diff --git a/.gitignore b/.gitignore
index ea3e2dc..a041459 100644
--- a/.gitignore
+++ b/.gitignore
@@ -20,3 +20,4 @@ __pycache__/
 # Generated from the colour scheme; machine state, not configuration.
 /config/dot/gtk-3.0/settings.ini
 /config/dot/gtk-4.0/settings.ini
+/config/dot/tmux/current-theme.conf
diff --git a/config/dot/btop/themes/tokyonight-day.theme b/config/dot/btop/themes/tokyonight-day.theme
new file mode 100644
index 0000000..6932b74
--- /dev/null
+++ b/config/dot/btop/themes/tokyonight-day.theme
@@ -0,0 +1,57 @@
+# Tokyo Night Day for btop, the light counterpart to tokyonight-moon.
+#
+# btop ships no Tokyo Night light variant at all, and the nearest stock light
+# theme (flat-remix-light) is a different palette that happens to have a similar
+# background. Same colours as kitty/themes/tokyonight-day.conf so the terminal
+# and what runs inside it cannot disagree.
+#
+# Gradients keep the same low -> middle -> high meaning as the dark theme, using
+# Day's darker, more saturated accents: the light versions of these hues are too
+# faint to read as a filled meter.
+
+theme[main_bg]="#e1e2e7"
+theme[main_fg]="#3760bf"
+theme[title]="#3760bf"
+theme[hi_fg]="#2e7de9"
+theme[selected_bg]="#c4c8da"
+theme[selected_fg]="#2e7de9"
+theme[inactive_fg]="#7079a8"
+theme[proc_misc]="#587539"
+
+theme[cpu_box]="#a8aecb"
+theme[mem_box]="#a8aecb"
+theme[net_box]="#a8aecb"
+theme[proc_box]="#a8aecb"
+theme[div_line]="#c4c8da"
+
+theme[temp_start]="#2e7de9"
+theme[temp_mid]="#8c6c3e"
+theme[temp_end]="#f52a65"
+
+theme[cpu_start]="#2e7de9"
+theme[cpu_mid]="#9854f1"
+theme[cpu_end]="#f52a65"
+
+theme[free_start]="#c4c8da"
+theme[free_mid]="#007197"
+theme[free_end]="#2e7de9"
+
+theme[cached_start]="#007197"
+theme[cached_mid]="#2e7de9"
+theme[cached_end]="#9854f1"
+
+theme[available_start]="#8c6c3e"
+theme[available_mid]="#b15c00"
+theme[available_end]="#f52a65"
+
+theme[used_start]="#587539"
+theme[used_mid]="#8c6c3e"
+theme[used_end]="#f52a65"
+
+theme[download_start]="#c4c8da"
+theme[download_mid]="#2e7de9"
+theme[download_end]="#007197"
+
+theme[upload_start]="#c4c8da"
+theme[upload_mid]="#9854f1"
+theme[upload_end]="#7847bd"
diff --git a/config/dot/btop/themes/tokyonight-moon.theme b/config/dot/btop/themes/tokyonight-moon.theme
new file mode 100644
index 0000000..6e26075
--- /dev/null
+++ b/config/dot/btop/themes/tokyonight-moon.theme
@@ -0,0 +1,56 @@
+# Tokyo Night Moon for btop, matched to Panama's palette.
+#
+# btop ships a "tokyo-night" theme, but it is the Night variant (#1a1b26). The
+# rest of this desktop is Moon (#222436), and two Tokyo Nights side by side read
+# as a mistake rather than as a choice.
+#
+# The *_start/_mid/_end triples are gradients btop draws meters with: low,
+# middle, and high. They run blue -> yellow -> red so a saturated resource is
+# obvious at a glance without reading the number.
