/* ═══════════════════════════════════════════
   PROBLEM BAR — Balanced Alignment
   ═══════════════════════════════════════════ */
.problem-bar {
  padding: 50px 0;
  background: var(--slate-50);
  border-bottom: 1px solid var(--slate-200);
}

.problem-bar__label {
  text-align: center;
  font-size: 0.9rem;
  font-weight: 600;
  color: var(--slate-500);
  text-transform: uppercase;
  letter-spacing: 0.05em;
  margin-bottom: 40px;
}

.problem-bar__grid {
  display: grid;
  grid-template-columns: repeat(4, 1fr);
  gap: 30px;
}

.problem-bar__item {
  display: flex;
  flex-direction: column;
  gap: 12px;
  padding: 24px;
  background: #fff;
  border-radius: var(--radius);
  border: 1px solid var(--slate-200);
  box-shadow: var(--shadow-sm);
  transition: transform 0.3s var(--ease), box-shadow 0.3s var(--ease);
}

.problem-bar__item:hover {
  transform: translateY(-4px);
  box-shadow: var(--shadow);
}

.problem {
  font-size: 0.85rem;
  font-weight: 600;
  color: var(--slate-400);
  text-decoration: line-through;
  display: flex;
  align-items: center;
  gap: 8px;
}

.problem::before {
  content: "×";
  font-size: 1.2rem;
  color: #ef4444;
  /* red-500 */
}

.solution {
  font-size: 1rem;
  font-weight: 700;
  color: var(--slate-900);
  display: flex;
  align-items: center;
  gap: 8px;
}

.solution::before {
  content: "→";
  color: var(--primary);
  font-weight: 400;
}

/* Responsive */
@media (max-width: 1024px) {
  .problem-bar__grid {
    grid-template-columns: repeat(2, 1fr);
  }
}

@media (max-width: 640px) {
  .problem-bar__grid {
    grid-template-columns: 1fr;
  }
}