/* GenLayer Labs site v2 — shared chrome + module styles.
   Chrome lifted from prototypes/index.html, adapted from scroll-snap to natural long-scroll. */

@font-face{font-family:'Newsreader';src:url('../assets/fonts/Newsreader-Var.woff2') format('woff2');font-weight:400 600;font-style:normal;font-display:swap}
@font-face{font-family:'Newsreader';src:url('../assets/fonts/Newsreader-Italic.woff2') format('woff2');font-weight:400 600;font-style:italic;font-display:swap}
@font-face{font-family:'F37 Lineca';src:url('../assets/fonts/F37Lineca-Regular.otf') format('opentype');font-weight:400;font-display:swap}
@font-face{font-family:'F37 Lineca';src:url('../assets/fonts/F37Lineca-Medium.otf') format('opentype');font-weight:500;font-display:swap}
@font-face{font-family:'F37 Lineca';src:url('../assets/fonts/F37Lineca-Bold.otf') format('opentype');font-weight:700;font-display:swap}
@font-face{font-family:'Switzer';src:url('../assets/fonts/Switzer-Extralight.woff2') format('woff2');font-weight:200;font-display:swap}
@font-face{font-family:'Switzer';src:url('../assets/fonts/Switzer-Light.woff2') format('woff2');font-weight:300;font-display:swap}
@font-face{font-family:'Switzer';src:url('../assets/fonts/Switzer-Regular.woff2') format('woff2');font-weight:400;font-display:swap}
@font-face{font-family:'Switzer';src:url('../assets/fonts/Switzer-Medium.woff2') format('woff2');font-weight:500;font-display:swap}
@font-face{font-family:'Switzer';src:url('../assets/fonts/Switzer-Semibold.woff2') format('woff2');font-weight:600;font-display:swap}
@font-face{font-family:'Switzer';src:url('../assets/fonts/Switzer-Bold.woff2') format('woff2');font-weight:700;font-display:swap}

:root{
  --paper:#FFFFFF;
  --paper-2:#FFFFFF;
  --fig-bg:#FFFFFF;
  --ink:#13151B;
  --ink-2:#4B505C;
  --muted:#8A8E98;
  --line:#ECECEC;
  --line-2:#DADADA;
  --brand:#4500F9;
  --brand-soft:#6459FF;
  --brand-deep:#3B00DB;
  /* motion register — the drafting gesture: arrivals settle long and decelerate
     (a line drawn and coming to rest), exits are quick and quiet. One curve pair
     everywhere; no element invents its own timing. */
  --ease-draft:cubic-bezier(.19,1,.22,1);
  --ease-exit:cubic-bezier(.4,0,.6,1);
  --display:'Newsreader',Georgia,'Times New Roman',serif;
  --display-sans:'F37 Lineca','Switzer',-apple-system,BlinkMacSystemFont,'Segoe UI',sans-serif;
  --sans:'Switzer',-apple-system,BlinkMacSystemFont,'Segoe UI',sans-serif;
  --mono:ui-monospace,'SF Mono',Menlo,monospace;
  --maxw:1380px;
  --contentw:1240px;
  --copyw:35ch;
  --measure:56ch;
  --gutter:clamp(24px,4vw,72px);
  --section-gap:clamp(36px,4.2vw,72px);
  --hero-split:minmax(440px,1fr) minmax(0,1.18fr);
  --split:minmax(300px,25rem) minmax(0,1.74fr);
}

*,*::before,*::after{box-sizing:border-box}
html{-webkit-text-size-adjust:100%;scroll-behavior:smooth;scroll-snap-type:y proximity;scroll-padding-top:0}
body{margin:0;background:var(--paper);color:var(--ink);font-family:var(--sans);font-size:18px;line-height:1.6;font-weight:400;-webkit-font-smoothing:antialiased;text-rendering:optimizeLegibility}
h1,h2,h3,h4{font-family:var(--display);font-weight:400;margin:0;letter-spacing:-.03em;color:var(--ink)}
p{margin:0}
a{color:inherit;text-decoration:none}
.em{font-style:italic;color:var(--brand)}
.label{display:block;font-family:var(--mono);text-transform:uppercase;letter-spacing:.16em;font-size:11px;line-height:1.5;color:var(--muted);margin:0 0 18px}
.label .idx{color:var(--brand)}
.skip{position:absolute;left:-9999px;top:0;z-index:300;background:var(--ink);color:#fff;padding:10px 16px;border-radius:0 0 8px 0;font-family:var(--mono);font-size:12px;letter-spacing:.08em}
.skip:focus{left:0}
a:focus-visible,button:focus-visible,.rail-item:focus-visible{outline:2px solid var(--brand);outline-offset:3px;border-radius:4px}

