body {
    display: flex;
    justify-content: center;
    align-items: center;
    min-height: 100vh;
    margin: 0;
    background-color: #f0f0f0;
    font-family: Arial, sans-serif;
}

.game-container {
    text-align: center;
}

h1 {
    color: #333;
    margin-bottom: 20px;
}

.grid {
    display: grid;
    gap: 10px;
    margin: 20px;
}

.grid-2-3 {
    grid-template-columns: repeat(3, 1fr);
    grid-template-rows: repeat(2, 1fr);
}

.grid-4-4 {
    grid-template-columns: repeat(4, 1fr);
    grid-template-rows: repeat(4, 1fr);
}

.grid-4-3 {
    grid-template-columns: repeat(3, 1fr);
    grid-template-rows: repeat(4, 1fr);
}

.grid-3, .grid-4, .grid-5 {
    display: none;
}

.card {
    width: 100px;
    height: 100px;
    background-color: #7e57c2;
    border-radius: 5px;
    cursor: pointer;
    transition: transform 0.3s ease;
    position: relative;
}

.card svg {
    width: 60px;
    height: 60px;
    position: absolute;
    top: 50%;
    left: 50%;
    transform: translate(-50%, -50%);
    opacity: 0;
    transition: opacity 0.3s ease;
}

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

.card.flipped svg {
    opacity: 1;
}

.card.matched {
    background-color: #81c784;
}

.stats {
    margin-top: 20px;
    font-size: 1.2em;
    color: #333;
}

.level-select {
    margin-bottom: 20px;
}

.level-select button {
    padding: 8px 16px;
    margin: 0 5px;
    font-size: 1em;
    cursor: pointer;
    background-color: #7e57c2;
    color: white;
    border: none;
    border-radius: 5px;
    transition: background-color 0.3s ease;
}

.level-select button:hover {
    background-color: #6a4caf;
}

.level-select button.active {
    background-color: #4a338a;
}