body {
	background:#0b73bb;
}

nav.sec {
	background-color:#0b73bb;
}

footer {
	background:#0071c5;
}


/* here we add special directives for RIIS */
/* added by matto*/
.menu {
    background:#0b73bb url("../images/nav/bg.png") bottom repeat-x;
    position: relative;
    width: 100%;
    height: 50px;
    max-width: 1000px;
    margin: 0 auto;
}

.menu > li {
    float: left;
    box-sizing: border-box;
    width: 25%;
    height: 50px;
    text-align: center;
    display: flex;
    justify-content: center;
    align-items: center;
    list-style-type: none;
    border-left:solid 1px rgba(255,255,255,0.2);
    border-right:solid 1px rgba(255,255,255,0.2);
    transition:0.5s;
}

/* vitroid */
.menu > li ul {
    padding-left: 0;
}
.menu > li ul li {
    height: 50px;
    list-style-type: none;
    width: 250px;
    background-color: #045;
    padding: 0;
}

/* vitroid */
.menu > li a {
    display: block;
    color: #fff;
    width: 100%;
    height: 100%;
    display: flex;
    justify-content: center;
    align-items: center;
    padding-left: 10px;
    padding-right: 10px;
}

.menu > li a:hover {
    color: #999;
}

ul.menu__second-level {
    visibility: hidden;
    opacity: 0;
    z-index: 1;
    padding: 0;
}

ul.menu__third-level {
    visibility: hidden;
    opacity: 0;
}

ul.menu__fourth-level {
    visibility: hidden;
    opacity: 0;
}

.menu > li:hover {
    background:#ff8a00 url("../images/nav/bg.png") bottom repeat-x;
    -webkit-transition: all .5s;
    transition: all .5s;
}

.menu__second-level li {
    border-top: 1px solid #111;
}

.menu__third-level li {
    border-top: 1px solid #111;
}

.menu__second-level li a {
    padding: 0;
}

.menu__second-level li a:hover {
    background: #111;
    padding: 0;
}

.menu__third-level li a:hover {
    background: #2a1f1f;
}

.menu__fourth-level li a:hover {
    background: #1d0f0f;
}

/* arrow down */
.init-bottom:after {
    content: '';
    display: inline-block;
    width: 6px;
    height: 6px;
    margin: 0 0 0 15px;
    border-right: 1px solid #fff;
    border-bottom: 1px solid #fff;
    -webkit-transform: rotate(45deg);
    -ms-transform: rotate(45deg);
    transform: rotate(45deg);
}

/* clear the float*/
.menu:before,
.menu:after {
    content: " ";
    display: table;
}

.menu:after {
    clear: both;
}

.menu {
    *zoom: 1;
    padding-inline-start: 0;
}

.menu > li.menu__single {
    position: relative;
}

li.menu__single ul.menu__second-level {
    position: absolute;
    top: 40px;
    width: 100%;
    background: #072A24;
    -webkit-transition: all .2s ease;
    transition: all .2s ease;
    text-align: left;
}

li.menu__single:hover ul.menu__second-level {
    top: 50px;
    visibility: visible;
    opacity: 1;
    z-index:99;
    text-align: left;
}

/* vitroid https://www.will3in.co.jp/frontend-blog/article/expression-sitemap-tree-with-css-only/ */
#Main-content .tree ul {
    list-style: none;
    padding: 0 auto;
}
#main-content div.tree ul li:before {
    content: ' ';
    margin: 0;
}

#main-content .tree ul li ul {
    margin-top: .5em;
    margin-bottom: .75em;
    margin-left: 4px;
}

#main-content .tree ul li ul li {
    margin-bottom: .25em;
    position: relative;
    list-style-type: none;
}

#main-content .tree ul li ul li div.L2{
    padding: 12px;
    border: 1px solid #ccc;
}
#main-content .tree ul li .riis{
    font-size:120%;
    padding: 12px;
    background-color: #008;
    color: #fff;
}
#main-content .tree ul li ul li .core1{
    font-size:120%;
    padding: 12px;
    background-color: #c80;
    color: #fff;
}

#main-content .tree ul li ul li .core2{
    font-size:120%;
    padding: 12px;
    background-color: #080;
    color: #fff;
}

#main-content .tree ul li ul li .core3{
    font-size:120%;
    padding: 12px;
    background-color: #08c;
    color: #fff;
}

#main-content .tree ul li ul li::before {
    content: "";
    position: absolute;
    top: -0.5em;
    left: -16px;
    width: 10px;
    height: calc(100% + .75em);
    border-left: 1px solid #3972b2;
}

#main-content .tree ul li ul li:last-child::before {
    height: calc(1em + .25em);
}

#main-content .tree ul li ul li::after {
    content: "";
    position: absolute;
    top: .75em;
    left: -16px;
    width: 10px;
    border-bottom: 1px solid #3972b2;
}
#main-content .tree ul li ul li h3 {
	font-size:100%;
	font-weight:bold;
	color:#000;
	padding:0 0 5px 0;
	margin:0;
}
#main-content summary.L3 {
	font-size:100%;
	font-weight:bold;
	color:#000;
	padding:0 0 5px 0;
	margin:0;
}

#main-content table.tight {
	border-collapse:collapse;
	margin:0;
	width:100%;
	table-layout:fixed;
	word-wrap:break-word;
}


footer .nav ul.footer-menu li a.sns {
    width:40px;
    border-left: none;
}

/* banner of the institute */
header div h1 a img {
    max-width: 384px;
    width: 100%;
}