build: ignore release/ artifact directory

Previously, fallback window detection only checked user32.GetForegroundWindow().
If the user had YouTube Shorts open in Chrome on a second monitor or behind the terminal,
it was ignored.

Now check_for_distraction():
1. Checks the active foreground window first.
2. If not a distraction, scans all visible top-level desktop windows via find_window_by_match().
3. Immediately wakes the cat from sleeping or sitting if any distraction window is discovered.

.gitignore

@@ -8,8 +8,8 @@ env/
 venv/
 .venv/
 build/
-develop-eggs/
 dist/
+release/
 downloads/
 eggs/
 .eggs/

Catser.spec

@@ -0,0 +1,39 @@
+# -*- mode: python ; coding: utf-8 -*-
+
+
+a = Analysis(
+    ['run_catser.py'],
+    pathex=[],
+    binaries=[],
+    datas=[('catser/assets', 'catser/assets')],
+    hiddenimports=[],
+    hookspath=[],
+    hooksconfig={},
+    runtime_hooks=[],
+    excludes=[],
+    noarchive=False,
+    optimize=0,
+)
+pyz = PYZ(a.pure)
+
+exe = EXE(
+    pyz,
+    a.scripts,
+    a.binaries,
+    a.datas,
+    [],
+    name='Catser',
+    debug=False,
+    bootloader_ignore_signals=False,
+    strip=False,
+    upx=True,
+    upx_exclude=[],
+    runtime_tmpdir=None,
+    console=True,
+    disable_windowed_traceback=False,
+    argv_emulation=False,
+    target_arch=None,
+    codesign_identity=None,
+    entitlements_file=None,
+    icon=['catser.ico'],
+)

LICENSE

@@ -0,0 +1,22 @@
+MIT License
+
+Copyright (c) 2026 Catser Contributors
+Sprite assets courtesy of Workcat (https://workcat.app)
+
+Permission is hereby granted, free of charge, to any person obtaining a copy
+of this software and associated documentation files (the "Software"), to deal
+in the Software without restriction, including without limitation the rights
+to use, copy, modify, merge, publish, distribute, sublicense, and/or sell
+copies of the Software, and to permit persons to whom the Software is
+furnished to do so, subject to the following conditions:
+
+The above copyright notice and this permission notice shall be included in all
+copies or substantial portions of the Software.
+
+THE SOFTWARE IS PROVIDED "AS IS", WITHOUT WARRANTY OF ANY KIND, EXPRESS OR
+IMPLIED, INCLUDING BUT NOT LIMITED TO THE WARRANTIES OF MERCHANTABILITY,
+FITNESS FOR A PARTICULAR PURPOSE AND NONINFRINGEMENT. IN NO EVENT SHALL THE
+AUTHORS OR COPYRIGHT HOLDERS BE LIABLE FOR ANY CLAIM, DAMAGES OR OTHER
+LIABILITY, WHETHER IN AN ACTION OF CONTRACT, TORT OR OTHERWISE, ARISING FROM,
+OUT OF OR IN CONNECTION WITH THE SOFTWARE OR THE USE OR OTHER DEALINGS IN THE
+SOFTWARE.

README.md

@@ -29,9 +29,20 @@ A Windows desktop cat companion inspired by [Workcat](https://workcat.app/en/#ho
     $$\text{offset}_y = \text{height} \times 0.3874$$
   - Sprints diagonally across your screen to reach the close button, strikes it with its paw, and dispatches native `WM_CLOSE` to close the distracting app.
 
+- 🪟 **Window Platforming & Ledge Walking**:
+  - Treats the top frames of visible open application windows (browsers, editors, terminals) as physical platforms.
+  - Cat autonomously performs parabolic leaps onto window ledges, walks along them, sits, naps, and hops back down.
+  - Dynamic surface tracking: If an underlying window moves or closes while the cat is resting on it, the cat wakes up and falls under gravity to the next surface or floor.
+
+- 🖥️ **Dynamic Multi-Monitor & Resolution Detection**:
+  - Full virtual desktop support spanning all connected displays with arbitrary resolutions, positions, and DPI scaling.
+  - **Live Hotplug Detection**: Listens to Win32 `WM_DISPLAYCHANGE` and `WM_SETTINGCHANGE` system events (with a 1.5s background check) to dynamically detect when monitors are connected, disconnected, rearranged, or when display resolution/scaling changes.
+  - Automatically recalculates screen bounds and taskbar floors in real-time, clamping the cat into valid active displays so it never gets stranded off-screen.
+  - Seamlessly navigates elevation differences between monitors (e.g. stepping off higher floors into gravity falls, or leaping up steep monitor steps).
+
 - 🪟 **High-Performance Transparent Overlay**:
   - Built with Win32 Layered Windows (`WS_EX_LAYERED | WS_EX_TOPMOST | WS_EX_TOOLWINDOW | WS_EX_NOACTIVATE`).
-  - Uses `UpdateLayeredWindow` with 32-bit ARGB premultiplied alpha for clean anti-aliased fur edges, soft contact shadows, and tear-free 60 FPS rendering.
+  - Uses `UpdateLayeredWindow` with 32-bit ARGB premultiplied alpha (vectorized with numpy) for clean anti-aliased fur edges, soft contact shadows, and tear-free 60 FPS rendering.
   - Pixel-perfect hit-testing allows mouse clicks on transparent regions to pass through to your apps, while clicking the cat itself allows dragging and petting.
 
 ---
@@ -127,13 +138,19 @@ Catser/
 ## Technical Details
 
 ### Kinematic & Physics Constants
-Sourced directly from Workcat's engine (`apps/desktop/src/features/pet-mode/petModeData.ts` and `cat.js`):
+Sourced directly from Workcat's engine (`apps/desktop/src/features/pet-mode/petModeData.ts` and `cat.js`) and desktop physics kinematics:
 - `WALK_SPEED = 20.8` (stride = `26.0`, cadence = `0.9`)
 - `RUN_SPEED = 300.0` (stride = `72.0`)
 - `PAW_FPS = 24` (17 total frames, contact at index `14`)
 - `CONTACT_RATIO_X = (143.0 - 11.4) / 121.2 ≈ 1.0858`
 - `CONTACT_RATIO_Y = (40.0 - 4.2) / 92.4 ≈ 0.3874`
 - `ALERT_HOLD_MS = 620ms`
+- `GRAVITY = 1600.0 px/s²` (smooth parabolic acceleration during falls and jumps)
+- `JUMP_VELOCITY = 650.0 px/s` (dynamic trajectory calculation solving launch velocity $(v_x, v_y)$ for any elevation difference)
+
+### Window Platforming & Multi-Monitor Support
+- Uses Win32 `OpenInputDesktop` and `EnumDesktopWindows` to extract visible top frames of non-minimized desktop windows as physical ledges.
+- Tracks multi-display monitor geometries via `EnumDisplayMonitors` / `GetMonitorInfoW` to support arbitrary screen resolutions and vertical offsets.
 
