main {
  overflow-x: hidden;
}

section {
  margin-bottom: 260px;
  padding: 0 32px;
}

h1 {
  color: #fff;
  text-shadow: 0 0 30px rgba(0, 0, 0, 0.3);
  font-family: MiSans;
  font-size: 64px;
  font-style: normal;
  font-weight: 700;
  line-height: 85px;
  letter-spacing: 3.84px;
  text-align: center;
}

/* 首页面 */
.first {
  position: relative;
  z-index: 1;
  display: flex;
  flex-direction: column;
  justify-content: center;
  align-items: center;
  gap: 16px;
  height: 100vh;
}

.first p {
  color: #fff;
  text-align: center;
  text-shadow: 0 0 30px rgba(0, 0, 0, 0.3);
  font-family: 'PingFang SC';
  font-size: 24px;
  font-style: normal;
  font-weight: 300;
  line-height: normal;
}

.first .downloads {
  position: absolute;
  z-index: -1;
  bottom: 92px;
}

.first video {
  position: absolute;
  top: 0;
  left: 0;
  width: 100%;
  height: 100%;
  object-fit: cover;
  z-index: -2;
}

.first::before {
  content: '';
  position: absolute;
  top: 0;
  left: 0;
  width: 100%;
  height: 100%;
  background: rgba(0, 0, 0, 0.4);
  z-index: -1;
}

.first::after {
  content: '';
  position: absolute;
  z-index: -1;
  bottom: -465px;
  left: 0;
  width: 100%;
  height: 518px;
  background: linear-gradient(178deg, #000 8.71%, #121212 54.61%, #121212 70.58%);
  filter: blur(10px);
}

/* 智能问答 */
.qa {
  position: relative;
  z-index: 1;
}

.qa h1 {
  margin-bottom: 160px;
}

.qa .qa-content {
  position: relative;
  z-index: 1;
  display: flex;
  justify-content: center;
}

.qa .qa-content img {
  max-width: 560px;
  width: 100%;
}

.qa .qa-content .phone-back {
  position: absolute;
  z-index: -2;
  top: 0;
  left: 50%;
  transform: translateX(-50%);
  max-width: 1308px;
  width: auto;
  height: 100%;
}

/* 智能存储 */
.storage h1 {
  margin-bottom: 66px;
}

.storage h4 {
  color: #fff;
  text-align: center;
  font-family: 'PingFang SC';
  font-size: 24px;
  font-style: normal;
  font-weight: 600;
  line-height: 34px;
  letter-spacing: 1.44px;
}

.storage-content div {
  display: flex;
  justify-content: center;
}

.storage-content div:nth-child(1) {
  gap: 554px;
  margin-bottom: 20px;
}

.storage-content div:nth-child(2) {
  position: relative;
  height: 914px;
}

.storage-content div:nth-child(2) img {
  position: absolute;
  height: 100%;
}

.storage-column-content {
  display: none;
}

@media (max-width: 1280px) {
  .storage-content {
    display: none;
  }

  .storage-column-content {
    display: flex;
    flex-direction: column;
    align-items: center;
    gap: 80px;
  }

  .storage-column-content h4 {
    margin-bottom: 20px;
  }

  .storage-column-content .phone {
    position: relative;
    z-index: 1;
  }

  .storage-column-content img {
    max-width: 560px;
    width: 100%;
    display: block;
  }

  .storage-column-content .phone-back {
    position: absolute;
    z-index: -2;
    top: 0;
    left: 50%;
    transform: translateX(-50%);
    max-width: 1200px;
    width: auto;
    height: 100%;
  }
}

/* 底部 */
.bottom {
  margin-bottom: 120px;
}

.bottom h1 {
  margin-bottom: 32px;
}

.bottom .downloads {
  margin-bottom: 135px;
}

/* 下载 */
.downloads {
  display: flex;
  align-items: flex-end;
  gap: 16px;
  margin: 0 auto;
  width: fit-content;
  height: 180px;
}

