/**
 * Advanced Responsive Layout System for UfuqLMS
 * Mobile-first, accessible, and performant responsive design
 */

/* =================================================================
   1. RESPONSIVE GRID SYSTEM
   ================================================================= */

.responsive-grid {
  display: grid;
  gap: var(--space-4);
  width: 100%;
}

/* Mobile-first grid configurations */
.responsive-grid.cols-1 {
  grid-template-columns: 1fr;
}

.responsive-grid.cols-auto-fit {
  grid-template-columns: repeat(auto-fit, minmax(280px, 1fr));
}

.responsive-grid.cols-auto-fill {
  grid-template-columns: repeat(auto-fill, minmax(300px, 1fr));
}

/* Feature cards responsive grid */
.feature-grid {
  display: grid;
  gap: var(--space-6);
  grid-template-columns: 1fr;
}

@media (min-width: 640px) {
  .feature-grid {
    grid-template-columns: repeat(2, 1fr);
  }
}

@media (min-width: 1024px) {
  .feature-grid {
    grid-template-columns: repeat(3, 1fr);
  }
}

@media (min-width: 1280px) {
  .feature-grid {
    grid-template-columns: repeat(4, 1fr);
  }
}

/* Course cards responsive grid */
.course-grid {
  display: grid;
  gap: var(--space-6);
  grid-template-columns: 1fr;
}

@media (min-width: 640px) {
  .course-grid {
    grid-template-columns: repeat(2, 1fr);
  }
}

@media (min-width: 1024px) {
  .course-grid {
    grid-template-columns: repeat(3, 1fr);
  }
}

@media (min-width: 1536px) {
  .course-grid {
    grid-template-columns: repeat(4, 1fr);
  }
}

/* Dashboard grid layout */
.dashboard-grid {
  display: grid;
  gap: var(--space-6);
  grid-template-columns: 1fr;
}

@media (min-width: 768px) {
  .dashboard-grid {
    grid-template-columns: repeat(2, 1fr);
  }
}

@media (min-width: 1024px) {
  .dashboard-grid {
    grid-template-columns: repeat(3, 1fr);
  }

  .dashboard-grid.with-sidebar {
    grid-template-columns: 300px 1fr;
    grid-template-areas:
      "sidebar main";
  }
}

@media (min-width: 1280px) {
  .dashboard-grid {
    grid-template-columns: repeat(4, 1fr);
  }

  .dashboard-grid.with-sidebar {
    grid-template-columns: 320px 1fr;
  }
}

/* =================================================================
   2. RESPONSIVE NAVIGATION
   ================================================================= */

.nav-responsive {
  background: rgba(255, 255, 255, 0.95);
  backdrop-filter: blur(12px);
  border-bottom: 1px solid var(--neutral-200);
  position: sticky;
  top: 0;
  z-index: var(--z-50);
  box-shadow: var(--shadow-sm);
}

.nav-container {
  max-width: var(--breakpoint-2xl);
  margin: 0 auto;
  padding: 0 var(--space-4);
  display: flex;
  align-items: center;
  justify-content: space-between;
  min-height: 64px;
}

.nav-brand {
  display: flex;
  align-items: center;
  gap: var(--space-3);
  text-decoration: none;
  color: var(--neutral-900);
  font-weight: var(--font-bold);
  font-size: var(--text-lg);
  flex-shrink: 0;
}

.nav-brand-icon {
  width: 40px;
  height: 40px;
  border-radius: var(--radius-xl);
  display: flex;
  align-items: center;
  justify-content: center;
  background: linear-gradient(135deg, var(--primary-600), var(--secondary-600));
  color: white;
  font-size: var(--text-lg);
}

.nav-menu {
  display: none;
  align-items: center;
  gap: var(--space-2);
  list-style: none;
}

