// KDL config parsing for monolithic cce server
  
 use serde::Deserialize;
 use std::collections::HashMap;
 use std::fs;
 use crate::tiling::TilingMode;
 
 #[derive(Debug, Clone)]
 pub struct Layout {
     pub gap: i32,           // inter-window spacing
     pub gap_top: i32,       // screen edge inset, top (above bar)
     pub gap_left: i32,      // screen edge inset, left
     pub gap_right: i32,     // screen edge inset, right
     pub gap_bottom: i32,    // screen edge inset, bottom
     pub cascade_offset: i32,
     pub bar_height: i32,
     pub border_width: i32,
     pub fullscreen_border_width: i32,
     pub cascade_border_width: i32,
     pub grid_border_width: i32,
     pub floating_border_width: i32,
     /// Premultiplied-alpha RGBA, 0.0–1.0 per channel (scenefx convention).
     pub border_color: [f32; 4],
     /// Border color for the focused window; defaults to `border_color`.
     pub border_color_focused: [f32; 4],
     /// Border color while the pointer hovers the border (the grab surface);
     /// defaults to a lightened `border_color_focused`.
     pub border_color_hover: [f32; 4],
     /// Visual gap between the 8 border zone segments.
     pub border_segment_gap: i32,
     /// How thin the resize-handle ring gets at the corners, as a fraction of
     /// its thickness at the middle of a side. 1.0 is an even ring; smaller
     /// values swell the middle of each side, like a picture-frame moulding.
     pub border_taper: f32,
     /// Thickness of the resize-handle ring at the middle of a side, in SCREEN
     /// px. Deliberately its own knob rather than derived from `width`: the
     /// ring has to be thick enough to see and hit while the desktop is zoomed
     /// out, and the window's visible border is a much finer line than that.
     pub border_handle_width: f32,
     /// Opacity a Floating window is dimmed to while it overlaps the window
     /// whose resize handles are up (adjust mode), 0..1. 1.0 disables.
     pub border_overlap_opacity: f32,
     /// How long a window or overlay dissolves in when it maps, in ms. 0
     /// disables the open fade and windows appear at full strength.
     pub fade_in_ms: u32,
     /// How long a client that asked to close dissolves out over, in ms. This
     /// is also the deadline the client waits on before it exits, so it is
     /// answered back over the control socket rather than assumed — see the
     /// `fade-out` command. 0 disables the close fade.
     pub fade_out_ms: u32,
     /// Shape of the handle ring's swell along a side. Below 1 the ring gains
     /// its thickness early — a corner that visibly swells, then a long slow
     /// approach to the middle. Above 1 stays thin near the corner and gains
     /// late. 1.0 is the plain eased ramp.
     pub border_swell_curve: f32,
     /// Radius of the round pad on each corner of the handle ring, in screen
     /// px. 0 disables the pads and leaves the plain moulding.
     pub border_corner_bulge: f32,
     /// Corner zone length measured from the outer corner along each band;
     /// 0 = auto (max(2 * width, 16)).
     pub border_corner_length: i32,
     pub background_r: u32,
     pub background_g: u32,
     pub background_b: u32,
     pub background_a: u32,
     pub border_font_size: i32,
     pub transition_duration: i32,
     pub grid_gap: i32,
     pub border_blur: bool,
     pub window_blur: bool,
     /// THE window corner radius, logical px before span widening —
     /// `style.surface.plate.root.corner_radius`, the same key cce-ui's
     /// root plates and `window_corner_radius` read. Every rounded thing a
     /// window has derives from it (`Window::root_plate_radius_base`): the
     /// content clip, the root plate, the border ring, frame and corner
     /// discs, and the desktop grid's cells (`background_spec`), so a tiled
     /// window's arc sits on its cell's. There is no second radius: the
     /// border's own `corner_radius` key was dead config and was removed
     /// on 2026-09-28.
     pub root_plate_corner_radius: i32,
     pub overlay_behavior: String,
     pub overlay_width: i32,
     pub overlay_position: String,
     pub overlay_border_gap: i32,
     pub status_normal_color: String,
     pub status_background_blur: f32,
     pub desktop_gap_color: String,
     pub transparency_opacity: f32,
     pub window_opacity: bool,
     pub desktop_cell_color: [f32; 4],
     /// Desktop grid cell width/height in virtual units (each axis's period
     /// is cell + gap). Config: `grid_cell_width` / `grid_cell_height`, with
     /// the legacy `grid_cell_size` setting both.
     pub desktop_cell_width: f64,
     pub desktop_cell_height: f64,
     pub desktop_gap_width: i32,
     /// Grid-line lip width in logical px; None = follow the DE-wide relief
     /// material (bevel_thickness clamped to the rail), 0 = no lip.
     pub desktop_line_relief: Option<f64>,
     pub desktop_cell_fade_inset: i64,
     pub desktop_grid_fade_mode: String,
     /// Chess-style coordinates on the desktop squares while overview is
     /// open. KDL: `surface { desktop cell_labels=(bool)false }`.
     pub desktop_cell_labels: bool,
     /// Drop shadow under cce/ssd windows (scenefx box-shadow node).
     pub shadow_enabled: bool,
     /// Gaussian spread in logical px.
     pub shadow_sigma: f32,
     /// Premultiplied-alpha RGBA, like `border_color`.
     pub shadow_color: [f32; 4],
     /// Displacement of the cast shadow in logical px — should point away from
     /// `light_source_position` (down-right for the default top-left light).
     pub shadow_offset_x: i32,
     pub shadow_offset_y: i32,
     /// Whether tiled (and maximized — an alias of Tiled) windows cast the
     /// shadow at all. Off leaves shadows to floating windows only, so a
     /// tiled layout reads as a flat sheet with no smearing across cell gaps.
     pub shadow_tiled: bool,
     /// Edge bevel: a lit chamfer drawn around the INSIDE of a decorated
     /// window's edge (scenefx bevel node), lit from `bevel_light_*` — the
     /// same top-left source the drop shadow is offset away from.
     pub bevel_enabled: bool,
     /// Rim width in logical px.
     pub bevel_thickness: f32,
     /// Direction toward the light; y is down, so the default is up-left.
     pub bevel_light_x: f32,
     pub bevel_light_y: f32,
     /// Strength of the lit and shaded sides, 0..1.
     pub bevel_light_intensity: f32,
     pub bevel_shade_intensity: f32,
     /// 0 = hard flat chamfer, 1 = fully rounded shoulder.
     pub bevel_shoulder: f32,
     /// Highlight tint, premultiplied RGBA; alpha scales the whole effect.
     pub bevel_color: [f32; 4],
     /// Focused-window rim accent: the bevel highlight wraps all four sides
     /// in this color for the focused window (the DE focus glint).
     pub bevel_focus_color: [f32; 3],
     /// How sharply the focused rim's glint falls off across the bevel:
     /// the exponent on the rim slope. 1 is a linear ramp over the whole
     /// thickness (reads as a wash); higher concentrates the light at the
     /// silhouette, at some cost in peak brightness, since the outermost
     /// rendered sample is already below 1.0. Past ~12 it only dims.
     pub bevel_focus_sharpness: f32,
     /// Magnetic grid snap for interactive move/resize.
     pub desktop_snap: bool,
     /// Speed ramp + duration (ms) for the overview enter/exit transition.
     /// `None` (no/invalid `desktop { overview_ramp= }`) falls back to the
     /// exponential-approach camera animation.
     pub overview_anim: Option<(crate::policy::ramp::SpeedRamp, f64)>,
     /// Snap radius in virtual units.
     pub desktop_snap_threshold: f64,
     /// Edge auto-pan: dragging/resizing against a screen edge scrolls the
     /// desktop underneath the pinned cursor.
     pub desktop_edge_pan: bool,
     /// Width of the trigger band inside each output edge, in layout px.
     pub desktop_edge_pan_band: f64,
     /// Full-tilt pan speed at the screen edge, in screen px/s (the tick
     /// divides by zoom; speed ramps linearly across the band).
     pub desktop_edge_pan_speed: f64,
     pub scenefx_optimized_blur: bool,
     pub status_backdrop_blur_ignore_transparent: bool,
     pub window_backdrop_blur_ignore_transparent: bool,
     pub status_module_hide_mode_preview: i64,
     /// Gap between adjacent status segments; the bar's own config file
     /// (`~/.config/cce/cce-status-interface/config.kdl`, `module { spacing }`)
     /// overrides the shared `style { status module_spacing }`.
     pub status_module_spacing: i64,
     /// The bar's `module { droplet }` spec string when present — the water-
     /// drop module style. The compositor drives a scenefx droplet node
     /// (backdrop refraction) per status segment from the SAME spec the bar
     /// draws its drops from, so the two silhouettes cannot drift.
     pub status_droplet: Option<String>,
     /// Backdrop compression for status segments, from the bar's
     /// `module { backdrop_compress }` (the minimum WCAG contrast ratio the
     /// module text must hold against any backdrop pixel) and its
     /// `module { text_color }`: `(ceil, knee, invert)` in linear luminance,
     /// see `backdrop_compress_params`. `None` = off.
     pub status_backdrop_compress: Option<(f32, f32, bool)>,
     pub cloud_position_default: Option<[i32; 2]>,
 }
 
 impl Layout {
     /// The desktop background as the policy crate's declarative spec. The
     /// desktop is always the grid; per-frame geometry comes from
     /// `policy::background::grid_frame`.
     pub fn background_spec(&self) -> crate::policy::api::BackgroundSpec {
         use crate::policy::api::{BackgroundSpec, GridFadeMode, GridSpec, Rgba};
         BackgroundSpec::Grid(GridSpec {
             gap_color: Rgba(parse_hex_color_rgba(&self.desktop_gap_color)),
             cell_color: Rgba(self.desktop_cell_color),
             cell_w: self.desktop_cell_width,
             cell_h: self.desktop_cell_height,
             gap_width: self.desktop_gap_width as f64,
             // Cells inherit the window root plate radius: a tiled window's
             // content covers exactly the visible cell box, so its arc sits
             // precisely on the cell's arc underneath.
             cell_corner_radius: self.root_plate_corner_radius,
             cell_fade_inset: self.desktop_cell_fade_inset as i32,
             fade_mode: GridFadeMode::from_name(&self.desktop_grid_fade_mode),
         })
     }
 
     /// Snap parameters for interactive ops. A zero threshold (snap
     /// disabled) makes every snap function a no-op.
     pub fn snap_params(&self) -> crate::policy::snap::SnapParams {
         crate::policy::snap::SnapParams {
             cell_w: self.desktop_cell_width,
             cell_h: self.desktop_cell_height,
             gap_width: self.desktop_gap_width as f64,
             cell_inset: self.desktop_cell_fade_inset as f64,
             threshold: if self.desktop_snap { self.desktop_snap_threshold } else { 0.0 },
         }
     }
 }
 
 impl Default for Layout {
     fn default() -> Self {
         Layout {
             gap: 48,
             gap_top: 48,
             gap_left: 48,
             gap_right: 48,
             gap_bottom: 48,
             cascade_offset: 20,
             bar_height: 24,
             border_width: 0,
             fullscreen_border_width: 0,
             cascade_border_width: 0,
             grid_border_width: 0,
             floating_border_width: 0,
             border_color: [62.0 / 255.0, 62.0 / 255.0, 62.0 / 255.0, 1.0],
             border_color_focused: [62.0 / 255.0, 62.0 / 255.0, 62.0 / 255.0, 1.0],
             border_color_hover: lighten_premultiplied([62.0 / 255.0, 62.0 / 255.0, 62.0 / 255.0, 1.0], HOVER_LIGHTEN),
             border_segment_gap: 4,
             border_taper: 0.35,
             border_handle_width: 32.0,
             border_overlap_opacity: 0.4,
             fade_in_ms: 140,
             fade_out_ms: 120,
             border_swell_curve: 0.45,
             border_corner_bulge: 48.0,
             border_corner_length: 0,
             background_r: 0x1C1C1C1Cu32,
             background_g: 0x20202020u32,
             background_b: 0x20202020u32,
             background_a: 0xFFFFFFFFu32,
             border_font_size: 11,
             transition_duration: 300,
             grid_gap: 18,
             border_blur: false,
             window_blur: false,
             root_plate_corner_radius: 12,
             overlay_behavior: "inline".to_string(),
             overlay_width: 360,
             overlay_position: "left".to_string(),
             overlay_border_gap: 0,
             status_normal_color: "#ccccd8".to_string(),
             status_background_blur: 0.8,
             desktop_gap_color: "#000000".to_string(),
             transparency_opacity: 0.9,
             window_opacity: true,
             desktop_cell_color: [0.05, 0.05, 0.05, 0.05],
             desktop_cell_width: 100.0,
             desktop_cell_height: 100.0,
             desktop_gap_width: 1,
             desktop_line_relief: None,
             desktop_cell_fade_inset: 0,
             desktop_grid_fade_mode: "linear".to_string(),
             desktop_cell_labels: true,
             bevel_enabled: true,
             bevel_thickness: 10.0,
             bevel_light_x: -0.7071,
             bevel_light_y: -0.7071,
             bevel_light_intensity: 0.6,
             bevel_shade_intensity: 0.5,
             bevel_shoulder: 0.55,
             bevel_color: [1.0, 1.0, 1.0, 1.0],
             bevel_focus_color: [0.35, 0.78, 0.78],
             bevel_focus_sharpness: 3.0,
             shadow_enabled: true,
             shadow_sigma: 22.0,
             shadow_color: [0.0, 0.0, 0.0, 0.55],
             shadow_offset_x: 7,
             shadow_offset_y: 7,
             shadow_tiled: true,
             desktop_snap: true,
             overview_anim: None,
             desktop_snap_threshold: 24.0,
             desktop_edge_pan: true,
             desktop_edge_pan_band: 32.0,
             desktop_edge_pan_speed: 1000.0,
             scenefx_optimized_blur: true,
             status_backdrop_blur_ignore_transparent: true,
             window_backdrop_blur_ignore_transparent: true,
             status_module_hide_mode_preview: 4,
             status_module_spacing: 12,
             status_droplet: None,
             status_backdrop_compress: None,
             cloud_position_default: None,
         }
     }
 }
 
 #[derive(Debug, Clone)]
 pub struct ModeRule {
     pub mode: TilingMode,
     pub app_id_pattern: String,
     pub title_pattern: Option<String>,
     pub single_instance: bool,
     pub tag: i32,
     pub circular: bool,
     pub ssd: Option<bool>,
     /// The window is a satellite of its app's main window (a settings
     /// window opened as a parentless toplevel): it is never restored from
     /// saved state, sizes itself, and maps centred over a mapped sibling of
     /// the same app_id. See `Window::try_center_on_sibling`.
     pub over_sibling: bool,
     /// The window opens centred on the current view, whatever position is
     /// remembered for it: a prompt the user has to answer now (1Password's
     /// authorization popup). Placement only — the remembered size still
     /// applies, and a self-sizing window is re-centred once its real size
     /// lands. See `Window::try_center_on_view`.
     pub center: bool,
 }
 
 pub use cce_window_manager::api::Action;
 
 #[derive(Debug, Deserialize, Clone)]
 pub struct KeybindConfig {
     pub mods: String,
     pub key: String,
     pub action: String,
     pub command: Option<String>,
 }
 
 #[derive(Debug, Deserialize, Clone)]
 pub struct PointerBindConfig {
     pub mods: String,
     pub button: String,
     pub action: String,
 }
 
 #[derive(Debug, Deserialize, Clone)]
 pub struct GestureBindConfig {
     #[serde(default)]
     pub mods: Option<String>,
     #[serde(rename = "type")]
     pub gesture_type: String,
     pub fingers: u32,
     pub direction: String,
     pub action: String,
     pub command: Option<String>,
 }
 
 #[derive(Debug, Deserialize, Clone, PartialEq, Eq)]
 pub struct StartupConfig {
     pub exec: String,
     #[serde(default)]
     pub once: bool,
     #[serde(default)]
     pub restart: bool,
 }
 
 // The compositor's resolved keybind is the policy crate's `Binding`
 // (mods, keysym, action, command), kept under its historical name here.
 pub use cce_window_manager::bindings::Binding as Keybind;
 
 #[derive(Debug, Clone, PartialEq, Eq)]
 pub struct PointerBind {
     pub mods: u32,
     pub button: u32,
     pub action: Action,
 }
 
 #[derive(Debug, Clone, PartialEq, Eq)]
 pub struct GestureBind {
     pub mods: u32,
     pub gesture_type: String,
     pub fingers: u32,
     pub direction: String,
     pub action: Action,
     pub command: Option<String>,
 }
 
 #[derive(Debug, Deserialize, Clone)]
 pub struct OutputConfig {
     #[serde(default = "default_scenefx_optimized_blur")]
     pub scenefx_optimized_blur: bool,
 }
 
 fn default_scenefx_optimized_blur() -> bool {
     true
 }
 
 #[derive(Debug, Deserialize, Clone)]
 pub struct InputDeviceConfigRule {
     pub name: String,
     pub scroll_factor: Option<f64>,
 }
 
