openfreebooks-bookgenerator/content/math/properties-of-operations/chapter.scss

// Wide interactive demos (match written-calculation breakout)
.book-prose .math-widget-mount:has(.prop-dist),
.book-prose .math-widget-mount:has(.prop-comm),
.book-prose .math-widget-mount:has(.prop-assoc) {
  max-width: none;
}

.prop-dist,
.prop-comm,
.prop-assoc {
  width: min(1100px, 92vw);
  max-width: none;
}

// --- Distributive area model ---
.prop-dist__header {
  display: flex;
  flex-wrap: wrap;
  align-items: flex-start;
  justify-content: space-between;
  gap: 12px 20px;
  margin-bottom: 0.5rem;
}

.prop-dist__title {
  margin: 0;
}

.prop-dist__toggle {
  font: inherit;
  font-size: 0.8125rem;
  font-weight: 600;
  letter-spacing: 0.04em;
  text-transform: uppercase;
  padding: 8px 14px;
  border: 1px solid var(--line);
  border-radius: 8px;
  background: var(--paper);
  color: var(--soft-ink);
  cursor: pointer;
}

.prop-dist__toggle:hover,
.prop-dist__toggle:focus-visible {
  border-color: var(--accent);
  color: var(--accent);
}

.prop-dist__formula {
  margin-bottom: 1.25rem;
  font-size: 1.05rem;
}

.prop-dist__formula .katex {
  font-size: 1.1em;
}

.prop-dist__var-a {
  color: #db2777;
}

.prop-dist__var-b {
  color: #2563eb;
}

.prop-dist__var-c {
  color: #16a34a;
}

.prop-dist__figure {
  margin: 0 0 1.5rem;
}

.prop-dist__model {
  display: grid;
  grid-template-columns: auto 1fr;
  gap: 8px 10px;
  max-width: 520px;
  margin: 0 auto;
  align-items: stretch;
}

.prop-dist__height {
  display: flex;
  align-items: center;
  grid-row: 1;
  grid-column: 1;
}

.prop-dist__dim {
  display: flex;
  align-items: center;
  justify-content: center;
  font-size: 0.95rem;
}

.prop-dist__dim--a {
  width: 2rem;
  padding-right: 8px;
  color: #db2777;
  border-right: 3px solid #db2777;
}

.prop-dist__rects {
  display: flex;
  grid-row: 1;
  grid-column: 2;
  min-height: 100px;
  border-left: 3px solid #db2777;
  border-right: 3px solid #db2777;
}

.prop-dist__rect {
  display: flex;
  align-items: center;
  justify-content: center;
  min-width: 3rem;
  padding: 12px 8px;
  font-size: 0.9rem;
}

.prop-dist__rect--b {
  border-top: 3px solid #2563eb;
  border-bottom: 3px solid #2563eb;
  background: color-mix(in srgb, #2563eb 10%, var(--card-bg));
}

.prop-dist__rect--c {
  border-top: 3px solid #16a34a;
  border-bottom: 3px solid #16a34a;
  background: color-mix(in srgb, #16a34a 10%, var(--card-bg));
}

.prop-dist__area .katex {
  font-size: 0.95em;
}

.prop-dist__widths {
  display: flex;
  gap: 0;
  grid-row: 2;
  grid-column: 2;
}

.prop-dist__dim--b,
.prop-dist__dim--c {
  text-align: center;
  padding-top: 6px;
  border-top: 2px solid currentColor;
}

.prop-dist__dim--b {
  color: #2563eb;
}

.prop-dist__dim--c {
  color: #16a34a;
}

.prop-dist__label-a {
  color: #db2777;
}

.prop-dist__label-b {
  color: #2563eb;
}

.prop-dist__label-c {
  color: #16a34a;
}

.prop-dist__slider-a {
  accent-color: #db2777;
}

.prop-dist__slider-b {
  accent-color: #2563eb;
}

.prop-dist__slider-c {
  accent-color: #16a34a;
}

.prop-dist__controls {
  display: grid;
  gap: 1rem;
}

@media (min-width: 640px) {
  .prop-dist__controls {
    grid-template-columns: repeat(3, 1fr);
  }
}

// --- Commutative ---
.prop-comm__mode,
.prop-assoc__mode {
  display: flex;
  flex-wrap: wrap;
  gap: 8px;
  margin-bottom: 1rem;
}

.prop-comm__mode-btn,
.prop-assoc__mode-btn {
  font: inherit;
  font-size: 0.875rem;
  font-weight: 600;
  padding: 8px 16px;
  border: 1px solid var(--line);
  border-radius: 8px;
  background: var(--paper);
  color: var(--soft-ink);
  cursor: pointer;
}

.prop-comm__mode-btn--active,
.prop-assoc__mode-btn--active {
  border-color: var(--accent);
  background: color-mix(in srgb, var(--accent) 12%, var(--paper));
  color: var(--ink);
}

.prop-comm__compare {
  margin: 0 0 1rem;
  font-size: 0.95rem;
  color: var(--soft-ink);
}

.prop-comm__compare .katex {
  font-size: 1em;
}

.prop-comm__stage {
  display: flex;
  justify-content: center;
  margin: 1rem 0;
  min-height: 100px;
}

