface-hover);
+        }
+
+        &:focus-visible {
+            @include focused();
+        }
+
+        i {
+            font-size: 1.25rem;
+        }
+
+        span {
+            font-size: 1rem;
+            display: none;
+        }
+
+        &.layout-topbar-action-highlight {
+            background-color: var(--primary-color);
+            color: var(--primary-contrast-color);
+        }
+    }
+
+    .layout-menu-button {
+        margin-right: 0.5rem;
+    }
+
+    .layout-topbar-menu-button {
+        display: none;
+    }
+
+    .layout-topbar-actions {
+        margin-left: auto;
+        display: flex;
+        gap: 1rem;
+    }
+
+    .layout-topbar-menu-content {
+        display: flex;
+        gap: 1rem;
+    }
+
+    .layout-config-menu {
+        display: flex;
+        gap: 1rem;
+    }
+}
+
+@media (max-width: 991px) {
+    .layout-topbar {
+        padding: 0 2rem;
+
+        .layout-topbar-logo-container {
+            width: auto;
+        }
+
+        .layout-menu-button {
+            margin-left: 0;
+            margin-right: 0.5rem;
+        }
+
+        .layout-topbar-menu-button {
+            display: inline-flex;
+        }
+
+        .layout-topbar-menu {
+            position: absolute;
+            background-color: var(--surface-overlay);
+            transform-origin: top;
+            box-shadow:
+                0px 3px 5px rgba(0, 0, 0, 0.02),
+                0px 0px 2px rgba(0, 0, 0, 0.05),
+                0px 1px 4px rgba(0, 0, 0, 0.08);
+            border-radius: var(--content-border-radius);
+            padding: 1rem;
+            right: 2rem;
+            top: 4rem;
+            min-width: 15rem;
+            border: 1px solid var(--surface-border);
+
+            .layout-topbar-menu-content {
+                gap: 0.5rem;
+            }
+
+            .layout-topbar-action {
+                display: flex;
+                width: 100%;
+                height: auto;
+                justify-content: flex-start;
+                border-radius: var(--content-border-radius);
+                padding: 0.5rem 1rem;
+
+                i {
+                    font-size: 1rem;
+                    margin-right: 0.5rem;
+                }
+
+                span {
+                    font-weight: medium;
+                    display: block;
+                }
+            }
+        }
+
+        .layout-topbar-menu-content {
+            flex-direction: column;
+        }
+    }
+}
+
+.config-panel {
+    .config-panel-label {
+        font-size: 0.875rem;
+        color: var(--text-secondary-color);
+        font-weight: 600;
+        line-height: 1;
+    }
+
+    .config-panel-colors {
+        > div {
+            padding-top: 0.5rem;
+            display: flex;
+            gap: 0.5rem;
+            flex-wrap: wrap;
+            justify-content: space-between;
+
+            button {
+                border: none;
+                width: 1.25rem;
+                height: 1.25rem;
+                border-radius: 50%;
+                padding: 0;
+                cursor: pointer;
+                outline-color: transparent;
+                outline-width: 2px;
+                outline-style: solid;
+                outline-offset: 1px;
+
+                &.active-color {
+                    outline-color: var(--primary-color);
+                }
+            }
+        }
+    }
+
+    .config-panel-settings {
+        display: flex;
+        flex-direction: column;
+        gap: 0.5rem;
+    }
+}
diff --git a/assets/styles/layout/_typography.scss b/assets/styles/layout/_typography.scss
new file mode 100644
index 0000000..b17bbc2
--- /dev/null
+++ b/assets/styles/layout/_typography.scss
@@ -0,0 +1,68 @@
+h1,
+h2,
+h3,
+h4,
+h5,
+h6 {
+    margin: 1.5rem 0 1rem 0;
+    font-family: inherit;
+    font-weight: 700;
+    line-height: 1.5;
+    color: var(--text-color);
+
+    &:first-child {
+        margin-top: 0;
+    }
+}
+
+h1 {
+    font-size: 2.5rem;
+}
+
+h2 {
+    font-size: 2rem;
+}
+
+h3 {
+    font-size: 1.75rem;
+}
+
+h4 {
+    font-size: 1.5rem;
+}
+
+h5 {
+    font-size: 1.25rem;
+}
+
+h6 {
+    font-size: 1rem;
+}
+
+mark {
+    background: #fff8e1;
+    padding: 0.25rem 0.4rem;
+    border-radius: var(--content-border-radius);
+    font-family: monospace;
+}
+
+blockquote {
+    margin: 1rem 0;
+    padding: 0 2rem;
+    border-left: 4px solid #90a4ae;
+}
+
+hr {
+    border-top: solid var(--surface-border);
+    border-width: 1px 0 0 0;
+    margin: 1rem 0;
+}
+
+p {
+    margin: 0 0 1rem 0;
+    line-height: 1.5;
+
+    &:last-child {
+        margin-bottom: 0;
+    }
+}
diff --git a/assets/styles/layout/_utils.scss b/assets/styles/layout/_utils.scss
new file mode 100644
index 0000000..6ccec88
--- /dev/null
+++ b/assets/styles/layout/_utils.scss
@@ -0,0 +1,25 @@
+/* Utils */
+.clearfix:after {
+    content: ' ';
+    display: block;
+    clear: both;
+}
+
+.card {
+    background: var(--surface-card);
+    padding: 2rem;
+    margin-bottom: 2rem;
+    border-radius: var(--content-border-radius);
+
+    &:last-child {
+        margin-bottom: 0;
+    }
+}
+
+.p-toast {
+    &.p-toast-top-right,
+    &.p-toast-top-left,
+    &.p-toast-top-center {
+        top: 100px;
+    }
+}
diff --git a/assets/styles/layout/layout.scss b/assets/styles/layout/layout.scss
new file mode 100644
index 0000000..70a04ef
--- /dev/null
+++ b/assets/styles/layout/layout.scss
@@ -0,0 +1,14 @@
+@use './variables/_common';
+@use './variables/_light';
+@use './variables/_dark';
+@use './_mixins';
+@use './_animations';
+@use './_preloading';
+@use './_core';
+@use './_main';
+@use './_topbar';
+@use './_menu';
+@use './_footer';
+@use './_responsive';
+@use './_utils';
+@use './_typography';
diff --git a/assets/styles/layout/variables/_common.scss b/assets/styles/layout/variables/_common.scss
new file mode 100644
index 0000000..2a040c2
--- /dev/null
+++ b/assets/styles/layout/variables/_common.scss
@@ -0,0 +1,20 @@
+:root {
+    --primary-color: var(--p-primary-color);
+    --primary-contrast-color: var(--p-primary-contrast-color);
+    --text-color: var(--p-text-color);
+    --text-color-secondary: var(--p-text-muted-color);
+    --surface-border: var(--p-content-border-color);
+    --surface-card: var(--p-content-background);
+    --surface-hover: var(--p-content-hover-background);
+    --surface-overlay: var(--p-overlay-popover-background);
+    --transition-duration: var(--p-transition-duration);
+    --maskbg: var(--p-mask-background);
+    --content-border-radius: var(--p-content-border-radius);
+    --layout-section-transition-duration: 0.2s;
+    --element-transition-duration: var(--p-transition-duration);
+    --focus-ring-width: var(--p-focus-ring-width);
+    --focus-ring-style: var(--p-focus-ring-style);
+    --focus-ring-color: var(--p-focus-ring-color);
+    --focus-ring-offset: var(--p-focus-ring-offset);
+    --focus-ring-shadow: var(--p-focus-ring-shadow);
+}
diff --git a/assets/styles/layout/variables/_dark.scss b/assets/styles/layout/variables/_dark.scss
new file mode 100644
index 0000000..bb91605
--- /dev/null
+++ b/assets/styles/layout/variables/_dark.scss
@@ -0,0 +1,5 @@
+:root[class*='app-dark'] {
+    --surface-ground: var(--p-surface-950);
+    --code-background: var(--p-surface-800);
+    --code-color: var(--p-surface-100);
+}
diff --git a/assets/styles/layout/variables/_light.scss b/assets/styles/layout/variables/_light.scss
new file mode 100644
index 0000000..aa3403c
--- /dev/null
+++ b/assets/styles/layout/variables/_light.scss
@@ -0,0 +1,5 @@
+:root {
+    --surface-ground: var(--p-surface-100);
+    --code-background: var(--p-surface-900);
+    --code-color: var(--p-surface-200);
+}
diff --git a/assets/styles/sakai.scss b/assets/styles/sakai.scss
new file mode 100644
index 0000000..c015b7e
--- /dev/null
+++ b/assets/styles/sakai.scss
@@ -0,0 +1,3 @@
+/* Sakai Layout Styles */
+@import 'primeicons/primeicons.css';
+@import './layout/layout.scss';
diff --git a/assets/styles/tailwind.css b/assets/styles/tailwind.css
new file mode 100644
index 0000000..8340fce
--- /dev/null
+++ b/assets/styles/tailwind.css
@@ -0,0 +1,32 @@
+@import 'tailwindcss';
+
+@plugin 'tailwindcss-primeui';
+
+@custom-variant dark (&:where([class*="app-dark"], [class*="app-dark"] *));
+
+@theme {
+  --breakpoint-*: initial;
+  --breakpoint-sm: 576px;
+  --breakpoint-md: 768px;
+  --breakpoint-lg: 992px;
+  --breakpoint-xl: 1200px;
+  --breakpoint-2xl: 1920px;
+}
+
+/*
+  The default border color has changed to `currentcolor` in Tailwind CSS v4,
+  so we've added these compatibility styles to make sure everything still
+  looks the same as it did with Tailwind CSS v3.
