/*
  AgentEval — editorial site styles, shared by every page.
  Palette unchanged from the original design; layout, scale and interaction are new.
*/

:root{
  --bg:#eeecf6;
  --bg-hi:#f8f6fc;
  --bg-lo:#e6e3f0;
  --card:#ffffff;
  --panel-2:#fbfbfe;
  --brand-light:#c7cfff;
  --ink:#12162a;
  --text-dim:#454e66;
  --rule:#e6e6f2;
  --rule-strong:rgba(18,22,42,.14);
  --accent:#8a93f0;
  --brand-deep:#6b74d6;
  --accent-dim:#6b7386;
  --muted:#6b7386;

  --page-max:1320px;
  --gutter:clamp(20px, 4vw, 56px);
  --ease-out:cubic-bezier(.22,1,.36,1);
  --display:'Archivo', 'IBM Plex Sans Hebrew', sans-serif;
  --text:'IBM Plex Sans Hebrew', 'Archivo', sans-serif;
  --mono:'IBM Plex Mono', monospace;
}

*{margin:0;padding:0;box-sizing:border-box;}

body{
  background-color:var(--bg);
  background-image:linear-gradient(176deg, var(--bg-hi) 0%, var(--bg) 42%, var(--bg-lo) 100%);
  background-attachment:fixed;
  color:var(--ink);
  font-family:var(--text);
  min-height:100vh;
  overflow-x:hidden;
  position:relative;
  -webkit-font-smoothing:antialiased;
}

::selection{ background:var(--brand-light); color:var(--ink); }

/* paper grain + soft vignette */
body::before{
  content:"";
  position:fixed;
  inset:0;
  background-image:url("data:image/svg+xml;utf8,<svg xmlns='http://www.w3.org/2000/svg' width='180' height='180'><filter id='n'><feTurbulence type='fractalNoise' baseFrequency='0.85' numOctaves='2' stitchTiles='stitch'/><feColorMatrix type='saturate' values='0'/></filter><rect width='100%25' height='100%25' filter='url(%23n)' opacity='0.5'/></svg>");
  opacity:.035;
  mix-blend-mode:multiply;
  pointer-events:none;
  z-index:0;
}
body::after{
  content:"";
  position:fixed;
  inset:0;
  background:radial-gradient(circle at 50% 28%, transparent 0%, transparent 40%, rgba(18,22,42,.04) 100%);
  pointer-events:none;
  z-index:0;
}

.wrap{
  position:relative;
  z-index:1;
  max-width:var(--page-max);
  margin:0 auto;
  padding:0 var(--gutter) clamp(96px, 14vh, 160px);
}

/* ---------- fixed chrome: back link (top-right) mirrors the language switch (top-left) ---------- */
a.back{
  position:fixed;
  top:14px;
  right:14px;
  margin-top:0;
  z-index:60;
  display:inline-flex;
  align-items:center;
  gap:8px;
  padding:9px 16px;
  border-radius:999px;
  background:var(--card);
  border:1px solid var(--rule);
  box-shadow:0 1px 2px rgba(18,22,42,.04), 0 8px 20px rgba(18,22,42,.08);
  color:var(--ink);
  text-decoration:none;
  font-family:var(--mono);
  font-size:13px;
  font-weight:500;
  letter-spacing:.04em;
  transition:gap .35s var(--ease-out), background-color .25s ease, border-color .25s ease;
}
a.back:hover, a.back:focus-visible{
  gap:14px;
  background:var(--brand-light);
  border-color:var(--accent);
}
a.back:focus-visible{ outline:2px solid var(--accent); outline-offset:3px; }

/* reading progress, created by motion.js */
.scroll-progress{
  position:fixed;
  top:0; left:0; right:0;
  height:3px;
  background:var(--accent);
  transform:scaleX(0);
  transform-origin:left center;
  z-index:70;
  pointer-events:none;
}
:root[dir="rtl"] .scroll-progress{ transform-origin:right center; }

/* ---------- hero ---------- */
.hero{
  padding-top:clamp(112px, 20vh, 220px);
  padding-bottom:clamp(28px, 5vw, 56px);
  border-bottom:1px solid var(--rule-strong);
  margin-bottom:clamp(48px, 9vw, 120px);
}
.hero h1{
  font-family:var(--display);
  font-weight:800;
  font-size:clamp(44px, 12.5vw, 196px);
  line-height:.9;
  letter-spacing:-.045em;
  direction:ltr;
  text-align:left;
}
:root[dir="rtl"] .hero h1{ text-align:right; }

