/* 网站整体样式设置 */

/* 定义颜色变量 */
:root {
  --primary-color: #0D1B2A; /* 主色调：深蓝 */
  --secondary-color: #1B263B; /* 辅助色：浅蓝 */
  --neutral-color: #415A77; /* 中性灰 */
  --accent-green: #3AFF00; /* 点缀色绿色 */
  --accent-orange: #FF5733; /* 点缀色橙色 */
  --background-gradient: linear-gradient(135deg, var(--primary-color) 0%, var(--secondary-color) 100%);
  --font-family: 'Roboto', sans-serif; /* 字体设置 */
}

/* 全局样式 */
body {
  margin: 0;
  padding: 0;
  background: var(--background-gradient);
  color: #FFFFFF;
  font-family: var(--font-family);
  line-height: 1.6;
}

a {
  color: var(--accent-green);
  text-decoration: none;
  transition: color 0.3s ease;
}

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

.container {
  width: 90%;
  max-width: 1200px;
  margin: 0 auto;
  display: grid;
  grid-template-columns: repeat(12, 1fr);
  gap: 20px;
  padding: 80px 0; /* 考虑固定导航栏高度 */
}

/* 导航栏样式 */
.navbar {
  position: fixed;
  top: 0;
  width: 100%;
  background-color: var(--secondary-color);
  display: flex;
  justify-content: space-around;
  padding: 15px 0;
  z-index: 1000;
}

.navbar a {
  font-size: 16px;
  font-weight: bold;
}

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

/* 侧边栏样式 */
.sidebar {
  grid-column: span 3;
  background-color: var(--primary-color);
  padding: 20px;
  border-radius: 8px;
  box-shadow: 0 4px 6px rgba(0,0,0,0.3);
  position: sticky;
  top: 80px;
  height: calc(100vh - 80px);
}

.sidebar a {
  display: block;
  margin: 10px 0;
  padding: 10px;
  background-color: var(--neutral-color);
  border-radius: 4px;
  transition: background-color 0.3s ease;
}

.sidebar a:hover {
  background-color: var(--accent-green);
}

/* 主内容区样式 */
.main-content {
  grid-column: span 9;
}

.main-content h2 {
  font-size: 20px;
  margin-bottom: 10px;
  color: var(--accent-green);
}

.main-content h3 {
  font-size: 18px;
  margin-bottom: 8px;
  color: var(--accent-orange);
}

.main-content p {
  font-size: 16px;
  margin-bottom: 15px;
}

.main-content pre {
  background-color: var(--neutral-color);
  padding: 15px;
  border-radius: 8px;
  overflow-x: auto;
  margin-bottom: 15px;
}

.main-content code {
  font-family: 'Courier New', Courier, monospace;
  color: var(--accent-green);
}

.main-content img {
  width: 100%;
  border-radius: 8px;
  box-shadow: 0 4px 6px rgba(0,0,0,0.3);
  transition: transform 0.3s ease, box-shadow 0.3s ease;
}

.main-content img:hover {
  transform: scale(1.05);
  box-shadow: 0 6px 8px rgba(0,0,0,0.4);
}

/* 卡片式模块样式 */
.card {
  background-color: var(--secondary-color);
  border-radius: 8px;
  box-shadow: 0 4px 6px rgba(0,0,0,0.2);
  padding: 20px;
  transition: transform 0.3s ease, box-shadow 0.3s ease;
}

.card:hover {
  transform: translateY(-10px);
  box-shadow: 0 6px 10px rgba(0,0,0,0.3);
}

/* 动画与过渡效果 */
@keyframes fadeIn {
  from { opacity: 0; }
  to { opacity: 1; }
}

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

@keyframes bounce {
  0%, 20%, 50%, 80%, 100% { transform: translateY(0); }
  40% { transform: translateY(-10px); }
  60% { transform: translateY(-5px); }
}

.ai-assistant {
  position: fixed;
  bottom: 20px;
  right: 20px;
  width: 60px;
  height: 60px;
  background-color: var(--accent-orange);
  border-radius: 50%;
  display: flex;
  align-items: center;
  justify-content: center;
  cursor: pointer;
  animation: bounce 2s infinite;
}

.ai-assistant img {
  width: 30px;
  height: 30px;
}

/* 章节导航样式 */
.chapter-nav {
  position: fixed;
  top: 100px;
  right: 20px;
  background-color: var(--secondary-color);
  padding: 15px;
  border-radius: 8px;
  box-shadow: 0 4px 6px rgba(0,0,0,0.3);
}

.chapter-nav a {
  display: block;
  margin-bottom: 10px;
  color: var(--accent-green);
  transition: color 0.3s ease;
}

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

/* 响应式设计 */
@media (max-width: 1200px) {
  .sidebar {
    grid-column: span 4;
  }
  .main-content {
    grid-column: span 8;
  }
}

@media (max-width: 992px) {
  .sidebar {
    grid-column: span 12;
    height: auto;
    position: static;
  }
  .main-content {
    grid-column: span 12;
  }
  .chapter-nav {
    display: none;
  }
}

@media (max-width: 768px) {
  .navbar {
    flex-direction: column;
  }
  .navbar a {
    margin: 5px 0;
    font-size: 18px;
  }
  .main-content h2 {
    font-size: 18px;
  }
  .main-content h3 {
    font-size: 16px;
  }
  .main-content p {
    font-size: 15px;
  }
}

@media (max-width: 480px) {
  .navbar {
    padding: 10px 0;
  }
  .navbar a {
    font-size: 16px;
  }
  .ai-assistant {
    width: 50px;
    height: 50px;
  }
}