:root {
	color-scheme: light;
	--background: #f7f8fb;
	--surface: #ffffff;
	--surface-soft: #f0f2f7;
	--text: #171923;
	--muted: #62697a;
	--border: #dfe3eb;
	--accent: #4e67c8;
	--accent-soft: #e9edff;
	--green: #33835c;
	--green-soft: #e6f4ec;
	--shadow: 0 20px 55px rgba(34, 43, 76, 0.08);
	font-family:
		Inter, 'Noto Sans JP', 'Hiragino Kaku Gothic ProN', 'Yu Gothic', system-ui, sans-serif;
}

:root[data-theme='dark'] {
	color-scheme: dark;
	--background: #11131a;
	--surface: #191c25;
	--surface-soft: #222632;
	--text: #f3f5fa;
	--muted: #adb4c4;
	--border: #303645;
	--accent: #9cafff;
	--accent-soft: #282f4c;
	--green: #7fd4a7;
	--green-soft: #20392f;
	--shadow: 0 20px 55px rgba(0, 0, 0, 0.24);
}

* {
	box-sizing: border-box;
}

html {
	scroll-behavior: smooth;
}

body {
	min-width: 18rem;
	margin: 0;
	background: var(--background);
	color: var(--text);
	font-size: 16px;
	line-height: 1.7;
}

a {
	color: inherit;
}

.skip-link {
	position: fixed;
	top: 0.5rem;
	left: 0.5rem;
	z-index: 100;
	transform: translateY(-200%);
	border-radius: 0.5rem;
	background: var(--text);
	padding: 0.6rem 0.8rem;
	color: var(--background);
}

.skip-link:focus {
	transform: none;
}

.sr-only {
	position: absolute;
	width: 1px;
	height: 1px;
	overflow: hidden;
	clip: rect(0, 0, 0, 0);
	white-space: nowrap;
}

.site-header,
main,
.site-footer {
	width: min(calc(100% - 2rem), 72rem);
	margin-inline: auto;
}

.site-header {
	display: flex;
	min-height: 5rem;
	align-items: center;
	justify-content: space-between;
	gap: 1rem;
}

.brand {
	display: inline-flex;
	align-items: center;
	gap: 0.65rem;
	font-weight: 760;
	letter-spacing: -0.02em;
	text-decoration: none;
}

.brand-mark {
	display: grid;
	width: 2.3rem;
	height: 2.3rem;
	place-items: center;
	border: 1px solid var(--border);
	border-radius: 0.7rem;
	background: var(--surface);
	color: var(--accent);
	font-size: 1.1rem;
}

.brand small {
	display: block;
	margin-top: -0.25rem;
	color: var(--muted);
	font-size: 0.55rem;
	letter-spacing: 0.16em;
}

.primary-nav {
	display: flex;
	align-items: center;
	gap: 1.1rem;
	margin-left: auto;
}

.primary-nav a {
	color: var(--muted);
	font-size: 0.78rem;
	font-weight: 700;
	text-decoration: none;
}

.primary-nav a:hover {
	color: var(--text);
}

.header-actions {
	display: flex;
	align-items: center;
	gap: 0.5rem;
}

select,
.icon-button {
	min-height: 2.35rem;
	border: 1px solid var(--border);
	border-radius: 0.6rem;
	background: var(--surface);
	color: var(--text);
	font: inherit;
}

select {
	padding: 0.35rem 2rem 0.35rem 0.7rem;
	font-size: 0.78rem;
}

.icon-button {
	width: 2.35rem;
	cursor: pointer;
}

.hero {
	position: relative;
	display: grid;
	grid-template-columns: minmax(0, 1.35fr) minmax(15rem, 0.65fr);
	align-items: center;
	gap: 3rem;
	min-height: 30rem;
	overflow: hidden;
	border: 1px solid var(--border);
	border-radius: 1.4rem;
	background:
		radial-gradient(
			circle at 82% 18%,
			color-mix(in srgb, var(--accent) 15%, transparent),
			transparent 32%
		),
		var(--surface);
	padding: clamp(2rem, 6vw, 5rem);
	box-shadow: var(--shadow);
}

.eyebrow,
.card-label {
	margin: 0;
	color: var(--accent);
	font-size: 0.7rem;
	font-weight: 800;
	letter-spacing: 0.14em;
}

.hero h1 {
	margin: 0.8rem 0 0;
	font-size: clamp(1.5rem, 3vw, 2.4rem);
	line-height: 1.08;
	letter-spacing: -0.065em;
}

.hero-lead {
	max-width: 43rem;
	margin: 1.4rem 0 0;
	color: var(--muted);
	font-size: clamp(0.95rem, 1.6vw, 1.08rem);
}

