body {
  font-family: system-ui, sans-serif;
  background: #f6f7fb;
  margin: 0;
  padding: 0;
}

.app {
  max-width: 420px;
  margin: 60px auto;
  padding: 24px;
  background: white;
  border-radius: 14px;
  box-shadow: 0 10px 30px rgba(0,0,0,.08);
  text-align: center;
}

h1 {
  margin-bottom: 4px;
}

.subtitle {
  color: #666;
  margin-bottom: 24px;
}

button {
  font-size: 16px;
  padding: 14px 18px;
  border: none;
  border-radius: 10px;
  background: #4f46e5;
  color: white;
  cursor: pointer;
}

button:disabled {
  opacity: 0.6;
}

#status {
  margin-top: 16px;
  font-size: 14px;
}

progress {
  width: 100%;
  margin-top: 12px;
}