@font-face {
  font-family: "Ice Serif";
  src: url("assets/heading.woff2") format("woff2");
  font-weight: 600;
  font-display: swap;
}
:root {
  --paper: #e8eeea;
  --ink: #214954;
  --muted: #49625f;
  --rust: #a2442b;
  --line: #b7c6c0;
  --gutter: clamp(24px, 6.5vw, 110px);
  --serif: "Ice Serif", "Songti SC", serif;
  --sans: "Avenir Next", "PingFang SC", "Microsoft YaHei", sans-serif;
}
* {
  box-sizing: border-box;
}
html {
  scroll-behavior: smooth;
  scroll-padding-top: 83px;
}
body {
  margin: 0;
  background: var(--paper);
  color: var(--ink);
  font: 14px/1.9 var(--sans);
  -webkit-font-smoothing: antialiased;
}
h1,
h2,
h3,
p,
figure {
  margin: 0;
}
h1,
h2 {
  font-family: var(--serif);
  font-weight: 600;
}
h2 {
  font-size: clamp(35px, 3.6vw, 55px);
  line-height: 1.65;
  letter-spacing: -0.04em;
}
h3 {
  font-weight: 500;
  font-size: 20px;
}
button,
input {
  font: inherit;
}
a {
  color: inherit;
  text-decoration: none;
}
button {
  background: none;
  color: inherit;
  border: 0;
}
button,
summary {
  cursor: pointer;
}
button,
a,
summary {
  touch-action: manipulation;
  -webkit-tap-highlight-color: transparent;
}
button:hover,
a:hover {
  color: var(--rust);
}
img {
  display: block;
  width: 100%;
  height: auto;
}
svg {
  max-width: 100%;
}
button:focus-visible,
a:focus-visible,
summary:focus-visible,
input:focus-visible {
  outline: 2px solid var(--rust);
  outline-offset: 6px;
}
::selection {
  background: #c78d6c;
  color: #102c34;
}
p {
  overflow-wrap: break-word;
}
.skip-link {
  position: fixed;
  left: 18px;
  top: -100px;
  background: var(--paper);
  padding: 15px;
  z-index: 100;
}
.skip-link:focus {
  top: 10px;
}
.brand {
  display: flex;
  align-items: center;
  gap: 15px;
}
.brand img {
  width: 42px;
}
.brand > span {
  font: 600 23px/1.5 var(--serif);
  letter-spacing: 0.11em;
}
.brand small {
  display: block;
  font: 8px/1.7 var(--sans);
  letter-spacing: 0.2em;
  margin-top: 5px;
}
.site-header {
  position: absolute;
  top: 0;
  left: 0;
  width: 100%;
  padding: 34px var(--gutter);
  display: flex;
  align-items: center;
  justify-content: space-between;
  z-index: 3;
}
.edition {
  font-size: 10px;
  letter-spacing: 0.12em;
}
.edition i {
  font-style: normal;
  margin: 0 16px;
  color: #8b9b97;
}
.header-actions {
  display: flex;
  align-items: center;
  gap: 26px;
  font-size: 11px;
}
.header-actions button {
  font-size: 11px;
  border-left: 1px solid #8b9b976b;
  padding: 0 0 0 25px;
  min-height: 34px;
}
.header-actions button > span:first-child {
  font-size: 24px;
  vertical-align: middle;
  margin-right: 6px;
}
.eyebrow {
  font-size: 10px;
  line-height: 1.6;
  letter-spacing: 0.16em;
}
.tiny-cross {
  font-size: 22px;
  margin-right: 14px;
  color: var(--rust);
}
.hero {
  height: 100svh;
  min-height: 840px;
  max-height: 1240px;
  position: relative;
  overflow: hidden;
  isolation: isolate;
  background: #dce4de;
}
.hero-art {
  position: absolute;
  inset: -25px 0;
  z-index: -2;
  transform: translateY(var(--parallax, 0px));
}
.hero-art img {
  height: 100%;
  object-fit: cover;
  object-position: 50% 55%;
}
.hero:after {
  content: "";
  position: absolute;
  inset: 0;
  background:
    linear-gradient(0deg, #163644cf, transparent 28%),
    linear-gradient(90deg, #edf0eac2, transparent 65%);
  z-index: -1;
}
.hero-copy {
  padding: 185px var(--gutter) 130px;
}
.hero h1 {
  font-size: clamp(80px, 7vw, 108px);
  line-height: 1.35;
  letter-spacing: -0.055em;
  margin-top: 27px;
}
.hero h1 span {
  color: #67827c;
}
.hero-intro {
  margin-top: 23px;
  font-size: 15px;
  line-height: 2.1;
  letter-spacing: 0.06em;
}
.primary-link {
  display: inline-flex;
  align-items: center;
  gap: 44px;
  margin-top: 31px;
  font-size: 12px;
  color: #f3efe3;
  background: var(--rust);
  padding: 15px 20px;
}
.primary-link span {
