/* ===================================================
   WAEC CBT PRO - PRODUCTION STYLE SHEET
   EdTech Modern Design System
   =================================================== */

:root {
    /* Color Palette */
    --primary: #263d9b;        /* Brand Navy */
    --primary-light: #4d63b8;
    --primary-dark: #1a2b6f;
    --secondary: #f36523;      /* Brand Orange */
    --secondary-light: #ff8549;
    --secondary-dark: #d94e0f;
    --success: #10b981;        /* Green for correct */
    --danger: #ef4444;         /* Red for wrong */
    --warning: #f59e0b;        /* Orange for info */
    --neutral: #6b7280;        /* Gray */
    
    /* Backgrounds */
    --bg-primary: #ffffff;
    --bg-secondary: #f9fafb;
    --bg-tertiary: #f3f4f6;
    
    /* Text Colors */
    --text-primary: #111827;
    --text-secondary: #4b5563;
    --text-light: #9ca3af;
    
    /* Borders & Shadows */
    --border-color: #e5e7eb;
    --shadow-sm: 0 1px 2px rgba(0, 0, 0, 0.05);
    --shadow-md: 0 4px 6px rgba(0, 0, 0, 0.1);
    --shadow-lg: 0 10px 15px rgba(0, 0, 0, 0.1);
    
    /* Spacing */
    --spacing-xs: 4px;
    --spacing-sm: 8px;
    --spacing-md: 12px;
    --spacing-lg: 16px;
    --spacing-xl: 24px;
    --spacing-2xl: 32px;
    
    /* Transitions */
    --transition-fast: 150ms ease-in-out;
    --transition-normal: 300ms ease-in-out;
    --transition-slow: 500ms ease-in-out;
}

/* ===================================================
   RESET & BASE STYLES
   =================================================== */

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

/* SEO Content Styles */
.seo-content {
    margin-top: var(--spacing-2xl);
    padding: var(--spacing-2xl);
    background: var(--bg-primary);
    border-radius: 12px;
    box-shadow: var(--shadow-md);
    line-height: 1.8;
}

.seo-content h2 {
    font-size: 1.75rem;
    color: var(--primary-dark);
    margin-bottom: var(--spacing-lg);
    border-bottom: 3px solid var(--primary);
    padding-bottom: var(--spacing-sm);
}

.seo-content h3 {
    font-size: 1.35rem;
    color: var(--primary);
    margin-top: var(--spacing-xl);
    margin-bottom: var(--spacing-md);
}

.seo-content h4 {
    font-size: 1.1rem;
    color: var(--text-primary);
    margin-bottom: var(--spacing-sm);
    font-weight: 600;
}

.seo-content p {
    color: var(--text-secondary);
    margin-bottom: var(--spacing-lg);
}

.seo-content strong {
    color: var(--primary-dark);
    font-weight: 600;
}

.seo-content ol {
    margin-left: var(--spacing-xl);
    margin-bottom: var(--spacing-lg);
}

.seo-content ol li {
    margin-bottom: var(--spacing-md);
    color: var(--text-secondary);
}

.faq-section {
    margin-top: var(--spacing-lg);
}

.faq-item {
    background: var(--bg-tertiary);
    padding: var(--spacing-lg);
    border-radius: 8px;
    margin-bottom: var(--spacing-md);
    border-left: 4px solid var(--primary);
}

.faq-item h4 {
    color: var(--primary-dark);
    margin-bottom: var(--spacing-sm);
}

.faq-item p {
    margin-bottom: 0;
    color: var(--text-secondary);
}

.cta-text {
    font-size: 1.1rem;
    font-weight: 600;
    color: var(--primary);
    text-align: center;
    padding: var(--spacing-lg);
    background: linear-gradient(135deg, #e8ecfc 0%, #ffe4d6 100%);
    border-radius: 8px;
    margin-top: var(--spacing-xl);
}

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

body {
    font-family: -apple-system, BlinkMacSystemFont, 'Segoe UI', Roboto, 'Helvetica Neue', Arial, sans-serif;
    background-color: var(--bg-secondary);
    color: var(--text-primary);
    line-height: 1.6;
    -webkit-font-smoothing: antialiased;
    -moz-osx-font-smoothing: grayscale;
}

/* ===================================================
   LAYOUT STRUCTURE
   =================================================== */

.app-container {
    display: flex;
    flex-direction: column;
    min-height: 100vh;
    background: linear-gradient(135deg, #f9fafb 0%, #f0f4f8 100%);
}

.app-header {
    background: linear-gradient(135deg, var(--primary) 0%, var(--primary-dark) 100%);
    color: white;
    padding: var(--spacing-lg) var(--spacing-xl);
    box-shadow: var(--shadow-md);
    display: flex;
    justify-content: space-between;
    align-items: center;
    gap: var(--spacing-xl);
    position: sticky;
    top: 0;
    z-index: 100;
}

/* Skip link for keyboard users */
.skip-link {
    position: absolute;
    left: -9999px;
    top: auto;
    width: 1px;
    height: 1px;
    overflow: hidden;
}
.skip-link:focus {
    position: fixed;
    left: 16px;
    top: 16px;
    width: auto;
    height: auto;
    padding: 8px 12px;
    background: #111827;
    color: #fff;
    z-index: 1000;
    border-radius: 6px;
}

/* Help Icon & Tooltip */
.help-icon {
    display: inline-flex;
    align-items: center;
    justify-content: center;
    width: 18px;
    height: 18px;
    margin-left: 6px;
    background-color: var(--primary);
    color: white;
    border-radius: 50%;
    font-size: 0.75rem;
    font-weight: 700;
    cursor: help;
    position: relative;
    transition: background-color var(--transition-fast);
}
.help-icon:hover {
    background-color: var(--primary-dark);
}
.help-icon::after {
    content: attr(data-tooltip);
    position: absolute;
    bottom: 125%;
    left: 50%;
    transform: translateX(-50%);
    background-color: #111827;
    color: #fff;
    padding: 8px 12px;
    border-radius: 6px;
    font-size: 0.85rem;
    white-space: nowrap;
    z-index: 1001;
    opacity: 0;
    visibility: hidden;
    transition: opacity var(--transition-fast), visibility var(--transition-fast);
    pointer-events: none;
    box-shadow: var(--shadow-lg);
    font-weight: 400;
}
.help-icon::before {
    content: '';
    position: absolute;
    bottom: 115%;
    left: 50%;
    transform: translateX(-50%);
    border: 6px solid transparent;
    border-top-color: #111827;
    opacity: 0;
    visibility: hidden;
    transition: opacity var(--transition-fast), visibility var(--transition-fast);
    z-index: 1001;
}
.help-icon:hover::after,
.help-icon:focus::after {
    opacity: 1;
    visibility: visible;
}
.help-icon:hover::before,
.help-icon:focus::before {
    opacity: 1;
    visibility: visible;
}

/* Progress bar */
.progress {
    display: flex;
    align-items: center;
    gap: 10px;
    margin-left: 16px;
}
.progress-bar {
    width: 0%;
    height: 8px;
    background-color: var(--primary-light);
    box-shadow: var(--shadow-sm);
    border-radius: 999px;
    transition: width var(--transition-normal);
    min-width: 120px;
}
.progress-text {
    font-size: 0.85rem;
    color: #eef2ff;
}

/* Improved focus styles */
button:focus, .option-btn:focus, select:focus {
    outline: 3px solid #93c5fd;
    outline-offset: 2px;
}

/* ===================================================
   FOOTER
   =================================================== */

.app-footer {
    background: linear-gradient(135deg, #263d9b 0%, #4d63b8 100%);
    color: white;
    padding: var(--spacing-2xl) var(--spacing-xl);
    margin-top: auto;
}

.footer-content {
    max-width: 1200px;
    margin: 0 auto;
    display: grid;
    grid-template-columns: 1fr 2fr;
    gap: var(--spacing-2xl);
}

.footer-brand h3 {
    font-size: 1.5rem;
    font-weight: 700;
    margin-bottom: var(--spacing-sm);
}

.footer-brand p {
    color: #cbd5e1;
    font-size: 0.9rem;
}

.footer-links {
    display: grid;
    grid-template-columns: repeat(2, 1fr);
    gap: var(--spacing-xl);
}

