/* The fraction page's own drawings: the stacked fraction boxes, the operation picker, the answer in
   stacked notation, the equal-pieces bars and the working.

   Everything else — the panel, the hero card, the stat tiles, the FAQ accordion, the related cards,
   the pick panel — comes from styles.css and results.css. Scoped to .fraction-page, the body class
   this page opts into.

   The class names are this page's own; the shared sheets already own generic words (.shape, .cell,
   .bars, .comparison, .steps, .part), so anything specific here is checked against them in tests. */

/* ---------------------------------------------------------------- The form */

.fraction-page .lens {
  background: var(--accent);
  border-radius: 12px;
  padding: 14px;
  margin: 16px 0;
}
.fraction-page .lens .frac-check {
  display: flex;
  align-items: flex-start;
  gap: 9px;
  font-size: 0.9rem;
  font-weight: 600;
  line-height: 1.45;
  cursor: pointer;
}
.fraction-page .lens .frac-check input {
  flex: none;
  width: 18px;
  height: 18px;
  margin: 2px 0 0;
  accent-color: var(--highlight);
}
.fraction-page .lens .hint { margin: 8px 0 0; }

.fraction-page .operand {
  background: var(--accent);
  border-radius: 12px;
  padding: 12px 14px 14px;
}
.fraction-page .operand-head {
  display: flex;
  align-items: center;
  justify-content: space-between;
  gap: 10px;
  margin-bottom: 8px;
}
.fraction-page .operand-name { font-size: 0.8rem; font-weight: 700; color: var(--muted); }

.fraction-page .sign-btn {
  flex: none;
  width: 34px;
  height: 34px;
  border-radius: 50%;
  border: 1px solid var(--border);
  background: var(--card);
  color: var(--text);
  font: inherit;
  font-size: 1.05rem;
  font-weight: 800;
  line-height: 1;
  cursor: pointer;
}
.fraction-page .sign-btn:hover { border-color: var(--primary); }
.fraction-page .sign-btn[aria-pressed="true"] {
  background: var(--primary);
  border-color: var(--primary);
  color: var(--on-primary);
}
.fraction-page .sign-btn:focus-visible,
.fraction-page .operation:focus-visible {
  outline: 2px solid var(--highlight);
  outline-offset: 2px;
}

.fraction-page .fraction-inputs {
  display: flex;
  flex-wrap: wrap;
  align-items: flex-end;
  gap: 10px;
  min-width: 0;
}
.fraction-page .whole-slot {
  display: grid;
  gap: 4px;
  min-width: 0;
  flex: 0 1 74px;
}
.fraction-page .field-caption {
  font-size: 0.66rem;
  font-weight: 700;
  letter-spacing: 0.04em;
  text-transform: uppercase;
  color: var(--muted);
}
.fraction-page .part {
  display: grid;
  justify-items: center;
  gap: 3px;
  flex: 0 1 96px;
  min-width: 0;
}
.fraction-page .part input,
.fraction-page .whole-slot input {
  width: 100%;
  min-width: 0;
  min-height: 40px;
  padding: 6px 4px;
  text-align: center;
  font-size: 1.05rem;
  font-weight: 700;
  font-variant-numeric: tabular-nums;
}
.fraction-page .part input[aria-invalid="true"],
.fraction-page .whole-slot input[aria-invalid="true"] {
  border-color: var(--danger);
  background: var(--danger-bg);
}
.fraction-page .frac-line {
  display: block;
  width: 78%;
  height: 2px;
  border-radius: 1px;
  background: var(--primary);
}

.fraction-page .operations {
  display: grid;
  grid-template-columns: repeat(4, minmax(0, 1fr));
  gap: 8px;
  margin: 12px 0;
}
.fraction-page .operation {
  font: inherit;
  font-size: 1.2rem;
  font-weight: 700;
  min-height: 46px;
  padding: 0;
  border-radius: 10px;
  border: 1px solid var(--border);
  background: var(--card);
  color: var(--text);
  cursor: pointer;
}
.fraction-page .operation:hover { border-color: var(--primary); }
.fraction-page .operation[aria-pressed="true"] {
  background: var(--primary);
  border-color: var(--primary);
  color: var(--on-primary);
}

.fraction-page .form-actions {
  display: flex;
  flex-wrap: wrap;
  gap: 8px;
  margin: 4px 0 16px;
}
.fraction-page .form-actions .btn-secondary { margin: 0; }

.fraction-page .examples {
  border: 1px dashed var(--border);
  border-radius: 12px;
  padding: 10px 12px 12px;
  margin: 0 0 12px;
  min-width: 0;
}
.fraction-page .examples legend {
  font-size: 0.78rem;
  font-weight: 700;
  color: var(--muted);
  padding: 0 6px;
}
.fraction-page .example-row { display: flex; flex-wrap: wrap; gap: 8px; margin: 0; }
.fraction-page .example-row .chip { min-height: 36px; }
.fraction-page .limit-hint { margin: 0; }

/* ---------------------------------------------------------------- The answer, stacked */

.fraction-page .frac-hero .value {
  display: flex;
  align-items: center;
  min-width: 0;
  font-variant-numeric: tabular-nums;
}
.fraction-page .frac {
  display: inline-grid;
  justify-items: center;
  line-height: 1.05;
}
.fraction-page .frac-top,
.fraction-page .frac-bottom {
  font-size: inherit;
  font-weight: inherit;
  padding: 0 0.12em;
  overflow-wrap: anywhere;
}
.fraction-page .frac-bar {
  width: 100%;
  height: 0.14em;
  min-height: 3px;
  margin: 0.1em 0;
  border-radius: 2px;
  background: currentColor;
}
.fraction-page .frac-whole { font-size: inherit; }

.fraction-page .results-empty { font-size: 0.9rem; line-height: 1.55; color: var(--muted); margin: 0 0 12px; }
.fraction-page .calc-meaning:empty { display: none; }
.fraction-page .frac-tiles { gap: 10px; margin: 18px 0 0; }
.fraction-page .frac-tiles .value { font-size: 1.05rem; line-height: 1.3; overflow-wrap: anywhere; }
.fraction-page .frac-tiles .hint { font-size: 0.72rem; line-height: 1.4; margin: 4px 0 0; }
.fraction-page .frac-block { margin-top: 8px; }

/* ---------------------------------------------------------------- Equal pieces */

.fraction-page .bars {
  display: flex;
  flex-wrap: wrap;
  align-items: flex-start;
  gap: 6px;
  margin-top: 4px;
}
.fraction-page .bar-card {
  flex: 1 1 118px;
  min-width: 0;
  margin: 0;
  text-align: center;
}
.fraction-page .bar-label {
  display: block;
  font-size: 0.86rem;
  font-weight: 800;
  font-variant-numeric: tabular-nums;
  overflow-wrap: anywhere;
}
.fraction-page .bar-shapes {
  display: flex;
  flex-wrap: wrap;
  align-items: center;
  justify-content: center;
  gap: 4px;
  min-height: 44px;
  margin: 6px 0;
}
.fraction-page .shape {
  display: flex;
  width: 84px;
  height: 40px;
  border: 1px solid var(--border);
  border-radius: 6px;
  overflow: hidden;
  background: var(--card);
}
.fraction-page .shape .cell {
  flex: 1 1 0;
  min-width: 0;
  border-right: 1px solid var(--border);
}
.fraction-page .shape .cell:last-child { border-right: 0; }
.fraction-page .shape .cell.is-filled { background: var(--primary); }
.fraction-page .shape.is-whole { background: var(--primary); border-color: var(--primary); }
.fraction-page .shape.is-proportional { position: relative; }
.fraction-page .shape-fill {
  position: absolute;
  inset: 0 auto 0 0;
  background: var(--primary);
}
.fraction-page .bar-sign { font-size: 1rem; font-weight: 800; color: var(--muted); }
.fraction-page .bar-more { font-size: 0.7rem; color: var(--muted); align-self: center; }
.fraction-page .bar-op {
  align-self: center;
  padding: 0 2px;
  font-size: 1.15rem;
  font-weight: 800;
  color: var(--muted);
}
.fraction-page .bar-note {
  margin: 0;
  font-size: 0.72rem;
  line-height: 1.35;
  color: var(--muted);
}

