/**
 * Baú de Histórias - Styles
 * Desenvolvido por B20 Conteúdo Digital
 * https://www.b20.com.br
 */

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

/* CSS Custom Properties - Sunrise & Midnight Storybook (Antigravity & Glassmorphism) */
:root, [data-theme="light"] {
    /* Colors */
    --primary-color: #8b5cf6;
    --primary-light: #a78bfa;
    --primary-dark: #6d28d9;
    --secondary-color: #f59e0b;
    --success-color: #10b981;
    --warning-color: #f59e0b;
    --error-color: #ef4444;
    
    /* Surface Colors (Sunrise Glass) */
    --body-bg: radial-gradient(circle at top right, #f3e8ff 0%, #f1f5f9 60%);
    --surface-color: rgba(255, 255, 255, 0.6);
    --surface-secondary: rgba(255, 255, 255, 0.85);
    --border-color: rgba(139, 92, 246, 0.2);
    
    /* Text Colors */
    --text-color: #1e293b;
    --text-secondary: #475569;
    --text-tertiary: #64748b;
    --text-inverse: #ffffff;
    
    /* Spacing */
    --spacing-xs: 4px;
    --spacing-sm: 8px;
    --spacing-md: 16px;
    --spacing-lg: 24px;
    --spacing-xl: 32px;
    --spacing-2xl: 48px;
    
    /* Typography */
    --font-family: 'Inter', -apple-system, BlinkMacSystemFont, 'Segoe UI', Roboto, Oxygen, Ubuntu, Cantarell, sans-serif;
    --font-size-xs: 12px;
    --font-size-sm: 14px;
    --font-size-base: 16px;
    --font-size-lg: 18px;
    --font-size-xl: 20px;
    --font-size-2xl: 24px;
    --font-size-3xl: 32px;
    
    /* Shadows - Light Glass */
    --shadow-sm: 0 4px 12px rgba(0, 0, 0, 0.05);
    --shadow-md: 0 10px 25px rgba(0, 0, 0, 0.05), inset 0 1px 1px rgba(255,255,255,0.8);
    --shadow-lg: 0 20px 40px rgba(0, 0, 0, 0.08), inset 0 1px 1px rgba(255,255,255,0.8);
    --shadow-xl: 0 30px 60px rgba(139, 92, 246, 0.15), inset 0 1px 2px rgba(255,255,255,0.9);
    
    /* Border Radius */
    --radius-sm: 8px;
    --radius-md: 12px;
    --radius-lg: 20px;
    --radius-xl: 28px;
    --radius-full: 9999px;
    
    /* Transitions */
    --transition-fast: 0.15s cubic-bezier(0.4, 0, 0.2, 1);
    --transition-base: 0.3s cubic-bezier(0.4, 0, 0.2, 1);
    --transition-slow: 0.5s cubic-bezier(0.4, 0, 0.2, 1);
    
    /* Z-index */
    --z-dropdown: 1000;
    --z-sticky: 1020;
    --z-fixed: 1030;
    --z-modal: 1040;
    --z-popover: 1050;
    --z-tooltip: 1060;
}

[data-theme="dark"] {
    /* Surface Colors (Midnight Glass) */
    --body-bg: radial-gradient(circle at top right, #1e1b4b 0%, #090e17 60%);
    --surface-color: rgba(30, 41, 59, 0.5);
    --surface-secondary: rgba(30, 41, 59, 0.85);
    --border-color: rgba(255, 255, 255, 0.1);
    
    /* Text Colors */
    --text-color: #f8fafc;
    --text-secondary: #94a3b8;
    --text-tertiary: #64748b;
    
    /* Shadows - Dark Glass */
    --shadow-sm: 0 4px 12px rgba(0, 0, 0, 0.2);
    --shadow-md: 0 10px 25px rgba(0, 0, 0, 0.3), inset 0 1px 1px rgba(255,255,255,0.1);
    --shadow-lg: 0 20px 40px rgba(0, 0, 0, 0.4), inset 0 1px 1px rgba(255,255,255,0.1);
    --shadow-xl: 0 30px 60px rgba(139, 92, 246, 0.15), inset 0 1px 2px rgba(255,255,255,0.15);
}

/* Global Aesthetics */
body {
    background: var(--body-bg);
    background-attachment: fixed;
}