.downloads .btn {
  width: 150px;
  height: fit-content;
  border-radius: 4px;
  border: 1px solid #fff;
  background: rgba(255, 255, 255, 0.4);
  backdrop-filter: blur(10px);
  cursor: pointer;
}

.downloads .btn .content {
  display: flex;
  justify-content: center;
  align-items: center;
  gap: 8px;
  padding: 0 8px;
  height: 46px;
}

.downloads .btn svg {
  width: 28px;
  height: 28px;
}

.downloads .btn span {
  color: #fff;
  font-family: 'PingFang SC';
  font-size: 17px;
  font-style: normal;
  font-weight: 600;
  line-height: 24px;
  letter-spacing: 0;
  white-space: nowrap;
}

.downloads .btn .ios {
  color: #fff;
  font-family: 'PingFang SC';
  font-size: 10px;
  font-style: normal;
  font-weight: 400;
  line-height: normal;
  letter-spacing: -0.2px;
}

.downloads .btn .hover-content {
  height: 0;
  overflow: hidden;
}

.downloads .btn .hover-content img {
  width: 100%;
  aspect-ratio: 1/1;
}

.downloads .btn:hover .hover-content {
  padding: 17px 17px 0;
  height: fit-content;
}

/* 备案号 */
.filling {
  display: flex;
  justify-content: center;
  align-items: center;
  flex-wrap: wrap;
  gap: 12px;
  color: #fff;
  font-family: 'PingFang SC';
  font-size: 16px;
  font-style: normal;
  font-weight: 300;
  line-height: 22px;
}

.filling a {
  display: inline-flex;
  align-items: center;
  gap: 4px;
}

.filling a img {
  width: 16px;
  height: 16px;
}

@media (max-width: 640px) {
  section {
    margin-bottom: 60px;
    padding: 0 20px;
  }

  h1 {
    text-shadow: 0 0 9.868px rgba(0, 0, 0, 0.3);
    font-size: 24px;
    line-height: 32px;
    letter-spacing: 2.4px;
  }

  /* 首页面 */
  .first {
    margin-bottom: 100px;
    height: 211px;
    gap: 8px;
  }

  .first p {
    text-shadow: 0 0 9.868px rgba(0, 0, 0, 0.3);
    font-size: 10px;
    line-height: normal;
    letter-spacing: -0.4px;
    white-space: nowrap;
  }

  .first .downloads {
    z-index: 1;
    bottom: -32px;
  }

  .first::after {
    bottom: -107px;
    height: 107px;
  }

  /* 智能问答 */
  .qa h1 {
    margin-bottom: 60px;
  }

  .qa .qa-content img {
    max-width: 270px;
  }

  /* 智能存储 */
  .storage h1 {
    margin-bottom: 34px;
  }

  .storage h4 {
    font-size: 10px;
    line-height: normal;
    letter-spacing: 0;
  }

  .storage-column-content {
    gap: 32px;
  }

  .storage-column-content h4 {
    margin-bottom: 12px;
  }

  .storage-column-content img {
    max-width: 270px;
  }

  .storage-column-content .phone-back {
    max-width: 441px;
  }

  /* 底部 */
  .bottom {
    margin-bottom: 60px;
  }

  .bottom h1 {
    margin-bottom: 60px;
  }

  .bottom .downloads {
    margin-bottom: 88px;
  }

  /* 下载 */
  .downloads {
    gap: 12px;
    height: auto;
  }

  .downloads .btn {
    width: 100px;
    border-width: 0.5px;
  }

  .downloads .btn .content {
    height: 32px;
  }

  .downloads .btn svg {
    width: 16px;
    height: 16px;
  }

  .downloads .btn span {
    font-size: 12px;
    line-height: normal;
  }

  .downloads .btn .ios {
    font-size: 7px;
    letter-spacing: -0.14px;
  }

  .downloads .btn .hover-content,
  .downloads .btn:hover .hover-content {
    display: none;
  }

  /* 备案号 */
  .filling {
    gap: 8px;
    font-size: 10px;
    line-height: 14px;
  }

  .filling a img {
    width: 8px;
    height: 8px;
  }
}