{
  "schema": 2,
  "id": "L1_mouth",
  "name": "Oral Cavity",
  "tagline": "Learn to swim",
  "seed": 20260701,
  "par": { "time": 300, "score": 6000, "samples": 3 },
  "next": "L2_esophagus",
  "design": {
    "owner": "Lane C",
    "status": "SKELETON (round 1) - shape only: biomes, lengths, arenas, gate. Encounters, pickups, samples and tutorial beats are round 2+, after Lane B's arena-mode controller exists. Do not read the (near-empty) events list as a design.",
    "identity": "The tutorial, and the only level that is mostly arena. Teaches move / shoot / coat in safety, then examines all three at the epiglottis.",
    "anatomy": "Vestibule (outside the teeth) -> oral cavity proper (the arena, ringed by molars) -> oropharynx, narrowing to the epiglottis gate.",
    "biome_note": "biome = tissue/look family (Lane A's registry), segments[].name = the anatomy. There is no 'pharynx' biome and there should not be: the oropharynx is deliberately given the ESOPHAGUS palette so the tube turns teal as you approach the epiglottis. The colour shift is the wayfinding - it tells you where you are going before the gate does.",
    "scale": "Real oral cavity is ~8cm across; arena radius 90 units = 18cm diameter. Dilated ~2x - much less than L2's 14x, because arenas need room to fight in and the mouth is already a room.",
    "round2_plan": "Molar crush-cycles as timed hazards on the arena rim, saliva tides as a periodic current that sweeps the arena, amylase droplets as the tutorial floater. The epiglottis gate is a timing exam: dive on the swallow. 3 samples: one behind the molars, one in a tonsillar crypt, one under the tongue."
  },
  "segments": [
    {
      "biome": "oral",
      "name": "Vestibule",
      "length": 120,
      "radius": { "base": 14, "wobble": 0.1 },
      "curviness": 0.1,
      "flow": 2,
      "note": "Injection point. Almost no current - the player's first 120 units are the only place in the game where nothing is pushing them anywhere."
    },
    {
      "biome": "oral",
      "name": "Oral Cavity",
      "length": 400,
      "radius": { "base": 30, "wobble": 0.2 },
      "curviness": 0.15,
      "flow": 2,
      "note": "The arena (see arenas[0]). 6DOF unlocks here. Molar crush-cycles ring it; saliva tides sweep it."
    },
    {
      "biome": "esophagus",
      "name": "Oropharynx",
      "length": 200,
      "radius": { "base": 12, "wobble": 0.2 },
      "curviness": 0.35,
      "flow": 6,
      "note": "The funnel. Mode returns to tube and the current starts to build - the game re-teaching flow just before the gate hands the player to L2. Wears the ESOPHAGUS palette on purpose (see design.biome_note): the walls go teal 200 units before the epiglottis, so the player reads the transition in colour before they read it in a HUD."
    }
  ],
  "arenas": [
    { "at": 320, "radius": 90, "biome": "oral", "note": "The oral cavity proper. Spans s 230-410 (sphere of radius 90 centred at s=320)." }
  ],
  "events": [
    { "s": 20, "type": "checkpoint", "name": "Injection Point" },
    { "s": 700, "type": "gate", "id": "epiglottis", "to": "L2_esophagus", "note": "The exam: dive through on the swallow. Timing gate, not a boss." }
  ]
}