:root {

  --primary-color: #3b82f6;
  --primary-dark: #1d4ed8;
  --primary-light: #60a5fa;

  --secondary-color: #8b5cf6;
  --accent-color: #06b6d4;
  --success-color: #10b981;
  --warning-color: #f59e0b;
  --error-color: #ef4444;

  --bg-primary: #ffffff;
  --bg-secondary: #f8fafc;
  --bg-tertiary: #f1f5f9;
  --card-bg: #ffffff;
  --hover-bg: #f1f5f9;
  --text-primary: #1e293b;
  --text-secondary: #64748b;
  --text-muted: #94a3b8;
  --border-color: #e2e8f0;
  --shadow-light: rgba(15, 23, 42, 0.08);
  --shadow-medium: rgba(15, 23, 42, 0.12);
  --shadow-heavy: rgba(15, 23, 42, 0.25);
  --shadow-lg: 0 10px 25px rgba(15, 23, 42, 0.15);

  --sidebar-width: 280px;
  --sidebar-collapsed-width: 80px;
  --header-height: 70px;
  --border-radius: 12px;
  --border-radius-lg: 16px;
  --border-radius-xl: 20px;
  --spacing-xs: 0.25rem;
  --spacing-sm: 0.5rem;
  --spacing-md: 1rem;
  --spacing-lg: 1.5rem;
  --spacing-xl: 2rem;
  --spacing-2xl: 3rem;

  --transition-fast: 0.15s ease;
  --transition-normal: 0.3s ease;
  --transition-slow: 0.5s ease;
  --transition-smooth: 0.3s cubic-bezier(0.4, 0, 0.2, 1);

  --text-xs: 0.75rem;
  --text-sm: 0.875rem;
  --text-base: 1rem;
  --text-lg: 1.125rem;
  --text-xl: 1.25rem;
  --text-2xl: 1.5rem;
  --text-3xl: 1.875rem;
}

[data-theme="dark"] {
  --bg-primary: #0f172a;
  --bg-secondary: #1e293b;
  --bg-tertiary: #334155;
  --text-primary: #f8fafc;
  --text-secondary: #cbd5e1;
  --text-muted: #94a3b8;
  --border-color: #334155;
  --shadow-light: rgba(0, 0, 0, 0.2);
  --shadow-medium: rgba(0, 0, 0, 0.3);
  --shadow-heavy: rgba(0, 0, 0, 0.5);
  --shadow-lg: rgba(0, 0, 0, 0.4);
  --card-bg: #1e293b;
  --hover-bg: #334155;
}

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

body {
  font-family: 'Outfit', -apple-system, BlinkMacSystemFont, 'Segoe UI', Roboto, sans-serif;
  background-color: var(--bg-secondary);
  color: var(--text-primary);
  line-height: 1.6;
  font-size: var(--text-base);
  overflow-x: hidden;
  transition: background-color var(--transition-normal), color var(--transition-normal);
}

.dashboard-container {
  display: flex;
  min-height: 100vh;
  background-color: var(--bg-secondary);
}

.sidebar {
  width: var(--sidebar-width);
  background-color: var(--bg-primary);
  border-right: 1px solid var(--border-color);
    display: flex;
    flex-direction: column;
  position: fixed;
  top: 0;
  left: 0;
  height: 100vh;
  z-index: 1000;
  transition: all var(--transition-normal);
  box-shadow: 0 0 20px var(--shadow-light);
}

.sidebar.collapsed {
  width: var(--sidebar-collapsed-width);
}

.sidebar.collapsed .sidebar-nav span,
.sidebar.collapsed .user-info,
.sidebar.collapsed .logo-text {
  opacity: 0;
  visibility: hidden;
}

.sidebar-header {
  padding: var(--spacing-lg);
  border-bottom: 1px solid var(--border-color);
  display: flex;
  align-items: center;
  justify-content: space-between;
  min-height: var(--header-height);
}

.logo {
  display: flex;
  align-items: center;
}

.logo-image {
  height: 35px;
  width: auto;
  margin-right: 10px;
  object-fit: contain;
  border-radius: 6px;
  transition: all 0.3s ease;
}

.logo-image:hover {
  transform: scale(1.05);
  filter: brightness(1.1);
}

.logo-text {
  font-size: var(--text-xl);
  font-weight: 800;
  color: var(--text-primary);
  transition: opacity var(--transition-normal);
}

.highlight {
  color: var(--primary-color);
}

.sidebar-toggle {
  background: none;
  border: none;
  color: var(--text-secondary);
  font-size: var(--text-lg);
  cursor: pointer;
  padding: var(--spacing-sm);
  border-radius: var(--border-radius);
  transition: all var(--transition-fast);
}

.sidebar-toggle:hover {
  background-color: var(--bg-tertiary);
  color: var(--text-primary);
}

.user-profile {
  padding: var(--spacing-lg);
  border-bottom: 1px solid var(--border-color);
  display: flex;
  align-items: center;
  gap: var(--spacing-md);
}

.user-avatar {
  width: 48px;
  height: 48px;
  border-radius: 50%;
  background: linear-gradient(135deg, var(--primary-color), var(--secondary-color));
  display: flex;
    align-items: center;
    justify-content: center;
  color: white;
  font-size: var(--text-xl);
  flex-shrink: 0;
}

.user-info {
  flex: 1;
  min-width: 0;
  transition: opacity var(--transition-normal);
}

.user-name {
  font-weight: 600;
  font-size: var(--text-base);
  color: var(--text-primary);
  white-space: nowrap;
  overflow: hidden;
  text-overflow: ellipsis;
}

.user-role {
  font-size: var(--text-sm);
  color: var(--text-secondary);
  white-space: nowrap;
  overflow: hidden;
  text-overflow: ellipsis;
}

.sidebar-nav {
  flex: 1;
  padding: var(--spacing-lg) 0;
}

.nav-menu {
  list-style: none;
}

.nav-item {
  margin-bottom: var(--spacing-xs);
}

.nav-link {
  display: flex;
  align-items: center;
  gap: var(--spacing-md);
  padding: var(--spacing-md) var(--spacing-lg);
  color: var(--text-secondary);
  text-decoration: none;
  transition: all var(--transition-fast);
  border-radius: 0;
}

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

.nav-link.active {
  background-color: var(--primary-color);
  color: white;
  font-weight: 500;
}

.nav-link i {
  font-size: var(--text-lg);
  width: 20px;
  text-align: center;
  flex-shrink: 0;
}

.nav-link span {
  transition: opacity var(--transition-normal);
  white-space: nowrap;
  overflow: hidden;
}

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

.logout-btn {
    display: flex;
  align-items: center;
  gap: var(--spacing-md);
  width: 100%;
  padding: var(--spacing-md);
  background: none;
  border: none;
  color: var(--text-secondary);
  cursor: pointer;
  border-radius: var(--border-radius);
  transition: all var(--transition-fast);
  font-size: var(--text-base);
}

.logout-btn:hover {
  background-color: var(--error-color);
  color: white;
}

.logout-btn i {
  font-size: var(--text-lg);
}

.main-content {
  flex: 1;
  margin-left: var(--sidebar-width);
  min-height: 100vh;
  display: flex;
  flex-direction: column;
  transition: margin-left var(--transition-normal);
}

.sidebar.collapsed + .main-content {
  margin-left: var(--sidebar-collapsed-width);
}

.top-header {
  height: var(--header-height);
  background-color: var(--bg-primary);
  border-bottom: 1px solid var(--border-color);
  display: flex;
  align-items: center;
    justify-content: space-between;
  padding: 0 var(--spacing-xl);
  position: sticky;
  top: 0;
  z-index: 100;
  box-shadow: 0 2px 4px var(--shadow-light);
}

.header-left {
  display: flex;
    align-items: center;
  gap: var(--spacing-lg);
}

.mobile-menu-toggle {
  display: none;
  background: none;
  border: none;
  color: var(--text-secondary);
  font-size: var(--text-lg);
  cursor: pointer;
  padding: var(--spacing-sm);
  border-radius: var(--border-radius);
}

.mobile-menu-toggle:hover {
  background-color: var(--bg-tertiary);
    color: var(--text-primary);
}

.breadcrumb {
  font-size: var(--text-lg);
    font-weight: 600;
  color: var(--text-primary);
}

.header-right {
    display: flex;
    align-items: center;
  gap: var(--spacing-lg);
}

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

.action-btn {
  position: relative;
  background: none;
  border: none;
  color: var(--text-secondary);
  font-size: var(--text-lg);
  cursor: pointer;
  padding: var(--spacing-sm);
  border-radius: var(--border-radius);
  transition: all var(--transition-fast);
}

.action-btn:hover {
  background-color: var(--bg-tertiary);
  color: var(--text-primary);
}

.notification-badge {
  position: absolute;
  top: -4px;
  right: -4px;
  background-color: var(--error-color);
    color: white;
  border-radius: 50%;
  width: 18px;
  height: 18px;
  font-size: 10px;
  display: flex;
  align-items: center;
  justify-content: center;
  font-weight: 600;
}

.user-dropdown {
  position: relative;
}

.user-dropdown-toggle {
  display: flex;
  align-items: center;
  gap: var(--spacing-sm);
  background: none;
  border: none;
  cursor: pointer;
  padding: var(--spacing-sm);
  border-radius: var(--border-radius);
  transition: all var(--transition-fast);
}

.user-dropdown-toggle:hover {
  background-color: var(--bg-tertiary);
}

.user-avatar-small {
  width: 32px;
  height: 32px;
  border-radius: 50%;
  background: linear-gradient(135deg, var(--primary-color), var(--secondary-color));
  display: flex;
  align-items: center;
  justify-content: center;
    color: white;
  font-size: var(--text-sm);
}

.user-dropdown-menu {
  position: absolute;
  top: 100%;
  right: 0;
  background-color: var(--bg-primary);
  border: 1px solid var(--border-color);
  border-radius: var(--border-radius);
  box-shadow: 0 4px 12px var(--shadow-medium);
  min-width: 200px;
  opacity: 0;
  visibility: hidden;
  transform: translateY(-10px);
  transition: all var(--transition-fast);
  z-index: 1000;
}

.user-dropdown:hover .user-dropdown-menu {
  opacity: 1;
  visibility: visible;
  transform: translateY(0);
}

.dropdown-item {
    display: flex;
    align-items: center;
  gap: var(--spacing-md);
  padding: var(--spacing-md) var(--spacing-lg);
  color: var(--text-secondary);
  text-decoration: none;
  transition: all var(--transition-fast);
}

.dropdown-item:hover {
  background-color: var(--bg-tertiary);
  color: var(--text-primary);
}

.dropdown-divider {
  height: 1px;
  background-color: var(--border-color);
  margin: var(--spacing-sm) 0;
}

.content-area {
  flex: 1;
  padding: var(--spacing-xl);
  overflow-y: auto;
}

.content-section {
  display: none;
}

.content-section.active {
  display: block;
  animation: fadeIn 0.3s ease;
}

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

.section-header {
  margin-bottom: var(--spacing-2xl);
}

.section-header h1 {
  font-size: var(--text-3xl);
  font-weight: 700;
  color: var(--text-primary);
  margin-bottom: var(--spacing-sm);
}

.section-header p {
  font-size: var(--text-lg);
  color: var(--text-secondary);
}

.stats-grid {
  display: grid;
  grid-template-columns: repeat(auto-fit, minmax(250px, 1fr));
  gap: var(--spacing-lg);
  margin-bottom: var(--spacing-2xl);
}

.stat-card {
  background-color: var(--bg-primary);
  border: 1px solid var(--border-color);
  border-radius: var(--border-radius-lg);
  padding: var(--spacing-xl);
    display: flex;
  align-items: center;
  gap: var(--spacing-lg);
  transition: all var(--transition-normal);
}

.stat-card:hover {
  transform: translateY(-2px);
  box-shadow: 0 8px 25px var(--shadow-medium);
}

.stat-icon {
  width: 60px;
  height: 60px;
  border-radius: var(--border-radius);
    display: flex;
    align-items: center;
  justify-content: center;
  font-size: var(--text-2xl);
  color: white;
  flex-shrink: 0;
}

.stat-card:nth-child(1) .stat-icon {
  background: linear-gradient(135deg, var(--primary-color), var(--primary-dark));
}

.stat-card:nth-child(2) .stat-icon {
  background: linear-gradient(135deg, var(--warning-color), #d97706);
}

.stat-card:nth-child(3) .stat-icon {
  background: linear-gradient(135deg, var(--success-color), #059669);
}

.stat-card:nth-child(4) .stat-icon {
  background: linear-gradient(135deg, var(--secondary-color), #7c3aed);
}

.stat-content {
  flex: 1;
}

.stat-number {
  font-size: var(--text-2xl);
  font-weight: 700;
  color: var(--text-primary);
  line-height: 1.2;
  margin-bottom: var(--spacing-xs);
}

.stat-label {
  font-size: var(--text-sm);
    color: var(--text-secondary);
  font-weight: 500;
}

.dashboard-widgets {
  display: grid;
  grid-template-columns: repeat(auto-fit, minmax(350px, 1fr));
  gap: var(--spacing-xl);
  margin-bottom: var(--spacing-2xl);
}

.widget {
  background-color: var(--bg-primary);
  border: 1px solid var(--border-color);
  border-radius: var(--border-radius-lg);
  overflow: hidden;
}

.widget-header {
  padding: var(--spacing-lg) var(--spacing-xl);
  border-bottom: 1px solid var(--border-color);
  display: flex;
  align-items: center;
  justify-content: space-between;
}

.widget-header h3 {
  font-size: var(--text-lg);
  font-weight: 600;
  color: var(--text-primary);
}

.widget-action {
  background: none;
  border: none;
    color: var(--primary-color);
  cursor: pointer;
  font-size: var(--text-sm);
    font-weight: 500;
    display: flex;
    align-items: center;
  gap: var(--spacing-xs);
  transition: all var(--transition-fast);
}

.widget-action:hover {
  color: var(--primary-dark);
}

.widget-content {
  padding: var(--spacing-xl);
}

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

.empty-state i {
  font-size: 3rem;
  margin-bottom: var(--spacing-lg);
  opacity: 0.5;
}

.empty-state h3 {
  font-size: var(--text-lg);
  font-weight: 600;
  margin-bottom: var(--spacing-sm);
}

.empty-state p {
  font-size: var(--text-base);
}

.lessons-container {
  display: grid;
  grid-template-columns: 300px 1fr;
  gap: var(--spacing-xl);
}

.lessons-filters {
  display: flex;
  gap: var(--spacing-lg);
  margin-bottom: var(--spacing-xl);
  padding: var(--spacing-lg);
  background-color: var(--bg-primary);
  border-radius: var(--border-radius);
  border: 1px solid var(--border-color);
}

.filter-group {
  display: flex;
  flex-direction: column;
  gap: var(--spacing-sm);
}

.filter-group label {
  font-size: var(--text-sm);
  font-weight: 500;
  color: var(--text-secondary);
}

.filter-select {
  padding: var(--spacing-sm) var(--spacing-md);
  border: 1px solid var(--border-color);
  border-radius: var(--border-radius);
  background-color: var(--bg-primary);
    color: var(--text-primary);
  font-size: var(--text-sm);
}

.lessons-grid {
  display: grid;
  grid-template-columns: repeat(auto-fill, minmax(300px, 1fr));
  gap: var(--spacing-lg);
}

.homework-container {
  max-width: 1200px;
}

.homework-stats {
  display: grid;
  grid-template-columns: repeat(auto-fit, minmax(200px, 1fr));
  gap: var(--spacing-lg);
  margin-bottom: var(--spacing-2xl);
}

.homework-list {
  display: flex;
  flex-direction: column;
  gap: var(--spacing-lg);
}

.grades-container {
  max-width: 1200px;
}

.grades-overview {
  background-color: var(--bg-primary);
  border: 1px solid var(--border-color);
  border-radius: var(--border-radius-lg);
  padding: var(--spacing-xl);
  margin-bottom: var(--spacing-2xl);
}

.grade-stats {
  display: grid;
  grid-template-columns: repeat(auto-fit, minmax(200px, 1fr));
  gap: var(--spacing-xl);
}

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

.stat-label {
  font-size: var(--text-sm);
  color: var(--text-secondary);
  margin-bottom: var(--spacing-sm);
}

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

.grades-chart-container {
  background-color: var(--bg-primary);
  border: 1px solid var(--border-color);
  border-radius: var(--border-radius-lg);
  padding: var(--spacing-xl);
  margin-bottom: var(--spacing-2xl);
}

.grades-chart-container h3 {
  font-size: var(--text-lg);
  font-weight: 600;
  color: var(--text-primary);
  margin-bottom: var(--spacing-lg);
  text-align: center;
}

.grades-table-container {
  background-color: var(--bg-primary);
  border: 1px solid var(--border-color);
  border-radius: var(--border-radius-lg);
  overflow: hidden;
}

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

.grades-table th,
.grades-table td {
  padding: var(--spacing-md) var(--spacing-lg);
  text-align: left;
  border-bottom: 1px solid var(--border-color);
}

.grades-table th {
  background-color: var(--bg-tertiary);
  font-weight: 600;
  color: var(--text-primary);
  font-size: var(--text-sm);
}

.grades-table tbody tr {
  transition: background-color var(--transition-fast);
}

.grades-table tbody tr:hover {
  background-color: var(--bg-secondary);
}

.attendance-container {
  max-width: 1200px;
}

.attendance-stats-grid {
  display: grid;
  grid-template-columns: repeat(auto-fit, minmax(250px, 1fr));
  gap: var(--spacing-lg);
  margin-bottom: var(--spacing-2xl);
}

.attendance-stat-card {
  background-color: var(--bg-primary);
  border: 1px solid var(--border-color);
  border-radius: var(--border-radius-lg);
  padding: var(--spacing-xl);
    display: flex;
    align-items: center;
  gap: var(--spacing-lg);
  transition: all var(--transition-normal);
}

.attendance-stat-card:hover {
  transform: translateY(-2px);
  box-shadow: 0 8px 25px var(--shadow-medium);
}

.attendance-stat-card .stat-icon {
  width: 50px;
  height: 50px;
  border-radius: var(--border-radius);
    display: flex;
  align-items: center;
  justify-content: center;
  font-size: var(--text-xl);
  color: white;
}

.attendance-stat-card .stat-icon.present {
  background: linear-gradient(135deg, var(--success-color), #059669);
}

.attendance-stat-card .stat-icon.absent {
  background: linear-gradient(135deg, var(--error-color), #dc2626);
}

.attendance-stat-card .stat-icon.late {
  background: linear-gradient(135deg, var(--warning-color), #d97706);
}

.attendance-stat-card .stat-icon.rate {
  background: linear-gradient(135deg, var(--primary-color), var(--primary-dark));
}

.attendance-stat-card .stat-content {
    flex: 1;
}

.attendance-stat-card .stat-number {
  font-size: var(--text-2xl);
  font-weight: 700;
  color: var(--text-primary);
  margin-bottom: var(--spacing-xs);
}

.attendance-stat-card .stat-label {
  font-size: var(--text-sm);
  color: var(--text-secondary);
  font-weight: 500;
}

.attendance-filters {
  display: flex;
  align-items: center;
  gap: var(--spacing-lg);
  margin-bottom: var(--spacing-2xl);
  padding: var(--spacing-lg);
  background-color: var(--bg-primary);
  border: 1px solid var(--border-color);
  border-radius: var(--border-radius-lg);
  flex-wrap: wrap;
}

.attendance-filters .filter-group {
    display: flex;
    align-items: center;
  gap: var(--spacing-sm);
}

.attendance-filters .filter-group label {
  font-size: var(--text-sm);
  font-weight: 500;
  color: var(--text-secondary);
  white-space: nowrap;
}

.attendance-filters .filter-select {
  padding: var(--spacing-sm) var(--spacing-md);
  border: 1px solid var(--border-color);
  border-radius: var(--border-radius);
  background-color: var(--bg-primary);
    color: var(--text-primary);
  font-size: var(--text-sm);
  min-width: 120px;
  transition: all var(--transition-fast);
}

.attendance-filters .filter-select:focus {
  outline: none;
  border-color: var(--primary-color);
  box-shadow: 0 0 0 2px rgba(59, 130, 246, 0.1);
}

.attendance-filters .filter-actions {
  margin-left: auto;
  display: flex;
  gap: var(--spacing-sm);
}

.attendance-calendar {
  background-color: var(--bg-primary);
  border: 1px solid var(--border-color);
  border-radius: var(--border-radius-lg);
  padding: var(--spacing-xl);
  margin-bottom: var(--spacing-2xl);
}

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

.calendar-header h3 {
  font-size: var(--text-lg);
  font-weight: 600;
  color: var(--text-primary);
  margin: 0;
}

.calendar-nav {
  background: none;
  border: none;
  color: var(--text-secondary);
  font-size: var(--text-lg);
  cursor: pointer;
  padding: var(--spacing-sm);
  border-radius: var(--border-radius);
  transition: all var(--transition-fast);
}

.calendar-nav:hover {
  background-color: var(--bg-tertiary);
  color: var(--text-primary);
}

.calendar-weekdays {
  display: grid;
  grid-template-columns: repeat(7, 1fr);
  gap: 1px;
  margin-bottom: var(--spacing-md);
}

.weekday {
  padding: var(--spacing-sm);
  text-align: center;
  font-size: var(--text-sm);
  font-weight: 600;
  color: var(--text-secondary);
  background-color: var(--bg-secondary);
  border-radius: var(--border-radius);
}

.calendar-grid {
  display: grid;
  grid-template-columns: repeat(7, 1fr);
  gap: 1px;
  background-color: var(--border-color);
  border-radius: var(--border-radius);
  overflow: hidden;
}

.calendar-day {
  background-color: var(--bg-primary);
  padding: var(--spacing-md);
  min-height: 60px;
  display: flex;
  flex-direction: column;
  align-items: center;
  justify-content: center;
  position: relative;
  cursor: pointer;
  transition: all var(--transition-fast);
}

