/* Isolated reading experience; shared typography and palette stay authoritative. */
.perspective-story-page {
  --story-sidebar: clamp(320px, 30vw, 400px);
  --story-gap: clamp(40px, 5vw, 80px);
  --story-top: calc(var(--header) + var(--s10));
  --story-copy-size: clamp(16px, 1.23vw, 18px);
  --story-heading-size: clamp(25px, 2.35vw, 34px);
  --story-section-height: 66svh;
  --map-title-size: 18px;
  --map-label-size: 12px;
  --map-detail-size: 11px;
  --map-heading-size: var(--tiny);
  --map-rule-width: 1px;
  --map-active-width: 1.25px;
  --map-blue-wash: color-mix(in srgb, var(--accent) 4%, var(--surface));
  --story-ease: cubic-bezier(0.22, 1, 0.36, 1);
  --story-duration: 800ms;
  --story-small-header: 112px;
  --story-mobile-visual: 248px;
  --story-mobile-viewport: 47svh;
  --story-offset: 0;
}
.reading-story {
  display: grid;
  grid-template-columns: var(--story-sidebar) minmax(0, 1fr);
  grid-template-areas: "sidebar copy";
  align-items: start;
  gap: var(--story-gap);
  padding-top: var(--s10);
  padding-bottom: var(--s16);
  position: relative;
}
.reading-sidebar {
  grid-area: sidebar;
  position: sticky;
  top: var(--story-top);
  min-width: 0;
}
.reading-nav {
  position: static;
}
.reading-copy {
  grid-area: copy;
  min-width: 0;
}
.reading-section-inner {
  max-width: var(--copy);
}
.reading-copy section {
  display: flex;
  align-items: center;
  min-height: var(--story-section-height);
  padding-block: var(--s16);
  scroll-margin-top: var(--story-top);
}
.reading-copy section:first-child {
  align-items: flex-start;
  padding-top: var(--s4);
}
.reading-copy section:last-child {
  min-height: 62svh;
}
.reading-copy h2 {
  font-size: var(--story-heading-size);
  line-height: 1.22;
  text-wrap: balance;
}
.reading-copy p {
  font-size: var(--story-copy-size);
  line-height: 1.75;
}
.reading-copy section.is-current h2 {
  color: var(--ink);
}
.reading-visual {
  margin: var(--s6) 0 0;
  min-width: 0;
  background: var(--paper);
  border-top: var(--rule) solid var(--line);
  padding-top: var(--s4);
}
/* The diagram sizes itself to its copy; connectors follow the real panel bounds. */
.perspective-map {
  position: relative;
  display: grid;
  gap: var(--s8);
  width: 100%;
  --branch: 1;
  --merge: 1;
  --next: 1;
  --foundation: 1;
}
.map-connections {
  position: absolute;
  inset: 0;
  width: 100%;
  height: 100%;
  overflow: visible;
  pointer-events: none;
}
.connection-track {
  stroke: var(--line);
  stroke-width: var(--map-rule-width);
}
.connection-ink {
  stroke: var(--accent);
  stroke-width: var(--map-active-width);
}
.map-connections path {
  vector-effect: non-scaling-stroke;
  stroke-linecap: round;
  stroke-linejoin: round;
}
.connection-ink path {
  stroke-dasharray: 1;
}
.flow-branch {
  stroke-dashoffset: calc(1 - var(--branch));
}
.flow-merge {
  stroke-dashoffset: calc(1 - var(--merge));
}
.flow-next {
  stroke-dashoffset: calc(1 - var(--next));
}
.map-panel {
  position: relative;
  background: var(--surface);
  color: var(--ink);
  text-align: center;
  display: flex;
  flex-direction: column;
  align-items: center;
  justify-content: center;
  gap: var(--s2);
  padding: var(--s4) var(--s3);
  border: var(--rule) solid transparent;
  text-decoration: none;
  transition:
    background-color 400ms var(--story-ease),
    border-color 400ms var(--story-ease),
    color 400ms var(--story-ease);
}
.map-panel strong {
  font-size: var(--map-label-size);
  font-weight: 600;
  line-height: 1.4;
}
.map-panel > span:not(.map-overline):not(.foundation-rule) {
  color: var(--muted);
  font-size: var(--map-detail-size);
  line-height: 1.5;
}
.map-panel:hover,
.map-panel:focus-visible {
  border-color: var(--accent);
  background: var(--map-blue-wash);
  color: var(--accent);
  text-decoration: none;
}
.map-panel:focus-visible {
  outline: var(--focus-width) solid var(--accent);
  outline-offset: var(--s1);
}
.map-foundation {
  padding-block: var(--s5);
}
.map-foundation strong {
  font-size: var(--map-title-size);
}
.map-overline {
  text-transform: uppercase;
  letter-spacing: 0.12em;
  font-size: var(--map-detail-size);
  color: var(--accent);
}
