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

:root {
    /* Colors */
    --primary-color: #2563eb;
    --primary-dark: #1d4ed8;
    --primary-light: #3b82f6;
    --secondary-color: #64748b;
    --success-color: #059669;
    --warning-color: #d97706;
    --danger-color: #dc2626;
    --info-color: #0891b2;
    
    /* Background Colors */
    --bg-primary: #ffffff;
    --bg-secondary: #f8fafc;
    --bg-tertiary: #f1f5f9;
    --bg-dark: #0f172a;
    
    /* Text Colors */
    --text-primary: #0f172a;
    --text-secondary: #475569;
    --text-muted: #64748b;
    --text-light: #94a3b8;
    
    /* Border Colors */
    --border-color: #e2e8f0;
    --border-light: #f1f5f9;
    
    /* Shadows */
    --shadow-sm: 0 1px 2px 0 rgb(0 0 0 / 0.05);
    --shadow-md: 0 4px 6px -1px rgb(0 0 0 / 0.1), 0 2px 4px -2px rgb(0 0 0 / 0.1);
    --shadow-lg: 0 10px 15px -3px rgb(0 0 0 / 0.1), 0 4px 6px -4px rgb(0 0 0 / 0.1);
    --shadow-xl: 0 20px 25px -5px rgb(0 0 0 / 0.1), 0 8px 10px -6px rgb(0 0 0 / 0.1);
    
    /* Border Radius */
    --radius-sm: 0.25rem;
    --radius-md: 0.5rem;
    --radius-lg: 0.75rem;
    --radius-xl: 1rem;
    
    /* Spacing */
    --spacing-xs: 0.25rem;
    --spacing-sm: 0.5rem;
    --spacing-md: 1rem;
    --spacing-lg: 1.5rem;
    --spacing-xl: 2rem;
    --spacing-2xl: 3rem;
    
    /* Typography */
    --font-family: 'Inter', -apple-system, BlinkMacSystemFont, 'Segoe UI', 'Roboto', sans-serif;
    --font-size-xs: 0.75rem;
    --font-size-sm: 0.875rem;
    --font-size-base: 1rem;
    --font-size-lg: 1.125rem;
    --font-size-xl: 1.25rem;
    --font-size-2xl: 1.5rem;
    --font-size-3xl: 1.875rem;
    --font-size-4xl: 2.25rem;
}

body {
    font-family: var(--font-family);
    font-size: var(--font-size-base);
    line-height: 1.6;
    color: var(--text-primary);
    background-color: var(--bg-secondary);
    -webkit-font-smoothing: antialiased;
    -moz-osx-font-smoothing: grayscale;
}

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

/* Header Styles */
.header {
    background: linear-gradient(135deg, var(--primary-color) 0%, var(--primary-dark) 100%);
    color: white;
    padding: var(--spacing-lg) 0;
    box-shadow: var(--shadow-lg);
}

.header-content {
    display: flex;
    justify-content: space-between;
    align-items: center;
    flex-wrap: wrap;
    gap: var(--spacing-lg);
}

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

.logo {
    width: 100px;
    height: 100px;
    border-radius: var(--radius-lg);
    object-fit: cover;
    box-shadow: var(--shadow-md);
}

.brand-text h1 {
    font-size: var(--font-size-2xl);
    font-weight: 700;
    margin-bottom: var(--spacing-xs);
}

.brand-text p {
    font-size: var(--font-size-sm);
    opacity: 0.9;
}

.header-stats {
    display: flex;
    gap: var(--spacing-xl);
}

.stat-item {
    text-align: center;
}

.stat-number {
    display: block;
    font-size: var(--font-size-2xl);
    font-weight: 700;
    line-height: 1;
}

.stat-label {
    font-size: var(--font-size-sm);
    opacity: 0.9;
}

/* Welcome Section */
.welcome-section {
    padding: var(--spacing-2xl) 0;
    text-align: center;
}

.welcome-content {
    margin-bottom: var(--spacing-xl);
}

.welcome-content h2 {
    font-size: var(--font-size-3xl);
    font-weight: 600;
    color: var(--text-primary);
    margin-bottom: var(--spacing-md);
}

.welcome-content p {
    font-size: var(--font-size-lg);
    color: var(--text-secondary);
    max-width: 600px;
    margin: 0 auto;
}

/* Search and Filter */
.search-filter {
    display: flex;
    flex-direction: column;
    align-items: center;
    gap: var(--spacing-lg);
    margin-bottom: var(--spacing-xl);
}

.search-input {
    width: 100%;
    max-width: 400px;
    padding: var(--spacing-md);
    border: 2px solid var(--border-color);
    border-radius: var(--radius-lg);
    font-size: var(--font-size-base);
    transition: all 0.3s ease;
}

.search-input:focus {
    outline: none;
    border-color: var(--primary-color);
    box-shadow: 0 0 0 3px rgb(37 99 235 / 0.1);
}

.filter-buttons {
    display: flex;
    gap: var(--spacing-sm);
    background: var(--bg-primary);
    padding: var(--spacing-sm);
    border-radius: var(--radius-lg);
    box-shadow: var(--shadow-sm);
}

.filter-btn {
    padding: var(--spacing-sm) var(--spacing-lg);
    border: none;
    background: transparent;
    color: var(--text-secondary);
    border-radius: var(--radius-md);
    font-weight: 500;
    cursor: pointer;
    transition: all 0.3s ease;
}

