* {
    margin: 0;
    padding: 0;
    box-sizing: border-box;
    font-family: -apple-system, BlinkMacSystemFont, 'Segoe UI', Roboto, Oxygen, Ubuntu, Cantarell, 'Open Sans', 'Helvetica Neue', sans-serif;
}

body {
    background-color: #f0f2f5;
    color: #333;
}

.container {
    max-width: 600px;
    margin: 0 auto;
    padding: 20px;
}

.game-header {
    text-align: center;
    margin-bottom: 30px;
}

.stats {
    display: flex;
    justify-content: space-around;
    margin-top: 20px;
    background-color: white;
    padding: 15px;
    border-radius: 10px;
    box-shadow: 0 2px 4px rgba(0,0,0,0.1);
}

.click-area {
    text-align: center;
    margin: 30px 0;
}

#click-button {
    background-color: #0088cc;
    color: white;
    border: none;
    padding: 20px 40px;
    font-size: 24px;
    border-radius: 50px;
    cursor: pointer;
    transition: transform 0.1s;
    box-shadow: 0 4px 6px rgba(0,0,0,0.1);
}

#click-button:active {
    transform: scale(0.95);
}

.upgrades {
    background-color: white;
    padding: 20px;
    border-radius: 10px;
    box-shadow: 0 2px 4px rgba(0,0,0,0.1);
}

.upgrade-list {
    display: flex;
    flex-direction: column;
    gap: 20px;
    margin-top: 20px;
}

.upgrade-item {
    background-color: #f8f9fa;
    padding: 15px;
    border-radius: 8px;
    border: 1px solid #e9ecef;
}

.upgrade-item h3 {
    margin-bottom: 10px;
}

.upgrade-item p {
    margin: 5px 0;
}

.upgrade-item button {
    background-color: #28a745;
    color: white;
    border: none;
    padding: 8px 16px;
    border-radius: 4px;
    cursor: pointer;
    margin-top: 10px;
}

.upgrade-item button:disabled {
    background-color: #6c757d;
    cursor: not-allowed;
}