diff --git a/packages/super-editor/src/assets/styles/elements/prosemirror.css b/packages/super-editor/src/assets/styles/elements/prosemirror.css
index 5b806eed6d..b56f7f533f 100644
--- a/packages/super-editor/src/assets/styles/elements/prosemirror.css
+++ b/packages/super-editor/src/assets/styles/elements/prosemirror.css
@@ -226,21 +226,21 @@ https://github.com/ProseMirror/prosemirror-tables/blob/master/demo/index.html
 }
 
 .ProseMirror .track-insert-dec.highlighted {
-  border-top: 1px dashed #00853d;
-  border-bottom: 1px dashed #00853d;
-  background-color: #399c7222;
+  border-top: 1px dashed var(--sd-track-insert-border, #00853d);
+  border-bottom: 1px dashed var(--sd-track-insert-border, #00853d);
+  background-color: var(--sd-track-insert-bg, #399c7222);
 }
 
 .ProseMirror .track-delete-dec.highlighted {
-  border-top: 1px dashed #cb0e47;
-  border-bottom: 1px dashed #cb0e47;
-  background-color: #cb0e4722;
+  border-top: 1px dashed var(--sd-track-delete-border, #cb0e47);
+  border-bottom: 1px dashed var(--sd-track-delete-border, #cb0e47);
+  background-color: var(--sd-track-delete-bg, #cb0e4722);
   text-decoration: line-through !important;
   text-decoration-thickness: 2px !important;
 }
 
 .ProseMirror .track-format-dec.highlighted {
-  border-bottom: 2px solid gold;
+  border-bottom: 2px solid var(--sd-track-format-border, gold);
 }
 
 .ProseMirror .track-delete-widget {
diff --git a/packages/super-editor/src/assets/styles/extensions/comments.css b/packages/super-editor/src/assets/styles/extensions/comments.css
index 567b92fdea..9b4ab407e0 100644
--- a/packages/super-editor/src/assets/styles/extensions/comments.css
+++ b/packages/super-editor/src/assets/styles/extensions/comments.css
@@ -3,7 +3,7 @@
 }
 
 .sd-editor-comment-highlight:hover {
-  background-color: #1354ff55;
+  background-color: var(--sd-comment-highlight-hover, #1354ff55);
 }
 
 .sd-editor-comment-highlight.sd-custom-selection {
diff --git a/packages/super-editor/src/core/types/EditorConfig.ts b/packages/super-editor/src/core/types/EditorConfig.ts
index 0ed724ed78..020450298f 100644
--- a/packages/super-editor/src/core/types/EditorConfig.ts
+++ b/packages/super-editor/src/core/types/EditorConfig.ts
@@ -185,6 +185,20 @@ export interface EditorOptions {
   /** Whether comments are enabled */
   isCommentsEnabled?: boolean;
 
+  /** Comment highlight configuration */
+  comments?: {
+    highlightColors?: {
+      internal?: string;
+      external?: string;
+      activeInternal?: string;
+      activeExternal?: string;
+    };
+    highlightOpacity?: {
+      active?: number;
+      inactive?: number;
+    };
+  };
+
   /** Whether this is a new file */
   isNewFile?: boolean;
 
diff --git a/packages/super-editor/src/extensions/comment/comments-helpers.js b/packages/super-editor/src/extensions/comment/comments-helpers.js
index ff4969563e..feb062327c 100644
--- a/packages/super-editor/src/extensions/comment/comments-helpers.js
+++ b/packages/super-editor/src/extensions/comment/comments-helpers.js
@@ -718,10 +718,47 @@ export const translateFormatChangesToEnglish = (attrs = {}) => {
  * @param {EditorView} param0.editor The current editor view
  * @returns {String} The color to use for the highlight
  */
+const DEFAULT_ACTIVE_ALPHA = 0x44 / 0xff;
+const DEFAULT_INACTIVE_ALPHA = 0x22 / 0xff;
+
+const clampOpacity = (value) => {
+  if (!Number.isFinite(value)) return null;
+  return Math.max(0, Math.min(1, value));
+};
+
+const applyAlphaToHex = (color, opacity) => {
+  if (typeof color !== 'string') return color;
+  const match = color.match(/^#([0-9a-f]{3}|[0-9a-f]{6})$/i);
+  if (!match) return color;
+
+  const hex =
+    match[1].length === 3
+      ? match[1]
+          .split('')
+          .map((c) => c + c)
+          .join('')
+      : match[1];
+  const alpha = Math.round(opacity * 255)
+    .toString(16)
+    .padStart(2, '0');
+  return `#${hex}${alpha}`;
+};
+
 export const getHighlightColor = ({ activeThreadId, threadId, isInternal, editor }) => {
   if (!editor.options.isInternal && isInternal) return 'transparent';
   const pluginState = CommentsPluginKey.getState(editor.state);
-  const color = isInternal ? pluginState.internalColor : pluginState.externalColor;
-  const alpha = activeThreadId == threadId ? '44' : '22';
-  return `${color}${alpha}`;
+  const highlightColors = editor.options.comments?.highlightColors || {};
+  const highlightOpacity = editor.options.comments?.highlightOpacity || {};
+  const isActive = activeThreadId == threadId;
+
+  const baseColor = isInternal
+    ? (highlightColors.internal ?? pluginState.internalColor)
+    : (highlightColors.external ?? pluginState.externalColor);
+
+  const activeOverride = isInternal ? highlightColors.activeInternal : highlightColors.activeExternal;
+  if (isActive && activeOverride) return activeOverride;
+
+  const resolvedOpacity = clampOpacity(isActive ? highlightOpacity.active : highlightOpacity.inactive);
+  const opacity = resolvedOpacity ?? (isActive ? DEFAULT_ACTIVE_ALPHA : DEFAULT_INACTIVE_ALPHA);
+  return applyAlphaToHex(baseColor, opacity);
 };
diff --git a/packages/super-editor/src/extensions/comment/comments-plugin.js b/packages/super-editor/src/extensions/comment/comments-plugin.js
index 721e2ec2ed..024b7e6fda 100644
--- a/packages/super-editor/src/extensions/comment/comments-plugin.js
+++ b/packages/super-editor/src/extensions/comment/comments-plugin.js
@@ -314,10 +314,11 @@ export const CommentsPlugin = Extension.create({
 
