diff --git a/app/config.py b/app/config.py
new file mode 100644
index 0000000..637743f
--- /dev/null
+++ b/app/config.py
@@ -0,0 +1,24 @@
+import os
+
+# All comments are in English.
+
+class Config:
+    """Base configuration for the Flask application."""
+
+    # Secret key for sessions and cookies.
+    SECRET_KEY = os.getenv("FLASK_SECRET_KEY", "change-this-secret")
+
+    # Google OAuth configuration.
+    #GOOGLE_CLIENT_ID = os.getenv("GOOGLE_CLIENT_ID", "")
+    #GOOGLE_CLIENT_SECRET = os.getenv("GOOGLE_CLIENT_SECRET", "")
+    #GOOGLE_REDIRECT_URI = os.getenv("GOOGLE_REDIRECT_URI", "")
+
+    # Ollama base URL (HTTP endpoint).
+    OLLAMA_BASE_URL = os.getenv("OLLAMA_BASE_URL", "http://host.docker.internal:11434")
+
+    # Allowed models mapping (user-facing name -> Ollama model identifier).
+    MODEL_MAP = {
+        "llama3.2": "llama3.2",
+        "gemma4": "gemma4",
+        "qwen2.5": "qwen2.5",
+    }