diff --git a/renderer.js b/renderer.js
index 17dda34..cad2d60 100644
--- a/renderer.js
+++ b/renderer.js
@@ -867,6 +867,10 @@ if (window.visualizerSettings) {
   // Focus Mode: smoothly fade canvas opacity based on user activity
   if (typeof window.visualizerSettings.onFocusModeOpacity === "function") {
     window.visualizerSettings.onFocusModeOpacity(({ opacity }) => {
+      const duration = (visualizerState.focusMode && typeof visualizerState.focusMode.transitionDuration === "number")
+        ? visualizerState.focusMode.transitionDuration
+        : 1.5;
+      canvas.style.transition = `opacity ${duration}s ease`;
       canvas.style.opacity = typeof opacity === "number" ? String(opacity) : "1";
     });
   }
diff --git a/settings.html b/settings.html
index 13e3ddc..392430d 100644
--- a/settings.html
+++ b/settings.html
@@ -654,33 +654,42 @@ <h3>Theme Automation</h3>
 
                 <div class="settings-group">
                     <h3>Focus Mode</h3>
-                    <p class="setting-desc">Dim the visualizer when you are actively using your computer to reduce distractions, and restore full opacity when idle.</p>
+                    <p class="setting-desc">Dims the visualizer during user activity to keep the desktop clean, and restores full brightness when idle.</p>
+                    
                     <div class="switch-control" style="margin-top: 16px; display: flex; justify-content: space-between; align-items: center;">
                         <div>
                             <span style="font-weight: 500; font-size: 15px; color: #e2e8f0;">Enable Focus Mode</span>
-                            <p class="setting-desc" style="margin-top: 4px; margin-bottom: 0;">Dim the visualizer during active user input.</p>
+                            <p class="setting-desc" style="margin-top: 4px; margin-bottom: 0;">Automatically dim visualizer when you are active.</p>
                         </div>
                         <label class="switch">
-                            <input type="checkbox" id="focus-mode-enabled-checkbox">
+                            <input type="checkbox" id="focus-mode-checkbox">
                             <span class="slider-round"></span>
                         </label>
                     </div>
 
-                    <div id="focusModeControls" style="display: none; margin-top: 20px;">
-                        <div class="slider-control" style="margin-bottom: 20px;">
+                    <div id="focus-mode-settings-container" style="display: none; margin-top: 16px;">
+                        <div class="slider-control">
                             <div class="slider-header">
-                                <label for="focus-mode-dim-opacity-slider">Dimmed Opacity</label>
-                                <span class="slider-value" id="val-focus-mode-dim-opacity">0.10</span>
+                                <label for="focus-mode-dim-opacity">Dimmed Opacity</label>
+                                <span class="slider-value" id="val-focus-mode-dim-opacity">10%</span>
                             </div>
-                            <input type="range" id="focus-mode-dim-opacity-slider" min="0.0" max="1.0" step="0.05" value="0.10">
+                            <input type="range" id="focus-mode-dim-opacity" min="0" max="100" value="10">
                         </div>
 
-                        <div class="slider-control">
+                        <div class="slider-control" style="margin-top: 16px;">
+                            <div class="slider-header">
+                                <label for="focus-mode-idle-timeout">Idle Timeout (seconds)</label>
+                                <span class="slider-value" id="val-focus-mode-idle-timeout">5s</span>
+                            </div>
+                            <input type="range" id="focus-mode-idle-timeout" min="1" max="60" value="5">
+                        </div>
+
+                        <div class="slider-control" style="margin-top: 16px;">
                             <div class="slider-header">
-                                <label for="focus-mode-timeout-slider">Activity Idle Timeout (seconds)</label>
-                                <span class="slider-value" id="val-focus-mode-timeout">5</span>
+                                <label for="focus-mode-transition-duration">Fade Duration (seconds)</label>
+                                <span class="slider-value" id="val-focus-mode-transition-duration">1.5s</span>
                             </div>
-                            <input type="range" id="focus-mode-timeout-slider" min="1" max="60" step="1" value="5">
+                            <input type="range" id="focus-mode-transition-duration" min="0.1" max="10" step="0.1" value="1.5">
                         </div>
                     </div>
                 </div>
diff --git a/settings.js b/settings.js
index fada367..7ba486b 100644
--- a/settings.js
+++ b/settings.js
@@ -316,16 +316,15 @@ document.addEventListener('DOMContentLoaded', () => {
     // ----------------------------------------
     // FOCUS MODE BINDINGS
     // ----------------------------------------
-    const focusModeEnabledCheckbox = document.getElementById('focus-mode-enabled-checkbox');
-    const focusModeControls = document.getElementById('focusModeControls');
-    const focusModeDimOpacitySlider = document.getElementById('focus-mode-dim-opacity-slider');
-    const focusModeTimeoutSlider = document.getElementById('focus-mode-timeout-slider');
-    const focusModeDimOpacityLabel = document.getElementById('val-focus-mode-dim-opacity');
-    const focusModeTimeoutLabel = document.getElementById('val-focus-mode-timeout');
+    const focusModeCheckbox = document.getElementById('focus-mode-checkbox');
+    const focusModeSettingsContainer = document.getElementById('focus-mode-settings-container');
+    const focusModeDimOpacity = document.getElementById('focus-mode-dim-opacity');
+    const focusModeIdleTimeout = document.getElementById('focus-mode-idle-timeout');
+    const focusModeTransitionDuration = document.getElementById('focus-mode-transition-duration');
 
