.roi-btn{background:var(--blue);color:#fff;font-weight:700;text-decoration:none;display:inline-block;padding:12px 26px;border-radius:999px;margin-bottom:12px;box-shadow:0 8px 24px rgba(21,99,255,.2);transition:background .3s ease}.roi-btn:hover{background:#004cff;color:#fff}