@charset "utf-8";

.introduction {
	letter-spacing: 0.05em;
	background-color: #000;
	color: #fff;
}

.introduction_inner {
	width: 100%;
	max-width: 1100px;
	margin: 0 auto;
	padding-top: 100px;
	padding-bottom: 100px;
}

.introduction_unit.bg_cosmic {
	background: url(../img/research-introduction/bg2.jpg)no-repeat 50% / cover;
}

.ntroduction_unit_ttl {
	font-size: 28px;
	margin-bottom: 30px;
}

.movie_ctn {
	display: -webkit-box;
	display: -ms-flexbox;
	display: flex;
	-ms-flex-wrap: wrap;
	flex-wrap: wrap;
}

.movie_list {
	position: relative;
	display: block;
	width: 30%;
	margin-right: 5%;
	margin-bottom: 50px;
	background-color: #EEF0EF;
}

.movie_list:nth-child(3n) {
	margin-right: 0;
}

.movie_list_thubm {
	position: relative;
	width: 100%;
	padding-bottom: 56.25%;
	height: 0;
	background-color: #555;
	background-size: cover;
	background-position: center;
}

.movie_list_thubm .comming{
	position: absolute;
    top: 50%;
    left: 50%;
    transform: translate(-50%, -50%);
    -webkit-transform: translate(-50%, -50%);
    -ms-transform: translate(-50%, -50%);
	font-size: 20px;
}

.movie_list_desc {
	text-align: center;
	padding: 20px 5px 60px;
}

.desc_ttl {
	font-size: 16px;
	font-weight: bold;
	color: #00356A;
}

.desc_teacher {
	display: block;
	margin-bottom: 10px;
	font-weight: normal;
}

.desc_btn {
	position: absolute;
	bottom: 20px;
	left: 0;
	right: 0;
	display: block;
	width: 70%;
	height: 40px;
	line-height: 40px;
	margin: 0 auto;
	background-color: #000;
	border: 1px solid #000;
	color: #fff;
	font-size: 14px;
	-webkit-transition: all 0.5s;
	transition: all 0.5s;
}

.desc_btn:hover {
	background-color: transparent;
	color: #000;
}

.desc_btn::after {
	content: '';
	width: 6px;
	height: 6px;
	border: 0;
	border-top: solid 2px #fff;
	border-right: solid 2px #fff;
	position: absolute;
	top: 50%;
	right: 10%;
	margin-top: -5px;
	-webkit-transform: rotate(45deg);
	-ms-transform: rotate(45deg);
	transform: rotate(45deg);
	-webkit-transition: all 0.5s;
	transition: all 0.5s;
}

.desc_btn:hover::after {
	border-top: solid 2px #000;
	border-right: solid 2px #000;
}
/* modal */
.c-modal {
    display: none;
    height: 100vh;
    position: fixed;
    top: 0;
    width: 100%;
    top: 0;
    left: 0;
    z-index: 10;
}

.c-modal_bg {
    background: rgba(0, 0, 0, 0.7);
    height: 100vh;
    width: 100%;
}

.c-modal_content {
    background: #fff;
    left: 50%;
    position: absolute;
    top: 50%;
    transform: translate(-50%, -50%);
    width: 50%;
    height: auto;
}

.c-modal_content_inner {
    position: relative;
    width: 100%;
    padding-bottom: 56.25%;
    height: 0px;
}
.c-modal_content_inner iframe{
    position: absolute;
    top: 0;
    left: 0;
    width: 100%;
    height: 100%;
}

.c-modal_close {
    position: absolute;
    top: -30px;
    right: 10px;
    color: #fff;
}
/* All SP & Tablet */
@media screen and (max-width: 1200px) {
	.introduction_inner {
		width: auto;
		margin: 0 3%;
	}
	
}

/* All SP */
@media screen and (max-width: 639px) {
	.introduction_inner{
		padding-top: 60px;
		padding-bottom: 30px;
	}
	.ntroduction_unit_ttl {
		font-size: 20px;
		margin-bottom: 20px;
		text-align: center;
	}
	.movie_ctn {
		display: block;
	}
	
	.movie_list {
		width: 90%;
		margin:0 auto 40px
	}
	.movie_list:nth-child(3n) {
		margin-right: auto;
	}
	.desc_ttl {
		font-size: 15px;
	}
	.movie_list_thubm .comming{
		font-size: 15px;
	}
	.c-modal_content {
		width: 90%;
	}
}

/* Portrait */
@media screen and (max-width:479px) {}