:root{
  --paper:#f7f9fc;
  --white:#ffffff;
  --ink:#101a2e;
  --muted:#68738a;
  --line:#dce3ef;
  --line-strong:#b9c5d8;
  --blue:#165dff;
  --blue-deep:#0a3b9e;
  --blue-wash:#eaf1ff;
  --display:"Segoe UI Variable Display","Microsoft YaHei UI",sans-serif;
  --body:"Microsoft YaHei UI","Segoe UI",sans-serif;
  --utility:"Cascadia Mono","SFMono-Regular",Consolas,monospace;
}
*{box-sizing:border-box}
html{scroll-behavior:smooth}
body{margin:0;color:var(--ink);background:var(--paper);font-family:var(--body);line-height:1.7}
body::before{content:"";position:fixed;inset:0;z-index:-2;pointer-events:none;background:linear-gradient(90deg,transparent calc(50% - .5px),rgba(22,93,255,.055) 50%,transparent calc(50% + .5px))}
a{color:inherit;text-decoration:none}
img{max-width:100%}
.shell{width:min(1200px,calc(100% - 48px));margin-inline:auto}
.site-header{position:sticky;top:0;z-index:30;border-bottom:1px solid rgba(185,197,216,.7);background:rgba(247,249,252,.88);backdrop-filter:blur(18px)}
.nav{min-height:74px;display:flex;align-items:center;justify-content:space-between;gap:24px}
.brand{display:inline-flex;align-items:center;gap:10px;font:700 21px/1 var(--display);letter-spacing:-.03em;white-space:nowrap}
.brand img{width:32px;height:32px;object-fit:contain}
.nav-links{display:flex;align-items:center;gap:26px;font-size:14px;color:#4f5b72;white-space:nowrap}
.nav-links a{position:relative}
.nav-links a::after{content:"";position:absolute;left:0;right:100%;bottom:-8px;height:1px;background:var(--blue);transition:right .2s ease}
.nav-links a:hover::after{right:0}
.cta,.primary-link{
  display:inline-flex;align-items:center;justify-content:center;min-width:132px;min-height:46px;padding:0 22px;
  border:1px solid var(--blue);border-radius:999px;background:var(--blue);color:#fff;font-weight:700;
  white-space:nowrap;word-break:keep-all;writing-mode:horizontal-tb;transition:transform .2s ease,background .2s ease
}
.cta:hover,.primary-link:hover{transform:translateY(-2px);background:var(--blue-deep)}
a:focus-visible,summary:focus-visible{outline:3px solid rgba(22,93,255,.35);outline-offset:4px}
.flagship-main{overflow:hidden}
.hero{padding:clamp(70px,9vw,132px) 0 56px}
.hero-shell{display:grid;justify-items:center;text-align:center}
.eyebrow{margin:0 0 18px;color:var(--blue);font:700 12px/1.4 var(--utility);letter-spacing:.16em;text-transform:uppercase}
.hero h1{max-width:980px;margin:0;font:620 clamp(46px,7.4vw,98px)/.98 var(--display);letter-spacing:-.065em}
.hero-intro{max-width:670px;margin:26px auto 28px;color:var(--muted);font-size:clamp(17px,2vw,20px)}
.hero-actions{display:flex;align-items:center;justify-content:center;gap:18px}
.text-link{display:inline-flex;align-items:center;gap:8px;color:var(--blue-deep);font-weight:700}
.text-link::after{content:"→";transition:transform .2s ease}
.text-link:hover::after{transform:translateX(4px)}
.stage{width:min(1060px,100%);margin:clamp(56px,8vw,96px) auto 0}
.stage-toolbar{display:grid;grid-template-columns:1fr auto 1fr;align-items:center;padding:0 16px 14px;border-bottom:1px solid var(--line-strong)}
.stage-label{justify-self:start;color:var(--muted);font:600 11px/1 var(--utility);letter-spacing:.1em}
.viewport-switch{display:flex;align-items:center;gap:6px;padding:5px;border:1px solid var(--line);border-radius:999px;background:var(--white)}
.viewport-switch span{padding:5px 12px;border-radius:999px;color:var(--muted);font:600 10px/1 var(--utility);letter-spacing:.05em}
.viewport-switch .is-active{background:var(--blue);color:#fff}
.stage-scale{justify-self:end;color:var(--muted);font:600 11px/1 var(--utility)}
.stage-ruler{height:22px;background:repeating-linear-gradient(90deg,var(--line-strong) 0 1px,transparent 1px 24px);mask:linear-gradient(#000 0 8px,transparent 8px)}
