:root {
	--bg: #0a0c0f;
	--card: rgba(255, 255, 255, 0.08);
	--card-hover: rgba(255, 255, 255, 0.12);
	--border: rgba(255, 255, 255, 0.15);
	--border-hover: rgba(255, 255, 255, 0.25);
	--text: #f1f5f9;
	--text-secondary: #cbd5e1;
	--muted: #94a3b8;
	--accent: #06b6d4;
	--accent-2: #8b5cf6;
	--accent-glow: rgba(6, 182, 212, 0.3);
	--ok: #10b981;
	--warning: #f59e0b;
	--error: #ef4444;
	--shadow: 0 20px 40px rgba(0,0,0,0.4);
	--shadow-lg: 0 25px 50px rgba(0,0,0,0.5);
	--glow: 0 0 20px rgba(6, 182, 212, 0.15);
}

@media (prefers-color-scheme: light) {
	:root {
		--bg: #f8fafc;
		--card: rgba(255, 255, 255, 0.9);
		--card-hover: rgba(255, 255, 255, 0.95);
		--border: rgba(0, 0, 0, 0.1);
		--border-hover: rgba(0, 0, 0, 0.15);
		--text: #0f172a;
		--text-secondary: #334155;
		--muted: #64748b;
		--accent: #0ea5e9;
		--accent-2: #7c3aed;
		--accent-glow: rgba(14, 165, 233, 0.2);
		--ok: #059669;
		--warning: #d97706;
		--error: #dc2626;
		--shadow: 0 20px 40px rgba(0,0,0,0.1);
		--shadow-lg: 0 25px 50px rgba(0,0,0,0.15);
		--glow: 0 0 20px rgba(14, 165, 233, 0.1);
	}
}

* { box-sizing: border-box; }

html, body {
	height: 100%;
}

body {
	margin: 0;
	font-family: Inter, ui-sans-serif, system-ui, -apple-system, Segoe UI, Roboto, Helvetica, Arial, "Apple Color Emoji", "Segoe UI Emoji";
	color: var(--text);
	background:
		radial-gradient(1400px 700px at 15% -15%, rgba(6,182,212,0.12), transparent 70%),
		radial-gradient(1000px 600px at 85% 10%, rgba(139,92,246,0.1), transparent 70%),
		radial-gradient(800px 400px at 50% 100%, rgba(16,185,129,0.08), transparent 60%),
		linear-gradient(180deg, rgba(255,255,255,0.02), rgba(255,255,255,0.005)),
		var(--bg);
	min-height: 100vh;
	transition: background 0.3s ease;
}

.app {
	max-width: 1200px;
	margin: 0 auto;
	padding: 32px 24px 48px;
}

.header {
	text-align: center;
	margin-bottom: 32px;
	position: relative;
}

.author-link {
	margin-bottom: 16px;
}

.author-link-text {
	font-size: 1.1rem;
	font-weight: 600;
	color: var(--accent);
	text-decoration: none;
	padding: 8px 16px;
	border-radius: 20px;
	background: rgba(6, 182, 212, 0.1);
	border: 1px solid rgba(6, 182, 212, 0.2);
	transition: all 0.2s ease;
	display: inline-block;
}

.author-link-text:hover {
	background: rgba(6, 182, 212, 0.15);
	border-color: rgba(6, 182, 212, 0.3);
	transform: translateY(-1px);
	box-shadow: 0 4px 12px rgba(6, 182, 212, 0.2);
}
.header::before {
	content: '';
	position: absolute;
	top: 50%;
	left: 50%;
	transform: translate(-50%, -50%);
	width: 200px;
	height: 200px;
	background: radial-gradient(circle, var(--accent-glow), transparent 70%);
	opacity: 0.3;
	z-index: -1;
	animation: pulse 4s ease-in-out infinite;
}
.header h1 {
	font-weight: 800;
	font-size: clamp(2rem, 5vw, 3.5rem);
	letter-spacing: -0.03em;
	margin: 0 0 12px 0;
	background: linear-gradient(135deg, var(--text), var(--accent));
	-webkit-background-clip: text;
	-webkit-text-fill-color: transparent;
	background-clip: text;
	text-shadow: 0 0 30px var(--accent-glow);
}
.subtitle {
	margin: 0 0 16px 0;
	color: var(--text-secondary);
	font-size: 1.125rem;
	font-weight: 500;
	max-width: 600px;
	margin-left: auto;
	margin-right: auto;
	line-height: 1.6;
}
.tip {
	margin: 0;
	color: var(--muted);
	font-size: 14px;
	background: var(--card);
	border: 1px solid var(--border);
	border-radius: 12px;
	padding: 12px 16px;
	display: inline-block;
	backdrop-filter: blur(8px);
}
.tip code {
	background: rgba(255,255,255,0.1);
	padding: 2px 6px;
	border-radius: 4px;
	font-family: 'SF Mono', Monaco, 'Cascadia Code', 'Roboto Mono', Consolas, 'Courier New', monospace;
	color: var(--accent);
	font-size: 13px;
}