.footer-column h4 {
    font-size: 1rem;
    margin-bottom: var(--spacing-md);
    color: #e0e7ff;
}

.footer-column ul {
    list-style: none;
}

.footer-column ul li {
    margin-bottom: var(--spacing-sm);
}

.footer-column ul li a {
    color: #cbd5e1;
    text-decoration: none;
    font-size: 0.9rem;
    transition: color var(--transition-fast);
}

.footer-column ul li a:hover {
    color: white;
    text-decoration: underline;
}

.footer-bottom {
    max-width: 1200px;
    margin: var(--spacing-xl) auto 0;
    padding-top: var(--spacing-lg);
    border-top: 1px solid rgba(255, 255, 255, 0.2);
    text-align: center;
}

.footer-bottom p {
    color: #cbd5e1;
    font-size: 0.85rem;
}

.footer-tagline {
    font-size: 0.8rem;
    color: #94a3b8;
    margin-top: var(--spacing-sm);
}

.footer-keywords {
    margin-top: var(--spacing-sm);
    font-size: 0.75rem;
    color: #94a3b8;
}

.header-logo {
    height: 80px;
    width: auto;
    display: block;
}

.header-left h1 {
    font-size: 1.75rem;
    font-weight: 700;
    margin-bottom: 2px;
    letter-spacing: -0.5px;
}

.header-subtitle {
    font-size: 0.875rem;
    opacity: 0.9;
    font-weight: 500;
}

.footer-logo {
    height: 90px;
    width: auto;
    margin-bottom: var(--spacing-md);
}
.header-right {
    display: flex;
    gap: var(--spacing-lg);
    align-items: center;
}

.timer-badge {
    background: rgba(255, 255, 255, 0.15);
    padding: var(--spacing-sm) var(--spacing-lg);
    border-radius: 8px;
    display: flex;
    align-items: center;
    gap: var(--spacing-sm);
    font-weight: 600;
    font-size: 0.95rem;
    border: 1px solid rgba(255, 255, 255, 0.2);
    animation: pulse-timer 2s infinite;
}

@keyframes pulse-timer {
    0%, 100% { opacity: 1; }
    50% { opacity: 0.8; }
}

.timer-icon {
    width: 20px;
    height: 20px;
    stroke-width: 2;
}

.subject-tag {
    background: rgba(255, 255, 255, 0.2);
    padding: var(--spacing-sm) var(--spacing-md);
    border-radius: 6px;
    font-size: 0.875rem;
    font-weight: 500;
    max-width: 200px;
    text-overflow: ellipsis;
    white-space: nowrap;
    overflow: hidden;
}

.main-container {
    flex: 1;
    padding: var(--spacing-2xl);
    max-width: 1400px;
    margin: 0 auto;
    width: 100%;
}

/* ===================================================
   SCREENS & VISIBILITY
   =================================================== */

.screen {
    display: none;
    animation: fadeIn var(--transition-normal);
}

.screen.active {
    display: block;
}

/* Prevent accidental oversized images from breaking layout */
.main-container img:not(.header-logo):not(.footer-logo) {
    max-width: 100%;
    height: auto;
    display: block;
}

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

/* ===================================================
   HOME SCREEN
   =================================================== */

/* Hero Section */
.hero-section {
    position: relative;
    background: linear-gradient(135deg, #263d9b 0%, #3b53b8 40%, #f36523 100%);
    border-radius: 20px;
    padding: 5rem 2rem;
    margin-bottom: var(--spacing-2xl);
    box-shadow: 0 20px 60px rgba(38, 61, 155, 0.4);
    text-align: center;
    color: white;
    min-height: 500px;
    display: flex;
    align-items: center;
    justify-content: center;
    overflow: hidden;
}

.hero-bg-image {
    position: absolute;
    top: 0;
    left: 0;
    right: 0;
    bottom: 0;
    background-image: url('images/Nigerian students.webp');
    background-size: cover;
    background-position: center;
    opacity: 0.3;
    z-index: 0;
}

.hero-overlay {
    position: absolute;
    top: 0;
    left: 0;
    right: 0;
    bottom: 0;
    background: linear-gradient(135deg, rgba(38, 61, 155, 0.95) 0%, rgba(59, 83, 184, 0.9) 40%, rgba(243, 101, 35, 0.85) 100%);
    z-index: 1;
}

.hero-content {
    position: relative;
    z-index: 2;
    max-width: 900px;
    margin: 0 auto;
}

.hero-badge {
    display: inline-block;
    background: rgba(255, 255, 255, 0.2);
    padding: 0.5rem 1.2rem;
    border-radius: 50px;
    font-size: 0.9rem;
    font-weight: 600;
    margin-bottom: var(--spacing-lg);
    border: 2px solid rgba(255, 255, 255, 0.3);
    backdrop-filter: blur(10px);
}

.hero-title {
    font-size: 3.5rem;
    font-weight: 900;
    margin-bottom: var(--spacing-lg);
    line-height: 1.2;
    text-shadow: 0 4px 12px rgba(0,0,0,0.4);
    letter-spacing: -1px;
}

.hero-title .highlight {
    color: #FFD700;
    position: relative;
}

.hero-subtitle {
    font-size: 1.25rem;
    opacity: 0.95;
    margin-bottom: 2.5rem;
    font-weight: 400;
    text-shadow: 0 2px 6px rgba(0,0,0,0.3);
    max-width: 700px;
    margin-left: auto;
    margin-right: auto;
    line-height: 1.6;
}

.hero-cta {
    display: flex;
    gap: 1rem;
    justify-content: center;
    margin-bottom: 3rem;
    flex-wrap: wrap;
}

.btn-hero-primary {
    background: white;
    color: var(--primary);
    padding: 1rem 2.5rem;
    font-size: 1.1rem;
    font-weight: 700;
    border-radius: 50px;
    border: none;
    cursor: pointer;
    display: inline-flex;
    align-items: center;
    justify-content: center;
    transition: all 0.3s ease;
    box-shadow: 0 8px 20px rgba(0, 0, 0, 0.2);
    text-decoration: none;
}

.btn-hero-primary:hover {
    transform: translateY(-3px);
    box-shadow: 0 12px 30px rgba(0, 0, 0, 0.3);
    background: #f8f9fa;
}

.btn-hero-secondary {
    background: transparent;
    color: white;
    padding: 1rem 2.5rem;
    font-size: 1.1rem;
    font-weight: 600;
    border-radius: 50px;
    border: 2px solid white;
    cursor: pointer;
    transition: all 0.3s ease;
}

.btn-hero-secondary:hover {
    background: rgba(255, 255, 255, 0.15);
    transform: translateY(-2px);
}

.hero-stats {
    display: flex;
    justify-content: center;
    gap: var(--spacing-xl);
    flex-wrap: wrap;
}

.stat-badge {
    background: rgba(255,255,255,0.25);
    backdrop-filter: blur(10px);
    border-radius: 12px;
    padding: 1.2rem 1.5rem;
    min-width: 140px;
    border: 2px solid rgba(255,255,255,0.4);
    box-shadow: 0 4px 12px rgba(0,0,0,0.15);
}

.stat-number {
    display: block;
    font-size: 2.25rem;
    font-weight: 900;
    margin-bottom: var(--spacing-xs);
    text-shadow: 0 2px 4px rgba(0,0,0,0.2);
}

.stat-label {
    display: block;
    font-size: 0.95rem;
    opacity: 1;
    font-weight: 600;
    text-shadow: 0 1px 2px rgba(0,0,0,0.15);
}

/* Quick Start Card */
.home-card {
    background: white;
    border-radius: 12px;
    padding: var(--spacing-2xl);
    box-shadow: var(--shadow-lg);
    margin-bottom: var(--spacing-2xl);
}

.quick-start-card {
    max-width: 700px;
    margin-left: auto;
    margin-right: auto;
}

.section-title {
    color: var(--text-primary);
    margin-bottom: var(--spacing-xl);
    font-size: 1.5rem;
    font-weight: 700;
    display: flex;
    align-items: center;
    gap: var(--spacing-sm);
}

.section-title.centered {
    justify-content: center;
    text-align: center;
}

.title-icon {
    width: 28px;
    height: 28px;
    color: var(--primary);
}

.setup-form {
    display: flex;
    flex-direction: column;
    gap: var(--spacing-lg);
}

