@import url('https://fonts.googleapis.com/css2?family=Plus+Jakarta+Sans:wght@400;500;600;700;800&display=swap');

/* Smooth native crossfade between pages, where supported. No-op elsewhere. */
@view-transition {
	navigation: auto;
}

/* ---------- Tokens ---------- */
:root {
	--primary: #1E3A8A;
	--primary-foreground: #FFFFFF;
	--secondary: #3B82F6;
	--accent: #7C3AED;
	--bg: #F8FAFC;
	--surface: #FFFFFF;
	--text: #0F172A;
	--text-muted: #475569;
	--border: #E2E8F0;
	--ring: #1E3A8A;
	--destructive: #DC2626;

	--radius-sm: 8px;
	--radius-md: 14px;
	--radius-lg: 20px;
	--shadow-sm: 0 1px 2px rgba(15, 23, 42, 0.06);
	--shadow-md: 0 8px 24px -8px rgba(15, 23, 42, 0.15);
	--shadow-lg: 0 20px 45px -15px rgba(30, 58, 138, 0.25);

	--space-1: 4px;
	--space-2: 8px;
	--space-3: 12px;
	--space-4: 16px;
	--space-6: 24px;
	--space-8: 32px;
	--space-12: 48px;
	--space-16: 64px;
	--space-24: 96px;

	--max-width: 1200px;
}

/* ---------- Reset ---------- */
*, *::before, *::after { box-sizing: border-box; }
html { scroll-behavior: smooth; }
body {
	margin: 0;
	font-family: 'Plus Jakarta Sans', -apple-system, BlinkMacSystemFont, 'Segoe UI', sans-serif;
	font-size: 16px;
	line-height: 1.6;
	color: var(--text);
	background: var(--bg);
	-webkit-font-smoothing: antialiased;
}
img, svg { display: block; max-width: 100%; }
a { color: inherit; text-decoration: none; }
ul { margin: 0; padding: 0; list-style: none; }
h1, h2, h3, p { margin: 0; }
button { font: inherit; cursor: pointer; }
input { font: inherit; }

@media (prefers-reduced-motion: reduce) {
	*, *::before, *::after {
		animation-duration: 0.01ms !important;
		animation-iteration-count: 1 !important;
		transition-duration: 0.01ms !important;
		transition-delay: 0ms !important;
		scroll-behavior: auto !important;
	}
	::view-transition-group(*),
	::view-transition-old(*),
	::view-transition-new(*) {
		animation: none !important;
	}
}

:focus-visible {
	outline: 2px solid var(--ring);
	outline-offset: 2px;
	border-radius: var(--radius-sm);
}

.visually-hidden {
	position: absolute;
	width: 1px; height: 1px;
	padding: 0; margin: -1px;
	overflow: hidden;
	clip: rect(0, 0, 0, 0);
	white-space: nowrap;
	border: 0;
}

.skip-link {
	position: absolute;
	left: var(--space-4);
	top: -48px;
	background: var(--primary);
	color: var(--primary-foreground);
	padding: var(--space-2) var(--space-4);
	border-radius: var(--radius-sm);
	z-index: 100;
	transition: top 150ms ease-out;
}
.skip-link:focus { top: var(--space-4); }

/* ---------- Motion ---------- */
.reveal {
	opacity: 0;
	transform: translateY(20px);
	transition: opacity 400ms ease-out, transform 400ms ease-out;
}
.reveal.is-visible {
	opacity: 1;
	transform: translateY(0);
}
.reveal-delay-1 { transition-delay: 80ms; }
.reveal-delay-2 { transition-delay: 160ms; }
.reveal-delay-3 { transition-delay: 240ms; }

.card-grid .reveal:nth-child(1) { transition-delay: 0ms; }
.card-grid .reveal:nth-child(2) { transition-delay: 60ms; }
.card-grid .reveal:nth-child(3) { transition-delay: 120ms; }
.card-grid .reveal:nth-child(4) { transition-delay: 180ms; }
.card-grid .reveal:nth-child(n+5) { transition-delay: 240ms; }

.value-grid .reveal:nth-child(1) { transition-delay: 0ms; }
.value-grid .reveal:nth-child(2) { transition-delay: 100ms; }
.value-grid .reveal:nth-child(3) { transition-delay: 200ms; }

.feature-list .reveal:nth-child(1) { transition-delay: 0ms; }
.feature-list .reveal:nth-child(2) { transition-delay: 70ms; }
.feature-list .reveal:nth-child(3) { transition-delay: 140ms; }
.feature-list .reveal:nth-child(n+4) { transition-delay: 210ms; }

