:root {
  --paper: #e9e0cd;
  --card: #fbf7ec;
  --card-2: #f4ecdb;
  --ink: #1e1a15;
  --ink-soft: #4a423a;
  --rule: #cbbc9e;
  --rule-soft: #ded3ba;
  --stamp: #9c3320;
  --stamp-soft: #f0e0da;
  --index: #1d4e79;
  --index-soft: #dfe8f0;
  --moss: #47603a;
  --moss-soft: #e2e9d9;
  --shadow: 0 1px 0 rgba(30, 26, 21, 0.06), 0 8px 22px -18px rgba(30, 26, 21, 0.5);
  --ease: cubic-bezier(0.22, 1, 0.36, 1);
  --mono: ui-monospace, "Cascadia Mono", "SF Mono", Menlo, Consolas, monospace;
  --serif: "Iowan Old Style", "Palatino Linotype", Palatino, Georgia, "Times New Roman", serif;
  --sans: ui-sans-serif, system-ui, "Segoe UI", Roboto, Helvetica, Arial, sans-serif;
}

* { box-sizing: border-box; }

html { -webkit-text-size-adjust: 100%; }

body {
  margin: 0;
  background:
    repeating-linear-gradient(0deg, transparent 0 27px, rgba(30, 26, 21, 0.035) 27px 28px),
    var(--paper);
  color: var(--ink);
  font: 400 17px/1.62 var(--sans);
  overflow-wrap: break-word;
}

a { color: var(--index); text-decoration-thickness: 1px; text-underline-offset: 2px; }
a:hover { color: var(--stamp); }
:focus-visible { outline: 2px solid var(--index); outline-offset: 2px; }

.skip {
  position: absolute; left: -9999px; top: 0; background: var(--ink); color: var(--card);
  padding: 10px 14px; z-index: 9;
}
.skip:focus { left: 8px; top: 8px; }

/* ---------------------------------------------------------------- masthead */
.top {
  background: var(--ink);
  color: var(--card);
  border-bottom: 3px solid var(--stamp);
}
.bar {
  max-width: 1140px; margin: 0 auto; padding: 12px 20px;
  display: flex; align-items: center; gap: 18px; flex-wrap: wrap;
}
.brand {
  display: inline-flex; align-items: center; gap: 10px;
  color: var(--card); font: 600 17px/1 var(--serif); text-decoration: none; letter-spacing: 0.01em;
}
.brand:hover { color: #fff; }
.mark {
  width: 30px; height: 30px; display: grid; place-items: center;
  background: var(--card); color: var(--ink); font: 700 12px/1 var(--mono);
  border: 1px solid var(--rule); border-radius: 2px;
}
.menu { display: flex; gap: 4px; flex-wrap: wrap; margin-left: auto; }
.menu a {
  color: #ded3ba; text-decoration: none; font-size: 14px; padding: 6px 9px; border-radius: 2px;
  transition: background 160ms var(--ease), color 160ms var(--ease);
}
.menu a:hover { background: rgba(233, 224, 205, 0.12); color: #fff; }
.menu a[aria-current="page"] { background: var(--card); color: var(--ink); font-weight: 600; }

/* ---------------------------------------------------------------- buttons */
.btn {
  display: inline-block; background: var(--stamp); color: #fff; text-decoration: none;
  font: 600 15px/1 var(--sans); padding: 12px 17px; border-radius: 2px;
  border: 1px solid #7d2617;
  transition: transform 160ms var(--ease), background 160ms var(--ease);
}
.btn:hover { background: #832918; color: #fff; transform: translateY(-1px); }
.btn:active { transform: translateY(0); }
.top .btn { padding: 9px 13px; font-size: 14px; }
.ghost {
  display: inline-block; color: var(--ink); text-decoration: none; font-size: 15px;
  padding: 11px 15px; border: 1px solid var(--rule); border-radius: 2px; background: var(--card);
  transition: border-color 160ms var(--ease), background 160ms var(--ease);
}
.ghost:hover { border-color: var(--ink); background: var(--card-2); }

/* ---------------------------------------------------------------- shell */
.shell { max-width: 1140px; margin: 0 auto; padding: 0 20px 64px; }

