.flatpickr-day.kcc-weekend{
  opacity: .35;
  filter: grayscale(1);
  cursor: not-allowed !important;
  pointer-events: none !important;
}
.flatpickr-day.kcc-unavailable,
.flatpickr-day.flatpickr-disabled{
  filter: grayscale(1);
  cursor: not-allowed !important;
}
.flatpickr-day.inRange{
  background: rgba(220, 38, 38, 0.18) !important;
  border-color: transparent !important;
  box-shadow: none !important;
  color: #d80d07 !important;
}
.flatpickr-day.startRange,
.flatpickr-day.endRange,
.flatpickr-day.selected{
  background: #d80d07 !important;
  color: #fff !important;
  border-color: #d80d07 !important;
}
.flatpickr-day{ border-radius: 6px !important; }

.flatpickr-day.endRange.startRange+.endRange:not(:nth-child(7n+1)),
.flatpickr-day.selected.startRange+.endRange:not(:nth-child(7n+1)),
.flatpickr-day.startRange.startRange+.endRange:not(:nth-child(7n+1)){
  box-shadow: -10px 0 0 rgba(220, 38, 38, 0.18) !important;
}