body {
      font-family: "Microsoft YaHei", sans-serif;
      margin: 0;
      padding: 0;
      background: linear-gradient(135deg, #e6f0ff, #fdfbff);
      text-align: center;
    }

    header {
      background: #0044cc;
      color: white;
      padding: 20px;
      font-size: 1.6em;
    }

    .intro {
      padding: 30px 20px;
      font-size: 1.2em;
      color: #333;
    }

    .product-image {
      max-width: 90%;
      height: auto;
      border-radius: 10px;
      box-shadow: 0 0 15px rgba(0,0,0,0.2);
    }

    .join-btn {
      display: inline-block;
      background: #ff6600;
      color: white;
      font-size: 1.4em;
      padding: 15px 30px;
      border: none;
      border-radius: 50px;
      cursor: pointer;
      animation: pulse 2s infinite;
      transition: transform 0.3s;
      text-decoration: none;
      margin: 40px auto;
    }

    @keyframes pulse {
      0% { transform: scale(1); }
      50% { transform: scale(1.12); }
      100% { transform: scale(1); }
    }

    footer {
      background: #f0f0f0;
      padding: 15px;
      font-size: 0.9em;
      color: #666;
    }
    
        .copyright {
          position: fixed;       /* 永远固定在底部 */
          bottom: 10px;
          width: 100%;
          text-align: center;
          font-size: 12px;
          color: rgba(0, 0, 0, 0.6);
          z-index: 1000;         /* 确保在最上层，不被iframe遮挡 */
        }
        
        .copyright a {
          color: rgba(0, 0, 0, 0.6); /* 链接颜色与文字保持一致 */
          text-decoration: none;     /* 去掉下划线 */
        }
        
        .copyright a:hover {
          text-decoration: underline; /* 鼠标悬停时加下划线，增强可点击性 */
        }