body { background: #f5f7fb; }
.sidebar { width: 280px; background: linear-gradient(180deg,#0f172a,#1e293b); }
.nav-item-link { color: #e2e8f0; border-radius: 12px; }
.nav-item-link:hover { color: #fff; background: rgba(255,255,255,.08); }