@import url('./ui/responsive.css');
@import url('./ui/readability.css');

:root {
  font-family: Inter, 'Segoe UI', 'Microsoft YaHei', 'PingFang SC', sans-serif;
  color: #e5ebeb;
  background: #0b1217;
  color-scheme: dark;
  --mint: #89dfbf;
  --violet: #b4a8e8;
  --gold: #e9bc75;
  --muted: #7f919a;
  --line: #243038;
  --panel: #111c23;
  --progress: 0%;
  font-synthesis: none;
  scroll-behavior: smooth;
}
* {
  box-sizing: border-box;
}
body {
  margin: 0;
}
button,
input,
a,
summary {
  -webkit-tap-highlight-color: transparent;
}
button,
input {
  font: inherit;
}
button,
a,
summary {
  touch-action: manipulation;
}
button {
  cursor: pointer;
  color: inherit;
  border: 0;
  background: none;
  transition:
    background 0.18s,
    color 0.18s,
    border-color 0.18s;
}
button:disabled {
  cursor: default;
  opacity: 0.5;
}
a {
  color: inherit;
  text-decoration: none;
}
button,
a,
input,
summary {
  outline-offset: 5px;
}
button:focus-visible,
a:focus-visible,
input:focus-visible,
summary:focus-visible,
#scene:focus-visible {
  outline: 2px solid var(--mint);
}
[hidden] {
  display: none !important;
}
svg {
  flex-shrink: 0;
}
.icon {
  width: 20px;
  height: 20px;
  vertical-align: middle;
}
button .icon {
  pointer-events: none;
}
h1,
h2,
h3,
p {
  margin: 0;
}
button:hover {
  color: #fff;
}
canvas {
  display: block;
}
::selection {
  background: #427665;
  color: white;
}
.site-header {
  height: 86px;
  border-bottom: 1px solid #1e2a31;
  display: flex;
  align-items: center;
  justify-content: space-between;
  padding: 0 max(36px, calc((100vw - 1320px) / 2));
  gap: 36px;
  background: #0c1419;
}
.brand {
  display: flex;
  align-items: center;
  gap: 13px;
  white-space: nowrap;
}
.brand-mark {
  color: var(--mint);
}
.brand-mark .icon {
  width: 37px;
  height: 37px;
}
.brand strong {
  font-size: 23px;
  letter-spacing: 3px;
  font-weight: 650;
}
.brand-divider {
  height: 18px;
  width: 1px;
  background: #3b4a51;
  margin: 0 3px;
}
.brand-en {
  font-size: 10px;
  font-weight: 600;
  letter-spacing: 2.3px;
  color: #91a2aa;
}
.main-nav {
  display: flex;
  align-items: center;
  height: 100%;
  gap: 37px;
  margin-left: -46px;
  font-size: 13px;
}
.main-nav a,
.main-nav button {
  height: 100%;
  display: flex;
  align-items: center;
  gap: 7px;
  color: #87969f;
  font-size: 13px;
  padding: 0 1px;
  position: relative;
}
.main-nav .active {
  color: var(--mint);
}
.main-nav .active:after {
  content: '';
  height: 2px;
  position: absolute;
  bottom: 0;
  left: 0;
  right: 0;
  background: var(--mint);
}
.main-nav a:hover,
.main-nav button:hover {
  color: #d7ece3;
}
.nav-dot {
  width: 4px;
  height: 4px;
  background: var(--mint);
  border-radius: 50%;
}
.text-button {
  display: inline-flex;
  align-items: center;
  justify-content: center;
  gap: 8px;
  font-size: 12px;
  color: #98a7ae;
  padding: 6px 0;
}
.text-button:hover {
  color: var(--mint);
}
.header-guide {
  gap: 9px;
}
.header-guide .icon {
  width: 17px;
}
main {
  max-width: 1392px;
  margin: auto;
  padding: 0 36px;
}
.intro {
  display: flex;
  justify-content: space-between;
  align-items: center;
  padding: 39px 0 30px;
  scroll-margin-top: 20px;
}
.eyebrow {
  display: flex;
  align-items: center;
  gap: 8px;
  font-size: 10px;
  letter-spacing: 2px;
  color: var(--mint);
  font-weight: 500;
}
.eyebrow > span:first-child:empty {
  width: 5px;
  height: 5px;
  background: var(--mint);
  border-radius: 50%;
}
.intro h1 {
  font-size: 35px;
  letter-spacing: 2px;
  font-weight: 600;
  line-height: 1.5;
  margin: 9px 0 10px;
}
.title-dot {
  color: var(--mint);
  margin-left: 3px;
}
.intro p {
  font-size: 12px;
  color: #91a0a8;
  letter-spacing: 0.5px;
}
.chapter-mark {
  text-align: right;
  align-self: flex-end;
  padding-bottom: 4px;
}
.chapter-mark > span {
  color: #5d737c;