.nav{position:fixed;top:0;left:0;right:0;z-index:120;background:rgba(255,255,255,.82);backdrop-filter:saturate(140%) blur(16px);-webkit-backdrop-filter:saturate(140%) blur(16px);border-bottom:1px solid rgba(20,20,24,.07)}
.nav-inner{max-width:var(--maxw);margin:0 auto;padding:14px var(--gutter);display:flex;align-items:center;gap:24px}
.brand{font-family:var(--display-sans);font-size:18px;font-weight:500;letter-spacing:-.03em;white-space:nowrap;display:inline-flex;align-items:center;gap:.5em;color:var(--ink)}.brand .dot{color:var(--brand)}.gl-mark{width:1.22em;height:1.15em;flex:none;fill:currentColor}
.nav-links{display:flex;gap:24px;margin-left:auto;align-items:center}
.nav-links a:not(.btn){font-family:var(--mono);font-size:11px;letter-spacing:.06em;text-transform:uppercase;color:var(--ink-2);position:relative;padding:4px 0}
.nav-links a:not(.btn)::after{content:"";position:absolute;left:0;bottom:0;width:0;height:1px;background:var(--brand);transition:width .22s ease}
.nav-links a:not(.btn):hover::after{width:100%}
.btn{display:inline-flex;align-items:center;gap:8px;font-family:var(--mono);font-size:11px;letter-spacing:.06em;text-transform:uppercase;padding:10px 18px;border-radius:999px;border:1px solid transparent;transition:background .3s var(--ease-draft),border-color .3s var(--ease-draft),color .3s var(--ease-draft);white-space:nowrap;cursor:pointer}
.btn-primary{background:var(--brand);color:#fff}.btn-primary:hover{background:var(--brand-deep)}
.btn-ghost{border-color:var(--line-2);color:var(--ink)}.btn-ghost:hover{border-color:var(--brand);color:var(--brand)}
.nav .btn{padding:9px 16px}

/* ---- natural long-scroll layout (replaces scroll-snap) ---- */
main{display:block;overflow-x:clip}
/* magnetic full-viewport stages: each section snaps to the top, content vertically
   centered; `safe center` falls back to top-align when a section is taller than the
   viewport so nothing gets trapped behind the fixed nav */
.section{position:relative;min-height:100vh;display:flex;align-items:safe center;scroll-snap-align:start;scroll-snap-stop:always;border-top:1px solid var(--line)}
.section:first-of-type{border-top:0}
.section-inner{width:100%;max-width:var(--maxw);margin:0 auto;padding:clamp(108px,14vh,140px) calc(var(--gutter) + 30px) clamp(76px,9vh,104px) var(--gutter)}
.section-inner > *{width:100%;max-width:var(--contentw);margin-left:0;margin-right:auto}
.hero .section-inner{padding-top:clamp(112px,15vh,160px)}

/* ---- v3 hierarchy: stages dominate, coda recedes ----
   Base .section = a full-viewport snapping STAGE (hero, thesis, the 4 core
   systems, the closing CTA). `.coda` sections (incubated, origins, research,
   team, definitions) drop the full-screen snap and flow as one quiet movement
   with a smaller type tier — the "lab beneath the surface". */
.section.coda{min-height:0;display:block;scroll-snap-align:none;scroll-snap-stop:normal}
.section.coda .section-inner{padding-top:clamp(52px,7vh,88px);padding-bottom:clamp(52px,7vh,88px)}
.section.coda .sec-title{font-size:clamp(1.6rem,2.4vw,2.3rem);line-height:1.12;max-width:30ch;margin-bottom:16px}
.section.coda .sec-body{font-size:clamp(1rem,1.1vw,1.12rem);max-width:60ch}
/* origins compresses to a slim band; definitions sit quietest of all */
.section.coda .timeline{margin-top:clamp(26px,3.4vw,42px)}
.section.coda .origin-note{margin-top:clamp(26px,3vw,40px)}
#faq.coda .section-inner{padding-top:clamp(40px,5vh,64px);padding-bottom:clamp(56px,7vh,88px)}
#faq.coda .sec-title{font-size:clamp(1.4rem,2vw,1.95rem)}

