/* V3: editorial rhythm, layered white surfaces, and semantic color details. */
:root {
  --surface: #f7f8fa;
  --soft-line: #e8eaed;
  --card-shadow: 0 4px 8px #20212403, 0 18px 48px #20212406;
}

.nav-links a { position: relative; transition: color .18s ease; }
.nav-links a:not(.nav-paper)::after {
  content: ''; position: absolute; left: 0; right: 0; bottom: -9px;
  height: 2px; border-radius: 2px; background: var(--nav-accent, #4285F4);
  transform: scaleX(0); transform-origin: left; transition: transform .18s ease;
}
.nav-links a[href='#idea'] { --nav-accent: #FBBC04; }
.nav-links a[href='#demo'] { --nav-accent: #EA4335; }
.nav-links a[href='#results'] { --nav-accent: #34A853; }
.nav-links a:hover, .nav-links a[aria-current] { text-decoration: none; }
.nav-links a:hover::after, .nav-links a[aria-current]::after { transform: scaleX(1); }
.nav-paper, .button, .segmented, select { border-radius: 24px; }
.button {
  transition: background .18s ease, border-color .18s ease, box-shadow .18s ease, transform .18s ease;
}
.button.primary { box-shadow: none; font-weight: 550; }
.button:not(:disabled):hover { transform: translateY(-1px); box-shadow: 0 4px 12px #2021240c; }
.button.primary:not(:disabled):hover { box-shadow: 0 4px 14px #20212424; }
.button:not(:disabled):active { transform: translateY(0); }
.text-link { font-weight: 500; }
.text-link:hover { color: #1967d2; text-decoration: none; }

.hero { padding-top: 66px; }
.hero-layout { gap: 38px; }
.hero-diagram {
  padding: 22px 12px 20px; border: 1px solid #edf0f3; border-radius: 24px;
  background: white; box-shadow: var(--card-shadow);
}
.hero-diagram figcaption { padding-bottom: 13px; }
.diagram-footnote { margin-top: 12px; }
.hero-credits { border-top: 0; margin-top: 36px; padding-bottom: 29px; }
.hero-summary { color: #4b5056; }
.stats { border-color: var(--soft-line); padding: 28px 20px; }
.stat { border-color: var(--soft-line); }
.stat strong { font-size: 42px; font-weight: 450; letter-spacing: -.06em; }
.stat strong small { font-size: 15px; font-weight: 400; }
.stat p { margin-top: 9px; }

.section { padding-top: 86px; padding-bottom: 86px; border-bottom: 0; }
h2 { font-size: 42px; font-weight: 500; letter-spacing: -.045em; line-height: 1.15; }
.section-head .eyebrow { margin-bottom: 18px; font-size: 10px; }
.intro { line-height: 1.8; max-width: 730px; }
.caption { color: #626970; }

/* Observation: a short editorial introduction beside two unboxed findings. */
#idea { display: grid; grid-template-columns: .85fr 1.65fr; gap: 22px 54px; align-items: start; }
#idea .section-head { margin-bottom: 20px; }
#idea h2 { max-width: 280px; font-size: 40px; }
#idea .intro { font-size: 15px; margin: 0; }
#idea > .caption { grid-column: 1 / -1; margin: 9px 0 0; }
.observation-grid { margin: 0; gap: 34px; }
.observation, .observation.consensus {
  padding: 0; border: 0; background: transparent; border-radius: 0;
}
.observation h3 { font-size: 17px; font-weight: 550; line-height: 1.35; max-width: 230px; margin-top: 13px; }
.observation-symbol {
  display: inline-flex; align-items: center; justify-content: center; width: 34px; height: 34px;
  border-radius: 50%; background: var(--yellow-fill); color: #654000; font: 500 26px var(--mono);
}
.consensus .observation-symbol { background: var(--red-fill); color: white; }
.observation-value { display: block; margin: 17px 0 20px; }
.observation-value strong { display: block; font-size: 78px; line-height: 1.1; font-weight: 450; letter-spacing: -.075em; }
.observation-value strong .percent { font-size: .52em; font-weight: 400; margin-left: 2px; color: inherit; }
.observation-value > span { display: block; margin-top: 8px; font-size: 13px; line-height: 1.6; max-width: 215px; min-height: 42px; }
.observation p { font-size: 13px; line-height: 1.75; margin-top: 18px; color: var(--muted); }
.mini-bar { height: 5px; background: #f1f3f4; border-radius: 5px; }