/* Base Styles */
html {
    font-size: clamp(14px, 2.5vw, 18px);
    scroll-behavior: smooth;
    overflow-x: hidden;
    width: 100%;
    max-width: 100vw;
}

body {
    font-family: var(--font-family);
    font-size: var(--font-size-base);
    line-height: 1.6;
    color: var(--text-color);
    padding-top: 70px;
    padding-bottom: env(safe-area-inset-bottom, 0);
    transition: background var(--transition-base), color var(--transition-base);
    overflow-x: hidden;
    width: 100%;
    position: relative;
}

/* Mobile: Bottom nav padding */
@media (max-width: 767px) {
    body {
        padding-bottom: calc(100px + env(safe-area-inset-bottom, 16px));
    }
}

/* Typography */
h1, h2, h3, h4, h5, h6 {
    font-weight: 600;
    line-height: 1.3;
    margin-bottom: var(--spacing-md);
}

h1 { font-size: var(--font-size-3xl); }
h2 { font-size: var(--font-size-2xl); }
h3 { font-size: var(--font-size-xl); }
h4 { font-size: var(--font-size-lg); }

p {
    margin-bottom: var(--spacing-md);
}

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

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

/* Header */
.app-header {
    position: fixed;
    top: 0;
    left: 0;
    right: 0;
    height: 70px;
    background: var(--surface-secondary);
    display: flex;
    align-items: center;
    justify-content: space-between;
    padding: 0 var(--spacing-md);
    box-shadow: 0 4px 30px rgba(0, 0, 0, 0.3);
    z-index: var(--z-fixed);
    backdrop-filter: blur(12px);
    -webkit-backdrop-filter: blur(12px);
    border-bottom: 1px solid rgba(255, 255, 255, 0.05);
    padding-top: env(safe-area-inset-top, 0);
}

.header-logo h1 {
    font-size: var(--font-size-lg);
    margin: 0;
    color: var(--primary-color);
}

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

.user-points {
    display: flex;
    align-items: center;
    gap: var(--spacing-xs);
    background: var(--primary-color);
    color: var(--text-inverse);
    padding: var(--spacing-xs) var(--spacing-sm);
    border-radius: var(--radius-full);
    font-size: var(--font-size-sm);
    font-weight: 600;
}

/* Desktop Navigation */
.desktop-nav {
    display: none;
    gap: var(--spacing-xs);
    background: var(--surface-color);
    padding: 6px;
    border-radius: var(--radius-full);
    border: 1px solid var(--border-color);
    box-shadow: var(--shadow-md);
    backdrop-filter: blur(16px);
    -webkit-backdrop-filter: blur(16px);
}

.desktop-nav .nav-link {
    display: flex;
    align-items: center;
    gap: 8px;
    padding: 8px 18px;
    border-radius: var(--radius-full);
    color: var(--text-secondary);
    text-decoration: none;
    transition: all var(--transition-base);
    font-size: var(--font-size-sm);
    font-weight: 600;
}

.desktop-nav .nav-link:hover {
    color: var(--text-color);
    background: var(--surface-secondary);
}

.desktop-nav .nav-link.active {
    background: var(--primary-color);
    color: var(--text-inverse);
    box-shadow: 0 4px 15px rgba(139, 92, 246, 0.4);
}

@media (min-width: 768px) {
    .desktop-nav {
        display: flex;
    }
    .bottom-nav {
        display: none !important;
    }
}

/* Bottom Navigation */
.bottom-nav {
    position: fixed;
    bottom: max(var(--spacing-md), env(safe-area-inset-bottom, 16px));
    left: var(--spacing-md);
    right: var(--spacing-md);
    height: 70px;
    background: var(--surface-color);
    backdrop-filter: blur(20px);
    -webkit-backdrop-filter: blur(20px);
    display: flex;
    justify-content: space-around;
    align-items: center;
    box-shadow: var(--shadow-lg);
    z-index: var(--z-fixed);
    border-radius: var(--radius-full);
    border: 1px solid var(--border-color);
}

.footer-links {
    display: flex;
    flex-wrap: wrap;
    justify-content: center;
    gap: 12px;
    margin: var(--spacing-md) 0;
}

.footer-links a {
    color: var(--text-color);
    text-decoration: none;
    font-size: 0.85rem;
    font-weight: 600;
    text-transform: uppercase;
    letter-spacing: 0.5px;
    background: var(--surface-color);
    padding: 8px 16px;
    border-radius: 20px;
    border: 1px solid var(--border-color);
    transition: all 0.3s ease;
    box-shadow: var(--shadow-sm);
}

.footer-links a:hover {
    color: var(--text-inverse);
    background: var(--primary-color);
    transform: translateY(-2px);
    box-shadow: var(--shadow-md);
}

