/**
 * Mobile-Optimized Styles
 * Responsive design enhancements for mobile devices
 */

/* ===================================
   Mobile-First Base Styles
   =================================== */

@media (max-width: 768px) {
  /* Improve touch targets */
  button,
  a,
  input,
  select,
  textarea {
    min-height: 44px;
    min-width: 44px;
  }

  /* Better spacing on mobile */
  .container {
    padding-left: 1rem;
    padding-right: 1rem;
  }

  /* Mobile typography */
  body {
    font-size: 16px; /* Prevent zoom on iOS */
  }

  h1 {
    font-size: 1.75rem;
  }

  h2 {
    font-size: 1.5rem;
  }

  h3 {
    font-size: 1.25rem;
  }

  /* Card adjustments */
  .section-card {
    margin-bottom: 1rem;
    border-radius: 12px;
  }

  .section-header {
    padding: 1rem;
  }

  .section-body {
    padding: 1rem;
  }

  /* Button improvements */
  .modern-btn {
    padding: 0.75rem 1.5rem;
    font-size: 1rem;
    white-space: nowrap;
  }

  .modern-btn-primary,
  .modern-btn-secondary {
    width: 100%;
    margin-bottom: 0.5rem;
  }

  /* Form improvements */
  .form-control,
  .form-select {
    font-size: 16px; /* Prevent zoom on iOS */
    padding: 0.75rem;
  }

  /* Table responsiveness */
  .table-responsive {
    border-radius: 12px;
    overflow-x: auto;
    -webkit-overflow-scrolling: touch;
  }

  /* Grid adjustments */
  .grid-auto-fit {
    grid-template-columns: 1fr;
  }

  /* Navbar mobile improvements */
  .navbar-collapse {
    background: rgba(255, 255, 255, 0.98);
    backdrop-filter: blur(10px);
    border-radius: 12px;
    margin-top: 1rem;
    padding: 1rem;
    box-shadow: 0 4px 12px rgba(0, 0, 0, 0.1);
  }

  .dark-mode .navbar-collapse {
    background: rgba(30, 41, 59, 0.98);
  }

  .navbar-nav {
    gap: 0.5rem;
  }

  .nav-link {
    padding: 0.75rem 1rem;
    border-radius: 8px;
  }

  /* Modal improvements */
  .modal-dialog {
    margin: 0.5rem;
  }

  .modal-content {
    border-radius: 16px;
  }

  /* Toast notifications mobile */
  .toast {
    width: calc(100% - 2rem);
    max-width: 100%;
    margin: 0 1rem;
  }

  /* Stats cards mobile */
  .stat-card {
    padding: 1rem;
  }

  .stat-value {
    font-size: 1.5rem;
  }

  /* Profile sections mobile */
  .profile-header {
    flex-direction: column;
    text-align: center;
  }

  .profile-stats {
    grid-template-columns: repeat(2, 1fr);
    gap: 0.75rem;
  }

  /* Leaderboard mobile */
  .leaderboard-table {
    font-size: 0.9rem;
  }

  .leaderboard-rank {
    min-width: 40px;
  }

  /* Friends page mobile */
  .friend-card {
    padding: 1rem;
  }

  .search-results {
    margin-top: 1rem;
  }

  /* Quiz mobile improvements */
  .quiz-question {
    padding: 1.5rem 1rem;
  }

  .quiz-options {
    gap: 0.75rem;
  }

  .quiz-option {
    padding: 1rem;
    font-size: 0.95rem;
  }

  /* Achievement badges mobile */
  .achievement-badge {
    width: 100%;
    max-width: none;
  }

  .achievement-grid {
    grid-template-columns: 1fr;
  }

  /* Notification center mobile */
  .notification-center {
    width: calc(100vw - 2rem);
    max-width: 400px;
    left: 50%;
    transform: translateX(-50%);
    right: auto;
  }
}

/* ===================================
   Mobile Navigation Enhancements
   =================================== */

@media (max-width: 991px) {
  .modern-navbar {
    padding: 0.75rem 0;
  }

  .navbar-brand {
    font-size: 1.25rem;
  }

  .brand-icon {
    font-size: 1.5rem;
  }

  .navbar-toggler {
    padding: 0.5rem;
    border: none;
    background: rgba(102, 126, 234, 0.1);
    border-radius: 8px;
  }

  .navbar-toggler:focus {
    box-shadow: 0 0 0 3px rgba(102, 126, 234, 0.2);
  }

  .navbar-nav .nav-link {
    display: flex;
    align-items: center;
    gap: 0.5rem;
  }

  .nav-icon {
    font-size: 1.25rem;
  }

  .modern-badge {
    margin-left: auto;
  }
}

/* ===================================
   Touch-Friendly Interactions
   =================================== */

