:root {
  color-scheme: dark;
  --bg: #02050a;
  --panel: rgba(5, 11, 17, 0.66);
  --panel-strong: rgba(6, 14, 21, 0.86);
  --panel-soft: rgba(10, 24, 34, 0.5);
  --line: rgba(205, 231, 239, 0.14);
  --line-strong: rgba(205, 231, 239, 0.32);
  --text: #f0f8fa;
  --muted: #9bb2bb;
  --cyan: #5bd5ff;
  --amber: #ffb45f;
  --green: #70d88b;
  --danger: #ff7d7d;
  --radius: 8px;
  font-family: Inter, ui-sans-serif, system-ui, -apple-system, BlinkMacSystemFont, "Segoe UI", "Noto Sans TC", sans-serif;
}

* {
  box-sizing: border-box;
}

html,
body {
  min-width: 320px;
  min-height: 100%;
  margin: 0;
  overflow-x: hidden;
  background: var(--bg);
  color: var(--text);
}

body {
  min-height: 100dvh;
}

button,
a {
  font: inherit;
}

button {
  border: 1px solid var(--line);
  border-radius: var(--radius);
  color: var(--text);
  background: rgba(255, 255, 255, 0.05);
  cursor: pointer;
}

button:hover:not(:disabled),
button:focus-visible {
  border-color: var(--line-strong);
  background: rgba(91, 213, 255, 0.12);
}

button:focus-visible,
a:focus-visible {
  outline: 2px solid var(--cyan);
  outline-offset: 3px;
}

button:disabled {
  cursor: not-allowed;
  opacity: 0.45;
}

h1,
h2,
p {
  margin-top: 0;
}

.app-shell {
  position: relative;
  min-height: 100dvh;
  overflow-x: hidden;
  isolation: isolate;
  background:
    linear-gradient(115deg, rgba(6, 18, 28, 0.82) 0%, rgba(2, 5, 10, 0.28) 40%, rgba(3, 9, 12, 0.78) 100%),
    linear-gradient(180deg, rgba(2, 5, 10, 0.12) 0%, rgba(2, 5, 10, 0.52) 78%, #02050a 100%);
}

#space-canvas {
  position: fixed;
  inset: 0;
  z-index: 0;
  display: block;
  width: 100vw;
  height: 100dvh;
  touch-action: none;
  background: #02050a;
}

.top-bar {
  position: fixed;
  z-index: 9;
  top: 0;
  left: 0;
  right: 0;
  display: flex;
  align-items: center;
  justify-content: space-between;
  gap: 16px;
  min-height: 68px;
  padding: 14px max(20px, env(safe-area-inset-right)) 14px max(20px, env(safe-area-inset-left));
  border-bottom: 1px solid var(--line);
  background: rgba(2, 5, 10, 0.64);
  backdrop-filter: blur(14px);
}

.brand {
  min-width: 0;
  color: var(--text);
  text-decoration: none;
  font-size: 15px;
  font-weight: 760;
  letter-spacing: 0;
  text-transform: none;
}

:lang(zh-Hant) .brand {
  font-size: 16px;
}

.top-actions {
  display: inline-flex;
  flex: 0 0 auto;
  align-items: center;
  gap: 12px;
}

.about-link {
  position: fixed;
  right: max(20px, env(safe-area-inset-right));
  bottom: max(20px, env(safe-area-inset-bottom));
  z-index: 6;
  min-height: 30px;
  padding: 0;
  border: 0;
  background: transparent;
  color: rgba(220, 233, 235, 0.42);
  font-size: 11px;
  font-weight: 650;
  letter-spacing: 0;
  text-decoration: underline;
  text-underline-offset: 4px;
  text-transform: none;
}

.about-link:hover:not(:disabled),
.about-link:focus-visible {
  background: transparent;
  color: rgba(220, 233, 235, 0.82);
}

.language-toggle {
  position: relative;
  display: inline-flex;
  flex: 0 0 auto;
  align-items: center;
}

.language-menu__trigger {
  display: inline-flex;
  align-items: center;
  justify-content: center;
  gap: 7px;
  min-width: 58px;
  min-height: 32px;
  padding: 0 11px;
  border-color: var(--line);
  background: rgba(255, 255, 255, 0.025);
  color: rgba(220, 233, 235, 0.86);
  font-size: 13px;
  font-weight: 680;
}

