/* Modern CSS UI System for Prayas Plus Main Portal */
:root {
    /* Color Tokens (Dark Theme Defaults matching 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 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 */
* {
    margin: 0;
    padding: 0;
    box-sizing: border-box;
}

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

h1, h2, h3, h4 {
    font-family: var(--font-heading);
    color: var(--text-primary);
    font-weight: 700;
}

a {
    color: inherit;
    text-decoration: none;
}

button {
    font-family: inherit;
    cursor: pointer;
    border: none;
    background: none;
    outline: none;
}

/* Scrollbar Customization */
::-webkit-scrollbar {
    width: 8px;
}
::-webkit-scrollbar-track {
    background: var(--bg-main);
}
::-webkit-scrollbar-thumb {
    background: var(--border-color);
    border-radius: 4px;
}
::-webkit-scrollbar-thumb:hover {
    background: var(--text-muted);
}

/* Layout Utilities */
.container {
    max-width: 1200px;
    margin: 0 auto;
    padding: 0 24px;
}

.hidden {
    display: none !important;
}

/* Modern Header / Navigation */
.header {
    position: sticky;
    top: 0;
    z-index: 1000;
    background-color: var(--bg-nav);
    backdrop-filter: blur(12px);
    -webkit-backdrop-filter: blur(12px);
    border-bottom: 1px solid var(--border-color);
    transition: var(--transition);
}

.nav-container {
    display: flex;
    align-items: center;
    justify-content: space-between;
    height: 70px;
}

/* Nav Brand (synced with upgk) */
.nav-brand {
    display: flex;
    align-items: center;
    text-decoration: none;
    gap: 12px;
    transition: var(--transition);
}

.nav-brand:hover {
    opacity: 0.85;
}

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

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

.brand-title {
    font-family: var(--font-heading);
    font-size: 1.2rem;
    font-weight: 800;
    color: var(--text-primary);
    letter-spacing: -0.01em;
    line-height: 1.2;
}

.brand-subtitle {
    font-size: 0.72rem;
    font-weight: 600;
    color: var(--primary);
    text-transform: uppercase;
    letter-spacing: 0.06em;
}

/* 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 {
    display: flex;
    align-items: center;
    gap: 24px;
}

.nav-link {
    font-size: 0.95rem;
    font-weight: 500;
    color: var(--text-secondary);
    transition: var(--transition);
    position: relative;
    padding: 6px 0;
}

.nav-link::after {
    content: '';
    position: absolute;
    bottom: 0;
    left: 0;
    width: 0;
    height: 2px;
    background: var(--primary);
    transition: var(--transition);
}

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

.nav-link:hover::after {
    width: 100%;
}

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

.nav-link.active::after {
    width: 100%;
}

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

.btn-theme {
    width: 40px;
    height: 40px;
    border-radius: 50%;
    background-color: var(--card-bg);
    border: 1px solid var(--border-color);
    display: flex;
    align-items: center;
    justify-content: center;
    color: var(--text-primary);
    transition: var(--transition);
}

.btn-theme:hover {
    background-color: var(--card-bg-hover);
    transform: rotate(15deg);
}

.btn-primary {
    padding: 10px 20px;
    background-color: var(--primary);
    color: #fff;
    font-weight: 600;
    font-size: 0.9rem;
    border-radius: var(--radius-sm);
    transition: var(--transition);
}

.btn-primary:hover {
    background-color: var(--primary-hover);
    box-shadow: 0 4px 12px rgba(var(--primary-rgb), 0.25);
    transform: translateY(-1px);
}

/* Background Ambient Orbs */
.ambient-bg {
    position: absolute;
    width: 100%;
    height: 100%;
    top: 0;
    left: 0;
    z-index: -1;
    overflow: hidden;
    pointer-events: none;
}

.bg-orb {
    position: absolute;
    width: 400px;
    height: 400px;
    border-radius: 50%;
    opacity: 0.15;
    filter: blur(100px);
}

.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, var(--primary) 0%, transparent 80%);
}

/* Main Content spacing (header is sticky 70px) */
.main-content {
    padding-top: 90px;
}

/* Hero Section */
.hero-section {
    padding: 40px 0 60px 0;
    position: relative;
}

.hero-content {
    text-align: center;
    max-width: 780px;
    margin: 0 auto 48px;
}

.hero-badge {
    display: inline-flex;
    align-items: center;
    gap: 6px;
    font-size: 0.8rem;
    font-weight: 700;
    letter-spacing: 0.05em;
    text-transform: uppercase;
    color: var(--primary);
    background: rgba(var(--primary-rgb), 0.1);
    border: 1px solid rgba(var(--primary-rgb), 0.2);
    padding: 5px 14px;
    border-radius: 20px;
    margin-bottom: 20px;
}

.hero-section h1 {
    font-size: 3rem;
    font-weight: 800;
    margin-bottom: 16px;
    line-height: 1.15;
}

