/* 清楚默认格式 */
* {
    margin: 0px;
    padding: 0px;
    list-style: none;
}

/* 清除浮动 */
.clear {
    clear: both;
}

/* 头部导航栏 */
header {
    height: 110px;
    position: relative;
    z-index: 99;
    border-bottom: 1px solid #C8C8C8;
}

.heard {
    width: 1200px;
    height: 110px;
    margin: 0 auto;
}

.heard_left {
    float: left;
    height: 110px;
}

.logo {
    float: left;
    width: 140px;
    margin-right: 30px;
}

.logo img {
    width: 100%;
}

.heard_right {
    float: right;
    line-height: 110px;
}

.heard_right a {
    font-weight: bolder;
    color: black;
    text-decoration: none;
}

.heard_right a:hover {
    text-decoration: underline;
    color: #FF3030;
}


.heard_right input {
    width: 160px;
    height: 40px;
    background: #F5F5F5;
    border: 0px;
    border-radius: 20px;
    padding: 0px 10px;
    margin-right: 10px;
}

.heard_right input::placeholder {
    color: #999E9C;
}

nav {
    float: left;
    height: 100%;
}

.rop-down-menu {
    display: inline-block;
}

nav ul>li {
    float: left;
    height: 110px;
    line-height: 110px;
    margin-right: 30px;

}

nav ul>li>a {
    text-decoration: none;
    color: black;
    font-weight: bolder;
}

nav ul>li>a:hover {
    color: #FF3030;
    text-decoration: underline;
}


.drop-down-menu {
    width: 64px;
}

.drop-down-menu>a {
    color: #000;
    font-weight: bolder;
    text-decoration: none;
}

.drop-down-menu:hover>a {
    color: #FF3030;
    text-decoration: underline;
}

.drop-box {
    display: none;
}

.rop-down-menu-box:hover .drop-box {
    display: block;
    border-top: 4px solid #FF3030;
    position: relative;
    top: -10px;
    background-color: #fff;
    box-shadow: 0 5px 20px rgba(0, 0, 0, 0.15);
    width: 200px;
    line-height: 30px;
}

.drop-box a {
    display: block;
    color: #878787;
    text-decoration: none;
    padding: 10px;
    font-weight: bolder;
}

.drop-box a:hover {
    color: #000;
    text-decoration: underline;
}

/* banner栏目 */
#banner {
    position: relative;
    height: 540px;
    margin: 0 auto;
    background: url(../images/banner.png) no-repeat;
    background-size: cover;
    background-position: center;
    width: 100%;
    /* 设置最小宽度为 1100px */
}

.little_box {
    position: relative;
    width: 1400px;
    margin: 0 auto;
}

.banner_text {
    width: 700px;
    color: #fff;
    float: left;
    margin-left: 145px;
    margin-top: 145px;
}

.banner_text p {
    line-height: 30px;
    margin-top: 30px;
}

.index_more {
    width: 126px;
    height: 40px;

}

.index_more a {
    display: inline-block;
    width: 100%;
    height: 100%;
    text-align: center;
    letter-spacing: 4px;
    background-color: #FF3030;
    color: #fff;
    text-decoration: none;
    line-height: 40px;
    border-radius: 10px;
    margin-top: 20px;
    font-size: 14px;
}

.index-img {
    float: right;
    width: 200px;
    margin-right: 150px;
    margin-top: 100px;
    transition: transform 0.3s;
    cursor: pointer;
    /* 添加过渡效果，实现平滑的动画 */
}

.index-img img {
    width: 100%;
}

/* 当鼠标悬停时，放大图片 */
.index-img:hover {
    transform: scale(1.1);
    /* 将图片放大1.1倍 */
}

/* <!-- 壁画专题 --> */
#Mural_Special_Topic {
    position: relative;
    width: 100%;
    padding: 50px 0px;
    background: url(../images/bg1.png);
}

.bg2 {
    top: 0px;
    width: 300px;
    position: absolute;
    display: block;
    width: 100%;
    margin: 0 auto;
    text-align: center;
}

