/* The page-progress bar (``static/js/page_progress.js``): a 3px line along
   the top edge of the window, over the product bar (or a kiosk's screen), while the next page or
   a requested panel is on its way. Grows by ``transform`` alone so it never
   reflows the page; fades once the answer arrives. */
.nstx-page-progress {
    position: fixed;
    top: 0;
    left: 0;
    z-index: 1000;
    width: 100%;
    height: 3px;
    background: var(--m-accent, #333b44);
    box-shadow: 0 0 6px rgba(51, 59, 68, 0.35);
    transform: scaleX(0);
    transform-origin: left center;
    opacity: 0;
    pointer-events: none;
    transition: transform 250ms ease-out, opacity 200ms ease;
}

.nstx-page-progress.is-active {
    opacity: 1;
}

.nstx-page-progress.is-done {
    opacity: 0;
    transition: transform 150ms ease-out, opacity 250ms ease 100ms;
}

/* A kiosk or tablet screen can be dark or light: the action green with a
   pale edge reads on either. */
.kiosk-body .nstx-page-progress {
    background: var(--kiosk-green, #2f6b46);
    box-shadow: 0 0 0 1px rgba(255, 255, 255, 0.55);
}

@media (prefers-reduced-motion: reduce) {
    .nstx-page-progress {
        transition: opacity 200ms ease;
    }
}