:root {
  --ink: #121827;
  --ink-soft: #4d5260;
  --paper: #f7f2e8;
  --paper-deep: #ece5d8;
  --white: #fffdf8;
  --cobalt: #3154f5;
  --cobalt-dark: #1935b8;
  --vermilion: #ff5d3b;
  --mint: #bce9d3;
  --rule: #d8d2c6;
  --rule-dark: #aaa398;
  --danger: #9b2f24;
  --serif: "Bodoni 72", "Bodoni MT", Didot, "Times New Roman", serif;
  --sans: "Avenir Next", Avenir, "Segoe UI", Helvetica, Arial, sans-serif;
  --mono: "SFMono-Regular", Consolas, "Liberation Mono", monospace;
  --max: 1380px;
  --reading: 760px;
  --shadow: 0 24px 70px rgba(18, 24, 39, 0.12);
}

* { box-sizing: border-box; }
html { scroll-behavior: smooth; scroll-padding-top: 7rem; }
body {
  margin: 0;
  color: var(--ink);
  background: var(--paper);
  font-family: var(--sans);
  font-size: 1rem;
  line-height: 1.7;
  text-rendering: optimizeLegibility;
  -webkit-font-smoothing: antialiased;
}
img, svg { display: block; max-width: 100%; }
a { color: inherit; text-underline-offset: 0.18em; text-decoration-thickness: 1px; }
a:hover { color: var(--cobalt-dark); }
button, input { font: inherit; }
button, a { -webkit-tap-highlight-color: transparent; }
:focus-visible { outline: 3px solid var(--vermilion); outline-offset: 4px; }
::selection { background: var(--mint); color: var(--ink); }

.sr-only {
  position: absolute;
  width: 1px;
  height: 1px;
  padding: 0;
  margin: -1px;
  overflow: hidden;
  clip: rect(0, 0, 0, 0);
  white-space: nowrap;
  border: 0;
}

.skip-link {
  position: fixed;
  z-index: 1000;
  top: 0.75rem;
  left: 0.75rem;
  transform: translateY(-160%);
  background: var(--ink);
  color: #fff;
  padding: 0.7rem 1rem;
  border-radius: 3px;
}
.skip-link:focus { transform: translateY(0); color: #fff; }

.reading-progress {
  position: fixed;
  z-index: 120;
  inset: 0 0 auto;
  height: 3px;
  pointer-events: none;
}
.reading-progress span {
  display: block;
  width: 100%;
  height: 100%;
  transform: scaleX(0);
  transform-origin: left;
  background: var(--vermilion);
}

.edition-bar {
  display: flex;
  justify-content: space-between;
  gap: 1rem;
  padding: 0.46rem max(1rem, calc((100vw - var(--max)) / 2));
  color: #fff;
  background: var(--ink);
  font: 700 0.66rem/1.2 var(--mono);
  letter-spacing: 0.11em;
  text-transform: uppercase;
}

.site-header {
  position: relative;
  z-index: 100;
  display: flex;
  align-items: center;
  justify-content: space-between;
  width: min(calc(100% - 2rem), var(--max));
  margin: 0 auto;
  padding: 1.2rem 0;
  border-bottom: 1px solid var(--rule);
}
.site-brand {
  display: inline-flex;
  align-items: center;
  gap: 0.7rem;
  color: var(--ink);
  text-decoration: none;
}
.site-brand:hover { color: var(--ink); }
.brand-mark { width: 42px; height: 42px; flex: none; }
.site-brand > span { display: flex; flex-direction: column; line-height: 0.9; }
.site-brand strong {
  font-family: var(--serif);
  font-size: 1.14rem;
  letter-spacing: -0.02em;
}
.site-brand em {
  margin-left: 1.55rem;
  color: var(--cobalt);
  font: 800 0.64rem/1 var(--mono);
  font-style: normal;
  letter-spacing: 0.18em;
  text-transform: uppercase;
}
.site-nav { display: flex; align-items: center; gap: clamp(1.4rem, 3vw, 3rem); }
.site-nav a {
  position: relative;
  color: var(--ink);
  font-size: 0.78rem;
  font-weight: 800;
  letter-spacing: 0.09em;
  text-decoration: none;
  text-transform: uppercase;
}
.site-nav a::after {
  content: "";
  position: absolute;
  right: 0;
  bottom: -0.45rem;
  left: 0;
  height: 2px;
  transform: scaleX(0);
  transform-origin: right;
  background: var(--vermilion);
  transition: transform 180ms ease;
}
.site-nav a:hover::after, .site-nav a[aria-current="page"]::after { transform: scaleX(1); transform-origin: left; }
.menu-button { display: none; }

.plate {
  display: inline-flex;
  align-items: center;
  gap: 0.45rem;
  color: var(--cobalt-dark);
  font: 800 0.66rem/1.2 var(--mono);
  letter-spacing: 0.13em;
  text-transform: uppercase;
}
.plate::before { content: ""; width: 1.3rem; height: 2px; background: currentColor; }
.plate-light { color: var(--mint); }

h1, h2, h3, p { margin-top: 0; }
h1, h2 {
  font-family: var(--serif);
  font-weight: 600;
  letter-spacing: -0.035em;
  line-height: 0.98;
  text-wrap: balance;
}
h3 { line-height: 1.15; text-wrap: balance; }