.rail{position:fixed;top:50%;right:15px;transform:translateY(-50%);z-index:110;display:flex;flex-direction:column;align-items:flex-end;gap:3px;padding:6px 0}
.rail-group-label{display:block;width:12px;height:1px;background:var(--line-2);opacity:.7;margin:9px 6px 9px auto;font-size:0;text-indent:-9999px;overflow:hidden}
.rail-item{display:flex;align-items:center;justify-content:flex-end;gap:10px;background:none;border:0;cursor:pointer;padding:4px 2px;font-family:var(--mono);font-size:9.5px;letter-spacing:.08em;text-transform:uppercase;color:var(--muted);transition:color .2s ease}
.rail-item .rt{opacity:0;transform:translateX(5px);transition:opacity .2s ease,transform .2s ease;color:var(--ink);background:var(--paper-2);border:1px solid var(--line);border-radius:7px;padding:4px 10px;box-shadow:0 6px 20px rgba(20,22,29,.1);white-space:nowrap;pointer-events:none}
.rail-item .rd{width:7px;height:7px;border-radius:50%;border:1.4px solid var(--line-2);transition:all .25s ease;flex:none}
.rail-item:hover .rt,.rail-item:focus-visible .rt{opacity:1;transform:none}
.rail-item:hover .rd{border-color:var(--brand)}
.rail-item.active{color:var(--ink)}.rail-item.active .rd{background:var(--brand);border-color:var(--brand);transform:scale(1.18);box-shadow:0 0 0 4px rgba(69,0,249,.12)}
/* the lab (coda) group recedes on the rail until it is the active section */
.rail-item--lab{opacity:.55}.rail-item--lab:hover,.rail-item--lab.active{opacity:1}
.rail-thread{position:fixed;top:50%;right:18px;transform:translateY(-50%);width:1px;height:clamp(200px,42vh,400px);background:var(--line);z-index:105;overflow:hidden}
.rail-thread .fill{position:absolute;left:0;top:0;width:100%;height:0%;background:linear-gradient(var(--brand),var(--brand-soft));transition:height .15s linear}

.hero-grid,.plate{display:grid;grid-template-columns:var(--hero-split);gap:var(--section-gap);align-items:center;width:100%}
.plate{grid-template-columns:var(--split);align-items:center;column-gap:0}
.hero-copy,.copy{max-width:var(--measure);justify-self:start}
.hero-copy .label{margin-bottom:18px}
.hero-title{font-size:clamp(3.3rem,4.6vw,4.7rem);line-height:1.0;margin-bottom:22px;max-width:none;text-wrap:balance}
.hero-sub{font-size:clamp(1.04rem,1.2vw,1.16rem);line-height:1.6;color:var(--ink-2);font-weight:300;max-width:44ch;margin-bottom:18px}
.hero-support{font-size:13.5px;line-height:1.65;color:var(--muted);max-width:44ch;margin-bottom:28px}
.hero-cta{display:flex;gap:13px;flex-wrap:wrap}
.hero-visual{position:relative;padding:0;min-width:0}
.hero-visual .fig.r169{aspect-ratio:16/9;max-height:min(90vh,860px);margin-right:clamp(-180px,-11vw,-40px)}
.hero-grid{gap:clamp(28px,3vw,52px)}

