html {
    width: 100%;
    height: 100%;
    margin: 0;
    padding: 0;
}

body {
    width: 100%;
    height: 100%;
    margin: 0;
    padding: 0;
}

.header {
    width: 100%;
    height: 4rem;
    font-size: 1rem;
    background-image: url("images/header_background.png");
    position: fixed;
    top: 0;
    left: 0;
    z-index: 99999;
}

.header .icon {
    position: absolute;
    width: 12rem;
    left: 5rem;
}

.header img {
    width: 100%;
}

.header .nav-div {
    height: 1rem;
    line-height: 4rem;
}

.header .nav {
    position: absolute;
    margin: auto;
    text-align: center;
    -webkit-transition: 0.5s;
    -moz-transition: 0.5s;
    transition: 0.5s;
    right: 5rem;
    width: 40rem;
}

.header .nav a {
    display: inline-block;
    text-align: center;
    -webkit-transition: 0.3s, color 0.5s;
    -moz-transition: 0.3s, color 0.5s;
    transition: 0.3s, color 0.5s;
    text-decoration: none;
    color: white;
}

.header .nav .nav-box {
    padding: 0 30px;
    height: 25px;
    display: inline-block;
}

.main {
    min-height: calc(100% - 10rem);
    max-width: 100%;
}

.main img {
    max-width: 100%;
}

.main-1, .main-2, .main-3 {
    text-align: center;
}

.main h3 {
    margin-top: 0;
    color: #252525;
}


.main h4 {
    margin: 0;
    font-size: 13px;
    color: #232323;
    font-weight: bold;
    display: inline-block;
}

.main p {
    font-size: 13px;
    color: #494848;
}

.main, .main-main, .main-product, .main-about_us, .main-join_us {
    width: 100%;
    position: relative;
}

.main .main-main .main-1 {
    width: 100%;
    background: url("images/main_1.png");
    background-size: cover;
    height: 43rem;
    margin-top: 2rem;
}

.main .main-main .main-2 {
    background: url("images/background.png");
    width: 100%;
    height: 8rem;
    position: relative;
}

.main .main-main .main-2 .main-2-content {
    position: absolute;
    top: -4rem;
    width: 52rem;
    left: calc((100% - 52rem) / 2);
}

.main .main-main .main-2 > img {
    width: 10rem;
}

.main .main-about_us .main-1 {
    width: 100%;
    background: url("images/about_us_1.png");
    background-size: cover;
    height: 30rem;
}

.main .main-about_us .main-2 {
    background: url("images/background.png");
    width: 100%;
    height: 30rem;
}

.main .main-about_us .main-2 .main-2-1 {
    margin: 0 auto;
    width: 55rem;
    padding-top: 20px;
}

.main .main-about_us .main-2 .main-2-2 {
    margin: 0 auto;
    padding-top: 20px;
    width: 55rem;
    height: 10rem;
}

.main .main-product .main-1 {
    width: 100%;
    background: url("images/product_1.png");
    background-size: cover;
    height: 34rem;
}

.main .main-product .main-2 {
    background: url("images/background.png");
    width: 100%;
    height: 68rem;
}

.main .main-product .main-2-content {
    width: 60rem;
    margin: 0 auto;
    padding-top: 20px;
    display: flex;
}

.main .main-product .main-2-content > div {
    display: inline-block;
}

.main .main-product .main-2-content .main-2-1 {
    width: 35rem;
    text-align: left;
    line-height: 2
}

.main .main-product .main-2-content p {
    margin: 0;
}

.main .main-product .main-2-content .main-2-1 h3 {
    text-align: center;
}

.main .main-product .main-2-content .main-2-2 {
    width: 20rem;
}

.main .main-join_us .main-1 {
    width: 100%;
    background: url("images/join_us_1.png");
    background-size: cover;
    height: 30rem;
}

.main .main-join_us .main-2 {
    background: url("images/background.png");
    width: 100%;
    height: 19rem;
    padding-top: 3rem;
}

.footer {
    width: 100%;
    background: url("images/footer_background.png");
    height: 10rem;
    position: relative;
}

.footer .footer_1 {
    margin: 0 auto;
    width: 9rem;
    height: 5rem;
}

.footer .footer_1 > img {
    width: 9rem;
    height: 3rem;
    margin-top: 0.5rem
}

.footer .footer_2 {
    text-align: center;
    color: #b9b9b9;
    font-size: 10px;
}

.footer a {
    margin: 0;
    cursor: pointer;
    text-decoration: unset;
    display: inline-block;
    color: rgb(49, 170, 226);
}

@media (max-width: 1000px) {
    .main .main-main .main-1, .main .main-about_us .main-1, .main .main-product .main-1, .main .main-join_us .main-1 {
        background-size: contain;
        height: 22.4rem;
    }

    .main .main-main .main-2, .main .main-about_us .main-2, .main .main-product .main-2, .main .main-join_us .main-2 {
        height: 76rem;
    }
}