feat(appearance): accent color, corners, wide layout and game art background

public/i18n/de.json

@@ -64,7 +64,28 @@
     "PUBLIC_PROFILE_HINT": "Jeder mit dem Link sieht deine Statistik, was du gerade spielst und deine durchgespielten Spiele mit Bewertung. Notizen, E-Mail und Steam-ID bleiben privat.",
     "PUBLIC_PROFILE_NEEDS_NAME": "Lege zuerst einen Anzeigenamen fest; er wird Teil des Links.",
     "PUBLIC_PROFILE_COPY": "Link kopieren",
-    "PUBLIC_PROFILE_COPIED": "Link kopiert"
+    "PUBLIC_PROFILE_COPIED": "Link kopiert",
+    "APPEARANCE": "Aussehen",
+    "ACCENT": "Akzentfarbe",
+    "ACCENT_OPTIONS": {
+      "VIOLET": "Violett",
+      "BLUE": "Blau",
+      "GREEN": "Grün",
+      "ORANGE": "Orange",
+      "PINK": "Pink",
+      "RED": "Rot"
+    },
+    "CORNERS": "Ecken",
+    "CORNER_OPTIONS": {
+      "SHARP": "Eckig",
+      "DEFAULT": "Normal",
+      "ROUND": "Rund"
+    },
+    "WIDE_LAYOUT": "Breites Layout",
+    "WIDE_LAYOUT_HINT": "Nutzt mehr Platz auf breiten Bildschirmen.",
+    "BACKGROUND": "Hintergrund",
+    "BACKGROUND_HINT": "Öffne ein Spiel in deiner Bibliothek und wähle „Als Hintergrund“.",
+    "BACKGROUND_REMOVE": "Hintergrund entfernen"
   },
   "VALIDATION": {
     "EMAIL_REQUIRED": "Email ist erforderlich.",
@@ -158,7 +179,9 @@
     "TTB": "Spieldauer laut IGDB",
     "TTB_HASTILY": "Story",
     "TTB_NORMALLY": "+ Extras",
-    "TTB_COMPLETELY": "100 %"
+    "TTB_COMPLETELY": "100 %",
+    "SET_BACKGROUND": "Als Hintergrund",
+    "REMOVE_BACKGROUND": "Hintergrund entfernen"
   },
   "LANDING": {
     "STATS_TITLE": "Community-Statistiken",

public/i18n/en.json

@@ -64,7 +64,28 @@
     "PUBLIC_PROFILE_HINT": "Anyone with the link sees your stats, what you play right now and your finished games with ratings. Notes, email and Steam ID stay private.",
     "PUBLIC_PROFILE_NEEDS_NAME": "Set a display name first; it becomes part of the link.",
     "PUBLIC_PROFILE_COPY": "Copy link",
-    "PUBLIC_PROFILE_COPIED": "Link copied"
+    "PUBLIC_PROFILE_COPIED": "Link copied",
+    "APPEARANCE": "Appearance",
+    "ACCENT": "Accent color",
+    "ACCENT_OPTIONS": {
+      "VIOLET": "Violet",
+      "BLUE": "Blue",
+      "GREEN": "Green",
+      "ORANGE": "Orange",
+      "PINK": "Pink",
+      "RED": "Red"
+    },
+    "CORNERS": "Corners",
+    "CORNER_OPTIONS": {
+      "SHARP": "Sharp",
+      "DEFAULT": "Normal",
+      "ROUND": "Round"
+    },
+    "WIDE_LAYOUT": "Wide layout",
+    "WIDE_LAYOUT_HINT": "Uses more of a wide screen.",
+    "BACKGROUND": "Background",
+    "BACKGROUND_HINT": "Open a game in your library and choose \"Use as background\".",
+    "BACKGROUND_REMOVE": "Remove background"
   },
   "VALIDATION": {
     "EMAIL_REQUIRED": "Email is required.",
@@ -158,7 +179,9 @@
     "TTB": "Time to beat (IGDB)",
     "TTB_HASTILY": "Story",
     "TTB_NORMALLY": "+ Extras",
-    "TTB_COMPLETELY": "100%"
+    "TTB_COMPLETELY": "100%",
+    "SET_BACKGROUND": "Use as background",
+    "REMOVE_BACKGROUND": "Remove background"
   },
   "LANDING": {
     "STATS_TITLE": "Community stats",

src/App.jsx

@@ -15,10 +15,13 @@ import PublicProfilePage from './pages/PublicProfilePage.jsx';
 import AppHeader from './components/AppHeader.jsx';
 import {Toaster} from '@/components/ui/sonner';
 import {TooltipProvider} from '@/components/ui/tooltip';
+import PageBackground from './components/PageBackground.jsx';
+import {usePreferences} from './context/PreferencesContext.jsx';
 
 function App() {
     const {t} = useTranslation();
     const [isAuthenticated, setIsAuthenticated] = useState(false);
+    const {appearance, syncAppearance, resetAppearance} = usePreferences();
 
     // Hooks for routing
     const navigate = useNavigate();
@@ -30,15 +33,23 @@ function App() {
         setIsAuthenticated(!!localStorage.getItem('tbp_jwt'));
     }, [location]);
 
+    // On login and on page load; the cached look shows until Auth answers.
+    useEffect(() => {
+        if (isAuthenticated) syncAppearance();
+    }, [isAuthenticated, syncAppearance]);
+
     const handleLogout = () => {
         localStorage.removeItem('tbp_jwt');
+        resetAppearance();
         setIsAuthenticated(false);
         navigate('/login');
     };
 
     return (
         <TooltipProvider>
-            <div className="min-h-screen flex flex-col bg-background text-foreground font-sans">
+            {/* isolate: the background layer sits behind the content but in front of this div's own background. */}
+            <div className="isolate min-h-screen flex flex-col bg-background text-foreground font-sans">
+                {isAuthenticated && <PageBackground key={appearance.backgroundAppid} appid={appearance.backgroundAppid}/>}
                 <AppHeader isAuthenticated={isAuthenticated} onLogout={handleLogout}/>
 
                 <main className="grow flex flex-col">

src/components/AppHeader.jsx

@@ -12,6 +12,7 @@ import {
 } from '@/components/ui/dropdown-menu';
 import {usePreferences} from '@/context/PreferencesContext.jsx';
 import {cn} from '@/lib/utils';
+import PageContainer from './PageContainer.jsx';
 
 const NAV_ITEMS = [
     {to: '/dashboard', labelKey: 'NAV.DASHBOARD', Icon: LayoutDashboard},
@@ -37,7 +38,7 @@ export default function AppHeader({isAuthenticated, onLogout}) {
 
     return (
         <header className="sticky top-0 z-50 border-b bg-background/80 backdrop-blur supports-[backdrop-filter]:bg-background/60">
-            <div className="mx-auto flex h-16 max-w-5xl items-center gap-2 px-4 md:px-8">
+            <PageContainer className="flex h-16 items-center gap-2 px-4 md:px-8">
                 <Link to={isAuthenticated ? '/dashboard' : '/'} className="mr-2 flex items-center gap-2 font-bold tracking-tight whitespace-nowrap">
                     <span className="flex size-8 items-center justify-center rounded-lg bg-primary text-primary-foreground">
                         <Gamepad2 className="size-5"/>
@@ -95,7 +96,7 @@ export default function AppHeader({isAuthenticated, onLogout}) {
                         </>
                     )}
                 </div>
-            </div>
+            </PageContainer>
         </header>
     );
 }