+
+  If we ever want to remove these styles, we need to add an explicit border
+  color utility to any element that depends on these defaults.
+*/
+@layer base {
+  *,
+  ::after,
+  ::before,
+  ::backdrop,
+  ::file-selector-button {
+    border-color: var(--color-gray-200, currentcolor);
+  }
+}
diff --git a/composer.json b/composer.json
index cddec76..da19a41 100644
--- a/composer.json
+++ b/composer.json
@@ -103,7 +103,7 @@
         }
     },
     "require-dev": {
-        "doctrine/doctrine-fixtures-bundle": "^4.3",
+        "doctrine/doctrine-fixtures-bundle": "*",
         "phpunit/phpunit": "^12.4",
         "symfony/browser-kit": "7.1.*",
         "symfony/css-selector": "7.1.*",
diff --git a/composer.lock b/composer.lock
index 8ea500f..e288264 100644
--- a/composer.lock
+++ b/composer.lock
@@ -4,7 +4,7 @@
         "Read more about it at https://getcomposer.org/doc/01-basic-usage.md#installing-dependencies",
         "This file is @generated automatically"
     ],
-    "content-hash": "10b55ae5547ef383b9e8a94a7ca7402c",
+    "content-hash": "af57c523401fba0e523501b76e0629f0",
     "packages": [
         {
             "name": "api-platform/core",
diff --git a/migrations/Version20251108175514.php b/migrations/Version20251108175514.php
new file mode 100644
index 0000000..0ea45b8
--- /dev/null
+++ b/migrations/Version20251108175514.php
@@ -0,0 +1,35 @@
+<?php
+
+declare(strict_types=1);
+
+namespace DoctrineMigrations;
+
+use Doctrine\DBAL\Schema\Schema;
+use Doctrine\Migrations\AbstractMigration;
+
+/**
+ * Auto-generated Migration: Please modify to your needs!
+ */
+final class Version20251108175514 extends AbstractMigration
+{
+    public function getDescription(): string
+    {
+        return '';
+    }
+
+    public function up(Schema $schema): void
+    {
+        // this up() migration is auto-generated, please modify it to your needs
+        $this->addSql('CREATE TABLE contact_persons (id INT AUTO_INCREMENT NOT NULL, contact_id INT NOT NULL, salutation VARCHAR(20) DEFAULT NULL, title VARCHAR(100) DEFAULT NULL, first_name VARCHAR(100) NOT NULL, last_name VARCHAR(100) NOT NULL, position VARCHAR(100) DEFAULT NULL, department VARCHAR(100) DEFAULT NULL, phone VARCHAR(50) DEFAULT NULL, mobile VARCHAR(50) DEFAULT NULL, email VARCHAR(180) DEFAULT NULL, is_primary TINYINT(1) NOT NULL, INDEX IDX_3873E652E7A1254A (contact_id), PRIMARY KEY(id)) DEFAULT CHARACTER SET utf8mb4 COLLATE `utf8mb4_unicode_ci` ENGINE = InnoDB');
+        $this->addSql('CREATE TABLE contacts (id INT AUTO_INCREMENT NOT NULL, company_name VARCHAR(255) NOT NULL, company_number VARCHAR(50) DEFAULT NULL, street LONGTEXT DEFAULT NULL, zip_code VARCHAR(20) DEFAULT NULL, city VARCHAR(100) DEFAULT NULL, country VARCHAR(100) DEFAULT NULL, phone VARCHAR(50) DEFAULT NULL, fax VARCHAR(50) DEFAULT NULL, email VARCHAR(180) DEFAULT NULL, website VARCHAR(255) DEFAULT NULL, tax_number VARCHAR(50) DEFAULT NULL, vat_number VARCHAR(50) DEFAULT NULL, is_debtor TINYINT(1) NOT NULL, is_creditor TINYINT(1) NOT NULL, is_active TINYINT(1) NOT NULL, notes LONGTEXT DEFAULT NULL, created_at DATETIME NOT NULL COMMENT \'(DC2Type:datetime_immutable)\', updated_at DATETIME DEFAULT NULL COMMENT \'(DC2Type:datetime_immutable)\', PRIMARY KEY(id)) DEFAULT CHARACTER SET utf8mb4 COLLATE `utf8mb4_unicode_ci` ENGINE = InnoDB');
+        $this->addSql('ALTER TABLE contact_persons ADD CONSTRAINT FK_3873E652E7A1254A FOREIGN KEY (contact_id) REFERENCES contacts (id) ON DELETE CASCADE');
+    }
+
+    public function down(Schema $schema): void
+    {
+        // this down() migration is auto-generated, please modify it to your needs
+        $this->addSql('ALTER TABLE contact_persons DROP FOREIGN KEY FK_3873E652E7A1254A');
+        $this->addSql('DROP TABLE contact_persons');
+        $this->addSql('DROP TABLE contacts');
+    }
+}
diff --git a/package-lock.json b/package-lock.json
index 914db89..f1234f6 100644
--- a/package-lock.json
+++ b/package-lock.json
@@ -8,7 +8,6 @@
             "dependencies": {
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-                "primeflex": "^3.3.1",
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@@ -17,18 +16,36 @@
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                 "@symfony/webpack-encore": "^5.1.0",
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+                "@tailwindcss/vite": "^4.1.17",
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                 "core-js": "^3.38.0",
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                 "sass": "^1.70.0",
                 "sass-loader": "^16.0.0",
+                "tailwindcss": "^4.1.17",
+                "tailwindcss-primeui": "^0.6.1",
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                 "webpack": "^5.74.0",
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@@ -4568,6 +6061,16 @@
             "dev": true,
             "license": "MIT"
         },
+        "node_modules/normalize-range": {
+            "version": "0.1.2",
+            "resolved": "https://registry.npmjs.org/normalize-range/-/normalize-range-0.1.2.tgz",
+            "integrity": "sha512-bdok/XvKII3nUpklnV6P2hxtMNrCboOjAcyBuQnWEhO665FwrSNRxU+AqpsyvO6LgGYPspN+lu5CLtw4jPRKNA==",
+            "dev": true,
+            "license": "MIT",
+            "engines": {
+                "node": ">=0.10.0"
+            }
+        },
         "node_modules/nth-check": {
             "version": "2.1.1",
             "resolved": "https://registry.npmjs.org/nth-check/-/nth-check-2.1.1.tgz",
@@ -5399,12 +6902,6 @@
                 "renderkid": "^3.0.0"
             }
         },
-        "node_modules/primeflex": {
-            "version": "3.3.1",
-            "resolved": "https://registry.npmjs.org/primeflex/-/primeflex-3.3.1.tgz",
-            "integrity": "sha512-zaOq3YvcOYytbAmKv3zYc+0VNS9Wg5d37dfxZnveKBFPr7vEIwfV5ydrpiouTft8MVW6qNjfkaQphHSnvgQbpQ==",
-            "license": "MIT"
-        },
         "node_modules/primeicons": {
             "version": "7.0.0",
             "resolved": "https://registry.npmjs.org/primeicons/-/primeicons-7.0.0.tgz",
@@ -5638,6 +7135,49 @@
             "dev": true,
             "license": "MIT"
         },
+        "node_modules/rollup": {
+            "version": "4.53.1",
+            "resolved": "https://registry.npmjs.org/rollup/-/rollup-4.53.1.tgz",
+            "integrity": "sha512-n2I0V0lN3E9cxxMqBCT3opWOiQBzRN7UG60z/WDKqdX2zHUS/39lezBcsckZFsV6fUTSnfqI7kHf60jDAPGKug==",
+            "dev": true,
+            "license": "MIT",
