diff --git a/assets/css/frontend/forum/board.css b/assets/css/frontend/forum/board.css
index 2c6c02c9..039319e3 100644
--- a/assets/css/frontend/forum/board.css
+++ b/assets/css/frontend/forum/board.css
@@ -224,7 +224,7 @@
 .aksrt-forum-board__application-reason {
     margin: 10px 0;
     padding: 10px 12px;
-    border-left: 3px solid var(--color-primary, #1890ff);
+    border-left: 3px solid color-mix(in srgb, var(--color-primary) 55%, transparent);
     background: var(--surface-2, #f8fafc);
     color: var(--color-ink-3, #64748b);
     font-size: 13px;
@@ -240,7 +240,7 @@
     padding: 12px 16px;
     background: var(--surface-1, #fff);
     border-radius: 8px;
-    border-left: 3px solid var(--color-primary);
+    border-left: 3px solid color-mix(in srgb, var(--color-primary) 55%, transparent);
 }
 
 .aksrt-forum-board__sticky h3 {
diff --git a/assets/css/frontend/forum/compose.css b/assets/css/frontend/forum/compose.css
index e3d08ec8..77710245 100644
--- a/assets/css/frontend/forum/compose.css
+++ b/assets/css/frontend/forum/compose.css
@@ -489,8 +489,9 @@
 }
 
 .aksrt-forum-compose__draft:hover {
-    border-color: var(--color-primary);
+    border-color: color-mix(in srgb, var(--color-primary) 45%, var(--color-line, #e5e7eb));
     color: var(--color-primary);
+    background: var(--color-primary-softer, color-mix(in srgb, var(--color-primary) 6%, transparent));
 }
 
 /* ── topic cover (§7.3) ── */
@@ -646,7 +647,7 @@
 }
 
 .aksrt-forum-compose__cover-btn:hover {
-    border-color: var(--color-primary);
+    border-color: color-mix(in srgb, var(--color-primary) 45%, var(--color-line, #e5e7eb));
     color: var(--color-primary);
     background: var(--color-primary-soft);
 }
diff --git a/assets/css/frontend/forum/extras/additional-role-badges.css b/assets/css/frontend/forum/extras/additional-role-badges.css
index f732d747..b02887c9 100644
--- a/assets/css/frontend/forum/extras/additional-role-badges.css
+++ b/assets/css/frontend/forum/extras/additional-role-badges.css
@@ -43,7 +43,7 @@
 }
 
 .aksrt-forum-reply.is-pinned {
-    border-left: 3px solid #1890ff;
+    border-left: 3px solid color-mix(in srgb, var(--color-primary) 55%, transparent);
 }
 
 .aksrt-forum-reply.is-pinned.is-hot {
diff --git a/assets/css/frontend/forum/extras/base.css b/assets/css/frontend/forum/extras/base.css
index 5432556c..645983f7 100644
--- a/assets/css/frontend/forum/extras/base.css
+++ b/assets/css/frontend/forum/extras/base.css
@@ -253,7 +253,7 @@
 
 .aksrt-forum-topic__badge--question {
     background: #e6f7ff;
-    color: #1890ff;
+    color: var(--color-primary);
 }
 
 .aksrt-forum-topic__badge--solved {
@@ -263,7 +263,7 @@
 
 .aksrt-forum-topic-item__badge--question {
     background: #e6f7ff;
-    color: #1890ff;
+    color: var(--color-primary);
 }
 
 .aksrt-forum-topic-item__badge--solved {
@@ -328,8 +328,8 @@
 }
 
 .aksrt-forum-topic__score-btn:hover:not(:disabled) {
-    border-color: var(--color-primary, #1890ff);
-    color: var(--color-primary, #1890ff);
+    border-color: color-mix(in srgb, var(--color-primary) 45%, var(--color-line, #e5e7eb));
+    color: var(--color-primary);
 }
 
 .aksrt-forum-topic__score-btn--up:hover:not(:disabled) {
@@ -372,7 +372,7 @@
 .aksrt-forum-topic__vote-type-badge {
     display: inline-block;
     padding: 1px 6px;
-    background: var(--color-primary, #1890ff);
+    background: var(--color-primary);
     color: #fff;
     border-radius: var(--radius-pill, 999px);
     font-size: 11px;
@@ -401,7 +401,7 @@
 
 .aksrt-forum-topic__chip--topic-cat {
     background: var(--color-primary-bg, #e6f7ff);
-    color: var(--color-primary, #1890ff);
+    color: var(--color-primary);
     font-weight: 600;
 }
 
diff --git a/assets/css/frontend/forum/extras/like-button.css b/assets/css/frontend/forum/extras/like-button.css
index 7fd51987..fd7099ce 100644
--- a/assets/css/frontend/forum/extras/like-button.css
+++ b/assets/css/frontend/forum/extras/like-button.css
@@ -14,11 +14,11 @@
 }
 
