:root {
  color-scheme: dark;
  --bg: #100b20;
  --panel: #1a1429;
  --line: #3b3050;
  --text: #f6f0fc;
  --muted: #bbb0cd;
  --purple: #d3afff;
  --mint: #b3e5d3;
  --gold: #f0cf9c;
  font-family: Inter, ui-sans-serif, system-ui, sans-serif;
}
* {
  box-sizing: border-box;
}
html {
  scroll-behavior: smooth;
  scroll-padding-top: 30px;
}
body {
  margin: 0;
  background: radial-gradient(ellipse at 85% 8%, #38204d66, transparent 35%),
    var(--bg);
  color: var(--text);
  line-height: 1.6;
}
a {
  color: var(--purple);
  text-decoration: none;
}
a:hover {
  text-decoration: underline;
}
button,
input {
  font: inherit;
}
button,
a,
input,
summary {
  -webkit-tap-highlight-color: transparent;
}
button,
summary {
  cursor: pointer;
}
button {
  color: inherit;
}
button:focus-visible,
a:focus-visible,
input:focus-visible,
summary:focus-visible {
  outline: 3px solid var(--mint);
  outline-offset: 4px;
}
header,
main,
footer {
  width: min(1260px, calc(100% - 80px));
  margin: auto;
}
header {
  min-height: 94px;
  display: flex;
  align-items: center;
  gap: 30px;
  border-bottom: 1px solid var(--line);
}
.brand {
  font-size: 21px;
  letter-spacing: 2px;
  color: var(--text);
  white-space: nowrap;
}
nav {
  display: flex;
  gap: 26px;
  margin-left: auto;
  font-size: 13px;
}
nav a {
  color: var(--muted);
}
.mode {
  font-size: 10px;
  letter-spacing: 1.4px;
  border: 1px solid #6b547b;
  padding: 7px 10px;
  border-radius: 50px;
  color: var(--mint);
}
.hero {
  display: grid;
  grid-template-columns: 1.25fr 1fr;
  align-items: center;
  min-height: 580px;
  gap: 25px;
  padding: 65px 0;
}
.eyebrow {
  font-size: 11px;
  font-weight: 650;
  letter-spacing: 2.5px;
  color: var(--purple);
  margin: 0 0 20px;
}
h1 {
  font-size: clamp(42px, 4.6vw, 66px);
  line-height: 1.08;
  letter-spacing: -3px;
  margin: 0 0 28px;
  font-weight: 520;
}
h1 em {
  font-style: normal;
  color: var(--purple);
}
.intro {
  font-size: 16px;
  max-width: 570px;
  color: var(--muted);
}
.actions {
  display: flex;
  gap: 22px;
  align-items: center;
  margin: 30px 0 17px;
}
.button {
  display: inline-flex;
  align-items: center;
  justify-content: center;
  gap: 28px;
  padding: 13px 20px;
  border: 1px solid var(--purple);
  border-radius: 8px;
  background: var(--purple);
  color: #201130;
  font-weight: 650;
  font-size: 13px;
  text-decoration: none;
}
.button:hover {
  background: #e2caff;
  text-decoration: none;
}
.button:disabled,
.secondary:disabled {
  opacity: 0.5;
  cursor: not-allowed;
}
.secondary {
  display: inline-block;
  background: none;
  border: none;
  color: var(--purple);
  font-size: 13px;
  padding: 10px 0;
}
.scope,
.small {
  font-size: 12px;
  color: var(--muted);
}
.cosmos {
  height: 400px;
  position: relative;
  background: radial-gradient(circle, #a667de25, transparent 60%);
  isolation: isolate;
}
.orbit {
  position: absolute;
  left: 50%;
  top: 50%;
  border: 1px solid #ac84ce66;
  border-radius: 50%;
  width: 92%;
  height: 48%;
  transform: translate(-50%, -50%) rotate(-25deg);
}
.o2 {
  width: 63%;
  height: 78%;
  transform: translate(-50%, -50%) rotate(35deg);
  border-color: #d9bb8955;
}
.o3 {
  width: 47%;
  height: 93%;
  transform: translate(-50%, -50%) rotate(-30deg);
  border-color: #ac84ce33;
}
.sun {
  position: absolute;
  left: 50%;
  top: 50%;
  transform: translate(-50%, -50%);
  width: 130px;
  height: 130px;
  border-radius: 50%;
  border: 1px solid #f0cf9c99;
  display: grid;
  place-items: center;
  font-size: 83px;
  color: #f6d6a7;
  background: radial-gradient(circle at 38% 30%, #b885c0, #382446 60%, #151025);
