:root {
  --paper: #f2ede2;
  --paper-deep: #e7dfd0;
  --ink: #103f34;
  --ink-dark: #082c26;
  --copper: #c76a3c;
  --sage: #9aac91;
  --line: rgba(16, 63, 52, 0.24);
  --serif: "Iowan Old Style", "Palatino Linotype", Palatino, Georgia, serif;
  --sans: "Avenir Next", Avenir, "Helvetica Neue", Arial, sans-serif;
  --mono: "SFMono-Regular", Consolas, "Liberation Mono", monospace;
  --page-pad: clamp(20px, 4vw, 72px);
}

* {
  box-sizing: border-box;
}

html {
  scroll-behavior: smooth;
  background: var(--ink-dark);
}

html.modal-open,
html.modal-open body {
  overflow: hidden;
}

body {
  margin: 0;
  color: var(--ink);
  background:
    radial-gradient(circle at 25% 8%, rgba(255,255,255,0.28), transparent 30%),
    var(--paper);
  font-family: var(--sans);
  -webkit-font-smoothing: antialiased;
}

body::before {
  position: fixed;
  z-index: 50;
  inset: 0;
  content: "";
  pointer-events: none;
  opacity: 0.08;
  background-image: url("data:image/svg+xml,%3Csvg viewBox='0 0 160 160' xmlns='http://www.w3.org/2000/svg'%3E%3Cfilter id='n'%3E%3CfeTurbulence type='fractalNoise' baseFrequency='.86' numOctaves='3' stitchTiles='stitch'/%3E%3C/filter%3E%3Crect width='100%25' height='100%25' filter='url(%23n)' opacity='.32'/%3E%3C/svg%3E");
  mix-blend-mode: multiply;
}

a {
  color: inherit;
}

button,
input {
  font: inherit;
}

button,
a {
  -webkit-tap-highlight-color: transparent;
}

::selection {
  color: var(--paper);
  background: var(--copper);
}

.sr-only {
  position: absolute;
  width: 1px;
  height: 1px;
  padding: 0;
  margin: -1px;
  overflow: hidden;
  clip: rect(0, 0, 0, 0);
  white-space: nowrap;
  border: 0;
}

.skip-link {
  position: fixed;
  z-index: 100;
  top: 12px;
  left: 12px;
  padding: 12px 16px;
  color: var(--paper);
  background: var(--ink-dark);
  transform: translateY(-150%);
}

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

.site-header {
  position: fixed;
  z-index: 40;
  top: 0;
  left: 0;
  width: 100%;
  min-height: 78px;
  padding: 0 var(--page-pad);
  display: grid;
  grid-template-columns: 1fr auto 1fr;
  align-items: center;
  color: var(--paper);
  border-bottom: 1px solid rgba(242, 237, 226, 0.36);
  transition: min-height 220ms ease, color 220ms ease, background 220ms ease, border-color 220ms ease;
}

.site-header.is-scrolled {
  min-height: 64px;
  color: var(--ink);
  background: rgba(242, 237, 226, 0.92);
  border-color: var(--line);
  backdrop-filter: blur(14px);
}

.wordmark {
  width: max-content;
  font-family: var(--serif);
  font-size: clamp(24px, 2.2vw, 34px);
  font-weight: 700;
  line-height: 1;
  letter-spacing: 0.03em;
  text-decoration: none;
}

.site-nav {
  display: flex;
  gap: clamp(18px, 3vw, 48px);
}

.site-nav a,
.subscribe-link {
  position: relative;
  font-size: 12px;
  font-weight: 600;
  letter-spacing: 0.09em;
  text-decoration: none;
  text-transform: uppercase;
}

.site-nav a::after {
  position: absolute;
  right: 0;
  bottom: -7px;
  left: 0;
  height: 1px;
  content: "";
  background: currentColor;
  transform: scaleX(0);
  transform-origin: right;
  transition: transform 180ms ease;
}

.site-nav a:hover::after,
.site-nav a:focus-visible::after {
  transform: scaleX(1);
  transform-origin: left;
}

.subscribe-link {
  justify-self: end;
  display: flex;
  gap: 10px;
  align-items: center;
}

.cover {
  position: relative;
  min-height: min(970px, 100svh);
  overflow: hidden;
  color: var(--paper);
  background: var(--ink-dark);
  isolation: isolate;
}

.cover-art {
  position: absolute;
  z-index: -3;
  inset: -4%;
  background-image: url("assets/physical-ai-field-atlas-hero-v5.png");
  background-position: center 48%;
  background-size: cover;
  transform: scale(1.03);
  will-change: transform;
}

