body 
{
    font-family: Arial, sans-serif;
    display: flex;
    flex-direction: column;
    align-items: center;
    margin-top: 50px;
}
.controls 
{
    margin-bottom: 20px;
    display: flex;
    gap: 10px;
}
#game-board 
{
    display: grid;
    gap: 10px;
    margin-top: 20px;
}
.timer-display 
{
    font-size: 20px;
    font-weight: bold;
    color: #d9534f;
}
.card {
    width: 80px;
    height: 80px;
    background-color: #2c3e50;
    color: transparent; 
    display: flex;
    justify-content: center;
    align-items: center;
    font-size: 40px;
    cursor: pointer;
    border-radius: 8px;
    user-select: none;
    transition: transform 0.3s, background-color 0.3s;
}
.card.flipped {
    background-color: #ecf0f1;
    color: #2c3e50;
    border: 2px solid #2c3e50;
    transform: rotateY(180deg);
}