:root{--ink:#1c1d1f;--ink2:#2e3238;--muted:#636c7a;--soft:#6f7988;--faint:#9aa1ad;--line:#e6e9ee;--line2:#edeff3;--bg:#fafafb;--panel:#f5f6f8;--blue:#245bc2;--tag:#e8f0ff;--green:#1a7f45;--greenbg:#e7f6ec;--amber:#a85a00;--amberbg:#fff3e2;--ease:cubic-bezier(.2,0,0,1);--hdr:100px}
*{box-sizing:border-box}
html{scroll-behavior:smooth}
body{margin:0;background:var(--bg);color:var(--ink);font-family:Inter,-apple-system,system-ui,sans-serif;font-optical-sizing:auto;-webkit-font-smoothing:antialiased;font-size:16px;font-weight:500;letter-spacing:-0.16px}
a{color:var(--blue)}a:hover{color:#1b4799}
.tn{font-variant-numeric:tabular-nums}
button{font-family:inherit}
a:focus-visible,button:focus-visible,input:focus-visible{outline:2px solid var(--blue);outline-offset:2px}
.btn{display:inline-flex;align-items:center;height:32px;padding:0 10px;border-radius:10px;font-size:14px;text-decoration:none;transition:background-color .3s var(--ease),border-color .3s var(--ease),color .3s var(--ease),transform .1s ease}
.btn:active{transform:translateY(1px)}
.btn-p{background:#202124;border:1px solid #505967;color:#f3f4f6}.btn-p:hover{background:#3a3d43;color:#f3f4f6}
.btn-s{background:#fff;border:1px solid #cad0d9;color:var(--ink2)}.btn-s:hover{background:#f3f4f6;border-color:#b9c0ca;color:var(--ink)}
.btn-g{color:var(--ink2)}.btn-g:hover{background:#eef0f3;color:var(--ink)}
.tag{align-self:flex-start;padding:0 6px;border-radius:8px;background:var(--tag);color:var(--blue);font-size:14px;line-height:22px}
.chip{display:inline-block;padding:0 6px;border-radius:8px;font-size:12px;line-height:20px}
.chip-g{background:var(--greenbg);color:var(--green)}.chip-a{background:var(--amberbg);color:var(--amber)}.chip-n{background:#f1f2f4;color:var(--ink2)}
.code{padding:1px 6px;border-radius:6px;background:#f1f2f4;font-size:12px;font-variant-numeric:tabular-nums}
.site-header{position:sticky;top:0;z-index:50}
.announce{display:flex;justify-content:center;align-items:center;gap:6px;min-height:36px;padding:0 16px;background:#0d0e10;color:#f3f4f6;font-size:13px;text-decoration:none;text-align:center}
.announce:hover{color:#fff}
.nav{background:#fff;border-bottom:1px solid var(--line2)}
.nav-in{max-width:1200px;margin:0 auto;padding:0 24px;min-height:64px;display:flex;flex-wrap:wrap;align-items:center;justify-content:space-between;gap:12px 24px}
.logo{display:inline-flex;align-items:center;gap:8px;font-size:21px;font-weight:650;letter-spacing:-0.6px;color:var(--ink);text-decoration:none}
.logo::before{content:'';flex:none;width:30px;height:30px;margin:-2px 0;background:url(/logo-mark.svg) center/contain no-repeat}
.nav-links{display:flex;gap:22px;font-size:15px;flex-wrap:wrap}
.nav-links a{color:var(--ink2);text-decoration:none;transition:color .3s var(--ease)}.nav-links a:hover{color:var(--ink)}
.hero{position:relative;background:#fff;padding:88px 24px 72px;display:flex;flex-direction:column;align-items:center;gap:24px;text-align:center}
.pill{display:inline-flex;align-items:center;gap:4px;height:28px;padding:0 10px;border:1px solid var(--line2);border-radius:13px;color:var(--ink);font-size:13px;text-decoration:none;background:#fff;transition:background-color .3s var(--ease)}
.pill:hover{background:#f3f4f6;color:var(--ink)}
.hero h1{margin:0;font-size:clamp(44px,8vw,80px);line-height:.95;font-weight:600;letter-spacing:-.03em;max-width:980px}
.hero p{margin:0;font-size:18px;line-height:1.3;letter-spacing:-.18px;color:var(--soft);max-width:40ch}
.enter{opacity:0;filter:blur(10px);transform:translateY(8px);animation:enter .9s var(--ease) forwards}