.cover-art::after {
  position: absolute;
  inset: 0;
  content: "";
  background: linear-gradient(105deg, rgba(4, 36, 30, 0.96) 0%, rgba(4, 36, 30, 0.78) 33%, rgba(4, 36, 30, 0.2) 67%, rgba(4, 36, 30, 0.48) 100%);
  mix-blend-mode: multiply;
}

.cover-wash {
  position: absolute;
  z-index: -2;
  inset: 0;
  background:
    linear-gradient(to top, rgba(5, 32, 27, 0.82), transparent 32%),
    radial-gradient(circle at 78% 25%, rgba(199, 106, 60, 0.2), transparent 24%);
}

.cover::after {
  position: absolute;
  z-index: -1;
  top: 78px;
  right: var(--page-pad);
  bottom: 0;
  left: var(--page-pad);
  content: "";
  border-right: 1px solid rgba(242, 237, 226, 0.23);
  border-left: 1px solid rgba(242, 237, 226, 0.23);
}

.cover-copy {
  position: absolute;
  top: clamp(150px, 19vh, 210px);
  left: var(--page-pad);
  width: min(880px, 83vw);
  padding-left: clamp(18px, 2.4vw, 40px);
}

.eyebrow,
.section-kicker {
  margin: 0;
  font-size: 11px;
  font-weight: 700;
  letter-spacing: 0.17em;
  text-transform: uppercase;
}

.eyebrow {
  margin-bottom: clamp(18px, 3vh, 34px);
  color: #e2b67f;
}

.cover h1 {
  max-width: 1000px;
  margin: 0;
  font-family: var(--serif);
  font-size: clamp(66px, 10.1vw, 170px);
  font-weight: 400;
  line-height: 0.75;
  letter-spacing: -0.07em;
  text-wrap: balance;
}

.cover h1 span {
  display: block;
}

.cover h1 span:first-child {
  margin-left: 0.07em;
  font-family: var(--sans);
  font-size: 0.15em;
  font-weight: 700;
  line-height: 2.5;
  letter-spacing: 0.15em;
  text-transform: uppercase;
}

.cover h1 span:nth-child(2) {
  color: var(--paper);
}

.cover h1 span:nth-child(3) {
  margin-left: 0.52em;
  color: #e6cdb2;
  font-style: italic;
}

.cover-deck {
  max-width: 520px;
  margin: clamp(34px, 5vh, 56px) 0 0 clamp(12px, 17vw, 270px);
  font-family: var(--serif);
  font-size: clamp(17px, 1.45vw, 23px);
  line-height: 1.43;
}

.cover-meta {
  position: absolute;
  z-index: 2;
  font-family: var(--mono);
  font-size: 9px;
  letter-spacing: 0.16em;
  writing-mode: vertical-rl;
  text-transform: uppercase;
}

.cover-meta--left {
  top: 112px;
  left: calc(var(--page-pad) + 1px);
  transform: translateX(-50%) rotate(180deg);
}

.cover-meta--right {
  top: 112px;
  right: calc(var(--page-pad) + 1px);
  transform: translateX(50%);
}

.cover-stats {
  position: absolute;
  right: calc(var(--page-pad) + clamp(18px, 2.4vw, 40px));
  bottom: clamp(44px, 8vh, 88px);
  display: grid;
  gap: 24px;
  width: min(255px, 30vw);
}

.cover-stats div {
  display: grid;
  grid-template-columns: 64px 1fr;
  gap: 14px;
  align-items: baseline;
  padding-top: 10px;
  border-top: 1px solid rgba(242, 237, 226, 0.5);
}

.cover-stats strong {
  font-family: var(--serif);
  font-size: 38px;
  font-weight: 400;
  line-height: 1;
}

.cover-stats span {
  font-size: 10px;
  font-weight: 600;
  letter-spacing: 0.09em;
  text-transform: uppercase;
}

.cover-scroll {
  position: absolute;
  bottom: 0;
  left: calc(var(--page-pad) + clamp(18px, 2.4vw, 40px));
  display: grid;
  gap: 14px;
  color: inherit;
  font-size: 10px;
  font-weight: 700;
  letter-spacing: 0.13em;
  text-decoration: none;
  text-transform: uppercase;
}

.scroll-line {
  position: relative;
  display: block;
  width: 1px;
  height: clamp(36px, 6vh, 72px);
  margin-left: 5px;
  overflow: hidden;
  background: rgba(242, 237, 226, 0.4);
}

