* { margin: 0; padding: 0; box-sizing: border-box; }
  body {
    font-family: -apple-system, BlinkMacSystemFont, "Segoe UI", Roboto, "Helvetica Neue", Arial, sans-serif;
    background: #fff;
    display: flex;
    justify-content: center;
    align-items: center;
    min-height: 100vh;
    color: #333;
  }
  .card {
    padding: 48px 20px;
    max-width: 480px;
    width: 90%;
    text-align: center;
  }
  .card h1 {
    font-size: 32px;
    font-weight: 600;
    margin-bottom: 32px;
    color: #1a1a2e;
  }
  .target-url {
    background: #f7f7f7;
    border-radius: 8px;
    padding: 24px 20px;
    font-size: 16px;
    word-break: break-all;
    color: #333;
    margin-bottom: 24px;
    border: 1px solid #e0e0e0;
    font-family: monospace;
  }
  .hint {
    font-size: 14px;
    color: #666;
    margin-bottom: 20px;
    line-height: 1.6;
  }
  .btn {
    display: inline-block;
    padding: 12px 32px;
    background: #000;
    color: #fff;
    border: none;
    border-radius: 8px;
    font-size: 16px;
    cursor: pointer;
    text-decoration: none;
    transition: background 0.2s;
  }
  .btn:hover {
    background: #333;
  }
  .countdown {
    margin-top: 20px;
    font-size: 14px;
    color: #666;
  }