/* Premium Driving Manual Study Document Styling - Vanilla CSS */
@import url('https://fonts.googleapis.com/css2?family=Outfit:wght@300;400;500;600;700;800&display=swap');

:root {
    /* Color Palette - Dark Mode Default */
    --bg-primary: #0b0f19;
    --bg-secondary: #131a26;
    --bg-tertiary: #1e293b;
    --text-primary: #f8fafc;
    --text-secondary: #94a3b8;
    
    --accent: #3b82f6;
    --accent-glow: rgba(59, 130, 246, 0.15);
    --accent-hover: #2563eb;
    
    --success: #10b981;
    --success-glow: rgba(16, 185, 129, 0.1);
    
    --warning: #f59e0b;
    --warning-glow: rgba(245, 158, 11, 0.1);
    
    --danger: #ef4444;
    --danger-glow: rgba(239, 68, 68, 0.1);
    
    --glass-bg: rgba(19, 26, 38, 0.8);
    --glass-border: rgba(255, 255, 255, 0.08);
    --shadow: 0 12px 40px -12px rgba(0, 0, 0, 0.6);
    --font-sans: 'Outfit', -apple-system, BlinkMacSystemFont, "Segoe UI", Roboto, sans-serif;
    --transition: all 0.3s cubic-bezier(0.4, 0, 0.2, 1);
    --border-radius: 16px;
}

[data-theme="light"] {
    /* Color Palette - Light Mode Override */
    --bg-primary: #f8fafc;
    --bg-secondary: #ffffff;
    --bg-tertiary: #f1f5f9;
    --text-primary: #0f172a;
    --text-secondary: #64748b;
    
    --accent: #2563eb;
    --accent-glow: rgba(37, 99, 235, 0.1);
    --accent-hover: #1d4ed8;
    
    --success: #059669;
    --success-glow: rgba(5, 150, 105, 0.08);
    
    --warning: #d97706;
    --warning-glow: rgba(217, 119, 6, 0.08);
    
    --danger: #dc2626;
    --danger-glow: rgba(220, 38, 38, 0.08);
    
    --glass-bg: rgba(255, 255, 255, 0.85);
    --glass-border: rgba(15, 23, 42, 0.08);
    --shadow: 0 12px 35px -12px rgba(100, 116, 139, 0.12);
}

* {
    margin: 0;
    padding: 0;
    box-sizing: border-box;
    scroll-behavior: smooth;
}

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

/* Reading Progress Bar */
.scroll-progress-container {
    position: fixed;
    top: 0;
    left: 0;
    width: 100%;
    height: 4px;
    background: transparent;
    z-index: 1000;
}

.scroll-progress-bar {
    height: 100%;
    width: 0%;
    background: linear-gradient(90deg, var(--accent), var(--success), var(--warning));
    transition: width 0.1s ease-out;
}

/* Header & Controls */
header {
    background: var(--glass-bg);
    border-bottom: 1px solid var(--glass-border);
    position: sticky;
    top: 0;
    z-index: 900;
    backdrop-filter: blur(16px);
    -webkit-backdrop-filter: blur(16px);
    transition: var(--transition);
}

.header-container {
    max-width: 1400px;
    margin: 0 auto;
    padding: 0.85rem 2rem;
    display: flex;
    justify-content: space-between;
    align-items: center;
    gap: 1.5rem;
}

.logo-section {
    display: flex;
    align-items: center;
    gap: 0.75rem;
}

.logo-badge {
    background: linear-gradient(135deg, var(--accent), var(--success));
    color: white;
    width: 42px;
    height: 42px;
    border-radius: 12px;
    display: flex;
    justify-content: center;
    align-items: center;
    font-weight: 800;
    font-size: 1.2rem;
    box-shadow: 0 4px 14px rgba(59, 130, 246, 0.35);
}

.logo-text h1 {
    font-size: 1.2rem;
    font-weight: 700;
    letter-spacing: -0.025em;
    color: var(--text-primary);
}

.logo-text p {
    font-size: 0.75rem;
    color: var(--text-secondary);
    font-weight: 500;
}

.nav-controls {
    display: flex;
    align-items: center;
    gap: 1rem;
}

/* Search Box */
.search-box {
    position: relative;
    display: flex;
    align-items: center;
    background: var(--bg-tertiary);
    border: 1px solid var(--glass-border);
    border-radius: 20px;
    padding: 0.4rem 0.85rem;
    width: 320px;
    transition: var(--transition);
}

.search-box:focus-within {
    border-color: var(--accent);
    box-shadow: 0 0 10px var(--accent-glow);
}

.search-icon {
    font-size: 0.9rem;
    color: var(--text-secondary);
    margin-right: 0.5rem;
}

.search-box input {
    background: transparent;
    border: none;
    outline: none;
    color: var(--text-primary);
    font-family: var(--font-sans);
    font-size: 0.85rem;
    width: 100%;
}

.search-box input::placeholder {
    color: var(--text-secondary);
    opacity: 0.7;
}

#search-clear {
    background: transparent;
    border: none;
    color: var(--text-secondary);
    cursor: pointer;
    font-size: 0.8rem;
    padding: 0 0.2rem;
}

