diff --git a/src/apps/gameboard/tests/integrated/test_sea_visit.py b/src/apps/gameboard/tests/integrated/test_sea_visit.py
index 98d176b..8674fc6 100644
--- a/src/apps/gameboard/tests/integrated/test_sea_visit.py
+++ b/src/apps/gameboard/tests/integrated/test_sea_visit.py
@@ -459,3 +459,32 @@ class MySeaVoiceContextTest(TestCase):
         self.client.force_login(self.owner)
         ctx = self.client.get(reverse("my_sea")).context
         self.assertFalse(ctx["voice_active"])
+
+
+class MySeaSlotRankLongTest(TestCase):
+    """The 5+-char Roman-numeral squeeze (`--rank-long`) is now rendered
+    server-side in `_my_sea_slot.html`, matching sea.js's `_fillSlot` length>=5
+    rule — so a saved hand keeps the narrowed numeral across a refresh instead
+    of stretching back out (user-reported 2026-05-29)."""
+
+    def _render(self, corner_rank):
+        from django.template.loader import render_to_string
+        return render_to_string("apps/gameboard/_partials/_my_sea_slot.html", {
+            "position": "lay",
+            "crossing": False,
+            "saved": {
+                "card_id": 1, "polarity": "gravity", "reversed": False,
+                "has_card_images": False, "corner_rank": corner_rank,
+                "suit_icon": "", "arcana": "", "image_url": "", "name": "",
+            },
+        })
+
+    def test_long_numeral_gets_rank_long(self):
+        self.assertIn("sea-card-slot--rank-long", self._render("XLVIII"))
+
+    def test_short_numeral_has_no_rank_long(self):
+        self.assertNotIn("sea-card-slot--rank-long", self._render("IV"))
+
+    def test_exactly_five_chars_gets_rank_long(self):
+        # Boundary matches the JS (length >= 5).
+        self.assertIn("sea-card-slot--rank-long", self._render("XVIII"))
diff --git a/src/templates/apps/gameboard/_partials/_my_sea_slot.html b/src/templates/apps/gameboard/_partials/_my_sea_slot.html
index a97b0e4..c92bdde 100644
--- a/src/templates/apps/gameboard/_partials/_my_sea_slot.html
+++ b/src/templates/apps/gameboard/_partials/_my_sea_slot.html
@@ -8,7 +8,11 @@
 {#   crossing — bool; pass True for the cross slot (gets the        #}
 {#              `.sea-card-slot--crossing` modifier in iter-4a HTML) #}
 {% if saved %}
-    <div class="sea-card-slot sea-card-slot--filled sea-card-slot--visible sea-card-slot--{{ saved.polarity }}{% if saved.reversed %} sea-card-slot--reversed{% endif %}{% if crossing %} sea-card-slot--crossing{% endif %}{% if saved.has_card_images %} sea-card-slot--image{% endif %}"
+    {# `--rank-long` squeezes 5+-char Roman numerals (XVIII, XLVIII, …) so they #}
+    {# fit the slot. Added server-side here to MATCH sea.js's `_fillSlot`       #}
+    {# (length >= 5) — without it a saved hand stretched the numeral back out   #}
+    {# on refresh (JS-only before, user-reported 2026-05-29).                   #}
+    <div class="sea-card-slot sea-card-slot--filled sea-card-slot--visible sea-card-slot--{{ saved.polarity }}{% if saved.reversed %} sea-card-slot--reversed{% endif %}{% if crossing %} sea-card-slot--crossing{% endif %}{% if saved.has_card_images %} sea-card-slot--image{% endif %}{% if saved.corner_rank|length >= 5 %} sea-card-slot--rank-long{% endif %}"
          data-card-id="{{ saved.card_id }}"
          data-pos-key="{{ position }}"
          {% if saved.has_card_images %}data-arcana-key="{{ saved.arcana }}"{% endif %}>