:root {
  --paper: #f5f7fa;
  --mist: #e9edf2;
  --ink: #14181e;
  --slate: #626b78;
  --muted: #89939f;
  --brand: #2a50d8;
  --ice: #b7e4e8;
  --border: #d5dbe3;
  --dark: #11151b;
  --dark-soft: #18202a;
  --dark-border: #303846;
  --dark-muted: #9ba6b3;
  --white: #ffffff;
  --container: 1280px;
  --ease: cubic-bezier(0.22, 1, 0.36, 1);
  color-scheme: light;
  font-family: ui-sans-serif, -apple-system, BlinkMacSystemFont, "Segoe UI", "PingFang SC", "Microsoft YaHei", Arial, sans-serif;
  font-synthesis: none;
}

* {
  box-sizing: border-box;
}

html {
  background: var(--paper);
  scroll-behavior: smooth;
}

body {
  margin: 0;
  min-width: 320px;
  overflow-x: clip;
  background: var(--paper);
  color: var(--ink);
  font-size: 16px;
  line-height: 1.6;
  -webkit-font-smoothing: antialiased;
  text-rendering: optimizeLegibility;
}

body,
button,
a {
  font-family: inherit;
}

a {
  color: inherit;
  text-decoration: none;
}

button {
  border: 0;
  cursor: pointer;
}

img,
svg {
  display: block;
  max-width: 100%;
}

svg text {
  font-family: ui-sans-serif, -apple-system, BlinkMacSystemFont, "Segoe UI", "PingFang SC", "Microsoft YaHei", Arial, sans-serif;
}

.container {
  width: min(var(--container), calc(100% - 64px));
  margin: 0 auto;
}

.sr-only {
  position: absolute;
  width: 1px;
  height: 1px;
  padding: 0;
  margin: -1px;
  overflow: hidden;
  clip: rect(0, 0, 0, 0);
  white-space: nowrap;
  border: 0;
}

.skip-link {
  position: fixed;
  z-index: 100;
  top: 12px;
  left: 12px;
  padding: 10px 14px;
  transform: translateY(-160%);
  background: var(--ink);
  color: var(--white);
  font-size: 13px;
}

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

:focus-visible {
  outline: 2px solid var(--brand);
  outline-offset: 4px;
}

.site-header {
  position: fixed;
  z-index: 20;
  top: 0;
  right: 0;
  left: 0;
  height: 78px;
  color: var(--ink);
  transition: background 280ms ease, color 280ms ease, border-color 280ms ease;
}

.site-header.is-scrolled {
  border-bottom: 1px solid rgba(213, 219, 227, 0.76);
  background: rgba(245, 247, 250, 0.88);
  -webkit-backdrop-filter: blur(18px);
  backdrop-filter: blur(18px);
}

.site-header.is-dark {
  border-bottom-color: rgba(48, 56, 70, 0.82);
  background: rgba(17, 21, 27, 0.9);
  color: var(--white);
}

.nav-shell {
  display: flex;
  height: 100%;
  align-items: center;
  justify-content: space-between;
}

.brand-lockup {
  display: inline-flex;
  min-width: 195px;
  align-items: center;
  gap: 10px;
}

.brand-mark {
  width: 38px;
  height: 38px;
  flex: 0 0 auto;
}

.brand-words {
  display: grid;
  gap: 0;
  line-height: 1;
}

.brand-en {
  font-size: 16px;
  font-weight: 650;
  letter-spacing: 0.045em;
}

.brand-en em,
.site-footer em {
  color: var(--brand);
  font-size: 0.72em;
  font-style: normal;
  font-weight: 800;
  letter-spacing: 0.16em;
  vertical-align: 0.12em;
}

.site-header.is-dark .brand-en em {
  color: var(--ice);
}

.brand-zh {
  margin-top: 5px;
  color: var(--slate);
  font-size: 10px;
  letter-spacing: 0.24em;
}

.site-header.is-dark .brand-zh {
  color: var(--dark-muted);
}

.site-nav {
  display: flex;
  align-items: center;
  gap: 32px;
  color: var(--slate);
  font-size: 12px;
  font-weight: 650;
  letter-spacing: 0.095em;
  text-transform: uppercase;
}

.site-nav a {
  position: relative;
  padding: 9px 0;
  transition: color 180ms ease;
}

.site-nav a::after {
  position: absolute;
  right: 0;
  bottom: 3px;
  left: 0;
  height: 1px;
  transform: scaleX(0);
  transform-origin: right center;
  background: currentColor;
  content: "";
  transition: transform 180ms ease;
}

