refact: update ui

content/docs/en/faq.md

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+---
+title: FAQ
+description: Frequently asked questions about TexPixel
+slug: faq
+date: 2026-03-25
+tags: [reference]
+order: 3
+---
+
+# Frequently Asked Questions
+
+## General
+
+### Is TexPixel free?
+
+Yes! You can use TexPixel for free with up to 3 uploads per day. No sign-up or credit card is required. For unlimited uploads and additional features, check our Pro plan.
+
+### Do I need to create an account?
+
+No. You can start using TexPixel immediately as a guest. Creating an account (free) lets you sync history across devices.
+
+### What languages are supported?
+
+TexPixel recognizes mathematical formulas regardless of the surrounding language. The user interface is available in English and Chinese.
+
+## Recognition
+
+### How accurate is the recognition?
+
+TexPixel achieves 90-98% accuracy depending on image quality and formula complexity. Clean, high-contrast images of typed formulas typically achieve the highest accuracy.
+
+### Can it recognize handwritten formulas?
+
+Yes. TexPixel handles both printed and handwritten formulas. For best results with handwriting, use dark ink on white paper and keep characters well-spaced.
+
+### What about complex multi-line equations?
+
+TexPixel can recognize multi-line equations, equation arrays, and systems of equations. Each line is captured and formatted correctly in the output.
+
+### Does it support matrices and tables?
+
+Yes. Matrices, determinants, and tabular expressions are supported and output as proper LaTeX `\begin{matrix}` or `\begin{pmatrix}` environments.
+
+## Export & Integration
+
+### Can I use the output in Overleaf?
+
+Absolutely. Copy the LaTeX output and paste it directly into your Overleaf project. It works immediately.
+
+### How do I use the output in Word?
+
+Use the DOCX export option. This creates a Word file with properly formatted equations that you can edit normally in Microsoft Word or Google Docs.
+
+## Privacy & Data
+
+### Are my uploaded images stored?
+
+Uploaded images are processed for recognition and temporarily cached. They are automatically deleted after processing. We do not use your images for training.
+
+### Is my data encrypted?
+
+Yes. All data is transmitted over HTTPS. Uploaded files and results are handled securely.