html {
  scroll-behavior: smooth;
}
body {
  margin: 0;
  padding: 0;
  font-family: -apple-system, BlinkMacSystemFont, Helvetica Neue, Helvetica,
    Arial, PingFang SC, Hiragino Sans GB, Microsoft YaHei, sans-serif;
}
a,
a:visited {
  text-decoration: none;
  color: inherit;
}

.clearfix:after {
  visibility: hidden;
  display: block;
  font-size: 0;
  content: ' ';
  clear: both;
  height: 0;
}

.is-xm,
.is-sm,
.is-md,
.is-lg {
  display: none;
}

/* #region 顶部通栏 */
.header {
  position: sticky;
  top: 0;
  z-index: 10;
  width: 100%;
  height: 60px;
  padding-top: 10px;
  background: url(../img/page_bg1.png) top left / 100% 850px no-repeat;
}
.header-center {
  height: 50px;
  display: flex;
  justify-content: start;
  align-items: center;
  margin: 0 auto;
  font-weight: 500;
  font-size: 18px;
  color: #fff;
}
.header-logo {
  height: 100%;
  margin-right: 300px;
}

.header-logo img {
  height: 100%;
}

.header-center > .header-link {
  margin-right: 30px;
  cursor: pointer;
}
.header-center > .header-link:last-child {
  margin-right: 0;
}
.header-drop-menu {
  display: none;
}
/* #endregion 顶部通栏 */

.box {
  background: url(../img/page_bg1.png) top left / 100% 850px no-repeat,
    url(../img/page_bg2.png) bottom left / 100% 320px no-repeat;
}

.box .sec-title {
  font-size: 72px;
  font-weight: normal;
  line-height: 1.8;
  margin: 0;
}
.box .sec-subtitle {
  font-size: 24px;
  font-weight: normal;
  line-height: 1.8;
  margin: 0;
}

.sec1 {
  padding-top: 60px;
  padding-left: 40px;
  display: flex;
  justify-content: center;
  align-items: center;
}
.sec1 .sec-text {
  text-align: right;
  color: #fff;
}
.sec1 .sec-title {
  margin-top: 50px;
  margin-bottom: 50px;
  font-size: 44px;
  font-weight: bold;
}
.sec1 .sec-subtitle {
  font-size: 32px;
  font-weight: normal;
}

.sec1 .sec1-img {
  width: 700px;
  margin-left: 50px;
}

.sec2 {
  padding-top: 300px;
  display: flex;
  align-items: center;
}
.sec2 .sec-gallery {
  width: 700px;
  text-align: right;
  background: url(../img/bullet_left.png) center left/ 100% no-repeat;
}
.sec2 .sec-phone-img {
  /* width: 380px; */
  width: 500px;
  margin-right: 10%;
}
.sec2 .sec-text {
  margin-left: 10%;
}
.sec2 .sec-icon {
  width: 133px;
}

.sec3 {
  padding-top: 70px;
  display: flex;
  justify-content: end;
  align-items: center;
}
.sec3 .sec-gallery {
  width: 700px;
  text-align: left;
  background: url(../img/bullet_right.png) center right/ 100% no-repeat;
}
.sec3 .sec-phone-img {
  width: 500px;
  margin-left: 6%;
}
.sec3 .sec-text {
  margin-right: 10%;
  text-align: right;
}
.sec3 .sec-icon {
  width: 133px;
  margin-right: 10%;
}

.sec4 {
  padding-top: 70px;
  display: flex;
  align-items: center;
}
.sec4 .sec-gallery {
  width: 700px;
  text-align: right;
  background: url(../img/bullet_left.png) center left/ 100% no-repeat;
}
.sec4 .sec-phone-img {
  width: 500px;
  margin-right: 10%;
}
.sec4 .sec-text {
  margin-left: 10%;
}
.sec4 .sec-icon {
  width: 133px;
}

/* #region sec5 */
.sec5 {
  margin-top: 60px;
  text-align: center;
}
.ask-icon {
  width: 70px;
}
.ask-title {
  margin: 35px 0;
  font-size: 30px;
  line-height: 1;
  font-weight: normal;
}

