body {
    font-family: sans-serif;
    display: flex;
    flex-direction: column;
    align-items: center;
    background-color: #2c3e50;
    color: #ecf0f1;
}

.game-container {
    width: 600px;
    margin: 20px;
}

.pairs-grid {
    display: grid;
    grid-template-columns: repeat(4, 1fr);
    gap: 10px;
}

.card {
    background-color: #34495e;
    color: #ecf0f1;
    display: flex;
    justify-content: center;
    align-items: center;
    font-size: 2em;
    height: 150px;
    border-radius: 8px;
    cursor: pointer;
    /* user-select: none; */
    transition: transform 0.3s, background-color 0.3s;
}

.card.flipped {
    background-color: #2980b9;
    transform: rotateY(180deg);
}

.card.matched {
    cursor: default;
    background-color: #27ae60;
}

.columns-container {
    display: flex;
    gap: 20px;
    margin-top: 20px;
}

.matched-pairs-column {
    border: 2px dashed #95a5a6;
    width: 250px;
    min-height: 100px;
    padding: 10px;
    display: flex;
    flex-direction: column;
    gap: 10px;
}

.matched-pair-item {
    background-color: #34495e;
    padding: 10px;
    border-radius: 4px;
    text-align: center;
}