サイドバー

<%# Markup for the sidebar (collapsible sidebar) demo.
    This demo focuses on the INLINE rail: the toggle collapses / expands it and the
    preference persists in localStorage across reloads. (The same sidebar can also
    switch to a modal off-canvas panel below a breakpoint — that document-level modal
    mode is described in the text and is the same off-canvas pattern the Drawer demo
    shows; it is not staged here because a page-level modal inside a catalog card reads
    as taking over the page.) breakpoint=0 keeps this demo always inline. The library
    syncs aria-expanded, data-mode, and data-state; the rail width / animation are
    demo.css's. role="dialog" is intentionally not applied — the panel stays a nav. %>
<div
  class="sidebar-demo"
  data-controller="stimeo--sidebar"
  data-stimeo--sidebar-breakpoint-value="0"
  data-stimeo--sidebar-key-value="catalog-demo">
  <div class="sidebar-demo__bar">
    <button
      type="button"
      class="sidebar-demo__toggle"
      data-stimeo--sidebar-target="trigger"
      data-action="click->stimeo--sidebar#toggle"
      aria-expanded="true"
      aria-controls="sidebar-demo-panel">
      <%= t("components.sidebar.demo.toggle") %>
    </button>
    <span class="sidebar-demo__brand"><%= t("components.sidebar.demo.brand") %></span>
  </div>

  <div class="sidebar-demo__body">
    <nav
      id="sidebar-demo-panel"
      class="sidebar-demo__panel"
      data-stimeo--sidebar-target="panel"
      aria-label="<%= t('components.sidebar.demo.nav_label') %>"
      data-mode="inline"
      data-state="expanded">
      <% t("components.sidebar.demo.items").each do |label| %>
        <a class="sidebar-demo__link" href="#"><%= label %></a>
      <% end %>
    </nav>

    <main class="sidebar-demo__content">
      <p><%= t("components.sidebar.demo.hint") %></p>
    </main>
  </div>
</div>

/*
 * Presentation-only styles for the sidebar demo (inline rail).
 * Stimeo ships behavior only: the library syncs aria-expanded, data-mode, and
 * data-state (expanded/collapsed). This demo shows the inline rail — the toggle
 * animates the rail's width via data-state. (The overlay/modal off-canvas mode the
 * component also supports is described in the text, not staged here; see the Drawer
 * demo for the same off-canvas pattern.)
 */

.sidebar-demo {
  overflow: hidden;
  border: 1px solid var(--border-strong);
  border-radius: 0.5rem;
  background: var(--surface-card);
}

.sidebar-demo__bar {
  display: flex;
  align-items: center;
  gap: 0.75rem;
  padding: 0.6rem 0.9rem;
  border-bottom: 1px solid var(--border-default);
  background: var(--surface-subtle);
}

.sidebar-demo__toggle {
  padding: 0.35rem 0.7rem;
  font: inherit;
  cursor: pointer;
  border: 1px solid var(--border-interactive);
  border-radius: 0.375rem;
  background: var(--surface-card);
}

.sidebar-demo__brand {
  font-weight: 600;
  color: var(--color-text);
}

.sidebar-demo__body {
  display: flex;
  min-height: 12rem;
}

/* Panel: a rail whose width follows data-state. */
.sidebar-demo__panel {
  display: flex;
  flex-direction: column;
  gap: 0.25rem;
  width: 12rem;
  padding: 0.75rem;
  border-right: 1px solid var(--border-default);
  background: var(--surface-card);
  overflow: hidden;
  transition: width 0.2s ease, padding 0.2s ease;
}

.sidebar-demo__panel[data-state="collapsed"] {
  width: 0;
  padding-inline: 0;
  border-right-color: transparent;
}

/* Fully collapsed: hide the links so they leave the tab order too (a width:0 +
   overflow:hidden rail would still keep them keyboard-focusable but invisible). */
.sidebar-demo__panel[data-state="collapsed"] .sidebar-demo__link {
  display: none;
}

.sidebar-demo__link {
  white-space: nowrap;
  padding: 0.4rem 0.5rem;
  border-radius: 0.375rem;
  color: var(--color-text);
  text-decoration: none;
}

.sidebar-demo__link:hover {
  background: var(--surface-subtle);
}

.sidebar-demo__link:focus-visible {
  outline: 2px solid var(--color-primary-hover);
  outline-offset: 2px;
}

.sidebar-demo__content {
  flex: 1;
  padding: 1rem;
  color: var(--color-text-muted);
}

@media (prefers-reduced-motion: reduce) {
  .sidebar-demo__panel {
    transition: none;
  }
}