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

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

/* Tests Grid */
.tests-grid {
    display: grid;
    grid-template-columns: repeat(auto-fill, minmax(300px, 1fr));
    gap: var(--spacing-lg);
    padding: var(--spacing-lg) 0;
}

.test-card {
    background: var(--bg-primary);
    border-radius: var(--radius-xl);
    box-shadow: var(--shadow-md);
    overflow: hidden;
    transition: all 0.3s ease;
    cursor: pointer;
    position: relative;
}

.test-card:hover {
    transform: translateY(-4px);
    box-shadow: var(--shadow-xl);
}

.test-card.completed::before {
    content: '';
    position: absolute;
    top: 0;
    left: 0;
    right: 0;
    height: 4px;
    background: var(--success-color);
}

.test-card-header {
    padding: var(--spacing-lg);
    background: linear-gradient(135deg, var(--bg-tertiary) 0%, var(--bg-secondary) 100%);
    border-bottom: 1px solid var(--border-color);
}

.test-title {
    font-size: var(--font-size-xl);
    font-weight: 600;
    color: var(--text-primary);
    margin-bottom: var(--spacing-sm);
}

.test-meta {
    display: flex;
    justify-content: space-between;
    font-size: var(--font-size-sm);
    color: var(--text-secondary);
}

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

.test-stats {
    display: grid;
    grid-template-columns: 1fr 1fr;
    gap: var(--spacing-md);
    margin-bottom: var(--spacing-lg);
}

.stat {
    text-align: center;
}

.stat-value {
    display: block;
    font-size: var(--font-size-lg);
    font-weight: 600;
    color: var(--text-primary);
}

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

.test-card-footer {
    padding: 0 var(--spacing-lg) var(--spacing-lg);
}

.start-test-btn {
    width: 100%;
    padding: var(--spacing-md);
    background: var(--primary-color);
    color: white;
    border: none;
    border-radius: var(--radius-lg);
    font-weight: 600;
    cursor: pointer;
    transition: all 0.3s ease;
}

.start-test-btn:hover {
    background: var(--primary-dark);
    transform: translateY(-2px);
}

.start-test-btn:disabled {
    background: var(--text-muted);
    cursor: not-allowed;
    transform: none;
}

/* Quiz Styles */
.quiz-body {
    background: var(--bg-primary);
}

.quiz-header {
    background: var(--bg-primary);
    border-bottom: 1px solid var(--border-color);
    padding: var(--spacing-lg) 0;
    position: sticky;
    top: 0;
    z-index: 100;
    box-shadow: var(--shadow-sm);
}

.quiz-header-content {
    display: flex;
    justify-content: space-between;
    align-items: center;
    flex-wrap: wrap;
    gap: var(--spacing-md);
}

.quiz-info h1 {
    font-size: var(--font-size-2xl);
    font-weight: 600;
    color: var(--text-primary);
    margin-bottom: var(--spacing-xs);
}

.quiz-meta {
    font-size: var(--font-size-sm);
    color: var(--text-secondary);
}

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

.timer {
    display: flex;
    align-items: center;
    gap: var(--spacing-sm);
    padding: var(--spacing-sm) var(--spacing-md);
    background: var(--bg-secondary);
    border-radius: var(--radius-md);
    font-weight: 600;
    color: var(--text-primary);
}

.timer.warning {
    background: var(--warning-color);
    color: white;
}

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

.exit-btn {
    display: flex;
    align-items: center;
    gap: var(--spacing-sm);
    padding: var(--spacing-sm) var(--spacing-md);
    background: var(--danger-color);
    color: white;
    border: none;
    border-radius: var(--radius-md);
    font-weight: 500;
    cursor: pointer;
    transition: all 0.3s ease;
}

.exit-btn:hover {
    background: #b91c1c;
}

.progress-container {
    background: var(--bg-primary);
    padding: var(--spacing-md) 0;
    border-bottom: 1px solid var(--border-color);
    position: relative;
}

.progress-bar {
    height: 4px;
    background: var(--bg-tertiary);
    border-radius: var(--radius-sm);
    overflow: hidden;
    margin-bottom: var(--spacing-md);
}

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

.questions-progress {
    display: flex;
    justify-content: center;
    gap: var(--spacing-sm);
    flex-wrap: wrap;
}

.progress-dot {
    width: 32px;
    height: 32px;
    border-radius: 50%;
    background: var(--bg-tertiary);
    border: 2px solid var(--border-color);
    display: flex;
    align-items: center;
    justify-content: center;
    font-size: var(--font-size-sm);
    font-weight: 600;
    color: var(--text-secondary);
    cursor: pointer;
    transition: all 0.3s ease;
}

.progress-dot:hover {
    transform: scale(1.1);
}

.progress-dot.current {
    background: var(--primary-color);
    border-color: var(--primary-color);
    color: white;
    transform: scale(1.2);
}

.progress-dot.answered:not(.current) {
    background: #fbbf24;
    border-color: #f59e0b;
    color: white;
}

.progress-dot.answered.reviewed {
    background: var(--success-color);
    border-color: var(--success-color);
    color: white;
}

.progress-dot.answered.incorrect {
    background: var(--danger-color);
    border-color: var(--danger-color);
    color: white;
}

/* Question Card */
.quiz-main {
    padding: var(--spacing-2xl) 0;
    min-height: calc(100vh - 200px);
}

