{
  "name": "カード番号チェック（Luhnアルゴリズム）",
  "short_name": "Luhnチェック",
  "description": "番号をLuhn（モジュラス10）で書式チェックし、桁数とプレフィックスからカードブランドを推定。実在判定はしない学習・テスト用。",
  "lang": "ja",
  "dir": "ltr",
  "start_url": "./",
  "scope": "./",
  "display": "standalone",
  "orientation": "portrait",
  "theme_color": "#3b5bdb",
  "background_color": "#f4f6fb",
  "icons": [
    {
      "src": "/icon/luhn-check-192.png",
      "sizes": "192x192",
      "type": "image/png",
      "purpose": "any"
    },
    {
      "src": "/icon/luhn-check-512.png",
      "sizes": "512x512",
      "type": "image/png",
      "purpose": "any"
    },
    {
      "src": "/icon/luhn-check-maskable-512.png",
      "sizes": "512x512",
      "type": "image/png",
      "purpose": "maskable"
    }
  ]
}