diff --git a/.claude/settings.local.json b/.claude/settings.local.json
new file mode 100644
index 0000000..465e11e
--- /dev/null
+++ b/.claude/settings.local.json
@@ -0,0 +1,27 @@
+{
+  "permissions": {
+    "allow": [
+      "Bash(dist/linkbeam:*)",
+      "Bash(docker build:*)",
+      "Bash(go run:*)",
+      "Bash(go test -v ./...)",
+      "Bash(go test:*)",
+      "Bash(golangci-lint help:*)",
+      "Bash(golangci-lint run:*)",
+      "Bash(make:*)",
+      "Bash(sudo docker build:*)",
+      "Bash(docker compose:*)",
+      "Bash(sudo docker compose build:*)",
+      "Bash(sudo docker compose:*)",
+      "Bash(./dist/linkbeam:*)",
+      "Bash(tree:*)",
+      "Read(//tmp/**)",
+      "Bash(cat:*)",
+      "Bash(for file in internal/config/testdata/config-{nord,gruvbox,catppuccin}.yaml)",
+      "Bash(do)",
+      "Bash(done)"
+    ],
+    "deny": [],
+    "ask": []
+  }
+}
diff --git a/.gitea/workflows/ci.yml b/.gitea/workflows/ci.yml
index abf3ccd..ab22ae4 100644
--- a/.gitea/workflows/ci.yml
+++ b/.gitea/workflows/ci.yml
@@ -15,6 +15,7 @@ jobs:
   lint:
     name: Lint
     runs-on: ubuntu-latest
+    container: catthehacker/ubuntu:act-latest
     steps:
       - name: Checkout code
         uses: actions/checkout@v4
@@ -44,6 +45,7 @@ jobs:
   test:
     name: Test
     runs-on: ubuntu-latest
+    container: catthehacker/ubuntu:act-latest
     needs: lint
     steps:
       - name: Checkout code
@@ -71,6 +73,7 @@ jobs:
   build:
     name: Build
     runs-on: ubuntu-latest
+    container: catthehacker/ubuntu:act-latest
     needs: test
     strategy:
       matrix:
@@ -137,6 +140,7 @@ jobs:
   docker:
     name: Build Docker Image
     runs-on: ubuntu-latest
+    container: catthehacker/ubuntu:act-latest
     needs: test
     steps:
       - name: Checkout code
@@ -184,6 +188,7 @@ jobs:
   release:
     name: Create Release
     runs-on: ubuntu-latest
+    container: catthehacker/ubuntu:act-latest
     needs: [build, docker]
     if: github.event_name == 'push' && startsWith(github.ref, 'refs/tags/')
     steps:
diff --git a/.gitea/workflows/docker-publish.yml b/.gitea/workflows/docker-publish.yml
index d9af1b4..fe19ccd 100644
--- a/.gitea/workflows/docker-publish.yml
+++ b/.gitea/workflows/docker-publish.yml
@@ -14,6 +14,7 @@ jobs:
   build-and-push:
     name: Build and Push Docker Image
     runs-on: ubuntu-latest
+    container: catthehacker/ubuntu:act-latest
     permissions:
       contents: read
       packages: write
diff --git a/.gitea/workflows/release.yml b/.gitea/workflows/release.yml
index 305b480..ca9c123 100644
--- a/.gitea/workflows/release.yml
+++ b/.gitea/workflows/release.yml
@@ -9,6 +9,7 @@ jobs:
   create-release:
     name: Create Release
     runs-on: ubuntu-latest
+    container: catthehacker/ubuntu:act-latest
     outputs:
       upload_url: ${{ steps.create_release.outputs.upload_url }}
     steps:
@@ -43,6 +44,7 @@ jobs:
     name: Build and Upload Assets
     needs: create-release
     runs-on: ubuntu-latest
+    container: catthehacker/ubuntu:act-latest
     strategy:
       matrix:
         include:
diff --git a/CLAUDE.md b/CLAUDE.md
new file mode 100644
index 0000000..60deef4
--- /dev/null
+++ b/CLAUDE.md
@@ -0,0 +1,154 @@
+# CLAUDE.md
+
+This file provides guidance to Claude Code (claude.ai/code) when working with code in this repository.
+
+## Project Overview
+
+LinkBeam is a static site generator for creating personal link-in-bio pages (similar to Linktree). It reads a YAML configuration file containing user profile information, links, and social media, then generates a themed HTML page using Go templates.
+
+## CI/CD Pipeline
+
+The project uses Gitea Actions for continuous integration and deployment.
+
+### Workflows
+
+1. **CI Pipeline** (`.gitea/workflows/ci.yml`):
+   - Runs on push to main/develop and pull requests
+   - **Lint**: golangci-lint, go fmt, go vet
+   - **Test**: Run tests with race detection and coverage
+   - **Build**: Multi-platform builds (Linux, Windows, macOS) for amd64, 386, arm64, armv7
+   - **Docker**: Build multi-arch Docker images
+
+2. **Docker Publish** (`.gitea/workflows/docker-publish.yml`):
+   - Triggered on version tags (v*)
+   - Builds and pushes Docker images to container registry
+   - Multi-architecture: linux/amd64, linux/arm64, linux/arm/v7
+
+3. **Release** (`.gitea/workflows/release.yml`):
+   - Triggered on semver tags (v*.*.*)
+   - Creates GitHub/Gitea releases with binaries for all platforms
+   - Generates SHA256 checksums for verification
+
+### Local Testing
+
+```bash
+# Check version
+./linkbeam -v
+# or: ./linkbeam --version
+
+# Test Docker build
+docker build -t linkbeam:test .
