:root {
  --ink: #07131f;
  --ink-2: #122638;
  --paper: #f7f4ed;
  --paper-2: #ece9e1;
  --white: #fff;
  --muted: #607080;
  --line: rgba(7, 19, 31, 0.16);
  --blue: #2b7fff;
  --cyan: #69f2d0;
  --cyan-dark: #087d68;
  --amber: #f2b84b;
  --rose: #e36f79;
  --max: 1220px;
  --prose: 770px;
  --display: "Hiragino Sans", "Yu Gothic", "YuGothic", "Noto Sans JP", system-ui, sans-serif;
  --serif: "Yu Mincho", "YuMincho", "Hiragino Mincho ProN", "Noto Serif JP", serif;
}

* {
  box-sizing: border-box;
}

html {
  scroll-behavior: smooth;
}

body {
  margin: 0;
  color: var(--ink);
  background: var(--paper);
  font-family: var(--display);
  font-size: 16px;
  line-height: 1.85;
  text-rendering: optimizeLegibility;
  -webkit-font-smoothing: antialiased;
}

body::selection {
  color: var(--white);
  background: var(--blue);
}

a {
  color: inherit;
  text-decoration-thickness: 1px;
  text-underline-offset: 0.2em;
}

button,
summary {
  font: inherit;
}

button {
  color: inherit;
}

img,
svg {
  max-width: 100%;
}

code {
  padding: 0.12em 0.35em;
  border: 1px solid rgba(7, 19, 31, 0.12);
  border-radius: 0.3em;
  background: rgba(255, 255, 255, 0.58);
  font-family: ui-monospace, SFMono-Regular, Menlo, Consolas, monospace;
  font-size: 0.86em;
}

sup {
  margin-left: 0.12em;
  font-size: 0.66em;
  line-height: 0;
}

sup a {
  display: inline-grid;
  width: 1.55em;
  height: 1.55em;
  place-items: center;
  border-radius: 50%;
  color: var(--white);
  background: var(--blue);
  text-decoration: none;
  font-weight: 800;
}

.reading-progress {
  position: fixed;
  inset: 0 0 auto;
  z-index: 100;
  height: 3px;
  pointer-events: none;
}

.reading-progress span {
  display: block;
  width: 0;
  height: 100%;
  background: linear-gradient(90deg, var(--blue), var(--cyan));
  transform-origin: left;
}

.site-header {
  position: absolute;
  z-index: 10;
  inset: 0 0 auto;
  display: flex;
  width: min(calc(100% - 48px), var(--max));
  margin: 0 auto;
  padding: 26px 0;
  align-items: center;
  justify-content: space-between;
  color: var(--white);
}

.brand {
  display: inline-flex;
  align-items: center;
  gap: 11px;
  color: inherit;
  text-decoration: none;
}

.brand-mark {
  display: grid;
  width: 32px;
  height: 32px;
  place-items: center;
  border: 1px solid currentColor;
  border-radius: 50%;
  font-weight: 900;
  line-height: 1;
}

.brand span:last-child {
  display: grid;
  gap: 1px;
}

.brand b {
  font-size: 0.84rem;
  letter-spacing: 0.11em;
}

.brand small {
  font-size: 0.51rem;
  letter-spacing: 0.18em;
  opacity: 0.65;
}

.site-header nav {
  display: flex;
  align-items: center;
  gap: 24px;
}

.site-header nav a {
  color: rgba(255, 255, 255, 0.72);
  font-size: 0.76rem;
  font-weight: 700;
  letter-spacing: 0.04em;
  text-decoration: none;
}

.site-header nav a:hover,
.site-header nav a:focus-visible {
  color: var(--white);
}

.site-header .nav-all {
  padding: 7px 13px;
  border: 1px solid rgba(255, 255, 255, 0.28);
  border-radius: 999px;
}

.hero {
  position: relative;
  overflow: hidden;
  min-height: min(960px, 100vh);
  color: var(--white);
  background:
    linear-gradient(rgba(255, 255, 255, 0.035) 1px, transparent 1px),
    linear-gradient(90deg, rgba(255, 255, 255, 0.035) 1px, transparent 1px),
    radial-gradient(circle at 78% 28%, rgba(43, 127, 255, 0.28), transparent 27%),
    radial-gradient(circle at 14% 74%, rgba(105, 242, 208, 0.09), transparent 24%),
    var(--ink);
  background-size: 54px 54px, 54px 54px, auto, auto, auto;
}

.hero::before {
  position: absolute;
  inset: 0;
  content: "";
  background: linear-gradient(90deg, transparent 49.86%, rgba(105, 242, 208, 0.26) 49.9%, rgba(105, 242, 208, 0.26) 50.1%, transparent 50.14%);
  pointer-events: none;
}

.hero::after {
  position: absolute;
  top: 0;
  bottom: 0;
  left: 50%;
  width: 120px;
  content: "";
  background: linear-gradient(90deg, transparent, rgba(43, 127, 255, 0.07), transparent);
  transform: translateX(-50%);
  pointer-events: none;
}

.hero-inner {
  position: relative;
  z-index: 2;
  width: min(calc(100% - 48px), 1110px);
  margin: 0 auto;
  padding: clamp(128px, 15vh, 164px) 0 48px;
}

.hero-orbit {
  position: absolute;
  border: 1px solid rgba(105, 242, 208, 0.16);
  border-radius: 50%;
  pointer-events: none;
}

.orbit-a {
  top: 18%;
  right: -20vw;
  width: 56vw;
  height: 56vw;
}

.orbit-b {
  top: 34%;
  right: -7vw;
  width: 30vw;
  height: 30vw;
}

.eyebrow,
.section-kicker {
  margin: 0 0 20px;
  font-size: 0.68rem;
  font-weight: 800;
  letter-spacing: 0.16em;
  text-transform: uppercase;
}

.eyebrow {
  color: rgba(255, 255, 255, 0.6);
}

.eyebrow span {
  display: inline-block;
  margin-right: 12px;
  padding: 5px 10px;
  border-radius: 999px;
  color: var(--ink);
  background: var(--cyan);
  letter-spacing: 0.12em;
}

.hero h1 {
  max-width: 1080px;
  margin: 0;
  font-size: clamp(2.45rem, 5.2vw, 4.9rem);
  font-weight: 750;
  letter-spacing: -0.065em;
  line-height: 1.08;
}

