diff --git a/src/deck/useDeck.ts b/src/deck/useDeck.ts
index d5c3328..6cf2e17 100644
--- a/src/deck/useDeck.ts
+++ b/src/deck/useDeck.ts
@@ -12,7 +12,9 @@ export function useDeck(total: number) {
     return m ? clamp(parseInt(m[1], 10) - 1) : 0
   }
 
-  const index = ref(0)
+  // seed from the hash synchronously so deep links (…/#/7) land on the right
+  // slide at first paint — no flash of slide 1 and no on-load transition.
+  const index = ref(readHash())
   const direction = ref<1 | -1>(1)
 
   function goto(n: number) {
@@ -43,7 +45,6 @@ export function useDeck(total: number) {
   }
 
   onMounted(() => {
-    index.value = readHash()
     if (!window.location.hash) window.location.hash = '#/1'
     window.addEventListener('keydown', onKey)
     window.addEventListener('hashchange', onHash)