The percentage of annual increase in shares based on the then issued and outstanding shares.

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Number of shares under options adjusted for performance conditions.

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No definition available.

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Amount of difference between fair value of the underlying shares reserved for issuance and exercise price of vested portions of options adjusted for performance conditions.

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No definition available.

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Per share or per unit share based compensation arrangement by share based payment award options adjusted for performance conditions weighted average grant date fair value.

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Amount of difference between fair value of the underlying shares reserved for issuance and exercise price of vested portions of options outstanding and currently converted.

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No definition available.

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Number of share options (or share units) converted during the current period.

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No definition available.

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Gross number of share options (or share units) converted during the period.

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Per share or per unit share based compensation arrangement by share based payment award options converted weighted average grant date fair value.

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Weighted average remaining contractual term for option awards converted, in 'PnYnMnDTnHnMnS' format, for example, 'P1Y5M13D' represents the reported fact of one year, five months, and thirteen days.

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No definition available.

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Per share or per unit share based compensation arrangement by share based payment award options exercisable weighted average grant date fair value.

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Amount of difference between fair value of the underlying shares reserved for issuance and exercise price of vested portions of options exercised.

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Per share or per unit share based compensation arrangement by share based payment award options exercised weighted average grant date fair value.

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Weighted average remaining contractual term for option awards exercised, in 'PnYnMnDTnHnMnS' format, for example, 'P1Y5M13D' represents the reported fact of one year, five months, and thirteen days.

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Weighted average remaining contractual term for option awards granted, in 'PnYnMnDTnHnMnS' format, for example, 'P1Y5M13D' represents the reported fact of one year, five months, and thirteen days.

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Amount of difference between fair value of the underlying shares reserved for issuance and exercise price of vested portions of options outstanding and currently granted.

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Per share or per unit share based compensation arrangement by share based payment award options outstanding weighted average grant date fair value.

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Per share or per unit share based compensation arrangement by share based payment award options vested or expected to be vested weighted average grant date fair value.

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Weighted average per share amount at which grantees can acquire shares of common stock by converting of options.

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Weighted average per share amount of options adjusted for performance conditions.

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Weighted average per share amount at which converts can acquire shares of common stock by exercise of options.

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Amount of expense for award under share-based payment arrangement. Excludes amount capitalized.

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Weighted-average period over which cost not yet recognized is expected to be recognized for 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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Amount of cost to be recognized for option under share-based payment arrangement.

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Period over which grantee's right to exercise award under share-based payment arrangement is no longer contingent on satisfaction of service or performance condition, in 'PnYnMnDTnHnMnS' format, for example, 'P1Y5M13D' represents reported fact of one year, five months, and thirteen days. Includes, but is not limited to, combination of market, performance or service condition.

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Agreed-upon price for the exchange of the underlying asset relating to the share-based payment award.

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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.

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The estimated measure of the 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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Line items represent financial concepts included in a table. These concepts are used to disclose reportable information associated with domain members defined in one or many axes to the table.

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Number of shares authorized for issuance under share-based payment arrangement.

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The number of shares into which fully or partially vested stock options outstanding as of the balance sheet date can be currently converted under the option plan.

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The weighted-average price as of the balance sheet date at which grantees can acquire the shares reserved for issuance on vested portions of options outstanding and currently exercisable under the stock option plan.

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Amount of accumulated difference between fair value of underlying shares on dates of exercise and exercise price on options exercised (or share units converted) into shares.

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Weighted average price at which grantees can acquire the shares reserved for issuance under the stock option plan.

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Amount by which current fair value of underlying stock exceeds exercise price of fully vested and expected to vest options outstanding. Includes, but is not limited to, unvested options for which requisite service period has not been rendered but that are expected to vest based on achievement of performance condition, if forfeitures are recognized when they occur.

