:root {
	--font-size-about-xl: 24px;
	--font-size-about-l: 20px;
	--font-size-about-m: 18px;
	--font-size-about-s: 16px;
}

/* ak-mdl */

.index #ak-main {
	display: flex;
	padding: 10px 10px 20px 10px;
	flex-direction: column;
	align-items: center;
	gap: 10px;
	align-self: stretch;

	background: url(../img/top-about-pc.jpg) lightgray 50% / cover no-repeat;
}

.index #ak-main .ak-top-about {
	display: flex;
	flex-direction: column;
	align-items: center;
	gap: 10px;
}

.index #ak-main .ak-section-about,
.index #ak-main .ak-section-archive {
	display: flex;
	flex-direction: column;
	align-items: center;
	gap: 10px;
	align-self: stretch;
	border-radius: 50px;
	border: 10px solid #85D8CE;
	background: var(--white-fff-t-mdl);

	backdrop-filter: blur(10px);
}

.index #ak-main .ak-section-about-top {
	position: relative;
	padding: var(--font-size-about-xl);
	width: 100%;
	display: flex;
	flex-direction: column;
	align-items: center;
}

/* 四隅の共通スタイル */
.ak-section-about-top::before,
.ak-section-about-top::after,
.ak-section-about-top div::before,
.ak-section-about-top div::after {
	content: "";
	position: absolute;
	width: var(--font-size-about-xl);
	height: var(--font-size-about-xl);
	background-image: url("../img/ak-corner.svg");
	background-size: contain;
	background-repeat: no-repeat;
}

/* 左上 */
.index #ak-main .ak-section-about-top::before {
	top: 0;
	left: 0;
	transform: rotate(-90deg);
}

/* 右上 */
.index #ak-main .ak-section-about-top::after {
	top: 0;
	right: 0;
	transform: rotate(0deg);
}

/* 左下 */
.index #ak-main .ak-section-about-top div::before {
	bottom: 0;
	left: 0;
	transform: rotate(180deg);
}

/* 右下 */
.index #ak-main .ak-section-about-top div::after {
	bottom: 0;
	right: 0;
	transform: rotate(90deg);
}

.index #ak-main h2,
.index #ak-main h3,
.index #ak-main h4,
.index #ak-main p {
	all: unset;
	display: block;
	width: 100%;
}

.index #ak-main h2,
.index #ak-main h3,
.index #ak-main h4 {
	text-align: center;
}

.index #ak-main .ak-button {
	margin: 20px auto;
}

.index #ak-main .ak-section-soft,
.index #ak-main .ak-section-theme,
.index #ak-main .ak-section-division,
.index #ak-main .ak-section-hard,
.index #ak-main .ak-section-theme-list-pc,
.index #ak-main .ak-section-theme-list-sp,
.index #ak-main .ak-section-year {
	display: flex;
	flex-wrap: wrap;
	justify-content: center;
	align-items: center;
	gap: 10px;
}

.index #ak-main .ak-section-hard {
	padding-top: 20px;
}

.index #ak-main .ak-section-theme img {
	width: 230px;
}

.index #ak-main .ak-section-division img {
	width: 180px;
}

.index #ak-main .ak-section-theme-list-pc img,
.index #ak-main .ak-section-theme-list-sp img {
	width: 720px;
}

.index #ak-main .ak-section-year img {
	width: 350px;
}

.index #ak-main .ak-section-theme img:hover,
.index #ak-main .ak-section-theme-list-pc img:hover,
.index #ak-main .ak-section-theme-list-sp img:hover,
.index #ak-main .ak-section-year img:hover {
	filter: brightness(1.2);
}

.index #ak-main p {
	color: #333;
	text-align: left;
	font-style: normal;
}

.index #ak-main strong {
	font-weight: 600;
	color: var(--main-clr);
}

/* =========================
  メディアクエリ SP
========================= */

@media screen and (max-width: 749px) {

	.index .ak-mdl {
		margin-top: var(--top-height-sp);
	}

	.index #ak-main .ak-section-about,
	.ak-section-archive {
		padding: 20px;
	}

	.index #ak-main .ak-section-about-top {
		padding: 20px;
	}

	/* 四隅の共通スタイル */
	.ak-section-about-top::before,
	.ak-section-about-top::after,
	.ak-section-about-top div::before,
	.ak-section-about-top div::after {
		width: var(--font-size-about-s);
		height: var(--font-size-about-s);
	}

