// Figurative dots and patterns in chapter prose
.counting-dots {
  display: inline-flex;
  flex-wrap: wrap;
  align-items: center;
  gap: 5px;
  vertical-align: middle;
}

.counting-dots__dot {
  display: block;
  width: 12px;
  height: 12px;
  border-radius: 50%;
  background: #0f766e;
  box-shadow: 0 1px 0 rgba(0, 0, 0, 0.12);
  flex-shrink: 0;
}

.counting-dots--empty .counting-dots__none {
  font-size: 0.85rem;
  font-style: italic;
  color: var(--muted);
}

.counting-dots--compare {
  max-width: 100px;
}

.counting-dots--pair {
  display: inline-flex;
  flex-wrap: wrap;
  gap: 8px;
  max-width: 200px;
}

.counting-dots__pair {
  display: inline-flex;
  gap: 4px;
  padding: 4px 6px;
  border-radius: 6px;
  background: rgba(20, 184, 166, 0.12);
  border: 1px dashed rgba(15, 118, 110, 0.35);
}

.counting-dots--odd {
  display: inline-flex;
  flex-wrap: wrap;
  align-items: center;
  gap: 8px;
  max-width: 220px;
}

.counting-dots__singleton {
  display: inline-flex;
  align-items: center;
  justify-content: center;
  padding: 4px 8px;
  border-radius: 6px;
  background: rgba(234, 88, 12, 0.14);
  border: 2px solid rgba(180, 83, 9, 0.45);
}

.counting-dots__singleton .counting-dots__dot {
  background: #c2410c;
}

.counting-pattern-ladder--odd .counting-pattern-step {
  background: rgba(234, 88, 12, 0.06);
}

.counting-number-table td:last-child {
  min-width: 110px;
}

.counting-compare {
  display: flex;
  flex-wrap: wrap;
  gap: 24px;
  justify-content: center;
  margin: 20px 0;
  padding: 16px;
  border: 1px solid var(--line);
  border-radius: 12px;
  background: var(--card-bg);
}

.counting-compare__group {
  display: flex;
  flex-direction: column;
  align-items: center;
  gap: 8px;
}

.counting-compare__digit {
  font-family: var(--mono);
  font-size: 1.25rem;
  font-weight: 700;
}

.counting-compare__word {
  font-size: 0.8rem;
  font-weight: 600;
  text-transform: uppercase;
  letter-spacing: 0.06em;
  color: var(--soft-ink);
}

.counting-pattern-board {
  margin: 20px 0;
  padding: 16px 18px;
  border: 1px solid var(--line);
  border-radius: 12px;
  background: var(--card-bg);
}

.counting-pattern-ladder {
  display: flex;
  flex-wrap: wrap;
  gap: 14px 18px;
  margin: 0;
  padding: 0;
  list-style: none;
}

.counting-pattern-step {
  display: flex;
  flex-direction: column;
  align-items: center;
  gap: 8px;
  min-width: 56px;
  padding: 10px 8px;
  border-radius: 8px;
  background: rgba(20, 184, 166, 0.06);
}

.counting-pattern-step__digit {
  font-family: var(--mono);
  font-size: 1.1rem;
  font-weight: 700;
  color: var(--ink);
}

.counting-pattern-board__caption {
  margin: 14px 0 0;
  font-size: 0.9rem;
  color: var(--soft-ink);
  text-align: center;
}

.counting-shape-pattern {
  margin: 20px 0;
  padding: 16px 18px;
  border: 1px solid var(--line);
  border-radius: 12px;
  background: var(--card-bg);
}

.counting-shape-pattern__strip {
  display: flex;
  flex-wrap: wrap;
  justify-content: center;
  gap: 12px 16px;
  margin: 0;
  padding: 0;
  list-style: none;
}

.counting-shape-pattern__strip > li {
  display: flex;
  flex-direction: column;
  align-items: center;
  gap: 6px;
}

.counting-shape {
  display: block;
  width: 36px;
  height: 36px;
}

.counting-shape--circle {
  border-radius: 50%;
  background: rgba(59, 130, 246, 0.45);
  border: 2px solid rgba(37, 99, 235, 0.5);
}

