.paper-story {
  max-width: min(1320px, calc(100vw - 3rem));
  margin: 0 auto;
  padding: 2rem 1.4rem 4rem;
}

#quarto-document-content {
  grid-column: screen-start / screen-end;
  max-width: min(1320px, calc(100vw - 2rem));
}

.mobility-story-hero {
  border-bottom: 1px solid var(--border);
  margin-bottom: 2rem;
  padding: 0 0 2.6rem;
}

.mobility-story-hero h2 {
  font-size: clamp(2.1rem, 5vw, 4.9rem);
  line-height: 1;
  margin: 0.55rem 0 1rem;
  max-width: 980px;
}

.mobility-story-hero p {
  color: var(--text-muted);
  font-size: clamp(1rem, 1.5vw, 1.24rem);
  line-height: 1.65;
  max-width: 840px;
}

.story-stat-grid {
  display: grid;
  gap: 0.8rem;
  grid-template-columns: repeat(3, minmax(0, 1fr));
  margin-top: 1.6rem;
  max-width: 920px;
}

.story-stat-grid div {
  border-top: 1px solid var(--border);
  padding-top: 0.85rem;
}

.story-stat-grid strong,
.story-stat-grid span {
  display: block;
}

.story-stat-grid strong {
  color: var(--text-main);
  font-size: clamp(1.35rem, 3vw, 2.45rem);
  line-height: 1;
}

.story-stat-grid span {
  color: var(--text-muted);
  font-size: 0.82rem;
  font-weight: 750;
  letter-spacing: 0.04em;
  margin-top: 0.4rem;
  text-transform: uppercase;
}

.land-story {
  --accent: #d28b45;
}

.land-story .mobility-story-hero h2 {
  max-width: 1040px;
}

.land-story .scrolly-visual img {
  background: #faf7f0;
}

.land-story .contribution-list div {
  border-left-color: var(--accent);
}

.story-progress {
  display: grid;
  gap: 0.5rem;
  grid-template-columns: repeat(auto-fit, minmax(110px, 1fr));
  margin: 1rem 0 3rem;
}

.story-progress span {
  background: var(--surface-strong);
  border-radius: 999px;
  color: var(--text-muted);
  font-size: 0.78rem;
  font-weight: 800;
  padding: 0.45rem 0.65rem;
  text-align: center;
}

.story-progress span.is-visible {
  background: var(--text-main);
  color: var(--site-bg);
}

.story-step {
  display: grid;
  gap: clamp(1.5rem, 4vw, 3rem);
  grid-template-columns: minmax(0, 0.9fr) minmax(320px, 1fr);
  margin: 4rem 0;
  opacity: 0;
  transform: translateY(24px);
  transition: opacity 500ms ease, transform 500ms ease;
}

.story-step.is-visible {
  opacity: 1;
  transform: translateY(0);
}

.scrolly-deck {
  align-items: start;
  display: grid;
  gap: clamp(1.5rem, 4vw, 3.5rem);
  grid-template-columns: minmax(0, 1.65fr) minmax(300px, 0.58fr);
  margin-top: 1.8rem;
}

/* Sticky visual stage for Quarto-style scroll storytelling. */
.scrolly-stage {
  align-items: center;
  display: grid;
  min-height: 85vh;
  position: sticky;
  top: calc(var(--navbar-height, 64px) + 1rem);
}

.scrolly-visual {
  grid-area: 1 / 1;
  margin: 0;
  opacity: 0;
  pointer-events: none;
  position: relative;
  transform: translateY(14px) scale(0.985);
  transition: opacity 420ms ease, transform 420ms ease;
}

.scrolly-visual.is-active {
  opacity: 1;
  pointer-events: auto;
  transform: translateY(0) scale(1);
}

.scrolly-visual img {
  background: rgba(255, 253, 248, 0.96);
  border: 1px solid var(--border);
  border-radius: 0.45rem;
  display: block;
  max-height: 82vh;
  object-fit: contain;
  padding: 0.5rem;
  width: 100%;
}

.scrolly-visual[data-lightbox-src],
.scrolly-inline-visual[data-lightbox-src] {
  cursor: zoom-in;
}

.scrolly-visual[data-lightbox-src]:focus-visible,
.scrolly-inline-visual[data-lightbox-src]:focus-visible {
  outline: 2px solid var(--accent);
  outline-offset: 4px;
}

.scrolly-expand-hint {
  align-items: center;
  background: rgba(10, 10, 10, 0.72);
  border: 1px solid rgba(244, 239, 230, 0.22);
  border-radius: 999px;
  color: var(--text-main);
  display: inline-flex;
  font-size: 0.8rem;
  font-weight: 850;
  height: 1.75rem;
  justify-content: center;
  line-height: 1;
  position: absolute;
  right: 0.75rem;
  top: 0.75rem;
  width: 1.75rem;
}

.scrolly-visual .contribution-list {
  background: var(--surface);
  border: 1px solid var(--border);
  border-radius: 0.45rem;
  box-shadow: var(--shadow);
  margin-top: 0;
  padding: 1.4rem;
}

.scrolly-steps {
  display: grid;
  gap: 0;
}

.scrolly-step {
  border-top: 1px solid var(--border);
  display: flex;
  flex-direction: column;
  justify-content: center;
  min-height: 85vh;
  opacity: 0.46;
  padding: clamp(3rem, 8vw, 5rem) 0;
  transition: opacity 260ms ease, transform 260ms ease;
}

.scrolly-step.is-active {
  opacity: 1;
}

.scrolly-step-number {
  color: var(--text-muted);
  font-size: 0.78rem;
  font-weight: 850;
  letter-spacing: 0.14em;
  margin-bottom: 0.85rem;
}

