/* ==========================================================================
   OrionFlow — AI for Hardware Engineering
   One monochrome system for every page: white canvas, black ink, gray rules.
   ========================================================================== */
:root{
  --bg:#FFFFFF;
  --canvas:#F4F4F3;        /* light-gray engineering canvas */
  --ink:#0A0A0A;
  --ink-2:#3D3D3D;
  --muted:#7A7A7A;
  --faint:#ABABAB;
  --line:#E7E7E5;
  --line-2:#D2D2CF;
  --night:#0A0A0A;         /* inverted bands */
  --night-2:#161616;
  --night-line:#2A2A2A;

  --sans:"Geist","Inter",system-ui,-apple-system,"Segoe UI",sans-serif;
  --mono:"Geist Mono",ui-monospace,"SFMono-Regular",Menlo,monospace;

  --wrap:1240px;
  --gut:24px;
  --nav-h:64px;
  --ease:cubic-bezier(.2,.7,.1,1);
}
@media (max-width:640px){ :root{ --gut:16px; } }

*,*::before,*::after{box-sizing:border-box;}
[hidden]{display:none!important;}
html{background:var(--bg);scroll-behavior:smooth;scroll-padding-top:calc(var(--nav-h) + 8px);
  -webkit-text-size-adjust:100%;}
body{margin:0;background:var(--bg);color:var(--ink);font-family:var(--sans);
  font-size:16px;line-height:1.6;-webkit-font-smoothing:antialiased;text-rendering:optimizeLegibility;
  overflow-x:hidden;}
a{color:inherit;text-decoration:none;}
img,svg,canvas{display:block;max-width:100%;}
button,input,textarea,select{font:inherit;color:inherit;}
::selection{background:var(--ink);color:#fff;}
:focus-visible{outline:1.5px solid var(--ink);outline-offset:3px;}

.wrap{max-width:var(--wrap);margin:0 auto;padding:0 var(--gut);}
.mono{font-family:var(--mono);}
.label{font-family:var(--mono);font-size:11px;font-weight:500;letter-spacing:.14em;
  text-transform:uppercase;color:var(--muted);}
.label b{color:var(--ink);font-weight:500;}
.skip{position:absolute;left:-999px;top:8px;background:var(--ink);color:#fff;padding:8px 12px;z-index:100;}
.skip:focus{left:8px;}

/* ---- buttons ------------------------------------------------------------ */
.btn{display:inline-flex;align-items:center;gap:10px;height:44px;padding:0 20px;
  font-family:var(--mono);font-size:12px;font-weight:500;letter-spacing:.12em;text-transform:uppercase;
  background:var(--ink);color:#fff;border:1px solid var(--ink);border-radius:0;cursor:pointer;
  transition:background .2s var(--ease),color .2s var(--ease),border-color .2s var(--ease);white-space:nowrap;}
.btn:hover{background:#2A2A2A;border-color:#2A2A2A;}
.btn .arr{transition:transform .25s var(--ease);}
.btn:hover .arr{transform:translateX(3px);}
.btn--ghost{background:transparent;color:var(--ink);border-color:var(--line-2);}
.btn--ghost:hover{background:transparent;border-color:var(--ink);}
.btn--sm{height:36px;padding:0 14px;font-size:11px;}
.btn--inv{background:#fff;color:var(--ink);border-color:#fff;}
.btn--inv:hover{background:#E6E6E6;border-color:#E6E6E6;}
.btn[disabled]{opacity:.55;cursor:progress;}
.link{font-family:var(--mono);font-size:12px;letter-spacing:.12em;text-transform:uppercase;
  border-bottom:1px solid var(--line-2);padding-bottom:3px;transition:border-color .2s;}
.link:hover{border-color:var(--ink);}

