diff --git a/src/apps/gameboard/tests/integrated/test_views.py b/src/apps/gameboard/tests/integrated/test_views.py
index da04e6f..4726b6a 100644
--- a/src/apps/gameboard/tests/integrated/test_views.py
+++ b/src/apps/gameboard/tests/integrated/test_views.py
@@ -726,3 +726,74 @@ class MySeaSpreadFormTemplateTest(TestCase):
         self.assertIn('id="id_sea_del"', html)
         self.assertIn("sea-reversal-hint", html)
         self.assertIn("25% reversals", html)
+
+
+class MySeaDeckDataViewTest(TestCase):
+    """Sprint 5 iter 4a — view-level deck-data contract. `my_sea` view
+    embeds a shuffled deck (levity + gravity halves, current user's
+    significator excluded, reversal pre-rolled at ~25%) as JSON via
+    the `sea_deck_data` context key + `{{ ...|json_script }}` filter
+    in the template."""
+
+    def setUp(self):
+        from apps.epic.models import personal_sig_cards
+        self.user = User.objects.create(email="deck@test.io")
+        self.client.force_login(self.user)
+        self.target = personal_sig_cards(self.user)[0]
+        self.user.significator = self.target
+        self.user.save(update_fields=["significator"])
+
+    def test_context_sea_deck_data_has_two_polarity_halves(self):
+        response = self.client.get(reverse("my_sea"))
+        deck = response.context["sea_deck_data"]
+        self.assertIn("levity", deck)
+        self.assertIn("gravity", deck)
+        self.assertIsInstance(deck["levity"], list)
+        self.assertIsInstance(deck["gravity"], list)
+
+    def test_deck_data_excludes_user_significator(self):
+        response = self.client.get(reverse("my_sea"))
+        deck = response.context["sea_deck_data"]
+        all_ids = (
+            {c["id"] for c in deck["levity"]}
+            | {c["id"] for c in deck["gravity"]}
+        )
+        self.assertNotIn(self.target.id, all_ids)
+
+    def test_deck_data_halves_are_disjoint(self):
+        response = self.client.get(reverse("my_sea"))
+        deck = response.context["sea_deck_data"]
+        levity_ids = {c["id"] for c in deck["levity"]}
+        gravity_ids = {c["id"] for c in deck["gravity"]}
+        self.assertEqual(levity_ids & gravity_ids, set())
+
+    def test_deck_data_cards_carry_corner_rank_suit_icon_and_reversed(self):
+        # Card dict shape mirrors the gameroom `sea_deck` endpoint so
+        # iter 4b's persistence/render path can reuse the JSON contract.
+        response = self.client.get(reverse("my_sea"))
+        deck = response.context["sea_deck_data"]
+        any_card = (deck["levity"] + deck["gravity"])[0]
+        for key in ("id", "corner_rank", "suit_icon", "reversed"):
+            with self.subTest(key=key):
+                self.assertIn(key, any_card)
+        self.assertIsInstance(any_card["reversed"], bool)
+
+    def test_template_embeds_deck_as_json_script(self):
+        # Embed mechanism: `{{ sea_deck_data|json_script:"id_my_sea_deck" }}`
+        # gives a `<script type="application/json" id="id_my_sea_deck">`.
+        response = self.client.get(reverse("my_sea"))
+        self.assertContains(
+            response,
+            '<script id="id_my_sea_deck" type="application/json">',
+        )
+
+    def test_deck_data_empty_when_user_has_no_equipped_deck(self):
+        # Backup-deck branch: per [[sprint-my-sign-picker-may18h]] follow-
+        # up, no-deck users still proceed via Earthman. So deck_data falls
+        # back to Earthman, NOT empty. (Earthman seed is migration-loaded
+        # in this TestCase context.)
