diff --git a/app/__pycache__/__init__.cpython-313.pyc b/app/__pycache__/__init__.cpython-313.pyc
index 48c7f93..d526b5b 100644
Binary files a/app/__pycache__/__init__.cpython-313.pyc and b/app/__pycache__/__init__.cpython-313.pyc differ
diff --git a/app/__pycache__/models.cpython-313.pyc b/app/__pycache__/models.cpython-313.pyc
index 7250129..6dffc92 100644
Binary files a/app/__pycache__/models.cpython-313.pyc and b/app/__pycache__/models.cpython-313.pyc differ
diff --git a/app/routes/__pycache__/api.cpython-313.pyc b/app/routes/__pycache__/api.cpython-313.pyc
index 65d941e..1ac417a 100644
Binary files a/app/routes/__pycache__/api.cpython-313.pyc and b/app/routes/__pycache__/api.cpython-313.pyc differ
diff --git a/app/routes/__pycache__/auth.cpython-313.pyc b/app/routes/__pycache__/auth.cpython-313.pyc
index b22ffdd..e36eade 100644
Binary files a/app/routes/__pycache__/auth.cpython-313.pyc and b/app/routes/__pycache__/auth.cpython-313.pyc differ
diff --git a/app/routes/auth.py b/app/routes/auth.py
index 1777eb8..d78f24d 100644
--- a/app/routes/auth.py
+++ b/app/routes/auth.py
@@ -24,30 +24,9 @@ def login():
 
 @auth_bp.route('/register', methods=['GET', 'POST'])
 def register():
-    if request.method == 'POST':
-        username = request.form['username']
-        email = request.form['email']
-        password = request.form['password']
-        
-        # Prüfe ob Benutzer bereits existiert
-        if User.query.filter_by(username=username).first():
-            flash('Benutzername bereits vergeben')
-            return render_template('auth/register.html')
-        
-        if User.query.filter_by(email=email).first():
-            flash('E-Mail bereits vergeben')
-            return render_template('auth/register.html')
-        
-        # Erstelle neuen Benutzer
-        user = User(username=username, email=email)
-        user.set_password(password)
-        db.session.add(user)
-        db.session.commit()
-        
-        flash('Registrierung erfolgreich')
-        return redirect(url_for('auth.login'))
-    
-    return render_template('auth/register.html')
+    # Registrierung deaktiviert - nur Administratoren können Benutzer erstellen
+    flash('Registrierung ist deaktiviert. Wenden Sie sich an einen Administrator.', 'error')
+    return redirect(url_for('auth.login'))
 
 @auth_bp.route('/logout')
 @login_required
diff --git a/app/templates/admin/create_user.html b/app/templates/admin/create_user.html
index 96a5c45..28d8848 100644
--- a/app/templates/admin/create_user.html
+++ b/app/templates/admin/create_user.html
@@ -7,8 +7,8 @@
     <div class="row justify-content-center">
         <div class="col-md-6">
             <div class="d-flex justify-content-between align-items-center mb-4">
-                <h2><i class="fas fa-user-plus"></i> Neuen Benutzer erstellen</h2>
-                <a href="{{ url_for('admin.users') }}" class="btn btn-outline-secondary">
+                <h4><i class="fas fa-user-plus"></i> Neuen Benutzer erstellen</h4>
+                <a href="{{ url_for('admin.users') }}" class="btn btn-outline-secondary btn-sm">
                     <i class="fas fa-arrow-left"></i> Zurück
                 </a>
             </div>
@@ -56,10 +56,10 @@
                         </div>
 
                         <div class="d-grid gap-2">
-                            <button type="submit" class="btn btn-success">
+                            <button type="submit" class="btn btn-success btn-sm">
                                 <i class="fas fa-user-plus"></i> Benutzer erstellen
                             </button>
-                            <a href="{{ url_for('admin.users') }}" class="btn btn-outline-secondary">
+                            <a href="{{ url_for('admin.users') }}" class="btn btn-outline-secondary btn-sm">
                                 <i class="fas fa-times"></i> Abbrechen
                             </a>
                         </div>
@@ -68,17 +68,16 @@
             </div>
 