.calendar-day:hover {
  background-color: var(--bg-secondary);
}

.calendar-day.other-month {
  opacity: 0.3;
}

.calendar-day.today {
  background-color: var(--primary-light);
    color: white;
}

.calendar-day.selected {
  background-color: var(--primary-color);
  color: white;
}

.calendar-day-number {
  font-weight: 600;
  font-size: var(--text-sm);
}

.calendar-day.selected .calendar-day-number {
  color: white;
}

.calendar-attendance-indicator {
  width: 8px;
  height: 8px;
  border-radius: 50%;
  margin-top: 2px;
}

.calendar-attendance-indicator.present {
  background-color: var(--success-color);
}

.calendar-attendance-indicator.absent {
  background-color: var(--error-color);
}

.calendar-attendance-indicator.late {
  background-color: var(--warning-color);
}

.calendar-attendance-indicator.excused {
  background-color: var(--info-color);
}

.attendance-records {
  background-color: var(--bg-primary);
  border: 1px solid var(--border-color);
  border-radius: var(--border-radius-lg);
  padding: var(--spacing-xl);
}

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

.records-header h3 {
  font-size: var(--text-lg);
  font-weight: 600;
  color: var(--text-primary);
  margin: 0;
}

.records-stats {
  display: flex;
  gap: var(--spacing-lg);
  align-items: center;
}

.records-stats .stat-item {
  font-size: var(--text-sm);
    color: var(--text-secondary);
}

.records-stats .stat-item strong {
    color: var(--text-primary);
}

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

.attendance-record {
  background-color: var(--bg-secondary);
    border: 1px solid var(--border-color);
  border-radius: var(--border-radius);
  padding: var(--spacing-lg);
  transition: all var(--transition-fast);
}

.attendance-record:hover {
  transform: translateY(-1px);
  box-shadow: 0 4px 12px var(--shadow-light);
}

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

.attendance-record-info {
  display: flex;
  flex-direction: column;
  gap: var(--spacing-xs);
}

.attendance-record-class {
  font-size: var(--text-base);
  font-weight: 600;
  color: var(--text-primary);
}

.attendance-record-date {
  font-size: var(--text-sm);
  color: var(--text-secondary);
}

.attendance-record-time {
  font-size: var(--text-xs);
  color: var(--text-secondary);
}

.attendance-status {
  padding: var(--spacing-xs) var(--spacing-sm);
  border-radius: var(--border-radius);
  font-size: var(--text-xs);
  font-weight: 600;
  text-transform: uppercase;
  letter-spacing: 0.5px;
}

.attendance-status.present {
  background-color: rgba(34, 197, 94, 0.1);
  color: var(--success-color);
}

.attendance-status.absent {
  background-color: rgba(239, 68, 68, 0.1);
  color: var(--error-color);
}

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

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

.attendance-record-notes {
  font-size: var(--text-sm);
  color: var(--text-secondary);
  font-style: italic;
  margin-top: var(--spacing-sm);
  padding-top: var(--spacing-sm);
  border-top: 1px solid var(--border-color);
}

.calendar-attendance-indicator.late {
  background-color: var(--warning-color);
}

.calendar-attendance-indicator.mixed {
  background: linear-gradient(90deg, var(--success-color) 50%, var(--error-color) 50%);
}

.calendar-legend {
  display: flex;
  justify-content: center;
  gap: var(--spacing-lg);
  margin-top: var(--spacing-lg);
  padding-top: var(--spacing-lg);
  border-top: 1px solid var(--border-color);
}

.legend-item {
  display: flex;
  align-items: center;
  gap: var(--spacing-sm);
  font-size: var(--text-sm);
  color: var(--text-secondary);
}

.legend-color {
  width: 12px;
  height: 12px;
  border-radius: 50%;
}

.legend-color.present {
  background-color: var(--success-color);
}

.legend-color.absent {
  background-color: var(--error-color);
}

.legend-color.late {
  background-color: var(--warning-color);
}

.legend-color.no-class {
  background-color: var(--text-muted);
}

.progress-container {
  max-width: 1200px;
}

.level-system {
  background: linear-gradient(135deg, #667eea 0%, #764ba2 100%);
  border-radius: var(--border-radius-xl);
  padding: var(--spacing-2xl);
  margin-bottom: var(--spacing-2xl);
  color: white;
  position: relative;
  overflow: hidden;
}

.level-system::before {
  content: '';
  position: absolute;
  top: 0;
  left: 0;
  right: 0;
  bottom: 0;
  background: url('data:image/svg+xml,<svg xmlns="http://www.w3.org/2000/svg" viewBox="0 0 100 100"><defs><pattern id="grain" width="100" height="100" patternUnits="userSpaceOnUse"><circle cx="25" cy="25" r="1" fill="rgba(255,255,255,0.1)"/><circle cx="75" cy="75" r="1" fill="rgba(255,255,255,0.1)"/><circle cx="50" cy="10" r="0.5" fill="rgba(255,255,255,0.05)"/></pattern></defs><rect width="100" height="100" fill="url(%23grain)"/></svg>');
  opacity: 0.3;
  pointer-events: none;
}

.level-header {
  text-align: center;
  margin-bottom: var(--spacing-xl);
  position: relative;
  z-index: 1;
}

.level-header h2 {
  font-size: var(--text-2xl);
  font-weight: 700;
  margin-bottom: var(--spacing-sm);
  text-shadow: 0 2px 4px rgba(0, 0, 0, 0.3);
}

.level-header p {
  font-size: var(--text-base);
  opacity: 0.9;
}

.level-display {
  display: flex;
  align-items: center;
  gap: var(--spacing-2xl);
  position: relative;
  z-index: 1;
}

.level-avatar {
  display: flex;
  align-items: center;
  gap: var(--spacing-lg);
  flex-shrink: 0;
}

.avatar-container {
  position: relative;
}

.avatar-image {
  width: 120px;
  height: 120px;
  border-radius: 50%;
  background: linear-gradient(135deg, #ffeaa7, #fdcb6e);
  display: flex;
  align-items: center;
  justify-content: center;
  font-size: 3rem;
  color: #2d3436;
  box-shadow: 0 10px 30px rgba(0, 0, 0, 0.3);
  border: 4px solid rgba(255, 255, 255, 0.2);
  transition: all var(--transition-normal);
}

.avatar-image:hover {
  transform: scale(1.05);
  box-shadow: 0 15px 40px rgba(0, 0, 0, 0.4);
}

.level-badge {
  position: absolute;
  bottom: -5px;
  right: -5px;
  width: 40px;
  height: 40px;
  border-radius: 50%;
  background: linear-gradient(135deg, #fd79a8, #e84393);
  display: flex;
  align-items: center;
  justify-content: center;
  font-size: var(--text-lg);
  font-weight: 700;
  color: white;
  box-shadow: 0 4px 15px rgba(232, 67, 147, 0.4);
  border: 3px solid white;
  animation: pulse 2s ease-in-out infinite;
}

@keyframes pulse {
  0%, 100% { transform: scale(1); }
  50% { transform: scale(1.1); }
}

.level-info h3 {
  font-size: var(--text-xl);
  font-weight: 600;
  margin-bottom: var(--spacing-xs);
  text-shadow: 0 1px 2px rgba(0, 0, 0, 0.2);
}

.level-info p {
  font-size: var(--text-base);
  opacity: 0.9;
}

.level-progress {
  flex: 1;
  display: flex;
  flex-direction: column;
  gap: var(--spacing-lg);
}

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

.progress-text {
  display: flex;
  justify-content: space-between;
  align-items: center;
  font-size: var(--text-sm);
  opacity: 0.9;
}

.progress-bar-container {
  position: relative;
}

.progress-bar-bg {
  height: 12px;
  background: rgba(255, 255, 255, 0.2);
  border-radius: 6px;
  overflow: hidden;
  position: relative;
}

.progress-bar-fill {
  height: 100%;
  background: linear-gradient(90deg, #00b894, #00cec9);
  border-radius: 6px;
  transition: width 1s ease-out;
  position: relative;
  overflow: hidden;
}

.progress-bar-fill::after {
  content: '';
  position: absolute;
  top: 0;
  left: -100%;
  width: 100%;
  height: 100%;
  background: linear-gradient(90deg, transparent, rgba(255, 255, 255, 0.4), transparent);
  animation: shimmer 2s infinite;
}

@keyframes shimmer {
  0% { left: -100%; }
  100% { left: 100%; }
}

.progress-bar-glow {
  position: absolute;
  top: -2px;
  left: -2px;
  right: -2px;
  bottom: -2px;
  background: linear-gradient(90deg, #00b894, #00cec9);
    border-radius: 8px;
  opacity: 0.3;
  filter: blur(4px);
  z-index: -1;
}

.next-level-info {
  display: flex;
  align-items: center;
  gap: var(--spacing-md);
  opacity: 0.8;
}

.next-level-badge {
  width: 30px;
  height: 30px;
  border-radius: 50%;
  background: rgba(255, 255, 255, 0.2);
  display: flex;
  align-items: center;
  justify-content: center;
  font-size: var(--text-sm);
  font-weight: 600;
  border: 2px solid rgba(255, 255, 255, 0.3);
}

.next-level-details h4 {
  font-size: var(--text-base);
  font-weight: 600;
  margin-bottom: var(--spacing-xs);
}

.next-level-details p {
  font-size: var(--text-sm);
  opacity: 0.8;
}

.xp-sources {
  background-color: var(--bg-primary);
  border: 1px solid var(--border-color);
  border-radius: var(--border-radius-lg);
  padding: var(--spacing-xl);
  margin-bottom: var(--spacing-2xl);
}

.xp-sources h3 {
  font-size: var(--text-lg);
  font-weight: 600;
    color: var(--text-primary);
  margin-bottom: var(--spacing-lg);
  text-align: center;
}

.xp-grid {
  display: grid;
  grid-template-columns: repeat(auto-fit, minmax(280px, 1fr));
  gap: var(--spacing-lg);
}

.xp-source {
  display: flex;
  align-items: center;
  gap: var(--spacing-md);
  padding: var(--spacing-lg);
  background: var(--bg-secondary);
  border-radius: var(--border-radius);
  border: 1px solid var(--border-color);
  transition: all var(--transition-normal);
  cursor: pointer;
}

.xp-source:hover {
  transform: translateY(-2px);
  box-shadow: 0 8px 25px var(--shadow-medium);
    border-color: var(--primary-color);
}

.xp-icon {
  width: 50px;
  height: 50px;
  border-radius: var(--border-radius);
  display: flex;
  align-items: center;
  justify-content: center;
  font-size: var(--text-xl);
  color: white;
  flex-shrink: 0;
}

.xp-icon.lessons {
  background: linear-gradient(135deg, #74b9ff, #0984e3);
}

.xp-icon.assignments {
  background: linear-gradient(135deg, #fd79a8, #e84393);
}

.xp-icon.exercises {
  background: linear-gradient(135deg, #fdcb6e, #e17055);
}

.xp-icon.projects {
  background: linear-gradient(135deg, #a29bfe, #6c5ce7);
}

.xp-icon.bonus {
  background: linear-gradient(135deg, #ffeaa7, #fdcb6e);
}

.xp-icon.streak {
  background: linear-gradient(135deg, #ff7675, #d63031);
}

.xp-details {
  flex: 1;
}

.xp-details h4 {
  font-size: var(--text-base);
  font-weight: 600;
  color: var(--text-primary);
  margin-bottom: var(--spacing-xs);
}

.xp-details p {
  font-size: var(--text-sm);
  color: var(--text-secondary);
  margin-bottom: var(--spacing-sm);
}

.xp-progress {
  font-size: var(--text-sm);
  color: var(--primary-color);
  font-weight: 500;
}

.badges-system {
  background-color: var(--bg-primary);
    border: 1px solid var(--border-color);
  border-radius: var(--border-radius-lg);
  padding: var(--spacing-xl);
  margin-bottom: var(--spacing-2xl);
}

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

.badges-header h3 {
  font-size: var(--text-lg);
  font-weight: 600;
  color: var(--text-primary);
}

.badges-stats {
  display: flex;
  gap: var(--spacing-lg);
}

.badge-stat {
  font-size: var(--text-sm);
  color: var(--text-secondary);
}

.badge-stat strong {
    color: var(--text-primary);
}

.badge-category {
  margin-bottom: var(--spacing-xl);
}

.badge-category:last-child {
  margin-bottom: 0;
}

.badge-category h4 {
  font-size: var(--text-base);
    font-weight: 600;
  color: var(--text-primary);
  margin-bottom: var(--spacing-md);
  padding-bottom: var(--spacing-sm);
  border-bottom: 2px solid var(--border-color);
}

.badges-grid {
  display: grid;
  grid-template-columns: repeat(auto-fill, minmax(120px, 1fr));
  gap: var(--spacing-lg);
}

.badge-item {
    display: flex;
  flex-direction: column;
    align-items: center;
  padding: var(--spacing-md);
  background: var(--bg-secondary);
  border-radius: var(--border-radius);
  border: 2px solid var(--border-color);
  transition: all var(--transition-normal);
  cursor: pointer;
  position: relative;
  overflow: hidden;
}

.badge-item:hover {
  transform: translateY(-4px);
  box-shadow: 0 10px 25px var(--shadow-medium);
}

.badge-item.earned {
  border-color: var(--success-color);
  background: linear-gradient(135deg, rgba(34, 197, 94, 0.1), rgba(34, 197, 94, 0.05));
}

.badge-item.earned::before {
  content: '';
  position: absolute;
  top: 0;
  left: 0;
  right: 0;
  bottom: 0;
  background: linear-gradient(45deg, transparent 30%, rgba(255, 255, 255, 0.1) 50%, transparent 70%);
  animation: badgeShine 3s infinite;
}

@keyframes badgeShine {
  0% { transform: translateX(-100%); }
  100% { transform: translateX(100%); }
}

.badge-item.locked {
  opacity: 0.5;
  filter: grayscale(100%);
}

.badge-icon {
  width: 60px;
  height: 60px;
  border-radius: 50%;
    display: flex;
  align-items: center;
  justify-content: center;
  font-size: var(--text-xl);
  color: white;
  margin-bottom: var(--spacing-sm);
  position: relative;
  z-index: 1;
}

.badge-icon.bronze {
  background: linear-gradient(135deg, #cd7f32, #b8860b);
}

.badge-icon.silver {
  background: linear-gradient(135deg, #c0c0c0, #a8a8a8);
}

.badge-icon.gold {
  background: linear-gradient(135deg, #ffd700, #ffb347);
}

.badge-icon.platinum {
  background: linear-gradient(135deg, #e5e4e2, #d3d3d3);
}

.badge-icon.diamond {
  background: linear-gradient(135deg, #b9f2ff, #00d4ff);
}

.badge-title {
  font-size: var(--text-xs);
  font-weight: 600;
  color: var(--text-primary);
  text-align: center;
  margin-bottom: var(--spacing-xs);
}

.badge-description {
  font-size: var(--text-xs);
    color: var(--text-secondary);
  text-align: center;
  line-height: 1.3;
}

.badge-earned-date {
  font-size: var(--text-xs);
  color: var(--success-color);
  text-align: center;
  margin-top: var(--spacing-xs);
  font-weight: 500;
}

.progress-statistics {
  background-color: var(--bg-primary);
  border: 1px solid var(--border-color);
  border-radius: var(--border-radius-lg);
  padding: var(--spacing-xl);
  margin-bottom: var(--spacing-2xl);
}

.progress-statistics h3 {
  font-size: var(--text-lg);
  font-weight: 600;
  color: var(--text-primary);
  margin-bottom: var(--spacing-lg);
  text-align: center;
}

.progress-statistics .stats-grid {
  display: grid;
  grid-template-columns: repeat(auto-fit, minmax(250px, 1fr));
  gap: var(--spacing-lg);
}

.progress-statistics .stat-card {
  background: var(--bg-secondary);
  border: 1px solid var(--border-color);
  border-radius: var(--border-radius);
  padding: var(--spacing-lg);
    display: flex;
    align-items: center;
  gap: var(--spacing-md);
  transition: all var(--transition-normal);
}

.progress-statistics .stat-card:hover {
  transform: translateY(-2px);
  box-shadow: 0 8px 25px var(--shadow-medium);
}

.progress-statistics .stat-icon {
  width: 50px;
  height: 50px;
  border-radius: var(--border-radius);
  background: linear-gradient(135deg, var(--primary-color), var(--primary-dark));
  display: flex;
  align-items: center;
  justify-content: center;
  font-size: var(--text-xl);
  color: white;
  flex-shrink: 0;
}

.activity-timeline {
  background-color: var(--bg-primary);
  border: 1px solid var(--border-color);
  border-radius: var(--border-radius-lg);
  padding: var(--spacing-xl);
}

.activity-timeline h3 {
  font-size: var(--text-lg);
  font-weight: 600;
    color: var(--text-primary);
  margin-bottom: var(--spacing-lg);
  text-align: center;
}

.timeline-container {
  position: relative;
}

.timeline-item {
  display: flex;
  align-items: center;
  gap: var(--spacing-md);
  padding: var(--spacing-md);
  margin-bottom: var(--spacing-md);
  background: var(--bg-secondary);
  border-radius: var(--border-radius);
  border-left: 4px solid var(--primary-color);
  transition: all var(--transition-normal);
}

.timeline-item:hover {
  transform: translateX(4px);
  box-shadow: 0 4px 12px var(--shadow-light);
}

.timeline-icon {
  width: 40px;
  height: 40px;
  border-radius: 50%;
  background: linear-gradient(135deg, var(--primary-color), var(--primary-dark));
  display: flex;
  align-items: center;
  justify-content: center;
  font-size: var(--text-sm);
    color: white;
  flex-shrink: 0;
}

.timeline-content {
  flex: 1;
}

.timeline-title {
  font-size: var(--text-base);
  font-weight: 600;
  color: var(--text-primary);
  margin-bottom: var(--spacing-xs);
}

.timeline-description {
  font-size: var(--text-sm);
  color: var(--text-secondary);
  margin-bottom: var(--spacing-xs);
}

.timeline-xp {
  font-size: var(--text-sm);
  color: var(--success-color);
  font-weight: 600;
}

.timeline-date {
  font-size: var(--text-xs);
  color: var(--text-secondary);
  text-align: right;
}

.level-up-animation {
  position: fixed;
  top: 0;
  left: 0;
  right: 0;
  bottom: 0;
  background: rgba(0, 0, 0, 0.8);
  display: flex;
  align-items: center;
  justify-content: center;
  z-index: 9999;
  animation: fadeIn 0.5s ease-out;
}

.level-up-content {
  background: linear-gradient(135deg, #667eea 0%, #764ba2 100%);
  color: white;
  padding: var(--spacing-2xl);
  border-radius: var(--border-radius-xl);
  text-align: center;
  animation: levelUpBounce 0.8s ease-out;
  position: relative;
  overflow: hidden;
}

.level-up-content::before {
  content: '';
  position: absolute;
  top: -50%;
  left: -50%;
  width: 200%;
  height: 200%;
  background: radial-gradient(circle, rgba(255, 255, 255, 0.1) 0%, transparent 70%);
  animation: levelUpGlow 2s ease-out infinite;
}

@keyframes fadeIn {
  from { opacity: 0; }
  to { opacity: 1; }
}

@keyframes levelUpBounce {
  0% { transform: scale(0.3) rotate(-180deg); opacity: 0; }
  50% { transform: scale(1.1) rotate(0deg); opacity: 1; }
  100% { transform: scale(1) rotate(0deg); opacity: 1; }
}

@keyframes levelUpGlow {
  0%, 100% { transform: rotate(0deg); opacity: 0.1; }
  50% { transform: rotate(180deg); opacity: 0.3; }
}

.level-up-title {
  font-size: var(--text-3xl);
  font-weight: 700;
  margin-bottom: var(--spacing-lg);
  text-shadow: 0 2px 4px rgba(0, 0, 0, 0.3);
}

.level-up-new-level {
  font-size: var(--text-2xl);
  font-weight: 600;
  margin-bottom: var(--spacing-md);
}

.level-up-description {
  font-size: var(--text-base);
  opacity: 0.9;
  margin-bottom: var(--spacing-lg);
}

.level-up-close {
  background: rgba(255, 255, 255, 0.2);
  border: none;
  color: white;
  padding: var(--spacing-md) var(--spacing-lg);
  border-radius: var(--border-radius);
  font-size: var(--text-base);
  cursor: pointer;
  transition: all var(--transition-fast);
}

.level-up-close:hover {
  background: rgba(255, 255, 255, 0.3);
  transform: scale(1.05);
}

@media (max-width: 768px) {
  .level-display {
    flex-direction: column;
    gap: var(--spacing-lg);
    text-align: center;
  }

  .level-avatar {
    flex-direction: column;
    gap: var(--spacing-md);
  }

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

  .badges-grid {
    grid-template-columns: repeat(auto-fill, minmax(100px, 1fr));
  }

  .progress-statistics .stats-grid {
    grid-template-columns: 1fr;
  }
}

.profile-avatar {
  position: relative;
}

.avatar-edit-btn {
  position: absolute;
  bottom: 0;
  right: 0;
  width: 24px;
  height: 24px;
  border-radius: 50%;
  background-color: var(--primary-color);
  color: white;
  border: none;
  cursor: pointer;
  display: flex;
  align-items: center;
  justify-content: center;
  font-size: 0.75rem;
  transition: all 0.2s ease;
}

.avatar-edit-btn:hover {
  background-color: var(--secondary-color);
  transform: scale(1.1);
}

.profile-join-date {
  margin-top: var(--spacing-md);
  font-size: var(--text-sm);
  color: var(--text-secondary);
  display: flex;
  align-items: center;
  gap: var(--spacing-sm);
  justify-content: center;
}

.profile-join-date i {
  color: var(--primary-color);
}

.edit-form {
  margin-top: var(--spacing-lg);
  padding: var(--spacing-lg);
  background-color: var(--bg-secondary);
  border-radius: var(--border-radius);
  border: 1px solid var(--border-color);
}

