/* 全局基础样式（为了样式独立可用，保留必要的基础重置） */
* {
    margin: 0;
    padding: 0;
    box-sizing: border-box;
    font-family: "Microsoft YaHei", "PingFang SC", sans-serif;
}

a {
    text-decoration: none;
    color: inherit;
}

ul {
    list-style: none;
}

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

/* 导航栏专属样式 */
header {
    background-color: #fff;
    box-shadow: 0 2px 4px rgba(0,0,0,0.1);
    position: sticky;
    top: 0;
    z-index: 100;
}

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

.logo {
    font-size: 20px;
    font-weight: bold;
    color: #2c5282;
}

.nav-menu {
    display: flex;
    gap: 30px;
}

.nav-menu li a {
    font-size: 16px;
    padding: 5px 0;
    border-bottom: 2px solid transparent;
    transition: border-color 0.3s;
}

.nav-menu li a:hover {
    border-color: #2c5282;
    color: #2c5282;
}

/* 页脚专属样式 */
footer {
    background-color: #2c5282;
    color: #fff;
    padding: 30px 0;
    text-align: center;
    margin-top: 20px;
}

.footer-info {
    font-size: 14px;
    opacity: 0.9;
}

/* 响应式适配（导航+页脚） */
@media (max-width: 768px) {
    .nav {
        flex-direction: column;
        gap: 10px;
    }

    .nav-menu {
        gap: 15px;
    }
}