::-webkit-scrollbar {
    display: none;
}

/* Reset and base styles */
* {
    margin: 0;
    padding: 0;
    box-sizing: border-box;
}

/* Theme Variables */
:root {
    /* Light theme colors */
    --primary: #2d7d4a;
    --primary-light: #43a862;
    --primary-dark: #1e5535;
    --secondary: #8d6e0a;
    --accent: #1e8bc7;
    --background: #fbfdf8;
    --surface: #ffffff;
    --text-primary: #1a2e1a;
    --text-secondary: #6b7280;
    --border: #e5e7eb;
    --shadow: rgba(26, 46, 26, 0.1);
    --destructive: #dc2626;

       /* Kids Rainbow Colors */
       --rainbow-red: #ff6b6b;
       --rainbow-orange: #ffa500;
       --rainbow-yellow: #ffd93d;
       --rainbow-green: #6bcf7f;
       --rainbow-blue: #4ecdc4;
       --rainbow-purple: #a78bfa;
       --rainbow-pink: #ff69b4;
}

[data-theme="dark"] {
    --primary: #43a862;
    --primary-light: #5cbf78;
    --primary-dark: #2d7d4a;
    --secondary: #facc15;
    --accent: #3b82f6;
    --background: #0f172a;
    --surface: #1e293b;
    --text-primary: #f8fafc;
    --text-secondary: #94a3b8;
    --border: #334155;
    --shadow: rgba(0, 0, 0, 0.3);
    --destructive: #dc2626;
}

[data-theme="forest"] {
    --primary: #16a34a;
    --primary-light: #22c55e;
    --primary-dark: #15803d;
    --secondary: #ca8a04;
    --accent: #0ea5e9;
    --background: #f0f4f0;
    --surface: #ffffff;
    --text-primary: #1c3a1c;
    --text-secondary: #6b7b6b;
    --border: #d4d4aa;
    --shadow: rgba(34, 197, 94, 0.15);
    --destructive: #dc2626;
}

[data-theme="ocean"] {
    --primary: #0891b2;
    --primary-light: #06b6d4;
    --primary-dark: #0e7490;
    --secondary: #0ea5e9;
    --accent: #8b5cf6;
    --background: #f0f9ff;
    --surface: #ffffff;
    --text-primary: #164e63;
    --text-secondary: #64748b;
    --border: #bae6fd;
    --shadow: rgba(6, 182, 212, 0.15);
    --destructive: #dc2626;
}

[data-theme="sunset"] {
    --primary: #dc2626;
    --primary-light: #ef4444;
    --primary-dark: #b91c1c;
    --secondary: #f97316;
    --accent: #8b5cf6;
    --background: #fef7f0;
    --surface: #ffffff;
    --text-primary: #7c1d1d;
    --text-secondary: #78716c;
    --border: #fed7aa;
    --shadow: rgba(239, 68, 68, 0.15);
    --destructive: #dc2626;
}

html {
    overflow-x: hidden;
    height: 100%;
}

body {
    font-family: -apple-system, BlinkMacSystemFont, 'Segoe UI', Roboto, sans-serif;
    background-color: var(--background);
    color: var(--text-primary);
    line-height: 1.6;
    height: 100vh;
    overflow-x: hidden;
    transition: all 0.3s ease;
}

/* Navigation */
.navbar {
    position: fixed;
    top: 0;
    left: 0;
    right: 0;
    background-color: var(--surface);
    border-bottom: 1px solid var(--border);
    box-shadow: 0 4px 6px var(--shadow);
    z-index: 100;
    height: 64px;
}

.nav-container {
    display: flex;
    justify-content: space-between;
    align-items: center;
    padding: 0 2rem;
    height: 100%;
    max-width: 1200px;
    margin: 0 auto;
}

.nav-logo {
    display: flex;
    align-items: center;
    gap: 0.5rem;
    font-size: 1.5rem;
    font-weight: bold;
    color: var(--primary);
}

.logo-link {
    text-decoration: none;
    color: inherit;
}

.logo-icon {
    font-size: 2rem;
}

.nav-menu {
    display: flex;
    list-style: none;
    gap: 1rem;
}

.nav-menu li a {
    color: var(--primary);
    text-decoration: none;
    font-weight: 500;
    padding: 0.5rem 1rem;
    border-radius: 0.5rem;
    transition: all 0.3s ease;
    display: flex;
    align-items: center;
    gap: 0.5rem;
    font-size: 1rem;
}

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

.nav-text {
    display: inline;
}

/* Main Content */
.main-content {
    margin-top: 64px;
    height: calc(100vh - 64px);
    overflow-y: auto;
}

.section {
    display: none;
    padding: 2rem;
    max-width: 1200px;
    margin: 0 auto;
    min-height: calc(100vh - 64px);
    animation: fadeInUp 0.5s ease;
}

.section.active {
    display: block;
}

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

/* Section Headers */
.section-header {
    text-align: center;
    margin-bottom: 3rem;
}

.section-header h2 {
    font-size: 2.5rem;
    color: var(--primary);
    margin-bottom: 1rem;
}

.section-header p {
    font-size: 1.25rem;
    color: var(--text-secondary);
}

/* Hero Section */
.hero {
    display: grid;
    grid-template-columns: 1fr 1fr;
    gap: 3rem;
    align-items: center;
    margin-bottom: 3rem;
    min-height: 60vh;
}

.hero-content h1 {
    font-size: 3rem;
    color: var(--primary);
    margin-bottom: 1.5rem;
    font-weight: bold;
}

.hero-content p {
    font-size: 1.25rem;
    color: var(--text-secondary);
    margin-bottom: 2rem;
    line-height: 1.8;
}

.cta-button {
    background-color: var(--primary);
    color: white;
    border: none;
    padding: 1rem 2rem;
    font-size: 1.125rem;
    border-radius: 0.5rem;
    cursor: pointer;
    font-weight: 500;
    transition: all 0.3s ease;
}

.cta-button:hover {
    background-color: var(--primary-dark);
    transform: translateY(-2px);
}

.hero-image {
    height: 320px;
    border-radius: 1rem;
    background: linear-gradient(135deg, var(--primary-light), var(--primary));
    display: flex;
    align-items: center;
    justify-content: center;
    font-size: 5rem;
}

/* Grid Layouts */
.features-grid,
.info-grid,
.games-grid,
.about-grid,
.tracker-cards,
.settings-grid,
.rewards-grid {
    display: grid;
    grid-template-columns: repeat(auto-fit, minmax(300px, 1fr));
    gap: 2rem;
}

.metrics-grid {
    display: grid;
    grid-template-columns: repeat(auto-fit, minmax(200px, 1fr));
    gap: 2rem;
    margin-bottom: 2rem;
}

/* Cards */
.feature-card,
.info-card,
.game-card,
.about-card,
.tracker-card,
.settings-card,
.metric-card,
.reward-card {
    background-color: var(--surface);
    border: 1px solid var(--border);
    border-radius: 0.5rem;
    padding: 2rem;
    box-shadow: 0 4px 6px var(--shadow);
    transition: all 0.3s ease;
}

.feature-card:hover,
.info-card:hover,
.game-card:hover,
.about-card:hover,
.tracker-card:hover,
.settings-card:hover,
.reward-card:hover {
    box-shadow: 0 8px 16px var(--shadow);
    transform: translateY(-4px);
}

.reward-card.earned {
    border-color: gold;
    box-shadow: 0 0 15px gold;
}

.feature-icon,
.info-icon,
.game-icon,
.about-icon,
.tracker-icon,
.settings-icon,
.reward-icon {
    font-size: 3rem;
    margin-bottom: 1rem;
    display: block;
}

.feature-card h3,
.info-card h3,
.game-card h3,
.about-card h3,
.tracker-card h3,
.settings-card h3,
.reward-card h3 {
    color: var(--primary);
    font-size: 1.25rem;
    margin-bottom: 1rem;
}

.feature-card p,
.info-card p,
.game-card p,
.about-card p,
.tracker-card p,
.settings-card p,
.reward-card p {
    color: var(--text-secondary);
    line-height: 1.7;
}

