Add cyan accent color to enhance website aesthetics

This update introduces a vibrant cyan accent color alongside the existing
blue, creating a more visually engaging design while maintaining the clean,
minimalist aesthetic.

Changes:
- Define custom cyan and blue accent colors in global.css using @theme
- Add gradient effect (blue to cyan) on h1 and h2 headings
- Add cyan accent border on code blocks for visual distinction
- Update Button component with cyan border on hover/active states
- Add gradient indicator for active navigation items
- Add colorful hover states to theme toggle icons
- Include smooth color transitions for improved UX

Both light and dark modes are fully supported with appropriate color variants.

CLAUDE.md

@@ -71,11 +71,13 @@ thiloho.github.io/
 ## Tech Stack Details
 
 ### Core Framework
+
 - **Astro 5.14.6**: Static site generator with component islands architecture
 - **TypeScript**: Strict mode enabled (`extends: "astro/tsconfigs/strict"`)
 - **Node.js**: ES Modules (`"type": "module"`)
 
 ### Styling
+
 - **Tailwind CSS 4.1.14**: Utility-first CSS framework
 - **@tailwindcss/typography**: Typography plugin for prose content
 - **Custom Fonts**:
@@ -86,6 +88,7 @@ thiloho.github.io/
   - **Tiempos Headline**: Serif variant for headlines (weights: 300-900)
 
 ### Markdown Processing
+
 - **markdown-it**: Markdown parser
 - **rehype-slug**: Automatically add IDs to headings
 - **rehype-autolink-headings**: Make headings linkable (wrap behavior)
@@ -93,16 +96,19 @@ thiloho.github.io/
 - **Syntax highlighting**: GitHub Dark theme via Shiki
 
 ### Content Management
+
 - **Content Collections**: Defined in `src/content.config.ts`
   - **blog**: Markdown files with frontmatter (title, description, pubDate, modDate)
   - **tracks**: JSON file with music track data (id, title, youtubeLink, artist, album)
 
 ### Integrations
+
 - **@astrojs/sitemap**: Automatic sitemap generation
 - **@astrojs/rss**: RSS feed support
 - **sanitize-html**: HTML sanitization
 
 ### Development Tools
+
 - **Prettier**: Code formatting with plugins for Astro and Tailwind
 - **Nix**: Development environment and server deployment
 
@@ -124,11 +130,13 @@ nix run .#deploy-server  # Deploy to remote NixOS server
 ```
 
 ### Starting Development
+
 1. Install dependencies: `npm install`
 2. Start dev server: `npm run dev`
 3. Open browser to `http://localhost:4321`
 
 ### Building for Production
+
 1. Run build: `npm run build`
 2. Output is in `dist/` directory
 3. Preview with: `npm run preview`
@@ -140,6 +148,7 @@ nix run .#deploy-server  # Deploy to remote NixOS server
 Blog posts are stored in `src/content/blog/` with each post in its own directory containing a `index.md` file.
 
 **Required frontmatter structure**:
+
 ```markdown
 ---
 title: "Your Post Title"
@@ -154,6 +163,7 @@ Write your blog post content using Markdown...
 ```
 
 **Blog post conventions**:
+
 - Each post lives in its own directory: `src/content/blog/post-slug/index.md`
 - Use kebab-case for directory names (e.g., `nixos-with-ext4-and-luks`)
 - Include high-quality images in the same directory as the post
@@ -163,6 +173,7 @@ Write your blog post content using Markdown...
 ### Adding Music Tracks
 
 Edit `src/content/tracks.json` following this schema:
+
 ```json
 {
   "id": 1,
@@ -176,23 +187,27 @@ Edit `src/content/tracks.json` following this schema:
 ## Code Conventions
 
 ### TypeScript
+
 - Use strict TypeScript configuration
 - Define types explicitly where needed
 - Leverage Astro's built-in type system
 
 ### Astro Components
+
 - Use `.astro` file extension
 - Component names should be PascalCase (e.g., `TableOfContents.astro`)
 - Place reusable components in `src/components/`
 - Use layouts for page templates (`src/layouts/`)
 
 ### Styling
+
 - Use Tailwind utility classes for styling
 - Custom styles go in `src/styles/global.css`
 - Follow the custom variant pattern: `@custom-variant dark (&:where(.dark, .dark *))`
 - Apply responsive design with Tailwind's breakpoint prefixes
 
