/* 全局样式 */
body {
    margin: 0;
    padding: 0;
    font-family: 'Roboto', sans-serif; /* 使用Roboto无衬线字体 */
    background: radial-gradient(circle, #0F4C81 70%, #f5f5f5 30%, #FFA500 5%); /* 渐变背景，主色70%，辅色25%，点缀色5% */
    color: #333;
    line-height: 1.6;
}

/* 主导航栏样式 */
.navbar {
    position: fixed;
    top: 0;
    width: 100%;
    background-color: rgba(15, 76, 129, 0.9); /* 主色调 */
    display: flex;
    justify-content: space-between;
    align-items: center;
    padding: 20px 50px;
    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: 17px;
    transition: color 0.3s ease;
}

.navbar a:hover {
    color: #FFA500; /* 点缀色 */
}

/* 主要内容容器 */
.container {
    max-width: 1200px;
    margin: 100px auto 50px auto; /* 顶部留出导航栏空间 */
    padding: 20px;
    display: grid;
    grid-template-columns: repeat(auto-fit, minmax(300px, 1fr));
    gap: 30px;
}

/* 文章样式 */
article {
    background-color: #fff;
    padding: 40px;
    border-radius: 10px;
    box-shadow: 0 4px 8px rgba(0,0,0,0.1);
}

article h2, article h3, article h4 {
    color: #0F4C81;
}

article pre {
    background: #f0f0f0;
    padding: 20px;
    border-radius: 5px;
    overflow-x: auto;
    margin: 20px 0;
}

article code {
    font-family: 'Courier New', Courier, monospace;
    color: #d63384;
}

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

img:hover {
    transform: scale(1.05);
    box-shadow: 0 6px 12px rgba(0,0,0,0.15);
}

/* 按钮样式 */
.button {
    display: inline-block;
    background: linear-gradient(45deg, #0F4C81, #FFA500);
    color: #fff;
    padding: 15px 30px;
    border: none;
    border-radius: 5px;
    text-align: center;
    text-decoration: none;
    font-size: 16px;
    cursor: pointer;
    transition: background 0.3s ease, transform 0.3s ease;
}

.button:hover {
    background: linear-gradient(45deg, #FFA500, #0F4C81);
    transform: scale(1.05);
}

/* 导航章节 */
.chapter-nav {
    position: fixed;
    right: 20px;
    top: 100px;
    background: rgba(15, 76, 129, 0.8);
    padding: 15px;
    border-radius: 10px;
    box-shadow: 0 4px 6px rgba(0,0,0,0.1);
}

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

.chapter-nav a:hover {
    color: #FFA500;
}

/* 提示信息样式 */
.notice {
    text-align: center;
    font-size: 18px;
    color: #FFA500;
    margin-bottom: 30px;
    font-weight: bold;
}

/* 折叠区域样式 */
.collapsible {
    background-color: #0F4C81;
    color: white;
    cursor: pointer;
    padding: 18px;
    width: 100%;
    border: none;
    text-align: left;
    outline: none;
    font-size: 17px;
    border-radius: 5px;
    margin-top: 20px;
    transition: background 0.3s ease;
}

.collapsible:hover {
    background-color: #FFA500;
}

.content {
    padding: 0 18px;
    display: none;
    overflow: hidden;
    background-color: #f1f1f1;
    border-radius: 5px;
}

.content p {
    color: #333;
}

/* 代码示例样式 */
.code-example {
    background: #2d2d2d;
    color: #f8f8f2;
    padding: 20px;
    border-radius: 5px;
    overflow-x: auto;
    font-family: 'Courier New', Courier, monospace;
}

.code-example .language-css {
    color: #66d9ef;
}

/* 响应式设计 */
@media (max-width: 768px) {
    .navbar {
        flex-direction: column;
        align-items: flex-start;
    }
    .chapter-nav {
        position: static;
        margin-top: 20px;
    }
}