.prop-comm__add-piles {
  display: flex;
  flex-wrap: wrap;
  align-items: center;
  justify-content: center;
  gap: 12px 16px;
}

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

.prop-comm__pile-label {
  font-family: var(--mono);
  font-size: 0.75rem;
  font-weight: 700;
  color: var(--muted);
}

.prop-comm__row {
  display: flex;
  flex-wrap: wrap;
  gap: 5px;
  justify-content: center;
  max-width: 120px;
}

.prop-comm__dot {
  width: 12px;
  height: 12px;
  border-radius: 50%;
  background: #0f766e;
}

.prop-comm__pile-dots--a .prop-comm__dot {
  background: #2563eb;
}

.prop-comm__pile-dots--b .prop-comm__dot {
  background: #c2410c;
}

.prop-comm__op {
  font-size: 1.5rem;
  font-weight: 700;
  color: var(--muted);
}

.prop-comm__merged {
  display: flex;
  flex-wrap: wrap;
  gap: 8px;
  justify-content: center;
  max-width: 200px;
}

.prop-comm__grid {
  display: grid;
  gap: 5px;
  padding: 12px;
  border-radius: 10px;
  border: 1px solid var(--line);
  background: color-mix(in srgb, var(--accent) 6%, var(--card-bg));
}

.prop-comm__grid-dot {
  width: 14px;
  height: 14px;
  border-radius: 4px;
  background: var(--accent);
}

.prop-comm__swap,
.prop-assoc__toggle {
  display: block;
  margin: 0 auto;
  font: inherit;
  font-size: 0.875rem;
  font-weight: 600;
  padding: 10px 18px;
  border: 1px solid var(--line);
  border-radius: 8px;
  background: var(--paper);
  color: var(--ink);
  cursor: pointer;
}

.prop-comm__swap:hover,
.prop-comm__swap:focus-visible,
.prop-assoc__toggle:hover,
.prop-assoc__toggle:focus-visible {
  border-color: var(--accent);
  color: var(--accent);
}

// --- Associative ---
.prop-assoc__formulas {
  margin-bottom: 1rem;
}

.prop-assoc__formulas .math-widget__formula {
  margin: 0 0 0.35rem;
}

.prop-assoc__alt {
  margin: 0;
  font-size: 0.9rem;
  color: var(--muted);
}

.prop-assoc__stage {
  display: flex;
  justify-content: center;
  margin: 1.25rem 0;
  overflow-x: auto;
}

.prop-assoc__group {
  display: flex;
  flex-wrap: wrap;
  align-items: center;
  justify-content: center;
  gap: 10px 12px;
  padding: 16px;
  border-radius: 12px;
  border: 1px dashed var(--line);
  background: color-mix(in srgb, var(--paper) 50%, var(--card-bg));
}

.prop-assoc__bracket {
  font-size: 2rem;
  font-weight: 700;
  line-height: 1;
  color: var(--accent);
}

.prop-assoc__op,
.prop-assoc__eq {
  font-size: 1.35rem;
  font-weight: 700;
  color: var(--muted);
}

.prop-assoc__block {
  display: flex;
  flex-wrap: wrap;
  gap: 4px;
  padding: 8px 10px;
  border-radius: 8px;
  max-width: 100px;
}

.prop-assoc__block--x {
  background: color-mix(in srgb, #2563eb 14%, transparent);
  border: 1px solid color-mix(in srgb, #2563eb 35%, transparent);
}

.prop-assoc__block--y {
  background: color-mix(in srgb, #c2410c 14%, transparent);
  border: 1px solid color-mix(in srgb, #c2410c 35%, transparent);
}

.prop-assoc__block--z {
  background: color-mix(in srgb, #16a34a 14%, transparent);
  border: 1px solid color-mix(in srgb, #16a34a 35%, transparent);
}

.prop-assoc__dot {
  width: 10px;
  height: 10px;
  border-radius: 50%;
  background: currentColor;
}

.prop-assoc__block--x .prop-assoc__dot {
  color: #2563eb;
  background: #2563eb;
}

.prop-assoc__block--y .prop-assoc__dot {
  background: #c2410c;
}

.prop-assoc__block--z .prop-assoc__dot {
  background: #16a34a;
}

.prop-assoc__result {
  display: flex;
  flex-wrap: wrap;
  gap: 4px;
  max-width: 140px;
  padding: 8px;
  border-radius: 8px;
  border: 1px solid var(--line);
}

.prop-assoc__dot--result {
  background: var(--accent);
}

.prop-assoc__many {
  font-size: 0.75rem;
  color: var(--muted);
  align-self: center;
}

.prop-example {
  margin: 1rem 0;
  padding: 14px 18px;
  border-left: 3px solid var(--accent);
  background: color-mix(in srgb, var(--accent) 8%, var(--card-bg));
  border-radius: 0 10px 10px 0;
  font-size: 0.95rem;
}

.prop-example__label {
  display: block;
  font-family: var(--mono);
  font-size: 0.68rem;
  font-weight: 700;
  letter-spacing: 0.1em;
  text-transform: uppercase;
  color: var(--accent);
  margin-bottom: 6px;
}