header {
  position: fixed;
  top: 0;
  left: 0;
  z-index: 10;
  width: 100%;
  padding: 32px 0;
}

header .header-container {
  padding: 0 120px;
  min-width: 1560px;
  margin: 0 auto;
  display: flex;
}

header .header-container .logo {
  height: 50px;
  flex-shrink: 0;
}

header .header-container .header-right {
  flex: 1;
  display: flex;
  flex-direction: column;
  align-items: flex-end;
  margin-left: 16px;
}

header .header-container .header-right .top a {
  font-size: 16px;
  color: #fff;
  padding-left: 20px;
  margin-left: 20px;
  display: inline-block;
}

header .header-container .header-right .top a:last-child {
  border-left: 1px solid #fff;
}

header .header-container .header-right .top a img {
  width: 24px;
  height: 24px;
  vertical-align: middle;
}

header .header-container .header-right .menus {
  width: 100%;
}

header .header-container .header-right .menus > ul {
  display: flex;
  align-items: center;
  justify-content: space-between;
}

header .header-container .header-right .menus > ul > li {
  position: relative;
  margin-left: 20px;
}

header .header-container .header-right .menus > ul > li > a {
  color: #fff;
  font-size: 18px;
  font-weight: bold;
}

header .header-container .header-right .menus > ul > li:hover .submenu {
  display: block;
}

header .header-container .header-right .menus > ul > li .submenu {
  display: none;
  position: absolute;
  padding: 8px;
  background-color: #fff;
}

header .header-container .header-right .menus > ul > li .submenu > li {
  padding: 4px;
  white-space: nowrap;
}

header .header-container .header-right .menus > ul > li .submenu > li:hover {
  background-color: #1a76ff;
}

header .header-container .header-right .menus > ul > li .submenu > li:hover a {
  color: #fff !important;
  font-weight: bold;
}

header .header-container .header-right .menus > ul > li .submenu > li a {
  color: #333;
}

footer {
  width: 100%;
  height: 100px;
  background-color: #0e70ff;
}

footer .footer-container {
  width: 1200px;
  height: 100%;
  margin: 0 auto;
  display: flex;
  flex-direction: column;
  align-items: center;
  justify-content: center;
}

footer .footer-container p {
  margin-bottom: 8px;
}

footer .footer-container p span {
  color: #fff;
  font-size: 16px;
  padding: 0 12px;
}

.search-box {
  position: fixed;
  width: 100%;
  height: 100%;
  top: 0;
  left: 0;
  background: rgba(0, 0, 0, 0.4);
  z-index: 999;
}

.search-box .search-container {
  width: 80%;
  height: 120px;
  background: #fff;
  position: absolute;
  border-radius: 4px;
  left: 50%;
  top: 30%;
  transform: translateX(-50%);
  padding: 40px;
}

@media screen and (max-width: 750px) {
  .search-box .search-container {
    height: 1.2rem;
    padding: 0.4rem;
    border-radius: 0.04rem;
  }
}

.search-box .search-container .close {
  position: absolute;
  right: 8px;
  top: 8px;
  width: 24px;
  height: 24px;
  background: url("../img/close.png") no-repeat;
  background-size: 100% 100%;
  cursor: pointer;
}

@media screen and (max-width: 750px) {
  .search-box .search-container {
    right: 0.08rem;
    top: 0.08rem;
    width: 0.24rem;
    height: 0.24rem;
  }
}

.search-box .search-container input {
  width: 100%;
  vertical-align: top;
  height: 40px;
  padding: 0 16px;
  font-size: 20px;
  color: #333;
  border: 1px solid #666;
  border-radius: 4px;
}

@media screen and (max-width: 750px) {
  .search-box .search-container input {
    height: 0.4rem;
    padding: 0 0.16rem;
    font-size: 0.2rem;
    border-radius: 0.04rem;
  }
}

.search-box .search-container input:focus-visible {
  outline: none;
  border: 1px solid #666;
}

.main .banner {
  width: 100%;
  height: 260px;
}

.main .banner img {
  width: 100%;
  height: 100%;
  object-fit: cover;
}

.main .layout {
  width: 1560px;
  margin: 0 auto;
  display: flex;
}

.main .layout .sidebar {
  width: 300px;
  flex-shrink: 0;
  position: relative;
  top: -76px;
}

.main .layout .sidebar .top {
  height: 76px;
  line-height: 76px;
  padding-left: 40px;
  color: #fff;
  font-size: 24px;
  background-color: rgba(14, 112, 255, 0.7);
}

.main .layout .sidebar .subs {
  min-height: 330px;
  font-size: 0;
  background: #f2f4f5;
}

.main .layout .sidebar .subs a {
  display: inline-block;
  width: 100%;
  height: 66px;
  line-height: 66px;
  padding-left: 40px;
  font-size: 20px;
  color: #666;
}

.main .layout .sidebar .subs a:hover {
  background-color: #0e70ff;
  color: #fff;
}

.main .layout .container {
  flex: 1;
  margin-left: 32px;
  overflow: hidden;
}

.main .layout .container .breadcrumb {
  display: flex;
  height: 56px;
  align-items: center;
  justify-content: space-between;
  padding-left: 30px;
  position: relative;
  border-bottom: 1px solid #dddfe4;
}

