/*
 * Offszn Education - Main Stylesheet
 * Theme: Warm Sunshine & Ocean - Bold, kid-friendly with inviting warmth
 */

/* ============================================
   CSS CUSTOM PROPERTIES
   ============================================ */
:root {
    /* Primary Palette - Warm Coral/Sunset */
    --primary: #E85A4F;
    --primary-light: #FF8A80;
    --primary-dark: #C94840;
    --primary-glow: rgba(232, 90, 79, 0.3);

    /* Secondary - Ocean Teal */
    --secondary: #4ECDC4;
    --secondary-light: #7EEAEA;
    --secondary-dark: #3DB8B0;

    /* Accent - Sunny Yellow */
    --accent: #FECA57;
    --accent-light: #FFE08A;
    --accent-dark: #F5B740;

    /* Subject Colors */
    --reading: #E85A4F;
    --reading-light: #FF8A80;
    --reading-bg: rgba(232, 90, 79, 0.1);

    --math: #4ECDC4;
    --math-light: #7EEAEA;
    --math-bg: rgba(78, 205, 196, 0.1);

    /* Success/Error States */
    --success: #26DE81;
    --success-light: #7BF5B3;
    --success-bg: rgba(38, 222, 129, 0.15);

    --error: #FC5C65;
    --error-light: #FD9CA1;
    --error-bg: rgba(252, 92, 101, 0.15);

    /* Neutrals - Warm peachy undertones */
    --bg-primary: #FFF9F5;
    --bg-secondary: #FFF5EE;
    --bg-tertiary: #FFEEE5;
    --surface: #FFFFFF;
    --surface-hover: #FFFAF7;

    --text-primary: #2D3436;
    --text-secondary: #636E72;
    --text-muted: #B2BEC3;
    --text-inverse: #FFFFFF;

    /* Borders & Shadows */
    --border-light: rgba(45, 52, 54, 0.08);
    --border-medium: rgba(45, 52, 54, 0.15);

    --shadow-xs: 0 1px 3px rgba(45, 52, 54, 0.06);
    --shadow-sm: 0 2px 8px rgba(45, 52, 54, 0.08);
    --shadow-md: 0 4px 16px rgba(45, 52, 54, 0.1);
    --shadow-lg: 0 8px 32px rgba(45, 52, 54, 0.12);
    --shadow-xl: 0 16px 48px rgba(45, 52, 54, 0.16);
    --shadow-glow: 0 0 40px var(--primary-glow);

    /* Radii - Extra rounded for playful feel */
    --radius-sm: 8px;
    --radius-md: 12px;
    --radius-lg: 16px;
    --radius-xl: 24px;
    --radius-2xl: 32px;
    --radius-full: 9999px;

    /* Touch Targets (WCAG) */
    --touch-min: 48px;
    --touch-preferred: 56px;
    --touch-large: 72px;

    /* Spacing Scale */
    --space-xs: 4px;
    --space-sm: 8px;
    --space-md: 16px;
    --space-lg: 24px;
    --space-xl: 32px;
    --space-2xl: 48px;
    --space-3xl: 64px;

    /* Typography */
    --font-display: 'Fredoka', 'Nunito', sans-serif;
    --font-body: 'Nunito', -apple-system, BlinkMacSystemFont, sans-serif;
    --font-mono: 'JetBrains Mono', 'Fira Code', monospace;

    /* Transitions */
    --transition-fast: 150ms ease;
    --transition-base: 250ms ease;
    --transition-slow: 400ms ease;
    --transition-bounce: 500ms cubic-bezier(0.34, 1.56, 0.64, 1);
}

/* Dark mode support */
@media (prefers-color-scheme: dark) {
    :root {
        --bg-primary: #1A1A1F;
        --bg-secondary: #252528;
        --bg-tertiary: #2F2F34;
        --surface: #2A2A2F;
        --surface-hover: #353538;

        --text-primary: #F5F3F7;
        --text-secondary: #C5C1CC;
        --text-muted: #918D99;

        --border-light: rgba(255, 255, 255, 0.12);
        --border-medium: rgba(255, 255, 255, 0.2);

        --shadow-sm: 0 2px 8px rgba(0, 0, 0, 0.3);
        --shadow-md: 0 4px 16px rgba(0, 0, 0, 0.4);
        --shadow-lg: 0 8px 32px rgba(0, 0, 0, 0.5);
    }
}

/* ============================================
   BASE STYLES
   ============================================ */
*, *::before, *::after {
    box-sizing: border-box;
}

html {
    font-size: 16px;
    scroll-behavior: smooth;
    -webkit-font-smoothing: antialiased;
    -moz-osx-font-smoothing: grayscale;
}

body {
    margin: 0;
    padding: 0;
    font-family: var(--font-body);
    font-size: 1rem;
    line-height: 1.6;
    color: var(--text-primary);
    background: var(--bg-primary);
    min-height: 100vh;
}

/* Playful background pattern */
body::before {
    content: '';
    position: fixed;
    top: 0;
    left: 0;
    right: 0;
    bottom: 0;
    background-image:
        radial-gradient(circle at 20% 80%, var(--primary-glow) 0%, transparent 50%),
        radial-gradient(circle at 80% 20%, rgba(0, 210, 211, 0.1) 0%, transparent 50%),
        radial-gradient(circle at 40% 40%, rgba(254, 202, 87, 0.08) 0%, transparent 40%);
    pointer-events: none;
    z-index: -1;
}