.button {
  display: inline-flex;
  align-items: center;
  justify-content: center;
  min-height: 3.15rem;
  padding: 0.65rem 1.15rem;
  border: 1px solid var(--ink);
  border-radius: 2px;
  font-size: 0.78rem;
  font-weight: 800;
  letter-spacing: 0.07em;
  text-decoration: none;
  text-transform: uppercase;
}
.button-primary { color: #fff; background: var(--ink); }
.button-primary:hover { color: #fff; background: var(--cobalt-dark); border-color: var(--cobalt-dark); }
.button-quiet { color: var(--ink); background: transparent; }
.button-quiet:hover { color: var(--ink); background: var(--mint); }
.hero-actions { display: flex; flex-wrap: wrap; gap: 0.7rem; }

/* Home */
.home-hero {
  display: grid;
  grid-template-columns: minmax(0, 0.9fr) minmax(450px, 1.1fr);
  width: min(calc(100% - 2rem), var(--max));
  min-height: 680px;
  margin: 0 auto;
  padding: clamp(3.5rem, 8vw, 7rem) 0 5rem;
}
.home-hero-copy {
  display: flex;
  flex-direction: column;
  align-items: flex-start;
  justify-content: center;
  padding-right: clamp(2rem, 6vw, 6.5rem);
}
.home-hero h1 {
  max-width: 710px;
  margin: 1.3rem 0 1.6rem;
  font-size: clamp(3.8rem, 7vw, 7.2rem);
}
.home-hero-copy > p {
  max-width: 610px;
  margin-bottom: 2rem;
  color: var(--ink-soft);
  font-size: clamp(1.06rem, 1.8vw, 1.28rem);
}
.hero-facts {
  display: flex;
  gap: clamp(1.2rem, 3.5vw, 3.6rem);
  margin: 3.5rem 0 0;
}
.hero-facts div { display: flex; align-items: baseline; gap: 0.55rem; }
.hero-facts dt { font: 600 clamp(1.8rem, 3vw, 2.6rem)/1 var(--serif); }
.hero-facts dd { margin: 0; color: var(--ink-soft); font: 700 0.65rem/1.2 var(--mono); letter-spacing: 0.08em; text-transform: uppercase; }
.home-hero-visual {
  position: relative;
  align-self: stretch;
  margin: 0;
  min-height: 560px;
  overflow: hidden;
  background: var(--paper-deep);
  box-shadow: var(--shadow);
}
.home-hero-visual::after {
  content: "";
  position: absolute;
  inset: 1rem;
  border: 1px solid rgba(255, 255, 255, 0.72);
  pointer-events: none;
}
.home-hero-visual img { width: 100%; height: 100%; object-fit: cover; }
.home-hero-visual figcaption {
  position: absolute;
  right: 1.7rem;
  bottom: 1.7rem;
  left: 1.7rem;
  display: flex;
  justify-content: space-between;
  gap: 1rem;
  padding: 0.8rem 1rem;
  color: #fff;
  background: rgba(18, 24, 39, 0.9);
  font-size: 0.78rem;
}
.home-hero-visual figcaption span { color: var(--mint); font: 800 0.64rem/1.2 var(--mono); letter-spacing: 0.12em; text-transform: uppercase; }
.fact-stamp {
  position: absolute;
  top: 2.1rem;
  right: 2rem;
  display: grid;
  place-items: center;
  width: 92px;
  height: 92px;
  transform: rotate(4deg);
  border: 2px solid var(--ink);
  border-radius: 50%;
  background: rgba(247, 242, 232, 0.87);
  text-align: center;
}
.fact-stamp strong { display: block; font: 700 1.1rem/1 var(--mono); }
.fact-stamp span { font: 800 0.58rem/1.3 var(--mono); letter-spacing: 0.09em; text-transform: uppercase; }

.decision-strip {
  display: grid;
  grid-template-columns: minmax(260px, 0.55fr) minmax(0, 1.45fr);
  gap: 4rem;
  align-items: end;
  padding: 4.3rem max(1rem, calc((100vw - var(--max)) / 2));
  background: var(--white);
  border-block: 1px solid var(--rule);
}
.decision-strip h2 { margin: 1rem 0 0; font-size: clamp(2.5rem, 4.5vw, 4.4rem); }
.decision-strip ol {
  display: grid;
  grid-template-columns: repeat(4, 1fr);
  margin: 0;
  padding: 0;
  list-style: none;
}
.decision-strip li { min-height: 128px; padding: 0 1.2rem; border-left: 1px solid var(--rule); }
.decision-strip li span { display: block; margin-bottom: 2.3rem; color: var(--vermilion); font: 800 0.62rem/1 var(--mono); }
.decision-strip li strong { display: block; font: 600 1.5rem/1.1 var(--serif); }
.decision-strip li small { color: var(--ink-soft); font: 700 0.65rem/1.2 var(--mono); letter-spacing: 0.07em; text-transform: uppercase; }

