:root {
  --na-bg: #f4f6f8;
  --na-sidebar: #1f2937;
  --na-accent: #0d6efd;
}

body {
  background: var(--na-bg);
  min-height: 100vh;
}

.na-sidebar {
  background: var(--na-sidebar);
  min-height: 100vh;
}

.na-sidebar .nav-link {
  color: rgba(255, 255, 255, 0.75);
  border-radius: 0.375rem;
  margin-bottom: 0.25rem;
}

.na-sidebar .nav-link:hover,
.na-sidebar .nav-link.active {
  color: #fff;
  background: rgba(255, 255, 255, 0.1);
}

.na-brand {
  font-weight: 700;
  letter-spacing: 0.02em;
}

.na-card {
  border: 0;
  box-shadow: 0 1px 2px rgba(16, 24, 40, 0.06), 0 1px 3px rgba(16, 24, 40, 0.1);
}

.na-muted {
  color: #6b7280;
}

.table td,
.table th {
  vertical-align: middle;
}