简化解决方案幻灯片为单卡片淡入淡出效果

- 移除复杂的堆叠和多列动画效果
- 改为简单的单卡片展示模式
- 使用 0.6s 的 opacity 淡入淡出过渡
- 保留 3 秒自动播放和按钮切换功能
- 保留鼠标悬停暂停、离开恢复播放功能
- 简化 CSS 代码，提升可维护性
- 简化 JavaScript 逻辑，移除复杂的动画状态管理

🤖 Generated with [Claude Code](https://claude.com/claude-code)

Co-Authored-By: Claude <noreply@anthropic.com>

css/index.css

@@ -2696,142 +2696,31 @@ html {
   display: none;
 }
 
-/* 下层：幻灯片容器 - 左中右三栏布局 */
+/* 下层：幻灯片容器 */
 .solution-slider {
   position: relative;
   min-height: 450px;
-  perspective: 1500px;
-  overflow: visible;
+  overflow: hidden;
 }
 
-/* 单个幻灯片 - 默认隐藏 */
+/* 单个幻灯片 */
 .solution-slide {
   position: absolute;
   top: 0;
-  left: 50%;
+  left: 0;
   width: 100%;
   opacity: 0;
-  transform: translateX(-50%) scale(0.7);
-  transition: all 0.6s cubic-bezier(0.4, 0, 0.2, 1);
+  transition: opacity 0.6s ease;
   pointer-events: none;
   z-index: 1;
 }
 
-/* 中间激活的主卡片 */
+/* 激活的幻灯片 */
 .solution-slide.active {
   position: relative;
-  left: 0;
   opacity: 1;
-  transform: translateX(0) scale(1);
   pointer-events: auto;
-  z-index: 10;
-}
-
-/* 左侧卡片 - 上一张的预览 */
-.solution-slide.prev {
-  position: absolute;
-  left: 0;
-  opacity: 0.5;
-  transform: translateX(-55%) scale(0.85);
-  pointer-events: none;
-  z-index: 5;
-  filter: brightness(0.7);
-}
-
-/* 右侧卡片 - 下一张的预览 */
-.solution-slide.next {
-  position: absolute;
-  left: auto;
-  right: 0;
-  opacity: 0.5;
-  transform: translateX(55%) scale(0.85);
-  pointer-events: none;
-  z-index: 5;
-  filter: brightness(0.7);
-}
-
-/* 切换动画 - 从右到中 */
-.solution-slide.slide-to-center {
-  animation: slideFromRightToCenter 0.6s cubic-bezier(0.4, 0, 0.2, 1) forwards;
-  z-index: 11;
-}
-
-@keyframes slideFromRightToCenter {
-  from {
-    left: auto;
-    right: 0;
-    opacity: 0.5;
-    transform: translateX(55%) scale(0.85);
-    filter: brightness(0.7);
-  }
-  to {
-    left: 0;
-    right: auto;
-    opacity: 1;
-    transform: translateX(0) scale(1);
-    filter: brightness(1);
-  }
-}
-
-/* 切换动画 - 从中到左 */
-.solution-slide.slide-to-left {
-  animation: slideFromCenterToLeft 0.6s cubic-bezier(0.4, 0, 0.2, 1) forwards;
-  z-index: 9;
-}
-
-@keyframes slideFromCenterToLeft {
-  from {
-    left: 0;
-    opacity: 1;
-    transform: translateX(0) scale(1);
-    filter: brightness(1);
-  }
-  to {
-    left: 0;
-    opacity: 0.5;
-    transform: translateX(-55%) scale(0.85);
-    filter: brightness(0.7);
-  }
-}
-
-/* 切换动画 - 从左消失 */
-.solution-slide.slide-out-left {
-  animation: slideOutToLeft 0.6s cubic-bezier(0.4, 0, 0.2, 1) forwards;
-  z-index: 3;
-}
-
-@keyframes slideOutToLeft {
-  from {
-    left: 0;
-    opacity: 0.5;
-    transform: translateX(-55%) scale(0.85);
-  }
-  to {
-    left: 0;
-    opacity: 0;
-    transform: translateX(-80%) scale(0.7);
-  }
-}
-
-/* 切换动画 - 从右侧外进入到右侧位置 */
-.solution-slide.slide-in-right {
-  animation: slideInFromRight 0.6s cubic-bezier(0.4, 0, 0.2, 1) forwards;
-  z-index: 4;
-}
-
-@keyframes slideInFromRight {
-  from {
-    left: auto;
-    right: 0;
-    opacity: 0;
-    transform: translateX(80%) scale(0.7);
-  }
-  to {
-    left: auto;
-    right: 0;
-    opacity: 0.5;
-    transform: translateX(55%) scale(0.85);
-  }
+  z-index: 2;
 }
 
 /* 幻灯片内容区域 */