feat: 消息ui优化

Yi.Ai.Vue3/src/pages/chat/styles/mixins.scss

@@ -0,0 +1,102 @@
+// 聊天页面公共 mixins
+
+// 响应式
+@mixin respond-to($breakpoint) {
+  @if $breakpoint == tablet {
+    @media (max-width: 768px) {
+      @content;
+    }
+  } @else if $breakpoint == mobile {
+    @media (max-width: 480px) {
+      @content;
+    }
+  }
+}
+
+// 弹性布局
+@mixin flex-center {
+  display: flex;
+  align-items: center;
+  justify-content: center;
+}
+
+@mixin flex-between {
+  display: flex;
+  align-items: center;
+  justify-content: space-between;
+}
+
+@mixin flex-column {
+  display: flex;
+  flex-direction: column;
+}
+
+// 文本省略
+@mixin text-ellipsis {
+  overflow: hidden;
+  text-overflow: ellipsis;
+  white-space: nowrap;
+}
+
+// 多行文本省略
+@mixin text-ellipsis-multi($lines: 2) {
+  display: -webkit-box;
+  -webkit-line-clamp: $lines;
+  -webkit-box-orient: vertical;
+  overflow: hidden;
+}
+
+// 滚动按钮样式
+@mixin scroll-btn {
+  position: absolute;
+  top: 50%;
+  transform: translateY(-50%);
+  @include flex-center;
+  width: 22px;
+  height: 22px;
+  border-radius: 8px;
+  border: 1px solid rgba(0, 0, 0, 0.08);
+  color: rgba(0, 0, 0, 0.4);
+  background-color: #fff;
+  font-size: 10px;
+  cursor: pointer;
+  z-index: 10;
+  transition: all 0.2s ease;
+
+  &:hover {
+    background-color: #f3f4f6;
+    border-color: rgba(0, 0, 0, 0.15);
+    color: rgba(0, 0, 0, 0.6);
+  }
+}
+
+// 操作按钮样式
+@mixin action-btn {
+  width: 24px;
+  height: 24px;
+  padding: 0;
+  font-size: 13px;
+  color: #555;
+  background: transparent;
+  border: none;
+  border-radius: 4px;
+  transition: all 0.2s ease;
+
+  &:hover {
+    color: #409eff;
+    background: #f0f7ff;
+  }
+
+  &:active {
+    background: #e6f2ff;
+  }
+
+  &[disabled] {
+    color: #bbb;
+    background: transparent;
+  }
+
+  .el-icon {
+    font-size: 13px;
+  }
+}