:root {
	--vertical-spacing: 20px;
	--panel-radius: 8px;
	--panel-border: #ccc;
	--muted-text: #999;
	--accent: rebeccapurple;
	--accent-hover: blueviolet;
	--input-padding: 10px;
	--input-radius: 4px;
	--error-color: #ff0230;
}

body {
	font-family: Arial, sans-serif;
	margin: 0;
	padding: var(--vertical-spacing);
}

h1 {
	text-align: center;
}

.container {
	max-width: 600px;
	margin: 0 auto;
	padding: var(--vertical-spacing);
	box-sizing: content-box;
	border-radius: var(--panel-radius);
	box-shadow: 0 2px 10px rgba(0, 0, 0, 0.1);
}

input[type="text"],
input[type="number"] {
	width: 100%;
	max-width: 100%;
	padding: var(--input-padding);
	margin-top: var(--vertical-spacing);
	margin-bottom: var(--input-padding);
	border: 1px solid var(--panel-border);
	border-radius: calc(var(--panel-radius) * 0.5);
	box-sizing: border-box;
}

button {
	width: 100%;
	max-width: 100%;
}

button:hover {
	background-color: var(--accent-hover);
}

#generateBtn {
	margin-top: var(--input-padding);
	padding: var(--input-padding);
	background-color: var(--accent);
	color: white;
	border: none;
	border-radius: calc(var(--panel-radius) * 0.5);
	cursor: pointer;
}

#qrCodeOutput {
	border: 1px solid var(--panel-border);
	border-radius: var(--input-radius);
	padding: var(--vertical-spacing);
	margin: var(--vertical-spacing) 0;
}

#qrCodeOutput img,
#qrCodeOutput canvas {
	margin-bottom: var(--vertical-spacing);
	max-width: 100%;
	height: auto;
}

/* visual treatment for generated QR when inputs are "dirty" */
#qrCodeOutput.dirty {
	transition: filter 160ms ease, opacity 160ms ease;
}

#qrCodeOutput.dirty img,
#qrCodeOutput.dirty canvas {
	filter: grayscale(70%) contrast(0.9);
	opacity: 0.6;
	transition: filter 160ms ease, opacity 160ms ease;
	pointer-events: none;
}

.hidden {
	display: none;
}

.small-link {
	display: inline-block;
	margin-left: var(--input-padding);
	font-size: 0.9rem;
	text-decoration: underline;
	cursor: pointer;
}

.small-label {
	display: block;
	font-size: 0.9rem;
	margin-bottom: 6px;
	color: var(--muted-text);
}

.current-size-badge {
	font-size: 0.9rem;
	line-height: 1.5278;
	border: 1px solid var(--panel-border);
	padding: 2px 6px;
	border-radius: var(--input-radius);
	vertical-align: middle;
}

#advancedControls {
	margin-top: var(--input-padding);
	padding: var(--vertical-spacing);
	border-radius: var(--panel-radius);
	border: 1px solid var(--panel-border);
}

#qrSizeSlider {
	width: 100%;
	max-width: 320px;
	margin-top: 6px;
}

.hint {
	font-size: 0.85rem;
	color: var(--muted-text);
	margin-top: 6px;
}

.control-row {
	margin-top: 10px;
}

.reset-btn {
	background: transparent;
	border: 1px solid var(--panel-border);
	padding: 6px 10px;
	border-radius: 4px;
	cursor: pointer;
	color: var(--muted-text);
}

.reset-btn:hover {
	background: #f0f0f0;
}

.input-error {
	border-color: var(--error-color);
	box-shadow: 0 0 0 3px rgba(255, 2, 48, 0.08);
	outline: none;
}

.input-error-message {
	color: var(--error-color);
	font-size: 0.9rem;
	margin-top: 6px;
	margin-bottom: 6px;
}

/* ensure error message spacing when hidden */
.input-error-message.hidden {
	display: none;
}