feat: optimize docs pages and add 4 new doc articles (en + zh)

- Rewrote DocsListPage and DocDetailPage with landing.css aesthetic
  (icon cards, skeleton loader, prose styles, CTA box)
- Added docs-specific CSS to landing.css
- Created image-to-latex, copy-to-word, ocr-accuracy, pdf-extraction
  articles in both English and Chinese
- Updated DocsSeoSection guide cards to link to real doc slugs

Co-Authored-By: Claude Sonnet 4.6 <noreply@anthropic.com>

content/docs/en/copy-to-word.md

@@ -0,0 +1,66 @@
+---
+title: Copy to Word
+description: Export recognized formulas directly into Microsoft Word as editable equations
+slug: copy-to-word
+date: 2026-03-25
+tags: [export, Word, DOCX]
+order: 4
+---
+
+# Copy to Word
+
+TexPixel can export your recognized formulas directly into Microsoft Word as native, editable equations — not images. This means you can continue editing the formula inside Word after export.
+
+## How to Export to Word
+
+1. Upload your formula image and wait for recognition to complete.
+2. Click the **Export** button in the result panel.
+3. Select **DOCX** from the file export options.
+4. Download the file and open it in Microsoft Word.
+
+The downloaded `.docx` file contains your formula as a native Word equation (OMML format), which Word renders using its built-in equation editor.
+
+## Why Use DOCX Export?
+
+| Method | Editable in Word | Renders Correctly | Copy-Paste |
+|---|---|---|---|
+| Screenshot / image | No | Yes | No |
+| LaTeX string | No (without plugin) | No | Yes |
+| DOCX export | **Yes** | **Yes** | N/A |
+
+The DOCX format is ideal when you need to:
+- Submit homework or reports as Word documents
+- Share formulas with colleagues who don't use LaTeX
+- Continue editing the formula after export
+
+## Inserting into an Existing Document
+
+If you want to insert a formula into an existing Word document rather than starting fresh:
+
+1. Open the downloaded `.docx` file in Word.
+2. Select the equation and copy it (`Ctrl+C` / `Cmd+C`).
+3. Paste it into your target document (`Ctrl+V` / `Cmd+V`).
+
+Word preserves the equation formatting during paste.
+
+## Mixed Content (Text + Formulas)
+
+If your upload contains a mix of regular text and formulas (e.g., a textbook page), use DOCX export — it's the only format that handles mixed content correctly. LaTeX and MathML export are only available for pure-formula results.
+
+> **Note:** For mixed-content results, LaTeX/MathML export is disabled. Use DOCX to get a properly formatted document with both text and equations.
+
+## Compatibility
+
+DOCX export is compatible with:
+- Microsoft Word 2016 and later (Windows and Mac)
+- Google Docs (equations render as images when imported)
+- LibreOffice Writer (partial support)
+
+## Tips
+
+- After pasting into Word, double-click the equation to open the equation editor and make changes.
+- If the formula looks different from expected, try re-uploading a higher-resolution image for a more accurate recognition result.
+
+---
+
+[Try exporting a formula to Word →](/app)