:root {
  --ink: #17201f;
  --muted: #5f6d69;
  --soft: #f4f7f4;
  --paper: #fbfcfa;
  --line: rgba(23, 32, 31, 0.12);
  --teal: #0f8a83;
  --teal-dark: #075e5c;
  --mint: #dff2ed;
  --gold: #c8903f;
  --clay: #d8c4aa;
  --white: #ffffff;
  --shadow: 0 24px 80px rgba(11, 42, 39, 0.12);
}

* {
  box-sizing: border-box;
}

html {
  scroll-behavior: smooth;
}

body {
  margin: 0;
  color: var(--ink);
  background: var(--paper);
  font-family: "Microsoft YaHei", "PingFang SC", "Noto Sans CJK SC", Arial, sans-serif;
  line-height: 1.6;
}

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

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

button {
  font: inherit;
}

.container {
  width: min(1160px, calc(100% - 40px));
  margin: 0 auto;
}

.site-header {
  position: fixed;
  z-index: 30;
  top: 0;
  left: 0;
  right: 0;
  display: flex;
  align-items: center;
  justify-content: space-between;
  gap: 24px;
  min-height: 76px;
  padding: 14px clamp(20px, 4vw, 54px);
  color: var(--white);
  transition: background 220ms ease, color 220ms ease, box-shadow 220ms ease;
}

.site-header.is-scrolled,
.site-header.is-open {
  color: var(--ink);
  background: rgba(251, 252, 250, 0.92);
  box-shadow: 0 10px 34px rgba(23, 32, 31, 0.08);
  backdrop-filter: blur(18px);
}

.brand {
  display: inline-flex;
  align-items: center;
  gap: 10px;
  min-width: 0;
}

.brand-mark {
  width: 42px;
  height: 42px;
  object-fit: contain;
  border-radius: 50%;
  background: rgba(255, 255, 255, 0.88);
}

.brand strong,
.brand small {
  display: block;
}

.brand strong {
  font-size: 18px;
  letter-spacing: 0;
  line-height: 1.1;
}

.brand small {
  margin-top: 2px;
  font-size: 10px;
  color: currentColor;
  opacity: 0.72;
}

.site-nav {
  display: flex;
  align-items: center;
  gap: 26px;
  font-size: 14px;
}

.site-nav a {
  position: relative;
  white-space: nowrap;
  opacity: 0.92;
}

.site-nav a::after {
  content: "";
  position: absolute;
  left: 0;
  right: 0;
  bottom: -7px;
  height: 2px;
  background: var(--teal);
  transform: scaleX(0);
  transform-origin: left;
  transition: transform 180ms ease;
}

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

.site-nav .nav-cta {
  display: inline-flex;
  align-items: center;
  min-height: 40px;
  padding: 0 18px;
  color: var(--white);
  background: var(--teal);
  border-radius: 999px;
  opacity: 1;
}

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

.nav-toggle {
  display: none;
  width: 44px;
  height: 44px;
  padding: 0;
  color: currentColor;
  background: rgba(255, 255, 255, 0.12);
  border: 1px solid rgba(255, 255, 255, 0.28);
  border-radius: 999px;
}

.nav-toggle span {
  display: block;
  width: 18px;
  height: 2px;
  margin: 5px auto;
  background: currentColor;
}

.hero {
  position: relative;
  min-height: 88svh;
  color: var(--white);
  overflow: hidden;
}

.hero-bg,
.hero-overlay {
  position: absolute;
  inset: 0;
}

.hero-bg {
  background-image: url("./assets/hero-lightcone.webp");
  background-position: center;
  background-size: cover;
  transform: scale(1.01);
}

.hero-overlay {
  background:
    linear-gradient(90deg, rgba(9, 21, 22, 0.83) 0%, rgba(9, 21, 22, 0.62) 32%, rgba(9, 21, 22, 0.18) 70%, rgba(9, 21, 22, 0.06) 100%),
    linear-gradient(0deg, rgba(10, 24, 24, 0.68) 0%, rgba(10, 24, 24, 0) 36%);
}

.hero-content {
  position: relative;
  z-index: 1;
  display: flex;
  flex-direction: column;
  justify-content: center;
  min-height: 88svh;
  padding-top: 100px;
  padding-bottom: 70px;
}

.eyebrow {
  margin: 0 0 14px;
  color: var(--teal);
  font-size: 13px;
  font-weight: 700;
  letter-spacing: 0;
  text-transform: uppercase;
}

.hero .eyebrow {
  color: #a8eee6;
}

.hero h1 {
  margin: 0;
  max-width: 680px;
  font-size: clamp(56px, 8vw, 112px);
  line-height: 0.95;
  letter-spacing: 0;
}

