:root {
  --blue: #1947e5;
  --navy: #11255b;
  --ink: #152a54;
  --muted: #54617a;
  --paper: #f3f4f6;
  --white: #fff;
  --line: #d0d7e3;
  --ease: cubic-bezier(0.16, 1, 0.3, 1);
  font-family:
    "Microsoft YaHei UI", "Microsoft YaHei", "PingFang SC", sans-serif;
  color: var(--ink);
  background: var(--paper);
  font-synthesis: none;
  color-scheme: light;
}
* {
  box-sizing: border-box;
}
html {
  scroll-behavior: smooth;
  scroll-padding-top: 90px;
  scrollbar-color: var(--blue) var(--paper);
}
body {
  margin: 0;
  line-height: 1.75;
}
button,
a {
  -webkit-tap-highlight-color: transparent;
}
button {
  font: inherit;
  cursor: pointer;
}
button[hidden] {
  display: none;
}
a {
  color: inherit;
  text-decoration: none;
  text-underline-offset: 6px;
}
a:focus-visible,
button:focus-visible {
  outline: 3px solid currentColor;
  outline-offset: 7px;
}
::selection {
  background: #bfe9ff;
  color: #102867;
}
h1,
h2,
h3,
p,
figure {
  margin: 0;
}
h1,
h2,
h3 {
  font-weight: 500;
  letter-spacing: -0.035em;
}
svg {
  fill: none;
  stroke: currentColor;
  stroke-width: 1.5;
}
.icon {
  width: 23px;
  height: 23px;
  flex: 0 0 auto;
}
.sr-only {
  position: absolute;
  width: 1px;
  height: 1px;
  overflow: hidden;
  clip-path: inset(50%);
  white-space: nowrap;
}
.skip-link {
  position: fixed;
  z-index: 100;
  top: 12px;
  left: 16px;
  padding: 12px 20px;
  background: white;
  color: var(--blue);
  transform: translateY(-150%);
}
.skip-link:focus {
  transform: none;
}
.section-pad {
  padding-inline: 5.5%;
}

/* Brand and navigation */
.site-header {
  position: absolute;
  inset: 0 0 auto;
  height: 96px;
  padding: 0 3.5%;
  display: flex;
  align-items: center;
  gap: 36px;
  color: white;
  z-index: 20;
  border-bottom: 1px solid #ffffff38;
}
.brand {
  display: flex;
  align-items: center;
  gap: 13px;
  margin-right: auto;
  font-family: Bahnschrift, sans-serif;
  font-size: 25px;
  font-weight: 500;
  line-height: 1.1;
}
.brand-mark {
  width: 45px;
  height: 45px;
  stroke-width: 2.8;
}
.brand-cn {
  display: block;
  margin-top: 7px;
  font:
    10px/1.2 "Microsoft YaHei UI",
    sans-serif;
  letter-spacing: 0.2em;
}
nav {
  display: flex;
  align-items: center;
  gap: 37px;
  font-size: 13px;
}
nav a {
  position: relative;
  display: flex;
  gap: 15px;
  align-items: center;
  padding-block: 8px;
}
nav a::after {
  content: "";
  position: absolute;
  bottom: 0;
  left: 0;
  width: 100%;
  height: 1px;
  background: currentColor;
  transform: scaleX(0);
  transform-origin: right;
  transition: transform 0.4s var(--ease);
}
nav a:hover::after {
  transform: scaleX(1);
  transform-origin: left;
}
nav .icon {
  width: 15px;
  height: 15px;
}
.motion-toggle {
  width: 36px;
  height: 36px;
  border: 1px solid #ffffff66;
  border-radius: 50%;
  display: grid;
  place-items: center;
  padding: 0;
  background: transparent;
  color: inherit;
}
.motion-toggle:hover {
  background: #ffffff20;
}
.motion-toggle .icon {
  width: 20px;
  height: 20px;
}
.play-icon {
  display: none;
}
.motion-toggle[aria-pressed="true"] .play-icon {
  display: block;
}
.motion-toggle[aria-pressed="true"] .pause-icon {
  display: none;
}
.reading-progress {
  position: fixed;
  top: 0;
  left: 0;
  width: 100%;
  height: 3px;
  transform: scaleX(0);
  transform-origin: left;
  background: #92e5f9;
  pointer-events: none;