+            "peer": true,
+            "dependencies": {
+                "@types/estree": "1.0.8"
+            },
+            "bin": {
+                "rollup": "dist/bin/rollup"
+            },
+            "engines": {
+                "node": ">=18.0.0",
+                "npm": ">=8.0.0"
+            },
+            "optionalDependencies": {
+                "@rollup/rollup-android-arm-eabi": "4.53.1",
+                "@rollup/rollup-android-arm64": "4.53.1",
+                "@rollup/rollup-darwin-arm64": "4.53.1",
+                "@rollup/rollup-darwin-x64": "4.53.1",
+                "@rollup/rollup-freebsd-arm64": "4.53.1",
+                "@rollup/rollup-freebsd-x64": "4.53.1",
+                "@rollup/rollup-linux-arm-gnueabihf": "4.53.1",
+                "@rollup/rollup-linux-arm-musleabihf": "4.53.1",
+                "@rollup/rollup-linux-arm64-gnu": "4.53.1",
+                "@rollup/rollup-linux-arm64-musl": "4.53.1",
+                "@rollup/rollup-linux-loong64-gnu": "4.53.1",
+                "@rollup/rollup-linux-ppc64-gnu": "4.53.1",
+                "@rollup/rollup-linux-riscv64-gnu": "4.53.1",
+                "@rollup/rollup-linux-riscv64-musl": "4.53.1",
+                "@rollup/rollup-linux-s390x-gnu": "4.53.1",
+                "@rollup/rollup-linux-x64-gnu": "4.53.1",
+                "@rollup/rollup-linux-x64-musl": "4.53.1",
+                "@rollup/rollup-openharmony-arm64": "4.53.1",
+                "@rollup/rollup-win32-arm64-msvc": "4.53.1",
+                "@rollup/rollup-win32-ia32-msvc": "4.53.1",
+                "@rollup/rollup-win32-x64-gnu": "4.53.1",
+                "@rollup/rollup-win32-x64-msvc": "4.53.1",
+                "fsevents": "~2.3.2"
+            }
+        },
         "node_modules/safe-buffer": {
             "version": "5.2.1",
             "resolved": "https://registry.npmjs.org/safe-buffer/-/safe-buffer-5.2.1.tgz",
@@ -6038,6 +7578,23 @@
                 "url": "https://github.com/fb55/entities?sponsor=1"
             }
         },
+        "node_modules/tailwindcss": {
+            "version": "4.1.17",
+            "resolved": "https://registry.npmjs.org/tailwindcss/-/tailwindcss-4.1.17.tgz",
+            "integrity": "sha512-j9Ee2YjuQqYT9bbRTfTZht9W/ytp5H+jJpZKiYdP/bpnXARAuELt9ofP0lPnmHjbga7SNQIxdTAXCmtKVYjN+Q==",
+            "dev": true,
+            "license": "MIT"
+        },
+        "node_modules/tailwindcss-primeui": {
+            "version": "0.6.1",
+            "resolved": "https://registry.npmjs.org/tailwindcss-primeui/-/tailwindcss-primeui-0.6.1.tgz",
+            "integrity": "sha512-T69Rylcrmnt8zy9ik+qZvsLuRIrS9/k6rYJSIgZ1trnbEzGDDQSCIdmfyZknevqiHwpSJHSmQ9XT2C+S/hJY4A==",
+            "dev": true,
+            "license": "MIT",
+            "peerDependencies": {
+                "tailwindcss": ">=3.1.0"
+            }
+        },
         "node_modules/tapable": {
             "version": "2.3.0",
             "resolved": "https://registry.npmjs.org/tapable/-/tapable-2.3.0.tgz",
@@ -6154,6 +7711,57 @@
             "dev": true,
             "license": "MIT"
         },
+        "node_modules/tinyglobby": {
+            "version": "0.2.15",
+            "resolved": "https://registry.npmjs.org/tinyglobby/-/tinyglobby-0.2.15.tgz",
+            "integrity": "sha512-j2Zq4NyQYG5XMST4cbs02Ak8iJUdxRM0XI5QyxXuZOzKOINmWurp3smXu3y5wDcJrptwpSjgXHzIQxR0omXljQ==",
+            "dev": true,
+            "license": "MIT",
+            "peer": true,
+            "dependencies": {
+                "fdir": "^6.5.0",
+                "picomatch": "^4.0.3"
+            },
+            "engines": {
+                "node": ">=12.0.0"
+            },
+            "funding": {
+                "url": "https://github.com/sponsors/SuperchupuDev"
+            }
+        },
+        "node_modules/tinyglobby/node_modules/fdir": {
+            "version": "6.5.0",
+            "resolved": "https://registry.npmjs.org/fdir/-/fdir-6.5.0.tgz",
+            "integrity": "sha512-tIbYtZbucOs0BRGqPJkshJUYdL+SDH7dVM8gjy+ERp3WAUjLEFJE+02kanyHtwjWOnwrKYBiwAmM0p4kLJAnXg==",
+            "dev": true,
+            "license": "MIT",
+            "peer": true,
+            "engines": {
+                "node": ">=12.0.0"
+            },
+            "peerDependencies": {
+                "picomatch": "^3 || ^4"
+            },
+            "peerDependenciesMeta": {
+                "picomatch": {
+                    "optional": true
+                }
+            }
+        },
+        "node_modules/tinyglobby/node_modules/picomatch": {
+            "version": "4.0.3",
+            "resolved": "https://registry.npmjs.org/picomatch/-/picomatch-4.0.3.tgz",
+            "integrity": "sha512-5gTmgEY/sqK6gFXLIsQNH19lWb4ebPDLA4SdLP7dsWkIXHWlG66oPuVvXSGFPppYZz8ZDZq0dYYrbHfBCVUb1Q==",
+            "dev": true,
+            "license": "MIT",
+            "peer": true,
+            "engines": {
+                "node": ">=12"
+            },
+            "funding": {
+                "url": "https://github.com/sponsors/jonschlinkert"
+            }
+        },
         "node_modules/tmp": {
             "version": "0.2.5",
             "resolved": "https://registry.npmjs.org/tmp/-/tmp-0.2.5.tgz",
@@ -6274,6 +7882,115 @@
             "dev": true,
             "license": "MIT"
         },
+        "node_modules/vite": {
+            "version": "7.2.2",
+            "resolved": "https://registry.npmjs.org/vite/-/vite-7.2.2.tgz",
+            "integrity": "sha512-BxAKBWmIbrDgrokdGZH1IgkIk/5mMHDreLDmCJ0qpyJaAteP8NvMhkwr/ZCQNqNH97bw/dANTE9PDzqwJghfMQ==",
+            "dev": true,
+            "license": "MIT",
+            "peer": true,
+            "dependencies": {
+                "esbuild": "^0.25.0",
+                "fdir": "^6.5.0",
+                "picomatch": "^4.0.3",
+                "postcss": "^8.5.6",
+                "rollup": "^4.43.0",
+                "tinyglobby": "^0.2.15"
+            },
+            "bin": {
+                "vite": "bin/vite.js"
+            },
+            "engines": {
+                "node": "^20.19.0 || >=22.12.0"
+            },
+            "funding": {
+                "url": "https://github.com/vitejs/vite?sponsor=1"
+            },
+            "optionalDependencies": {
+                "fsevents": "~2.3.3"
+            },
+            "peerDependencies": {
+                "@types/node": "^20.19.0 || >=22.12.0",
+                "jiti": ">=1.21.0",
+                "less": "^4.0.0",
+                "lightningcss": "^1.21.0",
+                "sass": "^1.70.0",
