diff --git a/assets/accents.json b/assets/accents.json
new file mode 100644
index 00000000..601d2ee5
--- /dev/null
+++ b/assets/accents.json
@@ -0,0 +1,25 @@
+{
+    "anndata": [["orange", [0.711, 0.138, 51]]],
+    "scanpy": [
+        ["cerise", [0.608, 0.209, 1]],
+        ["mandy", [0.634, 0.1737, 22]]
+    ],
+    "mudata": [["green", [0.686, 0.134, 154.4]]],
+    "muon": [["aquamarine", [0.863, 0.163, 154.5]]],
+    "spatialdata": [["blue", [0.714, 0.2, 247.3]]],
+    "squidpy": [["violet", [0.72, 0.112, 279]]],
+    "scirpy": [
+        ["purple", [0.601, 0.209, 358.5]],
+        ["orange", [0.7824, 0.156, 69]]
+    ],
+    "pertpy": [
+        ["blue", [0.5, 0.1, 249]],
+        ["red", [0.595, 0.177, 14]]
+    ],
+    "scvi": [["yellow", [0.824, 0.1634, 81]]],
+    "scverse": [
+        ["deep-blue", [0.405, 0.205, 270]],
+        ["sky-blue", [0.799, 0.108, 236]],
+        ["gold", [0.758, 0.2, 92]]
+    ]
+}
diff --git a/assets/main.scss b/assets/main.scss
index 41554d2c..bd57f5f7 100644
--- a/assets/main.scss
+++ b/assets/main.scss
@@ -1,28 +1,21 @@
 // Neutral colors come straight from Bootstrap’s tokens (--bs-bg-*, --bs-fg-*, --bs-border-*),
 // which carry their own dark values. Only the brand hues and a few measures live here.
+// The scverse and package accents come from accents.json, passed in by layouts/partials/head.html.
+@import "hugo:vars";
 :root {
-    /* stylelint-disable color-no-hex -- the one place the brand hues are spelled out */
-    --anndata-orange: #e5864b;
-    --scanpy-cerise: #de367b;
-    --scanpy-mandy: #e05559;
-    --mudata-green: #4ab274;
-    --muon-aquamarine: #6cf1a1;
-    --spatialdata-blue: #40a9ff;
-    --squidpy-violet: #969dea;
-    --scirpy-purple: #da347f;
-    --pertpy-blue: #30679a;
-    --pertpy-red: #d2455e;
-    --scvi-yellow: #fbb822;
-    --scverse-deep-blue: #262fb5; // the darker end of the Join button gradient
-    --scverse-sky-blue: #74c8fa; // the lighter end
-    --scverse-gold: #d4ac00;
-    --github-black: #171b21;
-    --discourse-yellow: #f7f0b1;
-    --youtube-red: #e03021;
-    --zulip-blue: #62a3f0;
-    --bluesky-blue: #0a7aff;
-    --linkedin-blue: #0a66c2;
-    /* stylelint-enable color-no-hex */
+    @each $pkg, $colors in $accents {
+        @each $name, $color in $colors {
+            --#{$pkg}-#{$name}: #{$color};
+        }
+    }
+    /* stylelint-disable function-disallowed-list -- the one place the third-party brand hues are spelled out */
+    --github-black: oklch(0.22 0.013 258);
+    --discourse-yellow: oklch(0.9458 0.08 102);
+    --youtube-red: oklch(0.59 0.213 29.7);
+    --zulip-blue: oklch(0.705 0.132 254);
+    --bluesky-blue: oklch(0.6035 0.22 257.8);
+    --linkedin-blue: oklch(0.516 0.163 254.7);
+    /* stylelint-enable function-disallowed-list */
 
     // Call-to-action buttons: white on the blue gradient (its light end darkened to keep 4.5:1),
     // black on the bright hover gradient
diff --git a/layouts/partials/head.html b/layouts/partials/head.html
index 65b03fc3..6c66b6db 100644
--- a/layouts/partials/head.html
+++ b/layouts/partials/head.html
@@ -7,7 +7,18 @@
 {{ end }}
 <link rel="canonical" href="{{ .Permalink }}" />
 
-{{ $styles := resources.Get "main.scss" | toCSS | minify }}
+{{/* accents.json → Sass map (pkg: (name: oklch(…), …), …); JSON objects are unordered, so each package lists [name, [L, C, H]] pairs, primary first */}}
+{{ $accentsJSON := resources.Get "accents.json" }}
+{{ $accentsJSON.Publish }}{{/* served at /accents.json for other sites to reuse */}}
+{{ $accents := slice }}
+{{ range $pkg, $colors := $accentsJSON | transform.Unmarshal }}
+  {{ $pairs := slice }}
+  {{ range $colors }}
+    {{ $pairs = $pairs | append (printf "%s: oklch(%s)" (index . 0) (delimit (index . 1) " ")) }}
+  {{ end }}
+  {{ $accents = $accents | append (printf "%s: (%s)" $pkg (delimit $pairs ", ")) }}
+{{ end }}
+{{ $styles := resources.Get "main.scss" | toCSS (dict "vars" (dict "accents" (css.Unquoted (printf "(%s)" (delimit $accents ", "))))) | minify }}
 {{ $script := resources.Get "main.ts" | js.Build (dict "format" "esm" "minify" true "sourceMap" "linked" "externals" (slice "bootstrap" "pagefind")) }}
 <link rel="preload" as="font" type="font/woff2" href="/fonts/Inter/Inter-VariableFont_slnt,wght.woff2" crossorigin />
 <link rel="stylesheet" type="text/css" href="/bootstrap/css/bootstrap.min.css" />