Implement Comprehensive Accessibility Features for Inclusive Learning

## ♿ Feature Request: Comprehensive Accessibility Features

### Problem Statement
Mandarin Pathways currently lacks comprehensive accessibility features that would make the platform usable for learners with disabilities. Modern language learning platforms should support screen readers, keyboard navigation, visual impairments, hearing impairments, motor disabilities, and learning differences to ensure inclusive education for all users.

### Proposed Features

#### Visual Accessibility
- **Screen Reader Support**
  - Full ARIA (Accessible Rich Internet Applications) implementation
  - Semantic HTML structure with proper heading hierarchy
  - Alt text for all images, icons, and visual content
  - Screen reader announcements for dynamic content updates
  - Audio descriptions for video content and visual learning materials

- **Visual Impairment Support**
  - High contrast mode with customizable color schemes
  - Adjustable font sizes (up to 200% zoom support)
  - Dyslexia-friendly font options (OpenDyslexic, Arial, Verdana)
  - Focus indicators with high-contrast borders
  - Reduced motion options for users with vestibular disorders

- **Low Vision Accommodations**
  - Customizable color themes (dark mode, high contrast, inverted colors)
  - Magnification support without breaking layout
  - Cursor enhancement and tracking features
  - Text-to-speech for all written content
  - Large button and touch target options

#### Auditory Accessibility
- **Hearing Impairment Support**
  - Comprehensive closed captioning for all audio content
  - Visual indicators for audio cues and feedback
  - Vibration patterns for mobile devices (success, error, notification)
  - Sign language interpretation options for video content
  - Text alternatives for audio-based exercises

- **Audio Processing Accommodations**
  - Adjustable playback speed for audio content
  - Visual waveform displays for pronunciation exercises
  - Transcript access for all spoken content
  - Background noise reduction options
  - Selective audio channel control

#### Motor Accessibility
- **Keyboard Navigation**
  - Full keyboard accessibility for all interactive elements
  - Custom keyboard shortcuts for common actions
  - Tab order optimization for logical navigation flow
  - Skip links for main content and navigation areas
  - Sticky focus management during dynamic content updates

- **Alternative Input Methods**
  - Voice command integration for navigation and interaction
  - Eye-tracking compatibility for supported devices
  - Switch control support for assistive devices
  - Large touch targets (minimum 44px) for mobile devices
  - Gesture alternatives for complex interactions

#### Cognitive Accessibility
- **Learning Differences Support**
  - Simplified interface mode with reduced distractions
  - Reading assistance with word highlighting and line guides
  - Memory aids and progress reminders
  - Customizable lesson pacing and break reminders
  - Multi-modal content presentation options

- **Attention and Processing Support**
  - Reduced animation and auto-playing content options
  - Clear, consistent navigation patterns
  - Progress indicators and orientation cues
  - Error prevention and clear error recovery instructions
  - Simplified language options for complex instructions

### Technical Implementation

#### ARIA Implementation
```javascript
// Comprehensive ARIA support for interactive elements
class AccessibilityManager {
  constructor() {
    this.announcer = new LiveRegionAnnouncer();
    this.focusManager = new FocusManager();
    this.keyboardHandler = new KeyboardNavigationHandler();
  }
  
  initializeARIA() {
    // Set up ARIA landmarks
    document.querySelector('main').setAttribute('role', 'main');
    document.querySelector('nav').setAttribute('role', 'navigation');
    document.querySelector('aside').setAttribute('role', 'complementary');
    
    // Initialize live regions for dynamic content
    this.announcer.createLiveRegion('polite');
    this.announcer.createLiveRegion('assertive');
    
    // Set up focus management
    this.focusManager.initialize();
  }
  
  announceToScreenReader(message, priority = 'polite') {
    this.announcer.announce(message, priority);
  }
  
  makeElementAccessible(element, options = {}) {
    // Add ARIA labels and descriptions
    if (options.label) {
      element.setAttribute('aria-label', options.label);
    }
    
    if (options.describedBy) {
      element.setAttribute('aria-describedby', options.describedBy);
    }
    
    // Set appropriate roles
    if (options.role) {
      element.setAttribute('role', options.role);
    }
    
    // Handle interactive states
    if (options.expanded !== undefined) {
      element.setAttribute('aria-expanded', options.expanded);
    }
    
    if (options.disabled) {
      element.setAttribute('aria-disabled', 'true');
    }
    
    return element;
  }
}

class LiveRegionAnnouncer {
  createLiveRegion(politeness = 'polite') {
    const region = document.createElement('div');
    region.setAttribute('aria-live', politeness);
    region.setAttribute('aria-atomic', 'true');
    region.classList.add('sr-only');
    document.body.appendChild(region);
    return region;
  }
  
  announce(message, priority = 'polite') {
    const region = document.querySelector(`[aria-live="${priority}"]`);
    if (region) {
      // Clear and then set message to ensure it's announced
      region.textContent = '';
      setTimeout(() => {
        region.textContent = message;
      }, 100);
    }
  }
}
```