.hero h1 em {
  color: var(--cyan);
  font-style: normal;
}

.hero-deck {
  max-width: 800px;
  margin: 28px 0 34px;
  color: rgba(255, 255, 255, 0.76);
  font-family: var(--serif);
  font-size: clamp(1.08rem, 1.7vw, 1.35rem);
  line-height: 1.8;
}

.hero-deck strong {
  color: var(--white);
  font-family: var(--display);
}

.first-answer {
  border-top: 1px solid rgba(255, 255, 255, 0.2);
  border-bottom: 1px solid rgba(255, 255, 255, 0.2);
}

.answer-lead {
  display: grid;
  grid-template-columns: 150px 1fr;
  gap: 24px;
  padding: 22px 0;
  align-items: start;
}

.status {
  display: inline-flex;
  width: fit-content;
  padding: 4px 9px;
  border-radius: 999px;
  font-size: 0.62rem;
  font-weight: 900;
  letter-spacing: 0.08em;
  line-height: 1.5;
}

.status.hypothesis {
  color: #231808;
  background: var(--amber);
}

.status.fact {
  color: #042b24;
  background: var(--cyan);
}

.answer-lead p {
  max-width: 820px;
  margin: 0;
  color: rgba(255, 255, 255, 0.76);
  font-size: clamp(0.96rem, 1.25vw, 1.1rem);
  line-height: 1.75;
}

.answer-lead strong {
  color: var(--white);
}

.answer-grid {
  display: grid;
  grid-template-columns: repeat(4, 1fr);
  margin: 0;
  border-top: 1px solid rgba(255, 255, 255, 0.12);
}

.answer-grid > div {
  padding: 16px 18px 18px;
  border-right: 1px solid rgba(255, 255, 255, 0.12);
}

.answer-grid > div:first-child {
  padding-left: 0;
}

.answer-grid > div:last-child {
  padding-right: 0;
  border-right: 0;
}

.answer-grid dt {
  margin-bottom: 6px;
  color: var(--cyan);
  font-size: 0.64rem;
  font-weight: 900;
  letter-spacing: 0.08em;
}

.answer-grid dd {
  margin: 0;
  color: rgba(255, 255, 255, 0.68);
  font-size: 0.76rem;
  line-height: 1.65;
}

.hero-meta {
  display: flex;
  margin-top: 18px;
  gap: 8px 18px;
  flex-wrap: wrap;
  color: rgba(255, 255, 255, 0.43);
  font-size: 0.65rem;
  letter-spacing: 0.06em;
}

.hero-meta span::before {
  margin-right: 7px;
  color: var(--cyan);
  content: "•";
}

.section-dark {
  color: var(--white);
  background: var(--ink);
}

.section-shell,
.final-shell,
.sources-shell,
.related-shell,
.faq-shell {
  width: min(calc(100% - 48px), var(--max));
  margin: 0 auto;
}

.main-figure {
  position: relative;
  padding: clamp(84px, 11vw, 150px) 0;
  background:
    radial-gradient(circle at 15% 45%, rgba(43, 127, 255, 0.12), transparent 22%),
    linear-gradient(180deg, #07131f, #0b1d2c);
}

.section-kicker {
  color: rgba(255, 255, 255, 0.4);
}

.section-kicker.ink {
  color: var(--blue);
}

.section-kicker.cyan {
  color: var(--cyan);
}

.section-heading {
  display: grid;
  grid-template-columns: minmax(0, 1.35fr) minmax(280px, 0.65fr);
  gap: 70px;
  margin-bottom: 54px;
  align-items: end;
}

.section-heading > div {
  display: flex;
  gap: 18px;
  align-items: flex-start;
}

.section-no {
  margin-top: 0.55em;
  color: var(--cyan);
  font-size: 0.72rem;
  font-weight: 900;
}

.section-heading h2,
.prose > h2,
.final-shell > h2,
.sources-heading h2,
.related-shell > h2,
.faq-shell > h2 {
  margin: 0;
  font-size: clamp(2.25rem, 4.9vw, 4.65rem);
  font-weight: 730;
  letter-spacing: -0.055em;
  line-height: 1.13;
}

.section-heading > p {
  margin: 0 0 0.3em;
  color: rgba(255, 255, 255, 0.58);
  font-size: 0.9rem;
  line-height: 1.85;
}

.boundary-lab {
  overflow: hidden;
  border: 1px solid rgba(255, 255, 255, 0.17);
  border-radius: 2px;
  background: rgba(255, 255, 255, 0.025);
}

.mode-tabs {
  display: grid;
  grid-template-columns: repeat(3, 1fr);
  border-bottom: 1px solid rgba(255, 255, 255, 0.16);
}

.mode-tabs button {
  display: flex;
  min-height: 70px;
  padding: 16px 18px;
  border: 0;
  border-right: 1px solid rgba(255, 255, 255, 0.14);
  color: rgba(255, 255, 255, 0.54);
  background: transparent;
  align-items: center;
  justify-content: center;
  gap: 11px;
  cursor: pointer;
  font-size: 0.82rem;
  font-weight: 800;
  transition: color 180ms ease, background 180ms ease;
}

.mode-tabs button:last-child {
  border-right: 0;
}

.mode-tabs button span {
  color: rgba(255, 255, 255, 0.28);
  font-size: 0.62rem;
}

.mode-tabs button[aria-selected="true"] {
  color: var(--ink);
  background: var(--cyan);
}

.mode-tabs button[aria-selected="true"] span {
  color: rgba(7, 19, 31, 0.52);
}

.mode-tabs button:focus-visible,
.factor-switch:focus-visible {
  z-index: 1;
  outline: 3px solid var(--amber);
  outline-offset: -3px;
}

.boundary-stage {
  position: relative;
  display: grid;
  grid-template-columns: 1fr 0.76fr 1fr;
  min-height: 390px;
  align-items: stretch;
}

.institution {
  position: relative;
  padding: 76px 44px 50px;
  background:
    linear-gradient(rgba(255, 255, 255, 0.028) 1px, transparent 1px),
    linear-gradient(90deg, rgba(255, 255, 255, 0.028) 1px, transparent 1px);
  background-size: 24px 24px;
}

