diff --git a/src/ui/mod.rs b/src/ui/mod.rs
index fa574ef..332f3dd 100644
--- a/src/ui/mod.rs
+++ b/src/ui/mod.rs
@@ -13,6 +13,7 @@
 
 pub mod component;
 pub mod keymap;
+pub mod popups;
 pub mod terminal;
 pub mod theme;
 pub mod widgets;
diff --git a/src/ui/popups/command_line.rs b/src/ui/popups/command_line.rs
new file mode 100644
index 0000000..9512be1
--- /dev/null
+++ b/src/ui/popups/command_line.rs
@@ -0,0 +1,237 @@
+//! The command line, opened with `:` like in vim. Handy for things that
+//! need a few words: `:pause 17:30`, `:export csv lastmonth`,
+//! `:set time_format=12h`.
+
+use jiff::Timestamp;
+use jiff::civil::Date;
+use ratatui::Frame;
+use ratatui::crossterm::event::KeyEvent;
+use ratatui::layout::Rect;
+use ratatui::style::Style;
+use ratatui::text::{Line, Span};
+use ratatui::widgets::{Clear, Paragraph};
+
+use super::export_dialog::named_ranges;
+use crate::action::Action;
+use crate::export::ExportFormat;
+use crate::export::timesheet::CopyPreset;
+use crate::settings::{Choice, FIELDS, Kind};
+use crate::time::DateRange;
+use crate::time::format::parse_time;
+use crate::time::resolve::latest_until;
+use crate::ui::keymap::{Binding, Command};
+use crate::ui::widgets::text_input::{InputEvent, TextInput};
+use crate::ui::{Component, Context, Tab};
+
+/// Every command, for the help screen.
+pub const COMMANDS: &[(&str, &str)] = &[
+    (":start [time]", "start now, or at an earlier time"),
+    (":pause [time]", "pause now, or at an earlier time"),
+    (":end [time]", "end the work day, now or at an earlier time"),
+    (":copy [format] [week]", "copy; formats: clock decimal segments inout custom"),
+    (":export [format] [dates]", "csv json md; week lastweek month lastmonth 30d year all"),
+    ("", "   dates can also be 2026-09 or 2026-09-01..2026-09-15"),
+    (":set name=value", "change a setting (name? shows it, name& resets it)"),
+    (":set name  :set noname", "turn an on/off setting on or off (name! flips it)"),
+    (":undo  :redo", "undo / redo"),
+    (":snooze", "snooze the break reminder"),
+    (":tracker :days :insights :settings", "go to a screen"),
+    (":help", "all keys"),
+    (":q", "quit"),
+];
+
+#[derive(Default)]
+pub struct CommandLine {
+    input: TextInput,
+    error: Option<String>,
+}
+
+impl CommandLine {
+    pub fn new() -> CommandLine {
+        CommandLine::default()
+    }
+}
+
+impl Component for CommandLine {
+    fn keys(&self) -> &'static [&'static [Binding]] {
+        &[]
+    }
+
+    /// Drawn over the status line at the bottom of the window.
+    fn render(&mut self, frame: &mut Frame, area: Rect, ctx: &Context) {
+        let bottom = Rect { y: area.bottom().saturating_sub(1), height: 1, ..area };
+        frame.render_widget(Clear, bottom);
+        let mut line = self.input.line(true, Style::new());
+        line.spans.insert(0, Span::styled(":", ctx.theme.title()));
+        frame.render_widget(Paragraph::new(line), bottom);
+
+        if let Some(error) = &self.error {
+            let above = Rect { y: bottom.y.saturating_sub(1), ..bottom };
+            frame.render_widget(Clear, above);
+            frame.render_widget(
+                Paragraph::new(Line::styled(error.clone(), Style::new().fg(ctx.theme.error))),
+                above,
+            );
+        }
+    }
+
+    fn command(&mut self, command: Command, _count: Option<usize>, _ctx: &Context) -> Option<Action> {
+        (command == Command::Close).then_some(Action::ClosePopup)
+    }
+
+    fn inserting(&self) -> bool {
+        true
+    }
+
+    fn insert_key(&mut self, key: KeyEvent, ctx: &Context) -> Option<Action> {
+        self.error = None;
+        match self.input.insert_key(key) {
+            InputEvent::Submit => match parse(self.input.text(), ctx) {
+                Ok(action) => Some(action),
+                Err(error) => {
+                    self.error = Some(error);
+                    None
+                }
+            },
+            InputEvent::Exit => Some(Action::ClosePopup),
+            _ => None,
+        }
+    }
+}
+
+/// Turns a command line into an action.
+pub fn parse(text: &str, ctx: &Context) -> Result<Action, String> {
+    let mut words = text.split_whitespace();
+    let Some(name) = words.next() else { return Ok(Action::ClosePopup) };
+    let rest: Vec<&str> = words.collect();
+
+    // An optional time after the command, as the latest moment it happened.
+    let moment = || -> Result<Option<Timestamp>, String> {
+        match rest.first() {
+            None => Ok(None),
+            Some(text) => {
+                let time = parse_time(text).map_err(|error| error.to_string())?;
+                Ok(Some(latest_until(time, ctx.now).timestamp()))
+            }
+        }
+    };
+
+    match name {
+        "q" | "q!" | "quit" | "wq" | "x" | "qa" => Ok(Action::Quit),
+        "w" => Ok(Action::Notify("skyshift saves every change right away".into())),
+        "start" => Ok(moment()?.map_or(Action::Start, Action::StartAt)),
+        "pause" => Ok(moment()?.map_or(Action::Pause, Action::PauseAt)),
+        "end" => Ok(moment()?.map_or(Action::EndDay, Action::EndDayAt)),
+        "undo" | "u" => Ok(Action::Undo),
+        "redo" => Ok(Action::Redo),
+        "snooze" => Ok(Action::Snooze),
+        "tracker" => Ok(Action::GoTo(Tab::Tracker)),
+        "days" => Ok(Action::GoTo(Tab::Days)),
+        "insights" => Ok(Action::GoTo(Tab::Insights)),
+        "settings" => Ok(Action::GoTo(Tab::Settings)),
+        "help" | "h" => Ok(Action::ShowHelp),
+        "copy" | "y" => copy(&rest, ctx),
+        "export" => export(&rest, ctx),
+        "set" | "se" => set(&rest.join(" "), ctx),
+        other => Err(format!("unknown command :{other} (:help lists them)")),
+    }
+}
+
+fn copy(words: &[&str], ctx: &Context) -> Result<Action, String> {
+    let mut preset = ctx.settings.copy_preset;
+    let mut week = false;
+    for word in words {
+        match *word {
+            "week" => week = true,
+            "day" => week = false,
+            "clock" | "hm" | "total" => preset = CopyPreset::TotalClock,
+            "decimal" => preset = CopyPreset::TotalDecimal,
+            "segments" => preset = CopyPreset::Segments,
+            "inout" => preset = CopyPreset::InOutBreak,
+            "custom" | "template" => preset = CopyPreset::Custom,
+            other => {
+                preset = CopyPreset::from_name(other).ok_or(format!("unknown copy format \"{other}\""))?