/* ============================================
   TYPOGRAPHY
   ============================================ */
h1, h2, h3, h4, h5, h6 {
    font-family: var(--font-display);
    font-weight: 600;
    line-height: 1.2;
    margin: 0 0 var(--space-md);
    color: var(--text-primary);
}

h1 {
    font-size: clamp(2rem, 5vw, 3rem);
    font-weight: 700;
    letter-spacing: -0.02em;
}

h2 {
    font-size: clamp(1.5rem, 4vw, 2.25rem);
    font-weight: 600;
}

h3 {
    font-size: clamp(1.25rem, 3vw, 1.5rem);
}

h4 {
    font-size: 1.125rem;
}

p {
    margin: 0 0 var(--space-md);
    color: var(--text-secondary);
}

a {
    color: var(--primary);
    text-decoration: none;
    transition: color var(--transition-fast);
}

a:hover {
    color: var(--primary-dark);
}

/* ============================================
   LAYOUT COMPONENTS
   ============================================ */
.container {
    width: 100%;
    max-width: 1200px;
    margin: 0 auto;
    padding: 0 var(--space-lg);
}

.container-sm {
    max-width: 600px;
}

.container-lg {
    max-width: 1400px;
}

/* Grid System */
.grid {
    display: grid;
    gap: var(--space-lg);
}

.grid-2 { grid-template-columns: repeat(2, 1fr); }
.grid-3 { grid-template-columns: repeat(3, 1fr); }
.grid-4 { grid-template-columns: repeat(4, 1fr); }

@media (max-width: 768px) {
    .grid-2, .grid-3, .grid-4 {
        grid-template-columns: 1fr;
    }
}

/* Flex Utilities */
.flex { display: flex; }
.flex-col { flex-direction: column; }
.flex-wrap { flex-wrap: wrap; }
.items-center { align-items: center; }
.items-start { align-items: flex-start; }
.justify-center { justify-content: center; }
.justify-between { justify-content: space-between; }
.gap-sm { gap: var(--space-sm); }
.gap-md { gap: var(--space-md); }
.gap-lg { gap: var(--space-lg); }

/* ============================================
   NAVIGATION
   ============================================ */
.navbar {
    position: sticky;
    top: 0;
    z-index: 100;
    background: rgba(254, 252, 251, 0.95);
    backdrop-filter: blur(20px);
    -webkit-backdrop-filter: blur(20px);
    border-bottom: 1px solid var(--border-light);
    padding: var(--space-md) 0;
}

@media (prefers-color-scheme: dark) {
    .navbar {
        background: rgba(26, 22, 37, 0.95);
        border-bottom: 1px solid rgba(255, 255, 255, 0.1);
    }
}

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

.navbar-brand {
    display: flex;
    align-items: center;
    gap: var(--space-sm);
    font-family: var(--font-display);
    font-size: 1.5rem;
    font-weight: 700;
    color: var(--text-primary);
    text-decoration: none;
}

.navbar-brand-icon {
    width: 40px;
    height: 40px;
    background: linear-gradient(135deg, var(--primary), var(--secondary));
    border-radius: var(--radius-lg);
    display: flex;
    align-items: center;
    justify-content: center;
    font-size: 1.25rem;
    box-shadow: var(--shadow-sm);
}

.navbar-nav {
    display: flex;
    align-items: center;
    gap: var(--space-md);
    list-style: none;
    margin: 0;
    padding: 0;
}

.nav-link {
    display: flex;
    align-items: center;
    gap: var(--space-xs);
    padding: var(--space-sm) var(--space-md);
    border-radius: var(--radius-lg);
    color: var(--text-secondary);
    font-weight: 600;
    font-size: 0.9rem;
    transition: all var(--transition-fast);
}

/* Dashboard - Red/Coral */
.nav-link-dashboard {
    background: var(--secondary);
    color: var(--text-inverse);
}

.nav-link-dashboard:hover {
    background: var(--secondary-dark);
    color: var(--text-inverse);
}

/* Children - Purple */
.nav-link-children {
    background: var(--primary);
    color: var(--text-inverse);
}

.nav-link-children:hover {
    background: var(--primary-dark);
    color: var(--text-inverse);
}

/* Settings - Dark */
.nav-link-settings {
    background: var(--bg-tertiary);
    color: var(--text-primary);
}

.nav-link-settings:hover {
    background: var(--border-medium);
    color: var(--text-primary);
}

/* Logout - Transparent with accent color */
.nav-link-logout {
    background: transparent;
    color: var(--accent);
    border: 1px solid var(--accent);
}

.nav-link-logout:hover {
    background: var(--accent);
    color: var(--text-primary);
}

@media (prefers-color-scheme: dark) {
    .nav-link-settings {
        background: rgba(255, 255, 255, 0.1);
        color: var(--text-primary);
    }

    .nav-link-settings:hover {
        background: rgba(255, 255, 255, 0.15);
    }
}

/* ============================================
   TREASURE CARNIVAL - COIN DISPLAY
   ============================================ */
.nav-coin-display {
    display: flex;
    align-items: center;
}

