{
  "xzbt": "0.1",
  "meta": {
    "id": "minimal-visual",
    "name": "Minimal Visual",
    "version": "1.0.0",
    "author": "XZBT",
    "description": "A minimal generic exhibit exercising the visual contract surface that Stage 0 aligns: the scene and layer model, a graphic system, a procedural system, a declared field, a spawned template with its spawn container, exhibit- and system-scope automation, the post-effect chain, and the four external target families.",
    "license": "CC0-1.0",
    "tags": ["minimal", "visual"]
  },
  "runtime": {
    "seed": 42
  },
  "parameters": {
    "depth": {
      "type": "number",
      "default": 1,
      "min": 0.5,
      "max": 2,
      "step": 0.01,
      "label": "Field depth"
    }
  },
  "state": {
    "intensity": { "type": "number", "initial": 0.35, "min": 0, "max": 1 }
  },
  "bindings": [
    { "source": "parameters.depth", "target": "visuals.camera.zoom" },
    { "source": "state.intensity", "target": "visuals.layers.near.opacity" },
    { "source": "state.intensity", "target": "visuals.effects[0].amount", "scale": 0.6 }
  ],
  "components": {
    "visual": {
      "panel": {
        "parameters": {
          "tint": { "type": "color", "default": "#3a6ea5" },
          "lit": { "type": "boolean", "default": false }
        },
        "content": {
          "frame": {
            "type": "rounded-rectangle",
            "size": { "width": 24, "height": 16 },
            "radius": 2,
            "style": { "fill": { "ref": "inputs.tint" }, "stroke": "#0b1118" }
          }
        }
      }
    }
  },
  "visuals": {
    "scene": {
      "coordinateSpace": "virtual",
      "width": 1600,
      "height": 900,
      "fit": "contain",
      "background": "#020308",
      "depthFog": { "color": "#020308", "near": 200, "far": 1400, "density": 0.8 }
    },
    "layers": {
      "far": { "parallax": 0.2 },
      "near": { "opacity": 1 }
    },
    "camera": {
      "x": 800,
      "y": 450,
      "zoom": 1,
      "projection": "perspective",
      "focalLength": 1200
    },
    "fields": {
      "current": {
        "type": "noise",
        "scale": 220,
        "speed": 0.08,
        "octaves": 3,
        "persistence": 0.5,
        "amplitude": 40,
        "mode": "curl"
      }
    },
    "systems": {
      "horizon": {
        "type": "graphic",
        "layer": "far",
        "content": {
          "band": {
            "type": "rectangle",
            "position": { "x": 0, "y": 620 },
            "size": { "width": 1600, "height": 4 },
            "style": { "fill": "#1d2b3a" }
          }
        },
        "automation": [
          {
            "target": "band.style.opacity",
            "interpolation": "smooth",
            "loop": { "mode": "ping-pong", "count": "infinite" },
            "points": [
              { "at": "0ms", "value": 0.4 },
              { "at": "12s", "value": 0.9 }
            ]
          }
        ]
      },
      "wall": {
        "type": "repeater",
        "layer": "far",
        "repeat": {
          "type": "component",
          "component": "panel",
          "inputs": {
            "lit": { "choose": [{ "value": true, "weight": 1 }, { "value": false, "weight": 3 }] }
          }
        },
        "count": 96,
        "distribution": {
          "type": "grid",
          "origin": { "x": 120, "y": 90 },
          "columns": 12,
          "rows": 8,
          "spacing": { "x": 34, "y": 26 }
        }
      },
      "motes": {
        "type": "particles",
        "layer": "near",
        "capacity": 400,
        "count": 400,
        "lifetime": "12s",
        "fields": ["current"],
        "distribution": {
          "type": "rectangle",
          "center": { "x": 800, "y": 450 },
          "size": { "width": 1600, "height": 900 }
        },
        "velocity": { "x": { "random": { "min": -6, "max": 6 } }, "y": { "random": { "min": 4, "max": 18 } } },
        "drag": 0.05,
        "render": { "type": "point", "style": { "fill": "#cfe4ff" } },
        "automation": [
          {
            "target": "drag",
            "mode": "absolute",
            "points": [
              { "at": "0ms", "value": 0.05 },
              { "at": "20s", "value": 0.25 }
            ]
          }
        ]
      },
      "flare": {
        "type": "emitter",
        "layer": "near",
        "lifecycle": "spawned",
        "spawn": {
          "lifetime": "6s",
          "release": "400ms",
          "ownership": "persistent",
          "cancelWithScenario": false,
          "inputs": {
            "tint": { "type": "color", "default": "#ffcf9b" }
          }
        },
        "emit": {
          "type": "component",
          "component": "panel",
          "inputs": { "tint": { "ref": "inputs.tint" } }
        },
        "rate": 6,
        "burst": [{ "at": "0s", "count": 24 }],
        "capacity": 120,
        "lifetime": "2s",
        "distribution": { "type": "ellipse", "center": { "x": 400, "y": 300 }, "radius": 40 },
        "velocity": { "x": { "random": { "min": -30, "max": 30 } }, "y": -80 }
      }
    },
    "effects": [
      { "type": "vignette", "amount": 0.45, "radius": 0.7 },
      { "type": "bloom", "threshold": 0.7, "intensity": 0.5, "radius": 8 }
    ],
    "automation": [
      {
        "target": "camera.zoom",
        "mode": "scale",
        "interpolation": "smooth",
        "loop": { "mode": "ping-pong", "count": "infinite" },
        "points": [
          { "at": "0ms", "value": 1 },
          { "at": "24s", "value": 1.35 }
        ]
      },
      {
        "target": "layers.far.parallax",
        "points": [
          { "at": "0ms", "value": 0.2 },
          { "at": "18s", "value": 0.35 }
        ]
      }
    ]
  }
}