diff --git a/src/static_src/scss/_card-deck.scss b/src/static_src/scss/_card-deck.scss
index e1a021e..ef618e6 100644
--- a/src/static_src/scss/_card-deck.scss
+++ b/src/static_src/scss/_card-deck.scss
@@ -887,6 +887,18 @@ html:has(.sig-backdrop) {
     display: inline-flex;
 }
 
+// Sprint A.5 — hide FLIP btn during the flip animation. `data-flipping="1"`
+// is set on .sig-stage-card by _flipPolarityAnimated (polarized) AND
+// _flipToBackAnimated (non-polarized) for the 500ms animation duration; CSS
+// :has() selects the parent .my-sign-stage when any child carries that attr
+// and zeros the btn so it doesn't visually interfere w. the rotateY mid-spin.
+// Mirrors the tarot-fan view's pattern (`_card-deck.scss:459` —
+// `.tarot-fan-wrap:has(.fan-card[data-flipping]) .fan-flip-btn`).
+.my-sign-stage:has(.sig-stage-card[data-flipping]) .my-sign-flip-btn {
+    opacity: 0;
+    pointer-events: none;
+}
+
 // ─── Mini card grid ───────────────────────────────────────────────────────────
 // flex: 0 0 auto — shrinks to card content; no background (backdrop blur).
 // align-content: start prevents CSS grid from distributing extra height between rows.
diff --git a/src/templates/apps/billboard/my_sign.html b/src/templates/apps/billboard/my_sign.html
index 1e14e01..19e7bd8 100644
--- a/src/templates/apps/billboard/my_sign.html
+++ b/src/templates/apps/billboard/my_sign.html
@@ -42,9 +42,11 @@
             {# non-polarized decks). Pre-rendered back-image element; CSS    #}
             {# toggles visibility via `.sig-stage-card.is-flipped-to-back`.  #}
             {% if request.user.equipped_deck.has_card_images and not request.user.equipped_deck.is_polarized %}
+            {# No inline style — `.sig-stage-card-back-img` defaults to       #}
+            {# `display: none` via SCSS; `.sig-stage-card.is-flipped-to-back` #}
+            {# overrides to `display: block`. Inline would beat the toggle.  #}
             <img class="sig-stage-card-back-img" alt=""
-                 src="{{ request.user.equipped_deck.back_image_url }}"
-                 style="display:none">
+                 src="{{ request.user.equipped_deck.back_image_url }}">
             {% endif %}
             <div class="fan-card-corner fan-card-corner--tl">
                 <span class="fan-corner-rank"></span>
@@ -359,20 +361,38 @@
             });
         }
 
+        // Sprint A.5 — non-polarized FLIP animation. Mirrors the polarized
+        // `_flipPolarityAnimated` shape (rotateY-90 mid-spin + dataset.flipping
+        // for the duration so SCSS can hide the btn) but swaps a class
+        // toggle for the polarity revInput-flip at the halfway point.
+        function _flipToBackAnimated() {
+            if (!stageCard || stageCard.dataset.flipping) return;
+            stageCard.dataset.flipping = '1';
+            var rest = 'translateX(0px) rotateY(0deg) scale(1)';
+            var mid  = 'translateX(0px) rotateY(90deg) scale(1)';
+            stageCard.animate([
+                { transform: rest },
+                { transform: mid, offset: 0.5 },
+                { transform: rest },
+            ], { duration: 500, easing: 'ease' });
+            setTimeout(function () {
+                stageCard.classList.toggle('is-flipped-to-back');
+                if (flipBtn) flipBtn.classList.toggle(
+                    'is-reversed',
+                    stageCard.classList.contains('is-flipped-to-back')
+                );
+            }, 250);
+            setTimeout(function () { delete stageCard.dataset.flipping; }, 500);
+        }
+
         if (flipBtn) {
             flipBtn.addEventListener('click', function () {
                 if (!_currentCard) return;
-                // Sprint A.5 — non-polarized decks (Minchiate, RWS): FLIP
-                // shows the deck card-back instead of cycling polarity (no
-                // gravity/levity to toggle on these decks). Stat block stays
-                // unchanged — user spec 2026-05-25 PM. Polarized decks
-                // (Earthman) keep the existing polarity-flip animation.
+                // Non-polarized decks (Minchiate, RWS): FLIP shows the deck
+                // card-back; stat block stays unchanged — user spec 2026-05-25 PM.
+                // Polarized decks (Earthman) keep the existing polarity cycle.
                 if (pageEl.dataset.deckPolarized === 'false') {
-                    stageCard.classList.toggle('is-flipped-to-back');
-                    if (flipBtn) flipBtn.classList.toggle(
-                        'is-reversed',
-                        stageCard.classList.contains('is-flipped-to-back')
-                    );
+                    _flipToBackAnimated();
                 } else {
                     _flipPolarityAnimated();
                 }