  font-size: 23px;
}
.primary-link:hover {
  background: #773520;
  color: #f3efe3;
}
.hero-aside {
  position: absolute;
  right: var(--gutter);
  top: 180px;
  font-size: 12px;
  line-height: 2.1;
  color: #263e47;
}
.hero-bottom {
  position: absolute;
  bottom: 28px;
  left: var(--gutter);
  right: var(--gutter);
  display: flex;
  justify-content: space-between;
  align-items: center;
  font-size: 10px;
  color: #f1f1e7;
}
.hero-bottom > span:first-child {
  display: flex;
  align-items: center;
  gap: 15px;
}
.scroll-line {
  height: 30px;
  width: 1px;
  background: currentColor;
}
.chapter-nav {
  height: 83px;
  position: sticky;
  top: 0;
  z-index: 20;
  display: flex;
  align-items: center;
  padding: 0 var(--gutter);
  gap: 30px;
  background: #e8eeea;
  border-bottom: 1px solid var(--line);
}
.nav-mark img {
  width: 25px;
}
.chapter-nav nav {
  display: flex;
  flex: 1;
  justify-content: center;
  gap: clamp(16px, 4vw, 62px);
}
.chapter-nav nav a {
  font-size: 12px;
  white-space: nowrap;
  position: relative;
  padding: 28px 0;
}
.chapter-nav nav a > span {
  font:
    10px Georgia,
    serif;
  margin-right: 8px;
  color: #526b64;
}
.chapter-nav nav a[aria-current] {
  color: var(--rust);
}
.chapter-nav nav a[aria-current]:after {
  content: "";
  position: absolute;
  bottom: 15px;
  left: 0;
  right: 0;
  height: 1px;
  background: var(--rust);
}
.chapter-position {
  font-size: 12px;
  min-width: 62px;
}
.chapter-position small {
  display: block;
  font-size: 9px;
  color: var(--muted);
  letter-spacing: 0.04em;
}
.reading-progress {
  position: absolute;
  bottom: -1px;
  height: 2px;
  left: 0;
  width: 100%;
  transform: scaleX(var(--progress, 0));
  transform-origin: left;
  background: var(--rust);
}
.section {
  padding: 94px var(--gutter) 108px;
}
.section-top {
  display: flex;
  align-items: center;
  justify-content: space-between;
  padding-bottom: 25px;
  border-bottom: 1px solid var(--line);
  margin-bottom: 78px;
}
.section-note {
  font-size: 10px;
  color: var(--muted);
}
.lead {
  font-size: 17px;
  line-height: 2.2;
  margin-top: 28px;
}
.body-copy {
  font-size: 13px;
  line-height: 2.15;
  color: var(--muted);
  margin-top: 25px;
  max-width: 430px;
}
.aside-note {
  border-left: 1px solid #9d7661;
  padding-left: 22px;
  margin-top: 36px;
  font-size: 12px;
  line-height: 2;
  color: var(--muted);
}
.citation {
  font: 10px var(--sans);
  vertical-align: super;
  padding: 3px;
  color: var(--rust);
}
.micro {
  font-size: 10px;
  line-height: 1.9;
  color: var(--muted);
}
.snow {
  background: linear-gradient(#e8eeea, #dbe6e1);
}
.snow-grid {
  display: grid;
  grid-template-columns: 1fr 1fr;
  gap: 9%;
  align-items: center;
}
.firn-exhibit {
  max-width: 540px;
}
.diagram-heading {
  display: flex;
  justify-content: space-between;
  font-size: 12px;
}
.firn-exhibit svg {
  display: block;
  width: 100%;
  margin: 15px 0 8px;
}
.diagram-field {
  fill: #cfdddd;
}
.snow-grains circle {
  fill: #edf2ea;
  stroke: #aec3bf;
  stroke-width: 1.2;
}
.packed-grains rect {
  fill: #e7f0e9;
  stroke: #b6cac4;
  stroke-width: 1.2;
}
.closed-grains rect {
  fill: #8eafb5;
}
.closed-grains ellipse {
  fill: #d6e7df;
  stroke: #507883;
  stroke-width: 1.2;
}
.air-route {
  fill: none;
  stroke: var(--rust);
  stroke-width: 2;
  stroke-dasharray: 4 8;
  animation: airflow 6s linear infinite;
  animation-play-state: paused;
}
.in-view .air-route {
  animation-play-state: running;
}
.air-key {
  font: 12px var(--sans);
  fill: #743921;
}
.firn-control,
.record-control {
  display: grid;
  grid-template-columns: 1fr auto;
  align-items: center;
  gap: 12px 20px;
  font-size: 12px;
}
.firn-control output {
  color: var(--rust);
}
input[type="range"] {
  grid-column: 1/-1;
  width: 100%;
  margin: 9px 0;
  height: 22px;
  accent-color: var(--rust);