.site-nav a:hover,
.site-nav a.is-active {
  color: var(--ink);
}

.site-header.is-dark .site-nav a:hover,
.site-header.is-dark .site-nav a.is-active {
  color: var(--white);
}

.site-nav a:hover::after,
.site-nav a.is-active::after {
  transform: scaleX(1);
  transform-origin: left center;
}

.site-nav .nav-cta {
  display: inline-flex;
  align-items: center;
  gap: 8px;
  padding: 10px 13px;
  border: 1px solid var(--border);
  color: var(--ink);
  letter-spacing: 0.08em;
}

.site-nav .nav-cta::after {
  display: none;
}

.site-header.is-dark .site-nav .nav-cta {
  border-color: var(--dark-border);
  color: var(--white);
}

.site-nav .nav-cta:hover {
  border-color: var(--brand);
  background: var(--brand);
  color: var(--white);
}

.menu-toggle {
  display: none;
  width: 42px;
  height: 42px;
  padding: 12px 9px;
  background: transparent;
  color: currentColor;
}

.menu-toggle span:not(.sr-only) {
  display: block;
  width: 24px;
  height: 1px;
  margin: 6px auto;
  background: currentColor;
  transition: transform 180ms ease;
}

.menu-toggle[aria-expanded="true"] span:not(.sr-only):first-of-type {
  transform: translateY(3.5px) rotate(45deg);
}

.menu-toggle[aria-expanded="true"] span:not(.sr-only):last-of-type {
  transform: translateY(-3.5px) rotate(-45deg);
}

.section-light,
.section-mist,
.section-dark {
  position: relative;
  overflow: hidden;
}

.section-light {
  background: var(--paper);
}

.section-mist {
  background: var(--mist);
}

.section-dark {
  background: var(--dark);
  color: var(--white);
}

.eyebrow {
  display: flex;
  align-items: center;
  gap: 11px;
  margin: 0 0 30px;
  color: var(--brand);
  font-size: 11px;
  font-weight: 800;
  letter-spacing: 0.18em;
  line-height: 1.2;
}

.eyebrow-index {
  display: inline-grid;
  width: 24px;
  height: 24px;
  place-items: center;
  border: 1px solid currentColor;
  border-radius: 50%;
  font-size: 10px;
  letter-spacing: 0;
}

.eyebrow-dark {
  color: var(--ice);
}

.button {
  display: inline-flex;
  align-items: center;
  justify-content: center;
  gap: 24px;
  min-height: 48px;
  padding: 0 18px;
  font-size: 12px;
  font-weight: 750;
  letter-spacing: 0.08em;
  transition: background 180ms ease, color 180ms ease, transform 180ms ease, border-color 180ms ease;
}

.button:hover {
  transform: translateY(-2px);
}

.button-dark {
  background: var(--ink);
  color: var(--white);
}

.button-dark:hover {
  background: var(--brand);
}

.text-link {
  display: inline-flex;
  align-items: center;
  gap: 10px;
  color: var(--ink);
  font-size: 12px;
  font-weight: 750;
  letter-spacing: 0.08em;
}

.text-link span,
.button span {
  color: var(--brand);
  font-size: 16px;
  line-height: 0;
}

.text-link:hover {
  color: var(--brand);
}

.hero {
  display: flex;
  min-height: 100svh;
  padding: 130px 0 66px;
  align-items: center;
}

.hero-grid {
  display: grid;
  min-height: 640px;
  grid-template-columns: minmax(0, 0.84fr) minmax(0, 1.16fr);
  gap: 56px;
  align-items: center;
}

.hero-copy {
  position: relative;
  z-index: 1;
  padding-bottom: 20px;
}

.hero h1,
.section-intro h2,
.contact-block h2 {
  margin: 0;
  font-size: clamp(3.2rem, 6.4vw, 6.7rem);
  font-weight: 600;
  letter-spacing: -0.075em;
  line-height: 0.99;
}

.hero h1 span,
.section-intro h2 span,
.contact-block h2 span {
  color: var(--brand);
}

.hero-description {
  max-width: 460px;
  margin: 34px 0 0;
  color: var(--slate);
  font-size: 17px;
  line-height: 1.9;
}

.hero-actions {
  display: flex;
  flex-wrap: wrap;
  align-items: center;
  gap: 28px;
  margin-top: 38px;
}

.hero-meta {
  display: flex;
  flex-wrap: wrap;
  align-items: center;
  gap: 10px;
  margin-top: 78px;
  color: var(--muted);
  font-size: 10px;
  font-weight: 800;
  letter-spacing: 0.14em;
}

