@import url('https://fonts.googleapis.com/css2?family=IBM+Plex+Mono:wght@400;500;600;700&family=Inter:wght@400;500;600;700;800;900&display=swap');

:root {
  /* Fifth Signal brand green sampled from the source logo artwork. */
  --ink: #070a07;
  --ink-soft: #101510;
  --ink-raised: #151c15;
  --paper: #f2f1e9;
  --paper-bright: #fbfbf7;
  --white: #ffffff;
  --green: #40ff77;
  --green-dark: #087236;
  --green-deep: #075d2d;
  --green-wash: rgba(64, 255, 119, 0.12);
  --gray-50: #f7f7f2;
  --gray-100: #ecece4;
  --gray-200: #d9ddd3;
  --gray-300: #bec5b9;
  --gray-500: #6d776c;
  --gray-700: #394238;
  --line-dark: rgba(255, 255, 255, 0.12);
  --line-light: rgba(7, 10, 7, 0.13);
  --shadow-lg: 0 32px 90px rgba(5, 10, 5, 0.16);
  --shadow-sm: 0 16px 42px rgba(5, 10, 5, 0.08);
  --sans: "Inter", system-ui, -apple-system, BlinkMacSystemFont, "Segoe UI", sans-serif;
  --mono: "IBM Plex Mono", ui-monospace, SFMono-Regular, Consolas, monospace;
  --container: 1240px;
  --nav-height: 76px;
}

* {
  box-sizing: border-box;
}

html {
  scroll-behavior: smooth;
  scroll-padding-top: calc(var(--nav-height) + 22px);
}

body {
  margin: 0;
  color: var(--ink);
  background: var(--paper-bright);
  font-family: var(--sans);
  font-size: 16px;
  line-height: 1.55;
  -webkit-font-smoothing: antialiased;
  overflow-x: hidden;
}

body.menu-open {
  overflow: hidden;
}

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

a {
  color: inherit;
  text-decoration: none;
}

button,
input,
select,
textarea {
  font: inherit;
}

button {
  color: inherit;
}

h1,
h2,
h3,
h4,
p,
ul {
  margin-top: 0;
}

.skip-link {
  position: fixed;
  z-index: 200;
  top: 12px;
  left: 12px;
  transform: translateY(-160%);
  padding: 10px 14px;
  background: var(--green);
  color: var(--ink);
  font-family: var(--mono);
  font-size: 12px;
  font-weight: 700;
}

.skip-link:focus {
  transform: translateY(0);
}

.container {
  width: min(var(--container), calc(100% - 64px));
  margin-inline: auto;
}

.section {
  position: relative;
  padding: 96px 0;
}

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

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

.section--ruled {
  border-top: 1px solid var(--line-light);
  border-bottom: 1px solid var(--line-light);
}

.eyebrow {
  display: inline-flex;
  align-items: center;
  gap: 10px;
  margin-bottom: 18px;
  color: var(--green-deep);
  font-family: var(--mono);
  font-size: 11px;
  font-weight: 700;
  letter-spacing: 0.15em;
  text-transform: uppercase;
}

.section--dark .eyebrow {
  color: var(--green);
}

.eyebrow::before {
  width: 22px;
  height: 1px;
  background: currentColor;
  content: "";
}

.display {
  max-width: 930px;
  margin-bottom: 20px;
  font-size: clamp(44px, 6.4vw, 90px);
  font-weight: 850;
  letter-spacing: -0.052em;
  line-height: 0.99;
  text-wrap: balance;
}

.section-title {
  max-width: 870px;
  margin-bottom: 18px;
  font-size: clamp(38px, 4.7vw, 68px);
  font-weight: 820;
  letter-spacing: -0.045em;
  line-height: 1.04;
  text-wrap: balance;
}

.section-lede {
  max-width: 730px;
  margin-bottom: 0;
  color: var(--gray-500);
  font-size: clamp(18px, 1.7vw, 24px);
  font-weight: 520;
  letter-spacing: -0.025em;
  line-height: 1.42;
}

.section--dark .section-lede {
  color: rgba(255, 255, 255, 0.62);
}

.button {
  display: inline-flex;
  min-height: 52px;
  align-items: center;
  justify-content: center;
  gap: 10px;
  padding: 0 21px;
  border: 1px solid var(--ink);
  background: var(--ink);
  color: var(--white);
  cursor: pointer;
  font-family: var(--mono);
  font-size: 11px;
  font-weight: 700;
  letter-spacing: 0.075em;
  line-height: 1;
  text-align: center;
  text-transform: uppercase;
  transition: transform 180ms ease, background-color 180ms ease, border-color 180ms ease, color 180ms ease;
}

.button:hover {
  transform: translateY(-2px);
  background: var(--green-deep);
  border-color: var(--green-deep);
}

.button:focus-visible,
.text-link:focus-visible,
.nav-link:focus-visible,
.domain-tab:focus-visible,
.method-step:focus-visible,
.menu-toggle:focus-visible {
  outline: 3px solid var(--green);
  outline-offset: 3px;
}

.button--green {
  background: var(--green);
  color: var(--ink);
  border-color: var(--green);
}

.button--green:hover {
  background: #33ffb2;
  color: var(--ink);
  border-color: #33ffb2;
}

.button--light {
  background: var(--white);
  color: var(--ink);
  border-color: var(--white);
}

.button--ghost {
  background: transparent;
  color: var(--ink);
  border-color: var(--line-light);
}

