.logic-detail {
  margin-top: 12px;
  border: 1px solid var(--line);
  border-radius: 14px;
  min-height: 44px;
  padding: 12px;
  background: var(--surface);
}

.logic-detail strong {
  display: block;
  margin-bottom: 8px;
  color: var(--ink);
}

.logic-detail ol {
  margin: 0;
  padding-left: 22px;
  display: grid;
  gap: 8px;
}

.logic-detail li {
  color: var(--muted);
  line-height: 1.45;
}

.logic-placement {
  display: inline-block;
  margin-right: 6px;
  color: var(--ink);
  font-weight: 700;
}

.technique-line {
  margin: 0 0 7px;
  color: var(--accent-strong);
  font-size: 0.84rem;
  font-weight: 700;
}

.contradiction-detail {
  margin: 12px 0;
  border: 1px solid #fecaca;
  border-radius: 14px;
  min-height: 44px;
  padding: 12px;
  background: #fff7f7;
  color: var(--bad-ink);
}

.contradiction-detail strong {
  display: block;
  margin-bottom: 6px;
  color: var(--bad-ink);
}

.contradiction-detail p {
  margin: 0 0 8px;
}

.contradiction-detail ul {
  margin: 0;
  padding-left: 18px;
}

.guess-help {
  margin-top: 14px;
  display: grid;
  gap: 14px;
}

.guess-candidates,
.guess-combinations {
  border-top: 1px solid var(--line);
  padding-top: 12px;
}

.guess-candidates strong,
.guess-combinations strong {
  display: block;
  margin-bottom: 8px;
  color: var(--ink);
}

.guess-candidates ul {
  margin: 0;
  padding-left: 18px;
}

.combo-grid {
  display: grid;
  grid-template-columns: repeat(auto-fill, minmax(96px, 1fr));
  gap: 10px;
  max-height: 360px;
  overflow: auto;
  padding: 2px 2px 6px;
}

.combo-option {
  display: block;
  width: 100%;
  border: 1px solid var(--line);
  border-radius: 12px;
  padding: 8px;
  background: var(--surface);
  color: var(--ink);
  text-align: left;
  cursor: pointer;
}

.combo-option:hover {
  border-color: var(--accent);
  transform: translateY(-1px);
}

.combo-option.is-success {
  border-color: var(--line);
  background: var(--surface);
}

.combo-option.is-success:hover {
  border-color: var(--accent);
  transform: translateY(-1px);
}

.combo-option.is-active-choice {
  border-color: var(--guess-ink);
  background: var(--guess);
  color: var(--guess-ink);
  box-shadow: none;
}

.combo-option.is-active-choice:hover {
  transform: none;
}

.combo-option.is-reviewed,
.combo-option.is-reviewed:hover,
.combo-option:disabled {
  background: var(--surface-soft);
  border-color: var(--line);
  color: var(--muted);
  cursor: not-allowed;
  opacity: 0.72;
  transform: none;
}

.combo-option.is-reviewed .mini-cube,
.combo-option:disabled .mini-cube {
  opacity: 0.72;
}

.combo-option > strong {
  display: block;
  font-size: 0.78rem;
  margin-bottom: 6px;
}

.mini-cell.is-combo,
.mini-cube-cell.is-combo {
  background: var(--guess);
  color: var(--guess-ink);
}

.walkthrough-header {
  display: grid;
  grid-template-columns: minmax(0, 1fr) auto;
  gap: 12px;
  align-items: start;
}

.walkthrough-header p:last-child {
  margin: 8px 0 0;
  color: var(--muted);
  line-height: 1.5;
}

.walkthrough-timer {
  align-self: start;
  justify-self: end;
  min-width: 74px;
  padding: 7px 10px;
  border: 1px solid var(--line);
  border-radius: 999px;
  background: var(--surface);
  color: var(--ink);
  font-variant-numeric: tabular-nums;
  font-weight: 700;
  text-align: center;
  letter-spacing: 0.02em;
}

.walkthrough-timer.is-paused {
  color: var(--muted);
  background: var(--surface-soft);
}

.walkthrough-timer.is-step-time {
  border-color: var(--accent);
}

.walkthrough-controls {
  grid-column: 1 / -1;
  display: flex;
  flex-wrap: wrap;
  gap: 8px;
}

