body {
  margin: 0;
  font-family: 'Roboto', sans-serif;
  color: #6C757D;
  background-color: #FFFFFF;
  line-height: 1.6;
  overflow-x: hidden;
}
header {
  background-color: #007BFF;
  color: #FFFFFF;
  padding: 20px 10px;
  text-align: center;
  position: relative;
}
header::before {
  content: "这是一个网页样式设计参考";
  position: absolute;
  bottom: 10px;
  right: 10px;
  font-size: 12px;
  opacity: 0.8;
}
main {
  padding: 20px;
  display: flex;
  flex-direction: column;
  align-items: center;
}
.container {
  max-width: 1400px;
  width: 100%;
  margin: 0 auto;
  display: grid;
  grid-template-columns: repeat(auto-fit, minmax(300px, 1fr));
  gap: 20px;
}
.module {
  background-color: #28A745;
  color: #FFFFFF;
  padding: 15px;
  border-radius: 5px;
  text-align: center;
  transition: transform 0.3s ease-in-out, box-shadow 0.3s ease-in-out;
}
.module:hover {
  transform: translateY(-5px);
  box-shadow: 0 8px 15px rgba(0, 0, 0, 0.2);
}
.module img {
  width: 100%;
  height: auto;
  border-radius: 5px;
  margin-bottom: 10px;
}
.article-container {
  grid-column: span 2;
  background-color: #F8F9FA;
  color: #333;
  padding: 20px;
  border-radius: 5px;
  box-shadow: 0 4px 6px rgba(0, 0, 0, 0.1);
}
.article-container h2, .article-container h3 {
  color: #007BFF;
}
.chart {
  display: flex;
  justify-content: space-around;
  margin-top: 20px;
}
.chart div {
  width: 30px;
  background-color: #007BFF;
  transition: height 0.3s ease-in-out;
}
footer {
  background-color: #6C757D;
  color: #FFFFFF;
  text-align: center;
  padding: 10px 0;
  margin-top: 20px;
}
@media (max-width: 768px) {
  .container {
    grid-template-columns: 1fr;
  }
  .module {
    flex: 1 1 100%;
  }
  .article-container {
    grid-column: span 1;
  }
}
@media (min-width: 769px) and (max-width: 1024px) {
  .container {
    grid-template-columns: repeat(2, 1fr);
  }
}
@media (min-width: 1025px) and (max-width: 1200px) {
  .container {
    grid-template-columns: repeat(3, 1fr);
  }
}
@media (min-width: 1201px) {
  .container {
    grid-template-columns: repeat(4, 1fr);
  }
}