Circular Dichroism Spectrum Blender (2D)

This 2D companion drives the same real per-structure CD formulas as the 3D lab — three Gaussian-sum spectra for alpha helix, beta sheet and random coil, each built from the same characteristic peak/trough wavelengths used in real far-UV circular dichroism — but instead of scanning one structure at a time in an orbiting 3D scene, it lets you mix all three at once. Three sliders set the fractional content of each motif (auto-normalized so they always sum to 100%), the weighted composite spectrum redraws live as you drag them, and a schematic pair of counter-rotating left- and right-circularly-polarized beams at the top brightens or dims in sync with the sign of the signal at the current scan wavelength — the same convention real spectropolarimeters use, where CD = A(left) − A(right).