/* Frontier — Convergence. Shared layout and the approved full-frame ASCII hero. */
:root{--bg:#121310;--fg:#eeeae2;--muted:#aaa69d;--orange:#ff642d;--accent:var(--orange);--fg-soft:var(--muted);--line:#383932;--grotesk:'Space Grotesk',Arial,sans-serif;--sans:Inter,Arial,sans-serif;--mono:'IBM Plex Mono',monospace;--gutter:44px}
*{box-sizing:border-box}
html{scroll-behavior:smooth;scroll-padding-top:100px}
body{margin:0;background:var(--bg);color:var(--fg);font-family:var(--sans);-webkit-font-smoothing:antialiased}
::selection{background:var(--orange);color:var(--bg)}
a{color:inherit;text-decoration:none}button{font:inherit}button,a{-webkit-tap-highlight-color:transparent}
p{margin:0}a,button,summary{touch-action:manipulation}
:focus-visible{outline:2px solid var(--orange);outline-offset:5px}[hidden]{display:none!important}
.skip{position:fixed;z-index:100;left:16px;top:12px;transform:translateY(-180%);padding:12px;background:var(--orange);color:var(--bg)}.skip:focus{transform:none}
.accent{color:var(--orange)}
.site-header{position:fixed;top:0;left:0;right:0;z-index:20;width:100%;margin:0;height:88px;padding:0 var(--gutter);display:flex;align-items:center;justify-content:space-between;gap:24px;border-bottom:1px solid transparent;transition:background .25s,border-color .25s}
.site-header.scrolled{background:rgba(18,19,16,.97);border-color:var(--line)}
.site-header .brand{display:flex;align-items:center;min-height:44px;font:500 .72rem/1.4 var(--mono);letter-spacing:.18em;text-transform:uppercase;white-space:nowrap;color:var(--fg)}
.site-header .brand-compact{display:none}
.site-header nav{display:flex;align-items:center;gap:40px}
.site-header .nav-thesis{display:flex;align-items:center;gap:12px;min-height:44px;font:12px var(--sans);color:var(--muted)}
.site-header .contact{display:flex;align-items:center;gap:23px;min-height:44px;font:12px var(--sans);border:0;padding:0;border-radius:0;background:transparent;color:var(--fg)}
.site-header .contact>span:last-child{width:30px;height:36px;display:grid;place-items:center;font-size:23px}
.site-header a:hover{color:var(--orange)}
.hero{position:relative;isolation:isolate;min-height:680px;height:100svh;display:flex;align-items:flex-end;padding:160px 0 max(80px,12svh);overflow:hidden}
.hero-copy{position:relative;z-index:2;width:calc(100% - 2*var(--gutter));max-width:1760px;margin:0 auto;pointer-events:none}
.hero-copy h1{margin:0;font:600 clamp(50px,5.2vw,90px)/1.02 var(--grotesk);letter-spacing:-.045em}
.hero-copy h1 span{color:var(--orange)}
.hero-copy p{max-width:515px;font-size:14px;line-height:1.65;color:#d6d1c7;margin:26px 0 0;text-wrap:pretty}
.field{position:absolute;inset:0;z-index:0;overflow:hidden;margin:0;background:#080807}
.field video,.field canvas{position:absolute;inset:0;display:block;width:100%;height:100%;object-fit:cover;object-position:52% center}
.field canvas{image-rendering:pixelated}.field video{opacity:1}.field canvas{opacity:0}.field.ready canvas{opacity:1}.field.ready video{opacity:0;pointer-events:none}
.film-shade{position:absolute;inset:0;pointer-events:none;background:linear-gradient(90deg,rgba(7,8,6,.80) 0%,rgba(7,8,6,.49) 28%,rgba(7,8,6,.09) 60%,transparent 85%),linear-gradient(180deg,rgba(7,8,6,.68) 0%,transparent 24%,transparent 50%,rgba(7,8,6,.58) 100%);z-index:1}
.motion-control{position:absolute;z-index:3;right:var(--gutter);bottom:26px;display:grid;place-items:center;width:44px;height:44px;padding:13px;background:transparent;border:0;color:#ded8cb8c;cursor:pointer;transition:color .2s}
.motion-control:hover,.motion-control:focus-visible{color:var(--fg)}
.motion-control svg{height:16px;width:16px;stroke:currentColor;stroke-width:1.5;fill:none}.play-icon{display:none}.motion-control[aria-pressed=false] .pause-icon{display:none}.motion-control[aria-pressed=false] .play-icon{display:initial}