.nav-item {
    display: flex;
    flex-direction: column;
    align-items: center;
    justify-content: center;
    gap: var(--spacing-xs);
    padding: var(--spacing-sm) var(--spacing-md);
    color: var(--text-secondary);
    text-decoration: none;
    font-size: var(--font-size-xs);
    transition: all var(--transition-base);
    min-width: 64px;
    min-height: 44px;
}

.nav-item i {
    font-size: 20px;
    transition: transform var(--transition-base);
}

.nav-item.active {
    color: var(--primary-color);
}

.nav-item.active i {
    transform: scale(1.15);
}

/* FAB Central */
.nav-item-fab {
    width: 60px;
    height: 60px;
    background: var(--primary-color);
    border-radius: var(--radius-full);
    margin-top: -30px;
    color: var(--text-inverse) !important;
    box-shadow: 0 8px 24px rgba(139, 92, 246, 0.5);
    z-index: 2;
}

.nav-item-fab i {
    font-size: 24px;
}

.nav-item-fab span {
    display: none;
}

/* Buttons */
.btn-primary,
.btn-secondary,
.btn-icon {
    display: inline-flex;
    align-items: center;
    justify-content: center;
    gap: var(--spacing-xs);
    padding: var(--spacing-sm) var(--spacing-md);
    border: none;
    border-radius: var(--radius-md);
    font-size: var(--font-size-sm);
    font-weight: 500;
    cursor: pointer;
    transition: all var(--transition-base);
    text-decoration: none;
    min-height: 44px;
}

.btn-primary {
    background: var(--primary-color);
    color: var(--text-inverse);
}

.btn-primary:hover {
    background: var(--primary-dark);
    transform: translateY(-1px);
    box-shadow: var(--shadow-md);
}

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

.btn-secondary:hover {
    background: var(--surface-tertiary);
    transform: translateY(-1px);
}

.btn-icon {
    width: 44px;
    height: 44px;
    padding: 0;
    background: transparent;
    color: var(--text-secondary);
}

.btn-icon:hover {
    background: var(--surface-secondary);
    color: var(--text-color);
}

.btn-back {
    display: flex;
    align-items: center;
    gap: var(--spacing-xs);
    background: none;
    border: none;
    color: var(--text-secondary);
    font-size: var(--font-size-sm);
    cursor: pointer;
    padding: var(--spacing-xs);
    border-radius: var(--radius-sm);
    transition: all var(--transition-base);
}

.btn-back:hover {
    background: var(--surface-secondary);
    color: var(--text-color);
}

/* Sections */
.section {
    display: none;
    padding: var(--spacing-lg) var(--spacing-md);
    min-height: calc(100vh - 140px);
}

.section.active {
    display: block;
}

.section-header {
    margin-bottom: var(--spacing-xl);
}

.section-header h2 {
    margin-bottom: var(--spacing-sm);
}

/* Hero Section */
.hero-section {
    background: linear-gradient(135deg, var(--primary-color), var(--primary-light));
    border-radius: var(--radius-xl);
    padding: var(--spacing-2xl);
    text-align: center;
    color: var(--text-inverse);
    margin-bottom: var(--spacing-xl);
}

.hero-content h2 {
    font-size: var(--font-size-2xl);
    margin-bottom: var(--spacing-md);
}

.hero-content p {
    font-size: var(--font-size-lg);
    opacity: 0.9;
    margin-bottom: var(--spacing-lg);
}

/* Featured Stories */
.featured-stories {
    margin-bottom: var(--spacing-xl);
}

.stories-carousel {
    display: grid;
    grid-template-columns: repeat(auto-fit, minmax(280px, 1fr));
    gap: var(--spacing-md);
    margin-top: var(--spacing-md);
}

/* Story Cards - Antigravity Glassmorphism */
.story-card {
    background: var(--surface-color);
    backdrop-filter: blur(12px);
    -webkit-backdrop-filter: blur(12px);
    border: 1px solid var(--border-color);
    border-radius: var(--radius-xl);
    padding: 0;
    overflow: hidden;
    cursor: pointer;
    transition: all var(--transition-slow);
    box-shadow: var(--shadow-md);
    display: flex;
    flex-direction: column;
}

.story-card:hover {
    transform: translateY(-8px) scale(1.02);
    box-shadow: var(--shadow-xl);
    border-color: rgba(139, 92, 246, 0.4);
}

