:root {
  --ink: #08111d;
  --ink-soft: #455363;
  --navy: #07111f;
  --navy-2: #0b1d30;
  --cyan: #43d5df;
  --cyan-deep: #1386a6;
  --paper: #f4f7f8;
  --white: #ffffff;
  --line: rgba(8, 17, 29, 0.14);
  --line-dark: rgba(255, 255, 255, 0.16);
  --container: 1200px;
  --shadow: 0 24px 70px rgba(2, 15, 28, 0.12);
}

* {
  box-sizing: border-box;
}

html {
  scroll-behavior: smooth;
}

body {
  margin: 0;
  color: var(--ink);
  background: var(--paper);
  font-family: "Noto Sans SC", "Microsoft YaHei", "PingFang SC", system-ui, sans-serif;
  line-height: 1.7;
  -webkit-font-smoothing: antialiased;
}

body.nav-open {
  overflow: hidden;
}

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

button,
a {
  -webkit-tap-highlight-color: transparent;
}

img,
svg {
  display: block;
}

.container {
  width: min(calc(100% - 48px), var(--container));
  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: 200;
  left: 16px;
  top: 12px;
  padding: 10px 16px;
  color: var(--navy);
  background: var(--cyan);
  transform: translateY(-150%);
}

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

.site-header {
  position: fixed;
  z-index: 100;
  top: 0;
  right: 0;
  left: 0;
  height: 84px;
  color: var(--white);
  border-bottom: 1px solid rgba(255, 255, 255, 0.1);
  transition: height 240ms ease, background 240ms ease, box-shadow 240ms ease;
}

.site-header.is-scrolled {
  height: 72px;
  background: rgba(7, 17, 31, 0.92);
  box-shadow: 0 12px 40px rgba(0, 0, 0, 0.15);
  backdrop-filter: blur(16px);
}

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

.brand {
  display: inline-flex;
  align-items: center;
  flex: 0 0 auto;
}

.brand-logo {
  width: 218px;
  height: auto;
}

.site-nav {
  display: flex;
  align-items: center;
  gap: 34px;
  font-size: 14px;
}

.site-nav a {
  position: relative;
  opacity: 0.78;
  transition: opacity 180ms ease;
}

.site-nav a:hover,
.site-nav a:focus-visible {
  opacity: 1;
}

.site-nav a:not(.nav-contact)::after {
  position: absolute;
  right: 0;
  bottom: -8px;
  left: 0;
  height: 1px;
  content: "";
  background: var(--cyan);
  transform: scaleX(0);
  transform-origin: right;
  transition: transform 180ms ease;
}

.site-nav a:not(.nav-contact):hover::after,
.site-nav a:not(.nav-contact):focus-visible::after {
  transform: scaleX(1);
  transform-origin: left;
}

.nav-contact {
  padding: 9px 18px;
  border: 1px solid rgba(255, 255, 255, 0.45);
  border-radius: 999px;
}

.nav-toggle {
  display: none;
  width: 44px;
  height: 44px;
  padding: 11px;
  color: inherit;
  background: transparent;
  border: 0;
}

.nav-toggle > span:not(.sr-only) {
  display: block;
  width: 22px;
  height: 1px;
  margin: 5px 0;
  background: currentColor;
  transition: transform 200ms ease, opacity 200ms ease;
}

.hero {
  position: relative;
  min-height: 780px;
  overflow: hidden;
  color: var(--white);
  background: var(--navy);
}

.hero-visual {
  position: absolute;
  inset: 0;
  background:
    linear-gradient(90deg, rgba(7, 17, 31, 0.98) 0%, rgba(7, 17, 31, 0.88) 27%, rgba(7, 17, 31, 0.34) 62%, rgba(7, 17, 31, 0.08) 100%),
    linear-gradient(0deg, rgba(7, 17, 31, 0.74) 0%, transparent 40%),
    url("assets/images/hero-precision-control.jpg") 58% center / cover no-repeat;
}

