@font-face {
  font-family: "Newsreader Display";
  font-style: normal;
  font-weight: 300;
  font-display: optional;
  src: url("assets/fonts/newsreader-display-300.woff2") format("woff2");
}

@font-face {
  font-family: "Newsreader Text";
  font-style: normal;
  font-weight: 300;
  font-display: optional;
  src: url("assets/fonts/newsreader-text-300.woff2") format("woff2");
}

@font-face {
  font-family: "Inter";
  font-style: normal;
  font-weight: 400 500;
  font-display: optional;
  src: url("assets/fonts/inter-latin.woff2") format("woff2");
}

@font-face {
  font-family: "DM Mono";
  font-style: normal;
  font-weight: 400;
  font-display: optional;
  src: url("assets/fonts/dm-mono-latin.woff2") format("woff2");
}

:root {
  --serif: "Newsreader Text", ui-serif, Georgia, serif;
  --serif-display: "Newsreader Display", ui-serif, Georgia, serif;
  --sans: "Inter", -apple-system, BlinkMacSystemFont, "Segoe UI", sans-serif;
  --mono: "DM Mono", ui-monospace, SFMono-Regular, Menlo, monospace;
  --shell: 1120px;
  --gutter: clamp(24px, 5vw, 56px);
  --rail: 154px;
  --section-y: clamp(76px, 9vw, 126px);
  --ease: cubic-bezier(0.22, 0.61, 0.36, 1);
}

:root,
[data-theme="light"] {
  color-scheme: light;
  --paper: #fafafb;
  --surface: #ffffff;
  --surface-2: #f1f2f4;
  --raised: #f0f1f4;
  --plate: #0d0f12;
  --ink: #121417;
  --ink-2: #494d54;
  --ink-3: #676c74;
  --line: #cfd4db;
  --line-2: #aeb5bf;
  --line-3: #858d98;
  --silver: linear-gradient(90deg, transparent 0%, #c8cdd4 10%, #9da5af 34%, #eef0f3 50%, #969faa 66%, #cbd0d6 90%, transparent 100%);
  --glint: rgba(255, 255, 255, 0.78);
}

[data-theme="dark"] {
  color-scheme: dark;
  --paper: #0c0d0f;
  --surface: #121316;
  --surface-2: #17191d;
  --raised: #131418;
  --plate: #090a0c;
  --ink: #edeef1;
  --ink-2: #a7acb4;
  --ink-3: #83888f;
  --line: #353941;
  --line-2: #505660;
  --line-3: #737b87;
  --silver: linear-gradient(90deg, transparent 0%, #3b4048 10%, #858d98 34%, #c8cdd4 50%, #777f8a 66%, #3e434b 90%, transparent 100%);
  --glint: rgba(255, 255, 255, 0.11);
}

* { box-sizing: border-box; }
[hidden] { display: none !important; }
html { scroll-behavior: smooth; -webkit-text-size-adjust: 100%; }
:where(section[id]) { scroll-margin-top: 92px; }
body {
  margin: 0;
  background: var(--paper);
  color: var(--ink-2);
  font-family: var(--sans);
  font-size: 16px;
  line-height: 1.68;
  -webkit-font-smoothing: antialiased;
  transition: background-color 240ms var(--ease), color 240ms var(--ease);
}
a { color: inherit; }
p { margin: 0 0 1em; }
p:last-child { margin-bottom: 0; }
h1, h2, h3 {
  margin: 0;
  color: var(--ink);
  font-family: var(--serif-display);
  font-weight: 300;
  letter-spacing: -0.016em;
  line-height: 1.05;
  text-wrap: balance;
}
h1 { max-width: 900px; font-size: clamp(48px, 7vw, 82px); line-height: 0.98; letter-spacing: -0.027em; }
h2 { font-size: clamp(34px, 4.5vw, 52px); }
h3 { font-family: var(--serif); font-size: 22px; line-height: 1.18; }
code, pre { font-family: var(--mono); }
::selection { background: var(--ink); color: var(--paper); }
:focus-visible { outline: 1px solid var(--ink); outline-offset: 4px; }

.shell { width: min(var(--shell), calc(100% - (var(--gutter) * 2))); margin: 0 auto; }
.sr-only { position: absolute; width: 1px; height: 1px; padding: 0; margin: -1px; overflow: hidden; clip: rect(0 0 0 0); white-space: nowrap; }
.skip-link { position: fixed; top: -80px; left: 16px; z-index: 30; padding: 10px 16px; background: var(--ink); color: var(--paper); text-decoration: none; }
.skip-link:focus { top: 14px; }
.eyebrow, .rail-label, .study-id {
  color: var(--ink-3);
  font-family: var(--mono);
  font-size: 10.5px;
  letter-spacing: 0.09em;
  text-transform: uppercase;
}

