/* ==========================================================================
   Assam Kids Learn - Educational Games Website
   Styles for students aged 6-9 in Assam, India
   ========================================================================== */

/* CSS Variables */
:root {
    --primary-blue: #2196F3;
    --primary-green: #4CAF50;
    --primary-orange: #FF9800;
    --primary-purple: #9C27B0;
    --primary-red: #F44336;
    --bg-cream: #FFF8E1;
    --bg-light: #FAFAFA;
    --text-dark: #333333;
    --text-light: #666666;
    --white: #FFFFFF;
    --shadow-sm: 0 2px 4px rgba(0,0,0,0.1);
    --shadow-md: 0 4px 12px rgba(0,0,0,0.15);
    --shadow-lg: 0 8px 24px rgba(0,0,0,0.2);
    --border-radius: 16px;
    --transition: all 0.3s ease;
}

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

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

body {
    font-family: 'Nunito', sans-serif;
    background: var(--bg-cream);
    color: var(--text-dark);
    min-height: 100vh;
    overflow-x: hidden;
}

/* Typography */
h1, h2, h3, h4 {
    font-weight: 700;
    line-height: 1.3;
}

h1 { font-size: 1.75rem; }
h2 { font-size: 1.5rem; }
h3 { font-size: 1.25rem; }
h4 { font-size: 1.1rem; }

p {
    line-height: 1.6;
    color: var(--text-light);
}

/* ==========================================================================
   Modal Styles
   ========================================================================== */
.modal {
    display: none;
    position: fixed;
    top: 0;
    left: 0;
    width: 100%;
    height: 100%;
    background: rgba(0, 0, 0, 0.7);
    z-index: 1000;
    justify-content: center;
    align-items: center;
    animation: fadeIn 0.3s ease;
}

.modal.active {
    display: flex;
}

.modal-content {
    background: var(--white);
    border-radius: var(--border-radius);
    padding: 2rem;
    max-width: 90%;
    width: 400px;
    text-align: center;
    box-shadow: var(--shadow-lg);
    animation: slideUp 0.4s ease;
    color: var(--text-dark);
}

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

@keyframes slideUp {
    from { transform: translateY(50px); opacity: 0; }
    to { transform: translateY(0); opacity: 1; }
}

/* Language Modal */
.language-modal h2 {
    margin-bottom: 1.5rem;
    color: var(--primary-blue);
}

.language-options {
    display: flex;
    flex-direction: column;
    gap: 1rem;
}

.lang-btn {
    display: flex;
    align-items: center;
    gap: 1rem;
    padding: 1rem 1.5rem;
    border: 2px solid #E0E0E0;
    border-radius: 12px;
    background: var(--white);
    font-size: 1.1rem;
    font-weight: 600;
    cursor: pointer;
    transition: var(--transition);
}

.lang-btn:hover {
    border-color: var(--primary-blue);
    background: #E3F2FD;
    transform: scale(1.02);
}

.lang-flag {
    font-size: 1.5rem;
}

/* ==========================================================================
   Loading Screen
   ========================================================================== */
.loading-screen {
    position: fixed;
    top: 0;
    left: 0;
    width: 100%;
    height: 100%;
    background: linear-gradient(135deg, #2196F3, #4CAF50);
    display: flex;
    justify-content: center;
    align-items: center;
    z-index: 2000;
    transition: opacity 0.5s ease;
}

.loading-screen.hidden {
    opacity: 0;
    pointer-events: none;
}

.loader {
    text-align: center;
    color: var(--white);
}

.loader-icon {
    font-size: 4rem;
    animation: bounce 1s infinite;
}

@keyframes bounce {
    0%, 100% { transform: translateY(0); }
    50% { transform: translateY(-20px); }
}

.loader-text {
    font-size: 1.5rem;
    margin-top: 1rem;
    font-weight: 600;
}

.loader-bar {
    width: 200px;
    height: 8px;
    background: rgba(255,255,255,0.3);
    border-radius: 4px;
    margin: 1rem auto 0;
    overflow: hidden;
}

.loader-progress {
    height: 100%;
    background: var(--white);
    border-radius: 4px;
    width: 0%;
    animation: loading 2s ease-in-out forwards;
}

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

/* ==========================================================================
   App Container
   ========================================================================== */
.app-container {
    display: flex;
    flex-direction: column;
    min-height: 100vh;
}