 .aksrt-forum-reply__like-btn:hover {
-    color: var(--c-primary, #1890ff);
+    color: var(--color-primary);
 }
 
 .aksrt-forum-reply__like-btn.is-active {
-    color: var(--c-primary, #1890ff);
+    color: var(--color-primary);
 }
 
 .aksrt-forum-reply__like-count {
diff --git a/assets/css/frontend/forum/extras/load-more.css b/assets/css/frontend/forum/extras/load-more.css
index dd19e8e7..9a201bc9 100644
--- a/assets/css/frontend/forum/extras/load-more.css
+++ b/assets/css/frontend/forum/extras/load-more.css
@@ -17,7 +17,7 @@
 }
 
 .aksrt-forum-replies__more-btn:hover {
-    border-color: var(--c-primary, #1890ff);
-    color: var(--c-primary, #1890ff);
+    border-color: color-mix(in srgb, var(--color-primary) 45%, var(--color-line, #e5e7eb));
+    color: var(--color-primary);
 }
 
diff --git a/assets/css/frontend/forum/extras/quick-post-bar.css b/assets/css/frontend/forum/extras/quick-post-bar.css
index 5fddff0c..8e151fe1 100644
--- a/assets/css/frontend/forum/extras/quick-post-bar.css
+++ b/assets/css/frontend/forum/extras/quick-post-bar.css
@@ -19,8 +19,8 @@
 }
 
 .aksrt-forum-quick-post__input:hover {
-    border-color: var(--c-primary, #1890ff);
-    box-shadow: 0 0 0 2px rgba(24, 144, 255, .1);
+    border-color: color-mix(in srgb, var(--color-primary) 45%, var(--color-line, #e5e7eb));
+    box-shadow: 0 0 0 3px color-mix(in srgb, var(--color-primary) 18%, transparent);
 }
 
 .aksrt-forum-quick-post__input img {
diff --git a/assets/css/frontend/forum/extras/reply-action-buttons.css b/assets/css/frontend/forum/extras/reply-action-buttons.css
index d196c3d1..7118ef22 100644
--- a/assets/css/frontend/forum/extras/reply-action-buttons.css
+++ b/assets/css/frontend/forum/extras/reply-action-buttons.css
@@ -16,7 +16,7 @@
 
 .aksrt-forum-reply__reply-btn:hover,
 .aksrt-forum-reply__top-btn:hover {
-    color: var(--c-primary, #1890ff);
+    color: var(--color-primary);
 }
 
 /* ── §7.3 Hidden content block [aksrt_hide] ── */
@@ -80,13 +80,13 @@
 
 .aksrt-forum-home-tabs__btn:hover {
     color: var(--c-text-1, #333);
-    border-color: var(--c-primary, #1890ff);
+    border-color: color-mix(in srgb, var(--color-primary) 45%, var(--color-line, #e5e7eb));
 }
 
 .aksrt-forum-home-tabs__btn.is-active {
-    background: var(--c-primary, #1890ff);
+    background: var(--color-primary);
     color: #fff;
-    border-color: var(--c-primary, #1890ff);
+    border-color: color-mix(in srgb, var(--color-primary) 45%, var(--color-line, #e5e7eb));
 }
 
 .aksrt-forum-home-tabs__badge {
diff --git a/assets/css/frontend/forum/extras/reply-header-tabs-filters.css b/assets/css/frontend/forum/extras/reply-header-tabs-filters.css
index 60655ed8..5bb6e20f 100644
--- a/assets/css/frontend/forum/extras/reply-header-tabs-filters.css
+++ b/assets/css/frontend/forum/extras/reply-header-tabs-filters.css
@@ -30,13 +30,13 @@
 
 .aksrt-forum-replies__tab:hover {
     color: var(--c-text-1, #333);
-    border-color: var(--c-primary, #1890ff);
+    border-color: color-mix(in srgb, var(--color-primary) 45%, var(--color-line, #e5e7eb));
 }
 
 .aksrt-forum-replies__tab.is-active {
-    background: var(--c-primary, #1890ff);
+    background: var(--color-primary);
     color: #fff;
-    border-color: var(--c-primary, #1890ff);
+    border-color: color-mix(in srgb, var(--color-primary) 45%, var(--color-line, #e5e7eb));
 }
 
 .aksrt-forum-replies__filter {
diff --git a/assets/css/frontend/forum/topic.css b/assets/css/frontend/forum/topic.css
index c0fca127..82bb2fdd 100644
--- a/assets/css/frontend/forum/topic.css
+++ b/assets/css/frontend/forum/topic.css
@@ -266,7 +266,10 @@
 }
 
 .aksrt-forum-topic__vote-option.is-selected {
-    outline: 1px solid var(--color-primary);
+    outline: none;
+    border-color: color-mix(in srgb, var(--color-primary) 45%, var(--color-line, #e5e7eb));
+    background: var(--color-primary-soft, color-mix(in srgb, var(--color-primary) 12%, transparent));
+    box-shadow: 0 0 0 3px color-mix(in srgb, var(--color-primary) 18%, transparent);
 }
 
