:root {
	--red-primary: #d52b1e;
	--red-dark: #b91c1c;
	--gold-accent: #fbbf24;
	--gold-light: #fde68a;
	--text-primary: #1f2937;
	--text-secondary: #6b7280;
	--bg-cream: #fefbf7;
	--bg-white: #ffffff;
	--border-light: #d1d5db;
	--border-accent: #fbbf24;
	--success-green: #10b981;
	--warning-orange: #f59e0b;
	--error-red: #ef4444;
	--shadow-soft: 0 2px 8px rgba(0, 0, 0, 0.08);
	--shadow-medium: 0 4px 16px rgba(0, 0, 0, 0.12);
	--radius-small: 8px;
	--radius-medium: 12px;
	--transition-smooth: all 0.3s cubic-bezier(0.4, 0, 0.2, 1);
}

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

body {
	font-family: 'Segoe UI', system-ui, -apple-system, sans-serif;
	background: linear-gradient(135deg, #faf8f3 0%, #f4f1ea 50%, #fefcf7 100%);
	color: var(--text-primary);
	line-height: 1.6;
	min-height: 100vh;
	display: flex;
	flex-direction: column;
	position: relative;
}

body::before {
	content: '';
	position: fixed;
	top: 0;
	left: 0;
	right: 0;
	height: 4px;
	background: linear-gradient(90deg, var(--red-primary) 0%, var(--gold-accent) 100%);
	z-index: 1000;
}

.container {
	max-width: 900px;
	margin: 0 auto;
	padding: 3rem 1.5rem;
	flex: 1;
}

.header {
	text-align: center;
	margin-bottom: 0;
	position: relative;
	background-image: url('images/bg-header.png');
	background-size: cover;
	background-position: center;
	background-repeat: no-repeat;
	padding: 4rem 2rem;
	width: 100vw;
	margin-left: calc(50% - 50vw);
	overflow: hidden;
}

.header::after {
	content: '';
	position: absolute;
	left: 0;
	right: 0;
	bottom: 0;
	height: 4px;
	background: linear-gradient(90deg, var(--red-primary), var(--gold-accent));
}

.header h1 {
	font-size: 2.75rem;
	font-weight: 700;
	background: linear-gradient(135deg, var(--red-primary) 0%, var(--red-dark) 100%);
	-webkit-background-clip: text;
	-webkit-text-fill-color: transparent;
	background-clip: text;
	margin-bottom: 0.75rem;
	letter-spacing: -0.025em;
	position: relative;
	z-index: 2;
	text-shadow: 0 2px 4px rgba(0, 0, 0, 0.3);
}

.header p {
	font-size: 1.125rem;
	color: var(--text-secondary);
}

.converter-card {
	background: var(--bg-white);
	border-radius: var(--radius-medium);
	box-shadow: var(--shadow-medium);
	padding: 2.5rem;
	margin-bottom: 2rem;
	border: 1px solid var(--border-light);
	position: relative;
	overflow: hidden;
}

.converter-card::before {
	content: '';
	position: absolute;
	top: 0;
	left: 0;
	right: 0;
	height: 6px;
	background: linear-gradient(90deg, var(--red-primary), var(--gold-accent));
}

.form-group {
	margin-bottom: 1.75rem;
}

.form-label {
	display: block;
	font-weight: 600;
	margin-bottom: 0.75rem;
	color: var(--text-primary);
	font-size: 1.05rem;
}

.form-select,
.form-input {
	width: 100%;
	padding: 1rem 1.25rem;
	border: 2px solid var(--border-light);
	border-radius: var(--radius-small);
	font-size: 1rem;
	transition: var(--transition-smooth);
	background: var(--bg-white);
	color: var(--text-primary);
}

.form-select:focus,
.form-input:focus {
	outline: none;
	border-color: var(--gold-accent);
	box-shadow: 0 0 0 3px rgba(251, 191, 36, 0.15);
}

.form-input:invalid {
	border-color: var(--error-red);
}

.convert-btn {
	width: 100%;
	padding: 1.25rem 2rem;
	background: linear-gradient(135deg, var(--red-primary) 0%, var(--red-dark) 100%);
	color: white;
	border: none;
	border-radius: var(--radius-small);
	font-size: 1.125rem;
	font-weight: 600;
	cursor: pointer;
	transition: var(--transition-smooth);
	margin-top: 1.5rem;
	text-transform: uppercase;
	letter-spacing: 0.5px;
	position: relative;
	overflow: hidden;
}

