@font-face {
  font-family: "Sky Serif";
  src: url("assets/heading.woff2") format("woff2");
  font-weight: 600;
  font-display: swap;
}
:root {
  --ink: #203d48;
  --muted: #4c6974;
  --line: #96acb3;
  --paper: #dce8e9;
  --accent: #d9ba7f;
  --sans: "Avenir Next", "PingFang SC", "Microsoft YaHei", sans-serif;
  --display: "Sky Serif", "Songti SC", serif;
  --gutter: clamp(24px, 6.5vw, 110px);
}
* {
  box-sizing: border-box;
}
html {
  scroll-behavior: smooth;
  scroll-padding-top: 94px;
}
body {
  margin: 0;
  color: var(--ink);
  background: var(--paper);
  font: 14px/1.95 var(--sans);
  -webkit-font-smoothing: antialiased;
}
h1,
h2,
h3,
h4,
p,
figure {
  margin: 0;
}
h1,
h2 {
  font: 600 clamp(34px, 3.7vw, 56px)/1.65 var(--display);
  letter-spacing: -0.04em;
}
h3,
h4 {
  font-weight: 400;
}
p {
  overflow-wrap: break-word;
}
a {
  color: inherit;
  text-decoration: none;
}
button,
input {
  font: inherit;
}
button,
a,
summary {
  -webkit-tap-highlight-color: transparent;
  touch-action: manipulation;
}
button,
summary {
  cursor: pointer;
}
button {
  color: inherit;
  background: none;
  border: 0;
}
input {
  accent-color: #927144;
  cursor: pointer;
}
button:hover,
a:hover {
  color: #815b27;
}
img {
  display: block;
  width: 100%;
  height: auto;
}
svg {
  max-width: 100%;
}
::selection {
  background: #c1a16b;
  color: #0a2332;
}
:focus-visible {
  outline: 2px solid #ad7c39;
  outline-offset: 6px;
}
.svg-library {
  position: absolute;
  width: 0;
  height: 0;
  overflow: hidden;
}
.skip-link {
  position: fixed;
  left: 12px;
  top: 12px;
  z-index: 50;
  padding: 10px 20px;
  background: #203d48;
  color: #eff3eb;
  transform: translateY(-200%);
}
.skip-link:focus {
  transform: none;
}
.site-header {
  position: absolute;
  top: 0;
  left: 0;
  right: 0;
  z-index: 4;
  height: 110px;
  padding: 0 var(--gutter);
  display: flex;
  align-items: center;
  justify-content: space-between;
}
.brand {
  display: inline-flex;
  align-items: center;
  gap: 15px;
  font: 600 25px/1.5 var(--display);
  letter-spacing: 0.17em;
}
.brand svg {
  width: 36px;
  height: 36px;
}
.brand small {
  font: 8px/1.5 var(--sans);
  display: block;
  letter-spacing: 0.22em;
  margin-top: 6px;
}
.edition {
  font-size: 10px;
  letter-spacing: 0.14em;
}
.edition b {
  font-weight: 400;
  margin-left: 20px;
}
.site-header nav {
  display: flex;
  gap: 30px;
  align-items: center;
  font-size: 11px;
}
.site-header button {
  display: flex;
  gap: 9px;
  align-items: center;
  font-size: 11px;
  border-left: 1px solid #708b965c;
  padding-left: 25px;
  min-height: 35px;
}
.site-header button > span:first-child {
  font-size: 22px;
}
.eyebrow {
  font-size: 10px;
  letter-spacing: 0.15em;
  line-height: 1.8;
}
.overline {
  font-size: 12px;
  color: var(--muted);
  margin-bottom: 26px;
}
.intro {
  font-size: 16px;
  line-height: 2.2;
}
.body-copy {
  font-size: 13px;
  line-height: 2.1;
  color: var(--muted);
  margin-top: 25px;
}
.citation {
  font: 10px var(--sans);
  padding: 3px;
  vertical-align: super;
}
.hero {
  height: 100svh;
  min-height: 850px;
  max-height: 1200px;
  position: relative;
  overflow: hidden;
  background: #b8cfdc;
  isolation: isolate;
}
.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: center 55%;
}
.hero:after {
  content: "";
  position: absolute;
  inset: 0;
  background:
    linear-gradient(180deg, #e1eaed94, transparent 51%, #0c2b3fbd 100%),
    linear-gradient(90deg, #e4eced85, transparent 69%);
  z-index: -1;
}
.hero-copy {
  padding: clamp(175px, 20vh, 240px) var(--gutter) 145px;
  position: relative;
  max-width: 850px;
}
.hero-copy > .eyebrow {
  display: flex;
  align-items: center;
  gap: 20px;
}
.hero-copy > .eyebrow:before {
  content: "";
  height: 5px;
  width: 5px;
  border-radius: 50%;
  background: #385763;
}
.hero h1 {
  font-size: clamp(82px, 7.7vw, 124px);
  line-height: 1.35;
  letter-spacing: -0.045em;
  margin: 30px 0 30px;
  color: #193c49;
}
.hero h1 span {
  color: #506e78;
}
.hero-description {
  display: flex;
  align-items: center;
  gap: 45px;
}
.hero-description > p {
  font-size: 13px;
  line-height: 2;
  letter-spacing: 0.04em;
}
.primary-link {
  display: inline-flex;
  gap: 36px;
  align-items: center;
  padding: 11px 22px;
  min-height: 50px;
  background: #274b59;
  color: #edf1e9;
  font-size: 12px;
  border-radius: 2px;
}
.primary-link span {
  font-size: 22px;
}
.primary-link:hover {
  background: #173c4b;
  color: #f9f2df;
}
.hero-bottom {
  position: absolute;
  bottom: 31px;
  left: var(--gutter);
  right: var(--gutter);
  display: flex;
  justify-content: space-between;