+        self.user.equipped_deck = None
+        self.user.save(update_fields=["equipped_deck"])
+        response = self.client.get(reverse("my_sea"))
+        deck = response.context["sea_deck_data"]
+        self.assertGreater(len(deck["levity"]) + len(deck["gravity"]), 0)
diff --git a/src/apps/gameboard/views.py b/src/apps/gameboard/views.py
index 4d9c8d0..987c7ca 100644
--- a/src/apps/gameboard/views.py
+++ b/src/apps/gameboard/views.py
@@ -198,10 +198,66 @@ def my_sea(request):
         # is a placeholder UI value pending the per-user setting.
         "default_spread": "situation-action-outcome",
         "reversals_pct": 25,
+        # Sprint 5 iter 4a — shuffled deck (levity + gravity halves, sig
+        # excluded) for the client-side card-draw mechanic. Embedded in
+        # the template via `{{ sea_deck_data|json_script:"..." }}`; JS
+        # reads on init + maintains the in-progress hand state client-
+        # side. Persistence (LOCK HAND → POST) lands in iter 4b.
+        "sea_deck_data": _my_sea_deck_data(request.user) if user_has_sig else {"levity": [], "gravity": []},
         "page_class": "page-gameboard page-my-sea",
     })
 
 
+def _my_sea_deck_data(user):
+    """Build the shuffled deck (levity + gravity halves) for the my-sea
+    picker's card-draw mechanic. Mirrors the gameroom `epic.views.sea_
+    deck` endpoint's card_dict shape so iter 4b's render/persist path
+    can reuse the same JSON contract.
+
+    Differences from the room version:
+    - No `room` context — exclude only the current user's significator
+      (no other seated gamers to worry about).
+    - Backup-deck fallthrough: if the user's `equipped_deck` is None,
+      fall back to Earthman (mirrors `personal_sig_cards`).
+    - Reversal probability hardcoded to 0.25 per the iter 3 spec lock;
+      future per-user config rides on the shared `stack_reversal_
+      probability` helper.
+    """
+    import random
+    from apps.epic.models import DeckVariant, TarotCard
+    deck = user.equipped_deck or DeckVariant.objects.filter(slug="earthman").first()
+    if not deck:
+        return {"levity": [], "gravity": []}
+    available = list(TarotCard.objects.filter(deck_variant=deck))
+    if user.significator_id:
+        available = [c for c in available if c.id != user.significator_id]
+    random.shuffle(available)
+    mid = len(available) // 2
+    reversal_prob = 0.25
+
+    def _card_dict(c):
+        return {
+            "id": c.id,
+            "name": c.name,
+            "arcana": c.arcana,
+            "suit": c.suit,
+            "number": c.number,
+            "corner_rank": c.corner_rank,
+            "suit_icon": c.suit_icon,
+            "name_group": c.name_group,
+            "name_title": c.name_title,
+            "levity_qualifier": c.levity_qualifier,
+            "gravity_qualifier": c.gravity_qualifier,
+            "reversal_qualifier": c.reversal_qualifier,
+            "reversed": random.random() < reversal_prob,
+        }
+
+    return {
+        "levity": [_card_dict(c) for c in available[:mid]],
+        "gravity": [_card_dict(c) for c in available[mid:]],
+    }
+
+
 @login_required(login_url="/")
 def tarot_fan(request, deck_id):
     from apps.epic.models import TarotCard
diff --git a/src/functional_tests/test_game_my_sea.py b/src/functional_tests/test_game_my_sea.py
index d569cd3..8d9ed1c 100644
--- a/src/functional_tests/test_game_my_sea.py
+++ b/src/functional_tests/test_game_my_sea.py
@@ -636,6 +636,232 @@ class MySeaSpreadFormTest(FunctionalTest):
             )
         return el
 
+
+class MySeaCardDrawTest(FunctionalTest):
+    """Sprint 5 iter 4a — client-side card-draw mechanics on the picker
+    phase. Server embeds the deck (gravity + levity halves, user's sig
+    excluded) as JSON; clicking GRAVITY/LEVITY swatch shows FLIP; FLIP
+    deposits the next card into the next DRAW_ORDER slot for the active
+    spread. DEL fully resets the in-progress hand. LOCK HAND enables
+    when the hand is complete + click locks down further interaction.
+    Switching spreads also resets the hand (the position-subset changes).
+
+    Server-side persistence (committing the locked hand to a MySeaDraw
+    model) defers to iter 4b."""
