/* ============================================
   STORY ENGINE STYLES (css/story.css)
   Pairs with js/story.js. Loaded after styles.css, so every colour,
   font, radius and shadow comes from the site's design tokens and a
   case study automatically picks up its project accent.

   Rules this file keeps:
   - No text smaller than 16px (captions, tags, labels included).
   - Motion only under html.st-motion (set by JS when the reader
     hasn't asked for reduced motion or paused the site's motion).
   - The background line lives in the side gutters; anything it has
     to cross in the centre is an empty band or an opaque panel.

   1.  Page frame + utilities
   2.  Opening card + summary
   3.  Diamond bands + checkpoints
   4.  Chapters + layouts
   5.  Figures + placeholders
   6.  Visual: idea scatter
   7.  Visual: impact/risk funnel
   8.  Visual: feature cards
   9.  Visual: pinned phone
   10. Visual: gallery
   11. Interlude (halfway)
   12. Metrics, reflection, next story
   13. Background line (spine)
   14. Desktop navigator
   15. Mobile progress bar + Chapters menu
   16. Page transitions
   17. Reduced motion
   ============================================ */


/* ============================================
   1. PAGE FRAME + UTILITIES
   ============================================ */

:root {
  --st-nav-h: 66px;
  --st-col: 1120px;
  --st-gutter: clamp(16px, 5vw, 40px);
  --st-wrap: min(var(--st-col), 100% - var(--st-gutter) * 2);
  --st-ease: cubic-bezier(0.2, 0.75, 0.2, 1);
}

@media (min-width: 1100px) {
  /* Wide gutters on desktop hold the line and the navigator. */
  :root { --st-gutter: clamp(112px, 11vw, 260px); }
}

.story {
  position: relative;
  z-index: 10;
  padding-top: calc(var(--st-nav-h) + var(--sp-4));
  overflow-x: clip;
}

.story > :not(.st-spine) {
  position: relative;
  z-index: 1;
}

.st-sr {
  position: absolute;
  width: 1px;
  height: 1px;
  margin: -1px;
  padding: 0;
  overflow: hidden;
  clip: rect(0 0 0 0);
  white-space: nowrap;
  border: 0;
}

.st-eyebrow {
  display: flex;
  flex-wrap: wrap;
  align-items: center;
  gap: var(--sp-2) var(--sp-3);
  font-size: 1rem;
  font-weight: 600;
  letter-spacing: 0.1em;
  text-transform: uppercase;
  color: var(--accent-strong);
  margin-bottom: var(--sp-4);
}

.st-eyebrow .st-stage {
  color: var(--text-muted);
  font-weight: 500;
}

/* Stage, then the chapter's kicker: "Develop · Low fidelity" */
.st-eyebrow .st-stage + .st-stage::before {
  content: '\00B7';
  margin-right: var(--sp-3);
}

.st-num {
  font-variant-numeric: tabular-nums;
}

/* Unfilled copy is impossible to miss. */
.st-todo {
  background: color-mix(in srgb, var(--accent) 18%, transparent);
  color: var(--text);
  outline: 1px dashed var(--accent-strong);
  outline-offset: 1px;
  border-radius: 4px;
  padding: 0 4px;
}


/* ============================================
   2. OPENING CARD + SUMMARY
   A giant version of the homepage card: the card's image and
   title morph into this, and the line is pulled out of its base.
   ============================================ */

.st-opening {
  width: min(960px, 100% - var(--st-gutter) * 2);
  margin: 0 auto;
}

.st-back {
  display: inline-flex;
  align-items: center;
  gap: var(--sp-2);
  min-height: 44px;
  margin-bottom: var(--sp-3);
  font-size: 1rem;
  font-weight: 600;
  color: var(--accent-strong);
  transition: color var(--t-base), gap var(--t-base);
}

.st-back:hover { color: var(--accent-deep); gap: var(--sp-3); }

.st-opening-bar {
  display: flex;
  flex-wrap: wrap;
  align-items: center;
  justify-content: space-between;
  column-gap: var(--sp-6);
  margin-bottom: var(--sp-3);
}

.st-opening-bar .st-back { margin-bottom: 0; }

.st-card {
  position: relative;
  z-index: 2;
  background: var(--paper);
  border: 1px solid color-mix(in srgb, var(--accent) 22%, transparent);
  border-radius: var(--r-xl);
  overflow: hidden;
  box-shadow: var(--shadow-card);
}

.st-card-media {
  aspect-ratio: 16 / 9;
  max-height: 52svh;
  width: 100%;
  overflow: hidden;
  /* Its own top corners (not just the card's clip), so the rounded
     shape is part of the morph instead of popping in at the end. */
  border-radius: var(--r-xl) var(--r-xl) 0 0;
  /* The same tinted mat as the homepage card's thumbnail, with the
     image inset, so the morph between them lines up. */
  padding: clamp(16px, 3.5%, 36px);
  background: color-mix(in srgb, var(--accent) 12%, var(--paper));
}

.st-card-media img {
  width: 100%;
  height: 100%;
  object-fit: cover;
  border-radius: var(--r-lg);
  box-shadow: var(--shadow-sm);
  outline: 1px solid color-mix(in srgb, var(--accent) 14%, transparent);
}

/* Until real images are approved, the opening image can be a
   placeholder (meta.hero.placeholder) that fills the same frame. */
.st-card-media .st-placeholder {
  height: 100%;
  aspect-ratio: auto !important;
  border-radius: 0;
}

.st-card-body {
  padding: clamp(var(--sp-6), 4vw, var(--sp-12));
}

.st-title {
  font-family: var(--font-display);
  font-size: clamp(3rem, 2rem + 5vw, 5.5rem);
  font-weight: 400;
  line-height: 1;
  letter-spacing: -0.035em;
  color: var(--text);
  margin-bottom: var(--sp-3);
  text-wrap: balance;
}

.st-subtitle {
  font-size: clamp(1.125rem, 1rem + 0.5vw, 1.375rem);
  line-height: 1.5;
  color: var(--text-secondary);
  max-width: 38rem;
  margin-bottom: var(--sp-6);
  text-wrap: pretty;
}

.st-tags {
  display: flex;
  flex-wrap: wrap;
  gap: var(--sp-2);
  list-style: none;
}

.st-tags li {
  font-size: 1rem;
  line-height: 1.3;
  padding: 0.45rem 0.9rem;
  border-radius: var(--r-pill);
  background: var(--accent-subtle);
  border: 1px solid color-mix(in srgb, var(--accent) 24%, transparent);
  color: var(--accent-strong);
  font-weight: 500;
}

.st-summary {
  margin-top: var(--sp-8);
  padding-top: var(--sp-6);
  border-top: 1px solid var(--border);
}

.st-summary-lead {
  font-size: clamp(1.125rem, 1rem + 0.6vw, 1.375rem);
  font-weight: 500;
  line-height: 1.5;
  color: var(--text);
  max-width: 42rem;
  text-wrap: pretty;
}

.st-summary-toggle {
  display: inline-flex;
  align-items: center;
  gap: var(--sp-2);
  min-height: 44px;
  margin-top: var(--sp-4);
  padding: 0 var(--sp-6);
  border-radius: var(--r-pill);
  border: 1px solid color-mix(in srgb, var(--accent) 40%, transparent);
  background: transparent;
  color: var(--accent-strong);
  font: inherit;
  font-size: 1rem;
  font-weight: 600;
  transition: background var(--t-base), border-color var(--t-base);
}

.st-summary-toggle:hover {
  background: var(--accent-subtle);
  border-color: var(--accent);
}

.st-summary-toggle i { transition: transform var(--t-base); }
.st-summary-toggle[aria-expanded="true"] i { transform: rotate(180deg); }

.st-summary-more {
  margin-top: var(--sp-6);
}

.st-motion .st-summary-more:not([hidden]) {
  animation: st-rise 0.5s var(--st-ease) both;
}

.st-summary-points {
  display: grid;
  gap: var(--sp-4) var(--sp-8);
}

@media (min-width: 700px) {
  .st-summary-points { grid-template-columns: 1fr 1fr; }
}

.st-summary-points dt {
  font-size: 1rem;
  font-weight: 600;
  letter-spacing: 0.08em;
  text-transform: uppercase;
  color: var(--accent-strong);
  margin-bottom: var(--sp-1);
}

.st-summary-points dd {
  font-size: 1.0625rem;
  line-height: 1.6;
  color: var(--text-secondary);
}

.st-skip {
  display: inline-flex;
  align-items: center;
  gap: var(--sp-2);
  min-height: 44px;
  margin-top: var(--sp-6);
  font-size: 1rem;
  font-weight: 600;
  color: var(--accent-strong);
  text-decoration: underline;
  text-decoration-color: color-mix(in srgb, var(--accent) 50%, transparent);
  text-underline-offset: 0.3em;
}

.st-skip:hover { color: var(--accent-deep); }

@keyframes st-rise {
  from { opacity: 0; transform: translateY(12px); }
  to   { opacity: 1; transform: none; }
}


/* ============================================
   3. DIAMOND BANDS + CHECKPOINTS
   Empty space above each point is where the line swings between
   the centre and the gutters, so nothing sits there.
   ============================================ */

.st-band {
  display: flex;
  flex-direction: column;
  align-items: center;
  padding-inline: var(--st-gutter);
  text-align: center;
}