src/components/PageBackground.jsx

@@ -0,0 +1,21 @@
+import {useState} from 'react';
+import {coverUrl, heroUrl} from '../utils/games.js';
+
+/**
+ * Game art behind the whole page, blurred and dimmed so text on it stays readable. Falls back to the store
+ * header for apps without library art. Give it `key={appid}`, so a new game starts with its library art again.
+ */
+export default function PageBackground({appid}) {
+    const [failures, setFailures] = useState(0);
+
+    if (!appid || failures > 1) return null;
+
+    return (
+        <div aria-hidden="true" className="pointer-events-none fixed inset-0 -z-10 overflow-hidden">
+            <img src={failures === 0 ? heroUrl(appid) : coverUrl(appid)} alt=""
+                 onError={() => setFailures((count) => count + 1)}
+                 className="size-full scale-110 object-cover blur-md"/>
+            <div className="absolute inset-0 bg-background/80"/>
+        </div>
+    );
+}

src/components/PageBackground.test.jsx

@@ -0,0 +1,26 @@
+// @vitest-environment jsdom
+import {afterEach, describe, expect, it} from 'vitest';
+import {cleanup, fireEvent, render} from '@testing-library/react';
+import PageBackground from './PageBackground.jsx';
+
+afterEach(cleanup);
+
+describe('PageBackground', () => {
+    it('shows nothing without a game', () => {
+        const {container} = render(<PageBackground appid={null}/>);
+
+        expect(container.innerHTML).toBe('');
+    });
+
+    it('shows the library art, then the store header, then nothing', () => {
+        const {container} = render(<PageBackground appid={620}/>);
+        const img = () => container.querySelector('img');
+        expect(img().getAttribute('src')).toContain('/620/library_hero.jpg');
+
+        fireEvent.error(img());
+        expect(img().getAttribute('src')).toContain('/620/header.jpg');
+
+        fireEvent.error(img());
+        expect(container.innerHTML).toBe('');
+    });
+});

src/components/PageContainer.jsx

@@ -0,0 +1,14 @@
+import {cn} from '@/lib/utils';
+import {usePreferences} from '../context/PreferencesContext.jsx';
+
+/**
+ * The centered page column. Its width follows the wide layout setting.
+ */
+export default function PageContainer({className, children}) {
+    const {appearance} = usePreferences();
+    return (
+        <div className={cn('w-full mx-auto', appearance.wideLayout ? 'max-w-7xl' : 'max-w-5xl', className)}>
+            {children}
+        </div>
+    );
+}

src/components/PageContainer.test.jsx

@@ -0,0 +1,31 @@
+// @vitest-environment jsdom
+import {afterEach, describe, expect, it, vi} from 'vitest';
+import {cleanup, render} from '@testing-library/react';
+import {PreferencesProvider} from '../context/PreferencesContext.jsx';
+import PageContainer from './PageContainer.jsx';
+
+vi.mock('react-i18next', () => import('../test/i18n-mock.js'));
+
+afterEach(() => {
+    cleanup();
+    localStorage.clear();
+});
+
+const renderContainer = () => render(
+    <PreferencesProvider><PageContainer className="p-4">content</PageContainer></PreferencesProvider>,
+).container.firstChild;
+
+describe('PageContainer', () => {
+    it('is the normal column by default', () => {
+        expect(renderContainer().className).toContain('max-w-5xl');
+    });
+
+    it('is wider with the wide layout', () => {
+        localStorage.setItem('tbp_appearance', JSON.stringify({wideLayout: true}));
+
+        const container = renderContainer();
+
+        expect(container.className).toContain('max-w-7xl');
+        expect(container.className).toContain('p-4');
+    });
+});

src/context/PreferencesContext.jsx

@@ -1,5 +1,14 @@
-import {createContext, useContext, useEffect, useState} from 'react';
+import {createContext, useCallback, useContext, useEffect, useLayoutEffect, useRef, useState} from 'react';
 import {useTranslation} from 'react-i18next';
+import {
+    applyAppearance,
+    cacheAppearance,
+    DEFAULT_APPEARANCE,
+    loadAppearance,
+    normalizeAppearance,
+    readCachedAppearance,
+    saveAppearance,
+} from '../utils/appearance.js';
 
 const DARK_MODE_STORAGE_KEY = 'tbp_dark_mode';
 
@@ -22,6 +31,85 @@ export function PreferencesProvider({children}) {
         localStorage.setItem(DARK_MODE_STORAGE_KEY, String(isDarkMode));
     }, [isDarkMode]);
 
+    const [appearance, setAppearanceState] = useState(readCachedAppearance);
+    // What Auth has, as far as this tab knows. A save sends it plus the pending changes, never a stale full look.
+    const savedAppearance = useRef(appearance);
+    // Changed here but not yet saved; a load from Auth keeps them.
+    const pendingChanges = useRef({});
+    const syncing = useRef(Promise.resolve());
+    const saving = useRef(Promise.resolve());
+    // Grows on reset, so a load or save that started for the user before does not come back.
+    const generation = useRef(0);
+
+    // Layout effect: the cached look is set before the first paint.
+    useLayoutEffect(() => {
+        applyAppearance(appearance);
+        cacheAppearance(appearance);
+    }, [appearance]);
+
+    const syncAppearance = useCallback(() => {
+        const started = generation.current;
+        syncing.current = (async () => {
+            try {
+                const loaded = await loadAppearance();
+                if (loaded && generation.current === started) {
+                    savedAppearance.current = loaded;
+                    setAppearanceState(normalizeAppearance({...loaded, ...pendingChanges.current}));
+                }
+            } catch (err) {
+                console.error('Appearance load error:', err);
+            }
+        })();
+        return syncing.current;
+    }, []);
+
+    /**
+     * Applies the changed fields at once, then saves them to Auth after a running load and after the saves before
+     * it, one at a time, so answers cannot arrive out of order. On a failed save it puts back the fields that still
+     * hold this change, so a later change is kept.
+     *
+     * @return the fetch response, or null when a reset came first and nothing was sent; throws on a network error
+     */
+    const changeAppearance = useCallback((changes) => {
+        const started = generation.current;
+        pendingChanges.current = {...pendingChanges.current, ...changes};
+        setAppearanceState((current) => normalizeAppearance({...current, ...changes}));
+
+        const save = async () => {
+            await syncing.current;
+            if (generation.current !== started) return null;
+
+            const body = normalizeAppearance({...savedAppearance.current, ...pendingChanges.current});
+            let response = null;
+            try {
+                response = await saveAppearance(body);
+                return response;
+            } finally {
+                if (generation.current === started) {
+                    const ok = !!response?.ok;
+                    if (ok) savedAppearance.current = body;
+                    const own = Object.keys(changes).filter((field) => pendingChanges.current[field] === changes[field]);
+                    own.forEach((field) => delete pendingChanges.current[field]);
+                    if (!ok && own.length) {
+                        setAppearanceState((current) => normalizeAppearance({
+                            ...current, ...Object.fromEntries(own.map((field) => [field, savedAppearance.current[field]])),
+                        }));
+                    }
+                }
+            }
+        };
+        const result = saving.current.then(save, save);
+        saving.current = result.catch(() => {});
+        return result;
+    }, []);
+
+    const resetAppearance = useCallback(() => {
+        generation.current += 1;
+        pendingChanges.current = {};
+        savedAppearance.current = DEFAULT_APPEARANCE;
+        setAppearanceState(DEFAULT_APPEARANCE);
+    }, []);
+
     const setLanguage = (lang) => i18n.changeLanguage(lang);
 
     return (
@@ -31,6 +119,10 @@ export function PreferencesProvider({children}) {
                 setDarkMode: setIsDarkMode,
                 language: i18n.language,
                 setLanguage,
+                appearance,
+                changeAppearance,
+                syncAppearance,
+                resetAppearance,
             }}
         >
             {children}
@@ -45,3 +137,12 @@ export function usePreferences() {
     }
     return ctx;
 }
+
+/**
+ * resetAppearance, or a no-op outside a PreferencesProvider, so hooks used in bare component tests keep working.
+ */
+export function useResetAppearance() {
+    return useContext(PreferencesContext)?.resetAppearance ?? noop;
+}
+
+const noop = () => {};

