.system-story {
  --story-light-x: 72%;
  --story-light-y: 48%;
  --story-cinema: 0;
  --story-light-alpha: 4%;
  --story-ocean-alpha: 8%;
  --story-vignette: .08;
  position: relative;
  z-index: 2;
  height: 598vh;
  padding: 0;
  overflow: visible;
  background:
    radial-gradient(circle at 72% 48%, color-mix(in srgb, var(--ocean) 10%, transparent), transparent 34%),
    linear-gradient(180deg, var(--bg), color-mix(in srgb, var(--ocean) 7%, var(--bg)) 48%, var(--bg));
  isolation: isolate;
}

/* `overflow-x:hidden` turns the page root into a sticky containing block in
   mobile WebKit. Clip the horizontal overflow on the story page so the native
   sticky stage remains attached to the viewport without changing its layout. */
@supports (overflow: clip) {
  html,
  body {
    overflow-x: clip;
  }
}

.system-story-sticky {
  position: sticky;
  top: 0;
  display: grid;
  align-items: center;
  height: 100vh;
  min-height: 0;
  overflow: hidden;
  perspective: 1400px;
  isolation: isolate;
}

.system-story-sticky::before,
.system-story-sticky::after {
  content: "";
  position: absolute;
  inset: 0;
  pointer-events: none;
}

.system-story-sticky::before {
  z-index: -2;
  background:
    radial-gradient(circle at var(--story-light-x) var(--story-light-y), color-mix(in srgb, var(--cyan) var(--story-light-alpha), transparent), transparent 20%),
    radial-gradient(ellipse at 68% 54%, color-mix(in srgb, var(--ocean) var(--story-ocean-alpha), transparent), transparent 44%);
  transform: scale(calc(1 + var(--story-cinema) * .08));
  transform-origin: var(--story-light-x) var(--story-light-y);
  will-change: transform;
}

.system-story-sticky::after {
  z-index: 20;
  background:
    linear-gradient(90deg, rgba(1, 8, 22, .42), transparent 15%, transparent 84%, rgba(1, 8, 22, .42)),
    radial-gradient(ellipse at center, transparent 48%, rgba(1, 8, 22, var(--story-vignette)) 100%);
}

.system-story .wrap {
  position: relative;
  z-index: 2;
  width: min(1260px, calc(100% - 72px));
}

.system-story-grid {
  display: grid;
  grid-template-columns: minmax(0, .92fr) minmax(480px, 1.08fr);
  gap: clamp(44px, 5.5vw, 82px);
  align-items: center;
}

.story-copy-stage {
  position: relative;
  min-height: 430px;
}

.story-chapter {
  position: absolute;
  inset: 0;
  display: flex;
  flex-direction: column;
  justify-content: center;
  opacity: 0;
  transform: translateY(28px);
  filter: blur(8px);
  pointer-events: none;
  transform-origin: left center;
  will-change: opacity, transform;
}

.story-chapter.is-active {
  pointer-events: auto;
  opacity: 1;
  transform: none;
  filter: none;
}

.story-count {
  margin-bottom: 24px;
  color: var(--cyan);
  font-family: var(--mono);
  font-size: 9px;
  letter-spacing: .18em;
  text-transform: uppercase;
}

.story-chapter h2 {
  margin: 0;
  font-size: clamp(48px, 5.7vw, 82px);
  line-height: .92;
  letter-spacing: -.06em;
  text-wrap: balance;
  transform: translate3d(var(--chapter-drift, 0px), 0, 0);
}

.story-chapter h2 span {
  color: var(--cyan);
}

.story-chapter p {
  max-width: 590px;
  margin: 28px 0 0;
  color: var(--ink-mute);
  font-size: clamp(17px, 1.6vw, 21px);
  line-height: 1.6;
  text-wrap: pretty;
  transform: translate3d(var(--chapter-counter-drift, 0px), 0, 0);
}

.story-list {
  display: grid;
  gap: 12px;
  margin-top: 30px;
}

.story-list span {
  display: flex;
  align-items: center;
  gap: 11px;
  color: var(--ink);
  font-size: 15px;
}