 ### Formatting
+
 - Always run `npm run format` before committing
 - Prettier automatically formats:
   - Astro files (via `prettier-plugin-astro`)
@@ -200,6 +215,7 @@ Edit `src/content/tracks.json` following this schema:
 - Configuration is in `.prettierrc`
 
 ### File Naming
+
 - Components: PascalCase (e.g., `Header.astro`)
 - Pages: kebab-case or descriptive names (e.g., `index.astro`, `legal-disclosure.astro`)
 - Content directories: kebab-case (e.g., `nixos-with-ext4-and-luks`)
@@ -208,12 +224,14 @@ Edit `src/content/tracks.json` following this schema:
 ## Deployment
 
 ### GitHub Pages
+
 - **Automatic deployment** on push to `main` branch
 - Workflow file: `.github/workflows/deploy.yml`
 - Uses official Astro GitHub Action (`withastro/action@v3`)
 - Custom domain: thilohohlt.com (configured via `public/CNAME`)
 
 ### Deployment Process
+
 1. Push to `main` branch
 2. GitHub Actions builds the site
 3. Astro generates static files
@@ -221,6 +239,7 @@ Edit `src/content/tracks.json` following this schema:
 5. Site available at https://thilohohlt.com
 
 ### Build Configuration
+
 - Site URL: `https://thilohohlt.com` (defined in `astro.config.ts`)
 - Prefetch: All links are prefetched (`prefetchAll: true`)
 - Output: Static HTML/CSS/JS in `dist/`
@@ -230,12 +249,14 @@ Edit `src/content/tracks.json` following this schema:
 This repository includes Nix configuration for self-hosted services listed at https://thilohohlt.com/services.
 
 ### Nix Files
+
 - `flake.nix`: Main Nix flake configuration
 - `flake.lock`: Dependency lock file
 - `server/default.nix`: NixOS system configuration
 - `server/hardware-configuration.nix`: Hardware-specific settings
 
 ### Nix Workflows
+
 ```bash
 # Enter development shell (provides nixd, nixfmt)
 nix develop
@@ -252,7 +273,9 @@ nix run .#deploy-server
 ```
 