/* Quiet chapter typography. The drawings remain literal and readable. */
.inner,.site-footer{width:calc(100% - 2*var(--gutter));max-width:1440px;margin:0 auto}
.home-page main>section:not(.hero){padding:112px 0;border-top:1px solid var(--line)}
.home-page h2{font:500 clamp(36px,4.2vw,67px)/1.06 var(--grotesk);letter-spacing:-.048em;margin:0;text-wrap:balance}
.home-page h2 .out{color:var(--orange)}
.home-page h3{font-family:var(--grotesk);font-weight:500;letter-spacing:-.035em;margin:0}
.home-page .split{display:grid;grid-template-columns:1.1fr 1fr;gap:9%;align-items:start}
.home-page .note{font:14px/1.85 var(--sans);color:var(--muted);max-width:520px;text-wrap:pretty;align-self:end}
.home-page .lede{font:19px/1.65 var(--sans);color:var(--fg);max-width:680px;text-wrap:pretty}
.mono{font:10px/1.6 var(--mono);letter-spacing:.1em;text-transform:uppercase}
.chap-head{display:flex;align-items:center;gap:16px;margin:0 0 42px}
.chap-head .num{font:11px var(--mono);color:var(--orange);min-width:20px}
.chap-head .label{color:var(--muted)}
.chap-head .rule{height:1px;background:var(--line);flex:1;margin-left:14px}
.deep-link{display:inline-flex;align-items:center;gap:15px;margin-top:24px;color:var(--fg);font-size:12px;line-height:1.6;border-bottom:1px solid var(--line);padding-bottom:7px}
.deep-link span{color:var(--orange)}.deep-link:hover{color:var(--orange)}
.cta{display:inline-flex;align-items:center;justify-content:space-between;gap:28px;margin-top:32px;padding:16px 0;border-bottom:1px solid var(--orange);font:13px/1.5 var(--sans);transition:color .2s}
.cta::after{content:'↗';font:22px/1 var(--sans);color:var(--orange)}
.cta:hover{color:var(--orange)}
.fig{position:relative;margin-top:56px;border-top:1px solid var(--line);border-bottom:1px solid var(--line)}
.fig canvas{display:block;width:100%;height:100%}
.fig svg{display:block;width:100%;height:auto}
.annot{position:absolute;font:10px/1.5 var(--mono);color:var(--muted);letter-spacing:.03em;background:var(--bg);padding:5px 9px}
.annot .tick{display:inline-block;vertical-align:middle;width:18px;height:1px;background:var(--orange);margin-right:9px}
#mythe .fig{height:300px}
.appui{display:grid;grid-template-columns:repeat(3,1fr);gap:5%;padding:34px 0 0}
.datum .big{font:500 clamp(40px,5vw,76px)/1 var(--grotesk);letter-spacing:-.065em}
.datum p{font:12px/1.7 var(--sans);color:var(--muted);max-width:235px;margin-top:13px}
.source-note{margin-top:29px;font:9px/1.75 var(--mono);color:var(--muted)}
.source-note a{color:var(--fg);text-decoration:underline;text-underline-offset:4px;text-decoration-color:var(--line)}
.stroke-label,.node-label{font-family:var(--mono);font-size:13px;letter-spacing:.6px;fill:var(--muted)}
.stroke-label.acc,.node-label.acc{fill:var(--orange)}
#metier .fig,#geste .fig{padding:24px 0 0;border-bottom:0}
.capacity-mobile,.gesture-mobile{display:none}
#renversement .inner>div{max-width:none}
#renversement h2{max-width:1200px;font-size:clamp(42px,6.25vw,96px)}
#renversement .lede{max-width:770px;margin-top:32px}
#renversement .note{max-width:720px;margin-top:20px}
.river{height:205px;position:relative;margin:32px 0 0;overflow:hidden}
.river canvas{display:block;width:100%;height:100%}
.mode-pair{display:grid;grid-template-columns:1fr 1fr;gap:9%;border-top:1px solid var(--line)}
.mode-pair>div{padding:26px 0 0}
.mode-pair .mode-title{font:500 24px/1.2 var(--grotesk);text-transform:none;letter-spacing:-.025em;color:var(--orange)}
.mode-pair p:last-child{font:14px/1.75 var(--sans);color:var(--muted);max-width:400px;margin-top:10px}
#mesure .fig{height:400px}
