:root {
  /* Type scale shared with the HOTSPOT project site */
  --text-2xs: 0.74rem;
  --text-xs: 0.84rem;
  --text-sm: 0.96rem;
  --text-base: 1rem;
  --text-lg: 1.18rem;
  --text-xl: 1.55rem;
  --text-2xl: clamp(2.2rem, 3.2vw, 3.2rem);
  --text-hero: clamp(2.6rem, 4.8vw, 4.3rem);
  --ink: #071b22;
  --ink-2: #102d35;
  --paper: #f6f2e8;
  --paper-2: #ece5d6;
  --white: #fffef9;
  --copper: #d27b45;
  --copper-dark: #914624;
  --gold: #e8bb63;
  --teal: #1b9b91;
  --teal-dark: #0e625f;
  --purple: #7563a9;
  --muted: #5d696c;
  --line: rgba(7, 27, 34, .17);
  --shadow: 0 20px 60px rgba(7, 27, 34, .13);
  --sans: "IBM Plex Sans Variable", "IBM Plex Sans", -apple-system, BlinkMacSystemFont, "Segoe UI", sans-serif;
  --mono: "SFMono-Regular", Consolas, "Liberation Mono", monospace;
  --max: 1320px;
  --header-height: 72px;
}

* { box-sizing: border-box; }
html { scroll-behavior: smooth; }
body { margin: 0; background: var(--paper); color: var(--ink); font: var(--text-base)/1.55 var(--sans); font-optical-sizing: auto; -webkit-font-smoothing: antialiased; }
body.menu-open { overflow: hidden; }
a { color: inherit; text-decoration-thickness: .08em; text-underline-offset: .18em; }
button, input { color: inherit; font: inherit; }
img, svg { display: block; max-width: 100%; }
figure, blockquote { margin: 0; }
p { margin: 0 0 1em; }
h1, h2, h3 { margin-top: 0; font-weight: 500; line-height: 1.06; letter-spacing: -.035em; }
h1 { font-size: var(--text-hero); font-weight: 500; }
h2 { font-size: var(--text-2xl); font-weight: 500; }
h3 { font-size: var(--text-lg); letter-spacing: -.018em; }
code, .mono { font-family: var(--mono); }
.math-inline { display: inline-block; margin: 0; vertical-align: baseline; white-space: nowrap; letter-spacing: normal; text-transform: none; }
.math-inline .katex { font-size: 1em; }
.table-math { display: inline-block; max-width: 100%; overflow-x: auto; padding: 2px 0; vertical-align: middle; }

:focus-visible { outline: 3px solid var(--gold); outline-offset: 4px; }
.skip-link { position: fixed; z-index: 1000; top: 12px; left: 12px; padding: 10px 16px; transform: translateY(-160%); background: var(--gold); color: var(--ink); font-weight: 700; }
.skip-link:focus { transform: none; }

.site-header { position: sticky; z-index: 50; top: 0; min-height: var(--header-height); padding: 0 clamp(20px, 4vw, 64px); display: flex; align-items: center; gap: 24px; border-bottom: 1px solid var(--line); background: rgba(251, 248, 244, .96); color: var(--ink); backdrop-filter: blur(18px); box-shadow: 0 8px 28px rgba(7, 27, 34, .045); }
.brand { display: flex; align-items: center; gap: 12px; flex-shrink: 0; text-decoration: none; }
.brand > span:last-child { display: flex; flex-direction: column; }
.brand strong { font-size: var(--text-sm); font-weight: 600; letter-spacing: -.012em; line-height: 1.15; }
.brand small { margin-top: 3px; color: #756f78; font-size: var(--text-xs); letter-spacing: .005em; line-height: 1.2; }
.brand-icon { width: 48px; height: 48px; flex: 0 0 48px; }
.site-nav { min-height: var(--header-height); margin: 0 auto; display: flex; align-items: stretch; gap: 0; }
.site-nav a { position: relative; padding: 0 clamp(10px, 1.15vw, 16px); display: flex; align-items: center; color: #68616c; font-size: var(--text-xs); font-weight: 600; text-decoration: none; white-space: nowrap; transition: color .18s ease, background .18s ease; }
.site-nav a:hover { background: rgba(255,255,255,.72); color: var(--ink); }
.site-nav a[aria-current="page"] { color: var(--ink); box-shadow: inset 0 -3px var(--purple); }
.site-nav a.resource-start { margin-left: 6px; padding-left: 22px; border-left: 1px solid var(--line); }
.site-nav a.resource-nav { color: #6f5f78; }
.site-nav a.resource-nav:hover, .site-nav a.resource-nav[aria-current="page"] { color: #4f3560; }
.repo-link { padding: 8px 14px; border: 1px solid var(--line); border-radius: 999px; background: rgba(255,255,255,.65); color: var(--ink); font-size: var(--text-xs); font-weight: 600; text-decoration: none; white-space: nowrap; }
.repo-link:hover { border-color: var(--purple); color: #4f3560; }
.menu-toggle { display: none; margin-left: auto; padding: 8px 13px; border: 1px solid var(--line); border-radius: 999px; background: var(--white); color: var(--ink); font-size: var(--text-xs); font-weight: 600; }

