:root {
  color-scheme: light;
  --ink: #142122;
  --muted: #566365;
  --paper: #f4f3ed;
  --white: #fffef9;
  --line: #d8ddd5;
  --dark: #101c1d;
  --dark-light: #1b2a2b;
  --lime: #d9f77a;
  --lime-deep: #a1c43d;
  --serif: "Iowan Old Style", "Baskerville", "Palatino Linotype", Georgia, serif;
  --sans: Inter, ui-sans-serif, system-ui, -apple-system, BlinkMacSystemFont, "Segoe UI", sans-serif;
  --mono: "SFMono-Regular", Consolas, "Liberation Mono", monospace;
}

* { box-sizing: border-box; }
[hidden] { display: none !important; }
html { scroll-behavior: smooth; }
body { margin: 0; background: var(--paper); color: var(--ink); font-family: var(--sans); -webkit-font-smoothing: antialiased; }
button, a { -webkit-tap-highlight-color: transparent; }
button { font: inherit; }
a { color: inherit; }
img, svg { max-width: 100%; }
::selection { color: var(--ink); background: var(--lime); }
:focus-visible { outline: 3px solid #7fab26; outline-offset: 4px; }

.shell { width: min(100% - 80px, 1240px); margin-inline: auto; }
.skip-link { position: absolute; top: -100px; left: 20px; z-index: 100; padding: 10px 16px; background: var(--lime); color: var(--ink); }
.skip-link:focus { top: 12px; }

.site-header { position: relative; z-index: 10; background: var(--dark); color: #f7faf3; border-bottom: 1px solid rgba(255,255,255,.13); }
.nav { display: flex; justify-content: space-between; align-items: center; min-height: 80px; }
.brand { display: inline-flex; align-items: center; gap: 12px; text-decoration: none; font-size: 24px; line-height: 1; font-weight: 780; letter-spacing: -.07em; }
.brand-mark { display: grid; place-items: center; width: 35px; height: 35px; border: 1px solid var(--lime); border-radius: 50%; color: var(--lime); font: 25px/1 var(--serif); letter-spacing: 0; }
.brand-dot { color: var(--lime); }
.nav-links { display: flex; align-items: center; gap: clamp(18px, 3vw, 42px); }
.nav-links a { color: #cbd6cf; text-decoration: none; font-size: 13px; font-weight: 600; transition: color .2s ease; }
.nav-links a:hover, .nav-links a:focus-visible { color: var(--lime); }
.nav-links .nav-source { color: var(--lime); }
.nav-source span { margin-left: 5px; }