             <!-- Hinweise -->
-            <div class="card mt-4">
+            <div class="card mt-3">
                 <div class="card-header">
-                    <h6><i class="fas fa-info-circle"></i> Wichtige Hinweise</h6>
+                    <h6><i class="fas fa-info-circle"></i> Hinweise</h6>
                 </div>
                 <div class="card-body">
-                    <ul class="mb-0">
+                    <ul class="mb-0 small">
                         <li>Alle mit * markierten Felder sind Pflichtfelder</li>
-                        <li>Der Benutzername und die E-Mail-Adresse müssen eindeutig sein</li>
-                        <li>Das Passwort sollte sicher gewählt werden</li>
-                        <li>Administrator-Rechte gewähren Vollzugriff auf alle Funktionen</li>
-                        <li>Neue Benutzer können sich sofort mit ihren Anmeldedaten einloggen</li>
+                        <li>Benutzername und E-Mail müssen eindeutig sein</li>
+                        <li>Passwort sollte sicher gewählt werden (mind. 6 Zeichen)</li>
+                        <li>Admin-Rechte gewähren Vollzugriff auf alle Funktionen</li>
                     </ul>
                 </div>
             </div>
diff --git a/app/templates/admin/dashboard.html b/app/templates/admin/dashboard.html
index c633caa..5c620c7 100644
--- a/app/templates/admin/dashboard.html
+++ b/app/templates/admin/dashboard.html
@@ -7,9 +7,9 @@
     <div class="row">
         <div class="col-12">
             <div class="d-flex justify-content-between align-items-center mb-4">
-                <h2><i class="fas fa-users-cog"></i> Admin Dashboard</h2>
-                <a href="{{ url_for('main.dashboard') }}" class="btn btn-outline-secondary">
-                    <i class="fas fa-arrow-left"></i> Zurück zum Dashboard
+                <h4><i class="fas fa-users-cog"></i> Admin Dashboard</h4>
+                <a href="{{ url_for('main.dashboard') }}" class="btn btn-outline-secondary btn-sm">
+                    <i class="fas fa-arrow-left"></i> Zurück
                 </a>
             </div>
 
