diff --git a/backlog/tasks/task-336 - Fix-Hyprland-fullscreen-overlay-downward-offset.md b/backlog/tasks/task-336 - Fix-Hyprland-fullscreen-overlay-downward-offset.md
new file mode 100644
index 00000000..90ddf7fa
--- /dev/null
+++ b/backlog/tasks/task-336 - Fix-Hyprland-fullscreen-overlay-downward-offset.md	
@@ -0,0 +1,55 @@
+---
+id: TASK-336
+title: Fix Hyprland fullscreen overlay downward offset
+status: Done
+assignee: []
+created_date: '2026-05-04 05:42'
+updated_date: '2026-05-04 05:56'
+labels:
+  - linux
+  - hyprland
+  - overlay
+  - bug
+dependencies: []
+references:
+  - src/window-trackers/hyprland-tracker.ts
+  - src/core/services/overlay-window-bounds.ts
+  - src/main/runtime/linux-mpv-fullscreen-overlay-refresh.ts
+priority: medium
+---
+
+## Description
+
+<!-- SECTION:DESCRIPTION:BEGIN -->
+SubMiner visible overlay is slightly below mpv when mpv is fullscreen on Linux Hyprland. Align overlay bounds with mpv fullscreen client/monitor bounds.
+<!-- SECTION:DESCRIPTION:END -->
+
+## Acceptance Criteria
+<!-- AC:BEGIN -->
+- [x] #1 Hyprland fullscreen mpv overlay uses top-aligned geometry instead of inheriting a downward offset.
+- [x] #2 Regression coverage captures the fullscreen Hyprland geometry case.
+- [x] #3 Targeted tests pass.
+<!-- AC:END -->
+
+## Implementation Notes
+
+<!-- SECTION:NOTES:BEGIN -->
+Added follow-up Hyprland placement handling after the fullscreenClient geometry fix. SubMiner overlay/stats windows now get stable titles and, on Hyprland, are resolved from `hyprctl -j clients` by current PID/title, then set floating and pinned before bounds are applied. The stats overlay reapplies bounds after showing because Hyprland cannot see the hidden window before it is mapped.
+<!-- SECTION:NOTES:END -->
+
+## Final Summary
+
+<!-- SECTION:FINAL_SUMMARY:BEGIN -->
+Summary:
+- Treated Hyprland `fullscreenClient` as a fullscreen signal when resolving mpv overlay geometry.
+- Added Hyprland window placement handling so SubMiner overlay/stats windows are set floating and pinned before bounds are applied.
+- Gave overlay/stats windows stable titles for Hyprland client matching, and reapplied stats bounds after show.
+- Added regression coverage for the 28px fullscreen geometry shape and Hyprland placement dispatches.
+- Added a changelog fragment for the overlay fix.
+
+Verification:
+- `bun test src/core/services/hyprland-window-placement.test.ts src/core/services/overlay-window-config.test.ts src/core/services/stats-window.test.ts src/core/services/overlay-window-bounds.test.ts src/window-trackers/hyprland-tracker.test.ts`
+- `bun run typecheck`
+- `bun run changelog:lint`
+- `bun run test:fast`
+<!-- SECTION:FINAL_SUMMARY:END -->
diff --git a/changes/336-hyprland-fullscreen-overlay.md b/changes/336-hyprland-fullscreen-overlay.md
new file mode 100644
index 00000000..668ff5b9
--- /dev/null
+++ b/changes/336-hyprland-fullscreen-overlay.md
@@ -0,0 +1,4 @@
+type: fixed
+area: overlay
+
+- Overlay: Aligned the Hyprland fullscreen overlay with mpv when mpv reports client-requested fullscreen.
diff --git a/src/core/services/hyprland-window-placement.test.ts b/src/core/services/hyprland-window-placement.test.ts
new file mode 100644
index 00000000..8df261d6
--- /dev/null
+++ b/src/core/services/hyprland-window-placement.test.ts
@@ -0,0 +1,117 @@
+import assert from 'node:assert/strict';
+import test from 'node:test';
+import {
+  buildHyprlandPlacementDispatches,
+  ensureHyprlandWindowFloatingByTitle,
+  findHyprlandWindowForPlacement,