#search-clear:hover {
    color: var(--text-primary);
}

/* PDF Button */
.pdf-btn {
    background: var(--bg-tertiary);
    border: 1px solid var(--glass-border);
    color: var(--text-primary);
    padding: 0.45rem 1rem;
    font-size: 0.85rem;
    font-weight: 600;
    border-radius: 20px;
    text-decoration: none;
    display: flex;
    align-items: center;
    gap: 0.4rem;
    transition: var(--transition);
}

.pdf-btn:hover {
    background: var(--glass-border);
    transform: translateY(-1px);
}

/* Theme Toggle Button */
.theme-toggle-btn {
    background: var(--bg-tertiary);
    border: 1px solid var(--glass-border);
    color: var(--text-primary);
    width: 38px;
    height: 38px;
    border-radius: 50%;
    cursor: pointer;
    display: flex;
    justify-content: center;
    align-items: center;
    font-size: 1.05rem;
    transition: var(--transition);
}

.theme-toggle-btn:hover {
    transform: scale(1.05);
    background: var(--glass-border);
}

/* Layout Grid */
.app-layout {
    max-width: 1400px;
    margin: 0 auto;
    display: grid;
    grid-template-columns: 320px 1fr;
    gap: 2rem;
    padding: 2rem;
}

/* Sidebar Navigation (TOC) */
.toc-sidebar {
    position: relative;
}

.sidebar-sticky {
    position: sticky;
    top: 90px;
    max-height: calc(100vh - 120px);
    overflow-y: auto;
    background: var(--bg-secondary);
    border: 1px solid var(--glass-border);
    border-radius: var(--border-radius);
    padding: 1.5rem;
    box-shadow: var(--shadow);
    display: flex;
    flex-direction: column;
    gap: 1.5rem;
}

.sidebar-header h3 {
    font-size: 1.1rem;
    font-weight: 700;
    margin-bottom: 0.75rem;
    color: var(--text-primary);
}

/* Study progress indicator */
.study-progress-wrapper {
    font-size: 0.85rem;
    color: var(--text-secondary);
}

.study-progress-wrapper strong {
    color: var(--accent);
}

.mini-progress-bar {
    width: 100%;
    height: 6px;
    background: var(--bg-tertiary);
    border-radius: 3px;
    margin-top: 0.4rem;
    overflow: hidden;
}

.mini-progress-fill {
    height: 100%;
    width: 0%;
    background: linear-gradient(90deg, var(--accent), var(--success));
    transition: width 0.4s cubic-bezier(0.4, 0, 0.2, 1);
}

.toc-links {
    display: flex;
    flex-direction: column;
    gap: 0.35rem;
}

.toc-link {
    display: block;
    color: var(--text-secondary);
    padding: 0.6rem 0.85rem;
    font-size: 0.9rem;
    font-weight: 500;
    text-decoration: none;
    border-radius: 10px;
    transition: var(--transition);
    white-space: nowrap;
    overflow: hidden;
    text-overflow: ellipsis;
}

.toc-link:hover {
    color: var(--text-primary);
    background: var(--bg-tertiary);
    padding-left: 1.15rem;
}

.toc-link.active {
    color: white;
    background: var(--accent);
    box-shadow: 0 4px 12px rgba(59, 130, 246, 0.3);
    font-weight: 600;
}

.toc-link.quiz-highlight {
    border: 1px dashed var(--accent);
    margin-top: 0.5rem;
    font-weight: 600;
}

.toc-link.quiz-highlight.active {
    border-style: solid;
}

/* Main Content Area */
.document-content {
    display: flex;
    flex-direction: column;
    gap: 3rem;
}

.doc-section {
    background: var(--bg-secondary);
    border: 1px solid var(--glass-border);
    border-radius: var(--border-radius);
    padding: 2.5rem;
    box-shadow: var(--shadow);
    transition: var(--transition);
}

/* Search highlighting styling */
mark.highlight {
    background: rgba(245, 158, 11, 0.35);
    color: var(--text-primary);
    border-radius: 4px;
    padding: 0 2px;
}

/* Hero Intro Section */
.hero-section {
    position: relative;
    overflow: hidden;
    background: linear-gradient(135deg, var(--bg-secondary), #151e33);
    border: 1px solid var(--glass-border);
}

.hero-overlay {
    position: absolute;
    top: 0;
    left: 0;
    width: 100%;
    height: 100%;
    background: radial-gradient(circle at top right, rgba(59, 130, 246, 0.15), transparent 60%);
    pointer-events: none;
}

.hero-body {
    position: relative;
    z-index: 2;
}

.hero-tag {
    display: inline-block;
    background: var(--accent-glow);
    color: var(--accent);
    font-size: 0.75rem;
    font-weight: 700;
    padding: 0.3rem 0.85rem;
    border-radius: 20px;
    text-transform: uppercase;
    letter-spacing: 0.05em;
    margin-bottom: 1rem;
}

.hero-body h2 {
    font-size: 2.2rem;
    font-weight: 800;
    letter-spacing: -0.03em;
    line-height: 1.2;
    margin-bottom: 1rem;
    background: linear-gradient(to right, #ffffff, #94a3b8);
    -webkit-background-clip: text;
    -webkit-text-fill-color: transparent;
}

[data-theme="light"] .hero-body h2 {
    background: linear-gradient(to right, #0f172a, #475569);
    -webkit-background-clip: text;
    -webkit-text-fill-color: transparent;
}

