/* ==========================================================================
   D02 Product · Veyra ARC — page styles
   Hero with annotated device figure, sticky anchor nav, scroll-driven
   exploded view, outcomes band, specs, acquisition models, FAQ, CTA band
   and the sticky ISI bar. Behaviour: assets/js/pages/d02-product-arc.js
   ========================================================================== */

/* ── Page frame ─────────────────────────────────────────────────────────── */

.arc-page {
  position: relative;
  min-height: 100vh;
  padding-bottom: 60px;   /* room for the fixed ISI bar */
  background: var(--graphite-50);
}

/* Eyebrow variant for dark bands (full-opacity mist rule) */
.eyebrow--on-dark { color: var(--mist-400); }
.eyebrow--on-dark .eyebrow__rule { background: var(--mist-400); opacity: 1; }

/* Section head: titles left, text link right */
.arc-section-head {
  display: flex;
  flex-wrap: wrap;
  justify-content: space-between;
  align-items: flex-end;
  gap: 24px;
}

.arc-section-head__titles {
  flex: 1 1 480px;
  min-width: 0;
  display: flex;
  flex-direction: column;
  gap: 18px;
}

/* ── Hero ───────────────────────────────────────────────────────────────── */

.arc-hero {
  position: relative;
  max-width: 1320px;
  margin: 0 auto;
  padding: clamp(20px, min(5vw, 4vh), 56px) clamp(20px, 4.2vw, 60px) clamp(48px, 6vw, 80px);
  display: flex;
  flex-wrap: wrap;
  gap: clamp(32px, 4vw, 56px);
  align-items: center;
}

.arc-hero__copy {
  flex: 1 1 480px;
  min-width: 0;
  display: flex;
  flex-direction: column;
  gap: clamp(14px, 2.6vh, 24px);
}

.breadcrumb {
  display: flex;
  flex-wrap: wrap;
  gap: 8px;
  margin: 0;
  padding: 0;
  list-style: none;
  font: 400 14px/1.4 'Geist', sans-serif;
}
.breadcrumb__link { color: var(--graphite-600); }
.breadcrumb__sep { color: var(--graphite-400); }
.breadcrumb__current { font-weight: 500; }

/* Headline: two masked lines that slide up on load */
.arc-hero__title {
  margin: 0;
  font: 500 clamp(44px, min(1.4rem + 5vw, 11vh), 96px)/.96 'Geist', sans-serif;
  letter-spacing: -.045em;
}

.arc-hero__line {
  display: block;
  overflow: hidden;
  padding-bottom: .04em;
}
.arc-hero__line--accent { padding-bottom: .1em; }

.arc-hero__line-inner {
  display: block;
  animation: arcReveal 1100ms var(--ease-diastole) 290ms both;
}
.arc-hero__line--accent .arc-hero__line-inner { animation-delay: 440ms; }

.arc-hero__title .serif-accent { font-size: 1.12em; }

.arc-hero__lead {
  position: relative;
  max-width: 540px;
  font-size: clamp(18px, 1rem + .35vw, 21px);
}

.arc-hero__actions {
  display: flex;
  flex-wrap: wrap;
  gap: 12px;
}

.arc-hero__cta { position: relative; }

/* One-off pulse ring around the primary CTA once the intro has settled */
.arc-hero__pulse {
  position: absolute;
  inset: 0;
  border-radius: var(--radius-pill);
  pointer-events: none;
  animation: lumenPulse 1000ms var(--ease-diastole) 1440ms 1 both;
}

/* Regulatory / indications / first case strip */
.arc-facts {
  display: grid;
  grid-template-columns: repeat(3, minmax(0, 1fr));
  border-top: 1px solid var(--ink-a12);
  border-bottom: 1px solid var(--ink-a12);
}

.arc-facts__item {
  padding: 14px 12px;
  display: flex;
  flex-direction: column;
  gap: 6px;
  border-right: 1px solid var(--ink-a10);
}
.arc-facts__item:first-child { padding-left: 0; }
.arc-facts__item:last-child { border-right: 0; }

