/* 全局样式设置 */
body {
  margin: 0;
  padding: 0;
  font-family: 'Helvetica', sans-serif;
  background: linear-gradient(135deg, #0D47A1 70%, #26C6DA 25%, #FFA726 5%);
  color: #FFFFFF;
  overflow-x: hidden; /* 防止左右滚动条 */
}

/* 固定导航栏样式 */
.navbar {
  position: fixed;
  top: 0;
  width: 100%;
  background-color: rgba(13, 71, 161, 0.9);
  display: flex;
  justify-content: space-around;
  padding: 15px 0;
  z-index: 1000;
}

/* 导航链接样式 */
.navbar a {
  color: #FFFFFF;
  text-decoration: none;
  font-size: 18px;
  transition: color 0.3s;
}

.navbar a:hover {
  color: #FFA726;
}

/* 主要内容容器 */
.container {
  display: grid;
  grid-template-columns: repeat(12, 1fr);
  grid-gap: 20px;
  padding: 100px 20px 20px 20px; /* 留出导航栏空间 */
}

/* 章节导航系统 */
.sidebar {
  grid-column: 1 / 3;
  background-color: rgba(0, 0, 0, 0.5);
  padding: 20px;
  border-radius: 8px;
}

.sidebar h3 {
  margin-top: 0;
  font-size: 20px;
  color: #FFA726;
}

.sidebar a {
  display: block;
  color: #FFFFFF;
  text-decoration: none;
  margin: 10px 0;
  transition: color 0.3s;
}

.sidebar a:hover {
  color: #26C6DA;
}

/* 文章内容样式 */
.article {
  grid-column: 3 / 13;
  background-color: rgba(255, 255, 255, 0.1);
  padding: 20px;
  border-radius: 8px;
  box-shadow: 0 4px 6px rgba(0, 0, 0, 0.3);
}

.article h2 {
  font-size: 24px;
  color: #FFA726;
  margin-bottom: 15px;
}

.article h3 {
  font-size: 20px;
  color: #26C6DA;
  margin-top: 20px;
}

.article p {
  font-size: 16px;
  line-height: 1.6;
  color: #FFFFFF;
}

/* 图片样式 */
.article img {
  width: 100%;
  max-width: 320px;
  border-radius: 10px;
  box-shadow: 0 4px 8px rgba(0, 0, 0, 0.2);
  transition: transform 0.3s, box-shadow 0.3s;
  margin: 10px 0;
}

.article img:hover {
  transform: scale(1.05);
  box-shadow: 0 8px 16px rgba(0, 0, 0, 0.3);
}

/* 分隔线样式 */
.separator {
  height: 2px;
  background: linear-gradient(90deg, #0D47A1, #26C6DA);
  margin: 30px 0;
  border: none;
}

/* CSS代码块样式 */
.code-block {
  background-color: rgba(0, 0, 0, 0.7);
  padding: 15px;
  border-radius: 8px;
  overflow-x: auto;
  margin: 20px 0;
}

.code-block code {
  color: #00E676;
  font-family: 'Courier New', Courier, monospace;
  font-size: 14px;
}

/* 按钮样式 */
.button {
  display: inline-block;
  padding: 10px 20px;
  background-color: #FFA726;
  color: #FFFFFF;
  text-decoration: none;
  border-radius: 5px;
  transition: background-color 0.3s;
}

.button:hover {
  background-color: #FB8C00;
}

/* 响应式设计 */
@media (max-width: 1200px) {
  .container {
    grid-template-columns: repeat(8, 1fr);
  }

  .sidebar {
    grid-column: 1 / 9;
  }

  .article {
    grid-column: 1 / 9;
  }
}

@media (max-width: 768px) {
  .container {
    grid-template-columns: repeat(4, 1fr);
  }

  .sidebar {
    grid-column: 1 / 5;
  }

  .article {
    grid-column: 1 / 5;
  }

  .navbar a {
    font-size: 16px;
  }

  .article h2 {
    font-size: 20px;
  }

  .article h3 {
    font-size: 18px;
  }

  .article p {
    font-size: 14px;
  }
}

/* 动画效果 */
@keyframes fadeIn {
  from { opacity: 0; }
  to { opacity: 1; }
}

.fade-in {
  animation: fadeIn 2s ease-in-out;
}

/* 提示信息样式 */
.reference-note {
  text-align: center;
  font-size: 18px;
  color: #FFFFFF;
  margin: 20px 0;
  font-weight: bold;
  background-color: rgba(255, 87, 34, 0.8);
  padding: 10px;
  border-radius: 5px;
}

/* 链接样式 */
a[rel="nofollow"] {
  color: #26C6DA;
  text-decoration: underline;
}

a[rel="nofollow"]:hover {
  color: #FFA726;
}

/* 高级排版 */
.article pre {
  background-color: rgba(0, 0, 0, 0.8);
  padding: 15px;
  border-radius: 8px;
  overflow-x: auto;
}

.article pre code {
  color: #00E676;
  font-family: 'Courier New', Courier, monospace;
  font-size: 14px;
}

/* 标题过渡效果 */
.article h2, .article h3 {
  transition: color 0.3s;
}

.article h2:hover, .article h3:hover {
  color: #FB8C00;
}

/* 装饰性元素 */
.decorative-line {
  width: 100%;
  height: 3px;
  background: linear-gradient(90deg, #0D47A1, #26C6DA, #FFA726);
  border: none;
  margin: 40px 0;
  border-radius: 2px;
}