:root{--paper:var(--ai-paper,#f2efe7);--paper-2:var(--ai-paper-2,#e9e5da);--paper-3:var(--ai-paper-3,#ddd8ca);--ink:var(--ai-ink,#11120f);--muted:rgba(17,18,15,.61);--hair:rgba(17,18,15,.13);--hero-grid:rgba(17,18,15,.055);--signal-dark:var(--ai-structure,#2f4e74);--logo-blue:var(--ai-fold-light,#adc7fd);--sans:"Roboto","Noto Sans SC",sans-serif;--mono:"Roboto","Noto Sans SC",sans-serif;--nav-h:48px;--pad:20px;--max:1280px}
@supports(width:clamp(20px,4.25vw,68px)){:root{--pad:clamp(20px,4.25vw,68px)}}
html{scroll-padding-top:calc(var(--nav-h) + 22px);-webkit-text-size-adjust:100%;text-size-adjust:100%}
body{overflow-x:hidden;font-family:var(--sans)}
html.ai-global-grid body{background-color:var(--paper);background-image:linear-gradient(var(--ai-site-grid,rgba(17,18,15,.055)) 1px,transparent 1px),linear-gradient(90deg,var(--ai-site-grid,rgba(17,18,15,.055)) 1px,transparent 1px);background-size:48px 48px;background-position:calc(50% + 23px) -1px}
#gridShapeCanvas{position:fixed;inset:0;z-index:19;width:100%;height:100%;pointer-events:none;mix-blend-mode:multiply;opacity:1}
html.ai-grid-interaction-loading #gridShapeCanvas{opacity:0}
html.ai-grid-interaction-ready #gridShapeCanvas{opacity:1}
html.is-grid-shape-hover,html.is-grid-shape-hover *{cursor:grab!important}
html.is-grid-hold-pending,html.is-grid-hold-pending *{cursor:crosshair!important}
html.is-grid-shape-carrying,html.is-grid-shape-carrying *{cursor:grabbing!important;user-select:none!important}
html.ai-global-grid .hero{background-position:calc(50% + 23px) -1px}
.ai-grid-aligned-shell{position:relative;left:-1px}
body[data-stage] .hero-side::before,body[data-stage] .scale-side::before{left:var(--ai-grid-guide-shift,0px)}
html[data-ai-page="contact"] #contact-form,html[data-ai-page="join"] .role-content{position:relative;border-left:0}
html[data-ai-page="contact"] #contact-form::before,html[data-ai-page="join"] .role-content::before{content:"";position:absolute;z-index:1;top:0;bottom:0;left:var(--ai-grid-guide-shift,0px);width:1px;background:var(--line)}
html[data-ai-page="join"] .role-content::before{width:3px;background:var(--ai-system)}
html[data-ai-page="join"] .role summary{min-height:95px;padding-top:20px;padding-bottom:20px}
html[data-ai-page="join"] .hero{background-image:linear-gradient(var(--ai-site-grid,rgba(17,18,15,.055)) 1px,transparent 1px),linear-gradient(90deg,var(--ai-site-grid,rgba(17,18,15,.055)) 1px,transparent 1px);background-size:48px 48px;background-position:calc(50% + 23px) -1px}
html[data-ai-page="join"] .mission{background-color:var(--ai-structure);background-image:linear-gradient(rgba(242,239,231,.065) 1px,transparent 1px),linear-gradient(90deg,rgba(242,239,231,.065) 1px,transparent 1px);background-size:48px 48px;background-position:calc(50% + 23px) -1px}
html[data-ai-page="join"] .closing{background-color:var(--paper-2);background-image:linear-gradient(var(--ai-site-grid,rgba(17,18,15,.055)) 1px,transparent 1px),linear-gradient(90deg,var(--ai-site-grid,rgba(17,18,15,.055)) 1px,transparent 1px);background-size:48px 48px;background-position:calc(50% + 23px) -1px}
html[data-ai-page="contact"] .topic{min-height:96px}
html[data-ai-page="contact"] input,html[data-ai-page="contact"] select{min-height:48px;height:48px}
html[data-ai-page="contact"] textarea{min-height:144px}
html[data-ai-page="contact"] #links{min-height:96px!important}
html[data-ai-page="contact"] .send{min-height:48px}
@media(max-width:850px){html[data-ai-page="contact"] #contact-form::before{display:none}}
html[data-ai-page="error"] .error-page{min-height:var(--ai-grid-viewport-height,100svh);grid-template-columns:minmax(0,1fr) minmax(288px,384px)}
html[data-ai-page="error"] .error-copy,html[data-ai-page="error"] .error-panel{transform:translate(var(--ai-grid-box-x,0px),var(--ai-grid-box-y,0px))}
