/* 基础样式设置 */
body {
    margin: 0;
    padding: 0;
    font-family: 'Roboto', sans-serif;
    font-size: 16px;
    line-height: 1.6;
    background: linear-gradient(135deg, #1E3A8A 70%, #8B5CF6 25%, #F59E0B 5%);
    color: #333333;
    overflow-x: hidden; /* 防止横向滚动条 */
}

/* 导航栏样式 */
.navbar {
    position: fixed;
    top: 0;
    width: 100%;
    background-color: rgba(30, 58, 138, 0.9); /* 主色透明背景 */
    padding: 15px 20px;
    z-index: 1000;
    box-shadow: 0 2px 4px rgba(0,0,0,0.1);
}

.navbar a {
    color: #FFFFFF;
    margin-right: 20px;
    text-decoration: none;
    font-size: 18px;
    transition: color 0.3s ease;
}

.navbar a:hover {
    color: #F59E0B; /* 点缀色悬停效果 */
}

/* 章节导航系统 */
.section-nav {
    position: fixed;
    top: 70px;
    right: 20px;
    background-color: rgba(255, 255, 255, 0.8);
    padding: 10px 15px;
    border-radius: 8px;
    box-shadow: 0 2px 8px rgba(0,0,0,0.1);
}

.section-nav a {
    display: block;
    margin-bottom: 10px;
    color: #1E3A8A;
    text-decoration: none;
    font-size: 16px;
    transition: color 0.3s ease;
}

.section-nav a:last-child {
    margin-bottom: 0;
}

.section-nav a:hover {
    color: #8B5CF6;
}

/* 主内容区样式 */
.container {
    max-width: 1200px;
    margin: 100px auto 50px auto; /* 顶部留出导航栏空间 */
    padding: 20px;
    display: grid;
    grid-template-columns: repeat(12, 1fr);
    gap: 20px;
}

/* 文章内容样式 */
article {
    grid-column: 1 / -1;
    background-color: #FFFFFF;
    padding: 30px;
    border-radius: 10px;
    box-shadow: 0 4px 6px rgba(0,0,0,0.1);
}

article h2 {
    font-size: 24px;
    color: #1E3A8A;
    margin-bottom: 15px;
}

article h3 {
    font-size: 20px;
    color: #8B5CF6;
    margin-top: 25px;
    margin-bottom: 10px;
}

article section {
    margin-bottom: 20px;
    font-size: 16px;
    color: #555555;
}

/* 图片装饰样式 */
.decorative-images {
    display: flex;
    flex-wrap: wrap;
    gap: 15px;
    margin-top: 30px;
}

.decorative-images img {
    width: 100%;
    max-width: 320px;
    border-radius: 10px;
    box-shadow: 0 4px 8px rgba(0,0,0,0.1);
    transition: transform 0.3s ease, box-shadow 0.3s ease;
}

.decorative-images img:hover {
    transform: scale(1.05);
    box-shadow: 0 6px 12px rgba(0,0,0,0.2);
}

/* 代码块样式 */
pre {
    background-color: #F3F4F6;
    padding: 15px;
    border-radius: 8px;
    overflow-x: auto;
    font-size: 14px;
    margin: 20px 0;
}

code {
    font-family: 'Courier New', Courier, monospace;
    color: #1E3A8A;
}

/* 按钮样式 */
.button {
    display: inline-block;
    background-color: #8B5CF6;
    color: #FFFFFF;
    padding: 10px 20px;
    border: none;
    border-radius: 5px;
    cursor: pointer;
    transition: background-color 0.3s ease, transform 0.2s ease;
    text-decoration: none;
    font-size: 16px;
}

.button:hover {
    background-color: #7C3AED;
    transform: scale(1.05);
}

/* 滚动触发动画 */
.section-animate {
    opacity: 0;
    transform: translateY(20px);
    transition: opacity 0.6s ease-out, transform 0.6s ease-out;
}

.section-animate.visible {
    opacity: 1;
    transform: translateY(0);
}

/* 响应式设计 */
@media (max-width: 1200px) {
    .container {
        grid-template-columns: repeat(8, 1fr);
    }
}

@media (max-width: 768px) {
    .container {
        grid-template-columns: repeat(4, 1fr);
    }
    .navbar a {
        display: block;
        margin-bottom: 10px;
    }
    .section-nav {
        display: none; /* 移动设备隐藏章节导航 */
    }
}

@media (max-width: 480px) {
    .container {
        grid-template-columns: repeat(2, 1fr);
    }
    article h2 {
        font-size: 20px;
    }
    article h3 {
        font-size: 18px;
    }
}