:root {
  color-scheme: dark;
  --bg: #0c1118;
  --fg: #eef2f4;
  --muted: #c2cbd3;
  --cyan: #8ee7ed;
  --rule: #46535f;
  --gutter: clamp(24px, 4vw, 72px);
}
* {
  box-sizing: border-box;
}
html,
body,
#journey,
.stage {
  overflow-anchor: none;
}
body {
  margin: 0;
  background: var(--bg);
  color: var(--fg);
  font-family: Helvetica, Arial, sans-serif;
}
[hidden] {
  display: none !important;
}
#journey {
  height: 1400vh;
}
.stage {
  height: 100svh;
  min-height: 540px;
  position: sticky;
  top: 0;
  overflow: hidden;
  background: var(--bg);
}
header {
  position: absolute;
  z-index: 5;
  top: 0;
  left: var(--gutter);
  height: 88px;
  display: flex;
  align-items: center;
}
.brand {
  font-size: 21px;
  font-weight: 700;
  letter-spacing: -0.7px;
}
.visual {
  position: absolute;
  inset: 0 0 0 23%;
  transition: opacity 0.25s;
}
.visual canvas {
  width: 100%;
  height: 100%;
  object-fit: cover;
  /* Fade the image itself so its inset never leaves a visible vertical edge. */
  mask-image: linear-gradient(
    90deg,
    transparent 0%,
    #0000000d 5%,
    #00000040 12%,
    #0000008c 21%,
    #000000d1 30%,
    #000 42%
  );
}
.stage:after {
  content: "";
  position: absolute;
  inset: 0;
  pointer-events: none;
  background:
    linear-gradient(
      90deg,
      #0c1118 0%,
      #0c1118fa 18%,
      #0c1118e0 30%,
      #0c111899 43%,
      #0c111838 58%,
      transparent 76%
    ),
    linear-gradient(0deg, #0c11188c 0%, #0c111840 12%, transparent 40%);
}
#media-status {
  position: absolute;
  right: 5%;
  bottom: 5%;
  font-size: 12px;
  color: var(--muted);
  z-index: 4;
}
.copy {
  position: absolute;
  z-index: 2;
  left: var(--gutter);
  top: 23%;
  width: 40%;
  max-width: 600px;
}
h1 {
  font-size: clamp(32px, 3.6vw, 58px);
  font-weight: 400;
  letter-spacing: -0.035em;
  line-height: 1.08;
  margin: 0;
  text-wrap: balance;
}
.description {
  font-size: clamp(17px, 1.4vw, 21px);
  line-height: 1.55;
  max-width: 440px;
  color: var(--muted);
  margin: 24px 0 0;
}
.phase {
  font-size: 12px;
  color: var(--cyan);
  margin: 0 0 20px;
}
.phase:empty,
.description:empty {
  display: none;
}
.small-label,
#token-label {
  font-size: 11px;
  color: var(--muted);
  letter-spacing: 0.06em;
  text-transform: uppercase;
}
#opening-prompt {
  display: none;
  border-top: 1px solid var(--rule);
  margin-top: 34px;
  padding-top: 20px;
  max-width: 400px;
}
#opening-prompt p {
  font-size: 20px;
  margin: 12px 0 0;
}
#scroll-cue {
  display: none;
  font-size: 12px;
  color: var(--cyan);
  margin-top: 32px;
}
.opening #opening-prompt,
.opening #scroll-cue {
  display: block;
}
#tokens {
  position: absolute;
  z-index: 3;
  left: 55%;
  right: var(--gutter);
  bottom: 32%;
  pointer-events: none;
}
#token-label {
  margin: 0;
  line-height: 1.5;
}
#token-context {
  font-size: 17px;
  line-height: 1.5;
  margin: 10px 0 18px;
}
#token-list {
  display: flex;
  flex-wrap: wrap;
  gap: 7px;
}
.token {
  padding: 8px 10px;
  background: #12242bf5;
  border: 1px solid #63848b;
  border-radius: 3px;
  font-size: 15px;
  color: #d1f9fa;
  white-space: pre;
  transition:
    background 0.15s,
    border-color 0.15s;
}
.token.candidate {
  border-style: dashed;
  color: #c2cbd3;
}
.token.selected {
  border-style: solid;
  border-color: var(--cyan);
  background: #23505a;
  color: #fff;
}
.unsplit .token {
  border-color: transparent;
  background: transparent;
  padding: 8px 0;
}
#answer-panel {
  position: absolute;
  z-index: 3;
  left: 55%;
  right: var(--gutter);
  top: 27%;
  max-width: 620px;
}
.answer-prompt {
  border-top: 1px solid var(--rule);
  padding-top: 20px;
}
.answer-prompt p {
  font-size: 20px;
  line-height: 1.5;
  margin: 12px 0 26px;
}
.answer-content {
  border-top: 1px solid var(--rule);
  padding-top: 20px;
}
.answer-content p {
  font-size: clamp(18px, 1.65vw, 24px);
  line-height: 1.55;
  margin: 12px 0;
  overflow-wrap: break-word;
}
#answer:after {
  content: "";
  display: inline-block;