.nav-menu.desktop {
  display: none;
}

@media (min-width: 1024px) {
  .nav-menu.desktop {
    display: flex;
  }
}

.nav-link {
  display: flex;
  align-items: center;
  gap: var(--space-2);
  padding: var(--space-2) var(--space-3);
  color: var(--neutral-600);
  text-decoration: none;
  border-radius: var(--radius-lg);
  font-weight: var(--font-medium);
  font-size: var(--text-sm);
  transition: var(--transition-colors);
  white-space: nowrap;
  min-height: var(--touch-target-min);
}

.nav-link:hover {
  color: var(--neutral-800);
  background-color: var(--neutral-100);
}

.nav-link.active {
  color: var(--primary-700);
  background-color: var(--primary-50);
  font-weight: var(--font-semibold);
}

.nav-actions {
  display: flex;
  align-items: center;
  gap: var(--space-2);
  flex-shrink: 0;
}

/* Mobile Navigation */
.mobile-nav-toggle {
  display: flex;
  align-items: center;
  justify-content: center;
  width: var(--touch-target-min);
  height: var(--touch-target-min);
  border: none;
  background: none;
  color: var(--neutral-600);
  border-radius: var(--radius-lg);
  cursor: pointer;
  transition: var(--transition-colors);
}

@media (min-width: 1024px) {
  .mobile-nav-toggle {
    display: none;
  }
}

.mobile-nav-toggle:hover {
  background-color: var(--neutral-100);
  color: var(--neutral-800);
}

.mobile-nav-menu {
  display: none;
  position: absolute;
  top: 100%;
  left: 0;
  right: 0;
  background: white;
  border-top: 1px solid var(--neutral-200);
  box-shadow: var(--shadow-lg);
  padding: var(--space-4);
  flex-direction: column;
  gap: var(--space-2);
}

.mobile-nav-menu.open {
  display: flex;
}

.mobile-nav-link {
  display: flex;
  align-items: center;
  gap: var(--space-3);
  padding: var(--space-3);
  color: var(--neutral-700);
  text-decoration: none;
  border-radius: var(--radius-lg);
  font-weight: var(--font-medium);
  transition: var(--transition-colors);
  min-height: var(--touch-target-min);
}

.mobile-nav-link:hover {
  background-color: var(--primary-50);
  color: var(--primary-700);
}

.mobile-nav-link.active {
  background-color: var(--primary-100);
  color: var(--primary-800);
  font-weight: var(--font-semibold);
}

/* =================================================================
   3. RESPONSIVE CARDS
   ================================================================= */

.card-responsive {
  background-color: var(--neutral-0);
  border-radius: var(--radius-xl);
  box-shadow: var(--shadow-sm);
  border: 1px solid var(--neutral-200);
  overflow: hidden;
  transition: var(--transition-all);
  height: 100%;
  display: flex;
  flex-direction: column;
}

.card-responsive:hover {
  box-shadow: var(--shadow-lg);
  transform: translateY(-4px);
}

.card-responsive.interactive {
  cursor: pointer;
}

.card-image {
  width: 100%;
  height: 200px;
  object-fit: cover;
  background-color: var(--neutral-100);
}

@media (min-width: 768px) {
  .card-image {
    height: 240px;
  }
}

.card-content {
  padding: var(--space-6);
  flex-grow: 1;
  display: flex;
  flex-direction: column;
}

.card-title {
  font-size: var(--text-lg);
  font-weight: var(--font-semibold);
  color: var(--neutral-900);
  margin-bottom: var(--space-2);
  line-height: var(--leading-tight);
}

.card-description {
  color: var(--neutral-600);
  font-size: var(--text-sm);
  line-height: var(--leading-relaxed);
  margin-bottom: var(--space-4);
  flex-grow: 1;
}

.card-meta {
  display: flex;
  flex-wrap: wrap;
  gap: var(--space-2);
  margin-bottom: var(--space-4);
}

.card-meta-item {
  display: flex;
  align-items: center;
  gap: var(--space-1);
  font-size: var(--text-xs);
  color: var(--neutral-500);
}

