:root{--ink:#183153;--muted:#52657d;--brand:#2563eb;--brand-dark:#1d4ed8;--surface:#eff5ff;--line:#dbe5f2;--font:'Avenir Next','PingFang SC','Microsoft YaHei',sans-serif}
*{box-sizing:border-box}html{scroll-behavior:smooth;scroll-padding-top:110px}body{margin:0;background:#fff;color:var(--ink);font:16px/1.8 var(--font)}a{color:inherit;text-decoration:none}button,input,textarea{font:inherit}button,a,input,textarea,summary{-webkit-tap-highlight-color:transparent}:focus-visible{outline:3px solid var(--brand);outline-offset:4px}a:hover{color:var(--brand)}h1,h2,h3,p{margin:0}h1,h2,h3{line-height:1.3;font-weight:650}h1{font-size:clamp(36px,4.2vw,56px);letter-spacing:-1.8px}h2{font-size:36px;letter-spacing:-.8px}h3{font-size:21px}p{color:var(--muted)}.container{width:min(1200px,calc(100% - 64px));margin:auto}.skip-link{position:fixed;left:16px;top:-90px;z-index:2000;padding:12px 20px;background:#fff;border:2px solid var(--brand)}.skip-link:focus{top:12px}
.site-header{position:fixed;inset:0 0 auto;z-index:1000;background:rgba(255,255,255,.97);border-bottom:1px solid var(--line)}.site-header-inner{width:min(1200px,calc(100% - 64px));margin:auto;min-height:76px;display:flex;align-items:center;justify-content:space-between;gap:24px}.brand{display:flex;align-items:center;gap:10px;flex-shrink:0}.brand img{width:36px;height:36px;object-fit:cover;border-radius:8px}.brand-text strong{font-size:16px;line-height:1.3;display:block}.brand-text small{margin-left:4px;display:block;font-size:10px;color:var(--muted);letter-spacing:7px}.site-nav{display:flex;align-items:center;gap:26px;list-style:none;padding:0;margin:0}.site-nav a{font-size:14px;display:inline-flex;align-items:center;min-height:44px}.site-nav a.active{text-decoration:underline;text-underline-offset:8px;color:var(--brand)}.header-actions{display:flex;align-items:center;gap:16px;flex-shrink:0}.header-actions>a:not(.btn){font-size:14px;min-height:44px;display:inline-flex;align-items:center}.btn{display:inline-flex;align-items:center;justify-content:center;gap:8px;min-height:46px;padding:10px 22px;border:1px solid var(--line);border-radius:6px;background:white;color:var(--ink);font-size:14px;font-weight:600;cursor:pointer;line-height:1.5;transition:background .15s,color .15s}.btn:hover{background:var(--surface);color:var(--brand)}.btn-primary{background:var(--brand);border-color:var(--brand);color:white}.btn-primary:hover{background:var(--brand-dark);color:white}.btn:disabled{opacity:.6;cursor:wait}.header-actions .btn{min-height:42px;padding:9px 18px}.actions{display:flex;gap:12px;flex-wrap:wrap}
.home-hero{padding:160px 0 80px;position:relative;background:linear-gradient(90deg,#fff 0%,#fff 56%,var(--surface) 56%)}.home-hero-grid{display:grid;grid-template-columns:1.05fr 1fr;gap:70px;align-items:center}.audience{display:inline-flex;align-items:center;gap:9px;font-size:14px;color:var(--brand);margin-bottom:24px}.audience:before{content:'';height:7px;width:7px;border-radius:50%;background:var(--brand)}.home-hero h1{margin-bottom:24px}.home-hero-copy>p{max-width:490px;margin-bottom:32px;font-size:17px}.home-hero-note{font-size:13px;margin-top:18px;color:var(--muted)}.ledger{background:white;border:1px solid var(--line);border-radius:10px;box-shadow:0 18px 48px #18315312;overflow:hidden}.ledger-header{display:flex;justify-content:space-between;align-items:center;padding:18px 