 .aksrt-forum-topic__vote-count {
diff --git a/assets/css/frontend/pages/topic-rows.css b/assets/css/frontend/pages/topic-rows.css
index fe6336e7..6aeafc37 100644
--- a/assets/css/frontend/pages/topic-rows.css
+++ b/assets/css/frontend/pages/topic-rows.css
@@ -17,7 +17,8 @@
 }
 
 .aksrt-forum-topic-row:hover {
-  border-color: var(--color-primary);
+  border-color: color-mix(in srgb, var(--color-primary) 45%, var(--color-line, #e5e7eb));
+  box-shadow: var(--shadow-sm);
 }
 
 .aksrt-forum-topic-row__avatar img {
diff --git a/assets/css/frontend/product-archive.css b/assets/css/frontend/product-archive.css
index 91ae9662..fdc26368 100644
--- a/assets/css/frontend/product-archive.css
+++ b/assets/css/frontend/product-archive.css
@@ -87,7 +87,7 @@
 .aksrt-product-card:hover {
     transform: translateY(-3px);
     box-shadow: 0 4px 12px rgba(0, 0, 0, 0.08);
-    border-color: var(--color-primary, var(--color-primary));
+    border-color: color-mix(in srgb, var(--color-primary) 45%, var(--color-line, #e5e7eb));
 }
 
 .aksrt-product-card__link {
@@ -205,13 +205,13 @@
 }
 
 .aksrt-product-archive__pagination .page-numbers:hover {
-    border-color: var(--color-primary, var(--color-primary));
+    border-color: color-mix(in srgb, var(--color-primary) 45%, var(--color-line, #e5e7eb));
     color: var(--color-primary, var(--color-primary));
 }
 
 .aksrt-product-archive__pagination .page-numbers.current {
     background: var(--color-primary, var(--color-primary));
-    border-color: var(--color-primary, var(--color-primary));
+    border-color: color-mix(in srgb, var(--color-primary) 45%, var(--color-line, #e5e7eb));
     color: #fff;
 }
 
@@ -506,7 +506,7 @@
 }
 
 .aksrt-cart__qty-btn:hover {
-    border-color: var(--color-primary, var(--color-primary));
+    border-color: color-mix(in srgb, var(--color-primary) 45%, var(--color-line, #e5e7eb));
 }
 
 .aksrt-cart__item-subtotal {
@@ -675,7 +675,8 @@
 .aksrt-product-edit__field input:focus,
 .aksrt-product-edit__field textarea:focus {
     outline: none;
-    border-color: var(--color-primary, var(--color-primary));
+  border-color: color-mix(in srgb, var(--color-primary) 45%, var(--color-line, #e5e7eb));
+  box-shadow: 0 0 0 3px color-mix(in srgb, var(--color-primary) 18%, transparent);
 }
 
 .aksrt-product-edit__field textarea {
@@ -717,7 +718,7 @@
 }
 
 .aksrt-product-edit__actions .btn-ghost:hover {
-    border-color: var(--color-primary, var(--color-primary));
+    border-color: color-mix(in srgb, var(--color-primary) 45%, var(--color-line, #e5e7eb));
 }
 
 .aksrt-product-archive__toolbar{display:flex;flex-wrap:wrap;gap:8px;margin:0 0 16px}
diff --git a/assets/css/routes/cart.css b/assets/css/routes/cart.css
index 9e7e8e71..c7035b0e 100644
--- a/assets/css/routes/cart.css
+++ b/assets/css/routes/cart.css
@@ -389,3 +389,12 @@
   gap: 12px;
   padding-top: 8px;
 }
+
+/* Soft focus ring (#77 recipe) — avoid hard primary stroke */
+.aksrt-cart-page__input:focus,
+.aksrt-cart-page__textarea:focus,
+.aksrt-cart-page__qty-btn:focus-visible {
+  outline: none;
+  border-color: color-mix(in srgb, var(--color-primary) 45%, var(--color-line, #e5e7eb));
+  box-shadow: 0 0 0 3px color-mix(in srgb, var(--color-primary) 18%, transparent);
+}
diff --git a/assets/css/routes/commerce.css b/assets/css/routes/commerce.css
index 21368a44..fe9e4131 100644
--- a/assets/css/routes/commerce.css
+++ b/assets/css/routes/commerce.css
@@ -43,13 +43,13 @@
 
 .aksrt-commerce-header__nav-item:hover {
   color: var(--color-primary, #f04494);
-  border-color: color-mix(in srgb, var(--color-primary, #f04494) 35%, transparent);
+  border-color: color-mix(in srgb, var(--color-primary, #f04494) 45%, transparent);
 }
 
 .aksrt-commerce-header__nav-item.is-active {
   color: var(--color-on-primary, #fff);
   background: var(--color-primary, #f04494);
-  border-color: var(--color-primary, #f04494);
+  border-color: transparent;
 }
 
