/* 引入阿里巴巴普惠体 */
@import url('https://fonts.googleapis.com/css2?family=Noto+Sans+SC:wght@300;400;500;700&display=swap');

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

body {
    font-family: 'Noto Sans SC', sans-serif;
    color: #333;
    line-height: 1.6;
    scroll-behavior: smooth;
    background-color: #fff;
}

.container {
    max-width: 1200px;
    width: 90%;
    margin: 0 auto;
    padding: 0 20px;
}

/* 头部导航 */
.header {
    background-color: #fff;
    box-shadow: 0 2px 8px rgba(0, 0, 0, 0.1);
    position: fixed;
    top: 0;
    left: 0;
    right: 0;
    z-index: 1000;
}

.header .container {
    display: flex;
    justify-content: space-between;
    align-items: center;
    padding: 20px;
}

.logo a {
    text-decoration: none;
}

.logo h1 {
    font-size: 24px;
    font-weight: 700;
    color: #0078FF;
}

.nav ul {
    display: flex;
    list-style: none;
}

.nav ul li {
    margin-left: 40px;
    position: relative;
}

.nav ul li a {
    text-decoration: none;
    color: #333;
    font-size: 16px;
    font-weight: 500;
    transition: color 0.3s ease;
    display: block;
    padding: 10px 0;
}

.nav ul li a:hover {
    color: #0078FF;
}

.nav ul li a.active {
    color: #0078FF;
    border-bottom: 2px solid #0078FF;
    padding-bottom: 5px;
}

/* 下拉菜单 */
.nav ul li .dropdown {
    position: absolute;
    top: 100%;
    left: 0;
    background-color: #fff;
    box-shadow: 0 4px 8px rgba(0, 0, 0, 0.1);
    border-radius: 4px;
    padding: 10px 0;
    min-width: 150px;
    display: none;
    z-index: 1001;
}

.nav ul li:hover .dropdown {
    display: block;
}

.nav ul li .dropdown li {
    margin: 0;
}

.nav ul li .dropdown li a {
    padding: 10px 20px;
    font-size: 14px;
    border-bottom: none;
}

.nav ul li .dropdown li a:hover {
    background-color: #f0f2f5;
}

/* 响应式设计 */
@media (max-width: 1200px) {
    .container {
        width: 90%;
    }
}

@media (max-width: 768px) {
    .header .container {
        flex-direction: column;
        padding: 10px;
    }
    
    .nav ul {
        margin-top: 10px;
    }
    
    .nav ul li {
        margin-left: 20px;
    }
}