:root {
	--vt-bg: #f6f7fb;
	--vt-panel: rgba(255, 255, 255, 0.78);
	--vt-panel-strong: rgba(255, 255, 255, 0.92);
	--vt-border: rgba(0, 0, 0, 0.12);
	--vt-border-strong: rgba(0, 0, 0, 0.16);
	--vt-text: rgba(0, 0, 0, 0.88);
	--vt-text-muted: rgba(0, 0, 0, 0.68);
	--vt-focus: rgba(0, 169, 224, 0.65);
	--vt-radius: 14px;
	--vt-shadow: 0 10px 30px rgba(0, 0, 0, 0.10);
}

* { box-sizing: border-box; }

html, body {
	height: 100%;
}

body {
	margin: 0;
	font-family: ui-sans-serif, system-ui, -apple-system, Segoe UI, Roboto, Helvetica, Arial, "Apple Color Emoji", "Segoe UI Emoji";
	background: radial-gradient(1100px 800px at 20% 10%, rgba(0, 169, 224, 0.15), transparent 60%),
		radial-gradient(900px 700px at 80% 20%, rgba(255, 185, 70, 0.18), transparent 60%),
		var(--vt-bg);
	color: var(--vt-text);
}

.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;
}

.app {
	min-height: 100%;
	padding: 16px;
}

.app__header {
	max-width: 1200px;
	margin: 0 auto 12px;
}

.title {
	margin: 0;
	font-size: 18px;
	font-weight: 820;
	letter-spacing: -0.02em;
}

.subtitle {
	margin: 4px 0 0;
	font-size: 12px;
	color: var(--vt-text-muted);
}

.layout {
	max-width: 1200px;
	margin: 0 auto;
	display: grid;
	gap: 12px;
	grid-template-columns: 1fr;
}

@media (min-width: 980px) {
	.layout {
		grid-template-columns: 320px 1fr 360px;
		align-items: start;
	}
}

.panel { min-width: 0; }

.card {
	background: var(--vt-panel-strong);
	border: 1px solid var(--vt-border);
	border-radius: var(--vt-radius);
	box-shadow: var(--vt-shadow);
	padding: 12px;
	margin-bottom: 12px;
}

.row-head {
	display: flex;
	align-items: baseline;
	justify-content: space-between;
	gap: 10px;
	margin-bottom: 10px;
}

.row-title {
	font-weight: 800;
	font-size: 13px;
}

.row-subtitle {
	font-size: 12px;
	color: var(--vt-text-muted);
}

.controls-row {
	display: grid;
	grid-template-columns: repeat(3, minmax(44px, 1fr));
	gap: 8px;
	margin-bottom: 10px;
}

.btn {
	height: 44px;
	appearance: none;
	border: 1px solid var(--vt-border-strong);
	border-radius: 12px;
	background: rgba(255, 255, 255, 0.94);
	color: #111;
	font-size: 13px;
	font-weight: 650;
	padding: 0 12px;
	cursor: pointer;
}

.btn:hover { background: rgba(255, 255, 255, 1); }
.btn:active { transform: translateY(1px); }

.btn:focus-visible {
	outline: 3px solid var(--vt-focus);
	outline-offset: 2px;
}

.btn[disabled] {
	opacity: 0.55;
	cursor: not-allowed;
}

.btn-primary {
	background: rgba(0, 169, 224, 0.14);
	border-color: rgba(0, 169, 224, 0.35);
}

.btn-danger {
	background: rgba(212, 45, 85, 0.10);
	border-color: rgba(212, 45, 85, 0.35);
}

.field { display: grid; gap: 6px; margin-bottom: 10px; }
.label { font-size: 12px; color: var(--vt-text-muted); }

.toggle-row {
	display: flex;
	flex-wrap: wrap;
	gap: 12px;
	align-items: center;
	margin: 0 0 10px;
}

.toggle {
	display: inline-flex;
	gap: 8px;
	align-items: center;
	font-size: 12px;
	color: var(--vt-text-muted);
}

.engine-params {
	padding: 10px;
	border-radius: 14px;
	border: 1px solid rgba(0, 0, 0, 0.10);
	background: rgba(255, 255, 255, 0.72);
	margin: 0 0 10px;
}

.engine-params:empty {
	display: none;
}

.input {
	height: 40px;
	border: 1px solid var(--vt-border);
	border-radius: 12px;
	padding: 0 10px;
	background: rgba(255, 255, 255, 0.92);
	font-size: 13px;
}

.slider-row {
	display: flex;
	align-items: center;
	gap: 10px;
}

.slider-row input[type=range] { width: 100%; }
.value { min-width: 44px; text-align: right; font-size: 12px; color: var(--vt-text-muted); }

.drop-zone {
	padding: 12px;
	border-radius: 16px;
	border: 1px dashed rgba(0, 0, 0, 0.25);
	background: rgba(255, 255, 255, 0.5);
	cursor: pointer;
	user-select: none;
	margin-bottom: 10px;
}

.drop-zone:focus-visible {
	outline: 3px solid var(--vt-focus);
	outline-offset: 3px;
}

.drop-zone.is-over {
	border-color: rgba(0, 169, 224, 0.75);
	background: rgba(0, 169, 224, 0.10);
}

.drop-title { font-weight: 820; font-size: 15px; }
.drop-subtitle { margin-top: 4px; font-size: 12px; color: var(--vt-text-muted); }

.hint { margin: 0 0 10px; font-size: 12px; color: var(--vt-text-muted); }

.status {
	padding: 10px 12px;
	border-radius: 12px;
	border: 1px solid rgba(0, 0, 0, 0.10);
	background: rgba(255, 255, 255, 0.78);
	color: rgba(0, 0, 0, 0.72);
	font-size: 12px;
}

