:root {
  --paper: #f2eee4;
  --paper-deep: #e7e0d2;
  --ink: #17211f;
  --muted: #5b6661;
  --line: #c9c1b1;
  --blue: #154ee8;
  --blue-dark: #0d35a5;
  --mint: #b9e8d0;
  --amber: #ffd66b;
  --red: #9b2c2c;
  --white: #fffdf8;
  --shadow: 10px 10px 0 rgba(23, 33, 31, 0.11);
}

* { box-sizing: border-box; }
html { scroll-behavior: smooth; }
body { margin: 0; color: var(--ink); background: var(--paper); font-family: Inter, ui-sans-serif, -apple-system, BlinkMacSystemFont, "Segoe UI", sans-serif; line-height: 1.55; }
a { color: inherit; text-decoration-thickness: 1px; text-underline-offset: .18em; }
a:hover { color: var(--blue); }
code, pre { font-family: "SFMono-Regular", Consolas, "Liberation Mono", monospace; }
.skip-link { position: absolute; top: -5rem; left: 1rem; z-index: 20; background: var(--ink); color: white; padding: .7rem 1rem; }
.skip-link:focus { top: 1rem; }
.site-header { min-height: 76px; padding: 0 clamp(1rem, 4vw, 4rem); border-bottom: 1px solid var(--ink); display: flex; align-items: center; gap: 2rem; background: rgba(242, 238, 228, .96); position: sticky; top: 0; z-index: 10; }
.wordmark { min-height: 44px; display: inline-flex; align-items: center; gap: .7rem; font-weight: 800; text-decoration: none; letter-spacing: -.03em; font-size: 1.08rem; white-space: nowrap; }
.mark { width: 34px; height: 34px; display: inline-grid; place-items: center; background: var(--blue); color: white; font: 800 .67rem/1 ui-monospace, monospace; letter-spacing: -.05em; transform: rotate(-2deg); }
.site-header nav { display: flex; gap: 1.5rem; margin-left: auto; }
.site-header nav a { min-height: 44px; display: inline-flex; align-items: center; text-decoration: none; font-size: .9rem; font-weight: 650; }
.beta-chip, .verified, .planned, .partial, .closed { display: inline-flex; align-items: center; width: fit-content; padding: .25rem .55rem; border: 1px solid currentColor; font: 700 .69rem/1.1 ui-monospace, monospace; text-transform: uppercase; letter-spacing: .04em; }
.beta-chip { background: var(--amber); transform: rotate(1deg); }
.shell { width: min(1180px, calc(100% - 2rem)); margin-inline: auto; }
.hero { min-height: 680px; padding-block: clamp(4rem, 9vw, 8rem); display: grid; grid-template-columns: 1.1fr .9fr; gap: clamp(2rem, 7vw, 7rem); align-items: center; }
.eyebrow { margin: 0 0 1rem; color: var(--blue); font: 800 .74rem/1.2 ui-monospace, monospace; letter-spacing: .11em; text-transform: uppercase; }
.eyebrow.light { color: var(--mint); }
h1, h2, h3, p { margin-top: 0; }
h1, h2 { font-family: Georgia, "Times New Roman", serif; font-weight: 500; letter-spacing: -.045em; line-height: .98; }
h1 { margin-bottom: 1.5rem; font-size: clamp(3.5rem, 8.4vw, 7.5rem); }
h1 em, h2 em { color: var(--blue); font-weight: 400; }
h2 { font-size: clamp(2.2rem, 4.8vw, 4.4rem); }
h3 { line-height: 1.2; }
.lede { max-width: 680px; font-size: clamp(1.08rem, 2vw, 1.35rem); color: var(--muted); }
.button-row { display: flex; flex-wrap: wrap; gap: .8rem; margin-top: 2rem; }
.button { min-height: 48px; padding: .8rem 1.15rem; display: inline-flex; justify-content: center; align-items: center; border: 1px solid var(--ink); font-weight: 800; text-decoration: none; cursor: pointer; transition: transform .15s, box-shadow .15s, background-color .15s; }
.button:hover { color: inherit; transform: translate(-2px, -2px); box-shadow: 4px 4px 0 var(--ink); }
.button.primary { background: var(--blue); color: white; }
.button.primary:hover { background: var(--blue-dark); color: white; }
.button.secondary { background: transparent; }
.button:disabled { cursor: wait; opacity: .65; }
.ledger-card { background: var(--ink); color: var(--white); padding: clamp(1.4rem, 4vw, 2.4rem); box-shadow: var(--shadow); transform: rotate(1deg); }
