* {
      box-sizing: border-box;
    }

    .container {
      display: flex;
      gap: 30px;
      flex-wrap: wrap;
      justify-content: center;
      align-items: center;
    }

    .card {
      width: 240px;
      padding: 16px 14px;
      border-radius: 16px;
      background: rgba(255, 255, 255, 0.1);
      backdrop-filter: blur(10px);
      box-shadow: 0 6px 16px rgba(0, 0, 0, 0.12);
      text-align: center;
      border: 2px solid transparent;
      transition: all 0.3s ease;
    }

    .card:hover {
      transform: translateY(-5px);
      border-image: linear-gradient(135deg, #28a745, #218838) 1;
    }

    .card h3 {
      font-size: 16px;
      margin: 4px 0 10px;
      color: #222;
    }

    .pay-button {
      padding: 10px 18px;
      font-size: 14px;
      font-weight: 600;
      border: none;
      border-radius: 8px;
      background: linear-gradient(135deg, #00c6ff, #0072ff);
      color: #fff;
      cursor: pointer;
      transition: all 0.3s ease;
      display: inline-flex;
      align-items: center;
      gap: 8px;
      text-decoration: none;
      box-shadow: 0 3px 10px rgba(0, 114, 255, 0.3);
    }

    .pay-button:hover {
      background: linear-gradient(135deg, #0072ff, #0056cc);
      transform: scale(1.05);
    }

    .pay-button i {
      font-size: 14px;
    }

    @media (max-width: 600px) {
      .card {
        width: 100%;
        max-width: 260px;
      }
    }