Breadcrumb

A 13px muted trail; the current page sits in foreground at regular weight, not bold — the page's own h1 carries the title. Collapse anything beyond four levels into an ellipsis that opens a dropdown of the hidden ones.

<Breadcrumb>
  <BreadcrumbList>
    <BreadcrumbItem><BreadcrumbLink href="/lots">Our lots</BreadcrumbLink></BreadcrumbItem>
    <BreadcrumbSeparator />
    <BreadcrumbItem><BreadcrumbPage>Shampoo 400 ml, 24 pallets</BreadcrumbPage></BreadcrumbItem>
  </BreadcrumbList>
</Breadcrumb>

Three levels

Seller side: the lot list down to one lot.

Collapsed

Buyer side, deep in the taxonomy: levels beyond four fold into an ellipsis; opening it lists the hidden categories.

Custom separator

Order trail with a slash in place of the chevron.