🔒 manage secret and port via environment variables

app.py

@@ -1,10 +1,11 @@
+import os
 from flask import Flask, render_template, abort
 from comics_data import COMICS
 
 app = Flask(__name__)
 
 # Configuration
-app.config['SECRET_KEY'] = 'your-secret-key-here'  # Change this in production
+app.config['SECRET_KEY'] = os.environ.get('SECRET_KEY', 'your-secret-key')
 
 
 def get_comic_by_number(number):
@@ -65,4 +66,5 @@ def page_not_found(e):
 
 
 if __name__ == '__main__':
-    app.run(debug=True, port=3000)
+    port = int(os.environ.get('PORT', 3000))
+    app.run(debug=True, port=port)