:root {
  color-scheme: dark;
  --bg: #101a18;
  --panel: #16231f;
  --line: #34483b;
  --text: #e3e9dc;
  --muted: #a5b7a8;
  --accent: #d2ed9a;
  --warm: #eac596;
  font-family:
    Inter, "Helvetica Neue", Arial, "Hiragino Kaku Gothic ProN", Meiryo,
    sans-serif;
  color: var(--text);
  background: var(--bg);
  font-synthesis: none;
}
* {
  box-sizing: border-box;
}
[hidden] {
  display: none !important;
}
body {
  max-width: 1440px;
  margin: 0 auto;
  padding: 0 44px;
  font-size: 15px;
  line-height: 1.6;
}
button,
input,
a {
  touch-action: manipulation;
}
button {
  font: inherit;
  color: inherit;
  cursor: pointer;
  background: transparent;
  border: 1px solid var(--line);
  border-radius: 4px;
  padding: 10px 14px;
  min-height: 44px;
  line-height: 1.3;
}
button:hover:enabled {
  background: #293e2b;
  border-color: #809c68;
}
button[aria-pressed="true"] {
  color: var(--accent);
  background: #293c28;
  border-color: #91ab71;
}
button:disabled {
  cursor: default;
  opacity: 0.45;
}
a {
  color: var(--accent);
  text-underline-offset: 4px;
}
button:focus-visible,
a:focus-visible,
input:focus-visible,
summary:focus-visible {
  outline: 2px solid var(--accent);
  outline-offset: 4px;
}
h1,
h2,
h3,
h4,
p {
  margin: 0;
}
h1 {
  font-size: clamp(38px, 4.5vw, 64px);
  line-height: 1.08;
  font-weight: 500;
  letter-spacing: -0.04em;
}
h2 {
  font-size: 23px;
  line-height: 1.3;
  font-weight: 500;
  letter-spacing: -0.025em;
}
h3 {
  font-size: 18px;
  font-weight: 500;
  line-height: 1.4;
}
h4 {
  font-size: 14px;
}
p {
  margin-top: 12px;
}
ul,
ol {
  padding-left: 22px;
}
li + li {
  margin-top: 7px;
}
.eyebrow,
.mono,
.record-label,
.condition-index,
.stage-line,
.clue-label {
  font:
    11px/1.5 ui-monospace,
    SFMono-Regular,
    monospace;
  letter-spacing: 0.06em;
}
.eyebrow {
  margin: 0 0 10px;
  color: var(--accent);
}
.caption {
  font-size: 12px;
  color: var(--muted);
  line-height: 1.7;
}
.text-button {
  border-color: transparent;
  padding-left: 0;
  padding-right: 0;
  font-size: 13px;
  color: var(--muted);
}
.text-button:hover:enabled {
  background: transparent;
  border-color: transparent;
  color: var(--accent);
}
.primary {
  background: var(--accent);
  color: #192318;
  border-color: var(--accent);
  font-weight: 600;
  width: 100%;
  margin-top: 22px;
}
.primary:hover:enabled {
  background: #e0f7b1;
  color: #192318;
}
.skip-link {
  position: absolute;
  top: -100px;
  background: var(--bg);
  padding: 12px;
  z-index: 5;
}
.skip-link:focus {
  top: 8px;
}
.masthead {
  display: flex;
  justify-content: space-between;
  align-items: center;
  gap: 20px;
  padding: 24px 0;
  border-bottom: 1px solid var(--line);
}
.wordmark {
  color: var(--text);
  text-decoration: none;
  font-size: 14px;
  letter-spacing: 0.16em;
  white-space: nowrap;
}
.wordmark span {
  display: block;
  font-size: 8px;
  letter-spacing: 0.4em;
  color: var(--muted);
}
nav {
  display: flex;
  gap: 28px;
  align-items: center;
}
.language {
  display: flex;
  gap: 3px;
}
.language button {
  font-size: 12px;
  padding: 9px 12px;
}
.mission-head {
  display: grid;
  grid-template-columns: minmax(0, 1.35fr) minmax(310px, 1fr);
  gap: 70px;
  padding: 42px 0 32px;
  align-items: center;
}
.mission-intro h1 {
  max-width: 650px;
  text-wrap: balance;
  white-space: pre-line;
}
.rejection-heading {
  margin-top: 28px;
}
#rejection-checks {
  color: var(--warm);
}
.mission-goal {
  font-size: 18px;
  line-height: 1.4;
  margin-top: 22px;
}
.mission-context {
  color: var(--muted);
  font-size: 14px;
  max-width: 590px;
}
.mission-brief {
