Schematic illustration of the disk-corona radiative coupling in super-Eddington accretion flows. Soft UV photons from the optically thick disk enter a hot corona confined within the narrow funnel, where they are Compton upscattered by the coronal plasma. In a geometrically thick funnel, the corona is additionally exposed to incoming radiation and multiple reflections from the surrounding walls, enhancing Compton cooling and yielding softer X-ray spectra than in the standard thin-disk scenario (Madau & Haardt 2024).