.product-stage{position:relative;display:grid;place-items:center;min-height:420px;padding:36px 9%;border:1px solid var(--line);border-top:0;background:linear-gradient(180deg,#fff,#f0f4fa)}
.product-stage::before,.product-stage::after{content:"";position:absolute;top:22px;bottom:22px;width:1px;background:var(--line)}
.product-stage::before{left:7%}.product-stage::after{right:7%}
.product-stage img{display:block;width:min(760px,100%);height:auto;min-height:0;max-height:none;margin:0;padding:0;object-fit:contain;object-position:center;clip-path:none;transform:none;filter:drop-shadow(0 28px 40px rgba(21,46,90,.12))}
.stage-caption{display:flex;justify-content:space-between;gap:20px;margin-top:13px;color:var(--muted);font:600 11px/1.5 var(--utility)}
.narrative-intro{padding:clamp(110px,15vw,190px) 0 clamp(70px,10vw,120px)}
.intro-grid{display:grid;grid-template-columns:.72fr 1.28fr;gap:clamp(44px,10vw,150px);align-items:start}
.intro-grid h2{max-width:670px;margin:0;font:600 clamp(38px,5.8vw,72px)/1.02 var(--display);letter-spacing:-.055em}
.intro-copy{max-width:560px;margin:8px 0 0;color:var(--muted);font-size:18px}
.device-story{position:relative;padding:clamp(80px,11vw,140px) 0;border-top:1px solid var(--line)}
.device-story::before{content:attr(data-viewport);position:absolute;top:26px;right:max(24px,calc((100vw - 1200px)/2));color:rgba(16,26,46,.055);font:650 clamp(72px,15vw,210px)/1 var(--display);letter-spacing:-.08em;pointer-events:none}
.story-meta{position:relative;display:flex;align-items:center;gap:12px;margin-bottom:34px;color:var(--blue);font:700 11px/1 var(--utility);letter-spacing:.12em}
.story-meta::before{content:"";width:34px;height:1px;background:var(--blue)}
.story-copy h2{margin:0;font:600 clamp(36px,5vw,64px)/1.04 var(--display);letter-spacing:-.05em}
.story-copy>p{max-width:560px;margin:20px 0 0;color:var(--muted);font-size:17px}
.desktop-layout{display:grid;grid-template-columns:minmax(0,1.12fr) minmax(330px,.88fr);gap:clamp(48px,9vw,120px);align-items:center}
.desktop-visual{align-self:center;margin:0;padding:0}
.desktop-visual img,.tablet-product img,.mobile-product img{display:block;width:100%;height:auto;min-height:0;max-height:none;margin:0;padding:0;object-fit:contain;object-position:center;clip-path:none;transform:none}
.flow-line{margin:42px 0 0;padding:0;list-style:none;border-top:1px solid var(--line-strong)}
.flow-line li{display:grid;grid-template-columns:46px 1fr;gap:18px;padding:20px 0;border-bottom:1px solid var(--line)}
.flow-line b{color:var(--blue);font:700 12px/1.7 var(--utility)}
.flow-line strong{display:block;margin-bottom:4px;font-size:17px}
.flow-line span{display:block;color:var(--muted);font-size:14px}
.tablet-story{background:var(--white)}
.tablet-layout{display:grid;grid-template-columns:.78fr 1.22fr;gap:clamp(48px,9vw,130px);align-items:start}
.tablet-demo{display:grid;grid-template-columns:1fr 86px;gap:0;border:1px solid var(--line-strong);background:var(--paper)}
.tablet-product{display:grid;place-items:center;min-height:500px;padding:48px}
.tablet-rail{display:flex;flex-direction:column;border-left:1px solid var(--line-strong);background:var(--white)}
.tablet-rail span{display:grid;place-items:center;flex:1;border-bottom:1px solid var(--line);color:var(--muted);font:700 10px/1 var(--utility);writing-mode:vertical-rl;letter-spacing:.12em}
.tablet-rail span:last-child{border-bottom:0;color:var(--blue)}
.tablet-copy{padding-top:70px}
.tablet-steps{display:grid;gap:0;margin-top:46px}
.tablet-steps div{display:grid;grid-template-columns:94px 1fr;gap:20px;padding:22px 0;border-top:1px solid var(--line)}
.tablet-steps small{color:var(--blue);font:700 11px/1.8 var(--utility)}
.tablet-steps p{margin:0;color:var(--muted)}