.story-card-header {
    height: 180px;
    display: flex;
    justify-content: flex-end;
    align-items: flex-start;
    position: relative;
    border-bottom: 1px solid var(--border-color);
    background-color: var(--surface-secondary);
    background-size: cover;
    background-position: center;
    background-repeat: no-repeat;
    transition: transform var(--transition-slow);
}

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

.status-badge.read {
    position: absolute;
    top: 12px;
    right: 12px;
    background: rgba(16, 185, 129, 0.9);
    color: white;
    padding: 6px 14px;
    border-radius: var(--radius-full);
    font-size: var(--font-size-xs);
    font-weight: 700;
    box-shadow: 0 4px 12px rgba(16, 185, 129, 0.3);
    backdrop-filter: blur(4px);
    z-index: 2;
}

.story-card-content {
    padding: var(--spacing-lg);
    display: flex;
    flex-direction: column;
    flex: 1;
    background: var(--surface-color);
}

.story-card-content .story-category {
    display: inline-block;
    width: fit-content;
    margin-bottom: var(--spacing-sm);
    font-size: var(--font-size-xs);
    font-weight: 600;
    text-transform: uppercase;
    letter-spacing: 0.5px;
    color: var(--primary-light);
    background: rgba(139, 92, 246, 0.1);
    padding: 4px 10px;
    border-radius: var(--radius-md);
}

.story-title {
    font-size: var(--font-size-lg);
    margin-bottom: var(--spacing-xs);
    font-weight: 700;
    color: var(--text-color);
}

.story-desc {
    color: var(--text-secondary);
    font-size: var(--font-size-sm);
    margin-bottom: var(--spacing-md);
    flex-grow: 1; 
    display: -webkit-box;
    -webkit-line-clamp: 2;
    line-clamp: 2;
    -webkit-box-orient: vertical;
    overflow: hidden;
}

.story-progress {
    display: flex;
    align-items: center;
    justify-content: space-between;
    font-size: var(--font-size-xs);
    color: var(--text-secondary);
}

.progress-bar {
    flex: 1;
    height: 4px;
    background: var(--surface-tertiary);
    border-radius: var(--radius-full);
    margin: 0 var(--spacing-sm);
    overflow: hidden;
}

.progress-fill {
    height: 100%;
    background: var(--success-color);
    border-radius: var(--radius-full);
    transition: width var(--transition-slow);
}

/* Stats Overview */
.stats-overview {
    display: grid;
    grid-template-columns: repeat(auto-fit, minmax(200px, 1fr));
    gap: var(--spacing-md);
    margin-bottom: var(--spacing-xl);
}

.stat-card {
    background: var(--surface-color);
    backdrop-filter: blur(10px);
    border: 1px solid var(--border-color);
    border-radius: var(--radius-xl);
    padding: var(--spacing-lg);
    display: flex;
    align-items: center;
    gap: var(--spacing-md);
    box-shadow: var(--shadow-md);
    transition: transform var(--transition-base);
}

.stat-card:hover {
    transform: translateY(-4px);
    border-color: rgba(139, 92, 246, 0.3);
}

.stat-card i {
    font-size: 32px;
    color: var(--primary-light);
    filter: drop-shadow(0 0 10px rgba(139, 92, 246, 0.5));
}

.stat-number {
    font-size: var(--font-size-2xl);
    font-weight: 700;
    color: var(--text-color);
    display: block;
    text-shadow: 0 0 15px rgba(255,255,255,0.2);
}

.stat-label {
    font-size: var(--font-size-sm);
    color: var(--text-secondary);
}

/* Search and Filters */
.search-filters {
    display: flex;
    gap: var(--spacing-md);
    margin-bottom: var(--spacing-lg);
}

.search-filters input,
.search-filters select {
    flex: 1;
    padding: var(--spacing-sm) var(--spacing-md);
    border: 1px solid var(--border-color);
    border-radius: var(--radius-md);
    font-size: var(--font-size-sm);
    background: var(--surface-color);
    color: var(--text-color);
    transition: border-color var(--transition-base);
}

.search-filters input:focus,
.search-filters select:focus {
    outline: none;
    border-color: var(--primary-color);
    box-shadow: 0 0 0 3px rgba(99, 102, 241, 0.1);
}

/* Stories Grid */
.stories-grid {
    display: grid;
    grid-template-columns: repeat(auto-fill, minmax(300px, 1fr));
    gap: var(--spacing-lg);
}

/* Story Reader */
.reader-header {
    display: flex;
    align-items: center;
    justify-content: space-between;
    margin-bottom: var(--spacing-lg);
    padding-bottom: var(--spacing-md);
    border-bottom: 1px solid var(--border-color);
}