.form-grid {
  display: grid;
  grid-template-columns: repeat(auto-fit, minmax(250px, 1fr));
  gap: var(--spacing-lg);
  margin-bottom: var(--spacing-lg);
}

.form-group {
  display: flex;
  flex-direction: column;
  gap: var(--spacing-sm);
}

.form-group label {
  font-size: var(--text-sm);
  font-weight: 500;
  color: var(--text-secondary);
}

.form-input,
.form-select {
  padding: var(--spacing-md);
  border: 1px solid var(--border-color);
  border-radius: var(--border-radius);
  background-color: var(--bg-primary);
  color: var(--text-primary);
  font-size: var(--text-base);
  transition: all 0.2s ease;
}

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

.form-actions {
  display: flex;
  gap: var(--spacing-md);
  justify-content: flex-end;
}

.toggle-switch {
  position: relative;
  display: inline-block;
  width: 50px;
  height: 24px;
}

.toggle-switch input {
  opacity: 0;
  width: 0;
  height: 0;
}

.toggle-slider {
  position: absolute;
  cursor: pointer;
  top: 0;
  left: 0;
  right: 0;
  bottom: 0;
  background-color: var(--text-muted);
  transition: 0.3s;
  border-radius: 24px;
}

.toggle-slider:before {
  position: absolute;
  content: "";
  height: 18px;
  width: 18px;
  left: 3px;
  bottom: 3px;
  background-color: white;
  transition: 0.3s;
  border-radius: 50%;
}

input:checked + .toggle-slider {
  background-color: var(--primary-color);
}

input:checked + .toggle-slider:before {
  transform: translateX(26px);
}

.btn-text {
  background: none;
  border: none;
  color: var(--primary-color);
  cursor: pointer;
  font-size: var(--text-sm);
    font-weight: 500;
    display: flex;
    align-items: center;
  gap: var(--spacing-sm);
  padding: var(--spacing-sm);
  border-radius: var(--border-radius);
  transition: all 0.2s ease;
}

.btn-text:hover {
  background-color: rgba(59, 130, 246, 0.1);
}

.btn-text.text-warning {
  color: var(--warning-color);
}

.btn-text.text-warning:hover {
  background-color: rgba(245, 158, 11, 0.1);
}

.btn-text.text-danger {
  color: var(--error-color);
}

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

.btn-primary {
  background-color: var(--primary-color);
  color: white;
  border: none;
  padding: var(--spacing-md) var(--spacing-lg);
  border-radius: var(--border-radius);
  font-size: var(--text-sm);
  font-weight: 500;
  cursor: pointer;
  display: flex;
  align-items: center;
  gap: var(--spacing-sm);
  transition: all 0.2s ease;
}

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

.btn-secondary {
  background-color: transparent;
  color: var(--text-secondary);
  border: 1px solid var(--border-color);
  padding: var(--spacing-md) var(--spacing-lg);
  border-radius: var(--border-radius);
  font-size: var(--text-sm);
  font-weight: 500;
  cursor: pointer;
  display: flex;
  align-items: center;
  gap: var(--spacing-sm);
  transition: all 0.2s ease;
}

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

.modal {
  display: none;
    position: fixed;
  z-index: 1000;
  left: 0;
  top: 0;
  width: 100%;
  height: 100%;
  background-color: rgba(0, 0, 0, 0.5);
  backdrop-filter: blur(4px);
}

.modal.active {
    display: flex;
    align-items: center;
  justify-content: center;
}

.modal-content {
  background-color: var(--bg-primary);
  border-radius: var(--border-radius-lg);
  width: 90%;
  max-width: 500px;
  max-height: 90vh;
  overflow-y: auto;
  box-shadow: 0 20px 25px -5px rgba(0, 0, 0, 0.1);
}

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

.modal-header h3 {
  font-size: var(--text-lg);
  font-weight: 600;
  color: var(--text-primary);
  margin: 0;
}

.modal-close {
  background: none;
  border: none;
  color: var(--text-secondary);
  cursor: pointer;
  font-size: var(--text-lg);
  padding: var(--spacing-sm);
  border-radius: var(--border-radius);
  transition: all 0.2s ease;
}

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

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

.modal-footer {
  padding: var(--spacing-xl);
  border-top: 1px solid var(--border-color);
  display: flex;
  gap: var(--spacing-md);
  justify-content: flex-end;
}

.password-strength {
  margin-top: var(--spacing-sm);
  font-size: var(--text-sm);
}

.password-strength.weak {
  color: var(--error-color);
}

.password-strength.medium {
    color: var(--warning-color);
}

.password-strength.strong {
  color: var(--success-color);
}

.password-requirements {
  margin-top: var(--spacing-lg);
  padding: var(--spacing-md);
  background-color: var(--bg-secondary);
  border-radius: var(--border-radius);
}

.password-requirements h4 {
  font-size: var(--text-sm);
  font-weight: 600;
  color: var(--text-primary);
  margin-bottom: var(--spacing-sm);
}

.password-requirements ul {
  list-style: none;
  padding: 0;
  margin: 0;
}

.password-requirements li {
  font-size: var(--text-sm);
  color: var(--text-secondary);
  margin-bottom: var(--spacing-xs);
  display: flex;
  align-items: center;
  gap: var(--spacing-sm);
}

.password-requirements li:before {
  content: "✗";
    color: var(--error-color);
  font-weight: bold;
}

.password-requirements li.valid:before {
  content: "✓";
  color: var(--success-color);
}

@media (max-width: 768px) {
  .profile-container {
    grid-template-columns: 1fr;
    gap: var(--spacing-lg);
  }

  .profile-overview {
    order: 1;
  }

  .profile-settings {
    order: 2;
  }

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

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

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

  .form-actions {
    flex-direction: column;
  }

  .modal-content {
    width: 95%;
    margin: var(--spacing-md);
  }
}

.profile-container {
  display: grid;
  grid-template-columns: 400px 1fr;
  gap: var(--spacing-xl);
  max-width: 1200px;
}

.profile-overview {
  height: fit-content;
}

.profile-card {
  background-color: var(--bg-primary);
  border: 1px solid var(--border-color);
  border-radius: var(--border-radius-lg);
  overflow: hidden;
}

.profile-header {
  padding: var(--spacing-xl);
  text-align: center;
  border-bottom: 1px solid var(--border-color);
}

.profile-avatar {
  width: 80px;
  height: 80px;
  border-radius: 50%;
  background: linear-gradient(135deg, var(--primary-color), var(--secondary-color));
  display: flex;
  align-items: center;
  justify-content: center;
  color: white;
  font-size: 2rem;
  margin: 0 auto var(--spacing-lg);
}

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

.profile-info h2 {
  font-size: var(--text-xl);
  font-weight: 700;
  color: var(--text-primary);
  margin-bottom: var(--spacing-sm);
}

.profile-info p {
  font-size: var(--text-base);
  color: var(--text-secondary);
  margin-bottom: var(--spacing-md);
}

.profile-role {
  margin-top: var(--spacing-md);
}

.role-badge {
  display: inline-block;
  padding: var(--spacing-xs) var(--spacing-md);
  border-radius: 20px;
  font-size: var(--text-sm);
  font-weight: 500;
  text-transform: uppercase;
  letter-spacing: 0.5px;
}

.role-badge.student {
  background-color: var(--primary-color);
  color: white;
}

.profile-stats {
  display: flex;
  padding: var(--spacing-lg) var(--spacing-xl);
}

.profile-stats .stat-item {
  flex: 1;
  text-align: center;
}

.profile-stats .stat-item:not(:last-child) {
  border-right: 1px solid var(--border-color);
}

.profile-stats .stat-value {
  display: block;
  font-size: var(--text-xl);
  font-weight: 700;
  color: var(--primary-color);
  margin-bottom: var(--spacing-xs);
}

.profile-stats .stat-label {
  font-size: var(--text-sm);
  color: var(--text-secondary);
}

.profile-settings {
  display: flex;
  flex-direction: column;
  gap: var(--spacing-xl);
}

.settings-section {
  background-color: var(--bg-primary);
  border: 1px solid var(--border-color);
  border-radius: var(--border-radius-lg);
  padding: var(--spacing-xl);
}

.section-title {
  margin-bottom: var(--spacing-lg);
  padding-bottom: var(--spacing-lg);
  border-bottom: 1px solid var(--border-color);
}

.section-title h3 {
  font-size: var(--text-lg);
  font-weight: 600;
  color: var(--text-primary);
  display: flex;
  align-items: center;
  gap: var(--spacing-sm);
}

.info-grid {
  display: grid;
  grid-template-columns: repeat(auto-fit, minmax(250px, 1fr));
  gap: var(--spacing-lg);
}

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

.info-item label {
  font-size: var(--text-sm);
  font-weight: 500;
  color: var(--text-secondary);
}

.info-item span {
  font-size: var(--text-base);
  color: var(--text-primary);
}

.preferences-grid {
  display: flex;
  flex-direction: column;
  gap: var(--spacing-lg);
}

.preference-item {
  display: flex;
  align-items: center;
  justify-content: space-between;
  padding: var(--spacing-lg);
  border: 1px solid var(--border-color);
  border-radius: var(--border-radius);
}

.preference-info {
  flex: 1;
}

.preference-info h4 {
  font-size: var(--text-base);
  font-weight: 600;
  color: var(--text-primary);
  margin-bottom: var(--spacing-xs);
}

.preference-info p {
  font-size: var(--text-sm);
  color: var(--text-secondary);
}

.preference-control {
  margin-left: var(--spacing-lg);
}

.toggle-switch {
  position: relative;
  display: inline-block;
  width: 50px;
  height: 24px;
  cursor: pointer;
}

.toggle-switch input {
  opacity: 0;
  width: 0;
  height: 0;
}

.toggle-slider {
  position: absolute;
  cursor: pointer;
  top: 0;
  left: 0;
  right: 0;
  bottom: 0;
  background-color: #ccc;
  transition: 0.4s;
  border-radius: 24px;
}

.toggle-slider:before {
  position: absolute;
  content: "";
  height: 18px;
  width: 18px;
  left: 3px;
  bottom: 3px;
  background-color: white;
  transition: 0.4s;
  border-radius: 50%;
}

input:checked + .toggle-slider {
  background-color: var(--primary-color);
}

input:checked + .toggle-slider:before {
  transform: translateX(26px);
}

.modal {
  display: none;
  position: fixed;
  z-index: 2000;
  left: 0;
  top: 0;
  width: 100%;
  height: 100%;
  background-color: rgba(0, 0, 0, 0.5);
  backdrop-filter: blur(4px);
}

.modal.show {
  display: flex;
  align-items: center;
  justify-content: center;
  animation: fadeIn 0.3s ease;
}

.modal-content {
  background-color: var(--bg-primary);
  border-radius: var(--border-radius-lg);
  box-shadow: 0 20px 40px var(--shadow-heavy);
  max-width: 500px;
  width: 90%;
  max-height: 80vh;
  overflow-y: auto;
  animation: slideIn 0.3s ease;
}

@keyframes slideIn {
    from {
        opacity: 0;
    transform: translateY(-50px) scale(0.9);
    }
    to {
        opacity: 1;
    transform: translateY(0) scale(1);
  }
}

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

.modal-header h3 {
  font-size: var(--text-lg);
  font-weight: 600;
  color: var(--text-primary);
    display: flex;
    align-items: center;
  gap: var(--spacing-sm);
}

.modal-close {
  background: none;
  border: none;
  color: var(--text-secondary);
  font-size: var(--text-lg);
  cursor: pointer;
  padding: var(--spacing-sm);
  border-radius: var(--border-radius);
  transition: all var(--transition-fast);
}

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

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

.mobile-overlay {
  display: none;
  position: fixed;
  top: 0;
  left: 0;
  width: 100%;
  height: 100%;
  background-color: rgba(0, 0, 0, 0.5);
  z-index: 999;
  opacity: 0;
  transition: opacity var(--transition-normal);
}

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

@media (max-width: 1024px) {
  .sidebar {
    transform: translateX(-100%);
  }

  .sidebar.mobile-open {
    transform: translateX(0);
  }

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

  .mobile-menu-toggle {
    display: block;
  }

  .profile-container {
    grid-template-columns: 1fr;
  }

  .lessons-container {
    grid-template-columns: 1fr;
  }
}

@media (max-width: 768px) {
  .top-header {
    padding: 0 var(--spacing-lg);
  }

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

  .header-actions {
    gap: var(--spacing-sm);
  }

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

  .stats-grid {
    grid-template-columns: repeat(auto-fit, minmax(200px, 1fr));
    gap: var(--spacing-md);
  }

  .dashboard-widgets {
    grid-template-columns: 1fr;
    gap: var(--spacing-lg);
  }

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

  .progress-content {
    flex-direction: column;
    text-align: center;
  }
}

@media (max-width: 480px) {
  .content-area {
    padding: var(--spacing-md);
  }

  .section-header h1 {
    font-size: var(--text-2xl);
  }

  .user-dropdown-menu {
    min-width: 150px;
  }

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

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

  .preference-item {
    flex-direction: column;
    align-items: stretch;
    gap: var(--spacing-md);
  }

  .preference-control {
    margin-left: 0;
    align-self: flex-start;
  }
}

.notification {
  position: fixed;
  top: 20px;
  right: 20px;
  padding: var(--spacing-md) var(--spacing-lg);
  border-radius: var(--border-radius);
  color: white;
  font-size: var(--text-sm);
  font-weight: 500;
  z-index: 10001;
        opacity: 0;
  transform: translateX(100%);
  transition: all var(--transition-normal);
}

.notification.show {
  opacity: 1;
  transform: translateX(0);
}

.notification.info {
  background-color: var(--primary-color);
}

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

.notification.warning {
  background-color: var(--warning-color);
}

.notification.error {
  background-color: var(--error-color);
}

.message-badge {
  position: absolute;
  top: -5px;
  right: -5px;
  width: 18px;
  height: 18px;
  background: var(--error-color);
  color: white;
  border-radius: 50%;
  font-size: 0.7rem;
  display: flex;
  align-items: center;
  justify-content: center;
    font-weight: 600;
  animation: pulse 2s infinite;
}

.messages-container {
  display: grid;
  grid-template-columns: 350px 1fr;
  gap: var(--spacing-lg);
  height: calc(100vh - 200px);
  background: var(--bg-primary);
  border-radius: var(--border-radius);
  overflow: hidden;
  box-shadow: var(--shadow-light);
}

.messages-sidebar {
  background: var(--bg-secondary);
  border-right: 1px solid var(--border-color);
  display: flex;
  flex-direction: column;
}

.messages-header {
  padding: var(--spacing-lg);
  border-bottom: 1px solid var(--border-color);
}

.messages-filters {
  padding: var(--spacing-md);
  border-bottom: 1px solid var(--border-color);
}

.filter-tabs {
  display: flex;
  gap: var(--spacing-xs);
}

.filter-tab {
  padding: var(--spacing-sm) var(--spacing-md);
  border: none;
  background: transparent;
  color: var(--text-secondary);
  border-radius: var(--border-radius);
  cursor: pointer;
  transition: all var(--transition-normal);
  font-size: var(--text-sm);
}

.filter-tab:hover {
  background: var(--bg-tertiary);
}

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

.messages-list {
  flex: 1;
  overflow-y: auto;
  padding: var(--spacing-sm);
}

.message-item {
  padding: var(--spacing-md);
  border-radius: var(--border-radius);
  cursor: pointer;
  transition: all var(--transition-normal);
  margin-bottom: var(--spacing-xs);
  border-left: 3px solid transparent;
}

.message-item:hover {
  background: var(--bg-tertiary);
}

.message-item.unread {
  background: var(--primary-light);
  border-left-color: var(--primary-color);
}

.message-sender {
  display: flex;
  align-items: center;
  gap: var(--spacing-sm);
  margin-bottom: var(--spacing-xs);
}

.message-sender i {
  color: var(--text-secondary);
}

.message-sender span {
  font-weight: 500;
  color: var(--text-primary);
}

.message-preview {
  margin-bottom: var(--spacing-sm);
}

.message-subject {
  font-weight: 500;
  color: var(--text-primary);
  margin-bottom: var(--spacing-xs);
  font-size: var(--text-sm);
}

.message-snippet {
  color: var(--text-secondary);
  font-size: var(--text-xs);
  line-height: 1.4;
}

.message-meta {
  display: flex;
  align-items: center;
  justify-content: space-between;
}

.message-date {
  color: var(--text-secondary);
  font-size: var(--text-xs);
}

.unread-indicator {
  width: 8px;
  height: 8px;
  background: var(--primary-color);
  border-radius: 50%;
}

.messages-content {
  background: var(--bg-primary);
  display: flex;
  flex-direction: column;
}

.messages-empty {
  display: flex;
  flex-direction: column;
  align-items: center;
  justify-content: center;
  height: 100%;
  color: var(--text-secondary);
}

.messages-empty i {
  font-size: 3rem;
  margin-bottom: var(--spacing-md);
  color: var(--text-secondary);
}

.messages-empty h3 {
  margin-bottom: var(--spacing-sm);
  color: var(--text-primary);
}

.message-thread {
  display: flex;
  flex-direction: column;
  height: 100%;
}

.message-header {
  padding: var(--spacing-lg);
  border-bottom: 1px solid var(--border-color);
  display: flex;
  justify-content: space-between;
  align-items: flex-start;
}

.message-subject h3 {
  margin: 0 0 var(--spacing-xs) 0;
  color: var(--text-primary);
}

.message-participants {
  color: var(--text-secondary);
  font-size: var(--text-sm);
}

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

.message-content-area {
  flex: 1;
  padding: var(--spacing-lg);
  overflow-y: auto;
}

.message-bubble {
  background: var(--bg-secondary);
    border: 1px solid var(--border-color);
  border-radius: var(--border-radius);
  padding: var(--spacing-lg);
  margin-bottom: var(--spacing-md);
}

.message-bubble.sent {
  background: var(--primary-light);
  border-color: var(--primary-color);
  margin-left: auto;
  margin-right: 0;
  max-width: 80%;
}

.message-bubble.received {
  background: var(--bg-secondary);
  border-color: var(--border-color);
  margin-left: 0;
  margin-right: auto;
  max-width: 80%;
}

.message-bubble .message-header {
    display: flex;
    justify-content: space-between;
    align-items: center;
  margin-bottom: var(--spacing-md);
  padding: 0;
  border: none;
}

.message-author {
  font-weight: 600;
  color: var(--text-primary);
}

.message-timestamp {
  color: var(--text-secondary);
  font-size: var(--text-xs);
}

.message-body {
  color: var(--text-primary);
  line-height: 1.6;
}

@media (max-width: 768px) {
  .messages-container {
    grid-template-columns: 1fr;
    height: auto;
  }

  .messages-sidebar {
    display: none;
  }

  .messages-sidebar.active {
    display: flex;
    position: fixed;
    top: 0;
    left: 0;
    width: 100%;
    height: 100%;
    z-index: 1000;
    background: var(--bg-secondary);
  }

  .message-bubble {
    max-width: 100%;
  }
}

.notifications-popup,
.messages-popup {
  position: fixed;
  top: 70px;
  right: 20px;
  width: 350px;
  max-height: 500px;
  background: var(--bg-primary);
  border-radius: var(--border-radius);
  box-shadow: 0 10px 30px rgba(0, 0, 0, 0.2);
  z-index: 1000;
  transform: translateY(-10px);
  opacity: 0;
  visibility: hidden;
  transition: all 0.3s ease;
}

.notifications-popup.show,
.messages-popup.show {
  transform: translateY(0);
  opacity: 1;
  visibility: visible;
}

.popup-header {
  padding: var(--spacing-md) var(--spacing-lg);
  border-bottom: 1px solid var(--border-color);
  display: flex;
  justify-content: space-between;
  align-items: center;
}

.popup-header h3 {
  margin: 0;
  color: var(--text-primary);
  font-size: var(--text-md);
}

.popup-close {
  background: none;
  border: none;
  color: var(--text-secondary);
  cursor: pointer;
  padding: var(--spacing-xs);
  border-radius: var(--border-radius);
  transition: all var(--transition-fast);
}

.popup-close:hover {
  background: var(--bg-tertiary);
  color: var(--text-primary);
}

.popup-content {
  max-height: 350px;
  overflow-y: auto;
  padding: var(--spacing-sm);
}

.popup-footer {
  padding: var(--spacing-md) var(--spacing-lg);
  border-top: 1px solid var(--border-color);
  text-align: center;
}

.notification-item {
  padding: var(--spacing-md);
  border-radius: var(--border-radius);
  margin-bottom: var(--spacing-xs);
  cursor: pointer;
  transition: all var(--transition-fast);
  border-left: 3px solid transparent;
}

.notification-item:hover {
  background: var(--bg-tertiary);
}

.notification-item.unread {
  background: var(--primary-light);
  border-left-color: var(--primary-color);
}

.notification-header {
  display: flex;
  justify-content: space-between;
  align-items: flex-start;
  margin-bottom: var(--spacing-xs);
}

.notification-title {
  font-weight: 500;
  color: var(--text-primary);
  font-size: var(--text-sm);
}

.notification-time {
  color: var(--text-secondary);
  font-size: var(--text-xs);
}

.notification-message {
  color: var(--text-secondary);
  font-size: var(--text-sm);
  line-height: 1.4;
}

.message-item-popup {
  padding: var(--spacing-md);
  border-radius: var(--border-radius);
  margin-bottom: var(--spacing-xs);
  cursor: pointer;
  transition: all var(--transition-fast);
  border-left: 3px solid transparent;
}

.message-item-popup:hover {
  background: var(--bg-tertiary);
}

.message-item-popup.unread {
  background: var(--primary-light);
  border-left-color: var(--primary-color);
}

.message-sender-popup {
  display: flex;
  align-items: center;
  gap: var(--spacing-sm);
  margin-bottom: var(--spacing-xs);
}

.message-sender-popup i {
  color: var(--text-secondary);
}

.message-sender-popup span {
  font-weight: 500;
  color: var(--text-primary);
  font-size: var(--text-sm);
}

