/* 全局样式设置，定义基本字体和背景 */
body {
    margin: 0;
    padding: 0;
    font-family: 'Roboto', sans-serif;
    background: linear-gradient(135deg, #0d1b2a, #aadb);
    color: #333333;
    line-height: 1.6;
}

/* 导航栏样式 */
.navbar {
    position: fixed;
    top: 0;
    width: 100%;
    background-color: rgba(13, 27, 42, 0.9);
    color: #ffffff;
    padding: 15px 30px;
    display: flex;
    justify-content: space-between;
    align-items: center;
    z-index: 1000;
    box-shadow: 0 2px 4px rgba(0, 0, 0, 0.1);
}

.navbar a {
    color: #ffffff;
    text-decoration: none;
    margin-left: 20px;
    transition: color 0.3s ease;
}

.navbar a:hover {
    color: #ff9900;
}

/* 主内容区域的布局 */
.container {
    max-width: 1200px;
    margin: 100px auto 50px auto;
    padding: 20px;
    display: grid;
    grid-template-columns: 250px 1fr;
    grid-gap: 20px;
}

/* 章节导航样式 */
.sidebar {
    position: sticky;
    top: 100px;
    background-color: rgba(255, 255, 255, 0.8);
    padding: 20px;
    border-radius: 8px;
    box-shadow: 0 4px 6px rgba(0,0,0,0.1);
}

.sidebar h3 {
    margin-top: 0;
    font-size: 18px;
    color: #0d1b2a;
}

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

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

.sidebar ul li a {
    color: #0d1b2a;
    text-decoration: none;
    transition: color 0.3s ease;
}

.sidebar ul li a:hover {
    color: #ff9900;
}

/* 文章内容样式 */
.content {
    background-color: rgba(255, 255, 255, 0.9);
    padding: 30px;
    border-radius: 8px;
    box-shadow: 0 4px 6px rgba(0,0,0,0.1);
}

.content h2, .content h3 {
    color: #0d1b2a;
    margin-top: 20px;
}

.content p {
    font-size: 16px;
    color: #333333;
}

.content pre {
    background-color: #f5f5f5;
    padding: 15px;
    border-radius: 5px;
    overflow-x: auto;
    margin: 20px 0;
}

.content code {
    font-family: 'Courier New', Courier, monospace;
    background-color: #eaeaea;
    padding: 2px 4px;
    border-radius: 4px;
    color: #d63333;
}

/* 按钮样式 */
.button-cta {
    background-color: #ff9900;
    color: #ffffff;
    padding: 12px 24px;
    border: none;
    border-radius: 4px;
    font-size: 16px;
    cursor: pointer;
    transition: background-color 0.3s ease;
    text-decoration: none;
    display: inline-block;
}

.button-cta:hover {
    background-color: #e68a00;
}

/* 图片装饰样式 */
.decorative-image {
    width: 100%;
    max-width: 320px;
    border-radius: 10px;
    box-shadow: 0 4px 8px rgba(0,0,0,0.2);
    transition: transform 0.3s ease, box-shadow 0.3s ease;
}

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

/* 提示信息样式 */
.prompt {
    background-color: #ffebcc;
    padding: 15px;
    border-left: 5px solid #ff9900;
    margin: 20px 0;
    border-radius: 4px;
    font-size: 16px;
    color: #664d03;
}

/* 响应式设计 */
@media (max-width: 992px) {
    .container {
        grid-template-columns: 1fr;
    }
    .sidebar {
        position: relative;
        top: 0;
        margin-bottom: 20px;
    }
}

@media (max-width: 768px) {
    .navbar {
        flex-direction: column;
        align-items: flex-start;
    }
    .navbar a {
        margin-left: 0;
        margin-top: 10px;
    }
    .content {
        padding: 20px;
    }
    .content h2 {
        font-size: 24px;
    }
    .content h3 {
        font-size: 20px;
    }
    .content p, .content pre, .content code {
        font-size: 14px;
    }
}

/* 动画效果 */
@keyframes fadeIn {
    from { opacity: 0; }
    to { opacity: 1; }
}

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

/* 链接样式 */
.content a {
    color: #ff9900;
    text-decoration: none;
    transition: color 0.3s ease;
}

.content a:hover {
    color: #0d1b2a;
}

/* 折叠区域样式 */
.collapsible {
    background-color: #f1f1f1;
    color: #0d1b2a;
    cursor: pointer;
    padding: 10px;
    width: 100%;
    border: none;
    text-align: left;
    outline: none;
    font-size: 16px;
    border-radius: 4px;
    margin: 10px 0;
    transition: background-color 0.3s ease;
}

.collapsible:hover {
    background-color: #e6e6e6;
}

.active, .collapsible:hover {
    background-color: #d4d4d4;
}

.content .content-section {
    padding: 0 18px;
    display: none;
    overflow: hidden;
    background-color: #f9f9f9;
    border-radius: 4px;
    margin-bottom: 10px;
}

.content .content-section p {
    margin: 10px 0;
}