label {
      display: block;
      margin-bottom: 8px;
      font-weight: bold;
      color: #111827;
    }

    .cajas {
      font-size: 16px;
      border-radius: 8px;
      border: 1px solid #d9d9d9;
      background: #5a5a5a;
      cursor: pointer;
      transition: all 0.2s;
      width: 100%;
      max-width: 400px;
    }

    .cajas:hover {
      border-color: #6366f1;
      box-shadow: 0 0 0 3px rgba(99, 102, 241, 0.2);
    }

    /* Fondo oscuro detrás del popup */
    .overlay {
      position: fixed;
      top: 0; left: 0;
      width: 100%; height: 100%;
      background: rgba(0,0,0,0.5);
      display: none;
      z-index: 998;
    }

    /* Caja del popup */
    .popup {
      position: fixed;
      top: 50%; left: 50%;
      transform: translate(-50%, -50%) scale(0.9);
      background: #fff;
      color: #111827;
      padding: 24px 30px;
      border-radius: 12px;
      box-shadow: 0 10px 30px rgba(0,0,0,0.25);
      text-align: center;
      width: 340px;
      display: none;
      z-index: 999;
      transition: all 0.3s ease;
    }

    .popup.show {
      display: block;
      transform: translate(-50%, -50%) scale(1);
    }

    .popup h3 {
      margin: 0 0 10px;
      font-size: 18px;
      color: #4f46e5;
    }

    .popup p {
      margin: 5px 0;
      font-size: 16px;
      color: #374151;
    }

    /* Línea destacada */
    #popupGeneracion {
      font-weight: bold;
      font-size: 16px;
      margin-top: 10px;
    }

    .popup button {
      margin-top: 16px;
      padding: 10px 18px;
      border: none;
      border-radius: 8px;
      background: #4f46e5;
      color: white;
      font-weight: bold;
      cursor: pointer;
      transition: background 0.2s;
    }

    .popup button:hover {
      background: #3730a3;
    }