/* Research-lab plainness: black page, one compact grotesque, small mono labels, hairlines. The particle field carries the spectacle. */
:root{
  --bg:#000; --ink:#fff; --text:#ffffffbb; --dim:#888; --faint:#666; --rule:#ffffff24; --warm:#ffb07a;
  --sans:'Geist','Helvetica Neue',Helvetica,Arial,sans-serif;
  --mono:'Geist Mono',ui-monospace,SFMono-Regular,Menlo,Consolas,monospace;
  --gutter:clamp(20px,4.4vw,64px);
  color-scheme:dark;
}
*{box-sizing:border-box}
html{scroll-behavior:smooth}
body{margin:0;background:var(--bg);color:var(--text);font:400 16px/1.7 var(--sans);-webkit-font-smoothing:antialiased;overflow-x:hidden}
@media (min-width:1200px){body{font-size:17px}}
@media (min-width:1700px){body{font-size:18px}}
h1,h2,p,dl,dd{margin:0}
a{color:inherit;text-decoration:none}
a:focus-visible,button:focus-visible,[tabindex]:focus-visible{outline:1px solid var(--ink);outline-offset:5px}
::selection{background:var(--ink);color:var(--bg)}

.layer{position:fixed;inset:0;width:100%;height:100%;display:block;pointer-events:none}
#rain{z-index:0}
#field{z-index:1}

.bar{position:fixed;top:0;left:0;right:0;z-index:5;display:flex;align-items:center;justify-content:space-between;gap:20px;height:60px;
  padding:0 max(var(--gutter),env(safe-area-inset-right,0px)) 0 max(var(--gutter),env(safe-area-inset-left,0px));
  border-bottom:1px solid var(--rule);background:color-mix(in srgb,var(--bg) 72%,transparent);backdrop-filter:blur(10px);-webkit-backdrop-filter:blur(10px)}
.mark{font:500 17px/1 var(--sans);letter-spacing:-.01em;color:var(--ink)}
.bar nav{display:flex;gap:28px}
.bar nav a,.label,.facts dt,.hint,.small,.foot span{font:400 12px/1.5 var(--mono);text-transform:uppercase;letter-spacing:.04em;color:var(--dim)}
.bar nav a:hover{color:var(--ink)}

main{position:relative;z-index:2}
.ch{min-height:100vh;min-height:100svh;display:grid;align-items:center;
  padding:120px max(var(--gutter),env(safe-area-inset-right,0px)) 100px max(var(--gutter),env(safe-area-inset-left,0px))}
.copy{position:relative;width:100%;max-width:45ch;min-width:0}
.ch.right .copy{justify-self:end}

.label{margin-bottom:22px}
h1,h2{font:500 clamp(26px,2.35vw,36px)/1.22 var(--sans);letter-spacing:-.012em;color:var(--ink);text-wrap:balance}
h1{font-size:clamp(28px,2.7vw,42px);line-height:1.18;max-width:20ch}
.lede,.copy>h2+p{margin-top:20px}
.copy>.hint{margin-top:34px;display:flex;align-items:center;gap:10px}
.hint::before{content:"";width:6px;height:6px;background:var(--warm);flex:0 0 6px}
.hint .coarse{display:none}
@media (pointer:coarse){.hint .fine{display:none}.hint .coarse{display:inline}}

.facts{margin-top:34px}
.facts div{display:grid;grid-template-columns:7.5rem 1fr;gap:1rem;padding:14px 0;border-top:1px solid var(--rule)}
.facts div:last-child{border-bottom:1px solid var(--rule)}
.facts dt{padding-top:3px}
.facts dd{font-size:.94em;line-height:1.6}

.areas{display:grid;margin-top:32px}
.areas button{appearance:none;background:none;border:0;border-top:1px solid var(--rule);color:var(--dim);cursor:pointer;text-align:left;
  font:400 1em/1.4 var(--sans);padding:13px 0;display:flex;align-items:center;justify-content:space-between;gap:12px;transition:color .15s}
.areas button::after{content:"";width:6px;height:6px;background:var(--warm);opacity:0;transition:opacity .15s}
.areas button:hover{color:var(--ink)}
.areas button[aria-selected="true"]{color:var(--ink)}
.areas button[aria-selected="true"]::after{opacity:1}
.area-note{border-top:1px solid var(--rule);padding-top:16px;min-height:5.2em;font-size:.94em;line-height:1.6}
.copy>.small{margin-top:10px;color:var(--faint)}

.figure{margin-top:34px;padding:16px 0;border-block:1px solid var(--rule);display:grid;grid-template-columns:auto 1fr;gap:24px;align-items:center}
.figure strong{font:500 clamp(26px,2.35vw,36px)/1 var(--sans);letter-spacing:-.012em;color:var(--ink);font-variant-numeric:tabular-nums;white-space:nowrap}
.figure span{font-size:.88em;line-height:1.55}

.foot{position:relative;z-index:2;display:flex;flex-wrap:wrap;align-items:center;justify-content:space-between;gap:12px 30px;
  padding:22px max(var(--gutter),env(safe-area-inset-right,0px)) 26px max(var(--gutter),env(safe-area-inset-left,0px));
  border-top:1px solid var(--rule);background:color-mix(in srgb,var(--bg) 80%,transparent)}
.foot span{color:var(--faint)}

@media (max-width:820px){
  .bar{height:54px}
  .bar nav{gap:14px}
  .bar nav a{font-size:11px}
  .ch{align-items:start;min-height:0;padding-top:92px;padding-bottom:0}
  .ch::after{content:"";display:block;height:64svh}
  .ch.right .copy{justify-self:start}
  .copy{max-width:none;padding-bottom:10px}
  .copy::before{content:"";position:absolute;z-index:-1;inset:-40px calc(-1*var(--gutter)) -60px;
    background:linear-gradient(transparent,color-mix(in srgb,var(--bg) 84%,transparent) 14%,color-mix(in srgb,var(--bg) 84%,transparent) 78%,transparent)}
  .facts div{grid-template-columns:6rem 1fr}
  .figure{grid-template-columns:1fr;gap:10px}
}
@media (prefers-reduced-motion:reduce){html{scroll-behavior:auto}*{transition:none!important}}

.ptext .ch-hero .copy::before{display:none}