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SIGNIFICANT ACCOUNTING POLICIES - Segment reporting (Details) - CNY (¥)
¥ in Thousands
Dec. 31, 2025
Dec. 31, 2024
SIGNIFICANT ACCOUNTING POLICIES    
Total long-lived assets ¥ 1,859,475 ¥ 791,205
PRC    
SIGNIFICANT ACCOUNTING POLICIES    
Total long-lived assets 979,834 591,653
Singapore    
SIGNIFICANT ACCOUNTING POLICIES    
Total long-lived assets 298,268 147,078
Other countries    
SIGNIFICANT ACCOUNTING POLICIES    
Total long-lived assets ¥ 581,373 ¥ 52,474