diff --git a/apps/BinaryKeyboard/README.md b/apps/BinaryKeyboard/README.md
index 133ff4d..a13395f 100644
--- a/apps/BinaryKeyboard/README.md
+++ b/apps/BinaryKeyboard/README.md
@@ -2,8 +2,10 @@
 
 Proof of concept for entering text by recursively bisecting a QWERTY-ordered character set.
 
-- Left side button selects the left group.
-- Right side button selects the right group.
+The full QWERTY layout stays in fixed positions. Remaining candidates are shaded by group; eliminated keys disappear.
+
+- Up selects the plain (white) group.
+- Down selects the shaded (dark) group.
 - Back undoes one choice, or exits from the root.
 - Confirm inserts a space.
 - Left front button deletes a character.
diff --git a/apps/BinaryKeyboard/main.lua b/apps/BinaryKeyboard/main.lua
index a7292e1..224c54c 100644
--- a/apps/BinaryKeyboard/main.lua
+++ b/apps/BinaryKeyboard/main.lua
@@ -1,10 +1,15 @@
 -- DESCRIPTION: Two-button recursive keyboard experiment
 
-local KEYS = {
-    "Q", "W", "E", "R", "T", "Y", "U", "I", "O", "P",
-    "A", "S", "D", "F", "G", "H", "J", "K", "L",
-    "Z", "X", "C", "V", "B", "N", "M"
+local ROWS = {
+    { "Q", "W", "E", "R", "T", "Y", "U", "I", "O", "P" },
+    { "A", "S", "D", "F", "G", "H", "J", "K", "L" },
+    { "Z", "X", "C", "V", "B", "N", "M" }
 }
+
+local KEYS = {}
+for _, row in ipairs(ROWS) do
+    for _, key in ipairs(row) do KEYS[#KEYS + 1] = key end
+end
 local MAX_TEXT_BYTES = 80
 
 local text = ""
@@ -57,21 +62,47 @@ local function undo()
     needsDraw = true
 end
 
-local function drawPanel(x, y, width, height, title, values)
-    gui.drawRoundedRect(x, y, width, height, 2, 8, COLOR_BLACK)
-    gui.drawText(FONT_UI_10, x + 12, y + 32, title, COLOR_BLACK, STYLE_BOLD)
-    gui.drawText(FONT_UI_12, x + 12, y + math.floor(height / 2), table.concat(values), COLOR_BLACK, STYLE_NORMAL)
+-- Side Lookup - Rendering needs per-key shading, but candidates are stored in layout order.
+local function sides()
+    local leftHalf, rightHalf = halves()
+    local result = {}
+    for _, key in ipairs(leftHalf) do result[key] = "left" end
+    for _, key in ipairs(rightHalf) do result[key] = "right" end
+    return result
+end
+
+local function drawKeyboard(width, top, bottom)
+    local gap = 6
+    local margin = 16
+    local keyWidth = math.floor((width - margin * 2 - gap * 9) / 10)
+    local keyHeight = math.min(56, math.floor((bottom - top - gap * 2) / 3))
+    local side = sides()
+
+    for rowIndex, row in ipairs(ROWS) do
+        local rowWidth = #row * keyWidth + (#row - 1) * gap
+        local startX = math.floor((width - rowWidth) / 2)
+        local y = top + (rowIndex - 1) * (keyHeight + gap)
+
+        for columnIndex, key in ipairs(row) do
+            local keySide = side[key]
+            if keySide then
+                local x = startX + (columnIndex - 1) * (keyWidth + gap)
+                local shaded = keySide == "right"
+                gui.fillRoundedRect(x, y, keyWidth, keyHeight, 4, shaded and COLOR_DARK_GRAY or COLOR_WHITE)
+                gui.drawRoundedRect(x, y, keyWidth, keyHeight, 1, 4, COLOR_BLACK)
+                local label = uppercase and key or key:lower()
+                local textX = x + math.floor((keyWidth - gui.getTextWidth(FONT_NOTOSANS_16, label, STYLE_BOLD)) / 2)
+                gui.drawText(FONT_NOTOSANS_16, textX, y + math.floor(keyHeight / 2) - 10, label,
+                    shaded and COLOR_WHITE or COLOR_BLACK, STYLE_BOLD)
+            end
+        end
+    end
 end
 