  align-items: center;
  color: #ecf0e7;
  font-size: 10px;
  letter-spacing: 0.06em;
}
.hero-bottom p {
  display: flex;
  align-items: center;
  gap: 15px;
}
.scroll-line {
  height: 32px;
  width: 1px;
  background: #e6ece2;
  display: inline-block;
}
.hero-bottom > span:last-child {
  font-size: 9px;
}
.altitude-nav {
  height: 74px;
  position: sticky;
  top: 0;
  z-index: 20;
  display: flex;
  align-items: center;
  gap: 7%;
  padding: 0 var(--gutter);
  background: #e0e9e8fa;
  color: #28414b;
  border-top: 1px solid #a3b5b9;
  border-bottom: 1px solid #a3b5b9;
}
.altitude-readout {
  min-width: 165px;
  display: flex;
  gap: 18px;
  align-items: center;
}
.altitude-readout small {
  font-size: 8px;
  line-height: 1.5;
  white-space: nowrap;
}
.altitude-readout small span {
  display: block;
}
.altitude-readout > span {
  white-space: nowrap;
}
.altitude-readout b {
  font:
    32px/1 Georgia,
    serif;
  font-variant-numeric: tabular-nums;
  display: inline-block;
  min-width: 54px;
  text-align: right;
}
.altitude-readout i {
  font: 10px var(--sans);
}
.altitude-readout > span > span {
  font-size: 13px;
  margin-left: 12px;
}
.altitude-nav nav {
  display: flex;
  gap: clamp(24px, 4vw, 60px);
  align-items: center;
  height: 100%;
}
.altitude-nav nav a {
  display: flex;
  align-items: center;
  gap: 10px;
  height: 100%;
  position: relative;
  font-size: 12px;
  white-space: nowrap;
}
.altitude-nav nav a > span {
  font-size: 8px;
  color: #47636f;
}
.altitude-nav nav a[aria-current="location"] {
  color: #755727;
}
.altitude-nav nav a[aria-current="location"]:after {
  content: "";
  position: absolute;
  left: 0;
  right: 0;
  bottom: 0;
  height: 2px;
  background: #8e7247;
}
.atlas-link {
  margin-left: auto;
  font-size: 10px;
  white-space: nowrap;
}
.altitude-progress {
  position: absolute;
  left: 0;
  right: 0;
  bottom: -1px;
  height: 1px;
}
.altitude-progress i {
  display: block;
  width: 100%;
  height: 1px;
  background: #536f7a;
  transform: scaleX(var(--progress, 0));
  transform-origin: left;
}
.scene:not(.hero) {
  padding: 78px var(--gutter) 85px;
}
.section-top {
  display: flex;
  align-items: center;
  justify-content: space-between;
  padding-bottom: 24px;
  border-bottom: 1px solid var(--line);
  margin-bottom: 75px;
  gap: 25px;
}
.section-top .eyebrow > span {
  font-size: 9px;
  letter-spacing: 0.13em;
  margin-left: 22px;
  color: var(--muted);
}
.height-range {
  font:
    22px Georgia,
    serif;
  white-space: nowrap;
}
.height-range > span {
  font: 10px var(--sans);
  color: var(--muted);
  margin-left: 9px;
}
.split-heading {
  display: grid;
  grid-template-columns: 1.25fr 1fr;
  gap: 16%;
  align-items: center;
}
.split-heading h2 {
  max-width: 650px;
}
.split-heading > div {
  max-width: 355px;
}
.line-button {
  display: inline-flex;
  align-items: center;
  gap: 35px;
  border-bottom: 1px solid currentColor;
  padding: 8px 0;
  min-height: 44px;
  font-size: 11px;
}
.line-button > span {
  font-size: 17px;
}
.clouds {
  background: #dce8e9;
}
.scatter-exhibit {
  display: grid;
  grid-template-columns: 0.9fr 1.5fr;
  gap: 10%;
  align-items: center;
  margin-top: 95px;
  border-top: 1px solid var(--line);
  padding-top: 45px;
}
.scatter-caption h3 {
  font: 600 28px/1.7 var(--display);
  margin: 20px 0 14px;
}
.scatter-caption > p:nth-of-type(2) {
  font-size: 12px;
  line-height: 2.1;
  max-width: 305px;
  color: var(--muted);
}
.scatter-caption .line-button {
  margin-top: 22px;
}
.scatter-caption small {
  display: block;
  color: var(--muted);
  font-size: 9px;
  line-height: 1.8;
  margin-top: 13px;
}
.scatter-figure {
  min-width: 0;
}
.scatter-figure svg {
  display: block;
  width: 100%;
}
.scatter-figure text {
  font: 11px var(--sans);
  fill: #416272;
}
.scatter-paths {
  opacity: 0;
  transition: opacity 0.4s;
}
.scatter-figure.show-paths .scatter-paths {
  opacity: 1;
}
.incident-ray {
  stroke-dashoffset: 0;
  animation: light-ray 7s linear infinite;
  animation-play-state: paused;
}
.in-view .incident-ray {
  animation-play-state: running;
}
@keyframes light-ray {
  to {
    stroke-dashoffset: -130;
  }
}
.stratosphere {
  background: #d2e0e4;
  position: relative;
  padding-bottom: 120px !important;
  --line: #94abb7;
  --muted: #405f6e;
}
.balloon-exhibit {
  display: grid;
  grid-template-columns: 1fr 1.12fr;
  align-items: center;
  column-gap: 9%;
  row-gap: 28px;
}
.balloon-copy {
  grid-column: 1;
  grid-row: 1;
}
.instrument-panel {
  grid-column: 1;
  grid-row: 2;
}
.balloon-figure {
  grid-column: 2;
  grid-row: 1 / 3;
}
.balloon-copy h2 {
  font-size: clamp(34px, 3.4vw, 53px);
