✅ Fix: Update to correct Gemini API models (gemini-2.0-flash, gemini-1.5-flash, gemini-1.5-pro) + Clean minimal chat UI

app.py

@@ -164,82 +164,114 @@ body {
     font-size: 0.9rem !important;
 }
 
-/* Chat container */
+/* Chat container - Clean minimal design */
 .chat-container {
     background: white !important;
-    border-radius: 8px !important;
-    border: 1px solid var(--border) !important;
+    border-radius: 0 !important;
+    border: none !important;
+    padding: 0 !important;
 }
 
 .gradio-chatbot {
     background: white !important;
+    border-radius: 0 !important;
+    border: none !important;
+    padding: 20px !important;
+    height: 500px !important;
 }
 
 /* Chat wrapper */
 [data-testid="chatbot"] {
     background: white !important;
+    border-radius: 0 !important;
 }
 
 .gr-box.gr-input-box {
     background: white !important;
-    border: 1px solid var(--border) !important;
+    border: none !important;
+    border-top: 1px solid var(--border) !important;
 }
 
-/* Messages */
+/* Messages - Minimal, readable design */
 .message {
-    padding: 14px !important;
-    margin: 10px 0 !important;
-    border-radius: 6px !important;
-    line-height: 1.6 !important;
+    padding: 20px 0 !important;
+    margin: 0 !important;
+    border-radius: 0 !important;
+    line-height: 1.7 !important;
     color: var(--text-primary) !important;
+    background: transparent !important;
+    border: none !important;
+    font-size: 15px !important;
 }
 
 .message.user {
-    background: #f0f4f8 !important;
-    border-left: 4px solid var(--primary) !important;
-    margin-left: 30px !important;
+    background: transparent !important;
+    border: none !important;
+    margin: 20px 0 !important;
     color: var(--text-primary) !important;
+    text-align: right !important;
+    padding: 12px 16px !important;
+    background: #f3f4f6 !important;
+    border-radius: 8px !important;
 }
 
 .message.assistant {
     background: white !important;
-    border-left: 4px solid #10b981 !important;
-    margin-right: 30px !important;
+    border: none !important;
+    margin: 20px 0 !important;
     color: var(--text-primary) !important;
+    padding: 12px 16px !important;
+    text-align: left !important;
 }
 
 .message .prose, .message .prose * {
     color: var(--text-primary) !important;
     background: transparent !important;
+    font-size: 15px !important;
+    line-height: 1.7 !important;
+}
+
+.message a {
+    color: var(--primary) !important;
+    text-decoration: underline !important;
+}
+
+.message h1, .message h2, .message h3 {
+    color: var(--text-primary) !important;
+    font-weight: 600 !important;
+    margin: 12px 0 !important;
 }
 
-/* Input */
+/* Input - Clean minimal */
 .gr-textbox textarea {
     color: var(--text-primary) !important;
-    background: var(--bg-white) !important;
-    border: 1px solid var(--border) !important;
-    border-radius: 6px !important;
-    padding: 12px !important;
-    font-size: 14px !important;
+    background: white !important;
+    border: none !important;
+    border-top: 1px solid var(--border) !important;
+    border-radius: 0 !important;
+    padding: 16px !important;
+    font-size: 15px !important;
+    min-height: 50px !important;
 }
 
 .gr-textbox textarea:focus {
-    border-color: var(--primary) !important;
-    box-shadow: 0 0 0 2px rgba(30, 58, 138, 0.1) !important;
+    border-top: 1px solid var(--border) !important;
+    box-shadow: none !important;
+    outline: none !important;
 }
 
 .gr-textbox textarea::placeholder {
-    color: var(--text-secondary) !important;
+    color: #9ca3af !important;
 }
 
-/* Buttons */
+/* Buttons - Minimal style */
 .gr-button {
     background: var(--primary) !important;
     color: white !important;
     border: none !important;
     font-weight: 600 !important;
     border-radius: 6px !important;
-    padding: 10px 24px !important;
+    padding: 10px 20px !important;
 }
 
 .gr-button:hover {
@@ -247,13 +279,13 @@ body {
 }
 
 .gr-button.gr-button-secondary {
-    background: var(--bg-light) !important;
-    color: var(--primary) !important;
+    background: transparent !important;
+    color: var(--text-secondary) !important;
     border: 1px solid var(--border) !important;
 }
 
 .gr-button.gr-button-secondary:hover {
-    background: #e5e7eb !important;
+    background: var(--bg-light) !important;
 }
 
 /* Tables */

rag_engine.py

@@ -403,7 +403,7 @@ User Question: {query}
 Answer:"""
 
         try:
-            model = genai.GenerativeModel('gemini-1.5-flash-latest')
+            model = genai.GenerativeModel('gemini-2.0-flash')
             response = model.generate_content(system_prompt + "\n\n" + prompt)
             response_text = response.text
         except Exception as e:
@@ -416,14 +416,19 @@ Answer:"""
                 response_text = "❌ API Permission Error: Check your API key has proper permissions"
             elif "404" in error_msg or "not found" in error_msg or "not supported" in error_msg:
                 try:
-                    model = genai.GenerativeModel('gemini-pro')
+                    model = genai.GenerativeModel('gemini-1.5-flash')
                     response = model.generate_content(system_prompt + "\n\n" + prompt)
                     response_text = response.text
                 except Exception as e2:
-                    response_text = f"❌ Model Error: {str(e2)[:100]}"
+                    try:
+                        model = genai.GenerativeModel('gemini-1.5-pro')
+                        response = model.generate_content(system_prompt + "\n\n" + prompt)
+                        response_text = response.text
+                    except Exception as e3:
+                        response_text = f"❌ Model Error: No available models. {str(e3)[:60]}"
             else:
                 try:
-                    model = genai.GenerativeModel('gemini-pro')
+                    model = genai.GenerativeModel('gemini-1.5-flash')
                     response = model.generate_content(system_prompt + "\n\n" + prompt)
                     response_text = response.text
                 except Exception as e2: