/* ============================================================
   図形推論 (Matrix) — styles lab.css doesn't have: the 3x3
   puzzle grid, SVG cell shapes, the soft 60s progress line, and the
   6-option answer grid. Built on the same brain.css tokens as
   lab.css. Load after lab.css.
   ============================================================ */

.matrix-progress-track {
  max-width: 340px;
  margin: 0 auto 16px;
  height: 3px;
  border-radius: 2px;
  background: var(--card-line);
  overflow: hidden;
}
.matrix-progress-bar {
  height: 100%;
  width: 100%;
  background: var(--accent, var(--color-terracotta));
}

.matrix-grid {
  display: grid;
  grid-template-columns: repeat(3, 1fr);
  gap: 8px;
  max-width: 340px;
  margin: 0 auto 22px;
}
.matrix-cell {
  aspect-ratio: 1 / 1;
  display: flex;
  align-items: center;
  justify-content: center;
  border: 1px solid var(--card-line);
  border-radius: var(--radius-card);
  background: var(--card);
}
.matrix-cell svg { width: 72%; height: 72%; }
.matrix-cell--hidden {
  border-style: dashed;
  border-color: var(--ink-faint, var(--text-muted));
  background: var(--color-ivory-warm);
}
.matrix-cell--hidden .qmark {
  font-family: var(--mono, var(--font-mono));
  font-size: 26px;
  color: var(--ink-faint, var(--text-muted));
}

.matrix-shape { fill: var(--ink, var(--color-ink)); }
.matrix-shape.is-outline { fill: none; stroke: var(--ink, var(--color-ink)); stroke-width: 3; }

.matrix-options {
  display: grid;
  grid-template-columns: repeat(2, 1fr);
  gap: 10px;
  max-width: 420px;
  margin: 0 auto;
}
@media (min-width: 520px) { .matrix-options { grid-template-columns: repeat(3, 1fr); } }
.matrix-option {
  display: flex;
  align-items: center;
  justify-content: center;
  min-height: 76px;
  border: 2px solid var(--line);
  border-radius: var(--radius-card);
  background: var(--card);
  cursor: pointer;
  padding: 8px;
  transition: border-color var(--dur) var(--ease), transform var(--dur) var(--ease);
}
.matrix-option svg { width: 46px; height: 46px; }
.matrix-option:hover, .matrix-option:focus-visible { border-color: var(--accent, var(--color-terracotta)); transform: translateY(-1px); }
.matrix-option[data-chosen="true"] { border-color: var(--accent-ink, var(--color-terracotta)); background: var(--accent-soft, var(--color-sage-soft)); }

.matrix-skip-row { text-align: center; margin-top: 16px; }
.matrix-skip-btn {
  font-family: var(--mono, var(--font-mono));
  font-size: 12px;
  color: var(--text-muted);
  background: none;
  border: none;
  text-decoration: underline;
  text-underline-offset: 2px;
  cursor: pointer;
  padding: 12px 8px;
  min-height: 44px;
}