.scroll-line::after {
  position: absolute;
  top: -100%;
  left: 0;
  width: 100%;
  height: 70%;
  content: "";
  background: var(--paper);
  animation: scroll-pulse 2.1s ease-in-out infinite;
}

@keyframes scroll-pulse {
  0% { transform: translateY(0); }
  70%, 100% { transform: translateY(290%); }
}

.thesis,
.strata,
.subscribe {
  padding: clamp(84px, 11vw, 170px) var(--page-pad);
}

.section-kicker {
  display: flex;
  gap: 13px;
  align-items: center;
  color: rgba(16, 63, 52, 0.7);
}

.section-kicker span {
  display: inline-grid;
  width: 28px;
  height: 28px;
  place-items: center;
  font-family: var(--mono);
  font-size: 9px;
  border: 1px solid currentColor;
  border-radius: 50%;
}

.thesis-grid {
  display: grid;
  grid-template-columns: minmax(0, 1.7fr) minmax(280px, 0.7fr);
  gap: clamp(50px, 10vw, 160px);
  align-items: end;
  margin-top: clamp(48px, 7vw, 100px);
}

.thesis h2,
.strata h2,
.index-section h2,
.method h2,
.subscribe h2 {
  margin: 0;
  font-family: var(--serif);
  font-weight: 400;
  letter-spacing: -0.045em;
}

.thesis h2 {
  max-width: 1000px;
  font-size: clamp(46px, 6.4vw, 104px);
  line-height: 0.96;
}

.thesis-copy {
  max-width: 460px;
  padding-bottom: 8px;
  font-family: var(--serif);
  font-size: clamp(17px, 1.35vw, 21px);
  line-height: 1.55;
}

.thesis-copy p:first-child::first-letter {
  float: left;
  margin: 0.08em 0.08em 0 0;
  color: var(--copper);
  font-size: 4.5em;
  line-height: 0.68;
}

.thesis-copy p:last-child {
  color: rgba(16, 63, 52, 0.7);
}

.strata {
  padding-top: 30px;
}

.strata-heading {
  display: grid;
  grid-template-columns: 1fr minmax(280px, 0.48fr);
  gap: 60px;
  align-items: end;
  padding-bottom: 48px;
  border-bottom: 1px solid var(--ink);
}

.strata h2 {
  margin-top: 34px;
  font-size: clamp(48px, 6.5vw, 96px);
  line-height: 0.95;
}

.strata-heading > p {
  max-width: 380px;
  margin: 0;
  font-family: var(--serif);
  font-size: 18px;
  line-height: 1.55;
}

.stratum {
  position: relative;
  display: grid;
  grid-template-columns: minmax(100px, 0.45fr) minmax(240px, 1.1fr) minmax(300px, 2.1fr) 36px;
  gap: clamp(18px, 3vw, 48px);
  min-height: 144px;
  padding: 24px 0;
  align-items: center;
  width: 100%;
  color: inherit;
  text-align: left;
  background: transparent;
  border: 0;
  border-bottom: 1px solid var(--line);
  cursor: pointer;
  isolation: isolate;
}

.stratum::before {
  position: absolute;
  z-index: -1;
  inset: 0 calc(var(--page-pad) * -1);
  content: "";
  background: var(--layer-color);
  transform: scaleY(0);
  transform-origin: bottom;
  transition: transform 250ms cubic-bezier(.2,.75,.22,1);
}

.stratum:hover::before,
.stratum:focus-visible::before {
  transform: scaleY(1);
}

.stratum:hover,
.stratum:focus-visible {
  color: var(--paper);
  outline: none;
}

.stratum-count {
  display: flex;
  align-items: baseline;
  font-family: var(--serif);
  font-size: clamp(48px, 5vw, 78px);
  line-height: 1;
}

.stratum-count small {
  margin-left: 7px;
  font-family: var(--mono);
  font-size: 9px;
  letter-spacing: 0.1em;
}

.stratum-name {
  font-family: var(--serif);
  font-size: clamp(24px, 2.4vw, 39px);
  line-height: 1.05;
}

.stratum-samples {
  display: flex;
  flex-wrap: wrap;
  gap: 8px 16px;
  color: rgba(16, 63, 52, 0.72);
  font-family: var(--mono);
  font-size: 10px;
  line-height: 1.4;
}

.stratum:hover .stratum-samples,
.stratum:focus-visible .stratum-samples {
  color: rgba(242, 237, 226, 0.78);
}

.stratum-arrow {
  font-size: 26px;
  transition: transform 180ms ease;
}

.stratum:hover .stratum-arrow,
.stratum:focus-visible .stratum-arrow {
  transform: translate(5px, -5px);
}

