/* Modern CSS UI System for Prayas Plus UP GK Special */
:root {
    /* Color Tokens (Dark Theme Defaults matching Flutter app_theme) */
    --bg-main: #0D1117;
    --bg-nav: rgba(22, 27, 34, 0.8);
    --border-color: rgba(48, 54, 61, 0.5);
    --card-bg: rgba(22, 27, 34, 0.6);
    --card-bg-hover: rgba(22, 27, 34, 0.85);
    --text-primary: #F0F6FC;
    --text-secondary: #8B949E;
    --text-muted: #484F58;
    
    --primary: #FF6B00;
    --primary-hover: #E05A00;
    --primary-rgb: 255, 107, 0;
    
    --secondary: #2E7D32;
    --secondary-hover: #1B5E20;
    
    --success: #10B981;
    --success-bg: rgba(16, 185, 129, 0.15);
    --danger: #EF4444;
    --danger-bg: rgba(239, 68, 68, 0.15);
    --warning: #F59E0B;
    
    --radius-sm: 8px;
    --radius-md: 16px;
    --radius-lg: 24px;
    
    --transition: all 0.3s cubic-bezier(0.4, 0, 0.2, 1);
    --font-heading: 'Outfit', 'Inter', sans-serif;
    --font-body: 'Inter', 'Noto Sans Devanagari', sans-serif;
}

/* Light Theme Overrides (matching Flutter app_theme) */
body.light-theme {
    --bg-main: #F8F9FA;
    --bg-nav: rgba(255, 255, 255, 0.85);
    --border-color: rgba(224, 224, 224, 0.8);
    --card-bg: rgba(255, 255, 255, 0.7);
    --card-bg-hover: rgba(255, 255, 255, 0.9);
    --text-primary: #111827;
    --text-secondary: #6B7280;
    --text-muted: #9CA3AF;
    
    --primary: #FF6B00;
    --primary-hover: #E05A00;
    
    --secondary: #2E7D32;
    --secondary-hover: #1B5E20;
}

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

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

body {
    font-family: var(--font-body);
    background-color: var(--bg-main);
    color: var(--text-primary);
    line-height: 1.6;
    overflow-x: hidden;
    transition: background-color 0.4s ease, color 0.4s ease;
}

h1, h2, h3, h4 {
    font-family: var(--font-heading);
    font-weight: 700;
    letter-spacing: -0.02em;
    line-height: 1.25;
}

/* Decorative Background Orbs */
.bg-gradient-orb {
    position: absolute;
    width: 600px;
    height: 600px;
    border-radius: 50%;
    filter: blur(140px);
    z-index: -1;
    opacity: 0.15;
    pointer-events: none;
    transition: opacity 0.5s ease;
}

body.light-theme .bg-gradient-orb {
    opacity: 0.08;
}

.bg-orb-1 {
    top: -200px;
    left: -100px;
    background: radial-gradient(circle, var(--primary) 0%, transparent 80%);
}

.bg-orb-2 {
    top: 30%;
    right: -200px;
    background: radial-gradient(circle, var(--secondary) 0%, transparent 80%);
}

.bg-orb-3 {
    bottom: -100px;
    left: 20%;
    background: radial-gradient(circle, #06B6D4 0%, transparent 80%);
}

/* Layout Utilities */
.main-layout {
    max-width: 1200px;
    margin: 0 auto;
    padding: 100px 24px 60px;
    min-height: calc(100vh - 120px);
}

/* Navigation Bar */
.navbar {
    position: fixed;
    top: 0;
    left: 0;
    right: 0;
    height: 80px;
    z-index: 1000;
    backdrop-filter: blur(16px);
    -webkit-backdrop-filter: blur(16px);
    background-color: var(--bg-nav);
    border-bottom: 1px solid var(--border-color);
    transition: background-color 0.4s ease, border-color 0.4s ease;
}

.nav-container {
    max-width: 1200px;
    height: 100%;
    margin: 0 auto;
    display: flex;
    align-items: center;
    justify-content: space-between;
    padding: 0 24px;
}

.nav-brand {
    display: flex;
    align-items: center;
    text-decoration: none;
    gap: 12px;
}

.nav-logo {
    width: 44px;
    height: 44px;
    border-radius: 10px;
    object-fit: cover;
    box-shadow: 0 4px 12px rgba(var(--primary-rgb), 0.2);
}

.nav-brand-text {
    display: flex;
    flex-direction: column;
}

.brand-title {
    font-family: var(--font-heading);
    font-size: 1.25rem;
    font-weight: 800;
    color: var(--text-primary);
    letter-spacing: -0.01em;
}

.brand-subtitle {
    font-size: 0.8rem;
    font-weight: 500;
    color: var(--primary);
    text-transform: uppercase;
    letter-spacing: 0.05em;
}

.nav-actions {
    display: flex;
    align-items: center;
    gap: 16px;
}

/* Buttons */
.btn {
    display: inline-flex;
    align-items: center;
    justify-content: center;
    font-family: var(--font-heading);
    font-weight: 600;
    font-size: 0.95rem;
    padding: 10px 20px;
    border-radius: var(--radius-sm);
    border: none;
    cursor: pointer;
    text-decoration: none;
    transition: var(--transition);
}

.btn-primary {
    background-color: var(--primary);
    color: #FFFFFF;
}

.btn-primary:hover {
    background-color: var(--primary-hover);
    transform: translateY(-2px);
    box-shadow: 0 6px 20px rgba(var(--primary-rgb), 0.4);
}

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

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

.btn-glass {
    background: rgba(255, 255, 255, 0.05);
    color: var(--text-primary);
    border: 1px solid rgba(255, 255, 255, 0.1);
    backdrop-filter: blur(8px);
}

.btn-glass:hover {
    background: rgba(255, 255, 255, 0.1);
    transform: translateY(-2px);
}

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

.btn-danger:hover {
    background-color: #DC2626;
}

.btn-lg {
    padding: 14px 28px;
    font-size: 1.05rem;
    border-radius: var(--radius-md);
}

