:root {
	color-scheme: light dark;
	--font-title: 'Fredoka', cursive, system-ui, sans-serif;
	--font-body: 'Outfit', -apple-system, BlinkMacSystemFont, 'Segoe UI', Roboto, sans-serif;

	/* Paleta viva safari / bio-reino */
	--bg: #0d1b14;
	--bg-card: #15291f;
	--bg-card-hover: #1c3629;
	--bg-elevated: #1e3a2c;
	--border: #284c39;
	--border-light: #37634c;
	--fg: #f2f7f4;
	--fg-muted: #9eb8a8;
	
	--green-primary: #10b981;
	--green-glow: rgba(16, 185, 129, 0.25);
	--vert-color: #0ea5e9;
	--vert-glow: rgba(14, 165, 233, 0.25);
	--invert-color: #f59e0b;
	--invert-glow: rgba(245, 158, 11, 0.25);
	--accent-coral: #f43f5e;
	--accent-gold: #fbbf24;
	--accent-purple: #a855f7;

	--radius-sm: 8px;
	--radius-md: 14px;
	--radius-lg: 20px;
	--radius-full: 9999px;
	
	--shadow-sm: 0 2px 8px rgba(0, 0, 0, 0.2);
	--shadow-md: 0 8px 24px rgba(0, 0, 0, 0.35);
	--shadow-lg: 0 16px 40px rgba(0, 0, 0, 0.5);

	--space: 1rem;
}

@media (prefers-color-scheme: light) {
	:root {
		--bg: #f3f8f4;
		--bg-card: #ffffff;
		--bg-card-hover: #f7faf8;
		--bg-elevated: #e6f3eb;
		--border: #d1e5d9;
		--border-light: #b5d8c3;
		--fg: #13241b;
		--fg-muted: #537061;
		
		--green-primary: #059669;
		--vert-color: #0284c7;
		--invert-color: #d97706;
		--shadow-sm: 0 2px 8px rgba(20, 45, 30, 0.06);
		--shadow-md: 0 8px 24px rgba(20, 45, 30, 0.1);
		--shadow-lg: 0 16px 36px rgba(20, 45, 30, 0.15);
	}
}

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

body {
	background-color: var(--bg);
	color: var(--fg);
	font-family: var(--font-body);
	line-height: 1.5;
	min-height: 100vh;
	background-image: 
		radial-gradient(circle at 10% 20%, rgba(16, 185, 129, 0.08) 0%, transparent 40%),
		radial-gradient(circle at 90% 80%, rgba(14, 165, 233, 0.08) 0%, transparent 45%);
	background-attachment: fixed;
	-webkit-font-smoothing: antialiased;
}

h1, h2, h3, h4, .font-fun {
	font-family: var(--font-title);
	font-weight: 700;
	letter-spacing: 0.01em;
}

/* Base layout */
.app-container {
	max-width: 1100px;
	margin: 0 auto;
	padding: 1rem;
	display: flex;
	flex-direction: column;
	gap: 1.5rem;
}

@media (min-width: 640px) {
	.app-container {
		padding: 1.5rem 2rem 3rem;
	}
}

/* Header & Gamification Bar */
.game-header {
	background: var(--bg-card);
	border: 1px solid var(--border);
	border-radius: var(--radius-lg);
	padding: 1.25rem;
	box-shadow: var(--shadow-md);
	display: flex;
	flex-direction: column;
	gap: 1rem;
	position: relative;
	overflow: hidden;
}

.game-header::before {
	content: '';
	position: absolute;
	top: 0;
	left: 0;
	right: 0;
	height: 4px;
	background: linear-gradient(90deg, #10b981, #0ea5e9, #f59e0b, #ec4899);
}

.header-top {
	display: flex;
	justify-content: space-between;
	align-items: center;
	flex-wrap: wrap;
	gap: 1rem;
}

.logo-section {
	display: flex;
	align-items: center;
	gap: 0.85rem;
}

.logo-badge {
	font-size: 2.2rem;
	background: var(--bg-elevated);
	border: 2px solid var(--border-light);
	border-radius: var(--radius-md);
	width: 56px;
	height: 56px;
	display: flex;
	align-items: center;
	justify-content: center;
	box-shadow: var(--shadow-sm);
	animation: bounce 2s infinite ease-in-out;
}

@keyframes bounce {
	0%, 100% { transform: translateY(0); }
	50% { transform: translateY(-4px); }
}

