body {
    font-family: Arial, sans-serif;
    display: flex;
    flex-direction: column;
    align-items: center;
    justify-content: center;
    height: 100vh;
    margin: 0;
    background-color: #19181a;
}

#shuffleButton {
    padding: 10px 20px;
    font-size: 16px;
    margin-bottom: 20px;
    cursor: pointer;
}

#cardContainer {
    position: relative;
    width: 100%;
    height: 80%;
    border: 2px solid #29272b;
    overflow: hidden;
}

.card {
    width: 100px;
    height: 170px;
    position: absolute;
    cursor: grab;
    perspective: 1000px;
    transition: transform 0.6s;
    transform-style: preserve-3d;
}

.card .front,
.card .back {
    position: absolute;
    width: 100%;
    height: 100%;
    backface-visibility: hidden;
    background-size: cover;
    background-position: center;
    border-radius: 10px;
}

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

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

.card.dragging {
    z-index: 1000;
}

.dragging {
    cursor: grabbing !important;
}