.btn-sm {
    padding: 6px 12px;
    font-size: 0.85rem;
}

.btn-block {
    width: 100%;
    padding: 12px;
}

/* Theme Toggle */
.theme-toggle {
    background: transparent;
    border: 1px solid var(--border-color);
    width: 40px;
    height: 40px;
    border-radius: 50%;
    cursor: pointer;
    display: flex;
    align-items: center;
    justify-content: center;
    font-size: 1.1rem;
    color: var(--text-primary);
    transition: var(--transition);
}

.theme-toggle:hover {
    background-color: var(--border-color);
    transform: rotate(15deg);
}

/* Glassmorphism Panel */
.glass-panel {
    background: var(--card-bg);
    border: 1px solid var(--border-color);
    border-radius: var(--radius-md);
    backdrop-filter: blur(12px);
    -webkit-backdrop-filter: blur(12px);
    padding: 24px;
    transition: var(--transition);
}

/* API Status Indicator */
.api-status-container {
    display: flex;
    justify-content: flex-end;
    margin-bottom: 24px;
}

.status-badge {
    display: inline-flex;
    align-items: center;
    gap: 8px;
    font-size: 0.85rem;
    font-weight: 500;
    padding: 6px 12px;
    border-radius: 50px;
    border: 1px solid var(--border-color);
    background-color: var(--card-bg);
}

.status-dot {
    width: 8px;
    height: 8px;
    border-radius: 50%;
    display: inline-block;
}

.status-checking .status-dot {
    background-color: var(--warning);
    box-shadow: 0 0 8px var(--warning);
    animation: pulse 1.5s infinite;
}

.status-online .status-dot {
    background-color: var(--success);
    box-shadow: 0 0 8px var(--success);
}

.status-offline .status-dot {
    background-color: var(--danger);
    box-shadow: 0 0 8px var(--danger);
}

@keyframes pulse {
    0%, 100% { opacity: 0.5; }
    50% { opacity: 1; }
}

/* App Views Routing System */
.app-view {
    display: none;
    animation: fadeIn 0.4s ease forwards;
}

.app-view.active {
    display: block;
}

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

/* Hero Section */
.hero-section {
    text-align: center;
    max-width: 800px;
    margin: 40px auto 60px;
}

.hero-section h1 {
    font-size: 3rem;
    font-weight: 800;
    margin-bottom: 20px;
    background: linear-gradient(135deg, var(--text-primary) 30%, var(--primary) 70%, var(--secondary) 100%);
    -webkit-background-clip: text;
    -webkit-text-fill-color: transparent;
}

.hero-subtitle {
    font-size: 1.2rem;
    color: var(--text-secondary);
    margin-bottom: 32px;
}

.hero-cta {
    display: flex;
    justify-content: center;
    gap: 16px;
}

/* Stats Section */
.stats-grid {
    display: grid;
    grid-template-columns: repeat(3, 1fr);
    gap: 24px;
    margin-bottom: 60px;
}

.stat-card {
    text-align: center;
    padding: 30px;
}

.stat-number {
    display: block;
    font-family: var(--font-heading);
    font-size: 2.5rem;
    font-weight: 800;
    color: var(--primary);
    margin-bottom: 6px;
}

.stat-label {
    font-size: 1rem;
    color: var(--text-secondary);
    font-weight: 500;
}

/* Section Titles */
.section-title-wrapper {
    margin-bottom: 30px;
}

.section-title-wrapper h2 {
    font-size: 1.75rem;
    margin-bottom: 6px;
}

.section-title-wrapper p {
    color: var(--text-secondary);
}

/* Tab Controls */
.category-tabs {
    display: flex;
    gap: 12px;
    margin-bottom: 30px;
    border-bottom: 1px solid var(--border-color);
    padding-bottom: 12px;
}

.tab-btn {
    background: transparent;
    border: none;
    color: var(--text-secondary);
    font-family: var(--font-heading);
    font-weight: 600;
    font-size: 1.05rem;
    padding: 10px 20px;
    cursor: pointer;
    border-radius: var(--radius-sm);
    display: flex;
    align-items: center;
    gap: 8px;
    transition: var(--transition);
}

.tab-btn:hover {
    color: var(--text-primary);
    background-color: var(--border-color);
}

.tab-btn.active {
    color: #FFFFFF;
    background-color: var(--primary);
}

.content-panel {
    display: none;
}

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

/* Chapters & Quizzes List View (App-like layout) */
.chapters-grid, .quizzes-grid {
    display: flex;
    flex-direction: column;
    gap: 16px;
    max-width: 800px;
    margin: 0 auto;
}

.chapter-card, .quiz-card-item {
    display: flex;
    align-items: center;
    justify-content: space-between;
    cursor: pointer;
    background: var(--card-bg);
    border: 1px solid var(--border-color);
    border-radius: var(--radius-md);
    backdrop-filter: blur(12px);
    -webkit-backdrop-filter: blur(12px);
    padding: 16px 24px;
    transition: var(--transition);
    width: 100%;
}

.chapter-card:hover, .quiz-card-item:hover {
    background-color: var(--card-bg-hover);
    transform: translateY(-2px);
    border-color: rgba(var(--primary-rgb), 0.3);
    box-shadow: 0 8px 20px rgba(0, 0, 0, 0.1);
}

.chapter-card-left, .quiz-card-left {
    display: flex;
    align-items: center;
    gap: 20px;
    flex: 1;
    text-align: left;
}

.chapter-icon {
    font-size: 1.8rem;
    background-color: rgba(var(--primary-rgb), 0.1);
    width: 48px;
    height: 48px;
    border-radius: 12px;
    display: flex;
    align-items: center;
    justify-content: center;
    flex-shrink: 0;
}

.chapter-card-text, .quiz-card-text {
    display: flex;
    flex-direction: column;
    gap: 4px;
}

.chapter-card h3, .quiz-card-item h3 {
    font-size: 1.15rem;
    font-weight: 600;
    margin-bottom: 0;
}