.text-gradient {
    background: linear-gradient(135deg, var(--primary) 0%, var(--secondary) 100%);
    -webkit-background-clip: text;
    -webkit-text-fill-color: transparent;
    background-clip: text;
}

.hero-subtitle {
    font-size: 1.1rem;
    color: var(--text-secondary);
    max-width: 600px;
    margin: 0 auto 28px;
    line-height: 1.7;
}

.hero-stats {
    display: inline-flex;
    align-items: center;
    gap: 24px;
    padding: 16px 32px;
    background: var(--card-bg);
    border: 1px solid var(--border-color);
    border-radius: var(--radius-lg);
    backdrop-filter: blur(8px);
}

.hero-stat {
    display: flex;
    flex-direction: column;
    align-items: center;
    gap: 2px;
}

.hero-stat strong {
    font-size: 1.4rem;
    font-weight: 800;
    font-family: var(--font-heading);
    color: var(--primary);
}

.hero-stat span {
    font-size: 0.75rem;
    color: var(--text-secondary);
    font-weight: 500;
    text-transform: uppercase;
    letter-spacing: 0.04em;
}

.hero-stat-divider {
    width: 1px;
    height: 36px;
    background: var(--border-color);
}

/* Section Header Row */
.section-header-row {
    display: flex;
    align-items: center;
    justify-content: space-between;
    flex-wrap: wrap;
    gap: 16px;
    margin-bottom: 24px;
}

.section-title {
    font-size: 1.6rem;
    font-weight: 800;
}

/* Main Subdirectories Cards (Feature Area) */
.sub-dirs-grid {
    display: grid;
    grid-template-columns: 1fr 1fr;
    gap: 24px;
    margin-bottom: 40px;
}

.dir-card {
    background-color: var(--card-bg);
    border: 1px solid var(--border-color);
    border-radius: var(--radius-md);
    padding: 30px;
    display: flex;
    flex-direction: column;
    justify-content: space-between;
    transition: var(--transition);
    position: relative;
    overflow: hidden;
}

.dir-card::before {
    content: '';
    position: absolute;
    top: 0;
    left: 0;
    width: 4px;
    height: 100%;
    background: var(--primary);
    opacity: 0;
    transition: var(--transition);
}

.dir-card:hover {
    transform: translateY(-4px);
    border-color: var(--primary);
    box-shadow: 0 10px 30px rgba(0,0,0,0.15);
}

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

.dir-card.special::before {
    background: var(--secondary);
}
.dir-card.special:hover {
    border-color: var(--secondary);
}

.dir-header {
    display: flex;
    align-items: center;
    gap: 16px;
    margin-bottom: 16px;
}

.dir-icon {
    font-size: 2.2rem;
}

.dir-title {
    font-size: 1.4rem;
    font-weight: 700;
}

.dir-desc {
    color: var(--text-secondary);
    font-size: 0.95rem;
    margin-bottom: 24px;
}

.btn-dir {
    display: inline-flex;
    align-items: center;
    gap: 8px;
    font-weight: 700;
    color: var(--primary);
    transition: var(--transition);
}

.dir-card.special .btn-dir {
    color: var(--secondary);
}

.btn-dir:hover {
    gap: 12px;
}

/* Category Section - Tab Controls */
.categories-tabs {
    display: flex;
    justify-content: center;
    gap: 16px;
    margin-bottom: 32px;
}

.tab-btn {
    padding: 12px 24px;
    border-radius: 30px;
    font-size: 0.95rem;
    font-weight: 600;
    background-color: var(--card-bg);
    border: 1px solid var(--border-color);
    color: var(--text-secondary);
    transition: var(--transition);
}

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

.tab-btn.active {
    background-color: var(--primary);
    border-color: var(--primary);
    color: #fff;
    box-shadow: 0 4px 12px rgba(var(--primary-rgb), 0.2);
}

/* Grid Layout for Exams & Chapters */
.items-grid {
    display: grid;
    grid-template-columns: repeat(auto-fill, minmax(280px, 1fr));
    gap: 20px;
    margin-bottom: 60px;
}

.item-card {
    background-color: var(--card-bg);
    border: 1px solid var(--border-color);
    border-radius: var(--radius-md);
    padding: 24px;
    transition: var(--transition);
    cursor: pointer;
    display: flex;
    flex-direction: column;
    justify-content: space-between;
}

.item-card:hover {
    transform: translateY(-3px);
    border-color: var(--primary);
    background-color: var(--card-bg-hover);
}

.item-card-header {
    display: flex;
    align-items: center;
    gap: 14px;
    margin-bottom: 14px;
}

.item-emoji {
    font-size: 1.8rem;
}

.item-name {
    font-size: 1.15rem;
    font-weight: 700;
}

.item-desc {
    color: var(--text-secondary);
    font-size: 0.85rem;
    margin-bottom: 16px;
    display: -webkit-box;
    -webkit-line-clamp: 2;
    -webkit-box-orient: vertical;
    overflow: hidden;
}

