diff --git a/.gitignore b/.gitignore
new file mode 100644
index 0000000..c18dd8d
--- /dev/null
+++ b/.gitignore
@@ -0,0 +1 @@
+__pycache__/
diff --git a/iridium_installer/__init__.py b/iridium_installer/__init__.py
new file mode 100644
index 0000000..e69de29
diff --git a/iridium_installer/main.py b/iridium_installer/main.py
new file mode 100644
index 0000000..f31826b
--- /dev/null
+++ b/iridium_installer/main.py
@@ -0,0 +1,33 @@
+import sys
+
+import gi
+
+gi.require_version("Gtk", "4.0")
+gi.require_version("Adw", "1")
+
+from gi.repository import Adw, Gio, Gtk
+
+from .ui.window import InstallerWindow
+
+
+class IridiumInstallerApp(Adw.Application):
+    def __init__(self):
+        super().__init__(
+            application_id="org.iridium.Installer",
+            flags=Gio.ApplicationFlags.FLAGS_NONE,
+        )
+
+    def do_activate(self):
+        win = self.props.active_window
+        if not win:
+            win = InstallerWindow(application=self)
+        win.present()
+
+
+def main():
+    app = IridiumInstallerApp()
+    return app.run(sys.argv)
+
+
+if __name__ == "__main__":
+    sys.exit(main())
diff --git a/iridium_installer/ui/__init__.py b/iridium_installer/ui/__init__.py
new file mode 100644
index 0000000..e69de29
diff --git a/iridium_installer/ui/pages/__init__.py b/iridium_installer/ui/pages/__init__.py
new file mode 100644
index 0000000..e69de29
diff --git a/iridium_installer/ui/pages/storage.py b/iridium_installer/ui/pages/storage.py
new file mode 100644
index 0000000..88fd6c6
--- /dev/null
+++ b/iridium_installer/ui/pages/storage.py
@@ -0,0 +1,83 @@
+import gi
+
+gi.require_version("Gtk", "4.0")
+gi.require_version("Adw", "1")
+from gi.repository import Adw, Gtk
+
+
+class StoragePage(Adw.Bin):
+    def __init__(self, *args, **kwargs):
+        super().__init__(*args, **kwargs)
+
+        # Main Layout
+        clamp = Adw.Clamp()
+        clamp.set_maximum_size(600)
+        self.set_child(clamp)
+
+        box = Gtk.Box(orientation=Gtk.Orientation.VERTICAL)
+        box.set_spacing(24)
+        box.set_margin_top(24)
+        box.set_margin_bottom(24)
+        clamp.set_child(box)
+
+        # Title
+        title = Gtk.Label(label="Installation Destination")
+        title.add_css_class("title-1")
+        box.append(title)
+
+        descr = Gtk.Label(
+            label="Select the storage device where you want to install Iridium OS."
+        )
+        descr.set_wrap(True)
+        box.append(descr)
+
+        # Disk List
+        group = Adw.PreferencesGroup()
+        group.set_title("Available Disks")
+        box.append(group)
+
+        # Mock Disks
+        disks = [
+            (
+                "NVMe Samsung 970 EVO (500GB)",
+                "nvme0n1",
+                "icon-drive-harddisk-solidstate-symbolic",
+            ),
+            ("SATA Seagate Barracuda (1TB)", "sda", "icon-drive-harddisk-symbolic"),
+        ]
+
+        self.disk_rows = []
+        for name, dev, icon in disks:
+            row = Adw.ActionRow()
+            row.set_title(name)
+            row.set_subtitle(f"/dev/{dev}")
+            row.set_icon_name(icon)
+
+            # Radio button for selection
+            if not self.disk_rows:
+                radio = Gtk.CheckButton()
+                self.first_radio = radio
+            else:
+                radio = Gtk.CheckButton()
+                radio.set_group(self.first_radio)
+
+            radio.set_valign(Gtk.Align.CENTER)