.convert-btn::before {
	content: '';
	position: absolute;
	top: 0;
	left: -100%;
	width: 100%;
	height: 100%;
	background: linear-gradient(90deg, transparent, rgba(255, 255, 255, 0.2), transparent);
	transition: left 0.5s;
}

.convert-btn:hover::before {
	left: 100%;
}

.convert-btn:hover {
	transform: translateY(-2px);
	box-shadow: var(--shadow-medium);
}

.convert-btn:disabled {
	background: var(--text-secondary);
	cursor: not-allowed;
	transform: none;
}

.convert-btn:disabled::before {
	display: none;
}

.result-card {
	background: linear-gradient(135deg, var(--bg-white) 0%, var(--gold-light) 100%);
	border: 2px solid var(--gold-accent);
	border-radius: var(--radius-medium);
	padding: 2rem;
	margin-top: 2rem;
	display: none;
	animation: slideInUp 0.4s cubic-bezier(0.4, 0, 0.2, 1);
	position: relative;
	overflow: hidden;
}

.result-card::before {
	content: '🎯';
	position: absolute;
	top: 1rem;
	right: 1rem;
	font-size: 1.5rem;
	opacity: 0.7;
}

.result-card.show {
	display: block;
}

.result-score {
	font-size: 3rem;
	font-weight: 800;
	color: var(--red-primary);
	text-align: center;
	margin-bottom: 0.5rem;
	text-shadow: 2px 2px 4px rgba(0, 0, 0, 0.1);
}

.result-percentile {
	font-size: 1.75rem;
	font-weight: 700;
	color: var(--gold-accent);
	text-align: center;
	margin-bottom: 0.5rem;
	margin-top: 1.5rem;
	text-shadow: 1px 1px 2px rgba(0, 0, 0, 0.1);
}

.result-text {
	text-align: center;
	color: var(--text-secondary);
	font-weight: 500;
}

.error-message {
	background: #fef2f2;
	border: 2px solid var(--error-red);
	color: var(--error-red);
	padding: 1.25rem;
	border-radius: var(--radius-small);
	margin-top: 1.5rem;
	display: none;
	position: relative;
}

.error-message::before {
	content: '⚠️';
	margin-right: 0.5rem;
}

.error-message.show {
	display: block;
	animation: slideInUp 0.3s ease-out;
}

.notice-message {
	background: #f0f9ff;
	border: 2px solid #0ea5e9;
	color: #0369a1;
	padding: 1.25rem;
	border-radius: var(--radius-small);
	margin-top: 1.5rem;
	display: none;
	position: relative;
}

.notice-message::before {
	content: 'ℹ️';
	margin-right: 0.5rem;
}

.notice-message.show {
	display: block;
	animation: slideInUp 0.3s ease-out;
}

.grid {
	display: grid;
	grid-template-columns: 1fr 1fr;
	gap: 1.5rem;
}

@media (max-width: 640px) {
	.grid {
		grid-template-columns: 1fr;
	}
	
	.header h1 {
		font-size: 2.25rem;
	}
	
	.converter-card {
		padding: 2rem 1.5rem;
	}
	
	.container {
		padding: 2rem 1rem;
	}
}

@keyframes slideInUp {
	from {
		opacity: 0;
		transform: translateY(20px);
	}
	to {
		opacity: 1;
		transform: translateY(0);
	}
}

.footer {
	text-align: center;
	padding: 2.5rem 2rem;
	color: var(--text-secondary);
	font-size: 0.9rem;
	background: linear-gradient(135deg, var(--bg-cream) 0%, rgba(251, 191, 36, 0.05) 100%);
	border-top: 1px solid var(--border-light);
}

.footer a {
	color: var(--red-primary);
	text-decoration: none;
	font-weight: 500;
	transition: var(--transition-smooth);
}

.footer a:hover {
	color: var(--red-dark);
	text-decoration: underline;
}

.info-section {
	background: var(--bg-white);
	border-radius: var(--radius-medium);
	box-shadow: var(--shadow-soft);
	padding: 2rem;
	margin-bottom: 1.5rem;
	border-left: 4px solid var(--gold-accent);
	position: relative;
}

.info-section::before {
	content: '📊';
	position: absolute;
	top: 1.5rem;
	right: 1.5rem;
	font-size: 1.25rem;
	opacity: 0.6;
}

.info-section h3 {
	margin-bottom: 1.25rem;
	font-size: 1.375rem;
	font-weight: 700;
}

.info-section p {
	color: var(--text-secondary);
	margin-bottom: 0.75rem;
	line-height: 1.7;
}

.info-section p strong {
	color: var(--red-primary);
	font-weight: 600;
}