:root {
	--bg: #1a1a1a;
	--line: #f5f5f5;
	--accent: #ff5c39;
	--footerbg: rgba(186,186,255,1);
}

* {
	margin: 0;
	padding: 0;
	box-sizing: border-box;
}

body {
	visibility: hidden;
}

body.is-loaded {
	visibility: visible;
}

html, body {
	overflow-x: hidden;
}

img {
	display: block;
}

@keyframes fadeIn {
	from { opacity: 0; }
	to { opacity: 1 }
}

@keyframes fadeInDown {
	from{
		opacity: 0;
		transform: translateY(-10px);
	}

	to {
		opacity: 1;
		transform: translateY(0px);
	}
}

html {
	overflow-x: hidden;
}

body {
	background-image: url(../img/seigaha.jpg);
	background-color: rgba(255,255,255,0.8);
	background-blend-mode: lighten;
	font-family: "Zen Old Mincho", serif;
	margin: 0;
	width: 100%;
	animation: fadeIn 0.8s ease-out;
	overflow-x: hidden;
}

header {
	color: white;
	font-size: 24px;
	height: 100px;
	align-content: center;
	background: linear-gradient(160deg, #3333D2, #5555D2);
	list-style: none;
	display: flex;
	position: fixed;
	width: 100%;
	justify-content: space-between;
	animation: fadeInDown 1.0s ease-out;
	z-index: 10;
}

img {
	display: block;
	min-height: 100%;
	/* 画像のドラッグや選択を無効化 */
	-webkit-user-select: none;
	-moz-user-select: none;
	-ms-user-select: none;
	user-select: none;

	/* クリックやタップの操作を無効化 */
	pointer-events: none;
}

#tabs_list_desktop {
	margin: auto 0;
	padding: 0;
	width: 100%;
	list-style: none;
	display: flex;
	gap: 88px;
	
}

#tabs_list_desktop li{
	display: flex;
	text-align: center;
}

#tabs_list_desktop a {
	text-decoration: none;
	color: inherit;
}

#icon_mobile {
	display: none;
	margin: auto;
}

#icon_mobile a {
	text-decoration: none;
	color: inherit;
}

.headerList {
	position: relative;
	display: inline-block;
}

.headerList::after {
	content: '';
	position: absolute;
	display: block;
	margin: 0 auto;
	bottom: -2px;
	width: 0;
	height: 2px;
	background: #dddddd;
	transition: width 0.6s ease;

}

.headerList:hover::after {
	width: 100%;
}

#contents {
	padding-top: 200px;
	width: 85%;
	margin: 0 auto;
}

.tag {
	font-size: 60px;
	text-shadow: 1px 1px 2px #444;
	border-bottom: 1px solid #000;
	padding: 0px 0px 0px 40px;
	margin: 0px 0px 60px 0px;
	width: 100%;
}

.expBox {
	width: 100%;
	margin-bottom: 300px; 
	border-radius: 10px;
	padding: 55px;
	background-color: rgba(245,245,245,1);
	background-blend-mode: lighten;
	box-shadow: 0 5px 20px rgba(100, 100, 100, 0.3);
	opacity: 0;
	transform: translateY(20px);
	transition: opacity 0.6s ease, transform 0.6s ease;
}

.expBox.visible {
	opacity: 1;
	transform: translateY(0);
}

.expBoxInside {
	padding: 110px;
	padding-top: 55px;
	padding-bottom: 85px
}

.expBoxTitle {
	color: #444477;
	font-size: 90px;
	border-bottom: 3px solid #777799;
	display: inline-block;
	margin: 0;
}

.expBoxSentence {
	color: #444444;
	font-size: 28px;
	overflow-wrap: anywhere;
}

.events {
	width: 70%;
}

.eventBox {
	border-radius: 20px;
	background-color: rgba(245,245,245,1); /*245, 245, 245, 1*/
	background-blend-mode: lighten;
	box-shadow: 0 5px 20px rgba(100, 100, 100, 0.3);
	padding: 50px;
	margin-bottom: 200px;
}

.eventTitle {
	display: inline-block;
	font-size: 45px;
	border-bottom: 2px solid #777799;
}

