:root {
  --ink: #25284a;
  --ink-soft: #5d627f;
  --paper: #f5f2ed;
  --paper-deep: #e5e0d7;
  --line: #b9b6c0;
  --yellow: #f2c35f;
  --orange: #e77b8c;
  --teal: #87c6c8;
  --blue: #5268a3;
  --white: #fffdf7;
  --shadow: 0 18px 45px rgba(18, 59, 58, .15);
}
* { box-sizing: border-box; }
html { scroll-behavior: smooth; }
body { margin: 0; overflow-x: hidden; background: var(--paper); color: var(--ink); font-family: Arial, Helvetica, sans-serif; font-size: 16px; line-height: 1.55; }
a { color: inherit; text-decoration-thickness: .12em; text-underline-offset: .18em; }
a:hover { color: var(--orange); }
h1, h2, h3, p { max-width: 70ch; }
h1, h2, h3 { margin-top: 0; line-height: 1.02; }
h2 { font-size: clamp(2.3rem, 5.4vw, 5.3rem); letter-spacing: -.055em; }
h3 { font-size: clamp(1.2rem, 2.3vw, 1.8rem); letter-spacing: -.025em; }
p { margin: 0 0 1rem; }
em { font-style: italic; }
code, .eyebrow, .brand-copy, .figure-kicker, .section-kicker, .gauge-label, .source-stamp, .fact-card-head, .source-card-head, .unit-card span, .definition-card span, .formula-card span, .date-stop span, .claim-step span, .limit-card span { font-family: "Courier New", Courier, monospace; }
code { overflow-wrap: anywhere; }
.skip-link { position: fixed; z-index: 10; top: .75rem; left: .75rem; padding: .7rem 1rem; color: var(--ink); background: var(--yellow); transform: translateY(-160%); }
.skip-link:focus { transform: translateY(0); }
:focus-visible { outline: 3px solid var(--orange); outline-offset: 4px; }
.topbar { display: flex; align-items: center; justify-content: space-between; gap: 1rem; max-width: 1440px; margin: 0 auto; padding: 1rem clamp(1rem, 3vw, 3.5rem); border-bottom: 1px solid var(--line); }
.project-mark, .top-nav, .language-nav { display: flex; align-items: center; }
.project-mark { gap: .75rem; min-height: 2.75rem; text-decoration: none; }
.mark-box { display: grid; width: 3.2rem; height: 2.65rem; place-items: center; color: var(--ink); background: var(--yellow); border: 2px solid var(--ink); font-size: .8rem; font-weight: 800; letter-spacing: -.08em; }
.brand-copy { color: var(--ink-soft); font-size: .72rem; letter-spacing: .12em; text-transform: uppercase; }
.top-nav { gap: 1.25rem; font-weight: 700; }
.top-nav > a, .language-nav a, .language-nav span { display: inline-flex; min-height: 2.75rem; align-items: center; }
.top-nav > a { text-decoration: none; }
.language-nav { gap: .55rem; font-family: "Courier New", monospace; font-size: .78rem; }
.language-nav span { color: var(--orange); }
.language-nav a { text-decoration: none; }
.hero { display: grid; grid-template-columns: minmax(0, 1fr) minmax(0, 1fr); max-width: 1440px; margin: 0 auto; background: var(--ink); }
.hero-copy { min-width: 0; padding: clamp(2rem, 5vw, 5rem) clamp(1rem, 4vw, 4.5rem) 3.25rem; color: var(--white); }
.eyebrow { margin: 0 0 1.35rem; color: var(--yellow); font-size: .72rem; font-weight: 700; letter-spacing: .11em; }
.hero h1 { max-width: 13ch; margin-bottom: 1.2rem; color: var(--white); font-family: Georgia, "Times New Roman", serif; font-size: clamp(3.1rem, 7vw, 7.1rem); letter-spacing: -.075em; }
.deck { max-width: 58ch; color: #e5edeb; font-size: clamp(1.05rem, 1.6vw, 1.34rem); }
.reader-gain { max-width: 55ch; padding-left: 1rem; border-left: 5px solid var(--yellow); color: #fff7d9; }
