1%%{init: {'theme': 'base', 'themeVariables': {'primaryColor': '#e8f5e9', 'primaryBorderColor': '#4caf50', 'lineColor': '#333'}}}%%
2graph TD
3    classDef input fill:#e3f2fd,stroke:#1976d2,color:#0d47a1
4    classDef process fill:#fff3e0,stroke:#f57c00,color:#e65100
5    classDef output fill:#e8f5e9,stroke:#4caf50,color:#1b5e20
6
7    A[receive request]:::input --> B{validate}:::process
8    B -->|valid| C[process data]:::process
9    B -->|invalid| D[return error]:::output
10    C --> E[send response]:::output
11
12    style B fill:#fce4ec,stroke:#c62828