.guide-index {
  width: min(calc(100% - 2rem), var(--max));
  margin: 0 auto;
  padding: clamp(5rem, 9vw, 9rem) 0;
}
.section-heading {
  display: grid;
  grid-template-columns: minmax(0, 1fr) minmax(260px, 0.42fr);
  gap: 3rem;
  align-items: end;
  margin-bottom: 3.5rem;
}
.section-heading h2 { margin: 1rem 0 0; font-size: clamp(3rem, 6vw, 5.9rem); }
.section-heading > p { margin: 0; color: var(--ink-soft); font-size: 1.08rem; }
.guide-grid { display: grid; grid-template-columns: repeat(12, 1fr); gap: 1rem; }
.guide-card {
  position: relative;
  display: grid;
  grid-template-columns: 70px 1fr;
  gap: 1.2rem;
  min-height: 305px;
  padding: 1.5rem;
  overflow: hidden;
  border: 1px solid var(--rule-dark);
  background: var(--white);
  transition: transform 180ms ease, box-shadow 180ms ease;
}
.guide-card:hover { transform: translateY(-4px); box-shadow: 0 18px 48px rgba(18, 24, 39, 0.1); }
.guide-card-1 { grid-column: span 7; background: var(--cobalt); color: #fff; }
.guide-card-2 { grid-column: span 5; }
.guide-card-3 { grid-column: span 4; }
.guide-card-4 { grid-column: span 4; background: var(--mint); }
.guide-card-5 { grid-column: span 4; background: var(--vermilion); }
.guide-card-6 { grid-column: span 5; background: var(--ink); color: #fff; }
.guide-card-7 { grid-column: span 7; background: var(--mint); }
.guide-card-8 { grid-column: span 4; background: var(--vermilion); }
.guide-card-9 { grid-column: span 4; }
.guide-card-10 { grid-column: span 4; background: var(--cobalt); color: #fff; }
.guide-card-index { font: 600 2.3rem/1 var(--serif); opacity: 0.65; }
.guide-kind { font: 800 0.62rem/1.2 var(--mono); letter-spacing: 0.12em; text-transform: uppercase; }
.guide-card h3 { margin: 1.2rem 0 0.8rem; font: 600 clamp(2rem, 3.8vw, 3.7rem)/0.95 var(--serif); letter-spacing: -0.035em; }
.guide-card h3 a { text-decoration: none; }
.guide-card h3 a::after { content: ""; position: absolute; inset: 0; }
.guide-card p { max-width: 520px; color: currentColor; opacity: 0.76; }
.guide-card-1 p, .guide-card-6 p, .guide-card-10 p { opacity: 0.92; }
.guide-cue { position: absolute; right: 1.5rem; bottom: 1.35rem; font: 800 0.64rem/1.2 var(--mono); letter-spacing: 0.1em; text-transform: uppercase; }
.guide-card-1 a:hover, .guide-card-6 a:hover, .guide-card-10 a:hover { color: var(--mint); }

.issue-two {
  display: grid;
  grid-template-columns: minmax(0, 1.28fr) minmax(340px, 0.72fr);
  gap: clamp(2rem, 5vw, 5rem);
  align-items: center;
  padding: clamp(4rem, 8vw, 8rem) max(1rem, calc((100vw - var(--max)) / 2));
  color: #fff;
  background: var(--ink);
  border-block: 1px solid #444a59;
}
.issue-two-visual { margin: 0; border: 1px solid #5a6070; background: var(--paper); box-shadow: 16px 16px 0 var(--cobalt); }
.issue-two-visual img { display: block; width: 100%; height: auto; aspect-ratio: 16 / 9; object-fit: cover; }
.issue-two-visual figcaption { display: flex; justify-content: space-between; gap: 1rem; padding: 0.8rem 1rem; color: var(--ink); background: var(--paper); font-size: 0.72rem; }
.issue-two-visual figcaption span { color: var(--cobalt-dark); font: 800 0.62rem/1.2 var(--mono); letter-spacing: 0.1em; text-transform: uppercase; }
.issue-two-copy h2 { max-width: 650px; margin: 1rem 0 1.4rem; font-size: clamp(3rem, 5vw, 5.4rem); }
.issue-two-copy > p { max-width: 620px; color: #cbd0dc; }
.issue-two-copy ol { margin: 2.3rem 0 0; padding: 0; list-style: none; border-top: 1px solid #545b6b; }
.issue-two-copy li { margin: 0; border-bottom: 1px solid #545b6b; }
.issue-two-copy a { display: grid; grid-template-columns: 44px 1fr; gap: 0.8rem; align-items: center; padding: 0.9rem 0; color: #fff; text-decoration: none; }
.issue-two-copy a:hover { color: var(--mint); }
.issue-two-copy a span { color: var(--vermilion); font: 800 0.64rem/1 var(--mono); }

