diff --git a/.typos.toml b/.typos.toml
index 9493ba73..2954acc0 100644
--- a/.typos.toml
+++ b/.typos.toml
@@ -11,7 +11,7 @@ extend-exclude = [
   "rime-data/",
   # small-duck flypy user dictionary: entries are pinyin codes ("delt", "juli"),
   # not English words, so the spell checker flags every one of them
-  "overlays/fcitx5/flypy_user.txt",
+  "home/base/gui/rime/flypy_user.txt",
 ]
 
 [default]
diff --git a/flake.lock b/flake.lock
index d13394a8..9990819a 100644
--- a/flake.lock
+++ b/flake.lock
@@ -941,11 +941,11 @@
         ]
       },
       "locked": {
-        "lastModified": 1791100543,
-        "narHash": "sha256-DsuozPwOkBqrobxHGRdAkIJ/XH4RlkklDAdCRZPspIc=",
+        "lastModified": 1791202937,
+        "narHash": "sha256-80qCd/nbv2E2SybjMwzu9nQNXEkU14skcWj4tBpM/wo=",
         "owner": "ryan4yin",
         "repo": "nur-packages",
-        "rev": "f7b563dd38adf37579465b28bfa5f34305cb59f3",
+        "rev": "ff5441119f114a934578f8c092bd6d1d01696ae8",
         "type": "github"
       },
       "original": {
diff --git a/home/base/README.md b/home/base/README.md
index 02a75055..ff542ca2 100644
--- a/home/base/README.md
+++ b/home/base/README.md
@@ -27,6 +27,7 @@ systems.
   - **dev-tools.nix**: Misc development and network tools (mitmproxy, wireshark)
   - **media.nix**: Media players and utilities
   - **zed-editor.nix**: Zed editor configuration (primary GUI editor)
+  - **rime/**: Rime (flypy) customisation shared by fcitx5-rime (Linux) and Squirrel (macOS)
   - **terminal/**: Terminal emulator configurations
     - **ghostty.nix**: Ghostty terminal (default)
     - **kitty.nix**: Kitty terminal
diff --git a/home/base/gui/rime/README.md b/home/base/gui/rime/README.md
new file mode 100644
index 00000000..84308564
--- /dev/null
+++ b/home/base/gui/rime/README.md
@@ -0,0 +1,47 @@
+# Rime (flypy) customisation
+
+Personal Rime setup for the [flypy](https://flypy.com/) (小鹤音形) schema, shared by fcitx5-rime
+(Linux) and Squirrel (macOS) so both behave the same.
+
+## Files
+
+- `flypy.custom.yaml`: the preferences, layered by Rime on top of the shared rime-data.
+- `flypy_user.txt`: the user dictionary (custom phrases, symbols, missing characters).
+- `default.nix`: per-platform wiring (see that file for the details).
+
+The schema data comes from the `rime-data-flypy` package in `nur-ryan4yin` and stays untouched, so
+updates survive. Personal preferences and the dictionary live here. On macOS the shared data
+includes an empty `flypy_user.txt`, so the user files set `home.fileOverlapResolution = "override"`
+to win over it.
+
+## Preferences
+
+- Right Shift switches CN/EN. Left Shift stays a plain modifier; Ctrl+Space also switches (fcitx5 on
+  Linux, the system input-source shortcut on macOS).
+- Shift+Space does not toggle full/half width.
+- `[ ] { }` produce corner brackets `「」『』`.
+
+These sit in a schema-level patch rather than `default.custom.yaml` so they also override the
+`default` preset and flypy's own bindings, and to avoid colliding with the `default.custom.yaml`
+that ships in Squirrel's user directory.
+
+## Hotkeys
+
+The flypy schema brings its own bindings. Two worth remembering:
+
+- Ctrl+J toggles simplified/traditional Chinese (简繁).
+- Ctrl+. toggles Chinese/ASCII punctuation (中英标点).