/* The interactive method is a single workspace floating on a quiet surface. */
#demo { background: var(--surface); border-radius: 28px; padding: 44px 36px 35px; margin: 5px -24px 0; }
#demo .section-head { align-items: center; gap: 20px; }
#demo .intro { max-width: 730px; font-size: 15px; }
.walkthrough-label { display: inline-flex; align-items: center; gap: 10px; white-space: nowrap; font-size: 11px; color: var(--muted); }
.parallel-dots { display: inline-flex; gap: 4px; }
.parallel-dots i { width: 7px; height: 7px; background: var(--yellow-fill); border-radius: 50%; }
.parallel-dots i:last-child { background: var(--red-fill); }
.demo { border: 1px solid #e6e9ed; border-radius: 18px; background: white; box-shadow: var(--card-shadow); }
.demo-toolbar { background: white; border-bottom: 1px solid var(--soft-line); padding: 19px 24px; }
.demo-toolbar p { line-height: 1.7; }
.demo-toolbar strong { display: inline-block; padding: 2px 8px; border-radius: 5px; background: var(--blue-bg); color: #174ea6; font-size: 11px; }
.demo-body { padding: 24px; }
.stage-label { display: flex; align-items: center; gap: 9px; font-size: 12px; font-weight: 600; margin: 0 0 16px; }
.step-number { display: inline-flex; align-items: center; justify-content: center; width: 22px; height: 22px; border-radius: 50%; font: 500 10px var(--mono); flex-shrink: 0; }
.candidate-step { background: var(--blue-bg); color: #174ea6; }
.investigation-step { background: #f1f3f4; color: var(--ink); }
.delivery-step { background: #ceead6; color: var(--green); }
.stage-description { color: var(--muted); font-size: 11px; font-weight: 400; margin-left: auto; }
.investigation-stage { margin-top: 28px; }
.candidate { background: white; border: 1px solid #dce6fa; border-radius: 10px; padding: 17px; position: relative; }
.candidate::before { content: ''; display: block; width: 24px; height: 3px; background: var(--blue); border-radius: 2px; margin-bottom: 13px; }
.candidate .candidate-label { font-size: 10px; }
.candidate .amount { font-size: 21px; font-weight: 550; letter-spacing: -.02em; margin-top: 12px; }
.candidate .source, .candidate .candidate-status { color: var(--muted); }
.candidate.rejected::before { background: var(--red-fill); }
.candidate.selected::before { background: var(--green-fill); }
.branch, .branch.challenge { border: 1px solid #ece4cd; border-radius: 12px; background: white; }
.branch.challenge { border-color: #ecd8d5; }
.branch-header, .branch.challenge .branch-header { background: white; padding: 17px 17px 0; border: 0; }
.branch-header h3, .branch.challenge .branch-header h3 { color: var(--ink); font-size: 17px; font-weight: 550; }
.branch-header .icon, .branch.challenge .icon { display: inline-flex; align-items: center; justify-content: center; width: 30px; height: 30px; border-radius: 50%; flex-shrink: 0; background: var(--yellow-fill); color: #654000; font-size: 22px; font-weight: 500; }
.branch.challenge .icon { color: white; background: var(--red-fill); }
.branch-content { padding: 13px 17px 17px; }
.branch-content p { color: var(--muted); }
.evidence { background: var(--amber-bg); border: 0; border-radius: 7px; color: #66450d; padding: 13px; }
.challenge .evidence { background: var(--red-bg); border: 0; color: #783329; }
.evidence.revealed, .challenge .evidence.revealed { background: var(--green-bg); color: var(--green); }
.branch .button { border-color: #e8d7a6; background: white; padding: 9px 13px; }
.branch .button:not(:disabled):hover { background: var(--amber-bg); border-color: var(--yellow-fill); }
.challenge .button { border-color: #ebc3be; }
.challenge .button:not(:disabled):hover { background: var(--red-bg); border-color: var(--red-fill); }
.branch-note { font-size: 10px; padding: 20px 0; }
.delivery { border: 1px solid #c8dfcf; border-radius: 12px; background: #f5faf6; padding: 20px; }
.delivery .eyebrow { display: flex; align-items: center; gap: 8px; font-size: 9px; letter-spacing: .08em; }
.delivery-result { margin-top: 12px; font-weight: 500; }
.delivery.complete { border-color: var(--green-fill); }
.demo-controls { padding-top: 20px; }
.demo-controls .button { border-color: transparent; background: #f8f9fa; }