}

/* A full-bleed blue field, an interlocking wire symbol and oversized wordmark. */
.hero {
  display: flex;
  flex-direction: column;
  min-height: 920px;
  height: max(920px, 100svh);
  max-height: 1180px;
  position: relative;
  overflow: clip;
  color: white;
  background: var(--blue);
  padding: 126px 3.5% 0;
}
.hero-topline {
  display: flex;
  flex-shrink: 0;
  justify-content: space-between;
  font-size: 11px;
  color: #d0dcff;
  letter-spacing: 0.08em;
}
.hero-topline span:last-child {
  font-family: Bahnschrift, sans-serif;
  letter-spacing: 0.12em;
}
.hero-content {
  position: relative;
  flex: 1;
  min-height: 435px;
  display: grid;
  grid-template-columns: 43% 57%;
  align-items: center;
}
.hero-copy {
  position: relative;
  z-index: 2;
  padding: 32px 0 25px 2.2vw;
}
.hero h1 {
  font-size: clamp(42px, 4.3vw, 69px);
  line-height: 1.3;
  letter-spacing: -0.04em;
}
.line {
  display: block;
  overflow: clip;
  padding-bottom: 0.05em;
}
.line > span {
  display: block;
}
.hero-copy p {
  font-size: 14px;
  line-height: 1.9;
  color: #d7e2ff;
  margin-top: 22px;
}
.round-link {
  display: inline-flex;
  align-items: center;
  gap: 34px;
  font-size: 14px;
}
.hero-link {
  margin-top: 25px;
}
.arrow-disc {
  width: 43px;
  height: 43px;
  display: grid;
  place-items: center;
  border: 1px solid #ffffff8f;
  border-radius: 50%;
  transition:
    background 0.3s,
    color 0.3s,
    transform 0.5s var(--ease);
}
.round-link:hover .arrow-disc {
  color: var(--blue);
  background: white;
  transform: rotate(45deg);
}
.arrow-disc .icon {
  width: 17px;
  height: 17px;
}
.hero-art {
  position: absolute;
  right: -1vw;
  top: -38px;
  width: 65%;
  height: 116%;
  display: grid;
  place-items: center;
  isolation: isolate;
}
#symbol-canvas {
  width: 100%;
  height: 100%;
  position: absolute;
  inset: 0;
  z-index: 2;
}
.symbol-still {
  position: absolute;
  width: 45%;
  height: auto;
  transform: rotate(-15deg);
}
.canvas-ready .symbol-still {
  visibility: hidden;
}
.art-orbit {
  position: absolute;
  width: 70%;
  height: 70%;
  border: 1px solid #ffffff22;
  border-radius: 50%;
  transform: rotate(-25deg) scaleY(0.56);
  pointer-events: none;
}
.orbit-two {
  width: 90%;
  height: 90%;
  transform: rotate(25deg) scaleY(0.55);
}
.art-cross {
  position: absolute;
  width: 15px;
  height: 15px;
  opacity: 0.55;
}
.art-cross::before,
.art-cross::after {
  content: "";
  position: absolute;
  background: white;
}
.art-cross::before {
  top: 7px;
  width: 15px;
  height: 1px;
}
.art-cross::after {
  left: 7px;
  width: 1px;
  height: 15px;
}
.cross-top {
  top: 5%;
  right: 12%;
}
.cross-bottom {
  bottom: 12%;
  left: 15%;
}
.hero-bottom {
  position: relative;
  z-index: 3;
  display: flex;
  flex-shrink: 0;
  align-items: center;
  justify-content: space-between;
  padding: 15px 0;
  margin-top: 10px;
  font-size: 10px;
  letter-spacing: 0.06em;
}
.scroll-link {
  display: flex;
  align-items: center;
  gap: 14px;
}
.scroll-marker {
  height: 33px;
  width: 19px;
  border: 1px solid #ffffff8f;
  border-radius: 14px;
  display: flex;
  justify-content: center;
}
.scroll-marker > span {
  width: 2px;
  height: 8px;
  margin-top: 7px;
  background: white;
}
.hero-index {
  font-family: Bahnschrift, sans-serif;
}
.hero-wordmark {
  position: relative;
  display: flex;
  align-items: baseline;