.message-preview-popup {
  margin-bottom: var(--spacing-xs);
}

.message-subject-popup {
  font-weight: 500;
  color: var(--text-primary);
  font-size: var(--text-sm);
  margin-bottom: var(--spacing-xs);
}

.message-snippet-popup {
  color: var(--text-secondary);
  font-size: var(--text-xs);
  line-height: 1.4;
}

.message-meta-popup {
  display: flex;
  justify-content: space-between;
  align-items: center;
}

.message-date-popup {
  color: var(--text-secondary);
  font-size: var(--text-xs);
}

@media (max-width: 768px) {
  .notifications-popup,
  .messages-popup {
    width: calc(100vw - 40px);
    right: 20px;
    left: 20px;
    top: 60px;
  }
}

.class-access-check {
    display: flex;
    justify-content: center;
    align-items: center;
    min-height: 400px;
    padding: 2rem;
}

.no-class-message {
    text-align: center;
    max-width: 600px;
    background: var(--card-bg);
    border: 2px dashed var(--border-color);
    border-radius: 12px;
    padding: 3rem 2rem;
}

.no-class-icon {
    font-size: 4rem;
    color: var(--primary-color);
    margin-bottom: 1.5rem;
}

.no-class-message h3 {
    color: var(--text-primary);
    margin-bottom: 1rem;
    font-size: 1.5rem;
}

.no-class-message p {
    color: var(--text-secondary);
    margin-bottom: 2rem;
    line-height: 1.6;
}

.contact-info {
    background: var(--bg-secondary);
    border-radius: 8px;
    padding: 1.5rem;
    margin-top: 2rem;
}

.contact-info p {
    color: var(--text-primary);
    font-weight: 600;
    margin-bottom: 1rem;
}

.contact-info ul {
    list-style: none;
    padding: 0;
}

.contact-info li {
    color: var(--text-secondary);
    margin-bottom: 0.5rem;
    padding-left: 1.5rem;
    position: relative;
}

.contact-info li:before {
    content: "•";
    color: var(--primary-color);
    position: absolute;
    left: 0;
    font-weight: bold;
}

#studentEmail {
    color: var(--primary-color);
    font-weight: 600;
}

.class-content {
    animation: fadeIn 0.5s ease-in-out;
}

.class-info-header {
    margin-bottom: 2rem;
}

.class-info-card {
    background: var(--card-bg);
    border-radius: 12px;
    padding: 2rem;
    display: flex;
    align-items: center;
    gap: 1.5rem;
    box-shadow: var(--shadow-sm);
    border: 1px solid var(--border-color);
}

.class-icon {
    background: var(--primary-color);
    color: white;
    width: 80px;
    height: 80px;
    border-radius: 50%;
    display: flex;
    align-items: center;
    justify-content: center;
    font-size: 2rem;
    flex-shrink: 0;
}

.class-details h2 {
    color: var(--text-primary);
    margin-bottom: 0.5rem;
    font-size: 1.8rem;
}

.class-details p {
    color: var(--text-secondary);
    margin-bottom: 1rem;
    line-height: 1.6;
}

.class-meta {
    display: flex;
    gap: 2rem;
    flex-wrap: wrap;
}

.class-teacher,
.class-students {
    display: flex;
    align-items: center;
    gap: 0.5rem;
    color: var(--text-secondary);
    font-size: 0.9rem;
}

.class-teacher i,
.class-students i {
    color: var(--primary-color);
}

.class-nav-tabs {
    display: flex;
    background: var(--card-bg);
    border-radius: 12px;
    padding: 0.5rem;
    margin-bottom: 2rem;
    box-shadow: var(--shadow-sm);
    border: 1px solid var(--border-color);
}

.class-tab {
    flex: 1;
    background: none;
    border: none;
    padding: 1rem 1.5rem;
    border-radius: 8px;
    display: flex;
    align-items: center;
    justify-content: center;
    gap: 0.5rem;
    cursor: pointer;
    transition: all 0.3s ease;
    color: var(--text-secondary);
    font-weight: 500;
    position: relative;
}

.class-tab:hover {
    background: var(--bg-secondary);
    color: var(--text-primary);
}

.class-tab.active {
    background: var(--primary-color);
    color: white;
    box-shadow: var(--shadow-sm);
}

.class-tab i {
    font-size: 1.1rem;
}

.chat-badge,
.announcement-badge {
    background: var(--danger-color);
    color: white;
    font-size: 0.75rem;
    padding: 0.2rem 0.5rem;
    border-radius: 10px;
    min-width: 18px;
    text-align: center;
    margin-left: 0.5rem;
}

.class-tab.active .chat-badge,
.class-tab.active .announcement-badge {
    background: rgba(255, 255, 255, 0.3);
}

.class-tab-content {
    display: none;
    animation: fadeIn 0.3s ease-in-out;
}

.class-tab-content.active {
    display: block;
}

.lessons-header {
    display: flex;
    justify-content: space-between;
    align-items: center;
    margin-bottom: 2rem;
    flex-wrap: wrap;
    gap: 1rem;
}

.lessons-header h3 {
    color: var(--text-primary);
    font-size: 1.5rem;
    margin: 0;
}

.lessons-stats {
    display: flex;
    gap: 2rem;
    flex-wrap: wrap;
}

.lessons-stats .stat-item {
    color: var(--text-secondary);
    font-size: 0.9rem;
}

.lessons-stats .stat-item strong {
    color: var(--primary-color);
}

.lessons-list {
    display: grid;
    gap: 1rem;
}

.lesson-item {
    background: var(--card-bg);
    border: 1px solid var(--border-color);
    border-radius: 12px;
    padding: 1.5rem;
    transition: all 0.3s ease;
    cursor: pointer;
}

.lesson-item:hover {
    border-color: var(--primary-color);
    box-shadow: var(--shadow-md);
    transform: translateY(-2px);
}

.lesson-item.completed {
    background: var(--success-bg);
    border-color: var(--success-color);
}

.lesson-header {
    display: flex;
    justify-content: space-between;
    align-items: flex-start;
    margin-bottom: 1rem;
}

.lesson-info h4 {
    color: var(--text-primary);
    margin-bottom: 0.5rem;
    font-size: 1.1rem;
}

.lesson-info p {
    color: var(--text-secondary);
    font-size: 0.9rem;
    line-height: 1.5;
}

.lesson-status {
    display: flex;
    align-items: center;
    gap: 0.5rem;
    padding: 0.5rem 1rem;
    border-radius: 20px;
    font-size: 0.8rem;
    font-weight: 500;
}

.lesson-status.not-started {
    background: var(--warning-bg);
    color: var(--warning-color);
}

.lesson-status.in-progress {
    background: var(--info-bg);
    color: var(--info-color);
}

.lesson-status.completed {
    background: var(--success-bg);
    color: var(--success-color);
}

.lesson-meta {
    display: flex;
    justify-content: space-between;
    align-items: center;
    margin-top: 1rem;
    padding-top: 1rem;
    border-top: 1px solid var(--border-color);
}

.lesson-duration {
    color: var(--text-secondary);
    font-size: 0.9rem;
    display: flex;
    align-items: center;
    gap: 0.5rem;
}

.lesson-progress {
    display: flex;
    align-items: center;
    gap: 0.5rem;
}

.progress-bar {
    width: 100px;
    height: 6px;
    background: var(--bg-secondary);
    border-radius: 3px;
    overflow: hidden;
}

.progress-fill {
    height: 100%;
    background: var(--primary-color);
    transition: width 0.3s ease;
}

.chat-container {
    background: var(--card-bg);
    border: 1px solid var(--border-color);
    border-radius: 12px;
    height: 600px;
    display: flex;
    flex-direction: column;
    overflow: hidden;
}

.chat-header {
    background: var(--bg-secondary);
    padding: 1rem 1.5rem;
    border-bottom: 1px solid var(--border-color);
    display: flex;
    justify-content: space-between;
    align-items: center;
}

.chat-header h3 {
    color: var(--text-primary);
    margin: 0;
    font-size: 1.2rem;
}

.chat-actions {
    display: flex;
    gap: 0.5rem;
}

.chat-messages {
    flex: 1;
    overflow-y: auto;
    padding: 1rem;
    display: flex;
    flex-direction: column;
    gap: 1rem;
}

.chat-message {
    display: flex;
    gap: 1rem;
    max-width: 80%;
}

.chat-message.own {
    align-self: flex-end;
    flex-direction: row-reverse;
}

.chat-message.own .message-content {
    background: var(--primary-color);
    color: white;
}

.message-avatar {
    width: 40px;
    height: 40px;
    border-radius: 50%;
    background: var(--primary-color);
    color: white;
    display: flex;
    align-items: center;
    justify-content: center;
    font-size: 0.9rem;
    font-weight: 600;
    flex-shrink: 0;
}

.message-content {
    background: var(--bg-secondary);
    padding: 0.75rem 1rem;
    border-radius: 12px;
    border-bottom-left-radius: 4px;
}

.chat-message.own .message-content {
    border-bottom-left-radius: 12px;
    border-bottom-right-radius: 4px;
}

.message-author {
    font-weight: 600;
    color: var(--text-primary);
    font-size: 0.9rem;
    margin-bottom: 0.25rem;
}

.message-text {
    color: var(--text-primary);
    line-height: 1.4;
    margin-bottom: 0.25rem;
}

.message-time {
    font-size: 0.75rem;
    color: var(--text-secondary);
    opacity: 0.8;
}

.chat-input-container {
    border-top: 1px solid var(--border-color);
    padding: 1rem;
    background: var(--bg-secondary);
}

.chat-input {
    display: flex;
    gap: 0.5rem;
    align-items: center;
}

.chat-input input {
    flex: 1;
    padding: 0.75rem 1rem;
    border: 1px solid var(--border-color);
    border-radius: 25px;
    background: var(--card-bg);
    color: var(--text-primary);
    font-size: 0.9rem;
    outline: none;
    transition: border-color 0.3s ease;
}

.chat-input input:focus {
    border-color: var(--primary-color);
}

.send-btn {
    width: 40px;
    height: 40px;
    border: none;
    background: var(--primary-color);
    color: white;
    border-radius: 50%;
    cursor: pointer;
    display: flex;
    align-items: center;
    justify-content: center;
    transition: all 0.3s ease;
}

.send-btn:hover {
    background: var(--primary-hover);
    transform: scale(1.05);
}

.send-btn:disabled {
    opacity: 0.5;
    cursor: not-allowed;
    transform: none;
}

.announcements-header {
    display: flex;
    justify-content: space-between;
    align-items: center;
    margin-bottom: 2rem;
    flex-wrap: wrap;
    gap: 1rem;
}

.announcements-header h3 {
    color: var(--text-primary);
    font-size: 1.5rem;
    margin: 0;
}

.announcements-stats {
    display: flex;
    gap: 2rem;
    flex-wrap: wrap;
}

.announcements-stats .stat-item {
    color: var(--text-secondary);
    font-size: 0.9rem;
}

.announcements-stats .stat-item strong {
    color: var(--primary-color);
}

.announcements-list {
    display: grid;
    gap: 1rem;
}

.announcement-item {
    background: var(--card-bg);
    border: 1px solid var(--border-color);
    border-radius: 12px;
    padding: 1.5rem;
    transition: all 0.3s ease;
    position: relative;
}

.announcement-item:hover {
    border-color: var(--primary-color);
    box-shadow: var(--shadow-md);
}

.announcement-item.unread {
    border-left: 4px solid var(--primary-color);
}

.announcement-item.unread::before {
    content: "";
    position: absolute;
    top: 1rem;
    right: 1rem;
    width: 8px;
    height: 8px;
    background: var(--primary-color);
    border-radius: 50%;
}

.announcement-header {
    display: flex;
    justify-content: space-between;
    align-items: flex-start;
    margin-bottom: 1rem;
}

.announcement-title {
    color: var(--text-primary);
    font-size: 1.1rem;
    font-weight: 600;
    margin: 0;
}

.announcement-priority {
    padding: 0.25rem 0.75rem;
    border-radius: 12px;
    font-size: 0.8rem;
    font-weight: 500;
}

.announcement-priority.high {
    background: var(--danger-bg);
    color: var(--danger-color);
}

.announcement-priority.medium {
    background: var(--warning-bg);
    color: var(--warning-color);
}

.announcement-priority.low {
    background: var(--info-bg);
    color: var(--info-color);
}

.announcement-content {
    color: var(--text-secondary);
    line-height: 1.6;
    margin-bottom: 1rem;
}

.announcement-meta {
    display: flex;
    justify-content: space-between;
    align-items: center;
    padding-top: 1rem;
    border-top: 1px solid var(--border-color);
    font-size: 0.9rem;
    color: var(--text-secondary);
}

.announcement-date {
    display: flex;
    align-items: center;
    gap: 0.5rem;
}

.announcement-author {
    display: flex;
    align-items: center;
    gap: 0.5rem;
}

@media (max-width: 768px) {
    .class-info-card {
        flex-direction: column;
        text-align: center;
    }

    .class-nav-tabs {
        flex-direction: column;
        gap: 0.5rem;
    }

    .class-tab {
        justify-content: flex-start;
    }

    .lessons-header,
    .announcements-header {
        flex-direction: column;
        align-items: flex-start;
    }

    .lessons-stats,
    .announcements-stats {
        gap: 1rem;
    }

    .chat-container {
        height: 500px;
    }

    .chat-message {
        max-width: 95%;
    }

    .class-meta {
        flex-direction: column;
        gap: 0.5rem;
    }

    .no-class-message {
        padding: 2rem 1rem;
    }
}

.assignments-access-check {
    display: flex;
    justify-content: center;
    align-items: center;
    min-height: 400px;
    padding: 2rem;
}

.assignments-content {
    animation: fadeIn 0.5s ease-in-out;
}

#studentEmailAssignments {
    color: var(--primary-color);
    font-weight: 600;
}

.assignments-stats-grid {
    display: grid;
    grid-template-columns: repeat(auto-fit, minmax(200px, 1fr));
    gap: 1.5rem;
    margin-bottom: 2rem;
}

.assignments-stats-grid .stat-card {
    background: var(--card-bg);
    border: 1px solid var(--border-color);
    border-radius: 12px;
    padding: 1.5rem;
    display: flex;
    align-items: center;
    gap: 1rem;
    transition: all 0.3s ease;
}

.assignments-stats-grid .stat-card:hover {
    border-color: var(--primary-color);
    box-shadow: var(--shadow-md);
    transform: translateY(-2px);
}

.assignments-stats-grid .stat-icon {
    width: 50px;
    height: 50px;
    border-radius: 50%;
    display: flex;
    align-items: center;
    justify-content: center;
    font-size: 1.5rem;
    flex-shrink: 0;
}

.assignments-stats-grid .stat-card:nth-child(1) .stat-icon {
    background: var(--warning-bg);
    color: var(--warning-color);
}

.assignments-stats-grid .stat-card:nth-child(2) .stat-icon {
    background: var(--info-bg);
    color: var(--info-color);
}

.assignments-stats-grid .stat-card:nth-child(3) .stat-icon {
    background: var(--success-bg);
    color: var(--success-color);
}

.assignments-stats-grid .stat-card:nth-child(4) .stat-icon {
    background: var(--danger-bg);
    color: var(--danger-color);
}

.assignments-stats-grid .stat-content {
    flex: 1;
}

.assignments-stats-grid .stat-number {
    font-size: 2rem;
    font-weight: 700;
    color: var(--text-primary);
    margin-bottom: 0.25rem;
}

.assignments-stats-grid .stat-label {
    color: var(--text-secondary);
    font-size: 0.9rem;
    font-weight: 500;
}

.assignments-filters {
    background: var(--card-bg);
    border: 1px solid var(--border-color);
    border-radius: 12px;
    padding: 1.5rem;
    margin-bottom: 2rem;
    display: flex;
    gap: 1.5rem;
    align-items: center;
    flex-wrap: wrap;
}

.assignments-filters .filter-group {
    display: flex;
    flex-direction: column;
    gap: 0.5rem;
    min-width: 150px;
}

.assignments-filters .filter-group label {
    color: var(--text-secondary);
    font-size: 0.9rem;
    font-weight: 500;
}

.assignments-filters .filter-select {
    padding: 0.5rem 1rem;
    border: 1px solid var(--border-color);
    border-radius: 8px;
    background: var(--bg-primary);
    color: var(--text-primary);
    font-size: 0.9rem;
    outline: none;
    transition: border-color 0.3s ease;
}

.assignments-filters .filter-select:focus {
    border-color: var(--primary-color);
}

.filter-actions {
    margin-left: auto;
}

.filter-actions .action-btn {
    width: 40px;
    height: 40px;
    border: none;
    background: var(--primary-color);
    color: white;
    border-radius: 8px;
    cursor: pointer;
    display: flex;
    align-items: center;
    justify-content: center;
    transition: all 0.3s ease;
}

.filter-actions .action-btn:hover {
    background: var(--primary-hover);
    transform: scale(1.05);
}

.assignments-list {
    display: grid;
    gap: 1.5rem;
}

.assignment-item {
    background: var(--card-bg);
    border: 1px solid var(--border-color);
    border-radius: 12px;
    padding: 1.5rem;
    transition: all 0.3s ease;
    position: relative;
    overflow: hidden;
}

.assignment-item:hover {
    border-color: var(--primary-color);
    box-shadow: var(--shadow-md);
    transform: translateY(-2px);
}

.assignment-item.overdue {
    border-left: 4px solid var(--danger-color);
}

.assignment-item.completed {
    border-left: 4px solid var(--success-color);
    opacity: 0.8;
}

.assignment-item.in-progress {
    border-left: 4px solid var(--info-color);
}

.assignment-header {
    display: flex;
    justify-content: space-between;
    align-items: flex-start;
    margin-bottom: 1rem;
}

.assignment-info h3 {
    color: var(--text-primary);
    margin-bottom: 0.5rem;
    font-size: 1.2rem;
}

.assignment-info .assignment-type {
    color: var(--text-secondary);
    font-size: 0.9rem;
    font-weight: 500;
    margin-bottom: 0.5rem;
}

.assignment-info .assignment-description {
    color: var(--text-secondary);
    line-height: 1.6;
    margin-bottom: 1rem;
}

.assignment-status {
    display: flex;
    align-items: center;
    gap: 0.5rem;
    padding: 0.5rem 1rem;
    border-radius: 20px;
    font-size: 0.8rem;
    font-weight: 500;
    white-space: nowrap;
}

.assignment-status.pending {
    background: var(--warning-bg);
    color: var(--warning-color);
}

.assignment-status.in-progress {
    background: var(--info-bg);
    color: var(--info-color);
}

.assignment-status.completed {
    background: var(--success-bg);
    color: var(--success-color);
}

.assignment-status.overdue {
    background: var(--danger-bg);
    color: var(--danger-color);
}

.assignment-meta {
    display: flex;
    justify-content: space-between;
    align-items: center;
    margin-top: 1rem;
    padding-top: 1rem;
    border-top: 1px solid var(--border-color);
    flex-wrap: wrap;
    gap: 1rem;
}

.assignment-due-date {
    display: flex;
    align-items: center;
    gap: 0.5rem;
    color: var(--text-secondary);
    font-size: 0.9rem;
}

.assignment-due-date.overdue {
    color: var(--danger-color);
    font-weight: 600;
}

.assignment-priority {
    display: flex;
    align-items: center;
    gap: 0.5rem;
    padding: 0.25rem 0.75rem;
    border-radius: 12px;
    font-size: 0.8rem;
    font-weight: 500;
}

.assignment-priority.high {
    background: var(--danger-bg);
    color: var(--danger-color);
}

.assignment-priority.medium {
    background: var(--warning-bg);
    color: var(--warning-color);
}

.assignment-priority.low {
    background: var(--info-bg);
    color: var(--info-color);
}

.assignment-actions {
    display: flex;
    gap: 0.5rem;
}

.assignment-action-btn {
    padding: 0.5rem 1rem;
    border: none;
    border-radius: 8px;
    cursor: pointer;
    font-size: 0.9rem;
    font-weight: 500;
    transition: all 0.3s ease;
    display: flex;
    align-items: center;
    gap: 0.5rem;
}

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

.assignment-action-btn.primary:hover {
    background: var(--primary-hover);
}

.assignment-action-btn.secondary {
    background: var(--bg-secondary);
    color: var(--text-primary);
    border: 1px solid var(--border-color);
}

.assignment-action-btn.secondary:hover {
    background: var(--bg-primary);
    border-color: var(--primary-color);
}

.assignment-progress {
    margin-top: 1rem;
}

.assignment-progress-label {
    display: flex;
    justify-content: space-between;
    align-items: center;
    margin-bottom: 0.5rem;
    font-size: 0.9rem;
}

.assignment-progress-label .progress-text {
    color: var(--text-secondary);
}

.assignment-progress-label .progress-percentage {
    color: var(--primary-color);
    font-weight: 600;
}

.assignment-progress-bar {
    height: 6px;
    background: var(--bg-secondary);
    border-radius: 3px;
    overflow: hidden;
}

.assignment-progress-fill {
    height: 100%;
    background: var(--primary-color);
    transition: width 0.3s ease;
}

.assignment-modal {
    position: fixed;
    top: 0;
    left: 0;
    right: 0;
    bottom: 0;
    background: rgba(0, 0, 0, 0.5);
    display: flex;
    align-items: center;
    justify-content: center;
    z-index: 1000;
    padding: 1rem;
}

.assignment-modal-content {
    background: var(--card-bg);
    border-radius: 12px;
    padding: 2rem;
    max-width: 600px;
    width: 100%;
    max-height: 80vh;
    overflow-y: auto;
    position: relative;
}

.assignment-modal-header {
    display: flex;
    justify-content: space-between;
    align-items: center;
    margin-bottom: 1.5rem;
    padding-bottom: 1rem;
    border-bottom: 1px solid var(--border-color);
}

.assignment-modal-header h3 {
    color: var(--text-primary);
    margin: 0;
}

.assignment-modal-close {
    background: none;
    border: none;
    font-size: 1.5rem;
    color: var(--text-secondary);
    cursor: pointer;
    padding: 0.5rem;
    border-radius: 50%;
    transition: all 0.3s ease;
}

