:root {
  --paper: #1a1612;
  --paper-warm: #211c16;
  --paper-raised: #27221c;
  --ink: #f2efe8;
  --ink-72: rgba(242, 239, 232, 0.72);
  --ink-50: rgba(242, 239, 232, 0.5);
  --ink-30: rgba(242, 239, 232, 0.3);
  --hairline: rgba(242, 239, 232, 0.1);
  --hairline-strong: rgba(242, 239, 232, 0.16);
  --carbon: #ff7a5c;
  --carbon-soft: rgba(255, 122, 92, 0.13);
  --carbon-hair: rgba(255, 122, 92, 0.32);
  --silicon: #7bb1e8;
  --silicon-soft: rgba(123, 177, 232, 0.13);
  --silicon-hair: rgba(123, 177, 232, 0.32);
  --overlap: #b388d9;
  --overlap-soft: rgba(179, 136, 217, 0.13);
  --overlap-hair: rgba(179, 136, 217, 0.32);
  --success: #86efac;
  --font:
    -apple-system, BlinkMacSystemFont, "SF Pro Text", "SF Pro Display",
    "PingFang SC", "Helvetica Neue", Arial, sans-serif;
  --max-width: 1280px;
  --topbar-height: 76px;
  color-scheme: dark;
}

* {
  box-sizing: border-box;
}

html {
  scroll-behavior: smooth;
  scroll-snap-type: y mandatory;
  background: var(--paper);
}

body {
  margin: 0;
  min-width: 320px;
  background:
    linear-gradient(rgba(242, 239, 232, 0.016) 1px, transparent 1px),
    linear-gradient(90deg, rgba(242, 239, 232, 0.016) 1px, transparent 1px),
    var(--paper);
  background-size: 52px 52px;
  color: var(--ink);
  font-family: var(--font);
  -webkit-font-smoothing: antialiased;
  text-rendering: optimizeLegibility;
}

button,
input {
  font: inherit;
}

button {
  color: inherit;
}

img {
  max-width: 100%;
}

::selection {
  color: var(--paper);
  background: var(--silicon);
}

.skip-link {
  position: fixed;
  z-index: 1000;
  top: 12px;
  left: 12px;
  padding: 10px 14px;
  border-radius: 999px;
  color: var(--paper);
  background: var(--ink);
  text-decoration: none;
  transform: translateY(-150%);
  transition: transform 180ms ease;
}

.skip-link:focus {
  transform: translateY(0);
}

.topbar {
  position: fixed;
  z-index: 100;
  top: 0;
  right: 0;
  left: 0;
  display: grid;
  grid-template-columns: 1fr auto 1fr;
  align-items: center;
  height: var(--topbar-height);
  padding: env(safe-area-inset-top) 38px 0;
  border-bottom: 1px solid transparent;
  background: linear-gradient(
    180deg,
    rgba(26, 22, 18, 0.96),
    rgba(26, 22, 18, 0.72) 76%,
    transparent
  );
  backdrop-filter: blur(10px);
}

.brand {
  display: inline-flex;
  align-items: center;
  justify-self: start;
  padding: 0;
  border: 0;
  background: transparent;
  cursor: pointer;
}

.brand-logo {
  display: block;
  width: 58px;
  height: 58px;
  object-fit: contain;
}

.meeting-label {
  display: flex;
  align-items: center;
  gap: 12px;
  color: var(--ink-50);
  font-size: 10px;
  font-weight: 650;
  letter-spacing: 0.18em;
}

.meeting-label__place {
  color: var(--ink-72);
}

.meeting-label__divider {
  width: 28px;
  height: 1px;
  background: var(--hairline-strong);
}

.chapter-counter {
  display: flex;
  justify-self: end;
  gap: 5px;
  color: var(--ink-30);
  font-size: 11px;
  font-variant-numeric: tabular-nums;
  letter-spacing: 0.14em;
}

#current-chapter {
  color: var(--ink);
}

.progress-track {
  position: fixed;
  z-index: 101;
  top: 0;
  right: 0;
  left: 0;
  height: 2px;
  background: transparent;
}

.progress-fill {
  width: 11.11%;
  height: 100%;
  background: linear-gradient(
    90deg,
    var(--carbon),
    var(--overlap),
    var(--silicon)
  );
  box-shadow: 0 0 18px rgba(179, 136, 217, 0.42);
  transition: width 460ms cubic-bezier(0.2, 0.8, 0.2, 1);
}

.story-nav {
  position: fixed;
  z-index: 90;
  top: 50%;
  right: 28px;
  display: flex;
  flex-direction: column;
  gap: 12px;
  transform: translateY(-50%);
}

.story-nav button {
  position: relative;
  width: 22px;
  height: 8px;
  padding: 0;
  border: 0;
  background: transparent;
  cursor: pointer;
}

.story-nav button::before {
  position: absolute;
  top: 3px;
  right: 0;
  width: 8px;
  height: 2px;
  border-radius: 999px;
  background: var(--ink-30);
  content: "";
  transition:
    width 220ms ease,
    background-color 220ms ease,
    box-shadow 220ms ease;
}

.story-nav button:hover::before,
.story-nav button:focus-visible::before {
  width: 14px;
  background: var(--ink-72);
}

.story-nav button[aria-current="true"]::before {
  width: 22px;
  background: var(--silicon);
  box-shadow: 0 0 10px rgba(123, 177, 232, 0.45);
}

.story-nav button:focus-visible,
.brand:focus-visible,
.scroll-cue:focus-visible,
.final-footer button:focus-visible {
  outline: 2px solid var(--silicon);
  outline-offset: 4px;
}

