diff --git a/packages/runtime/actor/setup.ts b/packages/runtime/actor/setup.ts
index a1967c0..89a2318 100644
--- a/packages/runtime/actor/setup.ts
+++ b/packages/runtime/actor/setup.ts
@@ -29,17 +29,24 @@ export const machineBase = setup({
      * Smooth-scroll the audience-mode viewport to the current slide.
      * Used as a side effect of navigation events (toolbar buttons,
      * keyboard, broadcast from the presenter tab) so the audience
-     * sees a clean animation between slides. No-op in presenter mode
-     * (no scrolling there) and on empty decks.
+     * sees a clean animation between slides.
+     *
+     * Scrolls the `<morkdeck-presentation>` container directly via
+     * scrollTo rather than slide.scrollIntoView. The slide-snap
+     * container's `scroll-snap-type: y mandatory` can race with
+     * scrollIntoView's smooth animation in some browsers, snapping
+     * instantly; calling scrollTo with an explicit offset gives the
+     * smooth path a direct, snap-friendly target.
      */
     scrollToSlide({ context }) {
       if (context.role !== "audience") return;
       if (context.slides.length === 0) return;
       const slide = context.slides[context.currentIndex];
       if (!slide) return;
-      document.querySelector(`#${slide.id}`)?.scrollIntoView({
-        behavior: "smooth",
-      });
+      const host = document.querySelector("morkdeck-presentation");
+      const target = document.getElementById(slide.id);
+      if (!host || !target) return;
+      host.scrollTo({ top: target.offsetTop, behavior: "smooth" });
     },
 
     /**
@@ -52,9 +59,10 @@ export const machineBase = setup({
       if (context.slides.length === 0) return;
       const slide = context.slides[context.currentIndex];
       if (!slide) return;
-      document.querySelector(`#${slide.id}`)?.scrollIntoView({
-        behavior: "instant",
-      });
+      const host = document.querySelector("morkdeck-presentation");
+      const target = document.getElementById(slide.id);
+      if (!host || !target) return;
+      host.scrollTo({ top: target.offsetTop, behavior: "instant" });
     },
     updateUrl({ context }) {
       const url = new URL(document.URL);