## [1.0.0] - 2026-01-12

### Added
- Guided Learning Paths feature for structured learning progression
- Conceptual explanations and diagrams throughout HTML, CSS, and Tailwind lessons
- "Why This Works" concept section with collapsible details/summary elements
- Reset code confirmation dialog with skip option
- CodeMirror 6 editor with Emmet support and syntax highlighting
- Undo/redo/reset editor tools with keyboard shortcuts
- Module progress indicator and cross-module navigation
- Slide-out sidebar layout with lesson modules
- Language switcher supporting English, German, Polish, Spanish, Arabic, and Ukrainian
- Dynamic lesson loading by language with RTL support for Arabic
- Playground module with full-height HTML & CSS editor
- Welcome lesson with Hello World examples in 8 languages and DVD bounce animation
- Gentle loading fallback after 3 seconds
- Live code preview with instant feedback
- Complete German translation of the website
- Toggle switch for disabling error feedback with persistent user settings
- Code caching for instant lesson restoration on page reload
- Help dialog with learning modes and editor tools information
- More Projects section in help resources
- Footer with links to project repository and author website
- JSON schema for course modules
- Fine-grained validation feedback for lessons
- Keyboard shortcuts for editor tools and lesson navigation
- Emmet pro tip in FAQ accordion lesson

### Changed
- Lesson schema to include concept field for explanations
- Module layout from horizontal to Flexbox Froggy style with reordered panels
- Logo design with new branding and clickable navigation
- Preview iframe styling for better isolation and full-height display
- Module pill to float in navigation bar with lesson counter
- Hint bar to float over editor for better space utilization
- Welcome lesson with comprehensive info and learning resources
- Language display to show current language in dropdown format
- Module name element updates instead of overwriting entire pill
- Instruction element order with title first, module pill second
- Task descriptions with improved clarity and friendlier values
- Success message to "CRISPY!" with Japanese smiley emoticon
- Lesson content styling with improved readability and accessibility
- Mobile layout to show editor and preview in optimized order
- CRISPY animation duration and visibility timing
- Hamburger menu with cleaner CSS animation
- Copyright year from 2025 to 2026
- Transitions-animations difficulty level to intermediate
- Meta description and title for HTML & CSS learning focus
- Port configuration to 1234

### Fixed
- Mobile preview-header positioning above preview-wrapper
- Mobile preview visibility with explicit flex display
- Mobile editor minimum height for better usability
- Module list max-height constraint removal
- Placeholder text and loading indicators
- HTML lesson task instructions format alignment with solution code
- Race condition in error feedback closure timing
- Code tags for quoted text in lesson messages
- Preview iframe HTML/body minimum height for full coverage
- Lesson content with improved kbd tags and syntax examples
- Browser form restoration artifact from hidden textarea
- WCAG compliance issues and keyboard accessibility
- Box model task instructions format across all languages
- Hello World lesson with proper HTML structure and paragraph tags
- German translation consistency and completeness
- Initialization bugs affecting level indicator and expected preview
- Validation message casing and clarity
- Module name truncation to mobile only
- Layout issues for RTL text in Arabic
- Logo positioning and animation centering
- Editor scrolling behavior on lesson navigation

### Improved
- Lesson clarity with semantic HTML and proper element usage
- CSS organization with section headers and sorted rules
- Module descriptions for better user understanding
- Validation rules for basic selectors and class selectors lessons
- Progress bar styling with increased height and new background color
- Lesson preview functionality and run button interaction
- Code element styling and accessibility features
- Sidebar transparency for better lesson focus
- Layout performance with synchronous module loading
- Button styling and interactive elements
- Performance with code caching and module loading optimization