@keyframes enter{to{opacity:1;filter:blur(0);transform:none}}
.stage{position:relative;z-index:1;padding:120px 24px 150px;overflow:hidden;background-color:#e6ecff;background-image:linear-gradient(#fff,rgba(255,255,255,0) 64px),repeating-linear-gradient(90deg,rgba(255,255,255,.5) 0,rgba(255,255,255,.5) 1px,transparent 1px,transparent 8px),radial-gradient(90% 80% at 50% 100%,#eef2ff 0%,#d5dffd 45%,#b1c1f4 100%)}
.stage-in{position:relative;max-width:960px;margin:0 auto}
.sat{position:absolute;z-index:2;width:216px;background:#fff;border:1px solid #d3d8df;border-radius:12px;box-shadow:0 0 0 1px rgba(11,13,24,.03),0 1px 2px rgba(11,13,24,.05),0 18px 40px -18px rgba(36,91,194,.4);font-size:12px;line-height:1.45;color:var(--ink2);will-change:transform;display:none}
.sat-h{display:flex;align-items:center;gap:6px;padding:10px 14px;border-bottom:1px solid var(--line2);font-size:12px;font-weight:600;color:var(--ink)}
.sat-h .code{margin-left:auto;font-weight:500}
.sat-h .hash{color:var(--faint);font-weight:500}
.sat-chat{left:-196px;top:-72px}
.msg{display:flex;gap:10px;padding:10px 14px 4px}
.msg:last-child{padding-bottom:14px}
.msg p{margin:2px 0 0;font-weight:400;color:var(--ink2)}
.who{font-weight:600;color:var(--ink);display:flex;align-items:center;gap:6px}
.who span{font-weight:400;color:var(--faint);font-size:11px}
.who .app{font-size:9px;font-weight:600;letter-spacing:.4px;padding:0 4px;border-radius:4px;background:#f1f2f4;color:var(--muted)}
.av{flex:none;width:24px;height:24px;border-radius:6px;display:flex;align-items:center;justify-content:center;font-size:11px;font-weight:600}
.av-m{background:#e7f6ec;color:var(--green)}
.av-r{background:url(/logo-mark.svg) center/120% no-repeat}
.sat-doc{left:-196px;bottom:-112px;background:#fcfbf8;border-color:rgba(60,50,30,.16)}
.sat-doc .sat-h{border-color:rgba(60,50,30,.1);color:#1f1b16}
.docf{margin:0;padding:8px 14px;display:flex;flex-direction:column}
.docf div{display:flex;justify-content:space-between;gap:12px;padding:5px 0;border-bottom:1px dashed rgba(60,50,30,.14)}
.docf div:last-child{border-bottom:0}
.docf dt{color:#7b7266;font-weight:400}
.docf dd{margin:0;color:#1f1b16;font-weight:500}
.docf .hit dd{padding:0 6px;border-radius:5px;background:var(--tag);color:var(--blue);box-shadow:0 0 0 1px rgba(36,91,194,.35)}
.read{display:flex;align-items:center;gap:6px;padding:9px 14px;border-top:1px solid rgba(60,50,30,.1);font-weight:500;color:var(--green)}
.sat-claim{right:-196px;top:88px}
.steps{list-style:none;margin:0;padding:12px 14px;display:flex;flex-direction:column;gap:10px}
.steps li{display:flex;gap:10px;align-items:flex-start;position:relative}
.steps li i{flex:none;width:12px;height:12px;margin-top:2px;border-radius:50%;border:2px solid #cfd5df;background:#fff}
.steps li.ok i{border-color:var(--green);background:var(--green);box-shadow:inset 0 0 0 2px #fff}
.steps li.now i{border-color:var(--blue);border-right-color:transparent;animation:spin 1s linear infinite}
.steps li div{display:flex;flex-direction:column}
.steps li b{font-weight:600;color:var(--ink)}
.steps li span{color:var(--muted);font-weight:400}
.steps li:not(.ok):not(.now) b{color:var(--muted)}
@media (min-width:1360px){.sat{display:block}}
@media (min-width:1520px){.sat{width:260px}.sat-chat,.sat-doc{left:-240px}.sat-claim{right:-240px}}
.window{max-width:960px;margin:0 auto;background:#fff;border:1px solid #d3d8df;border-radius:12px;box-shadow:0 0 0 1px rgba(11,13,24,.03),0 1px 2px rgba(11,13,24,.05),0 24px 60px -24px rgba(36,91,194,.35);overflow:hidden;transform-origin:50% 30%;will-change:transform}