}
.balloon-copy .intro {
  margin-top: 24px;
}
.balloon-copy > .body-copy {
  max-width: 365px;
}
.instrument-controls {
  display: flex;
  gap: 25px;
  margin-top: 0;
  flex-wrap: wrap;
}
.instrument-controls button {
  padding: 5px 0 9px;
  border-bottom: 1px solid #8aa4af;
  font-size: 12px;
  min-height: 42px;
}
.instrument-controls button span {
  font-size: 8px;
  margin-right: 8px;
}
.instrument-controls button[aria-pressed="true"] {
  color: #775628;
  border-color: #775628;
}
.instrument-story {
  min-height: 165px;
  margin-top: 24px;
  max-width: 365px;
}
.instrument-story > .eyebrow {
  font-size: 9px;
  color: #405f6e;
}
.instrument-story h3 {
  font-size: 18px;
  margin: 10px 0 11px;
  line-height: 1.7;
}
.instrument-story > p:last-child {
  font-size: 12px;
  line-height: 2;
  color: var(--muted);
}
.balloon-figure {
  width: 100%;
  min-width: 0;
  align-self: stretch;
  display: flex;
  flex-direction: column;
  justify-content: center;
}
.balloon-frame {
  position: relative;
  aspect-ratio: 1/1.2;
  overflow: hidden;
  background: #d2e0e4;
}
.balloon-frame img {
  height: 100%;
  object-fit: cover;
  object-position: center;
  mix-blend-mode: normal;
}
.part-marker {
  position: absolute;
  left: 61%;
  border: 1px solid #36515c;
  width: 34px;
  height: 34px;
  border-radius: 50%;
  display: grid;
  place-items: center;
  font: 11px var(--sans);
  background: #e4ececbf;
  opacity: 0.4;
  transition:
    opacity 0.2s,
    background 0.2s;
}
.part-marker:before {
  content: "";
  position: absolute;
  height: 1px;
  width: 25px;
  right: 100%;
  background: #36515c;
  top: 50%;
}
.part-0 {
  top: 20%;
}
.part-1 {
  top: 61%;
  left: 57%;
}
.part-2 {
  top: 87%;
  left: 57%;
}
.balloon-frame[data-instrument="0"] .part-0,
.balloon-frame[data-instrument="1"] .part-1,
.balloon-frame[data-instrument="2"] .part-2 {
  opacity: 1;
  background: #f2e2bd;
}
.balloon-figure figcaption {
  font-size: 9px;
  color: #405f6e;
  text-align: center;
  margin-top: 15px;
}
.size-details {
  border-top: 1px solid var(--line);
  border-bottom: 1px solid var(--line);
  margin-top: 55px;
}
.size-details summary {
  padding: 22px 0;
  display: flex;
  justify-content: space-between;
  align-items: center;
  list-style: none;
  font-size: 14px;
}
.size-details summary small {
  font-size: 10px;
  margin-left: 30px;
  color: var(--muted);
}
summary::-webkit-details-marker {
  display: none;
}
.size-details summary > span:last-child {
  font:
    24px Georgia,
    serif;
}
.size-details[open] summary > span:last-child {
  transform: rotate(45deg);
}
.size-content {
  padding: 13px 0 32px;
}
.size-content > p:first-child {
  font-size: 12px;
  max-width: 680px;
  line-height: 2;
  color: var(--muted);
}
.size-content svg {
  max-width: 950px;
  display: block;
  margin: 35px auto 10px;
  width: 100%;
}
.size-content svg text {
  font: 13px var(--sans);
  fill: #345462;
}
.size-content svg text:nth-of-type(n + 4) {
  font-size: 11px;
}
.figure-note {
  font-size: 10px;
  color: var(--muted);
  line-height: 2;
}
.dark {
  color: #e9eee8;
  --muted: #b1c2d1;
  --line: #4b6277;
}
.dark a:hover,
.dark button:hover {
  color: #ebcf9b;
}
.mesosphere {
  background: #1b334c;
  position: relative;
}
.mesosphere:before {
  content: "";
  position: absolute;
  left: 0;
  right: 0;
  top: -75px;
  height: 75px;
  background: linear-gradient(to bottom, #d2e0e4, #1b334c);
}
.mesosphere .split-heading {
  gap: 13%;
}
.mesosphere .split-heading h2 {
  font-size: clamp(34px, 3.4vw, 53px);
}
.night-figure {
  margin: 62px calc(var(--gutter) * -1) 0;
}
.night-frame {
  position: relative;
  height: clamp(380px, 45vw, 670px);
  overflow: hidden;
}
.night-frame img {
  height: 100%;
  object-fit: cover;
  object-position: center 68%;
  mask-image: linear-gradient(to bottom, transparent, #000 16%);
}
.night-annotations {
  position: absolute;
  inset: 0;
  pointer-events: none;
}
.night-annotations > span {
  position: absolute;
  background: #10283de6;
  color: #e8e9d9;
  padding: 9px 14px;
  font-size: 11px;
  border-left: 1px solid #d9c798;
}
.cloud-annotation {
  left: 53%;
  top: 38%;
}
.ground-annotation {
  left: 19%;
  bottom: 9%;
}
.night-figure figcaption {
  display: flex;
  justify-content: space-between;
  align-items: center;
  gap: 30px;
  padding: 22px var(--gutter);
  color: #c0cfda;
  font-size: 10px;
}
.night-figure .line-button {
  min-width: 172px;
  justify-content: space-between;
}
.transition-note {
  border-top: 1px solid var(--line);
  padding-top: 28px;
  margin-top: 30px;
  font-size: 11px;
  color: #b8cbd8;
}
.transition-note > span {