.chapter-card p, .quiz-card-item p {
    color: var(--text-secondary);
    font-size: 0.9rem;
    display: -webkit-box;
    -webkit-line-clamp: 1;
    -webkit-box-orient: vertical;
    overflow: hidden;
    margin-bottom: 0;
}

.chapter-card-meta, .quiz-card-meta {
    display: flex;
    align-items: center;
    gap: 8px;
}

.chapter-badge, .quiz-badge {
    background-color: rgba(var(--primary-rgb), 0.15);
    color: var(--primary);
    font-size: 0.75rem;
    font-weight: 600;
    padding: 2px 10px;
    border-radius: 20px;
    text-transform: uppercase;
    width: fit-content;
}

.chapter-card-right, .quiz-card-right {
    font-size: 1.6rem;
    color: var(--primary);
    font-weight: 600;
    transition: var(--transition);
    user-select: none;
    margin-left: 12px;
}

.chapter-card:hover .chapter-card-right, .quiz-card-item:hover .quiz-card-right {
    transform: translateX(4px);
    color: var(--primary-hover);
}

/* View Header */
.view-header {
    margin-bottom: 40px;
}

.btn-back {
    background: transparent;
    border: none;
    color: var(--primary);
    font-weight: 600;
    cursor: pointer;
    font-size: 1rem;
    margin-bottom: 16px;
    transition: var(--transition);
}

.btn-back:hover {
    color: var(--primary-hover);
    transform: translateX(-4px);
}

.chapter-desc {
    color: var(--text-secondary);
    margin-top: 6px;
}

/* Quiz Interface Styles */
.quiz-play-header {
    display: flex;
    justify-content: space-between;
    align-items: center;
    margin-bottom: 24px;
}

.quiz-info-mini h3 {
    font-size: 1.4rem;
    margin-top: 4px;
}

.quiz-progress-bar-wrapper {
    margin-bottom: 30px;
}

.quiz-progress-info {
    display: flex;
    justify-content: space-between;
    font-size: 0.95rem;
    font-weight: 600;
    margin-bottom: 8px;
}

#quiz-timer {
    color: var(--secondary);
}

.progress-bar-bg {
    height: 8px;
    background-color: var(--border-color);
    border-radius: 4px;
    overflow: hidden;
}

.progress-bar-fill {
    height: 100%;
    background: linear-gradient(90deg, var(--primary) 0%, var(--secondary) 100%);
    border-radius: 4px;
    transition: width 0.3s ease;
}

.quiz-question-card {
    margin-bottom: 30px;
    min-height: 200px;
    flex-shrink: 0;
}

.question-text {
    font-size: 1.3rem;
    font-weight: 600;
    margin-bottom: 24px;
    font-family: var(--font-body);
}

.options-list {
    display: flex;
    flex-direction: column;
    gap: 12px;
    margin-bottom: 24px;
}

.option-item {
    display: flex;
    align-items: center;
    padding: 16px 20px;
    border: 1px solid var(--border-color);
    border-radius: var(--radius-sm);
    background-color: rgba(255, 255, 255, 0.02);
    cursor: pointer;
    font-size: 1.05rem;
    font-weight: 500;
    transition: var(--transition);
}

.option-item:hover:not(.selected):not(.correct):not(.incorrect) {
    background-color: var(--border-color);
    border-color: var(--text-muted);
}

.option-prefix {
    width: 32px;
    height: 32px;
    border-radius: 50%;
    background-color: var(--border-color);
    color: var(--text-secondary);
    display: inline-flex;
    align-items: center;
    justify-content: center;
    font-weight: 700;
    margin-right: 16px;
    transition: var(--transition);
}

.option-text {
    flex-grow: 1;
}

/* Quiz Option States */
.option-item.selected {
    border-color: var(--primary);
    background-color: rgba(var(--primary-rgb), 0.08);
}
.option-item.selected .option-prefix {
    background-color: var(--primary);
    color: #FFFFFF;
}

.option-item.correct {
    border-color: var(--success) !important;
    background-color: var(--success-bg) !important;
}
.option-item.correct .option-prefix {
    background-color: var(--success) !important;
    color: #FFFFFF !important;
}

.option-item.incorrect {
    border-color: var(--danger) !important;
    background-color: var(--danger-bg) !important;
}
.option-item.incorrect .option-prefix {
    background-color: var(--danger) !important;
    color: #FFFFFF !important;
}

/* Practice mode: neutral selection highlight (no reveal) */
.option-item.selected-practice {
    border-color: var(--primary) !important;
    background-color: rgba(var(--primary-rgb), 0.1) !important;
}
.option-item.selected-practice .option-prefix {
    background-color: var(--primary) !important;
    color: #FFFFFF !important;
}

/* Explanation Box */
.explanation-box {
    border-top: 1px solid var(--border-color);
    padding-top: 20px;
    margin-top: 20px;
    animation: slideDown 0.3s ease forwards;
}

.explanation-box.hidden {
    display: none;
}

/* Practice mode note: blue info box instead of green explanation */
.explanation-box.practice-note-mode {
    border-top-color: rgba(var(--primary-rgb), 0.3);
    background: rgba(var(--primary-rgb), 0.06);
    border-radius: var(--radius-sm);
    border-left: 3px solid var(--primary);
    border-top: none;
    padding: 14px 16px;
    margin-top: 20px;
}

.explanation-box.practice-note-mode .exp-title {
    display: none; /* hide the '💡 Explanation:' title in practice mode */
}

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

.exp-title {
    font-family: var(--font-heading);
    font-weight: 700;
    color: var(--success);
    margin-bottom: 6px;
}

.exp-content {
    color: var(--text-secondary);
    font-size: 0.95rem;
}

.quiz-controls {
    display: flex;
    justify-content: space-between;
    flex-shrink: 0;
    margin-top: 20px;
    padding-bottom: 10px;
}

.disabled {
    opacity: 0.5;
    cursor: not-allowed;
    pointer-events: none;
}

/* Results view — full desktop layout */
.result-view-section {
    padding: 40px 24px 60px;
    max-width: 1200px;
    margin: 0 auto;
    width: 100%;
}