24px;border-bottom:1px solid var(--line);font-size:14px;gap:12px}.demo-label{font-size:12px;color:var(--muted);white-space:nowrap}.ledger-order{padding:24px;background:#f8faff;border-bottom:1px solid var(--line)}.ledger-order small{color:var(--muted);font-size:12px}.ledger-order h3{font-size:23px;margin:8px 0 12px}.ledger-meta{display:flex;align-items:center;justify-content:space-between;gap:8px;font-size:13px}.status{display:inline-flex;align-items:center;gap:6px;color:#226549;background:#eaf5ef;padding:3px 9px;border-radius:4px;font-size:12px}.ledger-chain{padding:8px 24px}.chain-row{display:grid;grid-template-columns:28px 1fr auto;gap:14px;align-items:center;position:relative;padding:17px 0}.chain-row:not(:last-child){border-bottom:1px solid #e9eef7}.chain-icon{display:flex;align-items:center;justify-content:center;width:28px;height:28px;background:var(--surface);color:var(--brand);border-radius:50%;font-size:13px}.chain-row strong{font-size:14px;display:block}.chain-row p{font-size:12px}.chain-row>span:last-child{font-size:12px;color:var(--muted)}.ledger-foot{padding:12px 24px;border-top:1px solid var(--line);font-size:12px;color:var(--muted)}.scope-strip{border-bottom:1px solid var(--line);padding:23px 0}.scope-inner{display:flex;justify-content:space-between;align-items:center;gap:24px;font-size:14px}.scope-inner p{font-size:13px}.scope-items{display:flex;gap:26px;color:var(--ink);flex-wrap:wrap}.scope-items span{display:flex;align-items:center;gap:8px}.scope-items span:before{content:'';width:5px;height:5px;background:var(--brand);border-radius:50%}
.section{padding:88px 0}.section-intro{display:flex;align-items:end;justify-content:space-between;gap:40px;margin-bottom:40px}.section-intro p{max-width:470px}.text-link{font-size:14px;color:var(--brand);border-bottom:1px solid #a8bfee;padding-bottom:3px;display:inline-block}.feature-grid{display:grid;grid-template-columns:repeat(3,1fr);gap:0 40px}.feature{padding:28px 0;border-top:1px solid var(--line)}.feature h3{margin-bottom:12px}.feature p{font-size:14px;min-height:76px;margin-bottom:18px}.capabilities{display:flex;gap:8px;flex-wrap:wrap;margin-bottom:20px}.capabilities span{font-size:12px;background:var(--surface);padding:3px 9px;color:var(--muted);border-radius:3px}
.flow-section{background:var(--surface)}.flow-layout{display:grid;grid-template-columns:300px 1fr;gap:64px;margin-top:40px}.scenario-list{display:flex;flex-direction:column;gap:12px}.scenario-button{text-align:left;display:block;border:1px solid var(--line);border-radius:6px;padding:18px 20px;background:white;color:var(--ink);cursor:pointer;min-height:76px}.scenario-button strong{display:block;font-size:16px}.scenario-button span{display:block;font-size:12px;margin-top:4px;color:var(--muted)}.scenario-button[aria-pressed=true]{background:var(--brand);border-color:var(--brand);color:white}.scenario-button[aria-pressed=true] span{color:#e7efff}.flow-content{min-width:0}.flow-content h3{font-size:25px;margin-bottom:12px}.flow-content>p{font-size:14px}.process{display:grid;grid-template-columns:repeat(4,1fr);list-style:none;padding:0;margin:30px 0;border-top:2px solid #b5caf3}.process li{padding:22px 16px 0 0;position:relative}.process li:before{content:'';width:10px;height:10px;border:2px solid var(--brand);background:var(--surface);border-radius:50%;position:absolute;top:-7px;left:0}.process strong{font-size:15px;display:block;margin-bottom:6px}.process p{font-size:13px}.flow-boundary{padding:16px 20px;background:white;border-left:3px solid var(--brand);font-size:13px}.flow-content>.text-link{margin-top:20px}