.bg2 img {
    width: 300px;
}

.Mural_Special_Topic_box {
    width: 1200px;
    margin: 0 auto;
}

.h2 {
    position: relative;
    z-index: 3;
    text-align: center;
}

.h2 h2 {
    font-size: 40px;
}

.h2 p {
    color: #878787;
    line-height: 30px;
    margin-top: 10px;
}

.Mural_Special_list {
    margin-top: 30px;
}

.Mural_Special_list li {
    display: inline-block;
    width: 226px;
    margin: 15px;
    background-color: #fff;
    padding: 10px 20px;
    border-radius: 20px;
    transition: transform 0.3s;
    cursor: pointer;
}

/* 当鼠标悬停时，放大图片 */
.Mural_Special_list li:hover {
    transform: scale(1.1);
    /* 将图片放大1.1倍 */
}


.Mural_Special_list li img {
    width: 100%;
}

.Mural_Special_list li h3 {
    font-size: 26px;
    line-height: 40px;
    margin: 10px 0px;
}

.Mural_Special_list_txt {
    display: -webkit-box;
    -webkit-box-orient: vertical;
    -webkit-line-clamp: 3;
    overflow: hidden;
    font-size: 14px;
    color: #999;
    line-height: 26px;
}

.Mural_Special_list_number {
    font-size: 14px;
    color: #cdcdcd;
    margin-top: 10px;
}

.Mural_Special_list_number span {
    color: #bf4800;
}

/* <!-- 文献 --> */
#literature {
    width: 100%;
    background: url(../images/wenxian.png) no-repeat;
    background-position: center;
    background-size: cover;
    padding: 50px 0px;
}

#literature .h2 {
    color: #fff;
}

#literature_box {
    width: 1200px;
    margin: 0 auto;
    margin-top: 60px;
}

.literature_box_left {
    color: #fff;
    line-height: 30px;
    display: inline-block;
}

.literature_box_left ul {
    margin-top: 40px;
}

.literature_box_left ul li {
    margin-bottom: 30px;
    font-size: 20px;
    color: #B9B6B4;
    cursor: pointer;
}

.literature_box_left ul li:hover {
    color: #fff;
}

.literature_box_right {
    width: 590px;
    float: right;
    top: 0px;
}

.literature_box_right img {
    width: 100%;
}

/* <!-- 共创作品 --> */

#Co_create_works {
    width: 100%;
    padding: 50px 0px;
    background: url(../images/bg3.png) no-repeat;
    background-position: center;
    background-size: cover;
}

.Co_create_works_box {
    width: 1200px;
    margin: 0 auto;
}

.Co_create_works_box li {
    width: 296px;
    display: inline-block;
    margin: 30px 30px;
    background-color: #fff;
    border-radius: 20px;
    padding: 20px 20px;
}

.works_box_img {
    width: 100%;
    height: 296px;
    overflow: hidden;
    /* 隐藏超出容器的部分 */
    text-align: center;
    /* 图片水平居中 */
    position: relative;
}



.Co_create_works_box li:nth-child(1) .works_box_img {
    background: url(../images/create1.png) no-repeat;
    background-position: center;
    background-size: cover;
}

.Co_create_works_box li:nth-child(2) .works_box_img {
    background: url(../images/create2.png) no-repeat;
    background-position: center;
    background-size: cover;
}

.Co_create_works_box li:nth-child(3) .works_box_img {
    background: url(../images/create3.png) no-repeat;
    background-position: center;
    background-size: cover;
}

.Co_create_works_box h3 {
    font-size: 26px;
    line-height: 40px;
    margin: 10px 0px;
}

.Co_create_works_box li {
    transition: transform 0.3s;
    cursor: pointer;
}

/* 当鼠标悬停时，放大图片 */
.Co_create_works_box li:hover {
    transform: scale(1.1);
    /* 将图片放大1.1倍 */
}

.works_box_txt {
    height: 78px;
    display: -webkit-box;
    -webkit-box-orient: vertical;
    -webkit-line-clamp: 3;
    overflow: hidden;
    font-size: 14px;
    color: #999;
    line-height: 26px;
}

/* 底部版权信息 */
footer {
    position: relative;
    background-color: #000;
    padding: 60px 0px;
}

#footer {
    width: 1200px;
    margin: 0 auto;
    text-align: center;
    color: #878787;
    font-size: 14px;
}

