diff --git a/docs/architecture.adoc b/docs/architecture.adoc
index e6a4d26..ca04485 100644
--- a/docs/architecture.adoc
+++ b/docs/architecture.adoc
@@ -89,17 +89,33 @@ covering accented Latin place names (Slovak, Czech, Polish, German,
 ...). Labels in other scripts (Cyrillic, Greek, CJK, ...) won't render
 offline, since those glyph ranges aren't vendored.
 
-`public/js/map.js`'s `OFFLINE_THEME` also nudges a handful of color
-roles (background, water, wood, buildings, the two road-importance
-tiers) from `protomaps-themes-base`'s stock "light" theme towards the
-online "liberty" style's actual palette (sampled from its style JSON),
-so Online/Offline don't look like two different apps. This is
-deliberately partial — most roles (labels, casings, minor terrain
-fills, ...) are left at their theme defaults — not the kind of
-full per-layer recolor a previous iteration of this app did (and
-removed, along with any dependency on OsmAnd's own tile server, which
-this app cannot use per OsmAnd's terms restricting tile use to "personal,
-non-commercial use within OsmAnd applications and platforms").
+`public/js/map.js`'s `OFFLINE_THEME` nudges a couple dozen color roles
+from `protomaps-themes-base`'s stock "light" theme towards the
+National Park Service's own "Park Tiles" cartography — a warm,
+Harpers-Ferry-Center-derived look. A few of these values are the
+genuine paint colors pulled from a public Park Tiles style JSON
+(`nps.gov/lib/npmap.js/style/ck72fwp2642dv07o7tbqinvz4.json`, the
+"Imagery" variant — the only one of NPS's four styles served from a
+plain, unauthenticated URL; "Standard"/"Slate"/"Light" resolve through
+Mapbox Studio's private API with an access token, which isn't
+something to piggyback on even though it's technically visible in
+their own JS bundle) — background, the park/protected-area green, the
+two road-importance tiers, and the park-boundary line color. The rest
+are reasoned to match that same warm family (olive greens, muted blue)
+rather than sourced. This is deliberately partial — labels, casings,
+and roles with no clean real-color anchor are left at theme
+defaults — not the kind of full per-layer recolor a previous iteration
+of this app did (and removed, along with any dependency on OsmAnd's
+own tile server, which this app cannot use per OsmAnd's terms
+restricting tile use to "personal, non-commercial use within OsmAnd
+applications and platforms").
++
+Recreating the *color choices* is fine — that's not the kind of thing
+a data license restricts — but the actual Park Tiles *service* stays
+off-limits: its OSM/terrain layers are licensed through Mapbox Atlas
+(a commercial, non-sublicensable data service scoped to NPS), and it's
+built for park visitors specifically (park-unit and trailhead
+labeling prioritized), not general-purpose worldwide cartography.
 
 No PMTiles file ships with the repository — it is expected to be
 supplied locally (see `docs/development.adoc`) and stays gitignored
diff --git a/public/js/map.js b/public/js/map.js
index b44bc6f..33990dd 100644
--- a/public/js/map.js
+++ b/public/js/map.js
@@ -20,23 +20,46 @@ const ONLINE_STYLE = "https://tiles.openfreemap.org/styles/liberty";
 const protocol = new pmtiles.Protocol();
 addProtocol("pmtiles", protocol.tile);
 
-// A few color roles nudged from protomaps-themes-base's stock "light" theme
-// towards the online OpenFreeMap "liberty" style's actual palette (sampled
-// from its style JSON — see docs/architecture.adoc), so switching between
-// Online/Offline doesn't look like two different apps. Not a full recolor:
-// most roles (labels, casings, minor terrain fills, ...) are left at their
-// theme defaults.
+// Nudged from protomaps-themes-base's stock "light" theme towards the
+// National Park Service's own "Park Tiles" cartography — a warm,
+// Harpers-Ferry-Center-derived look. Not their actual map: a handful of
+// values below (marked) are the genuine paint colors pulled from a public
+// Park Tiles style JSON
+// (nps.gov/lib/npmap.js/style/ck72fwp2642dv07o7tbqinvz4.json, the "Imagery"
+// variant — the only one of their four styles served from a plain,
+// unauthenticated URL; "Standard"/"Slate"/"Light" resolve through Mapbox
+// Studio's private API with an access token, which isn't something to
+// piggyback on even though it's technically visible in their own JS bundle).
+// The rest are reasoned to match that same family (warm cream ground, olive
+// greens, muted blue) rather than sourced. Not a full recolor: labels,
+// casings, and roles with no clean real-color anchor are left at theme
+// defaults.
+//
+// Recreating the color choices is legitimate — that's not the kind of thing
+// a data license restricts (see docs/architecture.adoc's "Offline maps"
+// section) — what stays off-limits is their actual tile *service*: its
+// OSM/terrain layers are licensed through Mapbox Atlas, a commercial,
+// non-sublicensable data service scoped to NPS.
 const OFFLINE_THEME = {
   ...protomaps_themes_base.namedTheme("light"),
-  background: "#f8f4f0",
-  earth: "#f8f4f0",
-  water: "#9ebdff",
-  wood_a: "#ace38c",
-  wood_b: "#ace38c",
-  buildings: "#dcd9d6",
-  highway: "#f2934a",
-  major: "#ffeeaa",
-  link: "#ffeeaa",
+  background: "#f9f6ef", // real: Park Tiles' own background, hsl(40, 37%, 97%)
+  earth: "#f9f6ef",
+  water: "#a3cedf",
+  wood_a: "#c3d9a0",
+  wood_b: "#b3c98f",
+  scrub_a: "#d6e3b8",
+  scrub_b: "#cddba8",
+  park_a: "#c8e2a0",
+  park_b: "#b3e378", // real: Park Tiles' protected-area/park-point green
+  sand: "#f0e4c4",
+  beach: "#f0e4c4",
+  buildings: "#ded7cc",
+  pedestrian: "#e9e2d8",
+  highway: "#fdefbe", // real: Park Tiles' primary/highway road color
+  major: "#fef7dd", // real: Park Tiles' secondary road color
+  minor: "#fffdf8",
+  link: "#fef7dd",
+  boundaries: "#546619", // real: Park Tiles' park-boundary line color
 };
 
 function offlineStyle() {