/* Pluto Super Intelligence
   Self-hosted faces. One accent colour. Hairline rules.
   Gradients: exactly one, the hero glow. Nothing else. No JavaScript anywhere. */

@font-face{font-family:"Inter";font-style:normal;font-weight:400;font-display:swap;
  src:url("/fonts/inter-latin-400-normal.woff2") format("woff2")}
@font-face{font-family:"Inter";font-style:normal;font-weight:500;font-display:swap;
  src:url("/fonts/inter-latin-500-normal.woff2") format("woff2")}
@font-face{font-family:"Inter";font-style:normal;font-weight:600;font-display:swap;
  src:url("/fonts/inter-latin-600-normal.woff2") format("woff2")}
@font-face{font-family:"IBM Plex Serif";font-style:normal;font-weight:400;font-display:swap;
  src:url("/fonts/ibm-plex-serif-latin-400-normal.woff2") format("woff2")}
@font-face{font-family:"IBM Plex Serif";font-style:italic;font-weight:400;font-display:swap;
  src:url("/fonts/ibm-plex-serif-latin-400-italic.woff2") format("woff2")}
@font-face{font-family:"IBM Plex Serif";font-style:normal;font-weight:600;font-display:swap;
  src:url("/fonts/ibm-plex-serif-latin-600-normal.woff2") format("woff2")}

:root{
  --paper:#FBFAF7; --card:#F4F2EC; --card2:#EFEDE5; --hair:#DCD8CC;
  --ink:#1A1A18; --ink2:#44443F;
  --mute:#6A6A62;            /* 5.22 paper / 4.87 card / 4.65 card2 */
  --accent:#C25A38;          /* rules, borders, marks. never text on paper */
  --accent-text:#A84A2C;     /* text and links on light. 5.47:1 */
  --accent-soft:#FDF6F2; --green:#3D6543; --slate:#31485A;

  /* dark bands */
  --dark:#141412; --dark-2:#1E1E1B; --dark-hair:#343430;
  --on-dark:#F6F4EF;         /* 16.78 band / 15.20 raised card */
  --on-dark-2:#C9C7BE;       /* 10.89 / 9.86 */
  --on-dark-mute:#9C9A92;    /* 6.54 / 5.93 */
  --accent-dark:#DE7F5D;     /* 6.41 / 5.81. base terracotta is 4.23 and fails */

  --serif:"IBM Plex Serif",Georgia,serif; --sans:"Inter",system-ui,sans-serif;
  --wrap:1140px;
  --shadow-sm:0 1px 2px rgba(26,26,24,.04), 0 4px 14px rgba(26,26,24,.05);
  --shadow-md:0 2px 4px rgba(26,26,24,.05), 0 12px 34px rgba(26,26,24,.09);
  --shadow-dark:0 2px 6px rgba(0,0,0,.34), 0 18px 48px rgba(0,0,0,.4);
  --rhythm:clamp(84px,10vw,132px);   /* ~1.5x the previous 78px */
}
*{box-sizing:border-box}
html{scroll-behavior:smooth;-webkit-text-size-adjust:100%}
body{margin:0;background:var(--paper);color:var(--ink2);font-family:var(--sans);
  font-size:16.5px;line-height:1.7;-webkit-font-smoothing:antialiased;text-align:left;
  overflow-x:hidden}
h1,h2,h3,h4{font-family:var(--serif);color:var(--ink);font-weight:600;margin:0}
p{margin:0 0 17px}
a{color:var(--accent-text)}
.wrap{max-width:var(--wrap);margin:0 auto;padding:0 32px}
.narrow{max-width:780px}
.skip{position:absolute;left:-9999px;top:0;background:var(--paper);color:var(--ink);
  padding:10px 16px;border:1px solid var(--accent);border-radius:8px;z-index:200}
.skip:focus{left:12px;top:12px}

