diff --git a/media/preview.css b/media/preview.css
index c67b333..fa944b0 100644
--- a/media/preview.css
+++ b/media/preview.css
@@ -35,16 +35,13 @@ del { text-decoration: line-through; opacity: 0.7; }
 .cw-del-claude { background: rgba(188,140,255,0.13); text-decoration: line-through; text-decoration-color: #bc8cff; }
 .cw-del-none   { background: var(--vscode-diffEditor-removedTextBackground, rgba(248,81,73,0.11)); text-decoration: line-through; opacity: 0.7; }
 
-/* whole-block ops: an added block is an insertion (author-colored inside via cw-by-*);
-   a standalone removed block is neutral struck (adjacency heuristic fallback) */
+/* whole-block ops: an added block is an insertion (its author runs are emitted as
+   cw-ins-* via colorByAuthor with kind="ins"); a standalone removed block is neutral
+   struck (adjacency heuristic fallback) */
 .cw-added   { background: transparent; }
 .cw-removed { background: var(--vscode-diffEditor-removedTextBackground, rgba(248,81,73,0.10)); text-decoration: line-through; opacity: 0.65; }
 .cw-changed { outline: none; }
 
-/* added-block author runs (colorByAuthor sentinels) read as insertions */
-.cw-by-human  { background: rgba(63,185,80,0.14);  border-bottom: 2px solid #3fb950; text-decoration: none; }
-.cw-by-claude { background: rgba(88,166,255,0.15); border-bottom: 2px solid #58a6ff; text-decoration: none; }
-.cw-blk.cw-by-claude, .cw-blk.cw-by-human, .cw-blk.cw-mixed { outline: 2px solid currentColor; outline-offset: 2px; background: transparent; }
 #cw-legend .cw-swatch { padding: 0 0.4em; border-radius: 3px; }
 #cw-summary .cw-prop { opacity: 0.85; }
 .cw-badge {