 /* Soften revenue dashboard cards — task-first, not ops console */
diff --git a/assets/css/routes/product.css b/assets/css/routes/product.css
index beeedf78..153f5094 100644
--- a/assets/css/routes/product.css
+++ b/assets/css/routes/product.css
@@ -100,7 +100,7 @@
 
 .aksrt-product-page__thumb:hover,
 .aksrt-product-page__thumb.is-active {
-  border-color: var(--color-primary);
+  border-color: color-mix(in srgb, var(--color-primary) 45%, var(--color-line, #e5e7eb));
 }
 
 .aksrt-product-page__thumb img {
@@ -227,8 +227,8 @@
 .aksrt-product-editor__input:focus,
 .aksrt-product-editor__textarea:focus {
   outline: none;
-  border-color: var(--color-primary);
-  box-shadow: 0 0 0 3px var(--color-primary-soft);
+  border-color: color-mix(in srgb, var(--color-primary) 45%, var(--color-line, #e5e7eb));
+  box-shadow: 0 0 0 3px color-mix(in srgb, var(--color-primary) 18%, transparent);
 }
 
 /* ===== Quantity controls ===== */
@@ -244,7 +244,7 @@
 }
 
 .aksrt-product-page__qty-btn:hover {
-  border-color: var(--color-primary);
+  border-color: color-mix(in srgb, var(--color-primary) 45%, var(--color-line, #e5e7eb));
   background: var(--color-primary-softer);
 }
 
@@ -425,13 +425,13 @@ html.dark .aksrt-product-page__content img {
 }
 
 .aksrt-product-page__spec-btn:hover {
-  border-color: var(--color-primary);
+  border-color: color-mix(in srgb, var(--color-primary) 45%, var(--color-line, #e5e7eb));
   color: var(--color-primary);
 }
 
 .aksrt-product-page__spec-btn.is-active {
   background: var(--color-primary-soft);
-  border-color: var(--color-primary);
+  border-color: color-mix(in srgb, var(--color-primary) 45%, var(--color-line, #e5e7eb));
   color: var(--color-primary);
   font-weight: 600;
 }
diff --git a/assets/js/forum-governance.js b/assets/js/forum-governance.js
index 3b348bc0..61216627 100644
--- a/assets/js/forum-governance.js
+++ b/assets/js/forum-governance.js
@@ -675,6 +675,49 @@
         });
     }
 
+    function bindPurchaseButton(button) {
+        button.addEventListener('click', function () {
+            var topicId = parseInt(button.getAttribute('data-topic-id') || '0', 10);
+            var price = button.getAttribute('data-price') || '0';
+            var isFree = button.getAttribute('data-free') === '1';
+            var feedback = button.parentElement ? button.parentElement.querySelector('.js-aksrt-action-feedback') : null;
+
+            if (!topicId) {
+                return;
+            }
+
+            var confirmMsg = isFree
+                ? '确认使用 VIP 免费解锁此主题？'
+                : ('确认使用余额支付 ¥' + price + ' 购买此主题？');
+            if (!window.confirm(confirmMsg)) {
+                return;
+            }
+
+            button.disabled = true;
+            setFeedback(feedback, isFree ? '正在解锁…' : '正在支付…', 'is-loading');
+
+            var data = new FormData();
+            data.append('action', 'aksrt_forum_purchase_topic');
+            data.append('topic_id', topicId);
+            data.append('_nonce', rootData.forumNonce || '');
+
+            fetch((rootData.ajaxUrl || '/wp-admin/admin-ajax.php'), {
+                method: 'POST',
+                body: data,
+                credentials: 'same-origin',
+            }).then(function (r) { return r.json(); }).then(function (payload) {
+                if (!payload.success) {
+                    throw new Error((payload.data && payload.data.message) || '购买失败');
+                }
+                setFeedback(feedback, '购买成功，正在刷新…', 'is-success');
+                setTimeout(function () { window.location.reload(); }, 800);
+            }).catch(function (error) {
+                setFeedback(feedback, error.message || '购买失败', 'is-error');
+                button.disabled = false;
+            });
+        });
+    }
+
     function bindComposeCoverToggle(form) {
         var coverTypeSelect = form.querySelector('#compose-cover-type');
         var imageField = form.querySelector('#compose-cover-image-field');
@@ -1411,6 +1454,7 @@
         document.querySelectorAll('.js-aksrt-topic-score').forEach(bindScoreButton);
         document.querySelectorAll('.js-aksrt-adopt-answer').forEach(bindAdoptButton);
         document.querySelectorAll('.js-aksrt-unlock-topic').forEach(bindUnlockButton);
+        document.querySelectorAll('.js-aksrt-purchase-topic').forEach(bindPurchaseButton);
         bindForumCommentEngine();
         bindForumHomeTabs();
         bindBoardSortTabs();
diff --git a/inc/classes/class-aksrt-credits.php b/inc/classes/class-aksrt-credits.php
index c67ba073..8e34d967 100644
--- a/inc/classes/class-aksrt-credits.php
+++ b/inc/classes/class-aksrt-credits.php
@@ -33,6 +33,13 @@ class AKSRT_Credits {
         return is_numeric($val) ? (int) $val : 0;
     }
 