/* ---------- type scale ---------- */
h1{font-size:clamp(40px,7.4vw,72px);line-height:1.03;letter-spacing:-.021em}
h2{font-size:clamp(28px,4.2vw,44px);line-height:1.1;letter-spacing:-.014em}
h3{font-size:24px;line-height:1.2;letter-spacing:-.008em}
h4{font-size:20px;line-height:1.25;letter-spacing:-.006em}
.eyebrow{font-size:11px;letter-spacing:.17em;text-transform:uppercase;color:var(--accent-text);
  font-weight:500;margin:0 0 18px}
.lede{font-family:var(--serif);font-style:italic;color:var(--accent-text);
  font-size:clamp(19px,2vw,22px);line-height:1.5}

/* ---------- nav ---------- */
header.nav{position:sticky;top:0;z-index:60;background:rgba(251,250,247,.82);
  backdrop-filter:saturate(150%) blur(14px);-webkit-backdrop-filter:saturate(150%) blur(14px);
  border-bottom:1px solid var(--hair)}
.nav-in{display:flex;align-items:center;gap:14px;height:58px}
.mark{display:inline-flex;align-items:center;gap:11px;text-decoration:none;color:var(--ink)}
.mark img{width:26px;height:26px;display:block}
.brand{font-size:12px;letter-spacing:.13em;text-transform:uppercase;color:var(--ink);font-weight:500}
.nav-links{margin-left:auto;display:flex;gap:26px;align-items:center}
.nav-links a{font-size:13.5px;color:var(--mute);text-decoration:none;position:relative;
  transition:color .16s}
.nav-links a:not(.btn)::after{content:"";position:absolute;left:0;right:0;bottom:-5px;height:1.5px;
  background:var(--accent);transform:scaleX(0);transform-origin:left;transition:transform .22s ease}
.nav-links a:not(.btn):hover{color:var(--accent-text)}
.nav-links a:not(.btn):hover::after{transform:scaleX(1)}

/* ---------- buttons ---------- */
.btn{display:inline-flex;align-items:center;gap:7px;font-size:14px;font-weight:500;
  text-decoration:none;padding:11px 20px;border-radius:10px;border:1px solid var(--accent);
  transition:background .18s,color .18s,border-color .18s,transform .18s,box-shadow .18s}
.btn-solid{background:var(--accent-text);color:#fff;border-color:var(--accent-text);
  box-shadow:var(--shadow-sm)}
.btn-solid:hover{background:#8E3D23;border-color:#8E3D23;transform:translateY(-1px);
  box-shadow:var(--shadow-md)}
.btn-ghost{color:var(--accent-text);background:transparent}
.btn-ghost:hover{background:var(--accent-soft)}
.btn-quiet{border-color:var(--hair);color:var(--ink2)}
.btn-quiet:hover{border-color:var(--accent);color:var(--accent-text);transform:translateY(-1px)}
.on-dark .btn-quiet{border-color:var(--dark-hair);color:var(--on-dark-2)}
.on-dark .btn-quiet:hover{border-color:var(--accent-dark);color:var(--accent-dark)}
.on-dark .btn-solid{background:var(--accent-dark);border-color:var(--accent-dark);color:#180D07}
.on-dark .btn-solid:hover{background:#EE9878;border-color:#EE9878}

/* ---------- hero, and the one permitted gradient ---------- */
.hero{position:relative;padding:clamp(72px,9vw,116px) 0 clamp(52px,6vw,76px);overflow:hidden}
.hero::before{content:"";position:absolute;top:-330px;left:50%;width:1180px;height:820px;
  transform:translateX(-58%);pointer-events:none;z-index:0;
  background:radial-gradient(closest-side, rgba(194,90,56,.13), rgba(194,90,56,0) 100%)}
.hero>.wrap{position:relative;z-index:1}
.hero-logo{width:clamp(72px,9vw,104px);height:auto;display:block;margin:0 0 34px}
.hero h1{max-width:15ch}
.hero .lede{margin-top:26px;max-width:50ch}
.hero p.sub{margin-top:24px;max-width:60ch;font-size:17px}
.hero-cta{display:flex;flex-wrap:wrap;gap:12px;margin-top:38px}

/* ---------- sections and bands ---------- */
section{padding:var(--rhythm) 0;border-bottom:1px solid var(--hair)}
section.on-dark{background:var(--dark);border-bottom:0;border-top:0;color:var(--on-dark-2)}
.on-dark h1,.on-dark h2,.on-dark h3,.on-dark h4{color:var(--on-dark)}
.on-dark .eyebrow{color:var(--accent-dark)}
.on-dark .lede{color:var(--accent-dark)}
.on-dark a{color:var(--accent-dark)}
.on-dark b,.on-dark strong{color:var(--on-dark)}

