/* 全局样式 */
* {
    margin: 0;
    padding: 0;
    box-sizing: border-box;
}

body {
    font-family: 'Arial', sans-serif;
    line-height: 1.6;
    background-color: #f9f9f9;
    color: #333;
}

.container {
    width: 80%;
    max-width: 1200px;
    margin: 0 auto;
}

/* 页眉 */
.site-header {
    background: #4CAF50;
    color: white;
    text-align: center;
    padding: 20px 0;
}

.site-header h1 {
    font-size: 2rem;
    margin-bottom: 5px;
}

.site-header p {
    font-size: 1rem;
    opacity: 0.9;
}

/* 导航栏 */
.site-nav {
    background: #333;
}

.site-nav ul {
    display: flex;
    justify-content: center;
    list-style: none;
}

.site-nav li {
    margin: 0 15px;
}

.site-nav a {
    color: white;
    text-decoration: none;
    font-size: 1rem;
    transition: color 0.3s ease;
}

.site-nav a:hover {
    color: #4CAF50;
}

/* 主体内容 */
.section {
    padding: 40px 0;
}

.about, .articles, .projects, .contact {
    background: white;
    margin: 20px 0;
    padding: 20px;
    border-radius: 8px;
    box-shadow: 0 2px 5px rgba(0, 0, 0, 0.1);
}

h2 {
    margin-bottom: 20px;
    font-size: 1.8rem;
    color: #4CAF50;
}

.article-list, .project-list {
    display: flex;
    flex-wrap: wrap;
    gap: 20px;
}

.article-item, .project-item {
    flex: 1 1 calc(50% - 20px);
    background: #f7f7f7;
    padding: 15px;
    border-radius: 5px;
}

.article-item h3, .project-item h3 {
    font-size: 1.2rem;
    margin-bottom: 10px;
}

.article-item a, .project-item a {
    color: #4CAF50;
    text-decoration: none;
    transition: color 0.3s ease;
}

.article-item a:hover, .project-item a:hover {
    color: #333;
}

.contact ul {
    list-style: none;
}

.contact li {
    margin: 10px 0;
}

.contact a {
    color: #4CAF50;
    text-decoration: none;
}

.contact a:hover {
    text-decoration: underline;
}

/* 页脚 */
.site-footer {
    background: #333;
    color: white;
    text-align: center;
    padding: 15px 0;
    margin-top: 40px;
}