diff --git a/plans/astro-refactor/task-15e-responsive-css.md b/plans/astro-refactor/task-15e-responsive-css.md
index a809117..1224ed9 100644
--- a/plans/astro-refactor/task-15e-responsive-css.md
+++ b/plans/astro-refactor/task-15e-responsive-css.md
@@ -82,3 +82,44 @@ read the legacy files, so deleting `responsive.css` and breaking every mobile
 layout passes it cleanly. Before you claim done, diff the **built** CSS
 (`dist/_astro/*.css`) against `main` and enumerate every declaration that
 disappeared. Each one is either present elsewhere or a regression.
+
+## Attempt 1 stopped short — and the goal as written is not reachable yet
+
+Preserved as `rejected/15e-attempt-1` (`d2312d7`). Start by reading that diff:
+it ported rules into `ChapterHero`, `FleetDiagram`, `RouteTable`, `WorktreeMap`,
+`LanguageToggle`, `ReadingProgress`, `agents.astro`, `full-guide.astro` and
+`tokens.css`, and it added `pixelmatch`, `pngjs` and `postcss` plus a working
+screenshot-compare harness. Reuse all of it. It never finished the comparison
+loop and never committed on its own.
+
+It also deleted `responsive.css` while **`full-guide/index.html` still links
+it**. That page is the live site until task 20 cuts over; deleting the
+stylesheet strips it. `src/components/islands/GuideSelector.astro` still
+references it too.
+
+So the "delete it" checkbox in this brief cannot be honestly ticked before the
+cutover. Do not tick it, and do not delete the file. **The deliverable is
+everything up to the deletion:**
+
+- Every rule `responsive.css` provides to an Astro route lives with the
+  component that needs it, or in `tokens.css`.
+- No `.astro` file and no Astro layout links `responsive.css` any more.
+- `full-guide/index.html` still links it, unchanged, and still renders exactly
+  as it does today.
+- A list, in this file, of the rules that remain in `responsive.css` solely for
+  the legacy page — that list is the deletion checklist task 20 will execute.
+
+Amend the "Done when" boxes to match before you start, and say in your final
+report that the file is intentionally still present.
+
+### One rule to port properly while you are in there
+
+`.route-meter span` animates `height: var(--score)` — a layout property, which
+task 18 was meant to eliminate. 18 changed it in `responsive.css` and that
+change was reverted (`0bca43c`) because it belongs in the component, not in a
+legacy file. When you port this rule, port it as
+`transform: scaleY(var(--score)); transform-origin: bottom` with `height: 100%`.
+`--score` is set inline as a percentage (`--score:92%`) by `GuideSelector.astro`
+and `full-guide.astro`; a percentage in `scaleY()` is valid and was verified
+rendering correctly at `matrix(1, 0, 0, 0.92, 0, 0)`. Leave the legacy
+`responsive.css` copy of the rule alone.