:root {
  color-scheme: light;
  --paper: #faf9f6;
  --ink: #282b2e;
  --muted: #62676c;
  --line: #dcdedb;
  --link: #315d85;
}
* { box-sizing: border-box; }
html { scroll-padding-top: 24px; }
body { margin: 0; background: var(--paper); color: var(--ink); font: 18px/1.7 Georgia, 'Times New Roman', serif; }
a { color: var(--link); text-decoration-thickness: 1px; text-underline-offset: 3px; }
a:hover { text-decoration-thickness: 2px; }
a:focus-visible, summary:focus-visible { outline: 2px solid var(--link); outline-offset: 5px; }
.wrap { width: min(100% - 48px, 760px); margin: auto; }
.site-header { display: flex; align-items: baseline; justify-content: space-between; gap: 24px; padding: 27px 0 22px; border-bottom: 1px solid var(--line); font-family: Arial, Helvetica, sans-serif; }
.brand { color: var(--ink); font-size: 24px; font-weight: 800; letter-spacing: -.9px; text-decoration: none; }
nav { display: flex; gap: 24px; font-size: 14px; }
nav a { color: var(--muted); text-decoration: none; }
nav a[aria-current='page'] { color: var(--ink); text-decoration: underline; }
.article-header { margin: 52px 0 42px; }
.date, .article-links, .aside, caption, .table-note, footer, .muted { color: var(--muted); font-family: Arial, Helvetica, sans-serif; }
.date { font-size: 14px; margin-bottom: 14px; }
h1, h2, h3 { color: var(--ink); font-family: Arial, Helvetica, sans-serif; font-weight: 600; }
h1 { font-size: clamp(32px, 5.3vw, 43px); line-height: 1.17; letter-spacing: -1.2px; margin: 0 0 25px; max-width: 730px; }
h2 { font-size: 25px; line-height: 1.3; letter-spacing: -.45px; margin: 0 0 18px; }
h3 { font-size: 19px; line-height: 1.4; margin: 30px 0 12px; }
p { margin: 0 0 20px; }
.lead { font-size: 21px; line-height: 1.6; }
.article-links { font-size: 14px; margin-top: 25px; }
section { margin: 42px 0; }
.aside { font-size: 14px; line-height: 1.6; }
.table-wrap { overflow-x: auto; margin: 24px 0 18px; }
table { width: 100%; border-collapse: collapse; font: 14px/1.5 Arial, Helvetica, sans-serif; font-variant-numeric: tabular-nums; }
caption { font-size: 13px; text-align: left; padding: 0 0 10px; }
th, td { border-bottom: 1px solid var(--line); padding: 12px 10px; text-align: left; vertical-align: top; }
th { font-weight: 500; }
thead th { border-top: 1px solid var(--line); color: var(--muted); font-size: 13px; }
th:first-child, td:first-child { padding-left: 0; }
th:last-child, td:last-child { padding-right: 0; }
.num { text-align: right; white-space: nowrap; }
.table-note { display: block; font-size: 12px; }
code { font: .85em/1.6 'Courier New', monospace; }
.formula { padding: 16px 0 16px 18px; border-left: 2px solid var(--line); margin: 24px 0; white-space: pre-wrap; overflow-wrap: anywhere; font-size: 16px; line-height: 1.6; }
.formula code { font-size: inherit; }
details { border-top: 1px solid var(--line); border-bottom: 1px solid var(--line); padding: 13px 0; margin: 25px 0; }
summary { cursor: pointer; font: 15px/1.5 Arial, Helvetica, sans-serif; }
details p { font-size: 16px; margin: 16px 0 0; }
ul { padding-left: 24px; margin: 0 0 22px; }
li { margin-bottom: 8px; }
.source-list { font-size: 16px; }
.source-list .muted { font-size: 13px; }
.log-entry { margin: 40px 0; border-top: 1px solid var(--line); padding-top: 32px; }
.log-entry h2 { font-size: 28px; }
footer { display: flex; flex-wrap: wrap; gap: 12px 24px; align-items: center; border-top: 1px solid var(--line); margin-top: 56px; padding: 22px 0 32px; font-size: 12px; }
footer span:last-child { margin-left: auto; }