 ### Win32 Window Closing
 On contact frame 14, Catser issues both `WM_CLOSE` (`0x0010`) and `WM_SYSCOMMAND / SC_CLOSE` (`0x0112 / 0xF060`) to the target window's handle (`HWND`), ensuring smooth closing across standard Win32 apps and Chromium browsers.

catser/activitywatch.py

@@ -169,57 +169,76 @@ class ActivityWatchClient:
         """Signals the background worker to exit."""
         self._running = False
 
-    def check_for_distraction(self) -> Optional[DistractionEvent]:
-        """
-        Checks current active window against distraction rules.
-        Uses ActivityWatch if available, otherwise falls back to native Win32.
-        """
-        app_name = ""
-        window_title = ""
-        active_window_info: Optional[WindowInfo] = None
-
-        # 1. Try ActivityWatch
-        aw_event = self.get_current_window_event()
-        if aw_event:
-            app_name = (aw_event.get("app") or "").lower()
-            window_title = aw_event.get("title") or ""
-
-            # Locate corresponding Win32 HWND for screen coordinates and close button
-            active_window_info = WindowManager.find_window_by_match(
-                title_predicate=lambda t: window_title.lower() in t.lower() or t.lower() in window_title.lower(),
-                process_predicate=lambda p: app_name in p.lower(),
-            )
-
-        # 2. Fallback to native Win32 if ActivityWatch is unavailable or HWND not found
-        if not active_window_info and self.config.auto_fallback_to_win32:
-            active_window_info = WindowManager.get_foreground_window_info()
-            if active_window_info:
-                app_name = active_window_info.process_name.lower()
-                window_title = active_window_info.title
-
-        if not active_window_info or not window_title:
-            return None
-
+    def _match_event(self, app_name: str, window_title: str, win_info: WindowInfo) -> Optional[DistractionEvent]:
+        """Evaluates a window title and process name against distraction rules."""
         title_lower = window_title.lower()
+        app_lower = app_name.lower()
 
-        # Check for title keyword matches (e.g. "shorts", "reels", "tiktok")
         for kw in self.config.distraction_keywords:
             if kw.lower() in title_lower:
                 return DistractionEvent(
                     app=app_name,
                     title=window_title,
                     matched_rule=f"keyword '{kw}'",
-                    window_info=active_window_info,
+                    window_info=win_info,
                 )
 
-        # Check for application process matches
         for target_app in self.config.distraction_apps:
-            if target_app.lower() in app_name:
+            if target_app.lower() in app_lower:
                 return DistractionEvent(
                     app=app_name,
                     title=window_title,
                     matched_rule=f"app '{target_app}'",
-                    window_info=active_window_info,
+                    window_info=win_info,
                 )
 
         return None
+
+    def check_for_distraction(self) -> Optional[DistractionEvent]:
+        """
+        Checks current active window and visible background windows against distraction rules.
+        Uses ActivityWatch if available, otherwise falls back to native Win32.
+        """
+        # 1. Try ActivityWatch (non-blocking read of cached event)
+        aw_event = self.get_current_window_event()
+        if aw_event:
+            app_name = (aw_event.get("app") or "").lower()
+            window_title = aw_event.get("title") or ""
+
+            active_window_info = WindowManager.find_window_by_match(
+                title_predicate=lambda t: window_title.lower() in t.lower() or t.lower() in window_title.lower(),
+                process_predicate=lambda p: app_name in p.lower(),
+            )
+            if active_window_info:
+                matched = self._match_event(app_name, window_title, active_window_info)
+                if matched:
+                    return matched
+
+        if not self.config.auto_fallback_to_win32:
+            return None
+
+        # 2. Native Win32: Check foreground window first
+        fg_info = WindowManager.get_foreground_window_info()
+        if fg_info and fg_info.title:
+            matched = self._match_event(fg_info.process_name, fg_info.title, fg_info)
+            if matched:
+                return matched
+
+        # 3. Native Win32: If foreground window is not a distraction, check any visible desktop window!
+        # This catches distraction windows open in the background, on a 2nd monitor, or when user clicks away
+        def title_matches(t: str) -> bool:
+            tl = t.lower()
+            return any(kw.lower() in tl for kw in self.config.distraction_keywords)
+
+        def app_matches(p: str) -> bool:
+            pl = p.lower()
+            return any(a.lower() in pl for a in self.config.distraction_apps)
+
+        matched_window = WindowManager.find_window_by_match(
+            title_predicate=title_matches if self.config.distraction_keywords else None,
+            process_predicate=app_matches if self.config.distraction_apps else None,
+        )
+        if matched_window and matched_window.title:
+            return self._match_event(matched_window.process_name, matched_window.title, matched_window)
+
+        return None

catser/app.py

@@ -48,13 +48,14 @@ class CatserApp:
 
         # 3. Transparent Overlay Window
         self.overlay = OverlayWindow(
-            width=self.config.cat_width,
-            height=self.config.cat_height,
-            initial_x=int(self.controller.x),
-            initial_y=int(self.controller.y),
+            width=self.config.canvas_width,
+            height=self.config.canvas_height,
+            initial_x=int(self.controller.x - self.config.pad_x),
+            initial_y=int(self.controller.y - self.config.pad_y),
             on_mouse_down=self.controller.on_mouse_down,
             on_mouse_move=self.controller.on_mouse_move,
             on_mouse_up=self.controller.on_mouse_up,
+            on_display_change=self.controller.refresh_display_bounds,
         )
 
         # 4. ActivityWatch Initial Ping
@@ -100,7 +101,11 @@ class CatserApp:
                 frame = self.controller.update(dt)
 
                 # 4. Update Layered Window Position & Pixels
-                self.overlay.draw_frame(frame, self.controller.x, self.controller.y)
+                self.overlay.draw_frame(
+                    frame,
+                    self.controller.x - self.config.pad_x,
+                    self.controller.y - self.config.pad_y,
+                )
 
                 # 5. Check duration limit
                 if max_seconds and (now - start_time >= max_seconds):

catser/assets_manager.py

@@ -14,6 +14,7 @@ Assets managed:
 """
 
 import os
+import sys
 import re
 import json
 import math
@@ -30,8 +31,11 @@ from .config import (
     LIFE_MOTION_FRAME_COUNT,
     CAT_BOX_WIDTH,
     CAT_BOX_HEIGHT,
+    GAIT_SHIFT_X,
+    GAIT_SHIFT_Y,
     Coat,
     COATS,
+    Config,
 )
 
 logger = logging.getLogger("catser.assets")
@@ -45,9 +49,12 @@ def _download_file(url: str, dest_path: Path) -> bool:
     Downloads a file with custom User-Agent to avoid Cloudflare 403 blocks.
     Returns True on success, False otherwise.
     """
-    dest_path.parent.mkdir(parents=True, exist_ok=True)
     if dest_path.exists() and dest_path.stat().st_size > 0:
         return True
+    try:
+        dest_path.parent.mkdir(parents=True, exist_ok=True)
+    except Exception:
+        pass
 
     try:
         req = urllib.request.Request(url, headers={"User-Agent": USER_AGENT})
@@ -80,10 +87,22 @@ class AssetsManager:
     Manages downloading, caching, rasterizing, and scaling of all cat sprites.
     """
 
-    def __init__(self, assets_dir: Optional[Path] = None, cat_width: int = 144):
-        self.assets_dir = assets_dir or (Path(__file__).parent / "assets")
-        self.cat_width = cat_width
-        self.cat_height = int(round(cat_width * (CAT_BOX_HEIGHT / CAT_BOX_WIDTH)))
+    def __init__(self, assets_dir: Optional[Path] = None, cat_width: int = 144, config: Optional[Config] = None):
+        if assets_dir:
+            self.assets_dir = assets_dir
+        elif getattr(sys, "frozen", False) and hasattr(sys, "_MEIPASS"):
+            mei_catser = Path(sys._MEIPASS) / "catser" / "assets"
+            self.assets_dir = mei_catser if mei_catser.exists() else (Path(sys._MEIPASS) / "assets")
+        else:
+            self.assets_dir = Path(__file__).parent / "assets"
+
+        self.config = config or Config(cat_width=cat_width)
+        self.cat_width = self.config.cat_width
+        self.cat_height = self.config.cat_height
+        self.canvas_width = self.config.canvas_width
+        self.canvas_height = self.config.canvas_height
+        self.pad_x = self.config.pad_x
+        self.pad_y = self.config.pad_y
         self.scale = self.cat_width / CAT_BOX_WIDTH
 
         # Memory cache for rendered frames keyed by (coat_name, frame_id, facing_left)
@@ -98,7 +117,10 @@ class AssetsManager:
 
     def initialize(self) -> None:
         """Downloads all missing assets and prepares raw frames."""
-        self.assets_dir.mkdir(parents=True, exist_ok=True)
+        try:
+            self.assets_dir.mkdir(parents=True, exist_ok=True)
+        except Exception:
+            pass
         self._ensure_assets_downloaded()
         self._load_raw_assets()
 
