body {
  margin: 0;
  min-width: 1200px;
  max-width: 1920px;
}

a {
  text-decoration: none;
  color: inherit;
}

header {
    height: 541px;
    box-sizing: border-box;
    background: url(../images/header.jpg) center no-repeat;
}

nav {
    background: #2329BB;
}

nav ul {
    list-style: none;
    padding: 0;
    display: flex;
    margin: auto;
    width: 1200px;
}

nav ul li {
    flex: 1;
    position: relative;
}

nav ul a {
    display: block;
    text-align: center;
    text-decoration: none;
    color: #fff;
    line-height: 74px;
    font-size: 24px;
    font-weight: lighter;
}

nav ul a.active {
    position: relative;
}

nav ul a.active::after {
    content: '';
    display: block;
    width: 100%;
    height: 4px;
    background: linear-gradient(#FFB115, #FFB115) center/97px 4px no-repeat;
    position: absolute;
    bottom: 0;
}
nav ul .sub-menu {
    display: none;
    position: absolute;
    z-index: 10;
    flex-direction: column;
    min-width: 100%;
    background: var(--menu-item-color);
    left: 50%;
    transform: translateX(-50%);
    word-break: keep-all;
    color: inherit;
    white-space: nowrap;
    background-color: rgba(54, 94, 169, 0.6);
    font-size: 20px;
    padding: 10px 18px;
}
nav ul .sub-menu a {
    font-size: inherit;
    line-height: 2;
}

nav ul .sub-menu a:not(:last-child) {
    border-bottom: 1px dashed #fff;
    margin-bottom: 8px;
    padding-bottom: 4px;
}

nav ul li:hover .sub-menu {
    display: flex;
}

footer {
  height: 342px;
  background: url(//www.sce.com.cn/gjkc/images/footer.jpg) center no-repeat;
  color: #fff;
  padding-top: 64px;
  box-sizing: border-box;
}

footer .content {
  width: 1200px;
  margin: auto;
  display: grid;
  grid-template-columns: auto 155px;
  grid-template-rows: 81px auto 18px;
  font-size: 18px;
  font-weight: lighter;
  line-height: 1;
}

footer .link {
  display: flex;
  justify-content: space-between;
  grid-column: 1/-1;
}

footer .link a {
  color: inherit;
  text-decoration: none;
}

footer .wechat {
  grid-column: 2;
  grid-row: 2/-1;
  width: 145px;
  border: 5px solid #fff;
  border-radius: 5px;
}

.w-1200 {
  width: 1200px;
  margin: auto;
}