/* Results remain an open, compact comparison rather than a set of cards. */
#results { padding-top: 88px; }
#results h2 { font-size: 38px; }
.result-summary { background: white; border: 0; border-top: 1px solid var(--soft-line); border-bottom: 1px solid var(--soft-line); border-radius: 0; padding: 24px 0; margin-bottom: 25px; }
.result-summary strong { font-size: 42px; font-weight: 450; color: var(--green); letter-spacing: -.055em; }
.result-summary p { font-size: 13px; line-height: 1.8; }
.segmented { background: #f1f3f4; border-color: transparent; padding: 4px; }
.segmented button { border-radius: 20px; padding: 9px 14px; }
.segmented button[aria-pressed=true] { background: white; color: var(--ink); box-shadow: 0 1px 5px #20212418; }
.segmented button:not([aria-pressed=true]):hover { color: var(--ink); background: #e8eaed; }
.chart-group h3 { font-weight: 600; }
.chart-grid { margin: 23px 0; }
.table-details { border: 1px solid var(--soft-line); border-radius: 12px; }
.table-details summary { padding: 17px 20px; }
.table-details summary:hover { background: #f8f9fa; border-radius: 12px; }

#evolution { border-top: 1px solid var(--soft-line); }
#evolution > .intro { max-width: 740px; }
.evolution-layout { gap: 64px; margin-top: 37px; align-items: center; }
.evolution-chart { border: 1px solid var(--soft-line); border-radius: 20px; padding: 29px; box-shadow: var(--card-shadow); }
.evolution-steps li { border-bottom: 0; padding: 9px 0; align-items: flex-start; }
.evolution-steps li::before { display: inline-flex; align-items: center; justify-content: center; flex-shrink: 0; width: 25px; height: 25px; margin-top: -2px; border-radius: 50%; background: var(--red-bg); color: var(--red); }
.evolution-steps li:nth-child(2)::before { background: var(--blue-bg); color: #174ea6; }
.evolution-steps li:nth-child(3)::before { background: var(--amber-bg); color: var(--amber); }
.evolution-steps li:nth-child(4)::before { background: var(--green-bg); color: var(--green); }
.library-bars { gap: 21px; margin-top: 28px; }
.library-track { height: 18px; border-radius: 4px; }
.scope { border-top: 1px solid var(--soft-line); gap: 70px; padding-top: 45px; padding-bottom: 50px; }
.scope h3 { font-size: 24px; font-weight: 500; }
.scope p { font-size: 13px; line-height: 1.8; }
.citation { display: grid; grid-template-columns: .7fr 1.3fr; gap: 20px 48px; border-top: 1px solid var(--soft-line); padding: 50px 0; }
.citation-head { display: flex; flex-direction: column; align-items: flex-start; justify-content: flex-start; gap: 23px; margin-bottom: 0; }
.citation-head h2 { font-size: 34px; }
.citation pre { border: 0; border-radius: 16px; padding: 25px; background: #f8f9fa; font-size: 11px; }
.citation #copy-status { grid-column: 2; margin-top: 0; }
.footer-inner { border-color: var(--soft-line); }

