:root{--navy:#071b2d;--navy-2:#0a2238;--blue:#0d78b9;--ice:#7bcdf3;--ice-2:#b6e4fa;--white:#f2f7fb;--silver:#b7cad9;--muted:#8ea9bd;--line:#31516a;--focus:#7fd8ff;--paper:#eef4f8;--ink:#12304a}
*{box-sizing:border-box}
html{scroll-behavior:smooth;background:var(--navy)}
body{margin:0;background:var(--navy);color:var(--white);font-family:"Segoe UI",Arial,"Microsoft YaHei UI","Microsoft YaHei",sans-serif;-webkit-font-smoothing:antialiased}
button,a{font:inherit;color:inherit}
a{text-decoration:none}
button{cursor:pointer}
img{display:block;max-width:100%}
h1,h2,h3,p{margin:0}
main,section,header,footer,nav,div{min-width:0}
::selection{background:#2d8cc1;color:#fff}
:focus-visible{outline:3px solid var(--focus);outline-offset:4px}
.skip-link{position:fixed;top:-100px;left:20px;z-index:1000;background:#fff;color:#102c43;padding:12px 16px}
.skip-link:focus{top:12px}
.site-header{position:relative;z-index:20;display:grid;grid-template-columns:auto 1fr auto;align-items:center;gap:36px;margin:0 clamp(24px,4.4vw,84px);min-height:104px;border-bottom:1px solid var(--line)}
.brand{display:inline-flex;align-items:center}
.brand img{width:176px;height:auto}
.primary-nav{justify-self:center;display:flex;align-items:center;gap:34px}
.primary-nav a{font-size:14px;color:#c6d8e5;line-height:1;min-height:44px;display:inline-flex;align-items:center;border-bottom:1px solid transparent}
.primary-nav a:hover{color:#fff;border-color:#6dbfe9}
.header-actions{display:flex;align-items:center;gap:14px;justify-self:end}
.language-toggle{min-width:44px;min-height:44px;border:0;background:transparent;padding:0 8px;color:#d9e8f3;font-size:14px}
.library-trigger{min-height:44px;border:1px solid #7995aa;background:transparent;padding:10px 15px;display:inline-flex;align-items:center;gap:12px;font-size:14px;font-weight:600;white-space:nowrap;transition:border-color .15s,background-color .15s}
.library-trigger:hover{border-color:var(--ice);background:#0b2a43}
.hero{position:relative;isolation:isolate;overflow:hidden;touch-action:pan-y;padding:clamp(68px,8vh,98px) clamp(24px,4.4vw,84px) 58px;min-height:calc(100svh - 104px)}
.signal-field,.signal-fallback{position:absolute;z-index:-1;inset:18px 0 122px;width:100%;height:calc(100% - 140px);pointer-events:none}
.signal-field{opacity:.72}
.signal-fallback{opacity:.18;background-image:radial-gradient(circle at 20% 48%,#6cbce9 0 1px,transparent 1.5px),radial-gradient(circle at 75% 38%,#d8effb 0 1px,transparent 1.5px);background-size:19px 23px,31px 29px}
.hero-copy{position:relative;z-index:1;text-align:center;max-width:1040px;margin:0 auto}
.eyebrow,.section-kicker,.proof-label,.scope-state{font-family:Consolas,"SFMono-Regular","Microsoft YaHei UI",monospace;letter-spacing:.12em;text-transform:uppercase;font-size:12px;line-height:1.6;color:var(--ice)}
.hero h1{display:flex;flex-direction:column;align-items:center;margin-top:22px;font-size:clamp(76px,6.5vw,118px);font-weight:400;line-height:.94;letter-spacing:-.05em;text-shadow:0 7px 30px #071b2d}
.hero h1 em{font-style:normal;color:var(--ice);font-weight:400}
.hero-lead{max-width:840px;margin:28px auto 0;font-size:20px;line-height:1.68;color:#e1edf5;text-shadow:0 2px 18px #071b2d}
.hero-scope{max-width:780px;margin:15px auto 0;font-size:16px;line-height:1.7;color:#afc5d5;text-shadow:0 2px 18px #071b2d}