.home-card h2 {
    font-size: 2.2rem;
    margin-bottom: var(--spacing-md);
    color: var(--primary);
}

.home-card > p {
    color: var(--text-secondary);
    margin-bottom: var(--spacing-2xl);
    font-size: 1.05rem;
}

.form-group {
    margin-bottom: 0;
}

.form-group label {
    display: flex;
    align-items: center;
    gap: var(--spacing-xs);
    margin-bottom: var(--spacing-sm);
    font-weight: 600;
    color: var(--text-primary);
}

.label-icon {
    width: 20px;
    height: 20px;
    color: var(--primary);
    flex-shrink: 0;
}

.question-count-grid {
    display: grid;
    grid-template-columns: repeat(4, 1fr);
    gap: var(--spacing-md);
    margin-bottom: var(--spacing-md);
}

.count-option {
    cursor: pointer;
}

.count-option input[type="radio"] {
    position: absolute;
    opacity: 0;
    pointer-events: none;
}

.count-card {
    display: flex;
    flex-direction: column;
    align-items: center;
    padding: var(--spacing-md);
    border: 2px solid var(--border-color);
    border-radius: 8px;
    background: white;
    transition: all var(--transition-fast);
}

.count-option:hover .count-card {
    border-color: var(--primary-light);
    transform: translateY(-2px);
    box-shadow: var(--shadow-sm);
}

.count-option input[type="radio"]:checked + .count-card {
    border-color: var(--primary);
    background: #e8ecfc;
    box-shadow: 0 0 0 3px rgba(38, 61, 155, 0.1);
}

.count-number {
    font-size: 1.75rem;
    font-weight: 700;
    color: var(--primary);
    margin-bottom: var(--spacing-xs);
}

.count-desc {
    font-size: 0.875rem;
    color: var(--text-secondary);
    font-weight: 500;
}

.subject-select {
    width: 100%;
    padding: var(--spacing-md) var(--spacing-lg);
    border: 2px solid var(--border-color);
    border-radius: 8px;
    font-size: 1rem;
    cursor: pointer;
    background: white;
    color: var(--text-primary);
    transition: all var(--transition-fast);
}

.subject-select:hover {
    border-color: var(--primary-light);
}

.subject-select:focus {
    outline: none;
    border-color: var(--primary);
    box-shadow: 0 0 0 3px rgba(38, 61, 155, 0.1);
}

.info-box {
    background: var(--bg-tertiary);
    border-left: 4px solid var(--primary);
    padding: var(--spacing-lg);
    border-radius: 6px;
    margin-top: var(--spacing-xl);
}

.info-box h4 {
    color: var(--primary);
    margin-bottom: var(--spacing-md);
    font-size: 1rem;
}

.info-box ul {
    list-style: none;
    padding-left: var(--spacing-lg);
}

.info-box li {
    margin-bottom: var(--spacing-sm);
    color: var(--text-secondary);
    font-size: 0.95rem;
}

/* Features Grid */
.features-grid {
    display: grid;
    grid-template-columns: repeat(auto-fit, minmax(260px, 1fr));
    gap: var(--spacing-xl);
    margin-bottom: var(--spacing-2xl);
}

.feature-card {
    background: white;
    border-radius: 12px;
    padding: var(--spacing-xl);
    box-shadow: var(--shadow-md);
    text-align: center;
    transition: all var(--transition-normal);
}

.feature-card:hover {
    transform: translateY(-5px);
    box-shadow: var(--shadow-lg);
}

.feature-icon {
    width: 60px;
    height: 60px;
    margin: 0 auto var(--spacing-lg);
    border-radius: 12px;
    display: flex;
    align-items: center;
    justify-content: center;
}

.feature-icon svg {
    width: 32px;
    height: 32px;
    stroke-width: 2.5;
}

.feature-icon.blue {
    background: #e8ecfc;
    color: #263d9b;
}

.feature-icon.green {
    background: #d1fae5;
    color: #059669;
}

.feature-icon.orange {
    background: #ffe4d6;
    color: #f36523;
}

.feature-icon.purple {
    background: #e9d5ff;
    color: #7c3aed;
}

.feature-card h3 {
    font-size: 1.25rem;
    font-weight: 700;
    color: var(--text-primary);
    margin-bottom: var(--spacing-sm);
}

.feature-card p {
    color: var(--text-secondary);
    font-size: 0.95rem;
    line-height: 1.6;
}

/* Benefits Section */
.benefits-section {
    background: white;
    border-radius: 12px;
    padding: var(--spacing-2xl);
    box-shadow: var(--shadow-md);
    margin-bottom: var(--spacing-2xl);
}

.benefits-list {
    max-width: 800px;
    margin: 0 auto;
}

.benefit-item {
    display: flex;
    gap: var(--spacing-md);
    margin-bottom: var(--spacing-lg);
    padding: var(--spacing-md);
    border-radius: 8px;
    transition: background var(--transition-fast);
}

.benefit-item:hover {
    background: var(--bg-tertiary);
}

.benefit-icon {
    flex-shrink: 0;
    width: 24px;
    height: 24px;
    background: var(--success);
    color: white;
    border-radius: 50%;
    display: flex;
    align-items: center;
    justify-content: center;
    font-weight: 700;
    font-size: 1rem;
}

.benefit-item strong {
    color: var(--primary);
}

.benefit-item div {
    color: var(--text-secondary);
    font-size: 0.95rem;
    line-height: 1.6;
}

/* ===================================================
   BUTTONS
   =================================================== */

.btn {
    padding: var(--spacing-md) var(--spacing-lg);
    border: none;
    border-radius: 8px;
    font-size: 1rem;
    font-weight: 600;
    cursor: pointer;
    transition: all var(--transition-fast);
    text-transform: uppercase;
    letter-spacing: 0.5px;
    display: inline-flex;
    align-items: center;
    justify-content: center;
    gap: var(--spacing-sm);
    white-space: nowrap;
}

.btn:disabled {
    opacity: 0.5;
    cursor: not-allowed;
}

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

.btn-primary:hover:not(:disabled) {
    background: var(--secondary);
    transform: translateY(-2px);
    box-shadow: var(--shadow-md);
}

.btn-secondary {
    background: var(--bg-tertiary);
    color: var(--text-primary);
    border: 2px solid var(--border-color);
}

.btn-secondary:hover:not(:disabled) {
    background: var(--bg-secondary);
    border-color: var(--primary);
    color: var(--primary);
}

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

.btn-danger:hover:not(:disabled) {
    background: #dc2626;
    transform: translateY(-2px);
    box-shadow: var(--shadow-md);
}

.btn-outline {
    background: transparent;
    color: var(--primary);
    border: 2px solid var(--primary);
}

.btn-outline:hover:not(:disabled) {
    background: var(--primary);
    color: white;
}

.btn-lg {
    padding: var(--spacing-lg) var(--spacing-2xl);
    font-size: 1.05rem;
}

.btn-start {
    display: flex;
    align-items: center;
    justify-content: center;
    gap: var(--spacing-sm);
    width: 100%;
    max-width: 340px;
    margin: 0 auto;
    font-weight: 700;
    font-size: 1.1rem;
    padding: 1rem 2rem;
}
.btn-start svg {
    width: 18px;
    height: 18px;
}

/* ===================================================
   EXAM LAYOUT
   =================================================== */

.exam-layout {
    display: grid;
    grid-template-columns: 250px 1fr;
    gap: var(--spacing-xl);
    height: calc(100vh - 200px);
}

.question-sidebar {
    background: white;
    border-radius: 12px;
    padding: var(--spacing-lg);
    box-shadow: var(--shadow-md);
    overflow-y: auto;
    position: sticky;
    top: 100px;
    max-height: calc(100vh - 150px);
}

.sidebar-header {
    display: flex;
    justify-content: space-between;
    align-items: center;
    margin-bottom: var(--spacing-lg);
    padding-bottom: var(--spacing-md);
    border-bottom: 2px solid var(--border-color);
}

.sidebar-header h3 {
    font-size: 1rem;
    color: var(--text-primary);
}

.question-counter {
    font-size: 0.85rem;
    background: var(--primary);
    color: white;
    padding: 2px 8px;
    border-radius: 12px;
    font-weight: 600;
}

.question-grid,
.review-grid {
    display: grid;
    grid-template-columns: repeat(auto-fill, minmax(40px, 1fr));
    gap: var(--spacing-sm);
}