@keyframes pulse {
	0%, 100% { opacity: 0.2; transform: translate(-50%, -50%) scale(0.8); }
	50% { opacity: 0.4; transform: translate(-50%, -50%) scale(1.2); }
}

.controls {
	display: grid;
	grid-template-columns: 240px 1fr auto;
	gap: 20px;
	align-items: end;
	background: var(--card);
	border: 1px solid var(--border);
	backdrop-filter: blur(12px);
	border-radius: 20px;
	padding: 24px;
	box-shadow: var(--shadow-lg);
	position: relative;
	overflow: hidden;
	transition: all 0.3s cubic-bezier(0.4, 0, 0.2, 1);
}
.controls::before {
	content: '';
	position: absolute;
	top: 0;
	left: 0;
	right: 0;
	height: 1px;
	background: linear-gradient(90deg, transparent, var(--accent), transparent);
	opacity: 0.5;
}
.controls:hover {
	background: var(--card-hover);
	border-color: var(--border-hover);
	transform: translateY(-2px);
	box-shadow: var(--shadow-lg), var(--glow);
}

.control-group {
	display: grid;
	grid-template-rows: auto auto;
	gap: 8px;
}
.control-group.stretch { align-self: stretch; }

label { 
	font-weight: 600; 
	font-size: 14px; 
	color: var(--text-secondary);
	text-transform: uppercase;
	letter-spacing: 0.05em;
	margin-bottom: 4px;
}

.number-input input {
	appearance: textfield;
	width: 100%;
	padding: 14px 16px;
	border-radius: 12px;
	border: 1px solid var(--border);
	background: rgba(0,0,0,0.1);
	color: var(--text);
	outline: none;
	font-size: 16px;
	font-weight: 600;
	transition: all 0.2s cubic-bezier(0.4, 0, 0.2, 1);
	backdrop-filter: blur(8px);
}
.number-input input:hover {
	border-color: var(--border-hover);
	background: rgba(0,0,0,0.12);
}
.number-input input:focus { 
	border-color: var(--accent); 
	box-shadow: 0 0 0 3px var(--accent-glow), 0 0 20px var(--accent-glow);
	transform: scale(1.02);
}
.number-input input::-webkit-outer-spin-button,
.number-input input::-webkit-inner-spin-button {
	-webkit-appearance: none;
	margin: 0;
}

#speedSlider {
	width: 100%;
	height: 8px;
	background: rgba(255,255,255,0.1);
	border-radius: 10px;
	outline: none;
	transition: all 0.2s ease;
	cursor: pointer;
}
#speedSlider::-webkit-slider-thumb {
	appearance: none;
	width: 24px;
	height: 24px;
	background: linear-gradient(135deg, var(--accent), var(--accent-2));
	border-radius: 50%;
	cursor: pointer;
	box-shadow: 0 4px 12px var(--accent-glow);
	transition: all 0.2s cubic-bezier(0.4, 0, 0.2, 1);
}
#speedSlider::-webkit-slider-thumb:hover {
	transform: scale(1.2);
	box-shadow: 0 6px 20px var(--accent-glow);
}
#speedSlider::-moz-range-thumb {
	width: 24px;
	height: 24px;
	background: linear-gradient(135deg, var(--accent), var(--accent-2));
	border-radius: 50%;
	cursor: pointer;
	border: none;
	box-shadow: 0 4px 12px var(--accent-glow);
	transition: all 0.2s cubic-bezier(0.4, 0, 0.2, 1);
}
#speedSlider::-moz-range-thumb:hover {
	transform: scale(1.2);
}