  white-space: nowrap;
  font-family: Bahnschrift, Arial, sans-serif;
  font-weight: 600;
  font-size: 19.3vw;
  flex-shrink: 0;
  line-height: 1.03;
  letter-spacing: -0.04em;
  margin-left: -0.008em;
  transform-origin: bottom left;
}
.wordmark-x {
  color: #a6ecff;
}

/* Typography bridge */
.intro {
  background: var(--paper);
  padding-block: 135px 122px;
}
.intro-heading {
  display: flex;
  align-items: center;
  justify-content: space-between;
}
.intro h2 {
  font-size: clamp(55px, 6.2vw, 96px);
  line-height: 1.3;
}
.ink-reveal {
  color: var(--blue);
  display: inline-block;
}
.intro-arrow {
  width: 120px;
  height: 120px;
  stroke: var(--blue);
  stroke-width: 1.4;
  margin-right: 5%;
}
.intro-detail {
  display: grid;
  grid-template-columns: 1fr 1fr;
  margin-top: 76px;
  padding-top: 24px;
  border-top: 1px solid var(--line);
}
.small-brand {
  font:
    11px Bahnschrift,
    "Microsoft YaHei UI",
    sans-serif;
  letter-spacing: 0.06em;
  padding-top: 12px;
}
.intro-detail p {
  font-size: clamp(20px, 2vw, 28px);
  line-height: 1.8;
}
.intro-detail p span {
  color: var(--muted);
}

/* One native scroll story: drawing on the left, three meaningful steps on the right. */
.product {
  background: #e5eaf3;
}
.product-heading {
  display: flex;
  align-items: end;
  justify-content: space-between;
  padding-top: 92px;
  padding-bottom: 66px;
}
.product-heading h2 {
  font-size: 54px;
  line-height: 1.2;
}
.product-heading h2 span {
  display: block;
  font:
    20px Bahnschrift,
    sans-serif;
  margin-top: 17px;
  letter-spacing: 0;
}
.text-link {
  display: inline-flex;
  align-items: center;
  gap: 24px;
  padding-bottom: 8px;
  font-size: 14px;
  border-bottom: 1px solid currentColor;
}
.text-link .icon {
  width: 19px;
  height: 19px;
  transition: transform 0.3s var(--ease);
}
.text-link:hover .icon {
  transform: translate(3px, -3px);
}
.product-story {
  display: grid;
  grid-template-columns: 61% 39%;
  padding-inline: 3.5% 5.5%;
  gap: 0;
  align-items: start;
}
.drawing-sticky {
  position: sticky;
  top: max(30px, calc((100vh - 650px) / 2));
  padding-bottom: 40px;
}
.drawing-stage {
  height: 610px;
  position: relative;
  display: flex;
  flex-direction: column;
  justify-content: space-between;
  overflow: hidden;
  background: var(--navy);
  color: #d5e6ff;
  padding: 24px;
}
.stage-top,
.drawing-stage figcaption {
  position: relative;
  z-index: 3;
  display: flex;
  justify-content: space-between;
  gap: 16px;
  font-size: 10px;
}
.stage-top span:last-child {
  font-family: Bahnschrift, sans-serif;
  letter-spacing: 0.12em;
}
.drawing-grid {
  position: absolute;
  inset: 0;
  background-image:
    linear-gradient(#b1d1ff0e 1px, transparent 1px),
    linear-gradient(90deg, #b1d1ff0e 1px, transparent 1px);
  background-size: 34px 34px;
}
.paper-stack {
  position: absolute;
  width: 86%;
  aspect-ratio: 1200/896;
  inset: 0;
  margin: auto;
  perspective: 1000px;
  transform: rotate(-5deg) scale(0.91);
}
.drawing-paper,
.blueprint-paper,
.paper-layer {
  position: absolute;
  inset: 0;
  background: #fff;
}
.paper-layer {
  transform: translate(-18px, 17px) rotate(-3deg);
  background: #456092;
}
.drawing-paper {
  box-shadow: 12px 30px 65px #00103d55;
}
.drawing-paper img,
.blueprint-paper img {
  display: block;
  width: 100%;
  height: 100%;
  object-fit: contain;
