:root {
  --background: 195 43% 98%;
  --foreground: 222 58% 11%;
  --card: 0 0% 100%;
  --card-foreground: 222 58% 11%;
  --primary: 178 84% 43%;
  --primary-foreground: 0 0% 100%;
  --secondary: 210 40% 96%;
  --secondary-foreground: 222 58% 11%;
  --muted: 210 36% 96%;
  --muted-foreground: 217 18% 42%;
  --accent: 252 89% 70%;
  --accent-foreground: 0 0% 100%;
  --destructive: 0 74% 60%;
  --destructive-foreground: 0 0% 100%;
  --border: 214 30% 88%;
  --input: 214 30% 88%;
  --ring: 178 84% 43%;
  --radius: 0.5rem;

  --primary-hsl: 178 84% 43%;
  --accent-hsl: 252 89% 70%;
  --bg-soft: hsl(var(--background));
  --text-dark: hsl(var(--foreground));
  --text-muted: hsl(var(--muted-foreground));
  --border-color: hsl(var(--border));
  --sidebar-width: 256px;
}

body {
  font-family: -apple-system, BlinkMacSystemFont, "Segoe UI", Roboto, "Helvetica Neue", Arial, sans-serif;
  color: hsl(var(--foreground));
  background: radial-gradient(circle at top left, hsl(var(--primary) / 0.14), transparent 28rem), radial-gradient(circle at top right, hsl(var(--accent) / 0.12), transparent 32rem), hsl(var(--background));
  min-height: 100vh;
  -webkit-font-smoothing: antialiased;
  -moz-osx-font-smoothing: grayscale;
}

.bg-soft {
  background: hsl(var(--background));
}

.brand-gradient {
  background: linear-gradient(to right, hsl(var(--primary)), hsl(180 80% 45%), hsl(var(--accent)));
}

.text-primary {
  color: hsl(var(--primary)) !important;
}

.text-muted {
  color: hsl(var(--muted-foreground)) !important;
}

/* Sidebar */
.sidebar {
  position: fixed;
  top: 0;
  left: 0;
  bottom: 0;
  width: var(--sidebar-width);
  background: hsl(var(--card));
  border-right: 1px solid var(--border-color);
  z-index: 1030;
  overflow-y: auto;
  padding: 0;
  display: flex;
  flex-direction: column;
}

.sidebar-brand {
  padding: 1.5rem 1rem 1.25rem;
  border-bottom: 1px solid var(--border-color);
}

.sidebar-brand a {
  text-decoration: none;
  font-weight: 600;
  font-size: 1.25rem;
  color: hsl(var(--foreground));
  letter-spacing: -0.01em;
}

.sidebar-brand .brand-icon {
  width: 36px;
  height: 36px;
  background: linear-gradient(135deg, hsl(var(--primary)), hsl(var(--accent)));
  border-radius: 8px;
  display: inline-flex;
  align-items: center;
  justify-content: center;
  color: #fff;
  font-weight: 700;
  margin-right: 10px;
  font-size: 1rem;
  position: relative;
}

.sidebar-brand .brand-icon::after {
  content: '';
  position: absolute;
  top: -2px;
  right: -2px;
  width: 6px;
  height: 6px;
  border-radius: 50%;
  background: hsl(var(--accent));
  border: 2px solid hsl(var(--card));
}

.sidebar-nav {
  padding: 0.75rem 0;
  flex: 1;
  min-height: 0;
  overflow-y: auto;
}

.sidebar-nav .nav-item {
  margin: 1px 8px;
}

.sidebar-nav .nav-link {
  display: flex;
  align-items: center;
  gap: 12px;
  padding: 0.5rem 0.75rem;
  color: hsl(var(--muted-foreground));
  text-decoration: none;
  border-radius: 6px;
  font-size: 0.875rem;
  font-weight: 500;
  transition: all 0.15s ease;
}

.sidebar-nav .nav-link:hover {
  background: hsl(var(--primary) / 0.08);
  color: hsl(var(--foreground));
}

.sidebar-nav .nav-link.active {
  background: hsl(var(--primary) / 0.1);
  color: hsl(var(--primary));
  font-weight: 600;
}

.sidebar-nav .nav-link i {
  font-size: 1.15rem;
  width: 20px;
  text-align: center;
  flex-shrink: 0;
}

.sidebar-nav hr {
  margin: 0.5rem 1rem;
  color: var(--border-color);
  opacity: 1;
}