/* Remove hover effects on touch devices */
@media (hover: none) and (pointer: coarse) {
  .modern-btn:hover {
    transform: none;
  }

  .card:hover {
    transform: none;
  }

  .nav-link:hover {
    background: transparent;
  }

  /* Add active states instead */
  .modern-btn:active {
    transform: scale(0.98);
  }

  .card:active {
    transform: scale(0.99);
  }
}

/* ===================================
   Mobile Quiz Interface
   =================================== */

@media (max-width: 768px) {
  .quiz-container {
    padding: 1rem;
  }

  .quiz-header {
    flex-direction: column;
    gap: 0.75rem;
    margin-bottom: 1.5rem;
  }

  .quiz-progress {
    width: 100%;
  }

  .quiz-timer {
    width: 100%;
    justify-content: center;
  }

  .quiz-question-card {
    padding: 1.5rem 1rem;
    margin-bottom: 1rem;
  }

  .quiz-question-text {
    font-size: 1.1rem;
    line-height: 1.5;
  }

  .quiz-image {
    max-height: 200px;
    margin: 1rem 0;
  }

  .quiz-options-grid {
    grid-template-columns: 1fr;
    gap: 0.75rem;
  }

  .quiz-option-card {
    padding: 1rem;
    min-height: 60px;
    cursor: pointer;
    -webkit-tap-highlight-color: transparent;
  }

  .quiz-option-card:active {
    transform: scale(0.98);
  }

  .quiz-navigation {
    flex-direction: column;
    gap: 0.75rem;
    margin-top: 1.5rem;
  }

  .quiz-nav-btn {
    width: 100%;
    padding: 0.875rem;
    font-size: 1rem;
  }

  /* Results page mobile */
  .quiz-results {
    padding: 1rem;
  }

  .results-summary {
    grid-template-columns: 1fr;
    gap: 0.75rem;
  }

  .result-stat {
    padding: 1rem;
  }

  .results-breakdown {
    margin-top: 1.5rem;
  }

  .question-review-card {
    padding: 1rem;
    margin-bottom: 0.75rem;
  }
}

/* ===================================
   Mobile Lesson Cards
   =================================== */

@media (max-width: 768px) {
  .lesson-grid {
    grid-template-columns: 1fr;
    gap: 1rem;
  }

  .lesson-card {
    display: flex;
    flex-direction: column;
  }

  .lesson-image {
    width: 100%;
    height: 180px;
    object-fit: cover;
    border-radius: 12px 12px 0 0;
  }

  .lesson-content {
    padding: 1rem;
    flex: 1;
  }

  .lesson-title {
    font-size: 1.25rem;
    margin-bottom: 0.5rem;
  }

  .lesson-description {
    font-size: 0.9rem;
    margin-bottom: 1rem;
  }

  .lesson-meta {
    display: flex;
    flex-wrap: wrap;
    gap: 0.5rem;
    margin-top: auto;
  }

  .lesson-actions {
    display: flex;
    gap: 0.5rem;
    margin-top: 1rem;
  }

  .lesson-btn {
    flex: 1;
    padding: 0.75rem;
  }
}

/* ===================================
   Mobile Spaced Repetition
   =================================== */

@media (max-width: 768px) {
  .flashcard {
    min-height: 300px;
    padding: 1.5rem;
  }

  .flashcard-front,
  .flashcard-back {
    padding: 1.5rem;
  }

  .flashcard-question {
    font-size: 1.1rem;
  }

  .flashcard-answer {
    font-size: 1rem;
  }

  .flashcard-controls {
    flex-direction: column;
    gap: 0.75rem;
    margin-top: 1.5rem;
  }

  .flashcard-btn {
    width: 100%;
    padding: 0.875rem;
  }

  /* Swipe indicator */
  .swipe-indicator {
    position: fixed;
    bottom: 100px;
    left: 50%;
    transform: translateX(-50%);
    background: rgba(0, 0, 0, 0.7);
    color: white;
    padding: 0.5rem 1rem;
    border-radius: 20px;
    font-size: 0.85rem;
    opacity: 0;
    transition: opacity 0.3s ease;
    pointer-events: none;
    z-index: 1000;
  }

  .swipe-indicator.show {
    opacity: 1;
  }
}

/* ===================================
   Mobile Analytics & Charts
   =================================== */

@media (max-width: 768px) {
  .chart-container {
    height: 250px;
    margin-bottom: 1.5rem;
  }