/* Buttons */
.game-button,
.tracker-button,
.settings-button,
.calculate-button {
    background-color: var(--primary);
    color: white;
    border: none;
    padding: 0.75rem 1.5rem;
    border-radius: 0.5rem;
    cursor: pointer;
    font-weight: 500;
    margin-top: 1rem;
    transition: all 0.3s ease;
}

.game-button:hover,
.tracker-button:hover,
.settings-button:hover,
.calculate-button:hover {
    background-color: var(--primary-dark);
}

/* Metric Cards */
.metric-card {
    text-align: center;
    padding: 2rem;
}

.metric-value {
    font-size: 2.5rem;
    font-weight: bold;
    color: var(--primary);
    margin-bottom: 0.5rem;
}

.metric-label {
    color: var(--text-secondary);
    font-size: 0.875rem;
    text-transform: uppercase;
    letter-spacing: 0.05em;
}

/* Theme Selection */
.theme-options {
    display: flex;
    gap: 1rem;
    margin: 1rem 0;
    flex-wrap: wrap;
}

.theme-option {
    width: 60px;
    height: 60px;
    border-radius: 50%;
    cursor: pointer;
    border: 3px solid transparent;
    transition: all 0.3s ease;
    position: relative;
    display: flex;
    flex-direction: column;
    align-items: center;
    justify-content: center;
}

.theme-option:hover {
    transform: scale(1.1);
}

.theme-option.active {
    border-color: var(--primary);
    box-shadow: 0 0 0 2px var(--primary);
}

.light-theme {
    background: linear-gradient(135deg, #fbfdf8, #2d7d4a);
}

.dark-theme {
    background: linear-gradient(135deg, #0f172a, #43a862);
}

.forest-theme {
    background: linear-gradient(135deg, #f0f4f0, #16a34a);
}

.ocean-theme {
    background: linear-gradient(135deg, #f0f9ff, #0891b2);
}

.sunset-theme {
    background: linear-gradient(135deg, #fef7f0, #dc2626);
}

.theme-name {
    font-size: 0.75rem;
    font-weight: 500;
    color: var(--text-primary);
    margin-top: 0.5rem;
    text-align: center;
}

/* Language Selection */
.language-options {
    display: flex;
    gap: 1rem;
    margin: 1rem 0;
    flex-wrap: wrap;
}

.language-option {
    flex: 1;
    min-width: 200px;
    display: flex;
    align-items: center;
    gap: 1rem;
    padding: 1rem;
    border: 2px solid var(--border);
    border-radius: 0.5rem;
    background: var(--surface);
    cursor: pointer;
    transition: all 0.3s ease;
}

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

.language-option.active {
    background: var(--primary);
    color: white;
    border-color: var(--primary);
}

.language-option.active .language-name,
.language-option.active .language-region {
    color: white;
}

.flag {
    font-size: 2rem;
}

.language-info {
    flex: 1;
}

.language-name {
    font-weight: 600;
    font-size: 1.125rem;
    margin-bottom: 0.25rem;
}

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

/* Notification */
.notification {
    position: fixed;
    top: 2rem;
    right: -100%;
    background-color: var(--primary);
    color: white;
    padding: 1.5rem;
    border-radius: 0.5rem;
    box-shadow: 0 8px 16px var(--shadow);
    z-index: 1000;
    transition: right 0.3s ease;
    max-width: 300px;
}

.notification.show {
    right: 2rem;
}

/* Responsive Design */
@media (max-width: 768px) {
    .nav-menu {
        gap: 0.5rem;
    }
    
    .nav-menu li a {
        padding: 0.5rem;
        font-size: 0.875rem;
    }
    
    .nav-text {
        display: none;
    }
    
    .hero {
        grid-template-columns: 1fr;
        gap: 2rem;
        text-align: center;
    }
    
    .hero-content h1 {
        font-size: 2rem;
    }
    
    .section-header h2 {
        font-size: 2rem;
    }
    
    .features-grid,
    .info-grid,
    .games-grid,
    .about-grid,
    .tracker-cards,
    .settings-grid,
    .rewards-grid {
        grid-template-columns: 1fr;
    }
    
    .metrics-grid {
        grid-template-columns: repeat(2, 1fr);
    }
    
    .section {
        padding: 1rem;
    }
    
    .nav-container {
        padding: 0 1rem;
    }
    
    .theme-options,
    .language-options {
        flex-direction: column;
    }
    
    .language-option {
        min-width: auto;
    }
}

@media (max-width: 640px) {
    .nav-menu {
        gap: 0.25rem;
    }
    
    .nav-menu li a {
        padding: 0.25rem;
        font-size: 1.25rem;
    }
}

@media (max-width: 480px) {
    .metrics-grid {
        grid-template-columns: 1fr;
    }
    
    .hero-image {
        height: 200px;
        font-size: 3rem;
    }
    
    .feature-icon,
    .info-icon,
    .game-icon,
    .about-icon,
    .tracker-icon,
    .settings-icon {
        font-size: 2.5rem;
    }
}

/* Scrollbar styling */
::-webkit-scrollbar {
    display: none;
}

::-webkit-scrollbar-track {
    background: transparent;
}

::-webkit-scrollbar-thumb {
    background-color: var(--border);
    border-radius: 3px;
}

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

/* Smooth transitions for theme changes */
* {
    transition: background-color 0.3s ease, color 0.3s ease, border-color 0.3s ease;
}

/* Waste Categories */
.waste-categories {
    margin: 2rem 0;
}

.waste-categories h3 {
    text-align: center;
    margin-bottom: 1.5rem;
    color: var(--primary);
    font-size: 1.5rem;
}

.category-grid {
    display: grid;
    grid-template-columns: repeat(auto-fit, minmax(200px, 1fr));
    gap: 1rem;
    margin-bottom: 1rem;
}

.category-card {
    background-color: var(--surface);
    border: 1px solid var(--border);
    border-radius: 0.5rem;
    padding: 1.5rem;
    text-align: center;
    transition: all 0.3s ease;
}

.category-card:hover {
    transform: translateY(-2px);
    box-shadow: 0 4px 8px var(--shadow);
}

.category-icon {
    font-size: 2.5rem;
    margin-bottom: 0.5rem;
    display: block;
}

.category-name {
    font-weight: 600;
    color: var(--primary);
    margin-bottom: 0.5rem;
}

.category-value {
    font-size: 1.25rem;
    font-weight: bold;
    color: var(--text-primary);
}

.live-indicator {
    display: flex;
    align-items: center;
    justify-content: center;
    gap: 0.5rem;
    margin-top: 1rem;
    color: var(--text-secondary);
    font-size: 0.875rem;
}

.pulse-dot {
    width: 8px;
    height: 8px;
    background-color: var(--primary);
    border-radius: 50%;
    animation: pulse 2s infinite;
}

@keyframes pulse {
    0% {
        opacity: 1;
        transform: scale(1);
    }
    50% {
        opacity: 0.5;
        transform: scale(1.2);
    }
    100% {
        opacity: 1;
        transform: scale(1);
    }
}

/* Hamburger Menu Styles */
.hamburger {
    display: none;
    flex-direction: column;
    justify-content: space-around;
    width: 30px;
    height: 25px;
    background: transparent;
    border: none;
    cursor: pointer;
    padding: 0;
    z-index: 10;
}

.hamburger span {
    width: 30px;
    height: 3px;
    background: var(--primary);
    border-radius: 2px;
    transition: all 0.3s ease;
}

.hamburger.active span:nth-child(1) {
    transform: rotate(45deg) translate(5px, 5px);
}

.hamburger.active span:nth-child(2) {
    opacity: 0;
}

.hamburger.active span:nth-child(3) {
    transform: rotate(-45deg) translate(7px, -6px);
}

/* Mobile Navigation */
@media (max-width: 768px) {
    .hamburger {
        display: flex;
    }
    
    .nav-menu {
        position: fixed;
        left: -100%;
        top: 64px;
        flex-direction: column;
        background-color: var(--surface);
        width: 100%;
        text-align: center;
        transition: 0.3s;
        box-shadow: 0 10px 27px var(--shadow);
        padding: 2rem 0;
        gap: 0;
    }
    
