.contColumnas {
      display: flex;
      flex-direction: row;
      gap: 20px;
      justify-content: center;
      padding: 30px;
    }
    .column {
      display: flex;
      flex-direction: column;
      gap: 20px;
    }
    .card {
      padding: 10px 18px;
      border: 2px solid #00796b;
      border-radius: 15px;
      background-color: #e0f7fa;
      cursor: pointer;
      transition: background-color 0.3s, opacity 0.5s;
      position: relative;
      display: flex;
    }
    .card img{
      width: 10px;
      transform: rotate(90deg);
    }
    .card.expanded {
      max-height: 500px;
    }
    .card.correct {
      background-color: #c8e6c9;
      border-color: #2e7d32;
    }
    .card.incorrect {
      background-color: #ffcdd2;
      border-color: #c62828;
    }
    #message.incorrect p{
      color:crimson
    }
    .card.disappear {
      opacity: 0;
      pointer-events: none;
    }
    .selected {
      box-shadow: 0 0 5px 3px #4dd0e1;
    }
    #message {
      margin-top: 20px;
      font-size: 20px;
      font-weight: bold;
      color: var(--success-color-ultra-dark);
    }
    #message p{
      padding: 0.5em;
    }
    .column#concepts{
      width: 30%;
    }
@media screen and (max-width:60em) {
  .contColumnas{
    gap: 10px;
    padding: 0px;
  }
  #relacion-conceptos .container-middle{
    height: auto!important;
  }
  .column#concepts{
      width: 40%;
  }
  .card {
      padding: 5px 15px 5px 5px;
    }
  
}
.justify-content-center{
  justify-content: center;
}
.progress-container {
      width: 100%;
      max-width: 400px;
      background-color: #eee;
      border-radius: 12px;
      overflow: hidden;
      height: 30px;
      margin-bottom: 20px;
      box-shadow: inset 0 1px 3px rgba(0, 0, 0, 0.1);
      position: relative;
    }

    .progress-bar {
      height: 100%;
      width: 0%;
      background: linear-gradient(90deg, #4caf50, #81c784);
      display: flex;
      align-items: center;
      justify-content: flex-end;
      color: white;
      font-weight: bold;
      padding-right: 10px;
      font-size: 0.9rem;
      white-space: nowrap;
      animation-duration: 1.8s;
      animation-fill-mode: forwards;
      animation-timing-function: ease-out;
    }
    .bar-25 .progress-bar {
      animation-name: progress25;
    }
    .bar-50 .progress-bar {
      animation-name: progress50;
    }
    .bar-75 .progress-bar {
      animation-name: progress75;
    }

    .bar-100 .progress-bar {
      animation-name: progress100;
    }

    @keyframes progress25 {
      from { width: 0%; }
      to   { width: 25%; }
    }
    @keyframes progress50 {
      from { width: 25%; }
      to   { width: 50%; }
    }
    @keyframes progress75 {
      from { width: 50%; }
      to   { width: 75%; }
    }

    @keyframes progress100 {
      from { width: 75%; }
      to   { width: 100%; }
    }

    /* Texto fijo al final */
    .progress-label {
      position: absolute;
      left: 10px;
      top: 0;
      bottom: 0;
      display: flex;
      align-items: center;
      font-size: 0.9rem;
      font-weight: bold;
      color: white;
      z-index: 1;
      pointer-events: none;
    }

    @media (max-width: 480px) {
      .progress-label {
        font-size: 0.8rem;
      }
    }