Complete redesign: Implement proper chat interface

- Replace single response layout with real chat window
- Messages flow chronologically from top to bottom
- User messages on right (blue), AI responses on left (gray)
- Fixed input field always at bottom for continuous conversation
- Auto-scroll to latest messages
- Message timestamps and proper chat bubbles
- Clear chat functionality and example questions
- Keyboard shortcuts (Enter to send, Shift+Enter for new line)
- Real-time chat experience like modern messaging apps

src/app/page.tsx

@@ -23,9 +23,9 @@ export default function Home() {
           {/* Header */}
           <Header />
           
-          {/* Main Content - Clean Single Panel */}
-          <div className="flex justify-center items-center h-[calc(100vh-120px)] p-6">
-            <div className="w-full max-w-4xl">
+          {/* Main Content - Full Height Chat Interface */}
+          <div className="h-[calc(100vh-120px)] p-6">
+            <div className="w-full h-full max-w-4xl mx-auto">
               <MissionControl />
             </div>
           </div>

src/components/MissionControl.tsx

@@ -1,172 +1,238 @@
 'use client';
 
-import { useState } from 'react';
+import { useState, useRef, useEffect } from 'react';
 import { useLanguage } from './LanguageProvider';
 
+interface ChatMessage {
+  id: string;
+  type: 'user' | 'ai';
+  content: string;
+  timestamp: Date;
+}
+
 export default function MissionControl() {
   const { language } = useLanguage();
   const [question, setQuestion] = useState('');
   const [isThinking, setIsThinking] = useState(false);
-  const [response, setResponse] = useState<string | null>(null);
+  const [chatMessages, setChatMessages] = useState<ChatMessage[]>([]);
+  const messagesEndRef = useRef<HTMLDivElement>(null);
+  const textareaRef = useRef<HTMLTextAreaElement>(null);
   
-  const messages = {
+  const uiTexts = {
     en: {
-      title: "AI Learning Center",
-      subtitle: "Ask About Anything!",
-      placeholder: "What would you like to explore today?",
-      launch: "🚀 Start Learning",
-      thinking: "🤔 Thinking...",
+      title: "AI Learning Chat",
+      subtitle: "Ask me anything!",
+      placeholder: "Type your question here...",
+      send: "Send",
+      thinking: "AI is thinking...",
       examples: ["How do plants grow?", "What's gravity?", "Tell me about art!", "Why is the sky blue?"],
-      askAnother: "Ask Another Question"
+      clearChat: "Clear Chat",
+      you: "You",
+      ai: "AI Assistant"
     },
     de: {
-      title: "KI-Lernzentrale", 
-      subtitle: "Frag nach allem!",
-      placeholder: "Was möchtest du heute erforschen?",
-      launch: "🚀 Lernen starten",
-      thinking: "🤔 Denke nach...",
+      title: "KI-Lern-Chat", 
+      subtitle: "Frag mich alles!",
+      placeholder: "Stelle hier deine Frage...",
+      send: "Senden",
+      thinking: "KI denkt nach...",
       examples: ["Wie wachsen Pflanzen?", "Was ist Schwerkraft?", "Erzähl mir über Kunst!", "Warum ist der Himmel blau?"],
-      askAnother: "Neue Frage stellen"
+      clearChat: "Chat löschen",
+      you: "Du",
+      ai: "KI-Assistent"
     }
   };
 
-  // Simple function to ask AI
-  const askAI = async (questionText: string) => {
-    if (!questionText.trim()) return;
+  // Auto-scroll to bottom when new messages arrive
+  useEffect(() => {
+    messagesEndRef.current?.scrollIntoView({ behavior: 'smooth' });
+  }, [chatMessages, isThinking]);
+
+  // Focus textarea when component mounts
+  useEffect(() => {
+    textareaRef.current?.focus();
+  }, []);
+
+  const addMessage = (type: 'user' | 'ai', content: string) => {
+    const newMessage: ChatMessage = {
+      id: Date.now().toString(),
+      type,
+      content,
+      timestamp: new Date()
+    };
+    setChatMessages(prev => [...prev, newMessage]);
+  };
+
+  const askAI = async () => {
+    if (!question.trim() || isThinking) return;
     