    .nav-menu.active {
        left: 0;
    }
    
    .nav-menu li {
        margin: 1rem 0;
    }
    
    .nav-menu li a {
        font-size: 1.2rem;
        padding: 1rem;
        width: 100%;
        display: flex;
        justify-content: center;
        align-items: center;
    }
}

/* Eco Bot Container */
.eco-bot-container {
    position: fixed;
    bottom: 30px;
    right: 30px;
    z-index: 1000;
    pointer-events: none;
}

.eco-bot {
    position: relative;
    width: 120px;
    height: 140px;
    cursor: pointer;
    pointer-events: auto;
    transform-style: preserve-3d;
    transition: transform 0.3s ease;
    animation: ecoBotFloat 3s ease-in-out infinite;
}

@keyframes ecoBotFloat {
    0%, 100% { transform: translateY(0px) rotateY(0deg); }
    50% { transform: translateY(-10px) rotateY(5deg); }
}

.eco-bot:hover {
    transform: scale(1.1) rotateY(10deg);
}

/* Robot Body - Wall-E Inspired Design */
.robot-body {
    position: relative;
    width: 100%;
    height: 100%;
    transform-style: preserve-3d;
}

.robot-head {
    position: absolute;
    top: 0;
    left: 50%;
    transform: translateX(-50%);
    width: 80px;
    height: 60px;
    background: linear-gradient(135deg, #4a5568, #2d3748);
    border-radius: 15px 15px 10px 10px;
    box-shadow: 
        0 4px 8px rgba(0,0,0,0.3),
        inset 0 2px 4px rgba(255,255,255,0.1);
    border: 2px solid #1a202c;
}

.robot-eyes {
    position: absolute;
    top: 15px;
    left: 50%;
    transform: translateX(-50%);
    display: flex;
    gap: 20px;
}

.eye {
    width: 18px;
    height: 18px;
    background: radial-gradient(circle at 30% 30%, #60a5fa, #3b82f6);
    border-radius: 50%;
    border: 2px solid #1e40af;
    box-shadow: 
        inset 0 2px 4px rgba(0,0,0,0.3),
        0 0 10px rgba(96, 165, 250, 0.5);
    animation: eyeBlink 4s infinite;
}

@keyframes eyeBlink {
    0%, 90%, 100% { transform: scaleY(1); }
    95% { transform: scaleY(0.1); }
}

.robot-antenna {
    position: absolute;
    top: -15px;
    left: 50%;
    transform: translateX(-50%);
    width: 3px;
    height: 15px;
    background: #4b5563;
    border-radius: 2px;
}

.robot-antenna::before {
    content: "";
    position: absolute;
    top: -5px;
    left: 50%;
    transform: translateX(-50%);
    width: 8px;
    height: 8px;
    background: #ef4444;
    border-radius: 50%;
    box-shadow: 0 0 8px rgba(239, 68, 68, 0.6);
    animation: antennaPulse 2s infinite;
}

@keyframes antennaPulse {
    0%, 100% { opacity: 1; }
    50% { opacity: 0.6; }
}

.robot-chest {
    position: absolute;
    top: 55px;
    left: 50%;
    transform: translateX(-50%);
    width: 90px;
    height: 70px;
    background: linear-gradient(135deg, #374151, #1f2937);
    border-radius: 8px;
    box-shadow: 
        0 4px 8px rgba(0,0,0,0.3),
        inset 0 2px 4px rgba(255,255,255,0.05);
    border: 2px solid #111827;
}

.robot-panel {
    position: absolute;
    top: 15px;
    left: 50%;
    transform: translateX(-50%);
    width: 60px;
    height: 40px;
    background: linear-gradient(135deg, #1f2937, #111827);
    border-radius: 4px;
    border: 1px solid #374151;
    display: flex;
    align-items: center;
    justify-content: center;
    gap: 8px;
}

.robot-panel::before,
.robot-panel::after {
    content: "";
    width: 8px;
    height: 8px;
    border-radius: 50%;
    background: #10b981;
    box-shadow: 0 0 6px rgba(16, 185, 129, 0.7);
    animation: panelLight 3s infinite;
}

.robot-panel::after {
    background: #f59e0b;
    box-shadow: 0 0 6px rgba(245, 158, 11, 0.7);
    animation-delay: 1.5s;
}

@keyframes panelLight {
    0%, 100% { opacity: 1; }
    50% { opacity: 0.3; }
}

.robot-wheels {
    position: absolute;
    bottom: 0;
    left: 50%;
    transform: translateX(-50%);
    width: 100px;
    height: 25px;
    display: flex;
    justify-content: space-between;
    align-items: center;
}

.wheel {
    width: 25px;
    height: 25px;
    background: radial-gradient(circle at 30% 30%, #6b7280, #374151);
    border-radius: 50%;
    border: 2px solid #1f2937;
    box-shadow: 
        0 2px 4px rgba(0,0,0,0.4),
        inset 0 2px 4px rgba(255,255,255,0.1);
    position: relative;
}

.wheel::before {
    content: "";
    position: absolute;
    top: 50%;
    left: 50%;
    transform: translate(-50%, -50%);
    width: 8px;
    height: 8px;
    background: #1f2937;
    border-radius: 50%;
}

/* Chat Bubble */
.chat-bubble {
    position: absolute;
    bottom: 150px;
    right: 0;
    width: 280px;
    background: var(--surface);
    border: 2px solid var(--primary);
    border-radius: 15px;
    padding: 1rem;
    box-shadow: 0 8px 16px var(--shadow);
    opacity: 0;
    visibility: hidden;
    transform: translateY(10px);
    transition: all 0.3s ease;
}

.chat-bubble.show {
    opacity: 1;
    visibility: visible;
    transform: translateY(0);
}

.chat-content h4 {
    color: var(--primary);
    margin-bottom: 0.5rem;
    font-size: 1.1rem;
}

.chat-content p {
    color: var(--text-secondary);
    font-size: 0.9rem;
    line-height: 1.4;
}

.chat-arrow {
    position: absolute;
    bottom: -10px;
    right: 30px;
    width: 0;
    height: 0;
    border-left: 10px solid transparent;
    border-right: 10px solid transparent;
    border-top: 10px solid var(--primary);
}

/* Waste Disposal Information */
.waste-info {
    margin-top: 0.5rem;
    padding-top: 0.5rem;
    border-top: 1px solid var(--border);
}

.waste-info h5 {
    color: var(--primary);
    font-size: 0.8rem;
    margin-bottom: 0.3rem;
}

.waste-info ul {
    list-style: none;
    padding: 0;
    margin: 0;
}

.waste-info li {
    color: var(--text-secondary);
    font-size: 0.8rem;
    margin-bottom: 0.2rem;
    padding-left: 1rem;
    position: relative;
}

.waste-info li::before {
    content: "♻️";
    position: absolute;
    left: 0;
}

/* Responsive Eco Bot */
@media (max-width: 768px) {
    .eco-bot-container {
        bottom: 20px;
        right: 20px;
    }
    
    .eco-bot {
        width: 100px;
        height: 120px;
    }
    
    .robot-head {
        width: 70px;
        height: 50px;
    }
    
    .robot-chest {
        width: 80px;
        height: 60px;
    }
    
    .chat-bubble {
        width: 250px;
        bottom: 130px;
        right: -20px;
    }
}

@media (max-width: 480px) {
    .eco-bot-container {
        bottom: 15px;
        right: 15px;
    }
    
    .eco-bot {
        width: 80px;
        height: 100px;
    }
    
    .robot-head {
        width: 60px;
        height: 45px;
    }
    
    .robot-chest {
        width: 70px;
        height: 50px;
    }
    
    .chat-bubble {
        width: 200px;
        bottom: 110px;
        right: -30px;
    }
    
    .chat-content h4 {
        font-size: 1rem;
    }
    
    .chat-content p {
        font-size: 0.8rem;
    }
}

/* Games Section Styles */
#game-container {
    margin-top: 2rem;
}

.game-content {
    display: none;
    background-color: var(--surface);
    border: 1px solid var(--border);
    border-radius: 0.5rem;
    padding: 2rem;
    box-shadow: 0 4px 6px var(--shadow);
    animation: fadeInUp 0.5s ease;
}

.game-content h3 {
    color: var(--primary);
    text-align: center;
    margin-bottom: 1rem;
}