.site-header {
  position: sticky;
  top: 0;
  z-index: 20;
  border-bottom: 1px solid var(--line);
  background: var(--paper);
  background: color-mix(in srgb, var(--paper) 88%, transparent);
  backdrop-filter: blur(14px) saturate(135%);
  -webkit-backdrop-filter: blur(14px) saturate(135%);
}
.header-inner { display: flex; min-height: 72px; align-items: center; gap: 28px; }
.wordmark { margin-right: auto; color: var(--ink); font-family: var(--serif); font-size: 19px; text-decoration: none; white-space: nowrap; }
.study-id i { margin: 0 6px; color: var(--line-3); font-style: normal; }
.study-nav { display: flex; gap: 24px; }
.study-nav a { color: var(--ink-3); font-size: 12.5px; text-decoration: none; }
.study-nav a:hover { color: var(--ink); }
.theme-toggle {
  min-width: 72px;
  padding: 7px 13px;
  border: 1px solid var(--line-2);
  border-radius: 999px;
  background: transparent;
  color: var(--ink-3);
  cursor: pointer;
  font: 400 10px var(--mono);
  letter-spacing: 0.09em;
  text-transform: uppercase;
}
.theme-toggle:hover { border-color: var(--line-3); color: var(--ink); }

.study-hero {
  position: relative;
  overflow: clip;
  padding: clamp(82px, 11vw, 152px) 0 clamp(86px, 10vw, 138px);
  border-bottom: 1px solid var(--line);
}
.study-hero::before {
  position: absolute;
  inset: 0;
  pointer-events: none;
  background:
    linear-gradient(118deg, transparent 0 57%, color-mix(in srgb, var(--line) 38%, transparent) 57.1%, transparent 57.25%),
    repeating-radial-gradient(ellipse at 86% 35%, transparent 0 52px, color-mix(in srgb, var(--line) 46%, transparent) 53px 54px, transparent 55px 92px);
  opacity: 0.52;
  -webkit-mask-image: linear-gradient(90deg, transparent 34%, #000 74%, transparent 100%);
  mask-image: linear-gradient(90deg, transparent 34%, #000 74%, transparent 100%);
  content: "";
}
.hero-grid { position: relative; display: grid; grid-template-columns: minmax(0, 1fr) 292px; gap: clamp(54px, 8vw, 108px); align-items: end; }
.hero-copy .eyebrow { margin-bottom: 24px; }
.hero-lede { max-width: 720px; margin: 34px 0 18px; color: var(--ink); font-family: var(--serif); font-size: clamp(21px, 2.4vw, 28px); line-height: 1.38; }
.hero-supporting { max-width: 620px; color: var(--ink-2); line-height: 1.75; }
.hero-actions { display: flex; flex-wrap: wrap; gap: 10px; margin-top: 34px; }
.button {
  display: inline-flex;
  min-height: 42px;
  align-items: center;
  gap: 9px;
  padding: 0 17px;
  border: 1px solid var(--line-2);
  background: var(--surface);
  color: var(--ink);
  font-size: 13px;
  text-decoration: none;
}
.button:hover { border-color: var(--line-3); }
.button-primary { border-color: var(--ink); background: var(--ink); color: var(--paper); }
.study-facts { border-top: 1.5px solid var(--line-2); }
.study-facts div { padding: 18px 0; border-bottom: 1px solid var(--line); }
.study-facts span { display: block; margin-bottom: 6px; color: var(--ink-3); font: 400 9.5px var(--mono); letter-spacing: 0.08em; text-transform: uppercase; }
.study-facts strong { display: block; color: var(--ink-2); font-size: 13px; font-weight: 400; line-height: 1.5; }