+
+    def setUp(self):
+        super().setUp()
+        _seed_earthman_sig_pile()
+        _seed_gameboard_applets()
+        self.email = "draw@test.io"
+        self.gamer = User.objects.create(email=self.email)
+        self.target_card = _assign_sig(self.gamer)
+
+    def _enter_picker_phase(self):
+        self.create_pre_authenticated_session(self.email)
+        self.browser.get(self.live_server_url + "/gameboard/my-sea/")
+        btn = self.wait_for(
+            lambda: self.browser.find_element(By.CSS_SELECTOR, "#id_draw_sea_btn")
+        )
+        btn.click()
+        return self.wait_for(
+            lambda: self.browser.find_element(
+                By.CSS_SELECTOR, ".my-sea-page[data-phase='picker']"
+            )
+        )
+
+    def _draw_one(self, picker, polarity):
+        """Click a polarity swatch + the FLIP btn that appears →
+        deposits a card. `polarity` is `'levity'` or `'gravity'`."""
+        stack = picker.find_element(
+            By.CSS_SELECTOR, f".sea-deck-stack--{polarity}"
+        )
+        stack.click()
+        flip = self.wait_for(
+            lambda: stack.find_element(By.CSS_SELECTOR, ".sea-stack-ok")
+        )
+        # FLIP btn becomes visible after the stack click; wait for it.
+        self.wait_for(lambda: self.assertTrue(flip.is_displayed()))
+        flip.click()
+
+    # ── Test 1 ───────────────────────────────────────────────────────────────
+
+    def test_deck_data_embedded_with_two_polarity_halves(self):
+        """Server-side renders the shuffled deck (levity + gravity
+        halves, sig excluded) inside `<script type="application/json"
+        id="id_my_sea_deck">`. Client-side JS reads on init."""
+        import json as _json
+        picker = self._enter_picker_phase()
+        data_el = picker.find_element(By.CSS_SELECTOR, "#id_my_sea_deck")
+        deck = _json.loads(data_el.get_attribute("textContent"))
+        self.assertIn("levity", deck)
+        self.assertIn("gravity", deck)
+        self.assertIsInstance(deck["levity"], list)
+        self.assertIsInstance(deck["gravity"], list)
+        # Both halves should be non-empty (16 court cards in the seed,
+        # minus 1 sig → 15 cards split ~7/8).
+        self.assertGreater(len(deck["levity"]) + len(deck["gravity"]), 0)
+        # No card appears in both halves.
+        levity_ids = {c["id"] for c in deck["levity"]}
+        gravity_ids = {c["id"] for c in deck["gravity"]}
+        self.assertEqual(levity_ids & gravity_ids, set())
+
+    # ── Test 2 ───────────────────────────────────────────────────────────────
+
+    def test_user_significator_excluded_from_drawn_deck(self):
+        """The user's significator (pinned in `.sea-pos-core`) must NOT
+        appear in the gravity or levity deck halves — would otherwise
+        let the same card show up twice in the layout."""
+        import json as _json
+        picker = self._enter_picker_phase()
+        data_el = picker.find_element(By.CSS_SELECTOR, "#id_my_sea_deck")
+        deck = _json.loads(data_el.get_attribute("textContent"))
+        all_ids = {c["id"] for c in deck["levity"]} | {c["id"] for c in deck["gravity"]}
+        self.assertNotIn(self.target_card.id, all_ids)
+
+    # ── Test 3 ───────────────────────────────────────────────────────────────
+
+    def test_levity_click_then_flip_deposits_card_into_first_sao_slot(self):
+        """Default spread = SAO; first slot = `.sea-pos-lay` per the
+        DRAW_ORDER spec. Clicking LEVITY → FLIP → the first drawn card
+        lands in lay's `.sea-card-slot` w. `--filled` + `--levity`
+        classes + corner_rank text content from the deck card."""