.item-stats {
    display: flex;
    align-items: center;
    justify-content: space-between;
    font-size: 0.8rem;
    color: var(--text-muted);
    border-top: 1px solid var(--border-color);
    padding-top: 12px;
}

.item-badge {
    padding: 2px 8px;
    border-radius: 12px;
    background-color: rgba(var(--primary-rgb), 0.1);
    color: var(--primary);
    font-weight: 700;
}

/* Quiz List View */
.quiz-list-section {
    margin-bottom: 60px;
}

.section-header {
    display: flex;
    align-items: center;
    justify-content: space-between;
    margin-bottom: 24px;
}

.btn-back {
    padding: 8px 16px;
    border-radius: 8px;
    background-color: var(--card-bg);
    border: 1px solid var(--border-color);
    color: var(--text-secondary);
    font-size: 0.9rem;
    font-weight: 600;
    transition: var(--transition);
}

.btn-back:hover {
    background-color: var(--card-bg-hover);
    color: var(--text-primary);
}

.quiz-list-grid {
    display: grid;
    grid-template-columns: repeat(auto-fill, minmax(320px, 1fr));
    gap: 20px;
}

.quiz-card {
    background-color: var(--card-bg);
    border: 1px solid var(--border-color);
    border-radius: var(--radius-md);
    padding: 24px;
    transition: var(--transition);
    display: flex;
    flex-direction: column;
    justify-content: space-between;
}

.quiz-card:hover {
    border-color: var(--primary);
    transform: translateY(-2px);
}

.quiz-title {
    font-size: 1.2rem;
    font-weight: 700;
    margin-bottom: 8px;
}

.quiz-desc {
    color: var(--text-secondary);
    font-size: 0.85rem;
    margin-bottom: 20px;
}

.quiz-meta {
    display: flex;
    align-items: center;
    justify-content: space-between;
    margin-bottom: 20px;
}

.meta-item {
    font-size: 0.8rem;
    color: var(--text-secondary);
    display: flex;
    align-items: center;
    gap: 6px;
}

.btn-start {
    width: 100%;
    padding: 12px;
    border-radius: var(--radius-sm);
    background-color: var(--primary);
    color: #fff;
    font-weight: 700;
    font-size: 0.95rem;
    text-align: center;
    transition: var(--transition);
}

.btn-start:hover {
    background-color: var(--primary-hover);
    box-shadow: 0 4px 12px rgba(var(--primary-rgb), 0.25);
}

/* Modal Overlay for Mode Selection */
.modal-overlay {
    position: fixed;
    top: 0;
    left: 0;
    width: 100%;
    height: 100%;
    background-color: rgba(0, 0, 0, 0.6);
    backdrop-filter: blur(4px);
    z-index: 2000;
    display: flex;
    align-items: center;
    justify-content: center;
    opacity: 0;
    pointer-events: none;
    transition: var(--transition);
}

.modal-overlay.active {
    opacity: 1;
    pointer-events: auto;
}

.modal-content {
    background-color: var(--bg-main);
    border: 1px solid var(--border-color);
    border-radius: var(--radius-lg);
    width: 90%;
    max-width: 500px;
    padding: 32px;
    position: relative;
    transform: translateY(20px);
    transition: var(--transition);
}

.modal-overlay.active .modal-content {
    transform: translateY(0);
}

.btn-close-modal {
    position: absolute;
    top: 16px;
    right: 16px;
    font-size: 1.5rem;
    color: var(--text-secondary);
    transition: var(--transition);
}

.btn-close-modal:hover {
    color: var(--text-primary);
}

.modal-title {
    font-size: 1.5rem;
    text-align: center;
    margin-bottom: 24px;
}

.mode-cards {
    display: flex;
    flex-direction: column;
    gap: 16px;
}

.mode-card {
    background-color: var(--card-bg);
    border: 1.5px solid var(--border-color);
    border-radius: var(--radius-md);
    padding: 20px;
    cursor: pointer;
    transition: var(--transition);
    position: relative;
}

.mode-card:hover {
    border-color: var(--primary);
    background-color: var(--card-bg-hover);
}

.mode-card-header {
    display: flex;
    align-items: center;
    gap: 12px;
    margin-bottom: 6px;
}

.mode-icon {
    font-size: 1.4rem;
}

.mode-name {
    font-weight: 700;
    font-size: 1.1rem;
}

.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;
}

.mode-desc {
    font-size: 0.85rem;
    color: var(--text-secondary);
    line-height: 1.5;
}

/* Quiz Playing UI */
.quiz-play-container {
    max-width: 800px;
    margin: 30px auto;
}

.quiz-header {
    display: flex;
    align-items: center;
    justify-content: space-between;
    margin-bottom: 24px;
}

