:root {
  --ink: #15181d;
  --paper: #f7f7f4;
  --white: #ffffff;
  --blue: #2457e6;
  --orange: #ff6b35;
  --muted: #68707c;
  --line: rgba(21, 24, 29, 0.14);
  --sans: Inter, ui-sans-serif, -apple-system, BlinkMacSystemFont, "Segoe UI", "PingFang SC", "Microsoft YaHei", Arial, sans-serif;
  --mono: "SFMono-Regular", Consolas, "Liberation Mono", monospace;
}

* { box-sizing: border-box; }
html { scroll-behavior: smooth; scroll-padding-top: 84px; }
body {
  margin: 0;
  background: var(--paper);
  color: var(--ink);
  font-family: var(--sans);
  -webkit-font-smoothing: antialiased;
}
a { color: inherit; text-decoration: none; }
button, a { -webkit-tap-highlight-color: transparent; }
button:focus-visible, a:focus-visible { outline: 3px solid var(--orange); outline-offset: 4px; }

.site-header {
  position: fixed;
  z-index: 50;
  inset: 0 0 auto;
  height: 84px;
  display: grid;
  grid-template-columns: 1fr auto 1fr;
  align-items: center;
  padding: 0 5vw;
  color: var(--white);
  background: rgba(21, 24, 29, 0.92);
  border-bottom: 1px solid rgba(255, 255, 255, 0.12);
  -webkit-backdrop-filter: blur(16px);
  backdrop-filter: blur(16px);
}
.brand { display: inline-flex; width: fit-content; align-items: center; gap: 14px; }
.brand-mark {
  width: 46px;
  height: 46px;
  display: block;
  border-radius: 50%;
}
.brand-name { font-size: 15px; font-weight: 780; letter-spacing: 0.13em; }
.desktop-nav { display: flex; align-items: center; gap: 34px; color: rgba(255, 255, 255, 0.65); font-size: 12px; }
.desktop-nav a, .language-switch button { transition: color 160ms ease; }
.desktop-nav a:hover, .language-switch button:hover, .language-switch button.active { color: var(--white); }
.language-switch { justify-self: end; display: flex; align-items: center; gap: 8px; color: rgba(255, 255, 255, 0.3); }
.language-switch button {
  appearance: none;
  border: 0;
  padding: 8px 1px;
  color: rgba(255, 255, 255, 0.52);
  background: transparent;
  font: inherit;
  font-size: 11px;
  font-weight: 700;
  cursor: pointer;
}

.hero {
  min-height: 820px;
  display: grid;
  grid-template-columns: minmax(0, 1.08fr) minmax(410px, 0.92fr);
  align-items: center;
  gap: 7vw;
  padding: 145px 7vw 70px;
  color: var(--white);
  background: var(--ink);
}
.hero-copy { position: relative; z-index: 2; }
.eyebrow {
  margin: 0 0 21px;
  color: var(--muted);
  font-size: 10px;
  font-weight: 760;
  letter-spacing: 0.22em;
  text-transform: uppercase;
}
.eyebrow::before { content: ""; display: inline-block; width: 22px; height: 2px; margin-right: 10px; vertical-align: middle; background: var(--orange); }
.eyebrow.light { color: rgba(255, 255, 255, 0.54); }
.hero h1 {
  max-width: 790px;
  margin: 0;
  font-size: clamp(58px, 6.7vw, 106px);
  font-weight: 610;
  line-height: 0.94;
  letter-spacing: -0.064em;
}
html[lang="zh-CN"] .hero h1 { letter-spacing: -0.04em; line-height: 1.04; }
.hero-body { max-width: 650px; margin: 34px 0 0; color: rgba(255, 255, 255, 0.66); font-size: clamp(16px, 1.4vw, 21px); line-height: 1.65; }
.hero-actions { display: flex; flex-wrap: wrap; gap: 12px; margin-top: 38px; }
.button {
  min-height: 52px;
  display: inline-flex;
  align-items: center;
  justify-content: space-between;
  gap: 22px;
  padding: 0 22px;
  border-radius: 999px;
  font-size: 12px;
  font-weight: 730;
  transition: transform 160ms ease, background 160ms ease;
}
.button:hover { transform: translateY(-2px); }
.button-primary { color: var(--white); background: var(--blue); }
.button-primary:hover { background: #3464ee; }
.button-ghost { color: var(--white); border: 1px solid rgba(255, 255, 255, 0.24); }
.button-ghost:hover { background: rgba(255, 255, 255, 0.08); }
.hero-labels { display: flex; flex-wrap: wrap; gap: 8px; margin-top: 64px; }
.hero-labels span { padding: 9px 12px; border: 1px solid rgba(255, 255, 255, 0.15); border-radius: 999px; color: rgba(255, 255, 255, 0.58); font-size: 10px; }

