/*css color*/
:root {
  --transparent: rgba(0, 0, 0, 0);
  --transition: all 0.2s linear;
  --c-bg: #e4e8f1;
  --c-tit: #51555e;
  --c-des: #51555e;
  --c-name: #009fbd;
  --c-hbg: #eaeaea;
  --c-video: #ffffff;
  --c-vbg: #3a415f;
  --c-mbg: #e4e8f1;
  --c-cbg: #f7f7f9;
  --c-fbg: #ffffff;
  --borders: 1px solid #bebebe;
}
/*css color*/
/*less-var*/
.center {
  line-height: 1;
  display: flex;
  align-items: center;
  justify-content: center;
}
/*less-var*/
/*banner*/
.banner img {
  width: 100%;
  vertical-align: middle;
}
.banner h2 {
  font-size: 0;
  color: var(--transparent);
  height: 0;
  overflow: hidden;
}
/*banner*/
/*public mod*/
/*public mod*/
[sicon] {
  display: inline-flex;
  width: auto;
  height: auto;
  align-items: center;
  justify-content: center;
  transition: var(--transition);
}
.svg-icon {
  width: 1em;
  height: 1em;
  font-size: 1em;
  fill: currentColor;
  overflow: hidden;
}
.main-content {
  counter-reset: serial;
  background-color: var(--c-mbg);
}
.section {
  counter-increment: serial;
  margin: 80px 0 0;
}
.sec-title {
  padding: 0 180px 0 40px;
  line-height: 75px;
  font-size: 32px;
  font-weight: bold;
  color: var(--c-tit);
  position: relative;
}
.sec-title::before {
  content: "";
  width: 100%;
  height: 75px;
  position: absolute;
  left: 0;
  top: 0;
  background: no-repeat;
  background-position: left top;
  background-size: contain;
}
.sec-title::after {
  content: "";
  position: absolute;
  width: 100%;
  height: 94px;
  left: 0;
  top: 100%;
  margin-top: -16px;
  background: no-repeat;
  background-position: left top;
  background-size: contain;
}
.sec-title-serial {
  color: var(--c-name);
  margin-right: 10px;
  position: relative;
  z-index: 2;
}
.sec-title-serial::before {
  content: "No.";
}
.sec-title-serial::after {
  content: counter(serial);
}
.sec-title-con {
  position: relative;
  z-index: 2;
}
.sec-content {
  background: var(--c-cbg);
  position: relative;
  overflow: visible;
  margin-top: 74px;
  padding-bottom: 60px;
}
.sec-content::after {
  content: "";
  position: absolute;
  left: 0;
  top: 100%;
  height: 30px;
  width: 100%;
  background: no-repeat center;
  background-size: contain;
}
.sec-des,
.sec-lecturer {
  margin: 30px 0 0;
  font-size: 14px;
  line-height: 20px;
  color: var(--c-des);
  padding: 0 40px;
  box-sizing: border-box;
}
.sec-des::before,
.sec-lecturer::before {
  content: "";
  display: block;
  height: 40px;
  width: 410px;
  margin: 0 0 20px;
  background: url(../images/adron/introductin.png);
}
.sec-des h5,
.sec-lecturer h5 {
  height: 0;
  overflow: hidden;
  font-size: 0;
}
.sec-des h6,
.sec-lecturer h6 {
  color: var(--c-name);
  line-height: 24px;
  font-size: 18px;
}
.sec-des p,
.sec-lecturer p {
  margin: 10px 0 0;
  font-size: 14px;
  color: var(--c-des);
  line-height: 20px;
}
.sec-lecturer::before {
  width: 331px;
  background: url(../images/adron/lecturer.png);
}
.sec-videos {
  display: grid;
  grid-template-columns: 1fr 1fr;
  gap: 32px;
  counter-reset: videos;
  padding: 0 40px;
  box-sizing: border-box;
  margin: 50px 0 0;
}
.sec-videos li {
  position: relative;
  counter-increment: videos;
  display: flex;
  flex-direction: column;
  align-items: center;
  transition: var(--transition);
}
.sec-videos video {
  width: 100%;
  height: auto;
}
.sec-videos p {
  color: var(--c-video);
  font-size: 24px;
  line-height: 1;
  display: flex;
  align-items: center;
  justify-content: center;
  padding-left: 64px;
  height: 64px;
  width: 100%;
  position: relative;
  box-sizing: border-box;
  background-color: var(--c-vbg);
}
.sec-videos p::before {
  content: counters(videos, "0");
  line-height: 1;
  display: flex;
  align-items: center;
  justify-content: center;
  width: 64px;
  height: 64px;
  background-color: var(--c-name);
  position: absolute;
  left: 0;
  top: 0;
}
.sec-files {
  margin-top: 50px;
  padding: 0 40px;
  display: grid;
  grid-template-columns: 1fr 1fr;
  grid-template-rows: 96px;
  gap: 32px;
}
.sec-files li {
  box-sizing: border-box;
  background-color: var(--c-fbg);
  padding: 16px 30px;
  padding-right: 0;
  display: flex;
  align-items: center;
