:root {
  color-scheme: light;
  --canvas: #fbfbfa;
  --canvas-rgb: 251, 251, 250;
  --paper: #ffffff;
  --paper-rgb: 255, 255, 255;
  --paper-blue: #f2f8fa;
  --paper-blue-rgb: 242, 248, 250;
  --ink: #18242d;
  --ink-soft: #48565f;
  --muted: #778188;
  --line: rgba(24, 36, 45, 0.15);
  --line-strong: rgba(24, 36, 45, 0.34);
  --blue: #007dce;
  --sky: #00bfe8;
  --green: #b9da19;
  --orange: #ef562c;
  --yellow: #f0ac30;
  --display:
    "Source Serif 4 Variable", "Noto Serif SC Variable", "Songti SC", serif;
  --body:
    "Source Sans 3 Variable", "Noto Sans SC Variable", "PingFang SC", sans-serif;
  --font-mono: ui-monospace, "SFMono-Regular", Consolas, monospace;
  --content: 1180px;
  --wide: 1320px;
}

/* Editorial task clips are distributed through the article as visual pauses. */
.story-clip {
  width: min(920px, 100%);
  margin-top: clamp(88px, 9vw, 138px);
}

.story-clip-left {
  margin-right: auto;
  margin-left: max(calc(50% - 520px), 0px);
}

.story-clip-right {
  margin-right: max(calc(50% - 520px), 0px);
  margin-left: auto;
}

.story-clip-heading {
  display: flex;
  align-items: baseline;
  justify-content: space-between;
  gap: 24px;
  margin-bottom: 18px;
}

.story-clip-heading > span,
.story-clip > p {
  color: var(--muted);
  font-family: ui-monospace, "SFMono-Regular", Consolas, monospace;
  font-size: 13px;
  letter-spacing: 0.08em;
  text-transform: uppercase;
}

.story-clip-heading h3 {
  margin: 0;
  color: var(--ink);
  font-family: var(--display);
  font-size: clamp(30px, 3vw, 42px);
  font-weight: 560;
  letter-spacing: -0.035em;
  line-height: 1;
}

.story-clip video {
  display: block;
  width: 100%;
  aspect-ratio: 16 / 9;
  border: 1px solid rgba(25, 54, 72, 0.12);
  border-radius: 22px;
  background: #071018;
  box-shadow: 0 24px 64px rgba(20, 39, 53, 0.14);
  object-fit: cover;
}

.story-clip > p {
  margin: 14px 0 0;
  text-align: right;
}

@media (max-width: 760px) {
  .story-clip {
    width: 100%;
    margin-top: 72px;
    margin-right: 0;
    margin-left: 0;
  }

  .story-clip-heading {
    align-items: flex-start;
    flex-direction: column;
    gap: 8px;
    margin-bottom: 14px;
  }

  .story-clip-heading h3 {
    font-size: 31px;
  }

  .story-clip video {
    border-radius: 16px;
  }
}

/* Small orbit accents echo the existing large blue background rings. */
.ambient-orbit {
  position: absolute;
  z-index: 0;
  width: clamp(112px, 10vw, 158px);
  aspect-ratio: 1;
  border: 1px solid rgba(0, 125, 206, 0.12);
  border-radius: 50%;
  box-shadow:
    0 0 0 clamp(20px, 2vw, 30px) rgba(0, 191, 232, 0.016),
    0 0 0 clamp(42px, 4vw, 62px) rgba(0, 125, 206, 0.008);
  pointer-events: none;
}

.ambient-orbit::before {
  position: absolute;
  inset: 24%;
  border: 1px solid rgba(0, 125, 206, 0.09);
  border-radius: 50%;
  content: "";
}

.ambient-orbit-hero {
  top: clamp(390px, 29vw, 460px);
  left: clamp(120px, 9vw, 150px);
  width: clamp(96px, 8vw, 120px);
  box-shadow:
    0 0 0 12px rgba(0, 191, 232, 0.016),
    0 0 0 22px rgba(0, 125, 206, 0.008);
}

@media (min-width: 1801px) {
  .ambient-orbit-hero {
    left: clamp(120px, 7vw, 150px);
  }
}

.section-intro > p {
  position: relative;
}

.section-intro > p > .ambient-orbit-section {
  top: 36px;
  right: calc(100% + 42px);
  left: auto;
  z-index: 0;
  width: 96px;
  box-shadow:
    0 0 0 12px rgba(0, 191, 232, 0.016),
    0 0 0 22px rgba(0, 125, 206, 0.008);
}

html[data-lang="zh"] .section-intro > p > .ambient-orbit-section {
  top: 28px;
  right: calc(100% + 34px);
}

@media (max-width: 1180px) {
  .ambient-orbit {
    display: none;
  }
}

* {
  box-sizing: border-box;
}

html {
  scroll-behavior: smooth;
  scroll-padding-top: 92px;
  scrollbar-gutter: stable;
}
html[data-lang="zh"] .lang-en,
html[data-lang="en"] .lang-zh {
  display: none !important;
}

body {
  margin: 0;
  overflow-x: hidden;
  color: var(--ink);
  background: var(--canvas);
  font-family: var(--body);
  font-size: 18px;
  font-variation-settings: "wght" 400;
  line-height: 1.65;
  text-rendering: optimizeLegibility;
  -webkit-font-smoothing: antialiased;
}

body::before {
  position: fixed;
  inset: 0;
  z-index: -1;
  pointer-events: none;
  background:
    radial-gradient(
      circle at 78% 10%,
      rgba(0, 191, 232, 0.08),
      transparent 24%
    ),
    radial-gradient(
      circle at 10% 66%,
      rgba(0, 125, 206, 0.045),
      transparent 22%
    );
  content: "";
}

a {
  color: inherit;
  text-decoration: none;
}
button {
  color: inherit;
  font: inherit;
}
img,
svg,
video {
  display: block;
  max-width: 100%;
}
h1,
h2,
h3,
p,
figure,
blockquote {
  margin: 0;
}
button:focus:not(:focus-visible) {
  outline: none;
}
button:focus-visible,
a:focus-visible {
  outline: 2px solid var(--blue);
  outline-offset: 4px;
}

.skip-link {
  position: fixed;
  top: 10px;
  left: 10px;
  z-index: 100;
  padding: 10px 14px;
  background: var(--ink);
  color: #fff;
  transform: translateY(-160%);
}
.skip-link:focus {
  transform: none;
}

.site-header {
  position: sticky;
  top: 0;
  z-index: 50;
  display: grid;
  grid-template-columns: 190px 1fr auto;
  gap: 34px;
  align-items: center;
  min-height: 82px;
  padding: 11px max(34px, calc((100vw - var(--wide)) / 2));
  border-bottom: 1px solid transparent;
  background: rgba(var(--canvas-rgb), 0.92);
  backdrop-filter: blur(18px);
  transition:
    min-height 180ms ease,
    border-color 180ms ease,
    background 180ms ease;
}
.site-header.is-scrolled {
  min-height: 70px;
  border-color: var(--line);
  background: rgba(var(--paper-rgb), 0.96);
}
.brand {
  display: block;
  width: 172px;
  height: 54px;
  overflow: hidden;
}
.brand img {
  width: 176px;
  height: 71px;
  object-fit: contain;
  object-position: center;
  transform: translateY(-8px);
}
.site-nav {
  display: flex;
  justify-content: center;
  gap: clamp(18px, 2.4vw, 38px);
}
.site-nav a {
  position: relative;
  padding: 8px 0;
  color: var(--ink-soft);
  font-size: 15px;
  font-weight: 520;
  line-height: 1;
}
.site-nav a::after {
  position: absolute;
  right: 0;
  bottom: 0;
  left: 0;
  height: 1px;
  background: var(--ink);
  content: "";
  transform: scaleX(0);
  transform-origin: left;
  transition: transform 150ms ease;
}
.site-nav a:hover::after,
.site-nav a.is-active::after {
  transform: scaleX(1);
}

.language-switch {
  display: flex;
  gap: 7px;
  align-items: center;
  color: var(--muted);
  font-size: 14px;
}
.language-switch button {
  padding: 6px 3px;
  border: 0;
  background: none;
  cursor: pointer;
  opacity: 0.55;
}
.language-switch button[aria-pressed="true"] {
  color: var(--ink);
  font-weight: 650;
  opacity: 1;
}
.menu-button,
.mobile-menu {
  display: none;
}

.article-hero {
  max-width: var(--content);
  margin: 0 auto;
  padding: 118px 24px 142px;
  text-align: center;
}
.edition {
  display: flex;
  justify-content: center;
  gap: 13px;
  align-items: center;
  margin-bottom: 36px;
  color: var(--blue);
  font-size: 15px;
  font-weight: 650;
  letter-spacing: 0.12em;
  text-transform: uppercase;
}
.edition i {
  width: 4px;
  height: 4px;
  border-radius: 50%;
  background: var(--green);
}
.article-hero h1 {
  max-width: 1080px;
  margin: 0 auto;
  font-family: var(--display);
  font-size: clamp(66px, 7.4vw, 104px);
  font-weight: 430;
  font-variation-settings: "wght" 430;
  letter-spacing: -0.055em;
  line-height: 1.02;
  text-align: left;
}
html[data-lang="en"] .article-hero h1 {
  font-size: clamp(68px, 7vw, 100px);
  letter-spacing: -0.05em;
  line-height: 0.98;
}
.article-hero h1 > span {
  display: block;
}
.accent {
  color: var(--blue);
  white-space: nowrap;
}
.hero-thesis {
  max-width: 940px;
  margin: 44px auto 0;
  color: var(--ink);
  font-family: var(--display);
  font-size: clamp(34px, 3.9vw, 56px);
  font-weight: 440;
  letter-spacing: -0.035em;
  line-height: 1.1;
  text-align: left;
}
.hero-thesis > span {
  display: block;
}
html[data-lang="en"] .hero-thesis {
  max-width: 1020px;
  font-size: clamp(32px, 3.6vw, 52px);
}
.dek {
  max-width: 820px;
  margin: 42px auto 0;
  color: var(--ink-soft);
  font-size: 20px;
  line-height: 1.72;
}
html[data-lang="en"] .dek {
  max-width: 900px;
  font-size: 21px;
}
.article-meta {
  display: grid;
  grid-template-columns: repeat(3, minmax(0, 1fr));
  max-width: 930px;
  margin: 68px auto 0;
  border-top: 1px solid var(--line-strong);
  border-bottom: 1px solid var(--line);
  text-align: left;
}
.article-meta div {
  min-height: 92px;
  padding: 20px 20px 17px;
  border-left: 1px solid var(--line);
}
.article-meta div:first-child {
  border-left: 0;
}
.article-meta div > span {
  display: block;
  margin-bottom: 8px;
  color: var(--muted);
  font-size: 14px;
  letter-spacing: 0.06em;
  text-transform: uppercase;
}
.article-meta strong {
  display: block;
  font-size: 16px;
  font-weight: 520;
  line-height: 1.35;
}

.hero-media {
  position: relative;
  margin-top: 82px;
  text-align: left;
}
.media-label {
  display: flex;
  justify-content: space-between;
  align-items: center;
  padding: 0 2px 12px;
  color: var(--muted);
  font-size: 15px;
}
.media-label span:first-child {
  color: var(--ink);
  font-weight: 650;
}
.hero-media video {
  width: 100%;
  aspect-ratio: 16 / 9;
  border-radius: 18px;
  background: #10181c;
  object-fit: cover;
  box-shadow: 0 28px 60px rgba(24, 36, 45, 0.16);
}
figcaption {
  display: grid;
  grid-template-columns: 106px 1fr;
  gap: 18px;
  padding: 17px 2px 0;
  color: var(--muted);
  font-size: 15px;
  line-height: 1.58;
  text-align: left;
}
.figure-number {
  color: var(--ink);
  font-weight: 650;
}

.article-section {
  max-width: var(--content);
  margin: 0 auto;
  padding: 130px 24px;
  border-top: 1px solid var(--line-strong);
}
.section-index {
  display: grid;
  grid-template-columns: 62px 1fr;
  gap: 16px;
  align-items: center;
  margin-bottom: 66px;
  color: var(--muted);
  font-size: 13px;
  font-weight: 600;
  letter-spacing: 0.1em;
  text-transform: uppercase;
}
.section-index > span:first-child {
  color: var(--blue);
  font-family: var(--display);
  font-size: 28px;
  font-weight: 500;
  letter-spacing: -0.02em;
}
.section-intro {
  display: grid;
  grid-template-columns: minmax(0, 1.32fr) minmax(300px, 0.68fr);
  gap: clamp(44px, 7vw, 110px);
  align-items: start;
}
.section-intro h2 {
  max-width: 760px;
  font-family: var(--display);
  font-size: clamp(48px, 5.1vw, 72px);
  font-weight: 430;
  font-variation-settings: "wght" 430;
  letter-spacing: -0.045em;
  line-height: 1.08;
}
html[data-lang="en"] .section-intro h2 {
  font-size: clamp(47px, 4.8vw, 68px);
}
.section-intro p {
  max-width: 440px;
  padding-top: 9px;
  color: var(--ink-soft);
  line-height: 1.8;
}
.thesis {
  max-width: 980px;
  margin: 112px auto;
  padding-left: 48px;
  border-left: 4px solid var(--blue);
}
.thesis p {
  font-family: var(--display);
  font-size: clamp(40px, 4.3vw, 58px);
  font-weight: 420;
  letter-spacing: -0.04em;
  line-height: 1.22;
}

.continuity-figure,
.engine-figure,
.scaling-figure,
.model-figure {
  margin-top: 86px;
}
.continuity-figure svg,
.engine-figure svg,
.model-figure svg {
  width: 100%;
  border-radius: 24px;
  box-shadow: 0 18px 50px rgba(24, 36, 45, 0.07);
}
.figure-paper {
  fill: var(--paper);
  stroke: var(--line);
}
.figure-heading {
  fill: var(--ink);
  font: 530 25px var(--body);
}
.figure-sub {
  fill: var(--muted);
  font: 400 15px var(--body);
}
.soft-orb {
  opacity: 0.88;
}
.orb-green {
  fill: rgba(185, 218, 25, 0.42);
}
.orb-yellow {
  fill: rgba(240, 172, 48, 0.38);
}
.orb-orange {
  fill: rgba(239, 86, 44, 0.27);
}
.human-line {
  fill: none;
  stroke: var(--ink);
  stroke-width: 6;
  stroke-linecap: round;
}
.human-joint {
  fill: var(--paper);
  stroke: var(--ink);
  stroke-width: 4;
}
.continuity-ribbon {
  fill: none;
  stroke: url(#continuity-ribbon);
  stroke-width: 38;
  stroke-linecap: round;
}
.continuity-ribbon-thin {
  fill: none;
  stroke: rgba(0, 125, 206, 0.22);
  stroke-width: 7;
  stroke-linecap: round;
  stroke-dasharray: 2 20;
}
.stage-card rect {
  fill: #fff;
  stroke: var(--line);
}
.stage-title {
  fill: var(--ink);
  font: 620 23px var(--body);
}
.stage-copy {
  fill: var(--muted);
  font: 400 14px var(--body);
}
.dot-green {
  fill: var(--green);
}
.dot-orange {
  fill: var(--orange);
}
.capability-orbit > circle:first-child {
  fill: rgba(0, 191, 232, 0.12);
  stroke: rgba(0, 125, 206, 0.28);
  stroke-width: 2;
}
.capability-orbit > circle:nth-child(2) {
  fill: #fff;
  stroke: var(--blue);
  stroke-width: 2;
}
.capability-orbit path {
  fill: none;
  stroke: var(--blue);
  stroke-width: 5;
  stroke-linecap: round;
}
.capability-orbit circle:not(:first-child):not(:nth-child(2)) {
  fill: var(--paper);
  stroke: var(--blue);
  stroke-width: 3;
}
.end-label {
  text-anchor: middle;
}

.principle-grid {
  display: grid;
  grid-template-columns: repeat(3, 1fr);
  margin-top: 82px;
  border-top: 1px solid var(--line-strong);
}
.principle-grid article {
  position: relative;
  min-height: 275px;
  padding: 38px 34px;
  border-left: 1px solid var(--line);
}
.principle-grid article:first-child {
  border-left: 0;
}
.principle-mark {
  display: block;
  width: 12px;
  height: 12px;
  border-radius: 50%;
}
.principle-mark.green {
  background: var(--green);
}
.principle-mark.orange {
  background: var(--orange);
}
.principle-mark.blue {
  background: var(--blue);
}
.principle-grid h3 {
  margin-top: 58px;
  font-family: var(--display);
  font-size: 31px;
  font-weight: 480;
  letter-spacing: -0.035em;
  line-height: 1.22;
}
.principle-grid p {
  margin-top: 20px;
  color: var(--muted);
  font-size: 16px;
  line-height: 1.75;
}

.distribution-layout {
  display: grid;
  grid-template-columns: 1.05fr 0.95fr;
  gap: clamp(42px, 7vw, 100px);
  align-items: center;
  margin-top: 92px;
}
.field-figure svg {
  width: 100%;
  border-radius: 24px;
  box-shadow: 0 18px 50px rgba(24, 36, 45, 0.07);
}
.field-rings circle {
  fill: none;
  stroke: rgba(0, 125, 206, 0.16);
  stroke-width: 1.5;
}
.field-paths path {
  fill: none;
  stroke: rgba(0, 125, 206, 0.34);
  stroke-width: 2;
  stroke-dasharray: 6 10;
}
.field-node circle:first-child {
  opacity: 0.32;
}
.field-node circle:last-child {
  fill: var(--paper);
  stroke-width: 4;
}
.field-node.sage circle:first-child {
  fill: var(--green);
}
.field-node.sage circle:last-child {
  stroke: var(--green);
}
.field-node.yellow circle:first-child {
  fill: var(--yellow);
}
.field-node.yellow circle:last-child {
  stroke: var(--yellow);
}
.field-node.orange circle:first-child {
  fill: var(--orange);
}
.field-node.orange circle:last-child {
  stroke: var(--orange);
}
.field-core > circle:first-child {
  fill: #fff;
  stroke: var(--blue);
  stroke-width: 2;
}
.field-core path {
  fill: none;
  stroke: var(--blue);
  stroke-width: 4.5;
  stroke-linecap: round;
}
.field-core circle:not(:first-child) {
  fill: #fff;
  stroke: var(--blue);
  stroke-width: 3;
}
.field-label {
  fill: var(--ink);
  stroke: rgba(var(--paper-rgb), 0.96);
  stroke-width: 12px;
  stroke-linejoin: round;
  paint-order: stroke fill;
  font: 600 18px var(--body);
  text-anchor: middle;
}
.overline {
  color: var(--blue);
  font-size: 15px;
  font-weight: 650;
  letter-spacing: 0.08em;
  text-transform: uppercase;
}
.field-copy h3 {
  margin-top: 34px;
  font-family: var(--display);
  font-size: clamp(43px, 4vw, 58px);
  font-weight: 430;
  letter-spacing: -0.045em;
  line-height: 1.12;
}
.field-copy > p:not(.overline) {
  margin-top: 30px;
  color: var(--ink-soft);
  line-height: 1.82;
}
.scale-note {
  margin-top: 38px;
  padding: 24px 26px;
  border-left: 3px solid var(--blue);
  background: rgba(0, 125, 206, 0.065);
  color: var(--ink-soft);
  font-size: 16px;
  line-height: 1.7;
}
.metric-strip {
  display: grid;
  grid-template-columns: repeat(4, 1fr);
  margin-top: 82px;
  border-top: 1px solid var(--line-strong);
  border-bottom: 1px solid var(--line);
}
.metric-strip article {
  padding: 32px 24px;
  border-left: 1px solid var(--line);
}
.metric-strip article:first-child {
  border-left: 0;
}
.metric-strip strong {
  display: block;
  font-family: var(--display);
  font-size: clamp(36px, 3.5vw, 50px);
  font-weight: 450;
  letter-spacing: -0.05em;
  line-height: 1;
}
.metric-strip article:nth-child(2) strong {
  color: var(--blue);
}
.metric-strip article:nth-child(3) strong {
  color: var(--orange);
}
.metric-strip article:nth-child(4) strong {
  color: #9ab600;
}
.metric-strip span {
  display: block;
  margin-top: 13px;
  color: var(--muted);
  font-size: 14px;
  line-height: 1.35;
}

.engine-stage > circle:first-child {
  fill: #fff;
  stroke: var(--line);
  stroke-width: 2;
}
.engine-stage > circle:not(:first-child) {
  fill: var(--green);
}
.engine-stage path {
  fill: none;
  stroke: var(--blue);
  stroke-width: 4;
  stroke-linecap: round;
  stroke-linejoin: round;
}
.engine-stage text {
  text-anchor: middle;
}
.engine-stage.stage-b > circle:not(:first-child) {
  fill: #fff;
  stroke: var(--blue);
  stroke-width: 2;
}
.engine-stage.stage-c > circle:first-child {
  fill: rgba(240, 172, 48, 0.18);
}
.engine-stage.stage-d > circle:first-child {
  fill: rgba(239, 86, 44, 0.12);
}
.engine-stage.stage-e > circle:first-child {
  stroke: none;
}
.engine-stage.stage-e path {
  stroke: #fff;
}
.engine-stage.stage-e > circle:not(:first-child) {
  fill: rgba(0, 125, 206, 0.9);
  stroke: #fff;
  stroke-width: 2;
}
.engine-main-line,
.engine-feedback-line {
  fill: none;
  stroke: #7c8a91;
  stroke-width: 2;
}
.engine-feedback-line {
  stroke-dasharray: 7 9;
}
.feedback-pill rect {
  fill: rgba(0, 125, 206, 0.08);
  stroke: rgba(0, 125, 206, 0.24);
}
.feedback-pill circle {
  fill: var(--blue);
}
.feedback-pill text {
  fill: var(--ink);
  font: 520 15px var(--body);
}
.engine-principles {
  display: grid;
  grid-template-columns: repeat(3, 1fr);
  margin-top: 72px;
}
.engine-principles article {
  padding: 36px 34px;
  border-top: 1px solid var(--line-strong);
  border-left: 1px solid var(--line);
}
.engine-principles article:first-child {
  border-left: 0;
}
.engine-principles article > span {
  color: var(--blue);
  font-size: 15px;
  font-weight: 650;
  letter-spacing: 0.06em;
  text-transform: uppercase;
}
.engine-principles h3 {
  margin-top: 45px;
  font-family: var(--display);
  font-size: 30px;
  font-weight: 470;
  letter-spacing: -0.035em;
  line-height: 1.25;
}
.engine-principles p {
  margin-top: 18px;
  color: var(--muted);
  font-size: 16px;
  line-height: 1.72;
}

.scaling-figure {
  overflow: hidden;
  border: 1px solid var(--line);
  border-radius: 24px;
  background: var(--paper);
  box-shadow: 0 18px 50px rgba(24, 36, 45, 0.06);
}
.figure-header {
  display: flex;
  justify-content: space-between;
  padding: 18px 24px;
  border-bottom: 1px solid var(--line);
  color: var(--muted);
  font-size: 15px;
}
.figure-header span:last-child {
  color: var(--ink);
  font-weight: 600;
}
.scaling-figure svg {
  width: 100%;
  padding: 16px 18px 0;
}
.scaling-figure figcaption {
  padding: 16px 24px 20px;
  border-top: 1px solid var(--line);
}
.chart-grid path {
  fill: none;
  stroke: rgba(24, 36, 45, 0.12);
  stroke-width: 1;
}
.y-labels text {
  fill: var(--muted);
  font: 400 13px var(--body);
  text-anchor: end;
}
.chart-area {
  fill: url(#chart-area);
}
.chart-line {
  fill: none;
  stroke: var(--blue);
  stroke-width: 5;
  stroke-linecap: round;
}
.chart-point circle:first-child {
  fill: var(--blue);
}
.chart-point circle:nth-child(2) {
  fill: none;
  stroke: rgba(0, 125, 206, 0.22);
  stroke-width: 2;
}
.chart-point text {
  fill: var(--ink);
  font: 600 17px var(--body);
  text-anchor: middle;
}
.chart-point text:nth-of-type(2) {
  font-size: 15px;
}
.chart-point text:nth-of-type(3) {
  fill: var(--muted);
  font-size: 12px;
  font-weight: 400;
}
.delta-badge rect {
  fill: rgba(239, 86, 44, 0.1);
  stroke: rgba(239, 86, 44, 0.28);
}
.delta-badge text {
  fill: var(--orange);
  font: 650 21px var(--body);
  text-anchor: middle;
}
.delta-badge text:last-child {
  font-size: 13px;
  font-weight: 500;
}
.model-label {
  fill: var(--ink);
  font: 620 20px var(--body);
}
.model-sub {
  fill: var(--muted);
  font: 400 14px var(--body);
}
.model-connector {
  fill: none;
  stroke: #7c8a91;
  stroke-width: 2;
}
.model-core > circle:first-child {
  filter: drop-shadow(0 24px 30px rgba(0, 125, 206, 0.2));
}
.model-core > circle:nth-child(2),
.model-core > circle:nth-child(3) {
  fill: none;
  stroke: rgba(255, 255, 255, 0.32);
  stroke-width: 2;
}
.model-core path {
  fill: none;
  stroke: #fff;
  stroke-width: 6;
  stroke-linecap: round;
}
.model-core circle:not(:first-child):not(:nth-child(2)):not(:nth-child(3)) {
  fill: var(--blue);
  stroke: #fff;
  stroke-width: 3;
}
.model-core text {
  fill: #fff;
  font: 650 32px var(--body);
  text-anchor: middle;
}
.model-core .model-core-sub {
  font-size: 14px;
  font-weight: 500;
}
.output-card rect {
  fill: #fff;
  stroke: var(--line);
}
.output-card path {
  fill: none;
  stroke: var(--blue);
  stroke-width: 4;
  stroke-linecap: round;
}
.output-card circle {
  fill: rgba(0, 125, 206, 0.08);
  stroke: var(--blue);
  stroke-width: 2;
}
.action-card path {
  stroke: var(--orange);
}
.action-card circle {
  fill: #fff;
  stroke: var(--orange);
  stroke-width: 3;
}
.output-card text {
  text-anchor: start;
}
.model-loop path {
  fill: none;
  stroke: #7c8a91;
  stroke-width: 2;
  stroke-dasharray: 7 9;
}
.model-loop rect {
  fill: #f2f5dc;
  stroke: rgba(154, 182, 0, 0.38);
}
.model-loop text {
  fill: var(--ink);
  font: 520 15px var(--body);
  text-anchor: middle;
}