.fig{position:relative;width:100%;background:none;border:0;border-radius:0;overflow:visible;box-shadow:none}
.fig.r169{aspect-ratio:16/10;max-height:min(60vh,560px)}
.fig iframe{width:100%;height:100%;border:0;display:block;background:transparent}
/* diagrams ride their own z-layer: larger, free to overlap the copy column */
.plate .copy{position:relative;z-index:3}
.plate > .fig,.plate > .fig-stack{position:relative;z-index:1}
.plate > .fig.r169{margin-left:clamp(-80px,-4vw,-16px);margin-right:clamp(-210px,-12.5vw,-64px);aspect-ratio:16/9;max-height:min(98vh,1060px)}
.plate > .fig-stack{margin-left:clamp(-90px,-4.4vw,-32px);margin-right:clamp(-32px,-2.2vw,-10px)}
/* core systems are the dominant movement: largest headline after the hero,
   and the diagram is the hero of each module — the caption stays slim */
.plate .copy .sec-title{font-size:clamp(2.5rem,3.9vw,3.78rem);line-height:1.05;margin-bottom:18px}
.plate .copy .sec-body{max-width:34ch}
.plate .copy .tags{margin:22px 0 24px}

/* ---- shared section heads ---- */
.sec-title{font-size:clamp(2.2rem,3.3vw,3.35rem);line-height:1.08;max-width:26ch;text-wrap:balance;margin:0 0 20px}
.sec-body{font-size:clamp(1.1rem,1.25vw,1.28rem);line-height:1.55;color:var(--ink-2);font-weight:300;max-width:54ch;margin:0}

/* ---- thesis strip ---- */
.thesis-head{max-width:var(--measure)}
.thesis-blocks{list-style:none;padding:0;margin:clamp(40px,5vw,68px) 0 0;display:grid;grid-template-columns:repeat(4,1fr);gap:clamp(16px,2vw,28px)}
.thesis-blocks li{position:relative;border-top:1px solid var(--line-2);padding-top:16px}
.thesis-blocks li:not(:last-child)::after{content:"→";position:absolute;top:13px;right:0;transform:translateX(calc(50% + clamp(8px,1vw,14px)));font-family:var(--mono);font-size:12px;line-height:1;color:var(--line-2)}
.thesis-blocks .bnum{font-family:var(--mono);font-size:11px;letter-spacing:.14em;color:var(--brand)}
.thesis-blocks h3{font-size:1.2rem;line-height:1.2;margin-top:10px;color:var(--ink)}
@media(max-width:860px){.thesis-blocks{grid-template-columns:1fr 1fr}.thesis-blocks li::after{display:none}}
@media(max-width:560px){.thesis-blocks{grid-template-columns:1fr}.hero-grid,.plate{grid-template-columns:1fr}}

/* ---- core-systems intro + project index ---- */
.core-intro{display:grid;grid-template-columns:var(--split);gap:var(--section-gap);align-items:start}
.proj-index{list-style:none;margin:0;padding:0;border-top:1px solid var(--line)}
.proj-index li{border-bottom:1px solid var(--line)}
.proj-index a{display:flex;align-items:baseline;gap:14px;padding:18px 4px;font-family:var(--display);font-size:1.6rem;transition:color .18s ease,padding .18s ease}
.proj-index a:hover{color:var(--brand);padding-left:10px}
.proj-index .pi{font-family:var(--mono);font-size:11px;letter-spacing:.12em;color:var(--brand)}

/* ---- project plate: points + related + diagram stack ---- */
.points{list-style:none;margin:26px 0 28px;padding:0;display:flex;flex-direction:column;gap:12px}
.points li{position:relative;padding-left:20px;font-size:16px;line-height:1.5;color:var(--ink-2)}
.points li::before{content:"";position:absolute;left:0;top:.56em;width:6px;height:6px;border-radius:50%;background:var(--brand)}
.related{display:flex;flex-wrap:wrap;align-items:center;gap:16px;margin-top:26px;font-family:var(--mono);font-size:10.5px;letter-spacing:.1em;text-transform:uppercase}
.related span{color:var(--muted)}
.related a{color:var(--ink-2);position:relative}.related a:hover{color:var(--brand)}
/* tiny mono tags (replace feature bullets on core-system modules) */
.tags{display:flex;flex-wrap:wrap;gap:8px;margin:24px 0 28px}
.tags span{font-family:var(--mono);font-size:10px;letter-spacing:.1em;text-transform:uppercase;color:var(--ink-2);border:1px solid var(--line-2);border-radius:999px;padding:6px 13px}
.fig-stack{display:flex;flex-direction:column;gap:18px}
.plate > .fig-stack{margin-left:clamp(-50px,-2.5vw,-10px);margin-right:clamp(-130px,-8vw,-40px)}
.plate > .fig-stack .fig.r169{aspect-ratio:16/8;max-height:min(50vh,460px)}
@media(max-width:860px){.core-intro{grid-template-columns:1fr}}

