/* ============================================
   CHEMQUEST - CBSE Class 10 Chemistry
   Acids, Bases & Salts Interactive Learning Platform
   Modern Dark Theme with Glassmorphism
   ============================================ */

/* CSS Variables */
:root {
    /* Primary Colors - Blue, Green, Orange Palette */
    --color-primary: #3b82f6;
    --color-primary-light: #60a5fa;
    --color-primary-dark: #1d4ed8;
    
    --color-secondary: #10b981;
    --color-secondary-light: #34d399;
    --color-secondary-dark: #059669;
    
    --color-accent: #f97316;
    --color-accent-light: #fb923c;
    --color-accent-dark: #ea580c;
    
    /* Acid/Base/Salt Colors */
    --color-acid: #ef4444;
    --color-acid-light: #f87171;
    --color-base: #3b82f6;
    --color-base-light: #60a5fa;
    --color-salt: #a855f7;
    --color-salt-light: #c084fc;
    
    /* Dark Theme Colors */
    --bg-primary: #0f172a;
    --bg-secondary: #1e293b;
    --bg-tertiary: #334155;
    --bg-card: rgba(30, 41, 59, 0.7);
    
    /* Text Colors */
    --text-primary: #f8fafc;
    --text-secondary: #cbd5e1;
    --text-muted: #94a3b8;
    
    /* Glassmorphism */
    --glass-bg: rgba(30, 41, 59, 0.6);
    --glass-border: rgba(255, 255, 255, 0.1);
    --glass-shadow: 0 8px 32px rgba(0, 0, 0, 0.3);
    
    /* Gradients */
    --gradient-primary: linear-gradient(135deg, #3b82f6 0%, #10b981 100%);
    --gradient-accent: linear-gradient(135deg, #f97316 0%, #fbbf24 100%);
    --gradient-acid: linear-gradient(135deg, #ef4444 0%, #f97316 100%);
    --gradient-base: linear-gradient(135deg, #3b82f6 0%, #06b6d4 100%);
    --gradient-salt: linear-gradient(135deg, #a855f7 0%, #ec4899 100%);
    
    /* Spacing */
    --space-xs: 0.25rem;
    --space-sm: 0.5rem;
    --space-md: 1rem;
    --space-lg: 1.5rem;
    --space-xl: 2rem;
    --space-2xl: 3rem;
    
    /* Border Radius */
    --radius-sm: 0.375rem;
    --radius-md: 0.75rem;
    --radius-lg: 1rem;
    --radius-xl: 1.5rem;
    --radius-full: 9999px;
    
    /* Transitions */
    --transition-fast: 0.15s ease;
    --transition-normal: 0.3s ease;
    --transition-slow: 0.5s ease;
    
    /* Typography */
    --font-display: 'Outfit', sans-serif;
    --font-body: 'Space Grotesk', sans-serif;
}

/* Light Theme Variables */
[data-theme="light"] {
    --bg-primary: #f8fafc;
    --bg-secondary: #f1f5f9;
    --bg-tertiary: #e2e8f0;
    --bg-card: rgba(255, 255, 255, 0.8);
    
    --text-primary: #0f172a;
    --text-secondary: #334155;
    --text-muted: #64748b;
    
    --glass-bg: rgba(255, 255, 255, 0.7);
    --glass-border: rgba(0, 0, 0, 0.1);
    --glass-shadow: 0 8px 32px rgba(0, 0, 0, 0.1);
}

/* Reset & Base */
*, *::before, *::after {
    margin: 0;
    padding: 0;
    box-sizing: border-box;
}

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

body {
    font-family: var(--font-body);
    background: var(--bg-primary);
    color: var(--text-primary);
    line-height: 1.6;
    min-height: 100vh;
    overflow-x: hidden;
}

/* Typography */
h1, h2, h3, h4, h5, h6 {
    font-family: var(--font-display);
    font-weight: 700;
    line-height: 1.2;
}

/* Glassmorphism Utility */
.glass {
    background: var(--glass-bg);
    backdrop-filter: blur(12px);
    -webkit-backdrop-filter: blur(12px);
    border: 1px solid var(--glass-border);
    border-radius: var(--radius-lg);
    box-shadow: var(--glass-shadow);
}

/* Loading Screen */
.loading-screen {
    position: fixed;
    top: 0;
    left: 0;
    width: 100%;
    height: 100%;
    background: var(--bg-primary);
    display: flex;
    align-items: center;
    justify-content: center;
    z-index: 10000;
    transition: opacity 0.5s ease, visibility 0.5s ease;
}

.loading-screen.hidden {
    opacity: 0;
    visibility: hidden;
}

.loading-content {
    text-align: center;
}

.chemistry-loader {
    width: 150px;
    height: 150px;
    margin: 0 auto var(--space-lg);
    position: relative;
}

.atom {
    width: 100%;
    height: 100%;
    position: relative;
    animation: rotate 10s linear infinite;
}

.nucleus {
    position: absolute;
    top: 50%;
    left: 50%;
    transform: translate(-50%, -50%);
    width: 30px;
    height: 30px;
    background: var(--gradient-primary);
    border-radius: 50%;
    box-shadow: 0 0 20px var(--color-primary);
}

.orbit {
    position: absolute;
    top: 50%;
    left: 50%;
    border: 2px solid rgba(59, 130, 246, 0.3);
    border-radius: 50%;
    transform: translate(-50%, -50%);
}

.orbit-1 {
    width: 80px;
    height: 80px;
    animation: rotate 3s linear infinite reverse;
}

.orbit-2 {
    width: 110px;
    height: 110px;
    animation: rotate 4s linear infinite;
}

.orbit-3 {
    width: 140px;
    height: 140px;
    animation: rotate 5s linear infinite reverse;
}

.electron {
    position: absolute;
    width: 12px;
    height: 12px;
    background: var(--color-accent);
    border-radius: 50%;
    box-shadow: 0 0 10px var(--color-accent);
}

.electron-1 {
    top: 10%;
    left: 50%;
    transform: translateX(-50%);
    animation: orbit1 3s linear infinite;
}

.electron-2 {
    top: 50%;
    right: 5%;
    transform: translateY(-50%);
    animation: orbit2 4s linear infinite;
}

.electron-3 {
    bottom: 10%;
    left: 50%;
    transform: translateX(-50%);
    animation: orbit3 5s linear infinite;
}

