:root {
    --primary: #1B4332;
    --primary-light: #2D6A4F;
    --bg: #F5F0E6;
    --surface: #D8F3DC;
    --accent: #D4A017;
    --accent-hover: #B8860B;
    --secondary: #BC4749;
    --ink: #3E2723;
    --ink-light: #5D4037;
    --success: #52B788;
    --error: #E63946;
    --white: #FFFFFF;
    --shadow-sm: 0 2px 4px rgba(0,0,0,0.1);
    --shadow-md: 0 4px 12px rgba(0,0,0,0.15);
    --shadow-lg: 0 8px 24px rgba(0,0,0,0.2);
    --radius-sm: 8px;
    --radius-md: 16px;
    --radius-lg: 24px;
    --spacing-xs: 4px;
    --spacing-sm: 8px;
    --spacing-md: 16px;
    --spacing-lg: 24px;
    --spacing-xl: 32px;
    --spacing-2xl: 48px;
    --font-display: 'Fredoka One', cursive;
    --font-body: 'Nunito', sans-serif;
    --transition-fast: 150ms ease-out;
    --transition-medium: 300ms ease-out;
    --transition-slow: 400ms ease-out;
}

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

html {
    font-size: 16px;
    scroll-behavior: smooth;
}

body {
    font-family: var(--font-body);
    background-color: var(--bg);
    color: var(--ink);
    line-height: 1.6;
    min-height: 100vh;
    -webkit-font-smoothing: antialiased;
    -moz-osx-font-smoothing: grayscale;
}

.page-content {
    padding-top: 80px;
}

img {
    max-width: 100%;
    height: auto;
    display: block;
}

a {
    color: inherit;
    text-decoration: none;
}

button {
    font-family: var(--font-body);
    cursor: pointer;
    border: none;
    background: none;
}

ul, ol {
    list-style: none;
}

/* Typography */
h1, h2, h3, h4, h5, h6 {
    font-family: var(--font-display);
    font-weight: 400;
    line-height: 1.2;
    color: var(--primary);
    text-wrap: balance;
}

h1 {
    font-size: clamp(2rem, 5vw, 4rem);
    letter-spacing: -0.02em;
}

h2 {
    font-size: clamp(1.5rem, 3.5vw, 2.5rem);
}

h3 {
    font-size: clamp(1.25rem, 2.5vw, 1.75rem);
}

p {
    font-size: 1rem;
    max-width: 65ch;
    text-wrap: pretty;
}

/* Layout */
.container {
    width: 100%;
    max-width: 1200px;
    margin: 0 auto;
    padding: 0 var(--spacing-md);
}

.flex {
    display: flex;
}

.flex-col {
    flex-direction: column;
}

.items-center {
    align-items: center;
}

.justify-center {
    justify-content: center;
}

.gap-sm { gap: var(--spacing-sm); }
.gap-md { gap: var(--spacing-md); }
.gap-lg { gap: var(--spacing-lg); }

.grid {
    display: grid;
}

.grid-2 {
    grid-template-columns: repeat(auto-fit, minmax(280px, 1fr));
}

.grid-3 {
    grid-template-columns: repeat(auto-fit, minmax(250px, 1fr));
}

.grid-4 {
    grid-template-columns: repeat(auto-fit, minmax(200px, 1fr));
}

.text-center { text-align: center; }
.hidden { display: none !important; }

.sr-only {
    position: absolute;
    width: 1px;
    height: 1px;
    padding: 0;
    margin: -1px;
    overflow: hidden;
    clip: rect(0, 0, 0, 0);
    white-space: nowrap;
    border: 0;
}

/* Buttons */
.btn {
    display: inline-flex;
    align-items: center;
    justify-content: center;
    gap: var(--spacing-sm);
    padding: var(--spacing-md) var(--spacing-xl);
    font-family: var(--font-body);
    font-weight: 700;
    font-size: 1rem;
    border-radius: var(--radius-md);
    transition: all var(--transition-fast);
    min-height: 48px;
    min-width: 48px;
}

.btn-primary {
    background-color: var(--accent);
    color: var(--white);
    box-shadow: var(--shadow-sm);
}

.btn-primary:hover {
    background-color: var(--accent-hover);
    transform: translateY(-2px);
    box-shadow: var(--shadow-md);
}

.btn-primary:active {
    transform: scale(0.98);
}

.btn-secondary {
    background-color: var(--surface);
    color: var(--primary);
    border: 2px solid var(--primary);
}

.btn-secondary:hover {
    background-color: var(--primary);
    color: var(--white);
}

.btn-outline {
    background-color: transparent;
    color: var(--primary);
    border: 2px solid var(--primary);
}