  border-left: 1px solid var(--line);
  padding: 6px 0 0 28px;
  align-self: center;
}
.mission-brief h2 {
  font-size: 23px;
}
.mission-brief .eyebrow {
  font-size: 10px;
  color: var(--accent);
}
.contribution-ledger {
  list-style: none;
  padding: 0;
  margin: 20px 0 0;
}
.contribution-ledger li {
  padding-left: 15px;
  border-left: 2px solid var(--line);
}
.contribution-ledger li:first-child {
  border-color: var(--accent);
}
.contribution-ledger li + li {
  margin-top: 14px;
}
.contribution-ledger strong {
  display: block;
  font-size: 12px;
  font-weight: 600;
}
.contribution-ledger span {
  display: block;
  margin-top: 3px;
  font-size: 12px;
  color: var(--muted);
  line-height: 1.55;
}
.source-links {
  display: flex;
  flex-wrap: wrap;
  gap: 8px 16px;
}
.source-links a {
  font-size: 11px;
}
.hero-actions {
  display: flex;
  gap: 22px;
  align-items: center;
  margin-top: 23px;
}
.hero-actions .primary {
  width: auto;
  margin: 0;
  padding: 13px 22px;
}
.record-strip {
  display: flex;
  gap: 25px;
  align-items: center;
  padding: 16px 0;
  border-top: 1px solid var(--line);
}
.record-strip .record-label {
  flex: 0 0 auto;
}
.record-strip p {
  margin: 0;
  font-size: 12px;
  color: var(--muted);
}
.record-label {
  color: var(--accent);
  font-size: 10px;
}
.mission-brief p {
  font-size: 12px;
  color: var(--muted);
  line-height: 1.7;
}
.duration {
  display: block;
  color: var(--text);
  font-size: 11px;
  margin-top: 14px;
}
.conditions {
  display: grid;
  grid-template-columns: repeat(3, 1fr);
  list-style: none;
  padding: 0;
  margin: 0;
  border-top: 1px solid var(--line);
  border-bottom: 1px solid var(--line);
}
.conditions li {
  min-width: 0;
  margin: 0;
  position: relative;
}
.conditions button {
  display: flex;
  gap: 13px;
  align-items: flex-start;
  padding: 20px 18px;
  width: 100%;
  min-height: 106px;
  height: 100%;
  text-align: left;
  border: 0;
  border-radius: 0;
}
.conditions button[aria-pressed="true"] {
  box-shadow: inset 0 -3px var(--accent);
}
.case-copy {
  flex: 1;
}
.case-arrow {
  color: var(--accent);
  font-size: 18px;
}
.conditions li + li {
  border-left: 1px solid var(--line);
}
.condition-index {
  color: var(--muted);
  padding-top: 4px;
}
.conditions strong {
  font-weight: 500;
  font-size: 15px;
}
.case-description {
  display: block;
  font-size: 11px;
  color: var(--muted);
  margin-top: 3px;
}
.condition-status {
  margin-left: auto;
  white-space: nowrap;
  font-size: 9px;
  text-transform: uppercase;
  letter-spacing: 0.03em;
  color: var(--muted);
  position: absolute;
  left: 46px;
  bottom: 12px;
}
.is-reviewed {
  background: #1c2b20;
}
.is-reviewed .condition-index,
.is-reviewed .condition-status {
  color: var(--accent);
}
.is-reviewed .condition-index::after {
  content: " ✓";
}
.stage-line {
  display: flex;
  justify-content: space-between;
  gap: 20px;
  color: var(--accent);
  padding-top: 23px;
}
.stage-line span:last-child {
  color: var(--muted);
}
.notice {
  font-size: 11px;
  color: var(--muted);
  margin: 7px 0 18px;
}
.notice.error {
  color: var(--warm);
  border-left: 2px solid var(--warm);
  padding: 12px;
}
.observation-layout {
  display: grid;
  grid-template-columns: minmax(300px, 0.95fr) minmax(0, 1.55fr);
  gap: 36px;
  align-items: start;
}
.observation-panel {
  min-width: 0;
}
.observation-heading {
  display: flex;
  justify-content: space-between;
  gap: 16px;
  align-items: center;
  min-height: 64px;
}
.observation-heading .eyebrow {
  font-size: 9px;
  margin-bottom: 4px;
}
.observation-heading h2 {
  font-size: 18px;
}
.observation-heading .mono {