.hero-meta i {
  display: block;
  width: 4px;
  height: 4px;
  border-radius: 50%;
  background: var(--brand);
}

.hero-visual {
  position: relative;
  min-width: 0;
}

.hero-visual::before {
  position: absolute;
  top: 12%;
  right: 3%;
  width: 58%;
  height: 70%;
  border: 1px solid rgba(42, 80, 216, 0.14);
  border-radius: 50%;
  content: "";
  transform: rotate(-17deg);
}

.hero-visual-svg {
  position: relative;
  width: 100%;
  min-height: 540px;
  overflow: visible;
}

.hero-visual-svg .hero-orbit {
  fill: none;
  stroke: var(--brand);
  stroke-dasharray: 2 12;
  stroke-width: 1;
  opacity: 0.4;
}

.hero-visual-svg .hero-route {
  fill: none;
  stroke: var(--ink);
  stroke-width: 1.4;
}

.hero-visual-svg .route-secondary {
  stroke: var(--brand);
  stroke-dasharray: 2 8;
  opacity: 0.6;
}

.hero-label {
  fill: var(--muted);
  font-size: 9px;
  font-weight: 800;
  letter-spacing: 0.2em;
}

.hero-label-context {
  fill: var(--brand);
}

.hero-module rect {
  fill: rgba(245, 247, 250, 0.8);
  stroke: var(--border);
  stroke-width: 1;
}

.hero-module path {
  fill: none;
  stroke: var(--brand);
  stroke-width: 1.4;
}

.hero-module text {
  fill: var(--ink);
  font-size: 8px;
  font-weight: 800;
  letter-spacing: 0.16em;
}

.hero-node {
  fill: var(--paper);
  stroke: var(--ink);
  stroke-width: 1.5;
}

.hero-node-intent {
  fill: var(--brand);
  stroke: var(--brand);
}

.hero-node-context {
  fill: var(--ice);
  stroke: var(--brand);
}

.hero-node-outcome {
  fill: var(--ink);
  stroke: var(--brand);
  stroke-width: 3;
}

.hero-signal {
  fill: var(--brand);
  animation: signal-shift 3.8s var(--ease) infinite;
}

.hero-signal-2 {
  fill: var(--ice);
  animation-delay: 1.8s;
  animation-duration: 3.1s;
}

@keyframes signal-shift {
  0%, 100% { opacity: 0.2; transform: translateX(0); }
  38% { opacity: 1; transform: translateX(116px); }
  72% { opacity: 0.65; transform: translateX(344px); }
}

.hero-visual-caption {
  display: flex;
  align-items: center;
  gap: 12px;
  margin: -21px 0 0 12%;
  color: var(--muted);
  font-size: 10px;
  font-weight: 800;
  letter-spacing: 0.14em;
}

.hero-visual-caption > span:first-child {
  color: var(--brand);
}

.caption-line {
  display: block;
  width: 48px;
  height: 1px;
  background: var(--brand);
}

.scroll-cue {
  position: absolute;
  right: 32px;
  bottom: 30px;
  display: inline-flex;
  align-items: center;
  gap: 13px;
  color: var(--muted);
  font-size: 9px;
  font-weight: 800;
  letter-spacing: 0.16em;
  writing-mode: vertical-rl;
}

.scroll-cue b {
  color: var(--brand);
  font-size: 20px;
  font-weight: 400;
}

.team-section,
.model-section,
.human-section {
  padding: 150px 0 132px;
}

.section-intro {
  display: grid;
  max-width: 870px;
  grid-template-columns: minmax(0, 1.2fr) minmax(260px, 0.8fr);
  column-gap: 72px;
  align-items: end;
}

.section-intro .eyebrow {
  grid-column: 1 / -1;
}

.section-intro h2 {
  font-size: clamp(2.9rem, 5.2vw, 5.6rem);
}

.section-intro > p:last-child {
  max-width: 330px;
  margin: 0 0 4px;
  color: var(--slate);
  font-size: 15px;
  line-height: 1.85;
}

.team-map-shell {
  margin-top: 92px;
  border: 1px solid var(--border);
  background: rgba(245, 247, 250, 0.5);
}

.map-heading,
.process-board-top {
  display: flex;
  align-items: center;
  justify-content: space-between;
  min-height: 54px;
  padding: 0 20px;
  border-bottom: 1px solid var(--border);
  color: var(--muted);
  font-size: 10px;
  font-weight: 800;
  letter-spacing: 0.14em;
}

.agent-map {
  width: 100%;
  height: auto;
}

.map-connector {
  fill: none;
  stroke: #9faab6;
  stroke-width: 1;
}

.map-connector-main {
  stroke: var(--brand);
  stroke-width: 1.4;
}

.map-connector-dashed {
  stroke: var(--brand);
  stroke-dasharray: 3 7;
  opacity: 0.7;
}