.story-list i {
  width: 7px;
  height: 7px;
  border-radius: 2px;
  background: var(--cyan);
  box-shadow: 0 0 12px color-mix(in srgb, var(--cyan) 70%, transparent);
}

.story-system-map {
  --connect-progress: 0;
  --practice-progress: 0;
  --outcome-progress: 0;
  --camera-x: 0px;
  --camera-y: 18px;
  --camera-tilt: 4deg;
  --camera-scale: .92;
  --scan-y: 17%;
  --scan-opacity: 0;
  --panel-glow: 0;
  --core-pulse: 0;
  --story-orbit-a: 0deg;
  --story-orbit-b: 0deg;
  --story-core-float: 0px;
  --story-mark-tilt: 0deg;
  position: relative;
  width: min(100%, calc(100vh - 160px));
  aspect-ratio: 1;
  justify-self: end;
  overflow: hidden;
  border: 1px solid var(--line);
  border-radius: 28px;
  background:
    linear-gradient(90deg, color-mix(in srgb, var(--line) 52%, transparent) 1px, transparent 1px),
    linear-gradient(color-mix(in srgb, var(--line) 52%, transparent) 1px, transparent 1px),
    radial-gradient(circle at 50% 50%, color-mix(in srgb, var(--ocean) 13%, transparent), transparent 34%),
    color-mix(in srgb, var(--surface) 76%, transparent);
  background-size: 48px 48px, 48px 48px, auto, auto;
  background-position:
    calc(var(--story-progress, 0) * -22px) calc(var(--story-progress, 0) * 12px),
    calc(var(--story-progress, 0) * -22px) calc(var(--story-progress, 0) * 12px),
    center,
    center;
  box-shadow:
    inset 0 0 100px rgba(3, 15, 38, .32),
    inset 0 0 calc(30px + var(--panel-glow) * 46px) color-mix(in srgb, var(--ocean) calc(var(--panel-glow) * 13%), transparent),
    0 32px 80px rgba(2, 10, 28, .18),
    0 0 calc(var(--panel-glow) * 56px) color-mix(in srgb, var(--cyan) calc(var(--panel-glow) * 8%), transparent);
  opacity: calc(.74 + var(--story-cinema) * .26);
  transform: perspective(1200px) translate3d(var(--camera-x), var(--camera-y), 0) rotateX(var(--camera-tilt)) scale(var(--camera-scale));
  transform-origin: 50% 52%;
  will-change: transform, opacity;
  contain: layout paint;
  isolation: isolate;
}

.story-system-map::before,
.story-system-map::after {
  content: "";
  position: absolute;
  z-index: 1;
  pointer-events: none;
}

.story-system-map::before {
  inset: 12px;
  border: 1px solid color-mix(in srgb, var(--line) 58%, transparent);
  border-radius: 20px;
  opacity: calc(.72 + var(--panel-glow) * .28);
  box-shadow: inset 0 0 calc(var(--panel-glow) * 30px) color-mix(in srgb, var(--cyan) 8%, transparent);
}

.story-system-map::after {
  left: 12%;
  right: 12%;
  top: var(--scan-y);
  height: 1px;
  opacity: var(--scan-opacity);
  background: linear-gradient(90deg, transparent, var(--cyan), transparent);
  box-shadow: 0 0 18px color-mix(in srgb, var(--cyan) 65%, transparent);
}

.story-stage-head,
.story-stage-foot {
  position: absolute;
  z-index: 7;
  left: 26px;
  right: 26px;
  display: flex;
  justify-content: space-between;
  gap: 20px;
  color: var(--ink-mute);
  font-family: var(--mono);
  font-size: 8px;
  letter-spacing: .16em;
  text-transform: uppercase;
}

.story-stage-head {
  top: 22px;
}

.story-stage-head span:last-child,
.story-stage-foot span:last-child {
  color: var(--cyan);
  text-align: right;
}

