:root { 
  color-scheme: dark;
  --sky: #070e1b;
  --panel: #0d182bdf;
  --border: #b1d4ff25;
  --text: #eaf3fc;
  --muted: #a2b5ca;
  --accent: #b5eedc;
  --cyan: #99daff;
  --radius: 24px;
}
* {
  box-sizing: border-box;
}
html {
  scroll-behavior: smooth;
}
body {
  margin: 0;
  min-width: 280px;
  min-height: 100vh;
  padding: 0 28px 170px;
  background: var(--sky);
  color: var(--text);
  font-family: "Avenir Next", "Segoe UI", Arial, sans-serif;
  font-size: 15px;
  line-height: 1.6;
  isolation: isolate;
}
[hidden] {
  display: none !important;
}
button,
input,
select {
  font: inherit;
}
button,
select,
input[type="color"] {
  cursor: pointer;
}
button,
.button-link {
  min-height: 44px;
  padding: 10px 16px;
  border: 1px solid var(--border);
  border-radius: 12px;
  background: #17253b;
  color: var(--text);
  transition:
    background 160ms ease,
    border-color 160ms ease;
}
button:hover {
  background: #22364f;
  border-color: #99daff80;
}
button:disabled,
input:disabled,
select:disabled {
  cursor: default;
  opacity: 0.5;
}
:where(button, input, select, a, summary, [role="button"]):focus-visible {
  outline: 2px solid var(--cyan);
  outline-offset: 4px;
}
a {
  color: var(--cyan);
  text-underline-offset: 4px;
}
h1,
h2,
h3,
p {
  margin-top: 0;
}
h2,
h3 {
  font-family: "Space Grotesk", "Segoe UI", Arial, sans-serif;
  line-height: 1.2;
  font-weight: 500;
}
main,
.site-header,
.site-footer {
  width: min(1180px, 100%);
  margin-inline: auto;
}
main:focus {
  outline: none;
}
.panel {
  position: relative;
  z-index: 3;
  border: 1px solid var(--border);
  border-radius: var(--radius);
  background: var(--panel);
}
.eyebrow {
  margin: 0 0 10px;
  color: var(--accent);
  font-size: 10px;
  font-weight: 600;
  letter-spacing: 0.18em;
  line-height: 1.5;
}
.skip-link {
  position: fixed;
  top: 12px;
  left: 12px;
  z-index: 30;
  padding: 12px;
  background: #142b3f;
  transform: translateY(-180%);
  border-radius: 8px;
}
.skip-link:focus {
  transform: translateY(0);
}
.visually-hidden {
  position: absolute;
  width: 1px;
  height: 1px;
  padding: 0;
  margin: -1px;
  overflow: hidden;
  clip-path: inset(50%);
  white-space: nowrap;
  border: 0;
}
.site-header {
  display: flex;
  justify-content: space-between;
  align-items: center;
  gap: 20px;
  padding: 24px 0;
  border-bottom: 1px solid var(--border);
}
.brand {
  display: inline-flex;
  align-items: center;
  gap: 12px;
  color: var(--text);
  text-decoration: none;
  font-size: 12px;
  font-weight: 600;
  letter-spacing: 0.16em;
}
.brand svg {
  width: 36px;
  height: 36px;
  fill: none;
  stroke: var(--accent);
  stroke-width: 1.2;
}
.brand svg circle {
  fill: #b5eedc15;
}
.quiet-link {
  font-size: 12px;
  text-decoration: none;
  color: var(--muted);
  white-space: nowrap;
}
.hero {
  padding: 46px 0 36px;
}
.hero h1 {
  font-family: "Space Grotesk", "Segoe UI", Arial, sans-serif;
  margin: 0 0 12px;
  font-size: clamp(2.8rem, 6.5vw, 5.7rem);
  line-height: 1.06;
  font-weight: 300;
  letter-spacing: -0.05em;
}
.title-dot {
  color: var(--accent);
}
.hero > p:last-child {