.hero-body p {
    font-size: 1.05rem;
    color: var(--text-secondary);
    max-width: 800px;
    margin-bottom: 2rem;
}

/* Exam stats grid */
.exam-info-grid {
    display: grid;
    grid-template-columns: repeat(4, 1fr);
    gap: 1rem;
    margin-bottom: 2rem;
}

.info-card {
    background: var(--bg-tertiary);
    border: 1px solid var(--glass-border);
    border-radius: 12px;
    padding: 1.25rem 1rem;
    text-align: center;
    display: flex;
    flex-direction: column;
    justify-content: center;
    align-items: center;
    transition: var(--transition);
}

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

.info-num {
    font-size: 2rem;
    font-weight: 800;
    color: var(--accent);
    line-height: 1.1;
    margin-bottom: 0.25rem;
}

.info-lbl {
    font-size: 0.75rem;
    color: var(--text-secondary);
    font-weight: 600;
    text-transform: uppercase;
    letter-spacing: 0.05em;
}

.info-card.warning .info-num {
    color: var(--warning);
}
.info-card.success .info-num {
    color: var(--success);
}

/* Checklist Panel */
.study-checklist-panel {
    padding: 1.5rem 2.5rem;
}

.checklist-header {
    display: flex;
    justify-content: space-between;
    align-items: center;
    cursor: pointer;
}

.checklist-header h3 {
    font-size: 1.25rem;
    font-weight: 700;
}

.checklist-header p {
    font-size: 0.85rem;
    color: var(--text-secondary);
}

.checklist-arrow {
    font-size: 0.8rem;
    transition: var(--transition);
}

.checklist-body {
    margin-top: 1.5rem;
    border-top: 1px solid var(--glass-border);
    padding-top: 1.5rem;
    display: none;
    animation: slideDown 0.3s ease-out;
}

@keyframes slideDown {
    from { opacity: 0; transform: translateY(-5px); }
    to { opacity: 1; transform: translateY(0); }
}

.checklist-desc {
    font-size: 0.9rem;
    color: var(--text-secondary);
    margin-bottom: 1.25rem;
}

.checklist-grid {
    display: grid;
    grid-template-columns: repeat(auto-fill, minmax(280px, 1fr));
    gap: 0.85rem;
}

.check-item {
    display: flex;
    align-items: flex-start;
    gap: 0.75rem;
    font-size: 0.85rem;
    color: var(--text-primary);
    cursor: pointer;
    padding: 0.5rem;
    border-radius: 8px;
    background: var(--bg-tertiary);
    border: 1px solid var(--glass-border);
    transition: var(--transition);
}

.check-item:hover {
    border-color: var(--accent);
    background: var(--accent-glow);
}

.check-item input[type="checkbox"] {
    margin-top: 0.2rem;
    accent-color: var(--success);
    cursor: pointer;
}

.check-item input[type="checkbox"]:checked + span {
    text-decoration: line-through;
    color: var(--text-secondary);
}

/* Chapters layout */
.study-chapter {
    position: relative;
}

.chapter-badge {
    position: absolute;
    top: 2.5rem;
    right: 2.5rem;
    background: var(--bg-tertiary);
    border: 1px solid var(--glass-border);
    color: var(--text-secondary);
    font-size: 0.75rem;
    font-weight: 700;
    padding: 0.25rem 0.75rem;
    border-radius: 12px;
    text-transform: uppercase;
    letter-spacing: 0.05em;
}

.study-chapter h2 {
    font-size: 1.85rem;
    font-weight: 800;
    letter-spacing: -0.025em;
    margin-bottom: 1.75rem;
    color: var(--text-primary);
}

.content-block {
    display: flex;
    flex-direction: column;
    gap: 1.5rem;
}

.sub-section {
    border-top: 1px solid var(--glass-border);
    padding-top: 1.25rem;
    margin-top: 0.5rem;
}

.sub-section h4 {
    font-size: 1.1rem;
    font-weight: 700;
    margin-bottom: 0.75rem;
    color: var(--text-primary);
}

.two-column {
    display: grid;
    grid-template-columns: repeat(auto-fit, minmax(280px, 1fr));
    gap: 1.5rem;
}

.column h4 {
    font-size: 1.05rem;
    font-weight: 700;
    margin-bottom: 0.75rem;
    color: var(--text-primary);
}

.column ul, .content-block ul, .content-block ol {
    padding-left: 1.25rem;
}

.column li, .content-block li {
    margin-bottom: 0.5rem;
    font-size: 0.95rem;
    color: var(--text-secondary);
}

.column li strong, .content-block li strong {
    color: var(--text-primary);
}

/* Stats Bubble row */
.stats-highlight-row {
    display: flex;
    justify-content: space-around;
    gap: 1.5rem;
    background: var(--bg-tertiary);
    border: 1px solid var(--glass-border);
    border-radius: 16px;
    padding: 1.5rem;
    margin: 0.5rem 0;
}

.stat-bubble {
    text-align: center;
    flex: 1;
}

.stat-bubble .num {
    display: block;
    font-size: 2.25rem;
    font-weight: 800;
    color: var(--accent);
    line-height: 1.1;
    margin-bottom: 0.25rem;
}

.stat-bubble .label {
    font-size: 0.8rem;
    color: var(--text-secondary);
    font-weight: 500;
}