.story-stage-foot {
  bottom: 22px;
}

.story-flow {
  position: absolute;
  z-index: 2;
  inset: 0;
  width: 100%;
  height: 100%;
  transform: translate3d(0, calc(var(--story-progress) * -3px), 0) scale(calc(.985 + var(--story-cinema) * .015));
  transform-origin: center;
}

.story-grid-line,
.story-flow-base,
.story-flow-live,
.story-output-path {
  fill: none;
  vector-effect: non-scaling-stroke;
}

.story-grid-line {
  stroke: color-mix(in srgb, var(--line-2) 62%, transparent);
  stroke-width: 1;
  stroke-dasharray: 2 9;
}

.story-flow-base {
  stroke: color-mix(in srgb, var(--ink-mute) 38%, transparent);
  stroke-width: 1.25;
  stroke-dasharray: .18 .085;
}

.story-flow-live {
  opacity: var(--connect-progress);
  stroke: var(--cyan);
  stroke-width: 2;
  stroke-linecap: round;
  stroke-dasharray: 1;
  stroke-dashoffset: calc(1 - var(--connect-progress));
  filter: drop-shadow(0 0 8px color-mix(in srgb, var(--cyan) 72%, transparent));
}

.story-output-path {
  opacity: var(--outcome-progress);
  stroke: var(--cyan);
  stroke-width: 2.5;
  stroke-linecap: round;
  stroke-dasharray: 1;
  stroke-dashoffset: calc(1 - var(--outcome-progress));
  filter: drop-shadow(0 0 10px color-mix(in srgb, var(--cyan) 74%, transparent));
}

.story-packet,
.story-output-packet {
  opacity: 0;
  fill: var(--cyan);
  filter: drop-shadow(0 0 7px var(--cyan));
}

.story-node {
  --node-active: 0;
  position: absolute;
  z-index: 5;
  display: grid;
  grid-template-columns: auto 1fr;
  grid-template-rows: auto auto;
  column-gap: 10px;
  align-content: center;
  width: 126px;
  height: 74px;
  padding: 13px 15px;
  border: 1px solid var(--line-2);
  border-radius: 16px;
  background: color-mix(in srgb, var(--bg-2) 90%, transparent);
  color: var(--ink-mute);
  box-shadow: 0 16px 30px rgba(2, 10, 28, .15);
  opacity: .62;
  transition:
    opacity 320ms ease,
    transform 600ms cubic-bezier(.2, .8, .2, 1),
    border-color 240ms ease;
  will-change: transform;
}

.story-node::after {
  content: "";
  position: absolute;
  inset: -1px;
  border: 1px solid var(--cyan);
  border-radius: inherit;
  opacity: var(--node-active);
  box-shadow: 0 0 22px color-mix(in srgb, var(--cyan) 22%, transparent);
}

.story-node > span {
  grid-row: 1 / 3;
  align-self: center;
  color: var(--cyan);
  font-family: var(--mono);
  font-size: 8px;
  letter-spacing: .1em;
}

.story-node strong {
  align-self: end;
  color: color-mix(in srgb, var(--ink) calc(60% + var(--node-active) * 40%), var(--ink-mute));
  font-size: 15px;
  line-height: 1;
}

.story-node small {
  align-self: start;
  margin-top: 5px;
  font-family: var(--mono);
  font-size: 7px;
  letter-spacing: .14em;
  text-transform: uppercase;
}

.story-node.n1 {
  left: 5%;
  top: 22%;
}

.story-node.n2 {
  right: 5%;
  top: 22%;
}

.story-node.n3 {
  left: 5%;
  bottom: 22%;
}

.story-node.n4 {
  right: 5%;
  bottom: 22%;
}

.story-system-map[data-step="0"] .story-node {
  opacity: .42;
  transform: scale(.94);
}

.story-system-map[data-step="1"] .story-node {
  opacity: .72;
}

.story-system-map[data-step="2"] .story-node,
.story-system-map[data-step="3"] .story-node {
  opacity: 1;
}

.story-system-map[data-step="4"] .story-node {
  opacity: .82;
}

.story-system-map[data-step="4"] .story-node.n1 {
  transform: translate(25px, 22px) scale(.9);
}

