/**
 * Math Quiz Kids - Styles Principaux
 * Slama Consulting © 2025
 * Design moderne et attractif pour enfants
 */

@import url('https://fonts.googleapis.com/css2?family=Fredoka:wght@300;400;500;600;700&display=swap');

:root {
    --primary: #6C63FF;
    --primary-dark: #5548c9;
    --primary-light: #8B84FF;
    --secondary: #FF6B9D;
    --accent-yellow: #FFD93D;
    --accent-green: #6BCB77;
    --accent-orange: #FF9F43;
    --accent-cyan: #4ECDC4;
    --bg-gradient-start: #667eea;
    --bg-gradient-end: #764ba2;
    --bg-card: rgba(255, 255, 255, 0.95);
    --text-dark: #2D3748;
    --text-light: #718096;
    --text-white: #FFFFFF;
    --success: #48BB78;
    --error: #F56565;
    --warning: #ED8936;
    --shadow-sm: 0 2px 8px rgba(0, 0, 0, 0.08);
    --shadow-md: 0 4px 20px rgba(0, 0, 0, 0.12);
    --shadow-lg: 0 8px 40px rgba(0, 0, 0, 0.15);
    --shadow-glow: 0 0 30px rgba(108, 99, 255, 0.3);
    --radius-sm: 12px;
    --radius-md: 20px;
    --radius-lg: 30px;
    --radius-full: 50px;
    --transition-fast: 0.2s ease;
    --transition-normal: 0.3s ease;
}

*, *::before, *::after { margin: 0; padding: 0; box-sizing: border-box; }
html { scroll-behavior: smooth; }

body {
    font-family: 'Fredoka', sans-serif;
    background: linear-gradient(135deg, var(--bg-gradient-start) 0%, var(--bg-gradient-end) 100%);
    min-height: 100vh;
    color: var(--text-dark);
    overflow-x: hidden;
}

.bg-shapes { position: fixed; top: 0; left: 0; width: 100%; height: 100%; overflow: hidden; z-index: -1; pointer-events: none; }
.bg-shape { position: absolute; opacity: 0.1; animation: float 20s ease-in-out infinite; border-radius: 50%; }
.bg-shape:nth-child(1) { top: 10%; left: 10%; width: 100px; height: 100px; background: var(--accent-yellow); animation-delay: 0s; }
.bg-shape:nth-child(2) { top: 60%; right: 10%; width: 150px; height: 150px; background: var(--secondary); animation-delay: -5s; }
.bg-shape:nth-child(3) { bottom: 20%; left: 20%; width: 80px; height: 80px; background: var(--accent-green); animation-delay: -10s; }
.bg-shape:nth-child(4) { top: 30%; right: 25%; width: 120px; height: 120px; background: var(--accent-cyan); animation-delay: -15s; }

@keyframes float { 0%, 100% { transform: translateY(0) rotate(0deg); } 50% { transform: translateY(-30px) rotate(180deg); } }

/* ==================== HEADER ==================== */
.header {
    background: rgba(255, 255, 255, 0.1);
    backdrop-filter: blur(20px);
    padding: 12px 20px;
    position: sticky;
    top: 0;
    z-index: 1000;
    border-bottom: 1px solid rgba(255, 255, 255, 0.1);
}

.header.quiz-active {
    display: none;
}

.header-content {
    max-width: 1400px;
    margin: 0 auto;
    display: flex;
    flex-direction: row;
    justify-content: space-between;
    align-items: center;
    gap: 20px;
}

.logo {
    display: flex;
    align-items: center;
    gap: 10px;
    text-decoration: none;
    color: white;
    flex-shrink: 0;
}

.logo-icon {
    width: 45px;
    height: 45px;
    background: linear-gradient(135deg, var(--accent-yellow), var(--accent-orange));
    border-radius: 12px;
    display: flex;
    align-items: center;
    justify-content: center;
    font-size: 24px;
}

.logo-text {
    font-size: 1.4rem;
    font-weight: 700;
    color: white;
}

.logo-text span {
    color: var(--accent-yellow);
}

.nav-links {
    display: flex;
    flex-direction: row !important;
    gap: 8px;
    align-items: center;
    flex-wrap: nowrap;
}

.nav-link {
    color: white;
    text-decoration: none;
    font-weight: 500;
    padding: 10px 16px;
    border-radius: 25px;
    transition: all 0.2s;
    font-size: 0.95rem;
    white-space: nowrap;
    display: inline-flex;
    align-items: center;
    gap: 5px;
}

.nav-link:hover {
    background: rgba(255, 255, 255, 0.15);
}

.nav-link.active {
    background: white;
    color: var(--primary);
}

.sound-btn {
    background: none;
    border: none;
    font-size: 1.2rem;
    cursor: pointer;
    padding: 8px;
    border-radius: 50%;
}

