/* Reset et variables CSS */
:root {
    --primary-color: #2563eb;
    --primary-hover: #1d4ed8;
    --secondary-color: #64748b;
    --success-color: #059669;
    --error-color: #dc2626;
    --warning-color: #d97706;
    --background: #f8fafc;
    --surface: #ffffff;
    --text-primary: #1e293b;
    --text-secondary: #64748b;
    --border-color: #e2e8f0;
    --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);
    --radius: 0.5rem;
    --radius-lg: 0.75rem;
}

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

body {
    font-family: 'Inter', -apple-system, BlinkMacSystemFont, 'Segoe UI', sans-serif;
    background: linear-gradient(135deg, var(--background) 0%, #e2e8f0 100%);
    color: var(--text-primary);
    line-height: 1.6;
    min-height: 100vh;
}

.app-container {
    min-height: 100vh;
    display: flex;
    flex-direction: column;
}

/* Utilitaires */
.hidden {
    display: none !important;
}

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

.text-error {
    color: var(--error-color);
}

.text-warning {
    color: var(--warning-color);
}

/* Header */
.header {
    background: var(--surface);
    border-bottom: 1px solid var(--border-color);
    box-shadow: var(--shadow-sm);
    padding: 1rem 0;
    position: sticky;
    top: 0;
    z-index: 100;
}

.header-content {
    max-width: 1200px;
    margin: 0 auto;
    padding: 0 2rem;
    display: flex;
    justify-content: space-between;
    align-items: center;
}

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

.logo i {
    font-size: 2rem;
    color: var(--primary-color);
}

.logo h1 {
    font-size: 1.75rem;
    font-weight: 700;
    color: var(--text-primary);
}

.header-info {
    display: flex;
    align-items: center;
    gap: 2rem;
}

.header-actions {
    display: flex;
    align-items: center;
    gap: 1rem;
}

.exam-type {
    font-weight: 500;
    color: var(--text-secondary);
    font-size: 0.9rem;
}

.timer {
    display: flex;
    align-items: center;
    gap: 0.5rem;
    background: var(--background);
    padding: 0.5rem 1rem;
    border-radius: var(--radius);
    border: 1px solid var(--border-color);
    font-weight: 500;
    color: var(--text-primary);
}

.timer i {
    color: var(--primary-color);
}

/* Écrans */
.start-screen,
.exam-screen,
.results-screen {
    flex: 1;
    display: flex;
    align-items: center;
    justify-content: center;
    padding: 2rem;
}

.start-content {
    max-width: 600px;
    width: 100%;
}

.welcome-card {
    background: var(--surface);
    border-radius: var(--radius-lg);
    padding: 3rem;
    box-shadow: var(--shadow-lg);
    text-align: center;
    border: 1px solid var(--border-color);
}

.icon-container {
    width: 4rem;
    height: 4rem;
    background: linear-gradient(135deg, var(--primary-color), var(--primary-hover));
    border-radius: 50%;
    display: flex;
    align-items: center;
    justify-content: center;
    margin: 0 auto 2rem;
}

.icon-container i {
    color: white;
    font-size: 1.5rem;
}

.welcome-card h2 {
    font-size: 2rem;
    margin-bottom: 1rem;
    color: var(--text-primary);
}

.description {
    color: var(--text-secondary);
    margin-bottom: 2rem;
    font-size: 1.1rem;
}

.exam-info {
    display: grid;
    grid-template-columns: repeat(auto-fit, minmax(150px, 1fr));
    gap: 1rem;
    margin-bottom: 2rem;
    padding: 1.5rem;
    background: var(--background);
    border-radius: var(--radius);
    border: 1px solid var(--border-color);
}

.info-item {
    display: flex;
    align-items: center;
    gap: 0.5rem;
    justify-content: center;
    text-align: center;
}

.info-item i {
    color: var(--primary-color);
    font-size: 1.1rem;
}

.info-item span {
    font-weight: 500;
    color: var(--text-primary);
    font-size: 0.9rem;
}