  color: #e2cb9e;
  margin-right: 25px;
}
.thermosphere {
  background: linear-gradient(#1b334c, #0a1728 23%, #080f1b) #1b334c;
  padding-bottom: 60px !important;
  --line: #435769;
}
.threshold-intro {
  color: #b7c9d7;
  font-size: 14px;
  letter-spacing: 0.12em;
  text-align: center;
  margin-top: 25px;
}
.karman {
  padding-top: 55px;
  text-align: center;
}
.karman-number {
  font:
    clamp(150px, 20vw, 310px)/1 Georgia,
    serif;
  letter-spacing: -0.055em;
  color: #e5e8e0;
  position: relative;
  display: inline-block;
}
.karman-number > span {
  font: 14px var(--sans);
  letter-spacing: 0;
  position: absolute;
  right: -42px;
  bottom: 20%;
}
.karman-line {
  display: flex;
  gap: 24px;
  align-items: center;
  justify-content: center;
  margin: 32px 0 46px;
}
.karman-line i {
  height: 1px;
  width: 23%;
  max-width: 290px;
  border-top: 1px dashed #7b91a3;
}
.karman-line > span {
  font-size: 10px;
  letter-spacing: 0.18em;
  color: #cfbb96;
}
.karman h2 {
  font-size: clamp(34px, 3.6vw, 53px);
  line-height: 1.7;
}
.karman > p:last-child {
  font-size: 13px;
  line-height: 2.2;
  color: #b4c5d1;
  margin-top: 23px;
}
.horizon-figure {
  margin: 75px 0 0;
}
.horizon-figure img {
  max-height: 650px;
  object-fit: cover;
  object-position: center 55%;
  width: 100%;
}
.horizon-figure figcaption {
  display: flex;
  justify-content: space-between;
  align-items: flex-start;
  gap: 30px;
  padding: 22px 0;
  border-bottom: 1px solid var(--line);
}
.horizon-figure figcaption > span {
  font: 600 20px/1.8 var(--display);
  color: #dce7e8;
}
.horizon-figure figcaption > p {
  font-size: 9px;
  line-height: 2;
  color: #b7c8d5;
  text-align: right;
}
.thermosphere-note {
  max-width: 710px;
  font-size: 12px;
  line-height: 2.2;
  color: #b0c3d2;
  margin: 35px 0 0 auto;
}
.orbit {
  background: #080f1b;
  --line: #3b4a5c;
  --muted: #b1c0ce;
  overflow: hidden;
}
.orbit-opening {
  display: grid;
  grid-template-columns: 1fr 1.25fr;
  align-items: center;
  gap: 9%;
}
.orbit-opening h2 {
  font-size: clamp(35px, 3.6vw, 56px);
}
.orbit-opening .intro {
  margin-top: 27px;
}
.orbit-opening .body-copy {
  max-width: 375px;
}
.station-figure {
  margin-right: calc(var(--gutter) * -0.5);
}
.station-figure img {
  mix-blend-mode: lighten;
}
.station-figure figcaption {
  padding-top: 18px;
  color: #aabdc9;
  font-size: 9px;
}
.station-figure figcaption > a {
  margin-left: 16px;
}
.orbit-experiment {
  border-top: 1px solid var(--line);
  margin-top: 95px;
  padding-top: 40px;
}
.experiment-top {
  display: flex;
  justify-content: space-between;
  align-items: center;
  gap: 30px;
}
.experiment-top > .eyebrow {
  color: #c9b388;
  font-size: 9px;
}
.experiment-top h3 {
  font: 600 28px/1.8 var(--display);
}
.orbit-lab {
  display: grid;
  grid-template-columns: 1.3fr 0.8fr;
  gap: 10%;
  align-items: center;
  margin-top: 22px;
}
.orbit-figure svg {
  display: block;
  width: 100%;
}
.orbit-figure text {
  font: 10px var(--sans);
  fill: #acbdca;
}
.orbit-figure .planet-label {
  font: 600 23px var(--display);
  fill: #d8e6e8;
}
.orbit-figure figcaption {
  font-size: 9px;
  text-align: center;
  color: #aebfcd;
}
.speed-controls {
  display: flex;
  flex-direction: column;
}
.speed-controls button {
  display: flex;
  align-items: center;
  justify-content: space-between;
  font-size: 12px;
  min-height: 53px;
  border-bottom: 1px solid #526173;
  text-align: left;
  padding: 7px 0;
  gap: 20px;
}
.speed-controls button > span {
  font-size: 11px;
  color: #aabac8;
  white-space: nowrap;
}
.speed-controls button[aria-pressed="true"] {
  color: #efd2a0;
  border-bottom-color: #d6b57d;
}
.speed-controls button[aria-pressed="true"] > span {
  color: #efd2a0;
}
.flight-story {
  margin-top: 27px;
  min-height: 145px;
}
.flight-story h4 {
  font-size: 19px;
  line-height: 1.8;
  margin-bottom: 13px;
}
.flight-story p {
  font-size: 12px;
  color: #b6c4ce;
  line-height: 2.1;
}
.time-slider {
  border-top: 1px solid #41536a;
  margin-top: 27px;
  padding-top: 21px;
}
.time-slider label {
  display: flex;
  justify-content: space-between;
  font-size: 12px;
  gap: 10px;
}
.time-slider output {
  font-size: 11px;
  color: #ddc299;
  white-space: nowrap;
}
.time-slider input {
  width: 100%;
  margin: 12px 0 4px;
  height: 28px;
  accent-color: #d5b77c;
}
.time-slider > div {
  display: flex;
  justify-content: space-between;
  align-items: center;
}
.time-slider small {
  font-size: 9px;
  color: #afc0cd;
}
.time-slider button {
  font-size: 11px;
  min-height: 38px;
  color: #e2c593;
}
.flight-status {
  font-size: 11px;
  color: #c6d4de;