.result-page-layout {
    display: flex;
    flex-direction: column;
    gap: 32px;
    width: 100%;
}

/* LEFT: Scorecard */
.result-left-panel {
    text-align: center;
    width: 100%;
}

.result-badge-icon {
    font-size: 4rem;
    margin-bottom: 16px;
    animation: bounce 1.5s infinite;
}

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

.result-score-ring {
    width: 180px;
    height: 180px;
    border-radius: 50%;
    background: conic-gradient(var(--primary) 0%, var(--secondary) 80%, var(--border-color) 80%);
    margin: 24px auto;
    display: flex;
    align-items: center;
    justify-content: center;
    padding: 12px;
}

.ring-content {
    background-color: var(--bg-main);
    width: 100%;
    height: 100%;
    border-radius: 50%;
    display: flex;
    flex-direction: column;
    align-items: center;
    justify-content: center;
}

.score-number {
    font-family: var(--font-heading);
    font-size: 2.4rem;
    font-weight: 800;
    color: var(--text-primary);
}

.score-label {
    font-size: 0.85rem;
    color: var(--text-secondary);
    font-weight: 600;
}

.result-stats-grid {
    display: grid;
    grid-template-columns: repeat(3, 1fr);
    gap: 16px;
    margin: 32px 0;
}

.result-stat-item {
    background-color: rgba(255, 255, 255, 0.02);
    border: 1px solid var(--border-color);
    border-radius: var(--radius-sm);
    padding: 12px;
}

.result-stat-item .val {
    display: block;
    font-size: 1.25rem;
    font-weight: 700;
}

.result-stat-item .lbl {
    font-size: 0.8rem;
    color: var(--text-secondary);
}

/* RIGHT: Stats */
.result-right-panel {
    width: 100%;
}

/* ≥992px: True side-by-side */
@media (min-width: 992px) {
    .result-view-section {
        padding: 40px 40px 60px;
    }

    .result-page-layout {
        display: grid;
        grid-template-columns: 380px 1fr;
        gap: 48px;
        align-items: start;
    }

    .result-left-panel {
        position: sticky;
        top: 96px;
    }
}

.result-stats-heading {
    font-size: 1.5rem;
    font-weight: 800;
    margin-bottom: 24px;
    color: var(--text-primary);
}

/* Large stat cards for the right panel */
.result-stats-big {
    grid-template-columns: repeat(3, 1fr) !important;
    gap: 20px !important;
    margin-bottom: 32px;
}

.result-stat-big {
    padding: 28px 20px !important;
    border-radius: var(--radius-md) !important;
    text-align: center;
}

.result-stat-big .val {
    font-size: 2.4rem !important;
    font-weight: 800 !important;
}

.result-stat-big .lbl {
    font-size: 0.9rem !important;
    margin-top: 6px;
    display: block;
}

.correct-stat {
    background: var(--success-bg) !important;
    border-color: var(--success) !important;
}

.wrong-stat {
    background: var(--danger-bg) !important;
    border-color: var(--danger) !important;
}

/* Insight Box */
.result-insight-box {
    text-align: left;
    padding: 20px 24px !important;
    border-radius: var(--radius-md) !important;
}

.insight-label {
    font-size: 0.9rem;
    font-weight: 700;
    color: var(--primary);
    margin-bottom: 8px;
}

.insight-text {
    font-size: 1rem;
    color: var(--text-secondary);
    line-height: 1.6;
}

.result-actions {
    display: flex;
    flex-direction: column;
    gap: 12px;
}

/* Download Banner */
.download-banner {
    display: flex;
    align-items: center;
    justify-content: space-between;
    margin-top: 80px;
    gap: 40px;
    overflow: hidden;
}

.download-content {
    flex: 1;
}

.download-content h3 {
    font-size: 1.8rem;
    margin-bottom: 12px;
}

.download-content p {
    color: var(--text-secondary);
    margin-bottom: 24px;
}

.download-buttons a {
    text-decoration: none;
    font-size: 1.05rem;
}

.download-mockup {
    width: 200px;
    display: flex;
    align-items: center;
    justify-content: center;
}

.mockup-img {
    width: 140px;
    height: 140px;
    border-radius: 30px;
    object-fit: cover;
    box-shadow: 0 10px 30px rgba(var(--primary-rgb), 0.3);
    animation: rotateSlow 20s linear infinite;
}

@keyframes rotateSlow {
    from { transform: rotate(0deg); }
    to { transform: rotate(360deg); }
}

/* Footer */
.footer {
    border-top: 1px solid var(--border-color);
    padding: 40px 24px;
    text-align: center;
    background-color: rgba(11, 15, 25, 0.9);
}

.footer-container {
    max-width: 1200px;
    margin: 0 auto;
}

.footer p {
    color: var(--text-muted);
    font-size: 0.95rem;
}

.footer-sub {
    font-size: 0.85rem;
    margin-top: 6px;
}

/* Helper text colors */
.text-success { color: var(--success); }
.text-danger { color: var(--danger); }



/* Fullscreen Quiz Interface Styles */
body.quiz-mode-active {
    overflow: hidden !important;
    height: 100vh !important;
    height: 100dvh !important;
    margin: 0 !important;
    padding: 0 !important;
}

body.quiz-mode-active .navbar,
body.quiz-mode-active .footer,
body.quiz-mode-active .download-banner,
body.quiz-mode-active .api-status-container {
    display: none !important;
}

body.quiz-mode-active .main-layout {
    max-width: 100% !important;
    width: 100% !important;
    padding: 0 !important;
    height: 100vh !important;
    height: 100dvh !important;
    min-height: 100vh !important;
    min-height: 100dvh !important;
    background-color: var(--bg-main);
    overflow: hidden !important;
}

.quiz-fullscreen-layout {
    display: none;
    flex-direction: column;
    height: 100vh !important;
    height: 100dvh !important;
    width: 100%;
    overflow: hidden !important;
}