/* ---- navigation --------------------------------------------------------- */
.nav{position:fixed;inset:0 0 auto 0;height:var(--nav-h);z-index:50;
  background:rgba(255,255,255,.86);-webkit-backdrop-filter:saturate(1.4) blur(10px);backdrop-filter:saturate(1.4) blur(10px);
  border-bottom:1px solid transparent;transition:border-color .25s;}
.nav.is-scrolled,.nav--solid{border-bottom-color:var(--line);}
.nav__in{height:100%;display:flex;align-items:center;gap:40px;}
.brand{display:inline-flex;align-items:center;gap:10px;font-weight:600;font-size:16px;letter-spacing:-.01em;}
.brand img{width:24px;height:24px;flex:none;}
.nav__links{display:flex;gap:28px;}
.nav__links a{font-size:14px;color:var(--ink-2);transition:color .15s;}
.nav__links a:hover,.nav__links a[aria-current="page"]{color:var(--ink);}
.nav__right{margin-left:auto;display:flex;align-items:center;gap:20px;}
.nav__signin{font-size:14px;color:var(--ink-2);}
.nav__signin:hover{color:var(--ink);}
.nav__menu{display:none;width:40px;height:40px;border:1px solid var(--line-2);background:transparent;
  cursor:pointer;align-items:center;justify-content:center;}
.nav__menu span{display:block;width:16px;height:1px;background:var(--ink);position:relative;}
.nav__menu span::before,.nav__menu span::after{content:"";position:absolute;left:0;width:16px;height:1px;background:var(--ink);transition:transform .2s;}
.nav__menu span::before{top:-5px;} .nav__menu span::after{top:5px;}
.nav.is-open .nav__menu span{background:transparent;}
.nav.is-open .nav__menu span::before{transform:translateY(5px) rotate(45deg);}
.nav.is-open .nav__menu span::after{transform:translateY(-5px) rotate(-45deg);}
.sheet-menu{display:none;}
@media (max-width:820px){
  .nav__links,.nav__signin{display:none;}
  .nav__menu{display:inline-flex;}
  .nav__right .btn{display:none;}
  .nav.is-open{background:#fff;border-bottom-color:var(--line);}
  .sheet-menu{display:block;position:fixed;top:var(--nav-h);left:0;right:0;background:#fff;
    border-bottom:1px solid var(--line);padding:8px var(--gut) 20px;z-index:49;}
  .sheet-menu[hidden]{display:none!important;}
  .sheet-menu a{display:block;padding:14px 0;border-bottom:1px solid var(--line);font-size:18px;}
  .sheet-menu .btn{margin-top:18px;width:100%;justify-content:center;}
}

/* ---- sections ------------------------------------------------------------ */
section{position:relative;}
.sec{padding:128px 0;}
.sec--canvas{background:var(--canvas);}
.sec--night{background:var(--night);color:#fff;}
.sec--night .label{color:#8C8C8C;}
@media (max-width:820px){ .sec{padding:88px 0;} }
.sec__head{display:grid;grid-template-columns:200px 1fr;gap:32px;margin-bottom:64px;align-items:start;}
.sec__head h2{margin:0;font-size:clamp(32px,4.6vw,60px);line-height:1.02;letter-spacing:-.035em;font-weight:500;max-width:16ch;}
.sec__head p{margin:20px 0 0;max-width:52ch;color:var(--ink-2);font-size:18px;}
.sec--night .sec__head p{color:#A6A6A6;}
.sec__num{padding-top:10px;}
@media (max-width:820px){ .sec__head{grid-template-columns:1fr;gap:16px;margin-bottom:44px;} .sec__num{padding-top:0;} }

/* reveal on scroll */
.rv{opacity:0;transform:translateY(14px);transition:opacity .8s var(--ease),transform .8s var(--ease);}
.rv.in{opacity:1;transform:none;}
@media (prefers-reduced-motion:reduce){ .rv{opacity:1;transform:none;transition:none;} html{scroll-behavior:auto;} }

