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diff --git a/frontend-vanilla/src/main.test.ts b/frontend-vanilla/src/main.test.ts
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+++ b/frontend-vanilla/src/main.test.ts
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+import { describe, it, expect, vi, beforeEach } from 'vitest';
+import { store } from './store';
+import { router } from './router';
+import {
+    renderLayout,
+    renderFeeds,
+    renderTags,
+    renderFilters,
+    renderItems,
+    renderSettings,
+    fetchFeeds,
+    fetchTags,
+    fetchItems,
+    init,
+    logout
+} from './main';
+import { apiFetch } from './api';
+
+// Mock api
+vi.mock('./api', () => ({
+    apiFetch: vi.fn()
+}));
+
+// Mock IntersectionObserver
+const mockObserver = vi.fn(() => ({
+    observe: vi.fn(),
+    unobserve: vi.fn(),
+    disconnect: vi.fn(),
+}));
+vi.stubGlobal('IntersectionObserver', mockObserver);
+
+describe('main application logic', () => {
+    beforeEach(() => {
+        document.body.innerHTML = '<div id="app"></div>';
+        vi.stubGlobal('location', {
+            href: 'http://localhost/v3/',
+            pathname: '/v3/',
+            search: '',
+            assign: vi.fn(),
+            replace: vi.fn()
+        });
+        vi.stubGlobal('history', {
+            pushState: vi.fn()
+        });
+        // Mock scrollIntoView which is missing in JSDOM
+        Element.prototype.scrollIntoView = vi.fn();
+        vi.clearAllMocks();
+        // Reset store
+        store.setFeeds([]);
+        store.setTags([]);
+        store.setItems([]);
+
+        // Setup default auth response
+        vi.mocked(apiFetch).mockResolvedValue({
+            ok: true,
+            status: 200,
+            json: async () => []
+        } as Response);
+    });
+
+    it('renderLayout should create sidebar and main content', () => {
+        renderLayout();
+        expect(document.getElementById('sidebar')).not.toBeNull();
+        expect(document.getElementById('content-area')).not.toBeNull();
+        expect(document.getElementById('logo-link')).not.toBeNull();
+    });
+
+    it('renderFeeds should populate feed list', () => {
+        renderLayout();
+        store.setFeeds([{ _id: 1, title: 'Test Feed', url: 'test', web_url: 'test', category: 'tag' }]);
+        renderFeeds();
+        const feedList = document.getElementById('feed-list');
+        expect(feedList?.innerHTML).toContain('Test Feed');
+    });
+
+    it('renderTags should populate tag list', () => {
+        renderLayout();
+        store.setTags([{ title: 'Test Tag' } as any]);
+        renderTags();
+        const tagList = document.getElementById('tag-list');
+        expect(tagList?.innerHTML).toContain('Test Tag');
+    });
+
+    it('renderFilters should update active filter', () => {
+        renderLayout();
+        store.setFilter('starred');
+        renderFilters();
+        const starredFilter = document.querySelector('[data-filter="starred"]');
+        expect(starredFilter?.classList.contains('active')).toBe(true);
+    });
+
+    it('renderItems should populate content area', () => {
+        renderLayout();
+        store.setItems([{ _id: 1, title: 'Item 1', url: 'test', publish_date: '2023-01-01' } as any]);
+        renderItems();
+        const contentArea = document.getElementById('content-area');
+        expect(contentArea?.innerHTML).toContain('Item 1');
+    });
+
+    it('renderSettings should show theme and font options', () => {
+        renderLayout();
+        renderSettings();
+        expect(document.querySelector('.settings-view')).not.toBeNull();
+        expect(document.getElementById('font-selector')).not.toBeNull();
+    });
+
+    it('fetchFeeds should update store', async () => {
+        vi.mocked(apiFetch).mockResolvedValueOnce({
+            ok: true,
+            json: async () => [{ _id: 1, title: 'API Feed' }]
+        } as Response);
+
+        await fetchFeeds();
+        expect(store.feeds).toHaveLength(1);
+        expect(store.feeds[0].title).toBe('API Feed');
+    });
+
+    it('fetchTags should update store', async () => {
+        vi.mocked(apiFetch).mockResolvedValueOnce({
+            ok: true,
+            json: async () => [{ title: 'API Tag' }]
+        } as Response);
+
+        await fetchTags();
+        expect(store.tags).toHaveLength(1);
+        expect(store.tags[0].title).toBe('API Tag');
+    });
+
+    it('fetchItems should update store items', async () => {
+        vi.mocked(apiFetch).mockResolvedValueOnce({
+            ok: true,
+            json: async () => [{ _id: 1, title: 'API Item' }]