.institution-a {
  border-right: 1px solid rgba(255, 255, 255, 0.1);
}

.institution-b {
  border-left: 1px solid rgba(255, 255, 255, 0.1);
}

.institution-index {
  position: absolute;
  top: 24px;
  right: 28px;
  display: grid;
  width: 36px;
  height: 36px;
  place-items: center;
  border: 1px solid rgba(255, 255, 255, 0.18);
  border-radius: 50%;
  color: rgba(255, 255, 255, 0.5);
  font-size: 0.72rem;
  font-weight: 900;
}

.institution-type {
  margin: 0;
  color: var(--blue);
  font-size: 0.62rem;
  font-weight: 900;
  letter-spacing: 0.16em;
}

.institution h3 {
  margin: 6px 0 26px;
  font-size: clamp(1.25rem, 2.3vw, 2rem);
  letter-spacing: -0.03em;
}

.institution ul {
  margin: 0;
  padding: 0;
  list-style: none;
}

.institution li {
  padding: 8px 0;
  border-top: 1px solid rgba(255, 255, 255, 0.11);
  color: rgba(255, 255, 255, 0.55);
  font-size: 0.78rem;
}

.boundary-gate {
  position: relative;
  display: grid;
  min-width: 0;
  place-items: center;
  align-content: center;
  background:
    repeating-linear-gradient(135deg, transparent 0 12px, rgba(255, 255, 255, 0.024) 12px 13px);
}

.gate-title {
  position: absolute;
  top: 24px;
  color: rgba(255, 255, 255, 0.38);
  font-size: 0.64rem;
  font-weight: 900;
  letter-spacing: 0.13em;
}

.gate-line {
  position: absolute;
  right: 0;
  left: 0;
  height: 1px;
  background: rgba(255, 255, 255, 0.18);
}

.gate-pulse {
  position: absolute;
  top: -3px;
  left: 48%;
  width: 7px;
  height: 7px;
  border-radius: 50%;
  background: var(--muted);
  box-shadow: 0 0 0 0 rgba(105, 242, 208, 0);
}

.asset-token {
  position: relative;
  z-index: 2;
  display: grid;
  width: 96px;
  height: 96px;
  place-items: center;
  border: 1px solid rgba(255, 255, 255, 0.16);
  border-radius: 50%;
  color: rgba(255, 255, 255, 0.28);
  background: var(--ink);
  transition: color 250ms ease, border-color 250ms ease, box-shadow 250ms ease, transform 250ms ease;
}

.asset-token span {
  position: absolute;
  font-size: 2.4rem;
  font-weight: 300;
  line-height: 1;
}

.asset-token b {
  opacity: 0;
  font-size: 1rem;
  letter-spacing: 0.06em;
  transition: opacity 180ms ease;
}

.gate-action {
  position: absolute;
  bottom: 35px;
  width: 100%;
  margin: 0;
  color: rgba(255, 255, 255, 0.46);
  font-size: 0.68rem;
  font-weight: 800;
  text-align: center;
}

.mode-result {
  display: grid;
  grid-template-columns: 150px 1fr minmax(300px, 1.45fr);
  gap: 30px;
  padding: 28px 34px;
  border-top: 1px solid rgba(255, 255, 255, 0.14);
  align-items: center;
}

.result-label {
  display: grid;
}

.result-label span {
  color: rgba(255, 255, 255, 0.42);
  font-size: 0.61rem;
  font-weight: 800;
}

.result-label strong {
  color: var(--rose);
  font-size: 1.25rem;
  letter-spacing: -0.03em;
}

.strength-meter {
  overflow: hidden;
  height: 5px;
  background: rgba(255, 255, 255, 0.09);
}

.strength-meter span {
  display: block;
  width: 6%;
  height: 100%;
  background: var(--rose);
  transition: width 350ms ease, background 350ms ease;
}

.result-copy h3 {
  margin: 0;
  font-size: 1rem;
}

.result-copy p {
  margin: 5px 0 0;
  color: rgba(255, 255, 255, 0.55);
  font-size: 0.74rem;
  line-height: 1.65;
}

.figure-conclusion {
  display: grid;
  grid-template-columns: 150px 1fr;
  gap: 28px;
  padding: 25px 34px;
  border-top: 1px solid rgba(255, 255, 255, 0.14);
  background: rgba(105, 242, 208, 0.055);
}

.figure-conclusion span {
  color: var(--cyan);
  font-size: 0.64rem;
  font-weight: 900;
  letter-spacing: 0.08em;
}

.figure-conclusion p {
  margin: 0;
  color: rgba(255, 255, 255, 0.75);
  font-size: 0.9rem;
}

.figure-conclusion b,
.figure-conclusion strong {
  color: var(--white);
}

.boundary-lab[data-mode="offledger"] .asset-token {
  border-color: rgba(242, 184, 75, 0.7);
  color: var(--amber);
  transform: scale(0.94);
}

.boundary-lab[data-mode="offledger"] .asset-token span {
  display: none;
}

.boundary-lab[data-mode="offledger"] .asset-token b {
  opacity: 1;
}

.boundary-lab[data-mode="offledger"] .gate-pulse {
  background: var(--amber);
}

.boundary-lab[data-mode="offledger"] .result-label strong {
  color: var(--amber);
}

.boundary-lab[data-mode="offledger"] .strength-meter span {
  width: 34%;
  background: var(--amber);
}

.boundary-lab[data-mode="cross"] .asset-token {
  border-color: var(--cyan);
  color: var(--cyan);
  box-shadow: 0 0 45px rgba(105, 242, 208, 0.2);
}

.boundary-lab[data-mode="cross"] .asset-token span {
  display: none;
}

.boundary-lab[data-mode="cross"] .asset-token b {
  opacity: 1;
}

.boundary-lab[data-mode="cross"] .gate-pulse {
  background: var(--cyan);
  animation: pulse 1.8s infinite;
}

.boundary-lab[data-mode="cross"] .result-label strong {
  color: var(--cyan);
}

.boundary-lab[data-mode="cross"] .strength-meter span {
  width: 78%;
  background: linear-gradient(90deg, var(--blue), var(--cyan));
}