     function toggleFocusModeControls(isEnabled) {
-        if (focusModeControls) {
-            focusModeControls.style.display = isEnabled ? 'block' : 'none';
+        if (focusModeSettingsContainer) {
+            focusModeSettingsContainer.style.display = isEnabled ? 'block' : 'none';
         }
     }
 
@@ -333,41 +332,48 @@ document.addEventListener('DOMContentLoaded', () => {
         if (window.visualizerSettings) {
             const currentFocusMode = cachedSettings.focusMode || {};
             const nextFocusMode = { ...currentFocusMode, ...patch };
-            cachedSettings.focusMode = nextFocusMode; // Optimistic local cache update!
+            cachedSettings.focusMode = nextFocusMode; // Optimistic local cache update
             window.visualizerSettings.update({
                 focusMode: nextFocusMode
             });
         }
     }
 
-    if (focusModeEnabledCheckbox) {
-        focusModeEnabledCheckbox.addEventListener('change', (e) => {
+    if (focusModeCheckbox) {
+        focusModeCheckbox.addEventListener('change', (e) => {
             const isChecked = e.target.checked;
             toggleFocusModeControls(isChecked);
             updateFocusModeSetting({ enabled: isChecked });
         });
     }
 
-    if (focusModeDimOpacitySlider) {
-        focusModeDimOpacitySlider.addEventListener('input', (e) => {
-            const val = parseFloat(e.target.value);
-            if (focusModeDimOpacityLabel) {
-                focusModeDimOpacityLabel.textContent = val.toFixed(2);
-            }
+    if (focusModeDimOpacity) {
+        focusModeDimOpacity.addEventListener('input', (e) => {
+            const val = parseFloat(e.target.value) / 100;
+            const valEl = document.getElementById('val-focus-mode-dim-opacity');
+            if (valEl) valEl.textContent = `${e.target.value}%`;
             updateFocusModeSetting({ dimOpacity: val });
         });
     }
 
-    if (focusModeTimeoutSlider) {
-        focusModeTimeoutSlider.addEventListener('input', (e) => {
-            const val = parseInt(e.target.value, 10);
-            if (focusModeTimeoutLabel) {
-                focusModeTimeoutLabel.textContent = val;
-            }
+    if (focusModeIdleTimeout) {
+        focusModeIdleTimeout.addEventListener('input', (e) => {
+            const val = parseInt(e.target.value, 10) || 5;
+            const valEl = document.getElementById('val-focus-mode-idle-timeout');
+            if (valEl) valEl.textContent = `${val}s`;
             updateFocusModeSetting({ idleTimeout: val });
         });
     }
 
+    if (focusModeTransitionDuration) {
+        focusModeTransitionDuration.addEventListener('input', (e) => {
+            const val = parseFloat(e.target.value) || 1.5;
+            const valEl = document.getElementById('val-focus-mode-transition-duration');
+            if (valEl) valEl.textContent = `${val.toFixed(1)}s`;
+            updateFocusModeSetting({ transitionDuration: val });
+        });
+    }
+
     const themeSelector = document.getElementById('theme-selector');
     if (themeSelector) {
         themeSelector.addEventListener('change', (e) => {
@@ -383,6 +389,7 @@ document.addEventListener('DOMContentLoaded', () => {
         });
     }
 
