/**
 * Learn Anything Fast - Main Stylesheet
 * Clean, professional design with focus on readability and accessibility
 */

/* ============================================================================
   CSS RESET & BASE STYLES
   ============================================================================ */

* {
  margin: 0;
  padding: 0;
  box-sizing: border-box;
}

:root {
  /* Color Palette - Modern & Sophisticated */
  --primary-color: #3B82F6;
  --primary-hover: #2563EB;
  --primary-light: #EFF6FF;
  --secondary-color: #6B7280;
  --success-color: #10B981;
  --danger-color: #EF4444;
  --warning-color: #F59E0B;
  --info-color: #06B6D4;

  /* Neutral Colors - Warmer & More Modern */
  --white: #ffffff;
  --gray-50: #F9FAFB;
  --gray-100: #F3F4F6;
  --gray-200: #E5E7EB;
  --gray-300: #D1D5DB;
  --gray-400: #9CA3AF;
  --gray-500: #6B7280;
  --gray-600: #4B5563;
  --gray-700: #374151;
  --gray-800: #1F2937;
  --gray-900: #111827;
  --black: #000000;

  /* Spacing */
  --spacing-xs: 4px;
  --spacing-sm: 8px;
  --spacing-md: 16px;
  --spacing-lg: 24px;
  --spacing-xl: 32px;
  --spacing-2xl: 48px;

  /* Typography */
  --font-family: -apple-system, BlinkMacSystemFont, 'Segoe UI', 'Roboto', 'Oxygen',
    'Ubuntu', 'Cantarell', 'Fira Sans', 'Droid Sans', 'Helvetica Neue',
    sans-serif;
  --font-size-xs: 12px;
  --font-size-sm: 14px;
  --font-size-base: 16px;
  --font-size-lg: 18px;
  --font-size-xl: 20px;
  --font-size-2xl: 24px;
  --font-size-3xl: 30px;

  /* Borders */
  --border-radius: 4px;
  --border-radius-lg: 8px;
  --border-color: var(--gray-300);

  /* Shadows - More Pronounced & Modern */
  --shadow-sm: 0 1px 3px 0 rgba(0, 0, 0, 0.08);
  --shadow-md: 0 4px 12px 0 rgba(0, 0, 0, 0.08);
  --shadow-lg: 0 20px 25px -5px rgba(0, 0, 0, 0.1), 0 10px 10px -5px rgba(0, 0, 0, 0.04);
  --shadow-xl: 0 25px 50px -12px rgba(0, 0, 0, 0.25);

  /* Transitions */
  --transition-fast: 150ms ease-in-out;
  --transition-base: 250ms ease-in-out;
}

html {
  font-size: 16px;
  -webkit-font-smoothing: antialiased;
  -moz-osx-font-smoothing: grayscale;
}

body {
  font-family: var(--font-family);
  font-size: var(--font-size-base);
  line-height: 1.5;
  color: var(--gray-900);
  background: linear-gradient(to bottom, #F8FAFC, #F1F5F9);
  min-height: 100vh;
}

/* ============================================================================
   LAYOUT COMPONENTS
   ============================================================================ */

.main-content,
#main-content {
  padding-top: calc(56px + var(--spacing-lg)); /* Account for fixed header height */
}

.container {
  max-width: 1200px;
  margin: 0 auto;
  padding: var(--spacing-lg);
}

.centered-layout {
  display: flex;
  justify-content: center;
  align-items: center;
  min-height: 100vh;
  padding: var(--spacing-lg);
}

.centered-form {
  width: 100%;
  max-width: 400px;
  background: var(--white);
  padding: var(--spacing-2xl);
  border-radius: var(--border-radius-lg);
  box-shadow: var(--shadow-lg);
}

/* ============================================================================
   HEADER NAVIGATION
   ============================================================================ */

.header {
  background: var(--white);
  border-bottom: 1px solid var(--border-color);
  padding: 0 var(--spacing-md);
  position: fixed;
  top: 0;
  left: 0;
  right: 0;
  z-index: 100;
  box-shadow: var(--shadow-sm);
  height: 56px;
}

.header-content {
  max-width: 1200px;
  margin: 0 auto;
  display: flex;
  justify-content: space-between;
  align-items: center;
  height: 100%;
  gap: var(--spacing-md);
}

/* Logo Styles */
.header-logo {
  display: flex;
  align-items: center;
  text-decoration: none;
  transition: opacity var(--transition-fast);
}

.header-logo:hover {
  opacity: 0.8;
}

.header-logo-img {
  max-height: 40px;
  width: auto;
  display: block;
}

@media (min-width: 769px) {
  .header {
    height: 64px;
    padding: 0 var(--spacing-lg);
  }

  .header-logo-img {
    max-height: 48px;
  }

  .main-content,
  #main-content {
    padding-top: calc(64px + var(--spacing-lg)); /* Account for taller desktop header */
  }
}

/* Navigation Links */
.header-nav {
  display: flex;
  align-items: center;
  gap: var(--spacing-md);
}

/* Desktop Navigation - Hidden on mobile */
.header-nav-desktop {
  display: none;
}

@media (min-width: 769px) {
  .header-nav-desktop {
    display: flex;
    align-items: center;
    gap: var(--spacing-lg);
  }
}

.nav-link {
  color: var(--gray-700);
  text-decoration: none;
  font-weight: 500;
  transition: color var(--transition-fast);
  padding: var(--spacing-sm) var(--spacing-md);
  border-radius: var(--border-radius);
}

.nav-link:hover {
  color: var(--primary-color);
  background: var(--gray-100);
}

.nav-link.active {
  color: var(--primary-color);
  font-weight: 600;
  background: var(--primary-light);
}

/* Hamburger Menu Button (Mobile Only) */
.mobile-nav-toggle {
  display: flex;
  align-items: center;
  justify-content: center;
  width: 44px;
  height: 44px;
  padding: 0;
  background: none;
  border: none;
  cursor: pointer;
  color: var(--gray-700);
  transition: background-color var(--transition-fast);
  border-radius: var(--border-radius);
}

.mobile-nav-toggle:hover {
  background: var(--gray-100);
}

.mobile-nav-toggle:active {
  background: var(--gray-200);
}

@media (min-width: 769px) {
  .mobile-nav-toggle {
    display: none;
  }
}

/* Hamburger Icon */
.hamburger-icon {
  width: 24px;
  height: 24px;
  position: relative;
  display: flex;
  flex-direction: column;
  justify-content: space-around;
}

.hamburger-icon span {
  display: block;
  height: 2px;
  width: 100%;
  background: currentColor;
  border-radius: 2px;
  transition: all var(--transition-base);
}

/* Animated hamburger to X */
.mobile-nav-toggle.active .hamburger-icon span:nth-child(1) {
  transform: rotate(45deg) translate(5px, 5px);
}

.mobile-nav-toggle.active .hamburger-icon span:nth-child(2) {
  opacity: 0;
}

.mobile-nav-toggle.active .hamburger-icon span:nth-child(3) {
  transform: rotate(-45deg) translate(7px, -7px);
}

/* Mobile Navigation Panel */
.mobile-nav-panel {
  position: fixed;
  top: 56px;
  left: 0;
  width: 280px;
  height: calc(100vh - 56px);
  background: var(--white);
  border-right: 1px solid var(--border-color);
  box-shadow: var(--shadow-lg);
  transform: translateX(-100%);
  transition: transform var(--transition-base);
  overflow-y: auto;
  z-index: 99;
}

.mobile-nav-panel.active {
  transform: translateX(0);
}

@media (min-width: 769px) {
  .mobile-nav-panel {
    display: none;
  }
}

/* Mobile nav overlay */
.mobile-nav-overlay {
  display: none;
  position: fixed;
  top: 56px;
  left: 0;
  right: 0;
  bottom: 0;
  background: rgba(0, 0, 0, 0.5);
  z-index: 98;
  opacity: 0;
  transition: opacity var(--transition-base);
}

.mobile-nav-overlay.active {
  display: block;
  opacity: 1;
}

/* Mobile Navigation Menu Items */
.mobile-nav-menu {
  list-style: none;
  padding: var(--spacing-md) 0;
  margin: 0;
}

.mobile-nav-item {
  border-bottom: 1px solid var(--gray-200);
}

.mobile-nav-item:last-child {
  border-bottom: none;
}

.mobile-nav-link {
  display: flex;
  align-items: center;
  gap: var(--spacing-md);
  padding: var(--spacing-md) var(--spacing-lg);
  color: var(--gray-900);
  text-decoration: none;
  font-weight: 500;
  transition: background-color var(--transition-fast);
  min-height: 48px;
}

.mobile-nav-link:hover {
  background: var(--gray-100);
}

.mobile-nav-link.active {
  background: var(--primary-light);
  color: var(--primary-color);
  font-weight: 600;
}

.mobile-nav-icon {
  font-size: var(--font-size-xl);
  min-width: 24px;
  text-align: center;
}

/* Mobile Nav Section Headers */
.mobile-nav-section {
  padding: var(--spacing-lg) var(--spacing-lg) var(--spacing-sm);
  font-size: var(--font-size-xs);
  font-weight: 600;
  text-transform: uppercase;
  letter-spacing: 0.5px;
  color: var(--gray-600);
}

/* Back Button */
.btn-back {
  display: inline-flex;
  align-items: center;
  gap: var(--spacing-xs);
  padding: var(--spacing-xs) var(--spacing-sm);
  background: none;
  border: none;
  color: var(--gray-700);
  font-weight: 500;
  font-size: var(--font-size-sm);
  cursor: pointer;
  transition: color var(--transition-fast);
  border-radius: var(--border-radius);
}

.btn-back:hover {
  color: var(--primary-color);
  background: var(--gray-100);
}

.btn-back-icon {
  font-size: var(--font-size-lg);
}

/* Breadcrumb Navigation */
.breadcrumb {
  display: flex;
  align-items: center;
  gap: var(--spacing-xs);
  font-size: var(--font-size-sm);
  color: var(--gray-600);
  overflow-x: auto;
  white-space: nowrap;
  padding: var(--spacing-xs) 0;
}

.breadcrumb-item {
  display: inline-flex;
  align-items: center;
  gap: var(--spacing-xs);
}

.breadcrumb-link {
  color: var(--gray-600);
  text-decoration: none;
  transition: color var(--transition-fast);
}

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

.breadcrumb-separator {
  color: var(--gray-400);
}

.breadcrumb-current {
  color: var(--gray-900);
  font-weight: 500;
}

/* Active Session Indicator */
.session-indicator {
  display: inline-flex;
  align-items: center;
  gap: var(--spacing-xs);
  padding: var(--spacing-xs) var(--spacing-sm);
  background: var(--success-color);
  color: var(--white);
  border-radius: 12px;
  font-size: var(--font-size-xs);
  font-weight: 600;
  text-decoration: none;
  transition: all var(--transition-fast);
}

.session-indicator:hover {
  background: #1e8035;
  transform: translateY(-1px);
  box-shadow: var(--shadow-sm);
}

.session-indicator-pulse {
  width: 6px;
  height: 6px;
  background: var(--white);
  border-radius: 50%;
  animation: pulse 2s infinite;
}

@keyframes pulse {
  0%, 100% { opacity: 1; }
  50% { opacity: 0.5; }
}

/* User Menu */
.user-menu {
  position: relative;
}

.user-menu-trigger {
  display: flex;
  align-items: center;
  gap: var(--spacing-sm);
  padding: var(--spacing-sm) var(--spacing-md);
  background: var(--gray-100);
  border: 1px solid var(--border-color);
  border-radius: var(--border-radius);
  cursor: pointer;
  transition: all var(--transition-fast);
  font-family: inherit;
  font-size: var(--font-size-base);
  color: var(--gray-900);
}

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

.user-menu-trigger:focus {
  outline: 2px solid var(--primary-color);
  outline-offset: 2px;
}

.user-menu-dropdown {
  position: absolute;
  top: calc(100% + var(--spacing-sm));
  right: 0;
  min-width: 200px;
  background: var(--white);
  border: 1px solid var(--border-color);
  border-radius: var(--border-radius);
  box-shadow: var(--shadow-lg);
  display: none;
  z-index: 200;
}

.user-menu-dropdown.active,
.user-menu-dropdown.show {
  display: block;
}

.dropdown-item {
  display: block;
  width: 100%;
  padding: var(--spacing-md);
  text-align: left;
  background: none;
  border: none;
  border-bottom: 1px solid var(--gray-200);
  cursor: pointer;
  font-family: inherit;
  font-size: var(--font-size-base);
  color: var(--gray-900);
  transition: background-color var(--transition-fast);
}

.dropdown-item:last-child {
  border-bottom: none;
}

.dropdown-item:hover {
  background: var(--gray-100);
}

.dropdown-item:focus {
  outline: 2px solid var(--primary-color);
  outline-offset: -2px;
}

.dropdown-item.disabled {
  color: var(--gray-500);
  cursor: not-allowed;
}

.dropdown-item.disabled:hover {
  background: none;
}

/* Dropdown divider */
.dropdown-divider {
  height: 0;
  margin: var(--spacing-xs) 0;
  overflow: hidden;
  border-top: 1px solid var(--gray-300);
}

/* User icon in menu trigger */
.user-icon {
  font-size: var(--font-size-xl);
  line-height: 1;
}

/* ============================================================================
   FORM ELEMENTS
   ============================================================================ */

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

.form-label {
  display: block;
  margin-bottom: var(--spacing-sm);
  font-weight: 500;
  color: var(--gray-900);
  font-size: var(--font-size-base);
}

.form-input {
  width: 100%;
  padding: var(--spacing-md);
  border: 1px solid var(--border-color);
  border-radius: var(--border-radius);
  font-family: inherit;
  font-size: var(--font-size-base);
  line-height: 1.5;
  color: var(--gray-900);
  background-color: var(--white);
  transition: border-color var(--transition-fast), box-shadow var(--transition-fast);
}

.form-input:focus {
  outline: none;
  border-color: var(--primary-color);
  box-shadow: 0 0 0 3px rgba(0, 123, 255, 0.1);
}

.form-input::placeholder {
  color: var(--gray-500);
}

.form-input:disabled {
  background-color: var(--gray-100);
  cursor: not-allowed;
}

.form-input.error {
  border-color: var(--danger-color);
}

.form-input.error:focus {
  box-shadow: 0 0 0 3px rgba(220, 53, 69, 0.1);
}

.form-hint {
  display: block;
  margin-top: var(--spacing-xs);
  font-size: var(--font-size-sm);
  color: var(--gray-600);
}

