.arch-toolbar {
  display: flex;
  justify-content: space-between;
  align-items: center;
  flex-wrap: wrap;
  gap: 0.75rem;
  margin-bottom: 1rem;
}

.arch-controls {
  display: flex;
  gap: 0.4rem;
}

.arch-controls button {
  width: 34px; height: 34px;
  display: grid;
  place-items: center;
  border: 1px solid var(--border);
  background: var(--surface);
  color: var(--text-2);
  border-radius: var(--radius);
  cursor: pointer;
  font-family: var(--font-mono);
}

.arch-controls button:hover { color: var(--accent); border-color: var(--accent); }

.arch-legend {
  display: flex;
  gap: 1rem;
  font-size: var(--fs-00);
  color: var(--text-2);
  flex-wrap: wrap;
}

.arch-legend .item { display: flex; align-items: center; gap: 0.4rem; }
.arch-legend .swatch { width: 9px; height: 9px; border-radius: 2px; }

.arch-stage {
  border: 1px solid var(--border);
  border-radius: var(--radius);
  background:
    linear-gradient(var(--bg-2) 1px, transparent 1px) 0 0 / 24px 24px,
    linear-gradient(90deg, var(--bg-2) 1px, transparent 1px) 0 0 / 24px 24px,
    var(--bg);
  overflow: hidden;
  height: min(72vh, 760px);
  touch-action: none;
  cursor: grab;
}

.arch-stage:active { cursor: grabbing; }

.arch-stage svg { width: 100%; height: 100%; display: block; }

.arch-node rect {
  fill: var(--surface);
  stroke: var(--border);
  stroke-width: 1.5;
  transition: stroke var(--transition), filter var(--transition);
}

.arch-node text {
  fill: var(--text);
  font-family: var(--font-mono);
  font-size: 12px;
  pointer-events: none;
}

.arch-node .type-chip {
  fill-opacity: 0.9;
}

.arch-node:hover rect, .arch-node:focus rect {
  stroke: var(--accent);
}

.arch-node.selected rect {
  stroke: var(--accent);
  stroke-width: 2.5;
  filter: drop-shadow(0 0 6px rgba(46, 204, 135, 0.4));
}

.arch-edge {
  stroke: var(--border);
  stroke-width: 1.5;
  fill: none;
}

.arch-edge.flow {
  stroke: var(--accent);
  stroke-dasharray: 5 5;
  animation: flow-dash 1.2s linear infinite;
}

@keyframes flow-dash {
  to { stroke-dashoffset: -20; }
}

@media (prefers-reduced-motion: reduce) {
  .arch-edge.flow { animation: none; }
}

.arch-meta {
  margin-top: 1.25rem;
  display: grid;
  grid-template-columns: 1fr 1fr;
  gap: 1rem;
}

@media (max-width: 720px) {
  .arch-meta { grid-template-columns: 1fr; }
  .arch-stage { height: 60vh; }
}