html,
body {
  height: 100%;
  margin: 0;
  display: flex;
  flex-direction: column;
}

#content {
  flex: 1;
  display: flex;
  flex-direction: column;
}

body {
  font-family: "Arial", sans-serif;
  margin: 0;
  padding: 0;
  background-color: #f9f9f9;
  color: #444;
  line-height: 1.4;
}

header {
  background-color: #4caf50;
  color: white;
  padding: 10px 0;
  text-align: center;
  box-shadow: 0 2px 4px rgba(0, 0, 0, 0.1);
}

nav ul {
  list-style-type: none;
  padding: 0;
  margin: 0;
  display: flex;
  justify-content: center;
}

nav ul li {
  margin: 0 10px;
}

nav ul li a {
  color: white;
  text-decoration: none;
  font-size: 14px;
}

#hero {
  background-color: #e8f5e9;
  color: #333;
  text-align: center;
  padding: 20px 10px;
}

#hero h1 {
  margin: 0;
  font-size: 1.5em;
  font-weight: bold;
}

#hero p {
  font-size: 0.9em;
  margin-top: 5px;
}

.download-btn {
  display: inline-block;
  background-color: #4caf50;
  color: white;
  padding: 8px 16px;
  text-decoration: none;
  font-size: 12px;
  margin-top: 10px;
  margin-left: 4px;
  margin-right: 4px;
  border-radius: 4px;
  border: none;
}

.download-btn-more {
  display: inline-block;
  color: black;
  text-decoration: none;
  font-size: 14px;
  margin: 4px 0px;
}

#features,
#testimonial,
#download,
#popular-content,
#software-share {
  padding: 30px 20px;
  text-align: center;
}

.flex {
  display: flex;
  justify-content: center;
  align-items: center;
  flex-wrap: wrap;
}

#features img {
  max-width: 800px;
  border-radius: 8px;
  margin-bottom: 20px;
}

#features ul {
  list-style-type: none;
  padding: 0;
  margin: 0 auto;
  max-width: 600px;
  text-align: left;
}

#features ul li {
  font-size: 12px;
  margin: 5px 0;
  line-height: 1.4;
  background: #fff;
  padding: 10px;
  border-radius: 4px;
  box-shadow: 0 1px 3px rgba(0, 0, 0, 0.1);
  font-size: 14px;
}

.features-list-box {
  box-sizing: border-box;
  padding: 0px 20px;
  max-width: 600px;
}

.software-box {
  display: flex;
  flex-direction: column;
  border: 1px solid #4caf50;
  text-align: left;
  box-sizing: border-box;
  padding: 10px;
  width: 300px;
  height: 300px;
  /* 限制高度 */
  overflow-y: auto;
  /* 垂直滚动条 */
}

.software-box-header {
  display: flex;
  flex-direction: column;
  text-align: left;
  box-sizing: border-box;
}

.software-box h3 {
  margin-bottom: 10px;
  font-size: 16px;
  font-weight: bold;
}

.software-box a::before {
  content: "⬇";
  /* 下载图标 */
  margin-right: 8px;
  color: #4caf50;
}

#software-share .software-grid {
  display: grid;
  grid-template-columns: repeat(auto-fit, minmax(200px, 1fr));
  gap: 15px;
  justify-items: center;
  box-sizing: border-box;
  padding: 40px 20px;
}

#software-share .software-item {
  display: flex;
  align-items: center;
  justify-content: center;
  cursor: pointer;
  margin: 5px 0;
}

#software-share .software-item img {
  max-width: 100%;
  border-radius: 4px;
}

footer {
  background-color: #333;
  color: white;
  text-align: center;
  padding: 5px;
  font-size: 10px;
}

footer ul {
  list-style-type: none;
  padding: 0;
  margin: 0;
}

footer ul li {
  display: inline;
  margin: 0 10px;
}

footer ul li a {
  color: white;
  text-decoration: none;
}

#software-img {
  width: 100px;
  height: 100px;
  border-radius: 50%;
}

#software-share-container {
  display: flex;
  justify-content: center;
  align-items: initial;
  flex-wrap: wrap;
  gap: 20px;
}

@media screen and (max-width: 768px) {
  #hero h1 {
    font-size: 1.2em;
  }

  #hero p {
    font-size: 0.8em;
  }

  .download-btn {
    padding: 6px 12px;
    font-size: 10px;
  }

  #features img {
    margin-bottom: 15px;
  }

  #features ul li {
    font-size: 10px;
  }

  #software-share .software-item h3 {
    font-size: 14px;
  }

  #software-share .software-item p {
    font-size: 12px;
  }
}