.section--dark .button--ghost,
.hero .button--ghost {
  color: var(--white);
  border-color: rgba(255, 255, 255, 0.24);
}

.button--ghost:hover {
  background: var(--green-wash);
  color: inherit;
  border-color: var(--green);
}

.text-link {
  display: inline-flex;
  align-items: center;
  gap: 8px;
  font-family: var(--mono);
  font-size: 12px;
  font-weight: 700;
  letter-spacing: 0.035em;
  text-decoration: underline;
  text-decoration-color: rgba(11, 142, 55, 0.45);
  text-underline-offset: 5px;
}

.text-link::after {
  content: "→";
}

.text-link:hover {
  color: var(--green-deep);
}

.meta-label {
  color: var(--gray-500);
  font-family: var(--mono);
  font-size: 10px;
  font-weight: 600;
  letter-spacing: 0.12em;
  text-transform: uppercase;
}

.site-header {
  position: sticky;
  z-index: 100;
  top: 0;
  height: var(--nav-height);
  background: rgba(7, 10, 7, 0.94);
  color: var(--white);
  border-bottom: 1px solid var(--line-dark);
  backdrop-filter: blur(18px);
}

.nav-shell {
  height: 100%;
  display: flex;
  align-items: center;
  gap: 30px;
}

.brand {
  display: inline-flex;
  min-width: max-content;
  align-items: center;
  gap: 12px;
}

.brand img {
  width: 38px;
  height: 38px;
  border: 1px solid rgba(255, 255, 255, 0.18);
  object-fit: cover;
}

.brand-copy {
  display: grid;
  gap: 2px;
}

.brand-name {
  font-family: var(--mono);
  font-size: 12px;
  font-weight: 700;
  letter-spacing: 0.14em;
  text-transform: uppercase;
}

.brand-tag {
  color: rgba(255, 255, 255, 0.66);
  font-family: var(--mono);
  font-size: 9px;
  letter-spacing: 0.1em;
  text-transform: uppercase;
}

.nav-links {
  display: flex;
  align-items: center;
  gap: 25px;
  margin-left: auto;
}

.nav-link {
  position: relative;
  color: rgba(255, 255, 255, 0.67);
  font-family: var(--mono);
  font-size: 10px;
  font-weight: 600;
  letter-spacing: 0.08em;
  text-transform: uppercase;
}

.nav-link::after {
  position: absolute;
  right: 0;
  bottom: -9px;
  left: 0;
  height: 1px;
  transform: scaleX(0);
  transform-origin: left;
  background: var(--green);
  content: "";
  transition: transform 160ms ease;
}

.nav-link:hover {
  color: var(--white);
}

.nav-link:hover::after {
  transform: scaleX(1);
}

.nav-cta {
  min-height: 42px;
  padding-inline: 16px;
  margin-left: 4px;
}

/* The in-menu CTA is the mobile version; the sibling CTA is the desktop version. */
.nav-links .nav-cta {
  display: none;
}

.menu-toggle {
  display: none;
  width: 44px;
  height: 44px;
  align-items: center;
  justify-content: center;
  margin-left: auto;
  border: 1px solid var(--line-dark);
  background: transparent;
  color: var(--white);
  cursor: pointer;
}

.menu-toggle-lines,
.menu-toggle-lines::before,
.menu-toggle-lines::after {
  width: 18px;
  height: 1px;
  display: block;
  background: currentColor;
  content: "";
  transition: transform 160ms ease, opacity 160ms ease;
}

.menu-toggle-lines {
  position: relative;
}

.menu-toggle-lines::before {
  position: absolute;
  top: -6px;
}

.menu-toggle-lines::after {
  position: absolute;
  top: 6px;
}

.menu-open .menu-toggle-lines {
  background: transparent;
}

.menu-open .menu-toggle-lines::before {
  top: 0;
  transform: rotate(45deg);
}

.menu-open .menu-toggle-lines::after {
  top: 0;
  transform: rotate(-45deg);
}

.hero {
  position: relative;
  min-height: calc(100vh - var(--nav-height));
  overflow: hidden;
  padding: 92px 0 88px;
  background:
    radial-gradient(circle at 75% 24%, rgba(0, 255, 159, 0.11), transparent 28%),
    var(--ink);
  color: var(--white);
}

.hero::before {
  position: absolute;
  inset: 0;
  background-image:
    linear-gradient(rgba(255, 255, 255, 0.045) 1px, transparent 1px),
    linear-gradient(90deg, rgba(255, 255, 255, 0.045) 1px, transparent 1px);
  background-size: 76px 76px;
  content: "";
  mask-image: linear-gradient(to bottom, #000 0%, rgba(0, 0, 0, 0.65) 70%, transparent 100%);
  pointer-events: none;
}

.hero::after {
  position: absolute;
  width: 580px;
  height: 580px;
  right: -260px;
  bottom: -320px;
  border: 1px solid rgba(0, 255, 159, 0.17);
  border-radius: 50%;
  box-shadow:
    0 0 0 90px rgba(0, 255, 159, 0.025),
    0 0 0 180px rgba(0, 255, 159, 0.018);
  content: "";
}

.hero-grid {
  position: relative;
  z-index: 2;
  display: grid;
  grid-template-columns: minmax(0, 1fr) minmax(390px, 0.67fr);
  gap: 74px;
  align-items: center;
}