.footer_left {
    position: absolute;
    left: 0px;
    bottom: 0px;
    width: 100px;
}

.footer_right {
    position: absolute;
    top: 0px;
    right: 0px;
    width: 100px;
}

/* <!-- 第二导航栏 --> */

#nav2 {
    width: 100%;
    line-height: 45px;
    background-color: #8C1B1B;
}

.nav2_box {
    width: 1200px;
    margin: 0 auto;
    color: #fff;
}

.nav2_box a {
    color: #fff;
    text-decoration: none;
}

/* 敦煌学文化 */
#banner2 {
    width: 100%;
    height: 140px;
    background-color: #000;
}

.banner2 {
    width: 1200px;
    height: 140px;
    background: url(../images/banner-two.png) no-repeat;
    background-size: cover;
    background-position: center;
    color: #fff;
}

.banner2 h3 {
    padding-left: 800px;
    line-height: 80px;
    color: #812918;
    font-size: 30px;
}

.banner2 p {
    padding-left: 840px;
    color: #B4B4B4;
    font-size: 20px;
}

#main_box {
    width: 1100px;
    margin: 0 auto;
    margin-top: 60px;
    margin-bottom: 60px;
}

#main_box h3 {
    font-size: 30px;
    border-bottom: 1px solid #EEEEEE;
    padding: 10px 0px;
    margin-bottom: 30px;
}

#main_box h3 span {
    color: #878787;
    font-size: 20px;
    margin-left: 10px;
}

.main_txt {
    padding: 20px;
}

.main_txt {
    padding: 20px;
}

.wenhua {
    float: left;
    width: 200px;
    margin-right: 20px;
    margin-bottom: 20px;
}

.main_txt p {
    text-indent: 2rem;
    line-height: 2em;
    color: #333;
    margin-bottom: 20px;
}

/* 壁画专题 */
#illustrate {
    position: relative;
    width: 100%;
    overflow: hidden;
}

#illustrate img {
    width: 100%;
}

.illustrate_box {
    position: absolute;
    width: 100%;
    text-align: center;
    color: #fff;
    top: 40px;
}

.illustrate_box p {
    width: 1000px;
    margin: 0 auto;
}

.illustrate_box h3 {
    font-size: 40px;
    line-height: 100px;
}

@keyframes zoom {
    0% {
        transform: scale(1);
    }

    50% {
        transform: scale(1.1);
    }

    /* 图片放大到1.1倍大小 */
    100% {
        transform: scale(1);
    }
}

#illustrate img {
    width: 100%;
    animation: zoom 5s infinite;
    /* 5秒的动画，无限循环 */
}

.main_box2 ul {
    width: 1200px;
    margin: 0 auto;
    text-align: center;
    margin-top: 60px;
    margin-bottom: 60px;
}

.main_box2 ul li {
    width: 266px;
    display: inline-block;
    margin: 0px 15px;
    margin-bottom: 30px;
}

.main_box2 ul li {
    transition: transform 0.3s;
    cursor: pointer;
}

/* 当鼠标悬停时，放大图片 */
.main_box2 ul li:hover {
    transform: scale(1.1);
    /* 将图片放大1.1倍 */
}


.main_box2 ul li p {
    text-align: left;
}

.main_box2 ul li p:nth-child(2) {
    font-size: 20px;
    margin: 10px 0px;
}

.main_box2 ul li p:nth-child(3) {
    font-size: 14px;
    color: #878787;
    margin-bottom: 10px;
}

.main_box2 ul li p:nth-child(4) {
    color: #FDCE4C;
}

.list_img {
    position: relative;
    width: 100%;
}

.list_img img {
    width: 100%;
    height: 180px;
}

.list_img span {
    position: absolute;
    top: 10px;
    left: 10px;
    background-color: #9c3925;
    color: #fff;
    padding: 5px 10px;
    font-size: 14px;
    letter-spacing: 4px;
}

/* 藏经洞文献 */
#Documents_box {
    width: 100%;
}

#Documents_box ul li {
    float: left;
    width: 48%;
    background-color: #F1ECE6;
    box-sizing: border-box;
    padding: 10px;
    border-radius: 10px;
    margin-top: 30px;
    overflow: hidden;
    height: 220px;
}

