diff --git a/App.tsx b/App.tsx
index 28169f5..14d08cb 100644
--- a/App.tsx
+++ b/App.tsx
@@ -95,14 +95,19 @@ const App: React.FC = () => {
     localStorage.setItem(PERSONA_STORAGE_KEY, JSON.stringify(personas));
   }, [personas]);
 
-  const handleLogin = (email: string) => {
-    // If we have users loaded (from NC or Init), check them
-    const user = users.find(u => u.email.toLowerCase() === email.toLowerCase() && u.status === 'aktiv');
-    if (user) {
-      setCurrentUser(user);
-    } else {
-      alert("Zugang verweigert. Nur verifizierte Wohnpro-Bewohner können sich im Wohnpro Guide anmelden.");
-    }
+  const handleLogin = (email: string): Promise<void> => {
+    return new Promise((resolve, reject) => {
+      // Simulate network delay for better UX
+      setTimeout(() => {
+        const user = users.find(u => u.email.toLowerCase() === email.toLowerCase() && u.status === 'aktiv');
+        if (user) {
+          setCurrentUser(user);
+          resolve();
+        } else {
+          reject(new Error("Zugang verweigert. Falsche E-Mail oder Einladung steht noch aus."));
+        }
+      }, 1000);
+    });
   };
 
   const sendMessage = async (text: string) => {
diff --git a/components/LoginView.tsx b/components/LoginView.tsx
index a7c3c0b..aadb686 100644
--- a/components/LoginView.tsx
+++ b/components/LoginView.tsx
@@ -3,21 +3,29 @@ import React, { useState } from 'react';
 import { User } from '../types';
 
 interface LoginViewProps {
-  onLogin: (email: string) => void;
+  onLogin: (email: string) => Promise<void>;
   error?: string;
 }
 
 const LoginView: React.FC<LoginViewProps> = ({ onLogin, error: externalError }) => {
   const [email, setEmail] = useState('');
+  const [isLoading, setIsLoading] = useState(false);
   const [error, setError] = useState(externalError || '');
 
-  const handleSubmit = (e: React.FormEvent) => {
+  const handleSubmit = async (e: React.FormEvent) => {
     e.preventDefault();
     if (!email) {
       setError('Bitte gib deine Wohnpro E-Mail Adresse ein.');
       return;
     }
-    onLogin(email);
+    setIsLoading(true);
+    setError('');
+    try {
+      await onLogin(email);
+    } catch (err: any) {
+      setError(err.message);
+      setIsLoading(false);
+    }
   };
 
   return (
@@ -48,9 +56,14 @@ const LoginView: React.FC<LoginViewProps> = ({ onLogin, error: externalError })
 
           <button
             type="submit"
-            className="w-full bg-black text-white rounded-2xl py-4 font-semibold text-lg hover:bg-gray-900 active:scale-[0.98] transition-all shadow-lg shadow-black/5"
+            disabled={isLoading}
+            className="w-full bg-black text-white rounded-2xl py-4 font-semibold text-lg hover:bg-gray-900 active:scale-[0.98] transition-all shadow-lg shadow-black/5 flex items-center justify-center disabled:opacity-75"
           >
-            Guide öffnen
+            {isLoading ? (
+              <div className="w-6 h-6 border-2 border-white/30 border-t-white rounded-full animate-spin" />
+            ) : (
+              'Guide öffnen'
+            )}
           </button>
         </form>