* {
  margin: 0;
  padding: 0;
}
html, body {
  height: 100%;
}
img {
  border: none;
}
input,
select,
textarea {
  outline: none;
  border: none;
  background: none;
}
textarea {
  resize: none;
}
a {
  text-decoration: none;
  color: #444;
}
a:hover {
  text-decoration: none;
}
body {
  font-size: 14px;
  font-family: "Microsoft YaHei", "微软雅黑";
  background: #000000;
  color: #444;
}
ul,
ol {
  margin-bottom: 0;
  list-style: none;
}
h1,
h2,
h3,
h4 {
  margin-bottom: 0;
  margin-top: 0;
}
p {
  margin: 0 0 ;
}
.header-wrap {
  width: 100%;
  height: 50px;
  background: #000000;
  box-shadow: 0px 2px 2px #233946;
  overflow: hidden;
}
.header {
  width: 1020px;
  height: 50px;
  margin: 0 auto;
  vertical-align: middle;
}
.header .h-logo {
  width: auto;
  line-height: 50px;
  float: left;
}
.header .h-logo a {
  color: #ffffff;
  font-size: 20px;
  letter-spacing: 2px;
}
.header .nav {
  float: right;
  color: #fff;
  padding-top: 10px;
}
.header .nav li {
  float: left;
  margin: 0 20px;
}
.header .nav a {
  color: #fff;
  padding: 5px 20px;
  display: block;
}
.header .nav a:hover {
  background: #ffffff;
  border-radius: 5px;
  color: #464646;
}
.header .nav .cur {
  background: #ffffff;
  border-radius: 5px;
  color: #464646;
}
.main-box {
  width: 1920px;
  height: 820px;
  margin: 0 auto;
  background: url("../images/lark_1.png") 0 0 no-repeat;
  position: relative;
  overflow: hidden;
  background-position: center center;
}
.main-box2 {
  width: 1920px;
  height: 820px;
  margin: 0 auto;
  background: url("../images/lark_2.png") 0 0 no-repeat;
  position: relative;
  overflow: hidden;
  background-position: center center;
}
.main-box3 {
  width: 1920px;
  height: 820px;
  margin: 0 auto;
  background: url("../images/lark_3.png") 0 0 no-repeat;
  position: relative;
  overflow: hidden;
  background-position: center center;
}
.image-container img {
  width: 100%; /* 宽度铺满父容器 */
  height: auto; /* 高度等比缩放 */
  display: block; /* 移除图片底部空隙 */
}
.main-box4 {
  background-image: url("../images/lark_4.png"); /* 替换为你的图片路径 */
  background-size: contain; /* 等比例缩放完整显示 */
/*  background-size: cover; !* 等比例缩放完整显示 *!*/
  background-position: top; /* 居中显示 */
  background-repeat: no-repeat;
  /* 计算比例，假设图片比例是 16:9 */
  width: 100%;
  padding-top: 56.25%; /* 9 / 16 = 0.5625 -> 56.25% */
  /* 让高度由 padding 决定 */
  position: relative;
}
.footer-wrap {
  width: 100%;
  height: 100px;
  background: #000000;
  color: #fff;
  padding-top: 16px;
  overflow: hidden;
}
.footer-wrap .footer {
  width: 1020px;
  height: 100px;
  margin: 0 auto;
  text-align: center;
  line-height: 30px;
}