/**
 * Application shell — sidebar + main content
 * @see docs/ui-redesign/migration-plan.md steps 2–4
 */

html {
  box-sizing: border-box;
}

*,
*::before,
*::after {
  box-sizing: inherit;
}

body.app-body {
  margin: 0;
  min-height: 100vh;
  font-family: var(--font-family-sans);
  font-size: var(--font-size-base);
  line-height: var(--line-height-base);
  color: var(--color-text-primary);
  background: var(--color-surface-page);
  -webkit-font-smoothing: antialiased;
}

body.app-body .app-main__content a {
  color: var(--color-link);
}

body.app-body .app-main__content a:hover,
body.app-body .app-main__content a:focus-visible {
  color: #1e40af;
}

.app-shell {
  display: flex;
  min-height: 100vh;
}

.app-main {
  flex: 1 1 auto;
  min-width: 0;
  display: flex;
  flex-direction: column;
  background: var(--color-surface-page);
}

.app-main__content {
  flex: 1 1 auto;
  padding: var(--space-6) var(--layout-page-margin) var(--layout-page-margin);
}

.app-main__content > .container {
  width: 100%;
  max-width: 100%;
  padding: 0;
  margin: 0;
}

/* Logged-out pages (login) */
.app-main--standalone {
  width: 100%;
}

.app-main--standalone .app-main__content {
  max-width: 100%;
}

/* Sidebar */
.ui-sidebar {
  flex: 0 0 var(--sidebar-width);
  width: var(--sidebar-width);
  min-height: 100vh;
  display: flex;
  flex-direction: column;
  background: var(--color-sidebar-bg);
  color: var(--color-sidebar-text);
  border-right: 1px solid #1e293b;
  z-index: var(--z-sidebar);
}

.ui-sidebar__brand {
  flex: 0 0 auto;
  padding: var(--space-4) var(--space-4) var(--space-3);
  border-bottom: 1px solid #1e293b;
}

.ui-sidebar__logo {
  display: inline-flex;
  align-items: center;
  text-decoration: none;
  font-size: 1.625rem;
  font-weight: var(--font-weight-bold);
  color: var(--color-sidebar-text-active);
  line-height: var(--line-height-tight);
  letter-spacing: -0.02em;
}

.ui-sidebar__logo span {
  color: #f87171;
}

.ui-sidebar__nav {
  flex: 1 1 auto;
  overflow-y: auto;
  padding: var(--space-3) 0;
}

.ui-sidebar__footer {
  flex: 0 0 auto;
  display: flex;
  flex-direction: column;
  gap: var(--space-2);
  padding: var(--space-3) var(--space-2);
  border-top: 1px solid #1e293b;
}

.ui-sidebar__user {
  display: flex;
  align-items: center;
  gap: var(--space-3);
  margin: 0;
  padding: var(--space-2) var(--space-4);
  font-size: var(--sidebar-subnav-font-size);
  font-weight: var(--font-weight-medium);
  color: var(--color-sidebar-text-active);
  line-height: var(--line-height-tight);
}

.ui-sidebar__user .app-nav-icon {
  opacity: 0.85;
}

/* Top bar — Stitch TopAppBar: search left, actions right */
.ui-topbar {
  position: sticky;
  top: 0;
  z-index: var(--z-topbar);
  display: flex;
  align-items: center;
  gap: var(--space-4);
  min-height: var(--topbar-height);
  padding: var(--space-3) var(--layout-page-margin);
  background: var(--color-surface-card);
  border-bottom: 1px solid var(--color-border);
}

.ui-topbar__search {
  flex: 1 1 auto;
  min-width: 16rem;
  max-width: min(52rem, 58vw);
}

.ui-topbar__title {
  flex: 1 1 auto;
  min-width: 0;
  display: flex;
  flex-direction: column;
  justify-content: center;
  gap: 0.1rem;
}

.ui-topbar__title-text {
  margin: 0;
  font-size: var(--font-size-md);
  font-weight: var(--font-weight-semibold);
  line-height: 1.2;
  color: var(--color-text-primary);
}

.ui-topbar__title-meta {
  margin: 0;
  font-size: var(--font-size-xs);
  line-height: 1.25;
  color: var(--color-text-secondary);
  white-space: nowrap;
  overflow: hidden;
  text-overflow: ellipsis;
}

.ui-topbar__actions {
  flex: 0 0 auto;
  margin-left: auto;
  display: flex;
  align-items: center;
  justify-content: flex-end;
  gap: var(--space-2);
}