@keyframes rotate {
    from { transform: translate(-50%, -50%) rotate(0deg); }
    to { transform: translate(-50%, -50%) rotate(360deg); }
}

@keyframes orbit1 {
    0% { transform: translateX(-50%) rotate(0deg) translateX(40px) rotate(0deg); }
    100% { transform: translateX(-50%) rotate(360deg) translateX(40px) rotate(-360deg); }
}

@keyframes orbit2 {
    0% { transform: translateY(-50%) rotate(0deg) translateX(55px) rotate(0deg); }
    100% { transform: translateY(-50%) rotate(360deg) translateX(55px) rotate(-360deg); }
}

@keyframes orbit3 {
    0% { transform: translateX(-50%) rotate(0deg) translateX(70px) rotate(0deg); }
    100% { transform: translateX(-50%) rotate(360deg) translateX(70px) rotate(-360deg); }
}

.loading-text {
    font-size: 1.5rem;
    font-weight: 600;
    margin-bottom: var(--space-md);
    background: var(--gradient-primary);
    -webkit-background-clip: text;
    -webkit-text-fill-color: transparent;
    background-clip: text;
}

.loading-bar {
    width: 200px;
    height: 6px;
    background: var(--bg-tertiary);
    border-radius: var(--radius-full);
    overflow: hidden;
    margin: 0 auto;
}

.loading-progress {
    height: 100%;
    background: var(--gradient-primary);
    border-radius: var(--radius-full);
    width: 0%;
    animation: loading 2s ease-in-out forwards;
}

@keyframes loading {
    0% { width: 0%; }
    100% { width: 100%; }
}

/* Navigation */
.main-nav {
    position: fixed;
    top: 0;
    left: 0;
    right: 0;
    height: 70px;
    background: var(--glass-bg);
    backdrop-filter: blur(12px);
    -webkit-backdrop-filter: blur(12px);
    border-bottom: 1px solid var(--glass-border);
    display: flex;
    align-items: center;
    justify-content: space-between;
    padding: 0 var(--space-xl);
    z-index: 1000;
    transition: var(--transition-normal);
}

.nav-brand .logo {
    display: flex;
    align-items: center;
    gap: var(--space-sm);
    font-family: var(--font-display);
    font-size: 1.5rem;
    font-weight: 700;
    color: var(--text-primary);
}

.nav-brand .logo i {
    color: var(--color-primary);
    font-size: 1.75rem;
}

.nav-center {
    display: flex;
    align-items: center;
    gap: var(--space-lg);
}

.level-badge {
    display: flex;
    align-items: center;
    gap: var(--space-xs);
    background: var(--gradient-accent);
    padding: var(--space-xs) var(--space-md);
    border-radius: var(--radius-full);
    font-weight: 600;
    font-size: 0.875rem;
}

.xp-bar {
    position: relative;
    width: 150px;
    height: 8px;
    background: var(--bg-tertiary);
    border-radius: var(--radius-full);
    overflow: hidden;
}

.xp-fill {
    height: 100%;
    background: var(--gradient-primary);
    border-radius: var(--radius-full);
    width: 0%;
    transition: width var(--transition-slow);
}

.xp-text {
    position: absolute;
    top: 50%;
    left: 50%;
    transform: translate(-50%, -50%);
    font-size: 0.625rem;
    font-weight: 600;
    color: var(--text-primary);
    text-shadow: 0 1px 2px rgba(0, 0, 0, 0.5);
}

.nav-actions {
    display: flex;
    align-items: center;
    gap: var(--space-sm);
}

.nav-btn {
    width: 40px;
    height: 40px;
    border-radius: var(--radius-md);
    border: 1px solid var(--glass-border);
    background: var(--glass-bg);
    color: var(--text-secondary);
    cursor: pointer;
    transition: var(--transition-fast);
    display: flex;
    align-items: center;
    justify-content: center;
}

.nav-btn:hover {
    background: var(--color-primary);
    color: white;
    transform: translateY(-2px);
}

/* Mobile Menu */
.mobile-menu {
    position: fixed;
    top: 0;
    right: -100%;
    width: 300px;
    height: 100vh;
    background: var(--bg-secondary);
    z-index: 1001;
    transition: right var(--transition-normal);
    overflow-y: auto;
}

.mobile-menu.open {
    right: 0;
}

.menu-header {
    display: flex;
    align-items: center;
    justify-content: space-between;
    padding: var(--space-lg);
    border-bottom: 1px solid var(--glass-border);
}

.menu-header h3 {
    font-size: 1.25rem;
}

.close-menu {
    width: 36px;
    height: 36px;
    border-radius: var(--radius-md);
    border: none;
    background: var(--bg-tertiary);
    color: var(--text-primary);
    cursor: pointer;
    transition: var(--transition-fast);
}

.close-menu:hover {
    background: var(--color-accent);
}

.menu-links {
    padding: var(--space-md);
}

.menu-link {
    display: flex;
    align-items: center;
    gap: var(--space-md);
    padding: var(--space-md);
    color: var(--text-secondary);
    text-decoration: none;
    border-radius: var(--radius-md);
    transition: var(--transition-fast);
    margin-bottom: var(--space-xs);
}

.menu-link:hover,
.menu-link.active {
    background: var(--color-primary);
    color: white;
}

.menu-link i {
    width: 20px;
    text-align: center;
}

/* Main Content */
.main-content {
    padding-top: 70px;
    min-height: 100vh;
}

/* Sections */
.section {
    display: none;
    padding: var(--space-2xl);
    max-width: 1400px;
    margin: 0 auto;
    animation: fadeIn 0.5s ease;
}

.section.active {
    display: block;
}

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

.section-header {
    text-align: center;
    margin-bottom: var(--space-2xl);
}

.section-icon {
    width: 80px;
    height: 80px;
    margin: 0 auto var(--space-lg);
    background: var(--gradient-primary);
    border-radius: var(--radius-xl);
    display: flex;
    align-items: center;
    justify-content: center;
    font-size: 2.5rem;
    color: white;
    box-shadow: 0 10px 40px rgba(59, 130, 246, 0.3);
}

.section-title {
    font-size: 2.5rem;
    margin-bottom: var(--space-md);
    background: var(--gradient-primary);
    -webkit-background-clip: text;
    -webkit-text-fill-color: transparent;
    background-clip: text;
}