.title-wrap h1 {
	font-size: clamp(1.2rem, 3.5vw, 1.8rem);
	line-height: 1.15;
	color: var(--fg);
}

.title-wrap p {
	font-size: 0.875rem;
	color: var(--fg-muted);
}

/* Stats Pill Row */
.stats-bar {
	display: flex;
	align-items: center;
	gap: 0.6rem;
	flex-wrap: wrap;
}

.stat-pill {
	display: flex;
	align-items: center;
	gap: 0.45rem;
	padding: 0.4rem 0.8rem;
	border-radius: var(--radius-full);
	background: var(--bg-elevated);
	border: 1px solid var(--border);
	font-weight: 600;
	font-size: 0.875rem;
	box-shadow: var(--shadow-sm);
}

.stat-pill.coins {
	color: #fbbf24;
	border-color: rgba(251, 191, 36, 0.3);
}

.stat-pill.streak {
	color: #f97316;
	border-color: rgba(249, 115, 22, 0.3);
}

.stat-pill.level-pill {
	background: linear-gradient(135deg, rgba(16, 185, 129, 0.2), rgba(14, 165, 233, 0.2));
	border-color: var(--green-primary);
	color: var(--fg);
}

.sound-toggle-btn {
	background: var(--bg-elevated);
	border: 1px solid var(--border);
	border-radius: var(--radius-full);
	width: 38px;
	height: 38px;
	display: flex;
	align-items: center;
	justify-content: center;
	font-size: 1.1rem;
	cursor: pointer;
	color: var(--fg);
	transition: all 0.2s;
}

.sound-toggle-btn:hover {
	transform: scale(1.08);
	border-color: var(--border-light);
}

/* Level Progress Bar */
.xp-container {
	display: flex;
	flex-direction: column;
	gap: 0.35rem;
}

.xp-header {
	display: flex;
	justify-content: space-between;
	font-size: 0.8rem;
	font-weight: 600;
	color: var(--fg-muted);
}

.xp-track {
	width: 100%;
	height: 10px;
	background: var(--bg-elevated);
	border-radius: var(--radius-full);
	overflow: hidden;
	position: relative;
	border: 1px solid var(--border);
}

.xp-fill {
	height: 100%;
	background: linear-gradient(90deg, #10b981, #06b6d4);
	border-radius: var(--radius-full);
	transition: width 0.6s cubic-bezier(0.34, 1.56, 0.64, 1);
	box-shadow: 0 0 10px rgba(16, 185, 129, 0.5);
}

/* Nav Tabs */
.nav-tabs {
	display: flex;
	gap: 0.5rem;
	overflow-x: auto;
	padding-bottom: 0.25rem;
	scrollbar-width: none;
}

.nav-tabs::-webkit-scrollbar {
	display: none;
}

.nav-tab {
	flex: 1;
	min-width: 120px;
	display: flex;
	align-items: center;
	justify-content: center;
	gap: 0.5rem;
	padding: 0.75rem 1rem;
	background: var(--bg-card);
	border: 1px solid var(--border);
	border-radius: var(--radius-md);
	color: var(--fg-muted);
	font-family: var(--font-title);
	font-size: 0.95rem;
	cursor: pointer;
	transition: all 0.2s ease;
	white-space: nowrap;
}

.nav-tab:hover {
	background: var(--bg-card-hover);
	color: var(--fg);
	transform: translateY(-1px);
}

.nav-tab.active {
	background: var(--green-primary);
	border-color: var(--green-primary);
	color: #ffffff;
	box-shadow: 0 4px 14px var(--green-glow);
}

/* Mode Sub-selector */
.sub-nav {
	display: flex;
	gap: 0.5rem;
	flex-wrap: wrap;
	margin-bottom: 1rem;
}

.sub-btn {
	padding: 0.5rem 0.9rem;
	background: var(--bg-card);
	border: 1px solid var(--border);
	border-radius: var(--radius-full);
	font-size: 0.85rem;
	font-weight: 600;
	color: var(--fg-muted);
	cursor: pointer;
	transition: all 0.2s;
	display: flex;
	align-items: center;
	gap: 0.35rem;
}

.sub-btn:hover {
	border-color: var(--border-light);
	color: var(--fg);
}

.sub-btn.active {
	background: var(--bg-elevated);
	border-color: var(--vert-color);
	color: var(--vert-color);
	box-shadow: 0 0 10px var(--vert-glow);
}

