/* Modern Analytics Dashboard Styles */

.analytics-container {
  padding: 0;
  background: var(--background-primary);
  min-height: 100vh;
  color: var(--text-primary);
}

/* Loading State */
.analytics-loading {
  display: flex;
  align-items: center;
  justify-content: center;
  min-height: 400px;
  background: var(--background-primary);
}

.loading-content {
  text-align: center;
  color: var(--text-secondary);
}

.loading-spinner {
  margin-bottom: 1.5rem;
}

.spinner {
  width: 40px;
  height: 40px;
  border: 4px solid rgba(102, 126, 234, 0.1);
  border-left: 4px solid var(--accent);
  border-radius: 50%;
  animation: spin 1s linear infinite;
  margin: 0 auto;
}

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

.loading-content h3 {
  color: var(--text-primary);
  margin-bottom: 0.5rem;
}

.loading-content p {
  font-size: 0.875rem;
  opacity: 0.8;
}

/* Header Styles */
.analytics-header {
  background: var(--background-secondary);
  color: var(--text-primary);
  padding: 2rem;
  border-radius: 0 0 20px 20px;
  margin-bottom: 2rem;
  box-shadow: 0 4px 20px rgba(0,0,0,0.1);
  border: 1px solid var(--border-color);
}

.header-main {
  display: flex;
  justify-content: space-between;
  align-items: center;
  max-width: 1200px;
  margin: 0 auto;
}

.header-title {
  display: flex;
  align-items: center;
  gap: 1rem;
}

.title-icon {
  width: 48px;
  height: 48px;
  background: var(--accent);
  border-radius: 12px;
  display: flex;
  align-items: center;
  justify-content: center;
  color: white;
}

.title-text h1 {
  font-size: 2rem;
  font-weight: 600;
  margin: 0 0 0.5rem 0;
}

.title-text p {
  font-size: 1rem;
  color: var(--text-secondary);
  margin: 0;
}

.header-actions {
  display: flex;
  align-items: center;
  gap: 1.5rem;
}

.date-range-selector {
  display: flex;
  flex-direction: column;
  gap: 0.5rem;
}

.date-range-selector label {
  font-size: 0.875rem;
  font-weight: 500;
  color: var(--text-secondary);
}

.modern-select {
  background: var(--background-primary);
  border: 1px solid var(--border-color);
  color: var(--text-primary);
  padding: 0.75rem 1rem;
  border-radius: 8px;
  font-size: 0.875rem;
  min-width: 150px;
}

.modern-select option {
  background: var(--background-primary);
  color: var(--text-primary);
}

.btn-refresh {
  background: var(--accent);
  border: 1px solid var(--accent);
  color: white;
  padding: 0.75rem 1.5rem;
  border-radius: 8px;
  font-size: 0.875rem;
  font-weight: 500;
  display: flex;
  align-items: center;
  gap: 0.5rem;
  cursor: pointer;
  transition: all 0.3s ease;
}

.btn-refresh:hover {
  background: var(--accent-dark);
  transform: translateY(-2px);
}

/* Metrics Section */
.metrics-section {
  padding: 0 2rem;
  margin-bottom: 2rem;
}

.metrics-grid {
  display: grid;
  grid-template-columns: repeat(auto-fit, minmax(280px, 1fr));
  gap: 1.5rem;
  max-width: 1200px;
  margin: 0 auto;
}

.metric-card {
  background: var(--background-secondary);
  border-radius: 16px;
  padding: 1.5rem;
  box-shadow: 0 4px 20px rgba(0,0,0,0.08);
  border: 1px solid var(--border-color);
  transition: all 0.3s ease;
  position: relative;
  overflow: hidden;
}

.metric-card:hover {
  transform: translateY(-4px);
  box-shadow: 0 8px 30px rgba(0,0,0,0.12);
}

.metric-card::before {
  content: '';
  position: absolute;
  top: 0;
  left: 0;
  right: 0;
  height: 4px;
  background: var(--accent);
}

.metric-card.primary::before { background: #667eea; }
.metric-card.success::before { background: #10b981; }
.metric-card.warning::before { background: #f59e0b; }
.metric-card.info::before { background: #3b82f6; }

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

.metric-icon {
  width: 40px;
  height: 40px;
  background: rgba(102, 126, 234, 0.1);
  border-radius: 10px;
  display: flex;
  align-items: center;
  justify-content: center;
  color: var(--accent);
}

