.date-range-popover {
  display: none;
  position: fixed;
  top: 0;
  left: 0;
  min-width: 260px;
  background: #0c0e18;
  border: 1px solid rgba(255,255,255,0.12);
  border-radius: 12px;
  box-shadow: 0 12px 36px rgba(0,0,0,0.55);
  padding: 10px;
  z-index: 99999;
}
.date-range-popover.open { display: block; }