@charset "UTF-8";
/*---- 全体 ------*/
* {
    -webkit-box-sizing: border-box;
    box-sizing: border-box;
}
*:hover{
    transition: .5s;
}
a{
    transition: .5s;
}
html{
    width: 100%;
    scroll-behavior: smooth;
}
body{
    color: #42515a;
    margin: 0;
    padding: 0;
    width: 100%;
    font-size: 1rem;
    font-weight: 400;
    line-height: 1.7;
    word-break : normal;
    word-wrap: break-word;
    overflow-wrap: break-word;
    font-family: 'Kosugi','Sawarabi Gothic', 'Noto Sans JP', Helvetica, 'Lucida Grande','ヒラギノ角ゴ Pro W3', 'Hiragino Kaku Gothic Pro', 'メイリオ', 'Meiryo', 'Meiryo UI', sans-serif;
    position: relative;
}
.wrap{
    padding: 0 32px;
    margin: 0 auto;
    width: 100%;
}
a[target="_blank"]::after {
    content: "\f35d";
    font-family: "Font Awesome 5 Free";
    font-weight: 900;
    margin-left: 5px;
    font-size: 70%;
}
a.pdf::after {
    content: "\f1c1";
    font-family: "Font Awesome 5 Free";
    font-weight: 900;
    margin-left: 5px;
    font-size: 80%;
}
/*---- header ------*/
.top header{
    background-image: url(../img/top-header.jpg);
    background-size: cover;
    background-position: center center;
    background-repeat: no-repeat;
    background-color: #075179;
    position: relative;
    z-index: 0;
    min-height: 500px;
    color: #fff;
}
.top header::before{
    content: '';
    display: block;
    position: absolute;
    top: 0;
    left: 0;
    background-color: #075179;
    background-image: linear-gradient(0deg, #067897 4%, #075179 100%);
    height: 100%;
    width: 100%;
    opacity: 0.8;
    z-index: -1;
}
.top header a{
    color: #fff;
    text-decoration: none;
}
.top header a:hover,
.top header a:focus,
.top header a:active{
    text-decoration: underline;
}

/*---- header 上部 ------*/
.header-box{
    display: flex;
    justify-content: space-between;
    align-items: flex-start;
    padding-top: 24px;
}

/*---- header サイト名 ------*/
.top header h1{
    font-size: 180%;
    line-height: 1;
    margin: 0;
}
.top header h1 a:hover{
    /*text-decoration: none;*/
}

/*---- header メニュー ------*/

.header-left{
    flex-shrink: 2;
}

.header-links{
    text-align: right;
}
.header-links a{
    font-size: 75%;
    font-weight: 100;
    display: inline-block;
}
.header-menu{
    display: flex;
    align-content: space-between;
    align-items: flex-end;
    width: 100%;
}

.header-menu nav{
    width: 50%;
}

nav ul{
    list-style-type: none;
    margin: 12px 0 0;
    padding: 0;
    display: flex;
    justify-content: flex-start;
    flex-wrap: wrap;
    width: 100%;
    font-weight: 100;

}
nav li{
    margin: 8px 16px 0 0;
    line-height: 1;
}
nav ul li:first-child{
    margin-left: 0;
}
@media only screen and (max-width: 800px){
    .header-menu{
        /*display: none;*/
    }
}

/*---- header サブリンクとロゴ ------*/
.header-right{
    display: flex;
    justify-content: right;
    align-items: flex-start;
}
.ja .lang-switch{
    width: 80px;
}
.en .lang-switch{
    width: 80px;
}




/*---- header 記事------*/
.header-content{
    margin: 60px auto 0 ;
    
}
.header-content h2{
    font-size: 150%;
    margin: 0 0 14px;
    text-align: center;
}
.header-content p{
    max-width: 800px;
    margin: 0 auto;
    padding: 0 0 16px;
}


/*---- article news ------*/

article h2{
    font-size: 150%;
    color: #067897;
    text-align: center;
    margin: 0;
}
article a{
    color: #31689a;
}

article a:hover,
article a:active,
article a:focus{
    text-decoration: none;
}

.article-news{
    margin: 80px auto 120px;
}
.article-news ul{
    list-style-type: none;
    margin: 56px auto 0;
    padding: 0 0 0 0;
    max-width: 560px;
}



.article-news li:first-child{
    border-top: 1px dashed #c5c5c5;
}
.article-news li{
    text-align: left;
    border-bottom: 1px dashed #c5c5c5;
    padding-bottom: 4px;
}

.article-news .date{
    display: block;
    margin-right: 24px;
    margin-top: 4px;
    font-size: 0.9rem;
}
.article-news .sub{
    font-size: 0.85rem;
}

@media only screen and (max-width: 600px){
    .article-news li{
        padding: 0 8px;
    }
    .article-news li span{
        display: block;
    }
    .article-news li .txt{
        
    }
}

/*---- article division ------*/
.division-box{
    display: flex;
    flex-wrap: nowrap;
    align-items: stretch;
    width: 100%;
}
.division{
    width: 50%;
    padding: 30px 16px;
    position: relative;
    min-height: 600px;
}
.division-left:hover{
    /*background:#fff;*/
    box-shadow: 2px 2px 10px 0 rgba(135,135,135, 0.4);
    transition: all 0.5s ease 0s;
    z-index: 10;
}
.division-right:hover{
    /*background:#fff;*/
    box-shadow: -2px 2px 10px 0 rgba(135,135,135, 0.4);
    transition: all 0.5s ease 0s;
}

