flowchart TD
root(["CompteProducteur"]):::root
n0["Contrat"]:::envelope
root --> n0
n1["Intermédiaire"]:::group
n0 --> n1
classDef root     fill:#2563eb,color:#fff,stroke:none,rx:8,font-weight:bold
classDef envelope fill:#f1f5f9,color:#334155,stroke:#94a3b8,font-weight:bold
classDef group    fill:#eff6ff,color:#1e40af,stroke:#93c5fd