.world-tree-lesson {
  --tree-cyan: #7bdcff;
  --tree-amber: #ffc45c;
  --tree-danger: #ff8178;
  --tree-ink: #101410;
}
.world-tree-lesson .hero h1 span {
  display: block;
}
.world-tree-lesson .section-code {
  margin: 0 0 12px;
  color: var(--v2-accent);
  font:
    900 0.75rem/1.2 "Space Grotesk",
    sans-serif;
  letter-spacing: 0.14em;
  text-transform: uppercase;
}
.world-tree-lesson .block-header {
  align-items: start;
}
.world-tree-lesson .block-header .section-code {
  grid-column: 1/-1;
  margin-bottom: -14px;
}
.world-tree-lesson .root-figure {
  margin: 0;
}
.world-tree-lesson .root-figure figcaption {
  padding: 12px 0;
  color: var(--v2-muted);
  font-size: 0.88rem;
}
.world-tree-lesson .root-facts {
  display: grid;
  grid-template-columns: 1.2fr 0.8fr 0.8fr;
  margin-top: 18px;
  border-block: 1px solid var(--v2-line);
}
.world-tree-lesson .root-facts div {
  min-width: 0;
  padding: 22px 24px;
  border-inline-end: 1px solid var(--v2-line);
}
.world-tree-lesson .root-facts div:last-child {
  border: 0;
}
.world-tree-lesson .root-facts strong,
.world-tree-lesson .root-facts span {
  display: block;
}
.world-tree-lesson .root-facts strong {
  margin-bottom: 8px;
  color: var(--v2-accent);
  font-size: 0.78rem;
  letter-spacing: 0.08em;
}
.world-tree-lesson .root-facts span {
  font-weight: 750;
}
.tree-progress {
  display: flex;
  align-items: center;
  justify-content: space-between;
  gap: 20px;
  margin-bottom: 24px;
  padding-block: 14px;
  border-block: 1px solid var(--v2-line);
}
.tree-progress b {
  color: var(--v2-accent);
  font-size: 1.4rem;
}
.tree-reset {
  min-height: 44px;
  padding: 0 14px;
  color: var(--v2-muted);
  background: transparent;
  border: 1px solid var(--v2-line);
  border-radius: 6px;
  cursor: pointer;
}
.tree-reset:hover {
  color: var(--v2-text);
  border-color: #5f665f;
}
.world-tree-map {
  position: relative;
  display: grid;
  grid-template-columns: minmax(0, 1fr) 150px minmax(0, 1fr);
  grid-template-rows: repeat(4, minmax(112px, auto));
  gap: 14px 34px;
  align-items: stretch;
  isolation: isolate;
}
.tree-trunk {
  position: relative;
  z-index: 0;
  grid-column: 2;
  grid-row: 1/5;
  display: flex;
  flex-direction: column;
  align-items: center;
  justify-content: space-between;
  padding: 26px 8px;
  color: var(--v2-accent);
  text-align: center;
  font-size: 0.78rem;
  font-weight: 900;
  letter-spacing: 0.08em;
}
.tree-trunk i {
  position: absolute;
  z-index: -1;
  inset: 62px 50% 62px auto;
  width: 2px;
  background: linear-gradient(var(--v2-accent), #708800 70%, var(--tree-cyan));
}
.tree-trunk span,
.tree-trunk strong {
  padding: 8px 10px;
  color: var(--tree-ink);
  background: var(--v2-accent);
  border-radius: 4px;
}
.tree-trunk strong {
  color: #071014;
  background: var(--tree-cyan);
}
.universe-node {
  position: relative;
  z-index: 1;
  grid-row: var(--row);
  grid-column: var(--side);
  display: grid;
  grid-template-columns: 54px minmax(0, 1fr);
  grid-template-rows: auto auto;
  gap: 2px 14px;
  align-content: center;
  min-width: 0;
  min-height: 104px;
  padding: 18px 20px;
  color: var(--v2-text);
  text-align: left;
  background: var(--v2-panel);
  border: 1px solid var(--v2-line);
  border-radius: 8px;
  cursor: pointer;
  transition:
    transform 220ms var(--v2-ease),
    border-color 180ms ease,
    background 180ms ease;
}
.universe-node::after {
  content: "";
  position: absolute;
  top: 50%;
  width: 35px;
  height: 1px;
  background: var(--v2-line);
}
.universe-node:nth-of-type(2n + 1)::after {
  right: -35px;
}
.universe-node:nth-of-type(2n)::after {
  left: -35px;
}
.universe-node > span {
  grid-row: 1/3;
  align-self: center;
  color: var(--v2-accent);
  font:
    900 1.1rem/1 "Space Grotesk",
    sans-serif;
}
.universe-node strong {
