/*----- nav -----*/
.nav_area {
    background:rgb(0,68,155);
    /*box-shadow: 0 0 5px rgba(0, 0, 0, .3);*/
}

nav{
	position:relative;
	width:230px;
}
nav ul.main li a.emphasis{
	background-image: none;
	background-color: rgb(75,100,255);
	box-shadow: 0 0 4px rgba(0,0,0,.3);
	color: rgb(255,255,255);
}
nav ul.main li a.bg_blue{
	background-image: none;
	background-color: rgb(142,184,255);
	box-shadow: 0 0 4px rgba(0,0,0,.3);
}
nav ul.main li a.new::after{
	content:"NEW";
	font-size:1.4rem;
	font-weight:700;
	color:rgb(236, 59, 68);
	padding-left: 10px;
}
nav #sp_menu_button{
	display:none;
}
nav #sp_menu_button + label{
	box-sizing:border-box;
	position:fixed;
	top:18px;
	right:20px;
	display:none;
	padding:10px 8px;
	width:40px;
	background:rgb(17,49,94);
	color:rgb(255, 255, 255);
	transition:.2s ease-out;
	transition-property:border-color,box-shadow,transform;
	z-index:1600;
}
nav #sp_menu_button + label span{
	box-sizing:border-box;
	display:block;
	margin:0 auto;
	width:100%;
	height:3px;
	background:rgb(255,255,255);
	transition:.2s ease-out;
	transition-property:width,height,margin,box-shadow,transform;
	overflow:hidden;
}
nav #sp_menu_button + label span:nth-child(1),
nav #sp_menu_button + label span:nth-child(2){
	margin-bottom:5px;
}
	/*---- cheked ----*/
	nav #sp_menu_button:checked + label{
		/*transform:rotate(90deg);*/
		box-shadow:0 0 8px rgba(255,255,255,.45);
	}
	nav #sp_menu_button:checked + label span:nth-child(2){
		background:rgba(0,0,0,0);
		width:20px;
		height:20px;
		text-shadow:0 0 8px rgba(255,255,255,.6);
	}
	nav #sp_menu_button:checked + label span:nth-child(2)::before{
		content:"×";
		display:block;
		font-size:20px;
		line-height:20px;
		text-align:center;
	}
	nav #sp_menu_button:checked + label span:nth-child(1),
	nav #sp_menu_button:checked + label span:nth-child(2){
		margin-bottom:0;
	}
	nav #sp_menu_button:checked + label span:nth-child(1),
	nav #sp_menu_button:checked + label span:nth-child(3){
		height:0;
	}
nav ul.sub{
	box-sizing:border-box;
	margin:0;
	padding:10px;
	width:100%;
	background:rgb(178,141,79);
}
nav ul.sub li{
	display:flex;
	list-style:none;
	margin-bottom:6px;
}
nav ul.sub li:last-child{
	margin-bottom:0;
}
nav ul.sub li a{
	position:relative;
	box-sizing:border-box;
	display:flex;
	justify-content:space-around;
	align-items:center;
	align-content:center;
	padding:.7rem 0;
	width:100%;
	border:solid 1px rgb(255,255,255);
	font-size:1.5rem;
	color:rgb(255,255,255);
	text-decoration:none;
	transition:.2s ease-out;
	transition-property:background,color;
	text-align:center;
}
nav ul.sub li a:hover,
nav ul.sub li a.current{
	background:rgb(255,255,255);
	color:rgb(178,141,79);
}
nav ul.main{
	box-sizing:border-box;
	margin:0;
	padding:20px 10px;
	width:100%;
}
nav ul.main li{
	display:flex;
	list-style:none;
	/*margin-bottom:4px;*/
}
nav ul.main li a{
	position:relative;
	box-sizing:border-box;
	display:block;
	padding:.84em .2em .84em 1em;
	width:100%;
	font-size:1.4rem;
	background:url(../img/common_deco02.svg) left .4rem center no-repeat rgb(0,68,155);
	/*box-shadow:0 0 3px rgba(0,0,0,.3);*/
	color:rgb(255,255,255);
	line-height:1.4;
	text-decoration:none;
	transition:.2s ease-out;
	transition-property:background,border-bottom,color;
	overflow:hidden;
}
nav ul.main li a{
	border-bottom: solid 1px rgb(255,255,255);
}