.language-menu__trigger::after {
  content: "";
  width: 6px;
  height: 6px;
  margin-top: -3px;
  border-right: 1px solid currentColor;
  border-bottom: 1px solid currentColor;
  opacity: 0.7;
  transform: rotate(45deg);
}

.language-toggle[data-open="true"] .language-menu__trigger {
  border-color: rgba(205, 231, 239, 0.28);
  background: rgba(205, 231, 239, 0.08);
}

.language-toggle[data-open="true"] .language-menu__trigger::after {
  margin-top: 3px;
  transform: rotate(225deg);
}

.language-menu {
  position: absolute;
  top: calc(100% + 8px);
  right: 0;
  z-index: 8;
  display: grid;
  min-width: 108px;
  padding: 5px;
  border: 1px solid rgba(205, 231, 239, 0.16);
  border-radius: var(--radius);
  background: rgba(5, 11, 17, 0.94);
  box-shadow: 0 14px 34px rgba(0, 0, 0, 0.28);
  backdrop-filter: blur(14px);
}

.language-menu[hidden] {
  display: none;
}

.language-menu__option {
  display: flex;
  align-items: center;
  justify-content: flex-start;
  min-height: 34px;
  padding: 0 10px;
  border-color: transparent;
  background: transparent;
  color: var(--muted);
  font-size: 13px;
  text-align: left;
}

.language-menu__option:hover:not(:disabled),
.language-menu__option:focus-visible {
  border-color: transparent;
  background: rgba(205, 231, 239, 0.08);
  color: var(--text);
}

.language-menu__option[aria-checked="true"] {
  color: var(--text);
  background: rgba(205, 231, 239, 0.12);
}

.about-dialog {
  width: min(520px, calc(100vw - 36px));
  padding: 0;
  border: 1px solid rgba(205, 231, 239, 0.16);
  border-radius: var(--radius);
  background: rgba(4, 10, 15, 0.94);
  color: var(--text);
  box-shadow: 0 24px 90px rgba(0, 0, 0, 0.48);
  backdrop-filter: blur(18px);
}

.about-dialog::backdrop {
  background: rgba(0, 0, 0, 0.62);
}

.about-dialog__surface {
  position: relative;
  padding: 28px;
}

.about-dialog__header {
  display: flex;
  align-items: center;
  gap: 16px;
  margin: 0 40px 18px 0;
}

.about-dialog__mark {
  flex: 0 0 auto;
  width: 72px;
  height: 72px;
  object-fit: cover;
  border-radius: 16px;
}

.about-dialog__close {
  position: absolute;
  top: 14px;
  right: 14px;
  display: inline-flex;
  align-items: center;
  justify-content: center;
  width: 32px;
  height: 32px;
  padding: 0;
  border-color: rgba(205, 231, 239, 0.14);
  background: rgba(255, 255, 255, 0.04);
  color: var(--muted);
  font-size: 22px;
  line-height: 1;
}

.about-dialog__title {
  display: grid;
  gap: 3px;
  margin: 0;
  font-size: 30px;
  line-height: 1;
  letter-spacing: 0;
}

.about-dialog__title span:first-child {
  color: var(--muted);
  font-size: 13px;
  font-weight: 680;
  letter-spacing: 0.08em;
  text-transform: uppercase;
}

.about-dialog__body {
  display: grid;
  gap: 12px;
}

.about-dialog__body p,
.about-dialog__updated {
  margin: 0;
  color: rgba(220, 235, 237, 0.9);
  line-height: 1.58;
}

.about-dialog__updated {
  margin-top: 18px;
  color: var(--muted);
  font-size: 13px;
}

.about-dialog__contact {
  display: inline-flex;
  width: max-content;
  margin-top: 18px;
  color: rgba(220, 235, 237, 0.9);
  font-size: inherit;
  font-weight: 400;
  line-height: 1.58;
  text-decoration: underline;
  text-underline-offset: 4px;
}

.hero-copy {
  position: relative;
  z-index: 2;
  width: min(690px, calc(100vw - 56px));
  padding: 128px 0 0 32px;
  pointer-events: none;
}

