@layer layout {
  .sb-shell { display: grid; grid-template-columns: var(--sb-sidebar) minmax(0, 1fr); min-block-size: 100dvh; }
  .sb-shell[data-sidebar="collapsed"] { grid-template-columns: var(--sb-rail) minmax(0, 1fr); }

  .sb-sidebar {
    position: sticky;
    inset-block-start: 0;
    block-size: 100dvh;
    display: flex;
    flex-direction: column;
    gap: var(--sb-space-1);
    padding: var(--sb-space-4) var(--sb-space-3);
    border-inline-end: 1px solid var(--sb-border);
    background: var(--sb-surface);
    overflow-y: auto;
  }

  /* Official logo (components.css .sb-logo): lockup ~30px tall when the sidebar is expanded, the mark (32px) on the rail.
     Clear space comes from the padding; the logo is never mirrored in RTL. */
  .sb-brand {
    display: flex;
    align-items: center;
    min-block-size: 44px;
    padding: var(--sb-space-2) var(--sb-space-3) var(--sb-space-5);
    border-radius: var(--sb-radius-md);
  }
  .sb-brand__lockup { --sb-logo-h: 28px; }
  .sb-brand__mark { --sb-logo-h: 32px; display: none; }
  .sb-print-brand { display: none; }

  .sb-nav { display: flex; flex-direction: column; gap: var(--sb-space-1); }
  .sb-nav__item {
    position: relative;
    display: flex;
    align-items: center;
    gap: var(--sb-space-3);
    inline-size: 100%;
    min-block-size: 44px;
    padding: var(--sb-space-2) var(--sb-space-3);
    border-radius: var(--sb-radius-md);
    color: var(--sb-ink-2);
    font-weight: 600;
    text-align: start;
    transition: background-color var(--sb-dur-fast) var(--sb-ease), color var(--sb-dur-fast) var(--sb-ease);
  }
  .sb-nav__item:hover { background: var(--sb-hover); color: var(--sb-ink); }
  .sb-nav__item[aria-current="page"] { background: var(--sb-teal-strong); color: var(--sb-on-accent); }
  .sb-nav__badge { margin-inline-start: auto; }
  .sb-sidebar__foot { margin-block-start: auto; display: flex; flex-direction: column; gap: var(--sb-space-1); }

  .sb-shell[data-sidebar="collapsed"] .sb-sidebar .sb-brand__lockup { display: none; }
  .sb-shell[data-sidebar="collapsed"] .sb-sidebar .sb-brand__mark { display: inline-flex; }
  .sb-shell[data-sidebar="collapsed"] .sb-nav__label {
    position: absolute; inline-size: 1px; block-size: 1px; overflow: hidden; clip-path: inset(50%); white-space: nowrap;
  }
  .sb-shell[data-sidebar="collapsed"] :is(.sb-nav__item, .sb-brand) { justify-content: center; padding-inline: 0; }
  .sb-shell[data-sidebar="collapsed"] .sb-nav__badge { position: absolute; inset-block-start: 2px; inset-inline-end: 6px; }
  .sb-shell[data-sidebar="collapsed"] .sb-sidebar__toggle .sb-icon { scale: -1 1; }

  .sb-main { min-inline-size: 0; display: flex; flex-direction: column; }

  .sb-topbar {
    position: sticky;
    inset-block-start: 0;
    z-index: 20;
    display: flex;
    align-items: center;
    gap: var(--sb-space-3);
    min-block-size: var(--sb-topbar);
    padding-inline: var(--sb-gutter);
    border-block-end: 1px solid var(--sb-border);
    background: var(--sb-surface);
  }
  .sb-topbar__spacer { flex: 1; }
  .sb-topbar__brand { display: none; }