/* Alert Boxes & Callouts */
.alert-box {
    border-radius: var(--border-radius);
    padding: 1.5rem 1.75rem;
    display: flex;
    gap: 1rem;
    border: 1px solid var(--glass-border);
}

.alert-box.critical {
    background: var(--danger-glow);
    border-color: var(--danger);
}

.alert-box.critical h4 {
    color: var(--danger);
    font-size: 1.05rem;
    font-weight: 700;
    margin-bottom: 0.5rem;
}

.alert-box.critical p, .alert-box.critical li {
    color: var(--text-primary);
    font-size: 0.9rem;
}

.alert-box.double-score {
    position: relative;
    background: var(--warning-glow);
    border: 2px solid var(--warning);
    display: block;
    overflow: hidden;
}

.alert-badge {
    position: absolute;
    top: 0;
    right: 0;
    background: linear-gradient(135deg, var(--warning), var(--danger));
    color: white;
    font-size: 0.65rem;
    font-weight: 800;
    text-transform: uppercase;
    letter-spacing: 0.05em;
    padding: 0.35rem 0.85rem;
    border-radius: 0 0 0 12px;
}

.alert-box.double-score h4 {
    color: var(--warning);
    font-size: 1.1rem;
    font-weight: 700;
    margin-bottom: 0.75rem;
}

.alert-box.double-score p, .alert-box.double-score li {
    font-size: 0.95rem;
    color: var(--text-primary);
}

.alert-content ul {
    margin-top: 0.5rem;
    padding-left: 1.25rem;
}

/* Mini Cards Inside Sections */
.info-cards-strip {
    display: grid;
    grid-template-columns: repeat(auto-fit, minmax(220px, 1fr));
    gap: 1rem;
}

.mini-card {
    background: var(--bg-tertiary);
    border: 1px solid var(--glass-border);
    border-radius: 12px;
    padding: 1.25rem;
    transition: var(--transition);
}

.mini-card:hover {
    border-color: var(--accent);
}

.mini-card h4 {
    font-size: 1rem;
    font-weight: 700;
    margin-bottom: 0.5rem;
    color: var(--text-primary);
}

.mini-card p {
    font-size: 0.85rem;
    color: var(--text-secondary);
}

/* Exam tips */
.test-tip {
    background: var(--accent-glow);
    border-left: 4px solid var(--accent);
    padding: 1rem 1.25rem;
    border-radius: 0 12px 12px 0;
    font-size: 0.95rem;
    color: var(--text-primary);
}

/* Tables style */
.data-table {
    width: 100%;
    border-collapse: collapse;
    margin-top: 0.75rem;
    font-size: 0.85rem;
}

.data-table th, .data-table td {
    padding: 0.75rem 1rem;
    text-align: left;
    border-bottom: 1px solid var(--glass-border);
}

.data-table th {
    color: var(--text-secondary);
    font-weight: 600;
    background: var(--bg-tertiary);
}

.highlight-row-yellow td {
    background: rgba(245, 158, 11, 0.05);
}

.highlight-row-red td {
    background: rgba(239, 68, 68, 0.05);
}

/* Glossary style */
.glossary-list dt {
    font-weight: 700;
    color: var(--text-primary);
    margin-top: 1rem;
    font-size: 0.95rem;
}

.glossary-list dd {
    color: var(--text-secondary);
    font-size: 0.9rem;
    margin-left: 1rem;
    margin-bottom: 0.5rem;
}

/* EMEBDDED SIMULATOR WIDGET */
.embedded-widget-container {
    background: var(--bg-tertiary);
    border: 1px solid var(--glass-border);
    border-radius: var(--border-radius);
    padding: 1.5rem;
    margin: 1.5rem 0;
}

.widget-header h4 {
    font-size: 1.15rem;
    font-weight: 700;
    color: var(--text-primary);
}

.widget-header p {
    font-size: 0.85rem;
    color: var(--text-secondary);
    margin-bottom: 1rem;
}

.calculator-controls {
    margin-bottom: 1.5rem;
    border-bottom: 1px solid var(--glass-border);
    padding-bottom: 1rem;
}

.slider-wrapper {
    display: flex;
    flex-direction: column;
    gap: 0.5rem;
}

.slider-wrapper label {
    font-size: 0.9rem;
    font-weight: 600;
}

.slider-row {
    display: flex;
    align-items: center;
    gap: 1.5rem;
}

.slider-row input[type="range"] {
    flex-grow: 1;
    height: 8px;
    border-radius: 4px;
    outline: none;
    -webkit-appearance: none;
    background: var(--bg-secondary);
    cursor: pointer;
}

.slider-row input[type="range"]::-webkit-slider-thumb {
    -webkit-appearance: none;
    width: 22px;
    height: 22px;
    border-radius: 50%;
    background: var(--accent);
    cursor: pointer;
    box-shadow: 0 2px 6px rgba(0, 0, 0, 0.4);
    transition: var(--transition);
}

.slider-row input[type="range"]::-webkit-slider-thumb:hover {
    transform: scale(1.15);
}

.badge-display {
    background: var(--accent);
    color: white;
    font-weight: 800;
    font-size: 1.35rem;
    padding: 0.4rem 0.85rem;
    border-radius: 10px;
    min-width: 90px;
    text-align: center;
    box-shadow: 0 4px 10px rgba(59, 130, 246, 0.25);
}