  cursor: ew-resize;
  touch-action: pan-y;
}
.range-ends {
  display: flex;
  justify-content: space-between;
  grid-column: 1/-1;
  font-size: 10px;
  color: var(--muted);
}
.firn-description {
  font-size: 13px;
  line-height: 2;
  min-height: 62px;
  margin: 25px 0 12px;
}
.air {
  position: relative;
  isolation: isolate;
  background: #123441;
  overflow: hidden;
  min-height: 930px;
  color: #ebeee1;
}
.air-art {
  position: absolute;
  inset: -25px 0;
  z-index: -2;
  transform: translateY(var(--parallax, 0px));
}
.air-art img {
  height: 100%;
  object-fit: cover;
  object-position: 60% center;
}
.air:after {
  content: "";
  position: absolute;
  inset: 0;
  z-index: -1;
  background: linear-gradient(
    90deg,
    #0c2c3be8 5%,
    #153849c7 42%,
    #15384905 74%
  );
}
.air-content {
  padding: 99px var(--gutter);
  max-width: 800px;
}
.air-content > h2 {
  margin-top: 65px;
  font-size: clamp(36px, 3.5vw, 53px);
}
.air-content > .lead {
  margin: 26px 0;
}
.air-content > p:not(.eyebrow):not(.lead) {
  font-size: 13px;
  line-height: 2.15;
  max-width: 390px;
  color: #c7d9d7;
}
.air .citation {
  color: #edbfa0;
}
.two-clocks {
  border-top: 1px solid #6f969b;
  padding-top: 26px;
  max-width: 410px;
  margin-top: 45px;
}
.two-clocks > span {
  font-size: 11px;
  letter-spacing: 0.07em;
}
.two-clocks > div {
  display: flex;
  gap: 35px;
  align-items: center;
  margin: 20px 0 25px;
}
.two-clocks > div p {
  font: 600 20px/1.8 var(--serif);
}
.two-clocks small {
  display: block;
  font: 10px/1.8 var(--sans);
  color: #c7d9d7;
  margin-bottom: 8px;
}
.two-clocks i {
  font-size: 21px;
  font-style: normal;
  color: #dcab8c;
}
.clock-note {
  font-size: 12px;
  line-height: 2.1;
  color: #c7d9d7;
}
.air-caption {
  position: absolute;
  bottom: 25px;
  right: var(--gutter);
  color: #d0e1dc;
}
.core {
  background: #e7eeea;
}
.core-heading {
  display: flex;
  align-items: end;
  justify-content: space-between;
  gap: 50px;
}
.core-heading > p {
  color: var(--muted);
  font-size: 13px;
  line-height: 2.1;
  max-width: 370px;
  padding-bottom: 9px;
}
.specimen-frame {
  position: relative;
  margin: 38px -3.5vw 0;
  isolation: isolate;
  overflow: hidden;
}
.specimen-art {
  aspect-ratio: 2.35;
}
.specimen-art img {
  height: 100%;
  object-fit: cover;
  mix-blend-mode: normal;
  filter: brightness(0.98);
  transition: filter 0.45s ease;
}
.lit .specimen-art img {
  filter: brightness(1.1);
}
.specimen-tag {
  position: absolute;
  left: 3.5vw;
  right: 3.5vw;
  top: 23px;
  display: flex;
  justify-content: space-between;
  font-size: 9px;
  letter-spacing: 0.06em;
  color: #536f6f;
}
.clue-marker {
  position: absolute;
  left: 43%;
  top: 55%;
  display: flex;
  align-items: center;
  gap: 18px;
  color: #762f20;
  font-size: 11px;
  pointer-events: none;
}
.clue-marker i {
  width: 56px;
  height: 56px;
  display: block;
  border: 1px solid #8d3c25;
  border-radius: 50%;
  box-shadow: 0 0 0 6px #e9ece55e;
}
.clue-marker > span {
  background: #eef1e9e8;
  padding: 4px 9px;
}
.specimen-frame[data-clue="1"] .clue-marker {
  left: 65%;
  top: 39%;
}
.specimen-frame[data-clue="2"] .clue-marker {
  left: 26%;
  top: 53%;
}
.light-button {
  position: absolute;
  right: 3.5vw;
  bottom: 20px;
  display: flex;
  align-items: center;
  gap: 10px;
  font-size: 11px;
  border-bottom: 1px solid #7e9691;
  padding: 10px 0;
}
.light-button > span:first-child {
  font-size: 24px;
}
.light-button[aria-pressed="true"] {
  color: var(--rust);
}
.inspection {
  display: grid;
  grid-template-columns: 1fr 1.25fr;
  gap: 9%;
  margin-top: 18px;
  border-top: 1px solid var(--line);
  padding-top: 32px;
}
.clue-controls {
  display: flex;
  gap: 28px;
  align-items: start;
}
.clue-controls button {
  display: flex;
  flex-direction: column;
  align-items: flex-start;
  gap: 8px;
