## MODIFIED Requirements

### Requirement: OAuth2/OIDC Flow

The system SHALL support OAuth2/OIDC authentication via Authentik with fully configurable endpoints.

#### Scenario: User login
- GIVEN a user clicks the login button
- WHEN the frontend redirects to Authentik authorization endpoint
- THEN the redirect URI SHALL be constructed from environment-configured domains
- AND the Authentik authorize URL SHALL be read from environment variables

#### Scenario: Token exchange and validation
- GIVEN Authentik has redirected with authorization code
- WHEN the callback endpoint receives the code
- THEN it exchanges the code for provider tokens at the configured token URL
- AND verifies token signature using the configured JWKS URL
- AND validates the issuer and audience from environment configuration

### Requirement: Session Security

The system SHALL protect sessions using httpOnly cookies with environment-aware secure defaults.

#### Scenario: Cookie attributes in production
- GIVEN successful authentication behind Traefik with HTTPS
- WHEN cookies are set
- THEN access_token cookie SHALL be httpOnly
- AND access_token cookie SHALL have Secure flag based on environment
- AND access_token cookie SHALL have SameSite based on environment
