commit 902a2e4c413cfbc1503554c570c80ca00c235a5e
Author: Gregor Lohaus <lohausgregor@gmail.com>
Date:   Mon Sep 7 21:45:50 2026 +0200

    init

diff --git a/.github/workflows/ci.yml b/.github/workflows/ci.yml
new file mode 100644
index 0000000..8d5d619
--- /dev/null
+++ b/.github/workflows/ci.yml
@@ -0,0 +1,26 @@
+name: Rust
+on: [push, pull_request]
+
+jobs:
+  test:
+    strategy:
+      fail-fast: false
+      matrix:
+        os: [ubuntu-latest, macos-14]
+    runs-on: ${{ matrix.os }}
+    steps:
+      - uses: actions/checkout@v4
+      - uses: dtolnay/rust-toolchain@stable
+        with:
+          components: rustfmt, clippy
+      - uses: mlugg/setup-zig@v2
+        with:
+          version: 0.15.2
+      - uses: Swatinem/rust-cache@v2
+      - name: Linux development libraries
+        if: runner.os == 'Linux'
+        run: sudo apt-get update && sudo apt-get install -y pkg-config libx11-dev libxkbcommon-dev libwayland-dev libegl1-mesa-dev
+      - run: cargo fmt --check
+      - run: cargo clippy --locked --all-targets -- -D warnings
+      - run: cargo test --locked -- --test-threads=1
+      - run: cargo build --locked
diff --git a/.gitignore b/.gitignore
new file mode 100644
index 0000000..42181f9
--- /dev/null
+++ b/.gitignore
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+/.tools/
diff --git a/Cargo.lock b/Cargo.lock
new file mode 100644
index 0000000..c931818
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+version = "0.5.15"
+source = "registry+https://github.com/rust-lang/crates.io-index"
+checksum = "27bc9d5b815bc103f142aa054f561d9187d191692ec7c2d1e2b4737f8dbd7296"
+dependencies = [
+ "zune-core",
+]
diff --git a/Cargo.toml b/Cargo.toml
new file mode 100644
index 0000000..adfd192
--- /dev/null
+++ b/Cargo.toml
@@ -0,0 +1,24 @@
+[package]
+name = "rust-term"
+version = "0.1.0"
+edition = "2024"
+rust-version = "1.92"
+description = "A Ghostty-powered terminal with tiled and floating panes"
+license = "MIT"
+
+[dependencies]
+anyhow = "1"
+eframe = { version = "0.33", default-features = false, features = ["default_fonts", "wgpu", "wayland", "x11"] }
+egui = "0.33"
+libghostty-vt = { version = "=0.2.1", features = ["png"] }
+png = "0.18"
+portable-pty = "0.9"
+serde = { version = "1", features = ["derive"] }
+toml = "0.9"
+wgpu = { version = "27", default-features = false, features = ["std", "vulkan", "gles", "metal", "wgsl"] }
+
+[dev-dependencies]
+base64 = "0.22"
+
+[profile.release]
+lto = "thin"
diff --git a/config.example.toml b/config.example.toml
new file mode 100644
index 0000000..03eb931
--- /dev/null
+++ b/config.example.toml
@@ -0,0 +1,40 @@
+# ~/.config/rust-term/config.toml
+# Omit shell to use $SHELL. Arguments are separate array entries.
+# shell = ["/bin/bash", "--login"]
+# working_directory = "/home/you"
+font_path = "/usr/local/share/fonts/MononokiNerdFont-Regular.ttf"
+font_size = 16
+scrollback = 10000
+window_width = 1100
+window_height = 720
+background = "#17191c"
+foreground = "#e2e4e8"
+accent = "#58c4ad"
+
+[kitty]
+image_storage_mb = 64
+allow_file = true
+allow_temp_file = true
+allow_shared_memory = true
+
+[multiplexer]
+max_panes = 32
+floating_width = 0.65
+floating_height = 0.65
+
+# Providing [keys] replaces the entire default map.
+[keys]
+"Alt+F" = "toggle_floats"
+"Alt+M" = "new_pane"
+"Alt+H" = "focus_left"
+"Alt+J" = "focus_down"
+"Alt+K" = "focus_up"
+"Alt+L" = "focus_right"
+"Alt+A" = "new_tab"
+"Alt+Shift+H" = "previous_tab"
+"Alt+Shift+L" = "next_tab"
+"Alt+X" = "close_pane"
+"Ctrl+Shift+Z" = "zoom_pane"
+"Ctrl+Shift+R" = "reload_config"
+"Ctrl+Shift+C" = "copy"
+"Ctrl+Shift+V" = "paste"
diff --git a/src/app.rs b/src/app.rs
new file mode 100644
index 0000000..7d24407
--- /dev/null
+++ b/src/app.rs
@@ -0,0 +1,606 @@
+use crate::{
+    config::{self, Action, Config},
+    input,
+    layout::{Axis, Direction, Layout, PaneId, Tab},
+    pane::{self, Pane},
+    render::color,
+};
+use anyhow::{Result, ensure};
+use egui::{Color32, Rect, Stroke, vec2};
+use std::{
+    collections::{BTreeMap, HashSet},
+    path::PathBuf,
+};
+
+pub struct App {
+    config: Config,
+    config_path: PathBuf,
+    panes: BTreeMap<PaneId, Pane>,
+    tabs: Vec<Tab>,
+    current: usize,
+    next_id: u64,
+    error: Option<String>,
+    suppressed: HashSet<egui::Key>,
+}
+
+pub fn fonts(config: &Config) -> Result<egui::FontDefinitions> {
+    let mut fonts = egui::FontDefinitions::default();
+    if let Some(path) = &config.font_path {
+        let data = std::fs::read(path)?;
+        fonts
+            .font_data
+            .insert("terminal".into(), egui::FontData::from_owned(data).into());
+        fonts
+            .families
+            .get_mut(&egui::FontFamily::Monospace)
+            .unwrap()
+            .insert(0, "terminal".into());
+    }
+    Ok(fonts)
+}
+
+impl App {
+    pub fn new(
+        cc: &eframe::CreationContext<'_>,
+        config: Config,
+        config_path: PathBuf,
+    ) -> Result<Self> {
+        cc.egui_ctx.set_visuals(egui::Visuals::dark());
+        cc.egui_ctx.set_fonts(fonts(&config)?);
+        let pane = Pane::new(&config, &cc.egui_ctx)?;
+        Ok(Self {
+            config,
+            config_path,
+            panes: BTreeMap::from([(1, pane)]),
+            tabs: vec![Tab::new(1, 1)],
+            current: 0,
+            next_id: 2,
+            error: None,
+            suppressed: HashSet::new(),
+        })
+    }
+
+    fn spawn(&mut self, ctx: &egui::Context) -> Result<PaneId> {
+        ensure!(
+            self.panes.len() < self.config.multiplexer.max_panes,
+            "Pane limit reached"
+        );
+        let pane = Pane::new(&self.config, ctx)?;
+        let id = self.next_id;
+        self.next_id += 1;
+        self.panes.insert(id, pane);
+        Ok(id)
+    }
+
+    fn action(&mut self, action: Action, ctx: &egui::Context) -> Result<()> {
+        let active = self.tabs[self.current].active;
+        match action {
+            Action::NewPane => {
+                let action = if self.tabs[self.current].floats_visible {
+                    Action::NewFloating
+                } else {
+                    let rect = self.panes[&active].last_rect;
+                    if rect.is_positive() && rect.height() > rect.width() {
+                        Action::SplitDown
+                    } else {
+                        Action::SplitRight
+                    }
+                };
+                self.action(action, ctx)?;
+            }
+            Action::SplitRight | Action::SplitDown => {
+                let id = self.spawn(ctx)?;
+                let tab = &mut self.tabs[self.current];
+                let axis = if action == Action::SplitRight {
+                    Axis::Horizontal
+                } else {
+                    Axis::Vertical
+                };
+                if let Some(root) = &mut tab.root {
+                    root.split(
+                        if tab.floats.contains(&active) {
+                            root.first()
+                        } else {
+                            active
+                        },
+                        id,
+                        axis,
+                    );
+                } else {
+                    tab.root = Some(Layout::Pane(id));
+                }
+                tab.active = id;
+                tab.zoomed = false;
+            }
+            Action::NewFloating => {
+                let id = self.spawn(ctx)?;
+                let tab = &mut self.tabs[self.current];
+                tab.floats.push(id);
+                tab.active = id;
+                tab.floats_visible = true;
+                tab.zoomed = false;
+            }
+            Action::ToggleFloating => {
+                let tab = &mut self.tabs[self.current];
+                let was_floating = tab.floats.contains(&active);
+                tab.detach(active);
+                if was_floating {
+                    if let Some(root) = &mut tab.root {
+                        root.split(root.first(), active, Axis::Horizontal);
+                    } else {
+                        tab.root = Some(Layout::Pane(active));
+                    }
+                } else {
+                    tab.floats.push(active);
+                    tab.floats_visible = true;
+                }
+            }
+            Action::ToggleFloats => {
+                if self.tabs[self.current].floats.is_empty() {
+                    self.action(Action::NewFloating, ctx)?;
+                } else {
+                    self.tabs[self.current].toggle_floats();
+                }
+            }
+            Action::FocusLeft | Action::FocusDown | Action::FocusUp | Action::FocusRight => {
+                let direction = match action {
+                    Action::FocusLeft => Direction::Left,
+                    Action::FocusDown => Direction::Down,
+                    Action::FocusUp => Direction::Up,
+                    _ => Direction::Right,
+                };
+                let rects = self
+                    .panes
+                    .iter()
+                    .map(|(id, pane)| (*id, pane.last_rect))
+                    .collect::<Vec<_>>();
+                self.tabs[self.current].focus_direction(direction, &rects);
+            }
+            Action::NextPane | Action::PreviousPane => {
+                self.tabs[self.current].cycle(action == Action::PreviousPane)
+            }
+            Action::ClosePane => self.close(active, ctx),
+            Action::ZoomPane => {
+                let tab = &mut self.tabs[self.current];
+                if tab.is_visible(tab.active) {
+                    tab.zoomed = !tab.zoomed;
+                }
+            }
+            Action::NewTab => {
+                let id = self.spawn(ctx)?;
+                self.tabs.push(Tab::new(id, id));
+                self.current = self.tabs.len() - 1;
+            }
+            Action::NextTab => self.current = (self.current + 1) % self.tabs.len(),
+            Action::PreviousTab => {
+                self.current = (self.current + self.tabs.len() - 1) % self.tabs.len()
+            }
+            Action::ReloadConfig => {
+                let config = Config::load(&self.config_path)?;
+                let fonts = fonts(&config)?;
+                for pane in self.panes.values_mut() {
+                    pane::apply_config(&mut pane.terminal, &config)?;
+                }
+                ctx.set_fonts(fonts);
+                self.config = config;
+            }
+            Action::Copy => {
+                if let Some(text) = self.panes[&active].copy()? {
+                    ctx.copy_text(text);
+                }
+            }
+            Action::Paste => ctx.send_viewport_cmd(egui::ViewportCommand::RequestPaste),
+        }
+        Ok(())
+    }
+
+    fn close(&mut self, id: PaneId, ctx: &egui::Context) {
+        self.panes.remove(&id);
+        for tab in &mut self.tabs {
+            if !tab.ids().contains(&id) {
+                continue;
+            }
+            tab.detach(id);
+            if tab.active == id
+                && let Some(next) = tab.ids().first()
+            {
+                tab.active = *next;
+            }
+            if tab.root.is_none() {
+                tab.floats_visible = true;
+            }
+        }
+        self.tabs.retain(|t| !t.ids().is_empty());
+        self.current = self.current.min(self.tabs.len().saturating_sub(1));
+        if self.tabs.is_empty() {
+            ctx.send_viewport_cmd(egui::ViewportCommand::Close);
+        }
+    }
+
+    fn keyboard(&mut self, ctx: &egui::Context) -> Result<()> {
+        let events = ctx.input(|i| i.events.clone());
+        let modifiers = ctx.input(|i| i.modifiers);
+        let mut terminal_events = vec![];
+        let mut suppress_text = false;
+        for event in events {
+            if let egui::Event::Key {
+                key,
+                pressed,
+                repeat,
+                modifiers,
+                ..
