fix(design): meet AA on tinted surfaces, and stop the footer inverting in dark

Full audit across home, search, rankings, admissions, compare, and primary /
secondary / special / no-data school pages, in both themes, measuring computed
styles rather than reading CSS.

Contrast: the status hues were specced against --bg-primary, but they are used
as chip text on their own tint, which sits on cards and secondary surfaces
rather than the page ground. Measured in the wild they were 3.85–4.44:1 —
under AA — on Ofsted badges, delta chips, report-card chips and metric values,
i.e. most of the product's actual signal. Darkened the light hues
(#0e6e66 → #0b625a, #9a5b00 → #7f4a00) and lifted the dark teal
(#3fb3a4 → #4fc0b0) so each clears AA on its own tint, which is the worst case
rather than the easy one. Chart and series ramps follow.

The footer was painting itself with a text token and lettering itself with a
background token: `background: var(--text-primary); color: var(--bg-secondary)`.
That reads correctly in one theme and inverts in the other — in dark mode it
became a light slab at the bottom of a dark page, with amber section headings
at 1.98:1. Added --surface-sunken and its on-* companions, which stay dark in
BOTH themes (deliberately not --surface-inverse, whose whole job is to flip),
and moved the footer onto them. Section headings were also using a status hue
purely as decoration; they are now a muted on-surface token.

The "Open full map" pill was a fixed white background with a themed text
colour, so in dark mode it rendered light violet on white at 1.84:1. Both
sides are token-driven now.

Tabular numerals are now the default for .main rather than per-component
opt-in, with prose opting back out — a handful of figures (miniNatPill,
compareRowVal, factVal) had been missed by the class-name-based pass.

Added a two-theme AA gate over home, rankings and admissions. It waits for
`transition: color` to settle first: an earlier measurement pass read
mid-transition values and reported seven failures that did not exist at rest.
Worth stating plainly — most of what a naive audit flags here is its own
artifact, and the check has to account for that to be worth having.

Co-Authored-By: Claude Opus 5 <noreply@anthropic.com>

nextjs-app/app/globals.css

@@ -45,17 +45,17 @@
     --brand-on: #fcfcfa;        /* text/icon sitting on a brand fill */
 
     /* ── Status: above / at / below the comparison point ────────────── */
-    --status-above: #0e6e66;    /* 5.2:1 on --bg-primary */
-    --status-above-bg: rgba(14, 110, 102, 0.10);
-    --status-below: #9a5b00;    /* 4.8:1 on --bg-primary */
-    --status-below-bg: rgba(154, 91, 0, 0.11);
+    --status-above: #0b625a;    /* 6.6:1 on --bg-primary, 5.1:1 on its own tint */
+    --status-above-bg: rgba(11, 98, 90, 0.10);
+    --status-below: #7f4a00;    /* 6.3:1 on --bg-primary, 5.1:1 on its own tint */
+    --status-below-bg: rgba(127, 74, 0, 0.11);
     --status-at: var(--text-muted);
     --status-at-bg: rgba(92, 101, 112, 0.10);
 
     /* ── Charts: the same three hues, extended by lightness only ────── */
     --chart-1: #584a9b;
-    --chart-2: #0e6e66;
-    --chart-3: #9a5b00;
+    --chart-2: #0b625a;
+    --chart-3: #7f4a00;
     --chart-4: #8a7cc9;
     --chart-5: #3e9c92;
     --chart-6: #c9903d;
@@ -68,8 +68,8 @@
        moderate saturation, and every one clears AA on --bg-primary, so they
        read as one family and work as legend text as well as chart lines. */
     --series-1: #584a9b;
-    --series-2: #0e6e66;
-    --series-3: #9a5b00;
+    --series-2: #0b625a;
+    --series-3: #7f4a00;
     --series-4: #a03a5e;
     --series-5: #2f5f8f;
     --series-6: #4a6b2f;
@@ -93,6 +93,16 @@
     --phase-nursery-bg: rgba(122, 85, 96, 0.10);
     --phase-nursery-text: #64454f;
 
+    /* ── Sunken surface: the footer, and anything meant to read as a dark
+          anchor band. Deliberately NOT --surface-inverse: "inverse" flips
+          with the theme, which turned the footer into a light slab at the
+          bottom of a dark page. This stays dark in both. ──────────────── */
+    --surface-sunken: #16202a;
+    --on-sunken: #e4e2dc;
+    --on-sunken-muted: #b3b8bd;
+    --on-sunken-faint: #7f878f;
+    --on-sunken-link: #b9aeef;
+
     /* ── Medals: rankings podium. Metal, not palette — kept legible on
           both grounds rather than literally gold/silver/bronze. ───────── */
     --medal-gold: #a67c00;
@@ -104,8 +114,8 @@
        an arbitrary alpha reads the raw channels from here. Keep these in
        sync with the hex tokens above — they are the same colours. */
     --brand-rgb: 88, 74, 155;
-    --status-above-rgb: 14, 110, 102;
-    --status-below-rgb: 154, 91, 0;
+    --status-above-rgb: 11, 98, 90;
+    --status-below-rgb: 127, 74, 0;
     --ink-rgb: 22, 32, 42;
     --text-inverse-rgb: 247, 247, 244;
     --shadow-rgb: 22, 32, 42;
@@ -185,14 +195,14 @@
         --brand-bg: rgba(156, 140, 232, 0.14);
         --brand-on: #10151b;
 