/* Informationsboard-Glocke (Element ui/infoboard_bell): nur sichtbar mit
   Modulrecht; rot, sobald der Nutzer selbst @-erwähnt wurde. */
.ui-topbar__bell {
  position: relative;
  flex: 0 0 auto;
  margin-left: auto;
  display: inline-flex;
  align-items: center;
  justify-content: center;
  width: 2.25rem;
  height: 2.25rem;
  border-radius: 50%;
  color: var(--color-text-secondary, #64748b);
}
.ui-topbar__actions + .ui-topbar__bell { margin-left: 0; }
.ui-topbar__bell:hover { background: var(--color-neutral-bg, #f1f5f9); }
.ui-topbar__bell-count {
  position: absolute;
  top: -0.2rem;
  right: -0.25rem;
  min-width: 1.15rem;
  height: 1.15rem;
  padding: 0 0.25rem;
  display: inline-flex;
  align-items: center;
  justify-content: center;
  border-radius: 999px;
  background: var(--color-info, #2563eb);
  color: #fff;
  font-size: 0.68rem;
  font-weight: 700;
  font-variant-numeric: tabular-nums;
}
.ui-topbar__bell-count[hidden] { display: none; }
.ui-topbar__bell--mention .ui-topbar__bell-count { background: var(--color-danger, #dc2626); }
.ui-topbar__bell--mention { color: var(--color-danger, #dc2626); }

.ui-topbar-search {
  display: flex;
  align-items: center;
  gap: 0.75rem;
  width: 100%;
  min-height: var(--form-control-height);
  padding: 0 var(--space-3);
  background: var(--color-surface-page);
  border-radius: var(--radius-sm);
}

.ui-topbar-search__leading {
  flex: 0 0 auto;
  display: inline-flex;
  align-items: center;
  justify-content: center;
  width: 1.125rem;
  color: var(--color-text-secondary);
  font-size: var(--font-size-sm);
  line-height: 1;
}

.ui-topbar-search__field {
  flex: 1 1 auto;
  min-width: 0;
}

.ui-topbar-search-form {
  margin: 0;
  width: 100%;
}

.ui-topbar-search-form .input {
  margin: 0;
  width: 100%;
}

body.app-body .ui-topbar-search input.ui-topbar-search__input[type="search"],
body.app-body .ui-topbar-search .ui-topbar-search__input {
  display: block;
  width: 100%;
  height: auto;
  min-height: 0;
  margin: 0;
  padding: 0;
  border: none;
  border-radius: 0;
  background: transparent;
  box-shadow: none;
  font-size: var(--font-size-base);
  font-weight: var(--font-weight-normal);
  line-height: var(--line-height-base);
  letter-spacing: normal;
  color: var(--color-text-primary);
}

.ui-topbar-search__input::placeholder {
  color: var(--color-text-secondary);
}

.ui-topbar-search:focus-within {
  box-shadow: 0 0 0 2px rgba(192, 57, 43, 0.25);
}

body.app-body .ui-topbar-search input.ui-topbar-search__input[type="search"]:focus,
body.app-body .ui-topbar-search .ui-topbar-search__input:focus {
  outline: none;
  box-shadow: none;
  border: none;
}

.ui-topbar__cta.ui-btn--primary {
  padding: var(--space-2) var(--space-4);
  font-size: var(--font-size-base);
  border-radius: var(--radius-lg);
  box-shadow: var(--shadow-overlay);
  color: var(--color-brand-on);
}

.ui-topbar__cta.ui-btn--primary:hover,
.ui-topbar__cta.ui-btn--primary:focus-visible {
  color: var(--color-brand-on);
}

.ui-topbar__toggle {
  display: inline-flex;
  align-items: center;
  justify-content: center;
  gap: var(--space-2);
  min-height: 2rem;
  padding: var(--space-1) var(--space-3);
  border: 1px solid var(--color-border);
  border-radius: var(--radius-sm);
  background: var(--color-surface-card);
  color: var(--color-text-primary);
  font-family: inherit;
  font-size: var(--font-size-sm);
  font-weight: var(--font-weight-semibold);
  cursor: pointer;
  transition: background var(--transition-fast), border-color var(--transition-fast);
}

.ui-topbar__toggle:hover,
.ui-topbar__toggle:focus-visible {
  background: var(--color-surface-zebra);
  outline: none;
  box-shadow: 0 0 0 2px rgba(37, 99, 235, 0.25);
}