/* ---- plate variants: airy spacing + reversed orientation ---- */
.plate--airy{gap:calc(var(--section-gap) * 1.4)}
.plate.rev{grid-template-columns:minmax(0,1fr) minmax(480px,34rem)}
.plate.rev .copy{order:2;justify-self:end}
.plate.rev > .fig,.plate.rev > .fig-stack{order:1}
@media(max-width:860px){.plate.rev{grid-template-columns:1fr}.plate.rev .copy{order:1;justify-self:start}.plate.rev > .fig,.plate.rev > .fig-stack{order:2}}

/* ---- incubated preview band ---- */
.section--alt{background:var(--paper-2)}
.arenas-cta{margin-top:24px}
.arena-cards{display:grid;grid-template-columns:repeat(3,1fr);gap:18px;margin-top:clamp(36px,4vw,56px)}
/* cards don't levitate — the schematic register acknowledges a hover the way a
   drawing acknowledges a pen: the frame sharpens and the title takes the ink */
.arena-card{border:1px solid var(--line);border-radius:14px;background:var(--paper);padding:0 0 22px;overflow:hidden;transition:border-color .4s var(--ease-draft)}
.arena-card:hover{border-color:var(--line-2)}
.arena-card .fig.r169{aspect-ratio:16/10;margin:0 0 14px;background:var(--fig-bg);border-bottom:1px solid var(--line);max-height:none}
.arena-card h3{font-size:1.42rem;padding:0 22px;transition:color .3s var(--ease-draft)}
.arena-card:hover h3{color:var(--brand)}
.arena-card p{padding:6px 22px 0;color:var(--ink-2);font-size:15.5px;line-height:1.5}

/* ---- origins timeline ---- */
.timeline{list-style:none;padding:0;margin:clamp(40px,5vw,68px) 0 0;display:grid;grid-template-columns:repeat(4,1fr);gap:clamp(18px,2.4vw,34px)}
.timeline li{border-top:2px solid var(--brand);padding-top:16px}
.timeline .ty{font-family:var(--mono);font-size:11px;letter-spacing:.12em;color:var(--brand)}
.timeline h3{font-size:1.36rem;margin-top:8px}
.timeline p{color:var(--ink-2);font-size:15px;line-height:1.5;margin-top:8px}
.origin-note{max-width:48ch;margin-top:clamp(36px,4vw,56px);padding-top:22px;border-top:1px solid var(--line);color:var(--ink-2);font-family:var(--display);font-style:italic;font-size:clamp(1.2rem,1.5vw,1.5rem);line-height:1.4}
@media(max-width:860px){.arena-cards,.timeline{grid-template-columns:1fr 1fr}}
@media(max-width:560px){.arena-cards,.timeline{grid-template-columns:1fr}}

/* left-aligned section lead (research, team) — distinct from centered narrative sections */
.section-inner > .lead{max-width:var(--measure);margin-left:0;margin-right:auto}

/* ---- research publication list ---- */
.pub-list{list-style:none;padding:0;margin:clamp(32px,4vw,52px) 0 0;border-top:1px solid var(--line)}
.pub-list li{border-bottom:1px solid var(--line)}
.pub-list a{display:block;padding:20px 4px;transition:padding .35s var(--ease-draft)}
.pub-list a:hover{padding-left:10px}
.pub-list .pub-status{font-family:var(--mono);font-size:10px;letter-spacing:.12em;text-transform:uppercase;color:var(--muted)}
/* "Soon" stamp — not-yet-live arenas / papers (MicroMarkets, the working paper) */
.soon{display:inline-block;font-family:var(--mono);font-size:9.5px;letter-spacing:.14em;text-transform:uppercase;color:var(--brand);border:1px solid color-mix(in srgb,var(--brand) 30%,transparent);border-radius:999px;padding:2px 7px;margin-left:8px;vertical-align:middle;line-height:1.45}
.pub-list h3{font-size:1.36rem;margin-top:6px;transition:color .18s}
.pub-list a:hover h3{color:var(--brand)}
.pub-list p{color:var(--ink-2);font-size:15px;margin-top:6px;max-width:64ch}

