/* 声明 WebFont */
@font-face {
    font-family: 'futura';
    src: url('../font/futura.eot');
    src:
    /* 此行是为了获取IE嵌入权限 */
    url('../font/futura.eot?#iefix') format('embedded-opentype'),
    /* 此行是为了嵌入正常ttf字体文件，供大多数浏览器使用 */
    url('../font/futura.ttf') format('truetype');
}

/* reset，使各大浏览器显示效果一致 */
html,
body,
div,
span,
object,
iframe,
h1,
h2,
h3,
h4,
h5,
h6,
p,
blockquote,
pre,
a,
address,
code,
em,
img,
strong,
b,
u,
i,
dl,
dt,
dd,
ol,
ul,
li,
form,
label,
legend,
table,
caption,
tbody,
tfoot,
thead,
tr,
th,
td,
article,
aside,
canvas,
details,
embed,
figure,
figcaption,
footer,
header,
menu,
nav,
section,
time,
audio,
video {
    margin: 0;
    padding: 0;
    border: 0;
    font-size: 100%;
    font: inherit;
    vertical-align: baseline;
}
/* HTML5 display-role reset for older browsers */
article,
aside,
details,
figcaption,
figure,
footer,
header,
menu,
nav,
section {
    display: block;
}
body {
    line-height: 1;
}
ol,
ul,
li {
    list-style: none;
    line-height: normal;
}
blockquote,
q {
    quotes: none;
}
blockquote:before,
blockquote:after,
q:before,
q:after {
    content: '';
    content: none;
}
table {
    border-collapse: collapse;
    border-spacing: 0;
}
a {
    color: #a5a2a7;
    text-decoration: none;
}

a:hover {
    color: #ffc600;
}

.clearboth {
    clear: both;
}

html {
    height: 100%;
    -webkit-box-sizing: border-box;
    -moz-box-sizing: border-box;
    box-sizing: border-box;
}

*,
*:before,
*:after {
    -webkit-box-sizing: inherit;
    -moz-box-sizing: inherit;
    box-sizing: inherit;
}

body {
    min-height: 100%;
    position: relative;
    padding-bottom: 9rem;
}

html,
body,
section,
.container {
    width: 100%;
    margin: 0 auto;
    background-color: #f0f0f0;
    font-family: Helvetica, Arial, sans-serif;
}

.container {
    display: none;
}

#loading {
    width: 40px;
    height: 40px;
    background-color: #743481;

    margin: 100px auto;
    -webkit-animation: sk-rotateplane 1.2s infinite ease-in-out;
    animation: sk-rotateplane 1.2s infinite ease-in-out;
}

@-webkit-keyframes sk-rotateplane {
    0% { -webkit-transform: perspective(120px) }
    50% { -webkit-transform: perspective(120px) rotateY(180deg) }
    100% { -webkit-transform: perspective(120px) rotateY(180deg)  rotateX(180deg) }
}

@keyframes sk-rotateplane {
    0% {
        transform: perspective(120px) rotateX(0deg) rotateY(0deg);
        -webkit-transform: perspective(120px) rotateX(0deg) rotateY(0deg)
    } 50% {
        transform: perspective(120px) rotateX(-180.1deg) rotateY(0deg);
        -webkit-transform: perspective(120px) rotateX(-180.1deg) rotateY(0deg)
    } 100% {
        transform: perspective(120px) rotateX(-180deg) rotateY(-179.9deg);
        -webkit-transform: perspective(120px) rotateX(-180deg) rotateY(-179.9deg);
    }
}

h1,h2,h3,h4,h5{
    font-weight: bold;
    color: #743481;
}
h1{
    font-size: 2.6em;
    line-height: 2.45em;
}
h2{
    font-size: 2.1em;
    line-height: 1.9em;
}
h3{
    font-size: 1.8em;
    line-height: 1.65em;
}
h4{
    font-size: 1.65em;
    line-height: 1.4em;
}
h5{
    font-size: 1.4em;
    line-height: 1.25em;
}

p {
    color: #22132d;
}

button:hover {
    cursor: pointer;
}

.italic {
    font-style: italic;
}

.bold {
    font-weight: bold;
}

.page-header {
    border-bottom: 2px solid #743481;
}

.lab-title {
    padding-left: 10px;
    font-family: 'futura', Helvetica, Arial, sans-serif;
    font-weight: bold;
}

