html{scroll-behavior:smooth;scroll-padding-top:80px}
body{margin:0;background:#0B0F14}
.px{--ink:#0B0F14;--graphite:#1A2129;--paper:#F4F2EE;--mist:#C9CED4;--current:#2BD4C4;--copper:#C8814A;--signal:#F2C14E;--muted:#4F5863;--onDark:#EDEFF1;width:100%;font-family:'Inter',system-ui,sans-serif;font-size:17px;line-height:1.6;color:var(--ink);background:var(--paper);-webkit-font-smoothing:antialiased}
.px *{box-sizing:border-box}
.px a{color:inherit;text-decoration:none}
.px a:focus-visible,.px button:focus-visible,.px input:focus-visible,.px select:focus-visible,.px textarea:focus-visible{outline:2px solid var(--current);outline-offset:3px}
.wrap{max-width:1240px;margin:0 auto;padding:0 48px}
.ink{background:var(--ink);color:var(--onDark)}
.graph{background:var(--graphite);color:var(--onDark)}
.paper{background:var(--paper);color:var(--ink)}
.stone{background:#E7E3DC;color:var(--ink)}
.disp{font-family:'Inter Tight','Inter',sans-serif;font-weight:600;letter-spacing:-0.035em;line-height:0.98;margin:0}
.em{font-family:'Instrument Serif','Fraunces',Georgia,serif;font-style:italic;font-weight:400;letter-spacing:0;color:var(--current)}
.paper .em,.stone .em{color:#0E7D73}
.mono{font-family:'JetBrains Mono','IBM Plex Mono',ui-monospace,monospace;font-size:13px;letter-spacing:.02em}
.lede{font-size:19px;max-width:620px;margin:0}
.sub{color:var(--mist)}
.paper .sub,.stone .sub{color:var(--muted)}
.btn{display:inline-flex;white-space:nowrap;align-items:center;justify-content:center;min-height:50px;padding:0 26px;border-radius:3px;font-weight:600;font-size:16px;border:1px solid transparent;cursor:pointer;font-family:inherit}
.btn-p{background:var(--current);color:var(--ink)}
.btn-p:hover{background:#5FE3D6}
.btn-g{border-color:rgba(201,206,212,.45);color:var(--onDark)}
.btn-g:hover{border-color:var(--onDark)}
.paper .btn-g,.stone .btn-g{border-color:rgba(11,15,20,.35);color:var(--ink)}
.tlink{font-weight:600;border-bottom:1px solid currentColor;padding-bottom:2px}
.nav{position:sticky;top:0;z-index:5;background:rgba(11,15,20,.88);backdrop-filter:blur(10px);-webkit-backdrop-filter:blur(10px);border-bottom:1px solid rgba(201,206,212,.12);color:var(--onDark)}
.navin{display:flex;align-items:center;gap:32px;min-height:72px}
.logo{font-family:'Inter Tight',sans-serif;font-weight:700;font-size:21px;letter-spacing:-.02em;display:flex;align-items:center;gap:10px}
.logo b{color:var(--current)}
.navlinks{display:flex;gap:24px;white-space:nowrap;font-size:15px;color:var(--mist);flex-grow:1}
.navlinks a:hover{color:var(--onDark)}
.lang{display:flex;flex-shrink:0;white-space:nowrap;gap:2px;font-size:13px;border:1px solid rgba(201,206,212,.3);border-radius:3px;padding:3px}
.lang a,.lang span{padding:6px 10px;border-radius:2px;min-width:40px;text-align:center}
.lang span{background:var(--onDark);color:var(--ink);font-weight:600}
.lang a{color:var(--mist)}
.lang a:hover{color:var(--onDark)}
.hero{padding:112px 0 0}
.h1{font-size:clamp(64px,9.5vw,148px)}
.h2{font-size:clamp(40px,5.4vw,76px)}
.h3{font-size:clamp(36px,4.2vw,58px)}
.fn{font-size:13px;color:var(--mist);max-width:640px}