.task-grid {
  display: grid;
  grid-template-columns: 1fr 1fr;
  gap: 82px 34px;
  margin-top: 88px;
}
.task-card {
  min-width: 0;
}
.task-screen {
  position: relative;
  width: 100%;
  overflow: hidden;
  padding: 0;
  border: 1px solid rgba(24, 36, 45, 0.2);
  border-radius: 18px;
  background: var(--paper);
  cursor: pointer;
  aspect-ratio: 16 / 9;
  transition:
    transform 180ms ease,
    box-shadow 180ms ease,
    border-color 180ms ease;
}
.task-screen:hover {
  transform: translateY(-3px);
  box-shadow: 0 22px 45px rgba(24, 36, 45, 0.12);
}
.task-screen.is-playing {
  border-color: var(--blue);
  box-shadow:
    0 0 0 2px rgba(0, 125, 206, 0.15),
    0 22px 45px rgba(24, 36, 45, 0.12);
}
.task-screen svg {
  width: 100%;
  height: 100%;
}
.task-index {
  position: absolute;
  top: 18px;
  left: 20px;
  z-index: 2;
  display: grid;
  place-items: center;
  width: 36px;
  height: 36px;
  border-radius: 50%;
  background: rgba(var(--paper-rgb), 0.82);
  color: var(--ink);
  font-size: 14px;
  font-weight: 650;
  backdrop-filter: blur(8px);
}
.play-icon {
  position: absolute;
  top: 50%;
  left: 50%;
  z-index: 4;
  width: 62px;
  height: 62px;
  border-radius: 50%;
  background: rgba(24, 36, 45, 0.82);
  box-shadow: 0 10px 30px rgba(0, 0, 0, 0.18);
  transform: translate(-50%, -50%);
  transition:
    transform 160ms ease,
    opacity 160ms ease;
}
.play-icon::after {
  position: absolute;
  top: 20px;
  left: 25px;
  width: 0;
  height: 0;
  border-top: 11px solid transparent;
  border-bottom: 11px solid transparent;
  border-left: 17px solid #fff;
  content: "";
}
.task-screen:hover .play-icon {
  transform: translate(-50%, -50%) scale(1.06);
}
.task-screen.is-playing .play-icon {
  opacity: 0;
}
.task-controls {
  position: absolute;
  right: 18px;
  bottom: 14px;
  left: 18px;
  z-index: 3;
  display: grid;
  grid-template-columns: 1fr auto auto;
  gap: 13px;
  align-items: center;
  color: rgba(255, 255, 255, 0.92);
  font-size: 13px;
}
.task-controls b {
  position: relative;
  height: 2px;
  background: rgba(255, 255, 255, 0.5);
}
.task-controls b::before {
  position: absolute;
  inset: 0 auto 0 0;
  width: 12%;
  background: var(--sky);
  content: "";
  transition: width 1.8s linear;
}
.task-screen.is-playing .task-controls b::before {
  width: 72%;
}
.task-controls em {
  font-style: normal;
}
.surface {
  fill: none;
  stroke: rgba(24, 36, 45, 0.45);
  stroke-width: 3;
}
.motion {
  fill: none;
  stroke: var(--blue);
  stroke-width: 4;
  stroke-dasharray: 8 7;
  stroke-linecap: round;
}
.motion-dot {
  fill: var(--blue);
}
.task-lego {
  background: linear-gradient(145deg, rgba(0, 191, 232, 0.1), var(--paper) 74%);
}
.lego-shadow rect {
  fill: rgba(24, 36, 45, 0.1);
}
.lego rect:nth-child(1) {
  fill: #377ebd;
}
.lego rect:nth-child(2) {
  fill: #f0ac30;
}
.lego rect:nth-child(3) {
  fill: #dc5435;
}
.lego circle {
  fill: rgba(255, 255, 255, 0.64);
}
.task-garment {
  background: linear-gradient(
    145deg,
    rgba(0, 125, 206, 0.075),
    var(--paper) 74%
  );
}
.cloth-shadow {
  fill: rgba(24, 36, 45, 0.09);
}
.cloth {
  fill: #f0ac30;
}
.bag {
  fill: rgba(0, 125, 206, 0.12);
  stroke: var(--blue);
  stroke-width: 3;
}
.bag-handle {
  fill: none;
  stroke: var(--blue);
  stroke-width: 3;
}
.task-box {
  background: linear-gradient(
    145deg,
    rgba(0, 191, 232, 0.085),
    var(--paper) 74%
  );
}
.box-fill {
  fill: rgba(0, 125, 206, 0.11);
}
.box,
.crease {
  fill: none;
  stroke: var(--blue);
  stroke-width: 3;
  stroke-linejoin: round;
}
.crease {
  stroke-dasharray: 6 5;
  opacity: 0.6;
}
.task-pack {
  background: linear-gradient(
    145deg,
    rgba(0, 125, 206, 0.065),
    var(--paper) 74%
  );
}
.slot-shadow,
.device-shadow {
  fill: rgba(24, 36, 45, 0.09);
}
.slot {
  fill: rgba(239, 86, 44, 0.1);
  stroke: var(--orange);
  stroke-width: 3;
}
.slot-inner {
  fill: none;
  stroke: rgba(239, 86, 44, 0.55);
  stroke-width: 2;
  stroke-dasharray: 5 5;
}
.device {
  fill: #fff;
  stroke: var(--blue);
  stroke-width: 3;
}
.device-dot {
  fill: var(--blue);
}
.task-lace {
  background: linear-gradient(
    145deg,
    rgba(0, 191, 232, 0.09),
    var(--paper) 74%
  );
}
.shoe-shadow {
  fill: rgba(24, 36, 45, 0.09);
}
.shoe {
  fill: rgba(185, 218, 25, 0.45);
  stroke: #7e9512;
  stroke-width: 3;
}
.sole {
  fill: none;
  stroke: rgba(24, 36, 45, 0.48);
  stroke-width: 3;
}
.eyelets circle {
  fill: #fff;
  stroke: var(--blue);
  stroke-width: 2;
}
.lace {
  fill: none;
  stroke: var(--blue);
  stroke-width: 3;
  stroke-linecap: round;
}
.task-drink {
  background: linear-gradient(
    145deg,
    rgba(0, 125, 206, 0.07),
    var(--paper) 74%
  );
}
.bottles path {
  fill: rgba(255, 255, 255, 0.6);
  stroke: var(--blue);
  stroke-width: 3;
}
.liquid path {
  fill: rgba(240, 172, 48, 0.52);
}
.glass {
  fill: rgba(255, 255, 255, 0.45);
  stroke: var(--orange);
  stroke-width: 3;
}
.glass-liquid {
  fill: rgba(239, 86, 44, 0.34);
}
.task-garment .motion,
.task-garment .motion-dot {
  transform: translate(-24px, -30px);
}
.task-box .motion,
.task-box .motion-dot {
  transform: translateY(-38px);
}
.task-pack .motion,
.task-pack .motion-dot {
  transform: translateY(-28px);
}
.task-drink .motion,
.task-drink .motion-dot {
  transform: translate(-18px, -28px);
}
.task-copy {
  padding-top: 22px;
}
.task-copy > span {
  color: var(--blue);
  font-size: 14px;
  font-weight: 650;
  letter-spacing: 0.07em;
  text-transform: uppercase;
}
.task-copy h3 {
  margin-top: 14px;
  font-family: var(--display);
  font-size: clamp(32px, 3.4vw, 43px);
  font-weight: 470;
  letter-spacing: -0.04em;
  line-height: 1.18;
}
.task-copy p {
  margin-top: 15px;
  color: var(--muted);
  font-size: 16px;
  line-height: 1.7;
}

.closing {
  max-width: var(--content);
  margin: 0 auto;
  padding: 160px 24px 170px;
  border-top: 1px solid var(--line-strong);
  text-align: center;
}
.closing > p {
  color: var(--blue);
  font-size: 15px;
  font-weight: 650;
  letter-spacing: 0.1em;
  text-transform: uppercase;
}
.closing h2 {
  max-width: 1040px;
  margin: 38px auto 0;
  font-family: var(--display);
  font-size: clamp(52px, 5.7vw, 78px);
  font-weight: 430;
  letter-spacing: -0.05em;
  line-height: 1.12;
}
.closing a {
  display: inline-flex;
  gap: 14px;
  align-items: center;
  margin-top: 64px;
  padding-bottom: 4px;
  border-bottom: 1px solid var(--ink);
  font-size: 15px;
  font-weight: 600;
}
.closing a i {
  color: var(--blue);
  font-style: normal;
}
.site-footer {
  display: grid;
  grid-template-columns: 210px 1fr auto;
  gap: 36px;
  align-items: center;
  min-height: 130px;
  padding: 24px max(34px, calc((100vw - var(--wide)) / 2));
  border-top: 1px solid var(--line);
  background: var(--paper);
  color: var(--muted);
  font-size: 14px;
}
.footer-brand {
  display: block;
  width: 180px;
  height: 58px;
  overflow: hidden;
}
.footer-brand img {
  width: 184px;
  height: 74px;
  object-fit: contain;
  transform: translateY(-8px);
}
.site-footer p:nth-child(2) {
  color: var(--ink-soft);
}

.js .reveal {
  opacity: 0;
  transform: translateY(22px);
  transition:
    opacity 620ms ease,
    transform 620ms cubic-bezier(0.2, 0.7, 0.2, 1);
}
.js .reveal.is-visible {
  opacity: 1;
  transform: none;
}

@media (max-width: 980px) {
  .site-header {
    grid-template-columns: 170px 1fr auto auto;
    padding-inline: 24px;
  }
  .site-nav {
    display: none;
  }
  .menu-button {
    display: block;
    padding: 7px 0;
    border: 0;
    background: none;
    font-size: 14px;
    cursor: pointer;
  }
  .mobile-menu {
    position: absolute;
    top: 74px;
    right: 22px;
    display: grid;
    width: 260px;
    padding: 12px 18px;
    border: 1px solid var(--line);
    border-radius: 14px;
    background: rgba(var(--paper-rgb), 0.98);
    box-shadow: 0 22px 50px rgba(24, 36, 45, 0.16);
    opacity: 0;
    pointer-events: none;
    transform: translateY(-8px);
    transition:
      opacity 160ms ease,
      transform 160ms ease;
  }
  .mobile-menu.is-open {
    opacity: 1;
    pointer-events: auto;
    transform: none;
  }
  .mobile-menu a {
    padding: 12px 4px;
    border-bottom: 1px solid var(--line);
    color: var(--ink-soft);
    font-size: 14px;
  }
  .mobile-menu a:last-child {
    border-bottom: 0;
  }
  .section-intro {
    grid-template-columns: 1fr;
    gap: 30px;
  }
  .section-intro p {
    max-width: 720px;
  }
  .distribution-layout {
    grid-template-columns: 1fr;
  }
  .field-figure {
    max-width: 720px;
  }
  .principle-grid,
  .engine-principles {
    grid-template-columns: 1fr;
  }
  .principle-grid article,
  .engine-principles article {
    min-height: 0;
    border-top: 1px solid var(--line);
    border-left: 0;
  }
  .principle-grid article:first-child,
  .engine-principles article:first-child {
    border-top: 0;
  }
  .principle-grid h3,
  .engine-principles h3 {
    margin-top: 28px;
  }
}

@media (max-width: 760px) {
  body {
    font-size: 17px;
  }
  .site-header {
    grid-template-columns: 1fr auto auto;
    min-height: 70px;
    padding: 8px 16px;
    gap: 15px;
  }
  .brand {
    width: 142px;
    height: 48px;
  }
  .brand img {
    width: 146px;
    height: 60px;
    transform: translateY(-6px);
  }
  .language-switch {
    gap: 4px;
    font-size: 12px;
  }
  .menu-button {
    font-size: 13px;
  }
  .mobile-menu {
    top: 67px;
    right: 14px;
    width: min(260px, calc(100vw - 28px));
  }
  .article-hero {
    padding: 82px 16px 104px;
  }
  .edition {
    margin-bottom: 26px;
    font-size: 11px;
  }
  .article-hero h1,
  html[data-lang="en"] .article-hero h1 {
    font-size: clamp(46px, 13.2vw, 58px);
    letter-spacing: -0.052em;
    line-height: 1.07;
  }
  html[data-lang="en"] .article-hero h1 {
    font-size: clamp(43px, 12.4vw, 54px);
  }
  .accent {
    white-space: normal;
  }
  .dek,
  html[data-lang="en"] .dek {
    margin-top: 30px;
    font-size: 17px;
    line-height: 1.78;
  }
  .article-meta {
    grid-template-columns: minmax(0, 1fr);
    margin-top: 45px;
  }
  .article-meta div {
    border-top: 1px solid var(--line);
    border-left: 0;
  }
  .article-meta div:first-child {
    border-top: 0;
  }
  .article-meta div {
    min-height: 88px;
    padding: 16px 14px;
  }
  .hero-media {
    margin-top: 54px;
  }
  .media-label {
    font-size: 11px;
  }
  .hero-media video {
    border-radius: 12px;
  }
  figcaption {
    grid-template-columns: 76px 1fr;
    gap: 10px;
    font-size: 11px;
  }
  .article-section {
    padding: 92px 16px;
  }
  .section-index {
    grid-template-columns: 44px 1fr;
    margin-bottom: 45px;
    font-size: 11px;
  }
  .section-index > span:first-child {
    font-size: 23px;
  }
  .section-intro h2,
  html[data-lang="en"] .section-intro h2 {
    font-size: clamp(40px, 11.5vw, 50px);
    line-height: 1.12;
  }
  .section-intro p {
    padding-top: 0;
    line-height: 1.75;
  }
  .thesis {
    margin: 70px 0;
    padding-left: 24px;
  }
  .thesis p {
    font-size: clamp(33px, 9.5vw, 43px);
  }
  .continuity-figure,
  .engine-figure,
  .scaling-figure,
  .model-figure {
    margin-top: 58px;
    overflow-x: hidden;
  }
  .continuity-figure svg,
  .engine-figure svg,
  .model-figure svg {
    width: 100%;
    max-width: 100%;
    height: auto;
    border-radius: 18px;
  }
  .continuity-figure figcaption,
  .engine-figure figcaption,
  .model-figure figcaption {
    min-width: 0;
  }
  .principle-grid,
  .engine-principles {
    margin-top: 56px;
  }
  .principle-grid article,
  .engine-principles article {
    padding: 30px 10px;
  }
  .principle-grid h3,
  .engine-principles h3 {
    font-size: 29px;
  }
  .distribution-layout {
    margin-top: 58px;
  }
  .field-copy h3 {
    font-size: 43px;
  }
  .field-copy > p:not(.overline) {
    margin-top: 22px;
  }
  .metric-strip {
    grid-template-columns: 1fr 1fr;
    margin-top: 58px;
  }
  .metric-strip article:nth-child(3) {
    border-left: 0;
    border-top: 1px solid var(--line);
  }
  .metric-strip article:nth-child(4) {
    border-top: 1px solid var(--line);
  }
  .metric-strip article {
    padding: 25px 16px;
  }
  .metric-strip strong {
    font-size: 36px;
  }
  .figure-header {
    padding: 14px 16px;
    font-size: 11px;
  }
  .scaling-figure svg {
    width: 100%;
    max-width: 100%;
    height: auto;
    padding: 8px 6px 0;
  }
  .scaling-figure {
    overflow-x: hidden;
  }
  .task-grid {
    grid-template-columns: 1fr;
    gap: 62px;
    margin-top: 60px;
  }
  .task-copy h3 {
    font-size: 36px;
  }
  .closing {
    padding: 112px 16px 120px;
  }
  .closing h2 {
    font-size: clamp(42px, 11.6vw, 54px);
  }
  .closing a {
    margin-top: 46px;
  }
  .site-footer {
    grid-template-columns: 1fr;
    gap: 14px;
    padding: 28px 18px 34px;
  }
  .footer-brand {
    width: 160px;
  }
}

/* Lab index integration: retain the official wordmark and add a distinct LAB layer. */
.brand {
  display: flex;
  gap: 12px;
  align-items: center;
  width: 232px;
}

html[data-lang="zh"] .brand {
  width: 220px;
}

.brand img {
  flex: 0 1 176px;
  min-width: 0;
}

html[data-lang="zh"] .brand img {
  flex-basis: 164px;
}

.brand-lab,
.footer-brand-lab {
  flex: none;
  padding-left: 11px;
  border-left: 1px solid var(--line-strong);
  color: var(--blue);
  font-family: "JetBrains Mono Variable", "SFMono-Regular", Consolas, monospace;
  font-size: 14px;
  font-variation-settings: "wght" 650;
  letter-spacing: 0.04em;
}

.footer-brand {
  display: flex;
  gap: 13px;
  align-items: center;
  width: 242px;
}

.footer-brand img {
  flex: 0 1 184px;
  min-width: 0;
}

html[data-lang="zh"] .footer-brand img {
  flex-basis: 172px;
}

@media (max-width: 1180px) {
  .site-header {
    grid-template-columns: 232px minmax(0, 1fr) auto auto;
  }

  .language-switch {
    grid-column: 3;
    justify-self: end;
  }

  .menu-button {
    grid-column: 4;
  }
}

@media (min-width: 1181px) {
  .language-switch {
    grid-column: 3;
    justify-self: end;
  }
}

@media (max-width: 760px) {
  .site-header {
    grid-template-columns: minmax(0, 1fr) auto auto;
  }

  .language-switch {
    grid-column: 2;
  }

  .menu-button {
    grid-column: 3;
  }

  .brand,
  html[data-lang="zh"] .brand {
    width: 168px;
  }

  .brand img,
  html[data-lang="zh"] .brand img {
    flex-basis: 126px;
  }

  .brand-lab {
    padding-left: 8px;
    font-size: 11px;
  }

}

@media (max-width: 340px) {
  .brand,
  html[data-lang="zh"] .brand {
    width: 138px;
  }

  .brand img,
  html[data-lang="zh"] .brand img {
    flex-basis: 102px;
  }

  .brand-lab {
    padding-left: 6px;
    font-size: 9px;
  }
}

/* Lab index parity: keep the article footer as quiet as the homepage footer. */
.site-footer {
  display: block;
  width: min(100%, 1440px);
  min-height: 0;
  margin: 0 auto;
  padding: 26px 24px 30px;
  border-top: 1px solid rgba(20, 38, 50, 0.16);
  background: transparent;
  color: #778791;
  font-family: ui-monospace, "SFMono-Regular", Consolas, monospace;
  font-size: 11px;
  line-height: normal;
  letter-spacing: 0.08em;
}

.site-footer p {
  margin: 0;
  color: inherit;
}

@media (max-width: 760px) {
  .site-footer {
    padding: 22px 16px 26px;
  }
}

@media (max-width: 340px) and (max-height: 620px) {
  .site-footer {
    padding: 18px 16px 22px;
  }
}

/* Header placement after the explicit Lab-home label was removed. */
@media (min-width: 1181px) {
  .language-switch {
    grid-column: 3;
    justify-self: end;
  }
}

@media (max-width: 1180px) {
  .site-header {
    grid-template-columns: 232px minmax(0, 1fr) auto auto;
  }

  .language-switch {
    grid-column: 3;
    justify-self: end;
  }

  .menu-button {
    grid-column: 4;
  }
}

@media (max-width: 760px) {
  .site-header {
    grid-template-columns: minmax(0, 1fr) auto auto;
  }

  .language-switch {
    grid-column: 2;
  }

  .menu-button {
    grid-column: 3;
  }
}

@media (prefers-reduced-motion: reduce) {
  html {
    scroll-behavior: auto;
  }
  *,
  *::before,
  *::after {
    animation-duration: 0.01ms !important;
    animation-iteration-count: 1 !important;
    transition-duration: 0.01ms !important;
  }
  .js .reveal {
    opacity: 1;
    transform: none;
  }
}

/* Motion-distribution layout. */
:root {
  --canvas: #fbfbfa;
  --canvas-rgb: 251, 251, 250;
  --paper: #ffffff;
  --paper-rgb: 255, 255, 255;
  --paper-blue: #f2f8fa;
  --paper-blue-rgb: 242, 248, 250;
  --ink: #142735;
  --ink-soft: #41545f;
  --muted: #6e7d84;
  --line: rgba(20, 39, 53, 0.14);
  --line-strong: rgba(20, 39, 53, 0.32);
  --blue: #007dce;
  --sky: #00bfe8;
  --green: #b9da19;
  --orange: #ef562c;
  --yellow: #f0ac30;
  --reading: 860px;
  --figure: 1420px;
  --gutter: clamp(22px, 4.4vw, 72px);
  --toc-rail: 184px;
  --toc-half: 92px;
}

body {
  background:
    linear-gradient(
      90deg,
      transparent 0,
      transparent calc(50% - 1px),
      rgba(20, 39, 53, 0.022) 50%,
      transparent calc(50% + 1px)
    ),
    var(--canvas);
}

body::before {
  background:
    radial-gradient(circle at 81% 8%, rgba(0, 191, 232, 0.1), transparent 22%),
    radial-gradient(circle at 7% 42%, rgba(0, 125, 206, 0.05), transparent 19%),
    radial-gradient(
      circle at 91% 72%,
      rgba(0, 191, 232, 0.028),
      transparent 18%
    );
}

.site-header {
  grid-template-columns: minmax(188px, 230px) 1fr auto;
  min-height: 88px;
  padding: 12px max(24px, calc((100vw - 1420px) / 2));
  background: rgba(var(--canvas-rgb), 0.94);
}

.site-header.is-scrolled {
  min-height: 72px;
}
.brand {
  width: 214px;
  height: 58px;
  overflow: visible;
}
html[data-lang="zh"] .brand {
  width: 184px;
}
.brand img {
  width: 100%;
  height: 100%;
  object-fit: contain;
  object-position: left center;
  transform: none;
}
.site-nav {
  position: fixed;
  top: calc(50% + 34px);
  left: max(24px, calc((100vw - 1720px) / 2));
  z-index: 40;
  display: grid;
  width: 138px;
  gap: 0;
  align-content: center;
  transform: translateY(-50%);
}
.toc-kicker {
  margin: 0 0 18px;
  color: var(--muted);
  font-size: 14px;
  font-weight: 650;
  letter-spacing: 0.08em;
  line-height: 1.35;
  text-transform: uppercase;
}
.site-nav a {
  position: relative;
  display: grid;
  grid-template-columns: 26px 1fr;
  gap: 9px;
  align-items: baseline;
  padding: 11px 0;
  border-top: 1px solid var(--line);
  color: var(--muted);
  font-size: 15px;
  font-weight: 570;
  line-height: 1.25;
}
.site-nav a:last-child {
  border-bottom: 1px solid var(--line);
}
.site-nav a::after {
  top: 9px;
  right: auto;
  bottom: 9px;
  left: -12px;
  width: 2px;
  height: auto;
  background: var(--blue);
  transform: scaleY(0);
  transform-origin: center;
}
.site-nav a:hover,
.site-nav a.is-active {
  color: var(--ink);
}
.site-nav a:hover::after,
.site-nav a.is-active::after {
  transform: scaleY(1);
}
.toc-number {
  color: var(--blue);
  font-size: 13px;
  font-weight: 700;
  letter-spacing: 0.04em;
}
.language-switch {
  justify-self: end;
  padding-left: 18px;
  border-left: 1px solid var(--line);
  font-size: 14px;
}

main,
.site-footer {
  margin-left: var(--toc-rail);
}

.article-hero {
  position: relative;
  isolation: isolate;
  max-width: none;
  padding: clamp(110px, 12vw, 174px) var(--gutter) 168px;
  overflow: hidden;
  text-align: left;
}

.article-hero::before,
.article-hero::after {
  position: absolute;
  z-index: -1;
  border: 1px solid rgba(0, 125, 206, 0.12);
  border-radius: 50%;
  content: "";
}

.article-hero::before {
  top: 44px;
  right: -130px;
  width: 520px;
  height: 520px;
}
.article-hero::after {
  top: 132px;
  right: -42px;
  width: 338px;
  height: 338px;
  box-shadow:
    0 0 0 56px rgba(0, 191, 232, 0.025),
    0 0 0 112px rgba(0, 125, 206, 0.014);
}

.edition,
.article-hero h1,
.article-meta {
  width: min(1260px, 100%);
  margin-right: auto;
  margin-left: auto;
}
.edition {
  justify-content: flex-start;
  margin-bottom: 46px;
  font-size: 15px;
}
.article-hero h1 {
  max-width: 1260px;
  font-size: clamp(72px, 7.6vw, 116px);
  line-height: 0.96;
}
html[data-lang="en"] .article-hero h1 {
  max-width: 1320px;
  font-size: clamp(68px, 6.95vw, 106px);
  line-height: 0.98;
}
.hero-thesis,
html[data-lang="en"] .hero-thesis {
  width: min(1260px, 100%);
  max-width: none;
  margin: 48px auto 0;
}
.dek {
  width: min(690px, 56%);
  max-width: none;
  margin: 38px calc((100% - min(1260px, 100%)) / 2) 0 auto;
  font-size: 21px;
}
html[data-lang="en"] .dek {
  width: min(730px, 58%);
  max-width: none;
  font-size: 22px;
}
.article-meta {
  max-width: 1260px;
  margin-top: 76px;
}
.article-meta div {
  min-height: 104px;
  padding: 23px 24px 19px;
}
.article-meta div > span {
  font-size: 14px;
}
.article-meta strong {
  font-size: 16px;
}
.media-label {
  font-size: 15px;
}
figcaption {
  grid-template-columns: 106px 1fr;
  gap: 18px;
  padding-top: 17px;
  font-size: 15px;
}

.hero-media {
  width: min(var(--figure), calc(100vw - var(--toc-rail) - 32px));
  margin: 104px 0 0
    max(calc(50% - 710px), calc(50% - 50vw + var(--toc-half) + 16px));
  transform: none;
}
.hero-media video {
  border-radius: 26px;
  box-shadow: 0 36px 90px rgba(20, 39, 53, 0.18);
}

.article-section {
  position: relative;
  max-width: none;
  margin: 0;
  padding: 168px var(--gutter);
  overflow: clip;
  border-top-color: var(--line-strong);
}
.article-section > * {
  position: relative;
  z-index: 1;
}
.article-section::after {
  position: absolute;
  top: 110px;
  right: -172px;
  width: 420px;
  height: 420px;
  border: 1px solid rgba(0, 125, 206, 0.08);
  border-radius: 50%;
  box-shadow:
    inset 0 0 0 68px rgba(0, 191, 232, 0.018),
    inset 0 0 0 138px rgba(0, 125, 206, 0.012);
  content: "";
}
.distribution-section::after {
  right: auto;
  left: -210px;
  width: 500px;
  height: 500px;
}
.model-section::after {
  top: auto;
  right: -90px;
  bottom: 120px;
}

.section-index,
.section-intro {
  width: min(var(--reading), 100%);
  margin-right: auto;
  margin-left: auto;
}
.section-index {
  display: flex;
  grid-template-columns: none;
  gap: 20px;
  margin-bottom: 76px;
  font-size: 15px;
}
.section-index::after {
  flex: 1;
  height: 1px;
  margin-left: 18px;
  background: var(--line);
  content: "";
}
.section-index > span:first-child {
  display: grid;
  place-items: center;
  width: 54px;
  height: 54px;
  border: 1px solid rgba(0, 125, 206, 0.3);
  border-radius: 50%;
  font-family: var(--body);
  font-size: 15px;
  letter-spacing: 0;
}
.section-intro {
  display: grid;
  grid-template-columns: 1fr;
  gap: 42px;
}
.section-intro h2 {
  max-width: 820px;
  font-size: clamp(58px, 6vw, 84px);
  line-height: 1.02;
}
html[data-lang="en"] .section-intro h2 {
  font-size: clamp(56px, 5.5vw, 78px);
}
.section-intro p {
  max-width: 560px;
  margin-left: auto;
  padding-top: 0;
  font-size: 19px;
  line-height: 1.86;
}
.editorial-copy {
  display: grid;
  width: min(720px, 100%);
  margin: 76px auto 0;
  gap: 28px;
}
.editorial-copy p {
  color: var(--ink-soft);
  font-size: 18px;
  line-height: 1.9;
}
.editorial-copy p + p {
  padding-top: 26px;
  border-top: 1px solid var(--line);
}

.thesis {
  width: min(940px, 100%);
  max-width: none;
  margin: 124px auto;
  padding: 58px 66px 62px;
  overflow: hidden;
  border: 1px solid rgba(0, 125, 206, 0.18);
  border-left: 1px solid rgba(0, 125, 206, 0.18);
  border-radius: 30px;
  background: linear-gradient(
    112deg,
    rgba(0, 191, 232, 0.1),
    rgba(var(--paper-rgb), 0.9) 54%,
    rgba(0, 125, 206, 0.05)
  );
}
.thesis::before {
  position: absolute;
  top: -58px;
  right: 26px;
  color: rgba(0, 125, 206, 0.1);
  font-family: var(--display);
  font-size: 240px;
  line-height: 1;
  content: "“";
}
.thesis p {
  position: relative;
  font-size: clamp(44px, 4.4vw, 64px);
}