  .analytics-filters {
    flex-direction: column;
    gap: 0.75rem;
  }

  .filter-group {
    width: 100%;
  }

  .stats-grid {
    grid-template-columns: 1fr;
    gap: 1rem;
  }

  .stat-card-large {
    padding: 1.25rem;
  }

  .chart-legend {
    flex-wrap: wrap;
    gap: 0.5rem;
  }
}

/* ===================================
   Mobile Achievements
   =================================== */

@media (max-width: 768px) {
  .achievement-header {
    flex-direction: column;
    text-align: center;
    gap: 1rem;
  }

  .achievement-filters {
    width: 100%;
    flex-direction: column;
    gap: 0.5rem;
  }

  .achievement-card {
    padding: 1.25rem;
  }

  .achievement-icon {
    font-size: 2.5rem;
  }

  .achievement-title {
    font-size: 1.1rem;
  }

  .achievement-description {
    font-size: 0.85rem;
  }

  .achievement-progress-bar {
    height: 8px;
    margin-top: 0.75rem;
  }

  .achievement-reward {
    margin-top: 0.75rem;
    font-size: 0.85rem;
  }
}

/* ===================================
   Mobile Settings & Profile
   =================================== */

@media (max-width: 768px) {
  .settings-tabs {
    flex-direction: column;
    gap: 0.5rem;
  }

  .settings-tab {
    width: 100%;
    justify-content: flex-start;
  }

  .settings-section {
    padding: 1rem;
  }

  .setting-row {
    flex-direction: column;
    align-items: flex-start;
    gap: 0.5rem;
  }

  .setting-control {
    width: 100%;
  }

  .profile-avatar {
    width: 100px;
    height: 100px;
  }

  .profile-info {
    margin-top: 1rem;
  }

  .profile-badges {
    flex-wrap: wrap;
    justify-content: center;
  }
}

/* ===================================
   Mobile Subscription Page
   =================================== */

@media (max-width: 768px) {
  .pricing-grid {
    grid-template-columns: 1fr;
    gap: 1.5rem;
  }

  .pricing-card {
    width: 100%;
    max-width: 100%;
  }

  .pricing-header {
    padding: 1.5rem 1rem;
  }

  .pricing-price {
    font-size: 2rem;
  }

  .pricing-features {
    padding: 1rem;
  }

  .feature-comparison {
    overflow-x: auto;
    -webkit-overflow-scrolling: touch;
  }
}

/* ===================================
   Mobile Pull-to-Refresh Indicator
   =================================== */

.ptr-indicator {
  position: fixed;
  top: 60px;
  left: 50%;
  transform: translateX(-50%) translateY(-100px);
  background: rgba(102, 126, 234, 0.95);
  color: white;
  padding: 0.75rem 1.5rem;
  border-radius: 25px;
  font-size: 0.9rem;
  font-weight: 600;
  box-shadow: 0 4px 12px rgba(0, 0, 0, 0.2);
  opacity: 0;
  transition: all 0.3s cubic-bezier(0.4, 0, 0.2, 1);
  z-index: 9999;
  pointer-events: none;
}

.ptr-indicator.active {
  transform: translateX(-50%) translateY(0);
  opacity: 1;
}

.ptr-indicator .ptr-icon {
  display: inline-block;
  margin-right: 0.5rem;
  animation: spin 1s linear infinite;
}

@keyframes spin {
  from {
    transform: rotate(0deg);
  }
  to {
    transform: rotate(360deg);
  }
}

/* ===================================
   Safe Area Insets (iPhone X+)
   =================================== */

@supports (padding-top: env(safe-area-inset-top)) {
  body {
    padding-top: env(safe-area-inset-top);
    padding-bottom: env(safe-area-inset-bottom);
  }

  .modern-navbar {
    padding-top: calc(0.75rem + env(safe-area-inset-top));
  }

  .pwa-install-banner,
  .pwa-update-notification {
    bottom: calc(20px + env(safe-area-inset-bottom));
  }

  .toast-container {
    top: calc(80px + env(safe-area-inset-top));
  }
}

/* ===================================
   Landscape Mode Optimizations
   =================================== */

@media (max-height: 500px) and (orientation: landscape) {
  .quiz-question-card {
    padding: 1rem;
  }

  .quiz-options-grid {
    grid-template-columns: repeat(2, 1fr);
  }

  .modal-dialog {
    max-height: 90vh;
    overflow-y: auto;
  }

  .section-card {
    margin-bottom: 0.75rem;
  }
}

/* ===================================
   Reduce Motion for Accessibility
   =================================== */

@media (prefers-reduced-motion: reduce) {
  *,
  *::before,
  *::after {
    animation-duration: 0.01ms !important;
    animation-iteration-count: 1 !important;
    transition-duration: 0.01ms !important;
  }
}