+            }
+        }
+    }
+    let day = ctx.current_day();
+    let days = if week { ctx.week_days(day) } else { vec![day] };
+    Ok(Action::Copy { days, preset })
+}
+
+fn export(words: &[&str], ctx: &Context) -> Result<Action, String> {
+    let mut format = ctx.settings.export_format;
+    let today = ctx.now.date();
+    let named = named_ranges(today, ctx.settings.week_start, ctx.days);
+    let mut range = named[0].2;
+    for word in words {
+        if let Some(found) = ExportFormat::from_name(word) {
+            format = found;
+        } else if *word == "md" {
+            format = ExportFormat::Markdown;
+        } else if let Some((_, _, found)) = named.iter().find(|(_, name, _)| name == word) {
+            range = *found;
+        } else {
+            range = parse_dates(word)?;
+        }
+    }
+    Ok(Action::Export { format, range })
+}
+
+/// "2026-09" (a month), "2026-09-24" (a day) or "2026-09-01..2026-09-15".
+fn parse_dates(text: &str) -> Result<DateRange, String> {
+    let error =
+        || format!("\"{text}\" isn't a format or dates (try week, month, 2026-09 or 2026-09-01..2026-09-15)");
+    let date = |text: &str| text.parse::<Date>().map_err(|_| error());
+    if let Some((first, last)) = text.split_once("..") {
+        return Ok(DateRange::new(date(first)?, date(last)?));
+    }
+    if text.len() == 7 {
+        return Ok(DateRange::month_of(date(&format!("{text}-01"))?));
+    }
+    let day = date(text)?;
+    Ok(DateRange::new(day, day))
+}
+
+/// `name=value`, `name value`, `name?` (show), `name&` (reset), and for
+/// on/off settings `name`, `noname` and `name!` (flip), like vim.
+fn set(text: &str, ctx: &Context) -> Result<Action, String> {
+    let text = text.trim();
+    if text.is_empty() {
+        return Err("usage: :set name=value (the names are in config.toml)".into());
+    }
+    let (name, value) = match text.split_once(['=', ' ']) {
+        Some((name, value)) => (name.trim(), Some(value.trim())),
+        None => (text, None),
+    };
+    let find = |name: &str| FIELDS.iter().find(|field| field.key == name);
+
+    if let Some(name) = name.strip_suffix('?') {
+        let field = find(name).ok_or(format!("no setting named {name}"))?;
+        return Ok(Action::Notify(format!("{} = {}", field.key, (field.get)(ctx.settings))));
+    }
+    if let Some(name) = name.strip_suffix('&') {
+        let field = find(name).ok_or(format!("no setting named {name}"))?;
+        return Ok(Action::ResetSetting { key: field.key });
+    }
+    if let Some(value) = value {
+        let field = find(name).ok_or(format!("no setting named {name}"))?;
+        return Ok(Action::SetSetting { key: field.key, value: value.to_string() });
+    }
+
+    // On/off settings: `mouse`, `nomouse`, `mouse!`.
+    let (name, value) = if let Some(name) = name.strip_suffix('!') {
+        let field = find(name).ok_or(format!("no setting named {name}"))?;
+        let on = (field.get)(ctx.settings) == "true";
+        (name, (!on).to_string())
+    } else if let Some(name) = name.strip_prefix("no").filter(|name| find(name).is_some()) {
+        (name, "false".to_string())
+    } else {
+        (name, "true".to_string())
+    };
+    let field = find(name).ok_or(format!("no setting named {name}"))?;
+    if !matches!(field.kind, Kind::Toggle) {
+        return Err(format!("{name} isn't an on/off setting: use :set {name}=value"));
+    }
+    Ok(Action::SetSetting { key: field.key, value })
+}
diff --git a/src/ui/popups/copy_menu.rs b/src/ui/popups/copy_menu.rs
new file mode 100644
index 0000000..4337d2d
--- /dev/null
+++ b/src/ui/popups/copy_menu.rs
@@ -0,0 +1,122 @@
+//! Choosing what to copy for your timesheet, with a preview of exactly what
+//! will be pasted.
+
+use jiff::civil::Date;
+use ratatui::Frame;
+use ratatui::layout::Rect;
+use ratatui::style::{Modifier, Style};
+use ratatui::text::{Line, Span};
+use ratatui::widgets::Paragraph;
+
+use super::window;
+use crate::action::Action;
+use crate::domain::WorkDay;
+use crate::export::timesheet::{CopyPreset, days_text};
+use crate::ui::keymap::{self, Binding, Command, CopyTarget};
+use crate::ui::{Component, Context};
+
+pub struct CopyMenu {
+    day: Date,
+    target: CopyTarget,
+    /// Index in `CopyPreset::ALL`.
+    selected: usize,
+}
+
+impl CopyMenu {
+    pub fn new(day: Date, ctx: &Context) -> CopyMenu {
+        let selected =
+            CopyPreset::ALL.iter().position(|preset| *preset == ctx.settings.copy_preset).unwrap_or(0);
+        CopyMenu { day, target: CopyTarget::Day, selected }
+    }
+
+    /// The days the copy covers: the day, or its whole week.