.quality-layout{display:grid;grid-template-columns:1fr 1fr;gap:100px;align-items:start}.quality-copy h2{margin-bottom:24px}.quality-copy>p{margin-bottom:28px}.quality-list{list-style:none;margin:0;padding:0}.quality-list li{padding:20px 0;border-top:1px solid var(--line)}.quality-list h3{font-size:18px;margin-bottom:8px}.quality-list p{font-size:14px}.quality-note{font-size:12px!important;margin-top:20px}.getting-started{border-top:1px solid var(--line)}.start-grid{display:grid;grid-template-columns:repeat(3,1fr);gap:48px;margin-top:36px}.start-step{border-left:2px solid var(--line);padding-left:24px}.start-step span{color:var(--brand);font-size:14px}.start-step h3{margin:10px 0}.start-step p{font-size:14px}.faq-layout{display:grid;grid-template-columns:1fr 1.4fr;gap:80px}.faq-heading p{margin-top:16px}.faq-list details{border-top:1px solid var(--line);padding:18px 0}.faq-list details:last-child{border-bottom:1px solid var(--line)}.faq-list summary{display:flex;justify-content:space-between;align-items:center;gap:16px;cursor:pointer;list-style:none;min-height:44px;font-weight:600}.faq-list summary::-webkit-details-marker{display:none}.faq-list summary:after{content:'+';font-size:24px;color:var(--brand)}.faq-list details[open] summary:after{content:'−'}.faq-list details p{font-size:14px;padding:10px 36px 6px 0}.cta{background:var(--ink);padding:64px 0;color:white}.cta-inner{display:flex;justify-content:space-between;align-items:center;gap:48px}.cta h2{font-size:32px}.cta p{color:#cedcf2;margin-top:14px;font-size:14px}.cta .btn-primary{background:white;color:var(--ink);border-color:white}.cta .btn-secondary{background:transparent;border-color:#7892b5;color:white}.cta .btn:hover{background:#e4edff;color:var(--ink)}.site-footer{padding:48px 0 24px;background:white;border-top:1px solid var(--line)}.footer-main{display:flex;justify-content:space-between;align-items:start;gap:48px}.footer-main p{font-size:13px;max-width:350px;margin-top:14px}.footer-links{display:flex;gap:56px}.footer-links strong{font-size:14px;display:block;margin-bottom:12px}.footer-links a{font-size:13px;display:block;min-height:32px;color:var(--muted)}.footer-bottom{border-top:1px solid var(--line);padding-top:20px;margin-top:32px;display:flex;justify-content:space-between;gap:16px;font-size:12px;color:var(--muted)}
.page-shell{padding:140px 0 80px;background:#f8faff;min-height:70vh}.breadcrumb{font-size:13px;color:var(--muted);margin-bottom:32px}.site-contact-layout{display:grid;grid-template-columns:.85fr 1.15fr;gap:80px;align-items:start}.contact-copy h1{font-size:38px;margin:16px 0 24px;letter-spacing:-1px}.contact-copy>p{font-size:15px}.contact-points{padding:0;list-style:none;margin-top:32px}.contact-points li{padding:20px 0;border-top:1px solid var(--line)}.contact-points strong{display:block;font-size:15px;margin-bottom:8px}.contact-points p{font-size:14px}.contact-form{padding:32px;background:white;border:1px solid var(--line);border-radius:10px;display:grid;gap:24px}.contact-form h2{font-size:22px}.site-grid-2{display:grid;grid-template-columns:1fr 1fr;gap:20px}.site-contact-field{display:block;min-width:0}.field-label{display:block;font-size:14px;font-weight:600;margin-bottom:8px}.field-label