.hero-proof{position:relative;z-index:1;display:grid;grid-template-columns:1fr 1fr;gap:64px;max-width:1120px;margin:58px auto 0;padding:23px 0 0;border-top:1px solid #41617a;text-align:left}
.hero-proof>div{display:grid;grid-template-columns:150px 1fr;gap:22px;align-items:start}
.hero-proof p{font-size:15px;line-height:1.65;color:#c0d2df}
.section{display:grid;grid-template-columns:minmax(260px,.82fr) minmax(0,1.3fr);gap:clamp(58px,8vw,130px);padding:110px clamp(24px,4.4vw,84px);border-top:1px solid var(--line)}
.section-heading{max-width:560px}
.section-heading h2{margin-top:15px;font-size:clamp(38px,3.3vw,58px);line-height:1.08;letter-spacing:-.038em;font-weight:400}
.section-body{max-width:930px}
.section-intro{font-size:19px;line-height:1.78;color:#d5e3ed;max-width:800px}
.principles{display:grid;grid-template-columns:repeat(3,1fr);gap:0;margin-top:46px;border-top:1px solid #41617a;border-bottom:1px solid #41617a}
.principles article{padding:24px 28px 28px 0}
.principles article+article{padding-left:28px;border-left:1px solid #41617a}
.principles article>span{font:12px/1.5 Consolas,monospace;color:var(--ice)}
.principles h3{margin-top:14px;font-size:18px;font-weight:500;line-height:1.35}
.principles p{margin-top:10px;font-size:15px;line-height:1.7;color:#afc5d5}
.section-technology{background:#081f34}
.engineering-qualities{display:grid;grid-template-columns:repeat(4,1fr);margin-top:42px;border-top:1px solid #41617a;border-bottom:1px solid #41617a}
.engineering-qualities span{padding:20px 16px 20px 0;font-size:14px;color:#d9e8f2}
.engineering-qualities span+span{padding-left:16px;border-left:1px solid #41617a}
.scope-grid{display:grid;grid-template-columns:1fr 1fr;border-top:1px solid #41617a;border-bottom:1px solid #41617a}
.scope-grid article{padding:28px 42px 32px 0}
.scope-grid article+article{padding-left:42px;border-left:1px solid #41617a}
.scope-grid h3{margin-top:15px;font-size:25px;font-weight:450;line-height:1.3}
.scope-grid p{margin-top:12px;font-size:16px;line-height:1.72;color:#afc5d5}
.site-footer{display:grid;grid-template-columns:auto 1fr auto;align-items:center;gap:28px;padding:32px clamp(24px,4.4vw,84px);border-top:1px solid var(--line);color:#8ea9bd;font-size:13px;line-height:1.5}
.site-footer span:first-child{letter-spacing:.16em;color:#c9d9e5}
.site-footer span:nth-child(2){text-align:center}
html[lang="zh-CN"] .eyebrow,html[lang="zh-CN"] .section-kicker,html[lang="zh-CN"] .proof-label,html[lang="zh-CN"] .scope-state{font-family:"Segoe UI","Microsoft YaHei UI","Microsoft YaHei",sans-serif;font-size:13px;letter-spacing:.04em}
html[lang="zh-CN"] .hero h1{font-size:clamp(66px,5.6vw,100px);letter-spacing:-.035em;line-height:1.04}
html[lang="zh-CN"] .hero-lead{font-size:19px}
html[lang="zh-CN"] .hero-scope,html[lang="zh-CN"] .hero-proof p,html[lang="zh-CN"] .principles p,html[lang="zh-CN"] .scope-grid p,html[lang="zh-CN"] .engineering-qualities span{font-size:15px}
html[lang="zh-CN"] .primary-nav a,html[lang="zh-CN"] .language-toggle,html[lang="zh-CN"] .library-trigger,html[lang="zh-CN"] .site-footer{font-size:14px}
@media(max-width:1100px){
  .site-header{grid-template-columns:auto 1fr auto;gap:20px}
  .primary-nav{gap:20px}
  .primary-nav a{font-size:13px}
  .hero h1{font-size:84px}
  .hero-proof{gap:38px}
  .hero-proof>div{grid-template-columns:125px 1fr}
  .section{gap:58px}
  .principles{grid-template-columns:1fr}