  color: var(--muted);
  font-size: 10px;
}
.scene-tabs {
  display: flex;
  gap: 6px;
  margin: 12px 0;
}
.scene-tabs button {
  font-size: 12px;
  min-height: 38px;
  padding: 8px 12px;
}
.habitat-frame {
  border: 1px solid #52644a;
  border-radius: 5px;
  overflow: hidden;
  background: #13201a;
}
.instrument-bar {
  display: flex;
  justify-content: space-between;
  color: #c5d3bf;
  padding: 9px 14px;
  font:
    10px/1.5 ui-monospace,
    monospace;
  border-bottom: 1px solid var(--line);
}
#time {
  color: var(--accent);
}
#habitat {
  display: block;
  width: 100%;
  height: auto;
}
#habitat.highlight-moss [data-trait="moss"] {
  stroke: #e1fbb1;
  stroke-width: 3;
  filter: drop-shadow(0 0 6px #c1ed8a);
}
.habitat-controls {
  padding: 11px 12px;
  display: flex;
  align-items: center;
  gap: 10px;
  border-top: 1px solid var(--line);
}
.habitat-controls button {
  white-space: nowrap;
  flex: 0 0 auto;
  padding: 8px 10px;
  font-size: 11px;
}
.habitat-controls input {
  min-width: 30px;
  width: 100%;
  accent-color: var(--accent);
}
#trace-moss {
  white-space: nowrap;
  border-left-color: #71845b;
}
.readings {
  display: grid;
  grid-template-columns: repeat(4, 1fr);
  border-bottom: 1px solid var(--line);
}
.readings > div {
  padding: 12px 10px;
}
.readings > div + div {
  border-left: 1px solid var(--line);
}
.readings span {
  display: block;
  font-size: 10px;
  color: var(--muted);
}
.readings strong {
  font-size: 14px;
  font-weight: 500;
}
.readings .is-missing {
  color: var(--warm);
  background: #30291e;
}
.decision-panel {
  padding: 23px 25px 20px;
  background: var(--panel);
  border: 1px solid var(--line);
  border-top: 2px solid #8ba56a;
  border-radius: 4px;
}
.decision-panel,
.observation-panel {
  scroll-margin-top: 24px;
}
.decision-panel .eyebrow {
  font-size: 9px;
}
.decision-panel > p:not(.eyebrow) {
  font-size: 13px;
  color: var(--muted);
}
.decision-panel h2 {
  font-size: 25px;
  line-height: 1.25;
}
.clue {
  padding: 15px 0;
  margin: 16px 0 2px;
  border-top: 1px solid var(--line);
  border-bottom: 1px solid var(--line);
}
.clue-label {
  font-size: 9px;
  color: var(--accent);
}
.clue p {
  font-size: 12px;
  color: var(--muted);
  margin-top: 6px;
}
.plan-tabs {
  display: flex;
  gap: 8px;
  margin-top: 18px;
}
.plan-tabs button {
  flex: 1;
  text-align: left;
  padding: 12px;
}
.plan-tabs span {
  font:
    10px ui-monospace,
    monospace;
  display: block;
  color: var(--muted);
}
.plan-tabs strong {
  display: block;
  font-size: 13px;
  font-weight: 500;
  margin-top: 4px;
}
.question {
  font-size: 12px;
  margin: 18px 0 10px;
}
.prediction-actions {
  display: grid;
  grid-template-columns: 1fr 1fr;
  gap: 8px;
}
.prediction-actions button {
  font-size: 12px;
  padding: 12px 8px;
}
.prediction-actions button:hover {
  border-color: var(--accent);
}
#skip-prediction {
  font-size: 13px;
  text-align: center;
  margin-top: 16px;
}
.result-facts {
  margin: 20px 0 0;
  border-top: 1px solid var(--line);
}
.result-facts > div {
  display: flex;
  align-items: baseline;
  justify-content: space-between;
  gap: 20px;
  padding: 11px 0;
  border-bottom: 1px solid var(--line);
}
.result-facts dt {
  font-size: 11px;
  color: var(--muted);
}
.result-facts dd {
  margin: 0;
  text-align: right;
  font:
    12px/1.5 ui-monospace,
    monospace;
  overflow-wrap: anywhere;
}
.takeaway {
  display: grid;
  grid-template-columns: 0.95fr 1.55fr;
  gap: 36px;
  padding: 32px 0;
  margin-top: 32px;
  border-top: 1px solid var(--line);
}
.takeaway h2 {
  max-width: 340px;
  font-size: 23px;
}