.est{display:flex;flex-wrap:wrap}
.est-in{flex:1 1 360px;min-width:0;padding:28px;display:flex;flex-direction:column;gap:26px}
.est-out{flex:1 1 280px;min-width:0;padding:28px;border-left:1px solid var(--line2);display:flex;flex-direction:column;justify-content:space-between;gap:24px}
.lbl{display:flex;justify-content:space-between;align-items:baseline;gap:12px;font-size:14px}
.lbl label{color:var(--muted)}
input[type=range]{accent-color:var(--blue);width:100%;margin:0;height:28px}
.seg{position:relative;display:grid;grid-template-columns:repeat(5,minmax(0,1fr));padding:3px;background:#f1f2f4;border-radius:10px}
.seg-thumb{position:absolute;top:3px;left:3px;height:32px;width:calc((100% - 6px)/5);border:1px solid #d3d8df;border-radius:8px;background:#fff;box-shadow:0 1px 2px rgba(28,29,31,.08);transition:transform .45s var(--ease)}
.seg button{position:relative;z-index:1;height:32px;border:0;background:transparent;color:var(--muted);font-size:13px;font-weight:500;cursor:pointer;transition:color .3s var(--ease)}
.seg button[aria-pressed=true]{color:var(--ink);font-weight:600}
.big{font-size:44px;font-weight:600;letter-spacing:-1.3px;line-height:1}
.rows{margin:0;display:flex;flex-direction:column;font-size:14px}
.rows div{display:flex;justify-content:space-between;gap:12px;padding:10px 0;border-top:1px solid var(--line2)}
.rows dd{margin:0}
.rails{position:relative;z-index:2;background:var(--bg);max-width:1200px;margin:0 auto;border-left:1px solid var(--line);border-right:1px solid var(--line)}
.sec-head{padding:96px 36px 64px;display:flex;flex-direction:column;gap:18px;border-bottom:1px solid var(--line)}
.sec-head h2{margin:0;font-size:clamp(30px,4vw,40px);line-height:1.1;font-weight:500;letter-spacing:-.4px;max-width:24ch}
.sec-head h2 span{color:var(--soft)}
.full{position:relative;z-index:2;background:var(--bg)}
.chapters{display:grid;grid-template-columns:260px minmax(0,1fr);border-bottom:1px solid var(--line)}
.chap-nav{position:sticky;top:var(--hdr);align-self:start;height:calc(100vh - var(--hdr));padding:40px 0;border-right:1px solid var(--line)}
.chap-nav ol{list-style:none;margin:0;padding:0;position:relative}
.chap-nav button{display:block;width:100%;text-align:left;padding:6px 36px;height:34px;border:0;background:transparent;color:var(--faint);font-size:16px;font-weight:500;cursor:pointer;transition:color .4s var(--ease)}
.chap-nav button:hover{color:var(--ink2)}
.chap-nav button[aria-current=step]{color:var(--ink)}
.chap-ind{position:absolute;left:-1px;top:0;width:2px;height:34px;background:var(--blue);transition:transform .5s var(--ease)}
.chap{border-bottom:1px solid var(--line);scroll-margin-top:var(--hdr)}
.chap:last-child{border-bottom:0}
.chap-text{margin:0;padding:48px 36px;font-size:18px;line-height:1.3;letter-spacing:-.18px;max-width:38ch}
.chap-text span{color:var(--soft)}
.chap-stage{padding:48px 36px 56px;background:var(--panel);border-top:1px solid var(--line);min-height:520px;display:flex;flex-direction:column;gap:16px}
.card{background:#fff;border:1px solid var(--line);border-radius:12px;box-shadow:0 1px 2px rgba(28,29,31,.04);overflow:hidden}
.card-h{display:flex;justify-content:space-between;align-items:center;gap:12px;padding:10px 14px;border-bottom:1px solid var(--line2);font-size:13px}
.card-h b{font-weight:600}
.tbl{width:100%;border-collapse:collapse;font-size:13px}
.tbl th{text-align:left;font-weight:500;color:var(--muted);font-size:12px;padding:8px 14px;border-bottom:1px solid var(--line2);background:var(--bg);white-space:nowrap}
.tbl td{padding:9px 14px;border-bottom:1px solid #f1f2f4;white-space:nowrap;font-variant-numeric:tabular-nums}