  transition: var(--transition);
}
.sec-files li > * {
  flex: 0 0 auto;
}
.sec-files li .file-detail {
  flex: 1 1 auto;
}
.sec-files li [sicon="download"] {
  width: 48px;
  height: 48px;
  display: inline-block;
  margin: 24px;
  color: var(--c-des);
  font-size: 48px;
}
.file-icon {
  display: inline-block;
  width: 52px;
  height: 64px;
  background: url(../images/svg/file_pdf.svg) no-repeat center;
  background-size: contain;
  margin-right: 34px;
}
.file-detail {
  height: 64px;
  border-right: var(--borders);
  display: flex;
  flex-direction: column;
  justify-content: center;
}
.file-type {
  font-size: 18px;
  color: var(--c-des);
  line-height: 24px;
}
.file-name {
  font-size: 24px;
  color: var(--c-des);
  line-height: 32px;
}
/*about*/
.about {
  background-color: #3a415f;
  margin-top: 134px;
  padding: 60px 0 80px;
}
.about-title {
  font-size: 24px;
  line-height: 32px;
  color: #bbbfc8;
  font-weight: bold;
}
.about-con {
  display: flex;
  align-items: center;
}
.about-con p {
  font-size: 16px;
  line-height: 28px;
  color: #bbbfc8;
}
.about-logo {
  width: 230px;
  height: 145px;
  background: no-repeat center;
  background-size: contain;
  margin-right: 30px;
  flex: 0 0 auto;
}
/*about*/
/*pc非继承样式*/
@media screen and (min-width: 768px) {
  .main-content {
    min-width: 1200px;
  }
  .sec-layout {
    width: 1200px;
    margin: 0 auto;
  }
  .m_show {
    display: none;
  }
  .sec-files li:hover {
    background-color: var(--c-hbg);
    cursor: pointer;
  }
  .sec-files li:hover [sicon="download"] {
    color: var(--c-name);
  }
  .section {
    position: relative;
  }
  .section::after,
  .section::before {
    content: "";
    background: no-repeat;
    background-size: cover;
    position: absolute;
  }
  .section .sec-layout {
    position: relative;
    z-index: 2;
  }
  .section:nth-of-type(2)::before {
    position: absolute;
    width: 100%;
    height: 810px;
    left: 0;
    top: 300px;
    background-image: url(../images/adron/a_1-1.png);
    background-position: center;
  }
  .section:nth-of-type(2)::after {
    width: 100%;
    top: calc(100% + 54px);
    left: 0;
    height: 34px;
    background-image: url(../images/adron/a_1-2.png);
    background-position: center;
  }
  .section:nth-of-type(2) .sec-title::before {
    background-image: url(../images/adron/1-1.png);
  }
  .section:nth-of-type(2) .sec-title::after {
    background-image: url(../images/adron/1-2.png);
  }
  .section:nth-of-type(2) .sec-content::after {
    background-image: url(../images/adron/1-3.png);
  }
  .section:nth-of-type(3) {
    margin-top: 110px;
  }
  .section:nth-of-type(3)::before {
    width: 145px;
    height: 1891px;
    left: 0;
    top: 211px;
    background-image: url(../images/adron/a_2-1.png);
    background-position: center;
  }
  .section:nth-of-type(3)::after {
    width: 148px;
    height: 1381px;
    right: 0;
    left: auto;
    top: 104px;
    background-image: url(../images/adron/a_2-1.png);
    background-position: center;
  }
  .section:nth-of-type(3) .sec-title {
    line-height: 92px;
  }
  .section:nth-of-type(3) .sec-title::before {
    background-image: url(../images/adron/2-1.png);
    height: 92px;
  }
  .section:nth-of-type(3) .sec-title::after {
    background-image: url(../images/adron/2-2.png);
  }
  .section:nth-of-type(3) .sec-content::after {
    background-image: url(../images/adron/2-3.png);
  }
  .section:nth-of-type(4)::before {
    position: absolute;
    width: 100%;
    height: 1078px;
    left: 0;
    top: 18px;
    background-image: url(../images/adron/a_3-1.png);
    background-position: center;
  }
  .section:nth-of-type(4) .sec-title::before {
    background-image: url(../images/adron/3-1.png);
  }
  .section:nth-of-type(4) .sec-title::after {
    background-image: url(../images/adron/3-2.png);
  }
  .section:nth-of-type(4) .sec-content::after {
    background-image: url(../images/adron/3-3.png);
  }
  .sec-videos li:hover {
    opacity: 0.8;
  }
}
/*mob样式*/
@media screen and (max-width: 768px) {
  html {
    font-size: calc(100vw / 375);
  }
  .pc_show {
    display: none;
  }
  #top {
    display: none;
  }
  .main-content {
