:root {
  --ink: #121417;
  --muted: #5b6571;
  --panel: #ffffff;
  --surface: #f4f7f9;
  --line: #d6dee6;
  --space: #090d15;
  --teal: #1c7f83;
  --red: #c64232;
  --gold: #c28b18;
  --violet: #6156a6;
  --green: #427a38;
  --focus: #0b63ce;
  --shadow: 0 18px 50px rgba(13, 22, 35, 0.12);
  --bottom-bar-height: 74px;
}

* {
  box-sizing: border-box;
}

[hidden] {
  display: none !important;
}

html {
  scroll-behavior: smooth;
}

body {
  margin: 0;
  color: var(--ink);
  background: var(--surface);
  font-family:
    Inter, ui-sans-serif, system-ui, -apple-system, BlinkMacSystemFont, "Segoe UI", sans-serif;
  line-height: 1.55;
}

a {
  color: var(--focus);
  text-underline-offset: 3px;
}

button,
input,
select {
  font: inherit;
}

button {
  cursor: pointer;
}

.hero {
  position: relative;
  min-height: 66vh;
  color: #fff;
  background:
    linear-gradient(90deg, rgba(4, 9, 17, 0.9) 0%, rgba(4, 9, 17, 0.7) 48%, rgba(4, 9, 17, 0.18) 100%),
    url("https://www.nasa.gov/wp-content/uploads/2019/07/edu_srch_celebrate_the_50th_anniversary_apollo11.jpg?w=1600");
  background-size: cover;
  background-position: center;
  display: flex;
  flex-direction: column;
}

.hero__overlay {
  position: absolute;
  inset: 0;
  pointer-events: none;
  background-image:
    linear-gradient(rgba(255, 255, 255, 0.05) 1px, transparent 1px),
    linear-gradient(90deg, rgba(255, 255, 255, 0.05) 1px, transparent 1px);
  background-size: 72px 72px;
  opacity: 0.45;
}

.topbar {
  position: relative;
  z-index: 1;
  width: min(1180px, calc(100% - 32px));
  margin: 0 auto;
  padding: 18px 0;
  display: flex;
  align-items: center;
  justify-content: space-between;
  gap: 18px;
}

.brand {
  color: #fff;
  font-weight: 800;
  text-decoration: none;
  letter-spacing: 0;
}

.nav-actions {
  display: flex;
  align-items: center;
  gap: 8px;
  flex-wrap: wrap;
  justify-content: flex-end;
}

.mode-actions {
  display: flex;
  align-items: center;
  gap: 10px;
  flex-wrap: wrap;
  justify-content: center;
}

.nav-button,
.chip,
.mission-choice,
.mode-toggle,
.language-toggle button {
  border: 1px solid rgba(255, 255, 255, 0.42);
  color: #fff;
  background: rgba(255, 255, 255, 0.1);
  border-radius: 8px;
  padding: 8px 12px;
  min-height: 38px;
}

.nav-button:hover,
.nav-button.is-active,
.mode-toggle:hover,
.mode-toggle[aria-pressed="true"],
.language-toggle button:hover,
.language-toggle button.is-active {
  background: #fff;
  color: var(--space);
}

.language-toggle {
  display: flex;
  gap: 6px;
  flex-wrap: wrap;
}

.ui-icon {
  width: 18px;
  height: 18px;
  flex: 0 0 auto;
  fill: none;
  stroke: currentColor;
  stroke-width: 2.2;
  stroke-linecap: round;
  stroke-linejoin: round;
}

.card-icon {
  width: 34px;
  height: 34px;
  color: var(--space);
}

.nav-button {
  display: inline-flex;
  align-items: center;
  gap: 7px;
}

.nav-button span {
  display: grid;
  gap: 1px;
}

.nav-button small {
  font-size: 0.74rem;
  font-weight: 650;
  color: currentColor;
  opacity: 0.75;
}

.mobile-menu-toggle,
.filter-toggle,
.section-rail,
.mobile-nav-sheet,
.bottom-guide-bar {
  display: none;
}

.hero__content {
  position: relative;
  z-index: 1;
  width: min(1180px, calc(100% - 32px));
  margin: auto auto 64px;
  max-width: 760px;
  align-self: center;
}

.kicker {
  margin: 0 0 10px;
  color: var(--gold);
  font-weight: 800;
  text-transform: uppercase;
  font-size: 0.78rem;
  letter-spacing: 0.08em;
}

.hero h1 {
  margin: 0;
  font-size: 3.55rem;
  line-height: 1.02;
  letter-spacing: 0;
  max-width: 760px;
}

.hero p:not(.kicker) {
  margin: 20px 0 0;
  max-width: 680px;
  font-size: 1.12rem;
  color: rgba(255, 255, 255, 0.86);
}

.hero__content--kid {
  display: grid;
  grid-template-columns: minmax(0, 1fr) 210px;
  gap: 28px;
  align-items: end;
  max-width: 960px;
}

.kid-guide-art {
  width: min(210px, 36vw);
  border: 3px solid rgba(255, 255, 255, 0.72);
  border-radius: 8px;
  background: #fff;
  box-shadow: var(--shadow);
}

.kid-mode .hero {
  color: var(--ink);
  background:
    linear-gradient(90deg, rgba(246, 250, 255, 0.96) 0%, rgba(237, 247, 244, 0.92) 54%, rgba(255, 244, 207, 0.86) 100%),
    url("https://www.nasa.gov/wp-content/uploads/2019/07/edu_srch_celebrate_the_50th_anniversary_apollo11.jpg?w=1600");
  background-size: cover;
  background-position: center;
}