+    fn dates(&self, ctx: &Context) -> Vec<Date> {
+        match self.target {
+            CopyTarget::Day => vec![self.day],
+            CopyTarget::Week => ctx.week_days(self.day),
+        }
+    }
+
+    fn preview(&self, preset: CopyPreset, ctx: &Context) -> String {
+        let days: Vec<&WorkDay> = self.dates(ctx).into_iter().filter_map(|date| ctx.day(date)).collect();
+        if days.is_empty() {
+            return "(nothing recorded)".into();
+        }
+        // Show tabs and line breaks, which are otherwise invisible.
+        days_text(&days, preset, &ctx.copy_options()).replace('\t', " → ").replace('\n', " ⏎ ")
+    }
+}
+
+impl Component for CopyMenu {
+    fn keys(&self) -> &'static [&'static [Binding]] {
+        &[keymap::POPUP]
+    }
+
+    fn render(&mut self, frame: &mut Frame, area: Rect, ctx: &Context) {
+        let title = format!("Copy · {}", ctx.fmt.date_short(self.day));
+        let inner = window(
+            frame,
+            area,
+            76,
+            11,
+            &title,
+            "j/k choose · h/l day or week · Enter copy · Esc cancel",
+            ctx.theme,
+        );
+
+        let tab = |label: &'static str, active: bool| {
+            if active {
+                Span::styled(format!(" {label} "), ctx.theme.selected(true))
+            } else {
+                Span::raw(format!(" {label} "))
+            }
+        };
+        let mut lines = vec![
+            Line::from(vec![
+                Span::raw("  "),
+                tab("This day", self.target == CopyTarget::Day),
+                Span::raw(" "),
+                tab("Its week, a line per day", self.target == CopyTarget::Week),
+            ]),
+            Line::default(),
+        ];
+        let preview_width = usize::from(inner.width).saturating_sub(44);
+        for (index, preset) in CopyPreset::ALL.iter().enumerate() {
+            let selected = index == self.selected;
+            let marker = if selected { "▶ " } else { "  " };
+            let label_style = if selected { ctx.theme.title() } else { Style::new() };
+            let preview: String = self.preview(*preset, ctx).chars().take(preview_width).collect();
+            lines.push(Line::from(vec![
+                Span::styled(format!("  {marker}{:<40}", preset.label()), label_style),
+                Span::styled(
+                    preview,
+                    ctx.theme.muted().add_modifier(if selected { Modifier::BOLD } else { Modifier::empty() }),
+                ),
+            ]));
+        }
+        frame.render_widget(Paragraph::new(lines), inner);
+    }
+
+    fn command(&mut self, command: Command, count: Option<usize>, ctx: &Context) -> Option<Action> {
+        let last = CopyPreset::ALL.len() - 1;
+        let steps = count.unwrap_or(1);
+        match command {
+            Command::Down => self.selected = (self.selected + steps).min(last),
+            Command::Up => self.selected = self.selected.saturating_sub(steps),
+            Command::Top => self.selected = 0,
+            Command::Bottom => self.selected = last,
+            Command::Left | Command::Right => {
+                self.target = match self.target {
+                    CopyTarget::Day => CopyTarget::Week,
+                    CopyTarget::Week => CopyTarget::Day,
+                }
+            }
+            Command::Confirm => {
+                return Some(Action::Copy { days: self.dates(ctx), preset: CopyPreset::ALL[self.selected] });
+            }
+            Command::Close => return Some(Action::ClosePopup),
+            _ => {}
+        }
+        None
+    }
+}
diff --git a/src/ui/popups/export_dialog.rs b/src/ui/popups/export_dialog.rs
new file mode 100644
index 0000000..f53fc90
--- /dev/null
+++ b/src/ui/popups/export_dialog.rs
@@ -0,0 +1,118 @@
+//! Exporting a report file: pick a format and a range of dates.
+
+use jiff::ToSpan;
+use jiff::civil::{Date, Weekday};
+use ratatui::Frame;
+use ratatui::layout::Rect;
+use ratatui::style::Style;
+use ratatui::text::{Line, Span};
+use ratatui::widgets::Paragraph;
+
+use super::window;
+use crate::action::Action;
+use crate::domain::WorkDay;
+use crate::export::ExportFormat;
+use crate::time::DateRange;
+use crate::ui::keymap::{self, Binding, Command};
+use crate::ui::{Component, Context};
+
+/// The ranges offered for exports, with a name for the `:export` command.
+pub fn named_ranges(
+    today: Date,
+    week_start: Weekday,
+    days: &[WorkDay],
+) -> Vec<(&'static str, &'static str, DateRange)> {
+    let this_week = DateRange::week_of(today, week_start);
+    let this_month = DateRange::month_of(today);
+    let first_day = days.first().map_or(today, WorkDay::date);
+    vec![
+        ("This week", "week", this_week),
+        ("Last week", "lastweek", this_week.previous()),
+        ("This month", "month", this_month),
+        ("Last month", "lastmonth", DateRange::month_of(this_month.first().saturating_sub(1.day()))),
+        ("Last 30 days", "30d", DateRange::last_days(today, 30)),
+        ("This year", "year", DateRange::new(today.first_of_year(), today)),
+        ("All time", "all", DateRange::new(first_day, today)),
+    ]
+}
+
+pub struct ExportDialog {
+    format: ExportFormat,
+    /// Index in `named_ranges`.