#### Keyboard Navigation System
```javascript
class KeyboardNavigationHandler {
  constructor() {
    this.keyMap = new Map([
      ['ArrowUp', 'navigate-up'],
      ['ArrowDown', 'navigate-down'],
      ['ArrowLeft', 'navigate-left'],
      ['ArrowRight', 'navigate-right'],
      ['Enter', 'activate'],
      ['Space', 'activate'],
      ['Escape', 'close-or-back'],
      ['Tab', 'focus-next'],
      ['F6', 'next-section'],
      ['Alt+1', 'main-content'],
      ['Alt+2', 'lesson-content'],
      ['Alt+3', 'exercises'],
      ['Alt+R', 'repeat-audio'],
      ['Alt+P', 'play-pause-audio'],
      ['Alt+S', 'skip-to-next']
    ]);
    
    this.currentFocusIndex = 0;
    this.focusableElements = [];
  }
  
  initialize() {
    document.addEventListener('keydown', this.handleKeyDown.bind(this));
    this.updateFocusableElements();
    this.setupSkipLinks();
  }
  
  handleKeyDown(event) {
    const action = this.keyMap.get(this.getKeyCombo(event));
    
    if (action) {
      event.preventDefault();
      this.executeAction(action, event);
    }
  }
  
  executeAction(action, event) {
    switch(action) {
      case 'navigate-up':
      case 'navigate-down':
        this.navigateVertically(action === 'navigate-up' ? -1 : 1);
        break;
      case 'navigate-left':
      case 'navigate-right':
        this.navigateHorizontally(action === 'navigate-left' ? -1 : 1);
        break;
      case 'activate':
        this.activateCurrentElement();
        break;
      case 'main-content':
        this.focusElement('#main-content');
        break;
      case 'repeat-audio':
        this.triggerAudioRepeat();
        break;
      default:
        console.log(`Executing keyboard action: ${action}`);
    }
  }
  
  setupSkipLinks() {
    const skipLinks = [
      { href: '#main-content', text: 'Skip to main content' },
      { href: '#lesson-audio', text: 'Skip to lesson audio' },
      { href: '#exercises', text: 'Skip to exercises' },
      { href: '#progress', text: 'Skip to progress section' }
    ];
    
    const skipNav = document.createElement('nav');
    skipNav.className = 'skip-navigation';
    skipNav.setAttribute('aria-label', 'Skip navigation links');
    
    skipLinks.forEach(link => {
      const skipLink = document.createElement('a');
      skipLink.href = link.href;
      skipLink.textContent = link.text;
      skipLink.className = 'skip-link';
      skipNav.appendChild(skipLink);
    });
    
    document.body.insertBefore(skipNav, document.body.firstChild);
  }
}
```

