body {
  font-size: 1.2rem;
  background-color: #f2f2f2;
  padding: 20px;
}

.card {
  background-color: #fff;
  border-radius: 12px;
  box-shadow: 0 4px 12px rgba(0, 0, 0, 0.08);
}

input.form-control {
  font-size: 1rem;
  padding: 10px 12px;
  border-radius: 6px;
}

button {
  font-size: 1.1rem;
}

#qrcode canvas {
  margin: 0 auto;
}

#countdown {
  font-size: 1rem;
  color: #007bff !important; /* ✅ 强制蓝色，兼容所有浏览器 */
}

#paymentBox {
  transition: all 0.3s ease-in-out;
}
#clear_rate {
  min-width: 60px;
}