/* ---- team ---- */
.founders-row{display:grid;grid-template-columns:repeat(3,1fr);gap:12px;margin:clamp(36px,4vw,56px) 0 14px}
.founder{border:1px solid var(--line);border-radius:12px;background:var(--paper);padding:22px 24px;transition:border-color .4s var(--ease-draft)}
.founder:hover{border-color:var(--line-2)}
.f-name{font-family:var(--display);font-size:1.6rem;line-height:1.1}
.f-role{font-family:var(--mono);font-size:10.5px;letter-spacing:.13em;text-transform:uppercase;color:var(--brand);margin-top:9px}
.team-grid{list-style:none;margin:0;padding:0;display:grid;grid-template-columns:1fr 1fr 1fr;border:1px solid var(--line);border-radius:12px;background:var(--paper);overflow:hidden}
.tm{display:flex;flex-direction:column;gap:3px;padding:16px 20px;border-bottom:1px solid var(--line);border-right:1px solid var(--line)}
.tm-name{font-family:var(--display);font-size:1.2rem;line-height:1.15}
.tm-role{font-family:var(--mono);font-size:9.5px;letter-spacing:.1em;text-transform:uppercase;color:var(--muted)}
.team-summary{margin:clamp(28px,3vw,40px) 0 26px;font-family:var(--display);font-size:clamp(1.3rem,1.8vw,1.75rem);line-height:1.3;color:var(--ink-2);max-width:42ch}
.team-expand{margin:0}
.team-expand > summary{list-style:none;cursor:pointer;width:max-content}
.team-expand > summary::-webkit-details-marker{display:none}
.team-expand[open] > summary{margin-bottom:22px}
.team-expand .team-grid{margin-top:0}

/* ---- FAQ: full-width two-column grid ---- */
.faq-list{display:grid;grid-template-columns:1fr 1fr;gap:clamp(34px,4vw,56px) clamp(48px,5vw,88px);margin:clamp(40px,4.5vw,64px) 0 0}
.faq-item{margin:0}
.faq-item dt{font-family:var(--display);font-size:clamp(1.3rem,1.6vw,1.6rem);line-height:1.22}
.faq-item dd{margin:12px 0 0;color:var(--ink-2);font-size:16.5px;line-height:1.7;max-width:48ch}

/* ---- definitions accordion: 8 long-form answers collapse to a question
   list (same details/summary device as the team expand) — the full copy
   stays in the DOM for crawlers, the page only spends 8 rows of height ---- */
.defs-acc{margin:clamp(36px,4vw,56px) 0 0;border-top:1px solid var(--line);max-width:900px}
.def{border-bottom:1px solid var(--line)}
.def summary{list-style:none;cursor:pointer;display:flex;align-items:baseline;justify-content:space-between;gap:18px;padding:17px 4px}
.def summary::-webkit-details-marker{display:none}
.def summary h3{font-family:var(--display);font-weight:400;font-size:clamp(1.2rem,1.5vw,1.5rem);line-height:1.25;margin:0;transition:color .3s var(--ease-draft)}
.def summary:hover h3{color:var(--brand)}
.def .def-x{font-family:var(--mono);font-size:15px;line-height:1;color:var(--muted);flex:none;transform-origin:50% 50%;transition:transform .4s var(--ease-draft),color .3s var(--ease-draft)}
.def[open] .def-x{transform:rotate(45deg);color:var(--brand)}
.def .def-body{padding:2px 4px 24px;color:var(--ink-2);font-size:16.5px;line-height:1.7;max-width:66ch}
.def .def-body p{margin:0}
.def .def-body p+p{margin-top:.75em}
.def .def-body strong{font-weight:500;color:var(--ink)}
/* smooth expand where the platform supports it (Chrome 129+); elsewhere it
   snaps open, which is the native details behaviour */
@supports (interpolate-size: allow-keywords){
  .def{interpolate-size:allow-keywords}
  .def::details-content{height:0;overflow:clip;transition:height .5s var(--ease-draft),content-visibility .5s var(--ease-draft) allow-discrete}
  .def[open]::details-content{height:auto}
}
@media(max-width:760px){.faq-list,.faq-list.defs{grid-template-columns:1fr;gap:30px}}