.btn-outline:hover {
    background-color: var(--primary);
    color: var(--white);
}

.btn-large {
    padding: var(--spacing-lg) var(--spacing-2xl);
    font-size: 1.125rem;
    border-radius: var(--radius-lg);
}

.btn-icon {
    padding: var(--spacing-sm);
    border-radius: 50%;
}

/* Header */
.site-header {
    background-color: var(--primary);
    padding: var(--spacing-md) 0;
    position: sticky;
    top: 0;
    z-index: 100;
    box-shadow: var(--shadow-md);
}

.header-content {
    display: flex;
    align-items: center;
    justify-content: space-between;
    gap: var(--spacing-md);
}

.logo {
    display: flex;
    align-items: center;
    gap: var(--spacing-sm);
    color: var(--white);
}

.logo-icon {
    width: 32px;
    height: 32px;
}

.logo-text {
    font-family: var(--font-display);
    font-size: 1.5rem;
    color: var(--white);
}

.desktop-nav {
    display: flex;
    gap: var(--spacing-lg);
}

.nav-link {
    color: rgba(255, 255, 255, 0.8);
    font-weight: 600;
    padding: var(--spacing-sm) var(--spacing-md);
    border-radius: var(--radius-sm);
    transition: all var(--transition-fast);
}

.nav-link:hover,
.nav-link.active {
    color: var(--white);
    background-color: rgba(255, 255, 255, 0.15);
}

.sound-toggle {
    color: var(--white);
    background-color: rgba(255, 255, 255, 0.1);
    padding: var(--spacing-sm);
    border-radius: 50%;
    transition: all var(--transition-fast);
}

.sound-toggle:hover {
    background-color: rgba(255, 255, 255, 0.2);
}

/* Mobile nav */
.mobile-nav {
    position: fixed;
    bottom: 0;
    left: 0;
    right: 0;
    background-color: var(--white);
    display: flex;
    justify-content: space-around;
    padding: var(--spacing-sm) 0;
    box-shadow: 0 -2px 10px rgba(0,0,0,0.1);
    z-index: 100;
}

.mobile-nav-item {
    display: flex;
    flex-direction: column;
    align-items: center;
    gap: 2px;
    padding: var(--spacing-xs) var(--spacing-sm);
    color: var(--ink-light);
    font-size: 0.75rem;
    font-weight: 600;
    min-width: 48px;
    min-height: 48px;
    justify-content: center;
}

.mobile-nav-item.active {
    color: var(--primary);
}

.mobile-nav-item svg {
    stroke: currentColor;
}

/* Hero */
.hero {
    position: relative;
    min-height: 100vh;
    display: flex;
    align-items: center;
    justify-content: center;
    background: linear-gradient(135deg, var(--primary) 0%, var(--primary-light) 100%);
    overflow: hidden;
    padding: var(--spacing-2xl) 0;
}

.hero-bg {
    position: absolute;
    inset: 0;
    pointer-events: none;
}

.leaf {
    position: absolute;
    width: 40px;
    height: 40px;
    background: rgba(255, 255, 255, 0.1);
    border-radius: 0 50% 50% 50%;
    animation: float 6s ease-in-out infinite;
}

.leaf-1 { top: 10%; left: 10%; animation-delay: 0s; --r: 45deg; }
.leaf-2 { top: 20%; right: 15%; animation-delay: 1s; --r: 120deg; }
.leaf-3 { top: 60%; left: 20%; animation-delay: 2s; --r: 200deg; }
.leaf-4 { top: 40%; right: 10%; animation-delay: 3s; --r: 300deg; }
.leaf-5 { top: 80%; left: 50%; animation-delay: 4s; --r: 75deg; }
.leaf-6 { top: 30%; left: 70%; animation-delay: 2.5s; --r: 150deg; }
.leaf-7 { top: 70%; right: 30%; animation-delay: 1.5s; --r: 250deg; }

.hero-content {
    position: relative;
    z-index: 1;
    text-align: center;
    color: var(--white);
}

.hero-title {
    color: var(--white);
    margin-bottom: var(--spacing-md);
    animation: fadeInUp 0.8s ease-out;
}

.hero-subtitle {
    font-size: 1.25rem;
    margin-bottom: var(--spacing-xl);
    opacity: 0.9;
    animation: fadeInUp 0.8s ease-out 0.2s both;
}

.hero-cta {
    animation: fadeInUp 0.8s ease-out 0.4s both;
}

/* Categories */
.categories-section {
    padding: var(--spacing-2xl) 0;
}

.section-title {
    text-align: center;
    margin-bottom: var(--spacing-xl);
}

.categories-grid {
    display: grid;
    grid-template-columns: repeat(auto-fit, minmax(280px, 1fr));
    gap: var(--spacing-lg);
}

