/* ===== Modern Learning Platform - Design System ===== */

:root {
  /* Primary Colors - Premium Gold & Dark Blue Theme */
  --primary: #D4AF37;
  --primary-dark: #996515;
  --primary-light: #F9E076;
  --primary-lighter: #FFF9E3;

  /* Secondary - Sidebar */
  --sidebar-bg: #0f172a;
  --sidebar-border: #1e293b;
  --sidebar-text: #94a3b8;
  --sidebar-text-active: #D4AF37;
  --sidebar-bg-active: rgba(212, 175, 55, 0.1);

  /* Accent Colors */
  --accent: #D4AF37;
  --success: #10b981;
  --warning: #f59e0b;
  --danger: #ef4444;
  --info: #3b82f6;

  /* Neutral Colors - Dark Theme Only */
  --white: #1e293b;
  --bg-body: #0f172a;
  --bg-card: #1e293b;
  --text-main: #f8fafc;
  --text-muted: #94a3b8;
  --border-color: #334155;

  --gray-50: #0f172a;
  --gray-100: #1e293b;
  --gray-200: #334155;
  --gray-300: #475569;
  --gray-400: #64748b;
  --gray-500: #94a3b8;
  --gray-600: #cbd5e1;
  --gray-700: #e2e8f0;
  --gray-800: #f1f5f9;
  --gray-900: #f8fafc;

  /* Glassmorphism */
  --glass-bg: rgba(255, 255, 255, 0.05);
  --glass-border: rgba(255, 255, 255, 0.1);
  --glass-blur: blur(12px);

  /* Typography */
  --font-family: 'Inter', -apple-system, BlinkMacSystemFont, 'Segoe UI', sans-serif;
  --font-mono: 'Fira Code', 'JetBrains Mono', 'Courier New', monospace;

  --font-size-xs: 0.75rem;
  --font-size-sm: 0.875rem;
  --font-size-base: 1rem;
  --font-size-lg: 1.125rem;
  --font-size-xl: 1.25rem;
  --font-size-2xl: 1.5rem;
  --font-size-3xl: 1.875rem;
  --font-size-4xl: 2.25rem;
  --font-size-5xl: 3rem;

  /* Spacing */
  --spacing-xs: 0.25rem;
  --spacing-sm: 0.5rem;
  --spacing-md: 1rem;
  --spacing-lg: 1.5rem;
  --spacing-xl: 2rem;
  --spacing-2xl: 2.5rem;
  --spacing-3xl: 3rem;
  --spacing-4xl: 4rem;

  /* Border Radius */
  --radius-sm: 0.375rem;
  --radius-md: 0.5rem;
  --radius-lg: 0.75rem;
  --radius-xl: 1rem;
  --radius-2xl: 1.5rem;
  --radius-full: 9999px;

  /* Shadows */
  --shadow-xs: 0 1px 2px 0 rgba(0, 0, 0, 0.05);
  --shadow-sm: 0 1px 3px 0 rgba(0, 0, 0, 0.1), 0 1px 2px 0 rgba(0, 0, 0, 0.06);
  --shadow-md: 0 4px 6px -1px rgba(0, 0, 0, 0.1), 0 2px 4px -1px rgba(0, 0, 0, 0.06);
  --shadow-lg: 0 10px 15px -3px rgba(0, 0, 0, 0.1), 0 4px 6px -2px rgba(0, 0, 0, 0.05);
  --shadow-xl: 0 20px 25px -5px rgba(0, 0, 0, 0.1), 0 10px 10px -5px rgba(0, 0, 0, 0.04);
  --shadow-2xl: 0 25px 50px -12px rgba(0, 0, 0, 0.25);

  /* Transitions */
  --transition-fast: 150ms cubic-bezier(0.4, 0, 0.2, 1);
  --transition-base: 250ms cubic-bezier(0.4, 0, 0.2, 1);
  --transition-slow: 350ms cubic-bezier(0.4, 0, 0.2, 1);

  /* Layout */
  --sidebar-width: 280px;
  --sidebar-collapsed-width: 88px;
  --header-height: 70px;
}

/* ===== Reset & Base ===== */
* {
  margin: 0;
  padding: 0;
  box-sizing: border-box;
}

body {
  font-family: var(--font-family);
  font-size: var(--font-size-base);
  line-height: 1.6;
  color: var(--text-main);
  background-color: var(--bg-body);
  min-height: 100vh;
  overflow-x: hidden;
  transition: background-color 0.3s ease, color 0.3s ease;
}

main {
  flex: 1;
}

/* ===== Sidebar Layout ===== */
.app-wrapper {
  display: flex;
  min-height: 100vh;
}

.sidebar {
  position: fixed;
  left: var(--spacing-md);
  top: var(--spacing-md);
  bottom: var(--spacing-md);
  width: var(--sidebar-width);
  background: var(--sidebar-bg);
  padding: var(--spacing-lg);
  display: flex;
  flex-direction: column;
  z-index: 1000;
  border-radius: var(--radius-2xl);
  border: 1px solid var(--sidebar-border);
  box-shadow: var(--shadow-xl);
  transition: all 0.4s cubic-bezier(0.4, 0, 0.2, 1);
}

.sidebar.collapsed {
  width: var(--sidebar-collapsed-width);
  padding: var(--spacing-lg) var(--spacing-md);
}

.sidebar.collapsed .brand-text,
.sidebar.collapsed .nav-link span:not(.material-icons),
.sidebar.collapsed .user-info,
.sidebar.collapsed .user-profile a,
.sidebar.collapsed .search-box input {
  display: none;
}

.sidebar.collapsed .brand {
  justify-content: center;
  padding: var(--spacing-md);
}

.sidebar.collapsed .nav-link {
  justify-content: center;
  padding: var(--spacing-md);
  width: 48px;
  height: 48px;
  margin: 0 auto;
}

.sidebar.collapsed .nav-menu ul {
  align-items: center;
}

.sidebar.collapsed .search-box {
  display: none;
}

.sidebar-toggle {
  position: absolute;
  right: -16px;
  top: 44px;
  width: 32px;
  height: 32px;
  background: linear-gradient(135deg, var(--primary) 0%, var(--primary-dark) 100%);
  color: #0f172a;
  border-radius: 10px;
  display: flex;
  align-items: center;
  justify-content: center;
  cursor: pointer;
  z-index: 1001;
  border: 3px solid var(--sidebar-bg);
  box-shadow: var(--shadow-lg);
  transition: all 0.4s cubic-bezier(0.175, 0.885, 0.32, 1.275);
}