.assignment-modal-close:hover {
    background: var(--bg-secondary);
    color: var(--text-primary);
}

.assignment-modal-body {
    color: var(--text-secondary);
    line-height: 1.6;
}

.assignment-modal-footer {
    display: flex;
    justify-content: flex-end;
    gap: 1rem;
    margin-top: 2rem;
    padding-top: 1rem;
    border-top: 1px solid var(--border-color);
}

@media (max-width: 768px) {
    .assignments-stats-grid {
        grid-template-columns: repeat(2, 1fr);
        gap: 1rem;
    }

    .assignments-filters {
        flex-direction: column;
        align-items: stretch;
    }

    .assignments-filters .filter-group {
        min-width: auto;
    }

    .filter-actions {
        margin-left: 0;
        align-self: center;
    }

    .assignment-header {
        flex-direction: column;
        gap: 1rem;
    }

    .assignment-meta {
        flex-direction: column;
        align-items: flex-start;
    }

    .assignment-actions {
        width: 100%;
        justify-content: space-between;
    }

    .assignment-action-btn {
        flex: 1;
        justify-content: center;
    }
}

@media (max-width: 480px) {
    .assignments-stats-grid {
        grid-template-columns: 1fr;
    }

    .assignments-stats-grid .stat-card {
        padding: 1rem;
    }

    .assignments-stats-grid .stat-number {
    font-size: 1.5rem;
    }
}

.grades-access-check {
    display: flex;
    justify-content: center;
    align-items: center;
    min-height: 400px;
    padding: 2rem;
}

.grades-content {
    animation: fadeIn 0.5s ease-in-out;
}

#studentEmailGrades {
    color: var(--primary-color);
    font-weight: 600;
}

.grades-overview {
    background: var(--card-bg);
    border: 1px solid var(--border-color);
    border-radius: 12px;
    padding: 2rem;
    margin-bottom: 2rem;
    box-shadow: var(--shadow-sm);
}

.grade-stats {
    display: grid;
    grid-template-columns: repeat(auto-fit, minmax(200px, 1fr));
    gap: 2rem;
}

.grade-stats .stat-item {
    text-align: center;
    padding: 1rem;
    background: var(--bg-secondary);
    border-radius: 8px;
    border: 1px solid var(--border-color);
    transition: all 0.3s ease;
}

.grade-stats .stat-item:hover {
    border-color: var(--primary-color);
    transform: translateY(-2px);
}

.grade-stats .stat-label {
    color: var(--text-secondary);
    font-size: 0.9rem;
    font-weight: 500;
    margin-bottom: 0.5rem;
}

.grade-stats .stat-value {
    color: var(--text-primary);
    font-size: 2rem;
    font-weight: 700;
    margin-bottom: 0.5rem;
}

.grade-stats .stat-item:nth-child(1) .stat-value {
    color: var(--primary-color);
}

.grade-stats .stat-item:nth-child(2) .stat-value {
    color: var(--success-color);
}

.grade-stats .stat-item:nth-child(3) .stat-value {
    color: var(--info-color);
}

.grade-stats .stat-item:nth-child(4) .stat-value {
    color: var(--warning-color);
}

.grades-chart-container {
    background: var(--card-bg);
    border: 1px solid var(--border-color);
    border-radius: 12px;
    padding: 2rem;
    margin-bottom: 2rem;
    box-shadow: var(--shadow-sm);
}

.chart-header {
    display: flex;
    justify-content: space-between;
    align-items: center;
    margin-bottom: 1.5rem;
    flex-wrap: wrap;
    gap: 1rem;
}

.chart-header h3 {
    color: var(--text-primary);
    margin: 0;
    font-size: 1.2rem;
}

.chart-legend {
    display: flex;
    gap: 1rem;
    flex-wrap: wrap;
}

.legend-item {
    display: flex;
    align-items: center;
    gap: 0.5rem;
    font-size: 0.9rem;
    color: var(--text-secondary);
}

.legend-color {
    width: 12px;
    height: 12px;
    border-radius: 50%;
}

.legend-color.excellent {
    background: var(--success-color);
}

.legend-color.good {
    background: var(--info-color);
}

.legend-color.average {
    background: var(--warning-color);
}

.legend-color.poor {
    background: var(--danger-color);
}

.grades-chart {
    min-height: 300px;
    display: flex;
    align-items: center;
    justify-content: center;
    position: relative;
}

.grades-filters {
    background: var(--card-bg);
    border: 1px solid var(--border-color);
    border-radius: 12px;
    padding: 1.5rem;
    margin-bottom: 2rem;
    display: flex;
    gap: 1.5rem;
    align-items: center;
    flex-wrap: wrap;
}

.grades-filters .filter-group {
    display: flex;
    flex-direction: column;
    gap: 0.5rem;
    min-width: 150px;
}

.grades-filters .filter-group label {
    color: var(--text-secondary);
    font-size: 0.9rem;
    font-weight: 500;
}

.grades-filters .filter-select {
    padding: 0.5rem 1rem;
    border: 1px solid var(--border-color);
    border-radius: 8px;
    background: var(--bg-primary);
    color: var(--text-primary);
    font-size: 0.9rem;
    outline: none;
    transition: border-color 0.3s ease;
}

.grades-filters .filter-select:focus {
    border-color: var(--primary-color);
}

.grades-list {
    display: grid;
    gap: 1.5rem;
}

.grade-item {
    background: var(--card-bg);
    border: 1px solid var(--border-color);
    border-radius: 12px;
    padding: 1.5rem;
    transition: all 0.3s ease;
    position: relative;
    overflow: hidden;
}

.grade-item:hover {
    border-color: var(--primary-color);
    box-shadow: var(--shadow-md);
    transform: translateY(-2px);
}

.grade-item.excellent {
    border-left: 4px solid var(--success-color);
}

.grade-item.good {
    border-left: 4px solid var(--info-color);
}

.grade-item.average {
    border-left: 4px solid var(--warning-color);
}

.grade-item.poor {
    border-left: 4px solid var(--danger-color);
}

.grade-header {
    display: flex;
    justify-content: space-between;
    align-items: flex-start;
    margin-bottom: 1rem;
}

.grade-info h3 {
    color: var(--text-primary);
    margin-bottom: 0.5rem;
    font-size: 1.2rem;
}

.grade-info .grade-type {
    color: var(--text-secondary);
    font-size: 0.9rem;
    font-weight: 500;
    margin-bottom: 0.5rem;
}

.grade-info .grade-description {
    color: var(--text-secondary);
    line-height: 1.6;
    margin-bottom: 1rem;
}

.grade-value {
    display: flex;
    align-items: center;
    gap: 0.5rem;
    padding: 0.75rem 1.5rem;
    border-radius: 50px;
    font-size: 1.5rem;
    font-weight: 700;
    white-space: nowrap;
    min-width: 80px;
    justify-content: center;
}

.grade-value.excellent {
    background: var(--success-bg);
    color: var(--success-color);
}

.grade-value.good {
    background: var(--info-bg);
    color: var(--info-color);
}

.grade-value.average {
    background: var(--warning-bg);
    color: var(--warning-color);
}

.grade-value.poor {
    background: var(--danger-bg);
    color: var(--danger-color);
}

.grade-meta {
    display: flex;
    justify-content: space-between;
    align-items: center;
    margin-top: 1rem;
    padding-top: 1rem;
    border-top: 1px solid var(--border-color);
    flex-wrap: wrap;
    gap: 1rem;
}

.grade-date {
    display: flex;
    align-items: center;
    gap: 0.5rem;
    color: var(--text-secondary);
    font-size: 0.9rem;
}

.grade-teacher {
    display: flex;
    align-items: center;
    gap: 0.5rem;
    color: var(--text-secondary);
    font-size: 0.9rem;
}

.grade-feedback {
    margin-top: 1rem;
    padding: 1rem;
    background: var(--bg-secondary);
    border-radius: 8px;
    border-left: 4px solid var(--primary-color);
}

.grade-feedback h4 {
    color: var(--text-primary);
    margin-bottom: 0.5rem;
    font-size: 1rem;
}

.grade-feedback p {
    color: var(--text-secondary);
    line-height: 1.6;
    margin: 0;
}

.grade-modal {
    position: fixed;
    top: 0;
    left: 0;
    right: 0;
    bottom: 0;
    background: rgba(0, 0, 0, 0.5);
    display: flex;
    align-items: center;
    justify-content: center;
    z-index: 1000;
    padding: 1rem;
}

.grade-modal-content {
    background: var(--card-bg);
    border-radius: 12px;
    padding: 2rem;
    max-width: 600px;
    width: 100%;
    max-height: 80vh;
    overflow-y: auto;
    position: relative;
}

.grade-modal-header {
    display: flex;
    justify-content: space-between;
    align-items: center;
    margin-bottom: 1.5rem;
    padding-bottom: 1rem;
    border-bottom: 1px solid var(--border-color);
}

.grade-modal-header h3 {
    color: var(--text-primary);
    margin: 0;
}

.grade-modal-close {
    background: none;
    border: none;
    font-size: 1.5rem;
    color: var(--text-secondary);
    cursor: pointer;
    padding: 0.5rem;
    border-radius: 50%;
    transition: all 0.3s ease;
}

.grade-modal-close:hover {
    background: var(--bg-secondary);
    color: var(--text-primary);
}

.grade-modal-body {
    color: var(--text-secondary);
    line-height: 1.6;
}

.grade-modal-footer {
    display: flex;
    justify-content: flex-end;
    gap: 1rem;
    margin-top: 2rem;
    padding-top: 1rem;
    border-top: 1px solid var(--border-color);
}

@media (max-width: 768px) {
    .grade-stats {
        grid-template-columns: repeat(2, 1fr);
        gap: 1rem;
    }

    .grades-filters {
        flex-direction: column;
        align-items: stretch;
    }

    .grades-filters .filter-group {
        min-width: auto;
    }

    .chart-header {
        flex-direction: column;
        align-items: flex-start;
    }

    .chart-legend {
        gap: 0.5rem;
    }

    .grade-header {
        flex-direction: column;
        gap: 1rem;
    }

    .grade-meta {
        flex-direction: column;
        align-items: flex-start;
    }

    .grade-value {
        font-size: 1.2rem;
        padding: 0.5rem 1rem;
    }
}

@media (max-width: 480px) {
    .grade-stats {
        grid-template-columns: 1fr;
    }

    .grade-stats .stat-value {
        font-size: 1.5rem;
    }

    .legend-item {
        font-size: 0.8rem;
    }

    .grades-chart-container,
    .grades-overview {
        padding: 1rem;
    }
}

.materials-access-check {
    padding: 2rem;
    text-align: center;
}

.materials-content {
    padding: 2rem;
}

#studentEmailMaterials {
    color: var(--primary-color);
    font-weight: 600;
}

.materials-stats-grid {
    display: grid;
    grid-template-columns: repeat(auto-fit, minmax(250px, 1fr));
    gap: 1.5rem;
    margin-bottom: 2rem;
}

.materials-stats-grid .stat-card {
    background: var(--bg-primary);
    border-radius: var(--border-radius);
    padding: 1.5rem;
    box-shadow: 0 2px 10px var(--shadow-light);
    transition: all var(--transition-fast);
    border: 1px solid var(--border-color);
}

.materials-stats-grid .stat-card:hover {
    transform: translateY(-2px);
    box-shadow: 0 4px 20px var(--shadow-medium);
}

.materials-stats-grid .stat-icon {
    width: 48px;
    height: 48px;
    border-radius: 50%;
    display: flex;
    align-items: center;
    justify-content: center;
    font-size: 1.5rem;
    color: white;
    margin-bottom: 1rem;
}

.materials-stats-grid .stat-card:nth-child(1) .stat-icon {
    background: linear-gradient(135deg, var(--primary-color), var(--primary-dark));
}

.materials-stats-grid .stat-card:nth-child(2) .stat-icon {
    background: linear-gradient(135deg, var(--success-color), #059669);
}

.materials-stats-grid .stat-card:nth-child(3) .stat-icon {
    background: linear-gradient(135deg, var(--warning-color), #d97706);
}

.materials-stats-grid .stat-card:nth-child(4) .stat-icon {
    background: linear-gradient(135deg, var(--secondary-color), #7c3aed);
}

.materials-stats-grid .stat-content {
    flex: 1;
}

.materials-stats-grid .stat-number {
    font-size: 2rem;
    font-weight: 700;
    color: var(--text-primary);
    margin-bottom: 0.5rem;
}

.materials-stats-grid .stat-label {
    font-size: 0.9rem;
    color: var(--text-secondary);
    font-weight: 500;
}

.materials-filters {
    display: flex;
    gap: 1.5rem;
    margin-bottom: 2rem;
    padding: 1.5rem;
    background: var(--bg-primary);
    border-radius: var(--border-radius);
    border: 1px solid var(--border-color);
    flex-wrap: wrap;
}

.materials-filters .filter-group {
    display: flex;
    flex-direction: column;
    gap: 0.5rem;
    min-width: 200px;
}

.materials-filters .filter-group label {
    font-weight: 600;
    color: var(--text-primary);
    font-size: 0.9rem;
}

.materials-filters .filter-select {
    padding: 0.75rem 1rem;
    border: 1px solid var(--border-color);
    border-radius: var(--border-radius);
    background: var(--bg-secondary);
    color: var(--text-primary);
    font-size: 0.9rem;
    transition: all var(--transition-fast);
}

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

.materials-list {
    display: flex;
    flex-direction: column;
    gap: 1rem;
}

.material-item {
    background: var(--bg-primary);
    border-radius: var(--border-radius);
    padding: 1.5rem;
    border: 1px solid var(--border-color);
    transition: all var(--transition-fast);
}

.material-item:hover {
    transform: translateY(-2px);
    box-shadow: 0 4px 20px var(--shadow-medium);
    border-color: var(--primary-color);
}

.material-header {
    display: flex;
    justify-content: space-between;
    align-items: flex-start;
    margin-bottom: 1rem;
    gap: 1rem;
}

.material-info h3 {
    color: var(--text-primary);
    margin-bottom: 0.5rem;
    font-size: 1.1rem;
    font-weight: 600;
}

.material-info .material-description {
    color: var(--text-secondary);
    font-size: 0.9rem;
    line-height: 1.5;
}

.material-meta {
    display: flex;
    gap: 1rem;
    align-items: center;
    flex-wrap: wrap;
}

.material-type {
    padding: 0.5rem 1rem;
    border-radius: 20px;
    font-size: 0.8rem;
    font-weight: 600;
    text-transform: uppercase;
    letter-spacing: 0.5px;
}

.material-type.document {
    background: rgba(59, 130, 246, 0.1);
    color: var(--primary-color);
}

.material-type.video {
    background: rgba(239, 68, 68, 0.1);
    color: var(--error-color);
}

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

.material-type.code {
    background: rgba(139, 92, 246, 0.1);
    color: var(--secondary-color);
}

.material-size {
    font-size: 0.8rem;
    color: var(--text-muted);
    background: var(--bg-secondary);
    padding: 0.25rem 0.75rem;
    border-radius: 12px;
}

.material-details {
    display: flex;
    justify-content: space-between;
    align-items: center;
    margin-bottom: 1rem;
    gap: 1rem;
    flex-wrap: wrap;
}

.material-date,
.material-author {
    display: flex;
    align-items: center;
    gap: 0.5rem;
    color: var(--text-secondary);
    font-size: 0.9rem;
}

.material-date i,
.material-author i {
    color: var(--primary-color);
}

.material-actions {
    display: flex;
    gap: 0.75rem;
    flex-wrap: wrap;
}

.material-actions .btn {
    padding: 0.5rem 1rem;
    border-radius: var(--border-radius);
    font-size: 0.9rem;
    font-weight: 500;
    text-decoration: none;
    transition: all var(--transition-fast);
    border: none;
    cursor: pointer;
    display: flex;
    align-items: center;
    gap: 0.5rem;
}

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

.material-actions .btn.btn-primary:hover {
    background: var(--primary-dark);
    transform: translateY(-1px);
}

.material-actions .btn.btn-outline {
    background: transparent;
    color: var(--primary-color);
    border: 1px solid var(--primary-color);
}

.material-actions .btn.btn-outline:hover {
    background: var(--primary-color);
    color: white;
    transform: translateY(-1px);
}

.access-denied {
    display: flex;
    flex-direction: column;
    align-items: center;
    justify-content: center;
    padding: 3rem 2rem;
    text-align: center;
    background: var(--bg-primary);
    border-radius: var(--border-radius);
    border: 1px solid var(--border-color);
}

.access-denied-content {
    max-width: 500px;
}

.access-denied i {
    font-size: 4rem;
    color: var(--warning-color);
    margin-bottom: 1.5rem;
}

.access-denied h3 {
    color: var(--text-primary);
    margin-bottom: 1rem;
    font-size: 1.5rem;
}

.access-denied p {
    color: var(--text-secondary);
    margin-bottom: 1.5rem;
    line-height: 1.6;
}

.access-denied-info {
    background: var(--bg-secondary);
    padding: 1.5rem;
    border-radius: var(--border-radius);
    border-left: 4px solid var(--primary-color);
}

.access-denied-info p {
    margin-bottom: 1rem;
    font-weight: 600;
    color: var(--text-primary);
}

.access-denied-info ul {
    list-style: none;
    padding: 0;
    margin: 0;
}

.access-denied-info li {
    padding: 0.5rem 0;
    color: var(--text-secondary);
    position: relative;
    padding-left: 1.5rem;
}

.access-denied-info li:before {
    content: "•";
    color: var(--primary-color);
    position: absolute;
    left: 0;
    font-weight: bold;
}

@media (max-width: 768px) {
    .materials-stats-grid {
        grid-template-columns: repeat(2, 1fr);
        gap: 1rem;
    }

    .materials-filters {
        flex-direction: column;
        gap: 1rem;
    }

    .materials-filters .filter-group {
        min-width: auto;
    }

    .material-header {
        flex-direction: column;
        gap: 1rem;
    }

    .material-meta {
        justify-content: flex-start;
    }

    .material-details {
        flex-direction: column;
        align-items: flex-start;
        gap: 0.5rem;
    }

    .material-actions {
        justify-content: flex-start;
    }

    .access-denied {
        padding: 2rem 1rem;
    }

    .access-denied i {
        font-size: 3rem;
    }
}

@media (max-width: 480px) {
    .materials-stats-grid {
        grid-template-columns: 1fr;
    }

    .materials-stats-grid .stat-number {
        font-size: 1.5rem;
    }

    .material-actions .btn {
        flex: 1;
        justify-content: center;
    }

    .access-denied-info {
    padding: 1rem;
    }
}

.announcements-access-check {
    padding: 2rem;
    text-align: center;
}

.announcements-content {
    padding: 2rem;
}

#studentEmailAnnouncements {
    color: var(--primary-color);
    font-weight: 600;
}

.announcements-stats-grid {
    display: grid;
    grid-template-columns: repeat(auto-fit, minmax(250px, 1fr));
    gap: 1.5rem;
    margin-bottom: 2rem;
}

.announcements-stats-grid .stat-card {
    background: var(--bg-primary);
    border-radius: var(--border-radius);
    padding: 1.5rem;
    box-shadow: 0 2px 10px var(--shadow-light);
    transition: all var(--transition-fast);
    border: 1px solid var(--border-color);
}

.announcements-stats-grid .stat-card:hover {
    transform: translateY(-2px);
    box-shadow: 0 4px 20px var(--shadow-medium);
}

.announcements-stats-grid .stat-icon {
    width: 48px;
    height: 48px;
    border-radius: 50%;
    display: flex;
    align-items: center;
    justify-content: center;
    font-size: 1.5rem;
    color: white;
    margin-bottom: 1rem;
}

.announcements-stats-grid .stat-card:nth-child(1) .stat-icon {
    background: linear-gradient(135deg, var(--primary-color), var(--primary-dark));
}

.announcements-stats-grid .stat-card:nth-child(2) .stat-icon {
    background: linear-gradient(135deg, var(--error-color), #dc2626);
}

.announcements-stats-grid .stat-card:nth-child(3) .stat-icon {
    background: linear-gradient(135deg, var(--warning-color), #d97706);
}

.announcements-stats-grid .stat-card:nth-child(4) .stat-icon {
    background: linear-gradient(135deg, var(--success-color), #059669);
}

.announcements-stats-grid .stat-content {
    flex: 1;
}

.announcements-stats-grid .stat-number {
    font-size: 2rem;
    font-weight: 700;
    color: var(--text-primary);
    margin-bottom: 0.5rem;
}

.announcements-stats-grid .stat-label {
    font-size: 0.9rem;
    color: var(--text-secondary);
    font-weight: 500;
}

.announcements-filters {
    display: flex;
    gap: 1.5rem;
    margin-bottom: 2rem;
    padding: 1.5rem;
    background: var(--bg-primary);
    border-radius: var(--border-radius);
    border: 1px solid var(--border-color);
    flex-wrap: wrap;
}

.announcements-filters .filter-group {
    display: flex;
    flex-direction: column;
    gap: 0.5rem;
    min-width: 200px;
}

.announcements-filters .filter-group label {
    font-weight: 600;
    color: var(--text-primary);
    font-size: 0.9rem;
}

.announcements-filters .filter-select {
    padding: 0.75rem 1rem;
    border: 1px solid var(--border-color);
    border-radius: var(--border-radius);
    background: var(--bg-secondary);
    color: var(--text-primary);
    font-size: 0.9rem;
    transition: all var(--transition-fast);
}

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

.announcements-list {
    display: flex;
    flex-direction: column;
    gap: 1rem;
}

.announcement-item {
    background: var(--bg-primary);
    border-radius: var(--border-radius);
    padding: 1.5rem;
    border: 1px solid var(--border-color);
    transition: all var(--transition-fast);
    position: relative;
}

.announcement-item:hover {
    transform: translateY(-2px);
    box-shadow: 0 4px 20px var(--shadow-medium);
    border-color: var(--primary-color);
}