.sidebar-footer {
  padding: 1rem;
  border-top: 1px solid var(--border-color);
  background: linear-gradient(135deg, hsl(var(--primary) / 0.04), hsl(var(--accent) / 0.04));
  margin: 0.5rem;
  border-radius: 8px;
  border: 1px solid hsl(var(--primary) / 0.12);
}

.user-info {
  display: flex;
  align-items: center;
  gap: 10px;
}

.user-avatar {
  width: 36px;
  height: 36px;
  border-radius: 50%;
  background: linear-gradient(135deg, hsl(var(--primary)), hsl(var(--accent)));
  display: flex;
  align-items: center;
  justify-content: center;
  color: #fff;
  font-weight: 600;
  font-size: 0.875rem;
  flex-shrink: 0;
}

.user-name {
  font-size: 0.875rem;
  font-weight: 600;
  color: hsl(var(--foreground));
  line-height: 1.2;
}

.user-role {
  font-size: 0.75rem;
  color: hsl(var(--muted-foreground));
}

/* Main content */
.main-content {
  margin-left: var(--sidebar-width);
  min-height: 100vh;
  transition: margin-left 0.2s ease;
}

.sidebar.collapsed ~ .main-content {
  margin-left: 64px;
}

.top-bar {
  background: hsl(var(--card) / 0.9);
  backdrop-filter: blur(12px);
  -webkit-backdrop-filter: blur(12px);
  border-bottom: 1px solid var(--border-color);
  padding: 0 2rem;
  height: 64px;
  position: sticky;
  top: 0;
  z-index: 1020;
}

.page-content {
  padding: 2rem;
  max-width: 1440px;
  margin: 0 auto;
  width: 100%;
}

/* Cards */
.card {
  border: 1px solid var(--border-color);
  border-radius: 8px;
  box-shadow: 0 1px 3px hsl(210 80% 2% / 0.06);
  transition: box-shadow 0.15s ease;
  background: hsl(var(--card));
}

.card:hover {
  box-shadow: 0 4px 12px hsl(210 80% 2% / 0.08);
}

.card-header {
  background: transparent;
  border-bottom: 1px solid var(--border-color);
  padding: 1.25rem 1.5rem;
  font-weight: 600;
}

.card-body {
  padding: 1.5rem;
}

/* Surface utility (for items that need .surface styling) */
.surface {
  border-radius: 8px;
  border: 1px solid var(--border-color);
  background: hsl(var(--card));
  box-shadow: 0 1px 3px hsl(210 80% 2% / 0.06);
}

/* Stat cards */
.stat-card {
  padding: 1.5rem;
  border-radius: 8px;
  background: hsl(var(--card));
  border: 1px solid var(--border-color);
  box-shadow: 0 1px 3px hsl(210 80% 2% / 0.06);
}

.stat-card .stat-icon {
  width: 48px;
  height: 48px;
  border-radius: 8px;
  display: flex;
  align-items: center;
  justify-content: center;
  font-size: 1.5rem;
  margin-bottom: 0.75rem;
}

.stat-card .stat-icon.cyan {
  background: hsl(var(--primary) / 0.12);
  color: hsl(var(--primary));
}

.stat-card .stat-icon.violet {
  background: hsl(var(--accent) / 0.12);
  color: hsl(var(--accent));
}

.stat-card .stat-icon.blue {
  background: hsl(210 80% 50% / 0.12);
  color: hsl(210 80% 50%);
}

.stat-card .stat-icon.orange {
  background: hsl(38 92% 50% / 0.12);
  color: hsl(38 92% 50%);
}

.stat-card .stat-value {
  font-size: 1.75rem;
  font-weight: 700;
  color: hsl(var(--foreground));
  letter-spacing: -0.02em;
}

.stat-card .stat-label {
  font-size: 0.875rem;
  color: hsl(var(--muted-foreground));
  margin-top: 2px;
}

/* Gradient stat card (new) */
.stat-card-gradient {
  padding: 1.5rem;
  border-radius: 8px;
  border: 1px solid var(--border-color);
  background: hsl(var(--card));
  position: relative;
  overflow: hidden;
}

.stat-card-gradient::before {
  content: '';
  position: absolute;
  top: 0;
  left: 0;
  right: 0;
  height: 3px;
  border-radius: 8px 8px 0 0;
}

.stat-card-gradient.cyan::before {
  background: linear-gradient(to right, hsl(var(--primary)), hsl(180 80% 45%));
}

