body {
  font-family: -apple-system, BlinkMacSystemFont, "Segoe UI", Roboto, "Helvetica Neue", Arial, sans-serif;
  background-color: #f8f9fa;
}

.sidebar {
  min-height: 100vh;
  background-color: #212529;
}

.sidebar a {
  color: #adb5bd;
  text-decoration: none;
  padding: 12px 20px;
  display: block;
}

.sidebar a:hover, .sidebar a.active {
  color: #ffffff;
  background-color: #0d6efd;
}

.card-stat {
  border: none;
  border-radius: 10px;
  box-shadow: 0 4px 6px rgba(0,0,0,0.05);
}

.table-responsive {
  background: #ffffff;
  border-radius: 8px;
  padding: 15px;
  box-shadow: 0 2px 4px rgba(0,0,0,0.04);
}