Update app.py

app.py

@@ -3,10 +3,11 @@ import openai
 import json
 import random
 from datetime import datetime
+import os
 
 # Configure OpenRouter API
 openai.api_base = "https://openrouter.ai/api/v1"
-openai.api_key = "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"  # Replace with your actual key
+openai.api_key = os.environ.get("OPENROUTER_API_KEY")
 
 class ScienceTalkGame:
     def __init__(self):