diff --git a/.jules/sentinel.md b/.jules/sentinel.md
new file mode 100644
index 0000000..2e5cd63
--- /dev/null
+++ b/.jules/sentinel.md
@@ -0,0 +1,4 @@
+## 2025-05-15 - [Securing HMAC Secrets and CORS]
+**Vulnerability:** Hardcoded HMAC secret key and overly permissive CORS policy.
+**Learning:** Hardcoding production-level secrets in multiple files (`main.py` and `DivineoBunker.py`) creates a high risk of exposure. Permissive CORS (`"*"`) is acceptable for rapid prototyping but should be configurable for deployment to prevent unauthorized cross-origin access.
+**Prevention:** Use environment variables (via `os.getenv` and `python-dotenv`) for all sensitive credentials. Implement configurable CORS origins through environment variables, defaulting to specific origins in production.
diff --git a/backend/DivineoBunker.py b/backend/DivineoBunker.py
index ca01742..81cea01 100644
--- a/backend/DivineoBunker.py
+++ b/backend/DivineoBunker.py
@@ -2,11 +2,12 @@
 import hashlib
 import time
 import json
+import os
 
 class DivineoBunker:
     def __init__(self):
         # 🛡️ Configuración Maestra (abvetos.com)
-        self.secret_key = "LVT_SECRET_PROD_091228222"
+        self.secret_key = os.getenv("LVT_SECRET_KEY", "LVT_DEV_SECRET_DO_NOT_USE_IN_PROD")
         self.patent = "PCT/EP2025/067317"
         self.algorithm_v = "V10_Divineo_Shopify_Final"
         
diff --git a/backend/__pycache__/jules_engine.cpython-312.pyc b/backend/__pycache__/jules_engine.cpython-312.pyc
new file mode 100644
index 0000000..78615be
Binary files /dev/null and b/backend/__pycache__/jules_engine.cpython-312.pyc differ
diff --git a/backend/__pycache__/main.cpython-312.pyc b/backend/__pycache__/main.cpython-312.pyc
new file mode 100644
index 0000000..e289fa8
Binary files /dev/null and b/backend/__pycache__/main.cpython-312.pyc differ
diff --git a/backend/__pycache__/models.cpython-312.pyc b/backend/__pycache__/models.cpython-312.pyc
new file mode 100644
index 0000000..a439c33
Binary files /dev/null and b/backend/__pycache__/models.cpython-312.pyc differ
diff --git a/backend/main.py b/backend/main.py
index cb988e1..14aa881 100644
--- a/backend/main.py
+++ b/backend/main.py
@@ -2,24 +2,31 @@
 import hashlib
 import time
 import json
+import os
+from dotenv import load_dotenv
 from fastapi import FastAPI, HTTPException
 from fastapi.responses import JSONResponse
 from fastapi.middleware.cors import CORSMiddleware
 from models import UserScan, SHOPIFY_INVENTORY
 from jules_engine import get_jules_advice
 
+load_dotenv()
+
 app = FastAPI(title="Divineo Bunker Backend")
 
+# 🔒 Security: In production, configure LVT_ALLOWED_ORIGINS in .env
+ALLOWED_ORIGINS = os.getenv("LVT_ALLOWED_ORIGINS", "*").split(",")
+
 app.add_middleware(
     CORSMiddleware,
-    allow_origins=["*"],
+    allow_origins=ALLOWED_ORIGINS,
     allow_credentials=True,
     allow_methods=["*"],
     allow_headers=["*"],
 )
 
 # 🛡️ Configuración Maestra (abvetos.com)
-SECRET_KEY = "LVT_SECRET_PROD_091228222"
+SECRET_KEY = os.getenv("LVT_SECRET_KEY", "LVT_DEV_SECRET_DO_NOT_USE_IN_PROD")
 PATENT = "PCT/EP2025/067317"
 
 def verify_auth(user_id: str, token: str) -> bool:
@@ -68,7 +75,14 @@ async def recommend_garment(scan: UserScan, garment_id: str = "BALMAIN_SS26_SLIM
         # Usamos Jules para el toque de estilo
         styling_advice = get_jules_advice(scan, item)
     except Exception as e:
-        styling_advice = f"Divineo confirmado con {item['name']}."
+        return JSONResponse(
+            status_code=503,
+            content={
+                "status": "error",
+                "code": 503,
+                "message": "Jules AI Engine is currently recalibrating or unavailable. Please try again."
+            }
+        )
 
     if is_divineo and item['stock'] > 0:
         return {
diff --git a/backend/tests/__pycache__/test_main.cpython-312-pytest-9.0.2.pyc b/backend/tests/__pycache__/test_main.cpython-312-pytest-9.0.2.pyc
new file mode 100644
index 0000000..a8de80a
Binary files /dev/null and b/backend/tests/__pycache__/test_main.cpython-312-pytest-9.0.2.pyc differ
diff --git a/backend/tests/test_main.py b/backend/tests/test_main.py
index 8d756a9..6f60c36 100644
--- a/backend/tests/test_main.py
+++ b/backend/tests/test_main.py
@@ -1,9 +1,17 @@
 import pytest
+import hmac
+import hashlib
+import time
 from fastapi.testclient import TestClient
-from backend.main import app
+from backend.main import app, SECRET_KEY
 
 client = TestClient(app)
 
+def generate_test_token(user_id: str):
+    ts = str(int(time.time()))
+    sig = hmac.new(SECRET_KEY.encode(), f"{user_id}:{ts}".encode(), hashlib.sha256).hexdigest()
+    return f"{ts}.{sig}"
+
 def test_recommend_garment_engine_failure(monkeypatch):
     """
     Test that the /api/recommend endpoint correctly handles failures
@@ -18,9 +26,11 @@ def mock_get_jules_advice(*args, **kwargs):
     monkeypatch.setattr("backend.main.get_jules_advice", mock_get_jules_advice)
 
     # 2. Prepare the request payload
+    user_id = "test_user_123"
     payload = {
-        "height": 175.0,
-        "weight": 68.0,
+        "user_id": user_id,
+        "token": generate_test_token(user_id),
+        "waist": 72.0,
         "event_type": "Gala"
     }