.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));
}

.quiz-timer-box {
    display: flex;
    align-items: center;
    gap: 8px;
    padding: 8px 16px;
    border-radius: 30px;
    background-color: var(--card-bg);
    border: 1px solid var(--border-color);
    font-weight: 700;
    color: var(--danger);
}

.quiz-timer-box.solution-mode-timer {
    color: var(--text-primary);
}

.quiz-card-main {
    background-color: var(--card-bg);
    border: 1px solid var(--border-color);
    border-radius: var(--radius-lg);
    padding: 32px;
    margin-bottom: 24px;
    flex-shrink: 0;
}

.progress-section {
    display: flex;
    align-items: center;
    justify-content: space-between;
    margin-bottom: 24px;
    font-size: 0.85rem;
    color: var(--text-secondary);
}

.progress-bar-container {
    flex: 1;
    height: 6px;
    background-color: var(--border-color);
    border-radius: 4px;
    margin: 0 16px;
    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;
}

.question-num {
    font-size: 0.8rem;
    font-weight: 700;
    text-transform: uppercase;
    letter-spacing: 0.05em;
    color: var(--primary);
    margin-bottom: 8px;
}

.question-text {
    font-size: 1.25rem;
    line-height: 1.6;
    margin-bottom: 24px;
}

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

.option-item {
    padding: 16px 20px;
    border-radius: var(--radius-md);
    background-color: var(--bg-main);
    border: 1.5px solid var(--border-color);
    display: flex;
    align-items: center;
    gap: 16px;
    font-weight: 500;
    font-size: 1rem;
    transition: var(--transition);
}

.option-item:hover {
    border-color: var(--primary);
    background-color: var(--card-bg-hover);
}

.option-prefix {
    width: 28px;
    height: 28px;
    border-radius: 50%;
    background-color: var(--card-bg);
    border: 1px solid var(--border-color);
    display: flex;
    align-items: center;
    justify-content: center;
    font-weight: 700;
    font-size: 0.85rem;
    color: var(--text-secondary);
    transition: var(--transition);
}

/* Option States */
.option-item.correct {
    border-color: var(--success);
    background-color: var(--success-bg);
}
.option-item.correct .option-prefix {
    background-color: var(--success);
    border-color: var(--success);
    color: #fff;
}

.option-item.wrong {
    border-color: var(--danger);
    background-color: var(--danger-bg);
}
.option-item.wrong .option-prefix {
    background-color: var(--danger);
    border-color: var(--danger);
    color: #fff;
}

.option-item.selected-practice {
    border-color: var(--primary);
    background-color: rgba(var(--primary-rgb), 0.1);
}
.option-item.selected-practice .option-prefix {
    background-color: var(--primary);
    border-color: var(--primary);
    color: #fff;
}

/* Explanation / Practice Mode Info Boxes */
.explanation-box {
    margin-top: 24px;
    padding: 20px;
    border-radius: var(--radius-md);
    background-color: rgba(16, 185, 129, 0.08);
    border: 1px solid rgba(16, 185, 129, 0.25);
    font-size: 0.95rem;
    line-height: 1.5;
}

.explanation-box.practice-note-mode {
    background-color: rgba(59, 130, 246, 0.08);
    border-color: rgba(59, 130, 246, 0.25);
    color: var(--text-primary);
}

.exp-title {
    display: flex;
    align-items: center;
    gap: 8px;
    font-weight: 700;
    color: var(--success);
    margin-bottom: 8px;
}

/* Bottom Controls */
.quiz-controls {
    display: flex;
    align-items: center;
    justify-content: space-between;
    flex-shrink: 0;
    margin-top: 20px;
    padding-bottom: 10px;
}

.btn-control {
    display: inline-flex;
    align-items: center;
    gap: 8px;
    padding: 12px 24px;
    border-radius: var(--radius-sm);
    font-weight: 700;
    font-size: 0.95rem;
    background-color: var(--card-bg);
    border: 1px solid var(--border-color);
    color: var(--text-primary);
    transition: var(--transition);
}

.btn-control:hover {
    background-color: var(--card-bg-hover);
}

.btn-control.next {
    background-color: var(--primary);
    border-color: var(--primary);
    color: #fff;
}
.btn-control.next:hover {
    background-color: var(--primary-hover);
}

/* Question Palette Layout */
.quiz-palette-card {
    background-color: var(--card-bg);
    border: 1px solid var(--border-color);
    border-radius: var(--radius-lg);
    padding: 24px;
    margin-bottom: 30px;
}

.palette-title {
    font-size: 1rem;
    font-weight: 700;
    margin-bottom: 16px;
    color: var(--text-secondary);
}

.palette-grid {
    display: flex;
    flex-wrap: wrap;
    gap: 10px;
}

.palette-btn {
    width: 36px;
    height: 36px;
    border-radius: 8px;
    display: flex;
    align-items: center;
    justify-content: center;
    font-size: 0.85rem;
    font-weight: 700;
    border: 1.5px solid var(--border-color);
    transition: var(--transition);
}

