feat(mangas): per-field sort options + direction toggle on the catalog (0.88.0)

Sort the manga catalog by created / updated / title / author with an
independent asc/desc direction control. An omitted `order` defaults per field
(dates newest-first, text A→Z), matching the UI, so a bare `?sort=<field>`
means the same thing in the browser and over the API; `sort=recent` remains a
back-compat alias for `created`.

- Backend: SortField/SortOrder parsed with validation (structured 422 on bad
  input), per-field default_order, NULLS LAST only on the nullable author key,
  and migration 0033 indexing mangas(updated_at DESC, id) to back the default
  sort and its id tie-break.
- Frontend: catalog sort field + direction (SegmentedControl) on desktop and a
  mobile bottom sheet; pure helpers in $lib/mangaSort; keyboard-accessible
  direction control; visible Direction labels and a sheet "Done" button.
- Tests: backend integration coverage (defaults, alias, invalid input,
  ascending-id tie-break), frontend unit + e2e.

Co-Authored-By: Claude Opus 4.8 <noreply@anthropic.com>

frontend/src/lib/api/mangas.test.ts

@@ -89,7 +89,7 @@ describe('mangas api client', () => {
         expect(result.page).toEqual({ limit: 50, offset: 0, total: 1 });
     });
 
-    it('listMangas encodes search, status, ids (csv), limit, offset, sort', async () => {
+    it('listMangas encodes search, status, ids (csv), limit, offset, sort, order', async () => {
         fetchSpy.mockResolvedValueOnce(ok(emptyPage()));
         await listMangas({
             search: 'one piece',
@@ -99,7 +99,8 @@ describe('mangas api client', () => {
             tagIds: ['t1', 't2'],
             limit: 10,
             offset: 20,
-            sort: 'title'
+            sort: 'title',
+            order: 'asc'
         });
         const url = fetchSpy.mock.calls[0][0] as string;
         expect(url).toMatch(/\/v1\/mangas\?/);
@@ -113,6 +114,7 @@ describe('mangas api client', () => {
         expect(url).toContain('limit=10');
         expect(url).toContain('offset=20');
         expect(url).toContain('sort=title');
+        expect(url).toContain('order=asc');
     });
 
     it('getManga returns the enriched detail shape', async () => {

frontend/src/lib/api/mangas.ts

@@ -1,7 +1,8 @@
 import { request, type Manga, type MangaStatus, type Page } from './client';
 import type { ContentWarning } from './page_tags';
 
-export type MangaSort = 'recent' | 'title';
+export type MangaSort = 'created' | 'updated' | 'title' | 'author';
+export type SortOrder = 'asc' | 'desc';
 
 export type AuthorRef = { id: string; name: string };
 export type GenreRef = { id: string; name: string };
@@ -39,6 +40,7 @@ export type ListOptions = {
     limit?: number;
     offset?: number;
     sort?: MangaSort;
+    order?: SortOrder;
 };
 
 export type MangasPage = {
@@ -68,6 +70,7 @@ export async function listMangas(opts: ListOptions = {}): Promise<MangasPage> {
     if (opts.limit != null) params.set('limit', String(opts.limit));
     if (opts.offset != null) params.set('offset', String(opts.offset));
     if (opts.sort) params.set('sort', opts.sort);
+    if (opts.order) params.set('order', opts.order);
     const qs = params.toString();
     return request<MangasPage>(`/v1/mangas${qs ? `?${qs}` : ''}`);
 }

frontend/src/lib/components/SegmentedControl.svelte

@@ -17,14 +17,69 @@
         ariaLabel: string;
         testid?: string;
     } = $props();
+
+    // Roving-tabindex refs so arrow keys can move focus across the group.
+    let buttons = $state<HTMLButtonElement[]>([]);
+
+    function select(index: number) {
+        const opt = options[index];
+        if (!opt) return;
+        if (opt.value !== value) onchange(opt.value);
+        // Selection follows focus, per the WAI-ARIA radiogroup pattern.
+        buttons[index]?.focus();
+    }
+
+    // ArrowLeft/Up and ArrowRight/Down move (and wrap) through the options;
+    // Home/End jump to the ends. Without this a control announced as a
+    // `radiogroup` would not respond to the keys AT users expect.
+    function onkeydown(event: KeyboardEvent) {
+        // Navigate relative to the focused button, not the selected `value`:
+        // this control is parent-controlled, so `value` only updates after a
+        // re-render — anchoring on focus keeps rapid keypresses from sticking.
+        // Falls back to `value` when focus is elsewhere (e.g. event delegated
+        // from outside a child, as in unit tests).
+        const focused = buttons.findIndex((b) => b === document.activeElement);
+        const current = focused >= 0 ? focused : options.findIndex((o) => o.value === value);
+        switch (event.key) {
+            case 'ArrowRight':
+            case 'ArrowDown':
+                event.preventDefault();
+                select((current + 1) % options.length);
+                break;
+            case 'ArrowLeft':
+            case 'ArrowUp':
+                event.preventDefault();
+                select((current - 1 + options.length) % options.length);
+                break;
+            case 'Home':
+                event.preventDefault();
+                select(0);
+                break;
+            case 'End':
+                event.preventDefault();
+                select(options.length - 1);
+                break;
+        }
+    }
 </script>
 