.arc-facts__value { font: 500 15px/1.3 'Geist', sans-serif; }

/* ── Citation chip + study card ─────────────────────────────────────────── */

.citation-chip {
  display: inline-flex;
  align-items: center;
  justify-content: center;
  min-width: 22px;
  height: 20px;
  padding: 0 5px;
  margin-left: 6px;
  vertical-align: 3px;
  border: 1px solid rgba(10, 18, 22, .28);
  border-radius: var(--citation-radius);
  background: var(--graphite-0);
  color: var(--graphite-900);
  font: 500 11px/1 'Geist Mono', monospace;
  cursor: pointer;
}
.citation-chip:hover { border-color: var(--scrub-600); color: var(--scrub-600); }

.study-card {
  position: absolute;
  left: 0;
  top: calc(100% + 10px);
  z-index: 8;
  width: min(400px, 100%);
  box-sizing: border-box;
  padding: 18px 20px;
  display: flex;
  flex-direction: column;
  gap: 10px;
  background: var(--graphite-0);
  border: 1px solid var(--ink-a12);
  border-radius: var(--radius-m);
  box-shadow: var(--elevation-3);
  font: 400 14px/1.45 'Geist', sans-serif;
  color: var(--graphite-900);
}

.study-card__title { font: 500 17px/1.3 'Geist', sans-serif; }
.study-card__design { color: var(--graphite-600); }
.study-card__result { font: 500 14px/1.4 'Geist Mono', monospace; }

.study-card__ref {
  padding-top: 8px;
  border-top: 1px solid var(--ink-a10);
  font: 400 12px/1.45 'Geist Mono', monospace;
  color: var(--graphite-500);
}

/* ── FIG. 01 — annotated device ─────────────────────────────────────────── */

.arc-figure {
  flex: 1 1 480px;
  min-width: 0;
  position: relative;
  aspect-ratio: 1 / 1;
  max-height: 640px;
  background-color: var(--graphite-0);
  background-image:
    linear-gradient(var(--ink-a04) 1px, transparent 1px),
    linear-gradient(90deg, var(--ink-a04) 1px, transparent 1px);
  background-size: 20px 20px;
  border: 1px solid var(--ink-a10);
  border-radius: var(--radius-l);
  overflow: hidden;
}

.arc-figure__caption {
  position: absolute;
  left: 20px;
  top: 18px;
  right: 20px;
  display: flex;
  justify-content: space-between;
  font: 500 11px/1 'Geist Mono', monospace;
  letter-spacing: .08em;
  color: var(--graphite-500);
}

.arc-figure__device {
  position: absolute;
  left: 8%;
  top: 14%;
  width: 60%;
  aspect-ratio: 1;
}

/* Calibration tick ring */
.arc-figure__ticks {
  position: absolute;
  inset: -6%;
  border-radius: 50%;
  background: repeating-conic-gradient(var(--ink-a50) 0 .4deg, transparent .4deg 6deg);
  -webkit-mask: radial-gradient(circle, transparent 66%, #000 66.5%, #000 70.5%, transparent 71%);
  mask: radial-gradient(circle, transparent 66%, #000 66.5%, #000 70.5%, transparent 71%);
  transform: scale(1.2);
}

.arc-figure__ring {
  position: absolute;
  inset: 0;
  border-radius: 50%;
  border: 1px solid var(--ink-a16);
}

/* Hatched render placeholder, opened like an aperture on load */
.arc-figure__aperture {
  position: absolute;
  inset: 6%;
  border-radius: 50%;
  overflow: hidden;
  display: flex;
  align-items: center;
  justify-content: center;
  background: repeating-linear-gradient(135deg, var(--sage-100) 0 10px, var(--sage-150) 10px 20px);
  clip-path: circle(50% at 50% 50%);
  animation: arcAperture 1400ms var(--ease-diastole) 140ms both;
}