.sound-btn:hover {
    background: rgba(255, 255, 255, 0.15);
}

.user-section {
    display: flex;
    align-items: center;
    gap: 12px;
    flex-shrink: 0;
}

.user-logged {
    display: flex;
    align-items: center;
    gap: 10px;
    background: rgba(255, 255, 255, 0.15);
    padding: 6px 12px 6px 6px;
    border-radius: 30px;
}

.user-info {
    display: flex;
    align-items: center;
    gap: 10px;
    cursor: pointer;
}

.user-avatar {
    width: 36px;
    height: 36px;
    border-radius: 50%;
    border: 2px solid rgba(255, 255, 255, 0.3);
}

.user-points {
    color: var(--accent-yellow);
    font-weight: 600;
    font-size: 0.9rem;
}

.logout-btn {
    background: none;
    border: none;
    font-size: 1.1rem;
    cursor: pointer;
    opacity: 0.7;
}

.logout-btn:hover {
    opacity: 1;
}

.guest-buttons {
    display: flex;
    gap: 10px;
}

.guest-buttons .btn {
    padding: 8px 16px;
    font-size: 0.9rem;
}

.guest-buttons .btn-outline {
    background: transparent;
    border: 2px solid rgba(255, 255, 255, 0.6);
    color: white;
}

.guest-buttons .btn-outline:hover {
    background: rgba(255, 255, 255, 0.1);
    border-color: white;
}

/* ==================== RESPONSIVE MOBILE - HEADER ==================== */
@media (max-width: 768px) {
    .header {
        padding: 10px 15px;
    }
    
    .header-content {
        flex-wrap: wrap;
        justify-content: space-between;
        gap: 10px;
    }
    
    .logo {
        flex: 0 0 auto;
        width: auto;
    }
    
    .logo-icon {
        width: 38px;
        height: 38px;
        font-size: 20px;
    }
    
    .logo-text {
        font-size: 1.1rem;
    }
    
    /* Navigation en ligne sur mobile */
    .nav-links {
        order: 3;
        width: 100%;
        justify-content: center;
        flex-wrap: nowrap;
        gap: 5px;
        margin-top: 5px;
    }
    
    .nav-link {
        padding: 8px 12px;
        font-size: 0.8rem;
    }
    
    .sound-btn {
        padding: 6px;
        font-size: 1rem;
    }
    
    /* Boutons auth compacts sur mobile */
    .user-section {
        flex: 0 0 auto;
        width: auto;
    }
    
    .guest-buttons {
        flex-direction: row;
        gap: 8px;
    }
    
    .guest-buttons .btn {
        padding: 8px 14px;
        font-size: 0.8rem;
        white-space: nowrap;
    }
    
    .user-logged {
        padding: 5px 10px 5px 5px;
    }
    
    .user-avatar {
        width: 30px;
        height: 30px;
    }
    
    .user-points {
        font-size: 0.8rem;
    }
    
    .logout-btn {
        font-size: 1rem;
    }
}

/* Très petits écrans */
@media (max-width: 480px) {
    .header-content {
        justify-content: center;
    }
    
    .logo {
        width: 100%;
        justify-content: center;
        margin-bottom: 5px;
    }
    
    .user-section {
        width: 100%;
        justify-content: center;
    }
    
    .guest-buttons {
        width: 100%;
        max-width: 300px;
    }
    
    .guest-buttons .btn {
        flex: 1;
        text-align: center;
        padding: 10px 12px;
    }
    
    .nav-links {
        gap: 3px;
    }
    
    .nav-link {
        padding: 6px 10px;
        font-size: 0.75rem;
    }
}
}

@media (max-width: 500px) {
    .nav-link {
        padding: 6px 10px;
        font-size: 0.8rem;
    }
    
    .guest-buttons .btn {
        padding: 10px 14px;
        font-size: 0.85rem;
    }
}

.user-info:hover {
    opacity: 0.9;
}

.user-avatar {
    width: 42px;
    height: 42px;
    border-radius: 50%;
    border: 3px solid var(--accent-yellow);
    transition: var(--transition-fast);
    box-shadow: 0 2px 8px rgba(0, 0, 0, 0.2);
}

.user-avatar:hover {
    transform: scale(1.05);
    border-color: var(--text-white);
}

.user-details {
    display: flex;
    flex-direction: column;
    gap: 2px;
}

.user-details .username {
    color: var(--text-white);
    font-weight: 600;
    font-size: 0.95rem;
    line-height: 1.2;
}

.user-details .user-points {
    color: var(--accent-yellow);
    font-size: 0.8rem;
    font-weight: 500;
}

.logout-btn {
    background: rgba(255, 255, 255, 0.1);
    border: none;
    width: 36px;
    height: 36px;
    border-radius: 50%;
    cursor: pointer;
    font-size: 1.1rem;
    transition: var(--transition-fast);
    display: flex;
    align-items: center;
    justify-content: center;
}