.ledger-head { display: flex; justify-content: space-between; border-bottom: 1px solid #53605b; padding-bottom: 1rem; font: 700 .78rem/1 ui-monospace, monospace; text-transform: uppercase; }
.ledger-card .verified { color: var(--mint); }
.date-pair { margin: 2rem 0; display: grid; grid-template-columns: 1fr 1fr; gap: 1rem; }
.date-pair div { border-left: 3px solid var(--blue); padding-left: .8rem; }
.date-pair dt { color: #a9b4af; font-size: .75rem; text-transform: uppercase; }
.date-pair dd { margin: .2rem 0 0; font-weight: 800; }
.trace-list { list-style: none; padding: 0; margin: 0; border-top: 1px solid #53605b; }
.trace-list li { display: flex; justify-content: space-between; gap: 1rem; padding: .75rem 0; border-bottom: 1px solid #53605b; font-size: .86rem; color: #a9b4af; }
.trace-list li.counted { color: var(--mint); }
.source-line { margin: 1.5rem 0 0; font: .72rem/1.5 ui-monospace, monospace; color: #a9b4af; }
.proof-strip { border-block: 1px solid var(--ink); display: grid; grid-template-columns: repeat(4, 1fr); }
.proof-strip div { padding: 1.5rem clamp(1rem, 4vw, 4rem); border-right: 1px solid var(--ink); }
.proof-strip div:last-child { border-right: 0; }
.proof-strip strong { display: block; color: var(--blue); font: 500 2.4rem/1 Georgia, serif; }
.proof-strip span { color: var(--muted); font-size: .82rem; }
.section-grid { padding-block: clamp(5rem, 9vw, 8rem); display: grid; grid-template-columns: .75fr 1.25fr; gap: clamp(2rem, 7vw, 7rem); align-items: start; }
.calculator-card { padding: clamp(1.25rem, 4vw, 2.25rem); background: var(--white); border: 1px solid var(--ink); box-shadow: var(--shadow); }
.calculator-card label { display: grid; gap: .45rem; margin-bottom: 1.2rem; font-size: .78rem; font-weight: 800; text-transform: uppercase; letter-spacing: .06em; }
input, select { width: 100%; min-height: 51px; padding: .7rem .85rem; border: 1px solid var(--ink); border-radius: 0; background: white; color: var(--ink); font: 600 1rem/1.2 inherit; }
input:focus, select:focus, button:focus-visible, a:focus-visible { outline: 3px solid var(--amber); outline-offset: 2px; }
.field-row { display: grid; grid-template-columns: 1fr 1fr; gap: 1rem; }
.field-help { color: var(--muted); font-size: .83rem; }
.result { margin-top: 1.5rem; padding-top: 1.5rem; border-top: 1px solid var(--line); }
.result-placeholder { margin: 0; color: var(--muted); }
.result h3 { font: 500 2rem/1 Georgia, serif; margin-bottom: .6rem; }
.result h3.yes { color: #137248; }
.result h3.no, .result-error strong { color: var(--red); }
.result-date, .result-big-date { font-size: 1.15rem; font-weight: 800; }
.result-big-date { font: 500 clamp(2rem, 5vw, 3.5rem)/1 Georgia, serif !important; color: var(--blue); }
.result-note, .result-reasons { color: var(--muted); }
.result-kicker, .result-meta { font-family: ui-monospace, monospace; text-transform: uppercase; letter-spacing: .04em; }
.result-kicker { color: var(--blue); font-size: .75rem; font-weight: 800; }
.result-meta { display: block; color: var(--muted); font-size: .65rem; line-height: 1.5; }
.result-trace { list-style: none; padding: 0; margin: 1.5rem 0; border-top: 1px solid var(--line); }
.result-trace li { padding: .65rem 0; display: grid; grid-template-columns: minmax(150px, .55fr) 1fr; gap: 1rem; border-bottom: 1px solid var(--line); font-size: .8rem; }
.result-trace .counted span { color: #137248; font-weight: 800; }
.result-trace .skipped span { color: var(--muted); }
.ink-section { padding-block: clamp(5rem, 10vw, 9rem); background: var(--ink); color: var(--white); }
.ink-section h2 { max-width: 1000px; }
.principle-grid { margin-top: 4rem; display: grid; grid-template-columns: repeat(3, 1fr); gap: 1px; background: #53605b; border: 1px solid #53605b; }
.principle-grid article { padding: 2rem; background: var(--ink); }
.principle-grid span, .method-list > article > span { color: var(--mint); font: 800 .8rem/1 ui-monospace, monospace; }