/* ==========================================================================
   Header
   ========================================================================== */
.app-header {
    display: flex;
    justify-content: space-between;
    align-items: center;
    padding: 0.75rem 1rem;
    background: var(--white);
    box-shadow: var(--shadow-sm);
    position: sticky;
    top: 0;
    z-index: 100;
}

.header-left, .header-right {
    display: flex;
    align-items: center;
    gap: 0.75rem;
}

.logo {
    display: flex;
    align-items: center;
    gap: 0.5rem;
}

.logo-icon {
    font-size: 1.75rem;
}

.logo-text {
    font-size: 1.1rem;
    font-weight: 800;
    color: var(--primary-blue);
}

.icon-btn {
    width: 40px;
    height: 40px;
    border: none;
    border-radius: 12px;
    background: #F5F5F5;
    font-size: 1.25rem;
    cursor: pointer;
    transition: var(--transition);
    display: flex;
    align-items: center;
    justify-content: center;
}

.icon-btn:hover {
    background: #E0E0E0;
    transform: scale(1.05);
}

.user-avatar {
    width: 40px;
    height: 40px;
    border-radius: 50%;
    background: linear-gradient(135deg, var(--primary-purple), var(--primary-blue));
    display: flex;
    align-items: center;
    justify-content: center;
    font-size: 1.25rem;
    cursor: pointer;
}

/* ==========================================================================
   Sidebar Navigation
   ========================================================================== */
.sidebar {
    position: fixed;
    top: 0;
    left: -280px;
    width: 280px;
    height: 100%;
    background: var(--white);
    box-shadow: var(--shadow-lg);
    z-index: 150;
    transition: left 0.3s ease;
    display: flex;
    flex-direction: column;
}

.sidebar.active {
    left: 0;
}

.sidebar-overlay {
    position: fixed;
    top: 0;
    left: 0;
    width: 100%;
    height: 100%;
    background: rgba(0,0,0,0.5);
    z-index: 140;
    display: none;
}

.sidebar-overlay.active {
    display: block;
}

.sidebar-header {
    display: flex;
    justify-content: space-between;
    align-items: center;
    padding: 1.25rem;
    background: linear-gradient(135deg, var(--primary-blue), var(--primary-green));
    color: var(--white);
}

.close-btn {
    width: 32px;
    height: 32px;
    border: none;
    border-radius: 8px;
    background: rgba(255,255,255,0.2);
    color: var(--white);
    font-size: 1.5rem;
    cursor: pointer;
}

.nav-menu {
    list-style: none;
    padding: 1rem 0;
    flex: 1;
}

.nav-item {
    display: block;
    padding: 1rem 1.25rem;
    text-decoration: none;
    color: var(--text-dark);
    font-weight: 600;
    transition: var(--transition);
    border-left: 4px solid transparent;
}

.nav-item:hover, .nav-item.active {
    background: #F5F5F5;
    border-left-color: var(--primary-blue);
    color: var(--primary-blue);
}

.sidebar-footer {
    padding: 1rem;
    border-top: 1px solid #E0E0E0;
}

.settings-btn {
    width: 100%;
    padding: 0.75rem;
    border: none;
    border-radius: 8px;
    background: #F5F5F5;
    font-size: 1rem;
    cursor: pointer;
    transition: var(--transition);
}

.settings-btn:hover {
    background: #E0E0E0;
}

/* ==========================================================================
   Main Content
   ========================================================================== */
.main-content {
    flex: 1;
    padding: 1rem;
    padding-bottom: 80px;
}

.content-section {
    display: none;
    animation: fadeIn 0.3s ease;
}

.content-section.active {
    display: block;
}

/* Welcome Banner */
.welcome-banner {
    background: linear-gradient(135deg, #2196F3, #4CAF50);
    border-radius: var(--border-radius);
    padding: 1.5rem;
    display: flex;
    justify-content: space-between;
    align-items: center;
    color: var(--white);
    margin-bottom: 1.5rem;
}

.welcome-text h1 {
    margin-bottom: 0.25rem;
}

.welcome-text p {
    color: rgba(255,255,255,0.9);
    font-size: 0.95rem;
}

.streak-badge {
    display: inline-block;
    margin-top: 0.5rem;
    background: rgba(255,255,255,0.25);
    color: #fff;
    font-size: 0.8rem;
    font-weight: 700;
    padding: 0.2rem 0.75rem;
    border-radius: 20px;
    cursor: default;
}

