/* ============================================================
   Transparency Module — Metric Cards
   ============================================================ */

#metrics-grid {
  display: grid;
  grid-template-columns: repeat(4, 1fr);
  gap: var(--space-4);
}

.metric-card {
  background-color: var(--color-surface);
  border: var(--border-subtle);
  border-radius: var(--radius-lg);
  padding: var(--space-5);
  position: relative;
  transition: border-color var(--transition-base), box-shadow var(--transition-base);
}

.metric-sparkline-svg {
  color: var(--color-primary);
}

.metric-card:hover {
  border-color: var(--color-primary);
  box-shadow: var(--shadow-glow-primary);
}

.metric-card-header {
  display: flex;
  align-items: center;
  justify-content: space-between;
  margin-bottom: var(--space-3);
}

.metric-label {
  font-family: var(--font-mono);
  font-size: 0.75rem;
  letter-spacing: 0.08em;
  text-transform: uppercase;
  color: var(--color-text-muted);
}

.metric-info-btn {
  background: none;
  border: none;
  cursor: pointer;
  color: var(--color-text-muted);
  padding: var(--space-1);
  border-radius: var(--radius-sm);
  transition: color var(--transition-fast);
  display: flex;
  align-items: center;
}

.metric-info-btn:hover,
.metric-info-btn:focus-visible {
  color: var(--color-primary);
}

.metric-value {
  display: flex;
  align-items: baseline;
  gap: var(--space-1);
  margin-bottom: var(--space-3);
}

.metric-number {
  font-family: var(--font-mono);
  font-size: 2rem;
  font-weight: 700;
  color: var(--color-text);
  line-height: 1;
}

.metric-unit {
  font-family: var(--font-mono);
  font-size: 0.8125rem;
  color: var(--color-text-muted);
}

.metric-sparkline {
  margin-bottom: var(--space-2);
}

.metric-tooltip {
  position: absolute;
  bottom: calc(100% + var(--space-2));
  left: 50%;
  transform: translateX(-50%);
  background-color: var(--color-surface-raised);
  border: var(--border-subtle);
  border-radius: var(--radius-sm);
  padding: var(--space-3) var(--space-4);
  font-size: 0.8125rem;
  color: var(--color-text-muted);
  max-width: 240px;
  width: max-content;
  z-index: 10;
  box-shadow: 0 4px 16px rgba(15, 23, 42, 0.18);
  line-height: 1.5;
}

.metric-tooltip::after {
  content: '';
  position: absolute;
  top: 100%;
  left: 50%;
  transform: translateX(-50%);
  border: 6px solid transparent;
  border-top-color: var(--color-border);
}

@media (max-width: 1024px) {
  #metrics-grid {
    grid-template-columns: repeat(2, 1fr);
  }
}

@media (max-width: 640px) {
  #metrics-grid {
    grid-template-columns: 1fr;
  }
}