.section-subtitle {
    font-size: 1.125rem;
    color: var(--text-muted);
    max-width: 600px;
    margin: 0 auto;
}

/* Home Section */
.home-section {
    padding: 0;
    max-width: none;
}

.hero {
    min-height: calc(100vh - 70px);
    display: flex;
    align-items: center;
    justify-content: center;
    padding: var(--space-2xl);
    position: relative;
    overflow: hidden;
}

.hero-bg {
    position: absolute;
    top: 0;
    left: 0;
    right: 0;
    bottom: 0;
    overflow: hidden;
}

.floating-shape {
    position: absolute;
    border-radius: 50%;
    filter: blur(60px);
    opacity: 0.5;
    animation: float 20s ease-in-out infinite;
}

.shape-1 {
    width: 400px;
    height: 400px;
    background: var(--color-primary);
    top: -100px;
    left: -100px;
    animation-delay: 0s;
}

.shape-2 {
    width: 300px;
    height: 300px;
    background: var(--color-secondary);
    bottom: -50px;
    right: -50px;
    animation-delay: -5s;
}

.shape-3 {
    width: 250px;
    height: 250px;
    background: var(--color-accent);
    top: 50%;
    left: 50%;
    animation-delay: -10s;
}

.shape-4 {
    width: 200px;
    height: 200px;
    background: var(--color-salt);
    bottom: 20%;
    left: 20%;
    animation-delay: -15s;
}

@keyframes float {
    0%, 100% { transform: translate(0, 0) scale(1); }
    25% { transform: translate(50px, -50px) scale(1.1); }
    50% { transform: translate(-30px, 30px) scale(0.9); }
    75% { transform: translate(30px, 50px) scale(1.05); }
}

.hero-content {
    text-align: center;
    z-index: 1;
    max-width: 800px;
}

.hero-badge {
    display: inline-flex;
    align-items: center;
    gap: var(--space-sm);
    background: var(--glass-bg);
    padding: var(--space-sm) var(--space-lg);
    border-radius: var(--radius-full);
    margin-bottom: var(--space-lg);
    font-size: 0.875rem;
    color: var(--text-secondary);
}

.hero-badge i {
    color: var(--color-primary);
}

.hero-title {
    font-size: clamp(2.5rem, 6vw, 4.5rem);
    margin-bottom: var(--space-lg);
    line-height: 1.1;
}

.gradient-text {
    background: var(--gradient-acid);
    -webkit-background-clip: text;
    -webkit-text-fill-color: transparent;
    background-clip: text;
}

.gradient-text-alt {
    background: var(--gradient-base);
    -webkit-background-clip: text;
    -webkit-text-fill-color: transparent;
    background-clip: text;
}

.hero-subtitle {
    font-size: 1.25rem;
    color: var(--text-secondary);
    margin-bottom: var(--space-xl);
    max-width: 600px;
    margin-left: auto;
    margin-right: auto;
}

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

.stat-card {
    padding: var(--space-lg);
    text-align: center;
    min-width: 140px;
}

.stat-card i {
    font-size: 2rem;
    color: var(--color-primary);
    margin-bottom: var(--space-sm);
}

.stat-value {
    display: block;
    font-family: var(--font-display);
    font-size: 1.75rem;
    font-weight: 700;
    color: var(--text-primary);
}

.stat-label {
    font-size: 0.875rem;
    color: var(--text-muted);
}

.hero-actions {
    display: flex;
    justify-content: center;
    gap: var(--space-md);
    margin-bottom: var(--space-xl);
    flex-wrap: wrap;
}

/* Buttons */
.btn {
    display: inline-flex;
    align-items: center;
    gap: var(--space-sm);
    padding: var(--space-md) var(--space-lg);
    border-radius: var(--radius-lg);
    font-family: var(--font-display);
    font-weight: 600;
    font-size: 1rem;
    cursor: pointer;
    transition: var(--transition-fast);
    border: none;
    text-decoration: none;
}

.btn-primary {
    background: var(--gradient-primary);
    color: white;
    box-shadow: 0 4px 15px rgba(59, 130, 246, 0.4);
}

.btn-primary:hover {
    transform: translateY(-3px);
    box-shadow: 0 8px 25px rgba(59, 130, 246, 0.5);
}

.btn-secondary {
    background: var(--glass-bg);
    color: var(--text-primary);
    border: 1px solid var(--glass-border);
}

.btn-secondary:hover {
    background: var(--bg-tertiary);
    transform: translateY(-3px);
}

.btn-large {
    padding: var(--space-md) var(--space-xl);
    font-size: 1.125rem;
}

.motivation-quote {
    max-width: 600px;
    margin: 0 auto;
    padding: var(--space-lg);
    position: relative;
}

.motivation-quote i {
    font-size: 1.5rem;
    color: var(--color-accent);
    margin-bottom: var(--space-sm);
}

.motivation-quote p {
    font-size: 1.125rem;
    font-style: italic;
    color: var(--text-secondary);
    margin-bottom: var(--space-sm);
}

.quote-author {
    font-size: 0.875rem;
    color: var(--text-muted);
}

/* Hero Visual */
.hero-visual {
    position: absolute;
    right: 5%;
    top: 50%;
    transform: translateY(-50%);
    opacity: 0.3;
    pointer-events: none;
}

.chemistry-scene {
    position: relative;
    width: 300px;
    height: 400px;
}

.beaker {
    position: absolute;
    width: 60px;
    height: 80px;
    border: 3px solid var(--text-muted);
    border-top: none;
    border-radius: 0 0 var(--radius-md) var(--radius-md);
    overflow: hidden;
}

.beaker-1 {
    left: 0;
    top: 50px;
}

.beaker-2 {
    left: 100px;
    top: 80px;
}

.beaker-3 {
    left: 200px;
    top: 40px;
}

.liquid {
    position: absolute;
    bottom: 0;
    left: 0;
    right: 0;
    height: 60%;
    animation: wave 3s ease-in-out infinite;
}

.acid-liquid {
    background: var(--gradient-acid);
}

.base-liquid {
    background: var(--gradient-base);
}

.salt-liquid {
    background: var(--gradient-salt);
}

@keyframes wave {
    0%, 100% { transform: translateY(0); }
    50% { transform: translateY(-5px); }
}