+  shouldAttemptHyprlandWindowPlacement,
+} from './hyprland-window-placement';
+
+test('shouldAttemptHyprlandWindowPlacement only enables on Hyprland Linux sessions', () => {
+  assert.equal(
+    shouldAttemptHyprlandWindowPlacement('linux', {
+      HYPRLAND_INSTANCE_SIGNATURE: 'abc',
+    }),
+    true,
+  );
+  assert.equal(
+    shouldAttemptHyprlandWindowPlacement('linux', {
+      WAYLAND_DISPLAY: 'wayland-1',
+    }),
+    false,
+  );
+  assert.equal(
+    shouldAttemptHyprlandWindowPlacement('darwin', {
+      HYPRLAND_INSTANCE_SIGNATURE: 'abc',
+    }),
+    false,
+  );
+});
+
+test('findHyprlandWindowForPlacement matches current process by title', () => {
+  const client = findHyprlandWindowForPlacement(
+    [
+      {
+        address: '0xother',
+        pid: 123,
+        title: 'SubMiner Stats',
+        mapped: true,
+      },
+      {
+        address: '0xmatch',
+        pid: 456,
+        title: 'SubMiner Stats',
+        mapped: true,
+      },
+    ],
+    {
+      pid: 456,
+      title: 'SubMiner Stats',
+    },
+  );
+
+  assert.equal(client?.address, '0xmatch');
+});
+
+test('buildHyprlandPlacementDispatches floats and pins tiled overlay windows', () => {
+  assert.deepEqual(
+    buildHyprlandPlacementDispatches({
+      address: '0xabc',
+      floating: false,
+      pinned: false,
+    }),
+    [
+      ['dispatch', 'setfloating', 'address:0xabc'],
+      ['dispatch', 'pin', 'address:0xabc'],
+    ],
+  );
+});
+
+test('buildHyprlandPlacementDispatches skips already floating and pinned windows', () => {
+  assert.deepEqual(
+    buildHyprlandPlacementDispatches({
+      address: '0xabc',
+      floating: true,
+      pinned: true,
+    }),
+    [],
+  );
+});
+
+test('ensureHyprlandWindowFloatingByTitle dispatches placement for matching tiled window', () => {
+  const calls: unknown[][] = [];
+  const placed = ensureHyprlandWindowFloatingByTitle({
+    title: 'SubMiner Stats',
+    platform: 'linux',
+    env: {
+      HYPRLAND_INSTANCE_SIGNATURE: 'abc',
+    },
+    pid: 456,
+    execFileSync: ((command: string, args: string[], options: unknown) => {
+      calls.push([command, args, options]);
+      if (args.join(' ') === '-j clients') {
+        return JSON.stringify([
+          {
+            address: '0xmatch',
+            pid: 456,
+            title: 'SubMiner Stats',
+            mapped: true,
+            floating: false,
+            pinned: false,
+          },
+        ]);
+      }
+      return '';
+    }) as never,
+  });
+
+  assert.equal(placed, true);
+  assert.deepEqual(
+    calls.map(([, args]) => args),
+    [
+      ['-j', 'clients'],
+      ['dispatch', 'setfloating', 'address:0xmatch'],
+      ['dispatch', 'pin', 'address:0xmatch'],
+    ],
+  );
+});
diff --git a/src/core/services/hyprland-window-placement.ts b/src/core/services/hyprland-window-placement.ts
new file mode 100644
index 00000000..d4a2c1fa
--- /dev/null
+++ b/src/core/services/hyprland-window-placement.ts
@@ -0,0 +1,107 @@
+import { execFileSync } from 'node:child_process';
+
+export interface HyprlandPlacementClient {
+  address?: string;
+  floating?: boolean;
+  hidden?: boolean;
+  initialTitle?: string;
+  mapped?: boolean;
+  pid?: number;
+  pinned?: boolean;
+  title?: string;
+}
+
+type ExecFileSync = typeof execFileSync;
+
+export function shouldAttemptHyprlandWindowPlacement(
+  platform: NodeJS.Platform = process.platform,
+  env: NodeJS.ProcessEnv = process.env,
+): boolean {
+  return platform === 'linux' && Boolean(env.HYPRLAND_INSTANCE_SIGNATURE);
+}
+
