body {
  font-family: 'Roboto', sans-serif;
  margin: 0;
  padding: 0;
  background: #f8f9fa;
  color: #212529;
  line-height: 1.6;
  overflow-x: hidden;
}
.container {
  max-width: 1440px;
  margin: 0 auto;
  padding: 20px;
  display: grid;
  grid-template-columns: repeat(auto-fit, minmax(300px, 1fr));
  gap: 20px;
}
.header {
  grid-column: span 3;
  text-align: center;
  padding: 40px 20px;
  background: linear-gradient(135deg, #0d6efd, #ffc107);
  color: white;
  font-size: 2rem;
  font-weight: bold;
  position: relative;
}
.header::after {
  content: '这是一个网页样式设计参考';
  position: absolute;
  bottom: 10px;
  right: 20px;
  font-size: 0.8rem;
  opacity: 0.8;
}
.card {
  background: white;
  border-radius: 10px;
  box-shadow: 0 2px 5px rgba(0, 0, 0, 0.1);
  transition: all 0.3s ease;
  padding: 20px;
  overflow: hidden;
}
.card:hover {
  transform: translateY(-5px);
  box-shadow: 0 4px 8px rgba(0, 0, 0, 0.2);
}
.card img {
  width: 100%;
  height: auto;
  border-radius: 10px;
  margin-bottom: 15px;
}
.grid-item {
  background: #ffffff;
  border: 1px solid #ddd;
  border-radius: 10px;
  padding: 15px;
  text-align: center;
}
.grid-item img {
  width: 100%;
  height: auto;
  border-radius: 10px;
  margin-bottom: 10px;
}
.grid-item h3 {
  font-size: 1.2rem;
  margin-bottom: 10px;
}
.grid-item p {
  font-size: 0.9rem;
  color: #555;
}
@media (max-width: 768px) {
  .container {
    grid-template-columns: 1fr;
  }
  .header {
    grid-column: span 1;
  }
}
.highlight {
  background: linear-gradient(135deg, #0d6efd, #ffc107);
  color: white;
  padding: 10px;
  border-radius: 5px;
  margin: 10px 0;
}
.article-container {
  grid-column: span 3;
  background: white;
  padding: 30px;
  border-radius: 10px;
  box-shadow: 0 2px 5px rgba(0, 0, 0, 0.1);
}
.article-container h2 {
  font-size: 2rem;
  margin-bottom: 20px;
  color: #0d6efd;
}
.article-container h3 {
  font-size: 1.5rem;
  margin-top: 20px;
  margin-bottom: 10px;
  color: #333;
}
.article-container pre {
  background: #f4f4f4;
  padding: 15px;
  border-radius: 5px;
  overflow-x: auto;
  font-size: 0.9rem;
}
.article-container blockquote {
  background: #f9f9f9;
  padding: 15px;
  border-left: 5px solid #0d6efd;
  margin: 20px 0;
  font-style: italic;
  color: #555;
}
.article-container ol {
  padding-left: 20px;
  margin-top: 10px;
}
.article-container li {
  margin-bottom: 5px;
  color: #444;
}
.footer {
  grid-column: span 3;
  text-align: center;
  padding: 20px;
  background: #0d6efd;
  color: white;
  font-size: 0.9rem;
}