@@ -203,37 +225,41 @@ class AssetsManager:
 
         target_w = self.cat_width
         target_h = self.cat_height
+        canvas_w = self.canvas_width
+        canvas_h = self.canvas_height
+        pad_x = self.pad_x
+        pad_y = self.pad_y
 
         # 4× supersampling for clean anti-aliased polygon edges
         SS = 4
-        canvas_w = target_w * SS
-        canvas_h = target_h * SS
-        img = Image.new("RGBA", (canvas_w, canvas_h), (0, 0, 0, 0))
+        ss_w = canvas_w * SS
+        ss_h = canvas_h * SS
+        img = Image.new("RGBA", (ss_w, ss_h), (0, 0, 0, 0))
         draw = ImageDraw.Draw(img)
 
-        # The Workcat SVG walk frames use viewBox="0 0 150 120".
-        # Polygon coordinates span ~4–145 in X and ~8–112 in Y, fitting the viewBox.
-        # We simply map viewBox coords → supersampled canvas pixels.
-        # No GAIT_SHIFT or overcorrection needed: those are internal cat.js transforms
-        # that cancel out at the viewBox level.
+        # In Workcat:
+        # The SVG viewBox is 0 0 150 120, scaled to target_w x target_h,
+        # shifted by GAIT_SHIFT_X/Y relative to the cat unit (target_w / CAT_BOX_WIDTH),
+        # and placed with pad_x / pad_y inside the overlay canvas.
+        unit = (target_w / CAT_BOX_WIDTH) * SS
+        shift_x = pad_x * SS + GAIT_SHIFT_X * unit
+        shift_y = pad_y * SS + GAIT_SHIFT_Y * unit
         scale_x = (target_w / 150.0) * SS
         scale_y = (target_h / 120.0) * SS
 
         if self.walk_path_strings:
             pts = _parse_svg_polygon_points(self.walk_path_strings[frame_index])
-            ss_points = [(p[0] * scale_x, p[1] * scale_y) for p in pts]
+            ss_points = [(p[0] * scale_x + shift_x, p[1] * scale_y + shift_y) for p in pts]
             fur_rgba = (*coat.fur_color, 255)
             draw.polygon(ss_points, fill=fur_rgba)
 
-        # Face features — all coordinates in the same 150×120 viewBox space.
-        # Eyes: left at (120.4, 46.2), right at (140.3, 46.2), radius 2.2
-        # Mouth: W-shape centred around (131.6, 51.0)
+        # Face features — coordinates in 150x120 viewBox shifted into position
         ink_rgba = (*coat.ink_color, 255)
 
-        eye_l_cx = 120.4 * scale_x
-        eye_l_cy = 46.2  * scale_y
-        eye_r_cx = 140.3 * scale_x
-        eye_r_cy = 46.2  * scale_y
+        eye_l_cx = 120.4 * scale_x + shift_x
+        eye_l_cy = 46.2  * scale_y + shift_y
+        eye_r_cx = 140.3 * scale_x + shift_x
+        eye_r_cy = 46.2  * scale_y + shift_y
         eye_r    = 2.2   * scale_x
 
         if face_type == "open":
@@ -255,15 +281,15 @@ class AssetsManager:
             draw.arc([eye_l_cx - w_eye, eye_l_cy - h_eye, eye_l_cx + w_eye, eye_l_cy + h_eye], start=180, end=360, fill=ink_rgba, width=int(2 * SS))
             draw.arc([eye_r_cx - w_eye, eye_r_cy - h_eye, eye_r_cx + w_eye, eye_r_cy + h_eye], start=180, end=360, fill=ink_rgba, width=int(2 * SS))
 
-        mouth_cx = 131.6 * scale_x
-        mouth_cy = 51.0  * scale_y
+        mouth_cx = 131.6 * scale_x + shift_x
+        mouth_cy = 51.0  * scale_y + shift_y
         mw = 4.0 * scale_x
         mh = 2.5 * scale_y
         draw.arc([mouth_cx - mw, mouth_cy - mh, mouth_cx,      mouth_cy + mh], start=0, end=180, fill=ink_rgba, width=int(1.8 * SS))
         draw.arc([mouth_cx,      mouth_cy - mh, mouth_cx + mw, mouth_cy + mh], start=0, end=180, fill=ink_rgba, width=int(1.8 * SS))
 
-        # Downsample to target resolution with high-quality Lanczos resampling
-        final_img = img.resize((target_w, target_h), Image.Resampling.LANCZOS)
+        # Downsample to canvas resolution with high-quality Lanczos resampling
+        final_img = img.resize((canvas_w, canvas_h), Image.Resampling.LANCZOS)
 
         if facing_left:
             final_img = final_img.transpose(Image.Transpose.FLIP_LEFT_RIGHT)
@@ -271,7 +297,6 @@ class AssetsManager:
         self._cache[cache_key] = final_img
         return final_img
 
-
     def get_paw_frame(self, frame_index: int, coat: Coat, facing_left: bool = False) -> Image.Image:
         """
         Retrieves and tints a frame from the paw strike animation (f001-f017).
@@ -291,10 +316,10 @@ class AssetsManager:
         ph = int(round(self.cat_height * 0.96833))
         resized = tinted.resize((pw, ph), Image.Resampling.LANCZOS)
 
-        # Composite onto standard cat canvas with offsets
-        canvas = Image.new("RGBA", (self.cat_width, self.cat_height), (0, 0, 0, 0))
-        offset_x = int(round(self.cat_width * 0.02265))
-        offset_y = int(round(self.cat_height * -0.03083))
+        # Composite onto canvas with pad offsets
+        canvas = Image.new("RGBA", (self.canvas_width, self.canvas_height), (0, 0, 0, 0))
+        offset_x = self.pad_x + int(round(self.cat_width * 0.02265))
+        offset_y = self.pad_y + int(round(self.cat_height * -0.03083))
         canvas.paste(resized, (offset_x, offset_y), resized)
 
         if facing_left:
@@ -319,10 +344,9 @@ class AssetsManager:
         sh = int(round(self.cat_height * 1.29))
         resized = tinted.resize((sw, sh), Image.Resampling.LANCZOS)
 
-        # Center in canvas
-        canvas = Image.new("RGBA", (self.cat_width, self.cat_height), (0, 0, 0, 0))
-        ox = (self.cat_width - sw) // 2
-        oy = (self.cat_height - sh) // 2
+        canvas = Image.new("RGBA", (self.canvas_width, self.canvas_height), (0, 0, 0, 0))
+        ox = self.pad_x + (self.cat_width - sw) // 2
+        oy = self.pad_y + (self.cat_height - sh) // 2
         canvas.paste(resized, (ox, oy), resized)
 
         self._cache[cache_key] = canvas
@@ -331,7 +355,7 @@ class AssetsManager:
     def get_tail_frame(self, frame_index: int, coat: Coat, facing_left: bool = False) -> Image.Image:
         """
         Frame from the 37-frame tail flick life motion.
-        Geometry: left: -15.0564%, top: -14.2679%, width: 117.5657%, height: 115.3692%
+        Geometry from Workcat: left: -15.0564%, top: -14.2679%, width: 117.5657%, height: 115.3692%
         """
         frame_index = max(0, min(frame_index, len(self.tail_images) - 1)) if self.tail_images else 0
         cache_key = f"tail_{frame_index}_{coat.name}_{facing_left}"
@@ -345,9 +369,10 @@ class AssetsManager:
         th = int(round(self.cat_height * 1.153692))
         resized = tinted.resize((tw, th), Image.Resampling.LANCZOS)
 