+function parseHyprlandClients(output: string): HyprlandPlacementClient[] {
+  const payloadStart = output.indexOf('[');
+  if (payloadStart < 0) {
+    return [];
+  }
+
+  const parsed = JSON.parse(output.slice(payloadStart)) as unknown;
+  return Array.isArray(parsed) ? (parsed as HyprlandPlacementClient[]) : [];
+}
+
+export function findHyprlandWindowForPlacement(
+  clients: HyprlandPlacementClient[],
+  options: {
+    pid: number;
+    title: string;
+  },
+): HyprlandPlacementClient | null {
+  const title = options.title.trim();
+  if (!title) {
+    return null;
+  }
+
+  return (
+    clients.find(
+      (client) =>
+        client.pid === options.pid &&
+        client.address &&
+        client.mapped !== false &&
+        client.hidden !== true &&
+        (client.title === title || client.initialTitle === title),
+    ) ?? null
+  );
+}
+
+export function buildHyprlandPlacementDispatches(
+  client: HyprlandPlacementClient,
+): string[][] {
+  if (!client.address) {
+    return [];
+  }
+
+  const windowAddress = `address:${client.address}`;
+  const dispatches: string[][] = [];
+  if (client.floating !== true) {
+    dispatches.push(['dispatch', 'setfloating', windowAddress]);
+  }
+  if (client.pinned !== true) {
+    dispatches.push(['dispatch', 'pin', windowAddress]);
+  }
+  return dispatches;
+}
+
+export function ensureHyprlandWindowFloatingByTitle(options: {
+  title: string;
+  platform?: NodeJS.Platform;
+  env?: NodeJS.ProcessEnv;
+  pid?: number;
+  execFileSync?: ExecFileSync;
+}): boolean {
+  if (!shouldAttemptHyprlandWindowPlacement(options.platform, options.env)) {
+    return false;
+  }
+
+  const run = options.execFileSync ?? execFileSync;
+  try {
+    const clients = parseHyprlandClients(
+      String(run('hyprctl', ['-j', 'clients'], { encoding: 'utf-8' })),
+    );
+    const client = findHyprlandWindowForPlacement(clients, {
+      pid: options.pid ?? process.pid,
+      title: options.title,
+    });
+    if (!client) {
+      return false;
+    }
+
+    const dispatches = buildHyprlandPlacementDispatches(client);
+    for (const args of dispatches) {
+      run('hyprctl', args, { stdio: 'ignore' });
+    }
+    return dispatches.length > 0;
+  } catch {
+    return false;
+  }
+}
diff --git a/src/core/services/overlay-manager.test.ts b/src/core/services/overlay-manager.test.ts
index 6f1ca42e..d557b633 100644
--- a/src/core/services/overlay-manager.test.ts
+++ b/src/core/services/overlay-manager.test.ts
@@ -77,6 +77,7 @@ test('overlay manager applies bounds for main and modal windows', () => {
   const visibleCalls: Electron.Rectangle[] = [];
   const visibleWindow = {
     isDestroyed: () => false,
+    getTitle: () => 'SubMiner Overlay',
     setBounds: (bounds: Electron.Rectangle) => {
       visibleCalls.push(bounds);
     },
@@ -84,6 +85,7 @@ test('overlay manager applies bounds for main and modal windows', () => {
   const modalCalls: Electron.Rectangle[] = [];
   const modalWindow = {
     isDestroyed: () => false,
+    getTitle: () => 'SubMiner Overlay Modal',
     setBounds: (bounds: Electron.Rectangle) => {
       modalCalls.push(bounds);
     },
diff --git a/src/core/services/overlay-window-config.test.ts b/src/core/services/overlay-window-config.test.ts
index fda73465..33234bf9 100644
--- a/src/core/services/overlay-window-config.test.ts
+++ b/src/core/services/overlay-window-config.test.ts
@@ -8,6 +8,7 @@ test('overlay window config explicitly disables renderer sandbox for preload com
     yomitanSession: null,
   });
 
