Added

• Comprehensive Google Analytics Tracking: Enhanced user behavior monitoring across all calculators and tools
• Event Tracking System: Detailed analytics for form interactions, button clicks, and navigation events
• Calculator Analytics: Specific tracking for salary calculator, IMI calculator, NIF validator, and all user interactions
• Navigation Analytics: Complete tracking of header navigation, mobile menu usage, and service card clicks
• Export Analytics: Monitoring of CSV exports and data downloads across all tools
• Error Tracking: Enhanced error monitoring for calculation failures and validation issues
• Sitemap Enhancement: Added missing services (IMI Calculator, Retirement Planner, Social Security) to sitemap.xml

Enhanced Analytics Features

• Form Interaction Tracking: Real-time monitoring of form field changes and user inputs
• Calculator Completion Tracking: Track successful calculations with result values and input parameters
• Navigation Behavior: Monitor user navigation patterns between tools and services
• Button Click Analytics: Comprehensive tracking of all interactive elements
• Mobile Menu Analytics: Track mobile menu usage and hamburger menu interactions
• Validation Analytics: Monitor NIF validation results and error patterns
• Export Behavior: Track when users export calculation results and in what formats

Technical Improvements

• Analytics Utility Framework: Created comprehensive `/src/utils/analytics.ts` with type-safe event tracking
• Event Categorization: Organized analytics into categories (calculator, navigation, form, export, error, validation)
• TypeScript Integration: Full TypeScript support for analytics events with proper type checking
• Performance Optimization: Efficient event tracking that doesn't impact user experience
• Error Handling: Robust error tracking system for debugging and optimization

Integration

• Multi-Calculator Support: Analytics integrated across Salary Calculator, IMI Calculator, NIF Validator
• Homepage Integration: Service card click tracking on main landing page
• Header Navigation: Complete tracking of both desktop and mobile navigation patterns
• Cross-Platform Tracking: Consistent analytics across desktop and mobile experiences

Added

• IMI Calculator: Complete Portuguese Municipal Property Tax (IMI) calculator
• Property Tax Calculations: Comprehensive IMI calculation engine with exemptions and payment schedules
• Municipal Rates Support: Municipal-specific tax rates and additional taxes for major Portuguese municipalities
• Property Valuation Estimator: Built-in property value estimation tool
• Family Exemptions: Support for own residence exemptions and dependent allowances
• Payment Options: Single payment and 3-installment payment schedules with due dates
• CSV Export: Export calculation results and comparisons to CSV format
• Navigation Integration: Added IMI Calculator to main navigation menu
• Home Page Integration: Updated home page with active IMI Calculator card

Technical Improvements

• Type System: Comprehensive TypeScript interfaces for IMI calculations
• UI Components: Enhanced Input component with size variants (sm, md, lg)
• Data Structure: Extended tax formulas JSON with IMI data for 2024-2026
• Calculation Utilities: Advanced calculation functions with validation and error handling
• Municipal Data: Integrated municipal tax rates for major Portuguese cities
• SEO Optimization: Complete metadata and structured data for IMI calculator pages

Fixed

• Hydration Issues: Resolved Next.js hydration warnings in navigation components
• TypeScript Errors: Fixed type conflicts with HTML input element properties
• ESLint Compliance: Resolved linting issues with proper type annotations

Fixed

• Build Process: Resolved TypeScript and ESLint compilation errors
• Code Quality: Fixed unused import warnings in changelog component
• React Hooks: Corrected useEffect dependency issues in Social Security Calculator
• Type Safety: Enhanced TypeScript type definitions in verification utilities
• Import System: Replaced require() imports with proper ES modules for better compatibility

Technical Improvements

• Social Security Calculator: Fixed React Hook dependency warnings with proper useCallback implementation
• Verification System: Added comprehensive TypeScript interfaces for better type safety
• Dynamic Imports: Improved import system for JSON data with proper error handling
• ESLint Compliance: Resolved all linting issues for cleaner code base
• Type Definitions: Enhanced type safety across social security verification utilities

Added

• Portuguese NIF Validator: Comprehensive tax ID number validation tool
• Real-time NIF validation with Portuguese check digit algorithm
• Entity type detection and classification (individuals, companies, organizations)
• Interactive NIF format validation and auto-formatting
• Sample NIF generation for testing purposes
• Visual validation feedback with color-coded states
• Copy to clipboard functionality
• Educational information about Portuguese NIF system

New NIF Validator Features

• Algorithm Validation: Official Portuguese check digit verification
• Entity Recognition: Automatic detection of taxpayer types
• Format Assistance: Real-time formatting as users type (XXX XXX XXX)
• Example Gallery: Clickable examples for different entity types
• Validation States: Clear success/error messaging with explanations
• Mobile Responsive: Portuguese-themed design with excellent UX
• SEO Optimized: Structured data and comprehensive metadata

Technical Improvements

• Enhanced TypeScript support with comprehensive NIF data types
• Robust validation utility functions with strict/flexible modes
• Fake NIF detection for sequential and repeated digit patterns
• Entity categorization system for different business types
• Copy-to-clipboard integration for validated NIFs

Integration

• Added NIF Validator to main navigation (desktop and mobile)
• Updated home page with active NIF Validator card
• Added `/nif-validator` route with full page layout
• Updated sitemap and SEO metadata for better discoverability

