{
  "name": "水の硬度計算（軟水・硬水）",
  "short_name": "水の硬度",
  "description": "カルシウムとマグネシウムの濃度から水の総硬度を計算し、軟水・硬水を判定。ドイツ硬度（°dH）も併記。",
  "lang": "ja",
  "dir": "ltr",
  "start_url": "./",
  "scope": "./",
  "display": "standalone",
  "orientation": "portrait",
  "theme_color": "#3b5bdb",
  "background_color": "#f4f6fb",
  "icons": [
    {
      "src": "/icon/water-hardness-192.png",
      "sizes": "192x192",
      "type": "image/png",
      "purpose": "any"
    },
    {
      "src": "/icon/water-hardness-512.png",
      "sizes": "512x512",
      "type": "image/png",
      "purpose": "any"
    },
    {
      "src": "/icon/water-hardness-maskable-512.png",
      "sizes": "512x512",
      "type": "image/png",
      "purpose": "maskable"
    }
  ]
}