html[data-ai-page="error"] .home-link{min-height:48px}
html[data-ai-page="error"] .error-panel{width:384px;max-width:100%;height:480px;max-height:none;align-self:center;grid-template-rows:48px 384px 48px}
html[data-ai-page="error"] .panel-head,html[data-ai-page="error"] .panel-foot{min-height:48px}
html[data-ai-page="error"] .panel-body{padding:96px 22px 144px;align-content:start}
html[data-ai-page="error"] .data-row{min-height:48px}
@media(max-width:980px){html[data-ai-page="error"] .error-page{grid-template-columns:1fr}html[data-ai-page="error"] .error-panel{justify-self:center}}
@media(max-width:640px){html[data-ai-page="error"] .error-panel{height:384px;grid-template-rows:48px 288px 48px}html[data-ai-page="error"] .panel-body{padding:48px 22px 96px}}
@media(min-width:1021px){
 body[data-stage] .overview-map{min-height:192px}
 body[data-stage] .chapter-section-label{min-height:48px}
 body[data-stage] #chapterGrid.chapter-grid,
 body[data-stage] #chapterGrid .chapter-card{min-height:624px}
 body[data-stage] #chapterGrid.chapter-grid{grid-template-columns:11fr 10fr 9fr}
 body[data-stage] .module-foot{min-height:48px;padding-top:10px;padding-bottom:10px}
 body[data-stage] .model-system-head{min-height:48px}
 body[data-stage] .model-type-field{min-height:432px}
 body[data-stage] .model-system-foot{min-height:48px}
 body[data-stage] .model-release.model-system{margin-bottom:48px}
}
button,input,textarea,select,svg text{font-family:"Roboto","Noto Sans SC",sans-serif}
.site-nav{position:fixed;z-index:100;top:0;right:0;bottom:auto;left:0;inset:0 0 auto;width:auto;min-height:0;height:var(--nav-h);margin:0;padding:0 var(--pad);display:grid;grid-template-columns:1fr auto 1fr;align-items:center;justify-content:normal;gap:0;font-size:initial;font-weight:initial;line-height:normal;background:rgba(242,239,231,.8);border-bottom:1px solid var(--hero-grid);-webkit-backdrop-filter:blur(15px);backdrop-filter:blur(15px);transition:border-color 180ms ease,background 180ms ease;view-transition-name:ai-site-header}
.site-nav.is-scrolled{border-color:var(--hero-grid);background:rgba(242,239,231,.96)}
.site-nav .nav-brand{justify-self:start;display:inline-flex;align-items:flex-end;gap:4px;margin:0;padding:0;color:var(--ink);font:760 10px/1 var(--mono);font-variation-settings:"wght" 760;letter-spacing:.13em;text-decoration:none;text-transform:uppercase;transform:translateY(-3px)}
.site-nav .nav-logo{display:block;width:166px;max-width:100%;height:auto;aspect-ratio:762/163}
.site-nav .nav-brand span{line-height:1.05}
.site-nav .nav-symbol{width:72px;height:36px;display:block;flex:none;margin:0;overflow:visible}
.site-nav .nav-links{display:flex;align-items:center;justify-content:flex-start;gap:28px;margin:0;padding:0}
.site-nav .nav-links a{position:relative;padding:0;color:var(--ink);font-family:"Roboto","Noto Sans SC",sans-serif;font-size:10px;font-weight:720;font-variation-settings:"wght" 720;font-style:normal;line-height:10px;letter-spacing:1.2px;text-decoration:none;text-transform:uppercase}
.site-nav .nav-links .nav-label{position:relative;display:inline-block;padding:0;color:var(--ink);font-family:"Roboto","Noto Sans SC",sans-serif;font-size:10px;font-weight:720;font-variation-settings:"wght" 720;font-style:normal;line-height:10px;letter-spacing:1.2px;text-transform:uppercase}
.site-nav .nav-links .is-locked{opacity:.34;cursor:default;user-select:none}
.site-nav .nav-links a::after{content:"";position:absolute;left:0;right:100%;bottom:-8px;height:1px;background:var(--ai-system,#3f628b);transition:right 170ms ease}
.site-nav .nav-links a:hover::after,.site-nav .nav-links a[aria-current="page"]::after{right:0}
.site-nav .nav-meta{justify-self:end;margin:0;padding:0;color:var(--muted);font:720 8px/1.4 var(--mono);font-variation-settings:"wght" 720;letter-spacing:.12em;text-align:right;text-transform:uppercase}
