@font-face {
  font-family: "Instrument Serif";
  src: url("./assets/fonts/instrument-serif-regular.woff2") format("woff2");
  font-style: normal;
  font-weight: 400;
  font-display: swap;
}

@font-face {
  font-family: "Instrument Serif";
  src: url("./assets/fonts/instrument-serif-italic.woff2") format("woff2");
  font-style: italic;
  font-weight: 400;
  font-display: swap;
}

@font-face {
  font-family: "Space Grotesk";
  src: url("./assets/fonts/space-grotesk-variable.woff2") format("woff2");
  font-style: normal;
  font-weight: 300 700;
  font-display: swap;
}

:root {
  color-scheme: dark;
  --bg: #05080c;
  --bg-deep: #020406;
  --surface: rgba(12, 18, 24, 0.82);
  --surface-solid: #0c1218;
  --surface-raised: #111922;
  --ink: #f4f1e9;
  --ink-soft: #d5d2ca;
  --muted: #9aa3ad;
  --faint: #6e7781;
  --line: rgba(244, 241, 233, 0.14);
  --line-strong: rgba(244, 241, 233, 0.28);
  --gold: #e4b56b;
  --gold-bright: #ffd99b;
  --blue: #8fc9e8;
  --body-color: #77b7f6;
  --orb-hi: #9fd5ff;
  --orb-mid: #2878b9;
  --orb-low: #071d36;
  --display: "Instrument Serif", "Iowan Old Style", "Baskerville", "Songti SC", "SimSun", serif;
  --sans: "Space Grotesk", "Microsoft YaHei UI", "PingFang SC", "Hiragino Sans GB", sans-serif;
  --mono: "Space Grotesk", "SFMono-Regular", "Cascadia Mono", monospace;
  --ease-out: cubic-bezier(0.22, 1, 0.36, 1);
  --ease-soft: cubic-bezier(0.65, 0, 0.35, 1);
}

* {
  box-sizing: border-box;
}

html {
  scroll-behavior: smooth;
  background: var(--bg-deep);
}

body {
  margin: 0;
  min-width: 320px;
  overflow-x: hidden;
  background:
    radial-gradient(circle at 85% 8%, rgba(45, 77, 105, 0.18), transparent 29rem),
    var(--bg-deep);
  color: var(--ink);
  font-family: var(--sans);
  font-size: 16px;
  line-height: 1.5;
  -webkit-font-smoothing: antialiased;
}

button,
input,
a {
  font: inherit;
}

button,
a {
  -webkit-tap-highlight-color: transparent;
}

button {
  color: inherit;
}

a {
  color: inherit;
  text-decoration: none;
}

button:focus-visible,
a:focus-visible,
input:focus-visible {
  outline: 2px solid var(--gold-bright);
  outline-offset: 4px;
}

button {
  cursor: pointer;
}

.sr-only {
  position: absolute !important;
  width: 1px !important;
  height: 1px !important;
  padding: 0 !important;
  margin: -1px !important;
  overflow: hidden !important;
  clip: rect(0, 0, 0, 0) !important;
  white-space: nowrap !important;
  border: 0 !important;
}

.skip-link {
  position: fixed;
  top: 12px;
  left: 12px;
  z-index: 1000;
  padding: 12px 18px;
  transform: translateY(-160%);
  background: var(--ink);
  color: var(--bg);
  font-size: 14px;
  font-weight: 600;
  transition: transform 180ms var(--ease-out);
}

.skip-link:focus {
  transform: translateY(0);
}

.site-header {
  position: fixed;
  inset: 0 0 auto;
  z-index: 80;
  height: 72px;
  display: grid;
  grid-template-columns: 1fr auto 1fr;
  align-items: center;
  gap: 24px;
  padding: 0 32px;
  border-bottom: 1px solid var(--line);
  background: rgba(5, 8, 12, 0.74);
  backdrop-filter: blur(18px) saturate(125%);
}

.brand {
  display: inline-flex;
  align-items: center;
  justify-self: start;
  gap: 12px;
  min-height: 44px;
}

.brand-mark {
  width: 29px;
  height: 29px;
  overflow: visible;
  fill: none;
  stroke: var(--gold);
  stroke-width: 1.25;
  transition: transform 500ms var(--ease-out);
}

.brand:hover .brand-mark {
  transform: rotate(16deg);
}

.brand-mark circle:first-child {
  fill: var(--gold);
  stroke: none;
}

.brand-satellite {
  fill: var(--ink);
  stroke: none;
}

.brand-copy {
  display: grid;
  gap: 1px;
  line-height: 1.2;
}

.brand-en {
  font-size: 10px;
  font-weight: 600;
  letter-spacing: 0.19em;
}

.brand-cn {
  color: var(--muted);
  font-size: 12px;
  letter-spacing: 0.12em;
}

.mode-nav {
  display: flex;
  align-items: stretch;
  justify-content: center;
  height: 72px;
}

.mode-button {
  position: relative;
  display: inline-flex;
  align-items: center;
  justify-content: center;
  gap: 8px;
  min-width: 132px;
  min-height: 44px;
  padding: 0 20px;
  border: 0;
  border-left: 1px solid transparent;
  border-right: 1px solid transparent;
  background: transparent;
  color: var(--faint);
  font-size: 13px;
  letter-spacing: 0.04em;
  transition:
    color 180ms ease,
    background-color 180ms ease,
    border-color 180ms ease;
}

.mode-button span {
  color: currentColor;
  font-family: var(--mono);
  font-size: 9px;
  letter-spacing: 0.08em;
  opacity: 0.72;
}