/* ---- final CTA with faint background tree ---- */
.section--cta{overflow:hidden}
.section--cta .cta-inner{position:relative;z-index:2}
.section--cta .sec-title{max-width:17ch}
.section--cta .sec-body{max-width:48ch}
.cta-buttons{justify-content:flex-start;margin-top:30px}
.fig-bg-tree{position:absolute;inset:0;z-index:0;opacity:.11;pointer-events:none;-webkit-mask-image:radial-gradient(110% 95% at 80% 50%,#000 16%,transparent 78%);mask-image:radial-gradient(110% 95% at 80% 50%,#000 16%,transparent 78%)}
.fig-bg-tree iframe{width:100%;height:100%;border:0}

/* ---- footer ---- */
.foot{border-top:1px solid var(--line-2);background:var(--paper-2);scroll-snap-align:start}
.foot-inner{max-width:var(--maxw);margin:0 auto;padding:clamp(48px,6vw,80px) var(--gutter);display:grid;grid-template-columns:minmax(0,1.3fr) minmax(0,2fr);gap:clamp(36px,5vw,72px)}
.foot-tag{font-family:var(--display);font-size:1.28rem;margin-top:14px}
.foot-desc{color:var(--muted);font-size:14px;line-height:1.7;margin-top:12px;max-width:42ch}
.foot-cols{display:grid;grid-template-columns:repeat(4,1fr);gap:24px}
.foot-cols h4{font-family:var(--mono);font-size:10px;letter-spacing:.12em;text-transform:uppercase;color:var(--muted);margin:0 0 12px;font-weight:400}
.foot-cols a{display:block;font-size:15px;color:var(--ink-2);padding:5px 0}.foot-cols a:hover{color:var(--brand)}
@media(max-width:860px){.team-grid{grid-template-columns:1fr 1fr}.founders-row{grid-template-columns:1fr}.foot-inner{grid-template-columns:1fr}.foot-cols{grid-template-columns:1fr 1fr}}
@media(max-width:560px){.team-grid{grid-template-columns:1fr}}

/* ============ responsive ============ */
/* stack two-column layouts well before the columns get cramped, and neutralise
   the desktop diagram-overlap negative margins so nothing bleeds off-screen */
@media(max-width:900px){
  /* drop magnetic snap on small screens — stacked content exceeds the viewport */
  html{scroll-snap-type:none}
  .section{min-height:0;display:block;scroll-snap-align:none}
  .foot{scroll-snap-align:none}
  .hero-grid,.plate,.core-intro{grid-template-columns:1fr;gap:clamp(28px,5vw,44px);align-items:start}
  .plate > .fig.r169,.plate > .fig-stack,.hero-visual .fig.r169{margin-left:0;margin-right:0;max-height:none}
  .plate > .fig.r169{aspect-ratio:16/10}
  .copy,.hero-copy{max-width:none}
  .section-inner > .lead{max-width:none}
  .section-inner{padding-left:var(--gutter);padding-right:var(--gutter)}
  .sec-title{max-width:24ch}
}
@media(max-width:560px){
  .hero-title{font-size:clamp(2.5rem,11vw,3.2rem)}
  .section-inner{padding-top:clamp(56px,11vw,72px);padding-bottom:clamp(56px,11vw,72px)}
  .hero .section-inner{padding-top:clamp(96px,24vw,128px)}
}

/* hide the rail on narrow viewports (chrome falls back to nav links) */
@media(max-width:980px){.rail,.rail-thread{display:none}}
@media(max-width:680px){.nav-links a:not(.btn){display:none}}

/* reduced motion: the climb already falls back to a readable stack (html.pin is
   never set), but hovers/staggers here and in scroll.css must also go still */
@media(prefers-reduced-motion:reduce){
  html{scroll-behavior:auto}
  *,*::before,*::after{transition-duration:.01ms!important;animation-duration:.01ms!important;animation-delay:0s!important}
}