.popup-overlay {
      position: fixed; top: 0; left: 0;
      width: 100%; height: 100%;
      background: rgba(0,0,0,0.6);
      display: none; justify-content: center; align-items: center;
      z-index: 9999;
    }

    .popup {
      position: relative;
      background: #fff;
      padding: 30px 25px;
      border-radius: 20px;
      width: 90%; max-width: 420px;
      box-shadow: 0 10px 25px rgba(0,0,0,0.2);
      animation: fadeIn 0.4s ease-in-out;
      text-align: center;
    }

    .close-icon {
      position: absolute; top: 12px; right: 15px;
      font-size: 22px; color: #000000; cursor: pointer;
      transition: color 0.3s;
    }
    .close-icon:hover { color: #185e6f; }

    .popup h2 { margin: 0 0 10px; font-size: 24px; color: #222; }
    .popup p { margin: 0 0 20px; font-size: 15px; color: #555; }

    .popup input {
      width: 100%; padding: 12px; margin: 8px 0;
      border: 1px solid #ddd; border-radius: 10px; font-size: 15px;
      transition: all 0.3s;
    }
    .popup input:focus {
      border-color: #007BFF; outline: none;
      box-shadow: 0 0 5px rgba(0,123,255,0.4);
    }

    .popup button {
      width: 100%; padding: 14px; margin-top: 10px;
      background: #185e6f;
      color: white; border: none; border-radius: 10px;
      cursor: pointer; font-size: 16px; font-weight: bold;
      transition: transform 0.2s, box-shadow 0.2s;
    }
    .popup button:hover {
      transform: translateY(-2px);
      box-shadow: 0 5px 12px rgba(0,0,0,0.15);
    }

    .success-message {
      font-size: 16px;
      color: green;
      font-weight: bold;
      margin-top: 15px;
    }

    @keyframes fadeIn {
      from { opacity: 0; transform: scale(0.9); }
      to { opacity: 1; transform: scale(1); }
    }