.error-message {
  display: none;
  margin-top: var(--spacing-sm);
  padding: var(--spacing-sm) var(--spacing-md);
  background-color: #f8d7da;
  border: 1px solid #f5c6cb;
  border-radius: var(--border-radius);
  color: #721c24;
  font-size: var(--font-size-sm);
}

.error-message.visible {
  display: block;
}

.success-message {
  display: none;
  margin-top: var(--spacing-sm);
  padding: var(--spacing-sm) var(--spacing-md);
  background-color: #d4edda;
  border: 1px solid #c3e6cb;
  border-radius: var(--border-radius);
  color: #155724;
  font-size: var(--font-size-sm);
}

.success-message.visible {
  display: block;
}

.field-error {
  display: none;
  margin-top: var(--spacing-xs);
  color: var(--danger-color);
  font-size: var(--font-size-sm);
}

.field-error.visible {
  display: block;
}

/* Checkbox */
.form-checkbox {
  display: flex;
  align-items: flex-start;
  gap: var(--spacing-sm);
}

.form-checkbox input[type="checkbox"] {
  margin-top: 3px;
  width: 18px;
  height: 18px;
  cursor: pointer;
}

.form-checkbox label {
  flex: 1;
  cursor: pointer;
  font-size: var(--font-size-sm);
  line-height: 1.4;
}

/* ============================================================================
   BUTTONS
   ============================================================================ */

.btn {
  display: inline-flex;
  align-items: center;
  justify-content: center;
  gap: var(--spacing-sm);
  padding: var(--spacing-md) var(--spacing-lg);
  border: 1px solid transparent;
  border-radius: var(--border-radius);
  font-family: inherit;
  font-size: var(--font-size-base);
  font-weight: 500;
  line-height: 1.5;
  text-align: center;
  text-decoration: none;
  cursor: pointer;
  transition: all var(--transition-fast);
  user-select: none;
}

.btn:focus {
  outline: 2px solid var(--primary-color);
  outline-offset: 2px;
}

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

.btn-primary:hover {
  color: var(--white);
  background-color: var(--primary-hover);
  border-color: var(--primary-hover);
  text-decoration: none;
}

.btn-primary:disabled {
  background-color: var(--gray-500);
  border-color: var(--gray-500);
  cursor: not-allowed;
  opacity: 1;
  color: var(--white);
}

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

.btn-secondary:hover {
  color: var(--white);
  background-color: var(--gray-700);
  border-color: var(--gray-700);
  text-decoration: none;
}

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

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

.btn-link {
  color: var(--primary-color);
  background-color: transparent;
  border-color: transparent;
  padding: 0;
  text-decoration: underline;
}

.btn-link:hover {
  color: var(--primary-hover);
}

.btn-block {
  display: flex;
  width: 100%;
}

/* Loading Spinner */
.spinner {
  display: inline-block;
  width: 16px;
  height: 16px;
  border: 2px solid currentColor;
  border-right-color: transparent;
  border-radius: 50%;
  animation: spinner 0.75s linear infinite;
  vertical-align: middle;
  margin-right: 4px;
}

/* White spinner for disabled buttons */
.btn:disabled .spinner {
  border-color: var(--white);
  border-right-color: transparent;
}

@keyframes spinner {
  to { transform: rotate(360deg); }
}

/* ============================================================================
   TYPOGRAPHY
   ============================================================================ */

h1, h2, h3, h4, h5, h6 {
  margin-bottom: var(--spacing-md);
  font-weight: 600;
  line-height: 1.2;
  color: var(--gray-900);
}

h1 {
  font-size: var(--font-size-3xl);
}

h2 {
  font-size: var(--font-size-2xl);
}

h3 {
  font-size: var(--font-size-xl);
}

p {
  margin-bottom: var(--spacing-md);
}

a {
  color: var(--primary-color);
  text-decoration: none;
}

a:hover {
  color: var(--primary-hover);
  text-decoration: underline;
}

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

.text-muted {
  color: var(--gray-600);
}

.text-small {
  font-size: var(--font-size-sm);
}

/* ============================================================================
   DASHBOARD COMPONENTS
   ============================================================================ */

.welcome-section {
  margin-bottom: var(--spacing-lg);
}

.welcome-title {
  font-size: var(--font-size-2xl);
  margin-bottom: var(--spacing-sm);
  font-weight: 700;
}

/* Dashboard Stats Cards */
.stats-grid {
  display: grid;
  grid-template-columns: repeat(auto-fit, minmax(200px, 1fr));
  gap: var(--spacing-md);
  margin-bottom: var(--spacing-2xl);
}

@media (min-width: 769px) {
  .stats-grid {
    grid-template-columns: repeat(3, 1fr);
  }
}

.stat-card {
  background: var(--white);
  border: 1px solid var(--gray-200);
  border-radius: 12px;
  padding: var(--spacing-lg);
  box-shadow: var(--shadow-sm);
  transition: all var(--transition-base);
  display: flex;
  flex-direction: column;
  gap: var(--spacing-sm);
}

.stat-card:hover {
  box-shadow: var(--shadow-md);
  transform: translateY(-2px);
}

.stat-card-header {
  display: flex;
  align-items: center;
  gap: var(--spacing-sm);
}

.stat-icon {
  font-size: 24px;
  width: 48px;
  height: 48px;
  display: flex;
  align-items: center;
  justify-content: center;
  border-radius: 10px;
  flex-shrink: 0;
}

.stat-icon.stat-icon-progress {
  background: linear-gradient(135deg, #EFF6FF, #DBEAFE);
  color: var(--primary-color);
}

.stat-icon.stat-icon-completed {
  background: linear-gradient(135deg, #D1FAE5, #A7F3D0);
  color: var(--success-color);
}

.stat-icon.stat-icon-time {
  background: linear-gradient(135deg, #FEF3C7, #FDE68A);
  color: var(--warning-color);
}

.stat-content {
  flex: 1;
}

.stat-label {
  font-size: var(--font-size-sm);
  color: var(--gray-600);
  font-weight: 500;
  text-transform: uppercase;
  letter-spacing: 0.5px;
  margin-bottom: 2px;
}

.stat-value {
  font-size: 28px;
  font-weight: 700;
  color: var(--gray-900);
  line-height: 1;
}

.section-title {
  font-size: var(--font-size-xl);
  margin-bottom: var(--spacing-lg);
  color: var(--gray-900);
  font-weight: 600;
}

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

.section-header .section-title {
  margin-bottom: 0;
}

/* Course Cards */
.course-list {
  display: grid;
  grid-template-columns: repeat(auto-fill, minmax(300px, 1fr));
  gap: var(--spacing-md);
  margin-bottom: var(--spacing-xl);
}

@media (min-width: 769px) {
  .course-list {
    grid-template-columns: repeat(3, 1fr);
  }
}

@media (min-width: 1200px) {
  .course-list {
    grid-template-columns: repeat(3, 1fr);
  }
}

.course-card {
  background: var(--white);
  border: 1px solid var(--gray-200);
  border-radius: 12px;
  padding: var(--spacing-xl);
  box-shadow: var(--shadow-sm);
  transition: all var(--transition-base);
  position: relative;
  overflow: hidden;
}

.course-card::before {
  content: '';
  position: absolute;
  top: 0;
  left: 0;
  right: 0;
  height: 4px;
  background: linear-gradient(90deg, var(--primary-color), var(--info-color));
  opacity: 0;
  transition: opacity var(--transition-base);
}

.course-card:hover {
  box-shadow: var(--shadow-lg);
  transform: translateY(-2px);
  border-color: var(--gray-300);
}

.course-card:hover::before {
  opacity: 1;
}

.course-card-title {
  font-size: var(--font-size-lg);
  font-weight: 600;
  margin-bottom: var(--spacing-sm);
  color: var(--gray-900);
}

.course-card-description {
  font-size: var(--font-size-sm);
  color: var(--gray-600);
  margin-top: var(--spacing-md);
  margin-bottom: var(--spacing-md);
  line-height: 1.4;
  display: -webkit-box;
  -webkit-line-clamp: 2;
  -webkit-box-orient: vertical;
  overflow: hidden;
  text-overflow: ellipsis;
}

.course-card-meta {
  font-size: var(--font-size-sm);
  color: var(--gray-600);
  margin-bottom: var(--spacing-md);
}

.course-progress-bar-container {
  margin-top: var(--spacing-md);
  margin-bottom: var(--spacing-md);
}

.course-progress-bar {
  width: 100%;
  height: 8px;
  background-color: #e5e7eb;
  border-radius: 4px;
  overflow: hidden;
}

.course-progress-bar-fill {
  height: 100%;
  background: linear-gradient(90deg, #3b82f6, #2563eb);
  border-radius: 4px;
  transition: width 0.3s ease-out;
}

.course-card-actions {
  display: flex;
  gap: var(--spacing-md);
  margin-top: var(--spacing-lg);
}

/* Compact Course Cards (Mobile-friendly) */
.course-card-compact {
  background: var(--white);
  border: 1px solid var(--border-color);
  border-radius: var(--border-radius-lg);
  padding: var(--spacing-md);
  box-shadow: var(--shadow-sm);
  transition: box-shadow var(--transition-fast);
  position: relative;
}

.course-card-compact:hover {
  box-shadow: var(--shadow-md);
}

.course-card-header {
  display: flex;
  justify-content: space-between;
  align-items: flex-start;
  gap: var(--spacing-sm);
  margin-bottom: var(--spacing-sm);
  position: relative;
}

.course-card-compact .course-card-title {
  font-size: var(--font-size-lg);
  font-weight: 600;
  margin: 0;
  color: var(--gray-900);
  cursor: pointer;
  transition: color var(--transition-fast);
  flex: 1;
}

.course-card-compact .course-card-title:hover {
  color: var(--primary-color);
}

/* Menu Button */
.btn-menu {
  background: none;
  border: none;
  padding: var(--spacing-sm);
  cursor: pointer;
  color: var(--gray-600);
  transition: all var(--transition-fast);
  border-radius: var(--border-radius);
  display: flex;
  align-items: center;
  justify-content: center;
  min-width: 40px;
  min-height: 40px;
}

.btn-menu:hover {
  background: var(--gray-100);
  color: var(--gray-900);
}

.btn-menu:active {
  transform: scale(0.95);
}

/* Course Menu Dropdown */
.course-menu {
  position: absolute;
  top: 100%;
  right: 0;
  background: var(--white);
  border: 1px solid var(--border-color);
  border-radius: var(--border-radius);
  box-shadow: var(--shadow-lg);
  min-width: 180px;
  display: none;
  z-index: 10;
  margin-top: var(--spacing-xs);
}

.course-menu.active {
  display: block;
}

.course-menu button {
  display: block;
  width: 100%;
  padding: var(--spacing-md);
  border: none;
  background: none;
  text-align: left;
  cursor: pointer;
  font-family: inherit;
  font-size: var(--font-size-base);
  color: var(--gray-900);
  transition: background-color var(--transition-fast);
  border-bottom: 1px solid var(--gray-200);
}

.course-menu button:last-child {
  border-bottom: none;
}

.course-menu button:hover {
  background: var(--gray-100);
}

.course-menu button.danger {
  color: var(--danger-color);
}

.course-menu button.danger:hover {
  background: rgba(220, 53, 69, 0.1);
}

/* Progress Button */
.course-progress-button {
  width: 100%;
  padding: var(--spacing-sm) var(--spacing-md);
  background: var(--primary-light);
  border: 1px solid var(--primary-color);
  border-radius: var(--border-radius);
  color: var(--primary-color);
  font-family: inherit;
  font-size: var(--font-size-base);
  font-weight: 600;
  cursor: pointer;
  transition: all var(--transition-fast);
  min-height: 44px;
}

.course-progress-button:hover {
  background: var(--primary-color);
  color: var(--white);
  transform: translateY(-1px);
  box-shadow: var(--shadow-sm);
}

.course-progress-button:active {
  transform: translateY(0);
}

/* Mobile optimization */
@media (max-width: 768px) {
  .course-card-compact .course-card-title {
    font-size: var(--font-size-base);
  }

  .course-progress-button {
    font-size: var(--font-size-base);
  }

  /* Course Builder: Setup page margins and spacing */
  .main-content:has(#courseSetup) .container {
    padding: var(--spacing-md) !important;
  }

  #courseSetup .page-header {
    margin-bottom: var(--spacing-md);
  }

  #courseSetup .intention-selection-grid {
    margin-bottom: var(--spacing-md);
  }

  /* Course Builder: Fix intention cards - reduce height, prevent text overlay */
  #courseSetup .intention-card-content {
    display: flex !important;
    flex-direction: column !important;
    align-items: center !important;
    height: auto !important;
    min-height: 120px !important;
    padding: var(--spacing-md) !important;
    gap: var(--spacing-xs) !important;
    justify-content: flex-start !important; /* Prevent text overlay on mobile */
  }

  #courseSetup .intention-icon {
    font-size: 36px;
    margin-bottom: 0;
  }

  #courseSetup .intention-card h3 {
    font-size: var(--font-size-base);
    margin: 0;
  }

  #courseSetup .intention-card p {
    font-size: var(--font-size-sm);
    line-height: 1.3;
    margin: 0;
  }

  /* Course Builder: Document upload and action buttons spacing */
  #courseSetup .document-option-container {
    margin-bottom: var(--spacing-md);
  }

  #courseSetup .action-buttons {
    margin-top: var(--spacing-md);
  }
}

/* Empty State */
.empty-state {
  text-align: center;
  padding: var(--spacing-2xl);
  background: var(--white);
  border: 2px dashed var(--border-color);
  border-radius: var(--border-radius-lg);
  margin-bottom: var(--spacing-xl);
}

.empty-state-icon {
  font-size: 48px;
  color: var(--gray-400);
  margin-bottom: var(--spacing-md);
}

.empty-state-title {
  font-size: var(--font-size-lg);
  margin-bottom: var(--spacing-sm);
  color: var(--gray-700);
}

.empty-state-text {
  color: var(--gray-600);
  margin-bottom: var(--spacing-lg);
}

/* ============================================================================
   UTILITY CLASSES
   ============================================================================ */

.hidden {
  display: none !important;
}

.visible {
  display: block !important;
}

.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); }

.p-1 { padding: var(--spacing-sm); }
.p-2 { padding: var(--spacing-md); }
.p-3 { padding: var(--spacing-lg); }
.p-4 { padding: var(--spacing-xl); }

/* ============================================================================
   RESPONSIVE DESIGN
   ============================================================================ */

@media (max-width: 768px) {
  .container {
    padding: var(--spacing-sm) var(--spacing-md);
  }

  .main-content,
  #main-content {
    padding-top: calc(56px + var(--spacing-sm)); /* Account for fixed header on mobile */
  }

