* {
	margin: 0;
	padding: 0;
	box-sizing: border-box;
}

body {
	font-family: "Segoe UI", Tahoma, Geneva, Verdana, sans-serif;
	background: linear-gradient(135deg, #667eea 0%, #764ba2 100%);
	min-height: 100vh;
	padding: 20px;
	display: flex;
	justify-content: center;
	align-items: center;
}

.container {
	max-width: 900px;
	width: 100%;
	padding: 40px;
	background: #fff;
	border-radius: 20px;
	box-shadow: 0 10px 40px rgba(0, 0, 0, 0.2);
}

h1 {
	text-align: center;
	color: #667eea;
	margin-bottom: 10px;
	font-size: 2.5em;
}

.subtitle {
	text-align: center;
	color: #666;
	margin-bottom: 30px;
	font-size: 1.2em;
}

/* Start Screen */
.start-screen {
	text-align: center;
	padding: 40px 20px;
}

.start-content {
	background: #f8f9ff;
	padding: 30px;
	border-radius: 15px;
	margin: 30px 0;
}

.start-content p {
	font-size: 1.3em;
	margin: 15px 0;
	color: #333;
}

.btn-start {
	background: linear-gradient(135deg, #667eea 0%, #764ba2 100%);
	color: white;
	font-size: 1.5em;
	padding: 18px 50px;
	border: none;
	border-radius: 50px;
	cursor: pointer;
	font-weight: bold;
	transition: all 0.3s;
	box-shadow: 0 5px 15px rgba(102, 126, 234, 0.4);
}

.btn-start:hover {
	transform: translateY(-3px);
	box-shadow: 0 8px 20px rgba(102, 126, 234, 0.6);
}

/* Quiz Screen */
.quiz-screen {
	animation: fadeIn 0.5s;
}

@keyframes fadeIn {
	from {
		opacity: 0;
	}
	to {
		opacity: 1;
	}
}

#scoreSection {
	text-align: right;
	margin-bottom: 20px;
	padding: 10px;
	background: #f0f4ff;
	border-radius: 10px;
	color: #667eea;
	font-weight: bold;
	font-size: 1.1em;
}

#currentQ {
	color: #764ba2;
}

#score {
	color: #34a853;
	font-size: 1.3em;
}

.operation-badge {
	text-align: center;
	padding: 8px 20px;
	margin: 15px auto;
	width: fit-content;
	border-radius: 20px;
	font-weight: bold;
	font-size: 1.1em;
}

.pizza-row {
	display: flex;
	justify-content: center;
	align-items: center;
	margin: 30px 0;
	flex-wrap: wrap;
	gap: 10px;
}

.pizza-container {
	display: flex;
	flex-direction: column;
	align-items: center;
}

.fraction-label {
	font-size: 1.3em;
	font-weight: bold;
	color: #333;
	margin-bottom: 8px;
	min-height: 25px;
}

.op {
	font-size: 2.5em;
	font-weight: bold;
	color: #667eea;
	margin: 0 15px;
}

canvas {
	background: #fffef7;
	border-radius: 50%;
	border: 3px solid #667eea;
	cursor: pointer;
	transition: transform 0.2s;
}

canvas:hover {
	transform: scale(1.05);
}

.instruction {
	text-align: center;
	color: #ff6b6b;
	font-weight: bold;
	margin: 20px 0;
	font-size: 1.1em;
	min-height: 30px;
}

/* Answer Section with Vertical Fraction */
.answer-section {
	display: flex;
	justify-content: center;
	align-items: center;
	gap: 20px;
	margin: 30px 0;
	flex-wrap: wrap;
}

.answer-label {
	font-weight: bold;
	color: #333;
	font-size: 1.2em;
}

.fraction-input {
	display: flex;
	flex-direction: column;
	align-items: center;
	gap: 5px;
}

.fraction-input input[type="number"] {
	width: 80px;
	padding: 10px;
	font-size: 1.3em;
	border: 2px solid #ddd;
	border-radius: 8px;
	text-align: center;
	transition: border-color 0.3s;
}

.fraction-input input[type="number"]:focus {
	outline: none;
	border-color: #667eea;
}

.fraction-line {
	width: 80px;
	height: 3px;
	background: #333;
	margin: 0;
}

button {
	padding: 10px 25px;
	font-size: 1.1em;
	border: none;
	border-radius: 10px;
	cursor: pointer;
	font-weight: bold;
	transition: all 0.3s;
}

.btn-check {
	background: #34a853;
	color: white;
	padding: 12px 30px;
	font-size: 1.2em;
}

.btn-check:hover {
	background: #2d9148;
	transform: translateY(-2px);
}

.btn-check:disabled {
	background: #ccc;
	cursor: not-allowed;
}

.button-row {
	display: flex;
	justify-content: center;
	gap: 15px;
	margin-top: 20px;
	flex-wrap: wrap;
}

.btn-hint {
	background: #ffa500;
	color: white;
}

.btn-hint:hover {
	background: #ff8c00;
	transform: translateY(-2px);
}

.btn-next {
	background: #667eea;
	color: white;
	font-size: 1.2em;
}

.btn-next:hover {
	background: #5568d3;
	transform: translateY(-2px);
}

.feedback {
	text-align: center;
	font-size: 1.3em;
	font-weight: bold;
	margin: 20px 0;
	min-height: 30px;
	padding: 10px;
	border-radius: 10px;
}

.feedback.correct {
	color: #34a853;
	background: #e6f4ea;
}

.feedback.incorrect {
	color: #ea4335;
	background: #fce8e6;
}

.final-score {
	text-align: center;
	padding: 40px;
	background: linear-gradient(135deg, #667eea 0%, #764ba2 100%);
	color: white;
	border-radius: 15px;
	margin-top: 30px;
}

.final-score h2 {
	color: white;
	margin-bottom: 20px;
	font-size: 2em;
}

.final-score p {
	font-size: 1.5em;
	margin-bottom: 25px;
}

#finalScoreValue {
	font-size: 1.5em;
	font-weight: bold;
	color: #ffd700;
}

.btn-restart {
	background: white;
	color: #667eea;
	font-size: 1.2em;
	padding: 12px 30px;
}

.btn-restart:hover {
	background: #f0f0f0;
	transform: scale(1.05);
}

@media (max-width: 600px) {
	.container {
		padding: 20px;
	}

	h1 {
		font-size: 1.8em;
	}

	.pizza-row {
		gap: 5px;
	}

	canvas {
		width: 100px !important;
		height: 100px !important;
	}

	.op {
		font-size: 1.5em;
		margin: 0 5px;
	}

	.fraction-input input[type="number"] {
		width: 60px;
		font-size: 1.1em;
	}

	.fraction-line {
		width: 60px;
	}
}