+
+## Applying changes
+
+`flypy.custom.yaml` is a store symlink with an epoch mtime, so Rime does not redeploy when it
+changes. Remove `build/` and reload:
+
+```sh
+# Linux
+rm -rf ~/.local/share/fcitx5/rime/build
+fcitx5-remote -r
+
+# macOS: remove build/, then restart Squirrel
+rm -rf ~/Library/Rime/build
+```
diff --git a/home/base/gui/rime/default.nix b/home/base/gui/rime/default.nix
new file mode 100644
index 00000000..5bc02d6d
--- /dev/null
+++ b/home/base/gui/rime/default.nix
@@ -0,0 +1,42 @@
+{
+  inputs,
+  lib,
+  pkgs,
+  ...
+}:
+let
+  # flypy (小鹤音形) rime data from nur-ryan4yin (`pkgs/rime-data-flypy`). The
+  # package stays pristine; personal preferences live in flypy.custom.yaml.
+  rime-data-flypy = inputs.nur-ryan4yin.packages.${pkgs.stdenv.hostPlatform.system}.rime-data-flypy;
+  # Personal Rime customisation, layered by Rime on top of the shared rime-data.
+  custom = ./flypy.custom.yaml;
+  # Manually maintained user dictionary (custom phrases, symbols, missing
+  # characters); Rime reads it from the user directory.
+  user-dict = ./flypy_user.txt;
+in
+lib.mkMerge [
+  # Linux: fcitx5-rime, with its user directory in ~/.local/share/fcitx5/rime.
+  (lib.mkIf pkgs.stdenv.hostPlatform.isLinux {
+    # Chinese: flypy (小鹤音形) data instead of the default rime-data.
+    i18n.inputMethod.fcitx5.addons = [
+      (pkgs.fcitx5-rime.override { rimeDataPkgs = [ rime-data-flypy ]; })
+    ];
+    xdg.dataFile."fcitx5/rime/flypy.custom.yaml".source = custom;
+    xdg.dataFile."fcitx5/rime/flypy_user.txt".source = user-dict;
+  })
+
+  # macOS: Squirrel reads shared data from ~/Library/Rime, so link the data there.
+  # Its `flypy_user.txt` template overlaps our dictionary, so the regular files
+  # below must win. This is the only recursive link in the configuration.
+  (lib.mkIf pkgs.stdenv.hostPlatform.isDarwin {
+    home.fileOverlapResolution = "override";
+    home.file."Library/Rime" = {
+      source = "${rime-data-flypy}/share/rime-data";
+      recursive = true;
+      # overwrite possible existing data dynamically generated by squirrel
+      force = true;
+    };
+    home.file."Library/Rime/flypy.custom.yaml".source = custom;
+    home.file."Library/Rime/flypy_user.txt".source = user-dict;
+  })
+]
diff --git a/home/base/gui/rime/flypy.custom.yaml b/home/base/gui/rime/flypy.custom.yaml
new file mode 100644
index 00000000..3890a3f1
--- /dev/null
+++ b/home/base/gui/rime/flypy.custom.yaml
@@ -0,0 +1,52 @@
+# Personal Rime customisation for the flypy (小鹤音形) schema, layered on top of
+# the shared rime-data by Rime's <schema>.custom.yaml mechanism. See README.md.
+patch:
+  # Right Shift switches CN/EN; left Shift stays a plain modifier. The stock
+  # flypy schema switches on Shift_L, so keep the explicit noop. Ctrl+Space also
+  # switches (fcitx5 on Linux; the system input-source shortcut on macOS).
+  ascii_composer/switch_key/Shift_L: noop
+  ascii_composer/switch_key/Shift_R: commit_code
+
+  # Disable the stock `Shift+space -> toggle full_shape` binding. flypy declares
+  # its own copy after the one imported from `default`, so the override must be a
+  # schema-level `bindings/+` (appended last, highest priority) with `unset_option`.
+  key_binder/bindings/+:
+    - { when: always, accept: "Shift+space", unset_option: full_shape }
+
+  # Prefer corner brackets over the upstream `【】｛｝` for [ ] { }.