.metric-trend {
  font-size: 0.875rem;
  font-weight: 600;
  padding: 0.25rem 0.75rem;
  border-radius: 20px;
}

.metric-trend.positive {
  background: rgba(16, 185, 129, 0.1);
  color: #10b981;
}

.metric-trend.neutral {
  background: rgba(107, 114, 128, 0.1);
  color: #6b7280;
}

.metric-body {
  text-align: left;
}

.metric-value {
  font-size: 2.5rem;
  font-weight: 700;
  color: var(--text-primary);
  line-height: 1;
  margin-bottom: 0.5rem;
}

.metric-label {
  font-size: 0.875rem;
  font-weight: 500;
  color: var(--text-secondary);
  margin-bottom: 0.25rem;
}

.metric-subtitle {
  font-size: 0.75rem;
  color: var(--text-muted);
}

/* Tabs */
.analytics-tabs {
  display: flex;
  background: var(--background-secondary);
  border-radius: 12px;
  padding: 0.5rem;
  margin: 0 2rem 2rem;
  border: 1px solid var(--border-color);
  max-width: 1200px;
  margin-left: auto;
  margin-right: auto;
}

.analytics-tab {
  flex: 1;
  display: flex;
  align-items: center;
  justify-content: center;
  gap: 0.5rem;
  padding: 0.75rem 1rem;
  background: transparent;
  border: none;
  border-radius: 8px;
  color: var(--text-secondary);
  font-size: 0.875rem;
  font-weight: 500;
  cursor: pointer;
  transition: all 0.3s ease;
}

.analytics-tab:hover {
  background: var(--background-primary);
  color: var(--text-primary);
}

.analytics-tab.active {
  background: var(--accent);
  color: white;
  box-shadow: 0 2px 8px rgba(102, 126, 234, 0.3);
}

.analytics-tab svg {
  width: 16px;
  height: 16px;
}

/* Tab Content */
.tab-content {
  padding: 0 2rem 2rem;
}

.tab-pane {
  display: none;
}

.tab-pane.active {
  display: block;
}

/* Overview Grid */
.overview-grid {
  display: grid;
  grid-template-columns: 1fr 1fr;
  gap: 2rem;
  margin-bottom: 2rem;
}

.overview-grid .chart-section {
  grid-column: span 1;
}

.overview-grid .stats-section {
  grid-column: 1 / -1;
}

.overview-grid .activity-section {
  grid-column: 1 / -1;
}

/* Engagement Grid */
.engagement-grid {
  display: grid;
  grid-template-columns: 1fr;
  gap: 2rem;
  margin-bottom: 2rem;
}

.engagement-grid .chart-section.full-width {
  grid-column: 1 / -1;
}

/* Top Charts Row - Recent Activity and Activity Distribution side by side */
.top-charts-row {
  display: grid;
  grid-template-columns: 1fr 1fr;
  gap: 2rem;
  margin-bottom: 2rem;
}

.top-charts-row .chart-section {
  margin-bottom: 0;
}

/* Content Sections */
.data-section {
  background: var(--background-secondary);
  border-radius: 12px;
  padding: 1.5rem;
  margin-bottom: 1.5rem;
  border: 1px solid var(--border-color);
}

.chart-section {
  background: var(--background-secondary);
  border-radius: 12px;
  padding: 1.5rem;
  margin-bottom: 1.5rem;
  border: 1px solid var(--border-color);
}

.stats-section {
  background: var(--background-secondary);
  border-radius: 12px;
  padding: 1.5rem;
  margin-bottom: 1.5rem;
  border: 1px solid var(--border-color);
}

.activity-section {
  background: var(--background-secondary);
  border-radius: 12px;
  padding: 1.5rem;
  margin-bottom: 1.5rem;
  border: 1px solid var(--border-color);
}

.data-section h3 {
  color: var(--text-primary);
  font-size: 1.25rem;
  font-weight: 600;
  margin: 0 0 1rem 0;
  display: flex;
  align-items: center;
  gap: 0.5rem;
}

.data-section h3::before {
  content: '';
  width: 4px;
  height: 20px;
  background: var(--accent);
  border-radius: 2px;
}

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

.stat-item {
  display: flex;
  justify-content: space-between;
  align-items: center;
  padding: 1rem;
  background: var(--background-primary);
  border-radius: 8px;
  border: 1px solid var(--border-color);
}

