.problem {
  background: var(--bg-2);
}

.problem__grid {
  display: grid;
  grid-template-columns: repeat(auto-fit, minmax(260px, 1fr));
  gap: 1.5rem;
  margin-top: 3rem;
}

.problem__card {
  background: var(--bg-3);
  border: 1px solid var(--border);
  border-radius: var(--radius-lg);
  padding: 1.75rem;
  position: relative;
  overflow: hidden;
  transition: border-color var(--transition-base);
}

.problem__card::before {
  content: '';
  position: absolute;
  top: 0; left: 0; right: 0;
  height: 2px;
  background: var(--lime);
  opacity: 0;
  transition: opacity var(--transition-base);
}

.problem__card:hover {
  border-color: var(--border-lime);
}

.problem__card:hover::before {
  opacity: 1;
}

.problem__num {
  font-family: var(--font-display);
  font-size: 48px;
  color: #bbe000;
  line-height: 1;
  margin-bottom: 1rem;
}

.problem__card h3 {
  font-size: 17px;
  font-weight: 600;
  margin-bottom: 0.5rem;
}

.problem__card p {
  font-size: 14px;
  color: var(--text-muted);
  line-height: 1.65;
}

#problema .section-sub {
  text-align: left;
  margin-left: 0;
}