.q-indicator {
    width: 40px;
    height: 40px;
    border-radius: 6px;
    display: flex;
    align-items: center;
    justify-content: center;
    font-size: 0.75rem;
    font-weight: 700;
    cursor: pointer;
    transition: all var(--transition-fast);
    background: var(--bg-tertiary);
    color: var(--text-primary);
    border: 2px solid transparent;
}

.q-indicator:hover {
    transform: scale(1.1);
    border-color: var(--primary);
}

.q-indicator.current {
    background: var(--primary);
    color: white;
    box-shadow: 0 0 0 3px rgba(30, 64, 175, 0.2);
}

.q-indicator.answered {
    background: var(--success);
    color: white;
}

.q-indicator.unanswered {
    background: var(--danger);
    color: white;
    opacity: 0.6;
}

/* REVIEW MODE INDICATORS */
.q-indicator.review-correct {
    background: var(--success);
    color: white;
}

.q-indicator.review-wrong {
    background: var(--danger);
    color: white;
}

/* ===================================================
   EXAM CONTENT
   =================================================== */

.exam-content,
.review-content {
    background: white;
    border-radius: 12px;
    padding: var(--spacing-2xl);
    box-shadow: var(--shadow-md);
    display: flex;
    flex-direction: column;
    overflow-y: auto;
    max-height: calc(100vh - 150px);
}

.question-display {
    margin-bottom: var(--spacing-2xl);
}

.question-meta {
    display: flex;
    justify-content: space-between;
    align-items: center;
    margin-bottom: var(--spacing-md);
    padding-bottom: var(--spacing-md);
    border-bottom: 2px solid var(--border-color);
}

.question-number {
    font-size: 0.85rem;
    color: var(--text-secondary);
    font-weight: 600;
    text-transform: uppercase;
    letter-spacing: 0.5px;
}

.question-text {
    font-size: 1.1rem;
    line-height: 1.8;
    color: var(--text-primary);
    font-weight: 500;
    margin-bottom: var(--spacing-xl);
}

/* ===================================================
   OPTIONS GRID
   =================================================== */

.options-grid {
    display: grid;
    grid-template-columns: 1fr 1fr;
    gap: var(--spacing-lg);
    margin-bottom: var(--spacing-2xl);
    flex: 1;
}

.option-btn {
    padding: var(--spacing-lg);
    border: 2px solid var(--border-color);
    background: var(--bg-tertiary);
    border-radius: 8px;
    cursor: pointer;
    text-align: left;
    transition: all var(--transition-fast);
    color: var(--text-primary);
    font-weight: 500;
    font-size: 0.95rem;
    line-height: 1.4;
}

.option-btn:hover:not(:disabled) {
    border-color: var(--primary);
    background: var(--bg-secondary);
    transform: translateY(-2px);
    box-shadow: var(--shadow-sm);
}

.option-btn.selected {
    border-color: var(--primary);
    background: rgba(30, 64, 175, 0.08);
    color: var(--primary);
    font-weight: 600;
}

/* REVIEW MODE: CORRECT & WRONG ANSWERS */
.option-btn.correct {
    border-color: var(--success);
    background: rgba(16, 185, 129, 0.1);
    color: var(--success);
    font-weight: 600;
}

.option-btn.correct::before {
    content: "✓ ";
    font-weight: 700;
    margin-right: 4px;
}

.option-btn.wrong {
    border-color: var(--danger);
    background: rgba(239, 68, 68, 0.1);
    color: var(--danger);
    font-weight: 600;
}

.option-btn.wrong::before {
    content: "✗ ";
    font-weight: 700;
    margin-right: 4px;
}

.option-btn:disabled {
    cursor: not-allowed;
    opacity: 1;
}

/* ===================================================
   EXAM CONTROLS
   =================================================== */

.exam-controls,
.review-controls {
    display: flex;
    gap: var(--spacing-lg);
    justify-content: center;
    padding-top: var(--spacing-xl);
    border-top: 2px solid var(--border-color);
    margin-top: auto;
}

.exam-controls .btn,
.review-controls .btn {
    flex: 1;
    max-width: 200px;
}

/* ===================================================
   RESULTS SCREEN
   =================================================== */

.results-card {
    background: white;
    border-radius: 12px;
    padding: var(--spacing-2xl);
    box-shadow: var(--shadow-lg);
    max-width: 700px;
    margin: 0 auto;
    text-align: center;
}

.results-header {
    margin-bottom: var(--spacing-2xl);
}

.results-header h2 {
    font-size: 2rem;
    color: var(--primary);
    margin-bottom: var(--spacing-lg);
}

.score-display {
    font-size: 4rem;
    font-weight: 700;
    color: var(--success);
    text-shadow: 0 2px 4px rgba(0, 0, 0, 0.1);
    margin-bottom: var(--spacing-lg);
}

/* ===================================================
   RESULTS STATS
   =================================================== */

.results-stats {
    display: grid;
    grid-template-columns: repeat(3, 1fr);
    gap: var(--spacing-lg);
    margin-bottom: var(--spacing-2xl);
}

.stat-box {
    background: var(--bg-tertiary);
    padding: var(--spacing-lg);
    border-radius: 8px;
    border: 2px solid var(--border-color);
}

.stat-label {
    display: block;
    font-size: 0.85rem;
    color: var(--text-secondary);
    text-transform: uppercase;
           font-size: 1.85rem;
    font-weight: 600;
    margin-bottom: var(--spacing-sm);
}

.stat-value {
    display: block;
    font-size: 2rem;
    font-weight: 700;
    color: var(--primary);
}

/* ===================================================
   REVIEW LAYOUT
   =================================================== */

.review-layout {
    display: grid;
    grid-template-columns: 250px 1fr;
    gap: var(--spacing-xl);
    height: calc(100vh - 200px);
}

.review-sidebar {
    position: sticky;
    top: 100px;
}

.review-content {
    padding: var(--spacing-2xl);
}

/* ===================================================
   MOBILE RESPONSIVE
   =================================================== */

@media (max-width: 768px) {
    .main-container {
        padding: var(--spacing-lg);
    }

    .app-header {
        flex-direction: column;
        gap: var(--spacing-md);
        align-items: flex-start;
    }

    .header-right {
        width: 100%;
        justify-content: space-between;
    }

    /* Mobile auth adjustments */
    .google-signin-btn span {
        display: none;
    }

    .google-signin-btn {
        padding: 8px;
    }

    .user-name {
        display: none;
    }

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

    .stat-history-item {
        grid-template-columns: 1fr;
        gap: 8px;
    }

    .stat-score {
        text-align: left;
    }

    .header-logo {
        height: 60px;
    }

    .footer-logo {
        height: 70px;
    }

    .hero-section {
        padding: 2.5rem var(--spacing-lg);
    }

    .hero-title {
        font-size: 2rem;
    }

    .hero-subtitle {
        font-size: 1.1rem;
    }

    .hero-stats {
        gap: var(--spacing-md);
    }

    .stat-badge {
        min-width: 100px;
        padding: var(--spacing-sm) var(--spacing-md);
    }

    .stat-number {
        font-size: 1.85rem;
    }

    .home-card {
        padding: var(--spacing-lg);
    }

    .home-card h2 {
        font-size: 1.5rem;
    }

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

    .features-grid {
        grid-template-columns: 1fr;
        gap: var(--spacing-lg);
    }

    .benefits-section {
        padding: var(--spacing-lg);
    }

    .exam-layout,
    .review-layout {
        grid-template-columns: 1fr;
        height: auto;
        gap: var(--spacing-md);
    }

    .question-sidebar,
    .review-sidebar {
        position: relative;
        top: 0;
        max-height: none;
        max-height: 120px;
    }

    .question-grid,
    .review-grid {
        grid-template-columns: repeat(auto-fill, minmax(32px, 1fr));
    }

    .q-indicator {
        width: 32px;
        height: 32px;
        font-size: 0.7rem;
    }

    .exam-content,
    .review-content {
        max-height: none;
    }

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

    .results-stats {
        grid-template-columns: 1fr;
    }

    .exam-controls,
    .review-controls {
        flex-direction: column;
    }

    .exam-controls .btn,
    .review-controls .btn {
        max-width: none;
    }

    .option-btn {
        padding: var(--spacing-md);
    }

    .subject-select {
        font-size: 16px; /* Prevent zoom on iOS */
    }

    .progress {
        width: 100%;
        margin: 8px 0 0 0;
    }
    .progress-bar {
        flex: 1 1 auto;
        min-width: 0;
    }