 #[derive(Debug, Deserialize, Clone)]
 pub struct WindowManagerConfig {
     pub close_window: Option<String>,
     pub toggle_fullscreen: Option<String>,
     pub toggle_overview: Option<String>,
     pub window_switcher: Option<String>,
     pub window_switcher_prev: Option<String>,
     /// Whether a newly spawned window pulls the viewport over to it. `None` = the default,
     /// which is to centre (what the compositor has always done).
     pub center_on_spawn: Option<bool>,
     /// Camera reaction when the focused window goes away (app exit, close,
     /// minimize): "focus_previous" (pan to the fallback focus — the historic
     /// behavior), "overview", or "none". Menu-typed in config.kdl so the
     /// settings tree renders a dropdown.
     pub on_app_exit: Option<String>,
     /// Corner-shape exponent for scenefx's rounded-corner cuts (window
     /// surfaces, blur, shadows' clip): 2 = circular arc, > 2 = superellipse
     /// squircle. The same `window_manager.corner_shape` key the cce-ui
     /// clients read, so the compositor's cut lands on the corners they draw.
     pub corner_shape: Option<f64>,
     /// Extra app_ids (beyond cce-* apps and SSD requesters) that get the full
     /// decorated-window treatment: rounded corner clip, blur-behind, shadow.
     /// KDL: `rounded_apps "*claude*" "org.example.App"`.
     ///
     /// Entries are matched case-insensitively by `app_id_matches`, and one
     /// containing `*` is a glob. Prefer a glob for anything third-party: an
     /// app_id is not a stable identifier, and an exact entry that stops
     /// matching after a rename takes the corners, blur, shadow and bevel with
     /// it in silence. `ccectl windows` reports the outcome as `decorated=`.
     pub rounded_apps: Option<Vec<String>>,
     /// Which apps the compositor draws an edge BEVEL on. Separate from
     /// `rounded_apps` because drawing one is only right for apps that do not
     /// bevel themselves — every cce-ui app already draws its own, so beveling
     /// them compositor-side doubles the rim. Unset falls back to
     /// `rounded_apps` (never the implicit cce-* set).
     /// KDL: `bevel_apps "*claude*"`. Globbed like `rounded_apps`; reported by
     /// `ccectl windows` as `beveled=`.
     pub bevel_apps: Option<Vec<String>>,
     /// Present Xwayland with a PHYSICAL-pixel screen (the xdg-output global is
     /// hidden from it, so it sizes its root from the wl_output mode) and draw
     /// X11 surfaces at 1/scale, so HiDPI-aware X11 apps render sharp instead
     /// of being upscaled from logical size. Default on. KDL:
     /// `xwayland_hidpi (bool)false` to get the old blurry-but-1:1 behaviour.
     pub xwayland_hidpi: Option<bool>,
     /// Per-app exception to `xwayland_hidpi`: windows matching one of these
     /// patterns are configured and drawn in the logical world (factor 1)
     /// while every other X11 window stays physical. Meant for games and other
     /// X11 clients that size themselves to the whole screen and would render
     /// scale² times the pixels for nothing. A pattern is tried against the
     /// window's WM_CLASS class, its WM_CLASS instance and its title, since
     /// every Proton window shares the class `steam_proton`; `*` wildcards as
     /// in `rounded_apps`. KDL: `xwayland_hidpi_except "Trackmania"`.
     ///
     /// A named window is treated as the full-screen X11 game it is
     /// (`xwayland_window::window_is_hidpi_exempt`): it is drawn at 1 in the
     /// logical world, it is NOT restored to a saved size at map (it sizes
     /// itself to the screen — a restored 1214x689 is what Trackmania then
     /// pinned in its hints), its own position requests are granted (its
     /// "windowedfull" asks for the desktop origin, and refusing that was a
     /// ~170/s configure loop), and only a compositor fullscreen or tiling
     /// overrides its size.
     pub xwayland_hidpi_except: Option<Vec<String>>,
     /// Apps whose windows turn trackpad input into a view drag (Space +
     /// button) — see `cursor::ViewDrag`. A scroll over one of their popups
     /// becomes a wheel under a held Ctrl instead — see `cursor::PopupWheel`.
     /// KDL: `touchpad_view_apps "Houdini FX"`.
     pub touchpad_view_apps: Option<Vec<String>>,
     /// What an unmodified two-finger swipe does there: "pan" (default) or
     /// "tumble"; Shift does the other. KDL: `touchpad_view_swipe "tumble"`.
     pub touchpad_view_swipe: Option<String>,
     /// Finger-to-pointer distance factor for the emulated drag (default 1).
     pub touchpad_view_sensitivity: Option<f64>,
     /// How far the desktop leans toward a directional swipe bind by the
     /// time the swipe reaches its threshold, screen px (default 60; 0
     /// turns the lean off). KDL: `swipe_peek (f64)60.0`. Lives here, not
     /// under `input`, because input.kdl's `input {}` block replaces
     /// config.kdl's wholesale. See "Swipe binds peek" in CLAUDE.md.
     pub swipe_peek: Option<f64>,
     /// The lean toward each FURTHER step of a swipe that has already
     /// switched focus, screen px at `swipe_repeat_threshold` (default half
     /// of `swipe_peek`; 0 turns it off). Slower than the first step's
     /// lean, so a swipe that has just switched reads as settled. KDL:
     /// `swipe_repeat_peek (f64)30.0`.
     pub swipe_repeat_peek: Option<f64>,
     /// How far off the swipe's own direction (degrees) a window center may
     /// lie and still take focus from a three-finger focus swipe (default
     /// 45; clamped to 1-89). A swipe toward nothing within it changes
     /// nothing. KDL: `swipe_focus_cone (f64)45.0`.
     pub swipe_focus_cone: Option<f64>,
     /// Accumulated travel (libinput units, roughly mm) at which a swipe
     /// bind fires (default 70). KDL: `swipe_threshold (f64)70.0`.
     pub swipe_threshold: Option<f64>,
     /// Travel each further fire of the same swipe needs after its first
     /// (default four times `swipe_threshold`), so a swipe that has just
     /// stepped focus meets more resistance before stepping again. KDL:
     /// `swipe_repeat_threshold (f64)280.0`.
     pub swipe_repeat_threshold: Option<f64>,
     /// Reverse the drag direction, on top of the natural-scroll correction
     /// the drag already makes. KDL: `touchpad_view_invert (bool)true`.
     pub touchpad_view_invert: Option<bool>,
     /// Apps whose native widgets scroll sideways only under Shift and read a
     /// horizontal wheel as a vertical one (Houdini's spreadsheet, list and
     /// parameter panes): a horizontal two-finger scroll over their windows is
     /// delivered as a vertical scroll with Shift held for the gesture. KDL:
     /// `touchpad_hscroll_shift_apps "Houdini FX"`.
     pub touchpad_hscroll_shift_apps: Option<Vec<String>>,
     /// Show the on-screen keyboard when a touch activates a text field, and
     /// hide it when the field lets go (`osk.rs`). Default on. KDL:
     /// `osk_on_touch (bool)false`.
     pub osk_on_touch: Option<bool>,
 }
 
 #[derive(Debug, Deserialize, Clone, Default, PartialEq, Eq)]
 pub struct GesturesConfig {
     pub swipe: Option<bool>,
     pub pinch: Option<bool>,
 }
 
 #[derive(Debug, Deserialize, Clone, Default, PartialEq)]
 pub struct TouchpadConfig {
     pub tap_to_click: Option<bool>,
     pub natural_scroll: Option<bool>,
     pub dwt: Option<bool>,
     pub dwtp: Option<bool>,
     pub gestures: Option<GesturesConfig>,
     pub accel_speed: Option<f64>,
     pub accel_profile: Option<String>,
     pub scroll_factor: Option<f64>,
 }
 
 #[derive(Debug, Deserialize, Clone, Default, PartialEq)]
 pub struct TrackpointConfig {
     pub accel_speed: Option<f64>,
     pub accel_profile: Option<String>,
     pub scroll_factor: Option<f64>,
     /// libinput scroll method: `"none"`, `"button"` (scroll while the
     /// middle button is held) or `"two_finger"` / `"edge"` for devices that
     /// support them. libinput defaults a pointing stick to `"button"`, which
     /// withholds every middle press until the release to see whether it was
     /// a scroll: clients then get a press and release in the same instant,
     /// so a middle *click* never registers and a middle *drag* scrolls.
     pub scroll_method: Option<String>,
 }
 
 #[derive(Debug, Deserialize, Clone, Default, PartialEq)]
 pub struct MouseConfig {
     pub accel_speed: Option<f64>,
     pub accel_profile: Option<String>,
     pub scroll_factor: Option<f64>,
     /// See `TrackpointConfig::scroll_method`.
     pub scroll_method: Option<String>,
 }
 
 /// Pointer device configuration. Per-class blocks (`mouse` / `touchpad` /
 /// `trackpad` alias / `trackpoint`) override the top-level values for
 /// devices of that class; a device is a trackpoint if its name says so, a
 /// touchpad if it supports tap, and a mouse otherwise.
 #[derive(Debug, Deserialize, Clone, Default)]
 pub struct InputConfig {
     pub accel_speed: Option<f64>,
     pub accel_profile: Option<String>,
     pub scroll_factor: Option<f64>,
     /// Desktop-pan smooth scrolling (the compositor's own consumption of the
     /// wheel: background/overview/super pans and ctrl+super zoom). Same keys
     /// and defaults as cce-ui's `widget::scroll_motion`, so a wheel notch
     /// glides the same way over a list and over the desktop.
     /// `scroll_ease`: wheel-glide rate, 1/s (default 12).
     pub scroll_ease: Option<f64>,
     /// `kinetic_scroll`: a trackpad flick keeps panning after the lift (default true).
     pub kinetic_scroll: Option<bool>,
     /// `scroll_friction`: coast decay, 1/s (default 6).
     pub scroll_friction: Option<f64>,
     /// `repeat_rate`: key repeats per second once repeating starts
     /// (default `keyboard::DEFAULT_REPEAT_RATE`; 0 disables repeat).
     pub repeat_rate: Option<i64>,
     /// `repeat_delay`: ms a key is held before it starts repeating
     /// (default `keyboard::DEFAULT_REPEAT_DELAY`).
     pub repeat_delay: Option<i64>,
     pub mouse: Option<MouseConfig>,
     pub touchpad: Option<TouchpadConfig>,
     pub trackpoint: Option<TrackpointConfig>,
 }
 
 impl InputConfig {
     /// `(rate, delay)` for hardware keyboards, defaults filled in. Negative
     /// values are clamped to 0, which `wl_keyboard.repeat_info` reads as
     /// "no repeat" for the rate; the protocol rejects negatives outright.
     pub fn repeat_info(&self) -> (i32, i32) {
         let rate = self.repeat_rate.map_or(crate::keyboard::DEFAULT_REPEAT_RATE, |v| v.clamp(0, i32::MAX as i64) as i32);
         let delay = self.repeat_delay.map_or(crate::keyboard::DEFAULT_REPEAT_DELAY, |v| v.clamp(0, i32::MAX as i64) as i32);
         (rate, delay)
     }
 }
 
 #[derive(Debug, Deserialize, Clone, Default)]
 pub struct TransparencyConfig {
     pub opacity: Option<f64>,
 }
 
 #[derive(Debug, Deserialize, Clone)]
 pub struct SurfaceConfig {
     #[serde(default = "default_desktop_gap_color")]
     pub desktop_gap_color: String,
     #[serde(default = "default_desktop_cell_color")]
     pub desktop_cell_color: String,
     #[serde(default = "default_desktop_grid_scale")]
     pub desktop_grid_scale: i64,
     /// Per-axis cell sizes; None falls back to `desktop_grid_scale`
     /// (the legacy square `grid_cell_size`).
     #[serde(default)]
     pub grid_cell_width: Option<i64>,
     #[serde(default)]
     pub grid_cell_height: Option<i64>,
     #[serde(default = "default_desktop_gap_width")]
     pub desktop_gap_width: i64,
     /// Negative = unset (follow the DE-wide relief material).
     #[serde(default = "default_desktop_line_relief")]
     pub desktop_line_relief: i64,
     #[serde(default = "default_desktop_cell_fade_inset")]
     pub desktop_cell_fade_inset: i64,
     #[serde(default = "default_desktop_grid_fade_mode")]
     pub desktop_grid_fade_mode: String,
     #[serde(default = "default_desktop_cell_labels")]
     pub desktop_cell_labels: bool,
     #[serde(default = "default_desktop_snap")]
     pub desktop_snap: bool,
     #[serde(default)]
     pub desktop_overview_ramp: String,
     #[serde(default = "default_desktop_overview_ms")]
     pub desktop_overview_ms: i64,
     #[serde(default = "default_desktop_snap_threshold")]
     pub desktop_snap_threshold: i64,
     #[serde(default = "default_desktop_edge_pan")]
     pub desktop_edge_pan: bool,
     #[serde(default = "default_desktop_edge_pan_band")]
     pub desktop_edge_pan_band: i64,
     #[serde(default = "default_desktop_edge_pan_speed")]
     pub desktop_edge_pan_speed: i64,
     #[serde(default = "default_root_plate_color")]
     pub root_plate_color: String,
     #[serde(default = "default_root_plate_blur")]
     pub root_plate_blur: f64,
     #[serde(default = "default_root_plate_corner_radius")]
     pub root_plate_corner_radius: i64,
     #[serde(default = "default_border_width")]
     pub border_width: i64,
     #[serde(default = "default_border_color")]
     pub border_color: String,
     /// `None` falls back to `border_color`.
     #[serde(default)]
     pub border_color_focused: Option<String>,
     /// `None` falls back to a lightened `border_color_focused`.
     #[serde(default)]
     pub border_color_hover: Option<String>,
     #[serde(default = "default_border_segment_gap")]
     pub border_segment_gap: i64,
     #[serde(default = "default_border_taper")]
     pub border_taper: f64,
     #[serde(default = "default_border_handle_width")]
     pub border_handle_width: f64,
     #[serde(default = "default_border_overlap_opacity")]
     pub border_overlap_opacity: f64,
     /// `surface { fade in_ms=.. out_ms=.. }` — the DE-wide open/close
     /// dissolve. Milliseconds; 0 on either disables that direction.
     #[serde(default = "default_fade_in_ms")]
     pub fade_in_ms: i64,
     #[serde(default = "default_fade_out_ms")]
     pub fade_out_ms: i64,
     #[serde(default = "default_border_swell_curve")]
     pub border_swell_curve: f64,
     #[serde(default = "default_border_corner_bulge")]
     pub border_corner_bulge: f64,
     /// 0 = auto (max(2 * width, 16)).
     #[serde(default)]
     pub border_corner_length: i64,
     #[serde(default = "default_cloud_position_default")]
     pub cloud_position_default: Option<[i32; 2]>,
     #[serde(default = "default_shadow_enabled")]
     pub shadow_enabled: bool,
     #[serde(default = "default_shadow_sigma")]
     pub shadow_sigma: f64,
     #[serde(default = "default_shadow_color")]
     pub shadow_color: String,
     #[serde(default = "default_shadow_offset_x")]
     pub shadow_offset_x: i64,
     #[serde(default = "default_shadow_offset_y")]
     pub shadow_offset_y: i64,
     #[serde(default = "default_shadow_tiled")]
     pub shadow_tiled: bool,
     #[serde(default = "default_bevel_enabled")]
     pub bevel_enabled: bool,
     #[serde(default = "default_bevel_thickness")]
     pub bevel_thickness: f64,
     #[serde(default = "default_bevel_light")]
     pub bevel_light: String,
     #[serde(default = "default_bevel_light_intensity")]
     pub bevel_light_intensity: f64,
     #[serde(default = "default_bevel_shade_intensity")]
     pub bevel_shade_intensity: f64,
     #[serde(default = "default_bevel_shoulder")]
     pub bevel_shoulder: f64,
     #[serde(default = "default_bevel_color")]
     pub bevel_color: String,
     #[serde(default = "default_bevel_focus_color")]
     pub bevel_focus_color: String,
     #[serde(default = "default_bevel_focus_sharpness")]
     pub bevel_focus_sharpness: f64,
 }
 
 fn default_shadow_enabled() -> bool { true }
 fn default_shadow_sigma() -> f64 { 22.0 }
 fn default_shadow_color() -> String { "#0000008c".to_string() }
 fn default_shadow_offset_x() -> i64 { 7 }
 fn default_shadow_offset_y() -> i64 { 7 }
 fn default_shadow_tiled() -> bool { true }
 fn default_bevel_enabled() -> bool { true }
 fn default_bevel_thickness() -> f64 { 10.0 }
 /// Compass point the light comes FROM, matching the shadow's top-left source.
 fn default_bevel_light() -> String { "top-left".to_string() }
 fn default_bevel_light_intensity() -> f64 { 0.6 }
 fn default_bevel_shade_intensity() -> f64 { 0.5 }
 fn default_bevel_shoulder() -> f64 { 0.55 }
 fn default_bevel_color() -> String { "#ffffffff".to_string() }
 fn default_bevel_focus_color() -> String { "#59c7c7".to_string() }
 fn default_bevel_focus_sharpness() -> f64 { 3.0 }
 
 /// Map a compass point to a unit vector pointing TOWARD the light, in screen
 /// space (y down). Anything unrecognized keeps the DE's top-left default.
 pub fn parse_light_direction(s: &str) -> (f32, f32) {
     let d = 0.7071_f32;
     match s.trim().to_ascii_lowercase().replace('_', "-").as_str() {
         "top" | "up" | "north" => (0.0, -1.0),
         "bottom" | "down" | "south" => (0.0, 1.0),
         "left" | "west" => (-1.0, 0.0),
         "right" | "east" => (1.0, 0.0),
         "top-right" | "up-right" | "north-east" => (d, -d),
         "bottom-left" | "down-left" | "south-west" => (-d, d),
         "bottom-right" | "down-right" | "south-east" => (d, d),
         _ => (-d, -d),
     }
 }
 
 impl Default for SurfaceConfig {
     fn default() -> Self {
         Self {
             desktop_gap_color: default_desktop_gap_color(),
             desktop_cell_color: default_desktop_cell_color(),
             desktop_grid_scale: default_desktop_grid_scale(),
             grid_cell_width: None,
             grid_cell_height: None,
             desktop_gap_width: default_desktop_gap_width(),
             desktop_line_relief: default_desktop_line_relief(),
             desktop_cell_fade_inset: default_desktop_cell_fade_inset(),
             desktop_grid_fade_mode: default_desktop_grid_fade_mode(),
             desktop_cell_labels: default_desktop_cell_labels(),
             desktop_snap: default_desktop_snap(),
             desktop_overview_ramp: String::new(),
             desktop_overview_ms: default_desktop_overview_ms(),
             desktop_snap_threshold: default_desktop_snap_threshold(),
             desktop_edge_pan: default_desktop_edge_pan(),
             desktop_edge_pan_band: default_desktop_edge_pan_band(),
             desktop_edge_pan_speed: default_desktop_edge_pan_speed(),
             root_plate_color: default_root_plate_color(),
             root_plate_blur: default_root_plate_blur(),
             root_plate_corner_radius: default_root_plate_corner_radius(),
             border_width: default_border_width(),
             border_color: default_border_color(),
             border_color_focused: None,
             border_color_hover: None,
             border_segment_gap: default_border_segment_gap(),
             border_taper: default_border_taper(),
             border_handle_width: default_border_handle_width(),
             border_overlap_opacity: default_border_overlap_opacity(),
             fade_in_ms: default_fade_in_ms(),
             fade_out_ms: default_fade_out_ms(),
             border_swell_curve: default_border_swell_curve(),
             border_corner_bulge: default_border_corner_bulge(),
             border_corner_length: 0,
             cloud_position_default: default_cloud_position_default(),
             shadow_enabled: default_shadow_enabled(),
             shadow_sigma: default_shadow_sigma(),
             shadow_color: default_shadow_color(),
             shadow_offset_x: default_shadow_offset_x(),
             shadow_offset_y: default_shadow_offset_y(),
             shadow_tiled: default_shadow_tiled(),
             bevel_enabled: default_bevel_enabled(),
             bevel_thickness: default_bevel_thickness(),
             bevel_light: default_bevel_light(),
             bevel_light_intensity: default_bevel_light_intensity(),
             bevel_shade_intensity: default_bevel_shade_intensity(),
             bevel_shoulder: default_bevel_shoulder(),
             bevel_color: default_bevel_color(),
             bevel_focus_color: default_bevel_focus_color(),
             bevel_focus_sharpness: default_bevel_focus_sharpness(),
         }
      }
 }
 
 fn default_cloud_position_default() -> Option<[i32; 2]> {
     None
 }
 
 fn default_desktop_gap_color() -> String {
 
     "#000000".to_string()
 }
 
 fn default_desktop_cell_color() -> String {
     "#ffffff0d".to_string()
 }
 
 fn default_desktop_grid_scale() -> i64 {
     100
 }
 
 fn default_desktop_gap_width() -> i64 {
     1
 }
 
 fn default_desktop_line_relief() -> i64 {
     -1
 }
 
 fn default_desktop_cell_fade_inset() -> i64 {
     0
 }
 
 fn default_desktop_cell_labels() -> bool {
     true
 }
 
 fn default_desktop_grid_fade_mode() -> String {
     "linear".to_string()
 }
 
 fn default_desktop_overview_ms() -> i64 {
     350
 }
 
 fn default_desktop_snap() -> bool {
     true
 }
 
 fn default_desktop_snap_threshold() -> i64 {
     24
 }
 
 fn default_desktop_edge_pan() -> bool {
     true
 }
 
 fn default_desktop_edge_pan_band() -> i64 {
     32
 }
 
 fn default_desktop_edge_pan_speed() -> i64 {
     1000
 }
 
 fn default_root_plate_color() -> String {
     "#151520e6".to_string()
 }
 
 fn default_root_plate_blur() -> f64 {
     0.8
 }
 
 fn default_root_plate_corner_radius() -> i64 {
     12
 }
 
 fn default_border_width() -> i64 {
     0
 }
 
 fn default_border_color() -> String {
     "#3e3e3e".to_string()
 }
 
 fn default_border_taper() -> f64 { 0.35 }
 fn default_border_handle_width() -> f64 { 32.0 }
 fn default_border_overlap_opacity() -> f64 { 0.4 }
 fn default_fade_in_ms() -> i64 { 140 }
 fn default_fade_out_ms() -> i64 { 120 }
 fn default_border_swell_curve() -> f64 { 0.45 }
 fn default_border_corner_bulge() -> f64 { 48.0 }
 
 fn default_border_segment_gap() -> i64 {
     4
 }
 
 /// How far the default hover color moves toward white.
 const HOVER_LIGHTEN: f32 = 0.35;
 