.category-card {
    background: var(--white);
    border-radius: var(--radius-lg);
    padding: var(--spacing-xl);
    text-align: center;
    box-shadow: var(--shadow-sm);
    transition: all var(--transition-medium);
}

.category-card:hover {
    transform: translateY(-8px);
    box-shadow: var(--shadow-lg);
}

.category-card.herbivore { border-top: 4px solid #52B788; }
.category-card.carnivore { border-top: 4px solid #BC4749; }
.category-card.others { border-top: 4px solid #4A90E2; }

.category-icon {
    margin-bottom: var(--spacing-md);
}

.category-card h3 {
    margin-bottom: var(--spacing-sm);
}

.category-card p {
    color: var(--ink-light);
    margin: 0 auto;
}

/* Facts */
.facts-section {
    padding: var(--spacing-2xl) 0;
    background-color: var(--surface);
}

.fact-card {
    background: var(--white);
    border-radius: var(--radius-lg);
    padding: var(--spacing-xl);
    box-shadow: var(--shadow-md);
    max-width: 600px;
    margin: 0 auto;
    text-align: center;
}

.fact-content {
    display: flex;
    align-items: center;
    gap: var(--spacing-md);
    justify-content: center;
    margin-bottom: var(--spacing-lg);
}

.fact-icon {
    flex-shrink: 0;
}

#factText {
    font-size: 1.125rem;
    font-weight: 600;
    text-align: left;
    margin: 0;
}

.fact-dots {
    display: flex;
    justify-content: center;
    gap: var(--spacing-sm);
}

.fact-dot {
    width: 10px;
    height: 10px;
    border-radius: 50%;
    background-color: var(--surface);
    transition: all var(--transition-fast);
    cursor: pointer;
}

.fact-dot.active {
    background-color: var(--accent);
    transform: scale(1.2);
}

/* Quiz CTA */
.quiz-cta-section {
    padding: var(--spacing-2xl) 0;
}

.quiz-cta-card {
    background: linear-gradient(135deg, var(--primary) 0%, var(--primary-light) 100%);
    border-radius: var(--radius-lg);
    padding: var(--spacing-2xl);
    text-align: center;
    color: var(--white);
}

.quiz-cta-card h2 {
    color: var(--white);
    margin-bottom: var(--spacing-md);
}

.quiz-cta-card p {
    margin-bottom: var(--spacing-xl);
    opacity: 0.9;
}

.pulse-btn {
    animation: pulse 2s ease-in-out infinite;
}

/* Catalog */
.page-title {
    text-align: center;
    margin-bottom: var(--spacing-xl);
}

.page-subtitle {
    text-align: center;
    color: var(--ink-light);
    margin-bottom: var(--spacing-xl);
}

.catalog-section {
    padding: var(--spacing-xl) 0 var(--spacing-2xl);
}

.filters {
    display: flex;
    flex-wrap: wrap;
    gap: var(--spacing-lg);
    margin-bottom: var(--spacing-xl);
    justify-content: center;
}

.filter-group {
    display: flex;
    flex-direction: column;
    gap: var(--spacing-sm);
    align-items: center;
}

.filter-label {
    font-weight: 600;
    color: var(--ink-light);
    font-size: 0.875rem;
}

.filter-buttons {
    display: flex;
    flex-wrap: wrap;
    gap: var(--spacing-sm);
    justify-content: center;
}

.filter-btn {
    display: inline-flex;
    align-items: center;
    gap: var(--spacing-xs);
    padding: var(--spacing-sm) var(--spacing-md);
    border-radius: var(--radius-md);
    background-color: var(--white);
    color: var(--ink);
    font-weight: 600;
    font-size: 0.875rem;
    border: 2px solid transparent;
    transition: all var(--transition-fast);
    min-height: 40px;
}

.filter-btn:hover {
    border-color: var(--primary);
    color: var(--primary);
}

.filter-btn.active {
    background-color: var(--primary);
    color: var(--white);
}

.catalog-grid {
    display: grid;
    grid-template-columns: repeat(auto-fill, minmax(280px, 1fr));
    gap: var(--spacing-lg);
}

.dino-card {
    background: var(--white);
    border-radius: var(--radius-lg);
    overflow: hidden;
    box-shadow: var(--shadow-sm);
    transition: all var(--transition-medium);
    cursor: pointer;
}

.dino-card:hover {
    transform: translateY(-6px);
    box-shadow: var(--shadow-lg);
}

.dino-card-image {
    width: 100%;
    height: 200px;
    background: linear-gradient(135deg, var(--surface) 0%, var(--bg) 100%);
    display: flex;
    align-items: center;
    justify-content: center;
    overflow: hidden;
    position: relative;
}