.reader-controls {
    display: flex;
    gap: var(--spacing-sm);
}

.story-content {
    max-width: 800px;
    margin: 0 auto;
}

.story-image {
    text-align: center;
    margin-bottom: var(--spacing-lg);
}

.story-illustration {
    width: 220px;
    height: 220px;
    background: linear-gradient(145deg, var(--surface-secondary), var(--surface-color));
    border-radius: 50%;
    display: flex;
    align-items: center;
    justify-content: center;
    font-size: 80px;
    margin: 0 auto;
    border: 2px solid var(--border-color);
    box-shadow: 0 20px 50px rgba(139, 92, 246, 0.2), inset 0 2px 10px rgba(255,255,255,0.1);
    animation: float 6s ease-in-out infinite;
}

@keyframes float {
    0% { transform: translateY(0px); }
    50% { transform: translateY(-15px); }
    100% { transform: translateY(0px); }
}

.story-text {
    font-size: var(--font-size-lg);
    line-height: 1.8;
    margin-bottom: var(--spacing-xl);
    text-align: justify;
}

.story-navigation {
    display: flex;
    align-items: center;
    justify-content: space-between;
    margin-bottom: var(--spacing-xl);
}

.page-indicator {
    font-size: var(--font-size-sm);
    color: var(--text-secondary);
}

.story-actions {
    display: flex;
    gap: var(--spacing-md);
    justify-content: center;
}

/* Quiz */
.quiz-header {
    display: flex;
    align-items: center;
    justify-content: space-between;
    margin-bottom: var(--spacing-lg);
    padding-bottom: var(--spacing-md);
    border-bottom: 1px solid var(--border-color);
}

.quiz-progress {
    display: flex;
    align-items: center;
    gap: var(--spacing-sm);
}

.quiz-progress .progress-bar {
    width: 200px;
    margin: 0;
}

.quiz-content {
    max-width: 600px;
    margin: 0 auto;
}

.quiz-question {
    background: var(--surface-color);
    border: 1px solid var(--border-color);
    border-radius: var(--radius-lg);
    padding: var(--spacing-lg);
    margin-bottom: var(--spacing-lg);
    box-shadow: var(--shadow-sm);
}

.question-text {
    font-size: var(--font-size-lg);
    font-weight: 600;
    margin-bottom: var(--spacing-md);
}

.quiz-options {
    display: grid;
    gap: var(--spacing-sm);
}

.quiz-option {
    padding: var(--spacing-md);
    border: 2px solid var(--border-color);
    border-radius: var(--radius-md);
    background: var(--surface-color);
    cursor: pointer;
    transition: all var(--transition-base);
    text-align: left;
    font-size: var(--font-size-base);
}

.quiz-option:hover {
    border-color: var(--primary-color);
    background: var(--surface-secondary);
}

.quiz-option.selected {
    border-color: var(--primary-color);
    background: rgba(99, 102, 241, 0.1);
}

.quiz-option.correct {
    border-color: var(--success-color);
    background: rgba(16, 185, 129, 0.1);
}

.quiz-option.incorrect {
    border-color: var(--error-color);
    background: rgba(239, 68, 68, 0.1);
}

.quiz-actions {
    display: flex;
    justify-content: center;
    margin-top: var(--spacing-lg);
}

/* Achievements */
.achievements-grid {
    display: grid;
    grid-template-columns: repeat(auto-fill, minmax(250px, 1fr));
    gap: var(--spacing-lg);
    margin-bottom: var(--spacing-xl);
}

.achievement-card {
    background: var(--surface-color);
    border: 1px solid var(--border-color);
    border-radius: var(--radius-lg);
    padding: var(--spacing-lg);
    text-align: center;
    box-shadow: var(--shadow-sm);
    transition: all var(--transition-base);
}

.achievement-card.unlocked {
    border-color: var(--success-color);
    background: rgba(16, 185, 129, 0.05);
}

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

.achievement-icon {
    font-size: 48px;
    margin-bottom: var(--spacing-md);
}

.achievement-card.unlocked .achievement-icon {
    filter: none;
}

.achievement-card:not(.unlocked) .achievement-icon {
    filter: grayscale(100%) opacity(0.5);
}

.achievement-title {
    font-size: var(--font-size-lg);
    font-weight: 600;
    margin-bottom: var(--spacing-sm);
}

.achievement-description {
    font-size: var(--font-size-sm);
    color: var(--text-secondary);
}