.hero-grid {
  position: absolute;
  inset: 0;
  opacity: 0.15;
  background-image:
    linear-gradient(rgba(255, 255, 255, 0.18) 1px, transparent 1px),
    linear-gradient(90deg, rgba(255, 255, 255, 0.18) 1px, transparent 1px);
  background-size: 88px 88px;
  mask-image: linear-gradient(90deg, #000 0%, transparent 66%);
}

.hero-content {
  position: relative;
  z-index: 1;
  display: grid;
  grid-template-columns: 1fr 0.7fr;
  align-items: end;
  min-height: 780px;
  padding: 172px 0 74px;
}

.hero-copy {
  max-width: 680px;
  min-width: 0;
}

.eyebrow {
  margin: 0 0 24px;
  color: var(--cyan);
  font-size: 12px;
  font-weight: 700;
  letter-spacing: 0.24em;
}

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

.hero h1 {
  margin: 0;
  font-size: clamp(58px, 7.2vw, 104px);
  font-weight: 600;
  line-height: 1.08;
  letter-spacing: -0.04em;
}

.hero-lead {
  max-width: 620px;
  margin: 32px 0 0;
  color: rgba(255, 255, 255, 0.76);
  font-size: 18px;
  line-height: 1.9;
  overflow-wrap: anywhere;
}

.hero-actions {
  display: flex;
  flex-wrap: wrap;
  gap: 14px;
  margin-top: 38px;
}

.button {
  display: inline-flex;
  align-items: center;
  justify-content: center;
  min-height: 50px;
  padding: 0 24px;
  border: 1px solid transparent;
  font-size: 14px;
  font-weight: 650;
  letter-spacing: 0.04em;
  transition: color 180ms ease, background 180ms ease, border-color 180ms ease, transform 180ms ease;
}

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

.button-primary {
  color: var(--navy);
  background: var(--cyan);
}

.button-primary:hover,
.button-primary:focus-visible {
  background: #73e6ec;
}

.button-ghost {
  color: var(--white);
  border-color: rgba(255, 255, 255, 0.35);
  background: rgba(255, 255, 255, 0.04);
}

.button-ghost:hover,
.button-ghost:focus-visible {
  border-color: rgba(255, 255, 255, 0.8);
  background: rgba(255, 255, 255, 0.1);
}

.hero-proof {
  justify-self: end;
  width: min(100%, 360px);
  padding-bottom: 12px;
  color: rgba(255, 255, 255, 0.65);
  font-size: 13px;
}

.hero-proof p {
  margin: 0 0 18px;
}

.hero-proof-line {
  height: 1px;
  margin-bottom: 16px;
  background: linear-gradient(90deg, var(--cyan), rgba(255, 255, 255, 0.1));
}

.hero-proof span {
  color: var(--white);
  font-size: 14px;
}

.proof-strip {
  position: relative;
  z-index: 2;
  background: var(--white);
  box-shadow: var(--shadow);
}

.proof-grid {
  display: grid;
  grid-template-columns: repeat(4, 1fr);
}

.proof-item {
  display: grid;
  gap: 5px;
  min-height: 150px;
  padding: 34px 32px;
  border-right: 1px solid var(--line);
}

.proof-item:first-child {
  border-left: 1px solid var(--line);
}

.proof-item strong {
  font-size: 27px;
  font-weight: 650;
  line-height: 1.2;
  letter-spacing: -0.02em;
  color: var(--cyan-deep);
}

.proof-item span {
  color: var(--ink-soft);
  font-size: 13px;
}

.section {
  padding: 124px 0;
}

.section-heading {
  display: grid;
  grid-template-columns: 1.25fr 0.75fr;
  align-items: end;
  gap: 80px;
  margin-bottom: 64px;
}

.section-heading h2,
.precision-content h2,
.capability-intro h2,
.about-statement h2,
.contact-heading h2 {
  margin: 0;
  font-size: clamp(40px, 5vw, 66px);
  font-weight: 600;
  line-height: 1.16;
  letter-spacing: -0.04em;
}