  .centered-layout {
    padding: var(--spacing-md);
  }

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

  /* Header stays horizontal with hamburger menu */
  .header-content {
    flex-direction: row;
  }

  .course-card-actions {
    flex-direction: column;
  }

  .btn {
    width: 100%;
  }

  /* Reduce button padding in section headers to prevent title wrapping */
  .section-header .btn {
    width: auto; /* Override width: 100% */
    padding: var(--spacing-sm) var(--spacing-sm); /* Reduce horizontal padding significantly */
    font-size: var(--font-size-sm); /* Slightly smaller text */
  }

  h1 {
    font-size: var(--font-size-2xl);
  }

  h2 {
    font-size: var(--font-size-xl);
  }

  /* Make breadcrumbs more compact on mobile */
  .breadcrumb {
    font-size: var(--font-size-xs);
  }

  /* Session indicator slightly smaller on mobile */
  .session-indicator {
    font-size: 10px;
    padding: 2px var(--spacing-xs);
  }
}

@media (min-width: 769px) and (max-width: 1024px) {
  .container {
    max-width: 960px;
  }
}

/* ============================================================================
   ACCESSIBILITY
   ============================================================================ */

/* Focus visible for keyboard navigation */
*:focus-visible {
  outline: 2px solid var(--primary-color);
  outline-offset: 2px;
}

/* Skip to main content link */
.skip-link {
  position: absolute;
  top: -40px;
  left: 0;
  background: var(--primary-color);
  color: var(--white);
  padding: var(--spacing-sm) var(--spacing-md);
  text-decoration: none;
  z-index: 1000;
}

.skip-link:focus {
  top: 0;
}

/* Screen reader only */
.sr-only {
  position: absolute;
  width: 1px;
  height: 1px;
  padding: 0;
  margin: -1px;
  overflow: hidden;
  clip: rect(0, 0, 0, 0);
  white-space: nowrap;
  border-width: 0;
}

/* ============================================================================
   PHASE 2: COURSE BUILDER & TUTORING SESSION STYLES
   ============================================================================ */

/* Chat Interface Styles */
.course-builder-card,
.tutor-session-card {
  background: #fafafa;
  border-radius: var(--border-radius-lg);
  box-shadow: none;
  border: 1px solid var(--gray-200);
  margin-bottom: 0;
  overflow: hidden;
  display: flex;
  flex-direction: column;
  /* Full height minus nav bar */
  height: calc(100vh - 56px - var(--spacing-lg) * 2);
}

/* CourseBuilder: Account for page-header and action-buttons around scoping phase chat */
#scopingPhase .course-builder-card {
  /* Subtract space for:
     - page-header: 60px (h2 height ~36px + h2 margin 8px + page-header margin 16px)
     - action-buttons: 88px (margin-top 16px + button 56px + margin-bottom 16px)
     - main-content padding-top: 24px (not in base calculation)
  */
  height: calc(100vh - 56px - var(--spacing-lg) * 3 - 60px - 88px - 24px);
}

/* Document upload phase - prevent page scroll by constraining everything */
body:has(#documentUploadPhase:not([style*="display: none"])) {
  overflow: hidden;
}

body:has(#documentUploadPhase:not([style*="display: none"])) .main-content {
  height: calc(100vh - 56px);
  overflow: hidden;
  padding: 0;
}

body:has(#documentUploadPhase:not([style*="display: none"])) .container {
  height: 100%;
  display: flex;
  flex-direction: column;
}

#documentUploadPhase {
  flex: 1;
  display: flex;
  flex-direction: column;
  min-height: 0;
  overflow: hidden;
}

#documentUploadPhase .page-header {
  flex-shrink: 0;
  padding: calc(56px + var(--spacing-lg)) var(--spacing-lg) 0 var(--spacing-lg);  /* Top padding includes fixed header height */
  border-bottom: none;
  margin-bottom: var(--spacing-sm);  /* Reduce space below header */
}

#documentUploadPhase .page-header .page-subtitle {
  border-bottom: none;
  padding-bottom: 0;
}

/* Reduce vertical spacing in document upload left column */
#documentUploadPhase .attestation-container {
  margin-bottom: var(--spacing-xs);
}

#documentUploadPhase .action-buttons {
  margin-top: var(--spacing-xs);
  margin-bottom: var(--spacing-xs);
}

#documentUploadPhase .course-builder-card {
  flex: 1;
  min-height: 0;
  overflow: hidden;  /* Changed from auto - columns handle their own overflow */
  margin: var(--spacing-sm) var(--spacing-lg) var(--spacing-lg) var(--spacing-lg);  /* Reduced top margin */
  padding: 0;  /* Remove padding - columns handle their own */
}

/* Two-column layout for document upload */
.document-upload-layout {
  display: flex;
  flex-direction: row;  /* Explicit horizontal layout */
  gap: 0;  /* Remove gap, use margin instead */
  padding: var(--spacing-lg);  /* Add padding to container */
  background: #ebebeb;  /* Match page background so gap is visible */
  height: 100%;
}

/* Left column: Fixed controls - NO SCROLLBAR */
.upload-controls-column {
  flex: 1;  /* Let flexbox handle equal distribution */
  min-width: 0;  /* Allow shrinking */
  margin-right: var(--spacing-lg);  /* Space between columns */
  display: flex;
  flex-direction: column;
  gap: var(--spacing-sm);  /* Reduced from --spacing-md for tighter layout */
  padding: var(--spacing-md);  /* Reduced from --spacing-lg */
  overflow: hidden;  /* Never scrolls */
  background: var(--white);
  border-radius: var(--border-radius-lg);
  box-shadow: var(--shadow-sm);
}

/* Right column: Scrollable files list ONLY */
.uploaded-files-column {
  flex: 1;  /* Let flexbox handle equal distribution */
  min-width: 0;  /* Allow shrinking */
  padding: var(--spacing-lg);
  overflow-y: auto;  /* Only this scrolls */
  background: var(--white);
  border-radius: var(--border-radius-lg);
  box-shadow: var(--shadow-sm);
}

/* Uploaded files list adjustments */
.uploaded-files-column .uploaded-files-list {
  display: flex;  /* Always visible, flex layout */
  flex-direction: column;
  height: 100%;
}

.uploaded-files-column .uploaded-files-list h4 {
  flex-shrink: 0;
  margin: 0 0 var(--spacing-md);
}

.uploaded-files-column #filesContainer {
  flex: 1;
  max-height: none;  /* Remove previous height constraint */
  overflow-y: visible;  /* Parent handles scrolling */
}

.uploaded-files-column .files-summary {
  flex-shrink: 0;
  margin-top: var(--spacing-md);
}

/* Empty files placeholder */
.empty-files-placeholder {
  text-align: center;
  padding: var(--spacing-xl) var(--spacing-lg);
  color: var(--gray-500);
}

.empty-files-placeholder p {
  margin: 0;
}

.placeholder-hint {
  font-size: var(--font-size-sm);
  margin-top: var(--spacing-sm) !important;
}

/* Mobile: Stack vertically, normal page scroll */
@media (max-width: 768px) {
  /* Allow page to scroll on mobile */
  body:has(#documentUploadPhase:not([style*="display: none"])) {
    overflow: auto;
  }

  body:has(#documentUploadPhase:not([style*="display: none"])) .main-content {
    height: auto;
    overflow: visible;
  }

  #documentUploadPhase {
    height: auto;
    overflow: visible;
  }

  #documentUploadPhase .course-builder-card {
    height: auto;
    overflow: visible;
  }

  .document-upload-layout {
    flex-direction: column;
    height: auto;
  }

  .upload-controls-column {
    flex: none;
    overflow: visible;
  }

  .uploaded-files-column {
    flex: none;
    overflow: visible;
    border-left: none;
    border-top: 1px solid var(--border-color);
    max-height: none;
  }

  .uploaded-files-column #filesContainer {
    overflow-y: visible;
  }
}

.chat-header {
  background: var(--gray-100);
  padding: var(--spacing-md);
  border-bottom: 1px solid var(--border-color);
  flex-shrink: 0;
}

.chat-header h3 {
  margin: 0;
  font-size: var(--font-size-lg);
  color: var(--gray-800);
}

/* ==================== Image Review Gallery ==================== */

.include-images-container {
  margin-bottom: 12px;
}

.image-review-gallery {
  display: grid;
  grid-template-columns: repeat(auto-fill, minmax(220px, 1fr));
  gap: 16px;
  padding: 16px;
  max-height: 60vh;
  overflow-y: auto;
}

.image-candidate-card {
  border: 2px solid #e0e0e0;
  border-radius: 8px;
  transition: border-color 0.2s, opacity 0.2s;
  background: #fff;
}

.image-candidate-card.accepted {
  border-color: #4caf50;
}

.image-candidate-card.rejected {
  border-color: #ccc;
  opacity: 0.5;
}

.image-candidate-card.cropped .candidate-thumbnail {
  outline: 2px dashed #4a90d9;
  outline-offset: -2px;
}

.candidate-thumbnail-container {
  background: #f0f0f0;
  display: flex;
  align-items: center;
  justify-content: center;
}

.candidate-thumbnail {
  width: 100%;
  height: auto;
  display: block;
}

.candidate-card-footer {
  border-top: 1px solid #eee;
}

.candidate-info {
  padding: 8px 12px 4px;
  display: flex;
  gap: 8px;
  align-items: center;
  flex-wrap: wrap;
  font-size: 0.8rem;
}

.candidate-source-badge {
  padding: 2px 8px;
  border-radius: 10px;
  font-size: 0.7rem;
  font-weight: 600;
}

.candidate-source-badge.embedded {
  background: #e3f2fd;
  color: #1565c0;
}

.candidate-source-badge.screenshot {
  background: #fff3e0;
  color: #e65100;
}

.candidate-source-badge.manual_upload {
  background: #e8f5e9;
  color: #2e7d32;
}

.candidate-page {
  color: #666;
}

.crop-indicator {
  background: #e8eaf6;
  color: #3949ab;
  padding: 2px 8px;
  border-radius: 10px;
  font-size: 0.7rem;
  font-weight: 600;
}

.candidate-actions {
  padding: 4px 12px 8px;
  display: flex;
  gap: 6px;
}

.candidate-btn {
  flex: 1;
  padding: 6px 8px;
  border: 1px solid #ddd;
  border-radius: 4px;
  background: #fff;
  cursor: pointer;
  font-size: 0.75rem;
  transition: all 0.15s;
}

.candidate-btn:hover {
  background: #f5f5f5;
}

.accept-btn.active {
  background: #e8f5e9;
  border-color: #4caf50;
  color: #2e7d32;
}

.reject-btn.active {
  background: #fce4ec;
  border-color: #e57373;
  color: #c62828;
}

.crop-btn {
  flex: 0.7;
}

.image-review-actions {
  padding: 16px;
  border-top: 1px solid #eee;
  display: flex;
  justify-content: space-between;
  align-items: center;
  flex-wrap: wrap;
  gap: 12px;
}

.image-review-summary {
  font-size: 0.9rem;
  color: #555;
  font-weight: 500;
}

.image-review-buttons {
  display: flex;
  gap: 8px;
  flex-wrap: wrap;
}

.upload-image-btn {
  cursor: pointer;
}

.loading-text {
  text-align: center;
  padding: 40px;
  color: #888;
}

/* Crop Tool Modal */
.crop-modal {
  position: fixed;
  top: 0;
  left: 0;
  right: 0;
  bottom: 0;
  background: rgba(0, 0, 0, 0.7);
  z-index: 10000;
  display: flex;
  align-items: center;
  justify-content: center;
}

.crop-modal-content {
  background: #fff;
  border-radius: 8px;
  padding: 24px;
  max-width: 90vw;
  max-height: 90vh;
  overflow: auto;
}

.crop-modal-content h3 {
  margin: 0 0 4px;
}

.crop-instructions {
  color: #666;
  font-size: 0.85rem;
  margin: 0 0 16px;
}

.crop-canvas-container {
  border: 1px solid #ddd;
  border-radius: 4px;
  overflow: hidden;
  display: inline-block;
}

#cropCanvas {
  display: block;
  cursor: crosshair;
}

.crop-modal-actions {
  margin-top: 16px;
  display: flex;
  gap: 8px;
  justify-content: flex-end;
}

/* Mobile responsiveness */
@media (max-width: 768px) {
  .image-review-gallery {
    grid-template-columns: repeat(auto-fill, minmax(160px, 1fr));
    gap: 10px;
    padding: 10px;
  }

  .image-review-actions {
    flex-direction: column;
    align-items: stretch;
  }

  .image-review-buttons {
    flex-direction: column;
  }

  .candidate-thumbnail-container {
    min-height: 100px;
    max-height: 180px;
  }
}

/* ==================== Inline Course Images ==================== */

.inline-media-container {
  margin: 12px 0;
  text-align: center;
}

.inline-media-loading {
  color: #999;
  font-size: 0.85rem;
  padding: 20px;
  background: #f5f5f5;
  border-radius: 6px;
}

.inline-media-img {
  /* Cap width near the tutor text column width (~749px) so images line up
     with the surrounding copy. Smaller images keep their natural size —
     we don't upscale. No height cap, so portrait images don't get squashed. */
  max-width: 700px;
  width: auto;
  height: auto;
  border-radius: 6px;
  border: 1px solid #e0e0e0;
  cursor: pointer;
  transition: box-shadow 0.2s;
}

.inline-media-img:hover {
  box-shadow: 0 2px 8px rgba(0, 0, 0, 0.15);
}

/* Media Viewer Overlay (click-to-zoom lightbox) */
.media-viewer-overlay {
  position: fixed;
  top: 0;
  left: 0;
  right: 0;
  bottom: 0;
  background: rgba(0, 0, 0, 0.85);
  z-index: 10000;
  display: flex;
  align-items: center;
  justify-content: center;
  cursor: pointer;
}

.media-viewer-content {
  position: relative;
  max-width: 90vw;
  max-height: 90vh;
  cursor: default;
}

.media-viewer-content img {
  max-width: 90vw;
  max-height: 85vh;
  object-fit: contain;
  border-radius: 4px;
}

.media-viewer-close {
  position: absolute;
  top: -12px;
  right: -12px;
  width: 32px;
  height: 32px;
  border-radius: 50%;
  border: none;
  background: #fff;
  color: #333;
  font-size: 1.2rem;
  cursor: pointer;
  display: flex;
  align-items: center;
  justify-content: center;
  box-shadow: 0 2px 8px rgba(0, 0, 0, 0.3);
}

