Animate this original artwork as a refined five-second website hero media asset. The exact pastel molecular ribbon structure slowly turns about its vertical axis while small highlights travel along the strands. Preserve connected structure and colours, no morphing or added atoms. Preserve original identities, proportions, palette and materials. Locked camera unless explicitly specified. No zoom, cuts, text, UI, new objects or distorted anatomy. Continuous restrained motion; begin and end near the same composition where physically plausible.