.arc-figure__placeholder {
  max-width: 60%;
  text-align: center;
  font: 500 11px/1.5 'Geist Mono', monospace;
  letter-spacing: .06em;
  color: var(--graphite-600);
}

.arc-figure__scale {
  position: absolute;
  left: 6%;
  right: 6%;
  bottom: 40px;
  height: 12px;
  background: repeating-linear-gradient(90deg, rgba(10, 18, 22, .45) 0 1px, transparent 1px 10%);
}

.arc-figure__scale-labels {
  position: absolute;
  left: 6%;
  right: 6%;
  bottom: 20px;
  display: flex;
  justify-content: space-between;
  font: 500 11px/1 'Geist Mono', monospace;
  color: var(--graphite-500);
}

/* Callouts: dot + leader line + card. Position via --x / --y, stagger via --i */
.arc-note__dot {
  position: absolute;
  left: var(--x);
  top: var(--y);
  width: 11px;
  height: 11px;
  margin: -5px 0 0 -5px;
  border-radius: 50%;
  border: 1px solid var(--graphite-900);
  background: var(--graphite-0);
  box-shadow: inset 0 0 0 2.5px var(--graphite-0), inset 0 0 0 6px var(--graphite-900);
}

.arc-note__line {
  position: absolute;
  left: var(--x);
  top: var(--y);
  width: calc(62% - var(--x));
  height: 1px;
  margin-left: 6px;
  background: var(--graphite-900);
  transform-origin: left;
  animation: arcDraw var(--dur-5) var(--ease-diastole) calc(740ms + var(--i) * 180ms) both;
}

.arc-note__card {
  position: absolute;
  right: 4%;
  top: var(--y);
  transform: translateY(-50%);
  width: 34%;
  min-width: 140px;
  box-sizing: border-box;
  padding: 10px 12px;
  display: flex;
  flex-direction: column;
  gap: 6px;
  background: var(--graphite-0);
  border: 1px solid var(--ink-a14);
  border-radius: var(--radius-m);
  text-align: left;
  cursor: pointer;
  transition: border-color var(--dur-2);
  animation: arcFade var(--dur-4) ease calc(1240ms + var(--i) * 180ms) both;
}

.arc-note__index {
  font: 500 11px/1 'Geist Mono', monospace;
  color: var(--graphite-500);
}

.arc-note__title {
  font: 500 14px/1.25 'Geist', sans-serif;
  color: var(--graphite-900);
}

.arc-note__spec {
  display: none;
  font: 400 13px/1.35 'Geist Mono', monospace;
  color: var(--graphite-750);
}

.arc-note.is-active .arc-note__dot {
  box-shadow: inset 0 0 0 2.5px var(--graphite-0), inset 0 0 0 6px var(--scrub-600);
}
.arc-note.is-active .arc-note__card { border-color: var(--graphite-900); }
.arc-note.is-active .arc-note__spec { display: block; }

/* ── On-this-page anchors ───────────────────────────────────────────────── */

.anchor-nav {
  position: sticky;
  top: 72px;
  z-index: 30;
  display: flex;
  justify-content: center;
  padding: 10px 12px;
  pointer-events: none;
}

/* The shared site header stays sticky (72px bar, +util bar ≥ 960px), so the
   anchor pill docks right below it instead of sliding under it. */
@media (min-width: 960px) {
  .anchor-nav { top: 110px; }
}

.anchor-nav__track {
  display: flex;
  gap: 2px;
  max-width: 100%;
  padding: 4px;
  overflow-x: auto;
  border: 1px solid var(--ink-a12);
  border-radius: var(--radius-pill);
  background: rgba(245, 246, 243, .9);
  -webkit-backdrop-filter: blur(16px);
  backdrop-filter: blur(16px);
  pointer-events: auto;
}

.anchor-nav__link,
.anchor-nav__link:hover {
  flex: none;
  height: 36px;
  display: inline-flex;
  align-items: center;
  padding: 0 14px;
  border-radius: var(--radius-pill);
  color: var(--graphite-900);
  font: 500 13px/1 'Geist', sans-serif;
  text-decoration: none;
}

