.site-header {
    position: fixed;
    top: 0;
    left: 0;
    right: 0;
    z-index: 1000;
    background-color: #1e88e5;  /* 使用蓝色背景 */
    box-shadow: 0 2px 4px rgba(0, 0, 0, 0.1);
    transition: background-color 0.3s ease;
}

.header-container {
    max-width: 1200px;
    margin: 0 auto;
    padding: 15px 20px;
    display: flex;
    justify-content: space-between;
    align-items: center;
}

.site-logo {
    display: block;
}

.site-logo img {
    height: 40px;
    width: auto;
}

.site-nav {
    display: flex;
    gap: 20px;
    align-items: center;
}

.nav-link {
    color: white;
    text-decoration: none;
    font-size: 16px;
    padding: 8px 16px;
    border-radius: 4px;
    transition: background-color 0.3s;
}

.nav-link:hover {
    background-color: rgba(255, 255, 255, 0.1);
    color: white;
}

.nav-link.active {
    background-color: rgba(255, 255, 255, 0.2);
    color: white;
}

/* 首页特殊样式 */
body.home .site-header {
    background-color: transparent;
    box-shadow: none;
}

body.home .site-header:hover {
    background-color: #1e88e5;
}

/* 为了防止页眉遮挡内容 */
body {
    padding-top: 70px;
}

/* 首页不需要padding */
body.home {
    padding-top: 0;
}

/* 响应式设计 */
@media (max-width: 768px) {
    .site-header {
        padding: 5px 0;
    }
    
    .site-logo {
        height: 40px;
    }
}

/* 为了配合固定页眉，给页面内容添加上边距 */
.page-content {
    padding-top: 70px;
}