  box-shadow: 0 0 80px #be85de30;
}
.satellite {
  position: absolute;
  font-size: 9px;
  letter-spacing: 1.3px;
  background: #1c132e;
  border: 1px solid #715786;
  border-radius: 30px;
  padding: 7px 12px;
}
.s1 {
  left: 4%;
  top: 53%;
}
.s2 {
  right: 0;
  top: 20%;
}
.s3 {
  right: 9%;
  bottom: 14%;
}
.s4 {
  left: 15%;
  top: 8%;
}
.orbital-caption {
  position: absolute;
  bottom: 0;
  left: 0;
  right: 0;
  text-align: center;
  color: var(--muted);
  font-size: 10px;
  letter-spacing: 3px;
}
.facts {
  border-top: 1px solid var(--line);
  border-bottom: 1px solid var(--line);
  padding: 27px 0;
  display: grid;
  grid-template-columns: repeat(4, 1fr);
  gap: 20px;
}
.facts div {
  display: flex;
  flex-direction: column;
}
.facts b {
  font-size: 26px;
  font-weight: 550;
}
.facts span {
  font-size: 12px;
  color: var(--muted);
}
section:not(.hero) {
  padding: 78px 0 0;
}
.section-head {
  display: flex;
  justify-content: space-between;
  align-items: end;
  gap: 30px;
  margin-bottom: 30px;
}
.section-head .eyebrow {
  margin-bottom: 12px;
}
h2 {
  font-size: clamp(28px, 3vw, 38px);
  letter-spacing: -1.4px;
  line-height: 1.2;
  margin: 0;
  font-weight: 520;
}
.section-head > p {
  font-size: 13px;
  color: var(--muted);
}
.mission-layout {
  display: grid;
  grid-template-columns: 1fr 1fr;
  gap: 24px;
}
.task-grid {
  display: grid;
  grid-template-columns: 1fr 1fr;
  gap: 10px;
  align-content: start;
}
.task {
  background: #181224;
  border: 1px solid var(--line);
  border-radius: 9px;
  padding: 17px;
  text-align: left;
  line-height: 1.5;
  min-height: 89px;
}
.task span {
  display: block;
  font-size: 10px;
  color: var(--muted);
  margin-bottom: 6px;
}
.task strong {
  font-size: 13px;
  font-weight: 550;
}
.task[aria-pressed='true'] {
  background: #322144;
  border-color: var(--purple);
}
.task:hover {
  border-color: #9071ac;
}
.brief {
  background: linear-gradient(125deg, #261c36, #191322);
  border: 1px solid #655078;
  border-radius: 12px;
  padding: 30px;
}
h3 {
  font-size: 22px;
  font-weight: 520;
  line-height: 1.3;
  margin: 0 0 18px;
}
h4 {
  font-size: 12px;
  letter-spacing: 0.7px;
  margin: 24px 0 10px;
}
.brief > p,
.brief li {
  font-size: 13px;
  color: var(--muted);
}
ul {
  padding-left: 20px;
}
.brief .button {
  margin-top: 15px;
}
.presets {
  display: flex;
  gap: 10px;
  margin: 24px 0;
}
.presets button {
  background: none;
  border: 1px solid var(--line);
  padding: 8px 15px;
  border-radius: 30px;
  font-size: 12px;
}
.presets button[aria-pressed='true'] {
  border-color: var(--mint);
  color: var(--mint);
  background: #b3e5d310;
}
.planner {
  display: grid;
  grid-template-columns: 1.1fr 1fr;
  gap: 24px;
}
form,
.results {
  background: var(--panel);
  border: 1px solid var(--line);
  padding: 30px;
  border-radius: 12px;
}
.field-grid {
  display: grid;
  grid-template-columns: 1fr 1fr;
  gap: 19px;
}
label {
  display: flex;
  flex-direction: column;
  gap: 7px;
  font-size: 12px;
  color: var(--muted);
}
input {
  width: 100%;
  min-width: 0;
  background: #100d19;
  color: var(--text);
  border: 1px solid #655373;
  border-radius: 7px;
  padding: 9px 12px;
}
input:invalid {
  border-color: #ffbdaf;
}
.headline {
  display: flex;
  gap: 20px;
  align-items: center;
  margin-bottom: 20px;
}
.headline strong {
  font-size: 64px;
  font-weight: 450;
  line-height: 1;
  color: var(--mint);
}
.headline span {
  font-size: 13px;
  max-width: 100px;
  color: var(--muted);
}
#constraint {
  color: var(--gold);
  font-size: 13px;
}
.bar {
  display: grid;
  grid-template-columns: 70px 1fr 45px;