.kid-mode .hero__overlay {
  opacity: 0.18;
}

.kid-mode .brand,
.kid-mode .hero p:not(.kicker) {
  color: var(--ink);
}

.kid-mode .nav-button,
.kid-mode .mode-toggle,
.kid-mode .language-toggle button {
  border-color: rgba(18, 20, 23, 0.25);
  color: var(--ink);
  background: rgba(255, 255, 255, 0.78);
}

.kid-mode .nav-button:hover,
.kid-mode .nav-button.is-active,
.kid-mode .mode-toggle:hover,
.kid-mode .mode-toggle[aria-pressed="true"],
.kid-mode .language-toggle button:hover,
.kid-mode .language-toggle button.is-active {
  color: #fff;
  background: var(--space);
  border-color: var(--space);
}

.control-band {
  background: #fff;
  border-bottom: 1px solid var(--line);
}

.control-shell {
  width: min(1180px, calc(100% - 32px));
  margin: 0 auto;
  padding: 18px 0 16px;
}

.control-title {
  display: flex;
  align-items: end;
  justify-content: space-between;
  gap: 18px;
  margin-bottom: 14px;
}

.mobile-filter-chips {
  display: none;
}

.control-title .kicker {
  color: var(--teal);
}

.control-title h2 {
  margin: 0;
  max-width: 660px;
  font-size: 1.28rem;
}

.control-title p:not(.kicker) {
  margin: 5px 0 0;
  max-width: 720px;
  color: var(--muted);
}

.control-grid {
  display: grid;
  grid-template-columns: 1.5fr 1fr 1fr;
  gap: 14px;
}

.field {
  display: grid;
  gap: 7px;
}

.field span {
  font-size: 0.78rem;
  color: var(--muted);
  font-weight: 750;
  text-transform: uppercase;
}

.field small {
  color: var(--muted);
  font-size: 0.78rem;
}

.field input,
.field select {
  width: 100%;
  border: 1px solid var(--line);
  border-radius: 8px;
  background: #fff;
  min-height: 44px;
  padding: 0 12px;
  color: var(--ink);
}

.filter-status {
  margin-top: 14px;
  display: grid;
  grid-template-columns: 1fr auto;
  gap: 10px 14px;
  align-items: center;
}

.filter-chips {
  display: flex;
  flex-wrap: wrap;
  gap: 8px;
}

.filter-chip {
  display: inline-flex;
  align-items: center;
  min-height: 28px;
  border: 1px solid rgba(40, 114, 115, 0.22);
  border-radius: 999px;
  padding: 0 10px;
  color: var(--ink);
  background: rgba(70, 163, 154, 0.12);
  font-size: 0.84rem;
  font-weight: 750;
}

.filter-chip--muted {
  border-color: var(--line);
  color: var(--muted);
  background: #f8faf9;
}

.filter-status p {
  grid-column: 1;
  margin: 0;
  color: var(--muted);
  font-size: 0.9rem;
}

.clear-filters {
  grid-column: 2;
  grid-row: 1 / span 2;
  min-height: 38px;
  border: 1px solid var(--line);
  border-radius: 8px;
  padding: 0 14px;
  color: var(--ink);
  background: #fff;
  font-weight: 800;
  cursor: pointer;
}

.clear-filters:disabled {
  cursor: default;
  color: #9aa5a2;
  background: #f5f7f6;
}

.view,
.source-band {
  display: none;
  width: min(1180px, calc(100% - 32px));
  margin: 0 auto;
  padding: 54px 0;
}

.view.is-visible,
.source-band {
  display: block;
}

.section-head {
  max-width: 760px;
  margin-bottom: 26px;
}

.section-head--compact {
  margin-bottom: 18px;
}

.section-head h2 {
  margin: 0;
  font-size: 2.25rem;
  line-height: 1.12;
  letter-spacing: 0;
}

.section-head p:not(.kicker) {
  margin: 14px 0 0;
  color: var(--muted);
  font-size: 1.02rem;
}

.layer-stack {
  display: grid;
  grid-template-columns: repeat(6, minmax(0, 1fr));
  gap: 10px;
  align-items: stretch;
}

.layer-card,
.timeline-card,
.country-card,
.rocket-card,
.zone-card,
.basics-result,
.ladder-step,
.chain-card,
.scenario-result,
.myth-card,
.watch-card,
.market-card,
.signal-card,
.future-card,
.constraint-card,
.learning-card,
.glossary-card,
.plain-panel,
.mission-result {
  background: var(--panel);
  border: 1px solid var(--line);
  border-radius: 8px;
  box-shadow: 0 1px 0 rgba(18, 20, 23, 0.02);
}

.layer-card {
  padding: 18px;
  min-height: 190px;
  display: grid;
  gap: 10px;
  align-content: start;
  border-top: 4px solid var(--teal);
}