  padding: 12px;
}
.blueprint-paper {
  background: #1947e5;
  clip-path: inset(0 100% 0 0);
}
.blueprint-paper img {
  filter: invert(1);
  mix-blend-mode: screen;
}
.scan-line {
  position: absolute;
  top: -10px;
  bottom: -10px;
  left: 0;
  width: 1px;
  background: #96eaff;
  opacity: 0;
}
.scan-line > span {
  position: absolute;
  inset: -4px auto auto -3px;
  width: 7px;
  height: 7px;
  background: #b8f4ff;
}
.paper-corner {
  width: 18px;
  height: 18px;
  position: absolute;
  border-color: #b9dbff;
  border-style: solid;
}
.corner-a {
  top: -12px;
  left: -12px;
  border-width: 1px 0 0 1px;
}
.corner-b {
  right: -12px;
  bottom: -12px;
  border-width: 0 1px 1px 0;
}
.product-steps {
  padding-left: 20%;
}
.product-step {
  position: relative;
  min-height: 420px;
  padding: 60px 0 70px;
}
.product-step:first-child {
  padding-top: 45px;
}
.step-count {
  font-size: 11px;
  color: var(--muted);
  font-variant-numeric: tabular-nums;
}
.product-step h3 {
  font-size: 38px;
  line-height: 1.4;
  margin-top: 26px;
}
.product-step p {
  margin-top: 22px;
  color: var(--muted);
  font-size: 14px;
  line-height: 1.95;
  max-width: 30ch;
}
.step-rule {
  position: absolute;
  bottom: 28px;
  left: 0;
  width: 100%;
  height: 1px;
  background: #bdc9df;
  transform-origin: left;
}
.product-step .text-link {
  margin-top: 25px;
  color: var(--blue);
}
.format-strip {
  overflow: hidden;
  border-top: 1px solid #c5cfe1;
  padding-block: 43px 34px;
}
.format-track {
  display: flex;
  width: max-content;
  gap: 55px;
  align-items: center;
  font:
    500 clamp(72px, 9vw, 150px)/1 Bahnschrift,
    sans-serif;
  color: var(--blue);
  padding-left: 5.5vw;
}
.format-track > svg {
  width: 130px;
  height: 85px;
  stroke-width: 1.5;
}
.outline-type {
  color: transparent;
  -webkit-text-stroke: 1px var(--blue);
}
.format-track > .format-star {
  width: 95px;
  height: 95px;
  stroke-width: 2;
}

/* Company and closing contact */
.about {
  padding-block: 136px;
  display: grid;
  grid-template-columns: 1fr 1fr;
  gap: 9%;
  background: #f8f9fb;
}
.about h2 {
  font-size: clamp(48px, 5vw, 76px);
  line-height: 1.35;
}
.about h2 span {
  color: var(--blue);
}
.about-symbol {
  width: 130px;
  height: 130px;
  margin-top: 58px;
  color: var(--blue);
}
.about-symbol svg {
  width: 100%;
  height: 100%;
  stroke-width: 1;
}
.about-content {
  padding-top: 14px;
}
.about-content h3 {
  font-size: 24px;
  margin-bottom: 35px;
}
.about-content p {
  font-size: 15px;
  color: var(--muted);
  line-height: 2.1;
}
.about-content p + p {
  margin-top: 20px;
}
.about-fields {
  display: flex;
  flex-wrap: wrap;
  gap: 20px;
  border-top: 1px solid var(--line);
  margin-top: 48px;
  padding-top: 23px;
  font-size: 12px;
}
.about-fields span:not(:last-child)::after {
  content: "/";
  padding-left: 20px;
  color: #8491a8;
}
.contact {
  background: var(--blue);
  color: white;
  padding-block: 110px 68px;
}
.contact-heading {
  display: flex;
  align-items: center;
  justify-content: space-between;
}
.contact h2 {
  font-size: clamp(54px, 6.4vw, 96px);
  line-height: 1.35;
}
.contact-action {
  width: 162px;
  height: 162px;
  border: 1px solid #ffffff87;
  border-radius: 50%;
  display: grid;
  place-items: center;
  transition:
    background 0.4s,
    color 0.4s;
  margin-right: 2%;
}
.contact-action svg {
  width: 91px;