    /* Tooltips on mobile - show below instead */
    .help-icon::after {
        bottom: auto;
        top: 125%;
        white-space: normal;
        max-width: 200px;
        width: 200px;
    }
    .help-icon::before {
        bottom: auto;
        top: 115%;
        border: 6px solid transparent;
        border-top-color: transparent;
        border-bottom-color: #111827;
    }

    .timer-badge {
        padding: var(--spacing-sm);
    }

    #timer-display {
        font-size: 0.85rem;
    }

    /* Footer responsive */
    .footer-content {
        grid-template-columns: 1fr;
        gap: var(--spacing-lg);
    }

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

    .app-footer {
        padding: var(--spacing-xl) var(--spacing-lg);
    }
}

@media (max-width: 480px) {
    .home-card {
        padding: var(--spacing-md);
    }

    .home-card h2 {
        font-size: 1.25rem;
    }

    .header-left h1 {
        font-size: 1.25rem;
    }

    .header-subtitle {
        display: none;
    }

    .score-display {
        font-size: 3rem;
    }

    .question-grid,
    .review-grid {
        grid-template-columns: repeat(auto-fill, minmax(28px, 1fr));
    }

    .q-indicator {
        width: 28px;
        height: 28px;
        font-size: 0.65rem;
    }
}

/* ===================================================
   SCROLLBAR STYLING
   =================================================== */

.question-sidebar::-webkit-scrollbar,
.exam-content::-webkit-scrollbar,
.review-content::-webkit-scrollbar {
    width: 6px;
}

.question-sidebar::-webkit-scrollbar-track,
.exam-content::-webkit-scrollbar-track,
.review-content::-webkit-scrollbar-track {
    background: var(--bg-secondary);
    border-radius: 10px;
}

.question-sidebar::-webkit-scrollbar-thumb,
.exam-content::-webkit-scrollbar-thumb,
.review-content::-webkit-scrollbar-thumb {
    background: var(--primary);
    border-radius: 10px;
}

.question-sidebar::-webkit-scrollbar-thumb:hover,
.exam-content::-webkit-scrollbar-thumb:hover,
.review-content::-webkit-scrollbar-thumb:hover {
    background: var(--primary-dark);
}

/* ===================================================
   AUTHENTICATION STYLES
   =================================================== */

.user-section {
    display: flex;
    align-items: center;
    gap: var(--spacing-md);
    position: relative;
}

/* Google Sign-In Button */
.google-signin-btn {
    display: flex;
    align-items: center;
    gap: var(--spacing-sm);
    background: white;
    border: 1px solid var(--border-color);
    border-radius: 8px;
    padding: 8px 16px;
    font-size: 14px;
    font-weight: 500;
    color: var(--text-primary);
    cursor: pointer;
    transition: all var(--transition-fast);
    box-shadow: var(--shadow-sm);
}

.google-signin-btn:hover {
    box-shadow: var(--shadow-md);
    background: var(--bg-secondary);
}

.google-icon {
    width: 20px;
    height: 20px;
}

/* User Profile */
.user-profile {
    display: flex;
    align-items: center;
    gap: var(--spacing-sm);
    padding: 4px 8px;
    border-radius: 8px;
    cursor: pointer;
    transition: background var(--transition-fast);
}

.user-profile:hover {
    background: var(--bg-secondary);
}

.user-avatar {
    width: 36px;
    height: 36px;
    border-radius: 50%;
    border: 2px solid var(--primary);
    object-fit: cover;
}

.user-info {
    display: flex;
    align-items: center;
    gap: 4px;
}

.user-name {
    font-weight: 600;
    color: var(--text-primary);
    font-size: 14px;
}

.user-menu-btn {
    background: none;
    border: none;
    color: var(--text-secondary);
    cursor: pointer;
    font-size: 16px;
    padding: 0 4px;
}

/* User Dropdown Menu */
.user-dropdown {
    position: absolute;
    top: calc(100% + 8px);
    right: 0;
    background: white;
    border: 1px solid var(--border-color);
    border-radius: 8px;
    box-shadow: var(--shadow-lg);
    min-width: 200px;
    z-index: 1000;
    overflow: hidden;
}

.dropdown-item {
    display: flex;
    align-items: center;
    gap: var(--spacing-sm);
    padding: 12px 16px;
    cursor: pointer;
    transition: background var(--transition-fast);
    color: var(--text-primary);
    font-size: 14px;
}

.dropdown-item:hover {
    background: var(--bg-secondary);
}

.dropdown-item svg {
    width: 18px;
    height: 18px;
    stroke-width: 2;
}

.dropdown-divider {
    height: 1px;
    background: var(--border-color);
    margin: 4px 0;
}

/* Notification Toast */
.notification {
    position: fixed;
    top: 20px;
    right: 20px;
    background: white;
    padding: 16px 20px;
    border-radius: 8px;
    box-shadow: var(--shadow-lg);
    font-size: 14px;
    font-weight: 500;
    z-index: 10000;
    transform: translateX(400px);
    transition: transform var(--transition-normal);
    border-left: 4px solid var(--primary);
    min-width: 250px;
}

.notification.show {
    transform: translateX(0);
}

.notification-success {
    border-left-color: var(--success);
}

.notification-error {
    border-left-color: var(--danger);
}

.notification-info {
    border-left-color: var(--primary);
}

/* Stats Modal */
.stats-modal {
    position: fixed;
    top: 0;
    left: 0;
    right: 0;
    bottom: 0;
    background: rgba(0, 0, 0, 0.6);
    display: flex;
    align-items: center;
    justify-content: center;
    z-index: 9999;
    padding: 20px;
    opacity: 0;
    transition: opacity var(--transition-normal);
}

.stats-modal.show {
    opacity: 1;
}

.stats-modal-content {
    background: white;
    border-radius: 16px;
    max-width: 800px;
    width: 100%;
    max-height: 90vh;
    overflow: auto;
    box-shadow: 0 20px 25px rgba(0, 0, 0, 0.15);
}

.stats-modal-header {
    display: flex;
    justify-content: space-between;
    align-items: center;
    padding: 24px;
    border-bottom: 1px solid var(--border-color);
}

.stats-modal-header h2 {
    margin: 0;
    color: var(--text-primary);
    font-size: 24px;
}

.close-modal {
    background: none;
    border: none;
    font-size: 32px;
    color: var(--text-secondary);
    cursor: pointer;
    padding: 0;
    width: 32px;
    height: 32px;
    display: flex;
    align-items: center;
    justify-content: center;
    border-radius: 4px;
    transition: all var(--transition-fast);
}

.close-modal:hover {
    background: var(--bg-secondary);
    color: var(--text-primary);
}

.stats-modal-body {
    padding: 24px;
}

.stats-summary {
    display: grid;
    grid-template-columns: repeat(auto-fit, minmax(150px, 1fr));
    gap: 16px;
    margin-bottom: 32px;
}

.stat-card {
    background: var(--bg-secondary);
    padding: 20px;
    border-radius: 12px;
    text-align: center;
}

.stat-value {
    font-size: 32px;
    font-weight: 700;
    color: var(--primary);
    margin-bottom: 8px;
}

.stat-label {
    font-size: 14px;
    color: var(--text-secondary);
    font-weight: 500;
}

.stats-history h3 {
    margin: 0 0 16px 0;
    color: var(--text-primary);
    font-size: 18px;
}

.stat-history-item {
    display: grid;
    grid-template-columns: 100px 1fr 120px;
    gap: 12px;
    align-items: center;
    padding: 12px;
    background: var(--bg-secondary);
    border-radius: 8px;
    margin-bottom: 8px;
    font-size: 14px;
}

.stat-date {
    color: var(--text-secondary);
}

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

.stat-score {
    text-align: right;
    font-weight: 600;
}

.stat-score.pass {
    color: var(--success);
}

.stat-score.fail {
    color: var(--danger);
}

.no-stats {
    text-align: center;
    color: var(--text-secondary);
    padding: 40px 20px;
    font-size: 14px;
}

/* ===================================================
   ACCESSIBILITY & PRINT
   =================================================== */