.hero-line {
  margin: 24px 0 0;
  max-width: 680px;
  font-size: clamp(23px, 3vw, 38px);
  line-height: 1.2;
  font-weight: 700;
}

.hero-copy {
  max-width: 660px;
  margin: 22px 0 0;
  color: rgba(255, 255, 255, 0.86);
  font-size: clamp(16px, 1.8vw, 19px);
}

.hero-actions,
.contact-actions {
  display: flex;
  flex-wrap: wrap;
  gap: 14px;
}

.hero-actions {
  margin-top: 34px;
}

.button {
  display: inline-flex;
  align-items: center;
  justify-content: center;
  gap: 9px;
  min-height: 48px;
  padding: 0 22px;
  border-radius: 999px;
  font-weight: 700;
  transition: transform 180ms ease, box-shadow 180ms ease, background 180ms ease;
}

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

.button.primary {
  color: var(--white);
  background: var(--teal);
  box-shadow: 0 18px 46px rgba(15, 138, 131, 0.32);
}

.button.secondary {
  color: var(--white);
  border: 1px solid rgba(255, 255, 255, 0.48);
  background: rgba(255, 255, 255, 0.1);
  backdrop-filter: blur(14px);
}

.button.secondary.dark {
  color: var(--ink);
  border-color: rgba(23, 32, 31, 0.18);
  background: var(--white);
}

.signal-strip {
  display: grid;
  grid-template-columns: repeat(4, minmax(96px, 1fr));
  gap: 1px;
  width: min(720px, 100%);
  margin: 46px 0 0;
  padding: 0;
  overflow: hidden;
  border: 1px solid rgba(255, 255, 255, 0.18);
  border-radius: 8px;
  background: rgba(255, 255, 255, 0.16);
  backdrop-filter: blur(16px);
}

.signal-strip div {
  padding: 18px;
  background: rgba(10, 24, 24, 0.28);
}

.signal-strip dt {
  font-size: 24px;
  font-weight: 800;
  line-height: 1;
}

.signal-strip dd {
  margin: 8px 0 0;
  color: rgba(255, 255, 255, 0.76);
  font-size: 13px;
}

.section {
  padding: clamp(72px, 9vw, 124px) 0;
}

.intro-section {
  padding-top: clamp(48px, 7vw, 84px);
  background: var(--paper);
}

.intro-grid {
  display: grid;
  grid-template-columns: minmax(240px, 0.85fr) minmax(280px, 1.15fr);
  gap: clamp(34px, 7vw, 92px);
  align-items: start;
}

h2 {
  margin: 0;
  font-size: clamp(32px, 4.8vw, 58px);
  line-height: 1.08;
  letter-spacing: 0;
}

h3 {
  margin: 0;
  font-size: 21px;
  line-height: 1.28;
  letter-spacing: 0;
}

p {
  margin: 0;
}

.intro-copy {
  color: var(--muted);
  font-size: clamp(17px, 2vw, 22px);
}

.intro-copy p + p {
  margin-top: 18px;
}

.section-heading {
  max-width: 790px;
  margin-bottom: 42px;
}

.section-heading.compact {
  max-width: 720px;
  margin-bottom: 36px;
}

.section-heading p:not(.eyebrow) {
  margin-top: 18px;
  color: var(--muted);
  font-size: 18px;
}

.technology-section {
  background: #edf5f1;
}

.tech-grid {
  display: grid;
  grid-template-columns: repeat(2, minmax(0, 1fr));
  gap: 22px;
}

.tech-item,
.product-card,
.scenario-grid article,
.timeline article {
  border: 1px solid var(--line);
  border-radius: 8px;
  background: rgba(255, 255, 255, 0.82);
}

.tech-item {
  overflow: hidden;
  min-height: 0;
  box-shadow: 0 18px 56px rgba(23, 32, 31, 0.08);
}

.tech-media {
  margin: 0;
  aspect-ratio: 16 / 10;
  overflow: hidden;
  background: #dfe9e5;
  border-bottom: 1px solid var(--line);
}

.tech-media img {
  width: 100%;
  height: 100%;
  object-fit: cover;
  transition: transform 380ms ease;
}

.tech-item:hover .tech-media img {
  transform: scale(1.035);
}

.tech-body {
  padding: 24px 26px 28px;
}

.tech-index {
  display: inline-flex;
  margin-bottom: 16px;
  color: var(--teal);
  font-size: 13px;
  font-weight: 800;
}

.tech-item p,
.product-card p,
.scenario-grid p,
.timeline p,
.feature-list p,
.research-layout p {
  margin-top: 14px;
  color: var(--muted);
}

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

.product-grid {
  display: grid;
  grid-template-columns: 1.15fr 1fr 1fr;
  gap: 18px;
}