.quiz-container {
    max-width: 800px;
    margin: 0 auto;
}

.question-card {
    background: var(--bg-primary);
    border-radius: var(--radius-xl);
    box-shadow: var(--shadow-lg);
    overflow: hidden;
    margin-bottom: var(--spacing-xl);
}

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

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

.question-image-container {
    text-align: center;
    margin: var(--spacing-xl) 0;
}

.question-image {
    max-width: 100%;
    height: auto;
    border-radius: var(--radius-lg);
    box-shadow: var(--shadow-md);
}

/* Answers */
.answers-container {
    padding: 0 var(--spacing-2xl) var(--spacing-2xl);
}

.answer-option {
    background: var(--bg-secondary);
    border: 2px solid var(--border-color);
    border-radius: var(--radius-lg);
    padding: var(--spacing-lg);
    margin-bottom: var(--spacing-md);
    cursor: pointer;
    transition: all 0.3s ease;
    position: relative;
    display: flex;
    align-items: center;
    gap: var(--spacing-md);
}

.answer-option:hover {
    border-color: var(--primary-color);
    background: var(--bg-primary);
    transform: translateX(4px);
}

.answer-option.selected {
    border-color: var(--primary-color);
    background: var(--primary-color);
    color: white;
}

.answer-option.correct {
    border-color: var(--success-color);
    background: var(--success-color);
    color: white;
}

.answer-option.incorrect {
    border-color: var(--danger-color);
    background: var(--danger-color);
    color: white;
}

.answer-letter {
    width: 32px;
    height: 32px;
    border-radius: 50%;
    background: var(--bg-primary);
    color: var(--text-primary);
    display: flex;
    align-items: center;
    justify-content: center;
    font-weight: 600;
    flex-shrink: 0;
}

.answer-option.selected .answer-letter {
    background: white;
    color: var(--primary-color);
}

.answer-option.correct .answer-letter {
    background: white;
    color: var(--success-color);
}

.answer-option.incorrect .answer-letter {
    background: white;
    color: var(--danger-color);
}

.answer-text {
    flex: 1;
    font-size: var(--font-size-base);
    line-height: 1.6;
}

/* Navigation */
.quiz-navigation {
    display: flex;
    justify-content: space-between;
    align-items: center;
    gap: var(--spacing-md);
    padding: var(--spacing-xl) 0;
}

.nav-btn {
    display: flex;
    align-items: center;
    gap: var(--spacing-sm);
    padding: var(--spacing-md) var(--spacing-lg);
    border: 2px solid var(--border-color);
    background: var(--bg-primary);
    color: var(--text-primary);
    border-radius: var(--radius-lg);
    font-weight: 600;
    cursor: pointer;
    transition: all 0.3s ease;
    min-width: 120px;
    justify-content: center;
}

.nav-btn:hover:not(:disabled) {
    border-color: var(--primary-color);
    background: var(--primary-color);
    color: white;
    transform: translateY(-2px);
}

.nav-btn:disabled {
    opacity: 0.5;
    cursor: not-allowed;
    transform: none;
}

.next-btn,
.submit-btn {
    background: var(--primary-color);
    border-color: var(--primary-color);
    color: white;
}

.next-btn:hover,
.submit-btn:hover {
    background: var(--primary-dark);
    border-color: var(--primary-dark);
}

.submit-btn {
    background: var(--success-color);
    border-color: var(--success-color);
}

.submit-btn:hover {
    background: #047857;
    border-color: #047857;
}

.nav-center {
    flex: 1;
    display: flex;
    justify-content: center;
}

.questions-btn {
    background: var(--bg-secondary);
    border-color: var(--border-color);
}

/* Modal Styles */
.modal {
    display: none;
    position: fixed;
    top: 0;
    left: 0;
    width: 100%;
    height: 100%;
    background: rgba(0, 0, 0, 0.5);
    z-index: 1000;
    backdrop-filter: blur(4px);
}

.modal.active {
    display: flex;
    align-items: center;
    justify-content: center;
    animation: fadeIn 0.3s ease;
}

.modal-content {
    background: var(--bg-primary);
    border-radius: var(--radius-xl);
    box-shadow: var(--shadow-xl);
    min-width: 400px;
    max-width: 500px;
    overflow-y: auto;
    animation: slideIn 0.3s ease;
}

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

.modal-header h3 {
    font-size: var(--font-size-xl);
    font-weight: 600;
    color: var(--text-primary);
}

.modal-close {
    background: none;
    border: none;
    font-size: var(--font-size-2xl);
    color: var(--text-secondary);
    cursor: pointer;
    padding: var(--spacing-sm);
    border-radius: var(--radius-md);
    transition: all 0.3s ease;
}

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

.modal-body {
    padding: var(--spacing-xl);
}

.modal-actions {
    display: flex;
    justify-content: flex-end;
    gap: var(--spacing-md);
    margin-top: var(--spacing-xl);
}

.modal-actions .btn {
    min-width: 140px;
}

/* Questions Overview */
.questions-overview {
    display: grid;
    grid-template-columns: repeat(auto-fill, minmax(60px, 1fr));
    gap: var(--spacing-md);
    padding: var(--spacing-md);
}

.question-overview-item {
    aspect-ratio: 1;
    border: 2px solid var(--border-color);
    border-radius: var(--radius-md);
    display: flex;
    align-items: center;
    justify-content: center;
    font-weight: 600;
    cursor: pointer;
    transition: all 0.3s ease;
    background: var(--bg-secondary);
}