.mode-button::after {
  content: "";
  position: absolute;
  right: 20px;
  bottom: 0;
  left: 20px;
  height: 1px;
  background: var(--gold);
  transform: scaleX(0);
  transform-origin: center;
  transition: transform 260ms var(--ease-out);
}

.mode-button:hover,
.mode-button.is-active {
  color: var(--ink);
  background: rgba(255, 255, 255, 0.025);
}

.mode-button.is-active::after {
  transform: scaleX(1);
}

.mode-link:hover {
  color: var(--ink);
}

.header-status {
  display: flex;
  align-items: center;
  justify-self: end;
  gap: 18px;
  color: var(--faint);
  font-family: var(--mono);
  font-size: 9px;
  font-weight: 500;
  letter-spacing: 0.12em;
}

.status-time {
  min-width: 112px;
  text-align: right;
}

.live-mark {
  display: inline-flex;
  align-items: center;
  gap: 8px;
  color: var(--ink-soft);
}

.live-mark i {
  width: 5px;
  height: 5px;
  border-radius: 50%;
  background: #7ee0b0;
  box-shadow: 0 0 9px rgba(126, 224, 176, 0.85);
  animation: live-pulse 2.6s ease-in-out infinite;
}

.atlas-stage {
  position: relative;
  isolation: isolate;
  height: calc(100svh - 72px);
  min-height: 720px;
  max-height: 1040px;
  overflow: hidden;
  border-bottom: 1px solid var(--line);
  background:
    radial-gradient(ellipse at 46% 52%, rgba(49, 71, 86, 0.14), transparent 38%),
    linear-gradient(180deg, #05080c 0%, #04070a 76%, #070b10 100%);
}

.stage-celestial {
  position: absolute;
  inset: 0;
  z-index: -3;
  overflow: hidden;
  pointer-events: none;
}

.stage-celestial::before {
  content: "";
  position: absolute;
  top: 48%;
  left: 46%;
  width: min(74vw, 940px);
  height: min(52vw, 680px);
  transform: translate(-50%, -50%) rotate(-7deg);
  border-radius: 50%;
  background:
    radial-gradient(ellipse, rgba(170, 190, 202, 0.09), transparent 56%),
    radial-gradient(ellipse at 50% 60%, rgba(77, 106, 130, 0.16), transparent 64%);
  filter: blur(24px);
}

.stage-celestial::after {
  content: "";
  position: absolute;
  top: -22%;
  right: -7%;
  width: 58vw;
  height: 65vw;
  border-radius: 50%;
  background:
    radial-gradient(circle at 45% 30%, rgba(203, 171, 112, 0.06), transparent 31%),
    radial-gradient(circle at 60% 55%, rgba(73, 113, 146, 0.08), transparent 49%);
  filter: blur(46px);
}

.stage-grid {
  position: absolute;
  inset: 0;
  z-index: -2;
  pointer-events: none;
  opacity: 0.12;
  background-image:
    linear-gradient(to right, rgba(255, 255, 255, 0.055) 1px, transparent 1px),
    linear-gradient(to bottom, rgba(255, 255, 255, 0.055) 1px, transparent 1px);
  background-size: 72px 72px;
  mask-image: radial-gradient(ellipse at 48% 50%, black 0, transparent 74%);
}

#systemCanvas {
  position: absolute;
  inset: 0;
  width: 100%;
  height: 100%;
  z-index: 0;
  touch-action: manipulation;
}

.stage-grain {
  position: absolute;
  inset: 0;
  z-index: 2;
  pointer-events: none;
  opacity: 0.18;
  mix-blend-mode: soft-light;
  background-image: url("data:image/svg+xml,%3Csvg viewBox='0 0 180 180' xmlns='http://www.w3.org/2000/svg'%3E%3Cfilter id='n'%3E%3CfeTurbulence type='fractalNoise' baseFrequency='.88' numOctaves='3' stitchTiles='stitch'/%3E%3C/filter%3E%3Crect width='100%25' height='100%25' filter='url(%23n)' opacity='.35'/%3E%3C/svg%3E");
}

.stage-vignette {
  position: absolute;
  inset: 0;
  z-index: 3;
  pointer-events: none;
  background:
    linear-gradient(90deg, rgba(4, 7, 10, 0.76) 0, transparent 13%, transparent 70%, rgba(4, 7, 10, 0.66) 100%),
    linear-gradient(0deg, rgba(4, 7, 10, 0.88) 0, transparent 18%, transparent 92%, rgba(4, 7, 10, 0.48) 100%);
}

.stage-corner {
  position: absolute;
  z-index: 4;
  width: 16px;
  height: 16px;
  pointer-events: none;
  opacity: 0.5;
}

.stage-corner::before,
.stage-corner::after {
  content: "";
  position: absolute;
  background: var(--ink);
}

.stage-corner::before {
  width: 16px;
  height: 1px;
}

.stage-corner::after {
  width: 1px;
  height: 16px;
}

.stage-corner-tl {
  top: 22px;
  left: 24px;
}

.stage-corner-tr {
  top: 22px;
  right: 24px;
  transform: rotate(90deg);
}

.stage-corner-bl {
  bottom: 22px;
  left: 24px;
  transform: rotate(-90deg);
}

.stage-corner-br {
  right: 24px;
  bottom: 22px;
  transform: rotate(180deg);
}

.hero-wordmark {
  position: absolute;
  top: 20%;
  left: 4.7%;
  z-index: 4;
  display: grid;
  width: min(41vw, 580px);
  pointer-events: none;
  color: rgba(244, 241, 233, 0.18);
  line-height: 0.78;
  text-transform: uppercase;
}