.paper .fn,.stone .fn{color:var(--muted)}
.row{display:flex;gap:14px;flex-wrap:wrap}
.olsvg{width:100%;height:auto;display:block}
.flow{stroke-dasharray:5 11;animation:flow 1.8s linear infinite}
@keyframes flow{to{stroke-dashoffset:-32}}
@media (prefers-reduced-motion:reduce){.flow{animation:none}}
.pss{display:grid;grid-template-columns:repeat(3,minmax(0,1fr));gap:48px}
.pss>div{border-top:1px solid rgba(201,206,212,.25);padding-top:28px}
.num{font-family:'JetBrains Mono',monospace;font-size:44px;font-weight:400;color:var(--current);line-height:1;margin-bottom:28px}
.cap{display:grid;grid-template-columns:minmax(0,5fr) minmax(0,6fr);gap:72px;align-items:center;padding-top:120px;padding-bottom:120px}
.panel{background:#10161D;border:1px solid rgba(201,206,212,.14);border-radius:6px;padding:28px;color:var(--onDark)}
.capno{display:flex;gap:14px;align-items:baseline;margin-bottom:22px;color:var(--mist)}
.paper .capno{color:var(--muted)}
.steps{display:grid;grid-template-columns:repeat(3,minmax(0,1fr));gap:0;border-top:1px solid rgba(201,206,212,.2)}
.step{padding:32px 32px 40px 0;border-bottom:1px solid rgba(201,206,212,.2)}
.step h3{font-family:'Inter Tight','Noto Sans SC',sans-serif;font-size:24px;margin:14px 0 8px;font-weight:600}
.step p{margin:0;color:var(--mist);max-width:320px}
.sol{display:grid;grid-template-columns:repeat(3,minmax(0,1fr));gap:40px}
.sol>div{display:flex;flex-direction:column;gap:14px;border-top:2px solid var(--ink);padding-top:24px}
.sol h3{font-family:'Inter Tight','Noto Sans SC',sans-serif;font-size:26px;line-height:1.2;margin:0;font-weight:600}
.sol p{margin:0;flex-grow:1}
table.cfg{width:100%;border-collapse:collapse;font-size:16px}
.cfg th{text-align:left;font-weight:500;color:var(--muted);font-size:13px;font-family:'JetBrains Mono',monospace;padding:0 16px 14px 0;border-bottom:1px solid rgba(11,15,20,.3)}
.cfg td{padding:26px 16px 26px 0;border-bottom:1px solid rgba(11,15,20,.15);vertical-align:top}
.cfg td:first-child{font-family:'Inter Tight','Noto Sans SC',sans-serif;font-weight:600;font-size:24px;width:26%}
.cfg td:nth-child(2){font-family:'JetBrains Mono',monospace;font-size:15px;width:30%}
.aud{display:grid;grid-template-columns:repeat(2,minmax(0,1fr));gap:0}
.aud>div{padding:40px 48px 44px 0;border-top:1px solid rgba(201,206,212,.2)}
.aud h3{font-family:'Inter Tight','Noto Sans SC',sans-serif;font-size:28px;margin:10px 0 10px;font-weight:600;line-height:1.2}
.aud p{margin:0;color:var(--mist);max-width:460px}
.form{display:grid;grid-template-columns:repeat(2,minmax(0,1fr));gap:18px 20px}
.field{display:flex;flex-direction:column;gap:8px}
.field label{font-size:14px;color:var(--mist)}
.field input,.field select,.field textarea{font-family:inherit;font-size:16px;color:var(--onDark);background:#10161D;border:1px solid rgba(201,206,212,.3);border-radius:3px;min-height:50px;padding:12px 14px}
.field textarea{min-height:110px;resize:vertical}
.full{grid-column:1 / -1}
.foot{padding:64px 0 48px;font-size:15px;color:var(--mist)}
.foot a:hover{color:var(--onDark)}
