/* =================================================================
   View-Specific Styles
   Auth, Admin, Instructor, Student interfaces
   ================================================================= */

/* =================================================================
   Global Toast Notifications
   ================================================================= */

.toast-container {
  position: fixed;
  top: var(--space-4);
  left: var(--space-3);
  right: var(--space-3);
  z-index: 10000;
  display: flex;
  flex-direction: column;
  gap: var(--space-3);
  max-width: none;
  pointer-events: none;
}

@media (min-width: 769px) {
  .toast-container {
    left: auto;
    max-width: 380px;
  }
}

.toast {
  pointer-events: auto;
  display: flex;
  align-items: center;
  justify-content: space-between;
  gap: var(--space-3);
  padding: var(--space-3) var(--space-4);
  border-radius: var(--radius-lg);
  font-size: var(--text-sm);
  font-weight: 500;
  box-shadow: var(--shadow-lg);
  transition: opacity 0.3s, transform 0.3s;
}

.toast-info {
  background: var(--color-brand-primary);
  color: #fff;
}

.toast-success {
  background: var(--color-success);
  color: #fff;
}

.toast-error {
  background: var(--color-error);
  color: #fff;
}

.toast-close {
  background: none;
  border: none;
  color: inherit;
  font-size: var(--text-lg);
  cursor: pointer;
  opacity: 0.7;
  padding: 0;
  line-height: 1;
}

.toast-close:hover {
  opacity: 1;
}

/* =================================================================
   Views
   ================================================================= */

.view-wrapper {
  min-height: calc(100vh - 56px);
  padding-block: var(--space-6);
  animation: fadeIn var(--duration-base) var(--ease-smooth);
}

@media (min-width: 769px) {
  .view-wrapper {
    min-height: calc(100vh - 72px);
    padding-block: var(--space-12);
  }
}

/* =================================================================
   Theme Toggle Button
   ================================================================= */

.btn-icon {
  display: inline-flex;
  align-items: center;
  justify-content: center;
  width: 2.5rem;
  height: 2.5rem;
  padding: 0;
  border: none;
  border-radius: var(--radius-md);
  background: transparent;
  color: var(--color-text-secondary);
  cursor: pointer;
  transition: all var(--duration-fast) var(--ease-smooth);
}

.btn-icon:hover {
  background: var(--color-surface-sunken);
  color: var(--color-text-primary);
}

.theme-icon {
  width: 1.25rem;
  height: 1.25rem;
  display: none;
}

/* Show sun icon in dark mode, moon icon in light mode */
html[data-theme="dark"] .sun-icon {
  display: block;
}

html[data-theme="light"] .moon-icon {
  display: block;
}

/* Default to light theme if no attribute is set */
html:not([data-theme]) .moon-icon {
  display: block;
}

/* =================================================================
   Auth View
   ================================================================= */

.auth-container {
  max-width: 480px;
  margin-inline: auto;
  padding-block: var(--space-4);
}

@media (min-width: 769px) {
  .auth-container {
    padding-block: var(--space-8);
  }
}

.auth-header {
  text-align: center;
  margin-bottom: var(--space-8);
}

.auth-header h2 {
  margin-bottom: var(--space-2);
  font-size: var(--text-xl);
}

@media (min-width: 769px) {
  .auth-header h2 {
    font-size: var(--text-2xl);
  }
}

.auth-tabs {
  display: flex;
  gap: var(--space-2);
  padding: var(--space-1);
  background: var(--color-surface-sunken);
  border-radius: var(--radius-lg);
  margin-bottom: var(--space-6);
}

.auth-tab {
  flex: 1;
  padding: var(--space-3);
  font-size: var(--text-sm);
  font-weight: 600;
  font-family: inherit;
  border: none;
  background: transparent;
  color: var(--color-text-secondary);
  border-radius: var(--radius-md);
  cursor: pointer;
  transition: all var(--duration-fast) var(--ease-smooth);
}

.auth-tab.active {
  background: var(--color-surface-elevated);
  color: var(--color-brand-primary);
  box-shadow: var(--shadow-sm);
}

.auth-forms {
  position: relative;
}

.auth-form {
  display: none;
  flex-direction: column;
  gap: var(--space-5);
}

.auth-form.active {
  display: flex;
}

.auth-status {
  margin-top: var(--space-6);
  min-height: 24px;
  text-align: center;
}