.card-actions {
  display: flex;
  gap: var(--space-2);
  margin-top: auto;
}

.card-actions.full-width .btn {
  flex: 1;
}

/* Feature Cards */
.feature-card {
  background: linear-gradient(135deg, var(--neutral-0), var(--neutral-50));
  border-radius: var(--radius-2xl);
  padding: var(--space-6);
  text-align: center;
  border: 1px solid var(--neutral-200);
  transition: var(--transition-all);
  height: 100%;
}

.feature-card:hover {
  transform: translateY(-8px);
  box-shadow: var(--shadow-xl);
  border-color: var(--primary-200);
}

.feature-icon {
  width: 64px;
  height: 64px;
  border-radius: var(--radius-xl);
  display: flex;
  align-items: center;
  justify-content: center;
  margin: 0 auto var(--space-4);
  font-size: var(--text-2xl);
  color: white;
}

.feature-icon.primary {
  background: linear-gradient(135deg, var(--primary-500), var(--primary-600));
}

.feature-icon.secondary {
  background: linear-gradient(135deg, var(--secondary-500), var(--secondary-600));
}

.feature-icon.success {
  background: linear-gradient(135deg, var(--success-500), var(--success-600));
}

.feature-icon.warning {
  background: linear-gradient(135deg, var(--warning-500), var(--warning-600));
}

.feature-title {
  font-size: var(--text-lg);
  font-weight: var(--font-bold);
  color: var(--neutral-900);
  margin-bottom: var(--space-3);
}

.feature-description {
  color: var(--neutral-600);
  font-size: var(--text-sm);
  line-height: var(--leading-relaxed);
  margin-bottom: var(--space-4);
}

.feature-list {
  list-style: none;
  text-align: left;
  font-size: var(--text-sm);
  color: var(--neutral-600);
}

.feature-list li {
  padding: var(--space-1) 0;
  display: flex;
  align-items: center;
  gap: var(--space-2);
}

.feature-list li:before {
  content: "✓";
  color: var(--success-600);
  font-weight: var(--font-bold);
  flex-shrink: 0;
}

/* =================================================================
   4. RESPONSIVE FORMS
   ================================================================= */

.form-responsive {
  width: 100%;
  max-width: 100%;
}

.form-row {
  display: grid;
  gap: var(--space-4);
  grid-template-columns: 1fr;
  margin-bottom: var(--space-6);
}

@media (min-width: 768px) {
  .form-row.cols-2 {
    grid-template-columns: repeat(2, 1fr);
  }

  .form-row.cols-3 {
    grid-template-columns: repeat(3, 1fr);
  }
}

.form-group-responsive {
  display: flex;
  flex-direction: column;
  gap: var(--space-2);
}

.form-label-responsive {
  font-weight: var(--font-medium);
  color: var(--neutral-700);
  font-size: var(--text-sm);
  display: flex;
  align-items: center;
  gap: var(--space-1);
}

.form-label-required::after {
  content: "*";
  color: var(--error-500);
}

.form-input-responsive,
.form-select-responsive,
.form-textarea-responsive {
  width: 100%;
  padding: var(--space-3);
  border: 2px solid var(--neutral-300);
  border-radius: var(--radius-lg);
  font-size: 16px; /* Prevent zoom on iOS */
  background-color: var(--neutral-0);
  transition: var(--transition-colors);
  min-height: var(--touch-target-min);
}

@media (min-width: 768px) {
  .form-input-responsive,
  .form-select-responsive,
  .form-textarea-responsive {
    font-size: var(--text-base);
  }
}

.form-input-responsive:focus,
.form-select-responsive:focus,
.form-textarea-responsive:focus {
  outline: none;
  border-color: var(--primary-500);
  box-shadow: var(--focus-ring);
}

.form-input-responsive.error,
.form-select-responsive.error,
.form-textarea-responsive.error {
  border-color: var(--error-500);
}

.form-input-responsive.error:focus,
.form-select-responsive.error:focus,
.form-textarea-responsive.error:focus {
  box-shadow: 0 0 0 2px var(--error-500);
}