@media(max-width:1050px) {
  #idea { gap: 22px 34px; grid-template-columns: .8fr 1.5fr; }
  #idea h2 { font-size: 34px; }
  .observation-grid { gap: 23px; }
  .observation-value strong { font-size: 64px; }
  .evolution-layout { gap: 34px; }
  .evolution-chart { padding: 23px; }
  .hero-diagram { padding-left: 6px; padding-right: 6px; }
}
@media(max-width:900px) {
  #idea { grid-template-columns: 1fr; gap: 30px; }
  #idea h2 { max-width: none; font-size: 38px; }
  .observation-intro { max-width: 680px; }
  .observation-grid { gap: 50px; }
  .observation h3 { max-width: none; }
  #demo .section-head { align-items: flex-start; }
  .stage-description { font-size: 10px; }
  .citation { grid-template-columns: 1fr; gap: 20px; }
  .citation-head { flex-direction: row; align-items: center; justify-content: space-between; }
  .citation #copy-status { grid-column: 1; }
}
@media(max-width:680px) {
  .nav-paper, .button { border-radius: 22px; }
  .hero { padding-top: 37px; }
  .hero-diagram { border-radius: 18px; padding: 17px 7px; }
  .hero-layout { gap: 29px; }
  .hero-credits { margin-top: 25px; padding-bottom: 21px; }
  .stats { padding: 22px 0; }
  .stat strong { font-size: 34px; }
  .stat strong small { font-size: 13px; }
  .section { padding-top: 53px; padding-bottom: 53px; }
  h2, #idea h2, #results h2 { font-size: 32px; }
  .section-head .eyebrow { margin-bottom: 13px; }
  #idea { gap: 28px; }
  #idea .intro { font-size: 14px; }
  .observation-grid { gap: 25px; grid-template-columns: 1fr 1fr; }
  .observation h3 { font-size: 15px; }
  .observation-value strong { font-size: 62px; }
  .observation-value > span { font-size: 12px; min-height: 58px; }
  .observation p { font-size: 12px; line-height: 1.7; }
  #demo { margin: 0 -10px; padding: 28px 13px; border-radius: 20px; }
  #demo .intro { font-size: 14px; }
  #demo h2 { font-size: 31px; }
  #demo .section-head { gap: 15px; }
  .demo-toolbar { padding: 14px; }
  .demo-body { padding: 15px 12px; }
  .demo { border-radius: 13px; }
  .stage-label { flex-wrap: wrap; font-size: 11px; gap: 7px; }
  .stage-description { width: 100%; padding-left: 29px; margin: -4px 0 0; font-size: 10px; }
  .candidate { padding: 11px 8px; }
  .candidate .candidate-label { font-size: 9px; }
  .candidate .amount { font-size: 18px; }
  .candidate .source { font-size: 10px; }
  .candidate .candidate-status { font-size: 10px; }
  .candidate::before { width: 18px; margin-bottom: 10px; }
  .branch-header, .branch.challenge .branch-header { padding: 15px 13px 0; }
  .branch-header h3, .branch.challenge .branch-header h3 { font-size: 16px; }
  .branch-content { padding: 12px 13px 14px; }
  .branch-note { font-size: 9px; }
  .delivery { padding: 16px; }
  .delivery-result { font-size: 23px; }
  #results { padding-top: 57px; }
  .result-summary { padding: 19px 0; }
  .result-summary strong { font-size: 31px; }
  .result-summary p { font-size: 12px; }
  .segmented button { font-size: 11px; padding: 8px 11px; }
  .evolution-layout { grid-template-columns: 1fr; gap: 29px; margin-top: 27px; }
  .evolution-chart { padding: 22px 18px; }
  .scope { grid-template-columns: 1fr; gap: 33px; }
  .scope h3 { font-size: 22px; }
  .citation { padding: 36px 0; }
  .citation-head h2 { font-size: 29px; }
  .citation pre { padding: 18px; font-size: 10px; }
}
@media(max-width:375px) {
  .observation-grid { gap: 19px; }
  .observation-value strong { font-size: 53px; }
  .candidate .amount { font-size: 16px; }
  .candidate .candidate-label { font-size: 8px; }
}
/* V3 readability: enlarge reading text without inflating the display headings. */
body { font-size: 18px; }
.nav-links { font-size: 15px; }
.hero-summary, #idea .intro, #demo .intro, .intro { font-size: 18px; line-height: 1.75; }
.hero-summary strong { font-size: 22px; }
.hero-credits .authors { font-size: 16px; }
.affiliations { font-size: 15px; }
.author-note { font-size: 14px; }
.eyebrow, .hero-copy .eyebrow, .section-head .eyebrow { font-size: 12px; }
.button, .button.small, .hero-copy .button, .text-link { font-size: 15px; }
.hero-diagram figcaption { font-size: 12px; flex-wrap: wrap; }
.diagram-meta { font-size: 11px; }
.diagram-title { font-size: 20px; }
.diagram-small { font-size: 15px; }
.diagram-check { font-size: 11px; letter-spacing: 0; }
.diagram-footnote { font-size: 12px; line-height: 1.6; }
.stat p, .caption { font-size: 14px; line-height: 1.75; }
.observation h3 { font-size: 20px; max-width: none; }
.observation-value > span { font-size: 16px; min-height: 52px; max-width: none; }
.observation p { font-size: 16px; }
.walkthrough-label, .demo-badge, .demo-toolbar strong { font-size: 13px; }
.demo-toolbar { flex-wrap: wrap; }
.demo-toolbar p, .branch-content p, .evolution-copy p, .scope p { font-size: 17px; line-height: 1.75; }
.stage-label { font-size: 16px; flex-wrap: wrap; }
.stage-description { font-size: 14px; }
.step-number { font-size: 12px; width: 26px; height: 26px; }
.candidate .candidate-label { font-size: 13px; gap: 8px; }
.candidate .source, .candidate .candidate-status { font-size: 15px; line-height: 1.6; }
.candidate .source { color: #3c4043; margin-top: 4px; }
.branch-header h3, .branch.challenge .branch-header h3 { font-size: 20px; }
.evidence { font-size: 14px; line-height: 1.75; overflow-wrap: anywhere; }
.branch-note, .delivery .eyebrow { font-size: 12px; }
.delivery p, .demo-controls .status, .ledger { font-size: 15px; }
.result-summary p { font-size: 16px; }
.segmented button, .legend, .axis-toggle, .axis-description { font-size: 14px; }
.chart-group h3 { font-size: 15px; min-height: 46px; }
.chart-gain { font-size: 13px; }
.plot-tick text { font-size: 13px; }
.plot-bar text { font-size: 14px; }
.plot-range { font-size: 11px; }
.table-details summary { font-size: 16px; }
table { font-size: 14px; }
td .std { font-size: 12px; }
.evolution-steps li { font-size: 16px; }
.evolution-steps li::before { font-size: 12px; }
.select-label, select, .library-note { font-size: 14px; }
.select-label { flex-wrap: wrap; }
.library-row { grid-template-columns: 165px minmax(0, 1fr) 40px; font-size: 14px; }
.library-row strong { font-size: 14px; }
.citation pre { font-size: 13px; min-width: 0; }
.footer-inner { font-size: 14px; }