.lane-label{position:absolute;left:16px;padding:5px 10px;background:var(--bg);color:var(--fg);font-size:10px;letter-spacing:.04em}
.metrics{margin-top:24px;display:flex;align-items:center;flex-wrap:wrap;gap:13px;font:10px/1.7 var(--mono);color:var(--muted)}.metrics .dot{color:var(--orange)}
.proof-grid{display:grid;grid-template-columns:repeat(4,minmax(0,1fr));margin-top:54px;border-top:1px solid var(--line);border-bottom:1px solid var(--line)}
.proof-step{padding:28px 24px 32px 0}.proof-step+.proof-step{padding-left:24px;border-left:1px solid var(--line)}
.proof-step .step-no{display:block;margin-bottom:48px;font-size:11px;color:var(--orange)}
.proof-step h3{font-size:22px;line-height:1.15}.proof-step p{margin-top:13px;font-size:12px;line-height:1.7;color:var(--muted);max-width:260px}
.operator-band{display:grid;grid-template-columns:1.1fr 1fr;gap:9%;padding-top:86px}
.operator-label{color:var(--orange);margin-bottom:22px}
.operator-band h3{font-size:clamp(32px,3.6vw,52px);line-height:1.08;max-width:490px}
.operator-copy p{font-size:14px;line-height:1.85;color:var(--muted);text-wrap:pretty}
.operator-copy strong{display:block;font-size:15px;font-weight:500;line-height:1.65;margin-top:23px}
.operator-actions{display:flex;gap:28px;flex-wrap:wrap}.operator-actions .cta{font-size:12px;margin-top:18px}
#faq .inner{display:grid;grid-template-columns:1fr 2fr;column-gap:9%;align-items:start}
#faq .chap-head{grid-column:1;grid-row:1/9;display:block;position:sticky;top:132px}
#faq .chap-head .num,#faq .chap-head .rule{display:none}
#faq .chap-head .label{font:500 clamp(28px,3vw,44px)/1.1 var(--grotesk);color:var(--fg);letter-spacing:-.04em;text-transform:none}
#faq details{grid-column:2;border-top:1px solid var(--line)}#faq details:last-child{border-bottom:1px solid var(--line)}
#faq summary{display:flex;align-items:center;justify-content:space-between;gap:25px;padding:24px 0;cursor:pointer;list-style:none;font:500 18px/1.4 var(--grotesk);letter-spacing:-.02em}
#faq summary::-webkit-details-marker{display:none}
#faq .plus{font:20px/1 var(--sans);color:var(--orange);flex-shrink:0;transition:transform .2s}
#faq details[open] .plus{transform:rotate(45deg)}
#faq .answer{padding:0 28px 28px 0;max-width:640px;font-size:14px;line-height:1.8;color:var(--muted)}
#finale{overflow:hidden}#finale .split{align-items:center}
#finale h2{margin-top:22px}#finale .note{margin-top:25px}
#finale .map{position:relative;isolation:isolate}
#finale .map svg{position:relative;z-index:1;display:block;width:100%;height:auto}
#finale .map-texture{position:absolute;inset:-5% -10%;height:110%;width:120%;opacity:.65;z-index:0}
#finale .email{font:10px/1.8 var(--mono);letter-spacing:.03em;color:var(--muted);margin-top:18px}
.site-footer{min-height:116px;border-top:1px solid var(--line);display:flex;align-items:center;justify-content:space-between;gap:24px;flex-wrap:wrap;font:9px/1.6 var(--mono);letter-spacing:.05em;color:var(--muted);padding:28px 0}
.site-footer a{display:flex;align-items:center;gap:16px;min-height:44px}.site-footer a:hover{color:var(--orange)}
.site-footer .footer-brand{display:block;line-height:44px;letter-spacing:.12em;color:var(--fg)}
@media(min-width:1650px){.hero-copy p{font-size:16px;max-width:580px}.home-page .note,.operator-copy p{font-size:16px}}
@media(max-width:1150px){:root{--gutter:32px}.hero-copy h1{font-size:5.8vw}.home-page .split,.operator-band{gap:6%}.site-header nav{gap:28px}}
@media(max-width:900px){
.home-page main>section:not(.hero){padding:80px 0}
.home-page .split{grid-template-columns:1fr;gap:28px}.home-page .note{max-width:650px}.home-page h2{max-width:750px;font-size:clamp(38px,6.4vw,62px)}
.chap-head{margin-bottom:32px}.operator-band{gap:35px}.proof-step{padding-right:18px}.proof-step+.proof-step{padding-left:18px}.proof-step h3{font-size:19px}