/* ---------- home ---------- */
.hero--home{
  min-height:min(86svh, 980px);
  display:flex;
  flex-direction:column;
  justify-content:flex-end;
  border-bottom:0;
  margin-bottom:0;
}
.hero--home h1{
  font-size:clamp(56px, 16.4vw, 252px);
  line-height:.8;
  letter-spacing:-.055em;
  text-align:center !important;
  /* the face's side bearings make the optical block look off-centre */
  margin-inline:-.04em;
}
.hero-meta{
  display:flex;
  align-items:flex-end;
  justify-content:space-between;
  gap:24px;
  margin-top:clamp(28px, 4.5vw, 56px);
  padding-top:20px;
  border-top:1px solid var(--rule-strong);
}
.sub{
  max-width:46ch;
  font-weight:500;
  font-size:clamp(16px, 1.35vw, 19px);
  line-height:1.75;
  text-align:start;
}
.scroll-cue{
  flex-shrink:0;
  width:52px; height:52px;
  border-radius:50%;
  border:1.5px solid var(--ink);
  display:grid;
  place-items:center;
}
.scroll-cue svg{ width:20px; height:20px; animation:cueBob 2.2s var(--ease-out) infinite; }
@keyframes cueBob{
  0%, 100%{ transform:translateY(-3px); }
  50%{ transform:translateY(4px); }
}

.index{
  margin-top:clamp(40px, 7vw, 96px);
  border-top:1px solid var(--rule-strong);
}
.doc-row a{
  position:relative;
  isolation:isolate;
  overflow:hidden;
  display:flex;
  align-items:center;
  justify-content:space-between;
  gap:20px;
  padding:clamp(18px, 2.6vw, 34px) clamp(4px, 1.4vw, 20px);
  border-bottom:1px solid var(--rule-strong);
  color:var(--ink);
  text-decoration:none;
}
/* fill wipes up from the baseline */
.doc-row a::before{
  content:"";
  position:absolute;
  inset:0;
  z-index:-1;
  background:var(--brand-light);
  transform:scaleY(0);
  transform-origin:bottom center;
  transition:transform .6s var(--ease-out);
}
.doc-row a:hover::before,
.doc-row a:focus-visible::before{ transform:scaleY(1); }
.doc-row a:focus-visible{ outline:2px solid var(--accent); outline-offset:-2px; }

.doc-row .title{
  font-family:var(--display);
  font-weight:800;
  font-size:clamp(32px, 6.6vw, 100px);
  line-height:1;
  letter-spacing:-.04em;
  transition:transform .6s var(--ease-out);
}
.doc-row a:hover .title,
.doc-row a:focus-visible .title{ transform:translateX(clamp(8px, 1.6vw, 28px)); }

.arrow{
  flex-shrink:0;
  width:clamp(44px, 5.4vw, 80px);
  aspect-ratio:1;
  border-radius:50%;
  border:1.5px solid var(--ink);
  display:grid;
  place-items:center;
  color:var(--ink);
  transition:background-color .4s var(--ease-out), border-color .4s var(--ease-out), color .4s var(--ease-out);
}
.arrow svg{ width:38%; height:38%; transition:transform .6s var(--ease-out); }
.doc-row a:hover .arrow,
.doc-row a:focus-visible .arrow{ background:var(--ink); border-color:var(--ink); color:var(--card); }
.doc-row a:hover .arrow svg,
.doc-row a:focus-visible .arrow svg{ transform:translateX(18%); }
/* external links point up-and-out */
.doc-row a.ext .arrow svg{ transform:rotate(-45deg); }
.doc-row a.ext:hover .arrow svg,
.doc-row a.ext:focus-visible .arrow svg{ transform:rotate(-45deg) translateX(18%); }

/* ---------- inner pages: rail + offset reading column ---------- */
.body-grid{
  display:grid;
  grid-template-columns:minmax(0, 1fr) minmax(0, 2.4fr);
  gap:clamp(32px, 6vw, 96px);
}
.rail{
  position:sticky;
  top:120px;
  align-self:start;
  height:42vh;
  display:flex;
  /* hug the reading column rather than the page edge */
  justify-content:flex-end;
}
.rail-track{
  position:relative;
  width:2px;
  height:100%;
  background:var(--rule-strong);
  border-radius:2px;
  overflow:hidden;
}
.rail-fill{
  position:absolute;
  inset:0;
  background:var(--accent);
  transform:scaleY(0);
  transform-origin:top center;
}
.col{ min-width:0; }

.prose{
  font-size:clamp(17px, 1.3vw, 19px);
  line-height:1.9;
  max-width:68ch;
}
.prose p{ margin-bottom:1.35em; }
.prose p:last-child{ margin-bottom:0; }

