:root {
  color-scheme: light;
  --paper: #ffffff;
  --ink: #071b3e;
  --body: #253248;
  --muted: #526176;
  --line: #d0d9e5;
  --line-strong: #afbdcf;
  --blueprint: rgba(14, 55, 111, 0.18);
  --blueprint-strong: rgba(14, 55, 111, 0.52);
  --shell: 1440px;
  --gutter: clamp(30px, 4.2vw, 68px);
  --heading-font: "Songti SC", "STSong", "SimSun", serif;
  --body-font: "PingFang SC", "Microsoft YaHei", "Noto Sans CJK SC", Arial, sans-serif;
}

* { box-sizing: border-box; }

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

body {
  margin: 0;
  min-width: 320px;
  background: var(--paper);
  color: var(--body);
  font-family: var(--body-font);
  font-size: 16px;
  line-height: 1.75;
  -webkit-font-smoothing: antialiased;
  text-rendering: optimizeLegibility;
}

a { color: inherit; }

.shell {
  width: min(100%, var(--shell));
  margin: 0 auto;
  padding-inline: var(--gutter);
}

.skip-link {
  position: fixed;
  z-index: 20;
  top: 12px;
  left: 12px;
  transform: translateY(-150%);
  background: var(--ink);
  color: #fff;
  padding: 8px 12px;
}

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

.site-header {
  height: 86px;
  border-bottom: 1px solid var(--line-strong);
  background: rgba(255, 255, 255, 0.98);
}

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

.brand {
  display: inline-flex;
  align-items: center;
  gap: 22px;
  color: var(--ink);
  text-decoration: none;
  font-size: clamp(24px, 2.1vw, 38px);
  font-weight: 500;
  letter-spacing: 0.08em;
  line-height: 1;
}

.brand-mark {
  position: relative;
  display: block;
  width: 50px;
  height: 46px;
  flex: none;
}

.brand-mark i {
  position: absolute;
  width: 34px;
  height: 34px;
  border: 2px solid var(--ink);
}

.brand-mark i:first-child { top: 0; left: 0; }
.brand-mark i:last-child { right: 0; bottom: 0; }

.main-nav {
  display: flex;
  align-items: center;
  gap: clamp(46px, 5.5vw, 88px);
  color: #111b2c;
  font-size: 17px;
  letter-spacing: 0.08em;
}

.main-nav a {
  text-decoration: none;
  text-underline-offset: 7px;
}

.main-nav a:hover,
.main-nav a:focus-visible { text-decoration: underline; }

.hero {
  position: relative;
  min-height: 395px;
  overflow: hidden;
  border-bottom: 1px solid var(--line-strong);
}

.hero-inner {
  min-height: 395px;
  display: flex;
  align-items: center;
}

.hero-copy {
  position: relative;
  z-index: 2;
  width: 52%;
}

.hero h1,
.section-row > h2 {
  margin: 0;
  color: var(--ink);
  font-family: var(--heading-font);
  font-weight: 600;
  letter-spacing: 0.06em;
}

.hero h1 {
  font-size: clamp(46px, 4.25vw, 68px);
  line-height: 1.28;
}

.hero-copy > p {
  margin: 24px 0 0;
  color: #243249;
  font-size: clamp(17px, 1.4vw, 21px);
  line-height: 1.95;
  letter-spacing: 0.06em;
}

.hero-grid {
  position: absolute;
  inset: 0 0 0 50%;
  background-image:
    linear-gradient(var(--blueprint) 1px, transparent 1px),
    linear-gradient(90deg, var(--blueprint) 1px, transparent 1px);
  background-size: 62px 62px;
}

.hero-grid::before,
.hero-grid::after {
  content: "";
  position: absolute;
  border-left: 1px solid var(--blueprint);
  height: 620px;
  top: -110px;
  transform: rotate(45deg);
}

.hero-grid::before { left: 31%; }
.hero-grid::after { right: 12%; }

.blueprint-circle,
.blueprint-line,
.blueprint-node { position: absolute; display: block; }

.blueprint-circle {
  border: 1px solid var(--blueprint-strong);
  border-radius: 50%;
}

.circle-one { width: 180px; height: 180px; left: 27%; top: 98px; }
.circle-two { width: 155px; height: 155px; right: -45px; bottom: -18px; border-style: dashed; }
.blueprint-line { background: var(--blueprint-strong); }
.line-one { left: 24%; top: 200px; width: 48%; height: 1px; transform: rotate(45deg); }
.line-two { left: 18%; bottom: 54px; width: 64%; height: 1px; }
.blueprint-node { width: 5px; height: 5px; border-radius: 50%; background: #0d3b78; }
.node-one { left: 16%; top: 30px; }
.node-two { left: 61%; top: 84px; }
.node-three { left: 65%; bottom: 51px; }

.content-shell { padding-inline: max(30px, var(--gutter)); }

.section-row {
  display: grid;
  grid-template-columns: minmax(230px, 285px) minmax(0, 1fr);
  gap: 22px;
  border-bottom: 1px solid var(--line-strong);
}

.section-row > h2 {
  font-size: 35px;
  line-height: 1.25;
}

.about-section { padding: 32px 0 28px; }

.about-section > p {
  width: min(100%, 640px);
  margin: 0;
  color: #2d3a4e;
  font-size: 17px;
  line-height: 2;
  letter-spacing: 0.045em;
}