.section-heading > p,
.capability-intro > p:last-child {
  max-width: 500px;
  margin: 0 0 6px;
  color: var(--ink-soft);
  font-size: 16px;
}

.systems-section {
  background: #f4f7f8;
}

.system-grid {
  display: grid;
  grid-template-columns: repeat(2, 1fr);
  gap: 18px;
}

.system-card {
  min-height: 390px;
  padding: 38px;
  overflow: hidden;
  color: var(--white);
  background:
    linear-gradient(135deg, rgba(5, 15, 27, 0.97), rgba(5, 24, 40, 0.78)),
    url("assets/images/system-card-texture.jpg") center / cover no-repeat;
  border: 1px solid rgba(67, 213, 223, 0.16);
  transition: transform 240ms ease, box-shadow 240ms ease, border-color 240ms ease;
}

.system-card:nth-child(2) {
  background-position: center, 72% center;
}

.system-card:nth-child(3) {
  background-position: center, left center;
}

.system-card:nth-child(4) {
  background-position: center, right center;
}

.system-card:hover {
  transform: translateY(-5px);
  border-color: rgba(67, 213, 223, 0.48);
  box-shadow: 0 24px 55px rgba(3, 18, 33, 0.22);
}

.system-card-featured {
  background:
    linear-gradient(135deg, rgba(3, 15, 28, 0.94), rgba(6, 36, 55, 0.68)),
    url("assets/images/system-card-texture.jpg") left center / cover no-repeat;
}

.system-topline {
  display: flex;
  align-items: flex-start;
  justify-content: space-between;
}

.system-topline > span {
  color: #718090;
  font-family: monospace;
  font-size: 12px;
}

.system-topline svg {
  width: 58px;
  height: 58px;
  fill: none;
  stroke: var(--cyan-deep);
  stroke-linecap: round;
  stroke-linejoin: round;
  stroke-width: 1.5;
}

.system-card-featured .system-topline svg {
  stroke: var(--cyan);
}

.system-card h3 {
  max-width: 430px;
  margin: 48px 0 16px;
  font-size: 25px;
  line-height: 1.35;
}

.system-card p {
  max-width: 500px;
  margin: 0;
  color: rgba(255, 255, 255, 0.66);
  font-size: 14px;
}

.metric-list {
  display: grid;
  grid-template-columns: repeat(2, 1fr);
  margin: 36px 0 0;
  padding: 24px 0 0;
  border-top: 1px solid var(--line-dark);
  list-style: none;
}

.metric-list li {
  display: grid;
  gap: 5px;
}

.metric-list li + li {
  padding-left: 24px;
  border-left: 1px solid var(--line-dark);
}

.metric-list strong {
  color: var(--cyan);
  font-size: 20px;
}

.system-card-featured .metric-list strong {
  color: var(--cyan);
}

.metric-list span {
  color: rgba(255, 255, 255, 0.58);
  font-size: 12px;
}

.system-card-wide {
  display: grid;
  grid-column: 1 / -1;
  grid-template-columns: 1fr 1fr;
  align-items: end;
  gap: 48px;
  min-height: 320px;
  background:
    linear-gradient(100deg, rgba(4, 18, 31, 0.95), rgba(6, 35, 52, 0.7)),
    url("assets/images/system-card-texture.jpg") center 62% / cover no-repeat;
}

.system-card-wide h3 {
  margin-top: 34px;
}

.metric-list-inline {
  grid-template-columns: repeat(3, 1fr);
}

.precision-band {
  position: relative;
  padding: 110px 0;
  overflow: hidden;
  color: var(--white);
  background: var(--navy);
}