.coin-badge {
    position: relative;
    display: flex;
    align-items: center;
    gap: 0.35rem;
    background:
        linear-gradient(180deg, #FFE66D 0%, #FFD700 40%, #F7931E 100%);
    padding: 0.4rem 0.9rem 0.4rem 0.6rem;
    border-radius: 100px;
    font-family: 'Baloo 2', 'Fredoka', cursive;
    font-weight: 700;
    font-size: 0.95rem;
    color: #5D3A00;
    text-shadow: 0 1px 0 rgba(255, 255, 255, 0.3);
    box-shadow:
        0 3px 0 #B8860B,
        0 4px 8px rgba(184, 134, 11, 0.3),
        inset 0 1px 0 rgba(255, 255, 255, 0.4);
    cursor: default;
    transition: all 0.2s ease;
    overflow: hidden;
}

/* Shine effect */
.coin-badge::before {
    content: '';
    position: absolute;
    top: 0;
    left: -100%;
    width: 50%;
    height: 100%;
    background: linear-gradient(
        90deg,
        transparent,
        rgba(255, 255, 255, 0.4),
        transparent
    );
    animation: coinBadgeShine 4s ease-in-out infinite;
}

@keyframes coinBadgeShine {
    0%, 70%, 100% { left: -100%; }
    85% { left: 150%; }
}

.coin-badge:hover {
    transform: translateY(-2px);
    box-shadow:
        0 5px 0 #B8860B,
        0 6px 12px rgba(184, 134, 11, 0.4),
        inset 0 1px 0 rgba(255, 255, 255, 0.4);
}

.coin-badge:active {
    transform: translateY(1px);
    box-shadow:
        0 2px 0 #B8860B,
        0 3px 6px rgba(184, 134, 11, 0.3),
        inset 0 1px 0 rgba(255, 255, 255, 0.4);
}

.coin-icon {
    font-size: 1.2rem;
    filter: drop-shadow(0 1px 2px rgba(0, 0, 0, 0.2));
    animation: coinIconFloat 2s ease-in-out infinite;
}

@keyframes coinIconFloat {
    0%, 100% { transform: translateY(0) rotate(0deg); }
    50% { transform: translateY(-2px) rotate(5deg); }
}

.coin-count {
    min-width: 1.5rem;
    text-align: center;
    font-size: 1rem;
    letter-spacing: 0.02em;
}

/* Coin earned animation - treasure burst */
.coin-badge.coin-earned {
    animation: coinEarnedBurst 0.6s cubic-bezier(0.34, 1.56, 0.64, 1);
}

@keyframes coinEarnedBurst {
    0% { transform: scale(1); }
    30% { transform: scale(1.3) rotate(-5deg); }
    50% { transform: scale(1.2) rotate(3deg); }
    70% { transform: scale(1.15) rotate(-2deg); }
    100% { transform: scale(1) rotate(0deg); }
}

/* Coin count change animation */
.coin-count.updating {
    animation: countPop 0.4s cubic-bezier(0.34, 1.56, 0.64, 1);
}

@keyframes countPop {
    0%, 100% { transform: scale(1); }
    50% { transform: scale(1.3); color: #FF6B35; }
}

/* Responsive adjustments */
@media (max-width: 480px) {
    .coin-badge {
        padding: 0.35rem 0.7rem 0.35rem 0.5rem;
        font-size: 0.85rem;
    }

    .coin-icon {
        font-size: 1rem;
    }
}

/* ============================================
   BUTTONS
   ============================================ */
.btn {
    display: inline-flex;
    align-items: center;
    justify-content: center;
    gap: var(--space-sm);
    padding: var(--space-md) var(--space-xl);
    min-height: var(--touch-min);
    font-family: var(--font-body);
    font-size: 1rem;
    font-weight: 600;
    text-decoration: none;
    border: none;
    border-radius: var(--radius-full);
    cursor: pointer;
    transition: all var(--transition-base);
    position: relative;
    overflow: hidden;
}

.btn::before {
    content: '';
    position: absolute;
    inset: 0;
    background: linear-gradient(135deg, rgba(255,255,255,0.2), transparent);
    opacity: 0;
    transition: opacity var(--transition-fast);
}

.btn:hover::before {
    opacity: 1;
}

.btn:active {
    transform: scale(0.97);
}

/* Primary Button */
.btn-primary {
    background: linear-gradient(135deg, var(--primary), var(--primary-dark));
    color: var(--text-inverse);
    box-shadow: var(--shadow-md), 0 4px 12px var(--primary-glow);
}

.btn-primary:hover {
    transform: translateY(-2px);
    box-shadow: var(--shadow-lg), 0 8px 24px var(--primary-glow);
}

/* Secondary Button */
.btn-secondary {
    background: var(--surface);
    color: var(--text-primary);
    border: 2px solid var(--border-medium);
}

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

/* Accent Button */
.btn-accent {
    background: linear-gradient(135deg, var(--secondary), var(--secondary-dark));
    color: var(--text-inverse);
    box-shadow: var(--shadow-md);
}

/* Success Button */
.btn-success {
    background: linear-gradient(135deg, var(--success), #20C574);
    color: var(--text-inverse);
}

/* Large Button (for children) */
.btn-lg {
    padding: var(--space-lg) var(--space-2xl);
    min-height: var(--touch-large);
    font-size: 1.25rem;
    border-radius: var(--radius-2xl);
}

/* Icon Button */
.btn-icon {
    width: var(--touch-min);
    height: var(--touch-min);
    padding: 0;
    border-radius: var(--radius-lg);
}