.economics-band {
  display: grid;
  grid-template-columns: minmax(300px, 0.7fr) minmax(0, 1.3fr);
  gap: 6rem;
  padding: clamp(5rem, 9vw, 8rem) max(1rem, calc((100vw - var(--max)) / 2));
  color: #fff;
  background: var(--ink);
}
.economics-copy h2 { margin: 1.2rem 0 1.5rem; font-size: clamp(3rem, 5.5vw, 5.5rem); }
.economics-copy p { max-width: 540px; color: #cbd0dc; }
.economics-graphic {
  display: grid;
  grid-template-columns: repeat(3, 1fr);
  gap: 1.5rem;
  min-height: 430px;
  align-items: end;
  padding-top: 2rem;
  border-bottom: 1px solid #606675;
}
.economics-graphic div { position: relative; display: flex; flex-direction: column; justify-content: flex-end; height: 100%; }
.economics-graphic span { margin-bottom: 0.7rem; font: 800 0.66rem/1.2 var(--mono); letter-spacing: 0.1em; text-transform: uppercase; }
.economics-graphic i { display: block; background: var(--cobalt); }
.economics-graphic .bar-free i { height: 18%; }
.economics-graphic .bar-fixed i { height: 50%; }
.economics-graphic .bar-share i { height: 86%; }
.economics-graphic div:nth-child(2) i { background: var(--mint); }
.economics-graphic div:nth-child(3) i { background: var(--vermilion); }
.economics-graphic strong { position: absolute; right: 0.8rem; bottom: 0.65rem; color: var(--ink); font: 800 0.75rem/1 var(--mono); }

.method-preview {
  display: grid;
  grid-template-columns: 0.75fr 1.25fr;
  gap: 6rem;
  width: min(calc(100% - 2rem), var(--max));
  margin: 0 auto;
  padding: clamp(5rem, 9vw, 9rem) 0;
}
.method-preview h2 { margin: 1rem 0 1.4rem; font-size: clamp(3rem, 5vw, 5rem); }
.method-preview p { color: var(--ink-soft); }
.text-link { font-weight: 800; text-decoration-color: var(--vermilion); }
.method-preview ol { display: grid; grid-template-columns: repeat(2, 1fr); margin: 0; padding: 0; list-style: none; border-top: 1px solid var(--rule-dark); }
.method-preview li { display: flex; gap: 1rem; align-items: center; min-height: 94px; border-bottom: 1px solid var(--rule-dark); font-family: var(--serif); font-size: 1.6rem; }
.method-preview li:nth-child(odd) { border-right: 1px solid var(--rule-dark); }
.method-preview li b { color: var(--cobalt); font: 800 0.65rem/1 var(--mono); }

/* Article */
.article-hero, .bench-answer, .article-shell, .related-guides {
  width: min(calc(100% - 2rem), var(--max));
  margin-inline: auto;
}
.breadcrumbs {
  display: flex;
  flex-wrap: wrap;
  gap: 0.55rem;
  align-items: center;
  color: var(--ink-soft);
  font: 700 0.7rem/1.3 var(--mono);
  letter-spacing: 0.05em;
}
.breadcrumbs a { color: var(--cobalt-dark); }
.article-hero { padding: 2rem 0 3.5rem; }
.article-hero-grid { display: grid; grid-template-columns: minmax(0, 1.08fr) minmax(420px, 0.92fr); gap: clamp(3rem, 7vw, 7rem); align-items: center; padding-top: 4rem; }
.article-hero h1 { max-width: 850px; margin: 1.2rem 0 1.7rem; font-size: clamp(3.7rem, 7vw, 7.3rem); }
.article-hero-copy > p { max-width: 760px; color: var(--ink-soft); font-size: clamp(1.08rem, 1.8vw, 1.3rem); }
.article-meta { display: flex; flex-wrap: wrap; gap: 0.75rem 2rem; margin-top: 2.4rem; font: 700 0.68rem/1.3 var(--mono); letter-spacing: 0.05em; text-transform: uppercase; }
.article-meta span { display: flex; gap: 0.35rem; }
.article-art { margin: 0; border: 1px solid var(--rule-dark); background: var(--white); box-shadow: var(--shadow); }
.article-art figcaption { display: flex; justify-content: space-between; gap: 1rem; padding: 0.75rem 1rem; border-top: 1px solid var(--rule); color: var(--ink-soft); font-size: 0.72rem; }
.article-art figcaption span { color: var(--cobalt-dark); font: 800 0.62rem/1.2 var(--mono); letter-spacing: 0.1em; text-transform: uppercase; }
.route-art { width: 100%; height: auto; }

.bench-answer {
  display: grid;
  grid-template-columns: minmax(180px, 0.35fr) minmax(0, 1.65fr);
  gap: 3rem;
  margin-bottom: 5rem;
  padding: 2.2rem;
  color: #fff;
  background: var(--cobalt);
  border-left: 8px solid var(--vermilion);
}
.bench-answer h2 { margin: 0.4rem 0 0; font-size: clamp(2rem, 3vw, 3.3rem); }
.bench-index { color: var(--mint); font: 800 0.67rem/1 var(--mono); letter-spacing: 0.13em; }
.bench-answer p:last-child { margin-bottom: 0; }