.hero { position: relative; overflow: hidden; background: var(--ink); color: var(--white); }
.hero::before { content: ""; position: absolute; inset: 0; opacity: .16; background-image: linear-gradient(rgba(255,255,255,.15) 1px, transparent 1px), linear-gradient(90deg, rgba(255,255,255,.15) 1px, transparent 1px); background-size: 44px 44px; mask-image: linear-gradient(90deg, #000, transparent 78%); }
.hero-grid { position: relative; z-index: 1; width: min(var(--max), calc(100% - 40px)); margin: auto; padding: clamp(56px, 7vw, 84px) 0; display: grid; grid-template-columns: minmax(0, 1fr); gap: clamp(46px, 6vw, 72px); align-items: start; }
.hero-copy { max-width: 1040px; }
.eyebrow, .kicker, .section-index { display: flex; align-items: center; gap: 10px; color: var(--copper-dark); font-family: var(--sans); font-size: var(--text-xs); font-weight: 700; letter-spacing: .075em; line-height: 1.35; text-transform: uppercase; }
.hero .eyebrow { color: var(--gold); }
.eyebrow::before, .kicker::before { content: ""; width: 28px; height: 2px; background: currentColor; }
.hero h1 { max-width: 840px; margin: 24px 0 28px; }
.hero h1 em { color: var(--gold); font-style: normal; }
.hero-summary { max-width: 760px; color: #c9d7d8; font-size: var(--text-lg); line-height: 1.55; }
.authors { max-width: 760px; margin-top: 22px; color: #e8eeee; font-size: var(--text-xs); font-weight: 600; }
.actions { display: flex; flex-wrap: wrap; gap: 12px; margin-top: 32px; }
.button { min-height: 50px; padding: 0 20px; display: inline-flex; align-items: center; justify-content: center; gap: 8px; border: 1px solid var(--ink); border-radius: 999px; background: transparent; font-size: var(--text-sm); font-weight: 700; text-decoration: none; transition: transform .2s ease, background .2s ease; }
.button:hover { transform: translateY(-2px); }
.button-primary { border-color: var(--gold); background: var(--gold); color: var(--ink); }
.button-secondary { border-color: rgba(255,255,255,.4); color: #fff; }
.button-dark { background: var(--ink); color: #fff; }

.hero-visual { position: relative; width: 100%; padding: 16px; border: 1px solid rgba(255,255,255,.22); background: rgba(255,255,255,.06); box-shadow: 0 38px 80px rgba(0,0,0,.3); }
.hero-visual::before { content: "MEASURED SILICON · 0.8 V · OPEN FULL-RESOLUTION FIGURE ↗"; position: static; margin-bottom: 12px; padding: 6px 9px; display: inline-flex; background: var(--gold); color: var(--ink); font: 700 var(--text-2xs)/1.2 var(--sans); letter-spacing: .06em; }
.hero-figure-link { display: block; background: #fff; }
.hero-figure-link img { width: 100%; height: auto; object-fit: contain; background: #fff; }
.visual-caption { margin: 12px 2px 0; display: flex; justify-content: space-between; gap: 16px; color: #b9cacc; font: var(--text-xs)/1.4 var(--sans); }
.hero-project-mark { position: absolute; z-index: 3; top: -36px; right: 24px; padding: 7px 15px 7px 7px; display: flex; align-items: center; gap: 11px; border: 1px solid rgba(7,27,34,.12); border-radius: 999px; background: var(--white); color: var(--ink); box-shadow: 0 18px 42px rgba(0,0,0,.2); }
.hero-project-mark img { width: 62px; height: 62px; flex: 0 0 62px; }
.hero-project-mark span { display: flex; flex-direction: column; }
.hero-project-mark strong { font-size: var(--text-xs); font-weight: 600; line-height: 1.15; }
.hero-project-mark small { margin-top: 4px; color: var(--muted); font-size: var(--text-2xs); line-height: 1.2; }

.metric-rail { position: relative; z-index: 2; display: grid; grid-template-columns: repeat(5, 1fr); border-top: 1px solid rgba(255,255,255,.13); background: #0a222a; }
.metric-rail article { min-height: 142px; padding: 28px clamp(18px, 3vw, 42px); border-right: 1px solid rgba(255,255,255,.13); }
.metric-rail strong { display: block; color: var(--gold); font-size: var(--text-2xl); line-height: 1; letter-spacing: -.045em; }
.metric-rail strong small { font-size: .45em; letter-spacing: 0; }
.metric-rail article > span { display: block; margin-top: 10px; color: #b8c9cb; font-size: var(--text-xs); line-height: 1.4; }

.page-hero { padding: clamp(80px, 10vw, 140px) max(20px, calc((100vw - var(--max)) / 2)); border-bottom: 1px solid var(--line); background: var(--ink); color: #fff; }
.page-hero h1 { max-width: 1060px; margin: 22px 0 24px; font-size: var(--text-2xl); }
.page-hero > p:not(.eyebrow) { max-width: 820px; color: #c8d5d7; font-size: var(--text-lg); }
.page-hero .breadcrumb { margin-bottom: 32px; color: #9fb6b8; font: var(--text-xs) var(--sans); letter-spacing: .06em; text-transform: uppercase; }

.section { padding: clamp(72px, 8vw, 104px) max(20px, calc((100vw - var(--max)) / 2)); scroll-margin-top: 138px; }
.section + .section { border-top: 1px solid var(--line); }
.section-dark { background: var(--ink); color: #fff; }
.section-teal { background: var(--teal-dark); color: #fff; }
.section-white { background: var(--white); }
.section-head { max-width: 920px; margin-bottom: clamp(38px, 5vw, 72px); }
.section-head h2 { margin: 14px 0 22px; }
.section-head > p { max-width: 780px; color: var(--muted); font-size: var(--text-base); }
.section-dark .section-head > p, .section-teal .section-head > p { color: #c5d4d5; }
.section-dark .kicker, .section-teal .kicker { color: var(--gold); }