@keyframes pulse {
  0% { left: 8%; box-shadow: 0 0 0 0 rgba(105, 242, 208, 0.38); }
  55% { box-shadow: 0 0 0 10px rgba(105, 242, 208, 0); }
  100% { left: 90%; box-shadow: 0 0 0 0 rgba(105, 242, 208, 0); }
}

.figure-caption {
  max-width: 760px;
  margin: 17px 0 0 auto;
  color: rgba(255, 255, 255, 0.38);
  font-size: 0.65rem;
  text-align: right;
}

.figure-caption b {
  color: rgba(255, 255, 255, 0.62);
}

.content-section {
  padding: clamp(90px, 12vw, 160px) 0;
  background: var(--paper);
}

.content-section.pale {
  background: var(--paper-2);
}

.content-section.dark-ink {
  color: var(--white);
  background:
    linear-gradient(rgba(255, 255, 255, 0.025) 1px, transparent 1px),
    var(--ink-2);
  background-size: 100% 42px;
}

.article-grid {
  display: grid;
  width: min(calc(100% - 48px), 1080px);
  margin: 0 auto;
  grid-template-columns: 150px minmax(0, var(--prose));
  gap: 70px;
}

.margin-label {
  position: sticky;
  top: 32px;
  height: fit-content;
  padding-top: 5px;
}

.margin-label span {
  color: var(--blue);
  font-size: 0.74rem;
  font-weight: 900;
}

.margin-label p {
  margin: 11px 0 0;
  color: rgba(7, 19, 31, 0.38);
  font-size: 0.57rem;
  font-weight: 900;
  letter-spacing: 0.15em;
  line-height: 1.6;
}

.dark-ink .margin-label span {
  color: var(--cyan);
}

.dark-ink .margin-label p {
  color: rgba(255, 255, 255, 0.3);
}

.prose > h2 {
  margin-bottom: 32px;
  font-size: clamp(2.15rem, 4.5vw, 4rem);
}

.prose .lede {
  margin: 0 0 48px;
  padding-left: 22px;
  border-left: 2px solid var(--blue);
  color: #344656;
  font-family: var(--serif);
  font-size: clamp(1.08rem, 1.7vw, 1.3rem);
  line-height: 1.95;
}

.dark-ink .prose .lede {
  border-left-color: var(--cyan);
  color: rgba(255, 255, 255, 0.68);
}

.explain-flow {
  margin: 48px 0 70px;
  border-top: 1px solid var(--line);
}

.explain-flow > div {
  display: grid;
  grid-template-columns: 110px 1fr;
  gap: 24px;
  padding: 25px 0;
  border-bottom: 1px solid var(--line);
}

.explain-flow > div > span {
  padding-top: 0.25em;
  color: var(--blue);
  font-size: 0.68rem;
  font-weight: 900;
  letter-spacing: 0.07em;
}

.explain-flow p {
  margin: 0;
  font-size: 0.97rem;
  line-height: 1.95;
}

.explain-flow.compact {
  margin: 24px 0 0;
}

.explain-flow.compact > div {
  grid-template-columns: 90px 1fr;
  padding: 20px 0;
}

.rail-figure,
.cost-figure,
.switch-figure,
.evidence-ruler {
  margin: 70px 0 0;
  border-top: 3px solid var(--ink);
}

figure > figcaption {
  display: flex;
  padding: 16px 0 22px;
  align-items: baseline;
  justify-content: space-between;
  gap: 18px;
}

figure > figcaption span {
  color: var(--blue);
  font-size: 0.6rem;
  font-weight: 900;
  letter-spacing: 0.12em;
}

figure > figcaption b {
  font-size: 0.94rem;
}

.rail-map {
  display: grid;
  grid-template-columns: 1fr 160px 1fr;
  border: 1px solid var(--line);
}

.rail {
  padding: 28px;
}

.rail-name {
  display: flex;
  margin-bottom: 20px;
  align-items: baseline;
  justify-content: space-between;
}

.rail-name span {
  color: var(--blue);
  font-size: 0.58rem;
  font-weight: 900;
  letter-spacing: 0.12em;
}

.rail-name strong {
  font-size: 0.85rem;
}

.rail ol {
  display: grid;
  margin: 0;
  padding: 0;
  gap: 8px;
  list-style: none;
}

.rail li {
  position: relative;
  display: grid;
  min-height: 66px;
  padding: 12px 16px;
  border: 1px solid var(--line);
  background: rgba(255, 255, 255, 0.45);
  align-content: center;
}

.rail li:not(:last-child)::after {
  position: absolute;
  z-index: 1;
  bottom: -13px;
  left: 50%;
  content: "↓";
  color: var(--blue);
  font-size: 0.74rem;
}

.rail li b {
  font-size: 0.76rem;
}

.rail li small {
  color: var(--muted);
  font-size: 0.63rem;
}

.rail .xrp-step {
  border-color: var(--blue);
  color: var(--white);
  background: var(--blue);
}

.rail .xrp-step small {
  color: rgba(255, 255, 255, 0.7);
}

.choice-gate {
  display: grid;
  padding: 24px 14px;
  border-right: 1px solid var(--line);
  border-left: 1px solid var(--line);
  color: var(--white);
  background: var(--ink);
  place-items: center;
  align-content: center;
  text-align: center;
}

.choice-gate span {
  color: var(--cyan);
  font-size: 0.59rem;
  font-weight: 900;
}

.choice-gate strong {
  margin: 4px 0;
  font-size: 0.98rem;
}

.choice-gate small {
  color: rgba(255, 255, 255, 0.45);
  font-size: 0.61rem;
}

.not-autobridge {
  display: grid;
  grid-template-columns: 44px 1fr;
  gap: 16px;
  padding: 20px 24px;
  color: #4d302f;
  background: #f3d9d5;
  align-items: center;
}

.not-autobridge > span {
  display: grid;
  width: 36px;
  height: 36px;
  place-items: center;
  border: 1px solid currentColor;
  border-radius: 50%;
  font-size: 1.3rem;
}

.not-autobridge p {
  margin: 0;
  font-size: 0.77rem;
  line-height: 1.65;
}

.reason-block {
  display: grid;
  grid-template-columns: 52px 1fr;
  gap: 24px;
  margin: 70px 0 0;
}