.article-shell { display: grid; grid-template-columns: 230px minmax(0, var(--reading)); gap: clamp(3rem, 7vw, 7rem); justify-content: center; align-items: start; }
.toc { position: sticky; top: 2rem; display: flex; flex-direction: column; padding-left: 1rem; border-left: 1px solid var(--rule-dark); }
.toc .plate { margin-bottom: 1rem; }
.toc a { padding: 0.45rem 0; color: var(--ink-soft); font-size: 0.76rem; line-height: 1.35; text-decoration: none; }
.toc a:hover, .toc a.is-active { color: var(--cobalt-dark); font-weight: 800; }
.article-body { min-width: 0; }
.prose { color: #262b37; }
.prose p, .prose li { font-size: 1.05rem; }
.prose p { margin-bottom: 1.25rem; }
.prose a { color: var(--cobalt-dark); }
.prose h2 { margin: 0 0 1.7rem; font-size: clamp(2.5rem, 4.6vw, 4.4rem); }
.prose h3 { margin: 2.1rem 0 0.7rem; font-family: var(--serif); font-size: 1.7rem; }
.prose ul, .prose ol { padding-left: 1.25rem; }
.prose li { margin-bottom: 0.65rem; padding-left: 0.35rem; }
.article-section { margin-bottom: 5.5rem; scroll-margin-top: 2rem; }
.article-section > h2::before { content: ""; display: block; width: 52px; height: 5px; margin-bottom: 1.35rem; background: var(--vermilion); }
.signal-note, .caution {
  margin: 2rem 0;
  padding: 1.25rem 1.4rem;
  border-left: 5px solid var(--cobalt);
  background: var(--mint);
}
.caution { border-color: var(--vermilion); background: #ffe5dc; }
.decision-grid { display: grid; grid-template-columns: repeat(2, 1fr); gap: 0.8rem; margin: 2rem 0; }
.decision-grid article { padding: 1.2rem; border: 1px solid var(--rule-dark); background: var(--white); }
.decision-grid article:last-child { grid-column: 1 / -1; }
.decision-label { color: var(--cobalt-dark); font: 800 0.62rem/1.2 var(--mono); letter-spacing: 0.1em; text-transform: uppercase; }
.decision-grid h3 { margin: 0.8rem 0 0.4rem; }
.decision-grid p { margin: 0; font-size: 0.92rem; }
.comparison-pair { display: grid; grid-template-columns: repeat(2, 1fr); gap: 1px; margin: 2rem 0; background: var(--ink); border: 1px solid var(--ink); }
.comparison-pair div { padding: 1.4rem; background: var(--white); }
.comparison-pair span { display: block; margin-bottom: 0.55rem; color: var(--cobalt-dark); font: 800 0.62rem/1.2 var(--mono); letter-spacing: 0.1em; text-transform: uppercase; }
.comparison-pair strong { font-family: var(--serif); font-size: 1.45rem; line-height: 1.15; }
.scenario-list { margin: 2rem 0; padding: 0 !important; list-style: none; border-top: 1px solid var(--rule-dark); }
.scenario-list li { margin: 0; padding: 1rem 0.2rem !important; border-bottom: 1px solid var(--rule); }

.table-wrap { width: 100%; margin: 2rem 0; overflow-x: auto; border: 1px solid var(--rule-dark); background: var(--white); }
table { width: 100%; min-width: 690px; border-collapse: collapse; font-size: 0.9rem; line-height: 1.45; }
caption { padding: 0.9rem 1rem; color: #fff; background: var(--ink); font: 800 0.66rem/1.2 var(--mono); letter-spacing: 0.1em; text-align: left; text-transform: uppercase; }
th, td { padding: 0.9rem 1rem; border-right: 1px solid var(--rule); border-bottom: 1px solid var(--rule); text-align: left; vertical-align: top; }
thead th { background: var(--paper-deep); font-size: 0.72rem; letter-spacing: 0.06em; text-transform: uppercase; }
tbody th { width: 22%; font-family: var(--serif); font-size: 1.05rem; }
tr:last-child th, tr:last-child td { border-bottom: 0; }
th:last-child, td:last-child { border-right: 0; }