+        picker = self._enter_picker_phase()
+        self._draw_one(picker, "levity")
+        slot = self.wait_for(
+            lambda: picker.find_element(
+                By.CSS_SELECTOR,
+                ".sea-pos-lay .sea-card-slot.sea-card-slot--filled",
+            )
+        )
+        self.assertIn("sea-card-slot--levity", slot.get_attribute("class"))
+        # Card has a corner-rank rendered inside.
+        slot.find_element(By.CSS_SELECTOR, ".fan-corner-rank")
+        # Slot has a data-card-id attribute set to the deposited card's id.
+        self.assertTrue(slot.get_attribute("data-card-id"))
+
+    # ── Test 4 ───────────────────────────────────────────────────────────────
+
+    def test_two_draws_fill_first_two_slots_in_draw_order(self):
+        """SAO draw order = lay → cover → crown. Second draw lands in
+        `.sea-pos-cover` regardless of polarity. Polarity of each
+        slot reflects which swatch was clicked."""
+        picker = self._enter_picker_phase()
+        self._draw_one(picker, "levity")
+        self._draw_one(picker, "gravity")
+        # First slot (lay) — levity
+        lay = picker.find_element(
+            By.CSS_SELECTOR, ".sea-pos-lay .sea-card-slot.sea-card-slot--filled"
+        )
+        self.assertIn("sea-card-slot--levity", lay.get_attribute("class"))
+        # Second slot (cover) — gravity
+        cover = picker.find_element(
+            By.CSS_SELECTOR, ".sea-pos-cover .sea-card-slot.sea-card-slot--filled"
+        )
+        self.assertIn("sea-card-slot--gravity", cover.get_attribute("class"))
+
+    # ── Test 5 ───────────────────────────────────────────────────────────────
+
+    def test_lock_hand_enables_when_sao_hand_is_complete(self):
+        """LOCK HAND starts disabled; flips to enabled once all 3 SAO
+        positions are drawn (hand-size = 3 for any three-card spread)."""
+        picker = self._enter_picker_phase()
+        lock = picker.find_element(By.CSS_SELECTOR, "#id_sea_lock_hand")
+        self.assertEqual(lock.get_attribute("disabled"), "true")
+        self._draw_one(picker, "levity")
+        self._draw_one(picker, "levity")
+        # Two draws — still disabled.
+        self.assertEqual(lock.get_attribute("disabled"), "true")
+        self._draw_one(picker, "gravity")
+        # Third draw completes the SAO hand — LOCK HAND enables.
+        self.wait_for(
+            lambda: self.assertIsNone(lock.get_attribute("disabled"))
+        )
+
+    # ── Test 6 ───────────────────────────────────────────────────────────────
+
+    def test_del_click_resets_hand_and_disables_lock_hand(self):
+        """DEL fully resets — every filled slot returns to `--empty`,
+        labels re-render, _filled counter zeros, LOCK HAND disables."""
+        picker = self._enter_picker_phase()
+        self._draw_one(picker, "levity")
+        self._draw_one(picker, "gravity")
+        self.assertEqual(
+            len(picker.find_elements(
+                By.CSS_SELECTOR, ".sea-card-slot.sea-card-slot--filled"
+            )),
+            2,
+        )
+        delbtn = picker.find_element(By.CSS_SELECTOR, "#id_sea_del")
+        delbtn.click()
+        self.wait_for(
+            lambda: self.assertEqual(
+                len(picker.find_elements(
+                    By.CSS_SELECTOR, ".sea-card-slot.sea-card-slot--filled"
+                )),
+                0,
+            )
+        )
+        lock = picker.find_element(By.CSS_SELECTOR, "#id_sea_lock_hand")
+        self.assertEqual(lock.get_attribute("disabled"), "true")
+
+    # ── Test 7 ───────────────────────────────────────────────────────────────
+
+    def test_lock_hand_click_disables_further_interaction(self):
+        """After LOCK HAND fires, deck swatches + DEL btn + LOCK HAND
+        itself all carry the `.btn-disabled` class so the hand can't
+        be mutated further. Persistence (POST to a server endpoint)
+        defers to iter 4b — this test pins only the visual lock."""
