@font-face{font-family:Geist;src:url('/assets/fonts/geist-sans.woff2') format('woff2');font-display:swap;font-weight:100 900}
@font-face{font-family:Geist Mono;src:url('/assets/fonts/geist-mono.woff2') format('woff2');font-display:swap;font-weight:100 900}
:root{--canvas:#0b0f14;--deep:#070a0e;--surface:#101720;--surface-2:#151f2a;--surface-3:#1c2936;--border:#263442;--border-strong:#3b5064;--text:#f3f6f8;--secondary:#bac6d0;--muted:#8997a5;--blue:#68cdfa;--green:#38d7a3;--red:#f1717f;--amber:#f5bf58;--sans:Geist,system-ui,sans-serif;--mono:'Geist Mono',ui-monospace,monospace;--shadow:0 28px 80px rgba(0,0,0,.34)}
*{box-sizing:border-box}
html{scroll-behavior:smooth;background:var(--canvas)}
body{margin:0;background:radial-gradient(circle at 75% 0,rgba(50,136,179,.08),transparent 28%),var(--canvas);color:var(--text);font-family:var(--sans);-webkit-font-smoothing:antialiased}
body::before{content:"";position:fixed;z-index:-1;inset:0;background-image:linear-gradient(rgba(104,205,250,.018) 1px,transparent 1px),linear-gradient(90deg,rgba(104,205,250,.018) 1px,transparent 1px);background-size:40px 40px;mask-image:linear-gradient(#000,transparent 68%)}
a{color:inherit}button,select{font:inherit;color:inherit}.nowrap{white-space:nowrap}.shell{width:min(1180px,calc(100% - 48px));margin-inline:auto}.skip-link{position:fixed;z-index:100;left:16px;top:-60px;padding:10px 14px;background:var(--blue);color:#061018;border-radius:6px;text-decoration:none}.skip-link:focus{top:12px}
:focus-visible{outline:2px solid var(--blue);outline-offset:3px}
.site-header{position:sticky;z-index:30;top:0;border-bottom:1px solid rgba(59,80,100,.55);background:rgba(8,12,17,.88);backdrop-filter:blur(18px)}
.nav-shell{width:min(1240px,calc(100% - 40px));height:68px;margin:auto;display:flex;align-items:center;gap:32px}.brand{display:inline-flex;align-items:center;gap:10px;font-size:16px;font-weight:680;letter-spacing:-.02em;text-decoration:none}.brand img{width:32px;height:32px}.desktop-nav{display:flex;align-items:center;gap:28px;margin-left:26px}.desktop-nav a,.language-link{color:var(--secondary);font-size:13px;text-decoration:none}.desktop-nav a:hover,.language-link:hover{color:var(--text)}.nav-actions{display:flex;align-items:center;gap:12px;margin-left:auto}.language-link{padding:8px 9px;border:1px solid var(--border);border-radius:7px;font:650 10px var(--mono)}
.button{display:inline-flex;align-items:center;justify-content:center;min-height:43px;padding:0 18px;border:1px solid var(--border-strong);border-radius:8px;background:rgba(17,24,33,.78);color:var(--text);font-size:13px;font-weight:680;text-decoration:none;transition:transform .18s ease,border-color .18s ease,background .18s ease}.button:hover{transform:translateY(-1px);border-color:#5c7690;background:var(--surface-2)}.button-primary{border-color:#8bddff;background:var(--blue);color:#071019;box-shadow:0 12px 30px rgba(104,205,250,.12)}.button-primary:hover{background:#8edcff}.nav-cta{min-height:38px;padding-inline:15px}.menu-button{display:none;min-height:38px;padding:0 12px;border:1px solid var(--border);border-radius:8px;background:var(--surface);cursor:pointer}.mobile-menu{display:grid;padding:10px 22px 18px;border-top:1px solid var(--border);background:#0e151e;box-shadow:var(--shadow)}.mobile-menu[hidden]{display:none}.mobile-menu a{padding:13px 5px;border-bottom:1px solid var(--border);color:var(--secondary);text-decoration:none}
