.card-inner {
    position: relative;
    width: 100%;
    height: 100%;
    transform-style: preserve-3d;
    transition: transform 0.8s ease;
}

.portal:hover .card-inner {
    transform: rotateY(180deg);
}

.card-face {
    position: absolute;
    width: 100%;
    height: 100%;
    backface-visibility: hidden;
    border-radius: 10px;
    overflow: hidden;
}

.card-back img {
    width: 100%;
    height: 100%;
    object-fit: cover;
}

.card-back {
    transform: rotateY(0deg);
}

.card-front {
    transform: rotateY(180deg);
}