.continuity-figure,
.engine-figure,
.model-figure,
.scaling-figure {
  position: relative;
  width: min(var(--figure), calc(100vw - var(--toc-rail) - 32px));
  margin: 104px 0 0
    max(calc(50% - 710px), calc(50% - 50vw + var(--toc-half) + 16px));
  transform: none;
}
.continuity-figure::before,
.engine-figure::before,
.model-figure::before,
.scaling-figure::before {
  position: absolute;
  top: 22px;
  left: 24px;
  z-index: 3;
  padding: 7px 12px;
  border: 1px solid rgba(0, 125, 206, 0.24);
  border-radius: 999px;
  background: rgba(var(--paper-rgb), 0.9);
  color: var(--blue);
  font-size: 12px;
  font-weight: 700;
  letter-spacing: 0.12em;
  backdrop-filter: blur(8px);
}
html[data-lang="en"] .continuity-figure::before {
  content: "MOTION DISTRIBUTION";
}
html[data-lang="zh"] .continuity-figure::before {
  content: "动作分布";
}
html[data-lang="en"] .engine-figure::before {
  content: "DECISION LOOP";
}
html[data-lang="zh"] .engine-figure::before {
  content: "判断闭环";
}
html[data-lang="en"] .scaling-figure::before {
  content: "EVIDENCE";
}
html[data-lang="zh"] .scaling-figure::before {
  content: "训练证据";
}
html[data-lang="en"] .model-figure::before {
  content: "WORLD × ACTION";
}
html[data-lang="zh"] .model-figure::before {
  content: "世界 × 动作";
}
.continuity-figure svg,
.engine-figure svg,
.model-figure svg {
  border: 1px solid var(--line);
  border-radius: 34px;
  box-shadow: 0 28px 76px rgba(20, 39, 53, 0.1);
}
.continuity-figure > figcaption,
.engine-figure > figcaption,
.model-figure > figcaption,
.scaling-figure > figcaption {
  width: min(var(--reading), calc(100% - 32px));
  margin-right: auto;
  margin-left: auto;
}

/* Figure 01 dexterity bottleneck. */
.compare-tag {
  fill: var(--muted);
  font: 700 12px var(--body);
  letter-spacing: 0.12em;
  text-anchor: end;
}
.flow-lane > rect {
  stroke-width: 1;
}
.common-flow > rect {
  fill: rgba(240, 172, 48, 0.065);
  stroke: rgba(239, 86, 44, 0.18);
}
.noe-flow > rect {
  fill: rgba(0, 191, 232, 0.045);
  stroke: rgba(0, 125, 206, 0.2);
}
.lane-eyebrow {
  fill: var(--orange);
  font: 700 12px var(--body);
  letter-spacing: 0.11em;
}
.noe-flow .lane-eyebrow {
  fill: var(--blue);
}
.lane-title {
  fill: var(--ink);
  font: 600 18px var(--body);
}
.knowledge-field > circle:first-child {
  fill: rgba(240, 172, 48, 0.14);
  stroke: rgba(239, 86, 44, 0.4);
  stroke-width: 2;
}
.knowledge-field > circle:not(:first-child) {
  fill: var(--paper);
  stroke: var(--orange);
  stroke-width: 3;
}
.knowledge-field path {
  fill: none;
  stroke: var(--orange);
  stroke-width: 4;
  stroke-linecap: round;
}
.field-noe > circle:first-child {
  fill: rgba(185, 218, 25, 0.15);
  stroke: rgba(0, 125, 206, 0.38);
}
.field-noe > circle:not(:first-child) {
  stroke: var(--blue);
}
.field-noe path {
  stroke: var(--blue);
}
.funnel-shape {
  fill: url(#funnel-fill);
}
.flow-threads path {
  fill: none;
  stroke: rgba(255, 255, 255, 0.68);
  stroke-width: 2;
}
.loss-particles circle {
  fill: var(--orange);
  opacity: 0.75;
}
.loss-particles path {
  fill: none;
  stroke: rgba(239, 86, 44, 0.44);
  stroke-width: 1.5;
  stroke-dasharray: 4 6;
}
.bottleneck-mark path {
  fill: rgba(252, 251, 247, 0.86);
  stroke: var(--orange);
  stroke-width: 2;
}
.bottleneck-mark text {
  fill: var(--orange);
  font: 650 13px var(--body);
  text-anchor: middle;
}
.stage-pin circle {
  fill: rgba(252, 251, 247, 0.92);
  stroke: rgba(20, 39, 53, 0.38);
  stroke-width: 2;
}
.stage-pin > text:nth-of-type(1) {
  fill: var(--ink);
  font: 700 13px var(--body);
  text-anchor: middle;
}
.stage-pin > text:not(:nth-of-type(1)) {
  fill: var(--muted);
  font: 600 12px var(--body);
  text-anchor: middle;
}
.capability-node > circle:first-child {
  fill: rgba(239, 86, 44, 0.08);
  stroke: rgba(239, 86, 44, 0.28);
  stroke-width: 2;
}
.capability-node > circle:nth-child(2) {
  fill: var(--paper);
  stroke: var(--orange);
  stroke-width: 2;
}
.capability-node path {
  fill: none;
  stroke: var(--orange);
  stroke-width: 4;
  stroke-linecap: round;
}
.capability-node text {
  fill: var(--muted);
  font: 600 12px var(--body);
  text-anchor: middle;
}
.open-flow-shape {
  fill: url(#open-flow);
}
.open-threads path {
  fill: none;
  stroke: rgba(255, 255, 255, 0.72);
  stroke-width: 2;
}
.pin-pre-noe circle,
.pin-post-noe circle {
  stroke: var(--blue);
}
.continuity-seal circle {
  fill: rgba(252, 251, 247, 0.88);
  stroke: var(--green);
  stroke-width: 2;
}
.continuity-seal path {
  fill: none;
  stroke: var(--blue);
  stroke-width: 3.5;
  stroke-linecap: round;
}
.continuity-seal text {
  fill: var(--blue);
  font: 650 12px var(--body);
  text-anchor: middle;
}
.capability-noe > circle:first-child {
  fill: rgba(0, 191, 232, 0.12);
  stroke: rgba(0, 125, 206, 0.34);
}
.capability-noe > circle:nth-child(2) {
  stroke: var(--blue);
}
.capability-noe path {
  stroke: var(--blue);
}
.capability-noe text {
  fill: var(--blue);
}

.principle-grid,
.engine-principles {
  width: min(1080px, 100%);
  margin-right: auto;
  margin-left: auto;
}
.principle-grid {
  margin-top: 96px;
}
.principle-grid article {
  min-height: 292px;
  padding: 42px 38px;
}

.distribution-section {
  background: linear-gradient(
    180deg,
    rgba(var(--paper-blue-rgb), 0.5),
    rgba(var(--canvas-rgb), 0) 44%
  );
}
.distribution-layout {
  width: min(1360px, 100%);
  margin: 108px auto 0;
  grid-template-columns: 1.18fr 0.82fr;
}
.field-figure svg {
  border: 1px solid var(--line);
  border-radius: 34px;
  box-shadow: 0 26px 70px rgba(20, 39, 53, 0.09);
}
.field-copy {
  max-width: 510px;
}
.metric-strip {
  width: min(1300px, 100%);
  margin: 92px auto 0;
}
.metric-strip article {
  padding: 36px 30px 34px;
}

.task-landscape {
  position: relative;
  width: min(1460px, calc(100vw - var(--toc-rail) - 28px));
  margin: 142px 0 12px
    max(calc(50% - 730px), calc(50% - 50vw + var(--toc-half) + 14px));
  padding: clamp(62px, 6vw, 96px) clamp(22px, 5vw, 78px) clamp(70px, 7vw, 110px);
  overflow: hidden;
  border: 1px solid rgba(0, 125, 206, 0.18);
  border-radius: 44px;
  background:
    radial-gradient(circle at 92% 6%, rgba(0, 191, 232, 0.14), transparent 24%),
    radial-gradient(
      circle at 5% 92%,
      rgba(0, 125, 206, 0.075),
      transparent 25%
    ),
    linear-gradient(145deg, var(--paper-blue), var(--paper) 48%, var(--canvas));
  box-shadow: 0 34px 96px rgba(20, 39, 53, 0.1);
  transform: none;
}
.task-landscape::before {
  position: absolute;
  top: -72px;
  right: 20px;
  color: rgba(0, 125, 206, 0.055);
  font-family: var(--display);
  font-size: clamp(170px, 21vw, 300px);
  font-weight: 500;
  line-height: 1;
}
html[data-lang="en"] .task-landscape::before {
  content: "SAMPLES";
}
html[data-lang="zh"] .task-landscape::before {
  content: "样例";
}
@media (min-width: 761px) and (max-width: 1440px) {
  .task-landscape::before {
    top: -48px;
    font-size: clamp(150px, 15.5vw, 220px);
  }
}
.task-landscape-head {
  position: relative;
  display: grid;
  grid-template-columns: 0.58fr 1.42fr;
  gap: clamp(36px, 7vw, 110px);
  max-width: 1240px;
  margin: 0 auto;
}
.task-landscape-head > p {
  padding-top: 14px;
  color: var(--blue);
  font-size: 14px;
  font-weight: 700;
  letter-spacing: 0.1em;
}
.task-landscape-head h2 {
  max-width: 820px;
  font-family: var(--display);
  font-size: clamp(54px, 5.6vw, 80px);
  font-weight: 430;
  letter-spacing: -0.048em;
  line-height: 1.04;
}
.task-landscape-head div > p {
  max-width: 620px;
  margin: 34px 0 0 auto;
  color: var(--ink-soft);
  font-size: 18px;
  line-height: 1.82;
}
.task-grid {
  grid-template-columns: repeat(12, minmax(0, 1fr));
  gap: 88px 30px;
  margin-top: 94px;
}
.task-card:nth-child(1) {
  grid-column: span 7;
}
.task-card:nth-child(2) {
  grid-column: span 5;
}
.task-card:nth-child(3) {
  grid-column: span 4;
}
.task-card:nth-child(4) {
  grid-column: span 8;
}
.task-card:nth-child(5),
.task-card:nth-child(6) {
  grid-column: span 6;
}
.task-screen {
  border-radius: 24px;
  box-shadow: 0 18px 48px rgba(20, 39, 53, 0.08);
}
.task-card:nth-child(1) .task-screen,
.task-card:nth-child(4) .task-screen {
  aspect-ratio: 1.7 / 1;
}
.task-copy h3 {
  font-size: clamp(34px, 3vw, 48px);
}
.task-copy p {
  max-width: 590px;
}

.engine-principles {
  margin-top: 86px;
}
.scaling-section {
  background: rgba(var(--paper-rgb), 0.55);
}
.scaling-figure {
  width: min(1280px, calc(100vw - var(--toc-rail) - 32px));
  margin-left: max(
    calc(50% - 640px),
    calc(50% - 50vw + var(--toc-half) + 16px)
  );
  border-radius: 34px;
}
.model-section {
  background: linear-gradient(
    180deg,
    rgba(0, 125, 206, 0.025),
    rgba(0, 191, 232, 0.035)
  );
}

.citation-section {
  background: linear-gradient(
    135deg,
    var(--paper-blue),
    var(--paper) 64%,
    var(--canvas)
  );
}
.citation-layout {
  display: grid;
  grid-template-columns: 0.72fr 1.28fr;
  gap: clamp(64px, 8vw, 120px);
  align-items: end;
  width: min(1180px, 100%);
  margin: 0 auto;
}
.citation-lead > p:first-child {
  color: var(--blue);
  font-size: 14px;
  font-weight: 700;
  letter-spacing: 0.1em;
  text-transform: uppercase;
}
.citation-lead h2 {
  margin-top: 34px;
  font-family: var(--display);
  font-size: clamp(50px, 5vw, 72px);
  font-weight: 440;
  letter-spacing: -0.045em;
  line-height: 1;
}
.citation-lead > p:last-child {
  max-width: 520px;
  margin-top: 32px;
  color: var(--ink-soft);
  font-size: 18px;
  line-height: 1.82;
}
.bibtex-card {
  position: relative;
  margin: 0;
  padding: 34px 38px;
  overflow-x: auto;
  border: 1px solid rgba(0, 125, 206, 0.22);
  border-radius: 24px;
  background:
    linear-gradient(rgba(0, 125, 206, 0.05) 1px, transparent 1px),
    linear-gradient(90deg, rgba(0, 125, 206, 0.05) 1px, transparent 1px),
    rgba(var(--paper-rgb), 0.94);
  background-size: 24px 24px;
  box-shadow: 0 20px 56px rgba(20, 39, 53, 0.08);
  color: var(--ink);
  font:
    500 15px/1.72 "SFMono-Regular",
    Consolas,
    "Liberation Mono",
    monospace;
  overflow-wrap: anywhere;
  tab-size: 2;
  white-space: pre-wrap;
}
.bibtex-card::before {
  position: absolute;
  top: 14px;
  right: 17px;
  color: var(--blue);
  font: 700 12px/1 var(--body);
  letter-spacing: 0.12em;
  content: "BIBTEX";
}
.bibtex-card:focus-visible {
  outline: 2px solid var(--blue);
  outline-offset: 5px;
}

.closing {
  max-width: none;
  padding: 178px var(--gutter) 190px;
}
.closing h2 {
  max-width: 1180px;
  font-size: clamp(58px, 6.5vw, 92px);
}
.site-footer {
  grid-template-columns: 230px 1fr auto;
  min-height: 148px;
  padding: 28px max(24px, calc((100vw - var(--toc-rail) - 1420px) / 2));
  font-size: 14px;
}
.footer-brand {
  width: 218px;
  height: 66px;
  overflow: visible;
}
html[data-lang="zh"] .footer-brand {
  width: 188px;
}
.footer-brand img {
  width: 100%;
  height: 100%;
  object-fit: contain;
  object-position: left center;
  transform: none;
}

@media (max-width: 1180px) {
  :root {
    --toc-rail: 0px;
    --toc-half: 0px;
  }
  main,
  .site-footer {
    margin-left: 0;
  }
  .site-header {
    grid-template-columns: 210px 1fr auto;
  }
  .site-nav {
    display: none;
  }
  .menu-button {
    display: block;
    padding: 7px 0;
    border: 0;
    background: none;
    font-size: 15px;
    cursor: pointer;
  }
  .mobile-menu {
    position: absolute;
    top: 80px;
    right: 22px;
    display: grid;
    width: 280px;
    max-height: calc(100vh - 96px);
    max-height: calc(100dvh - 96px);
    padding: 13px 19px;
    overflow-y: auto;
    border: 1px solid var(--line);
    border-radius: 16px;
    background: rgba(var(--paper-rgb), 0.98);
    box-shadow: 0 22px 50px rgba(24, 36, 45, 0.14);
    opacity: 0;
    overscroll-behavior: contain;
    pointer-events: none;
    scrollbar-gutter: stable;
    touch-action: pan-y;
    transform: translateY(-8px);
    visibility: hidden;
    -webkit-overflow-scrolling: touch;
    transition:
      opacity 160ms ease,
      transform 160ms ease;
  }
  .mobile-menu.is-open {
    opacity: 1;
    pointer-events: auto;
    transform: none;
    visibility: visible;
  }
  .mobile-menu a {
    padding: 13px 4px;
    border-bottom: 1px solid var(--line);
    color: var(--ink-soft);
    font-size: 15px;
  }
  .mobile-menu a:last-child {
    border-bottom: 0;
  }
}

@media (max-width: 980px) {
  .site-header {
    grid-template-columns: 210px 1fr auto;
  }
  .article-hero h1,
  html[data-lang="en"] .article-hero h1 {
    font-size: clamp(64px, 9.2vw, 88px);
  }
  .hero-thesis,
  html[data-lang="en"] .hero-thesis {
    width: 100%;
    font-size: clamp(34px, 5.2vw, 46px);
  }
  .dek,
  html[data-lang="en"] .dek {
    width: min(700px, 70%);
  }
  .article-section {
    padding-top: 132px;
    padding-bottom: 132px;
  }
  .section-intro h2,
  html[data-lang="en"] .section-intro h2 {
    font-size: clamp(54px, 7.3vw, 70px);
  }
  .task-landscape-head {
    grid-template-columns: 1fr;
    gap: 24px;
  }
  .task-landscape-head div > p {
    margin-left: 0;
  }
  .task-card:nth-child(n) {
    grid-column: span 6;
  }
  .citation-layout {
    grid-template-columns: 1fr;
    gap: 70px;
  }
}

@media (max-width: 760px) {
  .site-header {
    grid-template-columns: 1fr auto auto;
    padding: 8px 16px;
  }
  .brand,
  html[data-lang="zh"] .brand {
    width: 148px;
    height: 48px;
  }
  .article-hero {
    padding: 92px 16px 112px;
  }
  .article-hero::before {
    top: 62px;
    right: -198px;
  }
  .article-hero::after {
    top: 145px;
    right: -120px;
  }
  .language-switch {
    font-size: 14px;
  }
  .menu-button {
    font-size: 14px;
  }
  .mobile-menu {
    top: 67px;
    right: 14px;
    width: min(280px, calc(100vw - 28px));
    max-height: calc(100vh - 82px);
    max-height: calc(100dvh - 82px);
  }
  .mobile-menu a {
    font-size: 14px;
  }
  .edition {
    margin-bottom: 30px;
    font-size: 14px;
  }
  .article-hero h1,
  html[data-lang="en"] .article-hero h1 {
    font-size: clamp(47px, 13.2vw, 60px);
    line-height: 1.03;
  }
  .article-hero h1 .title-prefix,
  .article-hero h1 .accent {
    display: block;
  }
  .hero-thesis,
  html[data-lang="en"] .hero-thesis {
    width: 100%;
    margin: 32px 0 0;
    font-size: clamp(28px, 8.4vw, 36px);
    line-height: 1.12;
  }
  .dek,
  html[data-lang="en"] .dek {
    width: 100%;
    margin: 28px 0 0;
    font-size: 18px;
  }
  .article-meta {
    margin-top: 54px;
  }
  .article-meta div > span {
    font-size: 13px;
  }
  .article-meta strong {
    font-size: 15px;
  }
  .hero-media {
    width: calc(100vw - 20px);
    margin: 66px 0 0 calc(50% - 50vw + 10px);
  }
  .media-label {
    font-size: 14px;
  }
  .hero-media video {
    border-radius: 16px;
  }
  .article-section {
    padding: 100px 16px;
    overflow: hidden;
  }
  .article-section::after {
    opacity: 0.6;
  }
  .section-index {
    margin-bottom: 54px;
    font-size: 14px;
  }
  .section-index > span:first-child {
    width: 46px;
    height: 46px;
    font-size: 13px;
  }
  .section-intro {
    gap: 30px;
  }
  .section-intro h2,
  html[data-lang="en"] .section-intro h2 {
    font-size: clamp(42px, 11.5vw, 52px);
    line-height: 1.08;
  }
  .section-intro p {
    margin-left: 0;
    font-size: 17px;
    line-height: 1.78;
  }
  .editorial-copy {
    margin-top: 48px;
    gap: 22px;
  }
  .editorial-copy p {
    font-size: 16.5px;
    line-height: 1.82;
  }
  .editorial-copy p + p {
    padding-top: 20px;
  }
  .thesis {
    margin: 72px auto;
    padding: 38px 26px 42px;
    border-radius: 22px;
  }
  .thesis::before {
    right: 8px;
    font-size: 150px;
  }
  .thesis p {
    font-size: clamp(34px, 9.6vw, 44px);
  }
  .continuity-figure,
  .engine-figure,
  .model-figure,
  .scaling-figure {
    width: calc(100vw - 20px);
    margin: 68px 0 0 calc(50% - 50vw + 10px);
    overflow-x: auto;
    border-radius: 20px;
  }
  .continuity-figure svg {
    width: 940px;
    max-width: none;
  }
  .engine-figure svg,
  .model-figure svg {
    width: 840px;
    max-width: none;
  }
  .continuity-figure::before,
  .engine-figure::before,
  .model-figure::before,
  .scaling-figure::before {
    top: 12px;
    left: 12px;
    font-size: 12px;
  }
  .continuity-figure::after {
    position: absolute;
    top: 13px;
    right: 12px;
    z-index: 3;
    padding: 7px 10px;
    border-radius: 999px;
    background: rgba(20, 39, 53, 0.78);
    color: #fff;
    font-size: 12px;
    font-weight: 700;
    letter-spacing: 0.09em;
  }
  html[data-lang="en"] .continuity-figure::after {
    content: "SWIPE →";
  }
  html[data-lang="zh"] .continuity-figure::after {
    content: "左右滑动 →";
  }
  .continuity-figure > figcaption,
  .engine-figure > figcaption,
  .model-figure > figcaption,
  .scaling-figure > figcaption {
    width: calc(100vw - 48px);
    margin-left: 14px;
  }
  figcaption {
    grid-template-columns: 94px 1fr;
    gap: 12px;
    font-size: 14px;
  }
  .figure-header {
    font-size: 14px;
  }
  .principle-grid article {
    min-height: 0;
    padding: 32px 10px;
  }
  .distribution-layout {
    margin-top: 68px;
  }
  .field-copy {
    max-width: none;
  }
  .metric-strip {
    margin-top: 62px;
  }
  .task-landscape {
    width: calc(100vw - 18px);
    margin: 92px 0 12px calc(50% - 50vw + 9px);
    padding: 66px 16px 78px;
    border-radius: 26px;
  }
  .task-landscape::before {
    top: -30px;
    right: 4px;
    font-size: 120px;
  }
  .task-landscape-head h2 {
    font-size: clamp(44px, 12vw, 54px);
  }
  .task-landscape-head div > p {
    font-size: 17px;
  }
  .task-grid {
    grid-template-columns: 1fr;
    gap: 66px;
    margin-top: 70px;
  }
  .task-card:nth-child(n) {
    grid-column: auto;
  }
  .task-card:nth-child(1) .task-screen,
  .task-card:nth-child(4) .task-screen {
    aspect-ratio: 16 / 9;
  }
  .task-screen {
    border-radius: 16px;
  }
  .citation-layout {
    gap: 56px;
  }
  .citation-lead h2 {
    font-size: 50px;
  }
  .citation-lead > p:last-child {
    font-size: 17px;
  }
  .bibtex-card {
    padding: 36px 24px 28px;
    border-radius: 18px;
    font-size: 13px;
  }
  .closing {
    padding: 120px 16px 132px;
  }
  .closing h2 {
    font-size: clamp(44px, 12vw, 58px);
  }
  .site-footer {
    grid-template-columns: 1fr;
  }
  .footer-brand,
  html[data-lang="zh"] .footer-brand {
    width: 170px;
    height: 56px;
  }
}

/* Responsive layout constraints. */
.principle-grid,
.engine-principles {
  grid-template-columns: repeat(3, minmax(0, 1fr));
}
.metric-strip {
  grid-template-columns: repeat(4, minmax(0, 1fr));
}
.continuity-figure::before,
.engine-figure::before,
.model-figure::before,
.scaling-figure::before {
  top: -46px;
  left: 0;
}
.scaling-figure {
  overflow: visible;
}

@media (max-width: 980px) {
  .distribution-layout {
    grid-template-columns: minmax(0, 1fr);
    gap: 54px;
    align-items: start;
  }
  .field-figure,
  .field-copy {
    min-width: 0;
    max-width: 720px;
  }
  .field-copy {
    justify-self: start;
  }
  .principle-grid,
  .engine-principles {
    grid-template-columns: minmax(0, 1fr);
  }
  .metric-strip {
    grid-template-columns: repeat(2, minmax(0, 1fr));
  }
  .metric-strip article:nth-child(3) {
    border-top: 1px solid var(--line);
    border-left: 0;
  }
  .metric-strip article:nth-child(4) {
    border-top: 1px solid var(--line);
  }
}

@media (min-width: 761px) and (max-height: 1050px) {
  .site-header {
    min-height: 76px;
  }
  .site-header.is-scrolled {
    min-height: 68px;
  }
  .brand {
    width: 190px;
    height: 50px;
  }
  html[data-lang="zh"] .brand {
    width: 170px;
  }

  .article-hero {
    padding-top: clamp(54px, 8svh, 78px);
    padding-bottom: clamp(96px, 14svh, 136px);
  }
  .edition {
    margin-bottom: clamp(24px, 3.6svh, 34px);
  }
  .article-hero h1 {
    font-size: clamp(64px, 6.3vw, 92px);
  }
  html[data-lang="en"] .article-hero h1 {
    font-size: clamp(60px, 6vw, 88px);
  }
  .hero-thesis,
  html[data-lang="en"] .hero-thesis {
    margin-top: clamp(26px, 3.8svh, 38px);
    font-size: clamp(32px, 3.6vw, 46px);
  }
  .dek,
  html[data-lang="en"] .dek {
    width: min(720px, 62%);
    margin-top: clamp(28px, 4svh, 38px);
    font-size: 20px;
    line-height: 1.66;
  }
  .article-meta {
    margin-top: clamp(48px, 7svh, 64px);
  }
  .article-section {
    padding-top: clamp(104px, 14svh, 142px);
    padding-bottom: clamp(104px, 14svh, 142px);
  }

  .hero-media,
  .continuity-figure,
  .engine-figure,
  .model-figure,
  .scaling-figure {
    margin-right: auto;
    margin-left: auto;
  }
  .hero-media {
    width: min(var(--figure), 100%, calc(177.7778svh - 462.2222px));
    margin-top: clamp(62px, 10svh, 90px);
  }
  .continuity-figure {
    width: min(var(--figure), 100%, calc(157.8947svh - 315.7895px));
  }
  .engine-figure,
  .model-figure {
    width: min(var(--figure), 100%);
  }
  .scaling-figure {
    width: min(1280px, 100%, calc(180.6452svh - 496.7742px));
  }
  .continuity-figure,
  .engine-figure,
  .model-figure,
  .scaling-figure {
    margin-top: clamp(62px, 10svh, 88px);
  }

  .closing {
    min-height: calc(100svh - 68px);
    padding-top: clamp(68px, 10svh, 96px);
    padding-bottom: clamp(72px, 11svh, 104px);
  }
  .closing h2 {
    font-size: clamp(52px, 5.5vw, 76px);
  }
}

@media (max-width: 760px) {
  .site-header {
    min-height: 72px;
    gap: 12px;
  }
  .site-header.is-scrolled {
    min-height: 64px;
  }
  .brand,
  html[data-lang="zh"] .brand {
    width: 142px;
    height: 46px;
  }
  .article-hero {
    padding-top: clamp(64px, 9svh, 84px);
  }
  .accent {
    white-space: normal;
  }
  .article-meta {
    grid-template-columns: minmax(0, 1fr);
  }
  .distribution-layout {
    gap: 44px;
  }
  .field-figure,
  .field-copy {
    width: 100%;
    max-width: none;
  }
  .metric-strip {
    grid-template-columns: repeat(2, minmax(0, 1fr));
  }
  .metric-strip article {
    min-width: 0;
    padding: 25px 16px;
  }
  .metric-strip strong {
    font-size: clamp(32px, 9.5vw, 36px);
  }
  .continuity-figure svg {
    width: min(940px, calc(157.8947svh - 512px));
  }
  .engine-figure svg {
    width: min(840px, calc(184.6154svh - 428.3077px));
  }
  .scaling-figure svg {
    width: min(760px, calc(180.6452svh - 639.4839px));
  }
  .model-figure svg {
    width: min(840px, calc(176.4706svh - 458.8236px));
  }
  .continuity-figure,
  .engine-figure,
  .model-figure,
  .scaling-figure {
    padding-top: 48px;
    overflow-x: auto;
    background: rgba(var(--paper-rgb), 0.72);
  }
  .continuity-figure::before,
  .engine-figure::before,
  .model-figure::before,
  .scaling-figure::before {
    top: 12px;
    left: 12px;
  }

  .closing {
    min-height: calc(100svh - 64px);
  }
}

@media (max-width: 760px) and (max-height: 720px) {
  .site-header {
    min-height: 68px;
  }
  .brand,
  html[data-lang="zh"] .brand {
    width: 134px;
    height: 42px;
  }
  .article-hero {
    padding-top: 54px;
    padding-bottom: 84px;
  }
  .edition {
    margin-bottom: 20px;
    font-size: 13px;
  }
  .article-hero h1 {
    font-size: clamp(42px, 11.5vw, 48px);
  }
  html[data-lang="en"] .article-hero h1 {
    font-size: clamp(40px, 11vw, 46px);
  }
  .hero-thesis,
  html[data-lang="en"] .hero-thesis {
    margin-top: 22px;
    font-size: clamp(25px, 7.4vw, 31px);
  }
  .dek,
  html[data-lang="en"] .dek {
    margin-top: 24px;
    font-size: 16.5px;
    line-height: 1.68;
  }
  .article-meta {
    margin-top: 42px;
  }
  .closing {
    min-height: calc(100svh - 60px);
    padding: 68px 16px 76px;
  }
  .closing h2 {
    font-size: clamp(40px, 11vw, 50px);
  }
  .closing a {
    margin-top: 34px;
  }
}