-        canvas = Image.new("RGBA", (self.cat_width, self.cat_height), (0, 0, 0, 0))
-        ox = int(round(self.cat_width * -0.150564))
-        oy = int(round(self.cat_height * -0.142679))
+        # Composite onto padded canvas — tail extension is fully preserved
+        canvas = Image.new("RGBA", (self.canvas_width, self.canvas_height), (0, 0, 0, 0))
+        ox = self.pad_x + int(round(self.cat_width * -0.150564))
+        oy = self.pad_y + int(round(self.cat_height * -0.142679))
         canvas.paste(resized, (ox, oy), resized)
 
         if facing_left:
@@ -359,7 +384,7 @@ class AssetsManager:
     def get_stretch_frame(self, frame_index: int, coat: Coat, facing_left: bool = False) -> Image.Image:
         """
         Frame from the 37-frame stretch life motion.
-        Geometry: left: -4.5169%, top: 0.215%, width: 107.0263%, height: 100.8865%
+        Geometry from Workcat: left: -4.5169%, top: 0.215%, width: 107.0263%, height: 100.8865%
         """
         frame_index = max(0, min(frame_index, len(self.stretch_images) - 1)) if self.stretch_images else 0
         cache_key = f"stretch_{frame_index}_{coat.name}_{facing_left}"
@@ -373,9 +398,9 @@ class AssetsManager:
         sh = int(round(self.cat_height * 1.008865))
         resized = tinted.resize((sw, sh), Image.Resampling.LANCZOS)
 
-        canvas = Image.new("RGBA", (self.cat_width, self.cat_height), (0, 0, 0, 0))
-        ox = int(round(self.cat_width * -0.045169))
-        oy = int(round(self.cat_height * 0.00215))
+        canvas = Image.new("RGBA", (self.canvas_width, self.canvas_height), (0, 0, 0, 0))
+        ox = self.pad_x + int(round(self.cat_width * -0.045169))
+        oy = self.pad_y + int(round(self.cat_height * 0.00215))
         canvas.paste(resized, (ox, oy), resized)
 
         if facing_left:

catser/cat_controller.py

@@ -53,7 +53,7 @@ from .config import (
     LIFE_MOTION_FRAME_COUNT,
 )
 from .assets_manager import AssetsManager
-from .window_manager import WindowManager, WindowInfo
+from .window_manager import WindowManager, WindowInfo, WindowLedge
 
 logger = logging.getLogger("catser.controller")
 
@@ -72,6 +72,7 @@ class CatState(Enum):
     SLEEP = auto()
     STRETCH = auto()
     TAIL = auto()
+    JUMP = auto()
 
 
 class CatController:
@@ -83,30 +84,26 @@ class CatController:
         self.config = config
         self.assets = assets
 
-        # Primary monitor work area (excludes taskbar) – used for walk/roam floor clamping
-        work_area = WindowManager.get_work_area()
-        self.screen_left   = work_area[0]
-        self.screen_top    = work_area[1]
-        self.screen_right  = work_area[2]
-        self.screen_bottom = work_area[3]
-
-        # Full virtual desktop spanning ALL monitors – used for drag clamping so
-        # the user can pick up the cat and carry it to a second monitor.
-        vd = WindowManager.get_virtual_desktop_bounds()
-        self.vd_left   = vd[0]
-        self.vd_top    = vd[1]
-        self.vd_right  = vd[2]
-        self.vd_bottom = vd[3]
-
-        # Floor position: Cat walks on top of the taskbar / bottom of work area
-        self.floor_y = float(self.screen_bottom - self.config.cat_height)
+        # Dynamic display topology signature & periodic checker
+        self._current_display_signature = None
+        self.next_display_check_time = time.time() + 1.5
+        self.refresh_display_bounds(force=True)
 
         # Position & motion
         self.x = float(self.screen_left + 100)
+        self.floor_y = WindowManager.get_floor_y_at(self.x + self.config.cat_width * 0.5, self.config.cat_height)
         self.y = self.floor_y
         self.direction = 1.0       # 1.0 = right, -1.0 = left
         self.facing_left = False
-        self.lift = 0.0            # Height above floor in pixels
+        self.lift = 0.0            # Height above surface in pixels
+
+        # Physics velocities and window platforming state
+        self.vx = 0.0
+        self.vy = 0.0
+        self.target_landing_y = self.floor_y
+        self.current_ledge: Optional[WindowLedge] = None
+        self.target_jump_ledge: Optional[WindowLedge] = None
+        self.next_jump_check_time = time.time() + 4.0
 
         # State machine
         self.state = CatState.WALK
@@ -144,6 +141,62 @@ class CatController:
         self.walk_speed_px = (WALK_SPEED / config.cat_width) * (config.cat_width * 5.0)
         self.run_speed_px = (RUN_SPEED / config.cat_width) * (config.cat_width * 4.0)
 
+    def refresh_display_bounds(self, force: bool = False) -> bool:
+        """
+        Dynamically refreshes monitor geometries, virtual desktop boundaries,
+        and clamps cat position if display topology or resolution changed.
+        Returns True if a display change occurred, False otherwise.
+        """
+        new_signature = WindowManager.get_display_topology_signature()
+        if not force and new_signature == self._current_display_signature:
+            return False
+
+        self._current_display_signature = new_signature
+
+        # Update primary monitor work area (excludes taskbar)
+        work_area = WindowManager.get_work_area()
+        self.screen_left   = work_area[0]
+        self.screen_top    = work_area[1]
+        self.screen_right  = work_area[2]
+        self.screen_bottom = work_area[3]
+
+        # Update full virtual desktop spanning all monitors
+        vd = WindowManager.get_virtual_desktop_bounds()
+        self.vd_left   = vd[0]
+        self.vd_top    = vd[1]
+        self.vd_right  = vd[2]
+        self.vd_bottom = vd[3]
+
+        # Update horizontal roaming boundaries
+        self.min_x = float(self.vd_left + 15)
+        self.max_x = float(self.vd_right - self.config.cat_width - 15)
+
+        monitors = WindowManager.get_monitors()
+        logger.info(
+            f"Dynamic display configuration updated: {len(monitors)} monitor(s) detected, "
+            f"virtual desktop=({self.vd_left}, {self.vd_top}, {self.vd_right}, {self.vd_bottom}), "
+            f"primary work area={work_area}"
+        )
+
+        # Ensure the cat is not stranded outside newly active bounds
+        if hasattr(self, "x") and hasattr(self, "y"):
+            prev_x = self.x
+            self.x = max(self.min_x, min(self.max_x, self.x))
+
+            # Re-evaluate floor at current position
+            new_floor = WindowManager.get_floor_y_at(self.x + self.config.cat_width * 0.5, self.config.cat_height)
+            self.floor_y = new_floor
+
+            # If walking or resting on floor, adjust Y to new floor
+            if hasattr(self, "current_ledge") and not self.current_ledge:
+                if hasattr(self, "state") and self.state in (CatState.WALK, CatState.SIT, CatState.SLEEP, CatState.RELEASE):
+                    self.y = new_floor
+
+            if prev_x != self.x:
+                logger.info(f"Clamped cat X from {prev_x} to {self.x} due to display boundary change")
+
+        return True
+
     # ==========================================================================
     # State Transitions & Targeting
     # ==========================================================================
@@ -206,9 +259,9 @@ class CatController:
             dest_x = tx - w * CONTACT_RATIO_X
         dest_y = ty - h * CONTACT_RATIO_Y
 
-        # Clamp within desktop boundaries
-        dest_x = max(float(self.screen_left), min(float(self.screen_right - w), dest_x))
-        dest_y = max(float(self.screen_top), min(float(self.screen_bottom - h), dest_y))
+        # Clamp within virtual desktop boundaries so cat can attack across all monitors
+        dest_x = max(float(self.vd_left), min(float(self.vd_right - w), dest_x))
+        dest_y = max(float(self.vd_top), min(float(self.vd_bottom - h), dest_y))
 
         self.run_start_pos = (self.x, self.y)
         self.run_target_pos = (dest_x, dest_y)
@@ -220,6 +273,46 @@ class CatController:
 
         self.set_state(CatState.RUN)
 