.story {
  position: relative;
}

.chapter {
  position: relative;
  display: flex;
  align-items: center;
  min-height: 100svh;
  padding: calc(var(--topbar-height) + 52px) 76px 54px;
  overflow: hidden;
  scroll-snap-align: start;
  scroll-snap-stop: always;
}

.chapter::after {
  position: absolute;
  right: 0;
  bottom: 0;
  left: 0;
  height: 1px;
  background: linear-gradient(
    90deg,
    transparent 5%,
    var(--hairline) 25%,
    var(--hairline) 75%,
    transparent 95%
  );
  content: "";
}

.chapter-inner {
  position: relative;
  z-index: 2;
  width: min(100%, var(--max-width));
  margin: 0 auto;
}

.chapter-inner--hero {
  display: flex;
  flex-direction: column;
  align-items: flex-start;
  justify-content: center;
  min-height: calc(100svh - var(--topbar-height) - 106px);
}

.chapter-inner--split,
.chapter-inner--media {
  display: grid;
  grid-template-columns: minmax(0, 0.9fr) minmax(440px, 1.1fr);
  align-items: center;
  gap: clamp(54px, 7vw, 112px);
}

.chapter-inner--media {
  grid-template-columns: minmax(0, 1fr) minmax(370px, 0.78fr);
}

.chapter-inner--media-reverse {
  grid-template-columns: minmax(370px, 0.75fr) minmax(0, 1fr);
}

.english-memory {
  display: block;
  margin-top: 12px;
  color: var(--ink-50);
  font-size: 0.78em;
  font-weight: 520;
  letter-spacing: 0.01em;
}

.english-memory--center {
  margin: 20px auto 0;
  text-align: center;
}

.eyebrow {
  margin: 0 0 22px;
  color: var(--ink-50);
  font-size: 10px;
  font-weight: 720;
  letter-spacing: 0.24em;
  text-transform: uppercase;
}

.eyebrow::before {
  display: inline-block;
  width: 28px;
  height: 1px;
  margin: 0 12px 3px 0;
  background: linear-gradient(90deg, var(--carbon), var(--silicon));
  content: "";
}

.hero-title {
  max-width: 980px;
  margin: 0;
  font-size: clamp(50px, 5.9vw, 90px);
  font-weight: 590;
  line-height: 0.98;
  letter-spacing: -0.05em;
}

.hero-title > span {
  display: block;
}

.hero-title__quiet {
  color: var(--ink-50);
}

.hero-title__accent {
  margin-top: 0.12em;
  color: var(--silicon);
}

.hero-title__accent .hero-title__quiet {
  display: inline;
  color: var(--ink);
}

.hero-subtitle {
  max-width: 720px;
  margin: 32px 0 0;
  color: var(--ink-72);
  font-size: clamp(17px, 1.7vw, 24px);
  line-height: 1.65;
}

.hero-participants {
  display: flex;
  align-items: center;
  width: min(100%, 760px);
  margin-top: 54px;
}

.participant {
  display: flex;
  flex: 0 0 auto;
  align-items: center;
  gap: 12px;
  min-width: 150px;
}

.participant__avatar {
  display: grid;
  width: 46px;
  height: 46px;
  place-items: center;
  border: 2px solid currentColor;
  border-radius: 50%;
  background: var(--paper);
  font-size: 13px;
  font-weight: 720;
}

.participant strong,
.participant small {
  display: block;
}

.participant strong {
  color: var(--ink);
  font-size: 13px;
}

.participant small {
  margin-top: 3px;
  color: currentColor;
  font-size: 9px;
  font-weight: 700;
  letter-spacing: 0.13em;
  text-transform: uppercase;
}

.participant--carbon {
  color: var(--carbon);
}

.participant--silicon {
  color: var(--silicon);
}

.participant--overlap {
  color: var(--overlap);
}

.participant-link {
  position: relative;
  flex: 1 1 70px;
  height: 1px;
  margin: 0 18px;
  overflow: visible;
  background: linear-gradient(90deg, var(--carbon-hair), var(--silicon-hair));
}

.participant-link::after {
  position: absolute;
  top: -2px;
  left: 50%;
  width: 5px;
  height: 5px;
  border-radius: 50%;
  background: var(--overlap);
  box-shadow: 0 0 12px rgba(179, 136, 217, 0.6);
  content: "";
  animation: signal 3.6s ease-in-out infinite;
}

.scroll-cue {
  display: inline-flex;
  align-items: center;
  gap: 14px;
  margin-top: 52px;
  padding: 0;
  border: 0;
  color: var(--ink-30);
  background: transparent;
  font-size: 9px;
  font-weight: 660;
  letter-spacing: 0.18em;
  cursor: pointer;
}

.scroll-cue__line {
  position: relative;
  display: inline-block;
  width: 80px;
  height: 1px;
  overflow: hidden;
  background: var(--hairline-strong);
}

.scroll-cue__line::after {
  position: absolute;
  inset: 0 auto 0 0;
  width: 32px;
  background: var(--ink-72);
  content: "";
  animation: cue 2.2s ease-in-out infinite;
}

.network-canvas {
  position: absolute;
  z-index: 0;
  inset: 0;
  width: 100%;
  height: 100%;
  opacity: 0.58;
  pointer-events: none;
  mask-image: linear-gradient(
    90deg,
    transparent 0%,
    rgba(0, 0, 0, 0.16) 32%,
    #000 70%,
    #000 100%
  );
}

.ambient {
  position: absolute;
  z-index: 0;
  width: 480px;
  height: 480px;
  border-radius: 50%;
  opacity: 0.12;
  filter: blur(120px);
  pointer-events: none;
}