+            } = &event
+            {
+                suppress_text = false;
+                if !pressed && self.suppressed.remove(key) {
+                    continue;
+                }
+                let action = self.config.keys.iter().find_map(|(s, a)| {
+                    let shortcut = config::shortcut(s).ok()?;
+                    let m = shortcut.modifiers;
+                    (shortcut.logical_key == *key
+                        && m.ctrl == modifiers.ctrl
+                        && m.shift == modifiers.shift
+                        && m.alt == modifiers.alt
+                        && m.mac_cmd == modifiers.mac_cmd)
+                        .then_some(*a)
+                });
+                if *pressed && let Some(action) = action {
+                    self.flush_keys(&mut terminal_events)?;
+                    self.suppressed.insert(*key);
+                    suppress_text = true;
+                    if !repeat {
+                        self.action(action, ctx)?;
+                    }
+                    if self.tabs.is_empty() {
+                        return Ok(());
+                    }
+                    continue;
+                }
+            }
+            if suppress_text && matches!(event, egui::Event::Text(_)) {
+                continue;
+            }
+            let active = self.tabs[self.current].active;
+            if !self.tabs[self.current].is_visible(active) {
+                continue;
+            }
+            match event {
+                egui::Event::Paste(text) => {
+                    self.flush_keys(&mut terminal_events)?;
+                    self.panes.get_mut(&active).unwrap().paste(&text)?;
+                }
+                egui::Event::Copy => {
+                    self.flush_keys(&mut terminal_events)?;
+                    if modifiers.shift || modifiers.mac_cmd {
+                        self.action(Action::Copy, ctx)?;
+                    } else {
+                        self.panes.get_mut(&active).unwrap().send(vec![3])?;
+                    }
+                }
+                egui::Event::Cut => {
+                    self.flush_keys(&mut terminal_events)?;
+                    self.panes.get_mut(&active).unwrap().send(vec![24])?;
+                }
+                other => terminal_events.push(other),
+            }
+        }
+        self.flush_keys(&mut terminal_events)
+    }
+
+    fn flush_keys(&mut self, events: &mut Vec<egui::Event>) -> Result<()> {
+        let active = self.tabs[self.current].active;
+        if !self.tabs[self.current].is_visible(active) {
+            events.clear();
+            return Ok(());
+        }
+        let pane = self.panes.get_mut(&active).unwrap();
+        let encoded = input::encode(&pane.terminal, events)?;
+        pane.send(encoded)?;
+        events.clear();
+        Ok(())
+    }
+}
+
+impl eframe::App for App {
+    fn update(&mut self, ctx: &egui::Context, _frame: &mut eframe::Frame) {
+        if self.tabs.is_empty() {
+            return;
+        }
+        for pane in self.panes.values_mut() {
+            pane.drain(ctx);
+        }
+        if let Err(e) = self.keyboard(ctx) {
+            self.error = Some(e.to_string());
+        }
+        if self.tabs.is_empty() {
+            return;
+        }
+        let mut action = None;
+        egui::TopBottomPanel::top("tabs").show(ctx, |ui| {
+            ui.horizontal_wrapped(|ui| {
+                for (index, tab) in self.tabs.iter().enumerate() {
+                    let title = self.panes[&tab.active].terminal.title().unwrap_or("");
+                    let label = if title.is_empty() {
+                        format!("{}: shell", index + 1)
+                    } else {
+                        format!(
+                            "{}: {}",
+                            index + 1,
+                            title.chars().take(28).collect::<String>()
+                        )
+                    };
+                    if ui.selectable_label(self.current == index, label).clicked() {
+                        self.current = index;
+                    }
+                }
+                if ui.button("+").on_hover_text("New tab").clicked() {
+                    action = Some(Action::NewTab);
+                }
+                ui.menu_button("Pane", |ui| {
+                    for (label, a) in [
+                        ("New pane", Action::NewPane),
+                        ("Split right", Action::SplitRight),
+                        ("Split down", Action::SplitDown),
+                        ("New floating pane", Action::NewFloating),
+                        ("Float / dock", Action::ToggleFloating),
+                        ("Show / hide floating panes", Action::ToggleFloats),
+                        ("Zoom / restore", Action::ZoomPane),
+                        ("Next pane", Action::NextPane),
+                        ("Close pane", Action::ClosePane),
+                    ] {
+                        if ui.button(label).clicked() {
+                            action = Some(a);
+                            ui.close();
+                        }
+                    }
+                });
+                ui.menu_button("Settings", |ui| {
+                    if ui.button("Reload config").clicked() {
+                        action = Some(Action::ReloadConfig);
+                        ui.close();
+                    }
+                });
+            });
+        });
+        if let Some(error) = self.error.clone() {
+            egui::TopBottomPanel::bottom("error").show(ctx, |ui| {
+                ui.horizontal_wrapped(|ui| {
+                    ui.colored_label(Color32::LIGHT_RED, error);
+                    if ui.button("Dismiss").clicked() {
+                        self.error = None;
+                    }
+                });
+            });
+        }
+        let bg = color(config::rgb(&self.config.background).unwrap());
+        let tab = &mut self.tabs[self.current];
+        let mut tiled = vec![];
+        let mut workspace = Rect::NOTHING;
+        egui::CentralPanel::default()
+            .frame(egui::Frame::NONE.fill(bg))
+            .show(ctx, |ui| {
+                workspace = ui.max_rect();
+                if tab.zoomed {
+                    tiled.push((tab.active, workspace));
+                } else if let Some(root) = &mut tab.root {
+                    root.arrange(ui, workspace, &mut tiled, 1);
+                }
+                for (id, rect) in &tiled {
+                    let pane = self.panes.get_mut(id).unwrap();
+                    let active = tab.active == *id;
+                    if !tab.zoomed {
+                        pane.last_rect = *rect;
+                    }
+                    if show_pane(ui, *id, pane, *rect, &self.config, active) {
+                        tab.active = *id;
+                    }
+                }
+            });
+        if tab.floats_visible && !tab.zoomed {
+            for id in tab.floats.clone() {
+                let pane = self.panes.get_mut(&id).unwrap();
+                let window_id = egui::Id::new(("float", tab.id, id));
+                let active = tab.active == id;
+                let result = egui::Window::new(pane_title(id, pane))
+                    .id(window_id)
+                    .title_bar(false)
+                    .constrain_to(workspace)
+                    .default_pos(
+                        workspace.min
+                            + vec2(40.0 + (id % 5) as f32 * 22.0, 40.0 + (id % 5) as f32 * 22.0),
+                    )
+                    .default_size(
+                        workspace.size()
+                            * vec2(
+                                self.config.multiplexer.floating_width,
+                                self.config.multiplexer.floating_height,
+                            ),
+                    )
+                    .min_size(vec2(160.0, 100.0))
+                    .frame(egui::Frame::NONE.fill(bg))
+                    .show(ctx, |ui| {
+                        let rect = ui.available_rect_before_wrap();
+                        ui.allocate_rect(rect, egui::Sense::hover());
+                        pane.last_rect = rect;
+                        if show_pane(ui, id, pane, rect, &self.config, active) {
+                            tab.active = id;
+                        }
+                    });
+                if let Some(result) = result
+                    && result.response.contains_pointer()
+                    && ctx.input(|i| i.pointer.any_pressed())
+                {
+                    tab.active = id;
+                }
+                if active {
+                    ctx.move_to_top(egui::LayerId::new(egui::Order::Middle, window_id));
+                }
+            }
+        }
+        let active = tab.active;
+        for (id, pane) in &mut self.panes {
+            if let Err(e) =
+                pane.focus(*id == active && tab.is_visible(*id) && ctx.input(|i| i.focused))
+            {
+                pane.error = Some(e.to_string());
+            }
+        }
+        if !self.tabs.is_empty()
+            && let Some(action) = action
+            && let Err(e) = self.action(action, ctx)
+        {
+            self.error = Some(e.to_string());
+        }
+    }
+}
+
+fn show_pane(
+    ui: &mut egui::Ui,
+    id: PaneId,
+    pane: &mut Pane,
+    rect: Rect,
+    config: &Config,
+    active: bool,
+) -> bool {
+    let accent = color(config::rgb(&config.accent).unwrap());
+    let title_rect = Rect::from_min_size(rect.min, vec2(rect.width(), 25.0_f32.min(rect.height())));
+    ui.painter().rect_filled(
+        title_rect,
+        0,
+        Color32::from_gray(if active { 43 } else { 31 }),
+    );
+    ui.painter()
+        .with_clip_rect(title_rect.shrink(3.0).intersect(ui.clip_rect()))
+        .text(
+            title_rect.min + vec2(7.0, 4.0),
+            egui::Align2::LEFT_TOP,
+            pane_title(id, pane),
+            egui::FontId::proportional(13.0),
+            if active { accent } else { Color32::GRAY },
+        );
+    // Click-only leaves dragging to the floating window's existing move handler.
+    let header = ui.interact(
+        title_rect,
+        ui.id().with(("title", id)),
+        egui::Sense::click(),
+    );
+    let mut focused =
+        header.clicked() || (header.contains_pointer() && ui.input(|i| i.pointer.any_pressed()));
+    let content = Rect::from_min_max(egui::pos2(rect.left(), title_rect.bottom()), rect.max);
+    // The pane rectangle is already allocated; a layout scope would grow its parent.