.index-section {
  padding: clamp(90px, 10vw, 150px) var(--page-pad);
  color: var(--paper);
  background: var(--ink-dark);
}

.section-kicker--light {
  color: rgba(242, 237, 226, 0.66);
}

.index-heading {
  display: grid;
  grid-template-columns: 1.45fr 0.55fr;
  gap: 60px;
  align-items: end;
}

.index-section h2 {
  margin-top: 38px;
  font-size: clamp(54px, 7vw, 112px);
  line-height: 0.9;
}

.index-note {
  max-width: 390px;
  margin: 0 0 6px;
  color: rgba(242, 237, 226, 0.67);
  font-family: var(--serif);
  font-size: 18px;
  line-height: 1.55;
}

.index-gate[hidden],
.gated-index[hidden] {
  display: none;
}

.index-gate {
  position: relative;
  display: grid;
  grid-template-columns: minmax(240px, 0.72fr) minmax(440px, 1.28fr);
  min-height: 610px;
  margin-top: clamp(64px, 8vw, 118px);
  overflow: hidden;
  color: var(--ink);
  background: var(--paper);
  border: 1px solid rgba(242, 237, 226, 0.34);
  box-shadow: 0 34px 90px rgba(0, 14, 12, 0.28);
}

.index-gate::before {
  position: absolute;
  top: 0;
  right: 0;
  left: 0;
  height: 8px;
  content: "";
  background: linear-gradient(
    90deg,
    #c76a3c 0 12.5%,
    #d5a545 12.5% 25%,
    #7e9a78 25% 37.5%,
    #49766a 37.5% 50%,
    #965345 50% 62.5%,
    #31564e 62.5% 75%,
    #183f35 75% 87.5%,
    #6d5548 87.5% 100%
  );
}

.index-gate__mark {
  position: relative;
  display: flex;
  min-height: 100%;
  padding: clamp(54px, 6vw, 86px) clamp(34px, 4vw, 64px);
  flex-direction: column;
  justify-content: flex-end;
  color: var(--paper);
  background:
    linear-gradient(rgba(8, 44, 38, 0.74), rgba(8, 44, 38, 0.88)),
    url("assets/physical-ai-field-atlas-hero-v5.png") 70% 48% / cover;
}

.index-gate__mark::before {
  position: absolute;
  top: 52px;
  left: clamp(34px, 4vw, 64px);
  width: 54px;
  height: 54px;
  content: "+";
  color: #e2b67f;
  font-family: var(--serif);
  font-size: 64px;
  font-weight: 300;
  line-height: 0.7;
}

.index-gate__mark span {
  font-family: var(--serif);
  font-size: clamp(88px, 11vw, 176px);
  font-weight: 400;
  line-height: 0.72;
  letter-spacing: -0.08em;
}

.index-gate__mark small {
  margin-top: 24px;
  font-family: var(--mono);
  font-size: 9px;
  letter-spacing: 0.13em;
  text-transform: uppercase;
}

.index-gate__copy {
  display: flex;
  padding: clamp(54px, 6vw, 86px);
  flex-direction: column;
  justify-content: center;
}

.index-gate__eyebrow {
  margin: 0 0 22px;
  color: var(--copper);
  font-family: var(--mono);
  font-size: 10px;
  font-weight: 700;
  letter-spacing: 0.14em;
  text-transform: uppercase;
}

.index-gate h3 {
  margin: 0;
  font-family: var(--serif);
  font-size: clamp(42px, 4.5vw, 72px);
  font-weight: 400;
  line-height: 0.94;
  letter-spacing: -0.045em;
}

.index-gate__copy > p:not(.index-gate__eyebrow) {
  max-width: 600px;
  margin: 28px 0 30px;
  color: rgba(16, 63, 52, 0.7);
  font-family: var(--serif);
  font-size: 18px;
  line-height: 1.5;
}

.substack-embed {
  width: 100%;
  overflow: hidden;
}

.substack-embed iframe {
  display: block;
  width: 100%;
  max-width: 100%;
  border: 0;
}

.substack-embed--dark {
  margin: 20px 0 0;
  background: #fff;
  border: 1px solid rgba(16, 63, 52, 0.18);
}

.gate-actions {
  position: relative;
  z-index: 1;
  padding-top: 22px;
  background: var(--paper);
  border-top: 1px solid var(--line);
}