/* ── How it works: exploded view ────────────────────────────────────────── */

.arc-how {
  position: relative;
  max-width: 1320px;
  margin: 0 auto;
  padding: 0 clamp(20px, 4.2vw, 60px);
  scroll-margin-top: 140px;
}

.arc-how__layout {
  display: flex;
  flex-wrap: wrap;
  gap: clamp(24px, 4vw, 64px);
}

.arc-how__stage-wrap {
  flex: 1 1 440px;
  min-width: 0;
  position: static;
  z-index: 2;
  align-self: flex-start;
}

/* --spread (0.25 → 1) is set by the page script from the active step */
.arc-stage {
  --spread: .25;
  position: sticky;
  top: 140px;
  height: min(70vh, 620px);
  border-radius: var(--radius-l);
  background: var(--graphite-950);
  overflow: hidden;
}

.arc-stage__caption {
  position: absolute;
  left: 20px;
  top: 18px;
  right: 20px;
  display: flex;
  justify-content: space-between;
  font: 500 11px/1 'Geist Mono', monospace;
  letter-spacing: .08em;
  color: var(--mist-400);
}

.arc-stage__note {
  position: absolute;
  left: 20px;
  bottom: 18px;
  font: 400 12px/1.4 'Geist Mono', monospace;
  color: var(--mist-400);
}

.arc-layer {
  position: absolute;
  left: 50%;
  top: 50%;
  width: var(--layer-width);
  height: 64px;
  margin-left: calc(var(--layer-width) / -2);
  margin-top: -32px;
  display: flex;
  align-items: center;
  justify-content: center;
  border: 1px solid var(--mist-a20);
  border-radius: 12px;
  background: rgba(232, 236, 234, .03);
  color: var(--mist-400);
  font: 500 11px/1 'Geist Mono', monospace;
  letter-spacing: .06em;
  transform: translateY(calc(var(--layer-pos) * 92px * var(--spread)));
  transition: transform var(--dur-5) var(--ease-diastole), border-color var(--dur-3), background var(--dur-3);
}

.arc-layer.is-active {
  border-color: var(--scrub-300);
  background: rgba(82, 224, 168, .1);
  color: var(--scrub-300);
}

.arc-steps {
  flex: 1 1 380px;
  min-width: 0;
  margin: 0;
  padding: 0;
  list-style: none;
}

.arc-step {
  min-height: 70vh;
  display: flex;
  flex-direction: column;
  justify-content: center;
  gap: 16px;
  opacity: .55;
  transition: opacity var(--dur-4);
}
.arc-step.is-active { opacity: 1; }

.arc-step__kicker {
  font: 500 12px/1 'Geist Mono', monospace;
  letter-spacing: .08em;
  color: var(--graphite-600);
}

.arc-step__title {
  margin: 0;
  font: 500 clamp(32px, 1.4rem + 2.2vw, 56px)/1.02 'Geist', sans-serif;
  letter-spacing: -.035em;
}

.arc-step__text {
  margin: 0;
  max-width: 440px;
  font: 400 17px/1.6 'Geist', sans-serif;
  color: var(--graphite-750);
}

.arc-step__spec {
  font: 500 13px/1.4 'Geist Mono', monospace;
  color: var(--graphite-900);
}

@media (max-width: 959.98px) {
  /* Small stage pinned above the step text; every step fully readable */
  .arc-how__stage-wrap { position: sticky; top: 124px; }
  .arc-stage { height: 220px; }
  .arc-step { min-height: 52vh; opacity: 1; }
}

@media (prefers-reduced-motion: reduce) {
  .arc-step { opacity: 1; }
}

/* ── 02 Clinical outcomes ───────────────────────────────────────────────── */

.arc-outcomes {
  position: relative;
  padding: clamp(72px, 9vw, 128px) clamp(8px, 1.2vw, 16px) 0;
  scroll-margin-top: 120px;
}