.question-overview-item:hover {
    transform: scale(1.05);
}

.question-overview-item.current {
    border-color: var(--primary-color);
    background: var(--primary-color);
    color: white;
}

.question-overview-item.answered {
    background: #fbbf24;
    border-color: #f59e0b;
    color: white;
}

/* Button Styles */
.btn {
    display: inline-flex;
    align-items: center;
    justify-content: center;
    gap: var(--spacing-sm);
    padding: var(--spacing-md) var(--spacing-lg);
    border: 2px solid transparent;
    border-radius: var(--radius-lg);
    font-weight: 600;
    text-decoration: none;
    cursor: pointer;
    transition: all 0.3s ease;
    font-size: var(--font-size-base);
}

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

.btn-primary:hover {
    background: var(--primary-dark);
    transform: translateY(-2px);
}

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

.btn-secondary:hover {
    background: var(--bg-tertiary);
    border-color: var(--text-secondary);
}

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

.btn-danger:hover {
    background: #b91c1c;
}

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

.btn-outline:hover {
    background: var(--bg-secondary);
    border-color: var(--text-secondary);
}

/* Loading Spinner */
.loading-spinner {
    display: flex;
    flex-direction: column;
    align-items: center;
    justify-content: center;
    padding: var(--spacing-2xl);
    color: var(--text-secondary);
}

.spinner {
    width: 40px;
    height: 40px;
    border: 4px solid var(--bg-tertiary);
    border-top: 4px solid var(--primary-color);
    border-radius: 50%;
    animation: spin 1s linear infinite;
    margin-bottom: var(--spacing-md);
}

/* Footer */
.footer {
    background: var(--bg-dark);
    color: white;
    padding: var(--spacing-xl) 0;
    text-align: center;
    margin-top: auto;
}

/* Notification styles */
.notification {
    position: fixed;
    top: var(--spacing-md);
    left: var(--spacing-md);
    right: var(--spacing-md);
    background: var(--bg-primary);
    border-radius: var(--radius-lg);
    box-shadow: var(--shadow-xl);
    z-index: 9999;
    transform: translateY(-100%);
    transition: transform 0.3s ease;
}

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

.notification-content {
    display: flex;
    align-items: center;
    justify-content: space-between;
    padding: var(--spacing-md);
    gap: var(--spacing-md);
}

.notification-message {
    flex: 1;
    font-weight: 500;
}

.notification-close {
    background: none;
    border: none;
    font-size: var(--font-size-xl);
    cursor: pointer;
    padding: var(--spacing-xs);
    border-radius: var(--radius-sm);
    color: var(--text-secondary);
    min-width: 44px;
    min-height: 44px;
}

.notification-success {
    border-left: 4px solid var(--success-color);
}

.notification-error {
    border-left: 4px solid var(--danger-color);
}

.notification-warning {
    border-left: 4px solid var(--warning-color);
}

.notification-info {
    border-left: 4px solid var(--info-color);
}

/* Empty state styles */
.empty-state,
.error-state {
    display: flex;
    align-items: center;
    justify-content: center;
    min-height: 300px;
    text-align: center;
    padding: var(--spacing-2xl);
}

.empty-state-content,
.error-state-content {
    max-width: 400px;
}

.empty-state-icon,
.error-state-icon {
    margin-bottom: var(--spacing-lg);
    color: var(--text-muted);
}

.empty-state h3,
.error-state h3 {
    font-size: var(--font-size-xl);
    margin-bottom: var(--spacing-md);
    color: var(--text-primary);
}

.empty-state p,
.error-state p {
    font-size: var(--font-size-base);
    color: var(--text-secondary);
    margin-bottom: var(--spacing-lg);
}

/* Results Page Styles */
.results-body {
    background: var(--bg-secondary);
}

.results-header {
    background: linear-gradient(135deg, var(--primary-color) 0%, var(--primary-dark) 100%);
    color: white;
    padding: var(--spacing-lg) 0;
    box-shadow: var(--shadow-lg);
}

.results-header-content {
    display: flex;
    justify-content: space-between;
    align-items: center;
    flex-wrap: wrap;
    gap: var(--spacing-lg);
}

.results-main {
    padding: var(--spacing-2xl) 0;
}

/* Score Summary */
.score-summary {
    margin-bottom: var(--spacing-2xl);
}

.score-card {
    background: var(--bg-primary);
    border-radius: var(--radius-xl);
    box-shadow: var(--shadow-lg);
    padding: var(--spacing-2xl);
    text-align: center;
    position: relative;
    overflow: hidden;
}

.score-card::before {
    content: '';
    position: absolute;
    top: 0;
    left: 0;
    right: 0;
    height: 4px;
}

.score-card.success::before {
    background: var(--success-color);
}

.score-card.fail::before {
    background: var(--danger-color);
}

.score-icon {
    margin-bottom: var(--spacing-lg);
}

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

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

.score-content h2 {
    font-size: var(--font-size-2xl);
    font-weight: 600;
    margin-bottom: var(--spacing-xl);
    color: var(--text-primary);
}

.score-details {
    display: grid;
    grid-template-columns: repeat(auto-fit, minmax(200px, 1fr));
    gap: var(--spacing-lg);
    margin-top: var(--spacing-xl);
}

.score-item {
    text-align: center;
}

.score-label {
    display: block;
    font-size: var(--font-size-sm);
    color: var(--text-secondary);
    margin-bottom: var(--spacing-xs);
    font-weight: 500;
}