.precision-orbit {
  position: absolute;
  top: 50%;
  right: -220px;
  width: 600px;
  height: 600px;
  border: 1px solid rgba(67, 213, 223, 0.22);
  border-radius: 50%;
  transform: translateY(-50%);
  box-shadow: 0 0 0 90px rgba(67, 213, 223, 0.04), 0 0 0 180px rgba(67, 213, 223, 0.025);
}

.precision-content {
  position: relative;
  display: grid;
  grid-template-columns: 1.1fr 0.9fr;
  align-items: end;
  gap: 100px;
}

.precision-copy {
  max-width: 500px;
}

.precision-copy p {
  margin: 0;
  color: rgba(255, 255, 255, 0.7);
  font-size: 17px;
}

.text-link {
  display: inline-flex;
  gap: 12px;
  margin-top: 28px;
  color: var(--cyan);
  font-size: 14px;
}

.text-link span {
  transition: transform 180ms ease;
}

.text-link:hover span {
  transform: translate(3px, -3px);
}

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

.section-heading-compact {
  margin-bottom: 56px;
}

.application-grid {
  display: grid;
  grid-template-columns: repeat(4, 1fr);
  border-top: 1px solid var(--line);
  border-left: 1px solid var(--line);
}

.application-card {
  min-height: 390px;
  padding: 28px;
  border-right: 1px solid var(--line);
  border-bottom: 1px solid var(--line);
}

.application-index {
  display: block;
  color: #84909b;
  font-family: monospace;
  font-size: 11px;
}

.application-icon {
  position: relative;
  width: 94px;
  height: 94px;
  margin: 52px 0 44px;
}

.orbit-icon i {
  position: absolute;
  inset: 13px;
  border: 1px solid var(--cyan-deep);
  border-radius: 50%;
}

.orbit-icon i:nth-child(2) {
  inset: 28px 5px;
  transform: rotate(45deg);
}

.orbit-icon i:nth-child(3) {
  inset: 43px;
  background: var(--cyan-deep);
  border: 0;
}

.beam-icon i {
  position: absolute;
  top: 46px;
  width: 72px;
  height: 1px;
  background: var(--cyan-deep);
}

.beam-icon i:nth-child(1) {
  left: 0;
  transform: rotate(-24deg);
}

.beam-icon i:nth-child(2) {
  right: 0;
  transform: rotate(24deg);
}

.beam-icon i:nth-child(3) {
  left: 43px;
  width: 9px;
  height: 9px;
  border-radius: 50%;
  box-shadow: 0 0 20px var(--cyan);
}

.fusion-icon i {
  position: absolute;
  inset: 15px;
  border: 1px solid var(--cyan-deep);
  border-radius: 50% 12% 50% 12%;
  transform: rotate(45deg);
}

.fusion-icon i:nth-child(2) {
  inset: 31px;
  background: var(--cyan-deep);
  border: 0;
  box-shadow: 0 0 22px rgba(67, 213, 223, 0.6);
}

.network-icon::before,
.network-icon::after {
  position: absolute;
  top: 46px;
  left: 15px;
  width: 66px;
  height: 1px;
  content: "";
  background: var(--cyan-deep);
  transform: rotate(34deg);
}

.network-icon::after {
  transform: rotate(-34deg);
}

.network-icon i {
  position: absolute;
  width: 9px;
  height: 9px;
  background: var(--white);
  border: 2px solid var(--cyan-deep);
  border-radius: 50%;
}

.network-icon i:nth-child(1) { top: 12px; left: 43px; }
.network-icon i:nth-child(2) { top: 43px; left: 8px; }
.network-icon i:nth-child(3) { top: 43px; right: 8px; }
.network-icon i:nth-child(4) { bottom: 8px; left: 43px; }

.application-card h3 {
  margin: 0 0 14px;
  font-size: 19px;
}

.application-card p {
  margin: 0;
  color: var(--ink-soft);
  font-size: 13px;
}

.capability-section {
  background: #eaf0f2;
}

.capability-layout {
  display: grid;
  grid-template-columns: 0.85fr 1.15fr;
  gap: 110px;
}