+                "sass-embedded": "^1.70.0",
+                "stylus": ">=0.54.8",
+                "sugarss": "^5.0.0",
+                "terser": "^5.16.0",
+                "tsx": "^4.8.1",
+                "yaml": "^2.4.2"
+            },
+            "peerDependenciesMeta": {
+                "@types/node": {
+                    "optional": true
+                },
+                "jiti": {
+                    "optional": true
+                },
+                "less": {
+                    "optional": true
+                },
+                "lightningcss": {
+                    "optional": true
+                },
+                "sass": {
+                    "optional": true
+                },
+                "sass-embedded": {
+                    "optional": true
+                },
+                "stylus": {
+                    "optional": true
+                },
+                "sugarss": {
+                    "optional": true
+                },
+                "terser": {
+                    "optional": true
+                },
+                "tsx": {
+                    "optional": true
+                },
+                "yaml": {
+                    "optional": true
+                }
+            }
+        },
+        "node_modules/vite/node_modules/fdir": {
+            "version": "6.5.0",
+            "resolved": "https://registry.npmjs.org/fdir/-/fdir-6.5.0.tgz",
+            "integrity": "sha512-tIbYtZbucOs0BRGqPJkshJUYdL+SDH7dVM8gjy+ERp3WAUjLEFJE+02kanyHtwjWOnwrKYBiwAmM0p4kLJAnXg==",
+            "dev": true,
+            "license": "MIT",
+            "peer": true,
+            "engines": {
+                "node": ">=12.0.0"
+            },
+            "peerDependencies": {
+                "picomatch": "^3 || ^4"
+            },
+            "peerDependenciesMeta": {
+                "picomatch": {
+                    "optional": true
+                }
+            }
+        },
+        "node_modules/vite/node_modules/picomatch": {
+            "version": "4.0.3",
+            "resolved": "https://registry.npmjs.org/picomatch/-/picomatch-4.0.3.tgz",
+            "integrity": "sha512-5gTmgEY/sqK6gFXLIsQNH19lWb4ebPDLA4SdLP7dsWkIXHWlG66oPuVvXSGFPppYZz8ZDZq0dYYrbHfBCVUb1Q==",
+            "dev": true,
+            "license": "MIT",
+            "peer": true,
+            "engines": {
+                "node": ">=12"
+            },
+            "funding": {
+                "url": "https://github.com/sponsors/jonschlinkert"
+            }
+        },
         "node_modules/vue": {
             "version": "3.5.24",
             "resolved": "https://registry.npmjs.org/vue/-/vue-3.5.24.tgz",
diff --git a/package.json b/package.json
index cb1bd2d..b52295b 100644
--- a/package.json
+++ b/package.json
@@ -3,12 +3,17 @@
         "@babel/core": "^7.17.0",
         "@babel/preset-env": "^7.16.0",
         "@symfony/webpack-encore": "^5.1.0",
+        "@tailwindcss/postcss": "^4.1.17",
+        "@tailwindcss/vite": "^4.1.17",
+        "autoprefixer": "^10.4.21",
         "core-js": "^3.38.0",
-        "postcss": "^8.4.0",
+        "postcss": "^8.5.6",
         "postcss-loader": "^7.0.0",
         "regenerator-runtime": "^0.13.9",
         "sass": "^1.70.0",
         "sass-loader": "^16.0.0",
+        "tailwindcss": "^4.1.17",
+        "tailwindcss-primeui": "^0.6.1",
         "vue": "^3.5.0",
         "vue-loader": "^17.4.0",
         "webpack": "^5.74.0",
@@ -17,7 +22,6 @@
     "dependencies": {
         "@primevue/themes": "^4.4.1",
         "pinia": "^2.2.0",
-        "primeflex": "^3.3.1",
         "primeicons": "^7.0.0",
         "primevue": "^4.3.0",
         "vue-router": "^4.5.0"
diff --git a/postcss.config.js b/postcss.config.js
new file mode 100644
index 0000000..668a5b9
--- /dev/null
+++ b/postcss.config.js
@@ -0,0 +1,6 @@
+module.exports = {
+  plugins: {
+    '@tailwindcss/postcss': {},
+    autoprefixer: {},
+  },
+}
diff --git a/src/DataFixtures/ContactFixtures.php b/src/DataFixtures/ContactFixtures.php
new file mode 100644
index 0000000..ad4bad4
--- /dev/null
+++ b/src/DataFixtures/ContactFixtures.php
@@ -0,0 +1,226 @@
+<?php
+
+namespace App\DataFixtures;
+
+use App\Entity\Contact;
+use App\Entity\ContactPerson;
+use Doctrine\Bundle\FixturesBundle\Fixture;
+use Doctrine\Persistence\ObjectManager;
+
+class ContactFixtures extends Fixture
+{
+    private array $germanCities = [
+        ['Berlin', '10115', 'Berlin'],
+        ['Hamburg', '20095', 'Hamburg'],
+        ['München', '80331', 'Bayern'],
+        ['Köln', '50667', 'Nordrhein-Westfalen'],
+        ['Frankfurt', '60311', 'Hessen'],
+        ['Stuttgart', '70173', 'Baden-Württemberg'],
+        ['Düsseldorf', '40210', 'Nordrhein-Westfalen'],
+        ['Dortmund', '44135', 'Nordrhein-Westfalen'],
+        ['Essen', '45127', 'Nordrhein-Westfalen'],
+        ['Leipzig', '04109', 'Sachsen'],
+        ['Bremen', '28195', 'Bremen'],
+        ['Dresden', '01067', 'Sachsen'],
+        ['Hannover', '30159', 'Niedersachsen'],
+        ['Nürnberg', '90402', 'Bayern'],
+        ['Duisburg', '47051', 'Nordrhein-Westfalen'],
+        ['Bochum', '44787', 'Nordrhein-Westfalen'],
+        ['Wuppertal', '42103', 'Nordrhein-Westfalen'],
+        ['Bielefeld', '33602', 'Nordrhein-Westfalen'],
+        ['Bonn', '53111', 'Nordrhein-Westfalen'],
+        ['Münster', '48143', 'Nordrhein-Westfalen'],
+        ['Karlsruhe', '76133', 'Baden-Württemberg'],
+        ['Mannheim', '68159', 'Baden-Württemberg'],
+        ['Augsburg', '86150', 'Bayern'],
+        ['Wiesbaden', '65183', 'Hessen'],
+        ['Gelsenkirchen', '45879', 'Nordrhein-Westfalen'],
+        ['Mönchengladbach', '41061', 'Nordrhein-Westfalen'],
+        ['Braunschweig', '38100', 'Niedersachsen'],
+        ['Chemnitz', '09111', 'Sachsen'],
+        ['Kiel', '24103', 'Schleswig-Holstein'],
+        ['Aachen', '52062', 'Nordrhein-Westfalen'],
+    ];
+
+    private array $companyTypes = [
+        'GmbH', 'AG', 'GmbH & Co. KG', 'UG', 'e.K.', 'OHG', 'KG'
+    ];
+
+    private array $industries = [
+        'IT-Dienstleistungen',
+        'Softwareentwicklung',
+        'Maschinenbau',
+        'Handel',
+        'Consulting',
+        'Marketing',
+        'Logistik',
+        'Produktion',
+        'Automotive',
+        'Elektrotechnik',
+        'Bauwesen',
+        'Immobilien',
+        'Finanzdienstleistungen',
+        'Versicherungen',
+        'Gesundheitswesen',
+        'Gastronomie',
+        'Einzelhandel',
+        'Großhandel',
+        'Transport',
+        'Medien',