.stat-card-gradient.violet::before {
  background: linear-gradient(to right, hsl(var(--accent)), hsl(260 85% 65%));
}

.stat-card-gradient.blue::before {
  background: linear-gradient(to right, hsl(210 80% 50%), hsl(200 75% 50%));
}

.stat-card-gradient.orange::before {
  background: linear-gradient(to right, hsl(38 92% 50%), hsl(30 85% 55%));
}

.stat-card-gradient .stat-icon {
  width: 44px;
  height: 44px;
  border-radius: 8px;
  display: flex;
  align-items: center;
  justify-content: center;
  font-size: 1.25rem;
  margin-bottom: 1rem;
}

.stat-card-gradient .stat-icon.cyan {
  background: hsl(var(--primary) / 0.1);
  color: hsl(var(--primary));
}

.stat-card-gradient .stat-icon.violet {
  background: hsl(var(--accent) / 0.1);
  color: hsl(var(--accent));
}

.stat-card-gradient .stat-icon.blue {
  background: hsl(210 80% 50% / 0.1);
  color: hsl(210 80% 50%);
}

.stat-card-gradient .stat-icon.orange {
  background: hsl(38 92% 50% / 0.1);
  color: hsl(38 92% 50%);
}

.stat-card-gradient .stat-value {
  font-size: 1.75rem;
  font-weight: 700;
  color: hsl(var(--foreground));
}

.stat-card-gradient .stat-label {
  font-size: 0.8rem;
  color: hsl(var(--muted-foreground));
  text-transform: uppercase;
  letter-spacing: 0.04em;
  font-weight: 500;
}

/* Buttons — alignment fix */
.btn {
  display: inline-flex;
  align-items: center;
  justify-content: center;
  gap: 0.5rem;
  border-radius: 6px;
  font-weight: 500;
  transition: all 0.15s ease;
  line-height: 1;
}

.btn-primary {
  background: hsl(var(--primary));
  border-color: hsl(var(--primary));
  color: hsl(var(--primary-foreground));
  box-shadow: 0 14px 32px hsl(var(--primary) / 0.24);
}

.btn-primary:hover {
  background: hsl(var(--primary) / 0.9);
  border-color: hsl(var(--primary));
  color: hsl(var(--primary-foreground));
  opacity: 0.92;
}

.btn-success {
  background: hsl(160 80% 40%);
  border-color: hsl(160 80% 40%);
  color: #fff;
}

.btn-success:hover {
  background: hsl(160 70% 35%);
  border-color: hsl(160 70% 35%);
  color: #fff;
}

.btn-danger {
  background: hsl(var(--destructive));
  border-color: hsl(var(--destructive));
  color: #fff;
}

.btn-danger:hover {
  background: hsl(var(--destructive) / 0.9);
  border-color: hsl(var(--destructive));
  color: #fff;
}

.btn-outline-primary {
  color: hsl(var(--primary));
  border-color: hsl(var(--primary));
}

.btn-outline-primary:hover {
  background: hsl(var(--primary));
  border-color: hsl(var(--primary));
  color: #fff;
}

.brand-gradient-btn {
  background: linear-gradient(to right, hsl(var(--primary)), hsl(180 80% 45%), hsl(var(--accent)));
  border: none;
  color: #fff;
  box-shadow: 0 14px 32px hsl(var(--primary) / 0.24);
}

.brand-gradient-btn:hover {
  background: linear-gradient(to right, hsl(var(--primary) / 0.9), hsl(180 70% 40%), hsl(var(--accent) / 0.9));
  color: #fff;
  opacity: 0.92;
}

.btn-lg {
  height: 48px;
  padding: 0 1.5rem;
  font-size: 1rem;
}

.btn-sm {
  height: 32px;
  padding: 0 0.75rem;
  font-size: 0.8125rem;
}

.btn-outline-secondary {
  border-color: var(--border-color);
  color: hsl(var(--muted-foreground));
}

.btn-outline-secondary:hover {
  background: hsl(var(--secondary));
  border-color: var(--border-color);
  color: hsl(var(--foreground));
}

/* Icon-only buttons */
.btn-icon {
  display: inline-flex;
  align-items: center;
  justify-content: center;
  gap: 0;
}

/* Light outline (CTA banner) */
.btn-outline-light {
  display: inline-flex;
  align-items: center;
  justify-content: center;
  gap: 0.5rem;
  border-color: hsla(0,0%,100%,0.4);
  color: #fff;
}

