/* Keep sidebar scrolling in sidebar-scroll.css; these rules style only groups. */
#sidebar .nav-group {
    border: 1px solid rgba(148, 163, 184, .12);
    background: rgba(15, 23, 42, .26);
    border-radius: 12px;
    overflow: hidden;
    margin: 6px 0;
}
#sidebar .nav-group > summary {
    display: flex;
    align-items: center;
    gap: 10px;
    min-height: 48px;
    padding: 0 12px;
    color: #cbd5e1;
    font-weight: 600;
    cursor: pointer;
    user-select: none;
    list-style: none;
}
#sidebar .nav-group > summary::-webkit-details-marker { display: none; }
#sidebar .nav-group > summary:hover,
#sidebar .nav-group[open] > summary { background: rgba(255,255,255,.055); color: #fff; }
#sidebar .nav-group > summary:focus-visible,
#sidebar .nav-item[data-page]:focus-visible { outline: 2px solid #60a5fa; outline-offset: -2px; }
#sidebar .nav-group-count {
    margin-left: auto;
    padding: 2px 7px;
    border-radius: 999px;
    color: #94a3b8;
    background: rgba(148,163,184,.12);
    font-size: 11px;
    line-height: 1.4;
}
#sidebar .nav-group-arrow { font-size: 18px; transition: transform .18s ease; }
#sidebar .nav-group[open] .nav-group-arrow { transform: rotate(180deg); }
#sidebar .nav-group-items { padding: 4px 6px 8px 7px; border-top: 1px solid rgba(148,163,184,.1); }
#sidebar .nav-group-items .nav-item { min-height: 44px; padding-left: 12px; font-size: 13px; line-height: 1.35; }
#sidebar .nav-group-items .nav-item.active { background: rgba(59,130,246,.14); }
@media (prefers-reduced-motion: reduce) {
    #sidebar .nav-group-arrow { transition: none; }
}