.calculator-results {
    display: grid;
    grid-template-columns: 1fr 1fr;
    gap: 1.5rem;
}

@media (max-width: 900px) {
    .calculator-results {
        grid-template-columns: 1fr;
    }
}

.simulator-road-visual {
    display: flex;
    flex-direction: column;
    justify-content: space-between;
    gap: 1rem;
}

.road-simulation {
    background: #1e293b;
    border: 1px solid var(--glass-border);
    border-radius: 12px;
    height: 120px;
    position: relative;
    overflow: hidden;
    box-shadow: inset 0 0 15px rgba(0,0,0,0.5);
}

.sky {
    height: 40%;
    background: linear-gradient(to bottom, #111827, #1e293b);
}

.road {
    height: 60%;
    background: #334155;
    position: relative;
    display: flex;
    align-items: center;
}

.road-line {
    width: 100%;
    height: 2px;
    border-top: 2px dashed rgba(255, 255, 255, 0.25);
    position: absolute;
    top: 50%;
    transform: translateY(-50%);
}

.animated-car {
    font-size: 2.2rem;
    position: absolute;
    left: 20px;
    top: 10px;
    transform-origin: center;
    z-index: 10;
    transition: left 0.8s cubic-bezier(0.25, 0.8, 0.25, 1);
}

.hazard-object {
    font-size: 2rem;
    position: absolute;
    right: 25px;
    top: 12px;
    z-index: 5;
}

.brake-mark {
    position: absolute;
    height: 4px;
    background: #090d16;
    border-radius: 2px;
    top: 34px;
    opacity: 0.7;
    transition: left 0.8s cubic-bezier(0.25, 0.8, 0.25, 1), width 0.8s cubic-bezier(0.25, 0.8, 0.25, 1);
}

.action-btn {
    background: var(--accent);
    color: white;
    border: none;
    padding: 0.75rem 1.5rem;
    border-radius: 10px;
    font-family: var(--font-sans);
    font-weight: 600;
    font-size: 0.9rem;
    cursor: pointer;
    transition: var(--transition);
    text-align: center;
    width: 100%;
}

.action-btn:hover:not(:disabled) {
    background: var(--accent-hover);
    box-shadow: 0 4px 12px rgba(37, 99, 235, 0.3);
}

.action-btn:disabled {
    background: var(--text-secondary);
    opacity: 0.4;
    cursor: not-allowed;
}

/* WIDGET QUIZ SECTION */
.quiz-section {
    border: 2px solid var(--accent);
}

.quiz-container {
    background: var(--bg-tertiary);
    border: 1px solid var(--glass-border);
    border-radius: 16px;
    padding: 1.75rem;
    margin-top: 1.5rem;
}

.quiz-status-bar {
    margin-bottom: 1.5rem;
}

.quiz-progress-info {
    display: flex;
    justify-content: space-between;
    align-items: center;
    font-size: 0.85rem;
    font-weight: 600;
    margin-bottom: 0.5rem;
}

.points-badge {
    background: var(--accent-glow);
    color: var(--accent);
    padding: 0.2rem 0.6rem;
    border-radius: 12px;
}

.progress-bar-bg {
    width: 100%;
    height: 6px;
    background: var(--bg-secondary);
    border-radius: 3px;
    overflow: hidden;
}

.progress-bar-fill {
    height: 100%;
    background: linear-gradient(90deg, var(--accent), var(--success));
    width: 0%;
    transition: width 0.4s ease;
}

.question-container h3 {
    font-size: 1.25rem;
    font-weight: 700;
    line-height: 1.4;
    margin-bottom: 1.25rem;
}

.options-grid {
    display: flex;
    flex-direction: column;
    gap: 0.75rem;
    margin-bottom: 1.5rem;
}

.option-element {
    background: var(--bg-secondary);
    border: 1.5px solid var(--glass-border);
    border-radius: 12px;
    padding: 1rem 1.25rem;
    color: var(--text-primary);
    cursor: pointer;
    font-family: var(--font-sans);
    font-weight: 500;
    font-size: 0.95rem;
    text-align: left;
    transition: var(--transition);
    display: flex;
    align-items: center;
    gap: 0.85rem;
}

.option-element:hover:not(.disabled) {
    border-color: var(--accent);
    background: var(--accent-glow);
    transform: translateX(3px);
}

.opt-indicator {
    width: 26px;
    height: 26px;
    background: var(--bg-tertiary);
    border: 1px solid var(--glass-border);
    border-radius: 50%;
    display: flex;
    justify-content: center;
    align-items: center;
    font-weight: 700;
    font-size: 0.8rem;
    transition: var(--transition);
    flex-shrink: 0;
}

.option-element.selected {
    border-color: var(--accent);
    background: var(--accent-glow);
}

.option-element.selected .opt-indicator {
    background: var(--accent);
    color: white;
    border-color: var(--accent);
}

.option-element.correct {
    border-color: var(--success) !important;
    background: var(--success-glow) !important;
}

.option-element.correct .opt-indicator {
    background: var(--success) !important;
    color: white;
    border-color: var(--success) !important;
}

.option-element.incorrect {
    border-color: var(--danger) !important;
    background: var(--danger-glow) !important;
}