.logout-btn:hover {
    background: rgba(255, 100, 100, 0.3);
    transform: scale(1.1);
}

.guest-buttons {
    display: flex;
    gap: 10px;
    align-items: center;
}

/* Responsive pour mobile */
@media (max-width: 768px) {
    .header-content {
        flex-direction: column;
        align-items: center;
        gap: 12px;
    }
    
    .nav-links {
        display: flex;
        flex-wrap: wrap;
        justify-content: center;
        gap: 8px;
        width: 100%;
    }
    
    .nav-link {
        padding: 8px 14px;
        font-size: 0.85rem;
    }
    
    .guest-buttons {
        display: flex;
        flex-direction: row;
        gap: 10px;
        width: 100%;
        max-width: 320px;
        justify-content: center;
    }
    
    .guest-buttons .btn {
        flex: 1;
        padding: 12px 16px;
        font-size: 0.9rem;
        text-align: center;
        white-space: nowrap;
        border-radius: 15px;
        min-width: 130px;
    }
    
    .guest-buttons .btn-outline {
        background: rgba(255, 255, 255, 0.95);
        color: var(--primary) !important;
        border: 2px solid white !important;
    }
    
    .guest-buttons .btn-primary {
        background: linear-gradient(135deg, var(--primary-light), var(--primary));
    }
    
    .user-logged {
        padding: 8px 12px;
        width: 100%;
        max-width: 280px;
        justify-content: center;
    }
    
    .user-details .username {
        display: none;
    }
    
    .user-avatar {
        width: 36px;
        height: 36px;
    }
}

@media (max-width: 480px) {
    .header {
        padding: 10px;
    }
    
    .logo-icon {
        width: 40px;
        height: 40px;
        font-size: 22px;
    }
    
    .logo-text {
        font-size: 1.1rem;
    }
    
    .nav-links {
        gap: 5px;
    }
    
    .nav-link {
        padding: 6px 10px;
        font-size: 0.8rem;
    }
    
    .guest-buttons {
        flex-direction: column;
        gap: 8px;
        max-width: 250px;
    }
    
    .guest-buttons .btn {
        width: 100%;
        padding: 14px 20px;
        font-size: 1rem;
    }
}

.ad-banner { background: rgba(255, 255, 255, 0.05); text-align: center; padding: 8px; }
.ad-banner-content { max-width: 728px; margin: 0 auto; min-height: 90px; background: rgba(255, 255, 255, 0.03); border-radius: var(--radius-sm); display: flex; align-items: center; justify-content: center; color: rgba(255,255,255,0.3); font-size: 0.8rem; }

.main-container { max-width: 1200px; margin: 0 auto; padding: 30px 20px; }

.hero { text-align: center; padding: 40px 20px; color: var(--text-white); }
.hero h1 { font-size: 3rem; font-weight: 700; margin-bottom: 15px; text-shadow: 2px 2px 10px rgba(0, 0, 0, 0.2); }
.hero h1 .emoji { display: inline-block; animation: bounce 2s ease infinite; }
.hero p { font-size: 1.2rem; opacity: 0.9; max-width: 600px; margin: 0 auto 30px; }

@keyframes bounce { 0%, 100% { transform: translateY(0); } 50% { transform: translateY(-10px); } }

.card { background: var(--bg-card); border-radius: var(--radius-md); padding: 25px; box-shadow: var(--shadow-md); transition: var(--transition-normal); }
.card:hover { transform: translateY(-5px); box-shadow: var(--shadow-lg); }
.card-header { display: flex; justify-content: space-between; align-items: center; margin-bottom: 20px; }
.card-title { font-size: 1.3rem; font-weight: 600; display: flex; align-items: center; gap: 10px; }

.level-grid { display: grid; grid-template-columns: repeat(auto-fit, minmax(200px, 1fr)); gap: 20px; margin-top: 30px; }
.level-card { background: var(--bg-card); border-radius: var(--radius-md); padding: 30px 20px; text-align: center; cursor: pointer; transition: var(--transition-normal); border: 3px solid transparent; position: relative; overflow: hidden; }
.level-card::before { content: ''; position: absolute; top: 0; left: 0; right: 0; height: 5px; background: linear-gradient(90deg, var(--primary), var(--secondary)); transform: scaleX(0); transition: var(--transition-normal); }
.level-card:hover { transform: translateY(-8px); box-shadow: var(--shadow-lg); }
.level-card:hover::before { transform: scaleX(1); }

.level-card.cp { border-color: #FF6B6B; }
.level-card.ce1 { border-color: #4ECDC4; }
.level-card.ce2 { border-color: #45B7D1; }
.level-card.cm1 { border-color: #96E6A1; }
.level-card.cm2 { border-color: #DDA0DD; }