.ambient--carbon {
  top: -190px;
  left: -220px;
  background: var(--carbon);
}

.ambient--silicon {
  right: -190px;
  bottom: -180px;
  background: var(--silicon);
}

.display-title {
  margin: 0;
  font-size: clamp(40px, 5vw, 70px);
  font-weight: 560;
  line-height: 1.06;
  letter-spacing: -0.042em;
}

.display-title > span {
  display: block;
  margin-top: 0.12em;
}

.text-silicon {
  color: var(--silicon);
}

.text-carbon {
  color: var(--carbon);
}

.text-overlap {
  color: var(--overlap);
}

.lead {
  max-width: 680px;
  margin: 26px 0 0;
  color: var(--ink-72);
  font-size: clamp(16px, 1.45vw, 21px);
  line-height: 1.7;
}

.section-copy--wide {
  max-width: 840px;
}

.section-copy--center {
  max-width: 1040px;
  margin: 0 auto;
  text-align: center;
}

.section-copy--center .lead {
  margin-right: auto;
  margin-left: auto;
}

.build-gap-grid {
  display: grid;
  grid-template-columns: minmax(0, 1fr) 86px minmax(0, 1fr);
  align-items: stretch;
  gap: 22px;
  margin-top: 52px;
}

.layer-panel {
  position: relative;
  min-height: 330px;
  padding: 30px;
  border: 1px solid var(--hairline);
  border-radius: 24px;
  background:
    linear-gradient(145deg, rgba(242, 239, 232, 0.025), transparent 55%),
    var(--paper-warm);
  box-shadow: 0 24px 80px rgba(0, 0, 0, 0.17);
  overflow: hidden;
}

.layer-panel::after {
  position: absolute;
  top: 0;
  bottom: 0;
  width: 3px;
  content: "";
}

.layer-panel--nexus::after {
  left: 0;
  background: var(--silicon);
}

.layer-panel--missing::after {
  right: 0;
  background: var(--carbon);
}

.panel-header {
  display: flex;
  align-items: center;
  justify-content: space-between;
  gap: 20px;
}

.panel-kicker,
.status {
  font-size: 9px;
  font-weight: 720;
  letter-spacing: 0.17em;
}

.panel-kicker {
  color: var(--ink-50);
}

.status {
  padding: 6px 10px;
  border: 1px solid;
  border-radius: 999px;
}

.status--ready {
  border-color: rgba(134, 239, 172, 0.28);
  color: var(--success);
  background: rgba(134, 239, 172, 0.06);
}

.status--missing {
  border-color: var(--carbon-hair);
  color: var(--carbon);
  background: var(--carbon-soft);
}

.layer-panel h3 {
  margin: 23px 0;
  font-size: 34px;
  font-weight: 560;
  letter-spacing: -0.04em;
}

.capability-cloud {
  display: flex;
  flex-wrap: wrap;
  gap: 9px;
}

.capability-cloud span {
  padding: 10px 14px;
  border: 1px solid var(--silicon-hair);
  border-radius: 999px;
  color: var(--silicon);
  background: var(--silicon-soft);
  font-size: 13px;
}

.runtime-line {
  display: flex;
  align-items: center;
  gap: 10px;
  margin-top: 36px;
  color: var(--ink-50);
  font-size: 11px;
}

.runtime-line__pulse {
  width: 7px;
  height: 7px;
  border-radius: 50%;
  background: var(--success);
  box-shadow: 0 0 0 0 rgba(134, 239, 172, 0.48);
  animation: runtimePulse 2.1s ease-out infinite;
}

.runtime-origins {
  margin: 12px 0 0;
  color: var(--ink-30);
  font-size: 9px;
  letter-spacing: 0.06em;
}

.missing-list {
  display: grid;
  gap: 0;
  margin: 0;
  padding: 0;
  list-style: none;
}

.missing-list li {
  display: flex;
  align-items: center;
  gap: 14px;
  min-height: 42px;
  border-bottom: 1px solid var(--hairline);
  color: var(--ink-72);
  font-size: 14px;
}

.missing-list li:last-child {
  border-bottom: 0;
}

.missing-list span {
  color: var(--carbon);
  font-size: 9px;
  font-weight: 700;
  letter-spacing: 0.12em;
}

.gap-symbol {
  display: flex;
  flex-direction: column;
  align-items: center;
  justify-content: center;
  gap: 16px;
  color: var(--ink-50);
}

.gap-symbol span {
  width: 1px;
  height: 72px;
  background: linear-gradient(transparent, var(--hairline-strong), transparent);
}

.gap-symbol strong {
  display: grid;
  width: 48px;
  height: 48px;
  place-items: center;
  border: 1px solid var(--hairline-strong);
  border-radius: 50%;
  background: var(--paper);
  font-size: 22px;
  font-weight: 420;
}

.chapter-statement {
  margin: 36px 0 0;
  color: var(--ink-50);
  font-size: 18px;
  text-align: center;
}

.chapter-statement strong {
  color: var(--ink);
  font-weight: 560;
}

.key-quote {
  max-width: 610px;
  margin: 40px 0 0;
  padding: 18px 0 18px 24px;
  border-left: 3px solid var(--silicon);
  color: var(--ink);
  font-size: clamp(18px, 1.6vw, 24px);
  font-weight: 540;
  line-height: 1.55;
}

.participant-evolution {
  display: grid;
  grid-template-columns: minmax(0, 1fr) 110px minmax(0, 1fr);
  align-items: center;
  gap: 20px;
}

