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

html, body {
	height: 100%;
	min-height: 100%;
	font-family: poppins;
	background: #000;
	overflow-x: hidden;
}

body {
	font-family: kanit, sans-serif;
	scroll-behavior: smooth;
}


/* add a thumb */
body::-webkit-scrollbar {
	width: 10px;
	height: 10px;
	background: rgba(0, 0, 0, 0.3);
	z-index: 99;
}

body::-webkit-scrollbar-thumb {
	background: rgba(250, 250, 250, 0.5);
	z-index: 100;
}


/* header */
.header {
	position: relative;
	height: 100vh;
	width: 100vw;
	margin: 0;
	padding: 0;
}

.header .back-video {
	position: absolute;
	right: 0; bottom: 0; left: 0; top: -2%;
	transform: translate(-50% -50%);
	max-width: 100vw;
	height: 100%;
	margin: 0;
	padding: 0;
	background-color: #000;
	z-index: 0;
}

.header .intro {
	position: absolute;
	top: 50%;
	left: 50%;
	transform: translate(-50%, -50%);
	text-align: center;
}

.header .intro h1 {
	font-size: 96px;
	text-transform: uppercase;
	font-weight: 300;
	color: #969696;
	font-family: 'Lucida Sans', 'Lucida Sans Regular', 'Lucida Grande', 'Lucida Sans Unicode', Geneva, Verdana, sans-seri
}

.intro-title .letter {
	display: inline-block;
	line-height: 1em;
}

nav .list {
	position: absolute;
	right: 0; bottom: 0;
	transform: translate(-50% -50%);
	display: flex;
	justify-content: space-between;
	width: 100%;
	height: 100%;
	margin: 0;
}

nav .list .nav-links {
	display: inline-block;
	margin: 0;
	padding: 1rem;
}

nav .list .left .nav-links li {
	flex-direction: column;
}

.nav-links li a::after {
	content: '';
	background: rgb(62, 212, 250);
	width: 0;
	height: 1px;
	position: absolute;
	bottom: 0; left: 0;
	transition: width 0.3s;
}

.nav-links li a:hover::after {
	width: 100%;
}

.list .left,
.list .right {
	display: flex;
	align-items: center;
}

.list .left .nav-links .chiyo,
.list .right .nav-links .naka {
	transition-delay: 7s;
}

.list .left .nav-links .chuo,
.list .right .nav-links .sugi {
	transition-delay: 7.2s;
}

.list .left .nav-links .mina,
.list .right .nav-links .toshi {
	transition-delay: 7.4s;
}

.list .left .nav-links .shin,
.list .right .nav-links .kita {
	transition-delay: 7.6s;
}

.list .left .nav-links .bun,
.list .right .nav-links .ara {
	transition-delay: 7.8s;
}

.list .left .nav-links .tai,
.list .right .nav-links .ita {
	transition-delay: 8s;
}

.list .left .nav-links .sumi,
.list .right .nav-links .neri {
	transition-delay: 8.2s;
}

.list .left .nav-links .koto,
.list .right .nav-links .ada {
	transition-delay: 8.4s;
}

.list .left .nav-links .shina,
.list .right .nav-links .katsu {
	transition-delay: 8.6s;
}

.list .left .nav-links .megu,
.list .right .nav-links .edo {
	transition-delay: 8.8s;
}

.list .left .nav-links .ota,
.list .right .nav-links .oth {
	transition-delay: 9s;
}

.list .left .nav-links .seta,
.list .right .nav-links .ba {
	transition-delay: 9.2s;
}

.list .left .nav-links .shibu {
	transition-delay: 9.4s;
}


.list ul {
	list-style: none;
}

.list ul li a{
	position: relative;
	font-size: 0.9rem;
	font-weight: 500;
	line-height: 1.1rem;
	color: rgb(215, 239, 250);
	text-decoration: none;
}

.list ul li a:hover {
	color: rgb(62, 212, 250);
}


/* media queries */
@media (min-aspect-ratio: 16/9) {
	.header .back-video {
		width: 100vw;
		height: auto;
	}
}

@media (max-aspect-ratio: 16/9) {
	.header .back-video {
		width: auto;
		height: 100%;
	}
}

@media (max-width: 1024px) {
	.header .intro h1 {
		font-size: 72px;
	}
}

@media (max-width: 912px) {
	.header .intro h1 {
		font-size: 48px;
	}

	.list .left {
		display: flex;
		align-items: center;
	}

	.list .nav-links li a{
		font-size: 1rem;
		line-height: 1.5rem;
	}
}


@media (max-width: 768px) {
	body::-webkit-scrollbar {
		display: none;
	}

	.list .nav-links li a {
		font-size: 1rem;
		line-height: 1.2rem;
	}
}


@media (max-width: 550px) {
	.header .intro h1 {
		font-size: 36px;
	}

	.list .nav-links li a {
		font-size: 0.5rem;
		font-weight: 100;
		line-height: 0;
	}
}


@media (max-width: 400px) {
	.header .intro h1 {
		font-size: 30px;
	}
}