.takeaway p {
  margin-top: 0;
}
.takeaway > div > p:not(.eyebrow):not(.caption) {
  font-size: 14px;
  color: var(--text);
}
.takeaway .caption {
  margin-top: 12px;
}
.verdict {
  padding: 18px 0 0;
}
.verdict h3 {
  color: var(--accent);
}
.verdict p:not(.eyebrow) {
  font-size: 12px;
  line-height: 1.7;
}
.verdict .caption {
  color: var(--muted);
}
.decision-panel .interaction-note {
  font-size: 9px;
  color: var(--muted);
  margin-top: 14px;
}
.completion-mark {
  color: var(--accent);
  border: 1px solid #809b5e;
  padding: 10px 12px;
  font:
    11px/1.6 ui-monospace,
    monospace;
  letter-spacing: 0.06em;
  margin: 22px 0 18px;
}
.completion-mark::before {
  content: "✓ ";
  margin-right: 5px;
}
#completion > p {
  font-size: 12px;
}
#completion h3 {
  font-size: 24px;
}
#field-notebook {
  margin-top: 20px;
  border-top: 1px solid var(--line);
  padding-top: 16px;
}
#field-notebook p {
  font-size: 11px;
  color: var(--muted);
}
#about-result {
  color: var(--accent);
  text-align: left;
}
details {
  border-top: 1px solid var(--line);
  border-bottom: 1px solid var(--line);
  margin: 32px 0;
  padding: 18px 0;
}
summary {
  cursor: pointer;
  font-size: 13px;
  min-height: 24px;
}
summary .mono {
  float: right;
  color: var(--muted);
  font-size: 10px;
}
.evidence-content {
  padding: 20px 0;
}
.evidence-content > p {
  font-size: 12px;
  overflow-wrap: anywhere;
}
.evidence-grid {
  display: grid;
  grid-template-columns: 1fr 1fr;
  gap: 40px;
  margin-top: 28px;
}
.evidence-grid h3 {
  font-size: 15px;
}
.evidence-grid p,
.evidence-grid a {
  font-size: 12px;
  color: var(--muted);
}
.evidence-grid a {
  color: var(--accent);
}
#acceptance {
  list-style: none;
  padding: 0;
}
#acceptance li {
  display: flex;
  justify-content: space-between;
  gap: 12px;
  padding: 8px 0;
  border-bottom: 1px solid var(--line);
  font-size: 11px;
}
#acceptance strong {
  color: var(--accent);
  font-weight: 400;
  font-family: ui-monospace, monospace;
}
#trace {
  font:
    10px/1.8 ui-monospace,
    monospace;
  color: var(--muted);
}
#about-page {
  max-width: 1050px;
  margin: 0 auto;
  padding: 30px 0 20px;
}
#about-page > .eyebrow {
  margin-top: 28px;
}
#about-page > h1 {
  max-width: 850px;
}
.about-lead {
  font-size: 21px;
  color: var(--muted);
  max-width: 820px;
  margin-top: 24px;
}
.about-grid {
  display: grid;
  grid-template-columns: 1fr 1fr;
  gap: 36px 50px;
  margin-top: 44px;
}
#about-page section {
  margin-bottom: 28px;
}
#about-page section > h2 {
  margin-bottom: 20px;
}
#about-page section p,
#play-guide {
  font-size: 14px;
  color: var(--muted);
}
#about-page > section {
  padding-top: 24px;
  border-top: 1px solid var(--line);
}
.table-scroll {
  overflow-x: auto;
}
table {
  width: 100%;
  border-collapse: collapse;
  text-align: left;
}
th,
td {
  padding: 14px 16px;
  border-bottom: 1px solid var(--line);
  font-size: 13px;
}
th {
  font-weight: 500;
  color: var(--accent);
  background: var(--panel);
}
td {
  color: var(--muted);
}
td:first-child {
  width: 30%;
  color: var(--text);
}
.stack-grid {
  display: grid;
  grid-template-columns: repeat(3, 1fr);
  gap: 20px;
}
.stack-grid article {
  padding: 20px;
  border: 1px solid var(--line);
}
.stack-grid h3 {
  font-size: 14px;
}
.scope-grid {
  display: grid;
  grid-template-columns: repeat(3, 1fr);
  gap: 28px;
}
.scope-grid h3 {
  color: var(--accent);
  font-size: 15px;
}
#about-page details p {
  font-size: 13px;
  color: var(--muted);
}
#about-return {
  width: auto;
  padding-left: 28px;
  padding-right: 28px;
}
footer {
  border-top: 1px solid var(--line);
