:root {
  --ink: #172026;
  --muted: #66747f;
  --line: #dfe7ea;
  --paper: #f6f8f5;
  --white: #ffffff;
  --blue: #0876d6;
  --blue-dark: #075a9f;
  --green: #3f7b55;
  --mint: #dbeee4;
  --amber: #d6a84b;
  --shadow: 0 20px 50px rgba(23, 32, 38, .13);
  font-family: Inter, ui-sans-serif, system-ui, -apple-system, BlinkMacSystemFont, "Segoe UI", "Microsoft YaHei", "Noto Sans CJK SC", sans-serif;
}
* { box-sizing: border-box; }
html { scroll-behavior: smooth; }
body { margin: 0; color: var(--ink); background: var(--paper); line-height: 1.6; }
img { display: block; max-width: 100%; height: auto; }
a { color: inherit; text-decoration: none; }
.site-header {
  position: sticky; top: 0; z-index: 20; display: grid; grid-template-columns: auto minmax(0, 1fr) auto auto; gap: 18px;
  align-items: center; min-height: 76px; padding: 12px clamp(18px, 4vw, 56px);
  background: rgba(255,255,255,.92); border-bottom: 1px solid rgba(223,231,234,.9); backdrop-filter: blur(18px);
}
.brand, .footer-brand { display: inline-flex; align-items: center; gap: 10px; font-weight: 760; letter-spacing: 0; }
.brand img { width: 48px; height: 34px; object-fit: contain; }
.site-nav { display: flex; justify-content: center; gap: clamp(14px, 2.4vw, 34px); color: #30404a; font-size: 15px; }
.site-nav a:hover, .footer-links a:hover, .language-switch a:hover { color: var(--blue); }
.language-switch {
  display: inline-flex; align-items: center; justify-content: center; gap: 7px; min-height: 38px; padding: 0 11px;
  border: 1px solid var(--line); border-radius: 999px; background: rgba(255,255,255,.74); color: #41515a;
  font-size: 13px; font-weight: 800; white-space: nowrap;
}
.language-switch .active { color: var(--blue-dark); }
.language-switch span { color: #9aa8af; }
.nav-cta, .button {
  display: inline-flex; align-items: center; justify-content: center; min-height: 44px; padding: 0 18px;
  border-radius: 6px; font-weight: 700; border: 1px solid transparent;
}
.nav-cta, .button.primary { background: var(--blue); color: white; }
.button.secondary { color: white; border-color: rgba(255,255,255,.55); background: rgba(255,255,255,.12); }
.hero { position: relative; min-height: min(760px, calc(100vh - 72px)); overflow: hidden; display: grid; align-items: center; }
.hero > img { position: absolute; inset: 0; width: 100%; height: 100%; object-fit: cover; }
.hero-overlay { position: absolute; inset: 0; background: linear-gradient(90deg, rgba(10,18,22,.84), rgba(10,18,22,.58) 42%, rgba(10,18,22,.18)); }
.hero-content { position: relative; max-width: 760px; padding: clamp(72px, 11vw, 140px) clamp(22px, 7vw, 92px); color: white; }
.eyebrow { margin: 0 0 12px; color: var(--blue); font-size: 13px; font-weight: 800; text-transform: uppercase; letter-spacing: .08em; }
.hero .eyebrow, .feature-band .eyebrow { color: #8fc9ff; }
h1, h2, h3 { line-height: 1.08; margin: 0; letter-spacing: 0; }
h1 { font-size: 5.75rem; max-width: 980px; }
h2 { font-size: 3.35rem; }
h3 { font-size: 24px; }
p { margin: 0; }
.hero-content > p:not(.eyebrow) { max-width: 660px; margin-top: 22px; font-size: 1.32rem; color: rgba(255,255,255,.88); }
.hero-actions { display: flex; flex-wrap: wrap; gap: 12px; margin-top: 34px; }
.band, .section, .split-section, .feature-band, .cta-strip, .page-hero, .product-section, .contact-layout, .article-page {
  padding-left: clamp(20px, 5vw, 72px); padding-right: clamp(20px, 5vw, 72px);
}
.metrics { display: grid; grid-template-columns: repeat(4, 1fr); gap: 1px; background: var(--line); border-bottom: 1px solid var(--line); }
.metrics div { background: white; padding: 26px clamp(18px, 3vw, 36px); }