.difficulty-selector {
    display: flex;
    justify-content: center;
    align-items: center;
    gap: 1rem;
    margin-bottom: 1rem;
}

.difficulty-selector label {
    font-weight: bold;
    color: var(--text-primary);
}

.difficulty-selector select {
    padding: 0.5rem;
    border-radius: 0.5rem;
    border: 1px solid var(--border);
    background-color: var(--background);
    color: var(--text-primary);
}

.timer-display {
    text-align: center;
    font-size: 1.2rem;
    font-weight: bold;
    color: var(--primary);
    margin-bottom: 1rem;
}

.game-info {
    text-align: center;
    margin-bottom: 1.5rem;
    color: var(--text-secondary);
}

.points-display {
    font-size: 1.2rem;
    font-weight: bold;
    color: var(--primary);
    margin-top: 1rem;
}

.reset-button {
    background-color: var(--accent);
    color: white;
    border: none;
    padding: 0.75rem 1.5rem;
    border-radius: 0.5rem;
    cursor: pointer;
    font-weight: 500;
    margin-top: 1rem;
    transition: all 0.3s ease;
    display: block;
    margin: 1.5rem auto 0;
}

.reset-button:hover {
    background-color: #1a7ab0;
    transform: translateY(-2px);
}

/* Sorting Game Styles */
.bins-container {
    display: grid;
    grid-template-columns: repeat(auto-fit, minmax(200px, 1fr));
    gap: 1rem;
    margin-bottom: 2rem;
}

.bin {
    background-color: var(--background);
    border: 2px dashed var(--border);
    border-radius: 0.5rem;
    padding: 1rem;
    text-align: center;
    min-height: 100px;
    display: flex;
    flex-direction: column;
    justify-content: center;
    align-items: center;
    transition: all 0.3s ease;
}

.bin h4 {
    color: var(--primary);
    margin-bottom: 0.5rem;
}

.bin.drag-over {
    border: 2px solid var(--primary);
    background-color: rgba(45, 125, 74, 0.1);
}

.items-container {
    display: grid;
    grid-template-columns: repeat(auto-fit, minmax(120px, 1fr));
    gap: 1rem;
    margin-bottom: 1rem;
}

.waste-item {
    background-color: var(--surface);
    border: 1px solid var(--border);
    border-radius: 0.5rem;
    padding: 1rem;
    text-align: center;
    cursor: move;
    transition: all 0.3s ease;
    box-shadow: 0 2px 4px var(--shadow);
}

.waste-item:hover {
    transform: translateY(-4px);
    box-shadow: 0 8px 16px var(--shadow);
}

.waste-icon {
    font-size: 2rem;
    display: block;
    margin-bottom: 0.5rem;
}

.waste-name {
    font-size: 0.9rem;
    color: var(--text-primary);
}

.waste-item.dragging {
    opacity: 0.5;
}

/* Matching Game Styles */
.matching-board {
    display: grid;
    grid-template-columns: repeat(4, 1fr);
    gap: 1rem;
    margin-bottom: 1rem;
}

.matching-card {
    aspect-ratio: 1;
    background-color: var(--surface);
    border: 1px solid var(--border);
    border-radius: 0.5rem;
    cursor: pointer;
    transition: all 0.3s ease;
    box-shadow: 0 2px 4px var(--shadow);
    perspective: 1000px;
    position: relative;
}

.matching-card:hover {
    transform: translateY(-4px);
    box-shadow: 0 8px 16px var(--shadow);
}

.matching-card.flipped {
    transform: rotateY(180deg);
}

.matching-card.matched {
    opacity: 0.7;
    cursor: default;
}

.matching-card .card-front,
.matching-card .card-back {
    position: absolute;
    width: 100%;
    height: 100%;
    backface-visibility: hidden;
    display: flex;
    flex-direction: column;
    justify-content: center;
    align-items: center;
    border-radius: 0.5rem;
}

.matching-card .card-front {
    background-color: var(--primary);
    color: white;
    transform: rotateY(180deg);
}

.matching-card .card-back {
    background-color: var(--background);
    color: var(--text-primary);
}

.matching-card .card-front span,
.matching-card .card-back span {
    font-size: 2rem;
}

/* Memory Game Styles */
.memory-board {
    display: grid;
    grid-template-columns: repeat(4, 1fr);
    gap: 1rem;
    margin-bottom: 1rem;
}

.memory-card {
    aspect-ratio: 1;
    background-color: var(--surface);
    border: 1px solid var(--border);
    border-radius: 0.5rem;
    cursor: pointer;
    transition: all 0.3s ease;
    box-shadow: 0 2px 4px var(--shadow);
    perspective: 1000px;
    position: relative;
}

.memory-card:hover {
    transform: translateY(-4px);
    box-shadow: 0 8px 16px var(--shadow);
}

.memory-card.flipped {
    transform: rotateY(180deg);
}

.memory-card.matched {
    opacity: 0.7;
    cursor: default;
}

.memory-card .card-front,
.memory-card .card-back {
    position: absolute;
    width: 100%;
    height: 100%;
    backface-visibility: hidden;
    display: flex;
    flex-direction: column;
    justify-content: center;
    align-items: center;
    border-radius: 0.5rem;
}

.memory-card .card-front {
    background-color: var(--primary);
    color: white;
    transform: rotateY(180deg);
}

.memory-card .card-back {
    background-color: var(--background);
    color: var(--text-primary);
}

.memory-card .card-front span,
.memory-card .card-back span {
    font-size: 2rem;
}

/* Responsive Game Board */
@media (max-width: 768px) {
    .matching-board,
    .memory-board {
        grid-template-columns: repeat(3, 1fr);
    }
}

@media (max-width: 480px) {
    .matching-board,
    .memory-board {
        grid-template-columns: repeat(2, 1fr);
    }
    
    .bins-container {
        grid-template-columns: repeat(2, 1fr);
    }
}

/* Waste Disposal Calculator Styles */
.calculator-container {
    display: grid;
    grid-template-columns: repeat(auto-fit, minmax(300px, 1fr));
    gap: 2rem;
    margin-bottom: 2rem;
}

.calculator-card {
    background-color: var(--surface);
    border: 1px solid var(--border);
    border-radius: 0.5rem;
    padding: 2rem;
    box-shadow: 0 4px 6px var(--shadow);
    transition: all 0.3s ease;
}

.calculator-card:hover {
    box-shadow: 0 8px 16px var(--shadow);
    transform: translateY(-4px);
}

.calculator-card h3 {
    color: var(--primary);
    font-size: 1.5rem;
    margin-bottom: 1.5rem;
    text-align: center;
}

.calculator-inputs {
    margin-bottom: 1.5rem;
}

.input-group {
    margin-bottom: 1rem;
}

.input-group label {
    display: block;
    margin-bottom: 0.5rem;
    color: var(--text-primary);
    font-weight: 500;
}

.input-group input,
.input-group select {
    width: 100%;
    padding: 0.75rem;
    border-radius: 0.5rem;
    border: 1px solid var(--border);
    background-color: var(--background);
    color: var(--text-primary);
    font-size: 1rem;
}

.calculator-results {
    background-color: rgba(45, 125, 74, 0.1);
    border-radius: 0.5rem;
    padding: 1.5rem;
    margin-top: 1rem;
}

.calculator-results h4 {
    color: var(--primary);
    margin-bottom: 1rem;
    text-align: center;
}

.result-item {
    display: flex;
    justify-content: space-between;
    margin-bottom: 0.75rem;
    padding: 0.5rem 0;
    border-bottom: 1px solid var(--border);
}

.result-item:last-child {
    border-bottom: none;
}

.result-item span:first-child {
    color: var(--text-primary);
    font-weight: 500;
}

.result-item span:last-child {
    color: var(--primary);
    font-weight: bold;
}

.calculate-button {
    width: 100%;
    padding: 1rem;
    font-size: 1.1rem;
    margin-top: 1rem;
}

/* Task Tracker Styles */
.task-tracker {
    margin-top: 1.5rem;
}

.task-tracker h4 {
    color: var(--primary);
    margin-bottom: 1rem;
}

.task-list {
    list-style: none;
    padding: 0;
    margin: 0;
}

.task-item {
    display: flex;
    align-items: center;
    margin-bottom: 1rem;
    padding: 0.75rem;
    background-color: var(--background);
    border-radius: 0.5rem;
    transition: all 0.3s ease;
}