-<div class="segmented" role="radiogroup" aria-label={ariaLabel} data-testid={testid}>
-    {#each options as opt (opt.value)}
+<!-- Keydown is delegated here; focus lives on the child radios via roving
+     tabindex, so the group itself is intentionally not a focus target. -->
+<!-- svelte-ignore a11y_interactive_supports_focus -->
+<div
+    class="segmented"
+    role="radiogroup"
+    aria-label={ariaLabel}
+    data-testid={testid}
+    {onkeydown}
+>
+    {#each options as opt, i (opt.value)}
         <button
+            bind:this={buttons[i]}
             type="button"
             role="radio"
             aria-checked={opt.value === value}
+            tabindex={opt.value === value ? 0 : -1}
             class="seg"
             class:active={opt.value === value}
             onclick={() => {

frontend/src/lib/components/SegmentedControl.svelte.test.ts

@@ -1,5 +1,5 @@
 import { describe, it, expect, vi, afterEach } from 'vitest';
-import { render, screen, cleanup } from '@testing-library/svelte';
+import { render, screen, cleanup, fireEvent } from '@testing-library/svelte';
 import SegmentedControl from './SegmentedControl.svelte';
 
 afterEach(() => cleanup());
@@ -50,4 +50,74 @@ describe('SegmentedControl', () => {
         });
         expect(screen.getByRole('radiogroup', { name: 'Library tab' })).toBeTruthy();
     });
+
+    it('gives the selected option a roving tabindex of 0 and the rest -1', () => {
+        render(SegmentedControl, {
+            props: { options: opts, value: 'collections', onchange: () => {}, ariaLabel: 'Library tab' }
+        });
+        expect(screen.getByRole('radio', { name: 'Collections' }).getAttribute('tabindex')).toBe('0');
+        expect(screen.getByRole('radio', { name: 'Bookmarks' }).getAttribute('tabindex')).toBe('-1');
+        expect(screen.getByRole('radio', { name: 'History' }).getAttribute('tabindex')).toBe('-1');
+    });
+
+    it('selects the next option on ArrowRight/ArrowDown (selection follows focus)', async () => {
+        const onchange = vi.fn();
+        render(SegmentedControl, {
+            props: { options: opts, value: 'bookmarks', onchange, ariaLabel: 'Library tab' }
+        });
+        const group = screen.getByRole('radiogroup', { name: 'Library tab' });
+        const first = screen.getByRole('radio', { name: 'Bookmarks' });
+        first.focus();
+        await fireEvent.keyDown(group, { key: 'ArrowRight' });
+        expect(onchange).toHaveBeenCalledWith('collections');
+        onchange.mockClear();
+        // Re-anchor on the first option to assert ArrowDown behaves the same.
+        first.focus();
+        await fireEvent.keyDown(group, { key: 'ArrowDown' });
+        expect(onchange).toHaveBeenCalledWith('collections');
+    });
+
+    it('wraps from the first option to the last on ArrowLeft', async () => {
+        const onchange = vi.fn();
+        render(SegmentedControl, {
+            props: { options: opts, value: 'bookmarks', onchange, ariaLabel: 'Library tab' }
+        });
+        await fireEvent.keyDown(screen.getByRole('radiogroup', { name: 'Library tab' }), {
+            key: 'ArrowLeft'
+        });
+        expect(onchange).toHaveBeenCalledWith('history');
+    });
+
+    it('jumps to the first/last option with Home/End', async () => {
+        const onchange = vi.fn();
+        render(SegmentedControl, {
+            props: { options: opts, value: 'collections', onchange, ariaLabel: 'Library tab' }
+        });
+        const group = screen.getByRole('radiogroup', { name: 'Library tab' });
+        await fireEvent.keyDown(group, { key: 'Home' });
+        expect(onchange).toHaveBeenCalledWith('bookmarks');
+        onchange.mockClear();
+        await fireEvent.keyDown(group, { key: 'End' });
+        expect(onchange).toHaveBeenCalledWith('history');
+    });
+
+    // Navigation anchors on the focused button, not the (parent-controlled,
+    // lagging) `value` prop: even when `value` never updates, consecutive
+    // ArrowRights fired on the focused child advance step by step. This pins
+    // both the keydown-bubbles-from-child path and the no-stick behavior.
+    it('advances step by step on consecutive ArrowRights, following focus', async () => {
+        const onchange = vi.fn();
+        render(SegmentedControl, {
+            props: { options: opts, value: 'bookmarks', onchange, ariaLabel: 'Library tab' }
+        });
+        screen.getByRole('radio', { name: 'Bookmarks' }).focus();
+        await fireEvent.keyDown(document.activeElement as Element, { key: 'ArrowRight' });
+        expect(onchange).toHaveBeenLastCalledWith('collections');
+        expect((document.activeElement as HTMLElement).textContent?.trim()).toBe('Collections');
+        // `value` is still 'bookmarks' (vi.fn never feeds it back), yet the next
+        // press lands on the third option because it anchors on focus.
+        await fireEvent.keyDown(document.activeElement as Element, { key: 'ArrowRight' });
+        expect(onchange).toHaveBeenLastCalledWith('history');
+        expect((document.activeElement as HTMLElement).textContent?.trim()).toBe('History');
+    });
 });

