Atmospheric backgrounds on the home page

Home page hero crossfade - the home page now has a slow, ambient slideshow of atmospheric imagery cycling behind the OpenFiction logo and search bar. Four images crossfade gently over a one-minute loop, each holding for around 12 seconds. A soft overlay keeps the text and search bar fully legible while letting the imagery show through at the edges.

The animation respects your accessibility preferences - if you have "Reduce motion" enabled, you'll see a single static image instead of the cycling slideshow.