+    ];
+
+    private array $companyNames = [
+        'Innovate', 'TechCorp', 'Solutions', 'Systems', 'Digital', 'Smart',
+        'Global', 'Profi', 'Expert', 'Premium', 'Best', 'Top', 'Master',
+        'Alpha', 'Beta', 'Omega', 'Prime', 'Elite', 'Select', 'First',
+        'Advanced', 'Future', 'Next', 'Modern', 'Dynamic', 'Rapid', 'Swift',
+        'Quality', 'Perfect', 'Optimal', 'Excellent', 'Superior', 'Mega',
+    ];
+
+    private array $firstNames = [
+        'Thomas', 'Michael', 'Andreas', 'Peter', 'Wolfgang', 'Klaus', 'Jürgen',
+        'Anna', 'Maria', 'Sandra', 'Julia', 'Petra', 'Sabine', 'Claudia',
+        'Christian', 'Stefan', 'Markus', 'Daniel', 'Martin', 'Frank',
+        'Nicole', 'Katrin', 'Susanne', 'Martina', 'Stefanie', 'Andrea',
+        'Matthias', 'Alexander', 'Sebastian', 'Tobias', 'Jan', 'Patrick',
+    ];
+
+    private array $lastNames = [
+        'Müller', 'Schmidt', 'Schneider', 'Fischer', 'Weber', 'Meyer',
+        'Wagner', 'Becker', 'Schulz', 'Hoffmann', 'Schäfer', 'Koch',
+        'Bauer', 'Richter', 'Klein', 'Wolf', 'Schröder', 'Neumann',
+        'Schwarz', 'Zimmermann', 'Braun', 'Krüger', 'Hofmann', 'Hartmann',
+        'Lange', 'Schmitt', 'Werner', 'Schmitz', 'Krause', 'Meier',
+    ];
+
+    private array $streets = [
+        'Hauptstraße', 'Bahnhofstraße', 'Gartenstraße', 'Bergstraße', 'Dorfstraße',
+        'Schulstraße', 'Kirchstraße', 'Waldstraße', 'Marktplatz', 'Ringstraße',
+        'Parkstraße', 'Lindenstraße', 'Rosenweg', 'Am Markt', 'Mühlenweg',
+    ];
+
+    private array $positions = [
+        'Geschäftsführer', 'Geschäftsführerin', 'Vertriebsleiter', 'Vertriebsleiterin',
+        'Einkaufsleiter', 'Einkaufsleiterin', 'Prokurist', 'Prokuristin',
+        'Head of Sales', 'Verkaufsleiter', 'Verkaufsleiterin', 'Projektleiter',
+        'Projektleiterin', 'Abteilungsleiter', 'Abteilungsleiterin',
+    ];
+
+    private array $departments = [
+        'Vertrieb', 'Einkauf', 'Marketing', 'IT', 'Personal', 'Buchhaltung',
+        'Controlling', 'Produktion', 'Qualitätssicherung', 'Logistik',
+    ];
+
+    public function load(ObjectManager $manager): void
+    {
+        for ($i = 1; $i <= 200; $i++) {
+            $contact = new Contact();
+            
+            // Firmenname
+            $companyName = $this->companyNames[array_rand($this->companyNames)] . ' ' . 
+                          $this->industries[array_rand($this->industries)];
+            $companyType = $this->companyTypes[array_rand($this->companyTypes)];
+            $contact->setCompanyName($companyName . ' ' . $companyType);
+            
+            // Kundennummer
+            $contact->setCompanyNumber('K' . str_pad($i, 5, '0', STR_PAD_LEFT));
+            
+            // Adresse
+            $city = $this->germanCities[array_rand($this->germanCities)];
+            $street = $this->streets[array_rand($this->streets)];
+            $contact->setStreet($street . ' ' . rand(1, 150));
+            $contact->setZipCode($city[1]);
+            $contact->setCity($city[0]);
+            $contact->setCountry('Deutschland');
+            
+            // Kontaktdaten
+            $contact->setPhone('0' . rand(100, 999) . ' ' . rand(10000, 99999));
+            if (rand(0, 3) > 0) {
+                $contact->setFax('0' . rand(100, 999) . ' ' . rand(10000, 99999));
+            }
+            
+            $domain = strtolower(str_replace(' ', '', $companyName));
+            $domain = preg_replace('/[^a-z0-9]/', '', $domain);
+            $contact->setEmail('info@' . substr($domain, 0, 20) . '.de');
+            $contact->setWebsite('https://www.' . substr($domain, 0, 20) . '.de');
+            
+            // Steuernummern
+            if (rand(0, 1)) {
+                $contact->setTaxNumber(rand(10, 99) . '/' . rand(100, 999) . '/' . rand(10000, 99999));
+            }
+            if (rand(0, 1)) {
+                $contact->setVatNumber('DE' . rand(100000000, 999999999));
+            }
+            
+            // Typ
+            $type = rand(1, 10);
+            if ($type <= 6) {
+                $contact->setIsDebtor(true);
+            } elseif ($type <= 8) {
+                $contact->setIsCreditor(true);
+            } else {
+                $contact->setIsDebtor(true);
+                $contact->setIsCreditor(true);
+            }
+            
+            // Status
+            $contact->setIsActive(rand(0, 10) > 0); // 90% aktiv
+            
+            // Notizen
+            if (rand(0, 3) === 0) {
+                $notes = [
+                    'Wichtiger Kunde, bevorzugte Behandlung',
+                    'Zahlt pünktlich',
+                    'Benötigt ausführliche Beratung',
+                    'Großkunde mit Sonderkonditionen',
+                    'Neukunde seit ' . date('Y'),
+                    'Jahresvertrag läuft noch bis ' . date('m.Y', strtotime('+' . rand(1, 12) . ' months')),
+                ];
+                $contact->setNotes($notes[array_rand($notes)]);
+            }
+            
+            // Ansprechpartner (1-2 pro Firma)
+            $numPersons = rand(1, 2);
+            for ($p = 0; $p < $numPersons; $p++) {
+                $person = new ContactPerson();
+                
+                $gender = rand(0, 1);
+                $person->setSalutation($gender ? 'Herr' : 'Frau');
+                
+                if (rand(0, 5) === 0) {
+                    $person->setTitle(rand(0, 1) ? 'Dr.' : 'Prof. Dr.');
+                }
+                
+                $person->setFirstName($this->firstNames[array_rand($this->firstNames)]);
+                $person->setLastName($this->lastNames[array_rand($this->lastNames)]);
+                
+                $person->setPosition($this->positions[array_rand($this->positions)]);
+                $person->setDepartment($this->departments[array_rand($this->departments)]);
+                
+                $person->setPhone('0' . rand(100, 999) . ' ' . rand(10000, 99999) . '-' . rand(10, 99));
+                if (rand(0, 2) > 0) {
+                    $person->setMobile('0' . rand(150, 179) . ' ' . rand(1000000, 9999999));
+                }
+                
+                $firstName = strtolower($person->getFirstName());
+                $lastName = strtolower($person->getLastName());
+                $person->setEmail($firstName . '.' . $lastName . '@' . substr($domain, 0, 20) . '.de');
+                
+                $person->setIsPrimary($p === 0);
+                
+                $contact->addContactPerson($person);