.foundation-rule {
  position: absolute;
  bottom: calc(-1 * var(--rule));
  left: 0;
  width: 100%;
  height: var(--map-active-width);
  background: var(--accent);
  transform: scaleX(var(--foundation));
  transform-origin: left;
}
.map-perspectives {
  display: grid;
  grid-template-columns: repeat(3, minmax(0, 1fr));
  gap: var(--s2);
}
.map-perspective {
  justify-content: flex-start;
  padding-inline: var(--s2);
}
.map-perspective strong {
  overflow-wrap: anywhere;
}
.map-explanation {
  margin-top: var(--s2);
}
.map-integration {
  margin-inline: var(--s4);
}
.map-next {
  background: var(--accent);
  color: var(--paper);
  padding-inline: var(--s6);
  padding-block: var(--s5);
}
.map-next strong {
  font-size: var(--small);
}
.map-next > span:not(.map-overline):not(.foundation-rule) {
  color: inherit;
}
.map-next:hover,
.map-next:focus-visible {
  background: var(--accent-hover);
  color: var(--paper);
}
.motion-enabled [data-phase="1"] .map-foundation,
.motion-enabled [data-phase="2"] .map-perspective,
.motion-enabled [data-phase="3"] .map-integration {
  background: var(--map-blue-wash);
  border-color: var(--accent);
}
.motion-enabled [data-phase="0"] .perspective-context {
  border-color: var(--accent);
}
.motion-enabled [data-phase="4"] .map-next {
  background: var(--accent-hover);
}
.motion-enabled .reading-section-inner {
  transform: translateY(calc(var(--story-offset) * var(--s4)));
}

/* Compact three-column alternative, alongside the stacked-sidebar preview. */
@media (min-width: 901px) {
  .story-three-column {
    --story-toc: var(--toc);
    --story-gap: clamp(20px, 2.4vw, 36px);
    --story-section-height: 46svh;
    --story-heading-size: clamp(25px, 2vw, 30px);
    --story-top: calc(var(--header) + var(--s5));
  }
  .story-three-column .reading-story {
    grid-template-columns: var(--story-toc) minmax(0, 1fr) minmax(280px, 0.75fr);
    grid-template-areas: "nav copy visual";
  }
  .story-three-column .reading-sidebar {
    display: contents;
  }
  .story-three-column .reading-nav {
    grid-area: nav;
    position: sticky;
    top: var(--story-top);
  }
  .story-three-column .reading-visual {
    grid-area: visual;
    position: sticky;
    top: var(--story-top);
    margin: 0;
  }
  .story-three-column .reading-copy section {
    padding-block: var(--s8);
  }
  .story-three-column .reading-copy section:first-child {
    padding-top: var(--s4);
  }
  .story-three-column .reading-copy section:last-child {
    min-height: var(--story-section-height);
  }
  .story-three-column .reading-copy .reading-step {
    margin-bottom: var(--s3);
  }
}

@media (max-width: 1180px) and (min-width: 901px) {
  .perspective-story-page {
    --story-gap: var(--s6);
    --map-title-size: 17px;
  }
}
@media (max-width: 900px) {
  .perspective-story-page {
    --story-top: calc(var(--header) + var(--s3));
    --story-heading-size: 28px;
    --story-copy-size: 17px;
  }
  .reading-story {
    display: block;
    padding-top: 0;
  }
  .reading-sidebar {
    display: contents;
  }
  .reading-visual {
    position: static;
    margin-bottom: var(--s8);
  }
  .reading-copy section {
    min-height: var(--story-mobile-viewport);
    padding-block: var(--s8) var(--s14);
    scroll-margin-top: var(--story-top);
  }
  .reading-copy section:last-child {
    min-height: var(--story-mobile-viewport);
  }
}
@media (min-width: 901px) and (max-height: 740px) {
  .reading-visual,
  .story-three-column .reading-visual,
  .reading-sidebar {
    position: static;
  }
}
@media (prefers-reduced-motion: reduce) {
  html {
    scroll-behavior: auto;
  }
  .reading-story *,
  .reading-story *::before {
    transition: none !important;
    transform: none !important;
  }
  .connection-ink path {
    stroke-dashoffset: 0 !important;
  }
}
@media print {
  .reading-story {
    display: block;
  }
  .reading-sidebar {
    display: contents;
  }
  .reading-nav {
    display: none;
  }
  .reading-visual {
    position: static;
    width: 70%;
    margin: 0 auto var(--s8);
  }
  .reading-copy section {
    min-height: 0;
    padding-block: var(--s6);
  }
  .connection-ink path {
    stroke-dashoffset: 0;
  }
}