.walkthrough-controls .button {
  flex: 1 1 auto;
}

.step-detail {
  min-height: 0;
  margin-top: 12px;
  border: 0;
  border-radius: 0;
  padding: 0;
  background: transparent;
}

.step-detail.is-state-only {
  margin-top: 10px;
}

.step-detail.is-state-only .step-heading {
  margin-bottom: 0;
}

.step-detail p {
  margin: 10px 0 0;
  line-height: 1.55;
}

.step-detail ul {
  margin: 10px 0 0;
  padding-left: 18px;
  color: var(--muted);
}


.manual-rewind-action {
  margin-top: 12px;
  border: 1px solid var(--remove-border);
  border-radius: 16px;
  padding: 12px;
  background: var(--remove);
}

.manual-rewind-action p {
  margin: 0 0 10px;
  color: var(--remove-ink);
}

.manual-rewind-action .button {
  width: 100%;
}

.timeline {
  display: flex;
  flex-wrap: nowrap;
  gap: 8px;
  max-height: none;
  overflow-x: auto;
  overflow-y: hidden;
  scroll-snap-type: x proximity;
  overscroll-behavior-inline: contain;
  padding: 16px 2px 8px;
  -webkit-overflow-scrolling: touch;
}

.timeline button {
  flex: 0 0 auto;
  min-width: 50px;
  border: 1px solid var(--line);
  border-radius: 999px;
  padding: 8px 10px;
  background: var(--surface);
  color: var(--muted);
  font-weight: 700;
  scroll-snap-align: center;
}

.timeline button.is-current {
  background: var(--accent);
  border-color: var(--accent);
  color: #fff;
}

.timeline button.is-guess {
  background: var(--guess);
  color: var(--guess-ink);
}

.timeline button.is-rewind,
.timeline button.is-branch_failed,
.timeline button.is-manual_clear {
  background: var(--remove);
  border-color: var(--remove-border);
  color: var(--remove-ink);
}

.timeline button.is-logical_fill,
.timeline button.is-branch_restore,
.timeline button.is-manual_entry {
  background: var(--good);
  color: var(--good-ink);
}

.timeline button.is-manual_start,
.timeline button.is-solved {
  /* Manual replay start and final solved states intentionally use the same neutral/current styling as solver initial-state steps. */
}

.timeline button.is-nudge {
  background: var(--guess);
  color: var(--guess-ink);
}

/* Milestone 23H: align human technique detail cards with the subtle purple board focus treatment. */
.human-technique-detail {
  border-color: var(--technique-focus-border) !important;
  background: linear-gradient(135deg, rgba(245, 243, 255, 0.98), rgba(255, 255, 255, 0.96)) !important;
  box-shadow: inset 4px 0 0 rgba(124, 58, 237, 0.8);
}

.human-technique-detail strong,
.human-technique-detail .technique-line {
  color: var(--technique-focus-ink);
}

.coloring-legend {
  display: flex;
  flex-wrap: wrap;
  gap: 8px;
  margin: 10px 0;
  color: var(--muted);
  font-size: 0.88rem;
  font-weight: 700;
}

.coloring-legend span {
  display: inline-flex;
  align-items: center;
  gap: 6px;
}

.coloring-swatch {
  width: 1.2em;
  height: 1.2em;
  border-radius: 999px;
  border: 1px solid var(--line);
}

.coloring-swatch.is-blue {
  background: var(--coloring-blue-bg);
  border-color: var(--coloring-blue-border);
}

.coloring-swatch.is-green {
  background: var(--coloring-green-bg);
  border-color: var(--coloring-green-border);
}


.simple-coloring-strong-link {
  margin: 0.85rem 0 0;
  padding: 0.8rem 0.9rem;
  border: 1px solid rgba(37, 99, 235, 0.22);
  border-radius: 1rem;
  background: rgba(239, 246, 255, 0.9);
  color: var(--ink);
}

.simple-coloring-strong-link strong {
  color: #1d4ed8;
}

.simple-coloring-conflict {
  margin: 0.85rem 0 0;
  padding: 0.8rem 0.9rem;
  border: 1px solid var(--coloring-green-border);
  border-radius: 1rem;
  background: #f0fdf4;
  color: var(--ink);
}

.simple-coloring-conflict strong {
  color: var(--coloring-green-ink);
}

.coloring-swatch.is-red {
  background: #fee2e2;
  border-color: #fca5a5;
}

.technique-animation {
  margin-top: 14px;
  border-top: 1px solid rgba(124, 58, 237, 0.18);
  padding-top: 12px;
}