.hero { position: relative; overflow: hidden; background: var(--dark); color: #f7faf3; }
.hero::before { position: absolute; inset: 0; content: ""; opacity: .32; background-image: linear-gradient(rgba(190,219,204,.07) 1px, transparent 1px), linear-gradient(90deg, rgba(190,219,204,.07) 1px, transparent 1px); background-size: 64px 64px; mask-image: linear-gradient(90deg, transparent 15%, #000 100%); pointer-events: none; }
.hero-grid { position: relative; display: grid; grid-template-columns: minmax(0, 1.1fr) minmax(390px, .9fr); gap: 6%; align-items: center; min-height: 620px; padding-block: 86px 92px; }
.hero-copy { max-width: 690px; }
.eyebrow, .section-number, .micro-label, .card-tag, .hero-art-label, .hero-art-foot, .hero-bottom, .track-top, .track-tail { font: 700 11px/1.4 var(--mono); letter-spacing: .09em; text-transform: uppercase; }
.eyebrow { display: inline-flex; align-items: center; gap: 10px; color: #bfd0c2; }
.status-light { display: inline-block; width: 7px; height: 7px; border-radius: 50%; background: var(--lime); box-shadow: 0 0 0 4px rgba(217,247,122,.1); }
h1, h2, h3, p { margin-top: 0; }
h1, h2 { letter-spacing: -.055em; }
h1 { margin: 29px 0 25px; font: 400 clamp(72px, 8.1vw, 126px)/.88 var(--serif); }
h1 em, .next-section h2 em { color: var(--lime); font-weight: 400; }
.hero-lede { max-width: 640px; margin-bottom: 18px; font-size: clamp(20px, 2vw, 27px); line-height: 1.38; letter-spacing: -.03em; }
.hero-lede strong { color: var(--lime); font-weight: 650; }
.hero-body { max-width: 590px; color: #b9c9c2; font-size: 16px; line-height: 1.7; }
.hero-actions, .closing-actions { display: flex; flex-wrap: wrap; align-items: center; gap: 29px; margin-top: 30px; }
.button { display: inline-flex; align-items: center; justify-content: space-between; gap: 28px; min-height: 53px; padding: 0 20px; text-decoration: none; font-size: 13px; font-weight: 760; transition: transform .2s ease, background .2s ease; }
.button:hover { transform: translateY(-2px); }
.button-primary { background: var(--lime); color: #142122; }
.button-primary:hover { background: #e8ffa1; }
.text-link { display: inline-flex; align-items: baseline; gap: 10px; padding-bottom: 5px; border-bottom: 1px solid currentColor; text-decoration: none; font-size: 13px; font-weight: 750; }
.text-link:hover { color: #5c790b; }
.light-link:hover { color: var(--lime); }
.hero-caveat { display: flex; align-items: baseline; gap: 9px; margin: 29px 0 0; color: #a9bab3; font-size: 12px; line-height: 1.5; }
.caveat-icon { color: var(--lime); font-size: 8px; }
.hero-art { position: relative; align-self: stretch; min-height: 465px; border: 1px solid rgba(217,247,122,.18); background: radial-gradient(circle at 38% 48%, rgba(151,186,140,.14), transparent 54%), #152425; box-shadow: 25px 25px 0 rgba(0,0,0,.1); }
.hero-art::before, .hero-art::after { position: absolute; content: ""; width: 18px; height: 18px; border-color: var(--lime); border-style: solid; opacity: .85; }
.hero-art::before { top: -1px; left: -1px; border-width: 1px 0 0 1px; }
.hero-art::after { right: -1px; bottom: -1px; border-width: 0 1px 1px 0; }
.hero-art-label { position: absolute; top: 27px; left: 27px; color: #a5b7ab; }
.hero-art svg { display: block; width: 100%; height: 100%; min-height: 465px; }
.hero-art svg text { fill: #82978b; font: 10px var(--mono); letter-spacing: .08em; }
.art-path { fill: none; stroke-width: 2; stroke-linejoin: round; stroke-linecap: round; }
.art-path.faint { stroke: #547364; opacity: .7; }
.art-path.bright { stroke: url(#heroLine); stroke-width: 2.7; }
.art-node circle { fill: #1a3030; stroke-width: 2; }
.art-node.muted circle { stroke: #718d7e; }
.art-node.middle circle { stroke: #9ab991; }
.art-node.bright-node circle { stroke: var(--lime); fill: #263c30; }
.hero-art-foot { position: absolute; bottom: 22px; left: 27px; right: 27px; display: flex; justify-content: flex-end; color: #8fa397; }
.hero-bottom { position: relative; display: grid; grid-template-columns: 1fr 2fr 1fr; align-items: center; min-height: 63px; gap: 16px; border-top: 1px solid rgba(255,255,255,.16); color: #9db0a7; }
.hero-bottom span:nth-child(2) { font: 500 16px/1.45 var(--sans); letter-spacing: 0; text-transform: none; color: #c1d0c7; }
.hero-bottom span:last-child { justify-self: end; font-size: 20px; color: var(--lime); }