#faq .inner{column-gap:6%}#faq summary{font-size:17px}
#finale .split{grid-template-columns:1.2fr 1fr;gap:20px}#finale h2{font-size:42px}
}
@media(max-width:800px){:root{--gutter:28px}.hero{min-height:700px;padding-bottom:11svh}.hero-copy h1{font-size:7.4vw}.hero-copy p{font-size:13px;max-width:470px}.film-shade{background:linear-gradient(180deg,rgba(7,8,6,.60),transparent 26%,rgba(7,8,6,.15) 45%,rgba(7,8,6,.85) 100%),linear-gradient(90deg,rgba(7,8,6,.33),transparent 78%)}.site-header .nav-thesis{display:none}}
@media(max-width:700px){
.site-header{height:76px}.site-header .brand-full{display:none}.site-header .brand-compact{display:inline}
.home-page main>section:not(.hero){padding:64px 0}.home-page h2{font-size:clamp(36px,7.7vw,49px)}
.home-page .note{font-size:13px;line-height:1.85}.home-page .lede{font-size:17px}
.fig{margin-top:32px}#mythe .fig{height:250px}.annot{font-size:8px}.annot .tick{width:12px;margin-right:5px}
.appui{gap:18px}.datum .big{font-size:44px}.datum p{font-size:10px;line-height:1.65}.source-note{font-size:8px}
#metier .fig,#geste .fig{display:none}.capacity-mobile,.gesture-mobile{display:grid;margin-top:34px;border-top:1px solid var(--line)}
.capacity-mobile>div,.gesture-mobile>div{padding:18px 0;border-bottom:1px solid var(--line)}
.mobile-title{color:var(--orange);font-size:10px;margin-bottom:7px}.capacity-mobile p:last-child,.gesture-mobile p:last-child{font-size:13px;line-height:1.7;color:var(--muted)}
.gesture-mobile>div{display:grid;grid-template-columns:1fr 1fr;gap:15px}.gesture-mobile .mobile-title{margin:0;align-self:center}
#renversement h2{font-size:clamp(38px,8.3vw,58px)}#renversement .lede{margin-top:24px}.river{height:160px;margin-top:10px}
.mode-pair{gap:24px}.mode-pair .mode-title{font-size:22px}.mode-pair p:last-child{font-size:12px}
#mesure .fig{height:340px}.lane-label{left:4px;font-size:8px}.metrics{gap:9px;font-size:9px}
.proof-grid{grid-template-columns:1fr 1fr;margin-top:35px}.proof-step .step-no{margin-bottom:30px}.proof-step:nth-child(3){border-left:0;border-top:1px solid var(--line);padding-left:0}.proof-step:nth-child(4){border-top:1px solid var(--line)}
.operator-band{grid-template-columns:1fr;padding-top:55px;gap:26px}.operator-band h3{font-size:36px;max-width:440px}.operator-copy p{font-size:13px}.operator-copy strong{font-size:14px}
#faq .inner{display:block}#faq .chap-head{position:static;margin-bottom:30px}#faq .chap-head .label{font-size:34px}#faq summary{font-size:17px;padding:22px 0}#faq .answer{font-size:13px;padding-right:12px}
#finale .split{grid-template-columns:1fr}#finale h2{font-size:42px}#finale .map{width:88%;max-width:440px;justify-self:center;margin:20px 0 -25px}
.site-footer{justify-content:flex-start;gap:5px 24px;font-size:8px}.site-footer>a:nth-child(2){order:3;width:100%}.site-footer>span{margin-left:auto}.site-footer .footer-brand{letter-spacing:.06em}
}
@media(max-width:480px){:root{--gutter:20px}.site-header{gap:16px}.site-header .brand{font-size:.66rem}.site-header .contact{font-size:10px;line-height:1.4;gap:7px}.site-header .contact>span:first-child{max-width:105px}.site-header .contact>span:last-child{font-size:21px;width:24px;flex-shrink:0}.hero{min-height:650px;padding-top:140px;padding-bottom:10svh}.hero-copy h1{font-size:9.5vw;line-height:1.06}.hero-copy p{font-size:12px;line-height:1.7;max-width:340px;margin-top:22px}.motion-control{right:10px;bottom:15px}.datum .big{font-size:37px}.datum p{font-size:10px}.appui{gap:14px}.chap-head .mono{font-size:9px}.home-page .note{font-size:13px}.mode-pair{gap:20px}.proof-step h3{font-size:20px}}
@media(prefers-reduced-motion:reduce){html{scroll-behavior:auto}*,*:before,*:after{transition:none!important;animation:none!important}}