.story-system-map[data-step="4"] .story-node.n2 {
  transform: translate(-25px, 22px) scale(.9);
}

.story-system-map[data-step="4"] .story-node.n3 {
  transform: translate(25px, -22px) scale(.9);
}

.story-system-map[data-step="4"] .story-node.n4 {
  transform: translate(-25px, -22px) scale(.9);
}

.story-friction {
  position: absolute;
  z-index: 6;
  padding: 5px 8px;
  border: 1px solid color-mix(in srgb, var(--ink-mute) 48%, transparent);
  border-radius: 99px;
  background: var(--bg-2);
  color: var(--ink-mute);
  font-family: var(--mono);
  font-size: 7px;
  letter-spacing: .1em;
  text-transform: uppercase;
  opacity: 0;
  transform: scale(.86);
  transition: opacity 240ms ease, transform 320ms cubic-bezier(.2, .8, .2, 1);
}

.story-friction::before {
  content: "";
  display: inline-block;
  width: 5px;
  height: 5px;
  margin-right: 6px;
  border: 1px solid var(--ink-mute);
  border-radius: 50%;
}

.story-friction.f1 {
  left: 29%;
  top: 29%;
}

.story-friction.f2 {
  right: 27%;
  top: 29%;
}

.story-friction.f3 {
  left: 30%;
  bottom: 29%;
}

.story-friction.f4 {
  right: 28%;
  bottom: 29%;
}

.story-system-map[data-step="1"] .story-friction {
  opacity: 1;
  transform: none;
}

.story-core {
  position: absolute;
  z-index: 8;
  left: 50%;
  top: 50%;
  display: grid;
  place-items: center;
  width: 136px;
  height: 136px;
  padding: 18px;
  border: 1px solid var(--line-2);
  border-radius: 36px;
  background: color-mix(in srgb, var(--bg-2) 92%, transparent);
  box-shadow: 0 22px 50px rgba(2, 10, 28, .3);
  opacity: calc(.26 + var(--connect-progress) * .74);
  transform: translate(-50%, -50%) scale(calc(.86 + var(--connect-progress) * .14 + var(--core-pulse)));
  transition: border-color 240ms ease, box-shadow 240ms ease;
  will-change: transform, opacity;
}

.story-core::before,
.story-core::after {
  content: "";
  position: absolute;
  inset: -12px;
  border: 1px solid color-mix(in srgb, var(--cyan) 52%, transparent);
  border-radius: 44px;
  opacity: calc(var(--connect-progress) * .62);
  transform: rotate(var(--story-orbit-a));
  will-change: transform, opacity;
}

.story-core::after {
  inset: -24px;
  border-color: color-mix(in srgb, var(--ocean-light) 30%, transparent);
  border-radius: 52px;
  opacity: calc(var(--connect-progress) * .28);
  border-style: dashed;
  transform: rotate(var(--story-orbit-b));
}

.story-core-mark {
  position: relative;
  width: 70px;
  height: 70px;
  transform: translate3d(0, var(--story-core-float), 0) rotate(var(--story-mark-tilt));
  transform-origin: 50% 56%;
  will-change: transform;
}

.story-core-mark i {
  position: absolute;
  width: 20px;
  height: 20px;
  border-radius: 5px;
  background: linear-gradient(145deg, var(--ocean-light), var(--ocean));
  box-shadow: 0 8px 18px rgba(13, 94, 255, .2);
}

.story-core-mark i:nth-child(1) {
  left: 0;
  top: 0;
}

.story-core-mark i:nth-child(2) {
  left: 0;
  top: 25px;
}

.story-core-mark i:nth-child(3) {
  left: 25px;
  top: 25px;
}

.story-core-mark i:nth-child(4) {
  left: 0;
  top: 50px;
  background: var(--cyan);
  box-shadow: 0 0 20px color-mix(in srgb, var(--cyan) 58%, transparent);
}