+
+# Run Docker container
+docker run -v $(pwd)/config.yaml:/app/config/config.yaml \
+           -v $(pwd)/dist:/app/dist \
+           linkbeam:test
+
+# Test with docker-compose
+docker-compose up
+```
+
+## Development Commands
+
+### Pre-commit Setup
+
+This project uses pre-commit hooks for code quality. First-time setup:
+
+```bash
+# Install pre-commit hooks
+make install-hooks
+# or: pre-commit install
+
+# Run all hooks manually
+make pre-commit
+# or: pre-commit run --all-files
+```
+
+The hooks automatically run on commit and check: `go fmt`, `goimports`, `go vet`, `golangci-lint`, `go test`, `go mod tidy`, YAML syntax, and more.
+
+### Building and Running
+```bash
+# Build binary (outputs to dist/linkbeam)
+make build
+# or: go build -o dist/linkbeam cmd/linkbeam/main.go
+
+# Run with example config
+make run-example
+# or: go run cmd/linkbeam/main.go --config internal/config/testdata/config.yaml
+
+# Run with custom config (long flags)
+./linkbeam --config config.yaml --template templates/base.html --output dist/index.html
+
+# Run with custom config (short flags)
+./linkbeam -c config.yaml -t templates/base.html -o dist/index.html
+
+# Run all tests
+make test
+# or: go test -v ./...
+
+# Run tests for a specific package
+go test ./internal/config
+go test ./internal/generator
+
+# Run a single test function
+go test -v -run TestLoad ./internal/config
+
+# Clean build artifacts
+make clean
+```
+
+### CLI Options
+- `-c, --config`: Path to config YAML file (default: "config.yaml")
+- `-t, --template`: Path to HTML template (default: "templates/base.html")
+- `-o, --output`: Path to output HTML file (default: "dist/index.html")
+- `-v, --version`: Print version information
+
+### Output
+The `dist/` directory contains both build artifacts and generated site:
+- `dist/linkbeam` - Compiled binary
+- `dist/index.html` - Main HTML page
+- `dist/themes/` - Copied CSS theme files
+
+## Architecture
+
+### Two-Layer Structure
+
+1. **Config Layer** (`internal/config/`):
+   - Loads and validates YAML configuration files
+   - Defines data structures: `Config`, `Link`, `Social`
+   - Validates theme (must be "light" or "dark") and required fields (name cannot be empty)
+   - Config validation happens automatically during `config.Load()`
+
+2. **Generator Layer** (`internal/generator/`):
+   - **HTML Generation**: Orchestrates template rendering using Go's `html/template`
+     - `GenerateSite(cfg, templatePath, outPath)` - Creates HTML from templates
+   - **Asset Management**: Copies CSS themes and static files to output directory
+     - `CopyAssets(distDir, themeDirs...)` - Copies theme files to dist/themes/
+   - **Text Rendering**: Plain-text representation for debugging
+     - `RenderUserPage(cfg)` - Returns text-based preview of the page
+
+### Configuration Format
+
+The config YAML structure in `internal/config/testdata/config.yaml`:
+- `name`: User's display name (required)
+- `bio`: Short biography text
+- `avatar`: Path to avatar image
+- `theme`: "light" or "dark" (validated)
+- `links[]`: Array of link objects with `title`, `url`, `icon`
+- `socials[]`: Array of social media links with `platform`, `url`, `icon`
+
+### Templates
+
+Templates in `templates/` use Go template syntax:
+- `base.html`: Main page template with theme support (`data-theme="{{ .Theme }}"`)
+- Template receives the entire `Config` struct as data
+- Access config fields with `{{ .Name }}`, `{{ .Bio }}`, etc.
+- Iterate over links with `{{- range .Links }}`
+
+### Testing Strategy
+
+- Tests use table-driven patterns and dependency injection
+- `cmd/linkbeam/main_test.go`: Mocks the config loader and captures stdout
+- Config tests validate YAML parsing and business rules
+- Generator tests verify file creation and template execution
+- All tests use the testdata in `internal/config/testdata/config.yaml`
diff --git a/HTML Theme Switcher Implementation.md b/HTML Theme Switcher Implementation.md
new file mode 100644
index 0000000..1dcfa19
--- /dev/null
+++ b/HTML Theme Switcher Implementation.md	
@@ -0,0 +1,162 @@
+
+
+## What It Does
+
+A three-option theme toggle (System/Light/Dark) that works reliably across all browsers.