.hero-copy {
  max-width: 760px;
}

.hero .eyebrow {
  color: var(--green);
}

.hero-lede {
  max-width: 720px;
  margin-bottom: 30px;
  color: rgba(255, 255, 255, 0.7);
  font-size: clamp(19px, 1.8vw, 26px);
  font-weight: 500;
  letter-spacing: -0.027em;
  line-height: 1.42;
}

.hero-actions {
  display: flex;
  flex-wrap: wrap;
  gap: 11px;
  margin-bottom: 24px;
}

.hero-trader {
  color: rgba(255, 255, 255, 0.67);
}

.hero-trader:hover {
  color: var(--green);
}

.research-console {
  position: relative;
  padding: 1px;
  background: linear-gradient(145deg, rgba(0, 255, 159, 0.68), rgba(255, 255, 255, 0.08) 32%, rgba(255, 255, 255, 0.18));
  box-shadow: 0 30px 100px rgba(0, 0, 0, 0.42);
}

.console-inner {
  min-height: 580px;
  padding: 22px;
  background: #0a0e0a;
}

.console-header {
  display: flex;
  align-items: center;
  justify-content: space-between;
  gap: 18px;
  padding-bottom: 16px;
  border-bottom: 1px solid var(--line-dark);
  font-family: var(--mono);
  font-size: 9px;
  letter-spacing: 0.11em;
  text-transform: uppercase;
}

.console-header span:first-child {
  color: rgba(255, 255, 255, 0.72);
}

.system-status {
  display: inline-flex;
  align-items: center;
  gap: 7px;
  color: var(--green);
}

.system-status::before {
  width: 7px;
  height: 7px;
  border-radius: 50%;
  background: currentColor;
  box-shadow: 0 0 0 4px rgba(0, 255, 159, 0.08);
  content: "";
}

.console-caption {
  display: flex;
  align-items: end;
  justify-content: space-between;
  gap: 16px;
  padding: 24px 0 17px;
}

.console-caption h2 {
  max-width: 310px;
  margin: 0;
  font-size: 24px;
  font-weight: 740;
  letter-spacing: -0.035em;
  line-height: 1.12;
}

.console-caption .meta-label {
  color: rgba(255, 255, 255, 0.38);
  text-align: right;
}

.signal-architecture {
  position: relative;
  min-height: 298px;
  padding: 24px 18px;
  overflow: hidden;
  border: 1px solid var(--line-dark);
  background:
    linear-gradient(rgba(255, 255, 255, 0.035) 1px, transparent 1px),
    linear-gradient(90deg, rgba(255, 255, 255, 0.035) 1px, transparent 1px);
  background-size: 34px 34px;
}

.signal-architecture::after {
  position: absolute;
  right: 0;
  left: 0;
  top: 0;
  height: 1px;
  background: linear-gradient(90deg, transparent, var(--green), transparent);
  content: "";
  animation: console-scan 4.8s linear infinite;
  box-shadow: 0 0 22px rgba(0, 255, 159, 0.42);
}

@keyframes console-scan {
  from { transform: translateY(0); }
  to { transform: translateY(298px); }
}

.architecture-grid {
  position: relative;
  z-index: 2;
  height: 248px;
  display: grid;
  grid-template-columns: 1fr 112px 1fr;
  grid-template-rows: repeat(3, 1fr);
  gap: 8px 14px;
  align-items: center;
}

.architecture-grid::before,
.architecture-grid::after {
  position: absolute;
  top: 50%;
  width: 29%;
  height: 1px;
  background: rgba(0, 255, 159, 0.32);
  content: "";
}

.architecture-grid::before {
  left: 20%;
}

.architecture-grid::after {
  right: 20%;
}

.source-node,
.output-node {
  position: relative;
  min-width: 0;
  padding: 10px 11px;
  border: 1px solid var(--line-dark);
  background: rgba(255, 255, 255, 0.035);
  color: rgba(255, 255, 255, 0.68);
  font-family: var(--mono);
  font-size: 9px;
  font-weight: 600;
  letter-spacing: 0.055em;
  line-height: 1.35;
  overflow-wrap: anywhere;
  text-transform: uppercase;
}

.source-node:nth-of-type(1) { grid-column: 1; grid-row: 1; }
.source-node:nth-of-type(2) { grid-column: 1; grid-row: 2; }
.source-node:nth-of-type(3) { grid-column: 1; grid-row: 3; }

.output-node:nth-of-type(5) { grid-column: 3; grid-row: 1; }
.output-node:nth-of-type(6) { grid-column: 3; grid-row: 2; }
.output-node:nth-of-type(7) { grid-column: 3; grid-row: 3; }

.signal-core {
  position: relative;
  z-index: 3;
  width: 112px;
  height: 112px;
  grid-column: 2;
  grid-row: 1 / 4;
  display: grid;
  place-items: center;
  border: 1px solid rgba(0, 255, 159, 0.55);
  border-radius: 50%;
  background: #0d160d;
  box-shadow:
    0 0 0 10px rgba(0, 255, 159, 0.04),
    inset 0 0 36px rgba(0, 255, 159, 0.07);
  color: var(--green);
  font-family: var(--mono);
  font-size: 10px;
  font-weight: 700;
  letter-spacing: 0.11em;
  text-align: center;
  text-transform: uppercase;
}