.evolution-stage > p {
  margin: 15px 0 0;
  color: var(--ink-50);
  font-size: 10px;
  font-weight: 680;
  letter-spacing: 0.13em;
  text-align: center;
  text-transform: uppercase;
}

.terminal-card,
.mini-profile {
  min-height: 238px;
  border: 1px solid var(--hairline);
  border-radius: 22px;
  background: var(--paper-warm);
  box-shadow: 0 24px 70px rgba(0, 0, 0, 0.22);
}

.terminal-card {
  overflow: hidden;
}

.terminal-card__bar {
  display: flex;
  gap: 5px;
  padding: 15px 16px;
  border-bottom: 1px solid var(--hairline);
}

.terminal-card__bar span {
  width: 6px;
  height: 6px;
  border-radius: 50%;
  background: var(--ink-30);
}

.terminal-card code {
  display: block;
  padding: 35px 24px;
  color: var(--ink-72);
  font-family: "SFMono-Regular", Consolas, "Liberation Mono", monospace;
  font-size: 11px;
  line-height: 2.1;
}

.terminal-card code span {
  display: inline-block;
  width: 76px;
  color: var(--silicon);
}

.mini-profile {
  display: flex;
  flex-direction: column;
  align-items: center;
  justify-content: center;
  padding: 24px;
  text-align: center;
}

.mini-profile > div {
  display: flex;
  flex-direction: column;
  align-items: center;
  margin-top: 14px;
}

.mini-profile strong {
  font-size: 17px;
}

.mini-profile small {
  margin-top: 4px;
  color: var(--ink-50);
  font-size: 11px;
}

.mini-profile__action {
  display: block;
  width: 100%;
  margin-top: 17px;
  padding: 9px 14px;
  border: 1px solid var(--ink-72);
  border-radius: 999px;
  color: var(--ink);
  background: transparent;
  font-size: 11px;
}

.avatar-ring {
  display: grid;
  flex: 0 0 auto;
  width: 48px;
  height: 48px;
  place-items: center;
  border: 2px solid currentColor;
  border-radius: 50%;
  background: var(--paper-warm);
  font-size: 13px;
  font-weight: 720;
}

.avatar-ring--carbon {
  color: var(--carbon);
}

.avatar-ring--silicon {
  color: var(--silicon);
}

.identity-label {
  display: inline-block;
  margin-top: 8px;
  font-size: 8px;
  font-weight: 760;
  letter-spacing: 0.17em;
}

.identity-label--silicon {
  color: var(--silicon);
}

.evolution-arrow {
  display: flex;
  flex-direction: column;
  align-items: center;
  gap: 12px;
}

.evolution-arrow span {
  color: var(--ink-30);
  font-size: 8px;
  font-weight: 700;
  letter-spacing: 0.12em;
  text-align: center;
}

.evolution-arrow i {
  position: relative;
  width: 100%;
  height: 1px;
  background: linear-gradient(90deg, var(--silicon-hair), var(--overlap));
}

.evolution-arrow i::after {
  position: absolute;
  top: -3px;
  right: 0;
  width: 7px;
  height: 7px;
  border-top: 1px solid var(--overlap);
  border-right: 1px solid var(--overlap);
  content: "";
  transform: rotate(45deg);
}

.layer-comparison {
  display: grid;
  grid-template-columns: minmax(0, 1fr) 180px minmax(0, 1fr);
  align-items: stretch;
  gap: 28px;
  margin-top: 44px;
}

.platform-card {
  position: relative;
  min-height: 330px;
  padding: 34px;
  border: 1px solid;
  border-radius: 26px;
  overflow: hidden;
}

.platform-card::before {
  position: absolute;
  inset: 0;
  opacity: 0.46;
  content: "";
  pointer-events: none;
}

.platform-card--nexus {
  border-color: var(--silicon-hair);
  background: var(--silicon-soft);
}

.platform-card--nexus::before {
  background: radial-gradient(circle at 80% 10%, var(--silicon-soft), transparent 44%);
}

.platform-card--narra {
  border-color: var(--overlap-hair);
  background: var(--overlap-soft);
}

.platform-card--narra::before {
  background: radial-gradient(circle at 20% 10%, var(--overlap-soft), transparent 44%);
}

.platform-card__topline {
  position: relative;
  display: flex;
  align-items: center;
  justify-content: space-between;
  color: var(--ink-50);
  font-size: 8px;
  font-weight: 720;
  letter-spacing: 0.16em;
}

.platform-index {
  color: var(--ink-72);
}

.platform-card h3 {
  position: relative;
  margin: 46px 0 10px;
  font-size: 48px;
  font-weight: 560;
  letter-spacing: -0.055em;
}

.platform-card > p {
  position: relative;
  margin: 0;
  color: var(--ink-72);
  font-size: 14px;
}

.platform-card ul {
  position: relative;
  display: flex;
  flex-wrap: wrap;
  gap: 8px;
  margin: 38px 0 0;
  padding: 0;
  list-style: none;
}

.platform-card li {
  padding: 9px 12px;
  border: 1px solid var(--hairline-strong);
  border-radius: 999px;
  background: rgba(26, 22, 18, 0.35);
  font-size: 11px;
}

.layer-bridge {
  display: flex;
  flex-direction: column;
  align-items: center;
  justify-content: center;
  gap: 13px;
}

.layer-bridge__node {
  width: 9px;
  height: 9px;
  border: 2px solid var(--overlap);
  border-radius: 50%;
  box-shadow: 0 0 18px rgba(179, 136, 217, 0.42);
}

.layer-bridge__line {
  width: 1px;
  height: 76px;
  background: linear-gradient(transparent, var(--overlap-hair));
}