.stat-label {
  color: var(--text-secondary);
  font-size: 0.875rem;
  font-weight: 500;
}

.stat-value {
  color: var(--text-primary);
  font-size: 1.5rem;
  font-weight: 700;
}

/* Chart Container */
.chart-container {
  background: var(--background-secondary);
  border-radius: 12px;
  padding: 1.5rem;
  margin-bottom: 1.5rem;
  border: 1px solid var(--border-color);
}

.chart-container h3 {
  color: var(--text-primary);
  font-size: 1.25rem;
  font-weight: 600;
  margin: 0 0 1rem 0;
  display: flex;
  align-items: center;
  gap: 0.5rem;
}

.chart-container h3::before {
  content: '';
  width: 4px;
  height: 20px;
  background: var(--accent);
  border-radius: 2px;
}

.chart-container canvas {
  width: 100% !important;
  height: 300px !important;
}

/* Activity List */
.activity-list {
  display: flex;
  flex-direction: column;
  gap: 0.75rem;
}

.activity-item {
  display: flex;
  justify-content: space-between;
  align-items: center;
  padding: 0.75rem;
  background: var(--background-primary);
  border-radius: 8px;
  border: 1px solid var(--border-color);
}

.activity-role {
  color: var(--text-primary);
  font-weight: 500;
  text-transform: capitalize;
}

.activity-count {
  color: var(--accent);
  font-weight: 600;
}

/* Performance List */
/* Top Performers Section */
.top-performers-section {
  display: grid;
  grid-template-columns: 1fr 1fr;
  gap: 2rem;
  margin-top: 2rem;
}

.performance-column {
  background: var(--background-secondary);
  border-radius: 12px;
  border: 1px solid var(--border-color);
  overflow: hidden;
}

.performance-column .section-header {
  display: flex;
  align-items: center;
  gap: 1rem;
  padding: 1.5rem;
  border-bottom: 1px solid var(--border-color);
  background: var(--background-primary);
}

.header-icon {
  width: 40px;
  height: 40px;
  background: var(--accent);
  border-radius: 8px;
  display: flex;
  align-items: center;
  justify-content: center;
  color: white;
}

.header-content h3 {
  color: var(--text-primary);
  font-size: 1.25rem;
  font-weight: 600;
  margin: 0 0 0.25rem 0;
}

.header-content p {
  color: var(--text-secondary);
  font-size: 0.875rem;
  margin: 0;
}

.performance-list {
  display: flex;
  flex-direction: column;
  gap: 0.75rem;
  padding: 1.5rem;
}

.performance-item {
  display: flex;
  align-items: center;
  gap: 1rem;
  padding: 1rem;
  background: var(--background-primary);
  border-radius: 8px;
  border: 1px solid var(--border-color);
  transition: all 0.2s ease;
  position: relative;
  overflow: hidden;
}

.performance-item:hover {
  transform: translateY(-1px);
  box-shadow: 0 4px 12px rgba(0,0,0,0.1);
  border-color: var(--accent);
}

.performance-item.top-performer {
  background: var(--background-primary);
  border: 2px solid var(--accent);
  box-shadow: 0 4px 12px rgba(0, 0, 0, 0.1);
  position: relative;
}

.performance-item.top-performer::before {
  content: '';
  position: absolute;
  top: 0;
  left: 0;
  right: 0;
  bottom: 0;
  background: linear-gradient(135deg, var(--accent) 0%, transparent 100%);
  opacity: 0.05;
  border-radius: 8px;
  pointer-events: none;
}

.performance-item.top-performer .rank-badge {
  background: var(--accent);
  color: white;
  border: 2px solid var(--background-primary);
}

.rank-badge {
  display: flex;
  flex-direction: column;
  align-items: center;
  justify-content: center;
  width: 50px;
  height: 50px;
  background: var(--accent);
  border-radius: 50%;
  color: white;
  font-weight: 600;
  position: relative;
  flex-shrink: 0;
}

.rank-number {
  font-size: 1.1rem;
  font-weight: 700;
}

.crown {
  font-size: 0.8rem;
  position: absolute;
  top: -5px;
  right: -5px;
}

.performance-content {
  flex: 1;
  display: flex;
  flex-direction: column;
  gap: 0.5rem;
}

.performance-header {
  display: flex;
  justify-content: space-between;
  align-items: center;
  margin-bottom: 0.5rem;
}

