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SKILL.md

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+---
+name: Office
+description: "掌握Excel、Word、PowerPoint和Google Workspace。"
+---
+
+## What "Office" Means Here
+
+Productivity software: Microsoft 365, Google Workspace, and office administration.
+
+| Signal | Context | Load |
+|--------|---------|------|
+| Formulas, pivot tables, VLOOKUP, macros | Spreadsheets | `tools/spreadsheets.md` |
+| Formatting, headers, mail merge, TOC | Documents | `tools/documents.md` |
+| Slides, animations, presenter view | Presentations | `tools/presentations.md` |
+| Supplies, vendors, facilities, space | Office admin | `admin/facilities.md` |
+
+---
+
+## Spreadsheets (Excel / Google Sheets)
+
+**Formulas people actually need:**
+- `VLOOKUP` / `XLOOKUP` — lookup value in table, return another column
+- `SUMIF` / `COUNTIF` — sum/count with conditions
+- `INDEX/MATCH` — more flexible than VLOOKUP
+- `IF` with `AND`/`OR` — conditional logic
+
+**Common problems:**
+- VLOOKUP returns #N/A → check for spaces, data types, exact match setting
+- Formula works in one cell, breaks when copied → missing `$` for absolute references
+- Dates sorting wrong → format as actual dates, not text
+
+**Pivot tables:** Right-click data → Create Pivot Table → drag fields to rows/columns/values.
+
+---
+
+## Documents (Word / Google Docs)
+
+**Formatting essentials:**
+- Use Styles (Heading 1, 2, 3) for structure — enables automatic TOC
+- Page numbers starting on page 3: Insert break → Different First Page → start numbering
+- Different headers per section: Section breaks, unlink from previous
+
+**Mail Merge:**
+1. Prepare data source (Excel with columns: Name, Address, etc.)
+2. Word → Mailings → Start Mail Merge → Letters
+3. Insert Merge Fields where dynamic content goes
+4. Preview Results → Finish & Merge
+
+---
+
+## Presentations (PowerPoint / Google Slides)
+
+**Professional basics:**
+- Slide Master for consistent styling (View → Slide Master)
+- 6x6 rule: max 6 bullets, 6 words per bullet
+- One idea per slide
+
+**Animations:**
+- Entrance animations for bullet reveal (Appear > Fade > Fly In)
+- Timing: On Click vs After Previous
+- Keep it subtle — animation should aid, not distract
+
+**Presenter View:** F5 to present, use Presenter View to see notes while audience sees slides.
+
+---
+
+## Office Administration
+
+For those managing physical office operations:
+
+**Supplies & Inventory:**
+- Track with simple spreadsheet: Item, Quantity, Reorder Point, Supplier
+- Set calendar reminders for regular orders
+- Bulk ordering usually 15-30% cheaper
+
+**Vendor Management:**
+- Cleaning, maintenance, IT support contracts
+- Document SLAs and contact info in shared location
+- Review contracts annually for renegotiation
+
+**Space Planning:**
+- Hot-desking: Use booking system (even a shared calendar works)
+- Meeting room: Clear naming, visible displays, 15-min buffers
+
+---
+
+## Quick Reference
+
+| Task | Excel/Sheets | Word/Docs | PowerPoint/Slides |
+|------|-------------|-----------|-------------------|
+| Find value | VLOOKUP/XLOOKUP | Find & Replace | Find & Replace |
+| Conditional format | Home → Conditional | N/A | N/A |
+| Auto-update content | Formulas | Fields | Links |
+| Export to PDF | File → Save As | File → Save As | File → Save As |