.memory-game {
    display: grid;
    grid-template-columns: repeat(4, 1fr);
    gap: 10px;
    max-width: 600px;
    margin: auto;
}

.memory-card {
    width: 100%;
    aspect-ratio: 1;
    background-color: #f3f3f3;
    border-radius: 10px;
    cursor: pointer;
    display: flex;
    justify-content: center;
    align-items: center;
    font-size: 2em;
    transition: transform 0.3s ease;
}

.memory-card.flip {
    transform: rotateY(180deg);
    background-color: #fff;
    border: 2px solid #4CAF50;
}

#result {
    text-align: center;
    margin: 20px 0;
    font-size: 1.5em;
}

#timer {
    font-size: 1.2em;
    margin-bottom: 20px;
}

#new-game-btn {
    display: block;
    margin: 20px auto;
    padding: 10px 20px;
    font-size: 1.2em;
    background-color: #4CAF50;
    color: white;
    border: none;
    border-radius: 5px;
    cursor: pointer;
}

#new-game-btn:hover {
    background-color: #45a049;
}

#ranking-list {
    margin-top: 20px;
    font-size: 1.2em;
}

#player-name-section {
    margin-bottom: 20px;
}

#player-name {
    padding: 5px;
    font-size: 1em;
    border-radius: 5px;
    border: 1px solid #ccc;
}