  min-width: 0;
  font-size: 1.08rem;
  line-height: 1.3;
  overflow-wrap: anywhere;
}
.universe-node small {
  min-width: 0;
  color: var(--v2-muted);
  font-size: 0.82rem;
  line-height: 1.4;
}
.universe-node:hover {
  transform: translateY(-2px);
  border-color: #6a7f12;
}
.universe-node[aria-pressed="true"] {
  color: var(--tree-ink);
  background: var(--v2-accent);
  border-color: var(--v2-accent);
}
.universe-node[aria-pressed="true"] > span,
.universe-node[aria-pressed="true"] small {
  color: #202800;
}
.universe-node.is-explored::before {
  content: "已回測";
  position: absolute;
  top: 8px;
  right: 9px;
  color: var(--tree-cyan);
  font-size: 0.68rem;
  font-weight: 900;
  letter-spacing: 0.06em;
}
.universe-node[aria-pressed="true"].is-explored::before {
  color: #233000;
}
.universe-lab {
  min-height: 520px;
}
.lab-empty {
  max-width: 740px;
  padding: 42px;
  border: 1px dashed #4a514a;
  background: var(--v2-panel);
}
.lab-empty p:last-child {
  max-width: 36rem;
  color: var(--v2-muted);
}
.lab-content {
  display: grid;
  gap: 26px;
}
.lab-content[hidden] {
  display: none;
}
.world-tree-lesson .action[hidden] {
  display: none;
}
.lab-heading {
  display: grid;
  grid-template-columns: minmax(0, 0.8fr) minmax(280px, 1fr);
  gap: clamp(28px, 7vw, 88px);
  align-items: end;
}
.lab-heading h2 {
  max-width: 12em;
}
.lab-heading > p {
  margin: 0;
  color: var(--v2-muted);
  font-size: 1.04rem;
}
.condition-lock {
  display: grid;
  grid-template-columns: 0.8fr 1.2fr;
  border-block: 1px solid var(--v2-line);
}
.condition-lock > div {
  min-width: 0;
  padding: 22px 24px;
}
.condition-lock > div:first-child {
  background: var(--v2-accent);
  color: var(--tree-ink);
}
.condition-lock span {
  display: block;
  margin-bottom: 8px;
  font-size: 0.75rem;
  font-weight: 900;
  letter-spacing: 0.08em;
}
.condition-lock strong {
  font-size: 1.2rem;
}
.condition-lock p {
  margin: 0;
  color: var(--v2-muted);
}
.focus-compare {
  display: grid;
  grid-template-columns: 1fr 1fr;
  gap: 1px;
  background: var(--v2-line);
  border: 1px solid var(--v2-line);
}
.focus-compare[hidden],
.pri-boundary[hidden] {
  display: none;
}
.focus-compare article {
  padding: 24px;
  background: var(--v2-panel);
}
.focus-compare span {
  color: var(--v2-accent);
  font-size: 0.75rem;
  font-weight: 900;
  letter-spacing: 0.08em;
}
.focus-compare strong {
  display: block;
  margin: 9px 0;
  font-size: 1.2rem;
}
.focus-compare p {
  margin: 0;
  color: var(--v2-muted);
}
.pri-boundary {
  padding: 26px;
  border-inline-start: 5px solid var(--tree-cyan);
  background: #7bdcff0d;
}
.pri-boundary > strong {
  display: block;
  margin-bottom: 12px;
  color: var(--tree-cyan);
  font-size: 1.2rem;
}
.pri-boundary p {
  margin: 8px 0;
  color: #d0d7d0;
}
.prediction-set,
.interpret-set {
  min-width: 0;
  margin: 0;
  padding: 0;
  border: 0;
}
.prediction-set legend,
.interpret-set legend {
  margin-bottom: 16px;
  font:
    850 1.25rem/1.4 "Space Grotesk",
    "Noto Sans TC",
    sans-serif;
}
.prediction-set > div,
.interpret-set > div {
  display: grid;
  grid-template-columns: repeat(3, minmax(0, 1fr));
  gap: 10px;
}
.lab-option {
  position: relative;
  display: flex;
  align-items: flex-start;
  min-width: 0;
  min-height: 110px;
  padding: 18px;
  color: var(--v2-text);
  background: var(--v2-panel);
  border: 1px solid var(--v2-line);
  border-radius: 8px;
  cursor: pointer;
}
.lab-option input {
  position: absolute;
  inset: 0;
  opacity: 0;
  cursor: pointer;
}
.lab-option span {
  display: block;
  min-width: 0;
  line-height: 1.45;
  overflow-wrap: anywhere;
}
.lab-option:has(input:checked) {
  color: var(--tree-ink);
  background: var(--v2-accent);
  border-color: var(--v2-accent);
}
.universe-result {
  display: grid;