.sidebar-toggle:hover {
  transform: scale(1.1);
  box-shadow: 0 0 15px rgba(212, 175, 55, 0.4);
}

.sidebar.collapsed .sidebar-toggle {
  transform: rotate(180deg);
}

.sidebar.collapsed .sidebar-toggle:hover {
  transform: rotate(180deg) scale(1.1);
}

.sidebar-header {
  display: flex;
  flex-direction: column;
  gap: var(--spacing-lg);
  margin-bottom: var(--spacing-2xl);
}

.brand {
  display: flex;
  align-items: center;
  gap: var(--spacing-md);
  padding: var(--spacing-md);
  background: transparent;
  border-radius: var(--radius-xl);
  color: var(--text-main);
  text-decoration: none;
}

.brand-icon {
  width: 40px;
  height: 40px;
  background: #D4AF37;
  border-radius: var(--radius-md);
  display: flex;
  align-items: center;
  justify-content: center;
  color: #0f172a;
  flex-shrink: 0;
}

.brand-icon .material-icons {
  font-size: 24px;
}

.brand-text {
  font-size: var(--font-size-xl);
  font-weight: 700;
  letter-spacing: -0.025em;
}

.search-box {
  position: relative;
}

.search-box input {
  width: 100%;
  padding: var(--spacing-sm) var(--spacing-md) var(--spacing-sm) var(--spacing-3xl);
  background: var(--gray-100);
  border: 1px solid var(--border-color);
  border-radius: var(--radius-lg);
  color: var(--text-main);
  font-size: var(--font-size-sm);
  transition: all var(--transition-base);
}

.search-box input::placeholder {
  color: var(--text-muted);
}

.search-box input:focus {
  outline: none;
  background: var(--bg-card);
  border-color: var(--primary);
  box-shadow: 0 0 0 4px var(--primary-light);
}

.search-box .material-icons {
  position: absolute;
  left: var(--spacing-md);
  top: 50%;
  transform: translateY(-50%);
  color: var(--text-muted);
  font-size: 20px;
}

.nav-menu {
  flex: 1;
  overflow-y: auto;
}

.nav-menu ul {
  list-style: none;
  display: flex;
  flex-direction: column;
  gap: var(--spacing-xs);
}

.nav-link {
  display: flex;
  align-items: center;
  gap: var(--spacing-md);
  padding: var(--spacing-md) var(--spacing-lg);
  color: var(--sidebar-text);
  text-decoration: none;
  border-radius: var(--radius-lg);
  transition: all var(--transition-base);
  font-weight: 500;
  font-size: var(--font-size-sm);
}

.nav-link:hover {
  background: var(--sidebar-bg-active);
  color: var(--sidebar-text-active);
}

.nav-link.active {
  background: var(--sidebar-bg-active);
  color: var(--sidebar-text-active);
}

.nav-link .material-icons {
  font-size: 20px;
}

.sidebar-footer {
  padding-top: var(--spacing-lg);
  border-top: 1px solid var(--sidebar-border);
}

.user-profile {
  display: flex;
  align-items: center;
  gap: var(--spacing-md);
  padding: var(--spacing-md);
  background: var(--gray-100);
  border-radius: var(--radius-lg);
  color: var(--text-main);
  cursor: pointer;
  transition: all var(--transition-base);
  border: 1px solid var(--border-color);
}

.user-profile:hover {
  background: var(--gray-200);
}

.sidebar.collapsed .user-profile {
  padding: 0;
  background: transparent;
  border: none;
  justify-content: center;
}

.sidebar.collapsed .user-avatar {
  margin: 0 auto;
}

.user-avatar {
  width: 40px;
  height: 40px;
  border-radius: var(--radius-full);
  background: #D4AF37;
  display: flex;
  align-items: center;
  justify-content: center;
  font-weight: 600;
  color: #0f172a;
  flex-shrink: 0;
}

.user-info {
  flex: 1;
}

.user-name {
  font-size: var(--font-size-sm);
  font-weight: 600;
  display: block;
}

.user-role {
  font-size: var(--font-size-xs);
  color: var(--text-muted);
}

/* ===== Main Content Area ===== */
.main-content {
  margin-left: calc(var(--sidebar-width) + var(--spacing-md) * 2);
  flex: 1;
  min-height: 100vh;
  padding: var(--spacing-md);
  transition: margin-left 0.4s cubic-bezier(0.4, 0, 0.2, 1);
}

.sidebar.collapsed+.main-content {
  margin-left: calc(var(--sidebar-collapsed-width) + var(--spacing-md) * 2);
}

.top-bar {
  height: var(--header-height);
  background: var(--glass-bg);
  backdrop-filter: var(--glass-blur);
  -webkit-backdrop-filter: var(--glass-blur);
  border: 1px solid var(--glass-border);
  border-radius: var(--radius-xl);
  display: flex;
  align-items: center;
  justify-content: space-between;
  padding: 0 var(--spacing-xl);
  position: sticky;
  top: var(--spacing-md);
  z-index: 100;
  box-shadow: var(--shadow-md);
  margin-bottom: var(--spacing-xl);
  transition: all 0.3s ease;
}

.page-title {
  font-size: var(--font-size-2xl);
  font-weight: 700;
  color: var(--text-main);
}

.top-bar-actions {
  display: flex;
  align-items: center;
  gap: var(--spacing-lg);
}

.notification-btn {
  position: relative;
  width: 40px;
  height: 40px;
  background: var(--gray-100);
  border: none;
  border-radius: var(--radius-full);
  display: flex;
  align-items: center;
  justify-content: center;
  cursor: pointer;
  transition: all var(--transition-base);
}

.notification-btn .material-icons {
  color: white;
}

.notification-btn:hover {
  background: var(--gray-200);
}

.notification-badge {
  position: absolute;
  top: 0;
  right: 0;
  width: 18px;
  height: 18px;
  background: var(--danger);
  border: 2px solid var(--white);
  border-radius: var(--radius-full);
  font-size: 10px;
  color: var(--white);
  display: flex;
  align-items: center;
  justify-content: center;
  font-weight: 600;
}

/* ===== Container ===== */
.container {
  max-width: 1400px;
  margin: 0 auto;
  padding: var(--spacing-2xl);
}

/* ===== Cards ===== */
.card {
  background: var(--bg-card);
  border-radius: var(--radius-2xl);
  box-shadow: var(--shadow-md);
  overflow: hidden;
  transition: all var(--transition-base);
  border: 1px solid var(--border-color);
  width: 100%;
}