+    def _initiate_jump(self, target_x: float, target_y: float, target_ledge: Optional[WindowLedge] = None) -> None:
+        """
+        Initiates a parabolic jump trajectory to land at (target_x, target_y).
+        Dynamically calculates launch velocities (vx, vy) based on gravity and elevation difference.
+        """
+        g = self.config.gravity_px_s2
+        delta_y = self.y - target_y  # positive if jumping UP to higher elevation
+        delta_x = target_x - self.x
+
+        if delta_y > 0:
+            # Jumping UP to higher elevation (lower Y coordinate)
+            apex_margin = 30.0
+            vy0 = -math.sqrt(2.0 * g * (delta_y + apex_margin))
+            t_up = -vy0 / g
+            t_down = math.sqrt((2.0 * apex_margin) / g)
+            t_flight = max(0.25, t_up + t_down)
+        else:
+            # Jumping DOWN or hopping horizontally
+            vy0 = -180.0  # slight upward launch hop
+            apex_margin = (vy0 * vy0) / (2.0 * g)
+            t_up = -vy0 / g
+            fall_dist = abs(delta_y) + apex_margin
+            t_down = math.sqrt((2.0 * fall_dist) / g)
+            t_flight = max(0.25, t_up + t_down)
+
+        self.vx = delta_x / t_flight
+        self.vy = vy0
+        self.target_landing_y = target_y
+        self.target_jump_ledge = target_ledge
+        self.current_ledge = None
+
+        if self.vx < -10.0:
+            self.facing_left = True
+            self.direction = -1.0
+        elif self.vx > 10.0:
+            self.facing_left = False
+            self.direction = 1.0
+
+        self.set_state(CatState.JUMP)
+
     def _trigger_paw_strike(self) -> None:
         """Starts the 17-frame paw swipe animation at 24fps."""
         self.set_state(CatState.PAW)
@@ -258,15 +351,18 @@ class CatController:
             # self.vd_* covers the combined bounds of all connected displays.
             self.x = max(float(self.vd_left), min(float(self.vd_right  - self.config.cat_width),  new_x))
             self.y = max(float(self.vd_top),  min(float(self.vd_bottom - self.config.cat_height), new_y))
-            self.lift = max(0.0, self.floor_y - self.y)
+            surface_y = WindowManager.get_surface_beneath(self.x, self.y, self.config.cat_width, self.config.cat_height)
+            self.lift = max(0.0, surface_y - self.y)
 
     def on_mouse_up(self, cursor_x: int, cursor_y: int) -> None:
         """Handles drop after dragging or petting click."""
         if self.state == CatState.DRAG:
             # Drop the cat with gravity
             self.set_state(CatState.FALL)
-            self.fall_start_y = self.y
-            self.fall_duration = max(0.2, min(0.6, math.sqrt((self.floor_y - self.y) / 500.0)))
+            self.vy = 0.0
+            self.current_ledge = None
+            surface_y = WindowManager.get_surface_beneath(self.x, self.y, self.config.cat_width, self.config.cat_height)
+            self.target_landing_y = surface_y
         elif self.state != CatState.PAW:
             # Clicked without dragging -> Pet the cat!
             self.set_state(CatState.HAPPY)
@@ -294,8 +390,13 @@ class CatController:
 
         face_type = "happy" if self.state == CatState.HAPPY else ("blink" if self.is_blinking else "open")
 
+        # Dynamic check for monitor addition/removal, resolution or work-area change
+        if now >= self.next_display_check_time:
+            self.next_display_check_time = now + 1.5
+            self.refresh_display_bounds()
+
         # ----------------------------------------------------------------------
-        # State: WALK (roaming the desktop floor)
+        # State: WALK (roaming desktop floors and window ledges)
         # ----------------------------------------------------------------------
         if self.state == CatState.WALK:
             elapsed = now - self.walk_start_time
@@ -303,18 +404,95 @@ class CatController:
             fps = (GAIT_FRAME_COUNT * WALK_SPEED * GAIT_CADENCE) / WALK_STRIDE  # ~21.6 fps
             frame_idx = int(elapsed * fps) % max(len(self.assets.walk_path_strings), 1)
 
-            # Move horizontally
-            step = self.direction * self.walk_speed_px * dt
-            self.x += step
+            cat_center_x = self.x + self.config.cat_width * 0.5
 
-            # Bounce at screen edges
-            margin = 15.0
-            if self.x >= self.screen_right - self.config.cat_width - margin:
-                self.x = self.screen_right - self.config.cat_width - margin
+            # 1. Platform Ledge Navigation (cat is walking on top of an app window)
+            if self.current_ledge:
+                # If cat stepped off ledge boundaries or window moved/disappeared:
+                if cat_center_x < self.current_ledge.left - 15.0 or cat_center_x > self.current_ledge.right + 15.0:
+                    self.current_ledge = None
+                    self.vy = 50.0
+                    self.target_landing_y = WindowManager.get_surface_beneath(self.x, self.y, self.config.cat_width, self.config.cat_height)
+                    self.set_state(CatState.FALL)
+                else:
+                    # Move along ledge
+                    step = self.direction * self.walk_speed_px * dt
+                    self.x += step
+
+                    # Ledge edge turnaround
+                    ledge_margin = 20.0
+                    if self.x >= self.current_ledge.right - self.config.cat_width - ledge_margin:
+                        self.x = self.current_ledge.right - self.config.cat_width - ledge_margin
+                        self.direction = -1.0
+                        self.facing_left = True
+                    elif self.x <= self.current_ledge.left + ledge_margin:
+                        self.x = self.current_ledge.left + ledge_margin
+                        self.direction = 1.0
+                        self.facing_left = False
+
+                    # Periodically consider jumping down from window ledge
+                    if now >= self.next_jump_check_time:
+                        self.next_jump_check_time = now + random.uniform(5.0, 10.0)
+                        if random.random() < 0.35:
+                            hop_x = self.x + self.direction * 90.0
+                            floor_beneath = WindowManager.get_floor_y_at(hop_x + self.config.cat_width * 0.5, self.config.cat_height)
+                            self._initiate_jump(target_x=hop_x, target_y=floor_beneath)
+
+            # 2. Floor Navigation (across all monitors)
+            else:
+                current_floor = WindowManager.get_floor_y_at(cat_center_x, self.config.cat_height)
+
+                # Check if floor dropped out underneath (e.g. stepped from primary to lower secondary monitor)
+                if current_floor > self.y + 40.0:
+                    self.target_landing_y = current_floor
+                    self.vy = 50.0
+                    self.set_state(CatState.FALL)
+                else:
+                    # Check if there is an elevation step-up ahead (e.g. secondary to higher primary monitor)
+                    ahead_x = cat_center_x + (self.direction * 60.0)
+                    floor_ahead = WindowManager.get_floor_y_at(ahead_x, self.config.cat_height)
+                    if floor_ahead < self.y - 40.0:
+                        # Step-up detected! Leap onto the higher monitor floor
+                        jump_target_x = ahead_x + self.direction * 50.0
+                        self._initiate_jump(target_x=jump_target_x, target_y=floor_ahead)
+                    else:
+                        # Standard walking along floor
+                        step = self.direction * self.walk_speed_px * dt
+                        self.x += step
+
+                        # Snap Y to current monitor floor
+                        self.y = current_floor
+                        self.floor_y = current_floor
+
+                        # Check autonomous window jump
+                        if self.config.enable_window_platforms and now >= self.next_jump_check_time:
+                            self.next_jump_check_time = now + random.uniform(3.5, 7.5)
+                            if random.random() < self.config.platform_jump_chance:
+                                ledges = WindowManager.get_window_ledges()
+                                reachable = []
+                                for ledge in ledges:
+                                    height_diff = (self.y + self.config.cat_height) - ledge.top_y
+                                    if 60.0 <= height_diff <= 380.0:
+                                        if self.direction > 0 and (ledge.left <= cat_center_x + 350.0 and ledge.right >= cat_center_x):
+                                            reachable.append(ledge)
+                                        elif self.direction < 0 and (ledge.right >= cat_center_x - 350.0 and ledge.left <= cat_center_x):
+                                            reachable.append(ledge)
+                                if reachable:
+                                    chosen_ledge = random.choice(reachable)
+                                    min_lx = chosen_ledge.left + 20.0
+                                    max_lx = chosen_ledge.right - self.config.cat_width - 20.0
+                                    if max_lx >= min_lx:
+                                        target_lx = max(min_lx, min(max_lx, self.x + self.direction * 120.0))
+                                        target_ly = float(chosen_ledge.top_y - self.config.cat_height)
+                                        self._initiate_jump(target_x=target_lx, target_y=target_ly, target_ledge=chosen_ledge)
+
+            # Bounce at virtual desktop outer boundaries
+            if self.x >= self.max_x:
+                self.x = self.max_x
                 self.direction = -1.0
                 self.facing_left = True
-            elif self.x <= self.screen_left + margin:
-                self.x = self.screen_left + margin
+            elif self.x <= self.min_x:
+                self.x = self.min_x
                 self.direction = 1.0
                 self.facing_left = False
 