.technique-animation summary {
  display: inline-flex;
  align-items: center;
  min-height: 34px;
  padding: 7px 12px;
  border: 1px solid var(--technique-focus-border);
  border-radius: 999px;
  background: var(--technique-focus);
  color: var(--technique-focus-ink);
  font-size: 0.84rem;
  font-weight: 800;
  cursor: pointer;
  user-select: none;
}

.technique-animation summary::-webkit-details-marker {
  display: none;
}

.technique-animation summary::before {
  content: '▶';
  margin-right: 7px;
  font-size: 0.7rem;
  transform: translateY(-1px);
}

.technique-animation[open] summary::before {
  content: '▾';
}

.technique-animation-body {
  margin-top: 12px;
  display: grid;
  gap: 10px;
}

.technique-animation-intro {
  margin: 0;
  color: var(--muted);
  font-size: 0.9rem;
}

.technique-animation-actions {
  display: flex;
  flex-wrap: wrap;
  align-items: center;
  gap: 8px;
}

.technique-animation-play,
.technique-animation-step,
.technique-animation-reset {
  min-height: 34px;
  padding: 7px 12px;
  font-size: 0.82rem;
}

.technique-animation-step {
  min-width: 38px;
  font-weight: 900;
}

.technique-animation-play[aria-pressed="true"] {
  box-shadow: inset 0 0 0 2px var(--technique-focus-border);
}

.technique-animation-status {
  color: var(--muted);
  font-size: 0.84rem;
  font-weight: 700;
}

.technique-animation-frames {
  list-style: none;
  margin: 0;
  padding: 0;
  display: grid;
  gap: 9px;
}

.technique-animation-frame {
  display: grid;
  grid-template-columns: auto minmax(0, 1fr);
  gap: 10px;
  align-items: start;
  border: 1px solid var(--line);
  border-radius: 14px;
  padding: 10px;
  background: var(--surface);
  transition: border-color 0.18s ease, background 0.18s ease, box-shadow 0.18s ease, transform 0.18s ease;
}

.technique-animation-frame.is-elimination {
  border-color: #fecaca;
  background: #fff7f7;
}

.technique-animation-frame.is-variant,
.technique-animation-frame.is-lines {
  border-color: rgba(124, 58, 237, 0.22);
  background: rgba(245, 243, 255, 0.58);
}

.technique-animation-frame.is-active {
  border-color: var(--technique-focus-border);
  background: var(--technique-focus);
  box-shadow: 0 10px 24px rgba(124, 58, 237, 0.17);
  transform: translateY(-1px);
}

.technique-animation-frame.is-active.is-elimination {
  border-color: var(--bad-ink);
  background: #fff7f7;
  box-shadow: 0 10px 24px rgba(220, 38, 38, 0.14);
}

.technique-animation-frame strong {
  display: block;
  margin: 0 0 3px;
  color: var(--ink);
}

.technique-animation-frame p {
  margin: 0;
  color: var(--muted);
  line-height: 1.45;
}

.technique-animation-marker {
  width: 28px;
  height: 28px;
  border-radius: 999px;
  display: inline-flex;
  align-items: center;
  justify-content: center;
  background: var(--technique-focus-border);
  color: white;
  font-weight: 800;
  font-size: 0.82rem;
  box-shadow: 0 0 0 3px rgba(124, 58, 237, 0.13);
}

.technique-animation-frame.is-elimination .technique-animation-marker {
  background: var(--bad-ink);
  box-shadow: 0 0 0 3px rgba(220, 38, 38, 0.12);
}

.technique-animation-frame.is-active .technique-animation-marker {
  box-shadow: 0 0 0 4px rgba(124, 58, 237, 0.22);
}

.technique-animation-frame.is-active.is-elimination .technique-animation-marker {
  box-shadow: 0 0 0 4px rgba(220, 38, 38, 0.2);
}

@media (prefers-reduced-motion: reduce) {
  .technique-animation-frame {
    transition: none;
  }
}

.technique-animation.technique-animation-cta {
  display: grid;
  gap: 0.35rem;
  margin-top: 0.7rem;
  padding: 0.75rem;
  border: 1px solid rgba(79, 70, 229, 0.22);
  border-radius: 16px;
  background: linear-gradient(135deg, rgba(238, 242, 255, 0.95), rgba(250, 245, 255, 0.9));
  color: var(--color-text, #1f2937);
}