.arc-outcomes__panel {
  border-radius: 24px;
  background: var(--graphite-950);
  color: var(--graphite-mist);
  overflow: hidden;
}

.arc-outcomes__inner {
  max-width: 1320px;
  margin: 0 auto;
  padding: clamp(56px, 7vw, 112px) clamp(20px, 4.2vw, 60px);
  display: flex;
  flex-direction: column;
  gap: 48px;
}

.arc-outcomes__title {
  margin: 0;
  font: 500 clamp(40px, 1.4rem + 4vw, 80px)/1.04 'Geist', sans-serif;
  letter-spacing: -.035em;
}
.arc-outcomes__title .serif-accent,
.arc-acquire__title .serif-accent { letter-spacing: inherit; }

.arc-outcomes__link,
.arc-outcomes__link:hover {
  font: 500 16px/1 'Geist', sans-serif;
  color: var(--scrub-300);
  text-decoration: none;
}

.arc-stats {
  display: grid;
  grid-template-columns: repeat(auto-fit, minmax(min(100%, 240px), 1fr));
  border-top: 1px solid rgba(232, 236, 234, .16);
}

.arc-stat {
  padding: 28px 24px 0 0;
  display: flex;
  flex-direction: column;
  gap: 12px;
  border-right: 1px solid rgba(232, 236, 234, .08);
}
.arc-stat .mono-label { color: var(--mist-400); }

.arc-stat__value {
  display: flex;
  align-items: baseline;
  gap: 6px;
  font: 500 clamp(48px, 2rem + 2.6vw, 80px)/1 'Geist', sans-serif;
  letter-spacing: -.04em;
  font-variant-numeric: tabular-nums;
}

.arc-stat__unit {
  font: 500 18px 'Geist Mono', monospace;
  letter-spacing: 0;
  color: var(--mist-400);
}

.arc-stat__cite {
  align-self: flex-start;
  margin-top: 8px;
  padding: 2px 5px;
  border: 1px solid rgba(232, 236, 234, .35);
  border-radius: var(--citation-radius);
  font: 500 11px 'Geist Mono', monospace;
  letter-spacing: 0;
}

.arc-stat__text {
  font: 400 16px/1.45 'Geist', sans-serif;
  color: var(--mist-200);
}

.arc-outcomes__footnote {
  font: 400 12px/1.5 'Geist Mono', monospace;
  color: var(--mist-400);
}

/* ── 03 Specifications / 04 Integration & service ───────────────────────── */

.arc-specs {
  max-width: 1320px;
  margin: 0 auto;
  padding: clamp(72px, 9vw, 128px) clamp(20px, 4.2vw, 60px) 0;
  display: grid;
  grid-template-columns: repeat(auto-fit, minmax(min(100%, 440px), 1fr));
  gap: clamp(32px, 4vw, 56px);
  scroll-margin-top: 120px;
}

.arc-specs__col {
  display: flex;
  flex-direction: column;
  gap: 24px;
  scroll-margin-top: 120px;
}

.spec-list {
  margin: 0;
  display: grid;
  grid-template-columns: minmax(0, 1fr) minmax(0, 1.2fr);
  border-top: 1px solid var(--ink-a12);
}

.spec-list__key,
.spec-list__value {
  margin: 0;
  padding: 14px 0;
  border-bottom: 1px solid var(--ink-a08);
}

.spec-list__key {
  font: 400 15px/1.3 'Geist', sans-serif;
  color: var(--graphite-600);
}

.spec-list__value {
  font: 500 15px/1.3 'Geist Mono', monospace;
  font-variant-numeric: tabular-nums;
}

.arc-specs__download { align-self: flex-start; }

.service-grid {
  display: grid;
  grid-template-columns: repeat(auto-fit, minmax(200px, 1fr));
  gap: 12px;
}

