:root {
	--bg: #ffffff;
	--text: #1a1a1a;
	--muted: #6b7280;
	--brand: #0ea5e9;
	--brand-dark: #0284c7;
	--accent: #f59e0b;
	--accent-dark: #d97706;
	--border: #e5e7eb;
	--shadow: rgba(0, 0, 0, 0.1);
	--gradient-start: rgba(14, 165, 233, 0.12);
	--gradient-end: rgba(245, 158, 11, 0.08);
}
@media (prefers-color-scheme: dark) {
	:root {
		--bg: #0b0f14;
		--text: #e5e7eb;
		--muted: #9ca3af;
		--brand: #38bdf8;
		--brand-dark: #0ea5e9;
		--accent: #fbbf24;
		--accent-dark: #f59e0b;
		--border: #1f2937;
		--shadow: rgba(0, 0, 0, 0.3);
		--gradient-start: rgba(56, 189, 248, 0.15);
		--gradient-end: rgba(251, 191, 36, 0.1);
	}
}
html, body { height: 100%; }
body {
	margin: 0;
	padding-top: 5rem; /* Increased to account for potentially taller navigation */
	font-family: system-ui, -apple-system, Segoe UI, Roboto, Ubuntu, Cantarell, Noto Sans, "Helvetica Neue", Arial, "Apple Color Emoji", "Segoe UI Emoji";
	background: var(--bg);
	color: var(--text);
	line-height: 1.6;
	-webkit-font-smoothing: antialiased;
	-moz-osx-font-smoothing: grayscale;
	position: relative;
}
@media (min-width: 640px) {
	body {
		padding-top: 4rem; /* Back to original on larger screens */
	}
}
body::before {
	content: '';
	position: fixed;
	top: 0;
	left: 0;
	right: 0;
	bottom: 0;
	background: 
		radial-gradient(circle at 20% 20%, var(--gradient-start) 0%, transparent 25%),
		radial-gradient(circle at 80% 80%, var(--gradient-end) 0%, transparent 25%),
		radial-gradient(circle at 60% 40%, rgba(14, 165, 233, 0.05) 0%, transparent 20%);
	pointer-events: none;
	z-index: -1;
}
.skip-link {
	position: absolute;
	left: -999px;
	top: -999px;
}
.skip-link:focus {
	left: 1rem;
	top: 1rem;
	background: var(--brand);
	color: #fff;
	padding: .5rem .75rem;
	border-radius: .375rem;
	outline: none;
}
header {
	position: static; /* brand/title is not sticky */
	background: transparent;
}
@media (prefers-color-scheme: dark) {
	header { background: transparent; }
}
.wrap {
	max-width: 960px;
	margin: 0 auto;
	padding: 1rem;
}
.topbar {
	display: flex;
	flex-direction: column;
	align-items: flex-start;
	gap: .5rem;
}
/* Brand/title styling */
.brand { display: flex; align-items: baseline; gap: .5rem; }
.brand a {
	color: var(--text);
	text-decoration: none;
	font-weight: 800;
	letter-spacing: .2px;
	position: relative;
	transition: all 0.3s ease;
}
.brand a::after {
	content: '';
	position: absolute;
	bottom: -2px;
	left: 0;
	width: 0;
	height: 2px;
	background: linear-gradient(90deg, var(--brand), var(--accent));
	transition: width 0.3s ease;
}
.brand a:visited { color: var(--text); }
.brand a:hover, .brand a:focus { 
	color: var(--brand);
	transform: translateY(-1px);
}
.brand a:hover::after, .brand a:focus::after {
	width: 100%;
}
/* Sticky site navigation: only the menu sticks */
.site-nav {
	position: fixed;
	top: 0;
	left: 0;
	right: 0;
	width: 100%;
	z-index: 999;
	background: rgba(255,255,255,.95);
	backdrop-filter: saturate(180%) blur(12px);
	box-shadow: 0 4px 20px var(--shadow);
	border-bottom: 1px solid var(--border);
	transition: all 0.3s ease;
}
.site-nav .wrap {
	display: flex;
	gap: 0.25rem;
	flex-wrap: nowrap;
	align-items: center;
	justify-content: center;
	padding-top: .5rem;
	padding-bottom: .5rem;
	min-height: 3rem;
