flowchart LR
    INPUT(["drug_a + drug_b"])
    ENCODE["encode_pair<br/>193 trits"]
    A["<b>A bundle</b><br/>193 → 256 → 5<br/>gate"]
    B["<b>B bundle</b><br/>193 → 64 → 5<br/>specialist"]
    DISPATCH{{"cascade<br/>dispatch"}}
    OUT(["BitNetResult<br/>+ repro_hash"])

    INPUT --> ENCODE
    ENCODE --> A
    ENCODE --> B
    A -->|"if contra"| DISPATCH
    B -->|"else argmax"| DISPATCH
    DISPATCH --> OUT

    classDef io fill:#EFF6FF,stroke:#2563eb,color:#1e3a8a,stroke-width:2px
    classDef enc fill:#F0FDFA,stroke:#0F766E,color:#134E4A,stroke-width:2px
    classDef bundleA fill:#FEF2F2,stroke:#dc2626,color:#7f1d1d,stroke-width:2px
    classDef bundleB fill:#EFF6FF,stroke:#2563eb,color:#1e3a8a,stroke-width:2px
    classDef disp fill:#FEF3C7,stroke:#d97706,color:#7c2d12,stroke-width:2px
    classDef result fill:#F0FDF4,stroke:#16a34a,color:#14532d,stroke-width:2px

    class INPUT,OUT io
    class ENCODE enc
    class A bundleA
    class B bundleB
    class DISPATCH disp