.gate-unlock {
  display: flex;
  gap: 24px;
  align-items: center;
  justify-content: space-between;
  width: 100%;
  padding: 17px 20px;
  color: var(--paper);
  background: var(--ink);
  border: 0;
  cursor: pointer;
  font-family: var(--mono);
  font-size: 10px;
  font-weight: 700;
  letter-spacing: 0.09em;
  text-transform: uppercase;
  transition: color 180ms ease, background 180ms ease;
}

.gate-unlock:hover,
.gate-unlock:focus-visible {
  color: var(--ink-dark);
  background: var(--copper);
}

.gate-actions p {
  margin: 12px 0 0;
  color: rgba(16, 63, 52, 0.58);
  font-family: var(--mono);
  font-size: 9px;
  line-height: 1.45;
}

.gated-index {
  scroll-margin-top: 96px;
}

.index-controls {
  display: grid;
  grid-template-columns: minmax(280px, 0.8fr) 1.5fr;
  gap: clamp(36px, 7vw, 100px);
  align-items: start;
  margin-top: clamp(70px, 8vw, 120px);
  padding: 26px 0;
  border-top: 1px solid rgba(242, 237, 226, 0.35);
  border-bottom: 1px solid rgba(242, 237, 226, 0.35);
}

.search-field {
  display: grid;
  grid-template-columns: auto 1fr auto;
  gap: 14px;
  align-items: center;
  min-height: 46px;
  padding: 0 12px 0 0;
  border-bottom: 1px solid rgba(242, 237, 226, 0.8);
}

.search-field > span:not(.sr-only) {
  font-size: 24px;
}

.search-field input {
  width: 100%;
  padding: 11px 0;
  color: var(--paper);
  background: transparent;
  border: 0;
  outline: 0;
}

.search-field input::placeholder {
  color: rgba(242, 237, 226, 0.55);
}

.search-field input::-webkit-search-cancel-button {
  -webkit-appearance: none;
  appearance: none;
}

.search-field kbd {
  padding: 3px 6px;
  color: rgba(242, 237, 226, 0.5);
  font-family: var(--mono);
  font-size: 9px;
  border: 1px solid rgba(242, 237, 226, 0.25);
  border-radius: 3px;
}

.filter-list {
  display: flex;
  flex-wrap: wrap;
  gap: 8px;
}

.filter-button,
.index-status button,
.empty-state button {
  color: inherit;
  background: transparent;
  border: 0;
  cursor: pointer;
}

.filter-button {
  padding: 9px 12px;
  color: rgba(242, 237, 226, 0.74);
  font-size: 10px;
  font-weight: 700;
  letter-spacing: 0.08em;
  border: 1px solid rgba(242, 237, 226, 0.23);
  border-radius: 999px;
  text-transform: uppercase;
  transition: color 160ms ease, background 160ms ease, border-color 160ms ease;
}

.filter-button:hover,
.filter-button:focus-visible,
.filter-button.is-active {
  color: var(--ink-dark);
  background: var(--paper);
  border-color: var(--paper);
  outline: none;
}

.index-status {
  display: flex;
  justify-content: space-between;
  padding: 24px 0;
  font-family: var(--mono);
  font-size: 10px;
  letter-spacing: 0.1em;
  text-transform: uppercase;
}

.index-status button {
  padding: 0;
  border-bottom: 1px solid currentColor;
}

.company-grid {
  display: grid;
  grid-template-columns: repeat(3, minmax(0, 1fr));
  gap: 0 clamp(32px, 5vw, 78px);
  padding: 0;
  margin: 0;
  list-style: none;
  counter-reset: company;
}

.company-row {
  position: relative;
  display: grid;
  grid-template-columns: 34px 1fr auto;
  gap: 12px;
  min-height: 84px;
  align-items: center;
  border-top: 1px solid rgba(242, 237, 226, 0.2);
  counter-increment: company;
  transition: color 140ms ease;
}

.company-row::before {
  content: counter(company, decimal-leading-zero);
  color: rgba(242, 237, 226, 0.38);
  font-family: var(--mono);
  font-size: 9px;
}

.company-row::after {
  position: absolute;
  right: 0;
  bottom: -1px;
  left: 0;
  height: 2px;
  content: "";
  background: var(--row-color);
  transform: scaleX(0);
  transform-origin: left;
  transition: transform 180ms ease;
}

.company-row:hover::after {
  transform: scaleX(1);
}

.company-name {
  font-family: var(--serif);
  font-size: clamp(17px, 1.45vw, 23px);
  line-height: 1.1;
}

.company-code {
  width: 8px;
  height: 8px;
  background: var(--row-color);
  border-radius: 50%;
}

.empty-state {
  padding: 90px 0;
  text-align: center;
}

.empty-state p {
  font-family: var(--serif);
  font-size: 34px;
}

.empty-state button {
  padding-bottom: 4px;
  border-bottom: 1px solid currentColor;
}

