.q26,
.q26-m {
  --q26-gold-ink: #7a5717;
  --q26-gold-soft: #dcc9a5;
  --q26-gold-wash: #fbf6ea;
  --q26-mono: "SFMono-Regular", "Menlo", "Consolas", "Liberation Mono", "Courier New", monospace;
  color: var(--ink);
  font-family: var(--font-sans);
}

.q26 {
  position: absolute;
  inset: 0;
  display: flex;
  flex-direction: column;
  padding: 44px 64px 30px;
  background: var(--paper);
}

.q26 *,
.q26-m * {
  box-sizing: border-box;
}

.q26 [hidden],
.q26-m [hidden] {
  display: none !important;
}

/* head */

.q26-head {
  flex: 0 0 auto;
  display: flex;
  align-items: flex-end;
  justify-content: space-between;
  gap: 32px;
  padding-bottom: 12px;
  border-bottom: 1px solid var(--line);
  margin-bottom: 16px;
}

.q26-title {
  margin: 0;
  max-width: 1000px;
  font-size: 40px;
  line-height: 1.32;
  font-weight: 600;
  letter-spacing: 0;
  color: var(--navy);
}

.q26-head-meta {
  flex: 0 0 auto;
  text-align: right;
  padding-bottom: 2px;
}

.q26-mark {
  margin: 0;
  font-size: 16px;
  line-height: 1.5;
  letter-spacing: 0.02em;
  color: var(--muted);
  white-space: nowrap;
}

.q26-state {
  margin: 6px 0 0;
  font-size: 18px;
  line-height: 1.5;
  color: var(--muted);
  font-variant-numeric: tabular-nums;
}

/* body and scenes */

.q26-body {
  flex: 1 1 auto;
  min-height: 0;
}

.q26-scene {
  height: 100%;
  min-height: 0;
}

.q26-scene-b0 {
  display: grid;
  grid-template-columns: minmax(0, 560px) minmax(0, 1fr);
  gap: 32px;
  align-items: stretch;
}

.q26-scene-b1,
.q26-scene-b2 {
  display: flex;
  flex-direction: column;
  gap: 14px;
}

/* premise */

.q26-premise {
  min-width: 0;
  display: flex;
  flex-direction: column;
  padding: 22px 24px;
  background: var(--white);
  border: 1px solid var(--line);
  border-radius: 14px;
}

.q26-sec-title {
  margin: 0 0 16px;
  font-size: 19px;
  line-height: 1.4;
  font-weight: 600;
  letter-spacing: 0.02em;
  color: var(--muted);
}

.q26-flow {
  list-style: none;
  margin: 0;
  padding: 0;
  display: flex;
  flex-direction: column;
}

.q26-flow-step {
  position: relative;
  display: grid;
  grid-template-columns: 18px minmax(0, 1fr);
  gap: 14px;
  padding-bottom: 22px;
}

.q26-flow-step:last-child {
  padding-bottom: 0;
}

.q26-flow-step::before {
  content: "";
  position: absolute;
  left: 5px;
  top: 18px;
  bottom: 0;
  width: 1px;
  background: var(--line);
}

.q26-flow-step:last-child::before {
  display: none;
}

.q26-dot {
  width: 11px;
  height: 11px;
  margin-top: 6px;
  border-radius: 50%;
  background: var(--gold);
}

.q26-flow-body {
  min-width: 0;
}

.q26-flow-name {
  margin: 0;
  font-size: 22px;
  line-height: 1.35;
  font-weight: 600;
  color: var(--navy);
}

.q26-flow-name b {
  font-weight: 600;
  color: var(--ink);
}

.q26-flow-note {
  margin: 5px 0 0;
  font-size: 16px;
  line-height: 1.55;
  color: var(--muted);
}

.q26-zero {
  margin: auto 0 0;
  padding: 14px 16px;
  background: var(--q26-gold-wash);
  border-radius: 10px;
  font-size: 17px;
  line-height: 1.55;
  color: var(--ink);
}

.q26-zero-k {
  display: inline-block;
  margin-right: 8px;
  font-size: 14px;
  line-height: 1.4;
  font-weight: 600;
  letter-spacing: 0.06em;
  color: var(--q26-gold-ink);
}

/* charts */

.q26-chart {
  min-width: 0;
  min-height: 0;
  display: flex;
  flex-direction: column;
  padding: 16px 18px 14px;
  background: var(--white);
  border: 1px solid var(--line);
  border-radius: 14px;
}

.q26-chart-head {
  flex: 0 0 auto;
  display: flex;
  align-items: baseline;
  justify-content: space-between;
  gap: 14px;
}

.q26-chart-title {
  margin: 0;
  font-size: 21px;
  line-height: 1.35;
  font-weight: 600;
  color: var(--navy);
}