/* Premium Course Card (Glassmorphism) */
.premium-card {
  background: rgba(30, 41, 59, 0.5);
  backdrop-filter: blur(10px);
  -webkit-backdrop-filter: blur(10px);
  border: 1px solid var(--border-color);
  border-radius: 24px;
  overflow: hidden;
  transition: all 0.4s cubic-bezier(0.4, 0, 0.2, 1);
  position: relative;
  height: 100%;
  display: flex;
  flex-direction: column;
  width: 100%;
}

.premium-card:hover {
  transform: translateY(-8px);
  box-shadow: 0 20px 40px rgba(0, 0, 0, 0.1);
  border-color: rgba(212, 175, 55, 0.4);
}

.premium-card .card-image-wrap {
  position: relative;
  height: 200px;
  overflow: hidden;
}

.premium-card .card-img {
  width: 100%;
  height: 100%;
  object-fit: cover;
  transition: transform 0.6s ease;
}

.premium-card:hover .card-img {
  transform: scale(1.1);
}

.premium-card .badge-bestseller {
  position: absolute;
  top: 16px;
  left: 16px;
  background: white;
  color: black;
  padding: 4px 12px;
  border-radius: 8px;
  font-size: 12px;
  font-weight: 700;
  z-index: 2;
  box-shadow: 0 4px 12px rgba(0, 0, 0, 0.1);
}

.premium-card .student-avatars {
  position: absolute;
  bottom: -12px;
  right: 16px;
  display: flex;
  align-items: center;
  z-index: 3;
}

.premium-card .avatar-stack {
  width: 32px;
  height: 32px;
  border-radius: 50%;
  border: 2px solid var(--bg-card);
  margin-left: -12px;
  object-fit: cover;
  background: var(--gray-200);
}

.premium-card .avatar-stack:first-child {
  margin-left: 0;
}

.premium-card .card-content {
  padding: 24px;
  flex: 1;
  display: flex;
  flex-direction: column;
}

.premium-card .category-badge {
  display: inline-block;
  padding: 4px 12px;
  background: var(--gray-200);
  border-radius: 8px;
  font-size: 12px;
  font-weight: 700;
  color: var(--gray-700);
  margin-bottom: 12px;
  width: fit-content;
  text-transform: uppercase;
  letter-spacing: 0.025em;
}

.dark-mode .premium-card .category-badge {
  background: #334155;
  color: #f1f5f9;
}

.premium-card .card-title {
  font-size: 20px;
  font-weight: 700;
  color: var(--text-main);
  margin-bottom: 12px;
  line-height: 1.4;
}

.premium-card .rating-wrap {
  display: flex;
  align-items: center;
  gap: 8px;
  margin-bottom: 24px;
}

.premium-card .rating-text {
  font-size: 14px;
  color: var(--text-muted);
  font-weight: 500;
}

.premium-card .stars {
  display: flex;
  color: #f59e0b;
}

.premium-card .stars .material-icons {
  font-size: 16px;
}

.premium-card .card-footer {
  display: flex;
  align-items: center;
  justify-content: space-between;
  margin-top: auto;
  padding-top: 20px;
  border-top: 1px solid var(--border-color);
}

.premium-card .price-wrap {
  display: flex;
  align-items: baseline;
  gap: 8px;
}

.premium-card .current-price {
  font-size: 24px;
  font-weight: 800;
  color: var(--text-main);
}

.premium-card .old-price {
  font-size: 14px;
  color: var(--text-muted);
  text-decoration: line-through;
}

.premium-card .lesson-count {
  display: flex;
  align-items: center;
  gap: 6px;
  font-size: 14px;
  color: var(--text-muted);
  font-weight: 500;
}

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

.card-img {
  width: 100%;
  height: 220px;
  object-fit: cover;
  background: linear-gradient(135deg, var(--primary-light) 0%, var(--gray-100) 100%);
}

.card-body {
  padding: var(--spacing-xl);
}

.card-title {
  font-size: var(--font-size-xl);
  font-weight: 700;
  margin-bottom: var(--spacing-sm);
  color: var(--gray-900);
  line-height: 1.3;
}

.card-text {
  color: var(--gray-600);
  margin-bottom: var(--spacing-lg);
  line-height: 1.6;
}

.card-footer {
  display: flex;
  justify-content: space-between;
  align-items: center;
  padding-top: var(--spacing-lg);
  border-top: 1px solid var(--gray-200);
}

/* ===== Buttons ===== */
.btn {
  display: inline-flex;
  align-items: center;
  gap: var(--spacing-sm);
  padding: var(--spacing-md) var(--spacing-xl);
  border: none;
  border-radius: var(--radius-lg);
  font-weight: 600;
  font-size: var(--font-size-sm);
  cursor: pointer;
  text-decoration: none;
  transition: all var(--transition-base);
  white-space: nowrap;
  justify-content: center;
  text-rendering: optimizeLegibility;
  -webkit-font-smoothing: antialiased;
}

.btn-primary {
  background: linear-gradient(135deg, var(--primary) 0%, var(--primary-light) 100%);
  color: #0f172a;
  box-shadow: 0 4px 12px rgba(212, 175, 55, 0.3);
}

.btn-primary:hover {
  background: linear-gradient(135deg, var(--primary-dark) 0%, var(--primary) 100%);
  transform: translateY(-2px);
  box-shadow: 0 6px 20px rgba(212, 175, 55, 0.4);
}

.btn-secondary {
  background: var(--gray-200);
  color: var(--gray-800);
}

.btn-secondary:hover {
  background: var(--gray-300);
  transform: translateY(-2px);
}

.btn-success {
  background: var(--success);
  color: var(--white);
}

.btn-success:hover {
  background: #2CB87D;
  transform: translateY(-2px);
}

.btn-lg {
  padding: var(--spacing-lg) var(--spacing-2xl);
  font-size: var(--font-size-base);
}

.btn-sm {
  padding: var(--spacing-sm) var(--spacing-md);
  font-size: var(--font-size-xs);
}

/* ===== Grid System ===== */
.grid {
  display: grid;
  gap: var(--spacing-2xl);
}

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

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

.grid-4 {
  grid-template-columns: repeat(4, 1fr);
}

/* ===== Badges ===== */
.badge {
  display: inline-flex;
  align-items: center;
  gap: var(--spacing-xs);
  padding: var(--spacing-xs) var(--spacing-md);
  border-radius: var(--radius-full);
  font-size: var(--font-size-xs);
  font-weight: 600;
}

