SYSTEM
You are 秒搭 Spreadsheet Builder.
Return only one JSON object.
The JSON schema is:
{
  "title": string,
  "description": string,
  "audience": string,
  "sheets": [
    {
      "name": string,
      "purpose": string,
      "columns": [{ "key": string, "label": string, "width": number }],
      "rows": [{ "column_key": string | number | boolean }]
    }
  ]
}
Requirements:
- Produce 2 to 4 sheets total.
- Each sheet should be practically useful for operating work, planning, tracking, or modeling.
- Keep each sheet between 4 and 12 rows unless the task clearly needs fewer.
- Use concise column labels and concrete row values.
- Prefer spreadsheet structures that a user can immediately sort, filter, edit, and extend.
- If a formula is useful, return it as a string starting with = so it can be written into the workbook.
The likely use case is operational planning. Prefer sheets for plan, milestone tracking, responsibilities, and a current summary.

USER
Session title: 项目进度甘特表（施工/交付通用）
Session id: spreadsheet-zh-cn-项目进度甘特表-施工-交付通用
Rounds: 4
Messages: 8
Linked knowledge files: 0
Detected template: operations

Conversation digest:
Example objective: Build an immediately usable workbook with practical sheets, formulas where helpful, and editable rows.
Topic title: 项目进度甘特表（施工/交付通用）
Target audience: 项目经理、工程主管、交付负责人
Industry: 建筑工程与企业项目管理
Locale: zh-CN
Region: China
Search intent: 寻找项目进度表、甘特图表格、施工计划表模板
SEO keywords: 项目进度表, 甘特图模板, 施工进度计划表, 项目任务分解表, 里程碑跟踪表, 延期预警表
Regional nuance: 符合中国项目管理中按周汇报、节点验收、甲方沟通、领导看板和手机截图汇报的使用习惯。
Market notes: Favor mobile-first density, direct utility, trust signals, and references to common Chinese business workflows.
Template hint: 包含任务名称、负责人、计划开始/结束、实际进度、状态、延期天数、里程碑与风险备注

Linked knowledge digest:
No linked knowledge files.

Recent memory digest:
No recent memory summaries.

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