.nav { display: block; padding: 0.375rem 1rem; font-size: 0.875rem; color: #d1d5db; }
.nav:hover { background: #1f2937; color: #fff; }
.nav.active { background: #374151; color: #fff; }
.card.sortable-chosen { box-shadow: 0 4px 12px rgba(0,0,0,.15); }
#panel:empty { display: none; }