+  assert.equal(options.title, 'SubMiner Overlay');
   assert.equal(options.backgroundColor, '#00000000');
   assert.equal(options.webPreferences?.sandbox, false);
   assert.equal(options.webPreferences?.backgroundThrottling, false);
diff --git a/src/core/services/overlay-window-options.ts b/src/core/services/overlay-window-options.ts
index 146373a3..bd69a529 100644
--- a/src/core/services/overlay-window-options.ts
+++ b/src/core/services/overlay-window-options.ts
@@ -2,6 +2,11 @@ import type { BrowserWindowConstructorOptions, Session } from 'electron';
 import * as path from 'path';
 import type { OverlayWindowKind } from './overlay-window-input';
 
+export const OVERLAY_WINDOW_TITLES: Record<OverlayWindowKind, string> = {
+  visible: 'SubMiner Overlay',
+  modal: 'SubMiner Overlay Modal',
+};
+
 export function buildOverlayWindowOptions(
   kind: OverlayWindowKind,
   options: {
@@ -14,6 +19,7 @@ export function buildOverlayWindowOptions(
 
   return {
     show: false,
+    title: OVERLAY_WINDOW_TITLES[kind],
     width: 800,
     height: 600,
     x: 0,
diff --git a/src/core/services/overlay-window.ts b/src/core/services/overlay-window.ts
index 05820a5e..0e2ac4fd 100644
--- a/src/core/services/overlay-window.ts
+++ b/src/core/services/overlay-window.ts
@@ -1,4 +1,5 @@
-import { BrowserWindow, screen, type Session } from 'electron';
+import electron from 'electron';
+import type { BrowserWindow, Session } from 'electron';
 import * as path from 'path';
 import { WindowGeometry } from '../../types';
 import { createLogger } from '../../logger';
@@ -8,12 +9,14 @@ import {
   handleOverlayWindowBlurred,
   type OverlayWindowKind,
 } from './overlay-window-input';
+import { ensureHyprlandWindowFloatingByTitle } from './hyprland-window-placement';
 import { buildOverlayWindowOptions } from './overlay-window-options';
 import { normalizeOverlayWindowBoundsForPlatform } from './overlay-window-bounds';
 import { OVERLAY_WINDOW_CONTENT_READY_FLAG } from './overlay-window-flags';
 export { OVERLAY_WINDOW_CONTENT_READY_FLAG } from './overlay-window-flags';
 
 const logger = createLogger('main:overlay-window');
+const { BrowserWindow: ElectronBrowserWindow, screen } = electron;
 const overlayWindowLayerByInstance = new WeakMap<BrowserWindow, OverlayWindowKind>();
 const overlayWindowContentReady = new WeakSet<BrowserWindow>();
 
@@ -50,6 +53,7 @@ export function updateOverlayWindowBounds(
   window: BrowserWindow | null,
 ): void {
   if (!geometry || !window || window.isDestroyed()) return;
+  ensureHyprlandWindowFloatingByTitle({ title: window.getTitle() });
   window.setBounds(normalizeOverlayWindowBoundsForPlatform(geometry, process.platform, screen));
 }
 
@@ -68,6 +72,7 @@ export function ensureOverlayWindowLevel(window: BrowserWindow): void {
   }
   window.setAlwaysOnTop(true);
   window.setVisibleOnAllWorkspaces(true, { visibleOnFullScreen: true });
+  ensureHyprlandWindowFloatingByTitle({ title: window.getTitle() });
   window.moveTop();
 }
 
@@ -99,7 +104,7 @@ export function createOverlayWindow(
     yomitanSession?: Session | null;
   },
 ): BrowserWindow {
-  const window = new BrowserWindow(buildOverlayWindowOptions(kind, options));
+  const window = new ElectronBrowserWindow(buildOverlayWindowOptions(kind, options));
   (window as BrowserWindow & { [OVERLAY_WINDOW_CONTENT_READY_FLAG]?: boolean })[
     OVERLAY_WINDOW_CONTENT_READY_FLAG
   ] = false;
diff --git a/src/core/services/stats-window-runtime.ts b/src/core/services/stats-window-runtime.ts
index 55bbdec9..aca4a492 100644
--- a/src/core/services/stats-window-runtime.ts
+++ b/src/core/services/stats-window-runtime.ts
@@ -3,6 +3,7 @@ import type { WindowGeometry } from '../../types';
 
 const DEFAULT_STATS_WINDOW_WIDTH = 900;
 const DEFAULT_STATS_WINDOW_HEIGHT = 700;
+export const STATS_WINDOW_TITLE = 'SubMiner Stats';
 