.reason-number {
  display: grid;
  width: 46px;
  height: 46px;
  place-items: center;
  border: 1px solid var(--ink);
  border-radius: 50%;
  font-size: 0.8rem;
  font-weight: 900;
}

.reason-block h3 {
  margin: 0;
  font-size: clamp(1.5rem, 2.7vw, 2.25rem);
  letter-spacing: -0.045em;
  line-height: 1.35;
}

blockquote {
  margin: 32px 0 0;
  padding: 28px 30px;
  border: 0;
  color: var(--white);
  background: var(--ink);
}

blockquote p {
  margin: 0;
  font-family: var(--serif);
  font-size: clamp(1.05rem, 1.7vw, 1.25rem);
  line-height: 1.9;
}

blockquote strong {
  color: var(--cyan);
  font-family: var(--display);
}

.cost-figure {
  margin-top: 90px;
}

.cost-equation {
  display: grid;
  grid-template-columns: 118px 28px 1fr 28px 1fr;
  min-height: 260px;
  border: 1px solid var(--line);
  align-items: stretch;
}

.equation-left,
.cost-stack {
  display: grid;
  padding: 24px 20px;
  align-content: center;
}

.equation-left {
  color: var(--white);
  background: var(--ink);
}

.equation-left span,
.cost-stack > span {
  margin-bottom: 8px;
  font-size: 0.57rem;
  font-weight: 900;
  letter-spacing: 0.1em;
}

.equation-left strong {
  font-size: 1.1rem;
}

.operator {
  display: grid;
  color: var(--muted);
  place-items: center;
  font-size: 1.35rem;
  font-weight: 300;
}

.cost-stack {
  gap: 8px;
}

.cost-stack b {
  padding: 8px 10px;
  border-bottom: 1px solid var(--line);
  font-size: 0.74rem;
}

.cost-up {
  background: rgba(227, 111, 121, 0.08);
}

.cost-up > span {
  color: #a1424b;
}

.cost-down {
  background: rgba(105, 242, 208, 0.13);
}

.cost-down > span {
  color: var(--cyan-dark);
}

.equation-rule {
  margin: 0;
  padding: 18px 22px;
  color: rgba(255, 255, 255, 0.68);
  background: var(--ink);
  font-size: 0.75rem;
}

.winner-lines {
  margin: 54px 0 76px;
  border-top: 1px solid rgba(255, 255, 255, 0.18);
}

.winner-lines > div {
  display: grid;
  grid-template-columns: 50px 1fr;
  gap: 14px;
  padding: 25px 0;
  border-bottom: 1px solid rgba(255, 255, 255, 0.18);
}

.winner-index {
  color: var(--cyan);
  font-size: 0.72rem;
  font-weight: 900;
}

.winner-lines p {
  margin: 0;
  color: rgba(255, 255, 255, 0.67);
}

.winner-lines b {
  color: var(--white);
}

.role-split {
  display: grid;
  grid-template-columns: 1fr 80px 1fr;
  border: 1px solid rgba(255, 255, 255, 0.18);
}

.role-split > div:not(.role-divider) {
  min-height: 270px;
  padding: 34px;
}

.role-split > div > span {
  font-size: 0.68rem;
  font-weight: 900;
  letter-spacing: 0.14em;
}

.role-split h3 {
  margin: 22px 0 14px;
  font-size: clamp(1.4rem, 2.6vw, 2rem);
  letter-spacing: -0.04em;
  line-height: 1.35;
}

.role-split p {
  margin: 0;
  color: rgba(255, 255, 255, 0.55);
  font-size: 0.8rem;
}

.role-rlusd > span {
  color: var(--amber);
}

.role-xrp {
  background: rgba(43, 127, 255, 0.1);
}

.role-xrp > span {
  color: var(--cyan);
}

.role-divider {
  display: grid;
  border-right: 1px solid rgba(255, 255, 255, 0.18);
  border-left: 1px solid rgba(255, 255, 255, 0.18);
  place-items: center;
}

.role-divider span {
  color: rgba(255, 255, 255, 0.42);
  font-size: 1.7rem;
  font-weight: 300;
}

.role-note {
  margin: 0;
  padding: 22px 26px;
  color: rgba(255, 255, 255, 0.64);
  background: rgba(255, 255, 255, 0.05);
  font-size: 0.82rem;
}

.role-note b {
  color: var(--white);
}

.switch-board {
  display: grid;
  grid-template-columns: minmax(0, 1.3fr) minmax(260px, 0.7fr);
  min-height: 460px;
  border: 1px solid var(--line);
}

.switch-list {
  display: grid;
}

.factor-switch {
  display: grid;
  grid-template-columns: 52px 1fr;
  gap: 18px;
  width: 100%;
  padding: 22px 25px;
  border: 0;
  border-bottom: 1px solid var(--line);
  background: rgba(255, 255, 255, 0.38);
  align-items: center;
  text-align: left;
  cursor: pointer;
}

.factor-switch:last-child {
  border-bottom: 0;
}

.factor-switch:hover {
  background: rgba(255, 255, 255, 0.7);
}

.switch-control {
  position: relative;
  display: block;
  width: 44px;
  height: 24px;
  border: 1px solid var(--line);
  border-radius: 999px;
  background: #ccd2d5;
  transition: background 180ms ease;
}

.switch-control::after {
  position: absolute;
  top: 3px;
  left: 3px;
  width: 16px;
  height: 16px;
  border-radius: 50%;
  background: var(--white);
  box-shadow: 0 1px 3px rgba(7, 19, 31, 0.24);
  content: "";
  transition: transform 180ms ease;
}

.factor-switch.is-on .switch-control {
  background: var(--blue);
}

.factor-switch.is-on .switch-control::after {
  transform: translateX(20px);
}

.factor-switch > span:last-child {
  display: grid;
}

.factor-switch b {
  font-size: 0.88rem;
}

.factor-switch small {
  color: var(--muted);
  font-size: 0.68rem;
}

.verdict {
  display: grid;
  padding: 38px 30px;
  color: var(--white);
  background:
    radial-gradient(circle at 50% 26%, rgba(43, 127, 255, 0.27), transparent 28%),
    var(--ink);
  place-items: center;
  align-content: center;
  text-align: center;
}

