.main_visual {
	background-image: url(https://www.bigbang-web.jp/wp-content/themes/bigbang/assets/img/session/main.png),
		url(../img/common/main_bg.jpg);
}

@media screen and (max-width: 767px) {
	.main_visual {
		background-image: url(https://www.bigbang-web.jp/wp-content/themes/bigbang/assets/img/session/main_sp.png),
			url(../img/common/main_bg.jpg);
	}
}

.margin_box {
	margin-bottom: 20px;
}
.session {
	margin-bottom: 40px;
}
.session li {
	display: flex;
	margin-bottom: 10px;
}
.session li > span {
	margin-right: 5px;
}
.session_date {
	margin-bottom: 20px;
}
.session_date dt {
	background-color: #7ec211;
	color: #ffffff;
	padding: 10px;
}
/* .session_date dd {
	padding: 0 10px;
} */
.session_date dd ul {
	display: flex;
	flex-wrap: wrap;
	padding-top: 10px;
}
.session_date dd ul li {
	width: 190px;
	font-size: 1.8rem;
	margin-bottom: 10px;
}
.session_date dd ul li span {
	margin-right: 5px;
	color: #7ec211;
}
@media screen and (max-width: 789px) {
	.session_date dd ul li {
		width: 50%;
		font-size: 1.6rem;
		margin-bottom: 10px;
	}
}

table.lecture_table {
	border-collapse: collapse;
	width: 100%;
	margin-bottom: 10px;
}
table.lecture_table thead th {
	background-color: #eceef2;
}
table.lecture_table thead th,
table.lecture_table th,
table.lecture_table td {
	border: 1px solid #bfc7d3;
	text-align: center;
	padding: 4px;
	font-size: 1.5rem;
}
table.lecture_table th.ta_title {
	background-color: #eaf8f8;
}
table.lecture_table thead th:not(:last-of-type) {
	width: 150px;
}
table.lecture_table .btn_area {
	display: flex;
	align-items: center;
	justify-content: space-around;
	flex-wrap: wrap;
	margin-top: 0;
}
table.lecture_table .btn {
	display: inline-flex;
	width: 48%;
	font-size: 1.4rem;
	border-radius: 10px;
}
table.lecture_table .btn:nth-of-type(-n + 2) {
	margin-bottom: 5px;
}
@media screen and (max-width: 789px) {
	table.lecture_table {
		border: 1px solid #bfc7d3;
	}
	table.lecture_table thead th,
	table.lecture_table th,
	table.lecture_table td {
		font-size: 1.2rem;
	}
	table.lecture_table thead th:not(:last-of-type) {
		width: 20%;
		min-width: 80px;
	}
	table.lecture_table thead th:first-of-type {
		/* width: 80px; */
	}
	table.lecture_table .btn_area {
		flex-wrap: wrap;
	}
	table.lecture_table .btn {
		width: 48%;
	}
	table.lecture_table .btn:nth-of-type(-n + 2) {
		margin-bottom: 5px;
	}
}
@media screen and (max-width: 500px) {
	table.lecture_table .btn {
		width: 100%;
	}
	table.lecture_table .btn:nth-of-type(2) {
		order: 1;
	}
	table.lecture_table .btn:nth-of-type(4) {
		order: 2;
	}
	table.lecture_table .btn:not(:last-of-type) {
		margin-bottom: 5px;
	}
}

.btn_area.flex_area {
	display: flex;
	justify-content: center;
}
.btn_area.flex_area .btn {
	width: 230px;
}