methods SP♤DE — a joint spectro-photometric decomposition engine Fitting imaging, stellar kinematics and stellar populations under one likelihood to separate classical bulges from pseudobulges. observations Galaxy size evolution with CLAUDS + HSC Two-wavelength structural analysis of galaxies in COSMOS since z ~ 1. Environment & galaxy size growth Comparing quiescent galaxies in clusters vs. the field at two rest-frame wavelengths. Bulge+Disk morphology in UV vs. optical Distinct growth tracks for star-forming and quiescent galaxies. Galaxy quenching with KILOGAS Resolved spectroscopy of star-formation shutdown in nearby galaxies. Stellar IMF variations with JWST + Subaru PFS Spectro-photometric constraints on the IMF slopes across galaxies. simulations Star-forming main sequence in IllustrisTNG Origin of star formation main sequence in TNG Universe using symbolic regression.