+        picker = self._enter_picker_phase()
+        self._draw_one(picker, "levity")
+        self._draw_one(picker, "levity")
+        self._draw_one(picker, "gravity")
+        lock = picker.find_element(By.CSS_SELECTOR, "#id_sea_lock_hand")
+        self.wait_for(
+            lambda: self.assertIsNone(lock.get_attribute("disabled"))
+        )
+        lock.click()
+        # Picker carries a .my-sea-picker--locked class after LOCK HAND.
+        self.wait_for(
+            lambda: self.browser.find_element(
+                By.CSS_SELECTOR, ".my-sea-picker.my-sea-picker--locked"
+            )
+        )
+        # Swatches no longer respond — clicking them does nothing.
+        gravity_stack = picker.find_element(
+            By.CSS_SELECTOR, ".sea-deck-stack--gravity"
+        )
+        self.assertIn("btn-disabled", gravity_stack.get_attribute("class"))
+
+    # ── Test 8 ───────────────────────────────────────────────────────────────
+
+    def test_switching_spread_resets_in_progress_hand(self):
+        """Picking a different spread on the combobox mid-draw resets
+        the hand — different spreads use different position subsets +
+        different hand-sizes, so an in-progress hand can't carry over."""
+        picker = self._enter_picker_phase()
+        self._draw_one(picker, "levity")
+        self.assertEqual(
+            len(picker.find_elements(
+                By.CSS_SELECTOR, ".sea-card-slot.sea-card-slot--filled"
+            )),
+            1,
+        )
+        combo = picker.find_element(By.CSS_SELECTOR, "[data-combobox]")
+        combo.click()
+        picker.find_element(
+            By.CSS_SELECTOR,
+            ".sea-select-list [role='option'][data-value='mind-body-spirit']",
+        ).click()
+        self.wait_for(
+            lambda: self.assertEqual(
+                len(picker.find_elements(
+                    By.CSS_SELECTOR, ".sea-card-slot.sea-card-slot--filled"
+                )),
+                0,
+            )
+        )
+
     # ── Test 4 ───────────────────────────────────────────────────────────────
 
     def test_form_col_renders_decks_lock_hand_del_and_reversal_pct(self):
diff --git a/src/static_src/scss/_gameboard.scss b/src/static_src/scss/_gameboard.scss
index 49c14a0..c722640 100644
--- a/src/static_src/scss/_gameboard.scss
+++ b/src/static_src/scss/_gameboard.scss
@@ -371,3 +371,17 @@ body.page-gameboard {
     flex: 0 0 16rem;
     max-width: 16rem;
 }
+
+// LOCK HAND post-commit visual-lock: dim everything that mutates the
+// hand. `.btn-disabled` is the project's existing soft-disabled
+// treatment per [[feedback_btn_disabled_pointer_events]] — pointer-
+// events:none + opacity reduction. The deck stacks aren't buttons
+// themselves so we apply the class manually + the rule below ensures
+// they stop responding to clicks.
+.my-sea-picker--locked {
+    .sea-deck-stack.btn-disabled {
+        pointer-events: none;
+        opacity: 0.5;
+        cursor: default;
+    }
+}
diff --git a/src/templates/apps/gameboard/my_sea.html b/src/templates/apps/gameboard/my_sea.html
index 4696b39..2bb8ffd 100644
--- a/src/templates/apps/gameboard/my_sea.html
+++ b/src/templates/apps/gameboard/my_sea.html
@@ -181,6 +181,10 @@
                     </div>
                 </div>
             </div>
+            {# Sprint 5 iter 4a — shuffled deck (levity + gravity halves,  #}
+            {# sig excluded) embedded as JSON; JS reads on init and       #}
+            {# pops from the relevant pile on each deposit.                #}
+            {{ sea_deck_data|json_script:"id_my_sea_deck" }}
             <script src="{% static 'apps/epic/combobox.js' %}"></script>
             <script>
             (function () {
@@ -190,9 +194,6 @@
                 // specific order. The Celtic Cross variants share position
                 // labels (Crown/Beneath/Cover/Cross/Before/Behind — gameroom
                 // vocabulary) but differ in draw order.