.q26-chart-title-sm {
  font-size: 19px;
}

.q26-chart-tag {
  flex: 0 0 auto;
  font-size: 15px;
  line-height: 1.4;
  letter-spacing: 0.02em;
  color: var(--q26-gold-ink);
  white-space: nowrap;
}

.q26-axis {
  flex: 0 0 auto;
  list-style: none;
  margin: 10px 0 0;
  padding: 0;
  display: flex;
  flex-wrap: wrap;
  gap: 6px 20px;
}

.q26-axis li {
  min-width: 0;
  display: flex;
  align-items: baseline;
  gap: 8px;
  font-size: 16px;
  line-height: 1.4;
  color: var(--muted);
}

.q26-axis-k {
  font-size: 14px;
  line-height: 1.4;
  font-weight: 600;
  letter-spacing: 0.06em;
  color: var(--q26-gold-ink);
  white-space: nowrap;
}

.q26-axis b {
  font-size: 17px;
  line-height: 1.4;
  font-weight: 600;
  color: var(--ink);
}

.q26-axis-v {
  font-size: 15px;
  line-height: 1.4;
  color: var(--muted);
  font-variant-numeric: tabular-nums;
  white-space: nowrap;
}

.q26-axis-tight {
  gap: 4px 16px;
}

.q26-axis-tight li {
  font-size: 15px;
}

.q26-axis-tight b {
  font-size: 16px;
}

.q26-figure {
  flex: 1 1 auto;
  min-height: 0;
  margin: 8px 0 0;
  display: flex;
  align-items: center;
  justify-content: center;
}

.q26-figure img {
  display: block;
  width: 100%;
  height: 100%;
  object-fit: contain;
}

.q26-source {
  flex: 0 0 auto;
  margin: 10px 0 0;
  font-size: 15px;
  line-height: 1.45;
  color: var(--muted);
}

/* b1 */

.q26-chart-row {
  flex: 1 1 auto;
  min-height: 0;
  display: grid;
  grid-template-columns: repeat(2, minmax(0, 1fr));
  gap: 20px;
}

.q26-observe {
  flex: 0 0 auto;
  margin: 0;
  display: flex;
  align-items: baseline;
  gap: 12px;
  padding: 10px 16px;
  background: var(--q26-gold-wash);
  border-radius: 10px;
  font-size: 17px;
  line-height: 1.5;
  color: var(--ink);
}

.q26-observe-k {
  flex: 0 0 auto;
  font-size: 14px;
  line-height: 1.5;
  font-weight: 600;
  letter-spacing: 0.08em;
  color: var(--q26-gold-ink);
  white-space: nowrap;
}

/* b2 */

.q26-compare {
  flex: 1 1 auto;
  min-height: 0;
  display: grid;
  grid-template-columns: repeat(2, minmax(0, 1fr));
  gap: 20px;
}

.q26-chart-b2 {
  padding: 14px 18px 12px;
}

.q26-role-group {
  min-width: 0;
  display: flex;
  align-items: baseline;
  gap: 10px;
}

.q26-role {
  display: inline-block;
  font-size: 14px;
  line-height: 1.4;
  font-weight: 600;
  letter-spacing: 0.06em;
  color: var(--q26-gold-ink);
  white-space: nowrap;
}

.q26-boundary {
  flex: 0 0 auto;
  padding: 16px 20px 18px;
  background: var(--white);
  border: 1px solid var(--line);
  border-top: 3px solid var(--gold);
  border-radius: 12px;
}

.q26-verdict {
  margin: 0;
  font-size: 26px;
  line-height: 1.4;
  font-weight: 600;
  color: var(--navy);
}

.q26-verdict b {
  font-weight: 600;
  color: var(--navy);
  text-decoration: underline;
  text-decoration-color: var(--gold);
  text-decoration-thickness: 2px;
  text-underline-offset: 5px;
}

.q26-boundary-list {
  list-style: none;
  margin: 10px 0 0;
  padding: 0;
  display: grid;
  grid-template-columns: repeat(2, minmax(0, 1fr));
  gap: 8px 24px;
}

.q26-boundary-list li {
  min-width: 0;
  font-size: 16px;
  line-height: 1.5;
  color: var(--ink);
}

.q26-boundary-list b {
  display: block;
  margin-bottom: 2px;
  font-size: 14px;
  line-height: 1.5;
  font-weight: 600;
  letter-spacing: 0.06em;
  color: var(--muted);
}

/* foot */

.q26-foot {
  flex: 0 0 132px;
  min-height: 0;
  padding-top: 12px;
  border-top: 2px solid var(--gold);
}

.q26-foot-group {
  height: 100%;
  display: flex;
  flex-direction: column;
  justify-content: center;
  gap: 6px;
}

.q26-foot-key {
  margin: 0;
  font-size: 27px;
  line-height: 1.4;
  font-weight: 600;
  color: var(--navy);
}

