/* 全局样式设置 */
body {
    margin: 0;
    padding: 0;
    font-family: 'Roboto', sans-serif; /* 使用无衬线字体，增强现代感 */
    background: linear-gradient(135deg, #1A237E 70%, #4CAF50 25%, #FF9800 5%);
    color: #FFFFFF;
}

/* 顶部导航栏样式 */
.navbar {
    position: fixed;
    top: 0;
    width: 100%;
    background-color: rgba(26, 35, 126, 0.9); /* 半透明深蓝色背景 */
    padding: 20px;
    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: 0 15px;
    font-size: 16px;
    transition: color 0.3s ease;
}

.navbar a:hover {
    color: #FF9800; /* 点缀色悬停效果 */
}

/* 主内容区样式 */
.main-content {
    padding: 100px 20px 20px 20px; /* 顶部留白以避开固定导航栏 */
    max-width: 1200px;
    margin: 0 auto;
}

/* 章节导航样式 */
.chapter-nav {
    position: sticky;
    top: 80px;
    background-color: rgba(26, 35, 126, 0.8);
    padding: 10px;
    border-radius: 8px;
    margin-bottom: 20px;
}

.chapter-nav a {
    color: #FFFFFF;
    text-decoration: none;
    margin: 0 10px;
    font-size: 16px;
}

.chapter-nav a:hover {
    color: #4CAF50;
}

/* 文章样式 */
article {
    background-color: rgba(255, 255, 255, 0.1);
    padding: 30px;
    border-radius: 10px;
    box-shadow: 0 4px 6px rgba(0, 0, 0, 0.2);
}

article h2, article h3 {
    color: #FFFFFF;
    margin-bottom: 20px;
}

article p {
    font-size: 16px;
    line-height: 1.8;
    margin-bottom: 20px;
    color: #F5F5F5;
}

/* 图片样式 */
.article-image {
    width: 100%;
    max-width: 320px;
    border-radius: 10px;
    box-shadow: 0 4px 8px rgba(0, 0, 0, 0.3);
    transition: transform 0.3s ease, box-shadow 0.3s ease;
    margin: 20px 0;
}

.article-image:hover {
    transform: scale(1.05);
    box-shadow: 0 8px 16px rgba(0, 0, 0, 0.4);
}

/* 代码块样式 */
pre {
    background-color: rgba(0, 0, 0, 0.7);
    padding: 20px;
    border-radius: 8px;
    overflow-x: auto;
    margin-bottom: 20px;
}

code {
    color: #FF9800;
    font-family: 'Courier New', Courier, monospace;
    font-size: 14px;
}

/* 渐变进度条动画 */
@keyframes gradientLoader {
    0% {
        background-position: 0% 50%;
    }
    50% {
        background-position: 100% 50%;
    }
    100% {
        background-position: 0% 50%;
    }
}

.loader {
    width: 100%;
    height: 4px;
    background: linear-gradient(270deg, #1A237E, #4CAF50, #FF9800, #1A237E);
    background-size: 800% 800%;
    animation: gradientLoader 4s ease infinite;
    border-radius: 2px;
}

/* 响应式布局 */
@media (max-width: 768px) {
    .navbar {
        flex-direction: column;
        align-items: flex-start;
    }

    .chapter-nav {
        position: static;
        margin-bottom: 10px;
    }
}

@media (max-width: 480px) {
    .navbar a {
        margin: 5px 0;
        font-size: 14px;
    }

    article {
        padding: 20px;
    }

    .chapter-nav a {
        font-size: 14px;
        margin: 0 5px;
    }
}