.verdict-ring {
  display: flex;
  width: 126px;
  height: 126px;
  margin-bottom: 24px;
  border: 1px solid rgba(105, 242, 208, 0.5);
  border-radius: 50%;
  box-shadow: inset 0 0 30px rgba(105, 242, 208, 0.08);
  align-items: baseline;
  justify-content: center;
  gap: 3px;
  padding-top: 27px;
}

.verdict-ring span {
  color: var(--cyan);
  font-size: 2.8rem;
  font-weight: 700;
  line-height: 1;
}

.verdict-ring small {
  color: rgba(255, 255, 255, 0.45);
  font-size: 0.7rem;
}

.verdict-status {
  margin: 0 0 5px;
  color: var(--cyan);
  font-size: 0.65rem;
  font-weight: 900;
  letter-spacing: 0.08em;
}

.verdict h3 {
  margin: 0;
  font-size: 1.25rem;
  line-height: 1.4;
}

.verdict > p:last-child {
  margin: 13px 0 0;
  color: rgba(255, 255, 255, 0.54);
  font-size: 0.73rem;
  line-height: 1.75;
}

.switch-note {
  margin: 0;
  padding: 13px 17px;
  color: var(--muted);
  background: rgba(7, 19, 31, 0.05);
  font-size: 0.62rem;
}

.measurement-list {
  margin-top: 70px;
}

.measurement-list h3 {
  margin: 0 0 20px;
  font-size: clamp(1.5rem, 2.7vw, 2.2rem);
  letter-spacing: -0.04em;
}

.measurement-list ol {
  margin: 0;
  padding: 0;
  border-top: 1px solid var(--line);
  list-style: none;
}

.measurement-list li {
  display: grid;
  grid-template-columns: 130px 1fr;
  gap: 24px;
  padding: 23px 0;
  border-bottom: 1px solid var(--line);
}

.measurement-list li > span {
  color: var(--blue);
  font-size: 0.62rem;
  font-weight: 900;
  letter-spacing: 0.1em;
}

.measurement-list p {
  margin: 0;
  font-size: 0.88rem;
}

.evidence-section {
  background:
    linear-gradient(90deg, transparent 50%, rgba(43, 127, 255, 0.035) 50%),
    var(--paper);
}

.evidence-ruler {
  margin-top: 50px;
}

.ruler-track {
  position: relative;
  display: grid;
  height: 12px;
  grid-template-columns: repeat(4, 1fr);
  background: linear-gradient(90deg, var(--cyan-dark), var(--blue) 50%, var(--amber) 75%, var(--rose));
}

.ruler-track span {
  border-right: 3px solid var(--paper);
}

.ruler-track span:last-child {
  border-right: 0;
}

.evidence-columns {
  display: grid;
  grid-template-columns: repeat(2, 1fr);
  border-right: 1px solid var(--line);
  border-bottom: 1px solid var(--line);
}

.evidence-columns section {
  min-height: 295px;
  padding: 28px;
  border-top: 0;
  border-left: 1px solid var(--line);
}

.evidence-columns section:nth-child(-n+2) {
  border-bottom: 1px solid var(--line);
}

.evidence-columns section > span {
  font-size: 0.62rem;
  font-weight: 900;
  letter-spacing: 0.08em;
}

.evidence-fact > span {
  color: var(--cyan-dark);
}

.evidence-infer > span {
  color: var(--blue);
}

.evidence-thesis > span {
  color: #a46e00;
}

.evidence-unknown > span {
  color: #aa434d;
}

.evidence-columns h3 {
  margin: 8px 0 16px;
  font-size: 1.17rem;
  letter-spacing: -0.03em;
}

.evidence-columns ul {
  margin: 0;
  padding-left: 1.1em;
  color: #455665;
  font-size: 0.75rem;
  line-height: 1.85;
}

.evidence-columns p {
  margin: 0;
  color: #455665;
  font-size: 0.78rem;
}

.evidence-thesis {
  background: rgba(242, 184, 75, 0.08);
}

.evidence-unknown {
  background: rgba(227, 111, 121, 0.07);
}

.current-proof {
  display: grid;
  grid-template-columns: 130px 1fr;
  gap: 24px;
  margin-top: 36px;
  padding: 25px 0;
  border-top: 1px solid var(--line);
  border-bottom: 1px solid var(--line);
  align-items: start;
}

.current-proof p {
  margin: 0;
  font-size: 0.9rem;
}

.final-section {
  padding: clamp(100px, 14vw, 180px) 0;
  color: var(--white);
  background:
    radial-gradient(circle at 80% 18%, rgba(43, 127, 255, 0.3), transparent 25%),
    radial-gradient(circle at 18% 78%, rgba(105, 242, 208, 0.12), transparent 25%),
    var(--ink);
}

.final-shell {
  max-width: 1010px;
}

.final-shell > h2 {
  font-size: clamp(3rem, 7.4vw, 7rem);
  line-height: 1.03;
}

.final-answer {
  max-width: 950px;
  margin: 45px 0 0;
  color: rgba(255, 255, 255, 0.72);
  font-family: var(--serif);
  font-size: clamp(1.2rem, 2.3vw, 1.75rem);
  line-height: 2;
}

.final-answer strong {
  color: var(--white);
  font-family: var(--display);
}

.final-caveat {
  max-width: 820px;
  margin: 26px 0 0;
  padding-left: 22px;
  border-left: 2px solid var(--amber);
  color: rgba(255, 255, 255, 0.54);
  font-size: 0.83rem;
}

.final-binary {
  display: grid;
  grid-template-columns: repeat(2, 1fr);
  margin-top: 54px;
  border: 1px solid rgba(255, 255, 255, 0.2);
}

.final-binary > div {
  display: grid;
  min-height: 140px;
  padding: 28px;
  align-content: center;
}

.final-binary > div + div {
  border-left: 1px solid rgba(255, 255, 255, 0.2);
}

.final-binary span {
  color: var(--cyan);
  font-size: 0.65rem;
  font-weight: 900;
}

.final-binary > div:last-child span {
  color: var(--rose);
}

.final-binary b {
  margin-top: 7px;
  font-size: 1.1rem;
}

.last-line {
  margin: 80px 0 0;
  padding-top: 35px;
  border-top: 1px solid rgba(255, 255, 255, 0.18);
  color: rgba(255, 255, 255, 0.65);
  font-size: clamp(1.15rem, 2.2vw, 1.55rem);
  text-align: center;
}

