:root {
	--red: #dc2626;
	--blue: #1d4ed8;
	--bg: #0f0f0f;
	--bg-alt: #161616;
	--border: rgba(255, 255, 255, 0.08);
	--text: #f5f5f5;
	--muted: #a3a3a3;
	--code-bg: #1a1a1a;
}

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

body {
	font-family: 'Inter', -apple-system, sans-serif;
	background: var(--bg);
	color: var(--text);
	font-size: 1rem;
	line-height: 1.7;
}

/* ── HERO ─────────────────────────────────── */

.hero {
	position: relative;
	display: flex;
	align-items: center;
	justify-content: center;
	text-align: center;
	padding: 5rem 2rem;
	overflow: hidden;
}

.hero-bg {
	position: absolute;
	inset: 0;
	z-index: 0;
}

.circle {
	position: absolute;
	border-radius: 50%;
	filter: blur(80px);
	opacity: 0.3;
}

.c1 { width: 500px; height: 500px; background: var(--red);  top: -150px; left: -100px; animation: drift 8s ease-in-out infinite alternate; }
.c2 { width: 450px; height: 450px; background: var(--blue); bottom: -100px; right: -80px; animation: drift 10s ease-in-out infinite alternate-reverse; }
.c3 { width: 250px; height: 250px; background: #7c3aed;     top: 50%; left: 50%; transform: translate(-50%, -50%); animation: drift 6s ease-in-out infinite alternate; }

@keyframes drift {
	from { transform: translate(0, 0); }
	to   { transform: translate(30px, 20px); }
}

.hero-content {
	position: relative;
	z-index: 1;
	display: flex;
	flex-direction: column;
	align-items: center;
	gap: 1.2rem;
}

.badge {
	background: rgba(255, 255, 255, 0.07);
	border: 1px solid var(--border);
	padding: 0.35rem 1rem;
	border-radius: 999px;
	font-size: 0.82rem;
	color: var(--muted);
}

.hero h1 {
	font-family: 'Noto Sans JP', sans-serif;
	font-size: clamp(3rem, 10vw, 6rem);
	font-weight: 900;
	letter-spacing: -0.02em;
	line-height: 1;
	background: linear-gradient(135deg, #fff 0%, #dc2626 50%, #1d4ed8 100%);
	-webkit-background-clip: text;
	-webkit-text-fill-color: transparent;
	background-clip: text;
}

.tagline {
	font-size: 0.95rem;
	color: var(--muted);
	max-width: 440px;
	line-height: 1.7;
}

.jp {
	font-family: 'Noto Sans JP', sans-serif;
	font-size: 0.82rem;
	color: #6b7280;
	letter-spacing: 0.05em;
}

.team {
	display: flex;
	gap: 2rem;
	flex-wrap: wrap;
	justify-content: center;
}

.member {
	display: flex;
	flex-direction: column;
	align-items: center;
	gap: 0.4rem;
	width: 150px;
}

.avatar {
	width: 48px;
	height: 48px;
	border-radius: 50%;
	display: flex;
	align-items: center;
	justify-content: center;
	font-family: 'Noto Sans JP', sans-serif;
	font-size: 1.2rem;
	font-weight: 900;
	color: white;
}

.member span {
	font-size: 0.8rem;
	color: var(--muted);
	text-align: center;
	width: 100%;
}

/* ── SECTIONS ─────────────────────────────── */

.section {
	padding: 4rem 2rem;
	background: var(--bg);
}

.section--alt {
	background: var(--bg-alt);
	border-top: 1px solid var(--border);
	border-bottom: 1px solid var(--border);
}

.container {
	max-width: 900px;
	margin: 0 auto;
}

h2 {
	font-family: 'Noto Sans JP', sans-serif;
	font-size: 1.8rem;
	font-weight: 900;
	margin-bottom: 2rem;
	color: var(--text);
}

h3 {
	font-size: 1rem;
	font-weight: 600;
	color: var(--text);
	margin-top: 1.5rem;
	margin-bottom: 0.6rem;
}

p, li, dd {
	color: var(--muted);
	font-size: 0.92rem;
}

ul, ol {
	padding-left: 1.4rem;
	display: flex;
	flex-direction: column;
	gap: 0.4rem;
}

strong {
	color: var(--text);
	font-weight: 600;
}

/* ── CODE ─────────────────────────────────── */

pre {
	background: var(--code-bg);
	border: 1px solid var(--border);
	border-radius: 8px;
	padding: 0.8rem 1.2rem;
	margin: 0.6rem 0;
	overflow-x: auto;
}

code {
	font-family: 'Courier New', monospace;
	font-size: 0.85rem;
	color: #86efac;
}

p code, li code, dd code {
	background: var(--code-bg);
	padding: 0.1em 0.4em;
	border-radius: 4px;
	color: #93c5fd;
	font-size: 0.82rem;
}

.note {
	font-size: 0.82rem;
	color: #6b7280;
	margin-top: 0.4rem;
}

.badge-recommended {
	display: inline-block;
	background: rgba(220, 38, 38, 0.15);
	border: 1px solid rgba(220, 38, 38, 0.3);
	color: #f87171;
	font-size: 0.7rem;
	font-weight: 600;
	padding: 0.15rem 0.5rem;
	border-radius: 999px;
	vertical-align: middle;
	margin-left: 0.5rem;
}

/* ── FEATURES ─────────────────────────────── */

.features-grid {
	display: grid;
	grid-template-columns: repeat(auto-fit, minmax(240px, 1fr));
	gap: 1rem;
}

.feature-card {
	background: rgba(255, 255, 255, 0.03);
	border: 1px solid var(--border);
	border-radius: 10px;
	padding: 1.2rem;
}

.feature-icon {
	font-size: 1.5rem;
	margin-bottom: 0.5rem;
}

.feature-card h3 {
	font-size: 0.92rem;
	font-weight: 600;
	color: var(--text);
	margin-top: 0;
	margin-bottom: 0.3rem;
}

.feature-card p {
	font-size: 0.83rem;
	color: #6b7280;
	line-height: 1.6;
}

/* ── ARCHITECTURE ─────────────────────────── */

.arch-cols {
	display: grid;
	grid-template-columns: 1fr 1fr;
	gap: 2rem;
}

@media (max-width: 640px) {
	.arch-cols { grid-template-columns: 1fr; }
}

dl {
	display: flex;
	flex-direction: column;
	gap: 0.8rem;
}

dt {
	font-size: 0.85rem;
	margin-bottom: 0.1rem;
}

dd {
	margin-left: 0;
	font-size: 0.85rem;
	color: #6b7280;
}

/* ── FOOTER ───────────────────────────────── */

.footer {
	text-align: center;
	padding: 2rem;
	font-size: 0.82rem;
	color: #444;
	border-top: 1px solid var(--border);
}

.footer .jp {
	color: #555;
}