{% extends "brickwork/shell/base.html" %}
{% comment %}
The centred shell (SHL-011/013): a generic centred single-panel layout for
anything that is neither the app shell nor an auth page (a standalone
confirmation, an empty state, an error page). A "full-bleed no-chrome" need is
served by an essentially-empty content block here, not a distinct fourth shell
(SHL-013). Fully static (no JS required).

States: none of its own; it is a static panel with no interactive markup.
Accessibility: inherits the skip link and lang/dir/theme attributes from
  base.html. Its own contribution is <main id="bw-main" tabindex="-1"> as
  the panel body, and the same themed bare-prose-link colour
  (.bw-centred__panel :where(a)) the auth shell carries. Covered by the
  archetype harness and axe.spec.mjs against confirm-*.html (this shell is
  app/confirm.html's own shell), both themes.
Responsive: no breakpoint switch. Shares the auth shell's grid: a single
  centred column, the panel fluid at min(28rem, 100%), capped at the
  available inline space at every viewport width.
{% endcomment %}
{% block shell_variant %}centred{% endblock %}

{% block shell %}
<div class="bw-centred">
  <main id="bw-main" class="bw-centred__panel" tabindex="-1">
    {% block content %}{% endblock %}
  </main>
</div>
{% endblock %}