.performance-header h4 {
  color: var(--text-primary);
  font-size: 1rem;
  font-weight: 600;
  margin: 0;
  flex: 1;
}

.grade-badge {
  background: var(--accent);
  color: white;
  padding: 0.25rem 0.75rem;
  border-radius: 20px;
  font-size: 0.875rem;
  font-weight: 600;
  white-space: nowrap;
}

.performance-details {
  display: grid;
  grid-template-columns: 1fr 1fr;
  gap: 0.5rem;
  margin-bottom: 0.75rem;
}

.detail-item {
  display: flex;
  justify-content: space-between;
  align-items: center;
  font-size: 0.875rem;
}

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

.detail-value {
  color: var(--text-primary);
  font-weight: 600;
}

.performance-bar {
  width: 100%;
  height: 6px;
  background: var(--border-color);
  border-radius: 3px;
  overflow: hidden;
}

.bar-fill {
  height: 100%;
  background: linear-gradient(90deg, var(--accent) 0%, #10b981 100%);
  border-radius: 3px;
  transition: width 0.3s ease;
}

/* Responsive Design */
@media (max-width: 768px) {
  .top-performers-section {
    grid-template-columns: 1fr;
    gap: 1.5rem;
  }
  
  .performance-details {
    grid-template-columns: 1fr;
  }
  
  .performance-header {
    flex-direction: column;
    align-items: flex-start;
    gap: 0.5rem;
  }
}

.class-info p {
  color: var(--text-secondary);
  font-size: 0.875rem;
  margin: 0;
}

.class-stats {
  display: flex;
  gap: 1rem;
}

.class-stats .stat {
  color: var(--accent);
  font-weight: 600;
  font-size: 0.875rem;
}

/* Reports */
.reports-content {
  display: flex;
  flex-direction: column;
  gap: 2rem;
}

.report-controls {
  background: var(--background-secondary);
  border-radius: 12px;
  padding: 1.5rem;
  border: 1px solid var(--border-color);
  display: flex;
  gap: 1rem;
  align-items: end;
}

.form-group {
  margin-bottom: 0;
  flex: 1;
}

.form-group label {
  display: block;
  color: var(--text-primary);
  font-weight: 500;
  margin-bottom: 0.5rem;
}

.form-control {
  width: 100%;
  padding: 0.75rem;
  border: 1px solid var(--border-color);
  border-radius: 8px;
  background: var(--background-primary);
  color: var(--text-primary);
  font-size: 0.875rem;
}

.btn {
  padding: 0.75rem 1.5rem;
  border: none;
  border-radius: 8px;
  font-size: 0.875rem;
  font-weight: 500;
  cursor: pointer;
  transition: all 0.3s ease;
}

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

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

/* Reports Dashboard */
.reports-dashboard {
  padding: 0;
  max-width: 100%;
}

/* Reports Header */
.reports-header {
  background: var(--background-secondary);
  border-radius: 16px;
  padding: 1rem 2rem;
  margin-bottom: 2rem;
  border: 1px solid var(--border-color);
}

.header-content {
  display: flex;
  justify-content: flex-end;
  align-items: center;
}

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

.btn-icon {
  width: 40px;
  height: 40px;
  background: var(--background-primary);
  border: 1px solid var(--border-color);
  border-radius: 8px;
  display: flex;
  align-items: center;
  justify-content: center;
  cursor: pointer;
  transition: all 0.2s ease;
  color: var(--text-secondary);
}

.btn-icon:hover {
  background: var(--accent);
  color: white;
  border-color: var(--accent);
}

/* Quick Actions */
.quick-actions {
  background: var(--background-secondary);
  border-radius: 12px;
  padding: 1.5rem;
  margin-bottom: 2rem;
  border: 1px solid var(--border-color);
  display: flex;
  justify-content: space-between;
  align-items: center;
  flex-wrap: wrap;
  gap: 1rem;
}

.action-group {
  display: flex;
  align-items: center;
  gap: 1rem;
}

.action-group label {
  color: var(--text-primary);
  font-weight: 600;
  font-size: 0.875rem;
  white-space: nowrap;
}

.action-buttons {
  display: flex;
  gap: 0.5rem;
}

.action-btn {
  display: flex;
  align-items: center;
  gap: 0.5rem;
  padding: 0.5rem 1rem;
  background: var(--background-primary);
  border: 1px solid var(--border-color);
  border-radius: 8px;
  color: var(--text-primary);
  font-size: 0.875rem;
  font-weight: 500;
  cursor: pointer;
  transition: all 0.2s ease;
  white-space: nowrap;
}