@media print {
    .app-header,
    .exam-controls,
    .review-controls {
        display: none;
    }
}

@media (prefers-reduced-motion: reduce) {
    * {
        animation-duration: 0.01ms !important;
        animation-iteration-count: 1 !important;
        transition-duration: 0.01ms !important;
    }
}

/* ===================================================
   NEWSLETTER MODAL
   =================================================== */

.newsletter-modal {
    display: none;
    position: fixed;
    top: 0;
    left: 0;
    width: 100%;
    height: 100%;
    background: rgba(0, 0, 0, 0.7);
    backdrop-filter: blur(5px);
    z-index: 10000;
    animation: fadeIn 0.3s ease;
}

.newsletter-modal.active {
    display: flex;
    align-items: center;
    justify-content: center;
}

.newsletter-content {
    background: var(--bg-primary);
    border-radius: 20px;
    padding: 40px;
    max-width: 500px;
    width: 90%;
    position: relative;
    box-shadow: 0 20px 60px rgba(0, 0, 0, 0.3);
    animation: slideUp 0.4s ease;
    text-align: center;
}

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

.newsletter-icon {
    width: 80px;
    height: 80px;
    margin: 0 auto 20px;
    background: linear-gradient(135deg, var(--primary), var(--accent));
    border-radius: 50%;
    display: flex;
    align-items: center;
    justify-content: center;
}

.newsletter-icon svg {
    width: 40px;
    height: 40px;
    stroke: white;
}

.newsletter-content h2 {
    color: var(--text-primary);
    font-size: 28px;
    margin-bottom: 10px;
    font-weight: 700;
}

.newsletter-subtitle {
    color: var(--text-secondary);
    font-size: 16px;
    margin-bottom: 30px;
    line-height: 1.6;
}

.newsletter-input {
    width: 100%;
    padding: 16px 20px;
    font-size: 16px;
    border: 2px solid var(--border);
    border-radius: 12px;
    background: var(--bg-secondary);
    color: var(--text-primary);
    transition: all 0.3s ease;
    margin-bottom: 16px;
}

.newsletter-input:focus {
    outline: none;
    border-color: var(--primary);
    box-shadow: 0 0 0 4px rgba(54, 82, 155, 0.1);
}

.newsletter-input::placeholder {
    color: var(--text-secondary);
}

.checkbox-group {
    text-align: left;
    margin-bottom: 20px;
}

.checkbox-label {
    display: flex;
    align-items: flex-start;
    gap: 10px;
    cursor: pointer;
    color: var(--text-secondary);
    font-size: 14px;
    line-height: 1.5;
}

.checkbox-label input[type="checkbox"] {
    margin-top: 2px;
    width: 18px;
    height: 18px;
    cursor: pointer;
    accent-color: var(--primary);
}

.newsletter-submit {
    width: 100%;
    padding: 16px;
    font-size: 16px;
    font-weight: 600;
    border-radius: 12px;
    margin-bottom: 16px;
    transition: all 0.3s ease;
}

.newsletter-submit:hover {
    transform: translateY(-2px);
    box-shadow: 0 8px 20px rgba(54, 82, 155, 0.3);
}

.newsletter-skip {
    background: none;
    border: none;
    color: var(--text-secondary);
    font-size: 14px;
    cursor: pointer;
    padding: 10px;
    transition: color 0.3s ease;
}

.newsletter-skip:hover {
    color: var(--text-primary);
}

.modal-close {
    position: absolute;
    top: 20px;
    right: 20px;
    background: none;
    border: none;
    font-size: 32px;
    color: var(--text-secondary);
    cursor: pointer;
    width: 40px;
    height: 40px;
    display: flex;
    align-items: center;
    justify-content: center;
    border-radius: 50%;
    transition: all 0.3s ease;
}

.modal-close:hover {
    background: var(--bg-secondary);
    color: var(--text-primary);
}

/* Mobile Responsive */
@media (max-width: 768px) {
    .newsletter-content {
        padding: 30px 20px;
        border-radius: 16px;
    }

    .newsletter-content h2 {
        font-size: 24px;
    }

    .newsletter-subtitle {
        font-size: 14px;
    }

    .newsletter-icon {
        width: 60px;
        height: 60px;
    }

    .newsletter-icon svg {
        width: 30px;
        height: 30px;
    }
}

/* ===================================================
   CUSTOM CONFIRM MODAL
   =================================================== */

.confirm-modal {
    display: none;
    position: fixed;
    top: 0;
    left: 0;
    width: 100%;
    height: 100%;
    background: rgba(0, 0, 0, 0.6);
    backdrop-filter: blur(4px);
    z-index: 9999;
    opacity: 0;
    transition: opacity 0.3s ease;
}

.confirm-modal.show {
    display: flex;
    align-items: center;
    justify-content: center;
    opacity: 1;
}

.confirm-content {
    background: var(--bg-primary);
    border-radius: 16px;
    padding: 32px;
    max-width: 400px;
    width: 90%;
    box-shadow: 0 20px 60px rgba(0, 0, 0, 0.3);
    animation: modalSlideIn 0.3s ease;
}

@keyframes modalSlideIn {
    from {
        opacity: 0;
        transform: translateY(-20px) scale(0.95);
    }
    to {
        opacity: 1;
        transform: translateY(0) scale(1);
    }
}

.confirm-content h3 {
    color: var(--text-primary);
    font-size: 22px;
    margin: 0 0 12px 0;
    font-weight: 600;
}

.confirm-content p {
    color: var(--text-secondary);
    font-size: 15px;
    line-height: 1.6;
    margin: 0 0 24px 0;
}

.confirm-buttons {
    display: flex;
    gap: 12px;
    justify-content: flex-end;
}

.confirm-buttons .btn {
    padding: 10px 20px;
    font-size: 15px;
    border-radius: 8px;
    min-width: 90px;
}

/* ===================================================
   LOADING SPINNER
   =================================================== */

.app-loader {
    display: none;
    position: fixed;
    top: 0;
    left: 0;
    width: 100%;
    height: 100%;
    background: rgba(0, 0, 0, 0.7);
    backdrop-filter: blur(6px);
    z-index: 10001;
    opacity: 0;
    transition: opacity 0.3s ease;
}

.app-loader.show {
    display: flex;
    align-items: center;
    justify-content: center;
    opacity: 1;
}

.loader-content {
    text-align: center;
}

.spinner {
    width: 60px;
    height: 60px;
    margin: 0 auto 20px;
    border: 4px solid rgba(255, 255, 255, 0.2);
    border-top-color: var(--primary);
    border-radius: 50%;
    animation: spin 0.8s linear infinite;
}

@keyframes spin {
    to { transform: rotate(360deg); }
}

.loader-text {
    color: white;
    font-size: 16px;
    font-weight: 500;
}

/* Enhanced Notification Styles */
.notification {
    position: fixed;
    top: 80px;
    right: 20px;
    background: var(--bg-primary);
    color: var(--text-primary);
    padding: 16px 20px;
    border-radius: 12px;
    box-shadow: 0 8px 30px rgba(0, 0, 0, 0.2);
    z-index: 10000;
    opacity: 0;
    transform: translateX(400px);
    transition: all 0.4s cubic-bezier(0.68, -0.55, 0.265, 1.55);
    max-width: 350px;
    border-left: 4px solid var(--primary);
}

.notification.show {
    opacity: 1;
    transform: translateX(0);
}

.notification-success {
    border-left-color: var(--success);
    background: linear-gradient(135deg, rgba(76, 175, 80, 0.1), var(--bg-primary));
}

.notification-error {
    border-left-color: var(--danger);
    background: linear-gradient(135deg, rgba(244, 67, 54, 0.1), var(--bg-primary));
}

.notification-warning {
    border-left-color: #ff9800;
    background: linear-gradient(135deg, rgba(255, 152, 0, 0.1), var(--bg-primary));
}

.notification-info {
    border-left-color: var(--info);
    background: linear-gradient(135deg, rgba(33, 150, 243, 0.1), var(--bg-primary));
}

@media (max-width: 768px) {
    .notification {
        right: 10px;
        left: 10px;
        max-width: calc(100% - 20px);
        top: 70px;
    }

