Fix the accessibility findings from the audit

Contrast: --mute-2 and --trash both failed AA in both themes — every
10px mono label (recent chapter, section headings, chapter hint) sat
between 2.5:1 and 3.7:1, and the trash icon, the one irreversible
control, was the least visible thing in the strip. Retuned per theme:
labels now 4.8-5.2:1, trash 4.3-4.5:1 against a 3:1 requirement.

Focus: the search input clears its own outline and the underline lives
on the parent, so :focus-within on .searchbar carries the ring.

The inline error slot gets role=status, so a failed write is announced
rather than looking like an ignored tap.

The tab strip drops role=tablist/tab: these are real links that change
the URL, and the roles promised a tabpanel contract that was never
implemented, leaving aria-selected unset on every one. aria-current
carries the state instead.

prefers-reduced-motion now names pseudo-elements — `*` does not match
them, so the busy bar and the error dot, both ::before, kept animating
for the users who asked them not to.

Log out was a 54x15 target; an ::after pad makes it 78x45 without
moving the label.

Also: the two dark-tuned hex borders in the desktop block become
theme-aware tokens, and the preload swaps mono for DM Sans, the larger
face and the one the body text needs.

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

backend/static/filter.js

@@ -20,8 +20,11 @@
 })();
 
 function setActiveTab(el) {
-  el.parentElement.querySelectorAll("[role=tab]").forEach(function (t) {
-    t.classList.toggle("active", t === el);
+  el.parentElement.querySelectorAll("a").forEach(function (t) {
+    var on = t === el;
+    t.classList.toggle("active", on);
+    if (on) t.setAttribute("aria-current", "page");
+    else t.removeAttribute("aria-current");
   });
 }
 

backend/static/style.css

@@ -64,7 +64,9 @@
   --paper-hot: #f0d3cb;    /* title of a series with a new chapter */
   --paper-dim: #ddd5cb;    /* resting title */
   --mute: #8d857c;         /* secondary text, idle icons */
-  --mute-2: #5a5450;       /* labels, hints */
+  /* Every mute-2 use is 10px mono, so it has to clear 4.5:1 on --ink even
+     though it reads as the quietest step. */
+  --mute-2: #877f76;       /* labels, hints */
   --faint: #3a3733;        /* meta separators */
   --faint-2: #57504b;      /* cover monogram */
 
@@ -73,7 +75,11 @@
   --ember-ink: #150907;    /* text on solid ember */
   --ember-soft: #eda798;   /* text on ember wash */
   --brass: #b8912f;        /* favourite — a second, cooler metal */
-  --trash: #6b5450;        /* remove, resting */
+  --trash: #977671;        /* remove, resting — icons need 3:1, not 4.5:1 */
+
+  /* Desktop cell borders for the two coloured action states. */
+  --play-hot-line: #3a1d18;
+  --fav-line: #332b14;
 
   --asura: #7d93a5;
   --demonic: #a98a78;
@@ -106,7 +112,7 @@
     --paper-hot: #a33018;
     --paper-dim: #191715;
     --mute: #6b645d;
-    --mute-2: #857d75;
+    --mute-2: #6c655e;   /* clears 4.5:1 on --ash too, not just --ink */
     --faint: #c9c2ba;
     --faint-2: #a8a098;
 
@@ -115,7 +121,10 @@
     --ember-ink: #fff;
     --ember-soft: #8d2c17;
     --brass: #8a681c;
-    --trash: #a98276;
+    --trash: #8c6558;
+
+    --play-hot-line: #f0cfc6;
+    --fav-line: #e3d3a4;
 
     --asura: #4f6b80;
     --demonic: #8a6a55;
@@ -180,6 +189,7 @@ button { cursor: pointer; }
 .topbar form { margin: 0; }
 
 .ghost {
+  position: relative;
   padding: 0;
   border: none;
   border-bottom: 1px solid var(--field-line);
@@ -190,6 +200,8 @@ button { cursor: pointer; }
   text-transform: uppercase;
 }
 .ghost:hover { color: var(--paper); border-bottom-color: var(--paper); }
+/* The label is 15px tall by design; the thumb gets 44 without moving it. */
+.ghost::after { content: ""; position: absolute; inset: -15px -12px; }
 
 .chrome { display: flex; flex-direction: column; }
 
@@ -202,6 +214,9 @@ button { cursor: pointer; }
   border-bottom: 1px solid var(--rule);
   color: var(--mute-2);
 }
+/* The input drops its own outline, so the bar it sits in carries the focus
+   ring — same move the two other inputs make with their border. */
+.searchbar:focus-within { border-bottom-color: var(--paper); color: var(--paper); }
 .searchbar svg { width: 15px; height: 15px; flex: none; }
 .search {
   flex: 1;
@@ -226,7 +241,7 @@ button { cursor: pointer; }
   border-bottom: 1px solid var(--rule);
 }
 .tabs::-webkit-scrollbar { display: none; }
-.tabs [role="tab"] {
+.tabs a {
   flex: none;
   display: flex;
   align-items: center;
@@ -236,8 +251,8 @@ button { cursor: pointer; }
   font: 400 17px var(--font-display);
   white-space: nowrap;
 }
-.tabs [role="tab"]:hover { color: var(--paper-dim); }
-.tabs [role="tab"].active {
+.tabs a:hover { color: var(--paper-dim); }
+.tabs a.active {
   color: var(--paper);
   border-bottom: 2px solid var(--paper);
   margin-bottom: -1px;
@@ -661,7 +676,7 @@ button { cursor: pointer; }
     border-bottom: 1px solid var(--rule);
   }
   .tabs { order: 1; flex: none; gap: 20px; padding: 0; border-bottom: none; }
-  .tabs [role="tab"] { padding: 10px 0 14px; font-size: 18px; }
+  .tabs a { padding: 10px 0 14px; font-size: 18px; }
   .searchbar { order: 2; flex: 1; margin: 0; border-bottom: none; }
   .recent h2, .recent-strip { padding-left: 32px; padding-right: 32px; }
   .recent-card, .recent-cover { width: 100px; }
@@ -683,8 +698,8 @@ button { cursor: pointer; }
      than by the hairline the phone layout uses. */
   .actions > .play + *,
   .actions > *:not(.lifecycle) + .lifecycle { margin-left: 10px; box-shadow: none; }
-  .is-new .actions .play { border-color: #3a1d18; }
-  .actions .on { border-color: #332b14; }
+  .is-new .actions .play { border-color: var(--play-hot-line); }
+  .actions .on { border-color: var(--fav-line); }
 
   /* Panels line up with the body text, i.e. past the cover and its gap. */
   .chapter-form, .confirm-row, .error-inline {
@@ -693,5 +708,8 @@ button { cursor: pointer; }
 }
 
 @media (prefers-reduced-motion: reduce) {
-  * { animation: none !important; transition: none !important; }
+  /* Pseudo-elements need naming explicitly — `*` does not match them, and the
+     busy bar and error dot are both ::before. Their static form still reads:
+     the bar stays drawn and .actions stays dimmed. */
+  *, *::before, *::after { animation: none !important; transition: none !important; }
 }