Change background color of GNOME main panel when changing layouts

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1

Two keyboard layouts are installed: English and Russian. Is it possible to somehow make the main GNOME panel change background color when switching to the Russian layout, for example, from black (default) to dark blue?

Reason: when you often have to switch between layouts, it’s terribly inconvenient to look up right, what kind of layout is on (ru/en)

2

Any suggestions please?

3 
# shell extensions
sudo dnf -y install gnome-extensions-app gnome-shell-extension-user-theme
gnome-extensions enable user-theme@gnome-shell-extensions.gcampax.github.com

# input sources
gsettings set org.gnome.desktop.input-sources sources "[('xkb', 'us'), ('xkb', 'ru')]"

# shell themes
mkdir -p ~/.local/share/themes/custom-us/gnome-shell
tee ~/.local/share/themes/custom-us/gnome-shell/gnome-shell.css << EOF > /dev/null
#panel { background-color: rgba(0,0,0,1); }
#panel:overview { background-color: rgba(0,0,0,.5); }
EOF
mkdir -p ~/.local/share/themes/custom-ru/gnome-shell
tee ~/.local/share/themes/custom-ru/gnome-shell/gnome-shell.css << EOF > /dev/null
#panel { background-color: rgba(1,29,84,1); }
#panel:overview { background-color: rgba(1,29,84,.5); }
EOF

# bash script
mkdir -p ~/.local/bin
tee ~/.local/bin/gnome-panel-color.sh << "EOF" > /dev/null
#!/bin/bash
gsettings monitor org.gnome.desktop.input-sources mru-sources \
| sed -r -e "s/^\S*\s\S*\s'(\S*)'.*$/\
gsettings set org.gnome.shell.extensions.user-theme name custom-\1/e"
EOF
chmod +x ~/.local/bin/gnome-panel-color.sh

# systemd unit
mkdir -p ~/.config/systemd/user
tee ~/.config/systemd/user/gnome-panel-color.service << EOF > /dev/null
[Unit]
Description=Switch GNOME panel color based on input source
[Service]
ExecStart=${HOME}/.local/bin/gnome-panel-color.sh
[Install]
WantedBy=gnome-session.target
EOF
systemctl --user daemon-reload 
systemctl --user enable gnome-panel-color.service
systemctl --user restart gnome-panel-color.service