.st-diamond-intro {
  padding-top: clamp(var(--sp-16), 10vw, 140px);
  padding-bottom: clamp(var(--sp-8), 4vw, var(--sp-12));
}

.st-diamond-intro .st-point { margin-bottom: var(--sp-8); }

@media (min-width: 1100px) {
  .st-diamond-intro .st-point { margin-bottom: 170px; }
}

.st-diamond-intro-text .st-eyebrow { justify-content: center; }

.st-diamond-title {
  font-family: var(--font-display);
  font-size: clamp(2.25rem, 1.6rem + 2.6vw, 3.75rem);
  font-weight: 400;
  letter-spacing: -0.02em;
  line-height: 1.05;
  color: var(--text);
  text-wrap: balance;
}

.st-point {
  display: block;
  width: 14px;
  height: 14px;
  flex: none;
  transform: rotate(45deg);
  border: 2px solid var(--accent);
  background: var(--bg);
  transition: background 0.5s ease, box-shadow 0.5s ease;
}

.st-point.is-reached {
  background: var(--accent);
  box-shadow: 0 0 0 6px var(--accent-glow);
}

.st-pinch {
  position: relative;
  padding-top: clamp(var(--sp-8), 6vw, var(--sp-12));
  padding-bottom: clamp(var(--sp-12), 8vw, 120px);
  scroll-margin-top: calc(var(--st-nav-h) + var(--sp-6));
}

.st-pinch .st-point {
  width: 18px;
  height: 18px;
}

.st-pinch-label {
  margin-top: var(--sp-4);
  font-family: var(--font-display);
  font-size: clamp(1.5rem, 1.2rem + 1vw, 2rem);
  line-height: 1.2;
  color: var(--text);
}

.st-pinch-kicker {
  display: block;
  font-family: var(--font-body);
  font-size: 1rem;
  font-weight: 600;
  letter-spacing: 0.1em;
  text-transform: uppercase;
  color: var(--accent-strong);
  margin-bottom: var(--sp-1);
}

@media (min-width: 1100px) {
  /* Room above the point for the strands to converge; the label sits
     beside the point so the thread can continue straight down. */
  .st-pinch { padding-top: 170px; padding-bottom: 120px; }
  .st-pinch-label {
    position: absolute;
    left: calc(50% + 28px);
    top: calc(170px + 22px);
    margin: 0;
    text-align: left;
    white-space: nowrap;
  }
}


/* ============================================
   4. CHAPTERS + LAYOUTS
   ============================================ */

.st-chapter {
  padding-block: clamp(var(--sp-12), 8vw, 140px);
  scroll-margin-top: calc(var(--st-nav-h) + var(--sp-2));
}

.st-chapter:focus { outline: none; }

.st-chapter-inner {
  width: var(--st-wrap);
  margin: 0 auto;
  display: grid;
  gap: var(--sp-8);
}

.st-heading {
  font-family: var(--font-display);
  font-size: clamp(2rem, 1.35rem + 2.5vw, 3.25rem);
  font-weight: 400;
  letter-spacing: -0.02em;
  line-height: 1.1;
  color: var(--text);
  margin-bottom: var(--sp-6);
  text-wrap: balance;
}

.st-body p {
  font-size: clamp(1.0625rem, 1rem + 0.25vw, 1.1875rem);
  line-height: 1.75;
  color: var(--text-secondary);
  /* Wide enough to use the column, short enough to read: about 75
     characters a line */
  max-width: 75ch;
  text-wrap: pretty;
}

.st-body p + p { margin-top: var(--sp-4); }

.st-body a,
.st-quote a,
.st-figure figcaption a {
  color: var(--accent-strong);
  text-decoration: underline;
  text-decoration-color: color-mix(in srgb, var(--accent) 55%, transparent);
  text-underline-offset: 0.2em;
}

.st-body a:hover,
.st-quote a:hover { color: var(--accent-deep); }

/* What a chapter or a testing round taught us (chapter.insight,
   round.insight). Labelled Insight unless the content says Finding
   or Impact. */
.st-insight {
  max-width: 75ch;
  margin-top: var(--sp-6);
  padding: var(--sp-4) var(--sp-6);
  border-radius: var(--r-md);
  background: var(--accent-subtle);
  border: 1px solid color-mix(in srgb, var(--accent) 24%, transparent);
  font-size: clamp(1.0625rem, 1rem + 0.25vw, 1.1875rem);
  font-weight: 500;
  line-height: 1.6;
  color: var(--text);
  text-wrap: pretty;
}

.st-insight-label {
  display: block;
  margin-bottom: var(--sp-1);
  font-size: 1rem;
  font-weight: 600;
  letter-spacing: 0.08em;
  text-transform: uppercase;
  color: var(--accent-strong);
}

.st-round-insight {
  max-width: 30rem;
  margin-top: var(--sp-4);
}

.st-quote {
  margin-top: var(--sp-8);
  padding-left: clamp(var(--sp-4), 3vw, var(--sp-8));
  border-left: 3px solid var(--accent);
}

.st-quote > p:first-child {
  font-family: var(--font-display);
  font-style: italic;
  font-size: clamp(1.625rem, 1.15rem + 2vw, 2.75rem);
  line-height: 1.25;
  color: var(--text);
  text-wrap: pretty;
}

.st-quote-cite {
  margin-top: var(--sp-4);
  font-size: 1rem;
  font-weight: 600;
  letter-spacing: 0.08em;
  text-transform: uppercase;
  color: var(--text-muted);
}

.st-media {
  display: grid;
  gap: var(--sp-6);
}

/* Several visuals in one chapter stack, with the chapter's spacing */
.st-visuals {
  display: grid;
  gap: clamp(var(--sp-8), 5vw, var(--sp-16));
}

/* One screen in a phone frame (media item with frame: 'phone') */
.st-figure--phone .st-phone { margin-inline: auto; }

@media (max-width: 599px) {
  .st-figure--phone .st-phone { height: auto; width: min(260px, 72%); }
}

/* --- Two columns from 900px; everything stacks below
   (headline, body, then image) --- */
@media (min-width: 900px) {
  /* The text column is narrower here, so long insight headlines
     step down a size instead of stacking six lines deep. */
  .st-layout-text-left .st-heading,
  .st-layout-text-right .st-heading,
  .st-layout-rounds .st-heading {
    font-size: clamp(2rem, 1.4rem + 1.3vw, 2.75rem);
  }

  .st-layout-text-left .st-chapter-inner,
  .st-layout-text-right .st-chapter-inner {
    column-gap: clamp(var(--sp-8), 5vw, 88px);
    row-gap: var(--sp-12);
    align-items: center;
  }

  .st-layout-text-left .st-chapter-inner {
    grid-template-columns: minmax(0, 5fr) minmax(0, 7fr);
    grid-template-areas: "text media" "visual visual";
  }

  .st-layout-text-right .st-chapter-inner {
    grid-template-columns: minmax(0, 7fr) minmax(0, 5fr);
    grid-template-areas: "media text" "visual visual";
  }

  .st-layout-text-left .st-text,
  .st-layout-text-right .st-text { grid-area: text; }
  .st-layout-text-left .st-media,
  .st-layout-text-right .st-media { grid-area: media; }
  .st-layout-text-left .st-visuals,
  .st-layout-text-right .st-visuals { grid-area: visual; }

  /* A phone screen is narrow, so its text takes the wider column. */
  .st-layout-text-left:has(.st-media .st-figure--phone) .st-chapter-inner {
    grid-template-columns: minmax(0, 7fr) minmax(0, 5fr);
  }
  .st-layout-text-right:has(.st-media .st-figure--phone) .st-chapter-inner {
    grid-template-columns: minmax(0, 5fr) minmax(0, 7fr);
  }

  /* A chapter with a visual and no images: the visual takes the
     image's side of the split. */
  .st-visual-only.st-layout-text-left .st-visuals,
  .st-visual-only.st-layout-text-right .st-visuals { grid-area: media; }
}

/* Section text always starts on the column's left edge, centered and
   showcase layouts included, so every case study reads the same way. */

.st-layout-wide .st-text,
.st-layout-quote .st-text,
.st-layout-centered .st-text,
.st-layout-showcase .st-text { max-width: 52rem; } /* fits a 75ch paragraph */

.st-layout-wide .st-chapter-inner,
.st-layout-quote .st-chapter-inner,
.st-layout-centered .st-chapter-inner,
.st-layout-showcase .st-chapter-inner { row-gap: clamp(var(--sp-8), 5vw, var(--sp-16)); }

.st-layout-centered .st-media {
  width: min(880px, 100%);
  margin-inline: auto;
}

.st-layout-showcase .st-heading {
  font-size: clamp(2.25rem, 1.5rem + 3vw, 4rem);
}

@media (min-width: 700px) {
  .st-layout-showcase .st-media:not(.st-media--pairs) {
    grid-template-columns: 1fr 1fr;
    align-items: start;
  }
  .st-layout-showcase .st-media:not(.st-media--pairs) .st-figure:first-child { grid-column: 1 / -1; }
  .st-layout-showcase .st-media:not(.st-media--pairs) .st-figure:nth-child(2):last-child {
    grid-column: 1 / -1;
    justify-self: center;
    width: min(520px, 100%);
  }
}


/* ============================================
   5. FIGURES + PLACEHOLDERS
   ============================================ */