.map-anchor rect,
.map-output rect {
  fill: var(--ink);
  stroke: var(--ink);
}

.map-anchor text,
.map-output text {
  fill: var(--white);
  font-size: 12px;
  font-weight: 800;
  letter-spacing: 0.14em;
}

.map-anchor .map-subtext,
.map-output .map-subtext {
  fill: var(--ice);
  font-size: 9px;
  letter-spacing: 0.05em;
}

.map-node {
  cursor: pointer;
  outline: none;
}

.map-node rect {
  fill: rgba(245, 247, 250, 0.88);
  stroke: #b6bec9;
  stroke-width: 1;
  transition: fill 180ms ease, stroke 180ms ease, transform 180ms ease;
}

.map-node text {
  fill: var(--ink);
  font-size: 10px;
  font-weight: 800;
  letter-spacing: 0.08em;
  pointer-events: none;
}

.map-node .map-subtext {
  fill: var(--slate);
  font-size: 9px;
  font-weight: 500;
  letter-spacing: 0.03em;
}

.map-node:hover rect,
.map-node:focus rect,
.map-node[aria-selected="true"] rect {
  fill: var(--brand);
  stroke: var(--brand);
}

.map-node:hover text,
.map-node:focus text,
.map-node[aria-selected="true"] text {
  fill: var(--white);
}

.map-node:hover .map-subtext,
.map-node:focus .map-subtext,
.map-node[aria-selected="true"] .map-subtext {
  fill: var(--ice);
}

.map-node-fade {
  opacity: 0.46;
}

.map-gate circle {
  fill: var(--ice);
  stroke: var(--brand);
  stroke-width: 2;
}

.map-gate text {
  fill: var(--brand);
  font-size: 8px;
  font-weight: 800;
  letter-spacing: 0.12em;
}

.map-output path {
  fill: none;
  stroke: var(--ice);
  stroke-width: 2;
}

.map-legend {
  display: flex;
  flex-wrap: wrap;
  align-items: center;
  gap: 9px;
  min-height: 50px;
  padding: 0 20px;
  border-top: 1px solid var(--border);
  color: var(--slate);
  font-size: 10px;
}

.legend-dot,
.legend-gate {
  display: block;
  width: 7px;
  height: 7px;
  border-radius: 50%;
  background: var(--brand);
}

.legend-gate {
  background: var(--ice);
  border: 1px solid var(--brand);
}

.legend-line {
  display: block;
  width: 30px;
  height: 1px;
  margin-left: 10px;
  background: #9faab6;
}

.agent-map-mobile {
  display: none;
}

.agent-detail {
  display: grid;
  grid-template-columns: 0.65fr 1.1fr 1.25fr;
  gap: 24px;
  margin-top: 24px;
  padding: 24px 26px;
  border-top: 2px solid var(--ink);
  border-bottom: 1px solid var(--border);
}

.detail-index,
.detail-data dt {
  color: var(--brand);
  font-size: 10px;
  font-weight: 800;
  letter-spacing: 0.14em;
}

.detail-main h3 {
  margin: -4px 0 5px;
  font-size: 25px;
  font-weight: 600;
  letter-spacing: -0.04em;
}

.detail-main p {
  max-width: 330px;
  margin: 0;
  color: var(--slate);
  font-size: 14px;
}

.detail-data {
  display: grid;
  grid-template-columns: repeat(3, 1fr);
  gap: 15px;
  margin: 0;
}

.detail-data div {
  padding-left: 15px;
  border-left: 1px solid var(--border);
}

.detail-data dd {
  margin: 7px 0 0;
  color: var(--ink);
  font-size: 13px;
  line-height: 1.5;
}

.handoff-strip {
  display: grid;
  grid-template-columns: 1fr 0.3fr 1fr;
  gap: 28px;
  margin-top: 80px;
  padding-top: 22px;
  border-top: 1px solid var(--border);
  align-items: center;
}

.handoff-side {
  display: grid;
  gap: 4px;
}

.handoff-agent {
  text-align: right;
}

.strip-label {
  color: var(--brand);
  font-size: 10px;
  font-weight: 800;
  letter-spacing: 0.14em;
}

.handoff-side strong {
  font-size: 19px;
  font-weight: 600;
  letter-spacing: -0.03em;
}

.handoff-side small {
  color: var(--slate);
  font-size: 12px;
}

.handoff-axis {
  display: flex;
  align-items: center;
  gap: 6px;
}

.handoff-axis span {
  width: 8px;
  height: 8px;
  border: 1px solid var(--brand);
  border-radius: 50%;
}