.last-line strong {
  color: var(--cyan);
}

.sources-section {
  padding: 100px 0;
  background: #e9e5dd;
}

.sources-shell {
  display: grid;
  grid-template-columns: 0.8fr 1.2fr;
  gap: 80px;
}

.sources-heading {
  position: sticky;
  top: 40px;
  height: fit-content;
}

.sources-heading > span {
  color: var(--blue);
  font-size: 0.62rem;
  font-weight: 900;
  letter-spacing: 0.13em;
}

.sources-heading h2 {
  margin-top: 12px;
  font-size: clamp(2rem, 3.6vw, 3.4rem);
}

.sources-heading p {
  color: #536373;
  font-size: 0.8rem;
}

.source-list {
  margin: 0;
  padding: 0;
  border-top: 1px solid var(--line);
  counter-reset: source;
  list-style: none;
}

.source-list li {
  counter-increment: source;
  border-bottom: 1px solid var(--line);
}

.source-list a {
  position: relative;
  display: grid;
  padding: 18px 16px 18px 55px;
  text-decoration: none;
  transition: background 150ms ease;
}

.source-list a::before {
  position: absolute;
  top: 20px;
  left: 10px;
  color: var(--blue);
  content: counter(source, decimal-leading-zero);
  font-size: 0.64rem;
  font-weight: 900;
}

.source-list a:hover {
  background: rgba(255, 255, 255, 0.45);
}

.source-list b {
  font-size: 0.77rem;
}

.source-list span {
  color: var(--muted);
  font-size: 0.66rem;
  line-height: 1.6;
}

.method-note {
  grid-column: 2;
  margin: -44px 0 0;
  padding: 19px;
  color: var(--muted);
  background: rgba(255, 255, 255, 0.48);
  font-size: 0.65rem;
}

.related-section {
  padding: 100px 0;
  background: var(--paper);
}

.related-shell > h2,
.faq-shell > h2 {
  margin-bottom: 38px;
  font-size: clamp(2.2rem, 4vw, 3.6rem);
}

.related-links {
  display: grid;
  grid-template-columns: repeat(3, 1fr);
  border-top: 1px solid var(--ink);
  border-bottom: 1px solid var(--ink);
}

.related-links a {
  display: grid;
  min-height: 235px;
  padding: 28px;
  border-right: 1px solid var(--line);
  align-content: space-between;
  text-decoration: none;
  transition: color 180ms ease, background 180ms ease;
}

.related-links a:last-child {
  border-right: 0;
}

.related-links a:hover {
  color: var(--white);
  background: var(--ink);
}

.related-links span {
  color: var(--blue);
  font-size: 0.58rem;
  font-weight: 900;
  letter-spacing: 0.12em;
}

.related-links a:hover span {
  color: var(--cyan);
}

.related-links b {
  align-self: center;
  font-size: 1rem;
  line-height: 1.6;
}

.related-links small {
  color: var(--muted);
  font-size: 0.66rem;
}

.related-links a:hover small {
  color: rgba(255, 255, 255, 0.54);
}

.thesis-link {
  display: inline-block;
  margin-top: 24px;
  color: var(--blue);
  font-size: 0.76rem;
  font-weight: 800;
}

.faq-section {
  padding: 20px 0 120px;
  background: var(--paper);
}

.faq-shell {
  max-width: 920px;
}

.faq-shell details {
  border-top: 1px solid var(--line);
}

.faq-shell details:last-child {
  border-bottom: 1px solid var(--line);
}

.faq-shell summary {
  position: relative;
  padding: 24px 52px 24px 0;
  cursor: pointer;
  font-weight: 800;
  list-style: none;
}

.faq-shell summary::-webkit-details-marker {
  display: none;
}

.faq-shell summary::after {
  position: absolute;
  top: 22px;
  right: 6px;
  color: var(--blue);
  content: "＋";
  font-size: 1.2rem;
}

.faq-shell details[open] summary::after {
  content: "−";
}

.faq-shell details p {
  max-width: 740px;
  margin: -4px 0 25px;
  color: var(--muted);
  font-size: 0.86rem;
}

.site-footer {
  display: flex;
  padding: 55px max(24px, calc((100% - var(--max)) / 2));
  color: var(--white);
  background: #040b12;
  align-items: flex-end;
  justify-content: space-between;
}

.footer-brand {
  margin-bottom: 18px;
}

.site-footer p {
  margin: 0;
  color: rgba(255, 255, 255, 0.38);
  font-size: 0.7rem;
}

.site-footer > div:last-child {
  display: grid;
  color: rgba(255, 255, 255, 0.4);
  font-size: 0.65rem;
  text-align: right;
}

.site-footer a {
  color: var(--cyan);
}

@media (max-width: 960px) {
  .hero {
    min-height: auto;
  }

  .answer-grid {
    grid-template-columns: repeat(2, 1fr);
  }

  .answer-grid > div:nth-child(2) {
    border-right: 0;
  }

  .answer-grid > div:nth-child(-n+2) {
    border-bottom: 1px solid rgba(255, 255, 255, 0.12);
  }

  .answer-grid > div:nth-child(3) {
    padding-left: 0;
  }

  .section-heading {
    grid-template-columns: 1fr;
    gap: 24px;
  }

  .boundary-stage {
    grid-template-columns: 1fr 0.62fr 1fr;
  }

  .institution {
    padding: 70px 24px 40px;
  }

  .mode-result {
    grid-template-columns: 130px 1fr;
  }

  .result-copy {
    grid-column: 1 / -1;
  }

  .article-grid {
    grid-template-columns: 100px minmax(0, 1fr);
    gap: 35px;
  }

  .rail-map {
    grid-template-columns: 1fr 120px 1fr;
  }

  .role-split {
    grid-template-columns: 1fr 60px 1fr;
  }

  .sources-shell {
    gap: 45px;
  }
}

@media (max-width: 720px) {
  body {
    font-size: 15px;
  }

  .site-header {
    width: min(calc(100% - 30px), var(--max));
    padding-top: 18px;
  }

  .site-header nav a:not(.nav-all) {
    display: none;
  }

  .hero-inner,
  .section-shell,
  .final-shell,
  .sources-shell,
  .related-shell,
  .faq-shell {
    width: min(calc(100% - 32px), var(--max));
  }