+    let mut content_ui = ui.new_child(egui::UiBuilder::new().id_salt(id).max_rect(content));
+    content_ui.set_clip_rect(content.intersect(ui.clip_rect()));
+    match pane.show(&mut content_ui, content, config, active) {
+        Ok(clicked) => focused |= clicked,
+        Err(e) => pane.error = Some(e.to_string()),
+    }
+    ui.painter().rect_stroke(
+        rect,
+        0,
+        Stroke::new(
+            1.0,
+            if active {
+                accent
+            } else {
+                Color32::from_gray(54)
+            },
+        ),
+        egui::StrokeKind::Inside,
+    );
+    focused
+}
+
+fn pane_title(id: PaneId, pane: &Pane) -> String {
+    let title = pane.terminal.title().unwrap_or("");
+    format!(
+        "{id}  {}{}",
+        if title.is_empty() { "shell" } else { title },
+        if pane.dead { " [exited]" } else { "" }
+    )
+}
+
+#[cfg(test)]
+mod tests {
+    use super::*;
+
+    fn test_app(ctx: &egui::Context) -> App {
+        let config = Config {
+            shell: vec!["/bin/sh".into()],
+            ..Default::default()
+        };
+        let pane = Pane::new(&config, ctx).unwrap();
+        App {
+            config,
+            config_path: PathBuf::new(),
+            panes: BTreeMap::from([(1, pane)]),
+            tabs: vec![Tab::new(1, 1)],
+            current: 0,
+            next_id: 2,
+            error: None,
+            suppressed: HashSet::new(),
+        }
+    }
+
+    #[test]
+    fn floating_pane_size_stays_constant_across_frames() {
+        let ctx = egui::Context::default();
+        let mut app = test_app(&ctx);
+        let mut sizes = vec![];
+        for frame in 0..20 {
+            let input = egui::RawInput {
+                screen_rect: Some(Rect::from_min_size(egui::Pos2::ZERO, vec2(1000.0, 800.0))),
+                time: Some(frame as f64 / 60.0),
+                ..Default::default()
+            };
+            let _ = ctx.run(input, |ctx| {
+                let window = egui::Window::new("float")
+                    .title_bar(false)
+                    .default_size(vec2(400.0, 240.0))
+                    .frame(egui::Frame::NONE)
+                    .show(ctx, |ui| {
+                        let rect = ui.available_rect_before_wrap();
+                        ui.allocate_rect(rect, egui::Sense::hover());
+                        show_pane(
+                            ui,
+                            1,
+                            app.panes.get_mut(&1).unwrap(),
+                            rect,
+                            &app.config,
+                            true,
+                        );
+                    })
+                    .unwrap();
+                if frame >= 2 {
+                    sizes.push(window.response.rect.size());
+                }
+            });
+        }
+        assert!(
+            sizes.iter().all(|size| *size == sizes[0]),
+            "floating pane grew: {sizes:?}"
+        );
+    }
+
+    #[test]
+    fn toggle_creates_first_float_then_reuses_it_and_close_removes_focus() {
+        let ctx = egui::Context::default();
+        let mut app = test_app(&ctx);
+        app.action(Action::ToggleFloats, &ctx).unwrap();
+        assert_eq!(app.tabs[0].floats, vec![2]);
+        assert_eq!(app.tabs[0].active, 2);
+        assert!(app.tabs[0].floats_visible);
+        app.action(Action::ToggleFloats, &ctx).unwrap();
+        assert!(!app.tabs[0].floats_visible);
+        assert_eq!(app.tabs[0].active, 1);
+        app.action(Action::ToggleFloats, &ctx).unwrap();
+        assert_eq!(app.panes.len(), 2);
+        assert_eq!(app.tabs[0].active, 2);
+        app.action(Action::ClosePane, &ctx).unwrap();
+        assert_eq!(app.tabs[0].active, 1);
+        assert!(!app.panes.contains_key(&2));
+        app.action(Action::ToggleFloats, &ctx).unwrap();
+        assert_eq!(app.tabs[0].floats, vec![3]);
+        assert!(app.tabs[0].floats_visible);
+    }
+}
diff --git a/src/config.rs b/src/config.rs
new file mode 100644
index 0000000..ca1b61f
--- /dev/null
+++ b/src/config.rs
@@ -0,0 +1,267 @@
+use anyhow::{Context, Result, bail, ensure};
+use serde::Deserialize;
+use std::{
+    collections::BTreeMap,
+    path::{Path, PathBuf},
+};
+
+pub const EXAMPLE: &str = include_str!("../config.example.toml");
+
+#[derive(Clone, Debug, Deserialize)]
+#[serde(default, deny_unknown_fields)]
+pub struct Config {
+    pub shell: Vec<String>,
+    pub working_directory: Option<PathBuf>,
+    pub font_size: f32,
+    pub font_path: Option<PathBuf>,
+    pub scrollback: usize,
+    pub window_width: f32,
+    pub window_height: f32,
+    pub background: String,
+    pub foreground: String,
+    pub accent: String,
+    pub kitty: Kitty,
+    pub multiplexer: Multiplexer,
+    pub keys: BTreeMap<String, Action>,
+}
+
+#[derive(Clone, Debug, Deserialize)]
+#[serde(default, deny_unknown_fields)]
+pub struct Kitty {
+    pub image_storage_mb: u64,
+    pub allow_file: bool,
+    pub allow_temp_file: bool,
+    pub allow_shared_memory: bool,
+}
+
+#[derive(Clone, Debug, Deserialize)]
+#[serde(default, deny_unknown_fields)]
+pub struct Multiplexer {
+    pub max_panes: usize,
+    pub floating_width: f32,
+    pub floating_height: f32,
+}
+
+#[derive(Clone, Copy, Debug, Deserialize, PartialEq, Eq)]
+#[serde(rename_all = "snake_case")]
+pub enum Action {
+    SplitRight,
+    SplitDown,
+    NewFloating,
+    NewPane,
+    ToggleFloating,
+    ToggleFloats,
+    NextPane,
+    PreviousPane,
+    FocusLeft,
+    FocusDown,
+    FocusUp,
+    FocusRight,
+    ClosePane,
+    ZoomPane,
+    NewTab,
+    NextTab,
+    PreviousTab,
+    ReloadConfig,
+    Copy,
+    Paste,
+}
+
+impl Default for Kitty {
+    fn default() -> Self {
+        Self {
+            image_storage_mb: 64,
+            allow_file: true,
+            allow_temp_file: true,
+            allow_shared_memory: true,
+        }
+    }
+}
+impl Default for Multiplexer {
+    fn default() -> Self {
+        Self {
+            max_panes: 32,
+            floating_width: 0.65,
+            floating_height: 0.65,
+        }
+    }
+}
+impl Default for Config {
+    fn default() -> Self {
+        Self {
+            shell: vec![std::env::var("SHELL").unwrap_or_else(|_| "/bin/sh".into())],
+            working_directory: None,
+            font_size: 16.0,
+            font_path: None,
+            scrollback: 10000,
+            window_width: 1100.0,
+            window_height: 720.0,
+            background: "#17191c".into(),
+            foreground: "#e2e4e8".into(),
+            accent: "#58c4ad".into(),
+            kitty: Kitty::default(),
+            multiplexer: Multiplexer::default(),
+            keys: [
+                ("Alt+F", Action::ToggleFloats),
+                ("Alt+M", Action::NewPane),
+                ("Alt+H", Action::FocusLeft),
+                ("Alt+J", Action::FocusDown),
+                ("Alt+K", Action::FocusUp),
+                ("Alt+L", Action::FocusRight),
+                ("Alt+A", Action::NewTab),
+                ("Alt+Shift+H", Action::PreviousTab),
+                ("Alt+Shift+L", Action::NextTab),
+                ("Alt+X", Action::ClosePane),
+                ("Ctrl+Shift+Z", Action::ZoomPane),
+                ("Ctrl+Shift+R", Action::ReloadConfig),
+                ("Ctrl+Shift+C", Action::Copy),
+                ("Ctrl+Shift+V", Action::Paste),
+            ]
+            .into_iter()
+            .map(|(k, v)| (k.into(), v))
+            .collect(),
+        }
+    }
+}
+
+impl Config {
+    pub fn path() -> Result<PathBuf> {
+        if let Some(dir) = std::env::var_os("XDG_CONFIG_HOME").filter(|p| !p.is_empty()) {
+            return Ok(PathBuf::from(dir).join("rust-term/config.toml"));
+        }
+        Ok(
+            PathBuf::from(std::env::var_os("HOME").context("HOME is not set")?)
+                .join(".config/rust-term/config.toml"),
+        )
+    }
+
+    pub fn load(path: &Path) -> Result<Self> {
+        match std::fs::read_to_string(path) {
+            Ok(text) => {
+                Self::parse(&text).with_context(|| format!("Invalid config: {}", path.display()))
+            }
+            Err(e) if e.kind() == std::io::ErrorKind::NotFound => Ok(Self::default()),
+            Err(e) => Err(e).with_context(|| format!("Cannot read {}", path.display())),
+        }
+    }
+
+    pub fn parse(text: &str) -> Result<Self> {
+        let config: Self = toml::from_str(text)?;
+        ensure!(
+            !config.shell.is_empty() && !config.shell[0].is_empty(),
+            "shell must contain an executable"
+        );
+        ensure!(
+            (8.0..=48.0).contains(&config.font_size),
+            "font_size must be 8..48"
+        );
+        ensure!(
+            (320.0..=16384.0).contains(&config.window_width)
+                && (200.0..=16384.0).contains(&config.window_height),
+            "invalid window dimensions"
+        );
+        ensure!(
+            config.scrollback <= 1_000_000,
+            "scrollback must be <= 1000000"
+        );
+        ensure!(
+            (1..=1024).contains(&config.kitty.image_storage_mb),
+            "image_storage_mb must be 1..1024"
+        );
+        ensure!(
+            (1..=128).contains(&config.multiplexer.max_panes),
+            "max_panes must be 1..128"
+        );
+        for fraction in [
+            config.multiplexer.floating_width,
+            config.multiplexer.floating_height,
+        ] {
+            ensure!(
+                (0.2..=0.95).contains(&fraction),
+                "floating dimensions must be fractions in 0.2..0.95"
+            );
+        }
+        for color in [&config.background, &config.foreground, &config.accent] {
+            rgb(color)?;
+        }
+        for key in config.keys.keys() {
+            shortcut(key)?;
+        }
+        Ok(config)
+    }
+}
+
+pub fn rgb(text: &str) -> Result<libghostty_vt::style::RgbColor> {
+    ensure!(
+        text.len() == 7
+            && text.starts_with('#')
+            && text[1..].bytes().all(|c| c.is_ascii_hexdigit()),
+        "color must be #RRGGBB: {text}"
+    );
+    let value = u32::from_str_radix(&text[1..], 16)?;
+    Ok(libghostty_vt::style::RgbColor {
+        r: (value >> 16) as u8,
+        g: (value >> 8) as u8,
+        b: value as u8,
+    })
+}
+
+pub fn shortcut(text: &str) -> Result<egui::KeyboardShortcut> {
+    let mut mods = egui::Modifiers::NONE;
+    let parts: Vec<_> = text.split('+').collect();
+    for part in &parts[..parts.len() - 1] {
+        match *part {
+            "Ctrl" => mods.ctrl = true,
+            "Shift" => mods.shift = true,
+            "Alt" => mods.alt = true,
+            "Super" => {
+                mods.mac_cmd = true;
+                mods.command = true;
+            }
+            _ => bail!("unknown modifier in {text}"),
+        }
+    }
+    let key = egui::Key::from_name(parts[parts.len() - 1])
+        .with_context(|| format!("unknown key in {text}"))?;
+    Ok(egui::KeyboardShortcut::new(mods, key))
+}
+
+#[cfg(test)]
+mod tests {
+    use super::*;
+    #[test]
+    fn validates_example_and_rejects_bad_values() {
+        let example = Config::parse(EXAMPLE).unwrap();
+        assert_eq!(example.keys, Config::default().keys);
+        for text in [
+            "font_size = nan",
+            "shell = []",
+            "background = '#xx0000'",
+            "font_sze = 16",
+            "[keys]\n'Hyper+Q' = 'close_pane'",
+            "[multiplexer]\nfloating_width = 2",
+        ] {
+            assert!(Config::parse(text).is_err(), "accepted {text}");
+        }
+    }
+
+    #[test]
+    fn default_shortcuts_match_pane_and_tab_actions() {
+        let config = Config::default();
+        for (binding, action) in [
+            ("Alt+F", Action::ToggleFloats),
+            ("Alt+M", Action::NewPane),
+            ("Alt+H", Action::FocusLeft),
+            ("Alt+J", Action::FocusDown),
+            ("Alt+K", Action::FocusUp),
+            ("Alt+L", Action::FocusRight),
+            ("Alt+A", Action::NewTab),
+            ("Alt+Shift+H", Action::PreviousTab),
+            ("Alt+Shift+L", Action::NextTab),
+            ("Alt+X", Action::ClosePane),
+        ] {
+            assert_eq!(config.keys.get(binding), Some(&action));
+            assert!(shortcut(binding).unwrap().modifiers.alt);
+        }
+    }
+}
diff --git a/src/input.rs b/src/input.rs
new file mode 100644
index 0000000..5d8b53d
--- /dev/null
+++ b/src/input.rs
@@ -0,0 +1,180 @@
+use anyhow::Result;
+use libghostty_vt::{Terminal, key};
+
+pub fn mods(m: egui::Modifiers) -> key::Mods {
+    let mut out = key::Mods::empty();
+    if m.ctrl {
+        out |= key::Mods::CTRL;
+    }
+    if m.shift {
+        out |= key::Mods::SHIFT;
+    }
+    if m.alt {
+        out |= key::Mods::ALT;
+    }
+    if m.mac_cmd {
+        out |= key::Mods::SUPER;
+    }
+    out
+}
+
+pub fn encode(terminal: &Terminal<'_, '_>, events: &[egui::Event]) -> Result<Vec<u8>> {
+    let mut encoder = key::Encoder::new()?;
+    encoder.set_options_from_terminal(terminal);
+    let mut event = key::Event::new()?;
+    let mut out = vec![];
+    let mut used_text = std::collections::HashSet::new();
+    for (index, e) in events.iter().enumerate() {
+        match e {
+            egui::Event::Key {
+                key: k,
+                physical_key,
+                pressed,
+                repeat,
+                modifiers,
+            } => {
+                let (logical, ucp) = map(*k);
+                let (physical, _) = map(physical_key.unwrap_or(*k));
+                let mut text = None;
+                if *pressed && printable(*k) {
+                    // winit emits text immediately after its key event. Stop at the next key
+                    // so a burst of distinct keys cannot consume each other's text.