.rules-section {
    text-align: left;
    margin-bottom: 2rem;
    padding: 1.5rem;
    background: var(--background);
    border-radius: var(--radius);
    border: 1px solid var(--border-color);
}

.rules-section h3 {
    color: var(--text-primary);
    margin-bottom: 1rem;
    font-size: 1.1rem;
}

.rules-list {
    list-style: none;
    space-y: 0.5rem;
}

.rules-list li {
    display: flex;
    align-items: center;
    padding: 0.5rem 0;
    color: var(--text-secondary);
    font-size: 0.9rem;
}

.rules-list li::before {
    content: "•";
    color: var(--primary-color);
    margin-right: 0.75rem;
    font-weight: bold;
}

.start-button {
    background: linear-gradient(135deg, var(--primary-color), var(--primary-hover));
    color: white;
    border: none;
    padding: 1rem 2rem;
    border-radius: var(--radius);
    font-size: 1.1rem;
    font-weight: 600;
    cursor: pointer;
    transition: all 0.2s ease;
    display: flex;
    align-items: center;
    gap: 0.75rem;
    margin: 0 auto;
    box-shadow: var(--shadow-md);
}

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

.start-button:active {
    transform: translateY(0);
}

/* Interface d'examen */
.exam-screen {
    padding: 2rem;
    gap: 2rem;
    align-items: flex-start;
    justify-content: center;
}

.progress-bar {
    background: var(--surface);
    border-radius: var(--radius);
    padding: 1rem;
    margin-bottom: 2rem;
    box-shadow: var(--shadow-sm);
    border: 1px solid var(--border-color);
    position: relative;
    overflow: hidden;
}

.progress-fill {
    position: absolute;
    top: 0;
    left: 0;
    height: 100%;
    background: linear-gradient(135deg, var(--primary-color), var(--primary-hover));
    transition: width 0.3s ease;
    opacity: 0.1;
}

.progress-text {
    position: relative;
    z-index: 2;
    font-weight: 600;
    color: var(--text-primary);
    text-align: center;
    display: block;
}

.question-container {
    flex: 1;
    max-width: 800px;
    width: 100%;
}

.question-card {
    background: var(--surface);
    border-radius: var(--radius-lg);
    padding: 2rem;
    box-shadow: var(--shadow-lg);
    border: 1px solid var(--border-color);
}

.question-header {
    display: flex;
    justify-content: space-between;
    align-items: center;
    margin-bottom: 1.5rem;
    padding-bottom: 1rem;
    border-bottom: 1px solid var(--border-color);
}

.question-number {
    font-size: 1.1rem;
    font-weight: 600;
    color: var(--primary-color);
}

.question-category {
    background: var(--background);
    color: var(--text-secondary);
    padding: 0.25rem 0.75rem;
    border-radius: var(--radius);
    font-size: 0.8rem;
    font-weight: 500;
    border: 1px solid var(--border-color);
}

.question-text {
    font-size: 1.2rem;
    line-height: 1.6;
    margin-bottom: 2rem;
    color: var(--text-primary);
    font-weight: 500;
}

.answers-container {
    space-y: 1rem;
    margin-bottom: 2rem;
}

.answer-option {
    display: flex;
    align-items: center;
    padding: 1rem 1.5rem;
    background: var(--surface);
    border: 2px solid var(--border-color);
    border-radius: var(--radius);
    cursor: pointer;
    transition: all 0.2s ease;
    margin-bottom: 1rem;
    font-size: 1rem;
    line-height: 1.4;
}

.answer-option:hover {
    border-color: var(--primary-color);
    background: rgba(37, 99, 235, 0.05);
    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(--error-color);
    background: var(--error-color);
    color: white;
}

.answer-option.disabled {
    pointer-events: none;
    opacity: 0.6;
}

.question-actions {
    display: flex;
    justify-content: space-between;
    align-items: center;
    gap: 1rem;
}

