digraph nvi {
  rankdir=TB;
  bgcolor="#161b22";
  fontname="JetBrains Mono";
  fontcolor="#c9d1d9";
  node [
    shape=box,
    style="rounded,filled",
    fillcolor="#21262d",
    color="#30363d",
    fontname="JetBrains Mono",
    fontcolor="#c9d1d9",
    fontsize=11,
  ];
  edge [color="#8b949e", fontname="JetBrains Mono", fontcolor="#8b949e", fontsize=10];

  user [label="user question", fillcolor="#1f6feb", fontcolor="#ffffff"];

  subgraph cluster_l3 {
    label="L3 — Plan";
    color="#30363d";
    fontcolor="#58a6ff";
    fontsize=11;
    plan [label="planner\n(1 LLM call)"];
  }

  subgraph cluster_l2 {
    label="L2 — Analyses (mini-agents)";
    color="#30363d";
    fontcolor="#58a6ff";
    fontsize=11;
    compare [label="compare_periods\n(CoT)"];
    drill   [label="drill_down\n(ReAct)"];
    outl    [label="find_outliers\n(CoT)"];
    corr    [label="correlate\n(plan-and-execute)"];
  }

  subgraph cluster_l1 {
    label="L1 — Tools (deterministic)";
    color="#30363d";
    fontcolor="#58a6ff";
    fontsize=11;
    t2s    [label="text_to_sql"];
    exec   [label="execute_sql"];
    schema [label="retrieve_schema"];
    py     [label="python_sandbox"];
  }

  warehouse [label="Postgres\nBIRD financial", fillcolor="#388bfd33"];
  langfuse [label="Langfuse (lng, WG)", fillcolor="#bf4b8a33", fontcolor="#ffffff"];
  synth [label="synthesize\nfindings → answer"];

  user -> plan;
  plan -> compare; plan -> drill; plan -> outl; plan -> corr;
  compare -> t2s; drill -> t2s; outl -> t2s; corr -> t2s;
  drill -> schema [style=dashed];
  corr -> py [style=dashed];
  t2s -> exec;
  exec -> warehouse;
  compare -> synth; drill -> synth; outl -> synth; corr -> synth;

  plan -> langfuse [style=dotted, label="spans"];
  compare -> langfuse [style=dotted];
  exec -> langfuse [style=dotted];
}