/* 基本样式设置 */
body {
  margin: 0;
  padding: 0;
  font-family: 'Open Sans', sans-serif; /* 主要字体 */
  background: linear-gradient(135deg, #212B35 70%, #4CAF50 25%, #FF9800 5%); /* 背景渐变色 */
  color: #212B35; /* 主文字颜色 */
  line-height: 1.6;
  transition: background 0.5s ease;
}

/* 导航栏样式 */
.navbar {
  display: flex;
  justify-content: space-around;
  align-items: center;
  background-color: #212B35; /* 主色调 */
  padding: 1em 0;
  position: fixed;
  top: 0;
  width: 100%;
  box-shadow: 0 2px 4px rgba(0,0,0,0.1);
  z-index: 1000;
}

.navbar a {
  color: #F5F7FA; /* 导航文字颜色 */
  text-decoration: none;
  padding: 0.5em 1em;
  transition: background-color 0.3s, color 0.3s;
}

.navbar a:hover {
  background-color: #4CAF50; /* 辅助色 */
  color: #FFFFFF;
  border-radius: 4px;
}

/* 主容器样式 */
.container {
  display: flex;
  flex-wrap: wrap;
  padding: 6em 2em 2em 2em; /* 顶部留出导航栏空间 */
  max-width: 1200px;
  margin: 0 auto;
}

/* 侧边栏样式 */
.sidebar {
  flex: 1 1 200px;
  background-color: #F5F7FA; /* 辅色调 */
  padding: 1em;
  margin-right: 2em;
  border-radius: 8px;
  box-shadow: 0 4px 6px rgba(0,0,0,0.1);
}

.sidebar a {
  display: block;
  margin-bottom: 1em;
  color: #212B35;
  text-decoration: none;
  padding: 0.5em;
  border-radius: 4px;
  transition: background-color 0.3s;
}

.sidebar a:hover {
  background-color: #4CAF50;
  color: #FFFFFF;
}

/* 内容区域样式 */
.content {
  flex: 3 1 600px;
  background-color: #FFFFFF;
  padding: 2em;
  border-radius: 8px;
  box-shadow: 0 4px 6px rgba(0,0,0,0.1);
  color: #212B35;
}

/* 图片装饰样式 */
img.decorative {
  width: 100%;
  border-radius: 8px;
  box-shadow: 0 4px 6px rgba(0,0,0,0.1);
  transition: transform 0.3s, box-shadow 0.3s;
  margin: 1em 0;
}

img.decorative:hover {
  transform: scale(1.05);
  box-shadow: 0 8px 12px rgba(0,0,0,0.2);
}

/* 代码块样式 */
pre code {
  display: block;
  padding: 1em;
  background-color: #212B35;
  color: #F5F7FA;
  border-radius: 8px;
  overflow-x: auto;
  font-family: 'Courier New', Courier, monospace;
  margin: 1em 0;
}

/* 按钮样式 */
.button {
  background-color: #4CAF50;
  color: #FFFFFF;
  padding: 0.75em 1.5em;
  border: none;
  border-radius: 4px;
  cursor: pointer;
  transition: background-color 0.3s, transform 0.3s;
  display: inline-block;
  text-decoration: none;
}

.button:hover {
  background-color: #FF9800;
  transform: translateY(-2px);
}

/* 标题样式 */
h2, h3, h4 {
  color: #212B35;
}

h2 {
  font-size: 2em;
  margin-bottom: 0.5em;
}

h3 {
  font-size: 1.75em;
  margin-bottom: 0.5em;
}

h4 {
  font-size: 1.5em;
  margin-bottom: 0.5em;
}

/* 段落样式 */
p {
  margin-bottom: 1em;
  font-size: 1em;
}

/* 代码示例样式 */
.code-sample {
  background-color: #F5F7FA;
  padding: 1em;
  border-left: 4px solid #4CAF50;
  margin: 1em 0;
  font-family: 'Courier New', Courier, monospace;
  overflow-x: auto;
}

/* 表格样式 */
table {
  width: 100%;
  border-collapse: collapse;
  margin: 1em 0;
}

thead {
  background-color: #212B35;
  color: #F5F7FA;
}

th, td {
  padding: 1em;
  text-align: left;
  border-bottom: 1px solid #ddd;
}

tbody tr:nth-child(even) {
  background-color: #F5F7FA;
}

tbody tr:hover {
  background-color: #E0E0E0;
}

/* 动态粒子背景样式 */
.particle-background {
  position: fixed;
  width: 100%;
  height: 100%;
  background: #212B35;
  overflow: hidden;
  z-index: -1;
}

.particle {
  position: absolute;
  width: 2px;
  height: 2px;
  background: #4CAF50;
  border-radius: 50%;
  animation: move 10s infinite linear;
}

@keyframes move {
  from {
    transform: translateY(0) translateX(0);
  }
  to {
    transform: translateY(-1000px) translateX(1000px);
  }
}

.particle:hover {
  background: #FF9800;
  transform: scale(2);
}

/* 提示文字样式 */
.reference-note {
  font-size: 1.5em;
  font-weight: bold;
  text-align: center;
  margin: 2em 0;
  color: #FF9800; /* 点缀色 */
}

/* 响应式设计 */
@media (max-width: 768px) {
  .container {
    flex-direction: column;
    padding: 2em 1em;
  }

  .sidebar {
    width: 100%;
    margin-right: 0;
    margin-bottom: 2em;
  }

  .content {
    padding: 1em;
  }
}

/* 折叠区域样式 */
.collapsible {
  background-color: #4CAF50;
  color: white;
  cursor: pointer;
  padding: 0.75em 1em;
  width: 100%;
  border: none;
  text-align: left;
  outline: none;
  font-size: 1em;
  border-radius: 4px;
  transition: background-color 0.3s;
  margin: 1em 0;
}

.collapsible:hover {
  background-color: #FF9800;
}

.collapsible.active, .collapsible:focus {
  background-color: #FF9800;
}

.content-collapsible {
  padding: 0 1em;
  display: none;
  overflow: hidden;
  background-color: #F5F7FA;
  border-radius: 4px;
}

/* 优化导航栏宽度 */
.navbar {
  box-sizing: border-box;
}