.site-nav .mobile-menu-toggle,.mobile-menu-panel{display:none}
.page-kicker{color:var(--signal-dark);font:760 12px/1 var(--mono);font-variation-settings:"wght" 760;letter-spacing:.13em;text-transform:uppercase}
.page-title{font-size:clamp(54px,7.2vw,108px);font-weight:620;line-height:.87;letter-spacing:-.055em}
.page-title.page-title--compact{margin:0;font-size:clamp(25px,3.1vw,46px);font-weight:620;line-height:1.02;letter-spacing:-.04em}
.contact{padding-top:calc(64px + var(--nav-h))}
.footer{padding:36px 0;border-top:0;color:var(--ai-paper);background:var(--ai-structure)}
.footer-inner{display:flex;align-items:center;justify-content:space-between;gap:24px;color:var(--ai-paper)}
.footer .brand-logo{width:205px;--logo-a:var(--ai-logo-warm-shadow);--logo-b:var(--ai-logo-warm-mid);--logo-c:var(--ai-logo-warm-light);--logo-type:var(--ai-logo-warm-light)}
.footer small{color:var(--ai-paper);font-size:.8125rem;letter-spacing:.03em}
.footer a{color:var(--ai-paper);font-size:.875rem;text-decoration:none}
.footer :focus-visible{outline-color:var(--ai-fold-light)}
@media(max-width:850px){.contact{padding-top:calc(38px + var(--nav-h))}}
@media(max-width:780px){.footer-inner{flex-wrap:wrap}.footer small{order:3;flex-basis:100%;margin-top:8px}}
@media(max-width:640px){
 :root{--pad:18px;--nav-h:48px}
 html[data-ai-page="join"] .shell,html[data-ai-page="contact"] .shell{width:calc(100% - 36px);max-width:1280px;margin-left:auto;margin-right:auto}
 .site-nav .nav-links,.site-nav .nav-meta{display:none}
 .site-nav>.mobile-menu-toggle{position:absolute!important;z-index:2;top:2px!important;right:var(--pad)!important;bottom:auto!important;left:auto!important;grid-column:3;justify-self:end;width:44px;height:44px;margin:0!important;padding:0;display:flex;align-items:center;justify-content:center;float:none!important;border:0;color:var(--ink);background:transparent;transform:none!important;cursor:pointer}
 .mobile-menu-icon{position:relative;width:22px;height:18px;display:block}
 .mobile-menu-icon i{position:absolute;top:1px;width:8px;height:16px;display:block;background:currentColor;clip-path:polygon(0 0,100% 30%,100% 100%,0 70%);transition:transform 360ms cubic-bezier(.2,.75,.25,1),opacity 220ms ease}
 .mobile-menu-icon i:first-child{left:5px}.mobile-menu-icon i:last-child{right:5px;opacity:.48}
 .site-nav.is-menu-open .mobile-menu-icon i:first-child{transform:translateX(-5px)}
 .site-nav.is-menu-open .mobile-menu-icon i:last-child{transform:translateX(5px);opacity:.72}
 .mobile-menu-panel{position:fixed;z-index:99;top:var(--nav-h);right:0;bottom:0;left:0;inset:var(--nav-h) 0 0;display:block;visibility:hidden;overflow:auto;padding:22px var(--pad) 40px;color:var(--ink);background-color:rgba(242,239,231,.50);-webkit-backdrop-filter:blur(11px);backdrop-filter:blur(11px);opacity:0;transform:translateY(-12px);pointer-events:none;transition:opacity 260ms ease,transform 420ms cubic-bezier(.2,.75,.25,1),visibility 0s linear 420ms}
 .site-nav.is-menu-open + .mobile-menu-panel{visibility:visible;opacity:1;transform:translateY(0);pointer-events:auto;transition-delay:0s}
 .mobile-menu-links{display:flex;flex-direction:column;align-items:flex-end}
 .mobile-menu-links>a,.mobile-menu-links>.nav-label{position:relative;display:block;margin-top:13px;color:var(--ink);font:720 20px/1 var(--mono);font-variation-settings:"wght" 720;letter-spacing:2.4px;text-decoration:none;text-transform:uppercase;opacity:0;transform:translateX(22px);transition:opacity 240ms ease,transform 420ms cubic-bezier(.2,.75,.25,1)}
 .mobile-menu-links>:first-child{margin-top:0}
 .mobile-menu-links>.is-locked{cursor:default;user-select:none}
 .site-nav.is-menu-open + .mobile-menu-panel .mobile-menu-links>*{opacity:1;transform:translateX(0)}
