body {
    font-family: Arial, sans-serif;
    background-color: #f0f0f0;
    margin: 0;
    padding: 20px;
}

.container {
    max-width: 800px;
    margin: 0 auto;
    background-color: white;
    padding: 20px;
    border-radius: 10px;
    box-shadow: 0 0 10px rgba(0,0,0,0.1);
}

h1 {
    text-align: center;
    color: #333;
}

#game-area {
    display: flex;
    flex-direction: column;
    gap: 20px;
}

#computer-hand, #play-area, #player-hand {
    border: 1px solid #ddd;
    padding: 10px;
    border-radius: 5px;
}

.cards {
    display: flex;
    flex-wrap: wrap;
    gap: 10px;
}

.card {
    width: 50px;
    height: 75px;
    background-color: white;
    border: 1px solid #999;
    border-radius: 5px;
    display: flex;
    justify-content: center;
    align-items: center;
    font-weight: bold;
    cursor: pointer;
}

.card.selected {
    background-color: #e0e0e0;
}

#controls {
    display: flex;
    justify-content: center;
    gap: 10px;
    margin-top: 20px;
}

button {
    padding: 10px 20px;
    font-size: 16px;
    cursor: pointer;
}

#message {
    text-align: center;
    margin-top: 20px;
    font-weight: bold;
}