+
+theme[main_bg]="#222436"
+theme[main_fg]="#c8d3f5"
+theme[title]="#c8d3f5"
+theme[hi_fg]="#82aaff"
+theme[selected_bg]="#3b4261"
+theme[selected_fg]="#82aaff"
+theme[inactive_fg]="#636da6"
+theme[proc_misc]="#a5e8b5"
+
+theme[cpu_box]="#4d5685"
+theme[mem_box]="#4d5685"
+theme[net_box]="#4d5685"
+theme[proc_box]="#4d5685"
+theme[div_line]="#3b4261"
+
+theme[temp_start]="#82aaff"
+theme[temp_mid]="#ffc777"
+theme[temp_end]="#ff757f"
+
+theme[cpu_start]="#82aaff"
+theme[cpu_mid]="#c099ff"
+theme[cpu_end]="#ff757f"
+
+theme[free_start]="#3b4261"
+theme[free_mid]="#589ed7"
+theme[free_end]="#86e1fc"
+
+theme[cached_start]="#86e1fc"
+theme[cached_mid]="#82aaff"
+theme[cached_end]="#c099ff"
+
+theme[available_start]="#ffc777"
+theme[available_mid]="#ff966c"
+theme[available_end]="#ff757f"
+
+theme[used_start]="#a5e8b5"
+theme[used_mid]="#ffc777"
+theme[used_end]="#ff757f"
+
+theme[download_start]="#3b4261"
+theme[download_mid]="#82aaff"
+theme[download_end]="#86e1fc"
+
+theme[upload_start]="#3b4261"
+theme[upload_mid]="#c099ff"
+theme[upload_end]="#fca7ea"
diff --git a/config/dot/quickshell/scripts/panama-theme-apps b/config/dot/quickshell/scripts/panama-theme-apps
index a33ff31..23be064 100755
--- a/config/dot/quickshell/scripts/panama-theme-apps
+++ b/config/dot/quickshell/scripts/panama-theme-apps
@@ -31,6 +31,54 @@ case "$scheme" in
     *) printf 'usage: panama-theme-apps [dark|light]\n' >&2; exit 2 ;;
 esac
 
+# ── tmux ─────────────────────────────────────────────────────────────────────
+# Generated like kitty's: tmux.conf sources current-theme.conf, and that file is
+# machine state rather than configuration. Running servers are re-sourced so an
+# open session changes now instead of at next launch -- tmux applies a
+# source-file to every attached client immediately.
+tmux_dir="${XDG_CONFIG_HOME:-$HOME/.config}/tmux"
+tmux_theme="$tmux_dir/themes/tokyonight-moon.conf"
+[[ "$scheme" == "light" ]] && tmux_theme="$tmux_dir/themes/tokyonight-day.conf"
+
+status_tmux="skipped"
+if [[ -r "$tmux_theme" ]]; then
+    if cp "$tmux_theme" "$tmux_dir/current-theme.conf.tmp" 2>/dev/null \
+        && mv "$tmux_dir/current-theme.conf.tmp" "$tmux_dir/current-theme.conf" 2>/dev/null; then
+        status_tmux="written"
+        # Only if a server is actually running; `tmux source-file` would
+        # otherwise start one just to theme it.
+        if command -v tmux >/dev/null 2>&1 && tmux has-session 2>/dev/null; then
+            tmux source-file "$tmux_dir/current-theme.conf" 2>/dev/null \
+                && status_tmux="applied to running sessions"
+        fi
+    else
+        rm -f "$tmux_dir/current-theme.conf.tmp"
+        status_tmux="failed"
+    fi
+fi
+
+# ── btop ─────────────────────────────────────────────────────────────────────
+# Only the color_theme line is rewritten, in place. btop OWNS btop.conf -- it
+# rewrites the whole file on exit -- so the config is not symlinked into Panama
+# and not replaced wholesale here; just this one value is edited, and btop keeps
+# it on the next write.
+#
+# btop reads its theme once at startup, so a running instance keeps the old
+# colours until it is restarted. That is acceptable for a monitor you open when
+# you want it, and forcing a restart would kill a process the user is watching.
