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

:root {
    /* Color Palette */
    --primary-color: #4CAF50;
    --secondary-color: #2196F3;
    --accent-color: #FF9800;
    --success-color: #8BC34A;
    --warning-color: #FFC107;
    --error-color: #F44336;
    --background-color: #F8F9FA;
    --card-background: #FFFFFF;
    --text-color: #333333;
    --text-light: #666666;
    --border-color: #E0E0E0;
    --shadow: 0 2px 10px rgba(0, 0, 0, 0.1);
    --shadow-hover: 0 4px 20px rgba(0, 0, 0, 0.15);
    
    /* Typography */
    --font-primary: 'Fredoka One', cursive;
    --font-secondary: 'Open Sans', sans-serif;
    
    /* Spacing */
    --spacing-xs: 0.5rem;
    --spacing-sm: 1rem;
    --spacing-md: 1.5rem;
    --spacing-lg: 2rem;
    --spacing-xl: 3rem;
    
    /* Breakpoints */
    --mobile: 768px;
    --tablet: 1024px;
}

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

/* Navigation */
.navbar {
    background: linear-gradient(135deg, var(--primary-color), var(--secondary-color));
    color: white;
    padding: var(--spacing-sm) 0;
    box-shadow: var(--shadow);
    position: sticky;
    top: 0;
    z-index: 1000;
}

.nav-container {
    max-width: 1200px;
    margin: 0 auto;
    padding: 0 var(--spacing-sm);
    display: flex;
    justify-content: space-between;
    align-items: center;
    flex-wrap: wrap;
    gap: var(--spacing-sm);
}

.nav-title {
    font-family: var(--font-primary);
    font-size: 1.8rem;
    margin: 0;
}

.nav-controls {
    display: flex;
    align-items: center;
    gap: var(--spacing-sm);
    flex-wrap: wrap;
}

.home-btn, .restart-btn {
    background: rgba(255, 255, 255, 0.2);
    border: 2px solid rgba(255, 255, 255, 0.3);
    color: white;
    padding: var(--spacing-sm) var(--spacing-md);
    border-radius: 25px;
    cursor: pointer;
    font-weight: 600;
    transition: all 0.3s ease;
    font-size: 1rem;
    min-height: 44px; /* Minimum touch target size */
    min-width: 80px;
}

.home-btn:hover, .restart-btn:hover {
    background: rgba(255, 255, 255, 0.3);
    transform: translateY(-2px);
}

.language-toggle {
    display: flex;
    background: rgba(255, 255, 255, 0.2);
    border-radius: 20px;
    overflow: hidden;
}

.lang-btn {
    background: transparent;
    border: none;
    color: white;
    padding: var(--spacing-xs) var(--spacing-sm);
    cursor: pointer;
    transition: all 0.3s ease;
    font-weight: 600;
    font-size: 0.85rem;
}

.lang-btn.active, .lang-btn:hover {
    background: rgba(255, 255, 255, 0.3);
}

/* Main Container */
.main-container {
    max-width: 1200px;
    margin: 0 auto;
    padding: var(--spacing-lg) var(--spacing-sm);
    min-height: calc(100vh - 80px);
}

/* Page System */
.page {
    display: none;
    animation: fadeIn 0.5s ease-in-out;
}

.page.active {
    display: block;
}

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

/* Welcome Section */
.welcome-section {
    text-align: center;
    margin-bottom: var(--spacing-xl);
}

.main-title {
    font-family: var(--font-primary);
    font-size: clamp(2rem, 5vw, 3.5rem);
    color: var(--primary-color);
    margin-bottom: var(--spacing-sm);
    text-shadow: 2px 2px 4px rgba(0, 0, 0, 0.1);
}

.main-subtitle {
    font-size: clamp(1rem, 3vw, 1.25rem);
    color: var(--text-light);
    max-width: 600px;
    margin: 0 auto;
}

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

.game-card {
    background: var(--card-background);
    border-radius: 20px;
    padding: var(--spacing-lg);
    text-align: center;
    box-shadow: var(--shadow);
    transition: all 0.3s ease;
    cursor: pointer;
    position: relative;
    overflow: hidden;
}

/* Fraction Forest Run (canvas wrapper) */
.ffr-container {
    max-width: 1000px;
    margin: 0 auto;
    padding: 1rem;
}

.ffr-hud {
    display: flex;
    justify-content: space-around;
    align-items: center;
    background: rgba(255, 255, 255, 0.9);
    padding: 0.75rem 1rem;
    border-radius: 8px;
    margin-bottom: 1rem;
    font-weight: 600;
    font-size: 1.1rem;
    box-shadow: var(--shadow);
}

