Kagome metal CsV₃Sb₅ has been well established as a host of a rich landscape of intertwined electronic phases, including electronic nematicity, charge density wave (CDW) ordering, superconductivity, and potential pair density wave (PDW) ordering. However, the nature of the superconductivity and its interactions with other electronic phases are not well understood. Using sub-Kelvin scanning tunneling microscopy, we conducted spectroscopic mapping of the kagome material CsV₃Sb₅ with high energy resolution and dense energy sampling through the superconducting gap. Quasiparticle interference (QPI) analysis, aided by ab initio and symmetry calculations, reveals an isotropic superconducting gap on the Fermi surfaces derived from V M_z-even d orbitals, thereby constraining possible gap symmetries and limiting any gap anisotropy to the remaining V M_z-odd and Sb p_z bands. Meanwhile, the CDW-peak-selected dI/dV spectra closely track the spatially averaged density of states and show no distinct enhancement restricted to subgap energies, which do not support an additional PDW modulation within our sensitivity. Finally, the selective absence of specific QPI scattering vectors points to a spectroscopic sensitivity to sublattice character on the Fermi surface. Together, these results provide a clearer experimental picture of the low‑energy electronic structure relevant to kagome superconductivity in CsV₃Sb₅.