-                //
-                // DRAW_ORDER feeds iter 4's deck-click-deposit logic; for
-                // iter 3 it's just baked-in metadata.
                 var DRAW_ORDER = {
                     'past-present-future':      ['leave', 'cover', 'loom'],
                     'situation-action-outcome': ['lay',   'cover', 'crown'],
@@ -211,7 +212,162 @@
                 };
                 var hidden = document.getElementById('id_sea_spread');
                 var cross  = document.querySelector('.my-sea-cross');
-                if (!hidden || !cross) return;
+                var picker = document.querySelector('.my-sea-picker');
+                var lockBtn= document.getElementById('id_sea_lock_hand');
+                var delBtn = document.getElementById('id_sea_del');
+                var deckEl = document.getElementById('id_my_sea_deck');
+                if (!hidden || !cross || !picker) return;
+
+                // ── Deck state ──────────────────────────────────────────
+                // `_deckData` is the immutable initial payload from the
+                // server; `_levityPile` + `_gravityPile` are working
+                // copies that pop one card per deposit. DEL re-clones
+                // from `_deckData` rather than re-fetching.
+                var _deckData = { levity: [], gravity: [] };
+                try { _deckData = JSON.parse((deckEl && deckEl.textContent) || '{}'); } catch (e) {}
+                var _levityPile  = (_deckData.levity  || []).slice();
+                var _gravityPile = (_deckData.gravity || []).slice();
+                var _filled = 0;
+                var _activeStack = null;
+                var _locked = false;
+
+                function _currentOrder() {
+                    return DRAW_ORDER[hidden.value] || [];
+                }
+
+                function _hideOk() {
+                    if (_activeStack) {
+                        var ok = _activeStack.querySelector('.sea-stack-ok');
+                        if (ok) ok.style.display = 'none';
+                        _activeStack.classList.remove('sea-deck-stack--active');
+                        _activeStack = null;
+                    }
+                }
+                function _showOk(stack) {
+                    _hideOk();
+                    _activeStack = stack;
+                    stack.classList.add('sea-deck-stack--active');
+                    var ok = stack.querySelector('.sea-stack-ok');
+                    if (ok) ok.style.display = '';
+                }
+
+                function _fillSlot(positionName, card, isLevity) {
+                    // Lifted from gameroom sea.js's `_fillSlot`: strip
+                    // .--empty + the position label, layer .--filled +
+                    // polarity classes, set corner-rank + suit-icon.
+                    var cell = cross.querySelector('.sea-pos-' + positionName);
+                    if (!cell) return;
+                    var slot = cell.querySelector('.sea-card-slot');
+                    if (!slot) return;
+                    slot.classList.remove('sea-card-slot--empty');
+                    slot.classList.add('sea-card-slot--filled');
+                    slot.classList.add(isLevity ? 'sea-card-slot--levity' : 'sea-card-slot--gravity');
+                    if (card.reversed) slot.classList.add('sea-card-slot--reversed');
+                    slot.dataset.cardId = String(card.id);
+                    slot.dataset.posKey = positionName;
+                    slot.innerHTML =
+                        '<span class="fan-corner-rank">' + (card.corner_rank || '') + '</span>' +
+                        (card.suit_icon ? '<i class="fa-solid ' + card.suit_icon + '"></i>' : '');
+                }
+
+                function _emptySlot(cell) {
+                    // DEL restores each filled slot to its initial empty
+                    // state w. the .sea-pos-label re-rendered inside.