+    /**
+     * Alias used by forum unlock/purchase paths.
+     */
+    public static function get_balance(int $user_id): int {
+        return self::balance($user_id);
+    }
+
     /**
      * 增加积分。
      *
diff --git a/inc/classes/class-aksrt-forum.php b/inc/classes/class-aksrt-forum.php
index 451e33f5..64211289 100644
--- a/inc/classes/class-aksrt-forum.php
+++ b/inc/classes/class-aksrt-forum.php
@@ -144,6 +144,13 @@ class AKSRT_Forum {
         return ['enabled' => false];
     }
 
+    /**
+     * Alias kept for topic-service helpers that still call get_forum_config().
+     */
+    public function get_forum_config(): array {
+        return $this->get_config();
+    }
+
     public function get_boards(array $args = []): array {
         return $this->board_service()->get_boards($args);
     }
@@ -345,6 +352,7 @@ class AKSRT_Forum {
         add_action('wp_ajax_aksrt_forum_create_topic', [$this, 'ajax_create_topic']);
         add_action('wp_ajax_aksrt_forum_follow_plate', [$this, 'ajax_follow_plate']);
         add_action('wp_ajax_aksrt_forum_unlock_topic', [$this, 'ajax_unlock_topic']);
+        add_action('wp_ajax_aksrt_forum_purchase_topic', [$this, 'ajax_purchase_topic']);
 
         // §7.4 draft persistence
         add_action('wp_ajax_aksrt_forum_save_draft', [$this, 'ajax_save_draft']);
@@ -446,6 +454,26 @@ class AKSRT_Forum {
         $this->topic_service()->ajax_unlock_topic();
     }
 
+    public function ajax_purchase_topic(): void {
+        $this->topic_service()->ajax_purchase_topic();
+    }
+
+    /**
+     * Lightweight result helper for topic service actions.
+     *
+     * @return array{success:bool,message:string}
+     */
+    public function success(string $message = '', array $extra = []): array {
+        return array_merge(['success' => true, 'message' => $message], $extra);
+    }
+
+    /**
+     * @return array{success:bool,message:string}
+     */
+    public function error(string $message = '', array $extra = []): array {
+        return array_merge(['success' => false, 'message' => $message], $extra);
+    }
+
     public function apply_moderator(int $user_id, int $board_id, string $reason) {
         return $this->moderation_service()->apply_moderator($user_id, $board_id, $reason);
     }
diff --git a/inc/classes/forum/topic-service-traits/trait-aksrt-forum-topic-service-part-3.php b/inc/classes/forum/topic-service-traits/trait-aksrt-forum-topic-service-part-3.php
index 8f1b85d7..ea1f5d9c 100644
--- a/inc/classes/forum/topic-service-traits/trait-aksrt-forum-topic-service-part-3.php
+++ b/inc/classes/forum/topic-service-traits/trait-aksrt-forum-topic-service-part-3.php
@@ -188,7 +188,7 @@ trait AKSRT_Forum_Topic_Service_Part_3 {
             if ($viewer_user_id <= 0) {
                 return false;
             }
-            return $this->has_user_unlocked_topic($viewer_user_id, (int) $post->ID);
+            return $this->has_user_paid_topic($viewer_user_id, (int) $post->ID);
         }
 
         if ($visibility === AKSRT_Forum::VISIBILITY_MODERATOR) {
@@ -324,16 +324,12 @@ trait AKSRT_Forum_Topic_Service_Part_3 {
             'topic_id' => $topic_id,
         ], sprintf(__('解锁帖子「%s」', 'aksrt'), get_the_title($topic_id)));
 
-        if (!$deducted) {
-            return $this->forum->error(__('积分扣除失败', 'aksrt'));
+        if (is_wp_error($deducted) || $deducted === false) {
+            $msg = is_wp_error($deducted) ? $deducted->get_error_message() : __('积分扣除失败', 'aksrt');
+            return $this->forum->error($msg ?: __('积分扣除失败', 'aksrt'));
         }
 
-        $unlocked = get_user_meta($user_id, 'aksrt_unlocked_topics', true);
-        if (!is_array($unlocked)) {
-            $unlocked = [];
-        }
-        $unlocked[] = $topic_id;
-        update_user_meta($user_id, 'aksrt_unlocked_topics', array_unique($unlocked));
+        $this->mark_topic_unlocked($user_id, $topic_id);
 
         $author_id = (int) $post->post_author;
         if ($author_id > 0 && $author_id !== $user_id) {
@@ -350,12 +346,211 @@ trait AKSRT_Forum_Topic_Service_Part_3 {
         return $this->forum->success(__('解锁成功', 'aksrt'));
     }
 
