.app-shell {
  display: flex;
  flex-direction: column;
  align-items: center;
  justify-content: center;
  min-height: 100vh;
  background: linear-gradient(135deg, #ffffff 0%, #f6f8fb 100%);
  font-family: -apple-system, BlinkMacSystemFont, 'Segoe UI', Roboto, sans-serif;
  color: #224675;
  margin: 0;
  padding: 2rem;
  box-sizing: border-box;
}
.app-shell h1 {
  font-size: 1.75rem;
  font-weight: 700;
  margin: 0 0 0.5rem;
}
.app-shell p {
  margin: 0;
  font-size: 0.875rem;
  color: #64748b;
}
.app-shell .spinner {
  width: 32px;
  height: 32px;
  margin-top: 2rem;
  border: 3px solid #e2e8f0;
  border-top-color: #224675;
  border-radius: 50%;
  animation: spin 0.8s linear infinite;
}
@keyframes spin { to { transform: rotate(360deg); } }