/* Main Cards & Components */
.card-panel {
	background: var(--bg-card);
	border: 1px solid var(--border);
	border-radius: var(--radius-lg);
	padding: 1.5rem;
	box-shadow: var(--shadow-md);
}

/* Clasificador Relámpago */
.classifier-arena {
	display: flex;
	flex-direction: column;
	gap: 1.5rem;
	align-items: center;
	text-align: center;
}

.round-info {
	display: flex;
	justify-content: space-between;
	width: 100%;
	align-items: center;
}

.animal-playcard {
	background: var(--bg-elevated);
	border: 2px solid var(--border-light);
	border-radius: var(--radius-lg);
	padding: 2rem 1.5rem;
	width: 100%;
	max-width: 440px;
	display: flex;
	flex-direction: column;
	align-items: center;
	gap: 1rem;
	box-shadow: var(--shadow-lg);
	position: relative;
	transition: all 0.3s cubic-bezier(0.34, 1.56, 0.64, 1);
	animation: slideIn 0.35s ease-out;
}

@keyframes slideIn {
	from { opacity: 0; transform: scale(0.9) translateY(10px); }
	to { opacity: 1; transform: scale(1) translateY(0); }
}

.animal-emoji-hero {
	font-size: 4.8rem;
	filter: drop-shadow(0 8px 16px rgba(0,0,0,0.3));
	margin-bottom: -0.5rem;
}

.animal-name-hero {
	font-size: 1.6rem;
	font-family: var(--font-title);
	color: var(--fg);
}

.animal-hint-box {
	background: rgba(0, 0, 0, 0.2);
	border-radius: var(--radius-md);
	padding: 0.75rem 1rem;
	font-size: 0.9rem;
	color: var(--fg-muted);
	max-width: 360px;
	border: 1px dashed var(--border);
}

.choice-buttons-grid {
	display: grid;
	grid-template-columns: 1fr 1fr;
	gap: 1rem;
	width: 100%;
	max-width: 480px;
}

.classify-btn {
	padding: 1.2rem 1rem;
	border-radius: var(--radius-lg);
	font-family: var(--font-title);
	font-size: 1.15rem;
	font-weight: 700;
	cursor: pointer;
	display: flex;
	flex-direction: column;
	align-items: center;
	gap: 0.4rem;
	border: 2px solid transparent;
	transition: all 0.18s ease;
	box-shadow: var(--shadow-md);
}

.classify-btn.vertebrate {
	background: linear-gradient(135deg, #0284c7, #0369a1);
	color: #ffffff;
	border-color: #38bdf8;
}

.classify-btn.vertebrate:hover {
	transform: translateY(-3px) scale(1.02);
	box-shadow: 0 10px 20px rgba(14, 165, 233, 0.4);
}

.classify-btn.invertebrate {
	background: linear-gradient(135deg, #d97706, #b45309);
	color: #ffffff;
	border-color: #fcd34d;
}

.classify-btn.invertebrate:hover {
	transform: translateY(-3px) scale(1.02);
	box-shadow: 0 10px 20px rgba(245, 158, 11, 0.4);
}

.classify-btn:active {
	transform: translateY(1px) scale(0.98);
}

.classify-btn .icon {
	font-size: 1.7rem;
}

.classify-btn .desc {
	font-size: 0.75rem;
	font-weight: 400;
	opacity: 0.9;
	font-family: var(--font-body);
}

/* Feedback message */
.feedback-box {
	padding: 0.9rem 1.25rem;
	border-radius: var(--radius-md);
	font-weight: 600;
	display: flex;
	align-items: center;
	gap: 0.75rem;
	animation: popIn 0.3s cubic-bezier(0.175, 0.885, 0.32, 1.275);
	max-width: 480px;
	width: 100%;
}

@keyframes popIn {
	0% { transform: scale(0.85); opacity: 0; }
	100% { transform: scale(1); opacity: 1; }
}

.feedback-correct {
	background: rgba(16, 185, 129, 0.15);
	border: 1px solid var(--green-primary);
	color: #34d399;
}

.feedback-incorrect {
	background: rgba(244, 63, 94, 0.15);
	border: 1px solid var(--accent-coral);
	color: #fb7185;
}

/* Quiz & Detective Mode */
.quiz-container {
	display: flex;
	flex-direction: column;
	gap: 1.25rem;
}