  min-height: 45px;
  margin-top: 14px;
}
.model-details {
  border-top: 1px solid var(--line);
  border-bottom: 1px solid var(--line);
  margin-top: 35px;
}
.model-details summary {
  font-size: 11px;
  display: flex;
  justify-content: space-between;
  list-style: none;
  padding: 17px 0;
  align-items: center;
  min-height: 54px;
}
.model-details summary > span {
  font:
    22px Georgia,
    serif;
}
.model-details[open] summary > span {
  transform: rotate(45deg);
}
.model-details > p {
  font-size: 11px;
  line-height: 2.1;
  color: #aabfcd;
  max-width: 870px;
  padding: 5px 0 27px;
}
.homeward {
  background: radial-gradient(ellipse at 50% 125%, #294c65, #0b1525 60%) #294c65;
  text-align: center;
  padding-top: 105px !important;
  padding-bottom: 105px !important;
}
.homeward > .eyebrow {
  color: #c8b88f;
}
.homeward h2 {
  font-size: clamp(40px, 4.3vw, 67px);
  line-height: 1.7;
  margin-top: 32px;
}
.homeward-intro {
  font-size: 13px;
  line-height: 2.2;
  color: #b9c9d6;
  margin-top: 25px;
}
.journey-summary {
  display: flex;
  justify-content: space-between;
  margin-top: 75px;
  text-align: left;
  gap: 28px;
}
.journey-summary > a {
  flex: 1;
  display: flex;
  flex-direction: column;
  border-top: 1px solid #6e8291;
  padding-top: 17px;
  min-width: 0;
}
.journey-summary > a > span {
  font-size: 9px;
  color: #d3bc8e;
}
.journey-summary b {
  font: 400 17px/1.8 var(--sans);
  margin-top: 11px;
  white-space: nowrap;
}
.journey-summary small {
  font:
    13px/2 Georgia,
    serif;
  color: #aabfce;
  margin-top: 4px;
}
.summary-note {
  font-size: 9px;
  color: #adbfce;
  margin-top: 25px;
}
.return-link {
  display: inline-flex;
  gap: 48px;
  align-items: center;
  border: 1px solid #c6b180;
  color: #f0debb;
  padding: 12px 24px;
  font-size: 12px;
  border-radius: 2px;
  margin-top: 42px;
  min-height: 51px;
}
.return-link > span {
  font-size: 21px;
}
.return-link:hover {
  background: #d9bd87;
  color: #152839;
}
.sources {
  background: #e0e8e5;
  padding: 55px var(--gutter) 26px;
  --muted: #456574;
  --line: #97adaf;
}
.footer-heading {
  display: flex;
  align-items: center;
  justify-content: space-between;
  gap: 25px;
  margin-bottom: 42px;
}
.footer-heading .brand {
  font-size: 23px;
}
.footer-heading > p {
  font-size: 12px;
  letter-spacing: 0.03em;
}
.footer-heading > span {
  font-size: 10px;
}
.source-details {
  border-top: 1px solid #94a8aa;
  border-bottom: 1px solid #94a8aa;
}
.source-details summary {
  list-style: none;
  display: flex;
  align-items: center;
  justify-content: space-between;
  padding: 18px 0;
  font-size: 12px;
}
.source-details summary > span {
  display: flex;
  gap: 37px;
  align-items: center;
  font-size: 10px;
}
.source-details summary i {
  font:
    22px Georgia,
    serif;
}
.source-details[open] summary i {
  transform: rotate(45deg);
}
.sources-content {
  padding: 14px 0 35px;
}
.sources-content > p {
  font-size: 12px;
  line-height: 2.2;
  max-width: 880px;
  margin-bottom: 16px;
  color: var(--muted);
}
.source-list {
  display: grid;
  grid-template-columns: 1fr 1fr;
  gap: 28px 60px;
  margin: 35px 0;
  padding-left: 22px;
  font-size: 11px;
}
.source-list li {
  padding-left: 4px;
  scroll-margin-top: 105px;
}
.source-list li:target {
  background: #c4d6d8;
  outline: 7px solid #c4d6d8;
}
.source-list a {
  border-bottom: 1px solid #809aa1;
  padding-bottom: 2px;
}
.source-list p {
  font-size: 10px;
  line-height: 2;
  color: #4b6872;
  margin-top: 7px;
}
.asset-links {
  display: flex;
  gap: 25px;
  flex-wrap: wrap;
  font-size: 10px;
}
.asset-links > span {
  margin-left: auto;
}
.footer-bottom {
  display: flex;
  align-items: center;
  justify-content: space-between;
  gap: 25px;
  padding-top: 24px;
  font-size: 10px;
}
.footer-bottom nav {
  display: flex;
  gap: 30px;
}
.no-script {
  padding: 18px var(--gutter);
  font-size: 12px;
  background: #c6d9df;
  color: #203d48;
}
.reduced-motion *,
.reduced-motion *:before,
.reduced-motion *:after {
  animation: none !important;
  transition: none !important;
}
.reduced-motion .parallax {
  transform: none !important;
}
html:has(.reduced-motion) {
  scroll-behavior: auto;
}
@media (min-width: 1800px) {
  :root {
    --gutter: max(110px, calc((100vw - 1530px) / 2));
  }
}
@media (max-width: 1100px) {
  .hero h1 {
    font-size: 92px;
  }
  .hero-description {
    gap: 25px;
  }
  .hero-copy {
    padding-top: 190px;
  }
  .edition {
    display: none;
  }
  .altitude-nav {
    gap: 25px;
  }
  .altitude-nav nav {
    gap: 27px;
  }
  .altitude-readout {
    min-width: 145px;
    gap: 14px;
  }
  .atlas-link {