/* ============================================
   CARDS
   ============================================ */
.card {
    background: var(--surface);
    border-radius: var(--radius-xl);
    padding: var(--space-xl);
    box-shadow: var(--shadow-sm);
    border: 1px solid var(--border-light);
    transition: all var(--transition-base);
}

.card:hover {
    box-shadow: var(--shadow-md);
    transform: translateY(-2px);
}

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

.card-title {
    font-family: var(--font-display);
    font-size: 1.25rem;
    font-weight: 600;
    margin: 0;
}

.card-body {
    color: var(--text-secondary);
}

.card-footer {
    margin-top: var(--space-lg);
    padding-top: var(--space-lg);
    border-top: 1px solid var(--border-light);
}

/* Game Card - Special styling for game tiles */
.game-card {
    position: relative;
    padding: var(--space-xl);
    border-radius: var(--radius-2xl);
    background: var(--surface);
    border: 2px solid var(--border-light);
    cursor: pointer;
    transition: all var(--transition-bounce);
    overflow: hidden;
}

.game-card::before {
    content: '';
    position: absolute;
    top: -50%;
    left: -50%;
    width: 200%;
    height: 200%;
    background: radial-gradient(circle, var(--primary-glow) 0%, transparent 70%);
    opacity: 0;
    transition: opacity var(--transition-base);
}

.game-card:hover {
    transform: translateY(-4px) scale(1.02);
    border-color: var(--primary);
    box-shadow: var(--shadow-lg), var(--shadow-glow);
}

.game-card:hover::before {
    opacity: 1;
}

.game-card-icon {
    width: 64px;
    height: 64px;
    display: flex;
    align-items: center;
    justify-content: center;
    font-size: 2rem;
    background: var(--bg-secondary);
    border-radius: var(--radius-xl);
    margin-bottom: var(--space-md);
    transition: transform var(--transition-bounce);
}

.game-card:hover .game-card-icon {
    transform: scale(1.1) rotate(-5deg);
}

.game-card-title {
    font-family: var(--font-display);
    font-size: 1.125rem;
    font-weight: 600;
    margin: 0 0 var(--space-xs);
}

.game-card-desc {
    font-size: 0.875rem;
    color: var(--text-muted);
    margin: 0;
}

/* Category badges on game cards */
.game-card.reading {
    --card-accent: var(--reading);
}

.game-card.math {
    --card-accent: var(--math);
}

.game-card .game-card-icon {
    background: linear-gradient(135deg, var(--card-accent, var(--primary)), rgba(var(--card-accent), 0.7));
}

/* ============================================
   FORMS
   ============================================ */
.form-group {
    margin-bottom: var(--space-lg);
}

.form-label {
    display: block;
    font-weight: 600;
    margin-bottom: var(--space-sm);
    color: var(--text-primary);
}

.form-input {
    width: 100%;
    padding: var(--space-md) var(--space-lg);
    min-height: var(--touch-min);
    font-family: var(--font-body);
    font-size: 1rem;
    color: var(--text-primary);
    background: var(--surface);
    border: 2px solid var(--border-medium);
    border-radius: var(--radius-lg);
    transition: all var(--transition-fast);
    outline: none;
}

.form-input:focus {
    border-color: var(--primary);
    box-shadow: 0 0 0 4px var(--primary-glow);
}

.form-input::placeholder {
    color: var(--text-muted);
}

.form-input-lg {
    padding: var(--space-lg);
    min-height: var(--touch-preferred);
    font-size: 1.125rem;
    border-radius: var(--radius-xl);
}

/* Select */
.form-select {
    appearance: none;
    background-image: url("data:image/svg+xml,%3Csvg xmlns='http://www.w3.org/2000/svg' width='24' height='24' viewBox='0 0 24 24' fill='none' stroke='%23636E72' stroke-width='2' stroke-linecap='round' stroke-linejoin='round'%3E%3Cpolyline points='6 9 12 15 18 9'%3E%3C/polyline%3E%3C/svg%3E");
    background-repeat: no-repeat;
    background-position: right var(--space-md) center;
    background-size: 20px;
    padding-right: var(--space-2xl);
}

/* Checkbox */
.form-check {
    display: flex;
    align-items: center;
    gap: var(--space-sm);
    cursor: pointer;
}

.form-check-input {
    width: 24px;
    height: 24px;
    accent-color: var(--primary);
    cursor: pointer;
}

/* ============================================
   PROGRESS & STATS
   ============================================ */
.progress-bar {
    height: 12px;
    background: var(--bg-tertiary);
    border-radius: var(--radius-full);
    overflow: hidden;
}

.progress-fill {
    height: 100%;
    border-radius: var(--radius-full);
    transition: width var(--transition-slow);
    background: linear-gradient(90deg, var(--primary), var(--primary-light));
}

.progress-fill.reading {
    background: linear-gradient(90deg, var(--reading), var(--reading-light));
}

.progress-fill.math {
    background: linear-gradient(90deg, var(--math), var(--math-light));
}

/* Stat Card */
.stat-card {
    text-align: center;
    padding: var(--space-xl);
    background: var(--surface);
    border-radius: var(--radius-xl);
    border: 1px solid var(--border-light);
}

.stat-value {
    font-family: var(--font-display);
    font-size: 2.5rem;
    font-weight: 700;
    color: var(--primary);
    line-height: 1;
    margin-bottom: var(--space-xs);
}