@media (min-width: 1024px) {
  .ui-topbar__toggle-label {
    display: none;
  }

  .ui-topbar__toggle {
    padding: var(--space-1) var(--space-2);
    min-width: 2.25rem;
  }

  /* Desktop collapse → icon rail */
  .app-shell.is-sidebar-collapsed .ui-sidebar,
  html.sidebar-collapsed-pending .ui-sidebar {
    flex-basis: 4rem;
    width: 4rem;
    overflow: visible;
  }

  .app-shell.is-sidebar-collapsed .ui-sidebar__logo span,
  .app-shell.is-sidebar-collapsed .ui-sidebar__logo,
  html.sidebar-collapsed-pending .ui-sidebar__logo span,
  html.sidebar-collapsed-pending .ui-sidebar__logo {
    font-size: 0;
  }

  .app-shell.is-sidebar-collapsed .ui-sidebar__logo::before,
  html.sidebar-collapsed-pending .ui-sidebar__logo::before {
    content: 'KR';
    font-size: 0.95rem;
    font-weight: 700;
    color: #f87171;
    letter-spacing: -0.02em;
  }

  .app-shell.is-sidebar-collapsed .ui-sidebar .app-nav-link span,
  .app-shell.is-sidebar-collapsed .ui-sidebar .app-nav-trigger span,
  .app-shell.is-sidebar-collapsed .ui-sidebar .app-nav-chevron,
  .app-shell.is-sidebar-collapsed .ui-sidebar__user span,
  html.sidebar-collapsed-pending .ui-sidebar .app-nav-link span,
  html.sidebar-collapsed-pending .ui-sidebar .app-nav-trigger span,
  html.sidebar-collapsed-pending .ui-sidebar .app-nav-chevron,
  html.sidebar-collapsed-pending .ui-sidebar__user span {
    display: none;
  }

  .app-shell.is-sidebar-collapsed .ui-sidebar .app-nav-link,
  .app-shell.is-sidebar-collapsed .ui-sidebar .app-nav-trigger,
  html.sidebar-collapsed-pending .ui-sidebar .app-nav-link,
  html.sidebar-collapsed-pending .ui-sidebar .app-nav-trigger {
    justify-content: center;
    padding-left: var(--space-2);
    padding-right: var(--space-2);
  }

  .app-shell.is-sidebar-collapsed .ui-sidebar .app-nav-dropdown,
  .app-shell.is-sidebar-collapsed .ui-sidebar .app-nav-sub-dropdown,
  html.sidebar-collapsed-pending .ui-sidebar .app-nav-dropdown,
  html.sidebar-collapsed-pending .ui-sidebar .app-nav-sub-dropdown {
    display: none !important;
  }

  .app-shell.is-sidebar-collapsed .ui-sidebar .app-nav-item--dropdown:hover > .app-nav-dropdown,
  .app-shell.is-sidebar-collapsed .ui-sidebar .app-nav-item--dropdown.is-open > .app-nav-dropdown {
    display: block !important;
    position: absolute;
    left: 100%;
    top: 0;
    min-width: 14rem;
    margin: 0 0 0 0.25rem;
    z-index: calc(var(--z-sidebar) + 5);
    background: var(--color-sidebar-bg);
    border: 1px solid #334155;
    border-radius: var(--radius-md);
    box-shadow: var(--shadow-overlay);
  }

  .app-shell.is-sidebar-collapsed .ui-sidebar .app-nav-item--dropdown {
    position: relative;
  }

  .app-shell.is-sidebar-collapsed .ui-sidebar .app-nav-dropdown .app-nav-sublink,
  .app-shell.is-sidebar-collapsed .ui-sidebar .app-nav-dropdown .app-nav-sub-trigger {
    display: flex;
  }

  .app-shell.is-sidebar-collapsed .ui-sidebar .app-nav-dropdown .app-nav-sublink span,
  .app-shell.is-sidebar-collapsed .ui-sidebar .app-nav-dropdown .app-nav-sub-trigger span {
    display: inline;
  }
}

/* Responsive */
@media (max-width: 1023px) {
  .ui-topbar__toggle-label {
    display: inline;
  }

  .ui-topbar {
    flex-wrap: wrap;
    padding-top: var(--space-2);
    padding-bottom: var(--space-2);
    row-gap: var(--space-2);
  }

  .ui-topbar__search {
    flex: 1 1 100%;
    order: 2;
    min-width: 0;
    max-width: none;
  }