.mobile-layout{display:grid;grid-template-columns:minmax(280px,.72fr) minmax(0,1.28fr);gap:clamp(54px,12vw,170px);align-items:center}
.mobile-device{position:relative;justify-self:center;width:min(380px,100%);padding:18px;border:1px solid var(--line-strong);border-radius:44px;background:var(--white);box-shadow:0 34px 80px rgba(24,47,88,.10)}
.mobile-device::before{content:"";display:block;width:76px;height:5px;margin:0 auto 18px;border-radius:999px;background:var(--line-strong)}
.mobile-product{overflow:hidden;border-radius:26px;background:var(--blue-wash)}
.mobile-flow{margin-top:50px}
.mobile-flow article{display:grid;grid-template-columns:86px 1fr;gap:26px;padding:25px 0;border-top:1px solid var(--line)}
.mobile-flow code{color:var(--blue);font:700 11px/1.7 var(--utility)}
.mobile-flow h3{margin:0 0 6px;font:650 19px/1.3 var(--display)}
.mobile-flow p{margin:0;color:var(--muted)}
.continuity{padding:clamp(100px,15vw,190px) 0;background:var(--ink);color:#fff}
.continuity-head{display:grid;grid-template-columns:.8fr 1.2fr;gap:60px;align-items:end}
.continuity h2{max-width:720px;margin:0;font:580 clamp(42px,6vw,76px)/1.02 var(--display);letter-spacing:-.055em}
.continuity-head p{max-width:480px;margin:0;color:#adb8ca;font-size:17px}
.continuity-track{position:relative;display:grid;grid-template-columns:repeat(4,1fr);margin-top:80px;border-top:1px solid #41506a}
.continuity-track::before{content:"";position:absolute;top:-2px;left:0;width:75%;height:3px;background:var(--blue)}
.continuity-track article{min-height:210px;padding:28px 28px 0 0;border-right:1px solid #41506a}
.continuity-track article+article{padding-left:28px}
.continuity-track article:last-child{border-right:0}
.continuity-track span{display:block;margin-bottom:54px;color:#7297ff;font:700 11px/1 var(--utility)}
.continuity-track h3{margin:0 0 10px;font-size:18px}
.continuity-track p{margin:0;color:#9ba8bc;font-size:14px}
.feature-ledger{padding:clamp(100px,13vw,160px) 0;background:var(--white)}
.ledger-head{display:grid;grid-template-columns:1fr 1fr;gap:50px;margin-bottom:70px}
.ledger-head h2{margin:0;font:600 clamp(38px,5vw,64px)/1.04 var(--display);letter-spacing:-.05em}
.ledger-head p{max-width:520px;margin:8px 0 0;color:var(--muted)}
.ledger-row{display:grid;grid-template-columns:84px .72fr 1.28fr;gap:30px;align-items:start;padding:28px 0;border-top:1px solid var(--line)}
.ledger-row:last-child{border-bottom:1px solid var(--line)}
.ledger-row code{color:var(--blue);font:700 11px/1.9 var(--utility)}
.ledger-row h3{margin:0;font:620 22px/1.4 var(--display)}
.ledger-row p{max-width:620px;margin:0;color:var(--muted)}
.insights{padding:clamp(100px,13vw,160px) 0}
.insights h2{max-width:760px;margin:0 0 64px;font:600 clamp(38px,5vw,64px)/1.05 var(--display);letter-spacing:-.05em}
.insight-row{display:grid;grid-template-columns:150px 1fr auto;gap:32px;align-items:center;padding:26px 0;border-top:1px solid var(--line)}
.insight-row:last-child{border-bottom:1px solid var(--line)}
.insight-row span{color:var(--blue);font:700 11px/1 var(--utility)}
.insight-row h3{margin:0;font:620 20px/1.35 var(--display)}
.insight-row p{margin:0;color:var(--muted);font-size:14px}
.faq-strip{padding:clamp(90px,12vw,150px) 0;background:var(--white)}
.faq-layout{display:grid;grid-template-columns:.72fr 1.28fr;gap:clamp(50px,10vw,140px)}
.faq-layout h2{margin:0;font:600 clamp(38px,5vw,62px)/1.05 var(--display);letter-spacing:-.05em}
.faq-list details{border-top:1px solid var(--line)}
.faq-list details:last-child{border-bottom:1px solid var(--line)}
.faq-list summary{cursor:pointer;list-style:none;padding:24px 36px 24px 0;font-weight:700}
.faq-list summary::-webkit-details-marker{display:none}
.faq-list summary::after{content:"＋";float:right;color:var(--blue);font-weight:400}