.counting-shape--square {
  border-radius: 4px;
  background: rgba(234, 179, 8, 0.45);
  border: 2px solid rgba(180, 83, 9, 0.45);
}

.counting-shape--question {
  display: flex;
  align-items: center;
  justify-content: center;
  border-radius: 8px;
  border: 2px dashed var(--line);
  font-family: var(--mono);
  font-size: 1.25rem;
  font-weight: 700;
  color: var(--muted);
  background: transparent;
}

.counting-shape-pattern__label {
  font-size: 0.72rem;
  color: var(--soft-ink);
  text-transform: lowercase;
}

.counting-shape-pattern__next .counting-shape-pattern__label {
  font-weight: 600;
  color: var(--accent);
}

.counting-demo__objects {
  display: flex;
  flex-wrap: wrap;
  gap: 10px;
  min-height: 88px;
  padding: 16px;
  border: 1px dashed var(--line);
  border-radius: 10px;
  background: var(--card-bg);
}

.counting-demo__object {
  width: 40px;
  height: 40px;
  border: none;
  border-radius: 50%;
  background: rgba(20, 184, 166, 0.35);
  cursor: pointer;
  transition: transform 0.12s ease, background 0.12s ease;
}

.counting-demo__object:hover {
  transform: scale(1.06);
  background: rgba(20, 184, 166, 0.55);
}

.counting-demo__object--active {
  background: rgba(15, 118, 110, 0.75);
}

.counting-demo__count {
  font-family: var(--mono);
  font-size: 2rem;
  font-weight: 700;
  color: var(--ink);
}

.addition-groups__piles {
  display: flex;
  flex-wrap: wrap;
  align-items: flex-end;
  justify-content: center;
  gap: 20px;
}

.addition-groups__pile {
  display: flex;
  flex-direction: column;
  align-items: center;
  gap: 8px;
}

.addition-groups__dots {
  display: flex;
  flex-wrap: wrap;
  gap: 6px;
  justify-content: center;
  width: 140px;
  min-height: 100px;
  padding: 10px;
  border-radius: 8px;
  background: rgba(59, 130, 246, 0.08);
}

.addition-groups__pile--b .addition-groups__dots {
  background: rgba(154, 107, 46, 0.12);
}

.addition-groups__dot {
  width: 14px;
  height: 14px;
  border-radius: 50%;
  background: var(--ink);
}

.addition-groups__plus,
.addition-groups__equals {
  font-family: var(--mono);
  font-size: 1.5rem;
  font-weight: 700;
  color: var(--soft-ink);
}

.addition-groups__total-dots {
  display: flex;
  flex-wrap: wrap;
  gap: 5px;
  justify-content: center;
  max-width: 320px;
  min-height: 48px;
  margin-top: 12px;
}

.multiplication-array__grid {
  display: grid;
  gap: 6px;
  width: fit-content;
  margin: 0 auto;
  padding: 12px;
  border-radius: 10px;
  background: var(--card-bg);
  border: 1px solid var(--line);
}

.multiplication-array__cell {
  width: 22px;
  height: 22px;
  border-radius: 50%;
  background: rgba(20, 184, 166, 0.45);
}

// Place value ladder (prose)
.counting-place-ladder {
  margin: 20px 0;
  padding: 16px 18px;
  border: 1px solid var(--line);
  border-radius: 12px;
  background: var(--card-bg);
}

.counting-place-ladder__steps {
  display: flex;
  flex-wrap: wrap;
  align-items: center;
  justify-content: center;
  gap: 12px 16px;
  margin: 0;
  padding: 0;
  list-style: none;
}

.counting-place-step {
  display: flex;
  flex-direction: column;
  align-items: center;
  gap: 8px;
}

.counting-place-step--arrow {
  font-family: var(--mono);
  font-size: 0.9rem;
  font-weight: 700;
  color: var(--soft-ink);
}