  .ui-topbar__actions {
    order: 3;
    margin-left: 0;
    width: 100%;
    justify-content: flex-end;
  }

  .ui-sidebar {
    position: fixed;
    top: 0;
    left: 0;
    bottom: 0;
    transform: translateX(-100%);
    transition: transform var(--transition-fast);
    box-shadow: var(--shadow-overlay);
  }

  .ui-sidebar.is-open {
    transform: translateX(0);
  }

  .app-shell::after {
    content: '';
    position: fixed;
    inset: 0;
    background: rgba(15, 23, 42, 0.4);
    opacity: 0;
    visibility: hidden;
    transition: opacity var(--transition-fast), visibility var(--transition-fast);
    z-index: calc(var(--z-sidebar) - 1);
    pointer-events: none;
  }

  .app-shell.is-sidebar-open::after {
    opacity: 1;
    visibility: visible;
    pointer-events: auto;
  }
}

.ui-topbar__breadcrumb {
  flex: 0 1 auto;
  min-width: 0;
  font-size: var(--font-size-xs);
  line-height: 1.35;
  color: var(--color-text-secondary);
}

.ui-topbar__breadcrumb .breadcrumbs-trail {
  display: flex;
  flex-wrap: wrap;
  align-items: center;
  gap: 0;
  margin: 0;
  padding: 0;
  list-style: none;
  font-size: var(--font-size-xs);
  line-height: 1.35;
  color: var(--color-text-secondary);
  white-space: normal;
  overflow: visible;
}

.ui-topbar__breadcrumb .breadcrumbs-trail .breadcrumb-item {
  display: inline-flex;
  align-items: center;
}

.ui-topbar__breadcrumb .breadcrumbs-trail .breadcrumb-item + .breadcrumb-item::before {
  content: "›";
  display: inline;
  width: auto;
  height: auto;
  margin: 0 0.35rem;
  background: none;
  font-size: var(--font-size-xs);
  font-weight: 600;
  color: var(--color-text-secondary);
  opacity: 0.75;
}

.ui-topbar__breadcrumb .breadcrumbs-trail .breadcrumb-item a {
  color: var(--color-text-secondary);
  font-weight: var(--font-weight-medium);
  text-decoration: none;
}

.ui-topbar__breadcrumb .breadcrumbs-trail .breadcrumb-item a:hover,
.ui-topbar__breadcrumb .breadcrumbs-trail .breadcrumb-item a:focus-visible {
  color: var(--color-text-primary);
  text-decoration: underline;
}

.ui-topbar__breadcrumb .breadcrumbs-trail .breadcrumb-item.is-current span {
  color: var(--color-text-primary);
  font-weight: var(--font-weight-semibold);
}

/* Sidebar navigation (vertical) — primary vs sub-menu hierarchy */
.ui-sidebar .app-nav {
  width: 100%;
}

.ui-sidebar .app-nav-toggle {
  display: none;
}

.ui-sidebar .app-nav-menu {
  display: flex;
  flex-direction: column;
  align-items: stretch;
  gap: var(--space-1);
  margin: 0;
  padding: 0 var(--space-3);
  list-style: none;
}

.ui-sidebar .app-nav-item {
  display: block;
  width: 100%;
  margin: 0;
}

/* ── Level 1: top-level links & section triggers ── */
.ui-sidebar .app-nav-link,
.ui-sidebar .app-nav-trigger {
  display: flex;
  align-items: center;
  gap: var(--space-3);
  width: 100%;
  min-height: var(--sidebar-nav-item-min-height);
  margin: 0;
  padding: var(--space-3) var(--space-4);
  border: none;
  border-radius: var(--radius-md);
  background: transparent;
  color: var(--color-sidebar-text);
  font-family: inherit;
  font-size: var(--sidebar-nav-font-size);
  font-weight: var(--font-weight-semibold);
  line-height: var(--line-height-tight);
  letter-spacing: -0.01em;
  text-align: left;
  text-decoration: none;
  cursor: pointer;
  box-sizing: border-box;
  transition:
    background var(--transition-fast),
    color var(--transition-fast),
    box-shadow var(--transition-fast);
}

.ui-sidebar .app-nav-link:hover,
.ui-sidebar .app-nav-link:focus-visible,
.ui-sidebar .app-nav-trigger:hover,
.ui-sidebar .app-nav-trigger:focus-visible {
  background: var(--color-sidebar-active-bg);
  color: var(--color-sidebar-text-active);
  outline: none;
}