.two-col { display: grid; grid-template-columns: repeat(2, minmax(0, 1fr)); gap: clamp(36px, 6vw, 90px); align-items: start; }
.three-col { display: grid; grid-template-columns: repeat(3, minmax(0, 1fr)); gap: 18px; }
.four-col { display: grid; grid-template-columns: repeat(4, minmax(0, 1fr)); gap: 16px; }
.card { padding: clamp(24px, 3vw, 38px); border: 1px solid var(--line); background: rgba(255,255,255,.56); }
.section-dark .card, .section-teal .card { border-color: rgba(255,255,255,.17); background: rgba(255,255,255,.055); }
.card .number { display: block; margin-bottom: 30px; color: var(--copper-dark); font: 700 var(--text-xs) var(--mono); }
.section-dark .card .number, .section-teal .card .number { color: var(--gold); }
.card h3 { margin-bottom: 14px; }
.card p:last-child { margin-bottom: 0; }
.muted { color: var(--muted); }
.section-dark .muted, .section-teal .muted { color: #b9cbcc; }

.research-chain { display: grid; grid-template-columns: repeat(5, 1fr); border: 1px solid var(--line); }
.research-chain.chain-stages { grid-template-columns: repeat(4, 1fr); }
.research-chain article { position: relative; min-height: 310px; padding: 28px 24px; border-right: 1px solid var(--line); background: var(--white); }
.research-chain article:last-child { border: 0; }
.research-chain article::after { content: "→"; position: absolute; z-index: 2; top: 26px; right: -13px; width: 26px; height: 26px; display: grid; place-items: center; background: var(--copper); color: #fff; font-weight: 700; }
.research-chain article:last-child::after { display: none; }
.research-chain .step { color: var(--copper-dark); font: 700 var(--text-xs) var(--mono); }
.research-chain h3 { margin: 54px 0 14px; }
.research-chain p { color: var(--muted); font-size: var(--text-sm); }

.figure-frame { overflow: hidden; border: 1px solid var(--line); background: #fff; box-shadow: var(--shadow); }
.figure-frame img { width: 100%; height: auto; }
.figure-frame figcaption { padding: 18px 20px; border-top: 1px solid var(--line); color: var(--muted); font-size: var(--text-sm); line-height: 1.55; }
.figure-frame figcaption strong { color: var(--ink); }
.section-dark .figure-frame { border-color: rgba(255,255,255,.18); }
.figure-wide { margin-top: 42px; }
.figure-compact { width: min(100%, 680px); margin: 42px auto 0; }

.callout { padding: clamp(28px, 4vw, 48px); border-left: 6px solid var(--copper); background: var(--paper-2); }
.callout strong { display: block; margin-bottom: 8px; font-size: var(--text-lg); }
.callout p:last-child { margin-bottom: 0; }
.section-dark .callout { background: rgba(255,255,255,.07); border-color: var(--gold); }

.equation { margin: 28px 0; padding: 24px; overflow-x: auto; border: 1px solid var(--line); background: var(--ink); color: #fff; font-size: var(--text-lg); line-height: 1.45; text-align: center; }
.equation .katex { font-size: 1em; }
.equation .katex-display { margin: 0; }
.equation .alpha { color: #cbbbef; }
.equation .gamma { color: var(--gold); }
.equation .theta { color: #74ddd1; }
.legend-buttons { display: flex; flex-wrap: wrap; gap: 9px; }
.legend-buttons button, .filter-bar button { padding: 9px 13px; border: 1px solid var(--line); background: var(--white); color: var(--ink); font: 700 var(--text-xs) var(--sans); cursor: pointer; }
.legend-buttons button[aria-pressed="true"], .filter-bar button[aria-pressed="true"] { border-color: var(--ink); background: var(--ink); color: #fff; }
.equation-readout { min-height: 82px; margin-top: 18px; color: var(--muted); }
/* Dark sections use translucent panels and a gold selected state, never a
   white fill. The pressed chip matches .signal-lane.sec-on, which sits in the
   same section, and the unselected chips match its other panels. */
.section-dark .legend-buttons button { border-color: rgba(255,255,255,.2); background: rgba(255,255,255,.055); color: #fff; }
.section-dark .legend-buttons button[aria-pressed="true"] { border-color: rgba(232,187,99,.65); background: rgba(232,187,99,.08); color: var(--gold); }

.spec-table { width: 100%; border-collapse: collapse; background: var(--white); font-size: var(--text-sm); }
.spec-table th, .spec-table td { padding: 15px 18px; border-bottom: 1px solid var(--line); text-align: left; vertical-align: top; }
.spec-table th { width: 35%; color: var(--muted); font: 700 var(--text-xs) var(--sans); letter-spacing: .045em; text-transform: uppercase; }
.spec-table tr:last-child th, .spec-table tr:last-child td { border-bottom: 0; }

.phase-list { counter-reset: phase; display: grid; gap: 0; border-top: 1px solid var(--line); }
.phase { counter-increment: phase; display: grid; grid-template-columns: 120px minmax(220px, .7fr) 1.3fr; gap: 28px; padding: 38px 0; border-bottom: 1px solid var(--line); }
.phase::before { content: counter(phase, decimal-leading-zero); color: var(--copper-dark); font: 700 var(--text-xs) var(--sans); }
.phase h3 { margin: 0; }
.phase p { margin: 0; color: var(--muted); }
.gate { display: inline-block; margin-top: 12px; padding: 5px 8px; border: 1px solid var(--line); color: var(--teal-dark); font: 700 var(--text-2xs) var(--sans); letter-spacing: .04em; text-transform: uppercase; }

.stack { display: grid; grid-template-columns: repeat(4, 1fr); gap: 12px; align-items: stretch; }
.stack article { position: relative; padding: 30px 24px; border: 1px solid var(--line); background: var(--white); }
.stack article::after { content: "→"; position: absolute; top: 50%; right: -18px; z-index: 2; transform: translateY(-50%); color: var(--copper-dark); font-size: var(--text-xl); font-weight: 700; }
.stack article:last-child::after { display: none; }
.stack code { color: var(--copper-dark); font-size: var(--text-xs); }
.stack h3 { margin: 14px 0 8px; }
.stack p { margin: 0; color: var(--muted); font-size: var(--text-xs); }
.stack-return { margin-top: 12px; padding: 14px 20px; display: flex; align-items: center; justify-content: flex-end; gap: 22px; border: 1px solid var(--line); background: var(--paper-2); text-align: right; }
.stack-return span { flex: 0 0 auto; color: var(--copper-dark); font: 700 var(--text-2xs) var(--sans); letter-spacing: .07em; text-transform: uppercase; }
.stack-return strong { font: 700 var(--text-xs)/1.5 var(--sans); }