.badge-primary {
  background: rgba(99, 102, 241, 0.1);
  color: var(--primary);
}

.badge-success {
  background: rgba(16, 185, 129, 0.1);
  color: var(--success);
}

.badge-warning {
  background: rgba(245, 158, 11, 0.1);
  color: var(--warning);
}

.badge-info {
  background: rgba(59, 130, 246, 0.1);
  color: var(--info);
}

/* ===== Statistics Cards ===== */
.stat-card {
  background: var(--bg-card);
  padding: var(--spacing-xl);
  border-radius: var(--radius-2xl);
  display: flex;
  align-items: center;
  gap: var(--spacing-lg);
  box-shadow: var(--shadow-md);
  transition: all var(--transition-base);
  border: 1px solid var(--border-color);
  width: 100%;
}

.stat-card:hover {
  transform: translateY(-4px);
  box-shadow: var(--shadow-xl);
  border-color: var(--primary);
}

.stat-icon {
  width: 64px;
  height: 64px;
  border-radius: var(--radius-xl);
  display: flex;
  align-items: center;
  justify-content: center;
  font-size: 28px;
  flex-shrink: 0;
}

.stat-icon.orange {
  background: rgba(212, 175, 55, 0.15);
  color: #D4AF37;
}

.stat-icon.green {
  background: rgba(16, 185, 129, 0.15);
  color: #10b981;
}

.stat-icon.blue {
  background: rgba(59, 130, 246, 0.15);
  color: #3b82f6;
}

.stat-icon.purple {
  background: rgba(167, 139, 250, 0.15);
  color: #a78bfa;
}

.stat-info h3 {
  font-size: var(--font-size-3xl);
  font-weight: 800;
  color: var(--gray-900);
  margin-bottom: var(--spacing-xs);
}

.stat-info p {
  color: var(--gray-600);
  font-size: var(--font-size-sm);
  font-weight: 500;
}

.stat-change {
  font-size: var(--font-size-xs);
  color: var(--success);
  font-weight: 600;
  margin-top: var(--spacing-xs);
}

.stat-change.negative {
  color: var(--danger);
}

/* ===== Forms ===== */
.form-group {
  margin-bottom: var(--spacing-lg);
}

.form-label {
  display: block;
  margin-bottom: var(--spacing-sm);
  font-weight: 600;
  color: var(--gray-700);
  font-size: var(--font-size-sm);
}

.form-input,
.form-select,
.form-textarea {
  width: 100%;
  padding: var(--spacing-md) var(--spacing-lg);
  border: 2px solid var(--gray-300);
  border-radius: var(--radius-lg);
  font-size: var(--font-size-base);
  font-family: var(--font-family);
  transition: all var(--transition-base);
  background: var(--white);
}

.form-input:focus,
.form-select:focus,
.form-textarea:focus {
  outline: none;
  border-color: var(--primary);
  box-shadow: 0 0 0 4px var(--primary-lighter);
}

.form-textarea {
  min-height: 120px;
  resize: vertical;
}

/* ===== Messages ===== */
.messages-container {
  position: fixed;
  top: var(--spacing-xl);
  right: var(--spacing-xl);
  z-index: 2000;
  max-width: 400px;
}

.message {
  display: flex;
  align-items: center;
  gap: var(--spacing-md);
  padding: var(--spacing-lg);
  margin-bottom: var(--spacing-md);
  border-radius: var(--radius-xl);
  box-shadow: var(--shadow-xl);
  animation: slideIn var(--transition-base);
  background: var(--white);
  border-left: 4px solid;
}

@keyframes slideIn {
  from {
    transform: translateX(400px);
    opacity: 0;
  }

  to {
    transform: translateX(0);
    opacity: 1;
  }
}

.message-success {
  border-color: var(--success);
  color: #065F46;
}

.message-error {
  border-color: var(--danger);
  color: #991B1B;
}

.message-warning {
  border-color: var(--warning);
  color: #92400E;
}

.message-info {
  border-color: var(--info);
  color: #1E40AF;
}

/* ===== Price Tag ===== */
.price {
  font-size: var(--font-size-2xl);
  font-weight: 800;
  color: var(--primary);
}

/* ===== Hero Section ===== */
.hero {
  background: linear-gradient(135deg, var(--sidebar-bg) 0%, var(--sidebar-light) 100%);
  color: var(--white);
  padding: var(--spacing-4xl) var(--spacing-2xl);
  text-align: center;
  border-radius: var(--radius-2xl);
  margin: var(--spacing-xl) 0;
  position: relative;
  overflow: hidden;
}

.hero::before {
  content: '';
  position: absolute;
  top: 0;
  left: 0;
  right: 0;
  bottom: 0;
  background: radial-gradient(circle at top right, rgba(255, 107, 53, 0.3), transparent 50%);
  pointer-events: none;
}

.hero-content {
  position: relative;
  z-index: 1;
}

.hero-title {
  font-size: var(--font-size-5xl);
  font-weight: 800;
  margin-bottom: var(--spacing-lg);
  line-height: 1.1;
}

.hero-subtitle {
  font-size: var(--font-size-xl);
  opacity: 0.9;
  max-width: 700px;
  margin: 0 auto var(--spacing-2xl);
  line-height: 1.6;
}

/* ===== Footer ===== */
.footer {
  background: var(--bg-card);
  border-top: 1px solid var(--border-color);
  padding: var(--spacing-2xl) 0;
  margin-top: var(--spacing-4xl);
  text-align: center;
  color: var(--text-muted);
  transition: background-color 0.3s ease, border-color 0.3s ease;
}

/* ===== Utilities ===== */
.text-center {
  text-align: center;
}

.mt-1 {
  margin-top: var(--spacing-sm);
}

.mt-2 {
  margin-top: var(--spacing-md);
}

.mt-3 {
  margin-top: var(--spacing-lg);
}

.mt-4 {
  margin-top: var(--spacing-xl);
}

.mb-1 {
  margin-bottom: var(--spacing-sm);
}

.mb-2 {
  margin-bottom: var(--spacing-md);
}

.mb-3 {
  margin-bottom: var(--spacing-lg);
}

.mb-4 {
  margin-bottom: var(--spacing-xl);
}

.py-4 {
  padding-top: var(--spacing-xl);
  padding-bottom: var(--spacing-xl);
}

.py-5 {
  padding-top: var(--spacing-2xl);
  padding-bottom: var(--spacing-2xl);
}

/* ===== Responsive ===== */
@media (max-width: 1024px) {
  .sidebar {
    transform: translateX(-100%);
    border-radius: 0;
  }

