diff --git a/frontend/src/views/MapView.vue b/frontend/src/views/MapView.vue
index 913be7f..31059ee 100644
--- a/frontend/src/views/MapView.vue
+++ b/frontend/src/views/MapView.vue
@@ -82,7 +82,7 @@ import ShopFloorMap from '../components/ShopFloorMap.vue'
 import { assetsApi } from '../api'
 import { currentTheme } from '../stores/theme'
 import { useAuthStore } from '../stores/auth'
-import { loadMapConfig, state as mapConfig } from '../composables/mapConfig'
+import { loadMapConfig, blueprintUrlFor, state as mapConfig } from '../composables/mapConfig'
 import { exportMapPdf } from '../utils/mapPdf'
 import { assetTypeLabel, assetDetailRoute } from '../utils/assetTypes'
 import { getSubtypeId } from '../utils/mapColors'
@@ -140,12 +140,18 @@ const subtypeLabel = computed(() => {
   return labels[selectedType.value.toLowerCase().replace(/_/g, ' ')] || 'All Subtypes'
 })
 
-// Generate distinct colors for subtypes
+// Auto colors for subtypes that have not been given one. Every step clears 3:1
+// against BOTH map surfaces (white blueprint and the dark navy card), so none
+// washes out; the old list ran through pale yellows and limes (#FFEB3B was
+// 1.1:1 on white) that were invisible on the light blueprint. Ordered by
+// max-min perceptual separation, so the fewer subtypes are on screen the
+// further apart their colors sit. Past roughly the fifth entry no palette can
+// keep every pair distinguishable under color-blind simulation - the legend and
+// the hover tooltip carry identity from there.
 const subtypeColorPalette = [
-  '#F44336', '#E91E63', '#9C27B0', '#673AB7', '#3F51B5',
-  '#2196F3', '#03A9F4', '#00BCD4', '#009688', '#4CAF50',
-  '#8BC34A', '#CDDC39', '#FFEB3B', '#FFC107', '#FF9800',
-  '#FF5722', '#795548', '#607D8B', '#00ACC1', '#5C6BC0'
+  '#7c4dff', '#ef6c00', '#0097a7', '#c2185b', '#1565c0',
+  '#e03131', '#e0479e', '#00897b', '#827717', '#1976d2',
+  '#d81b60', '#388e3c', '#9c4dcc', '#2e7d32'
 ]
 
 // Map subtype IDs to colors: prefer each subtype's stored color; fall back to
@@ -236,7 +242,10 @@ async function exportPdf() {
     await loadMapConfig()
     await exportMapPdf({
       assets: filteredAssets.value,
-      blueprintUrl: mapConfig.blueprintLight,
+      // blueprintUrlFor applies withBase - the raw setting value is a
+      // root-relative /api path, which 404s under a subpath mount like /ops.
+      // The PDF always uses the light blueprint: it prints on white paper.
+      blueprintUrl: blueprintUrlFor('light'),
       mapWidth: mapConfig.width,
       mapHeight: mapConfig.height,
       selectedType: selectedType.value,