.hero-wordmark-the {
  margin-bottom: 11px;
  padding-left: 5px;
  color: rgba(244, 241, 233, 0.42);
  font-family: var(--mono);
  font-size: 9px;
  font-style: normal;
  letter-spacing: 0.52em;
}

.hero-wordmark-main {
  font-family: var(--display);
  font-size: clamp(74px, 8.6vw, 146px);
  font-weight: 400;
  letter-spacing: -0.07em;
  white-space: nowrap;
}

.hero-wordmark-edition {
  margin-top: 25px;
  padding-left: 8px;
  color: rgba(244, 241, 233, 0.24);
  font-family: var(--mono);
  font-size: 8px;
  letter-spacing: 0.25em;
}

.view-caption {
  position: absolute;
  top: 38px;
  left: 34px;
  z-index: 7;
  max-width: 390px;
}

.section-code {
  margin: 0;
  color: var(--gold);
  font-family: var(--mono);
  font-size: 9px;
  font-weight: 500;
  letter-spacing: 0.17em;
  text-transform: uppercase;
}

.view-caption h1 {
  display: grid;
  gap: 8px;
  margin: 14px 0 0;
  font-weight: 400;
}

.view-title {
  font-family: var(--display);
  font-size: clamp(30px, 3vw, 45px);
  letter-spacing: 0.02em;
  line-height: 1;
}

.view-subtitle {
  color: var(--muted);
  font-family: var(--sans);
  font-size: 11px;
  font-weight: 400;
  letter-spacing: 0.09em;
}

.coordinate-readout {
  position: absolute;
  top: 43px;
  right: 392px;
  z-index: 5;
  display: flex;
  gap: 18px;
  color: var(--faint);
  font-family: var(--mono);
  font-size: 8px;
  letter-spacing: 0.12em;
}

.planet-hotspots {
  position: absolute;
  inset: 0;
  z-index: 6;
  pointer-events: none;
}

.planet-hotspot {
  position: absolute;
  display: grid;
  place-items: center;
  min-width: 44px;
  min-height: 44px;
  padding: 0;
  transform: translate(-50%, -50%);
  border: 0;
  border-radius: 50%;
  background: transparent;
  pointer-events: auto;
  transition: opacity 160ms ease;
}

.planet-hotspot::before {
  content: "";
  position: absolute;
  width: calc(100% + 8px);
  height: calc(100% + 8px);
  border: 1px solid transparent;
  border-radius: 50%;
  transition:
    border-color 180ms ease,
    transform 180ms var(--ease-out);
}

.planet-hotspot::after {
  content: attr(data-label);
  position: absolute;
  left: 50%;
  bottom: calc(100% + 7px);
  padding: 5px 8px 4px;
  transform: translate(-50%, 4px);
  border: 1px solid var(--line);
  background: rgba(6, 10, 14, 0.92);
  color: var(--ink);
  font-family: var(--mono);
  font-size: 8px;
  letter-spacing: 0.11em;
  line-height: 1;
  white-space: nowrap;
  opacity: 0;
  pointer-events: none;
  transition:
    opacity 150ms ease,
    transform 180ms var(--ease-out);
}

.planet-hotspot:hover::before,
.planet-hotspot:focus-visible::before,
.planet-hotspot[aria-pressed="true"]::before {
  border-color: rgba(244, 241, 233, 0.58);
}

.planet-hotspot:hover::after,
.planet-hotspot:focus-visible::after {
  opacity: 1;
  transform: translate(-50%, 0);
}

.body-rail {
  position: absolute;
  top: 130px;
  left: 34px;
  z-index: 8;
  display: grid;
  gap: 2px;
  width: 110px;
}

.rail-button {
  position: relative;
  display: grid;
  grid-template-columns: 19px 9px 1fr;
  align-items: center;
  gap: 7px;
  min-height: 36px;
  padding: 0 8px;
  border: 0;
  background: transparent;
  color: var(--faint);
  text-align: left;
  transition:
    color 160ms ease,
    background-color 160ms ease;
}

.rail-button::before {
  content: "";
  position: absolute;
  inset: 7px 2px 7px 0;
  border-left: 1px solid transparent;
  transition: border-color 160ms ease;
}

.rail-button:hover,
.rail-button[aria-pressed="true"] {
  background: linear-gradient(90deg, rgba(255, 255, 255, 0.055), transparent);
  color: var(--ink);
}

.rail-button[aria-pressed="true"]::before {
  border-color: var(--body-dot, var(--gold));
}

.rail-index {
  color: currentColor;
  font-family: var(--mono);
  font-size: 8px;
  letter-spacing: 0.05em;
  opacity: 0.7;
}

.rail-dot {
  width: 6px;
  height: 6px;
  border-radius: 50%;
  background: var(--body-dot);
  box-shadow: 0 0 8px color-mix(in srgb, var(--body-dot) 65%, transparent);
}

.rail-name {
  font-size: 11px;
  letter-spacing: 0.12em;
}

.focus-card {
  position: absolute;
  top: 112px;
  right: 32px;
  bottom: 118px;
  z-index: 10;
  display: flex;
  flex-direction: column;
  width: 334px;
  padding: 20px 22px;
  overflow: auto;
  border: 1px solid var(--line);
  background:
    linear-gradient(145deg, rgba(20, 28, 36, 0.9), rgba(7, 11, 16, 0.84)),
    var(--surface);
  box-shadow: 0 28px 80px rgba(0, 0, 0, 0.34);
  backdrop-filter: blur(22px) saturate(130%);
  scrollbar-width: thin;
  scrollbar-color: var(--line-strong) transparent;
}