.quiz-question-header {
	background: var(--bg-elevated);
	border: 1px solid var(--border);
	border-radius: var(--radius-md);
	padding: 1.25rem;
	display: flex;
	flex-direction: column;
	gap: 0.5rem;
}

.quiz-options {
	display: grid;
	grid-template-columns: 1fr;
	gap: 0.75rem;
}

@media (min-width: 640px) {
	.quiz-options {
		grid-template-columns: 1fr 1fr;
	}
}

.quiz-opt-btn {
	padding: 1rem 1.2rem;
	background: var(--bg-elevated);
	border: 2px solid var(--border);
	border-radius: var(--radius-md);
	color: var(--fg);
	font-size: 0.95rem;
	font-weight: 600;
	text-align: left;
	cursor: pointer;
	display: flex;
	align-items: center;
	gap: 0.75rem;
	transition: all 0.2s;
}

.quiz-opt-btn:hover:not(:disabled) {
	border-color: var(--green-primary);
	background: var(--bg-card-hover);
	transform: translateX(4px);
}

.quiz-opt-btn.selected-correct {
	background: rgba(16, 185, 129, 0.2);
	border-color: var(--green-primary);
	color: #34d399;
}

.quiz-opt-btn.selected-wrong {
	background: rgba(244, 63, 94, 0.2);
	border-color: var(--accent-coral);
	color: #fb7185;
}

/* Album / Bestiary Grid */
.bestiary-header {
	display: flex;
	justify-content: space-between;
	align-items: center;
	flex-wrap: wrap;
	gap: 1rem;
	margin-bottom: 1.25rem;
}

.filter-tags {
	display: flex;
	gap: 0.4rem;
	flex-wrap: wrap;
}

.filter-btn {
	padding: 0.35rem 0.75rem;
	border-radius: var(--radius-full);
	background: var(--bg-elevated);
	border: 1px solid var(--border);
	font-size: 0.8rem;
	font-weight: 600;
	color: var(--fg-muted);
	cursor: pointer;
	transition: all 0.15s;
}

.filter-btn.active {
	background: var(--vert-color);
	color: #fff;
	border-color: var(--vert-color);
}

.animal-grid {
	display: grid;
	grid-template-columns: repeat(auto-fill, minmax(min(145px, 100%), 1fr));
	gap: 0.85rem;
}

@media (min-width: 640px) {
	.animal-grid {
		grid-template-columns: repeat(auto-fill, minmax(170px, 1fr));
		gap: 1rem;
	}
}

.animal-card {
	background: var(--bg-elevated);
	border: 1px solid var(--border);
	border-radius: var(--radius-md);
	padding: 1rem 0.75rem;
	display: flex;
	flex-direction: column;
	align-items: center;
	text-align: center;
	gap: 0.4rem;
	cursor: pointer;
	transition: all 0.25s ease;
	position: relative;
	overflow: hidden;
}

.animal-card:hover {
	transform: translateY(-4px);
	border-color: var(--green-primary);
	box-shadow: 0 10px 20px rgba(0, 0, 0, 0.25);
}

.animal-card.locked {
	filter: grayscale(0.85) opacity(0.65);
	cursor: not-allowed;
}

.animal-card.locked:hover {
	transform: none;
	border-color: var(--border);
}

.animal-card .card-emoji {
	font-size: 2.75rem;
	margin: 0.25rem 0;
	transition: transform 0.2s;
}

.animal-card:hover .card-emoji {
	transform: scale(1.15);
}

.badge-type {
	font-size: 0.68rem;
	padding: 0.15rem 0.5rem;
	border-radius: var(--radius-full);
	font-weight: 700;
	text-transform: uppercase;
	letter-spacing: 0.04em;
}

.badge-type.vertebrado {
	background: rgba(14, 165, 233, 0.2);
	color: #38bdf8;
	border: 1px solid rgba(14, 165, 233, 0.4);
}

.badge-type.invertebrado {
	background: rgba(245, 158, 11, 0.2);
	color: #fbbf24;
	border: 1px solid rgba(245, 158, 11, 0.4);
}

/* Modal for Animal Detail */
.modal-backdrop {
	position: fixed;
	inset: 0;
	background: rgba(0, 0, 0, 0.75);
	backdrop-filter: blur(6px);
	display: flex;
	align-items: center;
	justify-content: center;
	padding: 1rem;
	z-index: 100;
	animation: fadeIn 0.2s ease-out;
}