@@ -74,26 +74,18 @@
                 <div class="col-12">
                     <div class="card">
                         <div class="card-header">
-                            <h5><i class="fas fa-tachometer-alt"></i> Schnellzugriff</h5>
+                            <h6><i class="fas fa-tachometer-alt"></i> Schnellzugriff</h6>
                         </div>
                         <div class="card-body">
                             <div class="row">
-                                <div class="col-md-6 mb-3">
-                                    <a href="{{ url_for('admin.users') }}" class="btn btn-outline-primary btn-lg w-100">
-                                        <i class="fas fa-users"></i>
-                                        <div class="mt-2">
-                                            <strong>Benutzerverwaltung</strong>
-                                            <br><small class="text-muted">Benutzer anzeigen, bearbeiten und erstellen</small>
-                                        </div>
+                                <div class="col-md-6 mb-2">
+                                    <a href="{{ url_for('admin.users') }}" class="btn btn-outline-primary btn-sm w-100">
+                                        <i class="fas fa-users me-1"></i> Benutzerverwaltung
                                     </a>
                                 </div>
-                                <div class="col-md-6 mb-3">
-                                    <a href="{{ url_for('admin.create_user') }}" class="btn btn-outline-success btn-lg w-100">
-                                        <i class="fas fa-user-plus"></i>
-                                        <div class="mt-2">
-                                            <strong>Neuen Benutzer erstellen</strong>
-                                            <br><small class="text-muted">Schnell einen neuen Benutzer hinzufügen</small>
-                                        </div>
+                                <div class="col-md-6 mb-2">
+                                    <a href="{{ url_for('admin.create_user') }}" class="btn btn-outline-success btn-sm w-100">
+                                        <i class="fas fa-user-plus me-1"></i> Neuen Benutzer erstellen
                                     </a>
                                 </div>
                             </div>
@@ -107,7 +99,7 @@
                 <div class="col-12">
                     <div class="card">
                         <div class="card-header">
-                            <h5><i class="fas fa-clock"></i> Letzte Benutzer</h5>
+                            <h6><i class="fas fa-clock"></i> Letzte Benutzer</h6>
                         </div>
                         <div class="card-body">
                             {% if users %}
@@ -152,15 +144,15 @@
                                 </table>
                             </div>
                             <div class="text-center mt-3">
-                                <a href="{{ url_for('admin.users') }}" class="btn btn-primary">
-                                    Alle Benutzer anzeigen <i class="fas fa-arrow-right"></i>
+                                <a href="{{ url_for('admin.users') }}" class="btn btn-primary btn-sm">
+                                    Alle Benutzer <i class="fas fa-arrow-right"></i>
                                 </a>
                             </div>
                             {% else %}
-                            <div class="text-center text-muted py-4">
-                                <i class="fas fa-users fa-3x mb-3"></i>
-                                <h5>Keine Benutzer gefunden</h5>
-                                <p>Erstellen Sie den ersten Benutzer über den Button oben.</p>
+                            <div class="text-center text-muted py-3">
+                                <i class="fas fa-users fa-2x mb-2"></i>
+                                <h6>Keine Benutzer gefunden</h6>
+                                <p class="small">Erstellen Sie den ersten Benutzer über den Button oben.</p>
                             </div>
                             {% endif %}
                         </div>
diff --git a/app/templates/admin/edit_user.html b/app/templates/admin/edit_user.html
index 644d186..5b81ff7 100644
--- a/app/templates/admin/edit_user.html
+++ b/app/templates/admin/edit_user.html
@@ -7,23 +7,23 @@
     <div class="row justify-content-center">
         <div class="col-md-6">
             <div class="d-flex justify-content-between align-items-center mb-4">
-                <h2><i class="fas fa-user-edit"></i> Benutzer bearbeiten</h2>
-                <a href="{{ url_for('admin.users') }}" class="btn btn-outline-secondary">
+                <h4><i class="fas fa-user-edit"></i> Benutzer bearbeiten</h4>
+                <a href="{{ url_for('admin.users') }}" class="btn btn-outline-secondary btn-sm">
                     <i class="fas fa-arrow-left"></i> Zurück
                 </a>
             </div>
 
             <div class="card">
                 <div class="card-header">
-                    <h5>
+                    <h6>
                         {{ user.username }}
                         {% if user.id == current_user.id %}
                         <span class="badge bg-primary">Sie</span>
                         {% endif %}
                         {% if user.is_admin %}
-                        <span class="badge bg-danger">Administrator</span>
+                        <span class="badge bg-danger">Admin</span>
                         {% endif %}
-                    </h5>
+                    </h6>
                 </div>
                 <div class="card-body">
                     <form method="POST">
@@ -77,10 +77,10 @@
                         </div>
 
                         <div class="d-grid gap-2">
-                            <button type="submit" class="btn btn-primary">
+                            <button type="submit" class="btn btn-primary btn-sm">
                                 <i class="fas fa-save"></i> Änderungen speichern
                             </button>
-                            <a href="{{ url_for('admin.users') }}" class="btn btn-outline-secondary">
+                            <a href="{{ url_for('admin.users') }}" class="btn btn-outline-secondary btn-sm">
                                 <i class="fas fa-times"></i> Abbrechen
                             </a>
                         </div>
@@ -89,20 +89,20 @@
             </div>
 
