:root {
	--background-start: rgb(4, 8, 16);
	--background-end: rgb(10, 16, 28);
	--foreground: #f8fafc;
	--foreground-muted: #cbd5e1;
	--accent: #e2e8f0;
	--border-color: rgba(255, 255, 255, 0.08);
	--radius: 20px;
	--shadow-glow: 0 0 20px rgba(255, 255, 255, 0.1);
	--shadow-text: 0 2px 8px rgba(0, 0, 0, 0.3);
}

/* Reduced motion preferences */
@media (prefers-reduced-motion: reduce) {
	*,
	*::before,
	*::after {
		animation-duration: 0.01ms !important;
		animation-iteration-count: 1 !important;
		transition-duration: 0.01ms !important;
		scroll-behavior: auto !important;
	}
	
	.glow {
		filter: blur(15px) !important;
		opacity: 0.05 !important;
		transform: none !important;
	}
}

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

html,
body {
	height: 100%;
	margin: 0;
	padding: 0;
	font-family: "Inter", system-ui, -apple-system, sans-serif;
	font-feature-settings: "cv11", "ss01";
	font-optical-sizing: auto;
	color: var(--foreground);
	background: linear-gradient(
			135deg,
			var(--background-start) 0%,
			rgba(6, 10, 20, 1) 25%,
			rgba(8, 14, 24, 1) 50%,
			rgba(9, 15, 26, 1) 75%,
			var(--background-end) 100%
		),
		url("data:image/svg+xml,%3Csvg viewBox='0 0 512 512' xmlns='http://www.w3.org/2000/svg'%3E%3Cfilter id='noiseFilter'%3E%3CfeTurbulence type='fractalNoise' baseFrequency='1.8' numOctaves='4' stitchTiles='stitch'/%3E%3CfeColorMatrix values='0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 1 0'/%3E%3C/filter%3E%3Crect width='100%25' height='100%25' filter='url(%23noiseFilter)' opacity='0.12'/%3E%3C/svg%3E");
	background-blend-mode: overlay;
	background-attachment: fixed;
	display: flex;
	align-items: center;
	justify-content: center;
	height: 100dvh;
	width: 100dvw;
	position: relative;
	overflow: hidden;
	user-select: none;
	/* Performance optimizations */
	contain: layout style;
	will-change: scroll-position; /* Optimize scrolling */
	overscroll-behavior: contain; /* Prevent scroll chaining */
}
.card {
	border-radius: var(--radius);
	padding: 3.5rem 3rem;m;
	max-width: min(480px, 90dvw);
	text-align: center;
	position: relative;
	overflow: hidden;
	backdrop-filter: blur(40px) saturate(180%);
	background: rgba(255, 255, 255, 0.03);
	border: 1px solid var(--border-color);
	z-index: 1;
	/* Performance optimizations */
	contain: layout style paint;
	will-change: auto; /* Remove will-change when not needed */
}
.glow {
	position: absolute;
	filter: blur(25px);
	z-index: 0;
	pointer-events: none;
	width: var(--w, 800px);
	height: var(--h, 800px);
	top: var(--t, 0);
	left: var(--l, 0);
	background: var(--bg, rgba(255, 255, 255, 0.1));
	opacity: var(--o, 0.15);
	border-radius: 50%;
	will-change: transform;
	/* Performance optimizations */
	contain: layout style paint;
	transform: translate3d(0, 0, 0); /* Force hardware acceleration */
}

.error-code {
	font-size: clamp(3.5rem, 12vw, 6rem);
	font-weight: 800;
	color: var(--accent);
	margin-bottom: 1.5rem;
	z-index: 1;
	position: relative;
	text-shadow: var(--shadow-text);
	letter-spacing: -0.02em;
	line-height: 1;
}

.headline {
	font-size: clamp(1.5rem, 4.5vw, 2rem);
	font-weight: 600;
	margin-bottom: 1.25rem;
	z-index: 1;
	position: relative;
	color: var(--foreground);
	letter-spacing: -0.01em;
	line-height: 1.2;
}

.desc {
	color: var(--foreground-muted);
	font-size: clamp(1rem, 3vw, 1.125rem);
	z-index: 1;
	position: relative;
	line-height: 1.6;
	margin-bottom: 2rem;
}

#url {
	display: block;
	margin-top: 2rem;
	padding: 1rem;
	font-size: 0.875rem;
	color: var(--accent);
	word-break: break-all;
	font-weight: 500;
	background: rgba(255, 255, 255, 0.02);
	border: 1px solid var(--border-color);
	border-radius: 12px;
	font-family: "SF Mono", "Monaco", "Inconsolata", "Roboto Mono", monospace;
	letter-spacing: 0.02em;
}
.footer {
	position: fixed;
	bottom: 0;
	left: 0;
	width: 100vw;
	padding: 1.5rem 0;
	text-align: center;
	z-index: 10;
	background: linear-gradient(
			to top,
			rgba(4, 8, 16, 0.6) 0%,
			rgba(4, 8, 16, 0.4) 40%,
			rgba(4, 8, 16, 0.2) 70%,
			transparent 85%
		),
		url("data:image/svg+xml,%3Csvg viewBox='0 0 512 512' xmlns='http://www.w3.org/2000/svg'%3E%3Cfilter id='footerNoise'%3E%3CfeTurbulence type='fractalNoise' baseFrequency='1.6' numOctaves='3' stitchTiles='stitch'/%3E%3CfeColorMatrix values='0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 1 0'/%3E%3C/filter%3E%3Crect width='100%25' height='100%25' filter='url(%23footerNoise)' opacity='0.09'/%3E%3C/svg%3E");
	background-blend-mode: overlay;
	backdrop-filter: blur(10px);
	/* Performance optimization */
	contain: layout style;
}

.footer-link {
	color: var(--foreground-muted);
	text-decoration: none;
	display: inline-flex;
	align-items: center;
	gap: 0.6rem;
	transition: all 0.2s ease;
	font-size: 0.875rem;
	font-weight: 500;
	padding: 0.5rem 1rem;
	border-radius: 8px;
	min-height: 44px;
	min-width: 44px;
	justify-content: center;
}

.footer-link:hover,
.footer-link:focus-visible {
	color: var(--accent);
	background: rgba(255, 255, 255, 0.05);
	transform: translateY(-1px);
	outline: 2px solid var(--accent);
	outline-offset: 2px;
}

.github-logo {
	width: 1.1em;
	height: 1.1em;
	fill: currentColor;
	transition: transform 0.2s ease;
}

.footer-link:hover .github-logo {
	transform: scale(1.1);
}