.section { padding-block: 124px; }
.section-number { display: block; margin-bottom: 22px; color: #648119; }
.section-heading { display: grid; grid-template-columns: minmax(0, 1.15fr) minmax(230px, .55fr); align-items: end; column-gap: 10%; margin-bottom: 48px; }
.section-heading .section-number { grid-column: 1 / -1; }
.section-heading h2, .next-section h2, .closing h2 { margin-bottom: 0; font: 400 clamp(48px, 5.2vw, 78px)/.99 var(--serif); }
.section-heading p { max-width: 370px; margin: 0 0 6px; color: var(--muted); font-size: 16px; line-height: 1.65; }
.idea-layout { display: grid; grid-template-columns: minmax(0, 1.45fr) minmax(280px, .55fr); gap: 26px; }
.diagram-card { display: flex; flex-direction: column; min-width: 0; padding: 26px 32px 22px; border: 1px solid var(--line); background: var(--white); }
.diagram-head { display: flex; justify-content: space-between; align-items: flex-start; gap: 15px; }
.micro-label { color: #6b7771; }
.diagram-subtitle { margin: 7px 0 0; color: #78847b; font-size: 11px; line-height: 1.45; }
.diagram-controls { display: flex; flex-direction: column; align-items: flex-end; gap: 8px; }
.view-switch { display: flex; gap: 3px; padding: 4px; border: 1px solid #dfe3db; background: #eff1ea; }
.view-button { padding: 7px 10px; border: 0; background: transparent; color: #586563; cursor: pointer; font: 700 10px var(--mono); letter-spacing: .01em; white-space: nowrap; }
.view-button:hover { color: var(--ink); }
.view-button.is-active { background: var(--ink); color: white; }
.playback-note { color: #839087; font: 10px/1.4 var(--mono); }
.diagram-stage { display: grid; flex: 1; place-items: center; min-height: 333px; }
.diagram-stage svg { display: block; width: 100%; max-height: 310px; overflow: visible; }
.diagram-edge { fill: none; stroke: #a8b5aa; stroke-width: 2; stroke-linecap: round; }
.diagram-node circle { fill: #ecf2e2; stroke: #68844d; stroke-width: 2; }
.diagram-node circle:nth-child(n + 5) { fill: var(--lime); stroke: #8cae38; }
.diagram-letter text, .sequence-token { fill: #243433; text-anchor: middle; font: 17px var(--mono); }
.diagram-caption { fill: #68766a; font: 10px var(--mono); letter-spacing: .06em; }
.sequence-lane { fill: #f5f7f1; stroke: #dce4d8; stroke-width: 1; }
.sequence-index { fill: #7f8e83; font: 10px var(--mono); }
.sequence-connector { fill: none; stroke: #a6b3a9; stroke-width: 2; stroke-linecap: round; }
.prefix-node { fill: #ebf2e3; stroke: #b5c7a5; stroke-width: 1.5; }
.ending-node { fill: var(--lime); stroke: #9dbc41; stroke-width: 1.5; }
.diagram-explanation { margin: 4px 0 0; padding-top: 20px; border-top: 1px solid var(--line); color: #4c5a54; font-size: 14px; line-height: 1.6; }
.diagram-explanation strong { color: var(--ink); }
.idea-aside { display: flex; flex-direction: column; padding: 33px; background: #e8ede3; }
.idea-aside > p:first-of-type { margin: 34px 0 25px; font: 400 clamp(22px, 2.2vw, 30px)/1.25 var(--serif); letter-spacing: -.025em; }
.equation { padding: 22px 8px 23px; border-block: 1px solid #c9d6c1; color: #355217; text-align: center; font: 400 clamp(25px, 2.8vw, 39px)/1.3 var(--serif); white-space: nowrap; }
.equation sub { font-size: 50%; }
.idea-aside .aside-note { margin: 22px 0 30px; color: #57675a; font-size: 13px; line-height: 1.65; }
.idea-aside .text-link { align-self: flex-start; margin-top: auto; }

