/* Sticky card stack — enough scroll per layer for cover effect */
:root {
  --stack-nav: 2.5rem;
  --stack-stick: 3rem;
  --stack-step: 2.75rem;
  --stack-slot: 100vh;
  --stack-slot-last: 55vh;
  /* ~70vh scroll per layer before the next card slides over */
  --stack-scroll-step: 70vh;
  --stack-pull: calc(var(--stack-slot) - var(--stack-scroll-step));
  --stack-body-h: calc(100dvh - var(--stack-stick) - var(--stack-step) * 6 - 3rem);
}