.form-help-text {
  font-size: var(--text-sm);
  color: var(--neutral-500);
  margin-top: var(--space-1);
}

.form-error-text {
  font-size: var(--text-sm);
  color: var(--error-600);
  margin-top: var(--space-1);
  display: flex;
  align-items: center;
  gap: var(--space-1);
}

.form-actions {
  display: flex;
  flex-direction: column;
  gap: var(--space-3);
  margin-top: var(--space-6);
}

@media (min-width: 640px) {
  .form-actions {
    flex-direction: row;
    justify-content: flex-end;
  }

  .form-actions.full-width {
    justify-content: stretch;
  }

  .form-actions.full-width .btn {
    flex: 1;
  }
}

/* =================================================================
   5. RESPONSIVE TABLES
   ================================================================= */

.table-responsive {
  width: 100%;
  overflow-x: auto;
  -webkit-overflow-scrolling: touch;
}

.table {
  width: 100%;
  border-collapse: collapse;
  font-size: var(--text-sm);
}

.table th,
.table td {
  padding: var(--space-3);
  text-align: left;
  border-bottom: 1px solid var(--neutral-200);
  vertical-align: middle;
}

.table th {
  background-color: var(--neutral-50);
  font-weight: var(--font-semibold);
  color: var(--neutral-700);
  font-size: var(--text-xs);
  text-transform: uppercase;
  letter-spacing: 0.05em;
  position: sticky;
  top: 0;
  z-index: 1;
}

.table tbody tr:hover {
  background-color: var(--neutral-50);
}

/* Mobile table stack layout */
@media (max-width: 767px) {
  .table-stack {
    display: block;
  }

  .table-stack thead {
    display: none;
  }

  .table-stack tbody {
    display: block;
  }

  .table-stack tr {
    display: block;
    margin-bottom: var(--space-4);
    padding: var(--space-4);
    background: var(--neutral-0);
    border-radius: var(--radius-lg);
    box-shadow: var(--shadow-sm);
    border: 1px solid var(--neutral-200);
  }

  .table-stack td {
    display: block;
    border: none;
    padding: var(--space-2) 0;
    text-align: right;
    position: relative;
    padding-left: 50%;
  }

  .table-stack td::before {
    content: attr(data-label);
    position: absolute;
    left: 0;
    top: var(--space-2);
    font-weight: var(--font-semibold);
    color: var(--neutral-700);
    font-size: var(--text-sm);
  }
}

/* =================================================================
   6. RESPONSIVE MODALS
   ================================================================= */

.modal-responsive {
  position: fixed;
  inset: 0;
  z-index: var(--z-50);
  display: flex;
  align-items: center;
  justify-content: center;
  padding: var(--space-4);
}

.modal-overlay {
  position: absolute;
  inset: 0;
  background-color: rgba(0, 0, 0, 0.5);
  backdrop-filter: blur(4px);
}

.modal-content {
  position: relative;
  background-color: var(--neutral-0);
  border-radius: var(--radius-2xl);
  box-shadow: var(--shadow-2xl);
  width: 100%;
  max-width: 32rem;
  max-height: 90vh;
  overflow-y: auto;
  display: flex;
  flex-direction: column;
}

@media (min-width: 640px) {
  .modal-content {
    max-width: 40rem;
  }
}

@media (min-width: 768px) {
  .modal-content {
    max-width: 48rem;
  }
}

.modal-header {
  padding: var(--space-6);
  border-bottom: 1px solid var(--neutral-200);
  display: flex;
  align-items: center;
  justify-content: space-between;
  flex-shrink: 0;
}

.modal-title {
  font-size: var(--text-lg);
  font-weight: var(--font-semibold);
  color: var(--neutral-900);
  margin: 0;
}

.modal-close {
  width: var(--touch-target-min);
  height: var(--touch-target-min);
  border-radius: var(--radius-lg);
  border: none;
  background: none;
  color: var(--neutral-400);
  cursor: pointer;
  transition: var(--transition-colors);
  display: flex;
  align-items: center;
  justify-content: center;
}

