header {
    position: sticky;
    width: 100%;
    padding: 30px 0 40px;
    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: 130px;
}
header .header h1 a {
    width: 100%;
}
header .header h1 a img {
    width: 100%;
}
header .header nav {
    display: flex;
    gap: 80px;
}
header .header nav a {
    font-size: 21px;
    font-weight: 400;
}

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

.banner_mo {
    display: none;
}
.Mo_pre {
    display: none;
}
.mo-br {
    display: none;
}




.top {
    height: 600px;
    max-width: 1200px;
    margin: 0 auto;
    border-radius: 20px;
    background-color: #eef1f6;
    padding: 80px 50px;
    background-image: url(../img/pc-img.png);
    background-position: bottom right;
    background-repeat: no-repeat;
    background-size: cover;
}
.top .top-content p {
    font-size: 40px;
    font-weight: 700;
    line-height: 1.5;
    margin-bottom: 10px;
}
.top .top-content pre {
    font-size: 21px;
    font-weight: 500;
    color: #7a7c88;
    line-height: 1.4;
}

.buttons {
    display: flex;
    justify-content: space-between;
    align-items: center;
    flex-wrap: wrap;
    gap: 30px;
}
.buttons .button-item {
    width: calc(100% / 2 - 15px);
    display: flex;
    flex-direction: column;
    justify-content: space-between;
    align-items: center;
    padding: 45px 30px;
    border-radius: 20px;
    border: 1px solid #e0e4e7;
    gap: 60px;
}
.buttons .button-item p {
    font-size: 22px;
    font-weight: 700;
    line-height: 1.2;
    text-align: center;
}
.buttons .button-item a {
    width: 100%;
    display: flex;
    justify-content: center;
    align-items: center;
    padding: 20px 0;
    border-radius: 10px;
    background-color: #d9ee53;
}
.buttons .button-item a span {
    font-size: 20px;
    font-weight: 400;
    margin-right: 10px;
}
.buttons .button-item a img {
    width: 28px;
}

.section.sub h2 {
    font-size: 30px;
    font-weight: 700;
    text-align: center;
    padding: 35px;
    margin-bottom: 50px;
    border-radius: 20px;
    background-color: #d9ee53;
}
.section.sub p.bold {
    font-size: 21px;
    font-weight: 500;
    color: #579bfe;
    margin-bottom: 5px;
}
.section.sub pre {
    font-size: 20px;
    font-weight: 400;
    line-height: 1.5;
    margin-bottom: 40px;
}
.section.sub pre span.point1 {
    font-size: 20px;
    font-weight: 400;
    color: #0493a0;
    margin-bottom: 5;
}
.section.sub .three-btn {
    display: flex;
    justify-content: space-between;
    align-items: center;
}
.section.sub .three-btn a {
    width: calc(100% / 3 - 15px);
    padding: 70px;
    border-radius: 20px;
    background-color: #eef1f6;
    font-size: 24px;
    font-weight: 700;
    text-align: center;
}




@media screen and (max-width: 1200px) {
    
}
@media screen and (max-width: 768px) {
    header {
        height: 10rem;
        padding: 1.5rem;
    }
    header .header {
        width: 100%;
        display: flex;
        flex-direction: column;
        align-items: center;
        justify-content: space-between;
    }
    header .header h1 {
        width: 9rem;
    }
    header .header nav {
        gap: 2rem;
        justify-content: space-between;
    }
    header .header nav a {
        font-size: 1.5rem;
        font-weight: 400;
    }
    
    main {
        padding: 0 1.5rem 5rem;
    }

    .banner {
        display: none;
    }
    .banner_mo {
        display: block;
    }
    .PC_pre {
        display: none;
    }
    .MO_pre {
        display: block;
    }
    .mo-br {
        display: block;
    }
    
    .top {
        background-image: none;
        height: fit-content;
        border-radius: 0;
        padding: 5rem 1.5rem;
        margin-bottom: 5rem;
    }
    .top .top-content p {
        font-size: 2.2rem;
        text-align: center;
    }
    .top .top-content pre {
        font-size: 1.4rem;
        text-align: center;
    }
    .top img {
        width: 100%;
        margin-top: 2rem;
    }

    .buttons {
        gap: 1rem;
    }
    .buttons .button-item {
        width: calc(100% / 2 - 0.5rem);
        height: 20rem;
        padding: 2.5rem 1.5rem;
        border-radius: 2rem;
        border: 0.1rem solid #e0e4e7;
        gap: 0;
    }
    .buttons .button-item p {
        font-size: 1.8rem;
    }
    .buttons .button-item a {
        padding: 2rem 0;
    }
    .buttons .button-item a span {
        font-size: 1.5rem;
        margin-right: 0.5rem;
    }
    .buttons .button-item a img {
        width: 2rem;
    }

    .section.sub h2 {
        font-size: 2rem;
        padding: 3rem 1.5rem;
        margin-bottom: 3rem;
        border-radius: 2rem;
    }
    .section.sub p.bold {
        font-size: 1.6rem;
        margin-bottom: 0.5rem;
    }
    .section.sub pre {
        font-size: 1.5rem;
        margin-bottom: 3rem;
    }
    .section.sub pre span.point1 {
        font-size: 1.5rem;
        margin-bottom: 0.5rem;
    }
    .section.sub .three-btn a {
        width: calc(100% / 3 - 0.7rem);
        height: 10rem;
        display: flex;
        justify-content: center;
        align-items: center;
        font-size: 1.6rem;
        line-height: 1.3;
        border-radius: 2rem;
        padding: 1rem 0;
    }
}