  font-size: 9px;
  letter-spacing: 2px;
}
.chapter-mark > div {
  display: flex;
  justify-content: flex-end;
  align-items: center;
  gap: 12px;
  margin-top: 10px;
}
.chapter-mark > div > span {
  font-size: 10px;
  color: #94a4ad;
  letter-spacing: 2px;
}
.chapter-mark i {
  height: 1px;
  background: #4d6068;
  width: 25px;
}
.chapter-mark b {
  font-size: 26px;
  color: #aebcc2;
  font-weight: 300;
}
.modebar {
  display: flex;
  align-items: center;
  justify-content: space-between;
  margin-bottom: 18px;
}
.mode-tabs {
  display: flex;
  border: 1px solid #27333b;
  border-radius: 9px;
  padding: 5px;
  background: #101a20;
  gap: 5px;
}
.mode-tab {
  display: flex;
  gap: 9px;
  align-items: center;
  padding: 12px 22px;
  font-size: 13px;
  color: #9babb3;
  border-radius: 5px;
}
.mode-tab .icon {
  width: 17px;
  height: 17px;
}
.mode-tab > span {
  margin-left: 13px;
  font-size: 9px;
  color: #627780;
  font-family: monospace;
}
.mode-tab:hover {
  background: #1c2c34;
}
.mode-tab.active {
  background: #233a36;
  color: #a7edd3;
  box-shadow: inset 0 0 0 1px #436356;
}
.mode-tab.active > span {
  color: #90bdac;
}
.mode-tab[data-mode='revolution'].active {
  background: #302d43;
  color: #d3c9ff;
  box-shadow: inset 0 0 0 1px #514960;
}
.mode-hint {
  font-size: 11px;
  color: #6f848d;
  display: flex;
  align-items: center;
  gap: 13px;
}
.mode-hint .icon {
  width: 16px;
}
.workspace {
  display: grid;
  grid-template-columns: minmax(0, 1fr) 310px;
  gap: 20px;
  align-items: start;
}
.simulation-panel {
  overflow: hidden;
  border: 1px solid #27333b;
  border-radius: 12px;
  background: #0c151b;
}
.viewport {
  height: 530px;
  position: relative;
  isolation: isolate;
  overflow: hidden;
  background:
    radial-gradient(ellipse at 39% 43%, #17252144, transparent 49%),
    radial-gradient(ellipse at 85% 58%, #152b3644, transparent 43%), #0b151c;
}
.viewport:before {
  content: '';
  position: absolute;
  inset: 0;
  pointer-events: none;
  z-index: -1;
  background-image:
    radial-gradient(circle at 14% 23%, #788f9860 0.7px, transparent 1px),
    radial-gradient(circle at 26% 73%, #788f9840 0.7px, transparent 1px),
    radial-gradient(circle at 77% 19%, #788f9840 1px, transparent 1.5px),
    radial-gradient(circle at 57% 83%, #788f9840 0.7px, transparent 1px),
    radial-gradient(circle at 90% 65%, #788f9840 0.6px, transparent 1px),
    radial-gradient(circle at 46% 12%, #788f9840 0.7px, transparent 1px);
}
#scene {
  position: absolute;
  inset: 0;
  outline-offset: -3px;
}
#scene canvas {
  width: 100%;
  height: 100%;
  touch-action: none;
}
.scene-topline {
  position: absolute;
  left: 22px;
  top: 21px;
  display: flex;
  gap: 13px;
  align-items: center;
  pointer-events: none;
}
.scene-status {
  display: flex;
  align-items: center;
  gap: 7px;
  font-size: 10px;
  color: #b1c4c7;
  border: 1px solid #2b3d44;
  border-radius: 5px;
  padding: 7px 10px;
  background: #101c22aa;
}
.scene-status i {
  width: 5px;
  height: 5px;
  border-radius: 50%;
  background: var(--mint);
  box-shadow: 0 0 9px #89dfbf44;
}
.view-caption {
  font-size: 9px;
  letter-spacing: 1px;
  color: #617780;
}
.view-tools {
  position: absolute;
  top: 19px;
  right: 18px;
  display: flex;
  gap: 5px;
}
.icon-button {
  width: 33px;
  height: 33px;
  padding: 0;
  display: inline-flex;
  align-items: center;
  justify-content: center;
  border-radius: 5px;
  color: #8ea1ab;
  flex-shrink: 0;
}
.icon-button .icon {
  width: 17px;
  height: 17px;
}
.icon-button:hover {
  background: #2d414d;
  color: #d9f6e9;
}
.view-tools .icon-button,
.zoom-tools .icon-button {
  background: #122029b3;
  border: 1px solid #283841;
}
.zoom-tools {
  position: absolute;
  right: 18px;
  bottom: 65px;
  display: flex;
  flex-direction: column;
  gap: 5px;
}
.scene-legend {