.skip { position: absolute; left: 16px; top: -80px; padding: 8px 14px; background: var(--ink); color: white; font: 16px Arial, sans-serif; }
.skip:focus { top: 8px; }
@media (max-width: 520px) {
  .wrap { width: calc(100% - 36px); }
  body { font-size: 17px; }
  .site-header { padding-top: 22px; gap: 16px; }
  nav { gap: 18px; font-size: 13px; }
  .brand { font-size: 22px; }
  .article-header { margin-top: 36px; }
  h1 { letter-spacing: -.7px; }
  .lead { font-size: 19px; }
  th, td { padding: 10px 7px; }
  table { font-size: 12px; }
  thead th { font-size: 12px; }
  .table-note { font-size: 11px; }
  .formula { font-size: 12px; padding-left: 12px; }
  footer span:last-child { margin-left: 0; }
}

/* Publication layout: shared paper, blue ink, and system typography. */
:root { --accent: #244f74; --wash: #eeefeb; --sans: Arial, Helvetica, sans-serif; }
[hidden] { display: none !important; }
.wide { width: min(100% - 64px, 1120px); }
.site-header { padding: 28px 0; align-items: center; }
.brand { font-size: 34px; letter-spacing: -1.8px; }
.brand-dot { color: var(--accent); }
.site-header nav { flex-wrap: wrap; justify-content: flex-end; }
.site-header nav a { padding: 7px 0; }
a, button, input, select { -webkit-tap-highlight-color: transparent; }
a:focus-visible, button:focus-visible, input:focus-visible, select:focus-visible { outline: 2px solid var(--accent); outline-offset: 4px; }
p { text-wrap: pretty; }
h1, h2 { text-wrap: balance; }
.eyebrow { font: 11px/1.6 var(--sans); font-weight: 700; letter-spacing: 1.7px; text-transform: uppercase; color: var(--accent); margin-bottom: 18px; }
.small, .read-time { font: 12px/1.6 var(--sans); color: var(--muted); }
.meta-divider { color: var(--muted); padding: 0 8px; }
.article-header { margin: 64px 0 48px; }
.article-header h1 { font-size: clamp(36px, 5vw, 56px); max-width: 820px; }
.article-header .lead { max-width: 740px; }
.article-header .aside { max-width: 760px; }
.hero { padding: 36px 0 20px; margin: 40px 0 48px; }
.hero h1 { max-width: 1060px; font-size: clamp(42px, 6.3vw, 76px); letter-spacing: -3.3px; line-height: 1.09; font-weight: 600; margin: 24px 0 34px; }
.hero h1 em { font-family: Georgia, 'Times New Roman', serif; font-weight: 400; color: var(--accent); }
.hero-bottom { display: flex; align-items: flex-end; justify-content: space-between; gap: 36px; }
.hero-bottom .lead { max-width: 640px; margin-bottom: 0; font-size: 20px; }
.text-link { font: 14px/1.5 var(--sans); font-weight: 600; white-space: nowrap; }
.featured { display: grid; grid-template-columns: 1.45fr 1fr; gap: 60px; padding: 36px 0; border-top: 2px solid var(--ink); border-bottom: 1px solid var(--line); }
.featured h2 { font-size: clamp(26px, 3.2vw, 38px); max-width: 620px; }
.featured h2 a, .note-row h2 a { color: var(--ink); text-decoration: none; }
.featured h2 a:hover, .note-row h2 a:hover { color: var(--accent); text-decoration: underline; text-decoration-thickness: 1px; }
.featured p:not(.eyebrow) { font-size: 17px; }
.feature-stat { border-left: 1px solid var(--line); padding-left: 42px; display: flex; flex-direction: column; justify-content: center; }
.stat-number { font: 72px/1 var(--sans); letter-spacing: -4px; color: var(--accent); }
.stat-number > span { font-size: 34px; letter-spacing: -1px; }
.feature-stat p { margin: 20px 0 12px; }
.home-notes { margin: 66px 0; }
.section-heading { display: flex; justify-content: space-between; align-items: baseline; gap: 20px; margin-bottom: 20px; }
.section-heading h2 { margin: 0; font-size: 22px; }
.section-heading > a { font: 13px/1.5 var(--sans); }