frontend/src/lib/mangaSort.test.ts

@@ -0,0 +1,91 @@
+import { describe, it, expect } from 'vitest';
+import type { MangaSort, SortOrder } from './api/mangas';
+import {
+    DEFAULT_SORT,
+    defaultOrderFor,
+    isTextField,
+    dirOptions,
+    dirLabel,
+    sortLabel,
+    coerceSort,
+    coerceOrder,
+    sortUrlParams
+} from './mangaSort';
+
+const FIELDS: MangaSort[] = ['created', 'updated', 'title', 'author'];
+const ORDERS: SortOrder[] = ['asc', 'desc'];
+
+describe('mangaSort', () => {
+    it('classifies text vs date fields', () => {
+        expect(isTextField('title')).toBe(true);
+        expect(isTextField('author')).toBe(true);
+        expect(isTextField('created')).toBe(false);
+        expect(isTextField('updated')).toBe(false);
+    });
+
+    it('defaults date fields to desc and text fields to asc', () => {
+        expect(defaultOrderFor('created')).toBe('desc');
+        expect(defaultOrderFor('updated')).toBe('desc');
+        expect(defaultOrderFor('title')).toBe('asc');
+        expect(defaultOrderFor('author')).toBe('asc');
+    });
+
+    it('labels the direction toggle per field type', () => {
+        expect(dirOptions('title').map((o) => o.label)).toEqual(['A→Z', 'Z→A']);
+        expect(dirOptions('updated').map((o) => o.label)).toEqual(['Newest', 'Oldest']);
+    });
+
+    it('dirLabel never returns empty for a valid order', () => {
+        for (const f of FIELDS) {
+            for (const o of ORDERS) {
+                expect(dirLabel(f, o)).not.toBe('');
+            }
+        }
+    });
+
+    it('composes a readable sort label without a dangling separator', () => {
+        expect(sortLabel('updated', 'desc')).toBe('Last updated · Newest');
+        expect(sortLabel('title', 'asc')).toBe('Title · A→Z');
+        expect(sortLabel('author', 'desc')).toBe('Author · Z→A');
+    });
+
+    it('coerceSort accepts valid fields and falls back to the default otherwise', () => {
+        for (const f of FIELDS) expect(coerceSort(f)).toBe(f);
+        expect(coerceSort('bogus')).toBe(DEFAULT_SORT);
+        expect(coerceSort(null)).toBe(DEFAULT_SORT);
+    });
+
+    it('coerceSort honors the legacy `recent` alias (== created), matching the API', () => {
+        // The backend maps sort=recent -> created; the browser must agree so a
+        // pasted/legacy `/?sort=recent` URL resolves to the same field.
+        expect(coerceSort('recent')).toBe('created');
+    });
+
+    it('coerceOrder accepts asc/desc and otherwise uses the field default', () => {
+        expect(coerceOrder('asc', 'title')).toBe('asc');
+        expect(coerceOrder('desc', 'title')).toBe('desc');
+        // Absent/invalid → field's natural default.
+        expect(coerceOrder(null, 'title')).toBe('asc');
+        expect(coerceOrder('sideways', 'updated')).toBe('desc');
+    });
+
+    it('omits sort/order from the URL when they equal the defaults', () => {
+        expect(sortUrlParams('updated', 'desc')).toEqual({});
+        // Title at its natural default (asc) → only the field is persisted.
+        expect(sortUrlParams('title', 'asc')).toEqual({ sort: 'title' });
+        // Non-default direction is persisted explicitly.
+        expect(sortUrlParams('title', 'desc')).toEqual({ sort: 'title', order: 'desc' });
+        expect(sortUrlParams('updated', 'asc')).toEqual({ order: 'asc' });
+    });
+
+    it('round-trips every field/order combo losslessly through the URL', () => {
+        for (const sort of FIELDS) {
+            for (const order of ORDERS) {
+                const params = sortUrlParams(sort, order);
+                const back = coerceSort(params.sort ?? null);
+                const backOrder = coerceOrder(params.order ?? null, back);
+                expect({ sort: back, order: backOrder }).toEqual({ sort, order });
+            }
+        }
+    });
+});