.task-item:hover {
    background-color: rgba(45, 125, 74, 0.1);
}

.task-item input[type="checkbox"] {
    margin-right: 1rem;
    width: 1.25rem;
    height: 1.25rem;
    cursor: pointer;
}

.task-item label {
    color: var(--text-primary);
    cursor: pointer;
    flex: 1;
}
/* ===================================
   AUDIO CONTROLS STYLING
   =================================== */

.audio-controls {
    display: flex;
    flex-direction: column;
    gap: 1.5rem;
    margin-top: 1rem;
}

.control-group {
    display: flex;
    flex-direction: column;
    gap: 0.75rem;
}

.control-label {
    display: flex;
    flex-direction: column;
    gap: 0.25rem;
}

.control-label span {
    font-weight: 600;
    color: var(--text-primary);
    font-size: 0.95rem;
}

.control-label small {
    color: var(--text-secondary);
    font-size: 0.85rem;
}

/* Toggle Switch */
.toggle-switch {
    position: relative;
    display: inline-block;
    width: 52px;
    height: 28px;
    cursor: pointer;
}

.toggle-switch input {
    opacity: 0;
    width: 0;
    height: 0;
}

.toggle-slider {
    position: absolute;
    cursor: pointer;
    top: 0;
    left: 0;
    right: 0;
    bottom: 0;
    background-color: #ccc;
    transition: 0.3s;
    border-radius: 28px;
}

.toggle-slider:before {
    position: absolute;
    content: "";
    height: 20px;
    width: 20px;
    left: 4px;
    bottom: 4px;
    background-color: white;
    transition: 0.3s;
    border-radius: 50%;
}

.toggle-switch input:checked + .toggle-slider {
    background-color: var(--primary);
}

.toggle-switch input:checked + .toggle-slider:before {
    transform: translateX(24px);
}

/* Volume Control */
.volume-control {
    display: flex;
    align-items: center;
    gap: 1rem;
}

#volume-slider {
    flex: 1;
    height: 6px;
    border-radius: 3px;
    background: linear-gradient(to right, var(--primary) 0%, var(--primary) 70%, #ddd 70%, #ddd 100%);
    outline: none;
}

#volume-slider::-webkit-slider-thumb {
    -webkit-appearance: none;
    appearance: none;
    width: 18px;
    height: 18px;
    border-radius: 50%;
    background: var(--primary);
    cursor: pointer;
    box-shadow: 0 2px 4px rgba(0,0,0,0.2);
    transition: all 0.2s;
}

#volume-slider::-webkit-slider-thumb:hover {
    transform: scale(1.2);
    box-shadow: 0 3px 6px rgba(0,0,0,0.3);
}

#volume-slider::-moz-range-thumb {
    width: 18px;
    height: 18px;
    border-radius: 50%;
    background: var(--primary);
    cursor: pointer;
    border: none;
    box-shadow: 0 2px 4px rgba(0,0,0,0.2);
    transition: all 0.2s;
}

#volume-slider::-moz-range-thumb:hover {
    transform: scale(1.2);
    box-shadow: 0 3px 6px rgba(0,0,0,0.3);
}

#volume-value {
    min-width: 45px;
    text-align: right;
    font-weight: 600;
    color: var(--primary);
    font-size: 0.9rem;
}

/* Test Audio Button */
.test-audio-btn {
    display: flex;
    align-items: center;
    justify-content: center;
    gap: 0.5rem;
    padding: 0.75rem 1.5rem;
    background: linear-gradient(135deg, var(--primary) 0%, var(--primary-light) 100%);
    color: white;
    border: none;
    border-radius: 8px;
    font-weight: 600;
    cursor: pointer;
    transition: all 0.3s ease;
    box-shadow: 0 2px 8px var(--shadow);
}

.test-audio-btn:hover {
    transform: translateY(-2px);
    box-shadow: 0 4px 12px var(--shadow);
}

.test-audio-btn:active {
    transform: translateY(0);
}

.test-audio-btn svg {
    width: 16px;
    height: 16px;
}

/* ===================================
   ENHANCED CALCULATOR STYLING
   =================================== */

.calculator-container {
    display: grid;
    grid-template-columns: 1fr;
    gap: 2rem;
    max-width: 1200px;
    margin: 0 auto;
}

.calculator-card {
    background: linear-gradient(135deg, #ffffff 0%, #f8f9fa 100%);
    border-radius: 16px;
    padding: 2.5rem;
    box-shadow: 0 8px 24px rgba(0, 0, 0, 0.08);
    border: 1px solid var(--border);
    transition: all 0.3s ease;
}

.calculator-card:hover {
    box-shadow: 0 12px 32px rgba(0, 0, 0, 0.12);
    transform: translateY(-2px);
}

.calculator-card h3 {
    font-size: 1.75rem;
    color: var(--primary);
    margin-bottom: 1.5rem;
    font-weight: 700;
    text-align: center;
}

.calculator-inputs {
    display: flex;
    flex-direction: column;
    gap: 1.5rem;
    margin-bottom: 2rem;
}

.input-group {
    display: flex;
    flex-direction: column;
    gap: 0.5rem;
}

.input-group label {
    font-weight: 600;
    color: var(--text-primary);
    font-size: 0.95rem;
}

.input-group input,
.input-group select {
    padding: 0.875rem 1rem;
    border: 2px solid var(--border);
    border-radius: 10px;
    font-size: 1rem;
    transition: all 0.3s ease;
    background: white;
    color: var(--text-primary);
}

.input-group input:focus,
.input-group select:focus {
    outline: none;
    border-color: var(--primary);
    box-shadow: 0 0 0 3px rgba(45, 125, 74, 0.1);
}

.input-group select {
    cursor: pointer;
    appearance: none;
    background-image: url("data:image/svg+xml,%3Csvg xmlns='http://www.w3.org/2000/svg' width='12' height='12' viewBox='0 0 12 12'%3E%3Cpath fill='%232d7d4a' d='M6 9L1 4h10z'/%3E%3C/svg%3E");
    background-repeat: no-repeat;
    background-position: right 1rem center;
    padding-right: 2.5rem;
}

.calculator-results {
    background: linear-gradient(135deg, #f0f9ff 0%, #e0f2fe 100%);
    border-radius: 12px;
    padding: 1.5rem;
    margin-bottom: 1.5rem;
    border: 2px solid var(--primary);
}

.calculator-results h4 {
    font-size: 1.25rem;
    color: var(--primary);
    margin-bottom: 1rem;
    font-weight: 700;
    text-align: center;
}

.result-item {
    display: flex;
    justify-content: space-between;
    align-items: center;
    padding: 0.75rem 1rem;
    background: white;
    border-radius: 8px;
    margin-bottom: 0.75rem;
    transition: all 0.2s ease;
}

.result-item:last-child {
    margin-bottom: 0;
}

.result-item:hover {
    transform: translateX(4px);
    box-shadow: 0 2px 8px rgba(0, 0, 0, 0.08);
}

.result-item span:first-child {
    font-weight: 600;
    color: var(--text-secondary);
}

.result-item span:last-child {
    font-weight: 700;
    color: var(--primary);
    font-size: 1.1rem;
}

.result-item.category-info {
    background: linear-gradient(135deg, #fef3c7 0%, #fde68a 100%);
    border: 1px solid #fbbf24;
}

.result-item.category-info span:last-child {
    color: #92400e;
}

.calculate-button {
    width: 100%;
    padding: 1rem 2rem;
    background: linear-gradient(135deg, var(--primary) 0%, var(--primary-light) 100%);
    color: white;
    border: none;
    border-radius: 12px;
    font-size: 1.1rem;
    font-weight: 700;
    cursor: pointer;
    transition: all 0.3s ease;
    box-shadow: 0 4px 12px rgba(45, 125, 74, 0.3);
    text-transform: uppercase;
    letter-spacing: 0.5px;
}

.calculate-button:hover {
    transform: translateY(-2px);
    box-shadow: 0 6px 16px rgba(45, 125, 74, 0.4);
}