.bubbles {
    position: absolute;
    bottom: 10px;
    left: 50%;
    transform: translateX(-50%);
}

.bubbles::before,
.bubbles::after {
    content: '';
    position: absolute;
    width: 8px;
    height: 8px;
    background: rgba(255, 255, 255, 0.5);
    border-radius: 50%;
    animation: bubble-rise 2s ease-in-out infinite;
}

.bubbles::after {
    left: 15px;
    animation-delay: 0.5s;
}

@keyframes bubble-rise {
    0% { transform: translateY(0) scale(1); opacity: 1; }
    100% { transform: translateY(-40px) scale(0.5); opacity: 0; }
}

.molecule {
    position: absolute;
    font-size: 1.5rem;
    font-weight: 700;
    animation: float-molecule 4s ease-in-out infinite;
}

.molecule-1 { left: 30px; top: 200px; color: var(--color-acid); animation-delay: 0s; }
.molecule-2 { left: 150px; top: 250px; color: var(--color-base); animation-delay: -1s; }
.molecule-3 { left: 250px; top: 180px; color: var(--color-salt); animation-delay: -2s; }
.molecule-4 { left: 80px; top: 300px; color: var(--color-secondary); animation-delay: -3s; }

@keyframes float-molecule {
    0%, 100% { transform: translate(0, 0); }
    25% { transform: translate(10px, -10px); }
    50% { transform: translate(-5px, 5px); }
    75% { transform: translate(5px, 10px); }
}

/* Progress Overview */
.progress-overview {
    margin: var(--space-2xl);
    padding: var(--space-xl);
}

.progress-overview h3 {
    text-align: center;
    margin-bottom: var(--space-xl);
    font-size: 1.5rem;
}

.progress-grid {
    display: grid;
    grid-template-columns: repeat(auto-fit, minmax(150px, 1fr));
    gap: var(--space-lg);
}

.progress-item {
    text-align: center;
}

.progress-ring {
    position: relative;
    width: 100px;
    height: 100px;
    margin: 0 auto var(--space-sm);
}

.progress-ring svg {
    transform: rotate(-90deg);
}

.progress-bg {
    fill: none;
    stroke: var(--bg-tertiary);
    stroke-width: 8;
}

.progress-fill {
    fill: none;
    stroke: url(#progress-gradient);
    stroke-width: 8;
    stroke-linecap: round;
    stroke-dasharray: 283;
    stroke-dashoffset: 283;
    transition: stroke-dashoffset var(--transition-slow);
}

.progress-ring i {
    position: absolute;
    top: 50%;
    left: 50%;
    transform: translate(-50%, -50%);
    font-size: 1.5rem;
    color: var(--color-primary);
}

.progress-item span {
    font-size: 0.875rem;
    color: var(--text-secondary);
}

/* Overview Section */
.overview-grid {
    display: grid;
    grid-template-columns: repeat(auto-fit, minmax(350px, 1fr));
    gap: var(--space-xl);
    margin-bottom: var(--space-2xl);
}

.concept-card {
    padding: var(--space-xl);
    transition: var(--transition-normal);
}

.concept-card:hover {
    transform: translateY(-5px);
}

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

.concept-icon {
    width: 60px;
    height: 60px;
    border-radius: var(--radius-lg);
    display: flex;
    align-items: center;
    justify-content: center;
    font-size: 1.75rem;
}

.acid-icon {
    background: var(--gradient-acid);
}

.base-icon {
    background: var(--gradient-base);
}

.salt-icon {
    background: var(--gradient-salt);
}

.concept-header h3 {
    font-size: 1.5rem;
}

.simple-def {
    background: rgba(59, 130, 246, 0.1);
    padding: var(--space-md);
    border-radius: var(--radius-md);
    margin-bottom: var(--space-md);
    border-left: 4px solid var(--color-primary);
}

.simple-def .highlight {
    color: var(--color-primary);
    font-weight: 600;
}

.analogy-box {
    background: rgba(249, 115, 22, 0.1);
    padding: var(--space-md);
    border-radius: var(--radius-md);
    margin-bottom: var(--space-md);
    display: flex;
    gap: var(--space-md);
    align-items: flex-start;
}

.analogy-box i {
    color: var(--color-accent);
    font-size: 1.25rem;
    margin-top: 2px;
}

.key-points {
    margin-bottom: var(--space-md);
}

.key-points h4 {
    display: flex;
    align-items: center;
    gap: var(--space-sm);
    margin-bottom: var(--space-sm);
    color: var(--color-secondary);
}

.key-points ul {
    list-style: none;
}

.key-points li {
    display: flex;
    align-items: center;
    gap: var(--space-sm);
    padding: var(--space-xs) 0;
    color: var(--text-secondary);
}

.key-points li i {
    color: var(--color-secondary);
    font-size: 0.75rem;
}

.examples-box {
    margin-bottom: var(--space-md);
}

.examples-box h4 {
    margin-bottom: var(--space-sm);
    color: var(--text-primary);
}

.example-tags {
    display: flex;
    flex-wrap: wrap;
    gap: var(--space-sm);
}

.tag {
    background: var(--bg-tertiary);
    padding: var(--space-xs) var(--space-sm);
    border-radius: var(--radius-full);
    font-size: 0.875rem;
    color: var(--text-secondary);
    transition: var(--transition-fast);
}

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

.memory-trick {
    background: rgba(168, 85, 247, 0.1);
    padding: var(--space-md);
    border-radius: var(--radius-md);
    display: flex;
    gap: var(--space-md);
    align-items: flex-start;
}

.memory-trick i {
    color: var(--color-salt);
}

.mark-complete-btn {
    width: 100%;
    margin-top: var(--space-lg);
    padding: var(--space-md);
    background: var(--bg-tertiary);
    border: 2px dashed var(--glass-border);
    border-radius: var(--radius-md);
    color: var(--text-secondary);
    cursor: pointer;
    transition: var(--transition-fast);
    display: flex;
    align-items: center;
    justify-content: center;
    gap: var(--space-sm);
}

.mark-complete-btn:hover,
.mark-complete-btn.completed {
    background: var(--color-secondary);
    border-color: var(--color-secondary);
    color: white;
}

/* Quick Recap */
.quick-recap {
    padding: var(--space-xl);
}

.quick-recap h3 {
    text-align: center;
    margin-bottom: var(--space-lg);
}

.recap-grid {
    display: grid;
    grid-template-columns: repeat(auto-fit, minmax(200px, 1fr));
    gap: var(--space-lg);
}