.score-value {
    display: block;
    font-size: var(--font-size-2xl);
    font-weight: 700;
    color: var(--text-primary);
}

.score-value.correct {
    color: var(--success-color);
}

.score-value.incorrect {
    color: var(--danger-color);
}

/* Filter Tabs */
.results-filters {
    margin-bottom: var(--spacing-2xl);
}

.filter-tabs {
    display: flex;
    background: var(--bg-primary);
    border-radius: var(--radius-lg);
    padding: var(--spacing-sm);
    box-shadow: var(--shadow-sm);
    gap: var(--spacing-xs);
    overflow-x: auto;
}

.filter-tab {
    padding: var(--spacing-md) var(--spacing-lg);
    border: none;
    background: transparent;
    color: var(--text-secondary);
    border-radius: var(--radius-md);
    font-weight: 500;
    cursor: pointer;
    transition: all 0.3s ease;
    white-space: nowrap;
    flex-shrink: 0;
}

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

.filter-tab.active {
    background: var(--primary-color);
    color: white;
}

/* Results List */
.results-list {
    display: flex;
    flex-direction: column;
    gap: var(--spacing-lg);
}

.result-card {
    background: var(--bg-primary);
    border-radius: var(--radius-xl);
    box-shadow: var(--shadow-md);
    overflow: hidden;
    transition: all 0.3s ease;
    border-left: 4px solid transparent;
}

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

.result-card.incorrect {
    border-left-color: var(--danger-color);
}

.result-card.unanswered {
    border-left-color: var(--warning-color);
}

.result-card:hover {
    transform: translateY(-2px);
    box-shadow: var(--shadow-lg);
}

.result-card-header {
    padding: var(--spacing-lg);
    background: var(--bg-secondary);
    border-bottom: 1px solid var(--border-color);
}

.question-number {
    display: flex;
    justify-content: space-between;
    align-items: center;
    flex-wrap: wrap;
    gap: var(--spacing-md);
}

.question-number span {
    font-weight: 600;
    color: var(--text-primary);
}

.status-badge {
    display: flex;
    align-items: center;
    gap: var(--spacing-xs);
    padding: var(--spacing-xs) var(--spacing-md);
    border-radius: var(--radius-md);
    font-size: var(--font-size-sm);
    font-weight: 500;
}

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

.status-badge.incorrect {
    background: var(--danger-color);
    color: white;
}

.status-badge.unanswered {
    background: var(--warning-color);
    color: white;
}

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

/* Answers Review */
.answers-review {
    display: flex;
    flex-direction: column;
    gap: var(--spacing-md);
}

.answer-review {
    display: flex;
    align-items: center;
    gap: var(--spacing-md);
    padding: var(--spacing-md);
    border-radius: var(--radius-lg);
    border: 2px solid var(--border-color);
    background: var(--bg-secondary);
    transition: all 0.3s ease;
}

.answer-review.correct-answer {
    border-color: var(--success-color);
    background: rgba(5, 150, 105, 0.1);
}

.answer-review.wrong-answer {
    border-color: var(--danger-color);
    background: rgba(220, 38, 38, 0.1);
}

.answer-review.user-selected {
    font-weight: 600;
}

.answer-status {
    flex-shrink: 0;
    color: var(--text-secondary);
}

.answer-review.correct-answer .answer-status {
    color: var(--success-color);
}

.answer-review.wrong-answer .answer-status {
    color: var(--danger-color);
}

/* Action Buttons */
.results-actions {
    margin-top: var(--spacing-2xl);
    padding-top: var(--spacing-2xl);
    border-top: 1px solid var(--border-color);
}

.action-buttons {
    display: flex;
    justify-content: center;
    gap: var(--spacing-lg);
    flex-wrap: wrap;
}

/* Submit Modal Styles */
.submit-warning {
    display: flex;
    align-items: flex-start;
    gap: var(--spacing-lg);
    margin-bottom: var(--spacing-xl);
}

.warning-icon {
    color: var(--warning-color);
    flex-shrink: 0;
}

.warning-content {
    flex: 1;
}

.warning-content p {
    font-size: var(--font-size-lg);
    color: var(--text-primary);
    margin-bottom: var(--spacing-lg);
}

.unanswered-info {
    background: rgba(217, 119, 6, 0.1);
    border: 1px solid var(--warning-color);
    border-radius: var(--radius-lg);
    padding: var(--spacing-lg);
    margin-top: var(--spacing-md);
}

.unanswered-details {
    display: flex;
    align-items: center;
    gap: var(--spacing-sm);
    margin-bottom: var(--spacing-sm);
}

.unanswered-count {
    background: var(--warning-color);
    color: white;
    width: 32px;
    height: 32px;
    border-radius: 50%;
    display: flex;
    align-items: center;
    justify-content: center;
    font-weight: 700;
    font-size: var(--font-size-lg);
}

.unanswered-text {
    font-weight: 600;
    color: var(--warning-color);
}

.unanswered-warning {
    font-size: var(--font-size-sm);
    color: var(--text-secondary);
    margin: 0;
}

/* Results Page Title Styles */
.results-title-section {
    text-align: center;
}

.results-title-section h1 {
    font-size: var(--font-size-2xl);
    font-weight: 600;
    margin-bottom: var(--spacing-xs);
}

.test-title {
    font-size: var(--font-size-lg);
    font-weight: 500;
    opacity: 0.9;
    margin: 0;
}