 ### IDE Support for Nix
+
 For NixOS option completions, use the `jnoortheen.nix-ide` VSCode extension with these settings:
+
 ```json
 {
   "nix.enableLanguageServer": true,
@@ -270,21 +293,25 @@ For NixOS option completions, use the `jnoortheen.nix-ide` VSCode extension with
 ## Key Features to Preserve
 
 ### Custom Rehype Plugins
+
 The `rehypeWrapTables` plugin wraps tables in scrollable divs for responsive design:
+
 ```typescript
 const rehypeWrapTables = () => {
   // Wraps tables in div.overflow-x-auto.max-w-full
   // Ensures tables are scrollable on mobile
-}
+};
 ```
 
 ### Markdown Configuration
+
 - Syntax highlighting: GitHub Dark theme
 - Auto-generated heading IDs (via rehype-slug)
 - Clickable headings that wrap content (via rehype-autolink-headings)
 - Tables wrapped for horizontal scrolling
 
 ### Font Loading
+
 - All fonts use `font-display: swap` for performance
 - Fonts are self-hosted in `/public/fonts/`
 - Font families defined in `src/styles/global.css`
@@ -303,12 +330,14 @@ const rehypeWrapTables = () => {
 ### Common Tasks
 
 **Adding a new blog post**:
+
 1. Create directory in `src/content/blog/` with kebab-case name
 2. Add `index.md` with proper frontmatter
 3. Write content using Markdown
 4. Test with `npm run dev`
 
 **Modifying a component**:
+
 1. Read the component file first
 2. Understand its usage across the site
 3. Make targeted changes
@@ -316,12 +345,14 @@ const rehypeWrapTables = () => {
 5. Format with Prettier
 
 **Updating styles**:
+
 1. Check `src/styles/global.css` for existing patterns
 2. Use Tailwind utilities when possible
 3. Add custom CSS only when necessary
 4. Maintain dark mode support via custom variant
 
 **Working with NixOS configuration**:
+
 1. Changes to server config go in `server/` directory
 2. Always validate with `nix run .#eval-server` before deploying
 3. Be cautious with production server changes
@@ -340,22 +371,26 @@ const rehypeWrapTables = () => {
 ## Troubleshooting
 
 ### Build Fails
+
 - Check `astro.config.ts` for syntax errors
 - Verify all blog posts have required frontmatter
 - Ensure TypeScript types are correct
 - Run `npm install` to update dependencies
 
 ### Dev Server Issues
+
 - Port 4321 might be in use (kill the process or use `--port` flag)
 - Clear `.astro/` directory and rebuild: `rm -rf .astro && npm run dev`
 - Check for TypeScript errors in components
 
 ### Styling Problems
+
 - Run `npm run format` to fix Tailwind class ordering
 - Check global.css for font loading issues
 - Verify Tailwind plugin is loaded in Vite config
 
 ### Content Not Appearing
+
 - Verify content collection schema in `src/content.config.ts`
 - Check frontmatter matches schema requirements
 - Ensure file paths are correct

package-lock.json

@@ -4582,7 +4582,6 @@
       "integrity": "sha512-I7AIg5boAr5R0FFtJ6rCfD+LFsWHp81dolrFD8S79U9tb8Az2nGrJncnMSnys+bpQJfRUzqs9hnA81OAA3hCuQ==",
       "dev": true,
       "license": "MIT",
-      "peer": true,
       "bin": {
         "prettier": "bin/prettier.cjs"
       },
@@ -4599,7 +4598,6 @@
       "integrity": "sha512-RiBETaaP9veVstE4vUwSIcdATj6dKmXljouXc/DDNwBSPTp8FRkLGDSGFClKsAFeeg+13SB0Z1JZvbD76bigJw==",
       "dev": true,
       "license": "MIT",
-      "peer": true,
       "dependencies": {
         "@astrojs/compiler": "^2.9.1",
         "prettier": "^3.0.0",
@@ -5030,7 +5028,6 @@
       "resolved": "https://registry.npmjs.org/rollup/-/rollup-4.40.0.tgz",
       "integrity": "sha512-Noe455xmA96nnqH5piFtLobsGbCij7Tu+tb3c1vYjNbTkfzGqXqQXG3wJaYXkRZuQ0vEYN4bhwg7QnIrqB5B+w==",
       "license": "MIT",
-      "peer": true,
       "dependencies": {
         "@types/estree": "1.0.7"
       },
@@ -5325,8 +5322,7 @@
       "version": "4.1.14",
       "resolved": "https://registry.npmjs.org/tailwindcss/-/tailwindcss-4.1.14.tgz",
       "integrity": "sha512-b7pCxjGO98LnxVkKjaZSDeNuljC4ueKUddjENJOADtubtdo8llTaJy7HwBMeLNSSo2N5QIAgklslK1+Ir8r6CA==",
-      "license": "MIT",
+      "license": "MIT"
-      "peer": true
     },
     "node_modules/tapable": {
       "version": "2.3.0",
@@ -5810,7 +5806,6 @@
       "resolved": "https://registry.npmjs.org/vite/-/vite-6.4.1.tgz",
       "integrity": "sha512-+Oxm7q9hDoLMyJOYfUYBuHQo+dkAloi33apOPP56pzj+vsdJDzr+j1NISE5pyaAuKL4A3UD34qd0lx5+kfKp2g==",
       "license": "MIT",
-      "peer": true,
       "dependencies": {
         "esbuild": "^0.25.0",
         "fdir": "^6.4.4",