.st-figure { margin: 0; }

.st-frame {
  border-radius: var(--r-lg);
  overflow: hidden;
  background: var(--surface-raised);
  border: 1px solid var(--border-subtle);
  box-shadow: var(--shadow-card);
  will-change: transform;
}

.st-frame img {
  width: 100%;
  height: 100%;
  object-fit: cover;
}

.st-figure figcaption {
  margin-top: var(--sp-3);
  font-size: 1rem;
  line-height: 1.55;
  color: var(--text-muted);
  text-wrap: pretty;
}

.st-placeholder {
  display: grid;
  place-items: center;
  width: 100%;
  padding: var(--sp-4);
  border-radius: var(--r-lg);
  border: 2px dashed color-mix(in srgb, var(--accent-strong) 55%, transparent);
  background:
    repeating-linear-gradient(135deg, var(--accent-subtle) 0 12px, transparent 12px 24px),
    var(--surface);
  color: var(--accent-strong);
  font-size: 1rem;
  font-weight: 600;
  letter-spacing: 0.04em;
  text-align: center;
}


/* ============================================
   6. VISUAL: IDEA SCATTER
   Cards sit in normal flow (so they can never overlap text), with
   a small deterministic tilt. On entry they fly out from the
   centre. Phones show 8, tablets 18, desktop all.
   ============================================ */

.st-scatter {
  display: flex;
  flex-wrap: wrap;
  justify-content: center;
  gap: var(--sp-4);
  list-style: none;
  padding: var(--sp-6) 0;
}

.st-idea {
  font-size: 1rem;
  line-height: 1.3;
  padding: 0.65rem 1rem;
  border-radius: var(--r-md);
  background: var(--paper);
  border: 1px solid color-mix(in srgb, var(--accent) 26%, transparent);
  box-shadow: var(--shadow-sm);
  color: var(--text);
  transform: translate(var(--jx), var(--jy)) rotate(var(--r));
}

.st-idea:nth-child(4n + 1) { background: var(--accent-soft); }

.st-motion .st-scatter:not(.is-scattered) .st-idea { opacity: 0; }

.st-motion .st-scatter.is-ready:not(.is-scattered) .st-idea {
  transform: translate(var(--fx, 0), var(--fy, 0)) scale(0.55);
}

.st-motion .st-scatter.is-scattered .st-idea {
  opacity: 1;
  transform: translate(var(--jx), var(--jy)) rotate(var(--r));
  transition:
    transform 1.2s var(--st-ease) calc(var(--d) * 30ms),
    opacity 0.5s ease calc(var(--d) * 30ms);
}

@media (max-width: 1099px) { .st-hide-tablet { display: none; } }
@media (max-width: 599px)  { .st-hide-phone  { display: none; } }


/* ============================================
   7. VISUAL: IMPACT/RISK FUNNEL
   ============================================ */

.st-funnel {
  display: grid;
  gap: var(--sp-8);
  margin: 0;
}

.st-matrix-wrap {
  display: grid;
  grid-template-columns: auto minmax(0, 1fr);
  grid-template-areas: "y matrix" ". x";
  gap: var(--sp-2) var(--sp-3);
}

.st-matrix-col { grid-area: matrix; }

.st-axis {
  font-size: 1rem;
  font-weight: 600;
  color: var(--text-secondary);
  white-space: nowrap;
}

.st-axis--y {
  grid-area: y;
  display: flex;
  flex-direction: column;
  align-items: center;
  gap: var(--sp-2);
  justify-self: center;
  align-self: center;
}

/* Only the word is turned to read bottom-to-top; the arrow stays
   upright so it points up, the direction risk increases. */
.st-axis-word {
  writing-mode: vertical-rl;
  transform: rotate(180deg);
}

.st-axis--x {
  grid-area: x;
  justify-self: end;
}

.st-quads {
  display: grid;
  grid-template-columns: 1fr 1fr;
  font-size: 1rem;
  color: var(--text-muted);
}

.st-quads span { padding: var(--sp-1) var(--sp-3); }
.st-quads span:first-child { text-align: right; }
.st-quads--top { margin-bottom: var(--sp-1); }
.st-quads--bottom { margin-top: var(--sp-1); }
.st-quads--top span:last-child { color: var(--accent-strong); font-weight: 600; }

.st-matrix {
  position: relative;
  aspect-ratio: 16 / 11;
  border-radius: var(--r-lg);
  border: 1px solid var(--border);
  background:
    linear-gradient(var(--border), var(--border)) center / 1px 100% no-repeat,
    linear-gradient(var(--border), var(--border)) center / 100% 1px no-repeat,
    linear-gradient(to top right, transparent 50%, var(--accent-subtle)),
    var(--paper);
}

.st-dot {
  --size: 14px;
  position: absolute;
  left: calc(var(--x) * (100% - 36px) + 18px);
  bottom: calc(var(--y) * (100% - 36px) + 18px);
  width: var(--size);
  height: var(--size);
  translate: -50% 50%;
  border-radius: 50%;
  background: color-mix(in srgb, var(--accent) 55%, transparent);
  display: grid;
  place-items: center;
  transition:
    width 0.6s var(--st-ease), height 0.6s var(--st-ease),
    opacity 0.6s ease, background 0.6s ease, scale 0.6s var(--st-ease);
}

.st-dot-num {
  font-size: 1rem;
  font-weight: 700;
  line-height: 1;
  color: var(--text-on-accent);
  opacity: 0;
  transition: opacity 0.4s ease 0.2s;
}

.st-funnel.is-narrowed .st-dot:not(.is-short) {
  opacity: 0.2;
  scale: 0.7;
}

.st-funnel.is-narrowed .st-dot.is-short {
  --size: 32px;
  /* Text-safe accent, so the white number inside passes AA */
  background: var(--accent-strong);
  box-shadow: 0 0 0 4px var(--accent-glow);
  z-index: 1;
}

.st-funnel.is-narrowed .st-dot-num { opacity: 1; }

.st-motion .st-funnel .st-dot { opacity: 0; scale: 0; }
.st-motion .is-in .st-funnel .st-dot,
.st-motion .st-funnel.is-narrowed .st-dot {
  opacity: 1;
  scale: 1;
  transition-delay: calc(var(--d) * 22ms);
}
.st-motion .st-funnel.is-narrowed .st-dot:not(.is-short) { opacity: 0.2; scale: 0.7; transition-delay: 0s; }

.st-funnel-side {
  display: grid;
  gap: var(--sp-4);
}

.st-steps {
  display: flex;
  flex-wrap: wrap;
  align-items: center;
  gap: var(--sp-3) var(--sp-4);
  list-style: none;
}

.st-step {
  display: flex;
  align-items: baseline;
  gap: var(--sp-2);
  font-size: 1rem;
  color: var(--text-muted);
  transition: color 0.5s ease;
}

.st-step strong {
  font-family: var(--font-display);
  font-size: 2.5rem;
  font-weight: 500;
  line-height: 1;
  font-variant-numeric: lining-nums;
  color: var(--text-secondary);
  transition: color 0.5s ease;
}

.st-step-arrow { color: var(--text-muted); font-size: 1rem; }

.st-funnel:not(.is-narrowed) .st-step[data-step="0"] strong,
.st-funnel.is-narrowed .st-step[data-step="1"] strong { color: var(--accent-strong); }
.st-funnel:not(.is-narrowed) .st-step[data-step="0"],
.st-funnel.is-narrowed .st-step[data-step="1"] { color: var(--text); }

.st-shortlist-title {
  font-size: 1rem;
  font-weight: 600;
  letter-spacing: 0.08em;
  text-transform: uppercase;
  color: var(--accent-strong);
}

.st-shortlist {
  display: grid;
  gap: var(--sp-2) var(--sp-6);
  list-style: none;
  transition: opacity 0.6s ease;
}

@media (min-width: 600px) {
  .st-shortlist { grid-template-columns: 1fr 1fr; }
}

.st-funnel:not(.is-narrowed) .st-shortlist { opacity: 0.45; }

.st-shortlist li {
  display: flex;
  align-items: center;
  gap: var(--sp-3);
  font-size: 1rem;
  line-height: 1.35;
  color: var(--text);
}

.st-dot-key {
  flex: none;
  width: 30px;
  height: 30px;
  display: grid;
  place-items: center;
  border-radius: 50%;
  background: var(--accent-strong);
  color: var(--text-on-accent);
  font-size: 1rem;
  font-weight: 700;
}

@media (max-width: 599px) {
  /* Too small for numbered dots: the pattern carries the chart and
     the list below carries the names. */
  .st-dot { --size: 10px; }
  .st-funnel.is-narrowed .st-dot.is-short { --size: 16px; }
  .st-dot-num { display: none; }
  .st-matrix { aspect-ratio: 1 / 1; }
  .st-quads span { padding: var(--sp-1) var(--sp-2); }
}


/* ============================================
   8. VISUAL: FEATURE CARDS
   Four across on desktop, two on tablets, and on phones one per
   row with the screen beside the text.
   ============================================ */

.st-features {
  display: grid;
  gap: var(--sp-6);
  list-style: none;
}

@media (min-width: 600px) { .st-features { grid-template-columns: 1fr 1fr; } }
@media (min-width: 1100px) {
  .st-features { grid-template-columns: repeat(4, minmax(0, 1fr)); }
  .st-features--n5 { grid-template-columns: repeat(5, minmax(0, 1fr)); gap: var(--sp-4); }
}