             <!-- Benutzer-Informationen -->
-            <div class="card mt-4">
+            <div class="card mt-3">
                 <div class="card-header">
-                    <h6><i class="fas fa-info-circle"></i> Benutzer-Informationen</h6>
+                    <h6><i class="fas fa-info-circle"></i> Benutzer-Info</h6>
                 </div>
                 <div class="card-body">
-                    <div class="row">
-                        <div class="col-sm-4"><strong>Benutzer-ID:</strong></div>
+                    <div class="row small">
+                        <div class="col-sm-4"><strong>ID:</strong></div>
                         <div class="col-sm-8">{{ user.id }}</div>
                     </div>
-                    <div class="row">
-                        <div class="col-sm-4"><strong>Erstellt am:</strong></div>
-                        <div class="col-sm-8">{{ user.created_at.strftime('%d.%m.%Y %H:%M:%S') }}</div>
+                    <div class="row small">
+                        <div class="col-sm-4"><strong>Erstellt:</strong></div>
+                        <div class="col-sm-8">{{ user.created_at.strftime('%d.%m.%Y %H:%M') }}</div>
                     </div>
-                    <div class="row">
+                    <div class="row small">
                         <div class="col-sm-4"><strong>Rolle:</strong></div>
                         <div class="col-sm-8">
                             {% if user.is_admin %}
@@ -112,8 +112,8 @@
                             {% endif %}
                         </div>
                     </div>
-                    <div class="row">
-                        <div class="col-sm-4"><strong>Anzahl Queries:</strong></div>
+                    <div class="row small">
+                        <div class="col-sm-4"><strong>Queries:</strong></div>
                         <div class="col-sm-8">{{ user.saved_queries|length }}</div>
                     </div>
                 </div>
@@ -121,18 +121,18 @@
 
             <!-- Lösch-Option -->
             {% if user.id != current_user.id %}
-            <div class="card mt-4 border-danger">
+            <div class="card mt-3 border-danger">
                 <div class="card-header bg-danger text-white">
                     <h6><i class="fas fa-exclamation-triangle"></i> Gefahrenbereich</h6>
                 </div>
                 <div class="card-body">
-                    <p class="text-danger">
-                        <strong>Achtung:</strong> Das Löschen eines Benutzers kann nicht rückgängig gemacht werden. 
-                        Alle gespeicherten Queries dieses Benutzers gehen verloren.
+                    <p class="text-danger small mb-2">
+                        <strong>Achtung:</strong> Das Löschen kann nicht rückgängig gemacht werden. 
+                        Alle Queries gehen verloren.
                     </p>
                     <form method="POST" action="{{ url_for('admin.delete_user', user_id=user.id) }}" 
-                          onsubmit="return confirm('Benutzer {{ user.username }} wirklich unwiderruflich löschen?\\n\\nAlle gespeicherten Queries gehen verloren!')">
-                        <button type="submit" class="btn btn-danger">
+                          onsubmit="return confirm('Benutzer {{ user.username }} wirklich löschen?\\n\\nAlle Queries gehen verloren!')">
+                        <button type="submit" class="btn btn-danger btn-sm">
                             <i class="fas fa-trash"></i> Benutzer löschen
                         </button>
                     </form>
diff --git a/app/templates/admin/users.html b/app/templates/admin/users.html
index fe34cc7..684bda8 100644
--- a/app/templates/admin/users.html
+++ b/app/templates/admin/users.html
@@ -7,13 +7,13 @@
     <div class="row">
         <div class="col-12">
             <div class="d-flex justify-content-between align-items-center mb-4">
-                <h2><i class="fas fa-users"></i> Benutzerverwaltung</h2>
+                <h4><i class="fas fa-users"></i> Benutzerverwaltung</h4>
                 <div>
-                    <a href="{{ url_for('admin.create_user') }}" class="btn btn-success">
-                        <i class="fas fa-user-plus"></i> Neuen Benutzer erstellen
+                    <a href="{{ url_for('admin.create_user') }}" class="btn btn-success btn-sm">
+                        <i class="fas fa-user-plus"></i> Erstellen
                     </a>
-                    <a href="{{ url_for('admin.admin_dashboard') }}" class="btn btn-outline-secondary">
-                        <i class="fas fa-arrow-left"></i> Admin Dashboard
+                    <a href="{{ url_for('admin.admin_dashboard') }}" class="btn btn-outline-secondary btn-sm">
+                        <i class="fas fa-arrow-left"></i> Zurück
                     </a>
                 </div>
             </div>
@@ -47,17 +47,17 @@
                                     <td>
                                         <div class="d-flex align-items-center">
                                             {% if user.is_admin %}
-                                            <span class="badge bg-danger me-2">
-                                                <i class="fas fa-user-shield"></i> Administrator
+                                            <span class="badge bg-danger me-1">
+                                                <i class="fas fa-user-shield"></i> Admin
                                             </span>
                                             {% else %}
-                                            <span class="badge bg-secondary me-2">
-                                                <i class="fas fa-user"></i> Benutzer
+                                            <span class="badge bg-secondary me-1">
+                                                <i class="fas fa-user"></i> User
                                             </span>
                                             {% endif %}
                                             