+  "punctuator/full_shape/[":
+    - 「
+    - 【
+    - 〔
+    - ［
+  "punctuator/full_shape/]":
+    - 」
+    - 】
+    - 〕
+    - ］
+  "punctuator/full_shape/{":
+    - 『
+    - 〖
+    - ｛
+  "punctuator/full_shape/}":
+    - 』
+    - 〗
+    - ｝
+  "punctuator/half_shape/[":
+    - 「
+    - 【
+    - 〔
+    - ［
+  "punctuator/half_shape/]":
+    - 」
+    - 】
+    - 〕
+    - ］
+  "punctuator/half_shape/{":
+    - 『
+    - 〖
+    - ｛
+  "punctuator/half_shape/}":
+    - 』
+    - 〗
+    - ｝
diff --git a/overlays/fcitx5/flypy_user.txt b/home/base/gui/rime/flypy_user.txt
similarity index 100%
rename from overlays/fcitx5/flypy_user.txt
rename to home/base/gui/rime/flypy_user.txt
diff --git a/home/darwin/README.md b/home/darwin/README.md
index cc0142a1..eb7250ca 100644
--- a/home/darwin/README.md
+++ b/home/darwin/README.md
@@ -9,8 +9,6 @@ This directory contains macOS-specific Home Manager configurations for Darwin sy
 - **default.nix**: Entry point that imports all Darwin configurations
 - **shell.nix**: Shell configurations and environment settings
 - **terminal.nix**: Sets a 15px font size across Ghostty and Kitty
-- **rime-squirrel.nix**: [Rime Squirrel](https://github.com/rime/squirrel) input method
-  configuration
 
 ### Network Configuration
 
diff --git a/home/darwin/rime-squirrel.nix b/home/darwin/rime-squirrel.nix
deleted file mode 100644
index 2903630e..00000000
--- a/home/darwin/rime-squirrel.nix
+++ /dev/null
@@ -1,12 +0,0 @@
-{ pkgs, ... }:
-{
-  # Squirrel Input Method
-  home.file."Library/Rime" = {
-    # my custom squirrel data (flypy input method)
-    source = "${pkgs.flypy-squirrel}/share/rime-data";
-    recursive = true;
-    # overwrite possible existing data dynamically generated by squirrel
-    # https://github.com/nix-community/home-manager/blob/release-23.05/modules/lib/file-type.nix#L101-L111
-    force = true;
-  };
-}
diff --git a/outputs/default.nix b/outputs/default.nix
index 59231dae..f91c9de4 100644
--- a/outputs/default.nix
+++ b/outputs/default.nix
@@ -192,7 +192,7 @@ in
               configPath = ".typos.toml"; # relative to the flake root
               # git-hooks passes paths on the command line, which makes typos
               # ignore .typos.toml's extend-exclude, so repeat it here
-              exclude = "rime-data/|overlays/fcitx5/flypy_user.txt";
+              exclude = "rime-data/|home/base/gui/rime/flypy_user.txt";
             };
           };
           prettier = {
diff --git a/overlays/README.md b/overlays/README.md
index 9c301b1e..54d2f5e5 100644
--- a/overlays/README.md
+++ b/overlays/README.md
@@ -13,27 +13,8 @@ overlays/
 ├── default.nix            # Entrypoint for all overlays
 ├── computer-use-linux.nix # computer-use-linux from ryan4yin/nur-packages
 ├── cua-driver.nix         # cua-driver from ryan4yin/nur-packages
-├── smartctl-exporter/     # smartctl_exporter pinned to the #329 fix
-│   └── default.nix
-└── fcitx5/                # Chinese input method configuration
-    ├── README.md
-    ├── default.nix        # fcitx5 overlay definition
-    └── rime-data-flypy/   # Custom rime data for 小鹤音形输入法
-        └── share/
-            └── rime-data/
-                ├── build/
-                ├── default.custom.yaml
-                ├── default.yaml
-                ├── flypy.schema.yaml
-                ├── flypy_full全码字.txt
-                ├── flypy_sys.txt
-                ├── flypy_top.txt
-                ├── flypy_user.txt
-                ├── lua/
-                │   └── calculator_translator.lua
-                ├── rime.lua
-                ├── squirrel.custom.yaml
-                └── squirrel.yaml
+└── smartctl-exporter/     # smartctl_exporter pinned to the #329 fix
+    └── default.nix
 ```
 
 ## Components
@@ -43,17 +24,7 @@ overlays/
 The entrypoint of overlays, it execute and import all overlay files in the current directory with
 the given args.