.chat-container {
  flex: 1; /* Fill available space and allow internal scrolling */
  overflow-y: auto;
  padding: var(--spacing-lg);
  padding-bottom: var(--spacing-lg);
  background: #fafafa;
  display: flex;
  flex-direction: column;
  gap: 0;
  min-height: 0; /* Important for flex scrolling */
  -webkit-overflow-scrolling: touch; /* Smooth scrolling on iOS */
}

/* Hide scrollbars on mobile */
@media (max-width: 768px) {
  .chat-container::-webkit-scrollbar {
    display: none; /* Hide scrollbar for Chrome, Safari, Opera */
  }
  .chat-container {
    -ms-overflow-style: none; /* Hide scrollbar for IE and Edge */
    scrollbar-width: none; /* Hide scrollbar for Firefox */
  }
}

.chat-container-tutor {
  /* Inherits flex: 1 from .chat-container - no fixed height needed */
}

.message {
  width: 100%;
  max-width: 800px;
  margin: 0 auto var(--spacing-md);
  padding: var(--spacing-lg);
  border-left: 3px solid transparent;
  border-radius: var(--border-radius);
  word-wrap: break-word;
  overflow-wrap: break-word;
  position: relative;
  font-size: var(--font-size-base);
  line-height: 1.6;
}

/* Desktop: Larger, more readable text */
@media (min-width: 769px) {
  .message {
    font-size: 17px;
    line-height: 1.65;
  }
}

.message-agent,
.message-tutor {
  background: #fafafa; /* Match chat container background - blends seamlessly */
  border-left-color: transparent; /* No accent stripe for AI messages */
  color: var(--gray-900);
}

.message-student {
  background: #f0f7ff;
  border-left-color: var(--primary-color);
  color: var(--gray-900);
}

/* Prevent empty paragraphs from creating visible space during streaming */
.message-tutor p:empty,
.message-student p:empty {
  display: none;
}

/* Remove bottom margin from last paragraph to eliminate extra space */
.message-tutor p:last-child,
.message-student p:last-child {
  margin-bottom: 0;
}

/* Message labels */
.message-label {
  display: block;
  font-size: 10px;
  font-weight: 500;
  color: var(--gray-500);
  margin-top: calc(var(--spacing-sm) * -1);  /* Pull up to reduce space above */
  margin-bottom: var(--spacing-xs);
}

.message-action {
  background: var(--gray-100);
  align-self: center;
  max-width: 90%;
  text-align: center;
  padding: var(--spacing-lg);
  border-left: none;
}

.message-action p {
  margin-bottom: var(--spacing-md);
}

.message-action .btn {
  margin: var(--spacing-xs);
}

/* Markdown formatting in messages */
.message strong {
  font-weight: 600;
}

.message code {
  background: rgba(0, 0, 0, 0.1);
  padding: 2px 6px;
  border-radius: var(--border-radius);
  font-family: 'Monaco', 'Courier New', monospace;
  font-size: 0.9em;
}

.message pre {
  background: rgba(0, 0, 0, 0.05);
  padding: var(--spacing-md);
  border-radius: var(--border-radius);
  overflow-x: auto;
  margin: var(--spacing-sm) 0;
}

.message pre code {
  background: none;
  padding: 0;
}

.message ul,
.message ol {
  list-style-position: inside;
  margin: var(--spacing-sm) 0;
  padding-left: 0;
}

.message li {
  margin: var(--spacing-sm) 0;
}

/* Fix for loose lists - remove margin and make inline so content stays on same line as number */
.message ol li p,
.message ul li p {
  margin: 0;
  display: inline;
}

/* Practice Block - Highlighted section for exercises/questions */
.practice-block {
  background: #fffbf0; /* Light yellow - warm, attention-grabbing, research-backed for focus */
  /* Alternative: #f0fff4 for light green (uncomment to test growth mindset color) */
  padding: var(--spacing-md);
  border-radius: var(--border-radius);
  margin-top: var(--spacing-md);
  border-left: 3px solid #f59e0b; /* Subtle orange accent to draw the eye */
}

/* Ensure spacing is correct for content inside practice block */
.practice-block > *:first-child {
  margin-top: 0;
}

.practice-block > *:last-child {
  margin-bottom: 0;
}

/* Ensure code blocks inside practice blocks maintain proper styling */
.practice-block pre {
  background: rgba(0, 0, 0, 0.05);
}

.practice-block code {
  background: rgba(0, 0, 0, 0.05);
}

/* Chat Input */
.chat-input-container {
  display: flex;
  gap: var(--spacing-sm);
  padding: var(--spacing-md);
  background: var(--white);
  border-top: 1px solid var(--border-color);
  flex-shrink: 0;
  align-items: center;
  justify-content: center;
  max-width: 100%;
}

/* Direct children (textarea, buttons) get proper width in row layout */
.chat-input-container > .chat-input {
  flex: 1 1 auto;
  max-width: 600px;
}

/* Tutor session uses column layout for skip controls above input */
.chat-input-container.has-skip-controls {
  flex-direction: column;
}

/* CourseBuilder uses column layout for Cancel button below input */
.chat-input-container.has-action-buttons {
  flex-direction: column;
}

.action-buttons {
  display: flex;
  justify-content: center;
  width: 100%;
  max-width: 800px;
}

/* In column layout, input takes full width of its row */
.chat-input-container.has-skip-controls > .input-row > .chat-input {
  max-width: none;
}

.input-row {
  display: flex;
  gap: var(--spacing-sm);
  width: 100%;
  max-width: 800px;
}

.send-button {
  flex: 0 0 auto;
}

.mic-button {
  flex: 0 0 auto;
  width: 44px;
  height: 44px;
  border-radius: 50%;
  border: 1px solid var(--border-color);
  background: var(--white);
  color: var(--text-secondary);
  cursor: pointer;
  display: flex;
  align-items: center;
  justify-content: center;
  transition: all 0.2s;
  align-self: flex-end;
}

.mic-button:hover {
  border-color: var(--primary-color);
  color: var(--primary-color);
  background: var(--primary-light);
}

.mic-button.listening {
  border-color: #e53e3e;
  color: #e53e3e;
  background: #fff5f5;
  animation: mic-pulse 1.5s ease-in-out infinite;
}

@keyframes mic-pulse {
  0%, 100% { box-shadow: 0 0 0 0 rgba(229,62,62,0.3); }
  50% { box-shadow: 0 0 0 8px rgba(229,62,62,0); }
}

.chat-input {
  flex: 1 1 auto;
  padding: var(--spacing-md);
  border: 1px solid var(--border-color);
  border-radius: var(--border-radius);
  font-family: var(--font-family);
  font-size: var(--font-size-base);
  resize: none;
  min-height: 44px;
  max-height: 200px;
  transition: border-color var(--transition-fast);
}

.chat-input:focus {
  outline: none;
  border-color: var(--primary-color);
  box-shadow: 0 0 0 3px var(--primary-light);
}

.input-controls {
  display: flex;
  flex-direction: column;
  gap: var(--spacing-xs);
  align-items: flex-end;
}

/* Skip Controls - Allow students to indicate topic preferences */
.skip-controls {
  display: flex;
  gap: var(--spacing-sm);
  align-items: center;
  justify-content: center;
  width: 100%;
  max-width: 800px;
}

.skip-btn {
  display: flex;
  align-items: center;
  gap: 6px;
  padding: 6px 12px;
  border: 1px solid var(--gray-300);
  border-radius: var(--border-radius);
  background: var(--white);
  cursor: pointer;
  transition: all 0.2s ease;
  color: var(--gray-600);
  font-size: var(--font-size-sm);
}

.skip-btn:hover {
  background: var(--gray-100);
  border-color: var(--primary-color);
  color: var(--primary-color);
}

.skip-btn:active {
  transform: scale(0.98);
}

.skip-btn:disabled {
  opacity: 0.5;
  cursor: not-allowed;
}

.skip-btn svg {
  width: 14px;
  height: 14px;
  flex-shrink: 0;
}

.streaming-toggle {
  display: flex;
  align-items: center;
  gap: 8px;
  font-size: var(--font-size-sm);
  color: var(--gray-700);
  cursor: pointer;
  user-select: none;
}

.streaming-toggle input[type="checkbox"] {
  cursor: pointer;
  width: 16px;
  height: 16px;
}

.toggle-label {
  white-space: nowrap;
}

.send-button {
  display: block; /* Visible for mobile users to prevent accidental cancel clicks */
  align-self: flex-end;
}

/* Streaming cursor animation */
@keyframes blink {
  0%, 50% { opacity: 1; }
  51%, 100% { opacity: 0; }
}

.streaming-cursor {
  display: inline-block;
  width: 2px;
  height: 1em;
  background-color: var(--primary-color);
  margin-left: 2px;
  animation: blink 1s infinite;
  vertical-align: text-bottom;
}

.loading-indicator {
  text-align: center;
  color: var(--gray-600);
  font-style: italic;
  padding: var(--spacing-sm) var(--spacing-md);
  background: var(--gray-100);
  border-top: 1px solid var(--border-color);
  font-size: var(--font-size-sm);
  /* Fixed above input area */
  position: fixed;
  bottom: 0;
  left: 0;
  right: 0;
  z-index: 50;
  /* Hide by default, shown via inline style when active */
  transform: translateY(100%);
  transition: transform var(--transition-base);
}

/* Progress Container (Course Generation) */
.progress-container {
  max-width: 600px;
  margin: 0 auto;
  padding: var(--spacing-2xl);
  text-align: center;
  background: var(--white);
  border-radius: var(--border-radius-lg);
  box-shadow: var(--shadow-md);
}

.progress-container h2 {
  margin-bottom: var(--spacing-xl);
  color: var(--gray-800);
}

.progress-steps {
  list-style: none;
  padding: 0;
  margin: var(--spacing-xl) 0;
  text-align: left;
}

.progress-step {
  padding: var(--spacing-md);
  margin: var(--spacing-sm) 0;
  border-radius: var(--border-radius);
  display: flex;
  align-items: center;
  gap: var(--spacing-md);
}

.progress-step.complete {
  background: #d4edda;
  color: #155724;
}

.progress-step.active {
  background: #fff3cd;
  color: #856404;
}

.progress-step.pending {
  background: var(--gray-100);
  color: var(--gray-600);
}

.step-icon {
  font-size: var(--font-size-lg);
  font-weight: bold;
  min-width: 24px;
}

.step-text {
  flex: 1;
}

.progress-bar-container {
  margin: var(--spacing-xl) 0;
}

.progress-bar {
  width: 100%;
  height: 24px;
  background: var(--gray-200);
  border-radius: var(--border-radius);
  overflow: hidden;
}

.progress-bar-fill {
  height: 100%;
  background: linear-gradient(90deg, var(--primary-color), var(--info-color));
  transition: width 0.5s ease-out;
}

.progress-text {
  margin-top: var(--spacing-sm);
  font-size: var(--font-size-lg);
  font-weight: 600;
  color: var(--gray-800);
}

.progress-message {
  color: var(--gray-600);
  margin-top: var(--spacing-md);
}

/* Success Container (Course Ready) */
.success-container {
  max-width: 600px;
  margin: 0 auto;
  padding: var(--spacing-2xl);
  text-align: center;
  background: var(--white);
  border-radius: var(--border-radius-lg);
  box-shadow: var(--shadow-md);
}

.success-icon {
  font-size: 64px;
  margin-bottom: var(--spacing-lg);
}

.success-container h2 {
  color: var(--success-color);
  margin-bottom: var(--spacing-xl);
}

.course-summary {
  margin: var(--spacing-xl) 0;
  padding: var(--spacing-lg);
  background: var(--gray-100);
  border-radius: var(--border-radius);
}

.course-summary h3 {
  margin-bottom: var(--spacing-md);
  color: var(--gray-800);
}

.course-details {
  color: var(--gray-600);
  margin-bottom: var(--spacing-sm);
}

.course-duration {
  color: var(--gray-600);
  font-size: var(--font-size-sm);
}

.success-actions {
  display: flex;
  flex-direction: column;
  gap: var(--spacing-md);
  max-width: 400px;
  margin: var(--spacing-xl) auto 0;
}

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

/* Session Header */
.session-header {
  display: flex;
  justify-content: space-between;
  align-items: flex-start;
  margin-bottom: var(--spacing-md);
  padding: var(--spacing-md) var(--spacing-lg);
  background: var(--white);
  border-radius: var(--border-radius-lg);
  box-shadow: var(--shadow-sm);
  flex-shrink: 0;
}

.session-info h2 {
  margin: 0 0 var(--spacing-xs);
  font-size: var(--font-size-xl);
  color: var(--gray-900);
  line-height: 1.3;
}

.session-subtitle {
  margin: 0;
  color: var(--gray-600);
  font-size: var(--font-size-sm);
  line-height: 1.4;
}

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

.turn-counter {
  background: var(--gray-100);
  padding: var(--spacing-xs) var(--spacing-md);
  border-radius: var(--border-radius);
  font-size: var(--font-size-sm);
  color: var(--gray-700);
  font-weight: 500;
}

.session-controls {
  display: flex;
  gap: var(--spacing-md);
  justify-content: center;
  margin-top: var(--spacing-lg);
}

/* Mastery Toast */
.mastery-toast {
  position: fixed;
  top: 80px;
  right: 20px;
  background: var(--white);
  border: 1px solid var(--success-color);
  border-radius: var(--border-radius-lg);
  box-shadow: var(--shadow-lg);
  padding: var(--spacing-lg);
  max-width: 350px;
  z-index: 1000;
  animation: slideInRight 0.3s ease-out;
}

@keyframes slideInRight {
  from {
    transform: translateX(400px);
    opacity: 0;
  }
  to {
    transform: translateX(0);
    opacity: 1;
  }
}

.mastery-toast-content h4 {
  margin: 0 0 var(--spacing-md);
  color: var(--success-color);
  font-size: var(--font-size-base);
}

.mastery-update-item {
  display: flex;
  align-items: center;
  justify-content: space-between;
  padding: var(--spacing-sm) 0;
  border-bottom: 1px solid var(--gray-200);
}

.mastery-update-item:last-child {
  border-bottom: none;
}

.unit-name {
  flex: 1;
  font-size: var(--font-size-sm);
  color: var(--gray-800);
}

.mastery-change {
  font-size: var(--font-size-sm);
  font-weight: 600;
  margin: 0 var(--spacing-sm);
}

.mastery-change.positive {
  color: var(--success-color);
}

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

.mastery-change.neutral {
  color: var(--gray-600);
}

.mastery-score {
  font-size: var(--font-size-sm);
  color: var(--gray-700);
  font-weight: 500;
}