/* ---- hero ----------------------------------------------------------------- */
.hero{padding-top:var(--nav-h);min-height:min(100vh,940px);display:flex;flex-direction:column;
  border-bottom:1px solid var(--line);overflow:hidden;}
.hero__grid{flex:1;display:grid;grid-template-columns:minmax(0,5fr) minmax(0,7fr);gap:0;}
.hero__copy{display:flex;flex-direction:column;justify-content:center;padding:72px 0 56px;position:relative;z-index:2;}
.hero h1{margin:22px 0 0;font-size:clamp(46px,7vw,104px);line-height:.94;letter-spacing:-.05em;font-weight:500;}
.hero h1 .soft{color:var(--faint);}
.hero__sub{margin:28px 0 0;max-width:30ch;font-size:clamp(18px,1.6vw,21px);line-height:1.45;color:var(--ink-2);}
.hero__sub b{color:var(--ink);font-weight:500;}
.hero__cta{margin-top:40px;display:flex;flex-wrap:wrap;gap:12px;}
.hero__stage{position:relative;min-height:520px;margin-right:calc(-1 * var(--gut));}
.hero__stage canvas{position:absolute;inset:0;width:100%;height:100%;cursor:grab;touch-action:pan-y;}
.hero__stage canvas:active{cursor:grabbing;}
.stage__hud{position:absolute;pointer-events:none;font-family:var(--mono);font-size:11px;letter-spacing:.08em;
  color:var(--muted);text-transform:uppercase;line-height:1.7;}
.stage__hud b{color:var(--ink);font-weight:500;}
.hud--tl{top:32px;left:24px;} .hud--tr{top:32px;right:calc(var(--gut) + 8px);text-align:right;}
.hud--bl{bottom:28px;left:24px;}
.stage__tabs{position:absolute;bottom:22px;right:calc(var(--gut) + 8px);display:flex;gap:2px;}
.stage__tabs button{pointer-events:auto;background:transparent;border:0;border-top:1px solid var(--line-2);
  padding:10px 0 0;margin-left:14px;font-family:var(--mono);font-size:11px;letter-spacing:.08em;
  text-transform:uppercase;color:var(--faint);cursor:pointer;min-width:64px;text-align:left;position:relative;white-space:nowrap;}
.stage__tabs button::before{content:"";position:absolute;left:0;top:-1px;height:1px;width:0;background:var(--ink);}
.stage__tabs button.on{color:var(--ink);}
.stage__tabs button.on::before{animation:tabfill var(--hold,6s) linear forwards;}
.stage__tabs.static button.on::before{animation:none;width:100%;}
@keyframes tabfill{from{width:0}to{width:100%}}
.hero__foot{border-top:1px solid var(--line);}
.hero__foot .wrap{display:grid;grid-template-columns:repeat(4,1fr);}
.hero__foot span{padding:16px 0;font-family:var(--mono);font-size:11px;letter-spacing:.12em;text-transform:uppercase;color:var(--muted);}
.hero__foot span b{color:var(--ink);font-weight:500;margin-right:8px;}
@media (max-width:1000px){
  .hero{min-height:0;}
  .hero__grid{grid-template-columns:1fr;}
  .hero__copy{padding:56px 0 8px;}
  .hero__stage{min-height:0;height:min(92vw,560px);margin:0 calc(-1 * var(--gut));}
  .hud--tl{left:var(--gut);top:16px;} .hud--tr{display:none;} .hud--bl{display:none;}
  .stage__tabs{left:var(--gut);right:var(--gut);bottom:14px;justify-content:space-between;}
  .stage__tabs button{margin-left:0;min-width:0;flex:1;margin-right:8px;font-size:10px;letter-spacing:.04em;}
  .stage__tabs button:last-child{margin-right:0;}
  .hero__foot .wrap{grid-template-columns:repeat(2,1fr);}
}