.layer-bridge__label {
  color: var(--overlap);
  font-size: 9px;
  font-weight: 760;
  letter-spacing: 0.17em;
  text-align: center;
}

.platform-difference {
  display: grid;
  grid-template-columns: minmax(0, 1fr) 44px minmax(0, 1fr);
  align-items: center;
  gap: 16px;
  margin-top: 24px;
  padding: 14px 18px;
  border: 1px solid var(--hairline);
  border-radius: 18px;
  background: rgba(242, 239, 232, 0.025);
}

.platform-difference__side {
  display: grid;
  grid-template-columns: minmax(0, 0.8fr) minmax(0, 1.2fr);
  align-items: center;
  gap: 4px 18px;
  min-width: 0;
}

.platform-difference__side span {
  grid-row: 1 / 3;
  color: var(--ink-50);
  font-size: 9px;
  font-weight: 720;
  letter-spacing: 0.1em;
}

.platform-difference__side strong {
  overflow: hidden;
  color: var(--ink-72);
  font-size: 10px;
  font-weight: 650;
  text-overflow: ellipsis;
  white-space: nowrap;
}

.platform-difference__side small {
  color: var(--ink-50);
  font-size: 9px;
}

.platform-difference__side--narra {
  padding-left: 4px;
}

.platform-difference__side--narra span,
.platform-difference__side--narra strong {
  color: var(--overlap);
}

.platform-difference > i {
  color: var(--overlap);
  font-size: 16px;
  font-style: normal;
  text-align: center;
}

.platform-difference__statement {
  margin: 14px 0 0;
  color: var(--ink-50);
  font-size: 12px;
  line-height: 1.6;
  text-align: center;
}

.platform-difference__statement strong {
  color: var(--ink);
  font-weight: 560;
}

.ownership-note {
  margin: 10px 0 0;
  color: var(--ink-50);
  font-size: 12px;
  text-align: center;
}

.ownership-note span {
  margin-left: 8px;
  color: var(--ink);
}

.proof-list {
  display: grid;
  gap: 0;
  max-width: 570px;
  margin-top: 36px;
  border-top: 1px solid var(--hairline);
}

.proof-list > div {
  display: grid;
  grid-template-columns: 44px 1fr;
  align-items: center;
  min-height: 68px;
  border-bottom: 1px solid var(--hairline);
}

.proof-list__index {
  color: var(--silicon);
  font-size: 9px;
  font-weight: 720;
  letter-spacing: 0.13em;
}

.proof-list p {
  display: flex;
  align-items: baseline;
  justify-content: space-between;
  gap: 20px;
  margin: 0;
}

.proof-list strong {
  font-size: 15px;
  font-weight: 550;
}

.proof-list small {
  color: var(--ink-50);
  font-size: 10px;
}

.app-proof {
  position: relative;
  display: grid;
  place-items: center;
  min-height: 620px;
}

.app-proof--double .app-shot {
  position: absolute;
}

.app-shot {
  position: relative;
  margin: 0;
}

.app-shot img {
  display: block;
  width: 100%;
  height: auto;
  border-radius: 24px;
  box-shadow:
    0 36px 90px rgba(0, 0, 0, 0.35),
    0 0 0 1px var(--hairline);
}

.app-shot figcaption {
  position: absolute;
  top: 22px;
  right: -18px;
  padding: 7px 10px;
  border: 1px solid var(--hairline-strong);
  border-radius: 999px;
  color: var(--ink-72);
  background: rgba(26, 22, 18, 0.88);
  font-size: 8px;
  font-weight: 720;
  letter-spacing: 0.14em;
  backdrop-filter: blur(8px);
}

.app-shot--back {
  z-index: 1;
  width: min(46%, 260px);
  transform: translate(-44%, -2%) rotate(-5deg);
}

.app-shot--front {
  z-index: 2;
  width: min(54%, 306px);
  transform: translate(28%, 2%) rotate(2deg);
}

.app-shot--single {
  width: min(100%, 350px);
  justify-self: center;
}

.conversation-sequence {
  display: flex;
  align-items: center;
  margin-top: 38px;
}

.conversation-sequence > div {
  min-width: 86px;
}

.conversation-sequence span,
.conversation-sequence strong,
.conversation-sequence small {
  display: block;
}

.conversation-sequence span {
  color: var(--carbon);
  font-size: 8px;
  font-weight: 720;
  letter-spacing: 0.12em;
}

.conversation-sequence strong {
  margin-top: 7px;
  font-size: 13px;
  font-weight: 560;
}

.conversation-sequence small {
  margin-top: 5px;
  color: var(--ink-50);
  font-size: 9px;
}

.conversation-sequence i {
  flex: 1;
  height: 1px;
  margin: 0 9px;
  background: linear-gradient(90deg, var(--carbon-hair), var(--silicon-hair));
}

.bracket-message {
  position: relative;
  max-width: 570px;
  margin-top: 42px;
  padding: 18px 22px;
  border: 1px solid;
  border-radius: 0 16px 16px 0;
}

.bracket-message::before {
  position: absolute;
  top: -1px;
  bottom: -1px;
  left: -1px;
  width: 3px;
  border-radius: 3px;
  content: "";
}

.bracket-message--silicon {
  border-color: var(--silicon-hair);
  background: var(--silicon-soft);
}

.bracket-message--silicon::before {
  background: var(--silicon);
}

.bracket-message > span {
  color: var(--silicon);
  font-size: 8px;
  font-weight: 760;
  letter-spacing: 0.17em;
}

.bracket-message p {
  margin: 9px 0 0;
  color: var(--ink-72);
  font-size: 13px;
  line-height: 1.6;
}