.option-element.incorrect .opt-indicator {
    background: var(--danger) !important;
    color: white;
    border-color: var(--danger) !important;
}

.explanation-box {
    background: rgba(245, 158, 11, 0.06);
    border-left: 4px solid var(--warning);
    border-radius: 0 12px 12px 0;
    padding: 1rem 1.25rem;
    margin-bottom: 1.5rem;
    animation: fadeIn 0.3s ease-out;
}

.explanation-box h5 {
    color: var(--warning);
    font-weight: 700;
    font-size: 0.9rem;
    margin-bottom: 0.2rem;
}

.explanation-box p {
    font-size: 0.85rem;
    color: var(--text-primary);
}

.quiz-actions {
    display: flex;
    justify-content: flex-end;
}

/* Quiz results styling */
.quiz-results {
    animation: fadeIn 0.5s ease-out;
    margin-top: 1.5rem;
}

.results-card {
    background: var(--bg-tertiary);
    border: 1px solid var(--glass-border);
    border-radius: 20px;
    padding: 2.5rem;
    text-align: center;
    box-shadow: var(--shadow);
}

.score-circle {
    width: 140px;
    height: 140px;
    border-radius: 50%;
    margin: 0 auto 1.5rem;
    display: flex;
    flex-direction: column;
    justify-content: center;
    align-items: center;
    background: linear-gradient(135deg, var(--bg-secondary), rgba(59, 130, 246, 0.08));
    border: 4px solid var(--accent);
    box-shadow: 0 8px 20px rgba(59, 130, 246, 0.2);
}

.score-number {
    font-size: 2.75rem;
    font-weight: 800;
    line-height: 1;
}

.score-total {
    font-size: 0.85rem;
    color: var(--text-secondary);
    margin-top: 0.2rem;
}

#results-title {
    font-size: 1.6rem;
    font-weight: 800;
    margin-bottom: 0.5rem;
}

.text-passed {
    color: var(--success);
}

.text-failed {
    color: var(--danger);
}

#results-summary {
    color: var(--text-secondary);
    font-size: 0.95rem;
    margin-bottom: 2rem;
    line-height: 1.5;
}

.results-buttons {
    display: flex;
    justify-content: center;
    gap: 1rem;
}

.secondary-btn {
    background: var(--bg-secondary);
    color: var(--text-primary);
    border: 1px solid var(--glass-border);
    padding: 0.75rem 1.5rem;
    border-radius: 10px;
    font-family: var(--font-sans);
    font-weight: 600;
    font-size: 0.9rem;
    cursor: pointer;
    transition: var(--transition);
}

.secondary-btn:hover {
    background: var(--glass-border);
}

/* Footer layout */
.doc-footer {
    border-top: 1px solid var(--glass-border);
    padding-top: 2rem;
    text-align: center;
    color: var(--text-secondary);
    font-size: 0.8rem;
    display: flex;
    flex-direction: column;
    gap: 0.5rem;
}

/* SCROLL ANIMATION AND MOBILE RESPONSIVENESS */
@keyframes fadeIn {
    from { opacity: 0; transform: translateY(10px); }
    to { opacity: 1; transform: translateY(0); }
}

@media (max-width: 1024px) {
    .app-layout {
        grid-template-columns: 1fr;
        padding: 1.25rem;
    }
    
    .toc-sidebar {
        display: none; /* Hide sticky sidebar on tablet/mobile */
    }
    
    .header-container {
        padding: 0.75rem 1.25rem;
    }
    
    .search-box {
        width: 200px;
    }
    
    .doc-section {
        padding: 1.75rem;
    }
    
    .exam-info-grid {
        grid-template-columns: repeat(2, 1fr);
    }
}

@media (max-width: 600px) {
    .search-box {
        display: none; /* Hide search completely on very small screens */
    }
    
    .hero-body h2 {
        font-size: 1.75rem;
    }
    
    .stats-highlight-row {
        flex-direction: column;
        gap: 1rem;
    }
    
    .results-buttons {
        flex-direction: column;
        width: 100%;
    }
    
    .results-buttons button {
        width: 100%;
    }
}

/* TRAFFIC SIGN QUIZ STYLING */
.toc-link.quiz-highlight.sign-quiz-highlight {
    border-color: var(--warning);
    color: var(--warning);
}

.toc-link.quiz-highlight.sign-quiz-highlight.active {
    background: var(--warning);
    color: white;
    box-shadow: 0 4px 12px var(--warning-glow);
}

.quiz-setup-grid {
    display: grid;
    grid-template-columns: repeat(auto-fit, minmax(240px, 1fr));
    gap: 1.5rem;
    margin-bottom: 2rem;
}

.setup-group {
    display: flex;
    flex-direction: column;
    gap: 0.5rem;
}

.setup-group label {
    font-size: 0.9rem;
    font-weight: 600;
    color: var(--text-primary);
}

.setup-select {
    background: var(--bg-secondary);
    border: 1.5px solid var(--glass-border);
    color: var(--text-primary);
    padding: 0.75rem 1rem;
    border-radius: 12px;
    font-family: var(--font-sans);
    font-size: 0.95rem;
    cursor: pointer;
    outline: none;
    transition: var(--transition);
}