.calculate-button:active {
    transform: translateY(0);
}

/* Responsive Design */
@media (max-width: 768px) {
    .calculator-card {
        padding: 1.5rem;
    }
    
    .calculator-card h3 {
        font-size: 1.5rem;
    }
    
    .audio-controls {
        gap: 1rem;
    }
    
    .control-group {
        gap: 0.5rem;
    }
}
/* Kids Friendly Colorful Game Cards */
.colorful-card {
    background: linear-gradient(135deg, var(--rainbow-red), var(--rainbow-orange), var(--rainbow-yellow));
    border: 3px solid var(--rainbow-purple);
    border-radius: 1rem;
    padding: 2rem;
    box-shadow: 0 8px 16px rgba(255, 107, 107, 0.3);
    transition: all 0.3s ease;
    position: relative;
    overflow: hidden;
}

.colorful-card::before {
    content: "";
    position: absolute;
    top: -50%;
    left: -50%;
    width: 200%;
    height: 200%;
    background: linear-gradient(45deg, 
        var(--rainbow-pink), 
        var(--rainbow-purple), 
        var(--rainbow-blue), 
        var(--rainbow-green), 
        var(--rainbow-yellow), 
        var(--rainbow-orange), 
        var(--rainbow-red));
    opacity: 0.1;
    animation: rainbow-shimmer 3s ease-in-out infinite;
    z-index: 0;
}

.colorful-card > * {
    position: relative;
    z-index: 1;
}

.colorful-card:hover {
    transform: translateY(-8px) scale(1.02);
    box-shadow: 0 12px 24px rgba(255, 107, 107, 0.4);
    background: linear-gradient(135deg, var(--rainbow-green), var(--rainbow-blue), var(--rainbow-purple));
}

.sorting-game {
    background: linear-gradient(135deg, var(--rainbow-green), var(--rainbow-blue));
}

.matching-game {
    background: linear-gradient(135deg, var(--rainbow-orange), var(--rainbow-red));
}

.spelling-game {
    background: linear-gradient(135deg, var(--rainbow-purple), var(--rainbow-pink));
}

.puzzle-game {
    background: linear-gradient(135deg, var(--rainbow-blue), var(--rainbow-green));
}

.memory-game {
    background: linear-gradient(135deg, var(--rainbow-yellow), var(--rainbow-orange));
}

/* Rainbow Button */
.rainbow-btn {
    background: linear-gradient(45deg, 
        var(--rainbow-red), 
        var(--rainbow-orange), 
        var(--rainbow-yellow), 
        var(--rainbow-green), 
        var(--rainbow-blue), 
        var(--rainbow-purple), 
        var(--rainbow-pink));
    border: none;
    border-radius: 2rem;
    padding: 1rem 2rem;
    color: white;
    font-weight: bold;
    font-size: 1.1rem;
    cursor: pointer;
    transition: all 0.3s ease;
    text-shadow: 2px 2px 4px rgba(0, 0, 0, 0.3);
    box-shadow: 0 4px 8px rgba(0, 0, 0, 0.2);
}

.rainbow-btn:hover {
    transform: scale(1.1);
    box-shadow: 0 6px 12px rgba(0, 0, 0, 0.3);
    background: linear-gradient(-45deg, 
        var(--rainbow-pink), 
        var(--rainbow-purple), 
        var(--rainbow-blue), 
        var(--rainbow-green), 
        var(--rainbow-yellow), 
        var(--rainbow-orange), 
        var(--rainbow-red));
}

/* Game Stats */
.game-stats {
    display: flex;
    justify-content: space-between;
    margin: 1rem 0;
    padding: 0.5rem;
    background: rgba(255, 255, 255, 0.3);
    border-radius: 1rem;
    backdrop-filter: blur(5px);
}

.game-stats span {
    background: rgba(255, 255, 255, 0.5);
    padding: 0.3rem 0.8rem;
    border-radius: 1rem;
    font-size: 0.9rem;
    font-weight: bold;
    color: var(--text-primary);
}

/* Rainbow Animation */
@keyframes rainbow-shimmer {
    0% { transform: rotate(0deg); }
    100% { transform: rotate(360deg); }
}

/* Game Icons */
.game-icon {
    font-size: 3rem;
    display: block;
    text-align: center;
    margin-bottom: 1rem;
    animation: bounce 2s infinite;
}

@keyframes bounce {
    0%, 100% { transform: translateY(0); }
    50% { transform: translateY(-10px); }
}

/* Kids Game Styles */
.game-content {
    background: linear-gradient(135deg, #fff9e6, #ffe6f0, #e6f3ff);
    border-radius: 1.5rem;
    padding: 2rem;
    margin: 2rem auto;
    max-width: 1200px;
    box-shadow: 0 10px 30px rgba(0, 0, 0, 0.1);
}

.game-header h2 {
    color: var(--rainbow-purple);
    font-size: 2.5rem;
    text-align: center;
    margin-bottom: 1rem;
    text-shadow: 2px 2px 4px rgba(0, 0, 0, 0.1);
}

.game-info {
    text-align: center;
    margin-bottom: 2rem;
}

.game-info p {
    font-size: 1.2rem;
    color: var(--text-primary);
    margin-bottom: 1rem;
}

.game-stats {
    display: flex;
    justify-content: center;
    gap: 2rem;
    font-size: 1.1rem;
    font-weight: bold;
}

.game-stats span {
    background: linear-gradient(45deg, var(--rainbow-yellow), var(--rainbow-orange));
    padding: 0.5rem 1.5rem;
    border-radius: 2rem;
    color: white;
    box-shadow: 0 4px 8px rgba(0, 0, 0, 0.2);
}

/* Sorting Game Styles */
.sorting-area {
    display: flex;
    gap: 2rem;
    margin: 2rem 0;
}

.items-area {
    flex: 1;
    display: grid;
    grid-template-columns: repeat(auto-fit, minmax(120px, 1fr));
    gap: 1rem;
    padding: 1rem;
    background: rgba(255, 255, 255, 0.5);
    border-radius: 1rem;
    min-height: 300px;
}

.bins-area {
    flex: 1;
    display: flex;
    flex-direction: column;
    gap: 1rem;
}

.bin {
    background: linear-gradient(135deg, var(--rainbow-green), var(--rainbow-blue));
    border: 3px solid var(--rainbow-purple);
    border-radius: 1rem;
    padding: 1rem;
    min-height: 150px;
    transition: all 0.3s ease;
}

.bin.drag-over {
    transform: scale(1.05);
    box-shadow: 0 8px 16px rgba(0, 0, 0, 0.3);
}

.bin h3 {
    color: white;
    text-align: center;
    margin-bottom: 1rem;
    font-size: 1.3rem;
}

.waste-item {
    background: white;
    border: 2px solid var(--rainbow-purple);
    border-radius: 1rem;
    padding: 1rem;
    text-align: center;
    cursor: grab;
    transition: all 0.3s ease;
}

.waste-item:hover {
    transform: scale(1.1);
    box-shadow: 0 6px 12px rgba(0, 0, 0, 0.2);
}

.waste-item.dragging {
    opacity: 0.5;
    cursor: grabbing;
}

.item-emoji {
    font-size: 2rem;
    margin-bottom: 0.5rem;
}

.item-name {
    font-size: 0.9rem;
    font-weight: bold;
    color: var(--text-primary);
}

/* Matching Game Styles */
.matching-area {
    display: grid;
    grid-template-columns: repeat(auto-fit, minmax(200px, 1fr));
    gap: 1rem;
    margin: 2rem 0;
}

.matching-card {
    background: linear-gradient(135deg, var(--rainbow-pink), var(--rainbow-purple));
    border: 3px solid var(--rainbow-blue);
    border-radius: 1rem;
    padding: 1.5rem;
    text-align: center;
    cursor: pointer;
    transition: all 0.3s ease;
    color: white;
    font-weight: bold;
    font-size: 1.1rem;
}

.matching-card:hover {
    transform: scale(1.05);
    box-shadow: 0 6px 12px rgba(0, 0, 0, 0.3);
}

.matching-card.selected {
    background: linear-gradient(135deg, var(--rainbow-yellow), var(--rainbow-orange));
    transform: scale(1.1);
}