  align-items: center;
  gap: 12px;
  margin: 12px 0;
  font-size: 11px;
  color: var(--muted);
}
.track {
  height: 5px;
  background: #473953;
  border-radius: 5px;
  overflow: hidden;
}
.fill {
  height: 100%;
  background: var(--purple);
}
.bar b {
  text-align: right;
  font-size: 11px;
  color: var(--text);
}
dl {
  margin: 25px 0;
}
dl div {
  display: flex;
  justify-content: space-between;
  gap: 15px;
  border-top: 1px solid var(--line);
  padding: 9px 0;
  font-size: 12px;
}
dt {
  color: var(--muted);
}
dd {
  margin: 0;
  text-align: right;
}
#error {
  color: #ffd0bc;
  font-size: 12px;
}
.results > .secondary {
  display: block;
}
details {
  padding: 20px 0;
  border-bottom: 1px solid var(--line);
  font-size: 13px;
  color: var(--muted);
}
summary {
  color: var(--purple);
}
.evidence-grid {
  display: grid;
  grid-template-columns: repeat(4, 1fr);
  gap: 15px;
}
.evidence-grid article {
  padding: 25px 20px;
  border: 1px solid var(--line);
  border-radius: 10px;
}
.step {
  font-size: 11px;
  color: var(--gold);
}
.evidence-grid h3 {
  font-size: 17px;
  margin: 25px 0 15px;
}
.evidence-grid p,
.boundary p {
  font-size: 13px;
  color: var(--muted);
}
.boundary {
  margin-top: 24px;
  display: grid;
  grid-template-columns: 1.4fr 1fr;
  gap: 60px;
  padding: 30px;
  background: #b78aff08;
  border: 1px solid var(--line);
  border-radius: 10px;
}
.boundary h3 {
  font-size: 19px;
}
.boundary a {
  display: block;
  font-size: 12px;
  margin: 10px 0;
}
.vision {
  text-align: center;
  max-width: 720px;
  margin: auto;
}
.vision h2 {
  font-size: 40px;
}
.vision > p:not(.eyebrow) {
  color: var(--muted);
  font-size: 14px;
  line-height: 1.8;
  margin-top: 25px;
}
footer {
  margin-top: 80px;
  border-top: 1px solid var(--line);
  padding: 28px 0 40px;
  display: flex;
  align-items: center;
  justify-content: space-between;
  gap: 25px;
}
footer p {
  font-size: 11px;
  color: var(--muted);
}
#status {
  font-size: 11px;
  color: var(--mint);
}
.skip {
  position: absolute;
  top: -80px;
  background: var(--bg);
  padding: 10px;
  z-index: 10;
}
.skip:focus {
  top: 10px;
}
@media (max-width: 1000px) {
  header,
  main,
  footer {
    width: calc(100% - 40px);
  }
  nav {
    gap: 15px;
    font-size: 11px;
  }
  .mode {
    display: none;
  }
  .hero {
    grid-template-columns: 1.25fr 1fr;
    min-height: 500px;
  }
  .cosmos {
    height: 340px;
  }
  .actions {
    flex-wrap: wrap;
    gap: 7px;
  }
  .evidence-grid {
    grid-template-columns: 1fr 1fr;
  }
}
@media (max-width: 700px) {
  header {
    flex-wrap: wrap;
    padding: 20px 0;
    gap: 10px;
  }
  nav {
    width: 100%;
    margin: 0;
    justify-content: space-between;
    flex-wrap: wrap;
  }
  .hero {
    grid-template-columns: 1fr;
    padding: 48px 0 30px;
    gap: 15px;
  }
  h1 {
    letter-spacing: -2px;
  }
  .cosmos {
    height: 280px;
    max-width: 440px;
    width: 100%;
    margin: auto;
  }
  .intro {
    font-size: 14px;
  }
  .facts {
    grid-template-columns: 1fr 1fr;
    row-gap: 20px;
  }
  .section-head {
    display: block;
  }
  .mission-layout,
  .planner,
  .boundary {
    grid-template-columns: 1fr;
  }
  .brief,
  form,
  .results {
    padding: 24px;
  }
  .presets {
    flex-wrap: wrap;
  }
  .section-head > p {
    margin-top: 18px;
  }
  section:not(.hero) {
    padding-top: 52px;
  }
  .boundary {
    gap: 20px;
  }
  .vision h2 {
    font-size: 31px;
  }
  footer {
    align-items: start;
    flex-direction: column;
  }
  footer p {
    margin: 0;
  }
}
@media (prefers-reduced-motion: reduce) {
  html {
    scroll-behavior: auto;
  }
}