  grid-template-columns: 0.72fr 1.28fr;
  gap: 18px;
  padding-block: 28px;
  border-block: 1px solid var(--v2-line);
}
.universe-result[hidden],
.interpret-set[hidden],
.dead-end[hidden],
.interpret-feedback[hidden],
.retest-result[hidden] {
  display: none;
}
.result-state {
  padding: 28px;
  background: var(--v2-paper);
  color: #151915;
}
.result-state > span {
  font-size: 0.74rem;
  font-weight: 900;
  letter-spacing: 0.1em;
}
.result-state h3 {
  margin: 18px 0 10px;
  font-size: clamp(1.45rem, 3vw, 2.2rem);
  line-height: 1.2;
}
.result-state p {
  margin: 0;
}
.claim-boundary {
  display: grid;
  gap: 1px;
  background: var(--v2-line);
  border: 1px solid var(--v2-line);
}
.claim-boundary article {
  padding: 22px;
  background: var(--v2-panel);
}
.claim-boundary article:last-child {
  background: #17110f;
}
.claim-boundary strong {
  color: var(--v2-accent);
}
.claim-boundary article:last-child strong {
  color: var(--tree-danger);
}
.claim-boundary p {
  margin: 6px 0 0;
}
.dead-end {
  padding: 28px;
  background: #251210;
  border: 1px solid #8e403a;
}
.dead-end .section-code,
.dead-end h3 {
  color: var(--tree-danger);
}
.dead-end h3 {
  font-size: 1.7rem;
}
.interpret-feedback {
  padding: 22px;
  border-inline-start: 5px solid var(--v2-accent);
  background: var(--v2-panel);
}
.portal-button {
  display: grid;
  grid-template-columns: 110px 1fr;
  gap: 4px 20px;
  min-height: 96px;
  padding: 18px 22px;
  color: #061217;
  text-align: left;
  background: var(--tree-cyan);
  border: 0;
  border-radius: 8px;
  cursor: pointer;
  transition:
    transform 220ms var(--v2-ease),
    filter 180ms ease;
}
.portal-button[hidden] {
  display: none;
}
.portal-button span {
  grid-row: 1/3;
  align-self: center;
  font-size: 0.76rem;
  font-weight: 950;
  letter-spacing: 0.14em;
}
.portal-button strong {
  font-size: 1.25rem;
}
.portal-button small {
  font-size: 0.86rem;
}
.portal-button:hover {
  transform: translateX(3px);
  filter: brightness(1.05);
}
.retest-result {
  padding: 30px;
  border: 1px solid #27697e;
  background: #0d1b20;
}
.retest-result h3 {
  margin: 0 0 12px;
  color: var(--tree-cyan);
  font-size: clamp(1.5rem, 3vw, 2.2rem);
}
.mentor-verdict {
  display: grid;
  grid-template-columns: 180px 1fr;
  gap: 22px;
  margin-top: 24px;
  padding-top: 22px;
  border-top: 1px solid #31505a;
}
.mentor-verdict strong {
  color: var(--v2-accent);
}
.mentor-verdict p {
  margin: 0;
}
.load-threshold {
  display: grid;
  grid-template-columns: repeat(4, minmax(0, 1fr));
  gap: 10px;
  align-items: end;
  min-height: 340px;
  padding: 30px 24px 20px;
  background: var(--v2-panel);
  border: 1px solid var(--v2-line);
}
.load-threshold div {
  display: grid;
  grid-template-rows: 28px 1fr auto;
  align-items: end;
  height: 100%;
  text-align: center;
}
.load-threshold span {
  align-self: start;
  color: var(--v2-accent);
  font-weight: 900;
}
.load-threshold i {
  display: block;
  width: 62%;
  height: calc(24px + var(--level) * 180px);
  margin: auto;
  background: linear-gradient(
    to top,
    var(--v2-accent),
    var(--tree-amber) 64%,
    var(--tree-danger)
  );
}
.load-threshold strong {
  min-height: 52px;
  padding-top: 12px;
  font-size: 0.86rem;
}
.world-quote {
  max-width: 47rem;
  margin: 30px 0 0;
  padding: 0;
  border: 0;
  color: var(--v2-text);
  font-size: clamp(1.35rem, 3vw, 2.25rem);
  font-weight: 850;
  line-height: 1.42;
}
.world-rules {
  counter-reset: rule;
  display: grid;
  gap: 1px;
  margin: 0;
  padding: 0;
  background: var(--v2-line);
  border: 1px solid var(--v2-line);
  list-style: none;
}
.world-rules li {
  counter-increment: rule;
  display: grid;
  grid-template-columns: 68px 210px 1fr;
  gap: 22px;
  align-items: center;
  min-height: 92px;
  padding: 18px 24px;
  background: var(--v2-panel);
