/* === VARIABLES CSS === */
:root {
    --primary-color: #3B82F6;
    --secondary-color: #10B981;
    --accent-color: #F59E0B;
    --error-color: #EF4444;
    --success-color: #22C55E;
    --neutral-color: #6B7280;
    --background-color: #F8FAFC;
    --background: #F8FAFC;
    --card-background: #FFFFFF;
    --text-primary: #1F2937;
    --text-secondary: #6B7280;
    --border-color: #E5E7EB;
    --primary-light: #EBF4FF;
    --shadow-light: 0 2px 4px rgba(0, 0, 0, 0.05);
    --border-radius: 12px;
    --shadow: 0 4px 6px -1px rgba(0, 0, 0, 0.1);
    --shadow-lg: 0 10px 15px -3px rgba(0, 0, 0, 0.1);
    --transition: all 0.3s ease;
}

/* === RESET ET BASE === */
* {
    margin: 0;
    padding: 0;
    box-sizing: border-box;
}

body {
    font-family: -apple-system, BlinkMacSystemFont, 'Segoe UI', Roboto, Oxygen, Ubuntu, Cantarell, sans-serif;
    font-size: 16px;
    line-height: 1.6;
    color: var(--text-primary);
    background: linear-gradient(135deg, #667eea 0%, #764ba2 100%);
    min-height: 100vh;
    overflow-x: hidden;
}

/* === LAYOUT PRINCIPAL === */
.container {
    max-width: 1400px;
    margin: 0 auto;
    padding: 20px;
    min-height: 100vh;
    position: relative;
}

/* Optimisation pour écrans larges */
@media (min-width: 1440px) {
    .container {
        max-width: 1600px;
        padding: 20px 40px;
    }
}

/* === PAGES === */
.page {
    display: none;
    animation: fadeIn 0.4s ease-in-out;
    background: var(--background-color);
    border-radius: var(--border-radius);
    box-shadow: var(--shadow-lg);
    padding: 30px;
    margin-top: 20px;
}

.page.active {
    display: block;
}

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

/* === HERO SECTION === */
.hero {
    text-align: center;
    margin-bottom: 40px;
    padding: 40px 20px;
}

.hero h1 {
    font-size: 3rem;
    font-weight: 700;
    color: var(--primary-color);
    margin-bottom: 15px;
    text-shadow: 2px 2px 4px rgba(0,0,0,0.1);
}

.hero p {
    font-size: 1.3rem;
    color: var(--text-secondary);
    font-weight: 300;
}

/* === PAGE HEADERS === */
.page-header {
    text-align: center;
    margin-bottom: 40px;
}

.page-header h2 {
    font-size: 2.5rem;
    color: var(--primary-color);
    margin-bottom: 10px;
}

.page-header p {
    font-size: 1.1rem;
    color: var(--text-secondary);
}

/* === CARDS SYSTEM === */
.main-options {
    display: grid;
    gap: 20px;
    max-width: 600px;
    margin: 0 auto;
}

.cards-grid {
    display: grid;
    grid-template-columns: repeat(auto-fit, minmax(280px, 1fr));
    gap: 25px;
    margin-top: 30px;
}

.option-card, .game-card, .level-card {
    background: var(--card-background);
    border: 3px solid transparent;
    border-radius: var(--border-radius);
    padding: 30px 25px;
    text-align: center;
    cursor: pointer;
    transition: var(--transition);
    box-shadow: var(--shadow);
    position: relative;
    overflow: hidden;
}

.option-card:hover, .game-card:hover, .level-card:hover {
    transform: translateY(-5px);
    box-shadow: var(--shadow-lg);
    border-color: var(--primary-color);
}

.option-card.primary {
    background: linear-gradient(135deg, var(--primary-color), #2563EB);
    color: white;
    font-size: 1.2rem;
    font-weight: 600;
}

.option-card.primary:hover {
    background: linear-gradient(135deg, #2563EB, var(--primary-color));
    border-color: white;
}

.option-card.secondary {
    border: 2px solid var(--neutral-color);
}

.option-card span {
    display: block;
    margin-top: 10px;
}

.option-card small {
    display: block;
    margin-top: 8px;
    font-size: 0.85rem;
    opacity: 0.7;
}

