First

src/main.rs

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+use std::{io, time::{Duration, Instant}};
+use crossterm::event::{self, Event, KeyCode, KeyEventKind};
+use ratatui::{DefaultTerminal, Frame};
+use ratatui::layout::{Constraint, Layout, Spacing};
+use ratatui::symbols::merge::MergeStrategy;
+use ratatui::widgets::Block;
+
+#[derive(Default)]
+struct App {
+    should_exit: bool,
+    // navigation state goes here (selected index, velocity, etc.)
+}
+
+fn main() -> io::Result<()> {
+    let tick_rate = Duration::from_millis(16); // ~60Hz
+    let mut last_tick = Instant::now();
+
+    ratatui::run(|terminal: &mut DefaultTerminal| {
+        let mut app = App::default();
+
+        while !app.should_exit {
+            terminal.draw(|f| render(f))?;
+
+            // Non-blocking input with timeout until next tick
+            let timeout = tick_rate.saturating_sub(last_tick.elapsed());
+            if event::poll(timeout)? {
+                if let Event::Key(key) = event::read()? {
+                    if key.kind == KeyEventKind::Press {
+                        match key.code {
+                            KeyCode::Char('q') => app.should_exit = true,
+                            
+                            // KeyCode::Up/Down etc => update nav intent/state
+                            _ => {}
+                        }
+                    }
+                }
+            }
+
+            // Tick for time-based navigation / animations
+            if last_tick.elapsed() >= tick_rate {
+                // app.on_tick(last_tick.elapsed());
+                last_tick = Instant::now();
+            }
+        }
+
+        Ok(())
+    })
+}
+
+fn render(frame: &mut Frame) {
+    use Constraint::{Fill};
+
+    let [top_area, rest_area] = Layout::vertical([Fill(1), Fill(12)]).areas(frame.area());
+
+    let [main_area, output_area] = Layout::vertical([Fill(9), Fill(3)])
+        .spacing(Spacing::Overlap(1))
+        .areas(rest_area);
+
+    let [left_main_area, right_main_area] = Layout::horizontal([Fill(2), Fill(5)])
+        .spacing(Spacing::Overlap(1))
+        .areas(main_area);
+
+    let [left_output_area, right_output_area] = Layout::horizontal([Fill(5), Fill(1)])
+        .spacing(Spacing::Overlap(1))
+        .areas(output_area);
+
+    frame.render_widget(Block::bordered(), top_area);
+    frame.render_widget(Block::bordered().merge_borders(MergeStrategy::Exact), left_output_area);
+    frame.render_widget(Block::bordered().merge_borders(MergeStrategy::Exact), right_output_area);
+    frame.render_widget(Block::bordered().merge_borders(MergeStrategy::Exact), left_main_area);
+    frame.render_widget(Block::bordered().merge_borders(MergeStrategy::Exact), right_main_area);
+}