.palette-btn.unattempted {
    background-color: var(--bg-main);
    color: var(--text-secondary);
}

.palette-btn.attempted {
    background-color: rgba(var(--primary-rgb), 0.15);
    border-color: var(--primary);
    color: var(--primary);
}

.palette-btn.active {
    background-color: var(--primary);
    border-color: var(--primary);
    color: #fff;
    box-shadow: 0 4px 10px rgba(var(--primary-rgb), 0.3);
}

/* Practice mode: palette shows answered but not correct/wrong */
.palette-btn.practice-correct, .palette-btn.practice-wrong {
    background-color: rgba(var(--primary-rgb), 0.15);
    border-color: var(--primary);
    color: var(--primary);
}

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

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

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

/* Results Screen */
.results-container {
    max-width: 1200px;
    margin: 10px auto 40px auto;
    text-align: center;
    padding: 0 24px;
    width: 100%;
}

/* 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);
}

/* Results view */
.result-container {
    max-width: 500px;
    margin: 40px auto;
    text-align: center;
    padding: 40px;
    border-radius: var(--radius-lg);
}

.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: 160px;
    height: 160px;
    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: 10px; /* ring thickness */
}

.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: 2.2rem;
    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);
}

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

/* =============================================
   QUIZ REVIEW SECTION
   ============================================= */
.review-header {
    padding: 10px 40px 20px;
    border-bottom: 1px solid var(--border-color);
    display: flex;
    flex-direction: column;
    gap: 8px;
    text-align: left;
}

.review-header .btn-back {
    background: transparent !important;
    border: none !important;
    color: var(--primary) !important;
    font-weight: 600 !important;
    cursor: pointer !important;
    font-size: 1rem !important;
    margin-bottom: 16px !important;
    padding: 0 !important;
    transition: var(--transition) !important;
    align-self: flex-start !important;
    box-shadow: none !important;
    transform: none !important;
}

.review-header .btn-back:hover {
    color: var(--primary-hover) !important;
    transform: translateX(-4px) !important;
    background: transparent !important;
}

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

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

/* Review Answers List */
.review-answers-title {
    font-size: 1.5rem;
    margin-top: 40px;
    margin-bottom: 24px;
    text-align: left;
}

.review-card {
    background-color: var(--card-bg);
    border: 1.5px solid var(--border-color);
    border-radius: var(--radius-lg);
    padding: 24px;
    margin-bottom: 20px;
    text-align: left;
    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;
    margin-bottom: 16px;
}

.q-num {
    font-weight: 700;
    font-size: 0.85rem;
    color: var(--primary);
    text-transform: uppercase;
    letter-spacing: 0.05em;
}

.review-status-badge {
    font-size: 0.75rem;
    font-weight: 700;
    padding: 4px 10px;
    border-radius: 20px;
}

.correct-badge { background-color: var(--success-bg); color: var(--success); }
.wrong-badge { background-color: var(--danger-bg); color: var(--danger); }
.skipped-badge { background-color: rgba(245, 158, 11, 0.15); color: var(--warning); }

.review-question-text {
    font-size: 1.1rem;
    font-weight: 600;
    margin-bottom: 16px;
    line-height: 1.5;
}

.review-options {
    display: flex;
    flex-direction: column;
    gap: 8px;
    margin-bottom: 16px;
}

.review-option {
    padding: 12px 16px;
    border-radius: var(--radius-sm);
    background-color: var(--bg-main);
    border: 1px solid var(--border-color);
    display: flex;
    align-items: center;
    gap: 12px;
    font-size: 0.95rem;
}

.review-option-prefix {
    width: 24px;
    height: 24px;
    border-radius: 50%;
    background-color: var(--card-bg);
    border: 1px solid var(--border-color);
    display: flex;
    align-items: center;
    justify-content: center;
    font-size: 0.75rem;
    font-weight: 700;
}

.review-opt-correct {
    border-color: var(--success);
    background-color: var(--success-bg);
}
.review-opt-correct .review-option-prefix {
    background-color: var(--success);
    border-color: var(--success);
    color: #fff;
}

.review-opt-user-wrong {
    border-color: var(--danger);
    background-color: var(--danger-bg);
}
.review-opt-user-wrong .review-option-prefix {
    background-color: var(--danger);
    border-color: var(--danger);
    color: #fff;
}

.review-explanation {
    padding: 16px;
    border-radius: var(--radius-sm);
    background-color: rgba(16, 185, 129, 0.08);
    border: 1.5px solid rgba(16, 185, 129, 0.25);
    font-size: 0.9rem;
    line-height: 1.5;
}

.exp-label {
    display: block;
    font-weight: 700;
    color: var(--success);
    margin-bottom: 6px;
}

/* Footer Section */
.footer {
    border-top: 1px solid var(--border-color);
    background-color: var(--bg-main);
    margin-top: 80px;
}