  .main-content {
    margin-left: 0;
  }

  .grid-2,
  .grid-3,
  .grid-4 {
    grid-template-columns: 1fr;
  }
}

@media (max-width: 768px) {
  .hero-title {
    font-size: var(--font-size-3xl);
  }

  .container {
    padding: var(--spacing-lg);
  }
}

/* ===== Dashboard Specific ===== */
.dashboard-section {
  margin-bottom: var(--spacing-4xl);
}

.section-header-flex {
  display: flex;
  align-items: center;
  justify-content: space-between;
  margin-bottom: var(--spacing-xl);
}

.section-header-flex h2 {
  font-size: var(--font-size-2xl);
  font-weight: 700;
  color: var(--text-main);
}

.progress-container {
  width: 100%;
  height: 8px;
  background: var(--gray-100);
  border-radius: var(--radius-full);
  overflow: hidden;
  margin: var(--spacing-md) 0;
}

.progress-bar {
  height: 100%;
  background: var(--primary);
  border-radius: var(--radius-full);
  transition: width 0.5s ease;
}

.course-card-horizontal {
  display: flex;
  flex-wrap: wrap;
  gap: var(--spacing-lg);
  background: var(--bg-card);
  border-radius: var(--radius-xl);
  padding: var(--spacing-lg);
  border: 1px solid var(--border-color);
  transition: all var(--transition-base);
  text-decoration: none;
  color: inherit;
  min-height: 140px;
  width: 100%;
}

.course-card-horizontal:hover {
  transform: translateY(-4px);
  box-shadow: var(--shadow-lg);
  border-color: var(--primary-light);
}

.course-card-horizontal .course-img {
  width: 100px;
  height: 100px;
  border-radius: var(--radius-lg);
  object-fit: cover;
  flex-shrink: 0;
}

.course-card-horizontal .course-content {
  flex: 1;
  display: flex;
  flex-direction: column;
  justify-content: center;
}

.course-card-horizontal .course-title {
  font-size: var(--font-size-lg);
  font-weight: 700;
  margin-bottom: var(--spacing-xs);
  color: var(--text-main);
}

.course-card-horizontal .course-meta {
  font-size: var(--font-size-sm);
  color: var(--text-muted);
  display: flex;
  align-items: center;
  gap: var(--spacing-md);
}


.stat-icon {
  width: 56px;
  height: 56px;
  border-radius: var(--radius-lg);
  display: flex;
  align-items: center;
  justify-content: center;
  flex-shrink: 0;
}

.stat-info h3 {
  font-size: var(--font-size-2xl);
  font-weight: 800;
  color: var(--text-main);
  margin: 0;
}

.stat-info p {
  font-size: var(--font-size-sm);
  color: var(--text-muted);
  margin: 0;
}

/* ===== Course Detail & Viewer Components ===== */

.course-header-grid {
  display: grid;
  grid-template-columns: 1fr 380px;
  gap: var(--spacing-3xl);
  align-items: start;
}

.course-title {
  font-size: var(--font-size-4xl);
  font-weight: 800;
  color: var(--text-main);
  letter-spacing: -0.025em;
  margin-bottom: var(--spacing-md);
}

.course-description {
  font-size: var(--font-size-lg);
  color: var(--text-muted);
  line-height: 1.6;
  margin-bottom: var(--spacing-2xl);
}

.badge-group {
  display: flex;
  flex-wrap: wrap;
  gap: var(--spacing-sm);
  margin-bottom: var(--spacing-lg);
}

.badge-premium {
  background: var(--bg-card);
  color: var(--primary);
  padding: var(--spacing-xs) var(--spacing-md);
  border-radius: var(--radius-full);
  font-weight: 600;
  display: inline-flex;
  align-items: center;
  gap: var(--spacing-xs);
  box-shadow: var(--shadow-sm);
  border: 1px solid var(--border-color);
}

.badge-success-premium {
  background: #ecfdf5;
  color: #059669;
  padding: var(--spacing-xs) var(--spacing-md);
  border-radius: var(--radius-full);
  font-weight: 600;
  display: inline-flex;
  align-items: center;
  gap: var(--spacing-xs);
}

.dark-mode .badge-success-premium {
  background: rgba(16, 185, 129, 0.1);
  color: #10b981;
}

.content-card {
  background: var(--bg-card);
  border-radius: var(--radius-2xl);
  padding: var(--spacing-2xl);
  box-shadow: var(--shadow-lg);
  border: 1px solid var(--border-color);
  margin-bottom: var(--spacing-xl);
}

.card-header-premium {
  display: flex;
  align-items: center;
  gap: var(--spacing-md);
  margin-bottom: var(--spacing-xl);
}

.card-header-premium h2 {
  font-size: var(--font-size-xl);
  font-weight: 700;
  margin: 0;
  color: var(--text-main);
}

.card-header-premium .material-icons {
  color: var(--primary);
  font-size: 2rem;
}

.module-list-premium {
  display: flex;
  flex-direction: column;
  gap: var(--spacing-md);
}

.module-item-premium {
  display: flex;
  align-items: center;
  gap: var(--spacing-lg);
  padding: var(--spacing-lg);
  background: var(--gray-50);
  border-radius: var(--radius-xl);
  transition: all var(--transition-base);
  border: 1px solid var(--border-color);
  text-decoration: none;
}

.module-item-premium:hover {
  transform: translateX(8px);
  background: var(--gray-100);
  border-color: var(--primary);
}

.module-icon {
  width: 48px;
  height: 48px;
  background: var(--bg-card);
  border-radius: var(--radius-lg);
  display: flex;
  align-items: center;
  justify-content: center;
  color: var(--primary);
  box-shadow: var(--shadow-sm);
  border: 1px solid var(--border-color);
}

.module-details {
  flex: 1;
}

.module-title-row {
  display: flex;
  align-items: center;
  gap: var(--spacing-md);
}

.module-title {
  font-weight: 600;
  color: var(--text-main);
}

.badge-preview {
  background: var(--primary);
  color: var(--white);
  font-size: var(--font-size-xs);
  padding: 2px 8px;
  border-radius: var(--radius-full);
}

.btn-preview {
  display: flex;
  align-items: center;
  gap: var(--spacing-xs);
  padding: var(--spacing-sm) var(--spacing-md);
  background: transparent;
  color: var(--primary);
  border-radius: var(--radius-md);
  font-weight: 600;
  text-decoration: none;
  font-size: var(--font-size-sm);
  border: 1px solid var(--primary);
  transition: all var(--transition-fast);
  text-rendering: optimizeLegibility;
  -webkit-font-smoothing: antialiased;
}