/* ---- pipeline (02) ------------------------------------------------------- */
.story{display:grid;grid-template-columns:repeat(4,1fr);border-top:1px solid var(--line-2);margin-bottom:56px;}
.story li{list-style:none;padding:16px 16px 0 0;font-family:var(--mono);font-size:11px;letter-spacing:.14em;text-transform:uppercase;color:var(--muted);}
.story li b{display:block;color:var(--ink);font-weight:500;margin-bottom:4px;}
.story{padding:0;margin-top:0;}
.pipe{display:grid;grid-template-columns:1.15fr 56px 1fr 56px 1.15fr 56px 1fr;align-items:stretch;}
.pipe__node{background:var(--bg);border:1px solid var(--line-2);padding:22px 22px 24px;min-height:230px;display:flex;flex-direction:column;}
.pipe__node h3{margin:14px 0 18px;font-size:19px;letter-spacing:-.02em;font-weight:500;line-height:1.2;}
.pipe__node ul{margin:auto 0 0;padding:0;list-style:none;}
.pipe__node li{font-family:var(--mono);font-size:12px;letter-spacing:.06em;padding:7px 0;border-top:1px solid var(--line);
  display:flex;justify-content:space-between;color:var(--ink-2);}
.pipe__node li i{font-style:normal;color:var(--faint);}
.pipe__node--engine{background:var(--ink);color:#fff;border-color:var(--ink);}
.pipe__node--engine .label{color:#8C8C8C;}
.pipe__node--engine li{border-color:#2A2A2A;color:#D6D6D6;}
.engine-core{margin:auto 0 18px;height:72px;position:relative;}
.engine-core svg{width:100%;height:100%;}
.pipe__wire{position:relative;display:flex;align-items:center;}
.pipe__wire::before{content:"";position:absolute;left:0;right:0;top:50%;height:1px;background:var(--line-2);}
.pipe__wire i{position:absolute;top:calc(50% - 2px);left:0;width:5px;height:5px;background:var(--ink);
  animation:pulse 2.4s var(--ease) infinite;}
.pipe__wire:nth-of-type(4) i{animation-delay:.8s;} .pipe__wire:nth-of-type(6) i{animation-delay:1.6s;}
@keyframes pulse{0%{left:0;opacity:0}15%{opacity:1}85%{opacity:1}100%{left:calc(100% - 5px);opacity:0}}
@media (prefers-reduced-motion:reduce){ .pipe__wire i{animation:none;left:calc(50% - 2px);} }
@media (max-width:1000px){
  .story{grid-template-columns:repeat(2,1fr);row-gap:16px;}
  .pipe{grid-template-columns:1fr;}
  .pipe__node{min-height:0;}
  .pipe__wire{height:40px;justify-content:center;}
  .pipe__wire::before{left:50%;right:auto;top:0;bottom:0;width:1px;height:auto;}
  .pipe__wire i{left:calc(50% - 2px);animation-name:pulsev;}
}
@keyframes pulsev{0%{top:0;opacity:0}15%{opacity:1}85%{opacity:1}100%{top:calc(100% - 5px);opacity:0}}

/* ---- product (03) -------------------------------------------------------- */
.prod{display:grid;grid-template-columns:repeat(2,1fr);border-top:1px solid var(--line-2);border-left:1px solid var(--line-2);}
.prod__card{border-right:1px solid var(--line-2);border-bottom:1px solid var(--line-2);padding:32px 32px 36px;
  display:grid;grid-template-columns:1fr 200px;gap:24px;min-height:340px;position:relative;transition:background .3s var(--ease);}
.prod__card:hover{background:#FAFAF9;}
.prod__card h3{margin:16px 0 12px;font-size:26px;letter-spacing:-.03em;font-weight:500;line-height:1.1;}
.prod__card p{margin:0;color:var(--ink-2);max-width:34ch;}
.prod__card ul{margin:28px 0 0;padding:0;list-style:none;}
.prod__card li{font-family:var(--mono);font-size:12px;letter-spacing:.04em;color:var(--ink-2);padding:6px 0 6px 18px;position:relative;}
.prod__card li::before{content:"";position:absolute;left:0;top:13px;width:8px;height:1px;background:var(--ink);}
.prod__fig{align-self:center;color:var(--ink);}
.prod__fig svg{width:100%;height:auto;overflow:visible;}
.prod__fig .dr{stroke-dasharray:var(--len,600);stroke-dashoffset:var(--len,600);transition:stroke-dashoffset 1.8s var(--ease);}
.prod__card.in .prod__fig .dr{stroke-dashoffset:0;}
.prod__fig .ghost{stroke:var(--line-2);}
.prod__fig text{font-family:var(--mono);font-size:9px;fill:var(--muted);letter-spacing:.04em;}
@media (prefers-reduced-motion:reduce){ .prod__fig .dr{stroke-dashoffset:0;transition:none;} }
@media (max-width:1000px){ .prod{grid-template-columns:1fr;} }
@media (max-width:560px){ .prod__card{grid-template-columns:1fr;padding:28px 20px;min-height:0;} .prod__fig{max-width:220px;} }
.prod__foot{margin-top:40px;display:flex;flex-wrap:wrap;align-items:center;gap:24px;justify-content:space-between;}
.prod__foot p{margin:0;color:var(--ink-2);max-width:60ch;}