  color: var(--muted);
  font-size: 15px;
  margin-bottom: 0;
}
.home-grid {
  display: grid;
  grid-template-columns: minmax(0, 1.8fr) minmax(270px, 1fr);
  gap: 24px;
  align-items: start;
}
.system-stage {
  overflow: hidden;
  padding: 26px;
  background:
    radial-gradient(ellipse at 50% 45%, #24334b39, transparent 65%), #0b1527b8;
}
.stage-header {
  display: flex;
  justify-content: space-between;
  align-items: start;
  gap: 12px;
}
.stage-header h2 {
  font-size: 19px;
  margin-bottom: 0;
}
.button-small {
  font-size: 12px;
  padding: 9px 12px;
  white-space: nowrap;
}
.button-small[aria-pressed="true"] {
  background: #b5eedc;
  color: #092219;
  border-color: #b5eedc;
}
.mission-list-heading {
  padding: 8px 4px 16px;
}
.mission-list-heading h2 {
  font-size: 25px;
  margin-bottom: 0;
}
.mission-list {
  display: grid;
  gap: 14px;
}
.mission-card {
  padding: 23px;
}
.mission-number {
  color: #9caec6;
  font-size: 10px;
  letter-spacing: 0.13em;
  margin-bottom: 14px;
}
.mission-card h3 {
  font-size: 22px;
  margin-bottom: 10px;
  letter-spacing: -0.025em;
}
.mission-card > p:not(.mission-number) {
  font-size: 13px;
  color: var(--muted);
  line-height: 1.7;
  margin-bottom: 18px;
}
.earth-card {
  background: linear-gradient(130deg, #12313d65, transparent), var(--panel);
}
.deep-card {
  background: linear-gradient(130deg, #39235950, transparent), var(--panel);
}
.mission-footnote {
  font-size: 12px;
  color: var(--accent);
}
.text-button {
  padding: 4px 0;
  border: 0;
  border-radius: 4px;
  background: transparent;
  color: var(--accent);
  font-size: 13px;
}
.text-button:hover {
  background: transparent;
  color: white;
}
.text-button span {
  margin-left: 8px;
}
#planet-selection {
  text-align: center;
  margin-top: 100px;
}
.explorer-prompt {
  font-size: 17px;
  margin-bottom: 8px;
}
.explorer-tip {
  color: var(--muted);
  font-size: 12px;
  line-height: 1.7;
}
.system-legend {
  display: flex;
  justify-content: center;
  flex-wrap: wrap;
  gap: 10px 18px;
  margin-top: 24px;
  color: var(--muted);
  font-size: 11px;
}
.system-legend > span {
  display: flex;
  align-items: center;
  gap: 7px;
  min-width: 0;
}
.system-legend span[data-world-label] {
  overflow-wrap: anywhere;
}
.legend-dot {
  width: 6px;
  height: 6px;
  border-radius: 50%;
  background: #a283ff;
  flex-shrink: 0;
}
.ember-dot {
  background: #ffac6d;
}
.frost-dot {
  background: #83d9f5;
}

#star-field {
  position: fixed;
  inset: 0;
  z-index: -1;
  overflow: hidden;
  pointer-events: none;
  background:
    radial-gradient(ellipse at 10% 15%, #623a862b, transparent 48%),
    radial-gradient(ellipse at 90% 70%, #15646b29, transparent 45%), #070e1b;
}
#star-field::before {
  content: "";
  position: absolute;
  inset: -30%;
  background: radial-gradient(
    ellipse at center,
    transparent 12%,
    #9162ff17 25%,
    #46cfff12 35%,
    transparent 52%
  );
  transform: rotate(-25deg) scaleY(0.55);
  filter: blur(35px);
}
.star {
  position: absolute;
  border-radius: 50%;
  background: white;
  box-shadow: 0 0 4px #ffffff55;
  animation: twinkle 5s ease-in-out infinite;