.story-core-mark i:nth-child(5) {
  left: 25px;
  top: 50px;
}

.story-core-mark i:nth-child(6) {
  left: 50px;
  top: 50px;
}

.story-core > span {
  margin-top: 8px;
  color: var(--ink-mute);
  font-family: var(--mono);
  font-size: 7px;
  letter-spacing: .14em;
  text-transform: uppercase;
}

.story-system-map[data-step="3"] .story-core,
.story-system-map[data-step="4"] .story-core {
  border-color: color-mix(in srgb, var(--cyan) 68%, var(--line-2));
  box-shadow: 0 24px 60px color-mix(in srgb, var(--ocean) 26%, transparent);
}

.story-system-map[data-step="4"] .story-core {
  transform: translate(-50%, -50%) scale(calc(1.04 + var(--core-pulse)));
}

.story-outcome {
  position: absolute;
  z-index: 7;
  left: 50%;
  top: 12%;
  display: flex;
  align-items: center;
  gap: 8px;
  color: var(--ink);
  font-family: var(--mono);
  font-size: 8px;
  letter-spacing: .13em;
  text-transform: uppercase;
  opacity: var(--outcome-progress);
  transform: translate(-50%, calc(12px - var(--outcome-progress) * 12px));
}

.story-outcome i {
  width: 7px;
  height: 7px;
  border-radius: 2px;
  background: var(--cyan);
  box-shadow: 0 0 14px var(--cyan);
}

.story-progress {
  position: absolute;
  z-index: 19;
  right: 28px;
  top: 50%;
  display: flex;
  flex-direction: column;
  gap: 8px;
  transform: translateY(-50%);
}

.story-progress i {
  --fill: 0;
  width: 3px;
  height: 34px;
  overflow: hidden;
  border-radius: 99px;
  background: var(--line-2);
}

.story-progress i::after {
  content: "";
  display: block;
  width: 100%;
  height: 100%;
  background: var(--cyan);
  transform: scaleY(var(--fill));
  transform-origin: top;
}

@media (max-width: 850px) {
  .system-story {
    height: 575svh;
  }

  .system-story-sticky {
    height: 100svh;
    min-height: 0;
    padding: 76px 0 24px;
  }

  .system-story .wrap {
    width: calc(100% - 30px);
  }

  .system-story-grid {
    grid-template-columns: 1fr;
    gap: 10px;
    height: 100%;
    align-content: center;
  }

  .story-copy-stage {
    min-height: 232px;
  }

  .story-chapter {
    justify-content: flex-start;
  }

  .story-count {
    margin-bottom: 14px;
  }

  .story-chapter h2 {
    font-size: clamp(38px, 10.8vw, 54px);
  }

  .story-chapter p {
    margin-top: 15px;
    font-size: 13.5px;
    line-height: 1.52;
  }

  .story-list {
    gap: 6px;
    margin-top: 14px;
  }

  .story-list span {
    gap: 8px;
    font-size: 11.5px;
  }

  .story-system-map {
    width: min(82vw, 320px);
    justify-self: center;
    border-radius: 22px;
    background-size: 34px 34px, 34px 34px, auto, auto;
  }

  .story-system-map::before {
    inset: 8px;
    border-radius: 16px;
  }

  .story-stage-head,
  .story-stage-foot {
    left: 17px;
    right: 17px;
    font-size: 5.5px;
  }

  .story-stage-head {
    top: 15px;
  }

  .story-stage-foot {
    bottom: 14px;
  }

  .story-node {
    width: 84px;
    height: 50px;
    padding: 8px 9px;
    column-gap: 6px;
    border-radius: 11px;
  }

  .story-node > span {
    font-size: 5.5px;
  }

  .story-node strong {
    font-size: 10px;
  }

  .story-node small {
    margin-top: 3px;
    font-size: 5px;
  }

  .story-node.n1,
  .story-node.n2 {
    top: 22%;
  }

  .story-node.n3,
  .story-node.n4 {
    bottom: 22%;
  }

  .story-system-map[data-step="4"] .story-node.n1 {
    transform: translate(12px, 11px) scale(.91);
  }