 /// Mix a premultiplied-alpha color toward white (which is `[a, a, a, a]` in
 /// premultiplied space), keeping the alpha.
 /// Curvature-matched corner-span factor for window-scale squircle corners,
 /// mirroring cce-ui's `layout::corner_span_factor()` exactly: a raw
 /// superellipse of exponent n at a circle's nominal radius turns tighter at
 /// the diagonal, so the corner span is scaled by (n − 1)·2^(1/n)/√2 to make
 /// the diagonal curvature equal the configured radius. The clients widen
 /// their plate corners by this factor, so every compositor-side corner cut
 /// (blur, shadow, surface clip, background rect) must widen the same way or
 /// the cuts land outside the corners the clients draw. Exactly 1 at n = 2.
 /// Written on config load/reload (same place the exponent is pushed into
 /// scenefx), read on the render paths — f64 bits in an atomic, like
 /// scenefx's own global_corner_shape.
 static CORNER_SPAN_FACTOR: std::sync::atomic::AtomicU64 = std::sync::atomic::AtomicU64::new(0x3FF0000000000000); // 1.0f64
 
 pub fn corner_span_factor() -> f64 {
     f64::from_bits(CORNER_SPAN_FACTOR.load(std::sync::atomic::Ordering::Relaxed))
 }
 
 pub fn lighten_premultiplied(c: [f32; 4], t: f32) -> [f32; 4] {
     [
         c[0] + (c[3] - c[0]) * t,
         c[1] + (c[3] - c[1]) * t,
         c[2] + (c[3] - c[2]) * t,
         c[3],
     ]
 }
 
 
 #[derive(Debug, Deserialize)]
 pub struct Config {
     #[serde(default)]
     pub layout: LayoutConfig,
     #[serde(default)]
     pub env: HashMap<String, String>,
     #[serde(default, rename = "key_bindings")]
     pub key_bindings: Vec<KeybindConfig>,
     #[serde(default)]
     pub pointer_bind: Vec<PointerBindConfig>,
     #[serde(default)]
     pub mode_rule: Vec<ModeRuleConfig>,
     #[serde(default)]
     pub tag_layout: Vec<TagLayoutConfig>,
     #[serde(default)]
     pub startup: Vec<StartupConfig>,
     #[serde(default)]
     pub output: Option<OutputConfig>,
     #[serde(default)]
     pub display: HashMap<String, f64>,
     #[serde(default)]
     pub device: Vec<InputDeviceConfigRule>,
     #[serde(default)]
     pub input: Option<InputConfig>,
     #[serde(default)]
     pub gesture_bind: Vec<GestureBindConfig>,
     #[serde(default)]
     pub transparency: Option<TransparencyConfig>,
     #[serde(default)]
     pub surface: SurfaceConfig,
     #[serde(default)]
     pub window_manager: Option<WindowManagerConfig>,
     /// The `idle { }` block: display-off and sleep timeouts (seconds).
     #[serde(skip)]
     pub idle: crate::idle::IdleConfig,
 }
 
 #[derive(Debug, Deserialize)]
 pub struct LayoutConfig {
     #[serde(default = "default_gap")]
     pub gap: i64,
     #[serde(default = "default_gap_top")]
     pub gap_top: i64,
     #[serde(default = "default_gap_left")]
     pub gap_left: i64,
     #[serde(default = "default_gap_right")]
     pub gap_right: i64,
     #[serde(default = "default_gap_bottom")]
     pub gap_bottom: i64,
     #[serde(default = "default_cascade_offset")]
     pub cascade_offset: i64,
     #[serde(default = "default_bar_height")]
     pub bar_height: i64,
     #[serde(default = "default_transition_duration")]
     pub transition_duration: i64,
     #[serde(default = "default_grid_gap")]
     pub grid_gap: i64,
     #[serde(default = "default_window_blur")]
     pub window_blur: bool,
     #[serde(default = "default_overlay_behavior", alias = "pinned_behavior", alias = "side_panel_behavior")]
     pub overlay_behavior: String,
     #[serde(default = "default_overlay_width", alias = "pinned_width", alias = "side_panel_width")]
     pub overlay_width: i64,
     #[serde(default = "default_overlay_position", alias = "pinned_position", alias = "side_panel_position")]
     pub overlay_position: String,
     #[serde(default = "default_overlay_border_gap", alias = "pinned_border_gap", alias = "side_panel_border_gap")]
     pub overlay_border_gap: i64,
     #[serde(default = "default_status_normal_color")]
     pub status_normal_color: String,
     #[serde(default = "default_status_background_blur")]
     pub status_background_blur: f64,
     #[serde(default = "default_window_opacity")]
     pub window_opacity: bool,
     #[serde(default = "default_status_backdrop_blur_ignore_transparent")]
     pub status_backdrop_blur_ignore_transparent: bool,
     #[serde(default = "default_window_backdrop_blur_ignore_transparent")]
     pub window_backdrop_blur_ignore_transparent: bool,
     #[serde(default = "default_status_module_hide_mode_preview")]
     pub status_module_hide_mode_preview: i64,
     #[serde(default = "default_status_module_spacing")]
     pub status_module_spacing: i64,
     /// The bar's `module { droplet }` spec string (presence enables the
     /// droplet style; the compositor's per-segment backdrop-refraction node
     /// reads the same spec the bar draws from).
     #[serde(default)]
     pub status_droplet: Option<String>,
     /// Backdrop compression for status segments, from the bar's
     /// `module { backdrop_compress }` (the minimum WCAG contrast ratio the
     /// module text must hold against any backdrop pixel) and its
     /// `module { text_color }`: `(ceil, knee, invert)` in linear luminance,
     /// see `backdrop_compress_params`. `None` = off.
     #[serde(default)]
     pub status_backdrop_compress: Option<(f32, f32, bool)>,
 }
 
 impl Default for LayoutConfig {
     fn default() -> Self {
         Self {
             gap: default_gap(),
             gap_top: default_gap_top(),
             gap_left: default_gap_left(),
             gap_right: default_gap_right(),
             gap_bottom: default_gap_bottom(),
             cascade_offset: default_cascade_offset(),
             bar_height: default_bar_height(),
             transition_duration: default_transition_duration(),
             grid_gap: default_grid_gap(),
             window_blur: default_window_blur(),
             overlay_behavior: default_overlay_behavior(),
             overlay_width: default_overlay_width(),
             overlay_position: default_overlay_position(),
             overlay_border_gap: default_overlay_border_gap(),
             status_normal_color: default_status_normal_color(),
             status_background_blur: default_status_background_blur(),
             window_opacity: default_window_opacity(),
             status_backdrop_blur_ignore_transparent: default_status_backdrop_blur_ignore_transparent(),
             window_backdrop_blur_ignore_transparent: default_window_backdrop_blur_ignore_transparent(),
             status_module_hide_mode_preview: default_status_module_hide_mode_preview(),
             status_module_spacing: default_status_module_spacing(),
             status_droplet: None,
             status_backdrop_compress: None,
         }
     }
 }
 
 fn default_gap() -> i64 { 48 }
 fn default_gap_top() -> i64 { 48 }
 fn default_gap_left() -> i64 { 48 }
 fn default_gap_right() -> i64 { 48 }
 fn default_gap_bottom() -> i64 { 48 }
 fn default_cascade_offset() -> i64 { 20 }
 fn default_bar_height() -> i64 { 24 }
 fn default_transition_duration() -> i64 { 300 }
 fn default_grid_gap() -> i64 { 18 }
 fn default_window_blur() -> bool { false }
 fn default_overlay_behavior() -> String { "inline".to_string() }
 fn default_overlay_width() -> i64 { 360 }
 fn default_overlay_position() -> String { "left".to_string() }
 fn default_overlay_border_gap() -> i64 { 0 }
 fn default_status_normal_color() -> String { "#ccccd8".to_string() }
 fn default_status_background_blur() -> f64 { 0.8 }
 fn default_window_opacity() -> bool { true }
 fn default_status_backdrop_blur_ignore_transparent() -> bool { true }
 
 fn default_status_module_hide_mode_preview() -> i64 { 4 }
 fn default_status_module_spacing() -> i64 {
     crate::policy::arrange::DEFAULT_STATUS_MODULE_SPACING as i64
 }
 fn default_window_backdrop_blur_ignore_transparent() -> bool { true }
 
 #[derive(Debug, Deserialize)]
 pub struct ModeRuleConfig {
     pub mode: String,
     pub app_id: String,
     pub title: Option<String>,
     pub single: Option<bool>,
     pub tag: Option<i64>,
     pub circular: Option<bool>,
     pub ssd: Option<bool>,
     pub over_sibling: Option<bool>,
     pub center: Option<bool>,
 }
 
 #[derive(Debug, Deserialize)]
 pub struct TagLayoutConfig {
     pub tag: i64,
     pub mode: String,
 }
 
 pub fn parse_hex_color(hex_str: &str) -> u32 {
     let hex = hex_str.trim_matches(|c| c == '"' || c == '\'' || c == ' ');
     let hex = hex.trim_start_matches('#');
     if hex.len() != 6 {
         return 0xFFFFFFFF; // fallback to white
     }
     if let Ok(val) = u32::from_str_radix(hex, 16) {
         val
     } else {
         0xFFFFFFFF
     }
 }
 
 /// Backdrop compression parameters for text of color `text_hex` that must
 /// hold a WCAG contrast `ratio` against every backdrop pixel: `(ceil, knee,
 /// invert)` in linear luminance, as scenefx's `wlr_scene_blur_set_compress`
 /// takes them. Light text caps the backdrop at the brightest luminance that
 /// still gives the ratio; dark text (`invert`) floors it at the darkest, and
 /// the ceiling is then measured in the inverted image (1 - floor). The knee,
 /// where compression starts, sits at half the ceiling, so a backdrop already
 /// dark enough for the text is left exactly as it is. `None` for a ratio of
 /// 1 or less, or an unparseable color.
 ///
 /// The bubble's own translucent fill and droplet lighting composite on top
 /// of the compressed backdrop and lift it, so the ratio reached is well
 /// under the one asked for (droplet style on pure white: 4.5 asked, 2.7
 /// reached; 10 asked, 4.7 reached).
 pub fn backdrop_compress_params(text_hex: &str, ratio: f64) -> Option<(f32, f32, bool)> {
     if !(ratio > 1.0) {
         return None;
     }
     let hex = text_hex.trim_matches(|c| c == '"' || c == '\'' || c == ' ').trim_start_matches('#');
     if hex.len() < 6 {
         return None;
     }
     let lin = |i: usize| -> Option<f64> {
         let c = u8::from_str_radix(hex.get(i..i + 2)?, 16).ok()? as f64 / 255.0;
         Some(if c <= 0.04045 { c / 12.92 } else { ((c + 0.055) / 1.055).powf(2.4) })
     };
     let lt = 0.2126 * lin(0)? + 0.7152 * lin(2)? + 0.0722 * lin(4)?;
     // Which way the text reads: against black or against white.
     let light = (lt + 0.05) / 0.05 >= 1.05 / (lt + 0.05);
     let ceil = if light {
         (lt + 0.05) / ratio - 0.05
     } else {
         1.0 - (ratio * (lt + 0.05) - 0.05)
     };
     // A ratio the text color cannot reach at all still compresses as hard
     // as it sensibly can rather than crushing the backdrop to black.
     let ceil = ceil.clamp(0.005, 1.0) as f32;
     Some((ceil, ceil * 0.5, !light))
 }
 
 pub fn parse_hex_color_rgba(hex_str: &str) -> [f32; 4] {
     let hex = hex_str.trim_matches(|c| c == '"' || c == '\'' || c == ' ');
     let hex = hex.trim_start_matches('#');
     if hex.len() == 8 {
         if let (Ok(r), Ok(g), Ok(b), Ok(a)) = (
             u8::from_str_radix(&hex[0..2], 16),
             u8::from_str_radix(&hex[2..4], 16),
             u8::from_str_radix(&hex[4..6], 16),
             u8::from_str_radix(&hex[6..8], 16),
         ) {
             let alpha = a as f32 / 255.0;
             return [
                 (r as f32 / 255.0) * alpha,
                 (g as f32 / 255.0) * alpha,
                 (b as f32 / 255.0) * alpha,
                 alpha,
             ];
         }
     } else if hex.len() == 6 {
         if let (Ok(r), Ok(g), Ok(b)) = (
             u8::from_str_radix(&hex[0..2], 16),
             u8::from_str_radix(&hex[2..4], 16),
             u8::from_str_radix(&hex[4..6], 16),
         ) {
             return [
                 r as f32 / 255.0,
                 g as f32 / 255.0,
                 b as f32 / 255.0,
                 1.0,
             ];
         }
     }
     [0.05, 0.05, 0.05, 0.05] // fallback default (5% white)
 }
 
 /// Camera reaction when the focused window goes away — see
 /// `WindowManager::focus_next_visible_window`. The fallback focus itself
 /// always transfers (keyboard input needs a live target); this only decides
 /// what the CAMERA does about it.
 #[derive(Debug, Clone, Copy, PartialEq, Eq)]
 pub enum OnAppExit {
     /// Pan to the fallback-focused window (the historic behavior).
     FocusPrevious,
     /// Enter overview instead of chasing any one window.
     Overview,
     /// The camera stays exactly where the user left it.
     Nothing,
 }
 
 pub fn parse_on_app_exit(s: &str) -> OnAppExit {
     match s.to_lowercase().as_str() {
         "focus_previous" => OnAppExit::FocusPrevious,
         "overview" => OnAppExit::Overview,
         _ => OnAppExit::Nothing,
     }
 }
 
 pub fn parse_tiling_mode(s: &str) -> TilingMode {
     match s.to_lowercase().as_str() {
         "fullscreen" => TilingMode::Fullscreen,
         "popup" => TilingMode::Popup,
         "sidepanel" | "side_panel" | "side-panel" | "pinned" | "overlay" => TilingMode::Overlay,
         "status" => TilingMode::Status,
         "utility" => TilingMode::Utility,
         // "maximized" is the retired name for grid-locked windows.
         "tiled" | "maximized" => TilingMode::Tiled,
         // Everything else — including the retired "cascade"/"grid" layout
         // modes still present in old configs — is Floating.
         _ => TilingMode::Floating,
     }
 }
 
 pub fn parse_modifiers(mod_str: &str) -> u32 {
     let mut mods = 0u32;
     if mod_str.contains("super") || mod_str.contains("mod4") {
         mods |= 0x40; // RIVER_SEAT_V1_MODIFIERS_MOD4
     }
     if mod_str.contains("shift") {
         mods |= 0x01; // RIVER_SEAT_V1_MODIFIERS_SHIFT
     }
     if mod_str.contains("ctrl") {
         mods |= 0x04; // RIVER_SEAT_V1_MODIFIERS_CTRL
     }
     if mod_str.contains("alt") || mod_str.contains("mod1") {
         mods |= 0x08; // RIVER_SEAT_V1_MODIFIERS_MOD1
     }
     mods
 }
 
 /// A touchscreen edge-swipe chord: `edge_left`, `edge_right`, `edge_top`
 /// or `edge_bottom` — the edge the finger starts from — optionally behind
 /// modifiers (`super+edge_top`). Returns the modifier mask and the edge.
 /// Kept apart from `cce_window_manager::bindings::parse_gesture`, whose
 /// gestures are the touchpad's and carry a finger count.
 pub fn parse_edge_gesture(chord: &str) -> Option<(u32, String)> {
     let lower = chord.trim().to_lowercase().replace('-', "_");
     let (mods, gesture) = match lower.rsplit_once('+') {
         Some((mods, gesture)) => (parse_modifiers(mods), gesture.trim()),
         None => (0, lower.as_str()),
     };
     let edge = gesture.strip_prefix("edge_")?;
     matches!(edge, "left" | "right" | "top" | "bottom").then(|| (mods, edge.to_string()))
 }
 
 pub fn parse_button(s: &str) -> u32 {
     match s.trim() {
         "left" => 0x110,   // BTN_LEFT
         "right" => 0x111,  // BTN_RIGHT
         "middle" => 0x112, // BTN_MIDDLE
         "side" => 0x113,   // BTN_SIDE
         "extra" => 0x114,  // BTN_EXTRA
         _ => s.trim().parse().unwrap_or(0),
     }
 }
 
 pub fn parse_action(s: &str) -> Action {
     let trimmed = s.trim();
     if trimmed.starts_with("spawn")
         && (trimmed.len() == 5 || trimmed.as_bytes()[5] == b' ' || trimmed.as_bytes()[5] == b'-')
     {
         Action::Spawn
     } else if trimmed == "toggle" {
         Action::Toggle
     } else if trimmed == "move" {
         Action::Move
     } else if trimmed == "resize" {
         Action::Resize
     } else {
         Action::None
     }
 }
 
