fix: NEW修复预览与保存不一致，添加3:4比例，输入框透明无边框

css/style.css

@@ -0,0 +1,198 @@
+* {
+    margin: 0;
+    padding: 0;
+    box-sizing: border-box;
+}
+
+html, body {
+    height: 100%;
+    font-family: -apple-system, BlinkMacSystemFont, 'Segoe UI', 'PingFang SC', 'Hiragino Sans GB', 'Microsoft YaHei', sans-serif;
+    background: #f5f5f5;
+    overflow: hidden;
+    -webkit-user-select: none;
+    user-select: none;
+}
+
+.app {
+    display: flex;
+    flex-direction: column;
+    height: 100vh;
+}
+
+/* 顶部工具栏 */
+.toolbar {
+    display: flex;
+    justify-content: center;
+    gap: 16px;
+    padding: 12px 16px;
+    background: #fff;
+    border-bottom: 1px solid #e0e0e0;
+    flex-shrink: 0;
+}
+
+.btn {
+    padding: 10px 24px;
+    font-size: 15px;
+    border: 1px solid #ddd;
+    border-radius: 6px;
+    background: #fff;
+    color: #333;
+    cursor: pointer;
+    transition: all 0.2s;
+}
+
+.btn:active {
+    background: #f0f0f0;
+}
+
+.btn-primary {
+    background: #4a90e2;
+    color: #fff;
+    border-color: #4a90e2;
+}
+
+.btn-primary:active {
+    background: #3a7bc8;
+}
+
+/* 图片展示区 */
+.canvas-area {
+    flex: 1;
+    display: flex;
+    align-items: center;
+    justify-content: center;
+    padding: 16px;
+    overflow: auto;
+    position: relative;
+}
+
+.empty-tip {
+    color: #999;
+    font-size: 14px;
+}
+
+/* 预览区域固定 3:5 比例，打开即显示空白面板 */
+.image-container {
+    display: flex;
+    position: relative;
+    width: 100%;
+    max-width: 360px;
+    aspect-ratio: 3 / 5;
+    box-shadow: 0 4px 20px rgba(0,0,0,0.15);
+    background: #fff;
+    overflow: hidden;
+}
+
+.image-container.empty {
+    background: #f0f0f0;
+    border: 2px dashed #ddd;
+}
+
+/* 背景图自适应铺满容器，超出部分裁剪 */
+#bgImage {
+    display: block;
+    width: 100%;
+    height: 100%;
+    object-fit: cover;
+    object-position: center;
+    -webkit-user-drag: none;
+}
+
+#bgImage[src=""] {
+    display: none;
+}
+
+/* 文字输入框 - 透明无边框设计 */
+.text-input {
+    position: absolute;
+    min-width: 80px;
+    min-height: 32px;
+    padding: 4px 8px;
+    font-size: 18px;
+    color: #333;
+    background: transparent;
+    border: 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;
+}
+
+/* 选中状态（单击/长按） - 仅显示虚线边框 */
+.text-input.selected {
+    border: 2px dashed rgba(74, 144, 226, 0.6);
+    cursor: grab;
+}
+
+/* 编辑状态（双击） - 显示实线边框 */
+.text-input.editing {
+    border: 2px solid #4a90e2;
+    background: rgba(255,255,255,0.1);
+    cursor: text;
+    -webkit-user-select: text;
+    user-select: text;
+}
+
+/* 拖拽状态 */
+.text-input.dragging {
+    opacity: 0.8;
+    cursor: grabbing;
+}
+
+/* 隐藏空提示 */
+.empty-tip.hidden {
+    display: none;
+}
+
+/* 长按提示 */
+.long-press-tip {
+    position: fixed;
+    bottom: 20px;
+    left: 50%;
+    transform: translateX(-50%);
+    padding: 8px 16px;
+    background: rgba(0,0,0,0.7);
+    color: #fff;
+    font-size: 12px;
+    border-radius: 16px;
+    opacity: 0;
+    transition: opacity 0.3s;
+    pointer-events: none;
+    z-index: 1000;
+}
+
+.long-press-tip.show {
+    opacity: 1;
+}
+
+/* 右键菜单 */
+.context-menu {
+    position: fixed;
+    background: #fff;
+    border: 1px solid #ddd;
+    border-radius: 6px;
+    box-shadow: 0 4px 12px rgba(0,0,0,0.15);
+    padding: 4px 0;
+    z-index: 1000;
+    min-width: 140px;
+}
+
+.context-menu-item {
+    padding: 10px 16px;
+    font-size: 14px;
+    color: #333;
+    cursor: pointer;
+    transition: background 0.2s;
+}
+
+.context-menu-item:hover {
+    background: #f5f5f5;
+}
+
+.context-menu-item:active {
+    background: #e8e8e8;
+}