.hero-copy__content {
  pointer-events: auto;
}

.hero-copy__kicker {
  margin-bottom: 8px;
  color: rgba(220, 235, 237, 0.72);
  font-size: 13px;
  font-weight: 680;
  letter-spacing: 0;
  text-transform: none;
  transform: none;
}

:lang(en) .hero-copy__kicker {
  font-size: 13px;
}

.hero-copy h1 {
  max-width: 15ch;
  margin-bottom: 18px;
  font-size: clamp(42px, 5.8vw, 78px);
  line-height: 1;
  letter-spacing: 0;
  text-wrap: balance;
}

.hero-copy__subtitle {
  max-width: 56ch;
  margin-bottom: 14px;
  color: rgba(220, 235, 237, 0.88);
  font-size: clamp(17px, 1.55vw, 21px);
  line-height: 1.42;
}

.hero-copy__prompt {
  max-width: 52ch;
  margin-bottom: 0;
  color: var(--muted);
  line-height: 1.66;
}

.hero-copy__actions {
  display: flex;
  flex-wrap: wrap;
  gap: 10px;
  margin-top: 24px;
}

.hero-action {
  min-height: 42px;
  padding: 0 15px;
  background: rgba(5, 13, 18, 0.76);
  backdrop-filter: blur(14px);
}

.hero-action--primary {
  border-color: transparent;
  color: #031015;
  background: var(--cyan);
}

.hero-action--primary:hover:not(:disabled),
.hero-action--primary:focus-visible {
  background: #8ce3ff;
}

.chapter-rail {
  position: fixed;
  z-index: 5;
  top: 68px;
  right: 0;
  left: 0;
  display: grid;
  grid-template-columns: minmax(0, 1fr) minmax(248px, 312px);
  gap: 12px;
  align-items: stretch;
  width: auto;
  padding: 0 max(20px, env(safe-area-inset-right)) 0 max(20px, env(safe-area-inset-left));
  border-bottom: 1px solid var(--line);
  background: rgba(2, 5, 10, 0.56);
  backdrop-filter: blur(14px);
}

.chapter-rail__buttons {
  display: grid;
  grid-template-columns: repeat(5, minmax(0, 1fr));
  min-width: 0;
}

.chapter-button {
  position: relative;
  min-height: 46px;
  padding: 0 10px;
  border-color: transparent;
  border-radius: 0;
  overflow-wrap: anywhere;
  text-align: center;
  background: transparent;
  color: rgba(220, 233, 235, 0.7);
  font-size: 13px;
  font-weight: 640;
  backdrop-filter: none;
}

.chapter-button::after {
  content: "";
  position: absolute;
  right: 18%;
  bottom: 0;
  left: 18%;
  height: 2px;
  border-radius: 999px;
  background: transparent;
  transform: scaleX(0.3);
  transition:
    background 160ms ease,
    transform 160ms ease;
}

.chapter-button:hover:not(:disabled),
.chapter-button:focus-visible {
  border-color: transparent;
  background: transparent;
  color: var(--text);
}

.chapter-button[aria-pressed="true"] {
  border-color: transparent;
  background: transparent;
  color: var(--text);
}

.chapter-button[aria-pressed="true"]::after {
  background: rgba(220, 235, 237, 0.86);
  transform: scaleX(1);
}

.audio-guide {
  display: flex;
  align-items: center;
  gap: 8px;
  min-width: 0;
  min-height: 46px;
  padding-left: 12px;
  border-left: 1px solid rgba(205, 231, 239, 0.14);
}

.audio-guide__label {
  flex: 0 0 auto;
  color: var(--muted);
  font-size: 11px;
  font-weight: 760;
  letter-spacing: 0;
  text-transform: none;
  white-space: nowrap;
}

.audio-guide__controls {
  display: grid;
  grid-template-columns: 68px minmax(0, 1fr);
  gap: 6px;
  flex: 1 1 auto;
  min-width: 0;
}

.audio-guide__button {
  min-height: 32px;
  padding: 0 8px;
  border-color: rgba(91, 213, 255, 0.24);
  color: #031015;
  background: var(--cyan);
  font-size: 12px;
  font-weight: 760;
}