+    selected: usize,
+}
+
+impl ExportDialog {
+    pub fn new(ctx: &Context) -> ExportDialog {
+        ExportDialog { format: ctx.settings.export_format, selected: 0 }
+    }
+
+    fn cycle_format(&mut self, forward: bool) {
+        let all = ExportFormat::ALL;
+        let index = all.iter().position(|format| *format == self.format).unwrap_or(0);
+        let next = if forward { (index + 1) % all.len() } else { (index + all.len() - 1) % all.len() };
+        self.format = all[next];
+    }
+}
+
+impl Component for ExportDialog {
+    fn keys(&self) -> &'static [&'static [Binding]] {
+        &[keymap::POPUP]
+    }
+
+    fn render(&mut self, frame: &mut Frame, area: Rect, ctx: &Context) {
+        let inner = window(
+            frame,
+            area,
+            64,
+            15,
+            "Export a report",
+            "h/l format · j/k dates · Enter export · Esc cancel",
+            ctx.theme,
+        );
+        let mut lines = vec![
+            Line::default(),
+            Line::from(vec![
+                Span::raw("  Format   "),
+                Span::styled(format!("◀ {} ▶", self.format.label()), ctx.theme.title()),
+            ]),
+            Line::default(),
+        ];
+        for (index, (label, _, range)) in
+            named_ranges(ctx.now.date(), ctx.settings.week_start, ctx.days).iter().enumerate()
+        {
+            let selected = index == self.selected;
+            let marker = if selected { "▶ " } else { "  " };
+            let style = if selected { ctx.theme.title() } else { Style::new() };
+            let dates =
+                format!("{} - {}", ctx.fmt.date_short(range.first()), ctx.fmt.date_short(range.last()));
+            lines.push(Line::from(vec![
+                Span::styled(format!("  {marker}{label:<14}"), style),
+                Span::styled(dates, ctx.theme.muted()),
+            ]));
+        }
+        lines.push(Line::default());
+        lines.push(Line::styled(format!("  Saved in {}", ctx.export_folder.display()), ctx.theme.muted()));
+        frame.render_widget(Paragraph::new(lines), inner);
+    }
+
+    fn command(&mut self, command: Command, count: Option<usize>, ctx: &Context) -> Option<Action> {
+        let ranges = named_ranges(ctx.now.date(), ctx.settings.week_start, ctx.days);
+        let last = ranges.len() - 1;
+        let steps = count.unwrap_or(1);
+        match command {
+            Command::Down => self.selected = (self.selected + steps).min(last),
+            Command::Up => self.selected = self.selected.saturating_sub(steps),
+            Command::Top => self.selected = 0,
+            Command::Bottom => self.selected = last,
+            Command::Left => self.cycle_format(false),
+            Command::Right => self.cycle_format(true),
+            Command::Confirm => {
+                return Some(Action::Export { format: self.format, range: ranges[self.selected].2 });
+            }
+            Command::Close => return Some(Action::ClosePopup),
+            _ => {}
+        }
+        None
+    }
+}
diff --git a/src/ui/popups/help.rs b/src/ui/popups/help.rs
new file mode 100644
index 0000000..af50608
--- /dev/null
+++ b/src/ui/popups/help.rs
@@ -0,0 +1,114 @@
+//! Every key, generated from the key tables (so it's never out of date).
+
+use ratatui::Frame;
+use ratatui::layout::Rect;
+use ratatui::style::Style;
+use ratatui::text::{Line, Span};
+use ratatui::widgets::Paragraph;
+
+use super::command_line::COMMANDS;
+use super::window;
+use crate::action::Action;
+use crate::ui::keymap::{self, Binding, Command};
+use crate::ui::{Component, Context};
+
+const TYPING: &[(&str, &str)] = &[
+    ("<CR>", "confirm"),
+    ("<Esc>", "back to normal mode (Esc again closes)"),
+    ("<Tab> <S-Tab>", "next / previous field"),
+    ("<C-w>", "delete the word before the cursor"),
+    ("<C-u>", "delete everything before the cursor"),
+    ("<Left> <Right> <Home> <End>", "move the cursor"),
+];
+
+pub struct Help {
+    sections: Vec<(String, Vec<(String, String)>)>,
+    scroll: usize,
+    /// Lines that fit on screen (known after drawing), for paging.
+    visible: usize,
+}
+
+impl Help {
+    /// Help for a screen: its own keys first, then everything else.
+    pub fn new(screen: &str, screen_tables: &[&[Binding]]) -> Help {
+        let pairs = |rows: &[(&str, &str)]| {
+            rows.iter().map(|(keys, help)| (keys.to_string(), help.to_string())).collect()
+        };
+        Help {
+            sections: vec![
+                (format!("{screen} screen"), merged(screen_tables)),
+                ("Everywhere".into(), merged(&[keymap::GLOBAL])),
+                ("In popups (normal mode)".into(), merged(&[keymap::POPUP])),
+                ("Typing (insert mode)".into(), pairs(TYPING)),
+                ("Command line".into(), pairs(COMMANDS)),
+            ],
+            scroll: 0,
+            visible: 10,
+        }
+    }
+
+    fn lines(&self, ctx: &Context) -> Vec<Line<'static>> {
+        let mut lines = Vec::new();
+        for (title, rows) in &self.sections {
+            if rows.is_empty() {
+                continue;
+            }
+            lines.push(Line::styled(format!(" {title}"), ctx.theme.title()));
+            for (keys, help) in rows {
+                lines.push(Line::from(vec![
+                    Span::styled(format!("   {keys:<28}"), ctx.theme.accent()),
+                    Span::styled(help.clone(), Style::new()),
+                ]));
+            }
+            lines.push(Line::default());
+        }
+        lines
+    }
+}
+
+/// The bindings of some tables as (keys, help). Keys that do the same
+/// thing are merged on one line: "j <Down>".