    display: none;
  }
  .split-heading {
    gap: 8%;
    grid-template-columns: 1.2fr 1fr;
  }
  .balloon-exhibit {
    gap: 5%;
    grid-template-columns: 1.1fr 1fr;
  }
  .balloon-copy h2 {
    font-size: 36px;
  }
  .balloon-frame {
    aspect-ratio: 1/1.6;
  }
  .scatter-exhibit {
    gap: 5%;
    grid-template-columns: 1fr 1.4fr;
  }
  .orbit-opening {
    gap: 6%;
    grid-template-columns: 1fr 1fr;
  }
  .orbit-opening h2 {
    font-size: 39px;
  }
  .orbit-lab {
    gap: 5%;
    grid-template-columns: 1.15fr 1fr;
  }
  .experiment-top h3 {
    font-size: 24px;
  }
  .flight-story h4 {
    font-size: 17px;
  }
  .homeward h2 {
    font-size: 52px;
  }
  .journey-summary {
    gap: 18px;
  }
  .journey-summary b {
    font-size: 15px;
  }
  .section-top .eyebrow > span {
    margin-left: 12px;
    font-size: 8px;
  }
}
@media (max-width: 760px) {
  :root {
    --gutter: 25px;
  }
  html {
    scroll-padding-top: 84px;
  }
  .site-header {
    height: 90px;
  }
  .brand {
    font-size: 23px;
    gap: 11px;
  }
  .brand svg {
    width: 30px;
    height: 30px;
  }
  .brand small {
    font-size: 7px;
    margin-top: 4px;
  }
  .site-header nav {
    gap: 18px;
  }
  .site-header nav > a {
    font-size: 10px;
  }
  .site-header button {
    padding: 0;
    border: 0;
    font-size: 10px;
    gap: 5px;
  }
  .hero {
    min-height: 780px;
    height: 100svh;
    max-height: 1050px;
  }
  .hero-art {
    inset: 0 -45%;
  }
  .hero-art img {
    object-position: 59% center;
  }
  .hero:after {
    background:
      linear-gradient(180deg, #e1eaedb8, transparent 60%, #112e40b3 100%),
      linear-gradient(90deg, #e1eaed73, transparent 85%);
  }
  .hero-copy {
    padding: 150px var(--gutter) 90px;
    max-width: none;
  }
  .hero-copy > .eyebrow {
    font-size: 9px;
    gap: 12px;
    letter-spacing: 0.1em;
  }
  .hero h1 {
    font-size: clamp(58px, 15vw, 84px);
    line-height: 1.42;
    margin: 32px 0 28px;
    letter-spacing: -0.025em;
  }
  .hero-description {
    display: block;
  }
  .hero-description > p {
    font-size: 12px;
    line-height: 2;
  }
  .primary-link {
    margin-top: 24px;
    font-size: 12px;
    gap: 44px;
    padding: 10px 19px;
    min-height: 48px;
  }
  .hero-bottom {
    bottom: 26px;
    gap: 20px;
    font-size: 9px;
    align-items: flex-end;
  }
  .hero-bottom p {
    gap: 11px;
    font-size: 9px;
  }
  .hero-bottom > span:nth-child(2) {
    display: none;
  }
  .hero-bottom > span:last-child {
    font-size: 8px;
    max-width: 100px;
    text-align: right;
    line-height: 1.8;
  }
  .scroll-line {
    height: 28px;
  }
  .altitude-nav {
    height: 68px;
    padding: 0 16px;
    gap: 15px;
  }
  .altitude-readout {
    display: block;
    min-width: 62px;
    line-height: 1.35;
  }
  .altitude-readout small {
    display: block;
    font-size: 7px;
  }
  .altitude-readout small span {
    display: none;
  }
  .altitude-readout b {
    font-size: 25px;
    min-width: 40px;
    text-align: left;
    line-height: 1.35;
  }
  .altitude-readout i {
    font-size: 8px;
  }
  .altitude-readout > span > span {
    display: none;
  }
  .altitude-nav nav {
    justify-content: space-between;
    flex: 1;
    gap: 12px;
  }
  .altitude-nav nav a {
    font-size: 10px;
    gap: 0;
    flex-direction: column;
    justify-content: center;
    line-height: 1.8;
  }
  .altitude-nav nav a > span {
    font-size: 7px;
  }
  .scene:not(.hero) {
    padding: 42px var(--gutter) 48px;
  }
  .section-top {
    gap: 12px;
    margin-bottom: 36px;
    padding-bottom: 17px;
    align-items: flex-start;
  }
  .section-top .eyebrow {
    font-size: 9px;
    letter-spacing: 0.07em;
  }
  .section-top .eyebrow > span {
    display: block;
    font-size: 7px;
    margin: 5px 0 0;
    letter-spacing: 0.12em;
  }
  .height-range {
    font-size: 19px;
    text-align: right;
    line-height: 1.3;
  }
  .height-range > span {
    display: block;
    font-size: 8px;
    line-height: 1.7;
    margin: 6px 0 0;
  }
  .split-heading {
    display: block;
  }
  .split-heading h2 {
    font-size: 35px;
    line-height: 1.7;
  }
  .split-heading > div {
    max-width: 100%;
    margin-top: 25px;
  }
  .intro {
    font-size: 13px;
    line-height: 2.1;
  }
  .body-copy {
    font-size: 12px;
    margin-top: 20px;
    line-height: 2.1;
  }
  .scatter-exhibit {
    display: flex;
    flex-direction: column;
    margin-top: 36px;
    padding-top: 28px;
    gap: 20px;
    align-items: stretch;
  }
  .scatter-caption > .eyebrow {
    font-size: 9px;
  }
  .scatter-caption h3 {
    font-size: 25px;
    margin: 17px 0 13px;
  }
  .scatter-caption > p:nth-of-type(2) {