.dino-card-image img {
    width: 100%;
    height: 100%;
    object-fit: cover;
    transition: transform var(--transition-medium);
}

.dino-card:hover .dino-card-image img {
    transform: scale(1.05);
}

.dino-card-placeholder {
    font-size: 4rem;
    opacity: 0.3;
}

.dino-card-badge {
    position: absolute;
    top: var(--spacing-sm);
    right: var(--spacing-sm);
    padding: var(--spacing-xs) var(--spacing-sm);
    border-radius: var(--radius-sm);
    font-size: 0.75rem;
    font-weight: 700;
    color: var(--white);
    text-transform: uppercase;
}

.dino-card-content {
    padding: var(--spacing-md);
}

.dino-card-name {
    font-family: var(--font-display);
    font-size: 1.25rem;
    color: var(--primary);
    margin-bottom: var(--spacing-xs);
}

.dino-card-latin {
    font-size: 0.75rem;
    color: var(--ink-light);
    font-style: italic;
    margin-bottom: var(--spacing-sm);
}

.dino-card-meta {
    display: flex;
    gap: var(--spacing-sm);
    flex-wrap: wrap;
}

.dino-card-tag {
    padding: var(--spacing-xs) var(--spacing-sm);
    background-color: var(--surface);
    border-radius: var(--radius-sm);
    font-size: 0.75rem;
    font-weight: 600;
    color: var(--primary);
}

.catalog-empty {
    text-align: center;
    padding: var(--spacing-2xl);
    color: var(--ink-light);
}

/* Dino Detail */
.dino-detail-section {
    padding: var(--spacing-xl) 0;
}

.dino-not-found {
    text-align: center;
    padding: var(--spacing-2xl);
}

.dino-detail-layout {
    display: grid;
    grid-template-columns: 1fr 1fr;
    gap: var(--spacing-2xl);
    margin-bottom: var(--spacing-2xl);
}

.dino-detail-image {
    background: linear-gradient(135deg, var(--surface) 0%, var(--bg) 100%);
    border-radius: var(--radius-lg);
    overflow: hidden;
    display: flex;
    align-items: center;
    justify-content: center;
    min-height: 400px;
}

.dino-detail-image img {
    width: 100%;
    height: 100%;
    object-fit: contain;
    max-height: 400px;
}

.dino-detail-placeholder {
    font-size: 8rem;
    opacity: 0.3;
}

.dino-detail-category {
    display: inline-block;
    padding: var(--spacing-xs) var(--spacing-md);
    border-radius: var(--radius-sm);
    color: var(--white);
    font-weight: 700;
    font-size: 0.875rem;
    margin-bottom: var(--spacing-md);
}

.dino-detail-name {
    margin-bottom: var(--spacing-xs);
}

.dino-detail-latin {
    font-style: italic;
    color: var(--ink-light);
    margin-bottom: var(--spacing-lg);
}

.dino-detail-stats {
    display: grid;
    grid-template-columns: repeat(2, 1fr);
    gap: var(--spacing-md);
    margin-bottom: var(--spacing-lg);
}

.stat-item {
    background: var(--white);
    padding: var(--spacing-md);
    border-radius: var(--radius-md);
    box-shadow: var(--shadow-sm);
}

.stat-label {
    display: block;
    font-size: 0.75rem;
    color: var(--ink-light);
    text-transform: uppercase;
    letter-spacing: 0.05em;
    margin-bottom: var(--spacing-xs);
}

.stat-value {
    display: block;
    font-weight: 700;
    font-size: 1.125rem;
    color: var(--primary);
}

.dino-detail-description {
    font-size: 1.125rem;
    line-height: 1.7;
    margin-bottom: var(--spacing-lg);
}

/* Comparison */
.comparison-section {
    background: var(--white);
    border-radius: var(--radius-lg);
    padding: var(--spacing-2xl);
    margin-bottom: var(--spacing-2xl);
    box-shadow: var(--shadow-sm);
}

.comparison-section h2 {
    text-align: center;
    margin-bottom: var(--spacing-md);
}

.comparison-subtitle {
    text-align: center;
    color: var(--ink-light);
    margin-bottom: var(--spacing-md);
}

.comparison-mode-toggle {
    display: flex;
    justify-content: center;
    gap: var(--spacing-sm);
    margin-bottom: var(--spacing-lg);
}

.mode-btn {
    padding: var(--spacing-sm) var(--spacing-md);
    border-radius: var(--radius-md);
    background: var(--surface);
    color: var(--ink);
    font-family: var(--font-body);
    font-weight: 700;
    font-size: 0.875rem;
    border: 2px solid transparent;
    transition: all var(--transition-fast);
    min-height: 40px;
}