.hero-actions {
	display: flex;
	flex-wrap: wrap;
	gap: 0.7rem;
	margin-top: 1.8rem;
}

.button {
	display: inline-flex;
	min-height: 3rem;
	align-items: center;
	justify-content: space-between;
	gap: 1.2rem;
	border: 1px solid var(--border);
	border-radius: 0.75rem;
	background: var(--surface);
	padding: 0.65rem 1rem;
	font-size: 0.82rem;
	font-weight: 750;
	text-decoration: none;
	transition:
		transform 150ms ease,
		background-color 150ms ease;
}

.button:hover,
.card-link:hover {
	transform: translateY(-2px);
}

.button:focus-visible,
.card-link:focus-visible,
.tool-card:focus-visible,
.primary-nav a:focus-visible,
select:focus-visible,
.icon-button:focus-visible,
.site-footer a:focus-visible {
	outline: 3px solid color-mix(in srgb, var(--accent) 55%, transparent);
	outline-offset: 3px;
}

.hero-visual {
	position: relative;
	min-height: 17rem;
}

.portal-core,
.site-node {
	position: absolute;
	display: grid;
	place-items: center;
	border: 1px solid var(--border);
	background: var(--surface);
	box-shadow: var(--shadow);
}

.portal-core {
	top: 50%;
	left: 50%;
	width: 6.5rem;
	height: 6.5rem;
	transform: translate(-50%, -50%);
	border-radius: 1.6rem;
	color: var(--accent);
	font-size: 2.5rem;
	font-weight: 800;
}

.site-node {
	width: 4rem;
	height: 4rem;
	border-radius: 50%;
	font-size: 0.75rem;
	font-weight: 750;
}

.node-www {
	top: 7%;
	right: 3%;
	color: var(--green);
}

.node-util {
	bottom: 5%;
	left: 1%;
	color: var(--accent);
}

.orbit {
	position: absolute;
	top: 50%;
	left: 50%;
	border: 1px solid var(--border);
	border-radius: 50%;
	transform: translate(-50%, -50%) rotate(-18deg);
}

.orbit-one {
	width: 15rem;
	height: 8rem;
}

.orbit-two {
	width: 10rem;
	height: 16rem;
	transform: translate(-50%, -50%) rotate(32deg);
}

.section {
	padding: clamp(4rem, 8vw, 7rem) clamp(0rem, 2vw, 1.5rem) 0;
}

.section-heading {
	margin-bottom: 1.7rem;
}

.section h2 {
	margin: 0;
	font-size: clamp(1.5rem, 3vw, 2.1rem);
	letter-spacing: -0.045em;
}

.section-heading p,
.about > div > p:not(.card-label) {
	margin: 0.4rem 0 0;
	color: var(--muted);
}

.site-grid,
.product-grid {
	display: grid;
	grid-template-columns: repeat(2, minmax(0, 1fr));
	gap: 1rem;
}

.site-card {
	display: flex;
	min-width: 0;
	flex-direction: column;
	border: 1px solid var(--border);
	border-radius: 1rem;
	background: var(--surface);
	padding: clamp(1.4rem, 3.5vw, 2.4rem);
}

.service-icon {
	display: grid;
	width: 3.3rem;
	height: 3.3rem;
	place-items: center;
	margin-bottom: 1.2rem;
	border-radius: 0.85rem;
	font-size: 0.8rem;
	font-weight: 800;
}

.service-icon-green {
	background: var(--green-soft);
	color: var(--green);
}

.service-icon-blue {
	background: var(--accent-soft);
	color: var(--accent);
}

.site-card h3 {
	margin: 0.35rem 0 0;
	overflow-wrap: anywhere;
	font-size: clamp(1.15rem, 2vw, 1.45rem);
	letter-spacing: -0.03em;
}

.site-card h3 + p {
	margin: 0.8rem 0 0;
	color: var(--muted);
}

.topic-list {
	display: flex;
	flex-wrap: wrap;
	gap: 0.45rem;
	margin: 1rem 0 0;
	padding: 0;
	list-style: none;
}

.topic-list li {
	border: 1px solid var(--border);
	border-radius: 999px;
	background: var(--surface-soft);
	padding: 0.3rem 0.65rem;
	color: var(--muted);
	font-size: 0.75rem;
	font-weight: 650;
}

.card-link {
	display: inline-flex;
	align-items: center;
	align-self: flex-start;
	gap: 0.5rem;
	margin-top: auto;
	padding-top: 1.5rem;
	font-size: 0.82rem;
	font-weight: 780;
	text-underline-offset: 0.2rem;
	transition: transform 150ms ease;
}

