/* --- Calcul mental : croix du produit en croix (pourcentages, proportionnalité) --- */
:root {
  --mm-teal: #0d9488;
  --mm-teal-soft: rgba(13, 148, 136, 0.1);
}

[data-bs-theme="dark"] {
  --mm-teal: #2dd4bf;
  --mm-teal-soft: rgba(45, 212, 191, 0.12);
}

.mm-cross {
  max-width: 340px;
  margin: 0 auto 1rem;
  animation: mm-cross-frame 0.3s ease both;
}

.mm-cross.is-solved { animation: none; }

.mm-cross-heads,
.mm-cross-grid {
  display: grid;
  grid-template-columns: 1fr 1fr;
}

.mm-cross-heads span {
  padding: 0 0.25rem 0.35rem;
  text-align: center;
  text-transform: uppercase;
  letter-spacing: 0.04em;
  font-size: 0.8rem;
  font-weight: 700;
  color: var(--school-text-muted);
}

.mm-cross-grid {
  position: relative;
  border: 2px solid var(--school-border);
  border-radius: var(--school-radius-md);
  background: var(--school-surface);
  overflow: hidden;
}

.mm-cross-cell {
  display: flex;
  align-items: center;
  justify-content: center;
  min-height: 4.25rem;
  padding: 0.5rem;
  font-size: 1.35rem;
  font-weight: 700;
  color: var(--school-text);
}

.mm-cross-cell:nth-of-type(odd) { border-right: 2px solid var(--school-border); }
.mm-cross-cell:nth-of-type(-n+2) { border-bottom: 2px solid var(--school-border); }

.mm-cross-value {
  position: relative;
  z-index: 1;
  display: inline-block;
  padding: 0.1rem 0.5rem;
  border-radius: var(--school-radius-pill);
  background: var(--school-surface);
  white-space: nowrap;
  animation: mm-cross-pop 0.35s ease both;
  animation-delay: calc(0.15s + var(--mm-order) * 0.18s);
}

.mm-cross-lines {
  position: absolute;
  inset: 0;
  width: 100%;
  height: 100%;
  pointer-events: none;
  animation: mm-cross-fade 0.4s ease 0.1s both;
}

.mm-cross-lines line {
  stroke: var(--school-text-muted);
  stroke-width: 1.5;
  stroke-dasharray: 4 4;
  vector-effect: non-scaling-stroke;
  opacity: 0.45;
}

.mm-cross-cell.is-unknown .mm-cross-value {
  color: var(--school-primary);
  border: 2px dashed var(--school-primary);
}

/* Croix corrigée : diagonale multipliée, diviseur, réponse */
.is-solved .mm-cross-value { animation: none; }

.mm-cross-cell.is-factor .mm-cross-value {
  color: var(--mm-teal);
  background: color-mix(in srgb, var(--mm-teal) 14%, var(--school-surface));
}

.mm-cross-cell.is-divisor .mm-cross-value {
  color: var(--school-xp);
  background: color-mix(in srgb, var(--school-xp) 14%, var(--school-surface));
}

.is-solved .mm-cross-cell.is-answer .mm-cross-value {
  color: var(--school-success-text);
  border: 2px solid var(--school-success);
  background: color-mix(in srgb, var(--school-success) 14%, var(--school-surface));
  animation: mm-cross-pop 0.35s ease both;
}

.is-solved .mm-cross-lines line { opacity: 0.2; }

.is-solved .mm-active-main .mm-line-main,
.is-solved .mm-active-anti .mm-line-anti {
  stroke: var(--mm-teal);
  stroke-width: 3;
  stroke-dasharray: none;
  opacity: 0.85;
}

.mm-cross-calc {
  margin: 0.6rem 0 0;
  text-align: center;
  font-size: 1.05rem;
  color: var(--school-text);
}

.mm-cross-calc .mm-factor { color: var(--mm-teal); font-weight: 700; }
.mm-cross-calc .mm-divisor { color: var(--school-xp); font-weight: 700; }

.mm-tip-box {
  padding: 0.75rem 1rem;
  border-radius: var(--school-radius-md);
  background: var(--mm-teal-soft);
  color: var(--school-text);
}

@keyframes mm-cross-frame {
  from { opacity: 0; transform: scale(0.96); }
  to { opacity: 1; transform: none; }
}

@keyframes mm-cross-pop {
  0% { opacity: 0; transform: scale(0.6); }
  70% { opacity: 1; transform: scale(1.08); }
  100% { opacity: 1; transform: none; }
}

@keyframes mm-cross-fade {
  from { opacity: 0; }
  to { opacity: 1; }
}

@media (prefers-reduced-motion: reduce) {
  .mm-cross,
  .mm-cross-value,
  .mm-cross-lines { animation: none !important; }
}