+        } as Response);
+
+        renderLayout();
+        await fetchItems();
+        expect(store.items).toHaveLength(1);
+        expect(store.items[0].title).toBe('API Item');
+    });
+
+    it('init should coordinate startup', async () => {
+        vi.mocked(apiFetch).mockResolvedValue({
+            ok: true,
+            status: 200,
+            json: async () => []
+        } as Response);
+
+        await init();
+        expect(document.getElementById('sidebar')).not.toBeNull();
+    });
+
+    it('should handle search input', () => {
+        renderLayout();
+        const searchInput = document.getElementById('search-input') as HTMLInputElement;
+        const spy = vi.spyOn(router, 'updateQuery');
+        searchInput.value = 'query';
+        searchInput.dispatchEvent(new Event('input'));
+        expect(spy).toHaveBeenCalledWith({ q: 'query' });
+    });
+
+    it('should handle sidebar navigation clicking', () => {
+        renderLayout();
+        const spy = vi.spyOn(router, 'updateQuery');
+        const filterLink = document.querySelector('[data-nav="filter"]') as HTMLElement;
+        filterLink.click();
+        expect(spy).toHaveBeenCalled();
+    });
+
+    it('should handle item star toggle', async () => {
+        renderLayout();
+        const mockItem = { _id: 1, title: 'Item 1', starred: false, publish_date: '2023-01-01' } as any;
+        store.setItems([mockItem]);
+        renderItems();
+
+        vi.mocked(apiFetch).mockResolvedValue({ ok: true } as Response);
+
+        const starBtn = document.querySelector('[data-action="toggle-star"]') as HTMLElement;
+        starBtn.click();
+
+        expect(apiFetch).toHaveBeenCalledWith(expect.stringContaining('/api/item/1'), expect.objectContaining({
+            method: 'PUT',
+            body: expect.stringContaining('"starred":true')
+        }));
+    });
+
+    it('should handle theme change in settings', () => {
+        renderLayout();
+        renderSettings();
+        const darkBtn = document.querySelector('[data-theme="dark"]') as HTMLElement;
+        const spy = vi.spyOn(store, 'setTheme');
+        darkBtn.click();
+        expect(spy).toHaveBeenCalledWith('dark');
+    });
+
+    it('should handle logout', async () => {
+        vi.mocked(apiFetch).mockResolvedValue({ ok: true } as Response);
+        await logout();
+        expect(apiFetch).toHaveBeenCalledWith('/api/logout', { method: 'POST' });
+        expect(window.location.href).toBe('/login/');
+    });
+
+    it('should handle keyboard navigation j/k', () => {
+        const mockItems = [
+            { _id: 1, title: 'Item 1', publish_date: '2023-01-01', read: false },
+            { _id: 2, title: 'Item 2', publish_date: '2023-01-01', read: false }
+        ] as any;
+        store.setItems(mockItems);
+        renderLayout();
+        renderItems();
+
+        window.dispatchEvent(new KeyboardEvent('keydown', { key: 'j' }));
+        expect(apiFetch).toHaveBeenCalled(); // mark as read
+
+        window.dispatchEvent(new KeyboardEvent('keydown', { key: 'k' }));
+        // should go back to first item
+    });
+
+    it('should handle toggle star/read with keyboard', async () => {
+        const mockItem = { _id: 1, title: 'Item 1', publish_date: '2023-01-01', read: true, starred: false } as any;
+        store.setItems([mockItem]);
+        renderLayout();
+        renderItems();
+
+        // Already read, so 'j' won't trigger updateItem for read=true
+        window.dispatchEvent(new KeyboardEvent('keydown', { key: 'j' }));
+
+        vi.mocked(apiFetch).mockResolvedValue({ ok: true } as Response);
+
+        // Toggle star
+        window.dispatchEvent(new KeyboardEvent('keydown', { key: 's' }));
+        expect(apiFetch).toHaveBeenCalledWith(expect.stringContaining('/api/item/1'), expect.objectContaining({
+            body: expect.stringContaining('"starred":true')
+        }));
+
+        // Toggle read (currently true -> false)
+        window.dispatchEvent(new KeyboardEvent('keydown', { key: 'r' }));
+        expect(apiFetch).toHaveBeenLastCalledWith(expect.stringContaining('/api/item/1'), expect.objectContaining({
+            body: expect.stringContaining('"read":false')
+        }));
+    });
+
+    it('should focus search with /', () => {
+        renderLayout();
+        const searchInput = document.getElementById('search-input') as HTMLInputElement;
+        const spy = vi.spyOn(searchInput, 'focus');
+        window.dispatchEvent(new KeyboardEvent('keydown', { key: '/' }));
+        expect(spy).toHaveBeenCalled();
+    });
+});