使用场景： 场景一：支持拖动顶部工具条/窗口化，避免遮挡界面 <img width="575" height="767" alt="Image" src="https://github.com/user-attachments/assets/a3b3d929-571e-4354-96b5-c46c8c954861" /> 场景二：css var变量 <img width="788" height="158" alt="Image" src="https://github.com/user-attachments/assets/d180601b-90f4-410d-847c-61e09d4fb5fb" />