Added

• Portuguese Tax Calendar: Comprehensive tax calendar with 15+ financial events
• Interactive calendar with filtering by category and business type
• Visual urgency indicators (overdue, upcoming, importance levels)
• Summary cards showing overdue and upcoming event counts
• Tax Calendar navigation in header and home page integration
• Comprehensive JSON data for Portuguese financial obligations

New Tax Calendar Features

• Event Coverage: IRS, VAT, IRC, Social Security, IMI, IUC, Commercial Registry
• Smart Filtering: Filter by categories, business types, and importance levels
• Business Types: Support for individuals, companies, freelancers, property owners
• Visual Indicators: Color-coded urgency (overdue, 7 days, 30 days, safe)
• Direct Links: Quick access to Portuguese tax portals
• Penalty Information: Important penalty details for late submissions
• Mobile Responsive: Portuguese flag color scheme throughout

Data & Events Included

• IRS: Annual declarations, withholding tax, monthly declarations
• VAT: Monthly and quarterly declarations
• IRC: Corporate tax and Modelo 22 submissions
• Social Security: Monthly contributions and payments
• Property Tax (IMI): Annual payments and installment options
• Vehicle Tax (IUC): Annual circulation tax
• Commercial Registry: Annual accounting document submissions
• EU Trade: Intrastat declarations and customs requirements

Technical Improvements

• Added proper TypeScript support for version imports
• Fixed Turbopack HMR console errors with JSON imports
• Enhanced version generation script for TypeScript modules
• Fixed ESLint issues in privacy policy page
• Added SEO optimization and structured data for tax calendar
• Updated sitemap with tax calendar entry

Integration

• Created new route at `/tax-calendar`
• Added tax calendar components and utilities
• Implemented TypeScript types for calendar events
• Enhanced metadata generation for tax-specific pages
• Updated navigation components across desktop and mobile

Added

• Privacy Policy page with comprehensive privacy information
• Beautiful, human-readable privacy policy design
• Privacy Policy link in footer

Improved

• Privacy policy page with visual sections and icons
• Card-based layout for better readability
• Dark mode support throughout the privacy page
• Interactive elements and visual hierarchy
• Enhanced typography and color scheme

Improved

• Hamburger menu now opens with smooth transitions
• Added 300ms animation duration for menu slide effect
• Enhanced menu item hover states with color transitions
• Replaced display toggle with max-height animation for better UX

Added

• Hamburger menu for mobile navigation
• Responsive mobile menu with slide-down animation
• Mobile-friendly navigation that closes on link click
• Proper ARIA attributes for better accessibility

Fixed

• Navigation now works properly on mobile devices
• Menu responsiveness across all screen sizes

Fixed

• Fixed responsive layout issues on mobile devices
• Improved padding and spacing across all breakpoints
• Made monthly breakdown table mobile-friendly with sticky columns
• Fixed card component overflow on small screens
• Adjusted font sizes for better mobile readability
• Fixed button text truncation on mobile

Fixed

• Fixed social media image formats from SVG to PNG for better compatibility
• Updated OpenGraph and Twitter card images to use PNG format
• Fixed SocialMeta component default image format

Changed

• Updated Twitter card image format from SVG to PNG
• Added Twitter site handle for better attribution
• Improved social media metadata

Changed

• Made years dynamic in all metadata and share components
• Configured site URL to use environment variables
• Updated robots.txt to be dynamically generated
• Improved sitemap generation with dynamic URLs

Fixed

• Fixed hardcoded 2024 references to use current year
• Fixed hardcoded site URLs to use environment configuration

Added

• Automatic version tagging system with git hooks
• GitHub Actions workflow for automatic releases
• Google AdSense integration with ad components
• Version file generation script (`/scripts/generate-version.js`)
• Dynamic version display from JSON configuration
• Social media sharing components
• Open Graph and Twitter card images
• PWA support with manifest.json
• Comprehensive social metadata
• AdSense ad placement components (Banner, InArticle, Sidebar)
• ads.txt file for AdSense verification

Changed

• Enhanced Makefile with version management commands
• Updated build process to include automatic version generation
• Improved Header component to display dynamic version
• Enhanced documentation with AdSense setup guide
• Updated environment files structure for better configuration

Infrastructure

• Automatic version tagging on git push
• Git hooks for pre-push and post-commit actions
• Version tracking in multiple formats (JSON, env files)
• GitHub Actions for automated releases

Documentation

• Added Google AdSense setup guide
• Created social media implementation summary
• Added automatic tagging documentation
• Enhanced troubleshooting sections

Added

• Initial release of Portugal Tools Hub
• Salary Calculator with 2024 tax rates
• Support for IRS withholding calculations
• Social Security contribution calculations
• NHR (Non-Habitual Resident) tax comparison
• Monthly income breakdown
• Employer cost calculations
• Support for various allowances (meal, car)
• Multiple marital status options
• Annual bonus management
• Detailed tax breakdown tables
• Responsive design for mobile and desktop
• Google Analytics integration
• Google Tag Manager support
• Google Ads conversion tracking
• SEO optimizations with metadata
• Sitemap generation
• Structured data (JSON-LD)

Infrastructure

• Environment-based configuration for analytics
• Development and production environment separation
• Version tracking system
• Changelog management

Documentation

• Google services setup guide
• README with project information