.btn {
    padding: 0.75rem 1.5rem;
    border-radius: var(--radius);
    font-weight: 600;
    cursor: pointer;
    transition: all 0.2s ease;
    border: none;
    display: flex;
    align-items: center;
    gap: 0.5rem;
    font-size: 0.95rem;
}

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

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

.btn-primary:hover:not(:disabled) {
    background: var(--primary-hover);
    transform: translateY(-1px);
}

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

.btn-secondary:hover:not(:disabled) {
    background: #475569;
    transform: translateY(-1px);
}

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

.btn-success:hover:not(:disabled) {
    background: #047857;
    transform: translateY(-1px);
}

/* Navigation entre questions */
.question-navigation {
    background: var(--surface);
    padding: 1.5rem;
    border-radius: var(--radius-lg);
    box-shadow: var(--shadow-sm);
    border: 1px solid var(--border-color);
    min-width: 280px;
    max-width: 320px;
}

.question-navigation h4 {
    margin-bottom: 1rem;
    color: var(--text-primary);
    font-size: 1rem;
}

.question-grid {
    display: grid;
    grid-template-columns: repeat(5, 1fr);
    gap: 0.5rem;
}

.question-nav-item {
    width: 40px;
    height: 40px;
    border: 2px solid var(--border-color);
    background: var(--surface);
    border-radius: var(--radius);
    display: flex;
    align-items: center;
    justify-content: center;
    cursor: pointer;
    transition: all 0.2s ease;
    font-weight: 600;
    font-size: 0.9rem;
    color: var(--text-secondary);
}

.question-nav-item:hover {
    border-color: var(--primary-color);
    color: var(--primary-color);
}

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

.question-nav-item.answered {
    border-color: var(--success-color);
    background: var(--success-color);
    color: white;
}

.question-nav-item.answered:hover {
    border-color: #047857;
    background: #047857;
}

/* Écran de résultats */
.results-content {
    max-width: 900px;
    width: 100%;
    background: var(--surface);
    border-radius: var(--radius-lg);
    padding: 3rem;
    box-shadow: var(--shadow-lg);
    border: 1px solid var(--border-color);
}

.results-header {
    text-align: center;
    margin-bottom: 3rem;
}

.score-circle {
    width: 120px;
    height: 120px;
    border-radius: 50%;
    background: linear-gradient(135deg, var(--primary-color), var(--primary-hover));
    display: flex;
    flex-direction: column;
    align-items: center;
    justify-content: center;
    margin: 0 auto 2rem;
    box-shadow: var(--shadow-lg);
}

.score-value {
    font-size: 2.5rem;
    font-weight: 700;
    color: white;
    line-height: 1;
}

.score-max {
    font-size: 1.2rem;
    color: rgba(255, 255, 255, 0.8);
    font-weight: 500;
}

.results-header h2 {
    font-size: 2rem;
    margin-bottom: 1rem;
    color: var(--text-primary);
}

.result-message {
    font-size: 1.1rem;
    color: var(--text-secondary);
}

.results-stats {
    display: grid;
    grid-template-columns: repeat(auto-fit, minmax(200px, 1fr));
    gap: 2rem;
    margin-bottom: 3rem;
    padding: 2rem;
    background: var(--background);
    border-radius: var(--radius);
    border: 1px solid var(--border-color);
}

.stat-item {
    display: flex;
    flex-direction: column;
    align-items: center;
    text-align: center;
    gap: 0.5rem;
}

.stat-item i {
    font-size: 2rem;
    margin-bottom: 0.5rem;
}

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

.stat-label {
    color: var(--text-secondary);
    font-weight: 500;
    font-size: 0.9rem;
}

.detailed-results {
    margin-bottom: 3rem;
}

.detailed-results h3 {
    font-size: 1.5rem;
    margin-bottom: 1.5rem;
    color: var(--text-primary);
}

.results-list {
    space-y: 1rem;
}

.result-item {
    background: var(--background);
    border-radius: var(--radius);
    padding: 1.5rem;
    border: 1px solid var(--border-color);
    margin-bottom: 1rem;
}