src/hooks/useSaveAppearance.js

@@ -0,0 +1,35 @@
+import {useCallback} from 'react';
+import {useTranslation} from 'react-i18next';
+import {toast} from 'sonner';
+import {usePreferences} from '../context/PreferencesContext.jsx';
+import useSessionExpired from './useSessionExpired.js';
+
+/**
+ * Returns `save(changes)`: changeAppearance plus the error messages and the session end on a 401. Resolves to
+ * true when saved.
+ */
+export default function useSaveAppearance() {
+    const {t} = useTranslation();
+    const {changeAppearance} = usePreferences();
+    const expireSession = useSessionExpired();
+
+    return useCallback(async (changes) => {
+        try {
+            const response = await changeAppearance(changes);
+            if (!response) return false;
+            if (response.status === 401) {
+                expireSession();
+                return false;
+            }
+            if (!response.ok) {
+                toast.error(t('SETTINGS.ERROR_SAVE'));
+                return false;
+            }
+            return true;
+        } catch (err) {
+            console.error('Appearance save error:', err);
+            toast.error(t('INFO.ERROR.NETWORK_FAILURE'));
+            return false;
+        }
+    }, [changeAppearance, expireSession, t]);
+}

src/hooks/useSaveAppearance.test.jsx

@@ -0,0 +1,227 @@
+// @vitest-environment jsdom
+import {afterEach, beforeEach, describe, expect, it, vi} from 'vitest';
+import {act, cleanup, renderHook} from '@testing-library/react';
+import {MemoryRouter} from 'react-router-dom';
+import {toast} from 'sonner';
+import {PreferencesProvider, usePreferences} from '../context/PreferencesContext.jsx';
+import useSaveAppearance from './useSaveAppearance.js';
+import {DEFAULT_APPEARANCE} from '../utils/appearance.js';
+
+vi.mock('react-i18next', () => import('../test/i18n-mock.js'));
+vi.mock('sonner', () => ({toast: {success: vi.fn(), error: vi.fn()}}));
+
+const wrapper = ({children}) => (
+    <MemoryRouter><PreferencesProvider>{children}</PreferencesProvider></MemoryRouter>
+);
+
+const renderSave = () => renderHook(() => ({save: useSaveAppearance(), preferences: usePreferences()}), {wrapper});
+
+beforeEach(() => {
+    localStorage.setItem('tbp_jwt', 'token');
+});
+
+afterEach(() => {
+    cleanup();
+    localStorage.clear();
+    vi.clearAllMocks();
+});
+
+describe('useSaveAppearance', () => {
+    it('applies the change at once and sends the whole appearance', async () => {
+        globalThis.fetch = vi.fn(async () => ({ok: true, status: 204}));
+        const {result} = renderSave();
+
+        let saved;
+        await act(async () => {
+            saved = await result.current.save({accent: 'blue'});
+        });
+
+        expect(saved).toBe(true);
+        expect(result.current.preferences.appearance.accent).toBe('blue');
+        expect(document.documentElement.dataset.accent).toBe('blue');
+        const [url, request] = fetch.mock.calls[0];
+        expect(url).toContain('/api/users/settings/appearance');
+        expect(request.method).toBe('PUT');
+        expect(JSON.parse(request.body)).toEqual({accent: 'blue', corners: 'default', wideLayout: false, backgroundAppid: null});
+    });
+
+    it('puts the old value back when Auth refuses', async () => {
+        globalThis.fetch = vi.fn(async () => ({ok: false, status: 400}));
+        const {result} = renderSave();
+
+        await act(async () => {
+            await result.current.save({corners: 'round'});
+        });
+
+        expect(result.current.preferences.appearance.corners).toBe('default');
+        expect(toast.error).toHaveBeenCalledWith('SETTINGS.ERROR_SAVE');
+    });
+
+    it('keeps a later change when an earlier save fails', async () => {
+        let failFirst;
+        globalThis.fetch = vi.fn()
+            .mockImplementationOnce(() => new Promise((resolve) => {
+                failFirst = () => resolve({ok: false, status: 500});
+            }))
+            .mockImplementation(async () => ({ok: true, status: 204}));
+        const {result} = renderSave();
+
+        let first;
+        let second;
+        await act(async () => {
+            first = result.current.save({accent: 'green'});
+        });
+        await act(async () => {
+            second = result.current.save({accent: 'pink'});
+        });
+        await act(async () => {
+            failFirst();
+            await first;
+            await second;
+        });
+
+        expect(result.current.preferences.appearance.accent).toBe('pink');
+        expect(JSON.parse(fetch.mock.calls[1][1].body).accent).toBe('pink');
+    });
+
+    it('ends the session on a 401', async () => {
+        globalThis.fetch = vi.fn(async () => ({ok: false, status: 401}));
+        const {result} = renderSave();
+
+        await act(async () => {
+            await result.current.save({wideLayout: true});
+        });
+
+        expect(localStorage.getItem('tbp_jwt')).toBeNull();
+    });
+
+    it('ends the session with the default look on a 401, so the next user does not get this one', async () => {
+        localStorage.setItem('tbp_appearance', JSON.stringify({accent: 'green', corners: 'round', wideLayout: true, backgroundAppid: 620}));
+        globalThis.fetch = vi.fn(async () => ({ok: false, status: 401}));
+        const {result} = renderSave();
+
+        await act(async () => {
+            await result.current.save({corners: 'sharp'});
+        });
+
+        expect(result.current.preferences.appearance).toEqual(DEFAULT_APPEARANCE);
+        expect(JSON.parse(localStorage.getItem('tbp_appearance'))).toEqual(DEFAULT_APPEARANCE);
+    });
+
+    it('waits for a running load from Auth, then keeps its values for the fields not changed here', async () => {
+        const fromServer = {accent: 'green', corners: 'default', wideLayout: false, backgroundAppid: null};
+        let answerMe;
+        globalThis.fetch = vi.fn((url, init) => (init?.method === 'PUT'
+            ? Promise.resolve({ok: true, status: 204})
+            : new Promise((resolve) => {
+                answerMe = () => resolve({ok: true, status: 200, json: async () => ({settings: {appearance: fromServer}})});
+            })));
+        const {result} = renderSave();
+
+        let sync;
+        let save;
+        act(() => {
+            sync = result.current.preferences.syncAppearance();
+        });
+        act(() => {
+            save = result.current.save({corners: 'round'});
+        });
+        expect(result.current.preferences.appearance.corners).toBe('round');
+        expect(fetch.mock.calls.some(([, init]) => init?.method === 'PUT')).toBe(false);
+
+        await act(async () => {
+            answerMe();
+            await sync;
+            await save;
+        });
+
+        expect(result.current.preferences.appearance).toEqual({...fromServer, corners: 'round'});
+        const [, put] = fetch.mock.calls.find(([, init]) => init?.method === 'PUT');
+        expect(JSON.parse(put.body)).toEqual({...fromServer, corners: 'round'});
+    });
+
+    it('does not bring back the look of the user before after a reset', async () => {
+        let answerMe;
+        globalThis.fetch = vi.fn(() => new Promise((resolve) => {
+            answerMe = () => resolve({ok: true, status: 200, json: async () => ({settings: {appearance: {accent: 'red', corners: 'sharp'}}})});
+        }));
+        const {result} = renderSave();
+
+        let sync;
+        act(() => {
+            sync = result.current.preferences.syncAppearance();
+        });
+        act(() => result.current.preferences.resetAppearance());
+        await act(async () => {
+            answerMe();
+            await sync;
+        });
+
+        expect(result.current.preferences.appearance).toEqual(DEFAULT_APPEARANCE);
+    });
+
+    it('sends saves one at a time, so a later save never carries an older value', async () => {
+        const answers = [];
+        globalThis.fetch = vi.fn((url, init) => (init?.method === 'PUT'
+            ? new Promise((resolve) => answers.push(() => resolve({ok: true, status: 204})))
+            : Promise.resolve({ok: true, status: 200, json: async () => ({})})));
+        const puts = () => fetch.mock.calls.filter(([, init]) => init?.method === 'PUT').map(([, init]) => JSON.parse(init.body));
+        const {result} = renderSave();
+
+        let first;
+        let second;
+        await act(async () => {
+            first = result.current.save({accent: 'green'});
+        });
+        await act(async () => {
+            second = result.current.save({corners: 'round'});
+        });
+        expect(puts()).toHaveLength(1);
+
+        await act(async () => {
+            answers[0]();
+            await first;
+        });
+        await act(async () => {
+            answers[1]();
+            await second;
+        });
+        let third;
+        await act(async () => {
+            third = result.current.save({wideLayout: true});
+        });
+        await act(async () => {
+            answers[2]();
+            await third;
+        });
+
+        expect(result.current.preferences.appearance.corners).toBe('round');
+        expect(puts()[2]).toEqual({accent: 'green', corners: 'round', wideLayout: true, backgroundAppid: null});
+    });
+
+    it('sends nothing for a change that waited for the load when a reset came first', async () => {
+        let answerMe;
+        globalThis.fetch = vi.fn((url, init) => (init?.method === 'PUT'
+            ? Promise.resolve({ok: true, status: 204})
+            : new Promise((resolve) => {
+                answerMe = () => resolve({ok: true, status: 200, json: async () => ({})});
+            })));
+        const {result} = renderSave();
+
+        act(() => {
+            result.current.preferences.syncAppearance();
+        });
+        let save;
+        act(() => {
+            save = result.current.save({accent: 'green'});
+        });
+        act(() => result.current.preferences.resetAppearance());
+        await act(async () => {
+            answerMe();
+            await save;
+        });
+
+        expect(fetch.mock.calls.some(([, init]) => init?.method === 'PUT')).toBe(false);
+        expect(result.current.preferences.appearance).toEqual(DEFAULT_APPEARANCE);
+    });
+});