.btn-outline-light:hover {
  background: hsla(0,0%,100%,0.1);
  border-color: hsla(0,0%,100%,0.6);
  color: #fff;
}

/* Auth Google button */
.btn-google {
  display: inline-flex;
  align-items: center;
  justify-content: center;
  gap: 0.75rem;
  height: 48px;
  padding: 0 1.5rem;
  font-size: 1rem;
  font-weight: 500;
  border: 1px solid var(--border-color);
  background: hsl(var(--card));
  color: hsl(var(--foreground));
  border-radius: 6px;
  text-decoration: none;
  transition: all 0.15s ease;
}

.btn-google:hover {
  background: hsl(var(--secondary));
  border-color: var(--border-color);
  color: hsl(var(--foreground));
}

.btn-google .google-icon {
  display: inline-flex;
  align-items: center;
  justify-content: center;
  width: 20px;
  height: 20px;
}

.btn-google .google-icon svg {
  width: 20px;
  height: 20px;
}

/* Badge */
.badge {
  font-weight: 500;
  font-size: 0.75rem;
  padding: 0.25rem 0.65rem;
  border-radius: 6px;
}

.badge-primary {
  background: hsl(var(--primary) / 0.1);
  color: hsl(var(--primary));
  border: 1px solid hsl(var(--primary) / 0.15);
}

.badge-accent {
  background: hsl(var(--accent) / 0.1);
  color: hsl(var(--accent));
  border: 1px solid hsl(var(--accent) / 0.15);
}

/* Status badge */
.status-badge {
  display: inline-flex;
  align-items: center;
  gap: 4px;
  padding: 0.25rem 0.75rem;
  border-radius: 20px;
  font-size: 0.8rem;
  font-weight: 600;
}

.status-badge.created {
  background: hsl(38 92% 50% / 0.1);
  color: hsl(38 92% 50%);
}

.status-badge.paid {
  background: hsl(var(--primary) / 0.1);
  color: hsl(var(--primary));
}

.status-badge.waiting_confirmation {
  background: hsl(38 92% 50% / 0.15);
  color: hsl(38 92% 50%);
}

.status-badge.rejected {
  background: hsl(var(--destructive) / 0.1);
  color: hsl(var(--destructive));
}

.status-badge.declined,
.status-badge.error,
.status-badge.cancelled {
  background: hsl(var(--destructive) / 0.1);
  color: hsl(var(--destructive));
}

/* Course card */
.course-card {
  border: 1px solid var(--border-color);
  border-radius: 8px;
  overflow: hidden;
  background: hsl(var(--card));
  transition: transform 0.2s ease, box-shadow 0.2s ease;
  box-shadow: 0 1px 3px hsl(210 80% 2% / 0.06);
}

.course-card:hover {
  transform: translateY(-3px);
  box-shadow: 0 8px 24px hsl(210 80% 2% / 0.1);
}

.course-card-img {
  height: 144px;
  background: linear-gradient(135deg, hsl(var(--primary) / 0.24), hsl(var(--accent) / 0.18));
  display: flex;
  align-items: center;
  justify-content: center;
  color: hsl(var(--primary));
  font-size: 2.5rem;
  overflow: hidden;
  position: relative;
}

.course-card-img img {
  width: 100%;
  height: 100%;
  object-fit: cover;
}

.course-card-body {
  padding: 1rem 1.25rem;
}

.course-card-title {
  font-size: 1.05rem;
  font-weight: 600;
  margin-bottom: 0.375rem;
  color: hsl(var(--foreground));
  line-height: 1.3;
}

.course-card-text {
  font-size: 0.8125rem;
  color: hsl(var(--muted-foreground));
  display: -webkit-box;
  -webkit-line-clamp: 2;
  -webkit-box-orient: vertical;
  overflow: hidden;
  line-height: 1.5;
}

.course-card-footer {
  padding: 0.75rem 1.25rem;
  border-top: 1px solid var(--border-color);
  display: flex;
  justify-content: space-between;
  align-items: center;
}

/* Hero section */
.hero-section {
  border-radius: 12px;
  padding: 2rem 2.5rem;
  margin-bottom: 2rem;
  background: linear-gradient(135deg, hsl(var(--primary) / 0.08), hsl(var(--accent) / 0.08));
  border: 1px solid hsl(var(--primary) / 0.1);
}

.hero-section h1 {
  font-weight: 700;
  color: hsl(var(--foreground));
  letter-spacing: -0.02em;
}