.st-feature {
  display: grid;
  align-content: start;
  gap: var(--sp-3);
  padding: var(--sp-4);
  border-radius: var(--r-xl);
  background: var(--surface);
  border: 1px solid var(--border-subtle);
}

.st-feature-media {
  border-radius: var(--r-lg);
  overflow: hidden;
  background: var(--surface-raised);
  aspect-ratio: 2 / 3;
}

.st-feature-media img {
  width: 100%;
  height: 100%;
  object-fit: cover;
  object-position: top;
}

.st-feature-title {
  font-size: 1.125rem;
  font-weight: 600;
  line-height: 1.3;
  color: var(--text);
}

.st-feature p {
  font-size: 1rem;
  line-height: 1.55;
  color: var(--text-secondary);
}

@media (max-width: 599px) {
  .st-feature {
    grid-template-columns: 104px minmax(0, 1fr);
    grid-template-areas: "media title" "media text";
    align-items: start;
    column-gap: var(--sp-4);
  }
  .st-feature-media { grid-area: media; }
  .st-feature-title { grid-area: title; }
  .st-feature p { grid-area: text; }
}


/* ============================================
   9. VISUAL: PINNED PHONE
   From 900px the phone stays put while the rounds scroll past and
   its screen changes. Below that, each round shows its own phone,
   stacked and clearly labeled.
   ============================================ */

.st-rounds {
  list-style: none;
  display: grid;
  gap: var(--sp-12);
}

.st-round-kicker {
  font-size: 1rem;
  font-weight: 600;
  letter-spacing: 0.1em;
  text-transform: uppercase;
  color: var(--accent-strong);
}

.st-round-label {
  font-family: var(--font-display);
  font-size: clamp(2rem, 1.5rem + 2vw, 3rem);
  line-height: 1.1;
  color: var(--text);
  margin-top: var(--sp-1);
}

.st-round-text {
  margin-top: var(--sp-3);
  font-size: 1.0625rem;
  line-height: 1.7;
  color: var(--text-secondary);
  max-width: 30rem;
}

.st-phone {
  height: min(560px, 68svh);
  aspect-ratio: 9 / 19;
  padding: 10px;
  border-radius: 44px;
  background: var(--shade);
  border: 1px solid color-mix(in srgb, var(--white) 14%, transparent);
  box-shadow: var(--shadow-card), 0 30px 60px color-mix(in srgb, var(--shade) 18%, transparent);
}

.st-phone-screen {
  position: relative;
  height: 100%;
  border-radius: 34px;
  overflow: hidden;
  background: var(--paper);
}

.st-phone-screen img {
  width: 100%;
  height: 100%;
  object-fit: cover;       /* fills the screen top to bottom */
  object-position: top center;
}

.st-phone-screen .st-placeholder {
  height: 100%;
  border-radius: 34px;
  aspect-ratio: auto !important;
}

/* One small frame per step on phones and tablets (the pinned stage
   takes over from 900px). */
.st-frame-inline { margin-top: var(--sp-6); }
.st-phone.st-frame-inline { height: auto; width: min(240px, 70%); }

/* What sits inside any frame's screen */
.st-screen-media { width: 100%; height: 100%; }
.st-screen-media img {
  width: 100%;
  height: 100%;
  object-fit: cover;
  object-position: top center;
}
.st-photo-screen .st-screen-media img { object-fit: contain; object-position: center; }
.st-screen-media[data-fit="cover"] img { object-fit: cover; object-position: center; }
.st-screen-media[data-fit="contain"] img { object-fit: contain; object-position: center; }

/* Browser window: for websites */
.st-browser {
  width: 100%;
  display: flex;
  flex-direction: column;
  border-radius: var(--r-lg);
  overflow: hidden;
  background: var(--surface);
  border: 1px solid var(--border);
  box-shadow: var(--shadow-card), 0 30px 60px color-mix(in srgb, var(--shade) 14%, transparent);
}

.st-browser-bar {
  display: flex;
  align-items: center;
  gap: 6px;
  height: 34px;
  padding: 0 12px;
  flex-shrink: 0;
  background: var(--surface-raised);
  border-bottom: 1px solid var(--border-subtle);
}

.st-browser-bar > span:not(.st-browser-url) {
  width: 10px;
  height: 10px;
  border-radius: 50%;
  background: color-mix(in srgb, var(--text-muted) 35%, transparent);
}

.st-browser-url {
  display: flex;
  align-items: center;
  flex: 0 1 60%;
  height: 22px;
  margin-left: 10px;
  padding: 0 12px;
  border-radius: var(--r-pill);
  background: var(--bg);
  font-size: 0.8125rem;
  color: var(--text-muted);
  white-space: nowrap;
  overflow: hidden;
  text-overflow: ellipsis;
}

.st-browser-screen {
  position: relative;
  aspect-ratio: 16 / 10;
  overflow: hidden;
  background: var(--shade);
}

/* Photo frame: for physical work and illustrations */
.st-photo {
  width: 100%;
  border-radius: var(--r-xl);
  overflow: hidden;
  background: var(--surface-raised);
  border: 1px solid var(--border-subtle);
  box-shadow: var(--shadow-card);
}

.st-photo-screen {
  position: relative;
  aspect-ratio: 4 / 3;
  overflow: hidden;
}

.st-browser-screen .st-placeholder,
.st-photo-screen .st-placeholder {
  height: 100%;
  aspect-ratio: auto !important;
  border-radius: 0;
}

.st-screen {
  position: absolute;
  inset: 0;
  opacity: 0;
  visibility: hidden;
  pointer-events: none;
  transition: opacity 0.6s ease, visibility 0s linear 0.6s;
}

.st-screen.is-active {
  opacity: 1;
  visibility: visible;
  pointer-events: auto;
  transition: opacity 0.6s ease, visibility 0s;
}

/* --- Live prototype inside the phone ---
   Rendered at 390px (the width it was designed for) and scaled to
   the frame. Inert until "Try the prototype" is pressed. */
.st-embed {
  --embed-scale: 0.68;
  position: relative;
  width: 100%;
  height: 100%;
  overflow: hidden;
  background: var(--paper);
}

.st-embed iframe {
  position: absolute;
  top: 0;
  left: 0;
  width: var(--embed-w, 390px);
  height: calc(100% / var(--embed-scale));
  border: 0;
  transform: scale(var(--embed-scale));
  transform-origin: 0 0;
  pointer-events: none;
}

.st-embed.is-live iframe { pointer-events: auto; }

.st-embed-start {
  position: absolute;
  left: 50%;
  bottom: var(--sp-6);
  transform: translateX(-50%);
  display: inline-flex;
  align-items: center;
  gap: var(--sp-2);
  min-height: 44px;
  padding: 0 var(--sp-6);
  border: 0;
  border-radius: var(--r-pill);
  background: var(--accent-strong);
  color: var(--text-on-accent);
  font: inherit;
  font-size: 1rem;
  font-weight: 600;
  white-space: nowrap;
  box-shadow: var(--shadow-card);
  transition: background var(--t-base), opacity var(--t-base);
}

.st-embed-start:hover { background: var(--accent-deep); }
.st-embed.is-live .st-embed-start { opacity: 0; pointer-events: none; }

/* In use: the device frame grows a little and glows in the project
   colour, so it's clear the prototype is live (story.js setLive). */
.st-phone,
.st-browser {
  transition: transform 0.5s var(--st-ease), box-shadow 0.5s ease;
  /* Grow mostly upward, clear of the label underneath. */
  transform-origin: 50% 85%;
}

.st-phone.is-live,
.st-browser.is-live {
  position: relative;
  z-index: 2;
  box-shadow:
    var(--shadow-card),
    0 0 0 3px color-mix(in srgb, var(--accent) 60%, transparent),
    0 0 56px 10px color-mix(in srgb, var(--accent) 38%, transparent);
}

.st-motion .st-phone.is-live { transform: scale(1.06); }
.st-motion .st-browser.is-live { transform: scale(1.03); }
.st-motion .st-phone.is-live,
.st-motion .st-browser.is-live {
  animation: st-live-glow 2.4s ease-in-out 0.5s infinite;
}

@keyframes st-live-glow {
  50% {
    box-shadow:
      var(--shadow-card),
      0 0 0 3px color-mix(in srgb, var(--accent) 75%, transparent),
      0 0 72px 16px color-mix(in srgb, var(--accent) 48%, transparent);
  }
}

/* --- Prototypes: live prototypes side by side ---
   The web app takes the wide column, the phone sits beside it; both
   stack on smaller screens. */
.st-protos {
  display: grid;
  gap: var(--sp-12) clamp(var(--sp-8), 4vw, var(--sp-12));
  align-items: end;
  width: min(1100px, 100%);
  margin-inline: auto;
}

.st-proto {
  display: flex;
  flex-direction: column;
  align-items: center;
  gap: var(--sp-6);
  margin: 0;
  min-width: 0;
}

.st-proto--browser { align-items: stretch; }
.st-proto--phone .st-phone { height: min(520px, 64svh); }

.st-proto-caption {
  display: flex;
  flex-wrap: wrap;
  align-items: baseline;
  justify-content: center;
  gap: 0 var(--sp-3);
  text-align: center;
}

.st-proto-label {
  font-size: 1rem;
  font-weight: 600;
  letter-spacing: 0.08em;
  text-transform: uppercase;
  color: var(--text);
}