/* Progress Section */
.progress-section {
    background: var(--surface-secondary);
    border-radius: var(--radius-lg);
    padding: var(--spacing-lg);
}

.progress-stats {
    display: grid;
    gap: var(--spacing-lg);
}

.progress-item {
    display: grid;
    grid-template-columns: 1fr auto;
    gap: var(--spacing-md);
    align-items: center;
}

.progress-label {
    font-weight: 500;
}

.progress-text {
    font-size: var(--font-size-sm);
    color: var(--text-secondary);
    white-space: nowrap;
}

/* Profile */
.profile-header {
    display: flex;
    align-items: center;
    gap: var(--spacing-lg);
    margin-bottom: var(--spacing-xl);
    padding: var(--spacing-lg);
    background: var(--surface-secondary);
    border-radius: var(--radius-lg);
}

.profile-avatar i {
    font-size: 64px;
    color: var(--primary-color);
}

.profile-info h2 {
    margin-bottom: var(--spacing-xs);
}

.user-level {
    font-size: var(--font-size-sm);
    color: var(--text-secondary);
    margin-bottom: var(--spacing-sm);
}

.user-stats {
    display: flex;
    gap: var(--spacing-md);
    font-size: var(--font-size-sm);
}

.profile-sections {
    display: grid;
    gap: var(--spacing-xl);
}

.profile-section {
    background: var(--surface-color);
    border: 1px solid var(--border-color);
    border-radius: var(--radius-lg);
    padding: var(--spacing-lg);
}

.settings-list {
    display: grid;
    gap: var(--spacing-md);
}

.setting-item {
    display: flex;
    align-items: center;
    justify-content: space-between;
    padding: var(--spacing-sm) 0;
}

.setting-item label {
    display: flex;
    align-items: center;
    gap: var(--spacing-sm);
    cursor: pointer;
}

.setting-item input[type="checkbox"] {
    width: 20px;
    height: 20px;
}

.setting-item select {
    padding: var(--spacing-xs) var(--spacing-sm);
    border: 1px solid var(--border-color);
    border-radius: var(--radius-sm);
    background: var(--surface-color);
    color: var(--text-color);
}

.stats-detailed {
    display: grid;
    gap: var(--spacing-md);
}

.stat-item {
    display: flex;
    align-items: center;
    gap: var(--spacing-md);
    padding: var(--spacing-sm) 0;
}

.stat-icon {
    font-size: 24px;
}

.stat-name {
    flex: 1;
}

.stat-value {
    font-weight: 600;
    color: var(--primary-color);
}

/* FAQ */
.faq-section {
    margin: var(--spacing-2xl) var(--spacing-md);
    max-width: 800px;
    margin-left: auto;
    margin-right: auto;
}

.faq-container {
    display: grid;
    gap: var(--spacing-sm);
}

.faq-item {
    border: 1px solid var(--border-color);
    border-radius: var(--radius-md);
    overflow: hidden;
}

.faq-question {
    width: 100%;
    padding: var(--spacing-md);
    background: var(--surface-color);
    border: none;
    text-align: left;
    font-size: var(--font-size-base);
    font-weight: 500;
    cursor: pointer;
    display: flex;
    align-items: center;
    justify-content: space-between;
    transition: background-color var(--transition-base);
}

.faq-question:hover {
    background: var(--surface-secondary);
}

.faq-question[aria-expanded="true"] .faq-icon {
    transform: rotate(45deg);
}

.faq-icon {
    font-size: var(--font-size-lg);
    font-weight: 300;
    transition: transform var(--transition-base);
}

.faq-answer {
    padding: 0 var(--spacing-md) var(--spacing-md);
    background: var(--surface-secondary);
    animation: fadeIn var(--transition-base);
}

.faq-answer[hidden] {
    display: none;
}

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

/* Footer */
.app-footer {
    background: var(--surface-secondary);
    padding: var(--spacing-xl) var(--spacing-md);
    text-align: center;
    border-top: 1px solid var(--border-color);
    margin-top: var(--spacing-2xl);
}

.app-footer p {
    margin-bottom: var(--spacing-sm);
    font-size: var(--font-size-sm);
    color: var(--text-secondary);
}

.b20-link {
    color: var(--primary-color);
    font-weight: 600;
    text-decoration: none;
    transition: all var(--transition-base);
}