.action-btn:hover {
  background: var(--accent);
  color: white;
  border-color: var(--accent);
}

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

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

.format-selector {
  display: flex;
  gap: 0.25rem;
  background: var(--background-primary);
  border-radius: 8px;
  padding: 0.25rem;
  border: 1px solid var(--border-color);
}

.format-btn {
  padding: 0.5rem 1rem;
  background: transparent;
  border: none;
  border-radius: 6px;
  color: var(--text-secondary);
  font-size: 0.875rem;
  font-weight: 500;
  cursor: pointer;
  transition: all 0.2s ease;
  white-space: nowrap;
}

.format-btn.active,
.format-btn:hover {
  background: var(--accent);
  color: white;
}

/* Reports Grid */
.reports-grid {
  display: grid;
  grid-template-columns: repeat(auto-fit, minmax(350px, 1fr));
  gap: 1.5rem;
  margin-bottom: 2rem;
}

.report-category-card {
  background: var(--background-secondary);
  border-radius: 16px;
  border: 1px solid var(--border-color);
  overflow: hidden;
  transition: all 0.3s ease;
}

.report-category-card:hover {
  transform: translateY(-2px);
  box-shadow: 0 8px 30px rgba(0,0,0,0.1);
}

.category-header {
  padding: 1.5rem;
  border-bottom: 1px solid var(--border-color);
  display: flex;
  align-items: center;
  gap: 1rem;
}

.category-icon {
  width: 40px;
  height: 40px;
  border-radius: 10px;
  display: flex;
  align-items: center;
  justify-content: center;
  color: white;
}

.category-icon.academic {
  background: linear-gradient(135deg, #667eea 0%, #764ba2 100%);
}

.category-icon.attendance {
  background: linear-gradient(135deg, #f093fb 0%, #f5576c 100%);
}

.category-icon.teacher {
  background: linear-gradient(135deg, #4facfe 0%, #00f2fe 100%);
}

.category-icon.system {
  background: linear-gradient(135deg, #43e97b 0%, #38f9d7 100%);
}

.category-info h3 {
  color: var(--text-primary);
  font-size: 1.25rem;
  font-weight: 600;
  margin: 0 0 0.25rem 0;
}

.category-info p {
  color: var(--text-secondary);
  font-size: 0.875rem;
  margin: 0;
}

.report-list {
  padding: 0;
}

.report-item {
  display: flex;
  align-items: center;
  gap: 1rem;
  padding: 1rem 1.5rem;
  border-bottom: 1px solid var(--border-color);
  cursor: pointer;
  transition: all 0.2s ease;
  position: relative;
}

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

.report-item:hover {
  background: var(--accent);
  color: white;
}

.report-item:hover .report-content h4,
.report-item:hover .report-content p {
  color: white;
}

.report-item:hover .report-arrow {
  color: white;
  transform: translateX(4px);
}

.report-icon {
  font-size: 1.5rem;
  width: 32px;
  text-align: center;
}

.report-content {
  flex: 1;
}

.report-content h4 {
  color: var(--text-primary);
  font-size: 1rem;
  font-weight: 600;
  margin: 0 0 0.25rem 0;
  transition: color 0.2s ease;
}

.report-content p {
  color: var(--text-secondary);
  font-size: 0.875rem;
  margin: 0;
  transition: color 0.2s ease;
}

.report-arrow {
  color: var(--text-secondary);
  font-size: 1.25rem;
  font-weight: 600;
  transition: all 0.2s ease;
}


/* Responsive Design */
@media (max-width: 768px) {
  .reports-grid {
    grid-template-columns: 1fr;
  }
  
  .quick-actions {
    flex-direction: column;
    align-items: stretch;
  }
  
  .action-group {
    justify-content: space-between;
  }
  
  .header-content {
    flex-direction: column;
    gap: 1rem;
    align-items: flex-start;
  }
  
  .action-buttons {
    flex-wrap: wrap;
  }
  
  .format-selector {
    flex-wrap: wrap;
  }
}

/* Chart Legend */
.chart-legend {
  display: flex;
  gap: 1rem;
  align-items: center;
}

