body {
  background-color: #f8f9fa;
  color: #333;
  font-family: "Segoe UI", Tahoma, sans-serif;
}

.navbar {
  margin-bottom: 30px;
}

.error-card {
  max-width: 480px;
  border: none;
  border-radius: 8px;
  box-shadow: 0 4px 12px rgba(0, 0, 0, 0.05);
}

.display-3 {
  font-weight: 700;
}

.text-danger {
  color: #dc3545 !important;
}

.btn-primary {
  border-radius: 4px;
  padding: 0.5rem 1.25rem;
}

@media (max-width: 576px) {
  .error-card {
    margin: 0 1rem;
  }
}