.layer-card:nth-child(2) {
  border-top-color: var(--red);
}

.layer-card:nth-child(3) {
  border-top-color: var(--gold);
}

.layer-card:nth-child(4) {
  border-top-color: var(--violet);
}

.layer-card:nth-child(5) {
  border-top-color: var(--green);
}

.layer-card:nth-child(6) {
  border-top-color: #44546a;
}

.layer-card h3,
.plain-panel h3,
.country-card h3,
.rocket-card h3,
.zone-card h3,
.basics-result h3,
.ladder-step h3,
.chain-card h3,
.scenario-result h3,
.myth-card h3,
.watch-card h3,
.market-card h3,
.future-card h3,
.constraint-card h3,
.learning-card h3,
.mission-result h3,
.glossary-card h3 {
  margin: 0;
  font-size: 1.05rem;
  line-height: 1.2;
}

.layer-card p,
.plain-panel p,
.country-card p,
.rocket-card p,
.zone-card p,
.basics-result p,
.ladder-step p,
.chain-card p,
.scenario-result p,
.myth-card p,
.watch-card p,
.market-card p,
.signal-card p,
.future-card p,
.constraint-card p,
.learning-card p,
.mission-result p,
.glossary-card p {
  margin: 0;
  color: var(--muted);
}

.layer-index {
  width: 34px;
  height: 34px;
  display: grid;
  place-items: center;
  border-radius: 50%;
  color: #fff;
  background: var(--space);
  font-weight: 800;
}

.layer-card__head {
  display: flex;
  align-items: center;
  justify-content: space-between;
  gap: 12px;
}

.visual-primer {
  display: grid;
  grid-template-columns: repeat(3, minmax(0, 1fr));
  gap: 14px;
  margin: 0 0 30px;
}

.visual-card,
.instruction-visual {
  overflow: hidden;
  border: 1px solid var(--line);
  border-radius: 8px;
  background: #fff;
}

.visual-card {
  display: grid;
  align-content: start;
}

.visual-card > div {
  display: grid;
  gap: 6px;
  padding: 14px;
}

.visual-card h3 {
  margin: 0;
  font-size: 1rem;
  line-height: 1.2;
}

.visual-card p {
  margin: 0;
  color: var(--muted);
  font-size: 0.9rem;
}

.instruction-visual {
  display: grid;
  gap: 0;
  margin: 0;
}

.instruction-visual__image {
  display: block;
  width: 100%;
  aspect-ratio: 13 / 7;
  object-fit: cover;
  background: #f8fafc;
}

.instruction-visual figcaption {
  padding: 9px 12px;
  color: var(--muted);
  font-size: 0.84rem;
  font-weight: 750;
}

.explain-grid {
  margin-top: 16px;
  display: grid;
  grid-template-columns: 1fr 1fr;
  gap: 16px;
}

.sub-module {
  margin-top: 36px;
}

.sub-module:first-of-type {
  margin-top: 0;
}

.zone-grid {
  display: grid;
  grid-template-columns: repeat(4, minmax(0, 1fr));
  gap: 14px;
}

.zone-card,
.basics-result,
.ladder-step,
.chain-card,
.scenario-result,
.myth-card,
.watch-card {
  padding: 18px;
  display: grid;
  gap: 12px;
  align-content: start;
}

.zone-card {
  border-top: 4px solid var(--teal);
}

.zone-card__top {
  display: grid;
  gap: 6px;
}

.zone-card__top span {
  color: var(--muted);
  font-size: 0.84rem;
  font-weight: 750;
}

.basics-layout,
.scenario-layout {
  display: grid;
  grid-template-columns: 330px 1fr;
  gap: 18px;
  align-items: start;
}

.basics-picker,
.scenario-picker {
  display: grid;
  gap: 10px;
}

.basics-choice,
.scenario-choice {
  width: 100%;
  min-height: 74px;
  text-align: left;
  border: 1px solid var(--line);
  border-radius: 8px;
  padding: 13px;
  color: var(--ink);
  background: #fff;
}

.basics-choice strong,
.scenario-choice strong,
.mission-choice strong {
  display: block;
  line-height: 1.2;
}

.basics-choice span,
.scenario-choice span,
.mission-choice span {
  display: block;
  margin-top: 5px;
  color: var(--muted);
  font-size: 0.88rem;
}

.basics-choice.is-active,
.scenario-choice.is-active {
  color: #fff;
  background: var(--space);
  border-color: var(--space);
}

.basics-choice.is-active span,
.scenario-choice.is-active span,
.mission-choice.is-active span {
  color: rgba(255, 255, 255, 0.76);
}

.diagram-line {
  display: grid;
  grid-template-columns: repeat(4, minmax(0, 1fr));
  gap: 8px;
  align-items: center;
}

.diagram-line span {
  min-height: 48px;
  display: grid;
  place-items: center;
  border-radius: 8px;
  color: #fff;
  background: var(--space);
  font-size: 0.82rem;
  font-weight: 800;
}

.diagram-line span:nth-child(2) {
  background: var(--teal);
}

.diagram-line span:nth-child(3) {
  background: var(--violet);
}

.diagram-line span:nth-child(4) {
  background: var(--gold);
}

.capability-ladder {
  display: grid;
  grid-template-columns: repeat(5, minmax(0, 1fr));
  gap: 12px;
}

.ladder-step {
  position: relative;
  min-height: 260px;
  border-left: 4px solid var(--space);
}

.ladder-step__level {
  width: 38px;
  height: 38px;
  display: grid;
  place-items: center;
  border-radius: 50%;
  color: #fff;
  background: var(--space);
  font-weight: 850;
}

.value-chain {
  display: grid;
  grid-template-columns: repeat(4, minmax(0, 1fr));
  gap: 12px;
}

