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Share based compensation - Fair value of options granted that are estimated using binomial model (Details)	12 Months Ended
	Dec. 31, 2024 $ / shares	Dec. 31, 2023 $ / shares	Dec. 31, 2022 $ / shares	Dec. 31, 2024 ¥ / shares	Dec. 31, 2023 ¥ / shares	Dec. 31, 2022 ¥ / shares
PSU
Share based compensation
Expected dividend yield	0.00%
Fair value of underlying ordinary share (4) | (per share)	$ 1.69			¥ 12.25
Expected terms	10 years
Risk-free rate of return	4.26%
Volatility Rate	43.25%
RSU
Share based compensation
Expected terms		10 years	10 years
2021 Option Plan
Share based compensation
Risk-free rate of return, minimum	4.48%	3.79%	1.63%
Risk-free rate of return, maximum	4.69%	3.88%	3.83%
Volatility, minimum	47.09%	44.37%	44.18%
Volatility, maximum	47.34%	44.95%	45.07%
Expected dividend yield	0.00%	0.00%	0.00%
Expected terms	10 years	10 years	10 years
2021 Option Plan | Minimum
Share based compensation
Fair value of underlying ordinary share (4)	$ 1.14	$ 3.16	$ 7.57
2021 Option Plan | Maximum
Share based compensation
Fair value of underlying ordinary share (4)	$ 1.84	$ 8.02	$ 9.30
Share Incentive Plan, 2022
Share based compensation
Expected terms		10 years
Share Incentive Plan, 2022 | RSU
Share based compensation
Risk-free rate of return, minimum		2.65%	1.61%
Risk-free rate of return, maximum		4.25%	4.12%
Volatility, minimum		44.58%	44.15%
Volatility, maximum		44.73%	48.12%
Expected dividend yield	0.00%	0.00%	0.00%
Expected terms	10 years
Risk-free rate of return	4.06%
Volatility Rate	44.56%
Share Incentive Plan, 2022 | Minimum | RSU
Share based compensation
Fair value of underlying ordinary share (4) | (per share)	$ 0.96	$ 3.68	$ 7.57	6.92	¥ 26.46	¥ 48.29
Share Incentive Plan, 2022 | Maximum | RSU
Share based compensation
Fair value of underlying ordinary share (4) | (per share)	$ 1.60	$ 6.91	$ 9.05	¥ 11.52	¥ 49.90	¥ 64.98

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- Definition

The estimated dividend rate (a percentage of the share price) to be paid (expected dividends) to holders of the underlying shares over the option's term.

+ References

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- Definition

The estimated measure of the maximum percentage by which a share price is expected to fluctuate during a period. Volatility also may be defined as a probability-weighted measure of the dispersion of returns about the mean. The volatility of a share price is the standard deviation of the continuously compounded rates of return on the share over a specified period. That is the same as the standard deviation of the differences in the natural logarithms of the stock prices plus dividends, if any, over the period.

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The risk-free interest rate assumption that is used in valuing an option on its own shares.

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The maximum risk-free interest rate assumption that is used in valuing an option on its own shares.

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Price of a single share of a number of saleable stocks of a company.

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Expected term of award under share-based payment arrangement, in 'PnYnMnDTnHnMnS' format, for example, 'P1Y5M13D' represents reported fact of one year, five months, and thirteen days.

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