+    const userQuestion = question.trim();
+    
+    // Add user message to chat
+    addMessage('user', userQuestion);
+    
+    // Clear input and show thinking
+    setQuestion('');
     setIsThinking(true);
     
     try {
       const res = await fetch('/api/chat', {
         method: 'POST',
         headers: { 'Content-Type': 'application/json' },
-        body: JSON.stringify({ question: questionText.trim(), language }),
+        body: JSON.stringify({ question: userQuestion, language }),
       });
       
       if (res.ok) {
         const aiResponse = await res.json();
-        setResponse(aiResponse.message || "Great question! Let me help you think about this...");
+        addMessage('ai', aiResponse.message || "Great question! Let me help you think about this...");
       } else {
-        setResponse(language === 'en' ? "Sorry, I had trouble with that. Try again!" : "Entschuldigung, da gab es ein Problem. Versuch es nochmal!");
+        addMessage('ai', language === 'en' ? "Sorry, I had trouble with that. Try again!" : "Entschuldigung, da gab es ein Problem. Versuch es nochmal!");
       }
     } catch (err) {
-      setResponse(language === 'en' ? "Oops! Something went wrong." : "Ups! Etwas ist schiefgelaufen.");
+      addMessage('ai', language === 'en' ? "Oops! Something went wrong." : "Ups! Etwas ist schiefgelaufen.");
     } finally {
       setIsThinking(false);
-      setQuestion(''); // Clear input after submitting
+      // Focus back to input
+      setTimeout(() => textareaRef.current?.focus(), 100);
     }
   };
 