.ui-sidebar .app-nav-link.is-active,
.ui-sidebar .app-nav-item.is-active > .app-nav-link,
.ui-sidebar .app-nav-item--dropdown.is-active > .app-nav-trigger,
.ui-sidebar .app-nav-item--dropdown.is-open > .app-nav-trigger {
  background: var(--color-sidebar-active-bg);
  color: var(--color-sidebar-text-active);
  box-shadow: inset 4px 0 0 var(--color-sidebar-rail);
}

.ui-sidebar .app-nav-icon {
  flex-shrink: 0;
  width: var(--sidebar-nav-icon-size);
  font-size: var(--sidebar-nav-icon-size);
  text-align: center;
  opacity: 0.95;
}

.ui-sidebar .app-nav-chevron {
  margin-left: auto;
  font-size: 0.85em;
  opacity: 0.75;
  transition: transform var(--transition-fast);
}

.ui-sidebar .app-nav-item.is-open > .app-nav-trigger .app-nav-chevron,
.ui-sidebar .app-nav-item.is-open > .app-nav-sub-trigger .app-nav-chevron {
  transform: rotate(180deg);
}

/* ── Level 2: dropdown panels ── */
.ui-sidebar .app-nav-dropdown,
.ui-sidebar .app-nav-sub-dropdown {
  display: none;
  position: static;
  min-width: 0;
  margin: var(--space-1) 0 var(--space-2);
  padding: var(--space-2) 0;
  list-style: none;
  background: rgba(15, 23, 42, 0.45);
  border: 1px solid rgba(51, 65, 85, 0.85);
  border-left: 3px solid #475569;
  border-radius: 0 var(--radius-md) var(--radius-md) 0;
  box-shadow: inset 0 1px 0 rgba(255, 255, 255, 0.04);
}

.ui-sidebar .app-nav-item--dropdown.is-open > .app-nav-dropdown,
.ui-sidebar .app-nav-item--dropdown.is-active > .app-nav-dropdown,
.ui-sidebar .app-nav-item--sub.is-open > .app-nav-sub-dropdown,
.ui-sidebar .app-nav-item--sub.is-active > .app-nav-sub-dropdown {
  display: block;
}

.ui-sidebar .app-nav-dropdown > li,
.ui-sidebar .app-nav-sub-dropdown > li {
  margin: 0;
  padding: 0 var(--space-2);
}

/* ── Level 2: sub-links ── */
.ui-sidebar .app-nav-link span,
.ui-sidebar .app-nav-trigger span {
  white-space: normal;
  word-break: break-word;
}

.ui-sidebar .app-nav-sublink {
  display: flex;
  align-items: center;
  gap: var(--space-2);
  width: 100%;
  min-height: var(--sidebar-subnav-item-min-height);
  margin: 0.125rem 0;
  padding: var(--space-2) var(--space-3) var(--space-2) var(--sidebar-subnav-indent);
  border-radius: var(--radius-sm);
  color: #cbd5e1;
  font-size: var(--sidebar-subnav-font-size);
  font-weight: var(--font-weight-medium);
  line-height: var(--line-height-tight);
  text-decoration: none;
  white-space: normal;
  word-break: break-word;
  box-sizing: border-box;
  transition:
    background var(--transition-fast),
    color var(--transition-fast),
    box-shadow var(--transition-fast);
}

.ui-sidebar .app-nav-sublink::before {
  content: '';
  flex-shrink: 0;
  width: 0.45rem;
  height: 0.45rem;
  border-radius: 50%;
  background: #64748b;
  transition: background var(--transition-fast), transform var(--transition-fast);
}

.ui-sidebar .app-nav-sublink:hover,
.ui-sidebar .app-nav-sublink:focus-visible {
  background: rgba(30, 41, 59, 0.9);
  color: var(--color-sidebar-text-active);
  outline: none;
}

.ui-sidebar .app-nav-sublink.is-active {
  background: rgba(30, 41, 59, 0.95);
  color: var(--color-sidebar-text-active);
  font-weight: var(--font-weight-semibold);
  box-shadow: inset 3px 0 0 var(--color-sidebar-rail);
}

.ui-sidebar .app-nav-sublink.is-active::before,
.ui-sidebar .app-nav-sublink:hover::before,
.ui-sidebar .app-nav-sublink:focus-visible::before {
  background: var(--color-sidebar-rail);
  transform: scale(1.15);
}

