{
  "name": "Concrete Calculator",
  "short_name": "ConcreteCalc",
  "description": "Free concrete calculator for slabs, footings, columns, walls, stairs and more.",
  "start_url": "/",
  "display": "standalone",
  "background_color": "#FAF7F2",
  "theme_color": "#2D2926",
  "icons": [
    { "src": "data:image/svg+xml,<svg xmlns='http://www.w3.org/2000/svg' viewBox='0 0 100 100'><text y='.9em' font-size='80'>🏗️</text></svg>", "sizes": "any", "type": "image/svg+xml" }
  ]
}