.bridge { position: relative; min-height: 500px; display: grid; place-items: center; }
.bridge::before, .bridge::after {
  content: "";
  position: absolute;
  border-radius: 50%;
  border: 1px solid rgba(255, 255, 255, 0.14);
}
.bridge::before { width: 430px; height: 430px; }
.bridge::after { width: 292px; height: 292px; border-color: rgba(36, 87, 230, 0.72); }
.bridge-line { position: absolute; width: min(100%, 470px); height: 1px; background: linear-gradient(90deg, transparent, rgba(255,255,255,.45), transparent); transform: rotate(-25deg); }
.bridge-core {
  position: relative;
  z-index: 3;
  width: 210px;
  height: 210px;
  border-radius: 50%;
  box-shadow: 0 0 0 16px rgba(36, 87, 230, 0.17);
  overflow: hidden;
}
.bridge-core img { width: 100%; height: 100%; display: block; }
.bridge-point {
  position: absolute;
  z-index: 4;
  width: 176px;
  min-height: 84px;
  display: flex;
  flex-direction: column;
  justify-content: center;
  padding: 14px 18px;
  border: 1px solid rgba(255, 255, 255, 0.18);
  border-radius: 14px;
  background: #20242b;
}
.bridge-point-left { top: 42px; left: 0; }
.bridge-point-right { right: 0; bottom: 54px; }
.bridge-point span { font-size: 11px; font-weight: 760; letter-spacing: 0.08em; }
.bridge-point small { margin-top: 7px; color: rgba(255, 255, 255, 0.5); font-size: 10px; line-height: 1.4; }
.bridge > p { position: absolute; bottom: 0; margin: 0; color: rgba(255, 255, 255, 0.37); font-family: var(--mono); font-size: 9px; letter-spacing: 0.13em; text-transform: uppercase; }

.section { width: min(1240px, 86vw); margin: 0 auto; padding: 132px 0; }
.split-section { display: grid; grid-template-columns: 0.9fr 1.1fr; gap: 10vw; }
.section h2, .network h2, .contact h2 {
  margin: 0;
  font-size: clamp(42px, 5vw, 76px);
  font-weight: 610;
  line-height: 1.03;
  letter-spacing: -0.054em;
}
html[lang="zh-CN"] .section h2, html[lang="zh-CN"] .network h2, html[lang="zh-CN"] .contact h2 { letter-spacing: -0.035em; line-height: 1.1; }
.body-large { padding-top: 34px; }
.body-large p { margin: 0 0 24px; color: #484f59; font-size: 20px; line-height: 1.72; }
.body-large p:last-child { padding: 20px 0 20px 26px; border-left: 3px solid var(--blue); color: var(--ink); font-size: 16px; font-weight: 650; }

.capabilities { padding-top: 28px; }
.section-title-row { display: grid; grid-template-columns: 0.55fr 1.45fr; align-items: end; padding-bottom: 52px; border-bottom: 1px solid var(--line); }
.capability-grid { display: grid; grid-template-columns: 1fr 1fr; }
.capability-card {
  min-height: 312px;
  display: flex;
  flex-direction: column;
  justify-content: space-between;
  padding: 32px;
  border-bottom: 1px solid var(--line);
}
.capability-card:nth-child(odd) { border-right: 1px solid var(--line); }
.number { color: var(--blue); font-family: var(--mono); font-size: 11px; }
.capability-card h3 { margin: 0 0 14px; font-size: 27px; letter-spacing: -0.035em; }
.capability-card p { max-width: 450px; margin: 0; color: var(--muted); font-size: 14px; line-height: 1.72; }