.handoff-axis span:first-child,
.handoff-axis span:last-child {
  background: var(--brand);
}

.handoff-axis i {
  height: 1px;
  flex: 1;
  background: var(--brand);
}

.model-section {
  border-top: 1px solid var(--border);
}

.model-intro {
  max-width: 890px;
}

.process-board {
  display: flex;
  flex-direction: column;
  margin-top: 94px;
  border: 1px solid var(--border);
}

.process-board-top {
  justify-content: flex-start;
  gap: 12px;
}

.process-board-arrow {
  color: var(--brand);
  font-size: 18px;
  font-weight: 400;
}

.process-list {
  position: relative;
  display: grid;
  grid-template-columns: repeat(7, minmax(0, 1fr));
  padding: 54px 0 50px;
  margin: 0;
  list-style: none;
}

.process-list::before {
  position: absolute;
  top: 82px;
  right: 0;
  left: 0;
  height: 1px;
  background: var(--ink);
  content: "";
}

.process-step {
  position: relative;
  z-index: 1;
  min-height: 252px;
  padding: 0 14px;
  border-right: 1px solid var(--border);
}

.process-step:last-of-type {
  border-right: 0;
}

.step-number {
  display: grid;
  width: 57px;
  height: 57px;
  margin: 0 auto 26px;
  border: 1px solid var(--ink);
  border-radius: 50%;
  place-items: center;
  background: var(--paper);
  color: var(--ink);
  font-size: 11px;
  font-weight: 800;
  transition: background 180ms ease, color 180ms ease, border-color 180ms ease;
}

.process-step.is-active .step-number,
.process-step:hover .step-number {
  border-color: var(--brand);
  background: var(--paper);
  color: var(--brand);
}

.process-step.is-active .step-en,
.process-step:hover .step-en {
  color: var(--brand);
}

.step-en,
.step-zh,
.process-step p,
.process-step b {
  display: block;
}

.step-en {
  color: var(--brand);
  font-size: 16px;
  font-weight: 650;
  letter-spacing: -0.02em;
  line-height: 1.2;
}

.step-zh {
  margin-top: 3px;
  font-size: 13px;
  font-weight: 650;
}

.process-step p {
  min-height: 58px;
  margin: 14px 0 12px;
  color: var(--slate);
  font-size: 12px;
  line-height: 1.65;
}

.process-step b {
  color: var(--ink);
  font-size: 10px;
  font-weight: 800;
  letter-spacing: 0.06em;
}

.process-step b::before {
  display: inline-block;
  width: 5px;
  height: 5px;
  margin: 0 7px 1px 0;
  border-radius: 50%;
  background: var(--brand);
  content: "";
}

.human-section {
  min-height: 100svh;
  padding-top: 160px;
  background: var(--dark);
}

.human-layout {
  display: grid;
  grid-template-columns: minmax(0, 0.84fr) minmax(0, 1.16fr);
  gap: 80px;
  align-items: center;
}

.human-copy h2 {
  margin: 0;
  font-size: clamp(3.1rem, 5.7vw, 6.3rem);
  font-weight: 550;
  letter-spacing: -0.08em;
  line-height: 1;
}

.human-copy h2 span {
  color: var(--ice);
}

.human-copy > p:not(.eyebrow) {
  max-width: 430px;
  margin: 30px 0 0;
  color: var(--dark-muted);
  font-size: 16px;
  line-height: 1.8;
}

.human-copy > .human-strong {
  color: var(--white);
  font-size: 18px;
}

.human-system {
  position: relative;
  min-height: 450px;
  padding: 50px 48px;
  border: 1px solid var(--dark-border);
  background: rgba(24, 32, 42, 0.42);
}

.system-axis-label {
  position: absolute;
  top: 22px;
  left: 48px;
  color: var(--ice);
  font-size: 10px;
  font-weight: 800;
  letter-spacing: 0.15em;
}

.system-lane {
  position: relative;
  z-index: 1;
  display: grid;
  min-height: 108px;
  align-items: center;
  border: 1px solid var(--dark-border);
  background: var(--dark);
}

.system-lane-human {
  margin-top: 28px;
  border-color: #647bce;
}

.system-lane-agent {
  margin-top: 84px;
  border-color: var(--brand);
}

.lane-name {
  position: absolute;
  top: 13px;
  left: 17px;
  color: var(--dark-muted);
  font-size: 9px;
  font-weight: 800;
  letter-spacing: 0.14em;
}