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

/* ============================================
   AVATARS
   ============================================ */
.avatar {
    width: 48px;
    height: 48px;
    border-radius: var(--radius-full);
    display: flex;
    align-items: center;
    justify-content: center;
    font-size: 1.5rem;
    background: linear-gradient(135deg, var(--primary-light), var(--primary));
    color: var(--text-inverse);
    flex-shrink: 0;
}

.avatar-sm {
    width: 32px;
    height: 32px;
    font-size: 1rem;
}

.avatar-lg {
    width: 72px;
    height: 72px;
    font-size: 2rem;
}

.avatar-xl {
    width: 96px;
    height: 96px;
    font-size: 2.5rem;
}

/* ============================================
   BADGES
   ============================================ */
.badge {
    display: inline-flex;
    align-items: center;
    gap: var(--space-xs);
    padding: var(--space-xs) var(--space-md);
    font-size: 0.75rem;
    font-weight: 600;
    text-transform: uppercase;
    letter-spacing: 0.05em;
    border-radius: var(--radius-full);
    background: var(--bg-secondary);
    color: var(--text-secondary);
}

.badge-primary {
    background: var(--primary-glow);
    color: var(--primary);
}

.badge-success {
    background: var(--success-bg);
    color: var(--success);
}

.badge-reading {
    background: var(--reading-bg);
    color: var(--reading);
}

.badge-math {
    background: var(--math-bg);
    color: var(--math);
}

/* ============================================
   ALERTS & MESSAGES
   ============================================ */
.alert {
    padding: var(--space-md) var(--space-lg);
    border-radius: var(--radius-lg);
    margin-bottom: var(--space-lg);
    display: flex;
    align-items: center;
    gap: var(--space-md);
}

.alert-success {
    background: var(--success-bg);
    color: #1A7F4B;
    border: 1px solid rgba(38, 222, 129, 0.3);
}

.alert-error {
    background: var(--error-bg);
    color: #B33A3A;
    border: 1px solid rgba(252, 92, 101, 0.3);
}

.alert-info {
    background: var(--primary-glow);
    color: var(--primary-dark);
    border: 1px solid rgba(108, 92, 231, 0.3);
}

/* ============================================
   GAME UI COMPONENTS
   ============================================ */
.game-header {
    display: flex;
    align-items: center;
    justify-content: space-between;
    padding: var(--space-md) var(--space-lg);
    background: rgba(255, 255, 255, 0.95);
    backdrop-filter: blur(10px);
    border-radius: var(--radius-2xl);
    margin-bottom: var(--space-lg);
    box-shadow: var(--shadow-sm);
}

.game-stat {
    display: flex;
    flex-direction: column;
    align-items: center;
    padding: 0 var(--space-md);
}

.game-stat-value {
    font-family: var(--font-display);
    font-size: 1.5rem;
    font-weight: 700;
    color: var(--text-primary);
    line-height: 1;
}

.game-stat-label {
    font-size: 0.75rem;
    color: var(--text-muted);
    text-transform: uppercase;
}

/* Question Display */
.question-container {
    text-align: center;
    padding: var(--space-3xl);
    background: var(--surface);
    border-radius: var(--radius-2xl);
    box-shadow: var(--shadow-md);
    margin-bottom: var(--space-xl);
}

.question-text {
    font-family: var(--font-display);
    font-size: clamp(2rem, 8vw, 4rem);
    font-weight: 700;
    color: var(--text-primary);
    margin: 0;
}

/* Answer Options */
.answer-grid {
    display: grid;
    grid-template-columns: repeat(2, 1fr);
    gap: var(--space-md);
    max-width: 500px;
    margin: 0 auto;
}

.answer-btn {
    padding: var(--space-xl);
    min-height: var(--touch-large);
    font-family: var(--font-display);
    font-size: 1.75rem;
    font-weight: 700;
    color: var(--text-primary);
    background: var(--surface);
    border: 3px solid var(--border-medium);
    border-radius: var(--radius-2xl);
    cursor: pointer;
    transition: all var(--transition-bounce);
}

.answer-btn:hover {
    border-color: var(--primary);
    transform: scale(1.05);
    box-shadow: var(--shadow-md);
}

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

.answer-btn.correct {
    background: var(--success-bg);
    border-color: var(--success);
    color: var(--success);
    animation: correct-pulse 0.5s ease;
}

.answer-btn.incorrect {
    background: var(--error-bg);
    border-color: var(--error);
    color: var(--error);
    animation: shake 0.5s ease;
}

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

@keyframes shake {
    0%, 100% { transform: translateX(0); }
    25% { transform: translateX(-8px); }
    75% { transform: translateX(8px); }
}

/* ============================================
   DASHBOARD SECTIONS
   ============================================ */
.dashboard-section {
    margin-bottom: var(--space-2xl);
}

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

.section-title {
    font-family: var(--font-display);
    font-size: 1.5rem;
    font-weight: 600;
    margin: 0;
    display: flex;
    align-items: center;
    gap: var(--space-sm);
}

/* Child selector */
.child-selector {
    display: flex;
    gap: var(--space-md);
    flex-wrap: wrap;
}

.child-card {
    display: flex;
    align-items: center;
    gap: var(--space-md);
    padding: var(--space-md) var(--space-lg);
    background: var(--surface);
    border: 2px solid var(--border-light);
    border-radius: var(--radius-xl);
    cursor: pointer;
    transition: all var(--transition-base);
}

.child-card:hover {
    border-color: var(--primary);
    box-shadow: var(--shadow-md);
}