.faq-list details[open] summary::after{content:"－"}
.faq-list p{margin:-6px 0 24px;color:var(--muted)}
.final-cta{padding:clamp(90px,13vw,170px) 0;text-align:center;background:linear-gradient(180deg,var(--white),var(--blue-wash))}
.final-cta h2{max-width:890px;margin:0 auto 20px;font:600 clamp(42px,6.5vw,82px)/1 var(--display);letter-spacing:-.06em}
.final-cta p{max-width:600px;margin:0 auto 30px;color:var(--muted)}
.site-footer{padding:54px 0 28px;border-top:1px solid var(--line);background:var(--paper)}
.footer-grid{display:grid;grid-template-columns:1.4fr .7fr .7fr;gap:40px}
.footer-grid h2,.footer-grid h3{margin-top:0}
.footer-grid p,.footer-grid a{color:var(--muted)}
.footer-grid p{max-width:430px}
.footer-grid a{display:block;margin:8px 0}
.footer-grid a:hover{color:var(--blue)}
.copyright{margin-top:32px;padding-top:22px;border-top:1px solid var(--line);color:var(--muted);font-size:13px}
@media(max-width:920px){
  .shell{width:min(100% - 32px,1200px)}
  .nav{padding:13px 0;flex-wrap:wrap}.nav-links{order:3;width:100%;overflow-x:auto;padding-bottom:5px}
  .intro-grid,.desktop-layout,.tablet-layout,.mobile-layout,.continuity-head,.ledger-head,.faq-layout{grid-template-columns:1fr}
  .desktop-visual{max-width:720px}.tablet-copy{padding-top:0}.tablet-demo{max-width:720px}
  .mobile-device{justify-self:start}.continuity-track{grid-template-columns:1fr 1fr}.continuity-track::before{width:50%}
  .continuity-track article:nth-child(2){border-right:0}.continuity-track article:nth-child(n+3){border-top:1px solid #41506a}
  .insight-row{grid-template-columns:100px 1fr}.insight-row p{grid-column:2}
}
@media(max-width:640px){
  .shell{width:min(100% - 24px,1200px)}.nav>.cta{display:none}.nav-links{gap:20px}
  .hero{padding-top:56px}.hero h1{font-size:clamp(42px,13vw,58px)}.hero-actions{width:100%;display:grid}.hero-actions a{width:100%}
  .stage-toolbar{grid-template-columns:1fr}.stage-label,.stage-scale{display:none}.product-stage{min-height:250px;padding:24px 8%}.stage-caption{display:none}
  .narrative-intro{padding-top:100px}.intro-grid h2{font-size:40px}
  .device-story{padding:100px 0}.device-story::before{top:42px;font-size:70px}
  .tablet-demo{grid-template-columns:1fr 58px}.tablet-product{min-height:350px;padding:24px}
  .mobile-device{width:min(310px,100%);border-radius:34px}.mobile-flow article,.tablet-steps div{grid-template-columns:64px 1fr;gap:14px}
  .continuity-track{grid-template-columns:1fr}.continuity-track::before{width:100%}.continuity-track article,.continuity-track article:nth-child(2){border-right:0;border-top:1px solid #41506a;padding-left:0}
  .continuity-track article:first-child{border-top:0}.continuity-track article+article{padding-left:0}
  .ledger-row{grid-template-columns:50px 1fr;gap:14px}.ledger-row p{grid-column:2}
  .insight-row{grid-template-columns:1fr;gap:8px}.insight-row p{grid-column:auto}
  .footer-grid{grid-template-columns:1fr 1fr}.footer-grid>div:first-child{grid-column:1/3}
}
@media(prefers-reduced-motion:reduce){html{scroll-behavior:auto}.cta,.primary-link,.text-link::after{transition:none}}

/* Required final image safety override */
.hero-shell{align-items:center}
.product-stage,.desktop-visual,.tablet-product,.mobile-product{align-self:center;height:auto;padding-top:0;padding-bottom:0;margin-top:0;margin-bottom:0;overflow:visible;transform:none}
.product-stage img,.desktop-visual img,.tablet-product img,.mobile-product img{display:block;width:100%;height:auto;min-height:0;max-height:none;margin:0;padding:0;object-fit:contain;object-position:center;clip-path:none;transform:none}
.product-stage{padding-left:9%;padding-right:9%;padding-top:36px;padding-bottom:36px}
.tablet-product{padding:48px}
@media(max-width:640px){.product-stage{padding:24px 8%}.tablet-product{padding:24px}}