Predict used-car negotiation margin from ask price, condition and market heat.
Key formulas: max(0.01,min(0.30,suggestedSpace)); max(0.02,min(0.35,baseSpace)); ask×(1-baseSpace×0.5)
二手車談判議價輔助工具,綜合賣家報價、車況、市場熱度、車齡與里程等因素,預測合理成交區間、可議價幅度,並給出不同談判風格下的首次出價與目標價建議。