.child-card.active {
    border-color: var(--primary);
    background: var(--primary-glow);
}

/* ============================================
   ACHIEVEMENT BADGES
   ============================================ */
.achievement {
    display: flex;
    align-items: center;
    gap: var(--space-md);
    padding: var(--space-md);
    background: var(--surface);
    border-radius: var(--radius-lg);
    border: 1px solid var(--border-light);
}

.achievement-icon {
    width: 48px;
    height: 48px;
    display: flex;
    align-items: center;
    justify-content: center;
    font-size: 1.5rem;
    background: var(--accent-light);
    border-radius: var(--radius-lg);
}

.achievement-info {
    flex: 1;
}

.achievement-name {
    font-weight: 600;
    margin: 0 0 var(--space-xs);
}

.achievement-desc {
    font-size: 0.875rem;
    color: var(--text-muted);
    margin: 0;
}

.achievement.locked {
    opacity: 0.5;
    filter: grayscale(1);
}

/* ============================================
   ANIMATIONS
   ============================================ */
@keyframes fadeIn {
    from { opacity: 0; }
    to { opacity: 1; }
}

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

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

@keyframes scaleIn {
    from {
        opacity: 0;
        transform: scale(0.9);
    }
    to {
        opacity: 1;
        transform: scale(1);
    }
}

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

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

.animate-fadeIn { animation: fadeIn 0.3s ease; }
.animate-slideUp { animation: slideUp 0.4s ease; }
.animate-slideDown { animation: slideDown 0.4s ease; }
.animate-scaleIn { animation: scaleIn 0.3s ease; }
.animate-bounce { animation: bounce 1s ease infinite; }
.animate-float { animation: float 3s ease-in-out infinite; }

/* Staggered animations */
.stagger-1 { animation-delay: 0.1s; }
.stagger-2 { animation-delay: 0.2s; }
.stagger-3 { animation-delay: 0.3s; }
.stagger-4 { animation-delay: 0.4s; }
.stagger-5 { animation-delay: 0.5s; }

/* ============================================
   UTILITIES
   ============================================ */
.text-center { text-align: center; }
.text-left { text-align: left; }
.text-right { text-align: right; }

.text-primary { color: var(--text-primary); }
.text-secondary { color: var(--text-secondary); }
.text-muted { color: var(--text-muted); }
.text-success { color: var(--success); }
.text-error { color: var(--error); }

.bg-primary { background: var(--bg-primary); }
.bg-secondary { background: var(--bg-secondary); }
.bg-surface { background: var(--surface); }

.mt-sm { margin-top: var(--space-sm); }
.mt-md { margin-top: var(--space-md); }
.mt-lg { margin-top: var(--space-lg); }
.mt-xl { margin-top: var(--space-xl); }

.mb-sm { margin-bottom: var(--space-sm); }
.mb-md { margin-bottom: var(--space-md); }
.mb-lg { margin-bottom: var(--space-lg); }
.mb-xl { margin-bottom: var(--space-xl); }

.p-sm { padding: var(--space-sm); }
.p-md { padding: var(--space-md); }
.p-lg { padding: var(--space-lg); }
.p-xl { padding: var(--space-xl); }

.rounded { border-radius: var(--radius-md); }
.rounded-lg { border-radius: var(--radius-lg); }
.rounded-xl { border-radius: var(--radius-xl); }
.rounded-full { border-radius: var(--radius-full); }

.shadow-sm { box-shadow: var(--shadow-sm); }
.shadow-md { box-shadow: var(--shadow-md); }
.shadow-lg { box-shadow: var(--shadow-lg); }

.hidden { display: none !important; }
.sr-only {
    position: absolute;
    width: 1px;
    height: 1px;
    padding: 0;
    margin: -1px;
    overflow: hidden;
    clip: rect(0, 0, 0, 0);
    white-space: nowrap;
    border: 0;
}

/* ============================================
   RESPONSIVE
   ============================================ */
@media (max-width: 768px) {
    .container {
        padding: 0 var(--space-md);
    }

    .navbar-nav {
        gap: var(--space-sm);
    }

    .nav-link span {
        display: none;
    }

    .game-header {
        flex-wrap: wrap;
        gap: var(--space-md);
    }

    .answer-grid {
        grid-template-columns: 1fr;
    }

    .question-container {
        padding: var(--space-xl);
    }
}

/* ============================================
   PRINT STYLES
   ============================================ */
@media print {
    body::before {
        display: none;
    }

    .navbar,
    .btn,
    .no-print {
        display: none !important;
    }

    .card {
        box-shadow: none;
        border: 1px solid #ddd;
    }
}

/* ============================================
   RESPONSIVE BREAKPOINTS REFERENCE
   ============================================
   --bp-xs:  375px  (iPhone SE, small phones)
   --bp-sm:  480px  (standard phones)
   --bp-md:  768px  (tablets portrait)
   --bp-lg:  1024px (tablets landscape, small laptops)
   --bp-xl:  1200px (desktops)
   ============================================ */

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

    .animate-bounce,
    .animate-float {
        animation: none !important;
    }
}

/* ============================================
   TABLET LANDSCAPE (1024px)
   ============================================ */
@media (min-width: 769px) and (max-width: 1024px) {
    .container {
        padding: 0 var(--space-lg);
    }

    /* Keep 2-column grids on tablets */
    .grid-3 {
        grid-template-columns: repeat(2, 1fr);
    }