.method {
  position: relative;
  padding: clamp(90px, 12vw, 190px) var(--page-pad) 50px;
  overflow: hidden;
}

.method-marker {
  position: absolute;
  top: 0;
  right: var(--page-pad);
  left: var(--page-pad);
  display: grid;
  grid-template-columns: repeat(8, 1fr);
  gap: 12px;
}

.method-marker span {
  height: 8px;
  background: var(--ink);
}

.method-marker span:nth-child(1) { background: #c76a3c; }
.method-marker span:nth-child(2) { background: #d5a545; }
.method-marker span:nth-child(3) { background: #7e9a78; }
.method-marker span:nth-child(4) { background: #49766a; }
.method-marker span:nth-child(5) { background: #965345; }
.method-marker span:nth-child(6) { background: #31564e; }
.method-marker span:nth-child(7) { background: #183f35; }
.method-marker span:nth-child(8) { background: #6d5548; }

.method-grid {
  display: grid;
  grid-template-columns: 1.08fr 0.92fr;
  gap: clamp(60px, 11vw, 170px);
  align-items: start;
  margin-top: clamp(56px, 8vw, 110px);
}

.method h2 {
  font-size: clamp(54px, 7.3vw, 112px);
  line-height: 0.9;
}

.method-rule {
  padding-top: 26px;
  margin: 0;
  font-family: var(--serif);
  font-size: clamp(25px, 2.5vw, 40px);
  line-height: 1.23;
  border-top: 1px solid var(--ink);
}

.method-exclusion {
  margin: 46px 0 0;
  color: rgba(16, 63, 52, 0.68);
  font-size: 13px;
  line-height: 1.6;
}

.method-exclusion span {
  margin-right: 16px;
  color: var(--copper);
  font-family: var(--mono);
  font-size: 9px;
  font-weight: 700;
  letter-spacing: 0.11em;
  text-transform: uppercase;
}

.method-footer {
  display: flex;
  justify-content: space-between;
  gap: 30px;
  margin-top: clamp(90px, 12vw, 170px);
  padding-top: 18px;
  font-family: var(--mono);
  font-size: 9px;
  letter-spacing: 0.1em;
  border-top: 1px solid var(--line);
  text-transform: uppercase;
}

.subscribe {
  display: grid;
  grid-template-columns: 1.15fr 0.85fr;
  gap: clamp(70px, 10vw, 150px);
  align-items: end;
  color: var(--paper);
  background: var(--copper);
}

.subscribe .section-kicker {
  color: rgba(242, 237, 226, 0.74);
}

.subscribe h2 {
  margin-top: 38px;
  font-size: clamp(52px, 6vw, 96px);
  line-height: 0.92;
}

.subscribe-form__label {
  margin-bottom: 28px;
  font-family: var(--serif);
  font-size: 24px;
}

.substack-embed--copper {
  margin: 20px 0;
  background: #fff;
  border: 1px solid rgba(242, 237, 226, 0.58);
}

.subscribe-form > p {
  margin: 18px 0 0;
  font-family: var(--mono);
  font-size: 9px;
  letter-spacing: 0.08em;
  text-transform: uppercase;
}

.site-footer {
  display: grid;
  grid-template-columns: 1fr 1fr auto;
  gap: 40px;
  align-items: end;
  padding: 70px var(--page-pad) 44px;
  color: var(--paper);
  background: var(--ink-dark);
}

.wordmark--footer {
  font-size: clamp(56px, 8vw, 130px);
}

.site-footer p {
  max-width: 370px;
  margin: 0;
  color: rgba(242, 237, 226, 0.65);
  font-family: var(--serif);
  font-size: 17px;
  line-height: 1.5;
}

.site-footer > span {
  font-family: var(--mono);
  font-size: 9px;
  letter-spacing: 0.08em;
  text-transform: uppercase;
}

.footer-tools { display: flex; flex-direction: column; align-items: flex-end; gap: 10px; }
.footer-tools button { border: 0; background: none; color: inherit; font: inherit; text-decoration: underline; cursor: pointer; }
.modal-unlock { width: 100%; margin-top: 18px; }
.modal-access-note { font-size: 12px; line-height: 1.5; margin: 10px 0; }
.signup-fallback { font-size: 12px; text-underline-offset: 3px; }
.gate-actions > a { font-size: 12px; color: inherit; }
@media (max-width: 700px) { .footer-tools { align-items: flex-start; } }