.footgrid{display:flex;justify-content:space-between;gap:40px;flex-wrap:wrap}
.footlinks{display:flex;gap:22px;flex-wrap:wrap}
@media (max-width:980px){
.wrap{padding:0 24px}
.navin{justify-content:space-between}
.pss,.steps,.sol,.aud,.form{grid-template-columns:minmax(0,1fr)}
.cap{grid-template-columns:minmax(0,1fr);gap:40px;padding-top:80px;padding-bottom:80px}
.hero{padding-top:72px}
.cfg td:first-child{font-size:19px}
}

@media (prefers-reduced-motion:reduce){html{scroll-behavior:auto}}
/* Chinese overrides */
html[lang="zh-Hans"] .px{font-family:'Inter','Noto Sans SC','PingFang SC','Microsoft YaHei',sans-serif}
html[lang="zh-Hans"] .disp{font-family:'Inter Tight','Noto Sans SC','PingFang SC',sans-serif;letter-spacing:-0.01em;line-height:1.12}
html[lang="zh-Hans"] .em{font-family:'Instrument Serif','Noto Serif SC',serif;font-style:normal;font-weight:600}
html[lang="zh-Hans"] .h1{font-size:clamp(52px,8vw,124px)}
html[lang="zh-Hans"] .h2{font-size:clamp(32px,4.4vw,62px)}
html[lang="zh-Hans"] .h3{font-size:clamp(28px,3.4vw,48px)}

/* nav breakpoints */
@media (max-width:1240px){.navlinks{display:none}.navin{justify-content:space-between}}
@media (max-width:720px){.navcta{display:none}}
/* diagrams stay legible on small screens: scroll sideways inside their box */
.hero .olwrap,.panel{overflow-x:auto;-webkit-overflow-scrolling:touch}
@media (max-width:980px){.hero .olwrap .olsvg{min-width:760px}.panel .olsvg{min-width:460px}.panel{padding:20px}}
.logo span{white-space:nowrap}




/* v3 additions */
.skip{position:absolute;left:-9999px;top:8px;z-index:10;background:#2BD4C4;color:#0B0F14;padding:10px 14px;font:600 14px Inter,sans-serif}
.skip:focus{left:8px}
.nw{white-space:nowrap}
.navlinks{align-items:center}
.dd{position:relative}
.dd>button{background:none;border:0;color:inherit;font:inherit;cursor:pointer;display:inline-flex;align-items:center;gap:7px;padding:0;min-height:44px}
.dd>button:hover,.dd:focus-within>button{color:var(--onDark)}
.ddmenu{position:absolute;top:100%;left:-14px;min-width:210px;padding-top:10px;display:none;z-index:6}
.ddmenu::before{content:"";position:absolute;inset:10px 0 0 0;background:#10161D;border:1px solid rgba(201,206,212,.18);border-radius:6px;box-shadow:0 18px 40px rgba(0,0,0,.45)}
.ddmenu a{position:relative;display:block;padding:11px 14px;margin:0 6px;border-radius:4px;color:var(--mist)}
.ddmenu a:first-child{margin-top:6px}.ddmenu a:last-child{margin-bottom:6px}
.ddmenu a:hover,.ddmenu a:focus-visible{background:rgba(43,212,196,.1);color:var(--onDark)}
.dd:hover .ddmenu,.dd:focus-within .ddmenu{display:block}
.footcols{display:grid;grid-template-columns:repeat(3,minmax(0,auto));gap:0 64px}
.footcols>div{display:flex;flex-direction:column;gap:12px}
.foot .mono a{color:var(--onDark);border-bottom:1px solid rgba(201,206,212,.35)}
@media (max-width:600px){.footcols{grid-template-columns:repeat(3,minmax(0,1fr));gap:0 20px}}
.illus img{width:100%;height:auto;display:block}
.eyebrow{font-family:'JetBrains Mono',monospace;font-size:13px;letter-spacing:.06em;text-transform:uppercase;color:#0E7D73}
.hero{padding:96px 0 0}