/* Error Banner */
.error-banner {
  position: fixed;
  top: 70px;
  left: 50%;
  transform: translateX(-50%);
  background: var(--danger-color);
  color: var(--white);
  padding: var(--spacing-md) var(--spacing-lg);
  border-radius: var(--border-radius);
  box-shadow: var(--shadow-lg);
  display: flex;
  align-items: center;
  gap: var(--spacing-md);
  max-width: 600px;
  z-index: 1000;
}

.error-banner p {
  margin: 0;
  flex: 1;
}

.error-banner .btn {
  background: var(--white);
  color: var(--danger-color);
}

/* Course Progress Page */
.progress-page-header {
  display: flex;
  justify-content: space-between;
  align-items: flex-start;
  margin-bottom: var(--spacing-md);
}

.progress-page-header h2 {
  margin: 0;
  font-size: var(--font-size-2xl);
  color: var(--gray-900);
}

.course-description {
  margin-top: var(--spacing-xs);
  color: var(--gray-600);
  font-size: var(--font-size-sm);
}

.progress-actions {
  display: flex;
  gap: var(--spacing-sm);
}

.overall-progress-card {
  background: var(--white);
  padding: var(--spacing-md);
  border-radius: var(--border-radius-lg);
  box-shadow: var(--shadow-sm);
  margin-bottom: var(--spacing-md);
}

/* Progress Metrics Container - Side by Side */
.progress-metrics-container {
  display: grid;
  grid-template-columns: 1fr 1fr;
  gap: var(--spacing-lg);
  margin-bottom: var(--spacing-sm);
}

/* Mobile: Stack vertically */
@media (max-width: 768px) {
  .progress-metrics-container {
    grid-template-columns: 1fr;
    gap: var(--spacing-md);
  }
}

/* Progress Metric Rows */
.progress-metric {
  margin-bottom: 0;
}

/* Metric Header */
.metric-header {
  display: flex;
  justify-content: space-between;
  align-items: baseline;
  margin-bottom: var(--spacing-xs);
}

.metric-title {
  margin: 0;
  font-size: var(--font-size-sm);
  font-weight: 600;
  color: var(--gray-900);
}

.metric-percentage {
  font-size: var(--font-size-base);
  font-weight: 700;
  color: var(--primary-color);
}

/* Horizontal Bar Container */
.metric-bar-container {
  width: 100%;
  height: 20px;
  background: var(--gray-200);
  border-radius: 10px;
  overflow: hidden;
  margin-bottom: var(--spacing-xs);
}

/* Horizontal Bars */
.metric-bar {
  height: 100%;
  border-radius: 10px;
  transition: width 0.6s ease-out;
  position: relative;
}

.metric-bar-taught {
  background: linear-gradient(90deg, #3b82f6, #2563eb);
}

.metric-bar-mastered {
  background: linear-gradient(90deg, #10b981, #059669);
}

/* Metric Details */
.metric-details {
  font-size: var(--font-size-xs);
  color: var(--gray-600);
  text-align: right;
}

/* Last Activity */
.last-activity {
  text-align: center;
  color: var(--gray-600);
  font-size: var(--font-size-xs);
  margin-top: var(--spacing-sm);
  padding-top: var(--spacing-sm);
  border-top: 1px solid var(--gray-200);
}

/* Curriculum Tree */
.curriculum-tree-card {
  background: var(--white);
  padding: var(--spacing-md) var(--spacing-lg);
  border-radius: var(--border-radius-lg);
  box-shadow: var(--shadow-sm);
}

.curriculum-tree-card h3 {
  margin: 0 0 var(--spacing-md);
  color: var(--gray-800);
  font-size: var(--font-size-lg);
}

.curriculum-tree {
  padding: var(--spacing-sm) 0;
}

.curriculum-group {
  margin-bottom: var(--spacing-sm);
}

.curriculum-group.level-0 {
  margin-bottom: var(--spacing-md);
}

.group-header {
  display: flex;
  align-items: center;
  gap: var(--spacing-sm);
  padding: var(--spacing-sm) var(--spacing-md);
  background: var(--gray-100);
  border-radius: var(--border-radius);
  margin-bottom: var(--spacing-xs);
  transition: background-color var(--transition-fast);
}

.group-header:hover {
  background: var(--gray-200);
}

.expand-icon {
  font-size: var(--font-size-xs);
  color: var(--gray-600);
  min-width: 12px;
  text-align: center;
}

.group-name {
  flex: 1;
  font-weight: 600;
  color: var(--gray-800);
  font-size: var(--font-size-sm);
}

.unit-count {
  font-size: var(--font-size-xs);
  color: var(--gray-600);
}

.group-content {
  margin-left: var(--spacing-lg);
  padding-left: var(--spacing-sm);
  border-left: 2px solid var(--gray-200);
}

.group-content.collapsed {
  display: none;
}

.curriculum-unit {
  display: flex;
  align-items: center;
  gap: var(--spacing-sm);
  padding: var(--spacing-xs) var(--spacing-sm);
  margin-bottom: 2px;
  border-radius: var(--border-radius);
  transition: background-color var(--transition-fast);
}

.curriculum-unit:hover {
  background: var(--gray-100);
}

.curriculum-unit.current-unit {
  background: var(--primary-light);
  font-weight: 500;
}

.unit-status {
  font-size: var(--font-size-base);
  min-width: 20px;
  text-align: center;
}

.unit-status.current {
  color: var(--primary-color);
}

.unit-status.completed {
  color: var(--success-color);
}

.unit-status.in-progress {
  color: var(--warning-color);
}

.unit-status.not-started {
  color: var(--gray-400);
}

.unit-name {
  flex: 1;
  color: var(--gray-800);
  font-size: var(--font-size-sm);
}

.unit-mastery {
  display: flex;
  align-items: center;
  gap: var(--spacing-xs);
}

.mastery-dots {
  display: flex;
  gap: 1px;
}

.mastery-dots .dot {
  font-size: var(--font-size-xs);
}

.mastery-dots .dot.filled {
  color: var(--primary-color);
}

.mastery-dots .dot.empty {
  color: var(--gray-300);
}

.mastery-score {
  font-size: var(--font-size-xs);
  color: var(--gray-700);
  font-weight: 500;
  min-width: 35px;
  text-align: right;
}

/* Loading Container */
.loading-container {
  display: flex;
  flex-direction: column;
  align-items: center;
  justify-content: center;
  padding: var(--spacing-2xl);
  text-align: center;
}

.spinner {
  width: 48px;
  height: 48px;
  border: 4px solid var(--gray-300);
  border-top-color: var(--primary-color);
  border-radius: 50%;
  animation: spin 0.8s linear infinite;
}

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

/* Action Buttons */
.action-buttons {
  display: flex;
  justify-content: center;
  gap: var(--spacing-md);
  margin-top: var(--spacing-md);
  margin-bottom: var(--spacing-md);
}

/* Page Header */
.page-header {
  margin-bottom: var(--spacing-md);
}

.page-header h2 {
  margin: 0 0 var(--spacing-sm);
  font-size: var(--font-size-3xl);
  color: var(--gray-900);
}

.subtitle {
  color: var(--gray-600);
  font-size: var(--font-size-base);
  margin: 0;
}

/* Phase Container */
.phase-container {
  animation: fadeIn 0.3s ease-out;
}

@keyframes fadeIn {
  from {
    opacity: 0;
    transform: translateY(10px);
  }
  to {
    opacity: 1;
    transform: translateY(0);
  }
}

/* Delete button icon */
.btn-icon-delete {
  background: none;
  border: none;
  padding: 8px;
  cursor: pointer;
  color: var(--text-muted);
  transition: all 0.2s;
  border-radius: 4px;
  display: flex;
  align-items: center;
  justify-content: center;
}

.btn-icon-delete:hover {
  background-color: rgba(220, 53, 69, 0.1);
  color: var(--danger-color);
}

.btn-icon-delete:active {
  transform: scale(0.95);
}

/* ============================================================================
   ADMIN DEBUG PANEL
   ============================================================================ */

/* Debug Panel Overlay */
.debug-panel-overlay {
  position: fixed;
  top: 0;
  left: 0;
  right: 0;
  bottom: 0;
  background: rgba(0, 0, 0, 0.6);
  z-index: 2000;
  display: flex;
  align-items: center;
  justify-content: center;
  padding: var(--spacing-lg);
  animation: fadeIn 0.2s ease-out;
}

/* Debug Panel Container */
.debug-panel {
  background: var(--white);
  border-radius: var(--border-radius-lg);
  box-shadow: var(--shadow-lg);
  max-width: 1200px;
  width: 100%;
  max-height: 90vh;
  display: flex;
  flex-direction: column;
  animation: slideUp 0.3s ease-out;
}

@keyframes slideUp {
  from {
    transform: translateY(50px);
    opacity: 0;
  }
  to {
    transform: translateY(0);
    opacity: 1;
  }
}

/* Debug Panel Header */
.debug-panel-header {
  display: flex;
  justify-content: space-between;
  align-items: center;
  padding: var(--spacing-lg);
  border-bottom: 2px solid var(--border-color);
  background: var(--gray-100);
}

.debug-panel-header h3 {
  margin: 0;
  font-size: var(--font-size-xl);
  color: var(--gray-900);
}

/* Debug Panel Body */
.debug-panel-body {
  flex: 1;
  overflow-y: auto;
  padding: var(--spacing-lg);
}

/* Debug Panel Footer */
.debug-panel-footer {
  display: flex;
  justify-content: space-between;
  align-items: center;
  padding: var(--spacing-md) var(--spacing-lg);
  border-top: 1px solid var(--border-color);
  background: var(--gray-100);
}

.debug-timestamp {
  font-size: var(--font-size-sm);
  color: var(--gray-600);
}

/* Debug Sections */
.debug-section {
  margin-bottom: var(--spacing-xl);
  padding: var(--spacing-lg);
  background: var(--white);
  border: 1px solid var(--border-color);
  border-radius: var(--border-radius);
}

.debug-section h4 {
  margin: 0 0 var(--spacing-md);
  font-size: var(--font-size-lg);
  color: var(--gray-800);
  border-bottom: 2px solid var(--primary-color);
  padding-bottom: var(--spacing-sm);
}

/* Debug Grid */
.debug-grid {
  display: grid;
  grid-template-columns: repeat(auto-fit, minmax(250px, 1fr));
  gap: var(--spacing-md);
}

.debug-item {
  display: flex;
  flex-direction: column;
  gap: var(--spacing-xs);
}

.debug-item.full-width {
  grid-column: 1 / -1;
}

.debug-label {
  font-size: var(--font-size-sm);
  font-weight: 600;
  color: var(--gray-600);
  text-transform: uppercase;
  letter-spacing: 0.5px;
}

.debug-value {
  font-size: var(--font-size-base);
  color: var(--gray-900);
  word-break: break-word;
}

.debug-value.debug-highlight {
  color: var(--primary-color);
  font-weight: 600;
}

.debug-value.debug-mono {
  font-family: 'Monaco', 'Courier New', monospace;
  font-size: var(--font-size-sm);
  background: var(--gray-100);
  padding: var(--spacing-sm);
  border-radius: var(--border-radius);
  white-space: pre-wrap;
}

/* Debug Badges */
.debug-badge {
  display: inline-block;
  padding: 2px 8px;
  border-radius: var(--border-radius);
  font-size: var(--font-size-xs);
  font-weight: 600;
  text-transform: uppercase;
}

.debug-badge-blue {
  background: #e3f2fd;
  color: #1976d2;
}

.debug-badge-green {
  background: #e8f5e9;
  color: #388e3c;
}

.debug-badge-orange {
  background: #fff3e0;
  color: #f57c00;
}

.debug-badge-gray {
  background: var(--gray-200);
  color: var(--gray-700);
}

/* Debug Roadmap */
.debug-roadmap {
  display: flex;
  flex-direction: column;
  gap: var(--spacing-sm);
}

.debug-roadmap-item {
  display: flex;
  align-items: center;
  gap: var(--spacing-md);
  padding: var(--spacing-md);
  background: var(--gray-100);
  border-radius: var(--border-radius);
  border-left: 3px solid var(--primary-color);
}

.debug-roadmap-index {
  display: flex;
  align-items: center;
  justify-content: center;
  min-width: 32px;
  height: 32px;
  background: var(--primary-color);
  color: var(--white);
  border-radius: 50%;
  font-weight: 600;
  font-size: var(--font-size-sm);
}

.debug-roadmap-details {
  flex: 1;
}

.debug-roadmap-name {
  font-weight: 600;
  color: var(--gray-900);
  margin-bottom: var(--spacing-xs);
}

.debug-roadmap-meta {
  display: flex;
  gap: var(--spacing-md);
  font-size: var(--font-size-sm);
  color: var(--gray-600);
}

/* Debug Progress List */
.debug-progress-list {
  display: flex;
  flex-direction: column;
  gap: var(--spacing-sm);
}

.debug-progress-item {
  padding: var(--spacing-md);
  background: var(--gray-100);
  border-radius: var(--border-radius);
}

.debug-progress-name {
  font-weight: 600;
  color: var(--gray-900);
  margin-bottom: var(--spacing-xs);
}

.debug-progress-details {
  display: flex;
  gap: var(--spacing-md);
  font-size: var(--font-size-sm);
  color: var(--gray-600);
  flex-wrap: wrap;
}

.debug-success {
  color: var(--success-color);
  font-weight: 600;
}

.debug-warning {
  color: var(--warning-color);
  font-weight: 600;
}

/* Debug Details (Collapsible) */
.debug-details {
  margin-top: var(--spacing-md);
  border: 1px solid var(--border-color);
  border-radius: var(--border-radius);
}

.debug-details summary {
  padding: var(--spacing-md);
  background: var(--gray-100);
  cursor: pointer;
  font-weight: 600;
  color: var(--gray-800);
  user-select: none;
}

.debug-details summary:hover {
  background: var(--gray-200);
}

.debug-json {
  margin: 0;
  padding: var(--spacing-md);
  background: var(--gray-900);
  color: #00ff00;
  font-family: 'Monaco', 'Courier New', monospace;
  font-size: var(--font-size-sm);
  overflow-x: auto;
  border-radius: 0 0 var(--border-radius) var(--border-radius);
}

/* Debug States */
.debug-loading {
  text-align: center;
  padding: var(--spacing-2xl);
  color: var(--gray-600);
  font-style: italic;
}

.debug-empty {
  text-align: center;
  padding: var(--spacing-2xl);
}

.debug-empty p {
  color: var(--gray-600);
  margin-bottom: var(--spacing-md);
}

.debug-hint {
  font-size: var(--font-size-sm);
  color: var(--gray-500);
  font-style: italic;
}

.debug-error {
  padding: var(--spacing-lg);
  background: #fee;
  border: 1px solid #fcc;
  border-radius: var(--border-radius);
  color: var(--danger-color);
}

