perf(theme): improve scroll padding top

theme/src/client/composables/outline.ts

@@ -222,7 +222,7 @@ export function useActiveAnchor(container: Ref<HTMLElement | null>, marker: Ref<
     // find the last header above the top of viewport
     let activeLink: string | null = null
     for (const { link, top } of headers) {
-      if (top > scrollY + 92)
+      if (top > scrollY + 80)
         break
 
       activeLink = link
@@ -268,8 +268,10 @@ export function useActiveAnchor(container: Ref<HTMLElement | null>, marker: Ref<
   }, { debounce: 500 })
 
   onMounted(() => {
-    requestAnimationFrame(setActiveLink)
-    window.addEventListener('scroll', onScroll)
+    setTimeout(() => {
+      setActiveLink()
+      window.addEventListener('scroll', onScroll)
+    }, 1000)
   })
 
   onUpdated(() => {

theme/src/client/styles/normalize.css

@@ -23,16 +23,18 @@ html {
   font-size: 16px;
   line-height: 1.4;
 
-  scroll-padding-top: 0;
+  scroll-padding-top: 48px;
 }
 
 @media (min-width: 960px) {
   html {
-    scroll-padding-top: 80px;
+    scroll-padding-top: 112px;
   }
+}
 
-  html.layout-home {
-    scroll-padding-top: var(--vp-nav-height, 80px);
+@media (min-width: 1120px) {
+  html {
+    scroll-padding-top: 64px;
   }
 }