:root {
	--toolbar-h: 56px;
	--overlay-bg-dark: rgba(0, 0, 0, 0.45);
	--overlay-bg-light: rgba(255, 255, 255, 0.6);
}

html, body {
	height: 100%;
}

body {
	margin: 0;
}

/* Full-viewport grid area below the fixed toolbar */
.grid {
	position: fixed;
	left: 0;
	right: 0;
	bottom: 0;
	top: var(--toolbar-h);
	display: flex;
	align-items: stretch;
	justify-content: stretch;
	gap: 0;
}

.swatch {
	flex: 1 1 0;
	min-width: 140px;
	position: relative;
	display: flex;
	align-items: stretch;
	justify-content: stretch;
	transition: background-color 120ms ease-in-out;
}

/* Overlay control panel */
.swatch .controls {
	position: absolute;
	left: 0;
	right: 0;
	bottom: 0;
	padding: .5rem;
	display: grid;
	grid-template-columns: 1fr auto auto auto;
	gap: .5rem;
	align-items: center;
}

/* Light/Dark UI variants based on background contrast */
.swatch.ui-dark .controls {
	background: var(--overlay-bg-dark);
	color: #fff;
}
.swatch.ui-light .controls {
	background: var(--overlay-bg-light);
	color: #000;
}

/* Inputs/buttons integrate with contrast */
.swatch.ui-dark .form-control,
.swatch.ui-dark .form-control-color {
	background-color: rgba(0,0,0,0.35);
	color: #fff;
	border-color: rgba(255,255,255,0.4);
}
.swatch.ui-light .form-control,
.swatch.ui-light .form-control-color {
	background-color: rgba(255,255,255,0.85);
	color: #000;
	border-color: rgba(0,0,0,0.25);
}

.controls .formats {
	grid-column: 1 / -1;
	font-size: .8rem;
	opacity: .9;
	white-space: nowrap;
	text-overflow: ellipsis;
	overflow: hidden;
}

/* Invalid input feedback */
.form-control.is-invalid {
	border-color: #dc3545;
}

/* Make small controls touch-friendly */
.form-control, .form-control-color, .btn {
	min-height: 2.25rem;
}

/* Ensure color input looks tidy */
.form-control-color {
	padding: 0;
	width: 2.25rem;
	height: 2.25rem;
}

/* Small screens: stack controls if tight */
@media (max-width: 480px) {
	.swatch .controls {
		grid-template-columns: 1fr auto auto;
	}
}