.quiz-fullscreen-layout.active {
    display: flex !important;
}

.quiz-fullscreen-header {
    height: 80px;
    background-color: var(--bg-nav);
    backdrop-filter: blur(16px);
    -webkit-backdrop-filter: blur(16px);
    border-bottom: 1px solid var(--border-color);
    display: flex;
    align-items: center;
    justify-content: space-between;
    padding: 0 32px;
    flex-shrink: 0;
    transition: var(--transition);
}

.quiz-header-left {
    display: flex;
    align-items: center;
    gap: 12px;
}

.quiz-header-title-group {
    display: flex;
    flex-direction: column;
    gap: 4px;
}

.quiz-header-title-group h2,
.quiz-header-title-group h3 {
    margin: 0 !important;
    padding: 0 !important;
    line-height: 1.2 !important;
}

.quiz-header-logo {
    width: 36px;
    height: 36px;
    border-radius: 8px;
    object-fit: cover;
    box-shadow: 0 4px 12px rgba(var(--primary-rgb), 0.2);
}

.quiz-header-right {
    display: flex;
    align-items: center;
    gap: 16px;
}

.quiz-header-right #quiz-timer {
    font-size: 1.25rem;
    font-weight: 700;
    font-family: var(--font-heading);
    color: var(--secondary);
}

.quiz-fullscreen-body {
    display: flex;
    flex: 1;
    overflow: hidden;
    width: 100%;
    height: calc(100vh - 80px) !important;
}

.quiz-main-content {
    flex: 1;
    padding: 32px 48px;
    overflow-y: auto;
    display: flex;
    flex-direction: column;
    justify-content: space-between;
    height: 100%;
}

.quiz-sidebar {
    width: 320px;
    border-left: 1px solid var(--border-color);
    border-radius: 0 !important;
    border-top: none;
    border-bottom: none;
    border-right: none;
    background-color: rgba(15, 23, 42, 0.2);
    display: flex;
    flex-direction: column;
    padding: 30px 24px;
    flex-shrink: 0;
    overflow-y: auto;
    transition: var(--transition);
}

.sidebar-section h4 {
    font-size: 1.2rem;
    font-weight: 700;
    margin-bottom: 4px;
}

.sidebar-help {
    font-size: 0.85rem;
    color: var(--text-secondary);
    margin-bottom: 24px;
}

/* Question Palette Grid */
.question-palette-grid {
    display: grid;
    grid-template-columns: repeat(5, 1fr);
    gap: 10px;
    margin-bottom: 30px;
}

.palette-btn {
    width: 42px;
    height: 42px;
    border-radius: 8px;
    border: 1px solid var(--border-color);
    background-color: rgba(255, 255, 255, 0.02);
    color: var(--text-secondary);
    display: flex;
    align-items: center;
    justify-content: center;
    font-weight: 700;
    font-size: 0.95rem;
    cursor: pointer;
    transition: var(--transition);
}

.palette-btn:hover {
    background-color: var(--border-color);
    color: var(--text-primary);
}

/* Palette button states */
.palette-btn.active {
    border-color: var(--primary) !important;
    border-width: 2px;
    color: var(--primary) !important;
    background-color: rgba(var(--primary-rgb), 0.1);
}

.palette-btn.unattempted {
    border-color: var(--border-color);
}

.palette-btn.attempted {
    background-color: var(--success-bg);
    border-color: var(--success);
    color: var(--success);
}

/* Palette Legend */
.palette-legend {
    display: flex;
    flex-direction: column;
    gap: 12px;
    margin-bottom: auto; /* pushes submit button to bottom */
    padding: 20px 0;
    border-top: 1px solid var(--border-color);
}

.legend-item {
    display: flex;
    align-items: center;
    gap: 10px;
    font-size: 0.9rem;
    font-weight: 500;
    color: var(--text-secondary);
}

.legend-dot {
    width: 14px;
    height: 14px;
    border-radius: 4px;
    border: 1px solid var(--border-color);
}

.legend-dot.unattempted {
    background-color: rgba(255, 255, 255, 0.02);
}

.legend-dot.attempted {
    background-color: var(--success-bg);
    border-color: var(--success);
}

.legend-dot.active {
    border-color: var(--primary);
    border-width: 2px;
}

.sidebar-actions {
    margin-top: 30px;
}

/* Base style overrides for collapsible palette drawer */
#btn-toggle-palette {
    display: none !important;
}

.drawer-header {
    display: none !important;
}

.desktop-only-heading {
    display: block;
}

.drawer-overlay {
    display: none;
    position: fixed;
    inset: 0;
    background: rgba(0, 0, 0, 0.6);
    backdrop-filter: blur(4px);
    z-index: 2000;
}

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

/* =============================================
   MODE SELECTION MODAL
   ============================================= */
.mode-modal-overlay {
    display: none;
    position: fixed;
    inset: 0;
    background: rgba(0, 0, 0, 0.6);
    backdrop-filter: blur(8px);
    z-index: 9999;
    align-items: center;
    justify-content: center;
    padding: 20px;
}

.mode-modal-overlay.active {
    display: flex;
}

.mode-modal {
    max-width: 520px;
    width: 100%;
    padding: 36px;
    border-radius: var(--radius-lg);
    animation: modalSlideIn 0.35s cubic-bezier(0.34, 1.56, 0.64, 1);
}

@keyframes modalSlideIn {
    from { opacity: 0; transform: translateY(30px) scale(0.96); }
    to   { opacity: 1; transform: translateY(0) scale(1); }
}

.mode-modal-header {
    text-align: center;
    margin-bottom: 28px;
}

.mode-modal-logo {
    width: 56px;
    height: 56px;
    border-radius: 14px;
    margin-bottom: 12px;
    object-fit: contain;
}

.mode-modal-header h3 {
    font-size: 1.2rem;
    color: var(--text-primary);
    margin-bottom: 6px;
}

.mode-modal-subtitle {
    font-size: 0.9rem;
    color: var(--text-secondary);
}

.mode-cards {
    display: flex;
    flex-direction: column;
    gap: 14px;
    margin-bottom: 20px;
}