 /// Warn when a spawn/toggle binding's executable can't be found (PATH lookup;
 /// absolute paths are checked directly).
 fn warn_if_command_missing(command: Option<&str>) {
     let Some(cmd_str) = command else { return };
     let cmd_exe = cmd_str.split_whitespace().next().unwrap_or("");
     if cmd_exe.is_empty() {
         return;
     }
     if let Ok(path_var) = std::env::var("PATH") {
         for path_dir in std::env::split_paths(&path_var) {
             if path_dir.join(cmd_exe).is_file() {
                 return;
             }
         }
         eprintln!("[WARNING] Configured keybinding command not found in PATH: {}", cmd_exe);
     }
 }
 
 pub fn parse_keysym(key_str: &str) -> u32 {
     let name = if key_str.starts_with("XKB_KEY_") {
         &key_str[8..]
     } else {
         key_str
     };
     xkbcommon::xkb::keysym_from_name(name, xkbcommon::xkb::KEYSYM_CASE_INSENSITIVE).into()
 }
 
 pub fn default_config_path() -> Option<String> {
     let xdg_config_home = std::env::var("XDG_CONFIG_HOME")
         .unwrap_or_else(|_| {
             let home = std::env::var("HOME").unwrap_or_default();
             format!("{}/.config", home)
         });
         
     let kdl_path = format!("{}/cce/config.kdl", xdg_config_home);
     if std::path::Path::new(&kdl_path).exists() {
         Some(kdl_path)
     } else {
         None
     }
 }
 
 /// `<state_home>/cce/state.json`; `None` when neither `$XDG_STATE_HOME` nor
 /// `$HOME` is set, rather than a path relative to wherever we were started.
 pub fn default_state_path() -> Option<String> {
     let path = cce_core::config::cce_state_dir().join("state.json");
     path.is_absolute().then(|| path.to_string_lossy().into_owned())
 }
 
 fn expand_env_vars(s: &str) -> String {
     let mut result = String::with_capacity(s.len());
     let chars: Vec<char> = s.chars().collect();
     let mut i = 0;
     while i < chars.len() {
         if chars[i] == '$' && i + 1 < chars.len() {
             if chars[i + 1] == '{' {
                 // ${VAR} form
                 if let Some(end) = chars[i + 2..].iter().position(|c| *c == '}') {
                     let var_name: String = chars[i + 2..i + 2 + end].iter().collect();
                     let val = std::env::var(&var_name).unwrap_or_default();
                     result.push_str(&val);
                     i = i + 2 + end + 1; // skip ${VAR}
                 } else {
                     result.push(chars[i]);
                     i += 1;
                 }
             } else if chars[i + 1].is_ascii_alphabetic() || chars[i + 1] == '_' {
                 // $VAR form — name is [A-Za-z_][A-Za-z0-9_]*
                 let start = i + 1;
                 let mut end = start;
                 while end < chars.len() && (chars[end].is_ascii_alphanumeric() || chars[end] == '_')
                 {
                     end += 1;
                 }
                 let var_name: String = chars[start..end].iter().collect();
                 let val = std::env::var(&var_name).unwrap_or_default();
                 result.push_str(&val);
                 i = end;
             } else {
                 // $ followed by non-identifier char (e.g. $$, $:, $@) — keep as-is
                 result.push(chars[i]);
                 i += 1;
             }
         } else {
             result.push(chars[i]);
             i += 1;
         }
     }
     result
 }
 
 /// A node's keyed values in BOTH KDL spellings, as `(key, entry)`: its
 /// properties (`root color="…" blur=0.5 corner_radius=24`) and its child
 /// nodes' first positional value (`root { color "…"; blur 0.5;
 /// corner_radius 24 }`). The child form is what cce-data-editor writes and
 /// what cce-ui's `kdl_to_json` reads; a block parsed from properties alone
 /// silently keeps its defaults under it, which is how the compositor ran on
 /// a root radius of 12 while every cce-ui app read the config's 24
 /// (2026-09-28). Properties first, then children, so a key given both ways
 /// takes the child's.
 fn node_keyed_values(node: &kdl::KdlNode) -> Vec<(String, kdl::KdlEntry)> {
     let mut out: Vec<(String, kdl::KdlEntry)> = node
         .entries()
         .iter()
         .filter_map(|e| e.name().map(|n| (n.value().to_string(), e.clone())))
         .collect();
     if let Some(children) = node.children() {
         for child in children.nodes() {
             if let Some(e) = child.entries().first() {
                 if e.name().is_none() {
                     out.push((child.name().value().to_string(), e.clone()));
                 }
             }
         }
     }
     out
 }
 
 fn get_child_arg_i64(node: &kdl::KdlNode, child_name: &str, default: i64) -> i64 {
     if let Some(children) = node.children() {
         for child in children.nodes() {
             if child.name().value() == child_name {
                 if let Some(entry) = child.entries().first() {
                     return entry.value().as_i64().unwrap_or(default);
                 }
             }
         }
     }
     default
 }
 
 fn get_child_arg_i64_opt(node: &kdl::KdlNode, child_name: &str) -> Option<i64> {
     if let Some(children) = node.children() {
         for child in children.nodes() {
             if child.name().value() == child_name {
                 if let Some(entry) = child.entries().first() {
                     return entry.value().as_i64();
                 }
             }
         }
     }
     None
 }
 
 fn get_child_arg_f64(node: &kdl::KdlNode, child_name: &str, default: f64) -> f64 {
     if let Some(children) = node.children() {
         for child in children.nodes() {
             if child.name().value() == child_name {
                 if let Some(entry) = child.entries().first() {
                     let mut val = entry.value().as_f64().unwrap_or(default);
                     if let Some(ty) = entry.ty() {
                         let ty_str = ty.value();
                         if ty_str.starts_with("f64:") {
                             let range_str = ty_str.trim_start_matches("f64:");
                             if let Some(dash_idx) = range_str.find('-') {
                                 let min_str = &range_str[..dash_idx].trim();
                                 let max_str = &range_str[dash_idx + 1..].trim();
                                 if let (Ok(min_f), Ok(max_f)) = (min_str.parse::<f64>(), max_str.parse::<f64>()) {
                                     val = val.clamp(min_f, max_f);
                                 }
                             }
                         }
                     }
                     return val;
                 }
             }
         }
     }
     default
 }
 
 fn get_child_arg_bool(node: &kdl::KdlNode, child_name: &str, default: bool) -> bool {
     if let Some(children) = node.children() {
         for child in children.nodes() {
             if child.name().value() == child_name {
                 if let Some(entry) = child.entries().first() {
                     return entry.value().as_bool().unwrap_or(default);
                 }
             }
         }
     }
     default
 }
 
 fn get_child_arg_string(node: &kdl::KdlNode, child_name: &str, default: &str) -> String {
     if let Some(children) = node.children() {
         for child in children.nodes() {
             if child.name().value() == child_name {
                 if let Some(entry) = child.entries().first() {
                     return entry.value().as_string().map(|s| s.to_string()).unwrap_or_else(|| default.to_string());
                 }
             }
         }
     }
     default.to_string()
 }
 
 fn get_child_arg_bool_opt(node: &kdl::KdlNode, child_name: &str) -> Option<bool> {
     if let Some(children) = node.children() {
         for child in children.nodes() {
             if child.name().value() == child_name {
                 if let Some(entry) = child.entries().first() {
                     return entry.value().as_bool();
                 }
             }
         }
     }
     None
 }
 
 fn get_child_arg_f64_opt(node: &kdl::KdlNode, child_name: &str) -> Option<f64> {
     if let Some(children) = node.children() {
         for child in children.nodes() {
             if child.name().value() == child_name {
                 if let Some(entry) = child.entries().first() {
                     let mut val = entry.value().as_f64()?;
                     if let Some(ty) = entry.ty() {
                         let ty_str = ty.value();
                         if ty_str.starts_with("f64:") {
                             let range_str = ty_str.trim_start_matches("f64:");
                             if let Some(dash_idx) = range_str.find('-') {
                                 let min_str = &range_str[..dash_idx].trim();
                                 let max_str = &range_str[dash_idx + 1..].trim();
                                 if let (Ok(min_f), Ok(max_f)) = (min_str.parse::<f64>(), max_str.parse::<f64>()) {
                                     val = val.clamp(min_f, max_f);
                                 }
                             }
                         }
                     }
                     return Some(val);
                 }
             }
         }
     }
     None
 }
 
 fn get_child_arg_vec2i_opt(node: &kdl::KdlNode, child_name: &str) -> Option<[i32; 2]> {
     if let Some(children) = node.children() {
         for child in children.nodes() {
             if child.name().value() == child_name {
                 let entries = child.entries();
                 if entries.len() >= 2 {
                     let has_tag = entries.first().and_then(|e| e.ty()).map_or(false, |t| t.value() == "vec2i");
                     if has_tag {
                         let x = entries[0].value().as_i64()? as i32;
                         let y = entries[1].value().as_i64()? as i32;
                         return Some([x, y]);
                     }
                 }
             }
         }
     }
     None
 }
 
 
 /// All positional string args of a child node, e.g. `rounded_apps "a" "b"`.
 /// `Some` when the child node is present (even with no args), `None` when absent.
 fn get_child_args_string_vec_opt(node: &kdl::KdlNode, child_name: &str) -> Option<Vec<String>> {
     if let Some(children) = node.children() {
         for child in children.nodes() {
             if child.name().value() == child_name {
                 return Some(
                     child
                         .entries()
                         .iter()
                         .filter(|e| e.name().is_none())
                         .filter_map(|e| e.value().as_string().map(|s| s.to_string()))
                         .collect(),
                 );
             }
         }
     }
     None
 }
 
 fn get_child_arg_string_opt(node: &kdl::KdlNode, child_name: &str) -> Option<String> {
     if let Some(children) = node.children() {
         for child in children.nodes() {
             if child.name().value() == child_name {
                 if let Some(entry) = child.entries().first() {
                     return entry.value().as_string().map(|s| s.to_string());
                 }
             }
         }
     }
     None
 }
 
 fn get_prop_string(node: &kdl::KdlNode, key: &str, default: &str) -> String {
     for entry in node.entries() {
         if let Some(id) = entry.name() {
             if id.value() == key {
                 return entry.value().as_string().map(|s| s.to_string()).unwrap_or_else(|| default.to_string());
             }
         }
     }
     default.to_string()
 }
 
 fn get_prop_string_opt(node: &kdl::KdlNode, key: &str) -> Option<String> {
     for entry in node.entries() {
         if let Some(id) = entry.name() {
             if id.value() == key {
                 return entry.value().as_string().map(|s| s.to_string());
             }
         }
     }
     None
 }
 
 fn get_prop_i64(node: &kdl::KdlNode, key: &str, default: i64) -> i64 {
     for entry in node.entries() {
         if let Some(id) = entry.name() {
             if id.value() == key {
                 return entry.value().as_i64().unwrap_or(default);
             }
         }
     }
     default
 }
 
 fn get_prop_bool(node: &kdl::KdlNode, key: &str, default: bool) -> bool {
     for entry in node.entries() {
         if let Some(id) = entry.name() {
             if id.value() == key {
                 return entry.value().as_bool().unwrap_or(default);
             }
         }
     }
     default
 }
 
 fn get_prop_bool_opt(node: &kdl::KdlNode, key: &str) -> Option<bool> {
     for entry in node.entries() {
         if let Some(id) = entry.name() {
             if id.value() == key {
                 return entry.value().as_bool();
             }
         }
     }
     None
 }
 
 fn get_prop_i64_opt(node: &kdl::KdlNode, key: &str) -> Option<i64> {
     for entry in node.entries() {
         if let Some(id) = entry.name() {
             if id.value() == key {
                 return entry.value().as_i64();
             }
         }
     }
     None
 }
 
 fn get_prop_f64_opt(node: &kdl::KdlNode, key: &str) -> Option<f64> {
     for entry in node.entries() {
         if let Some(id) = entry.name() {
             if id.value() == key {
                 let mut val = entry.value().as_f64()?;
                 if let Some(ty) = entry.ty() {
                     let ty_str = ty.value();
                     if ty_str.starts_with("f64:") {
                         let range_str = ty_str.trim_start_matches("f64:");
                         if let Some(dash_idx) = range_str.find('-') {
                             let min_str = &range_str[..dash_idx].trim();
                             let max_str = &range_str[dash_idx + 1..].trim();
                             if let (Ok(min_f), Ok(max_f)) = (min_str.parse::<f64>(), max_str.parse::<f64>()) {
                                 val = val.clamp(min_f, max_f);
                             }
                         }
                     }
                 }
                 return Some(val);
             }
         }
     }
     None
 }
 
 fn get_nested_prop_string(node: &kdl::KdlNode, child_name: &str, prop_name: &str, default: &str) -> String {
     if let Some(children) = node.children() {
         for child in children.nodes() {
             if child.name().value() == child_name {
                 for entry in child.entries() {
                     if let Some(id) = entry.name() {
                         if id.value() == prop_name {
                             return entry.value().as_string().map(|s| s.to_string()).unwrap_or_else(|| default.to_string());
                         }
                     }
                 }
             }
         }
     }
     default.to_string()
 }
 
 fn get_nested_prop_i64(node: &kdl::KdlNode, child_name: &str, prop_name: &str, default: i64) -> i64 {
     if let Some(children) = node.children() {
         for child in children.nodes() {
             if child.name().value() == child_name {
                 for entry in child.entries() {
                     if let Some(id) = entry.name() {
                         if id.value() == prop_name {
                             return entry.value().as_i64().unwrap_or(default);
                         }
                     }
                 }
             }
         }
     }
     default
 }
 
 fn get_nested_prop_bool(node: &kdl::KdlNode, child_name: &str, prop_name: &str, default: bool) -> bool {
     if let Some(children) = node.children() {
         for child in children.nodes() {
             if child.name().value() == child_name {
                 for entry in child.entries() {
                     if let Some(id) = entry.name() {
                         if id.value() == prop_name {
                             return entry.value().as_bool().unwrap_or(default);
                         }
                     }
                 }
             }
         }
     }
     default
 }
 
 fn get_nested_prop_f64(node: &kdl::KdlNode, child_name: &str, prop_name: &str, default: f64) -> f64 {
     if let Some(children) = node.children() {
         for child in children.nodes() {
             if child.name().value() == child_name {
                 for entry in child.entries() {
                     if let Some(id) = entry.name() {
                         if id.value() == prop_name {
                             let mut val = entry.value().as_f64().unwrap_or(default);
                             if let Some(ty) = entry.ty() {
                                 let ty_str = ty.value();
                                 if ty_str.starts_with("f64:") {
                                     let range_str = ty_str.trim_start_matches("f64:");
                                     if let Some(dash_idx) = range_str.find('-') {
                                         let min_str = &range_str[..dash_idx].trim();
                                         let max_str = &range_str[dash_idx + 1..].trim();
                                         if let (Ok(min_f), Ok(max_f)) = (min_str.parse::<f64>(), max_str.parse::<f64>()) {
                                             val = val.clamp(min_f, max_f);
                                         }
                                     }
                                 }
                             }
                             return val;
                         }
                     }
                 }
             }
         }
     }
     default
 }
 
 /// `"344x215"` (also `344,215` / `344 215`) → (w, h) in mm, both positive.
 fn parse_size_mm(s: &str) -> Option<(f64, f64)> {
     let mut it = s.split(|c: char| c == 'x' || c == 'X' || c == ',' || c.is_whitespace()).filter(|p| !p.is_empty());
     let w = it.next()?.trim().parse::<f64>().ok()?;
     let h = it.next()?.trim().parse::<f64>().ok()?;
     (w > 0.0 && h > 0.0 && it.next().is_none()).then_some((w, h))
 }
 
 fn parse_kdl_config(content: &str) -> Result<Config, String> {
     let doc: kdl::KdlDocument = content.parse().map_err(|e| format!("KDL parse error: {}", e))?;
     
     // 1. layout & style
     let mut layout = LayoutConfig::default();
     if let Some(node) = doc.nodes().iter().find(|n| n.name().value() == "layout") {
         layout.gap = get_child_arg_i64(node, "gap", default_gap());
         layout.gap_top = get_child_arg_i64(node, "gap_top", default_gap_top());
         layout.gap_left = get_child_arg_i64(node, "gap_left", default_gap_left());
         layout.gap_right = get_child_arg_i64(node, "gap_right", default_gap_right());
         layout.gap_bottom = get_child_arg_i64(node, "gap_bottom", default_gap_bottom());
         layout.cascade_offset = get_child_arg_i64(node, "cascade_offset", default_cascade_offset());
         layout.bar_height = get_child_arg_i64(node, "bar_height", default_bar_height());
         layout.grid_gap = get_child_arg_i64(node, "grid_gap", default_grid_gap());
     }
     
     if let Some(node) = doc.nodes().iter().find(|n| n.name().value() == "style") {
         layout.transition_duration = get_nested_prop_i64(node, "window", "transition_duration", default_transition_duration());
         layout.window_backdrop_blur_ignore_transparent = get_nested_prop_bool(node, "window", "backdrop_blur_ignore_transparent", default_window_backdrop_blur_ignore_transparent());
         
         layout.overlay_behavior = get_nested_prop_string(node, "overlay", "behavior", &default_overlay_behavior());
         layout.overlay_width = get_nested_prop_i64(node, "overlay", "width", default_overlay_width());
         layout.overlay_position = get_nested_prop_string(node, "overlay", "position", &default_overlay_position());
         layout.overlay_border_gap = get_nested_prop_i64(node, "overlay", "border_gap", default_overlay_border_gap());
         
         layout.status_normal_color = get_nested_prop_string(node, "status", "normal_color", &default_status_normal_color());
         layout.status_background_blur = get_nested_prop_f64(node, "status", "background_blur", default_status_background_blur());
         layout.status_backdrop_blur_ignore_transparent = get_nested_prop_bool(node, "status", "backdrop_blur_ignore_transparent", default_status_backdrop_blur_ignore_transparent());
         layout.status_module_hide_mode_preview = get_nested_prop_i64(node, "status", "module_hide_mode_preview", default_status_module_hide_mode_preview());
         layout.status_module_spacing = get_nested_prop_i64(node, "status", "module_spacing", default_status_module_spacing());
     }
 
