body {
    font-family: "Arial", sans-serif;
    margin: 0;
    background: #f4f4f4;
    color: #333;
  }
  
  header, footer {
    background-color: #111;
    color: white;
    text-align: center;
    padding: 1em;
  }
  
  main {
    display: flex;
    justify-content: center;
    padding: 2em;
  }
  
  .product-card {
    background: white;
    padding: 2em;
    border-radius: 12px;
    box-shadow: 0 0 12px rgba(0,0,0,0.1);
    max-width: 400px;
    width: 100%;
    text-align: center;
  }
  
  .price {
    font-size: 1.2em;
    color: #e60012;
    margin: 1em 0;
  }
  
  .payment-options button {
    margin: 0.5em;
    padding: 0.8em 1.5em;
    font-size: 1em;
    border: none;
    border-radius: 8px;
    cursor: pointer;
  }
  
  .payment-options button:first-child {
    background-color: #09bb07; /* 微信绿 */
    color: white;
  }
  
  .payment-options button:last-child {
    background-color: #ffcc00; /* USDT黄 */
    color: black;
  }