+            row.add_suffix(radio)
+            row.set_activatable_widget(radio)
+
+            group.add(row)
+            self.disk_rows.append(row)
+
+        # Partitioning Options
+        part_group = Adw.PreferencesGroup()
+        part_group.set_title("Configuration")
+        box.append(part_group)
+
+        auto_row = Adw.ActionRow()
+        auto_row.set_title("Automatic Partitioning")
+        auto_row.set_subtitle("Erase disk and install Iridium")
+        part_switch = Gtk.Switch()
+        part_switch.set_active(True)
+        part_switch.set_valign(Gtk.Align.CENTER)
+        auto_row.add_suffix(part_switch)
+        part_group.add(auto_row)
diff --git a/iridium_installer/ui/pages/user.py b/iridium_installer/ui/pages/user.py
new file mode 100644
index 0000000..3eec538
--- /dev/null
+++ b/iridium_installer/ui/pages/user.py
@@ -0,0 +1,65 @@
+import gi
+
+gi.require_version("Gtk", "4.0")
+gi.require_version("Adw", "1")
+from gi.repository import Adw, Gtk
+
+
+class UserPage(Adw.Bin):
+    def __init__(self, *args, **kwargs):
+        super().__init__(*args, **kwargs)
+
+        clamp = Adw.Clamp()
+        clamp.set_maximum_size(500)
+        self.set_child(clamp)
+
+        box = Gtk.Box(orientation=Gtk.Orientation.VERTICAL)
+        box.set_spacing(24)
+        box.set_margin_top(24)
+        box.set_margin_bottom(24)
+        clamp.set_child(box)
+
+        title = Gtk.Label(label="Create User Account")
+        title.add_css_class("title-1")
+        box.append(title)
+
+        # Form Group
+        group = Adw.PreferencesGroup()
+        box.append(group)
+
+        self.fullname_row = Adw.EntryRow()
+        self.fullname_row.set_title("Full Name")
+        group.add(self.fullname_row)
+
+        self.username_row = Adw.EntryRow()
+        self.username_row.set_title("Username")
+        group.add(self.username_row)
+
+        self.password_row = Adw.PasswordEntryRow()
+        self.password_row.set_title("Password")
+        group.add(self.password_row)
+
+        self.confirm_row = Adw.PasswordEntryRow()
+        self.confirm_row.set_title("Confirm Password")
+        group.add(self.confirm_row)
+
+        # Hostname
+        host_group = Adw.PreferencesGroup()
+        host_group.set_margin_top(12)
+        box.append(host_group)
+
+        self.hostname_row = Adw.EntryRow()
+        self.hostname_row.set_title("Hostname")
+        self.hostname_row.set_text("iridium-pc")
+        host_group.add(self.hostname_row)
+
+        # Administrator
+        admin_group = Adw.PreferencesGroup()
+        admin_group.set_margin_top(12)
+        box.append(admin_group)
+
+        admin_row = Adw.SwitchRow()
+        admin_row.set_title("Make this user administrator")
+        admin_row.set_subtitle("Add to sudoers group")
+        admin_row.set_active(True)
+        admin_group.add(admin_row)
diff --git a/iridium_installer/ui/pages/welcome.py b/iridium_installer/ui/pages/welcome.py
new file mode 100644
index 0000000..2b61955
--- /dev/null
+++ b/iridium_installer/ui/pages/welcome.py
@@ -0,0 +1,41 @@
+import gi
+
+gi.require_version("Gtk", "4.0")
+gi.require_version("Adw", "1")
+from gi.repository import Adw, Gtk
+
+
+class WelcomePage(Adw.Bin):
+    def __init__(self, *args, **kwargs):
+        super().__init__(*args, **kwargs)
+
+        page = Adw.StatusPage()
+        page.set_title("Welcome to Iridium OS")
+        page.set_description("The future of computing is here. Let's get you set up.")
