/**
 * Post-send cooldown: buttons must look clearly inactive (grey) and stay unclickable.
 * Applied via JS class `sms-send-cooldown-lock` together with the disabled attribute.
 */
button.sms-send-cooldown-lock:disabled,
button.sms-send-cooldown-lock[disabled],
a.btn.sms-send-cooldown-lock.disabled {
    cursor: not-allowed !important;
    pointer-events: none;
    opacity: 1 !important;
    background-color: var(--bs-secondary, #6c757d) !important;
    border-color: var(--bs-secondary, #6c757d) !important;
    color: #fff !important;
    box-shadow: none !important;
}