.checklist { margin: 0; padding: 0; list-style: none; }
.checklist li { position: relative; padding: 14px 0 14px 32px; border-bottom: 1px solid var(--line); }
.checklist li::before { content: "✓"; position: absolute; left: 0; color: var(--teal-dark); font-weight: 700; }
.checklist li:last-child { border: 0; }
.risk-list li::before { content: "!"; color: var(--copper-dark); }

.protocol-calculator { padding: clamp(28px, 4vw, 48px); border: 1px solid rgba(255,255,255,.2); background: rgba(255,255,255,.06); }
.calculator-grid { display: grid; grid-template-columns: repeat(4, 1fr); gap: 14px; }
.calculator-grid label { color: #bad0d2; font: 700 var(--text-xs) var(--sans); }
.calculator-grid input { width: 100%; margin-top: 8px; padding: 13px; border: 1px solid rgba(255,255,255,.3); background: var(--ink); color: #fff; }
.calculator-output { margin-top: 28px; padding-top: 24px; display: grid; grid-template-columns: repeat(3, 1fr); gap: 20px; border-top: 1px solid rgba(255,255,255,.17); }
.calculator-output strong { display: block; color: var(--gold); font-size: var(--text-2xl); line-height: 1; }
.calculator-output span { display: block; margin-top: 8px; color: #bfd0d2; font-size: var(--text-xs); }
.calculator-expression { margin: 24px 0 0; padding: 13px 16px; overflow-x: auto; border: 1px solid rgba(232,187,99,.28); background: rgba(232,187,99,.08); color: #f3dfb5; font-size: var(--text-xs); line-height: 1.5; text-align: center; }
.calculator-expression .katex-display { margin: 0; }

.result-grid { display: grid; grid-template-columns: repeat(4, 1fr); gap: 1px; background: var(--line); border: 1px solid var(--line); }
.result-grid article { padding: 32px 26px; background: var(--white); }
.result-grid strong { display: block; color: var(--teal-dark); font-size: var(--text-2xl); line-height: 1; letter-spacing: -.045em; }
.result-grid span { display: block; margin-top: 12px; color: var(--muted); font-size: var(--text-xs); }
.claim-badge { display: inline-block; margin-bottom: 16px; padding: 5px 8px; background: var(--paper-2); color: var(--copper-dark); font: 700 var(--text-2xs) var(--sans); letter-spacing: .06em; text-transform: uppercase; }

.result-story-grid { display: grid; grid-template-columns: repeat(2, minmax(0, 1fr)); gap: 1px; border: 1px solid var(--line); background: var(--line); }
.result-panel { min-height: 330px; padding: clamp(26px, 3.5vw, 44px); display: flex; flex-direction: column; background: var(--white); }
.result-panel h3 { margin: 2px 0 32px; }
.result-panel p { max-width: 590px; margin: auto 0 0; padding-top: 28px; color: var(--muted); font-size: var(--text-sm); }
.pair-value { min-height: 88px; display: grid; grid-template-columns: minmax(0, 1fr) auto minmax(0, 1fr); gap: clamp(12px, 2vw, 26px); align-items: center; }
.pair-value strong { color: var(--teal-dark); font-size: var(--text-2xl); font-weight: 700; line-height: .92; letter-spacing: -.055em; }
.pair-value strong:last-child { text-align: right; }
.pair-value strong small { font-size: .32em; letter-spacing: 0; }
.pair-value b { color: var(--copper-dark); font: 700 var(--text-xl)/1 var(--sans); }
.pair-value .text-arrow { padding: 7px 9px; border: 1px solid var(--line); color: var(--copper-dark); font-size: var(--text-2xs); letter-spacing: .06em; text-transform: uppercase; }
.pair-value .text-arrow + strong { font-size: var(--text-xl); letter-spacing: -.035em; }

.accuracy-chart { display: grid; gap: 14px; }
.accuracy-chart article { display: grid; grid-template-columns: minmax(155px, .26fr) minmax(260px, 1fr) 145px; gap: 22px; align-items: center; }
.accuracy-chart article > span { color: #e5f0ef; font-size: var(--text-xs); font-weight: 700; }
.accuracy-chart article > div { position: relative; height: 38px; overflow: visible; border: 1px solid rgba(255,255,255,.28); background: linear-gradient(90deg, rgba(255,255,255,.07) 1px, transparent 1px), rgba(7,27,34,.22); background-size: 10% 100%; }
.accuracy-chart article > div > i { position: absolute; inset: 0 auto 0 0; width: var(--accuracy); background: var(--gold); box-shadow: inset -2px 0 var(--ink); }
.accuracy-chart article:nth-child(2) > div > i { background: #d78a5b; }
.accuracy-chart article:nth-child(3) > div > i { background: #8ee2d8; }
.accuracy-chart article:nth-child(n+2) > div::after { content: ""; position: absolute; z-index: 2; top: 50%; width: 10%; height: 12px; transform: translateY(-50%); border: solid #fff; border-width: 0 2px; background: linear-gradient(#fff, #fff) center / 100% 2px no-repeat; }
.accuracy-chart article:nth-child(2) > div::after { left: 69.8%; }
.accuracy-chart article:nth-child(3) > div::after { left: 77%; }
.accuracy-chart article > strong { color: #fff; font: 700 var(--text-lg)/1.1 var(--sans); text-align: right; white-space: nowrap; }

