/**
 * Mobile Accessibility Enhancements
 * Improves screen reader support, focus management, and touch accessibility
 * @author South Shore Behavioral Health Clinic
 */

/* Mobile Accessibility Variables */
:root {
  --mobile-focus-color: #136d6d;
  --mobile-focus-width: 3px;
  --mobile-focus-offset: 2px;
  --mobile-sr-font-size: 1px;
  --mobile-sr-line-height: 1px;
  --mobile-sr-position: absolute;
}

/* Base Mobile Accessibility */
@media (max-width: 768px) {
  /* Screen Reader Only Content */
  .sr-only,
  .screen-reader-only {
    position: var(--mobile-sr-position) !important;
    width: 1px !important;
    height: 1px !important;
    padding: 0 !important;
    margin: -1px !important;
    overflow: hidden !important;
    clip: rect(0, 0, 0, 0) !important;
    white-space: nowrap !important;
    border: 0 !important;
  }

  /* Make content visible when focused (for skip links) */
  .sr-only:focus,
  .screen-reader-only:focus {
    position: static !important;
    width: auto !important;
    height: auto !important;
    padding: inherit !important;
    margin: inherit !important;
    overflow: visible !important;
    clip: auto !important;
    white-space: normal !important;
  }

  /* Enhanced Focus Indicators */
  a:focus,
  button:focus,
  input:focus,
  select:focus,
  textarea:focus,
  [tabindex]:focus {
    outline: var(--mobile-focus-width) solid var(--mobile-focus-color);
    outline-offset: var(--mobile-focus-offset);
    border-radius: 4px;
  }

  /* Remove default focus outline and add custom */
  a:focus-visible,
  button:focus-visible,
  input:focus-visible,
  select:focus-visible,
  textarea:focus-visible,
  [tabindex]:focus-visible {
    outline: var(--mobile-focus-width) solid var(--mobile-focus-color);
    outline-offset: var(--mobile-focus-offset);
  }

  /* Touch-friendly Focus States */
  a:active,
  button:active,
  [role="button"]:active {
    transform: scale(0.98);
    transition: transform 0.1s ease;
  }

  /* High Contrast Mode Support */
  @media (prefers-contrast: high) {
    a:focus,
    button:focus,
    input:focus,
    select:focus,
    textarea:focus {
      outline: 4px solid #000000;
      outline-offset: 3px;
    }
  }

  /* Reduced Motion Support */
  @media (prefers-reduced-motion: reduce) {
    a,
    button,
    input,
    select,
    textarea {
      transition: none !important;
    }

    a:active,
    button:active {
      transform: none !important;
    }
  }
}

/* Mobile Focus Management */
@media (max-width: 768px) {
  /* Focus Trap for Mobile Menu */
  .focus-trap {
    position: relative;
  }

  .focus-trap::before,
  .focus-trap::after {
    content: '';
    position: fixed;
    top: 0;
    width: 1px;
    height: 1px;
    opacity: 0;
    pointer-events: none;
  }

  .focus-trap::before {
    left: 0;
  }

  .focus-trap::after {
    right: 0;
  }

  /* Focus Indicators for Interactive Elements */
  .mobile-interactive {
    position: relative;
  }

  .mobile-interactive:focus {
    z-index: 10;
  }

  /* Touch Target Enhancements */
  .touch-target {
    min-height: 44px;
    min-width: 44px;
    position: relative;
  }

  .touch-target::before {
    content: '';
    position: absolute;
    top: 50%;
    left: 50%;
    transform: translate(-50%, -50%);
    min-height: 44px;
    min-width: 44px;
    z-index: -1;
  }

  /* Accessible Buttons */
  .mobile-button {
    min-height: 44px;
    padding: 12px 16px;
    display: inline-flex;
    align-items: center;
    justify-content: center;
    text-decoration: none;
    border: 1px solid transparent;
    border-radius: 4px;
    font-size: 1rem;
    font-weight: 500;
    transition: all 0.2s ease;
  }

  .mobile-button:focus {
    outline: var(--mobile-focus-width) solid var(--mobile-focus-color);
    outline-offset: var(--mobile-focus-offset);
  }