+fn merged(tables: &[&[Binding]]) -> Vec<(String, String)> {
+    let mut rows: Vec<(String, String)> = Vec::new();
+    for binding in tables.iter().flat_map(|table| table.iter()) {
+        match rows.iter_mut().find(|(_, help)| help == binding.help) {
+            Some((keys, _)) => {
+                keys.push(' ');
+                keys.push_str(binding.keys);
+            }
+            None => rows.push((binding.keys.to_string(), binding.help.to_string())),
+        }
+    }
+    rows
+}
+
+impl Component for Help {
+    fn keys(&self) -> &'static [&'static [Binding]] {
+        &[keymap::POPUP]
+    }
+
+    fn render(&mut self, frame: &mut Frame, area: Rect, ctx: &Context) {
+        let width = area.width.saturating_sub(8).min(100);
+        let height = area.height.saturating_sub(4);
+        let inner = window(frame, area, width, height, "Keys", "j/k scroll · q close", ctx.theme);
+        let lines = self.lines(ctx);
+        self.visible = usize::from(inner.height).max(1);
+        self.scroll = self.scroll.min(lines.len().saturating_sub(self.visible));
+        frame.render_widget(Paragraph::new(lines).scroll((self.scroll as u16, 0)), inner);
+    }
+
+    fn command(&mut self, command: Command, count: Option<usize>, _ctx: &Context) -> Option<Action> {
+        let steps = count.unwrap_or(1);
+        match command {
+            Command::Down => self.scroll += steps,
+            Command::Up => self.scroll = self.scroll.saturating_sub(steps),
+            Command::HalfPageDown => self.scroll += self.visible / 2,
+            Command::HalfPageUp => self.scroll = self.scroll.saturating_sub(self.visible / 2),
+            Command::Top => self.scroll = 0,
+            Command::Bottom => self.scroll = usize::MAX / 2,
+            Command::Close | Command::Confirm => return Some(Action::ClosePopup),
+            _ => {}
+        }
+        None
+    }
+}
diff --git a/src/ui/popups/mod.rs b/src/ui/popups/mod.rs
new file mode 100644
index 0000000..111d674
--- /dev/null
+++ b/src/ui/popups/mod.rs
@@ -0,0 +1,77 @@
+//! Popups: small windows over the screen, each for one focused task.
+//!
+//! Every popup is a [`Component`](super::Component). An action a popup
+//! returns closes it when the app applies it successfully; when it fails
+//! (say, the times overlap another segment), the popup stays open.
+
+pub mod command_line;
+pub mod copy_menu;
+pub mod export_dialog;
+pub mod help;
+pub mod segment_editor;
+pub mod still_working;
+pub mod time_prompt;
+
+use ratatui::Frame;
+use ratatui::layout::Rect;
+use ratatui::style::{Modifier, Style};
+use ratatui::text::{Line, Span};
+use ratatui::widgets::{Block, BorderType, Clear};
+
+use super::theme::Theme;
+use super::widgets::centered;
+use super::widgets::text_input::TextInput;
+
+/// Draws an empty popup window of `width` × `height` in the middle of
+/// `area`, with a title and a hint at the bottom. Returns the space inside.
+pub fn window(
+    frame: &mut Frame,
+    area: Rect,
+    width: u16,
+    height: u16,
+    title: &str,
+    hint: &str,
+    theme: &Theme,
+) -> Rect {
+    let rect = centered(area, width, height);
+    frame.render_widget(Clear, rect);
+    let block = Block::bordered()
+        .border_type(BorderType::Rounded)
+        .border_style(theme.accent())
+        .title(Line::styled(format!(" {title} "), theme.title()))
+        .title_bottom(Line::styled(format!(" {hint} "), theme.muted()).right_aligned());
+    let inner = block.inner(rect);
+    frame.render_widget(block, rect);
+    inner
+}
+
+/// One line of a form: `  Start      22:00        Thu Sep 24 22:00`.
+/// The focused field is highlighted; in insert mode it shows the cursor.
+pub fn field_line(
+    label: &str,
+    input: &TextInput,
+    focused: bool,
+    inserting: bool,
+    note: Span<'static>,
+    theme: &Theme,
+) -> Line<'static> {
+    const INPUT_WIDTH: usize = 14;
+    let label_style = if focused { theme.title() } else { Style::new() };
+    let input_style = if focused { Style::new().add_modifier(Modifier::UNDERLINED) } else { theme.muted() };
+    let mut spans = vec![Span::styled(format!("  {label:<10}"), label_style)];
+    let mut text = input.line(focused && inserting, input_style).spans;
+    let used: usize = text.iter().map(|span| span.content.chars().count()).sum();
+    text.push(Span::styled(" ".repeat(INPUT_WIDTH.saturating_sub(used)), input_style));
+    spans.extend(text);
+    spans.push(Span::raw("  "));
+    spans.push(note);
+    Line::from(spans)
+}
+
+/// The line under a form: the error if there is one, a tip otherwise.
+pub fn message_line(error: Option<&str>, tip: &str, theme: &Theme) -> Line<'static> {
+    match error {
+        Some(error) => Line::styled(format!("  {error}"), Style::new().fg(theme.error)),
+        None => Line::styled(format!("  {tip}"), theme.muted()),
+    }
+}
diff --git a/src/ui/popups/segment_editor.rs b/src/ui/popups/segment_editor.rs
new file mode 100644
index 0000000..ded48d3
--- /dev/null
+++ b/src/ui/popups/segment_editor.rs
@@ -0,0 +1,277 @@
+//! Adding or fixing a segment by typing its times.
+//!
+//! You type clock times ("22:00", "1:30am"); the editor shows right away
+//! which exact moments they mean (see `time::resolve`), so a night shift
+//! "22:00 to 01:30" visibly ends the next day.
+
+use jiff::civil::Date;
+use jiff::{Timestamp, Zoned};
+use ratatui::Frame;
+use ratatui::crossterm::event::KeyEvent;
+use ratatui::layout::Rect;
+use ratatui::style::{Modifier, Style};
+use ratatui::text::{Line, Span};
+use ratatui::widgets::Paragraph;
+
+use super::{field_line, message_line, window};
+use crate::action::Action;
+use crate::domain::{Segment, WorkDay};
+use crate::time::format::parse_time;
+use crate::time::resolve::{nearest, next_after};
+use crate::ui::keymap::{self, Binding, Command};
+use crate::ui::widgets::text_input::{InputEvent, TextInput};
+use crate::ui::{Component, Context};
+
+/// What is being edited.
+#[derive(Debug, Clone, Copy, PartialEq, Eq)]
+pub enum Target {
+    /// A new segment for the work day `day`, placed after (or before) its
+    /// existing segments.
+    New { day: Date, after: bool },
+    /// Segment number `index` of the work day `day`.
+    Existing { day: Date, index: usize, original: Segment },
+    /// The session in progress. Leaving the end empty keeps it running.
+    Running { day: Date, since: Timestamp },
+}
+
+pub struct SegmentEditor {
+    target: Target,
+    start: TextInput,
+    end: TextInput,
+    day: TextInput,
+    /// The field with the focus: 0 = start, 1 = end, 2 = work day.