.note-row { display: grid; grid-template-columns: 130px minmax(0, 1fr) 24px; gap: 30px; padding: 28px 0; border-top: 1px solid var(--line); }
.note-meta { display: flex; flex-direction: column; gap: 6px; font: 12px/1.5 var(--sans); color: var(--muted); padding-top: 6px; }
.note-meta .eyebrow { margin: 0; }
.note-row h2 { font-size: 25px; margin-bottom: 12px; }
.note-row p { font-size: 17px; margin-bottom: 10px; max-width: 680px; }
.row-arrow { font: 24px/1.5 var(--sans); text-decoration: none; padding: 5px 0; }
.archive-footnote { margin: 30px 0 60px; max-width: 680px; }
.tool-teaser { display: grid; grid-template-columns: 1.1fr 1fr; gap: 48px; padding: 38px; background: var(--wash); }
.tool-teaser h2 { font-size: 32px; }
.tool-teaser p { font-size: 17px; }
.tool-equation { display: flex; flex-direction: column; justify-content: center; align-items: center; text-align: center; font-size: clamp(21px, 2.5vw, 28px); color: var(--accent); }
.fraction-line { border-top: 1px solid var(--accent); padding-top: 10px; margin-top: 10px; }
.equation-result { margin-top: 26px; font: 12px/1.6 var(--sans); color: var(--muted); }
.button { display: inline-block; padding: 12px 18px; background: var(--accent); color: white; border: 1px solid var(--accent); font: 14px/1.5 var(--sans); text-decoration: none; cursor: pointer; border-radius: 2px; }
.button:hover { background: #163c5d; color: white; }
.follow-strip { text-align: center; padding: 24px 0 16px; }
.follow-strip h2 { font-size: 29px; }
.follow-strip p { font-size: 17px; color: var(--muted); }
.actions { display: flex; align-items: center; flex-wrap: wrap; gap: 22px; font: 14px/1.5 var(--sans); }
.follow-strip .actions { justify-content: center; }
.callout { padding: 25px 28px; background: var(--wash); border-left: 3px solid var(--accent); margin: 40px 0; }
.callout h2 { font-size: 24px; }
.callout p { font-size: 17px; }
.callout p:last-child { margin-bottom: 0; }
.related, .sources { border-top: 1px solid var(--line); padding-top: 32px; }
.principles { list-style: none; padding: 0; }
.principles li { padding: 14px 0; border-bottom: 1px solid var(--line); }
footer { padding: 30px 0 40px; align-items: flex-start; gap: 22px 30px; }
footer .footer-brand { font: 700 20px/1.5 var(--sans); letter-spacing: -.5px; color: var(--ink); text-decoration: none; }
footer .footer-line { font: 12px/1.6 var(--sans); }
footer nav { margin-left: auto; display: grid; grid-template-columns: repeat(2, auto); gap: 12px 24px; font-size: 12px; }
footer nav a { text-decoration: underline; }
.calculator-grid { display: grid; grid-template-columns: minmax(0, 1.2fr) minmax(0, 1fr); gap: 36px; align-items: start; margin: 38px 0 56px; }
fieldset { border: 0; padding: 0; margin: 0; min-width: 0; }
legend { font: 600 23px/1.4 var(--sans); margin-bottom: 24px; }
.preset-row { display: flex; gap: 18px; align-items: flex-end; margin-bottom: 12px; }
.preset-row > .field { flex: 1; }
.field { display: flex; flex-direction: column; min-width: 0; }
.field label { font: 600 14px/1.5 var(--sans); }
.field-help { font: 12px/1.5 var(--sans); color: var(--muted); margin: 4px 0 8px; }
input, select { width: 100%; min-width: 0; color: var(--ink); background: #fff; border: 1px solid #a0a7ab; border-radius: 2px; padding: 12px; font: 16px/1.4 var(--sans); font-variant-numeric: tabular-nums; }
select { margin-top: 8px; }
.input-grid { display: grid; grid-template-columns: repeat(2, minmax(0, 1fr)); gap: 22px 18px; }
.field-error, .form-error { font: 13px/1.5 var(--sans); color: #a33126; }
.field-error:not(:empty) { margin-top: 6px; }
.form-error { margin-top: 20px; }
