/* 全局样式设置，包括字体、背景色、颜色变量 */
:root {
  --primary-color: #203a43; /* 主色调：深蓝色 */
  --secondary-color: #2c5364; /* 辅色调：深灰色 */
  --accent-color: #00d1ff; /* 点缀色：电蓝色 */
  --background-gradient: linear-gradient(135deg, #0f2027, #203a43, #2c5364); /* 背景渐变 */
}

/* 设置全局字体与背景 */
body {
  margin: 0;
  padding: 0;
  font-family: 'Montserrat', sans-serif;
  background: var(--background-gradient);
  color: #ffffff;
  line-height: 1.6;
  transition: background 0.5s ease, color 0.5s ease;
}

/* 固定导航栏样式 */
.navbar {
  position: fixed;
  top: 0;
  width: 100%;
  background-color: var(--primary-color);
  display: flex;
  justify-content: space-between;
  align-items: center;
  padding: 15px 30px;
  box-shadow: 0 2px 4px rgba(0, 0, 0, 0.5);
  z-index: 1000;
}

/* 导航链接样式 */
.navbar a {
  color: var(--accent-color);
  text-decoration: none;
  margin: 0 15px;
  font-size: 16px;
  transition: color 0.3s ease;
}
.navbar a:hover {
  color: #ff4081;
}

/* 主内容容器，使用Grid布局 */
.container {
  display: grid;
  grid-template-columns: 1fr;
  grid-gap: 20px;
  padding: 100px 20px 20px 20px; /* 顶部留出导航栏空间 */
  max-width: 1200px;
  margin: 0 auto;
}

/* 文章样式 */
article {
  background-color: rgba(44, 44, 44, 0.8);
  padding: 20px;
  border-radius: 10px;
  box-shadow: 0 4px 6px rgba(0,0,0,0.3);
  transition: box-shadow 0.3s ease;
}
article:hover {
  box-shadow: 0 8px 12px rgba(0,0,0,0.5);
}

/* 标题样式 */
h2, h3, h4 {
  color: var(--accent-color);
  margin-bottom: 15px;
}
h2 {
  font-size: 24px;
}
h3 {
  font-size: 20px;
}
h4 {
  font-size: 18px;
}

/* 段落样式 */
p {
  font-size: 16px;
  color: #e0e0e0;
  margin-bottom: 15px;
}

/* 代码块样式 */
pre {
  background-color: #1e1e1e;
  padding: 15px;
  border-radius: 5px;
  overflow-x: auto;
  margin-bottom: 15px;
}
pre code {
  color: #00d1ff;
  font-family: 'Courier New', Courier, monospace;
}

/* 表格样式 */
table {
  width: 100%;
  border-collapse: collapse;
  margin-bottom: 15px;
}
table th, table td {
  border: 1px solid #555;
  padding: 10px;
  text-align: left;
}
table th {
  background-color: var(--secondary-color);
}
table td {
  background-color: rgba(44, 44, 44, 0.8);
}

/* 图片样式 */
img {
  width: 100%;
  max-width: 320px;
  border-radius: 10px;
  box-shadow: 0 4px 6px rgba(0,0,0,0.3);
  transition: transform 0.3s ease, box-shadow 0.3s ease;
}
img:hover {
  transform: scale(1.05);
  box-shadow: 0 8px 12px rgba(0,0,0,0.5);
}

/* 按钮样式 */
.button {
  background-color: var(--accent-color);
  color: #1e1e1e;
  padding: 10px 20px;
  border: none;
  border-radius: 5px;
  cursor: pointer;
  transition: box-shadow 0.3s ease, transform 0.3s ease;
}
.button:hover {
  box-shadow: 0 4px 8px rgba(0, 0, 0, 0.3);
  transform: translateY(-2px);
}

/* 折叠区域样式 */
.collapsible {
  background-color: var(--secondary-color);
  color: #ffffff;
  cursor: pointer;
  padding: 10px;
  width: 100%;
  border: none;
  text-align: left;
  outline: none;
  font-size: 16px;
  border-radius: 5px;
  margin-bottom: 10px;
}
.active, .collapsible:hover {
  background-color: var(--accent-color);
}
.content {
  padding: 0 15px;
  display: none;
  overflow: hidden;
  background-color: rgba(44, 44, 44, 0.8);
  border-radius: 5px;
  margin-bottom: 15px;
}
/* 导航章节链接样式 */
.chapter-nav {
  position: fixed;
  right: 20px;
  top: 100px;
  background-color: rgba(32, 58, 67, 0.9);
  padding: 10px;
  border-radius: 5px;
}
.chapter-nav a {
  display: block;
  color: var(--accent-color);
  text-decoration: none;
  margin: 5px 0;
  font-size: 14px;
  transition: color 0.3s ease;
}
.chapter-nav a:hover {
  color: #ff4081;
}

/* 动画示例 */
@keyframes pulse {
  0% {
    transform: scale(1);
    opacity: 0.7;
  }
  50% {
    transform: scale(1.2);
    opacity: 0.4;
  }
  100% {
    transform: scale(1);
    opacity: 0.7;
  }
}
.neon-effect {
  background: radial-gradient(circle, #00d1ff, #ff4081);
  border-radius: 50%;
  filter: blur(50px);
  animation: pulse 5s infinite;
}

/* 响应式设计 */
@media (min-width: 768px) {
  .container {
    grid-template-columns: 2fr 1fr;
  }
}
@media (max-width: 480px) {
  .navbar {
    flex-direction: column;
    align-items: flex-start;
  }
  .chapter-nav {
    position: static;
    margin-top: 20px;
  }
}