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

.result-item.incorrect {
    border-left: 4px solid var(--error-color);
}

.result-item.no-answer {
    border-left: 4px solid var(--warning-color);
}

.result-question {
    font-weight: 600;
    margin-bottom: 0.75rem;
    color: var(--text-primary);
    font-size: 1rem;
}

.result-answers {
    space-y: 0.5rem;
}

.result-answer {
    display: flex;
    align-items: center;
    gap: 0.5rem;
    font-size: 0.9rem;
    padding: 0.25rem 0;
}

.result-answer i {
    width: 16px;
}

.result-answer.user-answer {
    color: var(--text-primary);
    font-weight: 500;
}

.result-answer.correct-answer {
    color: var(--success-color);
    font-weight: 500;
}

.result-explanation {
    margin-top: 0.75rem;
    padding-top: 0.75rem;
    border-top: 1px solid var(--border-color);
    color: var(--text-secondary);
    font-size: 0.9rem;
    font-style: italic;
}

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

/* Responsive */
@media (max-width: 1024px) {
    .exam-screen {
        flex-direction: column;
        align-items: center;
    }
    
    .question-navigation {
        max-width: 100%;
        width: 100%;
    }
    
    .question-grid {
        grid-template-columns: repeat(10, 1fr);
    }
}

@media (max-width: 768px) {
    .header-content {
        padding: 0 1rem;
    }
    
    .header-info {
        gap: 1rem;
    }
    
    .exam-type {
        display: none;
    }
    
    .welcome-card {
        padding: 2rem;
    }
    
    .exam-info {
        grid-template-columns: 1fr;
    }
    
    .question-card {
        padding: 1.5rem;
    }
    
    .question-actions {
        flex-direction: column;
        gap: 0.5rem;
    }
    
    .results-content {
        padding: 2rem;
    }
    
    .results-stats {
        grid-template-columns: 1fr;
        gap: 1rem;
    }
    
    .results-actions {
        flex-direction: column;
    }
    
    .question-grid {
        grid-template-columns: repeat(5, 1fr);
    }
}

@media (max-width: 480px) {
    .start-screen,
    .exam-screen,
    .results-screen {
        padding: 1rem;
    }
    
    .welcome-card {
        padding: 1.5rem;
    }
    
    .welcome-card h2 {
        font-size: 1.5rem;
    }
    
    .question-card {
        padding: 1rem;
    }
    
    .question-text {
        font-size: 1.1rem;
    }
    
    .answer-option {
        padding: 0.75rem 1rem;
        font-size: 0.9rem;
    }
    
    .results-content {
        padding: 1.5rem;
    }
    
    .score-circle {
        width: 100px;
        height: 100px;
    }
    
    .score-value {
        font-size: 2rem;
    }
}

/* Animations */
@keyframes fadeIn {
    from {
        opacity: 0;
        transform: translateY(20px);
    }
    to {
        opacity: 1;
        transform: translateY(0);
    }
}

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

.welcome-card,
.question-card,
.results-content {
    animation: fadeIn 0.6s ease-out;
}

.answer-option {
    animation: fadeIn 0.4s ease-out;
}

.answer-option:nth-child(1) { animation-delay: 0.1s; }
.answer-option:nth-child(2) { animation-delay: 0.2s; }
.answer-option:nth-child(3) { animation-delay: 0.3s; }
.answer-option:nth-child(4) { animation-delay: 0.4s; }
.answer-option:nth-child(5) { animation-delay: 0.5s; }
.answer-option:nth-child(6) { animation-delay: 0.6s; }
.answer-option:nth-child(7) { animation-delay: 0.7s; }

/* Contact Button & Modal */
.contact-button {
    background: var(--primary-color);
    color: white;
    border: none;
    width: 40px;
    height: 40px;
    border-radius: 50%;
    display: flex;
    align-items: center;
    justify-content: center;
    cursor: pointer;
    transition: all 0.2s ease;
    box-shadow: var(--shadow-sm);
}