.footer-inner {
    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-logo-link {
    text-decoration: none;
}

.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);
}

.footer-sub {
    font-size: 0.85rem;
    color: var(--text-secondary);
}

/* Status Indicator Header */
.status-pill {
    font-size: 0.75rem;
    font-weight: 700;
    padding: 4px 10px;
    border-radius: 20px;
    display: flex;
    align-items: center;
    gap: 6px;
    background-color: var(--card-bg);
    border: 1px solid var(--border-color);
}

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

.status-dot.online { background-color: var(--success); }
.status-dot.offline { background-color: var(--warning); }

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

body.quiz-mode-active .header,
body.quiz-mode-active .footer,
body.quiz-mode-active .ambient-bg {
    display: none !important;
}

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

.quiz-fullscreen-layout {
    display: none;
    flex-direction: column;
    height: 100vh !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 {
    margin: 0 !important;
    padding: 0 !important;
    line-height: 1.2 !important;
    font-size: 1.25rem !important; /* Elegant size */
}

.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(--primary);
}

.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: rgba(var(--primary-rgb), 0.15);
    border-color: var(--primary);
    color: var(--primary);
}

/* 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: rgba(var(--primary-rgb), 0.15);
    border-color: var(--primary);
}

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

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

.btn-sidebar-submit {
    display: block;
    width: 100%;
    padding: 14px 28px;
    font-weight: 700;
    font-size: 1rem;
    font-family: var(--font-heading);
    color: #FFFFFF;
    background-color: var(--primary);
    border: none;
    border-radius: var(--radius-sm);
    cursor: pointer;
    text-align: center;
    box-shadow: 0 4px 12px rgba(var(--primary-rgb), 0.25);
    transition: var(--transition);
}

.btn-sidebar-submit:hover {
    background-color: var(--primary-hover);
    transform: translateY(-2px);
    box-shadow: 0 6px 18px rgba(var(--primary-rgb), 0.35);
}

.btn-sidebar-submit:active {
    transform: translateY(0);
    box-shadow: 0 4px 10px rgba(var(--primary-rgb), 0.25);
}

/* Pause Overlay */
.pause-overlay {
    position: fixed;
    top: 0;
    left: 0;
    width: 100%;
    height: 100%;
    background-color: rgba(0, 0, 0, 0.85);
    backdrop-filter: blur(8px);
    z-index: 3000;
    display: flex;
    align-items: center;
    justify-content: center;
    opacity: 0;
    pointer-events: none;
    transition: var(--transition);
}

.pause-overlay.active {
    opacity: 1;
    pointer-events: auto;
}

.pause-content {
    background-color: var(--bg-main);
    border: 1px solid var(--border-color);
    border-radius: var(--radius-lg);
    padding: 40px;
    text-align: center;
    max-width: 400px;
    width: 90%;
    transform: translateY(20px);
    transition: var(--transition);
}

.pause-overlay.active .pause-content {
    transform: translateY(0);
}

/* Quiz header logo */
.quiz-header-logo {
    width: 36px;
    height: 36px;
    border-radius: 8px;
    object-fit: cover;
    flex-shrink: 0;
}

/* Quiz action buttons (pause / close) */
.btn-quiz-action {
    width: 40px;
    height: 40px;
    border-radius: 50%;
    border: 1px solid var(--border-color);
    background: var(--card-bg);
    color: var(--text-primary);
    font-size: 1rem;
    display: flex;
    align-items: center;
    justify-content: center;
    cursor: pointer;
    transition: var(--transition);
    flex-shrink: 0;
}

.btn-quiz-action:hover {
    background: var(--card-bg-hover);
    transform: scale(1.08);
}

.btn-quiz-action.danger {
    color: var(--danger);
    border-color: rgba(239,68,68,0.3);
}

.btn-quiz-action.danger:hover {
    background: var(--danger-bg);
}

/* Progress label */
.progress-label {
    font-size: 0.85rem;
    color: var(--text-secondary);
    white-space: nowrap;
    flex-shrink: 0;
}

/* Download Banner */
.download-banner {
    display: flex;
    align-items: center;
    gap: 48px;
    padding: 40px 48px;
    border-radius: var(--radius-lg);
    background: var(--card-bg);
    border: 1px solid var(--border-color);
    backdrop-filter: blur(8px);
    margin-top: 60px;
    overflow: hidden;
    position: relative;
}

.download-banner::before {
    content: '';
    position: absolute;
    top: 0; left: 0; right: 0; bottom: 0;
    background: linear-gradient(135deg, rgba(var(--primary-rgb),0.06) 0%, transparent 60%);
    pointer-events: none;
}

.download-content {
    flex: 1;
}

.download-badge {
    display: inline-flex;
    align-items: center;
    gap: 6px;
    font-size: 0.75rem;
    font-weight: 700;
    text-transform: uppercase;
    letter-spacing: 0.06em;
    color: var(--primary);
    background: rgba(var(--primary-rgb), 0.1);
    border: 1px solid rgba(var(--primary-rgb), 0.2);
    padding: 4px 12px;
    border-radius: 20px;
    margin-bottom: 12px;
}

