#shutdownModal {
    display: none; /* ค่าเริ่มต้น */
    position: fixed;
    z-index: 99999;
    top: 0;
    left: 0;
    width: 100vw;
    height: 100vh;
    background: rgba(0,0,0,0.45);
    justify-content: center;
    align-items: center;
    overflow: hidden;
}

.modal-content {
    background: #fff;
    padding: 40px 60px;
    border-radius: 16px;
    box-shadow: 0 2px 16px #0003;
    display: flex;
    flex-direction: column;
    align-items: center;
    gap: 24px;
    max-width: 50%;
    width: 100%;
    max-height: 90vh;
    overflow-y: auto;
}

.shutdown-title {
    font-size: 2.2rem;
    font-weight: 700;
    color: #d32f2f;
    text-align: center;
}

#shutdownCountdown {
    font-size: 2.5rem;
    font-weight: 600;
    color: #333;
    text-align: center;
}

#shutdownOpenDate {
    font-size: 1.2rem;
    color: #1976d2;
    text-align: center;
    margin-top: 8px;
}

.contact-info {
    font-size: 1.1rem;
    color: #666;
    text-align: center;
}

/* Tablet (600px - 1024px) */
@media (min-width: 601px) and (max-width: 1024px) {
    #shutdownModal {
        display: none;
    }

    .modal-content {
        background: #fff;
        padding: 30px 40px;
        border-radius: 14px;
        box-shadow: 0 2px 16px #0003;
        display: flex;
        flex-direction: column;
        align-items: center;
        gap: 20px;
        max-width: 95%;
        width: 100%;
        max-height: 90vh;
        overflow-y: auto;
    }

    .shutdown-title {
        font-size: clamp(1.8rem, 4vw, 2rem);
        font-weight: 700;
        color: #d32f2f;
        text-align: center;
    }

    #shutdownCountdown {
        font-size: clamp(2rem, 5vw, 2.2rem);
        font-weight: 600;
        color: #333;
        text-align: center;
    }

    #shutdownOpenDate {
        font-size: clamp(1rem, 3vw, 1.1rem);
        color: #1976d2;
        text-align: center;
        margin-top: 6px;
    }

    .contact-info {
        font-size: clamp(0.9rem, 2.5vw, 1rem);
        color: #666;
        text-align: center;
    }
}

/* Mobile (≤600px) */
@media (max-width: 600px) {
    #shutdownModal {
        display: none;
    }

    .modal-content {
        background: #fff;
        padding: 20px 30px;
        border-radius: 12px;
        box-shadow: 0 2px 16px #0003;
        display: flex;
        flex-direction: column;
        align-items: center;
        gap: 16px;
        max-width: 95%;
        width: 100%;
        max-height: 90vh;
        overflow-y: auto;
    }

    .shutdown-title {
        font-size: clamp(1.4rem, 4.5vw, 1.8rem);
        font-weight: 700;
        color: #d32f2f;
        text-align: center;
    }

    #shutdownCountdown {
        font-size: clamp(1.6rem, 5vw, 2rem);
        font-weight: 600;
        color: #333;
        text-align: center;
    }

    #shutdownOpenDate {
        font-size: clamp(0.8rem, 3.5vw, 1rem);
        color: #1976d2;
        text-align: center;
        margin-top: 6px;
    }

    .contact-info {
        font-size: clamp(0.8rem, 3vw, 0.9rem);
        color: #666;
        text-align: center;
    }
}