+btop_conf="${XDG_CONFIG_HOME:-$HOME/.config}/btop/btop.conf"
+btop_theme="tokyonight-moon"
+[[ "$scheme" == "light" ]] && btop_theme="tokyonight-day"
+
+status_btop="skipped"
+if [[ -w "$btop_conf" ]]; then
+    if sed -i "s|^color_theme *=.*|color_theme = \"$btop_theme\"|" "$btop_conf" 2>/dev/null; then
+        status_btop="written"
+    else
+        status_btop="failed"
+    fi
+fi
+
 # ── GTK ──────────────────────────────────────────────────────────────────────
 # adw-gtk3, not Adwaita: no Adwaita GTK theme is installed on Fedora 44, and
 # naming a theme that does not exist makes GTK fall back to its light default --
@@ -89,4 +137,13 @@ if [[ -r "$theme_file" ]]; then
     fi
 fi
 
-printf '{"scheme":"%s","kitty":"%s"}\n' "$scheme" "$status_kitty"
+# Every target reports what actually happened. A helper that says only
+# "kitty: applied" while silently skipping three other applications is how a
+# half-applied theme goes unnoticed.
+jq -cn \
+    --arg scheme "$scheme" \
+    --arg kitty "$status_kitty" \
+    --arg gtk "$status_gtk" \
+    --arg btop "$status_btop" \
+    --arg tmux "$status_tmux" \
+    '{scheme: $scheme, kitty: $kitty, gtk: $gtk, btop: $btop, tmux: $tmux}'
diff --git a/config/dot/tmux/themes/tokyonight-day.conf b/config/dot/tmux/themes/tokyonight-day.conf
new file mode 100644
index 0000000..ca7338f
--- /dev/null
+++ b/config/dot/tmux/themes/tokyonight-day.conf
@@ -0,0 +1,30 @@
+# Tokyo Night Day for tmux -- the light counterpart to tokyonight-moon.conf.
+#
+# Same structure, same roles, Day's palette. Mapped role for role rather than by
+# hue: #1b1d2b was text drawn ON an accent block, so it becomes the LIGHT ground
+# rather than a dark colour, or the status bar would be dark text on a dark
+# accent in light mode.
+#
+# The accents are Day's DARKER variants, not its standard ones. Measured against
+# the panel, the standard #2e7de9 and #9854f1 give 2.74:1 and 2.94:1 -- under
+# the 3:1 floor for text. These give 4.42:1 and 4.17:1, and 5.01:1 / 4.73:1 for
+# the light text drawn on top of them in the inverted blocks.
+
+set -g mode-style "fg=#1c5bb8,bg=#d0d5e3"
+
+set -g message-style "fg=#1c5bb8,bg=#d0d5e3"
+set -g message-command-style "fg=#1c5bb8,bg=#d0d5e3"
+
+set -g pane-border-style "fg=#1c5bb8"
+set -g pane-active-border-style "fg=#7847bd"
+
+set -g status-style "fg=#7847bd,bg=#d0d5e3"
+set -g status-bg "#e1e2e7"
+
+set -g status-left "#[fg=#e1e2e7,bg=#7847bd,bold] #S #[fg=#e1e2e7,bg=#7847bd,nobold,nounderscore,noitalics]"
+set -g status-right "#[fg=#e1e2e7,bg=#1c5bb8,nobold,nounderscore,noitalics]#[fg=#7847bd,bg=#d0d5e3] #{prefix_highlight} #[fg=#d0d5e3,bg=#d0d5e3]#[fg=#7847bd,bg=#d0d5e3] %Y/%m/%d  %I:%M %p #[fg=#1c5bb8,bg=#d0d5e3,nobold,nounderscore,noitalics]#[fg=#e1e2e7,bg=#7847bd,bold,italics] #h "
+
+setw -g window-status-format "#[fg=#e1e2e7,bg=#d0d5e3,nobold,nounderscore,noitalics]#[fg=#1c5bb8,bg=#d0d5e3] #I  #W #F #[fg=#e1e2e7,bg=#d0d5e3,nobold,nounderscore,noitalics]"
+setw -g window-status-current-format "#[fg=#e1e2e7,bg=#d0d5e3,nobold,nounderscore,noitalics]#[fg=#7847bd,bg=#d0d5e3,bold] #I  #W #F #[fg=#d0d5e3,bg=#d0d5e3,nobold,nounderscore,noitalics]"
+
+setw -g window-status-separator ""
diff --git a/config/dot/tmux/themes/tokyonight-moon.conf b/config/dot/tmux/themes/tokyonight-moon.conf
new file mode 100644
index 0000000..51cf3d2
--- /dev/null
+++ b/config/dot/tmux/themes/tokyonight-moon.conf
@@ -0,0 +1,25 @@
+# Tokyo Night Moon for tmux -- the palette Panama ships.
