/* ==========================================================
   老い科学研究所 ハブページ（page-oikagaku.php）専用スタイル
   スコープ：#oikagaku 配下のみ。他ページへの影響なし。
   ========================================================== */

#oikagaku {
	--oik-navy: #2c3e50;
	--oik-navy-soft: #52667a;
	--oik-gold: #a68b5b;
	--oik-cream: #f7f5f0;
	--oik-border: #e2e2e2;
	color: #202020;
}

#oikagaku .inner {
	width: 92%;
	max-width: 88rem;
	margin: 0 auto;
}

#oikagaku section {
	padding: 6rem 0;
}

#oikagaku section:nth-of-type(even) {
	background: var(--oik-cream);
}

#oikagaku h2 {
	position: relative;
	margin-bottom: 3rem;
	padding: 0;
	text-align: center;
	font-size: 2.6rem;
	font-weight: 600;
	color: var(--oik-navy);
	background: none;
	letter-spacing: 0.1rem;
}

#oikagaku h2:after {
	content: "";
	display: block;
	margin: 1.5rem auto 0;
	width: 6rem;
	height: 0.2rem;
	background: var(--oik-gold);
}

#oikagaku .desc {
	max-width: 76rem;
	margin: 0 auto 3rem;
	text-align: center;
	line-height: 1.9;
}

#oikagaku .flex {
	display: flex;
}

/* ---------- ヒーロー画像 .mainv ---------- */
#oikagaku .mainv {
	height: 20rem;
	overflow: hidden;
}

#oikagaku .mainv img {
	width: 100%;
	height: 100%;
	object-fit: cover;
	object-position: center bottom;
}

/* ---------- ファーストビュー #lead ---------- */
#oikagaku #lead {
	background: #fff;
	padding-top: 5rem;
}

#oikagaku #lead .lead {
	text-align: center;
	margin-bottom: 3rem;
}

#oikagaku #lead h1 .label {
	display: inline-block;
	margin-bottom: 1.2rem;
	font-size: 1.4rem;
	font-weight: 600;
	letter-spacing: 0.1em;
	color: var(--oik-gold);
}

#oikagaku #lead h1 {
	font-size: 3rem;
	font-weight: 700;
	color: var(--oik-navy);
}

#oikagaku #lead .intro {
	max-width: 70rem;
	margin: 0 auto;
	text-align: center;
	line-height: 2;
}

/* ---------- 発信のスタンス #stance ---------- */
#oikagaku .stance-grid {
	flex-wrap: wrap;
	justify-content: center;
	gap: 2rem;
	margin-bottom: 3rem;
}

#oikagaku .stance-item {
	width: calc((100% - 4rem) / 3);
	min-width: 22rem;
	padding: 2.6rem 2rem;
	border-radius: 0.6rem;
	background: #fff;
	text-align: center;
	box-shadow: 0 0.2rem 1rem rgba(0, 0, 0, 0.06);
}

#oikagaku .stance-item h3 {
	margin-bottom: 1.2rem;
	font-size: 1.6rem;
	font-weight: 600;
	color: var(--oik-navy);
}

#oikagaku .stance-item p {
	line-height: 1.8;
	font-size: 1.4rem;
}

/* ---------- 記事一覧 #articles ---------- */
#oikagaku .article-grid {
	flex-wrap: wrap;
	justify-content: center;
	gap: 2.4rem;
}

#oikagaku .article-card {
	display: block;
	width: 100%;
	max-width: 46rem;
	border-radius: 0.6rem;
	overflow: hidden;
	background: #fff;
	box-shadow: 0 0.2rem 1rem rgba(0, 0, 0, 0.08);
	transition: opacity 0.3s;
}

#oikagaku .article-card:hover {
	opacity: 0.85;
}

#oikagaku .article-card .img img {
	width: 100%;
	height: 20rem;
	object-fit: cover;
}

#oikagaku .article-card .txts {
	padding: 2.4rem 2.2rem;
}

#oikagaku .article-card .cat {
	margin-bottom: 0.8rem;
	font-size: 1.3rem;
	font-weight: 600;
	letter-spacing: 0.05em;
	color: var(--oik-gold);
}

#oikagaku .article-card h3 {
	margin-bottom: 1.2rem;
	font-size: 1.9rem;
	font-weight: 600;
	line-height: 1.5;
	color: var(--oik-navy);
}

#oikagaku .article-card p {
	margin-bottom: 1.6rem;
	line-height: 1.8;
	font-size: 1.4rem;
	color: #444;
}

#oikagaku .article-card .more {
	position: relative;
	display: inline-block;
	padding-right: 2rem;
	font-size: 1.4rem;
	font-weight: 600;
	color: var(--oik-navy);
}

#oikagaku .article-card .more:after {
	content: "";
	position: absolute;
	top: 50%;
	right: 0.2rem;
	width: 0.7rem;
	height: 0.7rem;
	border-top: 0.2rem solid var(--oik-navy);
	border-right: 0.2rem solid var(--oik-navy);
	transform: translateY(-65%) rotate(45deg);
}

/* ---------- 施設への導線 #related ---------- */
#oikagaku #related {
	background: #fff;
}

#oikagaku #related .card {
	align-items: center;
	justify-content: center;
	max-width: 80rem;
	margin: 0 auto;
	padding: 3.6rem;
	border-radius: 0.6rem;
	background: var(--oik-cream);
	text-align: center;
}

#oikagaku #related h2 {
	margin-bottom: 1.6rem;
}

#oikagaku #related p {
	margin-bottom: 2rem;
	line-height: 1.9;
}

#oikagaku .btn.arrow {
	display: inline-block;
}

#oikagaku .btn.arrow a {
	position: relative;
	display: inline-block;
	padding: 1.2rem 3.2rem 1.2rem 2rem;
	border: 0.1rem solid var(--oik-navy);
	border-radius: 0.4rem;
	background: var(--oik-navy);
	color: #fff;
	font-size: 1.5rem;
	font-weight: 600;
}

#oikagaku .btn.arrow a:after {
	content: "";
	position: absolute;
	top: 50%;
	right: 1.4rem;
	width: 0.7rem;
	height: 0.7rem;
	border-top: 0.2rem solid #fff;
	border-right: 0.2rem solid #fff;
	transform: translateY(-50%) rotate(45deg);
}

/* ---------- レスポンシブ ---------- */
@media (max-width: 750px) {
	#oikagaku section {
		padding: 4.5rem 0;
	}

	#oikagaku h2 {
		font-size: 2.1rem;
	}

	#oikagaku #lead h1 {
		font-size: 2.4rem;
	}

	#oikagaku .desc {
		text-align: left;
	}

	#oikagaku .stance-item {
		width: 100%;
	}

	#oikagaku #related .card {
		padding: 2.4rem;
	}
}