.w {
left: 50%;
transform: translateX(-50%);
    max-width: 2000px;
    margin-left: auto;
    margin-right: auto;
    overflow: hidden;
    position: absolute;
    width: 100%;
    height: 317vh;
}
.top_nav {
    height: 120px;
    background: linear-gradient(180deg,rgba(79, 35, 1, 0.7),rgba(34, 34, 34, 0));
}
.footer {
    background: #993012;
    color: #fff;
    padding: 230px 0 20px 0;
    font-size: 16px;
    position: absolute;
    top: 85%;
    height: 500px;
    font-family: "宋体";
    width: 100%;
}
.intro-section {
    position: relative;
    top: 220px;
    font-family: "宋体";
    color: #000;
    left: 79%;
    transform: translateX(-50%);

}
.intro-section .intro-title {
    font-size: 60px;
    font-weight: 800;
}
.intro-section .content {
    font-size: 20px;
    position: relative;
    left: -175px;

}
.intro-section .content p {
    letter-spacing: .1em;
}
.intro-section .content p:nth-child(1) {
    padding: 70px 0 40px 0;
}
.intro-section .liner {
    
    position: relative;
    width: 1600px;
    height: 600px;
    left: -450px;
    top: 100px;
}
.intro-section .one {
    position:absolute;
    width: 520px;
    height: 470px;
    left: 50%;
    transform: translateX(-50%);
    border-radius: 17px;
    overflow: hidden;
    cursor: pointer;
}
.intro-section .one .vi_1 {
    background-color: #fff;
    width: 520px;
    height: 470px;
    border-radius: 17px;
    position: absolute;
    left: 50%;
    transform: translateX(-50%);
    background: url('../images/img_vi_1.png') no-repeat;
    background-size: 520px 470px;
    overflow: hidden;
}
.intro-section .hidden1 {
    width: 520px;
    height: 470px;
    background: linear-gradient(0deg,#965F30,rgba(34, 34, 34, 0));
position: absolute;
    z-index: 100;
    cursor: pointer;
    border-radius: 17px;
    transition: all 0.6s ease-in-out;
}
.intro-section .liner .one:hover  .hidden1{
    transform: translateY(450px);
    opacity: 0;
}
button {
    width: 100px;
    height: 40px;
    background-color: #90290C;
    border-radius: 10px;
    position: absolute;
    top: 20px;
    left: 74%;
    z-index: 1000;
    cursor: pointer;
    color: #fff;
    font-weight: 600;
    font-family: "宋体";
    font-size: 20px;
    transition: all .4s ease;
}
button:hover {
    color: #cdcdcd;
    background-color: #92351c;
    transform: scale(1.03);
}
button img {
    width: 10px;
    position: relative;
    left: 3px;
    top: -2px; 
}
.one p {
z-index: 1000;
position: relative;
font-size: 35px;
color: #ffffff;
font-weight: 500;
top: 460px;
}
.one .small {
    font-size: 18px;
    left: 15px;
}

.intro-section .two {
    width: 280px;
    height: 390px;
    border-radius: 17px;
    position: absolute;
    cursor: pointer;
    left: 230px;
    top: 20px;
}
.intro-section .two .vi_2 {
    width: 280px;
    height: 390px;
    background: url('../images/img_vi_2.png') no-repeat;
    z-index: 100;
    background-size: 280px 390px;
}
.intro-section .two p {
    z-index: 100;
    color: #000;
    font-size: 25px;
    position: absolute;
    left: 50px;
    top: 400px;
    font-weight: 700;

}
.intro-section .three  {
    width: 280px;
    height: 390px;
    border-radius: 17px;
    position: absolute;
    cursor: pointer;
    left: 1090px;
    top: 20px;
}
.intro-section .three .vi_3{
    width: 280px;
    height: 390px;
    background: url('../images/img_vi_3.png') no-repeat;
    z-index: 100;
    background-size: 280px 390px;
}
.intro-section .three p {
    z-index: 100;
    color: #000;
    font-size: 25px;
    position: absolute;
    left: 60px;
    top: 400px;
    font-weight: 700;
}
.intro-section .liner .ico_1 {
    width: 70px;
    height: 70px;
    position: absolute;
    border-radius: 50%;
    background: url('../images/ico_4.png') no-repeat;
    background-position: -20px -15px;
    background-size: 102px 102px;
    z-index: 100;
    top: 160px;
    left: 80px;
    cursor: pointer;
}
.intro-section .liner .ico_2 {
    width: 90px;
    height: 90px;
    position: absolute;
    border-radius: 50%;
    background: url('../images/ico_5.png') no-repeat;
    z-index: 100;
    top: 150px;
    left: 1430px;
    cursor: pointer;
}

.intro-section .one,
.intro-section .two,
.intro-section .three {
    position: absolute;
    top: 20px;
    transition: left 0.6s cubic-bezier(0.4,0,0.2,1);
}

/* 位置类，left/center/right 控制卡片位置 */
.liner .left   { left: 230px;    z-index: 2;   transform: scale(.9); transition: all .6s ease-in-out;}
.liner .center { left: 50%;      transform: translateX(-50%); z-index: 10; transition: all .6s ease-in-out; }
.liner .right  { left: 1090px;   z-index: 2;   transform: scale(.9);   transition: all .6s ease-in-out; }

/* 默认卡片文字为黑色 */
.intro-section .one p,
.intro-section .one .small,
.intro-section .two p,
.intro-section .three p {
    color: #222;
    transition: color 0.4s, transform 0.5s cubic-bezier(0.4,0,0.2,1);
    transform: translateY(0);
}

/* 中间卡片文字变白并上滑 */
.liner .center p,
.liner .center .small {
    color: #fff !important;
    transform: translateY(-100px);
    transition: color 0.4s, transform 0.5s cubic-bezier(0.4,0,0.2,1);
}