.network { color: var(--white); background: var(--blue); }
.network-inner { display: grid; grid-template-columns: 0.78fr 1.22fr; gap: 9vw; }
.network-intro { position: sticky; top: 126px; height: fit-content; }
.network-intro > p:last-child { max-width: 400px; margin: 28px 0 0; color: rgba(255, 255, 255, 0.7); font-size: 16px; line-height: 1.68; }
.network-item { display: grid; grid-template-columns: auto 1fr auto; gap: 19px; align-items: center; padding: 29px 0; border-bottom: 1px solid rgba(255, 255, 255, 0.22); }
.network-item:first-child { border-top: 1px solid rgba(255, 255, 255, 0.22); }
.network-mark { width: 50px; height: 50px; display: grid; place-items: center; border-radius: 50%; color: var(--ink); background: var(--white); font-size: 11px; font-weight: 800; }
.network-item h3 { margin: 0; font-size: 22px; font-weight: 630; letter-spacing: -0.025em; }
.network-item p { margin: 7px 0 0; color: rgba(255, 255, 255, 0.62); font-size: 12px; }
.arrow { color: var(--white); font-size: 18px; }
.affiliate-card { margin-top: 30px; padding: 24px; border: 1px solid rgba(255, 255, 255, 0.22); border-radius: 16px; background: rgba(15, 35, 95, 0.14); }
.affiliate-card > span { color: rgba(255, 255, 255, 0.55); font-size: 9px; font-weight: 720; letter-spacing: 0.15em; text-transform: uppercase; }
.affiliate-card h3 { margin: 14px 0 8px; font-size: 18px; }
.affiliate-card p { margin: 0; color: rgba(255, 255, 255, 0.68); font-size: 12px; line-height: 1.65; }
.legal-note { margin: 18px 0 0; color: rgba(255, 255, 255, 0.46); font-size: 9px; line-height: 1.55; }

.model { display: grid; grid-template-columns: 0.82fr 1.18fr; gap: 9vw; align-items: end; }
.model-copy > p:last-child { max-width: 430px; margin: 30px 0 0; color: var(--muted); font-size: 15px; line-height: 1.72; }
.model-steps { list-style: none; display: grid; grid-template-columns: repeat(4, 1fr); margin: 0; padding: 0; border-block: 1px solid var(--line); }
.model-steps li { min-height: 178px; display: flex; flex-direction: column; justify-content: space-between; padding: 21px 17px; border-right: 1px solid var(--line); }
.model-steps li:last-child { border-right: 0; }
.model-steps span { color: var(--blue); font-family: var(--mono); font-size: 9px; }
.model-steps strong { font-size: 19px; }

.contact { min-height: 570px; display: grid; place-items: center; padding: 100px 7vw; color: var(--white); background: var(--ink); text-align: center; }
.contact > div { max-width: 900px; }
.contact > div > p:not(.eyebrow) { max-width: 680px; margin: 28px auto 0; color: rgba(255, 255, 255, 0.62); font-size: 16px; line-height: 1.68; }
.contact-details {
  width: min(690px, 100%);
  display: grid;
  grid-template-columns: 1fr 1fr;
  gap: 12px;
  margin: 34px auto 0;
  font-style: normal;
}
.contact-details a {
  min-height: 88px;
  display: flex;
  flex-direction: column;
  align-items: flex-start;
  justify-content: center;
  gap: 9px;
  padding: 18px 22px;
  border: 1px solid rgba(255, 255, 255, 0.2);
  border-radius: 16px;
  background: rgba(255, 255, 255, 0.04);
  text-align: left;
  transition: transform 160ms ease, border-color 160ms ease, background 160ms ease;
}
.contact-details a:hover { transform: translateY(-2px); border-color: rgba(255, 255, 255, 0.44); background: rgba(255, 255, 255, 0.08); }
.contact-details span { color: rgba(255, 255, 255, 0.48); font-size: 9px; font-weight: 750; letter-spacing: 0.16em; text-transform: uppercase; }
.contact-details strong { max-width: 100%; color: var(--white); font-size: clamp(15px, 1.35vw, 18px); font-weight: 620; letter-spacing: -0.01em; overflow-wrap: anywhere; }