}
.star--fading {
  background: #d8c4ff;
  animation-name: appear;
}
@keyframes twinkle {
  0%, 100% { opacity: 0.15; }
  50% { opacity: 0.9; }
}
@keyframes appear {
  0%, 25%, 100% { opacity: 0; }
  60% { opacity: 0.8; }
}
.star--sparkle::before,
.star--sparkle::after {
  content: "";
  position: absolute;
  top: 50%;
  left: 50%;
  transform: translate(-50%, -50%);
  border-radius: 50%;
  box-shadow: 0 0 5px #bce7ff;
}
.star--sparkle::before {
  width: 2px;
  height: 12px;
  background: linear-gradient(transparent, #e3faff, white, #e3faff, transparent);
}
.star--sparkle::after {
  width: 12px;
  height: 2px;
  background: linear-gradient(to right, transparent, #e3faff, white, #e3faff, transparent);
}
.shooting-star {
  position: absolute;
  left: 10%;
  top: 8%;
  width: 100px;
  height: 2px;
  border-radius: 50px;
  background: linear-gradient(90deg, transparent, #38bdf8, #dff6ff);
  filter: drop-shadow(0 0 6px #38bdf8);
  opacity: 0;
  animation: shoot 9s linear infinite;
}
@keyframes shoot {
  0%, 70% { opacity: 0; transform: translate(0, 0) rotate(35deg); }
  72% { opacity: 1; }
  85%, 100% { opacity: 0; transform: translate(60vw, 42vw) rotate(35deg); }
}
.shooting-star-bottom {
  left: auto;
  top: auto;
  right: 2%;
  bottom: 10%;
  animation: shoot-from-bottom 13s linear infinite;
}
@keyframes shoot-from-bottom {
  0%, 55% { opacity: 0; transform: translate(0, 0) rotate(215deg); }
  57% { opacity: 1; }
  80%, 100% { opacity: 0; transform: translate(-60vw, -42vw) rotate(215deg); }
}

.solar-system {
  position: relative;
  width: min(360px, calc(100% - 120px));
  aspect-ratio: 1;
  margin: 95px auto 0;
}
.sun {
  position: absolute;
  width: 60px;
  height: 60px;
  top: 50%;
  left: 50%;
  transform: translate(-50%, -50%);
  border-radius: 50%;
  background: radial-gradient(
    circle at 30% 25%,
    #fffbd1 0%, #ffcf56 35%, #fb8b18 72%, #d83a0c 100%
  );
  box-shadow: 0 0 25px #ffb32490, 0 0 65px #ff870b40;
}
.sun::before {
  content: "";
  position: absolute;
  inset: 0;
  border-radius: inherit;
  background:
    radial-gradient(ellipse at 28% 40%, #fff5a565, transparent 22%),
    radial-gradient(ellipse at 65% 65%, #b3431835, transparent 25%),
    repeating-conic-gradient(from 30deg at 45% 55%, #ffef9935 0deg 8deg, transparent 9deg 18deg);
  opacity: 0.45;
  mix-blend-mode: soft-light;
  pointer-events: none;
}
.sun::after {
  content: "";
  position: absolute;
  inset: -5px;
  border-radius: inherit;
  border: 1px solid #ffc65a25;
  box-shadow: 0 0 12px #ffaa3330;
  pointer-events: none;
}

.orbit {
  --orbit-duration: 24s;
  --orbit-delay: 0s;
  position: absolute;
  width: 70%;
  height: 70%;
  top: 15%;
  left: 15%;
  border: 1px solid #c7ddff28;
  border-radius: 50%;
  pointer-events: none;
  animation: orbiting var(--orbit-duration) linear infinite;
  animation-delay: var(--orbit-delay);
  transform-origin: center;
}
.orbit-inner {
  width: 42%;
  height: 42%;
  top: 29%;
  left: 29%;
  --orbit-duration: 15s;
}
.orbit-outer {
  width: 98%;
  height: 98%;
  top: 1%;
  left: 1%;
  --orbit-duration: 48s;
  --orbit-delay: -12s;
}
@keyframes orbiting {