  font-size: 14px;
  padding: 0 0 10px;
  border-bottom: 1px solid transparent;
}
.clue-controls button > span {
  font-size: 10px;
  color: #526b64;
}
.clue-controls button[aria-pressed="true"] {
  border-color: var(--rust);
  color: var(--rust);
}
.clue-copy p {
  margin: 15px 0 12px;
  color: var(--muted);
  font-size: 13px;
  line-height: 2.1;
  min-height: 54px;
}
.text-link {
  display: inline-block;
  font-size: 11px;
  border-bottom: 1px solid #8faaa3;
  padding: 6px 0;
}
.light-note {
  margin-top: 30px;
}
details {
  border-top: 1px solid var(--line);
  border-bottom: 1px solid var(--line);
}
summary {
  list-style: none;
  display: flex;
  align-items: center;
  justify-content: space-between;
  gap: 15px;
  font-size: 13px;
  padding: 23px 0;
}
summary::-webkit-details-marker {
  display: none;
}
summary > span {
  font-size: 10px;
  color: var(--muted);
  display: flex;
  align-items: center;
  gap: 20px;
  white-space: nowrap;
}
summary i {
  font-style: normal;
  font-size: 21px;
  font-weight: 300;
  line-height: 1;
}
details[open] > summary i {
  transform: rotate(45deg);
}
.size-details {
  margin-top: 45px;
}
.size-content {
  display: grid;
  grid-template-columns: 1fr 1.3fr;
  gap: 8%;
  padding: 12px 0 36px;
  align-items: center;
}
.size-content > div > p {
  font-size: 12px;
  line-height: 2.1;
  margin-top: 18px;
  color: var(--muted);
  max-width: 330px;
}
.size-content > div > p.micro {
  font-size: 10px;
}
.size-content h3 {
  font: 600 25px/1.8 var(--serif);
}
#size-diagram {
  display: block;
  width: 100%;
}
.size-ruler,
.size-baseline {
  fill: none;
  stroke: #658b8b;
  stroke-width: 1;
}
.size-baseline {
  stroke: #a5bdb5;
}
#size-diagram text {
  font: 15px var(--sans);
  fill: #305863;
}
.record {
  background: #193f4b;
  color: #ecf0e5;
}
.record .section-top {
  border-color: #64838a;
}
.record .section-note,
.record .micro {
  color: #c0d2cb;
}
.record-heading {
  display: flex;
  align-items: end;
  justify-content: space-between;
  gap: 50px;
}
.record-heading > p {
  font-size: 13px;
  line-height: 2.2;
  color: #c0d2cb;
  max-width: 330px;
}
.record .citation {
  color: #e8ba98;
}
.archive-readout {
  display: flex;
  align-items: end;
  gap: 70px;
  margin: 54px 0 12px;
}
.archive-readout small {
  font-size: 10px;
  color: #c0d2cb;
}
.archive-readout > div > p {
  line-height: 1.2;
  margin-top: 15px;
}
.archive-readout output {
  font:
    48px Georgia,
    serif;
  letter-spacing: -0.03em;
}
.archive-readout p > span {
  margin-left: 10px;
  font-size: 11px;
  color: #c0d2cb;
}
.selection-note {
  font-size: 11px;
  color: #c0d2cb;
  line-height: 2;
  margin-left: auto;
}
.chart-wrap {
  margin: 38px -2vw 0;
  touch-action: pan-y;
}
.chart-wrap svg {
  display: block;
  width: 100%;
  cursor: crosshair;
  touch-action: pan-y;
}
.chart-grid {
  fill: none;
  stroke: #52757e;
  stroke-width: 1;
  stroke-dasharray: 2 5;
}
.chart-labels {
  font: 12px var(--sans);
  fill: #c4d7d1;
}
.co2-path {
  fill: none;
  stroke: #c1d5c4;
  stroke-width: 1.5;
  vector-effect: non-scaling-stroke;
}
#cursor-line {
  fill: none;
  stroke: #df9f74;
  stroke-width: 1;
  stroke-dasharray: 3 4;
}
#cursor-point {
  fill: #eea477;
  stroke: #193f4b;
  stroke-width: 2;
}
#cursor-error {
  stroke: #eeb494;
  stroke-width: 2;
  fill: none;
}
.record-control {
  max-width: 720px;
  margin: 30px auto 0;
}
.record-control input {
  accent-color: #d79268;
}
.record-control .range-ends {
  color: #c0d2cb;
}
.text-button {
  font-size: 10px;
  border-bottom: 1px solid #77968e;
  padding: 3px 0;
}
.record button:hover {
  color: #f2bd90;
}
.sample-note {
  font-size: 10px;
  text-align: center;
  color: #c0d2cb;
  margin: 26px 0 50px;
}
.record details {
  border-color: #64838a;
}
.record summary > span {
  color: #c0d2cb;
}
.data-copy {
  display: grid;
