feat: add Link secondary variant with border-bottom at sm+

Secondary variant drops text-decoration, uses opacity-60/hover-100
and brutal-border-bottom at sm+ for use in icon+label links where
the underline should only appear alongside the label.

src/shared/ui/Link/ui/Link/Link.stories.tsx

@@ -10,31 +10,50 @@ export default meta;
 
 type Story = StoryObj<typeof Link>;
 
-export const Internal: Story = {
+const decorator = (Story: React.ComponentType) => (
+  <div className="p-8 bg-cream">
+    <Story />
+  </div>
+);
+
+export const Primary: Story = {
   args: {
     href: '/about',
     children: 'Internal page',
   },
-  decorators: [
-    (Story) => (
-      <div className="p-8 bg-cream">
-        <Story />
-      </div>
-    ),
-  ],
+  decorators: [decorator],
 };
 
-export const External: Story = {
+export const PrimaryExternal: Story = {
   args: {
     href: 'https://example.com',
     external: true,
     children: 'External site',
   },
-  decorators: [
-    (Story) => (
-      <div className="p-8 bg-cream">
-        <Story />
-      </div>
-    ),
-  ],
+  decorators: [decorator],
+};
+
+export const Secondary: Story = {
+  args: {
+    href: 'https://github.com',
+    external: true,
+    variant: 'secondary',
+    children: 'GitHub',
+  },
+  decorators: [decorator],
+};
+
+export const SecondaryWithIcon: Story = {
+  args: {
+    href: 'https://github.com',
+    external: true,
+    variant: 'secondary',
+    className: 'flex items-center gap-1.5 text-sm',
+    children: (
+      <>
+        <span className="hidden sm:block">GitHub</span>
+      </>
+    ),
+  },
+  decorators: [decorator],
 };

src/shared/ui/Link/ui/Link/Link.test.tsx

@@ -10,7 +10,8 @@ import { render, screen } from '@testing-library/react';
 import type React from 'react';
 import { Link } from './Link';
 
-const BASE = 'underline underline-offset-2 hover:opacity-60 transition-opacity';
+const PRIMARY = 'underline underline-offset-2 hover:opacity-60 transition-opacity';
+const SECONDARY = 'no-underline opacity-60 hover:opacity-100 sm:brutal-border-bottom transition-opacity';
 
 describe('internal link', () => {
   it('renders an anchor element', () => {
@@ -28,10 +29,10 @@ describe('internal link', () => {
     expect(screen.getByRole('link', { name: 'About' })).not.toHaveAttribute('target');
   });
 
-  it('applies base classes', () => {
+  it('applies primary classes by default', () => {
     render(<Link href="/about">About</Link>);
     const link = screen.getByRole('link', { name: 'About' });
-    for (const cls of BASE.split(' ')) {
+    for (const cls of PRIMARY.split(' ')) {
       expect(link).toHaveClass(cls);
     }
   });
@@ -66,8 +67,43 @@ describe('external link', () => {
   });
 });
 
+describe('variant', () => {
+  it('primary applies underline classes', () => {
+    render(
+      <Link href="/about" variant="primary">
+        About
+      </Link>,
+    );
+    const link = screen.getByRole('link', { name: 'About' });
+    for (const cls of PRIMARY.split(' ')) {
+      expect(link).toHaveClass(cls);
+    }
+  });
+
+  it('secondary applies secondary classes', () => {
+    render(
+      <Link href="/about" variant="secondary">
+        About
+      </Link>,
+    );
+    const link = screen.getByRole('link', { name: 'About' });
+    for (const cls of SECONDARY.split(' ')) {
+      expect(link).toHaveClass(cls);
+    }
+  });
+
+  it('secondary does not apply underline', () => {
+    render(
+      <Link href="/about" variant="secondary">
+        About
+      </Link>,
+    );
+    expect(screen.getByRole('link', { name: 'About' })).not.toHaveClass('underline');
+  });
+});
+
 describe('className passthrough', () => {
-  it('merges custom className with base classes', () => {
+  it('merges custom className with variant classes', () => {
     render(
       <Link href="/about" className="text-red-500">
         Styled
@@ -75,7 +111,7 @@ describe('className passthrough', () => {
     );
     const link = screen.getByRole('link', { name: 'Styled' });
     expect(link).toHaveClass('text-red-500');
-    for (const cls of BASE.split(' ')) {
+    for (const cls of PRIMARY.split(' ')) {
       expect(link).toHaveClass(cls);
     }
   });

src/shared/ui/Link/ui/Link/Link.tsx

@@ -2,6 +2,8 @@ import NextLink from 'next/link';
 import type { ReactNode } from 'react';
 import { cn } from '$shared/lib';
 
+export type LinkVariant = 'primary' | 'secondary';
+
 /**
  * Props for Link.
  */
@@ -18,6 +20,13 @@ interface Props {
    * CSS classes
    */
   className?: string;
+  /**
+   * Visual variant.
+   * primary — text-decoration underline.
+   * secondary — border-bottom at sm+, no underline on mobile (for icon+label links).
+   * @default 'primary'
+   */
+  variant?: LinkVariant;
   /**
    * When true, renders a plain <a> with target="_blank" rel="noopener noreferrer".
    * Use for links that open outside the app.
@@ -25,22 +34,27 @@ interface Props {
   external?: boolean;
 }
 
-const BASE = 'underline underline-offset-2 hover:opacity-60 transition-opacity';
+const VARIANTS = {
+  primary: 'underline underline-offset-2 hover:opacity-60 transition-opacity',
+  secondary: 'no-underline opacity-60 hover:opacity-100 sm:brutal-border-bottom transition-opacity',
+} as const satisfies Record<LinkVariant, string>;
 
 /**
  * Inline text link.
  * Renders as Next.js Link for internal routes, plain <a> for external links.
  */
-export function Link({ href, children, className, external }: Props) {
+export function Link({ href, children, className, variant = 'primary', external }: Props) {
+  const cls = cn(VARIANTS[variant], className);
+
   if (external) {
     return (
-      <a href={href} target="_blank" rel="noopener noreferrer" className={cn(BASE, className)}>
+      <a href={href} target="_blank" rel="noopener noreferrer" className={cls}>
         {children}
       </a>
     );
   }
   return (
-    <NextLink href={href} className={cn(BASE, className)}>
+    <NextLink href={href} className={cls}>
       {children}
     </NextLink>
   );

src/shared/ui/index.ts

@@ -5,7 +5,9 @@ export { Button } from './Button';
 export type { CardBackground } from './Card';
 export { Card, CardContent, CardDescription, CardFooter, CardHeader, CardSidebar, CardTitle } from './Card';
 
+export { InlineSvg } from './InlineSvg';
 export { Input, Textarea } from './Input';
+export type { LinkVariant } from './Link';
 export { Link } from './Link';
 export { RichText } from './RichText';
 export type { ContainerSize, SectionBackground } from './Section';