.logo{
    height: 80px;
    width: 100%;
}
.navbar{
    height: 80px;
}
.navbar-brand{
    margin-left: 40px;
}
.navbar-nav {
    display: flex;
    flex-wrap: wrap; /* 允许换行 */
    align-items: flex-start; /* 向上对齐 */
}

.nav-item {
    display: flex;
    flex-direction: column; /* 让文字垂直排列 */
    align-items: center; /* 默认居中对齐 */
    height: 50px; /* 设置固定高度 */
    justify-content: center; /* 垂直方向上部对齐 */
    white-space: normal; /* 允许文字换行 */
    max-width: 200px; /* 根据需要设置最大宽度 */
    width: 90px;
    height: 40px;
    line-height: 20px;
    font-size: 16px;
    font-weight: 600;
    text-align: center;
    margin-right: 10px;
}
.nav-link{
    color: #000 !important;
    white-space: normal; /* 允许文本换行 */
}
.nav-item:hover{
    border-top: 2px solid #000;
}
.login{
    height: 40px;
    width: 100px;
    border: 1px solid #2255d5;
    color: #2255d5;
    line-height:38px;
    margin-left: 20px;
    margin-right: 30px;
    text-align: center;
    margin-top: 6px;
    font-weight: 600;
    border-radius: 20px;
}
.login a{
    color: #2255d5;
}
.login:hover{
    background-color: #2255d5;
}
.login:hover a{
    color: #fff;
}
@media (max-width: 767px) {
    .logo{
        height: 40px;
        width: 100%;
    }
    .navbar-brand{
        margin-left: 10px;
    }
    .nav-item{
        font-size: 12px;
        height: 30px;
        line-height: 30px;
        margin-left: 10vw;
    }
    .nav-item:hover{
        border-top: 0;
    }
    .login{
        height: 40px;
        width: 100px;
        border: 1px solid #2255d5;
        line-height:38px;
        margin-left: 10px;
        margin-right: 30px;
        text-align: center;
        border-radius: 20px;
    }
}
.login_first {
  display: none;
}