.chain-card {
  min-height: 250px;
  border-top: 4px solid var(--green);
}

.scenario-result ul {
  margin: 6px 0 0;
  padding-left: 18px;
  color: var(--muted);
}

.scenario-columns {
  display: grid;
  grid-template-columns: repeat(3, minmax(0, 1fr));
  gap: 14px;
}

.myth-grid {
  display: grid;
  grid-template-columns: repeat(3, minmax(0, 1fr));
  gap: 14px;
}

.myth-card {
  border-top: 4px solid var(--red);
}

.myth-card__pair {
  display: grid;
  gap: 5px;
}

.myth-card__pair strong {
  font-size: 0.82rem;
  color: var(--ink);
  text-transform: uppercase;
}

.watchlist-grid {
  display: grid;
  grid-template-columns: repeat(3, minmax(0, 1fr));
  gap: 14px;
}

.watch-card {
  border-left: 4px solid var(--gold);
}

.plain-panel {
  padding: 22px;
}

.timeline {
  position: relative;
  display: grid;
  gap: 12px;
}

.timeline::before {
  content: "";
  position: absolute;
  left: 74px;
  top: 10px;
  bottom: 10px;
  width: 2px;
  background: var(--line);
}

.timeline-card {
  position: relative;
  display: grid;
  grid-template-columns: 118px 1fr;
  gap: 18px;
  padding: 18px;
}

.timeline-year {
  position: relative;
  z-index: 1;
  display: grid;
  align-content: start;
  gap: 8px;
  color: var(--space);
  font-weight: 850;
}

.timeline-year span {
  width: fit-content;
  padding: 5px 9px;
  color: #fff;
  background: var(--space);
  border-radius: 8px;
}

.timeline-body {
  display: grid;
  gap: 9px;
}

.timeline-topline {
  display: flex;
  gap: 10px;
  align-items: flex-start;
  justify-content: space-between;
}

.timeline-title {
  margin: 0;
  font-size: 1.2rem;
}

.expand-button {
  border: 1px solid var(--line);
  background: #fff;
  color: var(--ink);
  border-radius: 8px;
  width: 38px;
  height: 38px;
  flex: 0 0 auto;
  font-weight: 900;
}

.timeline-card.is-open .expand-button {
  color: #fff;
  background: var(--space);
}

.timeline-detail {
  display: none;
  border-top: 1px solid var(--line);
  padding-top: 10px;
}

.timeline-card.is-open .timeline-detail {
  display: block;
}

.tag-row,
.source-links,
.strength-row {
  display: flex;
  flex-wrap: wrap;
  gap: 7px;
  align-items: center;
}

.tag {
  display: inline-flex;
  align-items: center;
  min-height: 26px;
  border-radius: 999px;
  padding: 3px 9px;
  font-size: 0.78rem;
  font-weight: 800;
  color: var(--space);
  background: #edf2f6;
}

.tag--country {
  background: #f1e2dc;
}

.tag--commercial {
  background: #e1f0ef;
}

.tag--science {
  background: #eee9f7;
}

.source-links a {
  font-size: 0.86rem;
  color: var(--focus);
}

.country-grid {
  display: grid;
  grid-template-columns: repeat(3, minmax(0, 1fr));
  gap: 16px;
}

.country-card,
.rocket-card {
  padding: 20px;
  display: grid;
  gap: 14px;
  align-content: start;
}

.country-card header,
.rocket-card header {
  display: flex;
  align-items: flex-start;
  justify-content: space-between;
  gap: 14px;
}

.rocket-grid {
  display: grid;
  grid-template-columns: repeat(3, minmax(0, 1fr));
  gap: 16px;
}

.mini-kicker {
  margin: 0 0 6px;
  color: var(--muted);
  font-size: 0.78rem;
  font-weight: 800;
  text-transform: uppercase;
}

.spec-row {
  display: grid;
  grid-template-columns: repeat(3, minmax(0, 1fr));
  gap: 8px;
}

.spec-row span {
  min-height: 34px;
  display: grid;
  place-items: center;
  text-align: center;
  border: 1px solid var(--line);
  border-radius: 8px;
  padding: 6px 8px;
  color: var(--space);
  background: #f7fafc;
  font-size: 0.82rem;
  font-weight: 750;
}

.rank-pill {
  min-width: 72px;
  text-align: center;
  border-radius: 999px;
  padding: 5px 9px;
  color: #fff;
  background: var(--space);
  font-size: 0.78rem;
  font-weight: 850;
}

.country-section {
  display: grid;
  gap: 5px;
}

.country-section strong {
  font-size: 0.82rem;
  text-transform: uppercase;
  color: var(--ink);
}

.strength-row .tag {
  background: #f2f5f8;
}

.commercial-layout {
  display: grid;
  grid-template-columns: 0.9fr 1.1fr;
  gap: 18px;
  align-items: start;
}

.market-map {
  position: sticky;
  top: 16px;
  min-height: 520px;
  border-radius: 8px;
  overflow: hidden;
  color: #fff;
  background:
    radial-gradient(circle at 50% 45%, rgba(255, 255, 255, 0.18), transparent 0 96px),
    #101722;
  border: 1px solid #1c2736;
  box-shadow: var(--shadow);
}

.orbit {
  position: absolute;
  left: 50%;
  top: 48%;
  border: 1px solid rgba(255, 255, 255, 0.22);
  border-radius: 50%;
  transform: translate(-50%, -50%);
}