  grid-template-columns: 1fr 1fr;
  gap: 20px 7%;
  padding: 10px 0 35px;
  font-size: 12px;
  line-height: 2;
  color: #c0d2cb;
}
.data-copy > .text-link {
  justify-self: start;
  align-self: end;
  color: #e8e8d4;
}
.future {
  background: linear-gradient(#e5eae2, #eaeade);
  padding-top: 97px;
}
.future-grid {
  display: grid;
  grid-template-columns: 1fr 1fr;
  align-items: center;
  gap: 14%;
}
.future .text-link {
  margin-top: 25px;
}
.time-card {
  position: relative;
  background: #f1f0e5;
  padding: 32px 35px;
  transform: rotate(2deg);
  box-shadow: 0 14px 40px #27483c0d;
  border: 1px solid #b1bcac;
  max-width: 470px;
  justify-self: end;
  width: 100%;
}
.card-top {
  display: flex;
  align-items: center;
  gap: 15px;
  padding-bottom: 24px;
  border-bottom: 1px solid #b1bcac;
}
.card-top img {
  width: 39px;
}
.card-top > span {
  font-size: 12px;
}
.card-top small {
  font-size: 8px;
  letter-spacing: 0.14em;
}
.card-top .card-number {
  margin-left: auto;
  font:
    25px Georgia,
    serif;
  color: #5b7167;
}
.card-title {
  margin-top: 26px;
  font-size: 11px;
  color: var(--muted);
}
.card-age > span {
  display: block;
  font:
    52px/1.5 Georgia,
    serif;
  letter-spacing: -0.035em;
}
.card-age small {
  display: block;
  font-size: 10px;
  color: var(--muted);
}
.card-bottom {
  display: flex;
  align-items: center;
  justify-content: space-between;
  margin: 29px 0 24px;
  gap: 12px;
}
.card-bottom > p {
  font:
    17px Georgia,
    serif;
}
.card-bottom > span {
  font-size: 9px;
  color: var(--muted);
}
.card-rule {
  border-top: 1px dashed #96a898;
  margin-bottom: 20px;
}
.time-card > button {
  margin-top: 28px;
  width: 100%;
  background: var(--ink);
  color: #f0eddf;
  padding: 13px 17px;
  font-size: 11px;
  display: flex;
  justify-content: space-between;
  align-items: center;
}
.time-card > button:hover {
  background: #32616b;
}
.time-card > button > span {
  font-size: 21px;
}
#save-status:empty {
  display: none;
}
#save-status {
  margin-top: 12px;
}
.memory-index {
  margin-top: 105px;
  padding-top: 25px;
  border-top: 1px solid var(--line);
  display: flex;
  align-items: center;
  justify-content: space-between;
  gap: 30px;
}
.memory-index > span {
  font-size: 10px;
  color: var(--muted);
}
.memory-index > p {
  font-size: 11px;
  color: var(--muted);
}
.memory-index b {
  font-weight: 500;
  color: var(--ink);
  margin-right: 6px;
}
.memory-index i {
  font-style: normal;
  margin: 0 13px;
}
.return-link {
  font-size: 12px;
  white-space: nowrap;
}
.return-link span {
  font-size: 19px;
  margin-left: 17px;
}
.sources {
  padding: 62px var(--gutter) 28px;
  background: #d7e0d7;
}
.footer-heading {
  display: flex;
  align-items: center;
  justify-content: space-between;
  margin-bottom: 44px;
  gap: 30px;
}
.footer-heading > p {
  font-size: 12px;
  color: var(--muted);
}
.footer-heading > span {
  font-size: 10px;
  color: var(--muted);
}
.sources-content {
  padding: 5px 0 30px;
}
.sources-content > p {
  font-size: 12px;
  color: #48645f;
  line-height: 2.1;
  max-width: 900px;
  margin: 10px 0 20px;
}
.source-list {
  display: grid;
  grid-template-columns: 1fr 1fr;
  gap: 25px 7%;
  padding: 15px 0 10px 20px;
  font-size: 12px;
}
.source-list li {
  padding-left: 6px;
}
.source-list li > a {
  font-size: 12px;
  border-bottom: 1px solid #9db1a3;
}
.source-list p {
  font-size: 11px;
  margin-top: 9px;
  line-height: 2;
  color: #48645f;
}
.source-list li:target {
  background: #edf0e19c;
  outline: 8px solid #edf0e19c;
}
.asset-links {
  display: flex;
  gap: 30px;
  align-items: center;
  margin-top: 35px;
  font-size: 10px;
}
.asset-links > span {
  margin-left: auto;
  color: var(--muted);
}
.footer-bottom {
  display: flex;
  justify-content: space-between;
  align-items: center;
  gap: 25px;
  padding-top: 28px;
