diff --git a/internal/modules/fonts/fonts.go b/internal/modules/fonts/fonts.go
new file mode 100644
index 0000000..9dc7c9c
--- /dev/null
+++ b/internal/modules/fonts/fonts.go
@@ -0,0 +1,82 @@
+// Package fonts installs AUR fonts via the yay helper.
+package fonts
+
+import (
+	"context"
+	"fmt"
+	"strings"
+
+	"github.com/MDietermann/ArduinoArchSetup/internal/module"
+	"github.com/MDietermann/ArduinoArchSetup/internal/platform"
+)
+
+type Module struct {
+	fonts []string
+	pm    platform.PackageManager
+	aur   platform.AURHelper
+}
+
+func New(fonts []string, pm platform.PackageManager, aur platform.AURHelper) Module {
+	return Module{fonts: fonts, pm: pm, aur: aur}
+}
+
+type state struct{ Missing []string }
+
+func (Module) Meta() module.Meta {
+	return module.Meta{ID: "fonts", Name: "Nerd fonts", Description: "Install AUR nerd fonts."}
+}
+
+func (m Module) Detect(ctx context.Context) (module.State, error) {
+	var missing []string
+	for _, f := range m.fonts {
+		ok, err := m.pm.IsInstalled(ctx, f)
+		if err != nil {
+			return nil, err
+		}
+		if !ok {
+			missing = append(missing, f)
+		}
+	}
+	return state{Missing: missing}, nil
+}
+
+func (m Module) Plan(ctx context.Context, cur module.State) (module.Plan, error) {
+	s, _ := cur.(state)
+	if len(s.Missing) == 0 {
+		return module.Plan{}, nil
+	}
+	missing := append([]string{}, s.Missing...)
+	return module.Plan{Actions: []module.Action{
+		{
+			Description: "ensure yay installed",
+			Kind:        module.ActionPackageInstall,
+			Exec:        func(ctx context.Context) error { return m.aur.EnsureInstalled(ctx) },
+		},
+		{
+			Description: "yay install " + strings.Join(missing, ", "),
+			Kind:        module.ActionPackageInstall,
+			Exec:        func(ctx context.Context) error { return m.aur.Install(ctx, missing) },
+		},
+	}}, nil
+}
+
+func (m Module) Apply(ctx context.Context, p module.Plan, r module.Reporter) error {
+	for i, a := range p.Actions {
+		r.Progress(m.Meta().ID, i+1, len(p.Actions), a.Description)
+		if err := a.Exec(ctx); err != nil {
+			return err
+		}
+	}
+	return nil
+}
+
+func (m Module) Verify(ctx context.Context) error {
+	st, err := m.Detect(ctx)
+	if err != nil {
+		return err
+	}
+	if miss := st.(state).Missing; len(miss) > 0 {
+		return fmt.Errorf("fonts still missing: %v", miss)
+	}
+	return nil
+}
diff --git a/internal/modules/fonts/fonts_test.go b/internal/modules/fonts/fonts_test.go
new file mode 100644
index 0000000..52c5150
--- /dev/null
+++ b/internal/modules/fonts/fonts_test.go
@@ -0,0 +1,72 @@
+package fonts
+
+import (
+	"context"
+	"testing"
+
+	"github.com/MDietermann/ArduinoArchSetup/internal/module"
+	"github.com/MDietermann/ArduinoArchSetup/internal/platform"
+)
+
+type fakeRunner struct {
+	runCalls  [][]string
+	outCalls  [][]string
+	installed map[string]bool
+}
+
+func (f *fakeRunner) Run(_ context.Context, name string, args ...string) error {
+	f.runCalls = append(f.runCalls, append([]string{name}, args...))
+	return nil
+}
+func (f *fakeRunner) Output(_ context.Context, name string, args ...string) ([]byte, error) {
+	f.outCalls = append(f.outCalls, append([]string{name}, args...))
+	if name == "pacman" && len(args) == 2 && args[0] == "-Q" {
+		if f.installed[args[1]] {
+			return []byte("ok"), nil
+		}
+		return nil, errOne
+	}
+	return nil, nil
+}
+
+type eo struct{}
+
+func (eo) Error() string { return "exit 1" }
+
+var errOne = eo{}
+
+type nop struct{}
+
+func (nop) Progress(string, int, int, string) {}
+func (nop) Log(string, string)                 {}
+
+func TestFontsPlanApplyUsesYay(t *testing.T) {
+	r := &fakeRunner{installed: map[string]bool{"yay": true}}
+	m := New([]string{"ttf-jetbrains-mono-nerd"}, platform.NewPacman(r), platform.NewYay(r))
+	st, _ := m.Detect(context.Background())
+	p, _ := m.Plan(context.Background(), st)
+	if err := m.Apply(context.Background(), p, nop{}); err != nil {
+		t.Fatal(err)
+	}
+	sawYay := false
+	for _, c := range r.runCalls {
+		if len(c) >= 2 && c[0] == "yay" && c[1] == "-S" {
+			sawYay = true
+		}
+	}
+	if !sawYay {
+		t.Fatalf("no yay install; calls=%v", r.runCalls)
+	}
+}
+
+func TestFontsDetectPresentNoActions(t *testing.T) {
+	r := &fakeRunner{installed: map[string]bool{"yay": true, "ttf-jetbrains-mono-nerd": true}}
+	m := New([]string{"ttf-jetbrains-mono-nerd"}, platform.NewPacman(r), platform.NewYay(r))
+	st, _ := m.Detect(context.Background())
+	p, _ := m.Plan(context.Background(), st)
+	if !p.IsEmpty() {
+		t.Fatal("want empty plan when already installed")
+	}
+}
+
+var _ module.Module = Module{}