.source-node::after,
.output-node::before {
  position: absolute;
  top: 50%;
  width: 14px;
  height: 1px;
  background: rgba(0, 255, 159, 0.28);
  content: "";
}

.source-node::after {
  right: -15px;
}

.output-node::before {
  left: -15px;
}

.console-foot {
  display: grid;
  grid-template-columns: repeat(3, 1fr);
  gap: 8px;
  margin-top: 10px;
}

.console-foot span {
  padding: 10px 8px;
  border: 1px solid var(--line-dark);
  color: rgba(255, 255, 255, 0.43);
  font-family: var(--mono);
  font-size: 8px;
  letter-spacing: 0.06em;
  text-align: center;
  text-transform: uppercase;
}

.proof-strip {
  color: var(--white);
  background: var(--ink-soft);
  border-top: 1px solid var(--line-dark);
  border-bottom: 1px solid var(--line-dark);
}

.proof-grid {
  display: grid;
  grid-template-columns: repeat(4, 1fr);
}

.proof-item {
  min-height: 112px;
  padding: 25px 25px 22px;
  border-right: 1px solid var(--line-dark);
}

.proof-item:first-child {
  border-left: 1px solid var(--line-dark);
}

.proof-item strong {
  display: block;
  margin-bottom: 8px;
  font-size: 17px;
  letter-spacing: -0.02em;
}

.proof-item span {
  color: rgba(255, 255, 255, 0.46);
  font-family: var(--mono);
  font-size: 9px;
  letter-spacing: 0.07em;
  line-height: 1.5;
  text-transform: uppercase;
}

.ladder-strip {
  border-bottom: 1px solid var(--line-light);
  background: var(--paper-bright);
}

.ladder-grid {
  display: grid;
  grid-template-columns: repeat(4, 1fr);
}

.ladder-grid a {
  min-height: 124px;
  display: flex;
  flex-direction: column;
  justify-content: center;
  padding: 22px 24px;
  border-right: 1px solid var(--line-light);
  color: var(--ink);
}

.ladder-grid a:first-child {
  border-left: 1px solid var(--line-light);
}

.ladder-grid a:hover,
.ladder-grid a:focus-visible {
  background: var(--green-wash);
}

.ladder-grid span,
.ladder-grid small {
  color: var(--gray-500);
  font-family: var(--mono);
  font-size: 8px;
  letter-spacing: 0.07em;
  line-height: 1.45;
  text-transform: uppercase;
}

.ladder-grid strong {
  margin: 7px 0 6px;
  font-size: 18px;
  letter-spacing: -0.025em;
}

.section-head {
  display: grid;
  grid-template-columns: minmax(0, 1fr) minmax(260px, 0.45fr);
  gap: 60px;
  align-items: end;
  margin-bottom: 54px;
}

.section-head .section-lede {
  justify-self: end;
}

.domain-layout {
  display: grid;
  grid-template-columns: 0.74fr 1.26fr;
  gap: 22px;
  align-items: stretch;
}

.domain-tabs {
  display: grid;
  border-top: 1px solid var(--line-light);
}

.domain-tab {
  width: 100%;
  display: grid;
  grid-template-columns: 38px 1fr auto;
  gap: 13px;
  align-items: center;
  padding: 20px 14px;
  border: 0;
  border-bottom: 1px solid var(--line-light);
  background: transparent;
  cursor: pointer;
  text-align: left;
}

.domain-tab-number {
  color: var(--gray-500);
  font-family: var(--mono);
  font-size: 10px;
}

.domain-tab strong {
  font-size: 19px;
  letter-spacing: -0.025em;
}

.domain-tab-arrow {
  color: var(--gray-300);
  font-family: var(--mono);
}

.domain-tab[aria-selected="true"] strong,
.domain-tab[aria-selected="true"] .domain-tab-arrow {
  color: var(--green-deep);
}

.domain-tab[aria-selected="true"] {
  background: rgba(11, 142, 55, 0.055);
  box-shadow: inset 3px 0 0 var(--green-deep);
}

.domain-detail {
  position: relative;
  height: 520px;
  min-height: 0;
  display: grid;
  grid-template-rows: 1fr auto;
  padding: 40px;
  overflow: hidden;
  background: var(--ink);
  color: var(--white);
  box-shadow: var(--shadow-lg);
}

.domain-detail::before {
  position: absolute;
  inset: 0;
  background:
    radial-gradient(circle at 88% 8%, rgba(0, 255, 159, 0.15), transparent 29%),
    linear-gradient(rgba(255, 255, 255, 0.035) 1px, transparent 1px),
    linear-gradient(90deg, rgba(255, 255, 255, 0.035) 1px, transparent 1px);
  background-size: auto, 56px 56px, 56px 56px;
  content: "";
  pointer-events: none;
}

.domain-detail-copy,
.domain-detail-foot {
  position: relative;
  z-index: 2;
  transition: opacity 170ms ease, transform 170ms ease;
}

.domain-detail.is-switching .domain-detail-copy,
.domain-detail.is-switching .domain-detail-foot {
  opacity: 0;
  transform: translateY(7px);
}

.domain-detail-kicker {
  margin-bottom: 22px;
  color: var(--green);
  font-family: var(--mono);
  font-size: 10px;
  font-weight: 700;
  letter-spacing: 0.13em;
  text-transform: uppercase;
}

.domain-detail h3 {
  max-width: 610px;
  margin-bottom: 18px;
  font-size: clamp(34px, 4vw, 58px);
  font-weight: 790;
  letter-spacing: -0.052em;
  line-height: 1;
}

