body {
  margin: 0 auto;
  padding: 0;
  font-family: Microsoft YaHei;
  background-color: #f5f5f5;
  font-size: 100%;
}
@media all and (min-width: 640px) {
  body {
    width: 640px;
    margin: 0 auto;
  }
}
html,
h1,
h2,
h3,
h4,
h5,
dl,
dd,
dt,
ul,
li,
ol,
span,
p {
  margin: 0;
  padding: 0;
}
select {
  border: 0 none;
}
a {
  text-decoration: none;
}
input,
textarea,
select {
  outline: none;
  border: 0 none;
  padding: 0;
  margin: 0;
}
ul,
li {
  list-style: none;
}
button {
  outline: none;
}
.left {
  float: left;
}
.right {
  float: right;
}
.header {
  width: 100%;
  overflow: hidden;
  background-color: #fff;
}
.header .logo {
  width: 62.5%;
  font-size: 0;
  float: left;
}
.header .logo img {
  width: 100%;
}
.header .phone {
  float: right;
  margin: 1.21875rem 0.875rem 0 0;
}
.header .phone img {
  width: 1.21875rem;
  height: 1.21875rem;
  vertical-align: top;
}
.header .eng {
  float: right;
  margin: 1.125rem 0.625rem 0 0;
}
.header .eng a {
  color: #282828;
  font-size: 0.84375rem;
  font-family: "Arial";
}
.nav {
  width: 100%;
  background-color: #1a1d24;
  text-align: center;
  font-size: 0;
}
.nav ul {
  display: inline-block;
  overflow: hidden;
  font-size: 0;
}
.nav ul li {
  width: 25%;
  float: left;
  border-bottom: 0.03125rem solid #31343a;
  border-right: 0.03125rem solid #31343a;
  box-sizing: border-box;
}
.nav ul li a {
  display: block;
  color: #fff;
  font-size: 0.75rem;
  line-height: 200%;
}
.nav ul .last {
  border-right: 0 none;
}
.sanbtn {
  width: 100%;
  height: 2.25rem;
  line-height: 2.25rem;
  text-align: center;
  border-top: 0.0625rem solid #e6e6e6;
}
.sanbtn ul li {
  width: 33.33333333%;
  background: url(/web_images/h5/sanbtn1.jpg) repeat-x;
  -webkit-background-size: 100% 2.25rem;
  background-size: 100% 2.25rem;
  float: left;
}
.sanbtn ul li a {
  display: block;
  color: #fff;
  font-size: 0.6875rem;
}
.sanbtn ul li img {
  width: 1.71875rem;
  height: 2.25rem;
  vertical-align: top;
}
.sanbtn ul .on {
  background: url(/web_images/h5/sanbtn2.jpg) repeat-x;
  -webkit-background-size: 100% 2.25rem;
  background-size: 100% 2.25rem;
}