/* ── Level 2.5: nested group trigger (e.g. Education admin) ── */
.ui-sidebar .app-nav-sub-trigger {
  display: flex;
  align-items: center;
  gap: var(--space-2);
  width: 100%;
  min-height: 2.5rem;
  margin: var(--space-2) 0 var(--space-1);
  padding: var(--space-2) var(--space-3) var(--space-2) var(--sidebar-subnav-indent);
  border: none;
  border-radius: var(--radius-sm);
  background: transparent;
  color: #94a3b8;
  font-family: inherit;
  font-size: var(--font-size-xs);
  font-weight: var(--font-weight-bold);
  letter-spacing: 0.08em;
  line-height: var(--line-height-tight);
  text-align: left;
  text-transform: uppercase;
  cursor: pointer;
  box-sizing: border-box;
  transition: background var(--transition-fast), color var(--transition-fast);
}

.ui-sidebar .app-nav-sub-trigger:hover,
.ui-sidebar .app-nav-sub-trigger:focus-visible {
  background: rgba(30, 41, 59, 0.65);
  color: #e2e8f0;
  outline: none;
}

.ui-sidebar .app-nav-item--sub.is-open > .app-nav-sub-trigger {
  color: var(--color-sidebar-text-active);
}

/* ── Level 3: nested sub-dropdown ── */
.ui-sidebar .app-nav-item--sub {
  position: static;
}

.ui-sidebar .app-nav-item--sub::after {
  display: none;
}

.ui-sidebar .app-nav-sub-dropdown {
  margin: 0 0 var(--space-2) var(--space-2);
  padding: var(--space-1) 0;
  background: rgba(2, 6, 23, 0.35);
  border-left-color: #64748b;
}

.ui-sidebar .app-nav-sub-dropdown .app-nav-sublink,
.ui-sidebar .app-nav-sub-dropdown a.app-nav-sublink {
  color: #cbd5e1;
}

.ui-sidebar .app-nav-sub-dropdown .app-nav-sublink:hover,
.ui-sidebar .app-nav-sub-dropdown .app-nav-sublink:focus-visible {
  background: rgba(30, 41, 59, 0.9);
  color: var(--color-sidebar-text-active);
}

.ui-sidebar .app-nav-sub-dropdown .app-nav-sublink {
  font-size: var(--sidebar-subnav-nested-font-size);
  padding-left: calc(var(--sidebar-subnav-indent) + var(--space-2));
}

.ui-sidebar .app-nav-link--logout {
  color: #fca5a5;
  font-size: var(--sidebar-subnav-font-size);
  font-weight: var(--font-weight-semibold);
  min-height: var(--sidebar-subnav-item-min-height);
}

.ui-sidebar .app-nav-link--logout:hover,
.ui-sidebar .app-nav-link--logout:focus-visible {
  background: rgba(248, 113, 113, 0.14);
  color: #fecaca;
}

.ui-sidebar .app-nav-item--logout {
  margin-top: var(--space-2);
  padding-top: var(--space-2);
  border-top: 1px solid #1e293b;
}

/* Content card (legacy .content wrapper) */
body.app-body .main .content,
body.app-body .app-main__content .content {
  padding: var(--space-6);
  background: var(--color-surface-card);
  border: 1px solid var(--color-border);
  border-radius: var(--radius-sm);
  box-shadow: var(--shadow-none);
}

@media (min-width: 1024px) {
  .ui-sidebar .app-nav-item--dropdown:hover > .app-nav-dropdown,
  .ui-sidebar .app-nav-item--dropdown.is-active > .app-nav-dropdown {
    display: block;
  }

  /* Nested sub-menu stays inline in sidebar (override nav.css horizontal flyout) */
  .ui-sidebar .app-nav-dropdown .app-nav-item--sub:hover > .app-nav-sub-dropdown,
  .ui-sidebar .app-nav-dropdown .app-nav-item--sub.is-open > .app-nav-sub-dropdown,
  .ui-sidebar .app-nav-dropdown .app-nav-item--sub.is-active > .app-nav-sub-dropdown {
    display: block;
    position: static;
    top: auto;
    right: auto;
    left: auto;
    width: auto;
    min-width: 0;
    margin: 0 0 var(--space-2) var(--space-2);
    padding: var(--space-1) 0;
    border: 1px solid rgba(51, 65, 85, 0.85);
    border-left: 3px solid #64748b;
    border-radius: 0 var(--radius-md) var(--radius-md) 0;
    box-shadow: inset 0 1px 0 rgba(255, 255, 255, 0.04);
    background: rgba(2, 6, 23, 0.35);
  }
}