.btn-preview:hover {
  background: rgba(212, 175, 55, 0.1);
  transform: translateY(-2px);
  box-shadow: 0 4px 12px rgba(212, 175, 55, 0.15);
}

/* Enrollment Sidebar */
.enrollment-card-premium {
  background: var(--bg-card);
  border-radius: var(--radius-2xl);
  overflow: hidden;
  position: sticky;
  top: calc(var(--header-height) + var(--spacing-2xl));
  box-shadow: var(--shadow-2xl);
  border: 1px solid var(--border-color);
}

.thumbnail-container {
  position: relative;
  height: 220px;
}

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

.thumbnail-placeholder {
  height: 220px;
  background: linear-gradient(135deg, var(--primary) 0%, var(--primary-light) 100%);
  display: flex;
  align-items: center;
  justify-content: center;
  color: var(--white);
}

.thumbnail-placeholder .material-icons {
  font-size: 4rem;
}

.card-body-premium {
  padding: var(--spacing-xl);
}

.price-tag {
  font-size: var(--font-size-3xl);
  font-weight: 800;
  color: var(--text-main);
  margin-bottom: var(--spacing-lg);
}

.btn-primary-premium {
  background: var(--primary);
  color: #0f172a;
  padding: var(--spacing-lg);
  border-radius: var(--radius-lg);
  font-weight: 600;
  display: flex;
  align-items: center;
  justify-content: center;
  gap: var(--spacing-sm);
  text-decoration: none;
  transition: all var(--transition-base);
  border: none;
  width: 100%;
  text-rendering: optimizeLegibility;
  -webkit-font-smoothing: antialiased;
}

.btn-primary-premium:hover {
  background: var(--primary-dark);
  color: #0f172a;
  transform: translateY(-2px);
  box-shadow: 0 10px 20px -5px rgba(212, 175, 55, 0.4);
}

.btn-outline-premium {
  background: transparent;
  color: var(--primary);
  border: 2px solid var(--primary);
  padding: var(--spacing-md);
  border-radius: var(--radius-lg);
  font-weight: 700;
  display: flex;
  align-items: center;
  justify-content: center;
  gap: var(--spacing-sm);
  text-decoration: none;
  transition: all var(--transition-base);
  width: 100%;
}

.btn-outline-premium:hover {
  background: var(--primary-light);
}

/* Progress Bar */
.progress-card {
  background: var(--gray-50);
  padding: var(--spacing-lg);
  border-radius: var(--radius-xl);
  border: 1px solid var(--border-color);
}

.progress-header {
  display: flex;
  justify-content: space-between;
  font-weight: 700;
  color: var(--text-main);
  margin-bottom: var(--spacing-sm);
}

.progress-bar-container {
  height: 10px;
  background: var(--gray-200);
  border-radius: var(--radius-full);
  overflow: hidden;
}

.progress-bar-fill {
  height: 100%;
  background: linear-gradient(to right, var(--primary), var(--primary-light));
  border-radius: var(--radius-full);
  transition: width 1s cubic-bezier(0.4, 0, 0.2, 1);
  width: var(--progress, 0%);
}

/* Viewer Specific */
.viewer-container {
  display: flex;
  height: calc(100vh - var(--header-height) - var(--spacing-md) * 3);
  gap: var(--spacing-lg);
}

.viewer-sidebar {
  width: 340px;
  background: var(--bg-card);
  border-radius: var(--radius-2xl);
  border: 1px solid var(--border-color);
  display: flex;
  flex-direction: column;
  overflow: hidden;
  box-shadow: var(--shadow-lg);
}

.viewer-main {
  flex: 1;
  background: var(--bg-card);
  border-radius: var(--radius-2xl);
  border: 1px solid var(--border-color);
  overflow-y: auto;
  padding: var(--spacing-2xl);
  box-shadow: var(--shadow-lg);
}

/* Rich Content */
.rich-content {
  font-size: 1.1rem;
  line-height: 1.8;
  color: var(--text-main);
}

.rich-content h1,
.rich-content h2,
.rich-content h3 {
  color: var(--text-main);
  margin-top: 2rem;
  margin-bottom: 1rem;
  font-weight: 800;
}

.rich-content p {
  margin-bottom: 1.5rem;
}

.rich-content img {
  max-width: 100%;
  border-radius: var(--radius-xl);
  margin: 2rem 0;
}

/* Table Styles (Mentor Panel) */
.premium-table {
  width: 100%;
  border-collapse: separate;
  border-spacing: 0;
  margin: var(--spacing-lg) 0;
}

.premium-table th {
  background: var(--gray-50);
  padding: var(--spacing-md) var(--spacing-lg);
  text-align: left;
  font-weight: 700;
  color: var(--text-muted);
  text-transform: uppercase;
  font-size: var(--font-size-xs);
  letter-spacing: 0.05em;
  border-bottom: 1px solid var(--border-color);
}

.premium-table td {
  padding: var(--spacing-lg);
  border-bottom: 1px solid var(--border-color);
  color: var(--text-main);
  transition: background-color var(--transition-fast);
}

.premium-table tr:last-child td {
  border-bottom: none;
}

.premium-table tr:hover td {
  background: var(--gray-50);
}

.dark-mode .premium-table tr:hover td {
  background: rgba(255, 255, 255, 0.02);
}

/* Responsive */
@media (max-width: 1024px) {
  .course-header-grid {
    grid-template-columns: 1fr;
  }

  .enrollment-card-premium {
    position: static;
    margin-bottom: var(--spacing-xl);
  }
}

/* ===== Form Container & Mentor Form ===== */
.form-container {
  background: var(--bg-card);
  padding: var(--spacing-3xl);
  border-radius: var(--radius-2xl);
  border: 1px solid var(--border-color);
  max-width: 900px;
  margin: 0 auto;
  box-shadow: var(--shadow-2xl);
}

.form-header {
  margin-bottom: var(--spacing-2xl);
  text-align: center;
}

.form-header h1 {
  font-size: var(--font-size-3xl);
  font-weight: 800;
  color: var(--text-main);
  margin-bottom: var(--spacing-xs);
}

.form-header p {
  color: var(--text-muted);
}

.mentor-form .form-group {
  margin-bottom: var(--spacing-lg);
}

.mentor-form label {
  display: block;
  margin-bottom: var(--spacing-sm);
  font-weight: 600;
  color: var(--text-main);
  font-size: var(--font-size-sm);
}