  from { transform: rotate(0deg); }
  to { transform: rotate(360deg); }
}
.orbit-planet {
  --ring-color: #e8c99b;
  --ring-light: #f3e3c9;
  --ring-dark: #9b845f;
  position: absolute;
  width: 38px;
  height: 38px;
  top: 50%;
  right: 0;
  border-radius: 50%;
  background: radial-gradient(circle at 30% 30%, #e0c3ff, #8758ff, #24104f);
  box-shadow: 0 0 15px #8758ff;
  pointer-events: auto;
  cursor: pointer;
  transform-origin: center;
  animation: counter-orbit var(--orbit-duration) linear infinite;
  animation-delay: var(--orbit-delay);
}
.ember {
  width: 28px;
  height: 28px;
  background: radial-gradient(circle at 30% 30%, #ffd9a3, #f58232, #6d2515);
  box-shadow: 0 0 15px #f58232;
}
.frost {
  width: 32px;
  height: 32px;
  background: radial-gradient(circle at 30% 30%, #e3faff, #64c9f4, #123269);
  box-shadow: 0 0 15px #64c9f4;
}
@keyframes counter-orbit {
  from { transform: translate(50%, -50%) rotate(0deg); }
  to { transform: translate(50%, -50%) rotate(-360deg); }
}
.planet-surface {
  position: absolute;
  inset: 0;
  z-index: 2;
  border-radius: inherit;
  background: inherit;
  pointer-events: none;
}
.orbit-planet.has-ring::before,
.orbit-planet.has-ring::after {
  content: "";
  position: absolute;
  left: 50%;
  top: 50%;
  width: 190%;
  height: 78%;
  transform: translate(-50%, -50%) rotate(-20deg);
  border-radius: 50%;
  pointer-events: none;
  background: radial-gradient(
    ellipse closest-side,
    transparent 58%, var(--ring-dark) 59% 64%, var(--ring-color) 65% 69%,
    transparent 70% 73%, var(--ring-light) 74% 79%, var(--ring-color) 80% 89%,
    var(--ring-dark) 90% 96%, transparent 97%
  );
}
.orbit-planet.has-ring::before {
  z-index: 1;
  clip-path: polygon(0 0, 100% 0, 100% 50%, 0 50%);
}
.orbit-planet.has-ring::after {
  z-index: 3;
  clip-path: polygon(0 50%, 100% 50%, 100% 100%, 0 100%);
}
.menu-moon {
  --moon-distance: 40px;
  position: absolute;
  left: 50%;
  top: 50%;
  width: 18%;
  height: 18%;
  border-radius: 50%;
  background: radial-gradient(circle at 30% 30%, #f5f6fa, #a4adbd 55%, #414959);
  box-shadow: 0 0 5px #c4c9d244;
  z-index: 4;
  pointer-events: none;
  animation: moon-orbit 12s linear infinite;
}
.ember .menu-moon { --moon-distance: 30px; }
.frost .menu-moon { --moon-distance: 35px; }

@keyframes moon-orbit {
  from { transform: translate(-50%, -50%) rotate(0deg) translateX(var(--moon-distance)) rotate(0deg); }
  to { transform: translate(-50%, -50%) rotate(360deg) translateX(var(--moon-distance)) rotate(-360deg); }
}

#solar-system:is(.is-paused, .is-manually-paused, :hover, :focus-within)
  :is(.orbit, .orbit-planet, .menu-moon) {
  animation-play-state: paused;
}
.planet-label {
  position: absolute;
  top: calc(100% + 12px);
  left: 50%;
  transform: translateX(-50%);
  padding: 6px 10px;
  max-width: 210px;
  overflow-wrap: anywhere;
  border-radius: 8px;
  background: #101e31;
  color: var(--text);
  font-size: 12px;
  white-space: normal;
  width: max-content;
  pointer-events: none;
  opacity: 0;
  z-index: 10;
}
.orbit-planet:is(:hover, :focus-visible) .planet-label {
  opacity: 1;
}