  font-size: 10px;
}
.footer-bottom nav {
  display: flex;
  gap: 27px;
}
.no-script {
  padding: 20px var(--gutter);
  font-size: 12px;
}
.reduced-motion * {
  animation: none !important;
  transition: none !important;
}
html:has(.reduced-motion) {
  scroll-behavior: auto;
}
.reduced-motion .parallax {
  transform: none !important;
}
.reduced-motion .time-card {
  transform: none;
}
.reduced-motion .air-route {
  stroke-dasharray: 4 8;
}
@media (prefers-reduced-motion: reduce) {
  html {
    scroll-behavior: auto;
  }
  * {
    animation: none !important;
    transition: none !important;
  }
  .parallax {
    transform: none !important;
  }
}
@keyframes airflow {
  to {
    stroke-dashoffset: -120;
  }
}
@media (min-width: 1700px) {
  .section,
  .sources {
    padding-left: max(var(--gutter), calc((100vw - 1500px) / 2));
    padding-right: max(var(--gutter), calc((100vw - 1500px) / 2));
  }
  .hero-copy {
    padding-top: 230px;
  }
  .hero h1 {
    font-size: 125px;
  }
}
@media (max-width: 1050px) {
  .edition {
    display: none;
  }
  .hero-aside {
    max-width: 160px;
    top: 145px;
  }
  .snow-grid {
    gap: 6%;
  }
  .section {
    padding-top: 75px;
    padding-bottom: 85px;
  }
  .section-top {
    margin-bottom: 60px;
  }
  .core-heading > p {
    max-width: 300px;
  }
  .air-content {
    max-width: 650px;
  }
  .air:after {
    background: linear-gradient(
      90deg,
      #0c2c3bee 5%,
      #153849dc 48%,
      #15384933 90%
    );
  }
  .clue-marker > span {
    font-size: 10px;
  }
  .future-grid {
    gap: 8%;
  }
  .time-card {
    padding: 26px;
  }
  .card-age > span {
    font-size: 45px;
  }
  .memory-index {
    flex-wrap: wrap;
  }
  .memory-index > p {
    order: 3;
    width: 100%;
  }
  .memory-index {
    row-gap: 20px;
  }
  .archive-readout {
    gap: 48px;
  }
}
@media (max-width: 760px) {
  html {
    scroll-padding-top: 73px;
  }
  .site-header {
    padding-top: 23px;
    padding-bottom: 23px;
  }
  .brand > span {
    font-size: 19px;
  }
  .brand img {
    width: 34px;
  }
  .brand {
    gap: 10px;
  }
  .brand small {
    font-size: 7px;
    letter-spacing: 0.12em;
  }
  .header-actions {
    gap: 15px;
    font-size: 10px;
  }
  .header-actions button {
    font-size: 10px;
    border: 0;
    padding: 0;
  }
  .header-actions button > span:first-child {
    display: none;
  }
  .hero {
    min-height: 800px;
    max-height: 1040px;
  }
  .hero-copy {
    padding-top: 165px;
  }
  .hero h1 {
    font-size: clamp(68px, 11vw, 86px);
  }
  .hero-aside {
    display: none;
  }
  .hero-art img {
    object-position: 57% center;
  }
  .hero:after {
    background:
      linear-gradient(0deg, #163644cf, transparent 28%),
      linear-gradient(90deg, #edf0ead9, transparent 85%);
  }
  .hero-bottom {
    font-size: 9px;
  }
  .hero-bottom > span:nth-child(2) {
    display: none;
  }
  .chapter-nav {
    height: 73px;
    padding: 0 var(--gutter);
    gap: 20px;
  }
  .nav-mark {
    display: none;
  }
  .chapter-nav nav {
    justify-content: space-between;
    gap: 12px;
  }
  .chapter-nav nav a {
    font-size: 11px;
    padding: 21px 0;
  }
  .chapter-nav nav a > span {
    display: none;
  }
  .chapter-nav nav a[aria-current]:after {
    bottom: 12px;
  }
  .chapter-position {
    min-width: 45px;
    border-left: 1px solid var(--line);
    padding-left: 15px;
    font-size: 10px;
  }
  .chapter-position small {
    font-size: 8px;
    white-space: nowrap;
  }
  .section-top {
    margin-bottom: 45px;
    padding-bottom: 20px;
  }
  .section-note {
    font-size: 9px;
  }
  .eyebrow {
    font-size: 9px;
  }
  .snow-grid {
    grid-template-columns: 1fr;
  }
  .section-copy {
    max-width: 470px;
  }
  .firn-exhibit {
    max-width: 500px;
    margin: 50px auto 0;
    width: 100%;
  }
  .firn-description {
    min-height: 50px;
  }
