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Summary of Significant Accounting Policies - Revenue (Details) - CNY (¥) ¥ in Thousands | 12 Months Ended
--- | ---
Dec. 31, 2025 | Dec. 31, 2024 | Dec. 31, 2023
Summary of Significant Accounting Policies |  |  |
Stand-alone fair value as a percentage of gross selling price | 3.00% |  |
Revenue allocated to performance obligation | ¥ 1,161,603 | ¥ 1,683,234 | ¥ 863,627
Amount charged to selling and marketing expenses | 237,236 | 386,663 | ¥ 162,875
Liabilities related to unredeemed points | 1,958,937 | 2,017,516 |
Vehicle sales |  |  |
Summary of Significant Accounting Policies |  |  |
Contract liabilities | ¥ 6,299,514 | ¥ 6,349,012 |

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