.content-card {
	display: flex;
	min-width: 0;
	flex-direction: column;
	border: 1px solid var(--border);
	border-radius: 1rem;
	background: var(--surface);
	padding: clamp(1.4rem, 3.5vw, 2.4rem);
}

.content-card h3 {
	margin: 0.35rem 0 0;
	font-size: clamp(1.2rem, 2vw, 1.55rem);
	letter-spacing: -0.035em;
}

.content-card h3 + p {
	margin: 0.85rem 0 0;
	color: var(--muted);
}

.detail-list {
	display: grid;
	gap: 0.5rem;
	margin: 1.1rem 0 0;
	padding-left: 1.2rem;
	color: var(--muted);
	font-size: 0.84rem;
}

.detail-list li::marker {
	color: var(--accent);
}

.tool-grid {
	display: grid;
	grid-template-columns: repeat(3, minmax(0, 1fr));
	gap: 0.75rem;
}

.tool-card {
	display: block;
	min-width: 0;
	border: 1px solid var(--border);
	border-radius: 0.85rem;
	background: var(--surface);
	padding: 1.15rem;
	text-decoration: none;
	transition:
		transform 150ms ease,
		border-color 150ms ease,
		box-shadow 150ms ease;
}

.tool-card:hover {
	transform: translateY(-2px);
	border-color: color-mix(in srgb, var(--accent) 45%, var(--border));
	box-shadow: 0 12px 28px color-mix(in srgb, var(--accent) 9%, transparent);
}

.tool-card h3 {
	margin: 0;
	font-size: 0.96rem;
}

.tool-card p {
	margin: 0.45rem 0 0;
	color: var(--muted);
	font-size: 0.8rem;
	line-height: 1.65;
}

.about {
	display: grid;
	grid-template-columns: minmax(0, 1.25fr) minmax(17rem, 0.75fr);
	align-items: start;
	gap: 3rem;
}

.about h2 {
	margin-top: 0.45rem;
}

.about > div > p:not(.card-label) + p {
	margin-top: 0.9rem;
}

.operator-card {
	overflow: hidden;
	margin: 0;
	border: 1px solid var(--border);
	border-radius: 0.9rem;
	background: var(--surface);
}

.operator-card > div {
	display: grid;
	grid-template-columns: 42% minmax(0, 1fr);
}

.operator-card > div + div {
	border-top: 1px solid var(--border);
}

.operator-card dt,
.operator-card dd {
	margin: 0;
	padding: 0.8rem 1rem;
	font-size: 0.8rem;
}

.operator-card dt {
	background: var(--surface-soft);
	color: var(--muted);
	font-weight: 700;
}

.site-footer {
	display: flex;
	align-items: center;
	justify-content: space-between;
	gap: 1rem;
	margin-top: clamp(4rem, 8vw, 7rem);
	border-top: 1px solid var(--border);
	padding-block: 1.5rem 2.5rem;
	color: var(--muted);
	font-size: 0.76rem;
}

.site-footer p {
	margin: 0;
}

.site-footer nav {
	display: flex;
	flex-wrap: wrap;
	gap: 1rem;
}

@media (max-width: 52rem) {
	.site-header {
		flex-wrap: wrap;
		padding-block: 1rem;
	}

	.primary-nav {
		order: 3;
		width: 100%;
		justify-content: center;
		margin-left: 0;
		border-top: 1px solid var(--border);
		padding-top: 0.8rem;
	}

	.hero {
		grid-template-columns: minmax(0, 1fr);
		min-height: auto;
	}

	.hero-visual {
		display: none;
	}

	.about {
		grid-template-columns: minmax(0, 1fr);
		gap: 1.5rem;
	}

	.product-grid {
		grid-template-columns: minmax(0, 1fr);
	}

	.tool-grid {
		grid-template-columns: repeat(2, minmax(0, 1fr));
	}
}

@media (max-width: 40rem) {
	.site-header,
	main,
	.site-footer {
		width: min(calc(100% - 1.2rem), 72rem);
	}

	.brand small {
		display: none;
	}

	.hero {
		padding: 1.5rem;
	}

	.hero h1 {
		font-size: clamp(1.5rem, 7vw, 2.1rem);
	}

	.hero-actions,
	.site-footer {
		align-items: stretch;
		flex-direction: column;
	}

	.button {
		width: 100%;
	}

	.site-grid,
	.tool-grid {
		grid-template-columns: minmax(0, 1fr);
	}
}

@media (prefers-reduced-motion: reduce) {
	html {
		scroll-behavior: auto;
	}

	.button,
	.card-link,
	.tool-card {
		transition: none;
	}
}