/* ===== Overlay Readability (Opacity & Line-height) ===== */
/* Base: apply CSS variables with safe defaults */
#routeOverlay {
  /* overall opacity */
  opacity: var(--ro-opacity, 1);
  /* background alpha: blend with base background color */
  background: rgba(0,0,0, var(--ro-bg-alpha, 0.62));
}
/* line-height for all overlay texts */
#routeOverlay, #routeOverlay * {
  line-height: var(--ro-line-height, 1.10);
}