diff --git a/crates/render/src/lib.rs b/crates/render/src/lib.rs
--- a/crates/render/src/lib.rs
+++ b/crates/render/src/lib.rs
@@ -575,8 +575,9 @@ pub struct RenderOptions {
     pub read_paper: Option<Rgb>,
 }
 
-/// Default grey for a dark page's paper.
-pub const DARK_PAPER: u8 = 0x33;
+/// Default grey for a dark page's paper: `#181818`, the page the reference Writer document uses
+/// (WordCraft's dark page used to be a lighter `#333`).
+pub const DARK_PAPER: u8 = 0x18;
 
 /// Read Mode's Sepia paper: Word's RGB (112, 66, 20) at 80% transparency over white.
 pub const SEPIA_PAPER: Rgb = Rgb(0xE2, 0xD9, 0xD0);
diff --git a/crates/ui-egui/src/canvas.rs b/crates/ui-egui/src/canvas.rs
--- a/crates/ui-egui/src/canvas.rs
+++ b/crates/ui-egui/src/canvas.rs
@@ -1489,6 +1489,9 @@ pub fn show(app: &mut WordApp, ui: &mut Ui) {
             } else if let Some((_, tex)) = app.canvas.textures.get(&i) {
                 painter.image(tex.id(), visual_sr, Rect::from_min_max(pos2(0.0, 0.0), pos2(1.0, 1.0)), Color32::WHITE);
             }
+            // The sheet's edge, drawn over the content: it is what tells a dark page from the
+            // workspace around it (#2572).
+            painter.rect_stroke(visual_sr, 0.0, Stroke::new(1.0, t.page_border), egui::StrokeKind::Inside);
             let page_scale = page_screen_scale(visual_sr, page, geo.scale);
             // Header/footer editing chrome.
             if let StoryRef::Part(id) = app.session.sel.focus.story {
diff --git a/crates/ui-egui/src/theme.rs b/crates/ui-egui/src/theme.rs
--- a/crates/ui-egui/src/theme.rs
+++ b/crates/ui-egui/src/theme.rs
@@ -264,6 +264,12 @@ pub struct Tokens {
     /// Find › Reading Highlight.
     pub find_highlight: Color32,
     pub page_shadow: Color32,
+    /// The one-pixel edge around each sheet: keeps a page visible when its own colour is close
+    /// to the workspace's (a dark page colour in the dark theme), as Writer's page edge does.
+    pub page_border: Color32,
+    /// The Navigation pane's tree connectors (the guides joining a heading to its parent): thin
+    /// lines that must read on the pane without competing with the headings themselves.
+    pub tree_line: Color32,
     /// Selection-frame handles (pictures, shapes, text boxes) and their shadow.
     pub handle: Color32,
     pub handle_shadow: Color32,
@@ -332,6 +338,8 @@ impl Tokens {
             selection: Color32::from_rgba_unmultiplied(0x3B, 0x5B, 0xDB, 0x48),
             find_highlight: Color32::from_rgba_unmultiplied(0xFF, 0xE0, 0x3D, 0x90),
             page_shadow: Color32::from_rgba_unmultiplied(0, 0, 0, 0x22),
+            page_border: Color32::from_rgb(0xC8, 0xC8, 0xC8),
+            tree_line: Color32::from_rgb(0xBD, 0xBD, 0xC2),
             handle: Color32::WHITE,
             handle_shadow: Color32::from_rgba_unmultiplied(0, 0, 0, 0x28),
             guide: Color32::from_rgb(0xC0, 0x28, 0x8C),
@@ -372,7 +380,9 @@ impl Tokens {
             title_bar: Color32::from_rgb(0x1F, 0x1F, 0x1F),
             ribbon: Color32::from_rgb(0x29, 0x29, 0x29),
             tab_strip: Color32::from_rgb(0x1F, 0x1F, 0x1F),
-            canvas: Color32::from_rgb(0x14, 0x14, 0x14),
+            // Writer's workspace around a sheet (#222226): dark pages (e.g. #181818) still stand
+            // out from it, with the page's own edge doing the rest.
+            canvas: Color32::from_rgb(0x22, 0x22, 0x26),
             panel: Color32::from_rgb(0x26, 0x26, 0x26),
             border: Color32::from_rgb(0x3A, 0x3A, 0x3A),
             border_strong: Color32::from_rgb(0x55, 0x55, 0x55),
@@ -398,7 +408,11 @@ impl Tokens {
             status_bar: Color32::from_rgb(0x1F, 0x1F, 0x1F),
             selection: Color32::from_rgba_unmultiplied(0x7A, 0x93, 0xF0, 0x55),
             find_highlight: Color32::from_rgba_unmultiplied(0xC8, 0xA8, 0x00, 0x70),
-            page_shadow: Color32::from_rgba_unmultiplied(0, 0, 0, 0x60),
+            page_shadow: Color32::from_rgba_unmultiplied(0, 0, 0, 0x70),
+            page_border: Color32::from_rgb(0x3E, 0x3E, 0x45),
+            // Clearer than `border` on the pane (#262626): the tree's thin connectors were almost
+            // invisible in the dark theme.
+            tree_line: Color32::from_rgb(0x55, 0x55, 0x5E),
             handle: Color32::from_rgb(0xF2, 0xF2, 0xF2),
             handle_shadow: Color32::from_rgba_unmultiplied(0, 0, 0, 0x5A),
             guide: Color32::from_rgb(0xE0, 0x4C, 0xB0),