.eyebrow{margin:0 0 17px;color:var(--blue);font:650 10px var(--mono);letter-spacing:.1em;text-transform:uppercase}.hero{padding:88px 0 72px;border-bottom:1px solid rgba(38,52,66,.7)}.hero-grid{display:grid;grid-template-columns:1.02fr .98fr;gap:72px;align-items:center}.hero h1,.page-hero h1,.not-found h1{margin:0;max-width:820px;font-size:clamp(52px,5.8vw,78px);line-height:1.015;letter-spacing:-.058em;text-wrap:balance}.hero-copy{max-width:700px;margin:25px 0 30px;color:var(--secondary);font-size:18px;line-height:1.65}.button-row{display:flex;align-items:center;gap:12px;flex-wrap:wrap}.button-row.center{justify-content:center;margin-top:42px}.boundary-row{display:flex;gap:9px;flex-wrap:wrap;margin-top:24px;color:var(--muted);font:560 10px var(--mono);letter-spacing:.04em;text-transform:uppercase}.boundary-row span+span::before{content:"·";margin-right:9px;color:var(--border-strong)}
.evidence-panel{overflow:hidden;border:1px solid var(--border-strong);border-radius:15px;background:linear-gradient(150deg,#131c26,#0b1118);box-shadow:var(--shadow)}.evidence-head,.evidence-foot{display:flex;align-items:center;justify-content:space-between;gap:15px;padding:16px 18px;color:var(--muted);font:600 9px var(--mono);letter-spacing:.07em}.evidence-head{border-bottom:1px solid var(--border)}.evidence-head b{color:var(--amber)}.evidence-row{display:grid;grid-template-columns:36px .82fr 1.18fr;gap:12px;align-items:center;min-height:78px;padding:14px 18px;border-bottom:1px solid var(--border)}.evidence-row small{color:var(--blue);font:600 10px var(--mono)}.evidence-row strong{font-size:14px}.evidence-row span{color:var(--secondary);font-size:12px;line-height:1.45}.evidence-foot{justify-content:flex-start;background:#0d141c}.state-dot{width:7px;height:7px;border-radius:50%;background:var(--green);box-shadow:0 0 12px rgba(56,215,163,.4)}
.proof-strip{border-bottom:1px solid var(--border);background:#0d141c}.proof-inner{min-height:68px;display:flex;align-items:center;justify-content:space-between;gap:24px;color:var(--secondary);font:540 11px var(--mono)}.proof-inner b{color:var(--amber);letter-spacing:.06em}.section{padding:96px 0;border-bottom:1px solid rgba(38,52,66,.65)}.section-tint{background:rgba(14,21,29,.76)}.section-head{max-width:810px;margin-bottom:44px}.section-head h2,.final-cta h2,.boundary-split h2,.pricing-callout h2{margin:0;font-size:clamp(35px,4vw,54px);line-height:1.08;letter-spacing:-.045em;text-wrap:balance}.section-head>p:last-child,.pricing-callout p,.final-cta p{margin:19px 0 0;color:var(--secondary);font-size:17px;line-height:1.7}
.question-grid{display:grid;grid-template-columns:repeat(3,1fr);gap:12px}.question-grid article,.case-grid article,.principle-grid article,.support-grid article{padding:28px;border:1px solid var(--border);background:linear-gradient(145deg,var(--surface),#0d141c)}.question-grid small,.principle-grid small,.replay-notes small{color:var(--blue);font:650 10px var(--mono)}.question-grid h3{margin:42px 0 10px;font-size:21px}.question-grid p,.case-grid p,.principle-grid p,.support-grid p{margin:0;color:var(--secondary);line-height:1.65}
.split-proof{display:grid;grid-template-columns:1.05fr .95fr;gap:72px;align-items:center}.proof-checklist{border-top:1px solid var(--border-strong)}.proof-checklist div{display:grid;grid-template-columns:42px 1fr;gap:16px;padding:20px 0;border-bottom:1px solid var(--border)}.proof-checklist span{color:var(--blue);font:650 10px var(--mono)}.proof-checklist b{font-size:14px}.layer-grid{display:grid;grid-template-columns:repeat(4,1fr);gap:10px}.layer-grid article{display:flex;min-height:260px;flex-direction:column;padding:25px;border:1px solid var(--border);background:var(--surface)}.layer-grid small{color:var(--blue);font:650 9px var(--mono)}.layer-grid h3{margin:52px 0 12px;font-size:22px}.layer-grid p{margin:0;color:var(--secondary);font-size:13px;line-height:1.62}.layer-grid span{margin-top:auto;color:var(--blue)}