.disc {
  background: var(--stamp-soft); border: 1px solid #d9bdb2; border-left: 5px solid var(--stamp);
  color: #45201a; padding: 13px 16px; margin: 20px 0 0; border-radius: 2px;
  font-size: 14.5px; line-height: 1.58;
}
.disc b { color: var(--stamp); }
.disc em { font-style: italic; }

/* ---------------------------------------------------------------- hero */
.page-hero { margin: 26px 0 8px; }
.crumb-line {
  font: 500 12px/1 var(--mono); letter-spacing: 0.1em; text-transform: uppercase;
  color: var(--ink-soft); margin-bottom: 12px;
}
.eyebrow {
  font: 500 12.5px/1 var(--mono); letter-spacing: 0.09em; text-transform: uppercase;
  color: var(--stamp); margin-bottom: 10px;
}
h1 {
  font: 600 clamp(30px, 4.4vw, 46px)/1.1 var(--serif);
  margin: 0 0 14px; letter-spacing: -0.01em;
}
.lede { font-size: 19px; line-height: 1.55; color: var(--ink-soft); margin: 0 0 20px; max-width: 68ch; }
.hero-cta { display: flex; gap: 10px; flex-wrap: wrap; align-items: center; margin-bottom: 6px; }
.hero-grid { display: block; }

/* ---------------------------------------------------------------- prose */
main > h2, main h2 {
  font: 600 clamp(22px, 2.6vw, 29px)/1.2 var(--serif);
  margin: 40px 0 12px; padding-bottom: 8px; border-bottom: 1px solid var(--rule);
}
main h3 { font: 600 20px/1.3 var(--serif); margin: 0 0 6px; }
p { margin: 0 0 15px; }
main ul, main ol { margin: 0 0 16px; padding-left: 22px; }
main li { margin-bottom: 7px; }
strong { font-weight: 650; }
code { font: 500 14.5px/1.4 var(--mono); background: var(--card-2); padding: 1px 5px; border-radius: 2px; }

.answer {
  background: var(--card); border: 1px solid var(--rule); border-left: 5px solid var(--index);
  padding: 15px 18px; border-radius: 2px; margin: 0 0 20px; box-shadow: var(--shadow);
  font-size: 16.5px; line-height: 1.6;
}
.answer b {
  display: block; font: 600 11.5px/1 var(--mono); letter-spacing: 0.11em; text-transform: uppercase;
  color: var(--index); margin-bottom: 7px;
}

.note {
  background: var(--card-2); border: 1px dashed var(--rule); padding: 15px 17px;
  border-radius: 2px; margin: 24px 0; font-size: 15.5px;
}
.note-tag {
  font: 600 11.5px/1 var(--mono); letter-spacing: 0.11em; text-transform: uppercase;
  color: var(--stamp); display: block; margin-bottom: 7px;
}
.note p:last-child { margin-bottom: 0; }

/* ---------------------------------------------------------------- tables */
table {
  width: 100%; border-collapse: collapse; margin: 6px 0 20px; background: var(--card);
  border: 1px solid var(--rule); font-size: 15.5px;
}
caption {
  caption-side: top; text-align: left; font: 500 12.5px/1.5 var(--mono); letter-spacing: 0.04em;
  color: var(--ink-soft); padding: 0 0 8px; text-transform: none;
}
th, td { text-align: left; padding: 10px 13px; border-bottom: 1px solid var(--rule-soft); vertical-align: top; }
thead th {
  background: var(--card-2); font: 600 13px/1.3 var(--mono); letter-spacing: 0.05em;
  text-transform: uppercase; color: var(--ink-soft);
}
tbody tr:last-child td { border-bottom: 0; }

/* ---------------------------------------------------------------- chips */
.chip {
  display: inline-block; font: 500 12.5px/1 var(--mono); padding: 4px 8px; border-radius: 2px;
  border: 1px solid var(--rule); background: var(--card-2); color: var(--ink-soft); white-space: nowrap;
}
.chip-supply { background: var(--index-soft); border-color: #b6cbe0; color: #17405f; }
.chip-build { background: var(--stamp-soft); border-color: #dcc0b4; color: #7d2617; }
.chip-record { background: var(--moss-soft); border-color: #c3d1b4; color: #35492a; }

