.calc-grid {
  display: grid;
  grid-template-columns: 1fr 1fr;
  gap: 20px 28px;
  align-items: end;
}

.num-input {
  width: 100%;
  min-height: 64px;
  font: 600 32px/1.1 var(--mono);
  font-variant-numeric: tabular-nums;
  padding: 10px 12px;
  border: 0;
  border-bottom: 2px solid var(--panel);
  background: var(--paper);
  color: var(--ink);
}

.question {
  font-family: var(--serif);
  font-size: clamp(18px, 2.4vw, 26px);
  margin: 0 0 18px;
}

.result-panel {
  background: var(--panel);
  color: #F3F1E9;
  padding: 22px 20px 26px;
  margin-top: 20px;
}
.result-panel .kicker { color: #c5cecb; }
.result-figure {
  font-family: var(--mono);
  font-variant-numeric: tabular-nums;
  font-size: clamp(52px, 9vw, 104px);
  line-height: 1;
  margin: 8px 0 16px;
}
.result-meta {
  display: grid;
  grid-template-columns: 1fr 1fr;
  gap: 10px 20px;
  font-size: 14px;
}
.result-meta .lbl { color: #c5cecb; margin: 0 0 4px; }

.step-strip {
  display: grid;
  grid-template-columns: 1fr 1fr 1fr;
  gap: 16px;
  background: var(--mark);
  padding: 18px 16px;
}
.step-strip article { border-left: 2px solid var(--accent); padding-left: 12px; }
.step-strip .mono { font-size: 15px; }

.folio-index {
  display: flex;
  gap: 0;
  overflow-x: auto;
  border-top: 1px solid var(--line);
  border-bottom: 1px solid var(--line);
}
.folio-index a,
.folio-index button {
  flex: 1 0 140px;
  text-align: left;
  background: transparent;
  border: 0;
  border-right: 1px solid var(--line);
  padding: 14px 12px;
  color: inherit;
  cursor: pointer;
  text-decoration: none;
  font: inherit;
}
.folio-index .kicker { margin: 0 0 4px; }
.folio-index h3 { font-size: 16px; margin: 0 0 6px; }
.folio-index p { margin: 0; font-size: 13px; color: var(--mute); }
.folio-index a.is-active,
.folio-index button.is-active { background: var(--paper); box-shadow: inset 0 -3px 0 var(--accent); }

.ratio-bench,
.compare-row {
  display: grid;
  grid-template-columns: 1fr 1fr;
  gap: 20px;
}

.ledger {
  background: var(--paper);
  border: 1px solid var(--line);
  border-left: 4px solid var(--sage);
  padding: 16px 18px;
}
.ledger p { display: flex; justify-content: space-between; gap: 12px; margin: 0; padding: 8px 0; border-bottom: 1px dashed var(--line); font-family: var(--mono); }
.ledger p:last-child { border-bottom: 0; font-weight: 700; }

.kind[data-kind="INCREASE"] { color: var(--sage); }
.kind[data-kind="DECREASE"] { color: var(--accent); }
.kind[data-kind="NO CHANGE"] { color: var(--mute); }

.viz-grid {
  display: grid;
  grid-template-columns: repeat(10, 1fr);
  gap: 4px;
  max-width: 420px;
  background: var(--paper);
  padding: 12px;
  border: 1px solid var(--line);
}
.viz-cell {
  aspect-ratio: 1;
  background: #ece7db;
  position: relative;
  overflow: hidden;
}
.viz-cell.is-full { background: var(--sage); }
.viz-cell.is-partial::after {
  content: "";
  position: absolute;
  inset: 0;
  width: var(--partial, 50%);
  background: var(--sage);
}
.viz-bar {
  height: 14px;
  background: #ece7db;
  margin: 12px 0;
}
.viz-bar span {
  display: block;
  height: 100%;
  width: 0;
  background: var(--panel);
}

.example-row {
  display: grid;
  grid-template-columns: 48px 1fr auto;
  gap: 6px 16px;
  padding: 14px 0;
  border-top: 1px solid var(--line);
}
.example-row h3, .example-row p { grid-column: 2; margin: 0; }
.example-row .btn { grid-column: 3; grid-row: 1 / span 4; align-self: center; }

.ref-col { padding: 16px 0; border-top: 1px solid var(--line); }
.mistake {
  display: grid;
  grid-template-columns: 1fr 1fr;
  gap: 16px;
  padding: 16px 0;
  border-top: 1px solid var(--line);
}
.mistake .wrong { text-decoration: line-through; color: var(--mute); }

select, input[type="text"], input[type="number"] {
  max-width: 100%;
  min-height: 42px;
  font: 16px/1.3 var(--mono);
  padding: 8px 10px;
  border: 1px solid var(--line);
  background: var(--paper);
  color: var(--ink);
}

@media (max-width: 760px) {
  .calc-grid, .step-strip, .ratio-bench, .compare-row, .result-meta, .mistake, .example-row {
    grid-template-columns: 1fr;
  }
  .example-row h3, .example-row p, .example-row .btn { grid-column: 1; grid-row: auto; }
  .num-input { font-size: 26px; min-height: 54px; }
}