.ffr-hud > div {
    padding: 0 1rem;
}

.ffr-game-wrapper {
    display: flex;
    align-items: center;
    justify-content: center;
    gap: 1rem;
    margin-bottom: 1rem;
}

#ffrCanvas {
    display: block;
    border: 3px solid var(--primary-color);
    border-radius: 8px;
    box-shadow: var(--shadow);
    background: #a8e6ff;
}

.ffr-controls-left,
.ffr-controls-right {
    display: flex;
    flex-direction: column;
    gap: 0.5rem;
}

.ffr-controls-center {
    text-align: center;
}

.ffr-controls .btn {
    padding: 1rem 1.5rem;
    font-size: 1.2rem;
    min-width: 60px;
    min-height: 60px;
}

@media (max-width: 768px) {
    .ffr-game-wrapper {
        flex-direction: column;
    }
    
    .ffr-controls-left,
    .ffr-controls-right {
        flex-direction: row;
    }
    
    #ffrCanvas {
        max-width: 100%;
        height: auto;
    }
}

/* Galaxy Math Defender (canvas wrapper) */
.gmd-container {
    max-width: 1000px;
    margin: 0 auto;
    padding: 1rem;
}

.gmd-hud {
    display: flex;
    justify-content: space-around;
    align-items: center;
    background: rgba(255, 255, 255, 0.9);
    padding: 0.75rem 1rem;
    border-radius: 8px;
    margin-bottom: 1rem;
    font-weight: 600;
    font-size: 1.1rem;
    box-shadow: var(--shadow);
}

.gmd-hud > div {
    padding: 0 1rem;
}

.gmd-game-wrapper {
    display: flex;
    align-items: center;
    justify-content: center;
    gap: 1rem;
    margin-bottom: 1rem;
}

#gmdCanvas {
    display: block;
    border: 3px solid var(--secondary-color);
    border-radius: 8px;
    box-shadow: var(--shadow);
    background: #000428;
}

.gmd-controls-left,
.gmd-controls-right {
    display: flex;
    flex-direction: column;
    gap: 0.5rem;
}

.gmd-controls-center {
    text-align: center;
}

.gmd-controls .btn {
    padding: 1rem 1.5rem;
    font-size: 1.2rem;
    min-width: 60px;
    min-height: 60px;
}

@media (max-width: 768px) {
    .gmd-game-wrapper {
        flex-direction: column;
    }
    
    .gmd-controls-left,
    .gmd-controls-right {
        flex-direction: row;
    }
    
    #gmdCanvas {
        max-width: 100%;
        height: auto;
    }
}

.gmd-controls .btn {
    margin: 0 0.25rem;
}

.game-card::before {
    content: '';
    position: absolute;
    top: -50%;
    left: -50%;
    width: 200%;
    height: 200%;
    background: linear-gradient(45deg, transparent, rgba(76, 175, 80, 0.1), transparent);
    transition: transform 0.6s ease;
    transform: translateX(-100%) translateY(-100%) rotate(45deg);
}

.game-card:hover::before {
    transform: translateX(0) translateY(0) rotate(45deg);
}

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

.game-icon {
    font-size: 3rem;
    margin-bottom: var(--spacing-sm);
    display: block;
    position: relative;
    z-index: 1;
}

.game-card h3 {
    font-family: var(--font-primary);
    font-size: 1.5rem;
    color: var(--primary-color);
    margin-bottom: var(--spacing-sm);
    position: relative;
    z-index: 1;
}

.game-card p {
    color: var(--text-light);
    margin-bottom: var(--spacing-md);
    position: relative;
    z-index: 1;
}

.grade-level {
    background: linear-gradient(135deg, var(--accent-color), var(--warning-color));
    color: white;
    padding: var(--spacing-xs) var(--spacing-sm);
    border-radius: 15px;
    font-size: 0.85rem;
    font-weight: 600;
    display: inline-block;
    position: relative;
    z-index: 1;
}

/* Game Page Styles */
.game-page {
    background: var(--card-background);
    border-radius: 20px;
    padding: var(--spacing-lg);
    box-shadow: var(--shadow);
    min-height: 600px;
}

.game-header {
    text-align: center;
    margin-bottom: var(--spacing-lg);
    padding-bottom: var(--spacing-md);
    border-bottom: 2px solid var(--border-color);
}

.game-title {
    font-family: var(--font-primary);
    font-size: 2.5rem;
    color: var(--primary-color);
    margin-bottom: var(--spacing-sm);
}

.game-score {
    background: linear-gradient(135deg, var(--secondary-color), var(--primary-color));
    color: white;
    padding: var(--spacing-sm) var(--spacing-md);
    border-radius: 25px;
    font-weight: 600;
    display: inline-block;
    margin-bottom: var(--spacing-sm);
}