.study-section { position: relative; padding: var(--section-y) 0; border-bottom: 1px solid var(--line); }
.study-section::before { position: absolute; top: -1px; left: 50%; width: min(var(--shell), calc(100% - (var(--gutter) * 2))); height: 2px; background: var(--silver); transform: translateX(-50%); content: ""; }
.section-raised { background: var(--raised); }
.section-grid { display: grid; grid-template-columns: var(--rail) minmax(0, 1fr); gap: clamp(28px, 4vw, 58px); }
.section-rail { padding-top: 9px; }
.section-content { min-width: 0; }
.section-head { margin-bottom: clamp(42px, 5vw, 68px); padding-top: 22px; border-top: 1.5px solid var(--line-2); }
.section-head > p, .section-head > div > p { max-width: 650px; margin-top: 20px; color: var(--ink-2); line-height: 1.75; }
.split-head { display: flex; align-items: end; justify-content: space-between; gap: 28px; }

.idea-steps { display: grid; grid-template-columns: repeat(3, 1fr); gap: clamp(20px, 3vw, 36px); }
.idea-step { padding-top: 18px; border-top: 1.5px solid var(--line-2); }
.idea-step > span { display: block; margin-bottom: 32px; color: var(--ink-3); font: 400 10px var(--mono); }
.idea-step h3 { margin-bottom: 12px; }
.idea-step p { color: var(--ink-2); font-size: 14px; line-height: 1.68; }
.plain-model { max-width: 790px; margin-top: clamp(46px, 6vw, 76px); padding: 25px 0 0 30px; border-top: 1px solid var(--line); border-left: 2px solid var(--line-3); color: var(--ink); font-family: var(--serif); font-size: clamp(19px, 2.1vw, 24px); line-height: 1.5; }

.lab-state { flex: 0 0 auto; padding: 6px 9px; border: 1px solid var(--line-2); color: var(--ink-3); font: 400 9.5px var(--mono); letter-spacing: 0.07em; text-transform: uppercase; }
.lab { display: grid; grid-template-columns: minmax(0, 1fr) 282px; gap: clamp(22px, 3vw, 34px); }
.canvas-frame { position: relative; min-width: 0; overflow: hidden; border: 1.5px solid var(--line-2); background: var(--plate); box-shadow: inset 0 1px 0 var(--glint); }
canvas { display: block; width: 100%; height: auto; aspect-ratio: 3 / 2; }
.canvas-overlay { position: absolute; inset: 14px 14px auto; display: flex; justify-content: space-between; color: #9197a0; font: 400 9px var(--mono); letter-spacing: 0.07em; text-transform: uppercase; pointer-events: none; }
.controls { display: flex; min-width: 0; flex-direction: column; }
.metric { display: flex; align-items: start; justify-content: space-between; gap: 18px; padding: 14px 0; border-bottom: 1px solid var(--line); }
.metric > span { display: grid; gap: 3px; }
.metric b { color: var(--ink-2); font-size: 12px; font-weight: 400; }
.metric small { color: var(--ink-3); font-size: 10px; line-height: 1.45; }
.metric strong { color: var(--ink); font: 400 16px var(--mono); }
.control-actions { display: grid; grid-template-columns: repeat(3, 1fr); gap: 7px; margin-top: 22px; }
button { min-height: 41px; border: 1px solid var(--line-2); background: var(--surface); color: var(--ink); cursor: pointer; font: 400 11px var(--mono); }
button:hover, button:focus-visible { border-color: var(--line-3); }
.intervention { display: flex; align-items: center; gap: 9px; margin-top: 9px; padding: 0 12px; text-align: left; }
.intervention b { margin-left: auto; color: var(--ink-3); font-size: 9px; text-transform: uppercase; }
.indicator { width: 7px; height: 7px; border: 1px solid var(--line-3); border-radius: 50%; }
.intervention.active { border-color: var(--ink); }
.intervention.active .indicator { background: var(--ink); }
.intervention.active b { color: var(--ink); }
.control-note { margin-top: auto; padding-top: 24px; color: var(--ink-3); font-size: 11px; line-height: 1.65; }

.finding-lede { color: var(--ink) !important; font-family: var(--serif); font-size: clamp(23px, 3vw, 34px); line-height: 1.3 !important; }
.finding-grid { display: grid; grid-template-columns: minmax(0, 1fr) 320px; gap: clamp(48px, 8vw, 96px); align-items: start; }
.finding-copy { max-width: 650px; color: var(--ink-2); font-size: 16.5px; line-height: 1.78; }
.finding-copy p + p { margin-top: 1.25em; }
.limit-panel { padding: 24px; border: 1.5px solid var(--line-2); background: var(--surface); box-shadow: inset 0 1px 0 var(--glint); }
.limit-panel h3 { margin: 13px 0 18px; }
.limit-panel ul { margin: 0; padding-left: 18px; color: var(--ink-2); font-size: 13px; line-height: 1.7; }
.limit-panel li + li { margin-top: 8px; }