.focus-card::before {
  content: "";
  position: absolute;
  top: -1px;
  left: -1px;
  width: 62px;
  height: 1px;
  background: var(--body-color);
  box-shadow: 0 0 12px color-mix(in srgb, var(--body-color) 55%, transparent);
}

.focus-card-top {
  display: flex;
  align-items: center;
  justify-content: space-between;
  gap: 12px;
  padding-bottom: 16px;
  border-bottom: 1px solid var(--line);
  color: var(--faint);
  font-family: var(--mono);
  font-size: 8px;
  letter-spacing: 0.14em;
  text-transform: uppercase;
}

.focus-card-top span:first-child {
  color: var(--ink-soft);
}

.focus-heading {
  display: grid;
  grid-template-columns: 82px 1fr;
  align-items: center;
  gap: 17px;
  padding: 18px 0 14px;
}

.focus-orb {
  position: relative;
  width: 78px;
  height: 78px;
  border-radius: 50%;
  background:
    radial-gradient(circle at 31% 26%, rgba(255, 255, 255, 0.93), transparent 8%),
    radial-gradient(circle at 34% 29%, var(--orb-hi), var(--orb-mid) 52%, var(--orb-low) 78%, #020406 100%);
  box-shadow:
    inset -18px -10px 22px rgba(0, 0, 0, 0.72),
    inset 4px 3px 10px rgba(255, 255, 255, 0.13),
    0 0 34px color-mix(in srgb, var(--body-color) 22%, transparent);
  transition:
    transform 500ms var(--ease-out),
    box-shadow 500ms ease,
    background 500ms ease;
}

.focus-orb::before {
  content: "";
  position: absolute;
  inset: 0;
  overflow: hidden;
  border-radius: inherit;
  opacity: 0.26;
  background:
    repeating-linear-gradient(
      -12deg,
      transparent 0 7px,
      rgba(255, 255, 255, 0.15) 8px,
      transparent 10px
    );
  mix-blend-mode: overlay;
}

.focus-orb::after {
  content: "";
  position: absolute;
  inset: 12%;
  border-radius: 50%;
  background: radial-gradient(circle at 40% 24%, transparent, rgba(0, 0, 0, 0.32) 76%);
}

.focus-orb-sheen {
  position: absolute;
  top: 10%;
  left: 20%;
  z-index: 2;
  width: 28%;
  height: 16%;
  transform: rotate(-27deg);
  border-radius: 50%;
  background: rgba(255, 255, 255, 0.18);
  filter: blur(4px);
}

.focus-orb[data-has-ring="true"]::after {
  inset: auto;
  top: 44%;
  left: -21%;
  z-index: -1;
  width: 142%;
  height: 23%;
  transform: rotate(-14deg);
  border: 7px solid rgba(220, 206, 176, 0.52);
  border-left-width: 3px;
  border-right-width: 3px;
  background: transparent;
  box-shadow: 0 1px 0 rgba(255, 255, 255, 0.2);
}

.focus-orb[data-body="sun"] {
  background:
    radial-gradient(circle at 48% 45%, #fffce0, #ffd76e 31%, #f49132 59%, #ca3f1d 82%, #5b1309);
  box-shadow:
    inset -12px -8px 22px rgba(106, 22, 4, 0.28),
    0 0 26px rgba(255, 180, 74, 0.56),
    0 0 64px rgba(255, 130, 42, 0.23);
}

.focus-title {
  min-width: 0;
}

.focus-en {
  margin: 0 0 5px;
  color: var(--faint);
  font-family: var(--mono);
  font-size: 8px;
  letter-spacing: 0.19em;
}

.focus-name {
  margin: 0;
  font-family: var(--display);
  font-size: 44px;
  font-weight: 400;
  letter-spacing: 0.01em;
  line-height: 1;
}

.focus-copy {
  min-height: 87px;
  margin: 0;
  padding-bottom: 17px;
  color: var(--muted);
  font-size: 12px;
  line-height: 1.72;
}

.focus-facts {
  display: grid;
  gap: 0;
  margin: 0;
  border-top: 1px solid var(--line);
}

.fact-row {
  display: flex;
  align-items: baseline;
  justify-content: space-between;
  gap: 18px;
  min-height: 38px;
  padding: 9px 0;
  border-bottom: 1px solid var(--line);
}

.fact-label {
  color: var(--faint);
  font-size: 10px;
  letter-spacing: 0.06em;
}

.fact-value {
  margin: 0;
  color: var(--ink-soft);
  font-family: var(--mono);
  font-size: 10px;
  text-align: right;
}

.composition-block {
  padding: 17px 0 16px;
}

.composition-head {
  display: flex;
  align-items: baseline;
  justify-content: space-between;
  gap: 14px;
  margin-bottom: 9px;
  color: var(--faint);
  font-size: 9px;
  letter-spacing: 0.05em;
}

.composition-head span:last-child {
  color: var(--ink-soft);
  font-family: var(--mono);
  font-size: 8px;
}

.composition-bar {
  display: flex;
  gap: 2px;
  height: 5px;
  overflow: hidden;
  background: rgba(255, 255, 255, 0.06);
}

.composition-segment {
  min-width: 2px;
  height: 100%;
}

.focus-card-foot {
  display: flex;
  align-items: center;
  justify-content: space-between;
  gap: 12px;
  margin-top: auto;
  padding-top: 14px;
  border-top: 1px solid var(--line);
}

.focus-fact {
  color: var(--faint);
  font-size: 9px;
  letter-spacing: 0.08em;
}