.domain-detail p {
  max-width: 640px;
  color: rgba(255, 255, 255, 0.63);
  font-size: 18px;
  line-height: 1.55;
}

.source-tags {
  display: flex;
  flex-wrap: wrap;
  gap: 8px;
  padding-top: 24px;
  border-top: 1px solid var(--line-dark);
}

.source-tag {
  padding: 9px 10px;
  border: 1px solid var(--line-dark);
  background: rgba(255, 255, 255, 0.035);
  color: rgba(255, 255, 255, 0.65);
  font-family: var(--mono);
  font-size: 9px;
  font-weight: 600;
  letter-spacing: 0.05em;
  text-transform: uppercase;
}

.method-grid {
  display: grid;
  grid-template-columns: minmax(0, 0.78fr) minmax(0, 1.22fr);
  gap: 54px;
  align-items: start;
}

.method-copy {
  position: sticky;
  top: 112px;
}

.method-note {
  max-width: 520px;
  margin-top: 24px;
  padding: 20px 21px;
  border-left: 2px solid var(--green-deep);
  background: rgba(11, 142, 55, 0.055);
  color: var(--gray-700);
  font-size: 15px;
}

.method-steps {
  counter-reset: method;
  border-top: 1px solid var(--line-light);
}

.method-step {
  width: 100%;
  display: grid;
  grid-template-columns: 58px minmax(150px, 0.42fr) 1fr;
  gap: 20px;
  align-items: start;
  padding: 26px 4px;
  border: 0;
  border-bottom: 1px solid var(--line-light);
  background: transparent;
  cursor: default;
  text-align: left;
}

.method-step-number {
  color: var(--green-deep);
  font-family: var(--mono);
  font-size: 11px;
  font-weight: 700;
}

.method-step-title {
  display: block;
  margin: 0;
  font-size: 21px;
  font-weight: 700;
  letter-spacing: -0.03em;
}

.method-step-copy {
  display: block;
  margin: 0;
  color: var(--gray-500);
  font-size: 15px;
  line-height: 1.55;
}

.research-grid {
  display: grid;
  grid-template-columns: repeat(3, minmax(0, 1fr));
  gap: 18px;
}

.research-card {
  min-width: 0;
  min-height: 0;
  display: flex;
  flex-direction: column;
  overflow: hidden;
  border: 1px solid var(--line-light);
  background: var(--paper-bright);
  color: var(--ink);
  transition: transform 180ms ease, box-shadow 180ms ease, border-color 180ms ease;
}

.research-card:hover {
  transform: translateY(-3px);
  border-color: rgba(11, 142, 55, 0.34);
  box-shadow: var(--shadow-sm);
}

.file-cover {
  position: relative;
  min-height: 245px;
  display: flex;
  flex-direction: column;
  justify-content: space-between;
  padding: 21px;
  overflow: hidden;
  background: var(--ink);
  color: var(--white);
}

.file-cover::before {
  position: absolute;
  inset: 0;
  background:
    linear-gradient(145deg, transparent 0 57%, rgba(0, 255, 159, 0.12) 57% 58%, transparent 58%),
    linear-gradient(rgba(255, 255, 255, 0.035) 1px, transparent 1px),
    linear-gradient(90deg, rgba(255, 255, 255, 0.035) 1px, transparent 1px);
  background-size: auto, 28px 28px, 28px 28px;
  content: "";
}

.file-cover::after {
  position: absolute;
  width: 130px;
  height: 130px;
  right: -42px;
  bottom: -48px;
  border: 1px solid rgba(0, 255, 159, 0.35);
  border-radius: 50%;
  box-shadow: 0 0 0 22px rgba(0, 255, 159, 0.03);
  content: "";
}

.file-code,
.file-cover-title {
  position: relative;
  z-index: 2;
}

.file-code {
  color: var(--green);
  font-family: var(--mono);
  font-size: 9px;
  font-weight: 700;
  letter-spacing: 0.12em;
  text-transform: uppercase;
}

.file-cover-title {
  max-width: 230px;
  margin: 0;
  font-size: 25px;
  font-weight: 760;
  letter-spacing: -0.045em;
  line-height: 1.03;
}

.research-card-body {
  flex: 1;
  display: flex;
  flex-direction: column;
  padding: 20px 21px 22px;
}

.file-cover-image {
  width: 100%;
  height: auto;
  aspect-ratio: 612 / 792;
  border-bottom: 1px solid var(--line-light);
  background: var(--ink);
  object-fit: cover;
}

.research-card-body h3 {
  margin-bottom: 10px;
  font-size: 22px;
  letter-spacing: -0.035em;
  line-height: 1.1;
}

.research-card-meta {
  display: flex;
  justify-content: space-between;
  gap: 14px;
  margin-bottom: 15px;
  color: var(--gray-500);
  font-family: var(--mono);
  font-size: 9px;
  letter-spacing: 0.055em;
  text-transform: uppercase;
}

.research-card-body p {
  margin-bottom: 0;
  color: var(--gray-700);
  font-size: 14px;
  line-height: 1.53;
}

.research-card-body .text-link {
  margin-top: auto;
}

.file-badge {
  width: fit-content;
  margin-top: 17px;
  padding: 6px 8px;
  border: 1px solid rgba(11, 142, 55, 0.25);
  background: rgba(11, 142, 55, 0.06);
  color: var(--green-deep);
  font-family: var(--mono);
  font-size: 8px;
  font-weight: 700;
  letter-spacing: 0.065em;
  text-transform: uppercase;
}