-  // ALWAYS show both the input AND response (if exists)
+  const handleKeyPress = (e: React.KeyboardEvent) => {
+    if (e.key === 'Enter' && !e.shiftKey) {
+      e.preventDefault();
+      askAI();
+    }
+  };
+
+  const clearChat = () => {
+    setChatMessages([]);
+    setQuestion('');
+    textareaRef.current?.focus();
+  };
+
   return (
-    <div className="text-center space-y-6">
+    <div className="flex flex-col h-full max-w-4xl mx-auto">
       {/* Header */}
-      <div className="mb-8">
+      <div className="text-center py-6 border-b border-emerald-400/30">
         <h2 className="text-3xl font-bold text-amber-300 mb-2 animate-pulse-rainbow">
-          {(messages as any)[language].title}
+          {(uiTexts as any)[language].title}
         </h2>
-        <p className="text-emerald-200 text-lg">{(messages as any)[language].subtitle}</p>
+        <p className="text-emerald-200 text-lg">{(uiTexts as any)[language].subtitle}</p>
+        {chatMessages.length > 0 && (
+          <button
+            onClick={clearChat}
+            className="mt-3 px-4 py-2 bg-red-600 hover:bg-red-700 text-white rounded-lg text-sm transition-colors"
+          >
+            🗑️ {(uiTexts as any)[language].clearChat}
+          </button>
+        )}
       </div>
-      
-      {/* ALWAYS SHOW: Input area */}
-      <div className="space-y-6">
-        <div className="bg-black/40 rounded-2xl p-6 border-2 border-emerald-400 backdrop-blur-sm">
-          <h3 className="text-lg font-semibold text-emerald-300 mb-4">
-            {response ? 
-              (language === 'en' ? '🤔 Ask another question:' : '🤔 Stelle eine weitere Frage:') :
-              (language === 'en' ? '🌟 What would you like to know?' : '🌟 Was möchtest du wissen?')
-            }
-          </h3>
-          <textarea
-            value={question}
-            onChange={(e) => setQuestion(e.target.value)}
-            placeholder={(messages as any)[language].placeholder}
-            className="w-full h-32 bg-gray-900/80 text-emerald-100 rounded-xl p-4 border border-emerald-500 focus:border-emerald-300 focus:outline-none focus:ring-2 focus:ring-emerald-400/50 resize-none text-lg placeholder-emerald-600"
-            disabled={isThinking}
-          />
-        </div>
-        
-        <button
-          onClick={() => askAI(question)}
-          disabled={!question.trim() || isThinking}
-          style={{
-            backgroundColor: isThinking ? '#6B7280' : '#EA580C',
-            color: 'white',
-            padding: '16px 32px',
-            border: 'none',
-            borderRadius: '12px',
-            fontSize: '18px',
-            fontWeight: 'bold',
-            cursor: isThinking ? 'not-allowed' : 'pointer',
-            display: 'block',
-            margin: '0 auto',
-            boxShadow: '0 4px 6px rgba(0, 0, 0, 0.1)'
-          }}
-        >
-          {isThinking ? (messages as any)[language].thinking : (messages as any)[language].launch}
-        </button>
+
+      {/* Chat Messages Area */}
+      <div className="flex-1 overflow-y-auto p-4 space-y-4 min-h-0">
+        {chatMessages.length === 0 && (
+          <div className="text-center py-8">
+            <p className="text-emerald-300 text-lg mb-6">
+              {language === 'en' ? 'Start a conversation!' : 'Beginne ein Gespräch!'}
+            </p>
+            
+            {/* Example questions */}
+            <div className="bg-black/20 rounded-xl p-4 border border-amber-400">
+              <h3 className="text-amber-300 font-semibold mb-3">
+                {language === 'en' ? 'Try asking:' : 'Frag zum Beispiel:'}
+              </h3>
+              <div className="flex flex-wrap gap-3 justify-center">
+                {(uiTexts as any)[language].examples.map((example: string, index: number) => (
+                  <button
+                    key={index}
+                    onClick={() => setQuestion(example)}
+                    className="px-4 py-2 bg-orange-600 hover:bg-orange-700 text-white rounded-lg text-sm transition-colors"
+                    disabled={isThinking}
+                  >
+                    {example}
+                  </button>
+                ))}
+              </div>
+            </div>
+          </div>
+        )}
+
+        {/* Chat Messages */}
+        {chatMessages.map((message) => (
+          <div
+            key={message.id}
+            className={`flex ${message.type === 'user' ? 'justify-end' : 'justify-start'}`}
+          >
+            <div
+              className={`max-w-[80%] rounded-xl p-4 ${
+                message.type === 'user'
+                  ? 'bg-blue-600 text-white ml-auto'
+                  : 'bg-gray-800 text-emerald-100 border border-emerald-500'
+              }`}
+            >
+              <div className="flex items-center gap-2 mb-2">
+                <span className="font-semibold text-sm">
