An animated sunset landscape renders a sun descending over layered terrain. The scene uses SVG gradients that transition through a color cycle, simulating the sky’s shift from day to night. The sun’s downward motion and the gradient’s color changes are driven by SMIL animations, with `animate` elements altering the circle’s `cy` attribute and the gradients’ `stop-color` values. All visuals are constructed with basic SVG shapes and paths, requiring no external libraries.