.advantage-section { color: #f5f8ee; background: var(--dark); }
.advantage-section .section-number { color: var(--lime); }
.advantage-heading p { color: #b8c9c0; }
.advantage-grid { display: grid; grid-template-columns: repeat(2, minmax(0, 1fr)); gap: 18px; }
.advantage-card { display: flex; flex-direction: column; min-height: 440px; padding: 34px 36px; border: 1px solid #42534a; background: #182929; }
.advantage-card .micro-label, .advantage-profile .micro-label { color: var(--lime); }
.advantage-card h3 { margin: 55px 0 18px; font: 400 clamp(35px, 3.5vw, 52px)/1.03 var(--serif); letter-spacing: -.05em; }
.advantage-card > p { max-width: 520px; margin-bottom: 30px; color: #b7c8bf; font-size: 15px; line-height: 1.7; }
.advantage-trade { display: grid; grid-template-columns: 1fr 1fr; gap: 18px; margin-top: auto; padding-top: 22px; border-top: 1px solid #405151; }
.advantage-trade span { color: #bbcac0; font-size: 12px; line-height: 1.5; }
.advantage-trade strong { display: block; margin-bottom: 7px; color: var(--lime); font: 700 10px var(--mono); letter-spacing: .06em; text-transform: uppercase; }
.advantage-stat { display: flex; align-items: center; gap: 20px; margin-top: auto; padding-top: 22px; border-top: 1px solid #405151; }
.advantage-stat strong { color: var(--lime); font: 400 55px/.9 var(--serif); letter-spacing: -.055em; white-space: nowrap; }
.advantage-stat span { max-width: 270px; color: #bbcac0; font-size: 12px; line-height: 1.5; }
.advantage-profile { display: grid; grid-template-columns: minmax(210px, .7fr) minmax(0, 1.3fr); gap: 36px; align-items: center; margin-top: 18px; padding: 28px 36px; background: #253935; }
.advantage-profile p { margin: 9px 0 0; color: #cbd9d0; font-size: 14px; line-height: 1.55; }
.profile-values { display: grid; grid-template-columns: repeat(3, minmax(0, 1fr)); gap: 16px; }
.profile-values span { color: #b9c9c0; font: 10px/1.4 var(--mono); }
.profile-values strong { display: block; margin-bottom: 8px; color: #f5f8ee; font: 400 39px/1 var(--serif); letter-spacing: -.05em; }
.advantage-hypothesis { margin: 24px 0 0; color: #e0e9d9; font-size: 15px; line-height: 1.65; }
.advantage-hypothesis strong { color: var(--lime); }
.advantage-note { margin: 12px 0 0; color: #a9bbb0; font-size: 15px; line-height: 1.65; }
.advantage-note a { color: var(--lime); text-underline-offset: 3px; }

.evidence-section { background: #e9ede6; }
.evidence-heading { margin-bottom: 53px; }
.evidence-grid { display: grid; grid-template-columns: repeat(3, minmax(0, 1fr)); gap: 16px; }
.evidence-card { display: flex; flex-direction: column; min-height: 510px; padding: 28px; background: var(--white); border-top: 3px solid #bdd45b; }
.card-top { display: flex; align-items: center; justify-content: space-between; gap: 10px; margin-bottom: 38px; }
.card-index { color: #86a337; font: 400 32px/.9 var(--serif); }
.card-tag { color: #6b786d; font-size: 9px; text-align: right; }
.evidence-card h3 { margin-bottom: 20px; font: 400 clamp(27px, 2.5vw, 36px)/1.08 var(--serif); letter-spacing: -.04em; }
.evidence-card > p { color: #52605b; font-size: 14px; line-height: 1.7; }
.challenge-outlook { margin-top: auto; padding: 20px 0 3px; border-top: 1px solid var(--line); }
.challenge-outlook .micro-label { color: #6e8929; }
.challenge-outlook p { margin: 11px 0 0; color: #52605b; font-size: 13px; line-height: 1.6; }
.challenge-outlook a { color: #375a19; text-underline-offset: 3px; }
.card-link { display: flex; justify-content: space-between; margin-top: 17px; padding-top: 18px; border-top: 1px solid var(--line); text-decoration: none; font-size: 12px; font-weight: 700; }
.card-link:hover { color: #5e7c13; }
.tracks-section { padding-bottom: 128px; }
.track-grid { display: grid; grid-template-columns: 1fr 1fr; gap: 19px; }
.track-card { display: flex; flex-direction: column; min-height: 345px; padding: 30px 36px 28px; border: 1px solid #d0d8cd; background: var(--white); text-decoration: none; transition: border .2s ease, transform .2s ease, box-shadow .2s ease; }
.track-card:hover { border-color: #8cae38; transform: translateY(-3px); box-shadow: 0 16px 35px rgba(22,40,33,.07); }
.track-top { display: flex; justify-content: space-between; color: #698321; }
.track-top span:last-child { font-size: 17px; }
.track-card h3 { margin: 58px 0 14px; font: 400 clamp(37px, 3.5vw, 52px)/1 var(--serif); letter-spacing: -.05em; }
.track-card p { max-width: 470px; color: #566560; font-size: 14px; line-height: 1.7; }
.track-tail { margin-top: auto; padding-top: 30px; color: #839187; font-size: 10px; }
.tracks-principle { display: grid; grid-template-columns: minmax(150px, .35fr) minmax(0, 1fr); gap: 25px; align-items: start; margin-top: 19px; padding: 26px 30px; background: #e9ede6; }
.tracks-principle .micro-label { color: #698321; }
.tracks-principle-body { display: flex; align-items: center; justify-content: space-between; gap: 32px; }
.tracks-principle p { max-width: 620px; margin: 0; color: #4e6055; font-size: 14px; line-height: 1.65; }
.tracks-equation { flex: none; color: #26372d; font: 400 25px/1.25 var(--serif); white-space: nowrap; }
.tracks-equation sub { font-size: .58em; }
.tracks-note { margin: 24px 0 0; color: #65736a; font-size: 13px; line-height: 1.6; }
.tracks-note a { text-underline-offset: 3px; }