/* Calculator */
.calculator, .checklist-tool { margin: 2.2rem 0; padding: 1.5rem; border: 1px solid var(--ink); background: var(--white); box-shadow: 10px 10px 0 var(--mint); }
.tool-heading { display: flex; align-items: end; justify-content: space-between; gap: 1rem; margin-bottom: 1.6rem; padding-bottom: 1rem; border-bottom: 1px solid var(--rule-dark); }
.tool-heading h3 { margin: 0.6rem 0 0; font-size: 2rem; }
.tool-heading > p, .tool-heading > strong { margin: 0; color: var(--ink-soft); font: 800 0.66rem/1.2 var(--mono); letter-spacing: 0.06em; text-transform: uppercase; }
.calculator-grid { display: grid; grid-template-columns: repeat(2, 1fr); gap: 1rem; }
.calculator label { display: flex; flex-direction: column; gap: 0.4rem; color: var(--ink); font-size: 0.78rem; font-weight: 800; }
.calculator input {
  min-width: 0;
  width: 100%;
  min-height: 2.9rem;
  padding: 0.5rem 0.7rem;
  color: var(--ink);
  background: var(--paper);
  border: 1px solid var(--rule-dark);
  border-radius: 0;
  font-family: var(--mono);
}
.calculator input[aria-invalid="true"] { border-color: var(--danger); background: #fff0ed; }
.input-affix { display: grid; grid-template-columns: auto 1fr auto; align-items: center; border: 1px solid var(--rule-dark); background: var(--paper); }
.input-affix input { border: 0; }
.input-affix > span { padding: 0 0.65rem; color: var(--ink-soft); font-family: var(--mono); }
.field-error { margin: 1rem 0 0; color: var(--danger); font-weight: 800; }
.result-grid { display: grid; grid-template-columns: repeat(2, 1fr); gap: 1px; margin-top: 1.5rem; background: var(--rule-dark); border: 1px solid var(--rule-dark); }
.result-grid div { padding: 1rem; background: var(--ink); color: #fff; }
.result-grid span { display: block; margin-bottom: 0.45rem; color: var(--mint); font: 800 0.61rem/1.2 var(--mono); letter-spacing: 0.07em; text-transform: uppercase; }
.result-grid strong { font: 600 1.8rem/1 var(--serif); }
.tool-note { margin: 1rem 0 0 !important; color: var(--ink-soft); font-size: 0.78rem !important; }

/* Checklist */
.progress-track { height: 8px; margin-bottom: 1.3rem; overflow: hidden; background: var(--paper-deep); }
.progress-track span { display: block; width: 0; height: 100%; background: var(--cobalt); transition: width 180ms ease; }
.checklist-items { display: grid; grid-template-columns: repeat(2, 1fr); gap: 0.65rem; }
.checklist-items label { display: flex; gap: 0.75rem; align-items: flex-start; min-height: 4.2rem; padding: 0.8rem; border: 1px solid var(--rule); font-size: 0.86rem; font-weight: 700; cursor: pointer; }
.checklist-items label:has(input:checked) { background: var(--mint); border-color: var(--ink); text-decoration: line-through; text-decoration-thickness: 1px; }
.checklist-items input { width: 1.15rem; height: 1.15rem; flex: none; margin-top: 0.2rem; accent-color: var(--cobalt); }
.text-button { margin-top: 1rem; padding: 0.5rem 0; color: var(--cobalt-dark); background: none; border: 0; font-weight: 800; text-decoration: underline; text-underline-offset: 0.2em; cursor: pointer; }

/* Source desk and FAQ */
.source-desk { color: #fff; background: var(--ink); }
.source-desk header { padding: 2rem; border-bottom: 1px solid #4a5060; }
.source-desk h2 { margin: 0.8rem 0 1rem; font-size: 3.6rem; }
.source-desk header p { max-width: 600px; margin: 0; color: #cbd0dc; font-size: 0.92rem; }
.source-desk ol { margin: 0; padding: 0; list-style: none; }
.source-desk li { display: grid; grid-template-columns: 46px 1fr; gap: 0.8rem; margin: 0; padding: 1.1rem 1.3rem; border-bottom: 1px solid #4a5060; }
.source-desk li > span { color: var(--mint); font: 800 0.68rem/1.4 var(--mono); }
.source-desk li a { color: #fff; font-weight: 800; }
.source-desk li a:hover { color: var(--mint); }
.source-desk li p { margin: 0.3rem 0; color: #cbd0dc; font-size: 0.83rem; }
.source-desk li small { color: #8f96a6; font: 700 0.62rem/1.2 var(--mono); }
.faq-section > .plate { margin-bottom: 1rem; }
.faq-list { border-top: 1px solid var(--rule-dark); }
.faq-list details { border-bottom: 1px solid var(--rule-dark); }
.faq-list summary { position: relative; padding: 1.3rem 3rem 1.3rem 0; font-family: var(--serif); font-size: 1.35rem; font-weight: 600; line-height: 1.25; cursor: pointer; list-style: none; }
.faq-list summary::-webkit-details-marker { display: none; }
.faq-list summary::after { content: "+"; position: absolute; top: 1.05rem; right: 0.35rem; color: var(--cobalt); font: 400 1.8rem/1 var(--sans); }
.faq-list details[open] summary::after { content: "−"; }
.faq-list details div { max-width: 650px; padding: 0 2rem 1.2rem 0; }

