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Mezzanine equity - Activities of the Redeemable Convertible Preferred Shares (Details) ¥ in Thousands, $ in Thousands |  | 1 Months Ended | 12 Months Ended
--- | --- | --- | ---
Jan. 16, 2020 shares | Jul. 31, 2021 shares | Dec. 31, 2023 CNY (¥) shares | Dec. 31, 2021 CNY (¥) shares | Dec. 31, 2021 USD ($) shares
Increase (Decrease) in Temporary Equity [Roll Forward] |  |  |  |  |
Balance as of beginning, Total |  |  |  | ¥ 232,475 |
Issuance of preferred shares |  |  |  | 3,002,374 |
Issuance cost |  |  |  | (10,000) |
Re-designation of ordinary shares into Series A Preferred Shares |  |  |  | 97,660 |
Subscription contributions from shareholders |  |  | ¥ 159,485 | 1,032,104 |
Conversion of Preferred Shares to Ordinary Shares upon the completion of the IPO |  |  | (5,492,749) |  |
Accretion of Redeemable Convertible Preferred Shares |  |  | 354,878 | 243,564 |
Foreign currency translation adjustment |  |  | ¥ 445,479 | (65,270) |
Balance as of ending, Total |  |  |  | ¥ 4,532,907 |
Series Angel Preferred Shares |  |  |  |  |
Increase (Decrease) in Temporary Equity [Roll Forward] |  |  |  |  |
Balance as of beginning (in shares) | shares |  |  |  | 0 | 0
Issuance of preferred shares (in shares) | shares |  |  |  | 6,016,207 | 6,016,207
Issuance of preferred shares |  |  |  | ¥ 273,519 |
Conversion of Preferred Shares to Ordinary Shares upon the completion of the IPO (in shares) | shares |  |  | (6,016,207) |  |
Conversion of Preferred Shares to Ordinary Shares upon the completion of the IPO |  |  | ¥ (332,450) |  |
Accretion of Redeemable Convertible Preferred Shares |  |  | 21,916 | 13,655 |
Foreign currency translation adjustment |  |  | ¥ 26,949 | ¥ (3,589) |
Balance as of ending (in shares) | shares |  |  |  | 6,016,207 | 6,016,207
Balance as of ending, Carrying amount |  |  |  | ¥ 283,585 |
Series Angel Preferred Shares | Carrying amount |  |  |  |  |
Increase (Decrease) in Temporary Equity [Roll Forward] |  |  |  |  |
Balance as of beginning, Carrying amount |  |  |  | ¥ 0 |
Series A Preferred Shares |  |  |  |  |
Increase (Decrease) in Temporary Equity [Roll Forward] |  |  |  |  |
Balance as of beginning (in shares) | shares |  |  |  | 26,841,535 | 26,841,535
Issuance of preferred shares (in shares) | shares | 26,841,535 |  |  |  |
Re-designation of ordinary shares into Series A Preferred Shares (in shares) | shares |  |  |  | 2,343,309,000 | 2,343,309,000
Conversion of Preferred Shares to Ordinary Shares upon the completion of the IPO (in shares) | shares |  |  | (29,184,844) |  |
Balance as of ending (in shares) | shares |  |  |  | 29,184,844 | 29,184,844
Series A Preferred Shares | Subscription receivable |  |  |  |  |
Increase (Decrease) in Temporary Equity [Roll Forward] |  |  |  |  |
Balance as of beginning, Subscription receivable |  |  |  | ¥ (1,032,104) |
Subscription contributions from shareholders |  |  |  | 1,032,104 |
Balance as of ending, Subscription receivable |  |  |  | 0 |
Series A Preferred Shares | Carrying amount |  |  |  |  |
Increase (Decrease) in Temporary Equity [Roll Forward] |  |  |  |  |
Balance as of beginning, Carrying amount |  |  |  | 1,264,579 |
Re-designation of ordinary shares into Series A Preferred Shares |  |  |  | 97,660 |
Conversion of Preferred Shares to Ordinary Shares upon the completion of the IPO |  |  | ¥ (1,665,606) |  |
Accretion of Redeemable Convertible Preferred Shares |  |  | 100,884 | 99,161 |
Foreign currency translation adjustment |  |  | ¥ 135,409 | (32,087) |