frontend/src/lib/mangaSort.ts

@@ -0,0 +1,83 @@
+import type { MangaSort, SortOrder } from './api/mangas';
+
+/// The catalog's default sort field. A bare `/?` (no `sort`) means this.
+export const DEFAULT_SORT: MangaSort = 'updated';
+
+export const SORT_FIELD_LABELS: Record<MangaSort, string> = {
+    updated: 'Last updated',
+    created: 'Date added',
+    title: 'Title',
+    author: 'Author'
+};
+
+/** Text fields sort A→Z by default; date fields newest-first. */
+export function isTextField(f: MangaSort): boolean {
+    return f === 'title' || f === 'author';
+}
+
+/**
+ * The direction applied when `order` is omitted. This mirrors the backend's
+ * `SortField::default_order` (backend/src/repo/manga.rs) on purpose: a bare
+ * `?sort=<field>` link must read the same in the UI and over the wire.
+ */
+export function defaultOrderFor(f: MangaSort): SortOrder {
+    return isTextField(f) ? 'asc' : 'desc';
+}
+
+/** The asc/desc toggle options, labelled for the field type. */
+export function dirOptions(f: MangaSort): { label: string; value: SortOrder }[] {
+    return isTextField(f)
+        ? [
+              { label: 'A→Z', value: 'asc' },
+              { label: 'Z→A', value: 'desc' }
+          ]
+        : [
+              { label: 'Newest', value: 'desc' },
+              { label: 'Oldest', value: 'asc' }
+          ];
+}
+
+export function dirLabel(sort: MangaSort, order: SortOrder): string {
+    return dirOptions(sort).find((o) => o.value === order)?.label ?? '';
+}
+
+export function sortLabel(sort: MangaSort, order: SortOrder): string {
+    return `${SORT_FIELD_LABELS[sort]} · ${dirLabel(sort, order)}`;
+}
+
+/**
+ * Coerce a raw `sort` query value to a valid field, falling back to default.
+ * `recent` is honored as the same back-compat alias the API exposes (== the
+ * `created` field), so a hand-shared or legacy `/?sort=recent` URL resolves to
+ * the same field in the browser as over the wire.
+ */
+export function coerceSort(raw: string | null | undefined): MangaSort {
+    if (raw === 'recent') return 'created';
+    return raw === 'created' || raw === 'updated' || raw === 'title' || raw === 'author'
+        ? raw
+        : DEFAULT_SORT;
+}
+
+/**
+ * Coerce a raw `order` query value, falling back to the field's natural
+ * default when absent or invalid — mirroring how {@link sortUrlParams} omits it.
+ */
+export function coerceOrder(raw: string | null | undefined, sort: MangaSort): SortOrder {
+    return raw === 'asc' || raw === 'desc' ? raw : defaultOrderFor(sort);
+}
+
+/**
+ * The `sort`/`order` params to persist in the shareable URL. Defaults are
+ * omitted to keep the common URL clean; because the backend resolves an absent
+ * `order` to {@link defaultOrderFor} too, the omission is unambiguous across
+ * the UI and direct API callers.
+ */
+export function sortUrlParams(
+    sort: MangaSort,
+    order: SortOrder
+): { sort?: MangaSort; order?: SortOrder } {
+    const out: { sort?: MangaSort; order?: SortOrder } = {};
+    if (sort !== DEFAULT_SORT) out.sort = sort;
+    if (order !== defaultOrderFor(sort)) out.order = order;
+    return out;
+}