#Documents_box ul li:nth-child(2n) {
    margin-left: 4%;
}

.jing_img {
    float: left;
    height: 200px;
    text-align: center;
    width: 200px;
    background-color: #FFFFFF;
    border-radius: 10px;
    margin-right: 20px;
    overflow: hidden;
}

.jing_img img {
    height: 100%;
}

.jing_txt p:nth-child(1) {
    font-size: 20px;
    font-weight: bolder;
}

.jing_txt p:nth-child(2) {
    font-size: 12px;
    line-height: 30px;
}

.jing_txt p:nth-child(2) span {
    color: #9c3925;
}

.jing_txt p:nth-child(3) {
    color: #483C34;
    line-height: 26px;
    font-size: 14px;
}

/* 共创作品 */
#main_box2 {
    width: 100%;
    background-color: #F2EEE8;
}

#main_box2 h3 {
    font-size: 30px;
    padding: 10px 0px;
}

#main_box2 h3 span {
    color: #878787;
    font-size: 20px;
    margin-left: 10px;
}

.mian_box2 {
    width: 1200px;
    margin: 0 auto;
    padding-top: 60px;
    padding-bottom: 60px;
}

.Co_create_works_box li:nth-child(4) .works_box_img {
    background: url(../images/create4.png) no-repeat;
    background-position: center;
    background-size: cover;
}

.Co_create_works_box li:nth-child(5) .works_box_img {
    background: url(../images/create5.png) no-repeat;
    background-position: center;
    background-size: cover;
}

.Co_create_works_box li:nth-child(6) .works_box_img {
    background: url(../images/create6.png) no-repeat;
    background-position: center;
    background-size: cover;
}

/* 登陆页面 */
#form_box {
    position: relative;
    width: 100vw;
    height: 100vh;
    background: url(../images/bg5.jpg) no-repeat;
    background-size: cover;
    background-position: center;
    overflow: hidden;
}

.yunduo {
    height: 100%;
    animation: moveCloud 60s linear infinite;
}

@keyframes moveCloud {
    0% {
        transform: translateX(0);
    }

    50% {
        transform: translateX(calc(100vw - 100%));
    }

    100% {
        transform: translateX(0);
    }
}

.logo_a {
    position: absolute;
    top: 20px;
    left: 20px;
}

.logo_a img {
    width: 100px;
    border-radius: 20px;
    opacity: 0.8;
}

.form_list {
    position: absolute;
    width: 360px;
    padding: 30px;
    background-color: #000;
    z-index: 2;
    right: 4%;
    top: 50%;
    border-radius: 20px;
    margin-top: -200px;
}

.form_list ul li {
    margin-bottom: 20px;
}

.form_title {
    color: #BBBBBB;
    margin-bottom: 20px;
}

.form_title :hover {
    color: #fff;
}

.form_title span:hover>div {
    background-color: #FF1124;
}


.form_title span {
    float: left;
    width: 40px;
    text-align: center;
    margin-right: 20px;
    cursor: pointer;
}

.form_title span div {
    width: 100%;
    height: 4px;
    background-color: #000;
    border-radius: 2px;
    margin-top: 5px;
}

.title_style {
    color: #fff;
}

.title_style div {
    background-color: #FF1124 !important;
}

.list_in input {
    width: 100%;
    height: 60px;
    box-sizing: border-box;
    padding: 0px 10px;
    background-color: #323232;
    border: 0px;
    border-radius: 10px;
    color: #fff;
}

.list_in input::placeholder {
    color: 808080;
    font-weight: bolder;
}

input:focus {
    outline: none;
    /* 去掉默认的聚焦边框 */
    /* 或者您可以将边框样式设置为其他样式，如下所示 */
    /* border: 1px solid #999; */
}

.xieyi {
    color: #fff;
    font-size: 14px;
    line-height: 30px;
}

.xieyi input {
    position: relative;
    top: 2px;
    width: 14px;
    height: 14px;
    margin-right: 5px;
    border: 0px;
}

.caozuo button {
    width: 100%;
    height: 60px;
    border: 0px;
    background-color: #FF1124;
    color: #fff;
    font-weight: bolder;
    letter-spacing: 10px;
    border-radius: 10px;
}