  .firn-exhibit svg {
    max-height: 400px;
  }
  .air {
    min-height: 900px;
  }
  .air-art img {
    object-position: 70% center;
  }
  .air:after {
    background:
      linear-gradient(90deg, #0c2c3bde 5%, #153849b0 82%),
      linear-gradient(0deg, #102e3bbb, transparent 60%);
  }
  .air-content {
    padding: 75px var(--gutter) 70px;
    max-width: 550px;
  }
  .air-content > h2 {
    margin-top: 45px;
  }
  .air-caption {
    font-size: 9px;
  }
  .core-heading,
  .record-heading {
    display: block;
  }
  .core-heading > p,
  .record-heading > p {
    margin-top: 25px;
    max-width: 450px;
  }
  .specimen-frame {
    margin: 20px -24px 0;
  }
  .specimen-art {
    aspect-ratio: 1.7;
  }
  .specimen-art img {
    object-fit: contain;
    mix-blend-mode: normal;
  }
  .specimen-tag {
    left: 24px;
    right: 24px;
    top: 15px;
    font-size: 8px;
  }
  .specimen-tag > span:first-child {
    display: none;
  }
  .specimen-tag > span:last-child {
    margin-left: auto;
  }
  .light-button {
    right: 24px;
    bottom: 7px;
    font-size: 10px;
  }
  .clue-marker {
    left: 40%;
    top: 50%;
    gap: 8px;
  }
  .clue-marker i {
    width: 37px;
    height: 37px;
  }
  .clue-marker > span {
    font-size: 9px;
    padding: 3px 6px;
  }
  .specimen-frame[data-clue="1"] .clue-marker {
    left: 66%;
    top: 37%;
    flex-direction: column;
    gap: 9px;
  }
  .specimen-frame[data-clue="2"] .clue-marker {
    left: 25%;
    top: 55%;
  }
  .inspection {
    display: block;
    margin-top: 10px;
    padding-top: 25px;
  }
  .clue-controls {
    gap: 35px;
  }
  .clue-controls button {
    font-size: 13px;
    flex-direction: row;
    align-items: center;
    gap: 8px;
  }
  .clue-copy {
    margin-top: 25px;
  }
  .clue-copy h3 {
    font-size: 19px;
  }
  .light-note {
    margin-top: 25px;
    font-size: 9px;
  }
  summary {
    font-size: 12px;
  }
  summary > span {
    font-size: 9px;
    gap: 12px;
  }
  .size-content {
    grid-template-columns: 1fr;
    gap: 15px;
  }
  .size-content > div > p {
    max-width: none;
  }
  .size-content h3 {
    font-size: 23px;
  }
  .size-content h3 br {
    display: none;
  }
  #size-diagram text {
    font-size: 20px;
  }
  #size-diagram {
    max-height: 390px;
  }
  .record {
    padding-bottom: 75px;
  }
  .archive-readout {
    gap: 45px;
    margin-top: 38px;
    flex-wrap: wrap;
  }
  .archive-readout output {
    font-size: 40px;
  }
  .archive-readout > div > p {
    margin-top: 10px;
  }
  .archive-readout small {
    font-size: 9px;
  }
  .selection-note {
    display: none;
  }
  .chart-wrap {
    margin-top: 32px;
    margin-left: -13px;
    margin-right: -13px;
  }
  .chart-labels {
    font-size: 18px;
  }
  .co2-path {
    stroke-width: 1.2;
  }
  #cursor-point {
    r: 7;
  }
  .record-control {
    margin-top: 20px;
  }
  .record-control > label {
    font-size: 11px;
  }
  .sample-note {
    text-align: left;
    font-size: 10px;
    margin: 22px 0 32px;
  }
  .data-copy {
    grid-template-columns: 1fr;
  }
  .future-grid {
    grid-template-columns: 1fr;
    gap: 55px;
  }
  .future .section-copy {
    max-width: 470px;
  }
  .time-card {
    justify-self: center;
    max-width: 440px;
    padding: 30px;
  }
  .card-age > span {
    font-size: 52px;
  }
  .memory-index {
    margin-top: 73px;
  }
  .memory-index > p {
    line-height: 2.5;
    font-size: 10px;
  }
  .memory-index i {
    margin: 0 9px;
  }
  .sources {
    padding-top: 45px;
  }
  .footer-heading {
    flex-wrap: wrap;
    gap: 20px;
    margin-bottom: 30px;
  }
  .footer-heading > p {
    font-size: 11px;
    margin-left: auto;
  }
  .footer-heading > span {
    display: none;
  }
  .source-list {
    grid-template-columns: 1fr;
    gap: 23px;
  }
  .asset-links {
    flex-wrap: wrap;
    gap: 15px 25px;
  }
  .asset-links > span {