+
     const performanceModeSelector = document.getElementById('performance-mode-selector');
     if (performanceModeSelector) {
         performanceModeSelector.addEventListener('change', (e) => {
@@ -1356,21 +1363,27 @@ refreshThemeProfiles();
             // Load focus mode settings
             if (settings.focusMode) {
                 const fm = settings.focusMode;
-                if (focusModeEnabledCheckbox) {
-                    focusModeEnabledCheckbox.checked = !!fm.enabled;
+                if (focusModeCheckbox) {
+                    focusModeCheckbox.checked = !!fm.enabled;
                     toggleFocusModeControls(fm.enabled);
                 }
-                if (focusModeDimOpacitySlider) {
-                    focusModeDimOpacitySlider.value = fm.dimOpacity !== undefined ? fm.dimOpacity : 0.1;
-                    if (focusModeDimOpacityLabel) {
-                        focusModeDimOpacityLabel.textContent = parseFloat(focusModeDimOpacitySlider.value).toFixed(2);
-                    }
+                if (focusModeDimOpacity) {
+                    const pct = Math.round((fm.dimOpacity !== undefined ? fm.dimOpacity : 0.1) * 100);
+                    focusModeDimOpacity.value = pct;
+                    const valEl = document.getElementById('val-focus-mode-dim-opacity');
+                    if (valEl) valEl.textContent = `${pct}%`;
                 }
-                if (focusModeTimeoutSlider) {
-                    focusModeTimeoutSlider.value = fm.idleTimeout !== undefined ? fm.idleTimeout : 5;
-                    if (focusModeTimeoutLabel) {
-                        focusModeTimeoutLabel.textContent = focusModeTimeoutSlider.value;
-                    }
+                if (focusModeIdleTimeout) {
+                    const secs = fm.idleTimeout !== undefined ? fm.idleTimeout : 5;
+                    focusModeIdleTimeout.value = secs;
+                    const valEl = document.getElementById('val-focus-mode-idle-timeout');
+                    if (valEl) valEl.textContent = `${secs}s`;
+                }
+                if (focusModeTransitionDuration) {
+                    const duration = fm.transitionDuration !== undefined ? fm.transitionDuration : 1.5;
+                    focusModeTransitionDuration.value = duration;
+                    const valEl = document.getElementById('val-focus-mode-transition-duration');
+                    if (valEl) valEl.textContent = `${duration.toFixed(1)}s`;
                 }
             }
             
@@ -1464,24 +1477,28 @@ refreshThemeProfiles();
                 updateThemeLabels(dayStart, nightStart);
             }
 
-            // Sync Focus Mode settings
+            // Sync focus mode properties if updated from outside
             if (nextSettings.focusMode) {
                 const fm = nextSettings.focusMode;
-                if (focusModeEnabledCheckbox && fm.enabled !== undefined) {
-                    focusModeEnabledCheckbox.checked = !!fm.enabled;
+                if (focusModeCheckbox && fm.enabled !== undefined) {
+                    focusModeCheckbox.checked = !!fm.enabled;
                     toggleFocusModeControls(fm.enabled);
                 }
-                if (focusModeDimOpacitySlider && fm.dimOpacity !== undefined) {
-                    focusModeDimOpacitySlider.value = fm.dimOpacity;
-                    if (focusModeDimOpacityLabel) {
-                        focusModeDimOpacityLabel.textContent = parseFloat(fm.dimOpacity).toFixed(2);
-                    }
+                if (focusModeDimOpacity && fm.dimOpacity !== undefined) {
+                    const pct = Math.round(fm.dimOpacity * 100);
+                    focusModeDimOpacity.value = pct;
+                    const valEl = document.getElementById('val-focus-mode-dim-opacity');
+                    if (valEl) valEl.textContent = `${pct}%`;
                 }
-                if (focusModeTimeoutSlider && fm.idleTimeout !== undefined) {
-                    focusModeTimeoutSlider.value = fm.idleTimeout;
-                    if (focusModeTimeoutLabel) {
-                        focusModeTimeoutLabel.textContent = fm.idleTimeout;
-                    }
+                if (focusModeIdleTimeout && fm.idleTimeout !== undefined) {
+                    focusModeIdleTimeout.value = fm.idleTimeout;
+                    const valEl = document.getElementById('val-focus-mode-idle-timeout');
+                    if (valEl) valEl.textContent = `${fm.idleTimeout}s`;
+                }
+                if (focusModeTransitionDuration && fm.transitionDuration !== undefined) {
+                    focusModeTransitionDuration.value = fm.transitionDuration;
+                    const valEl = document.getElementById('val-focus-mode-transition-duration');
+                    if (valEl) valEl.textContent = `${fm.transitionDuration.toFixed(1)}s`;
                 }
             }
 
