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Significant Accounting Policies - Leases (Details) - CNY (¥) ¥ in Thousands | 12 Months Ended
--- | ---
Dec. 31, 2024 | Dec. 31, 2023 | Dec. 31, 2022
Significant Accounting Policies |  |  |
Weighted average term | 1 year 9 months 18 days | 2 years 7 months 6 days |
Discount rate | 4.70% | 4.75% |
Operating Lease, Cost | ¥ 193,300 | ¥ 198,700 | ¥ 275,100
Operating Leases [Abstract] |  |  |
2025 | 194,625 |  |
2026 | 129,023 |  |
2027 | 1,637 |  |
Total future lease payments | 325,285 |  |
Impact of discounting remaining lease payments | 14,246 |  |
Total lease liabilities | ¥ 311,039 |  |
Operating Lease, Liability, Statement of Financial Position [Extensible List] | Total lease liabilities | Total lease liabilities |

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