frontend/src/routes/+page.svelte

@@ -7,13 +7,25 @@
         listMangas,
         type MangaCard as MangaCardData,
         type MangaSort,
+        type SortOrder,
         type MangaStatus
     } from '$lib/api/mangas';
     import { listGenres, type Genre } from '$lib/api/genres';
     import { listTags, type Tag } from '$lib/api/tags';
+    import {
+        DEFAULT_SORT,
+        SORT_FIELD_LABELS,
+        defaultOrderFor,
+        dirOptions as dirOptionsFor,
+        coerceSort,
+        coerceOrder,
+        sortLabel as composeSortLabel,
+        sortUrlParams
+    } from '$lib/mangaSort';
     import Chip from '$lib/components/Chip.svelte';
     import MangaCard from '$lib/components/MangaCard.svelte';
     import Pager from '$lib/components/Pager.svelte';
+    import SegmentedControl from '$lib/components/SegmentedControl.svelte';
     import Sheet from '$lib/components/Sheet.svelte';
     import Search from '@lucide/svelte/icons/search';
     import SlidersHorizontal from '@lucide/svelte/icons/sliders-horizontal';
@@ -25,7 +37,8 @@
 
     let mangas: MangaCardData[] = $state([]);
     let search = $state('');
-    let sort = $state<MangaSort>('recent');
+    let sort = $state<MangaSort>(DEFAULT_SORT);
+    let order = $state<SortOrder>(defaultOrderFor(DEFAULT_SORT));
     let statusFilter = $state<'' | MangaStatus>('');
     let selectedGenres = $state<Genre[]>([]);
     let selectedTags = $state<Tag[]>([]);
@@ -55,7 +68,12 @@
         (statusFilter ? 1 : 0) + selectedGenres.length + selectedTags.length
     );
 
-    const sortLabel = $derived(sort === 'title' ? 'Title (A→Z)' : 'Recent');
+    // Field/direction labelling and defaults live in $lib/mangaSort (unit
+    // tested there). Date fields read newest-first; text fields A→Z. The
+    // direction stays freely togglable — defaultOrderFor only picks the
+    // direction applied when the field changes.
+    const dirOptions = $derived(dirOptionsFor(sort));
+    const sortLabel = $derived(composeSortLabel(sort, order));
 
     const totalPages = $derived(
         total != null && total > 0 ? Math.ceil(total / PAGE_SIZE) : 1
@@ -76,6 +94,7 @@
                 genreIds: selectedGenres.map((g) => g.id),
                 tagIds: selectedTags.map((t) => t.id),
                 sort,
+                order,
                 limit: PAGE_SIZE,
                 offset: (currentPage - 1) * PAGE_SIZE
             });
@@ -92,7 +111,11 @@
         if (!browser) return;
         const params = new URLSearchParams();
         if (search.trim()) params.set('q', search.trim());
-        if (sort !== 'recent') params.set('sort', sort);
+        // Defaults are omitted to keep the URL clean; the backend resolves an
+        // absent `sort`/`order` the same way, so the omission is unambiguous.
+        const sp = sortUrlParams(sort, order);
+        if (sp.sort) params.set('sort', sp.sort);
+        if (sp.order) params.set('order', sp.order);
         if (statusFilter) params.set('status', statusFilter);
         if (selectedGenres.length)
             params.set('genres', selectedGenres.map((g) => g.id).join(','));
@@ -126,8 +149,10 @@
         // Genre objects so the chip rows render real labels.
         const url = new URL($page.url);
         search = url.searchParams.get('q') ?? '';
-        const s = url.searchParams.get('sort');
-        if (s === 'title' || s === 'recent') sort = s;
+        sort = coerceSort(url.searchParams.get('sort'));
+        // Fall back to the field's natural default when `order` is absent or
+        // invalid, mirroring how syncUrl omits the default.
+        order = coerceOrder(url.searchParams.get('order'), sort);
         const st = url.searchParams.get('status');
         statusFilter = st === 'ongoing' || st === 'completed' ? st : '';
         const genreIds = (url.searchParams.get('genres') ?? '')
@@ -166,6 +191,15 @@
     }
 
     function onSortChange() {
+        // Changing the field snaps the direction back to that field's natural
+        // default (dates → Newest, text → A→Z); the user can flip afterwards.
+        order = defaultOrderFor(sort);
+        resetAndReload();
+    }
+
+    function pickOrder(next: SortOrder) {
+        if (next === order) return;
+        order = next;
         resetAndReload();
     }
 