.mode-btn:hover {
    border-color: var(--primary);
}

.mode-btn.active {
    background: var(--primary);
    color: var(--white);
    border-color: var(--primary);
}

.comparison-slider {
    margin-bottom: var(--spacing-xl);
    max-width: 500px;
    margin-left: auto;
    margin-right: auto;
}

.comparison-slider input[type="range"] {
    width: 100%;
    -webkit-appearance: none;
    appearance: none;
    height: 8px;
    border-radius: 4px;
    background: var(--surface);
    outline: none;
}

.comparison-slider input[type="range"]::-webkit-slider-thumb {
    -webkit-appearance: none;
    appearance: none;
    width: 24px;
    height: 24px;
    border-radius: 50%;
    background: var(--accent);
    cursor: pointer;
    box-shadow: var(--shadow-sm);
}

.comparison-slider input[type="range"]::-moz-range-thumb {
    width: 24px;
    height: 24px;
    border-radius: 50%;
    background: var(--accent);
    cursor: pointer;
    border: none;
    box-shadow: var(--shadow-sm);
}

.comparison-labels {
    display: flex;
    justify-content: space-between;
    margin-top: var(--spacing-sm);
    font-size: 0.75rem;
    color: var(--ink-light);
}

.comparison-visual {
    display: flex;
    align-items: flex-end;
    justify-content: center;
    gap: var(--spacing-xl);
    margin-bottom: var(--spacing-lg);
    min-height: 250px;
}

.comparison-item {
    display: flex;
    flex-direction: column;
    align-items: center;
    gap: var(--spacing-sm);
}

.comparison-vs {
    font-family: var(--font-display);
    font-size: 1.5rem;
    color: var(--accent);
    align-self: center;
    margin-bottom: var(--spacing-xl);
}

.comparison-name {
    font-weight: 700;
    color: var(--primary);
}

.comparison-size {
    font-size: 0.875rem;
    color: var(--ink-light);
}

.comparison-fact {
    text-align: center;
    font-size: 1.125rem;
    font-weight: 600;
    color: var(--primary);
    padding: var(--spacing-md);
    background: var(--surface);
    border-radius: var(--radius-md);
}

/* Facts detail */
.facts-detail-section {
    margin-bottom: var(--spacing-2xl);
}

.facts-detail-section h2 {
    text-align: center;
    margin-bottom: var(--spacing-xl);
}

.facts-grid {
    display: grid;
    grid-template-columns: repeat(auto-fit, minmax(280px, 1fr));
    gap: var(--spacing-lg);
}

.fact-detail-card {
    background: var(--white);
    border-radius: var(--radius-lg);
    padding: var(--spacing-xl);
    box-shadow: var(--shadow-sm);
    display: flex;
    gap: var(--spacing-md);
    align-items: flex-start;
    transition: all var(--transition-medium);
}

.fact-detail-card:hover {
    transform: translateY(-4px);
    box-shadow: var(--shadow-md);
}

.fact-detail-icon {
    font-size: 1.5rem;
    flex-shrink: 0;
}

.fact-detail-card p {
    margin: 0;
    font-weight: 600;
}

.dino-navigation {
    display: flex;
    justify-content: space-between;
    gap: var(--spacing-md);
}

/* Timeline */
.timeline-section {
    padding: var(--spacing-xl) 0 var(--spacing-2xl);
}

.timeline-container {
    margin-top: var(--spacing-xl);
}

.timeline-track {
    position: relative;
    height: 80px;
    margin-bottom: var(--spacing-2xl);
    display: flex;
    align-items: center;
}

.timeline-track::before {
    content: '';
    position: absolute;
    left: 0;
    right: 0;
    top: 24px;
    height: 4px;
    background: var(--surface);
    border-radius: 2px;
    z-index: 0;
}

.timeline-progress {
    position: absolute;
    left: 0;
    top: 24px;
    height: 4px;
    background: var(--accent);
    border-radius: 2px;
    transition: width 0.6s ease-out;
    width: 25%;
    z-index: 1;
}

.timeline-points {
    position: relative;
    width: 100%;
    display: flex;
    justify-content: space-between;
    z-index: 2;
}

.timeline-point {
    display: flex;
    flex-direction: column;
    align-items: center;
    gap: var(--spacing-xs);
    background: none;
    cursor: pointer;
    padding: 0;
    min-width: 80px;
}

.point-marker {
    width: 24px;
    height: 24px;
    border-radius: 50%;
    background: var(--white);
    border: 3px solid var(--primary);
    transition: all var(--transition-medium);
    box-shadow: var(--shadow-sm);
    margin-bottom: var(--spacing-xs);
}

