@charset "UTF-8";
h1,.concept-top h2.txt-sub{
	font-size: 3.5em;
	letter-spacing:2px;
	font-weight: normal;
}
h2.concept-txtbig{
	font-size:3em;
	line-height: 1;
    margin-bottom: 0.2em;
	font-weight: lighter;
}
h3.concept-txtmin{
	font-size:2.5em;
	padding-top: 1em;
}
h2.concept-txtbig,h3.concept-txtmin{
	text-align: center;
}
h3.concept-txtmin::after{
	border-bottom:1px solid #999;
	width: 60%;
}
.concept-top{
	min-height: 730px;  
	position: relative;
	padding: 5em;
	background: url("../img/bg-concept.jpg") center / cover no-repeat;
}
.concept-top h2.txt-sub{
	color:#fff;
	text-align: center;
}
.concept-top h3.txt-subttl{
	text-align:right;
	font-size:.9em;
	color:#fff;
}
.concept01{
/*	background: url("../img/bg-storn.jpg") center / cover no-repeat;*/
	padding:5em 0;
	color: #222;
}
.concept-in{
	padding:2em 0;
	width: 65%;
	margin: 0 auto;
}
.concept-in p{
	line-height: 2;
	letter-spacing: 1px;
	font-size:1.4em;
	text-align:center;
}
.concept-underline{
	position:relative;
	margin-bottom: 3em;
}
.concept-underline::after {
  content: "";
  position: absolute;
  left: 0;
  right: 0;
  bottom: 0;
  border-bottom: 1px solid #333;
	width: 50%;
    margin: 0 auto;
}
.concept-underline::after {
  bottom: -20px;
}
.concept-child-in{
	width: 100%;
	padding-top: 1em;
    margin: 0 auto;
}
dateils,summary {
    list-style: none;
    cursor: pointer;
    margin: 0 auto 2em;
    font-weight: bold;
}
details summary::-webkit-details-marker {
	display: none;
}
details summary {
	cursor: pointer;
	width: 100%;
    text-align:justify;
}
details{
	border-bottom:1px solid #aaa;
	padding: 1.7em 0 1em 0;
	width: 50%;
	margin: 0 auto;
}
summary{
	outline: none;
	margin:0;
	color: #444;
	font-size: 1em;
    font-weight: lighter;
}
summary::before {
	display: inline-block;
	color: #444;
	content: "+";
	transform: rotate(0deg);
	transition: .2s transform ease;
	float: right;
}
details[open] summary::before {
	transform: rotate(90deg);
}
.details_content {
    background: #f5f5f5;
    padding: 16px;
    border-radius: 2px;
}
details[open] .details_content{
	animation: .8s details_content ease;
}
@media screen and (max-width:768px){
h1,.concept-top h2.txt-sub,h2.concept-txtbig{
		font-size:2.3em;
	}
h3.txt-subttl,.concept-top h3.txt-subttl{
		font-size:1.1em;
		text-align:center;
	}
	.concept01{
		padding: 2em 0;
	}
	.concept-in{
		width: 90%;
	}
	.concept-in p{
		font-size: 1.1em;
	}
	h3.concept-txtmin{
		font-size: 2.3em;
	}
	details{
		width:90%;
	}
}