     // The status bar's own config file wins over the shared status keys:
     // ~/.config/cce/cce-status-interface/config.kdl, `module { spacing height }`.
     // Re-read on every config (re)load, so `ccectl reload` picks up edits.
     {
         let app_cfg = cce_core::config::get_app_config_path("cce-status-interface");
         if let Ok(content) = std::fs::read_to_string(&app_cfg) {
             if let Ok(app_doc) = content.parse::<kdl::KdlDocument>() {
                 if let Some(module) = app_doc.nodes().iter().find(|n| n.name().value() == "module") {
                     // A module key in either KDL spelling: `spacing=(f64)12`
                     // prop on the module node, or a `spacing 12` child node.
                     let module_i64 = |key: &str| -> Option<i64> {
                         module
                             .entries()
                             .iter()
                             .find(|e| e.name().map(|id| id.value()) == Some(key))
                             .map(|e| e.value())
                             .or_else(|| {
                                 module.children().and_then(|c| {
                                     c.nodes()
                                         .iter()
                                         .find(|n| n.name().value() == key)
                                         .and_then(|n| n.entries().first().map(|e| e.value()))
                                 })
                             })
                             .and_then(|v| v.as_i64().or_else(|| v.as_f64().map(|f| f.round() as i64)))
                     };
                     if let Some(i) = module_i64("spacing") {
                         layout.status_module_spacing = i;
                     }
                     if let Some(i) = module_i64("height") {
                         layout.bar_height = i;
                     }
                     // The droplet spec string (presence enables the style;
                     // empty = all defaults). Same either-spelling lookup.
                     let module_str = |key: &str| -> Option<String> {
                         module
                             .entries()
                             .iter()
                             .find(|e| e.name().map(|id| id.value()) == Some(key))
                             .map(|e| e.value())
                             .or_else(|| {
                                 module.children().and_then(|c| {
                                     c.nodes()
                                         .iter()
                                         .find(|n| n.name().value() == key)
                                         .and_then(|n| n.entries().first().map(|e| e.value()))
                                 })
                             })
                             .and_then(|v| v.as_string().map(|s| s.to_string()))
                     };
                     layout.status_droplet = module_str("droplet");
                     // Backdrop compression: the contrast ratio the text must
                     // hold, against the text color the bar draws in (its
                     // own fallback is the shared status normal_color).
                     let module_f64 = |key: &str| -> Option<f64> {
                         module
                             .entries()
                             .iter()
                             .find(|e| e.name().map(|id| id.value()) == Some(key))
                             .map(|e| e.value())
                             .or_else(|| {
                                 module.children().and_then(|c| {
                                     c.nodes()
                                         .iter()
                                         .find(|n| n.name().value() == key)
                                         .and_then(|n| n.entries().first().map(|e| e.value()))
                                 })
                             })
                             .and_then(|v| v.as_f64().or_else(|| v.as_i64().map(|i| i as f64)))
                     };
                     let text_color = module_str("text_color")
                         .unwrap_or_else(|| layout.status_normal_color.clone());
                     layout.status_backdrop_compress = module_f64("backdrop_compress")
                         .and_then(|ratio| backdrop_compress_params(&text_color, ratio));
                 }
             }
         }
     }
 
     // 2. env
     let mut env = HashMap::new();
     if let Some(node) = doc.nodes().iter().find(|n| n.name().value() == "env") {
         if let Some(children) = node.children() {
             for child in children.nodes() {
                 if let Some(entry) = child.entries().first() {
                     if let Some(val) = entry.value().as_string() {
                         env.insert(child.name().value().to_string(), val.to_string());
                     }
                 }
             }
         }
     }
 
     // 3. lists
     let mut key_bindings = Vec::new();
     let mut pointer_bind = Vec::new();
     let mut gesture_bind = Vec::new();
     let mut mode_rule = Vec::new();
     let mut tag_layout = Vec::new();
     let mut startup = Vec::new();
     let mut device = Vec::new();
     
     for node in doc.nodes() {
         match node.name().value() {
             "key_bindings" => {
                 if let Some(children) = node.children() {
                     for child in children.nodes() {
                         if child.name().value() == "bind" {
                             let mods = get_prop_string(child, "mods", "");
                             let key = get_prop_string(child, "key", "");
                             let action = get_prop_string(child, "action", "");
                             let command = get_prop_string_opt(child, "command");
                             key_bindings.push(KeybindConfig { mods, key, action, command });
                         }
                     }
                 } else {
                     let mods = get_prop_string(node, "mods", "");
                     let key = get_prop_string(node, "key", "");
                     let action = get_prop_string(node, "action", "");
                     let command = get_prop_string_opt(node, "command");
                     key_bindings.push(KeybindConfig { mods, key, action, command });
                 }
             }
             "pointer_bind" => {
                 let mods = get_prop_string(node, "mods", "");
                 let button = get_prop_string(node, "button", "");
                 let action = get_prop_string(node, "action", "");
                 pointer_bind.push(PointerBindConfig { mods, button, action });
             }
             "gesture_bind" => {
                 let mods = get_prop_string_opt(node, "mods");
                 let gesture_type = get_prop_string(node, "type", "");
                 let fingers = get_prop_i64(node, "fingers", 0) as u32;
                 let direction = get_prop_string(node, "direction", "");
                 let action = get_prop_string(node, "action", "");
                 let command = get_prop_string_opt(node, "command");
                 gesture_bind.push(GestureBindConfig { mods, gesture_type, fingers, direction, action, command });
             }
             "mode_rule" => {
                 let mode = get_prop_string(node, "mode", "");
                 let app_id = get_prop_string(node, "app_id", "");
                 let title = get_prop_string_opt(node, "title");
                 let single = get_prop_bool_opt(node, "single");
                 let tag = get_prop_i64_opt(node, "tag");
                 let circular = get_prop_bool_opt(node, "circular");
                 let ssd = get_prop_bool_opt(node, "ssd");
                 let over_sibling = get_prop_bool_opt(node, "over_sibling");
                 let center = get_prop_bool_opt(node, "center");
                 mode_rule.push(ModeRuleConfig { mode, app_id, title, single, tag, circular, ssd, over_sibling, center });
             }
             "tag_layout" => {
                 let tag = get_prop_i64(node, "tag", 0);
                 let mode = get_prop_string(node, "mode", "");
                 tag_layout.push(TagLayoutConfig { tag, mode });
             }
             "startup" => {
                 let exec = get_prop_string(node, "exec", "");
                 let once = get_prop_bool(node, "once", false);
                 let restart = get_prop_bool(node, "restart", false);
                 startup.push(StartupConfig { exec, once, restart });
             }
             "device" => {
                 let name = get_prop_string(node, "name", "");
                 let scroll_factor = get_prop_f64_opt(node, "scroll_factor");
                 device.push(InputDeviceConfigRule { name, scroll_factor });
             }
             _ => {}
         }
     }
 
     if key_bindings.is_empty() {
         if let Some(input_node) = doc.nodes().iter().find(|n| n.name().value() == "input") {
             if let Some(children) = input_node.children() {
                 for child_node in children.nodes() {
                     if child_node.name().value() == "key_bindings" {
                         if let Some(bind_children) = child_node.children() {
                             for child in bind_children.nodes() {
                                 if child.name().value() == "bind" {
                                     let mods = get_prop_string(child, "mods", "");
                                     let key = get_prop_string(child, "key", "");
                                     let action = get_prop_string(child, "action", "");
                                     let command = get_prop_string_opt(child, "command");
                                     key_bindings.push(KeybindConfig { mods, key, action, command });
                                 }
                             }
                         } else {
                             let mods = get_prop_string(child_node, "mods", "");
                             let key = get_prop_string(child_node, "key", "");
                             let action = get_prop_string(child_node, "action", "");
                             let command = get_prop_string_opt(child_node, "command");
                             key_bindings.push(KeybindConfig { mods, key, action, command });
                         }
                     }
                 }
             }
         }
     }
 
     // 3b. idle timeouts
     let mut idle = crate::idle::IdleConfig::default();
     if let Some(node) = doc.nodes().iter().find(|n| n.name().value() == "idle") {
         idle.display_off_s = get_child_arg_i64(node, "display_off", 0);
         idle.sleep_s = get_child_arg_i64(node, "sleep", 0);
         idle.sleep_command = get_child_arg_string_opt(node, "sleep_command");
     }
 
     // 4. output
     let mut output = None;
     let mut display = HashMap::new();
     if let Some(node) = doc.nodes().iter().find(|n| n.name().value() == "output") {
         let scenefx_optimized_blur = get_child_arg_bool(node, "scenefx_optimized_blur", true);
         output = Some(OutputConfig { scenefx_optimized_blur });
 
         if let Some(children) = node.children() {
             for child in children.nodes() {
                 let name = child.name().value();
                 let mut parsed_scale = None;
                 if let Some(entry) = child.entries().iter().find(|e| e.name().map(|n| n.value()) == Some("scale")) {
                     if let Some(num) = entry.value().as_f64() {
                         parsed_scale = Some(num);
                     }
                 }
                 // `size_mm="344x215"`: the panel's real size, overriding
                 // the EDID figure the backend read (TVs and projectors
                 // lie; some panels report nothing). Forwarded into the
                 // wl_output geometry every client sees, so cce-ui's metric
                 // measures against it.
                 let mut parsed_size_mm = None;
                 if let Some(entry) = child.entries().iter().find(|e| e.name().map(|n| n.value()) == Some("size_mm")) {
                     parsed_size_mm = entry.value().as_string().and_then(parse_size_mm);
                 }
                 let mut parsed_interval = None;
                 if let Some(entry) = child.entries().iter().find(|e| e.name().map(|n| n.value()) == Some("brightness_interval")) {
                     if let Some(num) = entry.value().as_i64() {
                         parsed_interval = Some(num);
                     }
                 }
                 let mut parsed_up = None;
                 if let Some(entry) = child.entries().iter().find(|e| e.name().map(|n| n.value()) == Some("brightness_up")) {
                     if let Some(key_val) = entry.value().as_string() {
                         parsed_up = Some(key_val.to_string());
                     }
                 }
                 let mut parsed_down = None;
                 if let Some(entry) = child.entries().iter().find(|e| e.name().map(|n| n.value()) == Some("brightness_down")) {
                     if let Some(key_val) = entry.value().as_string() {
                         parsed_down = Some(key_val.to_string());
                     }
                 }
 
                 if let Some(display_children) = child.children() {
                     if parsed_scale.is_none() {
                         if let Some(scale_node) = display_children.nodes().iter().find(|n| n.name().value() == "scale") {
                             if let Some(entry) = scale_node.entries().first() {
                                 if let Some(num) = entry.value().as_f64() {
                                     parsed_scale = Some(num);
                                 }
                             }
                         }
                     }
                     if parsed_size_mm.is_none() {
                         if let Some(size_node) = display_children.nodes().iter().find(|n| n.name().value() == "size_mm") {
                             if let Some(entry) = size_node.entries().first() {
                                 parsed_size_mm = entry.value().as_string().and_then(parse_size_mm);
                             }
                         }
                     }
                     if parsed_interval.is_none() {
                         if let Some(interval_node) = display_children.nodes().iter().find(|n| n.name().value() == "brightness_interval") {
                             if let Some(entry) = interval_node.entries().first() {
                                 if let Some(num) = entry.value().as_i64() {
                                     parsed_interval = Some(num);
                                 }
                             }
                         }
                     }
                     if parsed_up.is_none() {
                         if let Some(up_node) = display_children.nodes().iter().find(|n| n.name().value() == "brightness_up") {
                             if let Some(entry) = up_node.entries().first() {
                                 if let Some(key_val) = entry.value().as_string() {
                                     parsed_up = Some(key_val.to_string());
                                 }
                             }
                         }
                     }
                     if parsed_down.is_none() {
                         if let Some(down_node) = display_children.nodes().iter().find(|n| n.name().value() == "brightness_down") {
                             if let Some(entry) = down_node.entries().first() {
                                 if let Some(key_val) = entry.value().as_string() {
                                     parsed_down = Some(key_val.to_string());
                                 }
                             }
                         }
                     }
                 }
 
                 if let Some(num) = parsed_scale {
                     display.insert(format!("scale_{}", name), num);
                 }
                 if let Some((w, h)) = parsed_size_mm {
                     display.insert(format!("mm_w_{}", name), w);
                     display.insert(format!("mm_h_{}", name), h);
                 }
                 let interval = parsed_interval.unwrap_or(10);
                 if parsed_interval.is_some() {
                     display.insert(format!("brightness_interval_{}", name), interval as f64);
                 }
                 if let Some(key_val) = parsed_up {
                     key_bindings.push(KeybindConfig {
                         mods: "".to_string(),
                         key: key_val,
                         action: "spawn".to_string(),
                         command: Some(format!("brightnessctl set {}%+", interval)),
                     });
                 }
                 if let Some(key_val) = parsed_down {
                     key_bindings.push(KeybindConfig {
                         mods: "".to_string(),
                         key: key_val,
                         action: "spawn".to_string(),
                         command: Some(format!("brightnessctl set {}%-", interval)),
                     });
                 }
             }
         }
     }
 
     // 6. input
     let mut input = None;
     if let Some(node) = doc.nodes().iter().find(|n| n.name().value() == "input") {
         let accel_speed = get_child_arg_f64_opt(node, "accel_speed");
         let accel_profile = get_child_arg_string_opt(node, "accel_profile");
         let scroll_factor = get_child_arg_f64_opt(node, "scroll_factor");
         let scroll_ease = get_child_arg_f64_opt(node, "scroll_ease");
         let kinetic_scroll = get_child_arg_bool_opt(node, "kinetic_scroll");
         let scroll_friction = get_child_arg_f64_opt(node, "scroll_friction");
         let repeat_rate = get_child_arg_i64_opt(node, "repeat_rate");
         let repeat_delay = get_child_arg_i64_opt(node, "repeat_delay");
 
         let mut touchpad = None;
         if let Some(children) = node.children() {
             // `trackpad` is the input.kdl spelling, `touchpad` the legacy one.
             if let Some(tp_node) = children
                 .nodes()
                 .iter()
                 .find(|n| n.name().value() == "touchpad" || n.name().value() == "trackpad")
             {
                 let tap_to_click = get_child_arg_bool_opt(tp_node, "tap_to_click");
                 let natural_scroll = get_child_arg_bool_opt(tp_node, "natural_scroll");
                 let dwt = get_child_arg_bool_opt(tp_node, "dwt");
                 let dwtp = get_child_arg_bool_opt(tp_node, "dwtp");
 
                 let mut gestures = None;
                 if let Some(tp_children) = tp_node.children() {
                     if let Some(gestures_node) = tp_children.nodes().iter().find(|n| n.name().value() == "gestures") {
                         let swipe = get_child_arg_bool_opt(gestures_node, "swipe");
                         let pinch = get_child_arg_bool_opt(gestures_node, "pinch");
                         gestures = Some(GesturesConfig { swipe, pinch });
                     }
                 }
 
                 touchpad = Some(TouchpadConfig {
                     tap_to_click,
                     natural_scroll,
                     dwt,
                     dwtp,
                     gestures,
                     accel_speed: get_child_arg_f64_opt(tp_node, "accel_speed"),
                     accel_profile: get_child_arg_string_opt(tp_node, "accel_profile"),
                     scroll_factor: get_child_arg_f64_opt(tp_node, "scroll_factor"),
                 });
             }
         }
 
         let mut trackpoint = None;
         if let Some(children) = node.children() {
             if let Some(tp_node) = children.nodes().iter().find(|n| n.name().value() == "trackpoint") {
                 let accel_speed = get_child_arg_f64_opt(tp_node, "accel_speed");
                 let accel_profile = get_child_arg_string_opt(tp_node, "accel_profile");
                 trackpoint = Some(TrackpointConfig {
                     accel_speed,
                     accel_profile,
                     scroll_factor: get_child_arg_f64_opt(tp_node, "scroll_factor"),
                     scroll_method: get_child_arg_string_opt(tp_node, "scroll_method"),
                 });
             }
         }
 
         let mut mouse = None;
         if let Some(children) = node.children() {
             if let Some(m_node) = children.nodes().iter().find(|n| n.name().value() == "mouse") {
                 mouse = Some(MouseConfig {
                     accel_speed: get_child_arg_f64_opt(m_node, "accel_speed"),
                     accel_profile: get_child_arg_string_opt(m_node, "accel_profile"),
                     scroll_factor: get_child_arg_f64_opt(m_node, "scroll_factor"),
                     scroll_method: get_child_arg_string_opt(m_node, "scroll_method"),
                 });
             }
         }
 
         input = Some(InputConfig {
             accel_speed,
             accel_profile,
             scroll_factor,
             scroll_ease,
             kinetic_scroll,
             scroll_friction,
             repeat_rate,
             repeat_delay,
             mouse,
             touchpad,
             trackpoint,
         });
     }
 
     // 7. transparency
     let mut transparency = None;
     if let Some(node) = doc.nodes().iter().find(|n| n.name().value() == "transparency") {
         let opacity = get_child_arg_f64(node, "opacity", 0.9);
         transparency = Some(TransparencyConfig { opacity: Some(opacity) });
     }
 
