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src/styles/base.css

@@ -163,6 +163,8 @@ p { overflow-wrap: break-word; }
 .measure { max-width: var(--measure); }
 
 /* Night surface */
+::selection { background: var(--selection); color: var(--selection-ink); }
+
 .night {
   background: var(--night);
   color: var(--ink-on-night);

src/styles/tokens.css

@@ -46,6 +46,10 @@
      page's current phase), at most twice per page. Never for text, links or decoration. */
   --signal: #58C8D8;
 
+  /* Selected text: the logo cyan with base ink on it (about 9:1), the same on paper and night. */
+  --selection:     var(--logo-cyan);
+  --selection-ink: var(--ink-base);
+
   /* Immutable copies for resetting inside a .night or overlay context */
   --ink-base:       #1A1A18;
   --ink-muted-base: #57564F;