 
-### 2. `fcitx5`
-
-fcitx5's overlay, add my customized Chinese input method - [小鹤音形输入法](https://flypy.com/)
-
-This overlay provides:
-
-- Custom rime data for 小鹤音形输入法 (Flypy input method)
-- Cross-platform support for both Linux (fcitx5-rime) and macOS (squirrel)
-- Pre-configured input method settings
-
-### 3. Package overlays
+### 2. Package overlays
 
 - `computer-use-linux.nix`: exposes `computer-use-linux` from the `nur-ryan4yin` flake input.
 - `cua-driver.nix`: exposes `cua-driver` from the `nur-ryan4yin` flake input (used by the
diff --git a/overlays/fcitx5/README.md b/overlays/fcitx5/README.md
deleted file mode 100644
index 74111430..00000000
--- a/overlays/fcitx5/README.md
+++ /dev/null
@@ -1,27 +0,0 @@
-# rime-data for flypy input method
-
-Useful for Linux(fcitx5-rime) & macOS(squirrel).
-
-## Data source
-
-The schema data comes from the `rime-data-flypy` package in
-[nur-ryan4yin](https://github.com/ryan4yin/nur-packages). This overlay adds the personal user
-dictionary (`flypy_user.txt`) on top and exposes the merged result as `pkgs.rime-data`,
-`pkgs.fcitx5-rime`'s `rimeDataPkgs`, and `pkgs.flypy-squirrel`.
-
-## Linux(fcitx5-rime)
-
-1. `~/.config/fcitx5/profile` is linked to
-   [home/linux/gui/base/fcitx5/profile](../../home/linux/gui/base/fcitx5/profile), which hardcode
-   rime as the default input method, so you do not need to use fcitx-configtool to adjust fcitx5's
-   input method.
-
-## macOS(squirrel)
-
-1. ` ~/Library/Rime/` is force linked to this rime-data, see
-   [home/darwin/rime-squirrel.nix](../../home/darwin/rime-squirrel.nix) for details.
-
-## Docs about fcitx5
-
-- [Fcitx5 - Arch Linux Wiki](https://wiki.archlinux.org/title/Fcitx5)
-- [Fcitx5 - Official Wiki](https://fcitx-im.org/wiki/Fcitx_5/zh-cn)
diff --git a/overlays/fcitx5/default.nix b/overlays/fcitx5/default.nix
deleted file mode 100644
index e4ca1ad3..00000000
--- a/overlays/fcitx5/default.nix
+++ /dev/null
@@ -1,25 +0,0 @@
-# 为了不使用默认的 rime-data，改用小鹤音形数据，这里需要 override
-# 参考 https://github.com/NixOS/nixpkgs/blob/e4246ae1e7f78b7087dce9c9da10d28d3725025f/pkgs/tools/inputmethods/fcitx5/fcitx5-rime.nix
-{ inputs, ... }:
-(
-  _: super:
-  let
-    # 小鹤音形 schema 数据，来自 nur-ryan4yin 的 rime-data-flypy，
-    # 再叠加我自己的用户词库 flypy_user.txt。
-    rime-data-flypy = inputs.nur-ryan4yin.packages.${super.stdenv.hostPlatform.system}.rime-data-flypy;
-
-    rime-data = super.runCommandLocal "rime-data-flypy-custom" { } ''
-      mkdir -p $out/share/rime-data
-      cp -r ${rime-data-flypy}/share/rime-data/. $out/share/rime-data/
-      chmod -R u+w $out/share/rime-data
-      cp ${./flypy_user.txt} $out/share/rime-data/flypy_user.txt
-    '';
-  in
-  {
-    inherit rime-data;
-    fcitx5-rime = super.fcitx5-rime.override { rimeDataPkgs = [ rime-data ]; };
-
-    # used by macOS Squirrel
-    flypy-squirrel = rime-data;
-  }
-)