.tree { font: var(--text-xs)/1.8 var(--mono); overflow-x: auto; padding: 26px; border: 1px solid var(--line); background: var(--ink); color: #d9e4e5; }
.tree .folder { color: var(--gold); }
.tree .file { color: #81d8d0; }
.filter-bar { display: flex; flex-wrap: wrap; gap: 9px; margin-bottom: 26px; }
.artifact-grid { display: grid; grid-template-columns: repeat(3, 1fr); gap: 16px; }
.artifact-card { min-height: 250px; padding: 28px; border: 1px solid var(--line); background: var(--white); }
.artifact-card[hidden] { display: none; }
.artifact-card .tier { display: inline-block; margin-bottom: 34px; padding: 4px 7px; border: 1px solid currentColor; color: var(--teal-dark); font: 700 var(--text-2xs) var(--sans); letter-spacing: .05em; text-transform: uppercase; }
.artifact-card[data-artifact-kind="design"] .tier { color: var(--purple); }
.artifact-card[data-artifact-kind="hardware"] .tier { color: var(--copper-dark); }
.artifact-card[data-artifact-kind="measurement"] .tier { color: var(--teal-dark); }
.artifact-card[data-artifact-kind="papers"] .tier { color: #6d5777; }
.artifact-card p { color: var(--muted); font-size: var(--text-sm); }

.paper-card { display: grid; grid-template-columns: 150px 1fr; gap: 30px; padding: clamp(28px, 4vw, 50px); border: 1px solid var(--line); background: var(--white); }
.paper-card + .paper-card { margin-top: 20px; }
.paper-badge { min-height: 150px; padding: 16px; display: flex; flex-direction: column; justify-content: space-between; background: var(--ink); color: #fff; }
.paper-badge strong { color: var(--gold); font: 700 var(--text-lg) var(--sans); }
.paper-badge span { font: var(--text-xs)/1.4 var(--sans); }
.paper-card h2 { margin: 0 0 18px; font-size: var(--text-2xl); }
.paper-meta { color: var(--muted); font-size: var(--text-xs); }
.citation-box { margin-top: 18px; padding: 16px; border: 1px solid var(--line); background: var(--paper); }
.citation-box code { display: block; overflow-wrap: anywhere; color: var(--muted); font-size: var(--text-xs); }
.copy-button { margin-top: 12px; padding: 7px 10px; border: 1px solid var(--ink); background: transparent; font: 700 var(--text-xs) var(--sans); cursor: pointer; }

.provenance { padding: 20px 24px; border: 1px solid var(--line); background: #fff; color: var(--muted); font-size: var(--text-xs); }
.provenance strong { color: var(--ink); }
.provenance a { color: var(--teal-dark); font-weight: 700; }

.journey-rail { position: sticky; z-index: 45; top: var(--header-height); min-height: 48px; padding: 0 max(20px, calc((100vw - var(--max)) / 2)); display: flex; align-items: center; gap: 24px; border-bottom: 1px solid var(--line); background: rgba(246,242,232,.96); backdrop-filter: blur(14px); }
.journey-rail > span { flex: 0 0 auto; color: var(--copper-dark); font: 700 var(--text-2xs) var(--sans); letter-spacing: .075em; text-transform: uppercase; }
.journey-rail > div { min-width: 0; display: flex; align-items: center; gap: 0; overflow-x: auto; scrollbar-width: none; }
.journey-rail > div::-webkit-scrollbar { display: none; }
.journey-rail a { position: relative; flex: 0 0 auto; padding: 14px 18px 13px; color: var(--muted); font-size: var(--text-xs); font-weight: 700; text-decoration: none; white-space: nowrap; }
.journey-rail a + a::before { content: "→"; position: absolute; left: -5px; color: var(--copper); opacity: .65; }
.journey-rail a:hover, .journey-rail a.current { color: var(--ink); }
.journey-rail a.is-active { box-shadow: inset 0 -3px var(--copper); }

.thesis-strip { display: grid; grid-template-columns: repeat(3, 1fr); border: 1px solid var(--line); background: var(--white); }
.thesis-strip article { min-height: 150px; padding: 26px 28px; border-right: 1px solid var(--line); }
.thesis-strip article:last-child { border-right: 0; }
.thesis-strip article > span { display: block; margin-bottom: 18px; color: var(--copper-dark); font: 700 var(--text-2xs) var(--sans); letter-spacing: .075em; text-transform: uppercase; }
.thesis-strip strong { display: block; font-size: var(--text-lg); line-height: 1.3; letter-spacing: -.02em; }
.page-hero + .thesis-strip { margin: 0; border-width: 0 0 1px; }
.page-hero + .thesis-strip article:first-child { padding-left: max(20px, calc((100vw - var(--max)) / 2)); }
.page-hero + .thesis-strip article:last-child { padding-right: max(20px, calc((100vw - var(--max)) / 2)); }

.concept-path { display: grid; grid-template-columns: repeat(5, 1fr); gap: 10px; align-items: stretch; }
.concept-node { position: relative; min-height: 180px; padding: 26px 22px; border: 1px solid var(--line); background: var(--white); }
.concept-node::after { content: "→"; position: absolute; z-index: 2; top: 50%; right: -17px; width: 24px; height: 24px; display: grid; place-items: center; transform: translateY(-50%); border: 1px solid var(--line); background: var(--paper); color: var(--copper-dark); font-weight: 700; }
.concept-node:last-child::after { display: none; }
.concept-node > span { color: var(--copper-dark); font: 700 var(--text-2xs) var(--sans); letter-spacing: .06em; text-transform: uppercase; }
.concept-node strong { display: block; margin: 32px 0 10px; font-size: var(--text-lg); line-height: 1.2; }
.concept-node p { margin: 0; color: var(--muted); font-size: var(--text-xs); line-height: 1.45; }
.concept-node .alpha, .equation-step .alpha { color: var(--purple); }
.concept-node .gamma, .equation-step .gamma { color: var(--copper-dark); }
.concept-node .theta, .equation-step .theta { color: var(--teal-dark); }