.focus-nav {
  display: flex;
  gap: 2px;
}

.focus-nav button {
  width: 38px;
  height: 38px;
  padding: 0;
  border: 1px solid var(--line);
  background: rgba(255, 255, 255, 0.025);
  transition:
    border-color 160ms ease,
    background-color 160ms ease;
}

.focus-nav button:hover {
  border-color: var(--line-strong);
  background: rgba(255, 255, 255, 0.07);
}

.focus-nav svg {
  width: 16px;
  height: 16px;
  fill: none;
  stroke: currentColor;
  stroke-width: 1.4;
  vertical-align: middle;
}

.stage-hint {
  position: absolute;
  bottom: 146px;
  left: 50%;
  z-index: 6;
  display: flex;
  align-items: center;
  gap: 10px;
  transform: translateX(-50%);
  color: var(--faint);
  font-size: 9px;
  letter-spacing: 0.06em;
  white-space: nowrap;
  pointer-events: none;
}

.hint-line {
  width: 28px;
  height: 1px;
  background: var(--line-strong);
}

.simulation-panel {
  position: absolute;
  right: 394px;
  bottom: 27px;
  left: 32px;
  z-index: 11;
  display: grid;
  grid-template-columns: 46px minmax(240px, 1fr) auto auto;
  align-items: center;
  gap: 16px;
  min-height: 78px;
  padding: 13px 16px;
  border: 1px solid var(--line);
  background: rgba(7, 11, 16, 0.76);
  backdrop-filter: blur(18px) saturate(120%);
}

.play-button {
  display: grid;
  place-items: center;
  width: 46px;
  height: 46px;
  padding: 0;
  border: 1px solid var(--line-strong);
  border-radius: 50%;
  background: rgba(255, 255, 255, 0.035);
  transition:
    border-color 160ms ease,
    background-color 160ms ease,
    transform 160ms ease;
}

.play-button:hover {
  border-color: var(--gold);
  background: rgba(228, 181, 107, 0.08);
}

.play-button:active {
  transform: scale(0.95);
}

.play-button svg {
  width: 19px;
  height: 19px;
  fill: none;
  stroke: currentColor;
  stroke-width: 1.6;
}

.play-button .play-icon {
  display: none;
  fill: currentColor;
  stroke: none;
}

.play-button.is-paused .pause-icon {
  display: none;
}

.play-button.is-paused .play-icon {
  display: block;
}

.time-control {
  min-width: 0;
}

.time-control-top {
  display: flex;
  align-items: center;
  justify-content: space-between;
  gap: 18px;
  margin-bottom: 5px;
}

.time-control label {
  color: var(--faint);
  font-size: 9px;
  letter-spacing: 0.08em;
}

.time-control output {
  color: var(--ink-soft);
  font-family: var(--mono);
  font-size: 10px;
  letter-spacing: 0.09em;
}

input[type="range"] {
  display: block;
  width: 100%;
  height: 20px;
  margin: 0;
  padding: 0;
  appearance: none;
  background: transparent;
  cursor: ew-resize;
}

input[type="range"]::-webkit-slider-runnable-track {
  height: 1px;
  background: linear-gradient(
    90deg,
    var(--gold) 0,
    var(--gold) var(--range-progress, 50%),
    var(--line-strong) var(--range-progress, 50%),
    var(--line-strong) 100%
  );
}

input[type="range"]::-moz-range-track {
  height: 1px;
  background: var(--line-strong);
}

input[type="range"]::-moz-range-progress {
  height: 1px;
  background: var(--gold);
}

input[type="range"]::-webkit-slider-thumb {
  width: 13px;
  height: 13px;
  margin-top: -6px;
  appearance: none;
  border: 2px solid var(--bg);
  border-radius: 50%;
  background: var(--gold-bright);
  box-shadow: 0 0 0 1px var(--gold);
}

input[type="range"]::-moz-range-thumb {
  width: 11px;
  height: 11px;
  border: 2px solid var(--bg);
  border-radius: 50%;
  background: var(--gold-bright);
  box-shadow: 0 0 0 1px var(--gold);
}

.range-labels {
  display: flex;
  align-items: center;
  justify-content: space-between;
  margin-top: -1px;
  color: var(--faint);
  font-family: var(--mono);
  font-size: 7px;
  letter-spacing: 0.08em;
}

.range-labels span:nth-child(2) {
  color: var(--gold);
}

.speed-control {
  display: flex;
  align-items: center;
  gap: 2px;
  padding: 3px;
  border: 1px solid var(--line);
}

.speed-button,
.today-button {
  min-height: 34px;
  padding: 0 10px;
  border: 0;
  background: transparent;
  color: var(--faint);
  font-size: 9px;
  white-space: nowrap;
  transition:
    color 160ms ease,
    background-color 160ms ease;
}

.speed-button:hover,
.today-button:hover {
  color: var(--ink);
  background: rgba(255, 255, 255, 0.05);
}

.speed-button.is-active {
  background: rgba(228, 181, 107, 0.12);
  color: var(--gold-bright);
}

.today-button {
  min-height: 42px;
  padding: 0 14px;
  border: 1px solid var(--line);
}

.reading-strip {
  display: grid;
  grid-template-columns: minmax(120px, 0.7fr) minmax(340px, 2.2fr) minmax(300px, 1fr);
  gap: 42px;
  align-items: start;
  padding: 38px max(32px, 5vw);
  border-bottom: 1px solid var(--line);
  background: #080c11;
}