small{font-size:12px;color:var(--muted);font-weight:400;margin-left:6px}.site-contact-field input,.site-contact-field textarea{display:block;width:100%;min-height:48px;padding:11px 12px;border:1px solid #b9cce5;border-radius:6px;color:var(--ink);background:white;font-size:16px;line-height:1.6}.site-contact-field textarea{resize:vertical}.site-contact-field input::placeholder,.site-contact-field textarea::placeholder{color:#647a97;font-size:14px}.form-note{font-size:12px}.contact-status{font-size:14px;color:var(--ink)}.contact-status[data-state=error]{color:#9b3227}.contact-status[data-state=success]{color:#226549}
@media(max-width:1050px){.site-nav{gap:16px}.home-hero-grid{gap:32px}.home-hero{padding-top:145px}.flow-layout{gap:36px;grid-template-columns:260px 1fr}.quality-layout{gap:48px}.feature-grid{grid-template-columns:repeat(2,1fr)}.site-contact-layout{gap:40px}.brand-text small{display:none}}
@media(max-width:800px){html{scroll-padding-top:145px}.container,.site-header-inner{width:calc(100% - 40px)}.site-header-inner{flex-wrap:wrap;gap:0 16px;padding:12px 0}.site-nav{order:3;overflow-x:auto;width:100%;gap:24px;margin-top:8px;white-space:nowrap}.site-nav a{min-height:36px}.header-actions{margin-left:auto;gap:12px}.header-actions .btn{padding:9px 12px}.home-hero{padding:170px 0 48px;background:linear-gradient(180deg,#fff 0%,#fff 52%,var(--surface) 52%)}.home-hero-grid{grid-template-columns:1fr;gap:36px}.home-hero-copy>p{max-width:600px}.ledger{max-width:600px;width:100%}.scope-inner{align-items:start;flex-direction:column;gap:14px}.scope-items{gap:10px 24px}.section{padding:56px 0}.section-intro{display:block}.section-intro h2{margin-bottom:16px}h2{font-size:28px}.flow-layout{grid-template-columns:1fr;gap:28px}.scenario-list{flex-direction:row;gap:8px}.scenario-button{flex:1;padding:14px 10px;min-width:0}.scenario-button strong{font-size:14px}.scenario-button span{font-size:11px}.quality-layout,.faq-layout,.site-contact-layout{grid-template-columns:1fr;gap:32px}.start-grid{gap:24px}.cta-inner{align-items:start;flex-direction:column;gap:28px}.cta h2{font-size:28px}.footer-main{gap:32px;flex-direction:column}.footer-links{gap:64px}.page-shell{padding:165px 0 56px}.contact-copy h1{font-size:34px}.feature p{min-height:0}}
@media(max-width:480px){.brand-text strong{font-size:16px}.brand img{height:30px;width:30px}.header-actions{gap:8px}.header-actions .btn{font-size:12px;padding:9px 10px}.header-actions>a:not(.btn){font-size:13px}.home-hero h1{font-size:36px;letter-spacing:-1px}.home-hero-copy>p{font-size:16px}.feature-grid{grid-template-columns:1fr}.feature{padding:24px 0}.feature p{margin-bottom:16px}.section-intro{margin-bottom:28px}.process{grid-template-columns:1fr 1fr;gap:18px 8px;border-top:0;margin:24px 0}.process li{padding:12px 8px 0 16px;border-left:2px solid #b5caf3}.process li:before{top:16px;left:-6px}.start-grid{grid-template-columns:1fr;gap:24px}.site-grid-2{grid-template-columns:1fr;gap:24px}.contact-form{padding:24px 20px}.ledger-header,.ledger-order{padding:18px}.ledger-chain{padding:4px 18px}.chain-row{gap:10px}.chain-row>span:last-child{font-size:11px}.ledger-meta{font-size:12px}.footer-bottom{flex-direction:column;gap:8px}}
@media(prefers-reduced-motion:reduce){html{scroll-behavior:auto}*,*:before,*:after{transition:none!important;animation:none!important}}