.quality-section{display:grid;grid-template-columns:1fr 1fr;gap:70px;align-items:center}.quality-states{display:grid;grid-template-columns:1fr 1fr;gap:8px}.quality-states span{padding:17px;border:1px solid var(--border);color:var(--secondary);font:650 10px var(--mono)}.quality-states .ok{color:var(--green)}.quality-states .warn{color:var(--amber)}.quality-states .dim{color:var(--muted)}
.boundary-split{display:grid;grid-template-columns:1fr 1fr;gap:0;border:1px solid var(--border)}.boundary-split>div{padding:42px}.boundary-split>div+div{border-left:1px solid var(--border);background:rgba(241,113,127,.025)}.boundary-split h2{font-size:38px}.boundary-split ul,.number-list{margin:26px 0 0;padding-left:20px;color:var(--secondary);line-height:1.9}.check-list,.cross-list{padding:0!important;list-style:none}.check-list li,.cross-list li{padding:8px 0}.check-list li::before{content:"✓";margin-right:10px;color:var(--green)}.cross-list li::before{content:"×";margin-right:10px;color:var(--red)}.pricing-callout{display:flex;align-items:center;justify-content:space-between;gap:50px;padding:45px;border:1px solid var(--border-strong);background:linear-gradient(135deg,#151f2a,#0d141c)}.pricing-callout h2{max-width:760px;font-size:40px}.pricing-callout p{max-width:800px;font-size:15px}.final-cta{padding:102px 0 112px;text-align:center}.final-cta h2{max-width:820px;margin-inline:auto}.final-cta p{max-width:680px;margin:20px auto 28px}.final-cta .button-row{justify-content:center}
.page-hero{padding:92px 0 76px;border-bottom:1px solid var(--border)}.page-hero-inner{display:grid;min-height:320px;align-items:center}.page-hero h1{max-width:980px;font-size:clamp(48px,6vw,72px)}.version-row{display:flex;gap:9px;flex-wrap:wrap;margin-top:25px}.version-row span{padding:7px 10px;border:1px solid var(--border);color:var(--muted);font:600 10px var(--mono)}
.product-intro{display:grid;grid-template-columns:1fr .9fr;gap:72px;align-items:start}.number-list{counter-reset:item;list-style:none;padding:0}.number-list li{display:grid;grid-template-columns:34px 1fr;gap:12px;padding:15px 0;border-bottom:1px solid var(--border)}.number-list li::before{counter-increment:item;content:"0" counter(item);color:var(--blue);font:650 9px var(--mono)}.case-grid{display:grid;grid-template-columns:1fr 1fr;gap:12px}.case-grid article{min-height:270px}.case-grid article>span{color:var(--amber);font:600 9px var(--mono);letter-spacing:.04em}.case-grid h3{margin:58px 0 14px;font-size:25px}.case-grid p{font-size:14px}
.replay-section{padding-top:60px}.replay-disclosure{display:flex;justify-content:space-between;gap:30px;padding:18px 20px;border:1px solid var(--border);background:rgba(245,191,88,.035);color:var(--secondary);font:540 11px var(--mono)}.replay-disclosure b{color:var(--amber)}.replay-live{margin-top:16px;overflow:hidden;border:1px solid var(--border-strong);border-radius:14px;background:#0d141c;box-shadow:var(--shadow)}.replay-toolbar{display:flex;align-items:center;justify-content:space-between;gap:24px;padding:20px;border-bottom:1px solid var(--border)}.replay-toolbar span{display:block;color:var(--muted);font:600 9px var(--mono)}.replay-toolbar strong{display:block;margin-top:7px}.replay-status{padding:14px 20px;border-bottom:1px solid var(--border);color:var(--amber);font:600 10px