.eventContent {
	padding-top: 24px;
	font-size: 22px;
}

#floatingBox {
	border-radius: 20px;
	background-color: rgba(245,245,245,1); /*245, 245, 245, 1*/
	background-blend-mode: lighten;
	box-shadow: 0 5px 20px rgba(100, 100, 100, 0.3);
	width: 300px;
	position: fixed;
	top: 400px;
	left: 70%;
	transition: opacity 0.1s ease;
}

/* ハンバーガーボタン */
.hamburger {
	position: fixed;
	width: 40px;
	height: 32px;
	top: 36px;
	left: 30px;
	background: none;
	border: none;
	cursor: pointer;
	padding: 0;
	z-index: 3331;
}

.hamburger span {
	position: absolute;
	left: 0;
	width: 100%;
	height: 2px;
	background: #f5f5f5;
	border-radius: 2px;
	transition: transform 0.35s ease, opacity 0.25s ease, top 0.35s ease;
}

.hamburger span:nth-child(1) { top: 4px; }
.hamburger span:nth-child(2) { top: 15px; }
.hamburger span:nth-child(3) { top: 26px; }

/* 開いた状態 → ×に変形 */
.hamburger.active span:nth-child(1) {
	top: 15px;
	transform: rotate(45deg);
}
.hamburger.active span:nth-child(2) {
	opacity: 0;
}
.hamburger.active span:nth-child(3) {
	top: 15px;
	transform: rotate(-45deg);
}

/* オーバーレイメニュー */
.menu-overlay {
	position: fixed;
	inset: 0;
	background: #1a1a1a;
	display: flex;
	align-items: center;
	justify-content: center;
	opacity: 0;
	visibility: hidden;
	transition: opacity 0.4s ease, visibility 0.4s ease;
	z-index: 1000;
}

.menu-overlay.active {
	opacity: 1;
	visibility: visible;
}

.menu-list {
	list-style: none;
	margin: 0;
	padding: 0;
	text-align: center;
}

.menu-list li {
	margin: 18px 0;
	overflow: hidden;
}

.menu-list a {
	display: inline-block;
	color: #fff;
	text-decoration: none;
	font-size: clamp(1.6rem, 5vw, 2.6rem);
	font-weight: 600;
	letter-spacing: 0.02em;
	transform: translateY(110%);
	transition: transform 0.3s cubic-bezier(0.65, 0, 0.35, 1), color 0.2s ease;
}

.menu-overlay.active .menu-list a {
	transform: translateY(0);
}

.menu-list li:nth-child(1) a { transition-delay: 0.03s; }
.menu-list li:nth-child(2) a { transition-delay: 0.06s; }
.menu-list li:nth-child(3) a { transition-delay: 0.09s; }
.menu-list li:nth-child(4) a { transition-delay: 0.12s; }
.menu-list li:nth-child(5) a { transition-delay: 0.15s; }
.menu-list li:nth-child(6) a { transition-delay: 0.18s; }

.menu-list a:hover {
	color: #ff5c39;
}

footer {
	box-shadow: 0 5px 12px rgba(0, 0, 0, 0.5);
	height: 350px;
	align-content: center;
	background-color: var(--footerbg);
	background-blend-mode: lighten;
}

footer a {
	color: inherit;
	text-decoration: none;
}

.hamburger {
	display: none;
}

@media(980px <= width <= 1180px) {
	header {
		font-size: 22px;
	}

	header #tabs_list_desktop {
		gap: 60px;
	}

	#floatingBox {
		display: none;
	}

	.events {
		width: 100%;
	}
}

@media(width < 980px) {
	header {
		display: flex;
	}

	header #tabs_list_desktop {
		display: none;
	}

	#contents {
		width: 90%;
	}

	#floatingBox {
		display: none;
	}

	.expBoxSentence {
		font-size: 16px;
	}

	.expBox {
		padding: 25px;
	}

	.tag {
		padding: 0px;
		font-size: 30px;
	}

	.events {
		width: 100%;
	}

	.eventSentence {
		font-size: 18px;
	}

	.hamburger {
		display: block;
	}

	#icon_mobile {
		display: block;
	}
}