 .site-nav.is-menu-open + .mobile-menu-panel .mobile-menu-links>.is-locked{opacity:.34}
 .site-nav.is-menu-open + .mobile-menu-panel .mobile-menu-links>:nth-child(1){transition-delay:70ms}
 .site-nav.is-menu-open + .mobile-menu-panel .mobile-menu-links>:nth-child(2){transition-delay:105ms}
 .site-nav.is-menu-open + .mobile-menu-panel .mobile-menu-links>:nth-child(3){transition-delay:140ms}
 .site-nav.is-menu-open + .mobile-menu-panel .mobile-menu-links>:nth-child(4){transition-delay:175ms}
 .site-nav.is-menu-open + .mobile-menu-panel .mobile-menu-links>:nth-child(5){transition-delay:210ms}
 body.mobile-menu-open{overflow:hidden}
}
@view-transition{navigation:auto}
::view-transition-group(ai-site-header){z-index:100}
::view-transition-old(ai-site-header),::view-transition-new(ai-site-header){animation:none;mix-blend-mode:normal}
::view-transition-old(root){animation:180ms ease-in both ai-page-out}
::view-transition-new(root){animation:320ms 70ms cubic-bezier(.2,.75,.25,1) both ai-page-in}
@keyframes ai-page-out{to{opacity:0;transform:translateY(-8px)}}
@keyframes ai-page-in{from{opacity:0;transform:translateY(12px)}}
@media(prefers-reduced-motion:reduce){.mobile-menu-panel,.mobile-menu-icon i,.mobile-menu-links a{transition:none!important}::view-transition-old(root),::view-transition-new(root),::view-transition-old(ai-site-header),::view-transition-new(ai-site-header){animation:none}}

/* Exact shared homepage footer. */
#ai-site-footer{display:block;width:100%;max-width:none;min-width:0;margin:0;padding:0;border:0;color:var(--paper);background:var(--signal-dark);font:400 14px/1.5 var(--sans);letter-spacing:normal;text-transform:none}
#ai-site-footer .ai-footer-inner{box-sizing:border-box;width:100%;max-width:none;margin:0;padding:0 var(--pad)}
#ai-site-footer .ai-footer-main{display:grid;grid-template-columns:1fr auto;align-items:center;gap:36px;padding:48px 0 42px}
#ai-site-footer .ai-footer-brand{display:inline-flex;align-items:flex-end;justify-self:start;gap:6px;width:max-content;max-width:100%;margin-left:6.3px;color:var(--paper);text-decoration:none}
#ai-site-footer .ai-footer-logo{display:block;width:205px;max-width:100%;height:auto;aspect-ratio:762/163}
#ai-site-footer .ai-footer-mark{display:block;flex:0 0 auto;width:106px;height:54px}
#ai-site-footer .ai-footer-wordmark{display:block;padding-bottom:1px;font:760 15px/1.05 var(--sans);font-variation-settings:"wght" 760;letter-spacing:.13em;text-transform:uppercase}
#ai-site-footer .ai-footer-tagline{justify-self:end;margin:0;color:var(--paper);font:650 14px/1.4 var(--sans);letter-spacing:.12em;text-transform:uppercase;white-space:nowrap}
#ai-site-footer .ai-footer-bottom{display:grid;grid-template-columns:1fr auto 1fr;align-items:center;gap:32px;min-height:72px;padding:19px 0 22px;border-top:1px solid rgba(242,239,231,.24)}
#ai-site-footer .ai-footer-copyright{justify-self:start;margin:0;color:var(--paper);font:600 11px/1.5 var(--sans);letter-spacing:.095em;text-transform:uppercase}
#ai-site-footer .ai-footer-socials{display:flex;align-items:center;justify-self:center;gap:13px}
#ai-site-footer .ai-footer-social{position:relative;display:inline-flex;align-items:center;justify-content:center;flex:0 0 auto;width:44px;height:44px;padding:0;border:0;color:var(--paper);background:transparent;text-decoration:none;cursor:pointer;transition:color 160ms ease,transform 160ms ease}
#ai-site-footer .ai-footer-social:hover,#ai-site-footer .ai-footer-social:focus-visible{color:var(--logo-blue);transform:translateY(-2px)}
#ai-site-footer .ai-footer-social svg{display:block;width:23px;height:23px;fill:currentColor}
#ai-site-footer .ai-footer-social[data-ai-social="wechat"] svg{width:28px;height:28px}
#ai-site-footer .ai-footer-social[data-ai-social="xiaohongshu"]{width:54px}