.modal-close:hover {
  color: var(--neutral-600);
  background-color: var(--neutral-100);
}

.modal-body {
  padding: var(--space-6);
  flex-grow: 1;
  overflow-y: auto;
}

.modal-footer {
  padding: var(--space-6);
  border-top: 1px solid var(--neutral-200);
  display: flex;
  justify-content: flex-end;
  gap: var(--space-3);
  flex-shrink: 0;
}

@media (max-width: 639px) {
  .modal-footer {
    flex-direction: column;
  }

  .modal-footer .btn {
    width: 100%;
  }
}

/* =================================================================
   7. RESPONSIVE IMAGES AND MEDIA
   ================================================================= */

.img-responsive {
  max-width: 100%;
  height: auto;
  border-radius: var(--radius-lg);
}

.video-responsive {
  position: relative;
  width: 100%;
  height: 0;
  padding-bottom: 56.25%; /* 16:9 aspect ratio */
  overflow: hidden;
  border-radius: var(--radius-lg);
  background-color: var(--neutral-900);
}

.video-responsive iframe,
.video-responsive video {
  position: absolute;
  top: 0;
  left: 0;
  width: 100%;
  height: 100%;
  border: 0;
  border-radius: var(--radius-lg);
}

/* =================================================================
   8. RESPONSIVE SPACING UTILITIES
   ================================================================= */

/* Mobile spacing overrides */
@media (max-width: 639px) {
  .mobile\:p-4 { padding: var(--space-4); }
  .mobile\:px-4 { padding-left: var(--space-4); padding-right: var(--space-4); }
  .mobile\:py-4 { padding-top: var(--space-4); padding-bottom: var(--space-4); }
  .mobile\:m-2 { margin: var(--space-2); }
  .mobile\:mx-4 { margin-left: var(--space-4); margin-right: var(--space-4); }
  .mobile\:my-4 { margin-top: var(--space-4); margin-bottom: var(--space-4); }
  .mobile\:gap-4 { gap: var(--space-4); }
  .mobile\:text-sm { font-size: var(--text-sm); }
  .mobile\:text-base { font-size: var(--text-base); }
  .mobile\:rounded-lg { border-radius: var(--radius-lg); }
}

/* Tablet spacing overrides */
@media (min-width: 640px) and (max-width: 1023px) {
  .tablet\:p-6 { padding: var(--space-6); }
  .tablet\:px-6 { padding-left: var(--space-6); padding-right: var(--space-6); }
  .tablet\:py-6 { padding-top: var(--space-6); padding-bottom: var(--space-6); }
  .tablet\:gap-6 { gap: var(--space-6); }
}

/* Desktop spacing overrides */
@media (min-width: 1024px) {
  .desktop\:p-8 { padding: var(--space-8); }
  .desktop\:px-8 { padding-left: var(--space-8); padding-right: var(--space-8); }
  .desktop\:py-8 { padding-top: var(--space-8); padding-bottom: var(--space-8); }
  .desktop\:gap-8 { gap: var(--space-8); }
}

/* =================================================================
   9. RESPONSIVE VISIBILITY
   ================================================================= */

/* Hide on mobile */
.mobile-hidden {
  display: none;
}

@media (min-width: 640px) {
  .mobile-hidden {
    display: initial;
  }
}

/* Show only on mobile */
.mobile-only {
  display: initial;
}

@media (min-width: 640px) {
  .mobile-only {
    display: none;
  }
}

/* Hide on tablet */
@media (min-width: 640px) and (max-width: 1023px) {
  .tablet-hidden {
    display: none;
  }
}

/* Show only on tablet */
.tablet-only {
  display: none;
}

@media (min-width: 640px) and (max-width: 1023px) {
  .tablet-only {
    display: initial;
  }
}

/* Hide on desktop */
@media (min-width: 1024px) {
  .desktop-hidden {
    display: none;
  }
}