.debug-error h4 {
  margin: 0 0 var(--spacing-sm);
  color: var(--danger-color);
}

/* Session Header Actions (for debug button) */
.session-header-actions {
  display: flex;
  gap: var(--spacing-sm);
}

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

.btn-disabled, .btn:disabled {
  opacity: 0.5;
  cursor: not-allowed;
  pointer-events: none;
}

/* Modal Styles */
.modal {
  display: none;
  position: fixed;
  z-index: 1000;
  left: 0;
  top: 0;
  width: 100%;
  height: 100%;
  overflow: auto;
  background-color: rgba(0, 0, 0, 0.5);
  align-items: center;
  justify-content: center;
}

.modal-content {
  background-color: var(--white);
  padding: var(--spacing-xl);
  border-radius: var(--border-radius-lg);
  box-shadow: var(--shadow-lg);
  max-width: 500px;
  width: 90%;
  animation: modalFadeIn 0.2s ease-out;
}

@keyframes modalFadeIn {
  from {
    opacity: 0;
    transform: translateY(-20px);
  }
  to {
    opacity: 1;
    transform: translateY(0);
  }
}

/* Responsive Design */
@media (max-width: 768px) {
  /* Hide session actions menu on mobile - items are already in hamburger menu */
  #session-actions-menu,
  #session-actions-dropdown {
    display: none !important;
  }

  .course-builder-card,
  .tutor-session-card {
    /* On mobile, maximize available viewport height (no session header) */
    height: calc(100vh - 56px - var(--spacing-md) * 2);
    max-height: none;
    border-radius: 0;
    margin-bottom: 0;
    border: none;
  }

  /* CourseBuilder mobile: Account for page-header and action-buttons */
  #scopingPhase .course-builder-card {
    /* On mobile, main-content has no padding-top, so don't subtract 24px */
    height: calc(100vh - 56px - var(--spacing-md) * 2 - 60px - 88px);
  }

  /* Remove container padding on course builder page for full-width content */
  .main-content:has(#scopingPhase) .container {
    padding-left: 0;
    padding-right: 0;
  }

  /* Add padding back to page header */
  #scopingPhase .page-header {
    padding-left: var(--spacing-md);
    padding-right: var(--spacing-md);
  }

  /* CourseBuilder: action-buttons inside chat-input-container, stacked naturally */
  #scopingPhase .action-buttons .btn {
    width: 100%; /* Full width button */
    font-size: var(--font-size-sm);
    display: flex;
    align-items: center;
    justify-content: center;
    min-height: 44px;
  }

  .chat-container {
    padding: var(--spacing-md) 0; /* Edge-to-edge horizontal, keep vertical padding */
    padding-bottom: var(--spacing-lg);
    gap: 0;
  }

  .message {
    padding: var(--spacing-md) var(--spacing-sm); /* Narrower horizontal margins for more content width */
    margin-bottom: var(--spacing-sm);
    border-radius: var(--border-radius);
    font-size: 15px; /* Slightly smaller font for more words per line */
  }

  .chat-input-container {
    padding: var(--spacing-sm);
    gap: var(--spacing-xs);
  }

  /* Fix chat input container layout on mobile - wrap Cancel button */
  .chat-input-container {
    flex-wrap: wrap; /* Allow wrapping so Cancel button can go to new line */
  }

  .chat-input-container::before,
  .chat-input-container::after {
    display: none; /* Remove centering pseudo-elements on mobile */
  }

  .chat-input {
    flex: 1 1 0; /* Take up remaining space, allow shrinking */
    min-width: 0; /* Allow shrinking below content size */
    padding: var(--spacing-sm) var(--spacing-md);
    font-size: 15px; /* Match message font size */
  }

  .send-button {
    padding: var(--spacing-sm) var(--spacing-md);
    min-width: 70px;
    max-width: 80px; /* Prevent button from being too wide */
    font-size: var(--font-size-sm);
    flex: 0 0 auto; /* Don't grow or shrink */
  }

  .mic-button {
    width: 38px;
    height: 38px;
    align-self: flex-end;
  }

  #cancelButton {
    flex: 1 1 100%; /* Take full width on new line */
    margin-top: 0; /* Gap will handle spacing */
  }

  .session-header {
    flex-direction: column;
    gap: var(--spacing-md);
    padding: var(--spacing-md);
    margin-bottom: var(--spacing-md);
  }

  .progress-page-header {
    flex-direction: column;
    gap: var(--spacing-md);
  }

  .progress-actions {
    flex-direction: column;
    width: 100%;
  }

  .progress-actions .btn {
    width: 100%;
  }

  .mastery-toast {
    right: 10px;
    left: 10px;
    max-width: none;
  }

  .session-controls {
    flex-direction: column;
  }

  .session-controls .btn {
    width: 100%;
  }

  .success-actions .btn {
    width: 100%;
  }
}

/* ============================================================================
   PHASE 3: DOCUMENT-SOURCED COURSES UI
   ============================================================================ */

/* Page Subtitle */
.page-subtitle {
  color: var(--gray-600);
  font-size: var(--font-size-base);
  margin: 0;
}

/* Mode Selection Grid (Legacy - keeping for backward compatibility) */
.mode-selection-grid {
  display: grid;
  grid-template-columns: repeat(auto-fit, minmax(280px, 1fr));
  gap: var(--spacing-lg);
  margin-bottom: var(--spacing-xl);
}

@media (min-width: 769px) {
  .mode-selection-grid {
    grid-template-columns: repeat(2, 1fr);
    max-width: 800px;
    margin-left: auto;
    margin-right: auto;
  }
}

/* Mode Card (Legacy - keeping for backward compatibility) */
.mode-card {
  background: var(--white);
  border: 2px solid var(--border-color);
  border-radius: var(--border-radius-lg);
  padding: var(--spacing-2xl);
  text-align: center;
  transition: all var(--transition-base);
  cursor: pointer;
  display: flex;
  flex-direction: column;
  align-items: center;
  gap: var(--spacing-md);
}

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

.mode-icon {
  font-size: 64px;
  margin-bottom: var(--spacing-sm);
}

.mode-card h3 {
  margin: 0 0 var(--spacing-sm);
  font-size: var(--font-size-xl);
  color: var(--gray-900);
}

.mode-card p {
  margin: 0 0 var(--spacing-lg);
  color: var(--gray-600);
  font-size: var(--font-size-base);
  line-height: 1.6;
}

.mode-select-btn {
  width: 100%;
}

/* Intention Selection Grid */
.intention-selection-grid {
  display: grid;
  grid-template-columns: repeat(auto-fit, minmax(200px, 1fr));
  gap: var(--spacing-lg);
  margin-bottom: var(--spacing-xl);
}

@media (min-width: 769px) {
  .intention-selection-grid {
    grid-template-columns: repeat(3, 1fr);
    max-width: 900px;
    margin-left: auto;
    margin-right: auto;
  }
}

/* Intention Card */
.intention-card {
  position: relative;
  cursor: pointer;
}

.intention-card input[type="radio"] {
  position: absolute;
  top: var(--spacing-md);
  right: var(--spacing-md);
  width: 20px;
  height: 20px;
  cursor: pointer;
  z-index: 1;
}

.intention-card-content {
  background: var(--white);
  border: 2px solid var(--border-color);
  border-radius: var(--border-radius-lg);
  padding: var(--spacing-xl);
  text-align: center;
  transition: all var(--transition-base);
  display: flex;
  flex-direction: column;
  align-items: center;
  justify-content: center;
  gap: var(--spacing-sm);
  height: 200px;
}

.intention-card:not(.disabled):hover .intention-card-content {
  border-color: var(--primary-color);
  box-shadow: var(--shadow-md);
  transform: translateY(-2px);
}

.intention-card input[type="radio"]:checked + .intention-card-content {
  border-color: var(--primary-color);
  background: var(--primary-light);
  box-shadow: var(--shadow-md);
}

.intention-card.disabled {
  opacity: 0.6;
  cursor: not-allowed;
}

.intention-card.disabled .intention-card-content {
  background: var(--gray-50);
}

.intention-card.disabled input[type="radio"] {
  cursor: not-allowed;
}

.intention-icon {
  font-size: 48px;
  margin-bottom: var(--spacing-xs);
}

.intention-card h3 {
  margin: 0 0 var(--spacing-xs);
  font-size: var(--font-size-lg);
  color: var(--gray-900);
  font-weight: 600;
}

.intention-card p {
  margin: 0;
  color: var(--gray-600);
  font-size: var(--font-size-sm);
  line-height: 1.4;
}

.intention-note {
  color: var(--gray-500);
  font-size: var(--font-size-xs);
  font-style: italic;
  margin-top: var(--spacing-xs);
}

.coming-soon-badge {
  position: absolute;
  top: var(--spacing-sm);
  right: var(--spacing-sm);
  background: var(--warning-color);
  color: var(--white);
  padding: 4px 8px;
  border-radius: 12px;
  font-size: 11px;
  font-weight: 600;
  text-transform: uppercase;
}

/* Document Option Container */
.document-option-container {
  max-width: 600px;
  margin: 0 auto var(--spacing-xl);
  padding: var(--spacing-lg);
  background: var(--gray-50);
  border: 1px solid var(--border-color);
  border-radius: var(--border-radius-lg);
}

.document-checkbox-label {
  display: flex;
  align-items: flex-start;
  gap: var(--spacing-md);
  cursor: pointer;
  user-select: none;
}

.document-checkbox-label input[type="checkbox"] {
  width: 20px;
  height: 20px;
  cursor: pointer;
  flex-shrink: 0;
  margin-top: 2px;
}

.checkbox-icon {
  font-size: 32px;
  flex-shrink: 0;
  line-height: 1;
}

.checkbox-content h4 {
  margin: 0 0 var(--spacing-xs);
  font-size: var(--font-size-base);
  font-weight: 600;
  color: var(--gray-900);
}

.checkbox-content p {
  margin: 0;
  font-size: var(--font-size-sm);
  color: var(--gray-600);
  line-height: 1.4;
}

/* Document Upload Section */
.upload-warning {
  display: flex;
  gap: var(--spacing-sm);
  padding: var(--spacing-sm) var(--spacing-md);
  background: #fff3cd;
  border: 1px solid #ffc107;
  border-radius: var(--border-radius);
  margin-bottom: var(--spacing-md);
}

.warning-icon {
  font-size: var(--font-size-xl);
  color: var(--warning-color);
  flex-shrink: 0;
}

.warning-content {
  flex: 1;
}

.warning-content strong {
  display: block;
  margin-bottom: var(--spacing-xs);
  color: var(--gray-900);
  font-size: var(--font-size-base);
}

.warning-content p {
  margin: 0;
  color: var(--gray-700);
  font-size: var(--font-size-sm);
  line-height: 1.4;
}

/* Dropzone */
.dropzone {
  border: 2px dashed var(--gray-400);
  border-radius: var(--border-radius-lg);
  padding: var(--spacing-2xl);
  text-align: center;
  background: var(--gray-200);
  transition: all var(--transition-base);
  cursor: pointer;
  margin-bottom: var(--spacing-md);
}

.dropzone-compact {
  padding: var(--spacing-md);
  margin-top: 0;
}

.dropzone-compact .dropzone-content {
  gap: var(--spacing-xs);
}

.dropzone-compact .upload-icon {
  font-size: 28px;
}

.dropzone-compact h3 {
  font-size: var(--font-size-base);
  margin: 0;
}

.dropzone:hover {
  border-color: var(--primary-color);
  background: var(--primary-light);
}

.dropzone.dragover {
  border-color: var(--primary-color);
  background: var(--primary-light);
  box-shadow: inset 0 0 0 2px var(--primary-color);
}

.dropzone-content {
  display: flex;
  flex-direction: column;
  align-items: center;
  gap: var(--spacing-md);
}

.upload-icon {
  font-size: 48px;
  color: var(--gray-500);
}

.dropzone h3 {
  margin: 0;
  font-size: var(--font-size-lg);
  color: var(--gray-900);
}

.dropzone-or {
  color: var(--gray-600);
  font-size: var(--font-size-sm);
  margin: 0;
}

.supported-formats {
  color: var(--gray-600);
  font-size: var(--font-size-sm);
  margin: 0;
}

/* Uploaded Files List */
.uploaded-files-list {
  margin-bottom: var(--spacing-md);
  margin-top: var(--spacing-md);
}

.uploaded-files-list h4 {
  margin: 0 0 var(--spacing-sm);
  font-size: var(--font-size-base);
  font-weight: 600;
  color: var(--gray-900);
}

#filesContainer {
  display: flex;
  flex-direction: column;
  gap: var(--spacing-sm);
  margin-bottom: var(--spacing-md);
  max-height: 400px;
  overflow-y: auto;
  padding-right: var(--spacing-xs);
}

.file-item {
  display: flex;
  align-items: center;
  gap: var(--spacing-md);
  padding: var(--spacing-md);
  background: var(--white);
  border: 1px solid var(--border-color);
  border-radius: var(--border-radius);
}

.file-icon {
  font-size: var(--font-size-2xl);
  color: var(--primary-color);
  flex-shrink: 0;
}

.file-info {
  flex: 1;
  min-width: 0;
}

.file-name {
  font-weight: 500;
  color: var(--gray-900);
  margin-bottom: var(--spacing-xs);
  white-space: nowrap;
  overflow: hidden;
  text-overflow: ellipsis;
}

.file-size {
  font-size: var(--font-size-sm);
  color: var(--gray-600);
}

.file-remove {
  background: none;
  border: none;
  color: var(--gray-500);
  cursor: pointer;
  padding: var(--spacing-sm);
  border-radius: var(--border-radius);
  transition: all var(--transition-fast);
  flex-shrink: 0;
}

.file-remove:hover {
  background: var(--danger-color);
  color: var(--white);
}

.files-summary {
  display: flex;
  justify-content: space-between;
  padding: var(--spacing-sm) 0;
  border-top: 1px solid var(--border-color);
  font-size: var(--font-size-sm);
  color: var(--gray-600);
}

/* Upload Progress Status */
.upload-progress-status {
  padding: var(--spacing-md);
  background: var(--primary-light);
  border: 1px solid var(--primary-color);
  border-radius: var(--border-radius);
  margin-top: var(--spacing-md);
  text-align: center;
}

.upload-progress-status .progress-message {
  color: var(--primary-color);
  font-weight: 500;
  font-size: var(--font-size-base);
}

/* Legal Attestation */
.attestation-container {
  margin-bottom: var(--spacing-md);
}

.attestation-label {
  display: flex;
  align-items: flex-start;
  gap: var(--spacing-md);
  cursor: pointer;
  padding: var(--spacing-md);
  background: var(--gray-100);
  border: 1px solid var(--border-color);
  border-radius: var(--border-radius);
  transition: all var(--transition-fast);
}