Balance as of ending, Carrying amount |  |  |  | ¥ 1,429,313 |
Series A+ Preferred Shares |  |  |  |  |
Increase (Decrease) in Temporary Equity [Roll Forward] |  |  |  |  |
Balance as of beginning (in shares) | shares |  |  |  | 0 | 0
Balance as of beginning, Carrying amount |  |  |  | ¥ 0 |
Issuance of preferred shares (in shares) | shares |  |  |  | 29,361,157 | 29,361,157
Issuance of preferred shares |  |  |  | ¥ 1,331,641 |
Issuance cost |  |  |  | (10,000) |
Conversion of Preferred Shares to Ordinary Shares upon the completion of the IPO (in shares) | shares |  |  | (29,361,157) |  |
Conversion of Preferred Shares to Ordinary Shares upon the completion of the IPO |  |  | ¥ (1,625,397) |  |
Accretion of Redeemable Convertible Preferred Shares |  |  | 106,959 | 79,336 |
Foreign currency translation adjustment |  |  | ¥ 131,767 | ¥ (14,306) |
Balance as of ending (in shares) | shares |  |  |  | 29,361,157 | 29,361,157
Balance as of ending, Carrying amount |  |  |  | ¥ 1,386,671 |
Series A++ Preferred Shares |  |  |  |  |
Increase (Decrease) in Temporary Equity [Roll Forward] |  |  |  |  |
Balance as of beginning (in shares) | shares |  |  |  | 0 | 0
Balance as of beginning, Carrying amount |  |  |  | ¥ 0 |
Issuance of preferred shares (in shares) | shares |  |  |  | 8,546,916 | 8,546,916
Issuance of preferred shares |  |  |  | ¥ 452,241 |
Conversion of Preferred Shares to Ordinary Shares upon the completion of the IPO (in shares) | shares |  |  | (8,546,916) |  |
Conversion of Preferred Shares to Ordinary Shares upon the completion of the IPO |  |  | ¥ (557,324) |  |
Accretion of Redeemable Convertible Preferred Shares |  |  | 36,732 | 23,005 |
Foreign currency translation adjustment |  |  | ¥ 45,179 | ¥ 167 |
Balance as of ending (in shares) | shares |  |  |  | 8,546,916 | 8,546,916
Balance as of ending, Carrying amount |  |  |  | ¥ 475,413 |
Series B Preferred Shares |  |  |  |  |
Increase (Decrease) in Temporary Equity [Roll Forward] |  |  |  |  |
Balance as of beginning (in shares) | shares |  |  |  | 0 | 0
Issuance of preferred shares (in shares) | shares |  | 9,882,082 |  | 17,615,165 | 17,615,165
Conversion of Preferred Shares to Ordinary Shares upon the completion of the IPO (in shares) | shares |  |  | (17,615,165) |  |
Balance as of ending (in shares) | shares |  |  |  | 17,615,165 | 17,615,165
Balance as of ending, Subscription receivable |  |  |  | ¥ (159,392) | $ (25,000)
Series B Preferred Shares | Subscription receivable |  |  |  |  |
Increase (Decrease) in Temporary Equity [Roll Forward] |  |  |  |  |
Balance as of beginning, Subscription receivable |  |  |  | 0 |
Issuance of preferred shares |  |  |  | (159,215) |
Subscription contributions from shareholders |  |  | ¥ 159,485 |  |
Foreign currency translation adjustment |  |  | (93) | (177) |
Balance as of ending, Subscription receivable |  |  |  | (159,392) |
Series B Preferred Shares | Carrying amount |  |  |  |  |
Increase (Decrease) in Temporary Equity [Roll Forward] |  |  |  |  |
Balance as of beginning, Carrying amount |  |  |  | 0 |
Issuance of preferred shares |  |  |  | 1,104,188 |
Conversion of Preferred Shares to Ordinary Shares upon the completion of the IPO |  |  | (1,311,972) |  |
Accretion of Redeemable Convertible Preferred Shares |  |  | 88,387 | 28,407 |
Foreign currency translation adjustment |  |  | ¥ 106,268 | (15,278) |
Balance as of ending, Carrying amount |  |  |  | ¥ 1,117,317 |

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