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SHARE-BASED COMPENSATION - Stock options activity (Details) ¥ / shares in Units, ¥ in Thousands	1 Months Ended						12 Months Ended
	May 31, 2025 $ / shares shares	May 31, 2025 ¥ / shares shares	Feb. 28, 2023 $ / shares shares	Feb. 28, 2023 ¥ / shares shares	Aug. 31, 2020 shares	May 31, 2018 shares	Dec. 31, 2025 $ / shares	Dec. 31, 2025 CNY (¥) ¥ / shares shares	Dec. 31, 2024 CNY (¥) ¥ / shares shares	Dec. 31, 2023 CNY (¥)	Dec. 31, 2025 CNY (¥) ¥ / shares shares	Dec. 31, 2023 $ / shares
Share-based compensation arrangement by share-based payment award
Number of shares granted \| shares	1,079,134	1,079,134	47,300	47,300				1,079,134
Exercise price per share \| $ / shares	$ 0.00001		$ 0.00001				$ 0.00001
Vesting period (in years)	3 years	3 years
Weighted-average grant date fair value per option \| ¥ / shares		¥ 152.48		¥ 54.93				¥ 152.48
Number of options converted from restricted shares \| shares	3,906,464	3,906,464
Weighted average exercise price for options converted \| $ / shares	$ 0.00001
Fair value assumptions
Exercise price \| $ / shares							0.00001					$ 0.00001
Number of options
Options outstanding at beginning \| shares								1,635,250
Options granted in 2025 \| shares	1,079,134	1,079,134	47,300	47,300				1,079,134
Options converted in 2025 \| shares								3,906,464
Options exercised in 2025 \| shares								(1,008,084)
Options adjusted for performance conditions in 2025 \| shares								(196,580)
Options outstanding at ending \| shares								5,416,184	1,635,250
Options exercisable at December 31, 2025 \| shares											2,161,753
Options vested or expected to be vested at December 31, 2025 \| shares											5,416,184
Weighted Average Exercise Price
Options outstanding at beginning \| $ / shares							0.00001
Options granted in 2025 \| $ / shares	$ 0.00001		$ 0.00001				0.00001
Options converted in 2025 \| $ / shares							0.00001
Options exercised in 2025 \| $ / shares							0.00001
Options adjusted for performance conditions in 2025 \| $ / shares							0.00001
Options outstanding at ending \| $ / shares							0.00001
Options exercisable at December 31, 2025 \| $ / shares							0.00001
Options vested or expected to be vested at December 31, 2025 \| $ / shares							$ 0.00001
Weighted Average Remaining Contract Life Years
Options granted in 2025								9 years 4 months 20 days
Options converted in 2025								8 years 10 months 20 days
Options exercised in 2025								6 years 6 months 25 days
Options outstanding at ending								7 years 8 months 8 days	4 years 2 months 19 days
Options exercisable at December 31, 2025								5 years 8 months 12 days
Options vested or expected to be vested at December 31, 2025								7 years 8 months 8 days
Aggregate Intrinsic Value
Options outstanding at beginning								¥ 229,049
Options granted in 2025											¥ 72,712
Options converted in 2025											263,218
Options exercised in 2025								(67,925)
Options adjusted for performance conditions in 2025											(13,246)
Options outstanding at ending								364,942	¥ 229,049
Options exercisable at December 31, 2025											145,659
Options vested or expected to be vested at December 31, 2025											¥ 364,942
Share-based compensation expense								¥ 378,374	¥ 167,613	¥ 185,604
Weighted Average Grant-date Fair value
Options outstanding at beginning \| ¥ / shares								¥ 49.78
Options granted in 2025 \| ¥ / shares		¥ 152.48		¥ 54.93				152.48
Options converted in 2025 \| ¥ / shares											¥ 109.75
Options exercised in 2025 \| ¥ / shares											77.6
Options adjusted for performance conditions in 2025 \| ¥ / shares											152.64
Options outstanding at ending \| ¥ / shares								¥ 104.58	¥ 49.78
Options exercisable at December 31, 2023 \| ¥ / shares											80.42
Options vested or expected to be vested at December 31, 2023 \| ¥ / shares											¥ 104.58
Fair Value of Options without Market Conditions Considered
Fair value assumptions
Risk-free rate of interest								4.22%		4.13%
Estimated volatility rate								56.00%		76.20%
Dividend yield								4.17%		4.70%
Expected life (years)								5 years 6 months		5 years 9 months 10 days
Fair Value of Options with Market Conditions Considered
Fair value assumptions
Risk-free rate of interest								4.24%
Estimated volatility rate								55.30%
Employee Stock Option
Share-based compensation arrangement by share-based payment award
Vesting period (in years)			3 years	3 years
Aggregate Intrinsic Value
Share-based compensation expense								¥ 212,593	¥ 78,531	¥ 123,981
Fair value of the restricted shares vested								127,860	563,119	157,879
Aggregate intrinsic value of options exercised								¥ 67,925	¥ 860,708	¥ 124,114
Employee Stock Option \| Employees
Aggregate Intrinsic Value
Unrecognized compensation cost											¥ 184,673
Weighted-average period								9 months 25 days
2018 plan \| Employee Stock Option
Share-based compensation arrangement by share-based payment award
Number of shares available for grant \| shares						25,336,096
Expiry period (in years)						10 years
2019 Plan \| Employee Stock Option
Share-based compensation arrangement by share-based payment award
Number of shares available for grant \| shares					17,547,567
Expiry period (in years)					10 years
Percentage of annual increase in shares					1.00%