/**
 * Responsive Design & Accessibility Enhancements
 * Comprehensive mobile-first design and accessibility features
 */

/* ===================================================================
   RESPONSIVE DESIGN SYSTEM
   ================================================================== */

/* Mobile-first breakpoint system */
:root {
  --breakpoint-xs: 320px;
  --breakpoint-sm: 576px;
  --breakpoint-md: 768px;
  --breakpoint-lg: 992px;
  --breakpoint-xl: 1200px;
  --breakpoint-xxl: 1400px;
  
  /* Responsive spacing */
  --space-mobile-xs: 0.25rem;
  --space-mobile-sm: 0.5rem;
  --space-mobile-md: 1rem;
  --space-mobile-lg: 1.5rem;
  --space-mobile-xl: 2rem;
  
  /* Responsive typography */
  --text-mobile-xs: 0.75rem;
  --text-mobile-sm: 0.875rem;
  --text-mobile-base: 1rem;
  --text-mobile-lg: 1.125rem;
  --text-mobile-xl: 1.25rem;
  --text-mobile-2xl: 1.5rem;
  --text-mobile-3xl: 1.875rem;
}

/* ===================================================================
   AUTHENTICATION SYSTEM RESPONSIVE DESIGN
   ================================================================== */

/* Authentication Modal - Mobile Optimization */
@media (max-width: 767px) {
  .auth-modal {
    padding: 1rem;
    width: 100vw;
    height: 100vh;
    border-radius: 0;
    position: fixed;
    top: 0;
    left: 0;
    right: 0;
    bottom: 0;
    max-width: none;
    max-height: none;
    overflow-y: auto;
  }
  
  .auth-modal__header {
    padding: 1rem 1rem 0.5rem 1rem;
    position: sticky;
    top: 0;
    background: white;
    z-index: 10;
    border-bottom: 1px solid #e2e8f0;
  }
  
  .auth-modal__title {
    font-size: var(--text-mobile-xl);
  }
  
  .auth-modal__tabs {
    flex-direction: column;
    gap: 0;
  }
  
  .auth-tab {
    flex: 1;
    padding: 1rem;
    border-radius: 0;
    font-size: var(--text-mobile-sm);
  }
  
  .auth-form {
    padding: 1rem;
  }
  
  .auth-form__group {
    margin-bottom: 1.25rem;
  }
  
  .auth-form__input,
  .auth-form__select,
  .auth-form__textarea {
    padding: 1rem;
    font-size: var(--text-mobile-base);
    min-height: 48px; /* Touch target size */
  }
  
  .auth-form__button {
    padding: 1rem 1.5rem;
    font-size: var(--text-mobile-base);
    min-height: 48px;
    width: 100%;
  }
}

/* Password Validator - Mobile Responsive */
@media (max-width: 767px) {
  .password-strength-container {
    position: relative;
    margin-top: 0.75rem;
  }
  
  .password-requirements {
    grid-template-columns: 1fr;
    gap: 0.5rem;
    font-size: var(--text-mobile-sm);
  }
  
  .requirement-item {
    padding: 0.5rem;
  }
  
  .strength-meter {
    height: 6px;
    margin: 0.75rem 0;
  }
}

/* Contact Forms - Mobile Optimization */
@media (max-width: 767px) {
  .learntav-contact-tabs__nav {
    flex-direction: column;
    gap: 0;
    border-radius: 0;
    overflow-x: auto;
    -webkit-overflow-scrolling: touch;
  }
  
  .learntav-tab-btn {
    flex: none;
    min-width: auto;
    white-space: nowrap;
    padding: 1rem;
    border-radius: 0;
    font-size: var(--text-mobile-sm);
  }
  
  .learntav-form__row {
    flex-direction: column;
    gap: 1rem;
  }
  
  .learntav-form__input,
  .learntav-form__select,
  .learntav-form__textarea {
    font-size: var(--text-mobile-base);
    padding: 1rem;
    min-height: 48px;
  }
  
  .learntav-form__textarea {
    min-height: 120px;
  }
  
  .learntav-form__actions {
    flex-direction: column;
    gap: 0.75rem;
  }
  
  .learntav-btn--large {
    padding: 1rem 1.5rem;
    font-size: var(--text-mobile-base);
    width: 100%;
  }
}


/* Route Protection - Mobile Responsive */
@media (max-width: 767px) {
  .user-profile-dropdown {
    position: fixed;
    top: auto;
    bottom: 20px;
    right: 20px;
    left: 20px;
    z-index: 1000;
  }
  
  .user-profile-menu {
    position: relative;
    width: 100%;
    max-height: 50vh;
    overflow-y: auto;
    border-radius: 12px;
    box-shadow: 0 20px 60px rgba(0, 0, 0, 0.3);
  }
  
  .user-profile-menu-item {
    padding: 1rem 1.5rem;
    font-size: var(--text-mobile-base);
    min-height: 48px;
    display: flex;
    align-items: center;
  }
}