.gray{
    background-color: #f2f3ec;
}
.division p{
    margin: 50px auto 160px;
    width: 95%;
    padding: 0 8px;
    max-width: 800px;
}
.section-box{
    margin: 0 auto;
    text-align: center;
    position: absolute;
    bottom: 60px;
    right: 0;
    width: 100%;
}
.section-box .section-p{
    margin: 0 auto;
    display: inline-block;
    text-align: left;
    width: auto;
    list-style-type: none;
    padding: 0;
}
.section-box .section-p a,
.section-box .section-p span{
    line-height: 2;
}

.section-box .section-p li::before{
    content: "\f054";
    font-family: "Font Awesome 5 Free";
    font-weight: 900;
    margin-right: 5px;
    font-size: 90%;
    text-decoration: none;
    color: #31689a;
}

@media only screen and (max-width: 1200px){
    .division-box{
        display: block;
    }
    .division {
        width: 100%;
    }
    .division p {
        padding: 0 8px;
    }
    .division:nth-child(odd) {
        background-color: #f2f3ec;
    }
    .division:nth-child(even) {
        background-color: #fff;
    }
    .section-box .section-p li{
        padding: 0 8px;
    }
}

/*---- article mission ------*/
.link-mission{
    display: block;
    text-align: center;
    margin: 40px 0 0;
    padding-bottom: 40px;
    text-decoration: underline !important;
}
.link-mission:hover{
    text-decoration: none !important;
}
.link-mission i{
    margin-right: 10px;
}
.article-mission{
    padding-top: 10px;
    margin: 80px auto 120px;
    width: 80%;
    max-width: 800px;
}
.article-mission h2{
    margin: 80px 0 40px;
}
.article-mission h3{
    text-align: center;
    margin: 60px 0 24px;
}

/*---- fadein ------*/
/* 画面外にいる状態 */
.fadein {
	opacity : 0.1;
	transform : translate(0, 50px);
	transition : all 500ms;
}

/* 画面内に入った状態 */
.fadein.scrollin {
	opacity : 1;
	transform : translate(0, 0);
}


/*---- footer ------*/
footer{
    background-color: #00304a;
    color: #fff;
}
footer a{
    text-decoration: none;
    color: #fff;
}
footer a:hover{
    text-decoration: underline;
}
.footer-top{
    padding: 100px 0 130px;
    display: flex;
    justify-content: center;
}
.footer-top-left{
    margin-right: 50px;
}
.footer-top-right{
    margin-left: 50px;
}
.footer-top-right p{
    font-size: 130%;
    margin: 0 0 24px;
    line-height: 1;
}
.organization-name{
    display: flex;
    justify-content: space-between;
}
.riken-logo{
    width: 55px;
    object-fit:contain;
    margin-right: 8px;
    background-color: #fff;
    padding: 4px;
}
.riken-logo-en{
    width: 60px;
    object-fit:contain;
    margin-right: 8px;
    background-color: #fff;
    padding: 8px;
}
.r-ih-logo{
    width: 360px;
    object-fit:contain;
    background-color: #fff;
    padding: 8px;
}
.r-ih-logo-en{
    width: 350px;
    object-fit:contain;
    background-color: #fff;
    padding: 8px;
}
.footer-top ul{
    list-style-type: none;
    margin: 0;
    padding: 0;
}
.footer-top a{
    display: inline-block;
    padding: 8px 0;
}

.footer-bottom{
    font-weight: 100;
    font-size: 75%;
    text-align: center;
}
@media only screen and (max-width: 800px){
    .footer-top{
        display: block;
    }
    .footer-top-left{
        margin-left: 24px;
        margin-right: 24px;
    }
    .organization-name{
        justify-content: flex-start;
        width: 440px;
    }
    .organization-name.eng{
        width: 480px;
    }
    .footer-top-right{
        margin-top: 56px;
        margin-left: 24px;
        margin-right: 24px;
    }
}
@media only screen and (max-width: 550px){
    .organization-name{
        width: 100%;
        flex-wrap: wrap;
    }
    .organization-name.eng{
        width: 100%;
        flex-wrap: wrap;
    }
    .riken-logo{
        width: 13%;
    }
    .r-ih-logo{
        width: 80%;
    }
    .riken-logo-en{
        width: 13%;
    }
    .r-ih-logo-en{
        width: 80%;
    }
}

/*---- スキップリンク ------*/
.skip-nav {
    margin: 0;
}

.skip-link {
    position: absolute;
    top: -26px;
    left: 0;
    display: inline-block;
    height: 1px;
    padding: 2px 10px;
    text-align: left;
    overflow: hidden;
    text-decoration: none;
    /*border-radius: 0 0 8px 8px;*/
    background: #FFF;
    color: #31689a !important;
    transition: top .3s ease;
}

.skip-link:focus {
    left: 0; 
    top: 0;
    width: auto; 
    height: auto; 
    overflow: visible; 
}