@@ -6018,7 +6013,6 @@
       "resolved": "https://registry.npmjs.org/zod/-/zod-3.25.76.tgz",
       "integrity": "sha512-gzUt/qt81nXsFGKIFcC3YnfEAx5NkunCfnDlvuBSSFS02bcXu4Lmea0AFIUwbLWxWPx3d9p8S5QoaujKcNQxcQ==",
       "license": "MIT",
-      "peer": true,
       "funding": {
         "url": "https://github.com/sponsors/colinhacks"
       }

src/components/Button.astro

@@ -9,7 +9,7 @@ interface Props {
 const { href, variant = "text", title, id } = Astro.props;
 
 const baseClasses =
-  "border-transparent border-b-2 p-2 cursor-pointer hover:border-neutral-300 hover:bg-neutral-200 hover:dark:border-neutral-600 hover:dark:bg-neutral-700 active:bg-neutral-200 active:dark:bg-neutral-700 active:border-neutral-300 active:dark:border-neutral-600";
+  "border-transparent border-b-2 p-2 cursor-pointer hover:border-[var(--color-accent-cyan)] hover:bg-neutral-200 hover:dark:border-[var(--color-accent-cyan-light)] hover:dark:bg-neutral-700 active:bg-neutral-200 active:dark:bg-neutral-700 active:border-[var(--color-accent-cyan)] active:dark:border-[var(--color-accent-cyan-light)] transition-colors duration-200";
 const classes = `${baseClasses} ${variant === "icon" && href ? "inline-grid place-content-center" : "inline-block"}`;
 ---
 

src/components/Nav.astro

@@ -4,6 +4,7 @@ import Icon from "./Icon.astro";
 import Button from "./Button.astro";
 
 const routes = ["blog", "tracks", "services"];
+const currentPath = Astro.url.pathname;
 ---
 
 <nav class="sticky top-0 z-20 max-w-none bg-white dark:bg-neutral-800">
@@ -15,18 +16,32 @@ const routes = ["blog", "tracks", "services"];
     </a>
     <div class="flex overflow-x-auto">
       {
-        routes.map((route) => (
+        routes.map((route) => {
+          const isActive = currentPath.startsWith(`/${route}`);
+          return (
+            <span class="relative">
               <Button href={`/${route}`}>
                 {route
                   .split(" ")
                   .map((word) => word.charAt(0).toUpperCase() + word.slice(1))
                   .join(" ")}
               </Button>
-        ))
+              {isActive && (
+                <span class="absolute right-0 bottom-0 left-0 h-0.5 bg-gradient-to-r from-[var(--color-accent-blue)] to-[var(--color-accent-cyan)] dark:from-[var(--color-accent-blue-light)] dark:to-[var(--color-accent-cyan-light)]" />
+              )}
+            </span>
+          );
+        })
       }
       <Button id="theme-toggle" variant="icon" title="Toggle dark mode">
-        <Icon name="moon" class="dark:hidden" />
+        <Icon
-        <Icon name="sun" class="hidden dark:block" />
+          name="moon"
+          class="transition-colors duration-200 hover:text-[var(--color-accent-cyan)] dark:hidden"
+        />
+        <Icon
+          name="sun"
+          class="hidden transition-colors duration-200 hover:text-[var(--color-accent-cyan-light)] dark:block"
+        />
       </Button>
       <Button variant="icon" href="/rss.xml" title="RSS feed">
         <Icon name="rss" />

src/styles/global.css

@@ -2,6 +2,13 @@
 @plugin "@tailwindcss/typography";
 @custom-variant dark (&:where(.dark, .dark *));
 
+@theme {
+  --color-accent-cyan: #0891b2;
+  --color-accent-cyan-light: #67e8f9;
+  --color-accent-blue: #1e40af;
+  --color-accent-blue-light: #93c5fd;
+}
+
 @layer base {
   body {
     font-family: "Tiempos Text", serif;
@@ -16,6 +23,32 @@
     font-family: "Styrene A", sans-serif;
   }
 
+  /* Gradient effect on h1 and h2 */
+  h1,
+  h2 {
+    background: linear-gradient(
+      135deg,
+      var(--color-accent-blue) 0%,
+      var(--color-accent-cyan) 100%
+    );
+    background-clip: text;
+    -webkit-background-clip: text;
+    -webkit-text-fill-color: transparent;
+    background-size: 100%;
+  }
+
+  .dark h1,
+  .dark h2 {
+    background: linear-gradient(
+      135deg,
+      var(--color-accent-blue-light) 0%,
+      var(--color-accent-cyan-light) 100%
+    );
+    background-clip: text;
+    -webkit-background-clip: text;
+    -webkit-text-fill-color: transparent;
+  }
+
   code,
   kbd,
   samp,
@@ -24,6 +57,15 @@
     font-family: "Styrene B", monospace;
   }
 
+  /* Accent border on code blocks */
+  pre {
+    border-left: 4px solid var(--color-accent-cyan);
+  }
+
+  .dark pre {
+    border-left-color: var(--color-accent-cyan-light);
+  }
+
   mark {
     @apply bg-neutral-200 text-current dark:bg-neutral-600;
   }