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

body {
    font-family: 'Segoe UI', Tahoma, Geneva, Verdana, sans-serif;
    overflow-x: hidden;
    min-height: 100vh;
}

/* Fond */
.background {
    position: fixed;
    top: 0;
    left: 0;
    width: 100%;
    height: 100%;
    z-index: -1;
    transition: background 0.5s ease;
    background: linear-gradient(135deg, #667eea 0%, #764ba2 100%);
}

/* Container principal */
.container {
    display: flex;
    flex-direction: column;
    align-items: center;
    justify-content: center;
    min-height: 100vh;
    padding: 80px 20px;
}

/* Typographie */
.title {
    font-size: 3.5rem;
    font-weight: bold;
    margin-bottom: 1rem;
    text-align: center;
    animation: fadeInDown 0.8s ease;
    text-shadow: 0 4px 6px rgba(0, 0, 0, 0.2);
    color: #f1f5f9;
}

.subtitle {
    font-size: 1.5rem;
    margin-bottom: 3rem;
    text-align: center;
    opacity: 0.9;
    animation: fadeInUp 0.8s ease;
    color: #f1f5f9;
}

.light-text {
    color: #f1f5f9;
}

.dark-text {
    color: #f1f5f9;
}

/* Groupes de boutons */
.button-group {
    display: flex;
    flex-direction: column;
    gap: 20px;
    width: 100%;
    max-width: 500px;
}

.button-group.centered {
    margin: 0 auto;
}

/* Boutons principaux */
.btn {
    background: rgba(255, 255, 255, 0.15);
    backdrop-filter: blur(10px);
    border: 1px solid rgba(255, 255, 255, 0.2);
    padding: 18px 50px;
    font-size: 1.2rem;
    font-weight: bold;
    border-radius: 15px;
    cursor: pointer;
    transition: all 0.3s ease;
    box-shadow: 0 8px 32px rgba(0, 0, 0, 0.1);
    text-align: center;
    text-decoration: none;
    display: flex;
    align-items: center;
    justify-content: center;
    gap: 15px;
    animation: fadeIn 0.5s ease;
    color: #f1f5f9;
}

.btn:hover {
    background: rgba(255, 255, 255, 0.25);
    transform: translateY(-5px);
    box-shadow: 0 12px 40px rgba(0, 0, 0, 0.2);
}

.btn:active {
    transform: translateY(-2px);
}

.btn-icon {
    font-size: 1.5rem;
}

.btn-text {
    flex: 1;
}

/* Bouton retour */
.back-btn {
    position: fixed;
    top: 30px;
    left: 30px;
    background: rgba(255, 255, 255, 0.2);
    backdrop-filter: blur(10px);
    border: 1px solid rgba(255, 255, 255, 0.3);
    padding: 12px 25px;
    border-radius: 10px;
    cursor: pointer;
    transition: all 0.3s ease;
    font-size: 1rem;
    font-weight: 600;
    text-decoration: none;
    display: inline-block;
    z-index: 1000;
    border: none;
    color: #f1f5f9;
}

.back-btn:hover {
    background: rgba(255, 255, 255, 0.3);
    transform: translateX(-5px);
}

/* État vide */
.empty-state {
    text-align: center;
    padding: 60px 20px;
    animation: fadeIn 0.8s ease;
}

.empty-icon {
    font-size: 5rem;
    margin-bottom: 20px;
    animation: bounce 2s infinite;
}

.empty-state h2 {
    font-size: 2rem;
    margin-bottom: 15px;
    color: #f1f5f9;
}

.empty-state p {
    font-size: 1.2rem;
    margin-bottom: 30px;
    opacity: 0.8;
    color: #f1f5f9;
}

/* Carte À propos */
.about-card {
    background: rgba(255, 255, 255, 0.15);
    backdrop-filter: blur(10px);
    border: 1px solid rgba(255, 255, 255, 0.2);
    padding: 40px;
    border-radius: 20px;
    max-width: 600px;
    margin: 20px;
    box-shadow: 0 8px 32px rgba(0, 0, 0, 0.1);
    animation: fadeIn 0.8s ease;
    color: #f1f5f9;
}

.about-card h2 {
    margin-bottom: 15px;
    font-size: 1.5rem;
    color: #f1f5f9;
}

.about-card p {
    line-height: 1.8;
    margin-bottom: 20px;
    color: #f1f5f9;
}

.about-card hr {
    border: none;
    border-top: 1px solid rgba(255, 255, 255, 0.3);
    margin: 30px 0;
}

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

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

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

@keyframes bounce {
    0%, 100% {
        transform: translateY(0);
    }
    50% {
        transform: translateY(-20px);
    }
}

/* Responsive */
@media (max-width: 768px) {
    .title {
        font-size: 2.5rem;
    }
    
    .subtitle {
        font-size: 1.2rem;
    }
    
    .btn {
        font-size: 1rem;
        padding: 15px 30px;
    }
    
    .back-btn {
        top: 15px;
        left: 15px;
        padding: 10px 15px;
        font-size: 0.9rem;
    }
}