+        page.set_icon_name("system-software-install-symbolic")
+
+        # Content Box
+        box = Gtk.Box(orientation=Gtk.Orientation.VERTICAL)
+        box.set_spacing(12)
+        box.set_halign(Gtk.Align.CENTER)
+
+        lbl = Gtk.Label(label="Select your language:")
+        lbl.add_css_class("heading")
+        box.append(lbl)
+
+        # Language Dropdown
+        languages = [
+            "English (US)",
+            "Spanish",
+            "French",
+            "German",
+            "Japanese",
+            "Chinese (Simplified)",
+        ]
+        dropdown = Gtk.DropDown.new_from_strings(languages)
+        dropdown.set_margin_bottom(20)
+        box.append(dropdown)
+
+        page.set_child(box)
+
+        self.set_child(page)
diff --git a/iridium_installer/ui/window.py b/iridium_installer/ui/window.py
new file mode 100644
index 0000000..5c613a8
--- /dev/null
+++ b/iridium_installer/ui/window.py
@@ -0,0 +1,102 @@
+import gi
+
+gi.require_version("Gtk", "4.0")
+gi.require_version("Adw", "1")
+from gi.repository import Adw, Gtk
+
+from .pages.storage import StoragePage
+from .pages.user import UserPage
+from .pages.welcome import WelcomePage
+
+
+class InstallerWindow(Adw.ApplicationWindow):
+    def __init__(self, *args, **kwargs):
+        super().__init__(*args, **kwargs)
+
+        self.set_default_size(900, 650)
+        self.set_title("Iridium Installer")
+
+        # Main Layout
+        main_box = Gtk.Box(orientation=Gtk.Orientation.VERTICAL)
+        self.set_content(main_box)
+
+        # Header Bar
+        header = Adw.HeaderBar()
+        main_box.append(header)
+
+        # Content Stack
+        self.stack = Adw.ViewStack()
+        self.stack.set_vexpand(True)
+        main_box.append(self.stack)
+
+        # Navigation Bar (Bottom)
+        nav_box = Gtk.Box(orientation=Gtk.Orientation.HORIZONTAL)
+        nav_box.add_css_class("toolbar")
+        nav_box.set_margin_top(12)
+        nav_box.set_margin_bottom(12)
+        nav_box.set_margin_start(12)
+        nav_box.set_margin_end(12)
+        nav_box.set_spacing(12)
+        main_box.append(nav_box)
+
+        # Back Button
+        self.back_button = Gtk.Button(label="Back")
+        self.back_button.connect("clicked", self.on_back_clicked)
+        self.back_button.set_sensitive(False)
+        nav_box.append(self.back_button)
+
+        # Spacer to push Next button to the right
+        spacer = Gtk.Label()
+        spacer.set_hexpand(True)
+        nav_box.append(spacer)
+
+        # Next Button
+        self.next_button = Gtk.Button(label="Next")
+        self.next_button.add_css_class("suggested-action")
+        self.next_button.connect("clicked", self.on_next_clicked)
+        nav_box.append(self.next_button)
+
+        # Page Management
+        self.page_ids = []
+        self.current_page_index = 0
+
+        # Add Pages
+        self.add_page(WelcomePage(), "welcome")
+        self.add_page(StoragePage(), "storage")
+        self.add_page(UserPage(), "user")
+
+        # Initialize view
+        if self.page_ids:
+            self.stack.set_visible_child_name(self.page_ids[0])
+
+    def add_page(self, widget, name):
+        self.stack.add_named(widget, name)
+        self.page_ids.append(name)
+
+    def update_buttons(self):
+        # Back button state
+        self.back_button.set_sensitive(self.current_page_index > 0)
+
+        # Next button label/state
+        if self.current_page_index == len(self.page_ids) - 1:
+            self.next_button.set_label("Install")
+            self.next_button.add_css_class("destructive-action")
+            self.next_button.remove_css_class("suggested-action")
+        else:
+            self.next_button.set_label("Next")
+            self.next_button.remove_css_class("destructive-action")
+            self.next_button.add_css_class("suggested-action")
+
+    def on_back_clicked(self, button):
+        if self.current_page_index > 0:
+            self.current_page_index -= 1
+            self.stack.set_visible_child_name(self.page_ids[self.current_page_index])
+            self.update_buttons()
+
+    def on_next_clicked(self, button):
+        if self.current_page_index < len(self.page_ids) - 1:
+            self.current_page_index += 1
+            self.stack.set_visible_child_name(self.page_ids[self.current_page_index])
+            self.update_buttons()
+        else:
+            print("Install process triggered!")
diff --git a/run.sh b/run.sh
new file mode 100755
index 0000000..5c451d6
--- /dev/null
+++ b/run.sh
@@ -0,0 +1,5 @@
+#!/bin/bash
+export GSETTINGS_SCHEMA_DIR=.
+
+echo "Starting Iridium Installer..."
+python3 -m iridium_installer.main