  position: absolute;
  bottom: 20px;
  left: 22px;
  display: flex;
  gap: 19px;
  font-size: 10px;
  color: #8b9ca5;
  pointer-events: none;
}
.scene-legend > span {
  display: flex;
  align-items: center;
  gap: 6px;
}
.scene-legend i {
  width: 14px;
  height: 2px;
  border-radius: 5px;
}
.mint {
  background: var(--mint);
}
.violet {
  background: var(--violet);
}
.gold {
  background: var(--gold);
}
.gesture-hint {
  position: absolute;
  bottom: 18px;
  right: 19px;
  color: #677e89;
  font-size: 9px;
  display: flex;
  gap: 7px;
  align-items: center;
  pointer-events: none;
}
.gesture-hint .icon {
  width: 13px;
  height: 15px;
}
.gesture-hint > span {
  margin: 0 1px;
}
.scene-loading {
  position: absolute;
  inset: 0;
  display: flex;
  align-items: center;
  justify-content: center;
  gap: 12px;
  color: #b4c4c8;
  font-size: 13px;
  background: #0b151c;
  z-index: 3;
}
.loader {
  width: 18px;
  height: 18px;
  border: 2px solid #345247;
  border-top-color: var(--mint);
  border-radius: 50%;
  animation: spin 1s linear infinite;
}
@keyframes spin {
  to {
    transform: rotate(360deg);
  }
}
.spatial-labels {
  position: absolute;
  inset: 0;
  pointer-events: none;
  overflow: hidden;
}
.spatial-label {
  position: absolute;
  left: 0;
  top: 0;
  display: flex;
  gap: 5px;
  align-items: center;
  font-size: 10px;
  white-space: nowrap;
  text-shadow:
    0 2px 6px #071017,
    0 0 10px #071017;
  background: #0c161c60;
  border-radius: 3px;
  padding: 3px 5px;
  will-change: transform;
}
.spatial-label small {
  color: #6f8791;
  font-size: 7px;
  letter-spacing: 1.5px;
  margin-left: 2px;
}
.spatial-label b {
  font-weight: 500;
}
.sun-label {
  color: #f2d095;
}
.earth-label {
  color: #c1dee0;
}
.earth-label i,
.observer-label i {
  background: var(--mint);
  width: 4px;
  height: 4px;
  border-radius: 50%;
}
.axis-label {
  color: var(--mint);
  font-size: 10px;
}
.axis-label em {
  font-style: normal;
  color: var(--gold);
  margin-left: 4px;
}
.mint-label {
  color: var(--mint);
  font-size: 11px;
}
.violet-label {
  color: var(--violet);
  letter-spacing: 1px;
}
.rays-label {
  color: #d1ad73;
  font-size: 9px;
  letter-spacing: 2px;
}
.observer-label {
  color: #ecd194;
  font-size: 9px;
}
.observer-label i {
  background: #ecd194;
}
.day-label {
  color: #f2d28a;
  background: #574224b0;
}
.night-label {
  color: #c1b6ff;
  background: #29223eb0;
}
.transport {
  border-top: 1px solid #233139;
  padding: 19px 23px 17px;
  background: #111c23;
}
.timeline-title {
  display: flex;
  align-items: center;
  gap: 13px;
  font-size: 10px;
  color: #768d97;
  margin-bottom: 11px;
}
.timeline-title label {
  display: flex;
  align-items: center;
  gap: 7px;
  color: #c0cdd2;
  font-size: 11px;
}
.timeline-title .icon {
  width: 14px;
  height: 14px;
}
.timeline-title > output {
  margin-left: auto;
  font-size: 10px;
  color: #adc6c6;
  font-variant-numeric: tabular-nums;
}
.timeline-title > span {
  font-size: 9px;
}
input[type='range'] {
  display: block;
  -webkit-appearance: none;
  appearance: none;
  width: 100%;
  height: 4px;
  border-radius: 4px;
  background: linear-gradient(
    to right,
    var(--mint) 0%,
    var(--mint) var(--progress),
    #304048 var(--progress),
    #304048 100%
  );
  cursor: pointer;
  margin: 9px 0;
  accent-color: var(--mint);
}
input[type='range']::-webkit-slider-thumb {
  -webkit-appearance: none;
  width: 12px;
  height: 12px;
  background: #b1ebd3;
  border-radius: 50%;
  box-shadow: 0 0 0 4px #7dcaa91a;
  border: 2px solid #e0fcef;
}
input[type='range']::-moz-range-thumb {
  width: 10px;
  height: 10px;
  background: #b1ebd3;
  border-radius: 50%;
  border: 2px solid #e0fcef;
}
.timeline-ticks {
  display: flex;
  justify-content: space-between;
  font-size: 8px;
  color: #758893;
  margin-top: 11px;
}
