.galeria-extendida-masonry {
    display: block;
    --columnas: 4;
    --gutter: 10px;
}
.galeria-extendida-masonry .item {
    width: calc((100% / var(--columnas)) - var(--gutter));
    margin-bottom: var(--gutter);
}
.galeria-extendida-masonry img {
    width: 100%;
    display: block;
    height: auto;
}
.galeria-nav {
    margin-top: 15px;
    text-align: center;
}
.galeria-mas {
    position: relative;
    padding: 10px 20px;
    font-weight: bold;
    cursor: pointer;
    background-color: #2D7366;
    color: #fff;
    border: none;
    border-radius: 8px;
    overflow: hidden;
}
.loader {
    display: inline-block;
    width: 18px;
    height: 18px;
    border: 2px solid #ccc;
    border-top-color: #fff;
    border-radius: 50%;
    animation: girar 0.7s linear infinite;
}
@keyframes girar { 100%{ transform: rotate(360deg); } }