.equation-ladder { display: grid; grid-template-columns: repeat(3, minmax(0, 1fr)); gap: 12px; align-items: stretch; }
.equation-step { position: relative; min-height: 245px; padding: clamp(24px, 3vw, 34px); display: flex; flex-direction: column; border: 1px solid var(--line); background: var(--white); }
.equation-step::after { content: "→"; position: absolute; z-index: 3; top: 50%; right: -19px; width: 26px; height: 26px; display: grid; place-items: center; transform: translateY(-50%); border: 1px solid var(--line); background: var(--paper); color: var(--copper-dark); font-weight: 700; }
.equation-step:last-child::after { display: none; }
.equation-step > span:first-child { color: var(--copper-dark); font: 700 var(--text-2xs) var(--sans); letter-spacing: .07em; text-transform: uppercase; }
.equation-step > strong, .equation-step > .math-step { display: block; margin: 34px 0 18px; color: var(--ink); font-size: var(--text-lg); line-height: 1.35; overflow-x: auto; }
.math-step .katex { font-size: 1em; }
.math-step .katex-display { margin: 0; text-align: left; }
.equation-step > p { margin: auto 0 0; color: var(--muted); font-size: var(--text-xs); }
.equation-step .equation { margin: 28px 0 20px; padding: 16px 12px; font-size: var(--text-sm); }
.section-dark .equation-step, .section-teal .equation-step { border-color: rgba(255,255,255,.18); background: rgba(255,255,255,.055); }
.section-dark .equation-step::after, .section-teal .equation-step::after { border-color: rgba(255,255,255,.2); background: var(--ink); color: var(--gold); }
.section-dark .equation-step > span:first-child, .section-teal .equation-step > span:first-child { color: var(--gold); }
.section-dark .equation-step > strong, .section-dark .equation-step > .math-step, .section-teal .equation-step > strong, .section-teal .equation-step > .math-step { color: #fff; }
.section-dark .equation-step > p, .section-teal .equation-step > p { color: #bed0d1; }
.section-dark .equation-step.alpha-step > span:first-child, .section-teal .equation-step.alpha-step > span:first-child { color: #cbbbef; }
.section-dark .equation-step.corrected-step > span:first-child, .section-teal .equation-step.corrected-step > span:first-child { color: #74ddd1; }
.section-dark .equation-step.alpha-step > .math-step, .section-teal .equation-step.alpha-step > .math-step { color: #cbbbef; }
.section-dark .equation-step.corrected-step > .math-step, .section-teal .equation-step.corrected-step > .math-step { color: var(--gold); }
.section-dark .equation-step .alpha, .section-teal .equation-step .alpha { color: #cbbbef; }
.section-dark .equation-step .gamma, .section-teal .equation-step .gamma { color: var(--gold); }
.section-dark .equation-step .theta, .section-teal .equation-step .theta { color: #74ddd1; }

.takeaway { margin-top: 34px; padding: 24px 28px; display: grid; grid-template-columns: 150px 1fr; gap: 26px; border: 1px solid var(--line); border-left: 6px solid var(--teal); background: var(--white); }
.takeaway > span { color: var(--teal-dark); font: 700 var(--text-2xs) var(--sans); letter-spacing: .07em; text-transform: uppercase; }
.takeaway strong { font-size: var(--text-lg); line-height: 1.45; }
.section-dark .takeaway, .section-teal .takeaway { border-color: rgba(255,255,255,.2); border-left-color: var(--gold); background: rgba(255,255,255,.07); }
.section-dark .takeaway > span, .section-teal .takeaway > span { color: var(--gold); }

.compensation-compare { display: grid; grid-template-columns: 1fr 1fr; gap: 18px; margin-top: 42px; }
.signal-lane { padding: 26px; border: 1px solid rgba(255,255,255,.18); background: rgba(255,255,255,.055); }
.signal-lane > span { color: var(--gold); font: 700 var(--text-2xs) var(--sans); letter-spacing: .07em; text-transform: uppercase; }
.signal-route { margin: 24px 0 18px; display: flex; align-items: center; gap: 8px; overflow-x: auto; }
.signal-route .signal-math { flex: 0 0 auto; min-width: 72px; padding: 10px 12px; border: 1px solid rgba(255,255,255,.26); color: #fff; font-size: var(--text-xs); text-align: center; }
.signal-route b { color: var(--gold); font-size: var(--text-base); }
.signal-lane p { margin: 0; color: #bed0d1; font-size: var(--text-xs); }
.signal-lane.sec-on { border-color: rgba(232,187,99,.65); background: rgba(232,187,99,.08); }

.evidence-note { padding: 22px 24px; display: grid; grid-template-columns: auto 1fr; gap: 18px; align-items: start; border: 1px solid var(--line); background: var(--white); }
.evidence-type { display: inline-block; padding: 6px 8px; background: var(--ink); color: var(--gold); font: 700 var(--text-2xs) var(--sans); letter-spacing: .06em; text-transform: uppercase; white-space: nowrap; }
.evidence-note p { margin: 0; color: var(--muted); font-size: var(--text-sm); }
.evidence-equation { margin-top: 18px; overflow-x: auto; color: var(--ink); font-size: var(--text-sm); }
.evidence-equation .katex-display { margin: 0; text-align: left; }

