/* Responsive CSS - Mobile-first responsive design */

/* Mobile First Approach - Base styles are for mobile */

/* Small devices (landscape phones, 576px and up) */
@media (min-width: 576px) {
  .container {
    max-width: 540px;
  }
  
  .hero-title {
    font-size: 3rem;
  }
  
  .features-grid {
    grid-template-columns: 1fr;
  }
}

/* Medium devices (tablets, 768px and up) */
@media (min-width: 768px) {
  .container {
    max-width: 720px;
  }
  
  .hero-actions {
    flex-wrap: nowrap;
  }
  
  .features-grid {
    grid-template-columns: repeat(2, 1fr);
  }
  
  .stats-grid {
    grid-template-columns: repeat(2, 1fr);
  }
  
  .actions-grid {
    grid-template-columns: repeat(2, 1fr);
  }
  
  .form-row {
    grid-template-columns: 1fr 1fr;
  }
}

/* Large devices (desktops, 992px and up) */
@media (min-width: 992px) {
  .container {
    max-width: 960px;
  }
  
  .features-grid {
    grid-template-columns: repeat(3, 1fr);
  }
  
  .stats-grid {
    grid-template-columns: repeat(4, 1fr);
  }
  
  .actions-grid {
    grid-template-columns: repeat(3, 1fr);
  }
}

/* Extra large devices (large desktops, 1200px and up) */
@media (min-width: 1200px) {
  .container {
    max-width: 1140px;
  }
}

/* Extra extra large devices (1400px and up) */
@media (min-width: 1400px) {
  .container {
    max-width: 1320px;
  }
}

/* Mobile-specific styles (max-width: 767px) */
@media (max-width: 767px) {
  /* Navigation */
  .sidebar {
    position: fixed;
    top: 0;
    left: -280px;
    height: 100vh;
    z-index: var(--z-fixed);
    transition: transform var(--transition-normal);
  }
  
  .sidebar.open {
    transform: translateX(280px);
  }
  
  .sidebar-toggle {
    display: flex;
  }
  
  .main-content {
    width: 100%;
  }
  
  .page-header {
    padding: var(--spacing-4);
  }
  
  .header-content {
    flex-direction: column;
    gap: var(--spacing-4);
    align-items: flex-start;
  }
  
  .page-title {
    font-size: var(--font-size-2xl);
  }
  
  .header-actions {
    width: 100%;
    justify-content: flex-end;
  }
  
  /* Dashboard */
  .dashboard-content {
    padding: var(--spacing-4);
  }
  
  .stats-grid {
    grid-template-columns: 1fr;
    gap: var(--spacing-4);
  }
  
  .stat-card {
    padding: var(--spacing-4);
  }
  
  .actions-grid {
    grid-template-columns: 1fr;
  }
  
  /* Forms */
  .form-row {
    grid-template-columns: 1fr;
    gap: var(--spacing-4);
  }
  
  .auth-card {
    padding: var(--spacing-6);
  }
  
  .form-navigation {
    flex-direction: column;
    gap: var(--spacing-3);
  }
  
  .form-navigation .btn {
    width: 100%;
  }
  
  /* Exam Interface */
  .exam-header {
    flex-direction: column;
    gap: var(--spacing-4);
    align-items: flex-start;
    padding: var(--spacing-4);
  }
  
  .exam-controls {
    width: 100%;
    justify-content: space-between;
  }
  
  .exam-content {
    flex-direction: column;
  }
  
  .question-nav {
    width: 100%;
    max-height: 200px;
    order: 2;
    border-right: none;
    border-top: 1px solid var(--gray-200);
  }
  
  .nav-toggle {
    display: flex;
    flex-direction: column;
    gap: 4px;
    background: none;
    border: none;
    cursor: pointer;
    padding: var(--spacing-2);
  }
  
  .nav-toggle span {
    width: 20px;
    height: 2px;
    background-color: var(--gray-600);
    transition: var(--transition-fast);
  }
  
  .question-grid {
    grid-template-columns: repeat(10, 1fr);
    gap: var(--spacing-1);
  }
  
  .question-area {
    order: 1;
  }
  
  .question-container {
    padding: var(--spacing-4);
  }
  
  .question-actions {
    flex-direction: column;
    gap: var(--spacing-4);
    padding: var(--spacing-4);
  }
  