+                    for (i, next) in events.iter().enumerate().skip(index + 1) {
+                        if matches!(next, egui::Event::Key { .. }) {
+                            break;
+                        }
+                        if let egui::Event::Text(value) = next {
+                            text = Some(value.as_str());
+                            used_text.insert(i);
+                            break;
+                        }
+                    }
+                }
+                event
+                    .set_action(if !pressed {
+                        key::Action::Release
+                    } else if *repeat {
+                        key::Action::Repeat
+                    } else {
+                        key::Action::Press
+                    })
+                    .set_key(if physical == key::Key::Unidentified {
+                        logical
+                    } else {
+                        physical
+                    })
+                    .set_mods(mods(*modifiers))
+                    .set_consumed_mods(if text.is_some() {
+                        key::Mods::SHIFT
+                    } else {
+                        key::Mods::empty()
+                    })
+                    .set_unshifted_codepoint(ucp)
+                    .set_utf8(text);
+                encoder.encode_to_vec(&event, &mut out)?;
+            }
+            egui::Event::Text(text) if !used_text.contains(&index) => {
+                event
+                    .set_action(key::Action::Press)
+                    .set_key(key::Key::Unidentified)
+                    .set_mods(key::Mods::empty())
+                    .set_consumed_mods(key::Mods::empty())
+                    .set_unshifted_codepoint('\0')
+                    .set_utf8(Some(text.as_str()));
+                encoder.encode_to_vec(&event, &mut out)?;
+            }
+            egui::Event::Ime(egui::ImeEvent::Commit(text)) => {
+                out.extend_from_slice(text.as_bytes())
+            }
+            _ => {}
+        }
+    }
+    Ok(out)
+}
+
+fn printable(k: egui::Key) -> bool {
+    let (_, c) = map(k);
+    c != '\0'
+}
+
+fn map(k: egui::Key) -> (key::Key, char) {
+    use egui::Key as E;
+    use key::Key as G;
+    match k {
+        E::A => (G::A, 'a'),
+        E::B => (G::B, 'b'),
+        E::C => (G::C, 'c'),
+        E::D => (G::D, 'd'),
+        E::E => (G::E, 'e'),
+        E::F => (G::F, 'f'),
+        E::G => (G::G, 'g'),
+        E::H => (G::H, 'h'),
+        E::I => (G::I, 'i'),
+        E::J => (G::J, 'j'),
+        E::K => (G::K, 'k'),
+        E::L => (G::L, 'l'),
+        E::M => (G::M, 'm'),
+        E::N => (G::N, 'n'),
+        E::O => (G::O, 'o'),
+        E::P => (G::P, 'p'),
+        E::Q => (G::Q, 'q'),
+        E::R => (G::R, 'r'),
+        E::S => (G::S, 's'),
+        E::T => (G::T, 't'),
+        E::U => (G::U, 'u'),
+        E::V => (G::V, 'v'),
+        E::W => (G::W, 'w'),
+        E::X => (G::X, 'x'),
+        E::Y => (G::Y, 'y'),
+        E::Z => (G::Z, 'z'),
+        E::Num0 => (G::Digit0, '0'),
+        E::Num1 => (G::Digit1, '1'),
+        E::Num2 => (G::Digit2, '2'),
+        E::Num3 => (G::Digit3, '3'),
+        E::Num4 => (G::Digit4, '4'),
+        E::Num5 => (G::Digit5, '5'),
+        E::Num6 => (G::Digit6, '6'),
+        E::Num7 => (G::Digit7, '7'),
+        E::Num8 => (G::Digit8, '8'),
+        E::Num9 => (G::Digit9, '9'),
+        E::Space => (G::Space, ' '),
+        E::Minus => (G::Minus, '-'),
+        E::Equals => (G::Equal, '='),
+        E::Comma => (G::Comma, ','),
+        E::Period => (G::Period, '.'),
+        E::Slash => (G::Slash, '/'),
+        E::Backslash => (G::Backslash, '\\'),
+        E::OpenBracket => (G::BracketLeft, '['),
+        E::CloseBracket => (G::BracketRight, ']'),
+        E::Backtick => (G::Backquote, '`'),
+        E::Semicolon => (G::Semicolon, ';'),
+        E::Quote => (G::Quote, '\''),
+        E::ArrowDown => (G::ArrowDown, '\0'),
+        E::ArrowUp => (G::ArrowUp, '\0'),
+        E::ArrowLeft => (G::ArrowLeft, '\0'),
+        E::ArrowRight => (G::ArrowRight, '\0'),
+        E::Enter => (G::Enter, '\0'),
+        E::Escape => (G::Escape, '\0'),
+        E::Tab => (G::Tab, '\0'),
+        E::Backspace => (G::Backspace, '\0'),
+        E::Delete => (G::Delete, '\0'),
+        E::Insert => (G::Insert, '\0'),
+        E::Home => (G::Home, '\0'),
+        E::End => (G::End, '\0'),
+        E::PageUp => (G::PageUp, '\0'),
+        E::PageDown => (G::PageDown, '\0'),
+        E::F1 => (G::F1, '\0'),
+        E::F2 => (G::F2, '\0'),
+        E::F3 => (G::F3, '\0'),
+        E::F4 => (G::F4, '\0'),
+        E::F5 => (G::F5, '\0'),
+        E::F6 => (G::F6, '\0'),
+        E::F7 => (G::F7, '\0'),
+        E::F8 => (G::F8, '\0'),
+        E::F9 => (G::F9, '\0'),
+        E::F10 => (G::F10, '\0'),
+        E::F11 => (G::F11, '\0'),
+        E::F12 => (G::F12, '\0'),
+        _ => (G::Unidentified, '\0'),
+    }
+}
diff --git a/src/layout.rs b/src/layout.rs
new file mode 100644
index 0000000..81547f1
--- /dev/null
+++ b/src/layout.rs
@@ -0,0 +1,365 @@
+use egui::Rect;
+
+pub type PaneId = u64;
+
+#[derive(Clone, Copy, Debug)]
+pub enum Axis {
+    Horizontal,
+    Vertical,
+}
+
+#[derive(Clone, Copy)]
+pub enum Direction {
+    Left,
+    Down,
+    Up,
+    Right,
+}
+
+#[derive(Debug)]
+pub enum Layout {
+    Pane(PaneId),
+    Split {
+        axis: Axis,
+        ratio: f32,
+        first: Box<Layout>,
+        second: Box<Layout>,
+    },
+}
+
+impl Layout {
+    pub fn split(&mut self, target: PaneId, new: PaneId, axis: Axis) -> bool {
+        match self {
+            Self::Pane(id) if *id == target => {
+                *self = Self::Split {
+                    axis,
+                    ratio: 0.5,
+                    first: Box::new(Self::Pane(target)),
+                    second: Box::new(Self::Pane(new)),
+                };
+                true
+            }
+            Self::Split { first, second, .. } => {
+                first.split(target, new, axis) || second.split(target, new, axis)
+            }
+            _ => false,
+        }
+    }
+
+    pub fn remove(self, target: PaneId) -> Option<Self> {
+        match self {
+            Self::Pane(id) => (id != target).then_some(Self::Pane(id)),
+            Self::Split {
+                axis,
+                ratio,
+                first,
+                second,
+            } => match (first.remove(target), second.remove(target)) {
+                (Some(first), Some(second)) => Some(Self::Split {
+                    axis,
+                    ratio,
+                    first: Box::new(first),
+                    second: Box::new(second),
+                }),
+                (first, second) => first.or(second),
+            },
+        }
+    }
+
+    pub fn ids(&self, out: &mut Vec<PaneId>) {
+        match self {
+            Self::Pane(id) => out.push(*id),
+            Self::Split { first, second, .. } => {
+                first.ids(out);
+                second.ids(out);
+            }
+        }
+    }
+
+    pub fn first(&self) -> PaneId {
+        match self {
+            Self::Pane(id) => *id,
+            Self::Split { first, .. } => first.first(),
+        }
+    }
+
+    pub fn arrange(
+        &mut self,
+        ui: &mut egui::Ui,
+        rect: Rect,
+        out: &mut Vec<(PaneId, Rect)>,
+        path: u64,
+    ) {
+        match self {
+            Self::Pane(id) => out.push((*id, rect)),
+            Self::Split {
+                axis,
+                ratio,
+                first,
+                second,
+            } => {
+                let horizontal = matches!(axis, Axis::Horizontal);
+                let span = if horizontal {
+                    rect.width()
+                } else {
+                    rect.height()
+                };
+                let start = if horizontal { rect.left() } else { rect.top() };
+                let mut a = rect;
+                let mut b = rect;
+                let mid = start + span * *ratio;
+                if horizontal {
+                    a.max.x = mid;
+                    b.min.x = mid;
+                } else {
+                    a.max.y = mid;
+                    b.min.y = mid;
+                }
+                let divider = if horizontal {
+                    Rect::from_min_max(
+                        egui::pos2(mid - 3.0, rect.top()),
+                        egui::pos2(mid + 3.0, rect.bottom()),
+                    )
+                } else {
+                    Rect::from_min_max(
+                        egui::pos2(rect.left(), mid - 3.0),
+                        egui::pos2(rect.right(), mid + 3.0),
+                    )
+                };
+                let response =
+                    ui.interact(divider, ui.id().with(("split", path)), egui::Sense::drag());
+                response.clone().on_hover_cursor(if horizontal {
+                    egui::CursorIcon::ResizeHorizontal
+                } else {
+                    egui::CursorIcon::ResizeVertical
+                });
+                if response.dragged()
+                    && let Some(pos) = response.interact_pointer_pos()
+                {
+                    *ratio = ((if horizontal { pos.x } else { pos.y } - start) / span.max(1.0))
+                        .clamp(0.1, 0.9);
+                }
+                first.arrange(ui, a, out, path * 2);
+                second.arrange(ui, b, out, path * 2 + 1);
+            }
+        }
+    }
+}
+
+pub struct Tab {
+    pub id: u64,
+    pub root: Option<Layout>,
+    pub floats: Vec<PaneId>,
+    pub active: PaneId,
+    pub floats_visible: bool,
+    pub zoomed: bool,
+}
+
+impl Tab {
+    pub fn new(id: u64, pane: PaneId) -> Self {
+        Self {
+            id,
+            root: Some(Layout::Pane(pane)),
+            floats: vec![],
+            active: pane,
+            floats_visible: false,
+            zoomed: false,
+        }
+    }
+    pub fn ids(&self) -> Vec<PaneId> {
+        let mut ids = vec![];
+        if let Some(root) = &self.root {
+            root.ids(&mut ids);
+        }
+        ids.extend_from_slice(&self.floats);
+        ids
+    }
+    pub fn detach(&mut self, id: PaneId) {
+        self.root = self.root.take().and_then(|r| r.remove(id));
+        self.floats.retain(|p| *p != id);
+        self.zoomed = false;
+    }
+    pub fn is_visible(&self, id: PaneId) -> bool {
+        self.floats_visible || !self.floats.contains(&id)
+    }
+
+    pub fn toggle_floats(&mut self) {
+        self.floats_visible = !self.floats_visible;
+        self.zoomed = false;
+        if self.floats_visible {
+            if let Some(id) = self.floats.last() {
+                self.active = *id;
+            }
+        } else if self.floats.contains(&self.active)
+            && let Some(root) = &self.root
+        {
+            self.active = root.first();
+        }
+    }
+
+    pub fn focus_direction(&mut self, direction: Direction, rects: &[(PaneId, Rect)]) {
+        let Some((_, source)) = rects
+            .iter()
+            .find(|(id, _)| *id == self.active && self.is_visible(*id))
+        else {
+            return;
+        };
+        if !source.is_positive() || !source.is_finite() {
+            return;
+        }
+        let horizontal = matches!(direction, Direction::Left | Direction::Right);
+        let sign = if matches!(direction, Direction::Left | Direction::Up) {
+            -1.0
+        } else {
+            1.0
+        };
+        let ids = self.ids();
+        let next = rects
+            .iter()
+            .filter_map(|(id, rect)| {
+                if *id == self.active
+                    || !ids.contains(id)
+                    || !self.is_visible(*id)
+                    || !rect.is_positive()
+                    || !rect.is_finite()
+                {
+                    return None;
+                }
+                let delta = rect.center() - source.center();
+                let forward = sign * if horizontal { delta.x } else { delta.y };
+                if forward <= 0.5 {
+                    return None;
+                }
+                let overlap = if horizontal {
+                    source.bottom().min(rect.bottom()) - source.top().max(rect.top())
+                } else {
+                    source.right().min(rect.right()) - source.left().max(rect.left())
+                };
+                // Prefer aligned neighbors, then the nearest center, without wrapping.
