@import url('https://fonts.googleapis.com/icon?family=Material+Icons');
/*轮播图必须放在顶部*/

/*整体滚动*/
* {
    margin: 0;
    padding: 0;
}

html, body {
    width: 100%;
    height: 100vh;
    overflow: hidden;
}

.scrollContainer {
    position: relative;
    transition: 1s;
    /*width: 100%;*/
    height: 100vh;
    overflow-y: auto;
    /*overflow-x: hidden;*/
    margin-right: calc(100% - 100vw);
}

.section {
    position: relative;
    width: 100vw;
    height: 100vh;
}

/*整体滚动结束*/


/*答案之书+翻书*/

.h1_container {
    position: absolute;
    left: 40%;
    top: 20%;
    transform: translate(-50%, -50%);
}

.h1_container h1 {
    font-size: 4em;
    color: rgba(255, 255, 255, 0.3);
    background-image: url("img/redcloud.jpeg");
    text-transform: uppercase;
    letter-spacing: 8px;
    -webkit-background-clip: text;
    font-weight: 500;
    animation: wave 30s linear infinite;
    white-space: nowrap; /*不自动换行*/
}


@keyframes wave {
    from {
        background-position: 0 0;
    }
    to {
        background-position: 1000px 0;
    }

}

#sentence {
    color: black;
    font-size: 25px;
    font-style: italic;
    position: absolute;
    top: 40%;
    left: 28%;
    text-align: center;
}

.button-container {
    position: absolute;
    text-align: center;
    left: 50%;
    top: 80%;
    transform: translate(-50%, -50%);
    font-size: 24px;
    cursor: pointer;
    border-radius: 24px;
}


#counsel {
    margin: 10px;
    width: 200px;
    height: 50px;
}

#counsel:active {
    margin: 12.5px;
    width: 193px;
    height: 45px;
}

.book {
    width: 150px;
    height: 200px;
    background-color: #fff;

    /*开启3d效果*/
    transform-style: preserve-3d;

    /*设置视距*/
    perspective: 2000px;

    /*设置阴影*/
    box-shadow: inset 300px 0 30px rgba(0, 0, 0, 0.2),
    0 10px 100px rgba(0, 0, 0, 0.3);

    /*动画过渡*/
    transition: 1s;
    position: absolute;
    right: 10%;
    bottom: 15%;
}

/*鼠标移入 阴影变化加旋转*/
.book:hover {
    transform: rotate(-10deg);
    box-shadow: inset 20px 0 30px rgba(0, 0, 0, 0.2),
    0 10px 100px rgba(0, 0, 0, 0.3);
}

.book::before {
    content: "";
    /*绝对定位*/
    position: absolute;
    left: 0;
    top: -5px;
    width: 100%;
    height: 5px;
    background-color: var(--primary-color-lighter);
    /*设置旋转元素的基点位置*/
    transform-origin: bottom;
    /*沿x轴倾斜-45度*/
    transform: skew(-45deg);
}

.book::after {
    content: "";
    position: absolute;
    top: 0;
    right: -5px;
    width: 5px;
    height: 100%;
    background-color: var(--primary-color-darkest);
    transform-origin: left;
    transform: skewY(-45deg);
}

/*封面*/
.book .cover {
    width: 100%;
    height: 100%;
    background-color: var(--primary-color);
    display: flex;
    justify-content: center;
    align-items: center;
    position: relative;
    transform-origin: left;
    transition: 1s;
}

.book .cover span {
    position: absolute;
    right: 30px;
    top: 30px;
    background-color: #fff;
    font-size: 20px;
    /*font-family: "隶书";*/
    /*竖向文本*/
    writing-mode: vertical-lr;
    padding: 10px 5px 5px 5px;
    /*字间距*/
    letter-spacing: 5px;
}

.book:hover .cover {
    transform: rotateY(-135deg);
}

.book .bookContent {
    width: 100%;
    height: 100%;
    position: absolute;
    top: 0;
    left: 5px;
    z-index: -1;
    font-size: 12px;
    text-indent: 2em;
    /*font-family: "隶书";*/
    line-height: 20px;
    /*letter-spacing: 5px;*/
    display: flex;
    flex-direction: column;
    justify-content: center;
    align-items: center;
}

/*第一部分截止*/

/*轮播图*/

#sectionS2 {
    display: flex;
    flex-direction: column;
    justify-content: center;
    align-items: center;
}

* {
    margin: 0;
    padding: 0;
}

.slide-box {
    position: relative;
    margin: 30px auto;
    height: 300px;
    width: 100%;
    max-width: 1200px;
    min-width: 700px;
}