@@ -377,10 +555,10 @@ class CatController:
 
             # End of paw sequence
             if frame_idx >= PAW_FRAME_COUNT:
-                # Settle and fall back to floor
+                # Settle and fall back to surface beneath
                 self.set_state(CatState.FALL)
-                self.fall_start_y = self.y
-                self.fall_duration = max(0.2, math.sqrt(max(0.1, self.floor_y - self.y) / 400.0))
+                self.vy = 0.0
+                self.current_ledge = None
                 return self.assets.get_paw_frame(0, coat, self.facing_left)
 
             img = self.assets.get_paw_frame(frame_idx, coat, self.facing_left)
@@ -397,20 +575,65 @@ class CatController:
         # State: FALL (gravity drop after drag or jumping)
         # ----------------------------------------------------------------------
         elif self.state == CatState.FALL:
-            elapsed = now - self.state_start_time
-            t = min(1.0, elapsed / max(0.01, self.fall_duration))
-            # Quadratic acceleration (gravity)
-            self.y = self.fall_start_y + (self.floor_y - self.fall_start_y) * (t * t)
-            self.lift = max(0.0, self.floor_y - self.y)
+            self.vy += self.config.gravity_px_s2 * dt
+            self.y += self.vy * dt
 
-            if t >= 1.0:
-                self.y = self.floor_y
+            # Target landing surface directly beneath
+            surface_y = WindowManager.get_surface_beneath(self.x, self.y, self.config.cat_width, self.config.cat_height)
+            self.lift = max(0.0, surface_y - self.y)
+
+            if self.y >= surface_y:
+                self.y = surface_y
+                self.vy = 0.0
                 self.lift = 0.0
+                self.floor_y = self.y
+                self.current_ledge = None
+
+                # Check if landed on a window ledge
+                cat_center_x = self.x + self.config.cat_width * 0.5
+                if self.config.enable_window_platforms:
+                    for ledge in WindowManager.get_window_ledges():
+                        if abs((self.y + self.config.cat_height) - ledge.top_y) <= 20.0 and (ledge.left <= cat_center_x <= ledge.right):
+                            self.current_ledge = ledge
+                            break
+
                 self.set_state(CatState.RELEASE)
 
             img = self.assets.get_paw_frame(0, coat, self.facing_left)
             return self._composite_with_shadow(img, self.lift)
 
+        # ----------------------------------------------------------------------
+        # State: JUMP (parabolic leap onto window ledge or between monitors)
+        # ----------------------------------------------------------------------
+        elif self.state == CatState.JUMP:
+            self.x += self.vx * dt
+            self.y += self.vy * dt
+            self.vy += self.config.gravity_px_s2 * dt
+
+            # Clamp within virtual desktop horizontally
+            self.x = max(self.min_x, min(self.max_x, self.x))
+
+            # Lift relative to target landing surface
+            self.lift = max(0.0, self.target_landing_y - self.y)
+
+            # Check landing condition when falling downwards
+            if self.vy > 0 and self.y >= self.target_landing_y:
+                self.y = self.target_landing_y
+                self.vy = 0.0
+                self.vx = 0.0
+                self.lift = 0.0
+                self.floor_y = self.y
+                self.current_ledge = self.target_jump_ledge
+                self.target_jump_ledge = None
+                self.set_state(CatState.RELEASE)
+
+            # Sprite: Reaching paw stance while ascending, landing walk stance while descending
+            if self.vy < 0:
+                img = self.assets.get_paw_frame(0, coat, self.facing_left)
+            else:
+                img = self.assets.get_walk_frame(1, coat, self.facing_left, face_type)
+            return self._composite_with_shadow(img, self.lift)
+
         # ----------------------------------------------------------------------
         # State: RELEASE (landing settle after falling)
         # ----------------------------------------------------------------------
@@ -437,11 +660,11 @@ class CatController:
             heart_alpha = 1.0 - progress
             heart = self.assets.get_heart_particle(size=28, alpha=heart_alpha)
 
-            canvas = Image.new("RGBA", (self.config.cat_width, self.config.cat_height), (0, 0, 0, 0))
+            canvas = Image.new("RGBA", (self.config.canvas_width, self.config.canvas_height), (0, 0, 0, 0))
             canvas.paste(base, (0, 0), base)
             # Heart floats upwards
-            hx = int(self.config.cat_width * 0.65)
-            hy = int(self.config.cat_height * 0.15 - progress * 20.0)
+            hx = self.config.pad_x + int(self.config.cat_width * 0.65)
+            hy = self.config.pad_y + int(self.config.cat_height * 0.15 - progress * 20.0)
             canvas.paste(heart, (hx, max(0, hy)), heart)
             return self._composite_with_shadow(canvas, 0.0)
 
@@ -449,9 +672,15 @@ class CatController:
         # State: SIT (sitting idle)
         # ----------------------------------------------------------------------
         elif self.state == CatState.SIT:
-            elapsed = now - self.state_start_time
-            if elapsed >= self.settle_duration:
-                self.set_state(CatState.WALK)
+            surface_y = WindowManager.get_surface_beneath(self.x, self.y, self.config.cat_width, self.config.cat_height)
+            if surface_y > self.y + 35.0:
+                self.current_ledge = None
+                self.vy = 50.0
+                self.set_state(CatState.FALL)
+            else:
+                elapsed = now - self.state_start_time
+                if elapsed >= self.settle_duration:
+                    self.set_state(CatState.WALK)
             # Sitting stance using walk frame 0
             img = self.assets.get_walk_frame(0, coat, self.facing_left, face_type)
             return self._composite_with_shadow(img, 0.0)
@@ -460,17 +689,23 @@ class CatController:
         # State: SLEEP (sleeping with 'z' snoring)
         # ----------------------------------------------------------------------
         elif self.state == CatState.SLEEP:
-            elapsed = now - self.state_start_time
-            if elapsed >= self.settle_duration:
-                self.set_state(CatState.WALK)
+            surface_y = WindowManager.get_surface_beneath(self.x, self.y, self.config.cat_width, self.config.cat_height)
+            if surface_y > self.y + 35.0:
+                self.current_ledge = None
+                self.vy = 50.0
+                self.set_state(CatState.FALL)
+            else:
+                elapsed = now - self.state_start_time
+                if elapsed >= self.settle_duration:
+                    self.set_state(CatState.WALK)
 
             base = self.assets.get_walk_frame(0, coat, self.facing_left, "blink")
             # Animated zzz particle
             zzz = self.assets.get_zzz_indicator(size=22)
-            canvas = Image.new("RGBA", (self.config.cat_width, self.config.cat_height), (0, 0, 0, 0))
+            canvas = Image.new("RGBA", (self.config.canvas_width, self.config.canvas_height), (0, 0, 0, 0))
             canvas.paste(base, (0, 0), base)
-            zx = int(self.config.cat_width * 0.65)
-            zy = int(self.config.cat_height * 0.10 + math.sin(elapsed * 2.0) * 4.0)
+            zx = self.config.pad_x + int(self.config.cat_width * 0.65)
+            zy = self.config.pad_y + int(self.config.cat_height * 0.10 + math.sin(elapsed * 2.0) * 4.0)
             canvas.paste(zzz, (zx, max(0, zy)), zzz)
             return self._composite_with_shadow(canvas, 0.0)
 
