/* 基础样式设置 */
body {
  margin: 0;
  padding: 0;
  font-family: 'Roboto', sans-serif; /* 使用现代无衬线字体 */
  background: linear-gradient(135deg, #6A5ACD, #20B2AA); /* 主色蓝紫渐变 */
  color: #333;
}

/* 响应式容器 */
.container {
  display: grid;
  grid-template-columns: repeat(auto-fit, minmax(500px, 1fr)); /* 每个模块最小宽度500px */
  gap: 20px;
  padding: 60px 20px;
}

/* 模块样式 */
.module {
  background: rgba(255, 255, 255, 0.9); /* 辅色中性背景 */
  border-radius: 10px;
  box-shadow: 0 4px 8px rgba(0, 0, 0, 0.1); /* 阴影效果 */
  padding: 30px;
  transition: transform 0.3s ease, box-shadow 0.3s ease;
}

.module:hover {
  transform: translateY(-10px); /* 悬停微动效果 */
  box-shadow: 0 8px 16px rgba(0, 0, 0, 0.2);
}

/* 标题样式 */
h1, h2, h3, h4 {
  color: #6A5ACD;
  text-shadow: 1px 1px 2px rgba(0,0,0,0.1); /* 标题阴影 */
}

h1 {
  font-size: 2.5em;
  text-align: center;
  margin-bottom: 40px;
}

h2 {
  font-size: 2em;
  margin-bottom: 20px;
}

h3 {
  font-size: 1.75em;
  margin-bottom: 15px;
}

h4 {
  font-size: 1.5em;
  margin-bottom: 10px;
}

/* 段落样式 */
p {
  font-size: 16px;
  line-height: 1.6;
  margin-bottom: 20px;
}

/* 按钮样式 */
.button {
  background: linear-gradient(45deg, #6A5ACD, #20B2AA); /* 按钮渐变色 */
  border: none;
  color: #fff;
  padding: 15px 30px;
  border-radius: 25px;
  cursor: pointer;
  transition: all 0.3s ease;
  text-decoration: none;
  display: inline-block;
}

.button:hover {
  background: linear-gradient(45deg, #20B2AA, #6A5ACD);
  transform: scale(1.05);
}

/* 图片样式 */
img.decorative {
  width: 100%;
  border-radius: 10px;
  box-shadow: 0 4px 8px rgba(0,0,0,0.1);
  transition: transform 0.3s ease, box-shadow 0.3s ease;
}

img.decorative:hover {
  transform: scale(1.02);
  box-shadow: 0 8px 16px rgba(0,0,0,0.2);
}

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

.navbar ul {
  display: flex;
  justify-content: center;
  list-style: none;
  padding: 15px 0;
  margin: 0;
}

.navbar li {
  margin: 0 15px;
}

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

.navbar a:hover {
  color: #20B2AA;
}

/* 面包屑导航 */
.breadcrumb {
  padding: 10px 20px;
  background: rgba(255, 255, 255, 0.8);
  margin-top: 70px; /* 确保不被固定导航栏遮挡 */
}

.breadcrumb a {
  text-decoration: none;
  color: #6A5ACD;
  margin-right: 5px;
}

.breadcrumb span {
  margin-right: 5px;
}

/* 代码块样式 */
pre code {
  display: block;
  padding: 15px;
  background: #f5f5f5;
  border-radius: 5px;
  overflow: auto;
  font-size: 14px;
  position: relative;
}

pre code::before {
  content: "CSS 示例代码";
  display: block;
  background: #6A5ACD;
  color: #fff;
  padding: 5px 10px;
  border-top-left-radius: 5px;
  border-top-right-radius: 5px;
  font-size: 12px;
  position: absolute;
  top: 0;
  left: 0;
}

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

  .container {
    grid-template-columns: 1fr;
    padding: 40px 10px;
  }

  h1 {
    font-size: 2em;
  }

  h2 {
    font-size: 1.75em;
  }

  .button {
    padding: 12px 25px;
  }
}

/* 视觉引导区样式 */
.intro-section {
  text-align: center;
  padding: 80px 20px;
  background: rgba(255, 255, 255, 0.85);
  border-radius: 10px;
  box-shadow: 0 4px 8px rgba(0,0,0,0.1);
}

.intro-section h1 {
  margin-bottom: 20px;
}

.intro-section p {
  max-width: 800px;
  margin: 0 auto 30px auto;
}

/* 折叠区域样式 */
.collapsible {
  background-color: #20B2AA;
  color: white;
  cursor: pointer;
  padding: 15px;
  width: 100%;
  border: none;
  text-align: left;
  outline: none;
  font-size: 16px;
  border-radius: 5px;
  transition: background 0.3s ease;
}

.collapsible:hover {
  background: #6A5ACD;
}

.content {
  padding: 0 15px;
  display: none;
  overflow: hidden;
  background-color: #f1f1f1;
  border-radius: 5px;
}

.content p {
  color: #333;
}

/* 提示信息样式 */
.alert {
  background: #fffae6;
  border-left: 6px solid #ffd700;
  padding: 20px;
  margin: 20px;
  border-radius: 5px;
}