.agent-roster {
  display: grid;
  grid-template-columns: repeat(2, minmax(0, 1fr));
  gap: 10px;
  margin-top: 38px;
}

.agent-role {
  display: flex;
  align-items: center;
  gap: 12px;
  min-height: 72px;
  padding: 12px 14px;
  border: 1px solid var(--hairline);
  border-radius: 18px;
  background: var(--paper-warm);
}

.agent-role p {
  margin: 0;
}

.agent-role strong,
.agent-role small {
  display: block;
}

.agent-role strong {
  font-size: 12px;
  font-weight: 560;
}

.agent-role small {
  margin-top: 4px;
  color: var(--ink-50);
  font-size: 9px;
}

.agent-role--carbon {
  border-color: var(--carbon-hair);
}

.agent-role--silicon {
  border-color: var(--silicon-hair);
}

.boundary-note {
  margin: 28px 0 0;
  color: var(--ink-50);
  font-size: 11px;
  line-height: 1.6;
}

.boundary-note span {
  display: inline-block;
  margin-right: 10px;
  padding: 5px 8px;
  border: 1px solid var(--overlap-hair);
  border-radius: 999px;
  color: var(--overlap);
  background: var(--overlap-soft);
  font-size: 8px;
  font-weight: 720;
  letter-spacing: 0.12em;
  text-transform: uppercase;
}

.boundary-note code {
  color: var(--silicon);
}

.growth-loop {
  display: grid;
  grid-template-columns: repeat(7, auto);
  align-items: center;
  justify-content: center;
  gap: clamp(12px, 2vw, 30px);
  margin-top: 66px;
}

.growth-step {
  position: relative;
  display: flex;
  flex-direction: column;
  justify-content: center;
  width: clamp(150px, 14vw, 210px);
  min-height: 170px;
  padding: 24px;
  border: 1px solid var(--hairline);
  border-radius: 50%;
  text-align: center;
}

.growth-step--current {
  background:
    radial-gradient(circle at 50% 20%, var(--silicon-soft), transparent 58%),
    var(--paper-warm);
}

.growth-step--future {
  border-style: dashed;
  border-color: var(--overlap-hair);
  background:
    radial-gradient(circle at 50% 20%, var(--overlap-soft), transparent 58%),
    rgba(33, 28, 22, 0.45);
}

.growth-step__number {
  color: var(--silicon);
  font-size: 8px;
  font-weight: 760;
  letter-spacing: 0.14em;
}

.growth-step strong {
  margin-top: 12px;
  font-size: clamp(19px, 1.7vw, 27px);
  font-weight: 560;
  letter-spacing: -0.03em;
}

.growth-step small {
  margin-top: 8px;
  color: var(--ink-50);
  font-size: 10px;
}

.growth-step--future .growth-step__number,
.growth-step--future strong {
  color: var(--overlap);
}

.future-tag {
  position: absolute;
  top: -12px;
  left: 50%;
  padding: 6px 10px;
  border: 1px solid var(--overlap-hair);
  border-radius: 999px;
  color: var(--overlap);
  background: var(--paper);
  font-size: 7px;
  font-weight: 760;
  letter-spacing: 0.12em;
  white-space: nowrap;
  transform: translateX(-50%);
}

.growth-arrow {
  color: var(--silicon);
  font-size: 23px;
}

.growth-arrow--future {
  color: var(--overlap);
}

.feedback-signals {
  display: flex;
  flex-wrap: wrap;
  justify-content: center;
  gap: 8px;
  margin-top: 46px;
}

.feedback-signals span {
  padding: 8px 12px;
  border: 1px solid var(--hairline);
  border-radius: 999px;
  color: var(--ink-50);
  background: var(--paper-warm);
  font-size: 9px;
}

.vision-quote {
  max-width: 820px;
  margin: 38px auto 0;
  color: var(--ink-72);
  font-size: clamp(17px, 1.5vw, 22px);
  line-height: 1.6;
  text-align: center;
}

.vision-quote strong {
  color: var(--ink);
  font-weight: 560;
}

.try-grid {
  display: grid;
  grid-template-columns: minmax(0, 1fr) minmax(340px, 0.72fr);
  align-items: center;
  gap: clamp(60px, 8vw, 130px);
}

.chapter--try .section-copy {
  max-width: 760px;
}

#try-title {
  max-width: 760px;
  font-size: clamp(38px, 4.25vw, 60px);
  line-height: 1.08;
}

.availability-card {
  display: flex;
  align-items: center;
  gap: 18px;
  max-width: 700px;
  margin-top: 34px;
  padding: 18px;
  border: 1px solid var(--hairline);
  border-radius: 20px;
  background: var(--paper-warm);
}

.availability-card img {
  flex: 0 0 auto;
  width: 68px;
  height: 68px;
  border-radius: 16px;
}

.availability-card strong {
  font-size: 15px;
}

.availability-card p {
  margin: 7px 0 0;
  color: var(--ink-72);
  font-size: 11px;
  line-height: 1.6;
}

.availability-card b {
  color: var(--ink);
  font-weight: 580;
}

.final-lines {
  display: grid;
  gap: 0;
  margin-top: 28px;
  border-top: 1px solid var(--hairline);
}

.final-lines p {
  display: grid;
  grid-template-columns: 34px 1fr;
  align-items: center;
  min-height: 48px;
  margin: 0;
  border-bottom: 1px solid var(--hairline);
  color: var(--ink-72);
  font-size: 12px;
}

.final-lines i {
  color: var(--silicon);
  font-size: 8px;
  font-style: normal;
  font-weight: 720;
  letter-spacing: 0.12em;
}

