:root {
	--ink: var(--text-ink);
	--water: 120, 212, 207;
	--drop-ink: 63, 110, 140;
	--paper: var(--foam-white);
	--impact-x: 50vw;
	--impact-y: 51.5svh;
	--drop-start: calc(-1 * (var(--impact-y) + 76px));
	--ripple-size: 136vmax;
	--diagram-stroke: 2px;

	/* Values below are populated from assets/js/intro.js. */
	--drop-delay: 240ms;
	--drop-duration: 1140ms;
	--ripple-delay: 1380ms;
	--ripple-duration: 1900ms;
	--reveal-delay: 2380ms;
	--reveal-duration: 650ms;
	--intro-end: 3030ms;
}

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

html {
	background: var(--paper);
	-webkit-text-size-adjust: 100%;
}

body {
	min-width: 320px;
	min-height: 100svh;
	margin: 0;
	overflow: hidden;
	background: var(--paper);
	color: var(--ink);
	font-family: -apple-system, BlinkMacSystemFont, "Hiragino Sans", "Yu Gothic", "YuGothic", "Noto Sans JP", sans-serif;
	font-synthesis: none;
	-webkit-font-smoothing: antialiased;
}

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

.site-view {
	position: relative;
	min-height: 100svh;
	background: var(--paper);
}

.site-header {
	position: absolute;
	z-index: 1;
	top: clamp(26px, 4.1vw, 58px);
	right: clamp(26px, 5.5vw, 84px);
	left: clamp(26px, 5.5vw, 84px);
	display: flex;
	justify-content: flex-end;
}

.site-nav {
	display: flex;
	align-items: center;
	gap: clamp(22px, 2.8vw, 46px);
	font-size: 10px;
	font-weight: 500;
	letter-spacing: 0.17em;
	line-height: 1;
}

.site-nav a {
	position: relative;
	padding: 6px 0;
	opacity: 0.72;
	transition: opacity 220ms ease;
}

.site-nav a:hover,
.site-nav a:focus-visible {
	opacity: 1;
}

.site-nav a:focus-visible {
	outline: 1px solid rgba(var(--water), 0.5);
	outline-offset: 7px;
}

.site-main {
	display: grid;
	min-height: 100svh;
	place-items: center;
	padding: 8vh 28px 0;
}

.site-name {
	margin: 0;
	color: var(--ink);
	font-size: clamp(23px, 2.25vw, 34px);
	font-weight: 400;
	letter-spacing: 0.16em;
	line-height: 1.5;
	text-indent: 0.16em;
}

.intro {
	display: none;
	position: fixed;
	z-index: 1000;
	inset: 0;
	overflow: hidden;
	pointer-events: none;
}

.has-intro .intro {
	display: block;
}

.intro::before {
	position: absolute;
	inset: 0;
	background: var(--paper);
	content: "";
}

.intro-surface {
	position: absolute;
	top: var(--impact-y);
	left: var(--impact-x);
	width: 0;
	height: 0;
}

.intro-drop {
	position: absolute;
	z-index: 2;
	top: auto;
	bottom: 0;
	left: 0;
	width: var(--diagram-stroke);
	height: clamp(44px, 5.7vh, 60px);
	background: rgb(var(--drop-ink));
	transform: translate3d(-50%, var(--drop-start), 0);
	visibility: hidden;
}

.intro-ripples {
	position: absolute;
	top: 0;
	left: 0;
	width: calc(var(--ripple-size) * 0.025);
	height: calc(var(--ripple-size) * 0.009375);
	overflow: visible;
	transform: translate(-50%, -50%);
	transform-origin: 50% 50%;
	visibility: hidden;
	will-change: width, height;
}

.intro-ripple-line {
	position: absolute;
	border: var(--diagram-stroke) solid rgb(var(--drop-ink));
	border-radius: 50%;
	opacity: 1;
}

.intro-ripple-line--outer {
	inset: 0;
}

.intro-ripple-line--inner {
	top: 50%;
	left: 50%;
	width: 70.8333%;
	height: 70.8333%;
	transform: translate(-50%, -50%);
}

.has-intro .site-view {
	opacity: 0;
}

.intro-running .intro-drop {
	animation: drop var(--drop-duration) linear var(--drop-delay) both;
}

.intro-running .intro-ripples {
	animation: ripple-symbol var(--ripple-duration) linear var(--ripple-delay) forwards;
}

.intro-running .intro {
	animation: intro-exit var(--reveal-duration) linear var(--reveal-delay) both;
}

.intro-running .site-view {
	animation: site-reveal var(--reveal-duration) cubic-bezier(0.22, 0.61, 0.36, 1) var(--reveal-delay) both;
}

@keyframes drop {
	0% {
		transform: translate3d(-50%, var(--drop-start), 0);
		visibility: visible;
	}
	100% {
		transform: translate3d(-50%, 0, 0);
		visibility: hidden;
	}
}

@keyframes ripple-symbol {
	0% {
		width: calc(var(--ripple-size) * 0.025);
		height: calc(var(--ripple-size) * 0.009375);
		visibility: visible;
	}
	100% {
		width: var(--ripple-size);
		height: calc(var(--ripple-size) * 0.375);
		visibility: visible;
	}
}

@keyframes intro-exit {
	0% {
		opacity: 1;
	}
	100% {
		opacity: 0;
	}
}

@keyframes site-reveal {
	0% {
		transform: scale(0.999);
		opacity: 0;
	}
	30% {
		opacity: 0.06;
	}
	100% {
		transform: scale(1);
		opacity: 1;
	}
}

.intro-complete .intro {
	display: none;
}

.intro-complete .site-view {
	transform: none;
	opacity: 1;
}

@media (max-width: 640px) {
	:root {
		--impact-y: 48svh;
		--drop-start: calc(-1 * (var(--impact-y) + 64px));
		--ripple-size: 164vmax;
	}

	.site-header {
		top: 28px;
		right: 22px;
		left: 22px;
		justify-content: center;
	}

	.site-nav {
		width: 100%;
		justify-content: space-between;
		gap: 0;
		font-size: 8px;
		letter-spacing: 0.12em;
	}

	.site-main {
		padding-top: 0;
	}

	.site-name {
		font-size: clamp(21px, 6.2vw, 26px);
		letter-spacing: 0.13em;
		text-indent: 0.13em;
	}

	.intro-drop {
		height: clamp(42px, 5.5vh, 50px);
	}
}

@media (prefers-reduced-motion: reduce) {
	.has-intro .intro,
	.intro {
		display: none !important;
	}

	.has-intro .site-view,
	.intro-running .site-view,
	.site-view {
		animation: none !important;
		transform: none !important;
		opacity: 1 !important;
	}
}