/* ---------------------------------------------------------------- signature 1: the chain */
.chain {
  background: var(--card); border: 1px solid var(--rule); border-radius: 2px;
  padding: 18px; margin: 26px 0; box-shadow: var(--shadow);
}
.chain-cap, .ledger-cap, .strip-cap {
  font: 600 12px/1.4 var(--mono); letter-spacing: 0.1em; text-transform: uppercase;
  color: var(--stamp); margin-bottom: 14px;
}
.chain-row { display: flex; gap: 8px; flex-wrap: wrap; align-items: stretch; }
.chain-stop {
  flex: 1 1 150px; min-width: 132px; background: var(--card-2); border: 1px solid var(--rule);
  border-top: 3px solid var(--index); padding: 12px 12px 13px; position: relative;
  transition: transform 180ms var(--ease), border-color 180ms var(--ease);
}
.chain-stop:hover { transform: translateY(-2px); border-color: var(--ink-soft); }
.chain-stop.last { border-top-color: var(--moss); }
.chain-stop b { display: block; font: 600 15px/1.3 var(--serif); margin-bottom: 4px; }
.chain-stop span { font-size: 13.5px; line-height: 1.5; color: var(--ink-soft); display: block; }
.chain-num {
  display: inline-grid; place-items: center; width: 22px; height: 22px; border-radius: 50%;
  background: var(--ink); color: var(--card); font: 600 12px/1 var(--mono); margin-bottom: 8px;
}
.chain-arrow { align-self: center; color: var(--rule); font: 600 16px/1 var(--mono); }
.chain-legend { list-style: none; margin: 18px 0 0; padding: 0; }
.chain-legend li {
  display: flex; gap: 10px; align-items: flex-start; padding: 9px 0;
  border-top: 1px dotted var(--rule); font-size: 15.5px;
}
.chain-legend li:first-child { border-top: 1px solid var(--rule); }
.chain-legend .chain-num { flex: 0 0 22px; margin: 1px 0 0; }

/* ---------------------------------------------------------------- signature 2: the variant ledger */
.variant-ledger {
  background: var(--card); border: 1px solid var(--rule); border-radius: 2px;
  padding: 18px; margin: 26px 0; box-shadow: var(--shadow);
}
.ledger-row {
  display: grid; grid-template-columns: 0.9fr 1.1fr 1.4fr; gap: 10px;
  padding: 11px 0; border-top: 1px dotted var(--rule); font-size: 15px;
}
.ledger-row:first-of-type { border-top: 1px solid var(--rule); }
.ledger-row > div b { display: block; font: 600 15px/1.3 var(--serif); }
.ledger-key {
  font: 500 11.5px/1 var(--mono); letter-spacing: 0.08em; text-transform: uppercase;
  color: var(--ink-soft); display: block; margin-bottom: 5px;
}
.ledger-note {
  margin: 16px 0 0; padding: 13px 15px; background: var(--card-2); border: 1px dashed var(--rule);
  font-size: 15px;
}
.ledger-note b { color: var(--stamp); }

/* ---------------------------------------------------------------- stamp */
.stamp {
  display: inline-block; transform: rotate(-3.2deg); border: 2px solid var(--stamp);
  color: var(--stamp); padding: 7px 12px; margin: 4px 0 18px;
  font: 600 12.5px/1.3 var(--mono); letter-spacing: 0.09em; text-transform: uppercase;
  border-radius: 3px; background: rgba(156, 51, 32, 0.04);
}

/* ---------------------------------------------------------------- figures */
.calc {
  background: var(--ink); color: #efe7d8; padding: 17px 19px; border-radius: 2px;
  font: 400 15px/1.75 var(--mono); margin: 6px 0 20px; overflow-x: auto;
  border-left: 5px solid var(--index);
}
.calc b { color: #fff; }

.pair { display: grid; grid-template-columns: 1fr 1fr; gap: 0; margin: 8px 0 20px; }
.pair-side { background: var(--card); border: 1px solid var(--rule); padding: 16px 18px; }
.pair-side.second { border-left: 0; background: var(--card-2); }
.pair-side p:last-child { margin-bottom: 0; }
.pair-head {
  font: 600 11.5px/1 var(--mono); letter-spacing: 0.1em; text-transform: uppercase;
  color: var(--index); margin-bottom: 9px;
}

