/* Estilos básicos e responsivos para o PWA */
:root {
  --primary: #1976d2;
  --bg: #fafafa;
  --text: #222;
}
body {
  margin: 0;
  font-family: system-ui, Arial, sans-serif;
  background: var(--bg);
  color: var(--text);
  min-height: 100vh;
  display: flex;
  flex-direction: column;
}
header, footer {
  background: var(--primary);
  color: #fff;
  padding: 1rem;
  text-align: center;
}
main {
  flex: 1;
  display: flex;
  flex-direction: column;
  align-items: center;
  justify-content: center;
  padding: 2rem 1rem;
}
button {
  background: var(--primary);
  color: #fff;
  border: none;
  padding: 0.75rem 1.5rem;
  border-radius: 4px;
  font-size: 1rem;
  cursor: pointer;
  transition: background 0.2s;
}
button:hover {
  background: #125ea2;
}
.offline {
  text-align: center;
  color: var(--primary);
}
@media (max-width: 600px) {
  main { padding: 1rem 0.5rem; }
  h1 { font-size: 1.5rem; }
}