.two{display:grid;grid-template-columns:1fr 1.3fr;gap:clamp(40px,6vw,72px);align-items:start}
.body-lg{font-size:17px}
.body-lg p:last-child{margin-bottom:0}

/* ---------- principles ---------- */
.principles{list-style:none;padding:0;margin:30px 0 0;display:grid;gap:20px}
.principles li{display:grid;grid-template-columns:28px 1fr;gap:16px;font-size:16px}
.principles .n{font-family:var(--serif);color:var(--accent-dark);font-size:15px;padding-top:2px}
.principles b{color:var(--on-dark);font-weight:600}

/* ---------- stat band ---------- */
.stats{display:grid;grid-template-columns:repeat(auto-fit,minmax(180px,1fr));
  gap:1px;margin-top:52px;background:var(--dark-hair);
  border:1px solid var(--dark-hair);border-radius:14px;overflow:hidden}
.stat{background:var(--dark);padding:26px 24px}
.stat b{display:block;font-family:var(--serif);font-weight:600;color:var(--on-dark);
  font-size:clamp(32px,3.6vw,42px);line-height:1.05;letter-spacing:-.02em}
.stat span{display:block;margin-top:9px;font-size:12.5px;color:var(--on-dark-mute);line-height:1.45}

/* ---------- browser frame ---------- */
.frame{border:1px solid var(--hair);border-radius:14px;overflow:hidden;background:var(--card);
  box-shadow:var(--shadow-md)}
.frame-bar{display:flex;align-items:center;gap:8px;padding:11px 14px;background:var(--card2);
  border-bottom:1px solid var(--hair)}
.dot{width:9px;height:9px;border-radius:50%;background:var(--hair);flex:none}
.frame-url{margin-left:8px;font-size:11.5px;color:var(--mute);background:var(--paper);
  border:1px solid var(--hair);border-radius:99px;padding:3px 12px;
  white-space:nowrap;overflow:hidden;text-overflow:ellipsis;max-width:min(340px,60%)}
.frame img{display:block;width:100%;height:auto}
.on-dark .frame{border-color:var(--dark-hair);background:var(--dark-2);box-shadow:var(--shadow-dark)}
.on-dark .frame-bar{background:#252521;border-bottom-color:var(--dark-hair)}
.on-dark .dot{background:#3E3E39}
.on-dark .frame-url{background:var(--dark);border-color:var(--dark-hair);color:var(--on-dark-mute)}

/* ---------- feature rows ---------- */
.frow{display:grid;grid-template-columns:1fr 1fr;gap:clamp(32px,5vw,64px);align-items:center;
  margin-top:clamp(44px,5vw,64px)}
.frow.flip>.frow-media{order:-1}
.frow h3,.frow h4{margin-bottom:12px}
.frow p{font-size:15.5px}
.frow p:last-child{margin-bottom:0}

/* ---------- timeline ---------- */
.timeline{list-style:none;padding:0;margin:44px 0 0;border-top:1px solid var(--hair)}
.timeline li{display:grid;grid-template-columns:210px 1fr;gap:32px;padding:26px 0;
  border-bottom:1px solid var(--hair)}
.timeline .when{font-family:var(--serif);color:var(--accent-text);font-size:15.5px;font-weight:600}
.timeline .what{font-size:16px}
.timeline .what b{color:var(--ink);font-weight:600;display:block;margin-bottom:3px}

