body {
    font-family: 'Arial', sans-serif;
    display: flex;
    flex-direction: column;
    align-items: center;
    justify-content: center;
    height: 100vh;
    margin: 0;
    background-color: #f0f8ff;
}

h1 {
    color: #0056b3;
    margin-bottom: 20px;
}

.info-panel {
    font-size: 24px;
    margin-bottom: 20px;
    text-align: center;
}

#game-status {
    font-size: 18px;
    color: #666;
    margin-top: 10px;
}

.game-container {
    display: grid;
    grid-template-columns: repeat(2, 1fr);
    gap: 20px;
    margin-bottom: 30px;
}

.car-button {
    width: 120px;
    height: 120px;
    border-radius: 50%; /* 圓形按鈕 */
    display: flex;
    align-items: center;
    justify-content: center;
    font-size: 60px;
    cursor: pointer;
    border: 5px solid #333;
    transition: background-color 0.2s, transform 0.2s, opacity 0.3s;
}

.car-button.disabled {
    opacity: 0.3;
    cursor: not-allowed;
    filter: grayscale(100%);
    border-color: #999;
}

.car-button.red { background-color: #ff4d4d; }
.car-button.blue { background-color: #4d94ff; }
.car-button.green { background-color: #4dff4d; }
.car-button.yellow { background-color: #ffff4d; }

.car-button.lit {
    background-color: #fff;
    transform: scale(1.1);
    box-shadow: 0 0 20px #fff;
}

.button-container {
    display: flex;
    gap: 10px;
    margin-bottom: 10px;
}

#start-button, #restart-button, .back-button {
    padding: 12px 25px;
    font-size: 18px;
    border-radius: 8px;
    border: 2px solid #0056b3;
    cursor: pointer;
    background-color: #fff;
    color: #0056b3;
    font-weight: bold;
    text-decoration: none;
    margin-top: 10px;
    transition: background-color 0.3s, color 0.3s;
}

#start-button:hover, #restart-button:hover, .back-button:hover {
    background-color: #0056b3;
    color: #fff;
}