.setup-select:focus {
    border-color: var(--warning);
    box-shadow: 0 0 10px var(--warning-glow);
}

.sign-quiz-image-container {
    background: #ffffff; /* High contrast white backdrop for official sign colors */
    border: 1.5px solid var(--glass-border);
    border-radius: var(--border-radius);
    padding: 1.5rem;
    display: flex;
    justify-content: center;
    align-items: center;
    max-width: 220px;
    height: 220px;
    margin: 0 auto 2rem;
    box-shadow: 0 8px 30px rgba(0, 0, 0, 0.15);
    transition: var(--transition);
}

.sign-quiz-image {
    max-width: 100%;
    max-height: 100%;
    object-fit: contain;
    animation: zoomIn 0.3s cubic-bezier(0.34, 1.56, 0.64, 1);
}

@keyframes zoomIn {
    from { transform: scale(0.8); opacity: 0; }
    to { transform: scale(1); opacity: 1; }
}

/* PREMIUM ENHANCEMENTS STYLING */

/* 1. Visual Sign Gallery Grid & Cards */
.sign-gallery-grid {
    display: grid;
    grid-template-columns: repeat(auto-fill, minmax(130px, 1fr));
    gap: 1.25rem;
    margin-top: 1.5rem;
    max-height: 500px;
    overflow-y: auto;
    padding: 0.5rem;
    border: 1px solid var(--glass-border);
    border-radius: var(--border-radius);
    background: var(--bg-secondary);
}

.gallery-card {
    background: var(--bg-tertiary);
    border: 1.5px solid var(--glass-border);
    border-radius: 12px;
    padding: 0.75rem;
    text-align: center;
    display: flex;
    flex-direction: column;
    align-items: center;
    gap: 0.5rem;
    transition: var(--transition);
}

.gallery-card:hover {
    transform: translateY(-2px);
    border-color: var(--warning);
    box-shadow: 0 4px 12px var(--warning-glow);
}

.gallery-card-img-container {
    background: #ffffff;
    padding: 0.5rem;
    border-radius: 8px;
    width: 80px;
    height: 80px;
    display: flex;
    justify-content: center;
    align-items: center;
    box-shadow: 0 2px 6px rgba(0,0,0,0.1);
}

.gallery-card-img-container img {
    max-width: 100%;
    max-height: 100%;
    object-fit: contain;
}

.gallery-card-label {
    font-size: 0.75rem;
    font-weight: 700;
    color: var(--text-primary);
    line-height: 1.2;
    word-break: break-word;
    display: -webkit-box;
    -webkit-line-clamp: 2;
    -webkit-box-orient: vertical;
    overflow: hidden;
    text-overflow: ellipsis;
    min-height: 2.4em;
}

.gallery-card-category {
    font-size: 0.6rem;
    font-weight: 600;
    color: var(--text-secondary);
    text-transform: uppercase;
    letter-spacing: 0.05em;
}

/* 2. Gallery Controls & Search */
.gallery-controls {
    display: flex;
    justify-content: space-between;
    align-items: center;
    gap: 1.5rem;
    margin-top: 1rem;
    flex-wrap: wrap;
}

.gallery-filter-buttons {
    display: flex;
    gap: 0.5rem;
    flex-wrap: wrap;
}

.gallery-filter-btn {
    background: var(--bg-tertiary);
    border: 1.5px solid var(--glass-border);
    color: var(--text-secondary);
    padding: 0.4rem 1rem;
    border-radius: 20px;
    font-family: var(--font-sans);
    font-weight: 600;
    font-size: 0.85rem;
    cursor: pointer;
    transition: var(--transition);
}

.gallery-filter-btn:hover {
    border-color: var(--warning);
    color: var(--text-primary);
}

.gallery-filter-btn.active {
    background: var(--warning);
    color: white;
    border-color: var(--warning);
    box-shadow: 0 4px 10px var(--warning-glow);
}

.gallery-search-box {
    position: relative;
    flex-grow: 1;
    max-width: 300px;
}

@media (max-width: 600px) {
    .gallery-search-box {
        max-width: 100%;
    }
}

.gallery-search-box input {
    width: 100%;
    background: var(--bg-tertiary);
    border: 1.5px solid var(--glass-border);
    color: var(--text-primary);
    padding: 0.45rem 1rem;
    border-radius: 20px;
    font-family: var(--font-sans);
    font-size: 0.85rem;
    outline: none;
    transition: var(--transition);
}

.gallery-search-box input:focus {
    border-color: var(--warning);
    box-shadow: 0 0 10px var(--warning-glow);
}

/* 3. Cumulative Dashboard Row */
.sign-dashboard-row {
    display: flex;
    justify-content: space-around;
    align-items: center;
    background: var(--bg-secondary);
    border: 1.5px solid var(--glass-border);
    border-radius: 12px;
    padding: 1.25rem;
    margin-bottom: 2rem;
    gap: 1rem;
    position: relative;
    animation: fadeIn 0.3s ease-out;
}

@media (max-width: 600px) {
    .sign-dashboard-row {
        flex-direction: column;
        gap: 1.5rem;
    }
}

.dash-stat {
    flex: 1;
    text-align: center;
    display: flex;
    flex-direction: column;
    align-items: center;
}