.st-proto-detail {
  font-size: 1rem;
  color: var(--text-muted);
}

.st-proto-caption .st-round-link {
  flex-basis: 100%;
  justify-content: center;
  margin-top: 0;
}

@media (min-width: 900px) {
  .st-protos {
    grid-template-columns: minmax(0, 1fr) auto;
  }
}

@media (max-width: 599px) {
  .st-proto--phone .st-phone { height: auto; width: min(260px, 72%); }
  /* A desktop web app is too small to use at phone width: show it as
     a preview, and let "Open in a new tab" do the work. */
  .st-proto--browser .st-embed-start { display: none; }
}

.st-round-points {
  list-style: none;
  display: grid;
  gap: var(--sp-2);
  margin-top: var(--sp-3);
  max-width: 30rem;
}

.st-round-points li {
  position: relative;
  padding-left: var(--sp-6);
  font-size: 1.0625rem;
  line-height: 1.6;
  color: var(--text-secondary);
}

.st-round-points li::before {
  content: '';
  position: absolute;
  left: 4px;
  top: 0.6em;
  width: 7px;
  height: 7px;
  border-radius: 50%;
  background: var(--accent);
}

.st-round-link {
  display: inline-flex;
  align-items: center;
  gap: var(--sp-2);
  min-height: 44px;
  margin-top: var(--sp-2);
  font-size: 1rem;
  font-weight: 600;
  color: var(--accent-strong);
  text-decoration: underline;
  text-decoration-color: color-mix(in srgb, var(--accent) 55%, transparent);
  text-underline-offset: 0.2em;
}

.st-round-link:hover { color: var(--accent-deep); }

.st-rounds-stage { display: none; }

@media (min-width: 900px) {
  .st-layout-rounds .st-chapter-inner {
    grid-template-columns: minmax(0, 6fr) minmax(0, 5fr);
    grid-template-areas: "text stage" "rounds stage";
    column-gap: clamp(var(--sp-8), 5vw, 88px);
    row-gap: 0;
  }
  .st-layout-rounds .st-text { grid-area: text; padding-bottom: 10svh; }
  .st-rounds { grid-area: rounds; gap: 0; }
  .st-round {
    min-height: 70svh;
    display: flex;
    flex-direction: column;
    justify-content: center;
  }
  /* Steps away from the reading line fall back by colour rather than
     opacity, so their text still meets AA contrast (4.5:1). */
  .st-round > * { transition: color 0.5s ease; }
  .st-round:not(.is-active) .st-round-kicker,
  .st-round:not(.is-active) .st-round-label,
  .st-round:not(.is-active) .st-round-text,
  .st-round:not(.is-active) .st-round-points li { color: var(--text-muted); }
  .st-frame-inline { display: none; }

  /* Wider frames get the wider column, and a fixed height so the
     stage can sit centered on screen. */
  .st-frame-browser .st-chapter-inner,
  .st-frame-photo .st-chapter-inner {
    grid-template-columns: minmax(0, 5fr) minmax(0, 7fr);
  }
  .st-frame-browser { --stage-h: calc(min(420px, 52svh) + 34px); }
  .st-frame-photo { --stage-h: min(500px, 58svh); }
  .st-frame-browser .st-rounds-stage .st-browser-screen { aspect-ratio: auto; height: min(420px, 52svh); }
  .st-frame-photo .st-rounds-stage .st-photo-screen { aspect-ratio: auto; height: min(500px, 58svh); }
  .st-frame-browser .st-rounds-stage,
  .st-frame-photo .st-rounds-stage {
    top: calc(var(--st-nav-h) + (100svh - var(--st-nav-h) - var(--stage-h)) / 2 - 24px);
  }

  .st-rounds-stage {
    grid-area: stage;
    display: flex;
    flex-direction: column;
    align-items: center;
    gap: var(--sp-4);
    position: sticky;
    top: calc(var(--st-nav-h) + (100svh - var(--st-nav-h) - min(560px, 68svh)) / 2 - 24px);
    align-self: start;
  }

  .st-stage-label {
    font-size: 1rem;
    font-weight: 600;
    letter-spacing: 0.08em;
    text-transform: uppercase;
    color: var(--text-muted);
  }
}


/* ============================================
   10. VISUAL: GALLERY
   ============================================ */

.st-gallery {
  display: grid;
  gap: var(--sp-6);
}

@media (min-width: 700px) {
  .st-gallery:not(.st-gallery--pairs) { grid-template-columns: 1fr 1fr; align-items: start; }
  .st-gallery:not(.st-gallery--pairs) .st-figure:first-child { grid-column: 1 / -1; }
}

/* Side-by-side pairs (gallery columns: 2, chapter mediaColumns: 2).
   Each figure's flex-grow is its aspect ratio (set inline), so both
   images in a row come out the same height. Phones stack them. */
.st-pair {
  display: flex;
  flex-direction: column;
  gap: var(--sp-6);
}

.st-pair + .st-pair { margin-top: var(--sp-6); }

@media (min-width: 700px) {
  .st-pair { flex-direction: row; align-items: flex-start; }
}

@media (max-width: 699px) {
  .st-pair > .st-figure { flex: none !important; }
}

/* Video frame + its play/pause button */
.st-frame { position: relative; }

.st-video {
  display: block;
  width: 100%;
  height: 100%;
  object-fit: cover;
  background: var(--surface-raised);
}

.st-video-toggle {
  position: absolute;
  right: var(--sp-3);
  bottom: var(--sp-3);
  width: 44px;
  height: 44px;
  display: grid;
  place-items: center;
  border: 0;
  border-radius: 50%;
  background: color-mix(in srgb, var(--shade) 72%, transparent);
  color: var(--white);
  font-size: 0.95rem;
  transition: background var(--t-base);
}

.st-video-toggle:hover { background: var(--shade); }
.st-video-toggle[hidden] { display: none; }


/* ============================================
   11. INTERLUDE (HALFWAY)
   Full screen, opaque, and the line glows as it arrives.
   ============================================ */

.st-interlude {
  position: relative;
  z-index: 2;
  min-height: 100svh;
  display: grid;
  place-items: center;
  padding: calc(var(--st-nav-h) + var(--sp-8)) var(--st-gutter) var(--sp-16);
  text-align: center;
  background:
    radial-gradient(60% 50% at 50% 45%, var(--accent-subtle), transparent 70%),
    var(--bg);
  scroll-margin-top: 0;
}

.st-interlude:focus { outline: none; }

.st-interlude-inner {
  display: grid;
  justify-items: center;
  gap: var(--sp-4);
  width: min(720px, 100%);
}

.st-interlude-art {
  width: min(520px, 100%);
  height: auto;
  overflow: visible;
  margin-bottom: var(--sp-6);
}

.st-interlude-art path {
  fill: none;
  stroke-linejoin: round;
}

/* Paths use pathLength="100": a 100-long dash covers all four sides.
   (Dashes are in path units, so no non-scaling-stroke here; that
   measured them in screen pixels and left one side undrawn.) */
.st-art-done {
  stroke: var(--accent);
  stroke-width: 2;
  fill: var(--accent-subtle) !important;
  stroke-dasharray: 100 100;
  stroke-dashoffset: 0;
}

.st-art-next {
  stroke: color-mix(in srgb, var(--text-muted) 55%, transparent);
  stroke-width: 1.25;
  stroke-dasharray: 2 2;
}

.st-art-point { fill: var(--bg); stroke: var(--text-muted); stroke-width: 2; }
.st-art-point.is-done { fill: var(--accent); stroke: var(--accent); }
.st-art-point.is-here { filter: drop-shadow(0 0 8px var(--accent)); }

.st-motion .st-interlude .st-art-done {
  stroke-dashoffset: 100;
  transition: stroke-dashoffset 1.6s var(--st-ease) 0.2s;
}
.st-motion .st-interlude.is-in .st-art-done { stroke-dashoffset: 0; }

.st-interlude .st-eyebrow { justify-content: center; margin-bottom: 0; }

.st-interlude-title {
  font-family: var(--font-display);
  font-size: clamp(3rem, 2rem + 5vw, 6rem);
  font-weight: 400;
  letter-spacing: -0.02em;
  line-height: 1;
  color: var(--text);
}

.st-interlude-line {
  font-size: clamp(1.125rem, 1rem + 0.7vw, 1.5rem);
  line-height: 1.5;
  color: var(--text-secondary);
}


/* ============================================
   12. METRICS, REFLECTION, NEXT STORY
   Opaque panels: the line runs behind them.
   ============================================ */

.st-panel {
  position: relative;
  z-index: 2;
  width: var(--st-wrap);
  margin: 0 auto var(--sp-8);
  padding: clamp(var(--sp-8), 5vw, var(--sp-16));
  border-radius: var(--r-2xl);
  background: var(--surface);
  border: 1px solid var(--border-subtle);
}

.st-metrics-section { margin-top: clamp(var(--sp-8), 6vw, var(--sp-16)); }

.st-panel-title {
  font-family: var(--font-display);
  font-size: clamp(2rem, 1.5rem + 2vw, 3rem);
  font-weight: 400;
  letter-spacing: -0.02em;
  line-height: 1.1;
  color: var(--text);
  margin-bottom: var(--sp-8);
}

.st-reflection p {
  font-size: clamp(1.0625rem, 1rem + 0.3vw, 1.25rem);
  line-height: 1.7;
  color: var(--text-secondary);
}

