::-webkit-scrollbar { width: 6px; }
        ::-webkit-scrollbar-track { background: #f1f1f1; }
        ::-webkit-scrollbar-thumb { background: #cbd5e1; border-radius: 10px; }
        ::-webkit-scrollbar-thumb:hover { background: #94a3b8; }

        .plan-radio:checked + div {
            border-color: #1E40AF;
            background-color: #EFF6FF;
            box-shadow: 0 4px 6px -1px rgba(0, 0, 0, 0.1), 0 2px 4px -1px rgba(0, 0, 0, 0.06);
        }
        .plan-radio:checked + div .check-icon {
            display: block;
        }