       state: {
         init() {
+          const highlightColors = editor.options.comments?.highlightColors || {};
           return {
             activeThreadId: null,
-            externalColor: '#B1124B',
-            internalColor: '#078383',
+            externalColor: highlightColors.external ?? '#B1124B',
+            internalColor: highlightColors.internal ?? '#078383',
             decorations: DecorationSet.empty,
             allCommentPositions: {},
             allCommentIds: [],
diff --git a/packages/super-editor/src/extensions/comment/comments.test.js b/packages/super-editor/src/extensions/comment/comments.test.js
index 73a43f0dbe..687717144d 100644
--- a/packages/super-editor/src/extensions/comment/comments.test.js
+++ b/packages/super-editor/src/extensions/comment/comments.test.js
@@ -350,6 +350,64 @@ describe('comment helpers', () => {
     const hidden = getHighlightColor({ activeThreadId: null, threadId: 'thread-3', isInternal: true, editor });
     expect(hidden).toBe('transparent');
   });
+
+  it('uses configured highlight colors and opacity for inactive comments', () => {
+    const editor = {
+      options: {
+        isInternal: false,
+        comments: {
+          highlightColors: { external: '#112233' },
+          highlightOpacity: { inactive: 0.25 },
+        },
+      },
+      state: {},
+    };
+    vi.spyOn(CommentsPluginKey, 'getState').mockReturnValue({
+      internalColor: '#123456',
+      externalColor: '#abcdef',
+    });
+
+    const color = getHighlightColor({ activeThreadId: 'thread-2', threadId: 'thread-1', isInternal: false, editor });
+    expect(color).toBe('#11223340');
+  });
+
+  it('uses active highlight override color when provided', () => {
+    const editor = {
+      options: {
+        isInternal: false,
+        comments: {
+          highlightColors: { external: '#112233', activeExternal: '#ff0000' },
+        },
+      },
+      state: {},
+    };
+    vi.spyOn(CommentsPluginKey, 'getState').mockReturnValue({
+      internalColor: '#123456',
+      externalColor: '#abcdef',
+    });
+
+    const color = getHighlightColor({ activeThreadId: 'thread-1', threadId: 'thread-1', isInternal: false, editor });
+    expect(color).toBe('#ff0000');
+  });
+
+  it('falls back to plugin colors with custom opacity', () => {
+    const editor = {
+      options: {
+        isInternal: false,
+        comments: {
+          highlightOpacity: { active: 0.2 },
+        },
+      },
+      state: {},
+    };
+    vi.spyOn(CommentsPluginKey, 'getState').mockReturnValue({
+      internalColor: '#123456',
+      externalColor: '#abcdef',
+    });
+
+    const color = getHighlightColor({ activeThreadId: 'thread-1', threadId: 'thread-1', isInternal: false, editor });
+    expect(color).toBe('#abcdef33');
+  });
 });
 
 describe('comments plugin commands', () => {
diff --git a/packages/superdoc/src/SuperDoc.vue b/packages/superdoc/src/SuperDoc.vue
index 7b6988885f..16287c6329 100644
--- a/packages/superdoc/src/SuperDoc.vue
+++ b/packages/superdoc/src/SuperDoc.vue
@@ -105,9 +105,28 @@ const commentsModuleConfig = computed(() => {
   return config;
 });
 