+                $manager->persist($person);
+            }
+            
+            $manager->persist($contact);
+            
+            // Batch-Verarbeitung für bessere Performance
+            if (($i % 50) === 0) {
+                $manager->flush();
+                $manager->clear();
+            }
+        }
+        
+        $manager->flush();
+    }
+}
diff --git a/src/Entity/Contact.php b/src/Entity/Contact.php
new file mode 100644
index 0000000..61b44fd
--- /dev/null
+++ b/src/Entity/Contact.php
@@ -0,0 +1,394 @@
+<?php
+
+namespace App\Entity;
+
+use ApiPlatform\Metadata\ApiResource;
+use ApiPlatform\Metadata\ApiFilter;
+use ApiPlatform\Doctrine\Orm\Filter\BooleanFilter;
+use ApiPlatform\Doctrine\Orm\Filter\SearchFilter;
+use ApiPlatform\Metadata\Get;
+use ApiPlatform\Metadata\GetCollection;
+use ApiPlatform\Metadata\Post;
+use ApiPlatform\Metadata\Put;
+use ApiPlatform\Metadata\Delete;
+use App\Repository\ContactRepository;
+use Doctrine\Common\Collections\ArrayCollection;
+use Doctrine\Common\Collections\Collection;
+use Doctrine\DBAL\Types\Types;
+use Doctrine\ORM\Mapping as ORM;
+use Symfony\Component\Serializer\Annotation\Groups;
+use Symfony\Component\Validator\Constraints as Assert;
+
+#[ORM\Entity(repositoryClass: ContactRepository::class)]
+#[ORM\Table(name: 'contacts')]
+#[ApiResource(
+    operations: [
+        new GetCollection(stateless: false),
+        new Get(stateless: false),
+        new Post(security: "is_granted('ROLE_USER')", stateless: false),
+        new Put(security: "is_granted('ROLE_USER')", stateless: false),
+        new Delete(security: "is_granted('ROLE_ADMIN')", stateless: false)
+    ],
+    normalizationContext: ['groups' => ['contact:read']],
+    denormalizationContext: ['groups' => ['contact:write']],
+    order: ['companyName' => 'ASC']
+)]
+#[ApiFilter(BooleanFilter::class, properties: ['isDebtor', 'isCreditor', 'isActive'])]
+#[ApiFilter(SearchFilter::class, properties: ['companyName' => 'partial', 'city' => 'partial', 'email' => 'partial'])]
+class Contact
+{
+    #[ORM\Id]
+    #[ORM\GeneratedValue]
+    #[ORM\Column]
+    #[Groups(['contact:read'])]
+    private ?int $id = null;
+
+    #[ORM\Column(length: 255)]
+    #[Groups(['contact:read', 'contact:write'])]
+    #[Assert\NotBlank(message: 'Der Firmenname darf nicht leer sein')]
+    #[Assert\Length(max: 255)]
+    private ?string $companyName = null;
+
+    #[ORM\Column(length: 50, nullable: true)]
+    #[Groups(['contact:read', 'contact:write'])]
+    #[Assert\Length(max: 50)]
+    private ?string $companyNumber = null;
+
+    #[ORM\Column(type: Types::TEXT, nullable: true)]
+    #[Groups(['contact:read', 'contact:write'])]
+    private ?string $street = null;
+
+    #[ORM\Column(length: 20, nullable: true)]
+    #[Groups(['contact:read', 'contact:write'])]
+    #[Assert\Length(max: 20)]
+    private ?string $zipCode = null;
+
+    #[ORM\Column(length: 100, nullable: true)]
+    #[Groups(['contact:read', 'contact:write'])]
+    #[Assert\Length(max: 100)]
+    private ?string $city = null;
+
+    #[ORM\Column(length: 100, nullable: true)]
+    #[Groups(['contact:read', 'contact:write'])]
+    #[Assert\Length(max: 100)]
+    private ?string $country = null;
+
+    #[ORM\Column(length: 50, nullable: true)]
+    #[Groups(['contact:read', 'contact:write'])]
+    #[Assert\Length(max: 50)]
+    private ?string $phone = null;
+
+    #[ORM\Column(length: 50, nullable: true)]
+    #[Groups(['contact:read', 'contact:write'])]
+    #[Assert\Length(max: 50)]
+    private ?string $fax = null;
+
+    #[ORM\Column(length: 180, nullable: true)]
+    #[Groups(['contact:read', 'contact:write'])]
+    #[Assert\Email(message: 'Bitte geben Sie eine gültige E-Mail-Adresse ein')]
+    #[Assert\Length(max: 180)]
+    private ?string $email = null;
+
+    #[ORM\Column(length: 255, nullable: true)]
+    #[Groups(['contact:read', 'contact:write'])]
+    #[Assert\Url(message: 'Bitte geben Sie eine gültige URL ein')]
+    #[Assert\Length(max: 255)]
+    private ?string $website = null;
+
+    #[ORM\Column(length: 50, nullable: true)]
+    #[Groups(['contact:read', 'contact:write'])]
+    #[Assert\Length(max: 50)]
+    private ?string $taxNumber = null;
+
+    #[ORM\Column(length: 50, nullable: true)]
+    #[Groups(['contact:read', 'contact:write'])]
+    #[Assert\Length(max: 50)]
+    private ?string $vatNumber = null;
+
+    #[ORM\Column]
+    #[Groups(['contact:read', 'contact:write'])]
+    private bool $isDebtor = false;
+
+    #[ORM\Column]
+    #[Groups(['contact:read', 'contact:write'])]
+    private bool $isCreditor = false;
+
+    #[ORM\Column]
+    #[Groups(['contact:read', 'contact:write'])]
+    private bool $isActive = true;
+
+    #[ORM\Column(type: Types::TEXT, nullable: true)]
+    #[Groups(['contact:read', 'contact:write'])]
+    private ?string $notes = null;
+
+    #[ORM\OneToMany(targetEntity: ContactPerson::class, mappedBy: 'contact', cascade: ['persist', 'remove'], orphanRemoval: true)]
+    #[Groups(['contact:read', 'contact:write'])]
+    private Collection $contactPersons;
+
+    #[ORM\Column]
+    #[Groups(['contact:read'])]
+    private ?\DateTimeImmutable $createdAt = null;
+
+    #[ORM\Column(nullable: true)]
+    #[Groups(['contact:read'])]
+    private ?\DateTimeImmutable $updatedAt = null;
+
+    public function __construct()
+    {
+        $this->contactPersons = new ArrayCollection();
+        $this->createdAt = new \DateTimeImmutable();
+    }
+
+    public function getId(): ?int
+    {
+        return $this->id;
+    }
+
+    public function getCompanyName(): ?string
+    {
+        return $this->companyName;
+    }
+
+    public function setCompanyName(string $companyName): static
+    {
+        $this->companyName = $companyName;
+        $this->updatedAt = new \DateTimeImmutable();
+        return $this;
+    }
+
+    public function getCompanyNumber(): ?string
+    {
+        return $this->companyNumber;
+    }
+
+    public function setCompanyNumber(?string $companyNumber): static
+    {
+        $this->companyNumber = $companyNumber;
+        $this->updatedAt = new \DateTimeImmutable();
+        return $this;
+    }
+
+    public function getStreet(): ?string
+    {
+        return $this->street;
+    }
+
+    public function setStreet(?string $street): static
+    {
+        $this->street = $street;
+        $this->updatedAt = new \DateTimeImmutable();
+        return $this;
+    }
+
+    public function getZipCode(): ?string
+    {
+        return $this->zipCode;
+    }