src/hooks/useSessionExpired.js

@@ -1,13 +1,15 @@
 import {useCallback, useRef} from 'react';
 import {useLocation, useNavigate} from 'react-router-dom';
+import {useResetAppearance} from '../context/PreferencesContext.jsx';
 
 /**
- * Returns a function for a 401 answer: it removes the token and opens the login page, which then says that
- * the session expired and comes back to the current page after login. The function is as stable as
- * `navigate`, so an effect that lists `navigate` can list it too.
+ * Returns a function for a 401 answer: it removes the token and the user's look and opens the login page, which
+ * then says that the session expired and comes back to the current page after login. The function is as stable
+ * as `navigate`, so an effect that lists `navigate` can list it too.
  */
 export default function useSessionExpired() {
     const navigate = useNavigate();
+    const resetAppearance = useResetAppearance();
     const location = useLocation();
     const locationRef = useRef(location);
     locationRef.current = location;
@@ -15,6 +17,7 @@ export default function useSessionExpired() {
     return useCallback(() => {
         const {pathname, search} = locationRef.current;
         localStorage.removeItem('tbp_jwt');
+        resetAppearance();
         navigate('/login', {replace: true, state: {sessionExpired: true, from: pathname + search}});
-    }, [navigate]);
+    }, [navigate, resetAppearance]);
 }

src/pages/Dashboard.jsx

@@ -18,6 +18,7 @@ import useLibrarySync from '../hooks/useLibrarySync.js';
 import useForceSync from '../hooks/useForceSync.js';
 import {formatPlaytime} from '../utils/games.js';
 import useSessionExpired from '../hooks/useSessionExpired.js';
+import PageContainer from '../components/PageContainer.jsx';
 
 const TOP_GAMES = 5;
 // The games endpoint accepts only the page sizes 20, 40 and 80.
@@ -208,7 +209,7 @@ const Dashboard = () => {
     const maxMinutes = topGames[0]?.playtimeMinutes || 1;
 
     return (
-        <div className="w-full max-w-5xl mx-auto p-4 md:p-8 space-y-6">
+        <PageContainer className="p-4 md:p-8 space-y-6">
             <Card className="relative overflow-hidden p-6 md:p-8 flex flex-col md:flex-row md:items-center md:justify-between gap-6">
                 <div className="pointer-events-none absolute inset-0 bg-gradient-to-br from-primary/15 via-transparent to-transparent"/>
                 <div className="relative min-w-0">
@@ -316,19 +317,19 @@ const Dashboard = () => {
             )}
 
             {hasSteamId && activity && <ActivityCard activity={activity}/>}
-        </div>
+        </PageContainer>
     );
 };
 
 function DashboardSkeleton() {
     return (
-        <div className="w-full max-w-5xl mx-auto p-4 md:p-8 space-y-6">
+        <PageContainer className="p-4 md:p-8 space-y-6">
             <Skeleton className="h-40 rounded-xl"/>
             <div className="grid grid-cols-1 md:grid-cols-3 gap-6">
                 <Skeleton className="h-64 rounded-xl"/>
                 <Skeleton className="h-64 rounded-xl md:col-span-2"/>
             </div>
-        </div>
+        </PageContainer>
     );
 }
 

src/pages/Dashboard.test.jsx

@@ -3,6 +3,7 @@ import {afterEach, beforeEach, describe, expect, it, vi} from 'vitest';
 import {cleanup, render, screen, waitFor} from '@testing-library/react';
 import {MemoryRouter, Route, Routes, useLocation} from 'react-router-dom';
 import Dashboard from './Dashboard.jsx';
+import {PreferencesProvider} from '../context/PreferencesContext.jsx';
 
 vi.mock('react-i18next', () => import('../test/i18n-mock.js'));
 vi.mock('../hooks/useLibrarySync.js', () => ({default: () => ({status: 'OK', lastSyncedAt: null, isRunning: false})}));
@@ -32,12 +33,12 @@ describe('Dashboard', () => {
         globalThis.fetch = vi.fn(async (url) =>
             url.includes('/api/users/me') ? ok({email: 'a@b.de', steamId: '76561198000000000'}) : unauthorized());
         render(
-            <MemoryRouter initialEntries={['/dashboard']}>
+            <MemoryRouter initialEntries={['/dashboard']}><PreferencesProvider>
                 <Routes>
                     <Route path="/dashboard" element={<><Dashboard/><Spy/></>}/>
                     <Route path="/login" element={<Spy/>}/>
                 </Routes>
-            </MemoryRouter>,
+            </PreferencesProvider></MemoryRouter>,
         );
 
         await waitFor(() => expect(fetch.mock.calls.length).toBeGreaterThanOrEqual(5));

src/pages/GameDetail.jsx

@@ -1,7 +1,7 @@
 import {useEffect, useMemo, useState} from 'react';
 import {Link, useNavigate, useParams} from 'react-router-dom';
 import {useTranslation} from 'react-i18next';
-import {ArrowLeft, Clock, ExternalLink, ShieldOff, Trophy} from 'lucide-react';
+import {ArrowLeft, Clock, ExternalLink, Image as ImageIcon, ImageOff, ShieldOff, Trophy} from 'lucide-react';
 
 import {Badge} from '@/components/ui/badge';
 import {Button} from '@/components/ui/button';
@@ -15,6 +15,9 @@ import PlayingHint from '../components/PlayingHint.jsx';
 import TimeToBeat from '../components/TimeToBeat.jsx';
 import {formatPlaytime} from '../utils/games.js';
 import useSessionExpired from '../hooks/useSessionExpired.js';
+import useSaveAppearance from '../hooks/useSaveAppearance.js';
+import {usePreferences} from '../context/PreferencesContext.jsx';
+import PageContainer from '../components/PageContainer.jsx';
 
 const formatUnlockedAt = (instant, locale) => {
     if (!instant) return '';
@@ -28,6 +31,8 @@ const formatUnlockedAt = (instant, locale) => {
 export default function GameDetail() {
     const {t, i18n} = useTranslation();
     const {appid} = useParams();
+    const {appearance} = usePreferences();
+    const saveAppearance = useSaveAppearance();
     const navigate = useNavigate();
     const expireSession = useSessionExpired();
 
