.related-materials {
  margin: 32px 0;
  padding: 20px;
  border-radius: 14px;
  border: 1px solid var(--border-color);
  background: var(--card-bg);
  box-shadow: var(--card-shadow);
  color: var(--text-color);
}

.related-materials__header {
  display: flex;
  justify-content: space-between;
  gap: 12px;
  flex-wrap: wrap;
  align-items: center;
}

.related-materials__eyebrow {
  text-transform: uppercase;
  letter-spacing: 0.08em;
  font-size: 11px;
  color: var(--text-muted);
  font-weight: 700;
}

.related-materials__title {
  font-size: 20px;
  font-weight: 700;
  color: var(--text-color);
}

.related-materials__hint {
  margin: 6px 0 14px 0;
  color: var(--text-muted);
  font-size: 14px;
}

.related-materials__switch {
  display: inline-flex;
  padding: 4px;
  border-radius: 10px;
  background: var(--bg-color);
  border: 1px solid var(--border-color);
  gap: 4px;
}

.related-switch-btn {
  border: none;
  background: transparent;
  color: var(--text-color);
  padding: 8px 12px;
  border-radius: 8px;
  font-weight: 600;
  cursor: pointer;
  transition: all 0.18s ease;
}

.related-switch-btn:hover {
  background: rgba(var(--primary-color-rgb), 0.08);
  color: var(--primary-color);
}

.related-switch-btn.is-active {
  background: var(--primary-color);
  color: #fff;
  box-shadow: 0 6px 16px rgba(var(--primary-color-rgb), 0.25);
}

.related-materials__views {
  display: grid;
  gap: 14px;
}

.related-view {
  background: var(--bg-color);
  border: 1px solid var(--border-color);
  border-radius: 12px;
  padding: 12px;
}

.related-graph {
  min-height: 260px;
  background: linear-gradient(135deg, rgba(var(--primary-color-rgb), 0.06), rgba(var(--accent-color-rgb), 0.05)),
    var(--card-bg);
  border-radius: 10px;
  position: relative;
  overflow: hidden;
  border: 1px dashed rgba(var(--primary-color-rgb), 0.25);
}

.related-graph__svg {
  width: 100%;
  height: 100%;
}

.related-graph__label {
  user-select: none;
  fill: var(--text-color);
}

.related-list {
  list-style: none;
  margin: 0;
  padding: 0;
  display: grid;
  gap: 10px;
}

.related-list__item {
  display: grid;
  grid-template-columns: auto 1fr;
  gap: 12px;
  align-items: flex-start;
  padding: 10px 12px;
  border-radius: 10px;
  background: var(--card-bg);
  border: 1px solid var(--border-color);
  box-shadow: var(--card-shadow);
}

.related-list__pill {
  display: inline-flex;
  align-items: center;
  justify-content: center;
  padding: 6px 10px;
  border-radius: 999px;
  font-size: 12px;
  font-weight: 700;
  text-transform: uppercase;
  letter-spacing: 0.04em;
  color: var(--primary-color);
  background: rgba(var(--primary-color-rgb), 0.14);
}

.related-list__pill--conspect { background: rgba(var(--accent-color-rgb), 0.14); color: var(--accent-color); }
.related-list__pill--special_conspect { background: rgba(var(--secondary-color-rgb), 0.14); color: var(--secondary-color); }
.related-list__pill--task { background: rgba(var(--success-color-rgb), 0.16); color: var(--success-color); }
.related-list__pill--topic { background: rgba(var(--warning-color-rgb), 0.18); color: var(--warning-color); }
.related-list__pill--subject { background: rgba(var(--primary-color-rgb), 0.16); color: var(--primary-color); }
.related-list__pill--section { background: rgba(var(--accent-color-rgb), 0.12); color: var(--accent-color); }
.related-list__pill--center { background: rgba(var(--info-color-rgb), 0.14); color: var(--info-color); }

.related-list__title {
  color: var(--text-color);
  font-weight: 700;
  text-decoration: none;
}

.related-list__title:hover {
  text-decoration: underline;
}

.related-list__meta {
  color: var(--text-muted);
  font-size: 13px;
  margin-top: 2px;
}

.related-list__relation {
  margin-top: 6px;
  color: var(--primary-color);
  font-size: 12px;
  text-transform: uppercase;
  letter-spacing: 0.04em;
}

.related-empty {
  color: var(--text-muted);
  text-align: center;
  padding: 16px 12px;
  background: var(--bg-color);
  border-radius: 10px;
  border: 1px dashed var(--border-color);
}

@media (max-width: 640px) {
  .related-materials {
    padding: 16px;
  }

  .related-materials__title {
    font-size: 18px;
  }

  .related-graph {
    min-height: 220px;
  }
}