/* ---------- Layout ---------- */
.container {
	width: 100%;
	max-width: var(--max-width);
	margin-inline: auto;
	padding-inline: var(--space-6);
}
section { padding-block: var(--space-16); }
.section-head { max-width: 640px; margin-bottom: var(--space-8); }
.section-head h2 { font-size: clamp(1.5rem, 1.2rem + 1.2vw, 2rem); font-weight: 800; letter-spacing: -0.02em; }
.section-head p { color: var(--text-muted); margin-top: var(--space-2); }
.section-head.center { max-width: 640px; margin-inline: auto; text-align: center; }

/* ---------- Header ---------- */
.site-header {
	position: sticky;
	top: 0;
	z-index: 50;
	background: rgba(248, 250, 252, 0.85);
	backdrop-filter: blur(10px);
	border-bottom: 1px solid var(--border);
}
.header-inner {
	display: flex;
	align-items: center;
	justify-content: space-between;
	gap: var(--space-4);
	padding-block: var(--space-4);
}
.logo {
	font-size: 1.25rem;
	font-weight: 800;
	letter-spacing: -0.02em;
	color: var(--text);
}
.logo-accent { color: var(--accent); }

.site-nav {
	display: flex;
	align-items: center;
	gap: var(--space-6);
}
.nav-link {
	font-weight: 500;
	color: var(--text-muted);
	padding: var(--space-2) 0;
	border-bottom: 2px solid transparent;
	transition: color 150ms ease-out, border-color 150ms ease-out;
}
.nav-link:hover { color: var(--text); }
.nav-link[aria-current="page"] {
	color: var(--primary);
	border-bottom-color: var(--primary);
}

.nav-toggle {
	display: none;
	align-items: center;
	justify-content: center;
	width: 44px;
	height: 44px;
	background: none;
	border: 1px solid var(--border);
	border-radius: var(--radius-sm);
	color: var(--text);
}

@media (max-width: 720px) {
	.nav-toggle { display: inline-flex; }
	.site-nav {
		position: absolute;
		top: 100%;
		left: 0;
		right: 0;
		flex-direction: column;
		align-items: stretch;
		gap: 0;
		background: var(--surface);
		border-bottom: 1px solid var(--border);
		box-shadow: var(--shadow-md);
		max-height: 0;
		overflow: hidden;
		visibility: hidden;
		transition: max-height 200ms ease-out, visibility 200ms ease-out;
	}
	.site-nav.is-open { max-height: 320px; visibility: visible; }
	.nav-link {
		padding: var(--space-4) var(--space-6);
		border-bottom: 1px solid var(--border);
		border-left: 3px solid transparent;
	}
	.nav-link[aria-current="page"] { border-left-color: var(--primary); border-bottom-color: var(--border); }
}

/* ---------- Buttons ---------- */
.btn {
	display: inline-flex;
	align-items: center;
	gap: var(--space-2);
	padding: var(--space-3) var(--space-6);
	border-radius: var(--radius-sm);
	font-weight: 600;
	border: 1px solid transparent;
	transition: transform 150ms ease-out, box-shadow 150ms ease-out, background 150ms ease-out;
	min-height: 44px;
}
.btn-primary {
	background: var(--primary);
	color: var(--primary-foreground);
	box-shadow: var(--shadow-sm);
}
.btn-primary:hover { box-shadow: var(--shadow-md); transform: translateY(-1px); }
.btn:active { transform: scale(0.96); }
.btn-secondary {
	background: var(--surface);
	color: var(--text);
	border-color: var(--border);
}
.btn-secondary:hover { border-color: var(--secondary); color: var(--primary); }

/* ---------- Hero ---------- */
.hero {
	padding-block: var(--space-24) var(--space-16);
	text-align: center;
}
.hero h1 {
	font-size: clamp(2rem, 1.5rem + 2.5vw, 3.25rem);
	font-weight: 800;
	letter-spacing: -0.03em;
	max-width: 780px;
	margin-inline: auto;
}
.hero .accent { color: var(--accent); }
.hero p {
	color: var(--text-muted);
	font-size: 1.125rem;
	max-width: 560px;
	margin: var(--space-4) auto 0;
}

.search-form {
	display: flex;
	gap: var(--space-2);
	max-width: 560px;
	margin: var(--space-8) auto 0;
	background: var(--surface);
	border: 1px solid var(--border);
	border-radius: var(--radius-md);
	padding: var(--space-2);
	box-shadow: var(--shadow-sm);
}
.search-form input {
	flex: 1;
	border: none;
	background: none;
	padding: var(--space-2) var(--space-3);
	font-size: 1rem;
	color: var(--text);
	min-width: 0;
}
.search-form input:focus { outline: none; }
.search-form input::placeholder { color: var(--text-muted); }

.page-hero {
	padding-block: var(--space-16) var(--space-8);
}
.page-hero h1 {
	font-size: clamp(1.75rem, 1.4rem + 1.5vw, 2.5rem);
	font-weight: 800;
	letter-spacing: -0.02em;
}
.page-hero p {
	color: var(--text-muted);
	max-width: 620px;
	margin-top: var(--space-2);
	font-size: 1.05rem;
}