.metrics strong { display: block; color: var(--blue); font-size: 3rem; line-height: 1; }
.metrics span { display: block; margin-top: 8px; color: var(--muted); font-size: 14px; }
.split-section { display: grid; grid-template-columns: minmax(0, 1.15fr) minmax(320px, .85fr); gap: clamp(28px, 6vw, 78px); align-items: center; padding-top: 92px; padding-bottom: 92px; }
.section { padding-top: 92px; padding-bottom: 92px; }
.section-heading { max-width: 820px; margin-bottom: 36px; }
.section-heading span { color: var(--blue); font-weight: 800; text-transform: uppercase; font-size: 13px; letter-spacing: .08em; }
.section-heading h2 { margin-top: 10px; }
.section-heading p { margin-top: 16px; color: var(--muted); font-size: 18px; }
.card-grid { display: grid; grid-template-columns: repeat(3, minmax(0, 1fr)); gap: 18px; }
.card, .contact-card { background: white; border: 1px solid var(--line); border-radius: 8px; padding: 28px; min-height: 245px; box-shadow: 0 8px 26px rgba(23,32,38,.04); }
.card p, .contact-card p { margin-top: 12px; color: var(--muted); }
.card a { display: inline-flex; margin-top: 22px; color: var(--blue-dark); font-weight: 800; }
.media-panel { margin: 0; }
.media-panel img, .product-section img, .article-card img, .article-hero-image { border-radius: 8px; object-fit: cover; box-shadow: var(--shadow); filter: saturate(.98) contrast(1.03); }
.media-panel img { aspect-ratio: 1 / 1; width: 100%; }
.diagram-section .media-panel img { aspect-ratio: 16 / 10; object-fit: contain; background: #101a20; }
.media-panel figcaption { margin-top: 10px; color: var(--muted); font-size: 13px; }
.feature-band { display: grid; grid-template-columns: minmax(0, .9fr) minmax(320px, 1fr); gap: 38px; align-items: start; padding-top: 80px; padding-bottom: 80px; background: #18262e; color: white; }
.feature-band p { margin-top: 18px; color: rgba(255,255,255,.75); font-size: 18px; }
.check-list { margin: 0; padding: 0; list-style: none; display: grid; gap: 14px; }
.check-list li { position: relative; padding-left: 28px; color: inherit; }
.check-list li::before { content: ""; position: absolute; left: 0; top: .55em; width: 10px; height: 10px; border-radius: 50%; background: var(--amber); }
.feature-band .check-list li { color: rgba(255,255,255,.88); }
.cta-strip { display: grid; grid-template-columns: minmax(0, 1fr) minmax(260px, .72fr) auto; gap: 24px; align-items: center; padding-top: 54px; padding-bottom: 54px; background: var(--mint); border-top: 1px solid #cfe3d7; border-bottom: 1px solid #cfe3d7; }
.cta-strip p { color: #475760; }
.page-hero { padding-top: 92px; padding-bottom: 72px; background: white; border-bottom: 1px solid var(--line); }
.page-hero.compact h1 { max-width: 960px; font-size: 4.75rem; }
.page-hero.compact p:not(.eyebrow) { max-width: 760px; margin-top: 18px; color: var(--muted); font-size: 19px; }
.page-hero.visual { display: grid; grid-template-columns: minmax(0, .92fr) minmax(340px, .72fr); gap: clamp(28px, 5vw, 64px); align-items: center; }
.page-hero.visual img { width: 100%; aspect-ratio: 4 / 3; object-fit: cover; border-radius: 8px; box-shadow: var(--shadow); }
.content-stack { display: grid; gap: 18px; }
.content-stack p { color: var(--muted); font-size: 18px; }
.pill-list { display: flex; flex-wrap: wrap; gap: 10px; margin-top: 12px; }
.pill-list span { border: 1px solid var(--line); background: white; border-radius: 999px; padding: 8px 13px; color: #40515b; font-weight: 700; font-size: 13px; }
.product-section { display: grid; grid-template-columns: minmax(0, .9fr) minmax(360px, 1fr); gap: clamp(28px, 6vw, 72px); align-items: center; padding-top: 86px; padding-bottom: 86px; }
