diff --git a/web/src/reader/ui/progress-indicator.ts b/web/src/reader/ui/progress-indicator.ts
index f964a65..eb51dc2 100644
--- a/web/src/reader/ui/progress-indicator.ts
+++ b/web/src/reader/ui/progress-indicator.ts
@@ -113,7 +113,7 @@ function updateProgressDisplay(context: ReaderContext): void {
   let currentChapterPage = 0;
   let chapterPages = 0;
   if (state.currentReader.type === "ebook") {
-    const reader = state.currentReader as any;
+    const reader = state.currentReader;
 
     // Use currentPage directly if available (page-based navigation)
     if (reader.currentPage) {
@@ -123,15 +123,16 @@ function updateProgressDisplay(context: ReaderContext): void {
     }
 
     // Get total pages from calculation result
-    const pageInfo = reader.pageCalculationResult;
+    const pageInfo = reader.pagination;
     if (pageInfo && pageInfo.totalPages > 0) {
       totalPages = pageInfo.totalPages;
 
-      // Get chapter progress
-      const chapter = pageInfo.chapterMap.get(reader.currentSpineIndex);
-      if (chapter) {
-        currentChapterPage = currentPage - chapter.startPage + 1;
-        chapterPages = chapter.pagesInChapter;
+      // Get chapter progress from spine info
+      const spine = pageInfo.spineMap.get(reader.currentSpineIndex);
+      if (spine && spine.pages.length > 0) {
+        const chapterStartPage = spine.pages[0].pageIndex;
+        currentChapterPage = currentPage - chapterStartPage + 1;
+        chapterPages = spine.pages.length;
       }
     } else {
       // Fallback
@@ -145,8 +146,11 @@ function updateProgressDisplay(context: ReaderContext): void {
     totalPages = state.readerMetadata?.total_pages || 0;
   } else {
     // Comic/manga
-    currentPage = (state.currentReader as any).currentPage + 1;
-    totalPages = (state.currentReader as any).images?.length || 0;
+    const reader = state.currentReader;
+    if (reader.type === "comic" || reader.type === "manga") {
+      currentPage = reader.currentPage + 1;
+      totalPages = reader.images?.length || 0;
+    }
   }
   getReadingSpeed().then((speed) => {
     const result = calculateProgress(