.container {
      max-width: 900px;
      margin: 30px auto;
      background: #fff;
      padding: 20px 30px;
      border-radius: 10px;
      box-shadow: 0 2px 12px rgba(0,0,0,0.1);
    }

    h2 {
      color: #e65c00;
      font-size: 1.3rem;
      margin-top: 30px;
    }

    .form-group {
      display: flex;
      flex-direction: column;
      margin-bottom: 15px;
    }

    .form-group label {
      font-weight: bold;
      margin-bottom: 5px;
    }

    .form-group input,
    .form-group select {
      padding: 8px;
      font-size: 1rem;
      border: 1px solid #ccc;
      border-radius: 4px;
    }

    .form-group input:invalid {
      border-color: #a94442;
      background-color: #fcebea;
    }

    .flex-group {
      display: flex;
      gap: 20px;
      flex-wrap: wrap;
    }

    .flex-2 > div {
      flex: 1 1 48%;
    }

    .flex-3 > div {
      flex: 1 1 31%;
    }

    .currency-buttons {
      margin: 10px 0;
    }

    .currency-buttons button {
      background-color: #f4f4f4;
      border: 1px solid #ccc;
      border-radius: 5px;
      padding: 6px 12px;
      margin-right: 5px;
      cursor: pointer;
    }

    .currency-buttons button.active {
      background-color: #e65c00;
      color: white;
      border-color: #e65c00;
    }

    .summary {
      font-size: 1.1rem;
      font-weight: bold;
      margin-top: 15px;
    }

    .submit-btn {
      background-color: #00a650;
      color: white;
      padding: 12px 25px;
      border: none;
      border-radius: 5px;
      font-size: 1rem;
      cursor: pointer;
      margin-top: 20px;
    }

    @media (max-width: 768px) {
      .flex-group {
        flex-direction: column;
      }

      .flex-2 > div,
      .flex-3 > div {
        flex: 1 1 100%;
      }
    }