body {
  margin: 0;
  font-family: -apple-system, BlinkMacSystemFont, "Segoe UI", sans-serif;
  background: #111;
  color: #fff;
  min-height: 100vh;
  display: flex;
  align-items: center;
  justify-content: center;
}

.app {
  width: min(480px, calc(100vw - 32px));
  text-align: center;
}

h1 {
  font-size: 30px;
  margin: 0 0 24px;
}

select,
button {
  width: 100%;
  font-size: 20px;
  border-radius: 8px;
  border: 0;
  padding: 16px;
  margin: 8px 0;
}

select {
  background: #222;
  color: #fff;
}

button {
  background: #fff;
  color: #111;
  font-weight: 700;
  cursor: pointer;
}

button.secondary {
  background: #333;
  color: #fff;
}

.block-controls {
  display: grid;
  gap: 8px;
  grid-template-columns: 1fr 1fr;
}

.block-controls button {
  font-size: 17px;
}

button:disabled {
  cursor: not-allowed;
  opacity: 0.45;
}

.status {
  min-height: 48px;
  margin-top: 20px;
  color: #ccc;
  font-size: 18px;
  line-height: 1.35;
}

.small {
  margin-top: 18px;
  font-size: 13px;
  color: #777;
  line-height: 1.4;
}