.announcement-item.unread {
    border-left: 4px solid var(--primary-color);
    background: linear-gradient(90deg, rgba(59, 130, 246, 0.05) 0%, var(--bg-primary) 100%);
}

.announcement-item.unread::before {
    content: "";
    position: absolute;
    top: 1rem;
    right: 1rem;
    width: 8px;
    height: 8px;
    background: var(--primary-color);
    border-radius: 50%;
    animation: pulse 2s infinite;
}

.announcement-header {
    display: flex;
    justify-content: space-between;
    align-items: flex-start;
    margin-bottom: 1rem;
    gap: 1rem;
}

.announcement-info h3 {
    color: var(--text-primary);
    margin-bottom: 0.5rem;
    font-size: 1.1rem;
    font-weight: 600;
}

.announcement-info .announcement-author {
    color: var(--text-secondary);
    font-size: 0.9rem;
}

.announcement-meta {
    display: flex;
    gap: 0.75rem;
    align-items: center;
    flex-wrap: wrap;
}

.announcement-category {
    padding: 0.5rem 1rem;
    border-radius: 20px;
    font-size: 0.8rem;
    font-weight: 600;
    text-transform: uppercase;
    letter-spacing: 0.5px;
}

.announcement-category.general {
    background: rgba(107, 114, 128, 0.1);
    color: #6b7280;
}

.announcement-category.academic {
    background: rgba(59, 130, 246, 0.1);
    color: var(--primary-color);
}

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

.announcement-category.technical {
    background: rgba(139, 92, 246, 0.1);
    color: var(--secondary-color);
}

.announcement-category.important {
    background: rgba(239, 68, 68, 0.1);
    color: var(--error-color);
}

.announcement-priority {
    padding: 0.25rem 0.75rem;
    border-radius: 12px;
    font-size: 0.75rem;
    font-weight: 600;
    text-transform: uppercase;
    letter-spacing: 0.5px;
}

.announcement-priority.low {
    background: rgba(107, 114, 128, 0.1);
    color: #6b7280;
}

.announcement-priority.medium {
    background: rgba(59, 130, 246, 0.1);
    color: var(--primary-color);
}

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

.announcement-priority.urgent {
    background: rgba(239, 68, 68, 0.1);
    color: var(--error-color);
    animation: pulse 2s infinite;
}

.announcement-content {
    color: var(--text-primary);
    line-height: 1.6;
    margin-bottom: 1rem;
    padding: 1rem;
    background: var(--bg-secondary);
    border-radius: var(--border-radius);
    border-left: 3px solid var(--primary-color);
}

.announcement-footer {
    display: flex;
    justify-content: space-between;
    align-items: center;
    gap: 1rem;
    flex-wrap: wrap;
}

.announcement-date {
    display: flex;
    align-items: center;
    gap: 0.5rem;
    color: var(--text-secondary);
    font-size: 0.9rem;
}

.announcement-date i {
    color: var(--primary-color);
}

.announcement-actions {
    display: flex;
    gap: 0.75rem;
    align-items: center;
}

.announcement-actions .btn {
    padding: 0.5rem 1rem;
    border-radius: var(--border-radius);
    font-size: 0.85rem;
    font-weight: 500;
    text-decoration: none;
    transition: all var(--transition-fast);
    border: none;
    cursor: pointer;
    display: flex;
    align-items: center;
    gap: 0.5rem;
}

.announcement-actions .btn.btn-outline {
    background: transparent;
    color: var(--primary-color);
    border: 1px solid var(--primary-color);
}

.announcement-actions .btn.btn-outline:hover {
    background: var(--primary-color);
    color: white;
    transform: translateY(-1px);
}

.announcement-actions .btn.btn-sm {
    padding: 0.375rem 0.75rem;
    font-size: 0.8rem;
}

.read-indicator {
    display: flex;
    align-items: center;
    gap: 0.5rem;
    color: var(--success-color);
    font-size: 0.85rem;
    font-weight: 500;
}

.read-indicator i {
    color: var(--success-color);
}

@media (max-width: 768px) {
    .announcements-stats-grid {
        grid-template-columns: repeat(2, 1fr);
        gap: 1rem;
    }

    .announcements-filters {
        flex-direction: column;
        gap: 1rem;
    }

    .announcements-filters .filter-group {
        min-width: auto;
    }

    .announcement-header {
        flex-direction: column;
        gap: 1rem;
    }

    .announcement-meta {
        justify-content: flex-start;
    }

    .announcement-footer {
        flex-direction: column;
        align-items: flex-start;
        gap: 0.75rem;
    }

    .announcement-actions {
        justify-content: flex-start;
    }

    .access-denied {
        padding: 2rem 1rem;
    }

    .access-denied i {
        font-size: 3rem;
    }
}

@media (max-width: 480px) {
    .announcements-stats-grid {
        grid-template-columns: 1fr;
    }

    .announcements-stats-grid .stat-number {
        font-size: 1.5rem;
    }

    .announcement-actions .btn {
    flex: 1;
        justify-content: center;
    }

    .announcement-meta {
        flex-direction: column;
        align-items: flex-start;
        gap: 0.5rem;
    }

    .access-denied-info {
        padding: 1rem;
    }
}

.rooms-tabs {
    display: flex;
    gap: 1rem;
    margin-bottom: 2rem;
    border-bottom: 2px solid var(--border-color);
}

.tab-btn {
    display: flex;
    align-items: center;
    gap: 0.5rem;
    padding: 1rem 1.5rem;
    background: none;
    border: none;
    color: var(--text-secondary);
    font-size: 1rem;
    font-weight: 500;
    cursor: pointer;
    border-bottom: 3px solid transparent;
    transition: all 0.3s ease;
}

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

.tab-btn.active {
    color: var(--primary-color);
    border-bottom-color: var(--primary-color);
}

.tab-content {
    display: none;
}

.tab-content.active {
    display: block;
}

.public-rooms-header {
    display: flex;
    justify-content: space-between;
    align-items: center;
    margin-bottom: 2rem;
    gap: 2rem;
}

.header-actions {
    display: flex;
    gap: 1rem;
}

.search-filter {
    display: flex;
    gap: 1rem;
    align-items: center;
}

.search-box {
    position: relative;
    display: flex;
    align-items: center;
}

.search-box i {
    position: absolute;
    left: 1rem;
    color: var(--text-secondary);
    z-index: 1;
}

.search-box input {
    padding: 0.75rem 1rem 0.75rem 2.5rem;
    border: 2px solid var(--border-color);
    border-radius: 8px;
    background: var(--card-background);
    color: var(--text-primary);
    font-size: 0.9rem;
    width: 250px;
    transition: border-color 0.3s ease;
}

.search-box input:focus {
    outline: none;
    border-color: var(--primary-color);
}

.filter-select {
    padding: 0.75rem 1rem;
    border: 2px solid var(--border-color);
    border-radius: 8px;
    background: var(--card-background);
    color: var(--text-primary);
    font-size: 0.9rem;
    cursor: pointer;
    transition: border-color 0.3s ease;
}

.filter-select:focus {
    outline: none;
    border-color: var(--primary-color);
}

.rooms-grid {
    display: grid;
    grid-template-columns: repeat(auto-fill, minmax(350px, 1fr));
    gap: 1.5rem;
}

.room-card {
    background: var(--card-background);
    border: 2px solid var(--border-color);
    border-radius: 12px;
    padding: 1.5rem;
    transition: all 0.3s ease;
    position: relative;
    overflow: hidden;
}

.room-card:hover {
    transform: translateY(-4px);
    box-shadow: 0 8px 25px rgba(0, 0, 0, 0.1);
    border-color: var(--primary-color);
}

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

.room-header {
    display: flex;
    justify-content: space-between;
    align-items: flex-start;
    margin-bottom: 1rem;
}

.room-info h3 {
    color: var(--text-primary);
    font-size: 1.1rem;
    font-weight: 600;
    margin-bottom: 0.5rem;
}

.room-info .room-code {
    color: var(--text-secondary);
    font-size: 0.9rem;
    font-family: 'Courier New', monospace;
    background: var(--hover-color);
    padding: 0.25rem 0.5rem;
    border-radius: 4px;
    display: inline-block;
}

.room-status {
    display: flex;
    align-items: center;
    gap: 0.5rem;
    font-size: 0.8rem;
    font-weight: 500;
    padding: 0.25rem 0.75rem;
    border-radius: 20px;
}

.room-status.active {
    background: rgba(34, 197, 94, 0.1);
    color: #22c55e;
}

.room-status.inactive {
    background: rgba(239, 68, 68, 0.1);
    color: #ef4444;
}

.room-status.waiting {
    background: rgba(251, 191, 36, 0.1);
    color: #fbbf24;
}

.room-details {
    margin-bottom: 1.5rem;
}

.room-detail {
    display: flex;
    align-items: center;
    gap: 0.5rem;
    margin-bottom: 0.5rem;
    color: var(--text-secondary);
    font-size: 0.9rem;
}

.room-detail i {
    width: 16px;
    color: var(--primary-color);
}

.room-actions {
    display: flex;
    gap: 0.75rem;
    flex-wrap: wrap;
}

.room-btn {
    flex: 1;
    min-width: 100px;
    padding: 0.75rem 1rem;
    border: none;
    border-radius: 8px;
    font-size: 0.9rem;
    font-weight: 500;
    cursor: pointer;
    transition: all 0.3s ease;
    display: flex;
    align-items: center;
    justify-content: center;
    gap: 0.5rem;
}

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

.room-btn.primary:hover {
    background: var(--primary-hover);
    transform: translateY(-2px);
}

.room-btn.secondary {
    background: var(--hover-color);
    color: var(--text-primary);
    border: 2px solid var(--border-color);
}

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

.room-btn.danger {
    background: rgba(239, 68, 68, 0.1);
    color: #ef4444;
    border: 2px solid rgba(239, 68, 68, 0.2);
}

.room-btn.danger:hover {
    background: #ef4444;
    color: white;
    border-color: #ef4444;
}

.class-room-card {
    background: linear-gradient(135deg, var(--primary-color), var(--secondary-color));
    color: white;
    border: none;
}

.class-room-card .room-info h3,
.class-room-card .room-detail {
    color: white;
}

.class-room-card .room-code {
    background: rgba(255, 255, 255, 0.2);
    color: white;
}

.class-room-card .room-detail i {
    color: rgba(255, 255, 255, 0.8);
}

.class-room-card::before {
    background: rgba(255, 255, 255, 0.3);
}

.room-modal {
    position: fixed;
    top: 0;
    left: 0;
    right: 0;
    bottom: 0;
    background: rgba(0, 0, 0, 0.8);
    backdrop-filter: blur(5px);
    display: flex;
    align-items: center;
    justify-content: center;
    z-index: 1000;
        opacity: 0;
    visibility: hidden;
    transition: all 0.3s ease;
    }

.room-modal.active {
        opacity: 1;
    visibility: visible;
}

.room-modal-content {
    background: var(--card-background);
    border: 2px solid var(--border-color);
    border-radius: 16px;
    padding: 2rem;
    width: 90%;
    max-width: 500px;
    max-height: 90vh;
    overflow-y: auto;
    transform: scale(0.9);
    transition: transform 0.3s ease;
    box-shadow: 0 20px 40px rgba(0, 0, 0, 0.3);
}

.room-modal.active .room-modal-content {
    transform: scale(1);
}

.room-modal-header {
    display: flex;
    justify-content: space-between;
    align-items: center;
    margin-bottom: 1.5rem;
}

.room-modal-header h3 {
    color: var(--text-primary);
    font-size: 1.3rem;
    font-weight: 600;
}

.room-modal-close {
    background: none;
    border: none;
    font-size: 1.5rem;
    color: var(--text-secondary);
    cursor: pointer;
    padding: 0.5rem;
    border-radius: 50%;
    transition: all 0.3s ease;
}

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

.room-form {
    display: flex;
        flex-direction: column;
    gap: 1rem;
    }

.form-group {
    display: flex;
        flex-direction: column;
        gap: 0.5rem;
    }

.form-group label {
    color: var(--text-primary);
    font-weight: 500;
    font-size: 0.9rem;
}

.form-group input,
.form-group textarea,
.form-group select {
    padding: 0.75rem;
    border: 2px solid var(--border-color);
    border-radius: 8px;
    background: var(--background);
    color: var(--text-primary);
    font-size: 0.9rem;
    transition: border-color 0.3s ease;
}

.form-group input:focus,
.form-group textarea:focus,
.form-group select:focus {
    outline: none;
    border-color: var(--primary-color);
}

.form-group textarea {
    resize: vertical;
    min-height: 80px;
}

.form-actions {
    display: flex;
    gap: 1rem;
    justify-content: flex-end;
    margin-top: 1rem;
}

.form-actions .btn {
    padding: 0.75rem 1.5rem;
    border: none;
    border-radius: 8px;
    font-size: 0.9rem;
    font-weight: 500;
    cursor: pointer;
    transition: all 0.3s ease;
}

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

.form-actions .btn.primary:hover {
    background: var(--primary-hover);
}

.form-actions .btn.secondary {
    background: var(--hover-color);
    color: var(--text-primary);
    border: 2px solid var(--border-color);
}

.form-actions .btn.secondary:hover {
    background: var(--border-color);
}

.sidebar-tab-content {
    display: none;
}

.sidebar-tab-content.active {
    display: block;
}

@media (max-width: 768px) {
    .public-rooms-header {
        flex-direction: column;
        gap: 1rem;
    }

    .header-actions {
        width: 100%;
        justify-content: center;
    }

    .search-filter {
        width: 100%;
        justify-content: center;
    }

    .search-box input {
        width: 200px;
    }

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

    .room-actions {
        flex-direction: column;
    }

    .room-btn {
        min-width: auto;
    }

    .room-modal-content {
        width: 95%;
        padding: 1.5rem;
    }
    }

@media (max-width: 480px) {
    .rooms-tabs {
        flex-direction: column;
        gap: 0;
    }

    .tab-btn {
        justify-content: center;
        padding: 1rem;
        border-bottom: 2px solid var(--border-color);
        border-radius: 0;
    }

    .tab-btn.active {
        border-bottom-color: var(--primary-color);
    }

    .header-actions {
        flex-direction: column;
    }

    .search-filter {
        flex-direction: column;
    }

    .search-box input {
        width: 100%;
    }
}

.modal-overlay {
    position: fixed;
    top: 0;
    left: 0;
    right: 0;
    bottom: 0;
    background: rgba(0, 0, 0, 0.5);
    display: flex;
    align-items: center;
    justify-content: center;
    z-index: 1000;
    opacity: 0;
    visibility: hidden;
    transition: all var(--transition-normal);
}

.modal-overlay.active {
    opacity: 1;
    visibility: visible;
}

.modal-content {
    background: var(--bg-primary);
    border-radius: var(--border-radius-lg);
    width: 90%;
    max-width: 600px;
    max-height: 90vh;
    overflow-y: auto;
    box-shadow: var(--shadow-heavy);
    transform: scale(0.9);
    transition: transform var(--transition-normal);
}

.modal-overlay.active .modal-content {
    transform: scale(1);
}

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

.modal-header h2 {
    color: var(--text-primary);
    font-size: var(--text-xl);
    font-weight: 600;
    margin: 0;
}

.modal-close {
    background: none;
    border: none;
    font-size: var(--text-lg);
    color: var(--text-secondary);
    cursor: pointer;
    padding: var(--spacing-sm);
    border-radius: var(--border-radius);
    transition: all var(--transition-fast);
}

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

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

.assignment-upload-info {
    background: var(--bg-secondary);
    border-radius: var(--border-radius);
    padding: var(--spacing-lg);
    margin-bottom: var(--spacing-lg);
}

.assignment-title {
    font-size: var(--text-lg);
    font-weight: 600;
    color: var(--text-primary);
    margin-bottom: var(--spacing-sm);
}

.assignment-description {
    color: var(--text-secondary);
    margin-bottom: var(--spacing-md);
    line-height: 1.5;
}

.assignment-deadline {
    display: flex;
    align-items: center;
    gap: var(--spacing-sm);
    color: var(--warning-color);
    font-weight: 500;
}

.assignment-deadline i {
    font-size: var(--text-sm);
}

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

.upload-area {
    border: 2px dashed var(--border-color);
    border-radius: var(--border-radius);
    padding: var(--spacing-2xl);
    text-align: center;
    cursor: pointer;
    transition: all var(--transition-fast);
    position: relative;
}

.upload-area:hover {
    border-color: var(--primary-color);
    background: var(--bg-secondary);
}

.upload-area.dragover {
    border-color: var(--primary-color);
    background: var(--primary-light);
    background-opacity: 0.1;
}

.upload-icon {
    font-size: 3rem;
    color: var(--text-muted);
    margin-bottom: var(--spacing-md);
}

.upload-text p {
    color: var(--text-secondary);
    margin: 0;
}

.upload-text p:first-child {
    font-size: var(--text-lg);
    margin-bottom: var(--spacing-sm);
}

.upload-link {
    color: var(--primary-color);
    text-decoration: underline;
    cursor: pointer;
}

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

.upload-hint {
    font-size: var(--text-sm);
    color: var(--text-muted);
}

.uploaded-files {
    margin-top: var(--spacing-lg);
}

.uploaded-files h4 {
    color: var(--text-primary);
    font-size: var(--text-base);
    margin-bottom: var(--spacing-md);
}

.files-list {
    display: flex;
    flex-direction: column;
    gap: var(--spacing-sm);
}

.file-item {
    display: flex;
    align-items: center;
    justify-content: space-between;
    padding: var(--spacing-md);
    background: var(--bg-secondary);
    border-radius: var(--border-radius);
    border: 1px solid var(--border-color);
}

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

.file-icon {
    font-size: var(--text-lg);
    color: var(--primary-color);
}

.file-details {
    flex: 1;
}

.file-name {
    font-weight: 500;
    color: var(--text-primary);
    margin-bottom: var(--spacing-xs);
}

.file-size {
    font-size: var(--text-sm);
    color: var(--text-secondary);
}

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

.file-remove:hover {
    background: rgba(239, 68, 68, 0.1);
}

.upload-notes {
    margin-bottom: var(--spacing-lg);
}

.upload-notes label {
    display: block;
    font-weight: 500;
    color: var(--text-primary);
    margin-bottom: var(--spacing-sm);
}

.upload-notes textarea {
    width: 100%;
    min-height: 100px;
    padding: var(--spacing-md);
    border: 1px solid var(--border-color);
    border-radius: var(--border-radius);
    font-family: inherit;
    font-size: var(--text-base);
    color: var(--text-primary);
    background: var(--bg-primary);
    resize: vertical;
    transition: all var(--transition-fast);
}

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

.upload-notes textarea::placeholder {
    color: var(--text-muted);
}

.modal-footer {
    display: flex;
    justify-content: flex-end;
    gap: var(--spacing-md);
    padding: var(--spacing-lg);
    border-top: 1px solid var(--border-color);
}

.btn {
    padding: var(--spacing-sm) var(--spacing-lg);
    border-radius: var(--border-radius);
    font-size: var(--text-base);
    font-weight: 500;
    cursor: pointer;
    transition: all var(--transition-fast);
    display: inline-flex;
    align-items: center;
    gap: var(--spacing-sm);
    border: none;
    text-decoration: none;
}

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

.btn-primary:hover {
    background: var(--primary-dark);
    transform: translateY(-1px);
}

.btn-primary:disabled {
    background: var(--text-muted);
    cursor: not-allowed;
    transform: none;
}

.btn-secondary {
    background: var(--bg-tertiary);
    color: var(--text-primary);
    border: 1px solid var(--border-color);
}

.btn-secondary:hover {
    background: var(--bg-secondary);
    border-color: var(--text-secondary);
}

.upload-progress {
    margin-top: var(--spacing-md);
}

.progress-bar {
    width: 100%;
    height: 8px;
    background: var(--bg-tertiary);
    border-radius: 4px;
    overflow: hidden;
}

.progress-fill {
    height: 100%;
    background: var(--primary-color);
    transition: width var(--transition-normal);
}

.progress-text {
    display: flex;
    justify-content: space-between;
    align-items: center;
    margin-bottom: var(--spacing-sm);
    font-size: var(--text-sm);
    color: var(--text-secondary);
}

@media (max-width: 768px) {
    .modal-content {
        width: 95%;
        max-height: 95vh;
    }

    .modal-header,
    .modal-body,
    .modal-footer {
        padding: var(--spacing-md);
    }

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

    .upload-icon {
        font-size: 2rem;
    }

    .modal-footer {
        flex-direction: column;
    }

    .btn {
        width: 100%;
        justify-content: center;
    }
}

[data-theme="dark"] .modal-overlay {
    background: rgba(0, 0, 0, 0.7);
}

[data-theme="dark"] .upload-area:hover {
    background: rgba(59, 130, 246, 0.1);
}

[data-theme="dark"] .upload-area.dragover {
    background: rgba(59, 130, 246, 0.2);
}

.assignment-item.submitted {
    border-left: 4px solid var(--success-color);
    background: rgba(16, 185, 129, 0.05);
}

.assignment-item.submitted .assignment-status {
    background: var(--success-color);
    color: white;
}

.assignment-item.submitted .assignment-status::before {
    content: "✓ ";
}

.submission-status {
    display: inline-flex;
    align-items: center;
    gap: var(--spacing-xs);
    padding: var(--spacing-xs) var(--spacing-sm);
    border-radius: var(--border-radius);
    font-size: var(--text-sm);
    font-weight: 500;
}

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

.submission-status.graded {
    background: rgba(59, 130, 246, 0.1);
    color: var(--primary-color);
}

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

.recent-grades-section {
    margin-top: 30px;
    background: var(--surface-color);
    border-radius: 12px;
    padding: 20px;
    border: 1px solid var(--border-color);
}

.recent-grades-section h3 {
    color: var(--text-color);
    margin-bottom: 20px;
    font-size: 18px;
    font-weight: 600;
    display: flex;
    align-items: center;
    gap: 10px;
}