.herogrid{display:grid;grid-template-columns:minmax(0,5fr) minmax(0,7fr);gap:40px;align-items:center}
.herotext{display:flex;flex-direction:column;gap:32px;position:relative;z-index:1}
.heroimg{margin:0 -48px 0 0}
.herogrid .h1{font-size:clamp(56px,6.2vw,100px)}
html[lang="zh-Hans"] .herogrid .h1{font-size:clamp(48px,5.6vw,92px)}
#sst figure{max-width:1040px;margin:0 auto;width:100%}
.herochips{display:flex;gap:12px;flex-wrap:wrap;padding-top:24px;padding-bottom:80px}
.chip{display:inline-flex;align-items:center;gap:10px;font-family:'JetBrains Mono','Noto Sans SC',monospace;font-size:13px;color:var(--mist);border:1px solid rgba(201,206,212,.2);border-radius:999px;padding:8px 14px}
.chip i{width:8px;height:8px;border-radius:50%;display:inline-block}
.split{display:grid;grid-template-columns:minmax(0,1fr) minmax(0,1fr);gap:64px}
.cmpcap{display:grid;grid-template-columns:57fr 43fr;gap:24px;font-family:'JetBrains Mono','Noto Sans SC',monospace;font-size:13px;color:var(--muted);margin-top:8px}
.cmpcap .on{color:#0E7D73}
.adv{display:grid;grid-template-columns:repeat(4,minmax(0,1fr));gap:32px}
.adv>div{border-top:2px solid var(--ink);padding-top:20px;display:flex;flex-direction:column;gap:10px}
.adv .mono{color:#0E7D73}
.adv h3{font-family:'Inter Tight','Noto Sans SC',sans-serif;font-size:22px;line-height:1.25;margin:0;font-weight:600}
.adv p{margin:0;color:var(--muted);font-size:16px}
.layers{display:grid;grid-template-columns:minmax(0,7fr) minmax(0,5fr);gap:64px;align-items:center}
.layerlist,.loopsteps,.steps{list-style:none;margin:0;padding:0}
.layerlist{display:flex;flex-direction:column}
.layerlist li{padding:28px 0;border-top:1px solid rgba(201,206,212,.2)}
.layerlist li:last-child{border-bottom:1px solid rgba(201,206,212,.2)}
.layerlist h3,.loopsteps h3{font-family:'Inter Tight','Noto Sans SC',sans-serif;font-size:26px;margin:8px 0 8px;font-weight:600;line-height:1.2}
.layerlist p,.loopsteps p{margin:0;color:var(--mist)}
.loopgrid{display:grid;grid-template-columns:minmax(0,5fr) minmax(0,6fr);gap:64px;align-items:center}
.loopsteps{display:flex;flex-direction:column;gap:22px}
.loopsteps li{display:grid;grid-template-columns:14px minmax(0,1fr);gap:18px}
.loopsteps .dot{width:12px;height:12px;border-radius:50%;margin-top:12px}
.loopsteps h3{margin-top:0}
.callout{margin:0;padding:20px 22px;border-left:3px solid var(--current);background:rgba(43,212,196,.07);font-size:18px;color:var(--onDark)}
.solimg{margin:0 0 8px;background:#EAE6DF;border-radius:6px;padding:12px;aspect-ratio:4/3;display:flex;align-items:center;justify-content:center}
.solimg img{max-width:100%;max-height:100%;width:auto;height:auto;display:block}
.sol>div{border-top:none;padding-top:0}
.sol>div>.mono{border-top:2px solid var(--ink);padding-top:16px}
@media (max-width:1100px){.adv{grid-template-columns:repeat(2,minmax(0,1fr))}}
@media (max-width:980px){
.herogrid,.split,.layers,.loopgrid{grid-template-columns:minmax(0,1fr);gap:32px}
.heroimg{margin:0 -12px}
.hero{padding-top:64px}
.adv{grid-template-columns:minmax(0,1fr)}
.cmpcap{grid-template-columns:minmax(0,1fr);gap:4px}
}