#### Visual Accessibility Features
```javascript
class VisualAccessibilityManager {
  constructor() {
    this.preferences = this.loadPreferences();
    this.themes = {
      default: { /* default color scheme */ },
      highContrast: { /* high contrast colors */ },
      darkMode: { /* dark theme colors */ },
      lowVision: { /* enhanced visibility colors */ }
    };
  }
  
  initializeVisualAccessibility() {
    this.setupThemeControls();
    this.setupFontControls();
    this.setupMotionControls();
    this.applyStoredPreferences();
  }
  
  setupThemeControls() {
    const themeSelector = document.createElement('div');
    themeSelector.className = 'theme-controls';
    themeSelector.innerHTML = `
      <fieldset>
        <legend>Visual Theme</legend>
        <label><input type="radio" name="theme" value="default" checked> Default</label>
        <label><input type="radio" name="theme" value="highContrast"> High Contrast</label>
        <label><input type="radio" name="theme" value="darkMode"> Dark Mode</label>
        <label><input type="radio" name="theme" value="lowVision"> Low Vision</label>
      </fieldset>
    `;
    
    themeSelector.addEventListener('change', (event) => {
      this.applyTheme(event.target.value);
    });
    
    document.querySelector('.accessibility-settings').appendChild(themeSelector);
  }
  
  setupFontControls() {
    const fontControls = document.createElement('div');
    fontControls.className = 'font-controls';
    fontControls.innerHTML = `
      <fieldset>
        <legend>Text Settings</legend>
        <div class="font-size-control">
          <label for="font-size">Font Size: <span id="font-size-value">100%</span></label>
          <input type="range" id="font-size" min="75" max="200" value="100" step="25">
        </div>
        <div class="font-family-control">
          <label for="font-family">Font Family:</label>
          <select id="font-family">
            <option value="default">Default</option>
            <option value="arial">Arial</option>
            <option value="verdana">Verdana</option>
            <option value="opendyslexic">OpenDyslexic</option>
          </select>
        </div>
        <div class="line-spacing-control">
          <label for="line-spacing">Line Spacing:</label>
          <select id="line-spacing">
            <option value="1.2">Normal</option>
            <option value="1.5">Comfortable</option>
            <option value="2.0">Wide</option>
          </select>
        </div>
      </fieldset>
    `;
    
    fontControls.addEventListener('change', (event) => {
      this.applyFontSettings();
    });
    
    document.querySelector('.accessibility-settings').appendChild(fontControls);
  }
  
  applyTheme(themeName) {
    const theme = this.themes[themeName];
    const root = document.documentElement;
    
    Object.entries(theme).forEach(([property, value]) => {
      root.style.setProperty(property, value);
    });
    
    // Update class for theme-specific styles
    document.body.className = document.body.className.replace(/theme-\w+/, '');
    document.body.classList.add(`theme-${themeName}`);
    
    this.savePreference('theme', themeName);
  }
  
  setupMotionControls() {
    const motionControls = document.createElement('div');
    motionControls.innerHTML = `
      <fieldset>
        <legend>Motion and Animation</legend>
        <label>
          <input type="checkbox" id="reduce-motion"> Reduce motion and animations
        </label>
        <label>
          <input type="checkbox" id="pause-autoplay"> Pause auto-playing content
        </label>
      </fieldset>
    `;
    
    document.querySelector('.accessibility-settings').appendChild(motionControls);
  }
}
```