.reader-gain strong { color: var(--yellow); }
.continuation-cue { color: #add0cb; font-size: .95rem; }
.source-stamp { display: flex; flex-wrap: wrap; gap: .45rem .7rem; margin: 1.4rem 0 .9rem; color: var(--ink); font-size: .67rem; font-weight: 700; letter-spacing: .05em; }
.source-stamp span { display: inline-flex; min-height: 2.75rem; align-items: center; padding: .45rem .6rem; background: var(--teal); border: 2px solid var(--ink); }
.source-stamp span:nth-child(2) { background: var(--yellow); }
.source-stamp span:nth-child(3) { background: var(--orange); }
.credibility { color: #d3e2de; font-size: .86rem; }
.credibility a { color: var(--yellow); }
.hero-visual { min-width: 0; margin: 0; padding: clamp(1rem, 3vw, 3rem); color: var(--ink); background: var(--paper-deep); border-left: 3px solid var(--orange); }
.hero-visual figcaption { display: grid; gap: .35rem; margin-bottom: 1.2rem; }
.figure-kicker { color: var(--orange); font-size: .68rem; font-weight: 700; letter-spacing: .1em; }
.hero-visual figcaption strong { font-family: Georgia, "Times New Roman", serif; font-size: clamp(2.1rem, 5vw, 4.6rem); letter-spacing: -.07em; line-height: .88; }
.hero-visual figcaption > span:last-child { color: var(--ink-soft); font-size: .82rem; }
.gauge-board { display: grid; grid-template-columns: 1fr 1fr; gap: .8rem; align-items: stretch; min-height: 330px; padding: 1rem; background-color: #d8e3da; background-image: linear-gradient(var(--line) 1px, transparent 1px), linear-gradient(90deg, var(--line) 1px, transparent 1px); background-size: 28px 28px; border: 3px solid var(--ink); }
.gauge-card { display: flex; min-width: 0; flex-direction: column; justify-content: space-between; padding: 1rem; border: 3px solid var(--ink); box-shadow: 8px 8px 0 rgba(18, 59, 58, .2); }
.gauge-sparse { background: var(--yellow); }
.gauge-fast { background: var(--orange); }
.gauge-label { font-size: .68rem; font-weight: 700; letter-spacing: .1em; }
.gauge-number { display: block; margin: 1rem 0 .8rem; font-family: Georgia, "Times New Roman", serif; font-size: clamp(3.2rem, 7vw, 6.2rem); letter-spacing: -.1em; line-height: .8; }
.gauge-card > span:not(.gauge-label) { font-size: .88rem; line-height: 1.3; }
.gauge-line { height: 1.3rem; margin-top: 1rem; background: var(--white); border: 2px solid var(--ink); }
.gauge-line i { display: block; height: 100%; background: var(--blue); }
.gauge-line i.fill-twenty { width: 20%; }
.gauge-line i.fill-fifty-five { width: 55%; background: var(--ink); }
.gauge-card small { margin-top: .55rem; font-family: "Courier New", monospace; font-size: .68rem; font-weight: 700; }
.visual-note { margin-top: 1rem; padding: .85rem 1rem; background: var(--white); border: 2px solid var(--ink); font-size: .87rem; }
.section-nav { display: flex; flex-wrap: wrap; gap: .45rem .9rem; max-width: 1440px; margin: 0 auto; padding: .9rem clamp(1rem, 4vw, 4.5rem); background: var(--yellow); border-bottom: 2px solid var(--ink); font-family: "Courier New", monospace; font-size: .72rem; font-weight: 700; letter-spacing: .05em; text-transform: uppercase; }
.section-nav a { display: inline-flex; min-height: 2.75rem; align-items: center; text-decoration: none; }
.section-nav a::before { content: "↳ "; }
.chapter { border-top: 1px solid var(--line); }