.banner-box {
    position: relative;
    height: 100%;
    width: 100%;
}

.banner-item {
    position: absolute;
    bottom: 0;
    left: 50%;
    transform: translateX(-50%);
    width: 500px;
    height: 90%;
    background-color: #000;
    box-sizing: border-box;
    border-radius: 10px;
    overflow: hidden;
    transition: all 0.5s;
    z-index: 0;
}

.banner-item > img {
    display: block;
    width: 100%;
    height: 100%;
    opacity: 0.5;
    transition: opacity 0.5s;
    object-fit: cover;
}

.banner-item.left {
    left: 0;
    transform: translateX(0);
    z-index: 50;
}

.banner-item.right {
    left: 100%;
    transform: translateX(-100%);
    z-index: 50;
}

.banner-item.middle {
    width: 550px;
    height: 100%;
    z-index: 100;
}

.banner-item.middle > img {
    opacity: 1;
}

.slide-left-btn, .slide-right-btn {
    position: absolute;
    top: 50%;
    z-index: 200;
    width: 40px;
    height: 40px;
    font-weight: 900;
    color: #b4b4b4;
    border: none;
    background: none;
}

.slide-left-btn:hover, .slide-right-btn:hover {
    color: #fff;
}

.slide-left-btn {
    left: 1%;
}

.slide-right-btn {
    right: 1%;
}

.pagination-box {
    margin-top: 10px;
    width: 100%;
    display: flex;
    justify-content: center;
}

.pagination-box > span {
    width: 20px;
    height: 6px;
    border-radius: 3px;
    margin: 0 4px;
    background-color: #b4b4b4;
}

.pagination-box > span.chose {
    background-color: var(--primary-color);
}

/*Four Cards*/
.containerForFour {
    position: relative;
    align-items: center;
    margin-top: 0;
    transition: 0.5s;
    display: flex;
    flex-wrap: wrap;
    justify-content: center;
}

@media screen and (min-width: 1280px) {
    .containerForFour{
        width: 1280px;
    }
}

/*FirstCard*/
.containerForFour .FirstCard {
    width: 500px;
    height: 500px;
    display: flex;
    justify-content: center;
    align-items: center;
    transition: 0.5s;
    left: 5%;
    top: 1%;
    /*设置初始大小为0.7*/
    transform: scale(0.8);
}

.containerForFour .FirstCard:hover {
    filter: blur(0px);
    transform: scale(1);
}

.containerForFour .FirstCard:before {
    content: '';
    position: absolute;
    width: 100%;
    height: 100%;
    background: linear-gradient(to bottom, var(--primary-color), transparent);
    border-radius: 50px;
    z-index: 1;
    transition: 0.5s;
}

.containerForFour .FirstCard:hover:before {
    background: #FFF;
    transform: scale(1.15);
    box-shadow: 0 5px 15px rgba(0, 0, 0, .2);
}

.containerForFour .FirstCard .content {
    text-align: center;
    z-index: 2;
    padding: 0 20px;
    transition: 0.5s;
}

.containerForFour .FirstCard:hover .content {
    color: var(--primary-color-darker);
}

.containerForFour .FirstCard .text_communist_c {
    display: inline-block;
    color: white;
    font-size: 40px;
    margin-top: -20px;
    position: relative;
    top: 50%;
    transform: translateY(-50%);
    z-index: 99;
}

.containerForFour .FirstCard:hover .text_communist_c {
    color: var(--dark);
    font-size: 20px;
    font-weight: bold;
}

.containerForFour .FirstCard .text_content_c {
    display: inline-block;
    color: var(--primary-color-darkest);
    font-size: 10px;
    text-align: justify;
    line-height: 2;
    z-index: 99;
}

.containerForFour .FirstCard:hover .text_content_c {
    color: var(--primary-color);
    font-size: 16px;
    text-align: justify;
}

/*SecondCard*/
.containerForFour .SecondCard {
    width: 500px;
    height: 500px;
    display: flex;
    justify-content: center;
    align-items: center;
    transition: 0.5s;
    right: 5%;
    top: 1%;
    /*设置初始大小为0.7*/
    transform: scale(0.8);
}

.containerForFour .SecondCard:hover {
    filter: blur(0px);
    transform: scale(1);
}

.containerForFour .SecondCard:before {
    content: '';
    position: absolute;
    width: 100%;
    height: 100%;
    background: linear-gradient(to bottom, var(--primary-color), transparent);
    border-radius: 50px;
    z-index: 1;
    transition: 0.5s;
}

.containerForFour .SecondCard:hover:before {
    background: #FFF;
    transform: scale(1.15);
    box-shadow: 0 5px 15px rgba(0, 0, 0, .2);
}