.service-card {
  padding: 20px;
  display: flex;
  flex-direction: column;
  gap: 8px;
  border: 1px solid var(--ink-a12);
  border-radius: 12px;
  background: var(--graphite-0);
}

.service-card__title { font: 500 18px/1.25 'Geist', sans-serif; }

.service-card__text {
  font: 400 14px/1.45 'Geist', sans-serif;
  color: var(--graphite-600);
}

/* ── 05 Acquisition models ──────────────────────────────────────────────── */

.arc-acquire {
  max-width: 1320px;
  margin: 0 auto;
  padding: clamp(72px, 9vw, 128px) clamp(20px, 4.2vw, 60px) 0;
  display: flex;
  flex-direction: column;
  gap: 32px;
  scroll-margin-top: 120px;
}

.arc-acquire__title {
  margin: 0;
  font: 500 clamp(36px, 1.4rem + 3vw, 64px)/1.04 'Geist', sans-serif;
  letter-spacing: -.035em;
}

.arc-acquire__link {
  font: 500 16px/1 'Geist', sans-serif;
  text-decoration: none;
}

.model-grid {
  display: grid;
  grid-template-columns: repeat(auto-fit, minmax(min(100%, 280px), 1fr));
  gap: 16px;
}

.model-card {
  padding: 28px;
  display: flex;
  flex-direction: column;
  gap: 14px;
  border: 1px solid var(--ink-a12);
  border-radius: var(--radius-l);
  background: var(--graphite-0);
}

.model-card__title {
  font: 500 26px/1.15 'Geist', sans-serif;
  letter-spacing: -.02em;
}

.model-card__text {
  font: 400 15px/1.55 'Geist', sans-serif;
  color: var(--graphite-600);
}

.model-card__best {
  margin-top: auto;
  padding-top: 14px;
  border-top: 1px solid var(--ink-a08);
  font: 500 13px/1.4 'Geist Mono', monospace;
}

/* Regional availability notice (status: low / info) */
.availability-note {
  display: flex;
  flex-wrap: wrap;
  gap: 16px;
  align-items: center;
  justify-content: space-between;
  padding: 20px 24px;
  border-radius: 12px;
  background: var(--status-low-bg);
  color: var(--status-low-fg);
}

.availability-note__text {
  display: flex;
  gap: 12px;
  align-items: flex-start;
  font: 400 15px/1.5 'Geist', sans-serif;
}
.availability-note__text b { font-weight: 500; }

.availability-note__icon {
  flex: none;
  width: 22px;
  height: 22px;
  display: flex;
  align-items: center;
  justify-content: center;
  border: 1.5px solid currentColor;
  border-radius: 50%;
  font: 600 12px/1 'Geist Mono', monospace;
}

.availability-note__cta,
.availability-note__cta:hover {
  flex: none;
  display: inline-flex;
  align-items: center;
  height: 44px;
  padding: 0 18px;
  border: 1px solid currentColor;
  border-radius: var(--radius-pill);
  color: var(--status-low-fg);
  font: 500 15px/1 'Geist', sans-serif;
  text-decoration: none;
}

/* ── 06 FAQ accordion ───────────────────────────────────────────────────── */

.arc-faq {
  max-width: 960px;
  margin: 0 auto;
  padding: clamp(72px, 9vw, 128px) clamp(20px, 4.2vw, 60px);
  display: flex;
  flex-direction: column;
  gap: 24px;
  scroll-margin-top: 120px;
}

.faq-item { border-top: 1px solid var(--ink-a12); }

.faq-item__heading { margin: 0; }

.faq-item__toggle {
  width: 100%;
  min-height: 68px;
  display: flex;
  justify-content: space-between;
  align-items: center;
  gap: 16px;
  padding: 0;
  border: 0;
  background: none;
  color: var(--graphite-900);
  font: 500 19px/1.3 'Geist', sans-serif;
  text-align: left;
  cursor: pointer;
}