.next-section { color: #f5f8ee; background: var(--dark); }
.next-layout { display: grid; grid-template-columns: minmax(280px, .85fr) minmax(0, 1.15fr); gap: 12%; }
.next-section .section-number { color: var(--lime); }
.next-section h2 { margin: 0 0 28px; }
.next-layout > div > p { max-width: 460px; color: #b5c6ba; font-size: 16px; line-height: 1.7; }
.next-list { margin: 0; padding: 0; list-style: none; }
.next-list li { display: grid; grid-template-columns: 36px 1fr; gap: 22px; padding: 20px 0 22px; border-top: 1px solid #405151; }
.next-list li:last-child { border-bottom: 1px solid #405151; }
.next-list li > span { padding-top: 4px; color: var(--lime); font: 700 12px var(--mono); }
.next-list h3 { margin: 0 0 7px; font: 500 20px/1.25 var(--sans); letter-spacing: -.025em; }
.next-list p { max-width: 520px; margin: 0; color: #acbdb4; font-size: 13px; line-height: 1.6; }

.closing { padding-block: 128px; text-align: center; }
.closing .section-number { margin-bottom: 25px; }
.closing h2 { margin-bottom: 22px; }
.closing > p { max-width: 540px; margin-inline: auto; color: #52615a; line-height: 1.65; }
.closing-actions { justify-content: center; }
.button-dark { color: #f7faf3; background: var(--ink); }
.button-dark:hover { background: #304845; }

.site-footer { padding-block: 48px; background: #e7ebe2; border-top: 1px solid #d5dcd1; }
.footer-layout { display: grid; grid-template-columns: 1fr auto auto; gap: 8%; align-items: end; }
.footer-brand { color: var(--ink); }
.footer-brand .brand-mark { color: #567b15; border-color: #7fa23b; }
.footer-brand .brand-dot { color: #7fa23b; }
.footer-layout p { margin: 19px 0 0; color: #67746c; font-size: 12px; line-height: 1.55; }
.footer-links { display: flex; gap: 22px; }
.footer-links a { color: #45564b; text-decoration: none; font-size: 12px; font-weight: 700; }
.footer-links a:hover { text-decoration: underline; }
.footer-credit { color: #758178; font-size: 11px; line-height: 1.7; text-align: right; }

@media (max-width: 1080px) {
  .hero-grid { grid-template-columns: 1fr 370px; gap: 24px; }
  h1 { font-size: clamp(66px, 7.4vw, 96px); }
  .section-heading { column-gap: 5%; }
  .idea-layout { grid-template-columns: 1fr .7fr; }
  .diagram-card { padding-inline: 20px; }
  .evidence-card { padding: 22px; }
}