.mascot {
    font-size: 3.5rem;
    animation: wave 2s infinite;
}

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

/* Daily Challenge Card */
.daily-challenge-card {
    background: var(--white);
    border-radius: var(--border-radius);
    padding: 1.25rem;
    box-shadow: var(--shadow-md);
    margin-bottom: 1.5rem;
    border: 2px solid #FFD54F;
}

.challenge-badge {
    display: inline-block;
    background: #FFD54F;
    color: #5D4037;
    padding: 0.25rem 0.75rem;
    border-radius: 20px;
    font-size: 0.75rem;
    font-weight: 700;
    margin-bottom: 0.75rem;
}

.daily-challenge-card h3 {
    margin-bottom: 1rem;
    color: var(--text-dark);
}

.challenge-progress {
    display: flex;
    align-items: center;
    gap: 1rem;
    margin-bottom: 1rem;
}

.progress-bar {
    flex: 1;
    height: 10px;
    background: #E0E0E0;
    border-radius: 5px;
    overflow: hidden;
}

.progress-fill {
    height: 100%;
    background: linear-gradient(90deg, var(--primary-orange), var(--primary-red));
    border-radius: 5px;
    transition: width 0.5s ease;
}

.progress-text {
    font-weight: 700;
    color: var(--text-light);
    min-width: 40px;
}

/* Section Titles */
.section-title {
    margin-bottom: 1rem;
    color: var(--text-dark);
}

.subsection-title {
    margin: 1.5rem 0 1rem;
    color: var(--text-dark);
}

/* Subject Grid */
.subject-grid {
    display: grid;
    grid-template-columns: repeat(2, 1fr);
    gap: 1rem;
    margin-bottom: 1.5rem;
}

.subject-card {
    background: var(--white);
    border-radius: var(--border-radius);
    padding: 1.25rem;
    text-align: center;
    box-shadow: var(--shadow-sm);
    cursor: pointer;
    transition: var(--transition);
    border: 3px solid transparent;
}

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

.subject-card.math {
    border-color: var(--primary-blue);
}

.subject-card.english {
    border-color: var(--primary-purple);
}

.subject-card.assamese {
    border-color: var(--primary-orange);
}

.subject-card.evs {
    border-color: var(--primary-green);
}

.subject-icon {
    font-size: 2.5rem;
    margin-bottom: 0.5rem;
}

.subject-card h3 {
    margin-bottom: 0.25rem;
    color: var(--text-dark);
}

.subject-card p {
    font-size: 0.8rem;
    margin-bottom: 0.5rem;
}

.subject-progress {
    font-weight: 700;
    color: #FFD54F;
}

/* Play Button */
.play-btn {
    background: linear-gradient(135deg, var(--primary-blue), var(--primary-green));
    color: var(--white);
    border: none;
    padding: 0.75rem 1.5rem;
    border-radius: 25px;
    font-size: 1rem;
    font-weight: 700;
    cursor: pointer;
    transition: var(--transition);
    width: 100%;
}

.play-btn:hover {
    transform: scale(1.05);
    box-shadow: var(--shadow-md);
}

.all-games-btn {
    margin-top: 1rem;
    width: 100%;
    padding: 1rem;
    font-size: 1.1rem;
    background: linear-gradient(135deg, var(--primary-purple), var(--primary-blue));
}

/* Games Carousel */
.games-carousel {
    display: flex;
    gap: 1rem;
    overflow-x: auto;
    padding-bottom: 1rem;
    scroll-snap-type: x mandatory;
}

.games-carousel::-webkit-scrollbar {
    height: 6px;
}

.games-carousel::-webkit-scrollbar-track {
    background: #E0E0E0;
    border-radius: 3px;
}

.games-carousel::-webkit-scrollbar-thumb {
    background: var(--primary-blue);
    border-radius: 3px;
}

.game-card {
    flex: 0 0 200px;
    background: var(--white);
    border-radius: var(--border-radius);
    overflow: hidden;
    box-shadow: var(--shadow-sm);
    scroll-snap-align: start;
    transition: var(--transition);
}

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

.game-thumbnail {
    height: 100px;
    background: linear-gradient(135deg, #E0E0E0, #BDBDBD);
    display: flex;
    align-items: center;
    justify-content: center;
    font-size: 3rem;
    color: rgba(255, 255, 255, 0.9);
    text-shadow: 0 2px 4px rgba(0, 0, 0, 0.2);
    user-select: none;
}