/* ---- industries (04) ----------------------------------------------------- */
.ind{border-top:1px solid var(--night-line);}
.ind__row{display:grid;grid-template-columns:80px minmax(0,1.2fr) minmax(0,1.4fr) minmax(0,1fr);gap:24px;align-items:baseline;
  padding:34px 0;border-bottom:1px solid var(--night-line);transition:padding .35s var(--ease);}
.ind__row:hover{padding-left:12px;}
.ind__row h3{margin:0;font-size:clamp(24px,2.6vw,34px);letter-spacing:-.03em;font-weight:500;line-height:1.1;}
.ind__row p{margin:0;color:#A6A6A6;}
.ind__tags{display:flex;flex-wrap:wrap;gap:6px;justify-content:flex-end;}
.ind__tags span{font-family:var(--mono);font-size:11px;letter-spacing:.08em;text-transform:uppercase;color:#CFCFCF;
  border:1px solid var(--night-line);padding:4px 8px;}
@media (max-width:900px){
  .ind__row{grid-template-columns:48px 1fr;row-gap:12px;}
  .ind__row p,.ind__tags{grid-column:2;}
  .ind__tags{justify-content:flex-start;}
}

/* ---- research (05) ------------------------------------------------------- */
.res{display:grid;grid-template-columns:repeat(4,1fr);border-top:1px solid var(--line-2);}
.res__area{padding:28px 24px 32px 0;border-right:1px solid var(--line);display:flex;flex-direction:column;}
.res__area + .res__area{padding-left:24px;}
.res__area:last-child{border-right:0;}
.res__area h3{margin:14px 0 12px;font-size:22px;letter-spacing:-.025em;font-weight:500;line-height:1.15;}
.res__area > p{margin:0 0 24px;color:var(--ink-2);font-size:15px;}
.res__fig{height:120px;margin:0 0 24px;border:1px solid var(--line);background:var(--bg);}
.res__fig svg{width:100%;height:100%;}
.res__posts{margin-top:auto;border-top:1px solid var(--line);}
.res__posts a{display:flex;justify-content:space-between;gap:12px;padding:12px 0;border-bottom:1px solid var(--line);font-size:14px;line-height:1.4;}
.res__posts a span:last-child{font-family:var(--mono);color:var(--muted);transition:transform .2s var(--ease),color .2s;}
.res__posts a:hover span:last-child{transform:translate(2px,-2px);color:var(--ink);}
@media (max-width:1000px){
  .res{grid-template-columns:repeat(2,1fr);}
  .res__area,.res__area + .res__area{padding:28px 20px 32px 0;border-right:0;}
  .res__area:nth-child(odd){border-right:1px solid var(--line);}
  .res__area:nth-child(even){padding-left:20px;}
  .res__area:nth-child(n+3){border-top:1px solid var(--line);}
}
@media (max-width:600px){
  .res{grid-template-columns:1fr;}
  .res__area,.res__area:nth-child(even){padding:28px 0 32px;border-right:0!important;}
  .res__area + .res__area{border-top:1px solid var(--line);}
}

/* ---- final CTA (06) ------------------------------------------------------ */
.cta{padding:160px 0 150px;background:var(--canvas);border-top:1px solid var(--line);overflow:hidden;}
.cta h2{margin:22px 0 0;font-size:clamp(44px,8vw,128px);line-height:.92;letter-spacing:-.055em;font-weight:500;max-width:12ch;}
.cta__row{margin-top:48px;display:flex;flex-wrap:wrap;gap:12px;align-items:center;}
.cta__grid{position:absolute;inset:0;pointer-events:none;opacity:.6;
  background-image:linear-gradient(var(--line) 1px,transparent 1px),linear-gradient(90deg,var(--line) 1px,transparent 1px);
  background-size:64px 64px;-webkit-mask-image:linear-gradient(90deg,transparent 30%,#000 100%);mask-image:linear-gradient(90deg,transparent 30%,#000 100%);}
.cta .wrap{position:relative;}
@media (max-width:820px){ .cta{padding:110px 0 100px;} }

/* ---- footer -------------------------------------------------------------- */
.foot{border-top:1px solid var(--line);padding:56px 0 32px;font-size:14px;}
.foot__top{display:flex;flex-wrap:wrap;justify-content:space-between;gap:32px;}
.foot__top p{margin:8px 0 0;color:var(--muted);}
.foot__links{display:flex;flex-wrap:wrap;gap:8px 28px;align-items:flex-start;}
.foot__links a{color:var(--ink-2);} .foot__links a:hover{color:var(--ink);}
.foot__bot{margin-top:56px;display:flex;flex-wrap:wrap;justify-content:space-between;gap:12px;
  font-family:var(--mono);font-size:11px;letter-spacing:.1em;text-transform:uppercase;color:var(--muted);}
.foot__bot a:hover{color:var(--ink);}

