{
  "name": "业余无线电C类题库练习系统",
  "short_name": "无线电C类题库",
  "description": "2025版业余无线电台操作技术能力验证题库（C类）的练习与模拟考试PWA应用。支持顺序练习、随机练习、错题练习和90分钟全真模拟考试。",
  "start_url": "./index.html", // 明确指定启动页面
  "scope": "./", // 定义PWA的作用范围，`./`表示当前目录及子目录
  "display": "standalone", // 完全隐藏浏览器UI，体验最佳
  "display_override": ["window-controls-overlay"], // 实验性特性，让应用控制标题栏区域（Chrome）
  "orientation": "portrait-primary", // 建议锁定竖屏，更适合答题
  "background_color": "#f5f7fa",
  "theme_color": "#1a3a8f",
  "icons": [
    {
      "src": "./icons/icon-72x72.png",
      "sizes": "72x72",
      "type": "image/png"
    },
    {
      "src": "./icons/icon-96x96.png",
      "sizes": "96x96",
      "type": "image/png"
    },
    {
      "src": "./icons/icon-128x128.png",
      "sizes": "128x128",
      "type": "image/png"
    },
    {
      "src": "./icons/icon-144x144.png",
      "sizes": "144x144",
      "type": "image/png"
    },
    {
      "src": "./icons/icon-152x152.png",
      "sizes": "152x152",
     "type": "image/png"
    },
    {
      "src": "./icons/icon-192x192.png",
      "sizes": "192x192",
      "type": "image/png", // Android/Chrome推荐
      "purpose": "any maskable" // `maskable` 适配带圆角的Android图标
    },
    {
      "src": "./icons/icon-384x384.png",
      "sizes": "384x384",
      "type": "image/png"
    },
    {
      "src": "./icons/icon-512x512.png",
      "sizes": "512x512",
      "type": "image/png" // Chrome安装对话框、Windows等推荐
    }
  ],
  "screenshots": [ // 应用商店展示用截图（可选但推荐）
    {
      "src": "./screenshots/mobile-exam.png",
      "sizes": "540x880",
      "type": "image/png",
      "form_factor": "narrow",
      "label": "模拟考试界面"
   },
    {
      "src": "./screenshots/desktop-practice.png",
      "sizes": "835x931",
      "type": "image/png",
      "form_factor": "wide",
      "label": "练习模式界面"
    }
  ]
}