.index-link {
    color: #743481;
}

#hamburger {
    width: 30px;
    height: 30px;
    border: none;
    padding: 0;
    outline: none;
    background-color: rgba(0, 0, 0, 0);
    background-image: url('../img/hamburger.png');
    background-repeat: no-repeat;
    background-size: 30px 30px;
    z-index: 10;
    position: fixed;
    right: 1em;
    top: 35px;
}

.navigation {
    width: 100%;
    text-align: center;
    background-color: #743481;
    z-index: 10;
    position: fixed;
    opacity: 0.8;
    /* This trasform moves the drawer off canvas. */
    -webkit-transform: translate(-100%, 0);
    -ms-transform: translate(-100%, 0);
    transform: translate(-100%, 0);
    /* Optionally, we animate the drawer. */
    transition: transform 0.3s ease;
}

.open {
    -webkit-transform: translate(0, 0);
    transform: translate(0, 0);
}

.nav-li {
    font-size: 24px;
    color: #f0f0f0;
    padding: 15px 0;
    border-bottom: 1px solid #f0f0f0;
}

.nav-li:last-child {
    border-bottom: none;
}

.navlist-item {
    color: #f0f0f0;
}

.intro {
    margin: 30px auto;
    padding: 0 10px;
    text-align: justify;
    font-size: 16px;
    line-height: 25px;
    border-left: 5px solid #743481;
}

.page-footer {
    width: 100%;
    background-color: #22132d;
    margin: 20px auto 0 auto;
    padding: 20px 0;
    text-align: center;
    position: absolute;
    bottom: 0;
}

.address {
    color: #a5a2a7;
}

.footer-table {
    margin: 0 auto;
}

.footer-item {
    padding: 0 15px;
}

#footer-mid-item {
    border-left: 1px solid #a5a2a7;
    border-right: 1px solid #a5a2a7;
}

.lab-website {
    display: block;
    margin: 10px 0;
}

#go-top {
    visibility: hidden;
    width: 50px;
    height: 50px;
    border: none;
    padding: 0;
    outline: none;
    background-color: rgba(0, 0, 0, 0);
    background-image: url('../img/top.png');
    background-repeat: no-repeat;
    background-size: 50px 50px;
    z-index: 10;
    opacity: 0.5;
    position: fixed;
    right: 1em;
    bottom: 1em;
}

#go-top:hover {
    opacity: 1;
}

@media screen and (min-width: 720px) {
    #hamburger {
        display: none;
    }

    .navigation {
        -webkit-transform: translate(0, 0);
        transform: translate(0, 0);
        position: static;
        opacity: 1;
        display: flex;
        flex-wrap: wrap;
        align-content: center;
        justify-content: space-between;
    }

    .nav-li {
        border-bottom: none;
    }

    .navlist-item {
        padding: 0 8px;
    }
}

@media screen and (min-width: 1200px) {
    .page-header,
    .navigation,
    .main-content {
        width: 1200px;
        margin: 0 auto;
    }

    .navlist-item {
        padding: 0 30px;
    }
}

.beta {
    font-size: 14px;
    font-weight: normal;
    padding-left: 5px;
}

/* 为iphone和ipod设置，隐藏video的控制按钮 */
video::-webkit-media-controls-play-button,
video::-webkit-media-controls-start-playback-button {
    opacity: 0;
    pointer-events: none;
    width: 5px;
}

.nav-active {
    color: #ffc600;
}

/* index page */
.intro-main {
    margin: 0 auto;
    display: flex;
    flex-wrap: wrap;
    flex-direction: row;
    align-content: center;
    justify-content: space-around;
}

.intro-achievements {
    max-width: 288px;
    text-align: center;
    box-shadow: 0 0 50px #999;
    margin: 0 auto 20px auto;
}