.recap-item {
    display: flex;
    align-items: center;
    gap: var(--space-md);
    padding: var(--space-md);
    background: var(--bg-tertiary);
    border-radius: var(--radius-lg);
}

.recap-icon {
    width: 50px;
    height: 50px;
    border-radius: var(--radius-lg);
    display: flex;
    align-items: center;
    justify-content: center;
    font-size: 1.5rem;
    font-weight: 700;
}

.recap-icon.acid {
    background: var(--gradient-acid);
}

.recap-icon.base {
    background: var(--gradient-base);
}

.recap-icon.salt {
    background: var(--gradient-salt);
}

.recap-item strong {
    display: block;
    color: var(--text-primary);
}

.recap-item p {
    font-size: 0.875rem;
    color: var(--text-muted);
}

/* Lab Section */
.lab-container {
    padding: var(--space-xl);
}

.lab-workspace {
    display: grid;
    grid-template-columns: 1fr 350px;
    gap: var(--space-xl);
    margin-bottom: var(--space-xl);
}

.lab-table {
    background: var(--bg-tertiary);
    border-radius: var(--radius-lg);
    padding: var(--space-xl);
    display: flex;
    flex-direction: column;
    align-items: center;
    justify-content: center;
    min-height: 400px;
}

.beaker-container {
    position: relative;
    margin-bottom: var(--space-lg);
}

.beaker-main {
    width: 120px;
    height: 150px;
    border: 4px solid var(--text-muted);
    border-top: none;
    border-radius: 0 0 var(--radius-lg) var(--radius-lg);
    position: relative;
    overflow: hidden;
    background: rgba(255, 255, 255, 0.05);
}

.beaker-liquid {
    position: absolute;
    bottom: 0;
    left: 0;
    right: 0;
    height: 0%;
    transition: var(--transition-slow);
    border-radius: 0 0 var(--radius-md) var(--radius-md);
}

.beaker-liquid.acid {
    background: var(--gradient-acid);
    height: 60%;
}

.beaker-liquid.base {
    background: var(--gradient-base);
    height: 60%;
}

.beaker-liquid.salt {
    background: var(--gradient-salt);
    height: 60%;
}

.beaker-liquid.mixed {
    background: var(--gradient-primary);
    height: 70%;
}

.beaker-label {
    position: absolute;
    top: 50%;
    left: 50%;
    transform: translate(-50%, -50%);
    font-weight: 600;
    color: var(--text-primary);
    text-shadow: 0 2px 4px rgba(0, 0, 0, 0.5);
}

.beaker-stand {
    width: 140px;
    height: 10px;
    background: var(--text-muted);
    border-radius: var(--radius-full);
    margin-top: var(--space-xs);
}

.reaction-effects {
    position: absolute;
    top: 0;
    left: 0;
    right: 0;
    bottom: 0;
    pointer-events: none;
}

.reaction-info {
    text-align: center;
}

.reaction-info h4 {
    margin-bottom: var(--space-sm);
    color: var(--text-primary);
}

.chemicals-panel {
    background: var(--bg-tertiary);
    border-radius: var(--radius-lg);
    padding: var(--space-lg);
}

.chemicals-panel h4 {
    margin-bottom: var(--space-md);
    display: flex;
    align-items: center;
    gap: var(--space-sm);
}

.chemical-category {
    margin-bottom: var(--space-lg);
}

.chemical-category h5 {
    font-size: 0.875rem;
    color: var(--text-muted);
    margin-bottom: var(--space-sm);
    text-transform: uppercase;
    letter-spacing: 1px;
}

.chemical-grid {
    display: grid;
    grid-template-columns: repeat(auto-fit, minmax(100px, 1fr));
    gap: var(--space-sm);
}

.chemical-btn {
    padding: var(--space-sm);
    background: var(--bg-secondary);
    border: 2px solid transparent;
    border-radius: var(--radius-md);
    cursor: pointer;
    transition: var(--transition-fast);
    text-align: center;
}

.chemical-btn:hover {
    border-color: var(--color-primary);
    transform: translateY(-2px);
}

.chemical-btn.selected {
    border-color: var(--color-primary);
    background: rgba(59, 130, 246, 0.2);
}

.chemical-btn.acid-btn:hover,
.chemical-btn.acid-btn.selected {
    border-color: var(--color-acid);
    background: rgba(239, 68, 68, 0.2);
}

.chemical-btn.base-btn:hover,
.chemical-btn.base-btn.selected {
    border-color: var(--color-base);
    background: rgba(59, 130, 246, 0.2);
}

.chemical-formula {
    display: block;
    font-weight: 700;
    font-size: 1rem;
    color: var(--text-primary);
}

.chemical-name {
    font-size: 0.625rem;
    color: var(--text-muted);
}

.lab-actions {
    display: flex;
    justify-content: center;
    gap: var(--space-md);
    margin-bottom: var(--space-xl);
}

.reaction-history {
    padding: var(--space-lg);
}

.reaction-history h4 {
    margin-bottom: var(--space-md);
    display: flex;
    align-items: center;
    gap: var(--space-sm);
}

.history-list {
    max-height: 200px;
    overflow-y: auto;
}

.empty-history {
    text-align: center;
    color: var(--text-muted);
    padding: var(--space-lg);
}

/* Examples Section */
.examples-tabs {
    display: flex;
    justify-content: center;
    gap: var(--space-sm);
    margin-bottom: var(--space-xl);
}

.tab-btn {
    padding: var(--space-md) var(--space-xl);
    background: var(--bg-tertiary);
    border: none;
    border-radius: var(--radius-full);
    color: var(--text-secondary);
    cursor: pointer;
    transition: var(--transition-fast);
    font-weight: 600;
}

.tab-btn:hover {
    background: var(--bg-secondary);
    color: var(--text-primary);
}

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

.tab-panel {
    display: none;
}

.tab-panel.active {
    display: block;
    animation: fadeIn 0.3s ease;
}

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

.example-card {
    padding: var(--space-lg);
    transition: var(--transition-normal);
}

.example-card:hover {
    transform: translateY(-5px);
}

.example-image {
    width: 100%;
    height: 150px;
    background: var(--bg-tertiary);
    border-radius: var(--radius-md);
    display: flex;
    align-items: center;
    justify-content: center;
    margin-bottom: var(--space-md);
}

