/* 全局样式设置 */
body {
    margin: 0;
    padding: 0;
    font-family: 'Roboto', sans-serif;
    background: linear-gradient(135deg, #1e1e1e 70%, #2c2c2c 25%, #00aaff 5%);
    color: #e0e0e0;
    transition: background 0.5s ease, color 0.5s ease;
}

/* 导航栏样式 */
.header {
    position: fixed;
    top: 0;
    width: 100%;
    background-color: rgba(30, 30, 30, 0.9);
    padding: 20px 40px;
    display: flex;
    justify-content: space-between;
    align-items: center;
    z-index: 1000;
    box-shadow: 0 2px 4px rgba(0,0,0,0.5);
}

.header .logo {
    font-size: 24px;
    font-weight: bold;
    color: #00aaff;
}

.header nav a {
    color: #e0e0e0;
    text-decoration: none;
    margin-left: 20px;
    font-size: 16px;
    transition: color 0.3s ease;
}

.header nav a:hover {
    color: #ffaa00;
}

/* 侧边导航栏样式 */
.sidebar {
    position: fixed;
    top: 80px;
    left: 0;
    width: 200px;
    height: calc(100% - 80px);
    background-color: #2c2c2c;
    padding: 20px;
    box-shadow: 2px 0 5px rgba(0,0,0,0.5);
    overflow-y: auto;
}

.sidebar a {
    display: block;
    color: #e0e0e0;
    text-decoration: none;
    margin: 15px 0;
    font-size: 16px;
    transition: color 0.3s ease;
}

.sidebar a:hover {
    color: #00aaff;
}

/* 主要内容区域样式 */
.main-content {
    margin-left: 220px;
    padding: 100px 40px 40px 40px;
    max-width: 1200px;
}

/* 章节导航提示 */
.prominent-note {
    background-color: #ffaa00;
    color: #1e1e1e;
    padding: 10px 20px;
    border-radius: 5px;
    text-align: center;
    font-size: 18px;
    margin-bottom: 30px;
    box-shadow: 0 4px 6px rgba(0,0,0,0.3);
}

/* 文章内容样式 */
article h2, article h3, article h4 {
    color: #00aaff;
    margin-top: 40px;
}

article p {
    line-height: 1.6;
    font-size: 16px;
    margin: 20px 0;
}

/* 代码块样式 */
pre code {
    display: block;
    background-color: #1e1e1e;
    color: #00ff00;
    padding: 15px;
    border-radius: 8px;
    overflow-x: auto;
    font-family: 'Courier New', Courier, monospace;
    margin: 20px 0;
    box-shadow: 0 4px 6px rgba(0,0,0,0.3);
}

/* 图片样式 */
.image-gallery {
    display: flex;
    flex-wrap: wrap;
    gap: 20px;
    margin: 30px 0;
}

.image-gallery img {
    width: 320px;
    height: 320px;
    object-fit: cover;
    border-radius: 15px;
    box-shadow: 0 4px 8px rgba(0,0,0,0.5);
    transition: transform 0.3s ease, box-shadow 0.3s ease;
}

.image-gallery img:hover {
    transform: scale(1.05);
    box-shadow: 0 8px 16px rgba(0,0,0,0.7);
}

/* 折叠区域样式 */
.collapsible {
    background-color: #3a3a3a;
    color: #e0e0e0;
    cursor: pointer;
    padding: 10px 20px;
    width: 100%;
    border: none;
    text-align: left;
    outline: none;
    font-size: 18px;
    margin: 20px 0;
    border-radius: 5px;
    transition: background-color 0.3s ease;
}

.collapsible:hover {
    background-color: #ffaa00;
    color: #1e1e1e;
}

.collapsible:after {
    content: '\002B';
    font-size: 13px;
    float: right;
}

.collapsible.active:after {
    content: "\2212";
}

.content {
    padding: 0 20px;
    display: none;
    background-color: #2c2c2c;
    overflow: hidden;
    border-radius: 5px;
    margin-bottom: 20px;
}

.content p {
    font-size: 15px;
}

/* 底部信息区样式 */
.footer {
    background-color: #1e1e1e;
    color: #aaaaaa;
    padding: 20px;
    text-align: center;
    font-size: 14px;
    margin-top: 40px;
}

.footer a {
    color: #00aaff;
    text-decoration: none;
    margin: 0 10px;
    transition: color 0.3s ease;
}

.footer a:hover {
    color: #ffaa00;
}

/* 响应式设计 */
@media (max-width: 1200px) {
    .main-content {
        margin-left: 220px;
        padding: 80px 20px 20px 20px;
    }
}

@media (max-width: 768px) {
    .sidebar {
        display: none;
    }
    .main-content {
        margin-left: 0;
        padding: 100px 20px 20px 20px;
    }
    .image-gallery {
        flex-direction: column;
        align-items: center;
    }
}

@media (max-width: 480px) {
    .header {
        flex-direction: column;
        align-items: flex-start;
    }
    .header nav a {
        margin: 10px 0;
    }
    .image-gallery img {
        width: 100%;
        height: auto;
    }
}