.principle-grid h3 { margin-top: 2rem; font-size: 1.1rem; }
.principle-grid p { color: #b6c0bc; }
.coverage-section { padding-block: clamp(5rem, 10vw, 9rem); }
.section-heading { display: flex; justify-content: space-between; gap: 2rem; align-items: end; }
.section-heading > a { min-height: 44px; display: inline-flex; align-items: center; }
.table-wrap { overflow-x: auto; border: 1px solid var(--ink); background: var(--white); }
table { width: 100%; border-collapse: collapse; min-width: 720px; }
th, td { padding: 1rem; text-align: left; border-bottom: 1px solid var(--line); vertical-align: top; }
th { background: var(--ink); color: white; font: 700 .71rem/1 ui-monospace, monospace; text-transform: uppercase; letter-spacing: .06em; }
td code { display: block; margin-top: .35rem; color: var(--muted); font-size: .71rem; }
td > a:first-child { min-height: 44px; display: inline-flex; align-items: center; }
.kind { display: inline-flex; padding: .25rem .45rem; background: var(--paper-deep); font: 700 .67rem/1 ui-monospace, monospace; text-transform: uppercase; }
.kind-market { background: var(--amber); }
.kind-settlement { background: var(--mint); }
.verified { color: #137248; }
.partial { color: #8a5d00; }
.closed { color: var(--red); }
.page-hero { padding-block: clamp(4rem, 10vw, 8rem); border-bottom: 1px solid var(--ink); }
.page-hero.compact { padding-block: clamp(3rem, 7vw, 6rem); }
.page-hero h1 { max-width: 1000px; }
.tool-layout { padding-block: clamp(4rem, 9vw, 7rem); display: grid; grid-template-columns: 1.2fr .8fr; gap: clamp(2rem, 7vw, 6rem); align-items: start; }
.calculator-card.large { min-height: 460px; }
.explain-card { padding: 2rem; border-top: 5px solid var(--blue); background: var(--paper-deep); }
.explain-card h2 { font-size: 2.5rem; }
.explain-card .caution { margin-top: 2rem; padding-top: 1rem; border-top: 1px solid var(--line); font-size: .78rem; color: var(--muted); }
.card-grid { padding-block: clamp(4rem, 8vw, 7rem); display: grid; grid-template-columns: repeat(3, 1fr); gap: 1rem; }
.calendar-card { min-height: 310px; padding: 1.5rem; display: flex; flex-direction: column; border: 1px solid var(--ink); background: var(--white); text-decoration: none; transition: transform .15s, box-shadow .15s; }
.calendar-card:hover { color: inherit; transform: translate(-3px, -3px); box-shadow: 7px 7px 0 var(--ink); }
.calendar-card h2 { margin-top: 2rem; font-size: 2rem; }
.calendar-card code, .calendar-card p { color: var(--muted); }
.calendar-card .text-link { margin-top: auto; color: var(--blue); font-weight: 800; }
.source-panel { padding-block: clamp(4rem, 8vw, 7rem); display: grid; grid-template-columns: .7fr 1.3fr; gap: 4rem; }
.source-panel article { padding: 1.3rem 0; border-top: 1px solid var(--line); }
.source-panel h3 { margin-bottom: .5rem; }
.source-panel p, .source-panel small { color: var(--muted); }
.holiday-table { margin-block: 4rem 2rem; }
.holiday-table td small { display: block; color: var(--muted); }
.source-callout { margin-bottom: 5rem; padding: 1.3rem; border-left: 4px solid var(--blue); background: var(--paper-deep); }
.source-callout p { margin: 0; }
.docs-layout { padding-block: clamp(4rem, 8vw, 7rem); display: grid; grid-template-columns: 220px 1fr; gap: clamp(2rem, 7vw, 7rem); }
.docs-layout aside nav { position: sticky; top: 110px; display: grid; gap: .7rem; }
.docs-content > section { padding-bottom: 5rem; }
.docs-content h2 { font-size: clamp(2rem, 4vw, 3.5rem); }
.endpoint-list { border-top: 1px solid var(--ink); }
.endpoint-list article { display: grid; grid-template-columns: 1fr 1fr; gap: 2rem; padding: 1.2rem 0; border-bottom: 1px solid var(--line); }
.endpoint-list p { margin: 0; color: var(--muted); }
pre { overflow-x: auto; padding: 1.3rem; border: 1px solid var(--ink); background: var(--ink); color: var(--mint); font-size: .84rem; }