    .confirm-content {
        padding: 24px;
    }

    .confirm-buttons {
        flex-direction: column-reverse;
    }

    .confirm-buttons .btn {
        width: 100%;
    }
}

/* ===================================================
   KEYBOARD SHORTCUTS MODAL
   =================================================== */

.shortcuts-modal {
    display: none;
    position: fixed;
    top: 0;
    left: 0;
    width: 100%;
    height: 100%;
    background: rgba(0, 0, 0, 0.6);
    backdrop-filter: blur(4px);
    z-index: 9998;
    align-items: center;
    justify-content: center;
    opacity: 0;
    transition: opacity 0.3s ease;
}

.shortcuts-modal.active {
    opacity: 1;
}

.shortcuts-content {
    background: var(--bg-primary);
    border-radius: 16px;
    padding: 32px;
    max-width: 500px;
    width: 90%;
    box-shadow: 0 20px 60px rgba(0, 0, 0, 0.3);
}

.shortcuts-content h2 {
    color: var(--text-primary);
    font-size: 24px;
    margin: 0 0 24px 0;
    text-align: center;
}

.shortcuts-grid {
    display: grid;
    grid-template-columns: 1fr;
    gap: 16px;
    margin-bottom: 20px;
}

.shortcut-item {
    display: flex;
    align-items: center;
    gap: 16px;
    padding: 12px;
    background: var(--bg-secondary);
    border-radius: 8px;
}

.shortcut-item kbd {
    background: linear-gradient(135deg, #667eea 0%, #764ba2 100%);
    color: white;
    padding: 8px 16px;
    border-radius: 6px;
    font-family: 'Segoe UI', sans-serif;
    font-size: 14px;
    font-weight: 600;
    min-width: 60px;
    text-align: center;
    box-shadow: 0 4px 12px rgba(102, 126, 234, 0.3);
}

.shortcut-item span {

    /* ===================================================
       STUDY STREAK WIDGET
       =================================================== */

    .streak-widget {
        position: fixed;
        top: 80px;
        right: 20px;
        background: linear-gradient(135deg, #ff6b6b 0%, #ee5a6f 100%);
        color: white;
        padding: 16px 20px;
        border-radius: 16px;
        box-shadow: 0 8px 30px rgba(255, 107, 107, 0.3);
        display: flex;
        align-items: center;
        gap: 12px;
        z-index: 100;
        animation: slideInRight 0.5s ease;
        transition: transform 0.3s ease;
    }

    .streak-widget:hover {
        transform: translateY(-4px) scale(1.02);
        box-shadow: 0 12px 40px rgba(255, 107, 107, 0.4);
    }

    @keyframes slideInRight {
        from {
            opacity: 0;
            transform: translateX(100px);
        }
        to {
            opacity: 1;
            transform: translateX(0);
        }
    }

    .streak-icon {
        font-size: 32px;
        animation: flicker 2s infinite;
    }

    @keyframes flicker {
        0%, 100% { opacity: 1; }
        50% { opacity: 0.7; transform: scale(1.1); }
    }

    .streak-info {
        display: flex;
        flex-direction: column;
        gap: 4px;
    }

    .streak-current {
        font-size: 18px;
        font-weight: 700;
        line-height: 1;
    }

    .streak-longest {
        font-size: 12px;
        opacity: 0.9;
    }

    .btn-success {
        background: linear-gradient(135deg, #25d366 0%, #128c7e 100%);
        color: white;
        border: none;
    }

    .btn-success:hover {
        background: linear-gradient(135deg, #128c7e 0%, #075e54 100%);
        transform: translateY(-2px);
        box-shadow: 0 8px 20px rgba(37, 211, 102, 0.3);
    }

    @media (max-width: 768px) {
        .streak-widget {
            top: 70px;
            right: 10px;
            padding: 12px 16px;
            gap: 8px;
        }
    
        .streak-icon {
            font-size: 24px;
        }
    
        .streak-current {
            font-size: 14px;
        }
    
        .streak-longest {
            font-size: 11px;
        }
    }
    color: var(--text-primary);
    font-size: 15px;
}

.shortcuts-note {
    text-align: center;
    color: var(--text-secondary);
    font-size: 14px;
    margin: 16px 0 0 0;
    padding-top: 16px;
    border-top: 1px solid var(--border);
}

@media (max-width: 768px) {
    .shortcuts-content {
        padding: 24px;
    }

    .shortcuts-content h2 {
        font-size: 20px;
    }

    .shortcut-item kbd {
        min-width: 50px;
        padding: 6px 12px;
        font-size: 13px;
    }

    .shortcut-item span {
        font-size: 14px;
    }
}

/* ===================================================
   PAUSE OVERLAY
   =================================================== */

.pause-overlay {
    position: absolute;
    top: 0;
    left: 0;
    right: 0;
    bottom: 0;
    background: rgba(0, 0, 0, 0.95);
    backdrop-filter: blur(10px);
    display: flex;
    align-items: center;
    justify-content: center;
    z-index: 100;
    animation: fadeIn 0.3s ease;
}

.pause-content {
    text-align: center;
    color: white;
    max-width: 400px;
    padding: 40px;
}

.pause-content h2 {
    font-size: 32px;
    margin-bottom: 16px;
}

.pause-content p {
    font-size: 18px;
    line-height: 1.6;
    margin-bottom: 12px;
}

.pause-count {
    color: rgba(255, 255, 255, 0.6);
    font-size: 14px !important;
}

.btn-warning {
    background: linear-gradient(135deg, #ff9800 0%, #f57c00 100%);
    color: white;
}

.btn-warning:hover {
    background: linear-gradient(135deg, #f57c00 0%, #e65100 100%);
}

.btn-success {
    background: linear-gradient(135deg, #4caf50 0%, #388e3c 100%);
    color: white;
}

.btn-success:hover {
    background: linear-gradient(135deg, #388e3c 0%, #2e7d32 100%);
}

/* ===================================================
   LEADERBOARD STYLES
   =================================================== */

.leaderboard-container {
    max-width: 1200px;
    margin: 0 auto;
    padding: var(--spacing-2xl);
}

.leaderboard-header {
    display: flex;
    justify-content: space-between;
    align-items: center;
    margin-bottom: var(--spacing-2xl);
}

.leaderboard-header h2 {
    font-size: 2rem;
    color: var(--primary-dark);
    display: flex;
    align-items: center;
    gap: var(--spacing-md);
}

/* Leaderboard Tabs */
.leaderboard-tabs {
    display: flex;
    gap: var(--spacing-md);
    margin-bottom: var(--spacing-xl);
    border-bottom: 2px solid var(--border-color);
}

.tab-btn {
    padding: var(--spacing-md) var(--spacing-xl);
    background: transparent;
    border: none;
    border-bottom: 3px solid transparent;
    color: var(--text-secondary);
    font-size: 1rem;
    font-weight: 600;
    cursor: pointer;
    transition: all var(--transition-fast);
    position: relative;
    bottom: -2px;
}

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

.tab-btn.active {
    color: var(--primary);
    border-bottom-color: var(--primary);
}

/* Subject Filter */
.subject-filter {
    margin-bottom: var(--spacing-xl);
    display: flex;
    align-items: center;
    gap: var(--spacing-md);
}

.subject-filter label {
    font-weight: 600;
    color: var(--text-primary);
}

.subject-filter select {
    flex: 1;
    max-width: 300px;
}

/* User Rank Card */
.user-rank-card {
    background: linear-gradient(135deg, var(--primary) 0%, var(--primary-light) 100%);
    color: white;
    padding: var(--spacing-xl);
    border-radius: 12px;
    margin-bottom: var(--spacing-xl);
    display: flex;
    align-items: center;
    gap: var(--spacing-xl);
    box-shadow: var(--shadow-lg);
}

.rank-badge {
    background: rgba(255, 255, 255, 0.2);
    padding: var(--spacing-sm) var(--spacing-md);
    border-radius: 6px;
    font-size: 0.875rem;
    font-weight: 600;
    text-transform: uppercase;
    letter-spacing: 0.5px;
}

.rank-details {
    display: flex;
    align-items: center;
    gap: var(--spacing-xl);
    flex: 1;
}

.rank-position {
    font-size: 2rem;
    font-weight: 700;
}

.rank-score {
    font-size: 1.5rem;
    font-weight: 600;
}

.rank-streak {
    font-size: 1rem;
    opacity: 0.9;
}

/* Loading State */
.loading-state {
    text-align: center;
    padding: var(--spacing-2xl);
}

