diff --git a/__pycache__/server.cpython-312.pyc b/__pycache__/server.cpython-312.pyc
index dd5afa9..250dae2 100644
Binary files a/__pycache__/server.cpython-312.pyc and b/__pycache__/server.cpython-312.pyc differ
diff --git a/server.py b/server.py
index c0562ce..298f7fc 100644
--- a/server.py
+++ b/server.py
@@ -60,11 +60,29 @@ async def lifespan(app: FastAPI):
     # Shutdown
     logger.info("Application shutdown")
 
+# Environment detection
+ENVIRONMENT = os.environ.get('ENVIRONMENT', 'development')
+IS_PRODUCTION = ENVIRONMENT == 'production'
+
+# Security: Disable API documentation in production
+if IS_PRODUCTION:
+    print("🔒 Production mode: API documentation disabled")
+    app_config = {
+        "lifespan": lifespan,
+        "root_path": "/membership",
+        "docs_url": None,  # Disable /docs
+        "redoc_url": None,  # Disable /redoc
+        "openapi_url": None  # Disable /openapi.json
+    }
+else:
+    print("🔓 Development mode: API documentation enabled at /docs and /redoc")
+    app_config = {
+        "lifespan": lifespan,
+        "root_path": "/membership"
+    }
+
 # Create the main app
-app = FastAPI(
-    lifespan=lifespan,
-    root_path="/membership"  # Configure for serving under /membership path
-)
+app = FastAPI(**app_config)
 
 # Create a router with the /api prefix
 api_router = APIRouter(prefix="/api")
@@ -790,6 +808,53 @@ async def get_config():
         "max_file_size_mb": int(max_file_size_mb)
     }
 
+@api_router.get("/diagnostics/cors")
+async def cors_diagnostics(request: Request):
+    """
+    CORS Diagnostics Endpoint
+    Shows current CORS configuration and request details for debugging
+
+    Use this to verify:
+    1. What origins are allowed
+    2. What origin is making the request
+    3. Whether CORS is properly configured
+    """
+    cors_origins_env = os.environ.get('CORS_ORIGINS', '')
+
+    if cors_origins_env:
+        configured_origins = [origin.strip() for origin in cors_origins_env.split(',')]
+        cors_status = "✅ CONFIGURED"
+    else:
+        configured_origins = [
+            "http://localhost:3000",
+            "http://localhost:8000",
+            "http://127.0.0.1:3000",
+            "http://127.0.0.1:8000"
+        ]
+        cors_status = "⚠️ NOT CONFIGURED (using defaults)"
+
+    request_origin = request.headers.get('origin', 'None')
+    origin_allowed = request_origin in configured_origins
+
+    return {
+        "cors_status": cors_status,
+        "environment": ENVIRONMENT,
+        "cors_origins_env_variable": cors_origins_env or "(not set)",
+        "allowed_origins": configured_origins,
+        "request_origin": request_origin,
+        "origin_allowed": origin_allowed,
+        "diagnosis": {
+            "cors_configured": bool(cors_origins_env),
+            "origin_matches": origin_allowed,
+            "issue": None if origin_allowed else f"Origin '{request_origin}' is not in allowed origins list"
+        },
+        "fix_instructions": None if origin_allowed else (
+            f"Add to backend .env file:\n"
+            f"CORS_ORIGINS={request_origin}"
+            f"{(',' + ','.join(configured_origins)) if cors_origins_env else ''}"
+        )
+    }
+
 # User Profile Routes
 @api_router.get("/users/profile", response_model=UserResponse)
 async def get_profile(current_user: User = Depends(get_current_user)):
@@ -6236,10 +6301,77 @@ async def stripe_webhook(request: Request, db: Session = Depends(get_db)):
 # Include the router in the main app
 app.include_router(api_router)
 
+# ============================================================================
+# MIDDLEWARE CONFIGURATION
+# ============================================================================
+# IMPORTANT: In FastAPI, middleware is executed in REVERSE order of addition
+# Last added = First executed
+# So we add them in this order: Security Headers -> CORS
+# Execution order will be: CORS -> Security Headers
+
+# Security Headers Middleware (Added first, executes second)
+@app.middleware("http")
+async def add_security_headers(request: Request, call_next):
+    response = await call_next(request)
+
+    # Security headers to protect against common vulnerabilities
+    security_headers = {
+        # Prevent clickjacking attacks
+        "X-Frame-Options": "DENY",
+
+        # Prevent MIME type sniffing
+        "X-Content-Type-Options": "nosniff",
+
+        # Enable XSS protection in older browsers
+        "X-XSS-Protection": "1; mode=block",
+
+        # Control referrer information
+        "Referrer-Policy": "strict-origin-when-cross-origin",
+
+        # Permissions policy (formerly Feature-Policy)
+        "Permissions-Policy": "geolocation=(), microphone=(), camera=()",
+    }
+
+    # Add HSTS header in production (force HTTPS)
+    if IS_PRODUCTION:
+        security_headers["Strict-Transport-Security"] = "max-age=31536000; includeSubDomains"
+
+    # Apply all security headers
+    for header, value in security_headers.items():
+        response.headers[header] = value
+
+    # Remove server identification headers (use del, not pop for MutableHeaders)
+    if "Server" in response.headers:
+        del response.headers["Server"]
+
+    return response
+
+print(f"✓ Security headers configured (Production: {IS_PRODUCTION})")
+
+# CORS Configuration (Added second, executes first)
+cors_origins = os.environ.get('CORS_ORIGINS', '')
+if cors_origins:
+    # Use explicitly configured origins
+    allowed_origins = [origin.strip() for origin in cors_origins.split(',')]
+else:
+    # Default to common development origins if not configured
+    allowed_origins = [
+        "http://localhost:3000",
+        "http://localhost:8000",
+        "http://127.0.0.1:3000",
+        "http://127.0.0.1:8000"
+    ]
+    print(f"⚠️  WARNING: CORS_ORIGINS not set. Using defaults: {allowed_origins}")
+    print("⚠️  For production, set CORS_ORIGINS in .env file!")
+
+print(f"✓ CORS allowed origins: {allowed_origins}")
+
 app.add_middleware(
     CORSMiddleware,
     allow_credentials=True,
-    allow_origins=os.environ.get('CORS_ORIGINS', '*').split(','),
-    allow_methods=["*"],
+    allow_origins=allowed_origins,
+    allow_methods=["GET", "POST", "PUT", "DELETE", "OPTIONS", "PATCH"],
     allow_headers=["*"],
+    expose_headers=["*"],
+    max_age=600,  # Cache preflight requests for 10 minutes
 )
\ No newline at end of file