.mode-card {
    display: flex;
    align-items: center;
    gap: 16px;
    padding: 18px 20px;
    border-radius: var(--radius-md);
    border: 2px solid var(--border-color);
    background: var(--card-bg);
    cursor: pointer;
    text-align: left;
    transition: var(--transition);
    position: relative;
    overflow: hidden;
}

.mode-card:hover {
    border-color: var(--primary);
    background: var(--card-bg-hover);
    transform: translateY(-2px);
    box-shadow: 0 8px 24px rgba(var(--primary-rgb), 0.2);
}

.mode-card-icon {
    font-size: 2rem;
    flex-shrink: 0;
}

.mode-card-body h4 {
    font-size: 1rem;
    font-weight: 700;
    color: var(--text-primary);
    margin-bottom: 4px;
}

.mode-card-body p {
    font-size: 0.82rem;
    color: var(--text-secondary);
    line-height: 1.4;
}

.mode-card-badge {
    position: absolute;
    top: 12px;
    right: 12px;
    font-size: 0.7rem;
    font-weight: 700;
    letter-spacing: 0.05em;
    text-transform: uppercase;
    background: linear-gradient(135deg, var(--primary), var(--secondary));
    color: #fff;
    padding: 3px 9px;
    border-radius: 20px;
}

/* =============================================
   QUIZ MODE BADGE IN HEADER
   ============================================= */
.quiz-header-title-group {
    display: flex;
    flex-direction: column;
    gap: 4px;
}

.quiz-mode-badge {
    display: inline-block;
    font-size: 0.7rem;
    font-weight: 700;
    letter-spacing: 0.06em;
    text-transform: uppercase;
    padding: 2px 10px;
    border-radius: 20px;
    color: #fff;
    background: linear-gradient(135deg, var(--primary), var(--primary-hover));
    width: fit-content;
}

.quiz-mode-badge.solution {
    background: linear-gradient(135deg, var(--secondary), var(--secondary-hover));
}

/* Practice mode: palette shows answered but not correct/wrong */
body.practice-mode .option-item.correct,
body.practice-mode .option-item.incorrect {
    /* Override — will be applied via JS flag, not CSS */
}

/* =============================================
   BTN SUCCESS
   ============================================= */
.btn-success {
    background: linear-gradient(135deg, #10B981, #059669);
    color: #fff;
    border: none;
}

.btn-success:hover {
    background: linear-gradient(135deg, #059669, #047857);
    transform: translateY(-1px);
}

/* =============================================
   QUIZ REVIEW SECTION
   ============================================= */
.review-header {
    padding: 32px 40px 20px;
    border-bottom: 1px solid var(--border-color);
    display: flex;
    flex-direction: column;
    gap: 8px;
}

.review-header h2 {
    font-size: 1.6rem;
}

.review-subtitle {
    color: var(--text-secondary);
    font-size: 0.9rem;
}

.review-list {
    padding: 32px 40px;
    display: flex;
    flex-direction: column;
    gap: 20px;
    max-width: 900px;
    margin: 0 auto;
    width: 100%;
}

.review-card {
    border-radius: var(--radius-md);
    border: 2px solid var(--border-color);
    background: var(--card-bg);
    overflow: hidden;
    transition: var(--transition);
}

.review-card.review-correct {
    border-color: var(--success);
}

.review-card.review-wrong {
    border-color: var(--danger);
}

.review-card.review-skipped {
    border-color: var(--warning);
}

.review-card-header {
    display: flex;
    align-items: center;
    justify-content: space-between;
    padding: 14px 20px;
    font-size: 0.85rem;
    font-weight: 700;
    border-bottom: 1px solid var(--border-color);
}

.review-card-header .q-num {
    color: var(--text-secondary);
}

.review-status-badge {
    padding: 3px 12px;
    border-radius: 20px;
    font-size: 0.75rem;
    font-weight: 700;
    text-transform: uppercase;
    letter-spacing: 0.05em;
}

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

.review-status-badge.wrong-badge {
    background: var(--danger-bg);
    color: var(--danger);
}

.review-status-badge.skipped-badge {
    background: rgba(245, 158, 11, 0.15);
    color: var(--warning);
}

.review-card-body {
    padding: 20px;
}

.review-question-text {
    font-size: 1rem;
    font-weight: 600;
    color: var(--text-primary);
    margin-bottom: 16px;
    line-height: 1.5;
}

.review-options {
    display: flex;
    flex-direction: column;
    gap: 8px;
    margin-bottom: 14px;
}

.review-option {
    display: flex;
    align-items: center;
    gap: 12px;
    padding: 10px 14px;
    border-radius: var(--radius-sm);
    font-size: 0.9rem;
    border: 1px solid var(--border-color);
    background: transparent;
}

.review-option.review-opt-correct {
    background: var(--success-bg);
    border-color: var(--success);
    color: var(--success);
    font-weight: 600;
}

.review-option.review-opt-user-wrong {
    background: var(--danger-bg);
    border-color: var(--danger);
    color: var(--danger);
    font-weight: 600;
}

.review-option-prefix {
    font-weight: 800;
    font-size: 0.85rem;
    min-width: 22px;
}

.review-explanation {
    margin-top: 12px;
    padding: 12px 16px;
    background: rgba(var(--primary-rgb), 0.08);
    border-radius: var(--radius-sm);
    border-left: 3px solid var(--primary);
    font-size: 0.88rem;
    color: var(--text-secondary);
    line-height: 1.5;
}

.review-explanation .exp-label {
    font-weight: 700;
    color: var(--primary);
    margin-bottom: 4px;
    display: block;
}

/* Hamburger button (mobile) */
.hamburger {
    display: none;
    flex-direction: column;
    gap: 5px;
    width: 40px;
    height: 40px;
    border-radius: 8px;
    border: 1px solid var(--border-color);
    background: var(--card-bg);
    align-items: center;
    justify-content: center;
    cursor: pointer;
    transition: var(--transition);
}

.hamburger span {
    display: block;
    width: 20px;
    height: 2px;
    background: var(--text-primary);
    border-radius: 2px;
    transition: var(--transition);
}