.mentor-form input[type="text"],
.mentor-form input[type="number"],
.mentor-form input[type="email"],
.mentor-form input[type="password"],
.mentor-form textarea,
.mentor-form select,
.form-input {
  width: 100%;
  padding: var(--spacing-md);
  background: var(--gray-50);
  border: 1px solid var(--border-color);
  border-radius: var(--radius-lg);
  color: var(--text-main);
  font-family: inherit;
  transition: all var(--transition-base);
}

.mentor-form input::placeholder,
.form-input::placeholder {
  color: var(--text-muted);
  opacity: 1;
}

.mentor-form input:focus,
.mentor-form textarea:focus,
.mentor-form select:focus,
.form-input:focus {
  outline: none;
  border-color: var(--primary);
  background: var(--bg-card);
  box-shadow: 0 0 0 4px rgba(212, 175, 55, 0.15);
}

.form-row {
  display: grid;
  grid-template-columns: 1fr 1fr;
  gap: var(--spacing-lg);
}

.checkbox-wrapper {
  display: flex;
  align-items: center;
  gap: var(--spacing-sm);
  padding: var(--spacing-md);
  background: var(--gray-50);
  border-radius: var(--radius-lg);
  border: 1px solid var(--border-color);
}

.file-upload-wrapper {
  padding: var(--spacing-md);
  background: var(--gray-50);
  border: 2px dashed var(--border-color);
  border-radius: var(--radius-lg);
  text-align: center;
  transition: all var(--transition-base);
}

.file-upload-wrapper:hover {
  border-color: var(--primary);
  background: var(--gray-100);
}

/* ===== Breadcrumb ===== */
.breadcrumb {
  display: flex;
  align-items: center;
  gap: var(--spacing-xs);
  margin-bottom: var(--spacing-xl);
  padding: var(--spacing-sm) var(--spacing-md);
  background: var(--bg-card);
  border-radius: var(--radius-lg);
  width: fit-content;
  border: 1px solid var(--border-color);
}

.breadcrumb a {
  color: var(--primary);
  text-decoration: none;
  font-weight: 600;
  font-size: var(--font-size-sm);
  transition: all var(--transition-fast);
}

.breadcrumb a:hover {
  color: var(--primary-dark);
}

.breadcrumb .material-icons {
  font-size: 18px;
  color: var(--text-muted);
}

.breadcrumb span:last-child {
  color: var(--text-muted);
  font-size: var(--font-size-sm);
}

/* ===== Module Item Active State ===== */
.module-item.active {
  background: var(--primary) !important;
  color: #000000 !important;
  box-shadow: 0 4px 12px rgba(212, 175, 55, 0.3);
}

.module-item.active .module-title,
.module-item.active .module-meta,
.module-item.active .material-icons {
  color: #000000 !important;
}

/* ===== Certificate Card ===== */
.certificate-card {
  border: 4px solid var(--primary);
  border-radius: var(--radius-xl);
  padding: var(--spacing-4xl);
  background: linear-gradient(135deg, #ffffff 0%, #f8fafc 100%);
  color: #000000;
  text-align: center;
  box-shadow: var(--shadow-2xl);
  position: relative;
  overflow: hidden;
}

.certificate-card h2 {
  font-size: var(--font-size-3xl);
  color: var(--primary);
  margin-bottom: var(--spacing-lg);
  font-weight: 800;
}

.certificate-card h3 {
  color: #000000;
  font-weight: 700;
}

.certificate-card p {
  color: #334155;
}

.certificate-card .issue-info {
  border-top: 2px solid #cbd5e1;
  margin-top: var(--spacing-3xl);
  padding-top: var(--spacing-xl);
  color: #475569;
}

/* ===== Question Block (Quiz Builder) ===== */
.question-block {
  background: var(--bg-card);
  border: 1px solid var(--border-color);
  border-radius: var(--radius-xl);
  padding: var(--spacing-2xl);
  margin-bottom: var(--spacing-2xl);
  box-shadow: var(--shadow-sm);
}

.question-block h4 {
  color: var(--text-main);
  font-size: var(--font-size-lg);
}

.option-row {
  background: var(--bg-card);
  padding: var(--spacing-sm);
  border-radius: var(--radius-lg);
  border: 1px solid var(--border-color);
  margin-bottom: var(--spacing-sm);
}

.option-row input[type="text"] {
  background: transparent;
  border: none;
  color: var(--text-main);
}

.option-row input[type="text"]:focus {
  background: transparent;
  box-shadow: none;
}

.btn-icon-danger {
  background: transparent;
  border: none;
  color: var(--danger);
  cursor: pointer;
  display: flex;
  align-items: center;
  justify-content: center;
  padding: 4px;
  border-radius: 4px;
  transition: background 0.2s;
}

.btn-icon-danger:hover {
  background: rgba(239, 68, 68, 0.1);
}

/* Button as Label (File Upload) */
label.btn-secondary {
  display: inline-flex;
  align-items: center;
  gap: var(--spacing-sm);
  padding: var(--spacing-md) var(--spacing-xl);
  background: var(--gray-100);
  color: var(--text-main);
  border: 1px solid var(--border-color);
  border-radius: var(--radius-lg);
  cursor: pointer;
  font-weight: 600;
  transition: all var(--transition-base);
}

label.btn-secondary:hover {
  background: var(--gray-200);
  border-color: var(--primary);
}

/* Responsive Fixes */
@media (max-width: 768px) {
  .form-row {
    grid-template-columns: 1fr;
  }

  .certificate-card {
    padding: var(--spacing-xl);
  }
}

/* Mentor Layout */
.mentor-container {
  max-width: 900px;
  margin: 40px auto;
  padding: 0 20px;
}

/* Import Page */
.import-container {
  background: var(--bg-card);
  border-radius: 24px;
  padding: 48px;
  border: 1px solid var(--border-color);
  box-shadow: var(--shadow-xl);
}

.import-header {
  text-align: center;
  margin-bottom: 40px;
}

.icon-circle {
  width: 80px;
  height: 80px;
  background: var(--primary-lighter);
  color: var(--primary);
  border-radius: 50%;
  display: flex;
  align-items: center;
  justify-content: center;
  margin: 0 auto 20px;
}

.import-instructions {
  background: var(--gray-50);
  border-radius: 16px;
  padding: 24px;
  margin-bottom: 32px;
  border: 1px solid var(--border-color);
}