input[aria-invalid="true"] { border: 2px solid #a33126; }
button:disabled { opacity: .45; cursor: not-allowed; }
.quiet-button { border: 1px solid var(--line); padding: 11px 13px; background: transparent; color: var(--accent); font: 13px/1.5 var(--sans); border-radius: 2px; cursor: pointer; }
.quiet-button:hover:not(:disabled) { background: #e1e6e6; }
.calculator-results { background: var(--wash); padding: 30px; margin: 0; min-width: 0; }
.result-label { font: 14px/1.5 var(--sans); margin: 24px 0 8px; }
.result-total { font: 52px/1.1 var(--sans); color: var(--accent); letter-spacing: -2px; overflow-wrap: anywhere; margin-bottom: 12px; }
.result-change { font: 13px/1.5 var(--sans); }
.cost-bars { margin: 24px 0 32px; }
.cost-bars > div { margin: 14px 0; }
.cost-bars span { display: block; font: 11px/1.5 var(--sans); color: var(--muted); margin-bottom: 5px; }
.cost-bars i { display: block; height: 7px; max-width: 100%; background: #9da8b0; }
.cost-bars #scenario-bar { background: var(--accent); }
.result-details { font: 13px/1.5 var(--sans); margin: 0 0 22px; }
.result-details > div { display: flex; justify-content: space-between; gap: 15px; border-top: 1px solid #d2d6d3; padding: 13px 0; }
.result-details dd { margin: 0; font-variant-numeric: tabular-nums; text-align: right; overflow-wrap: anywhere; min-width: 0; }
.result-tools { display: flex; flex-wrap: wrap; gap: 9px; margin-top: 24px; }
#action-status { margin: 14px 0 0; }
#share-fallback { margin-top: 15px; font: 13px/1.5 var(--sans); }
#scenario-url { margin-top: 8px; }
.calculator-method { display: grid; grid-template-columns: 1.2fr 1fr; gap: 36px; border-top: 1px solid var(--line); padding-top: 32px; }
.calculator-method p { font-size: 16px; }
.calculator-method .formula { font-size: 13px; }
@media (max-width: 800px) {
  .hero h1 { letter-spacing: -2px; }
  .hero-bottom { align-items: flex-start; flex-direction: column; gap: 20px; }
  .featured { gap: 28px; }
  .feature-stat { padding-left: 26px; }
  .stat-number { font-size: 56px; }
  .tool-teaser { padding: 26px; gap: 24px; }
  .calculator-grid { grid-template-columns: 1fr; }
  .calculator-results { max-width: 100%; }
  .calculator-method { grid-template-columns: 1fr; gap: 14px; }
}
@media (max-width: 600px) {
  .wide { width: calc(100% - 36px); }
  .site-header { gap: 16px; padding: 21px 0; }
  .brand { font-size: 29px; }
  .site-header nav { gap: 12px; font-size: 12px; }
  .hero { margin: 24px 0 32px; padding-top: 18px; }
  .hero h1 { font-size: clamp(35px, 8.7vw, 51px); letter-spacing: -1.8px; }
  .hero-bottom .lead { font-size: 18px; }
  .featured { grid-template-columns: 1fr; gap: 30px; padding-top: 28px; }
  .feature-stat { padding: 24px 0 0; border-left: 0; border-top: 1px solid var(--line); }
  .stat-number { font-size: 62px; }
  .note-row { grid-template-columns: minmax(0, 1fr) 24px; gap: 8px 12px; padding: 24px 0; }
  .note-meta { grid-column: 1 / -1; flex-direction: row; gap: 16px; padding: 0; margin-bottom: 8px; }
  .note-row h2 { font-size: 23px; }
  .tool-teaser { grid-template-columns: 1fr; }
  .tool-equation { padding: 20px 0; }
  .article-header { margin-top: 38px; }
  .article-header h1 { font-size: 37px; }
  .input-grid { gap: 20px 14px; }
  .calculator-results { padding: 24px; }
  footer { gap: 18px 26px; }
  footer nav { margin-left: 0; width: 100%; }
  .callout { padding: 20px; }
}
@media (max-width: 380px) {
  .site-header { align-items: flex-start; flex-direction: column; gap: 6px; }
  .site-header nav { gap: 22px; }
  .input-grid { grid-template-columns: 1fr; }
  .preset-row { gap: 10px; }
}