.achievements-title {
    white-space: nowrap; /*禁止换行*/
    overflow: hidden; /*溢出截取*/
    text-overflow: ellipsis; /*省略超出部分*/
    font-size: 18px;
    font-weight: bold;
}

.achievement-link {
    color: #743481;
}

.main-images {
    width: 100%;
    padding-bottom: 10px;
}

.abstract {
    padding: 10px 15px;
    text-align: justify;
    line-height: 25px;
}

/* research page */
.main-body {
    text-align: center;
}

.achievements-title-list {
    margin-bottom: 30px;
}

.achievement-title-item {
    width: 100%;
    display: inline-block;
    padding: 15px;
    border-bottom: 1px solid #f0f0f0;
    font-size: 20px;
    font-weight: bold;
    color: #f0f0f0;
    background-color: #743481;
}

.achievement-title-item:hover {
    color: #ffc600;
    cursor: pointer;
}

.selected {
    color: #743481;
    background-color: rgba(116, 52, 129, 0.2);
    border-bottom: none;
    box-shadow: 0 5px 5px 0 #743481;
    transition: all 0.3s ease;
}

.achievement-details {
    box-shadow: 0 0 50px #999;
    transition: opacity 0.2s ease;
}

.full-title {
    padding: 15px 0;
}

.main-images {
    width: 100%;
    max-width: 388px;
    padding-bottom: 10px;
}

.description {
    text-align: left;
}

.portion {
    line-height: 1.5em;
    padding: 10px;
    text-align: justify;
}

.paper-link {
    color: #743481;
}

.indices-list {
    list-style: disc inside none;
    border-left: 5px solid #743481;
    padding-left: 10px;
}

.research-item-name {
    font-size: 1.2em;
    font-weight: bold;
}

.indices-item {
    list-style: inherit;
    line-height: 1.5em;
}

.item-title {
    text-align: left;
}

.inside-list {
    list-style: circle inside none;
    padding-left: 10px;
}

.inside-item {
    list-style: inherit;
    line-height: 1.5em;
}

@media screen and (min-width: 500px) {
    .achievements-title-list {
        margin-bottom: 0;
    }

    .achievement-title-item {
        width: 30%;
    }
}

/* research页面的子页面 */
.research-item-container {
  margin: 20px 10px;
}

.research-video {
  display: block;
  width: 100%;
  max-width: 540px;
  margin: 20px auto;
}

/* publication page */
/* 年份导航条 */
.timeline {
    width: 100%;
    background: -prefix-radial-gradient(#999 10%, #f0f0f0);
    background: radial-gradient(#999 10%, #f0f0f0);
}

/* 年份导航条在页面向下滚动时，固定在屏幕头部 */
.sticky {
    position: fixed;
    top: 0;
    left: 0;
    right: 0;
    margin: auto;
    box-shadow: 0 0 50px #999;
    z-index: 1;
}

/* 当导航条变为fixed时，用这个占位 */
.occupy {
    width: 1px;
    height: 56px;
    display: none;
}

.slick-nav {
    width: calc(100% - 50px);
    padding: 20px 0 1px 0;
    text-align: center;
    position: relative;
    opacity: 0.8;
}

.slick-nav:hover {
    opacity: 1;
}

.slick-list {
    border-bottom: 1px dashed #743481;
    height: 35px;
}

.slick-item {
    height: 18px;
}

.slick-link {
    position: relative;
    display: inline-block;
}

.slick-link::after {
    position: absolute;
    content: '';
    width: 5px;
    height: 5px;
    background-color: #ffc600;
    top: 29px;
    left: calc(50% - 5px);
}

.slick-prev:before, .slick-next:before {
    color: #743481;
}

.publication-main-content {
    position: relative;
}

/* 时间轴背景竖线 */
.publication-main-content::before {
    content: '';
    position: absolute;
    left: 18px;
    height: 100%;
    width: 4px;
    background-color: #743481;
    opacity: 0.3;
}

.year-collection {
    box-shadow: 0 0 50px #999;
    margin-bottom: 15px;
    padding: 10px;
    position: relative;
    padding-left: 40px;
}