var(--mono)}.replay-status.verified{color:var(--green)}.replay-status.unavailable{color:var(--red)}.replay-metrics{display:grid;grid-template-columns:repeat(3,1fr);padding:8px}.replay-metrics>div{min-height:104px;padding:20px;border:1px solid var(--border);margin:-1px 0 0 -1px}.replay-metrics span{display:block;color:var(--muted);font:600 9px var(--mono)}.replay-metrics strong{display:block;margin-top:15px;font:650 17px var(--mono);overflow-wrap:anywhere}.replay-metrics strong.ok{color:var(--green)}.replay-metrics strong.warn{color:var(--amber)}.replay-source{padding:15px 20px 20px}.replay-source>div{display:grid;grid-template-columns:180px 1fr;gap:20px;padding:11px 0;border-bottom:1px solid var(--border)}.replay-source span{color:var(--muted);font-size:11px}.replay-source code{color:var(--secondary);font:500 10px var(--mono);overflow-wrap:anywhere}.replay-notes{display:grid;grid-template-columns:repeat(3,1fr);gap:12px;margin-top:42px}.replay-notes article{padding:26px;border-top:1px solid var(--border-strong)}.replay-notes h3{margin:28px 0 10px}.replay-notes p,.notice{color:var(--secondary);line-height:1.65}.notice{padding:20px;border:1px solid var(--border)}
.price-layout{display:grid;grid-template-columns:.92fr 1.08fr;gap:46px;align-items:start}.price-panel{padding:38px;border:1px solid var(--border-strong);background:linear-gradient(145deg,var(--surface-2),#0d141c)}.price-panel h2{font-size:30px}.price{margin:20px 0;font:650 49px var(--mono);letter-spacing:-.06em}.price small{color:var(--secondary);font:500 14px var(--sans);letter-spacing:0}.muted-copy{color:var(--secondary);line-height:1.65}.price-panel .button{width:100%;margin-top:22px}.payment-note{padding:25px;border-left:2px solid var(--amber);background:rgba(245,191,88,.035)}.payment-note p{color:var(--secondary);line-height:1.65}.faq-list{margin-top:26px;border-top:1px solid var(--border-strong)}.faq-list details{border-bottom:1px solid var(--border)}.faq-list summary{padding:21px 2px;cursor:pointer;list-style:none}.faq-list summary::after{content:"+";float:right;color:var(--blue);font:500 18px var(--mono)}.faq-list details[open] summary::after{content:"−"}.faq-list p{max-width:820px;margin:-4px 0 22px;color:var(--secondary);line-height:1.65}
.method-shell{display:grid;grid-template-columns:270px 1fr;gap:64px;padding-block:64px 110px}.method-nav{position:sticky;top:96px;align-self:start}.method-nav label{display:block;margin-bottom:9px;color:var(--muted);font:600 9px var(--mono);text-transform:uppercase}.method-nav select{display:none;width:100%;padding:12px;border:1px solid var(--border);background:var(--surface)}.method-links a{display:grid;grid-template-columns:30px 1fr;gap:8px;padding:11px 0;border-bottom:1px solid var(--border);color:var(--secondary);font-size:12px;text-decoration:none}.method-links small{color:var(--muted);font:600 9px var(--mono)}.method-links a:hover,.method-links a[aria-current]{color:var(--blue)}.method-article{margin-bottom:88px;scroll-margin-top:100px}.method-title{display:grid;grid-template-columns:40px 1fr auto;gap:14px;align-items:start}.method-title>span{padding-top:9px;color:var(--blue);font:650 10px var(--mono)}.method-title h2{margin:0;font-size:42px;letter-spacing:-.04em}.method-title button{border:0;background:transparent;color:var(--muted);cursor:pointer}.method-lead{color:var(--secondary);font-size:17px;line-height:1.72}.method-block{margin-top:26px;padding:27px;border:1px solid var(--border);background:var(--surface)}.method-block h3{margin:0 0 13px}.method-block p{color:var(--secondary);line-height:1.65}.formula{overflow:auto;padding:15px;border:1px solid var(--border);background:#090e13;color:var(--blue);font:500 12px var(--mono)}.method-facts{display:grid;grid-template-columns:1fr 1fr;margin-top:10px;border:1px solid var(--border)}.method-facts div{padding:16px}.method-facts div+div{border-left:1px solid var(--border)}.method-facts dt{color:var(--muted);font:600 9px var(--mono)}.method-facts dd{margin:8px 0 0;color:var(--secondary);font-size:12px}