.recent-grades-section h3::before {
    content: '';
    width: 4px;
    height: 20px;
    background: linear-gradient(135deg, var(--primary-color), var(--secondary-color));
    border-radius: 2px;
}

.recent-grades-list {
    display: grid;
    gap: 16px;
}

.recent-grade-item {
    background: var(--bg-color);
    border: 1px solid var(--border-color);
    border-radius: 8px;
    padding: 16px;
    display: flex;
    align-items: center;
    gap: 16px;
    transition: all 0.2s ease;
}

.recent-grade-item:hover {
    background: var(--hover-color);
    transform: translateY(-2px);
    box-shadow: 0 4px 12px rgba(0, 0, 0, 0.1);
}

.recent-grade-value {
    font-size: 24px;
    font-weight: 700;
    padding: 8px 12px;
    border-radius: 8px;
    color: white;
    min-width: 60px;
    text-align: center;
    flex-shrink: 0;
}

.recent-grade-value.excellent {
    background: linear-gradient(135deg, #10b981, #059669);
}

.recent-grade-value.good {
    background: linear-gradient(135deg, #3b82f6, #2563eb);
}

.recent-grade-value.average {
    background: linear-gradient(135deg, #f59e0b, #d97706);
}

.recent-grade-value.poor {
    background: linear-gradient(135deg, #ef4444, #dc2626);
}

.recent-grade-info {
    flex: 1;
}

.recent-grade-subject {
    font-size: 16px;
    font-weight: 600;
    color: var(--text-color);
    margin-bottom: 4px;
}

.recent-grade-type {
    font-size: 14px;
    color: var(--text-secondary);
    margin-bottom: 8px;
    padding: 2px 8px;
    background: var(--hover-color);
    border-radius: 12px;
    display: inline-block;
    text-transform: uppercase;
    font-weight: 500;
}

.recent-grade-date {
    font-size: 12px;
    color: var(--text-secondary);
    display: flex;
    align-items: center;
    gap: 4px;
}

.recent-grade-feedback {
    margin-top: 8px;
    font-size: 14px;
    color: var(--text-secondary);
    font-style: italic;
}

.grade-notification {
    background: linear-gradient(135deg, #10b981, #059669);
    color: white;
    padding: 12px 16px;
    border-radius: 8px;
    margin-bottom: 20px;
    display: flex;
    align-items: center;
    gap: 12px;
    animation: slideInDown 0.3s ease;
}

.grade-notification i {
    font-size: 20px;
}

.grade-notification-content {
    flex: 1;
}

.grade-notification-title {
    font-weight: 600;
    margin-bottom: 4px;
}

.grade-notification-message {
    font-size: 14px;
    opacity: 0.9;
}

.grade-notification-close {
    background: none;
    border: none;
    color: white;
    cursor: pointer;
    padding: 4px;
    border-radius: 4px;
    opacity: 0.8;
    transition: opacity 0.2s ease;
}

.grade-notification-close:hover {
    opacity: 1;
}

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

.grade-item {
    background: var(--surface-color);
    border: 1px solid var(--border-color);
    border-radius: 12px;
    padding: 20px;
    margin-bottom: 16px;
    transition: all 0.3s ease;
    position: relative;
    overflow: hidden;
}

.grade-item::before {
    content: '';
    position: absolute;
    top: 0;
    left: 0;
    right: 0;
    height: 4px;
    background: linear-gradient(90deg, var(--primary-color), var(--secondary-color));
    transform: scaleX(0);
    transition: transform 0.3s ease;
}

.grade-item:hover::before {
    transform: scaleX(1);
}

.grade-item:hover {
    background: var(--hover-color);
    transform: translateY(-2px);
    box-shadow: 0 8px 25px rgba(0, 0, 0, 0.15);
}

.grade-header {
    display: flex;
    justify-content: space-between;
    align-items: flex-start;
    margin-bottom: 16px;
}

.grade-info h3 {
    color: var(--text-color);
    margin-bottom: 8px;
    font-size: 18px;
    font-weight: 600;
}

.grade-type {
    display: inline-block;
    padding: 4px 12px;
    border-radius: 20px;
    font-size: 12px;
    font-weight: 500;
    text-transform: uppercase;
    letter-spacing: 0.5px;
}

.grade-type.tema {
    background: linear-gradient(135deg, #10b981, #059669);
    color: white;
}

.grade-type.test {
    background: linear-gradient(135deg, #3b82f6, #2563eb);
    color: white;
}

.grade-type.teza {
    background: linear-gradient(135deg, #8b5cf6, #7c3aed);
    color: white;
}

.grade-type.activitate {
    background: linear-gradient(135deg, #f59e0b, #d97706);
    color: white;
}

.grade-type.proiect {
    background: linear-gradient(135deg, #ef4444, #dc2626);
    color: white;
}

.grade-value {
    font-size: 32px;
    font-weight: 700;
    padding: 12px 20px;
    border-radius: 12px;
    color: white;
    text-align: center;
    min-width: 80px;
    box-shadow: 0 4px 12px rgba(0, 0, 0, 0.2);
}

.grade-meta {
    display: flex;
    flex-wrap: wrap;
    gap: 16px;
    margin-bottom: 16px;
    color: var(--text-secondary);
    font-size: 14px;
}

.grade-meta > div {
    display: flex;
    align-items: center;
    gap: 6px;
}

.grade-feedback {
    background: var(--bg-color);
    border: 1px solid var(--border-color);
    border-radius: 8px;
    padding: 12px;
    margin-top: 12px;
}

.grade-feedback h4 {
    color: var(--text-color);
    margin-bottom: 8px;
    font-size: 14px;
    font-weight: 600;
}

.grade-feedback p {
    color: var(--text-secondary);
    font-size: 14px;
    line-height: 1.5;
    margin: 0;
}

.grades-filters {
    background: var(--surface-color);
    border: 1px solid var(--border-color);
    border-radius: 12px;
    padding: 20px;
    margin-bottom: 24px;
    display: flex;
    flex-wrap: wrap;
    gap: 16px;
    align-items: center;
}

.grades-filters .filter-group {
    display: flex;
    flex-direction: column;
    gap: 6px;
}

.grades-filters .filter-group label {
    font-size: 12px;
    font-weight: 500;
    color: var(--text-secondary);
    text-transform: uppercase;
    letter-spacing: 0.5px;
}

.grades-filters .filter-select {
    padding: 8px 12px;
    border: 1px solid var(--border-color);
    border-radius: 6px;
    background: var(--bg-color);
    color: var(--text-color);
    font-size: 14px;
    min-width: 140px;
    transition: all 0.2s ease;
}

.grades-filters .filter-select:focus {
    outline: none;
    border-color: var(--primary-color);
    box-shadow: 0 0 0 2px rgba(99, 102, 241, 0.1);
}

.filter-actions {
    margin-left: auto;
}

.filter-actions .action-btn {
    padding: 8px 12px;
    border: 1px solid var(--border-color);
    border-radius: 6px;
    background: var(--bg-color);
    color: var(--text-color);
    cursor: pointer;
    transition: all 0.2s ease;
}

.filter-actions .action-btn:hover {
    background: var(--hover-color);
    transform: translateY(-1px);
}

.grades-chart-container {
    background: var(--surface-color);
    border: 1px solid var(--border-color);
    border-radius: 12px;
    padding: 24px;
    margin-bottom: 24px;
}

.chart-header {
    display: flex;
    justify-content: space-between;
    align-items: center;
    margin-bottom: 20px;
    flex-wrap: wrap;
    gap: 16px;
}

.chart-legend {
    display: flex;
    flex-wrap: wrap;
    gap: 16px;
}

.legend-item {
    display: flex;
    align-items: center;
    gap: 8px;
    font-size: 12px;
    color: var(--text-secondary);
}

.legend-color {
    width: 12px;
    height: 12px;
    border-radius: 2px;
}

@media (max-width: 768px) {
    .recent-grades-section {
        padding: 16px;
    }

    .recent-grade-item {
        flex-direction: column;
        align-items: flex-start;
        gap: 12px;
    }

    .recent-grade-value {
        align-self: flex-start;
        min-width: 50px;
        font-size: 20px;
    }

    .grade-header {
        flex-direction: column;
        align-items: flex-start;
        gap: 12px;
    }

    .grade-value {
        font-size: 24px;
        min-width: 60px;
        padding: 8px 16px;
    }

    .grade-meta {
        flex-direction: column;
        gap: 8px;
    }

    .grades-filters {
        flex-direction: column;
        align-items: stretch;
    }

    .filter-actions {
        margin-left: 0;
        align-self: center;
    }

    .chart-header {
        flex-direction: column;
        align-items: flex-start;
    }

    .chart-legend {
        justify-content: center;
    }
}

@media (max-width: 480px) {
    .recent-grades-section h3 {
        font-size: 16px;
    }

    .recent-grade-subject {
        font-size: 14px;
    }

    .grade-info h3 {
        font-size: 16px;
    }

    .grade-value {
        font-size: 20px;
        min-width: 50px;
        padding: 6px 12px;
    }

    .grades-filters .filter-select {
        min-width: 120px;
    }

    .legend-item {
        font-size: 11px;
    }
}

[data-theme="dark"] .recent-grade-item:hover {
    background: rgba(255, 255, 255, 0.05);
}

[data-theme="dark"] .grade-item:hover {
    background: rgba(255, 255, 255, 0.05);
}

[data-theme="dark"] .grade-notification {
    background: var(--card-bg);
    border-color: var(--border-color);
}

.lesson-viewer-content {
    max-width: 100%;
    padding: 2rem;
    background: white;
    color: #333;
    font-family: 'Segoe UI', Tahoma, Geneva, Verdana, sans-serif;
    line-height: 1.8;
    border-radius: 8px;
    max-height: 70vh;
    overflow-y: auto;
}

.lesson-viewer-content h1 {
    color: #2c3e50;
    border-bottom: 3px solid #3498db;
    padding-bottom: 0.5rem;
    margin-bottom: 1.5rem;
}

.lesson-viewer-content h2 {
    color: #34495e;
    margin-top: 2rem;
    margin-bottom: 1rem;
    padding-left: 1rem;
    border-left: 4px solid #3498db;
}

.lesson-viewer-content h3 {
    color: #2c3e50;
    margin-top: 1.5rem;
    margin-bottom: 0.75rem;
}

.lesson-viewer-content p {
    margin-bottom: 1rem;
    text-align: justify;
}

.lesson-viewer-content code {
    background: #f8f9fa;
    padding: 0.2rem 0.4rem;
    border-radius: 4px;
    font-family: 'Courier New', monospace;
    color: #e74c3c;
    border: 1px solid #e9ecef;
}

.lesson-viewer-content pre {
    background: #2c3e50;
    color: #ecf0f1;
    padding: 1.5rem;
    border-radius: 8px;
    overflow-x: auto;
    margin: 1.5rem 0;
    border-left: 4px solid #3498db;
}

.lesson-viewer-content pre code {
    background: none;
    border: none;
    color: inherit;
    padding: 0;
}

.lesson-viewer-content ul,
.lesson-viewer-content ol {
    margin: 1rem 0;
    padding-left: 2rem;
}

.lesson-viewer-content li {
    margin-bottom: 0.5rem;
}

.lesson-viewer-content blockquote {
    border-left: 4px solid #3498db;
    padding-left: 1rem;
    margin: 1.5rem 0;
    background: #f8f9fa;
    padding: 1rem;
    border-radius: 4px;
    font-style: italic;
}

.lesson-viewer-content .note {
    background: #e8f4fd;
    border: 1px solid #3498db;
    border-radius: 8px;
    padding: 1rem;
    margin: 1.5rem 0;
    position: relative;
}

.lesson-viewer-content .note::before {
    content: '📝';
    position: absolute;
    top: 1rem;
    left: 1rem;
    font-size: 1.2rem;
}

.lesson-viewer-content .note-content {
    margin-left: 2rem;
}

.lesson-viewer-content .warning {
    background: #fff3cd;
    border: 1px solid #ffc107;
    border-radius: 8px;
    padding: 1rem;
    margin: 1.5rem 0;
    position: relative;
}

.lesson-viewer-content .warning::before {
    content: '⚠️';
    position: absolute;
    top: 1rem;
    left: 1rem;
    font-size: 1.2rem;
}

.lesson-viewer-content .warning-content {
    margin-left: 2rem;
}

.lesson-viewer-content .tip {
    background: #d4edda;
    border: 1px solid #28a745;
    border-radius: 8px;
    padding: 1rem;
    margin: 1.5rem 0;
    position: relative;
}

.lesson-viewer-content .tip::before {
    content: '💡';
    position: absolute;
    top: 1rem;
    left: 1rem;
    font-size: 1.2rem;
}

.lesson-viewer-content .tip-content {
    margin-left: 2rem;
}

.lesson-viewer-content .exercise {
    background: #f8f9fa;
    border: 2px solid #6c757d;
    border-radius: 8px;
    padding: 1.5rem;
    margin: 2rem 0;
}

.lesson-viewer-content .exercise-title {
    color: #495057;
    font-weight: 600;
    margin-bottom: 1rem;
    display: flex;
    align-items: center;
    gap: 0.5rem;
}

.lesson-viewer-content .exercise-title::before {
    content: '📝';
    font-size: 1.2rem;
}

.lesson-viewer-content img {
    max-width: 100%;
    height: auto;
    border-radius: 8px;
    margin: 1rem 0;
}

.lesson-viewer-content video {
    max-width: 100%;
    height: auto;
    border-radius: 8px;
    margin: 1rem 0;
}

.lesson-viewer-content table {
    width: 100%;
    border-collapse: collapse;
    margin: 1.5rem 0;
    background: white;
    border-radius: 8px;
    overflow: hidden;
    box-shadow: 0 2px 4px rgba(0, 0, 0, 0.1);
}

.lesson-viewer-content th,
.lesson-viewer-content td {
    padding: 1rem;
    text-align: left;
    border-bottom: 1px solid #e9ecef;
}

.lesson-viewer-content th {
    background: #f8f9fa;
    font-weight: 600;
    color: #495057;
}

.lesson-viewer-content tr:hover {
    background: #f8f9fa;
}

[data-theme="dark"] .lesson-viewer-content {
    background: var(--card-bg);
    color: var(--text-primary);
}

[data-theme="dark"] .lesson-viewer-content h1,
[data-theme="dark"] .lesson-viewer-content h2,
[data-theme="dark"] .lesson-viewer-content h3 {
    color: var(--text-primary);
}

[data-theme="dark"] .lesson-viewer-content pre {
    background: var(--bg-secondary);
    color: var(--text-primary);
}

[data-theme="dark"] .lesson-viewer-content code {
    background: var(--bg-secondary);
    color: var(--primary-color);
}

[data-theme="dark"] .lesson-viewer-content blockquote {
    background: var(--bg-secondary);
}

[data-theme="dark"] .lesson-viewer-content .note {
    background: var(--primary-bg);
    border-color: var(--primary-color);
}

[data-theme="dark"] .lesson-viewer-content .warning {
    background: var(--warning-bg);
    border-color: var(--warning-color);
}

[data-theme="dark"] .lesson-viewer-content .tip {
    background: var(--success-bg);
    border-color: var(--success-color);
}

[data-theme="dark"] .lesson-viewer-content .exercise {
    background: var(--bg-secondary);
    border-color: var(--border-color);
}

[data-theme="dark"] .lesson-viewer-content table {
    background: var(--card-bg);
}

[data-theme="dark"] .lesson-viewer-content th {
    background: var(--bg-secondary);
    color: var(--text-primary);
}

[data-theme="dark"] .lesson-viewer-content td {
    border-bottom-color: var(--border-color);
}

[data-theme="dark"] .lesson-viewer-content tr:hover {
    background: var(--bg-secondary);
}

.modal-container.extra-large {
    max-width: 1200px;
    max-height: 90vh;
}

.modal-container.extra-large .modal-body {
    max-height: calc(90vh - 120px);
    overflow-y: auto;
}

/* Stiluri pentru secțiunea Cursuri */
.courses-container {
    padding: 2rem 0;
}

.courses-grid {
    display: grid;
    grid-template-columns: repeat(auto-fit, minmax(350px, 1fr));
    gap: 2rem;
}

.course-category {
    background: var(--card-bg);
    border-radius: var(--border-radius-lg);
    padding: 1.5rem;
    border: 1px solid var(--border-color);
    transition: var(--transition-smooth);
}

.course-category:hover {
    transform: translateY(-2px);
    box-shadow: var(--shadow-lg);
}

.category-header {
    text-align: center;
    margin-bottom: 1.5rem;
    padding-bottom: 1rem;
    border-bottom: 1px solid var(--border-color);
}

.category-icon {
    width: 60px;
    height: 60px;
    background: linear-gradient(135deg, var(--primary-color), var(--accent-color));
    border-radius: 50%;
    display: flex;
    align-items: center;
    justify-content: center;
    margin: 0 auto 1rem;
    font-size: 1.5rem;
    color: white;
}

.category-header h3 {
    color: var(--text-primary);
    margin-bottom: 0.5rem;
}

.category-header p {
    color: var(--text-secondary);
    font-size: 0.9rem;
}

.course-list {
    display: flex;
    flex-direction: column;
    gap: 0.75rem;
}

.course-item {
    display: flex;
    justify-content: space-between;
    align-items: center;
    padding: 1rem;
    background: var(--bg-secondary);
    border-radius: var(--border-radius);
    border: 1px solid var(--border-color);
    transition: var(--transition-smooth);
}

.course-item:hover {
    background: var(--hover-bg);
    border-color: var(--primary-color);
}

.course-title {
    font-weight: 500;
    color: var(--text-primary);
    flex: 1;
}

/* Stiluri pentru secțiunea Teste */
.tests-container {
    padding: 2rem 0;
}

.tests-grid {
    display: grid;
    grid-template-columns: repeat(auto-fit, minmax(350px, 1fr));
    gap: 2rem;
}

.test-category {
    background: var(--card-bg);
    border-radius: var(--border-radius-lg);
    padding: 1.5rem;
    border: 1px solid var(--border-color);
    transition: var(--transition-smooth);
}

.test-category:hover {
    transform: translateY(-2px);
    box-shadow: var(--shadow-lg);
}

.test-list {
    display: flex;
    flex-direction: column;
    gap: 0.75rem;
}

.test-item {
    display: flex;
    justify-content: space-between;
    align-items: center;
    padding: 1rem;
    background: var(--bg-secondary);
    border-radius: var(--border-radius);
    border: 1px solid var(--border-color);
    transition: var(--transition-smooth);
}

.test-item:hover {
    background: var(--hover-bg);
    border-color: var(--primary-color);
}

.test-title {
    font-weight: 500;
    color: var(--text-primary);
    flex: 1;
}

.btn-sm {
    padding: 0.5rem 1rem;
    font-size: 0.875rem;
}

/* Online Lessons Styles */
.online-lessons-container {
    background: white;
    border-radius: 12px;
    padding: 24px;
    box-shadow: 0 2px 10px rgba(0,0,0,0.1);
}

.lesson-tabs {
    display: flex;
    gap: 8px;
    margin-bottom: 24px;
    border-bottom: 1px solid #e5e7eb;
}

.tab-btn {
    padding: 12px 24px;
    border: none;
    background: transparent;
    color: #6b7280;
    font-weight: 500;
    border-radius: 8px 8px 0 0;
    cursor: pointer;
    transition: all 0.3s ease;
}

.tab-btn.active {
    background: #3b82f6;
    color: white;
}

.tab-content {
    display: none;
}

.tab-content.active {
    display: block;
}

.lesson-header {
    display: flex;
    justify-content: space-between;
    align-items: center;
    margin-bottom: 24px;
}

.private-lesson-info .info-card {
    display: flex;
    gap: 16px;
    padding: 20px;
    background: #f8fafc;
    border-radius: 12px;
    border: 1px solid #e5e7eb;
}

.info-icon {
    width: 48px;
    height: 48px;
    background: #3b82f6;
    border-radius: 12px;
    display: flex;
    align-items: center;
    justify-content: center;
    color: white;
    font-size: 20px;
}

.info-content h4 {
    margin: 0 0 8px 0;
    color: #1f2937;
}

.info-content p {
    margin: 0 0 12px 0;
    color: #6b7280;
}

.room-id {
    display: flex;
    align-items: center;
    gap: 8px;
    font-size: 14px;
}

.room-id code {
    background: #e5e7eb;
    padding: 4px 8px;
    border-radius: 4px;
    font-family: 'Courier New', monospace;
}

.copy-btn {
    background: none;
    border: none;
    color: #6b7280;
    cursor: pointer;
    padding: 4px;
    border-radius: 4px;
    transition: color 0.3s ease;
}

.copy-btn:hover {
    color: #3b82f6;
}

.room-actions {
    display: flex;
    gap: 16px;
    align-items: center;
    margin-bottom: 24px;
    flex-wrap: wrap;
}

.join-room-form {
    display: flex;
    gap: 8px;
    align-items: center;
}

.join-room-form input {
    padding: 8px 12px;
    border: 1px solid #d1d5db;
    border-radius: 6px;
    width: 200px;
}

.rooms-grid {
    display: grid;
    grid-template-columns: repeat(auto-fill, minmax(300px, 1fr));
    gap: 16px;
    margin-bottom: 24px;
}

.room-card {
    background: white;
    border: 1px solid #e5e7eb;
    border-radius: 12px;
    padding: 16px;
    transition: all 0.3s ease;
}

.room-card:hover {
    box-shadow: 0 4px 12px rgba(0,0,0,0.1);
    transform: translateY(-2px);
}

.room-card-header {
    display: flex;
    justify-content: space-between;
    align-items: flex-start;
    margin-bottom: 12px;
}

.room-name {
    font-weight: 600;
    color: #1f2937;
    margin: 0;
}

.room-status {
    padding: 4px 8px;
    border-radius: 12px;
    font-size: 12px;
    font-weight: 500;
}

