.nav-group { margin-bottom: 8px; }
.nav-group > summary { display: flex; align-items: center; gap: 10px; padding: 12px 10px; border-radius: 8px; color: var(--ink); font-size: 13px; font-weight: 700; cursor: pointer; list-style: none; user-select: none; }
.nav-group > summary::-webkit-details-marker { display: none; }
.nav-group > summary:hover { background: #f5f8fd; }
.nav-group > summary:focus-visible { outline: 2px solid var(--blue); outline-offset: -2px; }
.nav-group-name { flex: 1; white-space: nowrap; }
.nav-chevron { width: 14px; height: 14px; flex-shrink: 0; fill: none; stroke: currentColor; stroke-width: 1.8; transition: transform .15s ease; }
.nav-group[open] > summary .nav-chevron { transform: rotate(90deg); }
.nav-group.has-active > summary { color: var(--blue); }
.nav-group > .nav-list { margin: 2px 0 10px 14px; padding-left: 9px; border-left: 1px solid var(--line); }
.nav-group .nav-item { font-size: 12px; padding: 10px 8px; }
.nav-group .nav-item .nav-icon { width: 18px; height: 18px; flex-basis: 18px; }
.nav-group .nav-item .nav-icon svg { width: 17px; height: 17px; }
.app-shell.sidebar-collapsed .nav-group-name,.app-shell.sidebar-collapsed .nav-chevron { display: none; }
.app-shell.sidebar-collapsed .nav-group > summary { justify-content: center; padding: 11px 0; }
.app-shell.sidebar-collapsed .nav-group > .nav-list { margin-left: 0; padding-left: 0; border-left: 0; }
[data-theme=dark] .nav-group > summary { color: #e8eef8; }
[data-theme=dark] .nav-group > summary:hover { background: #172b49; }
[data-theme=dark] .nav-group.has-active > summary { color: #6da8ff; }
[data-theme=dark] .nav-group > .nav-list { border-color: #28364b; }
@media(max-width:720px) {
  .nav-group-name,.nav-chevron { display: none; }
  .nav-group > summary { justify-content: center; padding: 11px 0; }
  .nav-group > .nav-list { margin-left: 0; padding-left: 0; border-left: 0; }
  .nav-group .nav-item { font-size: 0; justify-content: center; padding: 10px 0; }
}
@media(prefers-reduced-motion:reduce) { .nav-chevron { transition: none; } }