.ask-card-list {
  width: 80%;
  margin: 50px auto 0;
  display: flex;
  align-items: start;
  justify-content: space-between;
}
.ask-card-col {
  width: calc(50% - 20px);
}
.ask-card {
  position: relative;
  padding: 0 60px 0 25px;
  background-color: #fff;
  border: 1px solid #d7d7d7;
  border-radius: 10px;
  margin-top: 30px;
}
.card-title {
  margin: 0;
  padding: 25px 0;
  color: #2c343b;
  font-size: 17px;
  font-weight: normal;
  cursor: pointer;
  user-select: none;
}
.card-detail {
  margin: 0;
  height: 0;
  color: #8491a5;
  font-size: 15px;
  font-weight: normal;
  overflow: hidden;
  transition: all 0.5s ease-in-out;
  text-align: left;
}

.ask-card.active .card-detail {
  padding-bottom: 25px;
}

.card-arrow {
  position: absolute;
  top: 50px;
  right: 25px;
  width: 14px;
  height: 14px;
  border-right: 1px solid #8491a5;
  border-bottom: 1px solid #8491a5;
  transform: translateY(-50%) rotate(45deg);
  transition: transform 0.5s ease-in-out;
}

.ask-card.active .card-arrow {
  transform: translateY(-50%) rotate(-135deg);
}
/* #endregion sec5 */

/* #region sec6 */
.sec6 {
  width: 100%;
  margin-top: 100px;
  text-align: center;
}
.say-icon {
  width: 70px;
}
.say-title {
  margin: 35px 0;
  font-size: 30px;
  line-height: 1;
  font-weight: normal;
}
.say-list {
  display: flex;
  width: 80%;
  margin: 80px auto 0;
  gap: 30px;
  justify-content: space-between;
}
.say-item {
  width: calc(33% - 20px);
  position: relative;
  background-color: #fff;
  border-radius: 5px;
  filter: drop-shadow(0 2px 8px rgba(75, 81, 91, 0.14));
}
.say-item::after {
  content: '';
  position: absolute;
  width: 0;
  height: 0;
  border-style: solid;
  bottom: -22px;
  left: 62px;
  border-width: 22px 32px 0 0;
  border-color: #ffffff transparent transparent transparent;
}
.say-item-head {
  font-size: 17px;
  font-weight: bold;
  color: #262f3c;
  padding: 30px 20px 20px 25px;
}
.say-item-main {
  padding: 22px 20px 22px 25px;
  border-top: 1px solid #ebebeb;
  font-size: 17px;
  font-weight: normal;
  color: #8491a5;
}
/* #endregion sec6 */

/* #region footer */
.footer {
  margin-top: 200px;
  text-align: center;
  padding-bottom: 60px;
}
.footer-title {
  color: #fff;
  font-size: 28px;
  line-height: 3;
}
.footer-email {
  color: #333;
  font-size: 22px;
}
.footer-desc {
  color: #ebebeb;
  font-size: 18px;
}
/* #endregion footer */

/* #region 响应式适配 */
@media screen and (max-width: 1320px) {
  .header-center {
    justify-content: center;
  }
  .box .sec-title {
    font-size: 56px;
  }
  .sec1 {
    flex-direction: column;
    padding-left: 0;
  }
  .sec1 .sec-text {
    text-align: left;
  }
  .sec1 .sec-title {
    margin-top: 0;
    margin-bottom: 20px;
  }
  .sec1 .sec-subtitle {
    margin-bottom: 50px;
    text-indent: 50px;
  }
  .sec1 .sec1-img {
    margin-left: 0;
  }

  .sec2 {
    padding-top: 200px;
  }
  .sec2 .sec-gallery {
    width: 580px;
  }
  .sec2 .sec-phone-img {
    width: 400px;
  }
  .sec2 .sec-text {
    margin-left: 40px;
  }
  .sec2 .sec-icon {
    margin-left: 50px;
  }

  .sec3 .sec-gallery {
    width: 580px;
  }
  .sec3 .sec-phone-img {
    width: 400px;
  }
  .sec3 .sec-text {
    margin-right: 40px;
  }
  .sec3 .sec-icon {
    margin-right: 50px;
  }

  .sec4 .sec-gallery {
    width: 580px;
  }
  .sec4 .sec-phone-img {
    width: 400px;
  }
  .sec4 .sec-text {
    margin-left: 40px;
  }
  .sec4 .sec-icon {
    margin-left: 50px;
  }
}