  .principles article,.principles article+article{padding:20px 0;border-left:0}
  .principles article+article{border-top:1px solid #41617a}
}
@media(max-width:900px){
  .primary-nav{display:none}
  .site-header{grid-template-columns:auto 1fr;min-height:94px}
  .header-actions{grid-column:2}
  .hero{padding-top:64px}
  .hero h1{font-size:clamp(62px,10vw,82px)}
  .hero-proof{grid-template-columns:1fr;gap:0}
  .hero-proof>div{grid-template-columns:150px 1fr;padding:18px 0}
  .hero-proof>div+div{border-top:1px solid #31516a}
  .section{grid-template-columns:1fr;padding-top:84px;padding-bottom:84px;gap:38px}
  .section-heading{max-width:720px}
  .section-body{max-width:none}
  .engineering-qualities{grid-template-columns:1fr 1fr}
  .engineering-qualities span:nth-child(3){border-left:0;border-top:1px solid #41617a;padding-left:0}
  .engineering-qualities span:nth-child(4){border-top:1px solid #41617a}
}
@media(max-width:600px){
  .site-header{grid-template-columns:1fr auto;margin:0 22px;padding:16px 0;min-height:0;gap:10px 14px}
  .brand img{width:132px}
  .header-actions{grid-column:1/-1;display:flex;width:100%;justify-content:flex-end;border-top:1px solid #25465f;padding-top:10px}
  .language-toggle{font-size:13px}
  .library-trigger{font-size:13px;padding:9px 12px}
  .hero{min-height:0;padding:58px 22px 46px}
  .signal-field,.signal-fallback{inset:46px -28% 230px;width:156%;height:auto}
  .eyebrow{font-size:11px;line-height:1.7;letter-spacing:.1em}
  .hero h1{margin-top:18px;font-size:clamp(50px,15vw,68px);line-height:1.01;letter-spacing:-.045em}
  html[lang="zh-CN"] .hero h1{font-size:clamp(46px,13.5vw,60px);line-height:1.06}
  .hero-lead{margin-top:24px;font-size:17px;line-height:1.65}
  .hero-scope{margin-top:14px;font-size:15px;line-height:1.65}
  .hero-proof{margin-top:42px;padding-top:8px}
  .hero-proof>div{grid-template-columns:1fr;gap:8px;padding:18px 0}
  .proof-label{font-size:11px}
  .hero-proof p{font-size:14px}
  .section{padding:66px 22px;gap:28px}
  .section-heading h2{font-size:36px;line-height:1.12}
  .section-intro{font-size:17px;line-height:1.72}
  .principles{margin-top:34px}
  .principles h3{font-size:17px}
  .principles p{font-size:14px}
  .engineering-qualities{margin-top:32px;grid-template-columns:1fr}
  .engineering-qualities span,.engineering-qualities span:nth-child(2),.engineering-qualities span:nth-child(3),.engineering-qualities span:nth-child(4){padding:16px 0;border-left:0;border-top:1px solid #41617a;font-size:14px}
  .engineering-qualities span:first-child{border-top:0}
  .scope-grid{grid-template-columns:1fr}
  .scope-grid article,.scope-grid article+article{padding:24px 0;border-left:0}
  .scope-grid article+article{border-top:1px solid #41617a}
  .scope-grid h3{font-size:22px}
  .scope-grid p{font-size:14px}
  .site-footer{grid-template-columns:1fr;gap:8px;padding:26px 22px;font-size:13px}
  .site-footer span:nth-child(2){text-align:left}
}
@media(max-width:360px){
  .site-header{margin:0 18px}
  .brand img{width:124px}
  .header-actions{justify-content:space-between}
  .hero{padding-left:18px;padding-right:18px}
  .hero h1{font-size:49px}
  html[lang="zh-CN"] .hero h1{font-size:44px}
  .section{padding-left:18px;padding-right:18px}
  .section-heading h2{font-size:33px}
}
@media(prefers-reduced-motion:reduce){
  html{scroll-behavior:auto}
  *,*::before,*::after{animation:none!important;transition:none!important}
}