+                Some((*id, overlap <= 0.0, delta.length_sq()))
+            })
+            .min_by(|a, b| {
+                a.1.cmp(&b.1)
+                    .then_with(|| a.2.total_cmp(&b.2))
+                    .then_with(|| a.0.cmp(&b.0))
+            });
+        if let Some((id, _, _)) = next {
+            self.active = id;
+        }
+    }
+    pub fn cycle(&mut self, backwards: bool) {
+        let ids: Vec<_> = self
+            .ids()
+            .into_iter()
+            .filter(|id| self.floats_visible || !self.floats.contains(id))
+            .collect();
+        if ids.is_empty() {
+            return;
+        }
+        let pos = ids.iter().position(|p| *p == self.active).unwrap_or(0);
+        self.active = ids[(pos + if backwards { ids.len() - 1 } else { 1 }) % ids.len()];
+    }
+}
+
+#[cfg(test)]
+mod tests {
+    use super::*;
+    #[test]
+    fn removal_collapses_splits_without_losing_siblings() {
+        let mut root = Layout::Pane(1);
+        assert!(root.split(1, 2, Axis::Horizontal));
+        assert!(root.split(2, 3, Axis::Vertical));
+        assert!(!root.split(99, 4, Axis::Vertical));
+        let root = root.remove(2).unwrap();
+        let mut ids = vec![];
+        root.ids(&mut ids);
+        assert_eq!(ids, vec![1, 3]);
+        let root = root.remove(1).unwrap();
+        assert_eq!(root.first(), 3);
+        assert!(root.remove(3).is_none());
+    }
+    #[test]
+    fn focus_skips_hidden_floats() {
+        let mut tab = Tab::new(1, 1);
+        tab.floats.push(2);
+        tab.floats_visible = true;
+        tab.cycle(false);
+        assert_eq!(tab.active, 2);
+        tab.floats_visible = false;
+        tab.cycle(false);
+        assert_eq!(tab.active, 1);
+    }
+
+    #[test]
+    fn floating_visibility_controls_focus_even_without_tiles() {
+        let mut tab = Tab::new(1, 1);
+        assert!(!tab.floats_visible);
+        tab.toggle_floats();
+        assert!(tab.floats_visible);
+        tab.floats.push(2);
+        tab.active = 2;
+        tab.toggle_floats();
+        assert_eq!(tab.active, 1);
+        assert!(!tab.is_visible(2));
+        tab.toggle_floats();
+        assert_eq!(tab.active, 2);
+        tab.root = None;
+        tab.toggle_floats();
+        assert!(!tab.is_visible(2));
+        tab.toggle_floats();
+        assert!(tab.is_visible(2));
+    }
+
+    #[test]
+    fn directional_focus_uses_geometry_and_ignores_hidden_or_foreign_panes() {
+        let mut tab = Tab::new(1, 1);
+        let root = tab.root.as_mut().unwrap();
+        root.split(1, 2, Axis::Horizontal);
+        root.split(1, 3, Axis::Vertical);
+        root.split(2, 4, Axis::Vertical);
+        tab.floats.push(5);
+        let rect = |x, y| Rect::from_min_size(egui::pos2(x, y), egui::vec2(100.0, 100.0));
+        let panes = [
+            (1, rect(0.0, 0.0)),
+            (2, rect(100.0, 0.0)),
+            (3, rect(0.0, 100.0)),
+            (4, rect(100.0, 100.0)),
+            (5, rect(20.0, 0.0)),
+            (99, rect(10.0, 0.0)),
+        ];
+        tab.focus_direction(Direction::Right, &panes);
+        assert_eq!(tab.active, 2);
+        tab.focus_direction(Direction::Down, &panes);
+        assert_eq!(tab.active, 4);
+        tab.focus_direction(Direction::Left, &panes);
+        assert_eq!(tab.active, 3);
+        tab.focus_direction(Direction::Up, &panes);
+        assert_eq!(tab.active, 1);
+        tab.focus_direction(Direction::Left, &panes);
+        assert_eq!(tab.active, 1);
+        tab.floats_visible = true;
+        tab.focus_direction(Direction::Right, &panes);
+        assert_eq!(tab.active, 5);
+    }
+
+    #[test]
+    fn split_rectangles_touch_without_gaps() {
+        let ctx = egui::Context::default();
+        let mut layout = Layout::Pane(1);
+        layout.split(1, 2, Axis::Horizontal);
+        layout.split(2, 3, Axis::Vertical);
+        let mut rects = vec![];
+        let workspace = Rect::from_min_size(egui::pos2(0.0, 0.0), egui::vec2(800.0, 600.0));
+        let _ = ctx.run(egui::RawInput::default(), |ctx| {
+            egui::CentralPanel::default()
+                .show(ctx, |ui| layout.arrange(ui, workspace, &mut rects, 1));
+        });
+        assert_eq!(rects.len(), 3);
+        assert_eq!(rects[0].1.right(), rects[1].1.left());
+        assert_eq!(rects[1].1.bottom(), rects[2].1.top());
+        assert_eq!(
+            rects.iter().map(|(_, rect)| rect.area()).sum::<f32>(),
+            workspace.area()
+        );
+    }
+}
diff --git a/src/main.rs b/src/main.rs
new file mode 100644
index 0000000..8d091ac
--- /dev/null
+++ b/src/main.rs
@@ -0,0 +1,85 @@
+mod app;
+mod config;
+mod input;
+mod layout;
+mod pane;
+mod pty;
+mod render;
+#[cfg(test)]
+mod tests;
+
+use anyhow::{Context, Result, bail};
+
+fn main() -> Result<()> {
+    let mut path = config::Config::path()?;
+    let mut check = false;
+    let mut init = false;
+    let mut args = std::env::args().skip(1);
+    while let Some(arg) = args.next() {
+        match arg.as_str() {
+            "--config" => path = args.next().context("--config needs a path")?.into(),
+            "--check-config" => check = true,
+            "--init-config" => init = true,
+            "--version" => {
+                println!("rust-term {}", env!("CARGO_PKG_VERSION"));
+                return Ok(());
+            }
+            "--help" | "-h" => {
+                println!(
+                    "rust-term [--config PATH] [--check-config | --init-config]\n\nDefault config: {}",
+                    path.display()
+                );
+                return Ok(());
+            }
+            _ => bail!("Unknown argument: {arg}"),
+        }
+    }
+    if init {
+        use std::io::Write;
+        if let Some(parent) = path.parent().filter(|p| !p.as_os_str().is_empty()) {
+            std::fs::create_dir_all(parent)?;
+        }
+        let mut file = std::fs::OpenOptions::new()
+            .write(true)
+            .create_new(true)
+            .open(&path)
+            .with_context(|| {
+                format!(
+                    "Cannot create {} (existing files are never overwritten)",
+                    path.display()
+                )
+            })?;
+        file.write_all(config::EXAMPLE.as_bytes())?;
+        println!("Created {}", path.display());
+        return Ok(());
+    }
+    let config = config::Config::load(&path)?;
+    if check {
+        println!(
+            "Configuration valid: {}{}",
+            path.display(),
+            if path.exists() {
+                ""
+            } else {
+                " (built-in defaults)"
+            }
+        );
+        return Ok(());
+    }
+    libghostty_vt::kitty::graphics::set_png_decoder(Some(Box::new(render::PngDecoder)))?;
+    let options = eframe::NativeOptions {
+        viewport: egui::ViewportBuilder::default()
+            .with_title("rust-term")
+            .with_inner_size([config.window_width, config.window_height])
+            .with_min_inner_size([320.0, 200.0])
+            .with_app_id("rust-term"),
+        renderer: eframe::Renderer::Wgpu,
+        ..Default::default()
+    };
+    eframe::run_native(
+        "rust-term",
+        options,
+        Box::new(move |cc| Ok(Box::new(app::App::new(cc, config, path)?))),
+    )
+    .map_err(|e| anyhow::anyhow!("Cannot start rust-term: {e}"))
+}
diff --git a/src/pane.rs b/src/pane.rs
new file mode 100644
index 0000000..0acfa4f
--- /dev/null
+++ b/src/pane.rs
@@ -0,0 +1,364 @@
+use crate::{
+    config::{Config, rgb},
+    input,
+    pty::Pty,
+    render::Renderer,
+};
+use anyhow::{Result, ensure};
+use egui::{FontId, Rect, Sense, vec2};
+use libghostty_vt::{
+    Terminal, TerminalOptions, mouse,
+    selection::{FormatOptions, Selection},
+    terminal::{self, Mode, Point, PointCoordinate, ScrollViewport},
+};
+use std::{cell::RefCell, rc::Rc, sync::mpsc::TryRecvError};
+
+pub struct Pane {
+    pub terminal: Terminal<'static, 'static>,
+    pub renderer: Renderer,
+    pub pty: Pty,
+    pub dead: bool,
+    pub error: Option<String>,
+    pub last_rect: Rect,
+    size: (u16, u16, u32, u32),
+    report_size: Rc<RefCell<terminal::SizeReportSize>>,
+    callback_error: Rc<RefCell<Option<String>>>,
+    mouse_encoder: mouse::Encoder<'static>,
+    mouse_event: mouse::Event<'static>,
+    selection_start: Option<PointCoordinate>,
+    focused: bool,
+}
+
+pub fn terminal(config: &Config) -> Result<Terminal<'static, 'static>> {
+    let mut term = Terminal::new(TerminalOptions {
+        cols: 80,
+        rows: 24,
+        max_scrollback: config.scrollback,
+    })?;
+    term.resize(80, 24, 8, 16)?;
+    apply_config(&mut term, config)?;
+    term.on_xtversion(|_| Some("rust-term 0.1.0"))?;
+    term.on_device_attributes(|_| {
+        Some(terminal::DeviceAttributes {
+            primary: terminal::PrimaryDeviceAttributes::new(
+                terminal::ConformanceLevel::VT220,
+                &[terminal::DeviceAttributeFeature::ANSI_COLOR],
+            ),
+            secondary: terminal::SecondaryDeviceAttributes {
+                device_type: terminal::DeviceType::VT220,
+                firmware_version: 1,
+                rom_cartridge: 0,
+            },
+            tertiary: Default::default(),
+        })
+    })?;
+    term.on_color_scheme(|_| Some(terminal::ColorScheme::Dark))?;
+    Ok(term)
+}
+
+pub fn apply_config(term: &mut Terminal<'_, '_>, config: &Config) -> Result<()> {
+    term.set_default_fg_color(Some(rgb(&config.foreground)?))?
+        .set_default_bg_color(Some(rgb(&config.background)?))?
+        .set_default_cursor_color(Some(rgb(&config.accent)?))?