.level-icon { width: 80px; height: 80px; margin: 0 auto 15px; border-radius: 50%; display: flex; align-items: center; justify-content: center; font-size: 2.5rem; }
.level-card.cp .level-icon { background: linear-gradient(135deg, #FF6B6B, #FF8E8E); }
.level-card.ce1 .level-icon { background: linear-gradient(135deg, #4ECDC4, #7EDDD6); }
.level-card.ce2 .level-icon { background: linear-gradient(135deg, #45B7D1, #76C9DD); }
.level-card.cm1 .level-icon { background: linear-gradient(135deg, #96E6A1, #B5F0BD); }
.level-card.cm2 .level-icon { background: linear-gradient(135deg, #DDA0DD, #E8C0E8); }

.level-name { font-size: 1.8rem; font-weight: 700; margin-bottom: 5px; }
.level-age { color: var(--text-light); font-size: 0.95rem; }
.level-quiz-count { margin-top: 15px; padding-top: 15px; border-top: 1px solid rgba(0, 0, 0, 0.1); font-size: 0.85rem; color: var(--text-light); }

.mode-selector { display: flex; gap: 15px; justify-content: center; flex-wrap: wrap; margin: 30px 0; }
.mode-btn { padding: 15px 30px; border: none; border-radius: var(--radius-full); font-family: 'Fredoka', sans-serif; font-size: 1.1rem; font-weight: 600; cursor: pointer; transition: var(--transition-fast); display: flex; align-items: center; gap: 10px; color: white; }
.mode-btn.easy { background: linear-gradient(135deg, var(--accent-green), #85D98D); }
.mode-btn.normal { background: linear-gradient(135deg, var(--accent-orange), #FFB366); }
.mode-btn.hard { background: linear-gradient(135deg, var(--error), #F78888); }
.mode-btn:hover { transform: scale(1.05); box-shadow: var(--shadow-md); }
.mode-btn.selected { transform: scale(1.1); box-shadow: var(--shadow-glow); }
.mode-time { font-size: 0.85rem; opacity: 0.9; }

.quiz-container { max-width: 800px; margin: 0 auto; }
.quiz-header { background: var(--bg-card); border-radius: var(--radius-md); padding: 15px 25px; margin-bottom: 20px; display: flex; justify-content: space-between; align-items: center; flex-wrap: wrap; gap: 15px; }
.quiz-info { display: flex; gap: 15px; align-items: center; }
.quiz-badge { padding: 8px 16px; border-radius: var(--radius-full); font-weight: 600; font-size: 0.9rem; background: var(--primary); color: white; }
.quiz-badge#quiz-difficulty-badge { background: transparent; color: var(--text-dark); padding: 0; }
.quiz-progress-container { display: flex; flex-direction: column; align-items: center; gap: 5px; flex: 1; max-width: 300px; }
.progress-bar { width: 100%; height: 10px; background: rgba(108, 99, 255, 0.15); border-radius: var(--radius-full); overflow: hidden; }
.progress-fill { height: 100%; background: linear-gradient(90deg, var(--secondary), var(--primary)); border-radius: var(--radius-full); transition: width 0.5s ease; }
.progress-text { font-size: 0.8rem; color: var(--text-light); }
.quiz-stats { display: flex; align-items: center; gap: 15px; }
.quiz-score { display: flex; align-items: center; gap: 5px; font-size: 1.1rem; font-weight: 600; color: var(--accent-green); }

.timer-circle { width: 50px; height: 50px; border-radius: 50%; display: flex; align-items: center; justify-content: center; font-size: 1.3rem; font-weight: 700; color: white; background: linear-gradient(135deg, #FF9F43, #FF7F00); box-shadow: 0 4px 12px rgba(255, 159, 67, 0.4); }
.timer-circle.warning { background: linear-gradient(135deg, #FF9F43, #FF6B00); animation: pulse 0.5s ease infinite; }
.timer-circle.danger { background: linear-gradient(135deg, #F56565, #E53E3E); box-shadow: 0 4px 12px rgba(245, 101, 101, 0.5); animation: shake 0.3s ease infinite; }

.timer-container { display: flex; flex-direction: column; align-items: center; gap: 8px; }
.timer { width: 50px; height: 50px; border-radius: 50%; display: flex; align-items: center; justify-content: center; font-size: 1.3rem; font-weight: 700; color: white; background: linear-gradient(135deg, #FF9F43, #FF7F00); box-shadow: 0 4px 12px rgba(255, 159, 67, 0.4); }
.timer.warning { background: linear-gradient(135deg, #FF9F43, #FF6B00); animation: pulse 0.5s ease infinite; }
.timer.danger { background: linear-gradient(135deg, #F56565, #E53E3E); box-shadow: 0 4px 12px rgba(245, 101, 101, 0.5); animation: shake 0.3s ease infinite; }

@keyframes pulse { 0%, 100% { transform: scale(1); } 50% { transform: scale(1.1); } }
@keyframes shake { 0%, 100% { transform: translateX(0); } 25% { transform: translateX(-5px); } 75% { transform: translateX(5px); } }