  .story-system-map[data-step="4"] .story-node.n2 {
    transform: translate(-12px, 11px) scale(.91);
  }

  .story-system-map[data-step="4"] .story-node.n3 {
    transform: translate(12px, -11px) scale(.91);
  }

  .story-system-map[data-step="4"] .story-node.n4 {
    transform: translate(-12px, -11px) scale(.91);
  }

  .story-friction {
    padding: 3px 5px;
    font-size: 4.6px;
  }

  .story-friction::before {
    width: 3px;
    height: 3px;
    margin-right: 3px;
  }

  .story-core {
    width: 86px;
    height: 86px;
    padding: 11px;
    border-radius: 24px;
  }

  .story-core::before {
    inset: -8px;
    border-radius: 29px;
  }

  .story-core::after {
    inset: -15px;
    border-radius: 35px;
  }

  .story-core-mark {
    width: 46px;
    height: 46px;
  }

  .story-core-mark i {
    width: 13px;
    height: 13px;
    border-radius: 3px;
  }

  .story-core-mark i:nth-child(2),
  .story-core-mark i:nth-child(3) {
    top: 16px;
  }

  .story-core-mark i:nth-child(3),
  .story-core-mark i:nth-child(5) {
    left: 16px;
  }

  .story-core-mark i:nth-child(4),
  .story-core-mark i:nth-child(5),
  .story-core-mark i:nth-child(6) {
    top: 32px;
  }

  .story-core-mark i:nth-child(6) {
    left: 32px;
  }

  .story-core > span {
    margin-top: 5px;
    font-size: 4.5px;
  }

  .story-outcome {
    top: 12%;
    gap: 5px;
    font-size: 5px;
  }

  .story-outcome i {
    width: 4px;
    height: 4px;
  }

  .story-progress {
    left: 50%;
    right: auto;
    top: auto;
    bottom: 12px;
    flex-direction: row;
    transform: translateX(-50%);
  }

  .story-progress i {
    width: 28px;
    height: 3px;
  }

  .story-progress i::after {
    transform: scaleX(var(--fill));
    transform-origin: left;
  }
}

@media (min-width: 851px) and (max-height: 680px) {
  .story-copy-stage {
    min-height: 380px;
  }

  .story-count {
    margin-bottom: 14px;
  }

  .story-chapter h2 {
    font-size: clamp(44px, 5vw, 66px);
  }

  .story-chapter p {
    margin-top: 18px;
    font-size: 17px;
    line-height: 1.45;
  }

  .story-list {
    gap: 8px;
    margin-top: 18px;
  }

  .story-chapter .btn {
    margin-top: 18px !important;
  }
}

@media (max-width: 850px) and (max-height: 700px) {
  .system-story-sticky {
    padding: 68px 0 10px;
  }

  .system-story-grid {
    gap: 6px;
  }

  .story-copy-stage {
    min-height: 224px;
  }

  .story-count {
    margin-bottom: 8px;
    font-size: 8px;
  }

  .story-chapter h2 {
    font-size: clamp(32px, 9.5vw, 42px);
    line-height: .94;
  }

  .story-chapter p {
    margin-top: 10px;
    font-size: 12.5px;
    line-height: 1.42;
  }

  .story-list {
    gap: 4px;
    margin-top: 10px;
  }

  .story-list span {
    font-size: 10.5px;
  }

  .story-chapter .btn {
    margin-top: 12px !important;
    padding: 11px 16px;
    font-size: 12px;
  }

  .story-system-map {
    width: min(76vw, calc(100svh - 320px), 300px);
  }
}

@media (prefers-reduced-motion: reduce) {
  .system-story {
    height: auto;
    padding: 100px 0;
  }

  .system-story-sticky {
    position: relative;
    height: auto;
  }

  .system-story-grid {
    grid-template-columns: 1fr;
  }

  .story-copy-stage {
    display: grid;
    gap: 45px;
  }

  .story-chapter {
    position: relative;
    opacity: 1;
    transform: none;
  }

  .story-system-map,
  .story-progress {
    display: none;
  }
}