/* 全局样式重置，确保不同浏览器表现一致 */
* {
    margin: 0;
    padding: 0;
    box-sizing: border-box;
}

/* 设置基础字体、背景及全局过渡效果 */
body {
    font-family: 'Roboto', sans-serif;
    font-size: 16px;
    color: #212121; /* 主文本颜色，确保良好的可读性 */
    background: linear-gradient(135deg, #1A237E 70%, #283593 30%); /* 线性渐变背景，符合主色比例 */
    padding-top: 80px; /* 为固定导航栏留出空间 */
    transition: background 0.5s ease-in-out;
}

/* 固定导航栏样式 */
.navbar {
    position: fixed;
    top: 0;
    width: 100%;
    background-color: #1A237E; /* 主色调 */
    padding: 20px 40px;
    box-shadow: 0 2px 4px rgba(0,0,0,0.1);
    z-index: 1000;
    display: flex;
    justify-content: space-between;
    align-items: center;
}

.navbar .logo a {
    color: #FFFFFF;
    font-size: 24px;
    font-weight: bold;
    text-decoration: none;
}

.navbar .nav-links a {
    color: #FFFFFF;
    text-decoration: none;
    margin-left: 30px;
    font-size: 16px;
    position: relative;
    transition: color 0.3s;
}

.navbar .nav-links a:hover {
    color: #FF9800; /* 点缀色，增强视觉效果 */
}

/* 章节导航栏样式 */
.chapter-nav {
    position: fixed;
    top: 80px;
    left: 0;
    width: 220px;
    background-color: rgba(255, 255, 255, 0.1);
    padding: 20px;
    height: calc(100% - 80px);
    overflow-y: auto;
    backdrop-filter: blur(10px);
}

.chapter-nav a {
    display: block;
    color: #FFFFFF;
    text-decoration: none;
    margin-bottom: 15px;
    font-size: 16px;
    transition: color 0.3s;
}

.chapter-nav a:hover {
    color: #FF9800;
}

/* 主内容区域样式 */
.main-content {
    margin-left: 240px; /* 为章节导航留出空间 */
    padding: 20px;
    display: flex;
    flex-direction: column;
    gap: 40px;
}

/* 提示文字样式 */
.prompt {
    font-size: 20px;
    color: #FFFFFF;
    text-align: center;
    margin: 30px 0;
    animation: fadeIn 2s ease-in-out;
}

/* 卡片样式，适用于展示模块内容 */
.card {
    background-color: rgba(255, 255, 255, 0.9);
    border-radius: 10px;
    box-shadow: 0 4px 8px rgba(0,0,0,0.2);
    padding: 25px;
    transition: transform 0.3s, box-shadow 0.3s;
}

.card:hover {
    transform: translateY(-10px);
    box-shadow: 0 8px 16px rgba(0,0,0,0.3);
}

/* 装饰性图片样式 */
img.decorative {
    width: 100%;
    max-width: 320px;
    height: auto;
    border-radius: 15px;
    box-shadow: 0 4px 8px rgba(0,0,0,0.2);
    transition: transform 0.3s, box-shadow 0.3s;
}

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

/* 文章内容样式 */
article {
    background-color: rgba(255, 255, 255, 0.95);
    padding: 30px;
    border-radius: 10px;
    box-shadow: 0 4px 8px rgba(0,0,0,0.1);
}

article h2, article h3, article h4 {
    color: #1A237E;
    margin-bottom: 15px;
}

article p {
    margin-bottom: 20px;
    line-height: 1.8;
}

article code {
    background-color: #f5f5f5;
    padding: 2px 6px;
    border-radius: 4px;
    color: #D32F2F;
}

/* 代码块样式 */
pre code {
    background-color: #ECEFF1;
    padding: 15px;
    border-radius: 8px;
    display: block;
    overflow-x: auto;
    font-family: 'Courier New', Courier, monospace;
    color: #424242;
}

/* 按钮样式 */
.button {
    background-color: #FF9800;
    color: #FFFFFF;
    padding: 12px 24px;
    border: none;
    border-radius: 6px;
    cursor: pointer;
    transition: background-color 0.3s, transform 0.3s;
    font-size: 16px;
}