.counting-place-step__label {
  font-size: 0.8rem;
  font-weight: 600;
  color: var(--soft-ink);
}

.counting-place-blocks__rod {
  display: block;
  width: 14px;
  height: 72px;
  border-radius: 4px;
  background: linear-gradient(180deg, #14b8a6 0%, #0f766e 100%);
}

.counting-place-blocks__grid {
  display: block;
  width: 72px;
  height: 72px;
  border-radius: 6px;
  background:
    repeating-linear-gradient(
      90deg,
      rgba(15, 118, 110, 0.35) 0,
      rgba(15, 118, 110, 0.35) 6px,
      transparent 6px,
      transparent 12px
    ),
    repeating-linear-gradient(
      rgba(15, 118, 110, 0.35) 0,
      rgba(15, 118, 110, 0.35) 6px,
      transparent 6px,
      transparent 12px
    );
  border: 2px solid rgba(15, 118, 110, 0.5);
}

.counting-big-table td:first-child {
  font-weight: 600;
}

// Division sharing widget
.division-sharing__equation {
  margin: 12px 0;
  font-family: var(--mono);
  font-size: 1.05rem;
  text-align: center;
}

.division-sharing__piles {
  display: flex;
  flex-wrap: wrap;
  justify-content: center;
  gap: 14px;
}

.division-sharing__pile {
  display: flex;
  flex-direction: column;
  align-items: center;
  gap: 6px;
}

.division-sharing__pile-label {
  font-size: 0.75rem;
  font-weight: 600;
  text-transform: uppercase;
  letter-spacing: 0.05em;
  color: var(--soft-ink);
}

.division-sharing__dots {
  display: flex;
  flex-wrap: wrap;
  gap: 5px;
  justify-content: center;
  width: 88px;
  min-height: 72px;
  padding: 8px;
  border-radius: 8px;
  background: rgba(59, 130, 246, 0.08);
}

.division-sharing__dot {
  width: 12px;
  height: 12px;
  border-radius: 50%;
  background: var(--ink);
}

.division-sharing__dot--extra {
  background: #c2410c;
}

.division-sharing__dots--remainder {
  background: rgba(234, 88, 12, 0.1);
  border: 1px dashed rgba(180, 83, 9, 0.45);
}

.division-sharing__uneven {
  display: flex;
  flex-wrap: wrap;
  align-items: flex-end;
  justify-content: center;
  gap: 16px;
}

.division-sharing__remainder {
  display: flex;
  flex-direction: column;
  align-items: center;
  gap: 6px;
}

// Big numbers scale widget
.big-numbers-scale__picker {
  display: flex;
  flex-wrap: wrap;
  gap: 8px;
  justify-content: center;
}

.big-numbers-scale__btn {
  padding: 6px 12px;
  border: 1px solid var(--line);
  border-radius: 8px;
  font-family: var(--mono);
  font-size: 0.8rem;
  background: var(--card-bg);
  color: var(--ink);
  cursor: pointer;
}

.big-numbers-scale__btn--active {
  border-color: #0f766e;
  background: rgba(20, 184, 166, 0.15);
  font-weight: 700;
}

.big-numbers-scale__display {
  margin: 16px 0 8px;
  text-align: center;
}

.big-numbers-scale__number {
  font-family: var(--mono);
  font-size: 2rem;
  font-weight: 700;
}

.big-numbers-scale__compare {
  margin: 0 0 12px;
  font-size: 0.9rem;
  text-align: center;
  color: var(--soft-ink);
}

.big-numbers-scale__visual {
  display: flex;
  justify-content: center;
  min-height: 120px;
  margin: 12px 0;
  padding: 16px;
  border: 1px dashed var(--line);
  border-radius: 10px;
  background: var(--card-bg);
}

.big-numbers-scale__grid {
  display: grid;
  gap: 4px;
}

.big-numbers-scale__grid--small .big-numbers-scale__cell {
  width: 6px;
  height: 6px;
}

.big-numbers-scale__cell {
  width: 10px;
  height: 10px;
  border-radius: 50%;
  background: #0f766e;
}