.product-section.reverse { background: white; }
.product-section img { width: 100%; aspect-ratio: 16 / 10; }
.product-section p { margin-top: 18px; color: var(--muted); font-size: 18px; }
.product-section .check-list { margin-top: 24px; margin-bottom: 28px; }
.article-grid { display: grid; grid-template-columns: repeat(3, minmax(0, 1fr)); gap: 22px; }
.article-card { background: white; border: 1px solid var(--line); border-radius: 8px; overflow: hidden; }
.article-card img { width: 100%; aspect-ratio: 16 / 10; border-radius: 0; box-shadow: none; }
.article-card div { padding: 22px; }
.article-card span { color: var(--blue); font-weight: 800; font-size: 12px; }
.article-card h3 { margin-top: 8px; font-size: 23px; }
.article-card p { margin-top: 12px; color: var(--muted); }
.article-page { max-width: 1040px; margin: 0 auto; padding-top: 78px; padding-bottom: 90px; }
.article-page header { max-width: 860px; }
.article-page header h1 { font-size: 4.75rem; }
.article-page header > p:not(.eyebrow) { margin-top: 18px; color: var(--muted); font-size: 20px; }
.back-link { display: inline-flex; margin-bottom: 26px; color: var(--blue-dark); font-weight: 800; }
.article-hero-image { width: 100%; aspect-ratio: 16 / 8; margin-top: 42px; }
.article-body { max-width: 780px; margin: 44px auto 0; display: grid; gap: 20px; font-size: 19px; color: #2f414b; }
.contact-layout { display: grid; grid-template-columns: repeat(2, minmax(0, 1fr)); gap: 22px; padding-top: 80px; padding-bottom: 90px; }
.contact-card.accent { background: #17262e; color: white; border-color: #17262e; }
.contact-card.accent p { color: rgba(255,255,255,.78); }
.site-footer { display: grid; grid-template-columns: minmax(0, 1fr) auto; gap: 36px; padding: 46px clamp(20px, 5vw, 72px); background: #101a20; color: white; }
.site-footer p { max-width: 620px; margin-top: 12px; color: rgba(255,255,255,.68); }
.footer-brand img { width: 42px; height: 30px; object-fit: contain; filter: brightness(0) invert(1); }
.footer-links { display: flex; flex-wrap: wrap; gap: 18px; align-items: start; color: rgba(255,255,255,.78); }
@media (max-width: 920px) {
  .site-header { grid-template-columns: 1fr auto; }
  .site-nav { grid-column: 1 / -1; grid-row: 2; justify-content: flex-start; overflow-x: auto; padding-bottom: 4px; }
  .language-switch { grid-column: 2; grid-row: 1; }
  .nav-cta { display: none; }
  .metrics, .card-grid, .article-grid, .contact-layout { grid-template-columns: 1fr 1fr; }
  .split-section, .feature-band, .product-section, .cta-strip, .site-footer, .page-hero.visual { grid-template-columns: 1fr; }
  .media-panel img { aspect-ratio: 16 / 10; }
  h1 { font-size: 4.25rem; }
  h2 { font-size: 2.75rem; }
  .page-hero.compact h1, .article-page header h1 { font-size: 3.8rem; }
}
@media (max-width: 620px) {
  .site-header { padding: 10px 18px; }
  .brand span { font-size: 15px; }
  .site-nav { gap: 18px; font-size: 14px; }
  .language-switch { font-size: 12px; padding: 0 9px; }
  .hero { min-height: 680px; }
  h1 { font-size: 2.75rem; }
  h2 { font-size: 2.15rem; }
  h3 { font-size: 1.35rem; }
  .page-hero.compact h1, .article-page header h1 { font-size: 2.65rem; }
  .hero-content > p:not(.eyebrow) { font-size: 1.1rem; }
  .metrics strong { font-size: 2.45rem; }
  .metrics, .card-grid, .article-grid, .contact-layout { grid-template-columns: 1fr; }
  .metrics div { padding: 22px; }
  .split-section, .section, .feature-band, .product-section { padding-top: 62px; padding-bottom: 62px; }
  .article-hero-image { aspect-ratio: 4 / 3; }
}