/* banner 整体布局开始 */
#banner {
  margin-top: 72px;
  /* 把 banner-box 挤到中间 */
  padding: 32px 0;
  /* 这个过渡，是为了渐变背景的切换自然 */
  transition: all 1s;
  background-image: url(../images/swiper/bj-4.jpg);
}

.banner-box {
  height: 482px;
  /* background-color: rgb(134, 181, 198); */
}

.g-banner {
  height: 382px;
  /* background-color: rgb(226, 192, 192); */
}

.course-list {
  width: 256px;
  height: 382px;
  background-color: #39364d;
  color: #fff;
  border-radius: 8px 0 0 0;
}

.swiper {
  width: 896px;
  height: 382px;
  border-radius: 0 8px 0 0;
  /* 父相子绝，内部的切换按钮，圆点就可以绝对定位 */
  position: relative;
}


.sys-class {
  height: 100px;
  /* background-color: rgb(200, 228, 239); */
  border-radius: 0 0 8px 8px;
  box-shadow: 0 5px 20px 0 rgb(0 0 0 / 30%);
}

/* banner 整体布局结束 */

/* 课程分类列表开始 */
.course-list ul {
  margin-top: 20px;
}

.course-list li {
  height: 50px;
  line-height: 50px;
  padding: 0 10px;
}

.course-list li:hover {
  background: rgba(255, 255, 255, .1);
  cursor: pointer;
}

.course-list .title {
  font-size: 14px;
}

.course-list .sub-title {
  font-size: 12px;
}

.course-list .iconfont {
  float: right;
  font-size: 10px;
  color: rgba(255, 255, 255, .5);
}

/* 课程分类列表结束 */

/* 轮播图 */
.swiper a {
  display: block;
  width: 896px;
  height: 382px;
  background-image: url(../images/swiper/swiper-5.jpg);
  background-size: 896px;
  border-radius: 0 8px 0 0;
  /* 1秒内完成透明度过渡 */
  transition: 1s;
}

/* 左右切换按钮 */
.swiper .arrow {
  position: absolute;
  /* 垂直居中：离顶部50%-自身高度的一半 */
  top: 50%;
  margin-top: -24px;
  width: 48px;
  height: 48px;
  /* 同时设置背景色、背景图，背景图位置，尺寸 */
  background: rgba(28, 31, 33, .2) url(../images/icon-left-small.png) no-repeat center/16px auto;
  border-radius: 50%;
  color: #fff;
  transition: .5s;
}

.swiper .arrow:hover {
  background-color: rgba(28, 31, 33, .5);
  transition: .5s;
}

.prev {
  left: 20px;
}

.next {
  right: 20px;
  /* 右三角使用左三角水平翻转180度即可，nice */
  transform: rotate(180deg);
}

/* 切图圆点 */
.circle-list {
  position: absolute;
  right: 20px;
  bottom: 15px;
}

.circle-list li {
  cursor: pointer;
  display: inline-block;
  width: 8px;
  height: 8px;
  margin-left: 4px;
  border-radius: 4px;
  background: rgba(255, 255, 255, .75);
  cursor: pointer;
  transition: all .2s;
}

.circle-list li.current {
  width: 20px;
}


/* 下方体系课 */
.show-box {
  display: inline-block;
  width: 192px;
  height: 45px;
  margin-top: 27px;
  margin-left: 15px;
}

.show-box .sys-icon {
  width: 45px;
  height: 45px;
  background-size: cover;
  margin-right: 8px;
}

.show-box .title:hover h4 {
  color: #ec1500;
}

.show-box h4 {
  font-size: 14px;
}

.show-box p {
  font-size: 12px;
}

.sys-class .line {
  display: inline-block;
  width: 2px;
  height: 40px;
  background-color: #e8e8e8;
}

.sys-class .more-btn {
  display: inline-block;
  font-size: 12px;
  margin-left: 16px;
}

.sys-class .more-btn .iconfont {
  font-size: 12px;
}

.sys-icon {
  transition: .2s;
}

.sys-icon:hover {
  transform: translateY(-2px);
}