html,
body {
  height: 100%;
  margin: 0;
}

a,
a:visited {
  color: white;
  text-decoration: none;
}

body {
  display: flex;
  flex-direction: column;
}

a.active {
  color: #263c65;
}

.flex-1 {
  flex: 1;
}

.flex {
  display: flex;
}

.flex-wrap {
  flex-wrap: wrap;
}

.nowrap {
  white-space: nowrap;
}

.navbar {
  position: absolute;
  top: 78px;
  left: 150px;
  display: flex;
  justify-content: space-between;
  align-items: center;
  right: 150px;
}

.logo {
  font-size: 50px;
  color: white;
  display: flex;
  align-items: center;
}

.logo img {
  margin-right: 25px;
}

nav {
  display: flex;
}

li {
  list-style-type: none;
  font-size: 30px;
  font-family: Heiti;
  font-weight: 500;
  line-height: 31px;
}

li + li {
  margin-left: 40px;
}

.w {
  max-width: 1620px;
  margin: auto;
}

.main {
  background: url(images/banner.png) no-repeat center;
  background-size: cover;
  width: 100%;
  min-height: 46.875vw;
}

.main-text {
  position: absolute;
  left: 150px;
  font-size: 50px;
  color: white;
  top: 22vw;
}

.main-text .big {
  font-size: 70px;
}

.main-text div + div {
  margin-top: 40px;
}

.gray-section {
  min-height: 100px;
  background: #faf9f8;
}

.about main.main {
  background: url(images/about.png) no-repeat center;
  background-size: cover;
}

.download main.main {
  background: url(images/download.png) no-repeat center;
  background-size: cover;
}

.contact main.main {
  background: url(images/contact.png) no-repeat center;
  background-size: cover;
}

.section-title {
  color: #4b4b4b;
  margin: 50px 0 115px 0;
  display: flex;
  align-items: center;
  font-size: 50px;
  justify-content: center;
}

.section-title img {
  margin-right: 40px;
}

.section-title .text {
  text-align: center;
  margin-left: 20px;
}

.text .cn {
  height: 51px;
  font-size: 42px;
  line-height: 51px;
  border-bottom: 3px solid #2d2d2d;
}

.text .en {
  height: 43px;
  font-size: 33px;
  line-height: 43px;
}

.section-1 {
  min-height: 775px;
}

.section-1-container {
  display: flex;
  align-items: center;
}

.section-1-container img {
  object-fit: cover;
  width: 100%;
  height: 454px;
}

.section-1-container .desc {
  font-size: 30px;
  line-height: 75px;
  margin-left: 160px;
}

.section-1-container .desc-title {
  font-size: 43px;
  font-weight: 500;
}

.section-2-container {
  display: flex;
  align-items: center;
  justify-content: space-between;
}

.section-2 .desc {
  padding-left: 113px;
  line-height: 46px;
  font-size: 28px;
}

.section-2-container img {
  width: 350px;
  height: 730px;
}

.section-2-container img + img {
  margin-left: 25px;
}

.section-3-container img {
  width: 100%;
}

.email-icon {
  background-image: url(images/email.png);
  background-size: 100% 100%;
  display: inline-block;
  position: absolute;
  width: 40px;
  height: 30px;
  top: 20px;
  left: -65px;
}

.address-icon {
  background-image: url(images/location.png);
  background-size: 100% 100%;
  width: 32px;
  height: 40px;
  display: inline-block;
  position: absolute;
  left: -60px;
  top: 26px;
}

.email,
.address {
  display: flex;
  position: relative;
  flex-direction: column;
}

.address {
  margin-top: 46px;
}

.section-3-container {
  display: flex;
  align-items: center;
}

.section-3-container .desc {
  font-size: 30px;
  font-weight: 500;
  color: #373737;
  line-height: 66px;
  margin-left: 130px;
}

.apk-download-icon {
  width: 43px;
  height: 55px;
  margin-right: 10px;
  object-fit: contain;
}

.apk-download {
  width: 422px;
  height: 97px;
  background: #263c65;
  border-radius: 49px;
  font-size: 40px;
  font-weight: 300;
  color: #ffffff;
  line-height: 41px;
  margin: 60px auto;
  cursor: pointer;
  display: flex;
  justify-content: center;
  align-items: center;
  font-family: Heiti;
}

footer {
  font-size: 24px;
  font-family: Heiti;
  font-weight: 500;
  color: #ffffff;
  line-height: 25px;
  background: #263c65;
  text-align: center;
  margin-top: 120px;
  padding-top: 50px;
  padding-bottom: 25px;
}

.mobile-menu-toggle {
  display: none;
  cursor: pointer;
}

.mobile-menus {
  display: none;
}

.mobile-menus.show {
  display: block;
  position: absolute;
  padding: 30px 40px;
  top: 80px;
  left: 0;
  right: 0;
  background: rgba(0, 0, 0, 0.35);
  /* backdrop-filter: blur(8px); */
}