/* ---------- Chips ---------- */
.chip-row {
	display: flex;
	flex-wrap: wrap;
	gap: var(--space-2);
	margin-top: var(--space-6);
}
.chip {
	padding: var(--space-2) var(--space-4);
	border-radius: 999px;
	border: 1px solid var(--border);
	background: var(--surface);
	color: var(--text-muted);
	font-size: 0.9rem;
	font-weight: 500;
	min-height: 40px;
	transition: background 150ms ease-out, color 150ms ease-out, border-color 150ms ease-out, transform 150ms ease-out;
}
.chip:hover { border-color: var(--secondary); color: var(--primary); }
.chip:active { transform: scale(0.96); }
.chip[aria-pressed="true"] {
	background: var(--primary);
	border-color: var(--primary);
	color: var(--primary-foreground);
}

.filter-bar {
	display: flex;
	flex-direction: column;
	gap: var(--space-4);
	margin-bottom: var(--space-8);
}
.directory-search {
	display: flex;
	align-items: center;
	gap: var(--space-2);
	background: var(--surface);
	border: 1px solid var(--border);
	border-radius: var(--radius-sm);
	padding: var(--space-2) var(--space-4);
	max-width: 420px;
}
.directory-search input {
	border: none;
	background: none;
	flex: 1;
	padding: var(--space-2) 0;
	color: var(--text);
}
.directory-search input:focus { outline: none; }
.directory-search svg { color: var(--text-muted); flex-shrink: 0; }

/* ---------- Cards ---------- */
.card-grid {
	display: grid;
	grid-template-columns: repeat(auto-fill, minmax(260px, 1fr));
	gap: var(--space-6);
}
.card {
	background: var(--surface);
	border: 1px solid var(--border);
	border-radius: var(--radius-lg);
	padding: var(--space-6);
	display: flex;
	flex-direction: column;
	gap: var(--space-3);
	box-shadow: var(--shadow-sm);
	transition: box-shadow 200ms ease-out, transform 200ms ease-out;
}
.card:hover { box-shadow: var(--shadow-md); transform: translateY(-2px); }
.card[hidden] { display: none; }

.card-top {
	display: flex;
	align-items: center;
	justify-content: space-between;
	gap: var(--space-2);
}
.avatar {
	width: 40px;
	height: 40px;
	border-radius: var(--radius-sm);
	display: flex;
	align-items: center;
	justify-content: center;
	color: #fff;
	font-weight: 700;
	flex-shrink: 0;
	transition: transform 250ms ease-out;
}
.card:hover .avatar { transform: scale(1.08) rotate(-3deg); }
.avatar-a { background: var(--primary); }
.avatar-b { background: var(--accent); }
.avatar-c { background: var(--secondary); }
.avatar-d { background: #0EA5A5; }

.tag {
	font-size: 0.75rem;
	font-weight: 600;
	color: var(--primary);
	background: #EFF4FF;
	border: 1px solid var(--border);
	padding: var(--space-1) var(--space-2);
	border-radius: 999px;
	white-space: nowrap;
}

.card-title { font-size: 1.15rem; font-weight: 700; }
.card-desc { color: var(--text-muted); font-size: 0.95rem; flex: 1; }
.card-link {
	display: inline-flex;
	align-items: center;
	gap: var(--space-1);
	font-weight: 600;
	color: var(--primary);
	margin-top: auto;
}
.card-link svg { width: 16px; height: 16px; transition: transform 200ms ease-out; }
.card-link:hover { color: var(--accent); }
.card-link:hover svg { transform: translate(2px, -2px); }

.empty-state {
	text-align: center;
	padding: var(--space-16) var(--space-4);
	color: var(--text-muted);
}

/* ---------- Value props ---------- */
.value-grid {
	display: grid;
	grid-template-columns: repeat(auto-fit, minmax(220px, 1fr));
	gap: var(--space-8);
}
.value-item { text-align: left; }
.value-icon {
	width: 48px;
	height: 48px;
	border-radius: var(--radius-sm);
	background: #EFF4FF;
	color: var(--primary);
	display: flex;
	align-items: center;
	justify-content: center;
	margin-bottom: var(--space-4);
	transition: transform 250ms ease-out, background 250ms ease-out;
}
.value-item:hover .value-icon { transform: scale(1.1) rotate(-4deg); background: #E0E7FF; }
.value-item h3 { font-size: 1.1rem; font-weight: 700; margin-bottom: var(--space-1); }
.value-item p { color: var(--text-muted); font-size: 0.95rem; }