.button:hover {
    background-color: #F57C00;
    transform: scale(1.05);
}

/* 多语言切换和在线客服按钮 */
.language-switcher, .chat-support {
    position: fixed;
    bottom: 30px;
    right: 30px;
    background-color: #4CAF50;
    color: #FFFFFF;
    padding: 15px;
    border-radius: 50%;
    box-shadow: 0 4px 8px rgba(0,0,0,0.2);
    cursor: pointer;
    transition: background-color 0.3s, transform 0.3s;
    z-index: 1000;
}

.language-switcher:hover, .chat-support:hover {
    background-color: #388E3C;
    transform: scale(1.1);
}

.language-switcher {
    right: 100px;
    background-color: #FF9800;
}

/* 响应式布局调整 */
@media (max-width: 1200px) {
    .chapter-nav {
        width: 180px;
    }
    .main-content {
        margin-left: 200px;
    }
}

@media (max-width: 992px) {
    .navbar .nav-links a {
        margin-left: 20px;
        font-size: 14px;
    }
}

@media (max-width: 768px) {
    .chapter-nav {
        display: none;
    }
    .main-content {
        margin-left: 0;
    }
}

@media (max-width: 576px) {
    body {
        font-size: 14px;
    }
    .prompt {
        font-size: 18px;
    }
    .navbar {
        flex-direction: column;
        align-items: flex-start;
    }
    .navbar .nav-links a {
        margin: 10px 0;
    }
}

/* 动画关键帧 */
@keyframes fadeIn {
    from { opacity: 0; }
    to { opacity: 1; }
}

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

/* 折叠面板样式 */
.accordion {
    background-color: #283593;
    color: #FFFFFF;
    cursor: pointer;
    padding: 15px;
    width: 100%;
    border: none;
    text-align: left;
    outline: none;
    font-size: 16px;
    transition: background-color 0.3s;
    border-radius: 5px;
    margin-bottom: 10px;
}

.accordion:hover {
    background-color: #3949AB;
}

.panel {
    max-height: 0;
    overflow: hidden;
    transition: max-height 0.3s ease-out;
    background-color: #E8EAF6;
    padding: 0 15px;
    border-radius: 5px;
}

.panel.show {
    max-height: 500px;
    padding: 15px;
}

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

th, td {
    padding: 12px;
    text-align: left;
    border-bottom: 1px solid #ddd;
}

thead {
    background-color: #3949AB;
    color: #FFFFFF;
}

tr:hover {
    background-color: #f1f1f1;
}

/* 虚拟展厅样式 */
.virtual-gallery {
    perspective: 1000px;
    width: 100%;
    height: 100vh;
    background-color: #1A237E;
    display: flex;
    justify-content: center;
    align-items: center;
    flex-wrap: wrap;
    gap: 20px;
    padding: 20px;
}

.gallery-item {
    width: 200px;
    height: 300px;
    background-color: #FFFFFF;
    margin: 20px;
    transform: rotateY(0deg);
    transition: transform 0.5s;
    border-radius: 10px;
    box-shadow: 0 4px 8px rgba(0,0,0,0.2);
}

.gallery-item:hover {
    transform: rotateY(180deg);
}

/* 表单按钮样式 */
.submit-button {
    background-color: #4CAF50;
    color: #FFFFFF;
    padding: 10px 20px;
    border: none;
    border-radius: 5px;
    cursor: pointer;
    transition: background-color 0.3s;
}

.submit-button:hover {
    background-color: #388E3C;
}

/* 数据可视化图表样式 */
.chart-bar {
    width: 100%;
    height: 300px;
    display: flex;
    align-items: flex-end;
    justify-content: space-around;
    background-color: #FFFFFF;
    padding: 20px;
    border-radius: 8px;
    box-shadow: 0 2px 4px rgba(0, 0, 0, 0.1);
}

.bar {
    width: 40px;
    background-color: #4CAF50;
    transition: height 0.3s, background-color 0.3s;
}

.bar:hover {
    background-color: #388E3C;
    height: 100%;
}

/* 表单输入样式 */
input[type="text"], input[type="email"], textarea {
    width: 100%;
    padding: 12px 20px;
    margin: 8px 0;
    display: inline-block;
    border: 1px solid #ccc;
    border-radius: 4px;
    box-sizing: border-box;
}