/* 
整体页面样式设置，确保响应式设计及美观统一。
主色调为深蓝色，辅色为浅灰色，点缀色为橙色，背景色非白色以增强视觉效果。
使用Flexbox和Grid布局实现各个部分的灵活排列，保证在不同设备上的良好显示。
*/

:root {
  --primary-color: #0D47A1; /* 深蓝色作为主色 */
  --secondary-color: #B0BEC5; /* 浅灰色作为辅色 */
  --accent-color: #FF6F00; /* 橙色作为点缀色 */
  --background-color: #F5F5F5; /* 淡灰色背景，避免纯白 */
  --font-family: 'Roboto', sans-serif; /* 使用Roboto字体 */
  --font-size-base: 16px; /* 基础字体大小 */
}

* {
  margin: 0;
  padding: 0;
  box-sizing: border-box;
}

/* 页面整体布局 */
body {
  font-family: var(--font-family);
  font-size: var(--font-size-base);
  background-color: var(--background-color);
  color: #333;
}

/* 导航栏样式 */
.navbar {
  position: fixed;
  top: 0;
  width: 100%;
  background-color: var(--primary-color);
  color: #fff;
  display: flex;
  justify-content: space-between;
  align-items: center;
  padding: 20px 40px;
  box-shadow: 0 2px 4px rgba(0, 0, 0, 0.1);
  z-index: 1000;
}

.navbar a {
  color: #fff;
  text-decoration: none;
  margin: 0 15px;
  font-size: 18px;
  transition: color 0.3s ease;
}

.navbar a:hover {
  color: var(--accent-color);
}

/* 背景插画样式 */
.background-illustration {
  position: absolute;
  top: 0;
  left: 0;
  width: 100%;
  height: 100%;
  background: linear-gradient(135deg, var(--primary-color) 25%, transparent 25%) -50px 0,
              linear-gradient(225deg, var(--primary-color) 25%, transparent 25%) -50px 0,
              linear-gradient(315deg, var(--primary-color) 25%, transparent 25%) 0px 0,
              linear-gradient(45deg, var(--primary-color) 25%, transparent 25%) 0px 0;
  background-size: 100px 100px;
  animation: moveBackground 10s linear infinite;
  z-index: -1;
}

@keyframes moveBackground {
  from {
    background-position: 0 0, 0 0, 0 0, 0 0;
  }
  to {
    background-position: 100px 100px, 100px 100px, 100px 100px, 100px 100px;
  }
}

/* 主内容区域样式 */
.core-content {
  display: flex;
  flex-wrap: wrap;
  justify-content: center;
  padding: 150px 40px 60px 40px; /* 顶部留出导航栏空间 */
  background-color: var(--background-color);
}

.card {
  background-color: #fff;
  border-radius: 10px;
  box-shadow: 0 4px 6px rgba(0, 0, 0, 0.1);
  margin: 20px;
  padding: 30px;
  width: 300px;
  transition: transform 0.3s ease, box-shadow 0.3s ease;
}

.card:hover {
  transform: translateY(-10px);
  box-shadow: 0 8px 12px rgba(0, 0, 0, 0.2);
}

.card h3 {
  color: var(--primary-color);
  margin-bottom: 15px;
  font-size: 20px;
}

.card p {
  color: #555;
  font-size: 16px;
  line-height: 1.6;
}

/* 数据仪表盘区域样式 */
.dashboard {
  display: grid;
  grid-template-columns: repeat(auto-fit, minmax(300px, 1fr));
  gap: 20px;
  padding: 60px 40px;
  background-color: #E0E0E0;
}

.chart {
  background-color: #fff;
  border-radius: 10px;
  padding: 20px;
  box-shadow: 0 4px 6px rgba(0, 0, 0, 0.1);
  transition: transform 0.3s ease;
}

.chart:hover {
  transform: scale(1.05);
}

.chart canvas {
  width: 100%;
  height: auto;
}

/* 功能介绍区域样式 */
.function-intro {
  display: flex;
  flex-direction: column;
  align-items: center;
  padding: 60px 40px;
  background-color: #fff;
}

.step {
  display: flex;
  align-items: center;
  margin: 15px 0;
  width: 80%;
  transition: background-color 0.3s ease;
}

.step:hover {
  background-color: var(--secondary-color);
  border-radius: 8px;
}

.step-icon {
  width: 60px;
  height: 60px;
  background-color: var(--accent-color);
  border-radius: 50%;
  display: flex;
  justify-content: center;
  align-items: center;
  margin-right: 20px;
  transition: transform 0.3s ease;
}

.step-icon:hover {
  transform: rotate(360deg);
}

.step-description {
  font-size: 16px;
  color: #333;
  font-family: 'Verdana', sans-serif;
}

/* 用户案例展示区域样式 */
.user-cases {
  display: flex;
  flex-wrap: wrap;
  justify-content: center;
  padding: 60px 40px;
  background-color: #E0E0E0;
}

.user-card {
  background-color: #fff;
  border: 1px solid #e0e0e0;
  border-radius: 10px;
  margin: 20px;
  padding: 30px;
  width: 300px;
  opacity: 0;
  transform: translateY(20px);
  animation: fadeInUp 1s forwards;
}

.user-card:nth-child(odd) {
  animation-delay: 0.3s;
}

.user-card:nth-child(even) {
  animation-delay: 0.6s;
}

@keyframes fadeInUp {
  to {
    opacity: 1;
    transform: translateY(0);
  }
}

.user-card img {
  width: 60px;
  height: 60px;
  margin-bottom: 15px;
}

.user-card p {
  color: #555;
  font-size: 16px;
  line-height: 1.6;
}

/* 页脚样式 */
.footer {
  display: flex;
  justify-content: space-between;
  align-items: center;
  padding: 40px;
  background-color: var(--primary-color);
  color: #fff;
}

.footer .links a {
  color: #fff;
  text-decoration: none;
  margin: 0 10px;
  font-size: 16px;
  transition: color 0.3s ease;
}

.footer .links a:hover {
  color: var(--accent-color);
}

.footer .copyright {
  font-size: 14px;
}

/* 章节导航样式 */
.chapter-nav {
  position: fixed;
  right: 20px;
  top: 100px;
  display: flex;
  flex-direction: column;
}

.chapter-nav a {
  margin: 10px 0;
  color: var(--primary-color);
  text-decoration: none;
  font-size: 16px;
  transition: color 0.3s ease;
}

.chapter-nav a:hover {
  color: var(--accent-color);
}

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

img.decorative:hover {
  transform: scale(1.05);
}

/* 代码块样式 */
pre {
  background-color: #f0f0f0;
  padding: 15px;
  border-radius: 8px;
  overflow-x: auto;
  margin: 20px 0;
}

code {
  font-family: 'Courier New', monospace;
  color: #d14;
}

/* 响应式设计 */
@media (max-width: 768px) {
  .navbar {
    flex-direction: column;
    align-items: flex-start;
  }

  .core-content, .dashboard, .user-cases, .function-intro {
    padding: 120px 20px 40px 20px;
  }

  .card, .chart, .user-card, .step {
    width: 100%;
    margin: 15px 0;
  }

  .chapter-nav {
    display: none;
  }
}