body {
    background-image: url('c.jpeg');
    font-family: 'Georgia', serif;
    display: flex;
    justify-content: center;
    align-items: center;
    height: 100vh;
    margin: 0;
    overflow: hidden;
}

.card-container {
    perspective: 1000px;
}

.card {
    width: 300px;
    height: 450px;
    position: relative;
    transform-style: preserve-3d;
    transition: transform 1s;
    cursor: pointer;
}

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

.card-front, .card-inside {
    position: absolute;
    width: 100%;
    height: 100%;
    backface-visibility: hidden;
    border-radius: 15px;
    box-shadow: 0 10px 20px rgba(0, 0, 0, 0.2);
}

.card-front {
    /*background-color: #8e3cd1;*/
    background-image: url('12.jpeg');
    display: flex;
    flex-direction: column;
    justify-content: center;
    align-items: center;
    text-align: center;
    color: rgb(0, 0, 0);
}

.stamp {
    font-size: 10rem;
    margin-bottom: 20px;
    animation: pulse 0.4s infinite;
}

.text {
    font-size: 4rem;
    letter-spacing: 1px;
}

.card-inside {
    background-image: url('ad.jpeg');
    transform: rotateY(180deg);
    padding: 30px;
    box-sizing: border-box;
    display: flex;
    flex-direction: column;
    justify-content: center;
    align-items: center;
    text-align: center;
    color: #000000;
}

.card-inside p {
    margin: 10px 0;
    line-height: 1.6;
}

/* Animación para el sello */
@keyframes pulse {
    0% { transform: scale(1); }
    50% { transform: scale(1.1); }
    100% { transform: scale(1); }
}