.number-game-bg {
    background: linear-gradient(135deg, #2196F3, #1976D2);
}

.word-game-bg {
    background: linear-gradient(135deg, #9C27B0, #7B1FA2);
}

.assamese-game-bg {
    background: linear-gradient(135deg, #FF9800, #F57C00);
}

.nature-game-bg {
    background: linear-gradient(135deg, #4CAF50, #388E3C);
}

.game-info {
    padding: 1rem;
}

.game-badge {
    display: inline-block;
    padding: 0.25rem 0.5rem;
    border-radius: 12px;
    font-size: 0.7rem;
    font-weight: 700;
    margin-bottom: 0.5rem;
}

.game-badge.math { background: #E3F2FD; color: #1976D2; }
.game-badge.english { background: #F3E5F5; color: #7B1FA2; }
.game-badge.assamese { background: #FFF3E0; color: #F57C00; }
.game-badge.evs { background: #E8F5E9; color: #388E3C; }

.game-info h4 {
    margin-bottom: 0.25rem;
    color: var(--text-dark);
}

.game-info p {
    font-size: 0.8rem;
    margin-bottom: 0.75rem;
}

.play-btn-small {
    background: var(--primary-blue);
    color: var(--white);
    border: none;
    padding: 0.5rem 1rem;
    border-radius: 20px;
    font-size: 0.85rem;
    font-weight: 600;
    cursor: pointer;
    transition: var(--transition);
}

.play-btn-small:hover {
    background: #1976D2;
}

/* Games Filter */
.games-filter {
    display: flex;
    gap: 0.5rem;
    margin-bottom: 1rem;
    overflow-x: auto;
    padding-bottom: 0.5rem;
}

.filter-btn {
    padding: 0.5rem 1rem;
    border: none;
    border-radius: 20px;
    background: var(--white);
    font-size: 0.85rem;
    font-weight: 600;
    cursor: pointer;
    white-space: nowrap;
    transition: var(--transition);
    box-shadow: var(--shadow-sm);
}

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

/* Games Grid */
.games-grid {
    display: grid;
    grid-template-columns: repeat(2, 1fr);
    gap: 1rem;
}

/* ==========================================================================
   Progress Section
   ========================================================================== */
.progress-overview {
    display: grid;
    grid-template-columns: repeat(3, 1fr);
    gap: 1rem;
    margin-bottom: 1.5rem;
}

.progress-stat {
    background: var(--white);
    border-radius: var(--border-radius);
    padding: 1.25rem;
    text-align: center;
    box-shadow: var(--shadow-sm);
}

.stat-icon {
    font-size: 2rem;
    margin-bottom: 0.5rem;
}

.stat-value {
    font-size: 2rem;
    font-weight: 800;
    color: var(--primary-blue);
}

.stat-label {
    font-size: 0.8rem;
    color: var(--text-light);
}

.subject-progress-list {
    display: flex;
    flex-direction: column;
    gap: 1rem;
}

.progress-item {
    background: var(--white);
    border-radius: var(--border-radius);
    padding: 1rem;
    box-shadow: var(--shadow-sm);
}

.progress-label {
    display: flex;
    justify-content: space-between;
    margin-bottom: 0.5rem;
    font-weight: 600;
}

.progress-percent {
    color: var(--primary-blue);
}

.progress-bar-large {
    height: 12px;
    background: #E0E0E0;
    border-radius: 6px;
    overflow: hidden;
}

/* ==========================================================================
   Game Container
   ========================================================================== */
.game-container {
    position: fixed;
    top: 0;
    left: 0;
    width: 100%;
    height: 100%;
    background: var(--bg-light);
    z-index: 200;
    display: none;
    flex-direction: column;
}

.game-container.active {
    display: flex;
}

.game-header {
    display: flex;
    justify-content: space-between;
    align-items: center;
    padding: 0.75rem 1rem;
    background: var(--white);
    box-shadow: var(--shadow-sm);
}

.back-btn {
    background: #F5F5F5;
    border: none;
    padding: 0.5rem 1rem;
    border-radius: 8px;
    font-size: 0.9rem;
    font-weight: 600;
    cursor: pointer;
    transition: var(--transition);
}