-        --status-above: #3fb3a4;    /* 7.2:1 */
-        --status-above-bg: rgba(63, 179, 164, 0.14);
+        --status-above: #4fc0b0;    /* 8.4:1 on --bg-primary, 4.8:1 on its own tint */
+        --status-above-bg: rgba(79, 192, 176, 0.14);
         --status-below: #d99b2e;    /* 7.7:1 */
         --status-below-bg: rgba(217, 155, 46, 0.14);
         --status-at-bg: rgba(141, 153, 166, 0.14);
 
         --chart-1: #9c8ce8;
-        --chart-2: #3fb3a4;
+        --chart-2: #4fc0b0;
         --chart-3: #d99b2e;
         --chart-4: #6f5fc4;
         --chart-5: #2b8a7e;
@@ -201,7 +211,7 @@
         --chart-reference: #8d99a6;
 
         --series-1: #9c8ce8;
-        --series-2: #3fb3a4;
+        --series-2: #4fc0b0;
         --series-3: #d99b2e;
         --series-4: #e07a9d;
         --series-5: #6fa8dc;
@@ -225,12 +235,18 @@
         --phase-nursery-bg: rgba(191, 152, 163, 0.14);
         --phase-nursery-text: #d1aeb8;
 
+        --surface-sunken: #0a0e13;
+        --on-sunken: #d8dde2;
+        --on-sunken-muted: #9aa4ae;
+        --on-sunken-faint: #6d777f;
+        --on-sunken-link: #b0a3ee;
+
         --medal-gold: #d4a72c;
         --medal-silver: #a8b0bb;
         --medal-bronze: #c08552;
 
         --brand-rgb: 156, 140, 232;
-        --status-above-rgb: 63, 179, 164;
+        --status-above-rgb: 79, 192, 176;
         --status-below-rgb: 217, 155, 46;
         --ink-rgb: 228, 233, 238;
         --text-inverse-rgb: 16, 21, 27;
@@ -285,6 +301,10 @@ button {
 
 /* Every digit that could line up in a column does. This is a data product;
    proportional numerals in a results table read as amateur. */
+/* The interface is mostly figures, so tabular is the default here rather
+   than something each component has to remember. Running prose opts back out
+   below — proportional figures read better in a sentence. */
+.main,
 table,
 [data-numeric] {
     font-variant-numeric: tabular-nums;
@@ -293,6 +313,7 @@ table,
 /* Prose gets the serif; the interface never does. */
 .prose {
     font-family: var(--font-prose);
+    font-variant-numeric: normal;
     font-size: var(--step-0);
     line-height: 1.65;
 }

nextjs-app/components/Footer.module.css

@@ -1,6 +1,6 @@
 .footer {
-  background: var(--text-primary);
-  color: var(--bg-secondary);
+  background: var(--surface-sunken);
+  color: var(--on-sunken);
   margin-top: auto;
 }
 
@@ -27,7 +27,7 @@
   margin: 0;
   font-size: 1.25rem;
   font-weight: 700;
-  color: var(--bg-primary);
+  color: var(--on-sunken);
   font-family: var(--font-display);
 }
 
@@ -35,14 +35,14 @@
   margin: 0;
   font-size: 0.875rem;
   line-height: 1.6;
-  color: rgba(var(--text-inverse-rgb), 0.7);
+  color: var(--on-sunken-muted);
 }
 
 .sectionTitle {
   margin: 0;
   font-size: 0.875rem;
   font-weight: 600;
-  color: var(--status-below);
+  color: var(--on-sunken-muted);
   text-transform: uppercase;
   letter-spacing: 0.05em;
 }
@@ -58,24 +58,24 @@
 
 .link {
   font-size: 0.875rem;
-  color: rgba(var(--text-inverse-rgb), 0.7);
+  color: var(--on-sunken-muted);
   text-decoration: none;
   transition: color 0.2s ease;
 }
 
 .link:hover {
-  color: var(--status-below);
+  color: var(--on-sunken);
 }
 
 .linkDisabled {
   font-size: 0.875rem;
-  color: rgba(var(--text-inverse-rgb), 0.4);
+  color: var(--on-sunken-faint);
   cursor: not-allowed;
 }
 
 .bottom {
   padding-top: 2rem;
-  border-top: 1px solid rgba(var(--text-inverse-rgb), 0.15);
+  border-top: 1px solid rgba(255, 255, 255, 0.12);
   display: flex;
   flex-direction: column;
   gap: 0.5rem;
@@ -85,15 +85,15 @@
 .disclaimer {
   margin: 0;
   font-size: 0.875rem;
-  color: rgba(var(--text-inverse-rgb), 0.6);
+  color: var(--on-sunken-muted);
 }
 
 .disclaimer .link {
-  color: var(--brand);
+  color: var(--on-sunken-link);
 }
 
 .disclaimer .link:hover {
-  color: var(--status-below);
+  color: var(--on-sunken);
 }
 
 @media (max-width: 768px) {

nextjs-app/components/school/SchoolDetailShell.module.css

@@ -88,8 +88,7 @@
 
 
 .headerHasMap .actions .btnAdd {
-    /* Sits on the map hero, which renders light in both themes. */
-    background: rgba(255, 255, 255, 0.9);
+    background: var(--bg-card);
     color: var(--brand-strong);
     border-color: transparent;
     -webkit-backdrop-filter: blur(6px);

nextjs-app/components/school/schoolSections.module.css

@@ -75,8 +75,7 @@
 }
 
 .headerHasMap .actions .btnAdd {
-    /* Sits on the map hero, which renders light in both themes. */
-    background: rgba(255, 255, 255, 0.9);
+    background: var(--bg-card);
     color: var(--brand-strong);
     border-color: transparent;
     -webkit-backdrop-filter: blur(6px);