.big-numbers-scale__blocks {
  display: flex;
  flex-wrap: wrap;
  gap: 6px;
  justify-content: center;
  max-width: 280px;
}

.big-numbers-scale__block {
  padding: 6px 8px;
  border-radius: 4px;
  font-family: var(--mono);
  font-size: 0.65rem;
  font-weight: 700;
  background: rgba(20, 184, 166, 0.2);
  border: 1px solid rgba(15, 118, 110, 0.35);
}

.big-numbers-scale__block--hundred {
  min-width: 36px;
  text-align: center;
}

.big-numbers-scale__visual-caption {
  flex: 1 1 100%;
  margin: 10px 0 0;
  font-size: 0.82rem;
  line-height: 1.45;
  text-align: center;
  color: var(--soft-ink);
}

.big-numbers-scale__visual-caption--inline {
  margin: 8px 0 0;
}

.big-numbers-scale__math-hint {
  font-family: var(--mono);
  font-size: 0.85em;
}

// 1 million: 100 × 10,000
.big-numbers-scale__million {
  width: 100%;
}

.big-numbers-scale__mega-grid {
  display: grid;
  grid-template-columns: repeat(10, 1fr);
  gap: 3px;
  max-width: 280px;
  margin: 0 auto;
}

.big-numbers-scale__mega-cell {
  display: flex;
  align-items: center;
  justify-content: center;
  min-height: 22px;
  border-radius: 3px;
  font-family: var(--mono);
  font-size: 0.5rem;
  font-weight: 700;
  color: #0f766e;
  background: rgba(20, 184, 166, 0.22);
  border: 1px solid rgba(15, 118, 110, 0.35);
}

// 1 billion: mini million × 1000 → grid of 1M
.big-numbers-scale__billion {
  width: 100%;
}

.big-numbers-scale__billion-compare {
  display: flex;
  flex-wrap: wrap;
  align-items: center;
  justify-content: center;
  gap: 10px 14px;
}

.big-numbers-scale__billion-unit {
  display: flex;
  flex-direction: column;
  align-items: center;
  gap: 6px;
  padding: 8px;
  border-radius: 8px;
  background: rgba(20, 184, 166, 0.06);
  border: 1px solid var(--line);
}

.big-numbers-scale__billion-unit--wide {
  flex: 1 1 200px;
  max-width: 320px;
  background: rgba(234, 88, 12, 0.06);
  border-color: rgba(180, 83, 9, 0.35);
}

.big-numbers-scale__billion-unit-label {
  font-size: 0.72rem;
  font-weight: 700;
  text-transform: uppercase;
  letter-spacing: 0.05em;
  color: var(--soft-ink);
}

.big-numbers-scale__mini-grid {
  display: grid;
  grid-template-columns: repeat(4, 1fr);
  gap: 2px;
}

.big-numbers-scale__mini-cell {
  display: flex;
  align-items: center;
  justify-content: center;
  width: 28px;
  height: 18px;
  border-radius: 2px;
  font-family: var(--mono);
  font-size: 0.45rem;
  font-weight: 700;
  color: #0f766e;
  background: rgba(20, 184, 166, 0.25);
}

.big-numbers-scale__billion-times {
  font-family: var(--mono);
  font-size: 1rem;
  font-weight: 700;
  color: var(--accent);
}

.big-numbers-scale__billion-equals {
  font-family: var(--mono);
  font-size: 1.25rem;
  font-weight: 700;
  color: var(--muted);
}

.big-numbers-scale__giga-grid {
  display: grid;
  grid-template-columns: repeat(10, 1fr);
  gap: 2px;
  width: 100%;
}

.big-numbers-scale__giga-cell {
  display: flex;
  align-items: center;
  justify-content: center;
  min-height: 18px;
  border-radius: 2px;
  font-family: var(--mono);
  font-size: 0.48rem;
  font-weight: 700;
  color: #9a3412;
  background: rgba(234, 88, 12, 0.28);
  border: 1px solid rgba(180, 83, 9, 0.4);
}