.back-btn:hover {
    background: #E0E0E0;
}

.game-title {
    font-weight: 700;
    color: var(--text-dark);
}

.game-stats {
    display: flex;
    gap: 1rem;
    font-weight: 600;
}

#gameScore {
    color: #FFD54F;
}

.game-canvas {
    flex: 1;
    display: flex;
    justify-content: center;
    align-items: center;
    padding: 1rem;
    overflow: auto;
}

.game-controls {
    padding: 1rem;
    background: var(--white);
    box-shadow: 0 -2px 10px rgba(0,0,0,0.1);
}

/* ==========================================================================
   Toast Notifications
   ========================================================================== */
.toast-container {
    position: fixed;
    top: 80px;
    right: 1rem;
    z-index: 300;
    display: flex;
    flex-direction: column;
    gap: 0.5rem;
}

.toast {
    background: var(--white);
    padding: 1rem 1.5rem;
    border-radius: 12px;
    box-shadow: var(--shadow-lg);
    animation: slideIn 0.3s ease;
    display: flex;
    align-items: center;
    gap: 0.75rem;
    min-width: 250px;
}

@keyframes slideIn {
    from { transform: translateX(100%); opacity: 0; }
    to { transform: translateX(0); opacity: 1; }
}

.toast.success { border-left: 4px solid var(--primary-green); }
.toast.error { border-left: 4px solid var(--primary-red); }
.toast.info { border-left: 4px solid var(--primary-blue); }

.toast-icon {
    font-size: 1.5rem;
}

.toast-message {
    flex: 1;
    font-weight: 600;
}

/* ==========================================================================
   Responsive Design
   ========================================================================== */
@media (min-width: 768px) {
    .subject-grid {
        grid-template-columns: repeat(4, 1fr);
    }
    
    .games-grid {
        grid-template-columns: repeat(3, 1fr);
    }
    
    .games-carousel .game-card {
        flex: 0 0 220px;
    }
}

@media (min-width: 1024px) {
    .main-content {
        max-width: 1200px;
        margin: 0 auto;
        padding: 2rem;
    }
    
    .subject-grid {
        grid-template-columns: repeat(4, 1fr);
    }
    
    .games-grid {
        grid-template-columns: repeat(4, 1fr);
    }
}

/* Low Data Mode */
.low-data .game-thumbnail {
    display: none;
}

.low-data .loader-icon {
    animation: none;
}

/* Dark mode support */
@media (prefers-color-scheme: dark) {
    :root {
        --bg-cream: #1a1a2e;
        --bg-light: #16213e;
        --text-dark: #EAEAEA;
        --text-light: #B0B0B0;
    }

    .app-header, .sidebar, .subject-card, .game-card,
    .daily-challenge-card, .progress-stat, .progress-item {
        background: #1f2937;
    }

    .icon-btn, .settings-btn, .filter-btn, .back-btn {
        background: #374151;
    }

    /* Modals are outside #app so must be overridden here too */
    .modal-content {
        background: #1f2937;
        color: #EAEAEA;
    }

    .modal-header h2,
    .modal-content h2,
    .modal-content h3,
    .modal-content label,
    .modal-content p,
    .setting-label {
        color: #EAEAEA;
    }

    .lang-btn, .setting-option, .name-input {
        background: #374151;
        border-color: #4B5563;
        color: #EAEAEA;
    }

    .name-input::placeholder { color: #9CA3AF; }

    .avatar-option {
        background: #374151;
        border-color: #4B5563;
        color: #EAEAEA;
    }

    .modal-close-btn, .close-btn {
        background: #374151;
        color: #EAEAEA;
    }

    .setting-group {
        border-bottom-color: #374151;
    }

    .quiz-question, .problem-display, .game-status,
    .animal-card, .shape-target, .adventure-header {
        background: #1f2937 !important;
        color: #EAEAEA !important;
    }
}

/* Manual Dark Mode */
.dark-mode {
    --bg-cream: #1a1a2e;
    --bg-light: #16213e;
    --text-dark: #EAEAEA;
    --text-light: #B0B0B0;
    --white: #1f2937;
    --shadow-sm: 0 2px 4px rgba(0,0,0,0.3);
    --shadow-md: 0 4px 12px rgba(0,0,0,0.4);
    --shadow-lg: 0 8px 24px rgba(0,0,0,0.5);
}

.dark-mode .app-header,
.dark-mode .sidebar,
.dark-mode .subject-card,
.dark-mode .game-card,
.dark-mode .daily-challenge-card,
.dark-mode .progress-stat,
.dark-mode .progress-item,
.dark-mode .modal-content,
.dark-mode .settings-modal,
.dark-mode .profile-modal,
.dark-mode .game-complete-modal {
    background: #1f2937;
    color: #EAEAEA;
}