/* links: underline that floods into a highlight */
.prose a, .source a{
  color:var(--ink);
  text-decoration:none;
  background-image:linear-gradient(var(--brand-light), var(--brand-light));
  background-repeat:no-repeat;
  background-position:0 100%;
  background-size:100% 2px;
  padding:0 2px;
  transition:background-size .45s var(--ease-out);
}
.prose a:hover, .prose a:focus-visible,
.source a:hover, .source a:focus-visible{ background-size:100% 100%; }

/* problem — short statements set large; scroll lights each one up */
.prose--statements{
  max-width:30ch;
  font-size:clamp(22px, 2.4vw, 36px);
  font-weight:500;
  line-height:1.45;
  letter-spacing:-.01em;
}
.prose--statements p{ margin-bottom:1.1em; }
.prose--statements .pull{
  font-weight:700;
  font-size:1.45em;
  line-height:1.2;
  margin-block:1.4em;
}
.prose--statements .pull::before,
.prose--letter p:last-child::before{
  content:"";
  display:block;
  width:56px;
  height:4px;
  border-radius:2px;
  background:var(--accent);
  margin-bottom:.6em;
}

/* about — a letter: big opener, big sign-off */
.prose--letter{ font-size:clamp(19px, 1.6vw, 23px); line-height:1.75; max-width:44ch; }
.prose--letter p:first-child{
  font-size:clamp(28px, 3.4vw, 50px);
  font-weight:600;
  line-height:1.25;
  letter-spacing:-.015em;
  margin-bottom:1.1em;
}
.prose--letter p:last-child{
  font-size:clamp(28px, 3.4vw, 50px);
  font-weight:700;
  line-height:1.2;
  margin-top:1.4em;
}

/* research — long-form, with a lead paragraph */
.prose--long > p:first-child{
  font-size:clamp(21px, 1.9vw, 27px);
  font-weight:500;
  line-height:1.65;
  margin-bottom:1.4em;
}

.source{
  margin-top:clamp(48px, 7vw, 88px);
  padding-top:20px;
  border-top:1px solid var(--rule-strong);
  font-size:14.5px;
  line-height:1.7;
  color:var(--text-dim);
  max-width:68ch;
}
.source a{ overflow-wrap:anywhere; }

/* ---------- PRD ---------- */
.page--prd .hero h1{
  font-family:'IBM Plex Sans Hebrew', 'Archivo', sans-serif;
  font-weight:700;
  font-size:clamp(40px, 8.6vw, 136px);
  letter-spacing:-.03em;
  direction:inherit;
  text-align:start;
}
.prose--doc{ font-size:17px; line-height:1.9; max-width:72ch; }
.prose--doc h2{
  font-family:var(--display);
  font-weight:800;
  font-size:clamp(32px, 4.4vw, 64px);
  line-height:1.08;
  letter-spacing:-.025em;
  margin:clamp(72px, 10vw, 128px) 0 .55em;
  padding-top:.5em;
  border-top:1px solid var(--rule-strong);
}
.prose--doc h2:first-child{ margin-top:0; }
.prose--doc h3{
  font-family:var(--display);
  font-weight:700;
  font-size:clamp(22px, 2.3vw, 30px);
  line-height:1.3;
  letter-spacing:-.01em;
  margin:2.1em 0 .6em;
}
.prose--doc h4{
  font-weight:700;
  font-size:17px;
  margin:2em 0 .5em;
  padding-inline-start:14px;
  border-inline-start:3px solid var(--accent);
  line-height:1.4;
}
.prose--doc p{ margin-bottom:1.15em; }
.assumption{ font-weight:600; margin-bottom:.35em !important; }

.prose--doc ul, .prose--doc ol{ margin:0 0 1.5em; padding-inline-start:1.5em; }
.prose--doc li{ margin-bottom:.7em; line-height:1.8; padding-inline-start:.25em; }
.prose--doc ol li::marker{ font-family:var(--mono); font-weight:500; color:var(--brand-deep); }
.prose--doc ul li::marker{ color:var(--accent); }
.prose--doc strong{ font-weight:700; }

.tag{
  display:inline-block;
  font-family:var(--mono);
  font-size:.78em;
  font-weight:500;
  line-height:1.5;
  padding:0 .55em;
  border-radius:999px;
  background:var(--brand-light);
  color:var(--ink);
  unicode-bidi:isolate;
  white-space:nowrap;
  margin-inline-end:6px;
  vertical-align:.08em;
}
.prose--doc h4 .tag{ font-size:.82em; }