+        .set_kitty_image_storage_limit(config.kitty.image_storage_mb * 1024 * 1024)?
+        .set_kitty_image_from_file_allowed(config.kitty.allow_file)?
+        .set_kitty_image_from_temp_file_allowed(config.kitty.allow_temp_file)?
+        .set_kitty_image_from_shared_mem_allowed(config.kitty.allow_shared_memory)?;
+    Ok(())
+}
+
+impl Pane {
+    pub fn new(config: &Config, ctx: &egui::Context) -> Result<Self> {
+        let mut terminal = terminal(config)?;
+        let renderer = Renderer::new()?;
+        let mouse_encoder = mouse::Encoder::new()?;
+        let mouse_event = mouse::Event::new()?;
+        let pty = Pty::spawn(config, ctx)?;
+        let input = pty.input.clone();
+        let callback_error = Rc::new(RefCell::new(None));
+        let errors = callback_error.clone();
+        terminal.on_pty_write(move |_, data| {
+            if let Err(e) = input.try_send(data.to_vec()) {
+                *errors.borrow_mut() = Some(format!("PTY response queue: {e}"));
+            }
+        })?;
+        let report_size = Rc::new(RefCell::new(terminal::SizeReportSize {
+            rows: 24,
+            columns: 80,
+            cell_width: 8,
+            cell_height: 16,
+        }));
+        let size = report_size.clone();
+        terminal.on_size(move |_| Some(*size.borrow()))?;
+        Ok(Self {
+            terminal,
+            renderer,
+            pty,
+            dead: false,
+            error: None,
+            last_rect: Rect::NOTHING,
+            size: (80, 24, 8, 16),
+            report_size,
+            callback_error,
+            mouse_encoder,
+            mouse_event,
+            selection_start: None,
+            focused: false,
+        })
+    }
+
+    pub fn drain(&mut self, ctx: &egui::Context) {
+        // Bound work per frame as well as queued bytes, so one busy PTY cannot starve others.
+        for _ in 0..64 {
+            match self.pty.output.try_recv() {
+                Ok(data) => self.terminal.vt_write(&data),
+                Err(TryRecvError::Empty | TryRecvError::Disconnected) => break,
+            }
+        }
+        if self.pty.exited.try_recv().is_ok() {
+            self.dead = true;
+        }
+        if let Ok(e) = self.pty.errors.try_recv() {
+            self.error = Some(e);
+        }
+        if let Some(e) = self.callback_error.borrow_mut().take() {
+            self.error = Some(e);
+        }
+        if !self.dead {
+            ctx.request_repaint_after(std::time::Duration::from_millis(100));
+        }
+    }
+
+    pub fn send(&mut self, bytes: Vec<u8>) -> Result<()> {
+        if bytes.is_empty() {
+            return Ok(());
+        }
+        ensure!(!self.dead, "shell has exited");
+        self.pty
+            .input
+            .try_send(bytes)
+            .map_err(|e| anyhow::anyhow!("PTY input queue: {e}"))?;
+        self.terminal.scroll_viewport(ScrollViewport::Bottom);
+        Ok(())
+    }
+
+    pub fn paste(&mut self, text: &str) -> Result<()> {
+        ensure!(text.len() <= 4 * 1024 * 1024, "paste exceeds 4 MiB");
+        // ESC can terminate bracketed paste early. Strip it and NUL from clipboard input.
+        let text = text
+            .replace(['\x1b', '\0'], "")
+            .replace("\r\n", "\n")
+            .replace('\n', "\r");
+        let data = if self.terminal.mode(Mode::BRACKETED_PASTE)? {
+            format!("\x1b[200~{text}\x1b[201~").into_bytes()
+        } else {
+            text.into_bytes()
+        };
+        self.send(data)
+    }
+
+    pub fn copy(&self) -> Result<Option<String>> {
+        Ok(self
+            .terminal
+            .format_selection_alloc(None, FormatOptions::new().with_trim(true).with_unwrap(true))?
+            .map(|b| String::from_utf8_lossy(&b).into_owned()))
+    }
+
+    pub fn focus(&mut self, focused: bool) -> Result<()> {
+        if focused != self.focused {
+            self.focused = focused;
+            if self
+                .terminal
+                .mode(Mode::new(1004, terminal::ModeKind::Dec))?
+            {
+                self.send(if focused { b"\x1b[I" } else { b"\x1b[O" }.to_vec())?;
+            }
+        }
+        Ok(())
+    }
+
+    pub fn show(
+        &mut self,
+        ui: &mut egui::Ui,
+        rect: Rect,
+        config: &Config,
+        active: bool,
+    ) -> Result<bool> {
+        let font = FontId::monospace(config.font_size);
+        let cw = ui
+            .painter()
+            .layout_no_wrap("M".into(), font.clone(), egui::Color32::WHITE)
+            .size()
+            .x
+            .ceil()
+            .max(1.0);
+        let ch = (config.font_size * 1.3).ceil();
+        let cell = vec2(cw, ch);
+        let grid = rect.shrink(6.0);
+        if grid.width() < cw || grid.height() < ch {
+            return Ok(false);
+        }
+        let size = (
+            (grid.width() / cw).floor().clamp(1.0, 1000.0) as u16,
+            (grid.height() / ch).floor().clamp(1.0, 1000.0) as u16,
+            cw as u32,
+            ch as u32,
+        );
+        if size != self.size {
+            self.pty.resize(size.0, size.1, size.2, size.3)?;
+            self.terminal.resize(size.0, size.1, size.2, size.3)?;
+            self.size = size;
+            *self.report_size.borrow_mut() = terminal::SizeReportSize {
+                columns: size.0,
+                rows: size.1,
+                cell_width: size.2,
+                cell_height: size.3,
+            };
+        }
+        let response = ui.interact(grid, ui.id().with("terminal"), Sense::click_and_drag());
+        self.pointer(ui, &response, grid, cell)?;
+        self.renderer
+            .paint(&self.terminal, ui.painter(), grid, cell, &font, active)?;
+        if let Some(error) = &self.error {
+            ui.painter().text(
+                grid.left_bottom() - vec2(0.0, ch),
+                egui::Align2::LEFT_TOP,
+                error,
+                FontId::proportional(12.0),
+                egui::Color32::LIGHT_RED,
+            );
+        }
+        Ok(response.clicked()
+            || response.drag_started()
+            || (response.hovered() && ui.input(|i| i.pointer.any_pressed())))
+    }
+
+    fn pointer(
+        &mut self,
+        ui: &egui::Ui,
+        response: &egui::Response,
+        grid: Rect,
+        cell: egui::Vec2,
+    ) -> Result<()> {
+        let modifiers = ui.input(|i| i.modifiers);
+        let tracking = self.terminal.is_mouse_tracking()? && !modifiers.shift;
+        let pos = response
+            .interact_pointer_pos()
+            .or_else(|| ui.input(|i| i.pointer.hover_pos()));
+        let Some(pos) = pos else {
+            return Ok(());
+        };
+        let local = pos - grid.min;
+        if tracking && response.hovered() {
+            let events = ui.input(|i| i.events.clone());
+            self.mouse_encoder
+                .set_options_from_terminal(&self.terminal)
+                .set_size(mouse::EncoderSize {
+                    screen_width: self.size.0 as u32 * self.size.2,
+                    screen_height: self.size.1 as u32 * self.size.3,
+                    cell_width: self.size.2,
+                    cell_height: self.size.3,
+                    padding_top: 0,
+                    padding_bottom: 0,
+                    padding_left: 0,
+                    padding_right: 0,
+                })
+                .set_any_button_pressed(ui.input(|i| i.pointer.any_down()))
+                .set_track_last_cell(true);
+            self.mouse_event
+                .set_position(mouse::Position {
+                    x: local.x,
+                    y: local.y,
+                })
+                .set_mods(input::mods(modifiers));
+            let mut data = vec![];
+            for event in events {
+                match event {
+                    egui::Event::PointerButton {
+                        button, pressed, ..
+                    } => {
+                        let button = match button {
+                            egui::PointerButton::Primary => mouse::Button::Left,
+                            egui::PointerButton::Secondary => mouse::Button::Right,
+                            egui::PointerButton::Middle => mouse::Button::Middle,
+                            _ => continue,
+                        };
+                        self.mouse_event
+                            .set_action(if pressed {
+                                mouse::Action::Press
+                            } else {
+                                mouse::Action::Release
+                            })
+                            .set_button(Some(button));
+                        self.mouse_encoder
+                            .encode_to_vec(&self.mouse_event, &mut data)?;
+                    }
+                    egui::Event::PointerMoved(_) => {
+                        let button = ui.input(|i| {
+                            if i.pointer.primary_down() {
+                                Some(mouse::Button::Left)
+                            } else if i.pointer.secondary_down() {
+                                Some(mouse::Button::Right)
+                            } else {
+                                None
+                            }
+                        });
+                        self.mouse_event
+                            .set_action(mouse::Action::Motion)
+                            .set_button(button);
+                        self.mouse_encoder
+                            .encode_to_vec(&self.mouse_event, &mut data)?;
+                    }
+                    egui::Event::MouseWheel { delta, .. } => {
+                        self.mouse_event
+                            .set_action(mouse::Action::Press)
+                            .set_button(Some(if delta.y > 0.0 {
+                                mouse::Button::Four
+                            } else {
+                                mouse::Button::Five
+                            }));
+                        for _ in 0..3 {
+                            self.mouse_encoder
+                                .encode_to_vec(&self.mouse_event, &mut data)?;
+                        }
+                    }
+                    _ => {}
+                }
+            }
+            self.send(data)?;
+        } else if !tracking {
+            let point = PointCoordinate {
+                x: (local.x / cell.x)
+                    .floor()
+                    .clamp(0.0, (self.size.0 - 1) as f32) as u16,
+                y: (local.y / cell.y)
+                    .floor()
+                    .clamp(0.0, (self.size.1 - 1) as f32) as u32,
+            };
+            if response.drag_started() {
+                self.selection_start = Some(point);
+            }
+            if response.clicked() {
+                self.terminal.set_selection(None)?;
+                self.selection_start = None;
+            }
+            if response.dragged()
+                && let Some(start) = self.selection_start
+            {
+                let a = self.terminal.grid_ref(Point::Viewport(start))?;
+                let b = self.terminal.grid_ref(Point::Viewport(point))?;
+                self.terminal
+                    .set_selection(Some(&Selection::new(a, b, modifiers.alt)))?;
+            }
+            if response.hovered() {
+                let scroll = ui.input(|i| i.raw_scroll_delta.y);
+                if scroll.abs() >= 1.0 {
+                    self.terminal.scroll_viewport(ScrollViewport::Delta(
+                        -(scroll / cell.y).round() as isize,
+                    ));
+                }
+            }
+        }
+        Ok(())
+    }
+}
diff --git a/src/pty.rs b/src/pty.rs
new file mode 100644
index 0000000..4d35f66
--- /dev/null
+++ b/src/pty.rs
@@ -0,0 +1,131 @@
+use crate::config::Config;
+use anyhow::{Context, Result};
+use portable_pty::{CommandBuilder, MasterPty, PtySize, native_pty_system};
+use std::{
+    io::{Read, Write},
+    sync::mpsc::{self, Receiver, Sender, SyncSender},
+    thread,
+};
+
+pub struct Pty {
+    pub output: Receiver<Vec<u8>>,
+    pub input: SyncSender<Vec<u8>>,
+    pub errors: Receiver<String>,
+    pub exited: Receiver<()>,
+    master: Box<dyn MasterPty + Send>,
+    shutdown: Sender<()>,
+    reaper: Option<thread::JoinHandle<()>>,
+}
+
+impl Pty {
+    pub fn spawn(config: &Config, ctx: &egui::Context) -> Result<Self> {
+        let pair = native_pty_system().openpty(PtySize {
+            rows: 24,
+            cols: 80,
+            pixel_width: 640,
+            pixel_height: 384,
+        })?;
+        let mut cmd = CommandBuilder::new(&config.shell[0]);
+        cmd.args(&config.shell[1..]);
+        cmd.env("TERM", "xterm-256color");
+        cmd.env("COLORTERM", "truecolor");
+        cmd.env("TERM_PROGRAM", "rust-term");
+        cmd.env("TERM_PROGRAM_VERSION", env!("CARGO_PKG_VERSION"));
+        if let Some(dir) = &config.working_directory {
+            cmd.cwd(dir);
+        }
+        let mut reader = pair.master.try_clone_reader()?;
+        let mut writer = pair.master.take_writer()?;
+        let mut child = pair
+            .slave
+            .spawn_command(cmd)
+            .context("Cannot spawn shell")?;
+        drop(pair.slave);
+        let (output_tx, output) = mpsc::sync_channel(64);
+        let (input, input_rx) = mpsc::sync_channel::<Vec<u8>>(64);
+        let (error_tx, errors) = mpsc::channel();
+        let (exit_tx, exited) = mpsc::channel();
+        let (shutdown, shutdown_rx) = mpsc::channel();
+        let read_ctx = ctx.clone();
+        let write_ctx = ctx.clone();
+        let exit_ctx = ctx.clone();
+        let read_errors = error_tx.clone();
+        thread::spawn(move || {
+            let mut buf = [0; 16384];
+            loop {
+                match reader.read(&mut buf) {
+                    Ok(0) => break,
+                    Ok(n) => {
+                        if output_tx.send(buf[..n].to_vec()).is_err() {
+                            break;
+                        }
+                        read_ctx.request_repaint();
+                    }
+                    Err(e) if e.kind() == std::io::ErrorKind::Interrupted => continue,
+                    // Linux PTYs report EIO when the slave closes.
