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Intangible assets, net - Amortization expenses on intangible assets allocated to expense items (Details) - CNY (¥)
¥ in Thousands
 12 Months Ended
Dec. 31, 2024
Dec. 31, 2023
Dec. 31, 2022
Intangible assets, net      
Total depreciation expenses ¥ 91,464 ¥ 31,840 ¥ 24,032
Cost of revenues      
Intangible assets, net      
Total depreciation expenses 48,160 7,985 0
Selling, general and administrative expenses      
Intangible assets, net      
Total depreciation expenses 8,882 10,047 9,987
Research and development expenses      
Intangible assets, net      
Total depreciation expenses ¥ 34,422 ¥ 13,808 ¥ 14,045