.legend-item {
  display: flex;
  align-items: center;
  gap: 0.5rem;
  font-size: 0.875rem;
  color: var(--text-secondary);
}

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

.legend-color.students { background: #667eea; }
.legend-color.teachers { background: #10b981; }
.legend-color.admins { background: #f59e0b; }
.legend-color.grade-a { background: #10b981; }
.legend-color.grade-b { background: #3b82f6; }
.legend-color.grade-c { background: #f59e0b; }
.legend-color.grade-f { background: #ef4444; }
.legend-color.present { background: #10b981; }
.legend-color.absent { background: #ef4444; }
.legend-color.late { background: #f59e0b; }
.legend-color.login-total { background: #3b82f6; }
.legend-color.login-unique { background: #10b981; }

/* Activity Timeline Markers */
.timeline-marker.login { background: #3b82f6; }
.timeline-marker.activity { background: #10b981; }
.timeline-marker.message { background: #f59e0b; }
.timeline-marker.placeholder { background: #6b7280; }

/* Chart Controls */
.chart-controls {
  display: flex;
  gap: 0.5rem;
}

.btn-small {
  padding: 0.5rem 1rem;
  border: 1px solid var(--border-color);
  background: var(--background-primary);
  color: var(--text-secondary);
  border-radius: 6px;
  font-size: 0.75rem;
  font-weight: 500;
  cursor: pointer;
  transition: all 0.3s ease;
}

.btn-small:hover {
  background: var(--accent);
  color: white;
  border-color: var(--accent);
}

.btn-small.active {
  background: var(--accent);
  color: white;
  border-color: var(--accent);
}


/* Activity Timeline */
.activity-timeline {
  display: flex;
  flex-direction: column;
  gap: 1rem;
}

.timeline-item {
  display: flex;
  align-items: flex-start;
  gap: 1rem;
  padding: 1rem;
  background: var(--background-primary);
  border-radius: 8px;
  border: 1px solid var(--border-color);
}

.timeline-marker {
  width: 8px;
  height: 8px;
  background: var(--accent);
  border-radius: 50%;
  margin-top: 0.5rem;
  flex-shrink: 0;
}

.timeline-content {
  flex: 1;
}

.activity-title {
  color: var(--text-primary);
  font-weight: 600;
  margin-bottom: 0.25rem;
}

.activity-description {
  color: var(--text-secondary);
  font-size: 0.875rem;
  margin-bottom: 0.25rem;
}

.activity-time {
  color: var(--text-muted);
  font-size: 0.75rem;
}

/* Responsive Design */
@media (max-width: 768px) {
  .overview-grid {
    grid-template-columns: 1fr;
  }
  
  .engagement-grid {
    grid-template-columns: 1fr;
  }
  
  .top-charts-row {
    grid-template-columns: 1fr;
  }
  
  .chart-legend {
    flex-wrap: wrap;
  }
  
  .chart-controls {
    flex-wrap: wrap;
  }
}

.content-section {
  background: var(--background-secondary);
  border-radius: 16px;
  box-shadow: 0 4px 20px rgba(0,0,0,0.08);
  border: 1px solid var(--border-color);
  overflow: hidden;
}

.content-section.full-width {
  grid-column: 1 / -1;
}

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

.section-header h3 {
  font-size: 1.25rem;
  font-weight: 600;
  color: var(--text-primary);
  margin: 0;
}

.section-actions {
  display: flex;
  align-items: center;
  gap: 0.75rem;
}

.btn-icon {
  width: 32px;
  height: 32px;
  background: var(--background-primary);
  border: 1px solid var(--border-color);
  border-radius: 8px;
  display: flex;
  align-items: center;
  justify-content: center;
  cursor: pointer;
  transition: all 0.3s ease;
  color: var(--text-secondary);
}

.btn-icon:hover {
  background: var(--accent);
  color: white;
  transform: translateY(-1px);
}

.btn-primary-small {
  background: var(--accent);
  color: white;
  border: none;
  padding: 0.5rem 1rem;
  border-radius: 8px;
  font-size: 0.875rem;
  font-weight: 500;
  cursor: pointer;
  transition: all 0.3s ease;
}

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

.status-indicator {
  padding: 0.25rem 0.75rem;
  border-radius: 20px;
  font-size: 0.75rem;
  font-weight: 600;
}

.status-indicator.healthy {
  background: rgba(16, 185, 129, 0.1);
  color: #10b981;
}