@@ -478,11 +713,17 @@ class CatController:
         # State: STRETCH (37 frames stretch)
         # ----------------------------------------------------------------------
         elif self.state == CatState.STRETCH:
-            elapsed = now - self.state_start_time
-            frame_idx = int(elapsed * LIFE_MOTION_FPS)
-            if frame_idx >= LIFE_MOTION_FRAME_COUNT:
-                self.set_state(CatState.WALK)
-                return self.assets.get_walk_frame(0, coat, self.facing_left, face_type)
+            surface_y = WindowManager.get_surface_beneath(self.x, self.y, self.config.cat_width, self.config.cat_height)
+            if surface_y > self.y + 35.0:
+                self.current_ledge = None
+                self.vy = 50.0
+                self.set_state(CatState.FALL)
+            else:
+                elapsed = now - self.state_start_time
+                frame_idx = int(elapsed * LIFE_MOTION_FPS)
+                if frame_idx >= LIFE_MOTION_FRAME_COUNT:
+                    self.set_state(CatState.WALK)
+                    return self.assets.get_walk_frame(0, coat, self.facing_left, face_type)
 
             img = self.assets.get_stretch_frame(frame_idx, coat, self.facing_left)
             return self._composite_with_shadow(img, 0.0)
@@ -491,11 +732,17 @@ class CatController:
         # State: TAIL (37 frames tail flick)
         # ----------------------------------------------------------------------
         elif self.state == CatState.TAIL:
-            elapsed = now - self.state_start_time
-            frame_idx = int(elapsed * LIFE_MOTION_FPS)
-            if frame_idx >= LIFE_MOTION_FRAME_COUNT:
-                self.set_state(CatState.WALK)
-                return self.assets.get_walk_frame(0, coat, self.facing_left, face_type)
+            surface_y = WindowManager.get_surface_beneath(self.x, self.y, self.config.cat_width, self.config.cat_height)
+            if surface_y > self.y + 35.0:
+                self.current_ledge = None
+                self.vy = 50.0
+                self.set_state(CatState.FALL)
+            else:
+                elapsed = now - self.state_start_time
+                frame_idx = int(elapsed * LIFE_MOTION_FPS)
+                if frame_idx >= LIFE_MOTION_FRAME_COUNT:
+                    self.set_state(CatState.WALK)
+                    return self.assets.get_walk_frame(0, coat, self.facing_left, face_type)
 
             img = self.assets.get_tail_frame(frame_idx, coat, self.facing_left)
             return self._composite_with_shadow(img, 0.0)
@@ -543,14 +790,14 @@ class CatController:
 
     def _composite_with_shadow(self, sprite: Image.Image, lift: float) -> Image.Image:
         """Draws soft contact shadow underneath the cat sprite."""
-        w = self.config.cat_width
-        h = self.config.cat_height
+        w = self.config.canvas_width
+        h = self.config.canvas_height
         canvas = Image.new("RGBA", (w, h), (0, 0, 0, 0))
 
-        lift_ratio = min(1.0, lift / max(1.0, self.floor_y))
-        shadow = self.assets.get_shadow(w, lift_ratio)
-        sx = (w - shadow.width) // 2
-        sy = h - shadow.height - 1
+        lift_ratio = min(1.0, max(0.0, lift / 250.0))
+        shadow = self.assets.get_shadow(self.config.cat_width, lift_ratio)
+        sx = self.config.pad_x + (self.config.cat_width - shadow.width) // 2
+        sy = self.config.pad_y + self.config.cat_height - shadow.height - 1
         canvas.paste(shadow, (sx, sy), shadow)
 
         # Cat sprite on top
@@ -559,12 +806,10 @@ class CatController:
 
     def _composite_with_alert(self, sprite: Image.Image) -> Image.Image:
         """Paints alert exclamation mark bubble above the cat's head."""
-        w = self.config.cat_width
-        h = self.config.cat_height
         canvas = self._composite_with_shadow(sprite, 0.0)
 
         alert_bubble = self.assets.get_alert_bubble(size=30)
-        ax = int(w * 0.70) if not self.facing_left else int(w * 0.05)
-        ay = 2
+        ax = self.config.pad_x + (int(self.config.cat_width * 0.70) if not self.facing_left else int(self.config.cat_width * 0.05))
+        ay = self.config.pad_y + 2
         canvas.paste(alert_bubble, (ax, ay), alert_bubble)
         return canvas

catser/config.py

@@ -62,10 +62,10 @@ ACTION_WEIGHTS: Dict[str, Dict[str, int]] = {
 # Settled action intervals (ms)
 LIFE_ACTION_INTERVAL_MS: int = 9000
 SETTLED_ACTION_INTERVAL_MS: int = 3400
-SIT_MIN_MS: int = 3200
-SIT_MAX_MS: int = 9000
-SLEEP_MIN_MS: int = 6400
-SLEEP_MAX_MS: int = 18000
+SIT_MIN_MS: int = 15000
+SIT_MAX_MS: int = 45000
+SLEEP_MIN_MS: int = 60000    # 1 to 4 minutes of peaceful sleep
+SLEEP_MAX_MS: int = 240000
 
 
 # ==============================================================================
@@ -118,12 +118,15 @@ class Config:
     auto_fallback_to_win32: bool = True
     distraction_keywords: List[str] = field(default_factory=lambda: [
         "shorts",
-        "youtube shorts",
+        "youtube.com/shorts",
+        "youtube",
         "reels",
-        "instagram reels",
+        "instagram.com/reels",
+        "instagram",
         "tiktok",
         "reddit",
         "twitch.tv",
+        "twitch",
     ])
     distraction_apps: List[str] = field(default_factory=lambda: [
         # Users can add specific processes e.g. "discord.exe", "steam.exe"
@@ -134,6 +137,12 @@ class Config:
     sound_enabled: bool = True
     cooldown_after_close_sec: float = 4.0
 
+    # Physics & Platforming parameters
+    gravity_px_s2: float = 1600.0          # Gravitational acceleration (px/s^2)
+    jump_velocity_px_s: float = 650.0      # Vertical launch velocity for jumps (px/s)
+    platform_jump_chance: float = 0.20     # Autonomous chance to jump onto a window platform
+    enable_window_platforms: bool = True   # Treat open windows as walkable ledges
+
     @property
     def cat_height(self) -> int:
         """Calculates cat height proportionally based on aspect ratio 121.2 / 92.4."""

catser/overlay.py

@@ -76,6 +76,8 @@ WM_LBUTTONDOWN = 0x0201
 WM_LBUTTONUP = 0x0202
 WM_MOUSEMOVE = 0x0200
 WM_NCHITTEST = 0x0084
+WM_DISPLAYCHANGE = 0x007E
+WM_SETTINGCHANGE = 0x001A
 
 # Cursors
 IDC_ARROW = 32512
@@ -187,6 +189,7 @@ class OverlayWindow:
         on_mouse_down: Optional[Callable[[int, int], None]] = None,
         on_mouse_move: Optional[Callable[[int, int], None]] = None,
         on_mouse_up: Optional[Callable[[int, int], None]] = None,
+        on_display_change: Optional[Callable[[], None]] = None,
     ):
         self.width = width
         self.height = height
@@ -196,6 +199,7 @@ class OverlayWindow:
         self.on_mouse_down = on_mouse_down
         self.on_mouse_move = on_mouse_move
         self.on_mouse_up = on_mouse_up
+        self.on_display_change = on_display_change
 
         self.hwnd: Optional[int] = None
         self._wndproc_ref = None  # Prevent garbage collection of callback
@@ -352,6 +356,14 @@ class OverlayWindow:
                     self.on_mouse_up(pos.x, pos.y)
             return 0
 
+        elif msg in (WM_DISPLAYCHANGE, WM_SETTINGCHANGE):
+            if self.on_display_change:
+                try:
+                    self.on_display_change()
+                except Exception as e:
+                    logger.error(f"Error in on_display_change callback: {e}")
+            return 0
+
         elif msg == WM_DESTROY:
             user32.PostQuitMessage(0)
             return 0

catser/window_manager.py

@@ -60,6 +60,25 @@ class WindowInfo:
         return max(0, self.rect[3] - self.rect[1])
 
 
+@dataclass
+class WindowLedge:
+    """Represents a walkable top surface of a desktop window."""
+    hwnd: int
+    title: str
+    left: float
+    right: float
+    top_y: float
+
+
+@dataclass
+class MonitorInfo:
+    """Represents a display monitor and its working area (excluding taskbar)."""
+    handle: int
+    is_primary: bool
+    rect: Tuple[int, int, int, int]      # (left, top, right, bottom)
+    work_area: Tuple[int, int, int, int] # (left, top, right, bottom) excluding taskbar
+
+
 class WindowManager:
     """Win32 window query and manipulation utility."""
 
