.legend-card {
  border-radius: var(--radius-lg);
  padding: 24px;
  margin-bottom: 20px;
}

.legend-card h2 {
  margin: 4px 0 18px;
}

.diagram-key {
  list-style: none;
  margin: 0;
  padding: 0;
  display: grid;
  grid-template-columns: repeat(auto-fit, minmax(240px, 1fr));
  gap: 14px 24px;
}

.diagram-key li {
  display: flex;
  align-items: center;
  gap: 12px;
  color: var(--muted);
  line-height: 1.5;
}

.diagram-key strong {
  color: var(--text);
}

.key-swatch {
  flex-shrink: 0;
  width: 30px;
  height: 30px;
  border-radius: 50%;
  display: flex;
  align-items: center;
  justify-content: center;
  font-weight: 800;
  font-size: 0.95rem;
}

.key-swatch-nut {
  border-radius: 4px;
  width: 30px;
  height: 8px;
  background: #f4e9d8;
}

.key-swatch-open {
  border: 2px solid var(--accent);
  color: var(--accent);
}

.key-swatch-mute {
  border: 2px solid rgba(255, 138, 158, 0.8);
  color: rgba(255, 138, 158, 0.95);
}

.key-swatch-dot {
  background: linear-gradient(180deg, var(--accent) 0%, var(--accent-strong) 100%);
  color: #0b1220;
}

@media (max-width: 760px) {
  .diagram-key {
    grid-template-columns: 1fr;
  }
}