.section-content {
  padding: 1.5rem;
}

/* User Stats */
.user-stats {
  display: flex;
  flex-direction: column;
  gap: 1rem;
}

.stat-row {
  display: grid;
  grid-template-columns: 1fr 1fr;
  gap: 1rem;
}

.stat-item {
  display: flex;
  align-items: center;
  gap: 0.75rem;
  padding: 0.75rem;
  background: var(--background-primary);
  border-radius: 10px;
  border: 1px solid var(--border-color);
}

.stat-icon {
  width: 32px;
  height: 32px;
  border-radius: 8px;
  display: flex;
  align-items: center;
  justify-content: center;
  font-size: 1.25rem;
}

.stat-info {
  flex: 1;
}

.stat-value {
  font-size: 1.5rem;
  font-weight: 700;
  color: var(--text-primary);
  line-height: 1;
}

.stat-label {
  font-size: 0.75rem;
  color: var(--text-secondary);
  font-weight: 500;
}

/* Class Performance */
.class-list {
  display: flex;
  flex-direction: column;
  gap: 1rem;
}

.class-item {
  display: flex;
  justify-content: space-between;
  align-items: center;
  padding: 1rem;
  background: var(--background-primary);
  border-radius: 10px;
  border: 1px solid var(--border-color);
}

.class-info {
  flex: 1;
}

.class-name {
  font-weight: 600;
  color: var(--text-primary);
  margin-bottom: 0.25rem;
}

.class-teacher {
  font-size: 0.875rem;
  color: var(--text-secondary);
}

.class-metrics {
  display: flex;
  gap: 1rem;
}

.metric {
  text-align: center;
}

.metric-value {
  font-size: 1.25rem;
  font-weight: 700;
  color: var(--accent);
  display: block;
}

.metric-label {
  font-size: 0.75rem;
  color: var(--text-secondary);
}

/* Quick Reports */
.quick-reports {
  display: flex;
  flex-direction: column;
  gap: 0.75rem;
}

.report-item {
  display: flex;
  align-items: center;
  gap: 1rem;
  padding: 1rem;
  background: var(--background-primary);
  border-radius: 10px;
  cursor: pointer;
  transition: all 0.3s ease;
  border: 1px solid var(--border-color);
}

.report-item:hover {
  background: var(--accent);
  color: white;
  transform: translateY(-2px);
}

.report-icon {
  font-size: 1.5rem;
}

.report-info {
  flex: 1;
}

.report-title {
  font-weight: 600;
  margin-bottom: 0.25rem;
}

.report-desc {
  font-size: 0.875rem;
  opacity: 0.8;
}

/* System Health */
.system-health {
  display: flex;
  flex-direction: column;
  gap: 0.75rem;
}

.health-item {
  display: flex;
  align-items: center;
  gap: 0.75rem;
  padding: 0.75rem;
  background: var(--background-primary);
  border-radius: 10px;
  border: 1px solid var(--border-color);
}

.health-icon {
  font-size: 1.25rem;
}

.health-info {
  flex: 1;
}

.health-label {
  font-weight: 600;
  color: var(--text-primary);
  margin-bottom: 0.25rem;
}

.health-status {
  font-size: 0.875rem;
  color: var(--text-secondary);
}

/* Chart Container */
.chart-container {
  height: 300px;
  position: relative;
}

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

.placeholder-icon {
  font-size: 3rem;
  margin-bottom: 1rem;
  opacity: 0.5;
}

/* Empty State */
.empty-state {
  text-align: center;
  padding: 2rem;
  color: var(--text-secondary);
}

.empty-icon {
  font-size: 3rem;
  margin-bottom: 1rem;
  opacity: 0.5;
}

/* Error State */
.error-state {
  text-align: center;
  padding: 3rem;
  color: var(--text-secondary);
}

.error-icon {
  font-size: 4rem;
  margin-bottom: 1rem;
  opacity: 0.5;
}

.error-state h2 {
  color: var(--text-primary);
  margin-bottom: 1rem;
}

/* Responsive Design */
@media (max-width: 768px) {
  .header-main {
    flex-direction: column;
    gap: 1.5rem;
    align-items: flex-start;
  }

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

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

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

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

  .class-item {
    flex-direction: column;
    align-items: flex-start;
    gap: 1rem;
  }

  .class-metrics {
    width: 100%;
    justify-content: space-around;
  }
}