body { background: #f5f7fb; }
.card-stat { border: 0; border-radius: 1rem; box-shadow: 0 8px 24px rgba(0,0,0,.08); }
.table thead th { white-space: nowrap; }
.overdue-row { background: #fff1f1 !important; }
.sidebar-link { text-decoration: none; }