/* === GAME CARDS === */
.game-card {
    min-height: 180px;
    display: flex;
    flex-direction: column;
    justify-content: center;
    border: 2px solid #e5e7eb;
}

.game-card:hover {
    border-color: var(--primary-color);
    background: linear-gradient(135deg, #f8fafc, #f1f5f9);
}

.game-card .icon {
    font-size: 3rem;
    margin-bottom: 15px;
}

.game-card .title {
    font-size: 1.4rem;
    font-weight: 600;
    color: var(--text-primary);
    margin-bottom: 8px;
}

.game-card .description {
    font-size: 0.95rem;
    color: var(--text-secondary);
    line-height: 1.4;
}

/* === LEVEL CARDS === */
.level-card {
    min-height: 160px;
    border: 2px solid #e5e7eb;
}

.level-card:hover {
    border-color: var(--secondary-color);
    background: linear-gradient(135deg, #f0fdf4, #ecfdf5);
}

.level-card .icon {
    font-size: 2.5rem;
    margin-bottom: 12px;
}

.level-card .title {
    font-size: 1.2rem;
    font-weight: 600;
    color: var(--text-primary);
    margin-bottom: 6px;
}

.level-card .description {
    font-size: 0.9rem;
    color: var(--text-secondary);
}

/* === BOUTONS === */
button {
    border: none;
    outline: none;
    cursor: pointer;
    font-family: inherit;
    font-size: inherit;
    transition: var(--transition);
    border-radius: var(--border-radius);
    padding: 12px 24px;
    font-weight: 500;
}

.back-btn {
    background: var(--neutral-color);
    color: white;
    padding: 10px 20px;
    border-radius: 25px;
    font-size: 0.9rem;
}

.back-btn:hover {
    background: #4B5563;
    transform: translateX(-2px);
}

/* === MODAL === */
.modal {
    position: fixed;
    top: 0;
    left: 0;
    width: 100%;
    height: 100%;
    background: rgba(0, 0, 0, 0.5);
    display: flex;
    align-items: center;
    justify-content: center;
    z-index: 1000;
    opacity: 0;
    visibility: hidden;
    transition: var(--transition);
}

.modal.show {
    opacity: 1;
    visibility: visible;
}

.modal-content {
    background: var(--card-background);
    padding: 40px;
    border-radius: var(--border-radius);
    box-shadow: var(--shadow-lg);
    text-align: center;
    max-width: 400px;
    margin: 20px;
    transform: scale(0.9);
    transition: var(--transition);
}

.modal.show .modal-content {
    transform: scale(1);
}

.modal-content h3 {
    color: var(--primary-color);
    margin-bottom: 15px;
    font-size: 1.5rem;
}

.modal-content p {
    color: var(--text-secondary);
    margin-bottom: 25px;
}

.modal-content button {
    background: var(--primary-color);
    color: white;
    padding: 12px 30px;
    border-radius: 25px;
}

.modal-content button:hover {
    background: #2563EB;
}

/* === LOADING === */
.loading {
    position: fixed;
    top: 0;
    left: 0;
    width: 100%;
    height: 100%;
    background: rgba(255, 255, 255, 0.9);
    display: flex;
    flex-direction: column;
    align-items: center;
    justify-content: center;
    z-index: 999;
    opacity: 0;
    visibility: hidden;
    transition: var(--transition);
}

.loading.show {
    opacity: 1;
    visibility: visible;
}

.spinner {
    width: 50px;
    height: 50px;
    border: 4px solid #f3f3f3;
    border-top: 4px solid var(--primary-color);
    border-radius: 50%;
    animation: spin 1s linear infinite;
    margin-bottom: 20px;
}

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

/* === RESPONSIVE === */
@media (max-width: 768px) {
    .container {
        padding: 15px;
    }
    
    .hero h1 {
        font-size: 2.2rem;
    }
    
    .hero p {
        font-size: 1.1rem;
    }
    
    .page-header h2 {
        font-size: 2rem;
    }
    
    .cards-grid {
        grid-template-columns: 1fr;
        gap: 20px;
    }
    
    .page {
        padding: 20px;
    }
}

@media (max-width: 480px) {
    .hero h1 {
        font-size: 1.8rem;
    }
    
    .option-card, .game-card, .level-card {
        padding: 20px 15px;
    }
    
    .modal-content {
        padding: 30px 20px;
        margin: 15px;
    }
}