.room-status.active {
    background: #dcfce7;
    color: #166534;
}

.room-info {
    color: #6b7280;
    font-size: 14px;
    margin-bottom: 12px;
}

.room-actions-card {
    display: flex;
    gap: 8px;
}

.btn-sm {
    padding: 6px 12px;
    font-size: 14px;
}

/* Modal overlay îmbunătățit */
.modal {
    position: fixed;
    top: 0;
    left: 0;
    width: 100%;
    height: 100%;
    background: rgba(0, 0, 0, 0.8);
    display: none;
    align-items: center;
    justify-content: center;
    z-index: 10000;
    backdrop-filter: blur(4px);
}

.modal-open {
    overflow: hidden;
}

/* Video Chat Modal Styles - Google Meet Design */
.video-chat-content {
    width: 95vw;
    height: 90vh;
    max-width: none;
    max-height: none;
    padding: 0;
    display: flex;
    flex-direction: column;
    background: #202124;
    border-radius: 12px;
    overflow: hidden;
    box-shadow: 0 8px 32px rgba(0,0,0,0.4);
    border: 1px solid #3c4043;
}

.video-chat-header {
    display: flex;
    justify-content: space-between;
    align-items: center;
    padding: 16px 24px;
    background: #202124;
    color: white;
    border-bottom: 1px solid #3c4043;
    min-height: 64px;
}

.room-info h3 {
    margin: 0;
    font-size: 18px;
    font-weight: 500;
    color: #e8eaed;
    font-family: 'Google Sans', 'Roboto', sans-serif;
}

.room-code {
    font-size: 13px;
    color: #9aa0a6;
    font-family: 'Roboto Mono', monospace;
    margin-top: 2px;
}

.chat-controls {
    display: flex;
    gap: 12px;
    align-items: center;
}

.control-btn {
    width: 48px;
    height: 48px;
    border: none;
    border-radius: 50%;
    background: #3c4043;
    color: #e8eaed;
    cursor: pointer;
    transition: all 0.2s cubic-bezier(0.4, 0.0, 0.2, 1);
    display: flex;
    align-items: center;
    justify-content: center;
    font-size: 18px;
    position: relative;
    box-shadow: 0 1px 3px rgba(0,0,0,0.3);
}

.control-btn:hover {
    background: #5f6368;
    transform: scale(1.08);
    box-shadow: 0 2px 8px rgba(0,0,0,0.4);
}

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

.control-btn.active {
    background: #1a73e8;
    color: white;
}

.control-btn.muted {
    background: #ea4335;
    color: white;
}

.control-btn.danger {
    background: #ea4335;
    color: white;
}

.control-btn.danger:hover {
    background: #d33b2c;
}

.video-chat-body {
    display: flex;
    flex: 1;
    overflow: hidden;
    background: #202124;
}

.video-area {
    flex: 1;
    background: #000;
    position: relative;
    display: flex;
    flex-direction: column;
    padding: 20px;
    gap: 16px;
}

.main-video {
    flex: 1;
    position: relative;
    display: flex;
    align-items: center;
    justify-content: center;
    background: #1f1f1f;
    border-radius: 12px;
    overflow: hidden;
    box-shadow: 0 4px 20px rgba(0,0,0,0.4);
    border: 2px solid #3c4043;
}

.main-video video {
    width: 100%;
    height: 100%;
    object-fit: cover;
    border-radius: 10px;
}

.video-overlay {
    position: absolute;
    bottom: 16px;
    left: 16px;
    background: rgba(0,0,0,0.8);
    color: white;
    padding: 8px 12px;
    border-radius: 8px;
    font-size: 14px;
    font-weight: 500;
    backdrop-filter: blur(8px);
    border: 1px solid rgba(255,255,255,0.1);
}

.remote-videos {
    display: flex;
    gap: 12px;
    padding: 0;
    overflow-x: auto;
    min-height: 120px;
    scrollbar-width: thin;
    scrollbar-color: #3c4043 transparent;
}

.remote-videos::-webkit-scrollbar {
    height: 6px;
}

.remote-videos::-webkit-scrollbar-track {
    background: transparent;
}

.remote-videos::-webkit-scrollbar-thumb {
    background: #3c4043;
    border-radius: 3px;
}

.remote-video {
    width: 160px;
    height: 120px;
    background: #1f1f1f;
    border-radius: 12px;
    position: relative;
    overflow: hidden;
    flex-shrink: 0;
    box-shadow: 0 2px 8px rgba(0,0,0,0.3);
    border: 2px solid transparent;
    transition: all 0.2s cubic-bezier(0.4, 0.0, 0.2, 1);
}

.remote-video:hover {
    border-color: #1a73e8;
    transform: scale(1.02);
    box-shadow: 0 4px 12px rgba(0,0,0,0.4);
}

.remote-video video {
    width: 100%;
    height: 100%;
    object-fit: cover;
    border-radius: 10px;
}

/* Chat sidebar îmbunătățit */
.chat-sidebar {
    width: 320px;
    background: #f8f9fa;
    border-left: 1px solid #dadce0;
    display: flex;
    flex-direction: column;
}

.chat-header {
    padding: 20px;
    border-bottom: 1px solid #dadce0;
    display: flex;
    justify-content: space-between;
    align-items: center;
    background: white;
}

.chat-header h4 {
    margin: 0;
    color: #202124;
    font-size: 16px;
    font-weight: 500;
    font-family: 'Google Sans', 'Roboto', sans-serif;
}

.participants-count {
    font-size: 12px;
    color: #5f6368;
    background: #f1f3f4;
    padding: 4px 8px;
    border-radius: 12px;
    font-weight: 500;
}

.chat-messages {
    flex: 1;
    padding: 16px;
    overflow-y: auto;
    background: #f8f9fa;
    scrollbar-width: thin;
    scrollbar-color: #dadce0 transparent;
}

.chat-messages::-webkit-scrollbar {
    width: 6px;
}

.chat-messages::-webkit-scrollbar-track {
    background: transparent;
}

.chat-messages::-webkit-scrollbar-thumb {
    background: #dadce0;
    border-radius: 3px;
}

.chat-message {
    margin-bottom: 16px;
    animation: slideInMessage 0.3s cubic-bezier(0.4, 0.0, 0.2, 1);
}

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

.message-sender {
    font-weight: 500;
    font-size: 12px;
    color: #5f6368;
    margin-bottom: 4px;
    font-family: 'Google Sans', sans-serif;
}

.message-content {
    background: white;
    padding: 12px 16px;
    border-radius: 18px;
    font-size: 14px;
    line-height: 1.4;
    box-shadow: 0 1px 3px rgba(0,0,0,0.1);
    max-width: 85%;
    word-wrap: break-word;
    border: 1px solid #f1f3f4;
}

.message-content.own {
    background: #1a73e8;
    color: white;
    margin-left: auto;
    margin-right: 0;
    border: 1px solid #1a73e8;
}

.chat-input {
    padding: 16px;
    border-top: 1px solid #dadce0;
    display: flex;
    gap: 12px;
    background: white;
}

.chat-input input {
    flex: 1;
    padding: 12px 16px;
    border: 1px solid #dadce0;
    border-radius: 24px;
    outline: none;
    font-size: 14px;
    transition: all 0.2s cubic-bezier(0.4, 0.0, 0.2, 1);
    font-family: 'Roboto', sans-serif;
}

.chat-input input:focus {
    border-color: #1a73e8;
    box-shadow: 0 0 0 2px rgba(26,115,232,0.2);
}

.chat-input input::placeholder {
    color: #9aa0a6;
}

.chat-input button {
    width: 40px;
    height: 40px;
    border: none;
    background: #1a73e8;
    color: white;
    border-radius: 50%;
    cursor: pointer;
    display: flex;
    align-items: center;
    justify-content: center;
    transition: all 0.2s cubic-bezier(0.4, 0.0, 0.2, 1);
    box-shadow: 0 1px 3px rgba(0,0,0,0.2);
}

.chat-input button:hover {
    background: #1557b0;
    transform: scale(1.05);
    box-shadow: 0 2px 6px rgba(0,0,0,0.3);
}

.chat-input button:active {
    transform: scale(0.95);
}

.chat-input button:disabled {
    background: #dadce0;
    cursor: not-allowed;
    transform: none;
    box-shadow: none;
}

/* Responsive design */
@media (max-width: 768px) {
    .lesson-viewer-content {
        padding: 1rem;
    }

    .lesson-viewer-content h1 {
        font-size: 1.5rem;
    }

    .lesson-viewer-content h2 {
        font-size: 1.3rem;
    }

    .lesson-viewer-content h3 {
        font-size: 1.1rem;
    }

    .lesson-viewer-content pre {
        padding: 1rem;
        font-size: 0.9rem;
    }

    .lesson-viewer-content .note-content,
    .lesson-viewer-content .warning-content,
    .lesson-viewer-content .tip-content {
        margin-left: 1rem;
    }

    .lesson-viewer-content .exercise {
        padding: 1rem;
    }

    .lesson-viewer-content table {
        font-size: 0.9rem;
    }

    .lesson-viewer-content th,
    .lesson-viewer-content td {
        padding: 0.75rem;
    }

    .video-chat-content {
        width: 100vw;
        height: 100vh;
        border-radius: 0;
    }
    
    .video-chat-body {
        flex-direction: column;
    }
    
    .chat-sidebar {
        width: 100%;
        height: 250px;
        border-left: none;
        border-top: 1px solid #dadce0;
    }
    
    .video-area {
        padding: 12px;
    }
    
    .remote-videos {
        flex-direction: row;
        height: auto;
        max-height: 120px;
    }
    
    .remote-video {
        width: 100px;
        height: 75px;
    }
    
    .control-btn {
        width: 44px;
        height: 44px;
        font-size: 16px;
    }
    
    .room-actions {
        flex-direction: column;
        align-items: stretch;
    }
    
    .join-room-form {
        justify-content: stretch;
    }
    
    .join-room-form input {
        width: 100%;
    }
}

/* Loading și connection states */
.video-loading {
    display: flex;
    align-items: center;
    justify-content: center;
    background: #1f1f1f;
    color: #9aa0a6;
    font-size: 14px;
    font-family: 'Google Sans', sans-serif;
}

.video-loading::before {
    content: '';
    width: 20px;
    height: 20px;
    border: 2px solid #3c4043;
    border-top: 2px solid #1a73e8;
    border-radius: 50%;
    animation: spin 1s linear infinite;
    margin-right: 8px;
}

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

/* Connection status indicators */
.connection-status {
    position: absolute;
    top: 8px;
    right: 8px;
    width: 12px;
    height: 12px;
    border-radius: 50%;
    background: #34a853;
    border: 2px solid #202124;
}

.connection-status.poor {
    background: #fbbc04;
}

.connection-status.disconnected {
    background: #ea4335;
}

/* Stiluri pentru modal-ul de teste */
.test-modal {
    max-width: 800px;
    width: 90vw;
    max-height: 90vh;
    overflow-y: auto;
}

.test-selection {
    text-align: center;
    padding: 2rem;
}

.test-info h3 {
    color: var(--primary-color);
    margin-bottom: 1rem;
    font-size: 1.5rem;
}

.test-info p {
    color: var(--text-secondary);
    margin-bottom: 2rem;
    line-height: 1.6;
}

.test-buttons {
    display: flex;
    gap: 1rem;
    justify-content: center;
    flex-wrap: wrap;
}

.test-interface {
    padding: 1.5rem;
}

.test-progress {
    display: flex;
    align-items: center;
    justify-content: space-between;
    margin-bottom: 2rem;
    padding: 1rem;
    background: var(--card-bg);
    border-radius: var(--border-radius);
    border: 1px solid var(--border-color);
}

.progress-bar {
    flex: 1;
    height: 8px;
    background: var(--bg-secondary);
    border-radius: 4px;
    margin-right: 1rem;
    overflow: hidden;
}

.progress-fill {
    height: 100%;
    background: linear-gradient(90deg, var(--primary-color), var(--secondary-color));
    border-radius: 4px;
    transition: width 0.3s ease;
    width: 0%;
}

#questionCounter {
    font-weight: 600;
    color: var(--text-primary);
    white-space: nowrap;
}

.question-container {
    margin-bottom: 2rem;
}

#questionText {
    color: var(--text-primary);
    margin-bottom: 1.5rem;
    font-size: 1.2rem;
    line-height: 1.6;
}

.options-container {
    display: flex;
    flex-direction: column;
    gap: 0.75rem;
}

.option-button {
    padding: 1rem 1.5rem;
    background: var(--card-bg);
    border: 2px solid var(--border-color);
    border-radius: var(--border-radius);
    color: var(--text-primary);
    cursor: pointer;
    transition: all 0.3s ease;
    text-align: left;
    font-size: 1rem;
    line-height: 1.5;
}

.option-button:hover {
    border-color: var(--primary-color);
    background: var(--primary-color-10);
    transform: translateY(-2px);
}

.option-button.selected {
    border-color: var(--primary-color);
    background: var(--primary-color-20);
    color: var(--primary-color);
    font-weight: 600;
}

.test-navigation {
    display: flex;
    justify-content: space-between;
    padding-top: 1.5rem;
    border-top: 1px solid var(--border-color);
}

.test-results {
    text-align: center;
    padding: 2rem;
}

.results-header {
    margin-bottom: 2rem;
}

#resultIcon {
    font-size: 3rem;
    margin-bottom: 1rem;
    display: block;
}

#resultIcon.success {
    color: var(--success-color);
}

#resultIcon.warning {
    color: var(--warning-color);
}

#resultIcon.error {
    color: var(--error-color);
}

.results-header h3 {
    color: var(--text-primary);
    font-size: 1.5rem;
    margin: 0;
}

.score-display {
    font-size: 2.5rem;
    font-weight: 700;
    color: var(--primary-color);
    margin-bottom: 1rem;
}

.score-total {
    color: var(--text-secondary);
    font-size: 1.5rem;
}

#resultMessage {
    color: var(--text-secondary);
    font-size: 1.1rem;
    line-height: 1.6;
    margin-bottom: 2rem;
}

.results-actions {
    display: flex;
    gap: 1rem;
    justify-content: center;
    flex-wrap: wrap;
}

/* Responsive design pentru modal teste */
@media (max-width: 768px) {
    .test-modal {
        width: 95vw;
        margin: 1rem;
    }
    
    .test-progress {
        flex-direction: column;
        gap: 1rem;
        text-align: center;
    }
    
    .progress-bar {
        margin-right: 0;
        order: 2;
    }
    
    .test-navigation {
        flex-direction: column;
        gap: 1rem;
    }
    
    .test-buttons,
    .results-actions {
        flex-direction: column;
    }
    
    .option-button {
        padding: 0.75rem 1rem;
        font-size: 0.9rem;
    }
}

/* CodeMate Styles */
.codemate-container {
    display: flex;
    height: calc(100vh - 200px);
    background: var(--card-bg);
    border-radius: 12px;
    overflow: hidden;
    box-shadow: var(--shadow-md);
}

.chat-sidebar {
    width: 300px;
    background: var(--sidebar-bg);
    border-right: 1px solid var(--border-color);
    display: flex;
    flex-direction: column;
}

.chat-sidebar .chat-header {
    padding: 1rem;
    border-bottom: 1px solid var(--border-color);
    background: var(--header-bg);
}

.chat-sidebar .chat-header h3 {
    margin: 0 0 0.5rem 0;
    font-size: 1.1rem;
    color: var(--text-primary);
}

.conversations-list {
    flex: 1;
    overflow-y: auto;
    padding: 0.5rem;
}

.conversation-item {
    padding: 0.75rem;
    margin-bottom: 0.5rem;
    background: var(--card-bg);
    border-radius: 8px;
    cursor: pointer;
    transition: all 0.2s ease;
    border: 1px solid transparent;
}

.conversation-item:hover {
    background: var(--hover-bg);
    border-color: var(--primary-color);
}

.conversation-item.active {
    background: var(--primary-color);
    color: white;
}

.conversation-title {
    font-weight: 500;
    margin-bottom: 0.25rem;
    font-size: 0.9rem;
}

.conversation-preview {
    font-size: 0.8rem;
    opacity: 0.7;
    overflow: hidden;
    text-overflow: ellipsis;
    white-space: nowrap;
}

.conversation-date {
    font-size: 0.75rem;
    opacity: 0.6;
    margin-top: 0.25rem;
}

.chat-main {
    flex: 1;
    display: flex;
    flex-direction: column;
}

.chat-main .chat-header {
    padding: 1rem;
    border-bottom: 1px solid var(--border-color);
    background: var(--header-bg);
    display: flex;
    justify-content: space-between;
    align-items: center;
}

.chat-info h3 {
    margin: 0;
    font-size: 1.2rem;
    color: var(--text-primary);
}

.chat-status {
    display: flex;
    align-items: center;
    gap: 0.5rem;
    font-size: 0.85rem;
    margin-top: 0.25rem;
}

.chat-status.online {
    color: var(--success-color);
}

.chat-status i {
    font-size: 0.6rem;
}

.chat-actions {
    display: flex;
    gap: 0.5rem;
}

.chat-messages {
    flex: 1;
    overflow-y: auto;
    padding: 1rem;
    background: var(--bg-secondary);
}

.message {
    display: flex;
    margin-bottom: 1rem;
    animation: fadeInUp 0.3s ease;
}

.message.user {
    justify-content: flex-end;
}

.message.bot {
    justify-content: flex-start;
}

.message-avatar {
    width: 40px;
    height: 40px;
    border-radius: 50%;
    display: flex;
    align-items: center;
    justify-content: center;
    margin: 0 0.75rem;
    flex-shrink: 0;
}

.message.user .message-avatar {
    background: var(--primary-color);
    color: white;
    order: 2;
}

.message.bot .message-avatar,
.bot-avatar {
    background: var(--accent-color);
    color: white;
}

.message-content {
    max-width: 70%;
    background: var(--card-bg);
    padding: 0.75rem 1rem;
    border-radius: 12px;
    box-shadow: var(--shadow-sm);
    position: relative;
}

.message.user .message-content {
    background: var(--primary-color);
    color: white;
    border-bottom-right-radius: 4px;
}

.message.bot .message-content {
    border-bottom-left-radius: 4px;
}

.message-text {
    margin: 0;
    line-height: 1.5;
    word-wrap: break-word;
}

.message-time {
    font-size: 0.75rem;
    opacity: 0.6;
    margin-top: 0.5rem;
    text-align: right;
}

.message.bot .message-time {
    text-align: left;
}

.welcome-message {
    display: flex;
    align-items: flex-start;
    gap: 1rem;
    background: var(--card-bg);
    padding: 1.5rem;
    border-radius: 12px;
    margin-bottom: 1rem;
    border: 1px solid var(--border-color);
}

.welcome-message .bot-avatar {
    width: 50px;
    height: 50px;
    border-radius: 50%;
    background: var(--accent-color);
    color: white;
    display: flex;
    align-items: center;
    justify-content: center;
    font-size: 1.5rem;
    flex-shrink: 0;
}

.welcome-message .message-content h4 {
    margin: 0 0 0.5rem 0;
    color: var(--text-primary);
}

.welcome-message .message-content p {
    margin: 0 0 0.5rem 0;
    color: var(--text-secondary);
}

.welcome-message .message-content ul {
    margin: 0.5rem 0;
    padding-left: 1.5rem;
    color: var(--text-secondary);
}

.welcome-message .message-content li {
    margin-bottom: 0.25rem;
}

.chat-input-container {
    padding: 1rem;
    background: var(--card-bg);
    border-top: 1px solid var(--border-color);
}

.chat-input-wrapper {
    display: flex;
    align-items: flex-end;
    gap: 0.5rem;
    background: var(--bg-primary);
    border: 1px solid var(--border-color);
    border-radius: 12px;
    padding: 0.5rem;
    transition: border-color 0.2s ease;
}

.chat-input-wrapper:focus-within {
    border-color: var(--primary-color);
}

#chatInput {
    flex: 1;
    border: none;
    outline: none;
    background: transparent;
    resize: none;
    font-family: inherit;
    font-size: 0.9rem;
    line-height: 1.4;
    color: var(--text-primary);
    min-height: 20px;
    max-height: 120px;
}

#chatInput::placeholder {
    color: var(--text-muted);
}

.input-actions {
    display: flex;
    gap: 0.25rem;
    align-items: flex-end;
}

.input-info {
    display: flex;
    justify-content: space-between;
    align-items: center;
    margin-top: 0.5rem;
    font-size: 0.75rem;
    color: var(--text-muted);
}

.typing-indicator {
    display: flex;
    align-items: center;
    gap: 0.25rem;
    color: var(--primary-color);
}

.typing-indicator i {
    animation: pulse 1.5s infinite;
}

.typing-indicator i:nth-child(2) {
    animation-delay: 0.2s;
}

.typing-indicator i:nth-child(3) {
    animation-delay: 0.4s;
}

@keyframes pulse {
    0%, 60%, 100% {
        opacity: 0.3;
    }
    30% {
        opacity: 1;
    }
}

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

/* Responsive Design */
/* Additional styles for message formatting */
.message-text code {
    background: var(--bg-secondary);
    padding: 0.2rem 0.4rem;
    border-radius: 4px;
    font-family: 'Courier New', monospace;
    font-size: 0.85em;
    color: var(--primary-color);
}

.message-text pre {
    background: var(--bg-secondary);
    padding: 1rem;
    border-radius: 8px;
    overflow-x: auto;
    margin: 0.5rem 0;
    border-left: 4px solid var(--primary-color);
}

.message-text pre code {
    background: none;
    padding: 0;
    color: var(--text-primary);
    font-size: 0.9em;
}

.message.bot .message-text code {
    background: rgba(255, 255, 255, 0.1);
}

.message.bot .message-text pre {
    background: rgba(255, 255, 255, 0.05);
}

.no-conversations {
    text-align: center;
    padding: 2rem 1rem;
    color: var(--text-muted);
}

.no-conversations p {
    margin: 0.5rem 0;
}

@media (max-width: 768px) {
    .codemate-container {
        flex-direction: column;
        height: auto;
    }
    
    .chat-sidebar {
        width: 100%;
        max-height: 200px;
    }
    
    .chat-main {
        min-height: 500px;
    }
    
    .message-content {
        max-width: 85%;
    }
}