/* 全局样式设置 */
/* 设置页面的基础字体、背景和颜色 */
body {
    margin: 0;
    padding: 0;
    font-family: 'Roboto', sans-serif;
    background-color: #2C3E50; /* 主色调，深蓝色 */
    color: #F5F5F5; /* 辅助色，浅灰色 */
}

/* 设置容器的最大宽度和中心对齐 */
.container {
    max-width: 1200px;
    margin: 0 auto;
    padding: 20px;
}

/* 顶部导航栏样式 */
.navbar {
    display: flex;
    justify-content: space-between;
    align-items: center;
    background: linear-gradient(135deg, #2C3E50, #1ABC9C); /* 渐变背景 */
    padding: 15px 30px;
    box-shadow: 0 4px 6px rgba(0,0,0,0.1);
}

.navbar a {
    color: #F5F5F5;
    text-decoration: none;
    margin: 0 15px;
    font-size: 16px;
    transition: color 0.3s ease;
}

.navbar a:hover {
    color: #E67E22; /* 点缀色，橙色 */
}

/* 章节导航栏样式 */
.chapter-nav {
    display: flex;
    flex-wrap: wrap;
    gap: 10px;
    margin: 20px 0;
}

.chapter-nav a {
    background-color: #1ABC9C;
    color: #FFFFFF;
    padding: 10px 15px;
    border-radius: 20px;
    text-decoration: none;
    font-size: 16px;
    transition: background-color 0.3s ease, transform 0.3s ease;
}

.chapter-nav a:hover {
    background-color: #16A085;
    transform: scale(1.05);
}

/* 主要内容区域样式 */
article {
    background-color: #34495E;
    padding: 30px;
    border-radius: 10px;
    box-shadow: 0 4px 8px rgba(0,0,0,0.2);
}

article h2, article h3, article h4 {
    color: #1ABC9C;
}

article p {
    font-size: 16px;
    line-height: 1.6;
    margin-bottom: 20px;
}

article pre {
    background-color: #1ABC9C;
    padding: 15px;
    border-radius: 5px;
    overflow-x: auto;
    margin-bottom: 20px;
}

article code {
    font-family: 'Courier New', Courier, monospace;
    color: #2C3E50;
}

/* 图片样式 */
img.decorative {
    width: 100%;
    max-width: 320px;
    border-radius: 15px;
    box-shadow: 0 4px 6px rgba(0,0,0,0.3);
    transition: transform 0.3s ease, box-shadow 0.3s ease;
}

img.decorative:hover {
    transform: scale(1.05);
    box-shadow: 0 8px 12px rgba(0,0,0,0.4);
}

/* 按钮样式 */
.button-primary, .button-secondary {
    padding: 12px 24px;
    border: none;
    border-radius: 25px;
    cursor: pointer;
    font-size: 16px;
    transition: background-color 0.3s ease, transform 0.2s ease;
}

.button-primary {
    background: linear-gradient(45deg, #1ABC9C, #E67E22);
    color: #FFFFFF;
}

.button-primary:hover {
    background: linear-gradient(45deg, #E67E22, #1ABC9C);
    transform: scale(1.05);
}

.button-secondary {
    background-color: #E67E22;
    color: #FFFFFF;
}

.button-secondary:hover {
    background-color: #D35400;
    transform: scale(1.05);
}

/* 动态背景动画 */
@keyframes moveBackground {
    0% { background-position: 0% 50%; }
    50% { background-position: 100% 50%; }
    100% { background-position: 0% 50%; }
}

.dynamic-background {
    background: linear-gradient(-45deg, #1ABC9C, #2C3E50, #E67E22, #1ABC9C);
    background-size: 400% 400%;
    animation: moveBackground 15s ease infinite;
    height: 300px;
    border-radius: 10px;
    margin-bottom: 30px;
}

/* 响应式设计 */
@media (max-width: 768px) {
    .navbar {
        flex-direction: column;
        align-items: flex-start;
    }
    
    .chapter-nav {
        flex-direction: column;
    }
    
    img.decorative {
        max-width: 100%;
    }
}

@media (max-width: 480px) {
    body {
        padding: 10px;
    }
    
    .navbar a {
        margin: 5px 0;
    }
    
    .chapter-nav a {
        width: 100%;
        text-align: center;
    }
    
    article {
        padding: 20px;
    }
}