     // 8. surface
     let mut surface = SurfaceConfig::default();
     let mut found_nested = false;
     if let Some(style_node) = doc.nodes().iter().find(|n| n.name().value() == "style") {
         if let Some(style_children) = style_node.children() {
             if let Some(surface_node) = style_children.nodes().iter().find(|n| n.name().value() == "surface") {
                 if let Some(surface_children) = surface_node.children() {
                     if let Some(desktop_node) = surface_children.nodes().iter().find(|n| n.name().value() == "desktop") {
                         found_nested = true;
                         for entry in desktop_node.entries() {
                             if let Some(id) = entry.name() {
                                 match id.value() {
                                     "gap_color" => {
                                         if let Some(val) = entry.value().as_string() {
                                             surface.desktop_gap_color = val.to_string();
                                         }
                                     }
                                     "cell_color" => {
                                         if let Some(val) = entry.value().as_string() {
                                             surface.desktop_cell_color = val.to_string();
                                         }
                                     }
                                     "gap_width" => {
                                         if let Some(val) = entry.value().as_i64() {
                                             surface.desktop_gap_width = val;
                                         }
                                     }
                                     "line_relief" => {
                                         if let Some(val) = entry.value().as_i64() {
                                             surface.desktop_line_relief = val;
                                         } else if let Some(s) = entry.value().as_string() {
                                             // A (relief) value: the fallback
                                             // honors its width — the client
                                             // installs the full material,
                                             // but the scenefx chamfer has no
                                             // custom profile to install.
                                             if let Some(spec) = cce_core::relief_spec::ReliefSpec::parse(s) {
                                                 surface.desktop_line_relief = spec.width.round() as i64;
                                             }
                                         }
                                     }
                                     "cell_fade_inset" => {
                                         if let Some(val) = entry.value().as_i64() {
                                             surface.desktop_cell_fade_inset = val;
                                         }
                                     }
                                     "cell_labels" => {
                                         if let Some(val) = entry.value().as_bool() {
                                             surface.desktop_cell_labels = val;
                                         }
                                     }
                                     "grid_fade_mode" => {
                                         if let Some(val) = entry.value().as_string() {
                                             surface.desktop_grid_fade_mode = val.to_string();
                                         }
                                     }
                                     "grid_cell_size" | "desktop_grid_scale" => {
                                         if let Some(val) = entry.value().as_i64() {
                                             surface.desktop_grid_scale = val;
                                         }
                                     }
                                     "grid_cell_width" => {
                                         if let Some(val) = entry.value().as_i64() {
                                             surface.grid_cell_width = Some(val);
                                         }
                                     }
                                     "grid_cell_height" => {
                                         if let Some(val) = entry.value().as_i64() {
                                             surface.grid_cell_height = Some(val);
                                         }
                                     }
                                     "snap" => {
                                         if let Some(val) = entry.value().as_bool() {
                                             surface.desktop_snap = val;
                                         }
                                     }
                                     "overview_ramp" => {
                                         if let Some(val) = entry.value().as_string() {
                                             surface.desktop_overview_ramp = val.to_string();
                                         }
                                     }
                                     "overview_ms" => {
                                         if let Some(val) = entry.value().as_i64() {
                                             surface.desktop_overview_ms = val;
                                         }
                                     }
                                     "snap_threshold" => {
                                         if let Some(val) = entry.value().as_i64() {
                                             surface.desktop_snap_threshold = val;
                                         }
                                     }
                                     "edge_pan" => {
                                         if let Some(val) = entry.value().as_bool() {
                                             surface.desktop_edge_pan = val;
                                         }
                                     }
                                     "edge_pan_band" => {
                                         if let Some(val) = entry.value().as_i64() {
                                             surface.desktop_edge_pan_band = val;
                                         }
                                     }
                                     "edge_pan_speed" => {
                                         if let Some(val) = entry.value().as_i64() {
                                             surface.desktop_edge_pan_speed = val;
                                         }
                                     }
                                     _ => {}
                                 }
                             }
                         }
                     }
                     // RFC Phase 7a (cce-ui): `plate { root ... }` is the one
                     // spelling of the root-plate style; the compositor reads
                     // the silhouette values from this block. The legacy
                     // `root plate` read-alias was removed 2026-09-06 after
                     // every live config had migrated.
                     let root_plate_node = surface_children
                         .nodes()
                         .iter()
                         .find(|n| n.name().value() == "plate")
                         .and_then(|n| n.children())
                         .and_then(|c| c.nodes().iter().find(|n| n.name().value() == "root"));
                     if let Some(root_node) = root_plate_node {
                         found_nested = true;
                         // Both spellings — properties on the `root` line and
                         // child nodes inside `root { … }` — see
                         // `node_keyed_values`. This block is the one the
                         // window silhouette comes from, and cce-ui reads the
                         // same keys either way; reading one spelling here put
                         // the compositor's clip and the apps' root plates on
                         // different radii.
                         for (key, entry) in node_keyed_values(root_node) {
                             match key.as_str() {
                                 "color" => {
                                     if let Some(val) = entry.value().as_string() {
                                         surface.root_plate_color = val.to_string();
                                     }
                                 }
                                 "blur" => {
                                     if let Some(mut val) = entry.value().as_f64() {
                                         if let Some(ty) = entry.ty() {
                                             let ty_str = ty.value();
                                             if ty_str.starts_with("f64:") {
                                                 let range_str = ty_str.trim_start_matches("f64:");
                                                 if let Some(dash_idx) = range_str.find('-') {
                                                     let min_str = &range_str[..dash_idx].trim();
                                                     let max_str = &range_str[dash_idx + 1..].trim();
                                                     if let (Ok(min_f), Ok(max_f)) = (min_str.parse::<f64>(), max_str.parse::<f64>()) {
                                                         val = val.clamp(min_f, max_f);
                                                     }
                                                 }
                                             }
                                         }
                                         surface.root_plate_blur = val;
                                     }
                                 }
                                 "corner_radius" => {
                                     if let Some(val) = entry.value().as_i64() {
                                         surface.root_plate_corner_radius = val;
                                     }
                                 }
                                 _ => {}
                             }
                         }
                     }
                     // `surface { fade in_ms=140 out_ms=120 }` — the DE-wide
                     // open/close dissolve, read here so both halves of it
                     // (the compositor's scene-node ramp and the deadline a
                     // closing client waits on) come from one place.
                     if let Some(fade_node) = surface_children.nodes().iter().find(|n| n.name().value() == "fade") {
                         found_nested = true;
                         for entry in fade_node.entries() {
                             if let Some(id) = entry.name() {
                                 match id.value() {
                                     "in_ms" => {
                                         if let Some(val) = entry.value().as_i64() {
                                             surface.fade_in_ms = val;
                                         }
                                     }
                                     "out_ms" => {
                                         if let Some(val) = entry.value().as_i64() {
                                             surface.fade_out_ms = val;
                                         }
                                     }
                                     _ => {}
                                 }
                             }
                         }
                     }
                     if let Some(border_node) = surface_children.nodes().iter().find(|n| n.name().value() == "border") {
                         found_nested = true;
                         for entry in border_node.entries() {
                             if let Some(id) = entry.name() {
                                 match id.value() {
                                     "width" => {
                                         if let Some(val) = entry.value().as_i64() {
                                             surface.border_width = val;
                                         }
                                     }
                                     "color" => {
                                         if let Some(val) = entry.value().as_string() {
                                             surface.border_color = val.to_string();
                                         }
                                     }
                                     "color_focused" => {
                                         if let Some(val) = entry.value().as_string() {
                                             surface.border_color_focused = Some(val.to_string());
                                         }
                                     }
                                     "color_hover" => {
                                         if let Some(val) = entry.value().as_string() {
                                             surface.border_color_hover = Some(val.to_string());
                                         }
                                     }
                                     // No `corner_radius` here: the border
                                     // ring, its discs and the frame take the
                                     // ONE window radius, `plate.root.
                                     // corner_radius` (see `Layout::
                                     // root_plate_corner_radius`). The key was
                                     // read into dead config until 2026-09-28
                                     // and is ignored now, like any unknown one.
                                     "segment_gap" => {
                                         if let Some(val) = entry.value().as_i64() {
                                             surface.border_segment_gap = val;
                                         }
                                     }
                                     "taper" => {
                                         if let Some(val) = entry.value().as_f64() {
                                             surface.border_taper = val;
                                         } else if let Some(val) = entry.value().as_i64() {
                                             surface.border_taper = val as f64;
                                         }
                                     }
                                     "handle_width" => {
                                         if let Some(val) = entry.value().as_f64() {
                                             surface.border_handle_width = val;
                                         } else if let Some(val) = entry.value().as_i64() {
                                             surface.border_handle_width = val as f64;
                                         }
                                     }
                                     "overlap_opacity" => {
                                         if let Some(val) = entry.value().as_f64() {
                                             surface.border_overlap_opacity = val;
                                         } else if let Some(val) = entry.value().as_i64() {
                                             surface.border_overlap_opacity = val as f64;
                                         }
                                     }
                                     "swell_curve" => {
                                         if let Some(val) = entry.value().as_f64() {
                                             surface.border_swell_curve = val;
                                         } else if let Some(val) = entry.value().as_i64() {
                                             surface.border_swell_curve = val as f64;
                                         }
                                     }
                                     "bulge" => {
                                         if let Some(val) = entry.value().as_f64() {
                                             surface.border_corner_bulge = val;
                                         } else if let Some(val) = entry.value().as_i64() {
                                             surface.border_corner_bulge = val as f64;
                                         }
                                     }
                                     "corner_length" => {
                                         if let Some(val) = entry.value().as_i64() {
                                             surface.border_corner_length = val;
                                         }
                                     }
                                     _ => {}
                                 }
                             }
                         }
                     }
                     if let Some(bevel_node) = surface_children.nodes().iter().find(|n| n.name().value() == "bevel") {
                         found_nested = true;
                         for entry in bevel_node.entries() {
                             if let Some(id) = entry.name() {
                                 match id.value() {
                                     "enabled" => {
                                         if let Some(val) = entry.value().as_bool() {
                                             surface.bevel_enabled = val;
                                         }
                                     }
                                     "thickness" => {
                                         if let Some(val) = entry.value().as_f64() {
                                             surface.bevel_thickness = val;
                                         } else if let Some(val) = entry.value().as_i64() {
                                             surface.bevel_thickness = val as f64;
                                         }
                                     }
                                     "light" => {
                                         if let Some(val) = entry.value().as_string() {
                                             surface.bevel_light = val.to_string();
                                         }
                                     }
                                     "light_intensity" => {
                                         if let Some(val) = entry.value().as_f64() {
                                             surface.bevel_light_intensity = val;
                                         }
                                     }
                                     "shade_intensity" => {
                                         if let Some(val) = entry.value().as_f64() {
                                             surface.bevel_shade_intensity = val;
                                         }
                                     }
                                     "shoulder" => {
                                         if let Some(val) = entry.value().as_f64() {
                                             surface.bevel_shoulder = val;
                                         }
                                     }
                                     "color" => {
                                         if let Some(val) = entry.value().as_string() {
                                             surface.bevel_color = val.to_string();
                                         }
                                     }
                                     "focus_sharpness" => {
                                         if let Some(val) = entry.value().as_f64() {
                                             surface.bevel_focus_sharpness = val;
                                         } else if let Some(val) = entry.value().as_i64() {
                                             surface.bevel_focus_sharpness = val as f64;
                                         }
                                     }
                                     "focus_color" => {
                                         if let Some(val) = entry.value().as_string() {
                                             surface.bevel_focus_color = val.to_string();
                                         }
                                     }
                                     _ => {}
                                 }
                             }
                         }
                     }
                     if let Some(shadow_node) = surface_children.nodes().iter().find(|n| n.name().value() == "shadow") {
                         found_nested = true;
                         for entry in shadow_node.entries() {
                             if let Some(id) = entry.name() {
                                 match id.value() {
                                     "enabled" => {
                                         if let Some(val) = entry.value().as_bool() {
                                             surface.shadow_enabled = val;
                                         }
                                     }
                                     // Named `blur` to match the status/root plate blur keys.
                                     "blur" => {
                                         if let Some(val) = entry.value().as_f64() {
                                             surface.shadow_sigma = val;
                                         } else if let Some(val) = entry.value().as_i64() {
                                             surface.shadow_sigma = val as f64;
                                         }
                                     }
                                     "color" => {
                                         if let Some(val) = entry.value().as_string() {
                                             surface.shadow_color = val.to_string();
                                         }
                                     }
                                     "offset_x" => {
                                         if let Some(val) = entry.value().as_i64() {
                                             surface.shadow_offset_x = val;
                                         }
                                     }
                                     "offset_y" => {
                                         if let Some(val) = entry.value().as_i64() {
                                             surface.shadow_offset_y = val;
                                         }
                                     }
                                     "tiled" => {
                                         if let Some(val) = entry.value().as_bool() {
                                             surface.shadow_tiled = val;
                                         }
                                     }
                                     _ => {}
                                 }
                             }
                         }
                     }
                     if let Some(cloud_node) = surface_children.nodes().iter().find(|n| n.name().value() == "cloud") {
                         found_nested = true;
                         if let Some(pos) = get_child_arg_vec2i_opt(cloud_node, "position_default") {
                             surface.cloud_position_default = Some(pos);
                         }
                     }
                 }
             }
         }
     }
     if !found_nested {
         if let Some(node) = doc.nodes().iter().find(|n| n.name().value() == "surface") {
             surface.desktop_gap_color = get_child_arg_string(node, "desktop_gap_color", &default_desktop_gap_color());
             surface.desktop_cell_color = get_child_arg_string(node, "desktop_cell_color", &default_desktop_cell_color());
             surface.desktop_grid_scale = get_child_arg_i64(node, "grid_cell_size", get_child_arg_i64(node, "desktop_grid_scale", default_desktop_grid_scale()));
             surface.grid_cell_width = match get_child_arg_i64(node, "grid_cell_width", i64::MIN) {
                 i64::MIN => None,
                 v => Some(v),
             };
             surface.grid_cell_height = match get_child_arg_i64(node, "grid_cell_height", i64::MIN) {
                 i64::MIN => None,
                 v => Some(v),
             };
             surface.desktop_gap_width = get_child_arg_i64(node, "desktop_gap_width", default_desktop_gap_width());
             surface.desktop_cell_fade_inset = get_child_arg_i64(node, "desktop_cell_fade_inset", default_desktop_cell_fade_inset());
             surface.desktop_grid_fade_mode = get_child_arg_string(node, "grid_fade_mode", &default_desktop_grid_fade_mode());
             surface.desktop_snap = get_child_arg_bool(node, "desktop_snap", default_desktop_snap());
             surface.desktop_overview_ramp = get_child_arg_string(node, "desktop_overview_ramp", "");
             surface.desktop_overview_ms = get_child_arg_i64(node, "desktop_overview_ms", default_desktop_overview_ms());
             surface.desktop_snap_threshold = get_child_arg_i64(node, "desktop_snap_threshold", default_desktop_snap_threshold());
             surface.desktop_edge_pan = get_child_arg_bool(node, "desktop_edge_pan", default_desktop_edge_pan());
             surface.desktop_edge_pan_band = get_child_arg_i64(node, "desktop_edge_pan_band", default_desktop_edge_pan_band());
             surface.desktop_edge_pan_speed = get_child_arg_i64(node, "desktop_edge_pan_speed", default_desktop_edge_pan_speed());
             surface.root_plate_color = get_child_arg_string(node, "root_plate_color", &default_root_plate_color());
             surface.root_plate_blur = get_child_arg_f64(node, "root_plate_blur", default_root_plate_blur());
             surface.root_plate_corner_radius = get_child_arg_i64(node, "root_plate_corner_radius", default_root_plate_corner_radius());
             surface.border_width = get_child_arg_i64(node, "border_width", default_border_width());
             surface.border_color = get_child_arg_string(node, "border_color", &default_border_color());
             surface.border_color_focused = get_child_arg_string_opt(node, "border_color_focused");
             surface.border_color_hover = get_child_arg_string_opt(node, "border_color_hover");
             surface.border_segment_gap = get_child_arg_i64(node, "border_segment_gap", default_border_segment_gap());
             surface.border_corner_length = get_child_arg_i64(node, "border_corner_length", 0);
             surface.cloud_position_default = get_child_arg_vec2i_opt(node, "cloud_position_default");
         }
     }
 
     // window manager
     let mut window_manager = None;
     if let Some(node) = doc.nodes().iter().find(|n| n.name().value() == "window manager" || n.name().value() == "window_manager") {
         let close_window = get_child_arg_string_opt(node, "close_window");
         let toggle_fullscreen = get_child_arg_string_opt(node, "toggle_fullscreen");
         let toggle_overview = get_child_arg_string_opt(node, "toggle_overview");
         let window_switcher = get_child_arg_string_opt(node, "window_switcher");
         let window_switcher_prev = get_child_arg_string_opt(node, "window_switcher_prev");
         let center_on_spawn = get_child_arg_bool_opt(node, "center_on_spawn");
         let on_app_exit = get_child_arg_string_opt(node, "on_app_exit");
         let corner_shape = get_child_arg_f64_opt(node, "corner_shape");
         let rounded_apps = get_child_args_string_vec_opt(node, "rounded_apps");
         let bevel_apps = get_child_args_string_vec_opt(node, "bevel_apps");
         let xwayland_hidpi = get_child_arg_bool_opt(node, "xwayland_hidpi");
         let xwayland_hidpi_except = get_child_args_string_vec_opt(node, "xwayland_hidpi_except");
         let touchpad_view_apps = get_child_args_string_vec_opt(node, "touchpad_view_apps");
         let touchpad_view_swipe = get_child_arg_string_opt(node, "touchpad_view_swipe");
         let touchpad_view_sensitivity = get_child_arg_f64_opt(node, "touchpad_view_sensitivity");
         let swipe_peek = get_child_arg_f64_opt(node, "swipe_peek");
         let swipe_repeat_peek = get_child_arg_f64_opt(node, "swipe_repeat_peek");
         let swipe_focus_cone = get_child_arg_f64_opt(node, "swipe_focus_cone");
         let swipe_threshold = get_child_arg_f64_opt(node, "swipe_threshold");
         let swipe_repeat_threshold = get_child_arg_f64_opt(node, "swipe_repeat_threshold");
         let touchpad_view_invert = get_child_arg_bool_opt(node, "touchpad_view_invert");
         let touchpad_hscroll_shift_apps = get_child_args_string_vec_opt(node, "touchpad_hscroll_shift_apps");
         let osk_on_touch = get_child_arg_bool_opt(node, "osk_on_touch");
         window_manager = Some(WindowManagerConfig { close_window, toggle_fullscreen, toggle_overview, window_switcher, window_switcher_prev, center_on_spawn, on_app_exit, corner_shape, rounded_apps, bevel_apps, xwayland_hidpi, xwayland_hidpi_except, touchpad_view_apps, touchpad_view_swipe, touchpad_view_sensitivity, swipe_peek, swipe_repeat_peek, swipe_focus_cone, swipe_threshold, swipe_repeat_threshold, touchpad_view_invert, touchpad_hscroll_shift_apps, osk_on_touch });
     }
 
