/* 全局样式设置 */
body {
  margin: 0;
  padding: 0;
  background: linear-gradient(135deg, #F5F5F5 70%, #1E90FF 25%, #FFA500 5%);
  font-family: 'Roboto', sans-serif;
  color: #333;
  line-height: 1.6;
}

/* 响应式容器 */
.container {
  max-width: 1200px;
  margin: 0 auto;
  padding: 20px;
}

/* 导航栏样式 */
.navbar {
  position: fixed;
  top: 0;
  width: 100%;
  background-color: rgba(255, 255, 255, 0.9);
  box-shadow: 0 2px 4px rgba(0,0,0,0.1);
  z-index: 1000;
}

.navbar .container {
  display: flex;
  justify-content: space-between;
  align-items: center;
}

.navbar .logo {
  font-size: 1.5em;
  font-weight: bold;
  color: #1E90FF;
}

.navbar ul {
  list-style: none;
  display: flex;
  margin: 0;
  padding: 0;
}

.navbar ul li {
  margin-left: 20px;
}

.navbar ul li a {
  text-decoration: none;
  color: #333;
  font-weight: 500;
  transition: color 0.3s ease;
}

.navbar ul li a:hover {
  color: #FFA500;
}

/* 汉堡菜单样式 */
.hamburger {
  display: none;
  flex-direction: column;
  cursor: pointer;
}

.hamburger div {
  width: 25px;
  height: 3px;
  background-color: #333;
  margin: 4px 0;
  transition: all 0.3s ease;
}

@media (max-width: 768px) {
  .navbar ul {
    display: none;
    flex-direction: column;
    width: 100%;
    background-color: rgba(255, 255, 255, 0.95);
    position: absolute;
    top: 60px;
    left: 0;
    box-shadow: 0 2px 4px rgba(0,0,0,0.1);
  }

  .navbar ul.active {
    display: flex;
  }

  .hamburger {
    display: flex;
  }
}

/* 主要内容区域 */
.main {
  margin-top: 80px;
}

/* 章节导航 */
.sidebar {
  position: fixed;
  top: 80px;
  left: 0;
  width: 200px;
  padding: 20px;
}

.sidebar ul {
  list-style: none;
  padding: 0;
}

.sidebar ul li {
  margin-bottom: 10px;
}

.sidebar ul li a {
  text-decoration: none;
  color: #1E90FF;
  transition: color 0.3s ease;
}

.sidebar ul li a:hover {
  color: #FFA500;
}

@media (max-width: 992px) {
  .sidebar {
    display: none;
  }
}

/* 文章内容 */
article {
  display: flex;
  flex-direction: column;
}

article h2, article h3, article h4 {
  color: #1E90FF;
}

article p {
  font-size: 16px;
  margin-bottom: 20px;
}

article pre {
  background: #f0f8ff;
  padding: 15px;
  border-radius: 5px;
  overflow-x: auto;
}

article code {
  font-family: 'Courier New', Courier, monospace;
  color: #333;
}

/* 图片样式 */
img.decorative {
  width: 100%;
  max-width: 320px;
  border-radius: 10px;
  box-shadow: 0 4px 6px rgba(0,0,0,0.1);
  margin: 20px 0;
  transition: transform 0.3s ease, box-shadow 0.3s ease;
}

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

/* 提示文字样式 */
.reference {
  background-color: rgba(30, 144, 255, 0.1);
  padding: 15px;
  border-left: 5px solid #1E90FF;
  margin: 20px 0;
  font-size: 18px;
  font-weight: bold;
}

/* 代码示例样式 */
.code-example {
  background: #333;
  color: #f8f8f2;
  padding: 20px;
  border-radius: 5px;
  overflow-x: auto;
  font-family: 'Source Code Pro', monospace;
  margin-bottom: 20px;
}

.code-example .language-css {
  color: #f8f8f2;
}

/* 按钮样式 */
.button {
  display: inline-block;
  background: linear-gradient(45deg, #1E90FF, #FFA500);
  color: #fff;
  padding: 10px 20px;
  border: none;
  border-radius: 25px;
  cursor: pointer;
  transition: background 0.3s ease, transform 0.3s ease;
  text-decoration: none;
}

.button:hover {
  background: linear-gradient(45deg, #FFA500, #1E90FF);
  transform: scale(1.05);
}

/* 加载动画 */
.loader {
  border: 8px solid #f3f3f3;
  border-top: 8px solid #1E90FF;
  border-radius: 50%;
  width: 60px;
  height: 60px;
  animation: spin 1s linear infinite;
  margin: 20px auto;
}

@keyframes spin {
  0% { transform: rotate(0deg); }
  100% { transform: rotate(360deg); }
}

/* 过渡效果 */
.transition-element {
  background-color: #fff;
  transition: background-color 0.5s ease, transform 0.5s ease;
}

.transition-element:hover {
  background-color: #f0f8ff;
  transform: scale(1.1);
}

/* 章节之间的分隔 */
.section {
  padding: 60px 20px;
}

.section + .section {
  border-top: 1px solid #ddd;
}

/* 底部样式 */
.footer {
  background-color: rgba(255, 255, 255, 0.9);
  padding: 20px;
  text-align: center;
  color: #666;
  margin-top: 40px;
}

/* 链接样式 */
a {
  color: #1E90FF;
  text-decoration: none;
}

a:hover {
  color: #FFA500;
}

/* 折叠区域样式 */
.collapsible {
  background-color: #1E90FF;
  color: white;
  cursor: pointer;
  padding: 10px;
  width: 100%;
  border: none;
  text-align: left;
  outline: none;
  font-size: 16px;
  margin-bottom: 10px;
}

.active, .collapsible:hover {
  background-color: #FFA500;
}

.content {
  padding: 0 18px;
  display: none;
  overflow: hidden;
  background-color: #f1f1f1;
}

/* 样式示例代码块 */
.code-sample {
  background-color: #282c34;
  color: #abb2bf;
  padding: 15px;
  border-radius: 5px;
  font-family: 'Courier New', Courier, monospace;
  overflow-x: auto;
}

.code-sample code {
  display: block;
}