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Accounts receivable, net - Movement of allowance for doubtful accounts (Details) - CNY (¥)
¥ in Thousands
12 Months Ended
Dec. 31, 2022
Dec. 31, 2021
Dec. 31, 2020
Accounts receivable, net      
Balance at the beginning of the year ¥ 710,168 ¥ 210,146 ¥ 142,256
Provision (Reversal) for the year (82,825) 500,336 67,967
Write-off (70,270) (314) (77)
Balance at the end of the year ¥ 557,073 ¥ 710,168 ¥ 210,146