📋 Cover Letter Input

Cover Letter Input is a personal Chrome extension that overlays any file input field with a beautifully styled, glassmorphic interface for writing and downloading custom cover letters as PDFs — all without leaving the page.

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✨ Features

• 🔍 Shadow DOM Injection: Seamlessly embeds a secure overlay without interfering with host page styles or scripts.
• 📄 Live PDF Export: Instantly generate a downloadable cover letter PDF using jsPDF.
• 📂 Overlay on File Inputs: Detects input[type="file"] elements dynamically across standard DOM, Shadow DOMs, and even iframes.
• 💅 Slick UI: Glassmorphic design with animated gradient text, shimmering transitions, and responsive layout.
• 📎 File Upload: Easily import an existing cover letter from your computer.

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🚀 How It Works

1. Detects File Inputs
   Hooks into .click() and .showPicker() calls and listens for new elements via MutationObserver.

2. Injects Overlay
   On trigger, a Shadow DOM host is created and overlay.html, overlay.js, and init.js are injected to build the UI.

3. Generates PDF
   Uses window.jspdf.jsPDF to render styled text with margins, line wrapping, and auto-pagination.

4. Exports/Closes
   Users can export their work or close the overlay — all without affecting the underlying input.

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🛠 Tech Stack

• Manifest v3 (Chrome Extensions)
• JavaScript, HTML, CSS
• jsPDF for PDF generation
• Shadow DOM + DOM traversal logic
• MutationObserver for dynamic input detection

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📈 Metrics & Highlights

• Injects overlay in ≤200ms in most DOM environments.
• Supports all URL matches via <all_urls>, running in every frame.
• Uses isolated world for safe script injection (content.js, init.js, overlay.js).
• Written with idempotent logic to avoid event duplication or memory leaks.

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📦 Installation

1. Clone this repo

2. Go to chrome://extensions/ and enable Developer Mode.

3. Click Load unpacked and select the cloned directory.

4. Navigate to any page with a file input and try clicking it!

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🧪 Development Notes

• Handles shadow roots and iframes gracefully.
• Designed for extensibility (e.g. AI cover letter generation).
• Animations are GPU-accelerated for better performance.

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📜 License

MIT License — built with ❤️ by Shervin Farahani

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🤝 Contributing

This is a personal project, but PRs are welcome! Feel free to fork and adapt.