  .action-buttons-left,
  .action-buttons-right {
    width: 100%;
    justify-content: center;
  }
  
  /* Modals */
  .modal-content {
    width: 95vw;
    max-height: 95vh;
    margin: var(--spacing-2);
  }
  
  .modal-header,
  .modal-body,
  .modal-footer {
    padding: var(--spacing-4);
  }
  
  .modal-footer {
    flex-direction: column;
    gap: var(--spacing-3);
  }
  
  .modal-footer .btn {
    width: 100%;
  }
  
  /* Exam Configuration Modal on Mobile */
  .exam-config-modal {
    width: 95vw !important;
    max-width: 95vw !important;
    margin: 1rem auto !important;
    border-radius: var(--radius-xl) !important;
  }
  
  .exam-config-modal .modal-header {
    padding: 1rem !important;
    text-align: center;
  }
  
  .exam-config-modal .modal-title {
    font-size: 1.5rem !important;
  }
  
  .exam-config-modal .modal-body {
    padding: 1rem !important;
    max-height: 70vh !important;
  }
  
  .exam-config-modal .modal-footer {
    padding: 1rem !important;
    flex-direction: column !important;
    gap: 0.5rem !important;
  }
  
  .exam-config-modal .modal-footer .btn {
    width: 100% !important;
    padding: 1rem !important;
    font-size: 1.1rem !important;
  }
  
  .exam-config-modal .subject-card {
    padding: 1rem !important;
    text-align: center;
  }
  
  .exam-config-modal .subject-icon-large {
    font-size: 3rem !important;
    margin-bottom: 0.5rem;
  }
  
  .exam-config-modal .subject-title {
    font-size: 1.5rem !important;
    margin-bottom: 0.5rem;
  }
  
  .exam-config-modal .subject-description {
    font-size: 0.9rem !important;
    margin-bottom: 1rem;
  }
  
  .exam-config-modal .subject-stats {
    justify-content: center !important;
    gap: 1rem !important;
    margin-bottom: 1rem;
  }
  
  .exam-config-modal .stat-item {
    flex-direction: column !important;
    gap: 0.25rem !important;
  }
  
  .exam-config-modal .config-card {
    padding: 1rem !important;
  }
  
  .exam-config-modal .config-header {
    text-align: center;
    margin-bottom: 1rem;
  }
  
  .exam-config-modal .config-title {
    font-size: 1.3rem !important;
    margin-bottom: 0.5rem;
  }
  
  .exam-config-modal .config-row {
    display: flex !important;
    flex-direction: column !important;
    gap: 1rem !important;
    margin-bottom: 1rem;
  }
  
  .exam-config-modal .config-group {
    margin-bottom: 1rem;
  }
  
  .exam-config-modal .config-label {
    font-size: 1rem !important;
    margin-bottom: 0.5rem !important;
  }
  
  .exam-config-modal .config-select {
    padding: 0.75rem !important;
    font-size: 1rem !important;
  }
  
  .exam-config-modal .checkbox-group {
    display: flex !important;
    flex-direction: column !important;
    gap: 0.75rem !important;
    padding: 1rem !important;
    max-height: 150px !important;
  }
  
  .exam-config-modal .checkbox-label {
    padding: 0.75rem !important;
    font-size: 1rem !important;
  }
  
  /* Tables */
  .table-responsive {
    overflow-x: auto;
  }
  
  /* Cards */
  .card-header,
  .card-body,
  .card-footer {
    padding: var(--spacing-4);
  }
  
  /* Search */
  .search-container {
    max-width: 100%;
  }
  
  /* Profile */
  .profile-overview {
    margin-bottom: var(--spacing-8);
  }
  
  .profile-card {
    flex-direction: column;
    text-align: center;
    padding: var(--spacing-6);
  }
  
  .profile-stats {
    flex-direction: column;
    gap: var(--spacing-4);
    margin-top: var(--spacing-6);
  }
  
  .tab-navigation {
    flex-wrap: wrap;
    gap: var(--spacing-2);
  }
  
  .tab-btn {
    flex: 1;
    min-width: calc(50% - var(--spacing-1));
  }
}

/* Tablet-specific styles (768px to 1023px) */
@media (min-width: 768px) and (max-width: 1023px) {
  .sidebar {
    width: 240px;
  }
  