  /* Accessible Form Elements */
  .mobile-input {
    min-height: 44px;
    padding: 12px;
    border: 2px solid #ccc;
    border-radius: 4px;
    font-size: 16px; /* Prevents zoom on iOS */
    transition: border-color 0.2s ease;
  }

  .mobile-input:focus {
    border-color: var(--mobile-focus-color);
    outline: none;
  }

  /* Accessible Labels */
  .mobile-label {
    display: block;
    margin-bottom: 8px;
    font-weight: 600;
    color: #333;
  }

  /* Error States */
  .mobile-error {
    border-color: #dc3545;
    color: #dc3545;
  }

  .error-message {
    color: #dc3545;
    font-size: 0.875rem;
    margin-top: 4px;
    display: flex;
    align-items: center;
    gap: 4px;
  }

  /* Success States */
  .mobile-success {
    border-color: #28a745;
    color: #28a745;
  }

  .success-message {
    color: #28a745;
    font-size: 0.875rem;
    margin-top: 4px;
    display: flex;
    align-items: center;
    gap: 4px;
  }
}

/* Mobile Screen Reader Improvements */
@media (max-width: 768px) {
  /* Live Regions for Dynamic Content */
  .live-region {
    position: absolute;
    left: -10000px;
    width: 1px;
    height: 1px;
    overflow: hidden;
  }

  /* Polite Live Region */
  .live-region[data-live="polite"] {
    position: var(--mobile-sr-position);
  }

  /* Assertive Live Region */
  .live-region[data-live="assertive"] {
    position: var(--mobile-sr-position);
  }

  /* Status Updates */
  .status-update {
    position: var(--mobile-sr-position);
    width: 1px;
    height: 1px;
    overflow: hidden;
  }

  /* Hidden Content for Screen Readers */
  .sr-context {
    position: var(--mobile-sr-position);
    width: 1px;
    height: 1px;
    overflow: hidden;
  }
}

/* Mobile Navigation Accessibility */
@media (max-width: 768px) {
  /* ARIA Labels for Navigation */
  .mobile-nav-button[aria-expanded="false"] .sr-expanded {
    display: none;
  }

  .mobile-nav-button[aria-expanded="true"] .sr-collapsed {
    display: none;
  }

  /* Focus Management for Mobile Menu */
  .mobile-menu:focus-within {
    outline: var(--mobile-focus-width) solid var(--mobile-focus-color);
    outline-offset: calc(-1 * var(--mobile-focus-width));
  }

  /* Accessible Menu Items */
  .mobile-menu-item {
    position: relative;
  }

  .mobile-menu-item a {
    min-height: 44px;
    display: flex;
    align-items: center;
    padding: 12px 16px;
    text-decoration: none;
    color: inherit;
  }

  .mobile-menu-item a:focus {
    background-color: rgba(19, 109, 109, 0.1);
  }

  /* Submenu Accessibility */
  .mobile-submenu {
    position: relative;
  }

  .mobile-submenu::before {
    content: '';
    position: absolute;
    left: 16px;
    top: 0;
    bottom: 0;
    width: 2px;
    background-color: rgba(255, 255, 255, 0.1);
  }

  .mobile-submenu[aria-hidden="true"] {
    max-height: 0;
    overflow: hidden;
  }

  .mobile-submenu[aria-hidden="false"] {
    max-height: 300px;
  }
}

/* Mobile Form Accessibility */
@media (max-width: 768px) {
  /* Form Groups */
  .form-group {
    margin-bottom: 1.5rem;
  }

  .form-group label {
    display: block;
    margin-bottom: 0.5rem;
    font-weight: 600;
    color: #333;
  }

  /* Required Field Indicators */
  .required-indicator {
    color: #dc3545;
    font-weight: bold;
    margin-left: 2px;
  }

  /* Form Validation */
  .form-input:invalid {
    border-color: #dc3545;
  }

  .form-input:valid {
    border-color: #28a745;
  }

  /* Error Messages */
  .error-container {
    margin-top: 0.5rem;
    padding: 0.5rem;
    background-color: #f8d7da;
    border: 1px solid #f5c6cb;
    border-radius: 4px;
    color: #721c24;
  }