footer {
  min-height: 145px;
  display: grid;
  grid-template-columns: 1fr auto 1fr;
  align-items: center;
  gap: 24px;
  padding: 28px 5vw;
  color: rgba(255, 255, 255, 0.44);
  background: var(--ink);
  border-top: 1px solid rgba(255, 255, 255, 0.12);
  font-size: 10px;
}
.footer-brand { color: var(--white); }
footer > p:last-child { justify-self: end; }

@media (max-width: 1040px) {
  .hero { grid-template-columns: 1fr; padding-top: 155px; }
  .bridge { width: min(620px, 100%); margin: 0 auto; }
  .split-section, .network-inner, .model { grid-template-columns: 1fr; gap: 58px; }
  .network-intro { position: static; }
}

@media (max-width: 740px) {
  html { scroll-padding-top: 74px; }
  .site-header { height: 74px; grid-template-columns: 1fr auto; padding: 0 20px; }
  .desktop-nav { display: none; }
  .brand-mark { width: 40px; height: 40px; }
  .brand-name { font-size: 12px; }
  .hero { min-height: auto; padding: 122px 24px 58px; }
  .hero h1 { font-size: clamp(46px, 14vw, 68px); }
  html[lang="zh-CN"] .hero h1 { font-size: clamp(42px, 12.5vw, 60px); }
  .hero-actions { display: grid; }
  .button { width: 100%; }
  .hero-labels { margin-top: 42px; }
  .bridge { min-height: 390px; margin-top: 20px; }
  .bridge::before { width: 300px; height: 300px; }
  .bridge::after { width: 210px; height: 210px; }
  .bridge-core { width: 164px; height: 164px; }
  .bridge-point { width: 145px; min-height: 74px; padding: 11px 13px; }
  .bridge-point-left { top: 28px; }
  .bridge-point-right { bottom: 38px; }
  .section { width: auto; padding: 88px 24px; }
  .section h2, .network h2, .contact h2 { font-size: clamp(38px, 11.5vw, 54px); }
  .split-section { gap: 18px; }
  .body-large { padding-top: 18px; }
  .body-large p { font-size: 17px; }
  .section-title-row { display: block; padding-bottom: 36px; }
  .capability-grid { grid-template-columns: 1fr; }
  .capability-card { min-height: 245px; padding: 27px 0; }
  .capability-card:nth-child(odd) { border-right: 0; }
  .network-inner { gap: 42px; }
  .network-item { padding: 23px 0; }
  .network-mark { width: 43px; height: 43px; }
  .network-item h3 { font-size: 18px; }
  .model { gap: 40px; }
  .model-steps { grid-template-columns: 1fr 1fr; }
  .model-steps li:nth-child(2) { border-right: 0; }
  .model-steps li:nth-child(-n+2) { border-bottom: 1px solid var(--line); }
  .contact { min-height: 520px; padding: 88px 24px; }
  .contact-details { grid-template-columns: 1fr; }
  footer { grid-template-columns: 1fr; justify-items: start; padding: 46px 24px; }
  footer > p { margin: 0; }
  footer > p:last-child { justify-self: start; }
}

@media (max-width: 390px) {
  .site-header { padding-inline: 15px; }
  .brand { gap: 9px; }
  .language-switch { gap: 6px; }
  .hero { padding-inline: 19px; }
  .bridge-point { width: 132px; }
}

@media (prefers-reduced-motion: reduce) {
  html { scroll-behavior: auto; }
  *, *::before, *::after { transition-duration: 0.01ms !important; }
}