.b20-link:hover {
    text-decoration: underline;
    transform: scale(1.05);
}

.copyright {
    font-size: var(--font-size-xs);
    opacity: 0.8;
}

/* Loading Overlay */
.loading-overlay {
    position: fixed;
    top: 0;
    left: 0;
    right: 0;
    bottom: 0;
    background: rgba(0, 0, 0, 0.8);
    display: flex;
    align-items: center;
    justify-content: center;
    z-index: var(--z-modal);
    opacity: 0;
    visibility: hidden;
    transition: all var(--transition-base);
}

.loading-overlay.active {
    opacity: 1;
    visibility: visible;
}

.loading-spinner {
    text-align: center;
    color: var(--text-inverse);
}

.loading-spinner i {
    font-size: 48px;
    margin-bottom: var(--spacing-md);
}

/* Responsive Design */
@media (max-width: 767px) {
    .search-filters {
        flex-direction: column;
    }
    
    .story-actions {
        flex-direction: column;
    }
    
    .quiz-actions {
        flex-direction: column;
        align-items: stretch;
    }
    
    .profile-header {
        flex-direction: column;
        text-align: center;
    }
    
    .user-stats {
        justify-content: center;
    }
    
    .story-navigation {
        flex-direction: column;
        gap: var(--spacing-md);
    }
    
    .reader-header {
        flex-direction: column;
        align-items: flex-start;
        gap: var(--spacing-md);
    }
    
    .quiz-header {
        flex-direction: column;
        align-items: flex-start;
        gap: var(--spacing-md);
    }
}

@media (min-width: 768px) {
    .section {
        padding: var(--spacing-xl) var(--spacing-lg);
    }
    
    .hero-section {
        padding: var(--spacing-2xl) var(--spacing-xl);
    }
    
    .stories-carousel {
        grid-template-columns: repeat(auto-fit, minmax(320px, 1fr));
    }
    
    .stories-grid {
        grid-template-columns: repeat(auto-fill, minmax(350px, 1fr));
    }
}

@media (min-width: 1024px) {
    .section {
        padding: var(--spacing-xl) var(--spacing-2xl);
    }
    
    .stories-carousel {
        grid-template-columns: repeat(3, 1fr);
    }
    
    .achievements-grid {
        grid-template-columns: repeat(auto-fill, minmax(280px, 1fr));
    }
}

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

/* Focus styles */
*:focus {
    outline: 2px solid var(--primary-color);
    outline-offset: 2px;
}

button:focus,
input:focus,
select:focus,
.nav-item:focus,
.nav-link:focus {
    outline: 2px solid var(--primary-color);
    outline-offset: 2px;
}

/* High contrast mode support */
@media (prefers-contrast: high) {
    :root {
        --border-color: #000000;
        --text-secondary: #000000;
    }
    
    [data-theme="dark"] {
        --border-color: #ffffff;
        --text-secondary: #ffffff;
    }
}

/* Reduced motion support */
@media (prefers-reduced-motion: reduce) {
    * {
        animation-duration: 0.01ms !important;
        animation-iteration-count: 1 !important;
        transition-duration: 0.01ms !important;
    }
    
    html {
        scroll-behavior: auto;
    }
}

/* Print styles */
@media print {
    .app-header,
    .bottom-nav,
    .btn-primary,
    .btn-secondary,
    .btn-icon {
        display: none !important;
    }
    
    .section {
        display: block !important;
        padding: 0;
    }
    
    body {
        padding: 0;
    }
}

/* Professional Hero Section */
.professional-hero {
    display: flex;
    align-items: center;
    justify-content: space-between;
    gap: var(--spacing-xl);
    padding: var(--spacing-xl) 0 var(--spacing-2xl);
}

.hero-text-content {
    flex: 1;
    max-width: 650px;
}

.badge-new {
    display: inline-block;
    padding: 6px 16px;
    background: rgba(139, 92, 246, 0.15);
    border: 1px solid rgba(139, 92, 246, 0.3);
    color: var(--primary-color);
    border-radius: var(--radius-full);
    font-size: var(--font-size-sm);
    font-weight: 700;
    margin-bottom: var(--spacing-lg);
    letter-spacing: 0.5px;
    text-transform: uppercase;
    box-shadow: 0 0 20px rgba(139, 92, 246, 0.2);
}

.hero-text-content h1 {
    font-size: clamp(38px, 6vw, 64px);
    font-weight: 800;
    line-height: 1.1;
    margin-bottom: var(--spacing-md);
    letter-spacing: -1.5px;
    color: var(--text-color);
}

.text-gradient {
    background: linear-gradient(135deg, var(--primary-light), var(--secondary-color));
    -webkit-background-clip: text;
    background-clip: text;
    -webkit-text-fill-color: transparent;
    display: inline-block;
}