.system-lane-human .lane-name {
  color: var(--ice);
}

.lane-steps {
  display: flex;
  align-items: center;
  justify-content: space-around;
  gap: 8px;
  padding: 28px 12px 7px;
  color: var(--white);
  font-size: 13px;
  letter-spacing: 0.02em;
}

.lane-steps i {
  color: var(--brand);
  font-size: 18px;
  font-style: normal;
}

.system-bridge {
  position: absolute;
  top: 137px;
  right: 21%;
  left: 21%;
  display: flex;
  justify-content: space-between;
  height: 140px;
  border-top: 1px dashed rgba(183, 228, 232, 0.46);
  border-bottom: 1px dashed rgba(183, 228, 232, 0.46);
}

.system-bridge span {
  display: block;
  width: 1px;
  height: 100%;
  background: rgba(183, 228, 232, 0.38);
}

.system-result {
  display: flex;
  align-items: center;
  justify-content: center;
  gap: 15px;
  margin-top: 24px;
  color: var(--dark-muted);
  font-size: 10px;
  font-weight: 800;
  letter-spacing: 0.14em;
}

.system-result b {
  color: var(--ice);
  font-size: 20px;
  font-weight: 400;
}

.principles {
  margin-top: 132px;
  border-top: 1px solid var(--dark-border);
}

.principle-row {
  display: grid;
  grid-template-columns: 70px 1fr 30px;
  gap: 20px;
  padding: 26px 0;
  border-bottom: 1px solid var(--dark-border);
  align-items: center;
}

.principle-row > span {
  color: var(--ice);
  font-size: 11px;
  font-weight: 800;
  letter-spacing: 0.13em;
}

.principle-row h3 {
  margin: 0;
  color: var(--white);
  font-size: 21px;
  font-weight: 600;
  letter-spacing: -0.035em;
}

.principle-row h3 em {
  margin-left: 12px;
  color: var(--dark-muted);
  font-size: 12px;
  font-style: normal;
  font-weight: 500;
  letter-spacing: 0.05em;
}

.principle-row p {
  margin: 5px 0 0;
  color: var(--dark-muted);
  font-size: 13px;
}

.principle-row > b {
  color: var(--brand);
  font-size: 21px;
  font-weight: 400;
  text-align: right;
}

.contact-block {
  padding: 170px 0 130px;
}

.contact-block h2 {
  max-width: 730px;
  font-size: clamp(3.2rem, 6.5vw, 7rem);
}

.contact-block > p:not(.eyebrow) {
  margin: 28px 0 12px;
  color: var(--dark-muted);
  font-size: 17px;
}

.contact-placeholder {
  display: inline-flex;
  padding-bottom: 5px;
  border-bottom: 1px solid var(--dark-border);
  color: var(--dark-muted);
  font-size: 11px;
  letter-spacing: 0.08em;
}

.site-footer {
  display: flex;
  min-height: 88px;
  align-items: flex-end;
  justify-content: space-between;
  gap: 30px;
  padding-top: 24px;
  border-top: 1px solid var(--dark-border);
  color: var(--dark-muted);
  font-size: 11px;
}

.site-footer > div {
  display: grid;
  gap: 6px;
}

.site-footer > div:last-child {
  text-align: right;
}

.site-footer strong {
  color: var(--white);
  font-size: 18px;
  font-weight: 650;
  letter-spacing: 0.04em;
}

.site-footer span {
  letter-spacing: 0.08em;
}

.site-footer em {
  color: var(--ice);
}

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

.js .reveal {
  opacity: 0;
  transform: translateY(22px);
  transition: opacity 720ms var(--ease), transform 720ms var(--ease);
}

.js .reveal.is-visible {
  opacity: 1;
  transform: none;
}

.js .reveal-delay-1 {
  transition-delay: 100ms;
}

@media (max-width: 1120px) {
  .hero-grid,
  .human-layout {
    gap: 38px;
  }

  .hero h1,
  .human-copy h2 {
    font-size: clamp(3rem, 6.3vw, 5.2rem);
  }

  .section-intro h2 {
    font-size: clamp(2.8rem, 5.2vw, 4.7rem);
  }

  .process-step {
    padding: 0 10px;
  }

  .process-step p {
    font-size: 11px;
  }

  .change-node {
    padding: 9px 10px;
    font-size: 10px;
  }
}

@media (max-width: 820px) {
  .container {
    width: min(var(--container), calc(100% - 40px));
  }