@media (max-width: 340px) and (max-height: 620px) {
  .site-header {
    min-height: 60px;
    padding: 6px 10px;
    gap: 8px;
  }
  .site-header.is-scrolled {
    min-height: 56px;
  }
  .brand,
  html[data-lang="zh"] .brand {
    width: 116px;
    height: 38px;
  }
  .language-switch {
    font-size: 12px;
  }
  .menu-button {
    font-size: 12px;
  }
  .article-hero {
    padding-top: 42px;
    padding-bottom: 72px;
  }
  .edition {
    margin-bottom: 14px;
    font-size: 11px;
  }
  .article-hero h1 {
    font-size: 38px;
    line-height: 1.02;
  }
  html[data-lang="en"] .article-hero h1 {
    font-size: 35px;
  }
  .hero-thesis,
  html[data-lang="en"] .hero-thesis {
    margin-top: 16px;
    font-size: 23px;
    line-height: 1.08;
  }
  .dek,
  html[data-lang="en"] .dek {
    margin-top: 18px;
    font-size: 15.5px;
    line-height: 1.56;
  }
  .article-meta {
    margin-top: 34px;
  }
  .hero-media figcaption,
  .continuity-figure > figcaption,
  .engine-figure > figcaption,
  .scaling-figure > figcaption,
  .model-figure > figcaption {
    grid-template-columns: minmax(0, 1fr);
    gap: 5px;
    width: calc(100vw - 40px);
    margin-left: 10px;
    font-size: 13px;
    line-height: 1.48;
  }
  .scaling-figure svg {
    width: min(760px, calc(180.6452svh - 704.5161px));
  }
  .metric-strip article {
    padding-right: 10px;
    padding-left: 10px;
  }
  .metric-strip strong {
    font-size: 30px;
  }
  .article-meta div > span {
    font-size: 12px;
    letter-spacing: 0.03em;
  }
  .article-meta strong {
    font-size: 14px;
    overflow-wrap: anywhere;
  }
}

/* Task media and in-view data flow. */
.section-index > span:first-child {
  flex: 0 0 auto;
  width: 58px;
  height: 58px;
  font-size: 13px;
}

.task-toolbar {
  position: relative;
  display: flex;
  align-items: center;
  justify-content: space-between;
  gap: 24px;
  max-width: 1240px;
  margin: 58px auto 0;
  padding-top: 24px;
  border-top: 1px solid rgba(0, 125, 206, 0.18);
}
.task-toolbar-controls {
  display: flex;
  flex-wrap: wrap;
  gap: 10px;
}
.task-toolbar button {
  min-height: 46px;
  padding: 0 18px;
  border: 1px solid rgba(0, 125, 206, 0.3);
  border-radius: 999px;
  background: rgba(var(--paper-rgb), 0.82);
  color: var(--blue);
  font: 680 14px/1 var(--body);
  letter-spacing: 0.02em;
  cursor: pointer;
  transition:
    color 160ms ease,
    background-color 160ms ease,
    border-color 160ms ease,
    transform 160ms ease;
}
.task-toolbar button:hover {
  transform: translateY(-2px);
  border-color: var(--blue);
}
.task-toolbar button:focus-visible,
.task-toggle:focus-visible {
  outline: 2px solid var(--blue);
  outline-offset: 4px;
}
.task-toolbar .task-shuffle {
  border-color: var(--blue);
  background: var(--blue);
  color: #fff;
}
.task-toolbar [data-task-status] {
  color: var(--muted);
  font: 600 14px/1.4 var(--body);
  text-align: right;
}

.task-grid {
  transition:
    opacity 180ms ease,
    transform 180ms ease;
}
.task-grid.is-refreshed {
  opacity: 0.36;
  transform: translateY(8px);
}
.task-video-screen {
  isolation: isolate;
  background: #11191f;
  cursor: default;
}
.task-video-screen:hover {
  transform: translateY(-3px);
  box-shadow: 0 22px 45px rgba(24, 36, 45, 0.14);
}
.task-video {
  display: block;
  width: 100%;
  height: 100%;
  object-fit: contain;
  background: #11191f;
  cursor: pointer;
}
.task-video-screen::after {
  position: absolute;
  inset: auto 0 0;
  z-index: 1;
  height: 34%;
  background: linear-gradient(transparent, rgba(5, 14, 20, 0.42));
  content: "";
  pointer-events: none;
}
.task-toggle {
  position: absolute;
  top: 50%;
  left: 50%;
  z-index: 4;
  display: grid;
  place-items: center;
  width: 64px;
  height: 64px;
  padding: 0;
  border: 1px solid rgba(255, 255, 255, 0.72);
  border-radius: 50%;
  background: rgba(255, 255, 255, 0.88);
  box-shadow: 0 12px 30px rgba(5, 14, 20, 0.2);
  cursor: pointer;
  transform: translate(-50%, -50%);
  backdrop-filter: blur(8px);
  transition:
    opacity 160ms ease,
    transform 160ms ease;
}
.task-toggle:hover {
  transform: translate(-50%, -50%) scale(1.06);
}
.task-toggle span {
  width: 0;
  height: 0;
  margin-left: 4px;
  border-top: 9px solid transparent;
  border-bottom: 9px solid transparent;
  border-left: 15px solid var(--blue);
}
.task-toggle.is-playing {
  opacity: 0;
  pointer-events: none;
  visibility: hidden;
}
.task-toggle[hidden] {
  display: none;
}
.task-video:focus-visible {
  outline: 2px solid var(--blue);
  outline-offset: -4px;
}
.task-toggle.is-playing span {
  width: 15px;
  height: 18px;
  margin: 0;
  border: 0;
  background: linear-gradient(
    90deg,
    var(--blue) 0 36%,
    transparent 36% 64%,
    var(--blue) 64%
  );
}
.task-video-screen .task-index {
  z-index: 4;
}
.task-tag {
  color: var(--blue);
  font-size: 14px;
  font-weight: 650;
  letter-spacing: 0.07em;
  text-transform: uppercase;
}
.engine-stage.stage-e > circle:first-child {
  fill: url(#engine-blue);
}

/* Technical figure motion states. */
[data-flow-figure] .flow-threads path,
[data-flow-figure] .open-threads path,
[data-flow-figure] .field-paths path,
[data-flow-figure] .engine-main-line,
[data-flow-figure] .engine-feedback-line,
[data-flow-figure] .model-connector,
[data-flow-figure] .model-loop path {
  stroke-dasharray: 13 11;
  stroke-dashoffset: 0;
}
[data-flow-figure].is-flowing .flow-threads path,
[data-flow-figure].is-flowing .open-threads path,
[data-flow-figure].is-flowing .field-paths path,
[data-flow-figure].is-flowing .engine-main-line,
[data-flow-figure].is-flowing .engine-feedback-line,
[data-flow-figure].is-flowing .model-connector,
[data-flow-figure].is-flowing .model-loop path {
  animation: noe-flow-dash 1.05s linear infinite;
}
[data-flow-figure] .chart-line {
  stroke-dasharray: 1700;
  stroke-dashoffset: 1700;
}
[data-flow-figure].is-flowing .chart-line {
  animation: noe-chart-draw 2.4s cubic-bezier(0.2, 0.7, 0.2, 1) forwards;
}
[data-flow-figure] .chart-area {
  opacity: 0.18;
}
[data-flow-figure].is-flowing .chart-area {
  animation: noe-area-rise 1.8s 0.25s ease-out both;
}
[data-flow-figure].is-flowing .field-node,
[data-flow-figure].is-flowing .chart-point > circle:nth-of-type(2),
[data-flow-figure].is-flowing .engine-stage > circle:first-child,
[data-flow-figure].is-flowing .model-core > circle:nth-child(2) {
  transform-box: fill-box;
  transform-origin: center;
  animation: noe-node-pulse 2.2s ease-in-out infinite;
}
[data-flow-figure].is-flowing .field-node:nth-of-type(2),
[data-flow-figure].is-flowing .chart-point:nth-of-type(2),
[data-flow-figure].is-flowing .engine-stage:nth-of-type(3) {
  animation-delay: 0.24s;
}
[data-flow-figure].is-flowing .field-node:nth-of-type(3),
[data-flow-figure].is-flowing .chart-point:nth-of-type(3),
[data-flow-figure].is-flowing .engine-stage:nth-of-type(4) {
  animation-delay: 0.48s;
}

@keyframes noe-flow-dash {
  to {
    stroke-dashoffset: -48;
  }
}
@keyframes noe-chart-draw {
  to {
    stroke-dashoffset: 0;
  }
}
@keyframes noe-area-rise {
  from {
    opacity: 0;
    transform: translateY(18px);
  }
  to {
    opacity: 1;
    transform: translateY(0);
  }
}
@keyframes noe-node-pulse {
  0%,
  100% {
    opacity: 0.78;
    transform: scale(0.96);
  }
  50% {
    opacity: 1;
    transform: scale(1.045);
  }
}

@media (max-width: 760px) {
  .section-index > span:first-child {
    width: 48px;
    height: 48px;
    font-size: 11px;
  }
  .task-toolbar {
    align-items: flex-start;
    margin-top: 40px;
  }
  .task-toolbar,
  .task-toolbar-controls {
    flex-direction: column;
  }
  .task-toolbar-controls {
    width: 100%;
  }
  .task-toolbar button {
    width: 100%;
  }
  .task-toolbar [data-task-status] {
    text-align: left;
  }
  .task-toggle {
    width: 54px;
    height: 54px;
  }
}

@media (prefers-reduced-motion: reduce) {
  .task-grid,
  .task-toolbar button,
  .task-video-screen,
  .task-toggle,
  [data-flow-figure] * {
    animation: none !important;
    transition: none !important;
  }
  [data-flow-figure] .chart-line {
    stroke-dashoffset: 0;
  }
  [data-flow-figure] .chart-area {
    opacity: 1;
  }
}

/* Technical figure components. */
.data-cloud circle {
  stroke: rgba(20, 39, 53, 0.18);
  stroke-width: 1.5;
}
.natural-cloud circle:nth-of-type(4n + 1) {
  fill: rgba(185, 218, 25, 0.72);
}
.natural-cloud circle:nth-of-type(4n + 2) {
  fill: rgba(0, 191, 232, 0.62);
}
.natural-cloud circle:nth-of-type(4n + 3) {
  fill: rgba(240, 172, 48, 0.64);
}
.natural-cloud circle:nth-of-type(4n) {
  fill: rgba(0, 125, 206, 0.5);
}
.teleop-cloud circle {
  fill: rgba(239, 86, 44, 0.58);
  stroke: rgba(171, 54, 30, 0.42);
}
.data-cloud text,
.robot-capability > text {
  fill: var(--muted);
  font: 560 13px var(--body);
  text-anchor: middle;
}
.training-node circle {
  fill: #fff;
  stroke: var(--blue);
  stroke-width: 2.5;
}
.training-node text {
  fill: var(--ink);
  font: 650 17px var(--body);
  text-anchor: middle;
}
.training-node .node-sub {
  fill: var(--muted);
  font-size: 12px;
  font-weight: 500;
}
.bottleneck-node circle {
  fill: rgba(239, 86, 44, 0.09);
  stroke: var(--orange);
}
.bottleneck-node .node-sub {
  fill: var(--orange);
  font-weight: 650;
}
.knowledge-rail {
  fill: none;
  stroke: #5f737f;
  stroke-width: 2.4;
  stroke-linecap: round;
}
.rail-warning {
  stroke: rgba(239, 86, 44, 0.72);
}
.rail-open {
  stroke: var(--blue);
  stroke-width: 3;
}
.robot-capability rect {
  fill: #fff;
  stroke: var(--line-strong);
  stroke-width: 1.5;
}
.robot-capability g rect {
  fill: rgba(0, 125, 206, 0.08);
  stroke: var(--blue);
  stroke-width: 2;
}
.robot-capability g circle {
  fill: var(--blue);
}
.robot-capability g path {
  fill: rgba(0, 125, 206, 0.08);
  stroke: var(--blue);
  stroke-width: 3;
  stroke-linecap: round;
  stroke-linejoin: round;
}
.constrained-robot {
  opacity: 0.76;
}
.constrained-robot g rect,
.constrained-robot g path {
  stroke: var(--orange);
}
.constrained-robot g circle {
  fill: var(--orange);
}
.capable-robot rect:first-child {
  stroke: rgba(0, 125, 206, 0.42);
}

.engine-rails path {
  fill: none;
  stroke-linecap: round;
  stroke-linejoin: round;
}
.engine-rails .rail-base {
  stroke: rgba(20, 39, 53, 0.13);
  stroke-width: 12;
}
.engine-rails .rail-flow {
  stroke: var(--blue);
  stroke-width: 2.5;
  stroke-dasharray: 11 10;
}
.engine-rails .feedback-flow {
  stroke: var(--orange);
}
.engine-card > rect {
  fill: rgba(255, 255, 255, 0.96);
  stroke: var(--line);
  stroke-width: 1.5;
}
.engine-card .stage-title {
  fill: var(--ink);
  font: 650 20px var(--body);
  text-anchor: start;
}
.engine-card .stage-copy {
  fill: var(--muted);
  font: 430 13px var(--body);
  text-anchor: start;
}
.engine-icon {
  fill: none;
  stroke: var(--blue);
  stroke-width: 3;
  stroke-linecap: round;
  stroke-linejoin: round;
}
.engine-icon .icon-accent {
  stroke: var(--orange);
}
.capture-card .engine-icon .icon-accent,
.training-card .engine-icon .icon-accent {
  fill: rgba(185, 218, 25, 0.24);
  stroke: #8da700;
}
.quality-card .engine-icon .icon-accent {
  stroke: #8da700;
  stroke-width: 5;
}
.annotation-card .engine-icon .icon-accent {
  stroke: var(--yellow);
}
.evaluation-card .engine-icon .icon-accent {
  stroke: var(--orange);
}
.node-code {
  fill: rgba(20, 39, 53, 0.54);
  font:
    600 11px "SFMono-Regular",
    Consolas,
    monospace;
  letter-spacing: 0.08em;
}
.feedback-pill text {
  font-size: 14px;
}

.x-labels text {
  fill: var(--muted);
  font: 450 13px var(--body);
  text-anchor: middle;
}
.curve-legend text {
  fill: var(--ink-soft);
  font: 550 13px var(--body);
}
.curve-legend path {
  fill: none;
  stroke-width: 4;
  stroke-linecap: round;
}
.curve-legend .legend-100 path {
  stroke: var(--blue);
}
.curve-legend .legend-100 circle {
  fill: var(--blue);
}
.curve-legend .legend-20 path {
  stroke: #91ad00;
}
.curve-legend .legend-20 circle {
  fill: #91ad00;
}
.curve-legend .legend-10 path {
  stroke: var(--orange);
}
.curve-legend .legend-10 circle {
  fill: var(--orange);
}
.loss-curve polyline {
  fill: none;
  stroke-width: 4;
  stroke-linecap: round;
  stroke-linejoin: round;
}
.loss-curve .curve-dots circle {
  stroke: #fff;
  stroke-width: 1.5;
}
.loss-curve > text {
  fill: var(--ink);
  font: 650 14px var(--body);
}
.curve-100 polyline {
  stroke: var(--blue);
}
.curve-100 .curve-dots circle {
  fill: var(--blue);
}
.curve-20 polyline {
  stroke: #91ad00;
}
.curve-20 .curve-dots circle {
  fill: #91ad00;
}
.curve-10 polyline {
  stroke: var(--orange);
}
.curve-10 .curve-dots circle {
  fill: var(--orange);
}
.protocol-grid {
  display: grid;
  grid-template-columns: repeat(3, minmax(0, 1fr));
  width: min(1100px, 100%);
  margin: 76px auto 0;
  border-top: 1px solid var(--line-strong);
}

.protocol-grid article {
  min-width: 0;
  padding: 34px 30px;
  border-left: 1px solid var(--line);
}
.protocol-grid article:first-child {
  border-left: 0;
}
.protocol-grid article > span {
  color: var(--blue);
  font: 700 13px var(--body);
  letter-spacing: 0.08em;
}
.protocol-grid h3 {
  margin-top: 36px;
  font-family: var(--display);
  font-size: 31px;
  font-weight: 470;
  letter-spacing: -0.035em;
  line-height: 1.18;
}
.protocol-grid p {
  margin-top: 17px;
  color: var(--muted);
  font-size: 15px;
  line-height: 1.72;
}

.parallel-core {
  filter: drop-shadow(0 20px 28px rgba(0, 125, 206, 0.17));
}
.parallel-core .model-core-title {
  fill: #fff;
  font: 680 31px var(--body);
  text-anchor: middle;
}
.simultaneous-pill rect {
  fill: rgba(255, 255, 255, 0.16);
  stroke: rgba(255, 255, 255, 0.42);
}
.simultaneous-pill text {
  fill: #fff;
  font: 700 11px var(--body);
  letter-spacing: 0.08em;
  text-anchor: middle;
}
.imagination-panel > rect,
.planning-panel > rect {
  fill: rgba(255, 255, 255, 0.94);
  stroke: rgba(255, 255, 255, 0.52);
}
.imagination-panel > text,
.planning-panel > text {
  fill: var(--ink);
  font: 650 13px var(--body);
  text-anchor: middle;
}
.latent-overlay {
  fill: rgba(0, 125, 206, 0.48);
}
.latent-points path {
  fill: none;
  stroke: rgba(255, 255, 255, 0.68);
  stroke-width: 1.5;
}
.latent-points circle {
  fill: var(--green);
  stroke: #fff;
  stroke-width: 1.5;
}
.plan-grid > path:first-child {
  fill: none;
  stroke: rgba(20, 39, 53, 0.1);
  stroke-width: 1;
}
.plan-grid .planned-path {
  fill: none;
  stroke: var(--orange);
  stroke-width: 4;
  stroke-linecap: round;
}
.plan-grid circle {
  fill: var(--orange);
  stroke: #fff;
  stroke-width: 1.5;
}
.parallel-link {
  fill: none;
  stroke: rgba(255, 255, 255, 0.72);
  stroke-width: 2;
  stroke-dasharray: 5 6;
}
.parallel-core .core-note {
  fill: rgba(255, 255, 255, 0.9);
  font: 560 13px var(--body);
  text-anchor: middle;
}
.precise-trajectory rect {
  fill: #fff;
  stroke: rgba(0, 125, 206, 0.22);
  stroke-width: 1.5;
}
.precise-trajectory > path {
  fill: none;
  stroke: var(--orange);
  stroke-width: 4;
  stroke-linecap: round;
}
.precise-trajectory > circle {
  fill: var(--orange);
  stroke: #fff;
  stroke-width: 2;
}
.robot-hand path {
  fill: rgba(0, 125, 206, 0.1);
  stroke: var(--blue);
  stroke-width: 3;
  stroke-linecap: round;
  stroke-linejoin: round;
}
.robot-hand circle {
  fill: var(--green);
  stroke: #809800;
  stroke-width: 2;
}
.model-loop rect {
  fill: rgba(185, 218, 25, 0.13);
  stroke: rgba(126, 149, 18, 0.42);
}
.model-loop text {
  fill: var(--ink);
  font: 560 14px var(--body);
  text-anchor: middle;
}
.model-loop .loop-sub {
  fill: var(--muted);
  font-size: 11px;
  font-weight: 450;
}

[data-flow-figure] .knowledge-rail,
[data-flow-figure] .engine-rails .rail-flow,
[data-flow-figure] .parallel-link,
[data-flow-figure] .model-connector,
[data-flow-figure] .model-loop > path {
  stroke-dasharray: 11 10;
}
[data-flow-figure].is-flowing .knowledge-rail,
[data-flow-figure].is-flowing .engine-rails .rail-flow,
[data-flow-figure].is-flowing .parallel-link,
[data-flow-figure].is-flowing .model-connector,
[data-flow-figure].is-flowing .model-loop > path {
  animation: noe-flow-dash 1.05s linear infinite;
}
[data-flow-figure] .loss-curve polyline {
  stroke-dasharray: 1800;
  stroke-dashoffset: 1800;
}
[data-flow-figure] .loss-curve .curve-dots {
  opacity: 0;
}
[data-flow-figure].is-flowing .loss-curve polyline {
  animation: noe-chart-draw 2.4s cubic-bezier(0.2, 0.7, 0.2, 1) forwards;
}
[data-flow-figure].is-flowing .loss-curve .curve-dots {
  animation: noe-dots-in 0.5s 1.75s ease-out forwards;
}
@keyframes noe-dots-in {
  to {
    opacity: 1;
  }
}

@media (max-width: 760px) {
  .protocol-grid {
    grid-template-columns: minmax(0, 1fr);
    margin-top: 56px;
  }
  .protocol-grid article {
    padding: 30px 10px;
    border-top: 1px solid var(--line);
    border-left: 0;
  }
  .protocol-grid article:first-child {
    border-top: 0;
  }
  .protocol-grid h3 {
    margin-top: 24px;
    font-size: 29px;
  }
  .continuity-figure,
  .engine-figure,
  .model-figure,
  .scaling-figure {
    width: 100%;
    margin-right: 0;
    margin-left: 0;
    overflow: hidden;
  }
  .continuity-figure svg,
  .engine-figure svg,
  .model-figure svg,
  .scaling-figure svg {
    display: block;
    width: 100%;
    max-width: 100%;
    height: auto;
  }
  .continuity-figure > figcaption,
  .engine-figure > figcaption,
  .model-figure > figcaption,
  .scaling-figure > figcaption {
    grid-template-columns: minmax(0, 1fr);
    gap: 6px;
    width: 100%;
    margin-right: 0;
    margin-left: 0;
  }
  .continuity-figure::after {
    display: none;
    content: none;
  }
  .engine-card .stage-copy,
  .engine-card .node-code,
  .data-cloud text,
  .robot-capability > text,
  .parallel-core .core-note,
  .model-loop .loop-sub {
    display: none;
  }
}

@media (prefers-reduced-motion: reduce) {
  [data-flow-figure] .loss-curve polyline {
    stroke-dashoffset: 0;
  }
  [data-flow-figure] .loss-curve .curve-dots {
    opacity: 1;
  }
}

/* Chapter navigation and production figures. */
:root {
  --toc-rail: 228px;
  --toc-half: 114px;
}

.site-nav {
  width: 190px;
  max-height: calc(100svh - 132px);
  padding: 8px 12px 12px 0;
  overflow-y: auto;
  scrollbar-width: thin;
}
.toc-group {
  display: grid;
}
.site-nav .toc-main {
  grid-template-columns: 28px 1fr;
  padding: 10px 0;
  border-top: 1px solid var(--line);
  font-size: 14px;
}
.toc-group:last-child .toc-main {
  border-bottom: 1px solid var(--line);
}
.toc-sub {
  display: grid;
  padding: 3px 0 8px;
}
.site-nav .toc-sub a {
  grid-template-columns: 34px minmax(0, 1fr);
  gap: 7px;
  padding: 6px 0 6px 10px;
  border: 0;
  color: var(--muted);
  font-size: 14px;
  font-weight: 560;
  line-height: 1.28;
}
.site-nav .toc-sub a::after {
  top: 5px;
  bottom: 5px;
  left: 0;
}
.site-nav .toc-main.is-active,
.site-nav .toc-sub a.is-active {
  color: var(--ink);
}

.mobile-menu-main,
.mobile-menu-sub {
  display: grid;
  grid-template-columns: auto 1fr;
  gap: 10px;
}
.mobile-menu-sub {
  padding-left: 22px !important;
  color: var(--muted) !important;
  font-size: 13px !important;
}

.toc-world-action {
  white-space: nowrap;
}

.chapter-divider {
  position: relative;
  isolation: isolate;
  display: grid;
  grid-template-columns: minmax(0, 0.65fr) minmax(320px, 1.35fr);
  gap: clamp(36px, 7vw, 110px);
  align-content: center;
  min-height: min(84svh, 820px);
  padding: clamp(92px, 11vw, 156px) var(--gutter);
  overflow: hidden;
  border-top: 1px solid rgba(0, 125, 206, 0.18);
  border-bottom: 1px solid rgba(0, 125, 206, 0.16);
}
.chapter-divider::before {
  position: absolute;
  top: 50%;
  right: -8vw;
  z-index: -1;
  width: min(62vw, 900px);
  aspect-ratio: 1;
  border: 1px solid rgba(0, 125, 206, 0.12);
  border-radius: 50%;
  box-shadow:
    0 0 0 74px rgba(0, 191, 232, 0.028),
    0 0 0 148px rgba(0, 125, 206, 0.018);
  content: "";
  transform: translateY(-50%);
}
.chapter-data {
  background: linear-gradient(135deg, #fbfbfa 0%, #f5fbfd 56%, #eef8fc 100%);
}
.chapter-model {
  background: linear-gradient(135deg, #f8fbfc 0%, #edf7fb 58%, #f8fbfc 100%);
}
.chapter-infrastructure {
  background: linear-gradient(135deg, #fbfbfa 0%, #f1f8fb 50%, #fff 100%);
}
.chapter-divider > div {
  grid-column: 2;
  display: grid;
  grid-template-columns: auto 1fr;
  gap: clamp(20px, 3vw, 44px);
  align-items: start;
}
.chapter-divider h2 {
  max-width: 850px;
  font-family: var(--display);
  font-size: clamp(54px, 6.3vw, 94px);
  font-weight: 470;
  letter-spacing: -0.052em;
  line-height: 0.98;
}
.capture-explainer {
  display: grid;
  grid-template-columns: minmax(260px, 0.72fr) minmax(520px, 1.28fr);
  gap: clamp(34px, 6vw, 92px);
  align-items: center;
  width: min(1300px, 100%);
  margin: 92px auto 0;
}
.capture-copy h3,
.field-copy h3 {
  margin-top: 16px;
  font-family: var(--display);
  font-size: clamp(38px, 4.2vw, 62px);
  font-weight: 470;
  letter-spacing: -0.045em;
  line-height: 1.04;
}
.capture-copy > p:last-child,
.field-copy > p {
  margin-top: 28px;
  color: var(--ink-soft);
  line-height: 1.8;
}
.continuity-figure,
.city-field-figure,
.infrastructure-figure {
  border: 1px solid rgba(20, 39, 53, 0.12);
  border-radius: 30px;
  background: #fff;
  box-shadow: 0 24px 70px rgba(0, 87, 145, 0.07);
}
.continuity-figure svg,
.city-field-figure svg,
.infrastructure-figure svg {
  width: 100%;
  height: auto;
  font-family: var(--body);
}
.continuity-figure .figure-paper,
.city-field-figure .figure-paper,
.infrastructure-figure .figure-paper {
  fill: #fbfbfa;
}
.continuity-figure .figure-heading,
.city-field-figure .figure-heading,
.infrastructure-figure .figure-heading {
  fill: var(--ink);
  font: 660 24px var(--body);
  letter-spacing: -0.02em;
}
.continuity-figure .compare-tag,
.continuity-figure .lane-eyebrow {
  fill: var(--blue);
  font: 720 12px var(--body);
  letter-spacing: 0.1em;
}
.continuity-figure .compare-tag {
  text-anchor: end;
}
.trajectory-lane > rect {
  stroke: rgba(20, 39, 53, 0.12);
  stroke-width: 1.3;
}
.conventional-trajectory > rect {
  fill: rgba(240, 172, 48, 0.07);
}
.noe-trajectory > rect {
  fill: rgba(0, 191, 232, 0.055);
}
.knowledge-cluster circle {
  fill: rgba(0, 191, 232, 0.18);
  stroke: var(--sky);
  stroke-width: 1.4;
}
.knowledge-cluster circle:nth-child(2n) {
  fill: rgba(185, 218, 25, 0.2);
  stroke: #8ca610;
}
.knowledge-cluster text {
  fill: var(--muted);
  font: 580 12px var(--body);
  text-anchor: middle;
}
.continuity-figure .knowledge-rail {
  fill: none;
  stroke: #6f828d;
  stroke-width: 2.2;
  vector-effect: non-scaling-stroke;
}
.continuity-figure .rail-warning {
  stroke: var(--orange);
}
.continuity-figure .rail-open {
  stroke: var(--blue);
}
.stage-card rect,
.trajectory-card rect {
  fill: #fff;
  stroke: rgba(20, 39, 53, 0.16);
  stroke-width: 1.4;
}
.stage-card > text,
.continuity-gate > text {
  fill: var(--ink);
  font: 650 16px var(--body);
  text-anchor: middle;
}
.stage-card .stage-note,
.continuity-gate > text:last-child {
  fill: var(--muted);
  font-size: 12px;
}
.stage-card .stage-code {
  fill: var(--blue);
  font: 720 10px var(--body);
  letter-spacing: 0.08em;
}
.bottleneck-funnel > path {
  fill: url(#bottleneck-fill);
  stroke: var(--orange);
  stroke-width: 2;
}
.bottleneck-funnel text {
  fill: var(--ink);
  font: 600 12px var(--body);
  text-anchor: middle;
}
.bottleneck-funnel .funnel-main {
  fill: #b63a1b;
  font-size: 11px;
  font-weight: 760;
}
.continuity-gate rect {
  fill: url(#continuity-fill);
  stroke: var(--blue);
  stroke-width: 2;
}
.continuity-gate .gate-main {
  fill: var(--blue);
  font-size: 11px;
  font-weight: 760;
}
.trajectory-card > text {
  fill: var(--ink);
  font: 620 13px var(--body);
}
.trajectory-card > polyline,
.trajectory-card-smooth > path {
  fill: none;
  stroke: var(--orange);
  stroke-width: 4;
  stroke-linecap: round;
  stroke-linejoin: round;
  vector-effect: non-scaling-stroke;
}
.trajectory-card-smooth > path {
  stroke: var(--blue);
}
.distribution-atlas {
  display: block;
  width: min(1380px, 100%);
  margin-top: 88px;
}
.city-field-figure {
  width: 100%;
}
.city-grid path {
  fill: none;
  stroke: rgba(20, 39, 53, 0.055);
  stroke-width: 1;
}
.city-edges path {
  fill: none;
  stroke: rgba(0, 125, 206, 0.3);
  stroke-width: 2;
  stroke-linecap: round;
  vector-effect: non-scaling-stroke;
}
.city-edges .city-sample-link {
  stroke: var(--blue);
  stroke-dasharray: 8 9;
}
.city-legend rect {
  fill: #fff;
  stroke: rgba(20, 39, 53, 0.13);
}
.city-legend circle {
  fill: var(--blue);
}
.city-legend text {
  fill: var(--muted);
  font: 720 10px var(--body);
  letter-spacing: 0.08em;
}
.city-nodes g circle {
  r: 5px;
  fill: var(--blue);
  stroke: #fff;
  stroke-width: 2;
}
.city-nodes g:nth-child(4n + 2) circle {
  fill: var(--green);
}
.city-nodes g:nth-child(4n + 3) circle {
  fill: var(--orange);
}
.city-nodes g:nth-child(4n) circle {
  fill: var(--yellow);
}
.city-nodes text {
  fill: var(--ink);
  font: 620 12px var(--body);
  transform: translate(10px, 4px);
}
.city-samples > g > rect {
  fill: #fff;
  stroke: rgba(20, 39, 53, 0.16);
  stroke-width: 1.5;
}
.city-samples > g > .city-sample-backdrop {
  fill: #10212c;
  stroke: none;
}
.city-samples image {
  filter: saturate(0.9) contrast(1.01);
}
.city-samples text {
  fill: #fff;
  paint-order: stroke;
  stroke: rgba(20, 39, 53, 0.72);
  stroke-width: 5px;
  stroke-linejoin: round;
  font: 720 10px var(--body);
  letter-spacing: 0.08em;
}
.distribution-atlas + .field-copy,
.distribution-atlas .field-copy {
  width: min(var(--reading), 100%);
  margin: 56px auto 0;
}
.distribution-atlas .field-copy h3 {
  max-width: 720px;
}
.metric-strip {
  grid-template-columns: repeat(3, minmax(0, 1fr));
}

