* {
    margin: 0;
    padding: 0;
    font-family: sans-serif, Verdana, Geneva, Tahoma, '微软字体';
}

html {
    scroll-behavior: smooth;
}

a {
    text-decoration: none;
}

ul {
    list-style: none;
}

img {
    display: block;
    width: 100%;
    object-fit: cover;
}

.w {
    max-width: 1200px;
    margin: 0 auto;
    box-sizing: border-box;
    padding: 0 20px;
}

.flex {
    display: flex;
}

.flex-b {
    display: flex;
    justify-content: space-between;
    align-items: center;
}

.header {
    line-height: 50px;
    box-shadow: 0 15px 15px #33333310;
    background-color: #fff;
    position: sticky;
    top: 0;
    z-index: 999999;
}

.header a {
    color: #333;
}

.header .nav a {
    margin-left: 20px;
}

.header .nav a.active,
.header .nav a:hover {
    color: red;
    border-bottom: 2px solid red;
}

.header .logo {
    font-size: 18px;
    font-weight: bold;
}

@media screen and (max-width: 768px) {
    .header .w {
        flex-direction: column;
    }

    .header .nav {
        justify-content: space-between;
        align-items: center;
        width: 100%;
    }

    .header .nav a {
        display: block;
        line-height: 35px;
        border-bottom: 2px solid #fff;
        margin-left: 0;
    }
}

.segmentation {
    margin: 0 auto;
    display: flex;
    flex-direction: column;
    align-items: center;
    justify-content: center;
    padding: 60px 0 20px;
}

.segmentation p:nth-of-type(1) {
    font-weight: bolder;
    font-size: 28px;
    color: #333;
    letter-spacing: 3px;
}

.segmentation p:nth-of-type(2) {
    font-size: 18px;
    color: #999;
    text-align: center;
}

.segmentation span {
    display: block;
    width: 30px;
    height: 4px;
    border-radius: 5px;
    background-color: #da0000;
    margin: 10px 0;
}

.introduce {
    display: flex;
    flex-direction: column;
    align-items: center;
    justify-content: center;
    margin-bottom: 24px;
}

.introduce img {
    width: 100%;
    height: 400px;
    object-fit: cover;
    border-radius: 10px;
}

.introduce p:nth-of-type(1) {
    font-size: 24px;
    font-weight: bold;
    color: #333;
    margin: 10px 0;
}

.introduce p:nth-of-type(2) {
    font-size: 16px;
    color: #999;
    text-align: center;
    line-height: 24px;
    padding: 0 50px;
}




.introduce2 {
    display: flex;
    justify-content: space-evenly;
    align-items: center;
    background-color: #fff;
    box-shadow: 0 0 15px #33333333;
    border-radius: 10px;
    padding: 50px;
    margin-bottom: 50px;
}

.introduce2 img {
    width: 300px;
    height: 200px;
    margin-left: 50px;
    border-radius: 10px;
}

.introduce2Info p:nth-of-type(1) {
    font-size: 24px;
    font-weight: bold;
    line-height: 50px;
}

.introduce2Info p:nth-of-type(2) {
    line-height: 25px;
}

@media screen and (max-width: 768px) {
    .introduce2 {
        flex-direction: column;
        align-items: center;
        text-align: center;
    }

    .introduce2 img {
        width: 100%;
        margin-top: 20px;
        margin-left: 0;
    }
}



.introduce3 {
    display: flex;
    margin-bottom: 50px;
}

.introduce3-img {
    display: flex;
    flex-wrap: wrap;
    width: 50%;
    border-radius: 10px;
    overflow: hidden;
    justify-content: space-between;
}


.introduce3-img img {
    width: 49%;
    height: 300px;
    object-fit: cover;
}

.introduce3-img img:nth-of-type(3) {
    width: 100%;
    margin-top: 10px;
}


.introduce3-text {
    width: 50%;
    display: flex;
    align-items: center;
    justify-content: center;
    padding: 0 50px;
    flex-direction: column;
}

