diff --git a/CLAUDE.md b/CLAUDE.md
index d89f7ad..a3afe58 100644
--- a/CLAUDE.md
+++ b/CLAUDE.md
@@ -63,6 +63,46 @@ are to raise the threshold, weight the `hasRCT` and `hasMeta` signals that the
implying a distinction the data does not carry. Picking one is the owner's
call.
+**What changed on 2026-09-23 is what the interface shows, not the field.** A
+constant is survivable in a data file and not on a page: `strong` was printed
+on all 204 cards, and `study.html` drew it as a filled meter reading "Strong
+Evidence Base" at 80 or 90 per cent. A bar at 80 per cent implies a measurement
+against a maximum; there is no maximum and nothing was measured.
+
+The two signals the tier short-circuits past are **not** constants, and they
+are now computed into `master-list.json` by `evidenceSignals()` and reported
+rather than scored:
+
+| signal | studies |
+|---|---|
+| cites experimental or quasi-experimental work | 61 of 204 |
+| cites a systematic review or meta-analysis | 7 of 204 |
+
+The card footer carries the reference count (4 or 5, so it says something) and
+a marker for the stronger of the two signals. The study page states both as
+facts. And the sidebar has an **Evidence facet** filtering on them, with both
+selected meaning *both* rather than either, because a reader asking for
+experimental work and a review wants the studies carrying both.
+
+`evidenceTier()` is untouched and still returns `strong` for all 204. When the
+editorial question is settled, that is the one function to change.
+
+## The interface on a phone
+
+Three things were measured at 390x844 on 2026-09-23 and fixed:
+
+- **The site had no name.** `.site-logo span:last-child { display: none }` at
+ 480px left a blue square in the corner and nothing else. The wordmark
+ shortens to "Dev" instead, which the markup carries in its own span.
+- **The welcome panel filled the whole first screen.** Over 600px of
+ explanation before a single study, so a visitor landed on a help panel rather
+ than on a library. Its feature grid is hidden and its description clamps to
+ three lines below 700px; the panel is still dismissible and the text is still
+ there. Two study cards are now above the fold.
+- **The card footer put "Read study" and "5 sources" each across two lines**,
+ because a link and three metadata items were competing for one row. The link
+ takes its own line below 460px.
+
## Watch out for
- **The sitemap uses query strings.** Every study is
diff --git a/about.html b/about.html
index 693585c..4d8cf54 100644
--- a/about.html
+++ b/about.html
@@ -39,7 +39,7 @@