/* 全局样式设置 */
:root {
  /* 颜色变量 */
  --primary-color: #1E90FF; /* 主色调 - 蓝色 */
  --secondary-color: #f0f4f8; /* 辅色调 - 浅灰色 */
  --accent-color: #FFA500; /* 点缀色 - 橙色 */
  --text-color: #333333; /* 文字颜色 */
  --background-gradient: linear-gradient(135deg, #1E90FF 0%, #00BFFF 100%); /* 渐变背景 */
  
  /* 字体设置 */
  --font-primary: 'Roboto', sans-serif;
  --font-secondary: 'Montserrat', sans-serif;
  
  /* 断点设置 */
  --breakpoint-mobile: 480px;
  --breakpoint-tablet: 768px;
  --breakpoint-desktop: 1200px;
}

/* 全局基础样式 */
* {
  margin: 0;
  padding: 0;
  box-sizing: border-box;
}

body {
  font-family: var(--font-primary);
  color: var(--text-color);
  background: var(--secondary-color);
  line-height: 1.6;
  overflow-x: hidden;
}

/* 导航栏样式 */
.header {
  position: fixed;
  top: 0;
  width: 100%;
  background-color: var(--primary-color);
  padding: 20px 50px;
  box-shadow: 0 2px 4px rgba(0, 0, 0, 0.1);
  z-index: 1000;
  display: flex;
  justify-content: space-between;
  align-items: center;
  transition: background-color 0.3s ease;
}

.header.scrolled {
  background-color: #1C86EE;
}

.header .logo {
  font-family: var(--font-secondary);
  font-size: 1.5em;
  color: var(--secondary-color);
  text-decoration: none;
}

.header nav ul {
  list-style: none;
  display: flex;
  gap: 20px;
}

.header nav ul li a {
  color: var(--secondary-color);
  text-decoration: none;
  font-size: 1em;
  transition: color 0.3s ease;
}

.header nav ul li a:hover {
  color: var(--accent-color);
}

/* 主要内容区域 */
.main {
  padding: 100px 50px 50px 50px;
  display: grid;
  grid-template-columns: 1fr 1fr;
  gap: 50px;
}

.main .content {
  max-width: 650px;
}

.main .content h2,
.main .content h3,
.main .content h4 {
  font-family: var(--font-secondary);
  color: var(--primary-color);
  margin-bottom: 15px;
}

.main .content p {
  margin-bottom: 20px;
}

.main .content pre {
  background: #f5f5f5;
  padding: 15px;
  border-radius: 5px;
  overflow-x: auto;
  margin-bottom: 20px;
}

.main .content pre code {
  font-family: 'Courier New', Courier, monospace;
  color: #2d2d2d;
}

/* 图片样式 */
.image-gallery {
  display: flex;
  flex-wrap: wrap;
  gap: 20px;
}

.image-gallery img {
  max-width: 100%;
  border-radius: 10px;
  box-shadow: 0 4px 8px rgba(0, 0, 0, 0.2);
  transition: transform 0.3s ease, box-shadow 0.3s ease;
}

.image-gallery img:hover {
  transform: scale(1.05);
  box-shadow: 0 8px 16px rgba(0, 0, 0, 0.3);
}

/* 提示信息样式 */
.reference-note {
  background: var(--primary-color);
  color: var(--secondary-color);
  padding: 20px;
  border-radius: 5px;
  text-align: center;
  font-size: 1.2em;
  margin-bottom: 40px;
}

/* 代码示例样式 */
.code-sample {
  background: #282c34;
  color: #61dafb;
  padding: 20px;
  border-radius: 5px;
  font-family: 'Courier New', Courier, monospace;
  overflow-x: auto;
  margin-bottom: 20px;
}

.code-sample code {
  display: block;
}

/* 响应式设计 */
@media (max-width: 1200px) {
  .main {
    grid-template-columns: 1fr;
    padding: 100px 30px 30px 30px;
  }
}

@media (max-width: 768px) {
  .header {
    padding: 15px 30px;
  }
  
  .header nav ul {
    gap: 15px;
  }
  
  .main {
    padding: 100px 20px 20px 20px;
    gap: 30px;
  }
}

@media (max-width: 480px) {
  .header {
    flex-direction: column;
    align-items: flex-start;
  }
  
  .header nav ul {
    flex-direction: column;
    gap: 10px;
  }
  
  .main {
    padding: 100px 10px 10px 10px;
  }
}

/* 过渡效果与动画 */
.button {
  background: var(--accent-color);
  color: var(--secondary-color);
  padding: 10px 20px;
  border: none;
  border-radius: 25px;
  cursor: pointer;
  transition: background 0.3s ease, transform 0.3s ease;
}

.button:hover {
  background: #e69500;
  transform: translateY(-3px);
}

.fade-in {
  animation: fadeIn 1s ease-in-out;
}

@keyframes fadeIn {
  from { opacity: 0; }
  to { opacity: 1; }
}