.navigation-container {
    width: 100%;
    margin: 0 auto;
}

header nav{
    display: flex;
    justify-content: flex-end; 
    align-items: center;
    padding: 1.2rem 0;
    width: 100%;
    box-sizing: border-box;
}
header nav ul{
    display: flex;
    gap: 2rem; 
    list-style: none;
    margin: 0;
    padding: 0;
}
header nav ul li a{
    text-decoration: none;
    color: #4a5568;
    font-weight: 500;
    transition: all 0.3s ease;
    position: relative;
    padding: 0.5rem 0;
    font-size: 0.95rem; 
}

/* 下划线动画效果 */
header nav ul li a::after{
    content: '';
    position: absolute;
    bottom: 0;
    left: 0;
    width: 0;
    height: 2px;
    background-color: #1cebb4;
    transition: width 0.3s ease;
}

header nav ul li a:hover{
    color: #2c5282;
}

header nav ul li a:hover::after{
    width: 100%;
}

/* 当前页激活状态 */
header nav ul li a.active{
    color: #2c826e;
}

header nav ul li a.active::after{
    width: 100%;
}