.matching-card.matched {
    background: linear-gradient(135deg, var(--rainbow-green), var(--rainbow-blue));
    animation: celebrate 0.5s ease;
}

@keyframes celebrate {
    0%, 100% { transform: scale(1) rotate(0deg); }
    25% { transform: scale(1.2) rotate(5deg); }
    75% { transform: scale(1.2) rotate(-5deg); }
}

/* Spelling Game Styles */
.spelling-area {
    text-align: center;
    margin: 2rem 0;
}

.word-display {
    margin-bottom: 2rem;
}

.hint {
    font-size: 1.2rem;
    color: var(--rainbow-purple);
    margin-bottom: 1rem;
}

.word-slots {
    display: flex;
    justify-content: center;
    gap: 0.5rem;
    margin: 1rem 0;
}

.letter-slot {
    width: 50px;
    height: 50px;
    border: 3px solid var(--rainbow-purple);
    border-radius: 0.5rem;
    display: flex;
    align-items: center;
    justify-content: center;
    font-size: 1.5rem;
    font-weight: bold;
    background: white;
    box-shadow: 0 2px 4px rgba(0, 0, 0, 0.1);
}

.letter-input-area {
    display: flex;
    flex-wrap: wrap;
    justify-content: center;
    gap: 0.5rem;
    margin: 2rem 0;
}

.letter-btn {
    width: 50px;
    height: 50px;
    border: 2px solid var(--rainbow-purple);
    border-radius: 0.5rem;
    background: linear-gradient(135deg, var(--rainbow-blue), var(--rainbow-green));
    color: white;
    font-size: 1.2rem;
    font-weight: bold;
    cursor: pointer;
    transition: all 0.3s ease;
}

.letter-btn:hover {
    transform: scale(1.1);
    background: linear-gradient(135deg, var(--rainbow-purple), var(--rainbow-pink));
}

/* Puzzle Game Styles */
.puzzle-area {
    text-align: center;
    margin: 2rem 0;
}

.puzzle-question h3 {
    color: var(--rainbow-purple);
    font-size: 1.5rem;
    margin-bottom: 2rem;
}

.puzzle-options {
    display: flex;
    flex-wrap: wrap;
    justify-content: center;
    gap: 1rem;
}

.puzzle-option {
    background: linear-gradient(135deg, var(--rainbow-orange), var(--rainbow-red));
    border: 3px solid var(--rainbow-purple);
    border-radius: 1rem;
    padding: 1rem 2rem;
    color: white;
    font-size: 1.1rem;
    font-weight: bold;
    cursor: pointer;
    transition: all 0.3s ease;
}

.puzzle-option:hover {
    transform: scale(1.05);
    background: linear-gradient(135deg, var(--rainbow-green), var(--rainbow-blue));
}

/* Memory Game Styles */
.memory-area {
    display: grid;
    grid-template-columns: repeat(auto-fit, minmax(150px, 1fr));
    gap: 1rem;
    margin: 2rem 0;
}

.memory-card {
    background: linear-gradient(135deg, var(--rainbow-purple), var(--rainbow-pink));
    border: 3px solid var(--rainbow-blue);
    border-radius: 1rem;
    padding: 2rem 1rem;
    text-align: center;
    cursor: pointer;
    transition: all 0.3s ease;
    min-height: 120px;
    display: flex;
    align-items: center;
    justify-content: center;
    color: white;
    font-weight: bold;
    font-size: 1rem;
}

.memory-card:hover {
    transform: scale(1.05);
    box-shadow: 0 6px 12px rgba(0, 0, 0, 0.3);
}

.memory-card.flipped {
    background: linear-gradient(135deg, var(--rainbow-yellow), var(--rainbow-green));
    transform: rotateY(180deg);
}

.memory-card.matched {
    background: linear-gradient(135deg, var(--rainbow-green), var(--rainbow-blue));
    animation: celebrate 0.5s ease;
}

/* Success and Error Messages */
.success-message {
    position: fixed;
    top: 50%;
    left: 50%;
    transform: translate(-50%, -50%);
    background: linear-gradient(135deg, var(--rainbow-green), var(--rainbow-blue));
    color: white;
    padding: 2rem 3rem;
    border-radius: 1rem;
    font-size: 1.3rem;
    font-weight: bold;
    text-align: center;
    box-shadow: 0 10px 30px rgba(0, 0, 0, 0.3);
    z-index: 1000;
    animation: popup 0.3s ease;
}

.error-message {
    position: fixed;
    top: 50%;
    left: 50%;
    transform: translate(-50%, -50%);
    background: linear-gradient(135deg, var(--rainbow-red), var(--rainbow-orange));
    color: white;
    padding: 2rem 3rem;
    border-radius: 1rem;
    font-size: 1.2rem;
    font-weight: bold;
    text-align: center;
    box-shadow: 0 10px 30px rgba(0, 0, 0, 0.3);
    z-index: 1000;
    animation: popup 0.3s ease;
}

@keyframes popup {
    0% { transform: translate(-50%, -50%) scale(0); }
    100% { transform: translate(-50%, -50%) scale(1); }
}

/* Kids Friendly Info Section Styles */
.kids-intro {
    background: linear-gradient(135deg, var(--rainbow-yellow), var(--rainbow-orange));
    border-radius: 1.5rem;
    padding: 2rem;
    color: white;
}

.kids-intro h3 {
    font-size: 1.8rem;
    margin-bottom: 1rem;
    text-shadow: 2px 2px 4px rgba(0, 0, 0, 0.3);
}

.kids-waste-list {
    list-style: none;
    padding: 0;
}

.kids-waste-list li {
    background: rgba(255, 255, 255, 0.2);
    margin: 0.5rem 0;
    padding: 0.8rem;
    border-radius: 1rem;
    font-size: 1.1rem;
    font-weight: bold;
}
/* Kid-Friendly Waste Tracker Styles */

/* Main Tracker Container */
.tracker-container {
    max-width: 1200px;
    margin: 0 auto;
    padding: 20px;
    background: linear-gradient(135deg, #667eea 0%, #764ba2 100%);
    border-radius: 25px;
    box-shadow: 0 10px 30px rgba(102, 126, 234, 0.3);
}

/* Waste Type Selector */
.waste-type-selector {
    background: linear-gradient(45deg, #ff6b6b, #feca57);
    padding: 25px;
    border-radius: 20px;
    margin-bottom: 30px;
    box-shadow: 0 8px 20px rgba(255, 107, 107, 0.3);
}

.waste-type-selector h3 {
    color: white;
    text-align: center;
    font-size: 1.8em;
    margin-bottom: 20px;
    text-shadow: 2px 2px 4px rgba(0,0,0,0.2);
}

.waste-type-options {
    display: flex;
    gap: 20px;
    justify-content: center;
    flex-wrap: wrap;
}

.waste-type-option {
    background: white;
    border: 3px solid #4ecdc4;
    border-radius: 15px;
    padding: 20px;
    cursor: pointer;
    transition: all 0.3s ease;
    text-align: center;
    min-width: 200px;
    box-shadow: 0 5px 15px rgba(78, 205, 196, 0.2);
}

.waste-type-option:hover {
    transform: translateY(-5px);
    box-shadow: 0 10px 25px rgba(78, 205, 196, 0.4);
    background: linear-gradient(45deg, #4ecdc4, #44a3aa);
    color: white;
}

.waste-type-option input[type="radio"] {
    display: none;
}

.waste-type-option input[type="radio"]:checked + .waste-icon {
    transform: scale(1.3);
    filter: drop-shadow(0 0 10px gold);
}

.waste-icon {
    font-size: 3em;
    display: block;
    margin-bottom: 10px;
    transition: all 0.3s ease;
}

.waste-label {
    font-weight: bold;
    font-size: 1.2em;
    display: block;
    margin-bottom: 5px;
    color: #2c3e50;
}

.waste-type-option:hover .waste-label {
    color: white;
}

.waste-desc {
    font-size: 0.9em;
    color: #7f8c8d;
}

.waste-type-option:hover .waste-desc {
    color: rgba(255, 255, 255, 0.9);
}

/* Drop Zone */
.drop-zone-container {
    background: linear-gradient(135deg, #667eea 0%, #764ba2 100%);
    padding: 25px;
    border-radius: 20px;
    margin-bottom: 30px;
}

