{
  "_comment": "Build console (the deck's BUILD button on a planet surface → js/ui/BuildWindow.js). Research UNLOCKS a build (data/research/*.json → unlocks.builds); building then COSTS resources + time on a planet and applies the effect (e.g. the level-2 tether). Pure rules/state: js/build/BuildModel.js + BuildState.js (dev/builds.test.mjs). One build at a time (maxConcurrent), ticked by the SurfaceScene while on the surface; the state (js/scenes/GameScene.js → buildState) outlives the stay and saves with the run.",

  "enabled": true,

  "timeUnit": "seconds",
  "maxConcurrent": 1,

  "categories": [
    {
      "id": "planet",
      "label": "Planet",
      "accent": "#ffc94d"
    },
    {
      "id": "cargo",
      "label": "Cargo",
      "accent": "#7ce8a4"
    },
    {
      "id": "mining",
      "label": "Mining",
      "accent": "#ff8a3d"
    }
  ],
  "defaultCategory": "planet",

  "video": {
    "file": "assets/videos/build.mp4",
    "aspect": [2, 3]
  },

  "resources": {
    "credits": {
      "label": "Credits",
      "icon": "credit",
      "color": "#7ce8a4"
    },
    "minerals": {
      "label": "Minerals",
      "icon": "mineral",
      "color": "#00e5ff"
    }
  },

  "builds": {
    "tether-l1": {
      "label": "Tether - Level 1",
      "description": "The world's first tether: a level-1 field (range 5120 px) anchoring the ship's travel rim around the planet. The home world ships with it already in place; on every other world this is the build that installs it.",
      "icon": "tether",
      "category": "planet",
      "targets": ["planet"],
      "cost": {},
      "duration": 0,
      "requires": [],
      "repeatable": false,
      "starting": ["home"],
      "effects": {
        "tether": {
          "level": 1,
          "anchor": "target"
        }
      },
      "theme": {
        "color": "#00e5ff"
      }
    },
    "tether-l2": {
      "label": "Tether - Level 2",
      "description": "Extends the planet's tether to level 2: the field's range grows from 5120 px to 10240 px around the world. Requires the level-2 tether research and a planet already holding a level-1 tether. Installed in 20 seconds for 200 minerals.",
      "icon": "tether2",
      "category": "planet",
      "targets": ["planet"],
      "cost": {
        "minerals": 200
      },
      "duration": 20,
      "requires": ["exploration/tether_l2"],
      "planetRequires": {
        "tetherLevel": 1
      },
      "repeatable": false,
      "effects": {
        "tether": {
          "level": 2,
          "anchor": "target"
        }
      },
      "theme": {
        "color": "#00e5ff"
      }
    },
    "tether-l3": {
      "label": "Tether - Level 3",
      "description": "Extends the planet's tether to level 3: the field's range grows from 10240 px to 20480 px around the world. Requires the level-3 tether research and a planet already holding a level-2 tether. Installed in 30 seconds for 300 minerals.",
      "icon": "tether3",
      "category": "planet",
      "targets": ["planet"],
      "cost": {
        "minerals": 300
      },
      "duration": 30,
      "requires": ["exploration/tether_l3"],
      "planetRequires": {
        "tetherLevel": 2
      },
      "repeatable": false,
      "effects": {
        "tether": {
          "level": 3,
          "anchor": "target"
        }
      },
      "theme": {
        "color": "#00e5ff"
      }
    },
    "mining-arm-improved": {
      "label": "Improved Mining Arm",
      "description": "A faster mining arm for the ship: it mines asteroids at 1.5 minerals per second (the base arm does 1.0). A ship upgrade — installed from any planet's console, it counts as built wherever the ship lands and is never re-bought.",
      "icon": "mining",
      "category": "mining",
      "targets": ["ship"],
      "cost": {
        "minerals": 200
      },
      "duration": 20,
      "requires": ["mining/improved_arm"],
      "repeatable": false,
      "effects": {
        "mining": {
          "rate": 1.5
        }
      },
      "theme": {
        "color": "#ff8a3d"
      }
    },
    "mining-arm-advanced": {
      "label": "Advanced Mining Arm",
      "description": "The ship's fastest arm: it mines asteroids at 2.0 minerals per second — twice the base arm. Supersedes the Improved Mining Arm (the faster arm always wins). A ship upgrade: built from any planet's console, counted wherever the ship lands.",
      "icon": "mining2",
      "category": "mining",
      "targets": ["ship"],
      "cost": {
        "minerals": 300
      },
      "duration": 20,
      "requires": ["mining/advanced_arm"],
      "repeatable": false,
      "effects": {
        "mining": {
          "rate": 2.0
        }
      },
      "theme": {
        "color": "#ff8a3d"
      }
    },
    "mining-storage-improved": {
      "label": "Improved Mining Storage",
      "description": "Expands the ship's mineral hold to 350 (100 more than the base 250). A ship upgrade: built from any planet's console, counted wherever the ship lands.",
      "icon": "storage",
      "category": "mining",
      "targets": ["ship"],
      "cost": {
        "minerals": 200
      },
      "duration": 20,
      "requires": ["mining/improved_storage"],
      "repeatable": false,
      "effects": {
        "mining": {
          "capacity": 350
        }
      },
      "theme": {
        "color": "#ff8a3d"
      }
    }
  },

  "_template": {
    "_comment": "Shape of one entry in `builds` (the _ keys are documentation, never builds).",
    "label": "string — shown in the list and the detail readout",
    "description": "string — detail readout text",
    "icon": "tether | tether2 | tether3 | anchor | signal | mining | mining2 | storage | diamond — procedural glyph (js/research/ResearchIcons.js)",
    "category": "planet | cargo | mining — which tab of the console (registry above)",
    "targets": ["planet"],
    "_targets": "[\"planet\"] = installed on the planet's surface; [\"ship\"] = a SHIP upgrade (mining arms/storage): built from any planet's console, the effect is ship-wide and it counts as BUILT wherever the ship lands (never re-bought)",
    "cost": {
      "credits": 0,
      "minerals": 200
    },
    "duration": "number — seconds (timeUnit above); 0 = instant",
    "requires": ["exploration/tether_l2"],
    "repeatable": false,
    "starting": ["home"],
    "planetRequires": {
      "tetherLevel": 1
    },
    "effects": {
      "tether": {
        "level": 2,
        "anchor": "target"
      },
      "mining": {
        "rate": 1.5,
        "capacity": 350
      }
    },
    "_effects": "applied on completion, data-driven (GameScene._applyBuildEffects): tether.level = the target world's tether field (anchor target = the built-from planet, home = the home world); mining.rate = the ship's mining speed (minerals/s, MAX wins — never downgrades); mining.capacity = the ship's mineral hold cap (MAX wins)",
    "theme": {
      "color": "#00e5ff"
    }
  }
}