+                    Err(e) if e.raw_os_error() == Some(5) => break,
+                    Err(e) => {
+                        let _ = read_errors.send(format!("PTY read: {e}"));
+                        read_ctx.request_repaint();
+                        break;
+                    }
+                }
+            }
+        });
+        thread::spawn(move || {
+            while let Ok(bytes) = input_rx.recv() {
+                if let Err(e) = writer.write_all(&bytes).and_then(|_| writer.flush()) {
+                    let _ = error_tx.send(format!("PTY write: {e}"));
+                    write_ctx.request_repaint();
+                    break;
+                }
+            }
+        });
+        let reaper = thread::spawn(move || {
+            loop {
+                if matches!(child.try_wait(), Ok(Some(_))) {
+                    break;
+                }
+                if !matches!(
+                    shutdown_rx.recv_timeout(std::time::Duration::from_millis(25)),
+                    Err(mpsc::RecvTimeoutError::Timeout)
+                ) {
+                    // The worker owns the unreaped child, so shutdown cannot signal a reused PID.
+                    let _ = child.kill();
+                    let _ = child.wait();
+                    break;
+                }
+            }
+            let _ = exit_tx.send(());
+            exit_ctx.request_repaint();
+        });
+        Ok(Self {
+            output,
+            input,
+            errors,
+            exited,
+            master: pair.master,
+            shutdown,
+            reaper: Some(reaper),
+        })
+    }
+
+    pub fn resize(&self, cols: u16, rows: u16, cw: u32, ch: u32) -> Result<()> {
+        self.master.resize(PtySize {
+            cols,
+            rows,
+            pixel_width: (cols as u32 * cw).min(u16::MAX as u32) as u16,
+            pixel_height: (rows as u32 * ch).min(u16::MAX as u32) as u16,
+        })?;
+        Ok(())
+    }
+}
+
+impl Drop for Pty {
+    fn drop(&mut self) {
+        let _ = self.shutdown.send(());
+        if let Some(reaper) = self.reaper.take() {
+            let _ = reaper.join();
+        }
+    }
+}
diff --git a/src/render.rs b/src/render.rs
new file mode 100644
index 0000000..8aab511
--- /dev/null
+++ b/src/render.rs
@@ -0,0 +1,303 @@
+use anyhow::{Result, ensure};
+use egui::{
+    Color32, ColorImage, FontId, Painter, Rect, Stroke, TextureHandle, TextureOptions, pos2, vec2,
+};
+use libghostty_vt::{
+    RenderState, Terminal,
+    alloc::{Allocator, Bytes},
+    kitty::graphics::{DecodePng, DecodedImage, ImageFormat, Layer, PlacementIterator},
+    render::{CellIterator, CursorVisualStyle, Dirty, RowIterator},
+    style::{RgbColor, Underline},
+};
+use std::{
+    collections::{HashMap, HashSet},
+    io::Cursor,
+};
+
+pub fn color(c: RgbColor) -> Color32 {
+    Color32::from_rgb(c.r, c.g, c.b)
+}
+
+pub struct PngDecoder;
+impl DecodePng for PngDecoder {
+    fn decode_png<'a>(
+        &mut self,
+        alloc: &'a Allocator<'_>,
+        bytes: &[u8],
+    ) -> Option<DecodedImage<'a>> {
+        let mut decoder = png::Decoder::new(Cursor::new(bytes));
+        decoder.set_transformations(png::Transformations::EXPAND | png::Transformations::STRIP_16);
+        decoder.set_limits(png::Limits {
+            bytes: 128 * 1024 * 1024,
+        });
+        let mut reader = decoder.read_info().ok()?;
+        let size = reader.output_buffer_size()?;
+        if size > 128 * 1024 * 1024 {
+            return None;
+        }
+        let mut pixels = vec![0; size];
+        let info = reader.next_frame(&mut pixels).ok()?;
+        let count = (info.width as usize).checked_mul(info.height as usize)?;
+        let len = count.checked_mul(4)?;
+        if len > 128 * 1024 * 1024 {
+            return None;
+        }
+        let mut data = Bytes::new_with_alloc(alloc, len).ok()?;
+        let input = &pixels[..info.buffer_size()];
+        match info.color_type {
+            png::ColorType::Rgba => data.copy_from_slice(input),
+            png::ColorType::Rgb => {
+                for (out, src) in data.chunks_exact_mut(4).zip(input.chunks_exact(3)) {
+                    out.copy_from_slice(&[src[0], src[1], src[2], 255]);
+                }
+            }
+            png::ColorType::Grayscale => {
+                for (out, value) in data.chunks_exact_mut(4).zip(input) {
+                    out.copy_from_slice(&[*value, *value, *value, 255]);
+                }
+            }
+            png::ColorType::GrayscaleAlpha => {
+                for (out, src) in data.chunks_exact_mut(4).zip(input.chunks_exact(2)) {
+                    out.copy_from_slice(&[src[0], src[0], src[0], src[1]]);
+                }
+            }
+            _ => return None,
+        }
+        Some(DecodedImage {
+            width: info.width,
+            height: info.height,
+            data,
+        })
+    }
+}
+
+pub struct Renderer {
+    state: RenderState<'static>,
+    rows: RowIterator<'static>,
+    cells: CellIterator<'static>,
+    placements: PlacementIterator<'static>,
+    textures: HashMap<u32, (u64, TextureHandle)>,
+}
+
+impl Renderer {
+    pub fn new() -> Result<Self> {
+        Ok(Self {
+            state: RenderState::new()?,
+            rows: RowIterator::new()?,
+            cells: CellIterator::new()?,
+            placements: PlacementIterator::new()?,
+            textures: HashMap::new(),
+        })
+    }
+
+    pub fn paint(
+        &mut self,
+        term: &Terminal<'static, '_>,
+        painter: &Painter,
+        rect: Rect,
+        cell: egui::Vec2,
+        font: &FontId,
+        active: bool,
+    ) -> Result<()> {
+        let painter = painter.with_clip_rect(rect.intersect(painter.clip_rect()));
+        let snapshot = self.state.update(term)?;
+        let colors = snapshot.colors()?;
+        painter.rect_filled(rect, 0, color(colors.background));
+        let mut backgrounds = vec![];
+        let mut foregrounds = vec![];
+        let mut rows = self.rows.update(&snapshot)?;
+        let mut text = String::new();
+        let mut y = 0;
+        while let Some(row) = rows.next() {
+            let mut cells = self.cells.update(row)?;
+            let mut x = 0;
+            while let Some(c) = cells.next() {
+                let pos = rect.min + vec2(x as f32 * cell.x, y as f32 * cell.y);
+                let cell_rect = Rect::from_min_size(pos, cell);
+                let style = c.style()?;
+                let mut fg = color(c.fg_color()?.unwrap_or(colors.foreground));
+                let explicit_bg = c.bg_color()?;
+                let mut bg = color(explicit_bg.unwrap_or(colors.background));
+                let selected = c.is_selected()?;
+                if style.inverse ^ selected {
+                    std::mem::swap(&mut fg, &mut bg);
+                }
+                if explicit_bg.is_some() || style.inverse || selected {
+                    backgrounds.push(egui::Shape::rect_filled(cell_rect, 0, bg));
+                }
+                if style.faint {
+                    fg = fg.gamma_multiply(0.6);
+                }
+                if !style.invisible && c.graphemes_len()? > 0 {
+                    c.graphemes_utf8(&mut text)?;
+                    // Placeholder cells are reserved by the Kitty protocol, not printable text.
+                    if !text.starts_with('\u{10eeee}') {
+                        let galley = painter.layout_no_wrap(text.clone(), font.clone(), fg);
+                        foregrounds.push(egui::Shape::galley(pos, galley.clone(), fg));
+                        if style.bold {
+                            foregrounds.push(egui::Shape::galley(
+                                pos + vec2(0.45, 0.0),
+                                galley,
+                                fg,
+                            ));
+                        }
+                    }
+                }
+                for (enabled, height) in [
+                    (style.underline != Underline::None, cell.y - 2.0),
+                    (style.strikethrough, cell.y * 0.55),
+                    (style.overline, 1.0),
+                ] {
+                    if enabled {
+                        foregrounds.push(egui::Shape::line_segment(
+                            [pos + vec2(0.0, height), pos + vec2(cell.x, height)],
+                            Stroke::new(1.0, fg),
+                        ));
+                    }
+                }
+                x += 1;
+            }
+            row.set_dirty(false)?;
+            y += 1;
+        }
+        // Separate passes preserve Kitty's three z-order bands exactly.
+        let mut seen = HashSet::new();
+        for layer in [Layer::BelowBg, Layer::BelowText, Layer::AboveText] {
+            if layer == Layer::BelowText {
+                painter.extend(std::mem::take(&mut backgrounds));
+            }
+            if layer == Layer::AboveText {
+                painter.extend(std::mem::take(&mut foregrounds));
+            }
+            paint_images(
+                term,
+                &painter,
+                rect,
+                cell,
+                layer,
+                &mut self.placements,
+                &mut self.textures,
+                &mut seen,
+            )?;
+        }
+        self.textures.retain(|id, _| seen.contains(id));
+        if snapshot.cursor_visible()?
+            && let Some(cursor) = snapshot.cursor_viewport()?