/* Password Input with Toggle */
.password-input-wrapper {
  position: relative;
}

.password-input-wrapper .form-input {
  padding-right: 48px;
}

.password-toggle {
  position: absolute;
  right: 12px;
  top: 50%;
  transform: translateY(-50%);
  background: none;
  border: none;
  padding: 8px;
  cursor: pointer;
  color: var(--color-text-tertiary);
  display: flex;
  align-items: center;
  justify-content: center;
  transition: color var(--duration-fast);
  border-radius: var(--radius-md);
}

.password-toggle:hover {
  color: var(--color-text-primary);
  background: var(--color-surface-sunken);
}

.password-toggle .eye-icon {
  width: 20px;
  height: 20px;
  stroke-width: 2;
}

.forgot-password-link {
  display: inline-block;
  margin-top: var(--space-2);
  font-size: var(--text-sm);
  color: var(--color-brand-primary);
  text-decoration: none;
  transition: color var(--duration-fast);
}

.forgot-password-link:hover {
  color: var(--color-accent-rust);
  text-decoration: underline;
}

/* =================================================================
   Dashboard Layout (shared by all roles)
   ================================================================= */

.dashboard-layout {
  display: grid;
  grid-template-columns: 1fr;
  gap: var(--space-4);
}

@media (min-width: 1025px) {
  .dashboard-layout {
    grid-template-columns: 260px 1fr;
    gap: var(--space-6);
    min-height: calc(100vh - 72px);
  }
}

.dashboard-sidebar {
  padding: var(--space-4);
  background: var(--color-surface-elevated);
  border: 1px solid var(--color-border-subtle);
  border-radius: var(--radius-xl);
}

@media (min-width: 1025px) {
  .dashboard-sidebar {
    position: sticky;
    top: 88px;
    height: fit-content;
    padding: var(--space-6);
  }
}

.sidebar-menu {
  display: flex;
  flex-direction: column;
  gap: var(--space-1);
}

.sidebar-link {
  display: flex;
  align-items: center;
  gap: var(--space-3);
  padding: var(--space-3) var(--space-4);
  font-size: var(--text-sm);
  font-weight: 500;
  color: var(--color-text-secondary);
  text-decoration: none;
  border-radius: var(--radius-md);
  transition: all var(--duration-fast) var(--ease-smooth);
}

.sidebar-link:hover {
  background: var(--color-surface-sunken);
  color: var(--color-text-primary);
}

.sidebar-link.active {
  background: var(--color-accent-sand);
  color: var(--color-brand-primary);
  font-weight: 600;
}

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

.dashboard-main {
  padding-bottom: var(--space-10);
}

.dashboard-header {
  margin-bottom: var(--space-8);
}

.dashboard-header h2 {
  margin-bottom: var(--space-2);
}

.dashboard-header .text-muted {
  font-size: var(--text-lg);
}

/* =================================================================
   Admin View - User Management
   ================================================================= */

.users-table-container {
  background: var(--color-surface-elevated);
  border: 1px solid var(--color-border-subtle);
  border-radius: var(--radius-xl);
  overflow-x: auto;
  -webkit-overflow-scrolling: touch;
}

.users-table {
  width: 100%;
  border-collapse: collapse;
}

.users-table th,
.users-table td {
  padding: var(--space-3) var(--space-2);
  text-align: left;
  border-bottom: 1px solid var(--color-border-subtle);
  font-size: var(--text-xs);
}

@media (min-width: 769px) {
  .users-table th,
  .users-table td {
    padding: var(--space-4);
    font-size: var(--text-sm);
  }
}

.users-table thead {
  background: var(--color-surface-sunken);
}

.users-table th {
  font-size: var(--text-xs);
  font-weight: 600;
  text-transform: uppercase;
  letter-spacing: 0.05em;
  color: var(--color-text-tertiary);
}

.users-table tbody tr {
  transition: background var(--duration-fast);
}

.users-table tbody tr:hover {
  background: var(--color-surface-sunken);
}

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

.user-avatar {
  width: 40px;
  height: 40px;
  border-radius: var(--radius-full);
  background: var(--color-accent-sand);
  display: flex;
  align-items: center;
  justify-content: center;
  font-weight: 600;
  font-size: var(--text-sm);
  color: var(--color-brand-primary);
}