.hamburger.active span:nth-child(1) { transform: translateY(7px) rotate(45deg); }
.hamburger.active span:nth-child(2) { opacity: 0; }
.hamburger.active span:nth-child(3) { transform: translateY(-7px) rotate(-45deg); }

/* Nav links (visible on desktop, toggleable on mobile) */
.nav-links {
    display: flex;
    align-items: center;
    gap: 8px;
}

.nav-link {
    padding: 8px 14px;
    border-radius: var(--radius-sm);
    font-size: 0.9rem;
    font-weight: 500;
    color: var(--text-secondary);
    text-decoration: none;
    transition: var(--transition);
}

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

.nav-link.active {
    color: var(--primary);
    font-weight: 600;
}

/* Footer Grid Layout */
.footer {
    border-top: 1px solid var(--border-color);
    background-color: var(--bg-main);
    margin-top: 0;
}

.footer-inner {
    max-width: 1200px;
    margin: 0 auto;
    display: grid;
    grid-template-columns: 1.5fr 1fr;
    gap: 48px;
    padding: 56px 24px 40px;
    align-items: start;
}

.footer-brand {
    display: flex;
    flex-direction: column;
    gap: 16px;
}

.footer-tagline {
    font-size: 0.9rem;
    color: var(--text-secondary);
    line-height: 1.6;
    max-width: 340px;
}

.footer-links-grid {
    display: grid;
    grid-template-columns: repeat(3, 1fr);
    gap: 32px;
}

.footer-col h4 {
    font-size: 0.85rem;
    font-weight: 700;
    text-transform: uppercase;
    letter-spacing: 0.06em;
    color: var(--text-muted);
    margin-bottom: 16px;
}

.footer-col ul {
    list-style: none;
    display: flex;
    flex-direction: column;
    gap: 10px;
}

.footer-col ul li a,
.footer-col ul li span {
    font-size: 0.9rem;
    color: var(--text-secondary);
    transition: var(--transition);
    text-decoration: none;
}

.footer-col ul li a:hover {
    color: var(--primary);
}

.footer-bottom {
    border-top: 1px solid var(--border-color);
    padding: 20px 24px;
    text-align: center;
    font-size: 0.82rem;
    color: var(--text-muted);
    max-width: 1200px;
    margin: 0 auto;
}

/* =============================================
   RESPONSIVE BREAKPOINTS — UNIFIED (SINGLE SOURCE)
   ============================================= */

/* ≤1024px — Large tablet: 2-column grids */
@media (max-width: 1024px) {
    .chapters-grid {
        grid-template-columns: repeat(2, 1fr);
    }

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

    .result-page-layout {
        grid-template-columns: 300px 1fr;
        gap: 28px;
    }
}

/* ≤992px — Tablet */
@media (max-width: 992px) {
    /* Quiz fullscreen layout adjustment for drawer */
    .quiz-fullscreen-body {
        flex-direction: row;
        overflow: hidden;
    }

    .quiz-main-content {
        padding: 20px 16px;
        overflow-y: auto;
        flex: 1;
        height: 100%;
    }

    .quiz-sidebar {
        position: fixed;
        top: 0;
        right: 0;
        width: 320px;
        height: 100vh;
        height: 100dvh;
        z-index: 2100;
        background: var(--card-bg);
        border-left: 1px solid var(--border-color);
        border-top: none;
        border-bottom: none;
        border-right: none;
        border-radius: 0 !important;
        padding: 24px;
        flex: none;
        overflow-y: auto;
        transform: translateX(100%);
        transition: transform 0.3s cubic-bezier(0.4, 0, 0.2, 1);
        display: flex;
        flex-direction: column;
    }

    .quiz-sidebar.open {
        transform: translateX(0);
        box-shadow: -10px 0 30px rgba(0, 0, 0, 0.25);
    }

    #btn-toggle-palette {
        display: inline-flex !important;
        align-items: center;
        gap: 6px;
    }

    .drawer-header {
        display: flex !important;
        align-items: center;
        justify-content: space-between;
        margin-bottom: 20px;
        border-bottom: 1px solid var(--border-color);
        padding-bottom: 12px;
    }

    .desktop-only-heading {
        display: none !important;
    }

    /* Results two-col → single col */
    .result-page-layout {
        display: flex !important;
        flex-direction: column;
        gap: 24px;
    }

    .result-left-panel {
        position: static !important;
        max-width: 480px;
        width: 100%;
        margin: 0 auto;
    }

    .result-right-panel {
        width: 100%;
    }

    .result-stats-big {
        grid-template-columns: repeat(3, 1fr) !important;
    }

    /* Footer */
    .footer-inner {
        grid-template-columns: 1fr;
        gap: 32px;
        padding: 40px 24px 32px;
    }

    .footer-links-grid {
        grid-template-columns: repeat(2, 1fr);
        gap: 24px;
    }

    /* Download banner */
    .download-banner {
        flex-direction: column;
        text-align: center;
        padding: 32px 24px;
        gap: 24px;
    }

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

/* ≤768px — Mobile */
@media (max-width: 768px) {
    /* ---- LAYOUT ---- */
    .main-layout {
        padding: 88px 16px 40px;
    }

    /* ---- NAV ---- */
    .nav-links {
        display: none;
        flex-direction: column;
        position: fixed;
        top: 80px;
        left: 0;
        right: 0;
        background: var(--bg-nav);
        backdrop-filter: blur(16px);
        -webkit-backdrop-filter: blur(16px);
        border-bottom: 1px solid var(--border-color);
        padding: 16px 24px;
        gap: 4px;
        z-index: 999;
        align-items: flex-start;
    }

    .nav-links.open {
        display: flex;
    }

    .nav-link {
        padding: 12px 0;
        border-bottom: 1px solid var(--border-color);
        width: 100%;
        font-size: 1rem;
    }