.section-head--compact {
  margin-bottom: 34px;
}

.evidence-standard-grid {
  display: grid;
  grid-template-columns: repeat(3, minmax(0, 1fr));
  gap: 12px;
}

.evidence-standard-card {
  padding: 25px;
  border: 1px solid var(--line-light);
  background: var(--paper-bright);
}

.evidence-standard-card span {
  display: block;
  margin-bottom: 32px;
  color: var(--green-deep);
  font-family: var(--mono);
  font-size: 10px;
  font-weight: 700;
}

.evidence-standard-card strong {
  display: block;
  margin-bottom: 9px;
  font-size: 20px;
  letter-spacing: -0.025em;
}

.evidence-standard-card p {
  margin: 0;
  color: var(--gray-500);
  font-size: 14px;
}

.institutional-panel {
  position: relative;
  display: grid;
  grid-template-columns: minmax(0, 0.86fr) minmax(0, 1.14fr);
  gap: 64px;
  padding: 58px;
  overflow: hidden;
  background: var(--paper);
  border: 1px solid var(--line-light);
  box-shadow: var(--shadow-sm);
}

.institutional-panel::after {
  position: absolute;
  width: 360px;
  height: 360px;
  left: -210px;
  bottom: -230px;
  border: 1px solid rgba(11, 142, 55, 0.18);
  border-radius: 50%;
  box-shadow:
    0 0 0 50px rgba(11, 142, 55, 0.025),
    0 0 0 100px rgba(11, 142, 55, 0.02);
  content: "";
}

.institutional-copy,
.services-list {
  position: relative;
  z-index: 2;
}

.institutional-copy .section-title {
  font-size: clamp(38px, 4.6vw, 64px);
}

.institutional-copy p {
  max-width: 560px;
  color: var(--gray-500);
  font-size: 18px;
}

.services-list {
  border-top: 1px solid var(--line-light);
}

.service-row {
  display: grid;
  grid-template-columns: 43px minmax(150px, 0.55fr) 1fr;
  gap: 18px;
  padding: 20px 4px;
  border-bottom: 1px solid var(--line-light);
}

.service-row span {
  color: var(--green-deep);
  font-family: var(--mono);
  font-size: 10px;
  font-weight: 700;
}

.service-row h3 {
  margin: 0;
  font-size: 17px;
  letter-spacing: -0.02em;
}

.service-row p {
  margin: 0;
  color: var(--gray-500);
  font-size: 14px;
}

.ledger-panel {
  display: grid;
  grid-template-columns: 1fr minmax(340px, 0.74fr);
  gap: 64px;
  align-items: center;
}

.ledger-principles {
  display: grid;
  grid-template-columns: repeat(2, 1fr);
  gap: 10px;
}

.ledger-principle {
  min-height: 118px;
  padding: 19px;
  border: 1px solid var(--line-dark);
  background: rgba(255, 255, 255, 0.035);
}

.ledger-principle strong {
  display: block;
  margin-bottom: 8px;
  color: var(--green);
  font-family: var(--mono);
  font-size: 10px;
  letter-spacing: 0.08em;
  text-transform: uppercase;
}

.ledger-principle p {
  margin: 0;
  color: rgba(255, 255, 255, 0.54);
  font-size: 14px;
  line-height: 1.48;
}

.risk-note {
  max-width: 760px;
  margin-top: 22px;
  color: rgba(255, 255, 255, 0.72);
  font-family: var(--mono);
  font-size: 11px;
  letter-spacing: 0.025em;
  line-height: 1.7;
  text-transform: uppercase;
}

.dual-cta {
  padding: 82px 0;
  background:
    linear-gradient(rgba(7, 10, 7, 0.93), rgba(7, 10, 7, 0.98)),
    linear-gradient(90deg, transparent, rgba(0, 255, 159, 0.12));
  color: var(--white);
  text-align: center;
}

.dual-cta h2 {
  max-width: 860px;
  margin: 0 auto 18px;
  font-size: clamp(42px, 6vw, 82px);
  font-weight: 840;
  letter-spacing: -0.06em;
  line-height: 0.96;
  text-wrap: balance;
}

.dual-cta p {
  max-width: 650px;
  margin: 0 auto 28px;
  color: rgba(255, 255, 255, 0.61);
  font-size: 19px;
}

.dual-actions {
  display: flex;
  flex-wrap: wrap;
  justify-content: center;
  gap: 10px;
}

.site-footer {
  padding: 60px 0 32px;
  background: #050705;
  color: var(--white);
  border-top: 1px solid var(--line-dark);
}

.footer-top {
  display: grid;
  grid-template-columns: 1.2fr repeat(3, 0.5fr);
  gap: 44px;
  padding-bottom: 45px;
}

.footer-summary {
  max-width: 460px;
  margin: 20px 0 0;
  color: rgba(255, 255, 255, 0.45);
  font-size: 14px;
}

.footer-column h3 {
  margin-bottom: 16px;
  color: rgba(255, 255, 255, 0.38);
  font-family: var(--mono);
  font-size: 9px;
  font-weight: 700;
  letter-spacing: 0.12em;
  text-transform: uppercase;
}

