:root { color-scheme: light dark; font-family: system-ui, sans-serif; }
body { margin: 0; }
main { padding: 1.5rem; }
#test-mode-banner {
  padding: 0.6rem 1rem;
  background: #b45309;
  color: #fff;
  font-weight: 600;
  text-align: center;
}
#test-mode-banner[hidden] { display: none; }