.year-collection::before {
    position: absolute;
    content: '';
    top: 26px;
    left: 11px;
    width: 18px;
    height: 18px;
    background-color: #ffc600;
    border-radius: 50%;
}

.year {
    position: absolute;
    top: 18px;
    left: 50px;
    transition: all 0.5s ease;
}

.year:hover {
    -webkit-transform: scale(1.2);
    transform: scale(1.2);
    color: #ffc600;
    cursor: pointer;
}

/* 当点击年度导航条中的年份链接时，用此暗锚修复内容与导航条重叠的问题
segmentfault链接：https://segmentfault.com/q/1010000000124208 */
.target-fix {
    position: relative;
    top: -56px;
    display: block;
    height: 0;
    /*chrome doesn't recognize the anchor if overflow is hidden.*/
    /*overflow: hidden;*/
}

.current-year {
    -webkit-transform: scale(1.2);
    transform: scale(1.2);
    color: #ffc600;
    cursor: pointer;
}

.paper-list {
    margin-top: 55px;
    list-style: disc inside none;
    text-align: justify;
}

.paper {
    list-style: inherit;
    line-height: 1.5em;
    padding: 10px 0;
}

.paper-link {
    text-decoration: underline;
    color: #743481;
}

@media screen and (min-width: 1200px) {
    .timeline {
        width: 1200px;
        margin: 0 auto;
    }
}

/* 以下代码参考自https://codyhouse.co/gem/vertical-timeline/，
目的是加载publication每年的内容时，有个动画效果 */
.is-hidden {
    visibility: hidden;
}

.bounce-in {
    visibility: visible;
    -webkit-animation: cd-bounce-1 0.6s;
    -moz-animation: cd-bounce-1 0.6s;
    animation: cd-bounce-1 0.6s;
}

@-webkit-keyframes cd-bounce-1 {
    0% {
        opacity: 0;
        -webkit-transform: scale(0.8);
    }

    100% {
        -webkit-transform: scale(1);
    }
}
@-moz-keyframes cd-bounce-1 {
    0% {
        opacity: 0;
        -moz-transform: scale(0.8);
    }

    100% {
        -moz-transform: scale(1);
    }
}
@keyframes cd-bounce-1 {
    0% {
        opacity: 0;
        -webkit-transform: scale(0.8);
        -moz-transform: scale(0.8);
        -ms-transform: scale(0.8);
        -o-transform: scale(0.8);
        transform: scale(0.8);
    }

    100% {
        -webkit-transform: scale(1);
        -moz-transform: scale(1);
        -ms-transform: scale(1);
        -o-transform: scale(1);
        transform: scale(1);
    }
}

/* pepople page */
.entypo-globe:before {
    content: '\1F30E';
    color: #743481;
}

.entypo-users:before {
    content: '\1f465';
    color: #743481;
}

img {
    max-width: 100%;
}

.people-main-content {
    margin-top: 0;
}

.card {
    box-shadow: 0 0 50px #999;
    margin-bottom: 15px;
    text-align: center;
}

.boss {
    padding-top: 5px;
}

#boss-img {
    border-radius: 50%;
    width: 200px;
    margin: 10px 0;
}

.boss-name-chinese {
    font-family: 'Microsoft YaHei', '微软雅黑', 'Hiragino Sans GB', '冬青黑体',  sans-serif;
}

#boss-biography {
    display: block;
    margin: 10px auto;
    width: 120px;
    background-color: #743481;
    color: #f0f0f0;
    box-shadow: 0 0 50px #999;
    font-weight: bold;
    text-align: center;
    padding: 10px;
}

#boss-biography:hover {
    color: #ffc600;
}

.boss-contact {
    text-align: left;
    padding-left: 15px;
    padding-bottom: 15px;
}

.purple {
    color: #743481;
}

.boss-contact-head {
    padding: 15px;
    border-top: 1px solid #743481;
    text-align: left;
}