.chapter-inner { max-width: 1440px; margin: 0 auto; padding: clamp(3.5rem, 8vw, 8rem) clamp(1rem, 6vw, 6.5rem); }
.chapter-inner.narrow { max-width: 1060px; }
.chapter-light { background: var(--paper); }
.chapter-paper { background: var(--paper-deep); }
.chapter-ink { color: var(--white); background: var(--ink); }
.chapter-yellow { background: var(--yellow); }
.chapter-coral { color: var(--ink); background: var(--orange); }
.chapter-ink .section-kicker { color: var(--teal); }
.section-kicker { margin-bottom: 1rem; color: var(--orange); font-size: .72rem; font-weight: 700; letter-spacing: .1em; text-transform: uppercase; }
.chapter-ink h2 { color: var(--white); }
.chapter-ink a { color: var(--yellow); }
.chapter-coral h2 { color: var(--ink); }
.lead { max-width: 48ch; font-size: clamp(1.15rem, 2vw, 1.55rem); }
.chapter-grid { display: grid; grid-template-columns: minmax(0, .8fr) minmax(0, 1.2fr); gap: clamp(2rem, 7vw, 7rem); align-items: start; }
.chapter-grid > * { min-width: 0; }
.next-question { max-width: 48ch; margin-top: 2.4rem; padding-top: 1rem; border-top: 2px solid currentColor; font-family: "Courier New", monospace; font-size: .84rem; font-weight: 700; }
.metric-grid { display: grid; grid-template-columns: repeat(3, minmax(0, 1fr)); gap: .8rem; }
.metric-card { min-width: 0; min-height: 210px; padding: 1rem; color: var(--ink); background: var(--teal); border: 3px solid var(--ink); box-shadow: var(--shadow); }
.metric-card-accent { background: var(--orange); }
.metric-card-dark { color: var(--white); background: var(--blue); }
.metric-card span { display: block; font-family: "Courier New", monospace; font-size: .68rem; font-weight: 700; letter-spacing: .06em; }
.metric-card strong { display: block; margin: 2.3rem 0 .8rem; font-family: Georgia, "Times New Roman", serif; font-size: clamp(2.5rem, 5vw, 4.5rem); letter-spacing: -.1em; line-height: .8; }
.metric-card p { margin: 0; font-size: .82rem; line-height: 1.35; }
.unit-board, .definition-grid, .limits-grid { display: grid; grid-template-columns: repeat(3, minmax(0, 1fr)); gap: .8rem; margin: 2rem 0; }
.unit-card, .definition-card { min-width: 0; min-height: 210px; padding: 1rem; background: var(--yellow); border: 3px solid var(--ink); }
.unit-card-teal, .definition-card-dark { background: var(--teal); }
.unit-card-orange { background: var(--orange); }
.unit-card span, .definition-card span { display: block; font-size: .68rem; font-weight: 700; letter-spacing: .07em; }
.unit-card strong, .definition-card strong { display: block; margin: 2.3rem 0 .65rem; font-family: Georgia, "Times New Roman", serif; font-size: clamp(2rem, 4vw, 3.8rem); letter-spacing: -.08em; line-height: .88; }
.unit-card p, .definition-card p { margin: 0; font-size: .9rem; line-height: 1.35; }
.fact-card { padding: 1rem; background: var(--white); border: 3px solid var(--ink); box-shadow: var(--shadow); }
.fact-card-head, .source-card-head { display: flex; justify-content: space-between; gap: .8rem; color: var(--ink-soft); font-size: .66rem; font-weight: 700; letter-spacing: .07em; }
table { width: 100%; border-collapse: collapse; background: var(--white); font-size: .9rem; }
caption { margin-bottom: .6rem; text-align: left; font-family: Georgia, "Times New Roman", serif; font-size: 1.3rem; font-weight: 700; }
th, td { padding: .65rem .5rem; border-bottom: 1px solid var(--line); text-align: left; vertical-align: top; }
