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SEGMENT REPORTING - Geographic information (Details) - CNY (¥)
¥ in Thousands
6 Months Ended
Jun. 30, 2026
Jun. 30, 2025
Geographic information    
Revenue ¥ 345,857 ¥ 199,615
Chinese Mainland    
Geographic information    
Revenue 226,558 152,686
Overseas regions    
Geographic information    
Revenue ¥ 119,299 ¥ 46,929