/* 全局样式设置 */
:root {
    /* 主色调：科技蓝 */
    --main-color: #0A1F44;
    /* 辅色调：银色 */
    --secondary-color: #C0C0C0;
    /* 点缀色：荧光绿和橙色 */
    --accent-color1: #00FF00;
    --accent-color2: #FFA500;
    /* 背景色渐变 */
    --background-gradient: linear-gradient(135deg, var(--main-color), #1E2A38);
}

/* 基本样式 */
body {
    margin: 0;
    padding: 0;
    background: var(--background-gradient);
    color: var(--secondary-color);
    font-family: 'Roboto', sans-serif;
    font-size: 16px;
    line-height: 1.6;
    overflow-x: hidden;
}

/* 导航栏样式 */
.navbar {
    position: fixed;
    top: 0;
    left: 0;
    width: 100%;
    background-color: rgba(10, 31, 68, 0.9);
    display: flex;
    justify-content: space-between;
    align-items: center;
    padding: 15px 30px;
    z-index: 1000;
    box-shadow: 0 2px 10px rgba(0,0,0,0.5);
}

.navbar .brand {
    font-size: 18px;
    font-weight: bold;
    color: var(--secondary-color);
}

.navbar .nav-links a {
    color: var(--secondary-color);
    text-decoration: none;
    margin-left: 20px;
    transition: color 0.3s ease;
}

.navbar .nav-links a:hover {
    color: var(--accent-color1);
}

/* 章节导航栏样式 */
.chapter-nav {
    position: fixed;
    right: 20px;
    top: 100px;
    display: flex;
    flex-direction: column;
    gap: 10px;
}

.chapter-nav a {
    background-color: var(--accent-color1);
    color: var(--main-color);
    padding: 10px;
    border-radius: 5px;
    text-decoration: none;
    transition: background-color 0.3s ease;
}

.chapter-nav a:hover {
    background-color: var(--accent-color2);
}

/* 容器样式 */
.container {
    padding: 100px 20px 50px;
    max-width: 1200px;
    margin: 0 auto;
}

/* 高亮提示信息 */
.highlight-message {
    background-color: var(--accent-color1);
    color: var(--main-color);
    padding: 15px;
    text-align: center;
    font-size: 20px;
    border-radius: 5px;
    margin-bottom: 40px;
}

/* 文章标题样式 */
h2, h3, h4 {
    color: var(--secondary-color);
    margin-top: 40px;
    margin-bottom: 20px;
}

/* 段落样式 */
p {
    font-size: 16px;
    color: var(--secondary-color);
    margin-bottom: 20px;
}

/* 代码块样式 */
pre {
    background-color: rgba(0, 0, 0, 0.8);
    padding: 15px;
    border-radius: 5px;
    overflow-x: auto;
}

code {
    color: var(--accent-color1);
    font-family: 'Courier New', Courier, monospace;
}

/* 图片样式 */
img.decorative-img {
    width: 100%;
    max-width: 320px;
    height: auto;
    border-radius: 10px;
    box-shadow: 0 4px 15px rgba(0,0,0,0.3);
    transition: transform 0.3s ease, box-shadow 0.3s ease;
}

img.decorative-img:hover {
    transform: scale(1.05);
    box-shadow: 0 8px 25px rgba(0,0,0,0.5);
}

/* 卡片式设计 */
.card {
    background-color: rgba(10, 31, 68, 0.8);
    border: 1px solid var(--secondary-color);
    border-radius: 10px;
    padding: 20px;
    margin-bottom: 20px;
    transition: transform 0.3s ease, box-shadow 0.3s ease;
}

.card:hover {
    transform: translateY(-10px);
    box-shadow: 0 4px 20px rgba(0, 255, 0, 0.3);
}

/* 网格布局 */
.grid {
    display: grid;
    grid-template-columns: repeat(auto-fit, minmax(300px, 1fr));
    gap: 20px;
}

/* 按钮样式 */
.button-primary {
    background-color: var(--accent-color1);
    border: none;
    padding: 10px 20px;
    color: var(--main-color);
    cursor: pointer;
    border-radius: 5px;
    transition: background-color 0.3s ease;
}

.button-primary:hover {
    background-color: var(--accent-color2);
}

/* 折叠区域样式 */
.collapsible {
    background-color: rgba(10, 31, 68, 0.8);
    color: var(--secondary-color);
    cursor: pointer;
    padding: 15px;
    width: 100%;
    border: none;
    text-align: left;
    outline: none;
    font-size: 16px;
    margin-bottom: 10px;
    border-radius: 5px;
    transition: background-color 0.3s ease;
}

.collapsible:hover {
    background-color: var(--accent-color1);
}

.collapsible:after {
    content: '\002B'; /* 加号 */
    float: right;
}

.collapsible.active:after {
    content: "\2212"; /* 减号 */
}

.content {
    padding: 0 20px;
    display: none;
    overflow: hidden;
    background-color: rgba(10, 31, 68, 0.7);
    border-radius: 5px;
    margin-bottom: 20px;
}

/* CSS3 示例代码样式 */
.css-example {
    background-color: rgba(0, 0, 0, 0.9);
    padding: 15px;
    border-radius: 5px;
    overflow-x: auto;
}

.css-example code {
    color: #00FF00;
    font-family: 'Courier New', Courier, monospace;
}

/* 响应式设计 */
@media (max-width: 1200px) {
    .container {
        padding: 80px 15px 40px;
    }
}

@media (max-width: 768px) {
    .navbar {
        flex-direction: column;
        align-items: flex-start;
    }

    .nav-links {
        display: none;
        flex-direction: column;
        width: 100%;
    }

    .nav-links a {
        margin: 10px 0;
    }

    .chapter-nav {
        display: none;
    }

    .container {
        padding: 80px 10px 20px;
    }
}

/* 动画效果 */
@keyframes fadeInUp {
    from {
        opacity: 0;
        transform: translateY(20px);
    }
    to {
        opacity: 1;
        transform: translateY(0);
    }
}

.animated-text {
    opacity: 0;
    transform: translateY(20px);
    animation: fadeInUp 1s forwards;
}

/* 技术交互动效 */
.parallax-section {
    perspective: 1000px;
    height: auto;
    position: relative;
    overflow: hidden;
}

.parallax-layer {
    position: absolute;
    top: 0;
    left: 0;
    width: 100%;
    height: 100%;
    transform: translateZ(-1px) scale(2);
    background: url('') no-repeat center center;
    background-size: cover;
}

.hover-effect {
    display: inline-block;
    transition: transform 0.3s ease, box-shadow 0.3s ease;
}

.hover-effect:hover {
    transform: scale(1.05);
    box-shadow: 0 4px 15px rgba(255, 165, 0, 0.4);
}