diff --git a/apps/web/src/m3-theme.spec.ts b/apps/web/src/m3-theme.spec.ts
new file mode 100644
index 000000000..bdacc25f6
--- /dev/null
+++ b/apps/web/src/m3-theme.spec.ts
@@ -0,0 +1,53 @@
+import { readFileSync } from 'node:fs';
+import { resolve } from 'node:path';
+
+// A custom property that reads another one is resolved where it is declared,
+// so a token derived from a per-theme colour has to be declared again inside
+// `.dark-theme`; inherited from `html`, it would keep the light value there.
+const THEME = readFileSync(
+    resolve(process.cwd(), 'apps/web/src/m3-theme.scss'),
+    'utf8'
+)
+    .replace(/\/\*[\s\S]*?\*\//g, '')
+    .replace(/(^|\s)\/\/[^\n]*/g, '$1');
+
+/** The body of the brace block that opens at `start` (an index of `{`). */
+function block(source: string, start: number): string {
+    let depth = 0;
+    for (let index = start; index < source.length; index++) {
+        if (source[index] === '{') depth++;
+        if (source[index] === '}' && --depth === 0) {
+            return source.slice(start + 1, index);
+        }
+    }
+    throw new Error('Unbalanced braces in m3-theme.scss');
+}
+
+/** Light declarations (the `html` block minus `.dark-theme`) and dark ones. */
+function themeContexts(): { light: string; dark: string } {
+    const darkStart = THEME.indexOf('.dark-theme {');
+    const htmlStart = THEME.lastIndexOf('html {', darkStart);
+    expect(darkStart).toBeGreaterThan(-1);
+    expect(htmlStart).toBeGreaterThan(-1);
+
+    const html = block(THEME, THEME.indexOf('{', htmlStart));
+    const dark = block(THEME, THEME.indexOf('{', darkStart));
+    return { light: html.replace(dark, ''), dark };
+}
+
+describe('m3-theme watch-progress token', () => {
+    it('declares --app-progress-color from the selection colour in both themes', () => {
+        const { light, dark } = themeContexts();
+        const progress =
+            /--app-progress-color:\s*var\(--app-selection-color\);/;
+        const selection = /--app-selection-color:\s*#[0-9a-f]{6};/i;
+
+        for (const context of [light, dark]) {
+            expect(context).toMatch(selection);
+            expect(context).toMatch(progress);
+        }
+        expect(light.match(selection)?.[0]).not.toBe(
+            dark.match(selection)?.[0]
+        );
+    });
+});
diff --git a/docs/architecture/iptvnator-ui-guidelines.md b/docs/architecture/iptvnator-ui-guidelines.md
index 488066df5..14aeee560 100644
--- a/docs/architecture/iptvnator-ui-guidelines.md
+++ b/docs/architecture/iptvnator-ui-guidelines.md
@@ -531,10 +531,12 @@ A title's watch progress (its resume share, `progressPercent`) has exactly one
 colour per context, and never a literal of its own:
 
 - **App chrome** — dashboard rail cards and the hero, catalog grids and season
-  episodes (`app-progress-capsule`): `--app-progress-color`, declared per theme
-  in `apps/web/src/m3-theme.scss` as that theme's `--app-selection-color`. The
-  capsule's green from 90 % marks a finished title; it is a status, not
-  progress.
+  episodes (`app-progress-capsule`, and the season list rows' own fill):
+  `--app-progress-color`, declared per theme in `apps/web/src/m3-theme.scss`
+  as that theme's `--app-selection-color`, and declared again inside
+  `.dark-theme` because a derived custom property resolves where it is
+  declared. The capsule's green from 90 % marks a finished title; it is a
+  status, not progress.
 - **Over video** — the dock timeline, the Up next card, the Up Next rail and
   the fullscreen episode panel: the player's fixed `--pc-progress` (accent
   blue `#4f8eff`), never an app token, because the player palette is
@@ -550,8 +552,10 @@ colour per context, and never a literal of its own:
   live hero slides) keeps `--app-live-color`; EPG programme progress keeps the
   fill described below.
 
-Specs hold the rule in each owning project: `player-progress.palette.spec.ts`
-(ui-playback), `progress-capsule.component.spec.ts` (components) and
+Specs hold the rule in each owning project: `m3-theme.spec.ts` (web: the token
+in both theme contexts), `player-progress.palette.spec.ts` (ui-playback),
+`progress-capsule.component.spec.ts` and
+`season-container.progress-colour.spec.ts` (components) and
 `dashboard-progress-colour.spec.ts` (workspace-dashboard-feature).
 
 ### Track
diff --git a/libs/ui/components/src/lib/season-container/season-container.component.scss b/libs/ui/components/src/lib/season-container/season-container.component.scss
index ac8c8df6a..3ea92289a 100644
--- a/libs/ui/components/src/lib/season-container/season-container.component.scss
+++ b/libs/ui/components/src/lib/season-container/season-container.component.scss
@@ -671,7 +671,7 @@ app-season-tabs {
 
     &__progress-fill {
         height: 100%;
-        background: var(--mat-sys-primary);
+        background: var(--app-progress-color);
         border-radius: 2px;
         transition: width 0.3s ease;
     }
diff --git a/libs/ui/components/src/lib/season-container/season-container.progress-colour.spec.ts b/libs/ui/components/src/lib/season-container/season-container.progress-colour.spec.ts
new file mode 100644
index 000000000..a8728c0dd
--- /dev/null
+++ b/libs/ui/components/src/lib/season-container/season-container.progress-colour.spec.ts
@@ -0,0 +1,27 @@
+import { readFileSync } from 'node:fs';
+import { resolve } from 'node:path';
+
+// Watch progress in app chrome reads one theme token in both season view
+// modes; the list rows draw their own fill rather than the grid's capsule
+// (see the UI guidelines' Progress Bars section).
+const DIR = resolve(
+    process.cwd(),
+    'libs/ui/components/src/lib/season-container'
+);
+
+function read(file: string): string {
+    return readFileSync(resolve(DIR, file), 'utf8');
+}
+
+describe('season container watch-progress colour', () => {
+    it('fills list rows with the app watch-progress token', () => {
+        const styles = read('season-container.component.scss');
+        const listItem = styles.slice(styles.indexOf('.episode-list-item {'));
+        const fill = listItem.match(/&__progress-fill\s*\{([^}]*)\}/)?.[1];
+
+        expect(read('season-container.component.html')).toContain(
+            'class="episode-list-item__progress-fill"'
+        );
+        expect(fill).toMatch(/background:\s*var\(--app-progress-color\);/);
+    });
+});