diff --git a/settingsStore.js b/settingsStore.js
index 4426231..a4a9df5 100644
--- a/settingsStore.js
+++ b/settingsStore.js
@@ -115,7 +115,8 @@ const DEFAULT_SETTINGS = Object.freeze({
   focusMode: Object.freeze({
     enabled: false,
     dimOpacity: 0.1,
-    idleTimeout: 5
+    idleTimeout: 5,
+    transitionDuration: 1.5
   }),
   auroraDrift: Object.freeze({
     // Standard settings
@@ -572,13 +573,16 @@ function migrateLegacySettings(input = {}) {
 
 function sanitizeFocusMode(input = {}) {
   const enabled = typeof input.enabled === "boolean" ? input.enabled : DEFAULT_SETTINGS.focusMode.enabled;
-  const dimOpacity = typeof input.dimOpacity === "number" && input.dimOpacity >= 0 && input.dimOpacity <= 1
-    ? input.dimOpacity
+  const dimOpacity = typeof input.dimOpacity === "number" && Number.isFinite(input.dimOpacity)
+    ? Math.max(0, Math.min(1, input.dimOpacity))
     : DEFAULT_SETTINGS.focusMode.dimOpacity;
-  const idleTimeout = typeof input.idleTimeout === "number" && input.idleTimeout >= 1 && input.idleTimeout <= 60
-    ? input.idleTimeout
+  const idleTimeout = typeof input.idleTimeout === "number" && Number.isFinite(input.idleTimeout)
+    ? Math.max(1, Math.min(60, input.idleTimeout))
     : DEFAULT_SETTINGS.focusMode.idleTimeout;
-  return { enabled, dimOpacity, idleTimeout };
+  const transitionDuration = typeof input.transitionDuration === "number" && Number.isFinite(input.transitionDuration)
+    ? Math.max(0.1, Math.min(10, input.transitionDuration))
+    : DEFAULT_SETTINGS.focusMode.transitionDuration;
+  return { enabled, dimOpacity, idleTimeout, transitionDuration };
 }
 
 function sanitizeShortcuts(input) {
diff --git a/test/settingsStore.test.js b/test/settingsStore.test.js
index 9991bdf..40b380b 100644
--- a/test/settingsStore.test.js
+++ b/test/settingsStore.test.js
@@ -119,3 +119,36 @@ test("settingsStore - Legacy Theme conversion (sensitivity mapping)", () => {
   assert.strictEqual(sanitized.selectedTheme, "reactiveBorder");
   assert.strictEqual(sanitized.reactiveBorder.intensity, "high");
 });
+
+test("settingsStore - Focus Mode sanitization and clamping", () => {
+  const input = {
+    selectedTheme: "ambientWave",
+    focusMode: {
+      enabled: true,
+      dimOpacity: 1.5,          // should clamp to 1
+      idleTimeout: 75,         // should clamp to 60
+      transitionDuration: 15    // should clamp to 10
+    }
+  };
+  const sanitized = sanitizeSettings(input);
+  assert.strictEqual(sanitized.focusMode.enabled, true);
+  assert.strictEqual(sanitized.focusMode.dimOpacity, 1);
+  assert.strictEqual(sanitized.focusMode.idleTimeout, 60);
+  assert.strictEqual(sanitized.focusMode.transitionDuration, 10);
+
+  const inputMin = {
+    selectedTheme: "ambientWave",
+    focusMode: {
+      enabled: false,
+      dimOpacity: -0.5,        // should clamp to 0
+      idleTimeout: 0,          // should clamp to 1
+      transitionDuration: 0.05 // should clamp to 0.1
+    }
+  };
+  const sanitizedMin = sanitizeSettings(inputMin);
+  assert.strictEqual(sanitizedMin.focusMode.enabled, false);
+  assert.strictEqual(sanitizedMin.focusMode.dimOpacity, 0);
+  assert.strictEqual(sanitizedMin.focusMode.idleTimeout, 1);
+  assert.strictEqual(sanitizedMin.focusMode.transitionDuration, 0.1);
+});
+