ns = params_kw.copy()
kb_id = ns.get('kb_id', '')

body = """{
    "widgettype": "VBox",
    "options": {"width": "100%", "padding": "0", "spacing": "16px"},
    "subwidgets": [
        {"widgettype": "Text", "options": {"text": "📤 上传文件", "cfontsize": 20, "fontWeight": "bold", "color": "#333"}},
        {
            "widgettype": "VBox",
            "options": {
                "id": "drop_zone", "width": "100%", "cheight": 12,
                "bgcolor": "#f8f9fa", "padding": "32px", "css": "card",
                "border": "2px dashed #3b82f6",
                "alignItems": "center", "justifyContent": "center"
            },
            "subwidgets": [
                {"widgettype": "Text", "options": {"text": "📂", "cfontsize": 40}},
                {"widgettype": "Text", "options": {"text": "点击选择文件上传", "cfontsize": 16, "color": "#555"}},
                {"widgettype": "Text", "options": {"text": "支持: TXT, PDF, JPG, PNG, MP3, WAV, MP4", "cfontsize": 12, "color": "#999"}}
            ]
        }
    ]
}"""
import json
return json.loads(body)