.related-guides { padding: 2rem 0 7rem; }
.related-guides header { display: flex; justify-content: space-between; align-items: end; gap: 2rem; padding-bottom: 1.2rem; border-bottom: 1px solid var(--rule-dark); }
.related-guides h2 { margin: 0.7rem 0 0; font-size: clamp(2.6rem, 5vw, 5rem); }
.related-guides > div { display: grid; grid-template-columns: repeat(3, 1fr); }
.related-guides > div > a { position: relative; display: flex; flex-direction: column; min-height: 180px; padding: 1.2rem; border-right: 1px solid var(--rule-dark); border-bottom: 1px solid var(--rule-dark); text-decoration: none; }
.related-guides > div > a:last-child { border-right: 0; }
.related-guides a span { color: var(--cobalt-dark); font: 800 0.61rem/1.2 var(--mono); letter-spacing: 0.09em; text-transform: uppercase; }
.related-guides a strong { max-width: 280px; margin-top: 1rem; font: 600 1.7rem/1.1 var(--serif); }
.related-guides a i { position: absolute; right: 1.2rem; bottom: 1rem; color: var(--vermilion); font-style: normal; }
.related-guides a:hover { color: var(--ink); background: var(--mint); }

/* Legal and 404 */
.legal-main { width: min(calc(100% - 2rem), 980px); margin: 0 auto; padding: 2rem 0 7rem; }
.legal-hero { padding: 5rem 0 3rem; border-bottom: 1px solid var(--rule-dark); }
.legal-hero h1 { margin: 1rem 0 0; font-size: clamp(4rem, 9vw, 8rem); }
.legal-body { max-width: var(--reading); margin: 4rem auto 0; }
.legal-body .lead { color: var(--ink); font: 600 1.8rem/1.35 var(--serif); }
.legal-body h2 { margin: 3.5rem 0 1rem; font-size: 2.6rem; }
.review-line { margin-top: 3rem; padding-top: 1rem; border-top: 1px solid var(--rule); font: 800 0.68rem/1.3 var(--mono); letter-spacing: 0.06em; text-transform: uppercase; }
.not-found { display: grid; grid-template-columns: 1fr 0.8fr; gap: 5rem; align-items: center; width: min(calc(100% - 2rem), var(--max)); min-height: 640px; margin: 0 auto; padding: 5rem 0; }
.not-found h1 { margin: 1rem 0 1.5rem; font-size: clamp(4rem, 9vw, 8rem); }
.not-found p { color: var(--ink-soft); font-size: 1.2rem; }
.not-found-art { position: relative; aspect-ratio: 1; background: var(--cobalt); overflow: hidden; }
.not-found-art span { position: absolute; display: block; background: var(--paper); }
.not-found-art span:nth-child(1) { width: 52%; height: 18%; top: 12%; left: 8%; }
.not-found-art span:nth-child(2) { width: 22%; height: 55%; top: 35%; right: 12%; background: var(--vermilion); }
.not-found-art span:nth-child(3) { width: 38%; height: 35%; bottom: 10%; left: 13%; background: var(--mint); }
.not-found-art strong { position: absolute; right: 8%; bottom: 4%; color: var(--ink); font: 700 6rem/1 var(--serif); }

/* Footer */
.site-footer {
  display: grid;
  grid-template-columns: 1.5fr 0.55fr 0.55fr;
  gap: 4rem;
  padding: 4.5rem max(1rem, calc((100vw - var(--max)) / 2)) 2rem;
  color: #fff;
  background: var(--ink);
}
.footer-signal p { max-width: 650px; margin: 1.3rem 0 0; font: 600 clamp(2.7rem, 5vw, 5.2rem)/0.95 var(--serif); letter-spacing: -0.035em; }
.site-footer h2 { margin-bottom: 1.2rem; color: var(--mint); font: 800 0.67rem/1.2 var(--mono); letter-spacing: 0.11em; text-transform: uppercase; }
.site-footer > div:not(.footer-signal) { display: flex; flex-direction: column; align-items: flex-start; }
.site-footer a { margin-bottom: 0.55rem; color: #d8dce6; font-size: 0.85rem; text-decoration: none; }
.site-footer a:hover { color: var(--mint); }
.footer-fine { grid-column: 1 / -1; margin: 3rem 0 0; padding-top: 1.3rem; border-top: 1px solid #444a59; color: #8f96a6; font-size: 0.73rem; }

@media (max-width: 1050px) {
  .home-hero { grid-template-columns: 1fr; }
  .home-hero-copy { padding-right: 0; padding-bottom: 3.5rem; }
  .home-hero-visual { min-height: 540px; }
  .decision-strip, .economics-band, .method-preview, .issue-two { grid-template-columns: 1fr; gap: 3rem; }
  .guide-card-1, .guide-card-2 { grid-column: span 6; }
  .guide-card-3, .guide-card-4, .guide-card-5, .guide-card-8, .guide-card-9, .guide-card-10 { grid-column: span 4; }
  .guide-card-6, .guide-card-7 { grid-column: span 6; }
  .article-hero-grid { grid-template-columns: 1fr; }
  .article-art { max-width: 760px; }
  .article-shell { grid-template-columns: 190px minmax(0, 1fr); gap: 3rem; }
  .site-footer { grid-template-columns: 1fr 0.5fr 0.5fr; }
}