.boss-contact-item {
    padding: 3px 20px;
}

.boss-contact-link {
    color: #22132d;
    text-decoration: underline;
}

.degree {
    text-align: left;
    padding: 15px 10px;
}

.member-item {
    margin-bottom: 15px;
    padding: 15px 0;
}

.menber-img {
    border-radius: 50%;
    width: 150px;
}

.alumni {
    text-decoration: underline;
}

.alumni:hover {
    cursor: pointer;
    color: #ffc600;
}

/* pop up box */
#overlay{
    position: fixed;
    top: 0;
    left: 0;
    width: 100%;
    height: 100%;
    background-color: rgba(0, 0, 0, 0.8);
    z-index: 1001;
    transition: all 0.3s ease;
}

/* pop up box */
#alumni-box {
    position: fixed;
    top: calc(25% + 30px);
    left: 0;
    right: 0;
    width: 100%;
    height: 50%;
    background-color: #f0f0f0;
    z-index: 1002;
    overflow: auto;
    padding-top: 20px;
    margin: auto;
    -webkit-transition: opacity 0.3s ease;
    -moz-transition: opacity 0.3s ease;
    -ms-transition: opacity 0.3s ease;
    transition: opacity 0.3s ease;
}

#alumni-header {
    width: 100%;
    height: 30px;
    background-color: #743481;
    position: fixed;
    top: 25%;
    z-index: 1003;
    margin: auto;
    left: 0;
    right: 0;
    -webkit-transition: opacity 0.3s ease;
    -moz-transition: opacity 0.3s ease;
    -ms-transition: opacity 0.3s ease;
    transition: opacity 0.3s ease;
}

#close-alumni {
    font-size: 15px;
    position: absolute;
    right: 10px;
    top: 5px;
}

#alumni-body {
    text-align: left;
    padding: 10px;
    display: flex;
    flex-wrap: wrap;
    justify-content: center;
}

.alumni-school {
    text-align: center;
}

.alumni-degree {
    margin: 15px;
    width: 200px;
}

.alumni-member-list {
    height: 128px;
    overflow: auto;
}

.nooverflow {
    overflow: hidden;
    padding-right: 16px;
}

.beneath {
    opacity: 0;
    visibility: hidden;
}

/* responsive design */
@media screen and (min-width: 480px) {
    .boss,
    .member-list {
        display: flex;
        flex-wrap: wrap;
        justify-content: center;
        align-items: center;
    }

    #boss-img-area {
        width: 45%;
        text-align: center;
        padding: 0 10px;
    }

    .boss-info {
        width: 50%;
    }

    .boss-more {
        width: 50%;
    }

    .boss-contact-head {
        border-top: none;
    }

    .boss-contact {
        width: 100%;
    }

    .boss-contact-head {
        display: block;
        width: 100%;
    }

    .member-list {
        justify-content: space-around;
    }

    .member-item {
        margin: 10px;
        padding: 10px;
    }
}

@media screen and (min-width: 520px) {
    #alumni-box {
        width: 520px;
    }

    #alumni-header {
        width: 520px;
    }
}

@media screen and (min-width: 720px) {
    .boss-info {
        width: 60%;
    }

    .boss-more {
        width: 40%;
    }
}

@media screen and (min-width: 1080px) {
    .boss-contact {
        padding-left: 5%;
    }

    .member-list {
        justify-content: flex-start;
    }

    .member-item {
        padding: 15px;
    }
}

/* sctructure page */
#research-orientation {
    text-align: center;
}

.orientation-item {
    width: 100%;
    display: inline-block;
    padding: 15px;
    border-bottom: 1px solid #f0f0f0;
    font-size: 20px;
    font-weight: bold;
    color: #f0f0f0;
    background-color: #743481;
}

.orientation-item:hover {
    color: #ffc600;
    cursor: pointer;
}

.selected {
    color: #743481;
    background-color: rgba(116, 52, 129, 0.2);
    border-bottom: none;
    box-shadow: 0 5px 5px 0 #743481;
    transition: all 0.3s ease;
}

.current-orientation {
    transition: opacity 0.2s ease;
}

.category-item {
    box-shadow: 0 0 50px #999;
    margin-bottom: 15px;
}

.category-name {
    padding: 15px;
}

.sub-category-list {
    padding: 0 15px;
}

.vice-name {
    padding-left: 15px;
}

.item-info {
    display: flex;
    flex-wrap: wrap;
}

.item-content {
    width: 145px;
    text-align: center;
    display: inline-block;
    margin-bottom: 20px;
    vertical-align: top;
}