thead th { color: var(--ink-soft); font-family: "Courier New", monospace; font-size: .65rem; letter-spacing: .05em; text-transform: uppercase; }
tbody th { font-weight: 700; }
.date-rail { display: grid; grid-template-columns: 1fr auto 1fr; gap: 1rem; align-items: center; margin: 2rem 0; }
.date-stop { min-height: 190px; padding: 1rem; color: var(--ink); background: var(--yellow); border: 3px solid var(--ink); }
.date-stop-light { background: var(--teal); }
.date-stop span { display: block; font-size: .68rem; font-weight: 700; letter-spacing: .07em; }
.date-stop strong { display: block; margin: 2.5rem 0 .7rem; font-family: Georgia, "Times New Roman", serif; font-size: clamp(1.6rem, 3vw, 2.8rem); letter-spacing: -.06em; line-height: .9; }
.date-stop p { margin: 0; font-size: .85rem; }
.date-arrow { color: var(--teal); font-size: 2.8rem; font-weight: 800; }
.boundary-strip { padding: 1rem 1.2rem; color: var(--ink); background: var(--white); border-left: 6px solid var(--orange); }
.formula-card { display: grid; grid-template-columns: 1fr auto; gap: .35rem 1rem; align-items: end; margin: 2rem 0; padding: 1.2rem; color: var(--white); background: var(--ink); border: 3px solid var(--ink); box-shadow: var(--shadow); }
.formula-card span { grid-column: 1 / -1; color: var(--teal); font-size: .68rem; font-weight: 700; letter-spacing: .08em; }
.formula-card strong { font-family: "Courier New", monospace; font-size: clamp(1rem, 2.2vw, 1.5rem); overflow-wrap: anywhere; }
.formula-card b { color: var(--yellow); font-family: Georgia, "Times New Roman", serif; font-size: clamp(2rem, 4vw, 3.5rem); }
.formula-card p { grid-column: 1 / -1; margin: .4rem 0 0; color: #deebe8; font-size: .82rem; }
.limits-grid { grid-template-columns: repeat(4, minmax(0, 1fr)); }
.limit-card { min-width: 0; min-height: 240px; padding: 1rem; background: var(--white); border: 3px solid var(--ink); }
.limit-card-orange { background: var(--orange); }
.limit-card-teal { background: var(--teal); }
.limit-card span { display: block; color: var(--orange); font-size: .7rem; font-weight: 700; }
.limit-card h3 { margin: 2.5rem 0 .7rem; font-family: Georgia, "Times New Roman", serif; }
.limit-card p { font-size: .9rem; }
.warning-box { margin-top: 1rem; padding: 1rem 1.2rem; background: var(--paper-deep); border: 3px solid var(--ink); }
.claim-ladder { display: grid; grid-template-columns: minmax(0, 1fr) auto minmax(0, 1fr); gap: 1rem; align-items: center; margin: 2.2rem 0; }
.claim-step { min-height: 180px; padding: 1rem; border: 3px solid var(--ink); }
.claim-step span { display: block; margin-bottom: 2rem; font-size: .7rem; font-weight: 700; }
.claim-step strong { display: block; font-family: Georgia, "Times New Roman", serif; font-size: clamp(1.35rem, 3vw, 2.4rem); line-height: .96; }
.claim-step small { display: block; margin-top: .8rem; font-size: .78rem; }
.claim-supported { background: var(--yellow); }
.claim-not-supported { background: var(--paper); }
.claim-connector { font-size: 2rem; font-weight: 800; }
.source-card { padding: 1rem; color: var(--ink); background: var(--paper); border: 3px solid var(--yellow); }
.source-card-head { margin-bottom: 1rem; color: var(--orange); }
.source-card p { font-size: .9rem; }
.source-card a { color: var(--blue); }