@media (max-width: 820px) {
  .shell { width: min(100% - 42px, 720px); }
  .nav { min-height: 70px; }
  .nav-links { gap: 18px; }
  .nav-links a:not(.nav-source) { display: none; }
  .hero-grid { grid-template-columns: 1fr; gap: 54px; padding-block: 70px 60px; }
  .hero-art { min-height: 330px; box-shadow: none; }
  .hero-art svg { height: 355px; min-height: 355px; }
  .hero-art-label { top: 10px; left: 18px; }
  .hero-art-foot { right: 18px; bottom: 9px; }
  .hero-bottom { grid-template-columns: minmax(0, 1fr) auto; gap: 8px 16px; padding-block: 18px; }
  .hero-bottom span:first-child { grid-column: 1 / -1; }
  .hero-bottom span:nth-child(2) { grid-column: 1; display: block; font-size: 15px; }
  .hero-bottom span:last-child { grid-column: 2; grid-row: 2; align-self: end; }
  .section { padding-block: 85px; }
  .section-heading, .idea-layout, .next-layout { grid-template-columns: 1fr; }
  .section-heading { gap: 20px; }
  .section-heading .section-number { margin-bottom: 0; }
  .section-heading p { max-width: 620px; margin: 0; }
  .idea-layout { gap: 16px; }
  .idea-aside { min-height: 320px; }
  .idea-aside > p:first-of-type { margin-top: 23px; }
  .advantage-grid, .advantage-profile { grid-template-columns: 1fr; }
  .advantage-card { min-height: 0; }
  .advantage-profile { gap: 22px; }
  .evidence-grid { grid-template-columns: 1fr; }
  .evidence-card { min-height: 370px; padding: 29px; }
  .card-top { margin-bottom: 30px; }
  .evidence-card h3 { max-width: none; }
  .track-grid { gap: 13px; }
  .track-card { min-height: 360px; padding: 26px; }
  .next-layout { gap: 42px; }
  .footer-layout { grid-template-columns: 1fr auto; }
  .footer-credit { grid-column: 1 / -1; text-align: left; }
}

@media (max-width: 560px) {
  .shell { width: min(100% - 32px, 470px); }
  .brand { font-size: 22px; }
  h1 { font-size: clamp(60px, 15vw, 88px); }
  .hero-grid { padding-top: 58px; gap: 44px; }
  .hero-lede { font-size: 21px; }
  .hero-body { font-size: 15px; }
  .hero-actions { align-items: flex-start; flex-direction: column; gap: 19px; }
  .hero-art { min-height: 300px; }
  .hero-art svg { min-height: 300px; height: 300px; }
  .section-heading h2, .next-section h2, .closing h2 { font-size: clamp(45px, 11vw, 63px); }
  .diagram-head { align-items: flex-start; flex-direction: column; }
  .diagram-controls { align-items: flex-start; }
  .diagram-card { padding: 21px 18px; }
  .diagram-stage { min-height: 240px; }
  .diagram-stage svg { max-height: 240px; }
  .diagram-letter text, .sequence-token { font-size: 27px; }
  .diagram-caption, .sequence-index { font-size: 22px; }
  .diagram-explanation { font-size: 13px; }
  .idea-aside { padding: 27px; }
  .advantage-card { padding: 28px; }
  .advantage-card h3 { margin-top: 38px; }
  .advantage-profile { padding: 26px; }
  .profile-values { gap: 12px; }
  .profile-values strong { font-size: 32px; }
  .evidence-card { padding: 24px; }
  .track-grid { grid-template-columns: 1fr; }
  .track-card { min-height: 310px; }
  .track-card h3 { margin-top: 45px; }
  .tracks-principle { grid-template-columns: 1fr; gap: 14px; padding: 24px; }
  .tracks-principle-body { align-items: flex-start; flex-direction: column; gap: 18px; }
  .closing { padding-block: 90px; }
  .closing-actions { align-items: center; flex-direction: column; gap: 22px; }
  .footer-layout { grid-template-columns: 1fr; gap: 36px; }
  .footer-links { flex-wrap: wrap; }
  .footer-credit { grid-column: auto; }
}

@media (prefers-reduced-motion: reduce) {
  html { scroll-behavior: auto; }
  *, *::before, *::after { transition-duration: .01ms !important; animation-duration: .01ms !important; }
}