.preview-stage {
	position: relative;
	border-radius: 16px;
	overflow: hidden;
	border: 1px solid rgba(0, 0, 0, 0.12);
	background:
		linear-gradient(45deg, rgba(0,0,0,0.06) 25%, transparent 25%, transparent 75%, rgba(0,0,0,0.06) 75%),
		linear-gradient(45deg, rgba(0,0,0,0.06) 25%, transparent 25%, transparent 75%, rgba(0,0,0,0.06) 75%);
	background-position: 0 0, 12px 12px;
	background-size: 24px 24px;
	min-height: 360px;
}

.canvas {
	display: block;
	width: 100%;
	height: auto;
}

.canvas--overlay {
	position: absolute;
	inset: 0;
	pointer-events: none;
}

.placeholder {
	position: absolute;
	inset: 0;
	display: grid;
	place-items: center;
	padding: 16px;
	text-align: center;
	color: rgba(0, 0, 0, 0.62);
	font-size: 13px;
}

.frame {
	border-radius: 16px;
	overflow: hidden;
	border: 1px solid rgba(0, 0, 0, 0.12);
	background: #fff;
	min-height: 240px;
}

.compare-controls {
	display: grid;
	grid-template-columns: 1fr;
	gap: 10px;
	margin-bottom: 10px;
}

@media (min-width: 980px) {
	.compare-controls {
		grid-template-columns: 1fr 1.2fr auto;
		align-items: end;
	}
}

.compare-zoom {
	display: flex;
	gap: 8px;
}

.compare-zoom .btn {
	height: 40px;
}

.compare-viewport {
	position: relative;
	border-radius: 16px;
	overflow: hidden;
	border: 1px solid rgba(0, 0, 0, 0.12);
	background:
		linear-gradient(45deg, rgba(0,0,0,0.06) 25%, transparent 25%, transparent 75%, rgba(0,0,0,0.06) 75%),
		linear-gradient(45deg, rgba(0,0,0,0.06) 25%, transparent 25%, transparent 75%, rgba(0,0,0,0.06) 75%);
	background-position: 0 0, 12px 12px;
	background-size: 24px 24px;
	min-height: 360px;
	touch-action: none;
	cursor: grab;
}

.compare-viewport.is-dragging {
	cursor: grabbing;
}

.compare-scene {
	position: absolute;
	left: 0;
	top: 0;
	transform-origin: 0 0;
	will-change: transform;
}

.compare-canvas {
	display: block;
	position: absolute;
	left: 0;
	top: 0;
}

.compare-svg {
	position: absolute;
	left: 0;
	top: 0;
	pointer-events: none;
}

.compare-svg svg {
	display: block;
	width: 100%;
	height: 100%;
}

.iframe {
	display: block;
	width: 100%;
	height: 280px;
	border: 0;
	object-fit: contain;
}

.textarea {
	width: 100%;
	border-radius: 12px;
	border: 1px solid rgba(0, 0, 0, 0.14);
	background: rgba(255, 255, 255, 0.9);
	padding: 10px;
	font-size: 12px;
	line-height: 1.35;
	font-family: ui-monospace, SFMono-Regular, Menlo, Monaco, Consolas, "Liberation Mono", "Courier New", monospace;
}

.timings {
	list-style: none;
	padding: 0;
	margin: 0 0 10px;
	display: grid;
	gap: 6px;
}

.timings li {
	display: flex;
	justify-content: space-between;
	gap: 10px;
	font-size: 12px;
	color: var(--vt-text-muted);
}

.metrics {
	list-style: none;
	padding: 0;
	margin: 0 0 10px;
	display: grid;
	gap: 6px;
}

.metrics li {
	display: flex;
	justify-content: space-between;
	gap: 10px;
	font-size: 12px;
	color: var(--vt-text-muted);
}

.palette {
	margin: 0 0 10px;
	padding: 10px;
	border-radius: 14px;
	border: 1px solid rgba(0, 0, 0, 0.10);
	background: rgba(255, 255, 255, 0.72);
	display: grid;
	gap: 8px;
}

.palette:empty { display: none; }

.palette-row {
	display: grid;
	grid-template-columns: 18px 1fr auto;
	align-items: center;
	gap: 10px;
	font-size: 12px;
	color: var(--vt-text-muted);
}

.swatch {
	width: 18px;
	height: 18px;
	border-radius: 6px;
	border: 1px solid rgba(0, 0, 0, 0.18);
	box-shadow: 0 1px 0 rgba(255, 255, 255, 0.6) inset;
}

.palette-row code {
	font-family: ui-monospace, SFMono-Regular, Menlo, Monaco, Consolas, "Liberation Mono", "Courier New", monospace;
	font-size: 11px;
	color: var(--vt-text);
}

.errors summary { cursor: pointer; font-size: 12px; color: var(--vt-text-muted); }
.error-text {
	margin: 10px 0 0;
	padding: 10px;
	border-radius: 12px;
	border: 1px solid rgba(212, 45, 85, 0.25);
	background: rgba(212, 45, 85, 0.06);
	font-size: 12px;
	overflow: auto;
	max-height: 260px;
}

kbd {
	font-family: ui-monospace, SFMono-Regular, Menlo, Monaco, Consolas, "Liberation Mono", "Courier New", monospace;
	font-size: 11px;
	padding: 1px 6px;
	border-radius: 8px;
	border: 1px solid rgba(0,0,0,0.18);
	background: rgba(255,255,255,0.8);
}