.sidebar .nav-link {
    color: #334155;
    border-radius: 8px;
    padding: 0.6rem 0.75rem;
}

.sidebar .nav-link.active,
.sidebar .nav-link:hover {
    background: #eff6ff;
    color: #2563eb;
}

.card-stat {
    border: none;
    border-radius: 12px;
    box-shadow: 0 1px 3px rgba(0,0,0,.08);
}

.qr-box {
    background: #f8fafc;
    border: 1px dashed #cbd5e1;
    border-radius: 12px;
    padding: 1rem;
    word-break: break-all;
}