.iss-flight {
  position: absolute;
  inset: -16%;
  border: 1px dashed #a7d4ff18;
  border-radius: 50%;
  pointer-events: none;
  z-index: 6;
  animation: iss-lap 180s linear infinite;
}
#iss-button.floating-iss {
  position: absolute;
  top: 50%;
  right: 0;
  width: 94px;
  padding: 8px;
  border: 0;
  border-radius: 12px;
  background: transparent;
  color: #c7e7ff;
  font: inherit;
  cursor: pointer;
  pointer-events: auto;
  animation: iss-upright 180s linear infinite;
}
.floating-iss img {
  display: block;
  width: 100%;
  height: auto;
  pointer-events: none;
  filter: drop-shadow(0 0 8px #8bcfff45);
}
.floating-iss span {
  display: block;
  margin-top: 4px;
  font-size: 10px;
  line-height: 1.4;
  pointer-events: none;
}
@keyframes iss-lap {
  from { transform: rotate(0deg); }
  to { transform: rotate(360deg); }
}
@keyframes iss-upright {
  from { transform: translate(50%, -50%) rotate(0deg); }
  to { transform: translate(50%, -50%) rotate(-360deg); }
}

#customizer {
  padding-top: 36px;
}
.editor-header {
  display: flex;
  align-items: start;
  justify-content: space-between;
  gap: 20px;
  margin-bottom: 24px;
}
.editor-header h2 {
  font-size: clamp(1.8rem, 4vw, 3rem);
  margin: 0 0 10px;
  letter-spacing: -0.035em;
  overflow-wrap: anywhere;
}
#planet-description {
  color: var(--muted);
  margin-bottom: 0;
}
#back-button {
  flex-shrink: 0;
  font-size: 13px;
}
.editor-layout {
  display: grid;
  grid-template-columns: minmax(0, 1.4fr) minmax(280px, 1fr);
  gap: 24px;
  align-items: start;
}
.preview-panel {
  padding: 24px;
  text-align: center;
  background: radial-gradient(ellipse at 50% 40%, #36456933, transparent 70%), var(--panel);
}
.preview-heading {
  display: flex;
  align-items: center;
  justify-content: space-between;
  gap: 12px;
}
.preview-heading .eyebrow,
.preview-heading .preview-hint {
  margin: 0;
}
#planet-preview {
  width: 100%;
  height: clamp(320px, 43vw, 480px);
  margin: 10px auto;
}
#planet-preview canvas {
  display: block;
  width: 100%;
  height: 100%;
  cursor: grab;
  touch-action: none;
}
#planet-preview canvas:active {
  cursor: grabbing;
}
.preview-hint {
  color: var(--muted);
  font-size: 12px;
  line-height: 1.6;
}
.preview-actions {
  display: flex;
  justify-content: center;
  flex-wrap: wrap;
  gap: 10px;
}
.button-primary {
  background: var(--accent);
  color: #092219;
  border-color: var(--accent);
}
.button-primary:hover {
  background: #d0fff0;
  border-color: #d0fff0;
}
#download-status {
  min-height: 1.6em;
  margin: 12px 0 0;
}
.settings-panel {
  padding: 26px;
}
.editor-fieldset {
  padding: 0;
  border: 0;
  margin: 0 0 28px;
  min-width: 0;
}
.editor-fieldset:last-of-type {
  margin-bottom: 18px;
}
.editor-fieldset legend {
  padding: 0;
  margin-bottom: 18px;
  color: var(--accent);
  font-size: 11px;
  letter-spacing: 0.1em;
}
.editor-fieldset > label {
  display: block;
  color: #c0d0e0;
  font-size: 12px;
  margin-bottom: 8px;
}
input[type="text"],
select {
  display: block;
  width: 100%;
  min-height: 46px;
  border: 1px solid #b1d4ff35;
  border-radius: 10px;
  background: #070f1e;