.timeline-point.active .point-marker {
    background: var(--primary);
    transform: scale(1.3);
    border-color: var(--primary);
}

.timeline-point:hover .point-marker {
    transform: scale(1.2);
    border-color: var(--accent);
}

.point-label {
    font-family: var(--font-display);
    font-size: 1rem;
    color: var(--primary);
    white-space: nowrap;
}

.point-period {
    font-size: 0.75rem;
    color: var(--ink-light);
    white-space: nowrap;
}

.timeline-content {
    transition: opacity 0.6s ease-out;
}

.era-info {
    background: var(--white);
    border-radius: var(--radius-lg);
    padding: var(--spacing-xl);
    margin-bottom: var(--spacing-xl);
    box-shadow: var(--shadow-sm);
    border-left: 4px solid var(--accent);
}

.era-landscape {
    font-weight: 600;
    color: var(--ink-light);
    margin-bottom: var(--spacing-sm);
}

.era-description {
    font-size: 1.125rem;
    line-height: 1.7;
}

.era-dinos {
    display: grid;
    grid-template-columns: repeat(auto-fill, minmax(200px, 1fr));
    gap: var(--spacing-md);
    margin-top: var(--spacing-lg);
}

.era-dino-card {
    background: var(--white);
    border-radius: var(--radius-md);
    padding: var(--spacing-md);
    box-shadow: var(--shadow-sm);
    text-align: center;
    transition: all var(--transition-medium);
}

.era-dino-card:hover {
    transform: translateY(-4px);
    box-shadow: var(--shadow-md);
}

.era-dino-image {
    height: 120px;
    background: linear-gradient(135deg, var(--surface) 0%, var(--bg) 100%);
    border-radius: var(--radius-sm);
    overflow: hidden;
    display: flex;
    align-items: center;
    justify-content: center;
    margin-bottom: var(--spacing-sm);
}

.era-dino-image img {
    width: 100%;
    height: 100%;
    object-fit: cover;
}

.era-dino-card h4 {
    font-size: 1rem;
    margin-bottom: var(--spacing-xs);
}

.era-dino-card p {
    font-size: 0.75rem;
    color: var(--ink-light);
    font-style: italic;
    margin: 0 auto;
}

.present-message {
    background: var(--surface);
    border-radius: var(--radius-lg);
    padding: var(--spacing-xl);
    text-align: center;
    font-size: 1.25rem;
    font-weight: 600;
}

/* Enhanced Timeline */
.era-detail-card {
    background: var(--white);
    border-radius: var(--radius-lg);
    padding: var(--spacing-xl);
    margin-bottom: var(--spacing-xl);
    box-shadow: var(--shadow-sm);
    border-left: 4px solid var(--accent);
}

.era-header {
    display: flex;
    align-items: center;
    gap: var(--spacing-md);
    margin-bottom: var(--spacing-lg);
    flex-wrap: wrap;
}

.era-period-badge {
    background: var(--surface);
    color: var(--primary);
    padding: var(--spacing-xs) var(--spacing-md);
    border-radius: var(--radius-md);
    font-weight: 700;
    font-size: 0.875rem;
}

.era-info-grid {
    display: grid;
    grid-template-columns: repeat(auto-fit, minmax(200px, 1fr));
    gap: var(--spacing-md);
    margin-bottom: var(--spacing-lg);
}

.era-info-item {
    background: var(--bg);
    padding: var(--spacing-md);
    border-radius: var(--radius-md);
}

.era-info-label {
    display: block;
    font-size: 0.75rem;
    color: var(--ink-light);
    text-transform: uppercase;
    letter-spacing: 0.05em;
    margin-bottom: var(--spacing-xs);
}

.era-info-value {
    display: block;
    font-weight: 700;
    color: var(--primary);
}

.era-description {
    font-size: 1.125rem;
    line-height: 1.7;
    margin-bottom: var(--spacing-md);
}

.era-life {
    font-size: 1rem;
    color: var(--ink-light);
    font-style: italic;
}

.era-dinos-section {
    margin-bottom: var(--spacing-xl);
}

.era-dinos-section h3 {
    margin-bottom: var(--spacing-lg);
}

.era-dinos-grid {
    display: grid;
    grid-template-columns: repeat(auto-fill, minmax(200px, 1fr));
    gap: var(--spacing-md);
}

.era-dino-img {
    height: 120px;
    background: linear-gradient(135deg, var(--surface) 0%, var(--bg) 100%);
    border-radius: var(--radius-sm);
    overflow: hidden;
    display: flex;
    align-items: center;
    justify-content: center;
    margin-bottom: var(--spacing-sm);
}

