.sthz-main {
  background: url("../img/sthz_bg.png") no-repeat center center;
  background-size: cover;
}

body.page-about-sub {
  --about-h5-bg-image: url("../img/h5/sthz_bg.png");
}

.sthz-main .page-wrap {
  padding: 46px 32px 0;
  display: flex;
  flex-direction: column;
  align-items: center;
  height: 100%;
  box-sizing: border-box;
  position: relative;
  overflow: hidden;
}

.sthz-main .page-content {
  width: 100%;
  max-width: 1200px;
  margin-left: auto;
  margin-right: auto;
  flex: 1;
  min-height: 0;
  overflow-x: hidden;
  overflow-y: auto;
  scrollbar-width: none;
  -ms-overflow-style: none;
}

.sthz-main .page-content::-webkit-scrollbar {
  display: none;
}

/* 横幅：设计 1172×309，圆角 10px；描述固定在底部蒙版区，不遮挡上方画面 */
.sthz-banner {
  position: relative;
  width: 1172px;
  max-width: 100%;
  height: 309px;
  margin-left: auto;
  margin-right: auto;
  border-radius: 10px;
  flex-shrink: 0;
  overflow: hidden;
}

.sthz-banner-img {
  position: absolute;
  inset: 0;
  z-index: 0;
  width: 100%;
  height: 100%;
  display: block;
  object-fit: cover;
  object-position: center top;
  border-radius: 10px;
}

.sthz-desc-box {
  position: absolute;
  left: 0;
  right: 0;
  bottom: 0;
  z-index: 1;
  display: flex;
  flex-direction: column;
  justify-content: flex-end;
  width: 100%;
  max-height: 52%;
  min-height: 120px;
  border-radius: 0 0 10px 10px;
  background: linear-gradient(180deg, rgba(0, 0, 0, 0) 0%, rgba(10, 5, 11, 0.72) 42%, #0A050B 100%);
  box-sizing: border-box;
  overflow: hidden;
  pointer-events: none;
}

.sthz-desc {
  width: 100%;
  max-width: 1060px;
  margin: 0 auto;
  padding: 0 20px 16px 56px;
  box-sizing: border-box;
  font-size: 13px;
  font-weight: 400;
  line-height: 22px;
  color: #C8CED6;
}

/* 合作伙伴：设计 1104×217 */
.sthz-partners {
  width: 1104px;
  max-width: 100%;
  height: auto;
  aspect-ratio: 1104 / 217;
  margin: 34px auto 0;
  flex-shrink: 0;
}

.sthz-partners img {
  width: 100%;
  height: 100%;
  display: block;
  object-fit: contain;
  object-position: center;
}

.sthz-partners .sthz-h5-only {
  display: none;
}

.sthz-h5-only {
  display: none;
}

@media (min-width: 993px) {
  .sthz-main .page-wrap {
    padding-top: clamp(24px, 3vh, 46px);
  }

  .sthz-main .page-content {
    display: flex;
    flex-direction: column;
    align-items: center;
    justify-content: flex-start;
    /* 136 = 底部五块导航 88 + bottom 24 + 间距 24 */
    padding-bottom: 136px;
    box-sizing: border-box;
  }

  /* 一屏可用高度：视口 - 头脚 - 顶距 - 底栏预留 - 区块间距 */
  .sthz-banner {
    width: min(1172px, 100%);
    height: auto;
    max-height: min(309px, calc((100vh - var(--pc-header-height) - var(--pc-footer-height) - clamp(24px, 3vh, 46px) - 136px - 20px) * 0.56));
    aspect-ratio: 1172 / 309;
    flex-shrink: 1;
    min-height: 0;
  }

  .sthz-desc-box {
    max-height: 52%;
    min-height: 88px;
  }

  .sthz-desc {
    padding: 0 20px clamp(10px, 1.5vh, 16px);
    font-size: clamp(11px, 1.1vw, 13px);
    line-height: clamp(18px, 2vh, 22px);
  }

  .sthz-partners {
    width: min(1104px, 100%);
    max-height: min(217px, calc((100vh - var(--pc-header-height) - var(--pc-footer-height) - clamp(24px, 3vh, 46px) - 136px - 20px) * 0.38));
    margin: clamp(12px, 1.5vh, 34px) auto 0;
    flex-shrink: 1;
    min-height: 0;
  }
}

@media (min-width: 993px) and (max-width: 1500px) {
  .sthz-desc {
    padding-left: 20px;
    padding-right: 20px;
  }
}

@media (min-width: 993px) and (max-height: 820px) {
  .sthz-main .page-wrap {
    padding-top: 20px;
  }

  .sthz-banner {
    max-height: min(260px, calc((100vh - var(--pc-header-height) - var(--pc-footer-height) - 20px - 136px - 16px) * 0.54));
  }

  .sthz-partners {
    max-height: min(180px, calc((100vh - var(--pc-header-height) - var(--pc-footer-height) - 20px - 136px - 16px) * 0.36));
    margin-top: 12px;
  }

  .sthz-desc-box {
    min-height: 80px;
    max-height: 55%;
  }

  .sthz-desc {
    padding-bottom: 10px;
    font-size: 11px;
    line-height: 17px;
  }
}