{
    "widgettype": "VBox",
    "options": {
        "cheight": 40,
        "width": "100%",
        "padding": "16px",
        "spacing": "12px"
    },
    "subwidgets": [
        {
            "widgettype": "HBox",
            "options": {
                "width": "100%",
                "justifyContent": "space-between",
                "alignItems": "center"
            },
            "subwidgets": [
                {
                    "widgettype": "VBox",
                    "options": {"spacing": "4px"},
                    "subwidgets": [
                        {"widgettype": "Text", "options": {"text": "文档管理", "cfontsize": 22, "fontWeight": "bold", "color": "#333"}},
                        {"widgettype": "Text", "options": {"text": "上传文本、图片、音频、视频文件", "cfontsize": 14, "color": "#888"}}
                    ]
                },
                {
                    "widgettype": "Button",
                    "options": {
                        "label": "📁 上传文件",
                        "bgcolor": "#50b86c",
                        "color": "#fff"
                    }
                }
            ]
        },
        {
            "widgettype": "VBox",
            "options": {
                "width": "100%",
                "cheight": 8,
                "bgcolor": "#f8f9fa",
                "padding": "24px",
                "css": "card",
                "border": "2px dashed #d0d0d0",
                "alignItems": "center",
                "justifyContent": "center"
            },
            "subwidgets": [
                {"widgettype": "Text", "options": {"text": "📂", "cfontsize": 32}},
                {"widgettype": "Text", "options": {"text": "拖拽文件到此处上传", "cfontsize": 16, "color": "#888"}},
                {"widgettype": "Text", "options": {"text": "支持: TXT, PDF, JPG, PNG, MP3, WAV, MP4, AVI", "cfontsize": 12, "color": "#aaa"}},
                {"widgettype": "Text", "options": {"text": "单个文件最大 500MB · 自动向量化入库", "cfontsize": 12, "color": "#aaa"}}
            ]
        },
        {
            "widgettype": "Text",
            "options": {
                "text": "暂无文档",
                "color": "#aaa",
                "cfontsize": 14,
                "halign": "center"
            }
        }
    ]
}