.main .layout .container .breadcrumb::before {
  content: "";
  position: absolute;
  left: 8px;
  top: 50%;
  transform: translateY(-50%);
  width: 4px;
  height: 18px;
  background-color: #0e70ff;
  border-radius: 2px;
}

.main .layout .container .breadcrumb span:first-child {
  font-size: 24px;
  color: #333;
  font-weight: bold;
}

.main .layout .container .breadcrumb span:last-child {
  color: #0e70ff;
  font-size: 14px;
}

.main .layout .container .columns {
  font-size: 0;
  padding-bottom: 100px;
}

.main .layout .container .columns .column {
  display: flex;
  align-items: center;
  height: 66px;
  border-bottom: 1px solid #dddfe4;
  padding-left: 30px;
  padding-right: 18px;
  position: relative;
}

.main .layout .container .columns .column::before {
  content: "";
  position: absolute;
  left: 8px;
  top: 50%;
  transform: translateY(-50%);
  width: 8px;
  height: 8px;
  border-radius: 50%;
  background-color: #0e70ff;
}

.main .layout .container .columns .column span {
  font-size: 18px;
}

.main .layout .container .columns .column span:first-child {
  flex-shrink: 0;
  color: #666;
  margin-right: 32px;
}

.main .layout .container .columns .column span:last-child {
  font-size: 18px;
  color: #333;
  white-space: nowrap;
  overflow: hidden;
  text-overflow: ellipsis;
}

.main .layout .container .detail {
  padding-bottom: 50px;
}

.main .layout .container .detail > .title {
  margin-top: 40px;
  padding-bottom: 16px;
  text-align: center;
  font-size: 24px;
  color: #333;
  font-weight: bold;
  border-bottom: 1px solid #ddd;
}

.main .layout .container .detail > .subtitle {
  text-align: center;
  margin-top: 30px;
  font-size: 14px;
  color: #999;
}

.main .layout .container .detail .content {
  margin-top: 30px;
  font-size: 20px !important;
  color: #333;
}

.main .layout .container .detail .content img {
  height: auto;
}

.main .layout .container .detail .quick {
  margin-top: 140px;
}

.main .layout .container .detail .quick p {
  font-size: 20px;
  color: #333;
}

.main .layout .container .detail .quick p:first-child a {
  color: #666;
}

.main .layout .container .detail .quick p:last-child a {
  color: #0e70ff;
}

.main .layout .container .teachers {
  margin-top: 30px;
}

.main .layout .container .teachers .choice button {
  width: 170px;
  height: 60px;
  line-height: 60px;
  border: none;
  background-color: #eee;
  border-radius: 4px;
  font-size: 18px;
  color: #666;
  text-align: center;
  margin-right: 10px;
  cursor: pointer;
}

.main .layout .container .teachers .choice button.active {
  border: 1px solid #0e70ff;
  color: #0e70ff;
  background-color: #fff;
}

.main .layout .container .teachers .results {
  margin-top: 48px;
  display: none;
}

.main .layout .container .teachers .results.active {
  display: block;
}

.main .layout .container .teachers .results .block {
  border-bottom: 1px dashed #979797;
  margin-bottom: 24px;
}

.main .layout .container .teachers .results .block .title {
  font-size: 22px;
  font-weight: bold;
  color: #333;
  padding-left: 16px;
  position: relative;
}

.main .layout .container .teachers .results .block .title::before {
  content: "";
  position: absolute;
  left: 0;
  top: 50%;
  transform: translateY(-50%);
  width: 4px;
  height: 20px;
  border-radius: 4px;
  background-color: #0e70ff;
}

.main .layout .container .teachers .results .block .names {
  display: flex;
  flex-wrap: wrap;
  margin-top: 20px;
}

.main .layout .container .teachers .results .block .names > a {
  width: 12.5%;
  margin-bottom: 12px;
}

.main .layout .container .teachers .results .block .names > a:hover {
  font-weight: bold;
  color: #0e70ff;
}

.main .layout .container .teacher {
  padding-bottom: 100px;
}

.main .layout .container .teacher .teacher-info {
  margin-top: 18px;
  background-color: #f3f8ff;
  padding: 12px 24px;
  display: flex;
  align-items: center;
}

.main .layout .container .teacher .teacher-info .avatar {
  width: 180px;
  height: auto;
  flex-shrink: 0;
}

.main .layout .container .teacher .teacher-info .introduction {
  flex: 1;
  margin-left: 48px;
}

.main .layout .container .teacher .teacher-info .introduction .name span:first-child {
  font-size: 26px;
  font-weight: bold;
}

.main .layout .container .teacher .teacher-info .introduction .name span:last-child {
  font-size: 18px;
  color: #0e70ff;
  padding-left: 24px;
}

.main .layout .container .teacher .teacher-info .introduction p {
  font-size: 18px;
  color: #333;
  margin-bottom: 24px;
}

.main .layout .container .teacher .block {
  margin-top: 24px;
}

.main .layout .container .teacher .block .title {
  margin-bottom: 24px;
  font-size: 20px;
  color: #0e70ff;
  font-weight: bold;
}

.main .layout .container .teacher .block .content {
  font-size: 16px;
  color: #333;
}

.main .layout .container .teacher .block .content p {
  margin-bottom: 4px;
}