:root {
  color-scheme: light;
  --navy: #0b1f3a;
  --teal: #009aa6;
  --ink: #425367;
  --line: #dce3e9;
  --wash: #f4f7f9;
  --white: #ffffff;
  font-family: -apple-system, BlinkMacSystemFont, "PingFang SC", "Helvetica Neue", "Microsoft YaHei", Arial, sans-serif;
  color: var(--navy);
  background: var(--white);
  font-synthesis: none;
  -webkit-text-size-adjust: 100%;
}

* { box-sizing: border-box; }
body { margin: 0; font-size: 16px; line-height: 1.8; }
a { color: inherit; text-underline-offset: 5px; }
a:hover { text-decoration: underline; }
a:focus-visible { outline: 3px solid var(--teal); outline-offset: 5px; }
h1, h2, h3, p { margin: 0; }
h1, h2, h3 { font-weight: 600; }
h2 { font-size: 26px; line-height: 1.4; letter-spacing: -0.025em; }
h3 { font-size: 19px; line-height: 1.5; }
p { color: var(--ink); }
section[id] { scroll-margin-top: 24px; }
.container { width: min(1080px, calc(100% - 64px)); margin-inline: auto; }
.skip-link { position: absolute; top: 12px; left: 16px; padding: 10px 16px; background: var(--white); z-index: 2; transform: translateY(-180%); }
.skip-link:focus { transform: translateY(0); }

.site-header { border-top: 4px solid var(--navy); border-bottom: 1px solid var(--line); }
.header-inner { display: flex; align-items: center; gap: 30px; min-height: 100px; }
.brand { display: inline-flex; align-items: center; gap: 12px; text-decoration: none; white-space: nowrap; font-size: 25px; font-weight: 650; letter-spacing: -0.6px; }
.brand img { display: block; flex-shrink: 0; }
.brand-cn { font-size: 19px; font-weight: 500; letter-spacing: 0; }
.main-nav { display: flex; align-items: center; gap: 24px; margin-left: auto; font-size: 14px; }
.main-nav a { text-decoration: none; }
.main-nav a:hover { text-decoration: underline; }
.language-nav { display: flex; align-items: center; gap: 4px; padding-left: 24px; border-left: 1px solid var(--line); font-size: 13px; white-space: nowrap; }
.language-nav a { padding: 8px 10px; text-decoration: none; }
.language-nav a[aria-current="page"] { color: var(--white); background: var(--navy); }
.language-nav a:hover { text-decoration: underline; }

.intro { display: grid; grid-template-columns: 1.2fr 1fr; align-items: center; gap: 80px; padding-block: 84px 88px; }
.section-label { margin-bottom: 22px; color: var(--ink); font-size: 15px; }
h1 { font-size: clamp(36px, 4.5vw, 52px); line-height: 1.3; letter-spacing: -0.045em; }
.intro-description { margin-top: 25px; max-width: 32em; font-size: 17px; }
.text-link { display: inline-flex; align-items: baseline; gap: 14px; margin-top: 28px; font-size: 15px; font-weight: 600; text-decoration: underline; text-decoration-color: var(--teal); text-decoration-thickness: 2px; }
.text-link:hover { text-decoration-color: var(--navy); }
.text-link span { color: var(--ink); }
.product-scope { background: var(--wash); border-top: 3px solid var(--teal); padding: 26px 30px 10px; }
.product-scope h2 { font-size: 15px; font-weight: 500; color: var(--ink); letter-spacing: 0; margin-bottom: 8px; }
.product-item { padding-block: 21px; }
.product-item + .product-item { border-top: 1px solid var(--line); }
.product-item h3 { font-size: 18px; }
.product-item p { margin-top: 6px; font-size: 14px; line-height: 1.7; }