.r{text-align:right !important}
.grid2{display:grid;grid-template-columns:repeat(auto-fit,minmax(260px,1fr));gap:16px}
.mini{padding:18px;display:flex;flex-direction:column;gap:12px;min-height:168px}
.mini h4{margin:0;font-size:14px;font-weight:600}
.mini p{margin:0;font-size:13px;line-height:1.45;color:var(--muted);font-weight:400}
.si{opacity:0;transform:translateY(10px);transition:opacity .5s var(--ease),transform .5s var(--ease);transition-delay:calc(var(--i,0) * 90ms)}
.play .si{opacity:1;transform:none}
.flow{position:relative;display:grid;grid-template-columns:repeat(3,minmax(0,1fr));gap:40px;padding:28px}
.node{position:relative;z-index:1;background:#fff;border:1px solid var(--line);border-radius:10px;padding:12px;font-size:13px;display:flex;flex-direction:column;gap:6px;box-shadow:0 1px 2px rgba(28,29,31,.05)}
.node .t{font-size:12px;color:var(--muted)}
.node b{font-weight:600}
.flow svg{position:absolute;inset:0;width:100%;height:100%;z-index:0;overflow:visible}
.wire{fill:none;stroke:#b9c3d6;stroke-width:1.5;stroke-dasharray:4 4}
.wire-on{fill:none;stroke:var(--blue);stroke-width:1.5;stroke-dasharray:240;stroke-dashoffset:240;transition:stroke-dashoffset 1s var(--ease)}
.play .wire-on{stroke-dashoffset:0}
.play .wire-on.w2{transition-delay:.9s}.play .wire-on.w1{transition-delay:.3s}
.matched{position:absolute;right:28px;bottom:-14px;z-index:2}
.bar{height:6px;border-radius:3px;background:#e9ecf1;overflow:hidden}
.bar i{display:block;height:100%;width:0;background:var(--blue);border-radius:3px;transition:width 2.2s var(--ease)}
.roller{height:156px;overflow:hidden;position:relative;-webkit-mask-image:linear-gradient(transparent,#000 22%,#000 78%,transparent);mask-image:linear-gradient(transparent,#000 22%,#000 78%,transparent)}
.roller-track{display:flex;flex-direction:column;gap:8px;animation:roll 18s linear infinite}
.roller-track div{display:flex;justify-content:space-between;gap:8px;font-size:12px;padding:8px 10px;border:1px solid var(--line2);border-radius:8px;background:#fff}
@keyframes roll{to{transform:translateY(-50%)}}
.route{position:relative;height:220px}
.route svg{width:100%;height:100%}
.leg{fill:none;stroke:var(--blue);stroke-width:1.5;stroke-dasharray:300;stroke-dashoffset:300;transition:stroke-dashoffset 1.4s var(--ease)}
.play .leg{stroke-dashoffset:0}
.city{opacity:0;transition:opacity .4s var(--ease)}
.play .city{opacity:1}
.check{display:flex;align-items:center;gap:10px;padding:10px 14px;border-bottom:1px solid #f1f2f4;font-size:13px}
.check .ic{width:16px;height:16px;flex:none;position:relative}
.check .ic svg{position:absolute;inset:0;transition:opacity .3s var(--ease),transform .3s var(--ease)}
.check .spin{animation:spin 1s linear infinite}
.check.done .spin{opacity:0}
.check:not(.done) .ok{opacity:0;transform:scale(.6)}
@keyframes spin{to{transform:rotate(360deg)}}
.filed{opacity:0;transform:translateY(8px);transition:opacity .5s var(--ease),transform .5s var(--ease)}
.filed.show{opacity:1;transform:none}
.radar{position:relative;height:150px;display:flex;align-items:center;justify-content:center}
.ring{position:absolute;border:1px solid #cfd8ea;border-radius:50%}
.ring.a{width:84px;height:84px;animation:ring 3.6s var(--ease) infinite}
.ring.b{width:140px;height:140px;animation:ring 3.6s var(--ease) infinite .6s}
@keyframes ring{0%{transform:scale(.85);opacity:0}30%{opacity:1}100%{transform:scale(1.15);opacity:0}}
.core{width:44px;height:44px;border-radius:12px;background:#fff;border:1px solid var(--line);display:flex;align-items:center;justify-content:center;font-weight:650;font-size:13px;letter-spacing:-.3px;box-shadow:0 1px 2px rgba(28,29,31,.06)}