.research-grid{display:grid;grid-template-columns:repeat(3,1fr);gap:12px}.research-card{display:flex;min-height:330px;flex-direction:column;padding:28px;border:1px solid var(--border);background:var(--surface);text-decoration:none}.research-card:hover{border-color:var(--border-strong);background:var(--surface-2)}.research-card small{color:var(--blue);font:600 9px var(--mono)}.research-card h2{margin:54px 0 16px;font-size:25px;letter-spacing:-.03em}.research-card p{color:var(--secondary);line-height:1.65}.research-card span{margin-top:auto;color:var(--blue);font-size:12px}.article-page,.legal-page{max-width:860px;padding-block:90px 120px}.article-page h1,.legal-page h1{margin:0;font-size:clamp(46px,6vw,72px);line-height:1.04;letter-spacing:-.055em;text-wrap:balance}.article-deck{font-size:20px;line-height:1.65;color:var(--secondary)}.article-meta,.legal-meta{display:flex;gap:9px;flex-wrap:wrap;margin:26px 0 64px}.article-meta span,.legal-meta span{padding:7px 10px;border:1px solid var(--border);color:var(--muted);font:600 9px var(--mono)}.article-page section,.legal-page section{margin-top:58px}.article-page h2,.legal-page h2{font-size:30px}.article-page section p,.legal-page section p{color:var(--secondary);font-size:17px;line-height:1.8}.article-callout,.legal-notice{margin-top:70px;padding:27px;border:1px solid var(--border-strong);background:var(--surface)}.article-callout p,.legal-notice{color:var(--secondary);line-height:1.65}.article-callout .button{margin-top:12px}.legal-notice{margin-top:-30px;border-left:2px solid var(--amber)}
.principle-grid,.support-grid{display:grid;grid-template-columns:repeat(3,1fr);gap:12px}.principle-grid article,.support-grid article{min-height:290px}.principle-grid h2,.support-grid h2{margin:42px 0 14px;font-size:25px}.support-grid a{display:inline-block;margin-bottom:20px;color:var(--blue);overflow-wrap:anywhere}.content-narrow,.support-note{max-width:820px}.content-narrow h2,.support-note h2{font-size:38px}.content-narrow p,.support-note p{color:var(--secondary);font-size:17px;line-height:1.75}.support-note{margin-top:48px;padding:28px;border-left:2px solid var(--blue);background:var(--surface)}.changelog-list{max-width:900px}.changelog-list article{display:grid;grid-template-columns:140px 1fr;gap:30px;padding:34px 0;border-top:1px solid var(--border)}.changelog-list time{color:var(--muted);font:600 10px var(--mono)}.changelog-list span{color:var(--blue);font:600 9px var(--mono)}.changelog-list h2{margin:10px 0;font-size:27px}.changelog-list p{color:var(--secondary);line-height:1.65}.not-found{min-height:70vh;padding-block:110px}.not-found p:not(.eyebrow){color:var(--secondary);font-size:18px}.not-found .button-row{margin-top:30px}
.site-footer{padding:58px 0 30px;border-top:1px solid var(--border);background:var(--deep)}.footer-grid{display:grid;grid-template-columns:1.5fr repeat(5,1fr);gap:28px}.footer-brand p{max-width:250px;color:var(--muted);font-size:12px;line-height:1.65}.footer-grid h2{margin:0 0 16px;color:var(--secondary);font:600 9px var(--mono);letter-spacing:.1em;text-transform:uppercase}.footer-grid>div>a:not(.brand){display:block;margin:11px 0;color:var(--muted);font-size:12px;text-decoration:none}.footer-grid>div>a:hover{color:var(--text)}.footer-note{margin-top:42px;padding-top:22px;border-top:1px solid var(--border);color:var(--muted);font-size:11px;line-height:1.65}
