.overlay {
    position: fixed;
    top: 0; left: 0;
    width: 100%; height: 100%;
    background: rgba(0, 0, 0, 0.4);
    backdrop-filter: blur(4px);
    z-index: 998;
  }

  .hidden {
    display: none;
  }

  /* Modal box */
  .modal {
    position: fixed;
    top: 50%; left: 50%;
    transform: translate(-50%, -50%);
    background: white;
    border-radius: 10px;
    z-index: 999;
    width: 90%;
    max-width: 400px;
    box-shadow: 0 0 15px rgba(0,0,0,0.3);
    padding: 25px;
  }

  .modal-content {
    position: relative;
  }

  .modal-content h2 {
    text-align: center;
    color: #00bcd4;
    margin-bottom: 20px;
  }

  .modal-content input {
    width: 100%;
    padding: 10px;
    margin: 8px 0;
    border: 1px solid #ccc;
    border-radius: 6px;
  }

  .btn-submit {
    background-color: #00bcd4;
    color: white;
    border: none;
    padding: 10px;
    width: 100%;
    margin-top: 10px;
    border-radius: 6px;
    font-weight: bold;
    cursor: pointer;
  }

  .btn-submit:hover {
    background-color: #0097a7;
  }

  .close-btn {
    position: absolute;
    top: -10px;
    right: -10px;
    background: #00bcd4;
    color: white;
    font-size: 18px;
    border-radius: 50%;
    width: 30px; height: 30px;
    text-align: center;
    line-height: 30px;
    cursor: pointer;
  }