 type StatsWindowLevelController = Pick<BrowserWindow, 'setAlwaysOnTop' | 'moveTop'> &
   Partial<Pick<BrowserWindow, 'setVisibleOnAllWorkspaces' | 'setFullScreenable'>>;
@@ -30,6 +31,7 @@ export function buildStatsWindowOptions(options: {
   bounds?: WindowGeometry | null;
 }): BrowserWindowConstructorOptions {
   return {
+    title: STATS_WINDOW_TITLE,
     x: options.bounds?.x,
     y: options.bounds?.y,
     width: options.bounds?.width ?? DEFAULT_STATS_WINDOW_WIDTH,
diff --git a/src/core/services/stats-window.test.ts b/src/core/services/stats-window.test.ts
index 8bc631c5..87b95160 100644
--- a/src/core/services/stats-window.test.ts
+++ b/src/core/services/stats-window.test.ts
@@ -18,6 +18,7 @@ test('buildStatsWindowOptions uses tracked overlay bounds and preload-friendly w
     },
   });
 
+  assert.equal(options.title, 'SubMiner Stats');
   assert.equal(options.x, 120);
   assert.equal(options.y, 80);
   assert.equal(options.width, 1440);
diff --git a/src/core/services/stats-window.ts b/src/core/services/stats-window.ts
index f35b11b9..fcf36724 100644
--- a/src/core/services/stats-window.ts
+++ b/src/core/services/stats-window.ts
@@ -7,7 +7,9 @@ import {
   buildStatsWindowOptions,
   promoteStatsWindowLevel,
   shouldHideStatsWindowForInput,
+  STATS_WINDOW_TITLE,
 } from './stats-window-runtime.js';
+import { ensureHyprlandWindowFloatingByTitle } from './hyprland-window-placement.js';
 
 let statsWindow: BrowserWindow | null = null;
 let toggleRegistered = false;
@@ -41,6 +43,9 @@ function showStatsWindow(window: BrowserWindow, options: StatsWindowOptions): vo
   syncStatsWindowBounds(window, options.resolveBounds());
   promoteStatsWindowLevel(window);
   window.show();
+  if (ensureHyprlandWindowFloatingByTitle({ title: STATS_WINDOW_TITLE })) {
+    syncStatsWindowBounds(window, options.resolveBounds());
+  }
   window.focus();
   options.onVisibilityChanged?.(true);
   promoteStatsWindowLevel(window);
diff --git a/src/window-trackers/hyprland-tracker.test.ts b/src/window-trackers/hyprland-tracker.test.ts
index 1f8c6a60..2c645b00 100644
--- a/src/window-trackers/hyprland-tracker.test.ts
+++ b/src/window-trackers/hyprland-tracker.test.ts
@@ -149,3 +149,23 @@ test('resolveHyprlandWindowGeometry uses monitor bounds for fullscreen clients',
     height: 1440,
   });
 });
+
+test('resolveHyprlandWindowGeometry uses monitor bounds for client-requested fullscreen', () => {
+  const geometry = resolveHyprlandWindowGeometry(
+    makeClient({
+      at: [0, 28],
+      size: [1920, 1052],
+      monitor: 0,
+      fullscreen: 0,
+      fullscreenClient: 2,
+    }),
+    [makeMonitor({ id: 0, x: 0, y: 0, width: 1920, height: 1080 })],
+  );
+
+  assert.deepEqual(geometry, {
+    x: 0,
+    y: 0,
+    width: 1920,
+    height: 1080,
+  });
+});
diff --git a/src/window-trackers/hyprland-tracker.ts b/src/window-trackers/hyprland-tracker.ts
index 86207fc8..290a787d 100644
--- a/src/window-trackers/hyprland-tracker.ts
+++ b/src/window-trackers/hyprland-tracker.ts
@@ -159,7 +159,7 @@ export function parseHyprctlMonitors(output: string): HyprlandMonitor[] | null {
 }
 
 function isHyprlandFullscreenClient(client: HyprlandClient): boolean {
-  return (client.fullscreen ?? 0) > 0;
+  return (client.fullscreen ?? 0) > 0 || (client.fullscreenClient ?? 0) > 0;
 }
 
 export function resolveHyprlandWindowGeometry(