/* Show only on desktop */
.desktop-only {
  display: none;
}

@media (min-width: 1024px) {
  .desktop-only {
    display: initial;
  }
}

/* =================================================================
   10. RESPONSIVE RTL SUPPORT
   ================================================================= */

[dir="rtl"] .responsive-grid,
[dir="rtl"] .feature-grid,
[dir="rtl"] .course-grid,
[dir="rtl"] .dashboard-grid {
  direction: rtl;
}

[dir="rtl"] .nav-container {
  direction: rtl;
}

[dir="rtl"] .nav-menu {
  flex-direction: row-reverse;
}

[dir="rtl"] .card-actions {
  flex-direction: row-reverse;
}

[dir="rtl"] .form-actions {
  flex-direction: row-reverse;
}

@media (min-width: 640px) {
  [dir="rtl"] .form-actions {
    flex-direction: row-reverse;
    justify-content: flex-start;
  }
}

[dir="rtl"] .modal-footer {
  justify-content: flex-start;
}

[dir="rtl"] .table th,
[dir="rtl"] .table td {
  text-align: right;
}

@media (max-width: 767px) {
  [dir="rtl"] .table-stack td {
    text-align: left;
    padding-right: 50%;
    padding-left: 0;
  }

  [dir="rtl"] .table-stack td::before {
    right: 0;
    left: auto;
  }
}

/* =================================================================
   11. PERFORMANCE OPTIMIZATIONS
   ================================================================= */

/* Will-change for smooth animations */
.card-responsive:hover,
.feature-card:hover,
.btn:hover {
  will-change: transform, box-shadow;
}

.card-responsive:not(:hover),
.feature-card:not(:hover),
.btn:not(:hover) {
  will-change: auto;
}

/* Content visibility for better performance */
.large-content {
  content-visibility: auto;
  contain-intrinsic-size: 300px;
}

/* Optimize fonts for better performance */
@media (max-width: 767px) {
  body {
    font-display: swap;
    text-rendering: optimizeSpeed;
  }
}

@media (min-width: 768px) {
  body {
    text-rendering: optimizeLegibility;
  }
}

/* =================================================================
   12. TOUCH AND INTERACTION IMPROVEMENTS
   ================================================================= */

/* Better touch targets */
@media (hover: none) and (pointer: coarse) {
  .btn,
  .nav-link,
  .mobile-nav-link,
  .modal-close {
    min-height: 48px;
    min-width: 48px;
  }

  /* Remove hover effects on touch devices */
  .card-responsive:hover,
  .feature-card:hover {
    transform: none;
    box-shadow: var(--shadow-sm);
  }

  /* Better focus states for touch */
  .btn:focus,
  .form-input-responsive:focus,
  .form-select-responsive:focus,
  .form-textarea-responsive:focus {
    outline: 3px solid var(--primary-500);
    outline-offset: 2px;
  }
}

/* Improve scrolling on touch devices */
.modal-body,
.table-responsive {
  -webkit-overflow-scrolling: touch;
  overflow-scrolling: touch;
}

/* =================================================================
   13. DARK MODE RESPONSIVE SUPPORT
   ================================================================= */

@media (prefers-color-scheme: dark) {
  .card-responsive,
  .feature-card {
    background-color: var(--neutral-100);
    border-color: var(--neutral-300);
  }

  .nav-responsive {
    background: rgba(23, 23, 23, 0.95);
  }

  .modal-content {
    background-color: var(--neutral-100);
  }

  .table th {
    background-color: var(--neutral-200);
  }

  .table tbody tr:hover {
    background-color: var(--neutral-200);
  }
}

.dark .card-responsive,
.dark .feature-card {
  background-color: var(--neutral-100);
  border-color: var(--neutral-300);
}

.dark .nav-responsive {
  background: rgba(23, 23, 23, 0.95);
}

.dark .modal-content {
  background-color: var(--neutral-100);
}

.dark .table th {
  background-color: var(--neutral-200);
}

.dark .table tbody tr:hover {
  background-color: var(--neutral-200);
}