+
+    public function setZipCode(?string $zipCode): static
+    {
+        $this->zipCode = $zipCode;
+        $this->updatedAt = new \DateTimeImmutable();
+        return $this;
+    }
+
+    public function getCity(): ?string
+    {
+        return $this->city;
+    }
+
+    public function setCity(?string $city): static
+    {
+        $this->city = $city;
+        $this->updatedAt = new \DateTimeImmutable();
+        return $this;
+    }
+
+    public function getCountry(): ?string
+    {
+        return $this->country;
+    }
+
+    public function setCountry(?string $country): static
+    {
+        $this->country = $country;
+        $this->updatedAt = new \DateTimeImmutable();
+        return $this;
+    }
+
+    public function getPhone(): ?string
+    {
+        return $this->phone;
+    }
+
+    public function setPhone(?string $phone): static
+    {
+        $this->phone = $phone;
+        $this->updatedAt = new \DateTimeImmutable();
+        return $this;
+    }
+
+    public function getFax(): ?string
+    {
+        return $this->fax;
+    }
+
+    public function setFax(?string $fax): static
+    {
+        $this->fax = $fax;
+        $this->updatedAt = new \DateTimeImmutable();
+        return $this;
+    }
+
+    public function getEmail(): ?string
+    {
+        return $this->email;
+    }
+
+    public function setEmail(?string $email): static
+    {
+        $this->email = $email;
+        $this->updatedAt = new \DateTimeImmutable();
+        return $this;
+    }
+
+    public function getWebsite(): ?string
+    {
+        return $this->website;
+    }
+
+    public function setWebsite(?string $website): static
+    {
+        $this->website = $website;
+        $this->updatedAt = new \DateTimeImmutable();
+        return $this;
+    }
+
+    public function getTaxNumber(): ?string
+    {
+        return $this->taxNumber;
+    }
+
+    public function setTaxNumber(?string $taxNumber): static
+    {
+        $this->taxNumber = $taxNumber;
+        $this->updatedAt = new \DateTimeImmutable();
+        return $this;
+    }
+
+    public function getVatNumber(): ?string
+    {
+        return $this->vatNumber;
+    }
+
+    public function setVatNumber(?string $vatNumber): static
+    {
+        $this->vatNumber = $vatNumber;
+        $this->updatedAt = new \DateTimeImmutable();
+        return $this;
+    }
+
+    public function isDebtor(): bool
+    {
+        return $this->isDebtor;
+    }
+
+    public function setIsDebtor(bool $isDebtor): static
+    {
+        $this->isDebtor = $isDebtor;
+        $this->updatedAt = new \DateTimeImmutable();
+        return $this;
+    }
+
+    public function isCreditor(): bool
+    {
+        return $this->isCreditor;
+    }
+
+    public function setIsCreditor(bool $isCreditor): static
+    {
+        $this->isCreditor = $isCreditor;
+        $this->updatedAt = new \DateTimeImmutable();
+        return $this;
+    }
+
+    public function getIsActive(): bool
+    {
+        return $this->isActive;
+    }
+
+    public function setIsActive(bool $isActive): static
+    {
+        $this->isActive = $isActive;
+        $this->updatedAt = new \DateTimeImmutable();
+        return $this;
+    }
+
+    public function getNotes(): ?string
+    {
+        return $this->notes;
+    }
+
+    public function setNotes(?string $notes): static
+    {
+        $this->notes = $notes;
+        $this->updatedAt = new \DateTimeImmutable();
+        return $this;
+    }
+
+    /**
+     * @return Collection<int, ContactPerson>
+     */
+    public function getContactPersons(): Collection
+    {
+        return $this->contactPersons;
+    }
+
+    public function addContactPerson(ContactPerson $contactPerson): static
+    {
+        if (!$this->contactPersons->contains($contactPerson)) {
+            $this->contactPersons->add($contactPerson);
+            $contactPerson->setContact($this);
+        }
+        $this->updatedAt = new \DateTimeImmutable();
+        return $this;
+    }
+
+    public function removeContactPerson(ContactPerson $contactPerson): static
+    {
+        if ($this->contactPersons->removeElement($contactPerson)) {
+            if ($contactPerson->getContact() === $this) {
+                $contactPerson->setContact(null);
+            }
+        }
+        $this->updatedAt = new \DateTimeImmutable();
+        return $this;
+    }
+
+    public function getCreatedAt(): ?\DateTimeImmutable
+    {
+        return $this->createdAt;
+    }
+
+    public function setCreatedAt(\DateTimeImmutable $createdAt): static
+    {
+        $this->createdAt = $createdAt;
+        return $this;
+    }
+
+    public function getUpdatedAt(): ?\DateTimeImmutable
+    {
+        return $this->updatedAt;
+    }
+
+    public function setUpdatedAt(?\DateTimeImmutable $updatedAt): static
+    {
+        $this->updatedAt = $updatedAt;
+        return $this;
+    }
+
+    public function __toString(): string
+    {
+        return $this->companyName ?? '';
+    }
+}
diff --git a/src/Entity/ContactPerson.php b/src/Entity/ContactPerson.php
new file mode 100644
index 0000000..a00c224
--- /dev/null
+++ b/src/Entity/ContactPerson.php
@@ -0,0 +1,216 @@
+<?php
+
+namespace App\Entity;
+
+use ApiPlatform\Metadata\ApiResource;
+use Doctrine\ORM\Mapping as ORM;
+use Symfony\Component\Serializer\Annotation\Groups;
+use Symfony\Component\Validator\Constraints as Assert;
+
+#[ORM\Entity]
+#[ORM\Table(name: 'contact_persons')]
+#[ApiResource(
+    operations: [],
+    normalizationContext: ['groups' => ['contact:read']],
+    denormalizationContext: ['groups' => ['contact:write']]
+)]
+class ContactPerson
+{
+    #[ORM\Id]
+    #[ORM\GeneratedValue]
+    #[ORM\Column]
+    #[Groups(['contact:read'])]
+    private ?int $id = null;
+
+    #[ORM\ManyToOne(targetEntity: Contact::class, inversedBy: 'contactPersons')]
+    #[ORM\JoinColumn(nullable: false, onDelete: 'CASCADE')]
+    private ?Contact $contact = null;
+
+    #[ORM\Column(length: 20, nullable: true)]
+    #[Groups(['contact:read', 'contact:write'])]
+    #[Assert\Length(max: 20)]
+    private ?string $salutation = null;
+
+    #[ORM\Column(length: 100, nullable: true)]
+    #[Groups(['contact:read', 'contact:write'])]
+    #[Assert\Length(max: 100)]
+    private ?string $title = null;
+
+    #[ORM\Column(length: 100)]
+    #[Groups(['contact:read', 'contact:write'])]
+    #[Assert\NotBlank(message: 'Der Vorname darf nicht leer sein')]
+    #[Assert\Length(max: 100)]
+    private ?string $firstName = null;
+
+    #[ORM\Column(length: 100)]