.footer-column a {
  width: fit-content;
  display: block;
  margin-bottom: 11px;
  color: rgba(255, 255, 255, 0.68);
  font-size: 13px;
}

.footer-column a:hover {
  color: var(--green);
}

.footer-bottom {
  display: flex;
  align-items: flex-start;
  justify-content: space-between;
  gap: 40px;
  padding-top: 25px;
  border-top: 1px solid var(--line-dark);
}

.footer-legal {
  max-width: 880px;
  color: rgba(255, 255, 255, 0.68);
  font-family: var(--mono);
  font-size: 11px;
  letter-spacing: 0.02em;
  line-height: 1.7;
  text-transform: uppercase;
}

.footer-copy {
  min-width: max-content;
  color: rgba(255, 255, 255, 0.66);
  font-family: var(--mono);
  font-size: 10px;
  letter-spacing: 0.08em;
  text-transform: uppercase;
}

.subpage-hero {
  position: relative;
  overflow: hidden;
  padding: 86px 0 76px;
  background:
    radial-gradient(circle at 82% 12%, rgba(0, 255, 159, 0.12), transparent 30%),
    var(--ink);
  color: var(--white);
}

.subpage-hero::before {
  position: absolute;
  inset: 0;
  background-image:
    linear-gradient(rgba(255, 255, 255, 0.04) 1px, transparent 1px),
    linear-gradient(90deg, rgba(255, 255, 255, 0.04) 1px, transparent 1px);
  background-size: 72px 72px;
  content: "";
  pointer-events: none;
}

.subpage-hero .container {
  position: relative;
  z-index: 2;
}

.subpage-hero p {
  max-width: 740px;
  color: rgba(255, 255, 255, 0.65);
  font-size: clamp(18px, 1.8vw, 25px);
}

.subpage-hero .hero-actions {
  margin-top: 30px;
  margin-bottom: 0;
}

.content-grid {
  display: grid;
  grid-template-columns: minmax(0, 0.72fr) minmax(0, 1.28fr);
  gap: 62px;
}

.content-aside {
  position: sticky;
  top: 112px;
  align-self: start;
}

.content-card {
  padding: 31px;
  border: 1px solid var(--line-light);
  background: var(--white);
}

.content-card + .content-card {
  margin-top: 14px;
}

.content-card h2 {
  font-size: clamp(28px, 3vw, 42px);
  letter-spacing: -0.045em;
  line-height: 1.06;
}

.content-card h3 {
  letter-spacing: -0.025em;
}

.content-card p,
.content-card li {
  color: var(--gray-700);
}

.content-card ul {
  padding-left: 18px;
  margin-bottom: 0;
}

.pricing-panel {
  padding: 30px;
  border: 1px solid rgba(0, 255, 159, 0.34);
  background: var(--ink);
  color: var(--white);
  box-shadow: var(--shadow-lg);
}

.pricing-panel .price {
  margin: 10px 0 16px;
  color: var(--green);
  font-size: 66px;
  font-weight: 840;
  letter-spacing: -0.065em;
  line-height: 0.92;
}

.pricing-panel p {
  color: rgba(255, 255, 255, 0.59);
}

.pricing-panel .button {
  width: 100%;
  margin-top: 10px;
}

.form-shell {
  padding: 34px;
  border: 1px solid var(--line-light);
  background: var(--white);
  box-shadow: var(--shadow-sm);
}

.form-status {
  margin-bottom: 16px;
  padding: 13px 14px;
  border: 1px solid var(--gray-200);
  background: var(--gray-50);
  color: var(--gray-700);
  font-size: 12px;
  line-height: 1.5;
}

.form-status[data-state="ready"] {
  border-color: rgba(11, 142, 55, 0.35);
  background: rgba(11, 142, 55, 0.06);
}

.form-status[data-state="blocked"] {
  border-color: #d5aa65;
  background: #fff8ea;
}

.button:disabled,
.button[aria-disabled="true"] {
  cursor: not-allowed;
  opacity: 0.56;
  transform: none;
}

.field-grid {
  display: grid;
  grid-template-columns: repeat(2, 1fr);
  gap: 16px;
}

.field {
  display: grid;
  gap: 7px;
}

.field--full {
  grid-column: 1 / -1;
}

.field label {
  font-family: var(--mono);
  font-size: 9px;
  font-weight: 700;
  letter-spacing: 0.09em;
  text-transform: uppercase;
}

.field input,
.field select,
.field textarea {
  width: 100%;
  min-height: 50px;
  padding: 12px 13px;
  border: 1px solid var(--gray-200);
  border-radius: 0;
  background: var(--gray-50);
  color: var(--ink);
}

.field textarea {
  min-height: 126px;
  resize: vertical;
}

.field input:focus,
.field select:focus,
.field textarea:focus {
  outline: 2px solid var(--green-dark);
  outline-offset: 2px;
}

.form-note {
  color: var(--gray-500);
  font-size: 12px;
}

.honeypot {
  position: absolute !important;
  left: -9999px !important;
  width: 1px !important;
  height: 1px !important;
  overflow: hidden !important;
}

.reveal {
  opacity: 0;
  transform: translateY(12px);
  transition: opacity 460ms cubic-bezier(.22,.61,.36,1), transform 460ms cubic-bezier(.22,.61,.36,1);
}

.reveal.is-visible {
  opacity: 1;
  transform: none;
}

@media (max-width: 1120px) {
  .container {
    width: min(var(--container), calc(100% - 44px));
  }

