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diff --git a/Cargo.toml b/Cargo.toml
index b8e5732..99982a7 100644
--- a/Cargo.toml
+++ b/Cargo.toml
@@ -4,7 +4,7 @@ version = "0.1.0"
 edition = "2021"
 
 [dependencies]
-gtk = { package = "gtk4", version = "0.11" }
+gtk = { package = "gtk4", version = "0.11", features = ["v4_12"] }
 anyhow = "1"
 regex = "1"
 serde = { version = "1", features = ["derive"] }
diff --git a/__pycache__/config.cpython-314.pyc b/__pycache__/config.cpython-314.pyc
deleted file mode 100644
index 0df73e5..0000000
Binary files a/__pycache__/config.cpython-314.pyc and /dev/null differ
diff --git a/__pycache__/gui.cpython-314.pyc b/__pycache__/gui.cpython-314.pyc
deleted file mode 100644
index dca7e7f..0000000
Binary files a/__pycache__/gui.cpython-314.pyc and /dev/null differ
diff --git a/__pycache__/svg_parser.cpython-314.pyc b/__pycache__/svg_parser.cpython-314.pyc
deleted file mode 100644
index 0b8ed1a..0000000
Binary files a/__pycache__/svg_parser.cpython-314.pyc and /dev/null differ
diff --git a/src/ui/editor.rs b/src/ui/editor.rs
new file mode 100644
index 0000000..45f2430
--- /dev/null
+++ b/src/ui/editor.rs
@@ -0,0 +1,153 @@
+use crate::color_scheme::ColorScheme;
+use anyhow::Result;
+use gtk::glib;
+use gtk::prelude::*;
+use gtk::{
+    Box as GtkBox, ColorDialog, ColorDialogButton, InfoBar, Label, MessageType, Orientation,
+    Picture, ScrolledWindow,
+};
+use std::cell::RefCell;
+use std::path::Path;
+use std::rc::Rc;
+
+pub fn build_editor_page(icon_path: &Path, on_back: impl Fn() + 'static) -> Result<gtk::Widget> {
+    let scheme = ColorScheme::load(icon_path)?;
+    let scheme = Rc::new(RefCell::new(scheme));
+
+    let root = GtkBox::new(Orientation::Vertical, 8);
+    root.set_margin_top(8);
+    root.set_margin_bottom(8);
+    root.set_margin_start(8);
+    root.set_margin_end(8);
+
+    let toolbar = GtkBox::new(Orientation::Horizontal, 8);
+    let back_button = gtk::Button::with_label("← Choose another icon");
+    back_button.connect_clicked(move |_| on_back());
+    toolbar.append(&back_button);
+
+    let undo_button = gtk::Button::with_label("Undo");
+    let redo_button = gtk::Button::with_label("Redo");
+    toolbar.append(&undo_button);
+    toolbar.append(&redo_button);
+    root.append(&toolbar);
+
+    if scheme.borrow().colors.is_empty() {
+        let info = InfoBar::new();
+        info.set_message_type(MessageType::Warning);
+        info.add_child(&Label::new(Some(
+            "No ColorScheme tags were found in this SVG.",
+        )));
+        root.append(&info);
+    }
+
+    let content = GtkBox::new(Orientation::Horizontal, 8);
+    content.set_vexpand(true);
+
+    let swatches_scroller = ScrolledWindow::new();
+    swatches_scroller.set_min_content_width(300);
+    let swatches_box = GtkBox::new(Orientation::Vertical, 4);
+    swatches_scroller.set_child(Some(&swatches_box));
+    content.append(&swatches_scroller);
+
+    let preview = Picture::new();
+    preview.set_hexpand(true);
+    content.append(&preview);
+
+    root.append(&content);
+
+    let refresh_preview = {
+        let scheme = Rc::clone(&scheme);
+        let preview = preview.clone();
+        move || {
+            let bytes = glib::Bytes::from_owned(scheme.borrow().content.clone().into_bytes());
+            match gtk::gdk::Texture::from_bytes(&bytes) {
+                Ok(texture) => preview.set_paintable(Some(&texture)),
+                Err(_) => preview.set_paintable(gtk::gdk::Paintable::NONE),
+            }
+        }
+    };
+    refresh_preview();
+
+    let rebuild_swatches: Rc<RefCell<Box<dyn Fn()>>> = Rc::new(RefCell::new(Box::new(|| {})));
+    {
+        let scheme = Rc::clone(&scheme);
+        let swatches_box = swatches_box.clone();
+        let refresh_preview = refresh_preview.clone();
+        let rebuild_swatches_for_closure = Rc::clone(&rebuild_swatches);
+
+        let build_fn = move || {
+            while let Some(child) = swatches_box.first_child() {
+                swatches_box.remove(&child);
+            }
+
+            let tags: Vec<(String, String)> = scheme.borrow().colors.clone();
+            for (tag, hex) in tags {
+                let row = GtkBox::new(Orientation::Horizontal, 8);
+                let label = Label::new(Some(&tag));
+                label.set_hexpand(true);
+                label.set_xalign(0.0);
+
+                let rgba = gtk::gdk::RGBA::parse(&hex).unwrap_or(gtk::gdk::RGBA::BLACK);
+                let dialog = ColorDialog::builder().with_alpha(false).build();
+                let button = ColorDialogButton::new(Some(dialog));
+                button.set_rgba(&rgba);
+
+                {
+                    let scheme = Rc::clone(&scheme);
+                    let tag = tag.clone();
+                    let refresh_preview = refresh_preview.clone();
+                    let rebuild_swatches_for_closure = Rc::clone(&rebuild_swatches_for_closure);
+                    button.connect_rgba_notify(move |btn| {
+                        let new_rgba = btn.rgba();
+                        let new_hex = format!(
+                            "#{:02x}{:02x}{:02x}",
+                            (new_rgba.red() * 255.0).round() as u8,
+                            (new_rgba.green() * 255.0).round() as u8,
+                            (new_rgba.blue() * 255.0).round() as u8,
+                        );
+                        let changed = scheme
+                            .borrow_mut()
+                            .update_color(&tag, &new_hex)
+                            .unwrap_or(false);
+                        if changed {
+                            refresh_preview();
+                            (rebuild_swatches_for_closure.borrow())();
+                        }
+                    });
+                }
+
+                row.append(&label);
+                row.append(&button);
+                swatches_box.append(&row);
+            }
+        };
+
+        *rebuild_swatches.borrow_mut() = Box::new(build_fn);
+    }
+    (rebuild_swatches.borrow())();
+
+    {
+        let scheme = Rc::clone(&scheme);
+        let refresh_preview = refresh_preview.clone();
+        let rebuild_swatches = Rc::clone(&rebuild_swatches);
+        undo_button.connect_clicked(move |_| {
+            if scheme.borrow_mut().undo().unwrap_or(false) {
+                refresh_preview();
+                (rebuild_swatches.borrow())();
+            }
+        });
+    }
+    {
+        let scheme = Rc::clone(&scheme);
+        let refresh_preview = refresh_preview.clone();
+        let rebuild_swatches = Rc::clone(&rebuild_swatches);
+        redo_button.connect_clicked(move |_| {
+            if scheme.borrow_mut().redo().unwrap_or(false) {
+                refresh_preview();
+                (rebuild_swatches.borrow())();
+            }
+        });
+    }
+
+    Ok(root.upcast())
+}