/* open questions as cards */
.q{
  margin-bottom:14px;
  padding:20px 24px;
  background:var(--card);
  border:1px solid var(--rule);
  border-inline-start:4px solid var(--accent);
  border-radius:14px;
  box-shadow:0 1px 2px rgba(18,22,42,.04), 0 14px 28px rgba(18,22,42,.06);
}
.q-text{ font-weight:600; margin-bottom:8px !important; }
.q-why{ font-size:15px; line-height:1.7; margin-bottom:0 !important; color:var(--text-dim); }
.q-label{ font-weight:700; color:var(--ink); margin-inline-end:6px; }

/* ---- core-flow figure: six step cards + a return loop (geometry unchanged) ---- */
@keyframes cvIn{ from{opacity:0;transform:translateY(8px);} to{opacity:1;transform:none;} }

.flow-fig{
  margin:2.2em 0 2.4em;
  max-width:480px;
  padding:24px 24px 20px;
  background:var(--panel-2);
  border:1px solid var(--rule);
  border-radius:20px;
  box-shadow:0 1px 2px rgba(18,22,42,.04), 0 24px 48px rgba(18,22,42,.07);
  --ff-card-h:108px;
  --ff-gap:18px;
  --ff-step:calc(var(--ff-card-h) + var(--ff-gap));
}
.ff-kicker{
  font:500 12px/1.4 var(--mono);
  letter-spacing:.06em;
  color:var(--ink);
  margin-bottom:14px;
}
.ff-deck{ position:relative; padding-left:36px; }
.ff-cards{ display:flex; flex-direction:column; }
.ff-card{
  background:var(--card);
  border:1px solid var(--rule);
  border-radius:12px;
  box-shadow:0 1px 2px rgba(18,22,42,.04), 0 10px 20px rgba(18,22,42,.06);
  padding:12px 15px;
  height:var(--ff-card-h);
  display:flex;
  flex-direction:column;
  gap:3px;
  animation:cvIn .5s cubic-bezier(.16,1,.3,1) both;
  animation-delay:calc(var(--i, 0) * .05s);
}
.ff-top{ display:flex; align-items:center; justify-content:space-between; gap:10px; margin-bottom:1px; }
.ff-num{ font:500 11.5px var(--mono); letter-spacing:.08em; color:var(--accent-dim); }
.ff-icon{
  width:27px; height:27px;
  border-radius:8px;
  display:grid; place-items:center;
  background:color-mix(in srgb, var(--accent) 9%, #fff);
  border:1px solid var(--rule);
  color:var(--brand-deep);
  flex-shrink:0;
}
.ff-icon svg{ width:15px; height:15px; display:block; }
.ff-title{ font:700 15.5px/1.3 var(--display); color:var(--ink); display:block; }
.ff-desc{ font:400 12px/1.45 var(--text); color:var(--muted); display:block; }
.ff-link{ height:var(--ff-gap); display:grid; place-items:center; color:var(--accent); }
.ff-link svg{ width:12px; height:12px; display:block; }
.ff-loop{
  position:absolute;
  left:2px;
  top:calc(var(--ff-step) + var(--ff-card-h) / 2);
  height:calc(var(--ff-step) * 4);
  width:22px;
  border:2px solid var(--accent);
  border-right:none;
  border-radius:11px 0 0 11px;
}
.ff-arrow{
  position:absolute;
  left:20px;
  top:calc(var(--ff-step) + var(--ff-card-h) / 2);
  transform:translateY(-50%);
}
.ff-cap{
  display:flex;
  align-items:baseline;
  gap:7px;
  margin-top:14px;
  padding-left:36px;
  font:400 12px/1.55 var(--text);
  color:var(--text-dim);
}
.ff-cap .ff-rc{ color:var(--accent); flex-shrink:0; transform:translateY(3px); }
.ff-cap .ff-rc svg{ width:13px; height:13px; display:block; }

/* motion.js reveals the flow cards on scroll instead of on load */
html.motion .ff-card{ animation:none; }

/* ---------- responsive ---------- */
@media (max-width:900px){
  .body-grid{ grid-template-columns:1fr; }
  .rail{ display:none; }
}
@media (max-width:560px){
  a.back{ top:10px; right:10px; padding:7px 12px; font-size:12px; }
  .hero--home{ min-height:62svh; }
  .hero-meta{ align-items:flex-start; }
  .scroll-cue{ display:none; }
  .doc-row a{ padding-inline:0; }
  .prose--doc{ font-size:16px; }
  .q{ padding:16px 18px; }
  .flow-fig{ padding:18px 16px 16px; --ff-card-h:104px; --ff-gap:16px; }
  .ff-deck, .ff-cap{ padding-left:30px; }
}

@media (prefers-reduced-motion:reduce){
  *, *::before, *::after{ transition-duration:.01ms !important; animation-duration:.01ms !important; animation-iteration-count:1 !important; }
}