.playback-row {
  display: flex;
  align-items: center;
  justify-content: space-between;
  gap: 5px;
  margin-top: 20px;
}
.playback-main {
  display: flex;
  align-items: center;
  gap: 10px;
}
.play-button {
  width: 35px;
  height: 35px;
  background: var(--mint);
  color: #102a24;
  border-radius: 50%;
  display: grid;
  place-items: center;
}
.play-button:hover {
  background: #b0f2d6;
  color: #102a24;
}
.play-button .icon {
  width: 16px;
  height: 16px;
}
.control-divider {
  width: 1px;
  height: 19px;
  background: #344149;
  margin: 0 5px;
}
.speed-label {
  font-size: 10px;
  color: #82959e;
  margin-right: 3px;
}
.speeds {
  display: flex;
  gap: 5px;
}
.speed-button {
  font-size: 10px;
  min-width: 37px;
  padding: 6px 7px;
  color: #91a5ac;
  border-radius: 4px;
  border: 1px solid transparent;
}
.speed-button.active {
  color: #b6decf;
  background: #293e39;
  border-color: #3a554d;
}
.speed-button:hover {
  background: #243840;
}
.teaching-badge {
  display: flex;
  align-items: center;
  gap: 6px;
  color: #82979f;
  font-size: 9px;
  white-space: nowrap;
}
.teaching-badge .icon {
  width: 12px;
  height: 12px;
}
.scale-note {
  font-size: 9px;
  color: #758991;
  margin-top: 16px;
  letter-spacing: 0.1px;
}
.sidebar {
  display: flex;
  flex-direction: column;
  gap: 14px;
}
.info-card {
  background: linear-gradient(140deg, #142229, #111c23 70%);
  border: 1px solid #2a373e;
  border-radius: 12px;
  padding: 22px 22px 18px;
}
.section-kicker {
  display: flex;
  justify-content: space-between;
  font-size: 9px;
  color: #91a5ad;
  letter-spacing: 1px;
}
.section-kicker > span:last-child {
  font-size: 8px;
  color: #6e848f;
  font-family: monospace;
}
.info-heading {
  display: flex;
  align-items: center;
  gap: 10px;
  margin: 24px 0 12px;
  color: var(--mint);
  font-size: 11px;
  letter-spacing: 1px;
}
.info-icon {
  width: 32px;
  height: 32px;
  background: #27463b66;
  border: 1px solid #3f655355;
  border-radius: 8px;
  display: grid;
  place-items: center;
}
.info-icon .icon {
  width: 19px;
  height: 19px;
}
.info-card h2 {
  font-size: 20px;
  font-weight: 550;
  letter-spacing: 0.2px;
  line-height: 1.5;
}
.info-description {
  color: #93a6ae;
  font-size: 11px;
  line-height: 1.95;
  margin-top: 10px;
  min-height: 44px;
}
.period-block {
  margin: 20px 0 16px;
  border-left: 2px solid #75cba588;
  padding-left: 14px;
}
.period-block > span {
  color: #8fa4ad;
  font-size: 10px;
}
.period-block > div {
  display: flex;
  align-items: baseline;
  gap: 8px;
  margin-top: 4px;
}
.period-block strong {
  font-family: 'Segoe UI', sans-serif;
  font-size: 42px;
  font-weight: 350;
  letter-spacing: -1px;
  line-height: 1.1;
  color: #e1eeea;
}
.period-block > div > span {
  font-size: 12px;
  color: #aec2c6;
}
.period-block .period-tag {
  font-size: 9px;
  background: #213b3266;
  color: #8fd3b5;
  border: 1px solid #416c4d44;
  padding: 4px 7px;
  border-radius: 4px;
  margin-left: 5px;
  align-self: center;
}
.takeaway {
  display: flex;
  gap: 7px;
  align-items: center;
  color: #95a8ae;
  font-size: 10px;
  line-height: 1.8;
}
.takeaway .icon {
  color: var(--gold);
  width: 14px;
  height: 14px;
}
.takeaway b {
  font-weight: 500;
  color: #c6d3d4;
}
.observer-card {
  background: #0c171f80;
  border: 1px solid #273a43;
  border-radius: 7px;
  padding: 12px;
  margin-top: 20px;
}
.observer-top {
  display: flex;
  align-items: center;
  justify-content: space-between;
  gap: 8px;
  font-size: 10px;
}
.observer-top > span {
  display: flex;
  align-items: center;
  gap: 5px;
}
.observer-top .icon {
  height: 13px;
  width: 13px;
  color: #90a5ae;
}
.observer-top .day-state {
  color: #e9bf7a;
  font-size: 9px;
}
.observer-top .day-state .icon {
  color: inherit;
}
.observer-top .day-state.night {
  color: #b7adf1;
}
.day-strip {