  .hero-inner {
    padding-top: 112px;
  }

  .hero h1 {
    font-size: clamp(2.35rem, 12vw, 3.7rem);
    letter-spacing: -0.055em;
  }

  .hero h1 br {
    display: none;
  }

  .hero-deck {
    margin-top: 22px;
  }

  .answer-lead {
    grid-template-columns: 1fr;
    gap: 12px;
  }

  .answer-grid {
    grid-template-columns: 1fr;
  }

  .answer-grid > div,
  .answer-grid > div:first-child,
  .answer-grid > div:nth-child(3),
  .answer-grid > div:last-child {
    padding: 15px 0;
    border-right: 0;
    border-bottom: 1px solid rgba(255, 255, 255, 0.12);
  }

  .answer-grid > div:last-child {
    border-bottom: 0;
  }

  .main-figure,
  .content-section {
    padding: 84px 0;
  }

  .section-heading > div {
    display: block;
  }

  .section-no {
    display: block;
    margin: 0 0 10px;
  }

  .section-heading h2,
  .prose > h2 {
    font-size: clamp(2.15rem, 10.5vw, 3.25rem);
  }

  .mode-tabs {
    grid-template-columns: 1fr;
  }

  .mode-tabs button {
    min-height: 54px;
    border-right: 0;
    border-bottom: 1px solid rgba(255, 255, 255, 0.14);
    justify-content: flex-start;
  }

  .mode-tabs button:last-child {
    border-bottom: 0;
  }

  .boundary-stage {
    grid-template-columns: 1fr;
  }

  .institution {
    min-height: 215px;
    padding: 58px 25px 26px;
  }

  .institution-a {
    border-right: 0;
    border-bottom: 1px solid rgba(255, 255, 255, 0.1);
  }

  .institution-b {
    border-top: 1px solid rgba(255, 255, 255, 0.1);
    border-left: 0;
  }

  .boundary-gate {
    min-height: 220px;
  }

  .gate-line {
    top: 50%;
  }

  .mode-result {
    grid-template-columns: 1fr;
    gap: 14px;
    padding: 24px;
  }

  .result-copy {
    grid-column: auto;
  }

  .figure-conclusion {
    grid-template-columns: 1fr;
    gap: 10px;
    padding: 24px;
  }

  .figure-caption {
    text-align: left;
  }

  .article-grid {
    width: min(calc(100% - 32px), 1080px);
    grid-template-columns: 1fr;
    gap: 0;
  }

  .margin-label {
    position: static;
    display: flex;
    margin-bottom: 18px;
    align-items: baseline;
    gap: 12px;
  }

  .margin-label p {
    margin: 0;
  }

  .prose .lede {
    padding-left: 16px;
  }

  .explain-flow > div,
  .explain-flow.compact > div {
    grid-template-columns: 1fr;
    gap: 7px;
    padding: 21px 0;
  }

  .rail-map {
    grid-template-columns: 1fr;
  }

  .choice-gate {
    min-height: 120px;
    border: 0;
    border-top: 1px solid var(--line);
    border-bottom: 1px solid var(--line);
  }

  figure > figcaption {
    display: grid;
    gap: 4px;
  }

  .reason-block {
    grid-template-columns: 1fr;
    gap: 17px;
  }

  .cost-equation {
    grid-template-columns: 1fr;
  }

  .equation-left {
    min-height: 105px;
  }

  .operator {
    min-height: 45px;
  }

  .role-split {
    grid-template-columns: 1fr;
  }

  .role-divider {
    min-height: 70px;
    border: 0;
    border-top: 1px solid rgba(255, 255, 255, 0.18);
    border-bottom: 1px solid rgba(255, 255, 255, 0.18);
  }

  .switch-board {
    grid-template-columns: 1fr;
  }

  .factor-switch {
    grid-template-columns: 48px 1fr;
    padding: 20px 18px;
  }

  .verdict {
    min-height: 400px;
  }

  .measurement-list li {
    grid-template-columns: 1fr;
    gap: 7px;
  }

  .evidence-columns {
    grid-template-columns: 1fr;
  }

  .evidence-columns section {
    min-height: auto;
    border-bottom: 1px solid var(--line);
  }

  .evidence-columns section:last-child {
    border-bottom: 0;
  }

  .current-proof {
    grid-template-columns: 1fr;
    gap: 14px;
  }

  .final-binary {
    grid-template-columns: 1fr;
  }

  .final-binary > div + div {
    border-top: 1px solid rgba(255, 255, 255, 0.2);
    border-left: 0;
  }

  .sources-shell {
    display: block;
  }

  .sources-heading {
    position: static;
    margin-bottom: 38px;
  }

  .method-note {
    margin: 28px 0 0;
  }

  .related-links {
    grid-template-columns: 1fr;
  }

  .related-links a {
    min-height: 190px;
    border-right: 0;
    border-bottom: 1px solid var(--line);
  }

  .related-links a:last-child {
    border-bottom: 0;
  }

  .site-footer {
    display: grid;
    gap: 38px;
    padding: 48px 20px;
  }

  .site-footer > div:last-child {
    text-align: left;
  }
}

@media (prefers-reduced-motion: reduce) {
  html {
    scroll-behavior: auto;
  }

  *,
  *::before,
  *::after {
    animation-duration: 0.01ms !important;
    animation-iteration-count: 1 !important;
    transition-duration: 0.01ms !important;
  }
}

@media print {
  .site-header,
  .reading-progress,
  .mode-tabs,
  .switch-list,
  .site-footer {
    display: none;
  }

  .hero {
    min-height: auto;
    color: var(--ink);
    background: var(--white);
  }

  .hero h1 em,
  .eyebrow,
  .answer-grid dt {
    color: var(--ink);
  }

  .first-answer,
  .answer-grid,
  .answer-grid > div {
    border-color: var(--line);
  }

  .answer-lead p,
  .answer-grid dd,
  .hero-meta {
    color: #333;
  }

  .section-dark,
  .dark-ink,
  .final-section {
    color: var(--ink);
    background: var(--white);
  }

  .content-section,
  .main-figure,
  .final-section,
  .sources-section {
    padding: 42px 0;
    break-inside: avoid;
  }
}