.case-background {
  position: fixed;
  inset: 0;
  z-index: 0;
  overflow: hidden;
  pointer-events: none;
  background: #d7e9d0 url('./meadow-background-poster.jpg') center / cover no-repeat;
}
.case-background video { display: block; width: 100%; height: 100%; object-fit: cover; filter: saturate(.86); }
main { position: relative; z-index: 1; }
.what-if { background: rgba(247,248,243,.84); }
.question { background: rgba(18,51,35,.83); }
.insight { background: linear-gradient(180deg, rgba(237,242,233,.85), rgba(247,248,243,.83) 72%); }
.process { background: rgba(247,248,243,.82); }
.camera { background: rgba(233,239,230,.85); }
.finale { background: rgba(16,43,29,.87); }
/* The original film in .answer remains the only backdrop in that chapter. */
.answer { background-color: #193426; }
@media (prefers-reduced-motion: reduce) { .case-background video { display: none; } }