@media (max-width: 760px) {
  html { scroll-padding-top: 5rem; }
  .edition-bar { font-size: 0.56rem; }
  .edition-bar span:first-child { display: none; }
  .site-header { padding: 0.85rem 0; }
  .menu-button { display: flex; flex-direction: column; gap: 4px; width: 44px; height: 44px; align-items: center; justify-content: center; border: 1px solid var(--ink); border-radius: 0; background: transparent; cursor: pointer; }
  .menu-button > span:not(.sr-only) { width: 19px; height: 2px; background: var(--ink); transition: transform 160ms ease, opacity 160ms ease; }
  .menu-button[aria-expanded="true"] > span:nth-child(1) { transform: translateY(6px) rotate(45deg); }
  .menu-button[aria-expanded="true"] > span:nth-child(2) { opacity: 0; }
  .menu-button[aria-expanded="true"] > span:nth-child(3) { transform: translateY(-6px) rotate(-45deg); }
  .site-nav { position: absolute; top: calc(100% + 1px); right: 0; left: 0; display: none; flex-direction: column; align-items: stretch; gap: 0; padding: 0.8rem 1rem; background: var(--paper); border-bottom: 1px solid var(--ink); box-shadow: 0 18px 28px rgba(18, 24, 39, 0.13); }
  .site-nav.is-open { display: flex; }
  .site-nav a { padding: 0.8rem 0; border-bottom: 1px solid var(--rule); }
  .site-nav a::after { display: none; }
  .home-hero { min-height: auto; padding-top: 4rem; }
  .home-hero h1 { font-size: clamp(3.6rem, 18vw, 5.5rem); }
  .hero-facts { width: 100%; flex-direction: column; gap: 0.7rem; }
  .home-hero-visual { min-height: 420px; }
  .home-hero-visual img { object-position: 62% center; }
  .home-hero-visual figcaption { flex-direction: column; }
  .fact-stamp { width: 74px; height: 74px; top: 1.4rem; right: 1.4rem; }
  .decision-strip ol { grid-template-columns: repeat(2, 1fr); }
  .decision-strip li { margin-bottom: 1.5rem; }
  .section-heading { grid-template-columns: 1fr; gap: 1rem; }
  .guide-card-1, .guide-card-2, .guide-card-3, .guide-card-4, .guide-card-5, .guide-card-6, .guide-card-7, .guide-card-8, .guide-card-9, .guide-card-10 { grid-column: 1 / -1; }
  .guide-card { min-height: 260px; grid-template-columns: 50px 1fr; }
  .economics-band { gap: 2rem; }
  .economics-graphic { min-height: 300px; gap: 0.7rem; }
  .method-preview ol { grid-template-columns: 1fr; }
  .method-preview li:nth-child(odd) { border-right: 0; }
  .article-hero { padding-top: 1.2rem; }
  .article-hero-grid { padding-top: 3rem; gap: 2rem; }
  .article-hero h1 { font-size: clamp(3.5rem, 16vw, 5.5rem); }
  .article-meta { flex-direction: column; }
  .bench-answer { grid-template-columns: 1fr; gap: 1.2rem; margin-bottom: 4rem; padding: 1.4rem; }
  .article-shell { grid-template-columns: 1fr; }
  .toc-wrap { display: none; }
  .decision-grid, .comparison-pair, .calculator-grid, .result-grid, .checklist-items { grid-template-columns: 1fr; }
  .decision-grid article:last-child { grid-column: auto; }
  .source-desk h2 { font-size: 3rem; }
  .related-guides > div { grid-template-columns: 1fr; }
  .related-guides > div > a { border-right: 0; }
  .legal-hero { padding-top: 4rem; }
  .not-found { grid-template-columns: 1fr; min-height: auto; }
  .site-footer { grid-template-columns: 1fr 1fr; gap: 3rem 1.5rem; }
  .footer-signal { grid-column: 1 / -1; }
}

@media (max-width: 470px) {
  .site-brand strong { font-size: 1rem; }
  .brand-mark { width: 38px; height: 38px; }
  .home-hero, .guide-index, .method-preview, .article-hero, .bench-answer, .article-shell, .related-guides, .legal-main, .not-found { width: min(calc(100% - 1.25rem), var(--max)); }
  .home-hero-visual { min-height: 350px; }
  .decision-strip, .economics-band, .issue-two { padding-inline: 0.7rem; }
  .issue-two-visual { box-shadow: 7px 7px 0 var(--cobalt); }
  .decision-strip ol { grid-template-columns: 1fr 1fr; }
  .decision-strip li { padding: 0 0.7rem; }
  .hero-actions { width: 100%; }
  .button { width: 100%; }
  .guide-card { padding: 1.1rem; }
  .article-art { margin-inline: -0.2rem; }
  .prose p, .prose li { font-size: 1rem; }
  .calculator, .checklist-tool { padding: 1rem; box-shadow: 6px 6px 0 var(--mint); }
  .tool-heading { align-items: flex-start; flex-direction: column; }
  .site-footer { grid-template-columns: 1fr; }
  .footer-signal, .footer-fine { grid-column: 1; }
}

@media (prefers-reduced-motion: reduce) {
  *, *::before, *::after { scroll-behavior: auto !important; transition-duration: 0.01ms !important; animation-duration: 0.01ms !important; animation-iteration-count: 1 !important; }
}