.dark-mode .icon-btn,
.dark-mode .settings-btn,
.dark-mode .filter-btn,
.dark-mode .back-btn,
.dark-mode .close-btn,
.dark-mode .modal-close-btn {
    background: #374151;
    color: #EAEAEA;
}

.dark-mode .nav-item {
    color: #EAEAEA;
}

.dark-mode .nav-item:hover,
.dark-mode .nav-item.active {
    background: #374151;
}

.dark-mode .lang-btn,
.dark-mode .setting-option,
.dark-mode .name-input {
    background: #374151;
    border-color: #4B5563;
    color: #EAEAEA;
}

.dark-mode .name-input::placeholder {
    color: #B0B0B0;
}

.dark-mode .toast {
    background: #1f2937;
    color: #EAEAEA;
}

.dark-mode .game-canvas {
    background: #16213e;
}

.dark-mode .game-container {
    background: #1a1a2e;
}

.dark-mode .game-header {
    background: #1f2937;
}

.dark-mode .game-controls {
    background: #1f2937;
}

.dark-mode .game-stats {
    color: #EAEAEA;
}

.dark-mode #gameLevel {
    color: #EAEAEA;
}

/* Game area inner elements in dark mode (override inline white backgrounds) */
.dark-mode .game-status,
.dark-mode .problem-display,
.dark-mode .quiz-question,
.dark-mode .animal-card,
.dark-mode .shape-target,
.dark-mode .adventure-header,
.dark-mode .word-search-grid,
.dark-mode .word-item,
.dark-mode .count-display,
.dark-mode .game-area,
.dark-mode .game-instructions,
.dark-mode .completion-stats,
.dark-mode .stat-row {
    background: #1f2937 !important;
    color: #EAEAEA !important;
}

.dark-mode .game-instructions p,
.dark-mode .game-area p,
.dark-mode .game-score,
.dark-mode .game-level,
.dark-mode .quiz-progress,
.dark-mode .progress-text,
.dark-mode .stat-row span {
    color: #EAEAEA !important;
}

.dark-mode .number-card,
.dark-mode .memory-card:not(.flipped):not(.matched),
.dark-mode .option-btn,
.dark-mode .match-card,
.dark-mode .quiz-option,
.dark-mode .nav-btn,
.dark-mode .count-item,
.dark-mode .letter-cell {
    background: #374151 !important;
    color: #EAEAEA !important;
    border-color: #4B5563 !important;
}

/* Preserve colored states even in dark mode */
.dark-mode .letter-cell.selected { background: #FF9800 !important; color: white !important; }
.dark-mode .letter-cell.found { background: #4CAF50 !important; color: white !important; }
.dark-mode .letter-cell.wrong { background: #F44336 !important; color: white !important; }
.dark-mode .word-item.found { background: #4CAF50 !important; color: white !important; }
.dark-mode .memory-card.flipped { background: #2d3748 !important; color: #EAEAEA !important; border-color: #2196F3 !important; }
.dark-mode .memory-card.matched { background: #1a4731 !important; color: #68D391 !important; border-color: #4CAF50 !important; }
.dark-mode .quiz-option.correct { background: #1a4731 !important; color: #68D391 !important; }
.dark-mode .quiz-option.wrong,
.dark-mode .option-btn.wrong { background: #4a1c1c !important; color: #FC8181 !important; }
.dark-mode .option-btn.correct { background: #1a4731 !important; color: #68D391 !important; }

/* ==========================================================================
   Confetti
   ========================================================================== */
.confetti-container {
    position: fixed;
    top: 0;
    left: 0;
    width: 100%;
    height: 100%;
    pointer-events: none;
    z-index: 10000;
    overflow: hidden;
}

.confetti-piece {
    position: absolute;
    width: 10px;
    height: 10px;
    top: -10px;
    animation: confettiFall linear forwards;
}

@keyframes confettiFall {
    0% {
        transform: translateY(0) rotate(0deg);
        opacity: 1;
    }
    100% {
        transform: translateY(100vh) rotate(720deg);
        opacity: 0;
    }
}

/* Animations for young children */
@keyframes celebrate {
    0% { transform: scale(1); }
    50% { transform: scale(1.2); }
    100% { transform: scale(1); }
}