.spinner {
    width: 50px;
    height: 50px;
    border: 4px solid var(--border-color);
    border-top-color: var(--primary);
    border-radius: 50%;
    animation: spin 1s linear infinite;
    margin: 0 auto var(--spacing-md);
}

@keyframes spin {
    to { transform: rotate(360deg); }
}

/* Error State */
.error-state {
    text-align: center;
    padding: var(--spacing-2xl);
    color: var(--danger);
}

.error-state p {
    margin-bottom: var(--spacing-md);
    font-size: 1.1rem;
}

/* Empty State */
.empty-state {
    text-align: center;
    padding: var(--spacing-2xl);
    color: var(--text-secondary);
}

.empty-state p {
    font-size: 1.1rem;
}

/* Leaderboard Table */
.leaderboard-table-container {
    background: var(--bg-primary);
    border-radius: 12px;
    box-shadow: var(--shadow-md);
    overflow: hidden;
}

.leaderboard-table {
    width: 100%;
    border-collapse: collapse;
}

.leaderboard-table thead {
    background: var(--bg-secondary);
}

.leaderboard-table th {
    padding: var(--spacing-lg);
    text-align: left;
    font-weight: 600;
    color: var(--text-primary);
    font-size: 0.875rem;
    text-transform: uppercase;
    letter-spacing: 0.5px;
    border-bottom: 2px solid var(--border-color);
}

.leaderboard-table tbody tr {
    border-bottom: 1px solid var(--border-color);
    transition: background var(--transition-fast);
}

.leaderboard-table tbody tr:hover {
    background: var(--bg-secondary);
}

.leaderboard-table tbody tr.current-user {
    background: rgba(38, 61, 155, 0.1);
    font-weight: 600;
}

.leaderboard-table tbody tr.current-user:hover {
    background: rgba(38, 61, 155, 0.15);
}

.leaderboard-table td {
    padding: var(--spacing-lg);
    color: var(--text-primary);
}

/* Rank Column */
.rank-cell {
    font-weight: 700;
    color: var(--primary);
    font-size: 1.1rem;
}

.rank-cell.top-3 {
    display: flex;
    align-items: center;
    gap: var(--spacing-sm);
}

.rank-medal {
    font-size: 1.5rem;
}

/* Student Column */
.student-cell {
    display: flex;
    align-items: center;
    gap: var(--spacing-md);
}

.student-avatar {
    width: 40px;
    height: 40px;
    border-radius: 50%;
    background: var(--primary-light);
    color: white;
    display: flex;
    align-items: center;
    justify-content: center;
    font-weight: 600;
    font-size: 1rem;
}

.student-name {
    font-weight: 500;
}

/* Score Column */
.score-cell {
    font-weight: 600;
    font-size: 1.1rem;
}

.score-cell.excellent {
    color: var(--success);
}

.score-cell.good {
    color: var(--primary);
}

.score-cell.average {
    color: var(--warning);
}

/* Streak Column */
.streak-cell {
    display: flex;
    align-items: center;
    gap: var(--spacing-xs);
}

/* Time Column */
.time-cell {
    color: var(--text-secondary);
    font-size: 0.875rem;
}

/* Results Actions Grid */
.results-actions {
    display: grid;
    grid-template-columns: repeat(auto-fit, minmax(200px, 1fr));
    gap: var(--spacing-md);
    margin-top: var(--spacing-xl);
}

.results-actions .btn {
    width: 100%;
}

/* Responsive Leaderboard */
@media (max-width: 768px) {
    .leaderboard-container {
        padding: var(--spacing-lg);
    }

    .leaderboard-header {
        flex-direction: column;
        gap: var(--spacing-md);
        align-items: flex-start;
    }

    .leaderboard-header h2 {
        font-size: 1.5rem;
    }

    .leaderboard-tabs {
        width: 100%;
    }

    .tab-btn {
        flex: 1;
        padding: var(--spacing-sm) var(--spacing-md);
        font-size: 0.875rem;
    }

    .user-rank-card {
        flex-direction: column;
        align-items: flex-start;
        gap: var(--spacing-md);
    }

    .rank-details {
        flex-wrap: wrap;
        gap: var(--spacing-md);
    }

    /* Make table scrollable */
    .leaderboard-table-container {
        overflow-x: auto;
    }

    .leaderboard-table {
        min-width: 600px;
    }

    .leaderboard-table th,
    .leaderboard-table td {
        padding: var(--spacing-sm) var(--spacing-md);
        font-size: 0.875rem;
    }

    .results-actions {
        grid-template-columns: 1fr;
    }
}

/* ===================================================
   TESTIMONIALS SECTION
   =================================================== */

.testimonials-section {
    padding: var(--spacing-2xl) 0;
    background: var(--bg-secondary);
    border-radius: 16px;
    margin-bottom: var(--spacing-2xl);
}

.section-header {
    margin-bottom: var(--spacing-2xl);
}

.section-header.centered {
    text-align: center;
}

.section-subtitle {
    color: var(--text-secondary);
    font-size: 1.1rem;
    margin-top: var(--spacing-sm);
}

.testimonials-grid {
    display: grid;
    grid-template-columns: repeat(auto-fit, minmax(300px, 1fr));
    gap: var(--spacing-xl);
    padding: 0 var(--spacing-2xl);
}

.testimonial-card {
    background: white;
    border-radius: 12px;
    overflow: hidden;
    box-shadow: var(--shadow-md);
    transition: all var(--transition-normal);
}

.testimonial-card:hover {
    transform: translateY(-8px);
    box-shadow: var(--shadow-lg);
}

.testimonial-image {
    width: 100%;
    height: 200px;
    overflow: hidden;
}

.testimonial-image img {
    width: 100%;
    height: 100%;
    object-fit: cover;
}

.testimonial-content {
    padding: var(--spacing-xl);
}

.testimonial-rating {
    color: #FFA500;
    font-size: 1.2rem;
    margin-bottom: var(--spacing-md);
}

.testimonial-text {
    color: var(--text-secondary);
    font-size: 1rem;
    line-height: 1.6;
    margin-bottom: var(--spacing-lg);
    font-style: italic;
}

.testimonial-author {
    display: flex;
    flex-direction: column;
    gap: var(--spacing-xs);
}

.testimonial-author strong {
    color: var(--text-primary);
    font-size: 1.05rem;
}

.testimonial-author span {
    color: var(--text-secondary);
    font-size: 0.9rem;
}

/* ===================================================
   TRUST BADGES SECTION
   =================================================== */

.trust-section {
    margin-bottom: var(--spacing-2xl);
    padding: var(--spacing-2xl);
    background: linear-gradient(135deg, #f8f9fa 0%, #e9ecef 100%);
    border-radius: 16px;
}

.trust-badges {
    display: grid;
    grid-template-columns: repeat(auto-fit, minmax(250px, 1fr));
    gap: var(--spacing-xl);
}

.trust-badge {
    display: flex;
    align-items: center;
    gap: var(--spacing-md);
    padding: var(--spacing-lg);
    background: white;
    border-radius: 12px;
    box-shadow: var(--shadow-sm);
    transition: all var(--transition-fast);
}

.trust-badge:hover {
    box-shadow: var(--shadow-md);
    transform: translateX(5px);
}

.trust-icon {
    font-size: 2.5rem;
    flex-shrink: 0;
}

.trust-text {
    display: flex;
    flex-direction: column;
    gap: var(--spacing-xs);
}

.trust-text strong {
    color: var(--text-primary);
    font-size: 1.05rem;
}

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

/* ===================================================
   FEATURES SECTION ENHANCEMENTS
   =================================================== */

.features-section {
    margin-bottom: var(--spacing-2xl);
}

/* Responsive Testimonials */
@media (max-width: 768px) {
    .testimonials-grid {
        grid-template-columns: 1fr;
        padding: 0 var(--spacing-lg);
    }

    .trust-badges {
        grid-template-columns: 1fr;
    }

    .hero-title {
        font-size: 2.5rem;
    }

    .hero-subtitle {
        font-size: 1.1rem;
    }

    .hero-cta {
        flex-direction: column;
        width: 100%;
    }

    .btn-hero-primary,
    .btn-hero-secondary {
        width: 100%;
    }
}