Add feedback form + monochrome theme; keep API working

app.py

@@ -550,7 +550,7 @@ def process_receipt(image):
     if image is None:
         return (
             "<div style='padding: 20px; text-align: center;'>Upload an image to begin</div>",
-            None, "", ""
+            None, "", "", "<div style='padding: 40px; text-align: center; color: #6c757d;'>Upload an image to begin</div>"
         )
     
     if not isinstance(image, Image.Image):
@@ -677,7 +677,8 @@ def process_receipt(image):
     {fields_html}
     """
     
-    return summary_html, ocr_image, ocr_text, json.dumps(to_jsonable(results), indent=2)
+    safe_results = json.dumps(to_jsonable(results), indent=2)
+    return summary_html, ocr_image, ocr_text, safe_results, summary_html
 
 
 # ============================================================================
@@ -685,9 +686,14 @@ def process_receipt(image):
 # ============================================================================
 
 CUSTOM_CSS = """
-.gradio-container { max-width: 1200px !important; }
-.main-header { text-align: center; padding: 20px; background: linear-gradient(135deg, #667eea 0%, #764ba2 100%); 
-               border-radius: 12px; color: white; margin-bottom: 20px; }
+.gradio-container { max-width: 1200px !important; background: #0b0c0e; color: #e5e7eb; }
+.main-header { text-align: center; padding: 20px; background: linear-gradient(135deg, #0f172a 0%, #1f2937 100%); 
+               border-radius: 12px; color: #e5e7eb; margin-bottom: 20px; border: 1px solid #1f2937; }
+.gr-button { border-radius: 10px; background: #111827; color: #e5e7eb; border: 1px solid #1f2937; }
+.gr-button-primary { background: #111827; border: 1px solid #22c55e; color: #e5e7eb; }
+.gr-box { border: 1px solid #1f2937; background: #111827; }
+.gradio-accordion { border: 1px solid #1f2937 !important; background: #0f172a !important; }
+.gr-markdown { color: #e5e7eb; }
 """
 
 with gr.Blocks(title="Receipt Processing Agent", theme=gr.themes.Soft(), css=CUSTOM_CSS) as demo:
@@ -729,11 +735,61 @@ with gr.Blocks(title="Receipt Processing Agent", theme=gr.themes.Soft(), css=CUS
     
     with gr.Accordion("Raw Results (JSON)", open=False):
         results_json = gr.Textbox(label="Full Results", lines=15)
+
+    with gr.Accordion("Feedback", open=True):
+        gr.Markdown("Review the agent output below and submit a quick assessment.")
+        feedback_summary = gr.HTML(label="Last Agent Response (read-only)")
+        with gr.Row():
+            feedback_assessment = gr.Radio(
+                choices=["Correct", "Incorrect"],
+                label="Is the response correct?",
+                value=None
+            )
+            feedback_notes = gr.Textbox(
+                label="Notes (optional)",
+                placeholder="What should be improved or fixed?",
+                lines=3
+            )
+        feedback_status = gr.Markdown(value="")
+        submit_feedback = gr.Button("Submit Feedback", variant="primary")
     
     process_btn.click(
         fn=process_receipt,
         inputs=[input_image],
-        outputs=[agent_summary, ocr_image_output, ocr_text_output, results_json]
+        outputs=[agent_summary, ocr_image_output, ocr_text_output, results_json, feedback_summary]
+    )
+
+    def save_feedback(assessment, notes, results_json_str):
+        try:
+            parsed = json.loads(results_json_str) if results_json_str else {}
+        except Exception:
+            parsed = {"raw": results_json_str}
+        entry = {
+            "timestamp": datetime.utcnow().isoformat(),
+            "assessment": assessment or "",
+            "notes": notes or "",
+            "results": parsed,
+        }
+        # Append to local CSV; safe for Spaces ephemeral storage
+        import csv
+        fieldnames = ["timestamp", "assessment", "notes", "results"]
+        file_exists = os.path.exists("feedback_logs.csv")
+        with open("feedback_logs.csv", "a", newline="", encoding="utf-8") as f:
+            writer = csv.DictWriter(f, fieldnames=fieldnames)
+            if not file_exists:
+                writer.writeheader()
+            writer.writerow({
+                "timestamp": entry["timestamp"],
+                "assessment": entry["assessment"],
+                "notes": entry["notes"],
+                "results": json.dumps(entry["results"]),
+            })
+        return "✅ Feedback saved. (Stored in feedback_logs.csv)"
+
+    submit_feedback.click(
+        fn=save_feedback,
+        inputs=[feedback_assessment, feedback_notes, results_json],
+        outputs=feedback_status
     )
     
     gr.Markdown("""