/* ---------------------------------------------------------------- The working */

.fraction-page .steps {
  margin: 0 0 0 18px;
  padding: 0;
  display: grid;
  gap: 10px;
  font-size: 0.88rem;
  line-height: 1.55;
}
.fraction-page .steps li strong { display: block; }
.fraction-page .steps li span { color: var(--muted); overflow-wrap: anywhere; }
.fraction-page .steps-more { margin-top: 4px; }
.fraction-page .steps-more summary {
  cursor: pointer;
  font-size: 0.85rem;
  font-weight: 700;
  color: var(--primary);
  margin: 10px 0;
}
.fraction-page .steps-more[open] summary { margin-bottom: 10px; }

/* ---------------------------------------------------------------- Equivalents and the aside */

.fraction-page .equiv-row {
  display: flex;
  flex-wrap: wrap;
  align-items: center;
  gap: 4px 10px;
  margin: 0;
  font-size: 1.02rem;
  font-weight: 800;
  font-variant-numeric: tabular-nums;
  overflow-wrap: anywhere;
}
.fraction-page .eq-sign { font-weight: 400; color: var(--muted); }

.fraction-page .comparison {
  margin: 18px 0 0;
  padding: 12px 14px;
  border-radius: 12px;
  background: var(--accent);
  font-size: 0.88rem;
  line-height: 1.55;
}
.fraction-page .comparison:empty { display: none; }

/* ---------------------------------------------------------------- The facts */

.fraction-page .fact-list { display: grid; gap: 12px; }
.fraction-page .fact { background: var(--accent); border-radius: 12px; padding: 14px 16px; }
.fraction-page .fact h3 { font-size: 0.95rem; margin: 0 0 6px; }
.fraction-page .fact p { font-size: 0.88rem; line-height: 1.6; margin: 0; }
.fraction-page .mini-set { display: grid; gap: 6px; margin: 10px 0 0; }
.fraction-page .mini-bar {
  position: relative;
  display: block;
  height: 18px;
  border: 1px solid var(--border);
  border-radius: 4px;
  overflow: hidden;
  background: var(--card);
}
.fraction-page .mini-bar::after {
  content: "";
  position: absolute;
  inset: 0 auto 0 0;
  width: calc(100% * var(--filled) / var(--parts));
  background: var(--primary);
}
.fraction-page .mini-bar::before {
  content: "";
  position: absolute;
  inset: 0;
  z-index: 1;
  background-image: repeating-linear-gradient(90deg,
    transparent 0 calc(100% / var(--parts) - 1px),
    var(--card) calc(100% / var(--parts) - 1px) calc(100% / var(--parts)));
}
.fraction-page .mini-caption { font-size: 0.76rem; color: var(--muted); margin: 8px 0 0; }

.fraction-page .how-list { margin: 10px 0 0; padding-left: 20px; display: grid; gap: 8px; font-size: 0.9rem; line-height: 1.6; }
.fraction-page .how-list li { margin-bottom: 0; }
.fraction-page .formula-wrap { display: grid; gap: 8px; margin: 12px 0; }
.fraction-page .formula { margin: 0; white-space: normal; overflow-wrap: anywhere; }

/* ---------------------------------------------------------------- Narrow screens */

@media (max-width: 600px) {
  .fraction-page .part { flex: 1 1 84px; }
  .fraction-page .whole-slot { flex: 1 1 64px; }
  .fraction-page .bar-card { flex: 1 1 104px; }
  .fraction-page .frac-top,
  .fraction-page .frac-bottom { font-size: 2rem; }
}

@media (max-width: 420px) {
  .fraction-page .operand { padding: 10px 12px 12px; }
  .fraction-page .operations { gap: 6px; }
  .fraction-page .operation { font-size: 1.05rem; }
  .fraction-page .frac-tiles { grid-template-columns: minmax(0, 1fr); }
}

@media (prefers-reduced-motion: reduce) {
  .fraction-page * { transition: none !important; animation: none !important; }
}