/* xm & sm & md */
@media screen and (max-width: 1023px) {
  .header {
    background: url(../img/page_bg1.png) top left / 100% 500px no-repeat;
  }
  .box {
    background: url(../img/page_bg1.png) top left / 100% 500px no-repeat,
      url(../img/page_bg2.png) bottom left / 100% 320px no-repeat;
  }
  .header-center {
    width: 80%;
    margin: 0 auto;
  }
  .header-logo {
    margin-right: auto;
  }
  .sec2 {
    flex-direction: column-reverse;
    align-items: start;
  }
  .sec2 .sec-text {
    width: 100%;
    text-align: center;
    margin-left: 0;
    margin-bottom: 80px;
  }
  .sec2 .sec-icon {
    margin-left: 0;
  }
  .sec2 .sec-gallery {
    width: 80%;
  }

  .sec3 {
    flex-direction: column;
    align-items: end;
  }
  .sec3 .sec-text {
    width: 100%;
    padding-top: 100px;
    text-align: center;
    margin-right: 0;
    margin-bottom: 80px;
  }
  .sec3 .sec-icon {
    margin-right: 0;
  }
  .sec3 .sec-gallery {
    width: 80%;
  }

  .sec4 {
    padding-top: 100px;
    flex-direction: column-reverse;
    align-items: start;
  }
  .sec4 .sec-text {
    width: 100%;
    text-align: center;
    margin-left: 0;
    margin-bottom: 80px;
  }
  .sec4 .sec-icon {
    margin-left: 0;
  }
  .sec4 .sec-gallery {
    width: 80%;
  }

  .ask-card-list {
    justify-content: center;
    flex-wrap: wrap;
  }
  .ask-card-col {
    width: 100%;
    text-align: left;
  }
}

@media screen and (max-width: 900px) {
  .box .sec-title {
    font-size: 48px;
  }

  .sec1 .sec1-img {
    width: 90%;
  }
  .sec2 {
    padding-top: 100px;
  }

  .say-list {
    flex-wrap: wrap;
    justify-content: center;
    gap: 70px;
  }
  .say-item {
    width: 100%;
  }

  .footer {
    width: 80%;
    margin: 100px auto 0;
    padding-bottom: 60px;
  }
}

/* xm */
@media screen and (max-width: 639px) {
  .is-xm {
    display: unset;
  }

  /* #region 头部 */
  .close-icon {
    display: none;
  }
  .close-icon,
  .menu-icon {
    cursor: pointer;
  }

  .header-drop-menu {
    box-sizing: border-box;
    display: block;
    position: absolute;
    bottom: 0;
    left: 0;
    width: 100%;
    padding: 32px;
    background-color: #fff;
    transform: translateY(100%) scaleY(0);
    transform-origin: top center;
    transition: transform 0.2s ease-in-out;
    box-shadow: 0 2px 8px rgba(75, 81, 91, 0.14);
  }
  .header-drop-menu .menu-item-link {
    display: block;
    margin-bottom: 40px;
    font-size: 7rem;
  }

  .header.is-show-drop-menu .menu-icon {
    display: none;
  }
  .header.is-show-drop-menu .close-icon {
    display: inline;
  }
  .header.is-show-drop-menu .header-drop-menu {
    transform: translateY(100%) scaleY(1);
  }
  /* #endregion 头部 */

  .header {
    background: url(../img/page_bg1.png) top center / auto 140rem no-repeat;
  }
  .box {
    background: url(../img/page_bg1.png) top center / auto 140rem no-repeat,
      url(../img/page_bg2.png) bottom left / 100% 90rem no-repeat;
  }

  .box .sec-phone-img {
    width: 70%;
  }

  .box .sec-title {
    font-size: 8rem;
  }
  .box .sec-subtitle {
    font-size: 5rem;
  }
  .box .sec-icon {
    width: 90px;
    margin-bottom: 30px;
  }
  .sec1 .sec-text {
    width: 80%;
    margin: 0 auto 20px;
  }
  .sec1 .sec-subtitle {
    font-size: 5.5rem;
    text-indent: 0;
  }

  .footer {
    padding-bottom: 10rem;
  }
  .footer-title {
    font-size: 6.8rem;
    margin-bottom: 0;
  }
  .footer-email {
    font-size: 6rem;
  }
  .footer-desc {
    font-size: 5.5rem;
  }
}

/* md */
@media screen and (min-width: 640px) and (max-width: 1023px) {
  .is-md {
    display: unset;
  }
}

/* lg */
@media screen and (min-width: 1024px) {
  .is-lg {
    display: unset;
  }
}

/* #endregion 响应式适配 */