Smoothie as one reading system.

flowchart TB
    U([User])

    subgraph APP[ Smoothie App ]
        direction TB

        subgraph HOME[Home]
            H1[For you
Prefetched ready-to-read articles]
            H2[Library
Queued / Reading / Finished]
            H3[Search / Import / Clipboard tray]
            H4[Settings entry]
        end

        subgraph READER[Reader]
            R1[Original mode
Default reading mode]
            R2[Optimized mode
Optional best-reading version]
            R3[Alternates
Optional on-demand layouts]
            R4[Inline smoothing
Original mode only]
            R5[Auto-scroll
Prompter-style reading assist]
            R6[Focus assist
Recovery / checkpoint / rescue]
            R7[Progress + scroll state]
        end

        subgraph SETTINGS[Settings]
            S1[API key]
            S2[Knowledge level]
            S3[Theme]
            S4[Focus assist toggle]
            S5[Prepare Optimized on open]
            S6[Smoothing language]
            S7[Discovery topics]
            S8[Trusted sources]
            S9[Auto-scroll speed]
        end

        subgraph DISCOVERY[Discovery Engine]
            D1[Curated sources / feeds / archives]
            D2[Fetch discovery candidates]
            D3[Rank using topics + trusted sources + reading behavior]
            D4[Prefetch top picks]
            D5[Deliver ready articles to For you]
        end

        subgraph INGEST[Ingestion Engine]
            I1[File import]
            I2[Clipboard import]
            I3[Search-generated article]
            I4[Extract / clean / parse]
            I5[Save as article]
        end

        subgraph INTEL[Reading Intelligence]
            A1[Search article generation]
            A2[Smoothing model]
            A3[Article understanding]
            A4[Optimize decision
Heuristics + model]
            A5[Optimized article generation]
            A6[Alternate generation]
            A7[Author intent / representation reasoning]
        end

        subgraph DATA[Local Data]
            L1[Article library]
            L2[Discovery candidates]
            L3[User preferences]
            L4[Cached optimized article]
            L5[Cached alternate payloads]
            L6[Reading progress + scroll position]
            L7[Smoothed text state]
        end
    end

    subgraph EXT[External Sources / Models]
        E1[Publisher feeds / archives]
        E2[Imported files / clipboard text]
        E3[LLM providers]
    end

    U --> HOME
    U --> READER
    U --> SETTINGS

    H1 --> READER
    H2 --> READER
    H3 --> INGEST
    H4 --> SETTINGS

    SETTINGS --> L3

    E1 --> D1
    D1 --> D2
    D2 --> D3
    L3 --> D3
    L1 --> D3
    D3 --> D4
    D4 --> I4
    I5 --> D5
    D5 --> H1

    E2 --> I1
    E2 --> I2
    H3 --> I3
    I3 --> A1
    A1 --> I4
    I1 --> I4
    I2 --> I4
    I4 --> I5
    I5 --> L1
    L1 --> H2

    READER --> R1
    READER --> R2
    READER --> R3
    READER --> R4
    READER --> R5
    READER --> R6
    READER --> R7

    R1 --> L1
    R7 --> L6
    L6 --> R7

    R4 --> A2
    A2 --> L7
    L7 --> R1
    R4 -. marks stale .-> L4

    R2 --> A3
    A3 --> A4
    A4 -->|worth optimizing| A5
    A5 --> L4
    L4 --> R2
    A4 -->|not needed| R1

    R3 --> A6
    A3 --> A7
    A7 --> A6
    A6 --> L5
    L5 --> R3

    R5 --> L6
    R6 --> L3

    E3 --> A1
    E3 --> A2
    E3 --> A3
    E3 --> A5
    E3 --> A6

    classDef app fill:#1f2630,stroke:#46586f,color:#e6edf3,stroke-width:1px;
    classDef user fill:#f59e0b,stroke:#fcd34d,color:#0d1117,stroke-width:1px;
    classDef ext fill:#142033,stroke:#3b82f6,color:#dbeafe,stroke-width:1px;
    classDef data fill:#10221b,stroke:#34d399,color:#d1fae5,stroke-width:1px;
    classDef intel fill:#2a1b12,stroke:#f97316,color:#ffedd5,stroke-width:1px;

    class U user;
    class HOME,READER,SETTINGS,DISCOVERY,INGEST app;
    class DATA,L1,L2,L3,L4,L5,L6,L7 data;
    class INTEL,A1,A2,A3,A4,A5,A6,A7 intel;
    class EXT,E1,E2,E3 ext;