.audio-guide__button:hover:not(:disabled),
.audio-guide__button:focus-visible {
  background: #8ce3ff;
}

.audio-guide__select {
  min-width: 0;
  width: 100%;
  min-height: 32px;
  padding: 0 28px 0 10px;
  border: 1px solid rgba(205, 231, 239, 0.16);
  border-radius: var(--radius);
  color: #dce9eb;
  background: rgba(255, 255, 255, 0.05);
  font: inherit;
  font-size: 12px;
}

.audio-guide__select option {
  color: #031015;
}

.audio-guide__status {
  display: none;
}

.node-panel {
  position: fixed;
  z-index: 4;
  top: 138px;
  right: 28px;
  width: min(408px, calc(100vw - 56px));
  max-height: calc(100dvh - 210px);
  overflow: auto;
  padding: 18px;
  border: 1px solid rgba(205, 231, 239, 0.14);
  border-radius: var(--radius);
  background: rgba(6, 14, 21, 0.82);
  box-shadow: 0 16px 42px rgba(0, 0, 0, 0.22);
  backdrop-filter: blur(14px);
}

.node-panel__header {
  display: flex;
  align-items: flex-start;
  justify-content: space-between;
  gap: 12px;
}

.node-panel__close {
  display: none;
}

.node-panel h2 {
  margin-bottom: 12px;
  font-size: 25px;
  line-height: 1.08;
  letter-spacing: 0;
}

.node-panel__tabs {
  display: grid;
  grid-template-columns: repeat(3, minmax(0, 1fr));
  gap: 6px;
  margin: 8px 0 15px;
}

.detail-tab {
  min-height: 34px;
  padding: 0 8px;
  overflow-wrap: anywhere;
  color: var(--muted);
  font-size: 12px;
}

.detail-tab[aria-pressed="true"] {
  border-color: rgba(205, 231, 239, 0.24);
  color: var(--text);
  background: rgba(205, 231, 239, 0.11);
}

.node-panel__body p,
.node-panel__body li {
  color: #d7e5e8;
  line-height: 1.58;
}

.node-panel__summary {
  margin-bottom: 0;
}

.node-panel__layer-intro {
  margin: 0 0 10px;
  color: rgba(215, 229, 232, 0.9);
}

.node-panel__body ul {
  display: grid;
  gap: 8px;
  margin: 0;
  padding-left: 19px;
}

.node-panel__metrics {
  margin: 15px 0 14px;
}

.node-panel__eyebrow {
  margin: 0 0 8px;
  color: var(--muted);
  font-size: 11px;
  font-weight: 760;
  letter-spacing: 0;
  text-transform: none;
}

.node-panel__metric-grid {
  display: grid;
  grid-template-columns: repeat(2, minmax(0, 1fr));
  gap: 8px;
}

.node-panel__metric {
  min-width: 0;
  padding: 10px;
  border: 1px solid rgba(91, 213, 255, 0.14);
  border-radius: 6px;
  background: rgba(91, 213, 255, 0.07);
}

.node-panel__metric strong {
  display: block;
  margin-bottom: 5px;
  color: var(--green);
  font-size: 20px;
  line-height: 1;
  overflow-wrap: anywhere;
}

.node-panel__metric span {
  display: block;
  color: rgba(215, 229, 232, 0.82);
  font-size: 12px;
  line-height: 1.42;
}

.node-panel__reality {
  margin: 16px 0 0;
  padding: 12px;
  border-left: 3px solid var(--amber);
  border-radius: 0 var(--radius) var(--radius) 0;
  background: rgba(255, 180, 95, 0.08);
}

.node-panel__disclosure {
  margin-top: 13px;
  border-top: 1px solid rgba(205, 231, 239, 0.14);
}

.node-panel__disclosure summary {
  min-height: 36px;
  padding: 10px 0 0;
  color: var(--cyan);
  cursor: pointer;
  font-size: 13px;
  font-weight: 720;
}

.node-panel__disclosure summary:hover {
  color: #8ce3ff;
}

.node-panel__disclosure-body {
  padding: 2px 0 0;
}

.node-panel__deep-dive {
  display: grid;
  gap: 10px;
}

.node-panel__deep-dive p {
  margin-bottom: 0;
}

.node-panel__future-signals {
  display: grid;
  gap: 8px;
  padding: 4px 0 0;
}

.node-panel__future-signals h3 {
  margin: 0;
  color: var(--green);
  font-size: 12px;
  line-height: 1.3;
  letter-spacing: 0;
}

