diff --git a/app/generator/data/technologies.responsive-breakpoints.test.ts b/app/generator/data/technologies.responsive-breakpoints.test.ts
new file mode 100644
index 000000000..5b79d06d7
--- /dev/null
+++ b/app/generator/data/technologies.responsive-breakpoints.test.ts
@@ -0,0 +1,190 @@
+import '@testing-library/jest-dom/vitest';
+import React from 'react';
+import { cleanup, fireEvent, render, screen, within } from '@testing-library/react';
+import { afterEach, beforeEach, describe, expect, it, vi } from 'vitest';
+import { TechnologiesSection } from '../components/sections/TechnologiesSection';
+import { TECHNOLOGIES, TECH_CATEGORIES, getTechById } from './technologies';
+
+vi.mock('lucide-react', () => ({
+  ChevronDown: (props: Record<string, unknown>) =>
+    React.createElement('svg', { 'data-testid': 'chevron-down-icon', ...props }),
+  Search: (props: Record<string, unknown>) =>
+    React.createElement('svg', { 'data-testid': 'search-icon', ...props }),
+  X: (props: Record<string, unknown>) =>
+    React.createElement('svg', { 'data-testid': 'x-icon', ...props }),
+}));
+
+vi.mock('next/image', () => ({
+  default: (props: Record<string, unknown>) => React.createElement('img', props),
+}));
+
+const MOBILE_VIEWPORT = {
+  width: 375,
+  height: 667,
+};
+
+type Viewport = typeof MOBILE_VIEWPORT;
+
+const setViewport = ({ width, height }: Viewport) => {
+  Object.defineProperty(window, 'innerWidth', {
+    writable: true,
+    configurable: true,
+    value: width,
+  });
+
+  Object.defineProperty(window, 'innerHeight', {
+    writable: true,
+    configurable: true,
+    value: height,
+  });
+
+  Object.defineProperty(window, 'matchMedia', {
+    writable: true,
+    configurable: true,
+    value: vi.fn().mockImplementation((query: string) => {
+      const maxWidth = query.match(/\(max-width:\s*(\d+)px\)/);
+      const minWidth = query.match(/\(min-width:\s*(\d+)px\)/);
+
+      return {
+        matches:
+          (!maxWidth || width <= Number(maxWidth[1])) &&
+          (!minWidth || width >= Number(minWidth[1])),
+        media: query,
+        onchange: null,
+        addListener: vi.fn(),
+        removeListener: vi.fn(),
+        addEventListener: vi.fn(),
+        removeEventListener: vi.fn(),
+        dispatchEvent: vi.fn(),
+      };
+    }),
+  });
+};
+
+describe('technologies - Responsive Multi-device Columns & Mobile Viewport Layouts', () => {
+  beforeEach(() => {
+    vi.clearAllMocks();
+    setViewport(MOBILE_VIEWPORT);
+  });
+
+  afterEach(() => {
+    cleanup();
+  });
+
+  const renderTechnologiesSection = (selected: string[] = [], onChange = vi.fn()) => {
+    render(React.createElement(TechnologiesSection, { selected, onChange }));
+
+    return {
+      onChange,
+      section: document.querySelector('#technologies-section') as HTMLElement,
+    };
+  };
+
+  const getTechnologyButton = (id: string) => {
+    const technology = getTechById(id);
+    expect(technology).toBeDefined();
+
+    const button = screen.getAllByRole('button').find((button) => {
+      const normalizedText = (button.textContent ?? '').replace(/\s/g, '');
+      const expectedText = `${technology?.name}${technology?.category}`.replace(/\s/g, '');
+
+      return button.className.includes('w-full') && normalizedText === expectedText;
+    });
+
+    expect(button).toBeDefined();
+    return button!;
+  };
+
+  const getTechnologyButtons = () =>
+    screen
+      .getAllByRole('button')
+      .filter(
+        (button) =>