.bob{position:absolute;font-size:11px;padding:2px 7px;border-radius:7px;background:#fff;border:1px solid var(--line);box-shadow:0 1px 2px rgba(28,29,31,.05);animation:bob 4s ease-in-out infinite}
@keyframes bob{50%{transform:translateY(-5px)}}
.deposit{display:flex;flex-direction:column;gap:14px;padding:20px;background:linear-gradient(#fff,#fbfcfd)}
.split{display:flex;height:10px;border-radius:5px;overflow:hidden;background:#e9ecf1}
.split i{display:block;height:100%;width:0;transition:width 1.6s var(--ease)}
.play .split .c{width:85%;background:var(--blue)}
.play .split .f{width:15%;background:#9fb4e2;transition-delay:.3s}
.rv{opacity:0;transform:translateY(16px);filter:blur(6px);transition:opacity .9s var(--ease),transform .9s var(--ease),filter .9s var(--ease);transition-delay:calc(var(--d,0) * 80ms)}
.rv.in{opacity:1;transform:none;filter:blur(0)}
.stats{margin:0;display:grid;grid-template-columns:repeat(auto-fit,minmax(220px,1fr))}
.stats div{padding:32px 36px;border-right:1px solid var(--line);border-bottom:1px solid var(--line);display:flex;flex-direction:column-reverse;gap:6px}
.stats div:last-child{border-right:0}
.stats dt{font-size:14px;color:var(--muted)}
.stats dd{margin:0;font-size:40px;font-weight:600;letter-spacing:-1.2px;font-variant-numeric:tabular-nums}
.cta{position:relative;z-index:2;padding:112px 24px;display:flex;flex-direction:column;align-items:center;gap:24px;text-align:center;background-color:#e6ecff;background-image:radial-gradient(70% 90% at 50% 0%,#fafafb 30%,rgba(250,250,251,0) 70%),repeating-linear-gradient(90deg,rgba(255,255,255,.5) 0,rgba(255,255,255,.5) 1px,transparent 1px,transparent 8px),radial-gradient(90% 80% at 50% 100%,#eef2ff 0%,#d5dffd 45%,#b1c1f4 100%)}
.cta h2{margin:0;font-size:clamp(36px,5vw,56px);line-height:1;font-weight:600;letter-spacing:-.03em;max-width:16ch}
.cta p{margin:0;font-size:18px;line-height:1.3;color:var(--soft);max-width:40ch}
footer{position:relative;z-index:2;border-top:1px solid var(--line);background:var(--bg)}
.foot{max-width:1200px;margin:0 auto;padding:32px 24px 48px;display:flex;flex-wrap:wrap;justify-content:space-between;gap:12px;font-size:13px;color:var(--muted)}
@media (max-width:900px){
:root{--hdr:0px}
.site-header{position:relative}
.hero{position:relative;top:0;padding:64px 20px 48px}
.stage{padding:56px 16px}
.chapters{grid-template-columns:1fr}
.chap-nav{position:sticky;top:0;z-index:5;height:auto;padding:8px 12px;border-right:0;border-bottom:1px solid var(--line);background:rgba(250,250,251,.95);backdrop-filter:blur(8px);overflow-x:auto}
.chap-nav ol{display:flex;gap:4px}
.chap-nav button{width:auto;white-space:nowrap;padding:6px 10px;height:32px;font-size:14px}
.chap-nav button[aria-current=step]{background:#eef0f3;border-radius:8px}
.chap-ind{display:none}
.flow{grid-template-columns:1fr;gap:16px}
.flow svg{display:none}
.sec-head,.chap-text,.chap-stage{padding-left:20px;padding-right:20px}
}
@media (prefers-reduced-motion:reduce){
html{scroll-behavior:auto}
.enter,.rv,.si,.filed{animation:none !important;opacity:1 !important;filter:none !important;transform:none !important;transition:none !important}
.roller-track,.ring,.bob,.check .spin{animation:none !important}
.wire-on,.leg{stroke-dashoffset:0 !important;transition:none !important}
.bar i,.split i{transition:none !important}
.steps li.now i{animation:none !important}
.hero,.window,.sat{animation:none !important;transform:none !important;opacity:1 !important;filter:none !important}
}