/* Overlay de carga */
#loading-overlay {
    position: fixed;
    top: 0;
    left: 0;
    width: 100%;
    height: 100%;
    background: white;
    display: flex;
    justify-content: center;
    align-items: center;
    z-index: 9999;
    font-family: sans-serif;
    font-size: 1.5rem;
    transition: opacity 0.5s ease;
}
/* Contenido principal: inicialmente invisible */
#main-content {
    visibility: hidden;
    opacity: 0;
    transition: visibility 0s, opacity 0.5s ease;
}
/* Clase que se añade al body cuando todo ha cargado */
.loaded #main-content {
    visibility: visible;
    opacity: 1;
}
.loaded #loading-overlay {
    opacity: 0;
    visibility: hidden;
}