  .site-header {
    height: 70px;
  }

  .menu-toggle {
    display: block;
  }

  .site-nav {
    position: absolute;
    top: 70px;
    right: 20px;
    left: 20px;
    display: grid;
    gap: 0;
    padding: 10px 18px 17px;
    border: 1px solid var(--border);
    background: rgba(245, 247, 250, 0.98);
    box-shadow: 0 18px 45px rgba(20, 24, 30, 0.1);
    opacity: 0;
    pointer-events: none;
    transform: translateY(-8px);
    transition: opacity 180ms ease, transform 180ms ease;
  }

  .site-header.is-dark .site-nav {
    border-color: var(--dark-border);
    background: rgba(17, 21, 27, 0.98);
  }

  .site-nav.is-open {
    opacity: 1;
    pointer-events: auto;
    transform: translateY(0);
  }

  .site-nav a {
    padding: 14px 0;
    border-bottom: 1px solid var(--border);
  }

  .site-header.is-dark .site-nav a {
    border-bottom-color: var(--dark-border);
  }

  .site-nav a:last-child {
    border-bottom: 0;
  }

  .site-nav a::after {
    display: none;
  }

  .site-nav .nav-cta {
    margin-top: 10px;
    padding: 12px;
    border: 1px solid var(--border);
  }

  .hero {
    min-height: auto;
    padding: 125px 0 85px;
  }

  .hero-grid,
  .human-layout {
    grid-template-columns: 1fr;
  }

  .hero-grid {
    min-height: 0;
    gap: 42px;
  }

  .hero-visual-svg {
    min-height: 0;
  }

  .hero-visual::before {
    top: 10%;
    right: 8%;
    width: 68%;
  }

  .scroll-cue {
    position: static;
    margin: 28px 20px 0 auto;
  }

  .section-intro {
    grid-template-columns: 1fr;
    gap: 26px;
  }

  .section-intro > p:last-child {
    max-width: 510px;
    margin: 0;
  }

  .team-section,
  .model-section,
  .human-section {
    padding: 110px 0 92px;
  }

  .team-map-shell,
  .process-board {
    margin-top: 60px;
  }

  .agent-map-desktop {
    display: none;
  }

  .agent-map-mobile {
    position: relative;
    display: grid;
    gap: 10px;
    padding: 26px 18px 28px 28px;
  }

  .mobile-flow-line {
    position: absolute;
    top: 41px;
    bottom: 49px;
    left: 38px;
    width: 1px;
    background: var(--brand);
    opacity: 0.55;
  }

  .mobile-agent-node {
    position: relative;
    display: grid;
    grid-template-columns: 31px 1fr 22px;
    grid-template-rows: auto auto;
    column-gap: 13px;
    min-height: 62px;
    padding: 11px 14px 11px 0;
    border-bottom: 1px solid var(--border);
    background: transparent;
    color: var(--ink);
    text-align: left;
  }

  .mobile-agent-node > span {
    grid-row: 1 / 3;
    display: grid;
    width: 22px;
    height: 22px;
    margin-top: 2px;
    border: 1px solid var(--brand);
    border-radius: 50%;
    place-items: center;
    background: var(--mist);
    color: var(--brand);
    font-size: 9px;
    font-weight: 800;
  }

  .mobile-agent-node strong {
    font-size: 15px;
    font-weight: 650;
  }

  .mobile-agent-node em {
    color: var(--slate);
    font-size: 12px;
    font-style: normal;
  }

  .mobile-agent-node b {
    grid-column: 3;
    grid-row: 1 / 3;
    align-self: center;
    color: var(--brand);
    font-size: 18px;
    font-weight: 400;
  }

  .mobile-agent-node:hover,
  .mobile-agent-node:focus-visible {
    color: var(--brand);
  }

  .mobile-agent-node:last-child {
    border-bottom: 0;
  }

  .map-legend {
    padding: 13px 18px;
    font-size: 9px;
  }

  .agent-detail {
    grid-template-columns: 1fr;
    gap: 17px;
    padding: 22px 20px;
  }

  .detail-data {
    grid-template-columns: repeat(3, 1fr);
  }

  .handoff-strip {
    grid-template-columns: 1fr;
    gap: 18px;
    margin-top: 60px;
  }

  .handoff-agent {
    text-align: left;
  }

  .handoff-axis {
    max-width: 180px;
    transform: rotate(90deg);
  }

  .process-list {
    display: grid;
    grid-template-columns: 58px 1fr;
    gap: 0;
    padding: 24px 24px 20px 38px;
  }

  .process-list::before {
    top: 58px;
    right: auto;
    bottom: 64px;
    left: 54px;
    width: 1px;
    height: auto;
  }