.node-panel__future-signals p {
  margin-bottom: 0;
}

.node-panel__learning-list {
  display: grid;
  gap: 9px;
  padding-left: 0;
  list-style: none;
}

.node-panel__learning-card {
  display: grid;
  gap: 4px;
  padding: 10px;
  border: 1px solid rgba(112, 216, 139, 0.14);
  border-radius: 6px;
  background: rgba(112, 216, 139, 0.055);
}

.node-panel__learning-card a {
  color: #dce9eb;
  font-size: 13px;
  font-weight: 760;
  text-decoration: none;
}

.node-panel__learning-card a:hover {
  color: var(--green);
  text-decoration: underline;
  text-underline-offset: 3px;
}

.node-panel__learning-card small {
  color: var(--muted);
  font-size: 11px;
  line-height: 1.35;
}

.node-panel__learning-card p {
  margin: 0;
  color: rgba(215, 229, 232, 0.82);
  font-size: 12px;
  line-height: 1.48;
}

.node-panel__companies {
  display: grid;
  gap: 10px;
}

.node-panel__company-note {
  margin: 0;
  color: var(--muted);
  font-size: 12px;
  line-height: 1.48;
}

.node-panel__company-group {
  display: grid;
  gap: 7px;
}

.node-panel__company-group h3 {
  margin: 0;
  color: var(--green);
  font-size: 12px;
  line-height: 1.3;
  letter-spacing: 0;
}

.node-panel__company-list {
  display: grid;
  gap: 9px;
  margin: 0;
  padding-left: 0;
  list-style: none;
}

.node-panel__company {
  display: grid;
  gap: 4px;
  padding: 10px;
  border: 1px solid rgba(91, 213, 255, 0.14);
  border-radius: 6px;
  background: rgba(91, 213, 255, 0.06);
}

.node-panel__company a {
  color: #dce9eb;
  font-size: 13px;
  font-weight: 760;
  text-decoration: none;
}

.node-panel__company a:hover {
  color: var(--cyan);
  text-decoration: underline;
  text-underline-offset: 3px;
}

.node-panel__company p {
  margin: 0;
  color: rgba(215, 229, 232, 0.82);
  font-size: 12px;
  line-height: 1.48;
}

.node-panel__source-list {
  display: grid;
  gap: 10px;
  padding-left: 0;
  list-style: none;
}

.node-panel__disclosure--sources summary,
.node-panel__source-list,
.node-panel__source-list li,
.node-panel__source-list a,
.node-panel__source-list span,
.node-panel__source-list small {
  font-size: 12px;
}

.node-panel__source-list li {
  display: grid;
  gap: 3px;
}

.node-panel__source-list a,
.node-panel__source-list span {
  color: #dce9eb;
  font-weight: 680;
}

.node-panel__source-list a {
  text-decoration: none;
}

.node-panel__source-list a:hover {
  color: var(--cyan);
  text-decoration: underline;
  text-underline-offset: 3px;
}

.node-panel__source-list small {
  color: var(--muted);
  line-height: 1.45;
}

.node-panel__disclosure--latest summary {
  color: rgba(215, 229, 232, 0.72);
}

.node-panel__latest-signals {
  display: grid;
  gap: 10px;
  padding-top: 2px;
}

.node-panel__latest-intro,
.node-panel__latest-empty {
  margin: 0;
  color: var(--muted);
  font-size: 12px;
  line-height: 1.48;
}

.node-panel__latest-list {
  display: grid;
  gap: 12px;
  margin: 0;
  padding-left: 0;
  list-style: none;
}

.node-panel__latest-item {
  display: grid;
  gap: 4px;
  padding-top: 10px;
  border-top: 1px solid rgba(205, 231, 239, 0.1);
}

.node-panel__latest-meta {
  color: rgba(165, 183, 188, 0.72);
  font-family: ui-monospace, SFMono-Regular, Menlo, Monaco, Consolas, monospace;
  font-size: 10px;
  line-height: 1.35;
}