+
+**Features:**
+- Cycles through: System (💡) → Light (☀️) → Dark (🌙)
+- Persists across page refreshes
+- Follows OS theme preference when "System" is selected
+- Works in private browsing mode
+- Mobile-friendly (icon-only)
+
+## The Solution
+
+### CSS
+
+Three separate rules that work together:
+
+```css
+/* Default: Light mode */
+:root {
+  --bg-primary: var(--nord-snow-storm-3);
+  --text-primary: var(--nord-polar-night-2);
+  /* ... */
+}
+
+/* System dark mode */
+@media (prefers-color-scheme: dark) {
+  :root {
+    --bg-primary: var(--nord-polar-night-1);
+    --text-primary: var(--nord-snow-storm-3);
+    /* ... */
+  }
+}
+
+/* Manual overrides (highest priority) */
+html[data-theme="dark"] {
+  --bg-primary: var(--nord-polar-night-1);
+  --text-primary: var(--nord-snow-storm-3);
+  /* ... */
+}
+
+html[data-theme="light"] {
+  --bg-primary: var(--nord-snow-storm-3);
+  --text-primary: var(--nord-polar-night-2);
+  /* ... */
+}
+```
+
+**Why this works:** `html[data-theme]` has higher specificity than the media query, so manual selection always overrides system preference.
+
+### JavaScript
+
+```javascript
+const THEME_OPTIONS = ['system', 'light', 'dark'];
+
+function toggleTheme() {
+    const current = getFromStorage('themePreference', 'system');
+    const nextIndex = (THEME_OPTIONS.indexOf(current) + 1) % 3;
+    const next = THEME_OPTIONS[nextIndex];
+
+    applyTheme(next);
+}
+
+function applyTheme(theme) {
+    // Update HTML attribute
+    if (theme === 'system') {
+        document.documentElement.removeAttribute('data-theme');
+    } else {
+        document.documentElement.setAttribute('data-theme', theme);
+    }
+
+    // Update UI
+    document.getElementById('themeIcon').textContent = THEME_ICONS[theme];
+    document.getElementById('themeLabel').textContent = THEME_LABELS[theme];
+
+    // Save preference
+    saveToStorage('themePreference', theme);
+}
+
+// Initialize on load
+initTheme();
+```
+
+### Storage Fallback
+
+Works even when localStorage is blocked:
+
+```javascript
+function getStorage() {
+    try {
+        localStorage.setItem('__test__', '1');
+        localStorage.removeItem('__test__');
+        return localStorage;
+    } catch {
+        return sessionStorage; // Fallback
+    }
+}
+```
+
+## Why It Works
+
+1. **System mode**: No `data-theme` attribute → media query applies
+2. **Light mode**: `data-theme="light"` → overrides media query
+3. **Dark mode**: `data-theme="dark"` → overrides media query
+
+## Firefox Fix
+
+**Problem:** Initial implementation had invalid CSS:
+```css
+/* ❌ Invalid */
+html[data-theme="dark"],
+@media (prefers-color-scheme: dark) { ... }
+```
+
+**Solution:** Separate rules:
+```css
+/* ✅ Valid */
+@media (prefers-color-scheme: dark) {
+  :root { ... }
+}
+
+html[data-theme="dark"] { ... }
+```
+
+## Tests
+
+12 unit tests verify:
+- Theme storage/retrieval
+- localStorage → sessionStorage fallback
+- All three theme options work
+
+Run: `npm test`
+
+## Available Themes
+
+LinkBeam includes the following themes with automatic light/dark switching:
+
+1. **auto** - Simple default theme
+2. **nord** - Nord color palette (light/dark variants)
+3. **gruvbox** - Gruvbox color palette (light/dark variants)
+4. **catppuccin-latte** - Catppuccin Latte → Mocha (light → dark)
+5. **catppuccin-frappe** - Catppuccin Latte → Frappé (light → dark)
+6. **catppuccin-macchiato** - Catppuccin Latte → Macchiato (light → dark)
+7. **catppuccin-mocha** - Catppuccin Latte → Mocha (light → dark)
+
+All themes follow the same CSS structure with:
+- Default light mode colors in `:root`
+- Dark mode colors in `@media (prefers-color-scheme: dark)`
+- Manual overrides via `html[data-theme="light|dark"]`
+
+## Files
+
+- `templates/base.html` - Theme switcher button and script
+- `themes/*.css` - Theme CSS files with light/dark variants
+- `internal/config/config.go` - Auto-discovers available themes
+
+---
+
+**Status:** ✅ Working in all browsers
+**Last Updated:** 2025-10-12
diff --git a/config.example.yaml b/config.example.yaml
index 9570820..36eceb5 100644
--- a/config.example.yaml
+++ b/config.example.yaml
@@ -6,6 +6,7 @@ name: "Your Name"
 bio: "A short bio about yourself"
 avatar: "static/logo.png"  # Can be a local path or URL (http://... or https://...)
 theme: "auto"
+# font_awesome_cdn: "https://cdnjs.cloudflare.com/ajax/libs/font-awesome/6.5.1/css/all.min.css"  # Optional: custom Font Awesome CDN URL (default: Font Awesome 6.5.1)
 links:
   - title: "My Website"
     url: "https://yourwebsite.com"