.question-card { background: var(--bg-card); border-radius: var(--radius-lg); padding: 40px; text-align: center; box-shadow: var(--shadow-lg); animation: slideIn 0.5s ease; }
@keyframes slideIn { from { opacity: 0; transform: translateY(30px); } to { opacity: 1; transform: translateY(0); } }

.question-emoji { font-size: 4rem; margin-bottom: 20px; animation: bounce 2s ease infinite; }
.question-number { font-size: 0.95rem; color: var(--text-light); margin-bottom: 15px; }
.question-text { font-size: 1.6rem; font-weight: 600; margin-bottom: 35px; line-height: 1.4; white-space: pre-line; }

.answers-grid { display: grid; grid-template-columns: repeat(2, 1fr); gap: 15px; max-width: 500px; margin: 0 auto; }
.answer-btn { padding: 20px; border: 3px solid rgba(108, 99, 255, 0.2); border-radius: var(--radius-md); background: white; font-family: 'Fredoka', sans-serif; font-size: 1.3rem; font-weight: 600; cursor: pointer; transition: var(--transition-fast); }
.answer-btn:hover { border-color: var(--primary); transform: scale(1.03); box-shadow: var(--shadow-md); }
.answer-btn.correct { background: linear-gradient(135deg, var(--accent-green), #85D98D); border-color: var(--accent-green); color: white; animation: correctPulse 0.5s ease; }
.answer-btn.wrong { background: linear-gradient(135deg, var(--error), #F78888); border-color: var(--error); color: white; animation: wrongShake 0.5s ease; }
.answer-btn:disabled { cursor: not-allowed; opacity: 0.7; }

@keyframes correctPulse { 0%, 100% { transform: scale(1); } 50% { transform: scale(1.1); } }
@keyframes wrongShake { 0%, 100% { transform: translateX(0); } 20%, 60% { transform: translateX(-10px); } 40%, 80% { transform: translateX(10px); } }

.result-screen { background: var(--bg-card); border-radius: var(--radius-lg); padding: 50px; text-align: center; animation: popIn 0.5s ease; }
@keyframes popIn { 0% { opacity: 0; transform: scale(0.5); } 100% { opacity: 1; transform: scale(1); } }

.result-emoji { font-size: 6rem; margin-bottom: 20px; }
.result-title { font-size: 2.5rem; font-weight: 700; margin-bottom: 10px; }
.result-score { font-size: 3rem; font-weight: 700; margin: 20px 0; }
.result-score.excellent { color: var(--accent-green); }
.result-score.good { color: var(--accent-orange); }
.result-score.average { color: var(--warning); }
.result-score.poor { color: var(--error); }
.result-points { font-size: 1.3rem; color: var(--accent-yellow); background: rgba(255, 217, 61, 0.1); padding: 15px 30px; border-radius: var(--radius-full); display: inline-block; margin: 20px 0; }
.result-message { font-size: 1.2rem; color: var(--text-light); margin-bottom: 30px; }
.result-actions { display: flex; gap: 15px; justify-content: center; flex-wrap: wrap; }

.btn { padding: 15px 30px; border: none; border-radius: var(--radius-full); font-family: 'Fredoka', sans-serif; font-size: 1.1rem; font-weight: 600; cursor: pointer; transition: var(--transition-fast); display: inline-flex; align-items: center; gap: 10px; text-decoration: none; }
.btn:hover { transform: translateY(-3px); box-shadow: var(--shadow-md); }
.btn-primary { background: linear-gradient(135deg, var(--primary), var(--primary-light)); color: white; }
.btn-secondary { background: linear-gradient(135deg, var(--secondary), #FF8EB5); color: white; }
.btn-success { background: linear-gradient(135deg, var(--accent-green), #85D98D); color: white; }
.btn-outline { background: transparent; border: 2px solid var(--primary); color: var(--primary); }
.btn-outline:hover { background: var(--primary); color: white; }
.btn-lg { padding: 18px 40px; font-size: 1.3rem; }

.leaderboard-tabs { display: flex; gap: 10px; margin-bottom: 25px; justify-content: center; }
.tab-btn { padding: 12px 25px; border: none; border-radius: var(--radius-full); background: rgba(0, 0, 0, 0.05); font-family: 'Fredoka', sans-serif; font-size: 1rem; font-weight: 500; color: var(--text-light); cursor: pointer; transition: var(--transition-fast); }
.tab-btn.active { background: var(--primary); color: white; }