.subscribe-modal[hidden] {
  display: none;
}

.subscribe-modal {
  position: fixed;
  z-index: 100;
  inset: 0;
  display: grid;
  place-items: center;
  padding: clamp(18px, 4vw, 56px);
}

.subscribe-modal__backdrop {
  position: absolute;
  inset: 0;
  width: 100%;
  height: 100%;
  padding: 0;
  border: 0;
  cursor: pointer;
  background: rgba(4, 31, 26, 0.8);
  backdrop-filter: blur(9px) saturate(0.78);
  animation: modal-fade 260ms ease-out both;
}

.subscribe-modal__panel {
  position: relative;
  width: min(720px, 100%);
  max-height: calc(100svh - 36px);
  padding: clamp(40px, 6.4vw, 88px);
  overflow: auto;
  color: var(--ink);
  background:
    linear-gradient(rgba(255, 255, 255, 0.08), rgba(255, 255, 255, 0.08)),
    var(--paper);
  border: 1px solid rgba(242, 237, 226, 0.42);
  box-shadow: 0 40px 100px rgba(1, 18, 15, 0.48), 0 0 0 1px rgba(8, 44, 38, 0.2);
  isolation: isolate;
  animation: modal-rise 420ms cubic-bezier(0.2, 0.8, 0.2, 1) both;
}

.subscribe-modal__panel::before {
  position: absolute;
  top: 0;
  right: 0;
  left: 0;
  height: 8px;
  content: "";
  background: linear-gradient(
    90deg,
    #c76a3c 0 12.5%,
    #d5a545 12.5% 25%,
    #7e9a78 25% 37.5%,
    #49766a 37.5% 50%,
    #965345 50% 62.5%,
    #31564e 62.5% 75%,
    #183f35 75% 87.5%,
    #6d5548 87.5% 100%
  );
}

.subscribe-modal__panel::after {
  position: absolute;
  z-index: -1;
  right: 28px;
  bottom: 28px;
  width: 90px;
  height: 90px;
  content: "+";
  color: rgba(16, 63, 52, 0.08);
  font-family: var(--serif);
  font-size: 150px;
  line-height: 0.5;
}

.subscribe-modal__close {
  position: absolute;
  top: 22px;
  right: 22px;
  display: grid;
  width: 38px;
  height: 38px;
  padding: 0;
  place-items: center;
  color: var(--ink);
  background: transparent;
  border: 1px solid var(--line);
  border-radius: 50%;
  cursor: pointer;
  transition: color 180ms ease, background 180ms ease, transform 180ms ease;
}

.subscribe-modal__close span {
  margin-top: -2px;
  font-size: 25px;
  font-weight: 300;
  line-height: 1;
}

.subscribe-modal__close:hover,
.subscribe-modal__close:focus-visible {
  color: var(--paper);
  background: var(--ink);
  transform: rotate(5deg);
}

.subscribe-modal .section-kicker {
  margin: 0 52px 40px 0;
}

.subscribe-modal__edition {
  margin: 0 0 15px;
  color: var(--copper);
  font-family: var(--mono);
  font-size: 10px;
  font-weight: 700;
  letter-spacing: 0.16em;
}

.subscribe-modal h2 {
  margin: 0;
  font-family: var(--serif);
  font-size: clamp(48px, 6.1vw, 78px);
  font-weight: 400;
  line-height: 0.92;
  letter-spacing: -0.045em;
}

.subscribe-modal__description {
  max-width: 530px;
  margin: 30px 0 42px;
  color: rgba(16, 63, 52, 0.72);
  font-family: var(--serif);
  font-size: clamp(18px, 2vw, 22px);
  line-height: 1.45;
}

.substack-embed--modal {
  margin: 20px 0 0;
  background: #fff;
  border: 1px solid var(--line);
}

.subscribe-modal__continue {
  display: flex;
  gap: 18px;
  align-items: center;
  justify-content: space-between;
  width: 100%;
  padding: 16px 0 5px;
  color: rgba(16, 63, 52, 0.62);
  font-family: var(--mono);
  font-size: 10px;
  font-weight: 700;
  letter-spacing: 0.08em;
  text-decoration: none;
  text-transform: uppercase;
  border-bottom: 1px solid var(--line);
  transition: color 180ms ease, border-color 180ms ease;
}

.subscribe-modal__continue:hover,
.subscribe-modal__continue:focus-visible {
  color: var(--ink);
  border-color: var(--ink);
}

@keyframes modal-fade {
  from { opacity: 0; }
  to { opacity: 1; }
}

@keyframes modal-rise {
  from {
    opacity: 0;
    transform: translateY(24px) scale(0.985);
  }
  to {
    opacity: 1;
    transform: translateY(0) scale(1);
  }
}