.orbit--low {
  width: 230px;
  height: 230px;
}

.orbit--moon {
  width: 340px;
  height: 340px;
}

.orbit--deep {
  width: 450px;
  height: 450px;
}

.planet {
  position: absolute;
  left: 50%;
  top: 48%;
  width: 88px;
  height: 88px;
  border-radius: 50%;
  transform: translate(-50%, -50%);
  background:
    linear-gradient(140deg, #2f8ca3 0%, #2f8ca3 42%, #427a38 43%, #427a38 60%, #dfeaf1 61%),
    #2f8ca3;
  box-shadow: inset -18px -20px 24px rgba(0, 0, 0, 0.32);
}

.market-node {
  position: absolute;
  width: 148px;
  min-height: 74px;
  border: 1px solid rgba(255, 255, 255, 0.28);
  border-radius: 8px;
  padding: 10px;
  background: rgba(255, 255, 255, 0.11);
  backdrop-filter: blur(10px);
}

.market-node strong {
  display: block;
  font-size: 0.88rem;
}

.market-node span {
  display: block;
  margin-top: 4px;
  color: rgba(255, 255, 255, 0.76);
  font-size: 0.78rem;
}

.commercial-list {
  display: grid;
  gap: 12px;
}

.market-card {
  padding: 20px;
  display: grid;
  gap: 10px;
}

.market-card button {
  justify-self: start;
  border: 1px solid var(--line);
  border-radius: 8px;
  background: #fff;
  color: var(--ink);
  min-height: 36px;
  padding: 6px 11px;
}

.market-card[data-active="true"] {
  border-color: var(--teal);
  box-shadow: inset 4px 0 0 var(--teal);
}

.signal-strip {
  display: grid;
  grid-template-columns: repeat(4, minmax(0, 1fr));
  gap: 12px;
  margin-bottom: 18px;
}

.signal-card {
  padding: 18px;
  border-top: 4px solid var(--red);
}

.signal-card strong {
  display: block;
  font-size: 2rem;
  line-height: 1;
  color: var(--space);
}

.signal-card span {
  display: block;
  margin-top: 8px;
  color: var(--ink);
  font-weight: 800;
}

.signal-card p {
  margin-top: 8px;
}

.future-grid {
  display: grid;
  grid-template-columns: repeat(2, minmax(0, 1fr));
  gap: 16px;
}

.future-card,
.constraint-card,
.learning-card {
  padding: 20px;
  display: grid;
  gap: 12px;
}

.future-card {
  border-left: 4px solid var(--violet);
}

.future-card__top {
  display: flex;
  align-items: center;
  gap: 8px;
  flex-wrap: wrap;
}

.sub-section-head {
  margin-top: 36px;
}

.constraint-grid {
  display: grid;
  grid-template-columns: repeat(3, minmax(0, 1fr));
  gap: 14px;
}

.constraint-card {
  border-top: 4px solid var(--gold);
}

.learning-path {
  display: grid;
  grid-template-columns: repeat(5, minmax(0, 1fr));
  gap: 12px;
}

.learning-card {
  position: relative;
  min-height: 190px;
  align-content: start;
}

.learning-card .step-number {
  background: var(--space);
}

.mission-grid {
  display: grid;
  grid-template-columns: 320px 1fr;
  gap: 18px;
  align-items: start;
}

.mission-picker {
  display: grid;
  gap: 10px;
}

.mission-choice {
  width: 100%;
  text-align: left;
  color: var(--ink);
  background: #fff;
  border-color: var(--line);
  padding: 14px;
}

.mission-choice.is-active {
  color: #fff;
  background: var(--space);
  border-color: var(--space);
}

.mission-result {
  padding: 24px;
  display: grid;
  gap: 16px;
}

.step-list {
  display: grid;
  gap: 10px;
  margin: 0;
  padding: 0;
  list-style: none;
}

.step-list li {
  display: grid;
  grid-template-columns: 42px 1fr;
  gap: 12px;
  align-items: start;
}

.step-number {
  width: 34px;
  height: 34px;
  border-radius: 50%;
  display: grid;
  place-items: center;
  color: #fff;
  background: var(--teal);
  font-weight: 850;
}

.glossary-grid {
  display: grid;
  grid-template-columns: repeat(3, minmax(0, 1fr));
  gap: 14px;
}

.glossary-card {
  padding: 18px;
}

.source-band {
  border-top: 1px solid var(--line);
}

.source-list {
  display: grid;
  grid-template-columns: repeat(2, minmax(0, 1fr));
  gap: 8px 18px;
}

.source-list a {
  display: block;
  min-height: 32px;
}

.kid-mode-panel {
  width: min(980px, calc(100% - 32px));
  margin: 0 auto;
  padding: 44px 0 58px;
}

.kid-panel-head {
  display: grid;
  grid-template-columns: 124px 1fr;
  gap: 20px;
  align-items: center;
  margin-bottom: 24px;
}

.kid-panel-guide {
  width: 124px;
  border: 1px solid var(--line);
  border-radius: 8px;
  background: #fff;
}

.kid-panel-head h2 {
  margin: 0;
  font-size: 2rem;
  line-height: 1.12;
}

.kid-intro-text,
.kid-text,
.kid-small-text,
.kid-result-sentence {
  margin: 8px 0 0;
  color: var(--muted);
}