.st-reflection p + p { margin-top: var(--sp-4); }

.st-metrics {
  display: grid;
  grid-template-columns: repeat(2, minmax(0, 1fr));
  gap: var(--sp-8) var(--sp-6);
  list-style: none;
}

@media (min-width: 900px) {
  .st-metrics { grid-template-columns: repeat(3, minmax(0, 1fr)); }
}

.st-metric-value {
  font-family: var(--font-display);
  font-size: clamp(2.75rem, 2rem + 3vw, 4.5rem);
  font-weight: 400;
  letter-spacing: -0.02em;
  line-height: 1;
  font-variant-numeric: lining-nums tabular-nums;
  color: var(--accent-strong);
}

.st-metric-label {
  margin-top: var(--sp-2);
  font-size: 1rem;
  line-height: 1.45;
  color: var(--text-secondary);
}

.st-metric-detail {
  margin-top: var(--sp-1);
  font-size: 1rem;
  color: var(--text-muted);
}

.st-metrics--compact {
  margin-top: var(--sp-8);
  padding-top: var(--sp-6);
  border-top: 1px solid var(--border);
}

.st-metrics--compact .st-metric-value { font-size: clamp(2rem, 1.6rem + 1.5vw, 2.75rem); }

.st-further-intro {
  margin-top: calc(var(--sp-4) * -1);
  margin-bottom: var(--sp-6);
  font-size: clamp(1.0625rem, 1rem + 0.3vw, 1.25rem);
  line-height: 1.7;
  color: var(--text-secondary);
}

.st-further-list {
  list-style: none;
  display: grid;
  gap: 0;
  border-top: 1px solid var(--border);
}

@media (min-width: 900px) {
  .st-further-list { grid-template-columns: 1fr 1fr; column-gap: var(--sp-8); }
}

.st-further-link {
  display: grid;
  grid-template-columns: 1fr auto;
  align-items: center;
  column-gap: var(--sp-3);
  min-height: 44px;
  padding: var(--sp-4) 0;
  border-bottom: 1px solid var(--border);
  color: var(--text);
  transition: color var(--t-base);
}

.st-further-link:hover { color: var(--accent-strong); }

.st-further-title {
  font-size: 1.0625rem;
  font-weight: 600;
  line-height: 1.4;
}

.st-further-meta {
  grid-column: 1;
  margin-top: var(--sp-1);
  font-size: 1rem;
  color: var(--text-muted);
}

.st-further-link i {
  grid-column: 2;
  grid-row: 1 / span 2;
  color: var(--accent-strong);
  font-size: 0.875rem;
}

.st-next {
  position: relative;
  z-index: 2;
  width: min(640px, 100% - var(--st-gutter) * 2);
  margin: clamp(var(--sp-16), 8vw, 120px) auto clamp(var(--sp-16), 10vw, 160px);
}

.st-next-title {
  font-size: 1rem;
  font-weight: 600;
  letter-spacing: 0.1em;
  text-transform: uppercase;
  color: var(--text-muted);
  text-align: center;
  margin-bottom: var(--sp-4);
}

.st-next-card {
  display: block;
  width: 100%;
  height: auto;
}
.st-next-card .project-thumb img { view-transition-name: none; }  /* named on click, see js */
.st-next-card .project-thumb { aspect-ratio: 16 / 9; }
.st-next-card .project-body h3 { font-size: 1.25rem; }
.st-next-card .card-subtitle { font-size: 1rem; margin-top: 0; margin-bottom: 0; }


/* ============================================
   13. BACKGROUND LINE (SPINE)
   Desktop only. Two strands share the single-thread stretches, so
   they're faded as a group (no darker overlap).
   ============================================ */

.st-spine {
  display: none;
  position: absolute;
  top: 0;
  left: 0;
  width: 100%;
  z-index: 0;
  overflow: visible;
  pointer-events: none;
}

@media (min-width: 1100px) {
  .st-spine { display: block; }
}

.st-spine-g { opacity: 0.45; }

.st-strand {
  fill: none;
  stroke: var(--accent);
  stroke-width: 2;
  stroke-linecap: round;
  stroke-linejoin: round;
}

.st-spine.is-pulling .st-strand {
  transition: stroke-dashoffset 1.3s var(--st-ease);
}

.st-spine.is-glowing .st-spine-g {
  animation: st-glow 1.9s ease;
}

@keyframes st-glow {
  0%, 100% { opacity: 0.45; filter: none; }
  35% {
    opacity: 1;
    filter: drop-shadow(0 0 4px var(--accent)) drop-shadow(0 0 12px var(--accent));
  }
}


/* ============================================
   14. DESKTOP NAVIGATOR
   A miniature of the same line, one dot per chapter. Labels show
   on hover and keyboard focus; the link text is always there for
   screen readers.
   ============================================ */

.st-navigator {
  display: none;
}

@media (min-width: 1100px) {
  .st-navigator {
    display: block;
    position: fixed;
    left: 24px;
    top: calc(50% + var(--st-nav-h) / 2);
    width: 40px;
    height: min(62vh, 560px);
    transform: translateY(-50%);
    z-index: 850;
    opacity: 0;
    pointer-events: none;
    transition: opacity 0.5s ease;
  }
  .st-navigator.is-visible { opacity: 1; pointer-events: auto; }
}

.st-nav-art {
  position: absolute;
  inset: 0;
  width: 100%;
  height: 100%;
  overflow: visible;
}

.st-nav-art path {
  fill: none;
  vector-effect: non-scaling-stroke;
  stroke-linejoin: round;
}

/* The outline is a quiet guide; the dots are what you click, so they
   stay bright. */
.st-nav-track { stroke: color-mix(in srgb, var(--text-muted) 16%, transparent); stroke-width: 1; }
.st-nav-progress { stroke: color-mix(in srgb, var(--accent) 38%, transparent); stroke-width: 1.25; clip-path: inset(0 0 100% 0); }

.st-nav-list { list-style: none; }

.st-nav-list li {
  position: absolute;
  left: 0;
  top: var(--y);
  width: 40px;
  height: 0;
}

.st-nav-dot {
  position: absolute;
  left: 50%;
  top: 0;
  width: 30px;
  height: 30px;
  margin: -15px 0 0 -15px;
  display: grid;
  place-items: center;
  border-radius: 50%;
}

.st-nav-dot::before {
  content: '';
  width: 10px;
  height: 10px;
  border-radius: 50%;
  background: var(--bg);
  border: 2px solid var(--text-muted);
  transition: all 0.3s ease;
}

.st-nav-dot:hover::before { border-color: var(--accent-strong); }

.st-nav-dot--pinch::before,
.st-nav-dot--interlude::before {
  border-radius: 1px;
  transform: rotate(45deg);
}

.st-nav-dot.is-passed::before {
  border-color: var(--accent);
  background: var(--accent);
}

.st-nav-dot.is-current::before {
  width: 14px;
  height: 14px;
  background: var(--accent);
  border-color: var(--accent);
  box-shadow: 0 0 0 4px var(--accent-glow);
}

.st-nav-label {
  position: absolute;
  left: 36px;
  top: 50%;
  transform: translate(-6px, -50%);
  white-space: nowrap;
  font-size: 1rem;
  line-height: 1.2;
  padding: 0.45rem 0.8rem;
  border-radius: var(--r-pill);
  background: var(--paper);
  border: 1px solid var(--glass-border);
  box-shadow: var(--shadow-sm);
  color: var(--text);
  opacity: 0;
  pointer-events: none;
  transition: opacity 0.2s ease, transform 0.2s ease;
}

.st-nav-num { color: var(--accent-strong); font-weight: 600; font-variant-numeric: tabular-nums; }

.st-nav-dot:hover .st-nav-label,
.st-nav-dot:focus-visible .st-nav-label {
  opacity: 1;
  transform: translate(0, -50%);
}


/* ============================================
   15. MOBILE PROGRESS BAR + CHAPTERS MENU
   Below 1100px. Safe areas respected for notched phones.
   ============================================ */

.st-progress,
.st-chapters-btn { display: none; }
.st-chapters-btn { font: inherit; font-size: 1rem; }

@media (max-width: 1099px) {
  .st-progress {
    display: block;
    position: fixed;
    top: var(--st-nav-h);
    left: 0;
    right: 0;
    height: 3px;
    z-index: 899;
    background: color-mix(in srgb, var(--text-muted) 18%, transparent);
  }

  .st-progress-fill {
    position: absolute;
    inset: 0;
    background: var(--accent);
    transform-origin: left center;
    transform: scaleX(0);
  }

  .st-progress-mark {
    position: absolute;
    top: -3px;
    width: 9px;
    height: 9px;
    margin-left: -4.5px;
    transform: rotate(45deg);
    background: var(--bg);
    border: 2px solid var(--accent-strong);
  }

  .st-chapters-btn {
    display: inline-flex;
    align-items: center;
    gap: var(--sp-2);
    position: fixed;
    left: 50%;
    bottom: calc(var(--sp-4) + env(safe-area-inset-bottom));
    z-index: 905;
    min-height: 48px;
    max-width: calc(100% - 2 * (var(--sp-4) + 56px));
    padding: 0 var(--sp-6);
    border-radius: var(--r-pill);
    border: 1px solid var(--glass-border-hover);
    background: var(--glass-bg);
    backdrop-filter: blur(16px);
    -webkit-backdrop-filter: blur(16px);
    box-shadow: var(--shadow-card);
    color: var(--text);
    font: inherit;
    font-size: 1rem;
    font-weight: 600;
    opacity: 0;
    pointer-events: none;
    transform: translate(-50%, 12px);
    transition: opacity 0.3s ease, transform 0.3s ease;
  }