  width: 2px;
  height: 1em;
  background: var(--cyan);
  margin-left: 4px;
  vertical-align: -2px;
}
#answer-panel.complete #answer:after {
  display: none;
}
.streaming #answer-panel {
  top: 70%;
}
.streaming .answer-prompt {
  display: none;
}
.streaming .answer-content p {
  font-size: 18px;
}
.streaming #tokens {
  bottom: 36%;
}
.ending .visual {
  opacity: 0.25;
}
.ending .copy {
  top: 23%;
}
.ending h1 {
  font-size: clamp(30px, 3.2vw, 52px);
}
.noscript {
  padding: 24px;
}
@media (max-width: 760px) {
  #journey {
    height: 1500vh;
  }
  header {
    height: 64px;
  }
  .brand {
    font-size: 19px;
  }
  .visual {
    inset: 24% -20% 0 -20%;
  }
  .visual canvas {
    mask-image: linear-gradient(180deg, transparent, #00000080 10%, #000 24%);
  }
  .stage:after {
    background: linear-gradient(
      180deg,
      #0c1118 0%,
      #0c1118f5 25%,
      #0c1118ad 42%,
      #0c11181a 60%,
      #0c1118ee 88%
    );
  }
  .copy {
    top: 90px;
    width: calc(100% - 48px);
    max-width: none;
  }
  h1 {
    font-size: clamp(27px, 7vw, 38px);
    line-height: 1.08;
  }
  .description {
    font-size: 16px;
    line-height: 1.45;
    margin-top: 16px;
    max-width: 440px;
  }
  .phase {
    font-size: 11px;
    margin-bottom: 12px;
  }
  #opening-prompt {
    margin-top: 24px;
    padding-top: 16px;
  }
  #opening-prompt p {
    font-size: 18px;
    margin-top: 10px;
  }
  #scroll-cue {
    margin-top: 22px;
  }
  .opening .visual {
    inset: 32% -20% 0;
  }
  .opening:after {
    background: linear-gradient(
      180deg,
      #0c1118 0%,
      #0c1118f5 32%,
      #0c1118a6 52%,
      #0c111815 80%
    );
  }
  #tokens {
    left: 24px;
    right: 24px;
    bottom: 8%;
  }
  #token-label,
  .small-label {
    font-size: 10px;
  }
  #token-context {
    font-size: 15px;
    margin: 8px 0 12px;
  }
  .token {
    font-size: 13px;
    padding: 7px 8px;
  }
  .streaming #tokens {
    bottom: 30%;
  }
  .streaming #answer-panel {
    top: 75%;
    left: 24px;
    right: 24px;
  }
  .streaming .answer-content {
    padding-top: 10px;
  }
  .streaming .answer-content p {
    font-size: 15px;
    line-height: 1.4;
    margin-top: 8px;
  }
  .ending .copy {
    top: 90px;
    width: calc(100% - 48px);
  }
  .ending h1 {
    font-size: clamp(27px, 6.8vw, 36px);
  }
  .ending .description {
    font-size: 15px;
  }
  .ending #answer-panel {
    top: 53%;
    left: 24px;
    right: 24px;
  }
  .answer-prompt {
    padding-top: 12px;
  }
  .answer-prompt p {
    font-size: 16px;
    margin: 8px 0 16px;
  }
  .answer-content {
    padding-top: 12px;
  }
  .answer-content p {
    font-size: 16px;
    line-height: 1.45;
    margin-top: 8px;
  }
}
@media (max-height: 650px) and (max-width: 760px) {
  .copy,
  .ending .copy {
    top: 72px;
  }
  .description {
    font-size: 14px;
    line-height: 1.4;
    margin-top: 12px;
  }
  h1,
  .ending h1 {
    font-size: 27px;
  }
  .phase {
    margin-bottom: 8px;
  }
  .ending .description {
    font-size: 14px;
  }
  .ending #answer-panel {
    top: 52%;
  }
  .answer-content p {
    font-size: 14px;
  }
  .answer-prompt p {
    margin-bottom: 10px;
  }
  .streaming #tokens {
    bottom: 28%;
  }
  .streaming #answer-panel {
    top: 77%;
  }
  .streaming .answer-content p {
    font-size: 13px;
  }
  #token-context {
    font-size: 13px;
    margin-bottom: 8px;
  }
  #opening-prompt {
    margin-top: 20px;
  }
}
@media (prefers-reduced-motion: reduce) {
  * {
    scroll-behavior: auto !important;
    transition: none !important;
  }
}

.token-scene:after {
  background:
    linear-gradient(
      90deg,
      #0c1118 0%,
      #0c1118ef 25%,
      #0c11189c 43%,
      #0c111833 70%
    ),
    linear-gradient(0deg, #0c1118f5 0%, #0c1118c9 45%, transparent 80%);
}
@media (max-width: 760px) {
  .token-scene:after {
    background: linear-gradient(
      180deg,
      #0c1118 0%,
      #0c1118f5 26%,
      #0c111840 48%,
      #0c1118c9 62%,
      #0c1118f5 85%
    );
  }
}