+        {
+            let mut cursor_rect = Rect::from_min_size(
+                rect.min + vec2(cursor.x as f32 * cell.x, cursor.y as f32 * cell.y),
+                cell,
+            );
+            let c = color(colors.cursor.unwrap_or(colors.foreground));
+            match snapshot.cursor_visual_style()? {
+                CursorVisualStyle::Bar if active => {
+                    cursor_rect.max.x = cursor_rect.min.x + 2.0;
+                    painter.rect_filled(cursor_rect, 0, c);
+                }
+                CursorVisualStyle::Underline if active => {
+                    cursor_rect.min.y = cursor_rect.max.y - 2.0;
+                    painter.rect_filled(cursor_rect, 0, c);
+                }
+                _ => {
+                    painter.rect_stroke(
+                        cursor_rect,
+                        0,
+                        Stroke::new(if active { 1.5 } else { 0.75 }, c),
+                        egui::StrokeKind::Inside,
+                    );
+                }
+            }
+        }
+        snapshot.set_dirty(Dirty::Clean)?;
+        Ok(())
+    }
+}
+
+#[allow(clippy::too_many_arguments)]
+fn paint_images(
+    term: &Terminal<'_, '_>,
+    painter: &Painter,
+    rect: Rect,
+    cell: egui::Vec2,
+    layer: Layer,
+    iterator: &mut PlacementIterator<'_>,
+    textures: &mut HashMap<u32, (u64, TextureHandle)>,
+    seen: &mut HashSet<u32>,
+) -> Result<()> {
+    let graphics = term.kitty_graphics()?;
+    let mut placements = iterator.update(&graphics)?;
+    placements.set_layer(layer)?;
+    let mut images = vec![];
+    while let Some(p) = placements.next() {
+        let id = p.image_id()?;
+        let Some(image) = graphics.image(id) else {
+            continue;
+        };
+        let info = p.placement_render_info(&image, term)?;
+        if !info.viewport_visible || info.pixel_width == 0 || info.pixel_height == 0 {
+            continue;
+        }
+        let size = [image.width()? as usize, image.height()? as usize];
+        if size.contains(&0) {
+            continue;
+        }
+        ensure!(
+            size[0] <= painter.ctx().input(|i| i.max_texture_side)
+                && size[1] <= painter.ctx().input(|i| i.max_texture_side),
+            "Kitty image exceeds GPU texture size limit"
+        );
+        seen.insert(id);
+        let generation = image.generation()?;
+        if textures.get(&id).is_none_or(|(g, _)| *g != generation) {
+            let data = image.data()?;
+            let pixels = match image.format()? {
+                ImageFormat::Rgba => ColorImage::from_rgba_unmultiplied(size, data),
+                ImageFormat::Rgb => ColorImage::from_rgb(size, data),
+                _ => continue,
+            };
+            textures.insert(
+                id,
+                (
+                    generation,
+                    painter.ctx().load_texture(
+                        format!("kitty-{id}"),
+                        pixels,
+                        TextureOptions::LINEAR,
+                    ),
+                ),
+            );
+        }
+        let scale = vec2(1.0, 1.0);
+        let dest = Rect::from_min_size(
+            rect.min
+                + vec2(
+                    info.viewport_col as f32 * cell.x,
+                    info.viewport_row as f32 * cell.y,
+                )
+                + vec2(
+                    p.x_offset()? as f32 * scale.x,
+                    p.y_offset()? as f32 * scale.y,
+                ),
+            vec2(
+                info.pixel_width as f32 * scale.x,
+                info.pixel_height as f32 * scale.y,
+            ),
+        );
+        let uv = Rect::from_min_max(
+            pos2(
+                info.source_x as f32 / size[0] as f32,
+                info.source_y as f32 / size[1] as f32,
+            ),
+            pos2(
+                (info.source_x + info.source_width) as f32 / size[0] as f32,
+                (info.source_y + info.source_height) as f32 / size[1] as f32,
+            ),
+        );
+        images.push((p.z()?, id, p.placement_id()?, dest, uv));
+    }
+    images.sort_by_key(|(z, id, pid, _, _)| (*z, *id, *pid));
+    for (_, id, _, dest, uv) in images {
+        painter.image(textures[&id].1.id(), dest, uv, Color32::WHITE);
+    }
+    Ok(())
+}
diff --git a/src/tests.rs b/src/tests.rs
new file mode 100644
index 0000000..dfb354d
--- /dev/null
+++ b/src/tests.rs
@@ -0,0 +1,207 @@
+use crate::{config::Config, input, pane, render};
+use base64::Engine;
+use egui::{Event, Key, Modifiers};
+use libghostty_vt::{
+    fmt,
+    kitty::graphics::{self, ImageFormat, PlacementIterator},
+};
+use std::{
+    cell::RefCell,
+    rc::Rc,
+    time::{Duration, Instant},
+};
+
+fn plain(term: &libghostty_vt::Terminal<'_, '_>) -> String {
+    let mut formatter =
+        fmt::Formatter::new(term, fmt::FormatterOptions::new().with_trim(true)).unwrap();
+    let bytes = formatter.format_alloc(None).unwrap();
+    String::from_utf8_lossy(&bytes).into_owned()
+}
+
+fn key(key: Key, modifiers: Modifiers) -> Event {
+    Event::Key {
+        key,
+        physical_key: Some(key),
+        pressed: true,
+        repeat: false,
+        modifiers,
+    }
+}
+
+#[test]
+fn terminal_preserves_unicode_colors_and_application_input_modes() {
+    let mut term = pane::terminal(&Config::default()).unwrap();
+    term.vt_write("hello \x1b[31mred\x1b[0m \u{754c}e\u{301}\r\n".as_bytes());
+    assert!(plain(&term).contains("hello red \u{754c}e\u{301}"));
+    let events = [
+        key(Key::A, Modifiers::NONE),
+        Event::Text("a".into()),
+        key(Key::B, Modifiers::NONE),
+        Event::Text("b".into()),
+    ];
+    assert_eq!(input::encode(&term, &events).unwrap(), b"ab");
+    assert_eq!(
+        input::encode(&term, &[key(Key::C, Modifiers::CTRL)]).unwrap(),
+        b"\x03"
+    );
+    assert_eq!(
+        input::encode(&term, &[key(Key::ArrowUp, Modifiers::NONE)]).unwrap(),
+        b"\x1b[A"
+    );
+    term.vt_write(b"\x1b[?1h");
+    assert_eq!(
+        input::encode(&term, &[key(Key::ArrowUp, Modifiers::NONE)]).unwrap(),
+        b"\x1bOA"
+    );
+    term.resize(12, 6, 9, 20).unwrap();
+    assert!(plain(&term).contains("hello red"));
+}
+
+#[test]
+fn queries_return_to_the_pty_and_alternate_screen_restores() {
+    let mut term = pane::terminal(&Config::default()).unwrap();
+    let response = Rc::new(RefCell::new(vec![]));
+    let writer = response.clone();
+    term.on_pty_write(move |_, bytes| writer.borrow_mut().extend_from_slice(bytes))
+        .unwrap();
+    term.vt_write(b"hello\x1b[6n");
+    assert_eq!(*response.borrow(), b"\x1b[1;6R");
+    term.vt_write(b"\x1b[?1049hother screen\x1b[?1049l");
+    assert!(plain(&term).contains("hello"));
+    assert!(!plain(&term).contains("other screen"));
+}
+
+#[test]
+fn kitty_images_decode_render_reuse_and_delete() {
+    graphics::set_png_decoder(Some(Box::new(render::PngDecoder))).unwrap();
+    let mut term = pane::terminal(&Config::default()).unwrap();
+    let replies = Rc::new(RefCell::new(vec![]));
+    let output = replies.clone();
+    term.on_pty_write(move |_, data| output.borrow_mut().extend_from_slice(data))
+        .unwrap();
+    // Split delivery across VT writes, including the control string terminator.
+    term.vt_write(b"\x1b_Ga=T,f=24,s=2,v=1,i=7,c=4,r=2;//8A");
+    term.vt_write(b"AP8A\x1b\\");
+    assert!(String::from_utf8_lossy(&replies.borrow()).contains("OK"));
+    {
+        let graphics = term.kitty_graphics().unwrap();
+        let image = graphics.image(7).expect("RGB image stored");
+        assert_eq!(image.format().unwrap(), ImageFormat::Rgb);
+        assert_eq!(image.data().unwrap(), [255, 255, 0, 0, 255, 0]);
+        let mut it = PlacementIterator::new().unwrap();
+        let mut ps = it.update(&graphics).unwrap();
+        let info = ps
+            .next()
+            .unwrap()
+            .placement_render_info(&image, &term)
+            .unwrap();
+        assert!(info.viewport_visible);
+        assert_eq!((info.pixel_width, info.pixel_height), (32, 32));
+    }
+    let mut png = vec![];
+    {
+        let mut encoder = png::Encoder::new(&mut png, 2, 1);
+        encoder.set_color(png::ColorType::Rgb);
+        encoder.set_depth(png::BitDepth::Eight);
+        encoder
+            .write_header()
+            .unwrap()
+            .write_image_data(&[255, 0, 0, 0, 255, 0])
+            .unwrap();
+    }
+    let payload = base64::engine::general_purpose::STANDARD.encode(png);
+    let split = payload.len() / 8 * 4;
+    term.vt_write(
+        format!(
+            "\x1b_Ga=T,f=100,i=8,c=2,r=1,m=1;{}\x1b\\",
+            &payload[..split]
+        )
+        .as_bytes(),
+    );
+    term.vt_write(format!("\x1b_Gm=0;{}\x1b\\", &payload[split..]).as_bytes());
+    {
+        let graphics = term.kitty_graphics().unwrap();
+        let image = graphics.image(8).expect("PNG image stored");
+        assert_eq!(image.format().unwrap(), ImageFormat::Rgba);
+        assert_eq!(image.data().unwrap(), [255, 0, 0, 255, 0, 255, 0, 255]);
+    }
+    let ctx = egui::Context::default();
+    let mut renderer = render::Renderer::new().unwrap();
+    let rect = egui::Rect::from_min_size(egui::pos2(50.0, 60.0), egui::vec2(400.0, 240.0));
+    let mut paint = || {
+        ctx.run(egui::RawInput::default(), |ctx| {
+            let painter = ctx
+                .layer_painter(egui::LayerId::background())
+                .with_clip_rect(rect);
+            renderer
+                .paint(
+                    &term,
+                    &painter,
+                    rect,
+                    egui::vec2(8.0, 16.0),
+                    &egui::FontId::monospace(12.0),
+                    true,
+                )
+                .unwrap();
+        })
+    };
+    let first = paint();
+    assert_eq!(
+        first
+            .textures_delta
+            .set
+            .iter()
+            .filter(|(id, _)| matches!(id,egui::TextureId::Managed(n) if *n>0))
+            .count(),
+        2
+    );
+    assert!(first.shapes.iter().all(|s| rect.contains_rect(s.clip_rect)));
+    let second = paint();
+    assert!(
+        second.textures_delta.set.is_empty(),
+        "unchanged images must reuse GPU textures"
+    );
+    term.vt_write(b"\x1b_Ga=d,d=I,i=7\x1b\\");
+    assert!(term.kitty_graphics().unwrap().image(7).is_none());
+    assert!(term.kitty_graphics().unwrap().image(8).is_some());
+}
+
+#[test]
+fn pty_executes_input_and_bracketed_paste_is_sanitized() {
+    let config = Config {
+        shell: vec!["/bin/sh".into()],
+        ..Default::default()
+    };
+    let ctx = egui::Context::default();
+    let mut pane = pane::Pane::new(&config, &ctx).unwrap();
+    pane.send(b"printf '\\033[31mpty-%s\\033[0m\\n' 'success'\r".to_vec())
+        .unwrap();
+    let deadline = Instant::now() + Duration::from_secs(5);
+    while Instant::now() < deadline {
+        pane.drain(&ctx);
+        if plain(&pane.terminal).contains("pty-success") {
+            break;
+        }
+        std::thread::sleep(Duration::from_millis(10));
+    }
+    assert!(plain(&pane.terminal).contains("pty-success"));
+    pane.pty.resize(91, 31, 9, 20).unwrap();
+    pane.send(b"stty size\r".to_vec()).unwrap();
+    let deadline = Instant::now() + Duration::from_secs(5);
+    while Instant::now() < deadline {
+        pane.drain(&ctx);
+        if plain(&pane.terminal).contains("31 91") {
+            break;
+        }
+        std::thread::sleep(Duration::from_millis(10));
+    }
+    assert!(plain(&pane.terminal).contains("31 91"));
+    pane.send(b"exit\r".to_vec()).unwrap();
+    let deadline = Instant::now() + Duration::from_secs(5);
+    while !pane.dead && Instant::now() < deadline {
+        pane.drain(&ctx);
+        std::thread::sleep(Duration::from_millis(10));
+    }
+    assert!(pane.dead);
+    assert!(pane.send(b"after exit".to_vec()).is_err());
+}