+    field: usize,
+    inserting: bool,
+    error: Option<String>,
+}
+
+/// The typed fields, turned into exact moments.
+struct Resolved {
+    start: Zoned,
+    end: Option<Zoned>,
+    day: Date,
+}
+
+impl SegmentEditor {
+    pub fn new(target: Target, ctx: &Context) -> SegmentEditor {
+        let (start, end, day) = match target {
+            Target::New { day, .. } => (String::new(), String::new(), day),
+            Target::Existing { day, original, .. } => {
+                (ctx.time(original.start()), ctx.time(original.end()), day)
+            }
+            Target::Running { day, since } => (ctx.time(since), String::new(), day),
+        };
+        SegmentEditor {
+            target,
+            start: TextInput::new(start),
+            end: TextInput::new(end),
+            day: TextInput::new(day.to_string()),
+            field: 0,
+            inserting: true,
+            error: None,
+        }
+    }
+
+    fn is_running(&self) -> bool {
+        matches!(self.target, Target::Running { .. })
+    }
+
+    fn field_count(&self) -> usize {
+        if self.is_running() { 2 } else { 3 }
+    }
+
+    fn input(&mut self) -> &mut TextInput {
+        match self.field {
+            0 => &mut self.start,
+            1 => &mut self.end,
+            _ => &mut self.day,
+        }
+    }
+
+    /// Where typed start times are placed: close to this moment.
+    fn reference(&self, ctx: &Context) -> Zoned {
+        let day_edge = |day: Date, after: bool| {
+            let work_day = ctx.day(day);
+            let edge = if after {
+                work_day.and_then(WorkDay::last_end)
+            } else {
+                work_day.and_then(WorkDay::first_start)
+            };
+            edge.map_or_else(|| ctx.noon(day), |moment| ctx.local(moment))
+        };
+        match self.target {
+            Target::New { day, after } => day_edge(day, after),
+            Target::Existing { original, .. } => ctx.local(original.start()),
+            Target::Running { since, .. } => ctx.local(since),
+        }
+    }
+
+    fn resolve(&self, ctx: &Context) -> Result<Resolved, String> {
+        let start_time = parse_time(self.start.text()).map_err(|error| format!("start: {error}"))?;
+        let start = nearest(start_time, &self.reference(ctx));
+        let end = match self.end.text().trim() {
+            "" if self.is_running() => None,
+            "" => return Err("end: when did it end?".into()),
+            text => {
+                let end_time = parse_time(text).map_err(|error| format!("end: {error}"))?;
+                Some(next_after(end_time, &start))
+            }
+        };
+        let day = match self.target {
+            Target::Running { day, .. } => day,
+            _ => self
+                .day
+                .text()
+                .trim()
+                .parse()
+                .map_err(|_| "work day: write it like 2026-09-24".to_string())?,
+        };
+        Ok(Resolved { start, end, day })
+    }
+
+    fn submit(&mut self, ctx: &Context) -> Option<Action> {
+        let result = self.resolve(ctx).and_then(|resolved| self.action(resolved));
+        match result {
+            Ok(action) => Some(action),
+            Err(error) => {
+                self.error = Some(error);
+                None
+            }
+        }
+    }
+
+    fn action(&self, resolved: Resolved) -> Result<Action, String> {
+        let start = resolved.start.timestamp();
+        let end = resolved.end.map(|end| end.timestamp());
+        if let Target::Running { .. } = self.target {
+            return Ok(Action::FixRunning { since: start, stopped: end });
+        }
+        let segment =
+            Segment::new(start, end.ok_or("end: when did it end?")?).map_err(|error| error.to_string())?;
+        Ok(match self.target {
+            Target::Existing { day, index, .. } => {
+                Action::ReplaceSegment { day, index, segment, new_day: resolved.day }
+            }
+            _ => Action::AddSegment { day: resolved.day, segment },
+        })
+    }
+
+    fn title(&self, ctx: &Context) -> String {
+        match self.target {
+            Target::New { day, .. } => format!("Add work · {}", ctx.fmt.date_short(day)),
+            Target::Existing { day, index, .. } => {
+                format!("Segment {} · {}", index + 1, ctx.fmt.date_short(day))
+            }
+            Target::Running { .. } => "The session in progress".to_string(),
+        }
+    }
+
+    /// The exact moment a field means, next to it.
+    fn note(moment: Option<&Zoned>, empty_note: &str, ctx: &Context) -> Span<'static> {
+        match moment {
+            Some(moment) => Span::styled(
+                format!("{} {}", ctx.fmt.date_short(moment.date()), ctx.fmt.time(moment.time())),
+                ctx.theme.accent(),
+            ),
+            None => Span::styled(empty_note.to_string(), ctx.theme.muted()),
+        }
+    }
+}
+
+impl Component for SegmentEditor {
+    fn keys(&self) -> &'static [&'static [Binding]] {
+        &[keymap::POPUP]
+    }
+
+    fn render(&mut self, frame: &mut Frame, area: Rect, ctx: &Context) {
+        let title = self.title(ctx);
+        let inner =
+            window(frame, area, 76, 11, &title, "Enter save · Tab next field · Esc cancel", ctx.theme);
+        let resolved = self.resolve(ctx);
+        let (start, end) = match &resolved {
+            Ok(resolved) => (Some(&resolved.start), resolved.end.as_ref()),
+            Err(_) => (None, None),
+        };
+        let end_note = if self.is_running() { "empty = still working" } else { "" };
+
+        let mut lines = vec![
+            Line::default(),
+            field_line(
+                "Start",
+                &self.start,
+                self.field == 0,
+                self.inserting,
+                Self::note(start, "", ctx),
+                ctx.theme,
+            ),
+            field_line(
+                "End",
+                &self.end,
+                self.field == 1,
+                self.inserting,
+                Self::note(end, end_note, ctx),
+                ctx.theme,
+            ),
+        ];
+        if !self.is_running() {
+            let note = Span::styled("the day it counts for", ctx.theme.muted());
+            lines.push(field_line("Work day", &self.day, self.field == 2, self.inserting, note, ctx.theme));
+        }
+        lines.push(Line::default());
+        let length = match (start, end) {
+            (Some(start), Some(end)) => ctx.fmt.duration(end.duration_since(start)),
+            (Some(start), None) if self.is_running() => {
+                ctx.fmt.duration(ctx.now.duration_since(start)) + " so far"
+            }
+            _ => String::new(),
+        };
+        lines.push(Line::from(vec![