.reading-index {
  margin: 0;
  color: var(--gold);
  font-family: var(--mono);
  font-size: 9px;
  letter-spacing: 0.14em;
}

.reading-copy {
  max-width: 690px;
  margin: 0;
  color: var(--ink-soft);
  font-size: 13px;
  line-height: 1.8;
}

.reading-stats {
  display: flex;
  justify-content: flex-end;
  gap: 28px;
}

.reading-stats span {
  display: grid;
  gap: 2px;
  color: var(--faint);
  font-size: 9px;
  letter-spacing: 0.08em;
  text-align: right;
  white-space: nowrap;
}

.reading-stats strong {
  color: var(--ink);
  font-family: var(--display);
  font-size: 30px;
  font-weight: 400;
  line-height: 1;
}

.archive-section {
  padding: clamp(76px, 9vw, 138px) max(28px, 5vw);
  background:
    radial-gradient(ellipse at 75% 0, rgba(51, 82, 105, 0.12), transparent 32rem),
    #05080c;
}

.archive-header {
  display: grid;
  grid-template-columns: 1fr minmax(340px, 0.75fr);
  align-items: end;
  gap: 40px;
  padding-bottom: 42px;
  border-bottom: 1px solid var(--line);
}

.archive-header h2,
.method-heading h2 {
  margin: 14px 0 0;
  font-family: var(--display);
  font-size: clamp(44px, 6vw, 84px);
  font-weight: 400;
  letter-spacing: -0.03em;
  line-height: 0.95;
}

.archive-header > p {
  max-width: 520px;
  margin: 0 0 4px;
  color: var(--muted);
  font-size: 12px;
  line-height: 1.8;
}

.archive-grid {
  display: grid;
  grid-template-columns: repeat(3, minmax(0, 1fr));
  border-left: 1px solid var(--line);
}

.archive-card {
  position: relative;
  display: grid;
  min-height: 345px;
  padding: 22px 24px 25px;
  overflow: hidden;
  border: 0;
  border-right: 1px solid var(--line);
  border-bottom: 1px solid var(--line);
  background: transparent;
  color: var(--ink);
  text-align: left;
  transition:
    background-color 280ms ease,
    color 180ms ease;
}

.archive-card::before {
  content: "";
  position: absolute;
  top: 0;
  right: 0;
  left: 0;
  height: 1px;
  transform: scaleX(0);
  transform-origin: left;
  background: var(--body-color);
  transition: transform 420ms var(--ease-out);
}

.archive-card:hover {
  background: rgba(255, 255, 255, 0.028);
}

.archive-card:hover::before,
.archive-card:focus-visible::before {
  transform: scaleX(1);
}

.archive-card-top {
  position: relative;
  z-index: 2;
  display: flex;
  align-items: flex-start;
  justify-content: space-between;
  gap: 16px;
}

.archive-card-index {
  color: var(--faint);
  font-family: var(--mono);
  font-size: 8px;
  letter-spacing: 0.1em;
}

.archive-card-type {
  color: var(--body-color);
  font-size: 8px;
  letter-spacing: 0.10em;
}

.archive-orbit {
  position: absolute;
  top: 72px;
  right: 18%;
  width: 190px;
  height: 190px;
  border: 1px solid rgba(255, 255, 255, 0.055);
  border-radius: 50%;
  pointer-events: none;
  transition:
    transform 650ms var(--ease-out),
    border-color 280ms ease;
}

.archive-orbit::before {
  content: "";
  position: absolute;
  top: 50%;
  left: 50%;
  width: 1px;
  height: 1px;
  border-radius: 50%;
  background: var(--body-color);
  box-shadow: 0 0 16px 4px var(--body-color);
}

.archive-card:hover .archive-orbit {
  transform: rotate(16deg) scale(1.03);
  border-color: rgba(255, 255, 255, 0.11);
}

.archive-orb {
  position: absolute;
  top: 118px;
  right: calc(18% + 62px);
  width: 66px;
  height: 66px;
  border-radius: 50%;
  background:
    radial-gradient(circle at 32% 27%, rgba(255, 255, 255, 0.84), transparent 7%),
    radial-gradient(circle at 34% 30%, var(--orb-hi), var(--orb-mid) 52%, var(--orb-low) 82%, #020406);
  box-shadow:
    inset -16px -11px 20px rgba(0, 0, 0, 0.73),
    0 0 26px color-mix(in srgb, var(--body-color) 18%, transparent);
  transition:
    transform 650ms var(--ease-out),
    box-shadow 300ms ease;
}

.archive-card:hover .archive-orb {
  transform: scale(1.08) translateY(-4px);
  box-shadow:
    inset -16px -11px 20px rgba(0, 0, 0, 0.7),
    0 0 42px color-mix(in srgb, var(--body-color) 30%, transparent);
}

.archive-orb[data-has-ring="true"]::after {
  content: "";
  position: absolute;
  top: 35%;
  left: -36%;
  width: 172%;
  height: 30%;
  border: 7px solid rgba(220, 206, 176, 0.45);
  border-left-width: 2px;
  border-right-width: 2px;
  border-radius: 50%;
  transform: rotate(-13deg);
}

.archive-body {
  align-self: end;
  position: relative;
  z-index: 2;
}

.archive-name-row {
  display: flex;
  align-items: flex-end;
  gap: 12px;
  margin-bottom: 13px;
}

.archive-name {
  margin: 0;
  font-family: var(--display);
  font-size: clamp(36px, 3.2vw, 52px);
  font-weight: 400;
  line-height: 0.9;
}

.archive-en {
  margin: 0 0 4px;
  color: var(--faint);
  font-family: var(--mono);
  font-size: 8px;
  letter-spacing: 0.14em;
}

