/* 基本样式设置 */
:root {
    /* 颜色变量定义 */
    --primary-color: #0d47a1; /* 主色调深蓝，象征智慧与未来 */
    --secondary-color: #b0bec5; /* 辅助色银色，增强科技感 */
    --accent-color: #ff9800; /* 点缀色橙色，吸引注意力 */
    --background-color: #f5f5f5; /* 页面背景浅灰色，突出内容 */
    --text-color: #333333; /* 正文字体颜色 */
    --header-font: 'Roboto', sans-serif; /* 标题字体 */
    --body-font: 'Helvetica', sans-serif; /* 正文字体 */
}

/* 全局样式 */
body {
    margin: 0;
    padding: 0;
    font-family: var(--body-font);
    color: var(--text-color);
    background-color: var(--background-color);
    line-height: 1.6;
}

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

.navbar .logo {
    font-size: 1.5em;
    font-weight: bold;
}

.navbar .nav-links {
    display: flex;
    gap: 20px;
}

.navbar .nav-links a {
    color: #ffffff;
    text-decoration: none;
    font-weight: bold;
    transition: color 0.3s ease;
}

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

/* Banner样式 */
.banner {
    margin-top: 80px; /* 导航栏高度预留 */
    display: flex;
    flex-wrap: wrap;
    padding: 60px 20px;
    background: linear-gradient(135deg, var(--primary-color), var(--secondary-color));
    color: #ffffff;
    align-items: center;
    justify-content: space-between;
}

.banner .banner-text {
    flex: 1 1 500px;
    padding: 20px;
}

.banner .banner-text h1 {
    font-size: 2.5em;
    margin-bottom: 20px;
}

.banner .banner-text p {
    font-size: 1.2em;
    margin-bottom: 30px;
}

.banner .banner-text a {
    background-color: var(--accent-color);
    color: #ffffff;
    padding: 12px 24px;
    border: none;
    border-radius: 4px;
    text-decoration: none;
    font-size: 1em;
    transition: background-color 0.3s ease, transform 0.3s ease;
}

.banner .banner-text a:hover {
    background-color: #e68900;
    transform: scale(1.05);
}

.banner .banner-image {
    flex: 1 1 500px;
    text-align: center;
}

.banner .banner-image img {
    width: 100%;
    max-width: 400px;
    border-radius: 15px;
    box-shadow: 0 4px 8px rgba(0, 0, 0, 0.2);
    transition: transform 0.3s ease;
}

.banner .banner-image img:hover {
    transform: scale(1.05);
}

/* 主要内容容器 */
.container {
    display: grid;
    grid-template-columns: repeat(auto-fit, minmax(500px, 1fr));
    gap: 40px;
    padding: 60px 40px;
    background-color: #ffffff;
}

/* 模块样式 */
.module {
    background-color: #f9f9f9;
    padding: 30px;
    border-radius: 10px;
    box-shadow: 0 4px 6px rgba(0, 0, 0, 0.1);
    transition: transform 0.3s ease, box-shadow 0.3s ease;
}

.module:hover {
    transform: translateY(-10px);
    box-shadow: 0 8px 12px rgba(0, 0, 0, 0.2);
}

/* 图片样式 */
.module img {
    width: 100%;
    border-radius: 10px;
    box-shadow: 0 2px 4px rgba(0, 0, 0, 0.1);
    transition: transform 0.3s ease;
}

.module img:hover {
    transform: scale(1.05);
}

/* 文章样式 */
article {
    max-width: 800px;
    margin: 0 auto;
    padding: 20px;
}

article h2, article h3, article h4 {
    font-family: var(--header-font);
    color: var(--primary-color);
}

article h2 {
    font-size: 2em;
    margin-bottom: 20px;
}

article h3 {
    font-size: 1.75em;
    margin-top: 40px;
    margin-bottom: 15px;
}

article p {
    font-size: 1.1em;
    margin-bottom: 15px;
}

article pre {
    background-color: #272822;
    color: #f8f8f2;
    padding: 15px;
    border-radius: 5px;
    overflow-x: auto;
    margin-bottom: 20px;
    position: relative;
}

article pre code {
    font-family: 'Courier New', Courier, monospace;
    font-size: 0.95em;
}

/* 代码块标题 */
article pre code::before {
    content: 'CSS代码示例';
    display: block;
    background-color: #333;
    color: #fff;
    padding: 5px 10px;
    font-size: 0.9em;
    border-top-left-radius: 5px;
    border-top-right-radius: 5px;
}

/* 提示语样式 */
.notice {
    background-color: var(--accent-color);
    color: #ffffff;
    padding: 20px;
    border-radius: 5px;
    text-align: center;
    margin: 40px 20px;
    font-size: 1.2em;
}

/* 图文布局 */
.image-text {
    display: flex;
    flex-wrap: wrap;
    gap: 20px;
    margin-bottom: 40px;
}

.image-text .text {
    flex: 1 1 300px;
}

.image-text .text p {
    font-size: 1.1em;
    line-height: 1.8;
}

.image-text .image {
    flex: 1 1 300px;
    text-align: center;
}

.image-text .image img {
    width: 100%;
    max-width: 250px;
    border-radius: 10px;
    box-shadow: 0 2px 4px rgba(0, 0, 0, 0.1);
}

/* 页脚样式 */
footer {
    background-color: var(--primary-color);
    color: #ffffff;
    text-align: center;
    padding: 40px 20px;
}

footer .footer-links {
    display: flex;
    justify-content: center;
    gap: 20px;
    margin-bottom: 20px;
}

footer .footer-links a {
    color: #ffffff;
    text-decoration: none;
    transition: color 0.3s ease;
}

footer .footer-links a:hover {
    color: var(--accent-color);
}

footer p {
    font-size: 1em;
}

/* 响应式设计 */
@media (max-width: 1200px) {
    .container {
        grid-template-columns: repeat(auto-fit, minmax(400px, 1fr));
    }
}

@media (max-width: 768px) {
    .navbar {
        flex-direction: column;
        align-items: flex-start;
        padding: 20px;
    }
    
    .navbar .nav-links {
        flex-direction: column;
        gap: 10px;
        width: 100%;
    }

    .banner {
        flex-direction: column;
        text-align: center;
    }

    .banner .banner-text, .banner .banner-image {
        flex: 1 1 100%;
    }

    .image-text {
        flex-direction: column;
    }
}