body {
  font-size: 16px;
  font-family: "Microsoft YaHei", "Avenir", Helvetica, Arial, sans-serif;
  background-color: #ffffff;
  color: #333;
  min-width: 1200px;
}

div,
footer,
header,
p,
a,
footer,
dl,
dt,
dt,
ul,
li {
  box-sizing: border-box;
}

p,
dl,
dd,
ul {
  margin: 0;
}

ul {
  padding: 0;
  list-style: none;
}

a {
  color: #333;
  display: block;
  text-decoration: none;
}

img {
  display: block;
  border: none;
}

input,
button,
textarea {
  padding: 0;
  border: none;
  background-color: transparent;
}

/* 设置框中的提示文本居中 IOS */
input,
textarea {
  line-height: normal;
  outline: none;
}

textarea {
  resize: none;
}


/* flex布局 API:https://www.runoob.com/w3cnote/flex-grammar.html */
/* 垂直方向居中 */
.flex-v {
  display: flex;
  align-items: center;
}

/* 水平方向居中 */
.flex-l {
  display: flex;
  justify-content: center;
}

/* 垂直水平方向居中 */
.flex-c {
  display: flex;
  align-items: center;
  justify-content: center;
}
/* 换行显示 */
.flex-wrap {
  display: flex;
  flex-wrap: wrap;
}

/* flex 布局 */
.flex {
  display: flex;
}
/* flex-direction 属性决定主轴的方向（即项目的排列方向） */
/* 主轴为垂直方向，起点在上沿 */
.column {
  flex-direction: column;
}
/* 水平-相反 */
.row-reverse {
  flex-direction: row-reverse;
}
/* 垂直-相反 */
.column-reverse {
  flex-direction: column-reverse;
}
/* justify-content属性定义了项目在主轴上的对齐方式。 */
/* 两端对齐，项目之间的间隔都相等 */
.between {
  justify-content: space-between;
}
/* 每个项目两侧的间隔相等。所以，项目之间的间隔比项目与边框的间隔大一倍 */
.around {
  justify-content: space-around;
}
/* 水平右对齐 */
.l-end {
  justify-content: flex-end;
}
/* align-items属性定义项目在交叉轴上如何对齐。 */

/* flex 占满剩余空间 */
.flex-item {
  flex: 1;
}

/* 文本通用样式 */
.single-txt {
  white-space: nowrap;
  overflow: hidden;
  text-overflow: ellipsis;
}

.multiline-txt {
  display: -webkit-box;
  overflow: hidden;
  text-overflow: ellipsis;
  -webkit-line-clamp: 2;
  -webkit-box-orient: vertical;
  word-break: break-word;
}

.tc {
  text-align: center;
}

.tr {
  text-align: right;
}

.ovh {
  overflow: hidden;
}

.bg {
  background-repeat: no-repeat;
  background-size: cover;
  background-position: center;
}
/* 图片高度100% */
.pich {
  height: 100%;
}
img.cover {
  object-fit: cover;
}

/* end 文本通用样式 */

/* 项目公共样式 */
#app {
  min-width: 1200px;
}

.container {
  width: 1200px;
  margin: 0 auto;
}

.lh {
  line-height: 30px;
}

.gray-bg {
  background-color: #f7f7f7;
}

.cs-title1 {
  font-weight: bold;
}
.cs-title1.white {
  color: #fff;
}
.cs-title1.black {
  color: #000;
}
.cs-title1 .en {
  font-size: 30px;
  padding-bottom: 26px;
}
.cs-title1 .zh {
  font-size: 20px;
}

.banner-img {
  width: 100%;
  height: 600px;
}

/* header */
.header {
  height: 130px;
  width: 100%;
  min-width: 1200px;
  position: fixed;
  top: 0;
  left: 0;
  z-index: 1000;
  transition: background-color 0.5s;
}
.header.active {
  background-color: rgba(0, 0, 0, 0.5);
}
.header .logo-img {
  width: 100px;
}
.header .nav {
  font-size: 18px;
}
.header .nav-item {
  color: #fff;
  padding: 0 20px;
  line-height: 45px;
  border-bottom: 1px solid transparent;
  transition: border-color 0.5s;
}
.header .nav-item:hover,
.header .nav-item.active {
  border-color: #fff;
}
.header .outer-chain {
  height: 45px;
  line-height: 45px;
  text-align: center;
  padding: 0 20px;
  border-radius: 10px;
  background-color: #fff;
  color: #0d0d0d;
  margin-left: 20px;
}

/* footer */
.footer {
  height: 960px;
  padding-top: 195px;
  /*background-image: url(../img/footer.jpg);*/
  color: #fff;
}
.footer .title-en {
  font-size: 30px;
  font-weight: bold;
}
.footer .qr-code {
  width: 148px;
  height: 148px;
}
.footer .cs-title1 .zh {
  padding-bottom: 46px;
}
.footer .tags span {
  margin-right: 50px;
}
.footer .copyright {
  height: 120px;
  line-height: 120px;
  border-top: 1px solid #d9dddc;
  text-align: center;
}
.footer .brief {
  padding-top: 134px;
  height: 497px;
  line-height: 30px;
}
.footer .brief dt {
  padding-bottom: 34px;
}