.archive-description {
  max-width: 310px;
  min-height: 42px;
  margin: 0 0 18px;
  color: var(--muted);
  font-size: 11px;
  line-height: 1.65;
}

.archive-meta {
  display: flex;
  align-items: center;
  justify-content: space-between;
  padding-top: 12px;
  border-top: 1px solid var(--line);
  color: var(--faint);
  font-family: var(--mono);
  font-size: 8px;
  letter-spacing: 0.08em;
}

.archive-arrow {
  width: 17px;
  height: 17px;
  fill: none;
  stroke: currentColor;
  stroke-width: 1.2;
  transition: transform 260ms var(--ease-out);
}

.archive-card:hover .archive-arrow {
  transform: translate(3px, -3px);
}

.archive-card[data-body="sun"] .archive-orb {
  background:
    radial-gradient(circle at 46% 44%, #fffbe2, #ffd66e 32%, #f28b33 61%, #c83d1d 84%, #551207);
  box-shadow:
    inset -10px -6px 18px rgba(103, 18, 4, 0.2),
    0 0 26px rgba(255, 181, 80, 0.45),
    0 0 60px rgba(255, 120, 40, 0.2);
}

.method-section {
  display: grid;
  grid-template-columns: minmax(280px, 0.9fr) minmax(520px, 1.6fr);
  gap: 7vw;
  padding: clamp(80px, 10vw, 150px) max(28px, 6vw);
  border-top: 1px solid var(--line);
  background:
    radial-gradient(ellipse at 16% 50%, rgba(62, 92, 112, 0.10), transparent 33rem),
    #080c11;
}

.method-heading {
  align-self: start;
  position: sticky;
  top: 120px;
}

.method-list {
  border-top: 1px solid var(--line);
}

.method-list article {
  display: grid;
  grid-template-columns: 48px 1fr;
  column-gap: 22px;
  padding: 27px 0 34px;
  border-bottom: 1px solid var(--line);
}

.method-number {
  grid-row: span 2;
  color: var(--gold);
  font-family: var(--mono);
  font-size: 9px;
  letter-spacing: 0.08em;
}

.method-list h3 {
  margin: 0 0 10px;
  font-family: var(--display);
  font-size: 28px;
  font-weight: 400;
  letter-spacing: 0.01em;
}

.method-list p {
  max-width: 600px;
  margin: 0;
  color: var(--muted);
  font-size: 12px;
  line-height: 1.8;
}

.site-footer {
  display: grid;
  grid-template-columns: 1fr minmax(320px, 1.4fr) auto;
  align-items: end;
  gap: 34px;
  padding: 42px max(28px, 5vw) 52px;
  border-top: 1px solid var(--line);
  background: #040609;
}

.site-footer > div {
  display: flex;
  align-items: center;
  gap: 16px;
}

.footer-mark {
  display: grid;
  place-items: center;
  width: 42px;
  height: 42px;
  border: 1px solid var(--line-strong);
  border-radius: 50%;
  color: var(--gold);
  font-family: var(--mono);
  font-size: 9px;
  letter-spacing: 0.08em;
}

.site-footer p {
  margin: 0;
  color: var(--faint);
  font-size: 9px;
  line-height: 1.65;
  letter-spacing: 0.05em;
}

.source-note {
  max-width: 660px;
}

.site-footer > a {
  display: inline-flex;
  align-items: center;
  min-height: 44px;
  padding: 0 4px;
  border-bottom: 1px solid var(--line-strong);
  color: var(--ink-soft);
  font-size: 10px;
  letter-spacing: 0.08em;
  white-space: nowrap;
}

.site-footer > a:hover {
  border-color: var(--gold);
  color: var(--gold-bright);
}

@keyframes live-pulse {
  0%,
  100% {
    opacity: 0.45;
    transform: scale(0.9);
  }
  50% {
    opacity: 1;
    transform: scale(1.1);
  }
}

@media (max-width: 1180px) {
  .site-header {
    padding: 0 24px;
  }

  .brand-en,
  .status-time {
    display: none;
  }

  .focus-card {
    right: 24px;
    width: 310px;
  }

  .simulation-panel {
    right: 358px;
    left: 24px;
    grid-template-columns: 46px minmax(200px, 1fr) auto;
  }

  .today-button {
    display: none;
  }

  .coordinate-readout {
    right: 360px;
  }

  .view-caption,
  .body-rail {
    left: 26px;
  }

  .archive-grid {
    grid-template-columns: repeat(2, minmax(0, 1fr));
  }
}

@media (max-width: 880px) {
  .site-header {
    grid-template-columns: auto 1fr;
    gap: 14px;
    height: 64px;
    padding: 0 18px;
  }

  .brand-mark {
    width: 26px;
    height: 26px;
  }

  .brand-cn {
    font-size: 10px;
  }

  .mode-nav {
    justify-self: end;
    height: 64px;
  }

  .mode-button {
    min-width: auto;
    padding: 0 12px;
    font-size: 11px;
  }

  .mode-button span {
    display: none;
  }

  .mode-link {
    display: none;
  }

  .header-status {
    display: none;
  }

  .atlas-stage {
    height: auto;
    min-height: 0;
    max-height: none;
    padding-bottom: 22px;
  }

  #systemCanvas {
    height: 580px;
  }

  .stage-vignette {
    background:
      linear-gradient(0deg, rgba(4, 7, 10, 0.95) 34%, transparent 58%),
      linear-gradient(90deg, rgba(4, 7, 10, 0.26), transparent 24%, transparent 76%, rgba(4, 7, 10, 0.24));
  }

