/* ============================================================ AIKO — theme layer Nebula background + ambient particle canvas layers. ⚠ **Do NOT touch the UI accent / glass panel colors here.** The first version also changed --primary-accent / --secondary-accent / --glass-bg to purple-pink, and the user immediately reported "the UI is wrong, where did the previous UI go" — all they had asked for was the background, but the panels went from deep blue to purple and more transparent, making the whole site look like a different product. Lesson: **only change the layer you were asked to change.** Keep the :root values in style.css untouched (--primary-accent #6366f1 / --glass-bg rgba(15,23,42,.75)). ⚠ Load order: this file must come after the other styles in (the landing page writes its body background in an inline