/*新規ページを作成したら↓に新規ページのクラス名を追加
　例） .（クラス名）　nav ul.main li a.(クラス名)*/
.home nav ul.main li a.home,
.overview nav ul.main li a.overview,
.message nav ul.main li a.message,
.program nav ul.main li a.program,
.cf-abstract nav ul.main li a.cf-abstract,
.topic-abstract nav ul.main li a.topic-abstract,
.participants nav ul.main li a.participants,
.speakers nav ul.main li a.speakers,
.hands-on nav ul.main li a.hands-on,
.venue nav ul.main li a.venue,
.sponsors nav ul.main li a.sponsors,
.links nav ul.main li a.links,

nav ul.main li a:hover,
nav ul.main li a.current{
	background:url(../img/common_deco01.svg) left .2rem center no-repeat rgb(255,255,255);
	background-position:right .5rem center;
	color:rgb(0,68,155);
	text-shadow:0 0 2px rgba(0,0,0,.5);
}
nav ul.main li a:hover::before,
nav ul.main li a.current::before{
	left:.2rem;
}
nav ul li.banner{
	margin-top:20px;
}
nav ul li.banner + .banner{
	margin-top:5px;
}
nav ul li.banner a{
	padding:0;
	border-bottom:none;
	line-height:0;
	text-align:center;
	transition:opacity .2s ease-out;
}
nav ul li.banner a img{
	width:100%;
	vertical-align:bottom;
}
nav ul li.banner a img.sp{
	display:none;
	max-width:500px;
}
nav ul li.banner a:hover{
	background:none;
	border-bottom:none;
	opacity:.5;
}
nav ul p.abstract_note{
	font-size:1.2rem;
	line-height: 1.5rem;
	color:rgb(255,0,0);
	margin-top: 0.8rem;
}

nav ul li a.external::after{
	content:"";
	display:inline-block;
	background:url(../img/icon_external_black.svg) center center no-repeat;
	background-size:cover;
	width:.8em;
	height:.8em;
	margin-left:.5em;
	transition:background .2s ease-out;
}
	nav ul li a.external:hover::after{
		content:"";
		display:inline-block;
		background:url(../img/icon_external_white.svg) center center no-repeat;
		background-size:cover;
	}


/*-----------------------------------
-----------------------------------
	メディアクエリ
-----------------------------------
-----------------------------------*/
/*--960px--*/
@media screen and (max-width:960px){
/*--nav--*/
	nav{
		width:190px;
	}
	nav ul li a{
		padding:0.6em 1em;
	}
}

/*--800px--*/
@media screen and (max-width:800px){
/*--nav--*/
	nav.main{
		position:fixed;
		top:0;
		right:0;
		z-index:100;
	}
	nav .sp_nav{
		box-sizing:border-box;
		position:fixed;
		display:flex;
		flex-wrap:wrap;
		justify-content:space-between;
		right:-110%;
		padding:20px 10px;
		width:100%;
		background:rgba(0,0,0,.65);
		transition:right .3s ease-out;
		z-index:1500;
	}
	nav ul.sub{
		position:relative;
		display:flex;
		top:auto;
		right:auto;
		box-sizing:border-box;
		flex-wrap:wrap;
		justify-content:space-between;
		margin:0;
		padding:0;
		width:100%;
		background:none;
		box-shadow:none;
		text-align:center;
		z-index:100;
	}
	nav ul.sub li{
		box-sizing:border-box;
		border:none;
		list-style:none;
		margin:0 0 10px 0;
		width:49%;
	}
	nav ul.sub li:last-child{
		margin:0 0 10px 0;
	}
	nav ul.main{
		position:relative;
		display:flex;
		top:auto;
		right:auto;
		box-sizing:border-box;
		flex-wrap:wrap;
		justify-content:space-between;
		margin:0;
		padding:0;
		width:100%;
		box-shadow:none;
		text-align:center;
		z-index:100;
	}
	nav ul.main li{
		box-sizing:border-box;
		border:none;
		list-style:none;
		margin:0 0 10px 0;
		width:49%;
	}
	nav ul.main li a{
		display:flex;
		flex-wrap:wrap;
		justify-content:center;
		align-items:center;
		align-content:center;
		line-height:1.2;
	}
	nav #sp_menu_button + label{
		display:block;
	}
		/*---- cheked ----*/
		nav #sp_menu_button:checked + label + .sp_nav{
			right:0;
		}
		/*---- cheked ----*/
		nav #sp_menu_button:checked ~ .sp_nav .close_field{
			position:fixed;
			top:0;
			left:0;
			display:block;
			width:100vw;
			height:100vh;
			background:rgba(0,0,0,.3);
			z-index:50;
		}
}

/*--600px--*/
@media screen and (max-width:600px){
/*--nav--*/
	nav #sp_menu_button + label{
		top:5px;
		right:10px;
	}

nav ul p.abstract_note{
	display: none;
}

/*--400px--*/
@media screen and (max-width:400px){
/*--nav--*/
	nav #sp_menu_button + label{
		top:5px;
		right:10px;
	}
}