/* Test Info for Print */
.test-info-print {
    display: none;
    margin-bottom: var(--spacing-2xl);
}

.test-info-card {
    background: var(--bg-primary);
    border: 2px solid var(--border-color);
    border-radius: var(--radius-lg);
    padding: var(--spacing-xl);
    text-align: center;
}

.test-info-card h2 {
    font-size: var(--font-size-2xl);
    font-weight: 600;
    color: var(--text-primary);
    margin-bottom: var(--spacing-md);
}

.test-details {
    font-size: var(--font-size-sm);
    color: var(--text-secondary);
}

/* Empty Results State */
.empty-results-state {
    display: flex;
    align-items: center;
    justify-content: center;
    min-height: 300px;
    text-align: center;
    padding: var(--spacing-2xl);
}

.empty-results-content {
    max-width: 400px;
}

.empty-results-icon {
    margin-bottom: var(--spacing-lg);
    color: var(--text-muted);
}

.empty-results-content h3 {
    font-size: var(--font-size-xl);
    margin-bottom: var(--spacing-md);
    color: var(--text-primary);
}

.empty-results-content p {
    font-size: var(--font-size-base);
    color: var(--text-secondary);
}

/* ========================================
   MOBILE STYLES
   ======================================== */

@media (max-width: 768px) {
    .container {
        padding: 0 var(--spacing-sm);
    }
    
    /* Header adjustments */
    .header {
        padding: var(--spacing-md) 0;
    }
    
    .header-content {
        flex-direction: column;
        text-align: center;
        gap: var(--spacing-md);
    }
    
    .logo {
        width: 50px;
        height: 50px;
    }
    
    .brand-text h1 {
        font-size: var(--font-size-xl);
    }
    
    /* Welcome section mobile */
    .welcome-section {
        padding: var(--spacing-xl) 0;
    }
    
    .welcome-content h2 {
        font-size: var(--font-size-2xl);
    }
    
    .welcome-content p {
        font-size: var(--font-size-base);
    }
    
    /* Test cards mobile */
    .tests-grid {
        grid-template-columns: 1fr;
        gap: var(--spacing-md);
    }
    
    .test-card-header,
    .test-card-body,
    .test-card-footer {
        padding: var(--spacing-md);
    }
    
    .test-title {
        font-size: var(--font-size-lg);
    }
    
    /* Quiz header mobile */
    .quiz-header {
        padding: var(--spacing-md) 0;
    }
    
    .quiz-header-content {
        flex-direction: column;
        gap: var(--spacing-md);
        text-align: center;
    }
    
    .quiz-info h1 {
        font-size: var(--font-size-xl);
    }
    
    .quiz-controls {
        gap: var(--spacing-md);
        justify-content: center;
    }
    
    .timer {
        padding: var(--spacing-xs) var(--spacing-sm);
        font-size: var(--font-size-sm);
    }
    
    .exit-btn {
        padding: var(--spacing-xs) var(--spacing-sm);
        font-size: var(--font-size-sm);
    }
    
    /* Progress container - NOT sticky on mobile */
    .progress-container {
        padding: var(--spacing-md) 0;
        background: var(--bg-primary);
        box-shadow: var(--shadow-sm);
        position: relative;
    }
    
    .progress-bar {
        margin-bottom: var(--spacing-lg);
    }
    
    .questions-progress {
        display: grid;
        grid-template-columns: repeat(10, 1fr);
        grid-template-rows: repeat(2, 1fr);
        gap: var(--spacing-xs);
        padding: 0 var(--spacing-sm);
        max-width: 100%;
        overflow: visible;
    }
    
    .progress-dot {
        width: 30px;
        height: 30px;
        font-size: var(--font-size-xs);
        margin: 0;
    }
    
    .progress-dot.current {
        transform: scale(1.15);
        box-shadow: 0 0 0 3px rgba(37, 99, 235, 0.2);
        z-index: 2;
    }
    
    /* Question card mobile */
    .quiz-main {
        padding: var(--spacing-lg) 0;
        padding-bottom: 100px;
    }
    
    .question-content {
        padding: var(--spacing-lg);
    }
    
    .question-text {
        font-size: var(--font-size-lg);
        line-height: 1.6;
    }
    
    /* Answers mobile */
    .answers-container {
        padding: 0 var(--spacing-lg) var(--spacing-lg);
    }
    
    .answer-option {
        padding: var(--spacing-lg);
        margin-bottom: var(--spacing-md);
        min-height: 64px;
        -webkit-user-select: none;
        -moz-user-select: none;
        -ms-user-select: none;
        user-select: none;
        touch-action: manipulation;
    }
    
    .answer-option:active {
        transform: scale(0.98);
    }
    
    .answer-letter {
        width: 36px;
        height: 36px;
        font-size: var(--font-size-base);
    }
    
    .answer-text {
        font-size: var(--font-size-base);
        line-height: 1.5;
    }
    
    /* Mobile Navigation - Fixed Bottom with Arrows */
    .quiz-navigation {
        display: flex;
        flex-direction: row;
        justify-content: space-between;
        align-items: center;
        gap: var(--spacing-md);
        padding: var(--spacing-md);
        position: fixed;
        bottom: 0;
        left: 0;
        right: 0;
        background: var(--bg-primary);
        border-top: 1px solid var(--border-color);
        box-shadow: 0 -2px 10px rgba(0, 0, 0, 0.1);
        z-index: 100;
    }
    