.method-list { padding-block: clamp(4rem, 8vw, 7rem); }
.method-list article { display: grid; grid-template-columns: 100px 1fr; gap: 2rem; padding: 2.5rem 0; border-top: 1px solid var(--ink); }
.method-list article:last-child { border-bottom: 1px solid var(--ink); }
.method-list h2 { font-size: clamp(2rem, 4vw, 3.5rem); }
.method-list p { max-width: 700px; color: var(--muted); }
.status-summary { margin-block: 4rem 2rem; padding: 1.5rem; display: flex; align-items: center; gap: 1.2rem; border: 1px solid var(--ink); background: var(--white); }
.status-summary h2 { margin-bottom: .3rem; font: 500 1.8rem/1.1 Georgia, serif; }
.status-summary p { margin: 0; color: var(--muted); }
.status-dot { flex: 0 0 auto; width: 14px; height: 14px; border-radius: 50%; background: var(--muted); box-shadow: 0 0 0 5px var(--paper-deep); }
.status-dot.good { background: #19a365; }
.status-dot.warn { background: #d99800; }
.status-dot.bad { background: #c23b3b; }
.status-row { padding: 1.2rem; display: flex; gap: 1rem; align-items: start; border-top: 1px solid var(--line); }
.status-row h3, .status-row p { margin-bottom: .25rem; }
.status-row p, .status-row small { color: var(--muted); }
.empty-state { margin-bottom: 5rem; padding: 1.5rem; background: var(--paper-deep); }
.pricing-grid { padding-block: clamp(4rem, 8vw, 7rem); display: grid; grid-template-columns: repeat(3, 1fr); gap: 1rem; align-items: stretch; }
.price-card { padding: 1.6rem; border: 1px solid var(--ink); background: var(--paper-deep); }
.price-card.active { background: var(--white); box-shadow: var(--shadow); }
.price-card h2 { margin-top: 2rem; font-size: 2.4rem; }
.price { font: 500 3rem/1 Georgia, serif; color: var(--blue); }
.price small { font: .8rem/1 sans-serif; color: var(--muted); }
.price-card ul { min-height: 170px; padding-left: 1.2rem; color: var(--muted); }
.planned { color: #775200; }
.decision-note { padding-bottom: 6rem; max-width: 800px; }
.decision-note h2 { font-size: 2.5rem; }
.site-footer { margin-top: 4rem; padding: 3rem clamp(1rem, 4vw, 4rem); display: grid; grid-template-columns: 1fr auto; gap: 2rem; border-top: 1px solid var(--ink); background: var(--paper-deep); }
.footer-mark { margin-bottom: 1rem; }
.footer-links { display: grid; grid-template-columns: 1fr 1fr; gap: .25rem 2rem; }
.footer-links a { min-height: 44px; display: inline-flex; align-items: center; }
.legal-note { grid-column: 1 / -1; max-width: 780px; padding-top: 1.2rem; border-top: 1px solid var(--line); color: var(--muted); font-size: .74rem; }

@media (max-width: 900px) {
  .site-header nav { display: none; }
  .beta-chip { margin-left: auto; }
  .hero, .section-grid, .tool-layout, .source-panel { grid-template-columns: 1fr; }
  .hero { min-height: 0; }
  .card-grid, .pricing-grid { grid-template-columns: 1fr 1fr; }
  .proof-strip { grid-template-columns: 1fr 1fr; }
  .proof-strip div:nth-child(2) { border-right: 0; }
  .proof-strip div:nth-child(-n+2) { border-bottom: 1px solid var(--ink); }
}

@media (max-width: 620px) {
  .site-header { min-height: 64px; }
  .beta-chip { display: none; }
  h1 { font-size: clamp(3rem, 16vw, 5rem); }
  .date-pair, .field-row, .principle-grid, .card-grid, .pricing-grid, .docs-layout, .site-footer { grid-template-columns: 1fr; }
  .proof-strip div { padding: 1.2rem; }
  .principle-grid { gap: 1px; }
  .section-heading { display: block; }
  .docs-layout aside nav { position: static; padding-bottom: 2rem; border-bottom: 1px solid var(--line); }
  .endpoint-list article { grid-template-columns: 1fr; gap: .5rem; }
  .method-list article { grid-template-columns: 44px 1fr; gap: 1rem; }
  .footer-links { grid-template-columns: 1fr 1fr; }
}

@media (prefers-reduced-motion: reduce) {
  html { scroll-behavior: auto; }
  *, *::before, *::after { transition: none !important; }
}