  height: 91px;
  stroke-width: 1.2;
  transition: transform 0.5s var(--ease);
}
.contact-action:hover {
  background: white;
  color: var(--blue);
}
.contact-action:hover svg {
  transform: rotate(45deg);
}
.contact-details {
  display: grid;
  grid-template-columns: 1fr 1fr auto;
  gap: 30px;
  padding-top: 30px;
  margin-top: 70px;
  border-top: 1px solid #ffffff48;
  align-items: center;
}
.contact-details > span {
  font-size: 12px;
  color: #d4dfff;
}
.contact-details a {
  font-size: 20px;
  font-family: Bahnschrift, sans-serif;
}
.contact-details a:hover {
  text-decoration: underline;
}
.site-footer {
  background: #101d40;
  color: #dce5ff;
  padding: 56px 3.5% 25px;
  overflow: clip;
}
.footer-wordmark {
  font:
    500 16.9vw/1.06 Bahnschrift,
    sans-serif;
  white-space: nowrap;
  letter-spacing: -0.04em;
  color: #b9c6e5;
  transform-origin: center;
}
.footer-bottom {
  display: flex;
  align-items: center;
  justify-content: space-between;
  gap: 30px;
  padding-top: 45px;
  font-size: 11px;
  color: #b6c3df;
}
.footer-bottom > a:hover {
  color: white;
}
.back-top {
  display: flex;
  align-items: center;
  gap: 14px;
}
.back-top .icon {
  width: 17px;
  height: 17px;
}
.error-page {
  min-height: 100vh;
  padding: 15vh 7%;
  background: var(--blue);
  color: white;
}
.error-page h1 {
  font-size: 60px;
  margin-bottom: 28px;
}
.error-page p {
  margin-bottom: 40px;
}

/* Motion is enabled only after JS is ready; all content is visible without it. */
html[data-motion="on"] .hero-copy .line > span {
  animation: type-enter 1.1s var(--ease) both;
}
html[data-motion="on"] .hero-copy .line:nth-child(2) > span {
  animation-delay: 0.09s;
}
html[data-motion="on"] .hero-copy .line:nth-child(3) > span {
  animation-delay: 0.18s;
}
html[data-motion="on"] .hero-wordmark {
  animation: brand-enter 1.3s 0.16s var(--ease) both;
}
html[data-motion="on"] .scroll-marker > span {
  animation: scroll-cue 2s ease-in-out infinite;
}
html[data-motion="off"] *,
html[data-motion="off"] *::before,
html[data-motion="off"] *::after {
  animation: none !important;
  transition: none !important;
}
html[data-motion="off"] {
  scroll-behavior: auto;
}
@keyframes type-enter {
  from {
    transform: translateY(55%);
    clip-path: inset(0 0 55%);
  }
  to {
    transform: none;
    clip-path: inset(0);
  }
}
@keyframes brand-enter {
  from {
    transform: translateY(65px);
    letter-spacing: -0.015em;
  }
  to {
    transform: none;
    letter-spacing: -0.04em;
  }
}
@keyframes scroll-cue {
  0%,
  100% {
    transform: translateY(0);
    opacity: 1;
  }
  65% {
    transform: translateY(9px);
    opacity: 0.25;
  }
}
@media (max-width: 1200px) {
  .hero {
    min-height: 840px;
    height: max(840px, 100svh);
  }
  .hero-content {
    min-height: 410px;
  }
  .hero h1 {
    font-size: 48px;
  }
  .hero-art {
    width: 65%;
    right: -3%;
  }
  .drawing-stage {
    height: 510px;
  }
  .drawing-sticky {
    top: max(35px, calc((100vh - 550px) / 2));
  }
  .product-steps {
    padding-left: 15%;
  }
  .product-step h3 {
    font-size: 32px;
  }
  .product-step {
    min-height: 400px;
  }
  .contact-details a {
    font-size: 18px;
  }
}
@media (prefers-reduced-motion: reduce) {
  html {
    scroll-behavior: auto;
  }
  *,
  *::before,
  *::after {
    animation: none !important;
    transition: none !important;
  }
}