.kid-journey {
  display: grid;
  gap: 18px;
}

.kid-card {
  display: grid;
  gap: 18px;
  padding: 24px;
  border: 1px solid var(--line);
  border-radius: 8px;
  background: #fff;
  box-shadow: 0 1px 0 rgba(18, 20, 23, 0.03);
}

.kid-card__top {
  display: flex;
  align-items: center;
  justify-content: space-between;
  gap: 12px;
  flex-wrap: wrap;
}

.kid-step,
.kid-guide-pill {
  display: inline-flex;
  align-items: center;
  min-height: 34px;
  border-radius: 999px;
  padding: 4px 12px;
  font-size: 0.88rem;
  font-weight: 850;
}

.kid-step {
  color: var(--space);
  background: #fff1cc;
}

.kid-guide-pill {
  color: #fff;
  background: var(--teal);
}

.kid-card__title {
  display: grid;
  gap: 6px;
}

.kid-card__title h3,
.kid-card__title h4 {
  margin: 0;
  line-height: 1.14;
  letter-spacing: 0;
}

.kid-card__title h3 {
  font-size: 2rem;
}

.kid-card__title h4 {
  font-size: 1.35rem;
}

.kid-copy {
  max-width: 760px;
}

.kid-copy .kid-text {
  font-size: 1.18rem;
  color: var(--ink);
}

.kid-mini-panels {
  display: grid;
  grid-template-columns: 1fr 1fr;
  gap: 16px;
}

.kid-mini-panel {
  display: grid;
  gap: 4px;
  padding-left: 14px;
  border-left: 4px solid var(--gold);
}

.kid-mini-panel:nth-child(2) {
  border-left-color: var(--teal);
}

.kid-mini-panel strong,
.kid-choice-group strong,
.kid-result strong {
  color: var(--ink);
  font-size: 0.84rem;
  text-transform: uppercase;
}

.kid-word-chip-row,
.kid-choice-row,
.kid-word-list {
  display: flex;
  gap: 10px;
  flex-wrap: wrap;
}

.kid-word-chip-row button,
.kid-choice-row button,
.kid-word-list button {
  display: inline-flex;
  align-items: center;
  justify-content: center;
  gap: 8px;
  min-height: 44px;
  border: 1px solid var(--line);
  border-radius: 8px;
  padding: 8px 12px;
  color: var(--ink);
  background: #f8fafc;
  font-weight: 800;
}

.kid-choice-row button {
  min-height: 64px;
  min-width: 138px;
  flex-direction: column;
}

.kid-choice-row .ui-icon,
.kid-word-list .ui-icon,
.kid-word-chip-row .ui-icon {
  width: 22px;
  height: 22px;
}

.kid-word-chip-row button:hover,
.kid-choice-row button:hover,
.kid-word-list button:hover,
.kid-choice-row button.is-active,
.kid-word-list button.is-active {
  color: #fff;
  border-color: var(--space);
  background: var(--space);
}

.kid-source-details {
  border-top: 1px solid var(--line);
  padding-top: 12px;
}

.kid-source-details summary,
.kid-word-details summary {
  width: fit-content;
  min-height: 38px;
  cursor: pointer;
  color: var(--space);
  font-weight: 850;
}

.kid-source-details .source-links {
  margin-top: 10px;
}

.kid-mission-builder {
  display: grid;
  gap: 18px;
}

.kid-choice-group {
  display: grid;
  gap: 8px;
}

.kid-result {
  display: grid;
  gap: 6px;
  padding: 16px 0 0;
  border-top: 1px solid var(--line);
}

.kid-result-sentence {
  color: var(--ink);
  font-size: 1.15rem;
  font-weight: 760;
}

.kid-word-details {
  display: grid;
  gap: 14px;
}

.kid-word-layout {
  display: grid;
  grid-template-columns: 260px 1fr;
  gap: 18px;
  margin-top: 14px;
  align-items: start;
}

.kid-word-list {
  display: grid;
}

.kid-word-card {
  display: grid;
  gap: 14px;
  padding-left: 18px;
  border-left: 4px solid var(--violet);
}

.kid-progress {
  display: flex;
  align-items: center;
  justify-content: space-between;
  gap: 14px;
  margin: 0 0 16px;
  color: var(--muted);
  font-weight: 800;
}

.kid-progress__dots {
  display: flex;
  gap: 8px;
  flex-wrap: wrap;
}

.kid-progress__dots button {
  width: 18px;
  height: 18px;
  border: 2px solid var(--line);
  border-radius: 50%;
  padding: 0;
  background: #fff;
}

.kid-progress__dots button.is-active {
  border-color: var(--space);
  background: var(--gold);
}

.kid-step-controls {
  display: grid;
  grid-template-columns: 1fr 1fr;
  gap: 12px;
  margin-top: 18px;
}

.kid-step-controls button {
  min-height: 50px;
  border: 1px solid var(--line);
  border-radius: 8px;
  padding: 10px 14px;
  color: var(--ink);
  background: #fff;
  font-weight: 850;
}

.kid-step-controls button:last-child {
  color: #fff;
  background: var(--space);
  border-color: var(--space);
}

.kid-step-controls button:disabled {
  cursor: default;
  color: #9aa5a2;
  background: #f5f7f6;
  border-color: var(--line);
}

.empty-state {
  border: 1px dashed var(--line);
  border-radius: 8px;
  padding: 22px;
  color: var(--muted);
  background: #fff;
}