.capability-intro {
  position: sticky;
  top: 130px;
  align-self: start;
}

.capability-intro > p:last-child {
  margin-top: 30px;
}

.capability-list {
  margin: 0;
  padding: 0;
  border-top: 1px solid var(--line);
  list-style: none;
}

.capability-list li {
  display: grid;
  grid-template-columns: 72px 1fr;
  gap: 12px;
  padding: 34px 0;
  border-bottom: 1px solid var(--line);
}

.capability-list li > span {
  color: var(--cyan-deep);
  font-family: monospace;
  font-size: 12px;
}

.capability-list h3 {
  margin: 0 0 8px;
  font-size: 21px;
}

.capability-list p {
  margin: 0;
  color: var(--ink-soft);
  font-size: 14px;
}

.about-section {
  color: var(--white);
  background: #0b1928;
}

.about-layout {
  display: grid;
  grid-template-columns: 1fr 1fr;
  gap: 100px;
}

.about-copy {
  max-width: 560px;
}

.about-copy p {
  margin: 0 0 22px;
  color: rgba(255, 255, 255, 0.63);
}

.about-copy .about-lead {
  color: var(--white);
  font-size: 20px;
  line-height: 1.8;
}

.about-tags {
  display: flex;
  flex-wrap: wrap;
  gap: 10px;
  margin-top: 34px;
}

.about-tags span {
  padding: 8px 13px;
  color: rgba(255, 255, 255, 0.8);
  border: 1px solid var(--line-dark);
  border-radius: 999px;
  font-size: 12px;
}

.contact-section {
  padding: 110px 0;
  color: var(--navy);
  background: var(--cyan);
}

.contact-layout {
  display: grid;
  grid-template-columns: 1.05fr 0.95fr;
  gap: 100px;
}

.contact-heading .eyebrow {
  color: rgba(7, 17, 31, 0.58);
}

.contact-details > p {
  max-width: 500px;
  margin: 0 0 38px;
  font-size: 17px;
}

.contact-details dl {
  display: grid;
  grid-template-columns: 0.8fr 1.2fr;
  gap: 34px;
  margin: 0 0 38px;
}

.contact-details dt {
  margin-bottom: 7px;
  font-size: 12px;
  opacity: 0.58;
}

.contact-details dd {
  margin: 0;
  font-size: 17px;
  line-height: 1.6;
}

.contact-details dd a {
  font-size: 21px;
  font-weight: 700;
}

.button-light {
  color: var(--white);
  background: var(--navy);
}

.button-light:hover,
.button-light:focus-visible {
  background: #122a42;
}

.site-footer {
  padding: 34px 0;
  color: rgba(255, 255, 255, 0.55);
  background: #050b12;
}

.footer-layout {
  display: flex;
  align-items: center;
  justify-content: space-between;
  gap: 24px;
  font-size: 12px;
}

.brand-footer {
  color: var(--white);
}

.brand-footer .brand-logo {
  width: 188px;
}

.footer-meta {
  display: flex;
  align-items: center;
  flex-wrap: wrap;
  gap: 8px 20px;
}

.footer-meta p {
  margin: 0;
}

.site-footer a:hover {
  color: var(--white);
}

.js [data-reveal] {
  opacity: 0;
  transform: translateY(22px);
  transition: opacity 620ms ease, transform 620ms ease;
}

.js [data-reveal].is-visible {
  opacity: 1;
  transform: translateY(0);
}

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

@media (max-width: 980px) {
  .site-nav {
    gap: 22px;
  }

  .hero-content {
    grid-template-columns: 1fr;
    align-items: end;
  }

  .hero-proof {
    justify-self: start;
    padding-top: 48px;
  }

  .section-heading,
  .precision-content,
  .capability-layout,
  .about-layout,
  .contact-layout {
    grid-template-columns: 1fr;
    gap: 48px;
  }

