.popup-overlay {
    display: none; /* 默认隐藏 */
    position: fixed;
    top: 0;
    left: 0;
    width: 100%;
    height: 100%;
    background-color: rgba(0, 0, 0, 0.6);
    align-items: center;
    justify-content: center;
    z-index: 10000;
    font-family: 'Microsoft YaHei', sans-serif;
  }
  /* 弹窗内容卡片 */
  .popup-content {
    background: #ffffff;
    width: 90%;
    max-width: 360px;
    border-radius: 20px;
    padding: 25px 20px 20px;
    text-align: center;
    position: relative;
    box-shadow: 0 15px 40px rgba(0, 0, 0, 0.2);
    animation: popupFadeIn 0.3s ease;
  }
  @keyframes popupFadeIn {
    from { opacity: 0; transform: scale(0.9); }
    to { opacity: 1; transform: scale(1); }
  }
  /* 关闭按钮 (X) */
  .popup-close {
    position: absolute;
    top: 12px;
    right: 16px;
    font-size: 28px;
    font-weight: 400;
    color: #aaa;
    cursor: pointer;
    line-height: 1;
    transition: color 0.2s;
    z-index: 1;
  }
  .popup-close:hover {
    color: #333;
  }
  /* 主标题 */
  .popup-title {
    font-size: 22px;
    font-weight: 600;
    color: #1a1a1a;
    margin: 5px 0 10px;
    letter-spacing: 1px;
  }
  /* 二维码图片区域 */
  .popup-qrcode {
    margin: 15px auto;
    width: 200px;
    height: 200px;
    background-color: #f5f5f5;
    display: flex;
    align-items: center;
    justify-content: center;
    border-radius: 12px;
    padding: 8px;
    box-shadow: 0 4px 10px rgba(0,0,0,0.05);
  }
  .popup-qrcode img {
    width: 100%;
    height: 100%;
    object-fit: contain;
    display: block;
    border-radius: 8px;
  }
  /* 说明文字 */
  .popup-desc {
    font-size: 15px;
    color: #555;
    margin: 15px 0 20px;
    line-height: 1.5;
    padding: 0 5px;
  }
  /* 我知道了按钮 */
  .popup-btn {
    background: linear-gradient(145deg, #07c160, #06b356);
    border: none;
    color: white;
    font-size: 17px;
    font-weight: 500;
    padding: 12px 30px;
    border-radius: 40px;
    cursor: pointer;
    width: 80%;
    max-width: 220px;
    margin: 0 auto 5px;
    transition: background 0.2s, transform 0.1s;
    border: none;
    outline: none;
    box-shadow: 0 6px 12px rgba(7, 193, 96, 0.3);
  }
  .popup-btn:hover {
    background: linear-gradient(145deg, #06ab56, #059f4c);
    transform: scale(1.02);
  }
  .popup-btn:active {
    transform: scale(0.98);
  }
  /* 防止页面滚动 */
  body.popup-active {
    overflow: hidden;
  }
  /* 兼容小屏 */
  @media (max-width: 480px) {
    .popup-content { padding: 20px 15px; }
    .popup-qrcode { width: 170px; height: 170px; }
    .popup-title { font-size: 20px; }
  }