  .sb-breadcrumbs ol { display: flex; flex-wrap: wrap; align-items: center; gap: var(--sb-space-2); padding: 0; list-style: none; font-size: var(--sb-fs-sm); color: var(--sb-ink-2); }
  .sb-breadcrumbs li + li::before { content: "/"; margin-inline-end: var(--sb-space-2); color: var(--sb-ink-2); }
  .sb-breadcrumbs a:hover { color: var(--sb-ink); }
  .sb-breadcrumbs [aria-current="page"] { color: var(--sb-ink); font-weight: 600; }

  .sb-content {
    inline-size: 100%;
    max-inline-size: var(--sb-content-max);
    margin-inline: auto;
    padding: var(--sb-space-6) var(--sb-gutter) var(--sb-space-12);
    display: flex;
    flex-direction: column;
    gap: var(--sb-space-6);
  }

  .sb-tabbar { display: none; }

  .sb-focus { min-block-size: 100dvh; display: flex; flex-direction: column; }
  .sb-focus__bar {
    position: sticky;
    inset-block-start: var(--sb-space-3);
    z-index: 20;
    margin: var(--sb-space-3);
    display: flex;
    align-items: center;
    gap: var(--sb-space-3);
    padding: var(--sb-space-3) var(--sb-space-4);
    border: 1px solid var(--sb-border);
    border-radius: var(--sb-radius-lg);
    background: var(--sb-surface);
  }
  .sb-focus__logo { --sb-logo-h: 28px; }
  .sb-focus__body { flex: 1; inline-size: 100%; max-inline-size: var(--sb-content-max); margin-inline: auto; padding: 0 var(--sb-space-3) var(--sb-space-6); }

  @media (max-width: 1279.98px) {
    .sb-shell { grid-template-columns: var(--sb-rail) minmax(0, 1fr); }
    .sb-sidebar .sb-brand__lockup { display: none; }
    .sb-sidebar .sb-brand__mark { display: inline-flex; }
    .sb-shell .sb-nav__label {
      position: absolute; inline-size: 1px; block-size: 1px; overflow: hidden; clip-path: inset(50%); white-space: nowrap;
    }
    .sb-shell :is(.sb-nav__item, .sb-brand) { justify-content: center; padding-inline: 0; }
    .sb-shell .sb-nav__badge { position: absolute; inset-block-start: 2px; inset-inline-end: 6px; }
    .sb-sidebar__toggle { display: none; }
  }

  @media (max-width: 767.98px) {
    .sb-shell, .sb-shell[data-sidebar="collapsed"] { grid-template-columns: minmax(0, 1fr); }
    .sb-sidebar, .sb-breadcrumbs { display: none; }
    .sb-topbar__brand { display: flex; padding: var(--sb-space-1); }
    /* Phone top bar: the mark with the name (the name is short enough for 320px). */
    .sb-topbar__brand .sb-brand__lockup { --sb-logo-h: 26px; display: inline-flex; }
    .sb-topbar__brand .sb-brand__mark { display: none; }
    .sb-content { padding-block-end: calc(var(--sb-tabbar) + var(--sb-space-8) + env(safe-area-inset-bottom)); }
    .sb-tabbar {
      position: fixed;
      inset-inline: 0;
      inset-block-end: 0;
      z-index: 30;
      display: grid;
      grid-template-columns: repeat(5, 1fr);
      padding-block-end: env(safe-area-inset-bottom);
      border-block-start: 1px solid var(--sb-border);
      background: var(--sb-surface);
    }
    .sb-tabbar__item {
      position: relative;
      display: flex;
      flex-direction: column;
      align-items: center;
      justify-content: center;
      gap: 2px;
      min-block-size: var(--sb-tabbar);
      font-size: var(--sb-fs-xs);
      font-weight: 600;
      color: var(--sb-ink-2);
    }
    .sb-tabbar__item[aria-current="page"] { color: var(--sb-teal-ink); }
    .sb-tabbar__badge { position: absolute; inset-block-start: 6px; inset-inline-start: calc(50% + 4px); }
  }

}