    /* Arrow navigation buttons for mobile */
    .prev-btn,
    .next-btn {
        border: 2px solid var(--border-color);
        background: var(--bg-primary);
        color: var(--text-primary);
        border-radius: 50%;
        width: 56px;
        height: 56px;
        padding: 0;
        min-width: auto;
        flex-shrink: 0;
    }
    
    .prev-btn span,
    .next-btn span {
        display: none;
    }
    
    .prev-btn svg,
    .next-btn svg {
        width: 24px;
        height: 24px;
    }
    
    .nav-btn:hover:not(:disabled) {
        transform: scale(1.1);
    }
    
    .nav-btn:active:not(:disabled) {
        transform: scale(0.95);
    }
    
    .nav-btn:disabled {
        opacity: 0.3;
    }
    
    .nav-center {
        flex: 1;
        display: flex;
        justify-content: center;
        order: 0;
    }
    
    .questions-btn,
    .submit-btn {
        width: auto;
        height: 48px;
        border-radius: var(--radius-lg);
        padding: 0 var(--spacing-xl);
        min-width: 140px;
    }
    
    .questions-btn:hover,
    .submit-btn:hover {
        transform: translateY(-2px);
    }
    
    /* Modals mobile */
    .modal-content {
        margin: var(--spacing-md);
        max-width: calc(100vw - 2rem);
        max-height: calc(100vh - 2rem);
        min-width: auto;
        width: calc(100vw - 2rem);
    }
    
    .modal-header,
    .modal-body {
        padding: var(--spacing-lg);
    }
    
    .modal-header h3 {
        font-size: var(--font-size-xl);
    }
    
    .questions-overview {
        grid-template-columns: repeat(5, 1fr);
        gap: var(--spacing-md);
        padding: var(--spacing-md);
    }
    
    .question-overview-item {
        width: 48px;
        height: 48px;
        font-size: var(--font-size-base);
    }
    
    .modal-actions {
        flex-direction: column;
    }
    
    .modal-actions .btn {
        width: 100%;
        min-width: auto;
    }
    
    .submit-warning {
        flex-direction: column;
        text-align: center;
        gap: var(--spacing-md);
    }
    
    .warning-content p {
        font-size: var(--font-size-base);
    }
    
    /* Results mobile */
    .results-header-content {
        flex-direction: column;
        text-align: center;
        gap: var(--spacing-md);
    }
    
    .results-title-section h1 {
        font-size: var(--font-size-xl);
    }
    
    .test-title {
        font-size: var(--font-size-base);
    }
    
    .score-details {
        grid-template-columns: 1fr 1fr;
        gap: var(--spacing-md);
    }
    
    .filter-tabs {
        justify-content: flex-start;
    }
    
    .question-number {
        flex-direction: column;
        align-items: flex-start;
        gap: var(--spacing-sm);
    }
    
    .action-buttons {
        flex-direction: column;
        align-items: stretch;
    }
    
    .answer-review {
        flex-direction: column;
        align-items: flex-start;
        gap: var(--spacing-sm);
    }
    
    /* Buttons mobile */
    .btn {
        padding: var(--spacing-md) var(--spacing-lg);
        font-size: var(--font-size-base);
        min-height: 48px;
        touch-action: manipulation;
    }
    
    /* Mobile-specific animations */
    .test-card:active {
        transform: scale(0.98);
    }
    
    .nav-btn:active {
        transform: scale(0.98);
    }
}

/* Small mobile screens */
@media (max-width: 480px) {
    .container {
        padding: 0 var(--spacing-xs);
    }
    
    .questions-progress {
        grid-template-columns: repeat(5, 1fr);
        grid-template-rows: repeat(4, 1fr);
    }
    
    .progress-dot {
        width: 28px;
        height: 28px;
        font-size: 10px;
    }
    
    .nav-btn {
        width: 48px;
        height: 48px;
    }
    
    .prev-btn svg,
    .next-btn svg {
        width: 20px;
        height: 20px;
    }
    
    .questions-btn,
    .submit-btn {
        min-width: 120px;
        height: 44px;
        font-size: var(--font-size-sm);
        padding: 0 var(--spacing-lg);
    }
    
    .score-details {
        grid-template-columns: 1fr;
    }
    
    .filter-tabs {
        flex-direction: column;
    }
    
    .filter-tab {
        text-align: center;
    }
    
    .questions-overview {
        grid-template-columns: repeat(4, 1fr);
    }
    
    .question-overview-item {
        width: 44px;
        height: 44px;
        font-size: var(--font-size-sm);
    }
}

/* Landscape mobile optimization */
@media (max-width: 768px) and (orientation: landscape) {
    .quiz-header {
        padding: var(--spacing-sm) 0;
    }
    
    .quiz-main {
        padding: var(--spacing-md) 0;
    }
    
    .question-content {
        padding: var(--spacing-md);
    }
    
    .questions-progress {
        grid-template-columns: repeat(20, 1fr);
        grid-template-rows: 1fr;
        gap: var(--spacing-xs);
        overflow-x: auto;
        overflow-y: hidden;
        padding: var(--spacing-sm) var(--spacing-md);
        scrollbar-width: none;
        -ms-overflow-style: none;
    }
    
    .questions-progress::-webkit-scrollbar {
        display: none;
    }
    
    .progress-dot {
        width: 28px;
        height: 28px;
        font-size: 10px;
        flex-shrink: 0;
    }
    