+            Span::raw("  Length    "),
+            Span::styled(length, Style::new().add_modifier(Modifier::BOLD)),
+        ]));
+        let tip = "22:30, 2230 or 10:30pm all work. An end before the start is the next day.";
+        lines.push(message_line(self.error.as_deref(), tip, ctx.theme));
+        frame.render_widget(Paragraph::new(lines), inner);
+    }
+
+    fn command(&mut self, command: Command, _count: Option<usize>, ctx: &Context) -> Option<Action> {
+        match command {
+            Command::Confirm => return self.submit(ctx),
+            Command::Close => return Some(Action::ClosePopup),
+            Command::Down => self.field = (self.field + 1) % self.field_count(),
+            Command::Up => self.field = (self.field + self.field_count() - 1) % self.field_count(),
+            Command::Top => self.field = 0,
+            Command::Bottom => self.field = self.field_count() - 1,
+            Command::Insert => {
+                self.input().cursor_to_end();
+                self.inserting = true;
+            }
+            Command::InsertAtStart => {
+                self.input().cursor_to_start();
+                self.inserting = true;
+            }
+            Command::Retype => {
+                self.input().clear();
+                self.inserting = true;
+            }
+            _ => {}
+        }
+        None
+    }
+
+    fn inserting(&self) -> bool {
+        self.inserting
+    }
+
+    fn insert_key(&mut self, key: KeyEvent, ctx: &Context) -> Option<Action> {
+        self.error = None;
+        match self.input().insert_key(key) {
+            InputEvent::Submit => return self.submit(ctx),
+            InputEvent::Exit => self.inserting = false,
+            InputEvent::Next => self.field = (self.field + 1) % self.field_count(),
+            InputEvent::Previous => self.field = (self.field + self.field_count() - 1) % self.field_count(),
+            InputEvent::Edited => {}
+        }
+        None
+    }
+}
diff --git a/src/ui/popups/still_working.rs b/src/ui/popups/still_working.rs
new file mode 100644
index 0000000..6a3b16f
--- /dev/null
+++ b/src/ui/popups/still_working.rs
@@ -0,0 +1,126 @@
+//! "Still working?": asked when a session has been running for a very long
+//! time, in case you forgot to pause.
+
+use jiff::{Timestamp, Zoned};
+use ratatui::Frame;
+use ratatui::crossterm::event::KeyEvent;
+use ratatui::layout::Rect;
+use ratatui::style::Style;
+use ratatui::text::{Line, Span};
+use ratatui::widgets::Paragraph;
+
+use super::{field_line, message_line, window};
+use crate::action::Action;
+use crate::time::format::parse_time;
+use crate::time::resolve::next_after;
+use crate::ui::keymap::{self, Binding, Command};
+use crate::ui::widgets::text_input::{InputEvent, TextInput};
+use crate::ui::{Component, Context};
+
+pub struct StillWorking {
+    since: Timestamp,
+    input: TextInput,
+    inserting: bool,
+    error: Option<String>,
+}
+
+impl StillWorking {
+    pub fn new(since: Timestamp) -> StillWorking {
+        StillWorking { since, input: TextInput::default(), inserting: true, error: None }
+    }
+
+    /// When you stopped: the first time after the start the clock showed
+    /// the typed time.
+    fn stopped(&self, ctx: &Context) -> Result<Zoned, String> {
+        let time = parse_time(self.input.text()).map_err(|error| error.to_string())?;
+        let stopped = next_after(time, &ctx.local(self.since));
+        if stopped.timestamp() > ctx.now.timestamp() {
+            return Err("that's later than now".into());
+        }
+        Ok(stopped)
+    }
+
+    fn submit(&mut self, ctx: &Context) -> Option<Action> {
+        match self.stopped(ctx) {
+            Ok(stopped) => Some(Action::PauseAt(stopped.timestamp())),
+            Err(error) => {
+                self.error = Some(error);
+                None
+            }
+        }
+    }
+}
+
+impl Component for StillWorking {
+    fn keys(&self) -> &'static [&'static [Binding]] {
+        &[keymap::POPUP]
+    }
+
+    fn render(&mut self, frame: &mut Frame, area: Rect, ctx: &Context) {
+        let inner = window(
+            frame,
+            area,
+            68,
+            10,
+            "Still working?",
+            "Enter record the pause · Esc I'm still working",
+            ctx.theme,
+        );
+        let started = ctx.local(self.since);
+        let running = ctx.now.duration_since(&started);
+        let note = if self.input.text().trim().is_empty() {
+            Span::styled("like 18:00", ctx.theme.muted())
+        } else {
+            match self.stopped(ctx) {
+                Ok(stopped) => Span::styled(
+                    format!("{} {}", ctx.fmt.date_short(stopped.date()), ctx.fmt.time(stopped.time())),
+                    ctx.theme.accent(),
+                ),
+                Err(error) => Span::styled(error, Style::new().fg(ctx.theme.error)),
+            }
+        };
+        let lines = vec![
+            Line::default(),
+            Line::from(format!(
+                "  This session started {} at {}: {} ago.",
+                ctx.fmt.date_short(started.date()),
+                ctx.fmt.time(started.time()),
+                ctx.fmt.duration(running)
+            )),
+            Line::from("  If you forgot to pause, when did you stop?"),
+            Line::default(),
+            field_line("Stopped at", &self.input, true, self.inserting, note, ctx.theme),
+            Line::default(),
+            message_line(self.error.as_deref(), "No worries: nothing is lost either way.", ctx.theme),
+        ];
+        frame.render_widget(Paragraph::new(lines), inner);
+    }
+
+    fn command(&mut self, command: Command, _count: Option<usize>, ctx: &Context) -> Option<Action> {
+        match command {
+            Command::Confirm => self.submit(ctx),
+            Command::Close => Some(Action::ClosePopup),
+            Command::Insert | Command::InsertAtStart | Command::Retype => {
+                self.inserting = true;
+                None
+            }
+            _ => None,
+        }
+    }
+
+    fn inserting(&self) -> bool {
+        self.inserting
+    }
+
+    fn insert_key(&mut self, key: KeyEvent, ctx: &Context) -> Option<Action> {
+        self.error = None;
+        match self.input.insert_key(key) {
+            InputEvent::Submit => self.submit(ctx),
+            InputEvent::Exit => {
+                self.inserting = false;
+                None
+            }
+            _ => None,
+        }
+    }
+}
diff --git a/src/ui/popups/time_prompt.rs b/src/ui/popups/time_prompt.rs
new file mode 100644
index 0000000..088e832
--- /dev/null
+++ b/src/ui/popups/time_prompt.rs
@@ -0,0 +1,159 @@
+//! Asks for one time, for when you forgot to press a button:
+//! "Start at...", "Pause at...", "End the day at...".
