{
  "schema": 2,
  "id": "L3_stomach",
  "name": "Stomach",
  "tagline": "The acid sea",
  "seed": 20260703,
  "par": { "time": 540, "score": 15000, "samples": 3 },
  "next": "L4_small_intestine",
  "design": {
    "owner": "Lane C",
    "status": "SKELETON (round 1) - shape only: biomes, lengths, arenas, boss placement, gate. Encounters, mucus-shallow lanes, churn cyclones and the pH field are round 2+. Do not read the (near-empty) events list as a design.",
    "identity": "The coat level. Ambient pH drains the mucus coat continuously, so position IS the resource: mucus shallows along the greater curvature pause the drain, open acid does not. Ends on the Pyloric Guardian.",
    "anatomy": "Cardia -> fundus -> body (greater/lesser curvature) -> antrum -> pyloric antrum -> pylorus. Real order, real proportions.",
    "biome_note": "biome = tissue/look family (Lane A's registry), segments[].name = the anatomy. There is no 'cardia' or 'pylorus' biome and there should not be. The cardia deliberately keeps the ESOPHAGUS palette so that the acid sea REVEALS itself: you arrive still in teal, and the world turns orange the moment the fundus opens out. Spending a biome id on the cardia would throw that reveal away.",
    "scale": "Real stomach is ~25cm long, ~15cm wide when full; arena radius 180 units = 36cm. The one place the 1 unit : 1 mm fiction nearly holds - the stomach is genuinely a room.",
    "open_question": "The body of the stomach is not a sphere and arenas[] currently only expresses spheres. Either A's arena primitive grows to a capsule/blob union, or L3 chains overlapping spheres. Flagged to Lane A in LANE_C_NOTES.md §-> Lane A - do not treat arenas[1] as final geometry."
  },
  "segments": [
    {
      "biome": "esophagus",
      "name": "Cardia",
      "length": 200,
      "radius": { "base": 12, "wobble": 0.2 },
      "curviness": 0.3,
      "flow": 8,
      "note": "You arrive through the cardiac sphincter with the reflux surge still behind you. Short, tube-mode, decompression after L2's finale. Still wearing the esophagus palette (see design.biome_note) - the orange hits when the fundus opens, not before."
    },
    {
      "biome": "stomach",
      "name": "Fundus",
      "length": 600,
      "radius": { "base": 40, "wobble": 0.25 },
      "curviness": 0.2,
      "flow": 3,
      "note": "The gas dome at the top of the stomach. First taste of 6DOF-in-acid, low density: a breather that happens to be lethal if you loiter in the open."
    },
    {
      "biome": "stomach",
      "name": "Body",
      "length": 900,
      "radius": { "base": 45, "wobble": 0.3 },
      "curviness": 0.2,
      "flow": 3,
      "note": "THE ACID SEA - the level's centrepiece and the biggest room in the game so far. Churn cyclones, pepsin swarms, and the mucus shallows hugging the greater curvature."
    },
    {
      "biome": "stomach",
      "name": "Antrum",
      "length": 500,
      "radius": { "base": 25, "wobble": 0.25 },
      "curviness": 0.35,
      "flow": 6,
      "note": "The stomach starts squeezing down toward the exit. Room shrinks, current returns, pressure builds into the boss."
    },
    {
      "biome": "stomach",
      "name": "Pyloric Antrum",
      "length": 300,
      "radius": { "base": 14, "wobble": 0.15 },
      "curviness": 0.25,
      "flow": 10,
      "note": "The Guardian's lair (see arenas[2]). The churn here is a current that pushes you at the walls for the whole fight."
    }
  ],
  "arenas": [
    { "at": 800, "radius": 70, "biome": "stomach", "note": "Fundus dome. Spans s 730-870." },
    { "at": 1250, "radius": 180, "biome": "stomach", "note": "The acid sea. Spans s 1070-1430. PROVISIONAL - a sphere is the wrong shape for the stomach body; see design.open_question." },
    { "at": 2350, "radius": 70, "biome": "stomach", "note": "Pyloric Guardian lair. Spans s 2280-2420." }
  ],
  "events": [
    { "s": 20, "type": "checkpoint", "name": "Cardia" },
    { "s": 2260, "type": "checkpoint", "name": "Pyloric Antrum", "note": "Checkpoint before the boss - the law, and the reason a Guardian wipe costs seconds and not minutes." },
    { "s": 2350, "type": "boss", "id": "pyloric_guardian", "note": "Full phase spec (phases / telegraphs / windows / failure pressure) in LANE_C_NOTES.md §Boss specs." },
    { "s": 2480, "type": "gate", "id": "pylorus", "to": "L4_small_intestine" }
  ]
}