	.index #ak-main img.about-h2-pc {
		display: none;
	}

	.index #ak-main img.about-h2-sp {
		width: 100%;
		max-height: 80px;
		margin-bottom: 10px;
	}

	.index #ak-main .ak-section-about img.about-h3,
	.index #ak-main .ak-section-archive img.about-h3 {
		max-height: var(--font-size-about-l);
		width: auto;
		margin-bottom: 0;
	}

	.index #ak-main h4 {
		font-size: var(--font-size-about-m);
		margin: 10px 0 0;
		font-weight: 600;
	}

	.index #ak-main .ak-section-about img.icon-soft,
	.index #ak-main .ak-section-about img.icon-hard {
		height: 50px;
		margin: 0 auto;
	}

	.index #ak-main p {
		font-size: var(--font-size-about-s);
		line-height: var(--line-height-l);
	}

	.index #ak-main .ak-section-theme-list-pc {
		display: none;
	}

	.index #ak-main .ak-section-theme-list-sp img {
		width: 500px;
	}

}

/* =========================
  メディアクエリ PAD
========================= */

@media screen and (min-width: 750px) and (max-width: 1124px) {

	.index #ak-main .ak-section-about,
	.index #ak-main .ak-section-archive {
		padding: 20px;
	}

	.index #ak-main .ak-section-about-top {
		padding: 20px;
	}

	/* 四隅の共通スタイル */
	.ak-section-about-top::before,
	.ak-section-about-top::after,
	.ak-section-about-top div::before,
	.ak-section-about-top div::after {
		width: var(--font-size-about-s);
		height: var(--font-size-about-s);
	}

	.index #ak-main img.about-h2-pc {
		display: none;
	}

	.index #ak-main img.about-h2-sp {
		width: 100%;
		max-height: 80px;
		margin-bottom: 10px;
	}

	.index #ak-main .ak-section-about img.about-h3,
	.index #ak-main .ak-section-archive img.about-h3 {
		max-height: var(--font-size-about-l);
		width: auto;
		margin-bottom: 0;
	}

	.index #ak-main h4 {
		font-size: var(--font-size-about-m);
		margin: 50px 0 0;
		font-weight: 600;
	}

	.index #ak-main .ak-section-about img.icon-soft,
	.index #ak-main .ak-section-about img.icon-hard {
		height: 50px;
		margin: 0 auto;
	}

	.index #ak-main p {
		font-size: var(--font-size-about-s);
		line-height: var(--line-height-l);
	}

	.index #ak-main .ak-section-theme-list-pc {
		display: none;
	}

	.index #ak-main .ak-section-theme-list-sp img {
		width: 500px;
	}

}

/* =========================
  メディアクエリ PC
========================= */

@media screen and (min-width: 1125px) {

	.index #ak-main .ak-section-about,
	.index #ak-main .ak-section-archive {
		padding: 20px;
	}

	.index #ak-main img.about-h2-pc {
		width: 100%;
		max-height: 50px;
		margin-bottom: 20px;
	}

	.index #ak-main img.about-h2-sp {
		display: none;
	}

	.index #ak-main .ak-section-about img.about-h3,
	.index #ak-main .ak-section-archive img.about-h3 {
		max-height: var(--font-size-about-xl);
		width: auto;
		margin-bottom: 0;
	}

	.index #ak-main h4 {
		font-size: var(--font-size-about-l);
		margin: 20px 0 0;
		font-weight: 600;
	}

	.index #ak-main .ak-section-about img.icon-soft,
	.index #ak-main .ak-section-about img.icon-hard {
		height: 50px;
		margin: 0 auto;
	}

	.index #ak-main p {
		font-size: var(--font-size-about-s);
		line-height: var(--line-height-l);
		max-width: 600px;
	}

	.index #ak-main .ak-section-theme-list-sp {
		display: none;
	}

}