/* =========================
   MAIN PAGE – TREE VIEW UI
   ========================= */

/* ---------- LAYOUT BASE ---------- */

.content {
  padding: 20px;
  display: flex;
  flex-direction: column;
  gap: 28px;
}

/* ---------- SEZIONI (TREE NODES) ---------- */

.content section {
  background: #ffffff;
  border-radius: 18px;
  padding: 20px;
  box-shadow: 0 4px 12px rgba(0,0,0,0.04);
}

/* progressione visiva (indentazione) */
#subjects-section {
  margin-left: 16px;
  border-left: 3px solid #e5e7eb;
  padding-left: 16px;
}

#topics-section {
  margin-left: 32px;
  border-left: 3px solid #dbeafe;
  padding-left: 16px;
}

#modes-section {
  margin-left: 48px;
  background: #f8fafc;
}

/* ---------- TITOLI ---------- */

.content h3 {
  font-size: 14px;
  font-weight: 600;
  color: #6b7280;
  margin-bottom: 14px;
  text-transform: uppercase;
  letter-spacing: 0.05em;
}

/* ---------- CONTAINER BOTTONI ---------- */

.grid,
.row,
.column {
  display: flex;
  gap: 14px;
}

.grid,
.row {
  flex-wrap: wrap;
}

.column {
  flex-direction: column;
}

/* ---------- BOTTONI GENERICI ---------- */

button {
  appearance: none;
  border: none;
  border-radius: 16px;
  padding: 14px 18px;
  font-size: 15px;
  font-weight: 600;
  background: var(--primary);
  color: #ffffff;
  cursor: pointer;
  box-shadow: 0 4px 10px rgba(59,130,246,0.25);
}


button:active {
  transform: scale(0.97);
}

button:disabled {
  background: #e5e7eb;
  color: #9ca3af;
  box-shadow: none;
  cursor: not-allowed;
}

/* ---------- BOTTONI STEP FINALI ---------- */

#modes-section button {
  flex: 1;
  padding: 18px;
  font-size: 16px;
}

/* ---------- META INFO (breadcrumb) ---------- */

.exercise-progress {
  font-size: 13px;
  color: #6b7280;
}

/* ---------- AREA GENITORI ---------- */

.parents-btn {
  background: #f2f4f8;
  color: #333;
  border-radius: 14px;
  padding: 8px 14px;
  font-size: 14px;
  font-weight: 500;
  box-shadow: none;
}

.parents-btn:active {
  transform: scale(0.97);
}

/* ---------- UTILITIES ---------- */

.hidden {
  display: none;
}
/* =========================
   STATO SELEZIONATO
   ========================= */

button.is-selected {
  background: #1e40af;               /* blu più profondo */
  box-shadow: 0 0 0 3px #bfdbfe;      /* outline chiaro */
}

/* per livelli non attivi ma già superati */
button.is-dimmed {
  background: #93c5fd;
  box-shadow: none;
  opacity: 0.85;
}