.introduce3-text p {
    width: 100%;
}

.introduce3-text p:nth-of-type(1) {
    font-size: 24px;
    font-weight: bold;
    margin-bottom: 20px;
    color: #333;
}

.introduce3-text p {
    font-size: 14px;
    margin-bottom: 20px;
    line-height: 34px;
}


@media screen and (max-width: 768px) {
    .introduce3 {
        flex-direction: column;
    }

    .introduce3-img {
        width: 100%;
    }

    .introduce3-text {
        width: 100%;
        box-sizing: border-box;
        padding: 0 20px;
        margin-top: 20px;
    }
}



.card {
    width: 32%;
    height: 390px;
    box-shadow: 0 0 15px #33333333;
    border-radius: 10px;
    overflow: hidden;
}

.cardImg {
    display: block;
    width: 100%;
    height: 200px;
    overflow: hidden;
}

.cardImg img {
    display: block;
    width: 100%;
    height: 200px;
    object-fit: cover;
    transition: .3s ease-in-out;
}

.cardImg img:hover {
    transform: scale(1.1);
}

.cardTitle {
    display: block;
    line-height: 40px;
    font-size: 24px;
    padding: 0px 15px;
    margin-top: 10px;
    color: #333;
}

.cardTitle:hover {
    color: #da0000;
}

.cardText {
    padding: 5px 15px 10px;
    line-height: 23px;
}

@media screen and (max-width: 768px) {
    #method .flex-b {
        flex-direction: column;
    }

    .card {
        width: 100%;
        margin-bottom: 20px;
    }
}

.introduce4 {
    display: flex;
    flex-direction: column;
    justify-content: space-between;
    align-items: center;
    margin-bottom: 50px
}

.introduce4>div {
    display: flex;
    justify-content: space-between;
    align-items: center;
}

.introduce4>div img {
    width: 700px;
    height: 400px;
    object-fit: cover;
}

.introduce4>div div {
    width: 30%;
    padding: 30px;
}

.introduce4>div:nth-of-type(2) {
    background-color: #eee;
}


.introduce4 p {
    font-size: 14px;
}


@media screen and (max-width: 1200px) {
    .introduce4>div {
        flex-direction: column;
    }

    .introduce4>div>div {
        order: 2;
        width: 100%;
        box-sizing: border-box;
        padding: 20px;
    }

    .introduce4>div img {
        width: 100%;
    }
}


.footer {
    background-color: #F2F2F2;
    padding: 50px 0;
    margin-top: 50px;
}

.footer .avatar {
    display: block;
    width: 50px;
    height: 50px;
    border-radius: 50%;
    margin: 0 auto;
    margin-bottom: 30px;
    transition: .5s ease;
}

.footer .avatar:hover {
    transform: rotate(360deg);
}

.footer .nav {
    display: flex;
    justify-content: center;
    align-items: center;
}

.footer .nav a {
    margin: 0 30px;
    color: #333;
}

.footer .line {
    background-color: #ddd;
    height: 1px;
    margin: 20px 0;
}

.footer .info {
    text-align: center;
    color: #666;
}

@media screen and (max-width: 768px) {
    .footer .nav {
        justify-content: space-between;
        align-items: center;
        width: 100%;
    }

    .footer .nav a {
        margin: 0;
    }
}



.animation1,
.animation2,
.animation3 {
    transition: .3s ease;
}

.animation1:hover {
    transform: translate(0px, -10px);
    box-shadow: 0 15px 15px #33333350;
}

.animation2:hover {
    transform: scale(1.1);
    box-shadow: 0 0px 15px #33333350;
}

.animation3 {
    filter: blur(2px);
}

.animation3:hover {
    filter: blur(0px);
    transform: scale(1.02);
    box-shadow: 0 15px 25px #33333350;
}