/* 全局样式设置 */
body {
    margin: 0;
    padding: 0;
    font-family: 'Roboto', sans-serif;
    background: linear-gradient(135deg, #1A237E, #424242);
    color: #ffffff;
}

/* 导航栏样式 */
.navbar {
    position: fixed;
    top: 0;
    width: 100%;
    background-color: #1A237E;
    display: flex;
    justify-content: space-between;
    align-items: center;
    padding: 15px 30px;
    box-shadow: 0 2px 4px rgba(0,0,0,0.3);
    z-index: 1000;
}

.navbar .logo {
    font-size: 1.5em;
    font-weight: bold;
    color: #FF9800;
}

.navbar ul {
    list-style: none;
    display: flex;
    gap: 20px;
}

.navbar ul li a {
    color: #ffffff;
    text-decoration: none;
    transition: color 0.3s ease;
}

.navbar ul li a:hover {
    color: #81C784;
}

/* 主容器样式 */
.container {
    padding: 100px 50px 50px 50px;
    display: grid;
    grid-template-columns: repeat(12, 1fr);
    gap: 20px;
}

/* 侧边导航样式 */
.sidebar {
    grid-column: span 3;
    background-color: rgba(255, 152, 0, 0.1);
    padding: 20px;
    border-radius: 10px;
}

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

.sidebar ul li {
    margin-bottom: 15px;
}

.sidebar ul li a {
    color: #FF9800;
    text-decoration: none;
    font-size: 1.1em;
    transition: color 0.3s ease;
}

.sidebar ul li a:hover {
    color: #81C784;
}

/* 主内容样式 */
.main-content {
    grid-column: span 9;
    display: flex;
    flex-direction: column;
    gap: 30px;
}

/* 图片样式 */
.image-gallery {
    display: flex;
    flex-wrap: wrap;
    gap: 15px;
}

.image-gallery img {
    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;
}

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

/* 提示信息样式 */
.promo {
    background-color: rgba(129, 199, 132, 0.2);
    padding: 20px;
    border-left: 5px solid #FF9800;
    border-radius: 5px;
    font-size: 1.2em;
    font-weight: bold;
}

/* 文章样式 */
article {
    background-color: rgba(255, 255, 255, 0.1);
    padding: 30px;
    border-radius: 10px;
    box-shadow: 0 4px 8px rgba(0,0,0,0.2);
}

article h2, article h3 {
    color: #FF9800;
}

article pre {
    background-color: rgba(0,0,0,0.5);
    padding: 15px;
    border-radius: 5px;
    overflow-x: auto;
}

article code {
    color: #81C784;
}

/* 章节导航样式 */
.chapter-nav {
    position: sticky;
    top: 100px;
    background-color: rgba(26, 35, 126, 0.8);
    padding: 15px;
    border-radius: 10px;
}

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

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

.chapter-nav ul li a {
    color: #FF9800;
    text-decoration: none;
    transition: color 0.3s ease;
}

.chapter-nav ul li a:hover {
    color: #81C784;
}

/* 响应式设计 */
@media (max-width: 1200px) {
    .sidebar {
        grid-column: span 4;
    }
    .main-content {
        grid-column: span 8;
    }
}

@media (max-width: 768px) {
    .container {
        grid-template-columns: repeat(1, 1fr);
        padding: 100px 20px 20px 20px;
    }
    .sidebar {
        grid-column: span 1;
    }
    .main-content {
        grid-column: span 1;
    }
    .chapter-nav {
        position: static;
        margin-bottom: 20px;
    }
}