/**
 * Enterprise sidebar enhancement.
 * Safe overlay: only adds/overrides styles. No HTML or JS changes required.
 * Rollback: remove this file and refresh.
 */
.app-sidebar {
    background: linear-gradient(180deg, #0f172a 0%, #111827 100%);
    border-right: 1px solid rgba(255,255,255,0.05);
}

.app-sidebar .nav-link {
    border-radius: 8px;
    margin: 4px 8px;
    padding: 10px 14px;
    font-weight: 500;
    color: #cbd5e1 !important;
    transition: all 0.2s ease;
}

.app-sidebar .nav-link:hover {
    background: rgba(59,130,246,0.15);
    color: #ffffff !important;
    transform: translateX(3px);
}

.app-sidebar .nav-link.active {
    background: linear-gradient(90deg,#2563eb,#1d4ed8);
    color: #fff !important;
    box-shadow: 0 3px 10px rgba(0,0,0,0.25);
}

.app-sidebar .nav-treeview .nav-link,
.app-sidebar .collapse .nav .nav-link {
    font-size: 13px;
    padding-left: 28px;
    opacity: 0.85;
}

.app-sidebar .nav-treeview .nav-link:hover,
.app-sidebar .collapse .nav .nav-link:hover {
    background: rgba(255,255,255,0.06);
}

.app-sidebar .nav-item > .nav-link > i {
    width: 22px;
    text-align: center;
}

.app-sidebar .brand-link {
    border-bottom: 1px solid rgba(255,255,255,0.06);
}

.app-sidebar .brand-link span {
    font-weight: 600;
    letter-spacing: .3px;
}

.app-sidebar .nav-header {
    font-size: 11px;
    text-transform: uppercase;
    letter-spacing: .5px;
    opacity: .6;
}

.sidebar-mini.sidebar-collapse .app-sidebar .nav-link span {
    display: none;
}

/* Optional: subtle separators between groups */
.app-sidebar .nav-item + .nav-item {
    margin-top: 2px;
}