.node-panel__latest-item a {
  color: rgba(220, 233, 235, 0.92);
  font-size: 12px;
  font-weight: 720;
  line-height: 1.35;
  text-decoration: none;
}

.node-panel__latest-item a:hover {
  color: var(--cyan);
  text-decoration: underline;
  text-underline-offset: 3px;
}

.node-panel__latest-item p {
  margin: 0;
  color: rgba(215, 229, 232, 0.78);
  font-size: 12px;
  line-height: 1.48;
}

.node-panel__latest-item small {
  color: rgba(165, 183, 188, 0.88);
  font-size: 11px;
  line-height: 1.42;
}

.node-panel__latest-subscribe {
  justify-self: start;
  color: rgba(112, 216, 139, 0.9);
  font-size: 12px;
  font-weight: 720;
  text-decoration: none;
}

.node-panel__latest-subscribe:hover {
  color: var(--green);
  text-decoration: underline;
  text-underline-offset: 3px;
}

.fallback-view[hidden] {
  display: none;
}

.fallback-view {
  position: relative;
  z-index: 3;
  min-height: 100dvh;
  padding: 112px 28px 40px;
  background:
    linear-gradient(135deg, rgba(10, 25, 34, 0.94), rgba(2, 5, 10, 0.96)),
    #071015;
}

.fallback-view h2 {
  max-width: 720px;
  margin-bottom: 10px;
  font-size: clamp(34px, 6vw, 68px);
  line-height: 1;
}

.fallback-view p {
  max-width: 720px;
  color: #d7e5e8;
  line-height: 1.62;
}

.seo-noscript {
  position: relative;
  z-index: 3;
  max-width: 760px;
  padding: 24px 32px 56px;
  color: #d7e5e8;
  line-height: 1.62;
}

.seo-noscript h2 {
  margin-bottom: 10px;
  font-size: clamp(30px, 4vw, 54px);
  line-height: 1.04;
}

.seo-noscript ul {
  display: grid;
  gap: 8px;
  margin: 18px 0 0;
  padding-left: 20px;
}

.fallback-view__nodes {
  display: grid;
  grid-template-columns: repeat(auto-fit, minmax(180px, 1fr));
  gap: 10px;
  max-width: 960px;
  margin-top: 24px;
}

.fallback-node {
  min-height: 68px;
  padding: 12px;
  overflow-wrap: anywhere;
  text-align: left;
  background: var(--panel-soft);
}

.fallback-node[aria-pressed="true"] {
  border-color: rgba(112, 216, 139, 0.58);
  background: rgba(10, 45, 38, 0.82);
}

.mobile-scroll-steps {
  display: none;
}

.app-shell[data-mode="fallback"] #space-canvas,
.app-shell[data-mode="fallback"] .hero-copy,
.app-shell[data-mode="fallback"] .chapter-rail,
.app-shell[data-mode="fallback"] .node-panel,
.app-shell[data-mode="fallback"] .mobile-scroll-steps {
  display: none;
}

.app-shell[data-mode="fallback"] .fallback-view {
  z-index: 1;
}

@media (max-width: 1120px) and (min-width: 921px) {
  .hero-copy {
    width: min(560px, calc(100vw - 428px));
    padding-left: 24px;
  }

  .hero-copy h1 {
    font-size: clamp(40px, 6.2vw, 82px);
  }

  .hero-copy__subtitle,
  .hero-copy__prompt {
    max-width: 48ch;
  }

  .node-panel {
    right: 20px;
    width: 320px;
  }

  .chapter-rail {
    top: 68px;
    right: 0;
    left: 0;
    gap: 6px;
    grid-template-columns: minmax(0, 1fr) minmax(206px, 246px);
    padding-inline: 16px;
  }

  .audio-guide {
    padding-left: 8px;
  }

  .audio-guide__label {
    display: none;
  }

  .audio-guide__controls {
    grid-template-columns: 62px minmax(0, 1fr);
  }

  .chapter-button {
    min-height: 38px;
    padding: 6px 8px;
    font-size: 12px;
  }

}

@media (max-width: 920px) {
  html[data-atlas-mode="explore"] {
    scroll-snap-type: y proximity;
  }