.role-tags {
  display: flex;
  flex-wrap: wrap;
  gap: var(--space-2);
}

.action-buttons {
  display: flex;
  flex-direction: column;
  gap: var(--space-1);
}

@media (min-width: 600px) {
  .action-buttons {
    flex-direction: row;
    gap: var(--space-2);
  }
}

/* =================================================================
   Instructor View - Course Management
   ================================================================= */

.course-grid {
  display: grid;
  grid-template-columns: 1fr;
  gap: var(--space-4);
}

@media (min-width: 600px) {
  .course-grid {
    grid-template-columns: repeat(auto-fill, minmax(280px, 1fr));
    gap: var(--space-6);
  }
}

.course-card {
  background: var(--color-surface-elevated);
  border: 1px solid var(--color-border-subtle);
  border-radius: var(--radius-xl);
  overflow: hidden;
  transition: all var(--duration-base) var(--ease-smooth);
  display: flex;
  flex-direction: column;
  cursor: pointer;
}

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

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

.course-actions {
  opacity: 0;
  transition: opacity var(--duration-fast) var(--ease-smooth);
  display: flex;
  flex-direction: column;
  gap: var(--space-2);
}

@media (min-width: 600px) {
  .course-actions {
    flex-direction: row;
  }
}

@media (hover: none) {
  .course-actions {
    opacity: 1;
  }
}

.course-thumbnail {
  width: 100%;
  aspect-ratio: 2 / 1;
  background: linear-gradient(135deg, var(--color-accent-sand) 0%, var(--color-brand-primary) 100%);
  display: flex;
  align-items: center;
  justify-content: center;
  font-size: var(--text-3xl);
  font-weight: 700;
  color: white;
  position: relative;
}

@media (min-width: 600px) {
  .course-thumbnail {
    aspect-ratio: 16 / 9;
  }
}

.course-thumbnail::after {
  content: '';
  position: absolute;
  inset: 0;
  background: linear-gradient(180deg, transparent 0%, rgba(0,0,0,0.3) 100%);
}

.course-body {
  padding: var(--space-5);
  flex: 1;
  display: flex;
  flex-direction: column;
}

.course-body .text-muted {
  flex: 1;
}

.btn-block {
  display: block;
  width: 100%;
  text-align: center;
}

.course-title {
  font-size: var(--text-lg);
  font-weight: 600;
  margin-bottom: var(--space-2);
}

.course-meta {
  display: flex;
  align-items: center;
  gap: var(--space-4);
  margin-top: var(--space-4);
  padding-top: var(--space-4);
  border-top: 1px solid var(--color-border-subtle);
  font-size: var(--text-xs);
  color: var(--color-text-tertiary);
}

.course-create-card {
  background: var(--color-surface-sunken);
  border: 2px dashed var(--color-border-default);
  display: flex;
  flex-direction: column;
  align-items: center;
  justify-content: center;
  gap: var(--space-3);
  padding: var(--space-10);
  text-align: center;
  transition: all var(--duration-base) var(--ease-smooth);
}

.course-create-card:hover {
  background: var(--color-accent-sand);
  border-color: var(--color-brand-primary);
  border-style: solid;
}

.create-icon {
  width: 48px;
  height: 48px;
  background: var(--color-brand-primary);
  color: white;
  border-radius: var(--radius-full);
  display: flex;
  align-items: center;
  justify-content: center;
  font-size: var(--text-2xl);
  font-weight: 300;
}

/* Course Editor */
.course-editor {
  max-width: 900px;
  margin-inline: auto;
}

.editor-section {
  background: var(--color-surface-elevated);
  border: 1px solid var(--color-border-subtle);
  border-radius: var(--radius-xl);
  padding: var(--space-4);
  margin-bottom: var(--space-4);
}

@media (min-width: 769px) {
  .editor-section {
    padding: var(--space-6);
    margin-bottom: var(--space-6);
  }
}

.section-header {
  display: flex;
  align-items: center;
  justify-content: space-between;
  margin-bottom: var(--space-6);
  padding-bottom: var(--space-4);
  border-bottom: 1px solid var(--color-border-subtle);
}

.lessons-list {
  display: flex;
  flex-direction: column;
  gap: var(--space-3);
}