/* ---- demo dialog --------------------------------------------------------- */
.demo{border:0;padding:0;margin:auto;width:min(1000px,calc(100vw - 24px));height:min(860px,calc(100dvh - 24px));max-height:none;
  background:var(--bg);color:var(--ink);box-shadow:0 30px 80px rgba(0,0,0,.18);overflow:hidden;}
.demo[open]{display:flex;flex-direction:column;animation:dlg .35s var(--ease);}
.demo::backdrop{background:rgba(10,10,10,.42);-webkit-backdrop-filter:blur(3px);backdrop-filter:blur(3px);}
@keyframes dlg{from{opacity:0;transform:translateY(10px)}to{opacity:1;transform:none}}
.demo__head{display:flex;justify-content:space-between;align-items:flex-start;padding:22px 28px 18px;gap:16px;border-bottom:1px solid var(--line);}
.demo__head h2{margin:8px 0 0;font-size:28px;letter-spacing:-.035em;font-weight:500;line-height:1.05;}
.demo__head p{margin:6px 0 0;color:var(--ink-2);font-size:15px;max-width:56ch;}
.demo__x{width:36px;height:36px;flex:none;border:1px solid var(--line-2);background:transparent;cursor:pointer;font-size:18px;line-height:1;}
.demo__x:hover{border-color:var(--ink);}
.demo__cal{position:relative;flex:1;min-height:0;}
.demo__cal iframe{position:absolute;inset:0;width:100%;height:100%;border:0;background:#fff;opacity:0;transition:opacity .3s;}
.demo.is-loaded .demo__cal iframe{opacity:1;}
.demo__load{position:absolute;inset:0;display:flex;align-items:center;justify-content:center;
  font-family:var(--mono);font-size:12px;letter-spacing:.1em;text-transform:uppercase;color:var(--muted);}
.demo__foot{display:flex;flex-wrap:wrap;gap:10px 20px;align-items:center;justify-content:space-between;padding:14px 28px;border-top:1px solid var(--line);}
.demo__foot p{margin:0;font-size:13px;color:var(--muted);}
@media (max-width:600px){
  .demo{width:100vw;height:100dvh;max-width:100vw;max-height:100dvh;}
  .demo__head,.demo__foot{padding-left:16px;padding-right:16px;}
  .demo__head h2{font-size:22px;} .demo__head p{display:none;}
}
.spin{display:inline-block;width:12px;height:12px;border:1.5px solid currentColor;border-right-color:transparent;border-radius:50%;
  animation:sp .7s linear infinite;}
@keyframes sp{to{transform:rotate(360deg)}}

/* ---- inner pages: legal + research -------------------------------------- */
.page{padding:calc(var(--nav-h) + 72px) 0 96px;}
.page__head{border-bottom:1px solid var(--line-2);padding-bottom:40px;margin-bottom:56px;}
.page__head h1{margin:18px 0 0;font-size:clamp(40px,6vw,80px);line-height:.98;letter-spacing:-.045em;font-weight:500;max-width:18ch;}
.page__head p{margin:20px 0 0;color:var(--ink-2);font-size:19px;max-width:56ch;}
.doc{display:grid;grid-template-columns:200px minmax(0,680px);gap:48px;}
.doc__aside{position:sticky;top:calc(var(--nav-h) + 32px);align-self:start;}
.doc__aside a{display:block;padding:5px 0;font-size:13px;color:var(--muted);}
.doc__aside a:hover{color:var(--ink);}
@media (max-width:900px){ .doc{grid-template-columns:1fr;} .doc__aside{display:none;} }