/* ---------- CTA ---------- */
@keyframes gradientFlow {
	0% { background-position: 0% 50%; }
	50% { background-position: 100% 50%; }
	100% { background-position: 0% 50%; }
}
.cta {
	background: linear-gradient(120deg, var(--primary), #1e40af 45%, var(--accent), #1e40af 75%, var(--primary));
	background-size: 300% 300%;
	animation: gradientFlow 12s ease-in-out infinite;
	border-radius: var(--radius-lg);
	padding: var(--space-16) var(--space-8);
	text-align: center;
	color: var(--primary-foreground);
	box-shadow: var(--shadow-lg);
}
.cta h2 { font-size: clamp(1.5rem, 1.3rem + 1vw, 2rem); font-weight: 800; }
.cta p { color: rgba(255,255,255,0.85); margin-top: var(--space-2); max-width: 480px; margin-inline: auto; }
.cta .btn-primary { background: #fff; color: var(--primary); margin-top: var(--space-6); }
.cta .btn-primary:hover { box-shadow: 0 12px 30px rgba(0,0,0,0.2); }

/* ---------- Footer ---------- */
.site-footer {
	border-top: 1px solid var(--border);
	padding-block: var(--space-12);
	margin-top: var(--space-16);
}
.footer-inner {
	display: flex;
	flex-wrap: wrap;
	justify-content: space-between;
	align-items: center;
	gap: var(--space-4);
}
.footer-nav {
	display: flex;
	gap: var(--space-6);
	flex-wrap: wrap;
}
.footer-nav a { color: var(--text-muted); font-weight: 500; }
.footer-nav a:hover { color: var(--primary); }
.footer-meta { color: var(--text-muted); font-size: 0.9rem; }

/* ---------- Placeholder notice ---------- */
.notice-banner {
	display: flex;
	align-items: flex-start;
	gap: var(--space-3);
	background: #FFFBEB;
	border: 1px dashed #F59E0B;
	color: #92400E;
	border-radius: var(--radius-md);
	padding: var(--space-4) var(--space-6);
	font-size: 0.9rem;
	margin-bottom: var(--space-8);
}
.notice-banner svg { flex-shrink: 0; margin-top: 2px; }
.notice-banner strong { display: block; margin-bottom: 2px; }

/* ---------- Extension detail page ---------- */
.back-link {
	display: inline-flex;
	align-items: center;
	gap: var(--space-1);
	color: var(--text-muted);
	font-weight: 500;
	margin-bottom: var(--space-6);
}
.back-link:hover { color: var(--primary); }
.back-link svg { width: 16px; height: 16px; }

.ext-hero {
	display: flex;
	flex-wrap: wrap;
	align-items: center;
	gap: var(--space-6);
	padding-bottom: var(--space-8);
	border-bottom: 1px solid var(--border);
	margin-bottom: var(--space-8);
}
.ext-icon-lg {
	width: 72px;
	height: 72px;
	border-radius: var(--radius-md);
	display: flex;
	align-items: center;
	justify-content: center;
	color: #fff;
	font-weight: 700;
	font-size: 1.75rem;
	flex-shrink: 0;
}
.ext-hero-text { flex: 1; min-width: 240px; }
.ext-hero-text h1 { font-size: clamp(1.5rem, 1.3rem + 1vw, 2rem); font-weight: 800; letter-spacing: -0.02em; }
.ext-hero-text p { color: var(--text-muted); margin-top: var(--space-1); font-size: 1.05rem; }
.ext-hero-actions { display: flex; flex-direction: column; align-items: flex-start; gap: var(--space-2); }
.ext-hero-actions small { color: var(--text-muted); }

.feature-list { display: flex; flex-direction: column; gap: var(--space-3); margin-top: var(--space-4); }
.feature-list li {
	display: flex;
	align-items: flex-start;
	gap: var(--space-3);
	color: var(--text-muted);
}
.feature-list svg {
	width: 20px; height: 20px;
	color: var(--primary);
	flex-shrink: 0;
	margin-top: 2px;
}

.callout {
	display: flex;
	gap: var(--space-3);
	align-items: flex-start;
	background: #EFF4FF;
	border: 1px solid var(--border);
	border-radius: var(--radius-md);
	padding: var(--space-4) var(--space-6);
	margin-top: var(--space-8);
}
.callout svg { width: 22px; height: 22px; color: var(--primary); flex-shrink: 0; margin-top: 2px; }
.callout p { color: var(--text); font-size: 0.95rem; }
.callout a { color: var(--primary); font-weight: 600; }

/* ---------- About page ---------- */
.prose { max-width: 680px; }
.prose p { color: var(--text-muted); margin-bottom: var(--space-4); font-size: 1.05rem; }
.prose h2 { font-size: 1.3rem; font-weight: 700; margin-top: var(--space-8); margin-bottom: var(--space-3); }

@media (max-width: 640px) {
	section { padding-block: var(--space-12); }
	.hero { padding-block: var(--space-16) var(--space-8); }
}