graph TD
    subgraph Presentation
        MAIN[main.rs]
        ROUTES[routes/]
        EXTRACT[extractors]
        OPENAPI[OpenAPI / Scalar]
        SPA[SPA static files]
    end

    subgraph Application
        SONGS_UC[songs/]
        TABS_UC[tabs/]
        AUTH_UC[auth/]
    end

    subgraph Domain
        MODELS[models/]
        VO[value_objects/]
        PORTS[ports/]
        SERVICES[services/]
        ERRORS[errors/]
    end

    subgraph Adapters
        SQLITE[(SQLite)]
        UG[UG Parser]
        JWT[JWT + Argon2]
    end

    subgraph "Shared Crates"
        API_TYPES[api-types]
        INFRA[infra-wiring]
    end

    subgraph Frontend
        REACT[React SPA]
    end

    MAIN --> ROUTES
    MAIN --> OPENAPI
    ROUTES --> EXTRACT
    ROUTES --> SONGS_UC
    ROUTES --> TABS_UC
    ROUTES --> AUTH_UC
    ROUTES --> API_TYPES

    SONGS_UC --> PORTS
    TABS_UC --> PORTS
    AUTH_UC --> PORTS

    PORTS --> MODELS
    PORTS --> VO
    PORTS --> ERRORS
    SERVICES --> MODELS
    SERVICES --> VO

    SQLITE -.->|implements| PORTS
    UG -.->|implements| PORTS
    JWT -.->|implements| PORTS

    MAIN --> INFRA
    MAIN --> SPA
    REACT -->|/api/*| ROUTES
    SPA -->|serves| REACT