  display: flex;
  align-items: center;
  gap: 9px;
  margin-top: 13px;
  color: #6f8590;
  font-size: 8px;
}
.day-track {
  height: 4px;
  position: relative;
  border-radius: 5px;
  background: linear-gradient(90deg, #c7a869, #576a6d 50%, #60557e);
  flex: 1;
}
.day-track i {
  height: 8px;
  width: 8px;
  border: 2px solid #ede2c3;
  background: #968a70;
  border-radius: 50%;
  position: absolute;
  top: -2px;
  left: 22%;
  transition: left 1s;
}
.observer-card p {
  font-size: 9px;
  line-height: 1.7;
  color: #78909a;
  margin-top: 11px;
}
.lesson-button {
  display: flex;
  align-items: center;
  justify-content: space-between;
  width: 100%;
  padding: 12px 0;
  color: #a2cdbb;
  font-size: 10px;
  margin: 3px 0 4px;
}
.lesson-button .icon {
  width: 16px;
}
.lesson-button:hover {
  color: #cffce7;
}
.observation-options {
  border-top: 1px solid #2a3841;
  padding-top: 16px;
}
.options-title {
  display: flex;
  align-items: center;
  justify-content: space-between;
  margin-bottom: 15px;
}
.options-title h3 {
  font-size: 11px;
  font-weight: 500;
  color: #b4c2c8;
}
.options-title > span {
  font-size: 8px;
  color: #6d848f;
}
.toggle-grid {
  display: grid;
  grid-template-columns: 1fr 1fr;
  column-gap: 18px;
  row-gap: 13px;
}
.toggle {
  position: relative;
  display: flex;
  align-items: center;
  justify-content: space-between;
  gap: 7px;
  cursor: pointer;
  color: #a0b2ba;
  font-size: 9px;
}
.toggle input {
  position: absolute;
  right: 0;
  opacity: 0;
  width: 26px;
  height: 20px;
  margin: 0;
  cursor: pointer;
}
.switch {
  display: block;
  width: 25px;
  height: 14px;
  border-radius: 20px;
  background: #34464f;
  pointer-events: none;
  flex-shrink: 0;
}
.switch:after {
  content: '';
  display: block;
  width: 10px;
  height: 10px;
  position: relative;
  top: 2px;
  left: 2px;
  border-radius: 50%;
  background: #7d929d;
  transition: transform 0.2s;
}
.toggle input:checked + .switch {
  background: #416d5b;
}
.toggle input:checked + .switch:after {
  background: #b1ebd0;
  transform: translateX(11px);
}
.toggle input:focus-visible + .switch {
  outline: 2px solid var(--mint);
  outline-offset: 4px;
}
.axis-note {
  font-size: 8px;
  line-height: 1.8;
  color: #718891;
  margin-top: 14px;
}
.info-card[data-mode='revolution'] .info-heading {
  color: var(--violet);
}
.info-card[data-mode='revolution'] .info-icon {
  background: #3b3549;
  border-color: #534764;
}
.info-card[data-mode='revolution'] .period-block {
  border-color: #8c7bbc;
}
.experiment-card {
  border: 1px solid #2a373e;
  border-radius: 9px;
  background: #111d25;
}
.experiment-card summary {
  cursor: pointer;
  list-style: none;
  padding: 16px;
  display: flex;
  align-items: center;
  gap: 12px;
}
.experiment-card summary::-webkit-details-marker {
  display: none;
}
.experiment-icon {
  width: 32px;
  height: 34px;
  display: grid;
  place-items: center;
  color: #abbdc9;
  background: #1d2c37;
  border-radius: 7px;
}
.experiment-icon .icon {
  width: 18px;
  height: 18px;
}
.experiment-card summary b {
  font-size: 11px;
  font-weight: 500;
  color: #c3d0d6;
}
.experiment-card summary small {
  display: block;
  font-size: 9px;
  color: #788f9b;
  margin-top: 4px;
}
.expand-indicator {
  margin-left: auto;
  width: 15px;
  height: 15px;
  color: #8b9da8;
}
.experiment-card[open] .expand-indicator {
  transform: rotate(45deg);
}
.experiment-body {
  padding: 2px 18px 17px;
}
.experiment-body > label {
  display: flex;
  justify-content: space-between;
  color: #b2c3ca;
  font-size: 11px;
  margin: 12px 0;
}
.experiment-body output {
  color: var(--mint);
  font-variant-numeric: tabular-nums;
}
.range-limits {
  display: flex;
  justify-content: space-between;
  color: #6f8793;
  font-size: 8px;
  margin: 11px 0 21px;
}
.experiment-body p {
  font-size: 10px;
  color: #a1c3b4;