  .hero-wordmark {
    top: 20%;
    left: 6%;
    width: 88%;
  }

  .hero-wordmark-main {
    font-size: clamp(86px, 20vw, 150px);
  }

  .view-caption {
    top: 28px;
    left: 22px;
  }

  .coordinate-readout {
    display: none;
  }

  .body-rail {
    top: 304px;
    right: 18px;
    left: 18px;
    display: flex;
    gap: 2px;
    width: auto;
    overflow-x: auto;
    scrollbar-width: none;
  }

  .body-rail::-webkit-scrollbar {
    display: none;
  }

  .rail-button {
    flex: 1 0 44px;
    display: flex;
    justify-content: center;
    min-width: 44px;
    min-height: 44px;
    border: 1px solid var(--line);
    background: rgba(5, 8, 12, 0.38);
  }

  .rail-button::before,
  .rail-index,
  .rail-name {
    display: none;
  }

  .rail-button[aria-pressed="true"] {
    background: rgba(255, 255, 255, 0.09);
  }

  .focus-card {
    position: relative;
    top: auto;
    right: auto;
    bottom: auto;
    width: auto;
    margin: 414px 18px 0;
    padding: 20px;
  }

  .focus-copy {
    min-height: 0;
  }

  .stage-hint {
    display: none;
  }

  .simulation-panel {
    position: relative;
    right: auto;
    bottom: auto;
    left: auto;
    grid-template-columns: 46px minmax(0, 1fr) auto;
    margin: 14px 18px 0;
  }

  .today-button {
    display: block;
    grid-column: 1 / -1;
    width: 100%;
    min-height: 40px;
  }

  .reading-strip {
    grid-template-columns: 1fr;
    gap: 20px;
    padding: 34px 22px;
  }

  .reading-stats {
    justify-content: flex-start;
  }

  .reading-stats span {
    text-align: left;
  }

  .archive-section {
    padding-right: 18px;
    padding-left: 18px;
  }

  .archive-header {
    grid-template-columns: 1fr;
    gap: 22px;
  }

  .archive-grid {
    grid-template-columns: repeat(2, minmax(0, 1fr));
  }

  .method-section {
    grid-template-columns: 1fr;
    gap: 44px;
    padding-right: 22px;
    padding-left: 22px;
  }

  .method-heading {
    position: static;
  }

  .site-footer {
    grid-template-columns: 1fr;
    gap: 24px;
    padding-right: 22px;
    padding-left: 22px;
  }
}

@media (max-width: 600px) {
  .brand-copy {
    display: none;
  }

  .site-header {
    gap: 8px;
    padding: 0 12px;
  }

  .mode-nav {
    width: 100%;
  }

  .mode-button {
    flex: 1;
    padding: 0 8px;
  }

  #systemCanvas {
    height: 560px;
  }

  .hero-wordmark {
    top: 24%;
    left: 20px;
  }

  .hero-wordmark-main {
    font-size: 25vw;
    line-height: 0.72;
  }

  .hero-wordmark-edition {
    margin-top: 20px;
  }

  .view-caption {
    left: 18px;
  }

  .view-title {
    font-size: 31px;
  }

  .view-subtitle {
    font-size: 10px;
  }

  .body-rail {
    top: 294px;
    padding: 0 2px;
  }

  .focus-card {
    margin: 380px 12px 0;
    padding: 18px 18px 16px;
  }

  .focus-heading {
    grid-template-columns: 72px 1fr;
    gap: 14px;
  }

  .focus-orb {
    width: 68px;
    height: 68px;
  }

  .focus-name {
    font-size: 40px;
  }

  .focus-card-top {
    padding-bottom: 13px;
  }

  .fact-row {
    min-height: 36px;
    padding: 8px 0;
  }

  .simulation-panel {
    grid-template-columns: 44px minmax(0, 1fr);
    gap: 12px;
    margin: 12px 12px 0;
    padding: 12px;
  }

  .play-button {
    width: 44px;
    height: 44px;
  }

  .speed-control {
    grid-column: 1 / -1;
    justify-self: stretch;
  }

  .speed-button {
    flex: 1;
    min-height: 40px;
  }

  .today-button {
    grid-column: 1 / -1;
    min-height: 40px;
  }

  .reading-stats {
    gap: 20px;
    justify-content: space-between;
  }

  .reading-stats strong {
    font-size: 26px;
  }

  .archive-grid {
    grid-template-columns: 1fr;
  }

  .archive-card {
    min-height: 295px;
    padding: 19px;
  }

  .archive-orbit {
    top: 58px;
    right: 13%;
    width: 164px;
    height: 164px;
  }

  .archive-orb {
    top: 101px;
    right: calc(13% + 51px);
    width: 60px;
    height: 60px;
  }

  .archive-name {
    font-size: 43px;
  }

  .archive-description {
    min-height: 0;
  }

  .method-list article {
    grid-template-columns: 34px 1fr;
    column-gap: 12px;
  }
}

@media (max-width: 370px) {
  .view-subtitle {
    max-width: 220px;
    line-height: 1.7;
  }

  .mode-button {
    font-size: 10px;
  }

  .focus-card {
    margin-right: 9px;
    margin-left: 9px;
  }
}

@media (prefers-reduced-motion: reduce) {
  html {
    scroll-behavior: auto;
  }

  *,
  *::before,
  *::after {
    scroll-behavior: auto !important;
    animation-duration: 0.01ms !important;
    animation-iteration-count: 1 !important;
    transition-duration: 0.01ms !important;
  }
}