.emoji-display {
    font-size: 4rem;
}

.example-card h4 {
    margin-bottom: var(--space-xs);
    color: var(--text-primary);
}

.chemical-name {
    color: var(--color-primary);
    font-size: 0.875rem;
    margin-bottom: var(--space-md);
}

.example-details {
    font-size: 0.875rem;
    color: var(--text-secondary);
}

.example-details p {
    margin-bottom: var(--space-xs);
}

/* Story Section */
.characters-intro {
    display: flex;
    justify-content: center;
    gap: var(--space-xl);
    margin-bottom: var(--space-2xl);
    flex-wrap: wrap;
}

.character-card {
    text-align: center;
    padding: var(--space-xl);
    min-width: 200px;
    cursor: pointer;
    transition: var(--transition-normal);
}

.character-card:hover {
    transform: scale(1.05);
}

.character-avatar {
    font-size: 4rem;
    margin-bottom: var(--space-md);
}

.character-card h3 {
    margin-bottom: var(--space-xs);
}

.character-card p {
    color: var(--text-muted);
    margin-bottom: var(--space-sm);
}

.character-trait {
    display: inline-block;
    background: var(--bg-tertiary);
    padding: var(--space-xs) var(--space-md);
    border-radius: var(--radius-full);
    font-size: 0.75rem;
    color: var(--text-secondary);
}

.story-container {
    max-width: 800px;
    margin: 0 auto;
    padding: var(--space-xl);
}

.story-chat {
    margin-bottom: var(--space-xl);
    max-height: 500px;
    overflow-y: auto;
}

.chat-message {
    display: flex;
    gap: var(--space-md);
    margin-bottom: var(--space-lg);
    animation: slideIn 0.3s ease;
}

@keyframes slideIn {
    from { opacity: 0; transform: translateX(-20px); }
    to { opacity: 1; transform: translateX(0); }
}

.chat-message.character-base {
    flex-direction: row-reverse;
}

.chat-avatar {
    width: 50px;
    height: 50px;
    border-radius: 50%;
    display: flex;
    align-items: center;
    justify-content: center;
    font-size: 1.5rem;
    flex-shrink: 0;
}

.character-acid .chat-avatar {
    background: var(--gradient-acid);
}

.character-base .chat-avatar {
    background: var(--gradient-base);
}

.character-salt .chat-avatar {
    background: var(--gradient-salt);
}

.chat-bubble {
    background: var(--bg-tertiary);
    padding: var(--space-md);
    border-radius: var(--radius-lg);
    max-width: 70%;
}

.character-acid .chat-bubble {
    border-bottom-left-radius: var(--radius-xs);
}

.character-base .chat-bubble {
    border-bottom-right-radius: var(--radius-xs);
}

.chat-bubble p {
    margin-bottom: var(--space-xs);
}

.chat-bubble p:last-child {
    margin-bottom: 0;
}

.story-controls {
    display: flex;
    justify-content: space-between;
    align-items: center;
}

/* Games Section */
.games-grid {
    display: grid;
    grid-template-columns: repeat(auto-fit, minmax(300px, 1fr));
    gap: var(--space-xl);
}

.game-card {
    padding: var(--space-xl);
    text-align: center;
    transition: var(--transition-normal);
}

.game-card:hover {
    transform: translateY(-5px);
}

.game-icon {
    width: 80px;
    height: 80px;
    margin: 0 auto var(--space-lg);
    background: var(--gradient-primary);
    border-radius: var(--radius-xl);
    display: flex;
    align-items: center;
 justify-content: center;
    font-size: 2.5rem;
    color: white;
}

.game-card h3 {
    margin-bottom: var(--space-sm);
}

.game-card > p {
    color: var(--text-muted);
    margin-bottom: var(--space-md);
}

.game-stats {
    display: flex;
    justify-content: center;
    gap: var(--space-lg);
    margin-bottom: var(--space-md);
    font-size: 0.875rem;
}

.game-stats span {
    display: flex;
    align-items: center;
    gap: var(--space-xs);
}

.game-stats i {
    color: var(--color-accent);
}

/* Indicators Section */
.indicators-intro {
    max-width: 600px;
    margin: 0 auto var(--space-2xl);
    padding: var(--space-lg);
    text-align: center;
}

.indicators-intro h3 {
    margin-bottom: var(--space-sm);
    display: flex;
    align-items: center;
    justify-content: center;
    gap: var(--space-sm);
}

.indicators-grid {
    display: grid;
    grid-template-columns: repeat(auto-fit, minmax(280px, 1fr));
    gap: var(--space-xl);
    margin-bottom: var(--space-2xl);
}

.indicator-card {
    padding: var(--space-xl);
}

.indicator-header {
    display: flex;
    justify-content: space-between;
    align-items: center;
    margin-bottom: var(--space-lg);
}

.indicator-header h3 {
    font-size: 1.25rem;
}

.indicator-type {
    background: var(--bg-tertiary);
    padding: var(--space-xs) var(--space-sm);
    border-radius: var(--radius-full);
    font-size: 0.75rem;
    color: var(--text-muted);
}

.indicator-colors {
    display: flex;
    gap: var(--space-sm);
    margin-bottom: var(--space-lg);
}

.color-box {
    flex: 1;
    text-align: center;
}

.color {
    width: 100%;
    height: 60px;
    border-radius: var(--radius-md);
    margin-bottom: var(--space-xs);
}

.color-box span {
    font-size: 0.75rem;
    color: var(--text-muted);
}

.indicator-demo {
    display: flex;
    gap: var(--space-sm);
    margin-bottom: var(--space-md);
}

.demo-btn {
    flex: 1;
    padding: var(--space-sm);
    background: var(--bg-tertiary);
    border: none;
    border-radius: var(--radius-md);
    color: var(--text-secondary);
    cursor: pointer;
    transition: var(--transition-fast);
}

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

.indicator-source,
.memory-tip {
    font-size: 0.875rem;
    color: var(--text-muted);
}

.memory-tip i {
    color: var(--color-salt);
}

.universal-colors {
    margin-bottom: var(--space-lg);
}

.ph-scale-mini {
    display: flex;
    height: 40px;
    border-radius: var(--radius-md);
    overflow: hidden;
    margin-bottom: var(--space-sm);
}

