fix(order-create): 修复暖色主题下购买时长加减按钮白字浅底不可读

- step-btn 改为品牌色浅底/浅色文字，暖色主题改为浅橙底/深橙字

- 补充按压、禁用态与去除按钮默认边框

- HBuilderX 编译成功；120 套件/785 用例全绿

pwuniapp/pages/order/create.vue

@@ -868,17 +868,26 @@ const handlePay = async () => {
         height: 72rpx;
         line-height: 68rpx;
         padding: 0;
-        background: var(--bg-surface-elevated);
-        color: #FFF;
-        font-size: 32rpx;
+        background: rgba(99, 102, 241, 0.16);
+        color: #C7D2FE;
+        font-size: 34rpx;
+        font-weight: 700;
         border-radius: 14rpx;
-        border: none;
+        border: 1rpx solid rgba(129, 140, 248, 0.28);
         margin: 0;
         transition: transform 0.1s ease;
 
+        &::after {
+          border: none;
+        }
+
         &:active {
           transform: scale(0.92);
         }
+
+        &[disabled] {
+          opacity: 0.4;
+        }
       }
 
       .step-val {
@@ -1585,4 +1594,11 @@ const handlePay = async () => {
     box-shadow: 0 -12rpx 30rpx rgba(28, 25, 23, 0.07);
   }
 }
+.create-order-container.theme-warm {
+  .stepper-box .step-btn {
+    background: #FFF7ED;
+    color: #C2410C;
+    border-color: #FED7AA;
+  }
+}
 </style>