     Ok(Config {
         layout,
         env,
         key_bindings,
         pointer_bind,
         mode_rule,
         tag_layout,
         startup,
         output,
         display,
         device,
         input,
         gesture_bind,
         transparency,
         surface,
         window_manager,
         idle,
     })
 }
 
 pub fn parse_config(path: &str, state: &mut crate::window_manager::WindowManager) -> Result<(), String> {
     let content = match fs::read_to_string(path) {
         Ok(c) => c,
         Err(e) => return Err(format!("cannot open {}: {}", path, e)),
     };
 
     let mut config: Config = parse_kdl_config(&content)?;
 
     let path_buf = std::path::Path::new(path);
     let input_path = path_buf.parent().unwrap_or_else(|| std::path::Path::new(".")).join("input.kdl");
     let mut wm_domain_entries: Vec<cce_core::input::BindingEntry> = Vec::new();
     if input_path.exists() {
         if let Ok(input_content) = fs::read_to_string(&input_path) {
             // New domain-scoped format: a `cce-window-manager { ... }` block
             // of `<action_name> "<chord>"` bindings. Other domains belong to
             // clients/widgets and are ignored here.
             match cce_core::input::InputConfig::parse(&input_content) {
                 Ok(ic) => {
                     wm_domain_entries = ic.domain(cce_core::input::WINDOW_MANAGER_DOMAIN).to_vec();
                 }
                 Err(e) => eprintln!("[WARNING] {}: {}", input_path.display(), e),
             }
             // Legacy input.kdl contents: root-level key_bindings nodes and
             // the input section.
             if let Ok(input_config) = parse_kdl_config(&input_content) {
                 config.key_bindings.extend(input_config.key_bindings);
                 if input_config.input.is_some() {
                     config.input = input_config.input;
                 }
             }
         }
     }
 
     state.output_scale = 1.0f32;
     state.xwayland_hidpi = config
         .window_manager
         .as_ref()
         .and_then(|wm| wm.xwayland_hidpi)
         .unwrap_or(true);
     state.xwayland_hidpi_except = config
         .window_manager
         .as_ref()
         .and_then(|wm| wm.xwayland_hidpi_except.clone())
         .unwrap_or_default();
     {
         let tv = config.window_manager.as_ref();
         state.touchpad_view_apps = tv.and_then(|w| w.touchpad_view_apps.clone()).unwrap_or_default();
         state.touchpad_view_swipe_tumble = tv
             .and_then(|w| w.touchpad_view_swipe.as_deref())
             .map_or(false, |s| s.eq_ignore_ascii_case("tumble"));
         state.touchpad_view_sensitivity = tv.and_then(|w| w.touchpad_view_sensitivity).unwrap_or(1.0);
         state.swipe_peek_px = tv
             .and_then(|w| w.swipe_peek)
             .filter(|v| v.is_finite() && *v >= 0.0)
             .unwrap_or(60.0);
         state.swipe_repeat_peek_px = tv
             .and_then(|w| w.swipe_repeat_peek)
             .filter(|v| v.is_finite() && *v >= 0.0)
             .unwrap_or(state.swipe_peek_px * 0.5);
         state.swipe_focus_cone_deg = tv
             .and_then(|w| w.swipe_focus_cone)
             .filter(|v| v.is_finite())
             .map_or(45.0, |v| v.clamp(1.0, 89.0));
         state.swipe_threshold = tv
             .and_then(|w| w.swipe_threshold)
             .filter(|v| v.is_finite() && *v > 0.0)
             .unwrap_or(70.0);
         state.swipe_repeat_threshold = tv
             .and_then(|w| w.swipe_repeat_threshold)
             .filter(|v| v.is_finite() && *v > 0.0)
             .unwrap_or(state.swipe_threshold * 4.0);
         state.touchpad_view_invert = tv.and_then(|w| w.touchpad_view_invert).unwrap_or(false);
         state.touchpad_hscroll_shift_apps = tv.and_then(|w| w.touchpad_hscroll_shift_apps.clone()).unwrap_or_default();
         state.osk_on_touch = tv.and_then(|w| w.osk_on_touch).unwrap_or(true);
     }
     state.display = config.display.clone();
     state.on_app_exit = config
         .window_manager
         .as_ref()
         .and_then(|wm| wm.on_app_exit.as_deref())
         .map(parse_on_app_exit)
         .unwrap_or(OnAppExit::FocusPrevious);
     state.center_on_spawn = config
         .window_manager
         .as_ref()
         .and_then(|wm| wm.center_on_spawn)
         .unwrap_or(true);
     state.rounded_apps = config
         .window_manager
         .as_ref()
         .and_then(|wm| wm.rounded_apps.clone())
         .unwrap_or_default();
     // Unset means "same apps as rounded_apps" — which deliberately excludes
     // the implicit cce-* set, since those draw their own bevels.
     state.bevel_apps = config
         .window_manager
         .as_ref()
         .and_then(|wm| wm.bevel_apps.clone())
         .unwrap_or_else(|| state.rounded_apps.clone());
 
     // Feed scenefx's rounded-corner shaders the DE-wide corner-shape exponent
     // (clamped like cce-ui's corner_shape()). Plain C state, safe pre-renderer
     // and on live reload.
     let corner_shape = config
         .window_manager
         .as_ref()
         .and_then(|wm| wm.corner_shape)
         .unwrap_or(2.0)
         .clamp(2.0, 16.0);
     unsafe {
         crate::ffi::fx_renderer_set_corner_shape(corner_shape as f32);
     }
     let span_factor = if corner_shape > 2.001 {
         (corner_shape - 1.0) * 2f64.powf(1.0 / corner_shape) / std::f64::consts::SQRT_2
     } else {
         1.0
     };
     CORNER_SPAN_FACTOR.store(span_factor.to_bits(), std::sync::atomic::Ordering::Relaxed);
 
     state.layout.gap = config.layout.gap as i32;
     state.layout.gap_top = config.layout.gap_top as i32;
     state.layout.gap_left = config.layout.gap_left as i32;
     state.layout.gap_right = config.layout.gap_right as i32;
     state.layout.gap_bottom = config.layout.gap_bottom as i32;
     state.layout.cascade_offset = config.layout.cascade_offset as i32;
     state.layout.bar_height = config.layout.bar_height as i32;
     state.layout.border_width = config.surface.border_width as i32;
     state.layout.fullscreen_border_width = 0;
     state.layout.cascade_border_width = 0;
     state.layout.grid_border_width = 0;
     state.layout.floating_border_width = 0;
 
     state.layout.border_color = parse_hex_color_rgba(&config.surface.border_color);
     state.layout.border_color_focused = config
         .surface
         .border_color_focused
         .as_deref()
         .map(parse_hex_color_rgba)
         .unwrap_or(state.layout.border_color);
     state.layout.border_color_hover = config
         .surface
         .border_color_hover
         .as_deref()
         .map(parse_hex_color_rgba)
         .unwrap_or_else(|| lighten_premultiplied(state.layout.border_color_focused, HOVER_LIGHTEN));
     state.layout.border_segment_gap = config.surface.border_segment_gap.max(0) as i32;
     // Clamped at 1: past that the corners would be THICKER than the middle,
     // which is the moulding inside out.
     state.layout.border_taper = config.surface.border_taper.clamp(0.05, 1.0) as f32;
     state.layout.border_handle_width = config.surface.border_handle_width.max(4.0) as f32;
     state.layout.border_overlap_opacity = config.surface.border_overlap_opacity.clamp(0.0, 1.0) as f32;
     // Capped at 2s: the close fade is a deadline a client blocks on before it
     // exits, so a mistyped 20000 would hang every quit for 20 seconds.
     state.layout.fade_in_ms = config.surface.fade_in_ms.clamp(0, 2000) as u32;
     state.layout.fade_out_ms = config.surface.fade_out_ms.clamp(0, 2000) as u32;
     state.layout.border_swell_curve = config.surface.border_swell_curve.clamp(0.1, 6.0) as f32;
     state.layout.border_corner_bulge = config.surface.border_corner_bulge.max(0.0) as f32;
     state.layout.border_corner_length = config.surface.border_corner_length.max(0) as i32;
 
     state.layout.desktop_gap_color = config.surface.desktop_gap_color.clone();
 
     let background_color_val = parse_hex_color(&config.surface.desktop_gap_color);
     state.layout.background_r = ((background_color_val >> 16) & 0xFF) * 0x01010101;
     state.layout.background_g = ((background_color_val >> 8) & 0xFF) * 0x01010101;
     state.layout.background_b = (background_color_val & 0xFF) * 0x01010101;
     state.layout.background_a = 0xFFFFFFFF;
 
     state.layout.desktop_cell_color = parse_hex_color_rgba(&config.surface.desktop_cell_color);
     state.layout.desktop_cell_width =
         config.surface.grid_cell_width.unwrap_or(config.surface.desktop_grid_scale) as f64;
     state.layout.desktop_cell_height =
         config.surface.grid_cell_height.unwrap_or(config.surface.desktop_grid_scale) as f64;
     state.layout.desktop_snap = config.surface.desktop_snap;
     state.layout.overview_anim = if config.surface.desktop_overview_ramp.is_empty() {
         None
     } else {
         match crate::policy::ramp::SpeedRamp::from_spec(&config.surface.desktop_overview_ramp) {
             Some(ramp) => Some((ramp, (config.surface.desktop_overview_ms.max(16)) as f64)),
             None => {
                 log::warn!("overview_ramp {:?} is invalid or all-zero; falling back to the exponential camera animation", config.surface.desktop_overview_ramp);
                 None
             }
         }
     };
     state.layout.desktop_snap_threshold = config.surface.desktop_snap_threshold.max(0) as f64;
     state.layout.desktop_edge_pan = config.surface.desktop_edge_pan;
     state.layout.desktop_edge_pan_band = config.surface.desktop_edge_pan_band.max(1) as f64;
     state.layout.desktop_edge_pan_speed = config.surface.desktop_edge_pan_speed.max(0) as f64;
     state.layout.desktop_gap_width = config.surface.desktop_gap_width as i32;
     state.layout.desktop_line_relief = if config.surface.desktop_line_relief < 0 {
         None
     } else {
         Some(config.surface.desktop_line_relief as f64)
     };
     state.layout.desktop_cell_fade_inset = config.surface.desktop_cell_fade_inset;
     state.layout.desktop_cell_labels = config.surface.desktop_cell_labels;
     state.layout.desktop_grid_fade_mode = config.surface.desktop_grid_fade_mode.clone();
 
     state.layout.border_font_size = 11;
     state.layout.transition_duration = config.layout.transition_duration as i32;
     state.layout.grid_gap = config.layout.grid_gap as i32;
     state.layout.border_blur = false;
     state.layout.window_blur = config.surface.root_plate_blur > 0.001;
     state.layout.root_plate_corner_radius = config.surface.root_plate_corner_radius as i32;
     state.layout.overlay_behavior = config.layout.overlay_behavior;
     state.layout.overlay_width = config.layout.overlay_width as i32;
     state.layout.overlay_position = config.layout.overlay_position;
     state.layout.overlay_border_gap = config.layout.overlay_border_gap as i32;
     state.layout.status_normal_color = config.layout.status_normal_color.clone();
     state.layout.status_background_blur = config.layout.status_background_blur as f32;
     state.layout.transparency_opacity = config.transparency.as_ref().and_then(|t| t.opacity).unwrap_or(0.9) as f32;
     let root_plate_rgba = parse_hex_color_rgba(&config.surface.root_plate_color);
     state.layout.window_opacity = root_plate_rgba[3] < 0.999;
     state.layout.scenefx_optimized_blur = config.output.as_ref().map(|o| o.scenefx_optimized_blur).unwrap_or(true);
     // Idle timeouts live on the server, not the window manager; a reload
     // re-arms them from now with the new figures.
     if !state.server.is_null() {
         unsafe { (*state.server).idle.configure(&config.idle); }
     }
     state.layout.status_backdrop_blur_ignore_transparent = config.layout.status_backdrop_blur_ignore_transparent;
     state.layout.window_backdrop_blur_ignore_transparent = config.layout.window_backdrop_blur_ignore_transparent;
     state.layout.status_module_hide_mode_preview = config.layout.status_module_hide_mode_preview;
     state.layout.status_module_spacing = config.layout.status_module_spacing;
     state.layout.status_droplet = config.layout.status_droplet.clone();
     state.layout.status_backdrop_compress = config.layout.status_backdrop_compress;
     state.layout.cloud_position_default = config.surface.cloud_position_default;
     state.layout.shadow_enabled = config.surface.shadow_enabled;
     state.layout.shadow_sigma = config.surface.shadow_sigma.max(0.0) as f32;
     state.layout.shadow_color = parse_hex_color_rgba(&config.surface.shadow_color);
     state.layout.shadow_offset_x = config.surface.shadow_offset_x as i32;
     state.layout.shadow_offset_y = config.surface.shadow_offset_y as i32;
     state.layout.shadow_tiled = config.surface.shadow_tiled;
     state.layout.bevel_enabled = config.surface.bevel_enabled;
     state.layout.bevel_thickness = config.surface.bevel_thickness.max(0.0) as f32;
     let (bevel_lx, bevel_ly) = parse_light_direction(&config.surface.bevel_light);
     state.layout.bevel_light_x = bevel_lx;
     state.layout.bevel_light_y = bevel_ly;
     state.layout.bevel_light_intensity = config.surface.bevel_light_intensity.clamp(0.0, 1.0) as f32;
     state.layout.bevel_shade_intensity = config.surface.bevel_shade_intensity.clamp(0.0, 1.0) as f32;
     state.layout.bevel_shoulder = config.surface.bevel_shoulder.clamp(0.0, 1.0) as f32;
     state.layout.bevel_color = parse_hex_color_rgba(&config.surface.bevel_color);
     let fc = parse_hex_color_rgba(&config.surface.bevel_focus_color);
     state.layout.bevel_focus_color = [fc[0], fc[1], fc[2]];
     // Clamped low at 1: below that the glint would spread WIDER than the
     // rim's own slope, which is what `thickness` is for.
     state.layout.bevel_focus_sharpness =
         config.surface.bevel_focus_sharpness.clamp(1.0, 64.0) as f32;
 
     for (key, val) in &config.env {
         let expanded = expand_env_vars(val);
         std::env::set_var(key, &expanded);
     }
 
     state.input_rules = config.device.clone();
     state.input_config = config.input.clone().unwrap_or_default();
     unsafe {
         // Config first (its per-class scroll factors are defaults), then the
         // name-based device rules so they stay the most specific override.
         state.apply_input_config();
         state.apply_input_rules();
     }
 
     state.keybinds.clear();
     let mut table = cce_window_manager::bindings::BindingTable::new();
     // Gesture entries from the same domain (`focus_left "swipe3_left"`);
     // they go ahead of config.kdl's `gesture_bind` nodes below.
     let mut input_gesture_binds: Vec<GestureBind> = Vec::new();
 
     // Primary source: the `cce-window-manager` domain of input.kdl.
     for entry in &wm_domain_entries {
         let Some(action) = Action::from_name(&entry.name) else {
             eprintln!("[WARNING] input.kdl: unknown window-manager action {:?}", entry.name);
             continue;
         };
         let command = match action {
             Action::Spawn | Action::Toggle => {
                 warn_if_command_missing(entry.command.as_deref());
                 entry.command.clone()
             }
             // Media-key actions have stock commands (policy-side
             // `media_command`); a `command=` property overrides.
             Action::VolumeUp | Action::VolumeDown | Action::VolumeMute | Action::MicMute
             | Action::BrightnessUp | Action::BrightnessDown => {
                 warn_if_command_missing(entry.command.as_deref());
                 entry.command.clone()
             }
             _ => None,
         };
         // A touchscreen edge swipe: `edge_left` fires on a finger swiped in
         // from the left edge (`touch::Claim::Edge`).
         if let Some((mods, edge)) = parse_edge_gesture(&entry.chord) {
             if input_gesture_binds.iter().any(|b| b.mods == mods && b.gesture_type == "edge" && b.direction == edge) {
                 eprintln!("[WARNING] input.kdl: {:?} is bound more than once", entry.chord);
             }
             input_gesture_binds.push(GestureBind {
                 mods,
                 gesture_type: "edge".to_string(),
                 fingers: 1,
                 direction: edge,
                 action,
                 command: command.clone(),
             });
             continue;
         }
         // A touchpad gesture rides in the chord slot: `swipe3_left`,
         // `super+pinch_out`. The fingerless spelling binds three AND four
         // fingers, as `toggle_overview "swipe_down"` always has.
         if let Some(g) = cce_window_manager::bindings::parse_gesture(&entry.chord) {
             let fingers: Vec<u32> = g.fingers.map(|n| vec![n]).unwrap_or_else(|| vec![3, 4]);
             for fingers in fingers {
                 let dup = input_gesture_binds.iter().any(|b| {
                     b.mods == g.mods && b.gesture_type == g.kind.as_str() && b.fingers == fingers && b.direction == g.direction
                 });
                 if dup {
                     eprintln!("[WARNING] input.kdl: {:?} is bound more than once", entry.chord);
                 }
                 input_gesture_binds.push(GestureBind {
                     mods: g.mods,
                     gesture_type: g.kind.as_str().to_string(),
                     fingers,
                     direction: g.direction.clone(),
                     action,
                     command: command.clone(),
                 });
             }
             continue;
         }
         let Some(chord) = cce_window_manager::bindings::parse_chord(&entry.chord) else {
             eprintln!("[WARNING] input.kdl: invalid chord {:?} for {}", entry.chord, entry.name);
             continue;
         };
         let keysym = parse_keysym(&chord.key);
         if keysym == 0 {
             eprintln!("[WARNING] input.kdl: unknown key {:?} in chord {:?}", chord.key, entry.chord);
             continue;
         }
         if table.add(Keybind { mods: chord.mods, keysym, action, command }) {
             eprintln!("[WARNING] input.kdl: {:?} is bound more than once", entry.chord);
         }
     }
 
     // Legacy sources: config.kdl `key_bindings` nodes (including the
     // synthesized brightness binds) and the `window_manager` section.
     // input.kdl wins on chord conflicts via add_default.
     let mut seen = std::collections::HashSet::new();
     for kb in &config.key_bindings {
         let (mods_str, key_str) = if kb.mods.is_empty() {
             if let Some(last_plus) = kb.key.rfind('+') {
                 (kb.key[..last_plus].to_string(), kb.key[last_plus+1..].to_string())
             } else {
                 ("".to_string(), kb.key.clone())
             }
         } else {
             (kb.mods.clone(), kb.key.clone())
         };
         let mods = parse_modifiers(&mods_str);
         let keysym = parse_keysym(&key_str);
 
         if !seen.insert((mods, keysym)) {
             eprintln!("[WARNING] Keybinding conflict: multiple actions mapped to mods={:?}, key={:?}", mods_str, key_str);
         }
 
         let action = parse_action(&kb.action);
         let command = if action == Action::Spawn || action == Action::Toggle {
             warn_if_command_missing(kb.command.as_deref());
             kb.command.clone()
         } else {
             None
         };
         table.add_default(Keybind { mods, keysym, action, command });
     }
 
     if let Some(ref wm_config) = config.window_manager {
         let wm_section_binds = [
             (&wm_config.close_window, Action::Close),
             (&wm_config.toggle_fullscreen, Action::Fullscreen),
             (&wm_config.window_switcher, Action::WindowSwitcher),
             (&wm_config.window_switcher_prev, Action::WindowSwitcherPrev),
         ];
         for (chord_str, action) in wm_section_binds {
             let Some(chord_str) = chord_str else { continue };
             if let Some(chord) = cce_window_manager::bindings::parse_chord(chord_str) {
                 let keysym = parse_keysym(&chord.key);
                 table.add_default(Keybind { mods: chord.mods, keysym, action, command: None });
             }
         }
     }
 
     // Stock defaults from the policy crate; never shadow configured chords.
     for d in cce_window_manager::bindings::DEFAULT_BINDINGS {
         let keysym = parse_keysym(d.key);
         table.add_default(Keybind { mods: d.mods, keysym, action: d.action, command: None });
     }
 
     state.keybinds = table.into_bindings();
 
     state.pointer_binds.clear();
     for pb in &config.pointer_bind {
         let mods = parse_modifiers(&pb.mods);
         let button = parse_button(&pb.button);
         let action = parse_action(&pb.action);
         state.pointer_binds.push(PointerBind {
             mods,
             button,
             action,
         });
     }
 