@media(max-width:1040px){.desktop-nav{display:none}.menu-button{display:block}.hero-grid,.split-proof,.quality-section,.product-intro{grid-template-columns:1fr}.hero-grid{gap:48px}.evidence-panel{max-width:780px}.layer-grid{grid-template-columns:1fr 1fr}.footer-grid{grid-template-columns:1.3fr repeat(3,1fr)}.method-shell{grid-template-columns:230px 1fr}}
@media(max-width:720px){.shell{width:calc(100% - 34px)}.nav-shell{width:calc(100% - 28px);height:62px;gap:10px}.brand span{font-size:15px}.language-link{display:none}.nav-cta{min-height:36px;padding-inline:11px;font-size:11px}.menu-button{font-size:11px}.hero{padding:62px 0 48px}.hero h1,.page-hero h1,.not-found h1{font-size:clamp(39px,11vw,48px);line-height:1.06;letter-spacing:-.045em;word-break:normal;overflow-wrap:normal}.hero h1 br,.page-hero h1 br{display:none}.hero-copy{font-size:16px}.button-row .button{width:100%}.evidence-row{grid-template-columns:30px 1fr}.evidence-row span{grid-column:2}.proof-inner{min-height:92px;align-items:flex-start;justify-content:center;flex-direction:column;gap:8px}.section{padding:72px 0}.section-head{margin-bottom:34px}.section-head h2,.final-cta h2,.boundary-split h2,.pricing-callout h2{font-size:35px}.question-grid,.case-grid,.replay-notes,.research-grid,.principle-grid,.support-grid,.price-layout{grid-template-columns:1fr}.question-grid article,.case-grid article,.principle-grid article,.support-grid article{min-height:auto}.split-proof{gap:40px}.layer-grid{grid-template-columns:1fr}.layer-grid article{min-height:220px}.quality-states{grid-template-columns:1fr}.boundary-split{grid-template-columns:1fr}.boundary-split>div{padding:28px}.boundary-split>div+div{border-left:0;border-top:1px solid var(--border)}.pricing-callout{align-items:flex-start;flex-direction:column;padding:28px}.final-cta{padding:76px 0 84px}.page-hero{padding:66px 0 52px}.page-hero-inner{min-height:240px}.product-intro{gap:40px}.replay-disclosure,.replay-toolbar{align-items:flex-start;flex-direction:column}.replay-metrics{grid-template-columns:1fr 1fr}.replay-source>div{grid-template-columns:1fr;gap:6px}.price-panel{padding:28px}.price{font-size:40px}.method-shell{display:block;padding-block:36px 80px}.method-nav{position:static;margin-bottom:48px}.method-nav select{display:block}.method-links{display:none}.method-title h2{font-size:34px}.method-title{grid-template-columns:28px 1fr auto}.method-facts{grid-template-columns:1fr}.method-facts div+div{border-left:0;border-top:1px solid var(--border)}.article-page,.legal-page{padding-block:66px 90px}.article-page h1,.legal-page h1{font-size:42px}.article-deck{font-size:18px}.article-page section p,.legal-page section p{font-size:16px}.changelog-list article{grid-template-columns:1fr;gap:14px}.footer-grid{grid-template-columns:1fr 1fr}.footer-brand{grid-column:1/-1}}
@media(max-width:720px){html[lang="zh-CN"] .hero h1{font-size:40px;word-break:auto-phrase}html[lang="zh-CN"] .page-hero h1{font-size:36px;word-break:auto-phrase}}
@media(max-width:420px){.nav-cta{display:none}.replay-metrics{grid-template-columns:1fr}.footer-grid{gap:24px 18px}}
@media(prefers-reduced-motion:reduce){html{scroll-behavior:auto}*,*::before,*::after{animation-duration:.01ms!important;transition-duration:.01ms!important}}