    counter-reset: serial;
    background-color: var(--c-mbg);
  }
  .section {
    counter-increment: serial;
    margin-top: 30rem;
  }
  .sec-layout {
    box-sizing: border-box;
    padding: 0 16rem;
  }
  .sec-title {
    line-height: 42rem;
    font-size: 18rem;
    padding: 0;
    padding-left: 15rem;
  }
  .sec-title::before {
    height: 42rem;
  }
  .sec-title::after {
    height: 32rem;
    margin-top: -3rem;
  }
  .sec-title-serial {
    margin-right: 4rem;
  }
  .sec-content {
    margin-top: 27rem;
    padding-bottom: 26rem;
  }
  .sec-content::after {
    height: 8rem;
  }
  .sec-des,
  .sec-lecturer {
    margin: 26rem 0 0;
    font-size: 14rem;
    line-height: 24rem;
    padding: 0 15rem;
    display: inline-block;
  }
  .sec-des::before,
  .sec-lecturer::before {
    height: 26rem;
    width: 250rem;
    margin: 0 0 15rem;
    background: url(../images/adron/m_introductin.png) no-repeat;
    background-position: left top;
  }
  .sec-des h6,
  .sec-lecturer h6 {
    margin: 16rem 0 0;
    line-height: 22rem;
    font-size: 16rem;
  }
  .sec-des p,
  .sec-lecturer p {
    margin: 4rem 0 0;
    font-size: 14rem;
    line-height: 24rem;
  }
  .sec-lecturer {
    margin-top: 30rem;
  }
  .sec-lecturer::before {
    width: 204rem;
    background: url(../images/adron/m_lecturer.png);
  }
  .sec-videos {
    grid-template-columns: 1fr;
    gap: 8rem;
    padding: 0 15rem;
    margin: 30rem 0 0;
  }
  .sec-videos p {
    font-size: 14rem;
    padding-left: 36rem;
    height: 36rem;
  }
  .sec-videos p::before {
    width: 36rem;
    height: 36rem;
  }
  .sec-files {
    margin-top: 20rem;
    padding: 0 15rem;
    grid-template-columns: 1fr;
    grid-template-rows: 56rem;
    gap: 8rem;
  }
  .sec-files li {
    padding: 10rem 15rem;
    padding-right: 0;
  }
  .sec-files li [sicon="download"] {
    width: 28rem;
    height: 28rem;
    margin: 15rem;
    font-size: 28rem;
  }
  .file-icon {
    width: 30rem;
    height: 37rem;
    margin-right: 16rem;
  }
  .file-detail {
    height: 37rem;
  }
  .file-type {
    font-size: 12rem;
    line-height: 14rem;
  }
  .file-name {
    font-size: 14rem;
    line-height: 18rem;
  }
  /*about*/
  .about {
    margin-top: 38rem;
    padding: 10rem 0 40rem;
  }
  .about-title {
    font-size: 18rem;
    line-height: 98rem;
  }
  .about-con {
    position: relative;
    margin-top: 10rem;
  }
  .about-con p {
    font-size: 14rem;
    line-height: 24rem;
  }
  .about-logo {
    width: 155rem;
    height: 98rem;
    margin-right: 0;
    position: absolute;
    bottom: 100%;
    right: 0;
    transform: translate(0, -10rem);
  }
  /*about*/
  .sec-files li:active {
    background-color: var(--c-hbg);
  }
  .sec-files li:active [sicon="download"] {
    color: var(--c-name);
  }
  .section .sec-layout {
    position: relative;
    z-index: 2;
  }
  .section:nth-of-type(2) .sec-title::before {
    background-image: url(../images/adron/m1-1.png);
  }
  .section:nth-of-type(2) .sec-title::after {
    background-image: url(../images/adron/m1-2.png);
  }
  .section:nth-of-type(2) .sec-content::after {
    background-image: url(../images/adron/m1-3.png);
  }
  .section:nth-of-type(3) .sec-title {
    line-height: 50rem;
  }
  .section:nth-of-type(3) .sec-title::before {
    background-image: url(../images/adron/m2-1.png);
    height: 50rem;
  }
  .section:nth-of-type(3) .sec-title::after {
    background-image: url(../images/adron/m2-2.png);
  }
  .section:nth-of-type(3) .sec-content::after {
    background-image: url(../images/adron/m2-3.png);
  }
  .section:nth-of-type(4) .sec-title {
    height: 65rem;
    line-height: 22rem;
    padding-top: 9rem;
    display: flex;
    box-sizing: border-box;
  }
  .section:nth-of-type(4) .sec-title::before {
    height: 65rem;
    background-image: url(../images/adron/m3-1.png);
  }
  .section:nth-of-type(4) .sec-title::after {
    background-image: url(../images/adron/m3-2.png);
  }
  .section:nth-of-type(4) .sec-title .sec-title-con {
    width: 220rem;
  }
  .section:nth-of-type(4) .sec-content::after {
    background-image: url(../images/adron/m3-3.png);
  }
  .sec-videos li:active {
    opacity: 0.8;
  }
}