/* Show Your Working — page-specific styles */

.entry-row {
  display: flex;
  flex-wrap: wrap;
  justify-content: center;
  align-items: center;
  gap: 0.5rem;
  margin-bottom: 0.8rem;
}

.num {
  width: 6.5rem;
  padding: 0.55rem 0.7rem;
  border: 2px solid #e8e2d8;
  border-radius: var(--radius-sm);
  background: var(--color-bg-alt);
  font-family: var(--font-display);
  font-weight: 700;
  font-size: 1.2rem;
  text-align: center;
  color: var(--color-text);
}

.num:focus-visible { outline: none; border-color: var(--color-orange); }

.chips { display: flex; flex-wrap: wrap; justify-content: center; gap: 0.35rem; }

.chip {
  padding: 0.35rem 0.7rem;
  border-radius: 999px;
  border: 2px solid #e8e2d8;
  background: var(--color-bg);
  font-family: var(--font-display);
  font-weight: 600;
  font-size: 0.8rem;
  color: var(--color-text-muted);
  cursor: pointer;
}

.chip:hover, .chip:focus-visible { border-color: var(--color-orange); outline: none; }
.chip.is-on { background: var(--color-orange); border-color: var(--color-orange); color: #fff; }

/* The sum itself, in a squared-paper grid so the columns line up exactly. */
.sum {
  margin: 1.1rem auto 0.6rem;
  width: max-content;
  max-width: 100%;
  overflow-x: auto;
  padding: 0.6rem 0.4rem;
  border-radius: var(--radius-md);
  background: #fffdf7;
  box-shadow: inset 0 0 0 2px #efe6d3;
}

.sum-row {
  display: grid;
  grid-template-columns: 1.6rem repeat(var(--cols), minmax(1.5rem, 1.9rem));
  align-items: center;
}

.sum-sign {
  font-family: var(--font-display);
  font-weight: 700;
  font-size: 1.05rem;
  color: var(--color-text-muted);
  text-align: right;
  padding-right: 0.3rem;
  white-space: nowrap;
}

.sum-cell {
  font-family: var(--font-display);
  font-weight: 700;
  font-size: clamp(1.1rem, 5vw, 1.5rem);
  text-align: center;
  line-height: 1.5;
  color: var(--color-text);
  border-radius: 4px;
}

/* The column being worked on right now. */
.sum-cell.is-here { background: #fff2d6; box-shadow: inset 0 0 0 2px var(--color-sun); }

/* Little numbers: carries above, and what has been carried in a division. */
.sum-row--carry .sum-cell, .sum-cell.is-carried, .sum-cell.is-carry {
  font-size: 0.8rem;
  color: var(--color-coral);
  line-height: 1.2;
}

.sum-row--carry { margin-bottom: -0.15rem; }

/* A digit that has been crossed out and changed while borrowing. */
.sum-cell.is-changed { color: var(--color-coral); }

.sum-row--result .sum-cell { color: var(--color-orange); }
.sum-row--partial .sum-cell { color: var(--color-text-muted); }

.sum-rule {
  grid-column: 2 / -1;
  height: 3px;
  background: var(--color-text);
  border-radius: 2px;
  margin: 0.15rem 0;
}

/* Division is written the other way up: answer on top, under a bus stop. */
.sum--bus .sum-row--busline .sum-rule { margin-bottom: 0.05rem; }
.sum--bus .sum-row--quotient .sum-cell { color: var(--color-orange); }
.sum--bus .sum-row--dividend .sum-cell { letter-spacing: -0.02em; }

.note {
  text-align: center;
  font-family: var(--font-display);
  font-weight: 600;
  font-size: clamp(0.95rem, 4vw, 1.15rem);
  color: var(--color-text);
  min-height: 3em;
  max-width: 42ch;
  margin: 0 auto;
}

@media (max-width: 420px) {
  .sum-row { grid-template-columns: 1.3rem repeat(var(--cols), minmax(1.2rem, 1.5rem)); }
}