@media (max-width: 980px) {
  .topbar,
  .control-grid,
  .basics-layout,
  .scenario-layout,
  .commercial-layout,
  .mission-grid {
    grid-template-columns: 1fr;
  }

  .topbar {
    display: grid;
    justify-items: start;
  }

  .control-title {
    display: grid;
    align-items: start;
  }

  .nav-actions {
    justify-content: flex-start;
  }

  .mode-actions {
    justify-content: flex-start;
  }

  .layer-stack,
  .country-grid,
  .rocket-grid,
  .zone-grid,
  .capability-ladder,
  .value-chain,
  .scenario-columns,
  .myth-grid,
  .watchlist-grid,
  .signal-strip,
  .future-grid,
  .constraint-grid,
  .learning-path,
  .glossary-grid,
  .source-list {
    grid-template-columns: repeat(2, minmax(0, 1fr));
  }

  .market-map {
    position: relative;
    top: 0;
  }

  .hero__content--kid,
  .kid-word-layout {
    grid-template-columns: 1fr;
  }

  .kid-guide-art {
    width: 180px;
  }
}

@media (max-width: 680px) {
  .hero {
    min-height: 72vh;
  }

  .hero h1 {
    font-size: 2.35rem;
  }

  .hero__content {
    margin-bottom: 38px;
  }

  .section-head h2 {
    font-size: 1.75rem;
  }

  .control-grid,
  .layer-stack,
  .explain-grid,
  .country-grid,
  .rocket-grid,
  .zone-grid,
  .capability-ladder,
  .value-chain,
  .diagram-line,
  .scenario-columns,
  .myth-grid,
  .watchlist-grid,
  .signal-strip,
  .future-grid,
  .constraint-grid,
  .learning-path,
  .glossary-grid,
  .source-list {
    grid-template-columns: 1fr;
  }

  .kid-panel-head,
  .kid-mini-panels {
    grid-template-columns: 1fr;
  }

  .kid-panel-guide {
    width: 106px;
  }

  .kid-card {
    padding: 18px;
  }

  .kid-card__title h3 {
    font-size: 1.55rem;
  }

  .kid-copy .kid-text,
  .kid-result-sentence {
    font-size: 1.05rem;
  }

  .filter-status {
    grid-template-columns: 1fr;
  }

  .clear-filters,
  .filter-status p {
    grid-column: auto;
    grid-row: auto;
  }

  .timeline::before {
    display: none;
  }

  .timeline-card {
    grid-template-columns: 1fr;
  }

  .market-map {
    min-height: 440px;
  }

  .market-node {
    width: 132px;
  }
}

@media (min-width: 1024px) {
  .hero {
    min-height: 52vh;
  }

  .hero h1 {
    font-size: 3.15rem;
  }

  .adult-nav {
    display: none;
  }

  .section-rail {
    position: fixed;
    z-index: 4;
    left: max(24px, calc((100vw - 1180px) / 2));
    top: 118px;
    width: 190px;
    max-height: calc(100vh - 140px);
    overflow: auto;
    display: grid;
    gap: 8px;
    padding: 12px;
    border: 1px solid rgba(214, 222, 230, 0.9);
    border-radius: 8px;
    background: rgba(255, 255, 255, 0.92);
    box-shadow: 0 16px 40px rgba(13, 22, 35, 0.1);
    backdrop-filter: blur(12px);
  }

  .rail-kicker {
    margin: 0 0 4px;
    color: var(--teal);
    font-size: 0.76rem;
    font-weight: 850;
    text-transform: uppercase;
  }

  .nav-button--rail {
    width: 100%;
    min-height: 54px;
    justify-content: flex-start;
    text-align: left;
    border-color: transparent;
    color: var(--ink);
    background: transparent;
  }

  .nav-button--rail:hover,
  .nav-button--rail.is-active {
    color: var(--space);
    background: #edf4f4;
    border-color: rgba(28, 127, 131, 0.24);
  }

  .view,
  .source-band {
    width: min(980px, calc(100% - 340px));
    margin-left: auto;
    margin-right: max(32px, calc((100vw - 1180px) / 2));
    padding: 46px 0;
  }

  .control-shell {
    width: min(980px, calc(100% - 340px));
    margin-left: auto;
    margin-right: max(32px, calc((100vw - 1180px) / 2));
  }

  .layer-stack {
    grid-template-columns: repeat(3, minmax(0, 1fr));
  }

  .kid-mode .section-rail {
    display: none;
  }
}

@media (min-width: 680px) and (max-width: 1023px) {
  .hero {
    min-height: 52vh;
  }

  .topbar {
    align-items: start;
  }

  .adult-nav,
  .kid-nav {
    width: 100%;
    display: flex;
    overflow-x: auto;
    flex-wrap: nowrap;
    padding-bottom: 4px;
  }

  .adult-nav .nav-button,
  .kid-nav .nav-button {
    flex: 0 0 auto;
  }

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

@media (max-width: 679px) {
  body {
    padding-bottom: var(--bottom-bar-height);
  }

  .hero {
    min-height: auto;
  }

  .topbar {
    width: min(100% - 24px, 1180px);
    padding: 12px 0;
    display: grid;
    grid-template-columns: 1fr auto;
    gap: 10px;
    align-items: center;
  }