.lesson-item {
  display: flex;
  align-items: flex-start;
  flex-wrap: wrap;
  gap: var(--space-2);
  padding: var(--space-3);
  background: var(--color-surface-sunken);
  border: 1px solid var(--color-border-subtle);
  border-radius: var(--radius-lg);
  transition: all var(--duration-fast);
}

@media (min-width: 600px) {
  .lesson-item {
    align-items: center;
    flex-wrap: nowrap;
    gap: var(--space-4);
    padding: var(--space-4);
  }
}

.lesson-item:hover {
  border-color: var(--color-border-default);
  box-shadow: var(--shadow-sm);
}

.lesson-drag-handle {
  cursor: grab;
  color: var(--color-text-tertiary);
  font-size: var(--text-lg);
}

.lesson-content {
  flex: 1;
}

.lesson-title {
  font-weight: 600;
  margin-bottom: var(--space-1);
}

.lesson-meta {
  font-size: var(--text-xs);
  color: var(--color-text-tertiary);
}

/* Course Module Styles */
.modules-list {
  display: flex;
  flex-direction: column;
  gap: var(--space-4);
}

.module-item {
  /* Module styles applied inline in renderCourseEditor */
}

.module-header {
  /* Module header styles applied inline in renderCourseEditor */
}

/* =================================================================
   Student View - Learning Interface
   ================================================================= */

/* Dashboard Stats Grid */
.stats-grid {
  display: grid;
  grid-template-columns: 1fr;
  gap: var(--space-3);
  margin-bottom: var(--space-6);
}

@media (min-width: 480px) {
  .stats-grid {
    grid-template-columns: repeat(2, 1fr);
  }
}

@media (min-width: 769px) {
  .stats-grid {
    grid-template-columns: repeat(auto-fit, minmax(200px, 1fr));
    gap: var(--space-4);
    margin-bottom: var(--space-8);
  }
}

.stat-card {
  display: flex;
  align-items: center;
  gap: var(--space-3);
  background: var(--color-surface-elevated);
  border: 1px solid var(--color-border-subtle);
  border-radius: var(--radius-xl);
  padding: var(--space-4);
  transition: all var(--duration-base) var(--ease-smooth);
}

@media (min-width: 769px) {
  .stat-card {
    gap: var(--space-4);
    padding: var(--space-5);
  }
}

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

.stat-icon {
  width: 44px;
  height: 44px;
  display: flex;
  align-items: center;
  justify-content: center;
  border-radius: var(--radius-lg);
  color: white;
  flex-shrink: 0;
}

@media (min-width: 769px) {
  .stat-icon {
    width: 56px;
    height: 56px;
  }
}

.stat-content {
  flex: 1;
  min-width: 0;
}

.stat-label {
  font-size: var(--text-xs);
  color: var(--color-text-secondary);
  margin-bottom: var(--space-1);
}

@media (min-width: 769px) {
  .stat-label {
    font-size: var(--text-sm);
  }
}

.stat-value {
  font-size: var(--text-2xl);
  font-weight: 700;
  font-family: var(--font-display);
  color: var(--color-text-primary);
  line-height: 1;
}

@media (min-width: 769px) {
  .stat-value {
    font-size: var(--text-3xl);
  }
}

/* Section Headers */
.section-header {
  margin-bottom: var(--space-4);
}

.section-header h3 {
  margin-bottom: var(--space-1);
  font-size: var(--text-xl);
  font-weight: 600;
}

.section-header .text-muted {
  font-size: var(--text-sm);
}

/* Horizontal Course Cards */
.course-grid-horizontal {
  display: grid;
  grid-template-columns: 1fr;
  gap: var(--space-4);
  margin-bottom: var(--space-6);
}

@media (min-width: 700px) {
  .course-grid-horizontal {
    grid-template-columns: repeat(auto-fill, minmax(300px, 1fr));
  }
}

.course-card-horizontal {
  display: flex;
  flex-direction: column;
  gap: var(--space-3);
  background: var(--color-surface-elevated);
  border: 1px solid var(--color-border-subtle);
  border-radius: var(--radius-xl);
  padding: var(--space-4);
  cursor: pointer;
  transition: all var(--duration-base) var(--ease-smooth);
}

@media (min-width: 600px) {
  .course-card-horizontal {
    flex-direction: row;
    gap: var(--space-4);
  }
}