+    /**
+     * Cash/balance purchase for VISIBILITY_PAY topics.
+     *
+     * Reuses AKSRT_Order product_type=resource + balance credits conversion
+     * (1 CNY = 100 credits, same as AKSRT_Balance_Gateway).
+     *
+     * @return array{success:bool,message:string}
+     */
+    public function purchase_topic_with_balance(int $user_id, int $topic_id): array {
+        $post = get_post($topic_id);
+        if (!$post || $post->post_type !== 'aksrt_forum_topic') {
+            return $this->forum->error(__('主题不存在', 'aksrt'));
+        }
+
+        if ($user_id <= 0) {
+            return $this->forum->error(__('请先登录', 'aksrt'));
+        }
+
+        $visibility = (string) get_post_meta($topic_id, '_aksrt_visibility', true);
+        if ($visibility !== AKSRT_Forum::VISIBILITY_PAY) {
+            return $this->forum->error(__('该主题不是付费可见内容', 'aksrt'));
+        }
+
+        if ($this->has_user_paid_topic($user_id, $topic_id)) {
+            return $this->forum->success(__('已购买', 'aksrt'));
+        }
+
+        $price = $this->resolve_topic_pay_price($topic_id, $user_id);
+        if (!empty($price['is_free'])) {
+            $this->mark_topic_unlocked($user_id, $topic_id);
+            return $this->forum->success(__('VIP 免费解锁成功', 'aksrt'), [
+                'amount' => 0,
+                'free' => true,
+            ]);
+        }
+
+        $amount = (float) ($price['amount'] ?? 0);
+        if ($amount <= 0) {
+            return $this->forum->error(__('价格未设置', 'aksrt'));
+        }
+
+        if (!class_exists('AKSRT_Order') || !class_exists('AKSRT_Credits')) {
+            return $this->forum->error(__('支付系统不可用', 'aksrt'));
+        }
+
+        $product_type = class_exists('AKSRT_Domain_Model')
+            ? AKSRT_Domain_Model::ORDER_PRODUCT_RESOURCE
+            : 'resource';
+
+        $order_number = AKSRT_Order::get_instance()->create($user_id, $product_type, $topic_id, $amount, 'CNY');
+        if ($order_number === '') {
+            return $this->forum->error(__('创建订单失败', 'aksrt'));
+        }
+
+        // Align with AKSRT_Balance_Gateway: 1 CNY = 100 credits.
+        $credits_cost = (int) ceil($amount * 100);
+        $balance = AKSRT_Credits::get_balance($user_id);
+        if ($balance < $credits_cost) {
+            AKSRT_Order::get_instance()->update_status($order_number, AKSRT_Order::STATUS_CANCELLED, [
+                'note' => __('余额不足，自动取消', 'aksrt'),
+            ]);
+            return $this->forum->error(sprintf(
+                __('余额不足，需要 %d 积分（约 ¥%s），当前余额 %d', 'aksrt'),
+                $credits_cost,
+                number_format($amount, 2, '.', ''),
+                $balance
+            ));
+        }
+
+        $deducted = AKSRT_Credits::deduct(
+            $user_id,
+            $credits_cost,
+            'forum_topic_pay',
+            [
+                'topic_id' => $topic_id,
+                'order' => $order_number,
+            ],
+            sprintf(__('购买帖子「%s」', 'aksrt'), get_the_title($topic_id))
+        );
+
+        if (is_wp_error($deducted) || $deducted === false) {
+            AKSRT_Order::get_instance()->update_status($order_number, AKSRT_Order::STATUS_CANCELLED, [
+                'note' => __('扣款失败，自动取消', 'aksrt'),
+            ]);
+            $msg = is_wp_error($deducted) ? $deducted->get_error_message() : __('扣款失败', 'aksrt');
+            return $this->forum->error($msg ?: __('扣款失败', 'aksrt'));
+        }
+
+        $paid = AKSRT_Order::get_instance()->update_status($order_number, AKSRT_Order::STATUS_PAID, [
+            'payment_method' => 'balance',
+            'payment_transaction_id' => 'BAL_' . $order_number,
+            'note' => sprintf(__('论坛付费主题余额支付 %d 积分', 'aksrt'), $credits_cost),
+        ]);
+
+        if (!$paid) {
+            // Best-effort refund so user is not charged without access.
+            AKSRT_Credits::add(
+                $user_id,
+                $credits_cost,
+                'forum_topic_pay_refund',