@@ -93,6 +98,8 @@ export default function GameDetail() {
         });
     }, [data]);
 
+    const isBackground = !!data && appearance.backgroundAppid === data.appid;
+
     const stats = data ? [
         [t('GAME_DETAIL.UNLOCKED'), data.achievementsUnlocked],
         [t('GAME_DETAIL.REMAINING'), data.achievementsRemaining],
@@ -100,7 +107,7 @@ export default function GameDetail() {
     ] : [];
 
     return (
-        <div className="w-full max-w-5xl mx-auto p-4 md:p-8 space-y-6">
+        <PageContainer className="p-4 md:p-8 space-y-6">
             <Button variant="ghost" size="sm" className="-ml-2" onClick={() => navigate(-1)}>
                 <ArrowLeft/>{t('GAME_DETAIL.BACK')}
             </Button>
@@ -139,11 +146,22 @@ export default function GameDetail() {
                                     <TimeToBeat time={data.timeToBeat}/>
                                 </div>
                             </div>
-                            <Button asChild variant="outline" size="sm" className="self-start">
-                                <a href={`https://store.steampowered.com/app/${data.appid}`} target="_blank" rel="noopener noreferrer">
-                                    {t('GAME_DETAIL.OPEN_IN_STEAM')}<ExternalLink/>
-                                </a>
-                            </Button>
+                            <div className="flex flex-wrap gap-2">
+                                <Button asChild variant="outline" size="sm">
+                                    <a href={`https://store.steampowered.com/app/${data.appid}`} target="_blank" rel="noopener noreferrer">
+                                        {t('GAME_DETAIL.OPEN_IN_STEAM')}<ExternalLink/>
+                                    </a>
+                                </Button>
+                                {isBackground ? (
+                                    <Button variant="outline" size="sm" onClick={() => saveAppearance({backgroundAppid: null})}>
+                                        <ImageOff/>{t('GAME_DETAIL.REMOVE_BACKGROUND')}
+                                    </Button>
+                                ) : (
+                                    <Button variant="outline" size="sm" onClick={() => saveAppearance({backgroundAppid: data.appid})}>
+                                        <ImageIcon/>{t('GAME_DETAIL.SET_BACKGROUND')}
+                                    </Button>
+                                )}
+                            </div>
                         </div>
                     </Card>
 
@@ -227,6 +245,6 @@ export default function GameDetail() {
                     )}
                 </>
             )}
-        </div>
+        </PageContainer>
     );
 }

src/pages/GameDetail.test.jsx

@@ -3,6 +3,7 @@ import {afterEach, beforeEach, describe, expect, it, vi} from 'vitest';
 import {cleanup, fireEvent, render, screen, waitFor} from '@testing-library/react';
 import {MemoryRouter, Route, Routes} from 'react-router-dom';
 import GameDetail from './GameDetail.jsx';
+import {PreferencesProvider} from '../context/PreferencesContext.jsx';
 
 vi.mock('react-i18next', () => import('../test/i18n-mock.js'));
 vi.mock('sonner', () => ({toast: {success: vi.fn(), error: vi.fn()}}));
@@ -13,9 +14,9 @@ const game = {
 };
 
 const renderDetail = () => render(
-    <MemoryRouter initialEntries={['/library/220']}>
+    <MemoryRouter initialEntries={['/library/220']}><PreferencesProvider>
         <Routes><Route path="/library/:appid" element={<GameDetail/>}/></Routes>
-    </MemoryRouter>,
+    </PreferencesProvider></MemoryRouter>,
 );
 
 beforeEach(() => {
@@ -41,4 +42,18 @@ describe('GameDetail', () => {
         await waitFor(() => expect(screen.queryByRole('button', {name: 'GAME_DETAIL.SET_PLAYING'})).toBeNull());
         expect(screen.getByLabelText('BACKLOG.NOTES_LABEL').value).toBe('my draft');
     });
+
+    it('uses the game as background and can remove it again', async () => {
+        renderDetail();
+
+        fireEvent.click(await screen.findByRole('button', {name: 'GAME_DETAIL.SET_BACKGROUND'}));
+
+        const remove = await screen.findByRole('button', {name: 'GAME_DETAIL.REMOVE_BACKGROUND'});
+        const [url, init] = fetch.mock.calls.find(([, call]) => call?.method === 'PUT');
+        expect(url).toContain('/api/users/settings/appearance');
+        expect(JSON.parse(init.body).backgroundAppid).toBe(220);
+
+        fireEvent.click(remove);
+        expect(await screen.findByRole('button', {name: 'GAME_DETAIL.SET_BACKGROUND'})).toBeTruthy();
+    });
 });

src/pages/GameLibrary.jsx

@@ -18,6 +18,7 @@ import {Skeleton} from '@/components/ui/skeleton';
 import GameCover from '../components/GameCover.jsx';
 import LibraryTabs from '../components/LibraryTabs.jsx';
 import GameStatusBadge from '../components/GameStatusBadge.jsx';
+import PageContainer from '../components/PageContainer.jsx';
 
 const PAGE_SIZES = [20, 40, 80];
 const DEFAULT_SIZE = 20;
@@ -146,7 +147,7 @@ export default function GameLibrary() {
     const ready = !isLoading && !error;
 
     return (
-        <div className="w-full max-w-5xl mx-auto p-4 md:p-8 space-y-6">
+        <PageContainer className="p-4 md:p-8 space-y-6">
             <div className="flex flex-col gap-4 md:flex-row md:items-end md:justify-between">
                 <div className="space-y-2">
                     <LibraryTabs/>
@@ -292,6 +293,6 @@ export default function GameLibrary() {
                     </Button>
                 </div>
             )}
-        </div>
+        </PageContainer>
     );
 }

src/pages/GameLibrary.test.jsx

@@ -3,6 +3,7 @@ import {afterEach, beforeEach, describe, expect, it, vi} from 'vitest';
 import {act, cleanup, fireEvent, render, screen, waitFor} from '@testing-library/react';
 import {MemoryRouter, Route, Routes, useLocation, useNavigate} from 'react-router-dom';
 import GameLibrary from './GameLibrary.jsx';
+import {PreferencesProvider} from '../context/PreferencesContext.jsx';
 
 vi.mock('react-i18next', () => import('../test/i18n-mock.js'));
 vi.mock('../hooks/useLibrarySync.js', () => ({default: () => ({status: 'OK', lastSyncedAt: null, isRunning: false})}));
@@ -26,9 +27,9 @@ function renderLibrary(initialEntry = '/library') {
         return null;
     }
     render(
-        <MemoryRouter initialEntries={[initialEntry]}>
+        <MemoryRouter initialEntries={[initialEntry]}><PreferencesProvider>
             <Routes><Route path="/library" element={<><GameLibrary/><Spy/></>}/></Routes>
-        </MemoryRouter>,
+        </PreferencesProvider></MemoryRouter>,
     );
     return {
         navigations: () => lib.navigations,

src/pages/PublicProfilePage.jsx

@@ -9,6 +9,7 @@ import GameCover from '../components/GameCover.jsx';
 import GameStatusBadge, {STATUS_META} from '../components/GameStatusBadge.jsx';
 import {GAME_STATUSES} from '../utils/backlog.js';
 import {formatPlaytime} from '../utils/games.js';
+import PageContainer from '../components/PageContainer.jsx';
 
