* {
  margin: 0;
  padding: 0;
}

li {
  list-style: none;
}
a {
  text-decoration: none;
}

.h-center {
  max-width: 1056px;
  margin: 0 auto;
}

.top-level {
  height: 50vh;
  margin-top: 60px;
  position: relative;
}

.top-level .front-end {
  position: absolute;
  width: 100%;
  left: 0;
  top: 0;
}

.top-level header {
  display: flex;
  align-items: center;
  height: 60px;
  border-bottom: 1px solid #c0c0c0;
  justify-content: space-between;
  padding: 0 20px;
  position: fixed;
  top: 0;
  left: 0;
  width: calc(100% - 40px);
  background-color: #fff;
  z-index: 1;
  font-size: 14px;
}

.top-level header a {
  color: #333;
  margin: 0 10px;
  font-size: 14px;
}

.top-level .title {
  font-size: 18px;
  display: flex;
  align-items: center;
  font-weight: bold;
}
.top-level .title img {
  width: 30px;
  margin-right: 10px;
}

.top-level .logo {
  width: 120px;
  margin-top: 10vh;
  margin-bottom: 40px;
}

.top-level .content {
  text-align: center;
  font-size: 16px;
  font-weight: bold;
}

.top-level .download {
  display: flex;
  align-items: center;
  justify-content: center;
  width: 200px;
  border: 1px solid #d33332;
  margin: 30px auto 0 auto;
  height: 40px;
  line-height: 40px;
  background-color: #d33332;
  color: #fff;
  border-radius: 4px;
  font-size: 14px;
  font-weight: normal;
}

.top-level .download img {
  width: 24px;
  position: relative;
  left: -10px;
}

.desc-block {
  padding: 60px 0;
}

.desc-block:nth-child(2n) {
  background-color: #f1f2f5;
}

.container {
  display: flex;
}

.container .desc {
  padding: 0 20px;
  flex: 1
}
.container .desc .notice {
  font-size: 12px;
  color: #666;
}
.container .desc p {
  margin-top: 10px;
  line-height: 1.5;
  font-size: 16px;
}
.container .img-box {
  overflow: hidden;
  border-radius: 6px;
  box-shadow: 2px 2px 10px 0 #c0c0c0;
  flex: 1;
}
.container .img-box img {
  width: 100%;
  transform: scale(1.02) translateY(3px);
}


/* footer */

.footer {
  text-align: center;
  height: 80px;
  border-top: 1px solid #ccc;
  position: relative;
}

.footer a {
  font-size: 14px;
  color: #999;
  position: absolute;
  top: 50%;
  left: 50%;
  transform: translate(-50%, -50%);
}