+                ['topic_id' => $topic_id, 'order' => $order_number],
+                sprintf(__('购买失败退款：%s', 'aksrt'), get_the_title($topic_id))
+            );
+            return $this->forum->error(__('订单确认失败，已尝试退回积分', 'aksrt'));
+        }
+
+        $this->mark_topic_unlocked($user_id, $topic_id);
+
+        return $this->forum->success(__('购买成功', 'aksrt'), [
+            'order_number' => $order_number,
+            'amount' => $amount,
+            'credits_cost' => $credits_cost,
+        ]);
+    }
+
+    /**
+     * Resolve cash price for a pay-visibility topic.
+     *
+     * @return array{amount:float,is_vip_price:bool,is_free:bool,label:string,base:float,vip_set:bool}
+     */
+    public function resolve_topic_pay_price(int $topic_id, int $user_id = 0): array {
+        $base_raw = get_post_meta($topic_id, '_aksrt_pay_price', true);
+        $base = is_numeric($base_raw) ? (float) $base_raw : 0.0;
+
+        $vip_raw = get_post_meta($topic_id, '_aksrt_pay_vip_price', true);
+        $vip_set = ($vip_raw !== '' && $vip_raw !== null && $vip_raw !== false);
+        $vip_price = $vip_set && is_numeric($vip_raw) ? (float) $vip_raw : 0.0;
+
+        $is_vip = $user_id > 0 && function_exists('aksrt_is_vip') && aksrt_is_vip($user_id);
+        if (!$is_vip && $user_id > 0 && function_exists('aksrt_is_vip_exempt') && aksrt_is_vip_exempt($user_id)) {
+            $is_vip = true;
+        }
+
+        if ($is_vip && $vip_set) {
+            return [
+                'amount' => max(0.0, $vip_price),
+                'is_vip_price' => true,
+                'is_free' => $vip_price <= 0,
+                'label' => $vip_price <= 0
+                    ? __('VIP 免费', 'aksrt')
+                    : sprintf(__('VIP ¥%s', 'aksrt'), number_format($vip_price, 2, '.', '')),
+                'base' => $base,
+                'vip_set' => true,
+            ];
+        }
+
+        return [
+            'amount' => max(0.0, $base),
+            'is_vip_price' => false,
+            'is_free' => false,
+            'label' => $base > 0
+                ? sprintf(__('¥%s', 'aksrt'), number_format($base, 2, '.', ''))
+                : __('价格未设置', 'aksrt'),
+            'base' => $base,
+            'vip_set' => $vip_set,
+        ];
+    }
+
+    public function mark_topic_unlocked(int $user_id, int $topic_id): void {
+        if ($user_id <= 0 || $topic_id <= 0) {
+            return;
+        }
+        $unlocked = get_user_meta($user_id, 'aksrt_unlocked_topics', true);
+        if (!is_array($unlocked)) {
+            $unlocked = [];
+        }
+        $unlocked[] = $topic_id;
+        update_user_meta($user_id, 'aksrt_unlocked_topics', array_values(array_unique(array_map('intval', $unlocked))));
+    }
+
     public function has_user_unlocked_topic(int $user_id, int $post_id): bool {
         $unlocked = get_user_meta($user_id, 'aksrt_unlocked_topics', true);
         if (!is_array($unlocked)) {
             return false;
         }
-        return in_array($post_id, $unlocked, true);
+        return in_array($post_id, array_map('intval', $unlocked), true);
+    }
+
+    /**
+     * Paid access for VISIBILITY_PAY: unlock list OR paid resource order OR VIP free.
+     */
+    public function has_user_paid_topic(int $user_id, int $topic_id): bool {
+        if ($user_id <= 0 || $topic_id <= 0) {
+            return false;
+        }
+
+        if ($this->has_user_unlocked_topic($user_id, $topic_id)) {
+            return true;
+        }
+
+        if (class_exists('AKSRT_Order')) {
+            $product_type = class_exists('AKSRT_Domain_Model')
+                ? AKSRT_Domain_Model::ORDER_PRODUCT_RESOURCE
+                : 'resource';
+            if (AKSRT_Order::get_instance()->has_paid_access($user_id, $product_type, $topic_id)) {
+                return true;
+            }
+        }
+
+        $price = $this->resolve_topic_pay_price($topic_id, $user_id);
+        if (!empty($price['is_free'])) {
+            return true;
+        }
+
+        return false;
     }
 