                                             {% if user.id != current_user.id %}
-                                            <button class="btn btn-xs btn-outline-info" 
+                                            <button class="btn btn-xs btn-outline-info btn-sm" 
                                                     onclick="toggleAdmin({{ user.id }})" 
                                                     title="Rolle wechseln">
                                                 <i class="fas fa-exchange-alt"></i>
@@ -69,14 +69,14 @@
                                     <td>
                                         <div class="btn-group btn-group-sm">
                                             <a href="{{ url_for('admin.edit_user', user_id=user.id) }}" 
-                                               class="btn btn-outline-primary" title="Bearbeiten">
+                                               class="btn btn-outline-primary btn-sm" title="Bearbeiten">
                                                 <i class="fas fa-edit"></i>
                                             </a>
                                             
                                             {% if user.id != current_user.id %}
                                             <form method="POST" action="{{ url_for('admin.delete_user', user_id=user.id) }}" 
                                                   class="d-inline" onsubmit="return confirm('Benutzer {{ user.username }} wirklich löschen?')">
-                                                <button type="submit" class="btn btn-outline-danger" title="Löschen">
+                                                <button type="submit" class="btn btn-outline-danger btn-sm" title="Löschen">
                                                     <i class="fas fa-trash"></i>
                                                 </button>
                                             </form>
@@ -92,11 +92,11 @@
             </div>
             {% else %}
             <div class="card">
-                <div class="card-body text-center py-5">
-                    <i class="fas fa-users fa-3x text-muted mb-3"></i>
-                    <h4>Keine Benutzer gefunden</h4>
-                    <p class="text-muted">Erstellen Sie den ersten Benutzer.</p>
-                    <a href="{{ url_for('admin.create_user') }}" class="btn btn-success">
+                <div class="card-body text-center py-4">
+                    <i class="fas fa-users fa-2x text-muted mb-2"></i>
+                    <h6>Keine Benutzer gefunden</h6>
+                    <p class="text-muted small">Erstellen Sie den ersten Benutzer.</p>
+                    <a href="{{ url_for('admin.create_user') }}" class="btn btn-success btn-sm">
                         <i class="fas fa-user-plus"></i> Ersten Benutzer erstellen
                     </a>
                 </div>
diff --git a/app/templates/auth/login.html b/app/templates/auth/login.html
index 0941167..57e5964 100644
--- a/app/templates/auth/login.html
+++ b/app/templates/auth/login.html
@@ -30,17 +30,13 @@
                     </div>
                 </form>
             </div>
-            <div class="card-footer text-center">
-                <a href="{{ url_for('auth.register') }}" class="text-decoration-none">
-                    Noch kein Konto? Hier registrieren
-                </a>
-            </div>
         </div>
         
-        <div class="mt-3 p-3 bg-light rounded">
-            <h6>Demo-Zugang:</h6>
-            <p class="small mb-1"><strong>Benutzername:</strong> admin</p>
-            <p class="small mb-0"><strong>Passwort:</strong> admin123</p>
+        <div class="mt-3 p-2 bg-info text-white rounded">
+            <p class="small mb-0">
+                <i class="fas fa-info-circle"></i> 
+                Neue Benutzer werden von Administratoren erstellt.
+            </p>
         </div>
     </div>
 </div>