*{
    /* 初始化 */
    margin: 0;
    padding: 0;
    box-sizing: border-box;
}
body{
    /* 100%窗口高度 */
    min-height: 100vh;   
    /* 渐变背景 */
    background-image: linear-gradient(to right, #f83600 0%, #f9d423 100%);
    display: flex;
    justify-content: center;
    overflow: hidden;
    align-items: center;
    
}






header{
    position: fixed;
    top: 0;
    left: 0;
    right: 0;
    width: 100%;
    z-index: 10;
    padding: 20px 100px;
    box-sizing: border-box;
    display: flex;
    justify-content: space-between;
    align-items: center;
    color: #fff;
    overflow: hidden;
    border-bottom: double white 1px;
    /*border-radius: 30px;*/
    background-color: rgba(0, 0, 0, 0.5);


}
.nav-header{
    display: flex;
    flex-direction:row;
}
.navbar-brand{
    font-family: '宋体';
    font-size: 30px;
    font-weight: bold;
    height: 30px;
    color: #fff;
}

.font-special{
    font-family: '宋体'，'新宋体'，sans-serif;
}
.active{
    background: #497271
}
header ul {
    list-style: none;
    display: flex;
    justify-content: center;
    align-items: center;
}
header ul li{
    font-weight: 400px;
    margin-left: 15px;
    transition: all .5s linear;
    padding: 5px 10px;
    border-radius: 20px;
}
header ul li:hover{
    background: #497271;
    color: #2b1055;
}
a:link,a:visited{
    color: #fff;
    text-decoration: none;
}



.container{
    width:600px;
    height: 400px;
    
    perspective: 1000px;
    position: relative;
}
.cards-wrap{
    position: absolute;
    width: 100%;
    height: 100%;
    
    transform-style: preserve-3d;
    transform: rotateY(0) translateZ(-700px);
    animation: carousel 10s infinite cubic-bezier(0.77,0,0.175,1);
    
}


.cards-wrap:hover{
    animation-play-state: paused;
}
.cards{
    position: absolute;
    left: 0;
    right: 0;
    top: 0;
    bottom: 0;
    width: 100%;
    height: 100%;
    display: flex;
    justify-content: center;
    align-items: center;
}
.cards:nth-child(1){
    
    transform: rotateY(0) translateZ(700px);
}
.cards:nth-child(2){
    
    transform: rotateY(72deg) translateZ(700px);
}
.cards:nth-child(3){
    
    transform: rotateY(144deg) translateZ(700px);

}
.cards:nth-child(4){
    
    transform: rotateY(216deg) translateZ(700px);

}
.cards:nth-child(5){
   
    transform: rotateY(288deg) translateZ(700px);

}
@keyframes carousel{
    0%{
        transform: translateZ(-700px) rotateY(0);
    }
    20%{
        transform: translateZ(-700px) rotateY(-72deg);
    }
    40%{
        transform: translateZ(-700px) rotateY(-144deg);
    }
    60%{
        transform: translateZ(-700px) rotateY(-216deg);
    }
    80%{
        transform: translateZ(-700px) rotateY(-288deg);
    }
    100%{
        transform: translateZ(-700px) rotateY(-360deg);
    }
}



.container .card{
    position: relative;
    max-width: 600px;
    height: 300px;
    background-color: #fff;
    margin: 30px 15px;
    padding: 20px 15px;
    border-radius: 5px;
    /* 阴影 */
    box-shadow: 0 5px 200px rgba(0,0,0,0.5);
    /* 动画过渡 */
    transition: 0.3s ease-in-out;
}
.container .card:hover{
    height: 600px;
}
.container .card .img-box{
    position: relative;
    width: 550px;
    height: 300px;
    border-radius: 5px;
    /* 溢出隐藏 */
    overflow: hidden;
    top: -60px;
    left: 20px;
    /* 阴影 */
    box-shadow: 0 5px 20px rgba(0,0,0,0.2);
    z-index: 1;
}
.container .card .img-box img{
    width: 100%;
}
.container .card .text-box{
    position: relative;
    margin-top: -140px;
    padding: 10px 15px;
    text-align: center;

    color: #111;
    /* 设置元素不可见 */
    visibility: hidden;
    /* 不透明度 */
    opacity: 0;
    transition: 0.3s ease-in-out;
}
.container .card .text-box p{
    text-align: left;
    line-height: 25px;
    margin-top: 10px;
    font-size: 15px;
    color: #555;
}
.container .card:hover .text-box{
    /* 鼠标移入，设置元素可见 */
    visibility: visible;
    opacity: 1;
    margin-top: -40px;
    /* 动画延迟0.2秒 */
    transition-delay: 0.2s;
}

p{
    font-family: '宋体';
    font-size: larger;
    font-weight: bold;
}