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

.course-thumbnail-sm {
  width: 100%;
  height: 100px;
  border-radius: var(--radius-lg);
  display: flex;
  align-items: center;
  justify-content: center;
  flex-shrink: 0;
  background: linear-gradient(135deg, var(--color-brand-primary), var(--color-brand-secondary));
  overflow: hidden;
}

@media (min-width: 600px) {
  .course-thumbnail-sm {
    width: 80px;
    height: 80px;
  }
}

/* Enhanced Dashboard Header */
.dashboard-header {
  display: flex;
  flex-direction: column;
  align-items: flex-start;
  margin-bottom: var(--space-6);
  gap: var(--space-3);
}

@media (min-width: 769px) {
  .dashboard-header {
    flex-direction: row;
    align-items: center;
    justify-content: space-between;
    margin-bottom: var(--space-8);
    gap: var(--space-4);
    flex-wrap: wrap;
  }
}

.dashboard-header h2 {
  margin-bottom: var(--space-1);
  font-size: var(--text-xl);
}

@media (min-width: 769px) {
  .dashboard-header h2 {
    font-size: var(--text-3xl);
  }
}

/* Course Search and Filter */
.course-filters {
  display: flex;
  flex-direction: column;
  gap: var(--space-3);
  align-items: stretch;
}

@media (min-width: 769px) {
  .course-filters {
    flex-direction: row;
    gap: var(--space-4);
    align-items: center;
    flex-wrap: wrap;
  }
}

.search-box {
  position: relative;
  flex: 1;
  min-width: 0;
}

@media (min-width: 769px) {
  .search-box {
    min-width: 280px;
  }
}

.search-input {
  width: 100%;
  padding: var(--space-3) var(--space-4) var(--space-3) var(--space-12);
  font-size: var(--text-base);
  font-family: inherit;
  border: 1px solid var(--color-border-default);
  border-radius: var(--radius-lg);
  background: var(--color-surface-elevated);
  color: var(--color-text-primary);
  transition: all var(--duration-base) var(--ease-smooth);
}

.search-input:focus {
  outline: none;
  border-color: var(--color-brand-primary);
  box-shadow: 0 0 0 3px rgba(234, 88, 12, 0.1);
}

.filter-buttons {
  display: flex;
  gap: var(--space-2);
  background: var(--color-surface-elevated);
  padding: var(--space-1);
  border-radius: var(--radius-lg);
  border: 1px solid var(--color-border-subtle);
  overflow-x: auto;
  -webkit-overflow-scrolling: touch;
  scrollbar-width: none;
  flex-wrap: nowrap;
}

.filter-buttons::-webkit-scrollbar {
  display: none;
}

.filter-btn {
  display: inline-flex;
  align-items: center;
  gap: var(--space-2);
  padding: var(--space-2) var(--space-3);
  font-size: var(--text-xs);
  font-weight: 500;
  font-family: inherit;
  border: none;
  background: transparent;
  color: var(--color-text-secondary);
  border-radius: var(--radius-md);
  cursor: pointer;
  transition: all var(--duration-fast) var(--ease-smooth);
  white-space: nowrap;
}

@media (min-width: 769px) {
  .filter-btn {
    padding: var(--space-2) var(--space-4);
    font-size: var(--text-sm);
  }
}

.filter-btn:hover {
  background: var(--color-surface-sunken);
  color: var(--color-text-primary);
}

.filter-btn.active {
  background: var(--color-brand-primary);
  color: white;
}

.filter-count {
  display: inline-flex;
  align-items: center;
  justify-content: center;
  min-width: 20px;
  height: 20px;
  padding: 0 6px;
  font-size: var(--text-xs);
  font-weight: 600;
  border-radius: var(--radius-full);
  background: rgba(255, 255, 255, 0.2);
}

.filter-btn.active .filter-count {
  background: rgba(255, 255, 255, 0.25);
}

/* Lesson Header */
.lesson-header {
  margin-bottom: var(--space-4);
}

.lesson-header-meta {
  display: flex;
  align-items: center;
  gap: var(--space-2);
  margin-bottom: var(--space-1);
  font-size: var(--text-xs);
  color: var(--color-text-tertiary);
}

.lesson-header-course {
  font-weight: 600;
  color: var(--color-brand-primary);
}

