/* 全局样式 */
body {
    margin: 0;
    padding: 0;
    font-family: 'Roboto', sans-serif;
    background: linear-gradient(135deg, #0D47A1, #1E88E5); /* 渐变背景 */
    color: #333;
    line-height: 1.6;
}

/* 导航栏样式 */
.navbar {
    position: fixed;
    top: 0;
    width: 100%;
    background: rgba(13, 71, 161, 0.9);
    padding: 15px 30px;
    box-shadow: 0 2px 4px rgba(0, 0, 0, 0.1);
    z-index: 1000;
    display: flex;
    justify-content: space-between;
    align-items: center;
}

.navbar a {
    color: #FFFFFF;
    text-decoration: none;
    margin: 0 15px;
    transition: color 0.3s ease;
}

.navbar a:hover {
    color: #FFA726;
}

/* 侧边栏样式 */
.sidebar {
    position: fixed;
    left: -250px;
    top: 0;
    width: 250px;
    height: 100%;
    background: #1E88E5;
    transition: left 0.3s ease;
    padding: 60px 20px;
}

.sidebar.open {
    left: 0;
}

.sidebar a {
    display: block;
    color: #FFFFFF;
    text-decoration: none;
    margin: 20px 0;
    font-size: 16px;
    transition: color 0.3s ease;
}

.sidebar a:hover {
    color: #FFA726;
}

/* 主内容区样式 */
.container {
    max-width: 1200px;
    margin: 100px auto 50px;
    padding: 20px;
    display: grid;
    grid-template-columns: 1fr 3fr;
    gap: 20px;
}

.article-content {
    background: rgba(255, 255, 255, 0.8);
    padding: 20px;
    border-radius: 10px;
    box-shadow: 0 4px 6px rgba(0, 0, 0, 0.1);
}

.sidebar-section {
    background: rgba(255, 255, 255, 0.8);
    padding: 20px;
    border-radius: 10px;
    box-shadow: 0 4px 6px rgba(0, 0, 0, 0.1);
}

/* 图片样式 */
.image-grid {
    display: flex;
    flex-wrap: wrap;
    gap: 15px;
    margin-top: 20px;
}

.image-grid img {
    width: 100%;
    max-width: 320px;
    height: auto;
    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-grid img:hover {
    transform: scale(1.05);
    box-shadow: 0 8px 16px rgba(0,0,0,0.3);
}

/* 章节导航样式 */
.chapter-nav {
    position: fixed;
    top: 80px;
    right: 20px;
    background: rgba(255, 255, 255, 0.9);
    padding: 10px;
    border-radius: 8px;
    box-shadow: 0 2px 4px rgba(0,0,0,0.1);
}

.chapter-nav a {
    display: block;
    color: #0D47A1;
    text-decoration: none;
    margin: 5px 0;
    font-size: 14px;
    transition: color 0.3s ease;
}

.chapter-nav a:hover {
    color: #FFA726;
}

/* 提示信息样式 */
.reference-note {
    text-align: center;
    font-size: 18px;
    color: #FFFFFF;
    margin-bottom: 30px;
}

/* 代码块样式 */
article pre {
    background: #f5f5f5;
    padding: 15px;
    border-radius: 8px;
    overflow-x: auto;
    margin: 20px 0;
}

article code {
    font-family: 'Courier New', Courier, monospace;
    color: #1E90FF;
}

/* 折叠区域样式 */
.collapsible {
    background-color: #1E88E5;
    color: white;
    cursor: pointer;
    padding: 10px;
    width: 100%;
    border: none;
    text-align: left;
    outline: none;
    font-size: 16px;
    border-radius: 5px;
    margin-top: 10px;
}

.active, .collapsible:hover {
    background-color: #0D47A1;
}

.content {
    padding: 0 15px;
    display: none;
    overflow: hidden;
    background-color: #f1f1f1;
    border-radius: 5px;
    margin-bottom: 10px;
}

/* 响应式设计 */
@media (max-width: 768px) {
    .container {
        grid-template-columns: 1fr;
        margin: 120px 10px 20px;
    }

    .chapter-nav {
        position: static;
        display: flex;
        overflow-x: auto;
    }

    .chapter-nav a {
        margin: 0 10px;
    }

    .navbar a {
        margin: 0 10px;
        font-size: 14px;
    }

    .sidebar {
        width: 200px;
    }
}