.celebrate {
    animation: celebrate 0.5s ease;
}

/* Touch-friendly improvements */
@media (pointer: coarse) {
    .play-btn, .play-btn-small, .lang-btn, .filter-btn {
        min-height: 48px;
    }
    
    .icon-btn {
        min-width: 48px;
        min-height: 48px;
    }
}

/* ==========================================================================
   Modal Improvements
   ========================================================================== */
.modal-header {
    display: flex;
    justify-content: space-between;
    align-items: center;
    margin-bottom: 1.5rem;
}

.modal-header h2 {
    margin-bottom: 0;
    color: var(--text-dark);
}

.modal-close-btn {
    width: 36px;
    height: 36px;
    border: none;
    border-radius: 50%;
    background: #F5F5F5;
    font-size: 1.5rem;
    cursor: pointer;
    transition: var(--transition);
    display: flex;
    align-items: center;
    justify-content: center;
}

.modal-close-btn:hover {
    background: #E0E0E0;
    transform: rotate(90deg);
}

/* ==========================================================================
   Settings Modal
   ========================================================================== */
.settings-modal {
    text-align: left;
    max-height: 80vh;
    overflow-y: auto;
    color: var(--text-dark);
}

.setting-group {
    display: flex;
    justify-content: space-between;
    align-items: center;
    padding: 1rem 0;
    border-bottom: 1px solid #F0F0F0;
}

.setting-group:last-child {
    border-bottom: none;
    justify-content: center;
}

.setting-label {
    font-weight: 600;
    color: var(--text-dark);
    font-size: 1rem;
}

.setting-options {
    display: flex;
    gap: 0.5rem;
    flex-wrap: wrap;
    margin-top: 0.5rem;
}

.setting-option {
    padding: 0.5rem 1rem;
    border: 2px solid #E0E0E0;
    border-radius: 10px;
    background: var(--white);
    font-size: 0.9rem;
    font-weight: 600;
    cursor: pointer;
    transition: var(--transition);
}

.setting-option.active {
    border-color: var(--primary-blue);
    background: #E3F2FD;
}

.setting-option:hover {
    border-color: var(--primary-blue);
}

/* Toggle Switch */
.toggle-switch {
    position: relative;
    width: 52px;
    height: 28px;
}

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

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

.toggle-slider::before {
    content: "";
    position: absolute;
    height: 22px;
    width: 22px;
    left: 3px;
    bottom: 3px;
    background: white;
    border-radius: 50%;
    transition: 0.3s;
}

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

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

.reset-btn {
    background: var(--primary-red);
    color: white;
    border: none;
    padding: 0.75rem 1.5rem;
    border-radius: 12px;
    font-size: 0.95rem;
    font-weight: 600;
    cursor: pointer;
    transition: var(--transition);
}

.reset-btn:hover {
    background: #D32F2F;
    transform: scale(1.02);
}

/* ==========================================================================
   Profile/Avatar Modal
   ========================================================================== */
.profile-modal {
    text-align: center;
    color: var(--text-dark);
}

.avatar-grid {
    display: grid;
    grid-template-columns: repeat(4, 1fr);
    gap: 0.75rem;
    margin-bottom: 1.5rem;
}

.avatar-option {
    width: 60px;
    height: 60px;
    border: 3px solid #E0E0E0;
    border-radius: 50%;
    background: var(--white);
    font-size: 2rem;
    cursor: pointer;
    transition: var(--transition);
    display: flex;
    align-items: center;
    justify-content: center;
    color: var(--text-dark);
}

.avatar-option:hover {
    border-color: var(--primary-blue);
    transform: scale(1.1);
}

.avatar-option.selected {
    border-color: var(--primary-blue);
    background: #E3F2FD;
    box-shadow: 0 0 0 3px rgba(33, 150, 243, 0.3);
}

.name-input {
    width: 100%;
    padding: 0.75rem 1rem;
    border: 2px solid #E0E0E0;
    border-radius: 12px;
    font-size: 1rem;
    font-family: 'Nunito', sans-serif;
    transition: var(--transition);
    text-align: center;
    background: var(--white);
    color: var(--text-dark);
}

.name-input::placeholder {
    color: var(--text-light);
    opacity: 0.7;
}

.name-input:focus {
    outline: none;
    border-color: var(--primary-blue);
    box-shadow: 0 0 0 3px rgba(33, 150, 243, 0.2);
}