.technique-animation-cta span {
  color: var(--color-muted, #64748b);
  font-size: 0.9rem;
  line-height: 1.35;
}

.technique-animation-cta .button {
  justify-self: start;
  padding: 0.38rem 0.75rem;
  min-height: 0;
}

.set-technique-detail {
  display: grid;
  gap: 10px;
  margin-top: 12px;
}

.set-technique-intro {
  margin: 0 !important;
  color: var(--ink);
  font-weight: 650;
}

.set-technique-card {
  border: 1px solid rgba(124, 58, 237, 0.18);
  border-radius: 14px;
  background: rgba(255, 255, 255, 0.72);
  padding: 10px 12px;
}

.set-technique-card > strong {
  display: block;
  margin-bottom: 8px;
  color: var(--technique-focus-ink);
  font-size: 0.82rem;
  letter-spacing: 0.06em;
  text-transform: uppercase;
}

.set-technique-card ul {
  display: grid;
  gap: 7px;
  margin: 0;
  padding: 0;
  list-style: none;
}

.set-technique-card li {
  display: grid;
  grid-template-columns: minmax(58px, auto) minmax(0, 1fr);
  gap: 10px;
  align-items: baseline;
  color: var(--muted);
}

.set-technique-card li strong {
  color: var(--ink);
  font-variant-numeric: tabular-nums;
}

.set-technique-card li span {
  min-width: 0;
}

.pattern-technique-detail {
  display: grid;
  gap: 10px;
  margin-top: 12px;
}

.pattern-technique-intro {
  margin: 0 !important;
  color: var(--ink);
  font-weight: 650;
}

.pattern-technique-card {
  border: 1px solid rgba(124, 58, 237, 0.18);
  border-radius: 14px;
  background: rgba(255, 255, 255, 0.72);
  padding: 10px 12px;
}

.pattern-technique-card > strong {
  display: block;
  margin-bottom: 8px;
  color: var(--technique-focus-ink);
  font-size: 0.82rem;
  letter-spacing: 0.06em;
  text-transform: uppercase;
}

.pattern-technique-card ul {
  display: grid;
  gap: 7px;
  margin: 0;
  padding: 0;
  list-style: none;
}

.pattern-technique-card li {
  display: grid;
  grid-template-columns: minmax(118px, auto) minmax(0, 1fr);
  gap: 10px;
  align-items: baseline;
  color: var(--muted);
}

.pattern-technique-card li strong {
  color: var(--ink);
  font-variant-numeric: tabular-nums;
}

.pattern-technique-card li span {
  min-width: 0;
}

@media (max-width: 700px) {
  .pattern-technique-card li {
    grid-template-columns: 1fr;
    gap: 2px;
  }
}

.is-chain-detail .pattern-technique-card.is-chain-contradiction {
  border-color: rgba(239, 68, 68, 0.28);
  background: rgba(254, 242, 242, 0.78);
}

.is-chain-detail .pattern-technique-card.is-chain-contradiction > strong {
  color: var(--bad-ink);
}

.is-chain-detail .pattern-technique-card.is-chain-conclusion {
  border-color: rgba(34, 197, 94, 0.26);
  background: rgba(240, 253, 244, 0.72);
}

.is-chain-detail .pattern-technique-card.is-chain-conclusion > strong {
  color: #047857;
}

/* Milestone 23J: replay regular Nudge stages in the current coaching-card style. */
.nudge-replay-detail {
  border-color: rgba(124, 58, 237, 0.34) !important;
  background: linear-gradient(135deg, rgba(245, 243, 255, 0.98), rgba(255, 255, 255, 0.96)) !important;
  box-shadow: inset 4px 0 0 rgba(124, 58, 237, 0.72);
}

.nudge-replay-heading {
  display: flex;
  align-items: flex-start;
  justify-content: space-between;
  gap: 10px;
}

.nudge-replay-heading strong,
.nudge-replay-lead strong {
  color: #4c1d95;
}

.nudge-replay-pill {
  flex: 0 0 auto;
  border-radius: 999px;
  background: rgba(124, 58, 237, 0.12);
  color: #4c1d95;
  font-size: 0.82rem;
  font-weight: 700;
  padding: 5px 8px;
  white-space: nowrap;
}