@@ -174,7 +193,9 @@ class WindowManager:
         process_predicate: Optional[Callable[[str], bool]] = None,
     ) -> Optional[WindowInfo]:
         """
-        Enumerates top-level desktop windows to find the first matching window.
+        Enumerates top-level desktop windows to find the first matching visible window.
+        Uses the user's interactive input desktop to ensure windows across all monitors
+        are discovered even if the calling thread has a different default desktop.
         """
         found_hwnd = None
 
@@ -189,6 +210,10 @@ class WindowManager:
             if not title:
                 return True
 
+            # Never target Catser's own overlay window
+            if "catser overlay" in title.lower():
+                return True
+
             if title_predicate and title_predicate(title):
                 found_hwnd = hwnd
                 return False  # Stop enumeration
@@ -201,7 +226,12 @@ class WindowManager:
 
             return True
 
-        user32.EnumWindows(WNDENUMPROC(enum_proc), 0)
+        h_input_desk = user32.OpenInputDesktop(0, False, 0x01FF)
+        if h_input_desk:
+            user32.EnumDesktopWindows(h_input_desk, WNDENUMPROC(enum_proc), 0)
+            user32.CloseDesktop(h_input_desk)
+        else:
+            user32.EnumWindows(WNDENUMPROC(enum_proc), 0)
 
         if found_hwnd:
             return cls.get_window_info(found_hwnd)
@@ -283,3 +313,140 @@ class WindowManager:
             return (0, 0, w, h)
 
         return (vx, vy, vx + vw, vy + vh)
+
+    @classmethod
+    def get_monitors(cls) -> List[MonitorInfo]:
+        """
+        Enumerates all connected display monitors and returns their full
+        bounding rectangles and work areas (excluding taskbars).
+        """
+        class _MONITORINFO(ctypes.Structure):
+            _fields_ = [
+                ("cbSize", wintypes.DWORD),
+                ("rcMonitor", wintypes.RECT),
+                ("rcWork", wintypes.RECT),
+                ("dwFlags", wintypes.DWORD),
+            ]
+
+        monitors: List[MonitorInfo] = []
+        MONITORENUMPROC = ctypes.WINFUNCTYPE(ctypes.c_bool, wintypes.HMONITOR, wintypes.HDC, ctypes.POINTER(wintypes.RECT), wintypes.LPARAM)
+
+        def enum_mon_proc(h_mon, hdc, lprect, lparam):
+            mi = _MONITORINFO()
+            mi.cbSize = ctypes.sizeof(_MONITORINFO)
+            if user32.GetMonitorInfoW(h_mon, ctypes.byref(mi)):
+                m = mi.rcMonitor
+                w = mi.rcWork
+                is_pri = bool(mi.dwFlags & 1)
+                monitors.append(MonitorInfo(
+                    handle=int(h_mon),
+                    is_primary=is_pri,
+                    rect=(m.left, m.top, m.right, m.bottom),
+                    work_area=(w.left, w.top, w.right, w.bottom),
+                ))
+            return True
+
+        user32.EnumDisplayMonitors(0, None, MONITORENUMPROC(enum_mon_proc), 0)
+        return monitors
+
+    @classmethod
+    def get_display_topology_signature(cls) -> tuple:
+        """
+        Returns a hashable signature representing current displays, resolutions, and work areas.
+        Used to detect dynamic monitor connection, disconnection, or resolution adjustments.
+        """
+        monitors = cls.get_monitors()
+        vd = cls.get_virtual_desktop_bounds()
+        return (vd, tuple((m.handle, m.is_primary, m.rect, m.work_area) for m in monitors))
+
+    @classmethod
+    def get_floor_y_at(cls, x: float, cat_height: int) -> float:
+        """
+        Returns the screen floor Y coordinate for a given horizontal X position,
+        accounting for multi-monitor setups where different monitors have taskbars
+        at different vertical coordinates.
+        """
+        monitors = cls.get_monitors()
+        for mon in monitors:
+            wa = mon.work_area
+            if wa[0] <= x < wa[2]:
+                return float(wa[3] - cat_height)
+
+        # Fallback to primary work area
+        wa_pri = cls.get_work_area()
+        return float(wa_pri[3] - cat_height)
+
+    @classmethod
+    def get_window_ledges(cls, min_width: int = 120) -> List[WindowLedge]:
+        """
+        Queries all visible, non-minimized top-level windows to extract
+        walkable horizontal platforms (window top titlebar frames).
+        """
+        ledges: List[WindowLedge] = []
+        WNDENUMPROC = ctypes.WINFUNCTYPE(ctypes.c_bool, wintypes.HWND, wintypes.LPARAM)
+
+        def enum_proc(hwnd, lparam):
+            if not user32.IsWindowVisible(hwnd) or user32.IsIconic(hwnd):
+                return True
+
+            title = cls.get_window_title(hwnd)
+            if not title:
+                return True
+
+            # Exclude overlays and desktop shell
+            t_lower = title.lower()
+            if "catser overlay" in t_lower or "program manager" in t_lower:
+                return True
+
+            rect = cls.get_window_rect(hwnd)
+            if not rect:
+                return True
+
+            left, top, right, bottom = rect
+            width = right - left
+            height = bottom - top
+
+            # Window must be large enough to serve as a platform
+            if width >= min_width and height >= 60:
+                ledges.append(WindowLedge(
+                    hwnd=hwnd,
+                    title=title,
+                    left=float(left),
+                    right=float(right),
+                    top_y=float(top),
+                ))
+            return True
+
+        h_input_desk = user32.OpenInputDesktop(0, False, 0x01FF)
+        if h_input_desk:
+            user32.EnumDesktopWindows(h_input_desk, WNDENUMPROC(enum_proc), 0)
+            user32.CloseDesktop(h_input_desk)
+        else:
+            user32.EnumWindows(WNDENUMPROC(enum_proc), 0)
+
+        # Sort highest ledge first (lowest top_y)
+        ledges.sort(key=lambda l: l.top_y)
+        return ledges
+
+    @classmethod
+    def get_surface_beneath(cls, x: float, y: float, cat_width: int, cat_height: int) -> float:
+        """
+        Finds the highest walking surface directly beneath the cat (either an open
+        window top ledge or the monitor floor). Returns the target cat.y coordinate
+        (i.e. surface_top_y - cat_height).
+        """
+        cat_center_x = x + cat_width * 0.5
+        feet_y = y + cat_height
+        floor_y = cls.get_floor_y_at(cat_center_x, cat_height)
+
+        # Search for window ledges below the cat's current feet
+        candidate_y = floor_y
+        ledges = cls.get_window_ledges(min_width=100)
+        for ledge in ledges:
+            if ledge.left <= cat_center_x <= ledge.right:
+                target_cat_y = ledge.top_y - cat_height
+                # Is this ledge below the cat's feet (with 6px landing tolerance)?
+                if ledge.top_y >= feet_y - 6.0 and target_cat_y < candidate_y:
+                    candidate_y = target_cat_y
+
+        return candidate_y