.buttons { display: flex; gap: 12px; justify-self: end; }

.btn {
	border: 1px solid var(--border);
	background: var(--card);
	color: var(--text);
	padding: 14px 20px;
	border-radius: 12px;
	font-weight: 600;
	font-size: 14px;
	cursor: pointer;
	transition: all 0.2s cubic-bezier(0.4, 0, 0.2, 1);
	backdrop-filter: blur(8px);
	position: relative;
	overflow: hidden;
	text-transform: uppercase;
	letter-spacing: 0.05em;
}
.btn::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 0.5s ease;
}
.btn:hover { 
	transform: translateY(-2px);
	background: var(--card-hover);
	border-color: var(--border-hover);
	box-shadow: 0 8px 25px rgba(0,0,0,0.2);
}
.btn:hover::before {
	left: 100%;
}
.btn:active { 
	transform: translateY(0px) scale(0.98); 
}
.btn.primary { 
	background: linear-gradient(135deg, var(--accent), var(--accent-2)); 
	color: white; 
	border-color: transparent;
	box-shadow: 0 4px 15px var(--accent-glow);
}
.btn.primary:hover {
	box-shadow: 0 8px 25px var(--accent-glow);
	transform: translateY(-2px) scale(1.02);
}
.btn.ghost { 
	background: transparent; 
	border-color: var(--border);
}
.btn.ghost:hover {
	background: var(--card);
	border-color: var(--accent);
}

.stats {
	display: grid;
	grid-template-columns: repeat(4, 1fr);
	gap: 16px;
	margin: 24px 0;
}

.stat {
	background: var(--card);
	border: 1px solid var(--border);
	backdrop-filter: blur(12px);
	border-radius: 16px;
	padding: 20px 18px;
	box-shadow: var(--shadow);
	display: grid;
	gap: 8px;
	position: relative;
	overflow: hidden;
	transition: all 0.3s cubic-bezier(0.4, 0, 0.2, 1);
}
.stat::before {
	content: '';
	position: absolute;
	top: 0;
	left: 0;
	right: 0;
	height: 2px;
	background: linear-gradient(90deg, var(--accent), var(--accent-2));
	opacity: 0;
	transition: opacity 0.3s ease;
}
.stat:hover {
	transform: translateY(-4px);
	background: var(--card-hover);
	border-color: var(--border-hover);
	box-shadow: var(--shadow-lg), var(--glow);
}
.stat:hover::before {
	opacity: 1;
}
.stat .label { 
	color: var(--muted); 
	font-weight: 600; 
	font-size: 12px; 
	text-transform: uppercase;
	letter-spacing: 0.1em;
}
.stat .value { 
	font-size: 32px; 
	font-weight: 800; 
	letter-spacing: -0.03em;
	background: linear-gradient(135deg, var(--text), var(--accent));
	-webkit-background-clip: text;
	-webkit-text-fill-color: transparent;
	background-clip: text;
	transition: all 0.3s ease;
}

.visualizer {
	height: 360px;
	background: linear-gradient(180deg, rgba(255,255,255,0.08), rgba(255,255,255,0.02));
	border: 1px solid var(--border);
	border-radius: 20px;
	box-shadow: var(--shadow-lg);
	overflow: hidden;
	position: relative;
	transition: all 0.3s cubic-bezier(0.4, 0, 0.2, 1);
}
.visualizer::before {
	content: '';
	position: absolute;
	top: 0;
	left: 0;
	right: 0;
	bottom: 0;
	background: 
		radial-gradient(circle at 20% 30%, var(--accent-glow), transparent 50%),
		radial-gradient(circle at 80% 70%, rgba(139,92,246,0.15), transparent 50%);
	opacity: 0.3;
	z-index: 1;
	pointer-events: none;
}
.visualizer:hover {
	transform: translateY(-2px);
	box-shadow: var(--shadow-lg), var(--glow);
	border-color: var(--border-hover);
}
#vizCanvas { 
	width: 100%; 
	height: 100%; 
	display: block; 
	position: relative;
	z-index: 2;
}

.footer { text-align: center; color: var(--muted); font-size: 13px; margin-top: 18px; }

