.mobile_hidden {
	display: block;
}

.mobile_visible {
	display: none;
}

@media screen and (max-aspect-ratio: 9/15) {

	.mobile_hidden {
		display: none;
	}

	.mobile_visible {
		display: block;
	}

	.center {
		width: 100vw;;
	}

	html {
		font-size: 2rem;
	}

	#top_bar {
		padding: 0.1rem;
		font-size: 0.3rem;
		display: none;
	}

	.top_bar_element {
		font-size: 0.3rem;
	}

	#top_main {
		height: auto;
		width: 100vw;
	}
	
	#top_main_site_logo {
		height: 4.5rem;
		margin: auto -0.5rem;
	}

	#top_main_site_title {
		margin: 0.5rem 0;
	}

	#top_main_site_title_short {
		font-size: 1.6rem;
	}

	#top_main_site_title_full {
		font-size: 0.7rem;
		letter-spacing: -0.03rem;
	}
	
	#top_main_site_subtitle {
		font-size: 0.7rem;
	}

	#top_main_organizer {
		height: 2.6rem;
		margin-right: 0.8rem;
	}

	#top_menu {
		height: auto;
		display: block;
	}

	#menu_top {
		padding: 0;
		font-size: 2.0rem;
		font-weight: bold;
		height: auto;
	}

	.top_menu_link {
		padding: 0.6rem;
		font-size: 1.5rem;
		letter-spacing: 0;
	}

	#content {
		display: block;
	}

	#content_info_main {
		width: 100vw;
		padding: 1rem 2rem;
	}

	.content_info_common_group {
		width: 80vw;
		margin: 0 auto;
		margin-top: 1rem;
		text-align: center;
	}

	.content_info_common_item {
		display: inline;
		margin-top: 0;
	}

	.content_info_common_item_element {
		/*display: inline;*/
		margin-top: 0;
	}

	#content_main {
		width: auto;
		padding: 0.01rem 1.4rem 0.01rem 1.2rem;
		padding-bottom: 3rem;
		text-align: justify;
	}

	#content_main .section_title {
		text-align: start;
	}

	#content_main p {
		font-size: 0.8em;
	}

	#content_main li {
		text-align: start;
		font-size: 0.8em;
	}

	.h1_level {
		margin-left: 0.25rem;
	}
	.h2_level {
		margin-left: 0.5rem;
	}
	.h3_level {
		margin-left: 1.0rem;
	}
	.h4_level {
		margin-left: 1.5rem;
	}

	#footer {
		font-size: 0.4rem !important;
	}
}