.download-content h3 {
    font-size: 1.5rem;
    font-weight: 800;
    margin-bottom: 10px;
}

.download-content p {
    font-size: 0.9rem;
    color: var(--text-secondary);
    line-height: 1.6;
    margin-bottom: 24px;
    max-width: 400px;
}

.download-buttons {
    display: flex;
    gap: 16px;
    flex-wrap: wrap;
}

.btn-download {
    display: inline-flex;
    align-items: center;
    gap: 12px;
    padding: 12px 20px;
    background: var(--primary);
    color: #fff;
    border-radius: var(--radius-md);
    text-decoration: none;
    transition: var(--transition);
    font-weight: 600;
}

.btn-download:hover {
    background: var(--primary-hover);
    transform: translateY(-2px);
    box-shadow: 0 6px 20px rgba(var(--primary-rgb), 0.35);
}

.btn-download-icon {
    font-size: 1.4rem;
}

.btn-download small {
    display: block;
    font-size: 0.7rem;
    font-weight: 400;
    opacity: 0.85;
}

.btn-download strong {
    display: block;
    font-size: 0.95rem;
}

.download-visual {
    flex-shrink: 0;
}

.download-logo {
    width: 100px;
    height: 100px;
    border-radius: 20px;
    object-fit: cover;
    box-shadow: 0 12px 40px rgba(var(--primary-rgb), 0.25);
}

/* =============================================
   RESPONSIVE BREAKPOINTS
   ============================================= */

/* Tablet: ≤992px */
@media (max-width: 992px) {
    .quiz-fullscreen-body {
        flex-direction: column;
        overflow-y: auto;
    }

    .quiz-main-content {
        padding: 24px;
        overflow-y: visible;
        flex: none;
        height: auto;
    }

    .quiz-sidebar {
        width: 100%;
        border-left: none;
        border-top: 1px solid var(--border-color);
        padding: 24px;
        flex: none;
        overflow-y: visible;
    }

    .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 {
        flex-direction: column;
        text-align: center;
        padding: 32px 24px;
        gap: 24px;
    }

    .download-content p { max-width: 100%; }
    .download-buttons { justify-content: center; }
}

/* Mobile: ≤768px */
@media (max-width: 768px) {
    /* Nav */
    .nav-links {
        display: none;
        flex-direction: column;
        position: fixed;
        top: 70px;
        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;
    }

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

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

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

    .hamburger {
        display: flex;
    }

    .status-pill {
        display: none;
    }

    .brand-subtitle { display: none; }

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

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

    .hero-stats {
        gap: 16px;
        padding: 12px 20px;
    }

    .hero-stat strong { font-size: 1.1rem; }

    .section-header-row {
        flex-direction: column;
        align-items: flex-start;
    }

    .categories-tabs {
        width: 100%;
        justify-content: flex-start;
        flex-wrap: wrap;
        gap: 8px;
    }

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

    /* Cards grid */
    .items-grid {
        grid-template-columns: 1fr;
    }

    .quiz-list-grid {
        grid-template-columns: 1fr;
    }

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

    .result-actions {
        flex-direction: column;
    }

    /* Review */
    .review-header { padding: 20px; }
    .review-list { padding: 16px; gap: 16px; }

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

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

    .quiz-header-title-group h2 {
        font-size: 0.95rem !important;
    }

    .quiz-timer-box {
        padding: 5px 10px;
        font-size: 0.9rem;
    }

    /* Quiz main content */
    .quiz-main-content {
        padding: 16px;
    }

    .quiz-card-main {
        padding: 20px 16px;
    }

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

    .btn-control {
        padding: 10px 16px;
        font-size: 0.88rem;
    }

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

    .footer-inner {
        padding: 32px 16px 24px;
    }

    .section-header {
        flex-direction: column;
        align-items: flex-start;
        gap: 12px;
    }

    /* Modal */
    .modal-content {
        padding: 24px 20px;
    }
}

/* Small Mobile: ≤480px */
@media (max-width: 480px) {
    .hero-section h1 { font-size: 1.7rem; }
    .hero-stats { gap: 12px; padding: 10px 16px; }
    .hero-stat-divider { display: none; }
    .hero-stat { display: none; }
    .hero-stat:first-child { display: flex; }
    .results-card { padding: 24px 16px; }
    .footer-links-grid { grid-template-columns: 1fr; }
    .quiz-fullscreen-header { padding: 0 12px; height: 60px; }
    .quiz-sidebar { padding: 16px; }
}

/* =============================================
   COMPREHENSIVE MOBILE RESPONSIVENESS
   ============================================= */

