graph LR
    user(["user"])

    subgraph swarm["  Docker Swarm  "]
        nginx["nginx\nreverse proxy\nmktsum.yxnliu.net"]
        backend["backend\nHono · Drizzle\n/v1/*"]
        engine["engine\ndaily cron · Bun"]
        notifier["notifier\nntfy client"]
        pg[("postgres\nbriefings · users · tickers")]
    end

    subgraph ext["  external  "]
        direction LR
        rss["RSS feeds"]
        LLM["LLM API"]
        ntfy["ntfy"]
        rss ~~~ LLM ~~~ ntfy
    end

    user -->|"HTTPS"| nginx
    nginx -->|"/v1/*"| backend
    backend <--> pg
    engine -->|"fetch"| rss
    rss -->|"articles"| engine
    engine -->|"prompt"| LLM
    LLM -->|"summary"| engine
    engine -->|"writes briefings"| pg
    engine --> notifier
    notifier --> ntfy
    ntfy -->|"push"| user

    style swarm fill:transparent,stroke:#B4B2A9,stroke-dasharray:4 3
    style ext fill:transparent,stroke:#B4B2A9,stroke-dasharray:4 3

    classDef cgr fill:#F1EFE8,stroke:#888780,color:#2C2C2A
    classDef cpu fill:#EEEDFE,stroke:#534AB7,color:#26215C
    classDef cte fill:#E1F5EE,stroke:#0F6E56,color:#04342C
    classDef cam fill:#FAEEDA,stroke:#854F0B,color:#412402
    classDef cco fill:#FAECE7,stroke:#993C1D,color:#4A1B0C
    classDef cbl fill:#E6F1FB,stroke:#185FA5,color:#042C53

    class user cgr
    class nginx cpu
    class backend cte
    class engine cam
    class notifier,ntfy cco
    class pg cbl
    class rss,LLM cgr