/* Lesson item */
.lesson-item {
  display: flex;
  align-items: center;
  gap: 12px;
  padding: 0.75rem 1rem;
  border-radius: 6px;
  border: 1px solid var(--border-color);
  margin-bottom: 6px;
  transition: background 0.15s ease, border-color 0.15s ease;
}

.lesson-item:hover {
  background: hsl(var(--primary) / 0.04);
  border-color: hsl(var(--primary) / 0.3);
}

.lesson-item.active-lesson {
  background: hsl(var(--primary) / 0.1);
  border-color: hsl(var(--primary));
  border-left: 3px solid hsl(var(--primary));
}

.lesson-status {
  width: 28px;
  height: 28px;
  border-radius: 50%;
  display: flex;
  align-items: center;
  justify-content: center;
  flex-shrink: 0;
  font-size: 0.8125rem;
}

.lesson-status.done {
  background: hsl(160 80% 40% / 0.1);
  color: hsl(160 80% 40%);
}

.lesson-status.active {
  background: hsl(var(--primary) / 0.1);
  color: hsl(var(--primary));
}

.lesson-status.locked {
  background: hsl(var(--secondary));
  color: hsl(var(--muted-foreground));
}

/* Progress */
.progress-custom {
  height: 8px;
  border-radius: 4px;
  background: hsl(var(--secondary));
}

.progress-custom .progress-bar {
  background: linear-gradient(135deg, hsl(var(--primary)), hsl(var(--accent)));
  border-radius: 4px;
}

/* Tables */
.table-custom {
  border-collapse: separate;
  border-spacing: 0 4px;
}

.table-custom thead th {
  border: none;
  font-size: 0.75rem;
  text-transform: uppercase;
  letter-spacing: 0.05em;
  color: hsl(var(--muted-foreground));
  padding: 0.75rem 1rem;
  font-weight: 600;
}

.table-custom tbody tr {
  background: hsl(var(--card));
  border-radius: 8px;
  box-shadow: 0 1px 2px hsl(210 80% 2% / 0.04);
}

.table-custom tbody td {
  border: none;
  padding: 0.75rem 1rem;
  vertical-align: middle;
}

.table-custom tbody tr:first-child td:first-child {
  border-top-left-radius: 8px;
}

.table-custom tbody tr:first-child td:last-child {
  border-top-right-radius: 8px;
}

.table-custom tbody tr:last-child td:first-child {
  border-bottom-left-radius: 8px;
}

.table-custom tbody tr:last-child td:last-child {
  border-bottom-right-radius: 8px;
}

/* Auth pages */
.auth-container {
  min-height: 100vh;
  display: flex;
  align-items: center;
}

.auth-card {
  border: 1px solid var(--border-color);
  border-radius: 8px;
  overflow: hidden;
  background: hsl(var(--card));
  box-shadow: 0 24px 80px hsl(210 80% 2% / 0.12);
}

.auth-benefits {
  background: linear-gradient(135deg, hsl(var(--primary) / 0.03), hsl(var(--accent) / 0.03));
  padding: 3rem;
  display: flex;
  flex-direction: column;
  justify-content: center;
  height: 100%;
}

.auth-benefits h3 {
  font-weight: 700;
  margin-bottom: 1rem;
}

.auth-benefits .benefit-item {
  display: flex;
  gap: 12px;
  margin-bottom: 1rem;
  padding: 0.75rem;
  border-radius: 6px;
}

.auth-benefits .benefit-item:hover {
  background: hsl(var(--primary) / 0.05);
}

.auth-benefits .benefit-icon {
  width: 40px;
  height: 40px;
  border-radius: 8px;
  display: flex;
  align-items: center;
  justify-content: center;
  flex-shrink: 0;
}

.auth-form {
  padding: 3rem;
}

/* Inbox */
.message-item {
  padding: 1rem 1.25rem;
  border-bottom: 1px solid var(--border-color);
  transition: background 0.15s ease;
}

.message-item:hover {
  background: hsl(var(--primary) / 0.04);
}

.message-item.unread {
  background: hsl(var(--primary) / 0.04);
  border-left: 3px solid hsl(var(--primary));
}

/* Alerts */
.alert {
  border-radius: 8px;
  border: none;
}

/* Footer */
.footer-mini {
  text-align: center;
  padding: 1.5rem;
  color: hsl(var(--muted-foreground));
  font-size: 0.8rem;
  border-top: 1px solid var(--border-color);
  margin-top: auto;
}

/* Toast container */
.toast-container {
  position: fixed;
  top: 1rem;
  right: 1rem;
  z-index: 9999;
}