@@ -249,12 +283,12 @@
     }
 
     function pickSort(next: MangaSort) {
-        if (next === sort) {
-            sortSheetOpen = false;
-            return;
-        }
+        if (next === sort) return;
         sort = next;
-        sortSheetOpen = false;
+        // Match desktop: snap to the field's natural direction. The sheet
+        // stays open so the user can also adjust the direction before
+        // dismissing it.
+        order = defaultOrderFor(sort);
         resetAndReload();
     }
 
@@ -504,10 +538,22 @@
         <label class="sort">
             <span>Sort</span>
             <select bind:value={sort} onchange={onSortChange} data-testid="sort-select">
-                <option value="recent">Recent</option>
-                <option value="title">Title (A→Z)</option>
+                <option value="updated">Last updated</option>
+                <option value="created">Date added</option>
+                <option value="title">Title</option>
+                <option value="author">Author</option>
             </select>
         </label>
+        <div class="sort">
+            <span>Direction</span>
+            <SegmentedControl
+                options={dirOptions}
+                value={order}
+                onchange={pickOrder}
+                ariaLabel="Sort direction"
+                testid="sort-order"
+            />
+        </div>
     </div>
 </form>
 
@@ -526,30 +572,44 @@
     onClose={() => (sortSheetOpen = false)}
     testid="sort-sheet"
 >
-    <div class="sort-options">
-        <label>
-            <input
-                type="radio"
-                name="sort-mobile"
-                value="recent"
-                aria-label="Recent"
-                checked={sort === 'recent'}
-                onchange={() => pickSort('recent')}
-            />
-            <span>Recent</span>
-        </label>
-        <label>
-            <input
-                type="radio"
-                name="sort-mobile"
-                value="title"
-                aria-label="Title (A→Z)"
-                checked={sort === 'title'}
-                onchange={() => pickSort('title')}
-            />
-            <span>Title (A→Z)</span>
-        </label>
+    <p id="sort-field-heading" class="sort-section-label">Sort by</p>
+    <div class="sort-options" role="radiogroup" aria-labelledby="sort-field-heading">
+        {#each Object.entries(SORT_FIELD_LABELS) as [value, label] (value)}
+            <label>
+                <input
+                    type="radio"
+                    name="sort-mobile"
+                    {value}
+                    aria-label={label}
+                    checked={sort === value}
+                    onchange={() => pickSort(value as MangaSort)}
+                />
+                <!-- aria-label duplicates the visible span text on purpose so
+                     the e2e getByRole('radio', { name }) lookup is stable. -->
+                <span>{label}</span>
+            </label>
+        {/each}
     </div>
+    <div class="sort-direction">
+        <p class="sort-section-label">Direction</p>
+        <SegmentedControl
+            options={dirOptions}
+            value={order}
+            onchange={pickOrder}
+            ariaLabel="Sort direction"
+            testid="sort-order-mobile"
+        />
+    </div>
+    {#snippet footer()}
+        <button
+            type="button"
+            class="primary"
+            onclick={() => (sortSheetOpen = false)}
+            data-testid="sort-done"
+        >
+            Done
+        </button>
+    {/snippet}
 </Sheet>
 
 {#if loading}
@@ -836,6 +896,32 @@
         cursor: pointer;
     }
 
+    .sort-direction {
+        margin-top: var(--space-3);
+        padding-top: var(--space-3);
+        border-top: 1px solid var(--border);
+    }
+
+    /* Section headings inside the mobile sort sheet ("Sort by" / "Direction")
+       so each group is visibly labelled, mirroring the desktop inline labels. */
+    .sort-section-label {
+        margin: 0 0 var(--space-2);
+        font-size: var(--font-sm);
+        font-weight: var(--weight-medium);
+        color: var(--text-muted);
+    }
+
+    .primary {
+        border: 1px solid var(--primary);
+        background: var(--primary);
+        color: var(--primary-contrast);
+    }
+
+    .primary:hover {
+        background: var(--primary-hover);
+        border-color: var(--primary-hover);
+    }
+
     .icon-btn {
         display: inline-flex;
         align-items: center;