body { background-color: #f4f6f9; }
.sidebar { width: 220px; min-width: 220px; }
.sidebar .nav-link.active, .sidebar .nav-link:hover { background-color: #495057; border-radius: 6px; }
.card { border: none; box-shadow: 0 1px 3px rgba(0,0,0,0.08); }