 /**
  * Public, no login. Auth returns a short-lived ticket for a public profile; Core returns the data for it.
@@ -64,22 +65,22 @@ export default function PublicProfilePage() {
 
     if (error) {
         return (
-            <div className="w-full max-w-5xl mx-auto p-4 md:p-8">
+            <PageContainer className="p-4 md:p-8">
                 <Card className="items-center py-16 text-center text-muted-foreground">
                     <UserRoundX className="size-10"/>
                     <p className="max-w-sm text-sm">{error}</p>
                     <Link to="/" className="text-sm font-medium text-primary hover:underline">{t('PROFILE.TO_START')}</Link>
                 </Card>
-            </div>
+            </PageContainer>
         );
     }
 
     if (!library) {
         return (
-            <div className="w-full max-w-5xl mx-auto p-4 md:p-8 space-y-6">
+            <PageContainer className="p-4 md:p-8 space-y-6">
                 <Skeleton className="h-36 rounded-xl"/>
                 <Skeleton className="h-64 rounded-xl"/>
-            </div>
+            </PageContainer>
         );
     }
 
@@ -94,7 +95,7 @@ export default function PublicProfilePage() {
         : null;
 
     return (
-        <div className="w-full max-w-5xl mx-auto p-4 md:p-8 space-y-6">
+        <PageContainer className="p-4 md:p-8 space-y-6">
             <Card className="relative overflow-hidden p-6 md:p-8 gap-6">
                 <div className="pointer-events-none absolute inset-0 bg-gradient-to-br from-primary/15 via-transparent to-transparent"/>
                 <div className="relative">
@@ -174,6 +175,6 @@ export default function PublicProfilePage() {
                     </ul>
                 </Card>
             )}
-        </div>
+        </PageContainer>
     );
 }

src/pages/PublicProfilePage.test.jsx

@@ -3,6 +3,7 @@ import {afterEach, describe, expect, it, vi} from 'vitest';
 import {cleanup, render, screen, waitFor} from '@testing-library/react';
 import {MemoryRouter, Route, Routes} from 'react-router-dom';
 import PublicProfilePage from './PublicProfilePage.jsx';
+import {PreferencesProvider} from '../context/PreferencesContext.jsx';
 
 vi.mock('react-i18next', () => import('../test/i18n-mock.js'));
 
@@ -24,9 +25,9 @@ function mockBackends({profileStatus = 200, libraryStatus = 200} = {}) {
 }
 
 const renderPage = (name = 'Lobo') => render(
-    <MemoryRouter initialEntries={[`/u/${name}`]}>
+    <MemoryRouter initialEntries={[`/u/${name}`]}><PreferencesProvider>
         <Routes><Route path="/u/:name" element={<PublicProfilePage/>}/></Routes>
-    </MemoryRouter>,
+    </PreferencesProvider></MemoryRouter>,
 );
 
 describe('PublicProfilePage', () => {

src/pages/SettingsPage.jsx

@@ -4,7 +4,7 @@ import {useTranslation} from 'react-i18next';
 import {useForm} from 'react-hook-form';
 import {zodResolver} from '@hookform/resolvers/zod';
 
-import {Copy, Gamepad2, Loader2, Save, SlidersHorizontal, UserRound} from 'lucide-react';
+import {Copy, Gamepad2, ImageOff, Loader2, Palette, Save, SlidersHorizontal, UserRound} from 'lucide-react';
 import {toast} from 'sonner';
 
 import {Button} from '@/components/ui/button';
@@ -18,6 +18,10 @@ import FormField from '../components/FormField.jsx';
 import {settingsSchema} from '../utils/validation.js';
 import {usePreferences} from '../context/PreferencesContext.jsx';
 import useSessionExpired from '../hooks/useSessionExpired.js';
+import useSaveAppearance from '../hooks/useSaveAppearance.js';
+import {ACCENTS, CORNERS} from '../utils/appearance.js';
+import {coverUrl} from '../utils/games.js';
+import {cn} from '@/lib/utils';
 
 const BACKEND_ERROR_KEY = {
     STEAM_ID_ALREADY_IN_USE: 'REGISTRATION.ERROR_STEAM_ID_IN_USE',
@@ -39,7 +43,8 @@ export default function SettingsPage() {
     const {t, i18n} = useTranslation();
     const navigate = useNavigate();
     const expireSession = useSessionExpired();
-    const {isDarkMode, setDarkMode, setLanguage} = usePreferences();
+    const {isDarkMode, setDarkMode, setLanguage, appearance} = usePreferences();
+    const saveAppearance = useSaveAppearance();
 
     const [profile, setProfile] = useState(null);
     const [isLoading, setIsLoading] = useState(true);
@@ -268,6 +273,68 @@ export default function SettingsPage() {
                 </CardContent>
             </Card>
 
+            <Card>
+                <CardHeader>
+                    <CardTitle className="flex items-center gap-2"><Palette className="size-4 text-primary"/>{t('SETTINGS.APPEARANCE')}</CardTitle>
+                </CardHeader>
+                <CardContent className="space-y-6">
+                    <div className="flex flex-col gap-3 sm:flex-row sm:items-center sm:justify-between">
+                        <Label id="accent-label">{t('SETTINGS.ACCENT')}</Label>
+                        <div role="group" aria-labelledby="accent-label" className="flex flex-wrap gap-2">
+                            {ACCENTS.map((accent) => (
+                                <button key={accent} type="button" data-accent={accent}
+                                        aria-label={t(`SETTINGS.ACCENT_OPTIONS.${accent.toUpperCase()}`)}
+                                        title={t(`SETTINGS.ACCENT_OPTIONS.${accent.toUpperCase()}`)}
+                                        aria-pressed={appearance.accent === accent}
+                                        onClick={() => saveAppearance({accent})}
+                                        className={cn('size-8 rounded-full bg-primary ring-offset-2 ring-offset-background transition hover:scale-110',
+                                            appearance.accent === accent && 'ring-2 ring-foreground')}/>
+                            ))}
+                        </div>
+                    </div>
+                    <div className="flex flex-col gap-3 sm:flex-row sm:items-center sm:justify-between">
+                        <Label id="corners-label">{t('SETTINGS.CORNERS')}</Label>
+                        <div role="group" aria-labelledby="corners-label" className="flex gap-2">
+                            {CORNERS.map((corners) => (
+                                <Button key={corners} type="button" size="sm" data-corners={corners}
+                                        variant={appearance.corners === corners ? 'default' : 'outline'}
+                                        aria-pressed={appearance.corners === corners}
+                                        onClick={() => saveAppearance({corners})}>
+                                    {t(`SETTINGS.CORNER_OPTIONS.${corners.toUpperCase()}`)}
+                                </Button>
+                            ))}
+                        </div>
+                    </div>
+                    <div className="flex items-center justify-between gap-4">
+                        <div className="space-y-1">
+                            <Label htmlFor="wideLayout">{t('SETTINGS.WIDE_LAYOUT')}</Label>
+                            <p className="text-xs text-muted-foreground">{t('SETTINGS.WIDE_LAYOUT_HINT')}</p>
+                        </div>
+                        <Switch id="wideLayout" checked={appearance.wideLayout}
+                                onCheckedChange={(wideLayout) => saveAppearance({wideLayout})}/>
+                    </div>
+                    <div className="flex items-center justify-between gap-4">
+                        <div className="space-y-1">
+                            <Label>{t('SETTINGS.BACKGROUND')}</Label>
+                            {!appearance.backgroundAppid && (
+                                <p className="text-xs text-muted-foreground">{t('SETTINGS.BACKGROUND_HINT')}</p>
+                            )}
+                        </div>
+                        {appearance.backgroundAppid && (
+                            <div className="flex items-center gap-2">
+                                <img src={coverUrl(appearance.backgroundAppid)} alt=""
+                                     onError={(event) => { event.currentTarget.hidden = true; }}
+                                     className="h-10 w-20 rounded-md object-cover"/>
+                                <Button type="button" variant="outline" size="sm"
+                                        onClick={() => saveAppearance({backgroundAppid: null})}>
+                                    <ImageOff/>{t('SETTINGS.BACKGROUND_REMOVE')}
+                                </Button>
+                            </div>
+                        )}
+                    </div>
+                </CardContent>
+            </Card>
+
             <Card>
                 <CardHeader>
                     <CardTitle className="flex items-center gap-2"><Gamepad2 className="size-4 text-primary"/>{t('SETTINGS.PROFILE')}</CardTitle>