+
+use jiff::{Timestamp, Zoned};
+use ratatui::Frame;
+use ratatui::crossterm::event::KeyEvent;
+use ratatui::layout::Rect;
+use ratatui::style::Style;
+use ratatui::text::{Line, Span};
+use ratatui::widgets::Paragraph;
+
+use super::{field_line, message_line, window};
+use crate::action::Action;
+use crate::domain::ShiftState;
+use crate::time::format::parse_time;
+use crate::time::resolve::latest_until;
+use crate::ui::keymap::{self, Binding, Command};
+use crate::ui::widgets::text_input::{InputEvent, TextInput};
+use crate::ui::{Component, Context};
+
+/// What the typed time is for.
+#[derive(Debug, Clone, Copy, PartialEq, Eq)]
+pub enum Purpose {
+    Start,
+    Pause,
+    EndDay,
+}
+
+impl Purpose {
+    fn title(self) -> &'static str {
+        match self {
+            Purpose::Start => "You started at...",
+            Purpose::Pause => "You paused at...",
+            Purpose::EndDay => "You ended the day at...",
+        }
+    }
+
+    fn action(self, moment: Timestamp) -> Action {
+        match self {
+            Purpose::Start => Action::StartAt(moment),
+            Purpose::Pause => Action::PauseAt(moment),
+            Purpose::EndDay => Action::EndDayAt(moment),
+        }
+    }
+}
+
+pub struct TimePrompt {
+    purpose: Purpose,
+    input: TextInput,
+    inserting: bool,
+    error: Option<String>,
+}
+
+impl TimePrompt {
+    pub fn new(purpose: Purpose) -> TimePrompt {
+        TimePrompt { purpose, input: TextInput::default(), inserting: true, error: None }
+    }
+
+    /// The moment typed so far: the latest time the clock showed it.
+    fn moment(&self, ctx: &Context) -> Result<Zoned, String> {
+        let time = parse_time(self.input.text()).map_err(|error| error.to_string())?;
+        Ok(latest_until(time, ctx.now))
+    }
+
+    fn submit(&mut self, ctx: &Context) -> Option<Action> {
+        match self.moment(ctx) {
+            Ok(moment) => Some(self.purpose.action(moment.timestamp())),
+            Err(error) => {
+                self.error = Some(error);
+                None
+            }
+        }
+    }
+
+    /// What the typed time means: "Thu Sep 24 17:30 · 35m ago".
+    fn preview(&self, ctx: &Context) -> Span<'static> {
+        if self.input.text().trim().is_empty() {
+            return Span::styled("like 17:30 or 5:30pm", ctx.theme.muted());
+        }
+        match self.moment(ctx) {
+            Ok(moment) => {
+                let ago = ctx.fmt.duration(ctx.now.duration_since(&moment));
+                let mut text = format!(
+                    "{} {} · {ago} ago",
+                    ctx.fmt.date_short(moment.date()),
+                    ctx.fmt.time(moment.time())
+                );
+                if let (Purpose::Pause | Purpose::EndDay, ShiftState::Working { since, .. }) =
+                    (self.purpose, ctx.journal.state())
+                {
+                    let session = moment.timestamp().duration_since(since);
+                    text = format!("{text} · session {}", ctx.fmt.duration(session));
+                }
+                Span::styled(text, ctx.theme.accent())
+            }
+            Err(error) => Span::styled(error, Style::new().fg(ctx.theme.error)),
+        }
+    }
+}
+
+impl Component for TimePrompt {
+    fn keys(&self) -> &'static [&'static [Binding]] {
+        &[keymap::POPUP]
+    }
+
+    fn render(&mut self, frame: &mut Frame, area: Rect, ctx: &Context) {
+        let inner = window(frame, area, 64, 7, self.purpose.title(), "Enter ok · Esc cancel", ctx.theme);
+        let lines = vec![
+            Line::default(),
+            field_line("Time", &self.input, true, self.inserting, self.preview(ctx), ctx.theme),
+            Line::default(),
+            message_line(
+                self.error.as_deref(),
+                "Times like 22:30, 2230, 22h30 and 10:30pm all work.",
+                ctx.theme,
+            ),
+        ];
+        frame.render_widget(Paragraph::new(lines), inner);
+    }
+
+    fn command(&mut self, command: Command, _count: Option<usize>, ctx: &Context) -> Option<Action> {
+        match command {
+            Command::Confirm => self.submit(ctx),
+            Command::Close => Some(Action::ClosePopup),
+            Command::Insert => {
+                self.input.cursor_to_end();
+                self.inserting = true;
+                None
+            }
+            Command::InsertAtStart => {
+                self.input.cursor_to_start();
+                self.inserting = true;
+                None
+            }
+            Command::Retype => {
+                self.input.clear();
+                self.inserting = true;
+                None
+            }
+            _ => None,
+        }
+    }
+
+    fn inserting(&self) -> bool {
+        self.inserting
+    }
+
+    fn insert_key(&mut self, key: KeyEvent, ctx: &Context) -> Option<Action> {
+        self.error = None;
+        match self.input.insert_key(key) {
+            InputEvent::Submit => self.submit(ctx),
+            InputEvent::Exit => {
+                self.inserting = false;
+                None
+            }
+            _ => None,
+        }
+    }
+}