body {
  font-family: sans-serif;
  background: #f8fafc;
  color: #222;
  margin: 0;
}
#app {
  max-width: 480px;
  margin: 2rem auto;
  background: #fff;
  border-radius: 12px;
  box-shadow: 0 2px 16px rgba(0,0,0,0.08);
  padding: 2rem;
}
button, select {
  font-size: 1rem;
  padding: 0.5rem 1rem;
  margin: 0.5rem 0;
  border-radius: 6px;
  border: 1px solid #ddd;
  background: #f1f5f9;
  cursor: pointer;
}
button:hover {
  background: #e2e8f0;
}
input[type="radio"] {
  margin-right: 0.5rem;
}