.attestation-label:hover {
  background: var(--gray-200);
}

.attestation-label input[type="checkbox"] {
  margin-top: 2px;
  width: 20px;
  height: 20px;
  cursor: pointer;
  flex-shrink: 0;
}

.attestation-label span {
  font-size: var(--font-size-sm);
  color: var(--gray-800);
  line-height: 1.5;
}

/* Course Badges (Dashboard) */
.course-badge {
  display: inline-block;
  padding: 4px 12px;
  border-radius: 12px;
  font-size: var(--font-size-xs);
  font-weight: 600;
  text-transform: uppercase;
  letter-spacing: 0.5px;
  margin-right: var(--spacing-sm);
}

.course-badge-document {
  background: #e3f2fd;
  color: #1976d2;
}

.course-badge-custom {
  background: #f3e5f5;
  color: #7b1fa2;
}

/* Error Container */
.error-container {
  max-width: 600px;
  margin: 0 auto;
  padding: var(--spacing-2xl);
  text-align: center;
  background: var(--white);
  border-radius: var(--border-radius-lg);
  box-shadow: var(--shadow-md);
  border: 2px solid var(--danger-color);
}

.error-content h3 {
  color: var(--danger-color);
  margin-bottom: var(--spacing-lg);
}

.error-content p {
  color: var(--gray-700);
  margin-bottom: var(--spacing-xl);
}

.error-actions {
  display: flex;
  flex-direction: column;
  gap: var(--spacing-md);
  max-width: 400px;
  margin: 0 auto;
}

/* Mobile Responsiveness */
@media (max-width: 768px) {
  /* Prevent bouncy scroll behavior on course builder page */
  html, body {
    overflow-x: hidden; /* Prevent horizontal scroll */
    -webkit-overflow-scrolling: touch; /* Smooth scrolling on iOS */
  }

  /* Ensure mode selection phase has enough height to scroll naturally */
  #modeSelection, #courseSetup {
    min-height: calc(100vh - 56px); /* Full viewport minus header */
  }

  .mode-selection-grid {
    grid-template-columns: 1fr;
    gap: var(--spacing-md);
  }

  .mode-card {
    padding: var(--spacing-md);
    display: grid; /* Use grid instead of flex */
    grid-template-columns: auto 1fr; /* Icon column (auto) + content column (fill) */
    grid-template-rows: auto auto auto; /* 3 rows: title, description, button */
    gap: var(--spacing-sm);
    text-align: left; /* Left-align content */
    align-items: start; /* Align items to top */
  }

  .mode-icon {
    font-size: 32px; /* Smaller icon */
    margin-bottom: 0; /* Remove bottom margin */
    grid-column: 1; /* First column */
    grid-row: 1; /* First row */
  }

  .mode-card h3 {
    font-size: var(--font-size-base); /* Smaller title */
    margin: 0;
    grid-column: 2; /* Second column */
    grid-row: 1; /* First row - same as icon */
    align-self: center; /* Vertically center with icon */
  }

  .mode-card p {
    font-size: var(--font-size-sm); /* Smaller description */
    margin: 0;
    line-height: 1.4;
    grid-column: 1 / -1; /* Span both columns (full width) */
    grid-row: 2; /* Second row */
  }

  .mode-select-btn {
    margin-top: var(--spacing-xs); /* Minimal top margin */
    grid-column: 1 / -1; /* Span both columns (full width) */
    grid-row: 3; /* Third row */
  }

  /* Intention Cards - Mobile Optimization */
  .intention-selection-grid {
    grid-template-columns: 1fr;
    gap: var(--spacing-md);
  }

  .intention-card-content {
    padding: var(--spacing-md);
    height: auto;
    display: grid;
    grid-template-columns: auto 1fr;
    grid-template-rows: auto auto;
    gap: var(--spacing-sm);
    text-align: left;
    align-items: start;
  }

  .intention-icon {
    font-size: 28px;
    margin-bottom: 0;
    grid-column: 1;
    grid-row: 1;
    align-self: center;
  }

  .intention-card-content h3 {
    font-size: var(--font-size-base);
    margin: 0;
    grid-column: 2;
    grid-row: 1;
    align-self: center;
  }

  .intention-card-content p {
    font-size: var(--font-size-sm);
    grid-column: 1 / -1;
    grid-row: 2;
    margin-top: var(--spacing-xs);
  }

  .intention-note {
    grid-column: 1 / -1;
    grid-row: 3;
  }

  .coming-soon-badge {
    top: var(--spacing-xs);
    right: var(--spacing-xs);
    font-size: 10px;
    padding: 3px 6px;
  }

  .document-option-container {
    padding: var(--spacing-md);
    margin-bottom: var(--spacing-lg);
  }

  .checkbox-content h4 {
    font-size: var(--font-size-sm);
  }

  .checkbox-content p {
    font-size: var(--font-size-xs);
  }

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

  .upload-icon {
    font-size: 36px;
  }

  .attestation-label {
    padding: var(--spacing-sm);
  }

  /* Mobile UX improvements - larger tap targets */
  .file-remove {
    width: 32px;
    height: 32px;
    font-size: 16px;
  }

  /* Larger checkbox for better tappability */
  .attestation-label input[type="checkbox"] {
    width: 24px;
    height: 24px;
  }

  /* Compact warning text on mobile */
  .warning-content strong {
    font-size: var(--font-size-sm);
  }

  .warning-content p {
    font-size: 13px;
    line-height: 1.3;
  }

  /* Subtle dropzone "or" text */
  .dropzone-or {
    font-size: 12px;
    color: var(--gray-500);
  }

  /* Make browse button more prominent on mobile */
  #browseFilesBtn {
    padding: var(--spacing-sm) var(--spacing-lg);
    font-weight: 600;
  }
}

/* ============================================================================
   BROWSE COURSES PAGE
   ============================================================================ */

.browse-courses-container {
  max-width: 1200px;
  margin: 0 auto;
  padding: var(--spacing-lg) var(--spacing-md);
}

/* Page Header */
.page-header {
  margin-bottom: var(--spacing-xl);
}

.page-header-content {
  display: flex;
  flex-direction: column;
  gap: var(--spacing-sm);
}

.back-link {
  color: var(--primary-color);
  text-decoration: none;
  font-size: var(--font-size-sm);
  font-weight: 500;
  transition: color var(--transition-fast);
  display: inline-flex;
  align-items: center;
  gap: var(--spacing-xs);
}

.back-link:hover {
  color: var(--primary-hover);
  text-decoration: underline;
}

.page-title {
  font-size: var(--font-size-3xl);
  font-weight: 700;
  color: var(--gray-900);
  margin: 0;
}

.page-subtitle {
  font-size: var(--font-size-base);
  color: var(--gray-600);
  margin: 0;
}

/* Search Bar */
.search-bar {
  display: flex;
  gap: var(--spacing-md);
  margin-bottom: var(--spacing-xl);
  align-items: stretch;
}

.search-input {
  flex: 1;
  padding: 12px 16px;
  border: 1px solid var(--border-color);
  border-radius: var(--border-radius-lg);
  font-size: var(--font-size-base);
  font-family: var(--font-family);
  transition: border-color var(--transition-fast), box-shadow var(--transition-fast);
}

.search-input:focus {
  outline: none;
  border-color: var(--primary-color);
  box-shadow: 0 0 0 3px rgba(59, 130, 246, 0.1);
}

.search-input::placeholder {
  color: var(--gray-400);
}

/* Browse Layout (sidebar + grid) */
.browse-layout {
  display: flex;
  gap: var(--spacing-lg);
  align-items: flex-start;
}

.browse-main {
  flex: 1;
  min-width: 0;
}

/* Category Sidebar */
.category-sidebar {
  width: 220px;
  flex-shrink: 0;
  background: var(--white);
  border: 1px solid var(--gray-200);
  border-radius: var(--border-radius-lg);
  padding: var(--spacing-md);
}

.category-sidebar-title {
  font-size: var(--font-size-sm);
  font-weight: 700;
  text-transform: uppercase;
  letter-spacing: 0.05em;
  color: var(--gray-500);
  margin-bottom: var(--spacing-sm);
}

.category-filter-list {
  list-style: none;
  padding: 0;
  margin: 0;
}

.category-filter-item {
  margin-bottom: 2px;
}

.category-filter-btn {
  display: flex;
  align-items: center;
  justify-content: space-between;
  width: 100%;
  padding: 6px 10px;
  border: none;
  background: none;
  border-radius: var(--border-radius);
  font-size: var(--font-size-sm);
  color: var(--gray-700);
  cursor: pointer;
  text-align: left;
}

.category-filter-btn:hover {
  background: var(--gray-100);
}

.category-filter-btn.active {
  background: var(--primary-color);
  color: var(--white);
  font-weight: 600;
}

.category-filter-btn.active .category-filter-count {
  color: rgba(255,255,255,0.8);
}

.category-filter-count {
  font-size: var(--font-size-xs);
  color: var(--gray-400);
  margin-left: 4px;
}

.category-filter-parent {
  font-weight: 600;
  font-size: var(--font-size-xs);
  text-transform: uppercase;
  letter-spacing: 0.04em;
  color: var(--gray-400);
  padding: 8px 10px 4px;
  pointer-events: none;
}

.category-filter-parent:first-child {
  padding-top: 0;
}

/* Category Badges on Course Cards */
.category-badges {
  display: flex;
  flex-wrap: wrap;
  gap: 4px;
  margin-bottom: var(--spacing-sm);
}

.category-badge {
  display: inline-block;
  padding: 2px 8px;
  background: var(--gray-100);
  color: var(--gray-600);
  border-radius: 12px;
  font-size: var(--font-size-xs);
  font-weight: 500;
  line-height: 1.4;
}

@media (max-width: 768px) {
  .browse-layout {
    flex-direction: column;
  }

  .category-sidebar {
    width: 100%;
    margin-bottom: var(--spacing-sm);
  }

  .category-filter-list {
    display: flex;
    flex-wrap: wrap;
    gap: 4px;
  }

  .category-filter-item {
    margin-bottom: 0;
  }

  .category-filter-parent {
    width: 100%;
    padding: 4px 10px 2px;
  }
}

/* Course Grid */
.course-grid {
  display: grid;
  grid-template-columns: repeat(auto-fill, minmax(320px, 1fr));
  gap: var(--spacing-lg);
  margin-bottom: var(--spacing-xl);
}

/* Course Card */
.course-card {
  background: var(--white);
  border: 1px solid var(--gray-200);
  border-radius: var(--border-radius-lg);
  padding: var(--spacing-lg);
  display: flex;
  flex-direction: column;
  gap: var(--spacing-md);
  transition: all var(--transition-base);
  cursor: pointer;
}

.course-card:hover {
  box-shadow: var(--shadow-md);
  transform: translateY(-2px);
  border-color: var(--gray-300);
}

.course-card:focus {
  outline: 2px solid var(--primary-color);
  outline-offset: 2px;
}

.course-card-header {
  display: flex;
  justify-content: space-between;
  align-items: flex-start;
  gap: var(--spacing-md);
}

.course-title {
  margin: 0;
  font-size: var(--font-size-xl);
  font-weight: 600;
  color: var(--gray-900);
  flex: 1;
  line-height: 1.3;
}

/* Course Description */
.course-description {
  color: var(--gray-600);
  font-size: var(--font-size-sm);
  line-height: 1.6;
  margin: 0;
  display: -webkit-box;
  -webkit-line-clamp: 3;
  -webkit-box-orient: vertical;
  overflow: hidden;
  min-height: 3.6em; /* Reserve space for 3 lines */
}

/* Course Metadata */
.course-meta {
  display: flex;
  flex-direction: column;
  gap: var(--spacing-xs);
  padding-top: var(--spacing-sm);
  border-top: 1px solid var(--gray-200);
}

.meta-item {
  display: flex;
  justify-content: space-between;
  align-items: center;
  font-size: var(--font-size-sm);
}

.meta-label {
  color: var(--gray-500);
  font-weight: 400;
}

.meta-value {
  color: var(--gray-900);
  font-weight: 500;
}

/* Level Badge */
.level-badge {
  padding: 4px 12px;
  border-radius: 12px;
  font-size: var(--font-size-xs);
  font-weight: 600;
  text-transform: capitalize;
  white-space: nowrap;
}

.level-badge.beginner {
  background: var(--success-color);
  color: var(--white);
}

.level-badge.intermediate {
  background: var(--warning-color);
  color: var(--white);
}

.level-badge.advanced {
  background: var(--danger-color);
  color: var(--white);
}

/* Course Card Footer */
.course-card-footer {
  margin-top: auto;
  padding-top: var(--spacing-sm);
}

.view-details-btn {
  width: 100%;
  padding: 10px 16px;
  font-size: var(--font-size-sm);
  font-weight: 600;
}

/* Empty State */
.empty-state {
  text-align: center;
  padding: var(--spacing-2xl) var(--spacing-lg);
  max-width: 500px;
  margin: 0 auto;
}

.empty-icon {
  font-size: 64px;
  margin-bottom: var(--spacing-md);
}

.empty-state h2 {
  color: var(--gray-900);
  font-size: var(--font-size-2xl);
  font-weight: 600;
  margin-bottom: var(--spacing-sm);
}

.empty-state p {
  color: var(--gray-600);
  font-size: var(--font-size-base);
  margin-bottom: var(--spacing-lg);
  line-height: 1.6;
}

/* Loading State */
.loading-state {
  text-align: center;
  padding: var(--spacing-2xl) var(--spacing-lg);
}

.spinner {
  border: 4px solid var(--gray-200);
  border-top: 4px solid var(--primary-color);
  border-radius: 50%;
  width: 48px;
  height: 48px;
  animation: spin 1s linear infinite;
  margin: 0 auto var(--spacing-md);
}

@keyframes spin {
  0% { transform: rotate(0deg); }
  100% { transform: rotate(360deg); }
}

.loading-state p {
  color: var(--gray-600);
  font-size: var(--font-size-base);
}

/* Error State */
.error-state {
  text-align: center;
  padding: var(--spacing-2xl) var(--spacing-lg);
  max-width: 500px;
  margin: 0 auto;
}

.error-icon {
  font-size: 64px;
  margin-bottom: var(--spacing-md);
}

.error-state h2 {
  color: var(--gray-900);
  font-size: var(--font-size-2xl);
  font-weight: 600;
  margin-bottom: var(--spacing-sm);
}

.error-state p {
  color: var(--gray-600);
  font-size: var(--font-size-base);
  margin-bottom: var(--spacing-lg);
  line-height: 1.6;
}