/* Output panel */
.output {
	margin-top: 24px;
	background: var(--card);
	border: 1px solid var(--border);
	backdrop-filter: blur(12px);
	border-radius: 20px;
	box-shadow: var(--shadow-lg);
	transition: all 0.3s cubic-bezier(0.4, 0, 0.2, 1);
	overflow: hidden;
}
.output:hover {
	transform: translateY(-2px);
	box-shadow: var(--shadow-lg), var(--glow);
	border-color: var(--border-hover);
}
.output-header {
	display: flex;
	align-items: center;
	justify-content: space-between;
	padding: 16px 20px;
	border-bottom: 1px solid var(--border);
	background: rgba(255,255,255,0.02);
}
.output-header h2 { 
	margin: 0; 
	font-size: 18px; 
	font-weight: 700;
	color: var(--text-secondary);
	text-transform: uppercase;
	letter-spacing: 0.05em;
}
.output-actions { display: flex; gap: 10px; }
.output-body {
	max-height: 360px;
	min-height: 180px;
	padding: 20px;
	line-height: 1.7;
	font-size: 16px;
	color: var(--text);
	overflow: auto;
	position: relative;
	font-family: 'SF Mono', Monaco, 'Cascadia Code', 'Roboto Mono', Consolas, 'Courier New', monospace;
	background: rgba(0,0,0,0.1);
}
.output-body::-webkit-scrollbar {
	width: 8px;
}
.output-body::-webkit-scrollbar-track {
	background: rgba(255,255,255,0.05);
	border-radius: 4px;
}
.output-body::-webkit-scrollbar-thumb {
	background: var(--accent);
	border-radius: 4px;
}
.output-body::-webkit-scrollbar-thumb:hover {
	background: var(--accent-2);
}
#outputText { 
	white-space: pre-wrap; 
	word-wrap: break-word;
	color: var(--text-secondary);
}
.caret {
	position: absolute;
	width: 3px;
	height: 1.3em;
	background: linear-gradient(135deg, var(--accent), var(--accent-2));
	opacity: 0.8;
	border-radius: 2px;
	animation: blink 1.2s ease-in-out infinite;
	box-shadow: 0 0 10px var(--accent-glow);
}
@keyframes blink { 
	0%, 50% { opacity: 0.8; } 
	51%, 100% { opacity: 0.2; } 
}

/* Accessibility helpers */
.sr-only {
	position: absolute;
	width: 1px;
	height: 1px;
	padding: 0;
	margin: -1px;
	overflow: hidden;
	clip: rect(0,0,0,0);
	white-space: nowrap;
	border: 0;
}

/* Responsive */
@media (max-width: 1024px) {
	.app {
		padding: 24px 20px 36px;
	}
	.controls { 
		grid-template-columns: 1fr; 
		align-items: stretch; 
		gap: 16px;
	}
	.buttons { 
		justify-self: stretch;
		display: grid;
		grid-template-columns: 1fr 1fr;
	}
	.visualizer {
		height: 280px;
	}
}

@media (max-width: 768px) {
	.app {
		padding: 20px 16px 32px;
	}
	.header {
		margin-bottom: 24px;
	}
	.header h1 {
		font-size: clamp(1.75rem, 6vw, 2.5rem);
	}
	.subtitle {
		font-size: 1rem;
	}
	.controls {
		padding: 20px;
		border-radius: 16px;
	}
	.stats { 
		grid-template-columns: repeat(2, 1fr);
		gap: 12px;
		margin: 20px 0;
	}
	.stat {
		padding: 16px 14px;
	}
	.stat .value { 
		font-size: 24px; 
	}
	.visualizer {
		height: 240px;
		border-radius: 16px;
	}
	.output {
		margin-top: 20px;
		border-radius: 16px;
	}
	.output-body {
		max-height: 280px;
		min-height: 140px;
		padding: 16px;
		font-size: 14px;
	}
}

@media (max-width: 480px) {
	.app {
		padding: 16px 12px 24px;
	}
	.header {
		margin-bottom: 20px;
	}
	.controls {
		padding: 16px;
	}
	.stats {
		grid-template-columns: 1fr;
		gap: 10px;
	}
	.stat {
		padding: 14px 12px;
	}
	.stat .value {
		font-size: 20px;
	}
	.visualizer {
		height: 200px;
	}
	.btn {
		padding: 12px 16px;
		font-size: 13px;
	}
	.output-body {
		padding: 14px;
		font-size: 13px;
		line-height: 1.6;
	}
}