/* ≤1100px — Large tablets / small laptops */
@media (max-width: 1100px) {
    .quiz-list-grid {
        grid-template-columns: repeat(2, 1fr);
    }
    .items-grid {
        grid-template-columns: repeat(2, 1fr);
    }
}

/* ≤992px — Tablet */
@media (max-width: 992px) {
    .main-content {
        padding-top: 80px;
    }

    /* Results two-column → single col */
    .result-page-layout-wide {
        grid-template-columns: 1fr !important;
    }

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

    /* Review header */
    .review-header {
        padding: 20px 24px;
    }
}

/* ≤768px — Mobile */
@media (max-width: 768px) {
    /* ---- NAV ---- */
    .main-content {
        padding-top: 74px;
    }

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

    /* ---- HERO ---- */
    .hero-section {
        padding: 24px 0 40px;
    }

    .hero-content {
        padding: 0 8px;
    }

    .hero-section h1 {
        font-size: 1.9rem;
        line-height: 1.25;
    }

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

    .hero-badge {
        font-size: 0.78rem;
    }

    .hero-stats {
        flex-wrap: wrap;
        gap: 12px;
        padding: 12px 16px;
    }

    .hero-stat-divider {
        display: none;
    }

    /* ---- SECTIONS ---- */
    .section-header-row {
        flex-direction: column;
        align-items: flex-start;
        gap: 12px;
    }

    .categories-tabs {
        width: 100%;
        flex-wrap: wrap;
        gap: 8px;
    }

    .tab-btn {
        padding: 8px 14px;
        font-size: 0.85rem;
    }

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

    .quiz-list-grid {
        grid-template-columns: 1fr;
    }

    /* ---- QUIZ CARD (in quiz fullscreen) ---- */
    .quiz-card-main {
        padding: 20px 16px;
    }

    .question-text {
        font-size: 1rem;
        line-height: 1.55;
    }

    .option-btn {
        padding: 12px 14px;
        font-size: 0.95rem;
    }

    .btn-control {
        padding: 10px 16px;
        font-size: 0.88rem;
    }

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

    /* ---- RESULTS ---- */
    .results-container {
        padding: 0 16px;
        margin: 8px auto 32px;
    }

    .result-container {
        padding: 28px 20px;
    }

    .result-stats-grid {
        grid-template-columns: repeat(3, 1fr);
        gap: 8px;
    }

    .result-stat-item .val {
        font-size: 1.1rem;
    }

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

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

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

    .review-header h2 {
        font-size: 1.3rem;
    }

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

    .review-card {
        padding: 18px 16px;
    }

    .review-options {
        gap: 6px;
    }

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

    /* ---- QUIZ FULLSCREEN HEADER ---- */
    .quiz-fullscreen-header {
        padding: 0 14px;
        height: 62px;
    }

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

    .quiz-header-title-group h2 {
        font-size: 0.9rem !important;
        max-width: 140px;
        overflow: hidden;
        text-overflow: ellipsis;
        white-space: nowrap;
    }

    .quiz-timer-box {
        padding: 5px 10px;
        font-size: 0.88rem;
    }

    .quiz-main-content {
        padding: 16px;
    }

    /* ---- DOWNLOAD BANNER ---- */
    .download-banner {
        flex-direction: column;
        text-align: center;
        padding: 28px 20px;
        gap: 20px;
        border-radius: 16px;
    }

    .download-content p {
        max-width: 100%;
    }

    .download-buttons {
        justify-content: center;
    }

    /* ---- 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;
    }

    /* ---- MODAL ---- */
    .modal-content {
        padding: 24px 18px;
        margin: 16px;
    }

    /* ---- SECTION HEADER ---- */
    .section-header {
        flex-direction: column;
        align-items: flex-start;
        gap: 10px;
    }
}

/* ≤480px — Small Mobile */
@media (max-width: 480px) {
    .hero-section h1 {
        font-size: 1.6rem;
    }

    .hero-badge {
        font-size: 0.72rem;
        padding: 6px 12px;
    }

    .hero-stats {
        gap: 8px;
        padding: 10px 12px;
    }

    .hero-stat strong {
        font-size: 1rem;
    }

    .quiz-card-main {
        padding: 16px 12px;
    }

    .question-text {
        font-size: 0.95rem;
    }

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

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

    .result-stats-grid {
        gap: 6px;
    }

    .result-stat-item .val {
        font-size: 1rem;
    }

    .result-stat-item .lbl {
        font-size: 0.7rem;
    }

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

    .results-card {
        padding: 20px 14px;
    }

    .quiz-fullscreen-header {
        padding: 0 12px;
        height: 58px;
    }

    .quiz-sidebar {
        padding: 14px;
    }

    .quiz-header-title-group h2 {
        display: none !important;
    }

    .quiz-controls {
        justify-content: space-between;
    }

    .btn-control {
        flex: 1;
        font-size: 0.82rem;
        padding: 10px 8px;
        text-align: center;
    }
}