+#
+# Extracted from tmux.conf so the two schemes can be swapped. tmux.conf sources
+# current-theme.conf, which panama-theme-apps generates from one of these.
+#
+# Every colour here was already in tmux.conf; this file is that block verbatim.
+
+set -g mode-style "fg=#82aaff,bg=#3b4261"
+
+set -g message-style "fg=#82aaff,bg=#3b4261"
+set -g message-command-style "fg=#82aaff,bg=#3b4261"
+
+set -g pane-border-style "fg=#82aaff"
+set -g pane-active-border-style "fg=#b172b0"
+
+set -g status-style "fg=#b172b0,bg=#3b4261"
+set -g status-bg "#222436"
+
+set -g status-left "#[fg=#1b1d2b,bg=#b172b0,bold] #S #[fg=#1b1d2b,bg=#b172b0,nobold,nounderscore,noitalics]"
+set -g status-right "#[fg=#1b1d2b,bg=#82aaff,nobold,nounderscore,noitalics]#[fg=#b172b0,bg=#3b4261] #{prefix_highlight} #[fg=#3b4261,bg=#3b4261]#[fg=#b172b0,bg=#3b4261] %Y/%m/%d  %I:%M %p #[fg=#82aaff,bg=#3b4261,nobold,nounderscore,noitalics]#[fg=#1b1d2b,bg=#b172b0,bold,italics] #h "
+
+setw -g window-status-format "#[fg=#1b1d2b,bg=#3b4261,nobold,nounderscore,noitalics]#[fg=#82aaff,bg=#3b4261] #I  #W #F #[fg=#1b1d2b,bg=#3b4261,nobold,nounderscore,noitalics]"
+setw -g window-status-current-format "#[fg=#1b1d2b,bg=#3b4261,nobold,nounderscore,noitalics]#[fg=#b172b0,bg=#3b4261,bold] #I  #W #F #[fg=#3b4261,bg=#3b4261,nobold,nounderscore,noitalics]"
+
+setw -g window-status-separator ""
diff --git a/config/dot/tmux/tmux.conf b/config/dot/tmux/tmux.conf
index 47c686e..636c7ba 100644
--- a/config/dot/tmux/tmux.conf
+++ b/config/dot/tmux/tmux.conf
@@ -19,24 +19,10 @@ bind C-Space send-prefix
 # Set status bar
 #set -g status-bg pink
 # Tokyo Night Moon color palette
-set -g mode-style "fg=#82aaff,bg=#3b4261"
-
-set -g message-style "fg=#82aaff,bg=#3b4261"
-set -g message-command-style "fg=#82aaff,bg=#3b4261"
-
-set -g pane-border-style "fg=#82aaff"
-set -g pane-active-border-style "fg=#b172b0"
-
-set -g status-style "fg=#b172b0,bg=#3b4261"
-set -g status-bg "#222436"
-
-set -g status-left "#[fg=#1b1d2b,bg=#b172b0,bold] #S #[fg=#1b1d2b,bg=#b172b0,nobold,nounderscore,noitalics]"
-set -g status-right "#[fg=#1b1d2b,bg=#82aaff,nobold,nounderscore,noitalics]#[fg=#b172b0,bg=#3b4261] #{prefix_highlight} #[fg=#3b4261,bg=#3b4261]#[fg=#b172b0,bg=#3b4261] %Y/%m/%d  %I:%M %p #[fg=#82aaff,bg=#3b4261,nobold,nounderscore,noitalics]#[fg=#1b1d2b,bg=#b172b0,bold,italics] #h "
-
-setw -g window-status-format "#[fg=#1b1d2b,bg=#3b4261,nobold,nounderscore,noitalics]#[fg=#82aaff,bg=#3b4261] #I  #W #F #[fg=#1b1d2b,bg=#3b4261,nobold,nounderscore,noitalics]"
-setw -g window-status-current-format "#[fg=#1b1d2b,bg=#3b4261,nobold,nounderscore,noitalics]#[fg=#b172b0,bg=#3b4261,bold] #I  #W #F #[fg=#3b4261,bg=#3b4261,nobold,nounderscore,noitalics]"
-
-setw -g window-status-separator ""
+# Colours live in themes/ and are generated into current-theme.conf by
+# panama-theme-apps, which regenerates it whenever the desktop colour scheme
+# changes. -q so a fresh checkout without the generated file still starts.