.file-drop-area {
  position: relative;
  display: flex;
  flex-direction: column;
  align-items: center;
  padding: 40px;
  border: 2px dashed var(--border-color);
  border-radius: 20px;
  background: var(--gray-50);
  transition: all 0.2s;
  cursor: pointer;
  margin-bottom: 32px;
}

.file-drop-area:hover,
.file-drop-area.dragover {
  border-color: var(--primary);
  background: rgba(212, 175, 55, 0.05);
}

.file-drop-area .material-icons {
  font-size: 48px;
  color: var(--text-muted);
  margin-bottom: 16px;
}

.mentor-info-bar {
  display: flex;
  align-items: center;
  gap: var(--spacing-xl);
  flex-wrap: wrap;
}

.mentor-profile {
  display: flex;
  align-items: center;
  gap: var(--spacing-md);
}

.mentor-avatar {
  width: 48px;
  height: 48px;
  border-radius: var(--radius-full);
  object-fit: cover;
  background: var(--primary);
  display: flex;
  align-items: center;
  justify-content: center;
  color: #0f172a;
  font-weight: 700;
  border: 2px solid #334155;
}

.mentor-meta {
  display: flex;
  flex-direction: column;
}

.mentor-name {
  font-weight: 700;
  font-size: var(--font-size-base);
  color: white;
}

.mentor-followers {
  font-size: var(--font-size-xs);
  color: var(--text-muted);
}

.course-stats-bar {
  display: flex;
  align-items: center;
  gap: var(--spacing-xl);
  margin-left: auto;
  background: rgba(15, 23, 42, 0.4);
  padding: var(--spacing-sm) var(--spacing-lg);
  border-radius: var(--radius-full);
  border: 1px solid #334155;
}

.stat-item {
  display: flex;
  align-items: center;
  gap: var(--spacing-xs);
  color: var(--gray-400);
  font-size: var(--font-size-sm);
  font-weight: 600;
}

.stat-item .material-icons {
  font-size: 20px;
  color: var(--primary);
}

/* Tabs */
.course-tabs {
  display: flex;
  gap: var(--spacing-sm);
  border-bottom: 1px solid var(--border-color);
  padding-bottom: var(--spacing-md);
  margin-top: var(--spacing-md);
}

.tab-item {
  padding: var(--spacing-sm) var(--spacing-xl);
  border-radius: var(--radius-full);
  font-weight: 700;
  font-size: var(--font-size-sm);
  color: var(--text-muted);
  cursor: pointer;
  transition: all var(--transition-base);
  border: 1px solid transparent;
  white-space: nowrap;
}

.tab-item.active {
  background: var(--primary);
  color: #0f172a;
  box-shadow: 0 4px 12px rgba(212, 175, 55, 0.3);
}

.tab-item:not(.active):hover {
  background: #1e293b;
  color: white;
  border-color: #334155;
}

/* Sidebar Components */
.sidebar-card {
  background: #1e293b;
  border-radius: var(--radius-2xl);
  padding: var(--spacing-xl);
  border: 1px solid var(--border-color);
  margin-bottom: var(--spacing-xl);
  box-shadow: var(--shadow-lg);
}

.sidebar-card-title {
  font-size: var(--font-size-xl);
  font-weight: 800;
  margin-bottom: var(--spacing-xl);
  color: white;
}

/* Module Timeline */
.module-timeline {
  display: flex;
  flex-direction: column;
  gap: var(--spacing-lg);
  position: relative;
}

.module-timeline::before {
  content: '';
  position: absolute;
  left: 17px;
  top: 10px;
  bottom: 10px;
  width: 2px;
  background: #334155;
  z-index: 0;
}

.timeline-item {
  display: flex;
  gap: var(--spacing-lg);
  position: relative;
  z-index: 1;
  text-decoration: none;
  transition: transform 0.2s ease;
}

.timeline-item:hover {
  transform: translateX(4px);
}

.timeline-dot {
  width: 36px;
  height: 36px;
  border-radius: var(--radius-full);
  background: #0f172a;
  border: 2px solid #334155;
  display: flex;
  align-items: center;
  justify-content: center;
  font-size: var(--font-size-xs);
  font-weight: 800;
  color: var(--text-muted);
  flex-shrink: 0;
  transition: all var(--transition-base);
}

.timeline-item.active .timeline-dot {
  background: var(--primary);
  border-color: var(--primary);
  color: #0f172a;
  box-shadow: 0 0 15px rgba(212, 175, 55, 0.4);
}

.timeline-content {
  flex: 1;
  background: #0f172a;
  border: 1px solid #334155;
  border-radius: var(--radius-xl);
  padding: var(--spacing-lg);
  transition: all var(--transition-base);
}

.timeline-item.active .timeline-content {
  background: var(--primary-light);
  border-color: var(--primary);
  box-shadow: 0 4px 20px rgba(0, 0, 0, 0.2);
}

.timeline-title {
  font-weight: 700;
  font-size: var(--font-size-base);
  color: white;
  margin-bottom: var(--spacing-sm);
  line-height: 1.4;
}

.timeline-item.active .timeline-title {
  color: #0f172a;
}

.timeline-meta {
  display: flex;
  justify-content: space-between;
  align-items: center;
  font-size: var(--font-size-xs);
  color: var(--text-muted);
}

.timeline-item.active .timeline-meta {
  color: rgba(15, 23, 42, 0.7);
}

.timeline-duration {
  display: flex;
  align-items: center;
  gap: 6px;
  font-weight: 600;
}

.timeline-status .material-icons {
  font-size: 20px;
}

/* Enrollment Sidebar Action */
.enrollment-action-card {
  background: var(--primary);
  border-radius: var(--radius-2xl);
  padding: var(--spacing-xl);
  text-align: center;
  box-shadow: 0 10px 30px rgba(212, 175, 55, 0.2);
}

.enrollment-action-card .price-tag {
  font-size: var(--font-size-3xl);
  font-weight: 900;
  color: #0f172a;
  margin-bottom: var(--spacing-lg);
  display: block;
}

.enrollment-action-card .btn-primary {
  background: #0f172a;
  color: var(--primary);
  width: 100%;
  padding: var(--spacing-lg);
  font-size: var(--font-size-base);
  border-radius: var(--radius-xl);
}

.enrollment-action-card .btn-primary:hover {
  background: #1e293b;
  transform: translateY(-2px);
}

/* Responsive */
@media (max-width: 1100px) {
  .course-detail-grid {
    grid-template-columns: 1fr;
  }

  .course-stats-bar {
    margin-left: 0;
    width: 100%;
    justify-content: space-around;
  }
}