.lesson-header-position {
  opacity: 0.7;
}

.lesson-header-meta .lesson-header-course::after {
  content: '·';
  margin-left: var(--space-2);
  color: var(--color-text-tertiary);
}

.lesson-header-title {
  font-size: var(--text-lg);
  font-weight: 700;
  line-height: 1.3;
  color: var(--color-text-primary);
  margin: 0;
}

@media (min-width: 769px) {
  .lesson-header-title {
    font-size: var(--text-xl);
  }
}

/* Classroom Layout */
.classroom-layout {
  display: grid;
  grid-template-columns: 1fr;
  gap: var(--space-4);
}

@media (min-width: 1025px) {
  .classroom-layout {
    grid-template-columns: 1fr 360px;
    gap: var(--space-6);
  }
}

.video-player {
  background: #000;
  aspect-ratio: 16 / 9;
  border-radius: var(--radius-xl);
  overflow: hidden;
  position: relative;
}

.video-placeholder {
  width: 100%;
  height: 100%;
  display: flex;
  align-items: center;
  justify-content: center;
  background: linear-gradient(135deg, #1a1816 0%, #2d2a26 100%);
  color: white;
}

.lesson-content-area {
  background: var(--color-surface-elevated);
  border: 1px solid var(--color-border-subtle);
  border-radius: var(--radius-xl);
  padding: var(--space-4);
}

@media (min-width: 769px) {
  .lesson-content-area {
    padding: var(--space-6);
  }
}

.lesson-content-area h3 {
  margin-bottom: var(--space-4);
}

.lesson-nav-buttons {
  display: flex;
  flex-direction: column;
  gap: var(--space-3);
  margin-top: var(--space-4);
}

@media (min-width: 480px) {
  .lesson-nav-buttons {
    flex-direction: row;
    justify-content: space-between;
    gap: var(--space-4);
  }
}

/* Mobile lesson list toggle */
.mobile-lessons-toggle {
  display: flex;
  align-items: center;
  justify-content: center;
  gap: var(--space-2);
  width: 100%;
  margin-top: var(--space-3);
  padding: var(--space-3);
  background: var(--color-surface-elevated);
  border: 1px solid var(--color-border-subtle);
  border-radius: var(--radius-lg);
  cursor: pointer;
  font-size: var(--text-sm);
  font-weight: 600;
  color: var(--color-brand-primary);
  transition: background 0.2s;
}

.mobile-lessons-toggle:hover {
  background: var(--color-surface-sunken);
}

@media (min-width: 1025px) {
  .mobile-lessons-toggle {
    display: none;
  }
}

/* On mobile, sidebar hidden by default, shown when toggled */
.sidebar-panel.mobile-hidden {
  display: none;
}

@media (min-width: 1025px) {
  .sidebar-panel.mobile-hidden {
    display: block;
  }
}

.lesson-nav-buttons .btn {
  flex: 1;
  min-width: 0;
}

@media (min-width: 480px) {
  .lesson-nav-buttons .btn {
    max-width: 180px;
  }
}

.lesson-nav-buttons .btn:disabled {
  opacity: 0.4;
  cursor: not-allowed;
}

.btn-success {
  background: var(--color-success);
  color: #fff;
  border-color: var(--color-success);
}

.btn-success:hover {
  opacity: 0.9;
}

.lesson-number.completed {
  background: var(--color-success);
  color: #fff;
  font-size: var(--text-xs);
  font-weight: 700;
}

/* Article Content Styles */
.article-content {
  font-size: var(--text-base);
  line-height: 1.7;
  color: var(--color-text-primary);
}

.article-content h1,
.article-content h2,
.article-content h3,
.article-content h4,
.article-content h5,
.article-content h6 {
  margin-top: var(--space-6);
  margin-bottom: var(--space-3);
  font-weight: 600;
  line-height: 1.3;
}

.article-content h1 { font-size: var(--text-3xl); }
.article-content h2 { font-size: var(--text-2xl); }
.article-content h3 { font-size: var(--text-xl); }
.article-content h4 { font-size: var(--text-lg); }

.article-content p {
  margin-bottom: var(--space-4);
}

.article-content ul,
.article-content ol {
  margin-bottom: var(--space-4);
  padding-left: var(--space-6);
}