.ph-item {
    flex: 1;
    display: flex;
    align-items: center;
    justify-content: center;
    font-size: 0.75rem;
    font-weight: 600;
    color: white;
    text-shadow: 0 1px 2px rgba(0, 0, 0, 0.5);
}

.indicators-summary {
    padding: var(--space-xl);
}

.indicators-summary h3 {
    margin-bottom: var(--space-lg);
    display: flex;
    align-items: center;
    gap: var(--space-sm);
}

.data-table {
    width: 100%;
    border-collapse: collapse;
}

.data-table th,
.data-table td {
    padding: var(--space-md);
    text-align: left;
    border-bottom: 1px solid var(--glass-border);
}

.data-table th {
    background: var(--bg-tertiary);
    font-weight: 600;
    color: var(--text-primary);
}

.data-table td {
    color: var(--text-secondary);
}

.data-table tr:hover td {
    background: rgba(59, 130, 246, 0.05);
}

/* pH Scale Section */
.ph-container {
    padding: var(--space-xl);
    margin-bottom: var(--space-2xl);
}

.ph-scale-visual {
    margin-bottom: var(--space-xl);
}

.ph-bar {
    display: flex;
    height: 80px;
    border-radius: var(--radius-lg);
    overflow: hidden;
}

.ph-segment {
    flex: 1;
    display: flex;
    flex-direction: column;
    align-items: center;
    justify-content: center;
    cursor: pointer;
    transition: var(--transition-fast);
    position: relative;
}

.ph-segment:hover {
    transform: scaleY(1.1);
    z-index: 1;
}

.ph-number {
    font-size: 1.25rem;
    font-weight: 700;
    color: white;
    text-shadow: 0 1px 2px rgba(0, 0, 0, 0.5);
}

.ph-label {
    font-size: 0.625rem;
    color: white;
    text-align: center;
    padding: 0 var(--space-xs);
    opacity: 0.8;
}

.ph-info-panel {
    background: var(--bg-tertiary);
    border-radius: var(--radius-lg);
    padding: var(--space-xl);
    text-align: center;
}

.ph-info-content h3 {
    margin-bottom: var(--space-md);
}

.ph-facts {
    padding: var(--space-xl);
}

.ph-facts h3 {
    text-align: center;
    margin-bottom: var(--space-xl);
    display: flex;
    align-items: center;
    justify-content: center;
    gap: var(--space-sm);
}

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

.fact-card {
    background: var(--bg-tertiary);
    padding: var(--space-lg);
    border-radius: var(--radius-lg);
    text-align: center;
    transition: var(--transition-fast);
}

.fact-card:hover {
    transform: translateY(-3px);
}

.fact-card i {
    font-size: 2rem;
    color: var(--color-primary);
    margin-bottom: var(--space-sm);
}

/* Reactions Section */
.reactions-nav {
    display: flex;
    flex-wrap: wrap;
    justify-content: center;
    gap: var(--space-sm);
    margin-bottom: var(--space-xl);
}

.reaction-tab {
    padding: var(--space-md) var(--space-lg);
    background: var(--bg-tertiary);
    border: none;
    border-radius: var(--radius-full);
    color: var(--text-secondary);
    cursor: pointer;
    transition: var(--transition-fast);
    font-weight: 600;
}

.reaction-tab:hover {
    background: var(--bg-secondary);
    color: var(--text-primary);
}

.reaction-tab.active {
    background: var(--gradient-primary);
    color: white;
}

.reaction-viewer {
    display: grid;
    grid-template-columns: 1fr 1fr;
    gap: var(--space-xl);
    padding: var(--space-xl);
}

.reaction-animation {
    background: var(--bg-tertiary);
    border-radius: var(--radius-lg);
    min-height: 400px;
    display: flex;
    align-items: center;
    justify-content: center;
}

.reaction-scene {
    width: 100%;
    padding: var(--space-xl);
}

.reaction-visual {
    display: flex;
    align-items: center;
    justify-content: center;
    gap: var(--space-md);
    flex-wrap: wrap;
}

.reactants,
.products {
    display: flex;
    align-items: center;
    gap: var(--space-md);
}

.chemical-bottle {
    width: 80px;
    height: 100px;
    border: 3px solid var(--text-muted);
    border-top: none;
    border-radius: 0 0 var(--radius-md) var(--radius-md);
    position: relative;
    overflow: hidden;
    display: flex;
    align-items: flex-end;
    justify-content: center;
    padding-bottom: var(--space-sm);
}

.chemical-bottle .liquid {
    position: absolute;
    bottom: 0;
    left: 0;
    right: 0;
    height: 60%;
}

.chemical-bottle .liquid.acid {
    background: var(--gradient-acid);
}

.chemical-bottle .liquid.salt {
    background: var(--gradient-salt);
}

.chemical-bottle span {
    position: relative;
    z-index: 1;
    font-weight: 700;
    color: white;
    text-shadow: 0 1px 2px rgba(0, 0, 0, 0.5);
}

.metal-piece {
    width: 60px;
    height: 60px;
    background: linear-gradient(135deg, #9ca3af, #6b7280);
    border-radius: var(--radius-md);
    display: flex;
    align-items: center;
    justify-content: center;
    font-weight: 700;
    color: white;
}

.gas-bubbles {
    width: 60px;
    height: 60px;
    background: rgba(255, 255, 255, 0.2);
    border-radius: 50%;
    display: flex;
    align-items: center;
    justify-content: center;
    font-weight: 700;
    color: var(--text-primary);
    border: 2px dashed var(--text-muted);
}

.plus {
    font-size: 1.5rem;
    color: var(--text-muted);
}

.reaction-arrow {
    font-size: 2rem;
    color: var(--color-primary);
}

.reaction-details {
    padding: var(--space-lg);
}

.reaction-info h3 {
    margin-bottom: var(--space-lg);
    color: var(--text-primary);
}

.equation-box {
    background: var(--bg-tertiary);
    padding: var(--space-lg);
    border-radius: var(--radius-lg);
    margin-bottom: var(--space-lg);
    text-align: center;
}

.chemical-equation {
    font-size: 1.25rem;
    font-family: 'Courier New', monospace;
    color: var(--color-primary);
}

