/* --- Jeux « triangles des formules » (puissance, vitesse, masse volumique, poids) --- */
.tri-grid {
  display: grid;
  grid-template-columns: repeat(2, minmax(0, 1fr));
  gap: 1rem;
}

.tri-grid.is-three { grid-template-columns: repeat(3, minmax(0, 1fr)); }

.tri-card {
  padding: 0.5rem;
  border: 2px solid transparent;
  border-radius: var(--school-radius-md);
  text-align: center;
}

/* Triangle dont le calculateur se sert (jeu vitesse, masse volumique et poids) */
.tri-card.is-active { border-color: var(--mm-teal); background: color-mix(in srgb, var(--mm-teal) 6%, transparent); }

.tri-title {
  font-size: 0.9rem;
  font-weight: 700;
}

.tri-formula {
  display: block;
  color: var(--mm-teal);
  white-space: nowrap;
}

.tri {
  position: relative;
  width: min(100%, 11rem);
  aspect-ratio: 120 / 104;
  margin: 0 auto;
}

.tri-svg {
  position: absolute;
  inset: 0;
  width: 100%;
  height: 100%;
}

.tri-shape {
  fill: var(--mm-teal-soft);
  stroke: var(--mm-teal);
  stroke-width: 3;
  stroke-linejoin: round;
}

.tri-line { stroke: var(--mm-teal); stroke-width: 2; }
.tri-sign { fill: var(--school-text-muted); font-size: 16px; font-weight: 700; }

/* Lettre du triangle : un bouton posé sur le dessin ; cachée, elle laisse place à un disque « ? » */
.tri-btn {
  position: absolute;
  display: flex;
  align-items: center;
  justify-content: center;
  width: 2.4rem;
  height: 2.4rem;
  padding: 0;
  border: 2px solid transparent;
  border-radius: 50%;
  background: transparent;
  color: var(--school-text);
  font-size: 1.4rem;
  font-weight: 800;
  line-height: 1;
  transform: translate(-50%, -50%);
  cursor: pointer;
  transition: background-color 0.15s ease, transform 0.15s ease;
}

.tri-btn:hover { border-color: var(--mm-teal); }

.tri-btn:focus-visible {
  outline: 3px solid var(--school-primary);
  outline-offset: 2px;
}

.tri-btn.is-hidden {
  background: var(--mm-teal);
  font-size: 0;
  transform: translate(-50%, -50%) scale(1.08);
}

.tri-btn.is-hidden::after {
  content: "?";
  color: var(--school-surface);
  font-size: 1.3rem;
}

.tri-reading {
  min-height: 3em;
  margin-top: 0.5rem;
}

/* Petit triangle du corrigé : la grandeur calculée est inscrite sur un disque ambre */
.tri-mini { flex-shrink: 0; }
.tri-letter { fill: var(--school-text); font-size: 26px; font-weight: 800; }
.tri-disk { fill: var(--school-xp); }
.tri-letter.is-hidden { fill: var(--school-surface); }

/* --- Tuiles des quatre grandeurs : données en sarcelle, calculées en ambre --- */
/* Colonnes réduites selon la largeur du bloc (colonne étroite de la méthode, mobile) */
.tri-tiles-box { container-type: inline-size; }

.tri-tiles {
  display: grid;
  grid-template-columns: repeat(var(--tri-cols, 4), minmax(0, 1fr));
  gap: 0.5rem;
  margin-bottom: 0.75rem;
}

.tri-tile {
  display: flex;
  flex-direction: column;
  align-items: center;
  gap: 0.1rem;
  padding: 0.5rem 0.25rem;
  border: 2px solid var(--school-border);
  border-radius: var(--school-radius-md);
  background: var(--school-surface);
  text-align: center;
}

.tri-tile-sym { font-size: 1.25rem; font-weight: 800; line-height: 1.1; }

.tri-tile-value {
  font-size: 1.05rem;
  font-weight: 700;
  font-variant-numeric: tabular-nums;
  white-space: nowrap;
}

.tri-tile-name { color: var(--school-text-muted); font-size: 0.75rem; line-height: 1.2; }

.tri-tile-tag {
  margin-top: 0.15rem;
  padding: 0.05rem 0.45rem;
  border-radius: 999px;
  font-size: 0.68rem;
  font-weight: 700;
  letter-spacing: 0.03em;
  text-transform: uppercase;
}

.tri-tile.is-given { border-color: var(--mm-teal); background: var(--mm-teal-soft); }
.tri-tile.is-given .tri-tile-sym { color: var(--mm-teal); }
.tri-tile.is-given .tri-tile-tag { background: color-mix(in srgb, var(--mm-teal) 20%, var(--school-surface)); }

.tri-tile.is-computed,
.tri-tile.is-mid,
.tri-tile.is-answer {
  border-color: var(--school-xp);
  background: color-mix(in srgb, var(--school-xp) 10%, var(--school-surface));
}

.tri-tile.is-mid { border-style: dashed; }

.tri-tile.is-computed .tri-tile-sym,
.tri-tile.is-mid .tri-tile-sym,
.tri-tile.is-answer .tri-tile-sym { color: var(--school-xp); }

.tri-tile.is-computed .tri-tile-tag,
.tri-tile.is-mid .tri-tile-tag,
.tri-tile.is-answer .tri-tile-tag { background: color-mix(in srgb, var(--school-xp) 22%, var(--school-surface)); }

.tri-tile.is-ask { border-style: dashed; border-color: var(--school-xp); }
.tri-tile.is-ask .tri-tile-value { color: var(--school-xp); font-size: 1.3rem; line-height: 1.1; }
.tri-tile.is-off { opacity: 0.45; }

/* --- Étapes du calcul et curseurs de l'atelier --- */
.tri-steps {
  display: flex;
  flex-direction: column;
  gap: 0.4rem;
}

.tri-step {
  display: flex;
  align-items: center;
  gap: 0.6rem;
  padding: 0.35rem 0.6rem;
  border-radius: var(--school-radius-md);
  background: color-mix(in srgb, var(--school-border) 18%, transparent);
  font-size: 0.95rem;
  font-variant-numeric: tabular-nums;
}

[data-bs-theme="dark"] .tri-step { background: color-mix(in srgb, var(--school-border) 40%, transparent); }

.tri-number-group { width: 9rem; flex-shrink: 0; }
.tri-number { font-variant-numeric: tabular-nums; text-align: right; }

@container (max-width: 28rem) {
  .tri-tiles { grid-template-columns: repeat(var(--tri-cols-sm, 2), minmax(0, 1fr)); }
}

@media (max-width: 575.98px) {
  .tri-grid.is-three { gap: 0.25rem; }
  .tri-grid.is-three .tri-card { padding: 0.25rem; }
  .tri-grid.is-three .tri-btn { width: 1.8rem; height: 1.8rem; }
  .tri-grid.is-three .tri-btn:not(.is-hidden) { font-size: 1.05rem; }
  .tri-grid.is-three .tri-btn.is-hidden::after { font-size: 1rem; }
}

@media (prefers-reduced-motion: reduce) {
  .tri-btn { transition: none; }
}