.leaderboard-list { display: flex; flex-direction: column; gap: 10px; }
.leaderboard-item { display: flex; align-items: center; padding: 15px 20px; background: var(--bg-card); border-radius: var(--radius-md); transition: var(--transition-fast); }
.leaderboard-item:hover { transform: translateX(5px); box-shadow: var(--shadow-sm); }
.leaderboard-item.top-1 { background: linear-gradient(135deg, #FFD700, #FFF4B8); border: 2px solid #FFD700; }
.leaderboard-item.top-2 { background: linear-gradient(135deg, #C0C0C0, #E8E8E8); border: 2px solid #C0C0C0; }
.leaderboard-item.top-3 { background: linear-gradient(135deg, #CD7F32, #E8C896); border: 2px solid #CD7F32; }
.leaderboard-item.current-user { border: 2px solid var(--primary); }
.rank { width: 40px; height: 40px; border-radius: 50%; display: flex; align-items: center; justify-content: center; font-weight: 700; font-size: 1.1rem; margin-right: 15px; background: rgba(0, 0, 0, 0.1); }
.leaderboard-item.top-1 .rank { font-size: 1.5rem; }
.leaderboard-avatar { width: 45px; height: 45px; border-radius: 50%; margin-right: 15px; }
.leaderboard-name { flex: 1; font-weight: 600; font-size: 1.1rem; }
.leaderboard-points { font-weight: 700; font-size: 1.1rem; color: var(--primary); display: flex; align-items: center; gap: 5px; }

.challenge-grid { display: grid; grid-template-columns: repeat(auto-fill, minmax(300px, 1fr)); gap: 20px; }
.challenge-card { background: var(--bg-card); border-radius: var(--radius-md); padding: 25px; border-left: 5px solid var(--primary); transition: var(--transition-fast); }
.challenge-card:hover { transform: translateY(-5px); box-shadow: var(--shadow-lg); }
.challenge-header { display: flex; justify-content: space-between; align-items: flex-start; margin-bottom: 15px; }
.challenge-title { font-size: 1.2rem; font-weight: 600; }
.challenge-badge { padding: 5px 12px; border-radius: var(--radius-full); font-size: 0.8rem; font-weight: 600; }
.challenge-badge.easy { background: rgba(107, 203, 119, 0.2); color: var(--accent-green); }
.challenge-badge.normal { background: rgba(255, 159, 67, 0.2); color: var(--accent-orange); }
.challenge-badge.hard { background: rgba(245, 101, 101, 0.2); color: var(--error); }
.challenge-info { display: flex; gap: 20px; margin-bottom: 15px; color: var(--text-light); font-size: 0.9rem; }
.challenge-info span { display: flex; align-items: center; gap: 5px; }
.challenge-creator { display: flex; align-items: center; gap: 10px; padding-top: 15px; border-top: 1px solid rgba(0, 0, 0, 0.1); }
.challenge-creator img { width: 30px; height: 30px; border-radius: 50%; }
.challenge-creator span { font-size: 0.9rem; color: var(--text-light); }

.modal-overlay { 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: 2000; opacity: 0; visibility: hidden; pointer-events: none; transition: var(--transition-normal); }
.modal-overlay.active { opacity: 1; visibility: visible; pointer-events: auto; }
.modal { background: var(--bg-card); border-radius: var(--radius-lg); padding: 40px; max-width: 500px; width: 90%; max-height: 90vh; overflow-y: auto; transform: scale(0.8); transition: var(--transition-normal); }
.modal-overlay.active .modal { transform: scale(1); }
.modal-header { display: flex; justify-content: space-between; align-items: center; margin-bottom: 25px; }
.modal-title { font-size: 1.5rem; font-weight: 700; }
.modal-close { width: 40px; height: 40px; border: none; border-radius: 50%; background: rgba(0, 0, 0, 0.05); font-size: 1.5rem; cursor: pointer; transition: var(--transition-fast); }
.modal-close:hover { background: var(--error); color: white; }

.form-group { margin-bottom: 20px; }
.form-label { display: block; margin-bottom: 8px; font-weight: 500; }
.form-input { width: 100%; padding: 15px 20px; border: 2px solid rgba(0, 0, 0, 0.1); border-radius: var(--radius-md); font-family: 'Fredoka', sans-serif; font-size: 1rem; transition: var(--transition-fast); }
.form-input:focus { outline: none; border-color: var(--primary); box-shadow: 0 0 0 3px rgba(108, 99, 255, 0.1); }
.form-input.error { border-color: var(--error); }
.form-error { color: var(--error); font-size: 0.85rem; margin-top: 5px; }
.form-select { appearance: none; background-image: url("data:image/svg+xml,%3Csvg xmlns='http://www.w3.org/2000/svg' width='24' height='24' viewBox='0 0 24 24' fill='none' stroke='%236C63FF' stroke-width='2'%3E%3Cpolyline points='6 9 12 15 18 9'%3E%3C/polyline%3E%3C/svg%3E"); background-repeat: no-repeat; background-position: right 15px center; background-size: 20px; padding-right: 50px; }