.state-equations { display: grid; grid-template-columns: 1fr 1fr; gap: 14px; margin-bottom: 24px; }
.state-equations > div { padding: 20px; overflow-x: auto; border: 1px solid rgba(255,255,255,.2); background: rgba(255,255,255,.055); color: #fff; font-size: var(--text-sm); }
.state-equations .katex-display { margin: 0; }

.state-method { display: grid; grid-template-columns: 1fr auto 1fr auto 1fr; gap: 18px; align-items: center; margin-bottom: 34px; }
.state-stage { min-height: 190px; padding: 26px; display: flex; flex-direction: column; justify-content: space-between; border: 1px solid rgba(255,255,255,.2); background: rgba(255,255,255,.055); }
.state-stage > span { color: var(--gold); font: 700 var(--text-2xs) var(--sans); letter-spacing: .06em; text-transform: uppercase; }
.state-stage strong { display: block; margin: 16px 0 8px; font-size: var(--text-xl); line-height: 1.2; }
.state-stage p { margin: 0; color: #bed0d1; font-size: var(--text-xs); }
.state-arrow { color: var(--gold); font-size: var(--text-xl); font-weight: 700; }
.pattern-row { display: flex; gap: 4px; margin-top: 18px; }
.pattern-row i { width: 13px; height: 28px; background: var(--teal); }
.pattern-row i:nth-child(2n) { height: 17px; margin-top: 11px; background: var(--copper); }
.repeat-dots { display: grid; grid-template-columns: repeat(5, 9px); gap: 5px; margin-top: 18px; }
.repeat-dots i { width: 9px; height: 9px; border-radius: 50%; background: var(--gold); }

.fingerprint-grid { display: grid; grid-template-columns: repeat(4, 1fr); gap: 1px; border: 1px solid var(--line); background: var(--line); }
.fingerprint-grid article { padding: 24px; background: var(--white); }
.fingerprint-grid article > span { color: var(--copper-dark); font: 700 var(--text-2xs) var(--sans); letter-spacing: .06em; text-transform: uppercase; }
.fingerprint-grid strong { display: block; margin-top: 12px; font-size: var(--text-lg); }

.path-grid { display: grid; grid-template-columns: repeat(4, 1fr); gap: 16px; }
.path-card { min-height: 250px; padding: 28px; border: 1px solid var(--line); background: var(--white); }
.path-card > span { color: var(--copper-dark); font: 700 var(--text-2xs) var(--sans); letter-spacing: .06em; text-transform: uppercase; }
.path-card h3 { margin: 52px 0 14px; }
.path-card p { color: var(--muted); font-size: var(--text-sm); }
.path-card a { color: var(--teal-dark); font-weight: 700; }

.publication-path { display: grid; grid-template-columns: repeat(3, minmax(0, 1fr)); gap: 1px; border: 1px solid var(--line); background: var(--line); }
.publication-step { min-height: 220px; padding: 28px; background: var(--white); }
.publication-step > span { color: var(--copper-dark); font: 700 var(--text-2xs) var(--sans); letter-spacing: .07em; text-transform: uppercase; }
.publication-step strong { display: block; margin: 42px 0 12px; font-size: var(--text-xl); line-height: 1.25; }
.publication-step p { margin: 0; color: var(--muted); font-size: var(--text-xs); }

.page-handoff { display: grid; grid-template-columns: repeat(2, minmax(0, 1fr)); border-top: 1px solid var(--line); background: var(--paper-2); }
.handoff-link { min-height: 154px; padding: 32px clamp(28px, 4vw, 64px); display: flex; flex-direction: column; justify-content: center; text-decoration: none; transition: background .2s ease, color .2s ease; }
.handoff-previous { padding-left: max(20px, calc((100vw - var(--max)) / 2)); }
.handoff-next { padding-right: max(20px, calc((100vw - var(--max)) / 2)); border-left: 1px solid var(--line); background: var(--ink); color: #fff; text-align: right; }
.handoff-link span { margin-bottom: 10px; color: var(--copper-dark); font: 700 var(--text-2xs) var(--sans); letter-spacing: .07em; text-transform: uppercase; }
.handoff-next span { color: var(--gold); }
.handoff-link strong { max-width: 570px; font-size: var(--text-lg); line-height: 1.35; }
.handoff-next strong { margin-left: auto; }
.handoff-previous:hover { background: var(--white); }
.handoff-next:hover { background: var(--ink-2); color: var(--gold); }
.page-handoff > .handoff-link:only-child { grid-column: 1 / -1; }
.page-handoff > .handoff-next:only-child { padding-left: max(20px, calc((100vw - var(--max)) / 2)); border-left: 0; }
.page-handoff > .handoff-previous:only-child { padding-right: max(20px, calc((100vw - var(--max)) / 2)); }

.site-footer { padding: 64px max(20px, calc((100vw - var(--max)) / 2)); display: grid; grid-template-columns: 1fr auto; gap: 30px 80px; background: #041217; color: #b8c7c9; }
.footer-brand { color: #fff; font-size: var(--text-lg); font-weight: 700; text-decoration: none; }
.site-footer p { max-width: 560px; margin: 8px 0 0; font-size: var(--text-xs); }
.footer-links { display: flex; flex-direction: column; gap: 8px; align-items: flex-end; }
.footer-links a { color: #e3e9e9; font-size: var(--text-xs); font-weight: 700; }
.footer-note { grid-column: 1 / -1; padding-top: 24px; border-top: 1px solid rgba(255,255,255,.12); }