/* Sidebar collapse toggle button */
.sidebar-collapse-btn {
  position: absolute;
  top: 1.25rem;
  right: -14px;
  width: 28px;
  height: 28px;
  border-radius: 50%;
  background: hsl(var(--card));
  border: 1px solid var(--border-color);
  display: flex;
  align-items: center;
  justify-content: center;
  cursor: pointer;
  z-index: 10;
  font-size: 0.75rem;
  color: hsl(var(--muted-foreground));
  transition: transform 0.2s ease;
  padding: 0;
  line-height: 1;
}
.sidebar-collapse-btn:hover {
  background: hsl(var(--secondary));
  color: hsl(var(--foreground));
}
.sidebar.collapsed .sidebar-collapse-btn {
  transform: rotate(180deg);
}

/* Sidebar collapsed state */
.sidebar.collapsed {
  width: 64px;
  overflow: visible;
}
.sidebar.collapsed .sidebar-brand span,
.sidebar.collapsed .sidebar-brand img,
.sidebar.collapsed .sidebar-brand .brand-icon::after,
.sidebar.collapsed .sidebar-nav .nav-link span,
.sidebar.collapsed .sidebar-nav .nav-link .badge,
.sidebar.collapsed .sidebar-widget,
.sidebar.collapsed .sidebar-footer,
.sidebar.collapsed .sidebar-nav hr {
  display: none;
}
.sidebar.collapsed .sidebar-nav .nav-link {
  justify-content: center;
  padding: 0.6rem;
  margin: 2px 8px;
}
.sidebar.collapsed .sidebar-nav .nav-link i {
  font-size: 1.25rem;
  margin: 0;
}
.sidebar.collapsed .sidebar-brand {
  padding: 1.25rem 0;
  text-align: center;
}
.sidebar.collapsed .sidebar-brand a {
  justify-content: center;
}
.sidebar.collapsed .sidebar-brand .brand-icon {
  margin-right: 0;
}

/* Hover expand from collapsed */
.sidebar.collapsed.expanding {
  width: var(--sidebar-width);
  z-index: 1031;
  box-shadow: 4px 0 24px hsl(210 80% 2% / 0.15);
}
.sidebar.collapsed.expanding .sidebar-brand span,
.sidebar.collapsed.expanding .sidebar-nav .nav-link span,
.sidebar.collapsed.expanding .sidebar-nav .nav-link .badge,
.sidebar.collapsed.expanding .sidebar-widget,
.sidebar.collapsed.expanding .sidebar-footer {
  display: revert;
}
.sidebar.collapsed.expanding .sidebar-nav .nav-link {
  justify-content: revert;
  padding: 0.5rem 0.75rem;
}
.sidebar.collapsed.expanding .sidebar-nav .nav-link i {
  font-size: 1.15rem;
}
.sidebar.collapsed.expanding .sidebar-brand {
  padding: 1.5rem 1rem 1.25rem;
  text-align: revert;
}
.sidebar.collapsed.expanding .sidebar-brand a {
  justify-content: revert;
}
.sidebar.collapsed.expanding .sidebar-brand .brand-icon {
  margin-right: 10px;
}

/* Mobile toggle */
.mobile-toggle {
  display: none;
}

/* Sidebar overlay (mobile) */
.sidebar-overlay {
  display: none;
  position: fixed;
  inset: 0;
  background: rgba(0,0,0,0.4);
  z-index: 1029;
}
.sidebar-overlay.show {
  display: block;
}

@media (max-width: 991.98px) {
  .sidebar {
    transform: translateX(-100%);
    transition: transform 0.3s ease;
    z-index: 1031;
    width: var(--sidebar-width) !important;
  }
  .sidebar.show {
    transform: translateX(0);
  }
  .sidebar.collapsed,
  .sidebar.collapsed.expanding {
    width: var(--sidebar-width) !important;
  }
  .sidebar.collapsed .sidebar-brand span,
  .sidebar.collapsed .sidebar-nav .nav-link span,
  .sidebar.collapsed .sidebar-nav .nav-link .badge,
  .sidebar.collapsed .sidebar-widget,
  .sidebar.collapsed .sidebar-footer {
    display: revert;
  }
  .sidebar.collapsed .sidebar-nav .nav-link {
    justify-content: revert;
    padding: 0.5rem 0.75rem;
  }
  .sidebar.collapsed .sidebar-nav .nav-link i {
    font-size: 1.15rem;
  }
  .sidebar.collapsed .sidebar-brand {
    padding: 1.5rem 1rem 1.25rem;
    text-align: revert;
  }
  .sidebar.collapsed .sidebar-brand a {
    justify-content: revert;
  }
  .sidebar.collapsed .sidebar-brand .brand-icon {
    margin-right: 10px;
  }
  .sidebar-collapse-btn {
    display: none;
  }
  .main-content {
    margin-left: 0;
  }
  .sidebar.collapsed ~ .main-content {
    margin-left: 0;
  }
  .mobile-toggle {
    display: inline-block;
  }
  .page-content {
    padding: 1rem;
  }
}