  line-height: 1.9;
  padding: 10px;
  border: 1px solid #29443a;
  border-radius: 5px;
  background: #1b30264d;
  margin-bottom: 10px;
}
.experiment-body .text-button {
  font-size: 10px;
}
.experiment-body .text-button .icon {
  width: 12px;
}
.welcome-tip,
.lesson-card {
  position: absolute;
  left: 23px;
  bottom: 57px;
  width: 293px;
  padding: 17px 18px 13px;
  border: 1px solid #405d5266;
  border-radius: 9px;
  background: #14231eee;
  box-shadow: 0 10px 35px #0003;
  backdrop-filter: blur(12px);
  z-index: 2;
}
.tip-kicker {
  display: flex;
  align-items: center;
  gap: 12px;
  letter-spacing: 1px;
  color: #8abcaa;
  font-size: 8px;
  padding-right: 20px;
}
.tip-kicker > span {
  font-size: 8px;
  color: #91a79d;
  letter-spacing: 0;
}
.tip-close {
  position: absolute;
  right: 6px;
  top: 5px;
  width: 27px;
  height: 27px;
}
.tip-close .icon {
  width: 13px;
  height: 13px;
}
.welcome-tip h3,
.lesson-card h3 {
  font-size: 13px;
  font-weight: 500;
  margin-top: 11px;
  color: #dae9e1;
}
.welcome-tip p,
.lesson-card p {
  font-size: 10px;
  line-height: 1.9;
  color: #92aa9e;
  margin-top: 7px;
}
.tip-bottom {
  display: flex;
  justify-content: space-between;
  align-items: center;
  margin-top: 10px;
}
.step-dots {
  display: flex;
  gap: 5px;
}
.step-dots i {
  width: 4px;
  height: 4px;
  border-radius: 5px;
  background: #476355;
}
.step-dots i.active {
  width: 14px;
  background: #9bdfbd;
}
.tip-next {
  font-size: 10px;
  color: var(--mint);
}
.tip-next .icon {
  width: 14px;
  height: 14px;
}
.lesson-card {
  width: 342px;
  border-color: #67594288;
  background: #211f19ee;
}
.lesson-card .tip-kicker {
  color: #d6bb8d;
}
.lesson-card p {
  color: #b5aa91;
}
.lesson-actions {
  display: flex;
  justify-content: space-between;
  align-items: center;
  margin-top: 11px;
  gap: 10px;
}
.lesson-actions .text-button {
  font-size: 10px;
  color: #e2c893;
}
.lesson-actions .icon {
  width: 14px;
}
.milestone {
  position: absolute;
  top: 65px;
  left: 50%;
  transform: translateX(-50%);
  padding: 9px 15px;
  border-radius: 6px;
  border: 1px solid #48674f;
  color: #c6e8cc;
  background: #1a2d23ee;
  font-size: 11px;
  white-space: nowrap;
  pointer-events: none;
}
.milestone .icon {
  width: 14px;
  height: 14px;
  margin-right: 5px;
}
.counter-strip {
  display: grid;
  grid-template-columns: 1.05fr 1.05fr 1fr 1fr;
  border: 1px solid #26343c;
  border-radius: 10px;
  background: #101b22;
  margin-top: 20px;
  padding: 21px 9px;
}
.counter-item {
  padding: 0 24px;
  display: flex;
  align-items: center;
  gap: 13px;
  border-right: 1px solid #28363e;
}
.counter-item:last-child {
  border-right: 0;
}
.counter-icon {
  width: 34px;
  height: 34px;
  border-radius: 50%;
  background: #172a28;
  display: grid;
  place-items: center;
  flex-shrink: 0;
}
.counter-icon.violet-text {
  background: #262636;
}
.counter-icon .icon {
  width: 20px;
  height: 20px;
}
.counter-label {
  display: flex;
  gap: 5px;
  font-size: 9px;
  color: #8ba0ab;
  margin-bottom: 8px;
}
.counter-label small {
  font-size: 7px;
  color: #617983;
}
.counter-item > div > div {
  display: flex;
  gap: 7px;
  align-items: baseline;
}
.counter-item strong {
  font-size: 25px;
  font-weight: 400;
  letter-spacing: 0.5px;
  font-variant-numeric: tabular-nums;
  line-height: 1;
}
.counter-item > div > div > span {
  font-size: 10px;
  color: #95aab4;
}
.counter-item > div > div > small {
  font-size: 8px;
  color: #6e8590;
  margin-left: 7px;
}
.mint-text {
  color: var(--mint);
}
.violet-text {
  color: var(--violet);
}
.progress-counter {
  justify-content: space-between;
}
.progress-ring {
  width: 39px;
  height: 39px;
  transform: rotate(-90deg);
}
.progress-ring circle {
  fill: none;
  stroke: #2b3c43;
  stroke-width: 2.3;
}
.progress-ring circle:last-child {
