diff --git a/components/sections/CloudRevealSection.tsx b/components/sections/CloudRevealSection.tsx
index 9c47325..e641ef7 100644
--- a/components/sections/CloudRevealSection.tsx
+++ b/components/sections/CloudRevealSection.tsx
@@ -81,8 +81,9 @@ export default function CloudRevealSection() {
 
     let rafId: number
     const loop = () => {
+      const rect = section.getBoundingClientRect()
       const totalHeight = section.offsetHeight - window.innerHeight
-      const scrolled = window.scrollY - section.offsetTop
+      const scrolled = -rect.top
       const progress = Math.max(0, Math.min(1, scrolled / totalHeight))
 
       const targetIdx = Math.min(