+                  {message.type === 'user' ? (uiTexts as any)[language].you : (uiTexts as any)[language].ai}
+                </span>
+                <span className="text-xs opacity-70">
+                  {message.timestamp.toLocaleTimeString()}
+                </span>
+              </div>
+              <p className="whitespace-pre-line leading-relaxed">{message.content}</p>
+            </div>
+          </div>
+        ))}
+
+        {/* Thinking indicator */}
+        {isThinking && (
+          <div className="flex justify-start">
+            <div className="bg-gray-800 text-emerald-100 border border-emerald-500 rounded-xl p-4 max-w-[80%]">
+              <div className="flex items-center gap-2 mb-2">
+                <span className="font-semibold text-sm">{(uiTexts as any)[language].ai}</span>
+              </div>
+              <p className="flex items-center gap-2">
+                <span className="animate-pulse">🤔</span>
+                {(uiTexts as any)[language].thinking}
+                <span className="animate-bounce">...</span>
+              </p>
+            </div>
+          </div>
+        )}
+
+        {/* Scroll anchor */}
+        <div ref={messagesEndRef} />
       </div>
-      
-      {/* Show response IF it exists */}
-      {response && (
-        <div className="bg-black/40 rounded-2xl p-6 border-2 border-emerald-400 backdrop-blur-sm mt-6">
-          <h3 className="text-2xl font-bold text-amber-300 mb-4">💡 AI Response:</h3>
-          
-          <div className="bg-gray-900/80 rounded-xl p-4 border border-emerald-500 mb-4">
-            <p className="text-emerald-100 text-lg leading-relaxed whitespace-pre-line">
-              {response}
+
+      {/* Input Area - Always at bottom */}
+      <div className="border-t border-emerald-400/30 p-4 bg-black/40 backdrop-blur-sm">
+        <div className="flex gap-3 items-end">
+          <div className="flex-1">
+            <textarea
+              ref={textareaRef}
+              value={question}
+              onChange={(e) => setQuestion(e.target.value)}
+              onKeyPress={handleKeyPress}
+              placeholder={(uiTexts as any)[language].placeholder}
+              className="w-full bg-gray-900/80 text-emerald-100 rounded-xl p-4 border border-emerald-500 focus:border-emerald-300 focus:outline-none focus:ring-2 focus:ring-emerald-400/50 resize-none text-lg placeholder-emerald-600"
+              rows={2}
+              disabled={isThinking}
+            />
+            <p className="text-xs text-emerald-400 mt-1">
+              {language === 'en' ? 'Press Enter to send, Shift+Enter for new line' : 'Enter zum Senden, Shift+Enter für neue Zeile'}
             </p>
           </div>
-          
-          <p className="text-emerald-300 text-sm mb-4">
-            {language === 'en' ? '↑ Ask another question above!' : '↑ Stelle eine weitere Frage oben!'}
-          </p>
-          
           <button
-            onClick={() => {
-              setResponse(null);
-              setQuestion('');
-            }}
-            style={{
-              backgroundColor: '#8B5CF6',
-              color: 'white',
-              padding: '12px 24px',
-              border: 'none',
-              borderRadius: '10px',
-              fontSize: '16px',
-              cursor: 'pointer',
-              boxShadow: '0 4px 6px rgba(0, 0, 0, 0.1)'
-            }}
+            onClick={askAI}
+            disabled={!question.trim() || isThinking}
+            className={`px-6 py-4 rounded-xl font-bold text-lg transition-all ${
+              !question.trim() || isThinking
+                ? 'bg-gray-600 text-gray-400 cursor-not-allowed'
+                : 'bg-emerald-600 hover:bg-emerald-700 text-white shadow-lg hover:shadow-xl'
+            }`}
           >
-            {language === 'en' ? '🗑️ Clear Response' : '🗑️ Antwort löschen'}
+            {isThinking ? '⏳' : '🚀'} {(uiTexts as any)[language].send}
           </button>
         </div>
-      )}
-      
-      {/* Example questions */}
-      <div className="bg-black/20 rounded-xl p-4 border border-amber-400">
-        <h3 className="text-amber-300 font-semibold mb-3">Quick Learning Ideas:</h3>
-        <div className="flex flex-wrap gap-3 justify-center">
-          {(messages as any)[language].examples.map((example: string, index: number) => (
-            <button
-              key={index}
-              onClick={() => setQuestion(example)}
-              style={{
-                backgroundColor: '#D97706',
-                color: 'white',
-                padding: '8px 16px',
-                border: 'none',
-                borderRadius: '8px',
-                fontSize: '14px',
-                cursor: 'pointer',
-                boxShadow: '0 2px 4px rgba(0, 0, 0, 0.1)'
-              }}
-              disabled={isThinking}
-            >
-              {example}
-            </button>
-          ))}
-        </div>
       </div>
     </div>
   );