  /* Success Messages */
  .success-container {
    margin-top: 0.5rem;
    padding: 0.5rem;
    background-color: #d4edda;
    border: 1px solid #c3e6cb;
    border-radius: 4px;
    color: #155724;
  }

  /* Help Text */
  .help-text {
    margin-top: 0.5rem;
    font-size: 0.875rem;
    color: #6c757d;
    display: flex;
    align-items: flex-start;
    gap: 4px;
  }

  /* Fieldsets */
  fieldset {
    border: 1px solid #dee2e6;
    border-radius: 4px;
    padding: 1rem;
    margin-bottom: 1rem;
  }

  legend {
    padding: 0 0.5rem;
    font-weight: 600;
    color: #333;
    margin-bottom: 0.5rem;
  }
}

/* Mobile Touch Accessibility */
@media (max-width: 768px) {
  /* Touch-friendly Interactive Elements */
  .touch-interactive {
    min-height: 44px;
    min-width: 44px;
    position: relative;
  }

  .touch-interactive::after {
    content: '';
    position: absolute;
    top: 50%;
    left: 50%;
    transform: translate(-50%, -50%);
    min-height: 44px;
    min-width: 44px;
    z-index: -1;
  }

  /* Gesture Support */
  .gesture-area {
    touch-action: manipulation;
  }

  /* Swipe Indicators */
  .swipe-indicator {
    position: relative;
    overflow: hidden;
  }

  .swipe-indicator::after {
    content: '←→';
    position: absolute;
    top: 50%;
    right: 8px;
    transform: translateY(-50%);
    background: rgba(0, 0, 0, 0.1);
    padding: 4px 8px;
    border-radius: 12px;
    font-size: 0.75rem;
    opacity: 0.7;
  }

  /* Tap Targets */
  .tap-target {
    position: relative;
  }

  .tap-target::before {
    content: '';
    position: absolute;
    top: 50%;
    left: 50%;
    transform: translate(-50%, -50%);
    min-height: 44px;
    min-width: 44px;
    border-radius: 50%;
    background: transparent;
    z-index: -1;
  }
}

/* Mobile Screen Reader Announcements */
@media (max-width: 768px) {
  /* Page Changes */
  .page-change-announcement {
    position: var(--mobile-sr-position);
    width: 1px;
    height: 1px;
    overflow: hidden;
  }

  /* Dynamic Content Changes */
  .content-change-announcement {
    position: var(--mobile-sr-position);
    width: 1px;
    height: 1px;
    overflow: hidden;
  }

  /* Loading States */
  .loading-announcement {
    position: var(--mobile-sr-position);
    width: 1px;
    height: 1px;
    overflow: hidden;
  }

  /* Error States */
  .error-announcement {
    position: var(--mobile-sr-position);
    width: 1px;
    height: 1px;
    overflow: hidden;
  }
}

/* Mobile Keyboard Navigation */
@media (max-width: 768px) {
  /* Keyboard Focus Management */
  .keyboard-navigation a:focus,
  .keyboard-navigation button:focus,
  .keyboard-navigation input:focus {
    outline: 3px solid var(--mobile-focus-color);
    outline-offset: 2px;
    box-shadow: 0 0 0 6px rgba(19, 109, 109, 0.2);
  }

  /* Skip Links */
  .skip-link {
    position: fixed;
    top: -40px;
    left: 50%;
    transform: translateX(-50%);
    background: var(--mobile-focus-color);
    color: white;
    padding: 8px 12px;
    text-decoration: none;
    border-radius: 4px;
    font-weight: 600;
    z-index: 9999;
    transition: top 0.2s ease;
  }

  .skip-link:focus {
    top: 10px;
  }

  /* Focus Restoration */
  .focus-restore {
    transition: transform 0.2s ease;
  }

  .focus-restore:focus {
    transform: scale(1.05);
  }
}

/* Print Styles for Accessibility */
@media print {
  .sr-only,
  .screen-reader-only {
    position: static;
    width: auto;
    height: auto;
    padding: inherit;
    margin: inherit;
    overflow: visible;
    clip: auto;
    white-space: normal;
  }
}