  stroke: var(--violet);
  stroke-dasharray: 113.1;
  stroke-dashoffset: 113.1;
  stroke-linecap: round;
}
.comparison-section {
  padding-top: 42px;
  scroll-margin-top: 25px;
}
.comparison-heading {
  display: flex;
  align-items: flex-end;
  justify-content: space-between;
  margin-bottom: 20px;
}
.comparison-heading .eyebrow {
  font-size: 9px;
  color: #819993;
  letter-spacing: 1px;
}
.comparison-heading h2 {
  font-size: 21px;
  font-weight: 500;
  letter-spacing: 0.8px;
  margin-top: 10px;
}
.comparison-heading > p {
  font-size: 10px;
  color: #718893;
  margin-bottom: 3px;
}
.comparison-cards {
  display: grid;
  grid-template-columns: 1fr 1fr;
  gap: 20px;
}
.comparison-card {
  display: flex;
  gap: 22px;
  border: 1px solid #293a3e;
  border-radius: 9px;
  background: linear-gradient(110deg, #16292388, #12202744);
  padding: 24px;
}
.comparison-symbol {
  width: 59px;
  display: flex;
  align-items: center;
  justify-content: center;
  color: var(--mint);
}
.comparison-symbol .icon {
  width: 48px;
  height: 48px;
  stroke-width: 1;
}
.comparison-content {
  flex: 1;
}
.comparison-card h3 {
  font-size: 15px;
  font-weight: 500;
  color: #cce4d8;
}
.comparison-card h3 > span {
  font-size: 8px;
  font-weight: 400;
  letter-spacing: 1.5px;
  color: #659681;
  margin-left: 8px;
}
.comparison-card dl {
  display: grid;
  grid-template-columns: 1fr 1fr 1fr;
  gap: 9px;
  margin: 17px 0 0;
}
.comparison-card dt {
  font-size: 9px;
  color: #718b8f;
  margin-bottom: 7px;
}
.comparison-card dd {
  font-size: 11px;
  color: #bbcec8;
  margin: 0;
  white-space: nowrap;
}
.comparison-card > .icon-button {
  border: 1px solid #2e443e;
  color: #81b69e;
  align-self: flex-start;
  width: 25px;
  height: 25px;
}
.comparison-card > .icon-button .icon {
  width: 13px;
  height: 13px;
}
.revolution-card {
  background: linear-gradient(110deg, #24223888, #14202744);
  border-color: #343443;
}
.revolution-card .comparison-symbol {
  color: var(--violet);
}
.revolution-card h3 {
  color: #d6cfee;
}
.revolution-card h3 > span {
  color: #8d7fae;
}
.revolution-card > .icon-button {
  border-color: #414052;
  color: #aaa0d5;
}
.combined-takeaway {
  display: flex;
  align-items: center;
  justify-content: center;
  gap: 8px;
  font-size: 11px;
  color: #92a6af;
  margin-top: 20px;
  padding: 15px 0;
}
.combined-takeaway > .icon {
  width: 14px;
  height: 14px;
  margin-right: 2px;
  color: #abb6af;
}
.combined-takeaway b {
  font-weight: 500;
}
.simultaneous {
  font-size: 8px;
  border: 1px solid #40544b;
  border-radius: 3px;
  padding: 3px 5px;
  color: #a0b9ae;
  margin-left: 4px;
}
.combined-takeaway .text-button {
  font-size: 10px;
  margin-left: 20px;
}
.combined-takeaway .text-button .icon {
  width: 14px;
  height: 14px;
}
.quiz-banner {
  display: flex;
  align-items: center;
  gap: 18px;
  padding: 24px 28px;
  border: 1px solid #2b3a40;
  border-radius: 10px;
  margin-top: 16px;
  background: #142029;
}
.quiz-banner-icon {
  width: 40px;
  height: 40px;
  background: #253731;
  border: 1px solid #3c5447;
  border-radius: 10px;
  display: grid;
  place-items: center;
  color: #a4d5b9;
}
.quiz-banner-icon .icon {
  width: 21px;
  height: 21px;
}
.quiz-banner h2 {
  font-size: 15px;
  font-weight: 500;
}
.quiz-banner p {
  color: #8198a2;
  font-size: 10px;
  margin-top: 7px;
}
.primary-button,
.secondary-button {
  display: inline-flex;
  align-items: center;
  justify-content: center;
  gap: 15px;
  border-radius: 5px;
  padding: 12px 18px;
  font-size: 11px;
  color: #183a2b;
  background: #a5ddbf;
  font-weight: 550;
}
.primary-button:hover {
  background: #c2f3d7;
  color: #0d2f20;
}
.primary-button .icon {
  width: 15px;
  height: 15px;
}
.quiz-banner > .primary-button {
  margin-left: auto;
}
.secondary-button {
  background: #20333c;
  color: #bfd0d5;
