html {
  margin: 0;
  height: 100%;
}
body {
  margin: 0;
  height: 100%;
  font-size: 18px;
  font-family: "微软雅黑";
  background: url(image/banner.jpg) center top no-repeat;
  background-size: auto 600px;
}
header {
  position: fixed;
  top: 0;
  left: 0;
  right: 0;
  background-color: #def6ff;
  padding: 15px 80px;
  display: flex;
  justify-content: space-between;
  line-height: 34px;
}
header div {
  margin: 0 auto;
  width: 1500px;
}
header h2 {
  margin: 0;
  padding: 0;
  letter-spacing: 4px;
  font-size: 28px;
  color: #00783d;
}
header menu {
  margin: 0;
  padding: 0 0 0 200px;
  list-style-type: none;
  display: flex;
  font-size: 20px;
  gap: 30px;
}
header menu a {
  color: #00783d;
  text-decoration: none;
}
header menu a:hover {
  color: orangered;
}
header nav {
  display: flex;
  gap: 20px;
}
header nav a {
  background-color: #00783d;
  font-size: 16px;
  color: white;
  padding: 7px 20px;
  line-height: 20px;
  border-radius: 17px;
  text-decoration: none;
}
header nav a:last-child {
  background-color: #ff5e00;
}
header nav a:hover {
  background-color: blue;
}

main {
  margin: 0 auto;
  padding-top: 250px;
}
main h3 {
  line-height: 60px;
  text-align: center;
  font-size: 60px;
  color: white;
  font-weight: normal;
  margin: 0 auto;
  /* max-width: 1400px; */
}
main h4 {
  line-height: 150px;
  text-align: center;
  font-size: 40px;
  color: white;
  font-weight: normal;
  height: 80px;
  text-align: right;
  margin: 0 auto;
  max-width: 74%;
}
main h5 {
  line-height: 260px;
  text-align: center;
  font-size: 30px;
  color: white;
  font-weight: normal;
  height: 80px;
  text-align: center;
  margin: 0 auto;
  max-width: 1400px;
}
main ol {
  list-style-type: none;
  margin: 0;
  padding: 0;
  padding-top: 160px;
}
main ol li {
  padding: 60px;
  margin: 0 auto;
}
main ol li:first-child {
  display: flex;
  justify-content: space-between;
  width: 80%;
  padding-bottom: 0;
}
main ol li:first-child button {
  width: 48%;
  border: none;
  padding: 15px;
  font-size: 24px;
  background-color: #00783d;
  color: white;
  border-radius: 20px;
  cursor: pointer;
}
main ol li:first-child button:last-child {
  background-color: #eee;
  color: black;
}
main ol li:first-child button:hover {
  background-color: #ff5e00;
}
main ol li:nth-child(2) {
  font-size: 30px;
  line-height: 50px;
  width: 80%;
}
main ol li:nth-child(3) {
  display: flex;
  background-color: #efefef;
}
main ol li:nth-child(3) p {
  display: block;
  line-height: 50px;
  width: 30%;
  font-size: 26px;
  padding-top: 30px;
}
main ol li:nth-child(3) dl {
  width: calc(35% - 1px);
  border-left: 1px solid #ccc;
  padding: 0 30px;
  margin: 0;
  background: url(image/dd.svg) 25px 0 no-repeat;
  background-size: 70px;
}
main ol li:nth-child(3) dl dt {
  line-height: 90px;
  font-weight: bold;
  font-size: 22px;
  padding-left: 100px;
}
main ol li:nth-child(3) dl dd {
  line-height: 30px;
  padding: 0;
  margin: 0;
}
main ol li:nth-child(4) {
  text-align: center;
  font-size: 40px;
  color: #00783d;
}
main ol li:nth-child(5) {
  display: flex;
  justify-content: space-around;
  padding-top: 0;
}
main ol li:nth-child(5) dl {
  width: 14.28%;
  text-align: center;
  font-size: 20px;
}
main ol li:nth-child(5) dl dt {
  line-height: 50px;
}
main ol li:nth-child(5) dl dt b {
  font-size: 40px;
}
main ol li:nth-child(5) dl dd {
  margin: 0;
}
main ol li:nth-child(6) {
  background: url(image/u67_div.jpg) right center no-repeat #efefef;
  background-size: 40vmax auto;
  padding: 80px 45vmax 80px 5vmax;
  line-height: 40px;
  font-size: 30px;
}

main ol li:nth-child(7) {
  display: flex;
  justify-content: space-around;
}
main ol li:nth-child(7) dl {
  width: 30%;
  border-left: 1px solid #ccc;
  padding: 0 50px;
}
main ol li:nth-child(7) dl:first-child {
  border: none;
}
main ol li:nth-child(7) dl dt {
  font-size: 40px;
  color: #00783d;
  line-height: 80px;
}
main ol li:nth-child(7) dl dd {
  margin: 0;
}

main ol li:nth-child(8) {
  display: flex;
  justify-content: space-around;
  background-color: #efefef;
}
main ol li:nth-child(8) dl {
  width: 30%;
  border-left: 1px solid #ccc;
  padding: 0 50px;
}
main ol li:nth-child(8) dl:first-child {
  border: none;
}
main ol li:nth-child(8) dl dt {
  font-size: 30px;
  line-height: 80px;
}
main ol li:nth-child(8) dl dd {
  margin: 0;
  line-height: 40px;
}

main ol li:nth-child(9) {
  text-align: center;
  padding-bottom: 0;
  font-size: 40px;
}

main ol li:nth-child(10) {
  padding-top: 30px;
  display: flex;
  justify-content: center;
  gap: 100px;
}
main ol li:nth-child(10) a {
  padding: 10px 30px;
  background-color: #00783d;
  border-radius: 20px;
  color: white;
  text-decoration: none;
}
main ol li:nth-child(10) a:last-child {
  background-color: #ff5e00;
}
main ol li:nth-child(10) a:hover {
  background-color: blue;
}

footer {
  background-color: #00783d;
  color: white;
  display: flex;
  justify-content: space-around;
  padding: 30px;
  font-size: 16px;
}
footer dl {
  width: 16.66%;
}
footer dl dt {
  line-height: 40px;
  font-size: 20px;
  opacity: 0.6;
}
footer dl dd {
  line-height: 36px;
  margin: 0;
}
footer dl a {
  color: white;
}