.article-content li {
  margin-bottom: var(--space-2);
}

.article-content a {
  color: var(--color-brand-primary);
  text-decoration: underline;
}

.article-content a:hover {
  color: var(--color-accent-rust);
}

.article-content img {
  max-width: 100%;
  height: auto;
  border-radius: var(--radius-lg);
  margin: var(--space-4) 0;
}

.article-content blockquote {
  border-left: 4px solid var(--color-brand-primary);
  padding-left: var(--space-4);
  margin: var(--space-4) 0;
  font-style: italic;
  color: var(--color-text-secondary);
}

.article-content code {
  background: var(--color-surface-sunken);
  padding: 0.2em 0.4em;
  border-radius: var(--radius-sm);
  font-family: 'Courier New', monospace;
  font-size: 0.9em;
}

.article-content pre {
  background: var(--color-surface-sunken);
  padding: var(--space-4);
  border-radius: var(--radius-lg);
  overflow-x: auto;
  margin: var(--space-4) 0;
}

.article-content pre code {
  background: none;
  padding: 0;
}

.sidebar-panel {
  max-height: none;
  overflow-y: auto;
}

@media (min-width: 1025px) {
  .sidebar-panel {
    position: sticky;
    top: 88px;
    max-height: calc(100vh - 104px);
  }
}

.curriculum-list {
  background: var(--color-surface-elevated);
  border: 1px solid var(--color-border-subtle);
  border-radius: var(--radius-xl);
  overflow: hidden;
}

.curriculum-header {
  padding: var(--space-4);
  background: var(--color-surface-sunken);
  font-weight: 600;
  border-bottom: 1px solid var(--color-border-subtle);
}

.curriculum-item {
  display: flex;
  align-items: center;
  gap: var(--space-3);
  padding: var(--space-4);
  border-bottom: 1px solid var(--color-border-subtle);
  cursor: pointer;
  transition: all var(--duration-fast);
  text-decoration: none;
  color: inherit;
}

.curriculum-item:hover {
  background: var(--color-surface-sunken);
}

.curriculum-item.active {
  background: var(--color-accent-sand);
  color: var(--color-brand-primary);
  font-weight: 600;
}

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

.lesson-number {
  width: 32px;
  height: 32px;
  border-radius: var(--radius-full);
  background: var(--color-surface-sunken);
  display: flex;
  align-items: center;
  justify-content: center;
  font-weight: 600;
  font-size: var(--text-xs);
}

.curriculum-item.active .lesson-number {
  background: var(--color-brand-primary);
  color: white;
}

.lesson-info {
  flex: 1;
}

.lesson-duration {
  font-size: var(--text-xs);
  color: var(--color-text-tertiary);
}

/* Progress indicator */
.progress-bar {
  width: 100%;
  height: 8px;
  background: var(--color-surface-sunken);
  border-radius: var(--radius-full);
  overflow: hidden;
  margin-top: var(--space-4);
}

.progress-fill {
  height: 100%;
  background: linear-gradient(90deg, var(--color-brand-primary) 0%, var(--color-accent-rust) 100%);
  border-radius: var(--radius-full);
  transition: width var(--duration-slow) var(--ease-smooth);
}

/* Course Detail Hero */
.course-detail-hero {
  height: 160px !important;
}

@media (min-width: 769px) {
  .course-detail-hero {
    height: 220px !important;
  }
}

/* =================================================================
   Modal / Dialog
   ================================================================= */

.modal-overlay {
  position: fixed;
  inset: 0;
  background: rgba(26, 24, 22, 0.5);
  backdrop-filter: blur(4px);
  z-index: 100;
  display: flex;
  align-items: flex-end;
  justify-content: center;
  padding: 0;
  animation: fadeIn var(--duration-fast);
}

@media (min-width: 769px) {
  .modal-overlay {
    align-items: center;
    padding: var(--space-6);
  }
}

.modal {
  background: var(--color-surface-elevated);
  border-radius: var(--radius-xl) var(--radius-xl) 0 0;
  box-shadow: var(--shadow-xl);
  max-width: 100%;
  width: 100%;
  max-height: 90vh;
  overflow-y: auto;
  animation: slideUp var(--duration-base) var(--ease-smooth);
}

@media (min-width: 769px) {
  .modal {
    max-width: 600px;
    border-radius: var(--radius-2xl);
  }
}