  .question-nav {
    width: 240px;
  }
  
  .stats-grid {
    grid-template-columns: repeat(2, 1fr);
  }
  
  .actions-grid {
    grid-template-columns: repeat(2, 1fr);
  }
  
  .features-grid {
    grid-template-columns: repeat(2, 1fr);
  }
}

/* Touch device optimizations */
@media (hover: none) and (pointer: coarse) {
  /* Increase touch targets */
  .btn {
    min-height: 44px;
    padding: var(--spacing-3) var(--spacing-6);
  }
  
  .btn-small {
    min-height: 36px;
    padding: var(--spacing-2) var(--spacing-4);
  }
  
  .nav-link {
    min-height: 44px;
    padding: var(--spacing-4);
  }
  
  .form-input,
  .form-select {
    min-height: 44px;
    padding: var(--spacing-3) var(--spacing-4);
  }
  
  .tool-btn {
    width: 44px;
    height: 44px;
  }
  
  .question-nav-item {
    min-height: 44px;
    min-width: 44px;
  }
  
  /* Remove hover effects */
  .btn:hover,
  .card:hover,
  .feature-card:hover,
  .action-card:hover,
  .stat-card:hover {
    transform: none;
    box-shadow: var(--shadow-sm);
  }
  
  /* Optimize canvas for touch */
  #illustration-canvas {
    touch-action: none;
  }
}

/* High DPI displays */
@media (-webkit-min-device-pixel-ratio: 2), (min-resolution: 192dpi) {
  /* Optimize for retina displays */
  .loading-spinner {
    border-width: 2px;
  }
  
  .checkbox-custom {
    border-width: 1px;
  }
  
  /* Ensure crisp lines on canvas */
  #illustration-canvas {
    image-rendering: -webkit-optimize-contrast;
    image-rendering: crisp-edges;
  }
}

/* Landscape orientation on mobile */
@media (max-width: 767px) and (orientation: landscape) {
  .exam-header {
    padding: var(--spacing-2) var(--spacing-4);
  }
  
  .question-container {
    padding: var(--spacing-3);
  }
  
  .question-actions {
    padding: var(--spacing-3);
  }
  
  .modal-content {
    max-height: 90vh;
  }
}

/* Print styles */
@media print {
  .sidebar,
  .exam-header,
  .question-nav,
  .question-actions,
  .modal,
  .btn,
  .no-print {
    display: none !important;
  }
  
  .main-content {
    width: 100% !important;
    margin: 0 !important;
    padding: 0 !important;
  }
  
  .question-container {
    padding: 0 !important;
  }
  
  .page {
    min-height: auto !important;
  }
  
  .card,
  .auth-card {
    box-shadow: none !important;
    border: 1px solid #000 !important;
  }
}

/* Reduced motion preferences */
@media (prefers-reduced-motion: reduce) {
  .sidebar {
    transition: none;
  }
  
  .modal-content {
    transition: none;
  }
  
  .btn,
  .card,
  .nav-link {
    transition: none;
  }
  
  .btn:hover,
  .card:hover {
    transform: none;
  }
}

/* Dark mode responsive adjustments */
@media (prefers-color-scheme: dark) {
  [data-theme="auto"] {
    --white: #0f172a;
    --gray-50: #1e293b;
    --gray-100: #334155;
    --gray-200: #475569;
    --gray-300: #64748b;
    --gray-400: #94a3b8;
    --gray-500: #cbd5e1;
    --gray-600: #e2e8f0;
    --gray-700: #f1f5f9;
    --gray-800: #f8fafc;
    --gray-900: #ffffff;
  }
}

/* Container queries for modern browsers */
@supports (container-type: inline-size) {
  .responsive-container {
    container-type: inline-size;
  }
  
  @container (max-width: 400px) {
    .stats-grid {
      grid-template-columns: 1fr;
    }
  }
  
  @container (min-width: 600px) {
    .stats-grid {
      grid-template-columns: repeat(2, 1fr);
    }
  }
  
  @container (min-width: 900px) {
    .stats-grid {
      grid-template-columns: repeat(4, 1fr);
    }
  }
}