body {
    margin: 0;
    padding: 0;
    font-family: 'Poppins', sans-serif;
    color: white;
    min-height: 100vh;
    display: flex;
    align-items: center;
    justify-content: center;

    background-image: url("https://hildastrauss.com/upload/stblog/1/1122/1511/11221511large.jpg");
    background-size: cover;
    background-repeat: no-repeat;
    background-position: center;
    position: relative;
    overflow: hidden;
  }

  body::before {
    content: "";
    position: absolute;
    top: 0; left: 0;
    width: 100%; height: 100%;
    background: radial-gradient(circle at 20% 20%, rgba(255,255,255,0.08), transparent 60%),
                radial-gradient(circle at 80% 80%, rgba(0,255,255,0.12), transparent 60%);
    animation: mover 10s infinite alternate;
    z-index: 0;
    pointer-events: none;
  }
    @keyframes mover {
      from { background-position: 0% 0%, 100% 100%; }
      to { background-position: 100% 100%, 0% 0%; }
    }

    .contenido {
      position: relative;
      z-index: 1;
      width: 100%;
    }

    .lado-izq h1 {
      font-size: 3em;
      font-weight: 800;
      text-shadow: 5px 3px 6px rgba(1,1,0.9,0.6);
    }
    .lado-izq p {
      font-size: 3.5em;
      font-weight: 400;
      text-shadow: 2px 2px 5px rgba(0,0,0,0.5);
    }
    .lado-izq .frase {
      margin-top: 40px;
      font-size: 3em;
      font-weight: 600;
      text-shadow: 3px 3px 8px rgba(0,0,0,0.7);
    }

    .escudo {
      max-width: 180px;
      display: block;
      margin: auto;
    }

    @media (max-width: 768px) {
      .lado-izq h1 { font-size: 2.2em; }
      .lado-izq p { font-size: 1.2em; }
      .lado-izq .frase { font-size: 1.3em; }
      .escudo { max-width: 100px; margin-top: 20px; }
    }
    #opcionesUsuario {
      max-height: 0;
      overflow: hidden;
      transition: max-height 0.4s ease, opacity 0.4s ease;
      opacity: 0;
    }

    #opcionesUsuario.show {
      max-height: 300px; /* espacio suficiente para los botones */
      opacity: 1;
    }