:root{--radius:1rem}
body{background:#f6f7fb}
.card{border:0;border-radius:var(--radius);box-shadow:0 10px 30px rgba(0,0,0,.06)}
.nav-link{border-radius:.6rem}
.nav-link.active,.nav-link:hover{background:#495057;color:#fff !important}
.table thead th{background:#f0f2f6}
.print-invoice{max-width:900px;margin:0 auto;position:relative}
.paid-stamp{position:absolute;top:40px;left:40px;transform:rotate(-20deg);border:4px solid #0d6efd;color:#0d6efd;padding:.6rem 1.2rem;font-weight:700;border-radius:.4rem;opacity:.85}
@media print{#sidebar, .no-print{display:none!important} body{background:#fff} .print-invoice{box-shadow:none}}