#ai-site-footer .ai-footer-xhs{font:900 16px/1 "Noto Sans SC","Roboto",sans-serif;letter-spacing:-.075em;white-space:nowrap}
#ai-site-footer .ai-footer-icp{justify-self:end;margin:0;color:var(--paper);font:600 11px/1.5 var(--sans);letter-spacing:.095em;text-transform:uppercase;text-align:right}
#ai-site-footer a:focus-visible,#ai-site-footer button:focus-visible{outline:2px solid var(--logo-blue);outline-offset:5px}
#ai-site-footer .ai-footer-qr{position:absolute;z-index:5;left:50%;bottom:calc(100% + 10px);width:180px;padding:9px;display:block;background:var(--paper);border:1px solid rgba(242,239,231,.8);box-shadow:0 18px 42px rgba(17,18,15,.24);opacity:0;visibility:hidden;pointer-events:none;transform:translate(-50%,10px) scale(.94);transform-origin:center bottom;transition:opacity 180ms ease,transform 260ms cubic-bezier(.2,.75,.25,1),visibility 0s linear 260ms}
#ai-site-footer .ai-footer-qr::after{content:"";position:absolute;left:0;right:0;top:100%;height:12px}
#ai-site-footer .ai-footer-qr img{width:100%;height:auto;display:block}
#ai-site-footer .ai-footer-social.is-open .ai-footer-qr,#ai-site-footer .ai-footer-social:hover .ai-footer-qr{opacity:1;visibility:visible;pointer-events:auto;transform:translate(-50%,0) scale(1);transition-delay:0s}
#ai-site-footer .ai-footer-social:focus-visible .ai-footer-qr{opacity:1;visibility:visible;pointer-events:auto;transform:translate(-50%,0) scale(1);transition-delay:0s}
@media(min-width:1540px){#ai-site-footer .ai-footer-main{padding-top:52px;padding-bottom:46px}}
@media(max-width:1000px){#ai-site-footer .ai-footer-main{gap:24px;padding:36px 0 32px}#ai-site-footer .ai-footer-bottom{grid-template-columns:1fr auto;gap:10px 24px}#ai-site-footer .ai-footer-copyright{grid-column:1;grid-row:1}#ai-site-footer .ai-footer-socials{grid-column:2;grid-row:1}#ai-site-footer .ai-footer-icp{grid-column:1/-1;grid-row:2}}
@media(max-width:620px){#ai-site-footer .ai-footer-main{grid-template-columns:1fr;gap:22px}#ai-site-footer .ai-footer-mark{width:90px;height:46px}#ai-site-footer .ai-footer-wordmark{font-size:13px}#ai-site-footer .ai-footer-brand{gap:5px}#ai-site-footer .ai-footer-tagline{justify-self:start;font-size:12px}#ai-site-footer .ai-footer-bottom{grid-template-columns:1fr;padding-top:16px;padding-bottom:22px;gap:12px}#ai-site-footer .ai-footer-socials{grid-column:1;grid-row:2;justify-self:start;gap:18px;margin-left:-9px}#ai-site-footer .ai-footer-copyright{grid-column:1;grid-row:1;font-size:10px;letter-spacing:.055em}#ai-site-footer .ai-footer-icp{grid-column:1;grid-row:3;justify-self:start;max-width:100%;font-size:10px;letter-spacing:.055em;text-align:left}#ai-site-footer .ai-footer-social[data-ai-social="x"] .ai-footer-qr{left:9px}#ai-site-footer .ai-footer-social[data-ai-social="wechat"] .ai-footer-qr{left:-52px}#ai-site-footer .ai-footer-social[data-ai-social="xiaohongshu"] .ai-footer-qr{left:0}#ai-site-footer .ai-footer-qr{transform:translate(0,10px) scale(.94);transform-origin:left bottom}#ai-site-footer .ai-footer-social.is-open .ai-footer-qr,#ai-site-footer .ai-footer-social:hover .ai-footer-qr{transform:translate(0,0) scale(1)}#ai-site-footer .ai-footer-social:focus-visible .ai-footer-qr{transform:translate(0,0) scale(1)}}
@media(max-width:620px){#ai-site-footer .ai-footer-logo{width:180px}}
@media(max-width:560px){.page-title{font-size:9.8vw;font-size:clamp(30px,9.8vw,42px)}}
/* Hide only structural guide lines that can cross single-column mobile copy. */
@media(max-width:640px){
 body[data-stage] .hero-side::before,
 body[data-stage] .scale-side::before,
 html[data-ai-page="contact"] #contact-form::before,
 html[data-ai-page="join"] .role-content::before{display:none}
}
@media(prefers-reduced-motion:reduce){#ai-site-footer a,#ai-site-footer button,#ai-site-footer .ai-footer-qr{transition:none}}