    .grid-4 {
        grid-template-columns: repeat(2, 1fr);
    }

    /* Optimize game cards for tablet */
    .game-card {
        padding: var(--space-lg);
    }

    .game-card-icon {
        width: 56px;
        height: 56px;
        font-size: 1.75rem;
    }
}

/* ============================================
   SMALL PHONES (480px)
   ============================================ */
@media (max-width: 480px) {
    .container {
        padding: 0 var(--space-sm);
    }

    /* Navbar adjustments */
    .navbar {
        padding: var(--space-sm) 0;
    }

    .navbar-brand {
        font-size: 1.25rem;
    }

    .navbar-brand-icon {
        width: 36px;
        height: 36px;
        font-size: 1rem;
    }

    .navbar-nav {
        gap: var(--space-xs);
    }

    .nav-link {
        padding: var(--space-sm);
        font-size: 0.8rem;
    }

    /* Typography scaling */
    h1 {
        font-size: 1.75rem;
    }

    h2 {
        font-size: 1.375rem;
    }

    h3 {
        font-size: 1.125rem;
    }

    /* Buttons */
    .btn {
        padding: var(--space-sm) var(--space-lg);
        font-size: 0.9rem;
    }

    .btn-lg {
        padding: var(--space-md) var(--space-xl);
        font-size: 1.1rem;
    }

    /* Cards */
    .card {
        padding: var(--space-md);
        border-radius: var(--radius-lg);
    }

    /* Game UI */
    .question-container {
        padding: var(--space-lg);
    }

    .question-text {
        font-size: 1.75rem;
    }

    .answer-btn {
        padding: var(--space-md);
        font-size: 1.25rem;
        min-height: var(--touch-preferred);
    }

    .game-stat-value {
        font-size: 1.25rem;
    }

    /* Stats */
    .stat-value {
        font-size: 2rem;
    }

    /* Section spacing */
    .dashboard-section {
        margin-bottom: var(--space-xl);
    }

    .section-header {
        flex-direction: column;
        align-items: flex-start;
        gap: var(--space-sm);
    }

    .section-title {
        font-size: 1.25rem;
    }
}

/* ============================================
   EXTRA SMALL PHONES (375px - iPhone SE)
   ============================================ */
@media (max-width: 375px) {
    :root {
        --space-md: 12px;
        --space-lg: 16px;
        --space-xl: 24px;
    }

    .container {
        padding: 0 var(--space-xs);
    }

    /* Navbar compact mode */
    .navbar-brand {
        font-size: 1.1rem;
        gap: var(--space-xs);
    }

    .navbar-brand-icon {
        width: 32px;
        height: 32px;
    }

    .nav-link {
        padding: var(--space-xs);
        border-radius: var(--radius-md);
    }

    /* Very compact cards */
    .card {
        padding: var(--space-sm);
    }

    /* Game adjustments */
    .answer-btn {
        padding: var(--space-sm);
        font-size: 1.1rem;
        border-width: 2px;
    }

    .answer-grid {
        gap: var(--space-sm);
    }

    .question-text {
        font-size: 1.5rem;
    }

    /* Avatars */
    .avatar {
        width: 40px;
        height: 40px;
        font-size: 1.25rem;
    }

    .avatar-lg {
        width: 56px;
        height: 56px;
    }

    /* Game cards */
    .game-card {
        padding: var(--space-md);
    }

    .game-card-icon {
        width: 48px;
        height: 48px;
        font-size: 1.5rem;
    }

    .game-card-title {
        font-size: 1rem;
    }
}

/* ============================================
   LANDSCAPE ORIENTATION (phones)
   ============================================ */
@media (max-height: 500px) and (orientation: landscape) {
    /* Reduce vertical spacing */
    .navbar {
        padding: var(--space-xs) 0;
    }

    .container {
        padding: 0 var(--space-lg);
    }

    /* Compact game header */
    .game-header {
        padding: var(--space-sm) var(--space-md);
        margin-bottom: var(--space-sm);
    }

    .game-stat {
        padding: 0 var(--space-sm);
    }

    .game-stat-value {
        font-size: 1.25rem;
    }

    /* Compact question area */
    .question-container {
        padding: var(--space-md);
        margin-bottom: var(--space-md);
    }

    .question-text {
        font-size: 1.75rem;
    }

    /* Side-by-side answer grid in landscape */
    .answer-grid {
        grid-template-columns: repeat(4, 1fr);
        gap: var(--space-sm);
        max-width: 100%;
    }

    .answer-btn {
        padding: var(--space-sm) var(--space-md);
        font-size: 1.25rem;
        min-height: var(--touch-min);
    }

    /* Dashboard compact */
    .dashboard-section {
        margin-bottom: var(--space-md);
    }

    .section-header {
        margin-bottom: var(--space-sm);
    }

    /* Cards side by side */
    .child-selector {
        flex-wrap: nowrap;
        overflow-x: auto;
        -webkit-overflow-scrolling: touch;
    }

    /* Hide decorative elements */
    body::before {
        display: none;
    }
}

/* ============================================
   TOUCH DEVICE OPTIMIZATIONS
   ============================================ */
@media (hover: none) and (pointer: coarse) {
    /* Remove hover effects that don't work on touch */
    .btn:hover::before {
        opacity: 0;
    }

