/* 基础样式和共用组件 */
body {
    font-family: 'Microsoft YaHei', Arial, sans-serif;
    line-height: 1.6;
    margin: 0;
    padding: 0;
    color: #333;
    background-color: #f9f9f9;
}

.container {
    width: 90%;
    max-width: 1200px;
    margin: 0 auto;
}

/* 头部样式 */
header {
    background-color: #fff;
    box-shadow: 0 2px 10px rgba(0,0,0,0.1);
    position: fixed;
    width: 100%;
    top: 0;
    z-index: 1000;
    transition: transform 0.3s ease;
}

.header-content {
    display: flex;
    justify-content: space-between;
    align-items: center;
    padding: 15px 0;
}

.logo {
    display: flex;
    align-items: center;
    font-size: 24px;
    font-weight: bold;
    color: #2a5caa;
}

.logo img {
    height: 40px;
    margin-right: 10px;
}

nav ul {
    display: flex;
    list-style: none;
    margin: 0;
    padding: 0;
}

nav ul li {
    margin-left: 30px;
}

nav ul li a {
    text-decoration: none;
    color: #333;
    font-weight: 500;
    transition: color 0.3s;
}

nav ul li a:hover {
    color: #2a5caa;
}

/* 页脚样式 */
/* 基于主视觉区风格的页脚设计 */
footer {
    background: linear-gradient(135deg, #0a1f3a 0%, #142848 100%);
    color: #fff;
    padding: 60px 0 30px;
    position: relative;
    border-top: 1px solid rgba(255,255,255,0.08);
}

/* 顶部科技光效（与主视觉渐变呼应） */
footer::before {
    content: "";
    position: absolute;
    top: -1px;
    left: 0;
    width: 100%;
    height: 3px;
    background: linear-gradient(90deg, 
        rgba(0,102,204,0.8) 0%, 
        rgba(0,204,255,0.6) 50%,
        rgba(0,102,204,0.8) 100%);
    box-shadow: 0 0 15px rgba(0,204,255,0.3);
}

.footer-content {
    display: grid;
    grid-template-columns: repeat(auto-fit, minmax(200px, 1fr));
    gap: 30px;
    margin-bottom: 30px;
}

.footer-column h3 {
    color: #fff;
    margin-bottom: 20px;
    font-size: 18px;
}

.footer-column ul {
    list-style: none;
    padding: 0;
    margin: 0;
}

.footer-column ul li {
    margin-bottom: 10px;
}

.footer-column ul li a {
    color: #bbb;
    text-decoration: none;
    transition: color 0.3s;
}

.footer-column ul li a:hover {
    color: #fff;
}

.copyright {
    text-align: center;
    padding-top: 20px;
    border-top: 1px solid #444;
    color: #999;
    font-size: 14px;
}

/* 共用部分样式 */
.section-title {
    text-align: center;
    margin-bottom: 50px;
}

.section-title h2 {
    font-size: 36px;
    color: #2a5caa;
    margin-bottom: 15px;
}

.section-title p {
    color: #666;
    font-size: 18px;
    max-width: 700px;
    margin: 0 auto;
}

/* 响应式设计 */
@media (max-width: 768px) {
    .header-content {
        flex-direction: column;
    }
    
    nav ul {
        margin-top: 15px;
    }
    
    nav ul li {
        margin-left: 15px;
    }
    
    .section-title h2 {
        font-size: 28px;
    }
}