.task-landscape {
  scroll-margin-top: 88px;
}
.task-landscape-head > p {
  font-family: var(--body);
}
.task-toolbar-controls {
  display: flex;
  gap: 12px;
}
.task-shuffle {
  min-width: 184px;
}

@keyframes noe-model-flow {
  to {
    stroke-dashoffset: -44;
  }
}

/* Figure 05 production chain and Figure 06 Data Agent layer. */
.infrastructure-figure .figure-sub,
.city-field-figure .figure-sub {
  fill: var(--muted);
  font: 480 13px var(--body);
}
.infra-grid path {
  fill: none;
  stroke: rgba(20, 39, 53, 0.055);
}
.infra-edges path {
  fill: none;
  stroke-linecap: round;
  stroke-linejoin: round;
  vector-effect: non-scaling-stroke;
}
.infra-base {
  stroke: rgba(20, 39, 53, 0.18);
  stroke-width: 3;
}
.infra-flow,
.agent-link {
  stroke: var(--blue);
  stroke-width: 2.5;
  stroke-dasharray: 8 8;
}
.infra-feedback {
  stroke: var(--blue);
  stroke-width: 2.5;
  stroke-dasharray: 12 12;
}
.infrastructure-figure.is-flowing .infra-flow,
.infrastructure-figure.is-flowing .agent-link,
.infrastructure-figure.is-flowing .infra-feedback {
  animation: noe-model-flow 1.5s linear infinite;
}
.infrastructure-figure.is-flowing .infra-feedback {
  animation-duration: 2.3s;
}
.infra-lane-label rect {
  fill: #fff;
  stroke: rgba(20, 39, 53, 0.13);
}
.infra-lane-label text {
  fill: var(--blue);
  font: 720 10px var(--body);
  letter-spacing: 0.08em;
}
.infra-stage > rect {
  fill: #fff;
  stroke: rgba(20, 39, 53, 0.16);
  stroke-width: 1.4;
}
.infra-stage:nth-child(3n + 1) > rect {
  fill: rgba(0, 191, 232, 0.055);
}
.infra-stage:nth-child(3n + 2) > rect {
  fill: rgba(185, 218, 25, 0.055);
}
.infra-stage:nth-child(3n) > rect {
  fill: rgba(240, 172, 48, 0.055);
}
.infra-stage > text:not(.stage-note):not(.node-code):not(.stage-no) {
  fill: var(--ink);
  font: 650 13px var(--body);
}
.infra-stage .stage-no {
  fill: var(--blue);
  font: 760 10px var(--body);
  letter-spacing: 0.08em;
}
.infra-stage .stage-note {
  fill: var(--muted);
  font: 500 10px var(--body);
}
.infra-stage .node-code {
  fill: var(--blue);
  font: 700 9px ui-monospace, SFMono-Regular, Consolas, monospace;
}
.infra-stage .stage-icon {
  fill: none;
  stroke: var(--blue);
  stroke-width: 1.8;
  stroke-linecap: round;
  stroke-linejoin: round;
}
.infra-stage .stage-icon-dot {
  fill: rgba(0, 191, 232, 0.2);
  stroke: var(--blue);
}
.infra-agent > rect {
  filter: drop-shadow(0 18px 28px rgba(0, 125, 206, 0.18));
}
.infra-agent .agent-kicker,
.infra-agent .agent-title {
  fill: #fff;
}
.infra-agent .agent-kicker {
  font: 720 11px var(--body);
  letter-spacing: 0.09em;
}
.infra-agent .agent-title {
  font: 600 18px var(--body);
}
.agent-chips rect {
  fill: rgba(255, 255, 255, 0.14);
  stroke: rgba(255, 255, 255, 0.35);
}
.agent-chips text {
  fill: #fff;
  font: 650 10px var(--body);
  text-anchor: middle;
}
.infra-outcomes rect {
  fill: #fff;
  stroke: rgba(20, 39, 53, 0.16);
  stroke-width: 1.4;
}
.infra-outcomes text:first-of-type {
  fill: var(--blue);
  font: 720 10px ui-monospace, SFMono-Regular, Consolas, monospace;
}
.infra-outcomes .lang-zh,
.infra-outcomes .lang-en {
  fill: var(--ink);
  font: 620 13px var(--body);
}

.data-agent-panel {
  display: grid;
  grid-template-columns: minmax(0, 1.1fr) minmax(360px, 0.9fr);
  gap: clamp(38px, 7vw, 104px);
  width: min(1180px, 100%);
  margin: 92px auto 0;
  padding: 0;
  border: 0;
  border-radius: 0;
  background: transparent;
}
.data-agent-copy h3 {
  margin-top: 16px;
  font-family: var(--display);
  font-size: clamp(38px, 4vw, 58px);
  font-weight: 470;
  letter-spacing: -0.045em;
  line-height: 1.05;
}
.data-agent-copy > p:not(.overline) {
  margin-top: 24px;
  color: var(--ink-soft);
  line-height: 1.78;
}
.agent-feature-list {
  display: flex;
  flex-wrap: wrap;
  gap: 9px;
  margin-top: 30px;
}
.agent-feature-list > span {
  display: flex;
  gap: 8px;
  align-items: center;
  padding: 8px 12px;
  border: 1px solid rgba(0, 125, 206, 0.16);
  border-radius: 999px;
  background: #fff;
}
.agent-feature-list i {
  width: 6px;
  height: 6px;
  border-radius: 50%;
  background: var(--blue);
}
.agent-feature-list b {
  font-size: 12px;
  font-weight: 650;
}
@media (max-width: 1180px) {
  :root {
    --toc-rail: 0px;
    --toc-half: 0px;
  }
  .site-nav {
    display: none;
  }
  main,
  .site-footer {
    margin-left: 0;
  }
}

@media (max-width: 980px) {
  .chapter-divider {
    grid-template-columns: 1fr;
    min-height: min(76svh, 720px);
  }
  .chapter-divider > div {
    grid-column: 1;
  }
  .capture-explainer,
  .data-agent-panel {
    grid-template-columns: 1fr;
  }
  .metric-strip {
    grid-template-columns: repeat(3, minmax(0, 1fr));
  }
}

@media (max-width: 760px) {
  .wide-break {
    display: none;
  }

  .chapter-divider {
    min-height: auto;
    padding: 86px 18px 92px;
  }
  .chapter-divider > div {
    grid-template-columns: 1fr;
    gap: 20px;
  }
  .chapter-divider h2 {
    font-size: clamp(44px, 12vw, 58px);
  }
  .capture-explainer {
    gap: 36px;
    margin-top: 62px;
  }
  .capture-copy h3,
  .field-copy h3,
  .data-agent-copy h3 {
    font-size: clamp(38px, 10.8vw, 50px);
  }
  .distribution-atlas {
    margin-top: 62px;
  }
  .metric-strip {
    grid-template-columns: 1fr;
  }
  .task-landscape-head {
    grid-template-columns: 1fr;
  }
  .data-agent-panel {
    margin-top: 62px;
    padding: 30px 20px;
    border-radius: 22px;
  }
  .continuity-figure,
  .city-field-figure,
  .infrastructure-figure {
    width: 100%;
    overflow-x: auto;
    border-radius: 20px;
    overscroll-behavior-inline: contain;
  }
  .continuity-figure svg,
  .city-field-figure svg,
  .infrastructure-figure svg {
    width: 800px;
    max-width: none;
  }
  .continuity-figure > figcaption,
  .city-field-figure > figcaption,
  .infrastructure-figure > figcaption {
    position: sticky;
    left: 0;
    width: calc(100vw - 36px);
    max-width: none;
    background: #fff;
  }
}

@media (prefers-reduced-motion: reduce) {
  .infrastructure-figure .infra-flow,
  .infrastructure-figure .agent-link,
  .infrastructure-figure .infra-feedback {
    animation: none !important;
  }
}

/* Editorial layout. */
:root {
  --section-title-width: 860px;
  --figure-width: 1180px;
}

body {
  background:
    radial-gradient(circle at 88% 4%, rgba(0, 191, 232, 0.07), transparent 28rem),
    radial-gradient(circle at 12% 34%, rgba(0, 125, 206, 0.045), transparent 34rem),
    #fdfcf8;
}

.chapter-divider {
  display: grid;
  grid-template-columns: minmax(0, 1fr);
  place-items: center;
  min-height: clamp(500px, 68svh, 760px);
  padding: clamp(92px, 12vw, 168px) max(24px, calc((100vw - 1180px) / 2));
  text-align: left;
}

.chapter-divider .chapter-heading {
  display: block;
  grid-column: 1;
  min-width: 0;
  width: min(100%, 1120px);
  margin: 0 auto;
}

.chapter-divider .chapter-heading h2 {
  max-width: 100%;
  margin: 0;
  font-family: var(--display);
  font-size: clamp(86px, 12vw, 172px);
  font-weight: 440;
  letter-spacing: -0.075em;
  line-height: 0.84;
}

html[data-lang="en"] .chapter-infrastructure .chapter-heading h2 {
  font-size: clamp(76px, 10.4vw, 150px);
  letter-spacing: -0.055em;
}

.chapter-divider .chapter-subtitle {
  max-width: 900px;
  margin: clamp(36px, 5vw, 64px) 0 0;
  color: var(--ink-soft);
  font-family: var(--body);
  font-size: clamp(22px, 2.5vw, 34px);
  font-weight: 500;
  letter-spacing: -0.02em;
  line-height: 1.25;
}

html[data-lang="zh"] .chapter-divider .chapter-subtitle span {
  white-space: nowrap;
}

.article-section .section-intro h2,
.task-landscape-head h2,
.capture-copy h3,
.distribution-atlas .field-copy h3,
.data-agent-copy h3 {
  width: 100%;
  max-width: var(--section-title-width);
}

.capture-explainer,
.distribution-atlas,
.continuity-figure,
.model-figure-v3,
.infrastructure-figure-v2,
.model-demo-reel,
.data-agent-panel {
  width: min(var(--figure-width), 100%);
}

.robopocket-visual {
  align-self: center;
  min-width: 0;
}

.robopocket-hardware-stage {
  position: relative;
  display: grid;
  place-items: center;
  min-height: 360px;
  overflow: hidden;
  border: 1px solid rgba(20, 39, 53, 0.12);
  border-radius: 28px;
  background:
    linear-gradient(rgba(0, 125, 206, 0.035) 1px, transparent 1px),
    linear-gradient(90deg, rgba(0, 125, 206, 0.035) 1px, transparent 1px),
    #fff;
  background-size: 34px 34px;
}

.robopocket-hardware-stage::before {
  position: absolute;
  inset: 8% 12%;
  border-radius: 50%;
  background: radial-gradient(circle, rgba(0, 191, 232, 0.11), transparent 68%);
  content: "";
}

.robopocket-hardware-stage img {
  position: relative;
  z-index: 1;
  width: min(92%, 860px);
  height: auto;
  object-fit: contain;
  filter: drop-shadow(0 22px 26px rgba(20, 39, 53, 0.13));
}

.robopocket-view-key {
  display: grid;
  grid-template-columns: repeat(3, minmax(0, 1fr));
  gap: 10px;
  margin-top: 14px;
}

.robopocket-view-key span {
  display: flex;
  gap: 9px;
  align-items: center;
  min-height: 48px;
  padding: 11px 14px;
  border: 1px solid rgba(0, 125, 206, 0.14);
  border-radius: 14px;
  background: rgba(255, 255, 255, 0.88);
}

.robopocket-view-key i {
  flex: 0 0 auto;
  width: 8px;
  height: 8px;
  border-radius: 50%;
  background: var(--blue);
}

.robopocket-view-key span:nth-child(2) i { background: var(--orange); }
.robopocket-view-key span:nth-child(3) i { background: var(--yellow); }
.robopocket-view-key b { font-size: 13px; font-weight: 650; }

.continuity-figure,
.city-field-figure,
.model-figure-v3,
.infrastructure-figure-v2 {
  overflow: hidden;
  border: 1px solid rgba(20, 39, 53, 0.12);
  border-radius: 30px;
  background: #fff;
  box-shadow: 0 24px 70px rgba(0, 87, 145, 0.07);
}

.continuity-figure svg,
.city-field-figure svg,
.model-figure-v3 svg,
.infrastructure-figure-v2 svg {
  display: block;
  width: 100%;
  height: auto;
  font-family: var(--body);
}

.continuity-figure .figure-paper,
.city-field-figure .figure-paper,
.model-figure-v3 .figure-paper,
.infrastructure-figure-v2 .figure-paper {
  fill: #fffefa;
  stroke: rgba(20, 39, 53, 0.08);
}

.continuity-figure .figure-heading,
.city-field-figure .figure-heading,
.infrastructure-figure-v2 .figure-heading {
  fill: var(--ink);
  font: 660 24px var(--body);
  letter-spacing: -0.02em;
}

.continuity-figure .figure-sub,
.city-field-figure .figure-sub,
.infrastructure-figure-v2 .figure-sub {
  fill: var(--muted);
  font: 500 15px var(--body);
}

.continuity-figure .lane-eyebrow {
  font-size: 13px;
}

.continuity-figure .knowledge-cluster text {
  font-size: 13px;
}

.continuity-figure .stage-card > text,
.continuity-figure .continuity-gate > text {
  font-size: 11px;
}

.continuity-figure .stage-card .stage-note,
.continuity-figure .continuity-gate > text:last-child {
  font-size: 13px;
}

.continuity-figure .stage-card .stage-code {
  font-size: 10px;
}

.continuity-figure .funnel-label-plate {
  fill: #fff;
  stroke: rgba(239, 86, 44, 0.28);
}

.continuity-figure .funnel-label {
  fill: #a63a22;
  font: 760 10px var(--body);
  letter-spacing: 0.045em;
}

.continuity-figure .bottleneck-funnel > path {
  fill: url(#bottleneck-fill);
  stroke: var(--orange);
  stroke-width: 2;
}

.continuity-figure .funnel-axis {
  stroke: rgba(239, 86, 44, 0.34);
  stroke-dasharray: 3 5;
}

.continuity-figure .bottleneck-funnel .funnel-main {
  fill: #a63a22;
  font-size: 12px;
  font-weight: 760;
}

.continuity-figure .trajectory-card > text {
  font-size: 14px;
}

.continuity-figure .trajectory-card > circle {
  fill: #fff;
  stroke: var(--orange);
  stroke-width: 2;
}

.continuity-figure .trajectory-card-smooth > circle {
  stroke: var(--blue);
}

.continuity-figure .trajectory-runner,
.model-figure-v3 .trajectory-runner {
  fill: var(--yellow);
  stroke: #fff;
  stroke-width: 2;
}

.city-field-figure .city-grid { display: none; }
.city-field-figure .city-edges path {
  fill: none;
  stroke: var(--blue);
  stroke-width: 2.5;
  stroke-dasharray: 9 9;
  stroke-linecap: round;
  animation: noe-model-flow 1.7s linear infinite paused;
}

.city-field-figure.is-flowing .city-edges path {
  animation-play-state: running;
}

.city-field-figure .city-legend text {
  font-size: 11px;
}

.city-coordinate-field > rect {
  fill: rgba(255, 255, 255, 0.54);
  stroke: rgba(0, 125, 206, 0.16);
  stroke-width: 1.4;
  stroke-dasharray: 5 7;
}

.city-coordinate-field .geo-axis {
  fill: var(--muted);
  font: 700 10px ui-monospace, SFMono-Regular, Consolas, monospace;
  letter-spacing: 0.09em;
}

.city-region > rect {
  fill: #fff;
  stroke: rgba(0, 125, 206, 0.22);
  stroke-width: 1.4;
}

.city-region-north > rect { fill: rgba(0, 191, 232, 0.065); }
.city-region-east > rect { fill: rgba(0, 125, 206, 0.055); }
.city-region-central > rect { fill: rgba(240, 172, 48, 0.075); stroke: rgba(189, 122, 8, 0.24); }
.city-region-southwest > rect { fill: rgba(185, 218, 25, 0.075); stroke: rgba(124, 149, 16, 0.24); }
.city-region-south > rect { fill: rgba(239, 86, 44, 0.055); stroke: rgba(239, 86, 44, 0.22); }

.city-region .city-region-title {
  fill: var(--blue);
  font: 760 13px var(--body);
  letter-spacing: 0.02em;
}

.city-region-central .city-region-title { fill: #9f6505; }
.city-region-southwest .city-region-title { fill: #667b0c; }
.city-region-south .city-region-title { fill: #ad3e21; }

.city-region-list text {
  fill: var(--ink-soft);
  font: 590 11px var(--body);
}

.city-region-list.compact text {
  font-size: 9.5px;
}

.city-region-list .city-anchor-name {
  fill: var(--blue);
  font-weight: 740;
}

.city-anchor-dots circle {
  fill: var(--blue);
  stroke: #fff;
  stroke-width: 3;
}

.city-field-figure .city-samples text {
  font-size: 11px;
}

.distribution-atlas .field-copy h3 {
  max-width: var(--section-title-width);
}

.model-figure-v3 svg text { fill: var(--ink); }
.model-figure-v3 .mono { font-family: ui-monospace, SFMono-Regular, Consolas, monospace; letter-spacing: 0.045em; }
.model-figure-v3 .figure-title { font-size: 25px; font-weight: 650; letter-spacing: -0.018em; }
.model-figure-v3 .figure-kicker,
.model-figure-v3 .stage-label { fill: var(--blue); font-size: 14px; font-weight: 720; }
.model-figure-v3 .node-title { font-size: 18px; font-weight: 720; }
.model-figure-v3 .world-title-en { font-size: 16px; }
.model-figure-v3 .node-subtitle { fill: var(--muted); font-size: 14px; }
.model-figure-v3 .micro { fill: var(--muted); font-size: 13px; font-weight: 680; }
.model-figure-v3 .card { fill: #fff; stroke: rgba(20, 39, 53, 0.16); stroke-width: 1.5; }
.model-figure-v3 .core-card { stroke: var(--blue); stroke-width: 2; }
.model-figure-v3 .panel { fill: rgba(255,255,255,.94); stroke: rgba(20,39,53,.15); stroke-width: 1.4; }
.model-figure-v3 .image-frame { fill: #e9eef0; stroke: rgba(20,39,53,.18); stroke-width: 1.2; }
.model-figure-v3 .token-pill { fill: var(--paper-blue); stroke: rgba(0,125,206,.22); }
.model-figure-v3 .token-text { fill: #315467; font-size: 13px; font-weight: 700; }
.model-figure-v3 .model-attention-pill { fill: var(--blue); }
.model-figure-v3 .attention-label {
  fill: #fff;
  font-size: 13.5px;
  font-weight: 760;
  letter-spacing: 0.015em;
}
.model-figure-v3 .latent-tint { fill: rgba(0,191,232,.18); }
.model-figure-v3 .chunk-cell { fill: rgba(239,86,44,.1); stroke: rgba(239,86,44,.45); }
.model-figure-v3 .chunk-cell.current { fill: var(--orange); stroke: var(--orange); }
.model-figure-v3 .chunk-cell.current + text { fill: #fff; }
.model-figure-v3 .token-attention-bridge { stroke: var(--blue); stroke-width: 3; }
.model-figure-v3 .attention-node { fill: #fff; stroke: var(--blue); stroke-width: 2; }
.model-figure-v3 .model-v3-edges path { fill: none; stroke: var(--blue); stroke-width: 2.8; stroke-dasharray: 10 11; stroke-linecap: round; }
.model-figure-v3 .model-v3-edges path { animation: noe-model-flow 1.7s linear infinite paused; }
.model-figure-v3.is-flowing .model-v3-edges path { animation-play-state: running; }
.model-figure-v3 .trajectory { fill: none; stroke: var(--orange); stroke-width: 4; stroke-linecap: round; marker-end: url(#model-arrow-orange); }
.model-figure-v3 .trajectory-point { fill: #fff; stroke: var(--orange); stroke-width: 3; }

.model-insight {
  position: relative;
  width: min(980px, 100%);
  margin: clamp(64px, 7vw, 96px) auto 0;
  padding: clamp(34px, 4.5vw, 58px);
  overflow: hidden;
  border: 1px solid rgba(0, 125, 206, 0.2);
  border-radius: 28px;
  background:
    radial-gradient(circle at 92% 12%, rgba(0, 191, 232, 0.12), transparent 18rem),
    linear-gradient(145deg, rgba(242, 248, 250, 0.96), #fff 66%);
  box-shadow: 0 24px 58px rgba(0, 87, 145, 0.08);
}

.model-insight::before {
  position: absolute;
  top: 0;
  bottom: 0;
  left: 0;
  width: 5px;
  background: linear-gradient(180deg, var(--blue), var(--sky));
  content: "";
}

.model-insight .overline {
  margin: 0;
  color: var(--blue);
  font: 760 12px/1.4 ui-monospace, SFMono-Regular, Consolas, monospace;
  letter-spacing: 0.09em;
}

.model-insight h3 {
  max-width: 24ch;
  margin: 26px 0 0;
  color: var(--ink);
  font-family: var(--display);
  font-size: clamp(35px, 4vw, 54px);
  font-weight: 470;
  letter-spacing: -0.04em;
  line-height: 1.08;
}

.model-insight > p:last-child {
  max-width: 720px;
  margin: 24px 0 0;
  color: var(--ink-soft);
  font-size: 17px;
  line-height: 1.78;
}

.model-demo-reel {
  display: grid;
  gap: clamp(22px, 3vw, 34px);
  padding: clamp(22px, 3.2vw, 38px);
  overflow: hidden;
  border: 1px solid rgba(20, 39, 53, 0.12);
  border-radius: 30px;
  background:
    linear-gradient(rgba(0, 125, 206, 0.035) 1px, transparent 1px),
    linear-gradient(90deg, rgba(0, 125, 206, 0.035) 1px, transparent 1px),
    #fff;
  background-size: 34px 34px, 34px 34px, auto;
  box-shadow: 0 24px 70px rgba(0, 87, 145, 0.07);
}

.model-demo-copy {
  display: grid;
  grid-template-columns: minmax(180px, 0.36fr) minmax(0, 0.64fr);
  gap: clamp(18px, 3vw, 42px);
  align-items: end;
  padding-bottom: clamp(18px, 2.5vw, 28px);
  border-bottom: 1px solid rgba(20, 39, 53, 0.1);
}

.model-demo-copy p {
  margin: 0;
  color: var(--blue);
  font: 760 12px/1.45 ui-monospace, SFMono-Regular, Consolas, monospace;
  letter-spacing: 0.08em;
}

.model-demo-copy h3 {
  margin: 0;
  color: var(--ink);
  font-family: var(--display);
  font-size: clamp(31px, 3.2vw, 48px);
  font-weight: 470;
  letter-spacing: -0.035em;
  line-height: 1.08;
}

.model-demo-grid {
  display: grid;
  grid-template-columns: repeat(2, minmax(0, 1fr));
  gap: clamp(14px, 2vw, 22px);
}

.model-demo-card {
  min-width: 0;
  overflow: hidden;
  border: 1px solid rgba(20, 39, 53, 0.12);
  border-radius: 18px;
  background: #fff;
}

.model-demo-card video {
  display: block;
  width: 100%;
  aspect-ratio: 16 / 9;
  height: auto;
  background: #101d24;
  object-fit: contain;
}

.model-demo-card figcaption {
  display: flex;
  grid-template-columns: none;
  align-items: center;
  justify-content: space-between;
  min-height: 44px;
  padding: 11px 14px;
  border-top: 1px solid rgba(20, 39, 53, 0.1);
  color: var(--muted);
  font: 740 11px/1.3 ui-monospace, SFMono-Regular, Consolas, monospace;
  letter-spacing: 0.08em;
}

.infrastructure-figure-v2 .infra-v2-edges path {
  fill: none;
  stroke: var(--blue);
  stroke-width: 2.7;
  stroke-dasharray: 10 10;
  stroke-linecap: round;
}

.infrastructure-figure-v2 .infra-v2-edges path,
.infrastructure-figure-v2 .agent-conversation {
  animation: noe-model-flow 1.6s linear infinite paused;
}

.infrastructure-figure-v2.is-flowing .infra-v2-edges path,
.infrastructure-figure-v2.is-flowing .agent-conversation {
  animation-play-state: running;
}

.infra-v2-stages > g > rect {
  fill: #fff;
  stroke: rgba(20, 39, 53, 0.15);
  stroke-width: 1.4;
}

