naive-ui/styles/themes/dark/components/Breadcrumb.scss

@mixin setup-dark-breadcrumb {
  $--breadcrumb-link-text-color: (
    'default': $--neutral-4,
    'active': $--n-text-color,
    'hover': $--primary-6
  ) !global;
  $--breadcrumb-seperator-text-color: (
    'default': $--n-secondary-text-color
  ) !global;
}