{
  "widgettype": "VBox",
  "options": {
    "maxWidth": "400px",
    "margin": "100px auto",
    "padding": "30px",
    "border": "1px solid #ddd",
    "borderRadius": "8px",
    "backgroundColor": "#fff"
  },
  "subwidgets": [
    {
      "widgettype": "Text",
      "options": {
        "text": "集成CRM管理系统",
        "fontSize": "24px",
        "fontWeight": "bold",
        "textAlign": "center",
        "marginBottom": "30px"
      }
    },
    {
      "widgettype": "Form",
      "options": {
        "fields": [
          {
            "name": "username",
            "label": "用户名",
            "type": "text",
            "required": true
          },
          {
            "name": "password", 
            "label": "密码",
            "type": "password",
            "required": true
          }
        ],
        "onSubmit": "login_user"
      }
    }
  ]
}