.infra-v2-stages > g:nth-child(3n + 1) > rect { fill: rgba(0, 191, 232, 0.055); }
.infra-v2-stages > g:nth-child(3n + 2) > rect { fill: rgba(185, 218, 25, 0.06); }
.infra-v2-stages > g:nth-child(3n) > rect { fill: rgba(240, 172, 48, 0.06); }
.infra-v2-stages > g > text:not(.stage-note):not(.stage-no):not(.node-code) { fill: var(--ink); font: 660 18px var(--body); }
.infra-v2-stages .stage-no { fill: var(--blue); font: 760 12px var(--body); letter-spacing: .08em; }
.infra-v2-stages .stage-note { fill: var(--muted); font: 520 13px var(--body); }
.infra-v2-stages .node-code { fill: var(--blue); font: 700 10px ui-monospace, SFMono-Regular, Consolas, monospace; letter-spacing: .04em; }

.infra-agent-v2 > rect { stroke: rgba(0,125,206,.18); }
.infra-agent-v2 .agent-kicker { fill: var(--blue); font: 720 11px var(--body); letter-spacing: .08em; }
.infra-agent-v2 .agent-role rect { fill: #fff; stroke: rgba(20,39,53,.15); }
.infra-agent-v2 .agent-role text:not(.node-code) { fill: var(--ink); font: 650 15px var(--body); }
.infra-agent-v2 .node-code { fill: var(--muted); font: 680 9px ui-monospace, SFMono-Regular, Consolas, monospace; }
.infra-agent-v2 .agent-core rect { fill: var(--blue); }
.infra-agent-v2 .agent-core text { fill: #fff; font: 660 14px var(--body); }
.infra-agent-v2 .agent-core text:first-of-type { font-size: 19px; }
.infra-agent-v2 .agent-core .node-code { fill: rgba(255,255,255,.72); }
.infra-agent-v2 .agent-conversation { fill: none; stroke: var(--blue); stroke-width: 2.6; stroke-dasharray: 8 8; }

.agent-evidence {
  align-self: center;
  width: 100%;
  margin-right: auto;
  margin-left: auto;
  overflow: hidden;
  border: 1px solid rgba(20, 39, 53, 0.12);
  border-radius: 30px;
  background: #fff;
  box-shadow: 0 24px 70px rgba(0, 87, 145, 0.07);
}

/* Keep the single Chinese landscape asset at its own natural ratio at every
   breakpoint. The image, text, icons, and UI may never be stretched by CSS. */
@media (min-width: 901px) {
  .agent-evidence {
    width: min(940px, calc(114.7svh - 206.46px), 100%);
  }
}

@media (min-width: 600px) and (max-width: 900px) {
  .agent-evidence {
    width: min(430px, calc(46.8svh - 96.24px), 100%);
  }
}

@media (max-width: 599px) {
  .agent-evidence {
    width: min(100%, max(270px, calc(46.8svh - 107.94px)));
  }
}

.data-agent-panel {
  grid-template-columns: 1fr;
  gap: clamp(32px, 5vw, 56px);
}

.data-agent-copy {
  max-width: 820px;
}

.agent-evidence img {
  display: block;
  width: 100%;
  height: auto;
  aspect-ratio: auto;
  object-fit: contain;
}

.agent-evidence-grid {
  display: grid;
  grid-template-columns: 1fr;
  gap: clamp(20px, 3vw, 42px);
  align-items: center;
  padding: 0;
  background: transparent;
}

.agent-evidence-panel {
  display: grid;
  gap: 12px;
  min-width: 0;
}

.agent-evidence-panel picture {
  display: block;
  width: 100%;
}

.agent-evidence-panel img {
  border: 1px solid rgba(20, 39, 53, 0.1);
  border-radius: 16px;
  background: #fff;
  box-shadow: 0 16px 36px rgba(0, 87, 145, 0.08);
}

.agent-evidence-panel > span {
  color: var(--ink-soft);
  font-size: 13px;
  line-height: 1.5;
}

.agent-capability-panel img {
  width: 100%;
}

.agent-dialog-panel {
  order: 1;
  width: min(820px, 100%);
  margin: 0 auto;
}

.agent-capability-panel {
  order: -1;
  width: min(947px, 100%);
  margin: 0 auto;
}

.agent-quality-panel {
  display: grid;
  grid-template-columns: minmax(0, 1.12fr) minmax(280px, 0.88fr);
  gap: clamp(22px, 3.5vw, 48px);
  align-items: center;
  width: 100%;
  padding: clamp(20px, 3vw, 34px);
  border: 1px solid rgba(0, 125, 206, 0.14);
  border-radius: 20px;
  background: rgba(255, 255, 255, 0.86);
}

.agent-quality-visual,
.agent-quality-visual picture {
  display: block;
  min-width: 0;
  width: 100%;
}

.agent-quality-visual img {
  display: block;
  width: 100%;
  border: 0;
  border-radius: 0;
  box-shadow: none;
}

.agent-quality-panel.agent-quality-panel-single {
  padding: 0;
  border: 0;
  border-radius: 0;
  background: transparent;
}

.agent-quality-copy > p {
  color: var(--blue);
  font: 730 11px/1.4 ui-monospace, SFMono-Regular, Consolas, monospace;
  letter-spacing: 0.08em;
}

.agent-quality-copy h3 {
  margin-top: 12px;
  font-size: clamp(25px, 2.4vw, 36px);
  line-height: 1.08;
}

.agent-quality-copy ol {
  display: grid;
  gap: 9px;
  margin-top: 20px;
  padding: 0;
  list-style: none;
}

.agent-quality-copy li {
  display: grid;
  grid-template-columns: 32px minmax(0, 1fr);
  gap: 10px;
  align-items: center;
  min-height: 42px;
  padding: 8px 12px;
  border: 1px solid rgba(0, 125, 206, 0.12);
  border-radius: 12px;
  background: var(--paper-blue);
  color: var(--ink-soft);
  font-size: 14px;
}

.agent-quality-copy li b {
  color: var(--blue);
  font: 740 11px ui-monospace, SFMono-Regular, Consolas, monospace;
}

.agent-quality-copy small {
  display: block;
  margin-top: 16px;
  color: var(--muted);
  font-size: 12px;
  line-height: 1.5;
}

.agent-evidence figcaption {
  grid-template-columns: 1fr;
  padding: 12px 16px 14px;
  color: var(--muted);
  font-size: 12px;
}

.mobile-figure-summary { display: none; }

@media (max-width: 980px) {
  .chapter-divider {
    min-height: clamp(420px, 58svh, 620px);
  }
  .data-agent-panel {
    grid-template-columns: 1fr;
  }
  .agent-evidence {
    max-width: 760px;
  }
}

@media (max-width: 900px) {
  .continuity-figure,
  .city-field-figure,
  .model-figure-v3,
  .infrastructure-figure-v2 {
    overflow: visible;
    border-radius: 22px;
  }

  .continuity-figure > svg,
  .city-field-figure > svg,
  .model-figure-v3 > svg,
  .infrastructure-figure-v2 > svg {
    display: none !important;
  }

  .continuity-figure > figcaption,
  .city-field-figure > figcaption,
  .model-figure-v3 > figcaption,
  .infrastructure-figure-v2 > figcaption {
    position: static;
    width: auto;
    max-width: none;
    background: transparent;
  }

  .mobile-figure-summary {
    display: grid;
    gap: 14px;
    padding: clamp(18px, 4vw, 32px);
    background: #fffefa;
  }

  .mobile-figure-summary article {
    position: relative;
    overflow: hidden;
    padding: 20px;
    border: 1px solid rgba(20, 39, 53, 0.13);
    border-radius: 18px;
    background: #fff;
  }

  .mobile-figure-summary article > span {
    color: var(--blue);
    font: 720 12px ui-monospace, SFMono-Regular, Consolas, monospace;
  }

  .mobile-figure-summary h3 {
    margin-top: 8px;
    font-size: clamp(20px, 5vw, 27px);
    line-height: 1.12;
  }

  .mobile-figure-summary p {
    margin-top: 9px;
    color: var(--ink-soft);
    font-size: 15px;
    line-height: 1.55;
  }

  .mobile-figure-summary > i,
  .mobile-infra-pipeline > i {
    width: 2px;
    height: 18px;
    margin: -7px auto;
    background: repeating-linear-gradient(to bottom, var(--blue) 0 5px, transparent 5px 9px);
    animation: mobile-flow 1.1s linear infinite paused;
  }

  [data-flow-figure].is-flowing .mobile-figure-summary > i,
  [data-flow-figure].is-flowing .mobile-infra-pipeline > i {
    animation-play-state: running;
  }

  .mobile-warning { border-color: rgba(239, 86, 44, 0.32) !important; }
  .mobile-open { border-color: rgba(0, 125, 206, 0.34) !important; background: rgba(0, 191, 232, 0.045) !important; }

  .city-mobile { grid-template-columns: 1fr; }
  .city-mobile .mobile-metrics {
    display: grid;
    grid-column: 1 / -1;
    grid-template-columns: repeat(3, 1fr);
    gap: 8px;
  }
  .city-mobile .mobile-metrics span {
    display: grid;
    gap: 3px;
    padding: 14px 8px;
    border-radius: 14px;
    background: var(--paper-blue);
    text-align: center;
  }
  .city-mobile .mobile-metrics strong { color: var(--blue); font-size: 24px; }
  .city-mobile .mobile-metrics b { font-size: 11px; font-weight: 650; }
  .mobile-city-map {
    display: grid;
    grid-template-columns: repeat(3, minmax(0, 1fr));
    grid-template-areas:
      ". north ."
      "southwest central east"
      ". south south";
    gap: 9px;
    padding: 14px;
    border: 1px dashed rgba(0, 125, 206, 0.22);
    border-radius: 18px;
    background: rgba(245, 251, 254, 0.82);
  }
  .mobile-city-map article {
    display: grid;
    gap: 5px;
    min-width: 0;
    min-height: 92px;
    padding: 13px !important;
    border-radius: 14px;
  }
  .mobile-city-map .region-north { grid-area: north; }
  .mobile-city-map .region-southwest { grid-area: southwest; }
  .mobile-city-map .region-central { grid-area: central; }
  .mobile-city-map .region-east { grid-area: east; }
  .mobile-city-map .region-south { grid-area: south; }
  .mobile-city-map strong {
    color: var(--blue);
    font-size: 13px;
  }
  .mobile-city-map span {
    color: var(--ink-soft) !important;
    font: 560 11px/1.4 var(--body) !important;
    overflow-wrap: anywhere;
  }
  .mobile-city-tasks {
    display: grid;
    grid-template-columns: repeat(3, minmax(0, 1fr));
    gap: 10px;
  }
  .mobile-city-tasks article { padding: 0 0 16px; }
  .mobile-city-tasks article img,
  .model-mobile article img {
    display: block;
    width: 100%;
    aspect-ratio: 4 / 3;
    object-fit: cover;
  }
  .mobile-city-tasks article img {
    aspect-ratio: 16 / 9;
    background: #10212c;
    object-fit: contain;
  }
  .mobile-city-tasks article h3 { margin: 13px 14px 0; font-size: 16px; }

  .model-mobile article { padding: 0 0 18px; }
  .model-mobile article > span,
  .model-mobile article > h3,
  .model-mobile article > p { margin-left: 18px; margin-right: 18px; }
  .model-mobile article > span { display: block; margin-top: 16px; }
  .model-mobile-core { padding: 20px !important; border-color: rgba(0,125,206,.32) !important; background: var(--paper-blue) !important; }
  .model-mobile-core > span,
  .model-mobile-core > h3,
  .model-mobile-core > p { margin-left: 0 !important; margin-right: 0 !important; }

  .infrastructure-mobile { padding: 18px; }
  .mobile-infra-pipeline { display: grid; gap: 14px; }
  .mobile-infra-pipeline article { padding: 18px; }
  .mobile-infra-pipeline h3 { font-size: 21px; }
  .mobile-agent-layer { border-color: rgba(0,125,206,.34) !important; background: var(--paper-blue) !important; }
}

@media (max-width: 760px) {
  .chapter-divider {
    display: grid;
    min-height: 410px;
    padding: 86px 18px 92px;
  }
  .chapter-divider .chapter-heading {
    width: 100%;
  }
  .chapter-divider .chapter-heading h2 {
    font-size: clamp(66px, 22vw, 92px);
    line-height: .9;
  }
  .chapter-divider .chapter-subtitle {
    margin-top: 30px;
    font-size: 21px;
  }
  html[data-lang="zh"] .chapter-divider .chapter-subtitle span,
  html[data-lang="en"] .chapter-divider .chapter-subtitle span {
    white-space: normal;
  }
  html[data-lang="en"] .chapter-infrastructure .chapter-heading h2 {
    font-size: clamp(34px, 11vw, 66px);
    letter-spacing: -0.045em;
  }
  .chapter-infrastructure .chapter-subtitle {
    max-width: min(32ch, 100%);
  }
  .robopocket-hardware-stage {
    min-height: 240px;
    border-radius: 20px;
  }
  .robopocket-view-key {
    grid-template-columns: 1fr;
  }
  .city-mobile {
    grid-template-columns: 1fr;
  }
  .city-mobile .mobile-metrics {
    grid-template-columns: repeat(3, minmax(0, 1fr));
  }
  .mobile-city-tasks article h3 {
    font-size: clamp(12px, 3.7vw, 14px);
    line-height: 1.25;
    overflow-wrap: anywhere;
  }
  .mobile-infra-pipeline {
    grid-template-columns: repeat(2, minmax(0, 1fr));
    gap: 10px;
  }
  .mobile-infra-pipeline > i {
    display: none;
  }
  .mobile-infra-pipeline article {
    min-height: 118px;
    padding: 14px;
  }
  .mobile-infra-pipeline h3 {
    font-size: 17px;
    overflow-wrap: anywhere;
  }
  .mobile-infra-pipeline h3.lang-en {
    font-size: clamp(13px, 3.9vw, 16px);
  }
  .mobile-infra-pipeline p {
    font-size: 12px;
    line-height: 1.35;
  }
  .data-agent-panel {
    padding: 26px 18px;
  }
  .agent-evidence-grid {
    grid-template-columns: 1fr;
  }
  .agent-capability-panel {
    order: -1;
  }
  .agent-quality-panel {
    grid-template-columns: 1fr;
    padding: 18px;
  }
}

@media (max-width: 420px) {
  .city-mobile {
    gap: 10px;
    padding: 14px;
  }
  .city-mobile .mobile-metrics span {
    padding: 10px 5px;
  }
  .city-mobile .mobile-metrics strong {
    font-size: 22px;
  }
  .mobile-city-map {
    grid-template-columns: repeat(2, minmax(0, 1fr));
    grid-template-areas:
      "north north"
      "southwest east"
      "central central"
      "south south";
    gap: 7px;
    padding: 10px;
  }
  .mobile-city-map article {
    min-height: 64px;
    padding: 10px !important;
  }
  .mobile-city-map span {
    font-size: 10px !important;
    line-height: 1.3 !important;
  }
  .mobile-city-tasks {
    gap: 7px;
  }
  .mobile-city-tasks article {
    padding-bottom: 10px;
  }
  .mobile-city-tasks article h3 {
    margin: 9px 9px 0;
  }
  .infrastructure-mobile {
    padding: 14px;
  }
  .mobile-infra-pipeline article {
    min-height: 92px;
    padding: 10px;
  }
  .mobile-infra-pipeline h3 {
    margin-top: 5px;
  }
  .mobile-infra-pipeline p {
    margin-top: 5px;
    font-size: 11px;
  }
  .mobile-agent-layer {
    padding: 14px !important;
  }
  .mobile-agent-layer h3 {
    margin-top: 0;
    font-size: 20px;
  }
  .mobile-agent-layer p {
    margin-top: 6px;
    font-size: 13px;
    line-height: 1.4;
  }
}

@media (max-width: 599px) {
  .model-mobile article:not(.model-mobile-core) {
    display: grid;
    grid-template-columns: minmax(108px, 40%) minmax(0, 1fr);
    grid-template-rows: auto auto;
    gap: 4px 14px;
    align-items: center;
    min-height: 126px;
    padding: 12px;
  }
  .model-mobile article:not(.model-mobile-core) img {
    grid-row: 1 / 3;
    width: 100%;
    height: auto;
    min-height: 0;
    aspect-ratio: 4 / 3;
    border-radius: 12px;
  }
  .model-mobile article:not(.model-mobile-core) > span,
  .model-mobile article:not(.model-mobile-core) > h3 {
    grid-column: 2;
    margin: 0;
  }
  .model-mobile article:not(.model-mobile-core) > span {
    align-self: end;
  }
  .model-mobile article:not(.model-mobile-core) > h3 {
    align-self: start;
    font-size: clamp(16px, 4.5vw, 19px);
    overflow-wrap: anywhere;
  }
  .model-mobile-core {
    padding: 18px !important;
  }
  .model-mobile-core p {
    font-size: 14px;
  }
}

/* Tablet technical figure layouts. */
@media (min-width: 600px) and (max-width: 900px) {
  .continuity-mobile,
  .model-mobile {
    grid-template-columns: repeat(3, minmax(0, 1fr));
    align-items: stretch;
  }

  .continuity-mobile > i,
  .model-mobile > i {
    display: none;
  }

  .continuity-mobile article,
  .model-mobile article {
    min-height: 100%;
  }

  .continuity-mobile h3,
  .model-mobile h3 {
    font-size: clamp(18px, 2.5vw, 23px);
  }

  .continuity-mobile p,
  .model-mobile p {
    font-size: 13px;
    line-height: 1.45;
  }

  .mobile-city-tasks article h3 { font-size: 16px; }

  .mobile-infra-pipeline {
    grid-template-columns: repeat(4, minmax(0, 1fr));
  }

  .mobile-infra-pipeline article {
    min-height: 124px;
  }

  .mobile-infra-pipeline h3 {
    font-size: clamp(14px, 2.15vw, 17px);
    overflow-wrap: anywhere;
  }
}

/* Figure 05 responsive sequence. */
@media (max-width: 900px) {
  .mobile-infra-pipeline {
    align-items: stretch;
  }

  .mobile-infra-pipeline > i {
    display: none;
  }

  .mobile-infra-pipeline article {
    min-width: 0;
    overflow: visible;
  }

  .mobile-infra-pipeline article::after {
    position: absolute;
    z-index: 2;
    color: var(--blue);
    font: 760 13px/1 ui-monospace, SFMono-Regular, Consolas, monospace;
    text-align: center;
    pointer-events: none;
  }

  .mobile-infra-pipeline h3,
  .mobile-infra-pipeline p {
    overflow-wrap: anywhere;
  }
}

@media (min-width: 761px) and (max-width: 900px) {
  .mobile-infra-pipeline {
    grid-template-columns: repeat(4, minmax(0, 1fr));
    gap: 14px;
  }

  .mobile-infra-pipeline article:nth-of-type(1) { grid-column: 1; grid-row: 1; }
  .mobile-infra-pipeline article:nth-of-type(2) { grid-column: 2; grid-row: 1; }
  .mobile-infra-pipeline article:nth-of-type(3) { grid-column: 3; grid-row: 1; }
  .mobile-infra-pipeline article:nth-of-type(4) { grid-column: 4; grid-row: 1; }
  .mobile-infra-pipeline article:nth-of-type(5) { grid-column: 4; grid-row: 2; }
  .mobile-infra-pipeline article:nth-of-type(6) { grid-column: 3; grid-row: 2; }
  .mobile-infra-pipeline article:nth-of-type(7) { grid-column: 2; grid-row: 2; }
  .mobile-infra-pipeline article:nth-of-type(8) { grid-column: 1; grid-row: 2; }

  .mobile-infra-pipeline article:nth-of-type(1)::after,
  .mobile-infra-pipeline article:nth-of-type(2)::after,
  .mobile-infra-pipeline article:nth-of-type(3)::after {
    top: 50%;
    right: -14px;
    width: 14px;
    content: "→";
    transform: translateY(-50%);
  }

  .mobile-infra-pipeline article:nth-of-type(4)::after {
    bottom: -14px;
    left: 50%;
    width: 14px;
    height: 14px;
    content: "↓";
    line-height: 14px;
    transform: translateX(-50%);
  }

  .mobile-infra-pipeline article:nth-of-type(5)::after,
  .mobile-infra-pipeline article:nth-of-type(6)::after,
  .mobile-infra-pipeline article:nth-of-type(7)::after {
    top: 50%;
    left: -14px;
    width: 14px;
    content: "←";
    transform: translateY(-50%);
  }
}

@media (max-width: 760px) {
  .mobile-infra-pipeline {
    grid-template-columns: repeat(2, minmax(0, 1fr));
    gap: 10px;
  }

  .mobile-infra-pipeline article:nth-of-type(1) { grid-column: 1; grid-row: 1; }
  .mobile-infra-pipeline article:nth-of-type(2) { grid-column: 2; grid-row: 1; }
  .mobile-infra-pipeline article:nth-of-type(3) { grid-column: 2; grid-row: 2; }
  .mobile-infra-pipeline article:nth-of-type(4) { grid-column: 1; grid-row: 2; }
  .mobile-infra-pipeline article:nth-of-type(5) { grid-column: 1; grid-row: 3; }
  .mobile-infra-pipeline article:nth-of-type(6) { grid-column: 2; grid-row: 3; }
  .mobile-infra-pipeline article:nth-of-type(7) { grid-column: 2; grid-row: 4; }
  .mobile-infra-pipeline article:nth-of-type(8) { grid-column: 1; grid-row: 4; }

  .mobile-infra-pipeline article:nth-of-type(1)::after,
  .mobile-infra-pipeline article:nth-of-type(5)::after {
    top: 50%;
    right: -10px;
    width: 10px;
    content: "→";
    font-size: 11px;
    transform: translateY(-50%);
  }

  .mobile-infra-pipeline article:nth-of-type(2)::after,
  .mobile-infra-pipeline article:nth-of-type(4)::after,
  .mobile-infra-pipeline article:nth-of-type(6)::after {
    bottom: -10px;
    left: 50%;
    width: 10px;
    height: 10px;
    content: "↓";
    font-size: 11px;
    line-height: 10px;
    transform: translateX(-50%);
  }

  .mobile-infra-pipeline article:nth-of-type(3)::after,
  .mobile-infra-pipeline article:nth-of-type(7)::after {
    top: 50%;
    left: -10px;
    width: 10px;
    content: "←";
    font-size: 11px;
    transform: translateY(-50%);
  }
}

@keyframes mobile-flow {
  to { background-position-y: 9px; }
}

@media (prefers-reduced-motion: reduce) {
  .city-field-figure .city-edges path,
  .model-figure-v3 .model-v3-edges path,
  .infrastructure-figure-v2 .infra-v2-edges path,
  .infrastructure-figure-v2 .agent-conversation,
  .mobile-figure-summary > i,
  .mobile-infra-pipeline > i {
    animation: none !important;
  }
  .model-figure-v3 .trajectory-runner,
  .continuity-figure .trajectory-runner {
    display: none;
  }
}

/* Chapter and figure layout. */

/* Chapter numbering. */
.chapter-divider .chapter-number {
  display: inline-flex;
  gap: 16px;
  align-items: center;
  margin: 0 0 clamp(24px, 3vw, 38px);
  color: var(--blue);
  font: 760 15px/1 ui-monospace, SFMono-Regular, Consolas, monospace;
  letter-spacing: 0.16em;
}

.chapter-divider .chapter-number::after {
  width: clamp(64px, 8vw, 118px);
  height: 1px;
  background: linear-gradient(90deg, rgba(0, 125, 206, 0.72), rgba(0, 125, 206, 0.08));
  content: "";
}

/* Wide media alignment. */
.article-section > .introduction-loop,
.article-section > .continuity-figure,
.article-section > .model-figure-v3,
.article-section > .scaling-figure,
.article-section > .infrastructure-figure-v2,
.article-section > .model-demo-reel,
.article-section > .distribution-atlas {
  box-sizing: border-box;
  width: min(var(--figure-width), calc(100% + 2 * var(--gutter) - 32px));
  max-width: none;
  margin-right: 0;
  margin-left: max(
    calc((100% - var(--figure-width)) / 2),
    calc(16px - var(--gutter))
  );
  transform: none;
}

.article-section > .introduction-loop,
.article-section > .continuity-figure,
.article-section > .model-figure-v3,
.article-section > .scaling-figure,
.article-section > .infrastructure-figure-v2,
.article-section > .model-demo-reel,
.article-section > .distribution-atlas {
  margin-top: clamp(72px, 8vw, 104px);
}

.distribution-atlas > .city-field-figure {
  width: 100%;
  max-width: none;
  margin-right: 0;
  margin-left: 0;
}

.hero-media > figcaption,
.introduction-loop > figcaption,
.continuity-figure > figcaption,
.city-field-figure > figcaption,
.model-figure-v3 > figcaption,
.scaling-figure > figcaption,
.infrastructure-figure-v2 > figcaption,
.agent-evidence > figcaption {
  box-sizing: border-box;
  width: min(var(--section-title-width), calc(100% - 32px));
  max-width: none;
  margin-right: auto;
  margin-left: auto;
}

.agent-evidence > figcaption {
  grid-template-columns: minmax(0, 1fr);
}

/* Introduction loop. */
.introduction-section {
  background: linear-gradient(180deg, rgba(0, 125, 206, 0.018), rgba(0, 191, 232, 0.032));
}

.introduction-loop {
  overflow: hidden;
  border: 1px solid rgba(20, 39, 53, 0.12);
  border-radius: 30px;
  background: #fff;
  box-shadow: 0 24px 70px rgba(0, 87, 145, 0.07);
}

.introduction-loop > svg {
  display: block;
  width: 100%;
  height: auto;
  font-family: var(--body);
}

.introduction-loop .figure-paper {
  fill: #fffefa;
  stroke: rgba(20, 39, 53, 0.08);
}

.introduction-loop .figure-kicker,
.introduction-loop .node-index {
  fill: var(--blue);
  font: 760 13px ui-monospace, SFMono-Regular, Consolas, monospace;
  letter-spacing: 0.08em;
}

.introduction-loop .figure-title {
  fill: var(--ink);
  font: 660 23px var(--body);
  letter-spacing: -0.02em;
}

.introduction-loop .intro-edges path {
  fill: none;
  stroke: var(--blue);
  stroke-width: 3;
  stroke-dasharray: 10 10;
  stroke-linecap: round;
  vector-effect: non-scaling-stroke;
  animation: noe-model-flow 1.7s linear infinite paused;
}

.introduction-loop.is-flowing .intro-edges path {
  animation-play-state: running;
}

.introduction-loop .intro-node > rect {
  fill: #fff;
  stroke: rgba(20, 39, 53, 0.16);
  stroke-width: 1.5;
}

.introduction-loop .intro-data > rect {
  fill: rgba(185, 218, 25, 0.075);
  stroke: rgba(126, 149, 18, 0.28);
}

.introduction-loop .intro-model > rect {
  fill: rgba(0, 191, 232, 0.065);
  stroke: rgba(0, 125, 206, 0.25);
}

.introduction-loop .intro-infra > rect {
  fill: rgba(240, 172, 48, 0.075);
  stroke: rgba(189, 122, 8, 0.26);
}

.introduction-loop .intro-node > text:not(.node-index):not(.node-code) {
  fill: var(--ink);
  font: 680 18px var(--body);
}

.introduction-loop .intro-node .node-code {
  fill: var(--muted);
  font: 700 10px ui-monospace, SFMono-Regular, Consolas, monospace;
  letter-spacing: 0.055em;
}

.introduction-loop .intro-core circle {
  fill: var(--blue);
  stroke: rgba(255, 255, 255, 0.96);
  stroke-width: 8;
  filter: drop-shadow(0 16px 24px rgba(0, 125, 206, 0.2));
}

.introduction-loop .intro-core text {
  fill: #fff;
  font: 700 25px var(--body);
}

.introduction-loop .intro-core .mono {
  fill: rgba(255, 255, 255, 0.76);
  font: 720 10px ui-monospace, SFMono-Regular, Consolas, monospace;
  letter-spacing: 0.075em;
}

/* Figure 01 dexterity bottleneck. */
.continuity-figure .bottleneck-funnel > path {
  filter: drop-shadow(0 8px 12px rgba(239, 86, 44, 0.12));
}