.avatar-grid { display: grid; grid-template-columns: repeat(5, 1fr); gap: 15px; margin-top: 15px; }
.avatar-option { width: 60px; height: 60px; border-radius: 50%; cursor: pointer; border: 3px solid transparent; transition: var(--transition-fast); }
.avatar-option:hover { transform: scale(1.1); }
.avatar-option.selected { border-color: var(--primary); box-shadow: var(--shadow-glow); }

.interstitial-overlay { position: fixed; top: 0; left: 0; right: 0; bottom: 0; background: rgba(0, 0, 0, 0.9); display: flex; flex-direction: column; align-items: center; justify-content: center; z-index: 3000; opacity: 0; visibility: hidden; pointer-events: none; transition: var(--transition-normal); }
.interstitial-overlay.active { opacity: 1; visibility: visible; pointer-events: auto; }
.interstitial-overlay.active { opacity: 1; visibility: visible; }
.interstitial-content { background: var(--bg-card); border-radius: var(--radius-lg); padding: 30px; text-align: center; max-width: 600px; width: 90%; }
.interstitial-countdown { font-size: 1rem; color: var(--text-light); margin-bottom: 20px; }
.interstitial-timer { width: 60px; height: 60px; border-radius: 50%; background: var(--primary); color: white; display: flex; align-items: center; justify-content: center; font-size: 1.5rem; font-weight: 700; margin: 0 auto 20px; }
.interstitial-ad { min-height: 250px; background: rgba(0, 0, 0, 0.05); border-radius: var(--radius-md); display: flex; align-items: center; justify-content: center; margin-bottom: 20px; color: var(--text-light); }
.interstitial-close { opacity: 0; transition: opacity 0.3s; }
.interstitial-close.visible { opacity: 1; }

.footer { background: rgba(0, 0, 0, 0.2); padding: 30px; text-align: center; color: rgba(255, 255, 255, 0.7); margin-top: 50px; }
.footer-content { max-width: 1200px; margin: 0 auto; }
.footer-logo { font-size: 1.3rem; font-weight: 700; color: var(--text-white); margin-bottom: 10px; }
.footer-copyright { font-size: 0.9rem; }
.footer-links { display: flex; gap: 20px; justify-content: center; margin-top: 15px; }
.footer-links a { color: rgba(255, 255, 255, 0.7); text-decoration: none; transition: var(--transition-fast); }
.footer-links a:hover { color: var(--text-white); }

.hidden { display: none !important; }
.text-center { text-align: center; }
.mt-20 { margin-top: 20px; }
.mb-20 { margin-bottom: 20px; }

@media (max-width: 768px) {
    .hero h1 { font-size: 2rem; }
    .level-grid { grid-template-columns: repeat(2, 1fr); }
    .question-card { padding: 25px; }
    .question-text { font-size: 1.3rem; }
    .answers-grid { grid-template-columns: 1fr; }
    .result-screen { padding: 30px; }
    .result-title { font-size: 1.8rem; }
    .quiz-header { flex-direction: column; text-align: center; }
    .mode-selector { flex-direction: column; align-items: stretch; }
    .mode-btn { justify-content: center; }
}

@media (max-width: 480px) {
    .level-grid { grid-template-columns: 1fr; }
    .avatar-grid { grid-template-columns: repeat(4, 1fr); }
    .result-actions { flex-direction: column; }
    .btn { width: 100%; justify-content: center; }
}

.confetti { position: fixed; width: 10px; height: 10px; animation: confetti-fall 3s ease-out forwards; pointer-events: none; z-index: 1000; }
@keyframes confetti-fall { 0% { transform: translateY(-100vh) rotate(0deg); opacity: 1; } 100% { transform: translateY(100vh) rotate(720deg); opacity: 0; } }

.stats-grid { display: grid; grid-template-columns: repeat(auto-fit, minmax(150px, 1fr)); gap: 15px; margin-bottom: 30px; }
.stat-card { background: linear-gradient(135deg, var(--primary), var(--primary-light)); color: white; padding: 20px; border-radius: var(--radius-md); text-align: center; }
.stat-value { font-size: 2rem; font-weight: 700; }
.stat-label { font-size: 0.9rem; opacity: 0.9; }

.filters { display: flex; gap: 15px; margin-bottom: 20px; flex-wrap: wrap; }
.filter-select { padding: 10px 20px; border: 2px solid rgba(0,0,0,0.1); border-radius: var(--radius-full); font-family: 'Fredoka', sans-serif; background: white; }

.alert { padding: 15px 20px; border-radius: var(--radius-md); margin-bottom: 20px; }
.alert-success { background: rgba(107, 203, 119, 0.1); border: 1px solid var(--accent-green); color: var(--accent-green); }
.alert-error { background: rgba(245, 101, 101, 0.1); border: 1px solid var(--error); color: var(--error); }
.alert-info { background: rgba(108, 99, 255, 0.1); border: 1px solid var(--primary); color: var(--primary); }