     public function has_user_commented_on(int $user_id, int $post_id): bool {
diff --git a/inc/classes/forum/topic-service-traits/trait-aksrt-forum-topic-service-part-4.php b/inc/classes/forum/topic-service-traits/trait-aksrt-forum-topic-service-part-4.php
index be4d2a9e..20e7e491 100644
--- a/inc/classes/forum/topic-service-traits/trait-aksrt-forum-topic-service-part-4.php
+++ b/inc/classes/forum/topic-service-traits/trait-aksrt-forum-topic-service-part-4.php
@@ -263,4 +263,25 @@ trait AKSRT_Forum_Topic_Service_Part_4 {
             wp_send_json_error(['message' => $result['message'] ?? __('解锁失败', 'aksrt')]);
         }
     }
+
+    public function ajax_purchase_topic(): void {
+        check_ajax_referer('aksrt_forum_action', '_nonce');
+
+        $user_id = get_current_user_id();
+        if ($user_id <= 0) {
+            wp_send_json_error(['message' => __('请先登录', 'aksrt')]);
+        }
+
+        $topic_id = (int) ($_POST['topic_id'] ?? 0);
+        if ($topic_id <= 0) {
+            wp_send_json_error(['message' => __('主题不存在', 'aksrt')]);
+        }
+
+        $result = $this->purchase_topic_with_balance($user_id, $topic_id);
+        if (!empty($result['success'])) {
+            wp_send_json_success($result);
+        } else {
+            wp_send_json_error(['message' => $result['message'] ?? __('购买失败', 'aksrt')]);
+        }
+    }
 }
diff --git a/templates/forum/forum-topic.php b/templates/forum/forum-topic.php
index 363a1595..c3fa4be6 100644
--- a/templates/forum/forum-topic.php
+++ b/templates/forum/forum-topic.php
@@ -89,9 +89,58 @@ if (empty($topic['can_view'])) :
                         <a href="<?php echo esc_url(wp_login_url(get_permalink($topic_id))); ?>" class="aksrt-forum-topic__primary-btn"><?php esc_html_e('登录后解锁', 'aksrt'); ?></a>
                     <?php endif; ?>
                 <?php elseif ($deny_vis === 'pay') : ?>
+                    <?php
+                    $viewer_id = get_current_user_id();
+                    $vip_price_raw = get_post_meta($topic_id, '_aksrt_pay_vip_price', true);
+                    $vip_set = ($vip_price_raw !== '' && $vip_price_raw !== null && $vip_price_raw !== false);
+                    $is_vip_user = $viewer_id > 0 && function_exists('aksrt_is_vip') && aksrt_is_vip($viewer_id);
+                    if (!$is_vip_user && $viewer_id > 0 && function_exists('aksrt_is_vip_exempt') && aksrt_is_vip_exempt($viewer_id)) {
+                        $is_vip_user = true;
+                    }
+                    $charge_amount = (float) $pay_price;
+                    $is_free_vip = false;
+                    if ($is_vip_user && $vip_set) {
+                        $charge_amount = max(0.0, (float) $vip_price_raw);
+                        $is_free_vip = $charge_amount <= 0;
+                    }
+                    ?>
                     <p><?php esc_html_e('该主题为付费内容，请购买后查看。', 'aksrt'); ?></p>
-                    <?php if (!empty($pay_price)) : ?>
-                        <span class="aksrt-forum-topic__pay-price"><?php printf(esc_html__('价格：¥%s', 'aksrt'), esc_html((string) $pay_price)); ?></span>
+                    <?php if ($is_vip_user && $vip_set) : ?>
+                        <span class="aksrt-forum-topic__pay-price">
+                            <?php
+                            if ($is_free_vip) {
+                                esc_html_e('VIP 免费', 'aksrt');
+                            } else {
+                                printf(
+                                    esc_html__('VIP 价：¥%s', 'aksrt'),
+                                    esc_html(number_format($charge_amount, 2, '.', ''))
+                                );
+                                if (!empty($pay_price) && (float) $pay_price > $charge_amount) {
+                                    echo ' <del>' . esc_html(sprintf(__('原价 ¥%s', 'aksrt'), number_format((float) $pay_price, 2, '.', ''))) . '</del>';
+                                }
+                            }
+                            ?>
+                        </span>
+                    <?php elseif (!empty($pay_price)) : ?>
+                        <span class="aksrt-forum-topic__pay-price"><?php printf(esc_html__('价格：¥%s', 'aksrt'), esc_html(number_format((float) $pay_price, 2, '.', ''))); ?></span>
+                    <?php endif; ?>
+                    <?php if (!is_user_logged_in()) : ?>
+                        <a href="<?php echo esc_url(wp_login_url(get_permalink($topic_id))); ?>" class="aksrt-forum-topic__primary-btn"><?php esc_html_e('登录后购买', 'aksrt'); ?></a>
+                    <?php else : ?>
+                        <button type="button" class="aksrt-forum-topic__primary-btn js-aksrt-purchase-topic"
+                            data-topic-id="<?php echo esc_attr((string) $topic_id); ?>"
+                            data-price="<?php echo esc_attr(number_format($charge_amount, 2, '.', '')); ?>"
+                            data-free="<?php echo $is_free_vip ? '1' : '0'; ?>">
+                            <i class="fas fa-shopping-cart"></i>
+                            <?php
+                            if ($is_free_vip) {
+                                esc_html_e('VIP 免费解锁', 'aksrt');
+                            } else {
+                                printf(esc_html__('余额支付 ¥%s', 'aksrt'), esc_html(number_format($charge_amount, 2, '.', '')));
+                            }
+                            ?>
+                        </button>
+                        <span class="aksrt-forum-topic__unlock-feedback js-aksrt-action-feedback" aria-live="polite"></span>
                     <?php endif; ?>
                 <?php else : ?>
                     <p><?php esc_html_e('该主题当前处于受限可见或审核状态。', 'aksrt'); ?></p>