graph LR
    E["🔍 Empathize"]:::empathize --> D["🎯 Define"]:::define
    D --> I["💡 Ideate"]:::ideate
    I --> P["🔧 Prototype"]:::prototype
    P --> T["📋 Test"]:::test
    T -.->|"Iterate!"| E

    classDef empathize fill:#4caf50,stroke:#2e7d32,color:#fff,rx:12,ry:12
    classDef define fill:#2196f3,stroke:#1565c0,color:#fff,rx:12,ry:12
    classDef ideate fill:#ff9800,stroke:#e65100,color:#fff,rx:12,ry:12
    classDef prototype fill:#9c27b0,stroke:#6a1b9a,color:#fff,rx:12,ry:12
    classDef test fill:#f44336,stroke:#c62828,color:#fff,rx:12,ry:12