.difficulty-selector {
    display: flex;
    gap: var(--spacing-sm);
    justify-content: center;
    margin-bottom: var(--spacing-md);
    flex-wrap: wrap;
}

.difficulty-btn {
    background: var(--border-color);
    border: none;
    padding: var(--spacing-sm) var(--spacing-lg);
    border-radius: 20px;
    cursor: pointer;
    transition: all 0.3s ease;
    font-weight: 600;
    font-size: 1rem;
    min-height: 50px; /* Bigger for young children */
    min-width: 90px;
}

.difficulty-btn.active {
    background: var(--accent-color);
    color: white;
}

.difficulty-btn:hover {
    transform: translateY(-2px);
}

/* Common Game Elements */
.game-area {
    background: var(--background-color);
    border-radius: 15px;
    padding: var(--spacing-lg);
    margin: var(--spacing-md) 0;
    min-height: 400px;
    position: relative;
}

.game-controls {
    display: flex;
    gap: var(--spacing-sm);
    justify-content: center;
    margin: var(--spacing-md) 0;
    flex-wrap: wrap;
}

.btn {
    background: var(--primary-color);
    color: white;
    border: none;
    padding: var(--spacing-md) var(--spacing-lg);
    border-radius: 25px;
    cursor: pointer;
    font-weight: 600;
    font-size: 1.1rem;
    transition: all 0.3s ease;
    min-width: 140px;
    min-height: 50px; /* Minimum touch target for young children */
}

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

.btn:disabled {
    background: var(--border-color);
    cursor: not-allowed;
    transform: none;
}

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

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

.btn-danger {
    background: var(--error-color);
}

.btn-danger:hover {
    background: #D32F2F;
}

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

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

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

@keyframes correctAnswer {
    0% { transform: scale(1); background-color: var(--card-background); }
    50% { transform: scale(1.1); background-color: var(--success-color); color: white; }
    100% { transform: scale(1); background-color: var(--card-background); }
}

@keyframes wrongAnswer {
    0% { transform: translateX(0); background-color: var(--card-background); }
    25% { transform: translateX(-5px); background-color: var(--error-color); color: white; }
    50% { transform: translateX(5px); }
    75% { transform: translateX(-2px); }
    100% { transform: translateX(0); background-color: var(--card-background); }
}

.correct {
    animation: correctAnswer 0.6s ease-in-out;
}

.wrong {
    animation: wrongAnswer 0.6s ease-in-out;
}

.bounce {
    animation: bounce 0.6s ease-in-out;
}

.pulse {
    animation: pulse 1s ease-in-out infinite;
}

.try-again-message {
    background: linear-gradient(135deg, #FFB74D, #FFA726);
    color: white;
    padding: var(--spacing-md);
    border-radius: 15px;
    font-size: 1.3rem;
    font-weight: 600;
    text-align: center;
    box-shadow: 0 4px 15px rgba(0, 0, 0, 0.2);
    animation: pulse 1s ease-in-out;
}

.smaller {
    font-size: 0.9em;
    display: block;
    margin-top: 0.5rem;
}

/* Touch and Mobile Optimizations */
@media (max-width: 768px) {
    .nav-container {
        flex-direction: column;
        gap: var(--spacing-sm);
    }
    
    .nav-controls {
        width: 100%;
        justify-content: center;
    }
    
    .main-container {
        padding: var(--spacing-md) var(--spacing-sm);
    }
    
    .games-grid {
        grid-template-columns: 1fr;
        gap: var(--spacing-md);
    }
    
    .game-card {
        padding: var(--spacing-md);
    }
    
    .btn {
        min-width: 100px;
        padding: var(--spacing-sm) var(--spacing-md);
    }
}

/* Touch-friendly sizing */
@media (hover: none) and (pointer: coarse) {
    .btn, .game-card, .lang-btn, .home-btn, .restart-btn {
        min-height: 44px;
        min-width: 44px;
    }
    
    .game-card {
        padding: var(--spacing-lg);
    }
}

/* High contrast mode support */
@media (prefers-contrast: high) {
    :root {
        --border-color: #000000;
        --text-light: #000000;
        --shadow: 0 2px 10px rgba(0, 0, 0, 0.3);
    }
}

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

/* Print styles */
@media print {
    .navbar, .nav-controls, .game-controls {
        display: none;
    }
    
    .main-container {
        max-width: none;
        margin: 0;
        padding: 0;
    }
    
    .game-page {
        box-shadow: none;
        border: 1px solid #000;
    }
}