	overflow-x: auto;
	-webkit-overflow-scrolling: touch;
}
@media (min-width: 640px) {
	.site-nav .wrap {
		justify-content: flex-start;
		gap: 1rem;
		overflow-x: visible;
	}
}
.site-nav a {
	color: var(--muted);
	text-decoration: none;
	font-weight: 600;
	padding: 0.4rem 0.5rem;
	border-radius: 0.5rem;
	position: relative;
	transition: all 0.3s ease;
	overflow: hidden;
	font-size: 0.85rem;
	white-space: nowrap;
	flex-shrink: 0;
}
@media (min-width: 480px) {
	.site-nav a {
		padding: 0.4rem 0.75rem;
		font-size: 0.9rem;
	}
}
@media (min-width: 640px) {
	.site-nav a {
		padding: 0.5rem 1rem;
		font-size: 1rem;
	}
}
.nav-short {
	display: inline;
}
.nav-full {
	display: none;
}
@media (min-width: 480px) {
	.nav-short {
		display: none;
	}
	.nav-full {
		display: inline;
	}
}
.site-nav a::before {
	content: '';
	position: absolute;
	top: 0;
	left: -100%;
	width: 100%;
	height: 100%;
	background: linear-gradient(90deg, transparent, rgba(14, 165, 233, 0.1), transparent);
	transition: left 0.5s ease;
}
.site-nav a:hover::before, .site-nav a:focus::before {
	left: 100%;
}
.site-nav a:hover, .site-nav a:focus { 
	color: var(--brand);
	background: rgba(14, 165, 233, 0.08);
	transform: translateY(-1px);
}
@media (prefers-color-scheme: dark) {
	.site-nav { 
		background: rgba(11,15,20,.95); 
		border-bottom: 1px solid var(--border);
		box-shadow: 0 4px 20px var(--shadow);
	}
}
.hero {
	padding: 2rem 1rem;
	min-height: 80vh;
	min-height: 80svh;
	display: grid;
	align-content: center;
	background: 
		linear-gradient(135deg, var(--gradient-start) 0%, transparent 50%, var(--gradient-end) 100%),
		linear-gradient(180deg, rgba(14,165,233,0.08), transparent 50%);
	position: relative;
	overflow: hidden;
}
.hero::before {
	content: '';
	position: absolute;
	top: -50%;
	left: -50%;
	width: 200%;
	height: 200%;
	background: 
		radial-gradient(circle at 30% 30%, rgba(14, 165, 233, 0.1) 0%, transparent 30%),
		radial-gradient(circle at 70% 70%, rgba(245, 158, 11, 0.08) 0%, transparent 25%);
	animation: float 20s ease-in-out infinite;
	pointer-events: none;
}
@keyframes float {
	0%, 100% { transform: rotate(0deg) translate(0, 0); }
	33% { transform: rotate(1deg) translate(10px, -10px); }
	66% { transform: rotate(-1deg) translate(-5px, 5px); }
}
.hero h1 {
	font-size: clamp(2rem, 4vw, 3rem);
	margin: 0 0 .5rem;
	line-height: 1.1;
	position: relative;
	z-index: 1;
	background: linear-gradient(135deg, var(--text) 0%, var(--brand) 100%);
	-webkit-background-clip: text;
	-webkit-text-fill-color: transparent;
	background-clip: text;
	animation: glow 3s ease-in-out infinite alternate;
}
@keyframes glow {
	from { filter: drop-shadow(0 0 0px var(--brand)); }
	to { filter: drop-shadow(0 0 8px rgba(14, 165, 233, 0.3)); }
}
.hero p { 
	color: var(--muted); 
	max-width: 60ch; 
	position: relative;
	z-index: 1;
	font-size: 1.125rem;
}
main section {
	/* center when short; no extra top whitespace when long */
	padding: 1.5rem 1rem;
	min-height: auto;
	display: flex;
	flex-direction: column;
	justify-content: center;
	scroll-margin-top: 5rem; /* account for potentially taller sticky nav */
}
@media (min-width: 640px) {
	main section {
		scroll-margin-top: 4rem; /* Back to original on larger screens */
		padding: 2rem 1rem;