.steps { list-style: none; counter-reset: s; margin: 6px 0 22px; padding: 0; }
.steps li {
  counter-increment: s; position: relative; padding: 14px 16px 14px 58px;
  background: var(--card); border: 1px solid var(--rule); border-radius: 2px; margin-bottom: 9px;
}
.steps li::before {
  content: counter(s, decimal-leading-zero); position: absolute; left: 16px; top: 14px;
  font: 600 15px/1 var(--mono); color: var(--stamp);
}
.steps li b { display: block; font: 600 16px/1.3 var(--serif); margin-bottom: 3px; }
.steps li p { margin: 0; font-size: 15.5px; }

.myth-grid { display: grid; grid-template-columns: 1fr 1fr; gap: 12px; margin: 8px 0 22px; }
.myth {
  background: var(--card); border: 1px solid var(--rule); border-radius: 2px; padding: 15px 16px;
}
.myth h3 { font-size: 17px; margin-bottom: 8px; }
.myth p { font-size: 15.5px; margin: 0; }
.verdict {
  display: inline-block; font: 600 11.5px/1 var(--mono); letter-spacing: 0.09em;
  text-transform: uppercase; padding: 4px 7px; border-radius: 2px; margin-bottom: 8px;
}
.verdict.false { background: var(--stamp-soft); color: #7d2617; border: 1px solid #dcc0b4; }
.verdict.half { background: var(--index-soft); color: #17405f; border: 1px solid #b6cbe0; }
.verdict.true { background: var(--moss-soft); color: #35492a; border: 1px solid #c3d1b4; }

.ctaband {
  display: flex; gap: 16px; align-items: center; justify-content: space-between; flex-wrap: wrap;
  background: var(--card-2); border: 1px solid var(--rule); border-left: 5px solid var(--stamp);
  padding: 16px 18px; margin: 28px 0; border-radius: 2px;
}
.ctaband p { margin: 0; font-size: 15.5px; max-width: 62ch; }

/* ---------------------------------------------------------------- footer */
.footer { background: var(--ink); color: #d8cdb6; margin-top: 40px; border-top: 3px solid var(--stamp); }
.foot-grid {
  max-width: 1140px; margin: 0 auto; padding: 34px 20px 8px;
  display: grid; grid-template-columns: 1.6fr 1fr 1fr; gap: 26px;
}
.footer .brand { color: var(--card); margin-bottom: 10px; }
.footer .mark { background: var(--card); }
.footer p { font-size: 14.5px; line-height: 1.6; color: #c3b8a1; }
.footer strong {
  display: block; font: 600 12px/1 var(--mono); letter-spacing: 0.1em; text-transform: uppercase;
  color: var(--card); margin-bottom: 11px;
}
.footer .foot-grid a:not(.brand) {
  display: block; color: #d8cdb6; text-decoration: none; font-size: 14.5px; padding: 4px 0;
  transition: color 150ms var(--ease), transform 150ms var(--ease);
}
.footer .foot-grid a:not(.brand):hover { color: #fff; transform: translateX(2px); }
.fine {
  max-width: 1140px; margin: 0 auto; padding: 18px 20px 34px; font-size: 13.5px;
  line-height: 1.66; color: #b0a48d; border-top: 1px solid #3a332b; margin-top: 20px;
}

/* ---------------------------------------------------------------- responsive */
@media (max-width: 900px) {
  .foot-grid { grid-template-columns: 1fr 1fr; }
  .ledger-row { grid-template-columns: 1fr; gap: 4px; }
  .ledger-row > div { padding-bottom: 6px; }
}
@media (max-width: 720px) {
  body { font-size: 16.5px; }
  .menu { width: 100%; margin-left: 0; }
  .menu a { padding: 6px 8px; }
  .pair { grid-template-columns: 1fr; }
  .pair-side.second { border-left: 1px solid var(--rule); border-top: 0; }
  .myth-grid { grid-template-columns: 1fr; }
  .shell { padding: 0 15px 48px; }
  .foot-grid { grid-template-columns: 1fr; }
}

@media (prefers-reduced-motion: reduce) {
  * { transition: none !important; animation: none !important; transform: none !important; }
}