  .top-bar {
    min-height: 62px;
    padding: 11px 16px;
  }

  .top-actions {
    gap: 8px;
  }

  .about-link {
    right: 16px;
    bottom: calc(86px + env(safe-area-inset-bottom));
    min-height: 28px;
    font-size: 10px;
  }

  .app-shell[data-mode="intro"] .about-link {
    bottom: calc(72px + env(safe-area-inset-bottom));
  }

  .app-shell[data-mode="fallback"] .about-link {
    bottom: max(18px, env(safe-area-inset-bottom));
  }

  .brand {
    font-size: 14px;
  }

  :lang(zh-Hant) .brand {
    font-size: 15px;
  }

  .hero-copy {
    width: calc(100vw - 32px);
    padding: 92px 16px 180px;
  }

  .app-shell[data-mode="explore"] .hero-copy {
    display: none;
  }

  .hero-copy h1 {
    max-width: 13ch;
    font-size: clamp(36px, 11vw, 66px);
  }

  .hero-copy__subtitle {
    position: fixed;
    z-index: 5;
    right: 16px;
    bottom: 92px;
    left: 16px;
    font-size: 17px;
    margin-bottom: 0;
    text-shadow: 0 2px 18px rgba(0, 0, 0, 0.7);
  }

  .hero-copy__prompt {
    display: none;
  }

  .hero-copy__actions {
    position: fixed;
    z-index: 5;
    right: 16px;
    bottom: max(22px, env(safe-area-inset-bottom));
    left: 16px;
    max-width: 100%;
    margin-top: 0;
  }

  .hero-action {
    max-width: 100%;
    white-space: normal;
  }

  .app-shell[data-mode="intro"] .chapter-rail,
  .app-shell[data-mode="intro"] .node-panel,
  .app-shell[data-mode="intro"] .mobile-scroll-steps {
    display: none;
  }

  .app-shell[data-mode="intro"] .hero-copy {
    min-height: 100dvh;
    padding-bottom: 32px;
  }

  .chapter-rail {
    top: auto;
    right: 16px;
    bottom: max(18px, env(safe-area-inset-bottom));
    left: 16px;
    display: block;
    width: auto;
    overflow: visible;
    padding: 0;
    border-bottom: 0;
    background: transparent;
    backdrop-filter: none;
  }

  .chapter-rail__buttons {
    display: block;
  }

  .audio-guide {
    position: fixed;
    top: 72px;
    right: 16px;
    left: 16px;
    display: grid;
    grid-template-columns: auto minmax(0, 1fr);
    gap: 6px 10px;
    min-height: 44px;
    padding: 6px;
    border: 1px solid rgba(205, 231, 239, 0.14);
    border-radius: var(--radius);
    background: rgba(5, 11, 17, 0.74);
    backdrop-filter: blur(14px);
  }

  .audio-guide__label {
    display: inline-flex;
    align-items: center;
    font-size: 10px;
    letter-spacing: 0;
  }

  .audio-guide__controls {
    display: grid;
    grid-template-columns: 64px minmax(0, 1fr);
    gap: 6px;
  }

  .audio-guide__button,
  .audio-guide__select {
    min-height: 31px;
    font-size: 12px;
  }

  .chapter-button {
    display: none;
    width: 100%;
    min-height: 58px;
    padding: 0 18px;
    border: 1px solid var(--line);
    border-radius: var(--radius);
    background: rgba(5, 11, 17, 0.82);
    color: #dce9eb;
    text-align: center;
    font-size: 14px;
    font-weight: 700;
    backdrop-filter: blur(14px);
    box-shadow: 0 14px 34px rgba(0, 0, 0, 0.24);
  }

  .chapter-button::after {
    display: none;
  }

  .chapter-button:hover:not(:disabled),
  .chapter-button:focus-visible {
    border-color: var(--line-strong);
    background: rgba(91, 213, 255, 0.12);
  }

  .chapter-button[aria-pressed="true"] {
    display: flex;
    align-items: center;
    justify-content: center;
    border-color: rgba(205, 231, 239, 0.2);
    background: rgba(7, 18, 24, 0.9);
    color: var(--text);
  }

