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Cash flow information - Gross debt reconciliation (Details) - CNY (¥)
¥ in Thousands
 12 Months Ended
Dec. 31, 2024
Dec. 31, 2023
Dec. 31, 2022
Net debt reconciliation      
Net debt at the beginning of the year ¥ 2,449,285 ¥ 2,561,572 ¥ 3,561,300
Cash flows 727,525 (141,004) (1,147,187)
Acquisition of right-of-use assets (58,238) (21,612) (76,534)
Other Changes (i) (707,259) 50,329 223,993
Net debt at the end of the year 2,411,313 2,449,285 2,561,572
Lease liabilities      
Net debt reconciliation      
Net debt at the beginning of the year (51,224) (91,583) (154,890)
Cash flows 36,259 60,922 76,734
Acquisition of right-of-use assets (58,238) (21,612) (76,534)
Other Changes (i) 48,798 1,049 63,107
Net debt at the end of the year (24,405) (51,224) (91,583)
Borrowings      
Net debt reconciliation      
Net debt at the beginning of the year (251,732) (289,062) (815,260)
Cash flows 243,064 49,403 543,501
Other Changes (i) (10,492) (12,073) (17,303)
Net debt at the end of the year (19,160) (251,732) (289,062)
Restricted cash      
Net debt reconciliation      
Net debt at the beginning of the year 447,564 343,814 1,060,427
Cash flows 385,374 77,533 (788,828)
Other Changes (i) (780,998) 26,217 72,215
Net debt at the end of the year 51,940 447,564 343,814
Cash and cash equivalents      
Net debt reconciliation      
Net debt at the beginning of the year 1,379,473 1,907,776 1,399,370
Cash flows 547,155 (543,432) 433,119
Other Changes (i) 21,294 15,129 75,287
Net debt at the end of the year 1,947,922 1,379,473 1,907,776
Financial assets at fair value through profit or loss      
Net debt reconciliation      
Net debt at the beginning of the year 925,204 690,627 2,071,653
Cash flows (484,327) 214,570 (1,411,713)
Other Changes (i) 14,139 20,007 30,687
Net debt at the end of the year ¥ 455,016 ¥ 925,204 ¥ 690,627