.modal-large {
  max-width: 100%;
}

@media (min-width: 769px) {
  .modal-large {
    max-width: 900px;
  }
}

.modal-header {
  padding: var(--space-4);
  border-bottom: 1px solid var(--color-border-subtle);
  display: flex;
  align-items: center;
  justify-content: space-between;
}

@media (min-width: 769px) {
  .modal-header {
    padding: var(--space-6);
  }
}

.modal-title {
  font-size: var(--text-xl);
  font-weight: 600;
  margin: 0;
}

.modal-close {
  width: 32px;
  height: 32px;
  border-radius: var(--radius-md);
  border: none;
  background: transparent;
  color: var(--color-text-secondary);
  cursor: pointer;
  display: flex;
  align-items: center;
  justify-content: center;
  font-size: var(--text-xl);
  transition: all var(--duration-fast);
}

.modal-close:hover {
  background: var(--color-surface-sunken);
  color: var(--color-text-primary);
}

.modal-body {
  padding: var(--space-4);
}

@media (min-width: 769px) {
  .modal-body {
    padding: var(--space-6);
  }
}

.modal-footer {
  padding: var(--space-4);
  border-top: 1px solid var(--color-border-subtle);
  display: flex;
  gap: var(--space-3);
  justify-content: flex-end;
}

@media (min-width: 769px) {
  .modal-footer {
    padding: var(--space-6);
  }
}

/* =================================================================
   Loading Overlay
   ================================================================= */

.loading-overlay {
  position: fixed;
  inset: 0;
  background: rgba(26, 24, 22, 0.45);
  backdrop-filter: blur(4px);
  z-index: 200;
  display: flex;
  align-items: center;
  justify-content: center;
  opacity: 0;
  pointer-events: none;
  transition: opacity 0.2s ease;
}

.loading-overlay.active {
  opacity: 1;
  pointer-events: auto;
}

.loading-card {
  display: flex;
  flex-direction: column;
  align-items: center;
  gap: var(--space-4);
  padding: var(--space-6);
  background: var(--color-surface-elevated);
  border-radius: var(--radius-2xl);
  box-shadow: var(--shadow-xl);
}

@media (min-width: 769px) {
  .loading-card {
    padding: var(--space-8) var(--space-10);
  }
}

.loading-spinner {
  width: 36px;
  height: 36px;
  border: 3px solid var(--color-border-subtle);
  border-top-color: var(--color-brand-primary);
  border-radius: 50%;
  animation: spin 0.7s linear infinite;
}

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

.loading-text {
  font-size: var(--text-sm);
  font-weight: 500;
  color: var(--color-text-secondary);
  margin: 0;
}

/* =================================================================
   Quill Editor Customization
   ================================================================= */

#quillEditor {
  border-radius: var(--radius-lg);
  border: 1px solid var(--color-border-subtle);
  overflow: hidden;
}

#quillEditor .ql-toolbar {
  background: var(--color-surface-sunken);
  border: none;
  border-bottom: 1px solid var(--color-border-subtle);
  padding: var(--space-3);
}

#quillEditor .ql-container {
  border: none;
  font-family: inherit;
  font-size: var(--text-base);
}

#quillEditor .ql-editor {
  min-height: 200px;
  padding: var(--space-4);
}

@media (min-width: 769px) {
  #quillEditor .ql-editor {
    min-height: 300px;
  }
}

#quillEditor .ql-editor.ql-blank::before {
  color: #999;
  font-style: italic;
}

/* =================================================================
   Dark mode: override hardcoded inline colors in DB-sourced HTML
   content (lesson content_html, course descriptions, etc.)
   We need !important here because inline styles take precedence over
   class/selector rules, and the DB content may contain style="color:#000"
   ================================================================= */
[data-theme="dark"] .lesson-content-area *:not(a):not(button):not(.btn):not([class*="badge"]) {
  color: var(--color-text-primary) !important;
  background-color: transparent !important;
}

[data-theme="dark"] .lesson-content-area a {
  color: var(--color-brand-primary) !important;
}

[data-theme="dark"] .course-description-body *:not(a):not(button):not(.btn) {
  color: var(--color-text-primary) !important;
  background-color: transparent !important;
}

[data-theme="dark"] .course-description-body a {
  color: var(--color-brand-primary) !important;
}