body {
    margin: 0
}

ul {
    list-style: none
}

a {
    text-decoration: none
}

header{
    text-align: center;
}

.nav { 
    width: 1200px;
    margin: 0 auto;
    max-width: 100%;
}

.nav ul {
    display: flex;
    justify-content: center;
    gap: 20px;
    padding: 10px 0;
}
.nav ul li a {
    color: #333;
    font-weight: bold;
}

.title h2 {
    text-align: center;
    padding: 10px;
}

.nav1 {
    background-color: #008bc7
}

.nav1 .row {
    width: 1200px;
    margin: 0 auto
}

@media (max-width:960px) {
    .nav1 .row {
        width: 100%
    }
}

.nav1 ul {
    display: flex;
    flex-wrap: wrap;
    margin: 0;
    padding: 0;
    text-align: center
}

.nav1 ul li {
    width: 20%;
    line-height: 50px;
    cursor: pointer
}

.nav1 ul li a {
    color: #ffffff;
    text-decoration: none;
    font-weight: 900
}

@media (max-width:960px) {
    .nav1 ul li {
        width: 33.33%
    }
}

.nav1 ul li:hover,
.nav1 ul .on {
    background: rgba(0, 0, 0, 0.13)
}

.nav1 ul li:hover a,
.nav1 ul .on a {
    color: #ffea52
}

.nav2 {
    background-color: #00da91
}

.nav2 .row {
    width: 1200px;
    margin: 0 auto
}

@media (max-width:960px) {
    .nav2 .row {
        width: 100%
    }
}

.nav2 ul {
    margin: 0;
    padding: 0;
    font-size: 0
}

.nav2 ul li {
    width: 20%;
    line-height: 50px;
    cursor: pointer;
    display: inline-block;
    text-align: center;
    height: 50px
}

.nav2 ul li a {
    color: #ffffff;
    text-decoration: none;
    font-weight: 900;
    font-size: 16px
}

@media (max-width:960px) {
    .nav2 ul li {
        width: 33.33%
    }
}

.nav2 ul li:hover,
.nav2 ul .on {
    background: rgba(0, 0, 0, 0.13)
}

.nav2 ul li:hover a,
.nav2 ul .on a {
    color: #ffea52
}

.nav3 {
    background-color: #004bd6
}

.nav3 .row {
    width: 1200px;
    margin: 0 auto
}

@media (max-width:960px) {
    .nav3 .row {
        width: 100%
    }
}

.nav3 ul {
    margin: 0;
    padding: 0;
    text-align: center;
    height: 50px
}

@media (max-width:960px) {
    .nav3 ul {
        height: auto;
        overflow: hidden
    }
}

.nav3 ul li {
    width: 20%;
    line-height: 50px;
    cursor: pointer;
    float: left
}

.nav3 ul li a {
    color: #ffffff;
    text-decoration: none;
    font-weight: 900
}

@media (max-width:960px) {
    .nav3 ul li {
        width: 33.33%
    }
}

.nav3 ul li:hover,
.nav3 ul .on {
    background: rgba(0, 0, 0, 0.13)
}

.nav3 ul li:hover a,
.nav3 ul .on a {
    color: #ffea52
}

.nav4 {
    background-color: #008bc7
}

.nav4 .row {
    width: 1200px;
    margin: 0 auto
}

@media (max-width:960px) {
    .nav4 .row {
        width: 100%
    }
}

.nav4 ul {
    margin: 0;
    padding: 0;
    text-align: center;
    display: grid;
    grid-template-columns: auto auto auto auto auto
}

@media (max-width:960px) {
    .nav4 ul {
        grid-template-columns: auto auto auto
    }
}

.nav4 ul li {
    line-height: 50px;
    cursor: pointer
}

.nav4 ul li a {
    color: #ffffff;
    text-decoration: none;
    font-weight: 900
}

.nav4 ul li:hover,
.nav4 ul .on {
    background: rgba(0, 0, 0, 0.13)
}

.nav4 ul li:hover a,
.nav4 ul .on a {
    color: #ffea52
}

#nav li {
    position: relative
}

#nav li ul {
    position: absolute;
    left: 0;
    top: 50px;
    width: 100%;
    z-index: 6;
    opacity: 0;
    visibility: hidden;
    overflow: hidden;
    transition: opacity .8s
}

#nav li li {
    float: none;
    width: 100%;
    background-color: #C01E22
}

#nav li li a {
    color: #fff
}

#nav li:hover ul {
    opacity: 1;
    visibility: visible;
    display: block
}