.prose{font-size:17px;line-height:1.72;color:var(--ink-2);}
.prose h2{color:var(--ink);font-size:24px;letter-spacing:-.025em;font-weight:500;line-height:1.2;margin:52px 0 14px;}
.prose h2:first-child{margin-top:0;}
.prose h3{color:var(--ink);font-size:18px;font-weight:500;margin:32px 0 8px;}
.prose p{margin:0 0 18px;}
.prose ul,.prose ol{margin:0 0 20px;padding-left:20px;}
.prose li{margin:6px 0;}
.prose li::marker{color:var(--faint);}
.prose strong{color:var(--ink);font-weight:600;}
.prose a{color:var(--ink);border-bottom:1px solid var(--line-2);transition:border-color .15s;}
.prose a:hover{border-color:var(--ink);}
.prose code{font-family:var(--mono);font-size:.86em;background:var(--canvas);padding:1px 5px;}
.prose pre{background:var(--night);color:#E8E8E8;padding:20px 22px;overflow-x:auto;margin:28px 0;font-size:13px;line-height:1.65;}
.prose pre code{background:none;padding:0;color:inherit;font-size:inherit;}
.prose hr{border:0;border-top:1px solid var(--line);margin:44px 0;}
.prose blockquote{margin:28px 0;padding:4px 0 4px 20px;border-left:2px solid var(--ink);color:var(--ink);font-size:19px;letter-spacing:-.01em;}
.prose table{width:100%;border-collapse:collapse;margin:20px 0 28px;font-size:15px;}
.prose th,.prose td{text-align:left;padding:10px 12px 10px 0;border-bottom:1px solid var(--line);vertical-align:top;}
.prose th{font-family:var(--mono);font-size:11px;letter-spacing:.12em;text-transform:uppercase;color:var(--muted);font-weight:500;}
.callout{border:1px solid var(--line-2);padding:20px 22px;margin:28px 0;background:var(--bg);}
.callout .k{display:block;font-family:var(--mono);font-size:11px;letter-spacing:.14em;text-transform:uppercase;color:var(--ink);margin-bottom:8px;}
.callout p{margin:0;}
.notice{background:var(--canvas);border-left:2px solid var(--ink);padding:16px 20px;margin:0 0 32px;color:var(--ink);}

/* research article */
.art{padding:calc(var(--nav-h) + 72px) 0 0;}
.art__in{max-width:760px;margin:0 auto;padding:0 var(--gut);}
.art h1{margin:18px 0 0;font-size:clamp(36px,5.2vw,64px);line-height:1;letter-spacing:-.045em;font-weight:500;}
.art__lead{margin:24px 0 0;font-size:20px;line-height:1.5;color:var(--ink-2);}
.art__meta{display:flex;flex-wrap:wrap;gap:8px 20px;margin:32px 0 0;padding:14px 0;border-top:1px solid var(--line-2);border-bottom:1px solid var(--line);}
.art__body{max-width:760px;margin:48px auto 0;padding:0 var(--gut) 96px;}
.backlink{display:inline-block;margin-top:40px;font-family:var(--mono);font-size:12px;letter-spacing:.12em;text-transform:uppercase;color:var(--muted);}
.backlink:hover{color:var(--ink);}

/* research index */
.rgroup{display:grid;grid-template-columns:260px 1fr;gap:32px;padding:40px 0;border-top:1px solid var(--line-2);}
.page__head + .rgroup{border-top:0;padding-top:0;}
.rgroup h2{margin:12px 0 8px;font-size:24px;letter-spacing:-.025em;font-weight:500;}
.rgroup > div > p{margin:0;color:var(--muted);font-size:14px;max-width:30ch;}
.rlist{margin:0;padding:0;list-style:none;}
.rlist li + li{border-top:1px solid var(--line);}
.rlist a{display:grid;grid-template-columns:1fr auto;gap:8px 24px;padding:18px 0;}
.rlist a strong{font-size:20px;font-weight:500;letter-spacing:-.02em;line-height:1.25;}
.rlist a p{grid-column:1;margin:0;color:var(--ink-2);font-size:15px;max-width:62ch;}
.rlist a > span{grid-row:1 / span 2;grid-column:2;align-self:center;font-family:var(--mono);color:var(--muted);transition:transform .2s var(--ease),color .2s;}
.rlist a:hover > span{transform:translate(3px,-3px);color:var(--ink);}
.rlist a:hover strong{text-decoration:underline;text-underline-offset:4px;text-decoration-thickness:1px;}
.rlist .soon{padding:18px 0;color:var(--muted);font-size:15px;}
@media (max-width:820px){ .rgroup{grid-template-columns:1fr;gap:12px;} }