.oir-relationship-graph {
  border: 1px solid rgba(72, 86, 122, 0.18);
  border-radius: 18px;
  background:
    radial-gradient(circle at 20% 10%, rgba(63, 81, 181, 0.10), transparent 32rem),
    linear-gradient(180deg, rgba(248, 250, 252, 0.98), rgba(241, 245, 249, 0.98));
  box-shadow: 0 18px 48px rgba(15, 23, 42, 0.10);
  margin: 1.5rem 0;
  overflow: hidden;
  user-select: none;
}

.oir-relationship-graph__toolbar {
  align-items: center;
  background: rgba(255, 255, 255, 0.78);
  border-bottom: 1px solid rgba(72, 86, 122, 0.14);
  display: flex;
  flex-wrap: wrap;
  gap: 0.5rem;
  justify-content: space-between;
  padding: 0.75rem;
}

.oir-relationship-graph__toolbar-group {
  display: flex;
  gap: 0.5rem;
}

.oir-relationship-graph__button {
  background: #1f2a44;
  border: 0;
  border-radius: 999px;
  color: #fff;
  cursor: pointer;
  font-size: 0.75rem;
  font-weight: 700;
  letter-spacing: 0.04em;
  padding: 0.45rem 0.8rem;
  text-transform: uppercase;
}

.oir-relationship-graph__button:hover {
  background: #31446f;
}

.oir-relationship-graph__hint {
  color: #526074;
  font-size: 0.78rem;
}

.oir-relationship-graph__viewport {
  height: min(72vh, 760px);
  min-height: 460px;
  overflow-x: scroll;
  overflow-y: auto;
  touch-action: none;
  user-select: none;
}

.oir-relationship-graph svg {
  cursor: grab;
  display: block;
  touch-action: none;
  user-select: none;
}

.oir-relationship-graph svg.is-panning {
  cursor: grabbing;
}

.oir-graph-edge {
  fill: none;
  stroke: rgba(71, 85, 105, 0.42);
  stroke-width: 2;
}

.oir-graph-edge-label {
  fill: #475569;
  font-size: 12px;
  font-weight: 700;
  letter-spacing: 0.02em;
}

.oir-graph-node rect {
  fill: #ffffff;
  stroke: rgba(30, 41, 59, 0.18);
  stroke-width: 1.4;
  filter: drop-shadow(0 8px 12px rgba(15, 23, 42, 0.12));
}

.oir-graph-node--source rect {
  fill: #fff8eb;
  stroke: rgba(180, 83, 9, 0.28);
}

.oir-graph-node--knowledge rect {
  fill: #eef6ff;
  stroke: rgba(37, 99, 235, 0.28);
}

.oir-graph-node:hover rect {
  stroke: #1d4ed8;
  stroke-width: 2.2;
}

.oir-graph-node text {
  fill: #172033;
  font-size: 13px;
  pointer-events: none;
  user-select: none;
}

.oir-graph-node__id {
  font-size: 12px;
  font-weight: 800;
  letter-spacing: 0.02em;
}

.oir-graph-node__title {
  fill: #475569;
  font-size: 11px;
}

.oir-graph-lane-title {
  fill: #334155;
  font-size: 14px;
  font-weight: 800;
  letter-spacing: 0.08em;
  text-transform: uppercase;
}