  .st-chapters-btn.is-visible {
    opacity: 1;
    pointer-events: auto;
    transform: translate(-50%, 0);
  }

  .st-chapters-btn i { color: var(--accent-strong); }
}

.st-chapters-current {
  min-width: 0;
  overflow: hidden;
  text-overflow: ellipsis;
  white-space: nowrap;
  font-weight: 500;
  color: var(--text-muted);
}

.st-chapters-current:empty { display: none; }

.st-chapters {
  width: min(560px, 100% - 32px);
  max-height: min(80dvh, 720px);
  margin: auto;
  padding: 0;
  border: 1px solid var(--glass-border);
  border-radius: var(--r-xl);
  background: var(--bg);
  color: var(--text);
  box-shadow: var(--shadow-hover);
  overscroll-behavior: contain;
}

.st-chapters::backdrop {
  background: color-mix(in srgb, var(--shade) 55%, transparent);
  backdrop-filter: blur(4px);
}

@media (max-width: 599px) {
  /* Bottom sheet on phones */
  .st-chapters {
    width: 100%;
    max-width: 100%;
    margin: auto 0 0;
    border-radius: var(--r-xl) var(--r-xl) 0 0;
    padding-bottom: env(safe-area-inset-bottom);
  }
}

.st-motion .st-chapters[open] { animation: st-rise 0.3s var(--st-ease); }

.st-chapters-head {
  position: sticky;
  top: 0;
  z-index: 1;
  display: flex;
  align-items: center;
  justify-content: space-between;
  padding: var(--sp-3) var(--sp-3) var(--sp-3) var(--sp-6);
  background: var(--bg);
  border-bottom: 1px solid var(--border);
}

.st-chapters-head h2 {
  font-family: var(--font-display);
  font-size: 1.75rem;
  font-weight: 400;
}

.st-chapters-close {
  width: 48px;
  height: 48px;
  display: grid;
  place-items: center;
  border: 0;
  border-radius: 50%;
  background: transparent;
  color: var(--text);
  font-size: 1.25rem;
}

.st-chapters-close:hover { background: var(--accent-subtle); }

.st-menu {
  list-style: none;
  padding: var(--sp-2) var(--sp-3) var(--sp-6);
}

.st-menu-group {
  padding: var(--sp-4) var(--sp-3) var(--sp-2);
  font-size: 1rem;
  font-weight: 600;
  color: var(--text-muted);
}

.st-menu-link {
  display: flex;
  align-items: center;
  gap: var(--sp-3);
  min-height: 48px;
  padding: var(--sp-2) var(--sp-3);
  border-radius: var(--r-md);
  font-size: 1.0625rem;
  color: var(--text);
}

.st-menu-link:hover { background: var(--accent-subtle); }

.st-menu-link[aria-current] {
  background: var(--accent-subtle);
  box-shadow: inset 3px 0 0 var(--accent);
}

.st-menu-num {
  width: 2rem;
  flex: none;
  font-size: 1rem;
  font-weight: 600;
  font-variant-numeric: tabular-nums;
  color: var(--accent-strong);
}

.st-menu-link.is-checkpoint { color: var(--accent-strong); font-weight: 600; }


/* ============================================
   16. PAGE TRANSITIONS
   The homepage card's image frame and the opening card's image
   frame share a view-transition name (set in JS), so one grows into
   the other. Browsers without cross-document transitions, or where
   the story wasn't built in time, get a soft fade instead.
   ============================================ */

/* The morph itself (both directions) is styled in styles.css,
   section 0, since the homepage is the "new" page on the way back. */

@keyframes st-page-in {
  from { opacity: 0; }
  to   { opacity: 1; }
}

.st-fade-in body { animation: st-page-in 0.45s ease-out both; }


/* ============================================
   17. REDUCED MOTION
   Everything visible and in place, the line fully drawn (JS), no
   drift, no scatter flight, no count-up (JS).
   ============================================ */

.st-motion .st-reveal {
  opacity: 0;
  transform: translateY(26px);
  transition:
    opacity 0.9s var(--ease-out) calc(var(--i, 0) * 140ms),
    transform 0.9s var(--st-ease) calc(var(--i, 0) * 140ms);
}

.st-motion .is-in .st-reveal,
.st-motion .st-reveal.is-in {
  opacity: 1;
  transform: none;
}

@media (prefers-reduced-motion: reduce) {
  .st-reveal,
  .st-idea,
  .st-dot,
  .st-frame { transition: none !important; animation: none !important; }
  .st-frame { transform: none !important; }
}


/* ============================================
   ZOOM
   Every story image opens full screen (js: "Zoom" in wire()). If
   the original is bigger than the screen, clicking it again shows it
   at full size to pan around.
   ============================================ */

.st-zoomable { cursor: zoom-in; }

.st-zoomable:focus-visible {
  outline: 3px solid var(--accent-strong);
  outline-offset: 3px;
}

.st-zoom {
  position: fixed;
  inset: 0;
  width: 100%;
  height: 100%;
  max-width: none;
  max-height: none;
  margin: 0;
  padding: 0;
  border: 0;
  overflow: auto;
  overscroll-behavior: contain;
  background: color-mix(in srgb, var(--shade) 92%, transparent);
  color: var(--on-shade);
}

.st-zoom::backdrop { background: transparent; }

.st-zoom[open] { animation: st-zoom-in 0.25s ease; }

@keyframes st-zoom-in { from { opacity: 0; } }

.st-zoom-figure {
  display: flex;
  flex-direction: column;
  align-items: center;
  justify-content: center;
  gap: var(--sp-3);
  width: 100%;
  min-height: 100%;
  margin: 0;
  padding: 72px var(--st-gutter) var(--sp-6);
  cursor: zoom-out;
}

.st-zoom-img {
  display: block;
  max-width: 100%;
  max-height: calc(100svh - 150px);
  width: auto;
  height: auto;
  object-fit: contain;
  border-radius: var(--r-md);
  background: var(--white);
  cursor: zoom-out;
}

.st-zoom.can-grow .st-zoom-img { cursor: zoom-in; }

.st-zoom.is-full .st-zoom-figure {
  width: max-content;
  min-width: 100%;
}

.st-zoom.is-full .st-zoom-img {
  max-width: none;
  max-height: none;
  cursor: zoom-out;
}

.st-zoom-cap {
  max-width: 44rem;
  font-size: 1rem;
  line-height: 1.5;
  text-align: center;
  color: var(--on-shade);
}

.st-zoom.is-full .st-zoom-cap { display: none; }

.st-zoom-close {
  position: fixed;
  top: var(--sp-4);
  right: var(--sp-4);
  z-index: 1;
  display: grid;
  place-items: center;
  width: 44px;
  height: 44px;
  border-radius: 50%;
  font-size: 1.125rem;
  color: var(--on-shade);
  background: color-mix(in srgb, var(--white) 14%, transparent);
  border: 1px solid color-mix(in srgb, var(--white) 30%, transparent);
  cursor: pointer;
}

.st-zoom-close:hover { background: color-mix(in srgb, var(--white) 26%, transparent); }

.st-zoom-close:focus-visible {
  outline: 3px solid var(--on-shade);
  outline-offset: 2px;
}

@media (prefers-reduced-motion: reduce) {
  .st-zoom[open] { animation: none; }
}


/* ============================================
   JOURNEY
   Stops along a line. With motion, the line draws itself and the
   stops pop in one by one when it comes into view. Vertical on
   phones.
   ============================================ */

.st-journey {
  position: relative;
  display: grid;
  grid-template-columns: repeat(var(--n), minmax(0, 1fr));
  gap: var(--sp-4);
  list-style: none;
  padding-top: 30px;
}

.st-journey::before {
  content: '';
  position: absolute;
  top: 9px;
  left: calc(50% / var(--n));
  right: calc(50% / var(--n));
  height: 2px;
  background: var(--accent);
  transform-origin: left center;
}

.st-stop {
  position: relative;
  text-align: center;
}

.st-stop-dot {
  position: absolute;
  top: -30px;
  left: 50%;
  width: 20px;
  height: 20px;
  margin-left: -10px;
  border-radius: 50%;
  background: var(--bg);
  border: 3px solid var(--accent);
}

.st-stop-num {
  display: block;
  margin-top: var(--sp-3);
  font-size: 1rem;
  font-weight: 600;
  letter-spacing: 0.1em;
  font-variant-numeric: tabular-nums;
  color: var(--accent-strong);
}

.st-stop-label {
  margin-top: var(--sp-1);
  font-family: var(--font-display);
  font-size: clamp(1.4rem, 1.1rem + 1vw, 1.875rem);
  line-height: 1.15;
  color: var(--text);
}

.st-stop-text {
  margin-top: var(--sp-2);
  font-size: 1rem;
  line-height: 1.55;
  color: var(--text-secondary);
}