.containerForFour .SecondCard .content {
    text-align: center;
    z-index: 2;
    padding: 0 20px;
    transition: 0.5s;
}

.containerForFour .SecondCard:hover .content {
    color: var(--primary-color-darker);
}

.containerForFour .SecondCard .text_communist_c {
    display: inline-block;
    color: white;
    font-size: 40px;
    margin-top: -20px;
    position: relative;
    top: 50%;
    transform: translateY(-50%);
    z-index: 99;
}

.containerForFour .SecondCard:hover .text_communist_c {
    color: var(--dark);
    font-size: 20px;
    font-weight: bold;
}

.containerForFour .SecondCard .text_content_c {
    display: inline-block;
    color: var(--primary-color-darkest);
    font-size: 10px;
    text-align: justify;
    line-height: 2;
    z-index: 99;
}

.containerForFour .SecondCard:hover .text_content_c {
    color: var(--primary-color);
    font-size: 16px;
    text-align: justify;
}


/*ThirdCard*/
.containerForFour .ThirdCard {
    width: 500px;
    height: 500px;
    display: flex;
    justify-content: center;
    align-items: center;
    transition: 0.5s;
    left: 5%;
    top: 30%;
    bottom: 5%;
    transform: scale(0.8);
}

.containerForFour .ThirdCard:hover {
    filter: blur(0px);
    transform: scale(1);
}

.containerForFour .ThirdCard:before {
    content: '';
    position: absolute;
    width: 100%;
    height: 100%;
    background: linear-gradient(to bottom, var(--primary-color), transparent);
    border-radius: 50px;
    z-index: 1;
    transition: 0.5s;
}

.containerForFour .ThirdCard:hover:before {
    background: #FFF;
    transform: scale(1.15);
    box-shadow: 0 5px 15px rgba(0, 0, 0, .2);
}

.containerForFour .ThirdCard .content {
    text-align: center;
    z-index: 2;
    padding: 0 20px;
    transition: 0.5s;
}

.containerForFour .ThirdCard:hover .content {
    color: var(--primary-color-darker);
}

.containerForFour .ThirdCard .text_communist_c {
    display: inline-block;
    color: white;
    font-size: 40px;
    margin-top: -20px;
    position: relative;
    top: 50%;
    transform: translateY(-50%);
    z-index: 99;
}

.containerForFour .ThirdCard:hover .text_communist_c {
    color: var(--dark);
    font-size: 20px;
    font-weight: bold;
}

.containerForFour .ThirdCard .text_content_c {
    display: inline-block;
    color: var(--primary-color-darkest);
    font-size: 10px;
    text-align: justify;
    line-height: 2;
    z-index: 99;
}

.containerForFour .ThirdCard:hover .text_content_c {
    color: var(--primary-color);
    font-size: 16px;
    text-align: justify;
}

/*FourthCard*/
.containerForFour .FourthCard {
    width: 500px;
    height: 500px;
    display: flex;
    justify-content: center;
    align-items: center;
    transition: 0.5s;
    right: 5%;
    top: 30%;
    bottom: 5%;
    transform: scale(0.8);
}

.containerForFour .FourthCard:hover {
    filter: blur(0px);
    transform: scale(1);
}

.containerForFour .FourthCard:before {
    content: '';
    position: absolute;
    width: 100%;
    height: 100%;
    background: linear-gradient(to bottom, var(--primary-color), transparent);
    border-radius: 50px;
    z-index: 1;
    transition: 0.5s;
}

.containerForFour .FourthCard:hover:before {
    background: #FFF;
    transform: scale(1.15);
    box-shadow: 0 5px 15px rgba(0, 0, 0, .2);
}

.containerForFour .FourthCard .content {
    text-align: center;
    z-index: 2;
    padding: 0 20px;
    transition: 0.5s;
}

.containerForFour .FourthCard:hover .content {
    color: var(--primary-color-darker);
}

.containerForFour .FourthCard .text_communist_c {
    display: inline-block;
    color: white;
    font-size: 40px;
    margin-top: -20px;
    position: relative;
    top: 50%;
    transform: translateY(-50%);
    z-index: 99;
}

.containerForFour .FourthCard:hover .text_communist_c {
    color: var(--dark);
    font-size: 20px;
    font-weight: bold;
}

.containerForFour .FourthCard .text_content_c {
    display: inline-block;
    color: var(--primary-color-darkest);
    font-size: 10px;
    text-align: justify;
    line-height: 2;
    z-index: 99;
}

.containerForFour .FourthCard:hover .text_content_c {
    color: var(--primary-color);
    font-size: 16px;
    text-align: justify;
}

/*四个响应式卡片编辑结束*/