    .nav-link:last-child { border-bottom: none; }

    .hamburger {
        display: flex;
    }

    .nav-container {
        padding: 0 16px;
    }

    .brand-subtitle { display: none; }

    /* ---- HERO ---- */
    .hero-section {
        padding: 20px 0 40px;
    }

    .hero-section h1 {
        font-size: 2rem;
        line-height: 1.25;
    }

    .hero-subtitle {
        font-size: 0.95rem;
    }

    /* ---- STATS ---- */
    .stats-grid {
        grid-template-columns: 1fr;
        gap: 12px;
    }

    /* ---- CATEGORY TABS ---- */
    .category-tabs {
        flex-wrap: wrap;
        gap: 8px;
    }

    .tab-btn {
        padding: 9px 16px;
        font-size: 0.88rem;
    }

    /* ---- GRIDS ---- */
    .chapters-grid {
        grid-template-columns: 1fr;
    }

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

    /* ---- QUIZ FULLSCREEN HEADER ---- */
    .quiz-fullscreen-header {
        padding: 0 16px;
        height: 64px;
    }

    .quiz-header-logo {
        width: 28px;
        height: 28px;
    }

    .quiz-header-title-group h3 {
        font-size: 0.9rem;
        max-width: 130px;
        overflow: hidden;
        text-overflow: ellipsis;
        white-space: nowrap;
    }

    /* ---- QUIZ MAIN CONTENT ---- */
    .quiz-main-content {
        padding: 16px;
    }

    .quiz-question-card {
        padding: 18px 14px;
        margin-bottom: 18px;
    }

    .question-text {
        font-size: 1.05rem;
        line-height: 1.5;
    }

    .option-item {
        padding: 12px 16px;
        font-size: 0.95rem;
    }

    .option-prefix {
        width: 28px;
        height: 28px;
        font-size: 0.85rem;
        margin-right: 12px;
    }

    .quiz-controls {
        flex-wrap: wrap;
        gap: 10px;
    }

    .quiz-controls .btn {
        flex: 1;
        text-align: center;
        padding: 10px 14px;
        font-size: 0.9rem;
    }

    /* ---- QUIZ SIDEBAR ---- */
    .quiz-sidebar {
        padding: 18px;
    }

    .question-palette-grid {
        gap: 8px;
    }

    .palette-btn {
        width: 38px;
        height: 38px;
        font-size: 0.8rem;
    }

    /* ---- RESULTS PAGE ---- */
    .result-view-section {
        padding: 16px 16px 40px;
    }

    .result-left-panel {
        padding: 24px 18px;
        max-width: 100%;
    }

    .result-stats-big {
        grid-template-columns: 1fr !important;
        gap: 12px !important;
    }

    .result-stat-big {
        padding: 18px 16px !important;
    }

    .result-stat-big .val {
        font-size: 1.8rem !important;
    }

    .result-actions {
        flex-direction: column;
        gap: 10px;
    }

    .result-actions .btn {
        width: 100%;
        text-align: center;
    }

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

    /* ---- REVIEW PAGE ---- */
    .review-header {
        padding: 16px 20px 14px;
    }

    .review-header h2 {
        font-size: 1.2rem;
    }

    .review-list {
        padding: 16px;
        gap: 14px;
    }

    .review-card {
        padding: 16px 14px;
    }

    .review-card-header {
        flex-wrap: wrap;
        gap: 8px;
    }

    .review-options {
        gap: 6px;
    }

    .review-option {
        padding: 10px 12px;
        font-size: 0.9rem;
    }

    /* ---- DOWNLOAD BANNER ---- */
    .download-banner {
        flex-direction: column;
        text-align: center;
        padding: 28px 20px;
        gap: 20px;
        margin-top: 40px;
    }

    /* ---- MODE MODAL ---- */
    .mode-modal {
        padding: 24px 18px;
    }

    .mode-cards {
        flex-direction: column;
    }

    /* ---- FOOTER ---- */
    .footer-inner {
        grid-template-columns: 1fr;
        gap: 28px;
        padding: 36px 20px 28px;
    }

    .footer-links-grid {
        grid-template-columns: repeat(2, 1fr);
        gap: 20px;
    }

    .footer-bottom {
        padding: 16px 20px;
        font-size: 0.8rem;
    }
}

/* ≤480px — Small Mobile */
@media (max-width: 480px) {
    .main-layout {
        padding: 82px 12px 32px;
    }

    /* Hero */
    .hero-section h1 {
        font-size: 1.7rem;
    }

    .hero-cta {
        flex-direction: column;
        gap: 10px;
    }

    .hero-cta .btn {
        width: 100%;
        text-align: center;
    }

    /* Grids */
    .stats-grid {
        grid-template-columns: 1fr;
    }

    /* Quiz header */
    .quiz-fullscreen-header {
        padding: 0 10px;
        height: 58px;
    }

    .quiz-header-title-group h3 {
        display: none;
    }

    /* Quiz options */
    .option-item {
        padding: 10px 12px;
        font-size: 0.9rem;
    }

    .option-prefix {
        width: 26px;
        height: 26px;
        font-size: 0.78rem;
        margin-right: 10px;
    }

    .quiz-controls .btn {
        font-size: 0.82rem;
        padding: 9px 8px;
    }

    /* Quiz sidebar */
    .quiz-sidebar {
        padding: 14px;
    }

    .palette-btn {
        width: 32px;
        height: 32px;
        font-size: 0.75rem;
    }

    /* Results */
    .result-left-panel {
        padding: 20px 14px;
    }

    .result-stats-big {
        grid-template-columns: 1fr !important;
    }

    .result-stat-big .val {
        font-size: 1.6rem !important;
    }

    .result-stats-grid {
        grid-template-columns: 1fr 1fr 1fr;
        gap: 6px;
    }

    /* Review */
    .review-card {
        padding: 14px 12px;
    }

    .review-option {
        font-size: 0.85rem;
        padding: 9px 10px;
    }

    .review-explanation {
        font-size: 0.9rem;
    }

    .review-card-header {
        flex-wrap: wrap;
        gap: 8px;
    }

    /* Footer */
    .footer-links-grid {
        grid-template-columns: 1fr;
    }

    .brand-subtitle {
        display: none;
    }
}