* {
      box-sizing: border-box;
    }
    body {
      font-family: 'Segoe UI', sans-serif;
      margin: 0;
      padding: 0;
    }

    .open-button {
      display: inline-block;
      margin: 30px;
      padding: 12px 20px;
      background-color: #007bff;
      color: white;
      text-decoration: none;
      border-radius: 5px;
    }

    .modal {
      position: fixed;
      top: 0; left: 0;
      width: 100%; height: 100%;
      background: rgba(0, 0, 0, 0.5);
      opacity: 0;
      visibility: hidden;
      transition: 0.3s ease;
      z-index: 999;
    }

    .modal:target {
      opacity: 1;
      visibility: visible;
    }

    .modal-content {
      background: #fff;
      margin: 5% auto;
      padding: 30px;
      border-radius: 8px;
      width: 90%;
      max-width: 800px;
      position: relative;
    }

    .close {
      position: absolute;
      top: 15px;
      right: 20px;
      font-size: 28px;
      color: #aaa;
      text-decoration: none;
    }

    .close:hover {
      color: #000;
    }

    form {
      display: flex;
      flex-wrap: wrap;
      gap: 15px;
    }

    .form-group {
      flex: 1 1 45%;
      display: flex;
      flex-direction: column;
    }

    input, select {
      padding: 10px;
      border: 1px solid #ccc;
      border-radius: 5px;
    }

    button {
      margin-top: 15px;
      padding: 12px 20px;
      background-color: #007bff;
      color: white;
      border: none;
      border-radius: 5px;
      cursor: pointer;
    }

    @media (max-width: 600px) {
      .form-group {
        flex: 1 1 100%;
      }
    }