  color: var(--text);
  padding: 10px 12px;
  margin-bottom: 18px;
}
input[type="color"] {
  width: 62px;
  height: 40px;
  padding: 4px;
  border: 1px solid #b1d4ff35;
  border-radius: 10px;
  background: #070f1e;
}
.field-row {
  display: flex;
  align-items: center;
  justify-content: space-between;
  gap: 12px;
  margin-bottom: 18px;
}
.field-row label {
  font-size: 12px;
  color: #c0d0e0;
}
.editor-fieldset > .toggle-row {
  display: flex;
  align-items: center;
  justify-content: space-between;
  gap: 12px;
  padding: 12px 0;
  margin-bottom: 16px;
  border-bottom: 1px solid var(--border);
  font-size: 14px;
}
input[type="checkbox"] {
  width: 18px;
  height: 18px;
  margin: 0;
  accent-color: var(--accent);
  cursor: pointer;
  flex-shrink: 0;
}
.field-help {
  color: var(--muted);
  font-size: 11px;
  margin: -8px 0 16px;
}
.save-status {
  margin: 0;
  padding-top: 16px;
  border-top: 1px solid var(--border);
  color: var(--muted);
  font-size: 12px;
  line-height: 1.6;
}

#explorer-guide {
  margin: 30px 0 0;
  padding: 18px 22px;
  border: 1px solid var(--border);
  border-radius: 16px;
  background: #0d182b9c;
  color: var(--muted);
  font-size: 13px;
  scroll-margin-top: 20px;
}
summary {
  cursor: pointer;
  color: var(--text);
}
.site-footer {
  display: flex;
  justify-content: space-between;
  gap: 30px;
  padding: 28px 0 20px;
  color: #879bb5;
  font-size: 12px;
}
.site-footer details {
  max-width: 600px;
  text-align: right;
}

dialog {
  width: min(900px, 94vw);
  max-height: 90vh;
  padding: 24px;
  overflow: auto;
  border: 1px solid #83b9da60;
  border-radius: 22px;
  background: #0b1527;
  color: var(--text);
  box-shadow: 0 25px 90px #00000080;
  text-align: left;
}
dialog::backdrop {
  background: #020611dd;
}
.iss-heading,
.telescope-heading {
  position: sticky;
  top: -24px;
  z-index: 1;
  display: flex;
  align-items: center;
  justify-content: space-between;
  gap: 16px;
  padding: 10px 0 16px;
  background: #0b1527;
  border-bottom: 1px solid var(--border);
}
.iss-screen {
  background: #020611;
  border-radius: 12px;
  overflow: hidden;
  margin-top: 20px;
}
#iss-video {
  display: block;
  width: 100%;
  aspect-ratio: 16 / 9;
  min-height: 200px;
  border: 0;
}
.space-telescope {
  --telescope-angle: -6deg;
  position: fixed;
  right: max(22px, env(safe-area-inset-right));
  bottom: max(24px, env(safe-area-inset-bottom));
  z-index: 2;
  width: 132px;
  padding: 8px;
  border: 1px solid transparent;
  border-radius: 18px;
  background: transparent;
  color: #d8edff;
  animation: telescope-drift 80s ease-in-out infinite;
}
@keyframes telescope-drift {
  0%, 100% { transform: translate(0, 0); }
  50% { transform: translate(-12px, -14px); }
}

@media (max-width: 900px) {
  body { padding-inline: 20px; }
  .home-grid, .editor-layout { grid-template-columns: 1fr; }
  .mission-list { grid-template-columns: repeat(3, minmax(0, 1fr)); }
}
@media (max-width: 600px) {
  body { padding-inline: 16px; }
  .mission-list { grid-template-columns: 1fr; }
  .editor-header { flex-direction: column; }
  dialog { padding: 16px; border-radius: 16px; }
}