:root {
  --primary: #1b2c63;
  --admin-sidebar: #15244f;
  --admin-bg: #f4f7fc;
  --admin-border: #e3ebfb;
}

body.admin-body {
  font-family: 'Kanit', sans-serif;
  background: var(--admin-bg);
  margin: 0;
}

.admin-layout {
  display: flex;
  min-height: 100vh;
}

.admin-sidebar {
  width: 240px;
  flex-shrink: 0;
  background: var(--admin-sidebar);
  color: #fff;
  display: flex;
  flex-direction: column;
  padding: 24px 16px;
}

.admin-brand strong {
  display: block;
  font-size: 20px;
  font-weight: 600;
}

.admin-brand span {
  font-size: 13px;
  opacity: 0.8;
}

.admin-nav {
  display: flex;
  flex-direction: column;
  gap: 4px;
  margin-top: 28px;
  flex: 1;
}

.admin-nav-link {
  color: rgba(255, 255, 255, 0.85);
  text-decoration: none;
  padding: 10px 14px;
  border-radius: 8px;
  font-size: 15px;
}

.admin-nav-link:hover,
.admin-nav-link.active {
  background: rgba(255, 255, 255, 0.12);
  color: #fff;
}

.admin-sidebar-foot {
  border-top: 1px solid rgba(255, 255, 255, 0.15);
  padding-top: 16px;
}

.admin-user-name {
  font-size: 14px;
  margin-bottom: 8px;
  opacity: 0.9;
}

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

.admin-topbar {
  background: #fff;
  border-bottom: 1px solid var(--admin-border);
  padding: 20px 28px;
}

.admin-page-title {
  font-size: 22px;
  font-weight: 600;
  color: var(--primary);
}

.admin-content {
  padding: 28px;
}

.admin-stat-card {
  background: #fff;
  border: 1px solid var(--admin-border);
  border-radius: 12px;
  padding: 20px;
  height: 100%;
}

.admin-stat-label {
  font-size: 14px;
  color: #5a6b85;
  margin-bottom: 6px;
}

.admin-stat-value {
  font-size: 32px;
  font-weight: 600;
  color: var(--primary);
  line-height: 1.1;
}

.admin-panel {
  background: #fff;
  border: 1px solid var(--admin-border);
  border-radius: 12px;
  padding: 20px;
}

.admin-table th {
  font-weight: 500;
  color: var(--primary);
  white-space: nowrap;
}

.admin-badge {
  font-size: 12px;
  font-weight: 500;
}

.admin-auth-wrap {
  min-height: 100vh;
  display: flex;
  align-items: center;
  justify-content: center;
  padding: 24px;
  background: var(--admin-bg);
}

.admin-auth-card {
  width: 100%;
  max-width: 420px;
  background: #fff;
  border: 1px solid var(--admin-border);
  border-radius: 16px;
  padding: 32px;
  box-shadow: 0 12px 30px rgba(17, 50, 112, 0.08);
}

.admin-auth-title {
  color: var(--primary);
  font-size: 28px;
  font-weight: 600;
  text-align: center;
  margin-bottom: 8px;
}

.admin-auth-subtitle {
  text-align: center;
  color: #5a6b85;
  margin-bottom: 24px;
}

.admin-thumb {
  object-fit: cover;
  border-radius: 6px;
  border: 1px solid var(--admin-border);
}

.admin-thumb-square {
  width: 72px;
  height: 72px;
  object-fit: cover;
}

.admin-desc-preview {
  max-width: 280px;
}

.admin-form-panel {
  max-width: 640px;
}

.admin-form-panel-wide {
  max-width: 820px;
}

.lesson-resource-row {
  background: #f8fafd;
}

.admin-option-block {
  background: #f8fafd;
}

.admin-option-preview {
  max-width: 120px;
  max-height: 80px;
  object-fit: contain;
  border-radius: 6px;
  border: 1px solid var(--admin-border);
  background: #fff;
}

.admin-form-preview {
  max-width: 240px;
  border-radius: 8px;
  border: 1px solid var(--admin-border);
}

.assessment-image-display-size {
  padding: 10px 12px;
  background: #fff;
  border-radius: 8px;
  border: 1px solid var(--admin-border);
}

.admin-chart-wrap {
  position: relative;
  width: 100%;
  max-width: 760px;
  margin: 0 auto 24px;
  padding: 0 8px 48px;
}

.admin-chart-canvas-wrap {
  display: flex;
  justify-content: center;
  align-items: center;
}

#adminScoreRadarChart {
  display: block;
  max-width: 100%;
}

.admin-chart-legend {
  position: absolute;
  right: 0;
  bottom: 0;
  display: flex;
  flex-direction: column;
  align-items: flex-start;
  gap: 6px;
  font-size: 14px;
  color: var(--primary);
  line-height: 1.35;
}

.admin-chart-legend .legend-dot {
  display: inline-block;
  width: 20px;
  height: 20px;
  border-radius: 3px;
  margin-right: 6px;
  vertical-align: middle;
}

.admin-chart-legend .legend-80 { background: #5bc0be; }
.admin-chart-legend .legend-70 { background: #f4d35e; }
.admin-chart-legend .legend-60 { background: #f4a261; }
.admin-chart-legend .legend-low { background: #e76f51; }

@media (max-width: 991.98px) {
  .admin-layout {
    flex-direction: column;
  }

  .admin-sidebar {
    width: 100%;
  }

  .admin-nav {
    flex-direction: row;
    flex-wrap: wrap;
    flex: 0;
  }

  .admin-sidebar-foot {
    display: none;
  }
}