header {
    position: sticky;
    width: 100%;
    height: 100px;
    background: #fff;
    z-index: 9999;
    display: flex;
    justify-content: center;
}
header .header {
    width: 1200px;
    display: flex;
    align-items: center;
    justify-content: space-between;
}
header .header h1 {
    width: 95px;
}
header .header h1 a {
    width: 100%;
}
header .header h1 a img {
    width: 100%;
}
header .header nav {
    display: flex;
    gap: 90px;
}
header .header nav a {
    font-size: 26px;
    font-weight: 800;
}

main {
    padding: 40px 0 100px;
    max-width: 1200px;
    margin: 0 auto;
}

.banner_mo {
    display: none;
}
.buttons_mo {
    display: none;
}
.sub_banner_mo {
    display: none;
}

.top {
    position: relative;
    margin-bottom: 50px;
}
.top pre {
    position: absolute;
    top: 50%;
    left: 50%;
    transform: translate(-50%, -50%);
    text-align: center;
    font-size: 30px;
    font-weight: 700;
    line-height: 1.5;
}
.top pre b {
    font-size: 40px;
    font-weight: 800;
    color: #193251;
    line-height: 1.5;
}

.buttons p {
    font-size: 30px;
    font-weight: 700;
    color: #fff;
    line-height: 1.4;
}
.buttons .item:nth-child(5) p,
.buttons .item:nth-child(6) p {
    color: #000;
}
.buttons {
    display: flex;
    justify-content: space-between;
    align-items: center;
    flex-wrap: wrap;
    gap: 30px;
}
.buttons .item:nth-child(1),
.buttons .item:nth-child(4) {
    width: calc(100% / 2 - 30px);
}
.buttons .item:nth-child(1),
.buttons .item:nth-child(2),
.buttons .item:nth-child(3) {
    margin-bottom: 20px;
}
.buttons .item {
    width: calc(100% / 4 - 30px);
    height: 200px;
    background-color: #193251;
    border-radius: 30px 0 30px 0;
    padding: 30px;
    display: flex;
    flex-direction: column;
    justify-content: space-between;
    align-items: flex-start;
}
.buttons .item:nth-child(2) {
    background-color: #345888;
}
.buttons .item:nth-child(3) {
    background-color: #7590bd;
}
.buttons .item:nth-child(5) {
    background-color: #d2d6e2;
    color: #000;
}
.buttons .item:nth-child(6) {
    background-color: #e8ebf0;
}
.buttons .item > img {
    margin-left: auto;
}

.buttons .item a {
    font-size: 25px;
    font-weight: 600;
    color: #193251;
    padding: 10px 30px;
    display: flex;
    justify-content: center;
    align-items: center;
    background-color: #fff;
    border-radius: 30px;
    margin-left: auto;
}
.buttons .item a img {
    margin-left: 1rem;
}


.sub_header {
    width: 100%;
    display: flex;
    justify-content: center;
    background-image: url(../img/sub_img.png);
}
.sub_header h2 {
    font-size: 30px;
    font-weight: 600;
    color: #fff;
    padding: 40px 0;
    width: 1200px;
}
.section.sub h3 {
    font-size: 25px;
    font-weight: 700;
    color: #274d80;
    margin-bottom: 5px;
}
.section.sub pre {
    font-size: 25px;
    font-weight: 500;
    color: #737373;
    line-height: 1.5;
    margin-bottom: 50px;
}
.section.sub a {
    display: block;
    padding: 30px;
    border-radius: 10px;
    background-color: #d2d6e2;
    display: flex;
    justify-content: space-between;
    align-items: center;
    font-size: 30px;
    font-weight: 600;
    margin-top: 200px;
}
.section.sub a img {
    width: 40px;
}


@media screen and (max-width: 1200px) {
    
}
@media screen and (max-width: 768px) {
    header {
        height: 10rem;
        padding: 1.5rem;
        margin-bottom: 2rem;
    }
    header .header {
        width: 100%;
        display: flex;
        flex-direction: column;
        align-items: center;
        justify-content: space-between;
    }
    header .header h1 {
        width: 7rem;
    }
    header .header nav {
        gap: 1.5rem;
        width: 100%;
        justify-content: space-between;
    }
    header .header nav a {
        font-size: 1.6rem;
        font-weight: 800;
    }
    
    main {
        padding: 0 1.5rem 5rem;
    }

    .banner {
        display: none;
    }
    .banner_mo {
        display: block;
    }
    .buttons {
        display: none;
    }
    .buttons_mo {
        display: flex;
    }
    .sub_banner {
        display: none;
    }
    .sub_banner_mo {
        display: block;
    }

    .top {
        margin-bottom: 3rem;
    }
    .top img {
        width: 100%;
    }
    .top pre {
        width: 100%;
        font-size: 1.6rem;
    }
    .top pre b {
        font-size: 2rem;
    }

    .buttons_mo p {
        font-size: 1.6rem;
        font-weight: 700;
        color: #fff;
        line-height: 1.4;
    }
    .buttons_mo .item:nth-child(5) p,
    .buttons_mo .item:nth-child(6) p {
        color: #000;
    }
    .buttons_mo {
        display: flex;
        justify-content: space-between;
        align-items: center;
        flex-wrap: wrap;
        gap: 2rem;
    }
    .buttons_mo .item {
        width: calc(100% / 2 - 1rem);
        height: 12rem;
        background-color: #193251;
        border-radius: 3rem 0 3rem 0;
        padding: 2rem;
        display: flex;
        flex-direction: column;
        justify-content: space-between;
        align-items: flex-start;
    }
    .buttons_mo .item:nth-child(1),
    .buttons_mo .item:nth-child(2) {
        align-items: center;
    }

    .buttons_mo .item:nth-child(3) {
        background-color: #345888;
    }
    .buttons_mo .item:nth-child(4) {
        background-color: #7590bd;
    }
    .buttons_mo .item:nth-child(5) {
        background-color: #d2d6e2;
        color: #000;
    }
    .buttons_mo .item:nth-child(6) {
        background-color: #e8ebf0;
    }
    .buttons_mo .item > img {
        width: 3rem;
        margin-left: auto;
    }
    
    .buttons_mo .item a {
        font-size: 1.6rem;
        font-weight: 600;
        color: #193251;
        padding: 1rem 3rem;
        display: flex;
        justify-content: center;
        align-items: center;
        background-color: #fff;
        border-radius: 3rem;
    }
    .buttons_mo .item a img {
        width: 2rem;
        margin-left: 1rem;
    }

    .sub_header {
        background-image: url(../img/sub_img_mo.png);
        margin-top: -2rem;
        margin-bottom: 3rem;
    }
    .sub_header h2 {
        font-size: 1.8rem;
        padding: 3rem 1.5rem;
    }
    .section.sub h3 {
        font-size: 1.7rem;
        margin-bottom: 0.5rem;
    }
    .section.sub pre {
        font-size: 1.6rem;
        margin-bottom: 3rem;
        line-height: 1.6;
    }
    .section.sub a {
        display: flex;
        justify-content: space-between;
        align-items: center;
        padding: 2rem 1.5rem;
        font-size: 1.8rem;
        margin-top: 10rem;
    }
    .section.sub a img {
        width: 3rem;
    }
}