refactor: 样式文件结构优化，新增重置样式

Former-commit-id: 244309f3ab8375f83df2d69b1b474cab23045b22

src/styles/reset.scss

@@ -0,0 +1,90 @@
+*,
+::before,
+::after {
+  box-sizing: border-box;
+  border-width: 0;
+  border-style: solid;
+  border-color: currentColor;
+}
+
+#app {
+  width: 100%;
+  height: 100%;
+}
+
+html {
+  line-height: 1.5;
+  -webkit-text-size-adjust: 100%;
+  -moz-tab-size: 4;
+  tab-size: 4;
+  width: 100%;
+  height: 100%;
+  box-sizing: border-box;
+}
+
+body {
+  margin: 0;
+  line-height: inherit;
+  width: 100%;
+  height: 100%;
+  -moz-osx-font-smoothing: grayscale;
+  -webkit-font-smoothing: antialiased;
+  text-rendering: optimizelegibility;
+  font-family: "Helvetica Neue", Helvetica, "PingFang SC", "Hiragino Sans GB",
+    "Microsoft YaHei", "微软雅黑", Arial, sans-serif;
+}
+
+
+a {
+  color: inherit;
+  text-decoration: inherit;
+}
+
+
+img,
+svg
+ {
+  display: inline-block;
+}
+svg {
+  vertical-align: -0.15em; //因icon大小被设置为和字体大小一致，而span等标签的下边缘会和字体的基线对齐，故需设置一个往下的偏移比例，来纠正视觉上的未对齐效果
+}
+
+
+
+
+
+*,
+*::before,
+*::after {
+  box-sizing: inherit;
+}
+
+a:focus,
+a:active {
+  outline: none;
+}
+
+a,
+a:focus,
+a:hover {
+  cursor: pointer;
+  color: inherit;
+  text-decoration: none;
+}
+
+div:focus {
+  outline: none;
+}
+
+.clearfix {
+  &::after {
+    visibility: hidden;
+    display: block;
+    font-size: 0;
+    content: " ";
+    clear: both;
+    height: 0;
+  }
+}
+