.hero-text-content p {
    font-size: var(--font-size-lg);
    color: var(--text-secondary);
    margin-bottom: var(--spacing-xl);
    line-height: 1.7;
    max-width: 90%;
}

.hero-actions {
    display: flex;
    gap: var(--spacing-md);
}

.hero-visual {
    flex: 1;
    display: flex;
    justify-content: center;
    position: relative;
}

.hero-image-wrapper {
    position: relative;
    width: 100%;
    max-width: 480px;
}

.hero-image-wrapper::before {
    content: '';
    position: absolute;
    top: 50%;
    left: 50%;
    transform: translate(-50%, -50%);
    width: 130%;
    height: 130%;
    background: radial-gradient(circle, rgba(139, 92, 246, 0.2) 0%, transparent 60%);
    z-index: -1;
    border-radius: 50%;
    filter: blur(40px);
}

.hero-image {
    width: 100%;
    height: auto;
    border-radius: 36px;
    box-shadow: var(--shadow-xl);
    border: 1px solid var(--border-color);
    backdrop-filter: blur(10px);
    background: rgba(30, 41, 59, 0.3);
}

.float-animation {
    animation: float-hero 6s ease-in-out infinite;
}

@keyframes float-hero {
    0% { transform: translateY(0px) rotate(0deg); }
    50% { transform: translateY(-15px) rotate(1.5deg); }
    100% { transform: translateY(0px) rotate(0deg); }
}

/* --- STORY READER CSS --- */
.story-illustration {
    width: 280px;
    height: 200px;
    background: var(--surface-secondary);
    border-radius: 20px;
    margin: 0 auto;
    display: flex;
    align-items: center;
    justify-content: center;
    box-shadow: 0 15px 35px rgba(0,0,0,0.1);
    border: 4px solid var(--border-color);
    margin-bottom: var(--spacing-xl);
}

.story-navigation {
    display: flex;
    align-items: center;
    justify-content: space-between;
    gap: var(--spacing-sm);
    margin-top: var(--spacing-xl);
    padding: var(--spacing-md) 0;
}

.story-actions {
    display: flex;
    align-items: center;
    justify-content: center;
    gap: var(--spacing-md);
    margin-top: var(--spacing-lg);
    border-top: 1px solid var(--border-color);
    padding-top: var(--spacing-lg);
}

@media (max-width: 991px) {
    .professional-hero {
        flex-direction: column-reverse;
        text-align: center;
        padding: var(--spacing-md) 0 var(--spacing-lg);
    }
    .hero-text-content p {
        max-width: 100%;
        margin-left: auto;
        margin-right: auto;
    }
    .hero-actions {
        justify-content: center;
    }
    .hero-image-wrapper {
        max-width: 380px;
    }
}

@media (max-width: 480px) {
    .hero-actions {
        flex-direction: column;
    }
    .hero-actions .btn-primary, .hero-actions .btn-secondary {
        width: 100%;
        justify-content: center;
    }
    .story-navigation button {
        padding: 10px 14px;
        font-size: var(--font-size-sm);
    }
    .story-actions {
        flex-direction: column;
    }
    .story-actions button {
        width: 100%;
        justify-content: center;
    }
}

/* --- EMPHASIZED PLAY BUTTON --- */
#toggle-audio {
    background: linear-gradient(135deg, var(--success-color), #059669);
    color: white;
    width: 48px;
    height: 48px;
    border-radius: 50%;
    display: flex;
    align-items: center;
    justify-content: center;
    box-shadow: 0 4px 15px rgba(16, 185, 129, 0.4);
    animation: pulse-glow 2s infinite;
    transition: transform 0.3s ease, box-shadow 0.3s ease;
    border: none;
    cursor: pointer;
}

#toggle-audio:hover {
    transform: scale(1.1);
    box-shadow: 0 6px 20px rgba(16, 185, 129, 0.6);
    animation: none;
}

@keyframes pulse-glow {
    0% { box-shadow: 0 0 0 0 rgba(16, 185, 129, 0.4); }
    70% { box-shadow: 0 0 0 10px rgba(16, 185, 129, 0); }
    100% { box-shadow: 0 0 0 0 rgba(16, 185, 129, 0); }
}

#toggle-audio i {
    font-size: 1.2rem;
    margin-left: 3px; /* visual center for play icon */
}
#toggle-audio i.fa-pause {
    margin-left: 0; /* visual center for pause icon */
}