@media(max-width:1050px) {
  .chart-grid { grid-template-columns: repeat(3, minmax(0, 1fr)); gap: 28px; }
  .benchmark-plot { max-width: 280px; margin: auto; }
  .library-row { grid-template-columns: minmax(0, 1fr) 40px; gap: 6px 10px; }
  .library-row > span { grid-column: 1 / -1; }
  .library-row .library-track { grid-column: 1; }
  .delivery { grid-template-columns: 1fr; }
  .delivery .button { justify-self: start; }
}
@media(max-width:760px) {
  .hero-summary, #idea .intro, #demo .intro, .intro { font-size: 17px; }
  .candidate-grid { grid-template-columns: 1fr; gap: 12px; }
  .candidate { padding: 16px 18px; }
  .candidate .amount { font-size: 21px; margin-top: 10px; }
  .candidate .candidate-status { min-height: 0; margin-top: 8px; }
  .candidate::before { margin-bottom: 10px; }
  .stage-description { width: 100%; padding-left: 35px; margin: -4px 0 0; }
  .branches { grid-template-columns: 1fr; }
  .hero-diagram figcaption { flex-direction: column; }
}
@media(max-width:680px) {
  .nav-links { font-size: 14px; gap: 12px; }
  .chart-grid { grid-template-columns: repeat(2, minmax(0, 1fr)); }
  .chart-group:last-child { max-width: none; grid-column: auto; padding-right: 0; }
  .chart-group h3 { min-height: 0; }
  .result-summary { flex-wrap: wrap; gap: 12px; }
  .segmented { flex-wrap: wrap; }
  .segmented button { font-size: 13px; }
  .delivery .button { width: 100%; }
  .observation-grid { grid-template-columns: 1fr; gap: 32px; }
  .observation-value > span { min-height: 0; }
  .observation-value strong { font-size: 68px; }
  .observation p { margin-top: 14px; }
  .hero-credits .authors { font-size: 15px; }
  .citation pre { font-size: 13px; }
}
@media(max-width:540px) {
  .chart-grid { grid-template-columns: 1fr; }
  .chart-group, .chart-group:last-child { display: block; padding-bottom: 18px; }
  .chart-group .benchmark-plot { max-width: 280px; margin: 12px auto; }
  .chart-gain { font-size: 13px; margin: 8px 0 0; }
}
@media(prefers-reduced-motion:reduce) {
  *, *::before, *::after { transition: none !important; }
}