/* ==========================================================================
   COMPONENT: EXPERTISE SYSTEM (`02 / EXPERTISE`)
   ========================================================================== */

.expertise-system-container {
  display: flex;
  flex-direction: column;
  gap: 2.5rem;
}

.expertise-pillars-wrapper {
  display: grid;
  grid-template-columns: repeat(3, 1fr);
  gap: 1.5rem;
}

.expertise-column {
  border: 1px solid var(--border-subtle);
  background-color: var(--surface-base);
  display: flex;
  flex-direction: column;
  transition: border-color var(--duration-fast) var(--ease-precise);
}

.expertise-column:hover {
  border-color: var(--border-medium);
}

.expertise-col-header {
  padding: 1.5rem;
  border-bottom: 1px solid var(--border-subtle);
  background-color: var(--surface-subtle);
  display: flex;
  justify-content: space-between;
  align-items: center;
}

.expertise-col-title {
  font-family: var(--font-mono);
  font-size: 0.88rem;
  font-weight: 700;
  letter-spacing: 0.14em;
  text-transform: uppercase;
  color: var(--accent-primary);
}

.expertise-col-num {
  font-family: var(--font-mono);
  font-size: 0.75rem;
  color: var(--text-muted);
}

.expertise-items-list {
  padding: 1rem;
  display: flex;
  flex-direction: column;
  gap: 0.75rem;
}

.capability-item {
  padding: 1rem;
  border: 1px solid transparent;
  background-color: transparent;
  transition: all var(--duration-fast) var(--ease-precise);
}

.capability-item:hover {
  background-color: var(--surface-card);
  border-color: var(--border-subtle);
  transform: translateX(4px);
}

.capability-header {
  display: flex;
  align-items: baseline;
  justify-content: space-between;
  margin-bottom: 0.35rem;
}

.capability-name {
  font-family: var(--font-sans);
  font-size: 0.95rem;
  font-weight: 600;
  color: var(--text-primary);
}

.capability-index {
  font-family: var(--font-mono);
  font-size: 0.68rem;
  color: var(--text-muted);
}

.capability-desc {
  font-size: 0.84rem;
  color: var(--text-muted);
  line-height: 1.5;
}

@media (max-width: 1023px) {
  .expertise-pillars-wrapper {
    grid-template-columns: 1fr;
  }
}