 local function render()
     local width = gui.width()
     local height = gui.height()
     local margin = 20
-    local gap = 12
-    local panelWidth = math.floor((width - margin * 2 - gap) / 2)
-    local panelTop = 185
-    local panelHeight = math.min(220, height - panelTop - 100)
-    local leftHalf, rightHalf = halves()
 
     gui.clear()
     gui.drawCenteredText(FONT_UI_12, 24, "Binary Keyboard", COLOR_BLACK, STYLE_BOLD)
@@ -79,10 +110,8 @@ local function render()
     local visibleText = text == "" and "Type with the side buttons" or text:sub(-38)
     gui.drawText(FONT_UI_12, margin + 12, 96, visibleText, COLOR_BLACK, STYLE_NORMAL)
 
-    local progress = string.rep("•", #history)
-    gui.drawCenteredText(FONT_UI_10, 155, progress == "" and "Choose a half" or progress, COLOR_BLACK, STYLE_NORMAL)
-    drawPanel(margin, panelTop, panelWidth, panelHeight, "LEFT SIDE", leftHalf)
-    drawPanel(margin + panelWidth + gap, panelTop, panelWidth, panelHeight, "RIGHT SIDE", rightHalf)
+    gui.drawCenteredText(FONT_UI_10, 170, "UP = plain    DOWN = shaded", COLOR_BLACK, STYLE_NORMAL)
+    drawKeyboard(width, 195, height - 90)
 
     gui.drawButtonHints(#history == 0 and "Exit" or "Undo", "Space", "Delete", uppercase and "lower" or "UPPER")
     gui.refresh(firstDraw and REFRESH_HALF or REFRESH_FAST)
diff --git a/apps/BinaryKeyboard/manifest.txt b/apps/BinaryKeyboard/manifest.txt
index 57a77ca..bd18ea6 100644
--- a/apps/BinaryKeyboard/manifest.txt
+++ b/apps/BinaryKeyboard/manifest.txt
@@ -1,2 +1,2 @@
 XTEINK-MANIFEST|1
-main.lua|3720|8e275a05358e32b0187a7e2c00a93eabe658a32c10112c5451e2d8a78f3d3932
+main.lua|4726|1a958ed089a1c3b6c8757298a94aed32fb2603732d83d3ed6c3ea98f31bd816a
diff --git a/catalog.txt b/catalog.txt
index 3c142d9..9ef08d1 100644
--- a/catalog.txt
+++ b/catalog.txt
@@ -1,5 +1,5 @@
 XTEINK-CATALOG|1
 AppStore|Install apps from public Xteink repositories|apps/AppStore/manifest.txt|192|2eb608b92de6bdeff4fc8ed447b9319f45c0d79d5d73b14db1ab5a92f91e42d4
-BinaryKeyboard|Two-button recursive keyboard experiment|apps/BinaryKeyboard/manifest.txt|97|b72b6250bb3124fb1639c9c1eb0c1b7730d62356189f450e26035dde288f9f2b
+BinaryKeyboard|Two-button recursive keyboard experiment|apps/BinaryKeyboard/manifest.txt|97|8d26b7d2057f7ebdca133b936ea5d2074e8771af5235e9bf9722689a6fd8f5fd
 HomeAssistant|Home Assistant status cards|apps/HomeAssistant/manifest.txt|177|b38ca49804444fd383a505ce9c51680ad9b7443950d682ca1b9ef3047bff98a5
 Wordle|Guess the five-letter word in six tries|apps/Wordle/manifest.txt|177|199fafdf0d0f6e77916befc011f6e8466c254867800e1d4a9e67e95a06d0366b