+    #[Groups(['contact:read', 'contact:write'])]
+    #[Assert\NotBlank(message: 'Der Nachname darf nicht leer sein')]
+    #[Assert\Length(max: 100)]
+    private ?string $lastName = null;
+
+    #[ORM\Column(length: 100, nullable: true)]
+    #[Groups(['contact:read', 'contact:write'])]
+    #[Assert\Length(max: 100)]
+    private ?string $position = null;
+
+    #[ORM\Column(length: 100, nullable: true)]
+    #[Groups(['contact:read', 'contact:write'])]
+    #[Assert\Length(max: 100)]
+    private ?string $department = null;
+
+    #[ORM\Column(length: 50, nullable: true)]
+    #[Groups(['contact:read', 'contact:write'])]
+    #[Assert\Length(max: 50)]
+    private ?string $phone = null;
+
+    #[ORM\Column(length: 50, nullable: true)]
+    #[Groups(['contact:read', 'contact:write'])]
+    #[Assert\Length(max: 50)]
+    private ?string $mobile = null;
+
+    #[ORM\Column(length: 180, nullable: true)]
+    #[Groups(['contact:read', 'contact:write'])]
+    #[Assert\Email(message: 'Bitte geben Sie eine gültige E-Mail-Adresse ein')]
+    #[Assert\Length(max: 180)]
+    private ?string $email = null;
+
+    #[ORM\Column]
+    #[Groups(['contact:read', 'contact:write'])]
+    private bool $isPrimary = false;
+
+    public function getId(): ?int
+    {
+        return $this->id;
+    }
+
+    public function getContact(): ?Contact
+    {
+        return $this->contact;
+    }
+
+    public function setContact(?Contact $contact): static
+    {
+        $this->contact = $contact;
+        return $this;
+    }
+
+    public function getSalutation(): ?string
+    {
+        return $this->salutation;
+    }
+
+    public function setSalutation(?string $salutation): static
+    {
+        $this->salutation = $salutation;
+        return $this;
+    }
+
+    public function getTitle(): ?string
+    {
+        return $this->title;
+    }
+
+    public function setTitle(?string $title): static
+    {
+        $this->title = $title;
+        return $this;
+    }
+
+    public function getFirstName(): ?string
+    {
+        return $this->firstName;
+    }
+
+    public function setFirstName(string $firstName): static
+    {
+        $this->firstName = $firstName;
+        return $this;
+    }
+
+    public function getLastName(): ?string
+    {
+        return $this->lastName;
+    }
+
+    public function setLastName(string $lastName): static
+    {
+        $this->lastName = $lastName;
+        return $this;
+    }
+
+    public function getPosition(): ?string
+    {
+        return $this->position;
+    }
+
+    public function setPosition(?string $position): static
+    {
+        $this->position = $position;
+        return $this;
+    }
+
+    public function getDepartment(): ?string
+    {
+        return $this->department;
+    }
+
+    public function setDepartment(?string $department): static
+    {
+        $this->department = $department;
+        return $this;
+    }
+
+    public function getPhone(): ?string
+    {
+        return $this->phone;
+    }
+
+    public function setPhone(?string $phone): static
+    {
+        $this->phone = $phone;
+        return $this;
+    }
+
+    public function getMobile(): ?string
+    {
+        return $this->mobile;
+    }
+
+    public function setMobile(?string $mobile): static
+    {
+        $this->mobile = $mobile;
+        return $this;
+    }
+
+    public function getEmail(): ?string
+    {
+        return $this->email;
+    }
+
+    public function setEmail(?string $email): static
+    {
+        $this->email = $email;
+        return $this;
+    }
+
+    public function getIsPrimary(): bool
+    {
+        return $this->isPrimary;
+    }
+
+    public function setIsPrimary(bool $isPrimary): static
+    {
+        $this->isPrimary = $isPrimary;
+        return $this;
+    }
+
+    public function getFullName(): string
+    {
+        return trim(($this->title ? $this->title . ' ' : '') . $this->firstName . ' ' . $this->lastName);
+    }
+
+    public function __toString(): string
+    {
+        return $this->getFullName();
+    }
+}
diff --git a/src/Repository/ContactRepository.php b/src/Repository/ContactRepository.php
new file mode 100644
index 0000000..8b25d98
--- /dev/null
+++ b/src/Repository/ContactRepository.php
@@ -0,0 +1,60 @@
+<?php
+
+namespace App\Repository;
+
+use App\Entity\Contact;
+use Doctrine\Bundle\DoctrineBundle\Repository\ServiceEntityRepository;
+use Doctrine\Persistence\ManagerRegistry;
+
+/**
+ * @extends ServiceEntityRepository<Contact>
+ */
+class ContactRepository extends ServiceEntityRepository
+{
+    public function __construct(ManagerRegistry $registry)
+    {
+        parent::__construct($registry, Contact::class);
+    }
+
+    /**
+     * Find contacts by type (debtor, creditor, or both)
+     */
+    public function findByType(?bool $isDebtor = null, ?bool $isCreditor = null): array
+    {
+        $qb = $this->createQueryBuilder('c')
+            ->where('c.isActive = :active')
+            ->setParameter('active', true)
+            ->orderBy('c.companyName', 'ASC');
+
+        if ($isDebtor !== null) {
+            $qb->andWhere('c.isDebtor = :isDebtor')
+               ->setParameter('isDebtor', $isDebtor);
+        }
+
+        if ($isCreditor !== null) {
+            $qb->andWhere('c.isCreditor = :isCreditor')
+               ->setParameter('isCreditor', $isCreditor);
+        }
+
+        return $qb->getQuery()->getResult();
+    }
+
+    /**
+     * Search contacts by company name, contact person, or email
+     */
+    public function search(string $searchTerm): array
+    {
+        return $this->createQueryBuilder('c')
+            ->leftJoin('c.contactPersons', 'cp')
+            ->where('c.companyName LIKE :search')
+            ->orWhere('c.email LIKE :search')
+            ->orWhere('c.city LIKE :search')
+            ->orWhere('cp.firstName LIKE :search')
+            ->orWhere('cp.lastName LIKE :search')
+            ->orWhere('cp.email LIKE :search')
+            ->setParameter('search', '%' . $searchTerm . '%')
+            ->orderBy('c.companyName', 'ASC')
+            ->getQuery()
+            ->getResult();
+    }
+}
diff --git a/tailwind.config.js b/tailwind.config.js
new file mode 100644
index 0000000..c6265df
--- /dev/null
+++ b/tailwind.config.js
@@ -0,0 +1,14 @@
+/** @type {import('tailwindcss').Config} */
+module.exports = {
+  content: [
+    "./assets/**/*.{js,vue}",
+    "./templates/**/*.html.twig",
+  ],
+  darkMode: 'class',
+  theme: {
+    extend: {},
+  },
+  plugins: [
+    require('tailwindcss-primeui')
+  ],
+}