  border: 1px solid #3a515c;
}
footer {
  display: flex;
  justify-content: space-between;
  align-items: center;
  padding: 28px 0 25px;
  color: #657c87;
  font-size: 9px;
}
footer i {
  font-style: normal;
  margin: 0 10px;
}
footer .text-button {
  font-size: 9px;
}
footer .icon {
  width: 12px;
  height: 12px;
}
.modal {
  color: #dce7e9;
  border: 1px solid #384b53;
  background: #132028;
  border-radius: 15px;
  width: min(500px, calc(100vw - 32px));
  max-height: 90dvh;
  padding: 37px;
  box-shadow: 0 25px 100px #0008;
  overflow: auto;
}
.modal::backdrop {
  background: #03090dcc;
  backdrop-filter: blur(6px);
}
.modal-close {
  position: absolute;
  right: 14px;
  top: 13px;
}
.modal .eyebrow {
  font-size: 10px;
  margin-bottom: 22px;
}
.modal h2 {
  font-size: 23px;
  font-weight: 500;
  line-height: 1.6;
  margin-bottom: 20px;
}
.about-modal > p,
.about-modal li {
  font-size: 12px;
  line-height: 2;
  color: #9bb0ba;
}
.about-modal ul {
  padding-left: 18px;
}
.about-modal li {
  padding-bottom: 9px;
}
.about-modal .source-links {
  font-size: 10px;
  margin: 20px 0;
}
.source-links a {
  color: var(--mint);
  text-decoration: underline;
  text-underline-offset: 3px;
}
.about-modal > .primary-button {
  width: 100%;
  margin-top: 10px;
}
.quiz-progress {
  display: flex;
  gap: 6px;
  margin: 0 0 24px;
}
.quiz-progress span {
  flex: 1;
  background: #2d424c;
  height: 3px;
  border-radius: 3px;
}
.quiz-progress span.active {
  background: var(--mint);
}
.quiz-options {
  display: flex;
  flex-direction: column;
  gap: 11px;
}
.quiz-option {
  display: flex;
  align-items: center;
  gap: 12px;
  text-align: left;
  width: 100%;
  padding: 14px;
  border: 1px solid #31474f;
  border-radius: 7px;
  font-size: 13px;
  background: #15262f;
  color: #c1d1d8;
}
.quiz-option > span {
  width: 26px;
  height: 26px;
  display: grid;
  place-items: center;
  border: 1px solid #3d5560;
  border-radius: 5px;
  font-size: 10px;
}
.quiz-option > i {
  margin-left: auto;
}
.quiz-option:hover {
  border-color: #83b99e;
  background: #1c342e;
}
.quiz-option:disabled {
  opacity: 1;
}
.quiz-option.correct {
  border-color: #7ebd9f;
  background: #224235;
  color: #bdecd2;
}
.quiz-option.incorrect {
  border-color: #ad8068;
  background: #3b2d29;
}
.quiz-feedback {
  padding: 14px;
  margin-top: 15px;
  background: #1e3430;
  border: 1px solid #325347;
  border-radius: 7px;
}
.quiz-feedback > b {
  font-size: 12px;
  color: #b4dfc5;
}
.quiz-feedback > p {
  font-size: 11px;
  color: #a9bfb6;
  line-height: 1.9;
  margin-top: 5px;
}
.quiz-next {
  width: 100%;
  margin-top: 23px;
}
.quiz-complete-icon {
  width: 61px;
  height: 61px;
  border: 1px solid #4b6e53;
  background: #2b4434;
  border-radius: 50%;
  display: grid;
  place-items: center;
  margin: 0 auto 20px;
  color: var(--mint);
}
.quiz-complete-icon .icon {
  width: 28px;
  height: 28px;
}
.quiz-score {
  font-size: 14px;
  color: #a4bcb5;
}
.quiz-score strong {
  font-size: 25px;
  color: var(--mint);
  font-weight: 400;
  margin: 0 4px;
}
.quiz-result-text {
  font-size: 13px;
  line-height: 2.3;
  color: #b4c9c1;
  margin: 20px 0;
}
.quiz-end-actions {
  display: flex;
  gap: 12px;
  margin-top: 26px;
}
.quiz-end-actions button {
  flex: 1;
}
.skip-link {
  position: fixed;
  top: -60px;
  left: 20px;
  background: var(--mint);
  color: #102c22;
  padding: 12px;
  z-index: 50;
}
.skip-link:focus {
  top: 10px;
}
.viewport:fullscreen,
.viewport.expanded-view {
  height: 100dvh;
  width: 100vw;
  background-color: #0b151c;
}
.viewport.expanded-view {
  position: fixed;
  inset: 0;
  z-index: 40;
}
.scene-error {
  padding: 30px;
  color: #bccfd5;
  font-size: 13px;
  text-align: center;
  line-height: 2;
}
.scene-error button {
  margin: 18px auto 0;
  display: block;
}
.paused .scene-status i {
  box-shadow: none;
}