    font-size: 12px;
    max-width: 100%;
  }
  .scatter-caption .line-button {
    margin-top: 17px;
  }
  .scatter-caption small {
    font-size: 9px;
    margin-top: 13px;
  }
  .scatter-figure {
    margin: 4px -12px 0;
  }
  .scatter-figure text {
    font-size: 19px;
  }
  .scatter-figure text:last-child {
    font-size: 15px;
  }
  .stratosphere {
    padding-bottom: 100px !important;
  }
  .balloon-exhibit {
    display: flex;
    flex-direction: column;
    gap: 30px;
  }
  .balloon-copy {
    width: 100%;
  }
  .overline {
    font-size: 10px;
    margin-bottom: 22px;
    line-height: 2;
  }
  .balloon-copy h2 {
    font-size: 34px;
    line-height: 1.7;
  }
  .balloon-copy .intro {
    margin-top: 21px;
  }
  .balloon-copy > .body-copy {
    max-width: 100%;
  }
  .instrument-panel {
    width: 100%;
  }
  .instrument-controls {
    gap: 25px;
    margin-top: 0;
  }
  .instrument-controls button {
    font-size: 12px;
    min-height: 44px;
  }
  .instrument-story {
    min-height: 155px;
    margin-top: 24px;
    max-width: 100%;
  }
  .instrument-story h3 {
    font-size: 17px;
  }
  .instrument-story > p:last-child {
    font-size: 11px;
    line-height: 2;
  }
  .balloon-frame {
    width: 100%;
    aspect-ratio: 1/1.2;
    max-height: 530px;
  }
  .balloon-figure {
    width: 100%;
    max-width: 440px;
    align-self: center;
  }
  .part-marker {
    width: 30px;
    height: 30px;
    font-size: 10px;
  }
  .part-marker:before {
    width: 17px;
  }
  .balloon-figure figcaption {
    font-size: 8px;
    margin-top: 13px;
  }
  .size-details {
    margin-top: 35px;
  }
  .size-details summary {
    font-size: 12px;
    padding: 18px 0;
  }
  .size-details summary small {
    display: block;
    font-size: 9px;
    margin: 5px 0 0;
  }
  .size-content {
    padding: 5px 0 25px;
  }
  .size-content > p:first-child {
    font-size: 11px;
  }
  .size-content svg {
    margin: 24px 0 14px;
  }
  .size-content svg text {
    font-size: 35px;
  }
  .size-content svg text:nth-of-type(n + 4) {
    font-size: 23px;
  }
  #size-diagram text:last-of-type {
    font-size: 35px;
  }
  .size-content .figure-note {
    font-size: 9px;
  }
  .mesosphere .split-heading h2 {
    font-size: 33px;
  }
  .night-figure {
    margin-top: 33px;
  }
  .night-frame {
    height: 440px;
  }
  .night-frame img {
    object-position: 63% center;
  }
  .night-annotations > span {
    font-size: 9px;
    padding: 7px 10px;
  }
  .cloud-annotation {
    left: 30%;
    top: 44%;
  }
  .ground-annotation {
    left: 8%;
    bottom: 10%;
  }
  .night-figure figcaption {
    display: flex;
    flex-direction: column;
    align-items: flex-start;
    gap: 18px;
    padding: 18px var(--gutter);
    font-size: 8px;
  }
  .night-figure .line-button {
    font-size: 11px;
    min-width: 180px;
  }
  .transition-note {
    margin-top: 24px;
    padding-top: 22px;
    font-size: 10px;
    line-height: 2;
  }
  .transition-note > span {
    display: block;
    margin: 0 0 7px;
  }
  .threshold-intro {
    font-size: 11px;
    letter-spacing: 0.02em;
    margin: 15px 0 0;
  }
  .karman {
    padding-top: 50px;
  }
  .karman-number {
    font-size: clamp(145px, 44vw, 220px);
  }
  .karman-number > span {
    font-size: 11px;
    right: -25px;
    bottom: 20%;
  }
  .karman-line {
    gap: 13px;
    margin: 25px -5px 35px;
  }
  .karman-line i {
    width: 15%;
  }
  .karman-line > span {
    font-size: 8px;
    letter-spacing: 0.1em;
  }
  .karman h2 {
    font-size: 31px;
    line-height: 1.8;
  }
  .karman > p:last-child {
    font-size: 11px;
    line-height: 2.2;
    margin-top: 20px;
  }
  .karman > p:last-child br {
    display: none;
  }
  .horizon-figure {
    margin: 42px calc(var(--gutter) * -1) 0;
  }
  .horizon-figure img {
    height: 330px;
    object-position: 46% center;
  }
  .horizon-figure figcaption {
    display: block;
    padding: 20px var(--gutter);
    border: 0;
  }
  .horizon-figure figcaption > span {
    font-size: 20px;
  }
  .horizon-figure figcaption > p {
    text-align: left;
    font-size: 9px;
    margin-top: 13px;
  }
  .thermosphere-note {
    font-size: 11px;
    line-height: 2.2;
    margin-top: 16px;
    padding-top: 23px;
    border-top: 1px solid var(--line);
  }
  .orbit-opening {
    display: flex;
    flex-direction: column;
    gap: 30px;
  }
  .orbit-opening > div {
    width: 100%;
  }
  .orbit-opening h2 {
    font-size: 37px;
    line-height: 1.7;
  }
  .orbit-opening .intro {
    margin-top: 23px;
  }
  .orbit-opening .body-copy {
    max-width: 100%;
  }
  .station-figure {
    margin: 0;
    width: calc(100% + 30px);