+          button.className.includes('w-full') &&
+          button.className.includes('px-3') &&
+          button.className.includes('rounded-xl')
+      );
+
+  it('renders the real technology catalog under standard 375px mobile coordinates', () => {
+    const { section } = renderTechnologiesSection();
+
+    expect(window.innerWidth).toBe(375);
+    expect(window.innerHeight).toBe(667);
+    expect(window.matchMedia('(max-width: 640px)').matches).toBe(true);
+    expect(section).toBeInTheDocument();
+    expect(
+      screen.getByText(new RegExp(`^${TECHNOLOGIES.length}\\s+technologies$`))
+    ).toBeInTheDocument();
+    expect(getTechnologyButton('javascript')).toBeInTheDocument();
+  });
+
+  it('renders technology columns as the real one-column vertical mobile list', () => {
+    const { section } = renderTechnologiesSection();
+    const list = section.querySelector('.grid.grid-cols-1.gap-1.max-h-72');
+
+    expect(list).toBeInTheDocument();
+    expect(list).toHaveClass('grid', 'grid-cols-1', 'gap-1', 'overflow-y-auto');
+    expect(
+      within(list as HTMLElement)
+        .getByText('JavaScript')
+        .closest('button')
+    ).toHaveClass('flex', 'items-center', 'w-full', 'text-left');
+  });
+
+  it('uses fluid real row and input classes instead of absolute widths that cause mobile overflow', () => {
+    renderTechnologiesSection();
+
+    const searchInput = screen.getByPlaceholderText('Search technologies...');
+    const technologyButtons = getTechnologyButtons();
+    const combinedClasses = [
+      searchInput.className,
+      ...technologyButtons.map((button) => button.className),
+    ].join(' ');
+
+    expect(searchInput).toHaveClass('w-full');
+    expect(technologyButtons.length).toBe(TECHNOLOGIES.length);
+    technologyButtons.forEach((button) => {
+      expect(button).toHaveClass('w-full');
+      expect(button.getAttribute('style')).toBeNull();
+    });
+    expect(combinedClasses).not.toMatch(/\bw-screen\b/);
+    expect(combinedClasses).not.toMatch(/\bmin-w-screen\b/);
+    expect(combinedClasses).not.toMatch(/\bw-\[\d+(px|rem|vw)\]/);
+  });
+
+  it('renders real category navigation as wrapping compact mobile controls', () => {
+    const { section } = renderTechnologiesSection();
+    const categoryNav = section.querySelector('.flex.flex-wrap.gap-1\\.5.mb-4');
+    const categoryButtons = ['All', ...TECH_CATEGORIES].map((category) =>
+      screen.getByRole('button', { name: category })
+    );
+
+    expect(categoryNav).toBeInTheDocument();
+    expect(categoryNav).toHaveClass('flex', 'flex-wrap', 'overflow-x-auto');
+    expect(categoryButtons).toHaveLength(TECH_CATEGORIES.length + 1);
+    categoryButtons.forEach((button) => {
+      expect(button).toHaveClass('px-2.5', 'py-1', 'text-[11px]', 'whitespace-nowrap');
+    });
+  });
+
+  it('responds to real mobile technology toggle states with valid catalog IDs', () => {
+    const { onChange } = renderTechnologiesSection();
+    const reactButton = getTechnologyButton('react');
+
+    fireEvent.click(reactButton);
+
+    expect(onChange).toHaveBeenCalledTimes(1);
+    expect(onChange).toHaveBeenCalledWith(['react']);
+
+    cleanup();
+    renderTechnologiesSection(['react']);
+
+    expect(screen.getByText('Selected (1)')).toBeInTheDocument();
+    expect(screen.getByText('Clear all')).toBeInTheDocument();
+    expect(getTechnologyButton('react')).toHaveClass(
+      'bg-emerald-500/15',
+      'border',
+      'text-emerald-700'
+    );
+  });
+});