  .capability-intro {
    position: static;
  }

  .application-grid {
    grid-template-columns: repeat(2, 1fr);
  }

  .contact-details {
    max-width: 650px;
  }
}

@media (max-width: 760px) {
  .container {
    width: min(calc(100% - 32px), var(--container));
  }

  .site-header,
  .site-header.is-scrolled {
    height: 68px;
  }

  .nav-toggle {
    display: block;
  }

  .brand-logo {
    width: 168px;
  }

  .nav-toggle[aria-expanded="true"] > span:nth-child(1) {
    transform: translateY(6px) rotate(45deg);
  }

  .nav-toggle[aria-expanded="true"] > span:nth-child(2) {
    opacity: 0;
  }

  .nav-toggle[aria-expanded="true"] > span:nth-child(3) {
    transform: translateY(-6px) rotate(-45deg);
  }

  .site-nav {
    position: fixed;
    inset: 68px 0 0;
    display: grid;
    align-content: start;
    height: calc(100dvh - 68px);
    overflow-y: auto;
    gap: 0;
    padding: 24px;
    background: var(--navy);
    border-top: 1px solid var(--line-dark);
    transform: translateY(-140%);
    transition: transform 240ms ease;
  }

  .site-nav.is-open {
    transform: translateY(0);
  }

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

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

  .nav-contact {
    border: 0;
    border-radius: 0;
  }

  .hero,
  .hero-content {
    min-height: 720px;
  }

  .hero-visual {
    background:
      linear-gradient(90deg, rgba(7, 17, 31, 0.96) 0%, rgba(7, 17, 31, 0.7) 100%),
      linear-gradient(0deg, rgba(7, 17, 31, 0.8) 0%, transparent 48%),
      url("assets/images/hero-precision-control.jpg") 66% center / cover no-repeat;
  }

  .hero-content {
    padding: 130px 0 48px;
  }

  .hero h1 {
    font-size: clamp(48px, 15vw, 68px);
  }

  .hero-lead {
    font-size: 16px;
  }

  .proof-grid {
    grid-template-columns: repeat(2, 1fr);
  }

  .proof-item {
    min-height: 128px;
    padding: 26px 20px;
    border-bottom: 1px solid var(--line);
  }

  .proof-item strong {
    font-size: 34px;
  }

  .section {
    padding: 88px 0;
  }

  .section-heading {
    margin-bottom: 44px;
  }

  .system-grid,
  .system-card-wide,
  .application-grid {
    grid-template-columns: 1fr;
  }

  .system-card {
    min-height: auto;
    padding: 28px;
  }

  .system-card h3 {
    margin-top: 32px;
  }

  .system-card-wide {
    gap: 10px;
  }

  .metric-list-inline {
    grid-template-columns: 1fr;
  }

  .metric-list-inline li + li {
    margin-top: 18px;
    padding: 18px 0 0;
    border-top: 1px solid var(--line);
    border-left: 0;
  }

  .precision-band {
    padding: 86px 0;
  }

  .application-card {
    min-height: 330px;
  }

  .about-copy .about-lead {
    font-size: 18px;
  }

  .contact-section {
    padding: 86px 0;
  }

  .contact-details dl {
    grid-template-columns: 1fr;
  }

  .footer-layout {
    align-items: flex-start;
    flex-direction: column;
  }
}

@media (max-width: 420px) {
  .button {
    width: 100%;
  }

  .hero-proof {
    display: none;
  }

  .metric-list {
    grid-template-columns: 1fr;
  }

  .metric-list li + li {
    margin-top: 18px;
    padding: 18px 0 0;
    border-top: 1px solid var(--line);
    border-left: 0;
  }
}

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

  *,
  *::before,
  *::after {
    scroll-behavior: auto !important;
    transition-duration: 0.01ms !important;
    animation-duration: 0.01ms !important;
    animation-iteration-count: 1 !important;
  }

  .js [data-reveal] {
    opacity: 1;
    transform: none;
  }
}