  padding: 24px 0 36px;
  display: flex;
  justify-content: space-between;
  gap: 20px;
  font-size: 10px;
  color: var(--muted);
}
.mote {
  animation: drift 7s ease-in-out infinite alternate;
}
@keyframes drift {
  to {
    transform: translate(7px, -9px);
  }
}
@media (prefers-reduced-motion: reduce) {
  .mote {
    animation: none;
  }
}
@media (min-width: 1500px) {
  .mission-head {
    padding-top: 48px;
    padding-bottom: 36px;
  }
  .observation-layout {
    gap: 36px;
  }
  .decision-panel {
    padding: 28px;
  }
}
@media (max-width: 1100px) {
  body {
    padding: 0 26px;
  }
  .condition-status {
    display: none;
  }
  .mission-head {
    gap: 30px;
    grid-template-columns: 1.2fr 1fr;
  }
  .observation-layout {
    grid-template-columns: minmax(290px, 1fr) minmax(0, 1.4fr);
    gap: 20px;
  }
  .habitat-controls {
    gap: 5px;
    padding: 10px 8px;
  }
  .habitat-controls button {
    padding: 8px 7px;
  }
  .decision-panel {
    padding: 20px;
  }
  .mission-head {
    padding-top: 28px;
  }
}
@media (max-width: 780px) {
  :lang(ja) #mission-title {
    font-size: clamp(30px, 9.4vw, 38px);
  }
  body {
    padding: 0 18px;
  }
  .masthead {
    padding: 18px 0;
    gap: 10px;
  }
  .wordmark {
    font-size: 11px;
  }
  nav {
    gap: 12px;
  }
  #about-open {
    font-size: 11px;
    max-width: 100px;
  }
  .language button {
    padding: 8px;
    font-size: 11px;
  }
  .mission-head {
    display: block;
    padding: 28px 0 22px;
  }
  .mission-context {
    font-size: 12px;
  }
  .mission-brief {
    margin-top: 30px;
    padding: 0 0 0 18px;
  }
  .mission-brief p {
    margin-top: 7px;
  }
  .duration {
    margin-top: 8px;
  }
  .conditions li {
    padding: 0;
  }
  .conditions button {
    display: block;
    padding: 14px 9px;
    min-height: 134px;
  }
  .case-arrow {
    display: none;
  }
  .case-copy {
    display: block;
  }
  .condition-index {
    font-size: 10px;
  }
  .conditions strong {
    font-size: 14px;
  }
  .case-description {
    font-size: 10px;
    line-height: 1.5;
  }
  .conditions li:first-child {
    padding-left: 0;
  }
  .record-strip {
    display: block;
    padding: 13px 0;
  }
  .record-strip p {
    margin-top: 5px;
    font-size: 11px;
  }
  .hero-actions {
    flex-wrap: wrap;
    gap: 6px 18px;
  }
  .hero-actions .text-button {
    font-size: 12px;
  }
  .stage-line {
    font-size: 9px;
    gap: 12px;
    align-items: center;
  }
  .stage-line span:last-child {
    text-align: right;
    max-width: 85px;
  }
  .observation-layout {
    grid-template-columns: 1fr;
    gap: 20px;
  }
  .takeaway {
    grid-template-columns: 1fr;
    gap: 18px;
  }
  .observation-heading h2 {
    font-size: 17px;
  }
  .decision-panel {
    padding: 23px;
  }
  .habitat-controls {
    gap: 7px;
  }
  .habitat-controls button {
    font-size: 10px;
    min-height: 44px;
  }
  .scene-tabs button {
    min-height: 44px;
  }
  .notice {
    font-size: 10px;
  }
  .readings > div {
    padding: 12px 8px;
  }
  .readings strong {
    font-size: 13px;
  }
  summary .mono {
    display: none;
  }
  .evidence-grid,
  .about-grid,
  .stack-grid,
  .scope-grid {
    grid-template-columns: 1fr;
    gap: 24px;
  }
  .about-grid {
    margin-top: 30px;
  }
  #about-page h1 {
    font-size: 36px;
  }
  .about-lead {
    font-size: 18px;
  }
  .stack-grid article {
    padding: 18px;
  }
  td,
  th {
    padding: 12px 8px;
    font-size: 12px;
  }
  td:first-child {
    width: 35%;
  }
  footer {
    display: block;
  }
  footer span {
    display: block;
    margin-top: 8px;
  }
  .mission-goal {
    font-size: 17px;
  }
}