.final-line__copy {
  display: grid;
  gap: 3px;
}

.final-line__copy small {
  color: var(--ink-30);
  font-size: 9px;
  font-weight: 500;
}

.app-store-approved-shot {
  width: min(100%, 390px);
  margin: 0;
  justify-self: center;
}

.app-store-approved-shot a {
  display: block;
  height: 570px;
  overflow: hidden;
  border: 1px solid var(--hairline-strong);
  border-radius: 38px;
  background: #f5f5f7;
  box-shadow: 0 36px 90px rgba(0, 0, 0, 0.28);
}

.app-store-approved-shot a:focus-visible {
  outline: 2px solid var(--silicon);
  outline-offset: 5px;
}

.app-store-approved-shot img {
  display: block;
  width: auto;
  max-width: none;
  height: 100%;
  transform: translateX(-120px);
}

.app-store-approved-shot figcaption {
  margin-top: 12px;
  color: var(--ink-30);
  font-size: 8px;
  font-weight: 720;
  letter-spacing: 0.14em;
  text-align: center;
  text-transform: uppercase;
}

.footer-logo {
  width: 100%;
  max-width: 54px;
  height: 54px;
  object-fit: contain;
}

.final-footer {
  display: grid;
  grid-template-columns: 1fr auto 1fr;
  align-items: center;
  gap: 24px;
  margin-top: 40px;
  padding-top: 22px;
  border-top: 1px solid var(--hairline);
}

.final-footer__brand {
  display: flex;
  align-items: center;
  gap: 8px;
  font-size: 13px;
}

.final-footer p {
  margin: 0;
  color: var(--ink-30);
  font-size: 9px;
  font-weight: 700;
  letter-spacing: 0.15em;
  text-align: center;
  text-transform: uppercase;
}

.final-footer button {
  justify-self: end;
  padding: 0;
  border: 0;
  color: var(--ink-50);
  background: transparent;
  font-size: 8px;
  font-weight: 720;
  letter-spacing: 0.14em;
  cursor: pointer;
}

.keyboard-hint {
  position: fixed;
  z-index: 80;
  right: 28px;
  bottom: 24px;
  display: flex;
  align-items: center;
  gap: 4px;
  color: var(--ink-30);
}

.keyboard-hint > span {
  display: grid;
  width: 20px;
  height: 20px;
  place-items: center;
  border: 1px solid var(--hairline);
  border-radius: 5px;
  font-size: 9px;
}

.keyboard-hint small {
  margin-left: 5px;
  font-size: 8px;
  letter-spacing: 0.1em;
}

.noscript-note {
  position: fixed;
  z-index: 200;
  right: 12px;
  bottom: 12px;
  left: 12px;
  padding: 12px;
  border: 1px solid var(--carbon-hair);
  border-radius: 12px;
  color: var(--ink);
  background: var(--paper-warm);
  font-size: 12px;
  text-align: center;
}

.reveal {
  opacity: 0;
  transform: translateY(22px);
  transition:
    opacity 680ms ease,
    transform 680ms cubic-bezier(0.2, 0.8, 0.2, 1);
}

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

.chapter .reveal:nth-child(2) {
  transition-delay: 70ms;
}

.chapter .reveal:nth-child(3) {
  transition-delay: 140ms;
}

.chapter .reveal:nth-child(4) {
  transition-delay: 210ms;
}

@keyframes cue {
  0% {
    transform: translateX(-120%);
  }
  55%,
  100% {
    transform: translateX(280%);
  }
}

@keyframes signal {
  0%,
  100% {
    transform: translateX(-36px);
  }
  50% {
    transform: translateX(36px);
  }
}

@keyframes runtimePulse {
  0% {
    box-shadow: 0 0 0 0 rgba(134, 239, 172, 0.42);
  }
  70% {
    box-shadow: 0 0 0 8px rgba(134, 239, 172, 0);
  }
  100% {
    box-shadow: 0 0 0 0 rgba(134, 239, 172, 0);
  }
}

@media (max-width: 1100px) {
  .chapter {
    padding-right: 60px;
    padding-left: 60px;
  }

  .chapter-inner--split,
  .chapter-inner--media,
  .chapter-inner--media-reverse {
    gap: 48px;
  }

  .build-gap-grid {
    grid-template-columns: minmax(0, 1fr) 56px minmax(0, 1fr);
  }

  .layer-comparison {
    grid-template-columns: minmax(0, 1fr) 100px minmax(0, 1fr);
  }

  .growth-loop {
    grid-template-columns: repeat(4, minmax(0, 1fr));
    max-width: 900px;
    margin-right: auto;
    margin-left: auto;
  }

  .growth-arrow {
    display: none;
  }

  .growth-step {
    width: auto;
    min-height: 160px;
  }
}

@media (max-width: 820px) {
  :root {
    --topbar-height: 64px;
  }

  html {
    scroll-snap-type: y proximity;
  }

  .topbar {
    grid-template-columns: 1fr auto;
    padding-right: 20px;
    padding-left: 20px;
  }

  .brand-logo {
    width: 50px;
    height: 50px;
  }

  .meeting-label {
    display: none;
  }

  .chapter {
    min-height: 100svh;
    padding: calc(var(--topbar-height) + 42px) 24px 48px;
  }

  .story-nav,
  .keyboard-hint {
    display: none;
  }

  .chapter-inner--split,
  .chapter-inner--media,
  .chapter-inner--media-reverse,
  .try-grid {
    grid-template-columns: 1fr;
    gap: 46px;
  }