.era-dino-img img {
    width: 100%;
    height: 100%;
    object-fit: cover;
}

.era-dino-fallback {
    font-size: 3rem;
}

.era-dino-info h4 {
    font-size: 1rem;
    margin-bottom: var(--spacing-xs);
}

.era-dino-latin {
    font-size: 0.75rem;
    color: var(--ink-light);
    font-style: italic;
    margin-bottom: var(--spacing-sm);
}

.era-dino-tags {
    display: flex;
    gap: var(--spacing-xs);
    flex-wrap: wrap;
}

.era-dino-tag {
    padding: 2px 8px;
    background: var(--surface);
    border-radius: var(--radius-sm);
    font-size: 0.75rem;
    font-weight: 600;
    color: var(--primary);
}

.present-facts {
    background: var(--white);
    border-radius: var(--radius-lg);
    padding: var(--spacing-xl);
    box-shadow: var(--shadow-sm);
}

.present-facts h3 {
    margin-bottom: var(--spacing-lg);
}

.present-facts-grid {
    display: grid;
    grid-template-columns: repeat(auto-fit, minmax(250px, 1fr));
    gap: var(--spacing-md);
}

.present-fact-card {
    background: var(--surface);
    border-radius: var(--radius-md);
    padding: var(--spacing-lg);
    display: flex;
    gap: var(--spacing-md);
    align-items: flex-start;
}

.present-fact-icon {
    font-size: 2rem;
    flex-shrink: 0;
}

.present-fact-card p {
    margin: 0;
    font-weight: 600;
}

/* Map */
.map-section {
    padding: var(--spacing-xl) 0 var(--spacing-2xl);
}

.world-map {
    min-height: 500px;
    border-radius: var(--radius-lg);
    overflow: hidden;
    box-shadow: var(--shadow-md);
    margin-top: var(--spacing-lg);
}

.map-filters {
    display: flex;
    flex-wrap: wrap;
    gap: var(--spacing-sm);
    justify-content: center;
    margin-bottom: var(--spacing-lg);
}

.map-popup h3 {
    margin-bottom: var(--spacing-sm);
    font-size: 1.125rem;
}

.map-popup ul {
    margin-top: var(--spacing-sm);
}

.map-popup li {
    margin-bottom: var(--spacing-xs);
}

.map-popup a {
    color: var(--primary);
    text-decoration: underline;
}

/* Quiz */
.quiz-section {
    padding: var(--spacing-xl) 0 var(--spacing-2xl);
}

.quiz-progress {
    max-width: 600px;
    margin: 0 auto var(--spacing-xl);
    position: relative;
}

.progress-bar {
    height: 8px;
    background: var(--surface);
    border-radius: 4px;
    overflow: hidden;
}

.progress-bar::after {
    content: '';
    display: block;
    height: 100%;
    background: var(--accent);
    border-radius: 4px;
    transition: width 0.4s ease-out;
    width: 10%;
}

.progress-text {
    display: block;
    text-align: center;
    margin-top: var(--spacing-sm);
    font-weight: 600;
    color: var(--ink-light);
}

.question-card {
    background: var(--white);
    border-radius: var(--radius-lg);
    padding: var(--spacing-xl);
    box-shadow: var(--shadow-md);
    max-width: 600px;
    margin: 0 auto;
}

.question-text {
    margin-bottom: var(--spacing-xl);
    text-align: center;
}

.options-grid {
    display: grid;
    gap: var(--spacing-md);
    margin-bottom: var(--spacing-lg);
}

.option-btn {
    padding: var(--spacing-md) var(--spacing-lg);
    border-radius: var(--radius-md);
    border: 2px solid var(--surface);
    background: var(--white);
    font-family: var(--font-body);
    font-weight: 600;
    font-size: 1rem;
    text-align: left;
    display: flex;
    align-items: center;
    gap: var(--spacing-md);
    transition: all var(--transition-fast);
    min-height: 48px;
}

.option-btn:hover {
    border-color: var(--primary);
    background: var(--surface);
}

.option-btn.correct {
    background: var(--success);
    border-color: var(--success);
    color: var(--white);
}

.option-btn.incorrect {
    background: var(--error);
    border-color: var(--error);
    color: var(--white);
}

.option-letter {
    display: flex;
    align-items: center;
    justify-content: center;
    width: 36px;
    height: 36px;
    border-radius: 50%;
    background: var(--surface);
    font-weight: 700;
    flex-shrink: 0;
}

.question-fact {
    padding: var(--spacing-md);
    background: var(--surface);
    border-radius: var(--radius-md);
    margin-bottom: var(--spacing-lg);
    font-weight: 600;
}

