:root {
  --sung-download-pt: 90px;
  --sung-download-pb: 100px;
  --sung-download-title-size: 40px;
  --sung-download-text-size: 18px;
}
.sul-tit{
  background: url(https://okki-shop.oss-cn-hangzhou.aliyuncs.com/category/369524/2400/b597d59b7d67b2507d09f7668b311efe/%E5%9B%BE%E5%B1%82%2012.png) no-repeat left;
  display: block;
  padding: 0 0 0 37px;
  position: relative;
}
.h1{
  margin-bottom:50px;
  color: var(--color-second);
   
}
.sung-download.main {
  padding-top: var(--sung-download-pt);
  padding-bottom: var(--sung-download-pb);
}

.sung-download .down-list {
  margin-bottom: 70px;
}

.sung-download .down-list h3 {
  margin-bottom: 40px;
  font-size: var(--sung-download-title-size);
  font-style: normal;
  font-weight: 900;
  line-height: 1.3;
  color: var(--title-text-color);
}

.sung-download .down-list ul li {
  width: 25%;
  padding: 15px 20px;
}

.sung-download .down-list ul li a {
  display: flex;
  justify-content: space-between;
  align-items: center;
  width: 100%;
  border: 1px solid #ddd;
  border-bottom: 2px solid var(--color-primary);
  color: var(--text-color);
  height: 64px;
  padding: 20px;
  cursor: pointer;
}

.sung-download .down-list ul li a span {
  font-size: var(--sung-download-text-size);
  display: block;
  text-overflow: ellipsis;
  white-space: nowrap;
  overflow: hidden;
  transition: background-color 0.3s ease;
}

.sung-download .down-list ul li a:hover {
  background-color: var(--color-primary);
  color: #fff;
}

.sung-download .down-list ul li a:checked {
  background: linear-gradient(0deg,
      rgba(0, 0, 0, 0.2) 0%,
      rgba(0, 0, 0, 0.2) 100%),
    var(--color-primary);
  color: #fff;
}

@media screen and (max-width: 1500px) {
  :root {
    --sung-download-pt: 80px;
    --sung-download-pb: 90px;
    --sung-download-title-size: 36px;
    --sung-download-text-size: 18px;
  }
}

@media screen and (max-width: 1280px) {
  :root {
    --sung-download-pt: 70px;
    --sung-download-pb: 80px;
    --sung-download-title-size: 32px;
    --sung-download-text-size: 16px;
  }
}

@media screen and (max-width: 1200px) {
  :root {
    --sung-download-pt: 60px;
    --sung-download-pb: 70px;
    --sung-download-title-size: 28px;
    --sung-download-text-size: 16px;
  }
}

@media screen and (max-width: 992px) {
  :root {
    --sung-download-pt: 50px;
    --sung-download-pb: 60px;
    --sung-download-title-size: 24px;
    --sung-download-text-size: 16px;
  }

  .sung-download .down-list {
    margin-bottom: 45px;
  }

  .sung-download .down-list h3 {
    padding-bottom: 20px;
  }

  .sung-download .down-list ul li a {
    height: 55px;
  }
}

@media screen and (max-width: 768px) {
  :root {
    --sung-download-pt: 40px;
    --sung-download-pb: 50px;
    --sung-download-title-size: 20px;
    --sung-download-text-size: 14px;
  }

  .sung-download .down-list {
    margin-bottom: 30px;
  }

  .sung-download .down-list h3 {
    padding-bottom: 15px;
  }
}

@media screen and (max-width: 576px) {
  :root {
    --sung-download-pt: 30px;
    --sung-download-pb: 40px;
    --sung-download-title-size: 20px;
    --sung-download-text-size: 14px;
  }
}