#### Audio Accessibility Features
```javascript
class AudioAccessibilityManager {
  constructor() {
    this.captions = new Map();
    this.audioDescriptions = new Map();
  }
  
  initializeAudioAccessibility() {
    this.setupCaptionControls();
    this.setupAudioControls();
    this.loadCaptionsForAllAudio();
  }
  
  setupCaptionControls() {
    const captionControls = document.createElement('div');
    captionControls.className = 'caption-controls';
    captionControls.innerHTML = `
      <fieldset>
        <legend>Audio Accessibility</legend>
        <label>
          <input type="checkbox" id="show-captions" checked> Show captions
        </label>
        <label for="caption-size">Caption Size:</label>
        <select id="caption-size">
          <option value="small">Small</option>
          <option value="medium" selected>Medium</option>
          <option value="large">Large</option>
        </select>
        <label>
          <input type="checkbox" id="visual-audio-cues"> Visual audio cues
        </label>
      </fieldset>
    `;
    
    document.querySelector('.accessibility-settings').appendChild(captionControls);
  }
  
  addCaptionToAudioElement(audioElement, captionData) {
    const captionContainer = document.createElement('div');
    captionContainer.className = 'audio-captions';
    captionContainer.setAttribute('aria-live', 'polite');
    
    audioElement.parentNode.insertBefore(captionContainer, audioElement.nextSibling);
    
    audioElement.addEventListener('timeupdate', () => {
      this.updateCaptions(audioElement, captionContainer, captionData);
    });
    
    // Add visual indicators for audio events
    audioElement.addEventListener('play', () => {
      this.showVisualIndicator('audio-playing');
    });
    
    audioElement.addEventListener('ended', () => {
      this.showVisualIndicator('audio-ended');
    });
  }
  
  updateCaptions(audioElement, container, captionData) {
    const currentTime = audioElement.currentTime;
    const currentCaption = captionData.find(caption => 
      currentTime >= caption.start && currentTime <= caption.end
    );
    
    if (currentCaption && container.textContent !== currentCaption.text) {
      container.textContent = currentCaption.text;
      container.setAttribute('aria-label', 
        `Current audio: ${currentCaption.text}`);
    }
  }
  
  showVisualIndicator(type) {
    if (document.getElementById('visual-audio-cues').checked) {
      const indicator = document.createElement('div');
      indicator.className = `visual-indicator ${type}`;
      indicator.setAttribute('role', 'status');
      indicator.setAttribute('aria-label', 
        type === 'audio-playing' ? 'Audio started' : 'Audio finished');
      
      document.body.appendChild(indicator);
      
      setTimeout(() => {
        document.body.removeChild(indicator);
      }, 2000);
    }
  }
}
```

### Accessibility Settings Panel
```javascript
const AccessibilitySettings = () => {
  const [settings, setSettings] = useState({
    theme: 'default',
    fontSize: 100,
    fontFamily: 'default',
    reducedMotion: false,
    captions: true,
    visualCues: false,
    keyboardNav: true
  });
  
  const updateSetting = (key, value) => {
    const newSettings = { ...settings, [key]: value };
    setSettings(newSettings);
    localStorage.setItem('accessibility-settings', JSON.stringify(newSettings));
    applyAccessibilitySettings(newSettings);
  };
  
  return (
    <div className="accessibility-settings-panel" role="dialog" aria-labelledby="accessibility-title">
      <h2 id="accessibility-title">Accessibility Settings</h2>
      
      <section aria-labelledby="visual-settings-title">
        <h3 id="visual-settings-title">Visual</h3>
        
        <div className="setting-group">
          <label htmlFor="theme-select">Color Theme:</label>
          <select 
            id="theme-select"
            value={settings.theme} 
            onChange={(e) => updateSetting('theme', e.target.value)}
            aria-describedby="theme-help"
          >
            <option value="default">Default</option>
            <option value="high-contrast">High Contrast</option>
            <option value="dark">Dark Mode</option>
          </select>
          <div id="theme-help" className="help-text">
            Choose a color scheme that works best for you
          </div>
        </div>
        
        <div className="setting-group">
          <label htmlFor="font-size-slider">
            Font Size: {settings.fontSize}%
          </label>
          <input
            type="range"
            id="font-size-slider"
            min="75"
            max="200"
            step="25"
            value={settings.fontSize}
            onChange={(e) => updateSetting('fontSize', e.target.value)}
            aria-describedby="font-size-help"
          />
          <div id="font-size-help" className="help-text">
            Adjust text size for better readability
          </div>
        </div>
      </section>
      
      <section aria-labelledby="audio-settings-title">
        <h3 id="audio-settings-title">Audio & Captions</h3>
        
        <div className="setting-group">
          <label>
            <input
              type="checkbox"
              checked={settings.captions}
              onChange={(e) => updateSetting('captions', e.target.checked)}
            />
            Show captions for audio content
          </label>
        </div>
        
        <div className="setting-group">
          <label>
            <input
              type="checkbox"
              checked={settings.visualCues}
              onChange={(e) => updateSetting('visualCues', e.target.checked)}
            />
            Show visual cues for audio events
          </label>
        </div>
      </section>
    </div>
  );
};
```

