.ppk-page {
  padding-bottom: clamp(5rem, 12vw, 10rem);
}

.ppk-opening-evidence {
  width: 100%;
  background: var(--charcoal);
  color: var(--paper-bright);
}

.ppk-opening-evidence img {
  height: auto;
}

.ppk-opening-evidence figcaption {
  width: min(100% - (var(--gutter) * 2), var(--page-max));
  margin: 0 auto;
  padding-block: 0.75rem 1rem;
  color: inherit;
}

.ppk-problem-layout,
.ppk-architecture-layout {
  display: grid;
  grid-template-columns: minmax(0, 0.9fr) minmax(18rem, 1.1fr);
  gap: clamp(2rem, 7vw, 8rem);
  align-items: start;
}

.ppk-walkthrough-evidence {
  margin-top: clamp(2rem, 6vw, 7rem);
}

.ppk-build {
  margin-left: auto;
  width: min(100%, 76rem);
}

.ppk-geometry-evidence {
  margin-top: 1rem;
}

.ppk-evidence-grid {
  display: grid;
  grid-template-columns: minmax(16rem, 0.72fr) minmax(18rem, 1.28fr);
  gap: clamp(2rem, 7vw, 9rem);
  align-items: center;
}

.ppk-topdown-inset {
  border: 1px solid var(--line);
  padding: 0.75rem;
}

.ppk-evidence-copy p + p {
  margin-top: 1.25rem;
}

.ppk-matched-pair {
  display: grid;
  grid-template-columns: repeat(2, minmax(0, 1fr));
  gap: 1px;
  margin-top: clamp(2.5rem, 6vw, 6rem);
  background: var(--line);
}

.ppk-matched-pair .evidence-figure {
  display: grid;
  grid-template-rows: minmax(0, 1fr) auto;
  aspect-ratio: 16 / 9;
  overflow: hidden;
  background: var(--paper);
  padding-bottom: 1rem;
}

.ppk-matched-pair .evidence-figure picture {
  min-height: 0;
  height: 100%;
}

.ppk-matched-pair img {
  width: 100%;
  height: 100%;
  object-fit: cover;
  object-position: 50% 50%;
}

.ppk-matched-pair figcaption,
.ppk-operational-pair figcaption {
  padding-inline: 1rem;
}

.ppk-matched-pair figcaption {
  min-height: 2.7em;
}

.ppk-operational-pair {
  display: grid;
  grid-template-columns: minmax(0, 0.8fr) minmax(0, 1.2fr);
  gap: clamp(1.5rem, 4vw, 4rem);
  margin-top: clamp(2.5rem, 6vw, 6rem);
}

.ppk-technologies {
  max-width: 52rem;
}

.ppk-architecture-band {
  margin-block-end: 0;
  padding-block: clamp(4rem, 8vw, 8rem);
  background: var(--charcoal);
  color: var(--paper-bright);
}

.ppk-architecture-band .boundary-note {
  margin-bottom: 2rem;
}

.ppk-boundary-diagrams {
  display: grid;
  grid-template-columns: repeat(2, minmax(0, 1fr));
  gap: clamp(1.5rem, 4vw, 4rem);
}

.ppk-architecture-band figcaption {
  color: var(--paper);
}

@media (max-width: 42rem) {
  .ppk-problem-layout,
  .ppk-architecture-layout,
  .ppk-evidence-grid,
  .ppk-matched-pair,
  .ppk-operational-pair,
  .ppk-boundary-diagrams {
    grid-template-columns: 1fr;
  }

  .ppk-walkthrough-evidence,
  .ppk-geometry-evidence {
    margin-top: 0.5rem;
  }

  .ppk-topdown-inset {
    max-width: none;
  }
}