.scrolly-step h2 {
  font-size: clamp(1.75rem, 3.4vw, 3rem);
  line-height: 1.06;
  margin: 0.45rem 0 1rem;
}

.scrolly-step p {
  color: var(--text-muted);
  font-size: clamp(1rem, 1.2vw, 1.08rem);
  line-height: 1.76;
  margin: 0;
}

.scrolly-inline-visual {
  display: none;
}

.research-lightbox[hidden] {
  display: none;
}

.research-lightbox {
  align-items: center;
  background: rgba(5, 5, 5, 0.88);
  display: flex;
  inset: 0;
  justify-content: center;
  padding: clamp(1rem, 3vw, 2.5rem);
  position: fixed;
  z-index: 2000;
}

.research-lightbox-panel {
  background: #fffdf8;
  border: 1px solid rgba(244, 239, 230, 0.24);
  border-radius: 0.45rem;
  box-shadow: 0 28px 80px rgba(0, 0, 0, 0.42);
  max-width: min(1360px, 96vw);
  padding: clamp(0.8rem, 1.5vw, 1.2rem);
  position: relative;
}

.research-lightbox-image {
  display: block;
  max-height: 88vh;
  max-width: 100%;
  object-fit: contain;
}

.research-lightbox-close {
  background: rgba(5, 5, 5, 0.78);
  border: 1px solid rgba(255, 253, 248, 0.28);
  border-radius: 999px;
  color: #fffdf8;
  font-size: 0.82rem;
  font-weight: 800;
  line-height: 1;
  padding: 0.55rem 0.68rem;
  position: absolute;
  right: 0.65rem;
  top: 0.65rem;
}

.research-lightbox-close:focus-visible {
  outline: 2px solid var(--accent);
  outline-offset: 3px;
}

body.research-lightbox-open {
  overflow: hidden;
}

.story-step h2 {
  margin-top: 0;
}

.story-kicker {
  color: var(--accent);
  font-size: 0.78rem;
  font-weight: 800;
  letter-spacing: 0.12em;
  text-transform: uppercase;
}

.figure-panel {
  background: var(--surface);
  border: 1px solid var(--border);
  border-radius: 0.45rem;
  box-shadow: var(--shadow);
  min-height: 320px;
  padding: 1.2rem;
}

.figure-panel-wide {
  background: rgba(255, 253, 248, 0.96);
}

.figure-panel-wide .figure-caption {
  color: #5b554b;
}

.figure-panel img {
  border-radius: 0.35rem;
  margin-bottom: 1rem;
  width: 100%;
}

.figure-caption {
  color: var(--text-muted);
  font-size: 0.9rem;
  margin: 0.9rem 0 0;
}

.model-stack {
  display: grid;
  gap: 0.75rem;
  margin-top: 1rem;
}

.model-stack div,
.sketch-bars div {
  background: linear-gradient(90deg, rgba(18, 60, 105, 0.12), rgba(40, 115, 101, 0.16));
  border: 1px solid var(--border);
  border-radius: 0.35rem;
  padding: 0.8rem;
}

.sketch-bars {
  display: grid;
  gap: 0.65rem;
  margin-top: 1rem;
}

.sketch-bars div:nth-child(1) {
  width: 100%;
}

.sketch-bars div:nth-child(2) {
  width: 70%;
}

.sketch-bars div:nth-child(3) {
  width: 42%;
}

.contribution-list {
  display: grid;
  gap: 0.7rem;
  margin-top: 1rem;
}

.contribution-list div {
  border-left: 3px solid var(--accent);
  padding-left: 0.85rem;
}

@media (max-width: 900px) {
  .story-progress,
  .story-step,
  .story-stat-grid {
    grid-template-columns: 1fr;
  }

  .scrolly-deck {
    gap: 1rem;
    grid-template-columns: 1fr;
  }

  .scrolly-stage {
    align-items: start;
    background: var(--site-bg);
    display: block;
    min-height: auto;
    padding: 0.35rem 0 0.55rem;
    position: sticky;
    top: var(--navbar-height, 64px);
    z-index: 2;
  }

  .scrolly-stage .scrolly-visual {
    display: none;
    grid-area: auto;
  }

  .scrolly-stage .scrolly-visual.is-active {
    display: block;
  }

  .scrolly-visual img {
    max-height: 34vh;
  }

  .scrolly-step {
    min-height: 78vh;
    padding: calc(34vh + 8rem) 0 2.45rem;
  }

  .scrolly-visual .figure-caption {
    font-size: 0.84rem;
    line-height: 1.5;
    margin-top: 0.65rem;
  }

  .land-story .scrolly-stage {
    display: none;
  }

  .land-story .scrolly-step {
    min-height: auto;
    padding: 2.65rem 0;
  }

  .land-story .scrolly-inline-visual {
    background: #faf7f0;
    border: 1px solid var(--border);
    border-radius: 0.45rem;
    display: block;
    margin: 0 0 1.1rem;
    max-height: 36vh;
    object-fit: contain;
    padding: 0.5rem;
    width: 100%;
  }

  .land-story .scrolly-inline-visual.contribution-list {
    background: var(--surface);
    max-height: none;
    object-fit: initial;
    padding: 1rem;
  }

  .figure-panel {
    min-height: auto;
  }
}

@media (prefers-reduced-motion: reduce) {
  .story-step,
  .scrolly-step,
  .scrolly-visual {
    opacity: 1;
    transform: none;
    transition: none;
  }
}