/* Cart */
.cart-item {
  display: flex;
  align-items: center;
  gap: 1rem;
  padding: 1rem;
  border: 1px solid var(--border-color);
  border-radius: 8px;
  margin-bottom: 0.5rem;
  background: hsl(var(--card));
}

/* Material icons */
.material-icon {
  width: 36px;
  height: 36px;
  border-radius: 6px;
  display: inline-flex;
  align-items: center;
  justify-content: center;
  font-size: 1rem;
}

.material-icon.pdf { background: hsl(var(--destructive) / 0.1); color: hsl(var(--destructive)); }
.material-icon.pptx { background: hsl(38 92% 50% / 0.1); color: hsl(38 92% 50%); }
.material-icon.image { background: hsl(210 80% 50% / 0.1); color: hsl(210 80% 50%); }
.material-icon.link { background: hsl(var(--primary) / 0.1); color: hsl(var(--primary)); }
.material-icon.gdrive { background: hsl(160 80% 40% / 0.1); color: hsl(160 80% 40%); }
.material-icon.github { background: hsl(222 58% 11% / 0.1); color: hsl(222 58% 11%); }

/* Form elements */
.form-control, .form-select {
  border-radius: 6px;
  border-color: var(--border-color);
  padding: 0.5rem 0.75rem;
  font-size: 0.875rem;
  height: 44px;
  color: hsl(var(--foreground));
  background: hsl(var(--card));
}

.form-control:focus, .form-select:focus {
  border-color: hsl(var(--ring));
  box-shadow: 0 0 0 2px hsl(var(--ring) / 0.2);
}

.form-control-sm {
  height: 32px;
  font-size: 0.8125rem;
}

.form-label {
  font-size: 0.875rem;
  font-weight: 500;
  margin-bottom: 0.375rem;
  color: hsl(var(--foreground));
}

/* Landing page specific */
.landing-hero {
  padding: 5rem 0 4rem;
  position: relative;
}

.landing-hero h1 {
  font-size: 3.5rem;
  font-weight: 700;
  letter-spacing: -0.03em;
  line-height: 1.1;
}

.landing-hero .lead {
  font-size: 1.125rem;
  line-height: 1.75;
}

.landing-stat {
  text-align: center;
}

.landing-stat-value {
  font-size: 1.75rem;
  font-weight: 700;
  color: hsl(var(--primary));
}

.landing-stat-label {
  font-size: 0.75rem;
  color: hsl(var(--muted-foreground));
  text-transform: uppercase;
  letter-spacing: 0.04em;
}

.hero-card {
  border-radius: 12px;
  overflow: hidden;
  box-shadow: 0 28px 90px hsl(210 80% 2% / 0.18);
  background: hsl(var(--card));
}

.hero-card-header {
  background: linear-gradient(135deg, #0f172a, #0e7490);
  padding: 1.5rem;
  color: #fff;
}

/* Feature card */
.feature-card {
  border-radius: 8px;
  border: 1px solid var(--border-color);
  background: hsl(var(--card));
  padding: 1.5rem;
  transition: box-shadow 0.2s ease, transform 0.2s ease;
}

.feature-card:hover {
  box-shadow: 0 4px 12px hsl(210 80% 2% / 0.08);
  transform: translateY(-2px);
}

.feature-card-icon {
  width: 40px;
  height: 40px;
  border-radius: 6px;
  background: hsl(222 58% 11%);
  color: #fff;
  display: flex;
  align-items: center;
  justify-content: center;
  font-size: 1.25rem;
}

.feature-card h5 {
  font-size: 1rem;
  font-weight: 600;
  margin-top: 1.25rem;
  color: hsl(var(--foreground));
}

.feature-card p {
  font-size: 0.875rem;
  color: hsl(var(--muted-foreground));
  line-height: 1.6;
  margin-top: 0.5rem;
}