.faq-item__sign {
  flex: none;
  width: 32px;
  height: 32px;
  display: flex;
  align-items: center;
  justify-content: center;
  border: 1px solid var(--ink-a20);
  border-radius: 50%;
  font: 400 16px/1 'Geist Mono', monospace;
}

.faq-item__answer {
  margin: 0;
  padding: 0 56px 24px 0;
  font: 400 16px/1.6 'Geist', sans-serif;
  color: var(--graphite-750);
}

/* ── Closing CTA band ───────────────────────────────────────────────────── */

.cta-band {
  position: relative;
  overflow: hidden;
  border-top: 1px solid var(--ink-a12);
  background: var(--graphite-0);
}

.cta-band__inner {
  max-width: 1320px;
  margin: 0 auto;
  padding: clamp(72px, 9vw, 128px) clamp(20px, 4.2vw, 60px);
  display: flex;
  flex-direction: column;
  gap: 28px;
}

.cta-band__actions {
  display: flex;
  flex-wrap: wrap;
  gap: 12px;
}

.cta-band__note {
  font: 400 15px/1.4 'Geist', sans-serif;
  color: var(--graphite-600);
}

/* ── Full ISI ───────────────────────────────────────────────────────────── */

.isi-full {
  max-width: 960px;
  margin: 0 auto;
  padding: 56px clamp(20px, 4.2vw, 60px);
  display: flex;
  flex-direction: column;
  gap: 12px;
}

.isi-full__label {
  font: 500 12px/1 'Geist Mono', monospace;
  letter-spacing: .08em;
  color: var(--graphite-600);
}

.isi-full__text {
  margin: 0;
  font: 400 15px/1.65 'Geist', sans-serif;
  color: var(--graphite-750);
}

/* ── Sticky ISI bar ─────────────────────────────────────────────────────── */

.isi-bar {
  position: fixed;
  left: 0;
  right: 0;
  bottom: 0;
  z-index: 44;
  border-top: 2px solid var(--graphite-900);
  background: rgba(255, 255, 255, .94);
  -webkit-backdrop-filter: blur(20px);
  backdrop-filter: blur(20px);
}

.isi-bar__row {
  max-width: 1320px;
  min-height: 46px;
  margin: 0 auto;
  padding: 0 clamp(12px, 4.2vw, 60px);
  display: flex;
  align-items: center;
  justify-content: space-between;
  gap: 12px;
}
.isi-bar.is-scrolled .isi-bar__row { min-height: 60px; }

.isi-bar__toggle {
  display: flex;
  align-items: center;
  gap: 10px;
  min-height: 44px;
  padding: 0;
  border: 0;
  background: none;
  color: var(--graphite-900);
  font: 500 15px/1.2 'Geist', sans-serif;
  text-align: left;
  cursor: pointer;
}

.isi-bar__sign {
  font: 500 12px/1 'Geist Mono', monospace;
  color: var(--graphite-600);
}

.isi-bar__cta {
  flex: none;
  height: 44px;
  font-size: 15px;
}

.isi-bar__panel {
  max-height: 0;
  overflow: auto;
  transition: max-height var(--dur-4) var(--ease-diastole);
}
.isi-bar.is-expanded .isi-bar__panel { max-height: 40vh; }

.isi-bar__text {
  max-width: 1320px;
  margin: 0 auto;
  padding: 0 clamp(12px, 4.2vw, 60px) 20px;
  box-sizing: border-box;
  font: 400 14px/1.6 'Geist', sans-serif;
  color: var(--graphite-750);
}

/* ── Keyframes (intro sequence) ─────────────────────────────────────────── */

@keyframes arcReveal {
  from { transform: translateY(105%); }
  to   { transform: translateY(0); }
}

@keyframes arcAperture {
  from { clip-path: circle(0% at 50% 50%); }
  to   { clip-path: circle(50% at 50% 50%); }
}

@keyframes arcDraw {
  from { transform: scaleX(0); }
  to   { transform: scaleX(1); }
}

@keyframes arcFade {
  from { opacity: 0; }
  to   { opacity: 1; }
}