.continuity-figure .bottleneck-flow {
  fill: none;
  stroke: rgba(166, 58, 34, 0.64);
  stroke-width: 2;
  stroke-dasharray: 7 7;
  stroke-linecap: round;
  vector-effect: non-scaling-stroke;
  animation: noe-model-flow 1.15s linear infinite paused;
}

.continuity-figure.is-flowing .bottleneck-flow {
  animation-play-state: running;
}

/* Figure 02 local coordinate field. */
.city-field-figure .city-coordinate-field > rect {
  fill: rgba(247, 252, 254, 0.46);
  stroke: rgba(0, 125, 206, 0.2);
  stroke-width: 1.5;
  stroke-dasharray: 6 8;
}

.city-field-figure .local-grid {
  fill: none;
  stroke: rgba(0, 125, 206, 0.06);
  stroke-width: 1;
  stroke-dasharray: 2 7;
  vector-effect: non-scaling-stroke;
}

.city-field-figure .province-boundaries path,
.mobile-province-fragments path {
  fill: none;
  stroke: rgba(0, 125, 206, 0.28);
  stroke-width: 1.35;
  stroke-linecap: round;
  stroke-linejoin: round;
  vector-effect: non-scaling-stroke;
}

.city-field-figure .city-points > g > circle:not(.city-halo) {
  fill: var(--blue);
  stroke: #fff;
  stroke-width: 2.5;
  vector-effect: non-scaling-stroke;
}

.city-field-figure .city-points > g:nth-child(4n + 2) > circle:not(.city-halo) {
  fill: #7c9512;
}

.city-field-figure .city-points > g:nth-child(4n + 3) > circle:not(.city-halo) {
  fill: #bd7a08;
}

.city-field-figure .city-points > g:nth-child(4n) > circle:not(.city-halo) {
  fill: #d9532e;
}

.city-field-figure .city-points > g > text {
  fill: var(--ink-soft);
  font: 620 11px var(--body);
}

.city-field-figure .city-points > .city-point-anchor > circle:not(.city-halo) {
  fill: var(--blue);
  stroke-width: 3;
}

.city-field-figure .city-points > .city-point-anchor > text {
  fill: var(--blue);
  font-weight: 760;
}

.city-field-figure .city-halo {
  fill: none;
  stroke: rgba(0, 125, 206, 0.34);
  stroke-width: 2;
  stroke-dasharray: 3 4;
  vector-effect: non-scaling-stroke;
}

.city-field-figure .city-anchor-dots {
  display: none;
}

.city-field-figure .city-edges path {
  vector-effect: non-scaling-stroke;
}

/* Figure 02 mobile coordinate field. */
.mobile-city-viewport {
  position: relative;
  min-height: 250px;
  overflow: hidden;
  border: 1px dashed rgba(0, 125, 206, 0.28);
  border-radius: 18px;
  background:
    linear-gradient(rgba(0, 125, 206, 0.07) 1px, transparent 1px),
    linear-gradient(90deg, rgba(0, 125, 206, 0.07) 1px, transparent 1px),
    linear-gradient(145deg, #fbfdfe, #f2f9fc);
  background-size: 42px 42px, 42px 42px, auto;
}

.mobile-city-viewport::before,
.mobile-city-viewport::after {
  position: absolute;
  z-index: 1;
  width: 72px;
  height: 72px;
  border: 1px solid rgba(0, 125, 206, 0.13);
  border-radius: 50%;
  content: "";
}

.mobile-city-viewport::before {
  top: -34px;
  left: -28px;
}

.mobile-city-viewport::after {
  right: -30px;
  bottom: -36px;
}

.mobile-city-viewport > p {
  position: relative;
  z-index: 3;
  margin: 0;
  padding: 14px 16px;
  color: var(--muted);
  font: 720 10px/1.35 ui-monospace, SFMono-Regular, Consolas, monospace;
  letter-spacing: 0.075em;
}

.mobile-province-fragments {
  position: absolute;
  inset: 0;
  z-index: 1;
  width: 100%;
  height: 100%;
}

.mobile-province-fragments path {
  stroke-width: 1.55;
}

.mobile-city-viewport .city-mobile-anchor {
  position: absolute;
  z-index: 4;
  display: inline-flex;
  gap: 7px;
  align-items: center;
  min-height: auto;
  padding: 8px 10px !important;
  border-color: rgba(0, 125, 206, 0.24);
  border-radius: 999px;
  background: rgba(255, 255, 255, 0.94);
  box-shadow: 0 9px 22px rgba(0, 87, 145, 0.1);
}

.mobile-city-viewport .city-mobile-anchor b {
  color: var(--blue);
  font: 760 10px ui-monospace, SFMono-Regular, Consolas, monospace;
}

.mobile-city-viewport .city-mobile-anchor strong {
  color: var(--ink);
  font-size: 13px;
}

.mobile-city-viewport .city-mobile-anchor-one { top: 16%; left: 9%; }
.mobile-city-viewport .city-mobile-anchor-two { top: 43%; left: 50%; }
.mobile-city-viewport .city-mobile-anchor-three { top: 55%; left: 17%; }

/* Data Agent evidence panel. */
.agent-quality-panel-single {
  grid-template-columns: minmax(0, 1fr);
  gap: 0;
  padding: clamp(20px, 3vw, 38px);
}

.agent-quality-panel-single .agent-quality-visual {
  align-self: start;
}

.agent-quality-panel-single .agent-quality-visual > span {
  display: block;
  margin-top: 12px;
  color: var(--muted);
  font-size: 12px;
  line-height: 1.45;
}

.agent-quality-panel-single .agent-quality-visual img {
  width: 100%;
  height: auto;
  object-fit: contain;
}

.scaling-mobile-summary {
  display: none;
  gap: 18px;
  padding: 22px 18px 20px;
  border-bottom: 1px solid var(--line);
  background: linear-gradient(145deg, rgba(0, 125, 206, 0.035), rgba(255, 255, 255, 0.96));
}

.scaling-mobile-kicker {
  margin: 0;
  color: var(--blue);
  font: 740 10px/1.4 ui-monospace, SFMono-Regular, Consolas, monospace;
  letter-spacing: 0.08em;
}

.scaling-mobile-runs {
  display: grid;
  grid-template-columns: repeat(3, minmax(0, 1fr));
  gap: 8px;
}

.scaling-mobile-runs article {
  display: grid;
  gap: 8px;
  min-width: 0;
  padding: 14px 10px;
  border: 1px solid rgba(20, 39, 53, 0.12);
  border-top: 3px solid var(--orange);
  border-radius: 14px;
  background: #fff;
}

.scaling-mobile-runs article:nth-child(2) {
  border-top-color: #7c9512;
}

.scaling-mobile-runs article:nth-child(3) {
  border-top-color: var(--blue);
}

.scaling-mobile-runs span,
.scaling-mobile-runs small {
  color: var(--muted);
  font: 700 9px/1.25 ui-monospace, SFMono-Regular, Consolas, monospace;
  letter-spacing: 0.04em;
}

.scaling-mobile-runs strong {
  color: var(--ink);
  font: 660 clamp(21px, 6.2vw, 30px)/1 var(--body);
  letter-spacing: -0.035em;
}

.scaling-mobile-summary > p:last-child,
.scaling-mobile-summary > p:nth-last-child(2) {
  margin: 0;
  color: var(--ink-soft);
  font-size: 13px;
  line-height: 1.6;
}

/* Outlook section. */
.outlook-section {
  background:
    radial-gradient(circle at 84% 18%, rgba(0, 191, 232, 0.08), transparent 26rem),
    linear-gradient(180deg, rgba(0, 125, 206, 0.02), rgba(255, 255, 255, 0.64));
}

html[data-lang="zh"] .outlook-intro-title-zh {
  font-size: clamp(50px, 5vw, 72px);
  line-height: 1.08;
}

.outlook-grid,
.outlook-frontiers,
.outlook-frontier-grid {
  display: grid;
  grid-template-columns: repeat(3, minmax(0, 1fr));
  gap: clamp(18px, 2.4vw, 30px);
  width: min(var(--figure-width), 100%);
  margin: clamp(72px, 8vw, 104px) auto 0;
}

.outlook-card,
.outlook-item,
.outlook-frontier,
.outlook-grid > article,
.outlook-frontiers > article,
.outlook-frontier-grid > article {
  position: relative;
  min-width: 0;
  padding: clamp(28px, 3.4vw, 46px);
  overflow: hidden;
  border: 1px solid rgba(20, 39, 53, 0.13);
  border-radius: 24px;
  background: rgba(255, 255, 255, 0.9);
  box-shadow: 0 20px 48px rgba(0, 87, 145, 0.06);
}

.outlook-card::before,
.outlook-item::before,
.outlook-frontier::before,
.outlook-grid > article::before,
.outlook-frontiers > article::before,
.outlook-frontier-grid > article::before {
  position: absolute;
  top: 0;
  right: 0;
  left: 0;
  height: 4px;
  background: var(--blue);
  content: "";
}

.outlook-card:nth-child(2)::before,
.outlook-item:nth-child(2)::before,
.outlook-frontier:nth-child(2)::before,
.outlook-grid > article:nth-child(2)::before,
.outlook-frontiers > article:nth-child(2)::before,
.outlook-frontier-grid > article:nth-child(2)::before {
  background: #7c9512;
}

.outlook-card:nth-child(3)::before,
.outlook-item:nth-child(3)::before,
.outlook-frontier:nth-child(3)::before,
.outlook-grid > article:nth-child(3)::before,
.outlook-frontiers > article:nth-child(3)::before,
.outlook-frontier-grid > article:nth-child(3)::before {
  background: var(--orange);
}

.outlook-card > span,
.outlook-item > span,
.outlook-frontier > span,
.outlook-card .outlook-index,
.outlook-item .outlook-index,
.outlook-frontier .outlook-index,
.outlook-grid > article > .outlook-code,
.outlook-frontiers > article > .outlook-code,
.outlook-frontier-grid > article > .outlook-code {
  color: var(--blue);
  font: 740 11px/1.4 ui-monospace, SFMono-Regular, Consolas, monospace;
  letter-spacing: 0.08em;
}

.outlook-card h3,
.outlook-item h3,
.outlook-frontier h3,
.outlook-grid > article h3,
.outlook-frontiers > article h3,
.outlook-frontier-grid > article h3 {
  margin-top: clamp(36px, 5vw, 58px);
  font-family: var(--display);
  font-size: clamp(29px, 2.7vw, 40px);
  font-weight: 470;
  letter-spacing: -0.035em;
  line-height: 1.12;
}

.outlook-card p,
.outlook-item p,
.outlook-frontier p,
.outlook-grid > article p,
.outlook-frontiers > article p,
.outlook-frontier-grid > article p {
  margin-top: 18px;
  color: var(--ink-soft);
  line-height: 1.72;
}

.outlook-statement,
.outlook-final,
.outlook-conclusion {
  width: min(940px, 100%);
  margin: clamp(72px, 9vw, 118px) auto 0;
  padding: clamp(36px, 5vw, 64px);
  border: 1px solid rgba(0, 125, 206, 0.18);
  border-radius: 28px;
  background: linear-gradient(120deg, rgba(0, 191, 232, 0.09), #fff 62%, rgba(0, 125, 206, 0.055));
  font-family: var(--display);
  font-size: clamp(36px, 4.2vw, 58px);
  font-weight: 450;
  letter-spacing: -0.04em;
  line-height: 1.18;
}

.outlook-vision {
  width: min(1120px, 100%);
  margin: clamp(86px, 10vw, 136px) auto 0;
  padding: 0 clamp(8px, 1.2vw, 18px);
  text-align: center;
}

.outlook-vision > h3 {
  margin: 0;
  color: var(--ink);
  font-family: var(--display);
  font-weight: 450;
  letter-spacing: -0.035em;
  line-height: 1.42;
}

.outlook-vision-lead,
.outlook-vision-body {
  display: block;
}

.outlook-vision-lead {
  font-size: clamp(38px, 4.3vw, 64px);
  line-height: 1.32;
}

.outlook-vision-body {
  margin-top: clamp(18px, 2.4vw, 30px);
  color: var(--ink-soft);
  font-size: clamp(24px, 2.35vw, 34px);
  line-height: 1.58;
}

html[data-lang="zh"] .outlook-vision-body + .outlook-vision-lead {
  margin-top: clamp(24px, 3vw, 42px);
}

@media (max-width: 1180px) {
  .article-section > .introduction-loop,
  .article-section > .continuity-figure,
  .article-section > .model-figure-v3,
  .article-section > .scaling-figure,
  .article-section > .infrastructure-figure-v2,
  .article-section > .model-demo-reel,
  .article-section > .distribution-atlas {
    width: min(var(--figure-width), calc(100% + 2 * var(--gutter) - 32px));
  }
}

@media (max-width: 980px) {
  .agent-quality-panel-single {
    grid-template-columns: minmax(0, 1fr);
  }
}

@media (max-width: 900px) {
  .scaling-figure > .figure-header,
  .scaling-figure > svg {
    display: none !important;
  }

  .scaling-mobile-summary {
    display: grid;
  }

  .introduction-loop {
    overflow: visible;
    border-radius: 22px;
  }

  .introduction-loop > svg {
    display: none !important;
  }

  .introduction-loop > figcaption {
    position: static;
    width: auto;
    max-width: none;
    background: transparent;
  }

  .introduction-mobile {
    grid-template-columns: 1fr;
  }

  .mobile-city-viewport {
    min-height: 230px;
  }

  .outlook-grid,
  .outlook-frontiers,
  .outlook-frontier-grid {
    gap: 14px;
  }

  .model-demo-copy {
    grid-template-columns: minmax(0, 1fr);
  }

  .outlook-card,
  .outlook-item,
  .outlook-frontier,
  .outlook-grid > article,
  .outlook-frontiers > article,
  .outlook-frontier-grid > article {
    padding: 26px 22px;
  }
}

@media (max-width: 760px) {
  .chapter-divider .chapter-number {
    margin-bottom: 22px;
    font-size: 13px;
  }

  html[data-lang="en"] .chapter-introduction .chapter-heading h2 {
    font-size: clamp(44px, 15vw, 64px);
    letter-spacing: -0.055em;
  }

  .article-section > .introduction-loop,
  .article-section > .continuity-figure,
  .article-section > .model-figure-v3,
  .article-section > .scaling-figure,
  .article-section > .infrastructure-figure-v2,
  .article-section > .model-demo-reel,
  .article-section > .distribution-atlas {
    width: 100%;
    margin-right: 0;
    margin-left: 0;
    transform: none;
  }

  .introduction-loop > figcaption,
  .continuity-figure > figcaption,
  .city-field-figure > figcaption,
  .model-figure-v3 > figcaption,
  .scaling-figure > figcaption,
  .infrastructure-figure-v2 > figcaption,
  .agent-evidence > figcaption {
    grid-template-columns: minmax(0, 1fr);
    gap: 6px;
    width: 100%;
    margin-right: 0;
    margin-left: 0;
  }

  .agent-quality-panel-single {
    grid-template-columns: 1fr;
    padding: 0;
  }

  .agent-evidence-grid {
    padding: 0;
  }

  .agent-quality-visual img {
    border-radius: 0;
    box-shadow: none;
  }

  .model-demo-reel {
    padding: 18px;
    border-radius: 22px;
  }

  .model-demo-grid {
    grid-template-columns: minmax(0, 1fr);
  }

  .outlook-grid,
  .outlook-frontiers,
  .outlook-frontier-grid {
    grid-template-columns: 1fr;
    margin-top: 62px;
  }

  .outlook-card h3,
  .outlook-item h3,
  .outlook-frontier h3,
  .outlook-grid > article h3,
  .outlook-frontiers > article h3,
  .outlook-frontier-grid > article h3 {
    margin-top: 30px;
    font-size: clamp(29px, 8vw, 38px);
  }

  html[data-lang="zh"] .outlook-intro-title-zh {
    font-size: clamp(36px, 10vw, 46px);
    line-height: 1.12;
  }
}

@media (max-width: 599px) {
  .introduction-mobile article {
    min-height: 0;
  }

  .mobile-city-viewport {
    min-height: 218px;
  }

  .mobile-city-viewport .city-mobile-anchor-one { top: 16%; left: 8%; }
  .mobile-city-viewport .city-mobile-anchor-two { top: 43%; left: 48%; }
  .mobile-city-viewport .city-mobile-anchor-three { top: 55%; left: 16%; }
}

@media (max-width: 420px) {
  .mobile-city-viewport {
    min-height: 206px;
  }

  .mobile-city-viewport > p {
    padding: 12px;
    font-size: 9px;
  }

  .mobile-city-viewport .city-mobile-anchor {
    gap: 5px;
    padding: 7px 8px !important;
  }

  .mobile-city-viewport .city-mobile-anchor strong {
    font-size: 12px;
  }

  .mobile-city-viewport .city-mobile-anchor-one { left: 6%; }
  .mobile-city-viewport .city-mobile-anchor-two { left: 44%; }
  .mobile-city-viewport .city-mobile-anchor-three { left: 12%; }

  .outlook-card,
  .outlook-item,
  .outlook-frontier,
  .outlook-grid > article,
  .outlook-frontiers > article,
  .outlook-frontier-grid > article {
    padding: 24px 20px;
    border-radius: 20px;
  }

  .outlook-statement,
  .outlook-final,
  .outlook-conclusion {
    padding: 30px 22px;
    border-radius: 22px;
    font-size: clamp(32px, 9vw, 42px);
  }

  .outlook-vision {
    margin-top: 72px;
    padding: 0;
  }

  .outlook-vision > h3 {
    line-height: 1.48;
  }

  .outlook-vision-lead {
    font-size: clamp(32px, 9vw, 42px);
  }

  .outlook-vision-body {
    font-size: clamp(22px, 6vw, 30px);
    line-height: 1.6;
  }
}

@media (min-width: 600px) and (max-width: 900px) {
  .introduction-mobile {
    grid-template-columns: repeat(3, minmax(0, 1fr));
    align-items: stretch;
  }

  .introduction-mobile > i {
    display: none;
  }

  .introduction-mobile article {
    min-height: 100%;
  }

  .introduction-mobile h3 {
    font-size: clamp(18px, 2.5vw, 23px);
  }

  .introduction-mobile p {
    font-size: 13px;
    line-height: 1.45;
  }
}

@media (prefers-reduced-motion: reduce) {
  .introduction-loop .intro-edges path,
  .continuity-figure .bottleneck-flow {
    animation: none !important;
  }
}

main,
.site-footer {
  margin-left: 0;
  padding-left: var(--toc-rail);
}

.hero-media > figcaption,
.introduction-loop > figcaption,
.continuity-figure > figcaption,
.city-field-figure > figcaption,
.model-figure-v3 > figcaption,
.scaling-figure > figcaption,
.infrastructure-figure-v2 > figcaption,
.agent-evidence > figcaption {
  padding-top: 18px;
  padding-bottom: 26px;
}

@media (max-width: 760px) {
  .hero-media > figcaption,
  .introduction-loop > figcaption,
  .continuity-figure > figcaption,
  .city-field-figure > figcaption,
  .model-figure-v3 > figcaption,
  .scaling-figure > figcaption,
  .infrastructure-figure-v2 > figcaption,
  .agent-evidence > figcaption {
    padding-top: 14px;
    padding-bottom: 22px;
  }

  .model-insight {
    padding: 30px 22px;
    border-radius: 22px;
  }

  .model-insight h3 {
    max-width: none;
    font-size: clamp(31px, 9vw, 42px);
  }

  .model-insight > p:last-child {
    font-size: 16px;
    line-height: 1.72;
  }
}

/* Figure 01 editorial finish. */
.continuity-figure .conventional-trajectory > rect:first-child {
  fill: url(#lane-warm);
  stroke: rgba(208, 127, 36, 0.22);
}

.continuity-figure .noe-trajectory > rect:first-child {
  fill: url(#lane-cool);
  stroke: rgba(0, 125, 206, 0.2);
}

.continuity-figure .lane-grid {
  fill: url(#continuity-grid) !important;
  stroke: none !important;
  opacity: 0.75;
}

.continuity-figure .lane-chip {
  fill: rgba(240, 172, 48, 0.14) !important;
  stroke: rgba(221, 126, 32, 0.24) !important;
}

.continuity-figure .noe-trajectory .lane-chip {
  fill: rgba(0, 125, 206, 0.11) !important;
  stroke: rgba(0, 125, 206, 0.22) !important;
}

.continuity-figure .lane-eyebrow {
  text-anchor: middle;
}

.continuity-figure .conventional-trajectory .lane-eyebrow {
  fill: #a84b23;
}

.continuity-figure .knowledge-cluster .motion-orb {
  fill: url(#motion-orb);
  stroke: rgba(0, 125, 206, 0.16);
  stroke-width: 1.2;
  filter: drop-shadow(0 10px 18px rgba(0, 87, 145, 0.08));
}

.continuity-figure .knowledge-cluster .motion-label-plate {
  fill: rgba(255, 255, 255, 0.9);
  stroke: rgba(0, 125, 206, 0.16);
  stroke-width: 1;
}

.continuity-figure .knowledge-cluster circle:not(.motion-orb) {
  fill: rgba(0, 191, 232, 0.3);
  stroke: rgba(0, 125, 206, 0.58);
  stroke-width: 1.2;
}

.continuity-figure .knowledge-cluster circle:nth-of-type(3n + 2):not(.motion-orb) {
  fill: rgba(185, 218, 25, 0.34);
  stroke: rgba(112, 137, 12, 0.68);
}

.continuity-figure .knowledge-cluster circle:nth-of-type(3n):not(.motion-orb) {
  fill: rgba(240, 172, 48, 0.3);
  stroke: rgba(201, 120, 20, 0.62);
}

.continuity-figure .knowledge-cluster circle:nth-of-type(5n):not(.motion-orb) {
  fill: rgba(239, 86, 44, 0.22);
  stroke: rgba(204, 70, 36, 0.58);
}

.continuity-figure .distribution-streams path,
.continuity-figure .bottleneck-streams path,
.continuity-figure .continuity-waves path {
  fill: none;
  stroke-width: 2;
  stroke-linecap: round;
  vector-effect: non-scaling-stroke;
}

.continuity-figure .stream-green { stroke: rgba(122, 152, 13, 0.72); }
.continuity-figure .stream-yellow { stroke: rgba(220, 145, 28, 0.72); }
.continuity-figure .stream-blue { stroke: rgba(0, 125, 206, 0.72); }
.continuity-figure .stream-orange { stroke: rgba(220, 77, 40, 0.72); }

.continuity-figure .distribution-streams path:not(:nth-child(3)) {
  opacity: 0.68;
}

.continuity-figure .stage-stack rect {
  fill: rgba(0, 191, 232, 0.06);
  stroke: rgba(0, 125, 206, 0.13);
  stroke-width: 1;
}

.continuity-figure .stage-stack-open rect {
  fill: rgba(0, 125, 206, 0.07);
  stroke: rgba(0, 125, 206, 0.17);
}

.continuity-figure .stage-card rect,
.continuity-figure .trajectory-card > rect:first-child {
  fill: rgba(255, 255, 255, 0.96);
  filter: drop-shadow(0 10px 18px rgba(20, 39, 53, 0.06));
}

.continuity-figure .bottleneck-funnel > path {
  stroke-width: 1.8;
}

.continuity-figure .bottleneck-streams .bottleneck-flow {
  stroke-width: 2.2;
  stroke-dasharray: 7 7;
}

.continuity-figure .trajectory-grid {
  fill: url(#continuity-grid) !important;
  stroke: none !important;
  filter: none !important;
  opacity: 0.72;
}

.continuity-figure .trajectory-card > polyline,
.continuity-figure .trajectory-card-smooth > path {
  filter: drop-shadow(0 4px 6px rgba(239, 86, 44, 0.11));
}

.continuity-figure .trajectory-card-smooth > path {
  filter: drop-shadow(0 4px 7px rgba(0, 125, 206, 0.14));
}

.continuity-figure .trajectory-target circle {
  fill: none;
  stroke: rgba(239, 86, 44, 0.18);
  stroke-width: 2;
}

.continuity-figure .trajectory-card-smooth .trajectory-target circle {
  stroke: rgba(0, 125, 206, 0.2);
}

.continuity-figure .continuity-gate > rect:first-child {
  fill: url(#continuity-fill);
  stroke: rgba(0, 125, 206, 0.56);
  filter: drop-shadow(0 10px 18px rgba(0, 125, 206, 0.09));
}

.continuity-figure .continuity-waves path {
  stroke-width: 1.7;
  opacity: 0.6;
}

.continuity-figure .continuity-gate .gate-label-plate {
  fill: rgba(255, 255, 255, 0.9);
  stroke: rgba(0, 125, 206, 0.15);
  stroke-width: 1;
  filter: none;
}

.continuity-figure .figure-paper {
  stroke: none;
}

.continuity-figure .funnel-label {
  font-size: 11.5px;
}

.continuity-figure .trajectory-emphasis {
  fill: var(--orange);
  stroke: #fff;
  stroke-width: 2.5;
  filter: drop-shadow(0 3px 5px rgba(239, 86, 44, 0.24));
}

.continuity-figure > figcaption {
  width: min(980px, calc(100% - 32px));
}

.continuity-figure > figcaption > span:not(.figure-number) {
  text-wrap: pretty;
}

.continuity-figure > .continuity-compact-svg {
  display: none;
  width: 100%;
  height: auto;
  font-family: var(--body);
}

.continuity-compact-svg .compact-paper {
  fill: #fffefa;
}

.continuity-tablet-svg .compact-lane > rect:first-child {
  stroke-width: 1.2;
}

.continuity-tablet-svg .compact-lane-warm > rect:first-child {
  fill: #fffbf2;
  stroke: rgba(208, 127, 36, 0.24);
}

.continuity-tablet-svg .compact-lane-cool > rect:first-child {
  fill: #f5fbfe;
  stroke: rgba(0, 125, 206, 0.22);
}

.continuity-tablet-svg .compact-chip {
  fill: rgba(240, 172, 48, 0.13);
  stroke: rgba(208, 127, 36, 0.2);
}

.continuity-tablet-svg .compact-lane-cool .compact-chip {
  fill: rgba(0, 125, 206, 0.1);
  stroke: rgba(0, 125, 206, 0.2);
}

.continuity-compact-svg .compact-title {
  fill: #a84b23;
  font: 720 12.5px ui-monospace, SFMono-Regular, Consolas, monospace;
  letter-spacing: 0.025em;
  text-anchor: middle;
}

.continuity-compact-svg .compact-lane-cool .compact-title {
  fill: var(--blue);
}

.continuity-compact-svg .compact-distribution .compact-orb,
.continuity-compact-svg .phone-distribution .compact-orb {
  fill: rgba(255, 255, 255, 0.92);
  stroke: rgba(0, 125, 206, 0.18);
  stroke-width: 1.2;
}

.continuity-compact-svg .compact-distribution circle:not(.compact-orb),
.continuity-compact-svg .phone-distribution circle:not(.compact-orb) {
  fill: rgba(0, 191, 232, 0.28);
  stroke: rgba(0, 125, 206, 0.56);
  stroke-width: 1;
}

.continuity-compact-svg .compact-distribution circle:nth-of-type(3n + 2):not(.compact-orb),
.continuity-compact-svg .phone-distribution circle:nth-of-type(3n + 2):not(.compact-orb) {
  fill: rgba(185, 218, 25, 0.32);
  stroke: rgba(112, 137, 12, 0.62);
}

.continuity-compact-svg .compact-distribution circle:nth-of-type(3n):not(.compact-orb),
.continuity-compact-svg .phone-distribution circle:nth-of-type(3n):not(.compact-orb) {
  fill: rgba(240, 172, 48, 0.3);
  stroke: rgba(201, 120, 20, 0.6);
}

.continuity-compact-svg .compact-label,
.continuity-compact-svg .phone-label {
  fill: var(--muted);
  font: 690 12px ui-monospace, SFMono-Regular, Consolas, monospace;
  letter-spacing: 0.015em;
  text-anchor: middle;
}

.continuity-compact-svg .compact-arrow,
.continuity-compact-svg .phone-arrow {
  fill: none;
  stroke-width: 1.8;
  stroke-linecap: round;
  vector-effect: non-scaling-stroke;
}

