/* 全局样式设置 */
/* 设置页面的背景色为深蓝色，使用混合渐变以增加层次感 */
body {
    background: linear-gradient(135deg, #1A202C, #2C3440);
    color: #E5E5E5;
    font-family: 'Open Sans', sans-serif;
    margin: 0;
    padding: 0;
    line-height: 1.6;
}

/* 定义响应式容器 */
.container {
    width: 90%;
    max-width: 1200px;
    margin: 0 auto;
    padding: 20px 0;
}

/* 固定顶部导航栏样式 */
.navbar {
    position: fixed;
    top: 0;
    width: 100%;
    background-color: #4CAF50;
    box-shadow: 0 2px 5px rgba(0,0,0,0.3);
    z-index: 1000;
    transition: background-color 0.3s ease;
}

/* 导航栏悬停效果 */
.navbar:hover {
    background-color: #673AB7;
}

/* 导航菜单列表样式 */
.navbar ul {
    list-style: none;
    display: flex;
    justify-content: center;
    padding: 10px 0;
    margin: 0;
}

/* 导航项样式 */
.navbar li {
    margin: 0 15px;
}

/* 导航链接样式 */
.navbar a {
    color: #E5E5E5;
    text-decoration: none;
    font-size: 16px;
    transition: color 0.3s ease;
}

/* 导航链接悬停颜色变化 */
.navbar a:hover {
    color: #FF4081;
}

/* 主要内容区块的样式 */
.section {
    padding: 60px 0;
    border-bottom: 1px solid rgba(255, 255, 255, 0.1);
    display: flex;
    flex-direction: column;
    align-items: center;
    text-align: left;
}

/* 标题样式 */
.section h2 {
    font-size: 24px;
    margin-bottom: 20px;
    color: #4CAF50;
    position: relative;
    display: inline-block;
}

/* 标题下方的渐变线条 */
.section h2::after {
    content: '';
    width: 50px;
    height: 3px;
    background: linear-gradient(90deg, #4CAF50, #673AB7);
    position: absolute;
    bottom: -10px;
    left: 50%;
    transform: translateX(-50%);
}

/* 段落文本样式 */
.section p {
    font-size: 16px;
    max-width: 800px;
    margin: 0 auto 30px;
    color: #E5E5E5;
}

/* 代码块样式，区别于正文 */
code, pre {
    background-color: #2C3440;
    color: #FFEB3B;
    padding: 10px;
    border-radius: 5px;
    font-family: 'Courier New', Courier, monospace;
    overflow-x: auto;
}

/* 按钮样式 */
.button {
    background: linear-gradient(135deg, #4CAF50 0%, #673AB7 100%);
    border: none;
    color: white;
    padding: 12px 25px;
    text-align: center;
    text-decoration: none;
    display: inline-block;
    font-size: 16px;
    border-radius: 25px;
    cursor: pointer;
    transition: transform 0.3s ease, box-shadow 0.3s ease;
}

/* 按钮悬停效果 */
.button:hover {
    transform: scale(1.05);
    box-shadow: 0 4px 15px rgba(103, 58, 183, 0.6);
}

/* 图片装饰样式 */
.decorative-image {
    width: 320px;
    height: 320px;
    object-fit: cover;
    border-radius: 15px;
    box-shadow: 0 4px 10px rgba(0,0,0,0.5);
    margin: 20px;
    transition: transform 0.3s ease, box-shadow 0.3s ease;
}

/* 图片悬停效果 */
.decorative-image:hover {
    transform: scale(1.05);
    box-shadow: 0 8px 20px rgba(0,0,0,0.7);
}

/* 模块化网格系统样式 */
.grid-container {
    display: grid;
    grid-template-columns: repeat(auto-fill, minmax(300px, 1fr));
    gap: 30px;
    width: 100%;
    padding: 20px 0;
}

/* 每个模块的样式 */
.grid-item {
    background-color: #2C3440;
    padding: 20px;
    border-radius: 10px;
    box-shadow: 0 4px 15px rgba(0,0,0,0.2);
    transition: transform 0.3s ease, box-shadow 0.3s ease;
}

/* 模块悬停效果 */
.grid-item:hover {
    transform: translateY(-10px);
    box-shadow: 0 8px 25px rgba(0,0,0,0.3);
}

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

    .navbar li {
        margin: 10px 0;
    }

    .section {
        padding: 40px 0;
    }

    .section h2 {
        font-size: 20px;
    }

    .section p {
        font-size: 14px;
    }

    .decorative-image {
        width: 100%;
        height: auto;
    }
}

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

    .button {
        padding: 10px 20px;
        font-size: 14px;
    }

    .section h2 {
        font-size: 18px;
    }

    .section p {
        font-size: 13px;
    }
}

/* CSS3 动画示例 */
@keyframes fadeIn {
    from { opacity: 0; }
    to { opacity: 1; }
}

.fade-in {
    animation: fadeIn 2s ease-in-out;
}

/* 侧边导航栏样式 */
.sidebar {
    position: fixed;
    top: 60px;
    left: 0;
    width: 200px;
    height: 100%;
    background-color: #333;
    padding-top: 20px;
    display: none;
}

.sidebar a {
    padding: 10px 15px;
    text-decoration: none;
    font-size: 16px;
    color: #E5E5E5;
    display: block;
    transition: background-color 0.3s ease;
}

/* 侧边导航链接悬停效果 */
.sidebar a:hover {
    background-color: #4CAF50;
}

/* 显示侧边导航的按钮 */
.toggle-button {
    position: fixed;
    top: 15px;
    left: 15px;
    background-color: #4CAF50;
    border: none;
    color: white;
    padding: 10px 15px;
    cursor: pointer;
    border-radius: 5px;
    z-index: 1001;
    transition: background-color 0.3s ease;
}

.toggle-button:hover {
    background-color: #673AB7;
}

/* 样式设计参考提示 */
.reference-note {
    position: fixed;
    bottom: 10px;
    right: 10px;
    background-color: rgba(76, 175, 80, 0.8);
    color: white;
    padding: 5px 10px;
    border-radius: 15px;
    font-size: 14px;
    z-index: 1000;
    animation: fadeIn 3s ease-in-out;
}

/* 面包屑导航样式 */
.breadcrumb {
    margin: 20px 0;
    font-size: 14px;
}

.breadcrumb a {
    color: #4CAF50;
    text-decoration: none;
    margin-right: 5px;
}

.breadcrumb a:hover {
    text-decoration: underline;
}

/* 表格样式 */
.table {
    width: 100%;
    border-collapse: collapse;
    margin: 20px 0;
}

.table th, .table td {
    border: 1px solid #4CAF50;
    padding: 10px;
    text-align: left;
}

.table th {
    background-color: #4CAF50;
    color: white;
}

/* 卡片样式 */
.card {
    background-color: #2C3440;
    border-radius: 10px;
    padding: 20px;
    box-shadow: 0 4px 15px rgba(0,0,0,0.2);
    transition: transform 0.3s ease, box-shadow 0.3s ease;
}

.card:hover {
    transform: translateY(-10px);
    box-shadow: 0 8px 25px rgba(0,0,0,0.3);
}

/* 滚动平滑 */
html {
    scroll-behavior: smooth;
}