    align-self: center;
  }
  .station-figure figcaption {
    font-size: 8px;
    padding: 13px 15px 0;
  }
  .orbit-experiment {
    margin-top: 42px;
    padding-top: 28px;
  }
  .experiment-top {
    display: block;
  }
  .experiment-top > .eyebrow {
    font-size: 8px;
    letter-spacing: 0.1em;
  }
  .experiment-top h3 {
    font-size: 24px;
    line-height: 1.8;
    margin-top: 17px;
  }
  .orbit-lab {
    display: flex;
    flex-direction: column;
    margin-top: 15px;
    gap: 27px;
  }
  .orbit-figure {
    width: 100%;
    margin: 0;
  }
  .orbit-figure svg text {
    font-size: 20px;
  }
  .orbit-figure .planet-label {
    font-size: 28px;
  }
  .orbit-figure svg text:nth-of-type(2) {
    font-size: 14px;
  }
  .orbit-figure svg text:last-of-type {
    font-size: 13px;
  }
  .orbit-figure figcaption {
    font-size: 9px;
  }
  .flight-controls {
    width: 100%;
  }
  .speed-controls button {
    font-size: 12px;
    min-height: 54px;
  }
  .speed-controls button > span {
    font-size: 11px;
  }
  .flight-story {
    min-height: 0;
    margin-top: 27px;
  }
  .flight-story h4 {
    font-size: 18px;
  }
  .flight-story p {
    font-size: 12px;
  }
  .time-slider {
    margin-top: 24px;
    padding-top: 20px;
  }
  .flight-status {
    font-size: 10px;
    min-height: 35px;
    margin-top: 16px;
  }
  .model-details {
    margin-top: 27px;
  }
  .model-details summary {
    font-size: 11px;
    min-height: 54px;
  }
  .model-details > p {
    font-size: 10px;
  }
  .homeward {
    padding-top: 65px !important;
    padding-bottom: 65px !important;
  }
  .homeward > .eyebrow {
    font-size: 9px;
  }
  .homeward h2 {
    font-size: 35px;
    line-height: 1.8;
    margin-top: 28px;
  }
  .homeward-intro {
    font-size: 11px;
    margin-top: 22px;
  }
  .journey-summary {
    display: flex;
    flex-direction: column;
    gap: 0;
    margin-top: 35px;
  }
  .journey-summary > a {
    display: flex;
    flex-direction: row;
    align-items: center;
    gap: 21px;
    padding: 16px 0;
  }
  .journey-summary > a > span {
    font-size: 9px;
  }
  .journey-summary b {
    font-size: 14px;
    margin: 0;
  }
  .journey-summary small {
    margin: 0 0 0 auto;
    font-size: 12px;
    white-space: nowrap;
  }
  .summary-note {
    font-size: 9px;
    line-height: 2;
    text-align: left;
    margin-top: 18px;
  }
  .return-link {
    font-size: 11px;
    gap: 34px;
    margin-top: 31px;
    padding: 10px 20px;
  }
  .sources {
    padding: 38px var(--gutter) 24px;
  }
  .footer-heading {
    margin-bottom: 30px;
  }
  .footer-heading .brand {
    font-size: 23px;
  }
  .footer-heading > p {
    display: none;
  }
  .footer-heading > span {
    font-size: 9px;
  }
  .source-details summary {
    font-size: 11px;
    padding: 17px 0;
  }
  .source-details summary > span {
    font-size: 9px;
    gap: 15px;
  }
  .sources-content {
    padding: 10px 0 25px;
  }
  .sources-content > p {
    font-size: 11px;
    line-height: 2.1;
  }
  .source-list {
    grid-template-columns: 1fr;
    gap: 25px;
    margin: 30px 0;
    font-size: 11px;
    padding-left: 20px;
  }
  .source-list p {
    font-size: 10px;
  }
  .asset-links {
    gap: 18px;
    font-size: 9px;
  }
  .asset-links > span {
    width: 100%;
    margin: 0;
  }
  .footer-bottom {
    font-size: 9px;
    gap: 17px;
    flex-wrap: wrap;
  }
  .footer-bottom nav {
    gap: 23px;
  }
  .footer-bottom > a {
    margin-left: auto;
  }
  .footer-bottom > span {
    display: none;
  }
}
@media (max-width: 375px) {
  :root {
    --gutter: 22px;
  }
  .site-header nav > a {
    display: none;
  }
  .hero-copy {
    padding-top: 138px;
  }
  .hero h1 {
    font-size: 53px;
  }
  .hero {
    min-height: 750px;
  }
  .altitude-nav {
    padding: 0 12px;
    gap: 8px;
  }
  .altitude-readout {
    min-width: 55px;
  }
  .altitude-readout b {
    font-size: 23px;
    min-width: 38px;
  }
  .altitude-nav nav {
    gap: 9px;
  }
  .altitude-nav nav a {
    font-size: 9px;
  }
  .altitude-nav nav a > span {
    font-size: 7px;
  }
  .split-heading h2,
  .balloon-copy h2 {
    font-size: 31px;
  }
  .mesosphere .split-heading h2 {
    font-size: 30px;
  }
  .karman h2 {
    font-size: 29px;
  }
  .orbit-opening h2 {
    font-size: 34px;
  }
  .homeward h2 {
    font-size: 31px;
  }
  .experiment-top h3 {
    font-size: 22px;
  }
  .instrument-controls {
    gap: 19px;
  }
}
@media (prefers-reduced-motion: reduce) {
  html {
    scroll-behavior: auto;
  }
  *,
  *:before,
  *:after {
    animation: none !important;
    transition: none !important;
  }
  .parallax {
    transform: none !important;
  }
}