.q26-foot-note {
  margin: 0;
  font-size: 19px;
  line-height: 1.5;
  color: var(--muted);
}

.q26-question {
  margin: 0;
  font-size: 29px;
  line-height: 1.4;
  font-weight: 600;
  color: var(--navy);
}

.q26-question-sub {
  margin: 0;
  font-size: 18px;
  line-height: 1.5;
  color: var(--muted);
}

/* mobile document flow */

.q26-m {
  min-width: 0;
}

.q26-m .q26-head {
  display: block;
  padding-bottom: 14px;
  margin-bottom: 20px;
}

.q26-m .q26-title {
  max-width: none;
  font-size: 27px;
  line-height: 1.4;
}

.q26-m .q26-head-meta {
  text-align: left;
  margin-top: 8px;
}

.q26-m .q26-mark {
  font-size: 14px;
  white-space: normal;
}

.q26-m .q26-state {
  margin-top: 4px;
  font-size: 15px;
  line-height: 1.6;
}

.q26-m .q26-body {
  display: block;
}

.q26-m .q26-scene {
  height: auto;
}

.q26-m .q26-scene-b0,
.q26-m .q26-scene-b1,
.q26-m .q26-scene-b2 {
  display: flex;
  flex-direction: column;
  gap: 14px;
}

.q26-m .q26-premise {
  padding: 18px;
}

.q26-m .q26-sec-title {
  margin-bottom: 14px;
  font-size: 17px;
}

.q26-m .q26-flow-step {
  gap: 12px;
  padding-bottom: 18px;
}

.q26-m .q26-flow-name {
  font-size: 19px;
}

.q26-m .q26-flow-note {
  font-size: 15px;
  line-height: 1.65;
}

.q26-m .q26-zero {
  margin-top: 4px;
  padding: 12px 14px;
  font-size: 15px;
  line-height: 1.65;
}

.q26-m .q26-chart {
  padding: 14px 14px 12px;
}

.q26-m .q26-chart-head {
  display: block;
}

.q26-m .q26-chart-title {
  font-size: 18px;
  line-height: 1.45;
}

.q26-m .q26-chart-title-sm {
  font-size: 17px;
}

.q26-m .q26-chart-tag {
  display: block;
  margin-top: 4px;
  font-size: 13px;
  white-space: normal;
}

.q26-m .q26-axis {
  display: block;
  margin-top: 8px;
}

.q26-m .q26-axis li {
  display: flex;
  gap: 8px;
  font-size: 15px;
  line-height: 1.6;
}

.q26-m .q26-axis li + li {
  margin-top: 2px;
}

.q26-m .q26-axis b {
  font-size: 15px;
}

.q26-m .q26-axis-v {
  font-size: 13px;
}

.q26-m .q26-figure {
  display: block;
  height: auto;
  margin-top: 8px;
}

.q26-m .q26-figure img {
  width: 100%;
  height: auto;
  object-fit: contain;
}

.q26-m .q26-source {
  margin-top: 8px;
  font-size: 13px;
  line-height: 1.6;
}

.q26-m .q26-chart-row,
.q26-m .q26-compare {
  flex: none;
  display: flex;
  flex-direction: column;
  gap: 12px;
}

.q26-m .q26-observe {
  display: block;
  padding: 12px 14px;
  font-size: 15px;
  line-height: 1.65;
}

.q26-m .q26-observe-k {
  display: inline-block;
  margin-right: 8px;
}

.q26-m .q26-role-group {
  display: block;
}

.q26-m .q26-role {
  display: block;
  margin-bottom: 2px;
}

.q26-m .q26-boundary {
  padding: 14px 14px 16px;
}

.q26-m .q26-verdict {
  font-size: 20px;
  line-height: 1.5;
}

.q26-m .q26-boundary-list {
  grid-template-columns: minmax(0, 1fr);
  gap: 8px;
  margin-top: 10px;
}

.q26-m .q26-boundary-list li {
  font-size: 15px;
  line-height: 1.65;
}

.q26-m .q26-boundary-list b {
  font-size: 13px;
}

.q26-m .q26-foot {
  flex: none;
  height: auto;
  margin-top: 22px;
  padding-top: 14px;
  overflow: visible;
}

.q26-m .q26-foot-group {
  height: auto;
  gap: 6px;
}

.q26-m .q26-foot-key {
  font-size: 20px;
  line-height: 1.55;
}

.q26-m .q26-foot-note {
  font-size: 15px;
  line-height: 1.65;
}

.q26-m .q26-question {
  font-size: 21px;
  line-height: 1.55;
}

.q26-m .q26-question-sub {
  font-size: 15px;
  line-height: 1.65;
}

.q26-m-link {
  margin: 24px 0 0;
  font-size: 15px;
  line-height: 1.6;
}

.is-instant .q26 *,
.is-instant .q26-m * {
  transition: none !important;
  animation: none !important;
}

