/* 导航栏共享样式 */
.header {
    display: flex;
    justify-content: space-between;
    align-items: center;
    padding: 1rem 2rem;
    background-color: #ffffff;
    box-shadow: 0 2px 4px rgba(0,0,0,0.1);
    position: fixed;
    top: 0;
    left: 0;
    right: 0;
    z-index: 1000;
}

.logo {
    font-size: 1.2rem;
    font-weight: bold;
}

.logo a {
    color: #333;
    text-decoration: none;
}

.nav-links {
    display: flex;
    gap: 2rem;
}

.nav-item {
    font-family: "Microsoft YaHei", sans-serif;
    font-size: 1.8rem;
    color: #333;
    text-decoration: none;
    padding: 0.5rem 1rem;
    border-radius: 4px;
    transition: all 0.3s ease;
}

.nav-item:hover {
    background-color: #f5f5f5;
    color: #007bff;
}

.nav-item.active {
    color: #007bff;
    font-weight: bold;
}



.username {
    color: #333;
    cursor: pointer;
}

.username:hover {
    color: #007bff;
}