# WorkClock - Salary Calculator

## Project Overview
WorkClock is a free online salary calculator designed for office workers. It helps track earnings in real-time, calculate salary per second/minute/hour/day/month/year, and provides work countdown timers.

## Core Features
- Real-time salary calculation with live earnings display
- Work countdown timer (countdown to work/off)
- Monthly calendar view with work day indicators
- Chinese statutory holidays support
- Multi-language support (English, Chinese)
- Data export (CSV, Excel)
- Settings import/export
- Dark mode and light mode
- PWA support for offline use
- Responsive design for mobile and desktop

## Pages
- index.html: Main salary calculator page
- about.html: About WorkClock
- privacy.html: Privacy Policy
- terms.html: Terms of Service
- contact.html: Contact Information

## Technical Stack
- HTML5, CSS3, JavaScript (Vanilla JS)
- No frameworks or build tools required
- LocalStorage for data persistence
- Google AdSense for monetization
- PWA with Service Worker

## Key Files
- js/i18n.js: Multi-language system
- js/holidays.js: Chinese statutory holidays data
- js/salary.js: Salary calculation engine
- js/export.js: Data export functionality
- js/chart.js: Chart rendering
- js/app.js: Main application logic
- css/style.css: All styles with dark mode support

## Usage
1. Open index.html in a browser
2. Click settings to configure monthly salary
3. Set work times and entry date
4. View real-time earnings and countdown
5. Export data as needed

## Privacy
All data is stored locally in browser localStorage. No personal information is collected or sent to servers.

## Monetization
The project uses Google AdSense for revenue. Ad slots are positioned at:
- Top banner
- Left sidebar
- Right sidebar
- Bottom banner

## PWA Features
- Can be installed on desktop and mobile
- Works offline
- Has app icon and manifest

## Browser Compatibility
- Chrome 90+
- Firefox 88+
- Safari 14+
- Edge 90+