-const superdocStyleVars = computed(() => ({
-  '--sd-ui-font-family': uiFontFamily.value,
-}));
+const superdocStyleVars = computed(() => {
+  const vars = {
+    '--sd-ui-font-family': uiFontFamily.value,
+  };
+
+  const commentsConfig = proxy.$superdoc.config.modules?.comments;
+  if (!commentsConfig || commentsConfig === false) return vars;
+
+  if (commentsConfig.highlightHoverColor) {
+    vars['--sd-comment-highlight-hover'] = commentsConfig.highlightHoverColor;
+  }
+
+  const trackChangeColors = commentsConfig.trackChangeHighlightColors || {};
+  const activeTrackChangeColors = commentsConfig.trackChangeActiveHighlightColors || trackChangeColors;
+  if (activeTrackChangeColors.insertBorder) vars['--sd-track-insert-border'] = activeTrackChangeColors.insertBorder;
+  if (activeTrackChangeColors.insertBackground) vars['--sd-track-insert-bg'] = activeTrackChangeColors.insertBackground;
+  if (activeTrackChangeColors.deleteBorder) vars['--sd-track-delete-border'] = activeTrackChangeColors.deleteBorder;
+  if (activeTrackChangeColors.deleteBackground) vars['--sd-track-delete-bg'] = activeTrackChangeColors.deleteBackground;
+  if (activeTrackChangeColors.formatBorder) vars['--sd-track-format-border'] = activeTrackChangeColors.formatBorder;
+
+  return vars;
+});
 
 // Refs
 const layers = ref(null);
@@ -448,6 +467,10 @@ const editorOptions = (doc) => {
     isCommentsEnabled: Boolean(commentsModuleConfig.value),
     isAiEnabled: proxy.$superdoc.config.modules?.ai,
     slashMenuConfig: proxy.$superdoc.config.modules?.slashMenu,
+    comments: {
+      highlightColors: commentsModuleConfig.value?.highlightColors,
+      highlightOpacity: commentsModuleConfig.value?.highlightOpacity,
+    },
     editorCtor: useLayoutEngine ? PresentationEditor : undefined,
     onBeforeCreate: onEditorBeforeCreate,
     onCreate: onEditorCreate,
diff --git a/packages/superdoc/src/core/types/index.js b/packages/superdoc/src/core/types/index.js
index 79efaa263f..0fb542db5f 100644
--- a/packages/superdoc/src/core/types/index.js
+++ b/packages/superdoc/src/core/types/index.js
@@ -51,6 +51,27 @@
  *   currentUser?: User | null,
  *   superdoc?: SuperDoc | null,
  * }) => boolean | undefined} [comments.permissionResolver] Custom permission resolver for comment actions
+ * @property {Object} [comments.highlightColors] Comment highlight colors (internal/external and active overrides)
+ * @property {string} [comments.highlightColors.internal] Base highlight color for internal comments
+ * @property {string} [comments.highlightColors.external] Base highlight color for external comments
+ * @property {string} [comments.highlightColors.activeInternal] Active highlight color override for internal comments
+ * @property {string} [comments.highlightColors.activeExternal] Active highlight color override for external comments
+ * @property {Object} [comments.highlightOpacity] Comment highlight opacity values (0-1)
+ * @property {number} [comments.highlightOpacity.active] Opacity for active comment highlight
+ * @property {number} [comments.highlightOpacity.inactive] Opacity for inactive comment highlight
+ * @property {string} [comments.highlightHoverColor] Hover highlight color for comment marks
+ * @property {Object} [comments.trackChangeHighlightColors] Track change highlight colors
+ * @property {string} [comments.trackChangeHighlightColors.insertBorder] Border color for inserted text highlight
+ * @property {string} [comments.trackChangeHighlightColors.insertBackground] Background color for inserted text highlight
+ * @property {string} [comments.trackChangeHighlightColors.deleteBorder] Border color for deleted text highlight
+ * @property {string} [comments.trackChangeHighlightColors.deleteBackground] Background color for deleted text highlight
+ * @property {string} [comments.trackChangeHighlightColors.formatBorder] Border color for format change highlight
+ * @property {Object} [comments.trackChangeActiveHighlightColors] Active track change highlight colors (defaults to trackChangeHighlightColors)
+ * @property {string} [comments.trackChangeActiveHighlightColors.insertBorder] Active border color for inserted text highlight
+ * @property {string} [comments.trackChangeActiveHighlightColors.insertBackground] Active background color for inserted text highlight
+ * @property {string} [comments.trackChangeActiveHighlightColors.deleteBorder] Active border color for deleted text highlight
+ * @property {string} [comments.trackChangeActiveHighlightColors.deleteBackground] Active background color for deleted text highlight
+ * @property {string} [comments.trackChangeActiveHighlightColors.formatBorder] Active border color for format change highlight
  * @property {Object} [ai] AI module configuration
  * @property {string} [ai.apiKey] Harbour API key for AI features
  * @property {string} [ai.endpoint] Custom endpoint URL for AI services