/* Hero background, aurora variant v2 (loaded only when BG_STYLE = "aurora" in build/site_config.py).
   The classic constellation canvas (#hero-canvas, hero-bg.js) keeps running on top; hero-aurora.js adds
   #hero-aurora underneath it. The soft CSS colour blobs are switched off here, the aurora takes their place. */
html[data-bg=aurora] .hero .hero-bg .aurora{display:none}
html[data-bg=aurora] .hero .hero-bg #hero-aurora{-webkit-mask-image:linear-gradient(180deg,#000 0%,#000 80%,transparent 100%);mask-image:linear-gradient(180deg,#000 0%,#000 80%,transparent 100%)}
html[data-bg=aurora] .hero .hero-bg #hero-aurora{opacity:.8} /* overall aurora alpha x0.8 (v4) */
html[data-bg=aurora] .hero .hero-bg #hero-aurora{transition:opacity 1.2s ease}
html[data-bg=aurora] .hero .hero-bg #hero-aurora.pre{opacity:0} /* faded in once the deferred start runs */