body {
    display: flex;
    justify-content: center;
    align-items: center;
    height: 100vh;
    margin: 0;
    font-family: Arial, sans-serif;
    transition: background-color 0.3s, color 0.3s;
}

body.light {
    background-color: #f0f0f0;
    color: #333;
}

body.dark {
    background-color: #333;
    color: #f0f0f0;
}

.game-container {
    text-align: center;
    background-color: #fff;
    padding: 20px;
    border-radius: 10px;
    box-shadow: 0 4px 8px rgba(0, 0, 0, 0.1);
}

body.dark .game-container {
    background-color: #444;
}

#cat-img {
    width: 300px;
    height: auto;
    cursor: pointer;
    border-radius: 10px;
    transition: transform 0.1s, box-shadow 0.1s;
}

#cat-img:active {
    transform: scale(0.95);
    box-shadow: 0 2px 4px rgba(0, 0, 0, 0.2);
}

.score {
    font-size: 24px;
    margin-bottom: 20px;
}

.shop {
    margin-top: 20px;
}

.shop h2 {
    font-size: 20px;
    margin-bottom: 10px;
}

.item {
    font-size: 18px;
    margin: 10px 0;
    cursor: pointer;
    padding: 10px;
    background-color: #fafafa;
    border: 1px solid #ccc;
    border-radius: 5px;
    transition: background-color 0.3s, border-color 0.3s;
}

body.dark .item {
    background-color: #555;
    border-color: #777;
}

.item:hover {
    background-color: #e0e0e0;
    border-color: #bbb;
}

body.dark .item:hover {
    background-color: #666;
    border-color: #888;
}

button {
    margin-top: 20px;
    padding: 10px 20px;
    font-size: 16px;
    cursor: pointer;
    border: none;
    border-radius: 5px;
    transition: background-color 0.3s, color 0.3s;
}

button:hover {
    background-color: #ddd;
}

body.dark button {
    background-color: #555;
    color: #f0f0f0;
}

body.dark button:hover {
    background-color: #666;
}