/* 全局样式设置 */
body {
    margin: 0;
    padding: 0;
    font-family: 'Roboto', sans-serif; /* 使用现代无衬线字体，确保可读性与科技感 */
    background: linear-gradient(135deg, #0A274B 70%, #4B1C8E 25%, #FF9D2F 5%); /* 主色70%，辅色25%，点缀色5% */
    color: #FFFFFF;
    line-height: 1.6;
}

/* 导航栏样式 */
.navbar {
    position: fixed;
    top: 0;
    width: 100%;
    background: linear-gradient(90deg, #0A274B, #4B1C8E); /* 渐变背景 */
    padding: 20px 40px;
    display: flex;
    justify-content: space-between;
    align-items: center;
    box-shadow: 0 4px 6px rgba(0, 0, 0, 0.1); /* 添加阴影增加质感 */
    z-index: 1000;
}

.navbar a {
    color: #FFFFFF;
    text-decoration: none;
    margin: 0 15px;
    font-size: 16px;
    transition: color 0.3s ease;
}

.navbar a:hover {
    color: #1EA3FF; /* 悬停时颜色变化 */
}

/* 主要内容容器 */
.container {
    display: flex;
    flex-wrap: wrap;
    margin-top: 100px; /* 留出导航栏空间 */
    padding: 20px;
}

/* 侧边栏样式 */
.sidebar {
    flex: 1;
    min-width: 250px;
    background-color: rgba(30, 163, 255, 0.1); /* 半透明背景 */
    padding: 20px;
    border-radius: 10px;
    box-shadow: 0 4px 6px rgba(0, 0, 0, 0.1);
    margin: 10px;
}

.sidebar h3 {
    font-size: 18px;
    margin-bottom: 15px;
    color: #FF9D2F; /* 点缀色 */
}

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

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

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

.sidebar ul li a:hover {
    color: #1EA3FF;
}

/* 主内容区样式 */
.main-content {
    flex: 3;
    min-width: 300px;
    background-color: rgba(75, 28, 142, 0.1); /* 辅助色半透明背景 */
    padding: 20px;
    border-radius: 10px;
    margin: 10px;
}

.main-content h2, .main-content h3, .main-content h4 {
    color: #FFFFFF;
}

.main-content h2 {
    font-size: 24px;
    margin-bottom: 20px;
}

.main-content h3 {
    font-size: 20px;
    margin-top: 20px;
    margin-bottom: 10px;
    color: #1EA3FF; /* 点缀色 */
}

.main-content h4 {
    font-size: 18px;
    margin-top: 15px;
    margin-bottom: 8px;
}

.main-content p {
    font-size: 16px;
    margin-bottom: 15px;
    color: #F0F0F0;
}

/* 图片装饰样式 */
.decorative-image {
    width: 100%;
    max-width: 320px;
    border-radius: 15px;
    box-shadow: 0 4px 8px rgba(0, 0, 0, 0.2);
    margin: 10px 0;
    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);
}

/* 代码块样式 */
.code-block {
    background-color: rgba(0, 0, 0, 0.7);
    padding: 15px;
    border-radius: 8px;
    overflow-x: auto;
    margin: 20px 0;
}

.code-block pre {
    margin: 0;
    font-family: 'Courier New', Courier, monospace;
    color: #00FF00;
}

.code-block code {
    font-size: 14px;
}

/* 底部区域样式 */
.footer {
    background-color: #0A274B;
    padding: 40px 20px;
    display: flex;
    flex-wrap: wrap;
    justify-content: space-between;
}

.footer .resources, .footer .reviews {
    flex: 1;
    min-width: 250px;
    margin: 10px;
}

.footer h3 {
    font-size: 18px;
    margin-bottom: 15px;
    color: #FF9D2F;
}

.footer p {
    font-size: 16px;
    color: #F0F0F0;
}

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

    .container {
        flex-direction: column;
    }

    .sidebar, .main-content {
        margin: 10px 0;
    }

    .footer {
        flex-direction: column;
        align-items: center;
    }
}

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

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

/* 按钮样式 */
.button {
    background-color: #1EA3FF;
    color: #FFFFFF;
    padding: 10px 20px;
    border: none;
    border-radius: 25px;
    cursor: pointer;
    transition: background-color 0.3s ease, transform 0.3s ease;
    font-size: 16px;
}

.button:hover {
    background-color: #FF9D2F;
    transform: translateY(-5px);
}

/* 导航菜单下拉效果 */
.navbar .dropdown {
    position: relative;
    display: inline-block;
}

.navbar .dropdown-content {
    display: none;
    position: absolute;
    background-color: rgba(75, 28, 142, 0.9);
    min-width: 160px;
    box-shadow: 0 8px 16px rgba(0,0,0,0.2);
    z-index: 1;
    border-radius: 8px;
}

.navbar .dropdown-content a {
    color: #FFFFFF;
    padding: 12px 16px;
    text-decoration: none;
    display: block;
    transition: background-color 0.3s ease;
}

.navbar .dropdown-content a:hover {
    background-color: #1EA3FF;
}

.navbar .dropdown:hover .dropdown-content {
    display: block;
}

/* 卡片样式 */
.card {
    background-color: rgba(255, 255, 255, 0.1);
    border-radius: 10px;
    padding: 20px;
    margin: 10px 0;
    box-shadow: 0 4px 6px rgba(0, 0, 0, 0.1);
    transition: transform 0.3s ease, box-shadow 0.3s ease;
}

.card:hover {
    transform: translateY(-10px);
    box-shadow: 0 10px 15px rgba(0, 0, 0, 0.2);
}

/* 导航系统样式 */
.chapter-navigation {
    position: sticky;
    top: 120px;
    padding: 10px;
    background-color: rgba(30, 163, 255, 0.2);
    border-radius: 8px;
    margin-bottom: 20px;
}

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

.chapter-navigation ul li {
    margin: 10px 0;
}

.chapter-navigation ul li a {
    color: #FFFFFF;
    text-decoration: none;
    font-size: 16px;
    transition: color 0.3s ease;
}

.chapter-navigation ul li a:hover {
    color: #FF9D2F;
}