  .node-panel {
    top: auto;
    right: 16px;
    bottom: calc(88px + env(safe-area-inset-bottom));
    left: 16px;
    width: auto;
    max-height: min(52dvh, 430px);
    padding: 14px;
    z-index: 7;
  }

  .app-shell[data-mode="explore"][data-mobile-panel="closed"] .node-panel {
    display: none;
  }

  .node-panel__close {
    display: inline-flex;
    align-items: center;
    justify-content: center;
    width: 32px;
    height: 32px;
    padding: 0;
    border-color: rgba(205, 231, 239, 0.16);
    background: rgba(255, 255, 255, 0.04);
    color: var(--muted);
    font-size: 22px;
    line-height: 1;
  }

  .node-panel h2 {
    font-size: 23px;
  }

  .mobile-scroll-steps {
    display: block;
    position: relative;
    z-index: 1;
    pointer-events: none;
  }

  .mobile-scroll-step {
    min-height: 100dvh;
    scroll-snap-align: start;
  }

  .app-shell[data-mode="explore"] #space-canvas {
    touch-action: pan-y;
  }

}

@media (max-width: 640px) {
  .top-bar {
    align-items: center;
  }

  .brand {
    max-width: 145px;
    white-space: normal;
  }

  :lang(en) .brand {
    max-width: min(190px, calc(100vw - 148px));
    font-size: 16px;
    line-height: 1.12;
  }

  :lang(zh-Hant) .brand {
    max-width: min(190px, calc(100vw - 148px));
    font-size: 17px;
    line-height: 1.12;
  }

  .language-menu__trigger {
    min-width: 52px;
    padding: 0 8px;
  }

  .language-menu {
    min-width: 104px;
  }

  .about-dialog__surface {
    padding: 24px 20px;
  }

  .about-dialog__header {
    gap: 12px;
    margin-right: 40px;
  }

  .about-dialog__mark {
    width: 60px;
    height: 60px;
    border-radius: 14px;
  }

  .about-dialog__title {
    font-size: 26px;
  }

  .hero-copy {
    padding-top: 88px;
  }

  .hero-copy__kicker {
    font-size: 12px;
  }

  :lang(en) .hero-copy__kicker {
    font-size: 12px;
    letter-spacing: 0;
  }

  .hero-copy__prompt {
    display: none;
  }

  .hero-copy__actions {
    margin-top: 0;
  }

  .hero-action {
    min-height: 39px;
    padding: 0 12px;
    font-size: 13px;
  }

  .node-panel {
    bottom: calc(84px + env(safe-area-inset-bottom));
    max-height: 48dvh;
  }

  .node-panel__header {
    align-items: flex-start;
    flex-direction: row;
    gap: 10px;
  }

  .detail-tab {
    font-size: 12px;
  }

  .node-panel__metric-grid {
    grid-template-columns: 1fr;
  }

  .fallback-view {
    padding: 96px 16px 32px;
  }

  .seo-noscript {
    padding: 20px 16px 44px;
  }

  .fallback-view__nodes {
    grid-template-columns: 1fr;
  }
}

@media (max-height: 720px) and (min-width: 921px) {
  .hero-copy {
    padding-top: 88px;
  }

  .hero-copy h1 {
    font-size: clamp(36px, 5.8vw, 72px);
  }

  .hero-copy__subtitle,
  .hero-copy__prompt {
    max-width: 48ch;
  }

  .chapter-rail {
    top: 82px;
    right: auto;
    bottom: auto;
    left: 20px;
    grid-template-columns: 1fr;
    width: 188px;
    max-height: calc(100dvh - 142px);
    overflow-y: auto;
    padding-right: 3px;
    scrollbar-width: none;
  }

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

  .chapter-button {
    min-height: 38px;
    padding: 6px 9px;
  }

  .app-shell[data-mode="explore"] .hero-copy {
    display: none;
  }

  .app-shell[data-mode="intro"] .chapter-rail,
  .app-shell[data-mode="intro"] .node-panel {
    display: none;
  }
}

@media (prefers-reduced-motion: reduce) {
  *,
  *::before,
  *::after {
    scroll-behavior: auto !important;
    transition-duration: 0.01ms !important;
    animation-duration: 0.01ms !important;
    animation-iteration-count: 1 !important;
  }
}