.profile-name-section {
    margin-top: 1rem;
}

/* ==========================================================================
   Game Complete Modal
   ========================================================================== */
.game-complete-modal {
    text-align: center;
    padding: 2rem;
    color: var(--text-dark);
}

.completion-celebration {
    animation: popIn 0.5s ease;
}

@keyframes popIn {
    0% { transform: scale(0.5); opacity: 0; }
    70% { transform: scale(1.1); }
    100% { transform: scale(1); opacity: 1; }
}

.completion-icon {
    font-size: 4rem;
    margin-bottom: 1rem;
    animation: bounce 0.6s infinite;
}

.stars-earned {
    display: flex;
    justify-content: center;
    gap: 0.5rem;
    margin: 1rem 0 1.5rem;
}

.stars-earned .star {
    font-size: 2.5rem;
    opacity: 0.2;
    transition: all 0.3s ease;
}

.stars-earned .star.earned {
    opacity: 1;
    animation: starPop 0.5s ease;
}

@keyframes starPop {
    0% { transform: scale(0); }
    70% { transform: scale(1.3); }
    100% { transform: scale(1); }
}

.completion-stats {
    background: #F5F5F5;
    border-radius: 12px;
    padding: 1rem;
    margin-bottom: 1.5rem;
    color: var(--text-dark);
}

.stat-row {
    display: flex;
    justify-content: space-between;
    padding: 0.5rem 0;
    font-weight: 600;
}

.stat-row .stat-value {
    color: var(--primary-blue);
    font-size: 1.2rem;
}

.completion-actions {
    display: flex;
    flex-direction: column;
    gap: 0.75rem;
}

.play-btn.secondary {
    background: linear-gradient(135deg, var(--primary-orange), var(--primary-red));
}

.play-btn.outline {
    background: transparent;
    color: var(--text-dark);
    border: 2px solid #E0E0E0;
}

.play-btn.outline:hover {
    background: #F5F5F5;
}

/* ==========================================================================
   Badges Grid
   ========================================================================== */
.badges-grid {
    display: grid;
    grid-template-columns: repeat(4, 1fr);
    gap: 0.75rem;
    margin-bottom: 1.5rem;
}

.badge-item {
    display: flex;
    flex-direction: column;
    align-items: center;
    padding: 0.75rem;
    background: var(--white);
    border-radius: 12px;
    box-shadow: var(--shadow-sm);
    transition: var(--transition);
}

.badge-item.locked {
    opacity: 0.4;
    filter: grayscale(1);
}

.badge-item:not(.locked):hover {
    transform: translateY(-2px);
    box-shadow: var(--shadow-md);
}

.badge-icon {
    font-size: 2rem;
    margin-bottom: 0.25rem;
}

.badge-name {
    font-size: 0.65rem;
    font-weight: 600;
    text-align: center;
    color: var(--text-light);
}

/* ==========================================================================
   Sound Toggle Button
   ========================================================================== */
.icon-btn.sound-off {
    opacity: 0.5;
}

/* ==========================================================================
   Low Data Mode Enhancements
   ========================================================================== */
.low-data .confetti-container {
    display: none;
}

.low-data .mascot {
    animation: none;
}

.low-data .welcome-banner {
    background: var(--primary-blue);
}

/* ==========================================================================
   Focus States for Accessibility
   ========================================================================== */
button:focus-visible,
a:focus-visible,
input:focus-visible {
    outline: 3px solid var(--primary-blue);
    outline-offset: 2px;
}

.nav-item:focus-visible {
    outline: 2px solid var(--primary-blue);
    outline-offset: -2px;
}

/* ==========================================================================
   Improved Hover States
   ========================================================================== */
.subject-card:active {
    transform: scale(0.97);
}

.play-btn:active,
.play-btn-small:active {
    transform: scale(0.95);
}

/* ==========================================================================
   Smooth Page Transitions
   ========================================================================== */
.content-section {
    animation: fadeSlideIn 0.35s ease;
}

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

/* ==========================================================================
   Pulsing Play Button
   ========================================================================== */
.play-btn-small {
    animation: pulse 2s infinite;
}

@keyframes pulse {
    0%, 100% { box-shadow: 0 0 0 0 rgba(33, 150, 243, 0.4); }
    50% { box-shadow: 0 0 0 8px rgba(33, 150, 243, 0); }
}

.play-btn-small:hover {
    animation: none;
}