}
.world-rules li::before {
  content: "0" counter(rule);
  color: var(--v2-accent);
  font-size: 1.35rem;
  font-weight: 900;
}
.world-rules span {
  color: var(--v2-muted);
}
.universe-reference {
  display: grid;
  gap: 1px;
  background: var(--v2-line);
  border: 1px solid var(--v2-line);
}
.universe-reference details {
  background: var(--v2-panel);
}
.universe-reference summary {
  min-height: 56px;
  display: flex;
  align-items: center;
  padding: 10px 18px;
  font-weight: 850;
  cursor: pointer;
}
.universe-reference summary::marker {
  color: var(--v2-accent);
}
.universe-reference p {
  margin: 0;
  padding: 0 18px 20px;
  color: var(--v2-muted);
}
.evidence-note {
  padding: 34px 0;
  color: var(--v2-muted);
  font-size: 0.88rem;
}
.evidence-note h2 {
  font-size: 1.1rem;
  color: var(--v2-text);
}
.evidence-note ul {
  display: flex;
  flex-wrap: wrap;
  gap: 8px 24px;
  margin: 14px 0 0;
  padding: 0;
  list-style: none;
}
.evidence-note a {
  text-decoration-color: #647819;
  text-underline-offset: 4px;
}
@container (max-width:760px) {
  .prediction-set > div,
  .interpret-set > div {
    grid-template-columns: 1fr;
  }
}
@media (max-width: 840px) {
  .world-tree-lesson .root-facts {
    grid-template-columns: 1fr;
  }
  .world-tree-lesson .root-facts div {
    border-inline-end: 0;
    border-bottom: 1px solid var(--v2-line);
  }
  .world-tree-lesson .root-facts div:last-child {
    border-bottom: 0;
  }
  .lab-heading,
  .condition-lock,
  .universe-result {
    grid-template-columns: 1fr;
  }
  .focus-compare {
    grid-template-columns: 1fr;
  }
  .prediction-set > div,
  .interpret-set > div {
    grid-template-columns: 1fr;
  }
  .mentor-verdict {
    grid-template-columns: 1fr;
    gap: 8px;
  }
  .world-rules li {
    grid-template-columns: 54px 1fr;
  }
  .world-rules span {
    grid-column: 2;
  }
  .load-threshold {
    min-height: 300px;
    padding-inline: 12px;
  }
  .load-threshold strong {
    font-size: 0.76rem;
  }
  .evidence-note ul {
    display: grid;
  }
}
@media (max-width: 680px) {
  .world-tree-map {
    grid-template-columns: 1fr;
    grid-template-rows: auto;
    gap: 10px;
  }
  .tree-trunk {
    grid-column: 1;
    grid-row: 1;
    min-height: 92px;
    display: grid;
    grid-template-columns: 1fr 50px 1fr;
    gap: 10px;
    padding: 12px;
  }
  .tree-trunk i {
    position: static;
    width: 100%;
    height: 2px;
  }
  .universe-node {
    grid-column: 1 !important;
    grid-row: auto !important;
    min-height: 88px;
  }
  .universe-node::after {
    display: none;
  }
  .universe-node:nth-of-type(n) {
    grid-row: auto;
  }
  .lab-empty {
    padding: 28px 22px;
  }
  .load-threshold {
    grid-template-columns: repeat(2, minmax(0, 1fr));
    min-height: 520px;
  }
  .world-rules li {
    padding-inline: 16px;
  }
  .portal-button {
    grid-template-columns: 1fr;
  }
  .portal-button span {
    grid-row: auto;
  }
  .universe-node.is-explored::before {
    position: static;
    grid-column: 2;
    grid-row: 1;
    justify-self: end;
  }
}
@media (max-width: 390px) {
  .load-threshold {
    min-height: 500px;
  }
  .lab-option {
    min-height: 92px;
  }
  .tree-progress {
    align-items: flex-start;
    flex-direction: column;
  }
  .tree-reset {
    width: 100%;
  }
}
@media (prefers-reduced-motion: reduce) {
  .universe-node,
  .portal-button {
    transition: none;
  }
  .universe-node:hover,
  .portal-button:hover {
    transform: none;
  }
}
@media print {
  .world-tree-map {
    display: grid;
    grid-template-columns: 1fr 1fr;
  }
  .tree-trunk,
  .tree-progress,
  .portal-button,
  .prediction-set,
  .interpret-set {
    display: none;
  }
  .universe-node {
    grid-column: auto !important;
    grid-row: auto !important;
  }
  .lab-empty {
    display: none;
  }
}