/* CTA banner */
.cta-banner {
  background: linear-gradient(to right, hsl(178 90% 30%), hsl(var(--primary)));
  padding: 4rem 0;
  color: #fff;
}

.cta-banner h2 {
  font-size: 2rem;
  font-weight: 600;
  letter-spacing: -0.01em;
}

.cta-banner p {
  color: hsl(0 0% 100% / 0.8);
  font-size: 1.125rem;
}

.cta-banner .btn-outline-light {
  border-color: hsl(0 0% 100% / 0.4);
  color: #fff;
  background: transparent;
}

.cta-banner .btn-outline-light:hover {
  background: hsl(0 0% 100% / 0.1);
  border-color: hsl(0 0% 100% / 0.6);
}

/* Dashboard grid */
.dashboard-grid {
  display: grid;
  grid-template-columns: 1fr;
  gap: 1rem;
}

@media (min-width: 768px) {
  .dashboard-grid {
    grid-template-columns: repeat(6, 1fr);
  }
}

@media (min-width: 1200px) {
  .dashboard-grid {
    grid-template-columns: repeat(12, 1fr);
  }
}

.dashboard-grid .col-span-3 {
  grid-column: span 1;
}

@media (min-width: 768px) {
  .dashboard-grid .col-span-3 {
    grid-column: span 3;
  }
}

@media (min-width: 1200px) {
  .dashboard-grid .col-span-3 {
    grid-column: span 3;
  }
}

.dashboard-grid .col-span-4 {
  grid-column: span 1;
}

@media (min-width: 1200px) {
  .dashboard-grid .col-span-4 {
    grid-column: span 4;
  }
}

.dashboard-grid .col-span-6 {
  grid-column: span 1;
}

@media (min-width: 768px) {
  .dashboard-grid .col-span-6 {
    grid-column: span 6;
  }
}

.dashboard-grid .col-span-8 {
  grid-column: span 1;
}

@media (min-width: 1200px) {
  .dashboard-grid .col-span-8 {
    grid-column: span 8;
  }
}

/* Sidebar nav notification badge */
.sidebar-nav .badge.rounded-pill {
  margin-left: auto;
  background: hsl(var(--primary)) !important;
  font-size: 0.65rem;
  font-weight: 600;
}

/* Unread message sidebar badge override */
.nav-link .badge.rounded-pill {
  font-size: 0.65rem;
}

/* Course detail page */
.course-detail-header {
  height: 200px;
  border-radius: 8px 8px 0 0;
  background: linear-gradient(135deg, hsl(var(--primary) / 0.24), hsl(var(--accent) / 0.18));
  display: flex;
  align-items: center;
  justify-content: center;
  font-size: 3rem;
  color: hsl(var(--primary));
  overflow: hidden;
}

.course-detail-header img {
  width: 100%;
  height: 100%;
  object-fit: cover;
}

/* Page heading component */
.page-heading {
  display: flex;
  flex-direction: column;
  gap: 0.5rem;
  padding-bottom: 2rem;
}

.page-heading h1 {
  font-size: 2.5rem;
  font-weight: 600;
  letter-spacing: -0.02em;
  color: hsl(var(--foreground));
}

.page-heading p {
  font-size: 1rem;
  color: hsl(var(--muted-foreground));
  line-height: 1.75;
}

/* Sidebar gradient footer widget */
.sidebar-widget {
  border-radius: 8px;
  border: 1px solid hsl(var(--primary) / 0.15);
  background: linear-gradient(135deg, hsl(178 84% 43% / 0.04), hsl(252 89% 70% / 0.04));
  padding: 1rem;
  margin: 0 0.75rem 1rem;
}

.sidebar-widget h6 {
  font-size: 0.8125rem;
  font-weight: 600;
  color: hsl(var(--foreground));
  margin-bottom: 0.25rem;
}

.sidebar-widget p {
  font-size: 0.75rem;
  color: hsl(var(--muted-foreground));
  margin-bottom: 0.5rem;
}

.sidebar-widget .btn {
  font-size: 0.75rem;
  height: 28px;
  padding: 0 0.5rem;
}

/* Video container */
.video-container {
  position: relative;
  width: 100%;
  background: #000;
  display: flex;
  align-items: center;
  justify-content: center;
}

.video-container video {
  display: block;
  max-width: 100%;
  max-height: 540px;
  width: 100%;
  height: auto;
}

.video-container video::-webkit-media-controls {
  z-index: 1;
}