.item-name {
    line-height: 56px;
}

.item-name-inside {
    display: inline-block;
    vertical-align: middle;
    line-height: normal;
}

.item-thumbnail:hover {
    cursor: pointer;
}

/* 弹出对话框相关元素设置 */
#current-structure {
    margin-bottom: 50px;
}

#overlay{
    position: fixed;
    top: 0;
    left: 0;
    width: 100%;
    height: 100%;
    background-color: rgba(0, 0, 0, 0.8);
    z-index: 1001;
    transition: all 0.3s ease;
}

.beneath {
    opacity: 0;
    visibility: hidden;
}

#popup-header {
    width: 100%;
    height: 30px;
    background-color: #743481;
    margin-bottom: 10px;
}

#closeit {
    float: right;
    font-size: 15px;
    position: relative;
    right: 10px;
    top: 5px;
}

#closeit:hover {
    cursor: pointer;
}

#popup-structure {
    position: fixed;
    top: calc(15% + 10px);
    left: 0;
    right: 0;
    width: 100%;
    max-width: 600px;
    height: 70%;
    background-color: #f0f0f0;
    z-index: 1002;
    margin: auto;
    -webkit-transition: opacity 0.3s ease;
    -moz-transition: opacity 0.3s ease;
    -ms-transition: opacity 0.3s ease;
    transition: opacity 0.3s ease;
}

#popup-body {
    padding: 10px;
    height: calc(100% - 40px);
    overflow: auto;
    text-align: center;
}

.large-img {
    margin: 10px 0;
    max-width: 100%;
}

.describtion {
    text-align: left;
    padding: 5px 30px;
    line-height: 20px;
}

/* 禁止窗口弹出后，滚动页面 */
.nooverflow {
    overflow: hidden;
    padding-right: 16px;
}

@media screen and (max-width: 620px) {
    .item-info {
        justify-content: space-around;
    }
}

@media screen and (min-width: 720px) {
    #research-orientation {
        height: 76px;
    }

    .orientation-item {
        width: calc(24% - 4px);
        height: 100%;
        line-height: 15px;
        vertical-align: middle;
    }

    .orientation-item:after{
        display: inline-block;
        width: 0;
        height: 100%;
        vertical-align: middle;
        content: '';
    }
}

/* lab event page */
.lab-event-intro {
    text-align: center;
}

.scholl-logo {
    width: calc(50% - 5px);
    max-width: 200px;
}

#tsinghua-event-tags {
    text-align: center;
}

.event-title {
    width: 100%;
    display: inline-block;
    padding: 15px;
    border-bottom: 1px solid #f0f0f0;
    font-size: 20px;
    font-weight: bold;
    color: #f0f0f0;
    background-color: #743481;
}

.event-title:hover {
    color: #ffc600;
    cursor: pointer;
}

.selected {
    color: #743481;
    background-color: rgba(116, 52, 129, 0.2);
    border-bottom: none;
    box-shadow: 0 5px 5px 0 #743481;
    transition: all 0.3s ease;
}

.current-event-item {
    padding: 10px;
    margin-bottom: 15px;
    box-shadow: 0 0 50px #999;
}

.name {
    padding: 10px 0;
}

.awards {
    list-style: disc inside none;
}

.award {
    list-style: inherit;
    line-height: 1.5em;
    text-align: justify;
}

.happy-pics {
    display: block;
    max-width: 100%;
    margin: 20px auto;
    box-shadow: 0 0 50px #999;
}

@media screen and (min-width: 610px) {
    .event-title {
        width: 30%;
    }
}

@media screen and (min-width: 720px) {
    .happy-pics {
        display: inline-block;
        width: calc(50% - 42.5px);
        margin: 20px;
    }
}

/* 404 page */
.error-main-content {
    text-align: center;
    padding-top: 30px;
}

.error-img {
    width: 100%;
    max-width: 400px;
}

@media screen and (min-width: 720px) {
    .error-main-content {
        padding-top: 180px;
    }
}