.contact-button:hover {
    background: var(--primary-hover);
    transform: translateY(-2px);
    box-shadow: var(--shadow-md);
}

.contact-button:active {
    transform: translateY(0);
}

.contact-button i {
    font-size: 1rem;
}

.contact-modal {
    position: fixed;
    top: 0;
    left: 0;
    width: 100%;
    height: 100%;
    z-index: 1000;
    display: flex;
    align-items: center;
    justify-content: center;
    padding: 2rem;
}

.modal-overlay {
    position: absolute;
    top: 0;
    left: 0;
    width: 100%;
    height: 100%;
    background: rgba(0, 0, 0, 0.5);
    backdrop-filter: blur(4px);
}

.modal-content {
    position: relative;
    background: var(--surface);
    border-radius: var(--radius-lg);
    box-shadow: var(--shadow-lg);
    max-width: 500px;
    width: 100%;
    max-height: 90vh;
    overflow-y: auto;
    animation: modalSlideIn 0.3s ease-out;
}

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

.modal-header {
    display: flex;
    justify-content: space-between;
    align-items: center;
    padding: 2rem 2rem 1rem;
    border-bottom: 1px solid var(--border-color);
}

.modal-header h3 {
    color: var(--text-primary);
    font-size: 1.5rem;
    display: flex;
    align-items: center;
    gap: 0.75rem;
}

.modal-header h3 i {
    color: var(--primary-color);
}

.modal-close {
    background: none;
    border: none;
    color: var(--text-secondary);
    cursor: pointer;
    padding: 0.5rem;
    border-radius: var(--radius);
    transition: all 0.2s ease;
    width: 40px;
    height: 40px;
    display: flex;
    align-items: center;
    justify-content: center;
}

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

.modal-body {
    padding: 2rem;
}

.contact-info {
    space-y: 1.5rem;
}

.contact-item {
    display: flex;
    align-items: center;
    gap: 1rem;
    padding: 1rem;
    background: var(--background);
    border-radius: var(--radius);
    border: 1px solid var(--border-color);
}

.contact-item i {
    color: var(--primary-color);
    font-size: 1.2rem;
    width: 24px;
    text-align: center;
}

.contact-label {
    color: var(--text-secondary);
    font-weight: 500;
    min-width: 80px;
}

.contact-value {
    color: var(--text-primary);
    font-weight: 600;
    flex: 1;
}

.email-link {
    color: var(--primary-color);
    text-decoration: none;
    transition: color 0.2s ease;
}

.email-link:hover {
    color: var(--primary-hover);
    text-decoration: underline;
}

.modal-footer {
    margin-top: 2rem;
    padding-top: 1.5rem;
    border-top: 1px solid var(--border-color);
}

.contact-note {
    color: var(--text-secondary);
    font-size: 0.9rem;
    display: flex;
    align-items: flex-start;
    gap: 0.5rem;
    line-height: 1.5;
}

.contact-note i {
    color: var(--primary-color);
    margin-top: 0.1rem;
    flex-shrink: 0;
}

/* Responsive Modal */
@media (max-width: 768px) {
    .contact-modal {
        padding: 1rem;
    }
    
    .modal-header {
        padding: 1.5rem 1.5rem 1rem;
    }
    
    .modal-header h3 {
        font-size: 1.25rem;
    }
    
    .modal-body {
        padding: 1.5rem;
    }
    
    .contact-item {
        flex-direction: column;
        align-items: flex-start;
        gap: 0.75rem;
    }
    
    .contact-label {
        min-width: auto;
    }
}

@media (max-width: 480px) {
    .header-actions {
        gap: 0.5rem;
    }
    
    .contact-button {
        width: 36px;
        height: 36px;
    }
    
    .contact-button i {
        font-size: 0.9rem;
    }
    
    .timer {
        padding: 0.4rem 0.8rem;
        font-size: 0.8rem;
    }
}