.drop-zone-container h3 {
    color: white;
    text-align: center;
    font-size: 1.8em;
    margin-bottom: 20px;
    text-shadow: 2px 2px 4px rgba(0,0,0,0.2);
}

.drop-zone {
    border: 4px dashed #feca57;
    border-radius: 20px;
    padding: 40px;
    text-align: center;
    background: white;
    cursor: pointer;
    transition: all 0.3s ease;
    position: relative;
    overflow: hidden;
}

.drop-zone:hover {
    border-color: #ff6b6b;
    background: linear-gradient(45deg, rgba(255, 107, 107, 0.1), rgba(254, 202, 87, 0.1));
    transform: scale(1.02);
}

.drop-zone.dragover {
    border-color: #4ecdc4;
    background: linear-gradient(45deg, rgba(78, 205, 196, 0.2), rgba(68, 163, 170, 0.2));
    transform: scale(1.05);
}

.drop-zone-content {
    pointer-events: none;
}

.drop-icon {
    font-size: 4em;
    color: #feca57;
    margin-bottom: 15px;
    animation: bounce 2s infinite;
}

@keyframes bounce {
    0%, 20%, 50%, 80%, 100% {
        transform: translateY(0);
    }
    40% {
        transform: translateY(-10px);
    }
    60% {
        transform: translateY(-5px);
    }
}

.drop-text {
    font-size: 1.4em;
    font-weight: bold;
    color: #2c3e50;
    margin-bottom: 10px;
}

.drop-subtext {
    font-size: 1.1em;
    color: #7f8c8d;
}

#file-input {
    position: absolute;
    top: 0;
    left: 0;
    width: 100%;
    height: 100%;
    opacity: 0;
    cursor: pointer;
}

/* Image Preview */
.image-preview {
    display: flex;
    flex-wrap: wrap;
    gap: 15px;
    margin-top: 20px;
    justify-content: center;
}

.image-preview-item {
    position: relative;
    width: 150px;
    height: 150px;
    border-radius: 15px;
    overflow: hidden;
    box-shadow: 0 5px 15px rgba(0,0,0,0.2);
    transition: all 0.3s ease;
}

.image-preview-item:hover {
    transform: scale(1.1);
    box-shadow: 0 10px 25px rgba(0,0,0,0.3);
}

.image-preview-item img {
    width: 100%;
    height: 100%;
    object-fit: cover;
}

.image-remove-btn {
    position: absolute;
    top: 5px;
    right: 5px;
    background: #ff6b6b;
    color: white;
    border: none;
    border-radius: 50%;
    width: 30px;
    height: 30px;
    cursor: pointer;
    font-size: 1.2em;
    transition: all 0.3s ease;
}

.image-remove-btn:hover {
    background: #ff5252;
    transform: scale(1.1);
}

/* Calculate Button */
.calculate-section {
    text-align: center;
    margin-bottom: 30px;
}

.fun-calculate-button {
    background: linear-gradient(45deg, #ff6b6b, #feca57);
    color: white;
    border: none;
    border-radius: 25px;
    padding: 20px 40px;
    font-size: 1.3em;
    font-weight: bold;
    cursor: pointer;
    transition: all 0.3s ease;
    box-shadow: 0 8px 20px rgba(255, 107, 107, 0.3);
    display: inline-flex;
    align-items: center;
    gap: 10px;
}

.fun-calculate-button:hover:not(:disabled) {
    transform: translateY(-3px);
    box-shadow: 0 12px 30px rgba(255, 107, 107, 0.5);
    background: linear-gradient(45deg, #ff5252, #ffb347);
}

.fun-calculate-button:disabled {
    background: #95a5a6;
    cursor: not-allowed;
    opacity: 0.6;
}

.btn-icon {
    font-size: 1.2em;
}

.calc-info {
    margin-top: 15px;
    color: white;
    font-size: 1.1em;
    background: rgba(0,0,0,0.2);
    padding: 10px 20px;
    border-radius: 20px;
    display: inline-block;
}

/* Results Display */
.results-display {
    background: linear-gradient(45deg, #4ecdc4, #44a3aa);
    padding: 30px;
    border-radius: 20px;
    margin-bottom: 30px;
    box-shadow: 0 10px 30px rgba(78, 205, 196, 0.3);
}

.results-display h3 {
    color: white;
    text-align: center;
    font-size: 1.8em;
    margin-bottom: 25px;
    text-shadow: 2px 2px 4px rgba(0,0,0,0.2);
}

.result-cards {
    display: flex;
    gap: 20px;
    justify-content: center;
    flex-wrap: wrap;
}

.result-card {
    background: white;
    border-radius: 15px;
    padding: 20px;
    text-align: center;
    min-width: 180px;
    box-shadow: 0 5px 15px rgba(0,0,0,0.1);
    transition: all 0.3s ease;
}

.result-card:hover {
    transform: translateY(-5px);
    box-shadow: 0 10px 25px rgba(0,0,0,0.2);
}

.result-icon {
    font-size: 2.5em;
    display: block;
    margin-bottom: 10px;
}

.result-label {
    font-weight: bold;
    color: #2c3e50;
    display: block;
    margin-bottom: 8px;
}

.result-value {
    font-size: 1.8em;
    color: #4ecdc4;
    font-weight: bold;
}

/* History Section */
.history-section {
    background: linear-gradient(135deg, #667eea 0%, #764ba2 100%);
    padding: 30px;
    border-radius: 20px;
    box-shadow: 0 10px 30px rgba(102, 126, 234, 0.3);
}

.history-section h3 {
    color: white;
    text-align: center;
    font-size: 1.8em;
    margin-bottom: 25px;
    text-shadow: 2px 2px 4px rgba(0,0,0,0.2);
}

.history-container {
    min-height: 200px;
    margin-bottom: 20px;
}

.empty-history {
    text-align: center;
    padding: 40px;
    color: white;
    font-size: 1.2em;
}

.empty-icon {
    font-size: 3em;
    display: block;
    margin-bottom: 15px;
}

.history-item {
    background: white;
    border-radius: 15px;
    padding: 20px;
    margin-bottom: 15px;
    display: flex;
    align-items: center;
    gap: 15px;
    transition: all 0.3s ease;
    box-shadow: 0 5px 15px rgba(0,0,0,0.1);
}

.history-item:hover {
    transform: translateX(5px);
    box-shadow: 0 8px 20px rgba(0,0,0,0.2);
}

.history-image {
    width: 80px;
    height: 80px;
    border-radius: 10px;
    object-fit: cover;
}

.history-details {
    flex: 1;
}

.history-type {
    font-weight: bold;
    color: #2c3e50;
    font-size: 1.2em;
    margin-bottom: 5px;
}

.history-date {
    color: #7f8c8d;
    font-size: 0.9em;
}

.history-delete {
    background: #ff6b6b;
    color: white;
    border: none;
    border-radius: 10px;
    padding: 10px 15px;
    cursor: pointer;
    transition: all 0.3s ease;
}

.history-delete:hover {
    background: #ff5252;
    transform: scale(1.1);
}

.clear-button {
    background: linear-gradient(45deg, #ff6b6b, #feca57);
    color: white;
    border: none;
    border-radius: 20px;
    padding: 15px 30px;
    font-size: 1.1em;
    font-weight: bold;
    cursor: pointer;
    transition: all 0.3s ease;
    display: inline-flex;
    align-items: center;
    gap: 8px;
    margin: 0 auto;
}

.clear-button:hover {
    background: linear-gradient(45deg, #ff5252, #ffb347);
    transform: translateY(-2px);
    box-shadow: 0 8px 20px rgba(255, 107, 107, 0.4);
}

/* Responsive Design */
@media (max-width: 768px) {
    .tracker-container {
        padding: 15px;
    }
    
    .waste-type-options {
        flex-direction: column;
        align-items: center;
    }
    
    .waste-type-option {
        min-width: 250px;
    }
    
    .result-cards {
        flex-direction: column;
        align-items: center;
    }
    
    .result-card {
        min-width: 200px;
    }
    
    .history-item {
        flex-direction: column;
        text-align: center;
    }
}