.continuity-compact-svg .neutral { stroke: #687d88; }
.continuity-compact-svg .orange { stroke: #d94d28; }
.continuity-compact-svg .blue { stroke: var(--blue); }

.continuity-compact-svg .compact-stage rect,
.continuity-compact-svg .phone-stage rect,
.continuity-compact-svg .compact-trajectory rect,
.continuity-compact-svg .phone-trajectory rect {
  fill: rgba(255, 255, 255, 0.96);
  stroke: rgba(20, 39, 53, 0.16);
  stroke-width: 1.2;
}

.continuity-compact-svg .compact-stage > text,
.continuity-compact-svg .phone-stage > text {
  fill: var(--ink);
  font: 680 14px var(--body);
  text-anchor: middle;
}

.continuity-compact-svg .compact-stage .compact-note,
.continuity-compact-svg .phone-stage .phone-note {
  fill: var(--muted);
  font: 650 10.5px ui-monospace, SFMono-Regular, Consolas, monospace;
}

.continuity-compact-svg .compact-bottleneck > path:first-child,
.continuity-compact-svg .phone-bottleneck > path:first-child {
  fill: rgba(239, 86, 44, 0.14);
  stroke: #e46642;
  stroke-width: 1.5;
}

.continuity-compact-svg .compact-bottleneck > path:not(:first-child),
.continuity-compact-svg .phone-bottleneck > path:not(:first-child) {
  fill: none;
  stroke: #d94d28;
  stroke-width: 1.8;
  stroke-dasharray: 6 6;
}

.continuity-compact-svg .compact-bottleneck text {
  fill: #a63a22;
  font: 760 12px ui-monospace, SFMono-Regular, Consolas, monospace;
  letter-spacing: 0.015em;
  text-anchor: middle;
}

.continuity-compact-svg .compact-continuity > rect:first-child,
.continuity-compact-svg .phone-continuity > rect:first-child {
  fill: rgba(0, 191, 232, 0.12);
  stroke: rgba(0, 125, 206, 0.62);
  stroke-width: 1.5;
}

.continuity-compact-svg .compact-continuity > path,
.continuity-compact-svg .phone-continuity > path {
  fill: none;
  stroke: rgba(0, 125, 206, 0.46);
  stroke-width: 1.4;
}

.continuity-compact-svg .compact-continuity .compact-gate-plate {
  fill: rgba(255, 255, 255, 0.9);
  stroke: rgba(0, 125, 206, 0.14);
  stroke-width: 1;
}

.continuity-compact-svg .compact-continuity > text,
.continuity-compact-svg .phone-continuity > text {
  fill: var(--ink);
  font: 660 13px var(--body);
  text-anchor: middle;
}

.continuity-compact-svg .compact-continuity .compact-main,
.continuity-compact-svg .phone-continuity .phone-main {
  fill: var(--blue);
  font-weight: 780;
}

.continuity-compact-svg .compact-trajectory > text {
  fill: var(--ink);
  font: 650 12.5px var(--body);
}

.continuity-compact-svg .compact-trajectory > polyline,
.continuity-compact-svg .compact-trajectory > path,
.continuity-compact-svg .phone-trajectory > polyline,
.continuity-compact-svg .phone-trajectory > path {
  fill: none;
  stroke: var(--orange);
  stroke-width: 3;
  stroke-linecap: round;
  stroke-linejoin: round;
  vector-effect: non-scaling-stroke;
}

.continuity-compact-svg .compact-smooth > path,
.continuity-compact-svg .phone-smooth > path {
  stroke: var(--blue);
}

.continuity-compact-svg .compact-trajectory > circle,
.continuity-compact-svg .phone-trajectory > circle {
  fill: #fff;
  stroke: var(--orange);
  stroke-width: 1.7;
}

.continuity-compact-svg .compact-smooth > circle,
.continuity-compact-svg .phone-smooth > circle {
  stroke: var(--blue);
}

.continuity-phone-svg .phone-lane > rect:first-child {
  stroke-width: 1.2;
}

.continuity-phone-svg .phone-lane-warm > rect:first-child {
  fill: #fffbf2;
  stroke: rgba(208, 127, 36, 0.24);
}

.continuity-phone-svg .phone-lane-cool > rect:first-child {
  fill: #f5fbfe;
  stroke: rgba(0, 125, 206, 0.22);
}

.continuity-phone-svg .phone-chip {
  fill: rgba(240, 172, 48, 0.13);
  stroke: rgba(208, 127, 36, 0.2);
}

.continuity-phone-svg .phone-lane-cool .phone-chip {
  fill: rgba(0, 125, 206, 0.1);
  stroke: rgba(0, 125, 206, 0.2);
}

.continuity-phone-svg .phone-title {
  fill: #a84b23;
  font: 720 11.5px ui-monospace, SFMono-Regular, Consolas, monospace;
  letter-spacing: 0.012em;
  text-anchor: middle;
}

.continuity-phone-svg .phone-lane-cool .phone-title {
  fill: var(--blue);
}

.continuity-phone-svg .phone-label {
  font-size: 11.5px;
}

.continuity-phone-svg .phone-conclusion {
  fill: var(--muted);
  font: 600 13px var(--body);
}

.continuity-phone-svg .phone-gate-plate {
  fill: rgba(255, 255, 255, 0.9);
  stroke: rgba(0, 125, 206, 0.14);
  stroke-width: 1;
}

@media (max-width: 900px) {
  .continuity-figure > .continuity-tablet-svg {
    display: none !important;
  }

  .continuity-figure > .continuity-phone-svg {
    display: block !important;
    width: min(100%, 520px);
    margin-right: auto;
    margin-left: auto;
  }

  .continuity-figure > figcaption {
    width: 100%;
  }

  .agent-evidence-grid {
    padding: 0;
  }

  .agent-quality-visual img {
    border-radius: 0;
    box-shadow: none;
  }
}

@media (max-width: 600px) {
  .continuity-figure > .continuity-tablet-svg {
    display: none !important;
  }

  .continuity-figure > .continuity-phone-svg {
    display: block !important;
  }
}

html[data-lang="en"] .outlook-card h3,
html[data-lang="en"] .outlook-item h3,
html[data-lang="en"] .outlook-frontier h3,
html[data-lang="en"] .outlook-grid > article h3,
html[data-lang="en"] .outlook-frontiers > article h3,
html[data-lang="en"] .outlook-frontier-grid > article h3 {
  font-size: clamp(26px, 2.25vw, 32px);
  line-height: 1.12;
  overflow-wrap: anywhere;
}

/* Figure numbering and collision-safe caption/label finish. */
.hero-media > .teaser-caption {
  grid-template-columns: minmax(0, 1fr);
}

.introduction-loop .intro-data > rect {
  fill: #fbfcec;
}

.introduction-loop .intro-model > rect {
  fill: #f1fafc;
}

.introduction-loop .intro-infra > rect {
  fill: #fff9ef;
}

.continuity-figure .trajectory-emphasis,
.continuity-compact-svg .trajectory-emphasis {
  paint-order: stroke fill;
  stroke: #fff;
  stroke-width: 7px;
  stroke-linejoin: round;
}

.agent-evidence > figcaption {
  grid-template-columns: 106px minmax(0, 1fr);
  gap: 18px;
  padding: 17px 18px 20px;
  font-size: 15px;
  line-height: 1.58;
}

@media (max-width: 900px) {
  .agent-evidence > figcaption {
    grid-template-columns: minmax(0, 1fr);
    gap: 6px;
    width: 100%;
    margin-right: 0;
    margin-left: 0;
    padding: 14px 16px 22px;
    font-size: 13px;
    line-height: 1.48;
  }
}

/* Goal-wide acceptance finish: make Figure 01's phone variant legible at its
   actual rendered size, and keep Figure 02 task labels as whole words. */
.continuity-phone-svg .phone-title {
  font-size: 15.5px;
  letter-spacing: 0.005em;
}

.continuity-phone-svg .phone-stage > text {
  font-size: 15.5px;
}

.continuity-phone-svg .phone-stage .phone-note {
  font-size: 12.5px;
}

.continuity-phone-svg .phone-continuity > text {
  font-size: 14px;
}

.continuity-phone-svg .phone-label-essential {
  fill: var(--ink-soft);
  font-size: 15px;
  font-weight: 760;
  letter-spacing: 0;
}

.continuity-phone-svg .phone-conclusion {
  font-size: 15.5px;
  line-height: 1.2;
}

@media (max-width: 420px) {
  .continuity-figure {
    width: calc(100% + 20px);
    max-width: none;
    margin-right: -10px;
    margin-left: -10px;
  }

  .mobile-city-tasks {
    grid-template-columns: minmax(0, 1fr);
    gap: 8px;
  }

  .mobile-city-tasks article {
    display: grid;
    grid-template-columns: clamp(104px, 32vw, 120px) minmax(0, 1fr);
    align-items: center;
    min-height: 68px;
    padding: 0;
    overflow: hidden;
  }

  .mobile-city-tasks article img {
    width: 100%;
    height: clamp(68px, 21vw, 82px);
    aspect-ratio: auto;
    object-fit: contain;
  }

  .mobile-city-tasks article h3 {
    margin: 0 14px;
    font-size: 15px;
    line-height: 1.25;
    overflow-wrap: normal;
    word-break: normal;
    hyphens: none;
  }
}

/* Figure 06 language-native typesetting finish.
   The screenshot keeps its own natural ratio; the single outer Figure frame
   gains a restrained top/side gutter, and narrow screens no longer shrink the
   complete interface to illegible micro type merely to satisfy viewport
   height. */
.agent-evidence-grid {
  padding: 18px 22px 0;
}

.agent-evidence > figcaption {
  padding: 18px 22px 26px;
}

@media (min-width: 600px) and (max-width: 900px) {
  .agent-evidence {
    width: min(760px, calc(100% - 32px));
  }

  .agent-evidence-grid {
    padding: 12px 14px 0;
  }

  .agent-evidence > figcaption {
    padding: 14px 16px 22px;
  }
}

/* Editorial line-ending control.
   Body copy gets a slightly more deliberate final line, while display text
   redistributes its words across lines. Language-specific breaking rules keep
   Chinese phrases together and prevent English words from being split merely
   to fill a narrow measure. */
main p,
main li,
main figcaption > span:not(.figure-number) {
  text-wrap: pretty;
}

main h1,
main h2,
main h3 {
  text-wrap: balance;
}

.keep-tail {
  white-space: nowrap;
}

.typographic-tail {
  display: inline !important;
  white-space: nowrap;
}

html[data-lang="en"] main :is(p, li, h1, h2, h3, figcaption) {
  overflow-wrap: normal !important;
  word-break: normal !important;
  hyphens: none;
}

html[data-lang="zh"] main :is(p, li, h1, h2, h3, figcaption) {
  line-break: strict;
  overflow-wrap: normal !important;
}

@supports (word-break: auto-phrase) {
  html[data-lang="zh"] main :is(p, li, h1, h2, h3, figcaption) {
    word-break: auto-phrase !important;
  }
}

@media (min-width: 600px) and (max-width: 767px) {
  .agent-evidence {
    width: min(430px, calc(100% - 32px));
  }
}

@media (max-width: 599px) {
  .agent-evidence {
    width: min(430px, calc(100% + 20px));
    max-width: none;
    margin-right: -10px;
    margin-left: -10px;
  }

  .agent-evidence-grid {
    padding: 10px 12px 0;
  }

  .agent-evidence > figcaption {
    padding: 14px 16px 22px;
  }
}

/* Apple China-inspired Chinese reading rhythm.
   Keep the English article on its editorial serif/sans pairing, while Chinese
   uses the platform Chinese UI stack, tight headline leading, and neutral
   letter spacing. */
html[data-lang="zh"] {
  --display:
    "SF Pro SC", "SF Pro Display", "PingFang SC", "Hiragino Sans GB",
    "Noto Sans SC Variable", "Microsoft YaHei", sans-serif;
  --body:
    "SF Pro SC", "SF Pro Text", "PingFang SC", "Hiragino Sans GB",
    "Noto Sans SC Variable", "Microsoft YaHei", sans-serif;
}

html[data-lang="zh"] body {
  font-family: var(--body);
  letter-spacing: 0;
  line-height: 1.58;
}

html[data-lang="zh"] h1,
html[data-lang="zh"] h2,
html[data-lang="zh"] h3,
html[data-lang="zh"] p,
html[data-lang="zh"] figcaption,
html[data-lang="zh"] .article-meta strong,
html[data-lang="zh"] .toc-main,
html[data-lang="zh"] .toc-sub a,
html[data-lang="zh"] .mobile-menu a {
  letter-spacing: 0;
}

html[data-lang="zh"] .article-hero h1 {
  font-weight: 600;
  font-variation-settings: "wght" 600;
  letter-spacing: 0;
  line-height: 1.06;
}

html[data-lang="zh"] .hero-thesis,
html[data-lang="zh"] .chapter-divider .chapter-heading h2,
html[data-lang="zh"] .section-intro h2,
html[data-lang="zh"] .task-landscape-head h2,
html[data-lang="zh"] .capture-copy h3,
html[data-lang="zh"] .distribution-atlas .field-copy h3,
html[data-lang="zh"] .model-insight h3,
html[data-lang="zh"] .model-demo-copy h3,
html[data-lang="zh"] .data-agent-copy h3,
html[data-lang="zh"] .outlook-grid > article h3,
html[data-lang="zh"] .outlook-frontier-grid > article h3,
html[data-lang="zh"] .outlook-vision > h3,
html[data-lang="zh"] .closing h2 {
  font-family: var(--display);
  font-weight: 600;
  font-variation-settings: "wght" 600;
  letter-spacing: 0;
}

html[data-lang="zh"] .hero-thesis {
  line-height: 1.12;
}

html[data-lang="zh"] .chapter-divider .chapter-heading h2 {
  line-height: 0.98;
}

html[data-lang="zh"] .chapter-divider .chapter-subtitle {
  font-weight: 500;
  letter-spacing: 0;
  line-height: 1.22;
}

html[data-lang="zh"] .section-intro h2,
html[data-lang="zh"] .task-landscape-head h2,
html[data-lang="zh"] .capture-copy h3,
html[data-lang="zh"] .distribution-atlas .field-copy h3,
html[data-lang="zh"] .model-insight h3,
html[data-lang="zh"] .model-demo-copy h3,
html[data-lang="zh"] .data-agent-copy h3 {
  line-height: 1.08;
}

html[data-lang="zh"] .principle-grid h3,
html[data-lang="zh"] .engine-principles h3,
html[data-lang="zh"] .protocol-grid h3,
html[data-lang="zh"] .outlook-grid > article h3,
html[data-lang="zh"] .outlook-frontier-grid > article h3 {
  font-weight: 600;
  letter-spacing: 0;
  line-height: 1.14;
}

html[data-lang="zh"] .dek,
html[data-lang="zh"] .section-intro p,
html[data-lang="zh"] .editorial-copy p,
html[data-lang="zh"] .model-insight > p:last-child,
html[data-lang="zh"] .task-landscape-head div > p,
html[data-lang="zh"] .capture-copy > p,
html[data-lang="zh"] .distribution-atlas .field-copy > p:not(.overline),
html[data-lang="zh"] .data-agent-copy > p,
html[data-lang="zh"] .principle-grid p,
html[data-lang="zh"] .engine-principles p,
html[data-lang="zh"] .protocol-grid p,
html[data-lang="zh"] .outlook-grid > article p,
html[data-lang="zh"] .outlook-frontier-grid > article p {
  font-weight: 400;
  letter-spacing: 0;
  line-height: 1.62;
}

html[data-lang="zh"] .article-meta div > span,
html[data-lang="zh"] .section-index,
html[data-lang="zh"] .edition,
html[data-lang="zh"] .model-demo-copy p,
html[data-lang="zh"] .model-demo-card figcaption {
  letter-spacing: 0.02em;
}

html[data-lang="zh"] figcaption {
  line-height: 1.5;
}

/* DM3 cumulative data growth */
#distribution {
  display: flex;
  flex-direction: column;
  padding-bottom: clamp(52px, 5vw, 72px);
}

#distribution > .section-index,
#distribution > .editorial-copy { order: 0; }
#distribution > .distribution-layout { order: 1; }
#distribution > .metric-strip { order: 2; }
#distribution > .data-growth-figure {
  order: 3;
  margin-bottom: 24px;
}

#distribution + #tasks {
  margin-top: clamp(52px, 5vw, 72px);
}

.data-growth-figure {
  position: relative;
  width: min(var(--figure-width), calc(100% + 2 * var(--gutter) - 32px));
  max-width: none;
  margin: clamp(78px, 8vw, 104px) 0 clamp(56px, 8vw, 104px)
    max(calc((100% - var(--figure-width)) / 2), calc(16px - var(--gutter)));
  overflow: visible;
  border: 1px solid var(--line);
  border-radius: 34px;
  background: var(--paper);
  box-shadow: 0 18px 50px rgba(24, 36, 45, 0.06);
}

.data-growth-figure::before {
  position: absolute;
  top: -46px;
  left: 0;
  z-index: 3;
  padding: 7px 12px;
  border: 1px solid rgba(0, 125, 206, 0.24);
  border-radius: 999px;
  background: rgba(var(--paper-rgb), 0.9);
  color: var(--blue);
  font-size: 12px;
  font-weight: 700;
  letter-spacing: 0.12em;
  backdrop-filter: blur(8px);
}

html[data-lang="en"] .data-growth-figure::before { content: "DATA SCALE"; }
html[data-lang="zh"] .data-growth-figure::before { content: "数据规模"; }

.data-growth-header {
  border-radius: 34px 34px 0 0;
}

.data-growth-figure > svg {
  display: block;
  width: 100%;
  height: auto;
  padding: 16px 18px 0;
}

.data-growth-paper {
  fill: #fff;
}

.data-growth-heading {
  fill: #142735;
  font-family: var(--font-mono);
  font-size: 24px;
  font-weight: 700;
  letter-spacing: 0.04em;
}

.data-growth-unit,
.data-growth-grid text,
.data-growth-points text,
.data-growth-stages text {
  fill: #6e7d84;
  font-family: var(--font-mono);
  font-size: 11px;
  font-weight: 600;
  letter-spacing: 0.05em;
}

.data-growth-grid path {
  fill: none;
  stroke: rgba(20, 39, 53, 0.12);
  stroke-width: 1;
}

.data-growth-area {
  fill: url(#data-growth-area);
}

.data-growth-line {
  fill: none;
  stroke: #007dce;
  stroke-width: 6;
  stroke-linecap: round;
  stroke-linejoin: round;
  stroke-dasharray: 1;
  stroke-dashoffset: 1;
  transition: stroke-dashoffset 1.3s cubic-bezier(.22,.78,.24,1);
}

.data-growth-figure.is-flowing .data-growth-line {
  stroke-dashoffset: 0;
}

.data-growth-points circle {
  fill: #fff;
  stroke: #007dce;
  stroke-width: 5;
}

.data-growth-points text {
  fill: #142735;
  font-size: 15px;
}

.data-growth-unit {
  font-size: 15px;
}

.data-growth-current circle:first-child {
  fill: #007dce;
}

.data-growth-current .data-growth-halo {
  fill: rgba(0, 191, 232, 0.12);
  stroke: rgba(0, 125, 206, 0.24);
  stroke-width: 2;
}

.data-growth-current text {
  fill: #007dce;
  font-size: 24px;
  font-weight: 800;
}

.data-growth-stages text {
  font-size: 11px;
}

.data-growth-figure > figcaption {
  display: grid;
  grid-template-columns: auto minmax(0, 1fr);
  gap: 16px;
  align-items: start;
  width: min(var(--section-title-width), calc(100% - 32px));
  margin-right: auto;
  margin-left: auto;
  padding: 18px 0 26px;
  border-top: 1px solid rgba(20, 39, 53, 0.12);
  color: #41545f;
  font-size: 15px;
  line-height: 1.55;
}

.data-growth-mobile {
  display: none;
}

@media (max-width: 600px) {
  .data-growth-figure {
    width: calc(100% - 28px);
    margin-block: 38px 66px;
    margin-left: auto;
    border-radius: 24px;
  }

  .data-growth-header { display: none; }

  .data-growth-desktop {
    display: none !important;
  }

  .data-growth-mobile {
    display: block;
    padding: 22px 18px 18px;
    border-radius: 24px 24px 0 0;
    border-bottom: 1px solid var(--line);
    background: linear-gradient(145deg, rgba(0, 125, 206, 0.035), rgba(255, 255, 255, 0.96));
  }

  .data-growth-mobile-head {
    display: flex;
    align-items: flex-start;
    justify-content: space-between;
    gap: 16px;
  }

  .data-growth-mobile-head p {
    margin: 2px 0 0;
    color: #41545f;
    font-family: var(--font-mono);
    font-size: 24px;
    font-weight: 700;
    letter-spacing: 0.05em;
    text-transform: uppercase;
  }

  .data-growth-mobile-head strong {
    color: #007dce;
    font-family: var(--font-mono);
    font-size: 24px;
    line-height: 1;
    white-space: nowrap;
  }

  .data-growth-mobile > svg {
    display: block;
    width: 100%;
    margin-top: 18px;
  }

  .data-growth-mobile-grid {
    fill: none;
    stroke: rgba(20, 39, 53, 0.12);
  }

  .data-growth-mobile-area {
    fill: rgba(0, 191, 232, 0.12);
  }

  .data-growth-mobile-line {
    fill: none;
    stroke: #007dce;
    stroke-width: 3;
    stroke-linecap: round;
    stroke-linejoin: round;
  }

  .data-growth-mobile circle {
    fill: #fff;
    stroke: #007dce;
    stroke-width: 2.5;
  }

  .data-growth-mobile-stages {
    display: grid;
    grid-template-columns: repeat(2, minmax(0, 1fr));
    gap: 8px;
    margin-top: 8px;
  }

  .data-growth-mobile-stages span {
    min-width: 0;
    padding-top: 10px;
    border-top: 2px solid rgba(0, 125, 206, 0.2);
  }

  .data-growth-mobile-stages b,
  .data-growth-mobile-stages small {
    display: block;
    font-family: var(--font-mono);
  }

  .data-growth-mobile-stages b {
    color: #6e7d84;
    font-size: 11px;
  }

  .data-growth-mobile-stages small {
    margin-top: 4px;
    color: #142735;
    font-size: 15px;
    font-weight: 700;
    white-space: nowrap;
  }

  .data-growth-figure > figcaption {
    grid-template-columns: 1fr;
    gap: 8px;
    width: 100%;
    padding: 14px 18px 22px;
    border-top: 0;
    font-size: 13px;
  }
}

@media (max-width: 360px) {
  .data-growth-mobile-head {
    display: grid;
    gap: 10px;
  }

  .data-growth-mobile-head strong { font-size: 24px; }
}

@media (prefers-reduced-motion: reduce) {
  .data-growth-line {
    stroke-dashoffset: 0;
    transition: none;
  }
}

@media (max-width: 760px) {
  html[data-lang="zh"] .article-hero h1 {
    line-height: 1.08;
  }

  html[data-lang="zh"] .section-intro h2,
  html[data-lang="zh"] .task-landscape-head h2,
  html[data-lang="zh"] .capture-copy h3,
  html[data-lang="zh"] .distribution-atlas .field-copy h3,
  html[data-lang="zh"] .model-insight h3,
  html[data-lang="zh"] .model-demo-copy h3,
  html[data-lang="zh"] .data-agent-copy h3,
  html[data-lang="zh"] .closing h2 {
    line-height: 1.1;
  }

  html[data-lang="zh"] .dek,
  html[data-lang="zh"] .section-intro p,
  html[data-lang="zh"] .editorial-copy p {
    line-height: 1.64;
  }
}

/* Final Lab navigation overrides stay last so later density layers cannot undo them. */
.brand {
  display: flex;
  gap: 12px;
  align-items: center;
  width: 232px;
  overflow: visible;
}

html[data-lang="zh"] .brand {
  width: 220px;
}

.brand img {
  flex: 0 1 176px;
  width: auto;
  min-width: 0;
}

html[data-lang="zh"] .brand img {
  flex-basis: 164px;
}

.brand-lab,
.footer-brand-lab {
  display: inline-flex;
  align-items: center;
  flex: none;
  height: 24px;
  padding-left: 11px;
  border-left: 1px solid var(--line-strong);
  color: var(--blue);
  font-family: "JetBrains Mono Variable", "SFMono-Regular", Consolas, monospace;
  font-size: 14px;
  font-variation-settings: "wght" 650;
  letter-spacing: 0.04em;
}

.brand-lab {
  position: relative;
  border-left: 0;
}

.brand-lab::before {
  position: absolute;
  top: 50%;
  left: -4px;
  width: 1px;
  height: 100%;
  background: var(--line-strong);
  transform: translateY(-50%);
  content: "";
}

.footer-brand {
  display: flex;
  gap: 13px;
  align-items: center;
  width: 242px;
  overflow: visible;
}

.footer-brand img {
  flex: 0 1 184px;
  width: auto;
  min-width: 0;
}

html[data-lang="zh"] .footer-brand img {
  flex-basis: 172px;
}

@media (min-width: 1181px) {
  .language-switch {
    grid-column: 3;
    justify-self: end;
  }
}

@media (max-width: 1180px) {
  .site-header {
    grid-template-columns: 232px minmax(0, 1fr) auto auto;
  }

  .language-switch {
    grid-column: 3;
    justify-self: end;
  }

  .menu-button {
    grid-column: 4;
  }
}

@media (max-width: 760px) {
  .site-header {
    grid-template-columns: minmax(0, 1fr) auto auto;
  }

  .language-switch {
    grid-column: 2;
  }

  .menu-button {
    grid-column: 3;
  }

  .brand,
  html[data-lang="zh"] .brand {
    width: 168px;
  }

  .brand img,
  html[data-lang="zh"] .brand img {
    flex-basis: 126px;
  }

  .brand-lab {
    height: 18px;
    padding-left: 8px;
    font-size: 11px;
  }

}

@media (max-width: 340px) {
  .brand,
  html[data-lang="zh"] .brand {
    width: 138px;
  }

  .brand img,
  html[data-lang="zh"] .brand img {
    flex-basis: 102px;
  }

  .brand-lab {
    height: 16px;
    padding-left: 6px;
    font-size: 9px;
  }

  .citation-lead h2 {
    font-size: 46px;
    text-wrap: nowrap;
    white-space: nowrap;
  }
}

/* Final footer override: article footer mirrors the minimal Lab index footer. */
.site-footer {
  display: block;
  width: 100%;
  min-height: 0;
  margin: 0;
  padding: 26px max(24px, calc((100vw - 1420px) / 2)) 30px
    max(24px, calc((100vw - 1800px) / 2));
  border-top: 1px solid rgba(20, 38, 50, 0.16);
  background: transparent;
  color: #778791;
  font-family: ui-monospace, "SFMono-Regular", Consolas, monospace;
  font-size: 11px;
  line-height: normal;
  letter-spacing: 0.08em;
}

.site-footer p {
  margin: 0;
  color: inherit;
}

@media (max-width: 760px) {
  .site-footer {
    padding: 22px 16px 26px;
  }
}

@media (max-width: 340px) and (max-height: 620px) {
  .site-footer {
    padding: 18px 16px 22px;
  }
}

/* Wide displays: release the article rail progressively instead of dropping it
   at one breakpoint. This keeps the 27-inch canvas open while preserving a
   safe corridor between the fixed TOC and wide sections around 1600–1920px. */
@media (min-width: 1600px) {
  :root {
    --reading: 980px;
  }

  main {
    padding-left: clamp(0px, calc(1840px - 100vw), var(--toc-rail));
  }

  .site-nav {
    left: max(24px, calc((100vw - 1800px) / 2));
  }
}

/* Mobile article opening: keep the title close to the compact header instead
   of inheriting the desktop stage's large top reserve. */
@media (max-width: 760px) {
  .article-hero {
    padding: 48px 16px 84px;
  }

  .edition {
    margin-bottom: 22px;
  }
}

@media (max-width: 420px) {
  .article-hero {
    padding-top: 36px;
  }
}

@media (max-width: 340px) and (max-height: 620px) {
  .article-hero {
    padding: 28px 16px 68px;
  }
}