    .card:hover {
        transform: none;
    }

    .game-card:hover {
        transform: none;
    }

    .game-card:hover::before {
        opacity: 0;
    }

    /* Active states instead of hover */
    .btn:active {
        transform: scale(0.95);
        opacity: 0.9;
    }

    .card:active {
        transform: scale(0.98);
    }

    .game-card:active {
        transform: scale(0.98);
        border-color: var(--primary);
    }

    .answer-btn:active {
        transform: scale(0.95);
        border-color: var(--primary);
    }
}

/* ============================================
   HIGH CONTRAST MODE
   ============================================ */
@media (prefers-contrast: high) {
    :root {
        --border-light: rgba(0, 0, 0, 0.3);
        --border-medium: rgba(0, 0, 0, 0.5);
    }

    .btn {
        border: 2px solid currentColor;
    }

    .card {
        border-width: 2px;
    }

    .form-input {
        border-width: 3px;
    }
}

/* ============================================
   MOBILE MENU TOGGLE (for very small screens)
   ============================================ */
.mobile-menu-toggle {
    display: none;
    width: var(--touch-min);
    height: var(--touch-min);
    padding: var(--space-sm);
    background: transparent;
    border: none;
    cursor: pointer;
    flex-direction: column;
    justify-content: center;
    align-items: center;
    gap: 5px;
}

.mobile-menu-toggle span {
    display: block;
    width: 24px;
    height: 3px;
    background: var(--text-primary);
    border-radius: 2px;
    transition: all var(--transition-fast);
}

.mobile-menu-toggle.active span:nth-child(1) {
    transform: rotate(45deg) translate(6px, 6px);
}

.mobile-menu-toggle.active span:nth-child(2) {
    opacity: 0;
}

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

/* Show hamburger menu on very small screens */
@media (max-width: 480px) {
    .mobile-menu-toggle {
        display: flex;
    }

    .navbar-nav {
        position: absolute;
        top: 100%;
        left: 0;
        right: 0;
        flex-direction: column;
        background: var(--surface);
        padding: var(--space-md);
        box-shadow: var(--shadow-lg);
        border-radius: 0 0 var(--radius-lg) var(--radius-lg);
        transform: translateY(-10px);
        opacity: 0;
        visibility: hidden;
        transition: all var(--transition-base);
    }

    .navbar-nav.active {
        transform: translateY(0);
        opacity: 1;
        visibility: visible;
    }

    .navbar-nav .nav-link {
        width: 100%;
        justify-content: flex-start;
        padding: var(--space-md);
    }

    .navbar-nav .nav-link span {
        display: inline;
    }

    .navbar-content {
        position: relative;
    }

    .nav-language-toggle {
        padding: var(--space-sm) var(--space-md);
        width: 100%;
    }

    .nav-language-toggle .language-toggle {
        width: 100%;
        justify-content: center;
    }
}

/* Language toggle in navbar */
.nav-language-toggle {
    display: flex;
    align-items: center;
}

.nav-language-toggle .language-toggle {
    margin: 0;
}

/* ============================================
   ACCESSIBILITY IMPROVEMENTS
   ============================================ */

/* Skip to main content link */
.skip-link {
    position: absolute;
    top: -100px;
    left: 50%;
    transform: translateX(-50%);
    background: var(--primary);
    color: var(--text-inverse);
    padding: var(--space-sm) var(--space-lg);
    border-radius: var(--radius-md);
    font-weight: 600;
    text-decoration: none;
    z-index: 10000;
    transition: top var(--transition-fast);
}

.skip-link:focus {
    top: var(--space-md);
    outline: 3px solid var(--accent);
    outline-offset: 2px;
}

/* Enhanced focus indicators for all interactive elements */
a:focus-visible,
button:focus-visible,
input:focus-visible,
select:focus-visible,
textarea:focus-visible,
[role="button"]:focus-visible,
[tabindex]:focus-visible {
    outline: 3px solid var(--primary);
    outline-offset: 2px;
}

/* Button focus (override existing styles) */
.btn:focus-visible {
    outline: 3px solid var(--accent);
    outline-offset: 2px;
    box-shadow: var(--shadow-md);
}

/* Card focus for clickable cards */
.card-hover:focus-visible {
    outline: 3px solid var(--primary);
    outline-offset: 2px;
}

/* Navigation link focus */
.nav-link:focus-visible {
    outline: 3px solid var(--accent);
    outline-offset: 2px;
    border-radius: var(--radius-md);
}

/* Game option focus (for game buttons) */
.game-option:focus-visible,
.answer-btn:focus-visible {
    outline: 3px solid var(--accent);
    outline-offset: 2px;
    transform: scale(1.02);
}

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

/* Visible on focus for screen reader content */
.sr-only-focusable:focus,
.sr-only-focusable:active {
    position: static;
    width: auto;
    height: auto;
    padding: inherit;
    margin: inherit;
    overflow: visible;
    clip: auto;
    white-space: normal;
}

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

    .animate-slideDown,
    .animate-bounce,
    .animate-pulse,
    .animate-wiggle {
        animation: none !important;
    }
}

/* High contrast mode improvements */
@media (prefers-contrast: more) {
    :root {
        --border-light: rgba(45, 52, 54, 0.3);
        --border-medium: rgba(45, 52, 54, 0.5);
        --text-muted: #555555;
    }

    .btn {
        border: 2px solid currentColor;
    }

    .card {
        border: 2px solid var(--border-medium);
    }
}