@media (prefers-reduced-motion: reduce) {
  .q26 *,
  .q26-m * {
    transition: none !important;
    animation: none !important;
  }
}

/* Research choice and positive scientific implication, keeping the original graph scenes. */
.q26-research-scene{display:flex;flex-direction:column;justify-content:center;gap:25px;padding:10px 12px}
.q26-research-context{margin:0;color:var(--muted);font-size:23px;line-height:1.5}
.q26-research-given{margin:0;font-size:30px;line-height:1.6;color:var(--navy)}
.q26-research-options{display:grid;grid-template-columns:1fr 1fr;gap:38px}
.q26-research-options article{border-top:4px solid var(--gold);padding:24px 25px;background:#f3f5f7}
.q26-research-options span,.q26-research-test span{font-size:21px;color:var(--muted)}
.q26-research-options h2{font-size:36px;line-height:1.35;margin:14px 0 12px;color:var(--navy)}
.q26-research-options p{font-size:27px;line-height:1.5;margin:0}
.q26-research-prompt{margin:0;font-size:35px;line-height:1.5;color:var(--navy);font-weight:650}
.q26-research-takeaway{font-size:40px;line-height:1.4;margin:0;color:var(--navy)}
.q26-research-test{display:grid;grid-template-columns:1fr 1fr 1fr;gap:26px;border-top:2px solid var(--line);padding-top:22px}
.q26-research-test p{font-size:27px;line-height:1.55;margin:10px 0 0;color:var(--navy)}
.q26-research-revise{font-size:27px;line-height:1.6;margin:0}
.q26-research-origin{font-size:20px;line-height:1.5;margin:0;color:var(--muted)}
.q26-m .q26-research-scene{gap:18px;padding:8px 0}
.q26-m .q26-research-options,.q26-m .q26-research-test{grid-template-columns:1fr;gap:16px}
.q26-m .q26-research-options article{padding:16px}
.q26-m .q26-research-context,.q26-m .q26-research-origin,.q26-m .q26-research-options span,.q26-m .q26-research-test span{font-size:14px}
.q26-m .q26-research-given,.q26-m .q26-research-options p,.q26-m .q26-research-test p,.q26-m .q26-research-revise{font-size:18px}
.q26-m .q26-research-options h2,.q26-m .q26-research-prompt,.q26-m .q26-research-takeaway{font-size:25px}

/* v14: a short verifiable behavior trace, not a new maths exercise. */
.q26-trace{display:flex;flex-direction:column;gap:14px;padding:8px 0}
.q26-trace p,.q26-trace h2{margin:0}
.q26-trace-origin{font-size:21px;color:var(--muted);line-height:1.4}
.q26-trace-task{font-size:27px;line-height:1.5}
.q26-trace-grid{display:grid;grid-template-columns:1fr 1fr;gap:22px}
.q26-trace-grid article{border:1px solid var(--line);border-radius:12px;padding:20px 24px;min-height:245px;background:var(--white)}
.q26-trace-grid article>span{font-size:22px;color:var(--muted)}
.q26-trace-grid h2{font-size:31px;font-weight:600;color:var(--navy);margin:8px 0 16px}
.q26-trace-grid p{font-size:27px;line-height:1.65}
.q26-trace-grid small{display:block;margin-top:13px;font-size:18px;color:var(--muted)}
.q26-trace-grid .q26-trace-return{border-color:#d9c6a2;background:#fbf6ea}
.q26-trace-predict strong{display:block;font-size:52px;font-weight:400;color:var(--muted);margin-top:12px}
.q26-trace-ask{font-size:30px;font-weight:600;line-height:1.4;color:var(--navy)}
.q26-trace-limit{font-size:22px;line-height:1.5;color:var(--muted)}
.q26-trace-cite{font-size:18px;line-height:1.4;color:var(--muted)}
.q26-trace-cite a{color:inherit}
.q26[data-q26-cue="t0"] .q26-foot,.q26[data-q26-cue="t1"] .q26-foot{display:none}
.q26-m .q26-trace{height:auto;gap:14px}.q26-m .q26-trace-grid{grid-template-columns:1fr;gap:12px}
.q26-m .q26-trace-task,.q26-m .q26-trace-grid p{font-size:19px}.q26-m .q26-trace-grid article{min-height:0;padding:16px}
.q26-m .q26-trace-grid h2{font-size:24px}.q26-m .q26-trace-ask{font-size:22px}
.q26-m .q26-trace-origin,.q26-m .q26-trace-limit,.q26-m .q26-trace-grid article>span{font-size:17px}.q26-m .q26-trace-cite,.q26-m .q26-trace-grid small{font-size:14px}