/* Quiz Result */
.quiz-result {
    max-width: 600px;
    margin: 0 auto;
}

.result-card {
    background: var(--white);
    border-radius: var(--radius-lg);
    padding: var(--spacing-2xl);
    box-shadow: var(--shadow-lg);
    text-align: center;
}

.result-card h2 {
    margin-bottom: var(--spacing-lg);
}

.result-score {
    font-family: var(--font-display);
    font-size: 3rem;
    color: var(--accent);
    margin-bottom: var(--spacing-md);
}

.result-message {
    font-size: 1.125rem;
    margin-bottom: var(--spacing-xl);
    margin-left: auto;
    margin-right: auto;
}

.result-diploma {
    background: linear-gradient(135deg, var(--primary) 0%, var(--primary-light) 100%);
    border-radius: var(--radius-lg);
    padding: var(--spacing-xl);
    margin-bottom: var(--spacing-xl);
    color: var(--white);
    border: 3px solid var(--accent);
}

.result-diploma h3 {
    color: var(--white);
    margin-bottom: var(--spacing-md);
}

.result-diploma p {
    margin: 0 auto var(--spacing-sm);
    opacity: 0.9;
}

.result-actions {
    display: flex;
    gap: var(--spacing-md);
    justify-content: center;
    flex-wrap: wrap;
}

/* Facts page */
.facts-page-section {
    padding: var(--spacing-xl) 0 var(--spacing-2xl);
}

.facts-flip-grid {
    display: grid;
    grid-template-columns: repeat(auto-fill, minmax(280px, 1fr));
    gap: var(--spacing-lg);
}

.fact-flip-card {
    perspective: 1000px;
    cursor: pointer;
    min-height: 200px;
}

.fact-flip-inner {
    position: relative;
    width: 100%;
    height: 100%;
    min-height: 200px;
    transition: transform 0.4s ease-in-out;
    transform-style: preserve-3d;
}

.fact-flip-card.flipped .fact-flip-inner {
    transform: rotateY(180deg);
}

.fact-flip-front,
.fact-flip-back {
    position: absolute;
    inset: 0;
    backface-visibility: hidden;
    border-radius: var(--radius-lg);
    padding: var(--spacing-xl);
    display: flex;
    flex-direction: column;
    align-items: center;
    justify-content: center;
    text-align: center;
}

.fact-flip-front {
    background: var(--white);
    box-shadow: var(--shadow-sm);
}

.fact-flip-back {
    background: var(--primary);
    color: var(--white);
    transform: rotateY(180deg);
}

.fact-flip-front h3 {
    margin-bottom: var(--spacing-md);
    font-size: 1.125rem;
}

.fact-flip-front .question-mark {
    font-size: 3rem;
    color: var(--accent);
    margin-bottom: var(--spacing-md);
}

.fact-flip-back p {
    font-weight: 600;
    font-size: 1.125rem;
    margin: 0;
}

/* Animations keyframes */
@keyframes float {
    0%, 100% { transform: translateY(0) rotate(var(--r, 0deg)); }
    50% { transform: translateY(-20px) rotate(calc(var(--r, 0deg) + 10deg)); }
}

@keyframes pulse {
    0%, 100% { transform: scale(1); }
    50% { transform: scale(1.05); }
}

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

@keyframes shake {
    0%, 100% { transform: translateX(0); }
    25% { transform: translateX(-5px); }
    75% { transform: translateX(5px); }
}

/* Reduced motion */
@media (prefers-reduced-motion: reduce) {
    *, *::before, *::after {
        animation-duration: 0.01ms !important;
        animation-iteration-count: 1 !important;
        transition-duration: 0.01ms !important;
    }
    html {
        scroll-behavior: auto;
    }
}

/* Mobile adjustments */
@media (max-width: 768px) {
    body {
        padding-bottom: 70px;
    }
    .dino-detail-layout {
        grid-template-columns: 1fr;
    }
    .options-grid {
        grid-template-columns: 1fr;
    }
    .comparison-visual {
        flex-direction: column;
        align-items: center;
    }
    .comparison-vs {
        margin: var(--spacing-md) 0;
    }
    .dino-navigation {
        flex-direction: column;
    }
    .result-actions {
        flex-direction: column;
    }
    .result-actions .btn {
        width: 100%;
    }
    .desktop-nav {
        display: none;
    }
}

@media (min-width: 769px) {
    .mobile-nav {
        display: none;
    }
    .options-grid {
        grid-template-columns: repeat(2, 1fr);
    }
}

@media (min-width: 1024px) {
    .options-grid {
        grid-template-columns: 1fr;
    }
}