/* ---------- cards ---------- */
.cards{display:grid;grid-template-columns:1fr 1fr;gap:26px;margin-top:44px}
.card{border:1px solid var(--hair);border-radius:16px;background:var(--card);padding:30px;
  display:flex;flex-direction:column;box-shadow:var(--shadow-sm);
  transition:transform .22s ease,box-shadow .22s ease}
.card:hover{transform:translateY(-3px);box-shadow:var(--shadow-md)}
.card.feature{background:var(--accent-soft);border-color:var(--accent)}
.card.wide{grid-column:1 / -1}
.card-top{display:flex;align-items:center;gap:11px;margin-bottom:16px;flex-wrap:wrap}
.tag{font-size:10.5px;letter-spacing:.1em;text-transform:uppercase;padding:4px 10px;
  border-radius:99px;border:1px solid var(--hair);color:var(--mute);background:var(--paper)}
.tag.live{border-color:var(--green);color:var(--green)}
.tag.beta{border-color:var(--accent);color:var(--accent-text)}
.tag.research{border-color:var(--accent-dark);color:var(--accent-dark);background:transparent}
.card p{font-size:15.5px;margin:0 0 15px}
.card ul{margin:0 0 20px;padding-left:19px;font-size:15px}
.card ul li{margin:8px 0}
.card .actions{margin-top:auto;display:flex;flex-wrap:wrap;gap:10px;padding-top:6px}

/* ---------- disclosure blocks ---------- */
.notice{border:1px solid var(--accent);background:var(--paper);border-radius:12px;
  padding:18px 20px;font-size:14.5px;margin:0 0 18px;color:var(--ink2)}
.notice b{color:var(--ink);display:block;margin-bottom:6px;font-family:var(--sans);
  font-size:13px;letter-spacing:.02em;font-weight:600}
.quiet-note{background:var(--card2);border-radius:12px;padding:17px 19px;font-size:14.5px;
  margin:0 0 18px}
.quiet-note b{color:var(--ink)}
.on-dark .notice{background:var(--dark-2);border-color:var(--accent-dark);color:var(--on-dark-2)}
.on-dark .notice b{color:var(--on-dark)}
.on-dark .quiet-note{background:var(--dark-2);color:var(--on-dark-2)}
.on-dark .quiet-note b{color:var(--on-dark)}

/* ---------- research ---------- */
.paper{border:1px solid var(--hair);border-radius:16px;background:var(--paper);overflow:hidden;
  margin-top:44px;box-shadow:var(--shadow-sm)}
.paper-head{padding:32px 34px;border-bottom:1px solid var(--hair);background:var(--card)}
.paper-head h3{max-width:38ch;font-size:23px}
.paper-head .meta{font-size:12.5px;color:var(--mute);margin:12px 0 0}
.paper-body{padding:30px 34px}
.paper-body p{font-size:15.5px}
.results{display:grid;grid-template-columns:repeat(auto-fit,minmax(180px,1fr));gap:18px;margin:26px 0}
.result{border-left:2px solid var(--accent);padding-left:14px}
.result b{display:block;font-family:var(--serif);font-size:22px;color:var(--ink);letter-spacing:-.01em}
.result span{font-size:12.5px;color:var(--mute)}

/* ---------- people ---------- */
.people{display:grid;grid-template-columns:1fr 1fr;gap:26px;margin-top:44px}
.person{border:1px solid var(--hair);border-radius:16px;padding:30px;background:var(--card);
  box-shadow:var(--shadow-sm);transition:transform .22s ease,box-shadow .22s ease}
.person:hover{transform:translateY(-3px);box-shadow:var(--shadow-md)}
.person h3{font-size:20px}
.person .role{font-size:12.5px;color:var(--accent-text);letter-spacing:.05em;margin:4px 0 0}
.person p:last-child{font-size:15px;margin:14px 0 0}

.contact-row{display:flex;flex-wrap:wrap;gap:14px;margin-top:30px}

/* ---------- long-form pages ---------- */
.legal h2{font-size:23px;margin:48px 0 14px;letter-spacing:-.008em}
.legal h3{font-size:17px;font-family:var(--sans);margin:30px 0 9px;color:var(--ink);
  letter-spacing:0;font-weight:600}
.legal ul{padding-left:21px}
.legal li{margin:9px 0}
.legal table,.rtable{width:100%;border-collapse:collapse;margin:20px 0;font-size:14.5px}
.legal th,.legal td,.rtable th,.rtable td{text-align:left;padding:12px 14px;
  border-bottom:1px solid var(--hair);vertical-align:top}
.legal th,.rtable th{font-family:var(--sans);font-size:11.5px;letter-spacing:.08em;
  text-transform:uppercase;color:var(--mute);font-weight:500;background:var(--card2)}
.rtable td:last-child{color:var(--ink)}
.abstract{background:var(--card);border-left:2px solid var(--accent);padding:26px 28px;
  border-radius:0 12px 12px 0;font-size:16px}
.abstract p:last-child{margin-bottom:0}
.dl{display:flex;flex-wrap:wrap;gap:12px;margin:30px 0 44px}
.updated{font-size:13px;color:var(--mute);margin-top:18px;padding-top:18px;
  border-top:1px solid var(--hair)}