    width: 100%;
    margin-left: 0;
  }
  .footer-bottom {
    flex-wrap: wrap;
    font-size: 9px;
    row-gap: 20px;
  }
  .footer-bottom nav {
    order: 3;
    width: 100%;
    justify-content: center;
    border-top: 1px solid var(--line);
    padding-top: 20px;
    gap: 35px;
  }
}
@media (max-width: 430px) {
  .header-actions {
    gap: 13px;
    font-size: 9px;
  }
  .header-actions button {
    font-size: 9px;
  }
  .hero {
    min-height: 780px;
  }
  .hero-copy {
    padding-top: 162px;
  }
  .hero h1 {
    font-size: clamp(60px, 15vw, 69px);
    margin-top: 24px;
    line-height: 1.45;
  }
  .hero-intro {
    font-size: 13px;
    margin-top: 22px;
  }
  .primary-link {
    margin-top: 28px;
    padding: 11px 17px;
    gap: 28px;
    font-size: 11px;
  }
  .hero-art img {
    object-position: 61% center;
  }
  .hero-bottom {
    font-size: 8px;
    bottom: 23px;
    gap: 10px;
  }
  .hero-bottom > span:first-child {
    gap: 9px;
  }
  .section {
    padding-top: 62px;
    padding-bottom: 68px;
  }
  .section-top {
    margin-bottom: 37px;
    gap: 15px;
  }
  .section-note {
    max-width: 110px;
    text-align: right;
    font-size: 8px;
  }
  .section-top .eyebrow {
    font-size: 8px;
    letter-spacing: 0.1em;
  }
  h2 {
    font-size: 33px;
    line-height: 1.7;
  }
  .lead {
    font-size: 15px;
    margin-top: 22px;
  }
  .body-copy {
    font-size: 12px;
  }
  .aside-note {
    font-size: 11px;
    margin-top: 25px;
  }
  .firn-exhibit {
    margin-top: 40px;
  }
  .firn-description {
    font-size: 12px;
    min-height: 72px;
  }
  .firn-exhibit > .micro {
    font-size: 9px;
  }
  .diagram-heading {
    font-size: 11px;
  }
  .air {
    min-height: 890px;
  }
  .air-content {
    padding-top: 63px;
    padding-bottom: 80px;
  }
  .air-content > h2 {
    font-size: 33px;
  }
  .air-content > .lead {
    font-size: 15px;
  }
  .air-content > p:not(.eyebrow):not(.lead) {
    font-size: 12px;
  }
  .two-clocks {
    margin-top: 35px;
  }
  .two-clocks > div {
    gap: 28px;
  }
  .two-clocks > div p {
    font-size: 19px;
  }
  .clock-note {
    font-size: 11px;
  }
  .core-heading > p {
    font-size: 12px;
  }
  .specimen-art {
    aspect-ratio: 1.42;
  }
  .clue-marker {
    top: 52%;
  }
  .specimen-frame[data-clue="1"] .clue-marker {
    top: 42%;
  }
  .specimen-frame[data-clue="2"] .clue-marker {
    top: 53%;
  }
  .light-button {
    bottom: 7px;
  }
  .clue-controls {
    justify-content: space-between;
    gap: 20px;
  }
  .clue-copy p {
    font-size: 12px;
  }
  .clue-copy h3 {
    font-size: 18px;
  }
  summary > span {
    font-size: 8px;
    gap: 9px;
  }
  summary {
    font-size: 11px;
    gap: 9px;
  }
  .size-content > div > p {
    font-size: 11px;
  }
  #size-diagram text {
    font-size: 23px;
  }
  .archive-readout {
    gap: 30px;
  }
  .archive-readout output {
    font-size: 35px;
  }
  .archive-readout small {
    font-size: 8px;
  }
  .archive-readout p > span {
    font-size: 10px;
    margin-left: 6px;
  }
  .record-heading > p {
    font-size: 12px;
  }
  .chart-wrap {
    margin: 26px -18px 0;
  }
  .chart-labels {
    font-size: 18px;
  }
  .record-control {
    gap: 10px;
  }
  .text-button {
    font-size: 9px;
  }
  .data-copy {
    font-size: 11px;
  }
  .time-card {
    padding: 25px;
    transform: rotate(1.5deg);
  }
  .card-age > span {
    font-size: 46px;
  }
  .card-top > span {
    font-size: 11px;
  }
  .card-top img {
    width: 35px;
  }
  .card-bottom {
    gap: 8px;
  }
  .card-bottom > span {
    font-size: 8px;
  }
  .card-bottom > p {
    font-size: 16px;
  }
  .memory-index > p {
    max-width: 290px;
  }
  .memory-index i:nth-of-type(2) {
    display: block;
    height: 0;
    visibility: hidden;
  }
  .footer-heading > p {
    font-size: 9px;
  }
  .footer-heading .brand > span {
    font-size: 17px;
  }
}