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

.modal-content {
	background: var(--bg-card);
	border: 2px solid var(--border-light);
	border-radius: var(--radius-lg);
	max-width: 500px;
	width: 100%;
	padding: 1.75rem;
	box-shadow: var(--shadow-lg);
	position: relative;
	max-height: 90vh;
	overflow-y: auto;
}

.modal-close-btn {
	position: absolute;
	top: 1rem;
	right: 1rem;
	background: var(--bg-elevated);
	border: 1px solid var(--border);
	border-radius: 50%;
	width: 32px;
	height: 32px;
	display: flex;
	align-items: center;
	justify-content: center;
	cursor: pointer;
	color: var(--fg);
	font-size: 1.1rem;
}

/* Badges & Achievements */
.achievements-grid {
	display: grid;
	grid-template-columns: repeat(auto-fill, minmax(min(220px, 100%), 1fr));
	gap: 1rem;
}

.achievement-card {
	background: var(--bg-elevated);
	border: 1px solid var(--border);
	border-radius: var(--radius-md);
	padding: 1.1rem;
	display: flex;
	align-items: flex-start;
	gap: 0.9rem;
	transition: all 0.2s;
}

.achievement-card.unlocked {
	border-color: #fbbf24;
	background: linear-gradient(135deg, rgba(251, 191, 36, 0.08), transparent);
}

.achievement-icon {
	font-size: 2.2rem;
	flex-shrink: 0;
}

.achievement-card.locked-ach .achievement-icon {
	filter: grayscale(1);
	opacity: 0.5;
}

/* Anatomy Lab Comparison */
.anatomy-split {
	display: grid;
	grid-template-columns: 1fr;
	gap: 1.25rem;
}

@media (min-width: 768px) {
	.anatomy-split {
		grid-template-columns: 1fr 1fr;
	}
}

.anatomy-column {
	background: var(--bg-elevated);
	border-radius: var(--radius-lg);
	padding: 1.4rem;
	border: 2px solid var(--border);
	display: flex;
	flex-direction: column;
	gap: 1rem;
}

.anatomy-column.vertebrates {
	border-color: rgba(14, 165, 233, 0.4);
}

.anatomy-column.invertebrates {
	border-color: rgba(245, 158, 11, 0.4);
}

.group-pill-list {
	display: flex;
	flex-direction: column;
	gap: 0.6rem;
}

.group-item {
	background: var(--bg-card);
	border: 1px solid var(--border);
	border-radius: var(--radius-md);
	padding: 0.75rem 1rem;
	font-size: 0.88rem;
}

.group-item h4 {
	color: var(--fg);
	margin-bottom: 0.2rem;
	display: flex;
	align-items: center;
	gap: 0.4rem;
}

/* Level Up Fireworks / Confetti Canvas */
.level-up-banner {
	text-align: center;
	padding: 1.5rem;
	background: linear-gradient(135deg, #10b981, #0ea5e9);
	color: #ffffff;
	border-radius: var(--radius-lg);
	box-shadow: 0 10px 30px rgba(16, 185, 129, 0.4);
	animation: popIn 0.4s ease-out;
}

/* Action button general */
.btn-action {
	padding: 0.75rem 1.4rem;
	border-radius: var(--radius-md);
	font-family: var(--font-title);
	font-size: 1rem;
	font-weight: 700;
	cursor: pointer;
	border: none;
	display: inline-flex;
	align-items: center;
	justify-content: center;
	gap: 0.5rem;
	transition: all 0.2s ease;
}

.btn-primary {
	background: var(--green-primary);
	color: #fff;
	box-shadow: 0 4px 14px var(--green-glow);
}

.btn-primary:hover {
	filter: brightness(1.1);
	transform: translateY(-2px);
}

.btn-outline {
	background: transparent;
	border: 1px solid var(--border-light);
	color: var(--fg);
}

.btn-outline:hover {
	background: var(--bg-elevated);
}

/* Animations */
@keyframes pulseGlow {
	0%, 100% { box-shadow: 0 0 10px rgba(16, 185, 129, 0.3); }
	50% { box-shadow: 0 0 25px rgba(16, 185, 129, 0.7); }
}

.pulse {
	animation: pulseGlow 2s infinite;
}

.shake {
	animation: shakeAnim 0.3s;
}

@keyframes shakeAnim {
	0%, 100% { transform: translateX(0); }
	20%, 60% { transform: translateX(-6px); }
	40%, 80% { transform: translateX(6px); }
}