+                    var slot = cell.querySelector('.sea-card-slot');
+                    if (!slot) return;
+                    slot.className = slot.className
+                        .split(' ')
+                        .filter(function (c) {
+                            return !/^sea-card-slot--(filled|visible|focused|levity|gravity|reversed|rank-long)$/.test(c);
+                        })
+                        .join(' ');
+                    slot.classList.add('sea-card-slot--empty');
+                    delete slot.dataset.cardId;
+                    delete slot.dataset.posKey;
+                    var posName = '';
+                    cell.classList.forEach(function (cls) {
+                        var m = /^sea-pos-(.+)$/.exec(cls);
+                        if (m && m[1] !== 'core' && m[1] !== 'label') posName = m[1];
+                    });
+                    var labels = POSITION_LABELS[hidden.value] || {};
+                    slot.innerHTML =
+                        '<span class="sea-pos-label" data-position="' + posName + '">' +
+                        (labels[posName] || '') +
+                        '</span>';
+                }
+
+                function _resetHand() {
+                    _filled = 0;
+                    _hideOk();
+                    cross.querySelectorAll(
+                        '.sea-crucifix-cell.sea-pos-crown, ' +
+                        '.sea-crucifix-cell.sea-pos-leave, ' +
+                        '.sea-crucifix-cell.sea-pos-loom, ' +
+                        '.sea-crucifix-cell.sea-pos-lay, ' +
+                        '.sea-pos-cover, .sea-pos-cross'
+                    ).forEach(_emptySlot);
+                    _levityPile  = (_deckData.levity  || []).slice();
+                    _gravityPile = (_deckData.gravity || []).slice();
+                    if (lockBtn) lockBtn.disabled = true;
+                }
+
+                function _setLocked(on) {
+                    _locked = on;
+                    picker.classList.toggle('my-sea-picker--locked', on);
+                    [picker.querySelector('.sea-deck-stack--levity'),
+                     picker.querySelector('.sea-deck-stack--gravity'),
+                     delBtn, lockBtn].forEach(function (el) {
+                        if (!el) return;
+                        el.classList.toggle('btn-disabled', on);
+                    });
+                    _hideOk();
+                }
+
+                // ── Deck-stack click → show FLIP → click FLIP → deposit ─
+                picker.querySelectorAll('.sea-deck-stack').forEach(function (stack) {
+                    stack.addEventListener('click', function (e) {
+                        if (_locked) return;
+                        e.stopPropagation();
+                        if (_activeStack === stack) _hideOk();
+                        else _showOk(stack);
+                    });
+                    var ok = stack.querySelector('.sea-stack-ok');
+                    if (ok) {
+                        ok.style.display = 'none';
+                        ok.addEventListener('click', function (e) {
+                            if (_locked) return;
+                            e.stopPropagation();
+                            var isLevity = stack.classList.contains('sea-deck-stack--levity');
+                            var pile     = isLevity ? _levityPile : _gravityPile;
+                            var card     = pile.length ? pile.shift() : null;
+                            var order    = _currentOrder();
+                            var posName  = order[_filled];
+                            if (card && posName) {
+                                _fillSlot(posName, card, isLevity);
+                                _filled++;
+                                if (lockBtn) lockBtn.disabled = (_filled < order.length);
+                            }
+                            _hideOk();
+                        });
+                    }
+                });
+
+                // Click elsewhere inside the picker dismisses the FLIP btn.
+                picker.addEventListener('click', _hideOk);
+
+                if (delBtn) {
+                    delBtn.addEventListener('click', function () {
+                        if (_locked) return;
+                        _resetHand();
+                    });
+                }
+                if (lockBtn) {
+                    lockBtn.addEventListener('click', function () {
+                        if (lockBtn.disabled) return;
+                        _setLocked(true);
+                    });
+                }
+
                 function syncLabels(spread) {
                     var labels = POSITION_LABELS[spread] || {};
                     cross.querySelectorAll('.sea-pos-label').forEach(function (el) {
@@ -222,10 +378,19 @@
                 function sync() {
                     cross.setAttribute('data-spread', hidden.value);
                     syncLabels(hidden.value);
+                    // Spread switch invalidates any in-progress hand —
+                    // position-subset + draw-order both change. Reset.
+                    _resetHand();
                 }
                 hidden.addEventListener('change', sync);
-                sync();
-                // Exposed for iter 4 (deck-click-deposit reads DRAW_ORDER).
+
+                // Initial state — labels already server-rendered for the
+                // default spread; we just zero the hand counter + ensure
+                // LOCK HAND starts disabled.
+                _filled = 0;
+                if (lockBtn) lockBtn.disabled = true;
+
+                // Exposed for iter 4b / future surfaces.
                 window._mySeaDrawOrder = DRAW_ORDER;
             }());
             </script>