src/pages/SettingsPage.test.jsx

@@ -74,3 +74,39 @@ describe('SettingsPage public profile', () => {
         await waitFor(() => expect(screen.getByRole('switch', {name: 'SETTINGS.PUBLIC_PROFILE'}).getAttribute('aria-checked')).toBe('false'));
     });
 });
+
+describe('SettingsPage appearance', () => {
+    beforeEach(() => localStorage.setItem('tbp_jwt', 'token'));
+
+    afterEach(() => {
+        cleanup();
+        localStorage.clear();
+    });
+
+    const appearancePuts = () => fetch.mock.calls
+        .filter(([url, init]) => init?.method === 'PUT' && url.endsWith('/api/users/settings/appearance'))
+        .map(([, init]) => JSON.parse(init.body));
+
+    it('saves a picked accent and corner style and marks them as picked', async () => {
+        renderPage(profile());
+
+        fireEvent.click(await screen.findByRole('button', {name: 'SETTINGS.ACCENT_OPTIONS.GREEN'}));
+        fireEvent.click(screen.getByRole('button', {name: 'SETTINGS.CORNER_OPTIONS.ROUND'}));
+
+        await waitFor(() => expect(appearancePuts()).toHaveLength(2));
+        expect(appearancePuts()[1]).toEqual({accent: 'green', corners: 'round', wideLayout: false, backgroundAppid: null});
+        expect(screen.getByRole('button', {name: 'SETTINGS.ACCENT_OPTIONS.GREEN'}).getAttribute('aria-pressed')).toBe('true');
+        expect(screen.getByRole('button', {name: 'SETTINGS.ACCENT_OPTIONS.VIOLET'}).getAttribute('aria-pressed')).toBe('false');
+    });
+
+    it('removes the background', async () => {
+        localStorage.setItem('tbp_appearance', JSON.stringify({backgroundAppid: 620}));
+        renderPage(profile());
+
+        fireEvent.click(await screen.findByRole('button', {name: 'SETTINGS.BACKGROUND_REMOVE'}));
+
+        await waitFor(() => expect(appearancePuts()).toHaveLength(1));
+        expect(appearancePuts()[0].backgroundAppid).toBeNull();
+        expect(screen.getByText('SETTINGS.BACKGROUND_HINT')).toBeTruthy();
+    });
+});

src/pages/WishlistPage.jsx

@@ -10,6 +10,7 @@ import {Skeleton} from '@/components/ui/skeleton';
 import GameCover from '../components/GameCover.jsx';
 import LibraryTabs from '../components/LibraryTabs.jsx';
 import useSessionExpired from '../hooks/useSessionExpired.js';
+import PageContainer from '../components/PageContainer.jsx';
 
 const formatAdded = (instant, locale) =>
     instant ? new Date(instant).toLocaleDateString(locale, {year: 'numeric', month: 'short', day: 'numeric'}) : null;
@@ -59,7 +60,7 @@ export default function WishlistPage() {
     const onSaleCount = (games ?? []).filter((g) => g.discountPct > 0).length;
 
     return (
-        <div className="w-full max-w-5xl mx-auto p-4 md:p-8 space-y-6">
+        <PageContainer className="p-4 md:p-8 space-y-6">
             <div className="flex flex-col gap-4 md:flex-row md:items-end md:justify-between">
                 <div className="space-y-3">
                     <LibraryTabs/>
@@ -142,6 +143,6 @@ export default function WishlistPage() {
                     </ul>
                 </Card>
             )}
-        </div>
+        </PageContainer>
     );
 }

src/pages/WishlistPage.test.jsx

@@ -3,6 +3,7 @@ import {afterEach, beforeEach, describe, expect, it, vi} from 'vitest';
 import {cleanup, fireEvent, render, screen, waitFor} from '@testing-library/react';
 import {MemoryRouter, Route, Routes, useLocation} from 'react-router-dom';
 import WishlistPage from './WishlistPage.jsx';
+import {PreferencesProvider} from '../context/PreferencesContext.jsx';
 
 vi.mock('react-i18next', () => import('../test/i18n-mock.js'));
 
@@ -16,12 +17,12 @@ function LoginState() {
 }
 
 const renderPage = () => render(
-    <MemoryRouter initialEntries={['/wishlist']}>
+    <MemoryRouter initialEntries={['/wishlist']}><PreferencesProvider>
         <Routes>
             <Route path="/wishlist" element={<WishlistPage/>}/>
             <Route path="/login" element={<LoginState/>}/>
         </Routes>
-    </MemoryRouter>,
+    </PreferencesProvider></MemoryRouter>,
 );
 
 describe('WishlistPage', () => {

src/style.css

@@ -48,6 +48,114 @@
     --ring: oklch(0.541 0.281 293.009);
 }
 
+/*
+ * Appearance presets (utils/appearance.js). Set as data attributes on <html>; the settings page also sets them on
+ * its preview buttons, so each button shows its own preset. Violet repeats the defaults above for that reason.
+ * Green and orange are too light for white text, so their dark buttons get dark text.
+ */
+[data-accent="violet"] {
+    --primary: oklch(0.541 0.281 293.009);
+    --primary-foreground: oklch(0.969 0.016 293.756);
+    --accent: oklch(0.943 0.029 294.588);
+    --accent-foreground: oklch(0.38 0.189 293.745);
+    --ring: oklch(0.606 0.25 292.717);
+}
+.dark[data-accent="violet"],
+.dark [data-accent="violet"] {
+    --primary: oklch(0.606 0.25 292.717);
+    --primary-foreground: oklch(0.969 0.016 293.756);
+    --accent: oklch(0.283 0.141 291.089);
+    --accent-foreground: oklch(0.894 0.057 293.283);
+    --ring: oklch(0.541 0.281 293.009);
+}
+[data-accent="blue"] {
+    --primary: oklch(0.546 0.245 262.881);
+    --primary-foreground: oklch(0.97 0.014 254.604);
+    --accent: oklch(0.932 0.032 255.585);
+    --accent-foreground: oklch(0.424 0.199 265.638);
+    --ring: oklch(0.623 0.214 259.815);
+}
+.dark[data-accent="blue"],
+.dark [data-accent="blue"] {
+    --primary: oklch(0.623 0.214 259.815);
+    --primary-foreground: oklch(0.97 0.014 254.604);
+    --accent: oklch(0.282 0.091 267.935);
+    --accent-foreground: oklch(0.882 0.059 254.128);
+    --ring: oklch(0.546 0.245 262.881);
+}
+[data-accent="green"] {
+    --primary: oklch(0.527 0.154 150.069);
+    --primary-foreground: oklch(0.982 0.018 155.826);
+    --accent: oklch(0.962 0.044 156.743);
+    --accent-foreground: oklch(0.448 0.119 151.328);
+    --ring: oklch(0.627 0.194 149.214);
+}
+.dark[data-accent="green"],
+.dark [data-accent="green"] {
+    --primary: oklch(0.723 0.219 149.579);
+    --primary-foreground: oklch(0.266 0.065 152.934);
+    --accent: oklch(0.266 0.065 152.934);
+    --accent-foreground: oklch(0.925 0.084 155.995);
+    --ring: oklch(0.627 0.194 149.214);
+}
+[data-accent="orange"] {
+    --primary: oklch(0.553 0.195 38.402);
+    --primary-foreground: oklch(0.98 0.016 73.684);
+    --accent: oklch(0.954 0.038 75.164);
+    --accent-foreground: oklch(0.47 0.157 37.304);
+    --ring: oklch(0.646 0.222 41.116);
+}
+.dark[data-accent="orange"],
+.dark [data-accent="orange"] {
+    --primary: oklch(0.705 0.213 47.604);
+    --primary-foreground: oklch(0.266 0.079 36.259);
+    --accent: oklch(0.266 0.079 36.259);
+    --accent-foreground: oklch(0.901 0.076 70.697);
+    --ring: oklch(0.646 0.222 41.116);
+}
+[data-accent="pink"] {
+    --primary: oklch(0.592 0.249 0.584);
+    --primary-foreground: oklch(0.971 0.014 343.198);
+    --accent: oklch(0.948 0.028 342.258);
+    --accent-foreground: oklch(0.459 0.187 3.815);
+    --ring: oklch(0.656 0.241 354.308);
+}
+.dark[data-accent="pink"],
+.dark [data-accent="pink"] {
+    --primary: oklch(0.592 0.249 0.584);
+    --primary-foreground: oklch(0.971 0.014 343.198);
+    --accent: oklch(0.284 0.109 3.907);
+    --accent-foreground: oklch(0.899 0.061 343.231);
+    --ring: oklch(0.656 0.241 354.308);
+}
+[data-accent="red"] {
+    --primary: oklch(0.577 0.245 27.325);
+    --primary-foreground: oklch(0.971 0.013 17.38);
+    --accent: oklch(0.936 0.032 17.717);
+    --accent-foreground: oklch(0.444 0.177 26.899);
+    --ring: oklch(0.637 0.237 25.331);
+}
+.dark[data-accent="red"],
+.dark [data-accent="red"] {
+    --primary: oklch(0.577 0.245 27.325);
+    --primary-foreground: oklch(0.971 0.013 17.38);
+    --accent: oklch(0.258 0.092 26.042);
+    --accent-foreground: oklch(0.885 0.062 18.334);
+    --ring: oklch(0.637 0.237 25.331);
+}
+
+[data-corners="sharp"] {
+    --radius: 0.25rem;
+}
+
+[data-corners="default"] {
+    --radius: 0.75rem;
+}
+
+[data-corners="round"] {
+    --radius: 1.25rem;
+}
+
 @theme inline {
     --font-sans: "Inter Variable", ui-sans-serif, system-ui, sans-serif;
     --radius-sm: calc(var(--radius) - 4px);

