/* 全局样式设置 */
body {
    margin: 0;
    padding: 0;
    font-family: 'Open Sans', sans-serif; /* 设置正文字体 */
    font-size: 16px; /* 正文字号 */
    background: linear-gradient(135deg, #6B73FF 70%, #FFFFFF 25%, #FF8A00 5%); /* 背景渐变色 */
    color: #333333; /* 文字颜色 */
}

/* 导航栏样式 */
.navbar {
    position: fixed;
    top: 0;
    width: 100%;
    height: 60px;
    background: rgba(107, 115, 255, 0.8); /* 半透明主色调 */
    display: flex;
    align-items: center;
    justify-content: space-around;
    box-shadow: 0 2px 4px rgba(0,0,0,0.1); /* 阴影效果 */
    z-index: 1000;
}

.navbar a {
    color: #FFFFFF;
    text-decoration: none;
    font-size: 18px; /* 导航链接字号 */
    transition: color 0.3s;
}

.navbar a:hover {
    color: #FF8A00; /* 悬停时点缀色 */
}

/* 主内容区样式 */
.container {
    padding-top: 80px; /* 留出导航栏空间 */
    max-width: 1200px;
    margin: 0 auto;
    display: grid;
    grid-template-columns: 1fr 3fr;
    grid-gap: 20px;
}

/* 侧边栏样式 */
.sidebar {
    background: rgba(255, 255, 255, 0.9); /* 辅助色 */
    padding: 20px;
    border-radius: 10px;
    box-shadow: 0 4px 6px rgba(0,0,0,0.1);
}

.sidebar h2 {
    font-size: 20px;
    margin-bottom: 15px;
}

.sidebar ul {
    list-style: none;
    padding: 0;
}

.sidebar ul li {
    margin-bottom: 10px;
}

.sidebar ul li a {
    color: #6B73FF;
    text-decoration: none;
    font-size: 16px;
    transition: color 0.3s;
}

.sidebar ul li a:hover {
    color: #FF8A00;
}

/* 文章内容样式 */
.content article {
    background: rgba(255, 255, 255, 0.9); /* 辅助色 */
    padding: 30px;
    border-radius: 10px;
    box-shadow: 0 4px 6px rgba(0,0,0,0.1);
}

.content h2, .content h3, .content h4 {
    color: #000DFF; /* 主色调 */
}

.content h2 {
    font-size: 24px;
    margin-bottom: 20px;
}

.content h3 {
    font-size: 20px;
    margin-top: 25px;
    margin-bottom: 15px;
}

.content h4 {
    font-size: 18px;
    margin-top: 20px;
    margin-bottom: 10px;
}

.content p {
    line-height: 1.6;
    margin-bottom: 15px;
    font-size: 16px;
}

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

.content code {
    font-family: 'Courier New', Courier, monospace;
    color: #DA1B60;
}

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

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

/* 提示信息样式 */
.notice {
    background: #FF8A00;
    color: #FFFFFF;
    padding: 15px;
    text-align: center;
    font-size: 18px;
    margin: 20px 0;
    border-radius: 5px;
}

/* 章节导航样式 */
.chapter-nav {
    position: fixed;
    right: 20px;
    top: 100px;
    background: rgba(255, 255, 255, 0.8);
    padding: 15px;
    border-radius: 10px;
    box-shadow: 0 4px 6px rgba(0,0,0,0.1);
}

.chapter-nav ul {
    list-style: none;
    padding: 0;
}

.chapter-nav ul li {
    margin-bottom: 10px;
}

.chapter-nav ul li a {
    text-decoration: none;
    color: #000DFF;
    font-size: 16px;
    transition: color 0.3s;
}

.chapter-nav ul li a:hover {
    color: #FF8A00;
}

/* 响应式设计 */
@media (max-width: 768px) {
    .container {
        grid-template-columns: 1fr;
    }

    .chapter-nav {
        display: none;
    }

    .navbar {
        flex-direction: column;
        height: auto;
        padding: 10px 0;
    }

    .navbar a {
        margin: 5px 0;
        font-size: 16px;
    }
}

/* CSS3动画示例样式 */
.code-example {
    background: #1E1E1E;
    color: #FFFFFF;
    padding: 20px;
    border-radius: 10px;
    overflow: visible;
    margin-bottom: 20px;
    font-family: 'Courier New', Courier, monospace;
    position: relative;
}

.code-example::before {
    content: 'CSS3 示例代码';
    position: absolute;
    top: -20px;
    left: 20px;
    background: #DA1B60;
    color: #FFFFFF;
    padding: 5px 10px;
    border-radius: 5px;
    font-size: 14px;
}

/* 页面装饰元素 */
.decorative-line {
    height: 4px;
    background: linear-gradient(90deg, #6B73FF, #FF8A00);
    margin: 40px 0;
    border-radius: 2px;
}

/* 按钮样式 */
.button {
    background: #FF8A00;
    color: #FFFFFF;
    padding: 10px 20px;
    border: none;
    border-radius: 5px;
    cursor: pointer;
    transition: background 0.3s, transform 0.3s;
    font-size: 16px;
}

.button:hover {
    background: #DA1B60;
    transform: scale(1.05);
}

/* 特效类 */
.fade-in {
    animation: fadeIn 1s ease-in-out forwards;
}

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