A low bed of glowing coals along the bottom edge, with short licks of flame.

The same noise-driven fire held low: a bed of glowing coals along the bottom edge pulses slowly under short licks of flame, and the rest of the stage stays dark for content. Coals are a stretched noise field thresholded into cracks of heat that breathe out of phase. Reads the page's primary and secondary as the glow, with a fire palette fallback. A hearth-like footer glow or section divider where a full inferno would overpower the page.