/* ===================================================================
   ACCESSIBILITY ENHANCEMENTS
   ================================================================== */

/* Focus Management */
*:focus {
  outline: 2px solid var(--primary, #007bff);
  outline-offset: 2px;
  border-radius: 4px;
}

/* Custom focus styles for interactive elements */
.learntav-btn:focus,
.auth-form__button:focus {
  outline: 2px solid var(--primary, #007bff);
  outline-offset: 2px;
  box-shadow: 0 0 0 4px rgba(0, 123, 255, 0.25);
}

.learntav-form__input:focus,
.learntav-form__select:focus,
.learntav-form__textarea:focus,
.auth-form__input:focus {
  outline: 2px solid var(--primary, #007bff);
  border-color: var(--primary, #007bff);
  box-shadow: 0 0 0 3px rgba(0, 123, 255, 0.1);
}

/* Skip Links */
.skip-link {
  position: absolute;
  top: -40px;
  left: 6px;
  background: var(--primary, #007bff);
  color: white;
  padding: 8px 16px;
  text-decoration: none;
  border-radius: 4px;
  z-index: 10000;
  font-weight: 600;
  transition: top 0.3s ease;
}

.skip-link:focus {
  top: 6px;
}

/* Screen Reader Only Content */
.sr-only {
  position: absolute;
  width: 1px;
  height: 1px;
  padding: 0;
  margin: -1px;
  overflow: hidden;
  clip: rect(0, 0, 0, 0);
  white-space: nowrap;
  border: 0;
}

.sr-only-focusable:focus {
  position: static;
  width: auto;
  height: auto;
  padding: inherit;
  margin: inherit;
  overflow: visible;
  clip: auto;
  white-space: normal;
}

/* High Contrast Mode Support */
@media (prefers-contrast: high) {
  .auth-modal,
  .learntav-form {
    border: 2px solid;
    background: white;
    color: black;
  }
  
  .learntav-btn--primary,
  .auth-form__button {
    background: black;
    color: white;
    border: 2px solid black;
  }
  
  .learntav-btn--primary:hover,
  .auth-form__button:hover {
    background: white;
    color: black;
  }
  
  .learntav-form__input,
  .auth-form__input {
    border: 2px solid black;
    background: white;
    color: black;
  }
}

/* Reduced Motion Support */
@media (prefers-reduced-motion: reduce) {
  *,
  *::before,
  *::after {
    animation-duration: 0.01ms !important;
    animation-iteration-count: 1 !important;
    transition-duration: 0.01ms !important;
    scroll-behavior: auto !important;
  }
  
  .auth-modal,
  .password-strength-container,
  .learntav-form__success,
  .learntav-form__error-global {
    animation: none;
    transition: none;
  }
}

/* Touch Device Optimizations */
@media (hover: none) and (pointer: coarse) {
  .learntav-btn,
  .auth-form__button,
  .keypad-btn,
  .nav-item,
  .learntav-tab-btn {
    min-height: 44px;
    padding: 0.75rem 1rem;
  }
  
  .learntav-form__input,
  .auth-form__input {
    min-height: 44px;
    padding: 0.75rem;
  }
  
  /* Remove hover effects on touch devices */
  .learntav-btn:hover,
  .auth-form__button:hover,
  .keypad-btn:hover,
  .nav-item:hover {
    background-color: initial;
    transform: none;
  }
  
  /* Add active states instead */
  .learntav-btn:active,
  .auth-form__button:active,
  .keypad-btn:active {
    transform: scale(0.95);
    transition: transform 0.1s ease;
  }
}

/* Dark Mode Support */
@media (prefers-color-scheme: dark) {
  :root {
    --bg-primary: #1a202c;
    --bg-secondary: #2d3748;
    --text-primary: #f7fafc;
    --text-secondary: #e2e8f0;
    --border-color: #4a5568;
  }
  
  .auth-modal,
  .learntav-form-container {
    background: var(--bg-secondary);
    color: var(--text-primary);
    border-color: var(--border-color);
  }
  
  .learntav-form__input,
  .auth-form__input {
    background: var(--bg-primary);
    color: var(--text-primary);
    border-color: var(--border-color);
  }
  
  .learntav-form__input::placeholder,
  .auth-form__input::placeholder {
    color: var(--text-secondary);
  }
}

/* Print Styles */
@media print {
  .auth-modal,
  .user-profile-dropdown,
  .learntav-nav__toggle,
  .skip-link {
    display: none !important;
  }
  
  .learntav-form {
    box-shadow: none;
    border: 1px solid #000;
  }
  
  .learntav-btn,
  .auth-form__button {
    border: 1px solid #000;
    background: white;
    color: black;
  }
}

/* ===================================================================
   MOBILE NAVIGATION ENHANCEMENTS
   ================================================================== */