     // Gesture table, first match wins in the cursor's swipe/pinch handlers:
     // input.kdl entries, then config.kdl `gesture_bind` nodes, then the
     // legacy `window_manager { toggle_overview "swipe_down" }`.
     state.gesture_binds.clear();
     state.gesture_binds.extend(input_gesture_binds);
     for gb in &config.gesture_bind {
         let mods = gb.mods.as_ref().map(|m| parse_modifiers(m)).unwrap_or(0);
         let action = parse_action(&gb.action);
         let command = if action == Action::Spawn || action == Action::Toggle {
             gb.command.clone()
         } else {
             None
         };
         state.gesture_binds.push(GestureBind {
             mods,
             gesture_type: gb.gesture_type.clone(),
             fingers: gb.fingers,
             direction: gb.direction.clone(),
             action,
             command,
         });
     }
 
     if let Some(ref wm_config) = config.window_manager {
         if let Some(ref toggle_ov_str) = wm_config.toggle_overview {
             let normalized = toggle_ov_str.to_lowercase().replace('-', "_");
             let gesture_type = if normalized.starts_with("swipe") {
                 Some("swipe")
             } else if normalized.starts_with("pinch") {
                 Some("pinch")
             } else {
                 None
             };
             if let Some(g_type) = gesture_type {
                 let direction = normalized.trim_start_matches(g_type).trim_start_matches('_').to_string();
                 for fingers in [3, 4] {
                     state.gesture_binds.push(GestureBind {
                         mods: 0,
                         gesture_type: g_type.to_string(),
                         fingers,
                         direction: direction.clone(),
                         action: Action::Overview,
                         command: None,
                     });
                 }
             }
         }
     }
 
     state.mode_rules.clear();
     for rule in config.mode_rule {
         state.mode_rules.push(ModeRule {
             mode: parse_tiling_mode(&rule.mode),
             app_id_pattern: rule.app_id,
             title_pattern: rule.title,
             single_instance: rule.single.unwrap_or(false),
             tag: rule.tag.unwrap_or(-1) as i32,
             circular: rule.circular.unwrap_or(false),
             ssd: rule.ssd,
             over_sibling: rule.over_sibling.unwrap_or(false),
             center: rule.center.unwrap_or(false),
         });
     }
 
     for _tag_layout in config.tag_layout {
         // Tag layouts are ignored in the pannable coordinate system.
     }
 
     state.startup.clear();
     for st in config.startup {
         state.startup.push(st);
     }
 
     log::info!(
         "Parsed config: {} keybinds, {} pointer binds, {} gesture binds, {} startup programs",
         state.keybinds.len(),
         state.pointer_binds.len(),
         state.gesture_binds.len(),
         state.startup.len()
     );
 
     unsafe {
         if !state.server.is_null() {
             let outputs_head = &mut (*state.server).om.outputs as *mut crate::ffi::wl_list as *mut crate::server::WlList;
             let mut curr = (*outputs_head).next;
             while curr != outputs_head {
                 let next = (*curr).next;
                 let output = &mut *crate::container_of!(curr, crate::output::Output, link);
                 output.update_background_color();
                 curr = next;
             }
         }
     }
 
     Ok(())
 }
 
 #[cfg(test)]
 mod tests {
     use super::*;
 
     #[test]
     fn test_my_config() {
         if let Some(path) = default_config_path() {
             let mut server = crate::server::Server::default();
             parse_config(&path, &mut server.wm).unwrap();
             assert!(!server.wm.layout.desktop_gap_color.is_empty());
             assert!(server.wm.layout.desktop_gap_width >= 0);
             assert!(server.wm.layout.root_plate_corner_radius >= 0);
             println!("TEST_WM_STARTUP: {:?}", server.wm.startup);
             println!("TEST_WM_PATH: {:?}", std::env::var("PATH"));
         }
     }
 
     /// RFC Phase 7a: `plate { root ... }` is the one root-plate spelling; a
     /// legacy `root plate` node is ignored (its read-alias was removed
     /// 2026-09-06), so the defaults stand when only it is present.
     #[test]
     fn test_plate_root_canonical_spelling() {
         let canonical = r##"
 style {
     surface {
         plate {
             root color="#11223344" blur=0.5 corner_radius=21
         }
         backplate color="#ffffffff" blur=0.9 corner_radius=7
     }
 }
 "##;
         let config = parse_kdl_config(canonical).unwrap();
         assert_eq!(config.surface.root_plate_corner_radius, 21, "canonical read; legacy ignored");
         assert_eq!(config.surface.root_plate_color, "#11223344");
 
         // The child-node spelling of the same block — what cce-data-editor
         // writes and what a hand-kept config tends to grow into — reads the
         // same. Until 2026-09-28 it did not, and the compositor sat on its
         // default radius under root plates the apps drew at the config's.
         let children = r##"
 style {
     surface {
         plate {
             root {
                 blur (f64)0.1
                 color (rgba)"#5e657acf"
                 corner_radius (i64)24
             }
         }
     }
 }
 "##;
         let config = parse_kdl_config(children).unwrap();
         assert_eq!(config.surface.root_plate_corner_radius, 24, "child-node spelling");
         assert_eq!(config.surface.root_plate_color, "#5e657acf");
         assert!((config.surface.root_plate_blur - 0.1).abs() < 1e-9);
 
         // The legacy spelling alone is not read: the defaults stand.
         let legacy = r##"
 style {
     surface {
         backplate color="#55667788" corner_radius=9
     }
 }
 "##;
         let config = parse_kdl_config(legacy).unwrap();
         assert_eq!(config.surface.root_plate_corner_radius, default_root_plate_corner_radius(), "legacy spelling is not read");
         assert_eq!(config.surface.root_plate_color, default_root_plate_color());
     }
 
     #[test]
     fn test_parse_rgba() {
         let color = parse_hex_color_rgba("#a5cfc2");
         assert_eq!(color, [165.0/255.0, 207.0/255.0, 194.0/255.0, 1.0]);
     }
 
     #[test]
     fn test_kdl_display_scale_parsing() {
         let content = r#"
             output {
                 eDP-1 {
                     scale (f64)2.0
                     brightness_up (keybind)"XF86MonBrightnessUp"
                     brightness_down (keybind)"XF86MonBrightnessDown"
                     brightness_interval (i64)10
                 }
                 DP-1 {
                     scale (f64)1.5
                 }
             }
         "#;
         let config = parse_kdl_config(content).unwrap();
         assert_eq!(config.display.get("scale_eDP-1"), Some(&2.0));
         assert_eq!(config.display.get("scale_DP-1"), Some(&1.5));
         assert_eq!(config.display.get("mm_w_eDP-1"), None);
         assert_eq!(config.display.get("brightness_interval_eDP-1"), Some(&10.0));
 
         let up_bind = config.key_bindings.iter().find(|kb| kb.key == "XF86MonBrightnessUp").unwrap();
         assert_eq!(up_bind.action, "spawn");
         assert_eq!(up_bind.command, Some("brightnessctl set 10%+".to_string()));
 
         let down_bind = config.key_bindings.iter().find(|kb| kb.key == "XF86MonBrightnessDown").unwrap();
         assert_eq!(down_bind.action, "spawn");
         assert_eq!(down_bind.command, Some("brightnessctl set 10%-".to_string()));
     }
 
     #[test]
     fn test_kdl_display_size_mm_parsing() {
         let content = r#"
             output {
                 eDP-1 scale=(f64)2.0 size_mm="344x215"
                 DP-1 {
                     scale (f64)1.5
                     size_mm "597 336"
                 }
                 HDMI-A-1 size_mm="bogus"
             }
         "#;
         let config = parse_kdl_config(content).unwrap();
         assert_eq!(config.display.get("mm_w_eDP-1"), Some(&344.0));
         assert_eq!(config.display.get("mm_h_eDP-1"), Some(&215.0));
         assert_eq!(config.display.get("mm_w_DP-1"), Some(&597.0));
         assert_eq!(config.display.get("mm_h_DP-1"), Some(&336.0));
         assert_eq!(config.display.get("mm_w_HDMI-A-1"), None);
         assert_eq!(parse_size_mm("344,215"), Some((344.0, 215.0)));
         assert_eq!(parse_size_mm("344x0"), None);
         assert_eq!(parse_size_mm("1x2x3"), None);
     }
 
     #[test]
     fn test_kdl_window_manager_parsing() {
         let content = r#"
             "window_manager" {
                 close_window (keybind)"super+q"
                 toggle_fullscreen (keybind)"super+f"
                 toggle_overview ("menu:swipe_up,swipe_down,swipe_left,swipe_right,pinch_in,pinch_out")"swipe_up"
                 swipe_peek (f64)40.0
                 swipe_repeat_peek (f64)15.0
                 swipe_focus_cone (f64)30.0
                 swipe_threshold (f64)80.0
                 swipe_repeat_threshold (f64)200.0
             }
         "#;
         let config = parse_kdl_config(content).unwrap();
         assert!(config.window_manager.is_some());
         let wm = config.window_manager.unwrap();
         assert_eq!(wm.close_window, Some("super+q".to_string()));
         assert_eq!(wm.toggle_fullscreen, Some("super+f".to_string()));
         assert_eq!(wm.toggle_overview, Some("swipe_up".to_string()));
         assert_eq!(wm.swipe_peek, Some(40.0));
         assert_eq!(wm.swipe_repeat_peek, Some(15.0));
         assert_eq!(wm.swipe_focus_cone, Some(30.0));
         assert_eq!(wm.swipe_threshold, Some(80.0));
         assert_eq!(wm.swipe_repeat_threshold, Some(200.0));
         // Absent means "unset", which the apply step reads as the centring default.
         assert_eq!(wm.center_on_spawn, None);
     }
 
     #[test]
     fn test_kdl_window_manager_center_on_spawn() {
         let off = parse_kdl_config(
             r#"
             window_manager {
                 center_on_spawn (bool)false
             }
         "#,
         )
         .unwrap();
         assert_eq!(off.window_manager.unwrap().center_on_spawn, Some(false));
 
         let on = parse_kdl_config(
             r#"
             window_manager {
                 center_on_spawn (bool)true
             }
         "#,
         )
         .unwrap();
         assert_eq!(on.window_manager.unwrap().center_on_spawn, Some(true));
 
         // No window_manager block at all: nothing to read, and the apply step defaults on.
         assert!(parse_kdl_config("layout {\n gap 4\n}").unwrap().window_manager.is_none());
     }
 
     #[test]
     fn test_kdl_window_manager_rounded_apps() {
         let listed = parse_kdl_config(
             r#"
             window_manager {
                 rounded_apps "claude-desktop" "org.keepassxc.KeePassXC"
             }
         "#,
         )
         .unwrap();
         assert_eq!(
             listed.window_manager.unwrap().rounded_apps,
             Some(vec!["claude-desktop".to_string(), "org.keepassxc.KeePassXC".to_string()])
         );
 
         // Absent means "unset": the apply step reads it as an empty allowlist.
         let absent = parse_kdl_config(
             r#"
             window_manager {
                 center_on_spawn (bool)true
             }
         "#,
         )
         .unwrap();
         assert_eq!(absent.window_manager.unwrap().rounded_apps, None);
     }
 
     #[test]
     fn test_kdl_window_manager_corner_shape() {
         let set = parse_kdl_config(
             r#"
             window_manager {
                 corner_shape (f64)4.5
             }
         "#,
         )
         .unwrap();
         assert_eq!(set.window_manager.unwrap().corner_shape, Some(4.5));
 
         // Absent means "unset"; the apply step then feeds scenefx the circular default.
         let unset = parse_kdl_config("window_manager {\n center_on_spawn (bool)true\n}").unwrap();
         assert_eq!(unset.window_manager.unwrap().corner_shape, None);
     }
 
     #[test]
     fn test_kdl_input_device_classes_parsing() {
         let content = r#"
             input {
                 accel_profile "flat"
                 accel_speed (f64)1.0
                 scroll_factor (f64)1.0
                 scroll_ease (f64)9.5
                 kinetic_scroll (bool)false
                 scroll_friction (f64)4.0
                 mouse {
                     accel_speed (f64)0.5
                     scroll_factor (f64)2.0
                     scroll_method "button"
                 }
                 trackpad {
                     tap_to_click (bool)true
                     natural_scroll (bool)true
                     scroll_factor (f64)1.5
                     accel_speed (f64)0.9
                 }
                 trackpoint {
                     accel_speed (f64)0.4
                     accel_profile "adaptive"
                     scroll_factor (f64)3.0
                     scroll_method ("menu:none,button,two_finger,edge")"none"
                 }
             }
         "#;
         let config = parse_kdl_config(content).unwrap();
         let input = config.input.unwrap();
         assert_eq!(input.accel_profile, Some("flat".to_string()));
         assert_eq!(input.accel_speed, Some(1.0));
         assert_eq!(input.scroll_factor, Some(1.0));
         assert_eq!(input.scroll_ease, Some(9.5));
         assert_eq!(input.kinetic_scroll, Some(false));
         assert_eq!(input.scroll_friction, Some(4.0));
         let mouse = input.mouse.unwrap();
         assert_eq!(mouse.accel_speed, Some(0.5));
         assert_eq!(mouse.scroll_factor, Some(2.0));
         assert_eq!(mouse.scroll_method, Some("button".to_string()));
         // `trackpad` parses into the touchpad block (input.kdl spelling).
         let tp = input.touchpad.unwrap();
         assert_eq!(tp.tap_to_click, Some(true));
         assert_eq!(tp.natural_scroll, Some(true));
         assert_eq!(tp.scroll_factor, Some(1.5));
         assert_eq!(tp.accel_speed, Some(0.9));
         let tpoint = input.trackpoint.unwrap();
         assert_eq!(tpoint.accel_speed, Some(0.4));
         assert_eq!(tpoint.accel_profile, Some("adaptive".to_string()));
         assert_eq!(tpoint.scroll_factor, Some(3.0));
         // The annotated spelling the settings UI writes parses the same.
         assert_eq!(tpoint.scroll_method, Some("none".to_string()));
     }
 
     #[test]
     fn test_kdl_input_key_repeat() {
         let input = parse_kdl_config("input {\n repeat_rate 30\n repeat_delay 200\n}\n")
             .unwrap()
             .input
             .unwrap();
         assert_eq!(input.repeat_rate, Some(30));
         assert_eq!(input.repeat_delay, Some(200));
         assert_eq!(input.repeat_info(), (30, 200));
 
         // Unset keys fall back to the defaults; negatives clamp to 0.
         let input = parse_kdl_config("input {\n repeat_delay -5\n}\n").unwrap().input.unwrap();
         assert_eq!(
             input.repeat_info(),
             (crate::keyboard::DEFAULT_REPEAT_RATE, 0)
         );
         assert_eq!(
             InputConfig::default().repeat_info(),
             (crate::keyboard::DEFAULT_REPEAT_RATE, crate::keyboard::DEFAULT_REPEAT_DELAY)
         );
     }
 
     #[test]
     fn test_parse_edge_gesture() {
         assert_eq!(parse_edge_gesture("edge_left"), Some((0, "left".to_string())));
         assert_eq!(parse_edge_gesture("Edge-Bottom"), Some((0, "bottom".to_string())));
         assert_eq!(parse_edge_gesture("super+edge_top"), Some((0x40, "top".to_string())));
         assert_eq!(parse_edge_gesture("edge_middle"), None);
         assert_eq!(parse_edge_gesture("swipe3_left"), None);
         assert_eq!(parse_edge_gesture("super+t"), None);
     }
 
     #[test]
     fn test_kdl_osk_on_touch() {
         let off = parse_kdl_config("window_manager {\n osk_on_touch (bool)false\n}").unwrap();
         assert_eq!(off.window_manager.unwrap().osk_on_touch, Some(false));
         let unset = parse_kdl_config("window_manager {\n}").unwrap();
         assert_eq!(unset.window_manager.unwrap().osk_on_touch, None);
     }
 
     #[test]
     fn test_kdl_touchpad_hscroll_shift_apps() {
         let content = r#"
             window_manager {
                 touchpad_view_apps "Houdini FX"
                 touchpad_hscroll_shift_apps "Houdini FX" "hython*"
             }
         "#;
         let config = parse_kdl_config(content).unwrap();
         let wm = config.window_manager.unwrap();
         assert_eq!(wm.touchpad_view_apps, Some(vec!["Houdini FX".to_string()]));
         assert_eq!(wm.touchpad_hscroll_shift_apps, Some(vec!["Houdini FX".to_string(), "hython*".to_string()]));
         // Absent, the list is empty and the emulation is off.
         let config = parse_kdl_config("window_manager { }").unwrap();
         assert_eq!(config.window_manager.unwrap().touchpad_hscroll_shift_apps, None);
     }
 
     #[test]
     fn test_kdl_surface_border_parsing() {
         let content = r##"
             style {
                 surface {
                     border width=2 color="#ff8800" color_focused="#00ff88" color_hover="#88ffcc" segment_gap=6 corner_length=24
                 }
             }
         "##;
         let config = parse_kdl_config(content).unwrap();
         assert_eq!(config.surface.border_width, 2);
         assert_eq!(config.surface.border_color, "#ff8800");
         assert_eq!(config.surface.border_color_focused, Some("#00ff88".to_string()));
         assert_eq!(config.surface.border_color_hover, Some("#88ffcc".to_string()));
         assert_eq!(config.surface.border_segment_gap, 6);
         assert_eq!(config.surface.border_corner_length, 24);
 
         // Defaults keep borders off; the focused color falls back to `color`
         // and the hover color to a lightened focused color.
         let config = parse_kdl_config("").unwrap();
         assert_eq!(config.surface.border_width, 0);
         assert_eq!(config.surface.border_color_focused, None);
         assert_eq!(config.surface.border_color_hover, None);
         assert_eq!(config.surface.border_segment_gap, 4);
         assert_eq!(config.surface.border_corner_length, 0);
     }
 
     #[test]
     fn backdrop_compress_caps_light_text_and_floors_dark_text() {
         // White text at 4.5:1 caps the backdrop at (1.05 / 4.5) - 0.05.
         let (ceil, knee, invert) = backdrop_compress_params("#ffffff", 4.5).unwrap();
         assert!(!invert);
         assert!((ceil - 0.1833).abs() < 1e-3, "{ceil}");
         assert!((knee - ceil * 0.5).abs() < 1e-6);
         // Black text floors it at 4.5 * 0.05 - 0.05 = 0.175, a ceiling of
         // 0.825 in the inverted image.
         let (ceil, _, invert) = backdrop_compress_params("#000000", 4.5).unwrap();
         assert!(invert);
         assert!((ceil - 0.825).abs() < 1e-3, "{ceil}");
         // Off, or nothing to compress for.
         assert_eq!(backdrop_compress_params("#ffffff", 1.0), None);
         assert_eq!(backdrop_compress_params("#ffffff", 0.0), None);
         assert_eq!(backdrop_compress_params("nonsense", 4.5), None);
         // A ratio the color cannot reach clamps rather than going negative.
         let (ceil, _, _) = backdrop_compress_params("#808080", 21.0).unwrap();
         assert!(ceil > 0.0);
     }
 }