:focus-visible {
  outline: 2px solid var(--copper);
  outline-offset: 4px;
}

@media (max-width: 980px) {
  .site-header {
    grid-template-columns: 1fr auto;
  }

  .site-nav {
    display: none;
  }

  .cover h1 {
    line-height: 0.82;
  }

  .cover-deck {
    margin-left: clamp(12px, 11vw, 120px);
  }

  .thesis-grid,
  .strata-heading,
  .index-heading,
  .method-grid,
  .subscribe {
    grid-template-columns: 1fr;
  }

  .thesis-copy,
  .index-note {
    margin-left: 20vw;
  }

  .stratum {
    grid-template-columns: 100px minmax(230px, 1fr) 1.7fr 30px;
  }

  .index-controls {
    grid-template-columns: 1fr;
  }

  .company-grid {
    grid-template-columns: repeat(2, minmax(0, 1fr));
  }

  .index-gate {
    grid-template-columns: minmax(210px, 0.55fr) minmax(420px, 1fr);
  }

  .subscribe-form {
    max-width: 680px;
    margin-left: 18vw;
  }

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

  .site-footer > span {
    grid-column: 2;
  }
}

@media (max-width: 700px) {
  .site-header {
    min-height: 64px;
  }

  .subscribe-link {
    font-size: 10px;
  }

  .cover {
    min-height: 830px;
  }

  .cover::after {
    top: 64px;
  }

  .cover-art {
    background-position: 63% center;
  }

  .cover-art::after {
    background: linear-gradient(to bottom, rgba(4, 36, 30, 0.7), rgba(4, 36, 30, 0.27) 48%, rgba(4, 36, 30, 0.88));
  }

  .cover-copy {
    top: 120px;
    width: calc(100vw - (var(--page-pad) * 2));
  }

  .cover h1 {
    font-size: clamp(56px, 18vw, 90px);
    line-height: 0.84;
  }

  .cover h1 span:nth-child(3) {
    margin-left: 0;
  }

  .cover-deck {
    max-width: 330px;
    margin: 42px 0 0;
    font-size: 18px;
  }

  .cover-stats {
    right: calc(var(--page-pad) + 18px);
    bottom: 58px;
    left: calc(var(--page-pad) + 18px);
    grid-template-columns: repeat(3, 1fr);
    gap: 12px;
    width: auto;
  }

  .cover-stats div {
    grid-template-columns: 1fr;
    gap: 4px;
  }

  .cover-stats strong {
    font-size: 30px;
  }

  .cover-scroll,
  .cover-meta {
    display: none;
  }

  .thesis-copy,
  .index-note,
  .subscribe-form {
    margin-left: 0;
  }

  .thesis-grid {
    gap: 36px;
  }

  .strata-heading {
    gap: 32px;
  }

  .stratum {
    grid-template-columns: 68px 1fr 26px;
    min-height: 122px;
  }

  .stratum-samples {
    display: none;
  }

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

  .index-gate {
    grid-template-columns: 1fr;
    min-height: 0;
  }

  .index-gate__mark {
    min-height: 270px;
    padding: 58px 28px 30px;
  }

  .index-gate__mark::before {
    top: 42px;
    left: 28px;
  }

  .index-gate__mark span {
    font-size: 104px;
  }

  .index-gate__copy {
    padding: 44px 24px 30px;
  }

  .index-gate h3 {
    font-size: clamp(39px, 12vw, 54px);
  }

  .substack-embed--dark {
    margin-right: -10px;
    margin-left: -10px;
    width: calc(100% + 20px);
  }

  .method-footer,
  .site-footer {
    display: grid;
    grid-template-columns: 1fr;
  }

  .method-footer span:last-child,
  .site-footer > span {
    grid-column: 1;
  }

  .subscribe-modal {
    align-items: end;
    padding: 12px;
  }

  .subscribe-modal__panel {
    max-height: calc(100svh - 24px);
    padding: 44px 24px 32px;
  }

  .subscribe-modal__close {
    top: 20px;
    right: 20px;
  }

  .subscribe-modal .section-kicker {
    margin-bottom: 34px;
  }

  .subscribe-modal h2 {
    font-size: clamp(43px, 13.5vw, 60px);
  }

  .subscribe-modal__description {
    margin: 24px 0 30px;
    font-size: 18px;
  }

  .substack-embed--modal {
    margin-right: -8px;
    margin-left: -8px;
    width: calc(100% + 16px);
  }
}

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

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