.reaction-explanation h4 {
    margin-bottom: var(--space-sm);
    margin-top: var(--space-lg);
    display: flex;
    align-items: center;
    gap: var(--space-sm);
    color: var(--color-secondary);
}

.reaction-explanation p {
    color: var(--text-secondary);
    margin-bottom: var(--space-md);
}

.important-points {
    margin-top: var(--space-xl);
    padding: var(--space-lg);
    background: rgba(249, 115, 22, 0.1);
    border-radius: var(--radius-lg);
    border-left: 4px solid var(--color-accent);
}

.important-points h4 {
    color: var(--color-accent);
    margin-bottom: var(--space-sm);
}

.important-points ul {
    list-style: none;
}

.important-points li {
    padding: var(--space-xs) 0;
    color: var(--text-secondary);
    position: relative;
    padding-left: var(--space-md);
}

.important-points li::before {
    content: '•';
    color: var(--color-accent);
    position: absolute;
    left: 0;
}

/* Manufacturing Section */
.manufacturing-grid {
    display: grid;
    grid-template-columns: repeat(auto-fit, minmax(350px, 1fr));
    gap: var(--space-xl);
}

.salt-card {
    padding: var(--space-xl);
    transition: var(--transition-normal);
}

.salt-card:hover {
    transform: translateY(-5px);
}

.salt-header {
    text-align: center;
    margin-bottom: var(--space-lg);
}

.salt-icon {
    font-size: 3rem;
    margin-bottom: var(--space-sm);
}

.salt-header h3 {
    margin-bottom: var(--space-xs);
}

.salt-header .chemical-formula {
    display: inline-block;
    background: var(--bg-tertiary);
    padding: var(--space-xs) var(--space-md);
    border-radius: var(--radius-full);
    font-family: 'Courier New', monospace;
    color: var(--color-primary);
}

.salt-content h4 {
    display: flex;
    align-items: center;
    gap: var(--space-sm);
    margin-bottom: var(--space-sm);
    color: var(--text-primary);
}

.prep-method {
    margin-bottom: var(--space-lg);
}

.prep-method .equation {
    background: var(--bg-tertiary);
    padding: var(--space-md);
    border-radius: var(--radius-md);
    font-family: 'Courier New', monospace;
    color: var(--color-secondary);
    margin-bottom: var(--space-sm);
    overflow-x: auto;
}

.uses-list {
    margin-bottom: var(--space-lg);
}

.uses-list ul {
    list-style: none;
}

.uses-list li {
    padding: var(--space-xs) 0;
    color: var(--text-secondary);
    display: flex;
    align-items: center;
    gap: var(--space-sm);
}

.uses-list li::before {
    content: '✓';
    color: var(--color-secondary);
    font-weight: 700;
}

.memory-trick-box {
    background: rgba(168, 85, 247, 0.1);
    padding: var(--space-md);
    border-radius: var(--radius-md);
    display: flex;
    align-items: center;
    gap: var(--space-md);
}

.memory-trick-box i {
    color: var(--color-salt);
    font-size: 1.25rem;
}

/* Memory Section */
.memory-grid {
    display: grid;
    grid-template-columns: repeat(auto-fit, minmax(350px, 1fr));
    gap: var(--space-xl);
}

.memory-card {
    padding: var(--space-xl);
    transition: var(--transition-normal);
}

.memory-card:hover {
    transform: translateY(-5px);
}

.memory-icon {
    font-size: 3rem;
    text-align: center;
    margin-bottom: var(--space-lg);
}

.memory-card h3 {
    text-align: center;
    margin-bottom: var(--space-lg);
}

.memory-content h4 {
    display: flex;
    align-items: center;
    gap: var(--space-sm);
    margin-bottom: var(--space-sm);
    color: var(--color-primary);
}

.mnemonic {
    background: var(--bg-tertiary);
    padding: var(--space-md);
    border-radius: var(--radius-md);
    margin-bottom: var(--space-md);
}

.mnemonic p {
    font-style: italic;
    color: var(--text-secondary);
    line-height: 1.8;
}

.visual-trick {
    padding: var(--space-md);
    border-left: 4px solid var(--color-accent);
    background: rgba(249, 115, 22, 0.05);
}

.visual-trick p {
    color: var(--text-secondary);
}

/* Responsive Design */
@media (max-width: 1024px) {
    .hero-visual {
        display: none;
    }
    
    .lab-workspace {
        grid-template-columns: 1fr;
    }
    
    .reaction-viewer {
        grid-template-columns: 1fr;
    }
}

@media (max-width: 768px) {
    .main-nav {
        padding: 0 var(--space-md);
    }
    
    .nav-center {
        display: none;
    }
    
    .hero {
        padding: var(--space-xl) var(--space-md);
    }
    
    .hero-stats {
        flex-direction: column;
        align-items: center;
    }
    
    .section {
        padding: var(--space-xl) var(--space-md);
    }
    
    .overview-grid,
    .memory-grid {
        grid-template-columns: 1fr;
    }
    
    .characters-intro {
        flex-direction: column;
        align-items: center;
    }
    
    .ph-bar {
        flex-direction: column;
        height: auto;
    }
    
    .ph-segment {
        padding: var(--space-sm);
    }
    
    .reactions-nav {
        flex-direction: column;
    }
    
    .reaction-tab {
        width: 100%;
    }
}

@media (max-width: 480px) {
    .hero-title {
        font-size: 2rem;
    }
    
    .section-title {
        font-size: 1.75rem;
    }
    
    .games-grid,
    .manufacturing-grid {
        grid-template-columns: 1fr;
    }
}

/* Scrollbar Styling */
::-webkit-scrollbar {
    width: 8px;
    height: 8px;
}

::-webkit-scrollbar-track {
    background: var(--bg-secondary);
}

::-webkit-scrollbar-thumb {
    background: var(--bg-tertiary);
    border-radius: var(--radius-full);
}

::-webkit-scrollbar-thumb:hover {
    background: var(--color-primary);
}

/* Selection */
::selection {
    background: var(--color-primary);
    color: white;
}

/* Focus Styles */
button:focus,
a:focus {
    outline: 2px solid var(--color-primary);
    outline-offset: 2px;
}

/* Print Styles */
@media print {
    .main-nav,
    .mobile-menu,
    .loading-screen {
        display: none !important;
    }
    
    .section {
        display: block !important;
        page-break-after: always;
    }
}