/* Use consistent breakpoint with main.css (768px) and defer to main.css for navigation */
@media (max-width: 768px) {
  /* Override only specific navigation enhancements, let main.css handle primary nav styles */
  .learntav-nav {
    position: sticky !important;
    top: 0;
    left: 0;
    right: 0;
    z-index: 1000;
    background: rgba(255, 255, 255, 0.95);
    backdrop-filter: blur(10px);
    border-bottom: 1px solid rgba(0, 0, 0, 0.1);
  }
  
  /* Ensure mobile toggle is always visible */
  .learntav-nav__toggle {
    display: flex !important;
    width: 44px !important;
    height: 44px !important;
    margin-left: auto;
    flex-direction: column !important;
    justify-content: center !important;
    align-items: center !important;
    background: none !important;
    border: none !important;
    cursor: pointer !important;
    z-index: 1001 !important;
    gap: 4px !important;
    padding: 0.5rem !important;
  }
  
  .learntav-nav__toggle-line {
    width: 20px !important;
    height: 2px !important;
    background: var(--text-secondary, #6b7280) !important;
    transition: all 0.3s ease !important;
    border-radius: 1px !important;
    display: block !important;
  }
  
  /* Ensure navigation items are properly spaced for touch */
  .learntav-nav__link {
    min-height: 48px;
    display: flex;
    align-items: center;
    touch-action: manipulation;
  }
  
  .learntav-nav__link.nav-protected {
    background: rgba(255, 193, 7, 0.1);
    border-left: 4px solid #ffc107;
  }
}

/* ===================================================================
   FORM ACCESSIBILITY ENHANCEMENTS
   ================================================================== */

/* Error message styling */
.learntav-form__error,
.auth-form__error {
  color: #dc3545;
  font-size: var(--text-mobile-sm);
  margin-top: 0.25rem;
  display: flex;
  align-items: center;
  gap: 0.5rem;
}

.learntav-form__error::before,
.auth-form__error::before {
  content: '⚠️';
  font-size: 1rem;
}

/* Success indicators */
.learntav-form__success-indicator,
.auth-form__success-indicator {
  color: #28a745;
  font-size: var(--text-mobile-sm);
  margin-top: 0.25rem;
  display: flex;
  align-items: center;
  gap: 0.5rem;
}

.learntav-form__success-indicator::before,
.auth-form__success-indicator::before {
  content: '✅';
  font-size: 1rem;
}

/* Loading states */
.learntav-btn--loading,
.auth-form__button--loading {
  position: relative;
  color: transparent;
}

.learntav-btn--loading::after,
.auth-form__button--loading::after {
  content: '';
  position: absolute;
  top: 50%;
  left: 50%;
  transform: translate(-50%, -50%);
  width: 20px;
  height: 20px;
  border: 2px solid transparent;
  border-top: 2px solid currentColor;
  border-radius: 50%;
  animation: button-spinner 1s linear infinite;
}

@keyframes button-spinner {
  0% { transform: translate(-50%, -50%) rotate(0deg); }
  100% { transform: translate(-50%, -50%) rotate(360deg); }
}

/* ===================================================================
   UTILITY CLASSES
   ================================================================== */

/* Responsive visibility */
.show-mobile { display: none; }
.hide-mobile { display: block; }

@media (max-width: 767px) {
  .show-mobile { display: block; }
  .hide-mobile { display: none; }
}

.show-tablet { display: none; }
.hide-tablet { display: block; }

@media (min-width: 768px) and (max-width: 991px) {
  .show-tablet { display: block; }
  .hide-tablet { display: none; }
}

.show-desktop { display: none; }
.hide-desktop { display: block; }

@media (min-width: 992px) {
  .show-desktop { display: block; }
  .hide-desktop { display: none; }
}

/* Responsive spacing */
.p-mobile { padding: var(--space-mobile-md); }
.m-mobile { margin: var(--space-mobile-md); }
.gap-mobile { gap: var(--space-mobile-md); }

@media (max-width: 767px) {
  .p-mobile-sm { padding: var(--space-mobile-sm); }
  .p-mobile-lg { padding: var(--space-mobile-lg); }
  .m-mobile-sm { margin: var(--space-mobile-sm); }
  .m-mobile-lg { margin: var(--space-mobile-lg); }
}

/* Touch-friendly sizing */
.touch-target {
  min-height: 44px;
  min-width: 44px;
  display: flex;
  align-items: center;
  justify-content: center;
}

/* Accessible animations */
.fade-in {
  opacity: 0;
  animation: fade-in 0.5s ease forwards;
}

@keyframes fade-in {
  to { opacity: 1; }
}

.slide-up {
  transform: translateY(20px);
  opacity: 0;
  animation: slide-up 0.5s ease forwards;
}

@keyframes slide-up {
  to {
    transform: translateY(0);
    opacity: 1;
  }
}

/* Respect user's motion preferences */
@media (prefers-reduced-motion: reduce) {
  .fade-in,
  .slide-up {
    animation: none;
    opacity: 1;
    transform: none;
  }
}