.product-card {
  min-height: 390px;
  padding: 30px;
  box-shadow: 0 16px 44px rgba(23, 32, 31, 0.06);
}

.product-card.featured {
  color: var(--white);
  border-color: transparent;
  background:
    linear-gradient(135deg, rgba(7, 94, 92, 0.96), rgba(22, 137, 122, 0.94)),
    var(--teal-dark);
}

.product-card.featured p,
.product-card.featured li {
  color: rgba(255, 255, 255, 0.82);
}

.product-kicker {
  color: var(--teal);
  font-size: 13px;
  font-weight: 800;
}

.product-card.featured .product-kicker {
  color: #baf5e8;
}

.product-card h3 {
  margin-top: 22px;
  font-size: 34px;
}

.product-card ul {
  display: grid;
  gap: 10px;
  margin: 30px 0 0;
  padding: 0;
  list-style: none;
}

.product-card li {
  position: relative;
  padding-left: 22px;
  color: var(--muted);
}

.product-card li::before {
  content: "";
  position: absolute;
  top: 0.72em;
  left: 0;
  width: 8px;
  height: 8px;
  border-radius: 50%;
  background: var(--gold);
}

.platform-row {
  display: grid;
  grid-template-columns: repeat(3, minmax(0, 1fr));
  gap: 18px;
  margin-top: 18px;
}

.platform-row div {
  display: grid;
  gap: 8px;
  padding: 22px;
  border-top: 3px solid var(--clay);
  background: #f4eee5;
}

.platform-row strong {
  font-size: 18px;
}

.platform-row span {
  color: #6f5f4d;
  font-size: 15px;
}

.feature-section {
  background: #101a18;
  color: var(--white);
}

.feature-layout {
  display: grid;
  grid-template-columns: 0.85fr 1.15fr;
  gap: clamp(34px, 7vw, 90px);
  align-items: start;
}

.feature-layout > div > p:not(.eyebrow) {
  margin-top: 20px;
  color: rgba(255, 255, 255, 0.72);
  font-size: 18px;
}

.feature-list {
  display: grid;
  gap: 1px;
  overflow: hidden;
  border: 1px solid rgba(255, 255, 255, 0.14);
  border-radius: 8px;
  background: rgba(255, 255, 255, 0.14);
}

.feature-list article {
  padding: 24px;
  background: rgba(255, 255, 255, 0.06);
}

.feature-list p {
  color: rgba(255, 255, 255, 0.68);
}

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

.scenario-grid {
  display: grid;
  grid-template-columns: repeat(4, minmax(0, 1fr));
  gap: 18px;
}

.scenario-grid article {
  min-height: 300px;
  padding: 26px;
}

.scenario-grid span {
  display: inline-flex;
  margin-bottom: 28px;
  color: var(--gold);
  font-size: 13px;
  font-weight: 800;
}

.research-section {
  background: #eff7f6;
}

.research-layout {
  display: grid;
  grid-template-columns: minmax(280px, 0.95fr) minmax(300px, 1.05fr);
  gap: clamp(34px, 7vw, 86px);
  align-items: start;
}

.research-layout p {
  font-size: 17px;
}

.medical-note {
  display: inline-flex;
  margin-top: 22px;
  padding: 12px 14px;
  color: #5e4f40;
  background: #fff3df;
  border-left: 4px solid var(--gold);
  border-radius: 6px;
}

.validation-steps {
  display: grid;
  gap: 14px;
  margin: 0;
  padding: 0;
  list-style: none;
  counter-reset: step;
}

.validation-steps li {
  position: relative;
  min-height: 116px;
  padding: 22px 22px 22px 76px;
  border: 1px solid rgba(15, 138, 131, 0.16);
  border-radius: 8px;
  background: rgba(255, 255, 255, 0.88);
}

.validation-steps li::before {
  counter-increment: step;
  content: counter(step);
  position: absolute;
  top: 22px;
  left: 22px;
  display: grid;
  place-items: center;
  width: 34px;
  height: 34px;
  color: var(--white);
  font-weight: 800;
  background: var(--teal);
  border-radius: 50%;
}

.validation-steps span {
  display: block;
  margin-top: 8px;
  color: var(--muted);
}

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

.timeline {
  display: grid;
  grid-template-columns: repeat(4, minmax(0, 1fr));
  gap: 18px;
}

.timeline article {
  min-height: 250px;
  padding: 26px;
}

.timeline time {
  display: inline-flex;
  margin-bottom: 30px;
  color: var(--teal-dark);
  font-size: 30px;
  font-weight: 900;
  line-height: 1;
}