  .brand {
    font-size: 0.96rem;
  }

  .mode-actions {
    justify-content: end;
    gap: 6px;
  }

  .mobile-menu-toggle {
    display: inline-flex;
  }

  .adult-nav {
    display: none;
  }

  .kid-nav {
    display: none !important;
  }

  .hero__content {
    width: min(100% - 28px, 1180px);
    margin: 26px auto 28px;
  }

  .hero h1 {
    max-width: 100%;
    font-size: 2.05rem;
    line-height: 1.08;
  }

  .hero p:not(.kicker) {
    margin-top: 14px;
    font-size: 1rem;
  }

  .hero__content--kid {
    gap: 18px;
  }

  .kid-guide-art {
    width: 140px;
  }

  .mobile-nav-sheet {
    position: fixed;
    z-index: 20;
    left: 12px;
    right: 12px;
    bottom: calc(var(--bottom-bar-height) + 10px);
    max-height: min(72vh, 560px);
    overflow: auto;
    display: grid;
    gap: 12px;
    padding: 14px;
    border: 1px solid var(--line);
    border-radius: 8px;
    background: #fff;
    box-shadow: var(--shadow);
  }

  .mobile-nav-sheet__head {
    display: flex;
    align-items: center;
    justify-content: space-between;
    gap: 12px;
  }

  .mobile-nav-sheet__head button {
    min-height: 40px;
    border: 1px solid var(--line);
    border-radius: 8px;
    background: #fff;
    font-weight: 800;
  }

  .mobile-nav-list {
    display: grid;
    gap: 8px;
  }

  .mobile-nav-list .nav-button {
    width: 100%;
    min-height: 52px;
    justify-content: flex-start;
    color: var(--ink);
    background: #f8fafc;
    border-color: var(--line);
  }

  .mobile-nav-list .nav-button.is-active {
    color: #fff;
    background: var(--space);
    border-color: var(--space);
  }

  .bottom-guide-bar {
    position: fixed;
    z-index: 18;
    left: 0;
    right: 0;
    bottom: 0;
    min-height: var(--bottom-bar-height);
    display: grid;
    grid-template-columns: 1fr auto 1fr;
    gap: 8px;
    padding: 10px 12px calc(10px + env(safe-area-inset-bottom));
    background: rgba(255, 255, 255, 0.96);
    border-top: 1px solid var(--line);
    box-shadow: 0 -12px 34px rgba(13, 22, 35, 0.1);
    backdrop-filter: blur(12px);
  }

  .bottom-guide-bar button {
    min-height: 48px;
    border: 1px solid var(--line);
    border-radius: 8px;
    color: var(--ink);
    background: #fff;
    font-weight: 850;
    display: inline-flex;
    align-items: center;
    justify-content: center;
    gap: 6px;
  }

  .bottom-guide-bar button:last-child {
    color: #fff;
    background: var(--space);
    border-color: var(--space);
  }

  .bottom-guide-bar button:disabled {
    cursor: default;
    color: #98a2ad;
    background: #f5f7f6;
    border-color: var(--line);
  }

  .control-shell,
  .view,
  .source-band,
  .kid-mode-panel {
    width: min(100% - 28px, 1180px);
  }

  .control-shell {
    padding: 14px 0;
  }

  .control-title {
    grid-template-columns: 1fr auto;
    display: grid;
    align-items: center;
    gap: 10px;
    margin-bottom: 0;
  }

  .control-title .kicker,
  .control-title p:not(.kicker) {
    display: none;
  }

  .control-title h2 {
    font-size: 1rem;
  }

  .filter-toggle {
    min-height: 44px;
    display: inline-flex;
    align-items: center;
    justify-content: center;
    border: 1px solid var(--line);
    border-radius: 8px;
    padding: 0 12px;
    color: var(--ink);
    background: #fff;
    font-weight: 850;
  }

  .mobile-filter-chips {
    grid-column: 1 / -1;
    display: flex;
    flex-wrap: wrap;
    gap: 8px;
  }

  .filter-controls-panel {
    display: none;
    margin-top: 14px;
  }

  .control-band.is-open .filter-controls-panel {
    display: block;
  }

  .control-band.is-open .filter-toggle {
    color: #fff;
    background: var(--space);
    border-color: var(--space);
  }

  .view,
  .source-band {
    padding: 34px 0;
  }

  .section-head {
    margin-bottom: 18px;
  }

  .section-head h2 {
    font-size: 1.55rem;
  }

  .section-head p:not(.kicker) {
    font-size: 0.96rem;
  }

  .visual-primer {
    grid-template-columns: 1fr;
    margin-bottom: 22px;
  }

  .layer-card,
  .country-card,
  .rocket-card,
  .zone-card,
  .basics-result,
  .ladder-step,
  .chain-card,
  .scenario-result,
  .myth-card,
  .watch-card,
  .market-card,
  .signal-card,
  .future-card,
  .constraint-card,
  .learning-card,
  .mission-result,
  .glossary-card,
  .plain-panel,
  .kid-card {
    padding: 16px;
  }

  .basics-choice,
  .scenario-choice,
  .mission-choice {
    min-height: 64px;
  }

  .kid-mode-panel {
    padding-top: 30px;
  }

  .kid-progress {
    align-items: start;
  }

  .kid-step-controls {
    grid-template-columns: 1fr;
  }

  .kid-choice-row {
    display: grid;
    grid-template-columns: 1fr;
  }

  .kid-choice-row button,
  .kid-word-list button,
  .kid-word-chip-row button {
    width: 100%;
  }
}