.technical-record { border-top: 1.5px solid var(--line-2); border-bottom: 1.5px solid var(--line-2); }
.technical-record summary { display: flex; align-items: center; justify-content: space-between; gap: 20px; padding: 24px 0; cursor: pointer; list-style: none; }
.technical-record summary::-webkit-details-marker { display: none; }
.technical-record summary span { display: grid; gap: 5px; }
.technical-record summary b { color: var(--ink); font-family: var(--serif); font-size: 21px; font-weight: 300; }
.technical-record summary small { color: var(--ink-3); font-size: 11px; }
.technical-record summary i { width: 8px; height: 8px; border-right: 1px solid var(--ink-2); border-bottom: 1px solid var(--ink-2); transform: rotate(45deg); transition: transform 180ms var(--ease); }
.technical-record[open] summary i { transform: translateY(4px) rotate(225deg); }
.technical-body { display: grid; grid-template-columns: 1.4fr 0.8fr 0.8fr; gap: clamp(24px, 4vw, 48px); padding: 16px 0 34px; }
.technical-body h3 { margin-bottom: 13px; font-size: 18px; }
.technical-body p { color: var(--ink-2); font-size: 13px; line-height: 1.7; }
pre { margin: 16px 0 0; padding: 16px; overflow-x: auto; border: 1px solid var(--line); background: var(--surface-2); color: var(--ink-2); font-size: 11px; line-height: 1.7; white-space: pre-wrap; }
.parameter-list { margin: 0; }
.parameter-list div { display: flex; justify-content: space-between; gap: 16px; padding: 9px 0; border-bottom: 1px solid var(--line); font-size: 11px; }
.parameter-list dt { color: var(--ink-3); }
.parameter-list dd { margin: 0; color: var(--ink-2); text-align: right; }
.record-links { display: grid; grid-template-columns: repeat(2, 1fr); gap: 0 28px; margin-top: 34px; border-top: 1px solid var(--line); }
.record-links a { display: flex; justify-content: space-between; gap: 16px; padding: 16px 0; border-bottom: 1px solid var(--line); color: var(--ink-2); font-size: 12px; text-decoration: none; }
.record-links a:hover { color: var(--ink); }

.site-footer { background: #101114; color: #aeb3bb; }
.footer-inner { display: grid; grid-template-columns: 1fr auto 1fr; gap: 24px; padding: 34px 0; font: 400 10px var(--mono); letter-spacing: 0.05em; }
.footer-inner a { color: #f2f3f5; text-decoration-color: #626872; text-underline-offset: 5px; }
.footer-inner > :last-child { text-align: right; }

@media (max-width: 900px) {
  .study-id, .study-nav { display: none; }
  .hero-grid, .finding-grid { grid-template-columns: 1fr; }
  .study-facts { max-width: 620px; }
  .lab { grid-template-columns: 1fr; }
  .controls { display: grid; grid-template-columns: repeat(3, 1fr); gap: 0 22px; }
  .control-actions, .intervention, .control-note { grid-column: 1 / -1; }
  .control-note { margin-top: 0; }
  .technical-body { grid-template-columns: 1fr; }
}

@media (max-width: 700px) {
  .section-grid { grid-template-columns: 1fr; gap: 20px; }
  .section-rail { padding-top: 0; }
  .idea-steps { grid-template-columns: 1fr; }
  .idea-step > span { margin-bottom: 18px; }
  .plain-model { padding-left: 20px; }
  .split-head { display: block; }
  .lab-state { display: inline-block; margin-top: 24px; }
  .record-links { grid-template-columns: 1fr; }
  .footer-inner { grid-template-columns: 1fr; }
  .footer-inner > :last-child { text-align: left; }
}

@media (max-width: 520px) {
  .header-inner { min-height: 64px; }
  .theme-toggle { min-width: 68px; }
  .study-hero { padding-top: 72px; }
  h1 { font-size: clamp(43px, 13vw, 62px); }
  .hero-lede { font-size: 20px; }
  .controls { display: block; }
  .control-actions { display: grid; }
  .intervention { width: 100%; }
  .control-note { margin-top: 0; }
  .limit-panel { padding: 20px; }
}

@media (prefers-reduced-motion: reduce) {
  *, *::before, *::after { scroll-behavior: auto !important; transition-duration: 0.001ms !important; }
}