### Testing and Compliance

#### Accessibility Testing Suite
- Automated accessibility testing with axe-core
- Manual testing with screen readers (NVDA, JAWS, VoiceOver)
- Keyboard navigation testing across all features
- Color contrast validation (WCAG AA compliance)
- Mobile accessibility testing with assistive technologies

#### WCAG Compliance Checklist
- **Level A**: Basic accessibility requirements
- **Level AA**: Standard accessibility (target compliance level)
- **Level AAA**: Enhanced accessibility for critical features

### Integration with Existing Features

#### Lesson Content Accessibility
- Alt text for all character stroke diagrams
- Audio descriptions for visual grammar explanations
- Keyboard navigation for writing exercises
- Screen reader support for progress indicators

#### Exercise Accessibility
- Alternative input methods for character drawing
- Keyboard shortcuts for audio controls
- Visual and audio feedback for correct/incorrect answers
- Clear instructions and error messages

### Acceptance Criteria
- [ ] Full WCAG 2.1 AA compliance across all pages
- [ ] Complete keyboard navigation functionality
- [ ] Screen reader compatibility (NVDA, JAWS, VoiceOver)
- [ ] High contrast and dark theme options
- [ ] Captions for all audio content
- [ ] Adjustable font sizes and dyslexia-friendly fonts
- [ ] Reduced motion options for animations
- [ ] Visual indicators for audio feedback
- [ ] Accessibility settings panel with persistent preferences
- [ ] Alternative input methods for interactive exercises

### Success Metrics
- Accessibility audit score > 95% (using axe-core or similar tools)
- Zero critical accessibility violations
- Positive feedback from users with disabilities
- Screen reader compatibility across major platforms
- Keyboard navigation completion rate > 90%

### Future Enhancements
- Voice control integration for hands-free operation
- Eye-tracking support for navigation
- Braille display compatibility
- AI-powered audio descriptions
- Sign language integration for video content
- Cognitive load assessment and adaptation

### Priority
High - Accessibility is essential for inclusive education and is often legally required. It significantly expands the potential user base and demonstrates social responsibility.

---
**Labels:** `enhancement`, `frontend`, `accessibility`, `a11y`, `high-priority`

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Uh oh!

Implement Comprehensive Accessibility Features for Inclusive Learning #13

♿ Feature Request: Comprehensive Accessibility Features

Problem Statement

Proposed Features

Visual Accessibility

Auditory Accessibility

Motor Accessibility

Cognitive Accessibility

Technical Implementation

ARIA Implementation

Keyboard Navigation System

Visual Accessibility Features

Audio Accessibility Features

Accessibility Settings Panel

Testing and Compliance

Accessibility Testing Suite

WCAG Compliance Checklist

Integration with Existing Features

Lesson Content Accessibility

Exercise Accessibility

Acceptance Criteria

Success Metrics

Future Enhancements

Priority

Metadata

Assignees

Labels

Projects

Milestone

Relationships

Development

Uh oh!

Implement Comprehensive Accessibility Features for Inclusive Learning #13

Description

♿ Feature Request: Comprehensive Accessibility Features

Problem Statement

Proposed Features

Visual Accessibility

Auditory Accessibility

Motor Accessibility

Cognitive Accessibility

Technical Implementation

ARIA Implementation

Keyboard Navigation System

Visual Accessibility Features

Audio Accessibility Features

Accessibility Settings Panel

Testing and Compliance

Accessibility Testing Suite

WCAG Compliance Checklist

Integration with Existing Features

Lesson Content Accessibility

Exercise Accessibility

Acceptance Criteria

Success Metrics

Future Enhancements

Priority

Metadata

Metadata

Assignees

Labels

Projects

Milestone

Relationships

Development

Issue actions