	}
}
/* auto vertical margins center short content, collapse when long */
main section > .wrap { 
	margin-block: 0;
	position: relative;
}
h2 { 
	font-size: clamp(1.5rem, 2.5vw, 2rem); 
	margin-top: 0;
	position: relative;
	display: inline-block;
}
h2::after {
	content: '';
	position: absolute;
	bottom: -4px;
	left: 0;
	width: 30%;
	height: 3px;
	background: linear-gradient(90deg, var(--brand), var(--accent));
	border-radius: 2px;
}
.lead { font-size: 1.125rem; color: var(--muted); }
ul { 
	padding-left: 1.25rem;
}
li {
	margin-bottom: 0.5rem;
	position: relative;
}
li strong {
	color: var(--brand);
	font-weight: 700;
}
.card {
	border: 1px solid var(--border);
	border-radius: .75rem;
	padding: 1.5rem;
	background: 
		linear-gradient(135deg, 
			color-mix(in srgb, var(--bg) 95%, var(--brand) 5%) 0%,
			color-mix(in srgb, var(--bg) 92%, var(--accent) 8%) 100%
		);
	box-shadow: 0 8px 25px var(--shadow);
	position: relative;
	overflow: hidden;
	transition: all 0.3s ease;
}
.card::before {
	content: '';
	position: absolute;
	top: 0;
	left: -100%;
	width: 100%;
	height: 100%;
	background: linear-gradient(90deg, transparent, rgba(255, 255, 255, 0.1), transparent);
	transition: left 0.6s ease;
}
.card:hover {
	transform: translateY(-2px);
	box-shadow: 0 12px 35px var(--shadow);
}
.card:hover::before {
	left: 100%;
}
.btn {
	display: inline-block;
	margin-top: .75rem;
	background: linear-gradient(135deg, var(--brand) 0%, var(--brand-dark) 100%);
	color: #fff;
	padding: .75rem 1.25rem;
	border-radius: .5rem;
	text-decoration: none;
	font-weight: 700;
	position: relative;
	overflow: hidden;
	transition: all 0.3s ease;
	box-shadow: 0 4px 15px rgba(14, 165, 233, 0.3);
}
.btn::before {
	content: '';
	position: absolute;
	top: 0;
	left: -100%;
	width: 100%;
	height: 100%;
	background: linear-gradient(90deg, transparent, rgba(255, 255, 255, 0.2), transparent);
	transition: left 0.5s ease;
}
.btn:hover, .btn:focus { 
	background: linear-gradient(135deg, var(--brand-dark) 0%, var(--brand) 100%);
	transform: translateY(-2px);
	box-shadow: 0 8px 25px rgba(14, 165, 233, 0.4);
}
.btn:hover::before, .btn:focus::before {
	left: 100%;
}
.back-to-top {
	position: fixed;
	bottom: 2rem;
	right: 2rem;
	width: 3rem;
	height: 3rem;
	background: rgba(14, 165, 233, 0.3);
	border-radius: 50%;
	display: flex;
	align-items: center;
	justify-content: center;
	text-decoration: none;
	transition: all 0.3s ease;
	opacity: 0;
	visibility: hidden;
	transform: translateY(20px);
	z-index: 1000;
	backdrop-filter: blur(8px);
	border: 1px solid rgba(255, 255, 255, 0.1);
}
.back-to-top.visible {
	opacity: 1;
	visibility: visible;
	transform: translateY(0);
}
.back-to-top:hover {
	background: rgba(14, 165, 233, 0.5);
	transform: translateY(-2px);
	box-shadow: 0 8px 20px rgba(14, 165, 233, 0.2);
}
.back-to-top::before {
	content: '↑';
	color: white;
	font-size: 1.25rem;
	font-weight: bold;
	line-height: 1;
}
@media (prefers-color-scheme: dark) {
	.back-to-top {
		background: rgba(56, 189, 248, 0.3);
		border: 1px solid rgba(255, 255, 255, 0.05);
	}
	.back-to-top:hover {
		background: rgba(56, 189, 248, 0.5);
		box-shadow: 0 8px 20px rgba(56, 189, 248, 0.2);
	}
}
footer { padding: 1.5rem 1rem; color: var(--muted); }