  .nav-links {
    gap: 17px;
  }

  .nav-link {
    font-size: 9px;
  }

  .hero-grid {
    grid-template-columns: 1fr 410px;
    gap: 42px;
  }

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

  .institutional-panel,
  .ledger-panel {
    gap: 40px;
  }
}

@media (max-width: 1020px) {
  :root {
    --nav-height: 70px;
  }

  .section {
    padding: 88px 0;
  }

  .menu-toggle {
    display: inline-flex;
  }

  .nav-links {
    position: fixed;
    inset: var(--nav-height) 0 auto 0;
    height: calc(100vh - var(--nav-height));
    display: none;
    flex-direction: column;
    align-items: stretch;
    gap: 0;
    padding: 24px 22px 40px;
    margin: 0;
    overflow-y: auto;
    background: rgba(7, 10, 7, 0.99);
  }

  .menu-open .nav-links {
    display: flex;
  }

  .nav-link {
    padding: 18px 2px;
    border-bottom: 1px solid var(--line-dark);
    color: rgba(255, 255, 255, 0.82);
    font-size: 12px;
  }

  .nav-link::after {
    display: none;
  }

  .nav-links .nav-cta {
    display: inline-flex;
    margin-top: 18px;
  }

  .nav-shell > .nav-cta {
    display: none;
  }

  .hero {
    min-height: auto;
    padding: 80px 0;
  }

  .hero-grid,
  .domain-layout,
  .method-grid,
  .institutional-panel,
  .ledger-panel,
  .content-grid {
    grid-template-columns: 1fr;
  }

  .research-console {
    max-width: 620px;
  }

  .section-head {
    grid-template-columns: 1fr;
    gap: 16px;
  }

  .section-head .section-lede {
    justify-self: start;
  }

  .method-copy,
  .content-aside {
    position: static;
  }

  .institutional-panel {
    padding: 42px;
  }

  .footer-top {
    grid-template-columns: 1fr repeat(3, 0.5fr);
  }
}

@media (max-width: 680px) {
  .container {
    width: min(var(--container), calc(100% - 30px));
  }

  .section {
    padding: 72px 0;
  }

  .brand-tag {
    display: none;
  }

  .display {
    font-size: clamp(50px, 15vw, 74px);
  }

  .hero-lede {
    font-size: 18px;
  }

  .hero-actions,
  .dual-actions {
    align-items: stretch;
    flex-direction: column;
  }

  .hero-actions .button,
  .dual-actions .button {
    width: 100%;
  }

  .console-inner {
    min-height: 0;
    padding: 14px;
  }

  .console-caption {
    align-items: start;
    flex-direction: column;
  }

  .console-caption .meta-label {
    text-align: left;
  }

  .signal-architecture {
    min-height: 340px;
    padding: 14px 10px;
  }

  .architecture-grid {
    height: 310px;
    grid-template-columns: 1fr 82px 1fr;
    gap: 6px;
  }

  .signal-core {
    width: 82px;
    height: 82px;
    font-size: 8px;
  }

  .source-node,
  .output-node {
    padding: 8px 7px;
    font-size: 7px;
  }

  .signal-architecture::after {
    animation: none;
  }

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

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

  .ladder-grid a:nth-child(odd) {
    border-left: 1px solid var(--line-light);
  }

  .ladder-grid a {
    border-bottom: 1px solid var(--line-light);
  }

  .proof-item:nth-child(odd) {
    border-left: 1px solid var(--line-dark);
  }

  .proof-item {
    border-bottom: 1px solid var(--line-dark);
  }

  .domain-detail {
    height: 560px;
    min-height: 560px;
    padding: 28px;
  }

  .domain-tab {
    grid-template-columns: 32px 1fr auto;
  }

  .method-step {
    grid-template-columns: 38px 1fr;
    gap: 12px;
  }

  .method-step-copy {
    grid-column: 2;
  }

  .research-grid,
  .ledger-principles,
  .field-grid {
    grid-template-columns: 1fr;
  }

  .research-card {
    min-height: 0;
  }

  .file-cover {
    min-height: 220px;
  }

  .institutional-panel {
    padding: 29px 22px;
  }

  .service-row {
    grid-template-columns: 34px 1fr;
  }

  .service-row p {
    grid-column: 2;
  }

  .footer-top {
    grid-template-columns: 1fr 1fr;
  }

  .footer-brand-block {
    grid-column: 1 / -1;
  }

  .footer-bottom {
    flex-direction: column;
    gap: 18px;
  }

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

  .field--full {
    grid-column: auto;
  }
}

@media (max-width: 440px) {
  .proof-grid,
  .ladder-grid,
  .footer-top {
    grid-template-columns: 1fr;
  }

  .proof-item,
  .proof-item:nth-child(odd),
  .ladder-grid a,
  .ladder-grid a:nth-child(odd) {
    border-left: 1px solid var(--line-dark);
  }

  .ladder-grid a,
  .ladder-grid a:nth-child(odd) {
    border-left-color: var(--line-light);
  }

  .footer-brand-block {
    grid-column: auto;
  }

}

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

  *,
  *::before,
  *::after {
    animation-duration: 0.001ms !important;
    animation-iteration-count: 1 !important;
    transition-duration: 0.001ms !important;
  }

  .reveal {
    opacity: 1;
    transform: none;
  }
}