@media (max-width: 1536px) {
  .navbar {
    top: 50px;
    left: 100px;
    right: 100px;
  }

  .main-text {
    position: absolute;
    left: 100px;
    font-size: 45px;
    color: white;
    top: 20vw;
  }

  .main-text .big {
    font-size: 60px;
  }

  .main-text div + div {
    margin-top: 25px;
  }

  .w {
    padding: 0 100px;
  }

  .section-title {
    margin: 120px 0 50px 0px;
  }

  .section-1-container .desc {
    margin-left: 80px;
  }

  .section-2-container img {
    width: 19vw;
    height: 40vw;
  }

  .section-3-container .desc {
    margin-left: 50px;
  }

  .apk-download {
    width: 400px;
    height: 80px;
    font-size: 35px;
  }
}

@media (max-width: 1024px) {
  .w {
    padding: 0 40px;
  }

  .main-text {
    position: absolute;
    left: 80px;
    font-size: 40px;
    color: white;
    top: 32vw;
  }

  .main-text .big {
    font-size: 50px;
  }

  .main-text div + div {
    margin-top: 25px;
  }

  .navbar {
    left: 80px;
    right: 80px;
  }

  .navbar nav {
    display: none;
  }

  .main,
  .download {
    min-height: 70vw;
  }

  .section-title {
    margin: 50px 0 50px 0;
    line-height: 40px;
  }

  .section-1-container,
  .section-2-container,
  .section-3-container {
    flex-direction: column;
    padding: 0;
  }

  .section-1 {
    min-height: unset;
  }

  .section-1-container .desc,
  .section-3-container .desc {
    margin: 30px 0;
  }

  .apk-download::before {
    width: 35px;
    height: 40px;
    object-fit: cover;
  }

  .about-section .section-1-container {
    flex-direction: row;
  }

  .about-section .section-1-container img {
    width: 0;
  }

  .section-2-container {
    flex-direction: row;
  }

  .section-2-container img {
    width: 20vw;
    height: 40vw;
  }

  .email-icon {
    background-image: url(images/email.png);
    background-size: 100% 100%;
    display: inline-block;
    position: absolute;
    width: 35px;
    height: 25px;
    top: 20px;
  }

  .address-icon {
    background-image: url(images/location.png);
    background-size: 100% 100%;
    display: inline-block;
    position: absolute;
    width: 32px;
    height: 35px;
    top: 20px;
    left: -64px;
  }

  .address {
    margin-top: 20px;
  }

  .apk-download {
    width: 250px;
    height: 60px;
    font-size: 25px;
  }

  .apk-download-icon {
    width: 30px;
    height: 30px;
    object-fit: contain;
  }

  footer {
    padding: 24px;
    font-size: 16px;
  }

  .mobile-menu-toggle {
    display: block;
  }

  .mobile-menu-toggle img {
    width: 40px;
    height: 40px;
    filter: invert(1);
  }

  li + li {
    margin: 0;
    margin-top: 20px;
  }
}

@media (max-width: 640px) {
  .w {
    padding: 0 20px;
  }

  .logo img {
    width: 75px;
    height: 75px;
  }

  .main-text {
    position: absolute;
    left: 40px;
    font-size: 6vw;
    color: white;
    top: 45vw;
  }

  .main-text .big {
    font-size: 8vw;
  }

  .main-text div + div {
    margin-top: 25px;
  }

  .navbar {
    left: 0;
    right: 0;
    top: 25px;
    padding: 0 40px;
  }

  .logo {
    font-size: 40px;
  }

  .main,
  .download {
    min-height: 100vw;
  }

  .section-title {
    margin: 40px 0 30px 0;
    line-height: 40px;
    font-size: 35px;
  }

  .section-title .no {
    font-size: 80px;
  }

  .text .cn {
    font-size: 32px;
  }

  .text .en {
    font-size: 27px;
  }

  .section-2-container {
    padding: 0;
    margin: 10px;
  }

  .section-1-container img,
  .section-2-container img {
    width: 100%;
  }

  .section-1-container .desc,
  .section-3-container .desc {
    font-size: 25px;
  }

  .section-2-container img + img {
    margin-left: 0;
  }

  .section-2-container {
    display: grid;
    grid-template-columns: 1fr 1fr;
    gap: 15px;
  }

  .section-2-container img {
    width: 100%;
    height: 90vw;
  }

  .address {
    margin-top: 20px;
  }

  .section-3-container {
    flex-direction: column;
  }

  .section-3-container img {
    width: 100%;
    height: 100%;
  }

  .apk-download {
    width: 250px;
    height: 60px;
    font-size: 25px;
  }

  footer {
    padding: 24px;
    font-size: 16px;
    margin-top: 90px;
  }

  .mobile-menus.show {
    top: 65px;
  }
}