.dash-stat strong {
    font-size: 1.65rem;
    font-weight: 800;
    color: var(--warning);
    line-height: 1.1;
    margin-bottom: 0.2rem;
}

.dash-stat span {
    font-size: 0.75rem;
    color: var(--text-secondary);
    font-weight: 500;
    text-transform: uppercase;
    letter-spacing: 0.05em;
}

.reset-stats-btn {
    background: transparent;
    border: none;
    cursor: pointer;
    font-size: 1.1rem;
    opacity: 0.4;
    transition: var(--transition);
    position: absolute;
    right: 12px;
    top: 12px;
}

.reset-stats-btn:hover {
    opacity: 1;
    transform: scale(1.15);
}

/* 4. Analytics and Mistakes Review */
.sign-quiz-analytics {
    border-top: 1.5px solid var(--glass-border);
    padding-top: 1.5rem;
    margin-top: 1.5rem;
    text-align: left;
}

.sign-quiz-analytics h4 {
    font-size: 1.05rem;
    font-weight: 700;
    margin-bottom: 1rem;
    color: var(--text-primary);
}

.analytics-grid {
    display: grid;
    grid-template-columns: repeat(3, 1fr);
    gap: 1rem;
}

@media (max-width: 600px) {
    .analytics-grid {
        grid-template-columns: 1fr;
    }
}

.analytics-stat {
    background: var(--bg-secondary);
    border: 1px solid var(--glass-border);
    border-radius: 10px;
    padding: 0.85rem;
    text-align: center;
}

.analytics-stat .stat-num {
    display: block;
    font-size: 1.6rem;
    font-weight: 800;
    color: var(--warning);
    margin-bottom: 0.15rem;
}

.analytics-stat .stat-lbl {
    font-size: 0.7rem;
    color: var(--text-secondary);
    font-weight: 600;
    text-transform: uppercase;
    letter-spacing: 0.025em;
}

.review-section {
    border-top: 1.5px solid var(--glass-border);
    padding-top: 1.5rem;
    margin-top: 1.5rem;
    text-align: left;
}

.review-section h4 {
    font-size: 1.05rem;
    font-weight: 700;
    color: var(--danger);
    margin-bottom: 0.25rem;
}

.review-subtitle {
    font-size: 0.85rem;
    color: var(--text-secondary);
    margin-bottom: 1rem;
}

.review-cards-grid {
    display: grid;
    grid-template-columns: repeat(auto-fill, minmax(280px, 1fr));
    gap: 1rem;
    max-height: 350px;
    overflow-y: auto;
    padding: 0.5rem;
    border: 1.5px solid var(--glass-border);
    border-radius: 12px;
    background: var(--bg-secondary);
}

.review-card {
    background: var(--bg-tertiary);
    border: 1px solid var(--glass-border);
    border-radius: 10px;
    padding: 0.85rem;
    display: flex;
    align-items: center;
    gap: 0.85rem;
    transition: var(--transition);
}

.review-card:hover {
    border-color: rgba(239, 68, 68, 0.3);
    background: rgba(239, 68, 68, 0.02);
}

.review-card-img-wrapper {
    background: #ffffff;
    padding: 0.35rem;
    border-radius: 6px;
    width: 60px;
    height: 60px;
    display: flex;
    justify-content: center;
    align-items: center;
    flex-shrink: 0;
    box-shadow: 0 2px 5px rgba(0,0,0,0.1);
}

.review-card-img-wrapper img {
    max-width: 100%;
    max-height: 100%;
    object-fit: contain;
}

.review-card-info {
    display: flex;
    flex-direction: column;
    gap: 0.25rem;
    font-size: 0.8rem;
    flex-grow: 1;
}

.review-card-title {
    font-weight: 700;
    color: var(--text-primary);
    line-height: 1.2;
    margin-bottom: 0.15rem;
}

.review-card-choice {
    color: var(--danger);
    font-weight: 500;
}

.review-card-correct {
    color: var(--success);
    font-weight: 600;
}

/* 5. Buy Me A Coffee Floating Button */
.coffee-float-btn {
    position: fixed;
    bottom: 24px;
    right: 24px;
    background: #ffdd00; /* BMAC Yellow */
    color: #000000;
    text-decoration: none;
    font-family: var(--font-sans);
    font-weight: 700;
    font-size: 0.9rem;
    padding: 0.65rem 1.15rem;
    border-radius: 30px;
    display: flex;
    align-items: center;
    gap: 0.5rem;
    box-shadow: 0 4px 15px rgba(0, 0, 0, 0.25);
    z-index: 1000;
    transition: all 0.3s cubic-bezier(0.175, 0.885, 0.32, 1.275);
}

.coffee-float-btn:hover {
    transform: scale(1.08) translateY(-2px) rotate(-1deg);
    box-shadow: 0 6px 20px rgba(255, 221, 0, 0.35);
    background: #ffeb3b;
}

.coffee-icon {
    font-size: 1.15rem;
    animation: steam 1.5s ease-in-out infinite alternate;
    display: inline-block;
}

@keyframes steam {
    from { transform: translateY(0) scale(1); }
    to { transform: translateY(-1.5px) scale(1.05); }
}

@media (max-width: 600px) {
    .coffee-float-btn {
        bottom: 16px;
        right: 16px;
        padding: 0.55rem 0.9rem;
        font-size: 0.8rem;
    }
}