fix：校准画布编辑与图片导出文字水平垂直位置偏移问题，修改屏幕尺寸为960x1361像素

css/style.css

@@ -261,7 +261,7 @@ html, body {
     position: relative;
     width: 100%;
     max-width: 360px;
-    aspect-ratio: 3 / 5;
+    aspect-ratio: 960 / 1361;
     box-shadow: 0 4px 20px rgba(0,0,0,0.15);
     background: #fff;
     overflow: hidden;
@@ -372,36 +372,34 @@ html, body {
     position: absolute;
     min-width: 80px;
     min-height: 32px;
-    padding: 4px 8px;
+    padding: 0;
     font-size: 16px;
     color: #000;
     font-family: "Microsoft YaHei", "微软雅黑", sans-serif;
     background: transparent;
-    border: 2px solid transparent;
+    outline: 2px solid transparent;
     border-radius: 4px;
-    outline: none;
     cursor: grab;
     white-space: nowrap;
     line-height: 1.4;
     -webkit-user-select: none;
     user-select: none;
-    transition: border-color 0.2s;
+    transition: outline-color 0.2s;
     z-index: 10;
-    /* 确保输入框内容超出时不影响父容器和其他元素 */
     overflow: visible;
     max-width: none;
     box-sizing: border-box;
 }
 
-/* 选中状态（单击/长按） - 仅显示虚线边框 */
+/* 选中状态（单击/长按） - 仅显示虚线轮廓 */
 .text-input.selected {
-    border: 2px dashed rgba(74, 144, 226, 0.6);
+    outline: 2px dashed rgba(74, 144, 226, 0.6);
     cursor: grab;
 }
 
-/* 编辑状态（双击） - 显示实线边框 */
+/* 编辑状态（双击） - 显示实线轮廓 */
 .text-input.editing {
-    border: 2px solid #4a90e2;
+    outline: 2px solid #4a90e2;
     background: rgba(255,255,255,0.1);
     cursor: text;
     -webkit-user-select: text;