.st-motion .st-journey::before { transition: transform 1.2s var(--st-ease) 0.2s; }
.st-motion .st-visual:not(.is-in) .st-journey::before { transform: scaleX(0); }
.st-motion .st-stop-dot { transition: transform 0.45s cubic-bezier(0.3, 1.6, 0.5, 1) calc(0.35s + var(--k) * 0.3s); }
.st-motion .st-visual:not(.is-in) .st-stop-dot { transform: scale(0); }
.st-motion .st-stop > :not(.st-stop-dot) {
  transition: opacity 0.5s ease calc(0.5s + var(--k) * 0.3s),
              transform 0.5s var(--st-ease) calc(0.5s + var(--k) * 0.3s);
}
.st-motion .st-visual:not(.is-in) .st-stop > :not(.st-stop-dot) { opacity: 0; transform: translateY(10px); }

@media (max-width: 699px) {
  .st-journey {
    grid-template-columns: 1fr;
    gap: var(--sp-6);
    padding-top: 0;
    padding-left: 40px;
  }
  .st-journey::before {
    top: 10px;
    bottom: 10px;
    left: 9px;
    right: auto;
    width: 2px;
    height: auto;
    transform-origin: center top;
  }
  .st-motion .st-visual:not(.is-in) .st-journey::before { transform: scaleY(0); }
  .st-stop { text-align: left; }
  .st-stop-dot { top: 2px; left: -40px; margin-left: 0; }
  .st-stop-num { margin-top: 0; }
}


/* ============================================
   REFRAME
   The old framing gets a hand-drawn strike, then the new one slides
   in. Without motion, both show in their final state.
   ============================================ */

.st-reframe {
  display: flex;
  flex-wrap: wrap;
  align-items: center;
  justify-content: center;
  gap: var(--sp-3) var(--sp-6);
  padding: var(--sp-8) 0;
  font-family: var(--font-display);
  font-size: clamp(2rem, 1.4rem + 2.6vw, 3.5rem);
  line-height: 1.1;
  text-align: center;
}

.st-reframe-from {
  position: relative;
  display: inline-block;
  color: var(--text-muted);
}

.st-reframe-strike {
  position: absolute;
  left: -4%;
  top: 52%;
  width: 108%;
  height: 0.4em;
  transform: translateY(-50%);
  overflow: visible;
}

/* The SVG is stretched to the phrase, and non-scaling-stroke keeps the
   line an even 3px. That combination measures dashes in screen pixels,
   so a pathLength dash left gaps in longer phrases. The strike is
   drawn by un-clipping it from the left instead (see motion below). */
.st-reframe-strike path {
  fill: none;
  stroke: var(--accent);
  stroke-width: 3;
  stroke-linecap: round;
  vector-effect: non-scaling-stroke;
}

.st-reframe-arrow {
  font-size: 0.45em;
  color: var(--accent-strong);
}

.st-reframe-to {
  font-style: italic;
  color: var(--text);
}

.st-reframe-caption {
  max-width: 36rem;
  margin: calc(var(--sp-4) * -1) auto 0;
  font-size: 1.0625rem;
  line-height: 1.6;
  text-align: center;
  color: var(--text-secondary);
}

.st-motion .st-reframe-strike { clip-path: inset(0 100% 0 0); transition: clip-path 0.6s var(--st-ease) 0.5s; }
.st-motion .st-visual.is-in .st-reframe-strike { clip-path: inset(0 0 0 0); }
.st-motion .st-reframe-from { color: var(--text); transition: color 0.5s ease 0.9s; }
.st-motion .st-visual.is-in .st-reframe-from { color: var(--text-muted); }
.st-motion .st-reframe-arrow,
.st-motion .st-reframe-to {
  opacity: 0;
  transform: translateX(-12px);
  transition: opacity 0.5s ease, transform 0.6s var(--st-ease);
}
.st-motion .st-visual.is-in .st-reframe-arrow { opacity: 1; transform: none; transition-delay: 1s; }
.st-motion .st-visual.is-in .st-reframe-to { opacity: 1; transform: none; transition-delay: 1.2s; }


/* ============================================
   BRIDGE
   Two sides and the gap between them. With motion, the dashed gap
   is drawn over by a solid line and its label changes. Stacked on
   phones.
   ============================================ */

.st-bridge {
  display: grid;
  grid-template-columns: minmax(0, 1fr) minmax(140px, 0.8fr) minmax(0, 1fr);
  align-items: center;
  gap: var(--sp-4);
  padding: clamp(var(--sp-4), 2.5vw, var(--sp-8));
  border-radius: var(--r-2xl);
  background: var(--surface);
  border: 1px solid var(--border-subtle);
}

.st-bridge-side {
  padding: var(--sp-6);
  border-radius: var(--r-xl);
  background: var(--bg);
  border: 1px solid var(--border-subtle);
}

.st-bridge-title {
  margin-bottom: var(--sp-3);
  font-family: var(--font-display);
  font-size: clamp(1.5rem, 1.2rem + 1vw, 2rem);
  line-height: 1.15;
  color: var(--text);
}

.st-bridge-side ul { list-style: none; }

.st-bridge-side li {
  position: relative;
  padding: 3px 0 3px var(--sp-4);
  font-size: 1rem;
  line-height: 1.5;
  color: var(--text-secondary);
}

.st-bridge-side li::before {
  content: '';
  position: absolute;
  left: 0;
  top: 0.8em;
  width: 6px;
  height: 6px;
  border-radius: 50%;
  background: var(--accent);
}

.st-bridge-gap {
  position: relative;
  align-self: stretch;
  min-height: 120px;
}

.st-bridge-line {
  position: absolute;
  left: 0;
  right: 0;
  top: 50%;
  height: 3px;
  margin-top: -1.5px;
  background: repeating-linear-gradient(90deg, color-mix(in srgb, var(--text-muted) 70%, transparent) 0 8px, transparent 8px 16px);
}

.st-bridge-line::after {
  content: '';
  position: absolute;
  inset: 0;
  border-radius: 2px;
  background: var(--accent);
  transform-origin: left center;
}

.st-bridge-label {
  position: absolute;
  left: 50%;
  transform: translateX(-50%);
  padding: 4px 12px;
  border-radius: var(--r-pill);
  background: var(--surface);
  font-size: 1rem;
  font-weight: 600;
  letter-spacing: 0.08em;
  text-transform: uppercase;
  white-space: nowrap;
}

.st-bridge-label--gap { top: calc(50% - 44px); color: var(--text-muted); opacity: 0; }
.st-bridge-label--fix { top: calc(50% + 12px); color: var(--accent-strong); }

.st-motion .st-bridge-line::after { transform: scaleX(0); transition: transform 1s var(--st-ease) 1.2s; }
.st-motion .st-visual.is-in .st-bridge-line::after { transform: scaleX(1); }
.st-motion .st-bridge-label--gap { opacity: 1; transition: opacity 0.4s ease 1.6s; }
.st-motion .st-visual.is-in .st-bridge-label--gap { opacity: 0; }
.st-motion .st-bridge-label--fix { opacity: 0; transition: opacity 0.5s ease 2s; }
.st-motion .st-visual.is-in .st-bridge-label--fix { opacity: 1; }
.st-motion .st-bridge-side { transition: opacity 0.6s ease, transform 0.7s var(--st-ease); }
.st-motion .st-visual:not(.is-in) .st-bridge-side.is-left { opacity: 0; transform: translateX(-24px); }
.st-motion .st-visual:not(.is-in) .st-bridge-side.is-right { opacity: 0; transform: translateX(24px); }
.st-motion .st-visual.is-in .st-bridge-side.is-right { transition-delay: 0.25s; }

@media (max-width: 699px) {
  .st-bridge { grid-template-columns: 1fr; }
  .st-bridge-gap { min-height: 130px; }
  .st-bridge-line {
    left: 50%;
    right: auto;
    top: 0;
    bottom: 0;
    width: 3px;
    height: auto;
    margin: 0 0 0 -1.5px;
    background: repeating-linear-gradient(180deg, color-mix(in srgb, var(--text-muted) 70%, transparent) 0 8px, transparent 8px 16px);
  }
  .st-bridge-line::after { transform-origin: center top; }
  .st-motion .st-bridge-line::after { transform: scaleY(0); }
  .st-motion .st-visual.is-in .st-bridge-line::after { transform: scaleY(1); }
  .st-bridge-label--gap { top: 16px; }
  .st-bridge-label--fix { top: auto; bottom: 16px; }
  .st-motion .st-visual:not(.is-in) .st-bridge-side.is-left,
  .st-motion .st-visual:not(.is-in) .st-bridge-side.is-right { transform: translateY(16px); }
}


/* ============================================
   EXERCISE ILLUSTRATIONS (GlowUp)
   Looping SVG animations inside a pinned photo frame; paused with
   reduced motion or Motion off (js).
   ============================================ */

.st-motion-art {
  display: block;
  width: 100%;
  height: 100%;
  background:
    radial-gradient(circle at 50% 50%, color-mix(in srgb, var(--accent) 8%, transparent), transparent 70%),
    var(--surface-raised);
}

.st-motion-guide {
  fill: none;
  stroke: color-mix(in srgb, var(--accent) 45%, transparent);
  stroke-width: 2;
  stroke-dasharray: 4 8;
}

.st-motion-target,
.st-motion-near,
.st-motion-far { fill: var(--accent); }

.st-motion-ring,
.st-motion-ripple {
  fill: none;
  stroke: var(--accent-strong);
  stroke-width: 3;
}