/* ==================== Sélection de Module ==================== */
.modal-large { max-width: 650px; }

.quiz-type-grid {
    display: grid;
    grid-template-columns: repeat(2, 1fr);
    gap: 15px;
    margin-bottom: 20px;
}

.quiz-type-btn {
    display: flex;
    flex-direction: column;
    align-items: center;
    padding: 25px 15px;
    background: linear-gradient(135deg, #f8f9ff, #ffffff);
    border: 2px solid rgba(108, 99, 255, 0.1);
    border-radius: var(--radius-md);
    cursor: pointer;
    transition: var(--transition-fast);
    text-align: center;
}

.quiz-type-btn:hover {
    border-color: var(--primary);
    transform: translateY(-3px);
    box-shadow: var(--shadow-md);
}

.quiz-type-icon {
    font-size: 2.5rem;
    margin-bottom: 10px;
}

.quiz-type-name {
    font-weight: 600;
    font-size: 1.1rem;
    color: var(--text-dark);
    margin-bottom: 5px;
}

.quiz-type-desc {
    font-size: 0.85rem;
    color: var(--text-light);
}

.back-btn {
    display: inline-flex;
    align-items: center;
    gap: 6px;
    background: linear-gradient(135deg, #f0f0ff, #e8e8ff);
    border: 2px solid rgba(108, 99, 255, 0.2);
    color: var(--primary);
    cursor: pointer;
    font-size: 0.9rem;
    font-weight: 500;
    margin-bottom: 15px;
    padding: 8px 16px;
    border-radius: var(--radius-full);
    transition: var(--transition-fast);
}

.back-btn:hover {
    background: linear-gradient(135deg, var(--primary), var(--primary-light));
    color: white;
    border-color: var(--primary);
    transform: translateX(-3px);
}

.module-grid {
    display: grid;
    grid-template-columns: repeat(auto-fit, minmax(180px, 1fr));
    gap: 12px;
    margin-bottom: 15px;
}

.module-btn {
    display: flex;
    flex-direction: column;
    align-items: center;
    padding: 20px 15px;
    background: white;
    border: 2px solid rgba(0, 0, 0, 0.08);
    border-radius: var(--radius-md);
    cursor: pointer;
    transition: var(--transition-fast);
    text-align: center;
}

.module-btn:hover {
    border-color: var(--primary);
    background: linear-gradient(135deg, #f8f9ff, #ffffff);
    transform: scale(1.02);
}

.module-btn.nombres { border-left: 4px solid var(--primary); }
.module-btn.mesures { border-left: 4px solid var(--accent-orange); }
.module-btn.geometrie { border-left: 4px solid var(--accent-green); }

.module-icon {
    font-size: 2rem;
    margin-bottom: 8px;
}

.module-name {
    font-weight: 600;
    font-size: 0.95rem;
    color: var(--text-dark);
}

.submodule-grid {
    display: grid;
    grid-template-columns: 1fr;
    gap: 10px;
}

.submodule-btn {
    display: flex;
    align-items: center;
    gap: 12px;
    padding: 15px 20px;
    background: white;
    border: 2px solid rgba(0, 0, 0, 0.08);
    border-radius: var(--radius-md);
    cursor: pointer;
    transition: var(--transition-fast);
    text-align: left;
}

.submodule-btn:hover {
    border-color: var(--primary);
    background: linear-gradient(135deg, #f8f9ff, #ffffff);
}

.submodule-icon {
    font-size: 1.3rem;
    width: 40px;
    height: 40px;
    background: rgba(108, 99, 255, 0.1);
    border-radius: 50%;
    display: flex;
    align-items: center;
    justify-content: center;
}

.submodule-name {
    font-weight: 500;
    color: var(--text-dark);
}

@media (max-width: 480px) {
    .quiz-type-grid { grid-template-columns: 1fr; }
    .module-grid { grid-template-columns: 1fr; }
}

/* Profile Avatar Fix */
.profile-avatar {
    width: 120px !important;
    height: 120px !important;
    max-width: 120px !important;
    border-radius: 50%;
    object-fit: cover;
    margin: 0 auto 15px;
    display: block;
}

.profile-avatar-section {
    text-align: center;
    margin-bottom: 30px;
}

.avatar-grid {
    display: grid;
    grid-template-columns: repeat(5, 1fr);
    gap: 15px;
    margin-top: 15px;
}

.avatar-option {
    cursor: pointer;
    padding: 8px;
    border-radius: 12px;
    border: 3px solid transparent;
    transition: all 0.2s;
}

.avatar-option:hover {
    transform: scale(1.1);
    border-color: var(--primary-light);
}

.avatar-option.selected {
    border-color: var(--primary);
    background: rgba(108, 99, 255, 0.1);
}

.avatar-option img {
    width: 100%;
    height: auto;
    border-radius: 50%;
}