body {
	font-family: Arial, sans-serif;
	padding: 20px;
	max-width: 600px;
	margin: 0 auto;
}

h1 {
	text-align: center;
	margin-bottom: 30px;
}

.card-checker {
	display: flex;
	flex-direction: column;
	gap: 15px;
}

.input-group {
	display: flex;
	gap: 10px;
	align-items: center;
}

#cardNumber {
	padding: 12px;
	border: 1px solid #ccc;
	border-radius: 4px;
	font-size: 18px;
	letter-spacing: 2px;
	width: 300px;
	text-align: center;
}

button {
	padding: 12px 24px;
	background: #007bff;
	color: white;
	border: none;
	border-radius: 4px;
	cursor: pointer;
	font-size: 16px;
}

.result {
	padding: 15px;
	border-radius: 4px;
	min-height: 20px;
	text-align: center;
	font-size: 16px;
}

.success {
	background: #d4edda;
	color: #155724;
	border: 1px solid #c3e6cb;
}

.error {
	background: #f8d7da;
	color: #721c24;
	border: 1px solid #f5c6cb;
}

.card-info {
	padding: 10px;
	background: #f8f9fa;
	border-radius: 4px;
	text-align: center;
	font-size: 14px;
	color: #666;
}