.services { padding-block: 58px 64px; border-block: 1px solid var(--line); background: var(--wash); }
.service-grid { display: grid; grid-template-columns: repeat(3, minmax(0, 1fr)); gap: 36px; margin-top: 36px; }
.service-block { padding-top: 19px; border-top: 2px solid var(--navy); }
.service-block p { margin-top: 15px; font-size: 15px; }
.detail-section { display: grid; grid-template-columns: 1fr 2.15fr; gap: 60px; align-items: baseline; padding-block: 48px; }
.detail-section h2 { font-size: 23px; }
.detail-section p { max-width: 46em; }
.cooperation { border-top: 1px solid var(--line); padding-block: 48px 60px; }
.contact { background: var(--navy); color: var(--white); }
.contact-inner { display: grid; grid-template-columns: 1fr 2.15fr; gap: 60px; align-items: baseline; padding-block: 40px 43px; }
.contact h2 { font-size: 23px; }
.contact-details p { color: #c8d4df; font-size: 14px; margin-bottom: 7px; }
.contact-details a { font-size: 23px; line-height: 1.5; text-decoration-color: var(--teal); overflow-wrap: anywhere; }
.site-footer { padding-block: 25px; }
.site-footer p { font-size: 12px; line-height: 1.8; }

html[lang="en"] h1 { font-size: clamp(34px, 4vw, 46px); line-height: 1.23; }
html[lang="en"] .service-block h3 { max-width: 16em; }

@media (max-width: 1000px) {
  .header-inner { flex-wrap: wrap; gap: 12px 24px; padding-block: 20px 16px; }
  .language-nav { margin-left: auto; }
  .main-nav { order: 3; width: 100%; margin-left: 0; gap: 28px; }
  .intro { gap: 40px; padding-block: 64px; }
  .service-grid { gap: 24px; }
  .detail-section, .contact-inner { gap: 36px; }
}

@media (max-width: 700px) {
  .container { width: calc(100% - 40px); }
  .header-inner { gap: 16px 10px; }
  .brand { gap: 8px; font-size: 22px; }
  .brand img { width: 29px; height: 29px; }
  .brand-cn { font-size: 16px; }
  .language-nav { padding-left: 10px; font-size: 12px; }
  .language-nav a { padding: 8px 6px; }
  .main-nav { gap: 24px; flex-wrap: wrap; font-size: 13px; }
  .intro { grid-template-columns: 1fr; gap: 36px; padding-block: 46px 48px; }
  .section-label { margin-bottom: 16px; }
  h1 { font-size: 42px; }
  .intro-description { margin-top: 20px; font-size: 16px; }
  .text-link { margin-top: 22px; }
  .product-scope { padding-inline: 24px; }
  .services { padding-block: 40px 44px; }
  h2 { font-size: 23px; }
  .service-grid { grid-template-columns: 1fr; gap: 28px; margin-top: 28px; }
  .service-block { padding-top: 16px; }
  .service-block p { margin-top: 10px; }
  html[lang="en"] .service-block h3 { max-width: none; }
  .detail-section, .contact-inner { grid-template-columns: 1fr; gap: 18px; padding-block: 36px; }
  .contact-details a { font-size: clamp(17px, 4.7vw, 23px); }
  .site-footer { padding-block: 22px; }
}

@media (max-width: 380px) {
  .container { width: calc(100% - 32px); }
  .brand { font-size: 20px; }
  .brand img { width: 25px; height: 25px; }
  .brand-cn { font-size: 14px; }
  .language-nav { gap: 0; border-left: 0; padding-left: 0; }
  .main-nav { gap: 18px; }
  h1 { font-size: 38px; }
}

@media print {
  .container { width: 100%; }
  .main-nav, .language-nav, .skip-link, .text-link { display: none; }
  .intro, .services, .detail-section, .contact-inner { padding-block: 20px; }
  .intro { gap: 30px; }
  .contact { background: var(--white); color: var(--navy); border-top: 1px solid var(--line); }
  .contact-details p { color: var(--ink); }
  .service-block, .detail-section, .contact { break-inside: avoid; }
}