src/utils/appearance.js

@@ -0,0 +1,65 @@
+// Auth accepts only these names (AppearanceRequest); style.css has a preset for each.
+export const ACCENTS = ['violet', 'blue', 'green', 'orange', 'pink', 'red'];
+export const CORNERS = ['sharp', 'default', 'round'];
+
+export const DEFAULT_APPEARANCE = {accent: 'violet', corners: 'default', wideLayout: false, backgroundAppid: null};
+
+const STORAGE_KEY = 'tbp_appearance';
+const REQUEST_TIMEOUT_MS = 10000;
+
+export const normalizeAppearance = (value) => ({
+    accent: ACCENTS.includes(value?.accent) ? value.accent : DEFAULT_APPEARANCE.accent,
+    corners: CORNERS.includes(value?.corners) ? value.corners : DEFAULT_APPEARANCE.corners,
+    wideLayout: value?.wideLayout === true,
+    backgroundAppid: Number.isInteger(value?.backgroundAppid) && value.backgroundAppid > 0 ? value.backgroundAppid : null,
+});
+
+/**
+ * The last known appearance, so the first paint does not flash the default look before Auth answers.
+ */
+export const readCachedAppearance = () => {
+    try {
+        return normalizeAppearance(JSON.parse(localStorage.getItem(STORAGE_KEY)));
+    } catch {
+        return DEFAULT_APPEARANCE;
+    }
+};
+
+export const cacheAppearance = (appearance) => {
+    try {
+        localStorage.setItem(STORAGE_KEY, JSON.stringify(appearance));
+    } catch {
+        // Private mode or a full storage: the look is only not cached.
+    }
+};
+
+export const applyAppearance = (appearance, root = document.documentElement) => {
+    root.dataset.accent = appearance.accent;
+    root.dataset.corners = appearance.corners;
+};
+
+/**
+ * PUT /api/users/settings/appearance on Auth. The caller handles the response status.
+ */
+export const saveAppearance = (appearance) =>
+    fetch(`${import.meta.env.VITE_API_URL}/api/users/settings/appearance`, {
+        method: 'PUT',
+        headers: {'Authorization': `Bearer ${localStorage.getItem('tbp_jwt')}`, 'Content-Type': 'application/json'},
+        body: JSON.stringify(appearance),
+        // Saves run one after another; a hung request must not hold back the next ones.
+        signal: AbortSignal.timeout(REQUEST_TIMEOUT_MS),
+    });
+
+/**
+ * GET /api/users/me on Auth, only for its appearance. Null when there is no answer to use.
+ */
+export const loadAppearance = async () => {
+    const response = await fetch(`${import.meta.env.VITE_API_URL}/api/users/me?v=1`, {
+        headers: {'Authorization': `Bearer ${localStorage.getItem('tbp_jwt')}`},
+        // Saves wait for this load.
+        signal: AbortSignal.timeout(REQUEST_TIMEOUT_MS),
+    });
+    if (!response.ok) return null;
+    const data = await response.json();
+    return data.settings?.appearance ? normalizeAppearance(data.settings.appearance) : null;
+};

src/utils/appearance.test.js

@@ -0,0 +1,52 @@
+// @vitest-environment jsdom
+import {afterEach, describe, expect, it} from 'vitest';
+import {
+    applyAppearance,
+    cacheAppearance,
+    DEFAULT_APPEARANCE,
+    normalizeAppearance,
+    readCachedAppearance,
+} from './appearance.js';
+
+describe('normalizeAppearance', () => {
+    it('keeps known values', () => {
+        const appearance = {accent: 'blue', corners: 'round', wideLayout: true, backgroundAppid: 620};
+
+        expect(normalizeAppearance(appearance)).toEqual(appearance);
+    });
+
+    it('replaces unknown or missing values with the defaults', () => {
+        expect(normalizeAppearance({accent: 'red;x', corners: 'pointy', wideLayout: 'yes', backgroundAppid: -1}))
+            .toEqual(DEFAULT_APPEARANCE);
+        expect(normalizeAppearance(null)).toEqual(DEFAULT_APPEARANCE);
+        expect(normalizeAppearance({backgroundAppid: 1.5})).toEqual(DEFAULT_APPEARANCE);
+    });
+});
+
+describe('appearance cache', () => {
+    afterEach(() => localStorage.clear());
+
+    it('reads back what was cached', () => {
+        cacheAppearance({accent: 'green', corners: 'sharp', wideLayout: false, backgroundAppid: null});
+
+        expect(readCachedAppearance()).toEqual({accent: 'green', corners: 'sharp', wideLayout: false, backgroundAppid: null});
+    });
+
+    it('falls back to the defaults for a broken or empty cache', () => {
+        expect(readCachedAppearance()).toEqual(DEFAULT_APPEARANCE);
+
+        localStorage.setItem('tbp_appearance', '{broken');
+        expect(readCachedAppearance()).toEqual(DEFAULT_APPEARANCE);
+    });
+});
+
+describe('applyAppearance', () => {
+    it('sets the presets as data attributes for the CSS', () => {
+        const root = document.createElement('html');
+
+        applyAppearance({accent: 'orange', corners: 'round', wideLayout: true, backgroundAppid: 620}, root);
+
+        expect(root.dataset.accent).toBe('orange');
+        expect(root.dataset.corners).toBe('round');
+    });
+});

src/utils/games.js

@@ -12,3 +12,6 @@ export const formatPlaytime = (minutes) => {
 
 // 460x215 store header. Not every app has one; callers need an onError fallback.
 export const coverUrl = (appid) => `https://cdn.cloudflare.steamstatic.com/steam/apps/${appid}/header.jpg`;
+
+// 1920x620 library art. Older apps have none; callers need an onError fallback.
+export const heroUrl = (appid) => `https://cdn.cloudflare.steamstatic.com/steam/apps/${appid}/library_hero.jpg`;