+source-file -q "~/.config/tmux/current-theme.conf"
 
 # Increase scrollback buffer
 set -g history-limit 50000
diff --git a/setup/scripts/link-dotfiles b/setup/scripts/link-dotfiles
index 352480b..ad29e48 100755
--- a/setup/scripts/link-dotfiles
+++ b/setup/scripts/link-dotfiles
@@ -70,6 +70,45 @@ for dir in "${dirs[@]}"; do
   log "Linked $PANAMA_DOT/$dir → $CONFIG/$dir"
 done
 
+# tmux.conf ends with a source-file of current-theme.conf, generated from the
+# colour scheme rather than committed. Seed it so a fresh checkout starts themed
+# -- the source-file is -q, so a missing file is silent, which would leave tmux
+# unstyled with nothing to explain it.
+TMUX_THEME="$PANAMA_DOT/tmux/current-theme.conf"
+if [ -e "$TMUX_THEME" ]; then
+  log "Keeping existing tmux theme at $TMUX_THEME"
+elif [ -d "$PANAMA_DOT/tmux/themes" ]; then
+  tmux_scheme="dark"
+  tmux_prefs="${XDG_CONFIG_HOME:-$HOME/.config}/panama/settings.json"
+  if [ -r "$tmux_prefs" ]; then
+    tmux_stored="$(jq -r '.colorScheme // "dark"' "$tmux_prefs" 2>/dev/null || echo dark)"
+    [ "$tmux_stored" = "light" ] && tmux_scheme="light"
+  fi
+  [ "$tmux_scheme" = "light" ] && tmux_name="tokyonight-day" || tmux_name="tokyonight-moon"
+  cp "$PANAMA_DOT/tmux/themes/$tmux_name.conf" "$TMUX_THEME"
+  log "Seeded tmux $tmux_scheme theme ($tmux_name) → $TMUX_THEME"
+fi
+
+# btop reads themes from its own config directory, but OWNS btop.conf -- it
+# rewrites that file on exit -- so only the theme files are exposed, per file,
+# and the config itself is left to btop. panama-theme-apps edits the single
+# color_theme line in place.
+BTOP_THEME_DIR="${XDG_CONFIG_HOME:-$HOME/.config}/btop/themes"
+mkdir -p "$BTOP_THEME_DIR"
+for btop_theme_src in "$PANAMA_DOT"/btop/themes/*.theme; do
+  [ -e "$btop_theme_src" ] || continue
+  btop_theme_dst="$BTOP_THEME_DIR/$(basename "$btop_theme_src")"
+  if [ -L "$btop_theme_dst" ]; then
+    rm "$btop_theme_dst"
+  fi
+  if [ -e "$btop_theme_dst" ]; then
+    log "Keeping existing btop theme at $btop_theme_dst"
+  else
+    ln -s "$btop_theme_src" "$btop_theme_dst"
+    log "Linked btop theme → $btop_theme_dst"
+  fi
+done
+
 # GTK3 has no include mechanism, so its settings.ini is generated whole from a
 # template rather than layered. Without this, a fresh checkout has a template
 # and no settings.ini, and GTK3 applications fall back to their built-in theme.