Icons

helpers/icons.css: custom SVGs as CSS mask-image (currentColor-capable, scales with font-size, no markup content needed).

Classes

.ncss-icon + .ncss-icon-close/-chevron-down/-menu/-play/-search.

<span class="ncss-icon ncss-icon-close" aria-hidden="true"></span>

Swappable

Swappable for e.g. Font Awesome (<i class="fa-solid fa-xmark">) without touching the consuming component - components like .ncss-dialog-close only style the surface, never the icon source.