  .process-step {
    display: grid;
    min-height: 0;
    grid-column: 1 / -1;
    grid-template-columns: 58px 1fr;
    grid-template-rows: auto auto auto auto;
    column-gap: 17px;
    padding: 0 0 28px;
    border-right: 0;
  }

  .step-number {
    grid-row: 1 / 5;
    width: 43px;
    height: 43px;
    margin: 0;
    font-size: 10px;
  }

  .step-en {
    padding-top: 5px;
    font-size: 16px;
  }

  .step-zh {
    margin-top: 0;
  }

  .process-step p {
    min-height: 0;
    margin: 8px 0;
  }

  .process-board-top {
    flex-wrap: wrap;
    gap: 8px;
    padding: 10px 16px;
    font-size: 9px;
  }

  .human-system {
    min-height: 420px;
    padding: 48px 22px 28px;
  }

  .system-axis-label {
    left: 22px;
  }

  .lane-steps {
    font-size: 12px;
  }

  .principles {
    margin-top: 86px;
  }

  .contact-block {
    padding: 118px 0 92px;
  }
}

@media (max-width: 520px) {
  .container {
    width: min(var(--container), calc(100% - 32px));
  }

  .brand-lockup {
    min-width: 0;
  }

  .brand-mark {
    width: 34px;
    height: 34px;
  }

  .brand-en {
    font-size: 14px;
  }

  .hero h1,
  .section-intro h2,
  .human-copy h2,
  .contact-block h2 {
    font-size: clamp(2.72rem, 12vw, 4.2rem);
    line-height: 1.02;
  }

  .hero-description {
    margin-top: 25px;
    font-size: 15px;
    line-height: 1.8;
  }

  .hero-actions {
    align-items: flex-start;
    flex-direction: column;
    gap: 18px;
    margin-top: 30px;
  }

  .hero-meta {
    gap: 7px;
    margin-top: 48px;
    font-size: 8px;
  }

  .hero-visual-svg {
    width: 124%;
    max-width: none;
    margin-left: -12%;
  }

  .hero-visual-caption {
    margin-left: 8%;
    font-size: 8px;
  }

  .eyebrow {
    margin-bottom: 23px;
    font-size: 9px;
  }

  .team-section,
  .model-section,
  .human-section {
    padding: 86px 0 72px;
  }

  .team-map-shell,
  .process-board {
    margin-top: 45px;
  }

  .map-heading {
    display: grid;
    gap: 4px;
    min-height: 65px;
    padding: 12px 16px;
    font-size: 8px;
  }

  .agent-map-mobile {
    padding-left: 18px;
  }

  .mobile-flow-line {
    left: 28px;
  }

  .mobile-agent-node {
    grid-template-columns: 25px 1fr 19px;
    column-gap: 10px;
  }

  .mobile-agent-node > span {
    width: 20px;
    height: 20px;
  }

  .detail-data {
    grid-template-columns: 1fr;
    gap: 12px;
  }

  .detail-data div {
    padding-left: 11px;
  }

  .handoff-side strong {
    font-size: 17px;
  }

  .process-list {
    padding-left: 19px;
  }

  .process-list::before {
    left: 35px;
  }

  .process-step {
    grid-template-columns: 42px 1fr;
    column-gap: 14px;
  }

  .step-number {
    width: 34px;
    height: 34px;
  }

  .human-copy > p:not(.eyebrow) {
    font-size: 15px;
  }

  .human-copy > .human-strong {
    font-size: 17px;
  }

  .human-system {
    min-height: 385px;
    padding-right: 14px;
    padding-left: 14px;
  }

  .system-axis-label {
    left: 14px;
    font-size: 8px;
  }

  .system-lane {
    min-height: 104px;
  }

  .lane-steps {
    gap: 4px;
    padding-right: 5px;
    padding-left: 5px;
    font-size: 10px;
  }

  .lane-steps i {
    font-size: 14px;
  }

  .principle-row {
    grid-template-columns: 34px 1fr 18px;
    gap: 9px;
    padding: 22px 0;
  }

  .principle-row h3 {
    font-size: 16px;
  }

  .principle-row h3 em {
    display: block;
    margin: 4px 0 0;
    font-size: 10px;
  }

  .principle-row p {
    font-size: 11px;
  }

  .contact-block {
    padding: 95px 0 72px;
  }

  .site-footer {
    display: grid;
    gap: 22px;
    padding-bottom: 10px;
  }

  .site-footer > div:last-child {
    text-align: left;
  }
}

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

  *,
  *::before,
  *::after {
    animation-duration: 0.001ms !important;
    animation-iteration-count: 1 !important;
    scroll-behavior: auto !important;
    transition-duration: 0.001ms !important;
  }

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