.contact-section {
  padding: clamp(56px, 8vw, 90px) 0;
  color: var(--white);
  background:
    linear-gradient(90deg, rgba(7, 94, 92, 0.98), rgba(22, 137, 122, 0.92)),
    var(--teal-dark);
}

.contact-section .eyebrow {
  color: #c5f5ea;
}

.contact-layout {
  display: grid;
  grid-template-columns: minmax(280px, 1fr) auto;
  gap: 28px;
  align-items: center;
}

.contact-layout p:not(.eyebrow) {
  max-width: 760px;
  margin-top: 16px;
  color: rgba(255, 255, 255, 0.78);
  font-size: 18px;
}

.site-footer {
  padding: 34px 0;
  background: var(--white);
  border-top: 1px solid var(--line);
}

.footer-layout {
  display: grid;
  grid-template-columns: 150px minmax(220px, 1fr) auto;
  gap: 24px;
  align-items: center;
}

.footer-brand img {
  width: 132px;
}

.footer-layout p {
  color: var(--muted);
}

.footer-slogan {
  text-align: right;
  white-space: nowrap;
}

@media (max-width: 980px) {
  .nav-toggle {
    display: inline-block;
  }

  .site-nav {
    position: fixed;
    top: 76px;
    left: 14px;
    right: 14px;
    display: none;
    flex-direction: column;
    align-items: stretch;
    gap: 0;
    padding: 10px;
    color: var(--ink);
    background: rgba(255, 255, 255, 0.96);
    border: 1px solid var(--line);
    border-radius: 8px;
    box-shadow: var(--shadow);
  }

  .site-nav.is-open {
    display: flex;
  }

  .site-nav a {
    padding: 13px 12px;
  }

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

  .site-nav .nav-cta {
    justify-content: center;
    margin-top: 6px;
  }

  .hero-bg {
    background-position: 60% center;
  }

  .hero-overlay {
    background:
      linear-gradient(90deg, rgba(9, 21, 22, 0.9) 0%, rgba(9, 21, 22, 0.72) 44%, rgba(9, 21, 22, 0.2) 100%),
      linear-gradient(0deg, rgba(10, 24, 24, 0.72) 0%, rgba(10, 24, 24, 0) 40%);
  }

  .intro-grid,
  .feature-layout,
  .research-layout,
  .contact-layout {
    grid-template-columns: 1fr;
  }

  .tech-grid,
  .scenario-grid,
  .timeline {
    grid-template-columns: repeat(2, minmax(0, 1fr));
  }

  .product-grid {
    grid-template-columns: 1fr;
  }

  .product-card {
    min-height: auto;
  }

  .platform-row {
    grid-template-columns: 1fr;
  }

  .contact-actions {
    justify-content: flex-start;
  }

  .footer-layout {
    grid-template-columns: 120px 1fr;
  }

  .footer-slogan {
    grid-column: 1 / -1;
    text-align: left;
    white-space: normal;
  }
}

@media (max-width: 640px) {
  .container {
    width: min(100% - 28px, 1160px);
  }

  .site-header {
    min-height: 68px;
    padding: 10px 14px;
  }

  .brand strong {
    font-size: 16px;
  }

  .brand small {
    display: none;
  }

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

  .site-nav {
    top: 68px;
  }

  .hero {
    min-height: 86svh;
  }

  .hero-bg {
    background-position: 65% center;
  }

  .hero-content {
    min-height: 86svh;
    padding-top: 96px;
    padding-bottom: 42px;
  }

  .hero h1 {
    font-size: clamp(46px, 15vw, 68px);
  }

  .hero-line {
    font-size: 24px;
  }

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

  .hero-actions,
  .contact-actions {
    align-items: stretch;
    flex-direction: column;
  }

  .button {
    width: 100%;
  }

  .signal-strip {
    grid-template-columns: repeat(2, minmax(0, 1fr));
    margin-top: 30px;
  }

  .signal-strip div {
    padding: 14px;
  }

  .section {
    padding: 62px 0;
  }

  h2 {
    font-size: 34px;
  }

  .tech-grid,
  .scenario-grid,
  .timeline {
    grid-template-columns: 1fr;
  }

  .tech-item,
  .scenario-grid article,
  .timeline article {
    min-height: auto;
  }

  .tech-index {
    margin-bottom: 32px;
  }

  .product-card {
    padding: 24px;
  }

  .product-card h3 {
    font-size: 31px;
  }

  .validation-steps li {
    padding: 68px 18px 20px;
  }

  .validation-steps li::before {
    left: 18px;
  }

  .footer-layout {
    grid-template-columns: 1fr;
  }

  .footer-brand img {
    width: 118px;
  }
}

@media (prefers-reduced-motion: reduce) {
  *,
  *::before,
  *::after {
    scroll-behavior: auto !important;
    transition: none !important;
  }
}