#countdown-container {
    font-family: Arial, sans-serif;
    text-align: left;
    font-size: 16px;
    font-weight: bold;
    padding: 5px;
    display: flex;
    flex-direction: column;
    justify-content: flex-start;
}

#countdown {
    padding: 0;
    border-radius: 5px;
    display: flex;
    justify-content: flex-start;
    gap: 5px;
    flex-wrap: wrap;
}

.countdown-item {
    text-align: center;
    width: 70px;
    height: 60px;
    border: 1px solid #a8a8a8;
    border-radius: 5px;
    display: flex;
    flex-direction: column;
    justify-content: center;
    align-items: center;
    box-shadow: none;
}

.datetime-value {
    font-size: 20px;
    color: #333;
    background-color: #f5f5f5;
    border-top-left-radius: 5px;
    border-top-right-radius: 5px;
    padding: 0;
    margin-bottom: 0;
    width: 100%;
    height: 100%;
    display: inline-block;
    box-sizing: border-box;
}

.datetime-unit {
    font-size: 12px;
    color: #333;
    margin-top: 0;
    background-color: #fff;
    border-bottom-left-radius: 5px;
    border-bottom-right-radius: 5px;
    padding: 0;
    width: 100%;
    height: 100%;
    display: inline-block;
    box-sizing: border-box;
}

#countdown-container .title {
    font-size: 12px;
    font-weight: normal;
    text-align: left;
    margin-bottom: 5px;
}

#message {
    margin-top: 20px;
    display: none;
    font-size: 16px;
    font-weight: bold;
    color: #333;
}

@media screen and (max-width: 768px) {
    .countdown-item {
        width: 60px;
        height: 60px;
        display: flex;
        flex-direction: column;
        justify-content: center;
        align-items: center;
    }

    .datetime-value {
        font-size: 16px;
        display: block;
    }

    .datetime-unit {
        font-size: 10px;
        display: block;
    }
}

@media screen and (max-width: 480px) {
    .countdown-item {
        width: 50px;
        height: 50px;
        display: flex;
        flex-direction: column;
        justify-content: center;
        align-items: center;
    }

    .datetime-value {
        font-size: 15px;
        display: block;
    }

    .datetime-unit {
        font-size: 10px;
        display: block;
    }
}