.source-note { color: var(--ink-soft); font-size: .78rem !important; }
.recheck-box { margin-top: 1rem; padding: 1rem; color: var(--ink); background: var(--teal); border: 3px solid var(--ink); }
.recheck-box strong { display: block; margin-bottom: .4rem; font-family: Georgia, "Times New Roman", serif; font-size: 1.45rem; }
.recheck-box p { margin: 0; font-size: .9rem; }
.closing-line { margin: 2.5rem 0 0; color: var(--yellow); font-family: Georgia, "Times New Roman", serif; font-size: clamp(1.6rem, 4vw, 3rem); letter-spacing: -.04em; }
.site-footer { display: flex; justify-content: space-between; gap: 2rem; max-width: 1440px; margin: 0 auto; padding: 2rem clamp(1rem, 4vw, 4.5rem); background: var(--paper-deep); border-top: 3px solid var(--ink); }
.site-footer div { display: grid; gap: .35rem; }
.site-footer strong { font-family: Georgia, "Times New Roman", serif; font-size: 1.35rem; }
.site-footer span { color: var(--ink-soft); font-size: .83rem; }
.site-footer nav { display: flex; flex-wrap: wrap; gap: 1rem; align-items: flex-start; font-size: .82rem; font-weight: 700; }
.site-footer nav a { display: inline-flex; min-height: 2.75rem; align-items: center; }
.missing { max-width: 760px; margin: 0 auto; padding: 12vh 1rem; }
.missing h1 { font-family: Georgia, "Times New Roman", serif; font-size: clamp(3rem, 8vw, 7rem); letter-spacing: -.08em; }
@media (max-width: 980px) {
  .hero { grid-template-columns: 1fr; }
  .hero-visual { border-top: 3px solid var(--orange); border-left: 0; }
  .chapter-grid { grid-template-columns: 1fr; gap: 2rem; }
  .metric-grid { grid-template-columns: repeat(3, minmax(0, 1fr)); }
  .limits-grid { grid-template-columns: repeat(2, minmax(0, 1fr)); }
}
@media (max-width: 620px) {
  h2 { font-size: clamp(2.2rem, 12vw, 4rem); }
  .topbar { align-items: flex-start; }
  .top-nav { align-items: flex-end; flex-direction: column; gap: .35rem; }
  .brand-copy { max-width: 12ch; font-size: .62rem; }
  .hero-copy { padding-top: 1.7rem; padding-bottom: 2.3rem; }
  .hero h1 { font-size: clamp(3rem, 16vw, 5.4rem); }
  .hero-visual { padding: 1rem; }
  .gauge-board { grid-template-columns: 1fr; min-height: auto; }
  .gauge-card { min-height: 220px; }
  .section-nav { gap: .45rem .7rem; font-size: .65rem; }
  .chapter-inner { padding: 3.5rem 1rem; }
  .metric-grid, .unit-board, .definition-grid, .limits-grid { grid-template-columns: 1fr; }
  .metric-card, .unit-card, .definition-card, .limit-card { min-height: auto; }
  .metric-card strong, .unit-card strong, .definition-card strong { margin-top: 1.5rem; }
  .fact-card { padding: .7rem; overflow-x: auto; }
  th, td { padding: .55rem .35rem; font-size: .78rem; }
  .date-rail { grid-template-columns: 1fr; }
  .date-arrow { justify-self: center; transform: rotate(90deg); }
  .claim-ladder { grid-template-columns: 1fr; }
  .claim-connector { justify-self: center; transform: rotate(90deg); }
  .formula-card { grid-template-columns: 1fr; }
  .formula-card b { justify-self: end; }
  .site-footer { flex-direction: column; }
  .site-footer nav { gap: .7rem; }
}
@media (prefers-reduced-motion: reduce) {
  html { scroll-behavior: auto; }
  *, *::before, *::after { scroll-behavior: auto !important; transition-duration: .01ms !important; animation-duration: .01ms !important; animation-iteration-count: 1 !important; }
}