/* Responsive - Mobile */
@media (max-width: 768px) {
  .browse-courses-container {
    padding: var(--spacing-md) var(--spacing-sm);
  }

  .course-grid {
    grid-template-columns: 1fr;
    gap: var(--spacing-md);
  }

  .search-bar {
    flex-direction: column;
    gap: var(--spacing-sm);
  }

  .search-input {
    width: 100%;
  }

  .page-title {
    font-size: var(--font-size-2xl);
  }

  .page-subtitle {
    font-size: var(--font-size-sm);
  }

  .course-card {
    padding: var(--spacing-md);
  }

  .course-title {
    font-size: var(--font-size-lg);
  }

  .empty-state,
  .error-state {
    padding: var(--spacing-xl) var(--spacing-md);
  }

  .empty-icon,
  .error-icon {
    font-size: 48px;
  }
}

/* Responsive - Tablet */
@media (min-width: 769px) and (max-width: 1024px) {
  .course-grid {
    grid-template-columns: repeat(2, 1fr);
  }
}

/* ============================================================================
   COURSE SETTINGS PAGE
   ============================================================================ */

.course-settings-container {
  max-width: 900px;
  margin: 0 auto;
  padding: var(--spacing-lg) var(--spacing-md);
}

/* Settings Card */
.settings-card {
  background: var(--white);
  border: 1px solid var(--gray-200);
  border-radius: var(--border-radius-lg);
  padding: var(--spacing-lg);
  margin-bottom: var(--spacing-lg);
}

.settings-card-header {
  display: flex;
  justify-content: space-between;
  align-items: center;
  margin-bottom: var(--spacing-md);
  padding-bottom: var(--spacing-md);
  border-bottom: 1px solid var(--gray-200);
}

.settings-card-header h2 {
  margin: 0;
  font-size: var(--font-size-xl);
  font-weight: 600;
  color: var(--gray-900);
}

.settings-card-body {
  display: flex;
  flex-direction: column;
  gap: var(--spacing-md);
}

/* Danger Zone Card */
.settings-card-danger {
  border-color: var(--danger-color);
  background: #FEF2F2;
}

.settings-card-danger .settings-card-header {
  border-bottom-color: var(--danger-color);
}

.settings-card-danger .settings-card-header h2 {
  color: var(--danger-color);
}

/* Save Indicator */
.save-indicator {
  font-size: var(--font-size-sm);
  font-weight: 500;
  padding: 4px 12px;
  border-radius: 12px;
  transition: all var(--transition-fast);
}

.save-indicator.saving {
  color: var(--gray-600);
  background: var(--gray-100);
}

.save-indicator.saving::after {
  content: '...';
  animation: ellipsis 1.5s infinite;
}

@keyframes ellipsis {
  0% { content: ''; }
  33% { content: '.'; }
  66% { content: '..'; }
  100% { content: '...'; }
}

.save-indicator.saved {
  color: var(--success-color);
  background: #ECFDF5;
}

.save-indicator.error {
  color: var(--danger-color);
  background: #FEF2F2;
}

/* Form Elements */
.form-label {
  display: flex;
  flex-direction: column;
  gap: var(--spacing-xs);
  font-weight: 500;
  color: var(--gray-700);
  font-size: var(--font-size-sm);
}

.form-hint {
  font-weight: 400;
  color: var(--gray-500);
  font-size: var(--font-size-xs);
}

.form-textarea {
  width: 100%;
  padding: 12px 16px;
  border: 1px solid var(--border-color);
  border-radius: var(--border-radius-lg);
  font-size: var(--font-size-base);
  font-family: var(--font-family);
  line-height: 1.5;
  resize: vertical;
  transition: border-color var(--transition-fast), box-shadow var(--transition-fast);
}

.form-textarea:focus {
  outline: none;
  border-color: var(--primary-color);
  box-shadow: 0 0 0 3px rgba(59, 130, 246, 0.1);
}

.form-textarea::placeholder {
  color: var(--gray-400);
}

/* Settings Description/Hint Text */
.settings-description {
  margin: 0;
  font-size: var(--font-size-base);
  font-weight: 500;
  color: var(--gray-700);
}

.settings-hint {
  margin: 0;
  font-size: var(--font-size-sm);
  color: var(--gray-500);
}

/* Radio Group */
.radio-group {
  display: flex;
  flex-direction: column;
  gap: var(--spacing-md);
}

.radio-option {
  display: flex;
  align-items: flex-start;
  gap: var(--spacing-md);
  padding: var(--spacing-md);
  border: 2px solid var(--gray-200);
  border-radius: var(--border-radius-lg);
  cursor: pointer;
  transition: all var(--transition-fast);
}

.radio-option:hover {
  border-color: var(--gray-300);
  background: var(--gray-50);
}

.radio-option input[type="radio"] {
  margin-top: 2px;
  width: 20px;
  height: 20px;
  cursor: pointer;
}

.radio-option input[type="radio"]:checked {
  accent-color: var(--primary-color);
}

.radio-option:has(input:checked) {
  border-color: var(--primary-color);
  background: var(--primary-light);
}

.radio-option-disabled {
  opacity: 0.6;
  cursor: not-allowed;
}

.radio-option-disabled:hover {
  border-color: var(--gray-200);
  background: transparent;
}

.radio-content {
  flex: 1;
  display: flex;
  flex-direction: column;
  gap: var(--spacing-xs);
}

.radio-title {
  font-weight: 600;
  color: var(--gray-900);
  font-size: var(--font-size-base);
  display: flex;
  align-items: center;
  gap: var(--spacing-sm);
}

.radio-description {
  font-size: var(--font-size-sm);
  color: var(--gray-600);
}

.radio-warning {
  margin-top: var(--spacing-xs);
  padding: var(--spacing-xs) var(--spacing-sm);
  background: #FEF3C7;
  border-left: 3px solid var(--warning-color);
  border-radius: var(--border-radius);
  font-size: var(--font-size-xs);
  color: var(--gray-700);
}

/* Badges */
.badge-coming-soon {
  display: inline-block;
  padding: 2px 8px;
  background: var(--gray-200);
  color: var(--gray-600);
  font-size: var(--font-size-xs);
  font-weight: 600;
  border-radius: 10px;
  text-transform: uppercase;
  letter-spacing: 0.5px;
}

/* Info Grid */
.info-grid {
  display: grid;
  grid-template-columns: repeat(2, 1fr);
  gap: var(--spacing-md);
}

.info-item {
  display: flex;
  justify-content: space-between;
  align-items: center;
  padding: var(--spacing-sm);
  background: var(--gray-50);
  border-radius: var(--border-radius);
}

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

.info-value {
  font-size: var(--font-size-sm);
  color: var(--gray-900);
  font-weight: 600;
}

/* Responsive - Mobile */
@media (max-width: 768px) {
  .course-settings-container {
    padding: var(--spacing-md) var(--spacing-sm);
  }

  .settings-card {
    padding: var(--spacing-md);
  }

  .settings-card-header {
    flex-direction: column;
    align-items: flex-start;
    gap: var(--spacing-sm);
  }

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

  .radio-option {
    padding: var(--spacing-sm);
  }
}

/* ============================================================================
   COURSE DETAIL PAGE
   ============================================================================ */

.course-detail-container {
  max-width: 1200px;
  margin: 0 auto;
  padding: var(--spacing-lg);
}

/* Course Detail Header */
.course-detail-header {
  background: var(--white);
  border-radius: var(--border-radius-lg);
  padding: var(--spacing-xl);
  margin-bottom: var(--spacing-xl);
  box-shadow: var(--shadow-md);
}

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

.course-header-title .page-title {
  margin: 0;
  flex: 1;
}

.course-header-meta {
  display: flex;
  align-items: center;
  gap: var(--spacing-sm);
  margin-bottom: var(--spacing-xl);
  font-size: var(--font-size-sm);
  color: var(--gray-600);
  flex-wrap: wrap;
}

.course-header-meta .meta-separator {
  color: var(--gray-400);
}

/* Two Column Layout */
.course-detail-two-column {
  display: grid;
  grid-template-columns: 2fr 1fr;
  gap: var(--spacing-xl);
  margin-bottom: var(--spacing-xl);
}

.course-description-column h2,
.course-about-column h2 {
  font-size: var(--font-size-lg);
  font-weight: 600;
  color: var(--gray-800);
  margin-bottom: var(--spacing-md);
}

.course-description-column p {
  color: var(--gray-700);
  line-height: 1.6;
}

.course-about-column {
  background: var(--gray-50);
  padding: var(--spacing-lg);
  border-radius: var(--border-radius-lg);
  border: 1px solid var(--gray-200);
}

.about-info {
  display: flex;
  flex-direction: column;
  gap: var(--spacing-md);
}

.about-item {
  display: flex;
  flex-direction: column;
  gap: var(--spacing-xs);
}

.about-label {
  font-size: var(--font-size-xs);
  color: var(--gray-600);
  font-weight: 500;
  text-transform: uppercase;
  letter-spacing: 0.5px;
}

.about-value {
  font-size: var(--font-size-base);
  color: var(--gray-900);
  font-weight: 500;
}

/* Enrollment Section */
.course-enroll-section {
  display: flex;
  flex-direction: column;
  align-items: center;
  gap: var(--spacing-md);
  padding-top: var(--spacing-lg);
  border-top: 1px solid var(--gray-200);
}

.btn-large {
  padding: var(--spacing-md) var(--spacing-2xl);
  font-size: var(--font-size-lg);
  font-weight: 600;
}

.enrolled-status {
  display: flex;
  align-items: center;
  gap: var(--spacing-md);
  padding: var(--spacing-md) var(--spacing-lg);
  background: var(--success-color);
  color: var(--white);
  border-radius: var(--border-radius-lg);
  font-weight: 500;
}

.enrolled-checkmark {
  font-size: var(--font-size-2xl);
  font-weight: bold;
}

.enrolled-status .btn-secondary {
  background: var(--white);
  color: var(--success-color);
  border: none;
  margin-left: var(--spacing-md);
}

.enrolled-status .btn-secondary:hover {
  background: var(--gray-100);
}

/* Course Outline Section */
.course-outline-section {
  background: var(--white);
  border-radius: var(--border-radius-lg);
  padding: var(--spacing-xl);
  box-shadow: var(--shadow-md);
}

.course-outline-section .section-title {
  font-size: var(--font-size-2xl);
  font-weight: 600;
  color: var(--gray-800);
  margin-bottom: var(--spacing-lg);
}

/* Curriculum tree styles are already defined above and will be used */

/* Responsive - Tablet */
@media (max-width: 900px) {
  .course-detail-two-column {
    grid-template-columns: 1fr;
    gap: var(--spacing-lg);
  }

  .course-about-column {
    order: -1; /* Move about section above description on mobile */
  }
}

/* Responsive - Mobile */
@media (max-width: 768px) {
  .course-detail-container {
    padding: var(--spacing-md) var(--spacing-sm);
  }

  .course-detail-header {
    padding: var(--spacing-lg);
  }

  .course-header-title {
    flex-direction: column;
    align-items: flex-start;
    gap: var(--spacing-sm);
  }

  .course-header-meta {
    font-size: var(--font-size-xs);
  }

  .course-outline-section {
    padding: var(--spacing-lg);
  }

  .btn-large {
    padding: var(--spacing-md) var(--spacing-xl);
    font-size: var(--font-size-base);
    width: 100%;
  }

  .enrolled-status {
    flex-direction: column;
    text-align: center;
  }
}

/* ========================================
   Course Analytics Page
   ======================================== */

.analytics-container {
  max-width: 1200px;
  margin: 0 auto;
}

.analytics-section {
  margin-bottom: var(--spacing-xl);
}

.section-title {
  font-size: var(--font-size-xl);
  font-weight: 600;
  color: var(--gray-900);
  margin-bottom: var(--spacing-md);
}

.section-description {
  color: var(--gray-600);
  font-size: var(--font-size-sm);
  margin-bottom: var(--spacing-md);
}

.stat-cards {
  display: grid;
  grid-template-columns: repeat(auto-fit, minmax(200px, 1fr));
  gap: var(--spacing-md);
  margin-bottom: var(--spacing-lg);
}

.stat-cards.placeholder-section {
  margin-top: var(--spacing-md);
}

.stat-card.placeholder {
  opacity: 0.6;
  background: var(--gray-50);
}

.stat-note {
  font-size: var(--font-size-xs);
  color: var(--gray-500);
  margin-top: var(--spacing-xs);
  font-style: italic;
}

.table-container {
  overflow-x: auto;
  background: var(--white);
  border: 1px solid var(--gray-200);
  border-radius: 8px;
  padding: var(--spacing-md);
}

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

.analytics-table thead {
  background: var(--gray-50);
  border-bottom: 2px solid var(--gray-200);
}

.analytics-table th {
  padding: var(--spacing-sm) var(--spacing-md);
  text-align: left;
  font-weight: 600;
  color: var(--gray-700);
  white-space: nowrap;
}

.analytics-table td {
  padding: var(--spacing-sm) var(--spacing-md);
  border-bottom: 1px solid var(--gray-100);
  color: var(--gray-900);
}

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

.analytics-table tbody tr:hover {
  background: var(--gray-50);
}

.analytics-table .progress-bar-container {
  position: relative;
  width: 100%;
  min-width: 100px;
  max-width: 200px;
  height: 28px;
  background: #e5e7eb;
  border-radius: 4px;
  overflow: visible;
  border: 1px solid #d1d5db;
  margin: 0;
}

.analytics-table .progress-bar {
  position: absolute;
  left: 0;
  top: 0;
  height: 100%;
  background: #3b82f6;
  border-radius: 3px;
  transition: width 0.3s ease;
  z-index: 1;
}

.analytics-table .progress-text {
  position: absolute;
  left: 0;
  right: 0;
  top: 0;
  bottom: 0;
  display: flex;
  align-items: center;
  justify-content: center;
  font-size: 13px;
  font-weight: 700;
  color: #111827;
  z-index: 2;
  pointer-events: none;
  line-height: 1;
  padding-bottom: 1px;
  margin: 0;
}

@media (max-width: 768px) {
  .analytics-container {
    padding: var(--spacing-md);
  }

  .stat-cards {
    grid-template-columns: 1fr;
  }

  .section-title {
    font-size: var(--font-size-lg);
  }

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

  .analytics-table {
    font-size: var(--font-size-xs);
  }

  .analytics-table th,
  .analytics-table td {
    padding: var(--spacing-xs) var(--spacing-sm);
  }

  .analytics-table th {
    font-size: var(--font-size-xs);
  }

  .progress-bar-container {
    min-width: 60px;
    height: 20px;
  }
}