/* body-copy links get a persistent rule that strengthens on hover */
.legal p a,.abstract a,.body-lg a{text-decoration:none;position:relative}
.legal p a::after,.abstract a::after,.body-lg a::after{content:"";position:absolute;left:0;
  right:0;bottom:-2px;height:1px;background:currentColor;opacity:.42;transition:opacity .2s ease}
.legal p a:hover::after,.abstract a:hover::after,.body-lg a:hover::after{opacity:1}

/* ---------- footer ---------- */
footer{padding:64px 0 52px}
.foot-grid{display:flex;flex-wrap:wrap;gap:40px;align-items:flex-start}
.foot-col{min-width:150px}
.foot-col h2{font-family:var(--sans);font-size:11px;letter-spacing:.14em;text-transform:uppercase;
  color:var(--mute);margin:0 0 14px;font-weight:500}
.foot-col a{display:block;font-size:14.5px;color:var(--ink2);text-decoration:none;margin:7px 0;
  transition:color .16s}
.foot-col a:hover{color:var(--accent-text)}
.foot-bottom{margin-top:48px;padding-top:24px;border-top:1px solid var(--hair);display:flex;
  flex-wrap:wrap;gap:16px;font-size:12.5px;color:var(--mute)}

a:focus-visible,button:focus-visible{outline:2px solid var(--accent-text);outline-offset:3px;
  border-radius:6px}
.on-dark a:focus-visible{outline-color:var(--accent-dark)}

/* ---------- scroll-driven reveal, progressive enhancement ----------
   Default state is fully visible. The animation attaches only where
   animation-timeline is supported AND motion is not reduced, so content
   can never be stranded invisible. No JavaScript involved. */
@keyframes rise-in{from{opacity:0;transform:translateY(20px)}to{opacity:1;transform:none}}
@supports (animation-timeline: view()){
  @media (prefers-reduced-motion: no-preference){
    .reveal{animation:rise-in linear both;animation-timeline:view();
      animation-range:entry 4% cover 26%}
  }
}

/* ---------- responsive ---------- */
@media(max-width:960px){
  .two,.cards,.people,.frow{grid-template-columns:1fr}
  .frow{gap:30px}
  .frow.flip>.frow-media{order:0}
  .card.wide{grid-column:auto}
  /* measured: mark + wordmark + 5 links + CTA needs 815px and does not fit
     until 960px. Below that, the footer carries the section navigation. */
  .nav-links a:not(.btn){display:none}
  .nav-links{gap:12px}
}
@media(max-width:700px){
  .legal table,.rtable{display:block;overflow-x:auto;-webkit-overflow-scrolling:touch}
  .rtable th,.rtable td,.legal th,.legal td{min-width:104px}
  .timeline li{grid-template-columns:1fr;gap:7px;padding:22px 0}
  .wrap{padding:0 20px}
  .paper-head,.paper-body{padding:24px 22px}
  .card,.person{padding:24px}
  .abstract{padding:22px 20px}
  .foot-bottom{flex-direction:column;gap:9px}
  .frame-url{max-width:52%}
}
@media(max-width:560px){
  .results,.stats{grid-template-columns:1fr}
}
/* measured: mark + wordmark + solid CTA needs 384px and clears the viewport
   only from ~424px. Drop the wordmark below 460px for margin. */
@media(max-width:460px){
  .brand{display:none}
}
@media(prefers-reduced-motion:reduce){
  *{transition:none!important;animation:none!important}
  html{scroll-behavior:auto}
  .card:hover,.person:hover,.btn:hover{transform:none}
}