@media (max-width: 1120px) {
  .repo-link { display: none; }
  .site-nav a { padding-right: 9px; padding-left: 9px; font-size: var(--text-xs); }
  .hero-grid { grid-template-columns: 1fr; }
  .hero-visual { max-width: none; }
  .research-chain, .research-chain.chain-stages { grid-template-columns: repeat(2, 1fr); }
  .research-chain article { border-bottom: 1px solid var(--line); }
  .research-chain article::after { display: none; }
  .research-chain article:last-child { grid-column: 1 / -1; }
  .research-chain.chain-stages article:last-child { grid-column: auto; }
  .metric-rail { grid-template-columns: repeat(3, 1fr); }
  .metric-rail article { border-bottom: 1px solid rgba(255,255,255,.13); }
  .four-col, .result-grid { grid-template-columns: repeat(2, 1fr); }
  .concept-path { grid-template-columns: repeat(3, 1fr); }
  .concept-node::after { display: none; }
  .path-grid { grid-template-columns: repeat(2, 1fr); }
}

@media (max-width: 980px) {
  .three-col, .artifact-grid { grid-template-columns: repeat(2, minmax(0, 1fr)); }
}

@media (max-width: 820px) {
  body { font-size: var(--text-base); }
  .site-header { min-height: 68px; }
  .brand-icon { width: 44px; height: 44px; flex-basis: 44px; }
  .journey-rail { top: 68px; padding: 0 16px; gap: 8px; }
  .journey-rail > span { display: none; }
  .menu-toggle { display: block; }
  .site-nav { position: fixed; inset: 68px 0 auto; min-height: 0; padding: 16px 20px 22px; display: none; flex-direction: column; align-items: stretch; background: var(--white); border-top: 1px solid var(--line); box-shadow: 0 30px 50px rgba(7,27,34,.2); }
  .site-nav.open { display: flex; }
  .site-nav a { min-height: 46px; padding: 12px; border-bottom: 1px solid var(--line); }
  .site-nav a[aria-current="page"] { background: var(--paper); box-shadow: inset 3px 0 var(--purple); }
  .site-nav a.resource-start { margin: 8px 0 0; padding: 18px 12px 12px; border-top: 1px solid var(--line); border-left: 0; }
  .hero-grid { width: min(var(--max), calc(100% - 32px)); min-height: auto; padding: 60px 0; }
  .hero h1, .page-hero h1 { font-size: var(--text-hero); }
  .metric-rail { grid-template-columns: repeat(2, 1fr); }
  .two-col, .three-col, .artifact-grid { grid-template-columns: 1fr; }
  .research-chain, .research-chain.chain-stages { grid-template-columns: 1fr; }
  .research-chain article:last-child { grid-column: auto; }
  .phase { grid-template-columns: 50px 1fr; gap: 20px; }
  .phase p { grid-column: 2; }
  .stack { grid-template-columns: 1fr; }
  .stack article::after { content: "↓"; top: auto; right: 50%; bottom: -23px; transform: translateX(50%); }
  .stack-return { align-items: flex-start; flex-direction: column; gap: 6px; text-align: left; }
  .calculator-grid { grid-template-columns: repeat(2, 1fr); }
  .result-story-grid { grid-template-columns: 1fr; }
  .result-panel { min-height: 290px; }
  .accuracy-chart article { grid-template-columns: 138px minmax(150px, 1fr); gap: 10px 16px; }
  .accuracy-chart article > strong { grid-column: 2; grid-row: 2; text-align: left; }
  .paper-card { grid-template-columns: 1fr; }
  .paper-badge { min-height: 110px; }
  .thesis-strip { grid-template-columns: 1fr; }
  .thesis-strip article { min-height: 0; border-right: 0; border-bottom: 1px solid var(--line); }
  .thesis-strip article:last-child { border-bottom: 0; }
  .page-hero + .thesis-strip article { padding-right: 20px; padding-left: 20px; }
  .concept-path, .compensation-compare { grid-template-columns: 1fr; }
  .equation-ladder { grid-template-columns: 1fr; }
  .equation-step { min-height: 210px; }
  .equation-step::after { content: "↓"; top: auto; right: 50%; bottom: -20px; transform: translateX(50%); }
  .state-method { grid-template-columns: 1fr; }
  .state-equations { grid-template-columns: 1fr; }
  .state-arrow { transform: rotate(90deg); text-align: center; }
  .fingerprint-grid { grid-template-columns: repeat(2, 1fr); }
  .takeaway { grid-template-columns: 1fr; gap: 10px; }
  .spec-table, .spec-table tbody, .spec-table tr, .spec-table th, .spec-table td { display: block; width: 100%; }
  .spec-table tr { padding: 12px 0; border-bottom: 1px solid var(--line); }
  .spec-table th, .spec-table td { padding: 6px 16px; border: 0; }
  .publication-path { grid-template-columns: 1fr; }
  .page-handoff { grid-template-columns: 1fr; }
  .handoff-link { min-height: 132px; padding: 28px 20px; }
  .handoff-next { border-top: 1px solid var(--line); border-left: 0; text-align: left; }
  .handoff-next strong { margin-left: 0; }
}

@media (max-width: 520px) {
  .brand small { display: none; }
  .hero-project-mark { top: -26px; right: 16px; padding: 5px; }
  .hero-project-mark img { width: 52px; height: 52px; flex-basis: 52px; }
  .hero-project-mark span { display: none; }
  .metric-rail, .four-col, .result-grid, .calculator-output { grid-template-columns: 1fr; }
  .calculator-grid { grid-template-columns: 1fr; }
  .calculator-expression { text-align: left; overflow-wrap: anywhere; }
  .pair-value { grid-template-columns: 1fr auto 1fr; gap: 8px; }
  .pair-value strong { font-size: var(--text-2xl); }
  .accuracy-chart article { grid-template-columns: 1fr; gap: 8px; }
  .accuracy-chart article > strong { grid-column: 1; grid-row: auto; }
  .visual-caption { flex-direction: column; }
  .site-footer { grid-template-columns: 1fr; }
  .footer-links { align-items: flex-start; }
  .path-grid, .fingerprint-grid { grid-template-columns: 1fr; }
}

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