    .quiz-navigation {
        padding: var(--spacing-sm) var(--spacing-md);
    }
    
    .nav-btn {
        width: 48px;
        height: 48px;
    }
}

/* Desktop styles remain unchanged */
@media (min-width: 769px) {
    /* Show text on desktop for navigation buttons */
    .prev-btn span,
    .next-btn span {
        display: inline;
    }
}

/* Touch device optimizations */
@media (pointer: coarse) {
    .answer-option {
        min-height: 60px;
    }
    
    .progress-dot {
        min-width: 32px;
        min-height: 32px;
    }
    
    .nav-btn {
        min-height: 52px;
    }
    
    .btn {
        min-height: 48px;
    }
}

/* Print Styles */
@media print {
    .header,
    .quiz-header,
    .quiz-navigation,
    .modal,
    .results-actions,
    .results-header,
    .results-filters {
        display: none !important;
    }
    
    .test-info-print {
        display: block !important;
        break-inside: avoid;
    }
    
    .results-main {
        padding: 0 !important;
    }
    
    .result-card {
        break-inside: avoid;
        box-shadow: none !important;
        border: 1px solid var(--border-color) !important;
        margin-bottom: var(--spacing-md) !important;
    }
    
    .question-card,
    .score-card {
        break-inside: avoid;
        box-shadow: none !important;
        border: 1px solid var(--border-color) !important;
    }
    
    .test-info-card {
        break-inside: avoid;
        page-break-after: avoid;
    }
    
    /* Ensure good print quality */
    * {
        -webkit-print-color-adjust: exact !important;
        color-adjust: exact !important;
        print-color-adjust: exact !important;
    }
}

/* Dark mode support */
@media (prefers-color-scheme: dark) {
    :root {
        --bg-primary: #1e293b;
        --bg-secondary: #0f172a;
        --bg-tertiary: #334155;
        --text-primary: #f8fafc;
        --text-secondary: #cbd5e1;
        --text-muted: #94a3b8;
        --border-color: #334155;
    }
}

/* Animations */
@keyframes fadeIn {
    from { opacity: 0; }
    to { opacity: 1; }
}

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

@keyframes spin {
    0% { transform: rotate(0deg); }
    100% { transform: rotate(360deg); }
}

@keyframes mobilePulse {
    0%, 100% {
        box-shadow: 0 0 0 3px rgba(37, 99, 235, 0.2);
    }
    50% {
        box-shadow: 0 0 0 6px rgba(37, 99, 235, 0.1);
    }
}

/* Mobile Navigation - Fixed Bottom with Arrows */
@media (max-width: 768px) {
    .quiz-navigation {
        display: flex;
        flex-direction: row;
        justify-content: space-between;
        align-items: center;
        gap: var(--spacing-md);
        padding: var(--spacing-md);
        position: fixed;
        bottom: 0;
        left: 0;
        right: 0;
        background: var(--bg-primary);
        border-top: 1px solid var(--border-color);
        box-shadow: 0 -2px 10px rgba(0, 0, 0, 0.1);
        z-index: 100;
    }
    
    /* Arrow navigation buttons for mobile - ONLY ICONS */
    .prev-btn,
    .next-btn {
        border: 2px solid var(--border-color);
        background: var(--bg-primary);
        color: var(--text-primary);
        border-radius: 50%;
        width: 56px;
        height: 56px;
        padding: 0;
        min-width: 56px;
        flex-shrink: 0;
        display: flex;
        align-items: center;
        justify-content: center;
    }
    
    /* IMPORTANT: Hide text on mobile for prev/next buttons */
    .prev-btn span,
    .next-btn span {
        display: none !important;
    }
    
    /* Make sure SVG icons are visible and centered */
    .prev-btn svg,
    .next-btn svg {
        width: 24px;
        height: 24px;
        flex-shrink: 0;
    }
    
    .nav-btn:hover:not(:disabled) {
        border-color: var(--primary-color);
        background: var(--primary-color);
        color: white;
        transform: scale(1.1);
    }
    
    .nav-btn:active:not(:disabled) {
        transform: scale(0.95);
    }
    
    .nav-btn:disabled {
        opacity: 0.3;
        cursor: not-allowed;
        transform: none;
    }
    
    /* Center section with questions/submit button */
    .nav-center {
        flex: 1;
        display: flex;
        justify-content: center;
        order: 0;
    }
    
    .questions-btn,
    .submit-btn {
        background: var(--bg-secondary);
        border-color: var(--border-color);
        color: var(--text-primary);
        width: auto;
        height: 48px;
        border-radius: var(--radius-lg);
        padding: 0 var(--spacing-xl);
        min-width: 140px;
        display: flex;
        align-items: center;
        justify-content: center;
        gap: var(--spacing-sm);
        font-size: var(--font-size-base);
        font-weight: 600;
    }
    
    .questions-btn:hover {
        background: var(--bg-tertiary);
        border-color: var(--primary-color);
        transform: translateY(-2px);
    }
    
    .questions-btn svg {
        width: 20px;
        height: 20px;
    }
    
    /* Submit button - special style */
    .submit-btn {
        background: var(--success-color);
        border-color: var(--success-color);
        color: white;
    }
    
    .submit-btn:hover {
        background: #047857;
        border-color: #047857;
        transform: translateY(-2px);
    }
    
    .submit-btn svg {
        width: 20px;
        height: 20px;
    }
}