  .chapter-inner--media-reverse .app-shot {
    order: 2;
  }

  .hero-title {
    font-size: clamp(44px, 12.5vw, 66px);
  }

  .hero-subtitle {
    margin-top: 24px;
  }

  .hero-participants {
    margin-top: 38px;
  }

  .participant {
    min-width: 0;
  }

  .participant strong {
    font-size: 11px;
  }

  .participant-link {
    margin: 0 10px;
  }

  .scroll-cue {
    margin-top: 40px;
  }

  .build-gap-grid {
    grid-template-columns: 1fr;
    gap: 14px;
    margin-top: 36px;
  }

  .gap-symbol {
    flex-direction: row;
    gap: 12px;
  }

  .gap-symbol span {
    width: 50px;
    height: 1px;
  }

  .gap-symbol strong {
    width: 38px;
    height: 38px;
  }

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

  .participant-evolution {
    grid-template-columns: 1fr;
    max-width: 420px;
    margin: 0 auto;
  }

  .evolution-arrow {
    padding: 8px 70px;
    transform: rotate(90deg);
  }

  .layer-comparison {
    grid-template-columns: 1fr;
    gap: 18px;
    margin-top: 40px;
  }

  .layer-bridge {
    flex-direction: row;
  }

  .layer-bridge__line {
    width: 60px;
    height: 1px;
  }

  .platform-card {
    min-height: 290px;
  }

  .ownership-note span {
    display: block;
    margin: 8px 0 0;
  }

  .platform-difference {
    grid-template-columns: 1fr;
    gap: 10px;
    padding: 18px;
  }

  .platform-difference > i {
    transform: rotate(90deg);
  }

  .platform-difference__side--narra {
    padding: 0;
  }

  .app-proof {
    min-height: 560px;
  }

  .app-shot--single {
    width: min(74vw, 340px);
  }

  .conversation-sequence {
    display: grid;
    grid-template-columns: repeat(4, 1fr);
    gap: 8px;
  }

  .conversation-sequence i {
    display: none;
  }

  .agent-roster {
    grid-template-columns: 1fr;
  }

  .growth-loop {
    grid-template-columns: repeat(2, minmax(0, 1fr));
    gap: 16px;
    margin-top: 44px;
  }

  .growth-step {
    min-height: 160px;
  }

  .app-store-approved-shot {
    width: min(100%, 380px);
  }

  .final-footer {
    grid-template-columns: 1fr auto;
  }

  .final-footer p {
    display: none;
  }
}

@media (max-width: 520px) {
  .chapter {
    align-items: flex-start;
    min-height: 100svh;
    padding-top: calc(var(--topbar-height) + 52px);
  }

  .chapter-inner--hero {
    min-height: calc(100svh - var(--topbar-height) - 100px);
  }

  .hero-title {
    font-size: clamp(40px, 12vw, 58px);
    line-height: 1;
  }

  .display-title {
    font-size: clamp(36px, 10vw, 50px);
  }

  #try-title {
    font-size: clamp(34px, 9.5vw, 46px);
    line-height: 1.1;
  }

  .lead {
    margin-top: 20px;
  }

  .hero-participants {
    justify-content: space-between;
  }

  .participant {
    flex-direction: column;
    gap: 7px;
    text-align: center;
  }

  .participant small {
    display: none;
  }

  .participant__avatar {
    width: 40px;
    height: 40px;
  }

  .participant-link {
    min-width: 20px;
    margin: 0 5px 24px;
  }

  .scroll-cue {
    margin-top: 34px;
  }

  .scroll-cue__line {
    width: 52px;
  }

  .layer-panel {
    padding: 24px;
  }

  .layer-panel h3 {
    font-size: 30px;
  }

  .chapter-statement {
    font-size: 15px;
    line-height: 1.55;
  }

  .platform-card {
    min-height: auto;
    padding: 26px;
  }

  .platform-card h3 {
    margin-top: 34px;
    font-size: 40px;
  }

  .proof-list p {
    display: block;
  }

  .proof-list small {
    display: block;
    margin-top: 4px;
  }

  .app-proof {
    min-height: 500px;
  }

  .app-shot--back {
    width: 49%;
    transform: translate(-38%, -2%) rotate(-5deg);
  }

  .app-shot--front {
    width: 59%;
    transform: translate(25%, 2%) rotate(2deg);
  }

  .conversation-sequence {
    grid-template-columns: repeat(2, 1fr);
    gap: 16px;
  }

  .boundary-note span {
    display: table;
    margin-bottom: 9px;
  }

  .platform-difference__side {
    grid-template-columns: 1fr;
    gap: 5px;
  }

  .platform-difference__side span {
    grid-row: auto;
  }

  .platform-difference__statement {
    text-align: left;
  }

  .growth-loop {
    grid-template-columns: 1fr;
    max-width: 260px;
  }

  .growth-step {
    min-height: 180px;
  }

  .try-grid {
    gap: 42px;
  }

  .availability-card {
    align-items: flex-start;
  }

  .availability-card img {
    width: 54px;
    height: 54px;
    border-radius: 12px;
  }

  .app-store-approved-shot a {
    height: 520px;
    border-radius: 30px;
  }

  .app-store-approved-shot img {
    transform: translateX(-110px);
  }
}

@media (prefers-reduced-motion: reduce) {
  html {
    scroll-behavior: auto;
  }

  *,
  *::before,
  *::after {
    animation-duration: 0.01ms !important;
    animation-iteration-count: 1 !important;
    scroll-behavior: auto !important;
    transition-duration: 0.01ms !important;
  }

  .reveal {
    opacity: 1;
    transform: none;
  }
}