= UseCase03 - Login
** Initiating actor: Guest **
== Description
A guest can browse the system in read-only mode. When the guest tries to perform a restricted action, the system requires authentication. The guest logs in by providing credentials; the system verifies them and starts an authenticated session. After login, the user can perform actions allowed by their role (e.g. client). If login fails, access remains read-only.
== Scenario
1. Guest goes to the login page.
2. Guest submits credentials.
3. The guest now becomes a client and can perform actions that are not read-only.