.business-section { padding: 28px 0 26px; }

.business-list {
  width: min(100%, 800px);
  margin: 0;
  padding: 0;
  list-style: none;
}

.business-list li {
  display: grid;
  grid-template-columns: 74px 1fr;
  align-items: baseline;
  gap: 16px;
  padding: 11px 0;
  border-bottom: 1px solid var(--line-strong);
}

.business-list li:first-child { padding-top: 0; }
.business-list li:last-child { padding-bottom: 0; border-bottom: 0; }

.business-list .index {
  color: var(--ink);
  font-family: Georgia, "Times New Roman", serif;
  font-size: 32px;
  line-height: 1;
}

.business-list li > div {
  display: flex;
  align-items: baseline;
  gap: 12px;
  min-width: 0;
}

.business-list h3,
.business-list p,
.values-list h3,
.values-list p { margin: 0; }

.business-list h3 {
  flex: none;
  color: #14223a;
  font-size: 17px;
  font-weight: 600;
  letter-spacing: 0.03em;
}

.business-list h3::after { content: " —"; font-weight: 400; }

.business-list p {
  color: #344156;
  font-size: 15px;
  letter-spacing: 0.03em;
}

.values-section { padding: 26px 0 28px; }

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

.values-list article {
  display: flex;
  align-items: baseline;
  gap: 11px;
  min-width: 0;
  padding: 0 34px;
  border-left: 1px solid var(--line-strong);
}

.values-list article:first-child { padding-left: 0; border-left: 0; }
.values-list article:last-child { padding-right: 0; }

.values-list h3 {
  flex: none;
  color: var(--ink);
  font-family: var(--heading-font);
  font-size: 25px;
  letter-spacing: 0.08em;
}

.values-list h3::after { content: " —"; color: var(--muted); }

.values-list p { color: #435066; font-size: 15px; }

.site-footer { background: var(--paper); }

.footer-inner {
  min-height: 72px;
  display: flex;
  align-items: center;
  justify-content: space-between;
  color: #536176;
  font-size: 14px;
}

.footer-inner p { margin: 0; }

@media (max-width: 900px) {
  :root { --gutter: 28px; }

  .site-header { height: 78px; }
  .main-nav { gap: 26px; font-size: 15px; }
  .brand { gap: 14px; font-size: 25px; }
  .brand-mark { transform: scale(0.82); transform-origin: left center; width: 42px; }

  .hero { min-height: 440px; }
  .hero-inner { min-height: 440px; align-items: flex-start; padding-top: 78px; }
  .hero-copy { width: 78%; }
  .hero-grid { inset: 42% 0 0 28%; opacity: 0.72; }

  .section-row { grid-template-columns: 210px minmax(0, 1fr); }
  .section-row > h2 { font-size: 31px; }
  .values-list { grid-template-columns: 1fr; }
  .values-list article { padding: 10px 0; border-left: 0; border-bottom: 1px solid var(--line); }
  .values-list article:first-child { padding-top: 0; }
  .values-list article:last-child { padding-bottom: 0; border-bottom: 0; }
}

@media (max-width: 680px) {
  :root { --gutter: 22px; }

  .site-header { height: 82px; border-bottom-color: transparent; }
  .header-inner { justify-content: flex-start; }
  .main-nav { display: none; }
  .brand { font-size: 25px; letter-spacing: 0.07em; }

  .hero { min-height: 485px; }
  .hero-inner { min-height: 485px; padding-top: 62px; align-items: flex-start; }
  .hero-copy { width: 100%; }
  .hero h1 { font-size: clamp(39px, 11vw, 52px); line-height: 1.38; letter-spacing: 0.04em; }
  .hero-copy > p { margin-top: 26px; font-size: 17px; line-height: 1.95; }
  .desktop-only { display: none; }
  .hero-grid { inset: 38% -25% 0 33%; background-size: 54px 54px; opacity: 0.55; }
  .circle-one { width: 130px; height: 130px; }

  .section-row { display: block; }
  .section-row > h2 { font-size: 32px; }
  .about-section { padding: 44px 0 40px; }
  .about-section > p { margin-top: 24px; font-size: 16px; line-height: 2; }
  .business-section { padding: 42px 0 30px; }
  .business-list { margin-top: 24px; }
  .business-list li { grid-template-columns: 76px 1fr; gap: 10px; padding: 22px 0; align-items: start; }
  .business-list .index { font-size: 48px; line-height: 1.05; }
  .business-list li > div { display: block; }
  .business-list h3 { font-size: 18px; }
  .business-list h3::after { content: ""; }
  .business-list p { margin-top: 8px; font-size: 15px; line-height: 1.8; }

  .values-section { padding: 42px 0 34px; }
  .values-list { margin-top: 24px; }
  .values-list article { display: block; padding: 18px 0; }
  .values-list h3 { font-size: 24px; }
  .values-list h3::after { content: ""; }
  .values-list p { margin-top: 4px; font-size: 15px; }

  .footer-inner { min-height: 96px; display: block; padding-top: 22px; padding-bottom: 20px; }
  .footer-inner p + p { margin-top: 3px; }
}

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